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According to the structure and working principle of the electromagnetic relay, it has a coil as an electromagnet. After the current is applied, the coil generates a magnetic field to attract the armature, and finally the contact connected to the armature is switched, which is equivalent to an inductance. According to Lenz’s law, an inductor generates an induced electromotive force to block the change in current.
When an inductor with current flowing cuts off the power supply, the interruption of the external power supply causes the inductor current to drop, and the inductor will hinder the process of this current drop, so a self-inductive voltage will be generated to try to maintain the current without abrupt changes. However, due to the difference between the high and low levels of the control signal, the magnitude of the self-inductive voltage is also different. So what is the purpose of the freewheeling diode in the relay circuit?
Is there anyone can answer for me, thanks in advance.Actually I ask this questions as example analysis for my technical articles. I have listed some important functions of freewheeling diodes in the circuit, but it is not enough to be professional, as a new editor.
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