# US 11,451,149 B2 · Power converter > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,451,149 B2 - Document ID: US11451149B2 - Status: Granted - Kind: B2 - Application number: 17/045,627 - Filed: 2018-05-29 - Published: 2021-01-28 - Granted: 2022-09-20 - Earliest claimed: 2018-05-29 - Assignees: Mitsubishi Electric Corporation - Applicants: Mitsubishi Electric Corporation - Inventors: Kenji Iwazaki; Koichi Arisawa; Takashi Yamakawa; Takuya Shimomugi; Satoru Ichiki; Ikuro Suga - Web page: https://patentgrep.com/patent/US11451149B2 ## CPC - H02M 1/34: Snubber circuits - H02M 1/4225: {using a non-isolated boost converter} - H02M 1/44: Circuits or arrangements for compensating for electromagnetic interference in converters or inverters - H02M 3/158: including plural semiconductor devices as final control devices for a single load - H02M 3/1584: {with a plurality of power processing stages connected in parallel} - H02M 5/458: using semiconductor devices only - H02M 7/06: using discharge tubes without control electrode or semiconductor devices without control electrode - H02P 27/06: using DC to AC converters or inverters (H02P27/05 takes precedence) - F24F 11/88: Electrical aspects, e.g. circuits - H02M 1/0048: {Circuits or arrangements for reducing losses (using snubbers H02M1/34)} - H02M 1/0051: {Diode reverse recovery losses} - H02M 1/32: Means for protecting converters other than automatic disconnection - H02M 1/342: {Active non-dissipative snubbers} - H02M 1/346: {Passive non-dissipative snubbers} - 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) - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS - 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) ## Abstract A power converter is connected between a power supply source of a first direct current power and a power supply destination of a second direct current power obtained by performing power conversion on the first direct current power. The power converter includes: a switching element; a reactor; a first diode; a first capacitor; a second diode. The reactor is connected to a first end of the switching element. The first end of the switching element and a first end of the reactor are connected to a first connection point. A cathode of the first diode is connected to a second end of the reactor. The cathode of the first diode and the second end of the reactor are connected to a second connection point. The second diode includes an anode connected to the first connection point and a cathode connected to the power supply destination. ## Claims ### Claim 1 A power converter connected between a supply source of a first direct current power and a supply destination of a second direct current power obtained by performing power conversion on the first direct current power, the power converter comprising: a switching element; a reactor connected to a first end of the switching element; a first diode having an anode connected to a first connection point and having a cathode connected to a first end of the reactor, the first end of the switching element and second end of the reactor being connected to each other at the first connection point; a first capacitor connected in parallel with the supply source and having first end connected to a second connection point, the first end of the reactor and the cathode of the first diode being connected to each other at the second connection point; and a second diode having an anode connected to the first connection point and having a cathode connected to the supply destination. ### Claim 2 (depends on 1) The power converter according to claim 1, comprising: a second capacitor connected in parallel with the supply destination and having first end connected to the cathode of the second diode. ### Claim 3 (depends on 2) The power converter according to claim 2, wherein a recovery current flowing from the second capacitor through the second diode flows through the first diode into the first capacitor after turning on of the switching element. ### Claim 4 (depends on 1) The power converter according to claim 1, wherein the first diode is formed of a wide bandgap semiconductor. ### Claim 5 (depends on 1) The power converter according to claim 1, comprising: a plurality of chopper circuits each including the switching element, the reactor, and the second diode, the chopper circuits being connected in parallel with each other such that the second connection points of the respective chopper circuits are connected to each other; and as many of the first diode as the chopper circuits, the first diodes being connected in parallel with the respective reactors of the respective chopper circuits. ### Claim 6 (depends on 5) The power converter according to claim 5, comprising: as many of the first capacitor as the chopper circuits, first end of each of the first capacitors being connected to the second connection point of a corresponding one of the chopper circuits. ### Claim 7 (depends on 5) The power converter according to claim 5, wherein the first end of the first capacitor is connected to a connection point at which the second connection points of the respective chopper circuits are connected to each other. ### Claim 8 (depends on 1) The power converter according to claim 1, comprising: a plurality of chopper circuits each including the switching element and the second diode, the chopper circuits being connected in parallel with each other such that the first ends of the respective switching elements of the respective chopper circuits are connected to each other, and that the second end of the reactor and the anode of the first diode are connected to a connection point of the first ends of the respective switching elements. ### Claim 9 (depends on 1) The power converter according to claim 1, wherein the switching element is formed of a wide bandgap semiconductor. ### Claim 10 (depends on 1) The power converter according to claim 1, wherein the power converter is installed in a converter that converts alternating current power into direct current power. ### Claim 11 (depends on 1) The power converter according to claim 1, wherein the power converter is installed in an electric motor driver that drives an electric motor. ### Claim 12 (depends on 1) The power converter according to claim 1, wherein the power converter is installed in an air-conditioning and refrigeration apparatus.