# US 11,077,761 B2 · Power supply system for vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,077,761 B2 - Document ID: US11077761B2 - Status: Granted - Kind: B2 - Application number: 16/419,003 - Filed: 2019-05-22 - Published: 2019-11-28 - Granted: 2021-08-03 - Earliest claimed: 2018-05-25 - Assignees: Honda Motor Co., Ltd. - Applicants: Honda Motor Co., Ltd. - Inventors: Mitsuhiro Takeda - Web page: https://patentgrep.com/patent/US11077761B2 ## CPC - B60L 1/00: Supplying electric power to auxiliary equipment of vehicles (circuit arrangements for charging batteries H02J7/00) - B60L 53/11: {DC charging controlled by the charging station, e.g. mode 4} - B60L 3/0023: {Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train} - B60L 50/51: characterised by AC-motors - B60L 53/22: Constructional details or arrangements of charging converters specially adapted for charging electric vehicles - G01R 31/3842: combining voltage and current measurements - B60L 2210/12: Buck converters - B60L 2210/40: DC to AC converters - B60L 2210/42: Voltage source inverters - B60L 2220/42: with use of more than one motor - B60L 2270/20: Inrush current reduction, i.e. avoiding high currents when connecting the battery - Y02T 10/64: Electric machine technologies in electromobility - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors - Y02T 10/72: Electric energy management in electromobility - Y02T 90/14: Plug-in electric vehicles - 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 - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract To provide a power supply system for a vehicle which can appropriate charge a capacitor on a step-down side, and suppress system failure. The power supply system for a vehicle includes: a high-voltage battery; a first inverter which connects with the high-voltage battery; a drive motor which connects with the first inverter; a high-voltage DCDC converter which steps down the voltage of the high-voltage battery; an accessory, etc. which connects with the high-voltage DCDC converter; a capacitor which connects in parallel with the accessory, etc.; a current sensor, etc. which acquires the charging state of the capacitor; and a VCUECU which controls the high-voltage DCDC converter based on the acquired values of the current sensor, etc. ## Claims ### Claim 1 A power supply system for a vehicle comprising: a storage battery; a first power converter which connects with the storage battery; a first drive motor which connects with the first power converter; a voltage converter which steps down voltage of the storage battery; an electrical machine which connects with the voltage converter; a capacitor which connects in parallel with the electrical machine; a charging state acquisition means for acquiring a charging state of the capacitor; and a control means for controlling the voltage converter based on an acquired value of the charging state acquisition means, wherein the charging state acquisition means is a voltage value acquisition means, and controls the voltage converter so that the charging voltage value of the capacitor rises step-wise. ### Claim 2 (depends on 1) The power supply system for a vehicle according to claim 1, further comprising a switching means for switching between a connected state and isolated state of the storage battery, wherein the control means controls the voltage converter based on the acquired value of the charging state acquisition means when the switching means switched from the isolated state to the connected state. ### Claim 3 (depends on 1) The power supply system for a vehicle according to claim 1, wherein the charging state acquisition means is a current value acquisition means, and controls the voltage converter so that a charging current value to the capacitor becomes constant. ### Claim 4 (depends on 1) The power supply system for a vehicle according to claim 1, wherein the electrical machine is a secondary drive motor which connects via a second power converter. ### Claim 5 (depends on 1) The power supply system for a vehicle according to claim 1, wherein the electrical machine is an accessory. ### Claim 6 (depends on 1) The power supply system for a vehicle according to claim 1, further comprising a switching element disposed between a coil of a voltage converter which steps down the voltage of the storage battery, and an electrical machine which connects with the voltage converter. ### Claim 7 (depends on 6) A power supply system for a vehicle according to claim 6 comprising: a storage battery; a first power converter which connects with the storage battery; a first drive motor which connects with the first power converter; a voltage converter which steps down voltage of the storage battery; an electrical machine which connects with the voltage converter; a capacitor which connects in parallel with the electrical machine; a charging state acquisition means for acquiring a charging state of the capacitor; and a control means for controlling the voltage converter based on an acquired value of the charging state acquisition means, wherein the electrical machine is an accessory, wherein the accessory is: a DC charging unit capable of charging by the DC charging source; an applied voltage value acquisition means for acquiring a voltage value applied to the DC charging unit by an external charging device; a high-voltage charging path which connects from the DC charging unit to between the voltage converter and the storage battery; and a low-voltage charging path which connects from a DC charging unit between a voltage converter and the second power converter, and wherein the control means controls the voltage converter based on an applied voltage acquired value prior to charging start from the low-voltage charging path, and regulates voltage of a capacitor. ### Claim 8 (depends on 7) The power supply system for a vehicle according to claim 7, further comprising a switching means for switching between a connected state and isolated state of the storage battery, wherein the control means controls the voltage converter based on the acquired value of the charging state acquisition means when the switching means switched from the isolated state to the connected state. ### Claim 9 (depends on 7) The power supply system for a vehicle according to claim 7, wherein the charging state acquisition means is a current value acquisition means, and controls the voltage converter so that a charging current value to the capacitor becomes constant. ### Claim 10 (depends on 7) The power supply system for a vehicle according to claim 7, wherein the electrical machine is a secondary drive motor which connects via a second power converter. ### Claim 11 (depends on 7) The power supply system for a vehicle according to claim 7, further comprising a switching element disposed between a coil of a voltage converter which steps down the voltage of the storage battery, and an electrical machine which connects with the voltage converter.