CN103326597B

CN103326597B - Power factor modifier controller and non-bridge type power factor correction circuit thereof

Info

Publication number: CN103326597B
Application number: CN201210077813.1A
Authority: CN
Inventors: 徐达经
Original assignee: NIKESEN MICRO ELECTRONIC CO Ltd
Current assignee: NIKESEN MICRO ELECTRONIC CO Ltd
Priority date: 2012-03-22
Filing date: 2012-03-22
Publication date: 2015-10-28
Anticipated expiration: 2032-03-22
Also published as: CN103326597A

Abstract

The invention provides a kind of power factor modifier controller and non-bridge type power factor correction circuit thereof, in order to control the conducting state of at least one switch element; This power factor modifier controller has a feedback control circuit, an On current circuit for detecting and a switch element control circuit; Feedback control circuit, according to a feedback voltage signal, produces a feedback control signal in order to control this switching elements interrupt; On current circuit for detecting, has a reed position circuit; This reed position circuit, at least according to the negative potential part of an On current detection signal, produces a potential change signal changed within the scope of positive potential; On current circuit for detecting, at least according to described potential change signal, produces a pick-off signal with control switch elements interrupt; Switch element control circuit foundation feedback control signal and pick-off signal, control switch elements interrupt.Power factor modifier controller of the present invention can solve the uppity problem of power factor correction circuit.

Description

Power factor modifier controller and non-bridge type power factor correction circuit thereof

Technical field

The present invention relates to a kind of power factor modifier controller and application circuit thereof, particularly relate to a kind of power factor modifier controller being applicable to non-bridge type power factor correction circuit.

Background technology

Under environmental protection and energy saving are day by day extremely paid attention to, exchange the improvement of isolated form switched power supplier on power, have the trend development towards secondary side synchronous rectification control and the application of primary side power factor correction (PFC) topology.

Figure 1A and Figure 1B is the schematic diagram of an existing full-bridge type power factor application circuit.As shown in Figure 1A and Figure 1B, this application circuit can divide into bridge rectifier and DC converting circuit two parts.After alternating current that AC power AC provides first is converted to direct current via bridge rectifier, then is converted to output voltage Vo via DC converting circuit and is supplied to load (Load) Ro.

As shown in Figure 1A and Figure 1B, when the alternating voltage that AC power AC provides is in positive half cycle, the electric current that AC power AC produces, via the switch element sw0 of diode d1, inductance L i, conducting and diode d4, is back to AC power AC.When switch element sw0 turns off, releasing of inductance L i can electric current be then by inductance L i, via diode Do, load Ro, diode d4, AC power AC and diode d1, is back to inductance L i.When the alternating voltage that AC power AC provides is in negative half period, the electric current that AC power AC produces, via the switch element sw0 of diode d2, inductance L i, conducting and diode d3, is back to AC power AC.When switch element sw0 turns off, releasing of inductance L i can electric current be then by inductance L i, via diode Do, load Ro, diode d3, AC power AC and diode d2, is back to inductance L i.

At present, the application surface of power factor correction topology has towards the future development of no bridge type design.Non-bridge type power factor correction circuit topology, as the term suggests exactly existing bridge rectifier and power factor correction are separated the circuit topography that the circuit topography controlled changes into shared structure, is lost so as to saving bridge rectifier forward voltage drop to promote power supply unit efficiency.

Fig. 2 A and Fig. 2 B is the schematic diagram of a typical non-bridge type power factor correction application circuit.Four of bridge rectifier diodes and power factor correction circuit are integrated by this application circuit, utilize two diode d5, d6 and two switch element sw1, sw2, replace the function of bridge rectifier originally.Simultaneously by controlling these two switch element sw1, the conducting of sw2 and shutoff, reach the object of power factor correction.As shown in Fig. 2 A and Fig. 2 B, when the alternating voltage that AC power AC provides is in positive half cycle, the electric current that AC power AC produces, via switch element sw1 and the sw2 of inductance L i, conducting, is back to AC power AC, to charge to inductance L i.When switch element sw1 and sw2 turns off, what inductance L i produced releases can electric current be then by inductance L i, via body diode (body diode) ds2 of diode d5, load Ro and switch element sw2, is back to inductance L i.

When the alternating voltage that AC power AC provides is in negative half period, the electric current that AC power AC produces, via switch element sw2 and the sw1 of conducting, flows through inductance L i, then is back to AC power AC, to charge to inductance L i.When switch element sw1 and sw2 turns off, what inductance L i produced releases can electric current be then by inductance L i, through the body diode ds1 of AC power AC, diode d6, load Ro and switch element sw1, is back to inductance L i.

For bridge type power factor correction application circuit, the current path of its bridge rectifier need through two diodes, and these diodes can produce conduction losses and affect overall transformation efficiency.By contrast, non-bridge type power factor correction application circuit can reduce the number of diodes that electric current flows through, and effectively reduces switching process because the pressure drop that causes of diode and consume.

Fig. 3 A and Fig. 3 B is the schematic diagram of another typical non-bridge type power factor correction application circuit.This application circuit adopts the type of drive of totem (Totem pole), thus needs extra high-pressure side driving circuit (high side driver).Therefore, the complexity come than Fig. 2 A and Fig. 2 B application circuit of the drived control of this kind of application circuit.

As shown in Fig. 3 A and Fig. 3 B, when the alternating voltage that AC power AC provides is in positive half cycle and switch element sw3 turns off, the electric current that AC power AC produces, via the switch element sw4 of inductance L i, conducting and diode d8, is back to AC power AC, to charge to inductance L i.When switch element sw4 shutoff during switch element sw3 conducting, what inductance L i produced releases can electric current be then by inductance L i, via switch element sw3, load Ro and the diode d8 of conducting, is back to inductance L i.

