Boost circuit capable of step-up ratio control

Details Boost circuit capable of step-up ratio control Boost circuit capable of step-up ratio control

2007-12-04

2007-12-04

Vu, Bao Q. (Department: 2838)

Electric power conversion systems

Current conversion

With voltage multiplication means

C327S536000, C327S108000, C327S111000, C327S112000

Reexamination Certificate

active

11087795

ABSTRACT:
When a step-up ratio control circuit sets a step-up ratio of a charge pump circuit to 1.0 to enable a short mode, a path inside the charge pump circuit is short-circuited and a first transistor is completely turned on. This produces an inrush current derived from a battery voltage of a lithium ion battery flowing into the charge pump circuit. To address this, a constant current circuit is operated so that the first transistor is turned on slowly. Further, the operation of an oscillator and an operational amplifier is suspended when the short mode is enabled.

REFERENCES:
patent: 6504422 (2003-01-01), Rader et al.
patent: 6-78527 (1994-03-01), None
English Abstract for Japanese Patent Application No. 6-78527 dated Mar. 18, 1994.

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