一种散热风扇具脉波调宽功能的控速电路结构

Radiator fan speed control circuit structure with pulse width modulation function

Abstract

The utility model discloses a radiator fan speed control circuit structure with a pulse width modulation function. A speed control circuit is electrically connected with a pulse width modulation pin of a radiator fan control IC. The radiator fan speed control circuit structure is characterized in that the speed control circuit comprises a pulse signal input end, a pulse signal output end, a digital logic gate and a falling edge trigger and delay circuit module, the digital logic gate is arranged at a circuit prepose position of the pulse signal output end, and includes a first input contact, a second input contact and an output contact, the output contact is electrically connected with the pulse signal output end, the first input contact is electrically connected with the pulse signal input end, and the falling edge trigger and delay circuit module includes a falling edge trigger portion and a delay circuit. A pulse waveform of the speed control circuit can be widened by the aid of the falling edge triggering function and the output delay function of the falling edge trigger and delay circuit module to inputted pulse signals, thereby realizing practical inventiveness of more diverse and broader applicability of the radiator fan speed control circuit in terms of assembly and application, and better industrial utilization benefit.
一种散热风扇具脉波调宽功能的控速电路结构,所述控速电路与散热风扇控制IC所设脉宽调制接脚电性连接;其特征在于所述控速电路包括:一脉冲信号输入端;一脉冲信号输出端;一数字逻辑闸,设于脉冲信号输出端的电路前置位置,所述数字逻辑闸包括第一、第二输入接点及一输出接点,所述输出接点与所述脉冲信号输出端电性连接,所述第一输入接点与脉冲信号输入端电性连接;一负缘触发及延迟电路模块,包括一负缘触发部及延迟电路;利用所述负缘触发及延迟电路模块对输入脉冲信号的负缘触发与延迟输出作用,以令控速电路的脉冲波形能够增宽,进而令散热风扇控速电路的组装应用面达到更加多元、适用性更广泛的实用进步性与较佳的产业利用效益。

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