CN102684487A - BJT type self-excited Sepic converter equipped with main switching tube with low drive loss - Google Patents
BJT type self-excited Sepic converter equipped with main switching tube with low drive loss Download PDFInfo
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Abstract
A BJT (Bipolar Junction Transistor) type self-excited Sepic converter equipped with a main switching tube with low drive loss comprises the main circuit of a Sepic converter, which is composed of an input capacitor Ci, an inductor L1, an NPN type BJT transistor Q1, a capacitor C, an inductor L2, a diode D1, a diode D and a capacitor Co, and further comprises a drive unit of the main switching tube Q1. The drive unit of the main switching tube Q1 is composed of a resistor R1, a resistor R2, a voltage stabilizing tube Z1 and a PNP type BJT transistor Q2; the emitter of the PNP type BJT transistor Q2 is connected to one end of the resistor R1; the other end of the resistor R1 is connected to one end of the inductor L1 and the positive end of a direct-current voltage source Vi; the base of the PNP type BJT transistor Q2 is connected to the anode of the voltage stabilizing tube Z1 and one end of the resistor R2; the cathode of the voltage stabilizing tube Z1 is connected to the other end of the inductor L1 and one end of the capacitor C; the other end of the resistor R2 is connected to the negative end of the direct-current voltage source Vi; and the collector of the PNP type BJT transistor Q2 is connected to the base of the NPN type BJT transistor Q1. In order to improve the dynamic performance of the circuit, a capacitor C1 can be connected in parallel between the positive end of the direct-current voltage source Vi and the base of the PNP type BJT transistor Q2. The BJT type self-excited Sepic converter is simple in structure, low in element quantity, and high in circuit efficiency under light load; moreover, the drive loss of the main switching tube is low.
Description
Technical field
The present invention relates to autonomous DC-DC (DC-DC) converter, be applied to switch voltage-stabilizing or stabilized current power supply, high-brightness LED drive circuit etc., especially a kind of auto-excitation type Sepic converter.
Background technology
Compare with separated exciting DC-DC converter with linear (voltage stabilizing or current stabilization) adjuster, auto-excitation type DC-DC converter has the high remarkable advantage of cost performance.What Fig. 1 provided is BJT (bipolar transistor) the type auto-excitation type Sepic converter that a kind of circuit structure is simple, the components and parts number is few; The major loop that comprises the Sepic converter of forming by input capacitance Ci, inductance L 1, diode D1, NPN type BJT pipe Q1, capacitor C, inductance L 2, diode D and output capacitance Co; Input capacitance Ci is parallelly connected with direct voltage source Vi; Output capacitance Co voltage is VD Vo, and load Ro is parallelly connected with output capacitance Co, and the negative terminal of direct voltage source Vi links to each other with the negative terminal of VD Vo, the emitter of NPN type BJT pipe Q1; The anode of direct voltage source Vi links to each other with an end of inductance L 1; The other end of inductance L 1 links to each other with the anode of diode D1, and the negative electrode of diode D1 links to each other with the collector electrode of NPN type BJT pipe Q1 and an end of capacitor C, and the other end of capacitor C links to each other with the anode of diode D and an end of inductance L 2; The other end of inductance L 2 links to each other with the negative terminal of direct voltage source Vi, and the negative electrode of diode D links to each other with the anode of output voltage V o.
