CN2309666Y

CN2309666Y - Two-way power converter

Info

Publication number: CN2309666Y
Application number: CN 97224641
Authority: CN
Inventors: 李善根
Original assignee: SANQIANG SCIENCE AND TECHNOLOGY INDUSTRY Co Ltd ZHEJIANG
Current assignee: SANQIANG SCIENCE AND TECHNOLOGY INDUSTRY Co Ltd ZHEJIANG
Priority date: 1997-08-22
Filing date: 1997-08-22
Publication date: 1999-03-03
Anticipated expiration: 2007-08-22

Abstract

The utility model belongs to a switched-mode power supply converter, particularly a two-way power supply converter which comprises a power derailing switch, a transformer device, a rectifying filter circuit and a control circuit. The output end of the transformer device is connected with the input end of the rectifying filter circuit. The utility model is characterized in that a resonance circuit is arranged between the power derailing switch and the transformer device. The utility model has the advantages of reasonable structural design, reliable performance, wide range of application, etc., and the power derailing switch is turned on or off in zero-voltage state.

Description

The two-way forward type supply convertor

The utility model belongs to switch-mode power converter, particularly relates to a kind of two-way forward type supply convertor.

In background technology, the two-way forward type supply convertor is mainly by the power switch device, two main transformers, output circuit and control circuits constitute, deficiencies such as when it used, the power tube switching loss was big, absorb the circuit weak effect, noise is bigger, its range of application is restricted.

The two-way forward type supply convertor that provides a kind of power switch device to turn on and off under zero-voltage state is provided the purpose of this utility model.

The purpose of this utility model is achieved in that it comprises power switch device, device for transformer, current rectifying and wave filtering circuit and control circuit, the output of device for transformer and the input of current rectifying and wave filtering circuit join, control circuit matches with power switch device and current rectifying and wave filtering circuit respectively, it is characterized in that being provided with resonant circuit between power switch device and the device for transformer.

The utility model is compared with background technology, owing between power switch device and device for transformer, be provided with resonant circuit, make the open and close under zero-voltage state of power switch device, it is little to have the switch transition loss, noise is low, the operating frequency height, advantages such as good reliability have enlarged the range of application of supply convertor.

Below in conjunction with drawings and Examples, the utility model is specified as follows:

Fig. 1 is a circuit block diagram of the present utility model

Fig. 2 is circuit theory diagrams of the present utility model

With reference to accompanying drawing: the utility model comprises power switch device 1, device for transformer 3, current rectifying and wave filtering circuit 4 and control circuit 5, the input end of the output of device for transformer 3 and current rectifying and wave filtering circuit 4 is joined, control circuit 5 matches with power switch device 1 and current rectifying and wave filtering circuit 4, is provided with resonant circuit 2 between power switch device 1 and device for transformer 3.

