CN102820780B - Bipolar junction transistor (BJT) auto-excitation type Zeta convertor with low main switch tube drive loss - Google Patents
Bipolar junction transistor (BJT) auto-excitation type Zeta convertor with low main switch tube drive loss Download PDFInfo
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Abstract
A bipolar junction transistor (BJT) auto-excitation type Zeta convertor with a low main switch tube drive loss comprises a main loop of the Zeta convertor and a drive unit of a main switch tube Q1, wherein the main loop is assembled by an input capacitor Ci, a PNP type BJT Q1, an inductor L1, a capacitor C, a diode D, a diode D1, an inductor L2 and a capacitor Co, and the drive unit of the main switch tube Q1 is formed by a resistor R1, a resistor R2, a resistor R3, a resistor R4, a NPN type BJT Q2 and a PNP type BJT Q3. The converter has the advantages of being simple in circuit structure, few in component, low in main switch tube drive loss and high in circuit efficiency during light load.
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 Zeta 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 remarkable advantage that cost performance is high.What Fig. 1 provided is that a kind of circuit structure is simple, the BJT(bipolar transistor that components and parts number is few) type auto-excitation type Zeta converter, comprise by input capacitance Ci, positive-negative-positive BJT manages Q1, diode D1, inductance L 1, capacitor C, diode D, the major loop of the Zeta converter of inductance L 2 and output capacitance Co composition, input capacitance Ci is in parallel with direct voltage source Vi, output capacitance Co both end voltage is VD Vo, load Ro is in parallel with output capacitance Co, the negative terminal of direct voltage source Vi is connected with the negative terminal of VD Vo and the anode of diode D, the anode of direct voltage source Vi is connected with the emitter of positive-negative-positive BJT pipe Q1, the collector electrode of positive-negative-positive BJT pipe Q1 is connected with the anode of diode D1 and one end of capacitor C, the negative electrode of diode D1 is connected with one end of inductance L 1, the other end of inductance L 1 is connected with the negative terminal of direct voltage source Vi, the other end of capacitor C is connected with one end of inductance L 2 and the negative electrode of diode D, the other end of inductance L 2 is connected with the anode of output voltage V o.BJT type auto-excitation type Zeta converter shown in Fig. 1 also comprises the driver element of main switch Q1, the driver element of described main switch Q1 is by resistance R 1, resistance R 2, resistance R 3, capacitor C 1 and positive-negative-positive BJT pipe Q2 composition, the emitter and collector of described positive-negative-positive BJT pipe Q2 is connected with base stage with the emitter of positive-negative-positive BJT pipe Q1 respectively, the base stage of positive-negative-positive BJT pipe Q1 is also connected to the negative terminal of direct voltage source Vi by resistance R 1, resistance R 3 and capacitor C 1 form parallel branch, one end of described parallel branch is connected with the negative electrode of diode D1, the other end of described parallel branch is connected with the positive-negative-positive BJT pipe base stage of Q2 and one end of resistance R 2, the other end of resistance R 2 is connected with the emitter of positive-negative-positive BJT pipe Q2.BJT type auto-excitation type Zeta converter shown in Fig. 1 also comprises Voltage Feedback branch road, described Voltage Feedback props up route resistance R 4, resistance R 5, voltage-stabiliser tube Z1 and NPN type BJT pipe Q3 composition, the negative electrode of described voltage-stabiliser tube Z1 is connected with the anode of VD Vo, the anode of voltage-stabiliser tube Z1 is connected with one end of resistance R 5 and the base stage of NPN type BJT pipe Q3, the collector electrode of NPN type BJT pipe Q3 is connected with the base stage of positive-negative-positive BJT pipe Q2 by resistance R 4, and the NPN type BJT pipe emitter of 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: by the driver element of the main switch Q1 that drives resistance R 1, positive-negative-positive BJT pipe Q2, resistance R 2, resistance R 3 and capacitor C 1 to form, in the time that main switch Q1 turn-offs, still have larger electric current to flow through and drive resistance R 1, cause the driving loss of Q1 larger, thereby affect the efficiency of circuit, especially the light-load efficiency of circuit.
Summary of the invention
Drive the larger deficiency of loss for overcoming existing BJT type auto-excitation type Zeta converter main switch, the invention provides a kind of main switch and drive the little BJT type auto-excitation type Zeta converter of loss.
