Pulse width modulation circuit

Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...

Reexamination Certificate

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Reexamination Certificate

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07315158

ABSTRACT:
A PWM circuit includes a counter, a cycle register, a cycle detector, a pulse width register, a pulse width detector, an additional pulse width register, a voltage generator, a selector, and a voltage controller. The voltage controller controls the selector so as to add a first additional pulse at a first voltage to the end of a pulse width, based on a cycle detection signal outputted by the cycle detector, a pulse width detection signal outputted by the pulse width detector, and a set value indicating the first voltage of the first additional pulse outputted by the additional pulse register, thereby deciding a voltage outputted from the PWM circuit and a period in which the voltage is output.

REFERENCES:
patent: 6801146 (2004-10-01), Kernahan et al.
patent: 6819190 (2004-11-01), Pearce et al.
patent: 6825644 (2004-11-01), Kernahan et al.
patent: 6841983 (2005-01-01), Thomas
patent: 7157889 (2007-01-01), Kernahan et al.
patent: 7-183779 (1995-07-01), None

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