RESONANCE-TYPE POWER CONVERTER CIRCUIT PROVIDED WITH RESONANCE CIRCUIT INCLUDING LC RESONANCE CIRCUIT AND SWITCHING ELEMENT

Provided is a resonance-type power conversion circuit and the like greatly reducing computation cost with a simple configuration. The resonance-type power conversion circuit according to the present invention comprises: a resonance circuit which includes a first LC resonance circuit and a switching element and which outputs an output voltage or an output current to a load; a detection circuit which detects output information being the output voltage or the output current: a computation control unit which searches, on the basis of the detected output information, for a local maximum point in a characteristic of the output information with respect to an operating frequency and which determines the operating frequency corresponding to the searched local maximum point; and a signal generation unit which generates a drive control signal having the determined operating frequency and which applies frequency control to the switching element on the basis of the drive control signal. The resonance circuit feeds back the drive control signal which has the characteristic of the output information with respect to the operating frequency corresponding to the local maximum point and having a load independent point that does not depend on the load and which includes the output information to the switching element to drive at the load independent point by the frequency control based on the drive control signal.