| 摘要 |
Fault protection circuitry for motor controllers includes a soft shutdown circuit and a short circuit protection circuit. Soft shutdown of all six switching devices in a motor controller inverter occurs in the event of a fault condition. Consequently, no additional switching action takes place, avoiding a false turn-on problem due to additional switching and the associated Miller effect. Short-circuit protection circuitry senses the VCE of the IGBT using DESAT circuitry in the gate driver IC. Upon the occurrence of a short-circuit, the IGBT is pulled out of its low on-state voltage and the output characteristics are driven up. DESAT function is provided for each high side IGBT; however, it is enabled only when the IGBT is on.
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