Voltage conversion device and voltage conversion method
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United States of America Patent
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May 7, 2019
Grant Date -
Jan 18, 2018
app pub date -
Jan 25, 2016
filing date -
Jan 27, 2015
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Abstract
A voltage conversion device and a voltage conversion method are provided in which, even immediately after switching a switching frequency, it is possible to suppress fluctuation of output voltage and possible to output a constant voltage in a stable manner. When switching the switching frequency from a first frequency to a second frequency, a duty ratio is changed in a first cycle of a PWM signal immediately after switching so as to be smaller than the duty ratio before switching. The amount of change in this case is set such that a lower limit value of inductor current immediately after switching the switching frequency matches the lower limit value in a steady state. With this sort of change, an increase in the inductor current immediately after switching is suppressed, fluctuation of the output voltage is suppressed, and a stable constant voltage is outputted to a load.
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