When the alternating voltage that AC power AC provides is in negative half period and switch element sw4 turns off, the electric current that AC power AC produces, via the switch element sw3 of diode d7 and conducting, flows through inductance L i, then is back to AC power AC, to charge to inductance L i.When switch element sw3 turns off, what inductance L i produced release can electric current be then by inductance L i, through the switch element sw4 of AC power AC, diode d7, load Ro and conducting, is back to inductance L i.

The inductance L i of above-mentioned two non-bridge type power factor correction application circuits, when AC power AC is in positive half cycle or negative half period exports, can carry out the running of energy storage and energy release.In other words, no matter AC power AC is in positive half cycle or negative half period when exporting, all must for switch element sw1, and sw2, sw3, sw4 make suitable control.The current status that thus can face induction coil current and switch element is detected not easily, and cannot make for switch element sw1, sw2, sw3, sw4 the problem suitably controlled.

Summary of the invention

Main purpose of the present invention is to provide a kind of power factor Correction and Control circuit, and the positive half cycle of AC power and negative half period can be coordinated to export, the positive direction on the inductance of effective detecting change-over circuit and the electric current of negative direction.

Another object of the present invention is to provide a kind of power factor Correction and Control circuit, the positive half cycle of AC power and negative half period can be coordinated to export, the On current of effective detection switch element.

One embodiment of the invention provide a kind of power factor correction (PFC) controller, in order to control the conducting state of at least one switch element.This power factor modifier controller has a feedback control circuit, an On current circuit for detecting and a switch element control circuit.Feedback control circuit, according to a feedback voltage signal, produces a feedback control signal in order to control this switching elements interrupt.On current circuit for detecting, has a reed position circuit.This reed position circuit, at least according to the negative potential part of an On current detection signal, produces a potential change signal changed within the scope of positive potential.On current circuit for detecting, at least according to front taking off potential change signal, produces a pick-off signal with control switch elements interrupt.Switch element control circuit foundation feedback control signal and pick-off signal, control switch elements interrupt.

In other words, the invention provides a kind of power factor modifier controller, in order to control the conducting state of at least one switch element, this power factor modifier controller comprises: a feedback control circuit, according to a feedback voltage signal, produce a feedback control signal in order to control this switching elements interrupt; One On current circuit for detecting, there is one second reed position circuit, this the second reed position circuit is at least according to the negative potential part of an On current detection signal, produce a second potential change signal changed within the scope of positive potential, this On current circuit for detecting, at least according to this second potential change signal, produces a pick-off signal to control this switching elements interrupt; And a switch element control circuit, according to this feedback control signal and this pick-off signal, control this switching elements interrupt.

Another embodiment of the present invention provides a kind of non-bridge type power factor correction circuit.This non-bridge type power factor correction circuit comprises a change-over circuit, a switching current circuit for detecting and a power factor modifier controller.Change-over circuit has a high-pressure side circuit and a low-pressure side circuit, and comprises one first high-pressure side rectifier cell and one first low-pressure side rectifier cell, one second high-pressure side rectifier cell and one second low-pressure side rectifier cell, at least one inductance and an output capacitance.Wherein, the first high-pressure side rectifier cell and the first low-pressure side rectifier cell are serially connected with between high-pressure side circuit and low-pressure side circuit, and, define one first contact between the first high-pressure side rectifier cell and the first low-pressure side rectifier cell.Second high-pressure side rectifier cell and the second low-pressure side rectifier cell are serially connected with between high-pressure side circuit and low-pressure side circuit, and, define one second contact between the second high-pressure side rectifier cell and the second low-pressure side rectifier cell.Inductance is connected between an AC power and the first contact, and this AC power and inductance are serially connected with between the first contact and the second contact.Output capacitance is connected between high-pressure side circuit and low-pressure side circuit.First high-pressure side rectifier cell, the first low-pressure side rectifier cell, the second high-pressure side rectifier cell and the second low-pressure side rectifier cell at least one of them is a switch element.

Switching current circuit for detecting is connected to switch element, and detecting flows through an On current of switch element, to produce an On current detection signal.Power factor modifier controller has a feedback control circuit, an On current circuit for detecting and a switch element control circuit.Feedback control circuit, according to a feedback voltage signal, produces a feedback control signal in order to control this switching elements interrupt.On current circuit for detecting has a reed position circuit.This reed position circuit, at least according to the negative potential part of On current detection signal, produces a potential change signal changed within the scope of positive potential.On current circuit for detecting, at least according to above-mentioned potential change signal, produces a pick-off signal with control switch elements interrupt.Switch element control circuit foundation feedback control signal and pick-off signal, control switch elements interrupt.

In other words, the present invention also provides a kind of non-bridge type power factor correction circuit, this non-bridge type power factor correction circuit comprises: a change-over circuit, there is a high-pressure side circuit and a low-pressure side circuit, this change-over circuit also comprises: one first high-pressure side rectifier cell and one first low-pressure side rectifier cell, be serially connected with between this high-pressure side circuit and this low-pressure side circuit, and, define one first contact between this first high-pressure side rectifier cell and this first low-pressure side rectifier cell; One second high-pressure side rectifier cell and one second low-pressure side rectifier cell, be serially connected with between this high-pressure side circuit and this low-pressure side circuit, and, define one second contact between this second high-pressure side rectifier cell and this second low-pressure side rectifier cell; At least one inductance, is connected between an AC power and this first contact, and this AC power and this inductance are serially connected with between this first contact and this second contact; And an output capacitance, be connected between this high-pressure side circuit and this low-pressure side circuit; Wherein, this first high-pressure side rectifier cell, this first low-pressure side rectifier cell, this second high-pressure side rectifier cell and this second low-pressure side rectifier cell at least one of them is a switch element; This non-bridge type power factor correction circuit also comprises a switching current circuit for detecting, is connected to this switch element, and detecting flows through an On current of this switch element, to produce an On current detection signal; And a power factor modifier controller, this power factor modifier controller comprises: a feedback control circuit, according to the feedback voltage signal of output voltage corresponding to this change-over circuit, produces a feedback control signal in order to control this switching elements interrupt; One On current circuit for detecting, there is one second reed position circuit, this the second reed position circuit is at least according to the negative potential part of this On current detection signal, produce a second potential change signal changed within the scope of positive potential, this On current circuit for detecting, at least according to this second potential change signal, produces a pick-off signal to control this switching elements interrupt; And a switch element control circuit, according to this feedback control signal and this pick-off signal, control this switching elements interrupt.

