Voltage regulator that operates in either PWM or PFM mode

Details Voltage regulator that operates in either PWM or PFM mode Voltage regulator that operates in either PWM or PFM mode

1994-09-27

1996-10-22

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323287, 323224, G05F 140

Patent

active

055680445

ABSTRACT:
A switching voltage regulator achieves high efficiency by automatically switching between a pulse frequency modulation (PFM) mode and a pulse-width modulation (PWM) mode. Switching between the modes of voltage regulation is accomplished by monitoring the output voltage and the output current, wherein the regulator operates in PFM mode at small output currents and in PWM mode at moderate to large output currents. PFM mode maintains a constant output voltage by forcing the switching device to skip cycles when the output voltage exceeds its nominal value. In PWM mode, a PWM signal having a variable duty cycle controls the switching device. A constant output voltage is maintained by feedback circuitry which alters the duty cycle of the PWM signal according to fluctuations in the output voltage.

REFERENCES:
patent: 4047083 (1977-09-01), Plunkett
patent: 4400767 (1983-08-01), Fenter
patent: 4456872 (1984-06-01), Froeschle
patent: 4626763 (1986-12-01), Edwards
patent: 5481178 (1996-01-01), Wilcox et al.

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