CN205070824U - Auto -excitation type BJT type does not have bridge buck PFC rectifier circuit - Google Patents

Abstract

The utility model provides an auto -excitation type BJT type does not have bridge buck PFC rectifier circuit, including input capacitance ci, PNP type BJT manages Q1, PNP type BJT manages Q2, NPN type BJT manages Q3, NPN type BJT manages Q4, PNP type BJT manages Q5, PNP type BJT manages Q6, diode D1, inductance L1, output capacitance co, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, thereby thereby resistance R6 with be used for base current through its port a control PNP type BJT pipe Q1 to realize realizing the M1 of controlled current source group to PNP type BJT pipe Q2 operating condition's control to PNP type BJT pipe Q1 operating condition's control and the base current through its port b control PNP type BJT pipe Q2. The utility model discloses simplify drive circuit structure, higher, the easy self -starting performance of acquisition simultaneously of drive efficiency.

Description

Auto-excitation type BJT type is without bridge Buck PFC rectification circuit

Technical field

The utility model relates to PFC rectification circuit, be applied to the high-quality transformation of electrical energy occasion exchanging input, direct current output, as: micro-energy collecting system, grid-connected power generation system, battery charging system, LED illumination System etc., especially a kind of without bridge BuckPFC rectification circuit.

Background technology

PFC rectification circuit is the circuit that AC energy can be converted to direct current energy that one has power factor correction (PFC) function, can improve DC load to the utilance of AC power and reduce the pollution of current harmonics to ac bus or AC network.

Traditional B uckPFC rectification circuit is a kind of PFC rectification circuit, and its main circuit is generally formed by bridge rectifier cascade Buck circuit.In order to reduce the loss of bridge rectifier, arise at the historic moment without bridge BuckPFC rectification circuit.Reach the object promoting circuit efficiency mainly through the way reducing conduction device number in path without bridge BuckPFC rectification circuit.

In early days, the BJT of Si material has the shortcomings such as larger driving loss, higher switching loss, larger device dynamic impedance.Therefore, in order to obtain low-power consumption, middle low power mostly adopt MOSFET without the wholly-controled device in bridge BuckPFC rectification circuit.But MOSFET is voltage mode driver part, compared with current mode drive device BJT, the drive circuit of MOSFET is more complicated than the drive circuit of BJT.Especially, in the operational environment of ultralow pressure or high pressure, the design difficulty of MOSFET drive circuit is quite large.

Summary of the invention

In order to overcome, existing MOSFET type is complicated without MOSFET drive circuit in bridge BuckPFC rectification circuit, drive efficiency is lower, the deficiency of self-starting poor-performing, and the utility model provides a kind of and simplifies that driving circuit structure, drive efficiency are higher, the auto-excitation type BJT type that simultaneously obtains easy self-starting performance is without bridge BuckPFC rectification circuit.

The utility model solves the technical scheme that its technical problem adopts:

A kind of auto-excitation type BJT type, without bridge BuckPFC rectification circuit, comprises input capacitance Ci, positive-negative-positive BJT pipe Q1, positive-negative-positive BJT pipe Q2, NPN type BJT pipe Q3, NPN type BJT pipe Q4, positive-negative-positive BJT pipe Q5, positive-negative-positive BJT pipe Q6, diode D1, inductance L 1, output capacitance Co, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6 and for the base current that controlled positive-negative-positive BJT pipe Q1 by port a thus realize to the control of positive-negative-positive BJT pipe Q1 operating state and control the base current of positive-negative-positive BJT pipe Q2 by port b thus one end of the controlled current source group M1 realized the control of positive-negative-positive BJT pipe Q2 operating state, input capacitance Ci simultaneously with the anode of AC power vac, one end of resistance R4, the emitter of positive-negative-positive BJT pipe Q1, the emitter of positive-negative-positive BJT pipe Q5, the emitter of NPN type BJT pipe Q3 and one end of resistance R2 are connected, the collector electrode of positive-negative-positive BJT pipe Q1 simultaneously with one end of resistance R3, one end of resistance R6, the collector electrode of positive-negative-positive BJT pipe Q2, the negative electrode of diode D1 and one end of inductance L 1 are connected, the other end of inductance L 1 simultaneously with one end of output capacitance Co, the anode of output voltage Vo and one end of load Z1 are connected, the other end of output capacitance Co simultaneously with the negative terminal of output voltage Vo, the other end of load Z1, the anode of diode D1, the collector electrode of NPN type BJT pipe Q3 and the collector electrode of NPN type BJT pipe Q4 are connected, the emitter of NPN type BJT pipe Q4 simultaneously with one end of resistance R5, the emitter of positive-negative-positive BJT pipe Q6, the emitter of positive-negative-positive BJT pipe Q2, one end of resistance R1, the other end of input capacitance Ci and the negative terminal of AC power vac are connected, the base stage of NPN type BJT type Q3 is connected with the other end of resistance R1, the base stage of NPN type BJT pipe Q4 is connected with the other end of resistance R4, the base stage of positive-negative-positive BJT pipe Q5 is connected with the other end of resistance R2 and the other end of resistance R3 simultaneously, the base stage of positive-negative-positive BJT pipe Q6 is connected with the other end of resistance R5 and the other end of resistance R6 simultaneously, the base stage of positive-negative-positive BJT pipe Q1 is connected with the collector electrode of positive-negative-positive BJT pipe Q5 and the port a of controlled current source group M1 simultaneously, and the base stage of positive-negative-positive BJT pipe Q2 is connected with the collector electrode of positive-negative-positive BJT pipe Q6 and the port b of controlled current source group M1 simultaneously.

