# US 2021/0242796 A1 · Power converting apparatus, motor driving apparatus, and air conditioner > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0242796 A1 - Document ID: US20210242796A1 - Status: Published application - Kind: A1 - Application number: 17/273,906 - Filed: 2018-09-28 - Published: 2021-08-05 - Earliest claimed: 2018-09-28 - Assignees: Mitsubishi Electric Corporation - Applicants: Mitsubishi Electric Corporation - Inventors: Keisuke UEMURA; Satoru ICHIKI; Takuya SHIMOMUGI; Koichi ARISAWA; Kenji IWAZAKI - Web page: https://patentgrep.com/patent/US20210242796A1 ## CPC - H02M 1/0048: {Circuits or arrangements for reducing losses (using snubbers H02M1/34)} - H02M 7/219: in a bridge configuration - F24F 11/88: Electrical aspects, e.g. circuits - H02M 1/0009: {Devices or circuits for detecting current in a converter} - H02M 1/0054: {Transistor switching losses (periodically suspending operation of switching converter in low power mode H02M1/0035)} - H02P 27/08: with pulse width modulation - H02M 1/38: Means for preventing simultaneous conduction of switches - H02M 5/4585: {having a rectifier with controlled elements} - H02M 7/003: {Constructional details, e.g. physical layout, assembly, wiring or busbar connections} - H02P 2201/15: Power factor correction [PFC] circuit generating the DC link voltage for motor driving inverter - Y02B 70/10: Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) - F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02) - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract A power converting apparatus includes: a reactor that includes a first terminal and a second terminal, the first terminal being connected to an alternating-current power supply; a bridge circuit that is connected to the second terminal of the reactor, includes at least one or more switching elements, and converts an alternating-current voltage output from the alternating-current power supply into a direct-current voltage; a power-supply current detecting unit that detects a current from the alternating-current power supply; and a control unit that controls ON and OFF of the switching elements depending on a current value detected by the power-supply current detecting unit, in which two or more current thresholds for controlling ON and OFF of the switching elements are included. ## Claims ### Claim 1 A power converting apparatus comprising: a reactor including a first terminal and a second terminal, the first terminal being connected to an alternating-current power supply; a bridge circuit connected to the second terminal of the reactor and including at least one or more switching elements, the bridge circuit converting an alternating-current voltage output from the alternating-current power supply into a direct-current voltage; a current detector detecting a current from the alternating-current power supply; a processor; and a memory storing a program which, when executed by the processor, performs processes of: controlling ON and OFF of the switching elements depending on a current value detected by the current detector, wherein the power converting apparatus includes two or more current thresholds for controlling ON and OFF of the switching elements, when an absolute value of the current value is equal to or larger than a first current threshold and equal to or smaller than a second current threshold, at least one or more of the switching elements is turned ON depending on a polarity of the current value, and when the absolute value of the current value is smaller than the first current threshold or larger than the second current threshold, at least one or more of the switching elements is turned OFF. ### Claim at position 2 2-4. (canceled) ### Claim 5 (depends on 1) The power converting apparatus according to claim 1, wherein the second current threshold is a value determined depending on characteristics of a voltage necessary for a current to flow through diodes connected in parallel with the switching elements and characteristics of a voltage necessary for a current to flow through the switching elements. ### Claim 6 (depends on 1) A motor driving apparatus for driving a motor, the motor driving apparatus comprising: the power converting apparatus according to claim 1; an inverter converting a direct-current power output from the power converting apparatus into an alternating-current power, and outputting the alternating-current power to the motor. ### Claim 7 (depends on 6) An air conditioner comprising: a motor; and the motor driving apparatus according to claim 6. ### Claim 8 (depends on 5) A motor driving apparatus for driving a motor, the motor driving apparatus comprising: the power converting apparatus according to claim 5; an inverter converting a direct-current power output from the power converting apparatus into an alternating-current power, and outputting the alternating-current power to the motor. ### Claim 9 (depends on 8) An air conditioner comprising: a motor; and the motor driving apparatus according to claim 8.