The technical solution adopted for the present invention to solve the technical problems is: a kind of main switch drives the little BJT type auto-excitation type Zeta converter of loss to comprise by input capacitance Ci, positive-negative-positive BJT manages Q1, inductance L 1, capacitor C, diode D, diode D1, the major loop of the Zeta converter of inductance L 2 and capacitor C o composition, input capacitance Ci is in parallel with direct voltage source Vi, output capacitance Co both end voltage is VD Vo, load Ro is in parallel with output capacitance Co, the anode of direct voltage source Vi is connected with the emitter of positive-negative-positive BJT pipe Q1, the collector electrode of positive-negative-positive BJT pipe Q1 is connected with one end of inductance L 1 and one end of capacitor C, the negative terminal of the other end of inductance L 1 and direct voltage source Vi, the anode of the negative terminal of output voltage V o and diode D is connected, the other end of capacitor C is connected with the negative electrode of diode D and the anode of diode D1, the negative electrode of diode D1 is connected with one end of inductance L 2, the other end of inductance L 2 is connected with the anode of output voltage V o,
Described main switch drives the little BJT type auto-excitation type zeta converter of loss also to comprise the driver element of main switch Q1, the driver element of described main switch Q1 is by resistance R 1, resistance R 2, resistance R 3, resistance R 4, NPN type BJT pipe Q2 and positive-negative-positive BJT pipe Q3 composition, the collector electrode of described NPN type BJT pipe Q2 is connected with one end of resistance R 1, the other end of resistance R 1 is connected with the base stage of positive-negative-positive BJT pipe Q1, the emitter of NPN type BJT pipe Q2 is connected with one end of resistance R 2, the other end of resistance R 2 is connected with the negative terminal of direct voltage source Vi, the emitter of the NPN type BJT pipe base stage of Q2 and one end of resistance R 3 and positive-negative-positive BJT pipe Q3 is connected, the other end of resistance R 3 is connected with the emitter of positive-negative-positive BJT pipe Q1, the base stage of positive-negative-positive BJT pipe Q3 is connected with the positive-negative-positive BJT pipe collector electrode of Q3 and one end of resistance R 4, the other end of resistance R 4 is connected with the collector electrode of positive-negative-positive BJT pipe Q1.For improving the dynamic property of circuit, can manage shunt capacitance C1 between the collector electrode of Q1 and the base stage of NPN type BJT pipe Q2 at positive-negative-positive BJT.In addition, the collector electrode of positive-negative-positive BJT pipe Q3 can reconfiguration in the negative terminal of direct voltage source Vi, resistance R 2 can short circuit.
Further, as preferred a kind of scheme: described main switch drives the little BJT type auto-excitation type Zeta converter of loss also to comprise Voltage Feedback branch road, described Voltage Feedback props up route resistance R 5, resistance R 6, voltage-stabiliser tube Z1 and NPN type BJT pipe Q4 composition, the collector electrode of described NPN type BJT pipe Q4 is connected with one end of resistance R 5, the other end of resistance R 5 is connected with the base stage of NPN type BJT pipe Q2, one end of the NPN type BJT pipe emitter of Q4 and the negative terminal of direct voltage source Vi and resistance R 6 is connected, the anode of the NPN type BJT pipe base stage of Q4 and the other end of resistance R 6 and voltage-stabiliser tube Z1 is connected, the negative electrode of voltage-stabiliser tube Z1 is connected with the anode of output voltage V o.For improving the dynamic property of circuit, can be at voltage-stabiliser tube Z1 two ends shunt capacitance C2.
Or, as preferred another kind of scheme: described main switch drives the little BJT type auto-excitation type Zeta converter of loss also to comprise current feedback branch road, described current feedback branch road comprises NPN type BJT pipe Q4, resistance R 5, resistance R 6, resistance R 7 and diode D2, the collector electrode of NPN type BJT pipe Q4 is connected with one end of resistance R 5, the other end of resistance R 5 is connected with the base stage of NPN type BJT pipe Q2 and the emitter of positive-negative-positive BJT pipe Q3, the NPN type BJT pipe emitter of Q4 and the negative terminal of direct voltage source Vi, the anode of diode D, one end of one end of capacitor C o and resistance R 7 is connected, the other end of resistance R 7 is connected with the negative terminal of VD Vo and the negative electrode of diode D2, one end of the NPN type BJT pipe base stage of Q4 and the anode of diode D2 and resistance R 6 is connected, the other end of resistance R 6 is connected with the anode of input voltage source Vi and the emitter of positive-negative-positive BJT pipe Q1.For improving the dynamic property of circuit, can be at resistance R 6 two ends shunt capacitance C2.
