| 摘要 |
A relay is activated by an A.C. signal that is supplied through two toroids, connected in series to a signal source. The signal is inductively coupled through each toroid and each toroid is controlled by a corresponding microprocessor. A voltage is applied to each toroid to drive it into a saturated state in which the signal is not transmitted through the toroid. The microprocessor supplies a signal to its respective toroid to drive it out of this saturated state. Both microprocessors simultaneously provide a signal that activates the A.C. signal source. Power to the relay is automatically discontinued if either microprocessor fails to provide the required coupling signals to the A.C. source or its respective toroid.
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