BJT type auto-excitation type Sepic converter shown in Figure 1 also comprises the driver element of main switch Q1; The driver element of said main switch Q1 is made up of resistance R 1, resistance R 2, resistance R 3, capacitor C 1 and NPN type BJT pipe Q2; The collector and emitter of said NPN type BJT Q2 links to each other with emitter with the base stage of NPN type BJT pipe Q1 respectively; The base stage of NPN type BJT pipe Q1 also is connected to the anode of direct voltage source Vi through resistance R 1; Resistance R 3 is formed parallel branch with capacitor C 1; One end of said parallel branch links to each other with the anode of an end of inductance L 1 and diode D1, and the other end of said parallel branch links to each other with the base stage of NPN type BJT pipe Q2 and an end of resistance R 2, and the other end of resistance R 2 links to each other with the emitter of NPN type BJT pipe Q2.BJT type auto-excitation type Sepic converter shown in Figure 1 also comprises the Voltage Feedback branch road; Said Voltage Feedback is propped up route resistance R 4, resistance R 5, voltage-stabiliser tube Z1 and NPN type BJT pipe Q3 and is formed; The negative electrode of said voltage-stabiliser tube Z1 links to each other with the anode of VD Vo; The anode of voltage-stabiliser tube Z1 links to each other with an end of resistance R 5 and the base stage of NPN type BJ pipe Q3; The collector electrode of NPN type BJT pipe Q3 links to each other through the base stage of resistance R 4 with NPN type BJT pipe Q1, and the emitter of NPN type BJT pipe Q3 and the other end of resistance R 5 are connected to the negative terminal of direct voltage source Vi.The weak point of this circuit is: the driver element of the main switch Q1 that is made up of driving resistor R1, NPN type BJT pipe Q2, resistance R 2, resistance R 3 and capacitor C 1;, main switch Q1 still have big electric current to flow through driving resistor R1 when turn-offing; Cause the drive loss of Q1 bigger; Thereby influence the efficient of circuit, especially the light-load efficiency of circuit.
Summary of the invention
For overcoming the bigger deficiency of existing BJT type auto-excitation type Sepic converter main switch drive loss, the present invention provides a kind of main switch drive loss little BJT type auto-excitation type Sepic converter.
The technical solution adopted for the present invention to solve the technical problems is: the BJT type auto-excitation type Sepic converter that a kind of main switch drive loss is little comprises the major loop of the Sepic converter of being made up of input capacitance Ci, inductance L 1, NPN type BJT pipe Q1, capacitor C, inductance L 2, diode D1, diode D and capacitor C o; Input capacitance Ci is parallelly connected with direct voltage source Vi; Output capacitance Co voltage is VD Vo; Load Ro is parallelly connected with output capacitance Co; The anode of direct voltage source Vi links to each other with an end of inductance L 1; The other end of inductance L 1 links to each other with the collector electrode of NPN type BJT pipe Q1 and an end of capacitor C; The emitter of NPN type BJT pipe Q1 links to each other with the negative terminal of direct voltage source Vi and the negative terminal of VD Vo, and the other end of capacitor C links to each other with the anode of diode D and an end of inductance L 2, and the other end of inductance L 2 links to each other with the negative electrode of diode D1; The anode of diode D1 links to each other with the negative terminal of direct voltage source Vi, and the negative electrode of diode D links to each other with the anode of output voltage V o;
The BJT type auto-excitation type Sepic converter that said main switch drive loss is little also comprises the driver element of main switch Q1; The driver element of said main switch Q1 is made up of resistance R 1, resistance R 2, voltage-stabiliser tube Z1 and positive-negative-positive BJT pipe Q2; The emitter of said positive-negative-positive BJT pipe Q2 links to each other with an end of resistance R 1; The other end of resistance R 1 links to each other with an end of inductance L 1 and the anode of direct voltage source Vi; The base stage of positive-negative-positive BJT pipe Q2 links to each other with the anode of voltage-stabiliser tube Z1 and an end of resistance R 2; The negative electrode of voltage-stabiliser tube Z1 links to each other with the other end of inductance L 1 and an end of capacitor C, and the other end of resistance R 2 links to each other with the negative terminal of direct voltage source Vi, and the collector electrode of positive-negative-positive BJT pipe Q2 links to each other with the base stage of NPN type BJT pipe Q1.For improving the dynamic property of circuit, shunt capacitance C1 between the base stage that can manage Q2 at anode and the positive-negative-positive BJT of direct voltage source Vi.
Further; As preferred a kind of scheme: the BJT type auto-excitation type Sepic converter that said main switch drive loss is little also comprises the Voltage Feedback branch road; Said Voltage Feedback is propped up route resistance R 3, voltage-stabiliser tube Z2 and NPN type BJT pipe Q3 and is formed; The collector electrode of said NPN type BJT pipe Q3 links to each other with the collector electrode of positive-negative-positive BJT pipe Q2 and the base stage of NPN type BJT pipe Q1; The emitter of NPN type BJT pipe Q3 links to each other with the negative terminal of direct voltage source Vi and an end of resistance R 3, and the base stage of NPN type BJT pipe Q3 links to each other with the other end of resistance R 3 and the anode of voltage-stabiliser tube Z2, and the negative electrode of voltage-stabiliser tube Z2 links to each other with the anode of VD Vo.Be the dynamic property of raising circuit, but voltage-stabiliser tube Z2 two ends shunt capacitance C2.
