Patent ID: 8120337
Filing Date: 2012-02-21
Classification: H02M,H05B

Abstract:
1. A load driver for driving a load, the load driver comprising: an inverter, configured to convert an input voltage into a driving voltage of the load using at least one first switch for switching according to a duty ratio; a capacitor, configured to be charged and discharged by a current corresponding to a difference between a feedback voltage corresponding to a current flow to the load and a reference voltage; and an inverter driver, configured to control the duty ratio using a first control signal having a waveform that is repeated with a first frequency and a voltage of the capacitor, and to set the voltage of the capacitor as a voltage corresponding to the first control signal during a soft start period; wherein the inverter driver comprises: a second switch having a first terminal connected to a non-grounded terminal of the capacitor; a logic device, configured to turn on the second switch in response to a soft start signal during the soft start period; and a limiter connected to a second terminal of the second switch, and configured to set the voltage of the capacitor as a voltage corresponding to the first control signal when the second switch is turned on.