Patent ID: 8395457

Claim:
A pulse width modulation signal generator comprising: a triangular wave generator to generate a triangular wave signal and a pair of first and second pulse signals, the first pulse signal being pulsed for a first duration of time when the triangular wave signal reaches a minimum limit thereof, the second pulse signal being pulsed for a second duration of time when the triangular wave signal reaches a maximum limit thereof; a voltage comparator connected to the triangular wave generator to generate a first pulse width modulation signal by comparing the triangular wave signal with a direct current signal supplied from a signal source external to the pulse width modulation signal generator; and a wave shaping circuit connected to the triangular wave generator and the voltage comparator to generate a second pulse width modulation signal by removing chattering components occurring immediately after at least one of a rising edge and a falling edge of the first pulse width modulation signal with a first masking signal generated based on the first and second pulse signals and the first pulse width modulation signal, wherein the wave shaping circuit outputs either one of the first and second pulse signals as the second pulse width modulation signal where the masking signal is not triggered.