Power source short-circuit protection apparatus

A protection device and power supply short-circuit technology, which is applied in the field of power supply, can solve the problems of complex protection performance and poor short-circuit protection circuit, and achieve the effect of realizing short-circuit protection function, saving cost and improving reliability

Inactive Publication Date: 2007-11-28
南通国邦科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a short-circuit protection circuit, which avoids the shortcomings of the existing short-circuit protection circuit which are complicated or have poor protection performance.

Method used

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  • Power source short-circuit protection apparatus
  • Power source short-circuit protection apparatus
  • Power source short-circuit protection apparatus

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Embodiment Construction

[0016] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0017] Fig. 1 is a schematic diagram of the principle of the present invention. D1 is the main control chip of the power supply, and the HiDown terminal is one of its ports. If the potential of this port is higher than a certain value, the chip will be turned off; the Vh terminal is a high potential provided by the reference high voltage generation circuit, and the potential value should be enough to make D1 is turned off; the Is terminal is the detection signal of the current sampling circuit; S1 is a switch; when the signal at the Is terminal is greater than or equal to the required short-circuit protection value, the switch S1 is turned on, and the potential of the Vh terminal is connected to the HiDown terminal of D1. Make D1 turn off the output, so that the power supply is turned off to achieve the purpose of short circuit protection.

[0018] The present invent...

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PUM

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Abstract

A power short circuit protection device relates to power source field in which a primary high voltage generation circuit generates a voltage value larger than or equal to the high potential protection value of a chip, current sampling circuit controls switch conduction when the sampling signal larger than or equal to the short circuit protection value to make the primary high voltage generation circuit connect with chip high potential protection end by the switch, so as to switch off the power output for protection.

Description

technical field [0001] The invention relates to the field of power supplies, in particular to a power supply in which the main control chip is a pulse width modulator. Background technique [0002] Generally, the short-circuit protection circuit of the power supply adopts the following methods: detect the input or output current of the power supply, and process the current detection signal. When the signal is greater than a certain value, it is considered that the power supply is in a short-circuit state, and then by processing the signal, Make the power supply stop working to achieve the purpose of protection. Currently, there are four main processing methods: [0003] Method 1: When the current detection signal is greater than a certain value, pull down the remote control terminal of the power supply to stop the power supply. This method is only applicable to the shutdown module when the remote control terminal is low. [0004] Method 2: When the current detection signal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/28
Inventor 丁贤后
Owner 南通国邦科技发展有限公司
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