Overload protection circuit and protection method based on pwm control vehicle brushed fan

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...

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

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