Dual mode flyback power supply

Details Dual mode flyback power supply Dual mode flyback power supply

1988-09-26

1989-05-30

Wong, Peter S.

Electric power conversion systems

Current conversion

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

363 56, 363 97, H02M 3335

Patent

active

048356697

ABSTRACT:
A dual mode flyback power supply 10 capable of automatically transitioning between operational modes in response to changes in the impedance of a load 12 connected thereto. The dual mode power supply 10 of the present invention includes an input voltage source 15 for providing input voltage and current. The power supply 10 also includes a first transformer 20 having primary N1, secondary N2 and tertiary N3 windings for supplying a first current to a load 12 operatively coupled to the secondary winding N2. The primary winding N1 is coupled to the input voltage source 15. A feedback circuit 50 provides a first signal in response to the current through the load 12 and a second signal in response to the load voltage exceeding a threshold voltage. The power supply 10 of the present invention further includes a switch 30 for controlling the input current through the primary winding N1 of the first transformer 20 in response to the first and second signals. A second transformer 25 having a primary winding operatively coupled to the tertiary winding N3 of the first transformer 20 supplies a second current to the load 12 in response to the current through the tertiary winding N3.

REFERENCES:
patent: 3740639 (1973-06-01), Easter
patent: 3935526 (1976-01-01), Kamata et al.
patent: 4374355 (1983-02-01), Steigerwald et al.
patent: 4481565 (1984-11-01), Colton
patent: 4562523 (1985-12-01), Rodel et al.
patent: 4665473 (1987-05-01), Onda et al.
patent: 4734839 (1988-03-01), Barthold

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