Variable frequency PWM controller circuit

Details Variable frequency PWM controller circuit Variable frequency PWM controller circuit

2006-09-12

2006-09-12

Shingleton, Michael B (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S295000, C331S074000, C331S143000, C323S268000, C323S288000, C363S089000

Reexamination Certificate

active

07106130

ABSTRACT:
The present invention discloses a circuit that generates a variable frequency pulse width modulation (VF PWM) signal. Different from the conventional PWM controller, the frequency and duty cycle of the output PWM signal vary with the error-amplified voltage of the feedback loop simultaneously in this invention. The higher the error-amplified voltage of the feedback loop is, the lower the duty cycle with lower frequency will be. A very low duty cycle PWM signal can be generated stably while its frequency is very low.

REFERENCES:
patent: 3944949 (1976-03-01), Herzog
patent: 6107894 (2000-08-01), Van Tuijl et al.
patent: 6225872 (2001-05-01), Verhoeven
patent: 6608521 (2003-08-01), Baldwin et al.
patent: 6728121 (2004-04-01), Ben-Yaakov et al.
patent: 2005/0077971 (2005-04-01), Bashar

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