Drive device of fan moter

Abstract

This invention provides a driving device for a fan motor, which is connected between a pulse width signal generator and a controller including: a converter connected to the pulse width modulation signal generator to output a first reference voltage based on the working period of a signal generated by the generator, a reference voltage generator electrically connected to an exterior supply to generate a second reference voltage, a comparator including a first input end, a second input end and an output end, said first input end is connected with the converter, the second input end is connected with the reference voltage generator, and the output is connected with the controller, when the first reference voltage is higher than the second, the output will output a modulated signal to said controller to control the rotation speed of the fan motor.

Description

technical field [0001] The present invention relates to a driving device, in particular to a driving device applied to driving a fan motor. Background technique [0002] see figure 1 As shown, the current known technology uses a controller 2 to drive a fan motor 1. As shown in the figure, the controller 2 can be an integrated circuit device (IC), which has different pins for a Hall element 3, for example. , a temperature sensor 4, a converter 5... and other electronic circuits, wherein the Hall element 3 can obtain a phase signal from the fan motor 1 to input to the controller 2, and the temperature sensor 4 can use a thermal The sensitive resistor 41 detects the temperature and then converts a voltage signal to be input to the controller 2, and the converter 5 is mainly used to convert an externally input pulse width modulation signal (PULSE WI-DTHMODULATION; PWM) into a voltage signal for input to the controller 2. [0003] The above-mentioned controller 2 can generate ...

AI Technical Summary

Problems solved by technology

[0003] The above-mentioned controller 2 can generate a drive signal to drive the fan motor 1 after receiving the voltage signals from the converter 5 and the temperature sensor 4. Please also refer to FIG. 2 for inputting different pulse width modulation signals at different temperatures. Looking at the rotational speed relationship table corresponding to the controller, it is obvious that the curve shown in the relationship table is a linear relationship, so it can be known that the output speed of the pulse width modulation signal is in the form of a 0%-100% duty cycle at any temperature. Linear, but in practical applications, it is not necessary to increase the speed of the system when the system is turned on or in standby; in fact, for example, when a large computer is just turned on or in standby, its cooling fan will always follow this pulse width The increase of the duty cycle of the modulation signal increases the speed, and the noise generated by it is disturbing, so there is a need for improvement

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