DRIVER CIRCUIT FOR AN ELECTRIC VEHICLE AND A DIAGNOSTIC METHOD FOR DETERMINING WHEN AN ELECTRICAL SHORT CIRCUIT TO A GROUND VOLTAGE IS PRESENT BETWEEN A CONTACTOR COIL AND A VOLTAGE DRIVER

摘要

A driver circuit and a diagnostic method are provided. The driver circuit includes a first voltage driver, a second voltage driver, and a microprocessor. The microprocessor iteratively measures voltages on first and second sides of a contact to obtain a first plurality of voltage values and a second plurality of voltage values. The microprocessor determines first and second filtered voltage values based on the first and second plurality of voltage values, respectively. The microprocessor de-energizes a contactor coil if both the first filtered voltage value is substantially equal to the second filtered voltage value, and a first filtered current value is less than a threshold current value.