Three State Voltage Indicator circuit

Published:2012/9/28 21:02:00 Author:muriel | Keyword: Three State, Voltage Indicator | From:SeekIC

This is an ideal circuit to monitor the Voltage level in 12 volt Lead Acid batteries used in Inverters .For the perfect operation of Inverters, the battery voltage should be between 12 and 13.5 volts. A fully charged battery shows 13.5 volts. If the voltage reduces below 10 volts, the Inverter will not give back up. Moreover, if the Inverter is continuously charging without attaining 13.5 volts, it indicates that the battery is not accepting and holding charge.The circuit is too simple and uses only a few components. It shows three indications. 1. If the battery has 13.5 volts, Green half of the bicolor LED lights.2. If the battery has 12 volts(Normal) LED will be Off3. If the battery voltage reduces below 10 volts, Red half of bicolour LED lights. About the Semiconductors The important components of the circuit are a two lead type bicolour LED and the Operational Amplifier CA3140. Bicolour LED The Bicolour LED used in the circuit is a Two Lead type. That is, it can give Red or Green lights based on the polarity of the leads. If the leads are connected in one direction, it gives one colour and if the leads are reversed, it gives the second colour. Thus there is no Anode- Cathode arrangement. Both the leads can function as Anode and Cathode. The internal arrangement of the LED automatically changes the direction of current based on the polarity. Here the LED used gives Red and Green colours. BIcolour LED Datasheet CA3140This Operational Amplifier is a 4.5 MHz BiMOS Op Amp with gate protected MOSFET inputs and Bipolar output. Its inputs have very high input impedance (1.5T Ohms).It require very low input current (10pA) and hasvery high speed of performance. The IC can operate between 4 – 36 volts with single or dual power supply.CA3140 is internally phase compensated for stable operation



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