Patent application number | Description | Published |
20140338379 | HEAT PUMP DEVICE, AND AIR CONDITIONER, HEAT PUMP WATER HEATER, REFRIGERATOR AND FREEZING MACHINE INCLUDING HEAT PUMP DEVICE - A heat pump device includes an inverter control unit for controlling an inverter. The inverter control unit includes a constraint-energization control unit that, during operation standby of a compressor, determines whether heating to the compressor is necessary, on the basis of a coolant sleeping amount in the compressor, and, when having determined that heating to the compressor is necessary, selects, according to the coolant sleeping amount, any one of direct-current energization for supplying a direct-current voltage to the motor and high-frequency energization for supplying a high-frequency voltage having a frequency higher than a frequency during a normal operation to the motor, so as to output a constraint energization command for carrying out constraint energization of the motor; and a driving-signal generating unit that generates a driving signal on the basis of the constraint energization command. | 11-20-2014 |
20140338380 | HEAT PUMP DEVICE, AIR CONDITIONER, AND FREEZER - The present invention is a heat pump device that includes a compressor including a compression mechanism and a motor, a heat exchanger, an inverter, and an inverter control unit including a drive-signal generation unit generating a drive signal for the inverter and a heating-operation-mode control unit controlling the drive-signal generation unit when the compressor is heated by applying, to the motor, a high-frequency voltage with which the motor cannot be rotationally driven, wherein the heating-operation-mode control unit includes a magnetic-pole-position estimation unit estimating a magnetic pole position indicating a stop position of a rotor of the motor, and a high-frequency energization unit determining an amplitude and a phase of a voltage command based on an estimation result of the magnetic pole position and a necessary amount of heat, notifies the drive-signal generation unit of determined amplitude and phase, and causes the drive-signal generation unit to generate a drive signal. | 11-20-2014 |
20150089972 | HEAT PUMP DEVICE, AIR CONDITIONER, AND FREEZER - A heat pump device includes a compressor including a compression mechanism that compresses a refrigerant and a motor that drives the compression mechanism, an inverter that applies a voltage for driving the motor, a converter that applies a voltage to the inverter, an inverter control unit that generates a driving signal for driving the inverter, and a converter control unit that generates a driving signal for driving the converter, wherein the inverter control unit includes a heating operation mode in which a heating operation of the compressor is performed and a normal operation mode in which a refrigerant is compressed by performing a normal operation of the compressor and the converter control unit sets, in the heating operation mode of the inverter control unit, a voltage applied to the inverter on the basis of a voltage command value for the motor. | 04-02-2015 |
20150096320 | HEAT PUMP DEVICE, AIR CONDITIONER, AND FREEZER - A heat pump device includes: a compressor including a compression mechanism compressing a refrigerant and a motor driving the compression mechanism; an inverter unit applying a voltage for driving the motor; an inverter control unit generating a driving signal for driving the inverter unit; and temperature sensors detecting temperatures of the compressor, wherein the inverter control unit includes a normal operation mode in which a refrigerant is compressed by performing a normal operation of the compressor and a heating operation mode in which a heating operation of the compressor is performed by applying, to the motor, a high-frequency voltage, and in the heating operation mode, the inverter control unit determines an amplitude and a phase of a voltage command for generating the high-frequency voltage on a basis of a temperatures detected by the temperature sensors and a necessary amount of heat specified in advance. | 04-09-2015 |
20150280603 | POWER CONVERSION APPARATUS AND AIR-CONDITIONING APPARATUS USING THE SAME - A power conversion apparatus includes: a first smoothing capacitor and a second smoothing capacitor connected in parallel to each other, an inrush current preventing circuit connected in series to the first smoothing capacitor, the inrush current preventing circuit including an inrush preventing resistor for suppressing an inrush current and a first relay connected in parallel to the inrush preventing resistor; a second relay connected in series to the second smoothing capacitor; an inverter circuit for converting the output smoothed by the first smoothing capacitor and the second smoothing capacitor into an AC voltage and outputting the AC voltage to a load; and relay controlling means for controlling a switching operation of the first relay and the second relay. | 10-01-2015 |
20150381062 | POWER CONVERSION APPARATUS AND REFRIGERATION AIR-CONDITIONING APPARATUS - Provided is a power converter for converting electric power between a power source and a load, including: a boosting device including a boost rectifier configured to prevent a backflow of a current from the load side to the power source side, the boosting device being configured to change a voltage of electric power supplied from the power source to a predetermined voltage; a commutation device configured to perform a commutation operation of directing a current flowing through the boosting device to another path; and a controller configured to perform control related to the voltage change of the boosting device and control related to the commutation operation of the commutation device, in which the commutation device is configured to flow, when the commutation device performs the commutation operation, a current generating a voltage causing reverse recovery of the boost rectifier to the commutation device side. | 12-31-2015 |
20160036317 | POWER CONVERSION DEVICE - A power conversion device located between an AC power source and a load includes: a rectifier circuit unit that rectifies a voltage of the AC power source; a smoothing unit that smooths a DC voltage on the load side of the rectifier circuit unit; a short-circuiting unit that short-circuits the AC power source; a step-up reactor—located on the AC power source side of the short-circuiting unit; at least one of a reactor current detecting unit—that detects the current of the step-up reactor and a bus voltage detecting unit that detects an output voltage of the smoothing unit; a counterflow preventing element that prevents a counterflow of the current from the smoothing unit to the AC power source; a switching control unit that outputs a control signal for the short-circuiting unit; and a switching frequency changing unit that changes a frequency of the control signal using a logic operation. | 02-04-2016 |
20160049783 | BACKFLOW PREVENTING DEVICE, POWER CONVERSION DEVICE, AND REFRIGERATION AIR-CONDITIONING APPARATUS - A backflow preventing device includes a backflow preventing element connected between a power source and a load, for preventing a backflow of a current from the load side to the power source side, a commutation device configured to perform a commutation operation of causing a current to flow through an other path connected in parallel to the backflow preventing element, and a controller configured to change a pulse width of a commutation drive signal for controlling the commutation device to perform the commutation operation based on a current flowing through the backflow preventing element, and transmitting the commutation drive signal having the changed pulse width to the commutation device. The controller transmits the pulse to the commutation device only for a necessary time period so that the commutation device performs the commutation operation, to thereby reduce electric power relating to the commutation operation not contributing to the power conversion. | 02-18-2016 |
20160056715 | POWER CONVERSION APPARATUS AND REFRIGERATION AIR-CONDITIONING APPARATUS - A power converter for converting electrical power from a power source to a load, including: a boosting device including a boost rectifier configured to prevent a backflow of a current from the load to the power source, the boosting device being configured to change a voltage of electrical power from the power source to a predetermined voltage; and a commutation device including: a commutation operation device configured to perform a commutation operation of directing a current flowing through the boosting device to an other path; and a commutation rectifier including a plurality of rectifiers and connected in series on the other path, the commutation rectifier being configured to rectify a current relating to commutation, thereby reducing a capacitance component. | 02-25-2016 |
20160079845 | DC POWER-SUPPLY DEVICE AND REFRIGERATION-CYCLE APPLICATION DEVICE INCLUDING THE SAME - 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. | 03-17-2016 |