The present invention discloses a relay diagnostic circuit for a number of relays connected in series between an electric vehicle power supply end and a load or a charging end. The relay diagnostic circuit includes a number of voltage divider branches connected to a same reference ground, an isolation unit and a judgment unit. Each of the voltage divider branches is configured to obtain the voltage of one end of each relay and output the voltage after dividing the voltage. The isolation unit is configured to isolate and convert a number of divider voltages output from the number of voltage divider branches and output the voltages to the judgment unit. The judgment unit is configured to compare a comparison information of divided voltages at two ends of each relay with a corresponding driving state of the relay and obtain the diagnosis result of each relay.
Relay diagnostic circuit
2020-12-01
Patent
Electronic Resource
English
IPC: | G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES / 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 / H01H Elektrische Schalter , ELECTRIC SWITCHES |