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Hitachi Appliances Inc patents


Recent patent applications related to Hitachi Appliances Inc. Hitachi Appliances Inc is listed as an Agent/Assignee. Note: Hitachi Appliances Inc may have other listings under different names/spellings. We're not affiliated with Hitachi Appliances Inc, we're just tracking patents.

ARCHIVE: New 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 | Company Directory "H" | Hitachi Appliances Inc-related inventors


Air conditioner

In the control device 12 of the indoor unit 11, a plurality of communication means 14a to 14c having different communication speeds; communication speed recognizing means 18 for recognizing whether or not a communication line 15 from an outdoor unit 10 is connected to any of the communication means, from the communication speed of the control information signal; and communication means confirmation means 18 for confirming the communication means that performs the following communication based on the recognized communication speed, are provided. According to this, it is possible to recognize the communication speed of an input signal without providing a manual changeover switch. ... Hitachi Appliances Inc

Permanent-magnet dynamo-electric machine and compressor using the same

A rotor is formed such that a concave section is formed on the q axis and a gap between the concave section and a tooth of a stator is larger than a gap between an outer circumferential section and the tooth on the d axis. The concave section is formed in a substantially trapezoidal shape and formed such that an opening degree θp2 on an outer circumference side is large with respect to an opening degree θp1 on an inner circumference side. ... Hitachi Appliances Inc

Dc power supply unit and air conditioner using same

A dc power supply unit is provided that allows for improving efficiency and reducing harmonic currents. A dc power supply unit includes: a bridge rectification circuit having diodes and mosfets; a reactor that is arranged between the ac power supply and the bridge rectifier circuit; a smoothing capacitor that is connected to an output side of the bridge rectifier circuit and smoothes a voltage; and a converter control unit that executes, based on predetermined threshold values, a diode rectification control that uses diodes and parasitic diodes of the mosfets, a synchronous rectification control that switches the mosfets in synchronization with a polarity of the voltage of the ac power supply, a partial switching control that repeats partially short-circuiting the reactor multiple times in a half cycle of the ac power supply, or a fast switching control that short-circuits the reactor at a predetermined frequency over a full ac cycle.. ... Hitachi Appliances Inc

Air conditioner and defrosting operation method therefor

A hot gas bypass circuit that connects a discharge side of the compressor and a portion between the heat source side heat exchanger and the expansion valve, an on-off valve that opens and closes a channel of the hot gas bypass circuit, and a control device performing control to select one of hot gas bypass defrosting and reverse cycle defrosting according to a frosting amount on the heat source side heat exchanger and perform defrosting. The control device controls to open the on-off valve of the hot gas bypass circuit such that a part of a refrigerant discharged from the compressor is supplied to the heat source side heat exchanger via the hot gas bypass circuit and, the control device switches switch the four-way valve such that the refrigerant discharged from the compressor is supplied to the heat source side heat exchanger after passing through the four-way valve.. ... Hitachi Appliances Inc








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