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Over-current protection circuit

An over-current protection circuit and protection circuit technology, applied in the direction of adjusting electrical variables, control/regulation systems, instruments, etc., can solve problems such as limiting the application range of over-current protection circuits, improve reliability, ensure accurate sampling, and improve conversion efficiency effect

Pending Publication Date: 2019-12-10
丹阳恒芯电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the over-current protection circuits commonly used at present have some problems such as reliability, over-current shutdown power consumption, etc., which limit the application range of these over-current protection circuits.

Method used

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  • Over-current protection circuit

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Embodiment Construction

[0012] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0013] combine figure 1 As shown, in the following embodiments, the overcurrent protection circuit includes:

[0014] A fold-back circuit, when over-current occurs, the output current decreases with the decrease of the output voltage, which greatly reduces the system's over-current shutdown power consumption; a core protection circuit, because the sampling resistor is not connected in series with the adjustment tube, there is no loss Voltage drop improves the conversion efficiency of the system; a negative feedback circuit ensures accurate sampling of the output current and greatly improves the reliability of overcurrent protection.

[0015] Described core protection circuit is made of PM4 tube, PM5 tube, PM6 tube, NM3 tube, resistance R3 and a comparator; Wherein PM6 tube is adjusting tube, and PM4 tube is sampling tube, and R3 is sampling res...

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Abstract

The invention discloses an over-current protection circuit, which comprises a turn-back circuit, which enables an output current to be reduced along with the reduction of an output voltage when the over-current occurs, thereby greatly reducing the over-current turn-off power consumption of a system; a core protection circuit which enables the conversion efficiency of the system to be improved because a sampling resistor is not connected in series with an adjusting tube, and no voltage drop is lost; and a negative feedback circuit which ensures the accurate sampling of the output current and greatly improves the reliability of the over-current protection. The over-current protection circuit has the advantages of low over-current turn-off power consumption, high reliability, high conversionefficiency and the like.

Description

technical field [0001] The invention relates to the field of protection circuits, in particular to an overcurrent protection circuit. Background technique [0002] With the rapid development of electronic technology, DC / DC converters have been widely used in various mobile electronic systems, such as mobile communication terminals, portable computers, PDAs and so on. As a kind of DC / DC converter, the LDO linear regulator is widely used in portable electronic products due to its simple structure, low cost, low noise, low power consumption and small package size. [0003] The over-current protection technology in LDO has always been the key to the stable operation of the LDO system. The purpose of overcurrent protection is to limit the output current within a fixed range, and protect the entire system or load when the output is short-circuited or overloaded. However, the over-current protection circuits commonly used at present have some problems such as reliability, over-cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/46G05F1/569
CPCG05F1/461G05F1/569
Inventor 陈磊
Owner 丹阳恒芯电子有限公司
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