Patent ID: 8879281
Filing Date: 2014-11-04
Classification: H02M

Abstract:
1. A switching power source device comprising: a resonance-type switching power source device main body which includes first and second switching elements that are connected in series and are alternately controlled to switch ON and OFF, and in which the first switching element switches an input voltage to accumulate electric power in an inductor, the second switching element is switched to transfer the electric power accumulated in the inductor to an output capacitor using resonance of the inductor to obtain output electric power; a dead time adjustment circuit that generates an ON trigger signal that regulates an ON timing of one of the first and second switching elements after elapse of a predetermined dead time from an OFF timing of the other switching element, and the dead time adjustment circuit adjusts the dead time according to a temporal change of a terminal voltage input to an input terminal for detecting a change in a connection point voltage of the first and second switching elements; and a disable control circuit that detects the temporal change of the terminal voltage during activation and disables a function of the dead time adjustment circuit adjusting the dead time when the terminal voltage does not temporally change.