Short circuit protection circuit

A short-circuit protection circuit and output circuit technology, applied in circuits, electrical components, electronic switches, etc., can solve problems such as excessive voltage and breakdown damage of wiring, and achieve the effect of improving reliability and safety.

Pending Publication Date: 2022-01-11
SG MICRO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned technical problems, the present invention provides a short-circuit protection circuit, which can improve the problem that the parasitic inductance of the connection line generates excessive voltage due to the too fast disconnection of the load switch, resulting in excessive voltage changes, resulting in breakdown damage.

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Embodiment Construction

[0030] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Preferred embodiments of the invention are shown in the accompanying drawings. However, the present invention can be implemented in different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention.

[0032] Hereinafter, the present invention will be described in detail with reference t...

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Abstract

The invention relates to the technical field of analog circuits, and provides a short-circuit protection circuit which comprises an output circuit which is connected to the ground in series with a first resistor and provides a first control signal through a connection node of the output circuit and the first resistor; the control circuit is connected with the output circuit and is provided with a first input end for receiving a first control signal and a first output end, and the first output end is used for transmitting a second control signal to the output circuit; the drive circuit is connected with the control circuit and is provided with a second input end for receiving the switch control signal and a second output end, the second output end is used for transmitting a second control signal generated by the drive circuit to the control circuit, and in the short-circuit state, the control circuit adjusts the state of the control circuit according to the first control signal so as to control the switch. The second control signal is changed to reduce the short-circuit current of the output circuit. Therefore, the reliability and the safety of the circuit with the load switch can be improved.

Description

technical field [0001] The invention relates to the technical field of analog circuits, in particular to a short circuit protection circuit. Background technique [0002] In higher-end electronic equipment, such as mobile phones and other equipment, an external power supply charger and other power supply equipment are often connected through a load switch, and the instability of the power grid and external equipment often causes rapid and large changes in the input power supply voltage, so , this type of load switch usually adds OVP (Over Voltage Protection, overvoltage protection) and overcurrent protection functions, that is, when the input voltage exceeds the set voltage value and the current exceeds the set voltage value, the load switch will be turned off. And then protect the internal circuit from external high voltage impact. The turn-off time Toff of the load switch is an important indicator. The faster the turn-off speed means the occurrence of external overvoltage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K17/082
CPCH03K17/0822
Inventor 谭磊骞海荣
Owner SG MICRO
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