CN202160325U - Self-excited oscillation invertion power supply with piecesiwe-variable output frequency - Google Patents
Self-excited oscillation invertion power supply with piecesiwe-variable output frequency Download PDFInfo
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- CN202160325U CN202160325U CN2011202529011U CN201120252901U CN202160325U CN 202160325 U CN202160325 U CN 202160325U CN 2011202529011 U CN2011202529011 U CN 2011202529011U CN 201120252901 U CN201120252901 U CN 201120252901U CN 202160325 U CN202160325 U CN 202160325U
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Abstract
The utility model discloses a self-excited oscillation power supply, which operates reliably, is low in cost and has a variable output frequency or output power. The power supply is provided with an inversion switch circuit, a coupling circuit composed of multiple current transformers, a switch and a load circuit, forming a self-excited oscillation invertion power supply circuit, the current transformers are formed by winding coils on magnetic cores, and the primary windings of the current transformers are serially connected or parallelly connected, and are connected with power switch tubes and a load circuit of the inversion switch circuit; each current transformer has two secondary windings, respectively serially connected or respectively parallelly connected with the base electrodes of the upper and lower power tubes of the inversion switch circuit; and the switch controls partial current of the coupling circuit composed of multiple current transformers to join or exit the self-excited oscillation, thus changing the self-excited oscillation frequency. The self-excited oscillation invertion power supply with a piecesiwe-variable output frequency is used for the self-excited oscillation electronic ballast of a gas discharge lamp, has a light modulation function and is relatively low in cost.
Description
Technical field
The utility model relates to the variable self-oscillation inverter of a kind of output frequency segmentation, refers to a kind of gaseous discharge lamp self-oscillation electric ballast inverter with dimming function especially.
Background technology
The self-oscillation inverter that direct current is transformed into interchange is widely used, and is common in especially in the electric ballast of gaseous discharge lamp self-oscillation cheaply.But the self-oscillation inverter circuit will realize that frequency of oscillation is adjustable or power output is adjustable, and is then relatively more difficult.
U.S. Pat 5596247 has proposed a kind of fairly simple self-oscillation electric ballast light modulation scheme, but the service time that this scheme will cause half-bridge to manage up and down is different, makes to manage up and down to be operated in asymmetrical state, and circuit reliability is brought influence.
Another U.S. Pat 6696803 has disclosed a kind of self-oscillation power source design of changed operating frequency of ability reliably working; But the fluctuation of accessory power supply voltage will influence its frequency of oscillation and power output in this scheme; Therefore the design to accessory power supply has proposed higher requirement, and cost is higher relatively.
China utility model patent CN91217582.6 proposes a kind of sectional dimming self-oscillation electric ballast of cheapness, and this scheme imagination is utilized the different taps of toggle switch short circuit vibration magnet ring, realizes sectional dimming.But in fact will reduce output voltage greatly behind the switch short circuit part winding, thereby can't guarantee the reliably working of circuit.
The utility model content
In order to overcome above-mentioned weak point, the main purpose of the utility model aims to provide a kind of ability reliably working and lower-cost output frequency or the variable self-oscillation power supply of power output.
The technical problem that the utility model will solve is: how to make the self-oscillation inverter circuit can be operated in different frequencies of oscillation, and can change operating frequency on request; When the load matched circuit forms non-pure resistive equivalent load,, just can change power output if circuit can change operating frequency.
The operation principle of common self-oscillation inverter circuit is to utilize a magnet ring as current transformer, inverter output current is coupled to the magnet ring secondary is used for the drive inverse switching tube,
Form self-oscillation.When the parameter of other parts of circuit is confirmed, inverter output current will produce different self-oscillation frequencies to the difference of magnet ring secondary coupled relation, and for example the saturation depth difference of magnet ring can cause the self-oscillation frequency different.
Based on above principle, the purpose of the utility model is achieved in that
This power supply is provided with coupling circuit, switch and the load circuit of inverse switch circuit, a plurality of current transformer composition; Constitute the self-oscillation inverter power circuit, control the part current transformer participation in the coupling circuit that a plurality of current transformers form or withdraw from self-oscillation by switch and change the self-oscillation frequency.
The coupling circuit that said a plurality of current transformer is formed comprises at least two coupling coefficients current transformer independently mutually.
