CN105207464A - Self-exciting BJT type bridge-free Zeta PFC rectifier circuit - Google Patents

Abstract

A self-excited BJT type bridgeless Zeta? PFC rectifier circuit, including input capacitor Ci, PNP type BJT tube Q1, PNP type BJT tube Q2, NPN type BJT tube Q3, NPN type BJT tube Q4, PNP type BJT tube Q5, PNP type BJT tube Q6, diode D1, diode D2 , inductor L1, inductor L2, capacitor Cs, output capacitor Co, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6 and are used to control the base current of PNP type BJT tube Q1 through port a so as to realize the The control of the working state of the PNP BJT tube Q1 and the controlled current source group M1 controlling the working state of the PNP BJT tube Q2 by controlling the base current of the PNP BJT tube Q2 through port b. The invention simplifies the structure of the driving circuit, has high driving efficiency, and simultaneously obtains the performance of easy self-starting.

Description

Self-excited BJT bridgeless Zeta PFC rectifier circuit

technical field

The invention relates to a PFC rectifier circuit, which is applied to high-quality electric energy conversion occasions of AC input and DC output, such as: micro energy collection system, new energy power generation system, battery charging system, LED lighting system, etc., especially a bridgeless ZetaPFC rectifier circuit.

Background technique

PFC rectifier circuit is a circuit with power factor correction (PFC) function that can convert AC power into DC power, which can improve the utilization rate of DC load to AC power and reduce the pollution of current harmonics to AC bus or AC power grid. .

The traditional ZetaPFC rectifier circuit is a PFC rectifier circuit, and its main circuit is generally composed of a bridge rectifier circuit cascaded with a Zeta circuit. In order to reduce the loss of the bridge rectifier circuit, a bridgeless ZetaPFC rectifier circuit came into being. The bridgeless zetaPFC rectifier circuit mainly achieves the purpose of improving circuit efficiency by reducing the number of conduction devices in the path.

In the early days, the BJT of Si material had disadvantages such as large driving loss, high switching loss, and large device dynamic impedance. Therefore, in order to obtain low power consumption, MOSFETs are mostly used in fully controlled devices in small and medium power bridgeless ZetaPFC rectifier circuits. However, the MOSFET is a voltage-type driving device, and compared with the current-type driving device BJT, the driving circuit of the MOSFET is more complicated than that of the BJT. Especially in the working environment of ultra-low voltage or high voltage, the design of MOSFET driving circuit is quite difficult.

Contents of the invention

In order to overcome the deficiencies of the existing MOSFET type bridgeless ZetaPFC rectifier circuit, the MOSFET drive circuit is complicated, the driving efficiency is low, and the self-starting performance is poor, the present invention provides a simplified driving circuit structure, high driving efficiency, and easy self-starting The performance of self-excited BJT bridgeless ZetaPFC rectifier circuit.

The technical solution adopted by the present invention to solve its technical problems is:

A self-excited BJT type bridgeless ZetaPFC rectifier circuit, including input capacitor Ci, PNP type BJT tube Q1, PNP type BJT tube Q2, NPN type BJT tube Q3, NPN type BJT tube Q4, PNP type BJT tube Q5, PNP type BJT tube Q6, diode D1, diode D2, inductor L1, inductor L2, capacitor Cs, output capacitor Co, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6 and used to control the PNP type BJT through port a The base current of tube Q1 realizes the control of the working state of PNP type BJT tube Q1 and controls the base current of PNP type BJT tube Q2 through port b so as to realize the controlled current source group of controlling the working state of PNP type BJT tube Q2 M1, one end of the input capacitor Ci is simultaneously connected to the positive end of the AC power supply vac, one end of the resistor R4, the emitter of the PNP type BJT tube Q1, the emitter of the PNP type BJT tube Q5, the emitter of the NPN type BJT tube Q3, and the resistor R2 One end of the PNP type BJT tube Q1 is connected to one end of the resistor R3, one end of the resistor R6, the collector of the PNP type BJT tube Q2, one end of the capacitor Cs, and one end of the inductor L1, and the other end of the capacitor Cs is connected at the same time It is connected to the cathode of diode D1 and the anode of diode D2, the cathode of diode D2 is connected to one end of inductor L2, and the other end of inductor L2 is connected to one end of output capacitor Co, the positive end of output voltage Vo and one end of load Z1, and the output The other end of the capacitor Co is connected to the negative end of the output voltage Vo, the other end of the load Z1, the anode of the diode D1, the other end of the inductor L1, the collector of the NPN BJT transistor Q3, and the collector of the NPN BJT transistor Q4. The emitter of the NPN type BJT tube Q4 is simultaneously connected with one end of the resistor R5, the emitter of the PNP type BJT tube Q6, the emitter of the PNP type BJT tube Q2, one end of the resistor R1, the other end of the input capacitor Ci, and the negative electrode of the AC power supply vac. The base of NPN BJT Q3 is connected to the other end of resistor R1, the base of NPN BJT Q4 is connected to the other end of resistor R4, and the base of PNP BJT Q5 is connected to the other end of resistor R2 And the other end of the resistor R3 is connected, the base of the PNP type BJT tube Q6 is connected with the other end of the resistor R5 and the other end of the resistor R6 at the same time, the base of the PNP type BJT tube Q1 is simultaneously connected with the collector of the PNP type BJT tube Q5 and The port a of the controlled current source group M1 is connected, and the base of the PNP type BJT transistor Q2 is connected to the collector of the PNP type BJT transistor Q6 and port b of the controlled current source group M1.

