Patent ID: 9590484
Date: 2017-03-07
CPC Classifications: H02J,H02M,Y02E

Claim:
1. An inverter device, comprising: an inverter circuit, receiving a DC power and converting the DC power into an AC power; a detection unit, detecting a current harmonic component of an AC current of the AC power and generating a current adjustment signal according to the current harmonic component; and a control unit, coupled to the inverter circuit and the detection unit, outputting a pulse width modulation (PWM) signal to control the inverter circuit to convert the DC power into the AC power, controlling the inverter circuit to stop operation near a zero crossing point, and generating an offset current to be superposed to the AC current according to the current adjustment signal, wherein the detection unit further determines whether a current root mean square (RMS) value of the current harmonic component is greater than a predetermined threshold and generates the current adjustment signal according to a ratio of the current RMS value of the current harmonic component to a current RMS value of the AC current if the current RMS value of the current harmonic component is greater than the predetermined threshold.