Patent application number | Description | Published |
20080266811 | Motor Drive Circuit And Outdoor Unit For Air Conditioner - One of the purpose is to obtain a motor drive circuit and an outdoor unit for an air conditioner using the same, which can flexibly support change of a model at a low price and in a small lot without using unnecessary materials, wherein a stress in a soldering part due to self-heating is low, a solder reliability is high, and design constraints are small, while maintaining a low-noise and low-loss power wiring due to lowering inductance. The motor drive circuit according to the present invention, for driving the motor using the converter circuit and the inverter circuit, whereon electronic components making up a converter circuit and an inverter circuit are mounted, which includes a lead frame molded board | 10-30-2008 |
20110019452 | AC-DC CONVERTER AND COMPRESSOR DRIVING APPARATUS AND AIR CONDITIONING APPARATUS USING THE SAME - An AC-DC converter is provided which suppresses a harmonic current and improves power factor at low cost. Such an AC-DC converter includes a rectifier connected to an AC power supply via a reactor, capacitors connected in series across the output terminals of the rectifier, a first bidirectional switch having one end connected to one input terminal of the rectifier and the other end connected to a connecting point of capacitors, a second bidirectional switch having one end connected to the other input terminal of the rectifier and the other end connected to the other end of the first bidirectional switch, and a control circuit for actuating the first and second bidirectional switches during a half cycle of the AC power supply so as to control a voltage inputted to the rectifier to a desired output voltage. | 01-27-2011 |
20110101898 | AC-DC CONVERTER, METHOD OF CONTROLLING THE SAME, MOTOR DRIVER, COMPRESSOR DRIVER, AIR-CONDITIONER, AND HEAT PUMP TYPE WATER HEATER - A rectifier connected with an AC source through a reactor, a plurality of capacitors connected in series between output terminals of the rectifier, first switching means connected between one input terminal of the rectifier and a connection point of a plurality of capacitors, second switching means connected between the other input terminal of the rectifier and the connection point of a plurality of capacitors, and a plurality of diodes connected with the plurality of capacitors in inverse-parallel are provided. | 05-05-2011 |
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 |
20110227522 | ALTERNATING-CURRENT DIRECT-CURRENT CONVERTER AND ELECTRIC MOTOR DRIVER - Provided is an alternating-current direct-current converter capable of controlling a harmonic current and improving a power factor at reduced costs. The alternating-current direct-current converter includes two capacitors connected in series between output terminals of a rectifier; a first switch connected between one input terminal of the rectifier and a connection point of the capacitors; a second switch connected between the other input terminal of the rectifier and the connection point of the capacitors; a voltage detector which detects terminal voltages of the capacitors; a current detector which detects a current input from the alternating current power supply; and a control means which drives and controls the first switch and the second switch, in which the control means drives and controls the first switch and the second switch such that the terminal voltages of the capacitors are fixed and a power supply power factor is improved using an active power component and a reactive power component obtained by conversion of detection results of the current detector and detection results of voltage detector. | 09-22-2011 |
20120086374 | INVERTER DEVICE, MOTOR DRIVING DEVICE, REFRIGERATING AIR CONDITIONER, AND POWER GENERATION SYSTEM - An inverter device, a motor driving device, a refrigerating air conditioner, and a power generation system, which can reduce the recovery loss thereof, are obtained. A plurality of arms that can conduct and block current are provided. At least one of the plurality of arms includes: a plurality of switching elements each having a parasitic diode and being connected in series with each other; and a reverse current diode connected in parallel with the plurality of switching elements. | 04-12-2012 |
20130152624 | POWER CONVERTER AND REFRIGERATING AND AIR-CONDITIONING APPARATUS - A power converter includes step-up means for varying a voltage applied by a power supply to a predetermined voltage, commutating means for performing a commutation operation for allowing a current flowing through the step-up means to flow through a second path, smoothing means for smoothing a voltage related to outputs of the step-up means and the commutating means to produce power and supplying the power to a load side, and control means for performing control related to voltage varying, such as stepping up, by the step-up means and controlling the commutation operation of the commutating means on the basis of at least one of a voltage and a current related to the step-up means. | 06-20-2013 |