Further, both ends of the resistor R1 are connected in parallel with an accelerating capacitor C1, both ends of the resistor R3 are connected in parallel with an accelerating capacitor C2, both ends of the resistor R4 are connected in parallel with an accelerating capacitor C3, and both ends of the resistor R6 are connected in parallel with an accelerating capacitor C4. The solution can accelerate the dynamic characteristics of the self-excited BJT bridgeless ZetaPFC rectifier circuit.

Further, the controlled current source group M1 includes NPN type BJT tube Qa1, NPN type BJT tube Qa2, NPN type BJT tube Qa3, NPN type BJT tube Qa4, resistor Ra1, resistor Ra2, resistor Ra3, resistor Ra4, resistor Ra5 and resistor Ra6, the collector of NPN type BJT tube Qa1 is port a of controlled current source group M1, the collector of NPN type BJT tube Qa3 is port b of controlled current source group M1, and the emitter of NPN type BJT tube Qa1 At the same time, it is connected to one end of the resistor Ra2 and one end of the resistor Ra3, the base of the NPN type BJT tube Qa2 is connected to the other end of the resistor Ra2, and the collector of the NPN type BJT tube Qa2 is simultaneously connected to the base of the NPN type BJT tube Qa1 and the resistor Ra1 One end of the resistor Ra1 is connected to the positive end of the AC power supply vac, the emitter of the NPN BJT tube Qa3 is connected to one end of the resistor Ra5 and one end of the resistor Ra6 at the same time, the base of the NPN BJT tube Qa4 is connected to the resistor Ra5 The other end of the NPN BJT tube Qa4 is connected to the base of the NPN BJT tube Qa3 and one end of the resistor Ra4 at the same time, the other end of the resistor Ra4 is connected to the negative end of the AC power supply vac, and the NPN BJT tube Qa2 The emitter is simultaneously connected with the other end of the resistor Ra3, the other end of the resistor Ra6, the emitter of the NPN BJT transistor Qa4 and the negative end of the output voltage Vo. The self-excited BJT bridgeless ZetaPFC rectifier circuit has an input current limiting protection function.

Furthermore, the controlled current source group M1 includes NPN type BJT tube Qb1, NPN type BJT tube Qb2, NPN type BJT tube Qb3, NPN type BJT tube Qb4, resistor Rb1, resistor Rb2, resistor Rb3, resistor Rb4, resistor Rb5 , resistor Rb6, resistor Rb7, resistor Rb8 and capacitor Cb1, one end of resistor Rb3 is port a of controlled current source group M1, one end of resistor Rb6 is port b of controlled current source group M1, the other end of resistor Rb3 is connected to NPN The collector of the NPN type BJT tube Qb1 is connected, the base of the NPN type BJT tube Qb1 is connected with one end of the resistor Rb2, the other end of the resistor Rb2 is connected with one end of the resistor Rb1 and the collector of the NPN type BJT tube Qb2, and the other end of the resistor Rb1 One end is connected to the positive end of the AC power supply vac, the other end of the resistor Rb6 is connected to the collector of the NPN type BJT tube Qb3, the base of the NPN type BJT tube Qb3 is connected to one end of the resistor Rb5, and the other end of the resistor Rb5 is connected to the resistor Rb4 at the same time One end of the resistor Rb4 is connected to the collector of the NPN type BJT tube Qb4, the other end of the resistor Rb4 is connected to the negative end of the AC power supply vac, the base of the NPN type BJT tube Qb2 is simultaneously connected to the base of the NPN type BJT tube Qb4 and one end of the capacitor Cb1 , One end of the resistor Rb8 and one end of the resistor Rb7 are connected, the other end of the resistor Rb7 is connected to the positive end of the output voltage Vo, the emitter of the NPN BJT tube Qb1 is simultaneously connected with the emitter of the NPN BJT tube Qb3, and the NPN BJT tube Qb2 The emitter of the NPN type BJT transistor Qb4, the other end of the capacitor Cb1, the other end of the resistor Rb8 and the negative end of the output voltage Vo are connected. The self-excited BJT bridgeless ZetaPFC rectifier circuit has an output voltage stabilizing function.

The technical idea of the present invention is: with the development of new semiconductor material devices, the BJT of new materials (such as SiC) has shown smaller drive loss, very low resistivity, faster switching speed, lower temperature Dependence, good short-circuit capability and no secondary breakdown and many other advantages. Using new material BJT in small and medium power bridgeless ZetaPFC rectifier circuit can not only obtain low power consumption, but also simplify the driving circuit of fully controlled devices.

