Abstract: A motor drive apparatus includes: inverter modules equivalent in number to phases of a motor; and a control unit that generates a PWM signal for driving the inverter modules by using PWM. Each of the inverter modules includes: a plurality of pairs of switching elements, each pair of switching elements including two switching elements connected in series; a drive circuit; and a protection circuit. The plurality of pairs of switching elements is connected in parallel, and power GNDs that are reference terminals of the plurality of pairs of switching elements, a control GND that is a reference terminal of the drive circuit, and a terminal for overcurrent fault input in the protection circuit are independently exposed to the outside. The power GNDs and the control GND are connected to a single point on a printed circuit board by a wiring pattern.

Abstract: There are provided the same number of inverter modules as the number of phases of a motor, and an inverter control unit that generates PWM signals used to drive the inverter modules in PWM. Three phase outputs from each of the inverter modules are coupled to form a phase output signal for one phase of the motor while capacitors are mounted between control GNDs of the inverter modules and power GNDs of the inverter modules. Consequently, even if a surge voltage is generated in a GND wiring at the time of a switching operation of switching elements in the inverter modules, the application of the surge voltage to the switching elements can be suppressed.

Abstract: An air-conditioning apparatus determines whether or not to permit an air-conditioning operation based on refrigerant amount information stored in an outdoor unit and installation height information stored in an indoor unit.

Abstract: A motor drive apparatus includes: inverter modules equivalent in number to phases of a motor; and a control unit that generates a PWM signal for driving the inverter modules by using PWM. Each of the inverter modules includes: a plurality of pairs of switching elements, each pair of switching elements including two switching elements connected in series; a drive circuit; and a protection circuit. The plurality of pairs of switching elements is connected in parallel, and power GNDs that are reference terminals of the plurality of pairs of switching elements, a control GND that is a reference terminal of the drive circuit, and a terminal for overcurrent fault input in the protection circuit are independently exposed to the outside. The power GNDs and the control GND are connected to a single point on a printed circuit board by a wiring pattern.

Abstract: There are provided the same number of inverter modules as the number of phases of a motor, and an inverter control unit that generates PWM signals used to drive the inverter modules in PWM. Three phase outputs from each of the inverter modules are coupled to form a phase output signal for one phase of the motor while capacitors are mounted between control GNDs of the inverter modules and power GNDs of the inverter modules. Consequently, even if a surge voltage is generated in a GND wiring at the time of a switching operation of switching elements in the inverter modules, the application of the surge voltage to the switching elements can be suppressed.

Abstract: An air conditioner includes an outdoor device and an indoor device. The outdoor device includes an outdoor control unit that is operated at the voltage of a smoothing capacitor; a power-supply switching relay to which a signal line is connected; an inrush-current preventing-relay drive unit that is operated when single-phase AC power is supplied between a power-signal common line and the signal line via an outdoor activation relay in the indoor device and the power-supply switching relay; a first inrush-current preventing relay that is connected in parallel with a power supply relay and is controlled by the inrush-current preventing-relay drive unit; and a second inrush-current preventing relay that is connected in parallel with the first inrush-current preventing relay and is controlled by the outdoor control unit. The outdoor control unit closes the second inrush-current preventing relay when the external power supply is interrupted.

Abstract: There is provided a refrigeration cycle apparatus in which an outdoor heat source unit, an indoor unit, and a water heating unit are connected, and an air conditioning operation and a water heating operation can be performed separately, and an exhaust-heat recovery operation can be performed by simultaneously performing air cooling and water heating. The outdoor heat source unit includes a compressor for compressing refrigerant, a refrigerant air-heat exchanger that performs heat exchange between the refrigerant and outside air, a fan for cooling the refrigerant air-heat exchanger, a control device that includes an inverter device for driving the compressor, and a heat sink for dissipating heat of the inverter device, and a switching element in the inverter device is constituted by an element formed by a wide bandgap semiconductor.

Abstract: An air-conditioning apparatus determines whether or not to permit an air-conditioning operation based on refrigerant amount information stored in an outdoor unit and installation height information stored in an indoor unit.

Abstract: An air conditioner includes an outdoor device and an indoor device. The outdoor device includes an outdoor control unit that is operated at the voltage of a smoothing capacitor; a power-supply switching relay to which a signal line is connected; an inrush-current preventing-relay drive unit that is operated when single-phase AC power is supplied between a power-signal common line and the signal line via an outdoor activation relay in the indoor device and the power-supply switching relay; a first inrush-current preventing relay that is connected in parallel with a power supply relay and is controlled by the inrush-current preventing-relay drive unit; and a second inrush-current preventing relay that is connected in parallel with the first inrush-current preventing relay and is controlled by the outdoor control unit. The outdoor control unit closes the second inrush-current preventing relay when the external power supply is interrupted.

Abstract: A DC power supply apparatus comprising: a rectifying circuit including, a first rectifying portion, a second rectifying portion, a third rectifying portion and a fourth rectifying portion; a current detection portion; a first switching portion; and a second switching portion; wherein each of the first rectifying portion cooperatively operating with the first switching portion and the second rectifying portion cooperatively operating with the second switching portion is a semiconductor element which is formed by using a Schottky junction formed between silicon carbide or gallium nitride and metal and has a withstanding voltage property with respect to a voltage of an AC power supply.

