POWER CONVERSION DEVICE AND AIR-CONDITIONING APPARATUS

摘要

A power conversion device includes: a rectifier, a converter unit including a reactor, a backflow prevention element, and a switching element, the converter unit being configured to boost a DC voltage rectified by the rectifier, a smoothing capacitor, a reactor current detection unit, a bus voltage detection unit, a temperature detection unit, and a control unit. The control unit includes a converter control unit configured to calculate a switching command value for driving the switching element, on the basis of a target command voltage which is the bus voltage to be targeted, the bus voltage detected by the bus voltage detection unit, and the reactor current detected by the reactor current detection unit, and a temperature correction unit configured to correct the temperature of the switching element detected by the temperature detection unit, on the basis of the switching command value calculated by the converter control unit.

主权项

1. A power conversion device comprising:
a rectifier configured to rectify an input voltage supplied from an AC power supply; a converter including a reactor connected to an output end of the rectifier, a backflow prevention element connected in series to the reactor, and a switching element connected between the reactor and the backflow prevention element, the converter being configured to boost a DC voltage rectified by the rectifier; a smoothing capacitor configured to smooth a bus voltage outputted from the converter; a reactor current detector configured to detect a reactor current flowing through the reactor; a bus voltage detector configured to detect the bus voltage; a temperature detector configured to detect a temperature of the switching element;
a converter control unit configured to calculate a switching command value for driving the switching element, on a basis of a target command voltage which is the bus voltage to be targeted, the bus voltage detected by the bus voltage detector, and the reactor current detected by the reactor current detector; anda temperature correction unit configured to correct the temperature of the switching element detected by the temperature detector, on a basis of the switching command value calculated by the converter control unit.