CN201118467Y

CN201118467Y - Bridge reversion device

Info

Publication number: CN201118467Y
Application number: CNU2007200408800U
Authority: CN
Inventors: 余晓东
Original assignee: ANHUI CHANGYUAN GREEN ENERGY Co Ltd
Current assignee: ANHUI CHANGYUAN GREEN ENERGY Co Ltd
Priority date: 2007-07-24
Filing date: 2007-07-24
Publication date: 2008-09-17
Anticipated expiration: 2017-07-24

Abstract

The utility model relates to an inverter device in a power supply, in particular to a bridge inverter device, comprising two switch tubes, two capacitors, two inductors and two diodes; one end of a load is connected with the anode and the cathode of the power supply respectively through the capacitors, while the other end is connected with the anode of the power supply respectively through one switch tube and the inductor serially connected with the switch tube and is connected with the cathode of the power supply through the other switch tube and the inductor serially connected with the switch tube; one diode is connected between the node between one switch tube and one inductor and the cathode of the power supply, while the other diode is connected between the node between the other switch tube and the other inductor and the anode of the power supply. The bridge inverter device of the utility model solves technical problem of switch tube short-circuit in the prior art and has the advantages of strong anti-short-circuit capability and good heat dissipation performance.

Description

The bridge type inverse device

Affiliated technical field

The utility model relates to the bridge type inverse device of DC/AC conversion in a kind of power-supply system.

Background technology

In current HID electric ballast and various inverter, all can comprise the DC/AC converting means, usually with half-bridge or full-bridge as solution.But in existing half-bridge or full-bridge circuit, if the switching tube on brachium pontis is open-minded simultaneously, the phenomenon that will be short-circuited-lead directly to, this is fatal for whole system, also is unacceptable.In the face of this problem the time, address from control mostly, as insertion Dead Time, three level controls etc., yet in strong interference environment, still might lead directly to, can't fundamentally solve the straight-through problem of switching tube.

The utility model content

Technology technical problem to be solved in the utility model provides a kind of bridge type inverse device that overcomes straight-through problem.

The technical scheme that the utility model adopted is: the bridge type inverse device comprises switching tube VT11, VT12, capacitor C 13, C14, inductance L 11, L12, diode D11, D12, load 1 (LOAD) end is respectively by capacitor C 13, C14 connects power positive cathode, the other end is connected positive source by the inductance L 11 of switching tube VT11 and series connection with it respectively, inductance L 12 by switching tube VT12 and series connection with it is connected power cathode, between the node between switching tube VT11 and the inductance L 11 and power cathode, be connected diode D11, between the node between switching tube VT12 and the inductance L 12 and positive source, be connected diode D12.

The advantage that the utility model had is:

(1) anti-straight-through ability is strong

The inductance of connecting on brachium pontis can resist the surge current of moment, and therefore when bridge arm direct pass, short circuit current can be suppressed in the scope of a safety, improves security of system.

(2) perfect heat-dissipating

Heater element mainly contains power semiconductor, electric capacity and magnetic core element in the system.For power semiconductor, its encapsulation generally all comprises a plane, can be close to spreader surface heat is conducted.And the common caloric value of electric capacity is little, unique more insoluble be exactly the magnetic core part heating problem.Because the shape of general magnetic device is not an ad hoc rules, can't conduct heat by radiator, main solution is to increase the magnetic core size or irritate heat-conducting glue.And in the present invention, the inductance half period of only working, it is general that loss and heating all reduce, thereby alleviated the heat radiation pressure of whole system.

Description of drawings

Fig. 1 is the utility model circuit theory diagrams

Fig. 2 is an embodiment list inductance half-bridge arrangement schematic diagram

Fig. 3 is an embodiment full-bridge schematic diagram of device

Fig. 4 is the utility model circuit working oscillogram

Embodiment

The utility model will be further described below in conjunction with accompanying drawing.

