ELECTRONIC CIRCUIT BOARD FOR SOLAR QUARTZ ANALOG
WRISTWATCH MOVEMENT.
BACKGROUND OF THE INVENTION
This Invention relates to a Quartz Analog wristwatch movement.
Currently, Solar powered quartz analog wristwatches available in the market are more expensive and complicated in terms of circuitry design & after sale service. They use round shaped solar panel, that has a stainless steel / Glass base, on which amorphous silicon is coated through Chemical vapor deposit system. A Specially designed Integrated circuit (2.Figl) is used in between the Solar panel (l.Fig 1) and rechargeable battery (3.Figl). Light rays passes through the transparent dial the solar panel (l.Figl) and falls on the P-N junction of the solar panel. This P-N junction in turn generates current that is fed to the rechargeable battery (3.Figl) through the Integrated circuit (2.Figl). The Integrated circuit (2.Figl) takes care of over charging prevention of the battery and also reverse flow of current from the rechargeable battery (3.Figl). The rechargeable battery (3.Figl) thus powers the movement in turn the watch function.
Refer ANNEXURE -1 for Circuit Diagram of other manufacturers
SUMMARY OF THE INVENTION:
The round solar panel (l.Figl) is expensive to fabricate and Laborious to drill a hole in the center. Designing a special Custom built Integrated Circuit is also expensive and time consuming. Hence We at TITAN INDUSTRIES used rectangular solar panels (l.Fig2) where in base material is glass and amorphous silicon is coated on glass surface. Instead of Integrated Circuit we used two Schotty key Diodes (2.Fig2) and one LED (3.Fig2) to prevent over charging and to prevent reverse flow of current. To enhance the charging characteristics we use two Solar panels (l.Fig2) in parallel. So that current flow is doubled.

These two Schottky Diode (2.Fig2) will prevent the reverse flow of current where as LED (3.Fig2) will prevent the overcharging of rechargeable battery (4.Fig2) by breaking the circuit.
Refer ANNEXURE - II for Circuit Diagram of Solar watch designed by Titan Industries Ltd.,
WE CLAIM; ■
1. Over charging prevention circuit is achieved in our circuit using standard electronic
components where as other solar watch movement manufacturers use a separate
Integrated circuit.
2. Usage of rectangular glass based solar panel that is easily available will reduce the
cost to a great extent considerably.
3. Usage of Schottky Diode and LED to prevent the reverse flow of current and
overcharging of Battery is a novel idea and cheaper than specially designed integrated
circuit. Thus ensuring safety to movement and rechargeable battery.
4. Combination of above gives us reliable and cost effective solar driven Quartz analog
wristwatch movement.