CN200969517Y

CN200969517Y - Simple null current commutation circuit

Info

Publication number: CN200969517Y
Application number: CNU2006201231339U
Authority: CN
Inventors: 林国藩
Original assignee: FSP Technology Inc
Current assignee: FSP Technology Inc
Priority date: 2006-08-09
Filing date: 2006-08-09
Publication date: 2007-10-31
Anticipated expiration: 2016-08-09

Abstract

The utility model is a simple zero-current switching circuit. First and second winding groups with relative turn ratio are electrically connected between a dumping inductor of a power factor corrector, an output diode, and a guide circuit switch, the leakage inductance of the first winding group produces back electromotive force to keep the guide circuit switch in zero-current switch state, when collocation energy conversion circuit produces reverse recovery status in the output diode, reverse energy is stored with the turns of the second winding group relative to the turns of the first winding group, and is recovered to the output capacitance of the power factor corrector to reduce reverse recovery time of the output diode, thus a zero-current switching circuit with simple design and high efficiency is formed.

Description

Simple and easy zero current commutation circuit

Technical field

The utility model relates to a kind of simple and easy zero current commutation circuit, especially a kind of reverse energy that produces under the power factor corrector transition status needs through steps such as energy storage, discharges reverse energy to be utilized the also zero current commutation circuit of cpable of lowering power switching energy loss again.

Background technology

The power factor corrector zero current commutation circuit technology that is applied to existing switched power supplier can be with reference to as TaiWan, China patent announcement No. 279514 and I223135 number, in zero current commutation circuit technology, the actuating switch handoff loss (the best is zero handoff loss) that how to reduce power factor corrector reduces electromagnetic interference problem, it is focus technology in each patented technology, wherein, in No. 279514 patent, then utilize electric capacity, inductance, the power consumption circuit type that pulsactor and resistance are formed is eliminated the backward recovery electric current and is improved the electric power factor and improve power consumption efficiency, and in the I223135 patent, power conversion circuits is more proposed with inductance, storage capacitor and several diodes and this pulsactor constitute current circuit, under different sequential, reclaim the reverse energy that power factor corrector produces because of the backward recovery state, and through energy storage, steps such as discharge make reverse energy demand be sent to power output end and utilize, and the operating efficiency of more effective bring to power factor correcting device, but, still exist and should strengthen part again at this technology, be described as follows:

One, this patented technology is set up inductance L 3 will increase the inductance magnetic loss than original single pulsactor, and the cost that increases is also higher.

Two, the reverse energy recuperation size of this patented technology depends on this inductance L 3 fully, if be in heavy condition under or high power power supply design time, because of inductance L 3 induction reactance are fixed, so with respect to light condition or lower wattage power supply supply, the backward recovery time of output diode will be extended, and causes more magnetic losses.

Three, the ability of the driving pulsactor of this patented technology depends on the size of current of 1 pair of capacitor C of resistance R, 3 discharges, again must be greater than the work period because of discharge time, so discharge current value can't be strengthened, and causes inductance L 2 saturated incomplete, resistance R 1 is consumed to be increased.

The utility model content

Main purpose of the present utility model is to solve above-mentioned defective, avoids the existence of defective.

In order to realize this purpose, the utility model provides a kind of simple and easy zero current commutation circuit, the actuating switch that is used for power controlling factor correcting device is a zero current condition opening and closing under the switching start, this power factor corrector includes the energy storage inductor that receives electric power after the rectification and carry out the energy storage discharge, be electrically connected on output diode and the output capacitance between this energy storage inductor and the power output end and be electrically connected on actuating switch and controller between this energy storage inductor and the output diode, and this zero current commutation circuit includes:

Be connected in first winding between this energy storage inductor, the output diode, and second winding that this first winding is the turn ratio winding by relative this first winding is connected to this actuating switch, and produce back electromotive force with the leakage inductance of this first winding, making actuating switch is the zero current switching state when breakdown action;

Power conversion circuits, be to form power circuit with this power factor corrector, this first winding, this second winding, this power conversion circuits includes several diodes and electric capacity and resistance, produce under the backward recovery state at this output diode, turn ratio with relative first winding of this second winding stores reverse energy and is recycled to output capacitance, and realizes that this output diode can shorten the effect of backward recovery time.

Alternatively, this first winding and this second winding are reverse winding kenel.