Abstract: [Problem] To provide a power converter capable of suppressing voltage dropping of the smoothing capacitor and suppressing a rush current at the time of power recovery, [Means for Resolution] When it is determined that a bus voltage Vdc detected by a DC voltage detecting unit 24 is equal to or less than a predetermined reference voltage, a control device 20 allows a DC load control unit 23 to stop an operation of a DC load 30.

Abstract: A DC power supply apparatus comprising: a rectifying circuit including, a first rectifying portion, a second rectifying portion, a third rectifying portion and a fourth rectifying portion; a current detection portion; a first switching portion; and a second switching portion; wherein each of the first rectifying portion cooperatively operating with the first switching portion and the second rectifying portion cooperatively operating with the second switching portion is a semiconductor element which is formed by using a Schottky junction formed between silicon carbide or gallium nitride and metal and has a withstanding voltage property with respect to a voltage of an AC power supply.

Abstract: There is provided a refrigeration cycle apparatus in which an outdoor heat source unit, an indoor unit, and a water heating unit are connected, and an air conditioning operation and a water heating operation can be performed separately, and an exhaust-heat recovery operation can be performed by simultaneously performing air cooling and water heating. The outdoor heat source unit includes a compressor for compressing refrigerant, a refrigerant air-heat exchanger that performs heat exchange between the refrigerant and outside air, a fan for cooling the refrigerant air-heat exchanger, a control device that includes an inverter device for driving the compressor, and a heat sink for dissipating heat of the inverter device, and a switching element in the inverter device is constituted by an element formed by a wide bandgap semiconductor.

Abstract: [Problem] To provide a power converter capable of suppressing voltage dropping of the smoothing capacitor and suppressing a rush current at the time of power recovery, [Means for Resolution] When it is determined that a bus voltage Vdc detected by a DC voltage detecting unit 24 is equal to or less than a predetermined reference voltage, a control device 20 allows a DC load control unit 23 to stop an operation of a DC load 30.

Abstract: A DC power supply apparatus comprising: a rectifying circuit including, a first rectifying portion, a second rectifying portion, a third rectifying portion and a fourth rectifying portion; a current detection portion; a first switching portion; and a second switching portion; wherein each of the first rectifying portion cooperatively operating with the first switching portion and the second rectifying portion cooperatively operating with the second switching portion is a semiconductor element which is formed by using a Schottky junction formed between silicon carbide or gallium nitride and metal and has a withstanding voltage property with respect to a voltage of an AC power supply.

Abstract: An adhesive agent is uniformly applied to a back surface of a window pane, the application made to an area where a covering member is planned to be adhered and to an area where a positioning fixture and a holding portion are planned to be adhered, the application is also made continuously such that adhesive agent layers of both planned adhesion areas being continuous with an adhesive agent continuous area in between. After that, the window pane and the positioning fixture are set in an injection mold and a polymer material is injected in the mold. This results that the covering member and the holding portion are formed into a shape where they are connected by a connection portion for material flow, which connection portion is formed at a position other than the adhesive agent continuous area. The forming results that the covering member and the holding portion are adhered and fixed to the back surface of the window pane with the adhesive agent layers in between.

Abstract: A method of manufacturing a composite molded member, which includes the steps of: setting the main body inside an injection mold; closing the injection mold to fix the main body inside the injection mold; and forming the cushion members on the edges of the main body through heat and pressure of the injected elastic polymer material. The elastic polymer material is injected from an injection gate into one of the first and second edges at the back surface side of the main body of the molding cavities to flow the elastic polymer material into one of the molding cavities. The elastic polymer material flows into the other of the molding cavities through the connecting flow path, and fills the molding cavities with the elastic polymer material.

Abstract: A method of manufacturing a composite molded member, which includes the steps of: setting the main body inside an injection mold; closing the injection mold to fix the main body inside the injection mold; and forming the cushion members on the edges of the main body through heat and pressure of the injected elastic polymer material. The elastic polymer material is injected from an injection gate into one of the first and second edges at the back surface side of the main body of the molding cavities to flow the elastic polymer material into one of the molding cavities. The elastic polymer material flows into the other of the molding cavities through the connecting flow path, and fills the molding cavities with the elastic polymer material.

Abstract: An adhesive agent is uniformly applied to a back surface of a window pane, the application made to an area where a covering member is planned to be adhered and to an area where a positioning fixture and a holding portion are planned to be adhered, the application is also made continuously such that adhesive agent layers of both planned adhesion areas being continuous with an adhesive agent continuous area in between. After that, the window pane and the positioning fixture are set in an injection mold and a polymer material is injected in the mold. This results that the covering member and the holding portion are formed into a shape where they are connected by a connection portion for material flow, which connection portion is formed at a position other than the adhesive agent continuous area. The forming results that the covering member and the holding portion are adhered and fixed to the back surface of the window pane with the adhesive agent layers in between.

Abstract: A window assembly has a window pane formed from inorganic glass and a concealing member formed along a peripheral edge of the window pane. The concealing member is bonded to the window pane through an adhesive layer containing an acid-modified polyolefin resin or an acid-modified olefin-styrene copolymer resin as a main component. The concealing member is formed in such a manner that a forming material mainly containing an olefin-based thermoplastic elastomer material or a styrene-based thermoplastic elastomer material is heated and molten, and the molten forming material is brought into pressure contact with the window pane having the adhesive layer formed thereon in advance, and then cooled and solidified.