The fully controlled device in the bridgeless ZetaPFC rectifier circuit adopts BJT, which can realize simple circuit, high efficiency, easy self-starting and other performances at the same time by using the advantages of BJT working performance and self-excited circuit technology.

The beneficial effects of the present invention are mainly manifested in that the self-excited BJT bridgeless ZetaPFC rectifier circuit has the ability to convert AC power into DC power with high quality, and the output DC voltage can be greater than, less than or equal to the amplitude of the input AC voltage, The circuit is simple, the driving efficiency is high, the self-starting is easy, and it is suitable for various control methods.

Description of drawings

Fig. 1 is a schematic diagram of the basic circuit structure of the present invention.

Fig. 2 is a schematic diagram of the circuit structure of the accelerated dynamic characteristic of the present invention.

Fig. 3 is a circuit diagram of Embodiment 1 of the present invention.

Fig. 4 is a circuit diagram of Embodiment 2 of the present invention.

Fig. 5 is a simulation working waveform diagram of Embodiment 1 of the present invention.

Fig. 6 is a detailed diagram of the simulated working waveform of Embodiment 1 of the present invention.

Fig. 7 is a simulation working waveform diagram of Embodiment 2 of the present invention.

Fig. 8 is a detailed diagram of the simulated working waveform of Embodiment 2 of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings.

Referring to Figure 1 and Figure 2, a self-excited BJT bridgeless ZetaPFC rectifier circuit, including input capacitor Ci, PNP type BJT tube Q1, PNP type BJT tube Q2, NPN type BJT tube Q3, NPN type BJT tube Q4, PNP Type BJT tube Q5, PNP type BJT tube Q6, diode D1, diode D2, inductor L1, inductor L2, capacitor Cs, output capacitor Co, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6 and for Control the base current of PNP type BJT tube Q1 through port a to realize the control of the working state of PNP type BJT tube Q1 and control the base current of PNP type BJT tube Q2 through port b to realize the control of the working state of PNP type BJT tube Q2 Controlled current source group M1, one end of the input capacitor Ci is simultaneously connected to the positive end of the AC power supply vac, one end of the resistor R4, the emitter of the PNP type BJT tube Q1, the emitter of the PNP type BJT tube Q5, and the NPN type BJT tube The emitter of Q3 is connected to one end of resistor R2, and the collector of PNP type BJT tube Q1 is connected to one end of resistor R3, one end of resistor R6, the collector of PNP type BJT tube Q2, one end of capacitor Cs and one end of inductor L1. , the other end of the capacitor Cs is connected to the cathode of the diode D1 and the anode of the diode D2 at the same time, the cathode of the diode D2 is connected to one end of the inductor L2, and the other end of the inductor L2 is simultaneously connected to one end of the output capacitor Co, the positive end of the output voltage Vo and One end of the load Z1 is connected, and the other end of the output capacitor Co is simultaneously connected to the negative end of the output voltage Vo, the other end of the load Z1, the anode of the diode D1, the other end of the inductor L1, the collector of the NPN BJT transistor Q3, and the NPN BJT The collector of the tube Q4 is connected, and the emitter of the NPN type BJT tube Q4 is simultaneously connected with one end of the resistor R5, the emitter of the PNP type BJT tube Q6, the emitter of the PNP type BJT tube Q2, one end of the resistor R1, and the other end of the input capacitor Ci. One end is connected to the negative end of the AC power supply vac, the base of the NPN BJT Q3 is connected to the other end of the resistor R1, the base of the NPN BJT Q4 is connected to the other end of the resistor R4, and the base of the PNP BJT Q5 At the same time, it is connected to the other end of the resistor R2 and the other end of the resistor R3. The base of the PNP type BJT tube Q6 is connected to the other end of the resistor R5 and the other end of the resistor R6 at the same time. The base of the PNP type BJT tube Q1 is connected to the PNP type BJT tube Q1 at the same time. The collector of the BJT transistor Q5 is connected to port a of the controlled current source group M1, and the base of the PNP type BJT transistor Q2 is connected to the collector of the PNP type BJT transistor Q6 and port b of the controlled current source group M1.

Further, both ends of the resistor R1 are connected in parallel with an accelerating capacitor C1, both ends of the resistor R3 are connected in parallel with an accelerating capacitor C2, both ends of the resistor R4 are connected in parallel with an accelerating capacitor C3, and both ends of the resistor R6 are connected in parallel with an accelerating capacitor C4. The solution can accelerate the dynamic characteristics of the self-excited BJT bridgeless ZetaPFC rectifier circuit.

Embodiment 1: Referring to Fig. 1, Fig. 3, Fig. 5 and Fig. 6, Embodiment 1 of the present invention has the function of input current limiting protection, which consists of input capacitor Ci, PNP type BJT tube Q1, PNP type BJT tube Q2, NPN type BJT tube Q3, NPN type BJT tube Q4, PNP type BJT tube Q5, PNP type BJT tube Q6, diode D1, diode D2, inductor L1, inductor L2, capacitor Cs, output capacitor Co, resistor R1, resistor R2, resistor R3, Composed of resistor R4, resistor R5, resistor R6, and controlled current source group M1. Among them, the controlled current source M1 is composed of NPN type BJT tube Qa1, NPN type BJT tube Qa2, NPN type BJT tube Qa3, NPN type BJT tube Qa4, resistor Ra1, resistor Ra2, resistor Ra3, resistor Ra4, resistor Ra5, resistor Ra6 composition.

