CN203339946U

CN203339946U - LCD absorption circuit

Info

Publication number: CN203339946U
Application number: CN2013203319876U
Authority: CN
Inventors: 喻建军; 许行巍; 黄永耀; 曾安宁
Original assignee: WUHAN NENTRON TECHNOLOGIES Co Ltd
Current assignee: WUHAN NENTRON TECHNOLOGIES Co Ltd
Priority date: 2013-06-08
Filing date: 2013-06-08
Publication date: 2013-12-11
Anticipated expiration: 2023-06-08

Abstract

The utility model discloses a LCD absorption circuit comprising an AC signal source, a transformer, a rectifier circuit, a LCD circuit and a LC filter circuit connected in sequence; the LCD circuit comprises a first capacitor, a first inductor and a first diode connected in series in sequence; the LC filter circuit comprises a second capacitor and a second inductor connected in series; the second capacitor is connected in parallel with a load; a second diode is connected between the negative electrode of the first diode and the load; the first inductor is connected in parallel with a release circuit; the release circuit comprises a parallel circuit formed by a resistor and a third diode and a third capacitor connected in series with the parallel circuit. The added release circuit can fully release residual energy on the inductor, so turn off stress on the diode is reduced; circuit loss is reduced, and inductance is hardly saturated.

Description

A kind of LCD absorbing circuit

Technical field

The utility model relates to the absorbing circuit in the inverter field, more particularly, relates to a kind of LCD absorbing circuit.

Background technology

While in the inverter field, using the DC-DC circuit, generally can in the DC-DC circuit, add absorbing circuit, good absorbing effect and the efficiency of LCD absorbing circuit are high, but in traditional LCD absorbing circuit, while being operated in open loop situations, in minimum Dead Time, the energy on inductance can't discharge fully, causes that the shutoff stress on diode is higher, the loss of circuit is larger, simultaneously, inductance is prone to saturated phenomenon, ineffective to the LCD absorbing circuit.

The utility model content

The purpose of this utility model is the problem of mentioning in the above-mentioned background technology in order to solve, a kind of LCD absorbing circuit is provided, this absorbing circuit increases by a release circuit, by this release circuit, remaining energy on inductance is discharged fully, make the shutoff stress on diode reduce, circuit loss reduces, and inductance also is difficult for saturated.

To achieve these goals, the technical solution of the utility model is as follows:

A kind of LCD absorbing circuit, comprise the AC signal source, transformer and the rectification circuit that connect successively, also comprise the LCD circuit and the LC filter circuit that connect successively, described LCD circuit comprises the first electric capacity, the first inductance and the first diode be connected in series successively; Described LC filter circuit comprises the second electric capacity and the second inductance be connected in series, and described the second Capacitance parallel connection connects a load, between described the first diode cathode and described load, is connected with the second diode, and described the first inductance in parallel connects a release circuit; Described release circuit comprises the parallel circuits be comprised of resistance and the 3rd diode and the 3rd electric capacity be connected in series with described parallel circuits, described the 3rd electric capacity connects respectively described the first diode cathode and described the 3rd diode cathode, the direction of described the first diode, the second diode and the opposite direction of described the 3rd diode.

Further, described rectification circuit is connected to form by bridge-type by four rectifier diodes.

Compared with prior art, the beneficial effects of the utility model are as follows: the utility model is by the release circuit that is connected in parallel on inductance, close and have no progeny in diode reverse, on inductance, remaining energy discharges by this release circuit, energy can be discharged fully, thereby the shutoff stress on diode is reduced, and the loss of circuit reduces, and inductance also is difficult for saturated.

The accompanying drawing explanation

In order to be illustrated more clearly in the technical scheme of the utility model embodiment, in below describing embodiment, the accompanying drawing of required use is briefly described, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is structural framing schematic diagram of the present utility model;

Fig. 2 is electrical block diagram of the present utility model;

Reference numeral: 1-AC signal source, 2-transformer, 3-rectification circuit, 4-LCD circuit, 5-LC filter circuit, 6-load, 7-release circuit.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Embodiment based in the utility model, those of ordinary skills are not making under the creative work prerequisite the every other embodiment obtained, and all belong to the scope of the utility model protection.

Be illustrated in figure 1 structural framing schematic diagram of the present utility model, a kind of LCD absorbing circuit, comprise the AC signal source 1 connected successively, transformer 2, rectification circuit 3, LCD circuit 4 and LC filter circuit 5, LCD circuit 4 comprises the first capacitor C 1 be connected in series, the first inductance L 1 and the first diode D1, LC filter circuit 5 comprises the second capacitor C 2 and the second inductance L 2 be connected in series, the second capacitor C 2 resistance R 2 that is connected in parallel, resistance R 2 is load 6, be connected with the second diode D2 between the first diode D1 negative pole and load 6, the first inductance L 1 release circuit 7 that is connected in parallel, release circuit 7 comprises the parallel circuits be comprised of resistance R 1 and the 3rd diode D3 and the 3rd capacitor C 3 be connected in series with this parallel circuits, the 3rd capacitor C 3 connects respectively the first diode D1 positive pole and the 3rd diode D3 positive pole, the first diode D1, the opposite direction of the direction of the second diode D2 and the 3rd diode D3, rectification circuit 3 is connected to form by bridge-type by four rectifier diodes.

Be illustrated in figure 2 electrical block diagram of the present utility model, at the metal-oxide-semiconductor shutdown moment, energy in transformer 2 leakage inductances, after the resonant circuit formed by the first capacitor C 1 in LCD circuit 4 and the first inductance L 1, energy is deposited in the first capacitor C 1 and the first inductance L 1, after the transitional period completes, energy in the first capacitor C 1 and the first inductance L 1 is by the first diode D1, the second diode D2 flows to load 6, thereby realize the Lossless Snubber of energy, energy on the first inductance L 1 is discharged into certain the time, force the first diode D1 oppositely to close and have no progeny, on the first inductance, the remaining energy of L1 discharges the negative voltage on the first inductance L 1 by the resistance in release circuit 7, positive voltage on the 3rd diode D3 clamper the first inductance L 1 in while release circuit 7, make it in minimum Dead Time, as early as possible the energy on the first inductance L 1 is discharged fully, thereby make the shutoff stress on the first diode D1 reduce, the loss of circuit reduces, inductance also is difficult for saturated.

The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any modification of doing, be equal to replacement etc., within all should being included in protection range of the present utility model.

Claims

1. a LCD absorbing circuit, comprise the AC signal source, transformer and the rectification circuit that connect successively, it is characterized in that, also comprise the LCD circuit and the LC filter circuit that connect successively, described LCD circuit comprises the first electric capacity, the first inductance and the first diode be connected in series successively; Described LC filter circuit comprises the second electric capacity and the second inductance be connected in series, and described the second Capacitance parallel connection connects a load, between described the first diode cathode and described load, is connected with the second diode, and described the first inductance in parallel connects a release circuit; Described release circuit comprises the parallel circuits be comprised of resistance and the 3rd diode and the 3rd electric capacity be connected in series with described parallel circuits, described the 3rd electric capacity connects respectively described the first diode cathode and described the 3rd diode cathode, the direction of described the first diode, the second diode and the opposite direction of described the 3rd diode.

2. a kind of LCD absorbing circuit according to claim 1, is characterized in that, described rectification circuit is connected to form by bridge-type by four rectifier diodes.