Voltage step-up circuit and method for controlling the same

Details Voltage step-up circuit and method for controlling the same Voltage step-up circuit and method for controlling the same

1998-06-30

1999-09-28

Berhane, Adolf Deneke

Electric power conversion systems

Current conversion

With voltage multiplication means

327536, H02M 318

Patent

active

059598549

ABSTRACT:
A voltage step-up circuit includes a voltage detecting circuit for generating a discriminating signal when a stepped-up voltage is lower than a previously set value, an oscillating circuit responding to the discriminating signal to oscillate to generate an oscillation signal, a plurality of control circuits receiving the discriminating signal and the oscillation signal in a phase different from one control circuit to another, and a plurality of charge pump circuits independently controlled by the plurality of control circuits, respectively. Each of the control circuits includes a latch circuit for storing a logical condition of an output from each control circuit to a corresponding charge pump circuit when the corresponding charge pump circuit stopped its charge pump operation, a first path receiving the oscillation signal for outputting the oscillation signal as its is to the corresponding charge pump circuit, and a second path receiving the oscillation signal and having an inverter for outputting an inverted signal of the oscillation signal to the corresponding charge pump circuit. the first path and the second path are controlled by the latch circuit to alternatively activated to supply a logical condition opposite to the stored logical condition, to the corresponding charge pump circuit, when the corresponding charge pump circuit restarts its charge pump operation.

REFERENCES:
patent: 5216588 (1993-06-01), Bajwa et al.
patent: 5561385 (1996-10-01), Choi
patent: 5627739 (1997-05-01), Yung-Chow et al.
patent: 5629843 (1997-05-01), Loughmiller et al.
patent: 5687128 (1997-11-01), Lee et al.
patent: 5767735 (1998-06-01), Javanifard et al.
patent: 5801934 (1998-09-01), Lacey et al.

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