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Over-current protection circuit and vehicle-mounted device

A technology of overcurrent protection and circuit, which is applied in the direction of overcurrent protection, emergency protection circuit device, automatic disconnection emergency protection device, etc., and can solve problems such as cumbersome operation

Inactive Publication Date: 2018-07-27
FAURECIA CLARION ELECTRONICS (XIAMEN) CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0004] Embodiments of the present invention provide an overcurrent protection circuit and vehicle-mounted equipment. After the current protection circuit cuts off the current flowing to the external device, it re-conducts the current protection circuit after a preset time threshold to provide current to the external device, avoiding the The problem of cumbersome operation in the prior art

Method used

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  • Over-current protection circuit and vehicle-mounted device
  • Over-current protection circuit and vehicle-mounted device
  • Over-current protection circuit and vehicle-mounted device

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Embodiment Construction

[0025] 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.

[0026] An embodiment of the present invention provides an overcurrent protection circuit 10 applied to vehicle-mounted equipment, wherein the overcurrent protection circuit 10 is arranged between a power supply 20 and an external device 30, and includes: a first switching transistor 11, a current limiting resistor 12, a second A voltage dividing resistor Rin, a current detection amplifier 13, a second voltage dividing resistor Rout, a voltage detector 14, a mon...

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Abstract

The embodiment of the invention, which belongs to the auto spare parts, provides an over-current protection circuit and a vehicle-mounted device so that the current protection loop is connected againafter a preset time threshold to provide a current for an external device after the current protection loop cuts off the current flowing to the external device and thus a problem of tedious operationin the prior art can be solved. The over-current protection circuit arranged between a power supply and an external device is composed of a first switching transistor, a current-limiting resistor, a first voltage-dividing resistor, a current detecting amplifier, a second voltage-dividing resistor, a voltage detector, and a monostable trigger, a timer, and a second switching transistor. The over-current protection circuit is used for providing power for an external device.

Description

technical field [0001] Embodiments of the present invention relate to auto parts, in particular to an overcurrent protection circuit and vehicle equipment. Background technique [0002] With the development of car multimedia, the application of on-board equipment is becoming more and more extensive. In order to expand the functions of on-board equipment, the on-board equipment usually supports power supply to external devices connected. In order to protect the on-board equipment, in the prior art, usually in the detection When the current provided by the on-board equipment to the external equipment exceeds the rated current (overcurrent), the switching element in the over-current protection circuit cuts off the current flowing to the external equipment, thereby realizing the protection of the on-board equipment. [0003] However, in the prior art, after the current protection circuit cuts off the current flowing to the external device, if the fault is eliminated, the operato...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/08H02H3/06
CPCH02H3/08H02H3/066
Inventor 黄延毅
Owner FAURECIA CLARION ELECTRONICS (XIAMEN) CO LTD
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