| 摘要 |
A low power switching circuit for delivering electrical power to a load includes a rectifier network connected between the hot leg of the AC utility supply and the earth ground of the utility supply. A neon lamp interposed in the rectifier supply limits the current drawn through the rectifier to less than the 500 mu a code limit for current flow to ground. A high sensitivity, dual coil, bistable relay is connected between the hot leg of the AC supply and the load, which is connected to the neutral leg of the same supply. A capacitor network is connected to the DC output of the rectifier to store sufficient power to operate the relay, and a transistor switching network is connected to deliver the power from the capacitor network to the relay upon receipt of a trigger signal. A "smart" switch such as an area occupancy sensor may be connected to the transistor switching network to provide the trigger signal to cause the relay to switch AC power to the load.
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