Further, speed-up capacitor C2, resistance R4 two ends in parallel, speed-up capacitor C1, resistance R3 two ends in parallel, resistance R1 two ends speed-up capacitor C3, resistance R6 two ends in parallel speed-up capacitor C4 in parallel.This preferred scheme accelerates the dynamic characteristic of described auto-excitation type BJT type without bridge BuckPFC rectification circuit.

Further again, described controlled current source group M1 comprises NPN type BJT pipe Qa1, NPN type BJT pipe Qa2, NPN type BJT pipe Qa3, NPN type BJT pipe Qa4, resistance Ra1, resistance Ra2, resistance Ra3, resistance Ra4, resistance Ra5 and resistance Ra6, the port a of the current collection of NPN type BJT pipe Qa1 very controlled current source group M1, the port b of the current collection of NPN type BJT pipe Qa3 very controlled current source group M1, the emitter of NPN type BJT pipe Qa1 is connected with one end of resistance Ra2 and one end of resistance Ra3 simultaneously, the base stage of NPN type BJT pipe Qa2 is connected with the other end of resistance Ra2, the collector electrode of NPN type BJT pipe Qa2 is connected with the base stage of NPN type BJT pipe Qa1 and one end of resistance Ra1 simultaneously, the other end of resistance Ra1 is connected with the anode of AC power vac, the emitter of NPN type BJT pipe Qa3 is connected with one end of resistance Ra5 and one end of resistance Ra6 simultaneously, the base stage of NPN type BJT pipe Qa4 is connected with the other end of resistance Ra5, the collector electrode of NPN type BJT pipe Qa4 is connected with the base stage of NPN type BJT pipe Qa3 and one end of resistance Ra4 simultaneously, the other end of resistance Ra4 is connected with the negative terminal of AC power vac, the emitter of NPN type BJT pipe Qa2 simultaneously with the other end of resistance Ra3, the other end of resistance Ra6, the emitter of NPN type BJT pipe Qa4 and the negative terminal of output voltage Vo are connected.Described auto-excitation type BJT type has input current current-limiting protection function without bridge BuckPFC rectification circuit.

Further again, described controlled current source group M1 comprises NPN type BJT pipe Qb1, NPN type BJT pipe Qb2, NPN type BJT pipe Qb3, NPN type BJT pipe Qb4, resistance Rb1, resistance Rb2, resistance Rb3, resistance Rb4, resistance Rb5, resistance Rb6, resistance Rb7, resistance Rb8 and electric capacity Cb1, one end of resistance Rb3 is the port a of controlled current source group M1, one end of resistance Rb6 is the port b of controlled current source group M1, the other end of resistance Rb3 is connected with the collector electrode of NPN type BJT pipe Qb1, the base stage of NPN type BJT pipe Qb1 is connected with one end of resistance Rb2, the other end of resistance Rb2 is connected with one end of resistance Rb1 and the collector electrode of NPN type BJT pipe Qb2 simultaneously, the other end of resistance Rb1 is connected with the anode of AC power vac, the other end of resistance Rb6 is connected with the collector electrode of NPN type BJT pipe Qb3, the base stage of NPN type BJT pipe Qb3 is connected with one end of resistance Rb5, the other end of resistance Rb5 is connected with one end of resistance Rb4 and the collector electrode of NPN type BJT pipe Qb4 simultaneously, the other end of resistance Rb4 is connected with the negative terminal of AC power vac, the base stage of NPN type BJT pipe Qb2 simultaneously with the base stage of NPN type BJT pipe Qb4, one end of electric capacity Cb1, one end of resistance Rb8 and one end of resistance Rb7 are connected, and the other end of resistance Rb7 is connected with the anode of output voltage Vo, the emitter of NPN type BJT pipe Qb1 simultaneously with the emitter of NPN type BJT pipe Qb3, the emitter of NPN type BJT pipe Qb2, the emitter of NPN type BJT pipe Qb4, the other end of electric capacity Cb1, the other end of resistance Rb8 and the negative terminal of output voltage Vo are connected.Described auto-excitation type BJT type has output voltage stabilizing function without bridge BuckPFC rectification circuit.

