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High-end over-current protection circuit

An overcurrent protection circuit, high-end technology, applied in the direction of protection that reacts to overcurrent, can solve the problems of inability to adjust the protection current threshold flexibly, high cost, and small operating voltage range of the drive circuit, and achieve a widening of the operating voltage range. , low cost, small conduction voltage drop

Active Publication Date: 2015-01-21
BEIJING JINGWEI HIRAIN TECH CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of this, the present invention provides a high-end overcurrent protection circuit to solve the problems of small operating voltage range of the drive circuit, inflexible adjustment of the protection current threshold and high cost

Method used

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Embodiment Construction

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0024] The invention provides a high-end overcurrent protection circuit to solve the problems of small working voltage range of the driving circuit, inflexible adjustment of the protection current threshold and high cost.

[0025] Specifically, such as figure 1 As shown, the high-end overcurrent protection circuit provided by the present invention includes a power switch tube U1, a detection unit 101, a first control unit 102, and a detection resistor R0; wher...

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Abstract

The invention provides a high-end over-current protection circuit which comprises a power switch tube, a detection resistor, a detection unit and a first control unit. When the detection unit detects that current on a resistor with a known resistance value exceeds a preset threshold value, a level signal is sent to the first control unit; and the first control unit receives the signal and controls a power switch to be switched off. According to the high-end over-current protection circuit, dedicated driver chips are not required, driving can be achieved only by using convention devices, and low costs are achieved; voltage difference required by the detection unit during working is basically fixed so that a current threshold value is adjusted by adjusting a resistance value of the detection resistor during over-current protection; and connection pressure drop of the power switch tube is extremely small so that when input voltage is low, the power switch tube can still be connected to enable the whole circuit to normally work, and large work voltage ranges are achieved.

Description

technical field [0001] The invention relates to the field of overcurrent protection, in particular to a high-end overcurrent protection circuit. Background technique [0002] There are many kinds of existing high-end drive circuit schemes, and the high-end drive circuit with overcurrent protection is mostly realized by using a special drive chip. When using a dedicated driver chip to implement a high-end drive circuit with overcurrent protection, not only the normal operating voltage range of the drive circuit is small, it is especially difficult to achieve normal operation below 4V; and the protection current threshold cannot be adjusted flexibly. Using a dedicated driver chip will also lead to higher implementation costs. Contents of the invention [0003] In view of this, the present invention provides a high-end overcurrent protection circuit to solve the problems of small operating voltage range of the driving circuit, inflexible adjustment of the protection current ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/08
Inventor 张猛
Owner BEIJING JINGWEI HIRAIN TECH CO INC
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