Overload protection circuit based on PWM control vehicle brush fan and protection method

A technology of overload protection circuit and switch control circuit, which is applied in the direction of emergency protection circuit devices and electrical components, etc. It can solve the problems of damage to the drive circuit of the controller, easy wear of brushes, and increased current, so as to reduce the failure rate and improve The safety performance of the whole vehicle and the effect of reducing the maintenance cost

Active Publication Date: 2016-10-26
ZHENGZHOU JINGYIDA AUTO PARTS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional cooling system, using mechanical fans, high energy consumption, low failure rate
The new heat dissipation system, the brushed fan controlled by the electronic controller, adopts PWM control to realize stepless variable speed, intelligent control with temperature, effectively reduces energy consumption, and has been widely promoted. However, due to the extremely harsh installation environment, the brushes of the brushed fan It is easy to wear and tear, and the failure rate is very high. The failure phenomenon is locked rotor and short circuit. Scrap, or cause a vehicle fire

Method used

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  • Overload protection circuit based on PWM control vehicle brush fan and protection method
  • Overload protection circuit based on PWM control vehicle brush fan and protection method

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Embodiment Construction

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, so as to better understand the present invention, but the protection scope of the present invention is not limited thereto.

[0022] Such as figure 2 As shown, an overload protection circuit based on PWM control of a vehicle-mounted brushed fan, the protection circuit includes a switch control circuit 1 , an amplifier circuit 2 , a power supply circuit 3 , a MOS drive shaping circuit 4 and a fan drive circuit 5 . The PWM signal is output from the PWM_B_OUT microcontroller and used as the input of the drive circuit of the brushed fan controller. PWM_B_OUT is used as the input terminal of the switch control circuit 1. The input terminal is marked as node TP8. The node TP8 is connected to the resistor R8, and the resistor R8 is grounded through the resistor R10. The node connected between R8 and resistor R10 is TP9, the node TP9 is connected to t...

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Abstract

The invention relates to the circuit overload protection technical field, more specifically an overload protection circuit based on a PWM control vehicle brush fan and a protection method. The protection circuit comprises an ON-OFF control circuit, an amplification circuit, a power supply circuit, an MOS driving waveshaping circuit and a fan drive circuit which are successively in connection. The MOS driving waveshaping circuit is used for shaping voltage signals from the amplification circuit into voltage signals suitable for the fan drive circuit; the fan drive circuit is used for utilizing the voltage signals from the MOS driving waveshaping circuit to drive a fan to run through an MOS. The overload protection circuit can effectively prevent the driving MOS of a fan governor from being burned caused by large current generated at the moment of fan stalling or short circuit, thereby reducing the failure rate of the fan governor, reducing vehicle maintenance costs, and improving vehicle safety performance.

Description

technical field [0001] The invention relates to the technical field of circuit overload protection, in particular to an overload protection circuit and protection method for controlling a vehicle-mounted brushed fan based on PWM. Background technique [0002] With the continuous increase of urban vehicles, the continuous deterioration of the environment and the depletion of traditional energy sources, automotive energy-saving technology has become the focus of current industry development. Regardless of the motor or the engine, the cooling system is very important. The traditional heat dissipation system adopts mechanical fans, which has high energy consumption and low failure rate. The new heat dissipation system, the brushed fan controlled by the electronic controller, adopts PWM control to realize stepless variable speed, intelligent control with temperature, effectively reduces energy consumption, and has been widely promoted. However, due to the extremely harsh install...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/085
CPCH02H7/0855
Inventor 温向超郝政伟徐西亚杨冬庆耿全领宋华磊
Owner ZHENGZHOU JINGYIDA AUTO PARTS
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