Power factor modifier controller of the present invention effectively can detect the induction coil current of non-bridge type power factor correction circuit and the On current of switch element, thus can solve the uppity problem of power factor correction circuit.

Can be further understood by following detailed Description Of The Invention and appended accompanying drawing about the advantages and spirit of the present invention.

Accompanying drawing explanation

Figure 1A and Figure 1B is the schematic diagram of an existing full-bridge type power factor application circuit;

Fig. 2 A and Fig. 2 B is the schematic diagram of a typical non-bridge type power factor correction application circuit;

Fig. 3 A and Fig. 3 B is the schematic diagram of another typical non-bridge type power factor correction application circuit;

Fig. 4 is the schematic diagram of a kind of power factor correction of the present invention application circuit one embodiment;

Fig. 5 is the schematic diagram of another embodiment of a kind of power factor correction of the present invention application circuit;

Fig. 6 is the schematic diagram of the another embodiment of a kind of power factor of the present invention correction application circuit;

Fig. 7 is the schematic diagram of a kind of power factor modifier controller one of the present invention embodiment;

Fig. 8 is the movement oscillogram of the power factor correction application circuit of Fig. 6;

Fig. 9 A and Fig. 9 B is the movement oscillogram of the zero current circuit for detecting of Fig. 7;

Figure 10 A and Figure 10 B figure is the movement oscillogram of the On current circuit for detecting of Fig. 7.

[main element description of reference numerals]

AC power AC

Output voltage Vo

Diode d1, d2, d3, d4, d5, d6, d7, d8

Inductance L i

Switch element sw0, sw1, sw2, sw3, sw4

Diode Do

Load Ro, R1

Body diode (body diode) ds1, ds2

Bridge rectifier B0

Inductance L 1

Switch Q1

Diode D1

Electric capacity C1

Auxiliary induction L2

Resistance Rb, R2, R3

Power factor modifier controller 160,260,400

Switching current circuit for detecting 170,270,370

On current detection signal VCS

Inductive current detection signal VZCD

Feedback voltage signal VFB

High-pressure side circuit HL

Low-pressure side circuit LL

First high-pressure side rectifier cell DH1

First low-pressure side rectifier cell QL1

Second high-pressure side rectifier cell DH2

Second low-pressure side rectifier cell QL2

First contact N1

Second contact N2

First detecting diode DT1

Second detecting diode DT2

3rd contact N3

Input current Iin

Zero current circuit for detecting 420

On current circuit for detecting 440

Feedback control circuit 450

Switch element control circuit 260

First reed position circuit 422

First logical circuit 424

First comparator COM1

Second comparator COM2

First potential change signal VZCD '

Feedback control signal SFB

Zero current signal SZC

First reference potential Vr1, Vr1 '

First comparison signal VCOM1

Second reference potential Vr2, Vr2 '

Second comparison signal VCOM2

First one shots OS1

Second one shots OS2

Or door OR1, OR2

First pulse signal PUL1

Second pulse signal PUL2

Second reed position circuit 442

Second logical circuit 444

3rd comparator COM3

4th comparator COM4

Second potential change signal VCS '

3rd reference potential Vr3

3rd comparison signal VCOM3

4th reference potential Vr4

4th comparison signal VCOM4

Pick-off signal SCS

Default voltage Va

Drive singal DRV

Grid potential VG

Switch element control circuit 460

Alternating voltage VAC

Embodiment

Fig. 4 is the schematic diagram of application circuit one preferred embodiment of a kind of power factor modifier controller of the present invention.As shown in Figure 4, this application circuit can divide into bridge rectifier B0 and DC converting circuit two parts.After AC energy that AC power AC provides first is converted to direct current via bridge rectifier B0, then is converted to output voltage Vo via DC converting circuit and is supplied to load R1.

DC converting circuit has inductance L 1, switch Q1, diode D1, an electric capacity C1, switching current circuit for detecting 170, auxiliary induction L2, a bleeder circuit (being made up of resistance R2 and R3) and a power factor modifier controller 160.Switching current circuit for detecting 170 has a resistance, is connected in series to switch Q1, the On current flowing through switch Q1 to be converted to an On current detection signal VCS.Auxiliary induction L2 in order to detect the inductive current in inductance L 1, to produce an inductive current detection signal VZCD.A resistance Rb is connected with between auxiliary induction L2 and power factor modifier controller 160.This resistance Rb can prevent inductive current detection signal VZCD from directly pouring into power factor modifier controller 160 and causing circuit abnormality.The output voltage Vo of DC converting circuit is converted to a feedback voltage signal VFB by bleeder circuit, exports power factor modifier controller 160 to.In sum, the power factor modifier controller 160 of the present embodiment is except the On current by switching current circuit for detecting 170 detection switch Q1, and by outside bleeder circuit detecting output voltage Vo, also detect the inductive current in inductance L 1 by auxiliary induction L2.

