# US 9,882,491 B2 · Power supply system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,882,491 B2 - Document ID: US9882491B2 - Status: Granted - Kind: B2 - Application number: 14/666,621 - Filed: 2015-03-24 - Published: 2015-10-01 - Granted: 2018-01-30 - Earliest claimed: 2014-03-26 - Assignees: Toyota Jidosha Kabushiki Kaisha - Applicants: Toyota Jidosha Kabushiki Kaisha - Inventors: Masanori Ishigaki; Kenichi Takagi; Kenichiro Nagashita; Takahiro Hirano; Jun Muto - Web page: https://patentgrep.com/patent/US9882491B2 ## CPC - H02J 7/02: for charging batteries from AC mains by converters - B60L 3/003: {relating to inverters} - B60L 3/04: Cutting off the power supply under fault conditions (protective devices and circuit arrangements in general H01H; H02H) - B60L 15/007: {Physical arrangements or structures of drive train converters specially adapted for the propulsion motors of electric vehicles} - B60L 50/51: characterised by AC-motors - B60L 58/21: having the same nominal voltage - H02J 7/56: Active balancing, e.g. using capacitor-based, inductor-based or DC-DC converters - H02M 3/33507: {with automatic control of the output voltage or current, e.g. flyback converters (H02M3/33561, H02M3/33569 take precedence)} - H02M 3/33584: {Bidirectional converters} - B60L 2210/10: DC to DC converters - B60L 2240/527: Voltage - B60L 2240/529: Current - H02J 2207/20: Charging or discharging characterised by the power electronics converter - H02M 1/0074: {Plural converter units whose inputs are connected in series} - H02M 1/008: {Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching regulators} - Y02T 10/64: Electric machine technologies in electromobility - Y02T 10/70: Energy storage systems for electromobility, e.g. batteries - Y02T 10/72: Electric energy management in electromobility - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - 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) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract There is provided a power supply system including a first power supply and a second power supply. The power supply system includes a power conversion circuit capable of bidirectionally sending and receiving power by bidirectional voltage conversion between the first power supply and the second power supply, converting the first voltage from the first power supply to output a third voltage and a fourth voltage, and converting the second voltage from the second power supply to output the third voltage and the fourth voltage. ## Claims ### Claim 1 A power supply system comprising a power conversion circuit, the power conversion circuit being configured to: bidirectionally send and receive power by bidirectional voltage conversion between a first power supply and a second power supply, the first power supply outputting a first voltage and the second power supply outputting a second voltage different from the first voltage; convert the first voltage output from the first power supply to output a third voltage different from the first voltage and the second voltage and to output a fourth voltage different from the first voltage, the second voltage, and the third voltage; and convert the second voltage output from the second power supply to output the third voltage and the fourth voltage, wherein the first power supply comprises a first sub-power supply and a second sub-power supply, wherein the power conversion circuit comprises: a first sub-power conversion circuit configured to perform bidirectional voltage conversion between the first sub-power supply and the second power supply to convert a voltage output from the first sub-power supply to output the third voltage to the second power supply; and a second sub-power conversion circuit configured to perform bidirectional voltage conversion between the second sub-power supply and the second power supply to convert a voltage output from the second sub-power supply to output the fourth voltage to the second power supply, and wherein the first sub-power conversion circuit and the second sub-power conversion circuit are configured to bidirectionally send and receive power between the first sub-power supply. ### Claim 2 (depends on 1) The power supply system according to claim 1, wherein at least one of the first sub-power conversion circuit and the second sub-power conversion circuit comprises: a first bidirectional buck-boost circuit including a first switching circuit connected between a first DC power supply and a primary winding of a transformer; and a second bidirectional buck-boost circuit including a second switching circuit connected between an output terminal of the third voltage and a secondary winding of the transformer, wherein the at least one of the first sub-power conversion circuit and the second sub-power conversion circuit performs voltage conversion between an output voltage of the first DC power supply and the third voltage. ### Claim 3 (depends on 1) The power supply system according to claim 1, wherein the third voltage is higher than the second voltage, that is, an output voltage from the second power supply, the first sub-power conversion circuit is capable of