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

1994-09-15

1998-02-24

Nguyen, Matthew V.

Electricity: power supply or regulation systems

In shunt with source or load

Using a three or more terminal semiconductive device

323222, G05F 1613

Patent

active

057214832

ABSTRACT:
A DC--DC converter capable of both step-up and step-down operations includes a synchronous rectifier coupled between a rectifier connection and an output node, an inductor coupled between an input node and the rectifier connection, a rectifier control circuit for controlling the synchronous rectifier, the rectifier control circuit coupled to the input node, to the synchronous rectifier, to the rectifier connection and to the output node, and a switch coupled between the rectifier connection and ground. After closing the switch to build up energy in the inductor, the synchronous rectifier turns on simultaneously with the opening of the switch when the voltage of the rectifier connection is greater than the voltage of the output node and the voltage of the input node. The synchronous rectifier turns off when a current through the inductor becomes zero or when the switch closes again. Also, the synchronous rectifier is off when the circuit is in a shut-down mode to conserve power or when the voltage of the rectifier connection does not exceed the voltage of the input or output node. A Miller capacitor is provided to maintain frequency stability.

REFERENCES:
patent: 4617812 (1986-10-01), Kawakami
patent: 5255174 (1993-10-01), Murugan
patent: 5528125 (1996-06-01), Marshall et al.
Lee, Mitchell, "Get +5V/100 mA From Four Cells," Electronic Design, Jan. 9, 1992, p. 132.
Kassakian, John G., Schlecht, Martin F. and Verghese, George C., Principles of Power Electronics (1991), Addison-Wesley Publishing Co., Inc., pp. 103-135, 268-269.
Severns, Rudolf P. and Bloom, Gordon, Modern DC-to-DC Switchmode Power Converter Circuits, (1985), Van Nostrand Reinhold Co., Inc., pp. 51-77.

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