Fig. 5 is the schematic diagram of another embodiment of application circuit of a kind of power factor modifier controller of the present invention.Be described for a non-bridge type power factor correction circuit in Fig. 5.As shown in Figure 5, this non-bridge type power factor correction circuit comprises a change-over circuit, switching current circuit for detecting 270 and a power factor modifier controller 260.Difference place below for the application circuit of the present embodiment and the application circuit of Fig. 4 is described, resemblance, such as: the setting of resistance Rb, the arranging of bleeder circuit, then repeat no more.

Change-over circuit has an a high-pressure side circuit HL and low-pressure side circuit LL (the low-pressure side circuit LL of the present embodiment is ground connection), and comprises one first high-pressure side rectifier cell DH1 and one first low-pressure side rectifier cell QL1, one second high-pressure side rectifier cell DH2 and one second low-pressure side rectifier cell QL2, inductance L 1 and an output capacitance C1.Wherein, the first high-pressure side rectifier cell DH1 and the first low-pressure side rectifier cell QL1 is serially connected with between high-pressure side circuit HL and low-pressure side circuit LL, and, define one first contact N1 between the first high-pressure side rectifier cell DH1 and the first low-pressure side rectifier cell QL1.Second high-pressure side rectifier cell DH2 and the second low-pressure side rectifier cell QL2 is serially connected with between high-pressure side circuit HL and low-pressure side circuit LL, and, define one second contact N2 between the second high-pressure side rectifier cell DH2 and the second low-pressure side rectification unit QL2 part.Inductance L 1 is connected between an AC power AC and the first contact N1, and this AC power AC and inductance L 1 are serially connected with between the first contact N1 and the second contact N2.Output capacitance C1 is connected between high-pressure side circuit HL and low-pressure side circuit LL.

In the present embodiment, the first high-pressure side rectifier cell DH1 and the second high-pressure side rectifier cell DH2 is two diodes, is forward connected to respectively between the first contact N1 and high-pressure side circuit HL and between the second contact N2 and high-pressure side circuit HL.First low-pressure side rectifier cell QL1 and the second low-pressure side rectifier cell QL2 is switch element.Therefore the running topology of this change-over circuit is similar to the change-over circuit of Fig. 2 A and Fig. 2 B.Switching current circuit for detecting 270 is connected to switch element QL1, QL2 or both connections simultaneously, to detect the On current flowing through switch element.Power factor modifier controller 260 is except passing through the On current of switching current circuit for detecting 270 detection switch element QL2, also by auxiliary induction L2, the inductive current of detecting in inductance L 1, so as to producing the conducting state of drive singal DRV Synchronization Control first low-pressure side rectifier cell QL1 and the second low-pressure side rectifier cell QL2.

Fig. 6 is the schematic diagram of the another embodiment of application circuit of a kind of power factor of the present invention modifier controller.The Main Differences of the embodiment of the present embodiment and Fig. 5 is the difference of switching current circuit for detecting 270,370.In the present embodiment, switching current circuit for detecting 370 comprise one first detecting diode DT1 and one second detect diode DT2.The cathode terminal that first cathode terminal and second detecting diode DT1 detects diode DT2 is connected the first contact N1 and the second contact N2 respectively.Anode tap and second anode tap detecting diode DT2 of the first detecting diode DT1 are connected in one the 3rd contact N3, and produce On current detection signal VCS in the 3rd contact N3.Therefore, compared to the switching current circuit for detecting 270 of Fig. 5, palpus series resistor is to switch element QL1, QL2 to detect the mode of On current, and the switching current circuit for detecting 370 of the present embodiment can reduce the generation of resistance conducting consume.

Fig. 7 is the schematic diagram of power factor modifier controller 400 1 embodiment of the present invention.Application circuit below for being applied to Fig. 6 for this power factor modifier controller 400 is described.The waveform of corresponding signal in application circuit, as ac voltage signal VAC, On current detection signal VCS and the waveform of input current Iin that produced by AC power AC of AC power AC, can refer to Fig. 8.

As shown in Figure 7, the power factor modifier controller 400 of the present embodiment comprises zero current circuit for detecting 420, On current circuit for detecting 440, feedback control circuit 450 and a switch element control circuit 460.Wherein, zero current circuit for detecting 420 has one first reed position circuit 422,1 first comparator COM1, one second comparator COM2 and a logical circuit 424.First reed position circuit 422, at least according to the negative potential part of an inductive current detection signal VZCD, produces a first potential change signal VZCD ' changed within the scope of positive potential.Zero current circuit for detecting 420 is according to this first potential change signal VZCD ', produces a zero current signal SZC control switch element (the first low-pressure side rectifier cell QL1 in switch Q1, Fig. 5 and Fig. 6 namely in Fig. 4 and the second low-pressure side rectifier cell QL2) conducting.

In the present embodiment, the positive input terminal of the first comparator COM1 receives the first potential change signal VZCD ', and negative input end receives one first reference potential Vr1, to produce one first comparison signal VCOM1.The negative input end of the second comparator COM2 receives the first potential change signal VZCD ', and positive input terminal receives one second reference potential Vr2, to produce one second comparison signal VCOM2.First logical circuit 424 receives the first comparison signal VCOM1 and the second comparison signal VCOM2, to produce zero current signal SZC.

In the present embodiment, the first logical circuit 424 has one first one shots OS1, one second one shots OS2 and one or door OR1.First one shots OS1 receives the first comparison signal VCOM1, and produces one first pulse signal PUL1 switching time in the high electronegative potential of the first comparison signal VCOM1.Second one shots OS2 receives the second comparison signal VCOM2, and produces one second pulse signal PUL2 switching time in the high electronegative potential of the second comparison signal VCOM2.Or door OR1 receives the first pulse signal PUL1 and the second pulse signal PUL2, to produce zero current signal SZC.

