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Overcurrent protection circuit

A technology for protecting circuits and overcurrent, applied to electrical components, output power conversion devices, etc., can solve problems such as internal circuit damage and output terminal overcurrent, and achieve the effect of increasing applications

Active Publication Date: 2020-10-30
亚瑞源科技(深圳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the switching power supply device may cause overcurrent at the output terminal due to short circuit or overload, which will damage the internal circuit

Method used

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  • Overcurrent protection circuit

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Embodiment Construction

[0007] Please refer to figure 1 , the switching power supply device SPS has an input terminal 10 and an output terminal 20 , and the output terminal 20 includes a first terminal 21 and a second terminal 22 . The switching power supply device SPS receives the input voltage VIN through the input terminal 10, and converts the input voltage VIN into an output voltage VOUT, and the switching power supply device SPS transmits the output voltage VOUT through the first terminal 21 and the second terminal 22 To the required load, the load is, for example, an electronic device such as a POS cash register. The switching power supply device SPS includes a noise filter 110, an AC / DC conversion circuit 120, a transformer circuit 130, a switch circuit 140, a pulse width modulation control circuit 150, a rectifier circuit 160, an energy storage unit 170, a feedback circuit 180, a signal The isolation unit 190 , the over-current detection circuit 200 and the over-current protection control ci...

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Abstract

Disclosed is an overcurrent protection circuit applicable to a switching type power supply apparatus. The overcurrent protection circuit disclosed in the embodiment comprises an overcurrent detectioncircuit and an overcurrent protection control circuit; the overcurrent detection circuit can determine whether to generate an overcurrent protection trigger signal or not according to the output current of the switching type power supply apparatus; and the overcurrent protection control circuit can enable a pulse width modulation control circuit of the switching type power supply apparatus to stopoutputting a pulse width modulation signal according to the overcurrent protection trigger signal.

Description

technical field [0001] The present invention relates to an over-current protection circuit, in particular to an over-current protection circuit suitable for a switching power supply device. Background technique [0002] The switching power supply device can receive external power, such as AC power, and convert the external power into a voltage required by the load, such as a stable DC voltage. Therefore, the switching power supply device needs to have a stable output capability. However, the switching power supply device may cause overcurrent at the output end due to short circuit or overload, which may damage the internal circuit. Therefore, how to effectively protect the switching power supply device when overcurrent occurs has become an issue that researchers in this field pay attention to. Contents of the invention [0003] In order to solve the above-mentioned shortcomings, the present invention proposes an embodiment of an overcurrent protection circuit suitable for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/32
CPCH02M1/32
Inventor 苏肖石开源
Owner 亚瑞源科技(深圳)有限公司
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