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Over-current protection method, over-current protection circuit and power supply applying over-current protection circuit

An over-current protection circuit and over-current protection technology, applied in emergency protection circuit devices, over-current-responsive protection, circuit devices, etc., can solve problems such as over-current protection failure, and achieve the effect of avoiding over-current protection failure

Pending Publication Date: 2022-05-17
JOULWATT TECH INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the first signal Vvs is greater than V A When the OCP curve is higher than the OPP curve, the over-current protection (OCP) does not work at this time, and the over-power protection (OPP) that really works, that is, there is a problem of over-current protection failure

Method used

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  • Over-current protection method, over-current protection circuit and power supply applying over-current protection circuit
  • Over-current protection method, over-current protection circuit and power supply applying over-current protection circuit
  • Over-current protection method, over-current protection circuit and power supply applying over-current protection circuit

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Effect test

Embodiment 1

[0056] figure 2 A circuit block diagram of an overcurrent protection circuit according to an embodiment of the present invention is shown. The overcurrent protection circuit includes: an output voltage sampling circuit 10 , an output current sampling circuit 20 , an overcurrent threshold generation circuit 30 and a comparison circuit 40 . Wherein, the output voltage sampling circuit 10 samples from the power supply to output a first signal representing the output voltage of the power supply; the output current sampling circuit 20 samples from the power supply to output a second signal representing the output current of the power supply; the overcurrent threshold generates The circuit 30 receives the first signal to output an overcurrent threshold signal, wherein the overcurrent threshold signal is equal to the first overcurrent threshold when the first signal is below a first reference value, and is equal to the first overcurrent threshold when the first signal is greater than...

Embodiment 2

[0072] The first embodiment of the present invention may represent a case where the second signal representing the output current information of the power supply is a voltage signal. The second embodiment is taken as an example below to introduce the case where the second signal is a current signal.

[0073] Such as Figure 4a Shown is a schematic structural diagram of the overcurrent protection circuit of the second embodiment of the present invention. The overcurrent protection circuit of this embodiment includes an output voltage sampling circuit 210 , an output current sampling circuit 220 , an overcurrent threshold generation circuit 230 , and a comparison circuit 240 . Wherein, the output voltage sampling circuit 210 samples the first signal Vo_s which can represent the output voltage information of the power supply from the power supply. The output current sampling circuit 220 samples the second signal Io_s from the power supply to represent the output current informati...

Embodiment 3

[0080] The first embodiment and the second embodiment of the present invention may represent that the overcurrent threshold signal is equal to the first overcurrent threshold when the first signal is below the first reference value, and when the first signal is greater than the first reference value As the first signal increases and decreases linearly, the following takes the third embodiment as an example to introduce that the overcurrent threshold signal is equal to the first overcurrent threshold when the first signal is below the first reference value, When the first signal is greater than the first reference value, it changes in stages as the first signal increases.

[0081] Such as Figure 5aShown is a schematic structural diagram of an overcurrent protection circuit according to the third embodiment of the present invention. The overcurrent protection circuit includes an output voltage sampling circuit 310 , an output current sampling circuit 320 , an overcurrent thresh...

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PUM

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Abstract

The invention discloses an overcurrent protection method, an overcurrent protection circuit and a power supply applying the overcurrent protection circuit, and the method comprises the steps: obtaining a first signal representing an output voltage from the power supply, obtaining an overcurrent threshold signal according to the first signal, obtaining a second signal representing an output current from the power supply, and obtaining an overcurrent threshold signal according to the second signal; and an overcurrent protection signal is obtained according to the second signal and the overcurrent threshold signal, when the second signal is greater than the overcurrent threshold signal, it is represented that the output current of the power supply is overcurrent, and the power supply carries out overcurrent protection. Wherein the over-current threshold signal is equal to a first over-current threshold when the first signal is below a first reference value, and is less than the first over-current threshold when the first signal is greater than the first reference value.

Description

technical field [0001] The invention relates to electronic circuit technology, in particular to an overcurrent protection method, an overcurrent protection circuit and a power supply using the same. Background technique [0002] For the current mobile phone, notebook computer and other adapters that need to use a wide output voltage, there is a corresponding full-load power under different output voltages. According to the OPP (Over Power Protection) converter, over-power often occurs under low-voltage output conditions. In the case of high protection points, especially for current PD chargers, considering the requirements of safety certification, there will generally be LPS (limited power supply) restrictions, which require that the output current cannot exceed 8A under different output voltages, and corresponding overcurrent protection. [0003] Taking the flyback converter as an example, its OPP (Over Power Protection) is generally limited by the maximum peak current of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/12H02H3/08H02H3/05
CPCH02H7/1203H02H3/08H02H3/006H02H3/05
Inventor 杨洋
Owner JOULWATT TECH INC LTD