boosting the second voltage from the second power supply to output the third voltage, and the second sub-power conversion circuit is capable of converting the voltage from the second sub-power supply to output the third voltage. ### Claim 4 (depends on 2) The power supply system according to claim 2, wherein the third voltage is higher than the second voltage, that is, an output voltage from the second power supply, the first sub-power conversion circuit is capable of boosting the second voltage from the second power supply to output the third voltage, and the second sub-power conversion circuit is capable of converting the voltage from the second sub-power supply to output the third voltage. ### Claim 5 (depends on 1) The power supply system according to claim 1, wherein the fourth voltage is lower than the second voltage, the first sub-power conversion circuit is capable of converting the voltage from the first sub-power supply to output the fourth voltage, and the first sub-power conversion circuit and the second sub-power conversion circuit are capable of lowering the second voltage to output the fourth voltage. ### Claim 6 (depends on 2) The power supply system according to claim 2, wherein the fourth voltage is lower than the second voltage, the first sub-power conversion circuit is capable of converting the voltage from the first sub-power supply to output the fourth voltage, and the first sub-power conversion circuit and the second sub-power conversion circuit are capable of lowering the second voltage to output the fourth voltage. ### Claim 7 (depends on 3) The power supply system according to claim 3, wherein the fourth voltage is lower than the second voltage, the first sub-power conversion circuit is capable of converting the voltage from the first sub-power supply to output the fourth voltage, and the first sub-power conversion circuit and the second sub-power conversion circuit are capable of lowering the second voltage to output the fourth voltage. ### Claim 8 (depends on 1) The power supply system according to claim 1, further comprising: a circuit breaker between the first sub-power supply and a first bidirectional buck-boost circuit of the first sub-power conversion circuit, and a circuit breaker between the second sub-power supply and a first bidirectional buck-boost circuit of the second sub-power conversion circuit. ### Claim 9 (depends on 1) The power supply system according to claim 1, wherein the first sub-power supply and the second sub-power supply are each configured by dividing the first power supply including a plurality of batteries connected in series. ### Claim 10 (depends on 2) The power supply system according to claim 2, wherein the first sub-power supply and the second sub-power supply are each configured by dividing the first power supply including a plurality of batteries connected in series. ### Claim 11 (depends on 3) The power supply system according to claim 3, wherein the first sub-power supply and the second sub-power supply are each configured by dividing the first power supply including a plurality of batteries connected in series. ### Claim 12 (depends on 5) The power supply system according to claim 5, wherein the first sub-power supply and the second sub-power supply are each configured by dividing the first power supply including a plurality of batteries connected in series. ### Claim 13 (depends on 8) The power supply system according to claim 8, wherein the first sub-power supply and the second sub-power supply are each configured by dividing the first power supply including a plurality of batteries connected in series. ### Claim 14 (depends on 1) The power supply system according to claim 1, wherein the power supply system adjusts power balance between the first sub-power supply and the second sub-power supply by sending and receiving power between the first sub-power supply and the second sub-power supply. ### Claim 15 (depends on 2) The power supply system according to claim 2, wherein the power supply system adjusts power balance between the first sub-power supply and the second sub-power supply by bidirectionally sending and receiving power between the first sub-power supply and the second sub-power supply. ### Claim 16 (depends on 3) The power supply system according to claim 3, wherein the power supply system adjusts power balance between the first sub-power supply and the second sub-power supply by bidirectionally sending and receiving power between the first sub-power supply and the second sub-power supply. ### Claim 17 (depends on 5) The power supply system according to claim 5, wherein the power supply system adjusts power balance between the first sub-power supply and the second sub-power supply by bidirectionally sending and receiving power between the first sub-power supply and the second sub-power supply. ### Claim 18 (depends on 8) The power supply system according to claim 8, wherein the power supply system adjusts power balance between the first sub-power supply and the second sub-power supply by bidirectionally sending and receiving power between the first sub-power supply and the second sub-power supply.