Switching power supplies with linear precharge, pseudo-buck and

Details Switching power supplies with linear precharge, pseudo-buck and Switching power supplies with linear precharge, pseudo-buck and

1998-05-27

1999-12-07

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

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

323908, 323276, 363 50, G05F 140, G05F 1569, H02H 710

Patent

active

059989777

ABSTRACT:
The present invention teaches a variety of startup modes for operating a boost type switching power supply. A linear charging mode couples the input voltage directly to the output voltage, thereby precharging the output capacitor of the switching power supply. The linear mode serves to reduce inrush battery current and limit the stress voltage on the power switching devices. A pseudo-buck mode, preferably entered into after the linear mode has precharged the output capacitor, operates the boost type switching power supply in a manner providing power to the output essentially as a buck type switching power supply would. This results in continuous charging of the output capacitor, thereby reducing startup time and increasing power efficiency. The pseudo-buck mode also enables step-down voltage generation with boost type circuitry. A pseudo-boost mode facilitates a smooth transition between the pseudo-buck and traditional boost modes. The power devices are operated in the pseudo-buck mode such that control over the inductor current is maintained to minimize inrush current.

REFERENCES:
patent: 3984799 (1976-10-01), Fletcher
patent: 4578630 (1986-03-01), Grosch
patent: 5144222 (1992-09-01), Herbert
patent: 5313382 (1994-05-01), Farrington
patent: 5402060 (1995-03-01), Erisman
patent: 5565761 (1996-10-01), Hwang
patent: 5602463 (1997-02-01), Bendall et al.
patent: 5736842 (1998-04-01), Jovanovic
patent: 5856919 (1999-01-01), Moriaty, Jr.
Maxim Product Data Sheet 19-0382; Rev. 1; Aug. 1995; "Dual-Output, 1MHz DC-DC Boost Converter for PCMCIA Applications".

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