Flyback converter with limited output power

Details Flyback converter with limited output power Flyback converter with limited output power

1999-01-22

2000-03-28

Berhane, Adolf Deneke

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 21, H02M 3335

Patent

active

060440023

ABSTRACT:
A flyback converter based on a switcher IC with Pulse Width Modulation control of the switching transistor. The pulse width is controlled by changing the input current at the control input. Under normal operating conditions the voltage at the control input is maintained at a fixed level, which voltage also serves as a supply voltage for the control unit. A charge pump provides extra charge for the smoothing capacitor at the control input when the load would cause the voltage across the smoothing capacitor to collapse below the fixed level, thereby preventing the control unit from entering the auto-restart mode of the switcher IC. In this way the flyback converter can be used as a constant power source for charging rechargeable batteries with a working voltage lower than the nominal operating output voltage of the converter.

REFERENCES:
patent: 4887199 (1989-12-01), Whittle
patent: 5117157 (1992-05-01), Vos
patent: 5122945 (1992-06-01), Marawi
patent: 5694025 (1997-12-01), Oglesbee et al.
patent: 5734563 (1998-03-01), Shinada
patent: 5831837 (1998-11-01), Coyne et al.
"TOP210" Power Integrations, Inc., pp. 2-32 through 2-45, Jul. 1996.

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