Flyback power supply having a VCO controlled switching rate

Details Flyback power supply having a VCO controlled switching rate Flyback power supply having a VCO controlled switching rate

1994-01-04

1995-02-14

Stephan, Steve L.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

H02M 3335

Patent

active

053901010

ABSTRACT:
A DC-DC current-mode controlled flyback switching power supply provides a high efficiency of operation throughout a wide range of input voltages. An error amplifier produces an error signal from the difference between a reference voltage and an output voltage feedback signal. The error signal controls a VCO that sets a latch to enable a power switch to store power in a flyback transformer. A comparator compares the error signal against a current sense feedback signal indicating the current flowing through the power switch. The comparator resets the latch and disables the power switch to transfer the stored energy in the flyback transformer to the output of the power supply. The extended input range of operation is achieved by varying the switching frequency of the DC-DC converter through the use of the VCO to accommodate varying input voltages and loading.

REFERENCES:
patent: 4347559 (1982-08-01), Sturgeon
patent: 4996638 (1991-02-01), Orr
patent: 5029269 (1991-07-01), Elliott et al.

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