Voltage conversion device

Details Voltage conversion device Voltage conversion device

2005-02-09

2008-05-27

Laxton, Gary L (Department: 2838)

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

C363S037000

Reexamination Certificate

active

07379313

ABSTRACT:
A control device (30) calculates an upper limit value of a duty ratio (DR_Ulim) according to a voltage (Vm) from a voltage sensor (13) and a threshold voltage (OVb) when an overvoltage is determined to have been applied to a battery (B), and determines a duty ratio (DR) for providing switching control to NPN transistors (Q1, Q2) in a range lower than the calculated upper limit value of the duty ratio (DR_Ulim). The control device (30) uses the determined duty ratio (DR) to provide switching control to the NPN transistors (Q1, Q2). Then, an up-convener (12) converts a direct current voltage (Vb) from the battery (B) into the output voltage (Vm) such that an overvoltage is not applied to the battery (B).

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