The said a plurality of current transformers that in circuit, are provided with are on magnetic core, to be wound with coil, and the former limit winding of instrument transformer is connected each other, respectively with the inverse switch circuit in power switch pipe be connected with load circuit; Each instrument transformer has two secondary windings; After the secondary windings in series of a secondary winding of one of them instrument transformer and another instrument transformer; Be connected with emitter with the base stage of the last power switch pipe of inverse switch circuit through driving resistor, in addition two secondary windings in series after under driving resistor and the inverse switch circuit base stage of power switch pipe be connected with emitter, by a switch; Control at least one current transformer participation or withdraw from self-oscillation, with the frequency of oscillation of control circuit.
Said switch is connected to the former limit winding of coil in the current transformer; Perhaps be connected at least one secondary winding of a current transformer.
In any current transformer, be wound with secondary control winding again, this secondary control winding is by a switch and connect.
A said secondary control winding switch of serial connection or a resistance, or a DC power supply.
The said a plurality of current transformers that in circuit, are provided with are on magnetic core, to be wound with coil, and the former limit winding of instrument transformer is connected each other, is connected with load circuit with the power switch pipe of inverse switch circuit respectively; Each instrument transformer has two secondary windings, and the secondary winding of selecting to connect one or more current transformers by switch control is connected in series with the base stage of the upper and lower power switch pipe of inverse switch circuit respectively.
The said a plurality of current transformers that in circuit, are provided with are on magnetic core, to be wound with coil, and the former limit winding of instrument transformer is parallel with one another, select the former limit of one of them instrument transformer to be connected with load circuit with the power switch pipe of inverse switch circuit by switch control; Each instrument transformer has two secondary windings; Be connected in series with the base stage of the upper and lower power switch pipe of inverse switch circuit respectively after the series connection respectively; Perhaps parallel connection respectively selects the secondary winding of the one or more current transformers of connection and the base stage of the upper and lower power switch pipe of inverse switch circuit to be connected in series by switch control.
Stating switch is mechanical switch or electronic switch.
The self-oscillation inverter power circuit places certain to confirm the position by the control command control switch, to reach a definite frequency at electrifying startup or when receiving external starting command.
The said self-oscillation power supply of such scheme be input as direct current input, can be from prime rectification or pfc circuit, or from external dc power.After the inverse switch circuit obtains the direct current input; Produce or external circuit generation starting of oscillation trigger impulse by inverse switch inside circuit starting of oscillation circuit; The inverse switch circuit is started working; With the coupling circuit of at least one current transformer composition of direct current input being transformed into interchange output and the series loop of load circuit formation; The alternating current of the coupling circuit self-converse power transformation road output that wherein a plurality of current transformers are formed produces coupling output and is connected to the inverse switch circuit, is used for the power switch pipe of drive inverse switching circuit, produces self-oscillation.When external control order control switch; Part current transformer in the coupling circuit that a plurality of current transformers form is participated in or when withdrawing from self-oscillation; The current oscillation frequency that circuit self-oscillation frequency shift, inverse switch circuit export load circuit to promptly changes.
After such scheme was applied in the electronic amperite of gas-discharge lamp, because of load circuit is non-pure resistive, the controlled change of frequency of oscillation can cause the controlled change of power output, reaches dimming effect.
The beneficial effect of the utility model is: the utility model provides a kind of output frequency or the variable self-oscillation power supply of power output of ability reliably working, or has the gaseous discharge lamp self-oscillation electric ballast of dimming function, and cost is relatively low.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is further specified.