Technical conceive of the present utility model is: along with the development of novel semiconductor material device, and the BJT of new material (as SiC) has shown less driving loss, very low resistance coefficient, faster switching speed, less temperature dependency, good short-circuit capacity and there is not the plurality of advantages such as second breakdown.Middle low power without bridge BuckPFC rectification circuit in adopt the BJT of new material, not only can obtain low-power consumption, but also the drive circuit of wholly-controled device can be simplified.

Adopt BJT without the wholly-controled device in bridge BuckPFC rectification circuit, utilize the advantage of BJT service behaviour and use self-excited circuit technology can the simultaneously performance such as realizing circuit simple, high efficiency, easily self-starting.

The beneficial effects of the utility model are mainly manifested in: auto-excitation type BJT type has without bridge BuckPFC rectification circuit ability AC energy being converted in high quality to direct current energy, and output dc voltage value is less than the amplitude of input ac voltage, circuit is simple, drive efficiency is high, self-starting is easy, be suitable for different control methods.

Accompanying drawing explanation

Fig. 1 is the basic electrical block diagram of the utility model.

Fig. 2 is the electrical block diagram after the utility model accelerates dynamic characteristic.

Fig. 3 is the circuit diagram of the utility model embodiment 1.

Fig. 4 is the circuit diagram of the utility model embodiment 2.

Fig. 5 is the simulation work oscillogram of the utility model embodiment 1.

Fig. 6 is the simulation work waveform detail view of the utility model embodiment 1.

Fig. 7 is the simulation work oscillogram of the utility model embodiment 2.

Fig. 8 is the simulation work waveform detail view of the utility model embodiment 2.

Embodiment

Below in conjunction with accompanying drawing, the utility model is further described.

See figures.1.and.2, a kind of auto-excitation type BJT type, without bridge BuckPFC rectification circuit, comprises input capacitance Ci, positive-negative-positive BJT pipe Q1, positive-negative-positive BJT pipe Q2, NPN type BJT pipe Q3, NPN type BJT pipe Q4, positive-negative-positive BJT pipe Q5, positive-negative-positive BJT pipe Q6, diode D1, inductance L 1, output capacitance Co, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6 and for the base current that controlled positive-negative-positive BJT pipe Q1 by port a thus realize to the control of positive-negative-positive BJT pipe Q1 operating state and control the base current of positive-negative-positive BJT pipe Q2 by port b thus one end of the controlled current source group M1 realized the control of positive-negative-positive BJT pipe Q2 operating state, input capacitance Ci simultaneously with the anode of AC power vac, one end of resistance R4, the emitter of positive-negative-positive BJT pipe Q1, the emitter of positive-negative-positive BJT pipe Q5, the emitter of NPN type BJT pipe Q3 and one end of resistance R2 are connected, the collector electrode of positive-negative-positive BJT pipe Q1 simultaneously with one end of resistance R3, one end of resistance R6, the collector electrode of positive-negative-positive BJT pipe Q2, the negative electrode of diode D1 and one end of inductance L 1 are connected, the other end of inductance L 1 simultaneously with one end of output capacitance Co, the anode of output voltage Vo and one end of load Z1 are connected, the other end of output capacitance Co simultaneously with the negative terminal of output voltage Vo, the other end of load Z1, the anode of diode D1, the collector electrode of NPN type BJT pipe Q3 and the collector electrode of NPN type BJT pipe Q4 are connected, the emitter of NPN type BJT pipe Q4 simultaneously with one end of resistance R5, the emitter of positive-negative-positive BJT pipe Q6, the emitter of positive-negative-positive BJT pipe Q2, one end of resistance R1, the other end of input capacitance Ci and the negative terminal of AC power vac are connected, the base stage of NPN type BJT type Q3 is connected with the other end of resistance R1, the base stage of NPN type BJT pipe Q4 is connected with the other end of resistance R4, the base stage of positive-negative-positive BJT pipe Q5 is connected with the other end of resistance R2 and the other end of resistance R3 simultaneously, the base stage of positive-negative-positive BJT pipe Q6 is connected with the other end of resistance R5 and the other end of resistance R6 simultaneously, the base stage of positive-negative-positive BJT pipe Q1 is connected with the collector electrode of positive-negative-positive BJT pipe Q5 and the port a of controlled current source group M1 simultaneously, and the base stage of positive-negative-positive BJT pipe Q2 is connected with the collector electrode of positive-negative-positive BJT pipe Q6 and the port b of controlled current source group M1 simultaneously.

