Method and apparatus for enabling a step-up or step-down operati

Details Method and apparatus for enabling a step-up or step-down operati Method and apparatus for enabling a step-up or step-down operati

1997-10-02

1999-05-18

Nguyen, Matthew

Electricity: power supply or regulation systems

In shunt with source or load

Using a three or more terminal semiconductive device

G05F1/613

Patent

active

059053682

ABSTRACT:
A circuit for controllably coupling an input to an output. The circuit includes: (1) a pass transistor having an emitter, a collector and a base, the emitter being coupled to the input, the collector being coupled to the output; (2) a second transistor coupled to the pass transistor, and biased to operate with a collector-to-base voltage approximately equal to zero; and (3) a control circuit coupled to the input, the output and the base of the pass transistor, the control circuit controllably turning the pass transistor on. When the pass transistor is turned on, the control circuit maintains in the pass transistor a collector current approximately equal to a predetermined scale factor times the collector current of the second transistor. The predetermined scale factor ensures that the pass transistor operates at the edge of a saturation region when the pass transistor is turned on.

REFERENCES:
patent: 4618812 (1986-10-01), Kawakami
patent: 5255174 (1993-10-01), Murugan
patent: 5394078 (1995-02-01), Brokaw
patent: 5446414 (1995-08-01), Kolluri
patent: 5742155 (1998-04-01), Susak et al.
"Modern DC-To-DC Switchmode Power Converter Circuits", Rudolf P. Severns et al., Van Nostrand Reinhold Company (1985), pp. 51-77.
"Principles of Power Electronics", John G. Kassakain et al., Addison-Wesley Publishing Company (1991), pp. 103-135,268-269.
"Get +5V/100 MA From Your Cells", Mitchell Lee, Electronic Design, Jan. 1992.

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