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Overcurrent and overvoltage protection circuit for switching power supply

A technology of over-current and over-voltage protection and switching power supply, which is applied in the direction of emergency protection circuit device, protection for over-voltage response, emergency protection device for automatic disconnection, etc. It can solve the problems of difficult procurement and high price, and achieve low price , high stability and reliability, and the effect of shortening the protection response time

Active Publication Date: 2020-11-27
NINGBO ANXIN CNC TECH
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  • Abstract
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  • Claims
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Problems solved by technology

[0003] Most of the existing switching power supplies with overcurrent and overvoltage protection functions are switching power supply modules integrated with overcurrent and overvoltage protection circuits. However, such switching power supply modules are expensive, difficult to purchase, and have certain stability and reliability. Therefore, traditional switching power supplies are still used in many applications, so it is necessary to study the overcurrent and overvoltage protection circuits for traditional switching power supplies

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  • Overcurrent and overvoltage protection circuit for switching power supply

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Embodiment Construction

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0021] Such as figure 1 As shown, the switching power supply includes a power control chip U1, an input module Input and an output module Output. The power control chip U1 adopts an existing power control chip with current sampling. The four capacitors C4, the fifth capacitor C5, the third diode D3, the first NMOS transistor K1, the transformer T1 and the transformer primary TC1, the output module Output is composed of 4 output parts SO( figure 1 Only the specific circuit of one output part SO is given, and the specific circuit structure of the other three routes is the same), and each output part SO is composed of the eleventh resistor R11, the sixth capacitor C6, the seventh capacitor C7, and the eighth capacitor C8, the fourth diode D4, the transient suppression diode TVS1, and a transformer secondary TC2, the first NMOS tube K1 is used as...

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Abstract

The invention discloses an overcurrent and overvoltage protection circuit for a switching power supply. The protection circuit comprises a first resistor, a second resistor, a third resistor, a fourthresistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first capacitor, a second capacitor, a third capacitor, a first voltage stabilizing diode, a first triode, a second triode, a third triode, a fourth triode, a first diode, a second diode and a transformer auxiliary winding. The protection circuit has the advantages that a voltage detection circuit composed ofthe transformer auxiliary winding, the second diode and the eighth resistor is used for triggering the output overvoltage protection signal of a power supply control chip; a self-locking circuit composed of the second triode, the third triode, the fourth resistor, the sixth resistor and a tenth resistor is used for locking the output state of the switching power supply and protecting the switchingpower supply; the first triode and the tenth resistor are used for achieving overcurrent detection and overvoltage detection, periodic division is carried out, overcurrent detection is carried out when a first NMOS tube is switched on, and overvoltage detection is carried out after the first NMOS tube is switched off.

Description

technical field [0001] The invention relates to a switching power supply, in particular to an overcurrent and overvoltage protection circuit for the switching power supply. Background technique [0002] In the design process of industrial electronic products, the design and application of single-channel output switching power supply and multi-channel output switching power supply are very extensive. In the industrial environment, the switching power supply is susceptible to large interference, which affects the output of single or multiple loads. When the load has voltage imbalance, overvoltage, overcurrent, short circuit, etc., the switching power supply and load will be damaged. In order to solve this technical problem, it is necessary to protect the switching power supply from overcurrent and overvoltage, which is the core technical problem of switching power supply design. [0003] Most of the existing switching power supplies with overcurrent and overvoltage protection...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/12H02H3/087H02H3/20
CPCH02H7/1213H02H3/087H02H3/202
Inventor 陈振宇林中轩周兵兵虞乾恒朱钜録张晓峰谢子方袁世博陈赛虎章江锋
Owner NINGBO ANXIN CNC TECH
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