To suppress an electric current, which runs through an auxiliary machine power line side from a second battery side with a discharge circuit, from running through a switch side of a charge circuit.SOLUTION: A power supply system 10 includes: a first battery 11; a second battery 12; a DCDC converter 13; an auxiliary machine power line 17 for connecting an on-vehicle auxiliary machine 110 with the DCDC converter 13; a discharge circuit 23 for permitting that an electric current runs through the auxiliary machine power line 17 from the second battery 12 side when a voltage of the auxiliary machine power line 17 is less than a voltage of the second battery 12; a charge circuit 24 for stepping down an output voltage of the DCDC converter 13 to be input into the second battery 12 by repeating on-off operations of a second switching element 42; and a controller 80 for maintaining that the second switching element 42 is under an off state when the discharge circuit 23 permits that an electric current runs through the auxiliary machine power line 17 side from the second battery 12 side.SELECTED DRAWING: Figure 1
【課題】放電回路で第2バッテリ側から補機電力ライン側に流れた電流が、充電回路の開閉器側に流れることを抑制できるようにすること。【解決手段】電源システム10は、第1バッテリ11と、第2バッテリ12と、DCDCコンバータ13と、車載の補機110とDCDCコンバータ13とを繋ぐ補機電力ライン17と、補機電力ライン17の電圧が第2バッテリ12の電圧未満であるときに第2バッテリ12側から補機電力ライン17側に電流が流れることを許容する放電回路23と、第2スイッチング素子42のオン・オフを繰り返すことにより、DCDCコンバータ13の出力電圧を降圧させて第2バッテリ12に入力させる充電回路24と、放電回路23で第2バッテリ12側から補機電力ライン17側に電流が流れるときには、第2スイッチング素子42がオフである状態を維持する制御装置80とを備える。【選択図】図1
VEHICULAR POWER SUPPLY SYSTEM
車両用電源システム
2021-11-01
Patent
Electronic Resource
Japanese
IPC: | H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / H01M Verfahren oder Mittel, z.B. Batterien, für die direkte Umwandlung von chemischer in elektrische Energie , PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY |
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