Technical conceive of the present invention is: on the basis of existing BJT type auto-excitation type Zeta converter shown in Fig. 1, the main switch driver element little with loss replaces former lossy large main switch driver element (as shown in Fig. 2 ~ 5).The little main switch driver element of loss is made up of resistance R 1, resistance R 2, resistance R 3, resistance R 4, NPN type BJT pipe Q2 and positive-negative-positive BJT pipe Q3.Its feature is as follows: the base stage of the positive-negative-positive BJT pipe emitter of Q3 and one end of resistance R 3 and NPN type BJT pipe Q2 is connected, the other end of resistance R 3 is connected with the anode of input voltage source Vi and the emitter of positive-negative-positive BJT pipe Q1, the collector electrode of positive-negative-positive BJT pipe Q3 is connected with the positive-negative-positive BJT pipe base stage of Q3 and one end of resistance R 4, the other end of resistance R 4 is connected with the collector electrode of positive-negative-positive BJT pipe Q1, the collector electrode of NPN type BJT pipe Q2 is connected with one end of resistance R 1, the other end of resistance R 1 is connected with the base stage of positive-negative-positive BJT pipe Q1, the emitter of NPN type BJT pipe Q2 is connected with one end of resistance R 2, the other end of resistance R 2 is connected with the negative terminal of direct voltage source Vi.For improving the dynamic property of circuit, can manage shunt capacitance C1 between the collector electrode of Q1 and the base stage of NPN type BJT pipe Q2 at positive-negative-positive BJT.In addition, the collector electrode of positive-negative-positive BJT pipe Q3 can reconfiguration in the negative terminal of direct voltage source Vi, resistance R 2 also can short circuit.
For obtaining stable VD, between the output of Zeta converter major loop and main switch driver element, can increase a Voltage Feedback branch road, form (as shown in Figure 2 and Figure 4) by NPN type BJT pipe Q4, resistance R 5, resistance R 6 and voltage-stabiliser tube Z1.For improving the dynamic property of whole circuit, can be at voltage-stabiliser tube Z1 two ends shunt capacitance C2.
For obtaining stable average anode current, between the output of Zeta converter major loop and main switch driver element, can increase a current feedback branch road, form (as shown in Figure 3 and Figure 5) by NPN type BJT pipe Q4, resistance R 5, resistance R 6, resistance R 7 and diode D2.For improving the dynamic property of whole circuit, can be at resistance R 6 two ends shunt capacitance C2.
Beneficial effect of the present invention is mainly manifested in: the BJT type auto-excitation type Zeta converter that the present invention proposes not only has advantages of that circuit structure is simple, components and parts number is few, but also have advantages of that main switch driving loss is little, light-load efficiency is high, be applicable to very much the application such as switch voltage-stabilizing or stabilized current power supply, high-brightness LED drive circuit of small-power (several watts of levels are following) buck-boost type.
Brief description of the drawings
Fig. 1 is the circuit diagram of existing a kind of BJT type auto-excitation type Zeta converter.
Fig. 2 is the circuit diagram that main switch drives the little BJT type auto-excitation type Zeta converter embodiment 1 of loss.
Fig. 3 is the circuit diagram that main switch drives the little BJT type auto-excitation type Zeta converter embodiment 2 of loss.
Fig. 4 is the circuit diagram that main switch drives the little BJT type auto-excitation type Zeta converter embodiment 3 of loss.
Fig. 5 is the circuit diagram that main switch drives the little BJT type auto-excitation type Zeta converter embodiment 4 of loss.
Fig. 6 is that main switch drives the ideal waveform figure of the little BJT type auto-excitation type Zeta converter embodiment 1 of loss under inductive current iL1 critical continuous mode, inductive current iL2 interrupter duty pattern.
Fig. 7 is that main switch drives the ideal waveform figure of the little BJT type auto-excitation type Zeta converter embodiment 2 of loss under inductive current iL1 critical continuous mode, inductive current iL2 interrupter duty pattern.
