To protect the switch from being damaged due voltage spikes or inductive flyback a flyback diode or a freewheeling diode is used. Its called a freewheeling diode.
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In motor control circuits a diode known as the freewheeling diode is connected across motor terminals to allow for dissipation of energy stored in motor inductance and to provide for continuity of motor current when the scrs are blocked.
Diode and freewheeling diode. Freewheeling diode used in the power circuits which drives the inductive load. This diode is known by many other names such as kickback diode snubber diode commutating diode freewheeling diode suppression diode clamp diode or catch diode. A freewheeling diode is basically a diode connected across the inductive load terminals to prevent the development of high voltage across the switch.
The other names of freewheeling diode are flyback diode clamp diode snubber diode suppressor diode etc. Begingroup the diode is a really good idea. This is due to the continuous circulation of current in the diode and the relay coil.
The basic idea behind the use of a flyback diode is to provide an alternative path for the inductor for its current to flow. In short the diode takes the energy stored in the relays coil when you switch the current off. Such semiconductor switches are diodes transistors bjtmosfetigbt thyristors etc.
A freewheeling diode is a protective diode. When the inductive circuit is switched off this diode gives a short circuit path for the flow of inductor decay current and hence dissipation of stored energy in the inductor. It is used in circuits in which inductive loads are controlled by switches and in switching power supplies and inverters.
This answer covers the details and thats why i put this as a comment only. It is also known as flyback diode and forms connection across the inductor to remove flyback voltage generated across it. Freewheeling diode flywheel diode may cause delay drop put of contacts when the power is removed and dc coil relay is used.
The above image shows the same inductor circuit but with additionally a flyback diode. Freewheeling diode is used to protect the circuit from unusual damage caused due to abrupt reduction in the current flowing through the circuit. In the above figure we connect a diode across the load at the left side in the picture.
This diode is also called flywheel or flyback diode. Freewheeling flyback diode definition. It also provides protection against transient over voltages.
We use this diode only for protecting the semiconductor switches. Freewheeling diode freewheeling diode is nothing but a normal pn junction diode. What is freewheling diode.
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