In a voltage monitoring apparatus, a capacitor circuit includes at least one capacitor. Input-side switches are connected to electrode terminals of at least one battery cell, and apply voltage to terminals of the capacitor. A voltage detection circuit includes a pair of voltage sensing terminals connected to terminals of the capacitor, and detects the potential difference across voltage sensing terminals. Output-side switches are connected to terminals of the capacitor, and apply voltage across terminals of the capacitor to the voltage sensing terminals. An impedance circuit is connected to the voltage sensing terminals. A stabilizing power circuit is connected to the voltage sensing terminals via the impedance circuit, and stabilizes voltage of the voltage sensing terminals. Based on the detected voltage when one of the output-side switches is turned on, an on-failure of the remaining output-side switches which should not be turned on are detected by a control unit.
Battery voltage monitoring device using capacitor circuit and switch failure detection circuit
2018-11-27
Patent
Elektronische Ressource
Englisch
IPC: | G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES / B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung |