Multiple output DC-to-DC converter having enhanced noise margin

Details Multiple output DC-to-DC converter having enhanced noise margin Multiple output DC-to-DC converter having enhanced noise margin

1997-11-20

2000-05-02

Tso, Edward H.

Electric power conversion systems

Current conversion

Having plural converters for single conversion

363 71, 323268, 323271, 323285, G05F 140, G05F 144, H02M 700

Patent

active

060580305

ABSTRACT:
A circuit includes a plurality of DC-to-DC converter circuits and separates in time switching of the respective power switches of the DC-to-DC converter circuits which would otherwise be switching at nearly a same time, such as based upon a same desired output level. The switching time may be separated by inverting a periodic control waveform of at least one of the DC-to-DC converter circuits. The multiple output DC-to-DC converter circuit thereby provides an increased noise margin and operates with greater accuracy and stability. The circuit may also determine when the DC-to-DC converter circuits would otherwise be switching at nearly the same time, and activate the switching time separation responsive thereto. For example, the determination may be made based upon a selectable output level being within a predetermined range of at least one other output level. The circuit in accordance with the invention is particularly advantageous for a single integrated circuit implementation, and may be used, for example, on a portable computer motherboard.

REFERENCES:
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patent: 4313155 (1982-01-01), Bock et al.
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patent: 5479335 (1995-12-01), Saito et al.
patent: 5521809 (1996-05-01), Ashley et al.
patent: 5550729 (1996-08-01), Wissell
patent: 5793191 (1998-08-01), Elmore et al.
patent: 5804950 (1998-09-01), Hwang et al.

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