Patent ID: 9453860
Filing Date: 2016-09-27
CPC Classification: G01R,H02M

Claim Text:
1. An inverter device that switches an input voltage by using a switching element on which on/off control is performed by a control circuit, flows an excitation current into an excitation winding of a resonance transformer during a period in which the switching element is on, and outputs an alternating current output voltage from an output winding of the resonance transformer during a period in which the switching element is off, the inverter device comprising: a simulation output voltage generation unit that generates a simulation output voltage that corresponds to an instantaneous value of the output voltage and that has a waveform whose peak value is smaller than a peak value of the output voltage; a circuit that generates a peak value detection voltage by rectifying and smoothing the simulation output voltage; and a monitor circuit that compares the peak value detection voltage, or a voltage obtained by dividing the peak value detection voltage, with a reference voltage and transmits a feedback signal according to the result of the comparison to the control circuit, wherein the control circuit changes a duty ratio of a switching signal for performing on/off control on the switching element in accordance with the feedback signal and controls the peak value detection voltage to keep a given value.