Perhaps; As preferred another kind of scheme: the BJT type auto-excitation type Sepic converter that said main switch drive loss is little also comprises the current feedback branch road; Said current feedback is propped up route resistance R 3, resistance R 4, diode D2 and NPN type BJT pipe Q3 and is formed; The collector electrode of said NPN type BJT pipe Q3 links to each other with the collector electrode of positive-negative-positive BJT pipe Q2 and the base stage of NPN type BJT pipe Q1; The emitter of NPN type BJT pipe Q3 links to each other with emitter, the end of capacitor C o and the end of resistance R 4 of the negative terminal of direct voltage source Vi, NPN type BJT pipe Q1; The other end of resistance R 4 links to each other with the negative terminal of VD Vo and the negative electrode of diode D2, and the base stage of NPN type BJT pipe Q3 links to each other with the anode of diode D2 and an end of resistance R 3, and the other end of resistance R 3 links to each other with the anode of direct voltage source Vi.Be the dynamic property of raising circuit, but resistance R 3 two ends shunt capacitance C2.
Technical conceive of the present invention is: on the basis of existing BJT type auto-excitation type Sepic converter shown in Figure 1, replace former lossy big main switch driver element (as shown in Figures 2 and 3) with the little main switch driver element of loss.The little main switch driver element of loss is made up of resistance R 1, resistance R 2, positive-negative-positive BJT pipe Q2 and voltage-stabiliser tube Z1.Its characteristic is following: the emitter of positive-negative-positive BJT pipe Q2 links to each other with an end of resistance R 1; The other end of resistance R 1 links to each other with an end of inductance L 1 and the anode of direct voltage source Vi; The base stage of positive-negative-positive BJT pipe Q2 links to each other with the anode of voltage-stabiliser tube Z1 and an end of resistance R 2; The negative electrode of voltage-stabiliser tube Z1 links to each other with the other end of inductance L 1 and an end of capacitor C, and the other end of resistance R 2 links to each other with the negative terminal of direct voltage source Vi, and the collector electrode of positive-negative-positive BJT pipe Q2 links to each other with the base stage of NPN type BJT pipe Q1.For improving the dynamic property of circuit, shunt capacitance C1 between the base stage that can manage Q2 at anode and the positive-negative-positive BJT of direct voltage source Vi.
For obtaining stable VD, between the output of Sepic converter major loop and main switch driver element, can increase a Voltage Feedback branch road, form (as shown in Figure 2) by NPN type BJT pipe Q3, resistance R 3 and voltage-stabiliser tube Z2.Be the dynamic property of raising circuit, but voltage-stabiliser tube Z2 two ends shunt capacitance C2.
For obtaining stable average anode current, between the output of Sepic converter major loop and main switch driver element, can increase a current feedback branch road, form (as shown in Figure 3) by NPN type BJT pipe Q3, resistance R 3, resistance R 4 and diode D2 etc.Be the dynamic property of raising circuit, but resistance R 3 two ends shunt capacitance C2.
Beneficial effect of the present invention mainly shows: the BJT type auto-excitation type Sepic converter that the present invention proposes not only has the advantage that circuit structure is simple, the components and parts number is few; But also have the advantage that the main switch drive loss is little, light-load efficiency is high, be fit to very much the switch voltage-stabilizing or the application such as stabilized current power supply, high-brightness LED drive circuit of small-power (several watts of levels are following) buck-boost type.
Description of drawings
Fig. 1 is the circuit diagram of existing a kind of BJT type auto-excitation type Sepic converter.
Fig. 2 is the circuit diagram of the little BJT type auto-excitation type Sepic converter embodiment 1 of main switch drive loss.
Fig. 3 is the circuit diagram of the little BJT type auto-excitation type Sepic converter embodiment 2 of main switch drive loss.
That Fig. 4 is the little BJT type auto-excitation type Sepic converter embodiment 1 of main switch drive loss is critical continuously at inductive current iL1, the ideal waveform figure under the inductive current iL2 interrupter duty pattern.
