Daikin Industries, Ltd.

Dalkin Industries, Ltd.

Sumikazu Matsuno

Toshiyuki Maeda

Tetsuo Nakata

Reiji Kawashima

Morimitsu Sekimoto

Hiroshi Hibino

Takeshi Hikawa

Abdallah Mechi

Kazushi Hisayama

Yuji Fujimoto

Satoshi Ishikawa

Yukio Nishihama

Keisuke Kudou

Fumiaki Yakushiji

Yasutoshi Mizutani

Yuzo Sawada

A bidirectional switch circuit includes two switching elements connected to conduct a current in both directions. The two switching elements are connected in series to each other. Of the two switching elements, the switching element to which a reverse voltage is applied, a voltage of a source of one of the switching elements being higher than a voltage of a drain of the one, is configured to conduct a current from the source to the drain even when an on-drive signal is not being input to a gate terminal of the one.

Bidirectional switch circuit configured to conduct current in reverse direction without applying an on-drive signal and power converter including the same

In a plug-in operation, a first winding which functions as an armature winding for supplying an R-phase current of a three-phase rotary electric machine, a third winding, and a second winding are connected respectively to terminals for supplying R-phase, S-phase, and T-phase currents of a three-phase power source. Thus, the S-phase current and the T-phase current are interchanged as compared with in a normal operation. Thereby, reverse rotation of a field element is intentionally caused. A reverse-rotation prevention mechanism is provided in the field element.

Hybrid electric-power supplying system

A current detector and a voltage detector respectively detect a current value and a voltage value outputted from an engine generator. An operating block determines a weight constant on the basis of the current value and the voltage value, weights the operating time of an engine by using the weight constant, and integrates the weighted operating time to calculate an integral time. A judging block compares the integral time and a reference time, and gives a notification to an indicator when it judges that the integral time exceeds the reference time. Receiving the notification, the indicator makes an external indication. The current detector and the voltage detector can be made of electric circuitry, so that the life of the engine can be predicted at low costs and with high reliability.

Engine life predicting apparatus and refrigerating apparatus

To reduce a leakage current when a motor for driving a compressor is energized, with the compressor unoperated. Setting the carrier frequency of an inverter at a value lower than that used during normal operation to cause phase interruption electrification of the motor.

Method of preheating inverter-driven compressor and device therefor

A trailer refrigeration system comprising: an electricity generator (); an electricity-generator engine () for driving the electricity generator (); a converter () for converting ac electric power generated by the electricity generator () into dc electric power; an inverter () including inverters (), (), () each for converting dc electric power from the converter () into ac electric power; a refrigerant circuit () having an electric compressor () and a fan () including fans (), (), the electric compressor (), the fan (), and the fan () being driven respectively by ac electric power from inverters (), (), (); and a control means () for individually controlling the speed of rotation of the electric compressor (), the fan (), and the fan ().

Trailer refrigeration system

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Shiga, Japan

Sumikazu Matsuno