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Control method for overvoltage protection and control circuit used for power supply controller

A technology of a power supply controller and a control method, which can be applied to emergency protection circuit devices, circuit devices, electrical components, etc., and can solve the problem of high surge

Active Publication Date: 2013-03-13
LEADTREND TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When detecting the output voltage V on the output terminal OUT OUT When the feedback loop is disconnected, the output voltage V OUT may spike abnormally high

Method used

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  • Control method for overvoltage protection and control circuit used for power supply controller
  • Control method for overvoltage protection and control circuit used for power supply controller
  • Control method for overvoltage protection and control circuit used for power supply controller

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Embodiment Construction

[0037] Figure 4 shows that the OVP control circuit 60 implemented according to the present invention can replace figure 2 The OVP control circuit 30 in. The OVP control circuit 60 can quickly resume power conversion after the transient noise disappears, which can shorten Figure 3B Too long stagnation period T HOLD .

[0038] The OVP control circuit 60 has a comparator 64 , a comparator 68 , a multiplexer (multiplexer) 66 , a low-pass filter 62 , and an AND gate (And Gate) 70 .

[0039] The low-pass filter 62 detects the operating power supply voltage V CC , after low-pass filtering, the filtered voltage V CC-LPF . As can be known from simple circuit theory, the low-pass filter 62 is equivalent to limiting the filtered voltage V CC-LPF For operating supply voltage V CC response speed while operating the supply voltage V CC with the filtered voltage V CC-LPF The difference between, essentially corresponds to the operating supply voltage V CC the slope of the change...

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PUM

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Abstract

Provided are a control method for overvoltage protection and a control circuit used for a power supply controller. The power supply controller is powered by an operation power supply end. The operation power supply end is provided with operation power supply voltage. When the operation power supply voltage exceeds an overvoltage reference value, the power supply controller stops electric energy conversion of a power supply converter. The control circuit contains a gradient detector which detects a change gradient of the operation power supply voltage. When the change gradient exceeds a descending gradient, the gradient detector restores electric energy conversion of the power supply converter. When the electric energy conversion of the power supply converter is restored, the power supply controller compares the operation power supply voltage with the overvoltage reference value.

Description

technical field [0001] The present invention relates to a control circuit and a control method in a power controller, especially to a control circuit and a control method for over voltage protection in a power controller. Background technique [0002] A power converter is an indispensable electronic device in electronic products, which is used to provide voltage or current power required by other electronic devices. The power converter must also be designed to provide many different protections, such as over load protection (OLP), over temperature protection (OTP), output short protection (output short protection), over voltage protection ( over voltage protection) and so on. These protections are used to prevent disasters that may be caused by the power converter in abnormal conditions. [0003] When the feedback loop that senses the output voltage is broken, OVP prevents the output voltage from going high because the power converter keeps increasing its output power. Ex...

Claims

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Application Information

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IPC IPC(8): H02H7/12H02H3/06
Inventor 沈逸伦
Owner LEADTREND TECH