CN210839329U

CN210839329U - Starting circuit capable of preventing secondary starting of power supply

Info

Publication number: CN210839329U
Application number: CN201922299684.0U
Authority: CN
Inventors: 崔马林; 王先才
Original assignee: Wuxi Ouruijie Electronic Technology Co ltd
Current assignee: Wuxi Ouruijie Electronic Technology Co ltd
Priority date: 2019-12-19
Filing date: 2019-12-19
Publication date: 2020-06-23
Anticipated expiration: 2029-12-19

Abstract

The utility model discloses a starting circuit for preventing secondary starting of a power supply, which belongs to the technical field of switching power supplies and comprises a live wire end L, a rectifier bridge DB1, an isolation diode D1, a filter capacitor, a starting resistor, a chip capacitor and a null wire end N; the rectifier bridge DB1 is provided with an a end, a b end, a c end and a d end; the fire wire end L is electrically connected with the end a of the rectifier bridge DB 1; the b end of the rectifier bridge DB1 is electrically connected with the input end of the isolation diode D1, and the output end of the isolation diode D1 is electrically connected with the input end of the filter capacitor; the end b of the rectifier bridge DB1 is also electrically connected with the input end of the starting resistor, and the output end of the filter capacitor is electrically connected with the input end of the starting resistor; the output end of the starting resistor is electrically connected with the input end of the chip capacitor, and the output end of the chip capacitor is electrically connected with the end d of the rectifier bridge DB 1; the end c of the rectifier bridge DB1 is electrically connected with the zero line end N, so that the problem that the power supply cannot be started for the second time is solved.

Description

Starting circuit capable of preventing secondary starting of power supply

Technical Field

The utility model relates to a switching power supply technical field, more specifically say, relate to a prevent starting circuit of power supply secondary start-up.

Background

The switching power supply is a power supply which utilizes modern power electronic technology to control the on-off time ratio of a switching tube and maintain stable output voltage, generally comprises a Pulse Width Modulation (PWM) control IC and a MOSFET, and is continuously innovated along with the development and innovation of the power electronic technology.

The traditional switching power supply, particularly the wide-voltage input power supply, has the advantages that because the input turn-off point of the switching power supply is higher, the input voltage still has enough voltage on the electrolysis surface after the power supply is turned off, the voltage on the input filter capacitor charges the starting capacitor through the starting resistor, and the power supply can be started for the second time under specific conditions.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved

To the problem that exists among the prior art, the utility model aims to provide a prevent starting circuit of power restart, it has realized that the power can not the problem of restart.

2. Technical scheme

In order to solve the above problem, the utility model adopts the following technical scheme:

a starting circuit capable of preventing secondary starting of a power supply comprises a live wire end L, a rectifier bridge DB1, an isolation diode D1, a filter capacitor, a starting resistor, a chip capacitor and a null wire end N;

the rectifier bridge DB1 is provided with an a end, a b end, a c end and a d end;

the fire wire end L is electrically connected with the end a of the rectifier bridge DB 1;

the b end of the rectifier bridge DB1 is electrically connected with the input end of an isolation diode D1, and the output end of the isolation diode D1 is electrically connected with the input end of a filter capacitor;

the end b of the rectifier bridge DB1 is also electrically connected with the input end of the starting resistor, and the output end of the filter capacitor is electrically connected with the input end of the starting resistor;

the output end of the starting resistor is electrically connected with the input end of the chip capacitor, and the output end of the chip capacitor is electrically connected with the end d of the rectifier bridge DB 1;

the end c of the rectifier bridge DB1 is electrically connected with the zero line end N, so that the problem that the power supply cannot be started for the second time is solved.

As a preferred scheme of the utility model, rectifier bridge DB1 comprises two second diodes D2 and two third diodes D3, two third diodes D3 series connection, two second diodes D2 series connection, and carry out parallel connection after establishing ties with two second diodes D2 after two third diodes D3 establish ties.

As a preferred scheme of the utility model, the filter capacitor is electrolytic capacitor.

As a preferred embodiment of the present invention, the starting resistor is composed of a resistor R1 and a resistor R2, and the resistor R1 and the resistor R2 are sequentially connected in series.