Accompanying drawing 1 is the block diagram of the general structure of the utility model;
Accompanying drawing 2 is embodiment sketch mapes of the utility model;
Accompanying drawing 3 is another embodiment sketch mapes of the utility model;
Accompanying drawing 4 is another embodiment sketch mapes of the utility model;
Accompanying drawing 5 is another embodiment sketch mapes of the utility model;
Accompanying drawing 6 is another embodiment sketch mapes of the utility model;
Accompanying drawing 7 is another embodiment sketch mapes of the utility model;
Accompanying drawing 8 is physical circuit figure that the utility model is used for an embodiment of electric ballast;
Accompanying drawing 9 is sketch mapes of a kind of start-up course of the utility model;
Label declaration in the accompanying drawing:
101-inverse switch circuit;
The coupling circuit of 102-a plurality of current transformers compositions;
103-load circuit; 104-switch;
201-go up and manage; 202-down pipes;
203-load matched circuit; 204-control circuit; 205-electric control switch;
The former limit of 206a-magnet ring; Pipe drives secondary on 206b-magnet ring;
206c-magnet ring pipe down drives secondary;
The former limit of 207a-magnet ring; Pipe drives secondary on 207b-magnet ring;
207c-magnet ring pipe down drives secondary;
208-on manage driving resistor; 209-down pipe driving resistor;
On 210-capacitance; Under 211-capacitance;
301-go up and manage; 302-down pipes; 303-load matched circuit; 304-control circuit; 305-double-pole electric control switch;
The former limit of 306a-magnet ring; Pipe drives secondary on 306b-magnet ring;
306c-magnet ring pipe down drives secondary;
The former limit of 307a-magnet ring; Pipe drives secondary on 307b-magnet ring;
307c-magnet ring pipe down drives secondary;
308-on manage driving resistor; 309-down pipe driving resistor;
On 310-capacitance; Under 311-capacitance;
401-go up and manage; 402-down pipes;
403-load matched circuit; On 404-capacitance; Under 405-capacitance;
The former limit of 406a-magnet ring; Pipe drives secondary on 406b-magnet ring;
406c-magnet ring pipe down drives secondary;
The former limit of 407a-magnet ring; Pipe drives secondary on 407b-magnet ring;
407c-magnet ring pipe down drives secondary; 407d-magnet ring control winding;
408-on manage driving resistor; 409-down pipe driving resistor;
410-control switch;
501-go up and manage; 502-down pipes;
503-load matched circuit; 504-control circuit;
Tube portion on 505a-linked switch; Tube portion under 505b-linked switch;
The former limit of 506a-magnet ring; Pipe drives secondary on 506b-magnet ring;
506c-magnet ring pipe down drives secondary;
The former limit of 507a-magnet ring; Pipe drives secondary on 507b-magnet ring;
507c-magnet ring pipe down drives secondary;
508-on manage driving resistor; 509-down pipe driving resistor;
On 510-capacitance; Under 511-capacitance;
601-go up and manage; 602-down pipes;
603-load matched circuit; 604-control circuit;
Tube portion on 605a-linked switch; Tube portion under 605b-linked switch;
605c-former the limit of linked switch magnet ring part;
The former limit of 606a-magnet ring; Pipe drives secondary on 606b-magnet ring;
606c-magnet ring pipe down drives secondary;
The former limit of 607a-magnet ring; Pipe drives secondary on 607b-magnet ring;
607c-magnet ring pipe down drives secondary;
608-on manage driving resistor; 609-down pipe driving resistor;
On 610-capacitance; Under 611-capacitance;
701-go up and manage; 702-down pipes;
703-load matched circuit; 704-control circuit;
705-on-off switch;
The former limit of 706a-magnet ring; Pipe drives secondary on 706b-magnet ring;
706c-magnet ring pipe down drives secondary;
The former limit of 707a-magnet ring; Pipe drives secondary on 707b-magnet ring;
707c-magnet ring pipe down drives secondary;
708-on manage driving resistor; 709-down pipe driving resistor;
On 710-capacitance; Under 711-capacitance;
D1-rectification circuit or pfc circuit;
R1-starting of oscillation charging resistor; C1-starting of oscillation electric capacity; D2-bidirectional trigger diode;
D3-diode; Manage driving resistor on R2-half-bridge; R3-half-bridge is the pipe driving resistor down;
Manage on Q1-half-bridge; Q2-half-bridge is pipe down; T1a-former the limit of vibration magnet ring T1;
T1b-vibration magnet ring T1 goes up pipe and drives secondary; T1c-vibration magnet ring T1 pipe down drives secondary;
T2a-former the limit of vibration magnet ring T2; T2b-vibration magnet ring T2 goes up pipe and drives secondary;
T2c-vibration magnet ring T2 pipe down drives secondary; T2d-vibration magnet ring T2 controls winding;
S1-control switch; VDC-auxiliary direct current voltage source; R4-auxiliary resistance;
Lr-resonant inductance; TL-fluorescent lamp; Cr-resonant capacitance;
On C2-capacitance; Under C3-capacitance;
901-electrifying startup or receive enabled instruction;
902-put switch in producing the position that starts frequency;
903-start and accomplish?
904-by control command, put switch in the position that produces required frequency.
Embodiment
See also shown in the accompanying drawing 1; The coupling circuit (102) that the variable self-oscillation power supply of the output frequency segmentation of the utility model is made up of inverse switch circuit (101), a plurality of current transformer, load circuit (103) and switch (104) constitute; Wherein the output of inverse switch circuit (101) is connected to the coupling circuit (102) of a plurality of current transformers compositions and the series loop that load circuit (103) is formed, and coupling circuit (102) output that a plurality of current transformers are formed is connected to the driving of inverse switch circuit (101) as inverse switch circuit (101).
