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Automatic turn-off protection circuit for automotive load short circuit

A technology of load short-circuit and automatic shutdown, applied in the direction of protection against overcurrent, etc., can solve the problems of car spontaneous combustion, cracks, broken skin, etc.

Inactive Publication Date: 2016-10-19
天津圣纳科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, there will always be spontaneous combustion in the automobile industry. Most of them are due to the fact that the control part of the automobile circuit does not have protection functions. If the wiring harness connected to the load is exposed, it is easy to be grounded, which will cause a short circuit and cause the current in the circuit to increase rapidly. When the heat reaches a certain value, the car will spontaneously ignite

Method used

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  • Automatic turn-off protection circuit for automotive load short circuit
  • Automatic turn-off protection circuit for automotive load short circuit

Examples

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Embodiment Construction

[0011] The constantan wire R6 collects the current on the main circuit in real time and converts it into a voltage for comparison with the voltage divided by R3 and R4. When the main circuit voltage is lower than the set value, the operational amplifier comparator U1B will output a high level to turn on the transistor N1. After the conduction, the collector outputs a low level output to the U- terminal, so that U+ is always greater than U-, and the output is always high at this time, forming a closed-loop self-locking loop.

[0012] At the same time, the high-level output of the comparator U1B is output to D1 to turn off the load output circuit, so that it can achieve the function of short-circuit protection.

[0013] Resistor R8 and capacitor C1 prevent false protection and filter out clutter to ensure the initial state of the triode without false operation.

[0014] When there is protection and self-locking in the circuit, it can only be restored to use after the user cuts o...

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PUM

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Abstract

The invention relates to an automatic turn-off protection circuit for an automotive load short circuit. The automatic turn-off protection circuit comprises an MCU control circuit, a load output circuit, an output detection circuit, and a comparison self-locking circuit. Under the circumstance that an automotive load short-circuit protection control circuit works normally, the MCU control circuit outputs a control signal to realize conduction of the load output circuit, thereby controlling vehicle power supply equipment like vehicle lights and a windscreen wiper; when a line aging bonding phenomenon occurs at vehicle load equipment, the output detection circuit collects voltages on a main circuit and outputs the voltage values to the comparison self-locking circuit to carry out comparison, thereby turning off the load output circuit. According to the invention, the comparison self-locking circuit can be adjusted to control the currents at the main circuit in a short-circuit mode, so that damages of the output load due to the over-current phenomenon can be avoided. Therefore, the circuit device can be protected; the cost can be saved; and the risk can be reduced.

Description

technical field [0001] The invention belongs to the field of automobile electronics, and relates to an automobile load short-circuit automatic shutdown protection circuit, which protects the electronic load short-circuit. Background technique [0002] At present, there will always be spontaneous combustion in the automobile industry. Most of them are due to the fact that the control part of the automobile circuit does not have protection functions. If the wiring harness connected to the load is exposed, it is easy to be grounded, which will cause a short circuit, causing the current in the circuit to increase rapidly, and when the heat reaches a certain value, the car will spontaneously ignite. [0003] The invention protects the circuit through a simple device. When the load is short-circuited, it will automatically detect the current on the main circuit. Once the current increases to a certain value, it will turn off the load output part, thereby ensuring that the device w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H3/08
Inventor 韩军王文安邢利军
Owner 天津圣纳科技有限公司
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