Power switch device 1 is made of four device for power switching M1～M4, they can be power field effect pipe (MOSFET), it also can be the IGBT pipe, they all have three electrodes, be grid, source electrode and drain electrode, can promptly open or turn-off drain electrode and the source electrode that is connected on the major loop by the variation of control gate pole tension.Device for transformer 3 is made of transformer T1 and transformer T2, between power switch device 1 and device for transformer 3, be provided with resonant circuit 2, resonant circuit 2 is by diode D1～D12, capacitor C 1～C4 and inductance L 1, L2 forms, capacitor C 1, the elementary winding upper end of the series arm that diode D1 and inductance L 1 constitute and positive source and transformer T1 joins, capacitor C 3, the first utmost point winding upper end of the series arm that diode D3 and inductance L 2 constitute and positive source and transformer T2 joins, at transformer T1, join with diode in series D2 capacitor C 2 branch roads and diode D4 capacitor C 4 branch roads respectively between the lower end of the elementary winding of T2 and the power cathode, in inductance L 1, be connected to diode D9 between the upper end of L2 and the power cathode respectively, D11, at transformer T1, be connected to diode D10 respectively between the elementary winding lower end of T2 and the positive source, D12, diode D5, the two ends of D8 are connected on diode D1 respectively, the anode of D4 and negative electrode; The two ends of diode D7, D6 are connected on anode and the negative electrode of diode D2, D3 respectively.Between positive source and inductance L 1, L2, be connected to device for power switching M1, M3 respectively, between elementary winding of transformer T1, T2 and power cathode, be connected to device for power switching M2, M4 respectively.Two secondary winding of transformer T1, T2 and diode D13, D14, D15, inductance L 3 and capacitor C 5 constitute current rectifying and wave filtering circuits 4, are connected to voltage or current sampling signal loop between the output of inductance L 3 and the control circuit 5.Control circuit 5 adopts commercially available UC3875 chip or other resonance control chips, its control end a1a2, b1b2, c1c2, d1d2 joins with grid and the source electrode of device for power switching M1～M4 respectively, control circuit 5 is by control end a1a2, b1b2, c1c2, d1d2 takes turns driving power switching device M1～M4, when M1 and M2 conducting simultaneously, transformer T1, inductance L 1 is connected with input voltage, its secondary output positive voltage is delivered to load through current rectifying and wave filtering circuit 4 elimination clutters, in like manner, work as M3, when 5 controls of the controlled circuit of M4 and conducting, transformer T2, inductance L 2 is connected with input voltage, make secondary output current, because T1, T2 is a forked working in turn, its secondary normal shock mode that is connected into again, be T1, T2 takes turns output current, therefore its power is superposition, T1, T2 takes turns to operate and helps transformer T1, distributing of T2 heat, the signal that sends when control circuit 5 make device for power switching M1 by the time, flow to transformer T1, the electric current of inductance L 1 can not pass through from M1, but because of the capacitor C in parallel with it 1 arranged, it is by diode D1 and transformer T1 and inductance L 1 connection, so in the moment that M1 ends suddenly, because of capacitor C 1 both end voltage can not be suddenlyd change, make the M1 both end voltage also can keep no-voltage constant in moment, the electric current that flows to transformer T1 is then at moment C1 and the D1 of flowing through that change its course, thereby turn to the process of ending from conducting at M1, realized the no-voltage shutoff, M1 is turned to the transient process of cut-off region from the saturation region through the amplification region, all be in zero-voltage state, its transition loss is zero, continuation circulation along with electric current on the inductance L 1, capacitor C 1 is constantly charged, the last voltage of C1 constantly raises, be terminated at the positive pole of defeated people's power supply because of one of C1, when C1 goes up voltage more than or equal to input voltage, sustained diode 4 is with conducting, and the residual current in the inductance L 1 changes the negative pole that returns input current from D9; At this moment, also conducting of diode D5 makes in the drain electrode of device for power switching M1 voltage be clamped under the C1 on the terminal voltage, and promptly the negative terminal current potential with the input power supply equates, and the voltage on this moment M4 is zero.The magnetic flux that this state will be maintained to inductance L 1 and transformer T1 always resets fully, and promptly electric current will change till the direction, and at this moment, control circuit 5 sends signal and makes the M4 conducting, thereby realizes that no-voltage is open-minded.Because though C4 and D4 are connected in parallel on the M4, but because of D4 is partially anti-, making has electric charge to discharge from M4 on the C4, in fact, when L1, T1 charged to C1, the electric charge on the C4 also discharged to L1, T1, when C1 charges to input voltage by D8, the last electric charge of C4 is also just put substantially and is over, and also is that C4 produces resonance with C1 and inductance L 1 and transformer T1.In like manner, by the symmetry structure of circuit as can be known, when M4, M2, M3 suddenly by the time, also above-mentioned situation can appear, drive M1, M3, M2 respectively and realize that no-voltage is open-minded when resonance and device for power switching both end voltage are zero when capacitor and inductor produces.

Claims

1, a kind of two-way forward type supply convertor, comprise power switch device (1), device for transformer (3), current rectifying and wave filtering circuit (4) and control circuit (5), the input end of the output of device for transformer (3) and current rectifying and wave filtering circuit (4) is joined, control circuit (5) matches with power switch device (1) and current rectifying and wave filtering circuit (4) respectively, it is characterized in that being provided with resonant circuit (2) between power switch device (1) and the device for transformer (3).

2, two-way forward type supply convertor according to claim 1, it is characterized in that described resonant circuit (2) is by diode D1～D12, capacitor C 1～C4 and inductance L 1, L2 forms, C1, the elementary winding upper end of the series arm that D1 and L1 constitute and positive source and transformer T1 joins, C3, the elementary winding upper end of the series arm that D3 and L2 constitute and positive source and transformer T2 joins, at transformer T 1, between the lower end of the elementary winding of T2 and the power cathode respectively with the D2 that connects, C2 branch road and D4, the C4 branch road joins, in inductance L 1, be connected to diode D9 between the upper end of L2 and the power cathode respectively, D11, at transformer T1, be connected to diode D10 respectively between the elementary winding lower end of T2 and the positive source, D12, diode D5, the two ends of D8 are connected on diode D1 respectively, the anode of D4 and negative electrode; The two ends of diode D7, D6 are connected on anode and the negative electrode of diode D2, D3 respectively.