When alternating voltage VAC is in negative half period, please refer to Fig. 8 and Fig. 9 A, input current Iin is negative (namely electric current is flowed towards the direction of AC power AC left by inductance L 1), and input current Iin can shake between negative value and zero.As shown in Figure 9 A, when input current Iin rise level off to zero time, inductive current detection signal VZCD is converted to positive potential by negative potential.This inductive current detection signal VZCD, after the first reed position circuit 422 of the present embodiment is changed, produces and is presetting the first potential change signal VZCD ' carrying out between high electronegative potential changing.This presets high electronegative potential and is all greater than zero.With regard to an embodiment, above-mentioned default high potential is higher than the first reference potential Vr1 and the second reference potential Vr2, and above-mentioned default electronegative potential falls between the first reference potential Vr1 and the second reference potential Vr2.

In the present embodiment, the current potential of inductive current detection signal VZCD can be subject to the current potential impact of alternating voltage.The present embodiment utilizes the first reed position circuit 422 that inductive current detection signal VZCD is converted to the first potential change signal VZCD ', is namely the potential change of limit inductive current detection signal VZCD, is beneficial to the subsequent treatment of power factor modifier controller 400.

When the first potential change signal VZCD ' is increased beyond the first reference potential Vr1, the first comparison signal VCOM1 that the first comparator COM1 exports changes high potential into by electronegative potential.First one shots OS 1 detects the first comparison signal VCOM1 by electronegative potential to the conversion of high potential, produce the first pulse signal PUL1 control switch element QL1 immediately, QL2 conducting, that is the grid potential VG of switch element QL1, QL2 changes high potential into by electronegative potential.After switch element QL1, QL2 conducting, AC power AC starts to charge to inductance L 1.

Above-described embodiment utilizes the first comparator COM1 to compare the first potential change signal VZCD ' and the first reference potential Vr1, to reach control switch element QL1, the object of QL2 conducting.But, the present invention is not limited to this.As shown in Figure 9 A, because inductive current detection signal VZCD shakes between positive negative potential, by suitably setting the level of the first reference potential Vr1 ', the comparative result of inductive current detection signal VZCD and the first reference potential Vr1 ' also can be directly utilized to carry out control switch element QL1, QL2 conducting.

When alternating voltage VAC is in positive half cycle, please refer to Fig. 8 and Fig. 9 B, input current Iin just (namely electric current is flowed towards the direction of inductance L 1 by AC power AC) is, and input current Iin can shake between zero.As shown in Figure 9 B, when input current Iin decline level off to zero time, inductive current detection signal VZCD is converted to negative potential by positive potential.This inductive current detection signal VZCD, after the first reed position circuit 422 of the present embodiment is changed, produces and is presetting the first potential change signal VZCD ' carrying out between high electronegative potential changing.This presets high electronegative potential and is all greater than zero, and with regard to an embodiment, above-mentioned default high potential is higher than the first reference potential Vr1 and the second reference potential Vr2, and above-mentioned default electronegative potential is positioned between the first reference potential Vr1 and the second reference potential Vr2.

When the current potential of the first potential change signal VZCD ' drops to lower than the second reference potential Vr2, the second comparison signal VCOM2 that the second comparator COM2 exports changes high potential into by electronegative potential.Second one shots OS2 detects the second comparison signal VCOM2 by electronegative potential to the conversion of high potential, produces the second pulse signal PUL2 control switch element QL1 immediately, QL2 conducting.After switch element QL1, QL2 conducting, AC power AC starts to charge to inductance L 1.

Above-described embodiment utilizes the second comparator COM2 to compare the first potential change signal VZCD ' and the second reference potential Vr2, to reach control switch element QL1, the object of QL2 conducting.But, the present invention is not limited to this.As shown in Figure 9 B, because inductive current detection signal VZCD shakes between positive negative potential, by suitably setting the level of the second reference potential Vr2 ', the comparative result of inductive current detection signal VZCD and the second reference potential Vr2 ' also can be directly utilized to carry out control switch element QL1, QL2 conducting.In sum, with regard to another embodiment, by suitably setting the level of the first reference potential Vr1 ' and the second reference potential Vr2 ', the present invention can omit the first reed position circuit 422 and be unlikely to affect the normal operation of zero current circuit for detecting 420.

The zero current circuit for detecting 420 of the present embodiment utilizes the first comparator COM1 and the second comparator COM2 to detect inductive current detection signal VZCD respectively and corresponds to a Part I of the negative half period of alternating voltage VAC and the Part II corresponding to positive half cycle, fails the problem of the bidirectional current effectively detected on inductance to solve existing power factor modifier controller.

On current circuit for detecting 440 has one second reed position circuit 442, the 3rd comparator COM3, one the 4th comparator COM4 and one second logical circuit 444.Second reed position circuit 442 at least produces a second potential change signal VCS ' changed within the scope of positive potential according to the negative potential part of an On current detection signal VCS.On current circuit for detecting 440 produces a pick-off signal SCS control switch element QL1 according to this second potential change signal VCS ', and QL2 interrupts.3rd comparator COM3 receives the second potential change signal VCS ' and one the 3rd reference potential Vr3, to produce one the 3rd comparison signal VCOM3,4th comparator COM4 receives On current detection signal VCS and the 4th reference potential Vr4, to produce one the 4th comparison signal VCOM4.Above-mentioned 3rd reference potential Vr3 and the 4th reference potential Vr4 can be equipotential or different potentials.The present embodiment setting the 3rd reference potential Vr3 and the 4th reference potential Vr4 is equipotential, to simplify circuit design.Second logical circuit 444 receives the 3rd comparison signal VCOM3 and the 4th comparison signal VCOM4, and to produce pick-off signal SCS control switch element QL1, QL2 turns off.

In the present embodiment, second reed position circuit 442 is a booster circuit (level shifter), in order to the negative potential part by On current detection signal VCS, entirety upwards promotes a default voltage Va, to produce a second potential change signal VCS ' changed within the scope of positive potential, its current potential is equal to VCS+Va.