Further, speed-up capacitor C2, resistance R4 two ends in parallel, speed-up capacitor C1, resistance R3 two ends in parallel, resistance R1 two ends speed-up capacitor C3, resistance R6 two ends in parallel speed-up capacitor C4 in parallel.This preferred scheme accelerates the dynamic characteristic of described auto-excitation type BJT type without bridge BuckPFC rectification circuit.

Embodiment 1: with reference to Fig. 1, Fig. 3, Fig. 5 and Fig. 6; the utility model embodiment 1 has input current current-limiting protection function, and it is made up of input capacitance Ci, positive-negative-positive BJT pipe Q1, positive-negative-positive BJT pipe Q2, NPN type BJT pipe Q3, NPN type BJT pipe Q4, positive-negative-positive BJT pipe Q5, positive-negative-positive BJT pipe Q6, diode D1, inductance L 1, output capacitance Co, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, controlled current source group M1.Wherein, controlled current source M1 is made up of NPN type BJT pipe Qa1, NPN type BJT pipe Qa2, NPN type BJT pipe Qa3, NPN type BJT pipe Qa4, resistance Ra1, resistance Ra2, resistance Ra3, resistance Ra4, resistance Ra5, resistance Ra6 again.

As shown in Figure 3, one end of input capacitance Ci simultaneously with the anode of AC power vac, one end of resistance R4, the emitter of positive-negative-positive BJT pipe Q1, the emitter of positive-negative-positive BJT pipe Q5, the emitter of NPN type BJT pipe Q3 and one end of resistance R2 are connected, the collector electrode of positive-negative-positive BJT pipe Q1 simultaneously with one end of resistance R3, one end of resistance R6, the collector electrode of positive-negative-positive BJT pipe Q2, the negative electrode of diode D1 and one end of inductance L 1 are connected, the other end of inductance L 1 simultaneously with one end of output capacitance Co, the anode of output voltage Vo and one end of load Z1 are connected, the other end of output capacitance Co simultaneously with the negative terminal of output voltage Vo, the other end of load Z1, the anode of diode D1, the collector electrode of NPN type BJT pipe Q3 and the collector electrode of NPN type BJT pipe Q4 are connected, the emitter of NPN type BJT pipe Q4 simultaneously with one end of resistance R5, the emitter of positive-negative-positive BJT pipe Q6, the emitter of positive-negative-positive BJT pipe Q2, one end of resistance R1, the other end of input capacitance Ci and the negative terminal of AC power vac are connected, the base stage of NPN type BJT type Q3 is connected with the other end of resistance R1, the base stage of NPN type BJT pipe Q4 is connected with the other end of resistance R4, the base stage of positive-negative-positive BJT pipe Q5 is connected with the other end of resistance R2 and the other end of resistance R3 simultaneously, the base stage of positive-negative-positive BJT pipe Q6 is connected with the other end of resistance R5 and the other end of resistance R6 simultaneously, the base stage of positive-negative-positive BJT pipe Q1 is connected with the collector electrode of positive-negative-positive BJT pipe Q5 and the port a of controlled current source group M1 simultaneously, the base stage of positive-negative-positive BJT pipe Q2 is connected with the collector electrode of positive-negative-positive BJT pipe Q6 and the port b of controlled current source group M1 simultaneously, the port a of the current collection of NPN type BJT pipe Qa1 very controlled current source group M1, the port b of the current collection of NPN type BJT pipe Qa3 very controlled current source group M1, the emitter of NPN type BJT pipe Qa1 is connected with one end of resistance Ra2 and one end of resistance Ra3 simultaneously, the base stage of NPN type BJT pipe Qa2 is connected with the other end of resistance Ra2, the collector electrode of NPN type BJT pipe Qa2 is connected with the base stage of NPN type BJT pipe Qa1 and one end of resistance Ra1 simultaneously, the other end of resistance Ra1 is connected with the anode of AC power vac, the emitter of NPN type BJT pipe Qa3 is connected with one end of resistance Ra5 and one end of resistance Ra6 simultaneously, the base stage of NPN type BJT pipe Qa4 is connected with the other end of resistance Ra5, the collector electrode of NPN type BJT pipe Qa4 is connected with the base stage of NPN type BJT pipe Qa3 and one end of resistance Ra4 simultaneously, the other end of resistance Ra4 is connected with the negative terminal of AC power vac, the emitter of NPN type BJT pipe Qa2 simultaneously with the other end of resistance Ra3, the other end of resistance Ra6, the emitter of NPN type BJT pipe Qa4 and the negative terminal of output voltage Vo are connected.

