Pulse or digital communications – Pulse width modulation
Reexamination Certificate
2011-01-11
2011-01-11
Payne, David C (Department: 2611)
Pulse or digital communications
Pulse width modulation
Reexamination Certificate
active
07869499
ABSTRACT:
The present invention discloses a variable-frequency circuit with a compensation mechanism, which comprises: a load sensing/decision unit, a frequency-division unit and a level modulation unit. The present invention applies to a power supply having a frequency-division mode. The power supply has a feedback unit generating a feedback signal. The load sensing/decision unit determines the operational mode according to the feedback signal. The frequency-division unit generates a reference frequency signal. The level modulation unit generates a reference level signal. During frequency variation, the level modulation unit generates a compensation current to modulate the reference level signal. Thereby, the PWM unit of the power supply can adjust the working cycle of the power supply according to the reference frequency signal, the reference level signal and the feedback signal.
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Lin Kuo-Fan
Tsai Chien-Li
FSP Technology Inc.
Haider Syed
Hsu Winston
Margo Scott
Payne David C
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