# US 2018/0026567 A1 · Current conversion method and device and vehicle comprising such a device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0026567 A1 - Document ID: US20180026567A1 - Status: Published application - Kind: A1 - Application number: 15/539,303 - Filed: 2016-01-06 - Published: 2018-01-25 - Earliest claimed: 2015-01-06 - Assignees: Universite Celrmont Auvergne; Centre Natiaon de la Recherche Scientifique - Applicants: Universite Clermont Auvergne; Centre National de la Recherche Scientifique - Inventors: Khalil EL KHAMLICHI DRISSI; Abbas DEHGHANIKIADEHI; Christophe PASQUIER - Web page: https://patentgrep.com/patent/US20180026567A1 ## CPC - H02P 27/08: with pulse width modulation - B60L 50/51: characterised by AC-motors - H02M 1/12: Arrangements for reducing harmonics from AC input or output - H02M 1/14: Arrangements for reducing ripples from DC input or output - H02M 1/44: Circuits or arrangements for compensating for electromagnetic interference in converters or inverters - H02M 7/53873: {with digital control} - H02M 7/5395: by pulse-width modulation - H02P 21/22: Current control, e.g. using a current control loop - B60L 2210/44: Current source inverters - B60L 2220/14: Synchronous machines - H02M 1/0058: {by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero (using an auxiliary actively switched resonant commutation circuit connected to an intermediate DC voltage or between two push-pull branches of an inverter bridge H02M7/4811; in resonant inverters H02M7/4815; in inverters operating from a resonant DC source H02M7/4826)} - 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 - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS - B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES - 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) - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract A power-conversion method for a vehicle including a three-phase electric motor, two three-phase inverters, each inverter being controlled via modulation of at least six spatial vectors, the output voltage of each inverter being given by a spatial vector referred to as “reference spatial vector”. The method includes the following steps: applying an activation sequence to the spatial vectors of one inverter, applying an activation sequence to the spatial vectors of the other inverter, subtracting the reference spatial vector of one inverter from the reference spatial vector of the other inverter and supplying the electric motor with electric power, the voltage inducing the electric power being relative to the vector resulting from the subtraction. ## Claims ### Claim 1 A current conversion method for a vehicle comprising: a three-phase electric motor, two three-phase inverters, each inverter being controlled via a modulation of at least six space vectors, the output voltage of each inverter being given by a space vector referred to as a “reference space vector”, the method comprising the following steps: applying an activation sequence to the space vectors of one inverter, applying an activation sequence to the space vectors of the other inverter, subtracting the reference space vector of one inverter from the reference space vector of another inverter and supplying the electric motor with electric current, the voltage inducing the electric current being relative to the vector resulting from the subtraction. ### Claim 2 (depends on 1) The method as claimed in claim 1, wherein the activation sequences are configured so that the reference vectors are phase-shifted. ### Claim 3 (depends on 1) The method as claimed in claim 1, wherein each activation sequence of an inverter is configured so that two space vectors of the inverter, VI and Vi+1, with i an integer between one and six, are activated consecutively by the activation sequence. ### Claim 4 (depends on 3) The method as claimed in claim 3, wherein, for an inverter On controlled according to a conventional modulation of eight space vectors Vi with i an integer between zero and seven, with n an integer between one and two: the conventional duty cycle, ∝i,CSVMn, of a vector Vi activated by the activation sequence is given by the following formula: ∝ i , CSVM n  = V ref , pu n  ( sin  ( i  π 3 - θ n ) sin  ( π 3 ) ) the conventional duty cycle, ∝i+1,CSVMn of the vector Vi+1 activated consecutively by the activation sequence is given by the formula: ∝ i + 1 , CSVM n  = V ref , pu n  ( sin  ( θ n - ( i - 1 )  π 3 ) sin  ( π 3 ) ) where, i is an integer between one and six, θn is the phase of the conventional reference vector, and Vref,pun is the ratio between the norm of the conventional reference vector of the inverter n and the norm of the space vector Vi, the conventional reference space vector, {right arrow over (V)}ref,CSVMn, of the inverter activated by the activation sequence is given by the following formula: V -> ref , CSVM n = ∝ i , CSVM n  V -> i +  ∝ i + 1 , CSVM n  V -> i + 1 + ( 1 -  ∝ i , CSVM n  - ∝ i + 1 , CSVM n 2 )  ( V -> 0 + V -> 7 ) ### Claim 5 (depends on 4) The method as claimed in claim 4, wherein, for an inverter On, with n an integer between one and two: the modified duty cycle, ∝in, of a vector Vi activated by the activation sequence is given by the following formula: ∝ i n  = 1 2 - ∝ i + 1 , CSVM n  - ∝ i , CSVM n 2 = 1 2 - V ref , pu n  sin  ( θ n - ( i - 1 2 )  π 3 ) the modified duty cycle, ∝i+in, of the vector Vi+1 activated consecutively by the activation sequence is given by the formula: ∝ i + 1 n  = 1 2 + ∝ i + 1 , CSVM n  - ∝ i , CSVM n 2 = 1 2 + V ref , pu n  sin  ( θ n - ( i - 1 2 )  π 3 ) where, i is an integer between one and six, θn is the phase of the conventional reference vector, and Vref,pun is the ratio between the norm of the conventional reference vector of the inverter n and the norm of the space vector Vi, the modified reference space vector, {right arrow over (V)}refn, of the inverter activated by the activation sequence is given by the following formula: V -> ref n = V -> i + V -> i + 1 2 + ( ∝ i + 1 , CSVM n  - ∝ i , CSVM n )  V -> i + 1 - V -> i 2 = ∝ i n  V -> 1 +  ∝ i + 1 n  V -> i + 1 ### Claim 6 (depends on 1) The method as claimed in claim 1, in which the activation sequences are independent. ### Claim 7 A current conversion device, comprising: two three-phase inverters, each inverter being controlled via a modulation of at least six space vectors, the output voltage of each inverter being given by a space vector referred to as a “reference space vector”. means for applying an activation sequence to the space vectors of one inverter, means for applying an activation sequence to the space vectors of the other inverter, means for subtracting the reference space vector of one inverter from the reference space vector of another inverter and means for connecting to an electric power supply source. ### Claim 8 (depends on 7) A vehicle, comprising a device as claimed in claim 7, and a three-phase electric motor.