Ditulis Oleh : YK69 Elektro
Judul : Rangkaian Neon Emergency Light Battery 6 volt
Rangkaian Neon Emergency Light Battery 6 volt
This circuit is IC controlled emergency light. This series of automatic switching-on of the light on mains failure and battery charger with overcharge protection. When mains is absent, the relay RL2 is in deenergised state, feeding battery supply to the inverter section via its N / C contacts and switch S1.
Skema rangkaian neon emergency light battery 6 volt
The inverter section comprises IC2 (NE555) which is used in a stable fashion to produce sharp pulses at the rate of 50 Hz for driving the MOSFETs. The output of IC3 is fed to the gate of MOSFET (T4) directly while it is applied to MOSFET (T3) after inversion by gate transistor T2. Thus the power amplifier built around MOSFETs T3 and T4 functions in push-pull mode. The output across the secondary of transformer X2 can easily drive a 230-volt, 20-watt fluorescent tube. In case light is not required to be on during mains failure, simply flip the switch S1 to off position. Battery overcharge preventer circuit is built around IC1 (LM308). Its non-inverting pin is held at a reference voltage of approximately 6.9 volts which is obtained using diode D5 (1N4148) and 6.2-volt zener D6.
The inverting pin of IC1 is connected to the positive terminal of battery. Thus when mains supply is present, Comparator IC1 output is high, unless battery voltage exceeds 6.9 volts. So the transistor T1 is normally forward biased, which energises relay RL1. In this state the battery remains on charge via the N / O contacts of relays RL1 and current limiting resistor R2. When battery voltage exceeds 6.9 volts (overcharged condition), IC1 output goes low and gets deenergised relay RL1, and thus stops further charging of battery. MOSFETs T3 and T4 may be mounted on suitable heat sinks.
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