Controller for minimum and maximum voltage. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Protection of equipment from emergency operation of the network, uninterruptible power supplies
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A scheme of automatic load disconnection based on the minimum and maximum allowable voltage is proposed.
(click to enlarge)
The operating threshold for the minimum voltage is adjusted by potentiometer R3. The operating threshold for maximum voltage is adjusted by potentiometer R11. The circuit requiring protection is connected to connector J1. The operating voltage range is determined by the parameters of the transistors.
The circuit is designed for a nominal voltage of 15 volts, the lower threshold is 14 volts, the upper threshold is 17 volts. If you plan to work with loads of about 5 amperes, it is advisable to install the Q4 transistor on a small radiator.
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