As shown in Figure 3, one end of the input capacitor Ci is simultaneously connected to the positive end of the AC power supply vac, one end of the resistor R4, the emitter of the PNP BJT transistor Q1, the emitter of the PNP BJT transistor Q5, and the emitter of the NPN BJT transistor Q3. pole and one end of resistor R2, the collector of PNP type BJT tube Q1 is connected with one end of resistor R3, one end of resistor R6, the collector of PNP type BJT tube Q2, one end of capacitor Cs and one end of inductor L1, and the capacitor Cs The other end of the diode D1 is connected to the cathode of the diode D1 and the anode of the diode D2 at the same time, the cathode of the diode D2 is connected to one end of the inductor L2, and the other end of the inductor L2 is connected to one end of the output capacitor Co, the positive end of the output voltage Vo and the load Z1. One end is connected, and the other end of the output capacitor Co is simultaneously connected to the negative end of the output voltage Vo, the other end of the load Z1, the anode of the diode D1, the other end of the inductor L1, the collector of the NPN BJT transistor Q3, and the NPN BJT transistor Q4. The collector is connected, and the emitter of the NPN BJT tube Q4 is connected to one end of the resistor R5, the emitter of the PNP BJT tube Q6, the emitter of the PNP BJT tube Q2, one end of the resistor R1, and the other end of the input capacitor Ci. The negative terminal of the power supply vac is connected, the base of NPN BJT Q3 is connected to the other end of resistor R1, the base of NPN BJT Q4 is connected to the other end of resistor R4, and the base of PNP BJT Q5 is connected to the other end of resistor R1. The other end of R2 is connected to the other end of resistor R3, the base of PNP type BJT tube Q6 is connected to the other end of resistor R5 and the other end of resistor R6 at the same time, the base of PNP type BJT tube Q1 is connected to PNP type BJT tube Q5 at the same time The collector of the controlled current source group M1 is connected to the port a, the base of the PNP type BJT tube Q2 is connected to the collector of the PNP type BJT tube Q6 and the port b of the controlled current source group M1, and the NPN type BJT tube Qa1 The collector of the NPN type BJT tube Qa1 is the port a of the controlled current source group M1, the collector of the NPN type BJT tube Qa3 is the port b of the controlled current source group M1, and the emitter of the NPN type BJT tube Qa1 is simultaneously connected to one end of the resistor Ra2 and the resistor Ra3 One end of the NPN BJT tube Qa2 is connected to the other end of the resistor Ra2, the collector of the NPN BJT tube Qa2 is connected to the base of the NPN BJT tube Qa1 and one end of the resistor Ra1, and the other end of the resistor Ra1 Connected to the positive end of the AC power supply vac, the emitter of the NPN BJT tube Qa3 is connected to one end of the resistor Ra5 and one end of the resistor Ra6 at the same time, the base of the NPN BJT tube Qa4 is connected to the other end of the resistor Ra5, and the NPN BJT tube The collector of Qa4 is connected to the base of NPN BJT tube Qa3 and one end of resistor Ra4 at the same time, the other end of resistor Ra4 is connected to the negative end of AC power supply vac, and the emitter of NPN BJT tube Qa2 is connected to the other end of resistor Ra3 at the same time , resistance Ra6 The other end of the NPN type BJT tube Qa4 emitter and the negative end of the output voltage Vo are connected.

Fig. 5 is the simulated working waveform figure of embodiment 1 of the present invention, and Fig. 6 is the detailed figure of simulated working waveform of embodiment 1 of the present invention, and its steady-state operating principle is as follows:

When vac>0, the AC power supply vac is in the positive half cycle (ie ta2<t<ta3); when vac<0, the AC power supply vac is in the negative half cycle (ie ta1<t<ta2). Q4 is turned on in the positive half cycle of the AC power supply vac and cut off in the negative half cycle, and Q3 is turned off in the positive half cycle of the AC power supply vac and turned on in the negative half cycle.