Fig. 5 is the simulation work oscillogram of the utility model embodiment 1, and Fig. 6 is the simulation work waveform detail view of the utility model embodiment 1, and its steady operation principle is as follows:

As vac>0, AC power vac is in positive half cycle (i.e. ta1<t<ta2); As vac<0, AC power vac is in negative half period (i.e. ta2<t<ta3).Q4 is in the positive half cycle conducting of AC power vac, negative half period cut-off, and Q3 is in the positive half cycle cut-off of AC power vac, negative half period conducting.

(1) in the positive half cycle of AC power vac, Q2 ends, and Q1 self-excitation works

When Q1 conducting (ta11<t<ta12), vac, Q1, L1, Co, Z1, Q4 form loop, and L1 magnetizes, and the collector current iQc1 of input current iac, inductive current iL1, Q1 all increases.Along with the increase of iQc1, under the effect of Q5 and controlled current source group M1 port a the operating state of Q1 gradually from saturation region to amplification region, cut-off region transfer.When Q1 just enters cut-off state from conducting state,

$iac\&ap;max(\frac{vac-VBE\_Qa1}{Ra1+\mathrm{\&beta;}\_Qa1\&CenterDot;Ra3}\&CenterDot;\mathrm{\&beta;}\_Qa1\&CenterDot;\mathrm{\&beta;}\_Q1,\frac{VBE\_Qa2}{Ra3}\&CenterDot;\mathrm{\&beta;}\_Q1),$

Wherein max () is for getting max function, VBE_Qa1 is the base-emitter conduction voltage drop of Qa1, VBE_Qa2 is the base-emitter conduction voltage drop of Qa2, and β _ Qa1 is the common emitter current gain of Qa1, and β _ Q1 is the common emitter current gain of Q1.When Q1 ends (ta12<t<ta13), L1, Co, Z1, D1 form loop, and L1 puts magnetic, and inductive current iL1 and diode current iD1 all reduces.When iD1 is decreased to zero, D1 cut-off, Q1 is conducting again, goes round and begins again.

(2) in AC power vac negative half period, Q1 ends, and Q2 self-excitation works

In like manner, when Q2 conducting, vac, Q2, L1, Co, Z1, Q3 form loop, and L1 magnetizes, and input current iac oppositely increases, the collector current iQc2 then forward increase of inductive current iL1 and Q2.Along with the increase of iQc2, under the effect of Q6 and controlled current source group M1 port b the operating state of Q2 gradually from saturation region to amplification region, cut-off region transfer.When Q2 just enters cut-off state from conducting state,

$\left|iac\right|\&ap;max(\frac{\left|vac\right|-VBE\_Qa3}{Ra4+\mathrm{\&beta;}\_Qa3\&CenterDot;Ra6}\&CenterDot;\mathrm{\&beta;}\_Qa3\&CenterDot;\mathrm{\&beta;}\_Q2,\frac{VBE\_Qa4}{Ra6}\&CenterDot;\mathrm{\&beta;}\_Q2),$

Wherein max () is for getting max function, VBE_Qa3 is the base-emitter conduction voltage drop of Qa3, VBE_Qa4 is the base-emitter conduction voltage drop of Qa4, and β _ Qa3 is the common emitter current gain of Qa3, and β _ Q2 is the common emitter current gain of Q2.When Q2 ends, L1, Co, Z1, D1 form loop, and L1 puts magnetic, and inductive current iL1 and diode current iD1 all reduces.When iD1 is decreased to zero, D1 cut-off, Q2 is conducting again, goes round and begins again.

From the above, the peak value of the input current iac of the utility model embodiment 1 is subject to the restriction of controlled current source group M1.

Embodiment 2: with reference to Fig. 1, Fig. 4, Fig. 7 and Fig. 8, the utility model embodiment 2 has output voltage stabilizing function, and it is made up of input capacitance Ci, positive-negative-positive BJT pipe Q1, positive-negative-positive BJT pipe Q2, NPN type BJT pipe Q3, NPN type BJT pipe Q4, positive-negative-positive BJT pipe Q5, positive-negative-positive BJT pipe Q6, diode D1, inductance L 1, output capacitance Co, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6, controlled current source group M1.Wherein, controlled current source group M1 is made up of NPN type BJT pipe Qb1, NPN type BJT pipe Qb2, NPN type BJT pipe Qb3, NPN type BJT pipe Qb4, resistance Rb1, resistance Rb2, resistance Rb3, resistance Rb4, resistance Rb5, resistance Rb6, resistance Rb7, resistance Rb8, electric capacity Cb1 again.

