Patent ID: 8514600
Filing Date: 2013-08-20
Classification: H02M

Abstract:
1. A power conversion apparatus comprising: a current sensor that detects a phase current flowing through a phase current line; a first phase-voltage detection unit that detects a first phase voltage in the phase current line with a potential in a P line as a reference; a second phase-voltage detection unit that detects a second phase voltage in the phase current line with a potential in an N line as a reference; an estimation unit that estimates a zero-cross point timing of a phase current flowing through the phase current line based on a magnitude and a symbol of the first phase voltage and a magnitude and a symbol of the second phase voltage; a calculation unit that obtains a correction value with respect to a detection value of the current sensor according to a detection value of the current sensor at the estimated zero-cross point timing; and a correction unit that corrects a detection value of the current sensor by using the obtained correction value.