Sanyo Electric Co., Ltd.

Yuichi Izawa

Tetsuo Nomoto

Hideaki Kato

Takashi Ogawa

Yasuhiro Makino

Kazuhisa Otagaki

Takahisa Matsuo

A controlling device of a compressor is provided. A noise filter is arranged at an input of the inverter circuit that converts the commercial frequency to a driving frequency to control a motor driving a compressor mechanism, for suppressing a common mode noise of the commercial power source and the inverter circuit, and is connected to a ground through a metal frame used for receiving a compressor main body. The noise filter comprises coils connected between first capacitors and second capacitors that are connected in series between the AC power lines, and further comprises a clamper connected between nodes of the second capacitors and the metal frame for clamping a voltage and a third capacitor connected to the clamper in parallel. even though the new refrigerant, such as R410A, and the three-phase AC power source are used, the leakage current can be reduced by a simple structure and the increase of the noise terminal voltage can be also suppressed. Furthermore, both of the legal regulation requirements can be met.

Controlling device of compressor

An apparatus for protecting an inverter against over current is constructed of a plurality of switching devices connected between the positive and negative terminals of a DC power source. The apparatus has a plurality of detecting devices that convert the currents passing through the plurality of switching devices into voltages and generate detection outputs, a plurality of amplifier circuits, a plurality of comparing devices that supply the detection outputs of the detecting devices to the amplifier circuits and generate an abnormality output if an absolute value of a detection output exceeds a predetermined value, and a protecting device that interrupts the drive of all switching devices if any of the comparing devices issues an abnormality output.

Inverter protecting apparatus

Growing community of inventors

Gunma-ken, Japan

Yuichi Izawa