Fig. 8 is that main switch drives the ideal waveform figure of the little BJT type auto-excitation type Zeta converter embodiment 3 of loss under inductive current iL1 critical continuous mode, inductive current iL2 interrupter duty pattern.
Fig. 9 is that main switch drives the ideal waveform figure of the little BJT type auto-excitation type Zeta converter embodiment 4 of loss under inductive current iL1 critical continuous mode, inductive current iL2 interrupter duty pattern.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Embodiment 1
With reference to Fig. 2 and Fig. 6, a kind of main switch drives the little BJT type auto-excitation type Zeta converter of loss to comprise by input capacitance Ci, positive-negative-positive BJT manages Q1, inductance L 1, capacitor C, diode D, diode D1, the major loop of the Zeta converter of inductance L 2 and capacitor C o composition, input capacitance Ci is in parallel with direct voltage source Vi, output capacitance Co both end voltage is VD Vo, load Ro is in parallel with output capacitance Co, the anode of direct voltage source Vi is connected with the emitter of positive-negative-positive BJT pipe Q1, the collector electrode of positive-negative-positive BJT pipe Q1 is connected with one end of inductance L 1 and one end of capacitor C, the negative terminal of the other end of inductance L 1 and direct voltage source Vi, the anode of the negative terminal of output voltage V o and diode D is connected, the other end of capacitor C is connected with the negative electrode of diode D and the anode of diode D1, the negative electrode of diode D1 is connected with one end of inductance L 2, the other end of inductance L 2 is connected with the anode of output voltage V o.Described main switch drives the little BJT type auto-excitation type zeta converter of loss also to comprise the driver element of main switch Q1, the driver element of described main switch Q1 is by resistance R 1, resistance R 2, resistance R 3, resistance R 4, capacitor C 1, NPN type BJT pipe Q2 and positive-negative-positive BJT pipe Q3 composition, the collector electrode of described NPN type BJT pipe Q2 is connected with one end of resistance R 1, the other end of resistance R 1 is connected with the base stage of positive-negative-positive BJT pipe Q1, the emitter of NPN type BJT pipe Q2 is connected with one end of resistance R 2, the other end of resistance R 2 is connected with the negative terminal of direct voltage source Vi, the emitter of the NPN type BJT pipe base stage of Q2 and one end of resistance R 3 and positive-negative-positive BJT pipe Q3 is connected, the other end of resistance R 3 is connected with the emitter of positive-negative-positive BJT pipe Q1, the base stage of positive-negative-positive BJT pipe Q3 is connected with the positive-negative-positive BJT pipe collector electrode of Q3 and one end of resistance R 4, the other end of resistance R 4 is connected with the collector electrode of positive-negative-positive BJT pipe Q1.For improving the dynamic property of circuit, shunt capacitance C1 between the collector electrode of positive-negative-positive BJT pipe Q1 and the base stage of NPN type BJT pipe Q2.
Fig. 2 is the circuit diagram that main switch drives the little BJT type auto-excitation type Zeta converter embodiment 1 of loss, has adopted Voltage Feedback branch road.Described Voltage Feedback props up route resistance R 5, resistance R 6, capacitor C 2, voltage-stabiliser tube Z1 and NPN type BJT pipe Q4 composition, the collector electrode of described NPN type BJT pipe Q4 is connected with one end of resistance R 5, the other end of resistance R 5 is connected with the base stage of NPN type BJT pipe Q2, one end of the NPN type BJT pipe emitter of Q4 and the negative terminal of direct voltage source Vi and resistance R 6 is connected, the anode of the NPN type BJT pipe base stage of Q4 and the other end of resistance R 6 and voltage-stabiliser tube Z1 is connected, and the negative electrode of voltage-stabiliser tube Z1 is connected with the anode of output voltage V o.For improving the dynamic property of circuit, voltage-stabiliser tube Z1 two ends shunt capacitance C2.