External control order controllable switch (104) is wherein participated in part instrument transformer in the coupling circuit (102) that a plurality of current transformers form or is withdrawed from self-oscillation, changes the self-oscillation frequency.The coupling circuit (102) that described a plurality of current transformer is formed is made up of two separate current transformers of coupling coefficient at least.
When some loads on electrifying startup frequency or the power of transporting to load there is particular requirement; Have only satisfactory frequency or power proof load normally to start; When connecting this type load; The self-oscillation power supply that output frequency shown in the accompanying drawing 1 or power output are variable can be according to the load starting characteristic to starting the requirement of frequency, and the frequency that is provided with when certain several specific instrument transformer is participated in vibration in the coupling circuit (102) that a plurality of current transformers form is this startup frequency; Then according to accompanying drawing 9 described methods, when said self-oscillation power supply electrifying starts or external command when giving enabled instruction, make the above-mentioned specific instrument transformer of switch (104) control participate in vibration, should start frequency of oscillation thereby produce.Start completion until load,, put switch (104) in the position that produces required frequency again according to the requirement of control command.
Inverse switch circuit (101) be input as direct current input, can be from prime rectification or pfc circuit, or from external dc power.After inverse switch circuit (101) obtains the direct current input; Produce the starting of oscillation trigger impulse by inner starting of oscillation circuit of inverse switch circuit (101) or external circuit; Inverse switch circuit (101) is started working; Export direct current input being transformed into interchange to the coupling circuit (102) of a plurality of current transformers compositions and the series loop that load circuit (103) constitutes; The coupling circuit (102) that wherein a plurality of current transformers are formed is connected to inverse switch circuit (101) from the alternating current generation coupling output of inversion switching circuit (101) output, is used for drive inverse switching circuit (101), produces self-oscillation.When external control order control switch (104); Part instrument transformer in the coupling circuit (102) that a plurality of current transformers form is participated in or when withdrawing from self-oscillation, the current oscillation frequency that inverse switch circuit (101) exports load circuit (103) to promptly changes; When load circuit (103) is non-pure when resistive, the power that the change of current oscillation frequency causes transporting to load circuit (103) changes.
Accompanying drawing 2 is embodiment sketch mapes of the utility model.(211) composition half-bridge inversion circuit under (210) and the capacitance on last pipe (201), following pipe (202), the capacitance; Last pipe (201) is connected mid point to be exported and is connected to the former limit of magnet ring (206a), the former limit of magnet ring (207a) and load matched circuit (203) successively with following pipe (202), on load matched circuit (203) other end and the capacitance under (210) and the capacitance tie point of (211) link to each other; Be provided with two magnet rings in the circuit; On the former limit of magnet ring (207a), the magnet ring pipe drive secondary (207b) and magnet ring down pipe to drive secondary (207c) be the different windings of same magnet ring, to drive and manage driving secondary (206c) under secondary (206b) and the magnet ring be the different windings of another magnet ring to pipe on the former limit of magnet ring (206a), the magnet ring; Pipe drives pipe on secondary (206b) and the magnet ring and drives the drive circuit that secondary (207b) and last pipe driving resistor (208) are composed in series pipe (201) on the magnet ring; Magnet ring is managed down to drive to manage under secondary (206c), the magnet ring and is driven secondary (207c) and manage the drive circuit that driving resistor (209) is composed in series down pipe (202) down.After pipe (202) is opened down in external starting of oscillation pulse, the half-bridge starting of oscillation.Control circuit (204) makes electric control switch (205) closed or open according to the requirement of external control command output control signal; When electric control switch (205) when opening; Load current flow through former limit of magnet ring (206a) and the former limit of magnet ring (207a); After the two groups of secondary outputs separately of these two magnet rings superposeed respectively, driving was upward managed (201) and is managed (202) down, the self-oscillation frequency that formation one is fixed respectively; When electric control switch (205) is closed; The former limit of magnet ring (207a) is by short circuit; The load current former limit of magnet ring (206a) of only flowing through; On the magnet ring pipe drive secondary (207b) and magnet ring down pipe to drive secondary (207c) output voltage all be zero, have only on the magnet ring pipe drive secondary (206b) and magnet ring down pipe drive secondary (206c) and drive pipe (201) and following manage (202) respectively, form the self-oscillation frequency that another is fixed.Therefore, control circuit (204) makes electric control switch (205) closed or open according to the requirement of external control command, can change the self-oscillation frequency, or change the power through load matched circuit (203) output.
