The circuit shown in the figure is a household AC automatic voltage regulator using NAND gates as control components. When the grid voltage exceeds 240V, the NAND gate YFl outputs a high level, VT1 turns on the excitation relay K1, and the S1-1 normally opens the point to reduce the grid voltage by 30V. When the grid voltage is about 220V, the NAND gate YF2 outputs a high level, VT2 is turned on, K2 works, S2-l normally closed point is disconnected and the normally open point is closed, and the voltage obtained by the load is the grid voltage. Similarly, when the grid voltage is lower than 190V, K3 works, the grid voltage is increased by 30V, and the output is still 220V; when the grid voltage is 160V, K4 works, the output is increased by 60V; when the grid voltage is lower than 130V, K4 freed.
The four relays K1 to K4 shown in the figure are all JQX-4 type. Its rated working voltage is 12V, the pull-in current is less than 20mA, and the contact load is 220V, 3A, which can fully meet the general household electricity requirements.
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