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Overcurrent and overvoltage protection circuit in switch power supply

An overcurrent and overvoltage protection, switching power supply technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of large changes in protection points and unreliable protection action, and achieve the effect of hysteresis function and simple circuit structure

Active Publication Date: 2013-07-03
58TH RES INST OF CETC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide an overcurrent and overvoltage protection circuit, which aims to solve the problems of large changes in the protection point and unreliable protection action of the existing overcurrent and overvoltage protection circuit

Method used

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  • Overcurrent and overvoltage protection circuit in switch power supply
  • Overcurrent and overvoltage protection circuit in switch power supply
  • Overcurrent and overvoltage protection circuit in switch power supply

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Embodiment Construction

[0011] The present invention will be further described below in conjunction with drawings and embodiments.

[0012] Such as figure 2 As shown, the overcurrent and overvoltage protection circuit of the present invention includes: (1) the voltage input first branch composed of resistors R1, R2, R5, PNP transistors Q1, Q2, Q5; resistors R3, R4, R6 , PNP tube Q3, Q4, Q6 composed of voltage input second branch; by NPN tube Q8, Q9, PNP tube Q10, Q11, Q12, Q13, NPN tube Q14, Q15, resistor R8 comparator circuit composed of resistor R8; A hysteresis circuit composed of R7, R9, and NPN tube Q7; VDD is an externally provided power supply, connected to the emitter terminals of Q10, Q11, Q12, and Q13, and one end of R1, R2, R3, and R4 is connected to VDD; Vref is an externally provided power supply The reference voltage is connected to the base terminal of Q6; Vi is the positive input signal terminal of the overcurrent and overvoltage protection circuit, connected to the base terminal of...

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Abstract

The invention relates to an overcurrent and overvoltage protection circuit, in particular to an overcurrent and overvoltage protection circuit in a switch power supply. The circuit is used for detecting whether the input current and voltage of a system are in a normal operation range of a chip; when the current or voltage exceeds the normal operation range of the system, a module outputs an overcurrent and overvoltage protection signal; and when the system temperature is restored to be within a normal operating voltage and current range, the module outputs a normal overcurrent and overvoltagesignal. The protection circuit can be integrated in a control chip to realize the minimum circuit scale, and provides a reliable protection structure.

Description

technical field [0001] The invention relates to an overcurrent and overvoltage protection circuit, in particular to an overcurrent and overvoltage protection circuit that can be integrated in a switching power supply control chip. Background technique [0002] Switching power supplies have been widely used in various fields to provide working voltage for various equipment. The existing switching power supply technology generally includes control chips, drive circuits, switching circuits, rectification and filter circuits, etc. Generally speaking, the control chip contains reference circuits, power management circuits, oscillation circuits, and various protection circuits. The protection circuit generally includes overvoltage protection, undervoltage protection, overcurrent protection and overtemperature protection. This patent mainly involves the overcurrent and overvoltage protection in the protection circuit, and provides a practical circuit structure that can be integra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/10
Inventor 易峰吴旭虞志国张又丹
Owner 58TH RES INST OF CETC
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