Accompanying drawing 3 is sketch mapes of another embodiment of the utility model, and is basic identical with the operation principle of accompanying drawing 2 illustrated embodiments, and just control switch makes double-pole electric control switch (305) and control vibration magnet ring secondary into; When control circuit (304) was controlled double-pole electric control switch (305) closure, pipe drove and manages driving secondary (307c) under secondary (307b) and the magnet ring respectively by short circuit on the magnet ring, withdraws from vibration, and the self-oscillation frequency is only by another magnet ring decision; When double-pole electric control switch (305) was opened a way, two magnet rings were all participated in vibration, form another frequency of oscillation.
Accompanying drawing 4 is sketch mapes of another embodiment of the utility model; Last pipe (401) and following pipe (402) are formed the inversion half-bridge; Output is connected to the former limit of magnet ring (406a), the former limit of magnet ring (407a) and load matched circuit (403) successively, is connected to that under (404) and capacitance the tie point place of (405) on the capacitance again; On the capacitance under (404) and the capacitance (405) be connected in series, its two ends and direct current input two ends are connected; Be provided with two magnet rings in the circuit; On the former limit of magnet ring (407a), the magnet ring pipe drive secondary (407b), magnet ring down pipe to drive secondary (407c) be the different windings of same magnet ring with magnet ring control winding (407d), to drive and manage driving secondary (406c) under secondary (406b) and the magnet ring be the different windings of another magnet ring to pipe on the former limit of magnet ring (406a), the magnet ring; Manage driving secondary (407b) on the magnet ring on pipe driving secondary (406b), the magnet ring and be connected with emitter with the base stage of last pipe (401), manage the drive circuit of (401) on the composition with last pipe driving resistor (408) series connection back; Pipe driving secondary (406c), magnet ring are connected with emitter with the base stage of following pipe (402) after managing driving secondary (407c) down and managing driving resistor (409) series connection down under the magnet ring, and composition is managed the drive circuit of (402) down; Control switch (410) is controlled winding (407d) with magnet ring and is connect.After pipe (402) is opened down in external starting of oscillation pulse, the half-bridge starting of oscillation.When the control switch (410) is opened, two self-oscillating magnetic participate to form a fixed oscillation frequency; When the control switch (410) is closed, the secondary ring on the tube driver (407b) and the lower tube ring secondary drive (407c) are the output voltage to zero and exit Clamp on oscillating magnetic self-excited oscillation determined by another, to form another fixed oscillation frequency, to achieve the output frequency changes.If it is non-pure resistive that load matched circuit (403) is matched to external loading, then the controlled change of frequency of oscillation causes the controlled change of power output, reaches the utility model purpose.
Accompanying drawing 5 is sketch mapes of another embodiment of the utility model; Last pipe (501) and following pipe (502) are formed half-bridge inversion circuit; Output is connected to the former limit of magnet ring (506a), the former limit of magnet ring (507a) and load matched circuit (503) successively, is connected to that under (510) and capacitance the junction of (511) on the capacitance again; Two termination direct currents input after (511) are connected in series under (510) and the capacitance on the capacitance; Be provided with two magnet rings in the circuit; On the former limit of magnet ring (507a), the magnet ring pipe drive secondary (507b) and magnet ring down pipe to drive secondary (507c) be the different windings of same magnet ring, to drive and manage driving secondary (506c) under secondary (506b) and the magnet ring be the different windings of another magnet ring to pipe on the former limit of magnet ring (506a), the magnet ring; Pipe drives base stage and the emitter that is connected to pipe (501) after pipe driving secondary (507b) is selected one of them and last pipe driving resistor (508) is connected by tube portion on the linked switch (505a) on secondary (506b) or the magnet ring on the magnet ring; Magnet ring is managed down to drive to manage under secondary (506c) or the magnet ring and is driven base stage and the emitter that is connected to down pipe (502) after secondary (507c) selects one of them and following pipe driving resistor (509) to connect by tube portion under the linked switch (505b); The coupling coefficient that two magnet rings are set is different; The frequency of oscillation that forms when making the independent place in circuit of each magnet ring is different, on its middle magnetic ring pipe drive secondary (506b) and magnet ring down the frequency of oscillation during pipe driving secondary (506c) place in circuit meet the requirement of load starting characteristic.When initially powering on, control circuit (504) is always controlled linked switch makes on the magnet ring pipe drive secondary (506b) and magnet ring pipe driving secondary (506c) place in circuit down, and the proof load starting characteristic is met; External starting of oscillation pulse makes the starting of oscillation of inversion half-bridge, and circuit is pressed and managed the startup frequency that drives pipe driving secondary (506c) place in circuit formation under secondary (506b) and the magnet ring on the magnet ring.After load starts; Control circuit (504) can make that tube portion (505b) switches under tube portion on the linked switch (505a) and the linked switch according to the requirement of external control order between the secondary of two magnet rings; Make to manage on the magnet ring and drive pipe driving secondary (506c) place in circuit under secondary (506b) and the magnet ring; Or make on the magnet ring pipe drive secondary (507b) and magnet ring down pipe drive secondary (507c) place in circuit, thereby circuit is switched between two different frequencies of oscillation, when the non-pure resistive equivalent load of load matched circuit (503) formation; The change of output frequency causes the change of power output, reaches the utility model purpose.
