Scheme of power supply of electronic clock from the network. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Scheme of power supply of electronic clock from the network. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Power Supplies

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The technical literature describes blocks for power supply from the electrical network of electronic-mechanical alarm clocks. The blocks that replace the 1,5 V galvanic cell contain a rectifier with a voltage stabilizer and an isolating-lowering transformer. The stabilizer eliminates drops in the supply voltage during rare increases in load at the moment the signal electro-acoustic converter (bell, electric buzzer) is turned on. An isolating-step-down transformer is required under the terms of electrical safety engineering.

I believe that to power an electronic-mechanical clock without a signal electro-acoustic converter, an electric bell or a buzzer, the power supply unit can be greatly simplified. Due to the negligible current consumption of the clock, it is possible to use a symmetrical transformerless circuit (see figure) with step-down capacitors C1 and C2 of very small capacity (0,033 μF 200 V type BGM-2), which make the electrical wires going to the clock safe. What is not in [1,2].

Scheme of power supply of electronic clock from the network

There may be no stabilization in the block, since the clock does not have an electric bell or a buzzer, and voltage fluctuations in the mains are insignificant and do not significantly affect the accuracy of the course. In addition, the periods of decrease and increase in voltage in the mains are approximately equal in length of time, which causes mutual compensation of the slowdown of the clock by its acceleration and vice versa.

Capacitors C1, C3 and resistor R1 (1 kOhm type VS-0,125 W) can be placed in a special electrical plug plugged into the power outlet, and diodes and capacitor C2 (470 μF 6,3 V type K50-24) - in an overall case inserted into the watch compartment instead of galvanic cells. Other options are possible. The required voltage at the output of the unit is achieved by specifying the resistance value of the resistor R1 with the clock on and normal input voltage. Diodes type KTs407A. I used the D1A scheme.

When powering devices that consume a relatively large current, the galvanic cell 373 eventually stops working due to a relatively increased internal resistance. The voltage it gives out begins to drop almost entirely on this resistance. If such an element is used to power an electronic-mechanical clock that consumes relatively small current pulses, then it can provide their power supply for a long time.

To do this, before installing the element in the clock, in parallel with the contacts of its inclusion in the power supply compartment, it is necessary to connect a small-sized oxide capacitor with a capacity of 100 microfarads with an operating voltage of 6 V, observing the polarity. This capacitor will eliminate the voltage drop of the element at the time of load peaks. The location of the capacitor is arbitrary and depends on the dimensions of the watch.

Literature

Radioamator - 1995, No. 7, p.5.
Radio hobby - 1998, No. 2, p.45.

Author: A.Pochtarik. Artemovsk, Donetsk region

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