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DC tachometer generator and single chip microcomputer interf

2015-01-02 13:16  
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DC tachometer generator and single chip microcomputer interface circuit
Figure is DC tachometer generator and single chip microcomputer interface circuit.In this system,it produces the PWM signal through the single chip microcomputer mouth to control the rotate speed of DC tachometer generator.Adding DC tachometer generator at the shaft of DC generator is used for measuring the motor's rotate speed,the tachometer generator output is analogue value,so it must A / D convert the output signal into digital tachometer signal,the tachometer signal compares with the given PWM signal through single chip microcomputer,it is used for acceleration or deceleration,thus forms the motor's closed-loop control system.