As shown in Figure 4, one end of input capacitance Ci simultaneously with the anode of AC power vac, one end of resistance R4, the emitter of positive-negative-positive BJT pipe Q1, the emitter of positive-negative-positive BJT pipe Q5, the emitter of NPN type BJT pipe Q3 and one end of resistance R2 are connected, the collector electrode of positive-negative-positive BJT pipe Q1 simultaneously with one end of resistance R3, one end of resistance R6, the collector electrode of positive-negative-positive BJT pipe Q2, the negative electrode of diode D1 and one end of inductance L 1 are connected, the other end of inductance L 1 simultaneously with one end of output capacitance Co, the anode of output voltage Vo and one end of load Z1 are connected, the other end of output capacitance Co simultaneously with the negative terminal of output voltage Vo, the other end of load Z1, the anode of diode D1, the collector electrode of NPN type BJT pipe Q3 and the collector electrode of NPN type BJT pipe Q4 are connected, the emitter of NPN type BJT pipe Q4 simultaneously with one end of resistance R5, the emitter of positive-negative-positive BJT pipe Q6, the emitter of positive-negative-positive BJT pipe Q2, one end of resistance R1, the other end of input capacitance Ci and the negative terminal of AC power vac are connected, the base stage of NPN type BJT type Q3 is connected with the other end of resistance R1 simultaneously, the base stage of NPN type BJT pipe Q4 is connected with the other end of resistance R4, the base stage of positive-negative-positive BJT pipe Q5 is connected with the other end of resistance R2 and the other end of resistance R3 simultaneously, the base stage of positive-negative-positive BJT pipe Q6 is connected with the other end of resistance R5 and the other end of resistance R6 simultaneously, the base stage of positive-negative-positive BJT pipe Q1 is connected with the collector electrode of positive-negative-positive BJT pipe Q5 and the port a of controlled current source group M1 simultaneously, the base stage of positive-negative-positive BJT pipe Q2 is connected with the collector electrode of positive-negative-positive BJT pipe Q6 and the port b of controlled current source group M1 simultaneously, one end of resistance Rb3 is the port a of controlled current source group M1, one end of resistance Rb6 is the port b of controlled current source group M1, the other end of resistance Rb3 is connected with the collector electrode of NPN type BJT pipe Qb1, the base stage of NPN type BJT pipe Qb1 is connected with one end of resistance Rb2, the other end of resistance Rb2 is connected with one end of resistance Rb1 and the collector electrode of NPN type BJT pipe Qb2 simultaneously, the other end of resistance Rb1 is connected with the anode of AC power vac, the other end of resistance Rb6 is connected with the collector electrode of NPN type BJT pipe Qb3, the base stage of NPN type BJT pipe Qb3 is connected with one end of resistance Rb5, the other end of resistance Rb5 is connected with one end of resistance Rb4 and the collector electrode of NPN type BJT pipe Qb4 simultaneously, the other end of resistance Rb4 is connected with the negative terminal of AC power vac, the base stage of NPN type BJT pipe Qb2 simultaneously with the base stage of NPN type BJT pipe Qb4, one end of electric capacity Cb1, one end of resistance Rb8 and one end of resistance Rb7 are connected, the other end of resistance Rb7 is connected with the anode of output voltage Vo, the emitter of NPN type BJT pipe Qb1 simultaneously with the emitter of NPN type BJT pipe Qb3, the emitter of NPN type BJT pipe Qb2, the emitter of NPN type BJT pipe Qb4, the other end of electric capacity Cb1, the other end of resistance Rb8 and the negative terminal of output voltage Vo are connected.

Fig. 7 is the simulation work oscillogram of the utility model embodiment 2, and Fig. 8 is the simulation work waveform detail view of the utility model embodiment 2, and its steady operation principle is as follows:

As vac>0, AC power vac is in positive half cycle (i.e. tb1<t<tb2); As vac<0, AC power vac is in negative half period (i.e. tb2<t<tb3).Q4 is in the positive half cycle conducting of AC power vac, negative half period cut-off, and Q3 is in the positive half cycle cut-off of AC power vac, negative half period conducting.

