Over-voltage Protection circuit using TL431 Shunt Regulator IC
This circuit protects from high voltage. Automatic Equipment disconnect when the power cross the level of a fixed voltage. This is a safety device to overvoltage.
As per datasheet –Â TL431A is the three-terminal programmable integrated circuit. This is a shunt regulator diode. Look like a transistor. This monolithic IC voltage references operate as a low-temperature coefficient zener which is programmable from Vref to 36 V with two external resistors. This device exhibit a wide operating current range of 1.0 mA to 100 mA with a typical dynamic impedance of 0.22Â W. The characteristics references make it excellent replacements for zener diodes in many applications such as digital voltmeters, power supplies, and op-amp circuitry. The 2.5 V reference makes it convenient to obtain a stable reference from 5.0 V logic supplies, and since the TL431, A, B operates as a shunt regulator, it can be used as either a positive or negative voltage reference. Active output circuitry provides a very sharp turn-on.
• Typical Temperature Drift (TL431B) characteristic,
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This is the circuit of over-voltage automatic cut off switch
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Thanks man,
I was screwing around with Voltage monitors for the longest time. This is a much better solution to my problem.
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I have noticed in Solar heating of water with excess panel voltage there is a circuit similar but set up to switch the voltage on when the input reaches a set point . The opposite of overvoltage protection .
Mostly Input is about 65 volts from the panel and it is required to switch power to the water heater when the battery voltage gets to say 58 volts . The MPPT of the controller drops the voltage to what will charge the battery best ,usually about 56 volts so when it all comes up to 58 volts the current is diverted to the water . I have the basics of a circuit using an lm431 but I have not gotten it to work properly yet . Can you help?