| 摘要 |
<p>A motor controller operable at a PWM (pulse width modulated) repetition rate above 6000 Hz is disclosed. A special saturable transformer with an interwinding capacitance of less than 5 picofarads is used to isolate the electronic control circuits from the power stage. PWM pulses are supplied to the saturable transformer such that the leading and trailing edges of the pulses pass through to a Schmitt trigger circuit which reconstructs the original pulse. In a preferred embodiment, the power supplies for the power transistors and gate drives are isolated from the power supplies for the electronic control circuits. Each of the gate drives for the IGBT power transistor is supplied through a separate floating supply. Power supplies for the digital components and the analog components have separate ground return paths and are tied together at the supplies. <IMAGE> <IMAGE></p> |
