Why DIODE used in RELAY for Flyback voltage | Explain in Bangla

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Engineering Science & Technology - EST

Engineering Science & Technology - EST

2 жыл бұрын

Why Put a Diode Across a Relay Coil?
When the power supply is connected to the relay, the inductance coil’s voltage builds up to match that of the power source. The speed at which the current can change in an inductor is limited by its time constant. In this case, the time it takes to minimize current flow through the coil is longer than the time it takes for the power supply to be removed. Upon disconnection, the inductive load in the coil reverses its polarity in an attempt to keep current flowing according to its dissipation curve (% of maximum current flow with respect to time). This causes a huge voltage potential to build upon the open junctions of the component that controls the relay.
This voltage built up is called flyback voltage. It can result in an electrical arc and damage the components controlling the relay. It can also introduce electrical noise that can couple into adjacent signals or power connections and cause microcontrollers to crash or reset. If you have an electronics control panel that resets each time a relay is de-energized, it’s highly possible you have an issue with flyback voltage.
To mitigate this issue, a diode is connected with reverse polarity to the power supply. Placing a diode across a relay coil passes the back electromagnetic field and its current through the diode when the relay is energized as the back EMF drives the flyback protection diode in forwarding bias. When the power supply is removed, the voltage polarity on the coil is inverted, and a current loop forms between the relay coil and protection diode; the diode again becomes forward biased. The freewheeling diode allows current to pass with minimal resistance and prevents flyback voltage from building up, hence the name flyback diode.
What Is a Flyback Diode and Why You Need It
If you’ve been creating printed circuit boards that feature mechanical relays, then you probably have heard of flyback diode. A flyback diode or freewheeling diode is placed with reverse polarity from the power supply and in parallel to the relay’s inductance coil. The use of a diode in a relay circuit prevents huge voltage spikes from arising when the power supply is disconnected. A flyback diode is sometimes called flywheel diode, freewheeling diode, relay diode, or snubber diode as a flyback diode circuit is a type of snubber circuit.
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Пікірлер: 33
@AvijitMukherjee-bf3tf
@AvijitMukherjee-bf3tf 3 ай бұрын
খুব ভাল experiment. 😊
@islamaiatul5763
@islamaiatul5763 Жыл бұрын
Good Experiment ❤thanks bro:
@tanbirrimon7078
@tanbirrimon7078 3 ай бұрын
ভাই এইভাবে সিম্পল করে একটি অটো কাট সার্কিট তৈরি করে দেখান...
@ashrafuzzaman2183
@ashrafuzzaman2183 Жыл бұрын
Informative video, thanks
@imamhossain6143
@imamhossain6143 4 ай бұрын
Vai DC to DC line e 12v 8pin relay kivabe use korbo? R polarity hisebe ki use korbo?
@abulkashem9321
@abulkashem9321 2 жыл бұрын
আপনার ভিডিওটি খুব ভালো লেগেছে। আপনি ডায়োডটি উল্টো করে কিভাবে লাগবো যদি একটু ক্লিয়ার করতেন?
@engineeringsciencetechnology
@engineeringsciencetechnology 2 жыл бұрын
রিলে কয়েলের পজেটিভ প্রান্তে ডায়োডের ক্যাথোড প্রান্ত যুক্ত করবেন। অ্যানোড প্রান্ত গ্রাউন্ডের সাথে।
@md.raihan3656
@md.raihan3656 11 ай бұрын
ভাইয়া রিলে কয়েল যদি আলাদা পাওয়ার সাপ্লাই থেকে,আর কমন টা যদি ব্যাটারী থেকেদেওয়া হয় তাহলে কি ডায়োড লাগবে
@mdmillat1238
@mdmillat1238 2 жыл бұрын
ভাই আমি bms দিয়ে একটি বেট্যারি বানিয়েছি কিন্তু কিছুখন চলার পর একা একা ডিসকানেক্ট হয়ে যায় পরে মিটার দিয়ে মেপে দেখি নেগেটিভ প্রিন এ সমস্যা তাই আমি সট করে bms এর আউটপুট এ লাগিয়ে দেই এখন চলে এতে কী কোন সমস্যা হবে?
@engrfokrulislam173
@engrfokrulislam173 Жыл бұрын
thnks
@bdpplzabdullah7266
@bdpplzabdullah7266 2 жыл бұрын
good video clear holam
@engineeringsciencetechnology
@engineeringsciencetechnology 2 жыл бұрын
Thank you vaiya
@SaifulIslam-pg2jx
@SaifulIslam-pg2jx 2 ай бұрын
ভালো
@dilaraparvin-ch7qo
@dilaraparvin-ch7qo Жыл бұрын
Valo.
@arifchy4627
@arifchy4627 Жыл бұрын
Nice to dbo
@angshistudio354
@angshistudio354 Жыл бұрын
Bhai ami relay dia ac te fan chalabo abong curent chale gele abar dc te chalbe tahole ami kivabe relayte connection korbo please bhai akta vidior link diben amake
@Enamul_Haque1275
@Enamul_Haque1275 2 ай бұрын
ভাই কয়েকটা ফ্রি হুইলিং ডায়োড এর নাম লাগবে যেটা ডিসি লাইন এ ৬ এম্পিয়ার কারেন্ট বহন করতে পারে
@Habiburlira
@Habiburlira 5 ай бұрын
ভাই রিলে দিয়ে অটো সার্কিট বা আইপিএস 5v
@MdRashedul-mo4oy
@MdRashedul-mo4oy 7 ай бұрын
❤❤❤❤
@ranzusarker3694
@ranzusarker3694 10 ай бұрын
3.7 ভোল্টের ব্যাটারির অটো সার্কিট তৈরি করে দেখান
@asimhalder8606
@asimhalder8606 Жыл бұрын
Supar
@bdpplzabdullah7266
@bdpplzabdullah7266 2 жыл бұрын
এসি রিলেতে ও কি ফিডব্যাক voltage curcuit a চলে আসে ? এসি রিলেতে ও ki diode লাগাতে হবে ?
@engineeringsciencetechnology
@engineeringsciencetechnology 2 жыл бұрын
Asleo somossa nei karon ac relayer er sathe kom voltage er kono components thakena
@sumenchoudhury3861
@sumenchoudhury3861 2 жыл бұрын
diode ta ki ++ & -- kore lagate hobe naki + - kore lagate hoy?
@engineeringsciencetechnology
@engineeringsciencetechnology 2 жыл бұрын
+ - hobe mane ulto
@skylinebluesky7771
@skylinebluesky7771 3 ай бұрын
Incomplete tutorial
@sheikhakash325
@sheikhakash325 Жыл бұрын
ভাই আপনার ফোন নাম্বার টা দেওয়া জাবে কিছু কথা ছিল
@doktok7405
@doktok7405 Жыл бұрын
এটা কি অটো চার্চ হবে
@engineeringsciencetechnology
@engineeringsciencetechnology Жыл бұрын
Na vai
@subrotodebnath7132
@subrotodebnath7132 2 ай бұрын
hi
@rakhalitv2935
@rakhalitv2935 2 ай бұрын
একেকজন একেক নিয়মে করলে কিছুই বুঝা যায় না
@md.mizanurrahaman-ev2jv
@md.mizanurrahaman-ev2jv 3 ай бұрын
ডায়োডটি লাগিয়ে দেখাতে পারতেন। এত অলস আপনি?
@NazmulIslam-ss6di
@NazmulIslam-ss6di 3 ай бұрын
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