Fig. 6 is that main switch drives the ideal waveform figure of the little BJT type auto-excitation type Zeta converter embodiment 1 of loss under inductive current iL1 critical continuous mode, inductive current iL2 interrupter duty pattern.Its circuit working principle is specific as follows:
(1) the circuit electrifying startup stage: in the t=t0 moment, circuit powers on, direct voltage source Vi(vi) rise since 0.Just start, Q1, Q2, Q3, Q4, D and D1 all end, output voltage V o(vo) be 0.The t=t1 moment, when Vi rises to certain value, Q2 conducting, and then Q1 conducting.After Q1 conducting, vi, Q1 and L1 form loop, and vi, Q1, C, D1, L2, Co and Ro form another loop, L1 and L2 charging, and inductive current iL1 and iL2 increase, capacitor C reverse charging, capacitance voltage vc oppositely rises, and output voltage vo rises.Along with the increase of iL1 and iL2, Q1 collector current ic1 and emitter-collector voltage vec1 also increase thereupon, cause the collector voltage vc1 of Q1 to fall.The t=t2 moment, when vc1 drops into certain value, Q3 conducting, Q2 turn-offs, and then Q1 turn-offs.Q1 closes and has no progeny, D conducting, and L1, D and C form loop, and D1, L2, Co, Ro and D form another loop, L1 and L2 electric discharge, inductive current iL1 and iL2 reduce, capacitor C positive charge, capacitance voltage vc forward rises, and output voltage vo continues to rise.In the t=t3 moment, inductive current iL2 is reduced to 0, D1 and turn-offs.In the t=t4 moment, inductive current iL1 is reduced to 0, D and turn-offs.D closes and has no progeny, Q2 and Q1 conducting again, and Q3 turn-offs, and circuit enters the next self-excitation work period.Go through several cycles, after the output voltage of circuit reaches set point Vo, circuit has just completed electrifying startup process, enters the steady operation stage.
(2) the circuit steady operation stage: after the output voltage of circuit reaches set point Vo, the Voltage Feedback branch road of circuit just starts to work.When output voltage is during higher than set point Vo, make Q4 conducting by the effect of Z1, and then cause Q2 and Q1 to turn-off, by shorten Q1 ON time (being t6-t5), extend deadline (being t8-t6) of Q1, realize the reduction of output voltage.When output voltage is during lower than set point Vo, Z1 is inoperative, and Q4 turn-offs, and the conducting of Q1 and deadline are recovered again former state, realize the lifting of output voltage.Thus, circuit can be realized output voltage stabilizing.In Fig. 6, in the t=t7 moment, iL2 drops to 0, D1 cut-off.
Embodiment 2
With reference to Fig. 3 and Fig. 7, the driver element that the present embodiment comprises the major loop of Zeta converter be made up of input capacitance Ci, positive-negative-positive BJT pipe Q1, inductance L 1, capacitor C, diode D, diode D1, inductance L 2 and capacitor C o and manages by resistance R 1, resistance R 2, resistance R 3, resistance R 4, capacitor C 1, NPN type BJT pipe Q2 and positive-negative-positive BJT the main switch Q1 that Q3 forms, also comprises current feedback branch road.Described current feedback branch road comprises NPN type BJT pipe Q4, resistance R 5, resistance R 6, resistance R 7, capacitor C 2 and diode D2, the collector electrode of NPN type BJT pipe Q4 is connected with one end of resistance R 5, the other end of resistance R 5 is connected with the base stage of NPN type BJT pipe Q2 and the emitter of positive-negative-positive BJT pipe Q3, the NPN type BJT pipe emitter of Q4 and the negative terminal of direct voltage source Vi, the anode of diode D, one end of one end of capacitor C o and resistance R 7 is connected, the other end of resistance R 7 is connected with the negative terminal of VD Vo and the negative electrode of diode D2, one end of the NPN type BJT pipe base stage of Q4 and the anode of diode D2 and resistance R 6 is connected, the other end of resistance R 6 is connected with the anode of input voltage source Vi and the emitter of positive-negative-positive BJT pipe Q1.For improving the dynamic property of circuit, resistance R 6 two ends shunt capacitance C2.
Other circuit structures of the present embodiment are identical with embodiment 1.
Fig. 7 is that main switch drives the ideal waveform figure of the little BJT type auto-excitation type Zeta converter embodiment 2 of loss under inductive current iL1 critical continuous mode, 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 reaches set point Io, circuit has just completed electrifying startup process, enters the steady operation stage.
