In the relay driver circuit, always has
a diode parallel with coil,
WHY?
Counter-Electromotive Force (CEMF) is a voltage developed in an inductor network
by a pulsating current or an alternating current. The voltage's polarity is at every
moment reverse that of the input voltage, therefore opposes the change of main
current flow in the circuit it is called counter-electromotive force (CEMF). The CEMF
is then given by:
(the ‘–’ sign means polarity reverse)
Where i is the current, T is time and L is the inductance (L1101) of the circuit. When
the ‘dt’ is very and very small the CEMF (voltage) will become extremely high.
If diode (D1107) is defected it can cause damage to peripheral components
What is CEMF?
POWER SUPPLY 3/5
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