Mitsubishi Electric Corporation

Shingo Taninaka

Naofumi Takenaka

Kazunori Sakanobe

Shigeo Takata

Toshiki Betsuin

A direct-current power supply apparatus includes a rectifier circuit that rectifies a power-supply voltage output from an alternating-current power supply, a smoothing capacitor that smooths an output voltage of the rectifier circuit and outputs a direct-current voltage, a switch connected between an output side of the rectifier circuit and an input side of the smoothing capacitor, a zero crossing detector that detects a zero crossing point of the power-supply voltage, and a controller. The controller includes an adjustment circuitry that sets a switching period such that timing of an on switching operation of the switch falls between a zero crossing period that is a period for the zero crossing point detected by the zero crossing detector, and a zero crossing average period, and a switch control circuitry that outputs an on signal to the switch in accordance with the switching period set by the adjustment circuitry.

Direct-current power supply apparatus and method of controlling the same

An exhaust heat recovery type of air-conditioning apparatus includes: an air-conditioning-side refrigerant circuit including a first flow switching device, a second flow switching device, and an exhaust-heat recovery heat exchanger connected in parallel to an outdoor heat exchanger and an indoor heat exchanger; and a refrigeration-side refrigerant circuit. The first flow switching device causes the outdoor heat exchanger to communicate with one of a discharge side and a suction side of a first compressor through a pipe. The second flow switching device causes the indoor heat exchanger to communicate with one of the discharge and suction sides of the first compressor through a pipe. The exhaust-heat recovery heat exchanger is connected to the suction side of the first compressor through a pipe, and causes heat exchange between refrigerants. Because of the above configuration, the exhaust heat recovery type of air-conditioning apparatus can use exhaust heat in any of operation modes.

Growing community of inventors

Tokyo, Japan

Shingo Taninaka