CONTROL CIRCUIT FOR INVERTER CIRCUIT, INVERTER DEVICE WITH THE CONTROL CIRCUIT, INDUCTION HEATING APPARATUS WITH THE INVERTER DEVICE, AND CONTROL METHOD

摘要

PROBLEM TO BE SOLVED: To provide a control circuit for an inverter circuit in which a duty ratio of a pulse signal inputted to a driver is prevented from exceeding a predetermined value.;SOLUTION: In a control circuit for controlling an inverter circuit by inputting a drive signal to the inverter circuit, output of the inverter circuit is controlled by changing a phase difference θ that is a difference between a phase of a pulse signal Pa to be a basis of a preceding drive signal inputted to a switching element disposed in one arm of the inverter circuit and a phase of a pulse signal Pc to be a basis of a following drive signal inputted to a switching element disposed in the other arm. The phase difference θ is reduced by delaying the phase of the pulse signal Pa by prolonging a low-level period thereof, and the phase difference θ is enlarged by delaying the phase of the pulse signal Pc by prolonging a low-level period thereof. Since the phase difference θ is changed by prolonging the low-level periods of the pulse signals, a duty ratio of the pulse signals is prevented from being enlarged.;COPYRIGHT: (C)2015,JPO&INPIT