Accompanying drawing 6 is sketch mapes of another embodiment of the utility model, and is similar basically with the operation principle of accompanying drawing 5 illustrated embodiments, and just place in circuit is also selected by the former limit of linked switch magnet ring part (605c) in the former limit of two magnet rings; The coupling coefficient that two magnet rings are set is different, and the frequency of oscillation that forms when making the independent place in circuit of each magnet ring is different.When control circuit (604) switches between two magnet rings according to the requirement control linked switch of external control order,, reach the utility model purpose between two different frequencies of oscillation with circuit is switched.
Accompanying drawing 7 is sketch mapes of another embodiment of the utility model, and is similar basically with the operation principle of accompanying drawing 5 illustrated embodiments, and just place in circuit is selected by on-off switch (705) in the former limit of two magnet rings, and makes the secondary of two magnet rings into series connection; The coupling coefficient that two magnet rings are set is different, and the frequency of oscillation that forms when making the independent place in circuit of each magnet ring is different.When control circuit (704) switched between two magnet rings according to the requirement control on-off switch (705) of external control order, the secondary output voltage of the magnet ring that former limit is not inserted was zero, and frequency of oscillation is by the magnet ring decision of place in circuit; Therefore, between two magnet rings, switch,, reach the utility model purpose between two different frequencies of oscillation even circuit switches.
Figure 8 is a utility for electronic ballast concrete circuit diagram of an embodiment of the rectifier circuit or the output of the PFC circuit is connected to a half bridge D1 Q1 and Q2 form a half bridge inverter half bridge tube; onset charging resistor R1, start-up capacitor C1 and bidirectional trigger diode D2, start-up circuit, the diode D3 in the circuit start-up after start-up capacitor C1 Clamp on at a low level; half-bridge transistors Q1 and Q2 is composed of half-bridge oscillating half-bridge inverter output in order to connect the primary side toroid T1 T1a, oscillating magnetic T2 primary T2a?, resonant inductor Lr, fluorescent TL filament, resonant capacitor Cr, through the other side of the filament fluorescent TL received a blocking capacitor the blocking capacitor C2 and C3 is connected under the midpoint; circuit is provided with two magnetic ring, magnetic oscillation T1 primary T1a, oscillating magnetic tube drive on the secondary side of T1 and oscillatory magnetic T1b T1 secondary side down tube driver T1c different for the same toroid winding, oscillating magnetic T2 primary T2a, oscillating magnetic tube drive on the secondary side of T2 T2b, oscillating magnetic drive down tube T2 secondary T2c and oscillation control winding T2d T2 ring for another magnetic Different ring winding; oscillating magnetic tube drive on the secondary side of T1 T1b, T2 oscillating magnetic tube drive on the secondary side of the bridge T2b and semi-tube drive resistor R2 in series with the half bridge transistor Q1 base and emitter connections; oscillating magnetic drive down tube T1 secondary T1c, T2 oscillating magnetic drive down tube and semi-bridge secondary T2c tube drive resistor R3 in series with the half bridge transistor Q2's base and emitter connected; blocking capacitor C2 and the DC-blocking capacitor C3 connected in series across the rectifier circuit or the output of the PFC circuit D1; auxiliary DC voltage supply VDC, auxiliary resistor R4, the control switch S1 in series with the control winding T2 ring oscillator connected to both ends T2d; set auxiliary DC voltage supply voltage VDC via the auxiliary resistor R4 is sufficient the oscillation saturated ring T2 values or set auxiliary DC voltage supply VDC voltage value of zero and a resistor R4 is set to the appropriate value assist the auxiliary resistor R4 and the oscillation toroid winding T2d T2 control is switched on, oscillating magnetic tube drive on the secondary side T2 T2b and oscillating magnetic drive down tube T2 secondary side T2c output is Clamp on to zero.