(2) the circuit steady operation stage: after the output current of circuit reaches set point Io, the current feedback branch road of circuit just starts to work.In the time that output current is greater than set point Io, make Q4 conducting by the effect of D2 and R7, and then cause Q2 and Q1 to turn-off, by shortening the ON time (being t6-t5) of Q1, the deadline (being t8-t6) of prolongation Q1, realize reducing of output current.In the time that output current is less than set point Io, D2 and R7 are inoperative, and Q4 turn-offs, and the conducting of Q1 and deadline are recovered again former state, realize the lifting of output current.Thus, circuit can be realized output current stabilization.In Fig. 7, in the t=t7 moment, iL2 drops to 0, D1 cut-off.
Embodiment 3
With reference to Fig. 4 and Fig. 8, the present embodiment comprises the major loop of the Zeta converter being made up of input capacitance Ci, positive-negative-positive BJT pipe Q1, inductance L 1, capacitor C, diode D, diode D1, inductance L 2 and capacitor C o, also comprises the driver element of main switch Q1.The driver element of described main switch Q1 is by resistance R 1, resistance R 2, resistance R 3, resistance R 4, capacitor C 1, NPN type BJT pipe Q2 and positive-negative-positive BJT pipe Q3 composition, the collector electrode of described NPN type BJT pipe Q2 is connected with one end of resistance R 1, the other end of resistance R 1 is connected with the base stage of positive-negative-positive BJT pipe Q1, the emitter of NPN type BJT pipe Q2 is connected with one end of resistance R 2, the other end of resistance R 2 is connected with the negative terminal of direct voltage source Vi, the emitter of the NPN type BJT pipe base stage of Q2 and one end of resistance R 3 and positive-negative-positive BJT pipe Q3 is connected, the other end of resistance R 3 is connected with the emitter of positive-negative-positive BJT pipe Q1, the base stage of positive-negative-positive BJT pipe Q3 is connected with one end of resistance R 4, the other end of resistance R 4 is connected with the collector electrode of positive-negative-positive BJT pipe Q1, the collector electrode of positive-negative-positive BJT pipe Q3 is connected with the negative terminal of direct voltage source Vi.For improving the dynamic property of circuit, shunt capacitance C1 between the collector electrode of positive-negative-positive BJT pipe Q1 and the base stage of NPN type BJT pipe Q2.
Other circuit structures of the present embodiment are identical with embodiment 1.
Fig. 8 is that main switch drives the ideal waveform figure of the little BJT type auto-excitation type Zeta converter embodiment 3 of loss under inductive current iL1 critical continuous mode, inductive current iL2 interrupter duty pattern.Its circuit working principle is similar to embodiment 1, and circuit also can be realized output voltage stabilizing.
Embodiment 4
With reference to Fig. 5 and Fig. 9, the present embodiment comprises the major loop of the Zeta converter being made up of input capacitance Ci, positive-negative-positive BJT pipe Q1, inductance L 1, capacitor C, diode D, diode D1, inductance L 2 and capacitor C o, also comprises the driver element of main switch Q1.The driver element of described main switch Q1 is by resistance R 1, resistance R 3, resistance R 4, capacitor C 1, NPN type BJT pipe Q2 and positive-negative-positive BJT pipe Q3 composition, the collector electrode of described NPN type BJT pipe Q2 is connected with one end of resistance R 1, the other end of resistance R 1 is connected with the base stage of positive-negative-positive BJT pipe Q1, the emitter of NPN type BJT pipe Q2 is connected with the negative terminal of direct voltage source Vi, the emitter of the NPN type BJT pipe base stage of Q2 and one end of resistance R 3 and positive-negative-positive BJT pipe Q3 is connected, the other end of resistance R 3 is connected with the emitter of positive-negative-positive BJT pipe Q1, the base stage of positive-negative-positive BJT pipe Q3 is connected with the positive-negative-positive BJT pipe collector electrode of Q3 and one end of resistance R 4, the other end of resistance R 4 is connected with the collector electrode of positive-negative-positive BJT Q1.For improving the dynamic property of circuit, shunt capacitance C1 between the collector electrode of positive-negative-positive BJT pipe Q1 and the base stage of NPN type BJT pipe Q2.
Other circuit structures of the present embodiment are identical with embodiment 2.