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 |
20130334884 | POWER CONVERSION DEVICE AND REFRIGERATION/AIR-CONDITIONING SYSTEM - A power conversion device according to the present invention includes a power supply, a booster unit (a reactor, a switch) that boosts a voltage supplied from the power supply by switching control, a smoothing circuit that smoothes an output voltage from the booster unit, a rectifier that is arranged between the booster unit and the smoothing circuit to prevent a current reverse flow toward the booster unit, and a commutation unit that is connected to the rectifier in parallel to commutate a current flowing through the rectifier toward itself. | 12-19-2013 |
20130342139 | POWER CONVERTING DEVICE, MOTOR DRIVING DEVICE, AND REFRIGERATING AND AIR-CONDITIONING APPARATUS - A power converting device includes a rectifying circuit that rectifies voltage of an alternating-current power supply; smoothing means that smoothes output voltage from the rectifying circuit; short-circuiting means that is disposed more closely to the alternating-current power supply than the smoothing means and that short-circuits the alternating-current power supply and controls at least one of electric current and voltage; a reactor that is disposed more closely to the alternating-current power supply than the short-circuiting means; one or more backflow preventing elements that prevent electric current from flowing backward from a load side toward the alternating-current power supply; commutating means for performing a commutation operation for causing electric current to flow toward a different path that is connected in parallel with the one or more backflow preventing elements; malfunction detecting means for detecting a malfunction of the commutating means; and switching control means that performs operation control of the commutating means in accordance with detection by the malfunction detecting means. | 12-26-2013 |
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 |
20140204491 | BACKFLOW PREVENTING MEANS, POWER CONVERTING DEVICE, AND REFRIGERATING AND AIR-CONDITIONING APPARATUS - For example, backflow preventing means is provided, which reduces a recovery electric current occurring in the event of backflow of an electric current so as to ensure high efficiency, high reliability, etc. The backflow preventing means includes a backflow preventing element, such as a rectifying element, which is connected between an alternating-current power supply and a load and prevents the electric current from flowing backward from the load toward the alternating-current power supply; and commutating means for performing a commutation operation for causing the electric current to flow toward a different path that is connected in parallel with the backflow preventing element, whereby a conduction loss and a loss caused by the electric current can be reduced. | 07-24-2014 |
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 |
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 |
20150102759 | POWER CONVERSION DEVICE, MOTOR DRIVE CONTROL APPARATUS INCLUDING THE POWER CONVERSION DEVICE, AIR BLOWER AND COMPRESSOR INCLUDING THE MOTOR DRIVE CONTROL APPARATUS, AND AIR CONDITIONER INCLUDING THE AIR BLOWER OR THE COMPRESSOR - A power conversion device includes a switching control unit that controls respective switching elements constituting a plurality of chopper circuits, a rectified-voltage detection unit, a bus-bar voltage detection unit, and a bus-bar current detection unit. The switching control unit includes an on-duty calculation unit that calculates a reference on-duty of respective drive pulses with respect to the switching elements based on a bus-bar voltage and a bus-bar current, an on-duty correction unit that corrects the reference on-duty to output on-duties of the respective drive pulses based on the bus-bar current, so that change amounts of respective reactor currents become substantially the same, and a drive-pulse generation unit that generates the respective drive pulses, based on the respective on-duties. | 04-16-2015 |
20150121929 | MOTOR INCORPORATING POWER CONVERTER, AND AIR CONDITIONER, WATER HEATER, AND VENTILATION BLOWER INCORPORATING THE MOTOR - A motor incorporating a power converter including a printed board on which a semiconductor module (an inverter IC), which converts a voltage of an external power supply into a high-frequency voltage and supplies the high-frequency voltage to a stator, is mounted, wherein a high-voltage circuit ground, which is a power ground of a high-voltage main circuit system of the inverter IC, and a low-voltage circuit ground, which is a ground of a control circuit system, which is a low-voltage circuit, of the semiconductor module, are provided on the board, and the high-voltage circuit ground and the low-voltage circuit ground are connected at one point via a resistor. | 05-07-2015 |
