# US 2021/0242799 A1 · Inverter device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0242799 A1 - Document ID: US20210242799A1 - Status: Published application - Kind: A1 - Application number: 17/268,802 - Filed: 2019-07-25 - Published: 2021-08-05 - Earliest claimed: 2018-08-30 - Assignees: Hitachi Automotive Systems, Ltd. - Applicants: Hitachi Automotive Systems, Ltd. - Inventors: Takuya NEMOTO; Toshiyuki AJIMA; Taito KIKUCHI - Web page: https://patentgrep.com/patent/US20210242799A1 ## CPC - H02M 7/5395: by pulse-width modulation - H02M 1/0003: {Details of control, feedback or regulation circuits} - H02M 7/483: Converters with outputs that each can have more than two voltages levels - H02P 27/08: with pulse width modulation - H02M 1/12: Arrangements for reducing harmonics from AC input or output - H02P 23/0027: {using different modes of control depending on a parameter, e.g. the speed} - 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 ## Abstract To suppress torque fluctuations that occur when switching control systems. The inverter, which performs a power conversion operation for converting DC power into AC power, includes an arithmetic control device INV200 which is provided with a voltage command signal generation unit 620, a synthesis processing unit 670, and a carrier wave comparison unit 680. The voltage command signal generation unit 620 has a plurality of control systems, and outputs the first voltage command signal generated based on the first control system among the plurality of control systems, and the second voltage command signal generated based on the second control system different from the first control system among the plurality of control systems. The synthesis processing unit 670 generates a synthesized voltage command signal obtained by synthesizing the first voltage command signal and the second voltage command signal at a predetermined ratio. The carrier wave comparison unit 680 generates a PWM signal which is a gate drive signal for controlling the power conversion operation based on the synthesized voltage command signal. ## Claims ### Claim 1 An inverter device for performing a power conversion operation to convert DC power to AC power, the inverter device comprising: a voltage command signal generation unit that includes a plurality of control systems and outputs a first voltage command signal generated based on a first control system among the plurality of control systems and a second voltage command signal generated based on a second control system different from the first control system among the plurality of control systems; a synthesis processing unit that generates a synthesized voltage command signal obtained by synthesizing the first voltage command signal and the second voltage command signal at a predetermined ratio; and a carrier wave comparison unit that generates a signal for controlling the power conversion operation based on the synthesized voltage command signal. ### Claim 2 (depends on 1) The inverter device according to claim 1, wherein the synthesis processing unit generates the synthesized voltage command signal when the first control system is switched to the second control system. ### Claim 3 (depends on 2) The inverter device according to claim 2, wherein when a modulation factor changes over a predetermined threshold, the voltage command signal generation unit switches from the first control system to the second control system, and the synthesis processing unit generates the synthesized voltage command signal in a predetermined switching period that includes a timing at which the modulation factor crosses the threshold. ### Claim 4 (depends on 1) The inverter device according to claim 1, wherein the synthesis processing unit generates the synthesized voltage command signal when the first control system is not switched to the second control system. ### Claim 5 (depends on 2) The inverter device according to claim 2, wherein the synthesis processing unit adds a value obtained by multiplying the first voltage command signal by a variable coefficient of 0 or more and 1 or less, and a value obtained by multiplying the second voltage command signal by a value obtained by subtracting the coefficient from 1 so as to generate the synthesized voltage command signal. ### Claim 6 (depends on 5) The inverter device according to claim 5, wherein the coefficient decreases as time elapses. ### Claim 7 (depends on 5) The inverter device according to claim 5, wherein the coefficient is set based on a predetermined harmonic included in the first voltage command signal. ### Claim 8 (depends on 1) The inverter device according to claim 1, wherein one of the first control system and the second control system is one of a sinusoidal PWM control system that generates a voltage command signal using a sinusoidal modulated wave, a third harmonic superimposition PWM control system that generates a voltage command signal using a modulated wave in which a third harmonic is superimposed on a sine wave, and an overmodulation PWM control system that generates a voltage command signal using a trapezoidal modulated wave, and another one of the first control system and the second control system is a rectangular wave control system that generates a voltage command signal using a rectangular modulated wave. ### Claim 9 (depends on 1) The inverter device according to claim 1, wherein one of the first control system and the second control system is one of a sinusoidal PWM control system that generates a voltage command signal using a sinusoidal modulated wave or a third harmonic superimposition PWM control system that generates a voltage command signal using a modulated wave in which a third harmonic is superimposed on a sine wave, and another one of the first control system and the second control system is an overmodulation PWM control system that generates a voltage command signal using a trapezoidal modulated wave. ### Claim 10 (depends on 1) The inverter device according to claim 1, wherein one of the first control system and the second control system is a sinusoidal PWM control system that generates a voltage command signal using a sinusoidal modulated wave, and another one of the first control system and the second control system is a third harmonic superimposition PWM control system that generates a voltage command signal using a modulated wave in which a third harmonic is superimposed on a sine wave.