When alternating voltage VAC is in negative half period, please refer to Figure 10 A, input current Iin shakes between negative value and zero, and meanwhile, On current detection signal VCS also drops on negative potential.With regard to the 3rd comparator COM3, because the 3rd reference potential Vr3 is just, On current detection signal VCS is negative, and therefore, the 3rd comparator COM3 can continue the 3rd comparison signal VCOM3 exporting electronegative potential.But, On current detection signal VCS is upwards promoted a default voltage Va to produce the second potential change signal VCS ' by the second reed position circuit 442 of the present embodiment, and the 3rd reference potential Vr3 is fallen within the scope of the potential change of the second potential change signal VCS '.

When switch element QL1, QL2 conducting (when the grid potential VG of switch element is in high potential), AC power AC is charged for inductance L 1 by switch element QL1, QL2.Now, the current potential of On current detection signal VCS can decline gradually along with the increase of the absolute value of input current Iin.When the potential drop of the second potential change signal VCS ' be low to moderate be less than the 3rd reference potential Vr3 time, the 3rd comparison signal VCOM3 that the 3rd comparator COM3 exports high level immediately turns off with control switch element QL1, QL2.

Please refer to Fig. 6 and Figure 10 A simultaneously, the switching current circuit for detecting 370 of the present embodiment must exceed in the potential difference of the current potential of the second contact N2 or the first contact N1 and the 3rd contact N3 detects diode DT1, during the forward bias voltage drop of DT2, could the On current of effective detection switch element QL1 or QL2.Furthermore, at the beginning of switch element QL1, QL2 conducting, the current potential of the first contact N1 is not yet reduced to is enough to conducting detecting diode DT1, and the current potential of On current detection signal VCS can maintain zero potential.Subsequently, after the current potential of the first contact N1 and the potential difference of the 3rd contact N3 exceed and detect diode DT1, the current potential of On current detection signal VCS just can start along with the increase of the On current flowing through switch element QL1 and reduce gradually.

On the other hand, please refer to shown in Figure 10 B, when alternating voltage VAC is in positive half cycle, input current Iin is shaking between zero.But, diode DT1 is detected because switching current circuit for detecting 370 must exceed in the potential difference of the current potential of the second contact N2 or the first contact N1 and the 3rd contact N3, during the forward bias voltage drop of DT2, the On current of effective detection switch element QL1 or QL2 of ability, now, the situation of On current detection signal VCS when waveform and the alternating voltage VAC of On current detection signal VCS are in negative half period is identical.Also therefore, On current circuit for detecting 440 is in fact also that the comparative result control switch element QL1 according to the 4th comparator COM4, QL2 turn off.

Get back to Fig. 7, power factor Correction and Control circuit 400 separately has feedback control circuit 450 control switch element QL1, and QL2 turns off.Please refer to Fig. 4 simultaneously, Fig. 5 and Fig. 6, feedback control circuit 450 obtains by a bleeder circuit (being made up of resistance R2 and R3) the feedback voltage signal VFB that corresponds to output voltage, and produces a feedback control signal SFB according to this feedback voltage signal.In the present embodiment, this feedback control signal SFB, above-mentioned 3rd comparison signal VCOM3 and the 4th comparison signal VCOM4 input or door OR2, to produce pick-off signal SCS simultaneously.But, the present invention is not limited to this.Above-mentioned 3rd comparison signal VCOM3 and the 4th comparison signal VCOM4 can first input one or door, the output signal of this or door more therewith feedback control signal SFB input another or door simultaneously, to produce pick-off signal SCS control switch element QL1, QL2 turns off.

The switch element control circuit 460 of power factor modifier controller 400 has a flip-flop.Two receiving terminal S of this flip-flop, R receives zero current signal SZC and pick-off signal SCS respectively, and its inverse output terminal QB exports a drive singal DRV in order to control switch element QL1, the conducting state of QL2.In the present embodiment, the high-low voltage change of drive singal DRV is contrary with the change of the grid potential of switch element QL1, QL2.But, the present invention is not limited to this.The difference of the difference of drive circuit (not shown), the difference of switch element or the change-over circuit operation topology connected according to switch element control circuit 166, the signal that the forward output of flip-flop also can be utilized to export or simultaneously utilize flip-flop forward and the signal oppositely exported as drive singal DRV.

The power factor modifier controller of Fig. 7 is applied to the situation of the application circuit of Fig. 5, can be different because of the difference of the switching current circuit for detecting 270 used.Utilize resistance to detect at switching current circuit for detecting 270 and flow through switch element QL1, when the electric current of QL2, the waveform of On current detection signal VCS is because alternating voltage VAC is in positive half cycle or negative half period and variant.

When alternating voltage VAC is in positive half cycle, the current potential of On current detection signal VCS can along with flowing through switch element QL1, the increase of the On current of QL2 and raising gradually.Now, the current potential of the second potential change signal VCS ' produced by the second reed position circuit 442 can maintain on the 3rd reference potential Vr3, and the 3rd comparator COM3 continues the 3rd comparison signal VCOM3 exporting electronegative potential.But, with regard to the 4th comparator COM4, the 4th reference potential Vr4 is set within the scope of the potential change of On current detection signal VCS.When the current potential of On current detection signal VCS rises to higher than the 4th reference potential Vr4, the 4th comparison signal VCOM4 that the 4th comparator COM4 exports high level immediately turns off with control switch element QL1, QL2.

