Logarithmic power compensation for a switching power supply

Details Logarithmic power compensation for a switching power supply Logarithmic power compensation for a switching power supply

1997-09-23

1998-12-29

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 21, G05F 156

Patent

active

058547428

ABSTRACT:
A current-mode control system for a switching power supply which provides logarithmic compensation to a peak primary current of a variable frequency, fully discontinuous switching power supply. A ramp voltage generator generates a ramp voltage that is furnished to a control circuit. The control circuit compares the voltage level of the ramp signal to the voltage level of a control voltage. The control voltage is provided by an error amplifier and is a function of an output voltage of the converter. The control circuit allows a primary switching current to exist in the converter until the ramp voltage renders the control voltage. The ramp voltage logarithmically compensates the peak of the primary current by adjusting the ramp voltage. This logarithmic compensation provides a relatively constant output power over a large input voltage range.

REFERENCES:
patent: 4616300 (1986-10-01), Santelmann, Jr.
patent: 4672518 (1987-06-01), Murdock
patent: 4866588 (1989-09-01), Rene
patent: 5173847 (1992-12-01), Suzuki
patent: 5680036 (1997-10-01), Faulk

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