一种散热风扇的温控和pwm复合控制电路

Composite temperature and PWM controlling circuits of radiating fan

Abstract

本实用新型涉及到一种散热风扇的控制电路,特别是一种散热风扇的温控和PWM复合控制电路。一种散热风扇的温控和PWM复合控制电路,其包括温度控制电路、PWM控制电路,本实用新型的特征在于:散热风扇的温控和PWM复合控制电路设有温控与PWM兼容调节转速控制电路,其由温度控制电路、PWM控制电路、PWM与温度控制共同放大电路串联而成。温度控制转速型、PWM控制转速型及温度与PWM复合控制转速型均同时存在,并且性能稳定。具有电源反接保护,使风扇在接反电源时完好无损,而且具有最低转速恒定功能。方便改变温度控制调速的范围,只需改变热敏电阻阻值及相应电阻值来改变电压变化,即可达到其功能。
The utility model relates to a control circuit for a heat radiating fan, particularly a temperature control and a PWM composite control circuits for a heat radiating fan. The temperature control and the PWM composite control circuits for the heat radiating fan comprise a temperature control circuit and a PWM control circuit. The utility model is characterized in that the temperature control and the PWM composite control circuits for the heat radiating fan is provided with a temperature control and PWM compatible rotational speed regulating control circuit which is formed by connecting the temperature control circuit, the PWM control circuit and a temperature control common amplification circuit in series. A temperature control rotational speed type, a PWM control rotational speed type and a PWM composite control rotational speed type are simultaneously operated, and the performance is stable. The utility model has the function of power supply reverse connection protection, the fan can be at a very good condition when being connected with power supply inversely, and the control circuit for the heat radiating fan also has the function of keeping minimum rotational speed constant. The range of speed regulation for the temperature control can be conveniently changed, the voltage can be changed just needing changing the resistance of a thermal resistor and the corresponding resistance value, and then the functions can be achieved.

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