Uninterruptible power supply unit, 220 W. 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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The uninterruptible power supply provides output power up to 220 watts. In the circuit (see figure) and the voltage of the lead car battery GB1 is applied to the master oscillator on the DD1 chip with a frequency of 50 Hz, which swings powerful key transistors, alternately applying 12 V to the windings la and Ib of the step-up transformer T2. From the secondary winding T2, a voltage of 220 V. with a frequency of 50 Hz is supplied to the load. When the mains voltage appears on the X1 connector, the K1 relay is activated, which switches the power supply to the GB1 battery automatic charging mode.
(click to enlarge)
Transformer T1 can be used with any power of at least 10 W, providing a voltage of at least 20 V on the secondary winding. Transformer T2 must have two identical windings of 10 V and 10 A.
Set up the automatic charge assembly as follows. Connector X1 is not connected to the network. Instead of a battery, a stabilized DC source with an adjustable output voltage is connected, which is set by a voltmeter equal to 14,5 V. The trimmer P1 is set to the lower position according to the diagram, and the trimmer P2 is set to the upper position according to the diagram. In this case, the transistors must be locked, and the relay K2 is de-energized.
Slowly rotating the axis of the trimmer P2, the relay is activated. Then, a voltage of 12,6 V is set on the power source and, by slowly rotating the axis of the trimmer P1, the relay is released.
Author: K.F.Ulyanych, Uman, Cherkasy region.
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