(1) in AC power vac negative half period, Q1 ends, and Q2 self-excitation works

When Q2 conducting (tb21<t<tb22), vac, Q2, L1, Co, Z1, Q3 form loop, L1 magnetizes, and input current iac oppositely increases, the collector current iQc2 then forward increase of inductive current iL1 and Q2.Along with the increase of iQc2, under the effect of Q6 and controlled current source group M1 port b the operating state of Q2 gradually from saturation region to amplification region, cut-off region transfer.When Q2 ends (tb22<t<tb23), L1, Co, Z1, D1 form loop, and L1 puts magnetic, and inductive current iL1 and diode current iD1 all reduces.When iD1 is decreased to zero, D1 cut-off, Q2 is conducting again, goes round and begins again.

VBE_Qb is the base-emitter conduction voltage drop of Qb4 and Qb2.When time, controlled current source group M1 reduces the base current of Q2 by port b, shortens the ON time of Q2, even extends the turn-off time of Q2, Vo is fallen after rise.When time, controlled current source group M1 maximizes the base current of Q2 by port b, maximizes the ON time of Q2, Vo is gone up.

(2) in the positive half cycle of AC power vac, Q2 ends, and Q1 self-excitation works

In like manner, when Q1 conducting, vac, Q1, L1, Co, Z1, Q4 form loop, and L1 magnetizes, and the collector current iQc1 of input current iac, inductive current iL1, Q1 increases.Along with the increase of iQc1, under the effect of Q5 and controlled current source group M1 port a the operating state of Q1 gradually from saturation region to amplification region, cut-off region transfer.When Q1 ends, L1, Co, Z1, D1 form loop, and L1 puts magnetic, and inductive current iL1 and diode current iD1 all reduces.When iD1 is decreased to zero, D1 cut-off, Q1 is conducting again, goes round and begins again.

VBE_Qb is the base-emitter conduction voltage drop of Qb2 and Qb4.When time, controlled current source group M1 reduces the base current of Q1 by port a, shortens the ON time of Q1, even extends the turn-off time of Q1, Vo is fallen after rise.When time, controlled current source group M1 maximizes the base current of Q1 by port a, maximizes the ON time of Q1, Vo is gone up.

From the above, the output voltage Vo of the utility model embodiment 2 can realize stablizing under the adjustment of controlled current source group M1.

Content described in this specification embodiment is only enumerating the way of realization that utility model is conceived; should not being regarded as of protection range of the present utility model is only limitted to the concrete form that embodiment is stated, protection range of the present utility model also and conceive the equivalent technologies means that can expect according to the utility model in those skilled in the art.

Claims (4)

1. auto-excitation type BJT type is without a bridge BuckPFC rectification circuit, it is characterized in that: comprise input capacitance Ci, positive-negative-positive BJT pipe Q1, positive-negative-positive BJT pipe Q2, NPN type BJT pipe Q3, NPN type BJT pipe Q4, positive-negative-positive BJT pipe Q5, positive-negative-positive BJT pipe Q6, diode D1, inductance L 1, output capacitance Co, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5, resistance R6 and for the base current that controlled positive-negative-positive BJT pipe Q1 by port a thus realize to the control of positive-negative-positive BJT pipe Q1 operating state and control the base current of positive-negative-positive BJT pipe Q2 by port b thus one end of the controlled current source group M1 realized the control of positive-negative-positive BJT pipe Q2 operating state, input capacitance Ci simultaneously with the anode of AC power vac, one end of resistance R4, the emitter of positive-negative-positive BJT pipe Q1, the emitter of positive-negative-positive BJT pipe Q5, the emitter of NPN type BJT pipe Q3 and one end of resistance R2 are connected, the collector electrode of positive-negative-positive BJT pipe Q1 simultaneously with one end of resistance R3, one end of resistance R6, the collector electrode of positive-negative-positive BJT pipe Q2, the negative electrode of diode D1 and one end of inductance L 1 are connected, the other end of inductance L 1 simultaneously with one end of output capacitance Co, the anode of output voltage Vo and one end of load Z1 are connected, the other end of output capacitance Co simultaneously with the negative terminal of output voltage Vo, the other end of load Z1, the anode of diode D1, the collector electrode of NPN type BJT pipe Q3 and the collector electrode of NPN type BJT pipe Q4 are connected, the emitter of NPN type BJT pipe Q4 simultaneously with one end of resistance R5, the emitter of positive-negative-positive BJT pipe Q6, the emitter of positive-negative-positive BJT pipe Q2, one end of resistance R1, the other end of input capacitance Ci and the negative terminal of AC power vac are connected, the base stage of NPN type BJT type Q3 is connected with the other end of resistance R1, the base stage of NPN type BJT pipe Q4 is connected with the other end of resistance R4, the base stage of positive-negative-positive BJT pipe Q5 is connected with the other end of resistance R2 and the other end of resistance R3 simultaneously, the base stage of positive-negative-positive BJT pipe Q6 is connected with the other end of resistance R5 and the other end of resistance R6 simultaneously, the base stage of positive-negative-positive BJT pipe Q1 is connected with the collector electrode of positive-negative-positive BJT pipe Q5 and the port a of controlled current source group M1 simultaneously, and the base stage of positive-negative-positive BJT pipe Q2 is connected with the collector electrode of positive-negative-positive BJT pipe Q6 and the port b of controlled current source group M1 simultaneously.