(1) During the positive half cycle of the AC power supply vac, Q2 cuts off and Q1 works self-excitedly

When Q1 is turned on (that is, ta21<t<ta22), vac, Q1, L1, and Q4 form a loop, vac, Q1, Cs, D2, L2, Co, Z1, and Q4 form another loop, L1 is magnetized, and the input The current iac, the current iL1 of L1, and the collector current iQc1 of Q1 all increase, Cs discharges, the capacitor voltage VCs decreases, L2 is magnetized, and the current iL2 of L2 increases. With the increase of iQc1, the working state of Q1 gradually shifts from the saturation region to the amplification region and the cut-off region under the action of Q5 and the port a of the controlled current source group M1. At the moment when Q1 just enters the cut-off state from the conduction state,

$\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; \&ap;</span>\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; v</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; V</span>}\mathrm{<span\; class="notranslate">\; B</span>}\mathrm{<span\; class="notranslate">\; E.</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; Q</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; \&beta;</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; Q</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; R</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; \&beta;</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; Q</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; \&beta;</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; Q</span>}\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; ,</span>\frac{\mathrm{<span\; class="notranslate">\; V</span>}\mathrm{<span\; class="notranslate">\; B</span>}\mathrm{<span\; class="notranslate">\; E.</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; Q</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; 2</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; 3</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; \&beta;</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; Q</span>}\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ,</span>$

Where max() is the maximum value function, VBE_Qa1 is the base-emitter conduction voltage drop of Qa1, VBE_Qa2 is the base-emitter conduction voltage drop of Qa2, β_Qa1 is the common emitter current gain of Qa1, β_Q1 is Common emitter current gain of Q1. When Q1 is cut off (that is, ta22<t<ta23), L1, D1, and Cs form a loop, and D2, L2, Co, Z1, and D1 form another loop. L1 demagnetizes, and the current iL1 of L1 decreases, and Cs charges. The capacitor voltage VCs increases, L2 demagnetizes, and the current iL2 of L2 decreases. When the current iD1 of D1 decreases to zero, D1 is cut off, Q1 is turned on again, and the cycle repeats.

(2) During the negative half cycle of the AC power supply vac, Q1 is cut off, and Q2 works self-excitedly

Similarly, when Q2 is turned on, vac, Q2, L1, and Q3 form a loop, vac, Q2, Cs, D2, L2, Co, Z1, and Q3 form another loop, L1 is magnetized, and the input current iac increases in reverse , the current iL1 of L1 and the collector current iQc2 of Q2 increase positively, Cs discharges, the capacitor voltage VCs decreases, L2 is magnetized, and the current iL2 of L2 increases. With the increase of iQc2, under the action of Q6 and the port b of the controlled current source group M1, the working state of Q2 gradually shifts from the saturation region to the amplification region and cut-off region. At the moment when Q2 just enters the cut-off state from the conduction state,

$<span\; class="notranslate">\; |</span>\mathrm{<span\; class="notranslate">\; i</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; \&ap;</span>\mathrm{<span\; class="notranslate">\; m</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; x</span>}<span\; class="notranslate">\; (</span>\frac{<span\; class="notranslate">\; |</span>\mathrm{<span\; class="notranslate">\; v</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; c</span>}<span\; class="notranslate">\; |</span><span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; V</span>}\mathrm{<span\; class="notranslate">\; B</span>}\mathrm{<span\; class="notranslate">\; E.</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; Q</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; 3</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; 4</span>}<span\; class="notranslate">\; +</span>\mathrm{<span\; class="notranslate">\; \&beta;</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; Q</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; 3</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; R</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; 6</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; \&beta;</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; Q</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; 3.</span>}\mathrm{<span\; class="notranslate">\; \&beta;</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; Q</span>}\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; ,</span>\frac{\mathrm{<span\; class="notranslate">\; V</span>}\mathrm{<span\; class="notranslate">\; B</span>}\mathrm{<span\; class="notranslate">\; E.</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; Q</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; 4</span>}}{\mathrm{<span\; class="notranslate">\; R</span>}\mathrm{<span\; class="notranslate">\; a</span>}\mathrm{<span\; class="notranslate">\; 6</span>}}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; \&beta;</span>}<span\; class="notranslate">\; \_</span>\mathrm{<span\; class="notranslate">\; Q</span>}\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; ,</span>$

Among them, max() is the maximum value function, VBE_Qa3 is the base-emitter conduction voltage drop of Qa3, VBE_Qa4 is the base-emitter conduction voltage drop of Qa4, β_Qa3 is the common emitter current gain of Qa3, β_Q2 is Common emitter current gain of Q2. When Q2 is cut off, L1, D1, and Cs form a loop, D2, L2, Co, Z1, and D1 form another loop, L1 demagnetizes, the current iL1 of L1 decreases, Cs charges, the capacitor voltage VCs increases, and L2 demagnetizes , the current iL2 of L2 decreases. When the current iD1 of D1 decreases to zero, D1 is cut off, Q2 is turned on again, and the cycle repeats.

It can be known from the above that the peak value of the input current iac in Embodiment 1 of the present invention is limited by the controlled current source group M1.

Embodiment 2: With reference to Fig. 1, Fig. 4, Fig. 7 and Fig. 8, Embodiment 2 of the present invention has output voltage stabilizing function, and it is composed of input capacitor Ci, PNP type BJT tube Q1, PNP type BJT tube Q2, NPN type BJT tube Q3, NPN type BJT tube Q4, PNP type BJT tube Q5, PNP type BJT tube Q6, diode D1, diode D2, inductor L1, inductor L2, capacitor Cs, output capacitor Co, resistor R1, resistor R2, resistor R3, resistor R4 , resistor R5, resistor R6, and controlled current source group M1. Among them, the controlled current source group M1 is composed of NPN type BJT tube Qb1, NPN type BJT tube Qb2, NPN type BJT tube Qb3, NPN type BJT tube Qb4, resistor Rb1, resistor Rb2, resistor Rb3, resistor Rb4, resistor Rb5, resistor Composed of Rb6, resistor Rb7, resistor Rb8, and capacitor Cb1.

