BACK ELECTROMOTIVE FORCE DETECTION CIRCUIT, AND MOTOR DRIVING CONTROL APPARATUS AND MOTOR USING THE SAME

PROBLEM TO BE SOLVED: To provide a back electromotive force detection circuit, and a motor driving control apparatus and a motor using the same.SOLUTION: A back electromotive force detection circuit includes: a voltage generating unit generating a voltage in inverse proportion to a duty ratio of a p...

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Bibliographische Detailangaben
1. Verfasser:	LEE SOO-WOON
Format:	Patent
Sprache:	eng
Schlagworte:	CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a back electromotive force detection circuit, and a motor driving control apparatus and a motor using the same.SOLUTION: A back electromotive force detection circuit includes: a voltage generating unit generating a voltage in inverse proportion to a duty ratio of a pulse width modulation (PWM) signal; a variable amplifier controlling a gain according to the voltage generated by the voltage generating unit, and amplifying back electromotive force according to the controlled gain; and a comparator comparing an output from the variable amplifier with a pre-set reference signal, and outputting a zero-crossing signal of the back electromotive force.