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
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[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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