Patent ID: 9225241
Filing Date: 2015-12-29
Classification: H02M

Abstract:
1. A pulse width modulation DC-DC converter comprising: a switching unit including a charge switch and a discharge switch which are reversely turned on and off, an inductor that stores charged energy, and a capacitor that stores discharged energy, the switching unit configured to convert an input voltage into an output voltage; a PID controller including an error amplifier, the PID controller configured to compare the output voltage input to the error amplifier with a previously determined reference voltage and produce a PID control voltage; a comparator configured to compare the PID control voltage with a ramp voltage and produce a switching control voltage; a switching controller configured to produce a switching control signal based on the switching control voltage, supply the switching control signal to the switching unit, turn on the charge switch and at the same time turn off the discharge switch in an on-period of the switching control voltage, and turn off the charge switch and at the same time turn on the discharge switch in an off-period of the switching control voltage; and an operating point compensation unit configured to operate in response to an operating point compensation signal and supply an initialization voltage of a uniform level to a node Na, to which the PID control voltage is output, only during an initial drive period, the operating point compensation unit comprising