CN216086472U

CN216086472U - Anti-interference circuit of switching power supply

Info

Publication number: CN216086472U
Application number: CN202122107118.2U
Authority: CN
Inventors: 王能达; 吴广华; 谈超华; 王俊
Original assignee: Guangzhou Shangwei Electronics Co ltd
Current assignee: Guangzhou Shangwei Electronics Co ltd
Priority date: 2021-09-02
Filing date: 2021-09-02
Publication date: 2022-03-18
Anticipated expiration: 2031-09-02

Abstract

The utility model discloses an anti-interference circuit of a switching power supply, which comprises a switching power supply U1, an integrated circuit grounding end GND, a gate driving output end GD, a current detection input end CS, a power supply voltage VCC, a ferrite bead FB and an over-temperature protection OTP which are integrally installed on the switching power supply U1, wherein 6 leads are led out of the switching power supply U1 and are divided into No. 1, No. 2, No. 3, No. 4, No. 5 and No. 6, and the leads correspond to the integrated circuit grounding end GND, the ferrite bead FB, the over-temperature protection OTP, the current detection input end CS, the power supply voltage VCC and the gate driving output end GD one to one. The U1 that this switching power supply anti-jamming circuit set up is switching power supply IC, and diode D1 and chip capacitor EC1 constitute the IC power supply line for provide stable power supply, and cooperation resistance R1 and electric capacity C1 constitute RC low pass filter circuit, be used for the filtering come from the high frequency interference that big dynamic links such as transformer, switch tube produced, have avoided disturbing from the feed end invasion influence IC normal work.

Description

Anti-interference circuit of switching power supply

Technical Field

The utility model relates to the technical field of anti-interference of a switching power supply, in particular to an anti-interference circuit of a switching power supply.

Background

With the high-speed development of power electronic technology, the power electronic equipment has increasingly close relationship with the work and life of people, electronic equipment can not be switched off from a reliable power supply, the power supply of computers in the 80 s is comprehensively changed into a switching power supply, the power supply of computers is firstly replaced, the switching power supply enters the fields of various electronic and electrical equipment in the 90 s, the switching power supply is widely used in a program-controlled exchanger, a communication, an electronic detection equipment power supply, a control equipment power supply and the like, and the rapid development of the switching power supply technology is promoted. 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, and generally consists of a Pulse Width Modulation (PWM) control IC and a MOSFET. With the development and innovation of power electronic technology, the technology of the switching power supply is continuously innovated. At present, the switching power supply is widely applied to almost all electronic devices with the characteristics of small size, light weight and high efficiency, and is an indispensable power supply mode for the rapid development of the electronic information industry at present.

The existing switching power supply is easy to interfere with high-frequency interference generated in large dynamic links such as transformers and switching tubes and invade from a power supply end to influence normal work of an IC.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an anti-interference circuit of a switching power supply, which aims to solve the problem that the conventional switching power supply is easy to interfere with the high-frequency interference generated by large dynamic links such as a transformer, a switching tube and the like and the normal work of an IC (integrated circuit) which is influenced by the intrusion of the interference from a power supply end.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides an anti-jamming circuit of switching power supply, includes switching power supply U1 to and integrated circuit ground terminal GND, gate drive output GD, current detection input CS, supply voltage VCC, ferrite bead FB and excess temperature protection OTP of integrated installation on switching power supply U1, 6 wires are drawn forth on the switching power supply U1, divide into No. 1, No. 2, No. 3, No. 4, No. 5 and No. 6, and with integrated circuit ground terminal GND, ferrite bead FB, excess temperature protection OTP, current detection input CS, supply voltage VCC and gate drive output GD one-to-one, No. 1 and No. 5 wire electricity connection that integrated circuit ground terminal GND was drawn of supply voltage VCC of switching power supply U1 is connected in the both ends of electric capacity C1, and is parallelly connected with electric capacity C1 and has paster electric capacity EC 1.

Preferably, the power supply voltage VCC of the switching power supply U1 is further electrically connected with a resistor R1 through a No. 5 lead, and the resistor R1 is electrically connected with a diode D1 through a lead.

Preferably, a lead wire led out from the diode D1 is connected to one end of the triac T1, and the other end of the lead wire is connected to a No. 1 lead wire led out from a ground GND of an integrated circuit of the switching power supply U1.

Preferably, the model of the U1 is OB2273C switching power supply IC.

Preferably, the capacitor C1 is a 0.1uF, voltage-withstanding 50V ceramic capacitor.

Preferably, the patch capacitor EC1 is a 10uF, voltage-withstanding 50V patch capacitor, and the patch capacitor EC1 and the triac T1 are electrically connected in parallel through a wire.