By this design, thereby reduce the consumption of resistance, and avoided the loss of more magnetic loss and resistance R 1 thereof, so constitute Simple Design but high efficiency zero current commutation circuit has reduced production cost.

Description of drawings

Fig. 1 is an enforcement circuit diagram of the present utility model.

Fig. 2 is the work wave schematic diagram of the utility model in different sequential.

Fig. 3～9th, the utility model is at the current circuit schematic diagram of different sequential.

Embodiment

Relevant detailed description of the present utility model and technology contents, existing conjunction with figs. is described as follows:

See also Fig. 1, it is enforcement circuit diagram of the present utility model, as shown in the figure: the utility model is a kind of simple and easy zero current commutation circuit, the actuating switch Q1 that is mainly used in power controlling factor correcting device is a zero current condition opening and closing under the change action, electric power carried out the energy storage inductor L1 that energy storage is discharged after this power factor corrector included the reception rectification, be electrically connected on output diode D1 and output capacitance C4 between this energy storage inductor L1 and the power output end Vout, and be electrically connected on actuating switch Q1 and controller 10 between this energy storage inductor L1 and the output diode D1, this zero current commutation circuit includes and is connected in this energy storage inductor L1, the first winding N1 between the output diode D1, and the second winding N2 that this first winding N1 is the reverse winding of turn ratio by relative this first winding N1 is connected to this actuating switch Q1, and utilize the leakage inductance of this first winding N1 to produce back electromotive force, making actuating switch Q1 is the zero current switching state when breakdown action, and possess power conversion circuits 20 and this power factor corrector, this first winding N1, this second winding N2 forms power circuit, this power conversion circuits 20 includes several diodes D2, D3, D4 and capacitor C 1, C2, produce under the backward recovery state at this output diode D1, turn ratio with the relative first winding N1 of this second winding N2 stores reverse energy and is recycled to output capacitance C4, thereby reaches the effect that this output diode D1 can shorten the backward recovery time.

For making the auditor can understand the utility model technology fast, see also shown in Figure 2ly, Fig. 2 is the utility model each voltage and current waveform under different sequential, below will further specify the physical circuit operation principle:

T0 sequential (as shown in Figure 3): be the T6 sequential that continues, at this moment under the preface, operating voltage and electric current all are in stable state, capacitor C 1 is kept existing discharge loop state, I2 consumes through resistance R 1, and provide reverse bias to stop diode D2 and D4 conducting, the first winding N1 then enters saturation condition and presents short circuit, actuating switch Q1 does not open as yet, so output energy I1 provides due energy by energy storage inductor L1, the first winding N1 and output diode D1 to power output end Vout by front-end rectifier.

T1 sequential (as shown in Figure 4): at this moment under the preface, actuating switch Q1 enters the unlatching switching state, opening moment because the saturated discharge condition that is initially located in of the first winding N1, and electric current I 2 is still kept original direction and is flowed, at this moment, back electromotive force state by the first winding N1 leakage inductance draws actuating switch Q1 to carry the electric current I 3 that is produced and offsets with the current opposite in direction of electric current I 4, institute is so that actuating switch Q1 is in the zero current switching state when activating in moment, therefore, actuating switch Q1 will can not produce handoff loss and effectively avoid the electromagnetic interference phenomenon.

T2 sequential (as shown in Figure 5): actuating switch Q1 has been in opening, this moment, backward recovery electric current I 5 was through the first winding N1 and the second winding N2 extremely holds and according to the ratio of I5=I3 (N1/N2-1) output diode D1 is discharged, the while also with the backward recovery store energy in energy storage inductor L1.

T3 sequential (as shown in Figure 6): preface interval at this moment, the reverse energy of output diode D1 has discharged and has finished, be stored in before backward recovery energy among the energy storage inductor L1 by resistance R 1 and diode D2 to capacitor C 2 chargings (being denoted as backward current I7).It is noted that this backward current I7 produces according to the ratio of I5=I3 (N1/N2-1), this action with reverse energy from energy storage inductor L1 unloading in capacitor C 2, when electric current I 7 is zero, stop.

T4 sequential (as shown in Figure 7): preface interval at this moment, will be the stable state conducting state, the backward recovery state of output diode D1 is finished, and makes pulsactor maintain complete saturation condition and electric current I 3 flows through the second winding N2 always.

