Stand-by POWER loss preventer

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introduction

Stand-by power loss preventer is a device which prevents the power during when the system is on stand-by mode. It is based on the principle of electromagnetic induction (EMI is used to activate and de-activate the circuit). It mainly works on the CRT(cathode ray tube).


Working

The circuit senses high-energy electromagnetic radiation from the CRT monitor when it is ‘on’. A relay coil (L1) connected between inverting pin 2 and non-inverting pin 3 of IC CA3130 (IC1) senses the electromagnetic radiation from the monitor to generate a minute current. IC CA3130 is CMOS op-amp with gate-protected p-channel MOSFET in the inputs. It has very low input impedance & requires very low input current (typically, 5pA). The high input impedance and low input current make IC1 suitable for this application. The internal bias of IC1 at 5pA is sufficient is not required. Preset VR1is used for offset null adjustment so that the output of IC1 is low when the TV is in the standby mode .



advantages


Eliminating "standby" electricity loss from home appliances could save upto 25 percent on electrical bills, study shows.
It save 45% of the main power supply.
When the TV is on standby mode our system get automatically switch ON & allow the required power to flow through the electronic device.
Due to the use of IC, the circuit is minimized.
Durable & long life.



disadvantages


When the device is in stand-by mode, the efficiency of the relay decreases due to the fluctuation in the magnetic field generated by the relay.
It can be used only in CRT contained devices & not in LCD etc.
Its circuitry is complicated.
It is expensive.
Effected by weather condition.