Power supply for electromechanical watches. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Power Supplies
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Who has a similar watch, this power supply is not a replaceable thing. If there is voltage in the network, the clock is powered by it during positive half-cycles, and during negative half-cycles - by the energy stored by the battery G1 and capacitor C3. When the mains voltage fails, only the battery becomes the power source, the energy of which is enough for several days and even weeks of continuous operation of the clock - depending on the value of the current they consume.
Capacitors C1 and C2 perform the function of ballast, extinguishing excess voltage in the network. With a negative half-wave of the mains voltage on the upper (according to the circuit) wire, the VD1 diode will open and capacitors C1 and C2 will be charged through it. With positive half-waves, the capacitors will begin to recharge, the current will flow, first of all, through the open diode VD2 and the battery G1 and capacitor C3 will start charging. The voltage of a fully charged battery will be at least 1.35 V, and on the HL1 LED - about 2V. Therefore, the LED will begin to open and thereby limit the charging current of the battery. Therefore, the battery will always be in a charged state. Resistor R1 serves to discharge capacitors C1 and C2 when the device is disconnected from the mains.
Capacitors C1 and C2 are film capacitors for a nominal voltage of at least 300 V, C3 is an electrolyte (preferably tantalum). Diodes VD1 and VD2 - any rectifier small. The HL1 LED must be selected such that the forward voltage at a current of 10 mA will be 1.9 ... 2.1 V. The battery is nickel-cadmium D-0.1, better D-0.125.
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