CN212875654U

CN212875654U - Medium and small power communication power supply system adopting quasi-resonance soft switch

Info

Publication number: CN212875654U
Application number: CN202020561430.1U
Authority: CN
Inventors: 叶斌; 严波
Original assignee: Shenzhen Xinxinxinting Communication Equipment Co ltd
Current assignee: Shenzhen Xinxinxinting Communication Equipment Co ltd
Priority date: 2020-04-16
Filing date: 2020-04-16
Publication date: 2021-04-02
Anticipated expiration: 2030-04-16

Abstract

The utility model discloses an adopt soft switch's of quasi-resonance medium and small power communication electrical power generating system, switch tube work waveform detection circuitry includes third and triode and third triode, the one end of thirteenth resistance and fourteenth resistance is connected respectively to the first pin of quasi-resonance control chip, the collecting electrode of first triode is connected to the second pin of quasi-resonance control chip and through second electric capacity and opto-coupler ground connection respectively, the third pin of quasi-resonance control chip connects the fourth pin of quasi-resonance control chip through eighth electric capacity, the base of second triode and third triode is connected through twenty-fifth resistance to the fifth pin of quasi-resonance control chip. The utility model discloses beneficial effect: the utility model discloses quasi-resonance control chip adopts NCP1380 control chip, through the work waveform that detects primary switch tube, and control switch tube switches on at the bottom of the valley, and switch tube switches on the beginning moment, and operating current is zero to reduce switching loss, promote module stability; and the efficiency of the power supply module is improved.

Description

Medium and small power communication power supply system adopting quasi-resonance soft switch

Technical Field

The utility model belongs to the technical field of the electronic information technique and specifically relates to an adopt middle and small power communication electrical power generating system of quasi-resonance soft switch.

Background

With the increase in frequency of power electronic devices, miniaturization and high power density of power electronic devices have become possible. However, if the switching mode is not changed, simply increasing the switching frequency will increase the switching loss of the device, decrease the efficiency, generate heat seriously, increase the electromagnetic interference and cause the problem of electromagnetic compatibility.

Therefore, there is a need for a medium and small power communication power supply system using quasi-resonant soft switching.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the not enough among the prior art, providing an adopt middle and small power communication electrical power generating system of quasi-resonance soft switch, solved the problem that prior art exists.

In order to solve the technical problem, the utility model discloses a realize through following technical scheme:

the utility model provides an adopt soft switch's of quasi-resonance medium and small power communication electrical power generating system, includes quasi-resonance control chip and switch tube work waveform detection circuitry, switch tube work waveform detection circuitry includes triode and third triode, the one end of thirteenth resistance and fourteenth resistance is connected respectively to quasi-resonance control chip's first pin, quasi-resonance control chip's second pin is connected the collecting electrode of first triode and is grounded through second electric capacity and opto-coupler respectively, quasi-resonance control chip's third pin is through eighth electric capacity connection quasi-resonance control chip's fourth pin, quasi-resonance control chip's fifth pin is through the base of twenty-fifth resistance connection second triode and third triode, quasi-resonance control chip's sixth pin is through twelfth electric capacity and thirteenth electric capacity ground connection respectively, quasi-resonance control chip's seventh pin loops through first inverter diode, The twenty-fourth resistor, the twenty-second resistor and the twentieth resistor are connected with the power supply, the seventh pin of the quasi-resonance control chip is grounded through a twenty-third resistor and a fifth capacitor, and the eighth pin of the quasi-resonance control chip is grounded through a sixth capacitor.

Preferably, a first pin of the quasi-resonance control chip is grounded through a first capacitor and a first diode, and an anode of the first diode is connected with a sixth pin of the quasi-resonance control chip through a twelfth resistor, a nineteenth resistor, a seventh diode and a twenty-first resistor in sequence.

Preferably, a second resistor and a third capacitor are connected between the base and the collector of the first triode.

