Abstract: A DC power-supply device that suppresses an excessive inrush current, can prevent breakage of elements and burnout of circuits, and converts alternating current from a three-phase AC power supply into direct current to supply it to a load, includes a rectifier circuit having a reactor connected to input or output side thereof and rectifying the alternating current from the three-phase AC power supply; first and second capacitors and connected in series between output terminals to the load; a charging unit selectively charges one or both of the first and second capacitors; and a control unit controlling the charging unit. When charging of the first and second capacitors is started, the control unit reduces the on-duty ratio, and then, until the on-duty ratio during a normal operation is reached, the control unit executes control such that the on-duty ratio is gradually increased as a predetermined time period is passed.

Abstract: A DC power-supply device that suppresses an increase of a harmonic current and deterioration of a power factor without causing any imbalance among respective phase currents, in a configuration in which a three-phase alternating current is converted into a direct current and supplied to a load. The DC power-supply device includes a rectifier circuit, a reactor connected to an input side or an output side of the rectifier circuit, a first capacitor and a second capacitor serially connected between output terminals to a load, and a charging unit. During a cycle combining a charging period and a non-charging period of a pair of the first capacitor and the second capacitor, the charging unit is controlled so that a charging frequency becomes 3n times (n is a natural number) the frequency of the three-phase alternating current.

Abstract: A vehicle air conditioning control device calculates, through a thermal load calculating unit, a vehicle interior thermal load Q on the basis of, for example, a vehicle interior temperature Tin, a vehicle interior humidity Hin, a vehicle exterior temperature Tout, a passenger load factor ?, and a vehicle-interior-temperature set value Tset. Through an air conditioning output calculating unit, the vehicle air conditioning control device calculates an output command value for an air conditioner on the basis of a vehicle-interior-temperature upper-limit value Tmax, a vehicle-interior-temperature lower-limit value Tmin, the thermal load Q, power-running/regenerative electric power P, and then, corrects the calculated output command value for the air conditioner on the basis of power-running/regenerative electric power Pf at or after a prediction time point and of a passenger load factor ?f at or after the prediction time point.

Abstract: A DC power-supply device that suppresses an excessive inrush current, can prevent breakage of elements and burnout of circuits, and converts alternating current from a three-phase AC power supply into direct current to supply it to a load, includes a rectifier circuit having a reactor connected to input or output side thereof and rectifying the alternating current from the three-phase AC power supply; first and second capacitors and connected in series between output terminals to the load; a charging unit selectively charges one or both of the first and second capacitors; and a control unit controlling the charging unit. When charging of the first and second capacitors is started, the control unit reduces the on-duty ratio, and then, until the on-duty ratio during a normal operation is reached, the control unit executes control such that the on-duty ratio is gradually increased as a predetermined time period is passed.

Abstract: A DC power-supply device that suppresses an increase of a harmonic current and deterioration of a power factor without causing any imbalance among respective phase currents, in a configuration in which a three-phase alternating current is converted into a direct current and supplied to a load. The DC power-supply device includes a rectifier circuit, a reactor connected to an input side or an output side of the rectifier circuit, a first capacitor and a second capacitor serially connected between output terminals to a load, and a charging unit. During a cycle combining a charging period and a non-charging period of a pair of the first capacitor and the second capacitor, the charging unit is controlled so that a charging frequency becomes 3n times (n is a natural number) the frequency of the three-phase alternating current.

Abstract: A vehicle air conditioning control device calculates, through a thermal load calculating unit, a vehicle interior thermal load Q on the basis of, for example, a vehicle interior temperature Tin, a vehicle interior humidity Hin, a vehicle exterior temperature Tout, a passenger load factor ?, and a vehicle-interior-temperature set value Tset. Through an air conditioning output calculating unit, the vehicle air conditioning control device calculates an output command value for an air conditioner on the basis of a vehicle-interior-temperature upper-limit value Tmax, a vehicle-interior-temperature lower-limit value Tmin, the thermal load Q, power-running/regenerative electric power P, and then, corrects the calculated output command value for the air conditioner on the basis of power-running/regenerative electric power Pf at or after a prediction time point and of a passenger load factor Of at or after the prediction time point.

Abstract: A first air-conditioning apparatus disposed in a frame mounted on a vehicle is updated to a second air-conditioning apparatus is disposed in the frame. A compressor, an outdoor heat exchanger, pressure reducing means, and an indoor heat exchanger of the first air-conditioning apparatus are removed from the frame. The second air-conditioning apparatus is assembled such that a compressor, an outdoor heat exchanger, pressure reducing means, and an indoor heat exchanger are arranged at predetermined positions in the frame, and the second air-conditioning apparatus is charged with HFC refrigerant. An inverter driving the compressor controls the compressor on the basis of a measured value of at least one of a pressure sensor and an outside air temperature sensor arranged on a discharge side of the compressor such that the amount of refrigerant circulating in the second air-conditioning apparatus is larger than that in the first air-conditioning apparatus.

Abstract: To propose a vehicle air-conditioning system capable of further reducing a temperature fluctuation of blowing-out air when temperature-conditioned air is supplied to an in-car space. The vehicle air-conditioning system including a cooling apparatus 5 capable of changing an amount of withdrawn heat in a stepwise manner, heaters 6A, 6B, and 6C, each having different heat release capability, which constitutes a heating apparatus 6 capable of changing an amount of generated heat in a stepwise manner, and a control device 30 including a supplying amount of heat calculating portion 30A for calculating a supplying amount of heat to an in-car space 2 and an amount of generated and withdrawn heat setting portion 30B for setting amounts of withdrawn and generated heat of the cooling apparatus 5 and the heating apparatus 6 on the basis of the supplying amount of heat calculated by means of the supplying amount of heat calculating portion 30A.