| 摘要 |
<p>A control device and system for an appliance and methods of making the same are provided, the control device (25) having a control unit to energize the coil (29) of a relay (K2) with a power source (21) at substantially a desired lead point on the voltage wave cycle thereof, the control unit having a sensing unit to sense a lag time by detecting when the coil current of the relay coil (29) decreases momentarily by the contacts (30) initially closing and a unit to automatically adjust the desired lead point should the sensed lag time on a certain previous cycle of operation not cause the contacts to close, and the sensing unit comprising an indicating transistor (Q9) in the circuit.</p> |
