PWM CONTROLLER

A PWM(Pulse Width Modulation) controller is provided to reduce damage of a switching element and improve noise generation due to counter electromotive force. A PWM(Pulse Width Modulation) controller includes a phase sensing unit, a flywheel circuit, and a PWM control unit. The phase sensing unit sen...

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Bibliographic Details
Main Authors KIM, HYUNG CHUL, LEE, HUYN GYOO, CHOI, DAE SOO, SONG, JAE HONG, CHOI, YOUNG SICK
Format Patent
LanguageEnglish
Published 29.04.2008
Subjects
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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Summary:A PWM(Pulse Width Modulation) controller is provided to reduce damage of a switching element and improve noise generation due to counter electromotive force. A PWM(Pulse Width Modulation) controller includes a phase sensing unit, a flywheel circuit, and a PWM control unit. The phase sensing unit senses a crossover section from input AC power. The flywheel circuit transmits electromotive force generated in crossover. The PWM control unit determines the crossover section based on a signal sensed in the phase sensing unit and sends a signal for maintaining a turn-on or turn-off state of a switching element(Q3) in the crossover section. The phase sensing unit includes a resistor(R1) and a photocoupler(PC). The resistor limits current to detect the crossover section. The photocoupler is connected to the resistor in series.
Bibliography:Application Number: KR20080009334