CN206559236U - A kind of new half-bridge switch power source circuit - Google Patents

Abstract

The utility model discloses a kind of new half-bridge switch power source circuit, including the AC rectification circuit being connected with ac input end（D1, D2, D3, D4）The AC rectification lines in parallel has the first filter capacitor C1, the positive pole of the first filter capacitor C1 is connected with the first blocking derided capacitors C2 first end and first switch pipe Q1 colelctor electrode, and the negative pole of the first filter capacitor C1 is connected with the second blocking derided capacitors C3 the second end and second switch pipe Q2 emitter stage；The base stage of first switch pipe Q1 and second switch the pipe Q2 is respectively connected with the input of PWM drive circuit, the emitter stage of the first switch pipe Q1 is connected with second switch pipe Q2 colelctor electrode and switch transformer T1 first input end, the second end of the first blocking derided capacitors C2 is connected with the second blocking derided capacitors C3 first end and switch transformer T1 the second input, and the output end of the switch transformer T1 is connected with rectifying and wave-filtering circuit.

Description

A kind of new half-bridge switch power source circuit

Technical field

The utility model is related to power technique fields, it particularly relates to a kind of new half-bridge switch power source circuit.

Background technology

The developing direction of Switching Power Supply is high frequency, highly reliable, low noise, anti-interference and modularization.Switching Power Supply is light, small, Thin key technology difficulty is exactly high frequency, therefore the external component for being devoted to the new high-intelligentization of synchronous development.Existing In some Switching Power Supply circuits, as shown in figure 1, the equilibrium partial pressure resistance that must be used using double filter capacitor circuits, it is easy because Capacity tolerance causes partial pressure imbalance of being connected on 2 electric capacity（It is higher that capacity shares more greatly voltage）, easily trigger electric capacity blast, ten Divide danger.

The problem of in correlation technique, effective solution is not yet proposed at present.

Utility model content

For the above-mentioned technical problem in correlation technique, the utility model proposes a kind of new half-bridge switch power source circuit, It can solve the problem that above-mentioned technical problem.

To realize above-mentioned technical purpose, what the technical solution of the utility model was realized in：

A kind of new half-bridge switch power source circuit, including the AC rectification circuit being connected with ac input end, the friendship The positive pole that stream electric rectification lines in parallel has the first filter capacitor C1, the first filter capacitor C1 is connected with the first blocking partial pressure electricity Hold C2 first end and first switch pipe Q1 colelctor electrode, the negative pole of the first filter capacitor C1 is connected with the second blocking point Voltage capacitance C3 the second end and second switch pipe Q2 emitter stage；The base stage of first switch pipe Q1 and second switch the pipe Q2 The input of PWM drive circuit is respectively connected with, the emitter stage of the first switch pipe Q1 is connected with second switch pipe Q2 current collection Pole and switch transformer T1 first input end, the second end of the first blocking derided capacitors C2 are connected with the second blocking point Voltage capacitance C3 first end and switch transformer T1 the second input, the output end of the switch transformer T1 are connected with whole Flow filter circuit.

Further, the AC rectification circuit includes the first commutation diode D1, the second commutation diode D2, the 3rd Commutation diode D3 and the 4th commutation diode D4；The positive pole and the second commutation diode D2 of the first commutation diode D1 Negative pole be connected with the ac input end, the negative pole of the 3rd commutation diode D3 and the 4th commutation diode D4 positive pole It is connected with the ac input end；The negative pole of the first commutation diode D1 and the 4th commutation diode D4 and the described first filter The colelctor electrode of ripple electric capacity C1 positive pole, the first blocking derided capacitors C2 first end and first switch pipe Q1 is connected, and described the Two commutation diode D2 and the 3rd commutation diode D3 positive pole and the first filter capacitor C1 negative pole, the second blocking partial pressure Electric capacity C3 the second end and second switch pipe Q2 emitter stage are connected.