Fig. 9 is that main switch drives the ideal waveform figure of the little BJT type auto-excitation type Zeta converter embodiment 4 of loss under inductive current iL1 critical continuous mode, inductive current iL2 interrupter duty pattern.Its circuit working principle is similar to embodiment 2, and circuit also can be realized output current stabilization.
Content described in this specification embodiment is only enumerating of way of realization to inventive concept; protection scope of the present invention should not be regarded as only limiting to the concrete form that embodiment states, protection scope of the present invention is also and conceive the equivalent technologies means that can expect according to the present invention in those skilled in the art.
Claims (8)
1. a main switch drives the little BJT type auto-excitation type Zeta converter of loss, comprise by input capacitance Ci, positive-negative-positive BJT manages Q1, inductance L 1, capacitor C, diode D, diode D1, the major loop of the Zeta converter of inductance L 2 and output capacitance Co composition, input capacitance Ci is in parallel with direct voltage source Vi, output capacitance Co both end voltage is VD Vo, load Ro is in parallel with output capacitance Co, the anode of direct voltage source Vi is connected with the emitter of positive-negative-positive BJT pipe Q1, the collector electrode of positive-negative-positive BJT pipe Q1 is connected with one end of inductance L 1 and one end of capacitor C, the negative terminal of the other end of inductance L 1 and direct voltage source Vi, the anode of the negative terminal of output voltage V o and diode D is connected, the other end of capacitor C is connected with the negative electrode of diode D and the anode of diode D1, the negative electrode of diode D1 is connected with one end of inductance L 2, the other end of inductance L 2 is connected with the anode of output voltage V o, it is characterized in that: described auto-excitation type Zeta converter also comprises the driver element of positive-negative-positive BJT pipe Q1, the driver element of described positive-negative-positive BJT pipe Q1 is by resistance R 1, resistance R 2, resistance R 3, resistance R 4, NPN type BJT pipe Q2 and positive-negative-positive BJT pipe Q3 composition, the collector electrode of described NPN type BJT pipe Q2 is connected with one end of resistance R 1, the other end of resistance R 1 is connected with the base stage of positive-negative-positive BJT pipe Q1, the emitter of NPN type BJT pipe Q2 is connected with one end of resistance R 2, the other end of resistance R 2 is connected with the negative terminal of direct voltage source Vi, the emitter of the NPN type BJT pipe base stage of Q2 and one end of resistance R 3 and positive-negative-positive BJT pipe Q3 is connected, the other end of resistance R 3 is connected with the emitter of positive-negative-positive BJT pipe Q1, the base stage of positive-negative-positive BJT pipe Q3 is connected with the positive-negative-positive BJT pipe collector electrode of Q3 and one end of resistance R 4, the other end of resistance R 4 is connected with the collector electrode of positive-negative-positive BJT pipe Q1,
Described main switch drives the little BJT type auto-excitation type Zeta converter of loss at inductive current iL1 critical continuous mode, under inductive current iL2 interrupter duty pattern, after positive-negative-positive BJT pipe Q1 conducting, direct voltage source Vi, positive-negative-positive BJT pipe Q1 and inductance L 1 form loop, direct voltage source Vi, positive-negative-positive BJT manages Q1, capacitor C, diode D1, inductance L 2, output capacitance Co and load Ro form another loop, inductance L 1 and inductance L 2 are charged, inductive current iL1 and inductive current iL2 increase, emitter-collector voltage vec1 of the collector current ic1 of positive-negative-positive BJT pipe Q1 and positive-negative-positive BJT pipe Q1 also increases, the collector voltage vc1 of positive-negative-positive BJT pipe Q1 falls, in the time that the collector voltage vc1 of positive-negative-positive BJT pipe Q1 drops into certain value, positive-negative-positive BJT pipe Q3 conducting, NPN type BJT pipe Q2 turn-offs, and positive-negative-positive BJT pipe Q1 turn-offs, positive-negative-positive BJT pipe Q1 closes and has no progeny, diode D conducting, inductance L 1, diode D and capacitor C form loop, and diode D1, inductance L 2, output capacitance Co, load Ro and diode D form another loop, inductance L 1 and inductance L 2 are discharged, in the time that inductive current iL2 is reduced to 0, diode D1 turn-offs, in the time that inductive current iL1 is reduced to 0, diode D turn-offs, diode D closes and has no progeny, NPN type BJT pipe Q2 and positive-negative-positive BJT pipe Q1 conducting, and positive-negative-positive BJT pipe Q3 turn-offs.