Compared with the prior art, the utility model has the following beneficial effects:

the U1 is a switching power supply IC, an IC power supply circuit is formed by a diode D1 and a chip capacitor EC1 and used for providing stable power supply, and an RC low-pass filter circuit is formed by a resistor R1 and a capacitor C1 and used for filtering high-frequency interference generated by large dynamic links such as a transformer and a switching tube, so that the influence of interference on the normal work of the IC due to the intrusion of the interference from a power supply end is avoided.

Drawings

FIG. 1 is a schematic diagram of a circuit structure according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, the present invention provides a technical solution: an anti-interference circuit of a switching power supply comprises a switching power supply U1, an integrated circuit ground end GND, a gate drive output end GD, a current detection input end CS, a power supply voltage VCC, a ferrite bead FB and an over-temperature protection OTP which are integrally installed on the switching power supply U1, the model of U1 is OB2273C switching power supply IC, a diode D1 and a patch capacitor EC1 form an IC power supply line for providing stable power supply, 6 leads are led out from the switching power supply U1 and are divided into No. 1, No. 2, No. 3, No. 4, No. 5 and No. 6, the integrated circuit ground end GND, the ferrite bead FB, the over-temperature protection OTP, the current detection input end CS, the power supply voltage VCC and the gate drive output end GD are in one-to-one correspondence, the power supply voltage VCC of the switching power supply U1 and the two ends of the lead capacitors C1 led out from the integrated circuit ground end GND and the lead C1 are electrically connected with the patch capacitor EC1 in parallel connection, the capacitor C1 is 0.1uF, a voltage-withstanding 50V ceramic capacitor, the chip capacitor EC1 is 10uF, and a voltage-withstanding 50V chip capacitor, the chip capacitor EC1 and the bidirectional thyristor T1 are electrically connected in parallel through a lead, a power supply voltage VCC of the switching power supply U1 is further electrically connected with a resistor R1 through a No. 5 lead, the resistor R1 and the capacitor C1 form an RC low-pass filter circuit for filtering high-frequency interference generated by large dynamic links such as a transformer and a switching tube, interference is prevented from invading from a power supply end to influence the normal work of the IC, the resistor R1 is electrically connected with a diode D1 through a lead, the lead led out by the diode D1 is connected to one end of the bidirectional thyristor T1, and the other end is connected to a No. 1 lead led out from an integrated circuit grounding end GND of the switching power supply U1.

The working principle of the anti-interference circuit of the switching power supply is as follows: u1 is switching power supply IC, and diode D1 and paster electric capacity EC1 constitute the IC power supply line for provide stable power supply, and cooperate resistance R1 and electric capacity C1 to constitute RC low pass filter circuit, be used for filtering come from transformer, switch tube etc. big dynamic link produced high frequency interference, avoided the interference to invade from the feed end and influence IC normal work.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the utility model, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The utility model provides a switching power supply anti jamming circuit, includes switching power supply U1 to and integrated circuit ground terminal GND, gate drive output GD, current detection input CS, supply voltage VCC, ferrite bead FB and the excess temperature protection OTP of installing on switching power supply U1, its characterized in that: 6 wires are led out from the switch power supply U1 and are divided into No. 1, No. 2, No. 3, No. 4, No. 5 and No. 6, and are in one-to-one correspondence with an integrated circuit grounding end GND, a ferrite magnetic bead FB, an over-temperature protection OTP, a current detection input end CS, a power supply voltage VCC and a gate drive output end GD, the power supply voltage VCC of the switch power supply U1 and the No. 1 and No. 5 wires led out from the integrated circuit grounding end GND are electrically connected to two ends of a capacitor C1, and are electrically connected with a chip capacitor EC1 in parallel connection with the capacitor C1.

2. The switching power supply immunity circuit of claim 1, wherein: the power supply voltage VCC of the switch power supply U1 is also electrically connected with a resistor R1 through a No. 5 lead, and the resistor R1 is electrically connected with a diode D1 through a lead.

3. The switching power supply immunity circuit of claim 2, wherein: and a lead wire led out from the diode D1 is connected to one end of the bidirectional thyristor T1, and the other end of the lead wire is connected to a No. 1 lead wire led out from the ground end GND of the integrated circuit of the switching power supply U1.

4. The switching power supply immunity circuit of claim 1, wherein: the model of the U1 is OB2273C switching power supply IC.

5. The switching power supply immunity circuit of claim 1, wherein: the capacitor C1 is a 0.1uF and withstand voltage 50V ceramic capacitor.

6. The switching power supply immunity circuit of claim 3, wherein: the chip capacitor EC1 is a 10uF and voltage-resistant 50V chip capacitor, and the chip capacitor EC1 and the bidirectional thyristor T1 are electrically connected in parallel through a lead.