As a preferred scheme of the utility model, the chip capacitor is an electrolytic capacitor.

3. Advantageous effects

Compared with the prior art, the utility model has the advantages of:

according to the scheme, after alternating current is rectified, the alternating current is connected with the filter capacitor through the isolation diode D1, the starting resistor obtains electricity from the rectifier bridge DB1 and before the isolation diode D1, and the chip capacitor is charged.

Drawings

Fig. 1 is a schematic circuit diagram of the present invention.

Detailed Description

The technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiment of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention based on the embodiments of the present invention.

Example (b):

referring to fig. 1, a starting circuit for preventing secondary starting of a power supply includes a live wire end L, a rectifier bridge DB1, an isolation diode D1, a filter capacitor, a starting resistor, a chip capacitor and a zero line end N, wherein the rectifier bridge DB1 is composed of two second diodes D2 and two third diodes D3, the two third diodes D3 are connected in series, the two second diodes D2 are connected in series, and the two third diodes D3 are connected in series and then connected in parallel with the two second diodes D2;

the b end of the rectifier bridge DB1 is electrically connected with the input end of the isolation diode D1, and the output end of the isolation diode D1 is electrically connected with the input end of the filter capacitor;

the terminal c of the rectifier bridge DB1 is electrically connected to the neutral terminal N.

Preferably, the filter capacitor C1 is an electrolytic capacitor, the starting resistor is composed of a resistor R1 and a resistor R2, the resistor R1 and the resistor R2 are sequentially connected in series, and the chip capacitor C2 is an electrolytic capacitor.

Illustratively, the chip capacitor C2 is used as a power supply VCC after charging to supply power to other electronic components.

The working principle is as follows: after alternating current is rectified, the alternating current is connected with a filter capacitor through an isolation diode D1, a starting resistor obtains electricity from the rectifier bridge DB1 and before the isolation diode D1, the chip capacitor is charged, and therefore after the switching power supply is turned off, the residual electricity on the filter capacitor cannot charge the chip capacitor through the starting resistor due to the fact that the isolation diode D1 has one-way conductivity, and therefore the power supply cannot be started for the second time.

The above description is only the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can substitute or change the technical solution and the improvement concept of the present invention within the technical scope disclosed in the present invention.

Claims

1. A starting circuit for preventing secondary starting of a power supply is characterized in that: the power supply comprises a live wire end (L), a rectifier bridge (DB1), an isolation diode (D1), a filter capacitor (C1), a starting resistor, a chip capacitor (C2) and a zero line end (N);

the rectifier bridge (DB1) is provided with an a end, a b end, a c end and a d end;

the fire wire end (L) is electrically connected with the end a of the rectifier bridge (DB 1);

the b end of the rectifier bridge (DB1) is electrically connected with the input end of an isolation diode (D1), and the output end of the isolation diode (D1) is electrically connected with the input end of a filter capacitor;

the b end of the rectifier bridge (DB1) is also electrically connected with the input end of the starting resistor, and the output end of the filter capacitor is electrically connected with the input end of the starting resistor;

the output end of the starting resistor is electrically connected with the input end of the chip capacitor, and the output end of the chip capacitor is electrically connected with the end d of the rectifier bridge (DB 1);

and the end c of the rectifier bridge (DB1) is electrically connected with the zero line end (N).

2. The starting circuit for preventing the secondary starting of the power supply as claimed in claim 1, wherein: the rectifier bridge (DB1) is composed of two second diodes (D2) and two third diodes (D3), two the third diodes (D3) are connected in series, two the second diodes (D2) are connected in series, and two third diodes (D3) are connected in series and then are connected in parallel with the two second diodes (D2).

3. The starting circuit for preventing the secondary starting of the power supply as claimed in claim 1, wherein: the filter capacitor is an electrolytic capacitor.

4. The starting circuit for preventing the secondary starting of the power supply as claimed in claim 1, wherein: the starting resistor consists of a resistor R1 and a resistor R2, and the resistor R1 and the resistor R2 are sequentially connected in series.

5. The starting circuit for preventing the secondary starting of the power supply as claimed in claim 1, wherein: the chip capacitor is an electrolytic capacitor.