| 摘要 |
A drive circuit for a residual current device comprises a transformer having a first and second primary coil each having n1 turns, and a secondary coil having n2 turns arranged to output a drive voltage responsive to any current imbalance between the respective electric currents flowing in the first and second primary coils. In order to achieve as high a drive voltage as possible the transformer is arranged to saturate at a relatively low level of current imbalance thus causing the back-EMF voltage generated across the secondary coil to spike resulting in a low power high voltage drive signal being output. Preferably, the secondary coil output is rectified, smoothed, and multiplied before being used as a drive signal for an active material bender used as an actuator in a circuit breaker mechanism. |