T5 sequential (as shown in Figure 8): preface interval at this moment, actuating switch Q1 will switch to closed condition, at first the electric weight of capacitor C 2 arrives power output end Vout by the path of the first winding N1, capacitor C 2 and diode D3 with former energy storage energy recuperation, produce the electric current I 10 hold-off voltage climb rates simultaneously, handoff loss when realize reducing actuating switch Q1 and closing also shortens stable state time of the second winding N2 leakage inductance together.Then actuating switch Q1 voltage Vds is higher than power output end Vout, forces capacitor C 1 in the circuit, diode D4 conducting, produces electric current I 9 restriction actuating switch Q1 voltage Vds and continues to climb, till the leakage inductance current stabilization of the first winding N1.

T6 sequential (as shown in Figure 9): preface interval at this moment, the reverse energy of capacitor C 2 former energy storage discharges fully and is recycled to output capacitance C4 and utilizes, the voltage difference of capacitor C 2 is classified as zero, so, diode D3 will form not on-state, and output diode D1 is because of reaching the forward bias voltage drop conducting, so electric current I 11 will be via the first winding N1, output diode D1, to power output end Vout, capacitor C 1 left side is higher than power output end Vout because of actuating switch Q1 closes current potential simultaneously, so electric current I 9 forms conducting because of diode D4 forward bias voltage drop, electric current I 9 will be through the second winding N2, capacitor C 1, diode D4 is to power output end Vout and to capacitor C 1 charging, wherein I11 upwards climbs with the positive slope of the capacitor C 1 voltage ratio first winding N1 leakage inductance, I9 descends with negative slope, just stops when I9 is zero.Then get back to the T0 sequential at last and repeat above-listed sequential action.

Can obviously find out from above-listed explanation, because the utility model is that the relative first winding N1 is electrically connected power conversion circuits 20 by the reverse winding second winding N2 of turn ratio, the design of only keeping single pulsactor can be minused the magnetic loss and the copper loss problem of another inductance (known in the I223135 patent), and, reverse energy is with first, two winding N1, the turn ratio of N2 decides, so no matter which kind of state power output end Vout is in, all can keep unanimity and shorter output diode D1 backward recovery time, and reclaim reverse energy according to the turn ratio ratio, therefore obtain lower weber V*T on the first winding N1, so the magnetic loss of pulsactor (the first winding N1) has also more reduced, also have in the T4 sequential, promptly flow through the second winding N2 by electric current I 3 makes pulsactor (the first winding N1) maintain complete saturation condition always, and significantly shorten the time that electric current flows through capacitor C 1, and reach the purpose that reduces resistance R 1 consumption.Therefore, the utility model will more design applicable to the high power power supply.

Being preferred embodiment of the present utility model only in sum, is not to be used for limiting practical range of the present utility model.Be that all equivalences of doing according to the content of the utility model claim change and modification, all should be technology category of the present utility model.

Claims

1. simple and easy zero current commutation circuit, the actuating switch (Q1) that is used for power controlling factor correcting device is a zero current condition opening and closing under the switching start, electric power carried out the energy storage inductor (L1) that energy storage is discharged after described power factor corrector included the reception rectification, be electrically connected on output diode (D1) and output capacitance (C4) between described energy storage inductor (L1) and the power output end (Vout), and be electrically connected on actuating switch (Q1) and controller (10) between described energy storage inductor (L1) and the output diode (D1), it is characterized in that described zero current commutation circuit then includes:

Be connected in first winding (N1) between described energy storage inductor (L1), the output diode (D1), and described first winding (N1) is connected to described actuating switch (Q1) by described relatively first winding (N1) for second winding (N2) of turn ratio winding, and produce back electromotive force with the leakage inductance of described first winding (N1), making actuating switch (Q1) is the zero current switching state when breakdown action;

Power conversion circuits (20), be to form power circuit with described power factor corrector, described first winding (N1), described second winding (N2), described power conversion circuits (20) includes several diodes (D2, D3, D4) and electric capacity (C1, C2) and resistance (R1), produce under the backward recovery state at described output diode (D1), turn ratio with relative first winding of described second winding (N2) (N1) stores reverse energy and is recycled to output capacitance (C4), and realizes that described output diode (D1) can shorten the effect of backward recovery time.

2. simple and easy zero current commutation circuit according to claim 1 is characterized in that, described first winding (N1) is reverse winding kenel with described second winding (N2).