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Need circuit design of a PWM controlled DC motor

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zedarab

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pwm controlled DC motor

A UC 3524AN PWM is needed to control the sweeping motion of the fan. the objective is to slow down the sweeping motion of the fan when an object is detected by an IR sensor and the speed will resume as per normal when the sensor doesn't detect anything. can anyone provide me with the circuitry design..tanx for your information.
 

Re: pwm controlled DC motor

Something like you want should be descibed in that application note. Maybe you can use that signal from sensor to break power supply to fan for a while. Also try to find another app note for other chip.
 

Re: pwm controlled DC motor

Without going into details, you will need a small microcontroller that will take signal from IR sensor and a digital potentiometer (od D/A converter) that will, together with output voltage (an op-amp in SUM configuration) generate a signal for the error amplifier of the 3524. By doing this your circuit will slow down the fan when the IR detedct something and return to normal condition after this alarm signal is off..
 

pwm controlled DC motor

by the way, can you tell me the role of frequency in PWM. I mean, Is there any difference between 1KHz with PWM and 2KHz with PWM??
 

Re: pwm controlled DC motor

This article is titled: "Choosing the right PWM frequency" and I hope will answer your question.

**broken link removed**
 

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