As shown in Figure 4, one end of the input capacitor Ci is simultaneously connected to the positive end of the AC power supply vac, one end of the resistor R4, the emitter of the PNP BJT transistor Q1, the emitter of the PNP BJT transistor Q5, and the emitter of the NPN BJT transistor Q3. pole and one end of resistor R2, the collector of PNP type BJT tube Q1 is connected with one end of resistor R3, one end of resistor R6, the collector of PNP type BJT tube Q2, one end of capacitor Cs and one end of inductor L1, and the capacitor Cs The other end of the diode D1 is connected to the cathode of the diode D1 and the anode of the diode D2 at the same time, the cathode of the diode D2 is connected to one end of the inductor L2, and the other end of the inductor L2 is connected to one end of the output capacitor Co, the positive end of the output voltage Vo and the load Z1. One end is connected, and the other end of the output capacitor Co is simultaneously connected to the negative end of the output voltage Vo, the other end of the load Z1, the anode of the diode D1, the other end of the inductor L1, the collector of the NPN BJT transistor Q3, and the NPN BJT transistor Q4. The collector is connected, and the emitter of the NPN BJT tube Q4 is connected to one end of the resistor R5, the emitter of the PNP BJT tube Q6, the emitter of the PNP BJT tube Q2, one end of the resistor R1, and the other end of the input capacitor Ci. The negative terminal of the power supply vac is connected, the base of NPN BJT Q3 is connected to the other end of resistor R1, the base of NPN BJT Q4 is connected to the other end of resistor R4, and the base of PNP BJT Q5 is connected to the other end of resistor R1. The other end of R2 is connected to the other end of resistor R3, the base of PNP type BJT tube Q6 is connected to the other end of resistor R5 and the other end of resistor R6 at the same time, the base of PNP type BJT tube Q1 is connected to PNP type BJT tube Q5 at the same time The collector of the controlled current source group M1 is connected to the port a, the base of the PNP type BJT transistor Q2 is connected to the collector of the PNP type BJT transistor Q6 and the port b of the controlled current source group M1 at the same time, and one end of the resistor Rb3 is Port a of the controlled current source group M1, one end of the resistor Rb6 is port b of the controlled current source group M1, the other end of the resistor Rb3 is connected to the collector of the NPN type BJT transistor Qb1, and the base of the NPN type BJT transistor Qb1 is connected to One end of the resistor Rb2 is connected, the other end of the resistor Rb2 is connected with one end of the resistor Rb1 and the collector of the NPN type BJT tube Qb2, the other end of the resistor Rb1 is connected with the positive end of the AC power supply vac, and the other end of the resistor Rb6 is connected with the NPN type BJT tube Qb2. The collector of BJT tube Qb3 is connected, the base of NPN type BJT tube Qb3 is connected with one end of resistor Rb5, the other end of resistor Rb5 is connected with one end of resistor Rb4 and the collector of NPN type BJT tube Qb4, and the other end of resistor Rb4 Connected to the negative terminal of the AC power supply vac, the base of the NPN BJT tube Qb2 is connected to the base of the NPN BJT tube Qb4, one end of the capacitor Cb1, one end of the resistor Rb8 and one end of the resistor Rb7, and the other end of the resistor Rb7 is connected to the negative terminal of the AC power supply vac. The positive terminal of the output voltage Vo The emitter of the NPN BJT tube Qb1 is connected with the emitter of the NPN BJT tube Qb3, the emitter of the NPN BJT tube Qb2, the emitter of the NPN BJT tube Qb4, the other end of the capacitor Cb1, and the other end of the resistor Rb8 And the negative end of the output voltage Vo is connected.

Fig. 7 is the simulation work wave form figure of embodiment 2 of the present invention, and Fig. 8 is the simulation work wave form detail figure of embodiment 2 of the present invention, and its steady-state working principle is as follows:

When vac>0, the AC power supply vac is in the positive half cycle (ie tb2<t<tb3); when vac<0, the AC power supply vac is in the negative half cycle (ie tb1<t<tb2). Q4 is turned on in the positive half cycle of the AC power supply vac and cut off in the negative half cycle, and Q3 is turned off in the positive half cycle of the AC power supply vac and turned on in the negative half cycle.