Preferably, the collector of the second triode is grounded through a thirty-first resistor and a fifteenth capacitor in sequence, and the collectors of the second triode and the third triode are both connected with the gate of the fourth MOS transistor through a thirty-second resistor.

Preferably, a second inverter diode and a thirty-third resistor are connected between the gate and the source of the fourth MOS transistor, and the source of the fourth MOS transistor is grounded through a thirty-fifth resistor and is connected to the third pin of the quasi-resonance control chip through a thirty-fourth resistor, respectively.

Preferably, the drain of the fourth MOS transistor is connected to a ninth diode and a transformer, and the ninth diode is connected to the transformer through the first inverter diode, the fourteenth capacitor and the twenty-eighth resistor, respectively.

Preferably, the quasi-resonance control chip adopts an NCP1380 control chip.

The utility model discloses beneficial effect: the utility model discloses quasi-resonance control chip adopts NCP1380 control chip, through the work waveform that detects primary switch tube, and control switch tube switches on at the bottom of the valley, and switch tube switches on the beginning moment, and operating current is zero to reduce switching loss, promote module stability; and the efficiency of the power supply module is improved.

The conception, the specific structure and the technical effects of the present invention will be further described with reference to the accompanying drawings, so as to fully understand the objects, the features and the effects of the present invention.

Drawings

Fig. 1 is a schematic diagram of a medium and low power communication power supply system adopting a quasi-resonance soft switch.

Detailed Description

The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.

As shown in fig. 1, a medium and small power communication power supply system using a quasi-resonance soft switch includes a quasi-resonance control chip and a switching tube operating waveform detection circuit, the switching tube operating waveform detection circuit includes a second transistor Q2 and a third transistor Q3, a first pin of the quasi-resonance control chip U1 is respectively connected to one end of a thirteenth resistor R13 and one end of a fourteenth resistor R14, a second pin of the quasi-resonance control chip U1 is connected to a collector of a first transistor Q1 and is respectively grounded through a second capacitor C2 and an opto-coupler OT1, a third pin of the quasi-resonance control chip U1 is connected to a fourth pin of a quasi-resonance control chip U1 through an eighth capacitor C8, a fifth pin of the quasi-resonance control chip U1 is connected to bases of a second transistor Q2 and a third transistor Q3 through a twenty-fifth resistor R25, a sixth pin of the quasi-resonance control chip U1 is respectively grounded through a twelfth capacitor C12 and a thirteenth capacitor C13, a seventh pin of the quasi-resonance control chip U1 is connected to a power supply sequentially through a first inverter diode ZD1, a twenty-fourth resistor R24, a twenty-second resistor R22 and a twentieth resistor R20, a seventh pin of the quasi-resonance control chip U1 is also grounded through a thirteenth resistor R23 and a fifth capacitor C5, and an eighth pin of the quasi-resonance control chip U1 is grounded through a sixth capacitor C6.

Further, a first pin of the quasi-resonance control chip U1 is grounded through a first capacitor C1 and a first diode D1, and an anode of the first diode D1 is connected to a sixth pin of the quasi-resonance control chip U1 through a twelfth resistor R12, a nineteenth resistor R19, a seventh diode D7, and a twenty-first resistor R21 in sequence.

Further, a second resistor R2 and a third capacitor C3 are connected between the base and the collector of the first triode Q1.

Furthermore, the collector of the second triode Q2 is grounded through a thirty-first resistor R31 and a fifteenth capacitor C15 in sequence, and the collectors of the second triode Q2 and the third triode Q3 are both connected to the gate of the fourth MOS transistor Q4 through a twelfth resistor R32.

Further, a second inverter diode ZD2 and a thirty-third resistor R33 are connected between the gate and the source of the fourth MOS transistor Q4, and the source of the fourth MOS transistor Q4 is grounded through a thirty-fifth resistor R35 and is connected to the third pin of the quasi-resonance control chip U1 through a thirty-fourth resistor R34, respectively.

