# US 10,312,827 B2 · Power conversion device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,312,827 B2 - Document ID: US10312827B2 - Status: Granted - Kind: B2 - Application number: 15/763,273 - Filed: 2016-11-15 - Published: 2018-09-27 - Granted: 2019-06-04 - Earliest claimed: 2015-11-16 - Assignees: Aisin Aw Co., Ltd. - Applicants: Aisin Aw Co., Ltd. - Inventors: Subrata Saha; Arinori Shimada; Yutaka Hotta - Web page: https://patentgrep.com/patent/US10312827B2 ## CPC - H02M 7/53871: {with automatic control of output voltage or current} - H02M 1/08: Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters - H02M 7/5387: in a bridge configuration - H02P 21/22: Current control, e.g. using a current control loop - H02P 27/085: {wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency} - H02M 1/0054: {Transistor switching losses (periodically suspending operation of switching converter in low power mode H02M1/0035)} - 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) - 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 conversion device that includes an inverter circuit in which arms are connected in parallel to each other between a DC positive terminal and a DC negative terminal in accordance with a number of phases of alternating currents of a plurality of phases, the arms for the respective phases each including two switch sections that are connected in series and to be brought into conduction in an on state and out of conduction in an off state, the power conversion device being configured to convert electric power between DC power and AC power of the plurality of phases while a connection point between the two switch sections of each of the arms is set as an AC input or output point of each phase. ## Claims ### Claim 1 A power conversion device comprising: an inverter circuit in which arms are connected in parallel to each other between a DC positive terminal and a DC negative terminal in accordance with a number of phases of alternating currents of a plurality of phases, the arms for the respective phases each including two switch sections that are connected in series and to be brought into conduction in an on state and out of conduction in an off state, the power conversion device being configured to convert electric power between DC power and AC power of the plurality of phases while a connection point between the two switch sections of each of the arms is set as an AC input or output point of each phase, wherein each of the switch sections includes a switching element and a freewheeling diode connected in parallel to the switching element while a direction from the negative terminal to the positive terminal is set as a forward direction, the switching element is a first switching element or a second switching element that is higher in a switching response between the off state and the on state than the first switching element, the freewheeling diode is a first rectifying element or a second rectifying element that is shorter in a reverse recovery time than the first rectifying element, and in each of the arms, one of the switch sections including an upper-stage switch section connected to a positive terminal side and a lower-stage switch section connected to a negative terminal side is structured through parallel connection between the first switching element and the second rectifying element, and the other of the switch sections is structured through parallel connection between the second switching element and the first rectifying element. ### Claim 2 (depends on 1) The power conversion device according to claim 1, comprising a controller that outputs switching control signals for performing switching control on the switch sections, wherein each of the arms has an operating state in which a frequency of the switching control signal for the second switching element is higher than a frequency of the switching control signal for the first switching element. ### Claim 3 (depends on 2) The power conversion device according to claim 2, comprising a controller that outputs switching control signals for performing switching control on the switch sections, wherein during a period in which a forward current flows through the freewheeling diode of each of the arms, the switching control signal for the switching element connected in parallel to the freewheeling diode is in an ineffective state. ### Claim 4 (depends on 3) The power conversion device according to claim 3, wherein a frequency of the switching control signal for the first switching element has a fixed value, and a frequency of the switching control signal for the second switching element has a variable value. ### Claim 5 (depends on 4) The power conversion device according to claim 4, wherein the power conversion device is provided between an AC rotating electrical machine and a DC power supply, and the frequency of the switching control signal is set in accordance with at least one of a speed of the rotating electrical machine, a torque of the rotating electrical machine, and a modulation rate from a direct current to an alternating current. ### Claim 6 (depends on 5) The power conversion device according to claim 5, wherein the first switching element is a Si-IGBT or a Si-MOSFET, and the second switching element is a SiC-MOSFET, a GaN-MOSFET, or a SiC-IGBT. ### Claim 7 (depends on 6) The power conversion device according to claim 6, wherein the first rectifying element is a fast recovery diode, and the second rectifying element is a SiC-Schottky barrier diode. ### Claim 8 (depends on 1) The power conversion device according to claim 1, comprising a controller that outputs switching control signals for performing switching control on the switch sections, wherein during a period in which a forward current flows through the freewheeling diode of each of the arms, the switching control signal for the switching element connected in parallel to the freewheeling diode is in an ineffective state. ### Claim 9 (depends on 1) The power conversion device according to claim 1, wherein the first switching element is a Si-IGBT or a Si-MOSFET, and the second switching element is a SiC-MOSFET, a GaN-MOSFET, or a SiC-IGBT. ### Claim 10 (depends on 1) The power conversion device according to claim 1, wherein the first rectifying element is a fast recovery diode, and the second rectifying element is a SiC-Schottky barrier diode. ### Claim 11 (depends on 2) The power conversion device according to claim 2, wherein a frequency of the switching control signal for the first switching element has a fixed value, and a frequency of the switching control signal for the second switching element has a variable value. ### Claim 12 (depends on 2) The power conversion device according to claim 2, wherein both of a frequency of the switching control signal for the first switching element and a frequency of the switching control signal for the second switching element have variable values. ### Claim 13 (depends on 2) The power conversion device according to claim 2, wherein the power conversion device is provided between an AC rotating electrical machine and a DC power supply, and the frequency of the switching control signal is set in accordance with at least one of a speed of the rotating electrical machine, a torque of the rotating electrical machine, and a modulation rate from a direct current to an alternating current. ### Claim 14 (depends on 2) The power conversion device according to claim 2, wherein the first switching element is a Si-IGBT or a Si-MOSFET, and the second switching element is a SiC-MOSFET, a GaN-MOSFET, or a SiC-IGBT. ### Claim 15 (depends on 2) The power conversion device according to claim 2, wherein the first rectifying element is a fast recovery diode, and the second rectifying element is a SiC-Schottky barrier diode. ### Claim 16 (depends on 3) The power conversion device according to claim 3, wherein both of a frequency of the switching control signal for the first switching element and a frequency of the switching control signal for the second switching element have variable values. ### Claim 17 (depends on 3) The power conversion device according to claim 3, wherein the power conversion device is provided between an AC rotating electrical machine and a DC power supply, and the frequency of the switching control signal is set in accordance with at least one of a speed of the rotating electrical machine, a torque of the rotating electrical machine, and a modulation rate from a direct current to an alternating current. ### Claim 18 (depends on 3) The power conversion device according to claim 3, wherein the first switching element is a Si-IGBT or a Si-MOSFET, and the second switching element is a SiC-MOSFET, a GaN-MOSFET, or a SiC-IGBT. ### Claim 19 (depends on 3) The power conversion device according to claim 3, wherein the first rectifying element is a fast recovery diode, and the second rectifying element is a SiC-Schottky barrier diode. ### Claim 20 (depends on 4) The power conversion device according to claim 4, wherein the first switching element is a Si-IGBT or a Si-MOSFET, and the second switching element is a SiC-MOSFET, a GaN-MOSFET, or a SiC-IGBT.