Further, the current rectifying and wave filtering circuit includes the 5th commutation diode D5 and the 6th commutation diode D6, described 5th commutation diode D5 positive pole is connected with the first output end of the switch transformer T1, the poles D 6 of the 6th rectification two Positive pole be connected with the second output end of the switch transformer, the 5th commutation diode D5 and the 6th commutation diode D6 Negative pole be connected with energy-storage travelling wave tube L1 first end, the second end of the energy-storage travelling wave tube L1 is being connected with the second filter capacitor C4 just Pole and the 3rd filter capacitor C5 positive pole, negative pole and the switch of the second filter capacitor C4 and the 3rd filter capacitor C5 The output end tap of transformer is connected.

Further, the just extremely output cathode, described second of the second filter capacitor C4 and the 3rd filter capacitor C5 Filter capacitor C4 and the 3rd filter capacitor C5 negative pole are output negative pole.

The beneficial effects of the utility model：

（1）Using single filter capacitor after rectification, available circuit is eliminated using must be used in double filter capacitor circuits Equilibrium partial pressure resistance, eliminate the loss of equilibrium partial pressure resistance, raising efficiency；

（2）Using single filter capacitor after rectification, available circuit is eliminated using double filter capacitors, is solved because capacity is inclined Partial pressure of being connected on 2 electric capacity caused by difference is uneven（It is higher that capacity shares more greatly voltage）, prevented because 2 filter capacitors hold The electric capacity explosion danger that partial pressure caused by measuring deviation is uneven and triggers.

Brief description of the drawings

, below will be to embodiment in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art In required for the accompanying drawing that uses be briefly described, it should be apparent that, drawings in the following description are only of the present utility model Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this A little accompanying drawings obtain other accompanying drawings.

Fig. 1 is the structural representation of the existing half-bridge switch power source circuit according to the utility model embodiment；

Fig. 2 is the structural representation of the new half-bridge switch power source circuit according to the utility model embodiment.

Embodiment

Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the utility model, rather than whole Embodiment.Based on the embodiment in the utility model, the every other embodiment that those of ordinary skill in the art are obtained all belongs to The scope protected in the utility model.

As shown in Fig. 2 a kind of new half-bridge switch power source circuit according to the utility model embodiment, including with friendship Flow the connected AC rectification circuit of input, the AC rectification lines in parallel has the first filter capacitor C1, described first Filter capacitor C1 positive pole is connected with the first blocking derided capacitors C2 first end and first switch pipe Q1 colelctor electrode, described First filter capacitor C1 negative pole is connected with the second blocking derided capacitors C3 the second end and second switch pipe Q2 emitter stage； The base stage of first switch pipe Q1 and second switch the pipe Q2 is respectively connected with the input of PWM drive circuit, the first switch Pipe Q1 emitter stage is connected with second switch pipe Q2 colelctor electrode and switch transformer T1 first input end, described first every Straight derided capacitors C2 the second end be connected with the second blocking derided capacitors C3 first end and switch transformer T1 it is second defeated Enter end, the output end of the switch transformer T1 is connected with rectifying and wave-filtering circuit.

In a specific embodiment of the present utility model, the AC rectification circuit includes the first commutation diode D1, the second commutation diode D2, the 3rd commutation diode D3 and the 4th commutation diode D4；The first commutation diode D1 Positive pole and the second commutation diode D2 negative pole be connected with the ac input end, the negative pole of the 3rd commutation diode D3 It is connected with the 4th commutation diode D4 positive pole with the ac input end；The first commutation diode D1 and the 4th rectification two Pole pipe D4 negative pole and the first filter capacitor C1 positive pole, the first blocking derided capacitors C2 first end and first switch Pipe Q1 colelctor electrode is connected, positive pole and first filtered electrical of the second commutation diode D2 and the 3rd commutation diode D3 The emitter stage for holding C1 negative pole, the second blocking derided capacitors C3 the second end and second switch pipe Q2 is connected.