That Fig. 5 is the little BJT type auto-excitation type Sepic converter embodiment 2 of main switch drive loss is critical continuously at inductive current iL1, the ideal waveform figure under the inductive current iL2 interrupter duty pattern.
Embodiment
Below in conjunction with accompanying drawing the present invention is further described.
Embodiment 1
With reference to Fig. 2 and Fig. 4; The BJT type auto-excitation type Sepic converter that a kind of main switch drive loss is little comprises the major loop of the Sepic converter of being made up of input capacitance Ci, inductance L 1, NPN type BJT pipe Q1, capacitor C, inductance L 2, diode D1, diode D and capacitor C o; Input capacitance Ci is parallelly connected with direct voltage source Vi; Output capacitance Co voltage is VD Vo, and load Ro is parallelly connected with output capacitance Co, and the anode of direct voltage source Vi links to each other with an end of inductance L 1; The other end of inductance L 1 links to each other with the collector electrode of NPN type BJT pipe Q1 and an end of capacitor C; The emitter of NPN type BJT pipe Q1 links to each other with the negative terminal of direct voltage source Vi and the negative terminal of VD Vo, and the other end of capacitor C links to each other with the anode of diode D and an end of inductance L 2, and the other end of inductance L 2 links to each other with the negative electrode of diode D1; The anode of diode D1 links to each other with the negative terminal of direct voltage source Vi, and the negative electrode of diode D links to each other with the anode of output voltage V o.
The BJT type auto-excitation type Sepic converter that said main switch drive loss is little also comprises the driver element of main switch Q1; The driver element of said main switch Q1 is made up of resistance R 1, resistance R 2, capacitor C 1, voltage-stabiliser tube Z1 and positive-negative-positive BJT pipe Q2; The emitter of said positive-negative-positive BJT pipe Q2 links to each other with an end of resistance R 1; The other end of resistance R 1 links to each other with an end of inductance L 1 and the anode of direct voltage source Vi; The base stage of positive-negative-positive BJT pipe Q2 links to each other with the anode of voltage-stabiliser tube Z1 and an end of resistance R 2; The negative electrode of voltage-stabiliser tube Z1 links to each other with the other end of inductance L 1 and an end of capacitor C, and the other end of resistance R 2 links to each other with the negative terminal of direct voltage source Vi, and the collector electrode of positive-negative-positive BJT pipe Q2 links to each other with the base stage of NPN type BJT pipe Q1.For improving the dynamic property of circuit, shunt capacitance C1 between the base stage of the anode of direct voltage source Vi and positive-negative-positive BJT pipe Q2.
Fig. 2 is the circuit diagram of the little BJT type auto-excitation type Sepic converter embodiment 1 of main switch drive loss, has adopted the Voltage Feedback branch road.Said Voltage Feedback branch road comprises NPN type BJT pipe Q3, resistance R 3, voltage-stabiliser tube Z2 and capacitor C 2; The collector electrode of NPN type BJT pipe Q3 links to each other with the collector electrode of positive-negative-positive BJT pipe Q2 and the base stage of NPN type BJT pipe Q1; The emitter of NPN type BJT pipe Q3 links to each other with the negative terminal of direct voltage source Vi and an end of resistance R 3; The base stage of NPN type BJT pipe Q3 links to each other with the other end of resistance R 3 and the anode of voltage-stabiliser tube Z2, and the negative electrode of voltage-stabiliser tube Z2 links to each other with the anode of VD Vo.For improving the dynamic property of circuit, voltage-stabiliser tube Z2 two ends shunt capacitance C2.
