| 摘要 |
<p>The present invention discloses a driver circuit and a diagnostic method. The driver circuit includes a first voltage driver, a second voltage driver, and a microprocessor. The microprocessor generates a first pulse-width modulated signal inducing the first voltage driver to output a second pulse-width modulated signal energizing a contactor coil. The microprocessor sets a first diagnostic flag equal to a first value if a first filtered voltage value is greater than a first threshold value. The microprocessor sets a second diagnostic flag equal to a second value if a second filtered current value is greater than a second threshold value. The microprocessor stops generating the first pulse-width modulated signal to de-energize the contactor coil if the first and second diagnostic flags are set equal to the first and second values, respectively. [Reference numerals] (117) Vehicle control unit; (170) Microprocessor; (90) Inverter; (91) Electric motor</p> |
