Patent application number | Description | Published |
20110132899 | CONVERTER CIRCUIT AND MOTOR DRIVE APPARATUS, AIR-CONDITIONER, REFRIGERATOR, AND INDUCTION HEATING COOKER PROVIDED WITH THE CIRCUIT - To obtain a converter circuit capable of being made to be small and light-weighted and reducing switching loss, a motor drive control apparatus, an air-conditioner, a refrigerator, and an induction heating cooker provided with the circuit. | 06-09-2011 |
20120096881 | AIR-CONDITIONING APPARATUS - The air-conditioning apparatus includes a coolant circuit configured by sequentially connecting a compressor, an indoor heat exchanger, an expansion valve, and an outdoor heat exchanger; a motor that operates a compressor mechanism disposed inside the compressor; an inverter for driving the motor; and a control unit that controls the inverter. The control unit includes a liquefaction detecting unit that detects coolant liquefaction in the compressor; includes a first PWM signal generating unit that generates an inverter control signal for driving the motor; includes a second PWM signal generating unit that generates an inverter control signal for making the motor perform a preheating operation; and includes a switching unit that performs switching in such a way that the first PWM signal generating unit or the second PWM signal generating unit outputs the corresponding inverter control signal to the inverter. | 04-26-2012 |
20120111043 | AIR-CONDITIONING APPARATUS - In order to be able to comply itself to the environment-conscious design standard, a refrigerant heating method is obtained with high efficiency during standby and reduction of vibrations and noises of a bearing in a compressor. A compressor, a motor to drive the compressor, an inverter to apply a desired voltage to the motor, an inverter control means to control the inverter, and a bus voltage detecting means to detect a bus voltage of the inverter are provided, in which the inverter control means includes dormant refrigerant detecting means to detect a dormant state of refrigerant in the compressor, high-frequency AC voltage generating means to output a high-frequency AC voltage command out of a range of an operating frequency when the motor is undergoing compression operation to a coil of the motor on the basis of an output of the dormant refrigerant detecting means, an amplitude, and a phase, and PWM signal generating means to cause the inverter to generate a high-frequency AC voltage by generating a PWM signal on the basis of the output of the high-frequency AC voltage generating means and the output of the bus voltage detecting means. | 05-10-2012 |
20130152609 | HEAT PUMP DEVICE, HEAT PUMP SYSTEM, AND A CONTROL METHOD OF THREE-PHASE INVERTER - An adder adds a phase θplus, which is n times a size of 60 degrees, to a phase output from a phase switching unit and outputs the phase as a voltage command phase θ. A voltage generation unit generates voltage command value based on the voltage command phase output by the adder and outputs the command value. A drive-signal generation unit, based on an output from the voltage generation unit generates drive signals corresponding to respective switching elements of an inverter, and outputs respective generated drive signals to the corresponding switching elements of the inverter, and generates a high-frequency AC voltage in the inverter. | 06-20-2013 |
20130180273 | HEAT PUMP DEVICE, HEAT PUMP SYSTEM, AND METHOD FOR CONTROLLING THREE-PHASE INVERTER - A selection unit switches between a phase θp and a phase θn different from the phase θp substantially by 180 degrees, and outputs one of them in synchronization with a carrier signal. A voltage-command generation unit generates and outputs three-phase voltage command values Vu*, Vv* and Vw* based on the phase outputted by the selection unit. A PWM-signal generation unit generates three-phase voltage command values Vu*′, Vv*′ and Vw*′ by correcting the three-phase voltage command values Vu*, Vv* and Vw* outputted by the voltage-command generation unit according to a predetermined method, and generates six drive signals corresponding to switching elements of the inverter based on the three-phase voltage command values Vu*′, Vv*′ and Vw*′ and the carrier signal. The PWM-signal generation unit outputs the generated drive signals to the corresponding switching elements of the three-phase inverter, to cause the inverter to generate a high-frequency AC voltage. | 07-18-2013 |
20130269370 | HEAT PUMP DEVICE, HEAT PUMP SYSTEM, AND METHOD FOR CONTROLLING INVERTER - An object of the present invention is to maintain a heating amount constant when a compressor is heated at the time of shutdown of the compressor, regardless of the influences of production tolerance and environment variations. An inverter control unit causes an inverter to generate a high-frequency AC voltage having a de-energized section in which a voltage applied from the inverter to a motor is zero between a section in which the voltage is positive and a section in which the voltage is negative. At this time, the inverter control unit detects a value of a current flowing to the inverter in a detection section residing from immediately before a start of the de-energized section to immediately after an end of the de-energized section, and causes the inverter to generate a high-frequency AC voltage adjusted according to the detected current value. | 10-17-2013 |