20150288201 | CHARGING/DISCHARGING DEVICE - A charging/discharging device includes a charging/discharging connector that electrically connects a storage battery and the charging/discharging device, a cable that is connected to the charging/discharging connector at one end and is connected to the charging/discharging device at the other end, a power conversion unit, a control unit that controls an operation of the power conversion unit, and an abnormality detection unit that outputs an abnormality detection signal for stopping an operation of the power conversion unit to at least any of the control unit and the power conversion unit, when an output from a comparator and an ON signal from the control unit are input to an AND circuit. | 10-08-2015 |
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 |
20160036350 | POWER CONVERSION DEVICE AND MOTOR DRIVING DEVICE - The power conversion device includes a power-supply shunt resistor provided between a negative voltage side of a DC power supply and an inverter and phase lower-arm shunt resistors respectively provided between phase lower-arm switching elements of two arms among three arms and the power-supply shunt resistor. The power conversion device detects voltages between connection points of the phase lower-arm switching elements and the phase lower-arm shunt resistors and a negative voltage side of the DC power supply and calculates, on the basis of detection values of the voltages, phase currents flowing to a load device. | 02-04-2016 |
20160049896 | POWER CONVERSION DEVICE, MOTOR DRIVE DEVICE INCLUDING POWER CONVERSION DEVICE, AIR BLOWER AND COMPRESSOR INCLUDING MOTOR DRIVE DEVICE, AND AIR CONDITIONER, REFRIGERATOR, AND FREEZER INCLUDING AIR BLOWER AND COMPRESSOR - The power conversion device includes a power-supply shunt resistance provided between an inverter and the negative-voltage side of a DC power supply, respective-phase lower-arm shunt resistances provided between the power-supply shunt resistance and respective-phase lower-arm switching elements, a first overcurrent detection unit performing overcurrent detection on a current that flows through the power-supply shunt resistance on the basis of a power-supply shunt-resistance voltage, and a second overcurrent detection unit performing overcurrent detection on each current that flows through the respective-phase lower-arm shunt resistances on the basis of respective-phase lower-arm voltages, wherein overcurrent detection is performed on each phase current using either one of the overcurrent detection result of the first overcurrent detection unit and the overcurrent detection result of the second overcurrent detection unit. | 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 |
20160087547 | POWER CONVERSION DEVICE, MOTOR DRIVE CONTROL DEVICE EQUIPPED WITH POWER CONVERSION DEVICE, COMPRESSOR AND BLOWER EQUIPPED WITH MOTOR DRIVE CONTROL DEVICE, AND AIR CONDITIONER EQUIPPED WITH COMPRESSOR OR BLOWER - A power conversion device is configured to have reactors and is configured to have chopper circuit units, connected in series, that chop the output of a rectifier configured to rectify an AC voltage from an AC power supply. The power conversion device includes: an AC switch disposed on a side closer to the AC power supply than the chopper circuit units; an AC reactor that is connected in parallel to the AC switch; and a switching control unit that stops the switching of the switching elements when the contact of the AC switch is open. | 03-24-2016 |
20160094177 | POWER CONVERSION DEVICE AND MOTOR DRIVE DEVICE INCLUDING POWER CONVERSION DEVICE - A power conversion device includes a power-supply shunt resistance that is provided between an inverter and the negative-voltage side of a DC power supply, and respective-phase lower-arm shunt resistances that are provided between the power-supply shunt resistance and respective-phase lower-arm switching elements. Respective-phase lower-arm voltages, that are respective voltages between the negative-voltage side of the DC power supply and connection points between the respective-phase lower-arm switching elements and the respective-phase lower-arm shunt resistances, are detected to calculate respective-phase currents that flow through a load device in accordance with detection values of the respective-phase lower-arm voltages, and to control a carrier frequency of a carrier signal, which serves as a reference frequency of each drive signal, according to a change in a specific control parameter A. | 03-31-2016 |