| 摘要 |
A fault detector circuit for an electric vehicle control. The circuit is coupled to a power switching device for connecting a load, such as traction motor, to a source of DC voltage. When the conductivity of the power switching device remains high for an unduly long period of time the circuit produces a signal for disabling the control. If the switching device returns to a nonconductive condition within a subsequent predetermined period of time, the disabling signal ceases and a reset circuit is activated, causing it to change state. Should the switching device remain conductive for an undue period for a second time, a disable signal is again produced but the reset circuit, now in its changed state, renders it impossible to discontinue the disabling signal. |
