Pulse width modulation control system
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United States of America Patent
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Sep 14, 2004
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N/A
app pub date -
Jul 7, 2000
filing date -
Jul 9, 1999
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Abstract
The present invention relates to a pulse width modulation control system which is capable of preventing arm short phenomenon and controlling a operation circuit precisely by securing dead time. The present invention comprises a counter which sets initial voltage value differently and outputs chopping wave crossed at its maximum voltage value and minimum voltage value, an adder/subtracter which adds/subtracts signal generated by the counter, a reference voltage value generation unit which is inputted signal outputted from the adder/subtracter and outputs two different reference voltage values to single chopping wave, a comparator which compares reference voltage value generated by the reference voltage value generation unit with voltage value outputted from the adder/subtracter, and an output control unit which outputs PWM (Pulse Width Modulation) positive signal (S.sub.PWM+) or PWM (Pulse Width Modulation) negative signal (S.sub.PWM-) in accordance with the output voltage value of the comparator.
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