Embodiment:

Fig. 1 is the half-bridge circuit of the two inductance of band.As shown in Figure 1, this device comprises switching tube VT11, VT12, capacitor C 13, C14, inductance L 11, L12, diode D11, D12, load 1 (LOAD) end is respectively by capacitor C 13, C14 connects power positive cathode, the other end is connected positive source by the inductance L 11 of switching tube VT11 and series connection with it respectively, inductance L 12 by switching tube VT12 and series connection with it is connected power cathode, between the node between switching tube VT11 and the inductance L 11 and power cathode, be connected diode D11, between the node between switching tube VT12 and the inductance L 12 and positive source, be connected diode D12.

As seen, two inductance of having connected on the brachium pontis make that two switching tubes are open-minded simultaneously if occur disturbing, and then because inductive current can not suddenly change, the short circuit current on the brachium pontis can linearly rise, and does not also arrive usually before the dangerous values, and straight-through situation finishes.

To describe its operation principle in detail below:

When VT11 conducting, VT12 are turn-offed, capacitor C 13 discharges, the electric current loop that C13, VT11, L11, load 1 (LOAD) constitute of flowing through, the right positive left side of output is negative; When VT11 and VT12 turn-offed, because the L11 energy stored needs to discharge, the still right positive left side of the loop afterflow that inductive current constitutes by L11, load 1 (LOAD), C14, D11, output was negative.

When VT11 turn-offs, during the VT12 conducting, capacitor C 14 discharges, the electric current loop that C14, L12, VT12, load 1 (LOAD) constitute of flowing through, the right negative left side of output is just; When VT11 and VT12 turn-offed, because the L12 energy stored needs to discharge, the loop afterflow that inductive current constitutes by L12, D12, C13, LOAD, output were just still being kept a right negative left side.

C11, C12 and C15 are high-frequency filter capacitor.

The oscillogram of each element when Fig. 4 is its work.

Above-mentioned a kind of specific design is not limited in realization of the present utility model, and multiple embodiment can be arranged.

Fig. 2 is another embodiment list inductance semi-bridge inversion manipulated or operated apparatus.Two diodes of series connection prevent the switching tube reverse biased on the brachium pontis of this circuit.C21, C22, C23, C24 and C25 are high-frequency filter capacitor.

Fig. 3 is the two inductance full-bridge inverting device circuit figure of another embodiment.Because the existence of series inductance has effectively suppressed the short circuit current of straight-through moment on the brachium pontis.

Its operation principle is as follows:

When Q31, Q34 conducting, capacitor C 31 discharge, inductance L 32 energy storage, the electric current loop that C31, Q31, load 1 (LOAD), L32 and Q34 constitute of flowing through, an output left side is positive right negative; When Q31, Q34 turn-offed simultaneously, L32 released energy, and C31 charging, the loop afterflow that inductive current constitutes through L32, D32, C31, D33 and LOAD, output still are that a left side is positive right negative.

When Q32, Q33 conducting, capacitor C 31 discharge, inductance L 31 energy storage, the electric current loop that C31, Q32, load 1 (LOAD), L31 and Q33 constitute of flowing through, the negative right side, an output left side is just; When Q32, Q33 turn-offed simultaneously, L31 released energy, and C31 charges, and the loop afterflow that inductive current constitutes through L31, D31, C31, D34 and load 1 (LOAD), output still are that the right side is just being born in a left side.

C32 is a high-frequency filter capacitor.

Claims

1. bridge type inverse device, comprise switching tube (VT11), (VT12), electric capacity (C13), (C14), inductance (L11), (L12), diode (D11), (D12), it is characterized in that: load (1) one end is respectively by electric capacity (C13), (C14) connect power positive cathode, the other end is connected positive source by the inductance (L11) of switching tube (VT11) and series connection with it respectively, inductance (L12) by switching tube (VT12) and series connection with it is connected power cathode, between the node between switching tube (VT11) and the inductance (L11) and power cathode, be connected diode (D11), between the node between switching tube (VT12) and the inductance (L12) and positive source, be connected diode (D12).