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alex36
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Why reverse diode is used in relay ?? In my book its written that ,to protect op amp from damage but how does it protects?
alex36 said:Why reverse diode is used in relay ?? In my book its written that ,to protect op amp from damage but how does it protects?
CWatters said:In your relay circuit the high voltage can cause damage. The diode prevents the voltage going very high by limiting it ("clamping it") to around Vd = 0.7V. The diode is sometimes called a clamp diode, a freewheeling diode or a flyback diode...
A diode is a semiconductor device that allows current to flow in only one direction. In a relay, the diode is used to protect the op amp by providing a low resistance path for the reverse current that is generated when the relay coil is turned off.
The op amp is a sensitive electronic component and can be damaged by high voltage spikes that occur when the relay is turned off. Using a diode to protect the op amp can prevent damage and ensure the proper functioning of the circuit.
When the relay coil is turned off, the magnetic field around it collapses, causing a voltage spike in the opposite direction of the current flow. This spike can damage the op amp, but the diode provides a low resistance path for the current to flow through, protecting the op amp.
No, not all diodes are suitable for use in a relay circuit. It is important to choose a diode with a fast switching speed and a high reverse voltage rating to effectively protect the op amp.
Yes, in addition to using a diode, a TVS (transient voltage suppressor) diode can also be used to protect the op amp from voltage spikes. This type of diode has a higher voltage rating and can handle larger spikes than a standard diode.