During initial condition, put control switch S1 open circuit.After the alternating current of appropriate voltage inputs to rectification circuit or pfc circuit D1; Rectification circuit or pfc circuit D1 will exchange input and change direct current output into; To 1 charging of starting of oscillation capacitor C, voltage raises gradually and punctures until bidirectional trigger diode D2 on the starting of oscillation capacitor C 1 through starting of oscillation charging resistor R1, and starting of oscillation capacitor C 1 is through bidirectional trigger diode D2 and half-bridge pipe driving resistor R3 pipe Q2 base stage discharge under half-bridge down; Half-bridge is pipe Q2 conducting down, the circuit starting of oscillation; Because of control switch S1 open circuit; Two magnet rings are all participated in vibration; Circuit vibrates with a fixed frequency; Pipe Q1 and half-bridge the flow through filament of resonant inductance Lr, resonant capacitance Cr and fluorescent lamp TL of the inversion half-bridge output current formed of pipe Q2 down produces high voltage and finally causes fluorescent lamp TL puncture on the half-bridge at resonant capacitance Cr two ends, and fluorescent lamp TL lights.When dimming, position control switch S1 is closed, if the auxiliary DC voltage source VDC voltage value is set to a high enough value, the flow through the auxiliary resistor R4 and oscillation control winding T2d T2 magnetic currents so that the magnetic saturation exit the oscillation, the oscillation frequency is changed by another magnetic self-excited oscillation frequency is determined; position control switch S1 is closed, if the auxiliary DC voltage supply VDC voltage value is set to zero and the secondary resistor R4 is set to an appropriate value, so that oscillating magnetic tube drive on the secondary side of T2 T2b and oscillating magnetic T2 secondary side down tube driver's output is Clamp on T2c to zero and exit oscillation, the oscillation frequency is changed by the decision of another magnetic self-excited oscillation frequency; Because fluorescent TL has breakdown, half-bridge inverter output current part of the flow through the resonant inductor Lr fluorescent TL, self-excited oscillation frequency change in the resonant inductor Lr flowing currents and fluorescent TL changed, so that the power output to the fluorescent TL occurrence change, to achieve dimming effect.
Accompanying drawing 9 is a kind of sketch mapes that start method of the utility model.When the load that is connected when the variable self-oscillation power supply of the described frequency segmentation of the utility model has particular requirement to starting frequency; The power supply of the utility model can be according to load to starting the requirement of frequency, and the frequency that is provided with when certain several specific instrument transformer is participated in vibration in the coupling circuit (102) that a plurality of current transformers form is this startup frequency.The power supply of the utility model can progressively be accomplished startup according to accompanying drawing 9 described methods then: at step (901) electrifying startup or when receiving enabled instruction; Promptly get into step (902) and put switch in producing the position that starts frequency; Make switch control above-mentioned specific instrument transformer and participate in vibration, should start frequency thereby produce.(903) judge whether to start and accomplish then set by step, if do not accomplish the maintained switch invariant position; Accomplish if start, then get into step (904), put switch in the position that produces required frequency by control command.But this method Artificial Control is accomplished, and also can be accomplished by the control circuit that is provided with in the utility model power supply.
Claims (10)
1. self-oscillation inverter that the output frequency segmentation is variable; It is characterized in that; This power supply is provided with coupling circuit, switch and the load circuit of inverse switch circuit, a plurality of current transformer composition; Constitute the self-oscillation inverter power circuit, control the part current transformer participation in the coupling circuit that a plurality of current transformers form or withdraw from self-oscillation by switch and change the self-oscillation frequency.
2. by the variable self-oscillation inverter of the said output frequency segmentation of claim 1, it is characterized in that the coupling circuit that said a plurality of current transformers are formed comprises at least two coupling coefficients current transformer independently mutually.