(1) During the negative half cycle of the AC power supply vac, Q1 is cut off, and Q2 works self-excitedly

When Q2 is turned on (that is, tb11<t<tb12), vac, Q2, L1, and Q3 form a loop, vac, Q2, Cs, D2, L2, Co, Z1, and Q3 form another loop, L1 is magnetized, and the input The current iac increases in reverse, the current iL1 of L1 and the collector current iQc2 of Q2 increase positively, Cs is discharged, the capacitor voltage VCs decreases, L2 is magnetized, and the current iL2 of L2 increases. With the increase of iQc2, under the action of Q6 and the port b of the controlled current source group M1, the working state of Q2 gradually shifts from the saturation region to the amplification region and cut-off region. When Q2 is cut off (ie tb12<t<tb13), L1, D1, and Cs form a loop, and D2, L2, Co, Z1, and D1 form another loop. L1 demagnetizes, and the current iL1 of L1 decreases, and Cs is charged. The capacitor voltage VCs increases, L2 demagnetizes, and the current iL2 of L2 decreases. When the current iD1 of D1 decreases to zero, D1 is cut off, Q2 is turned on again, and the cycle repeats.

VBE_Qb is the base-emitter turn-on voltage drop of Qb4 and Qb2. when When , the controlled current source group M1 reduces the base current of Q2 through port b, shortens the turn-on time of Q2, and even prolongs the turn-off time of Q2, so that Vo falls back. when When , the controlled current source group M1 maximizes the base current of Q2 through port b, and maximizes the conduction time of Q2, so that Vo rises.

(2) During the positive half cycle of the AC power supply vac, Q2 is cut off, and Q1 works self-excitedly

Similarly, when Q1 is turned on, vac, Q1, L1, and Q4 form a loop, vac, Q1, Cs, D2, L2, Co, Z1, and Q4 form another loop, L1 is magnetized, and the input current iac, L1 The current iL1 and the collector current iQc1 of Q1 both increase, Cs discharges, the capacitor voltage VCs decreases, L2 is magnetized, and the current iL2 of L2 increases. With the increase of iQc1, the working state of Q1 gradually shifts from the saturation region to the amplification region and the cut-off region under the action of Q5 and the port a of the controlled current source group M1. When Q1 is turned off, L1, D1, and Cs form a loop, and D2, L2, Co, Z1, and D1 form another loop. L1 demagnetizes, and the current iL1 of L1 decreases, Cs charges, the capacitor voltage VCs increases, and L2 demagnetizes , the current iL2 of L2 decreases. When the current iD1 of D1 decreases to zero, D1 is cut off, Q1 is turned on again, and the cycle repeats.

VBE_Qb is the base-emitter turn-on voltage drop of Qb2 and Qb4. when When , the controlled current source group M1 reduces the base current of Q1 through port a, shortens the on-time of Q1, and even prolongs the off-time of Q1, so that Vo falls back. when When , the controlled current source group M1 maximizes the base current of Q1 through port a, maximizes the conduction time of Q1, and makes Vo rise.

It can be known from the above that the output voltage Vo of Embodiment 2 of the present invention can be stabilized under the regulation of the controlled current source group M1.

The content described in the embodiments of this specification is only an enumeration of the implementation forms of the inventive concept. The protection scope of the present invention should not be regarded as limited to the specific forms stated in the embodiments. The protection scope of the present invention also extends to the field Equivalent technical means that the skilled person can think of based on the concept of the present invention.

Claims (4)