2. main switch as claimed in claim 1 drives the little BJT type auto-excitation type Zeta converter of loss, it is characterized in that: the collector electrode reconfiguration of described positive-negative-positive BJT pipe Q3 is in the negative terminal of direct voltage source Vi.
3. main switch as claimed in claim 1 drives the little BJT type auto-excitation type Zeta converter of loss, it is characterized in that: shunt capacitance C1 between the collector electrode of described positive-negative-positive BJT pipe Q1 and the base stage of NPN type BJT pipe Q2.
4. main switch as claimed in claim 2 drives the little BJT type auto-excitation type Zeta converter of loss, it is characterized in that: shunt capacitance C1 between the collector electrode of described positive-negative-positive BJT pipe Q1 and the base stage of NPN type BJT pipe Q2.
5. the main switch as described in one of claim 1～4 drives the little BJT type auto-excitation type Zeta converter of loss, it is characterized in that: described auto-excitation type Zeta converter also comprises Voltage Feedback branch road, described Voltage Feedback props up route resistance R 5, resistance R 6, voltage-stabiliser tube Z1 and NPN type BJT pipe Q4 composition, the collector electrode of described NPN type BJT pipe Q4 is connected with one end of resistance R 5, the other end of resistance R 5 is connected with the base stage of NPN type BJT pipe Q2, one end of the NPN type BJT pipe emitter of Q4 and the negative terminal of direct voltage source Vi and resistance R 6 is connected, the anode of the NPN type BJT pipe base stage of Q4 and the other end of resistance R 6 and voltage-stabiliser tube Z1 is connected, the negative electrode of voltage-stabiliser tube Z1 is connected with the anode of output voltage V o.
6. main switch as claimed in claim 5 drives the little BJT type auto-excitation type Zeta converter of loss, it is characterized in that: the two ends shunt capacitance C2 of described voltage-stabiliser tube Z1.
7. the main switch as described in one of claim 1～4 drives the little BJT type auto-excitation type Zeta converter of loss, it is characterized in that: described auto-excitation type Zeta converter also comprises current feedback branch road, described current feedback is propped up route resistance R 5, resistance R 6, resistance R 7, diode D2 and NPN type BJT pipe Q4 composition, the collector electrode of described NPN type BJT pipe Q4 is connected with one end of resistance R 5, the other end of resistance R 5 is connected with the base stage of NPN type BJT pipe Q2 and the emitter of positive-negative-positive BJT pipe Q3, the NPN type BJT pipe emitter of Q4 and the negative terminal of direct voltage source Vi, the anode of diode D, one end of one end of output capacitance Co and resistance R 7 is connected, the other end of resistance R 7 is connected with the negative terminal of VD Vo and the negative electrode of diode D2, one end of the NPN type BJT pipe base stage of Q4 and the anode of diode D2 and resistance R 6 is connected, the other end of resistance R 6 is connected with the anode of input voltage source Vi and the emitter of positive-negative-positive BJT pipe Q1.
8. main switch as claimed in claim 7 drives the little BJT type auto-excitation type Zeta converter of loss, it is characterized in that: described resistance R 6 two ends shunt capacitance C2.
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| CN104009503A (en) * | 2013-02-25 | 2014-08-27 | 立锜科技股份有限公司 | Charging circuit and control circuit and control method |
| CN104038057B (en) * | 2014-06-10 | 2016-04-20 | 浙江工业大学 | Input adaptive auto-excitation type Zeta converter |
| CN104038058B (en) * | 2014-06-10 | 2016-08-17 | 浙江日风电气股份有限公司 | Input adaptive auto-excitation type Buck-boost changer |
| CN104967313A (en) * | 2015-07-20 | 2015-10-07 | 哈尔滨工业大学 | Coupled inductor-type three-level Zeta converter |
| CN109787477B (en) * | 2018-04-02 | 2024-04-12 | 浙江工业大学 | Self-excited DC-DC converter with switch on input side and staggered parallel connection mode thereof |
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| JP2002312041A (en) * | 2001-04-10 | 2002-10-25 | Max Co Ltd | Switching regulator |
| JP2003339157A (en) * | 2002-05-17 | 2003-11-28 | Cosel Co Ltd | Self-excited switching power unit |
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