When alternating voltage VAC is in negative half period, the current potential of On current detection signal VCS is negative, and can along with flowing through switch element QL1, and the increase of the On current of QL2 becomes more negative.Now, the current potential of On current detection signal VCS maintains under the 4th reference potential Vr4, and the 4th comparator COM4 continues the 4th comparison signal VCOM4 exporting electronegative potential.On the other hand, with regard to the 3rd comparator COM3, the second potential change signal VCS ' that the current potential of On current detection signal VCS upwards promotes and produces by the second reed position circuit 442, the 3rd reference potential Vr3 can fall within the scope of the potential change of the second potential change signal VCS '.When the current potential of the second potential change signal VCS ' drops to lower than the 3rd reference potential Vr3, the 3rd comparator COM3 exports the 3rd comparison signal VCOM3 control switch element QL1 of high potential immediately, and QL2 turns off.

Therefore, the On current circuit for detecting 440 of the present embodiment utilizes the 3rd comparator COM3 and the 4th comparator COM4 detection switch element QL1 respectively, QL2 corresponds to the positive half cycle of alternating voltage VAC and the On current of negative half period, effectively cannot detect flow through switch element QL1, the problem of the conduct current in either direction of QL2 to solve existing power factor modifier controller.

In the embodiment of Fig. 7, the first potential change signal VZCD ' that inductive current detection signal VZCD produces through the first reed position circuit 422 conversion, exports the positive input terminal of the first comparator COM1 and the negative input end of the second comparator COM2 to simultaneously.By contrast, the second 442, reed position circuit is a booster circuit, after On current detection signal VCS is converted to the second potential change signal VCS ' by it, only this second potential change signal VCS ' is only exported to the negative input end of the 3rd comparator COM3.The positive input terminal of the 4th comparator COM4 is then receive On current detection signal VCS to judge.

But, the present invention is not limited to this.The factors such as the setting of the reference potential of the level height of the visual signal that it is detected of type of the reed position circuit that zero current circuit for detecting 420 and On current circuit for detecting 440 use, level excursion and comparator adjust.Secondly, the On current detection signal that the switching current circuit for detecting 370 that the embodiment due to Fig. 6 provides produces can't be subject to the aspect effect of On current haply.Therefore, the controller being applied to this application circuit can omit the 4th comparator COM4 further and be unlikely to affect its normal operation.

Secondly, power factor modifier controller of the present invention, except the non-bridge type power factor correction circuit being applicable to Fig. 5 and Fig. 6, also can be directly applied for existing full-bridge type power factor correction circuit as shown in Figure 4.In addition, although the present invention is only described, but the present invention is not limited to this for the non-bridge type power factor correction circuit of Fig. 5 and Fig. 6.The technical characteristic of power factor modifier controller of the present invention because the change of the positive-negative half-cycle of alternating voltage derives current sense problem, but not does not limit the kind of the power factor correction circuit that the present invention should be suitable for for power factor correction circuit.By the drive circuit of Modulating Power factor modifier controller, the present invention also can be applicable to the non-bridge type power factor correction circuit of other kinds, the non-bridge type power factor correction circuit as shown in Fig. 3 A and Fig. 3 B or the non-bridge type power factor correction circuit of other types.Although the drive singal that the embodiment of Fig. 7 exports controls two switch element QL1 of application circuit, QL2 conducting simultaneously and cut-off, but the present invention is also not limited thereto.The drive singal DRV that the embodiment of Fig. 7 exports, also can in order to drive the switch element of two alternate conduction by after suitable adjustment, to plant the demand of non-bridge type power factor correction circuit in response to him.

No matter AC power AC is in positive half cycle or negative half period output, power factor modifier controller of the present invention effectively can detect the induction coil current of non-bridge type power factor correction circuit and the On current of switch element, thus can solve non-bridge type power factor correction circuit control problem not easily.In addition, power factor modifier controller of the present invention also not only can only be applicable to non-bridge type power factor correction circuit, as shown in Figure 4, power factor modifier controller of the present invention is also applicable to existing full-bridge type power factor correction change-over circuit, and need not change circuit design.

But the above, be only preferred embodiment of the present invention, scope of the present invention can not be limited with this, i.e. all simple equivalence changes of doing according to the claims in the present invention and description and amendment, all still belong in scope that the present invention contains.Any embodiment of the present invention or claim must not reach disclosed whole object or advantage or feature in addition.In addition, summary and title are only used to the use of auxiliary patent document retrieval, are not used for limiting the scope of the invention.

Claims

1. a power factor modifier controller, is characterized in that, in order to control the conducting state of at least one switch element of a non-bridge type power factor correction circuit, this power factor modifier controller comprises:

One feedback control circuit, according to a feedback voltage signal, produces a feedback control signal in order to control this switching elements interrupt;

One On current circuit for detecting, there is one second clamp circuit, this second clamp circuit is at least according to the negative potential part of an On current detection signal, produce a second potential change signal changed within the scope of positive potential, this On current circuit for detecting is at least according to this second potential change signal, produce a pick-off signal to control this switching elements interrupt, the On current that wherein this On current detection signal flows through this switch element by detecting is produced, and this second potential change signal is produced by this On current detection signal entirety upwards promotes default voltage;

One switch element control circuit, according to this feedback control signal and this pick-off signal, controls this switching elements interrupt; And

One zero current circuit for detecting, at least according to an inductive current detection signal, produce a zero current signal, this switch element control circuit controls this switching elements conductive according to this zero current signal, and this zero current circuit for detecting also comprises:

One first clamp circuit, this first clamp circuit is at least according to the negative potential part of this inductive current detection signal, produce a first potential change signal changed within the scope of positive potential, this zero current circuit for detecting at least according to this first potential change signal, produces this zero current signal.

2. a kind of power factor modifier controller as claimed in claim 1, it is characterized in that, wherein, this zero current circuit for detecting also comprises one first comparator, one second comparator and one first logical circuit, the positive input terminal of this first comparator receives this first potential change signal, negative input end receives one first reference potential, to produce one first comparison signal, the negative input end of this second comparator receives this first potential change signal, positive input terminal receives one second reference potential, to produce one second comparison signal, this first logical circuit is according to this first comparison signal and this second comparison signal, produce this zero current signal.