That Fig. 4 is the little BJT type auto-excitation type Sepic converter embodiment 1 of main switch drive loss is critical continuously at inductive current iL1, the ideal waveform figure under the inductive current iL2 interrupter duty pattern.Its circuit working principle is specific as follows:
(1) in circuit electrifying startup stage: the t=t0 moment, circuit powers on, and direct voltage source Vi (vi) rises since 0.Just begin, Q1, Q2, Q3, D and D1 all end, and the collector voltage vc1 of Q1 follows vi and changes, and VD Vo (vo) is 0.The t=t1 moment, when promptly direct voltage source vi rises to the forward conduction voltage drop of diode D, the D conducting, vi charges to C and Co through L1 and D, and capacitance voltage vc and VD vo begin to rise.The t=t2 moment, when promptly direct voltage source vi rises to certain value, Q2 conducting, Z1 forward conduction, Q1 conducting.In the t=t3 moment, when promptly vc1 rose to certain value, Q2 turn-offed, and Z1 ends, and Q1 turn-offs.Q1 closes and has no progeny, and vc1 continues to rise.Subsequently, the Z1 reverse-conducting, because of emitter-base stage conduction voltage drop, the Z1 reverse-conducting pressure drop three sum of vc1 greater than vi, Q2, Q2 and Q1 still turn-off.In the t=t4 moment, inductive current iL1 drops to 0, and D ends.After D ended, vc1 fell, Q2 and Q1 conducting.After the Q1 conducting, vi, L1, Q1 form the loop, and C, Q1, D1, L2 form another loop, L1 and L2 charging, and iL1 and iL2 increase.At this moment, Z1 forward conduction.Along with the increase of iL1, the collector current ic1 of Q1 and collector voltage vc1 also increase thereupon.In the t=t5 moment, when promptly the collector voltage vc1 of Q1 rose to certain value, Q2 turn-offed, and Z1 ends, and Q1 turn-offs.Q1 closes and has no progeny, the D conducting, and vi, L1, C, D, Co and Ro form the loop, and D1, L2, D, Co and Ro form another loop, L1 and L2 discharge, iL1 and iL2 reduce.At this moment, Z1 reverse-conducting.In the t=t6 moment, inductive current iL2 drops to 0, and D1 ends.In the t=t7 moment, inductive current iL1 drops to 0, and D ends.After D ended, vc1 fell once more, Q2 and Q1 conducting, and circuit gets into the next self-excitation work period.Go through several cycles, after the output voltage of circuit reached set point Vo, circuit had just been accomplished the electrifying startup process, got into the steady operation stage.
(2) the circuit steady operation stage: after the output voltage of circuit reached set point Vo, the Voltage Feedback branch road of circuit just began to work.When output voltage was higher than set point Vo, the Q3 conducting caused Q1 to turn-off.Through ON time (being t9-t8) that shortens Q1 and the turn-off time (being t11-t9) that prolongs Q1, realize the reduction of output voltage.When output voltage was lower than set point Vo, Q3 turn-offed, and the conducting of Q1 and turn-off time are recovered former state again, realized the lifting of output voltage.Thus, circuit can realize exporting voltage stabilizing.Among Fig. 4, in the t=t10 moment, iL2 drops to 0, and D1 ends.
Embodiment 2
With reference to Fig. 3 and Fig. 5; Present embodiment comprises the major loop of the Sepic converter of being made up of input capacitance Ci, inductance L 1, NPN type BJT pipe Q1, capacitor C, inductance L 2, diode D1, diode D and capacitor C o and the driver element of managing the main switch Q1 that Q2 forms by resistance R 1, resistance R 2, capacitor C 1, voltage-stabiliser tube Z1 and positive-negative-positive BJT, also comprises the current feedback branch road.Said current feedback branch road comprises NPN type BJT pipe Q3, resistance R 3, resistance R 4, diode D2 and capacitor C 2; The collector electrode of NPN type BJT pipe Q3 links to each other with the collector electrode of positive-negative-positive BJT pipe Q2 and the base stage of NPN type BJT pipe Q1; The emitter of NPN type BJT pipe Q3 links to each other with emitter, the end of capacitor C o and the end of resistance R 4 of the negative terminal of direct voltage source Vi, NPN type BJT pipe Q1; The other end of resistance R 4 links to each other with the negative terminal of VD Vo and the negative electrode of diode D2; The base stage of NPN type BJT pipe Q3 links to each other with the anode of diode D2 and an end of resistance R 3, and the other end of resistance R 3 links to each other with the anode of direct voltage source Vi.For improving the dynamic property of circuit, resistance R 3 two ends shunt capacitance C2.
Other circuit structures of present embodiment are identical with embodiment 1.