3. by the variable self-oscillation inverter of the said output frequency segmentation of claim 1; It is characterized in that; The said a plurality of current transformers that in circuit, are provided with; Be on magnetic core, to be wound with coil, the former limit winding of instrument transformer is connected each other, respectively with the inverse switch circuit in power switch pipe be connected with load circuit; Each instrument transformer has two secondary windings; After the secondary windings in series of a secondary winding of one of them instrument transformer and another instrument transformer; Be connected with emitter with the base stage of the last power switch pipe of inverse switch circuit through driving resistor, in addition two secondary windings in series after under driving resistor and the inverse switch circuit base stage of power switch pipe be connected with emitter, by a switch; Control at least one current transformer participation or withdraw from self-oscillation, with the frequency of oscillation of control circuit.
4. by the variable self-oscillation inverter of the described output frequency segmentation of claim 3, it is characterized in that said switch is connected to the former limit winding of coil in the current transformer; Perhaps be connected at least one secondary winding of a current transformer.
5. by the variable self-oscillation inverter of the described output frequency segmentation of claim 3, it is characterized in that, in any current transformer, be wound with a secondary control winding again, this secondary control winding is by a switch and connect.
6. by the variable self-oscillation inverter of the described output frequency segmentation of claim 5, it is characterized in that a said secondary control winding switch of serial connection or a resistance, or a DC power supply.
7. by the variable self-oscillation inverter of the described output frequency segmentation of claim 1; It is characterized in that; The said a plurality of current transformers that in circuit, are provided with; Be on magnetic core, to be wound with coil, the former limit winding of instrument transformer is connected each other, is connected with load circuit with the power switch pipe of inverse switch circuit respectively; Each instrument transformer has two secondary windings, and the secondary winding of selecting to connect one or more current transformers by switch control is connected in series with the base stage of the upper and lower power switch pipe of inverse switch circuit respectively.
8. by the variable self-oscillation inverter of the described output frequency segmentation of claim 1; It is characterized in that; The said a plurality of current transformers that in circuit, are provided with; Be on magnetic core, to be wound with coil, the former limit winding of instrument transformer is parallel with one another, selects the former limit of one of them instrument transformer to be connected with load circuit with the power switch pipe of inverse switch circuit by switch control; Each instrument transformer has two secondary windings; Be connected in series with the base stage of the upper and lower power switch pipe of inverse switch circuit respectively after the series connection respectively; Perhaps parallel connection respectively selects the secondary winding of the one or more current transformers of connection and the base stage of the upper and lower power switch pipe of inverse switch circuit to be connected in series by switch control.
9. by the variable self-oscillation inverter of the described output frequency segmentation of claim 1, it is characterized in that said switch is mechanical switch or electronic switch.
10. by the variable self-oscillation inverter of the described output frequency segmentation of claim 1; It is characterized in that; The self-oscillation inverter power circuit places certain to confirm the position by the control command control switch, to reach a definite frequency at electrifying startup or when receiving external starting command.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202529011U CN202160325U (en) | 2011-07-18 | 2011-07-18 | Self-excited oscillation invertion power supply with piecesiwe-variable output frequency |
| PCT/CN2012/078653 WO2013010459A1 (en) | 2011-07-18 | 2012-07-13 | Self-oscillating inverter power supply having variable output frequency slicing and power supply having variable output current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202529011U CN202160325U (en) | 2011-07-18 | 2011-07-18 | Self-excited oscillation invertion power supply with piecesiwe-variable output frequency |
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| Publication Number | Publication Date |
|---|---|
| CN202160325U true CN202160325U (en) | 2012-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202529011U Expired - Fee Related CN202160325U (en) | 2011-07-18 | 2011-07-18 | Self-excited oscillation invertion power supply with piecesiwe-variable output frequency |
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| CN (1) | CN202160325U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102316658A (en) * | 2011-07-18 | 2012-01-11 | 晴飞照明电器（上海）有限公司 | Self-excited oscillation inversion power supply with variable output frequency segment |
| WO2013010459A1 (en) * | 2011-07-18 | 2013-01-24 | 张曦春 | Self-oscillating inverter power supply having variable output frequency slicing and power supply having variable output current |
-
2011
- 2011-07-18 CN CN2011202529011U patent/CN202160325U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102316658A (en) * | 2011-07-18 | 2012-01-11 | 晴飞照明电器（上海）有限公司 | Self-excited oscillation inversion power supply with variable output frequency segment |
| WO2013010459A1 (en) * | 2011-07-18 | 2013-01-24 | 张曦春 | Self-oscillating inverter power supply having variable output frequency slicing and power supply having variable output current |
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