In a specific embodiment of the present utility model, the current rectifying and wave filtering circuit include the 5th commutation diode D5 and 6th commutation diode D6, the positive pole of the 5th commutation diode D5 and the first output end phase of the switch transformer T1 Even, the positive pole of the poles D 6 of the 6th rectification two is connected with the second output end of the switch transformer, the 5th rectification two Pole pipe D5 and the 6th commutation diode D6 negative pole are connected with energy-storage travelling wave tube L1 first end, the second end of the energy-storage travelling wave tube L1 It is connected with the second filter capacitor C4 positive pole and the 3rd filter capacitor C5 positive pole, the filters of the second filter capacitor C4 and the 3rd Ripple electric capacity C5 negative pole is connected with the output end tap of the switch transformer.Wherein, the second filter capacitor C4 and the 3rd Filter capacitor C5 just extremely output cathode, the negative pole of the second filter capacitor C4 and the 3rd filter capacitor C5 is negative for output Pole.

In summary, by means of above-mentioned technical proposal of the present utility model, the utility model is after rectification using single filter Ripple electric capacity, eliminates available circuit using the equilibrium partial pressure resistance that must be used in double filter capacitor circuits, eliminates balance point The loss of piezoresistance, raising efficiency；Using single filter capacitor after rectification, available circuit is eliminated using double filter capacitors, Solve because partial pressure of being connected on 2 electric capacity caused by capacity tolerance is uneven（It is higher that capacity shares more greatly voltage）, prevent The electric capacity explosion danger that partial pressure caused by 2 filter capacitor capacity tolerances is uneven and triggers.

Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model Within the spirit and principle of utility model, any modification, equivalent substitution and improvements made etc. should be included in the utility model Protection domain within.

Claims (4)

1. a kind of new half-bridge switch power source circuit, it is characterised in that including the AC rectification line being connected with ac input end Road, the AC rectification lines in parallel has the first filter capacitor C1, and the positive pole of the first filter capacitor C1 is connected with first Blocking derided capacitors C2 first end and first switch pipe Q1 colelctor electrode, the negative pole of the first filter capacitor C1 are connected with Second blocking derided capacitors C3 the second end and second switch pipe Q2 emitter stage；The first switch pipe Q1 and second switch Pipe Q2 base stage is respectively connected with the input of PWM drive circuit, and the emitter stage of the first switch pipe Q1 is connected with second switch Pipe Q2 colelctor electrode and switch transformer T1 first input end, the second end of the first blocking derided capacitors C2 are connected with Second blocking derided capacitors C3 first end and switch transformer T1 the second input, the output of the switch transformer T1 End is connected with rectifying and wave-filtering circuit.

2. new half-bridge switch power source circuit according to claim 1, it is characterised in that the AC rectification circuit bag Include the first commutation diode D1, the second commutation diode D2, the 3rd commutation diode D3 and the 4th commutation diode D4；It is described First commutation diode D1 positive pole and the second commutation diode D2 negative pole are connected with the ac input end, and the described 3rd is whole Stream diode D3 negative pole and the 4th commutation diode D4 positive pole are connected with the ac input end；The pole of first rectification two The of pipe D1 and the 4th commutation diode D4 negative pole and the first filter capacitor C1 positive pole, the first blocking derided capacitors C2 One end and first switch pipe Q1 colelctor electrode are connected, the positive pole of the second commutation diode D2 and the 3rd commutation diode D3 The emitter stage of negative pole, the second blocking derided capacitors C3 the second end and second switch pipe Q2 with the first filter capacitor C1 It is connected.

3. new half-bridge switch power source circuit according to claim 1 or 2, it is characterised in that the current rectifying and wave filtering circuit Including the 5th commutation diode D5 and the 6th commutation diode D6, the positive pole of the 5th commutation diode D5 becomes with the switch Depressor T1 the first output end is connected, the positive pole of the poles D 6 of the 6th rectification two and the second output end of the switch transformer It is connected, the negative pole of the 5th commutation diode D5 and the 6th commutation diode D6 is connected with energy-storage travelling wave tube L1 first end, institute The second end for stating energy-storage travelling wave tube L1 is connected with the second filter capacitor C4 positive pole and the 3rd filter capacitor C5 positive pole, described Two filter capacitor C4 and the 3rd filter capacitor C5 negative pole are connected with the output end tap of the switch transformer.

4. new half-bridge switch power source circuit according to claim 3, it is characterised in that the second filter capacitor C4 and 3rd filter capacitor C5 just extremely output cathode, the negative pole of the second filter capacitor C4 and the 3rd filter capacitor C5 are output Negative pole.