That Fig. 5 is the little BJT type auto-excitation type Sepic converter embodiment 2 of main switch drive loss is critical continuously at inductive current iL1, the ideal waveform figure under the inductive current iL2 interrupter duty pattern.Its circuit working principle is specific as follows:
(1) the circuit electrifying startup stage: identical with embodiment 1, go through several cycles, after the output current of circuit reached set point Io, circuit had just been accomplished the electrifying startup process, got into the steady operation stage.
(2) the circuit steady operation stage: after the output current of circuit reached set point Io, the current feedback branch road of circuit just began to work.When output current was higher than set point Io, the Q3 conducting caused Q1 to turn-off.Through ON time (being t9-t8) that shortens Q1 and the turn-off time (being t11-t9) that prolongs Q1, realize the reduction of output current.When output current was lower than set point Io, Q3 turn-offed, and the conducting of Q1 and turn-off time are recovered former state again, realized the lifting of output current.Thus, circuit can realize exporting current stabilization.Among Fig. 5, in the t=t10 moment, iL2 drops to 0, and D1 ends.
The described content of this specification embodiment only is enumerating the way of realization of inventive concept; Should not being regarded as of protection scope of the present invention only limits to the concrete form that embodiment states, protection scope of the present invention also reach in those skilled in the art conceive according to the present invention the equivalent technologies means that can expect.
Claims (6)
1. the little BJT type auto-excitation type Sepic converter of main switch drive loss comprises the major loop of the Sepic converter of being made up of input capacitance Ci, inductance L 1, NPN type BJT pipe Q1, capacitor C, inductance L 2, diode D1, diode D and capacitor C o; Input capacitance Ci is parallelly connected with direct voltage source Vi; Output capacitance Co voltage is VD Vo; Load Ro is parallelly connected with output capacitance Co; The anode of direct voltage source Vi links to each other with an end of inductance L 1; The other end of inductance L 1 links to each other with the collector electrode of NPN type BJT pipe Q1 and an end of capacitor C; The emitter of NPN type BJT pipe Q1 links to each other with the negative terminal of direct voltage source Vi and the negative terminal of VD Vo, and the other end of capacitor C links to each other with the anode of diode D and an end of inductance L 2, and the other end of inductance L 2 links to each other with the negative electrode of diode D1; The anode of diode D1 links to each other with the negative terminal of direct voltage source Vi; The negative electrode of diode D links to each other with the anode of output voltage V o, it is characterized in that: the BJT type auto-excitation type Sepic converter that said main switch drive loss is little also comprises the driver element of main switch Q1, and the driver element of said main switch Q1 is made up of resistance R 1, resistance R 2, voltage-stabiliser tube Z1 and positive-negative-positive BJT pipe Q2; The emitter of said positive-negative-positive BJT pipe Q2 links to each other with an end of resistance R 1; The other end of resistance R 1 links to each other with an end of inductance L 1 and the anode of direct voltage source Vi, and the base stage of positive-negative-positive BJT pipe Q2 links to each other with the anode of voltage-stabiliser tube Z1 and an end of resistance R 2, and the negative electrode of voltage-stabiliser tube Z1 links to each other with the other end of inductance L 1 and an end of capacitor C; The other end of resistance R 2 links to each other with the negative terminal of direct voltage source Vi, and the collector electrode of positive-negative-positive BJT pipe Q2 links to each other with the base stage of NPN type BJT pipe Q1.
2. the BJT type auto-excitation type Sepic converter that main switch drive loss as claimed in claim 1 is little is characterized in that: shunt capacitance C1 between the base stage of the anode of said direct voltage source Vi and positive-negative-positive BJT pipe Q2.
3. like one of claim 1 and the 2 little BJT type auto-excitation type Sepic converter of described main switch drive loss; It is characterized in that: said auto-excitation type Sepic converter also comprises the Voltage Feedback branch road; Said Voltage Feedback is propped up route resistance R 3, voltage-stabiliser tube Z2 and NPN type BJT pipe Q3 and is formed; The collector electrode of said NPN type BJT pipe Q3 links to each other with the collector electrode of positive-negative-positive BJT pipe Q2 and the base stage of NPN type BJT pipe Q1; The emitter of NPN type BJT pipe Q3 links to each other with the negative terminal of direct voltage source Vi and an end of resistance R 3; The base stage of NPN type BJT pipe Q3 links to each other with the other end of resistance R 3 and the anode of voltage-stabiliser tube Z2, and the negative electrode of voltage-stabiliser tube Z2 links to each other with the anode of VD Vo.
