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You are here: Home / Topics / What is the functions of a freewheeling in relays circuit?

What is the functions of a freewheeling in relays circuit?

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Electronics › What is the functions of a freewheeling in relays circuit?

Tagged: diode functions, electirc design, electronics, flyback diode, freewheeling diode

  • This topic has 1 reply, 1 voice, and was last updated 1 year ago by Joey.
Viewing 2 posts - 1 through 2 (of 2 total)
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  • March 13, 2020 at 7:03 am #15593
    Joey
    Participant

    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.
    Freewheeling Diode in a Simple Relay Circuit
    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.

    March 25, 2020 at 2:48 am #15594
    Joey
    Participant

    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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