20130291578 | HEAT PUMP DEVICE, HEAT PUMP SYSTEM, AND METHOD FOR CONTROLLING THREE-PHASE INVERTER - A voltage-command correction-value computation unit outputs a correction value for correcting a voltage command value according to a bus voltage. A multiplier calculates a voltage command value acquired by correcting the voltage command value based on the correction value. A voltage-command generation unit generates and outputs three-phase voltage command values based on the corrected voltage command value calculated by the multiplier and a phase. A PWM-signal generation unit generates six drive signals corresponding to switching elements of an inverter based on the three-phase voltage command values outputted by the voltage-command generation unit and a carrier signal. The PWM-signal generation unit outputs the generated drive signals to the corresponding switching elements of the three-phase inverter, to cause the inerter to generate a high-frequency AC voltage. | 11-07-2013 |
20130305760 | HEAT PUMP DEVICE, HEAT PUMP SYSTEM, AND METHOD FOR CONTROLLING THREE-PHASE INVERTER - An object of the present invention is to efficiently heat a refrigerant retained in a compressor. An inverter control unit generates six drive signals corresponding to the respective switching elements of the inverter, and outputs the generated drive signals to the corresponding switching elements of the inverter to cause the inverter to generate a high-frequency AC voltage. Particularly, the inverter control unit generates a drive signal having a switching pattern A for turning on all the three switching elements on a positive voltage side or a negative voltage side of the inverter, and subsequent thereto, generates a drive signal having a switching pattern B for turning on two switching elements of the three switching elements and turning off one switching element thereof. | 11-21-2013 |
20140174118 | HEAT PUMP DEVICE, AIR CONDITIONER, AND REFRIGERATING MACHINE - A heat pump device that can efficiently feed a high-frequency current to an electric motor and effectively heat a compressor includes a compressor including a compression mechanism configured to compress a refrigerant and a motor configured to drive the compression mechanism, heat exchangers, an inverter configured to apply a voltage to the motor, and an inverter control unit configured to drive the inverter. The inverter control unit includes a stagnation detecting unit configured to determine whether heating of the compressor is necessary and notify the determination result and a high-frequency-alternating-current-voltage generating unit and a PWM-signal generating unit configured to shift to a heating operation mode when the heating is necessary and, in the heating operation mode, generate PWM signals to provide, based on a heating time carrier signal having two or more frequencies, a period in which a reflux current flows. | 06-26-2014 |
20140286069 | DRIVE DEVICE FOR POWER CONVERTER AND DRIVING METHOD OF POWER CONVERTER - A drive device driving a power converter that includes a switching element formed from a wide bandgap semiconductor, includes a PWM-signal output unit that generates a drive signal that drives the switching element with PWM; an on-speed reducing unit that, when the switching element is changed from off to on, reduces a change rate of the drive signal; and an off-speed improving unit that, when the switching element is changed from on to off, draws charge from the switching element at a high speed and with a charge drawing performance higher than that at a time when the switching element is changed from off to on. | 09-25-2014 |
20140320059 | CONVERTER CIRCUIT AND MOTOR DRIVE CONTROL APPARATUS, AIR-CONDITIONER, REFRIGERATOR, AND INDUCTION HEATING COOKER PROVIDED WITH THE CIRCUIT - A converter circuit capable of being compact and light-weight and capable of reducing switching loss, a motor drive control apparatus, an air-conditioner, a refrigerator, and an induction heating cooker provided with the circuit. The converter circuit including: a step-up converter including a rectifier, a step-up reactor, a switching element, and a reverse current prevention element; a step-up converter having a step-up reactor, a switching element, and a reverse current prevention element and connected in parallel with the step-up converter; switching control unit that controls switching elements; and a smoothing capacitor that is provided at the output of the step-up converters. The switching control unit switches the current mode of the current flowing through the step-up reactors into any of a continuous mode, a critical mode, and a discontinuous mode based on a predetermined condition. | 10-30-2014 |
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 |
20140339900 | POWER SUPPLY SWITCHING DEVICE AND SWITCH BOARD - A power supply switching device and switch board checks whether or not a primary-side voltage of a remote shutoff breaker and a secondary-side voltage thereof become a rated voltage after a commercial power system is recovered from a blackout. Next, when both primary-side voltage and secondary-side voltage become the rated voltage, a contactor is actuated to interconnect a home power system with the commercial power system. Hence, charging of the home power system without causing a user to notice such a charging upon recovery of the commercial power system from a blackout can be prevented. As a result, the safety for the user can be ensured. | 11-20-2014 |
20150028780 | AIR CONDITIONER - An air conditioner includes: an outdoor fan provided in an outdoor unit; a permanent magnet synchronous motor that drives the outdoor fan; an inverter that uses a DC power source as a power source and applies a voltage to the permanent magnet synchronous motor; an inverter control means that controls the output voltage of the inverter; and a shunt resist connected between the DC power source and the inverter. If the outdoor fan is rotating due to an external force while the inverter is stopped, the inverter control means causes the inverter to operate using a brake sequence that brakes the rotation of the outdoor fan, and then causes the inverter to operate using a drive sequence that power-drives the outdoor fan. | 01-29-2015 |