4. the BJT type auto-excitation type Sepic converter that main switch drive loss as claimed in claim 3 is little is characterized in that: said voltage-stabiliser tube Z2 two ends shunt capacitance C2.
5. like one of claim 1 and the 2 little BJT type auto-excitation type Sepic converter of described main switch drive loss; It is characterized in that: said auto-excitation type Sepic converter also comprises the current feedback branch road; Said current feedback is propped up route resistance R 3, resistance R 4, diode D2 and NPN type BJT pipe Q3 and is formed; The collector electrode of said NPN type BJT pipe Q3 links to each other with the collector electrode of positive-negative-positive BJT pipe Q2 and the base stage of NPN type BJT pipe Q1; The emitter of NPN type BJT pipe Q3 links to each other with emitter, the end of capacitor C o and the end of resistance R 4 of the negative terminal of direct voltage source Vi, NPN type BJT pipe Q1; The other end of resistance R 4 links to each other with the negative terminal of VD Vo and the negative electrode of diode D2; The base stage of NPN type BJT pipe Q3 links to each other with the anode of diode D2 and an end of resistance R 3, and the other end of resistance R 3 links to each other with the anode of direct voltage source Vi.
6. the BJT type auto-excitation type Sepic converter that main switch drive loss as claimed in claim 5 is little is characterized in that: said resistance R 3 two ends shunt capacitance C2.
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| CN201210157708.9A CN102684487B (en) | 2012-05-17 | 2012-05-17 | BJT type self-excited Sepic converter equipped with main switching tube with low drive loss |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103997212A (en) * | 2014-06-10 | 2014-08-20 | 杭州钛丽能源科技有限公司 | Input adaptive auto-excitation type Sepic convertor |
| CN108512412A (en) * | 2018-06-15 | 2018-09-07 | 广东机电职业技术学院 | A kind of DC-DC power source structure of the positive negative output of the single tube lifting press based on Sepic |
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| JP2002136110A (en) * | 2000-10-25 | 2002-05-10 | Tdk Corp | Non-isolated chopper converter |
| CN2529442Y (en) * | 2002-01-08 | 2003-01-01 | 浙江大学 | Synchronous rectification drive circuit of power transformer |
| JP2003339157A (en) * | 2002-05-17 | 2003-11-28 | Cosel Co Ltd | Self-excited switching power unit |
| JP4110357B2 (en) * | 2001-04-04 | 2008-07-02 | セイコーエプソン株式会社 | Self-excited switching regulator |
| CN101877534A (en) * | 2010-06-28 | 2010-11-03 | 浙江工业大学 | Bipolar transistor self-exciting Sepic converter |
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2012
- 2012-05-17 CN CN201210157708.9A patent/CN102684487B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002136110A (en) * | 2000-10-25 | 2002-05-10 | Tdk Corp | Non-isolated chopper converter |
| JP4110357B2 (en) * | 2001-04-04 | 2008-07-02 | セイコーエプソン株式会社 | Self-excited switching regulator |
| CN2529442Y (en) * | 2002-01-08 | 2003-01-01 | 浙江大学 | Synchronous rectification drive circuit of power transformer |
| JP2003339157A (en) * | 2002-05-17 | 2003-11-28 | Cosel Co Ltd | Self-excited switching power unit |
| CN101877534A (en) * | 2010-06-28 | 2010-11-03 | 浙江工业大学 | Bipolar transistor self-exciting Sepic converter |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103997212A (en) * | 2014-06-10 | 2014-08-20 | 杭州钛丽能源科技有限公司 | Input adaptive auto-excitation type Sepic convertor |
| CN108512412A (en) * | 2018-06-15 | 2018-09-07 | 广东机电职业技术学院 | A kind of DC-DC power source structure of the positive negative output of the single tube lifting press based on Sepic |
| CN108512412B (en) * | 2018-06-15 | 2023-06-09 | 广东机电职业技术学院 | Single-tube buck-boost positive-negative output DC-DC power supply structure based on Sepic |
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| CN102684487B (en) | 2014-08-06 |
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