Further, a drain of the fourth MOS transistor Q4 is connected to a ninth diode D9 and a transformer T, and the ninth diode D9 is connected to the transformer T through a first inverter diode ZD1, a fourteenth capacitor C14 and a twenty-eighth resistor R28, respectively.

Further, the quasi-resonance control chip U1 adopts an NCP1380 control chip.

The resonance soft switching technology changes the switching mode of the device, so that the switching loss can be reduced to zero in principle, and the switching frequency can be increased without limitation, thereby being an effective method for reducing the switching loss of the device and increasing the switching frequency.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims

1. A medium and small power communication power supply system adopting a quasi-resonance soft switch is characterized in that: the circuit comprises a quasi-resonance control chip and a switching tube working waveform detection circuit, wherein the switching tube working waveform detection circuit comprises a second triode (Q2) and a third triode (Q3), a first pin of the quasi-resonance control chip (U1) is respectively connected with one end of a thirteenth resistor (R13) and one end of a fourteenth resistor (R14), a second pin of the quasi-resonance control chip (U1) is connected with a collector of a first third triode (Q1) and is respectively grounded through a second capacitor (C2) and an optocoupler (OT 1), a third pin of the quasi-resonance control chip (U1) is connected with a fourth pin of the quasi-resonance control chip (U1) through an eighth capacitor (C8), a fifth pin of the quasi-resonance control chip (U1) is connected with bases of a second triode (Q2) and a third triode (Q3) through a twenty-fifth resistor (R58 2 9), a sixth pin of the quasi-resonance control chip (U1) is respectively grounded through a twelfth capacitor (C12) and a twelfth capacitor (C13), the seventh pin of the quasi-resonance control chip (U1) is connected with a power supply sequentially through a first inverter diode (ZD 1), a twenty-fourth resistor (R24), a twenty-second resistor (R22) and a twentieth resistor (R20), the seventh pin of the quasi-resonance control chip (U1) is grounded through a thirteenth resistor (R23) and a fifth capacitor (C5), and the eighth pin of the quasi-resonance control chip (U1) is grounded through a sixth capacitor (C6).

2. A medium and small power communication power supply system using quasi-resonant soft switches, as claimed in claim 1, wherein: the first pin of the quasi-resonance control chip (U1) is grounded through a first capacitor (C1) and a first diode (D1), and the anode of the first diode (D1) is connected with the sixth pin of the quasi-resonance control chip (U1) through a twelfth resistor (R12), a nineteenth resistor (R19), a seventh diode (D7) and a twenty-first resistor (R21) in sequence.

3. A medium and small power communication power supply system using quasi-resonant soft switches, as claimed in claim 1, wherein: the collector of the second triode (Q2) is grounded through a thirty-first resistor (R31) and a fifteenth capacitor (C15) in sequence, and the collectors of the second triode (Q2) and the third triode (Q3) are connected with the grid of a fourth MOS (Q4) through a thirty-second resistor (R32).

4. A medium and small power communication power supply system using quasi-resonant soft switches, as claimed in claim 3, wherein: a second inverter diode (ZD 2) and a thirty-third resistor (R33) are connected between the grid and the source of the fourth MOS transistor (Q4), and the source of the fourth MOS transistor (Q4) is grounded through a thirty-fifth resistor (R35) and is connected with a third pin of a quasi-resonance control chip (U1) through a thirty-fourth resistor (R34) respectively.

5. A medium and small power communication power supply system using quasi-resonant soft switches, as claimed in claim 3, wherein: the drain electrode of the fourth MOS transistor (Q4) is connected with a ninth diode (D9) and a transformer (T), and the ninth diode (D9) is connected with the transformer (T) through a first inverter diode (ZD 1), a fourteenth capacitor (C14) and a twenty-eighth resistor (R28).

6. A medium and small power communication power supply system using quasi-resonant soft switches, as claimed in claim 1, wherein: the quasi-resonance control chip (U1) adopts an NCP1380 control chip.