Patent ID: 7916509
Filing Date: 2011-03-29
Classification: H02M

Abstract:
1. A power source device comprising: an input terminal; a first switching element connected to the input terminal; a second switching element connected to the first switching element; a transformer having a primary coil connected to a connecting node between the first switching element and the second switching element; a low-pass filter including a series body of a coil and a capacitor, which are connected to a secondary coil of the transformer; an output terminal connected to a connecting node between the coil and the capacitor; a comparator having a first input end connected to the output terminal; and an alternating signal generator connected to a second input end of the comparator, wherein an output terminal of the comparator is connected to each control terminal of the first switching element and the second switching element via a temporary amplitude generation permissible section; and wherein the temporary amplitude generation permissible section comprises: wherein the output terminal of the comparator is connected to each clear input terminal of the first flip-flop circuit and the second flip-flop circuit.