Patent ID: 8446742
Filing Date: 2013-05-21
Classification: H02M,Y02B

Abstract:
1. An inverter control circuit that generates and outputs PWM signals for controlling an operation of a plurality of switching devices in a three-phase inverter circuit, wherein the PWM signals are configured to ensure that a waveform of a phase voltage outputted from the three-phase inverter circuit through a low-pass filter is zero in a first one-third period of a cycle, is a sine wave corresponding to a phase from 0 to 2π/3 in a subsequent one-third period of the cycle; and is a sine wave corresponding to a phase from π/3 to π in a remaining one-third period of the cycle, the inverter control circuit comprising: a target value signal generator that generates a first target value signal, a second target value signal and a third target value signal, the first target value signal having a waveform which is zero in the first one-third period of the cycle, is a sine wave corresponding to a phase from 0 to 2π/3 in the subsequent second one-third period of the cycle, and is a sine wave corresponding to a phase from π/3 to π in the remaining one-third period of the cycle, the second target value signal having a phase advanced by 2π/3 from the first target value signal, the third target value signal having a phase delayed 2π/3 from the first target value signal; and a PWM signal generator that generates the PWM signals based on the target value signals; wherein the target value signal generator includes: a phase voltage control signal generator that generates three phase voltage control signals for controlling the three-phase voltage outputted from the three-phase inverter circuit; a control signal converter that converts the three phase voltage control signals into the line voltage control signal; and a signal generator that generates the first to the third target value signals for the respective phases of the three-phase inverter circuit, based on the line voltage control signal.