2. auto-excitation type BJT type as claimed in claim 1 is without bridge BuckPFC rectification circuit, it is characterized in that: resistance R1 two ends speed-up capacitor C1 in parallel, speed-up capacitor C2, resistance R4 two ends in parallel, resistance R3 two ends speed-up capacitor C3, resistance R6 two ends in parallel speed-up capacitor C4 in parallel.

3. auto-excitation type BJT type as claimed in claim 1 or 2 is without bridge BuckPFC rectification circuit, it is characterized in that: described controlled current source group M1 comprises NPN type BJT pipe Qa1, NPN type BJT pipe Qa2, NPN type BJT pipe Qa3, NPN type BJT pipe Qa4, resistance Ra1, resistance Ra2, resistance Ra3, resistance Ra4, resistance Ra5 and resistance Ra6, the port a of the current collection of NPN type BJT pipe Qa1 very controlled current source group M1, the port b of the current collection of NPN type BJT pipe Qa3 very controlled current source group M1, the emitter of NPN type BJT pipe Qa1 is connected with one end of resistance Ra2 and one end of resistance Ra3 simultaneously, the base stage of NPN type BJT pipe Qa2 is connected with the other end of resistance Ra2, the collector electrode of NPN type BJT pipe Qa2 is connected with the base stage of NPN type BJT pipe Qa1 and one end of resistance Ra1 simultaneously, the other end of resistance Ra1 is connected with the anode of AC power vac, the emitter of NPN type BJT pipe Qa3 is connected with one end of resistance Ra5 and one end of resistance Ra6 simultaneously, the base stage of NPN type BJT pipe Qa4 is connected with the other end of resistance Ra5, the collector electrode of NPN type BJT pipe Qa4 is connected with the base stage of NPN type BJT pipe Qa3 and one end of resistance Ra4 simultaneously, the other end of resistance Ra4 is connected with the negative terminal of AC power vac, the emitter of NPN type BJT pipe Qa2 simultaneously with the other end of resistance Ra3, the other end of resistance Ra6, the emitter of NPN type BJT pipe Qa4 and the negative terminal of output voltage Vo are connected.

4. auto-excitation type BJT type as claimed in claim 1 or 2 is without bridge BuckPFC rectification circuit, it is characterized in that: described controlled current source group M1 comprises NPN type BJT pipe Qb1, NPN type BJT pipe Qb2, NPN type BJT pipe Qb3, NPN type BJT pipe Qb4, resistance Rb1, resistance Rb2, resistance Rb3, resistance Rb4, resistance Rb5, resistance Rb6, resistance Rb7, resistance Rb8 and electric capacity Cb1, one end of resistance Rb3 is the port a of controlled current source group M1, one end of resistance Rb6 is the port b of controlled current source group M1, the other end of resistance Rb3 is connected with the collector electrode of NPN type BJT pipe Qb1, the base stage of NPN type BJT pipe Qb1 is connected with one end of resistance Rb2, the other end of resistance Rb2 is connected with one end of resistance Rb1 and the collector electrode of NPN type BJT pipe Qb2 simultaneously, the other end of resistance Rb1 is connected with the anode of AC power vac, the other end of resistance Rb6 is connected with the collector electrode of NPN type BJT pipe Qb3, the base stage of NPN type BJT pipe Qb3 is connected with one end of resistance Rb5, the other end of resistance Rb5 is connected with one end of resistance Rb4 and the collector electrode of NPN type BJT pipe Qb4 simultaneously, the other end of resistance Rb4 is connected with the negative terminal of AC power vac, the base stage of NPN type BJT pipe Qb2 simultaneously with the base stage of NPN type BJT pipe Qb4, one end of electric capacity Cb1, one end of resistance Rb8 and one end of resistance Rb7 are connected, and the other end of resistance Rb7 is connected with the anode of output voltage Vo, the emitter of NPN type BJT pipe Qb1 simultaneously with the emitter of NPN type BJT pipe Qb3, the emitter of NPN type BJT pipe Qb2, the emitter of NPN type BJT pipe Qb4, the other end of electric capacity Cb1, the other end of resistance Rb8 and the negative terminal of output voltage Vo are connected.