1. A self-excited BJT type bridgeless ZetaPFC rectifier circuit, characterized in that it includes input capacitor Ci, PNP type BJT tube Q1, PNP type BJT tube Q2, NPN type BJT tube Q3, NPN type BJT tube Q4, PNP type BJT tube Q5, PNP type BJT tube Q6, diode D1, diode D2, inductor L1, inductor L2, capacitor Cs, output capacitor Co, resistor R1, resistor R2, resistor R3, resistor R4, resistor R5, resistor R6 and for passing Port a controls the base current of PNP-type BJT tube Q1 to realize the control of the working state of PNP-type BJT tube Q1 and controls the base current of PNP-type BJT tube Q2 through port b to realize the control of the working state of PNP-type BJT tube Q2 The controlled current source group M1 of the input capacitor Ci is simultaneously connected with the positive terminal of the AC power supply vac, one end of the resistor R4, the emitter of the PNP type BJT tube Q1, the emitter of the PNP type BJT tube Q5, and the NPN type BJT tube Q3 The emitter of the transistor and one end of the resistor R2 are connected, and the collector of the PNP type BJT tube Q1 is simultaneously connected with one end of the resistor R3, one end of the resistor R6, the collector of the PNP type BJT tube Q2, one end of the capacitor Cs, and one end of the inductor L1. The other end of the capacitor Cs is connected to the cathode of the diode D1 and the anode of the diode D2 at the same time, the cathode of the diode D2 is connected to one end of the inductor L2, and the other end of the inductor L2 is connected to one end of the output capacitor Co, the positive end of the output voltage Vo and the load One end of Z1 is connected, and the other end of the output capacitor Co is simultaneously connected to the negative end of the output voltage Vo, the other end of the load Z1, the anode of the diode D1, the other end of the inductor L1, the collector of the NPN BJT tube Q3, and the NPN BJT tube The collector of Q4 is connected, the emitter of NPN type BJT tube Q4 is connected with one end of resistor R5, the emitter of PNP type BJT tube Q6, the emitter of PNP type BJT tube Q2, one end of resistor R1, and the other end of input capacitor Ci , The negative terminal of the AC power supply vac is connected, the base of the NPN type BJT type Q3 is connected with the other end of the resistor R1, the base of the NPN type BJT tube Q4 is connected with the other end of the resistor R4, and the base of the PNP type BJT tube Q5 is connected at the same time Connected to the other end of the resistor R2 and the other end of the resistor R3, the base of the PNP type BJT tube Q6 is connected to the other end of the resistor R5 and the other end of the resistor R6 at the same time, and the base of the PNP type BJT tube Q1 is connected to the PNP type BJT The collector of the transistor Q5 is connected to the port a of the controlled current source group M1, and the base of the PNP type BJT transistor Q2 is connected to the collector of the PNP type BJT transistor Q6 and the port b of the controlled current source group M1. 2. The self-excited BJT type bridgeless ZetaPFC rectifier circuit as claimed in claim 1, characterized in that: the two ends of the resistor R1 are connected in parallel with the accelerating capacitor C1, the two ends of the resistor R3 are connected in parallel with the accelerating capacitor C2, and the two ends of the resistor R4 are connected in parallel with the accelerating capacitor C3 , the two ends of the resistor R6 are connected in parallel with the accelerating capacitor C4. 3. The self-excited BJT type bridgeless ZetaPFC rectifier circuit according to claim 1 or 2, characterized in that: the controlled current source group M1 includes NPN type BJT tube Qa1, NPN type BJT tube Qa2, NPN type BJT Tube Qa3, NPN type BJT tube Qa4, resistor Ra1, resistor Ra2, resistor Ra3, resistor Ra4, resistor Ra5 and resistor Ra6, the collector of NPN type BJT tube Qa1 is port a of controlled current source group M1, NPN type BJT tube The collector of Qa3 is the port b of the controlled current source group M1, the emitter of the NPN BJT tube Qa1 is connected to one end of the resistor Ra2 and one end of the resistor Ra3 at the same time, the base of the NPN BJT tube Qa2 is connected to the other end of the resistor Ra2 The collector of the NPN BJT tube Qa2 is connected to the base of the NPN BJT tube Qa1 and one end of the resistor Ra1 at the same time, the other end of the resistor Ra1 is connected to the positive end of the AC power supply vac, and the emitter of the NPN BJT tube Qa3 is simultaneously It is connected with one end of resistor Ra5 and one end of resistor Ra6, the base of NPN BJT transistor Qa4 is connected with the other end of resistor Ra5, and the collector of NPN BJT transistor Qa4 is connected with the base of NPN BJT transistor Qa3 and the resistor Ra4 at the same time. One end is connected, the other end of the resistor Ra4 is connected to the negative end of the AC power supply vac, the emitter of the NPN type BJT tube Qa2 is simultaneously connected with the other end of the resistor Ra3, the other end of the resistor Ra6, the emitter of the NPN type BJT tube Qa4 and the output voltage The negative end of Vo is connected. 4. The self-excited BJT type bridgeless ZetaPFC rectifier circuit according to claim 1 or 2, characterized in that: said controlled current source group M1 includes NPN type BJT tube Qb1, NPN type BJT tube Qb2, NPN type BJT Tube Qb3, NPN type BJT tube Qb4, resistor Rb1, resistor Rb2, resistor Rb3, resistor Rb4, resistor Rb5, resistor Rb6, resistor Rb7, resistor Rb8 and capacitor Cb1, one end of resistor Rb3 is port a of controlled current source group M1 , one end of the resistor Rb6 is the port b of the controlled current source group M1, the other end of the resistor Rb3 is connected to the collector of the NPN type BJT tube Qb1, the base of the NPN type BJT tube Qb1 is connected to one end of the resistor Rb2, and the resistor Rb2 The other end is connected to one end of the resistor Rb1 and the collector of the NPN type BJT tube Qb2 at the same time, the other end of the resistor Rb1 is connected to the positive end of the AC power supply vac, and the other end of the resistor Rb6 is connected to the collector of the NPN type BJT tube Qb3, NPN The base of the type BJT tube Qb3 is connected to one end of the resistor Rb5, and the other end of the resistor Rb5 is connected to one end of the resistor Rb4 and the collector of the NPN type BJT tube Qb4 at the same time, and the other end of the resistor Rb4 is connected to the negative end of the AC power supply vac. The base of the NPN BJT tube Qb2 is simultaneously connected to the base of the NPN BJT tube Qb4, one end of the capacitor Cb1, one end of the resistor Rb8, and one end of the resistor Rb7, and the other end of the resistor Rb7 is connected to the positive end of the output voltage Vo. NPN The emitter of the NPN type BJT tube Qb1 is simultaneously connected with the emitter of the NPN type BJT tube Qb3, the emitter of the NPN type BJT tube Qb2, the emitter of the NPN type BJT tube Qb4, the other end of the capacitor Cb1, the other end of the resistor Rb8 and the output voltage The negative end of Vo is connected.