PROBLEM TO BE SOLVED: To provide a vehicular power supply device capable of lowering a voltage of a main-battery prior to switching from off to on of a relay when a voltage of a sub-battery is lowered than the voltage of the main battery with a low-cost constitution.SOLUTION: A main relay 17 is interposed between a main-battery 11 and a sub-battery 12. When the switching from off to on of the main relay 17 is required, a voltage of the main-battery 11 and a voltage of the sub-battery 12 are investigated. When the voltage of the sub-battery 12 is lower than the voltage of the main-battery 11, the main relay 17 is subjected to electric conduction to ISG3 before the main-relay 17 is turned on from off and, thereby, the voltage of the main battery 11 is lowered.

    【課題】低コストな構成により、サブバッテリの電圧がメインバッテリの電圧よりも低下している場合に、リレーのオフからオンへの切替えに先立ち、メインバッテリの電圧を下げることができる、車両用電源装置を提供する。【解決手段】メインバッテリ11とサブバッテリ12との間には、メインリレー17が介装されている。メインリレー17のオフからオンへの切替えが要求されると、メインバッテリ11の電圧およびサブバッテリ12の電圧が調べられる。そして、サブバッテリ12の電圧がメインバッテリ11の電圧よりも低い場合には、メインリレー17がオフからオンに切り替えられる前に、ISG3に通電されることにより、メインバッテリ11の電圧が下げられる。【選択図】図1


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    Title :

    VEHICULAR POWER SUPPLY DEVICE


    Additional title:

    車両用電源装置


    Contributors:

    Publication date :

    2015-07-06


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR



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