3. a kind of power factor modifier controller as claimed in claim 2, it is characterized in that, wherein, this first logical circuit comprises one first one shots, one second one shots and one or door, this first one shots receives this first comparison signal, and produce one first pulse signal switching time in the high electronegative potential of this first comparison signal, this second one shots receives this second comparison signal, and produce one second pulse signal switching time in the high electronegative potential of this second comparison signal, this or door receive this first pulse signal and this second pulse signal, to produce this zero current signal.

4. a kind of power factor modifier controller as claimed in claim 1, it is characterized in that, wherein, this On current circuit for detecting comprises one the 3rd comparator, one the 4th comparator and one second logical circuit, wherein, 3rd comparator receives this second potential change signal and one the 3rd reference potential, to produce one the 3rd comparison signal, 4th comparator receives this On current detection signal and one the 4th reference potential, to produce one the 4th comparison signal, this second logical circuit is at least according to the 3rd comparison signal and the 4th comparison signal, produce this pick-off signal.

5. a kind of power factor modifier controller as claimed in claim 4, is characterized in that, wherein, this second logical circuit at least according to this feedback control signal, the 3rd comparison signal and the 4th comparison signal, produces this pick-off signal.

6. a kind of power factor modifier controller as claimed in claim 1, is characterized in that, wherein, this second clamp circuit is a booster circuit.

7. a non-bridge type power factor correction circuit, is characterized in that, comprising:

One change-over circuit, have a high-pressure side circuit and a low-pressure side circuit, this change-over circuit comprises:

One first high-pressure side rectifier cell and one first low-pressure side rectifier cell, be serially connected with between this high-pressure side circuit and this low-pressure side circuit, and, define one first contact between this first high-pressure side rectifier cell and this first low-pressure side rectifier cell;

One second high-pressure side rectifier cell and one second low-pressure side rectifier cell, be serially connected with between this high-pressure side circuit and this low-pressure side circuit, and, define one second contact between this second high-pressure side rectifier cell and this second low-pressure side rectifier cell;

At least one inductance, is connected between an AC power and this first contact, and this AC power and this inductance are serially connected with between this first contact and this second contact; And

One output capacitance, is connected between this high-pressure side circuit and this low-pressure side circuit;

Wherein, this first high-pressure side rectifier cell, this first low-pressure side rectifier cell, this second high-pressure side rectifier cell and this second low-pressure side rectifier cell at least one of them is a switch element;

One switching current circuit for detecting, is connected to this switch element, and detecting flows through an On current of this switch element, to produce an On current detection signal; And

One power factor modifier controller, comprising:

One feedback control circuit, according to a feedback voltage signal of the output voltage corresponding to this change-over circuit, produces a feedback control signal in order to control this switching elements interrupt;

One On current circuit for detecting, there is one second clamp circuit, this second clamp circuit is at least according to the negative potential part of this On current detection signal, produce a second potential change signal changed within the scope of positive potential, this On current circuit for detecting is at least according to this second potential change signal, produce a pick-off signal to control this switching elements interrupt, the On current that wherein this On current detection signal flows through this switch element by detecting is produced, and this second potential change signal is produced by this On current detection signal entirety upwards promotes default voltage;

8. non-bridge type power factor correction circuit as claimed in claim 7, it is characterized in that, wherein, this zero current circuit for detecting also comprises one first comparator, one second comparator and one first logical circuit, the positive input terminal of this first comparator receives this first potential change signal, negative input end receives one first reference potential, to produce one first comparison signal, the negative input end of this second comparator receives this first potential change signal, positive input terminal receives one second reference potential, to produce one second comparison signal, this first logical circuit is according to this first comparison signal and this second comparison signal, produce this zero current signal.

9. non-bridge type power factor correction circuit as claimed in claim 8, it is characterized in that, wherein, this first logical circuit comprises one first one shots, one second one shots and one or door, this first one shots receives this first comparison signal, and produce one first pulse signal switching time in the high electronegative potential of this first comparison signal, this second one shots receives this second comparison signal, and produce one second pulse signal switching time in the high electronegative potential of this second comparison signal, this or door receive this first pulse signal and this second pulse signal, to produce this zero current signal.

10. non-bridge type power factor correction circuit as claimed in claim 7, it is characterized in that, wherein, this On current circuit for detecting comprises one the 3rd comparator, one the 4th comparator and one second logical circuit, wherein, 3rd comparator receives this second potential change signal and one the 3rd reference potential, to produce one the 3rd comparison signal, 4th comparator receives this On current detection signal and one the 4th reference potential, to produce one the 4th comparison signal, this second logical circuit is at least according to the 3rd comparison signal and the 4th comparison signal, produce this pick-off signal.

11. non-bridge type power factor correction circuits as claimed in claim 7, is characterized in that, wherein, this switching current circuit for detecting comprises a resistance, and this resistance is connected to this switch element, in order to this On current is converted to this On current detection signal.

12. non-bridge type power factor correction circuits as claimed in claim 7, it is characterized in that, wherein, this switching current circuit for detecting comprises one first detecting diode and one second and detects diode, the cathode terminal of this first detecting diode is connected this first contact and this second contact respectively with this second anode tap detecting diode, anode tap and this second anode tap detecting diode of this first detecting diode are connected in one the 3rd contact, and produce this On current detection signal in the 3rd contact.

13. non-bridge type power factor correction circuits as claimed in claim 7, it is characterized in that, wherein, this the first high-pressure side rectifier cell and this second high-pressure side rectifier cell are two diodes, forward be connected to this first contact and this high-pressure side circuit and this second contact and this high-pressure side circuit respectively, this the first low-pressure side rectifier cell and this second low-pressure side rectifier cell are two switch elements, and this power factor modifier controller controls this two switch elements simultaneously.