A battery charger of an electric vehicle has a relay controllably connecting and separating an AC source and an internal power line. When starting up the battery charger, before first commanding the relay to close, voltages are measured on an input side of the relay, connected to the AC source to receive; and on an output side of the relay, connected to the power line, when the output side is electrically isolated from the input side due to the relay being in its open state. If there is a difference between these measured voltages that is greater than a threshold value, a capacitor coupled to the power line is charged. After the capacitor is charged, then the command to close the relay is issued. Upon the relay closing, the battery charger circuit charges the battery via the power line using the incoming AC power.
SYSTEMS AND METHODS FOR SMOOTH START UP OF VEHICLE ONBOARD BATTERY CHARGER
2024-08-08
Patent
Electronic Resource
English
IPC: | 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 / 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 , Anlagen zur Umformung von Wechselstrom in Wechselstrom, von Wechselstrom in Gleichstrom oder umgekehrt, oder von Gleichstrom in Gleichstrom und zur Verwendung in Netzen oder ähnlichen Stromversorgungssystemen |
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