Why a Diode is Used with a Relay ? Why a Reverse Polarity Diode is Mandatory with a Relay?

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Опубликовано:

6 ноя 2021

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Комментарии : 71

@jluke6861 6 месяцев назад

Thank you for sharing this great video.

@GAURAV_DEY. Год назад

This video proved very helpful to me regarding which diode to use Thank You for this

@RGInnovations Год назад

thank you. please subscribe.

@yourtakingmylife3472 2 месяца назад

Thanks. That explained a lot. Keep up the awesome videos. You explain things very well. That way even someone like me (who doesn't know much about electronics, I'm just trying to fix something of my own), can understand and grasp the concept.

@RGInnovations 2 месяца назад

Thank you for valuable comment.

@Vijaykumar-ff3rh Месяц назад

Nice explanation ❤

@RGInnovations Месяц назад

Thank you

@sabbirahmedsaad6351 2 месяца назад

Excellent explanation brother. Keep up the good work.

@RGInnovations 2 месяца назад

Thank you

@paulelkouss 5 месяцев назад

Great video!

@RGInnovations 5 месяцев назад

Thank you

@marthareddy9554 2 года назад

Excellent

@RGInnovations 2 года назад

thank you..

@kabandajamir9844 2 года назад

So nice

@RGInnovations 2 года назад

thank you..

@sshvulnerability 2 года назад

If you have an input/trigger voltage that can be positive or negative (say existing dc controller for forward and reversing a brushed motor for example) how can you use a relay or relays to trigger the correct polarity on output of the relay?

@RGInnovations 2 года назад

In motor controller modules, there are internal flyback voltage controller, so need not to use separate diode.

@uditsaxena3844 Год назад

Thanks

@RGInnovations Год назад

welcme

@sainath8710 11 месяцев назад

Hi, very nice and informative video. Want to know whether can use the same diode for and any 12v relay?

@RGInnovations 11 месяцев назад

Yes, IN4007 can be used.

@sainath8710 11 месяцев назад

@@RGInnovations okay. Thanks for the reply.

@danielbonner8309 5 месяцев назад

Im down the diode rabbithole. Installing a lightbar in my truck. Why wouldn't these wire harnesses not have them included

@RGInnovations 5 месяцев назад

Sorry could not understand what you wanted to say

@1windozesuk 3 месяца назад

It seems most automotive 12v relays made in China and sold on Amazon don't have a diode in them and light bar sellers are including these with their kits. 12v automotive relays (Bosch style, I think) with diodes are harder to find now and I see them for like $25 for a single relay vs $12 for a 10 pack without diode. I took diodes, shrink tube and double male to single female blade terminals and made little diode jumpers to go across the coil connectors on those relays to compensate. So try that. However, on a light bar I have, the cheap rebranded Amazon type, it causes a lot of interference when switching on and off.

@danielbonner8309 3 месяца назад

@@1windozesukI ended up getting a Bosch relay with a diode for like $20 llke you said. Definitely feel more comfortable with that protecting backflow into my trucks electrical system. I debated just buying a pack of diodes and wiring it in, thats definitely the cost effective way to go.

@reedy8585 Год назад

So I have a 230v coil relay and a 10amp 1000v silicone rectifier diode for flyback but , this just blows the fuse on whatever power source I use to switch the relay, do you know what I'm doing wrong ?

@RGInnovations Год назад

What load are you using with the relay?

@marekkrhutek8587 2 года назад

Is it recommended to always connect diode to the relay, or are there some cases where it is not necessarily?

@RGInnovations 2 года назад

you should use a diode with any dc inductive coil load.

@marekkrhutek8587 2 года назад

@@RGInnovations Ikr, the problem im facing is that there is voltage drop of around 1V on the coil of the relay, adding diode with another voltage drop of 0.7v is no good since I have multiple of these in my circuit. How would you deal with this problem? (the power supply is 12V and im using 12 pcs of 18650 batteries)

@utkarshmishra3961 Год назад

I am also using this method but I wanted to de energize the 12v relay faster. How can i do that?

@RGInnovations Год назад

It is the fastest way

@veni-s3g День назад

also sir why cant we use resistor if the only need is to provide low resistance path to current?

@RGInnovations День назад

Resistor will continuously flow current, so it will heat up and burn.

@roysgaming9509 5 месяцев назад

Dear sir , Your video is very informative. But if this video you can make with hindi language it is more effective & u can have more reach. Thank you sir.

@shrikantsawant1810 7 месяцев назад

Nice info sir I want to know even across coil also diode is connected

@RGInnovations 7 месяцев назад

Not all coils require a diode, but it's common to use a diode with coils in certain circuits. Coils, particularly inductive loads like relays or solenoids, can produce voltage spikes when the current flowing through them is suddenly interrupted.

@asooose 7 месяцев назад

what diode should i use for a 5v relay?

@RGInnovations 7 месяцев назад

1N4007

@ryankern7077 Год назад

Is this a type A, B, or C relay?

@RGInnovations Год назад

Type C

@gauravdhiman7528 Год назад

Hello sir, I want to drive a water pump of around 1/2 kw from a input of 12v DC from a washing machine solenoidal input valve. Bcz I m facing water pressure issues. So I want to run pump as machine take water and automatically shut the pump as it stop to take water. So pls can you tell me detail circuit diagram for it or this same circuit will work for it

@RGInnovations Год назад

use a 220v 15amp relay

@gauravdhiman7528 Год назад

@@RGInnovationswill rest of thing be same in circuit except relay ?, Sir may you pls tell a brief information about my issue,, if possible....

@gauravdhiman7528 Год назад

Bcz I m novice about electronic. I try to learn it by it own through DIY work

@RGInnovations Год назад

yes, use a diode in the opposite polarity of the power supply...

@gauravdhiman7528 Год назад

@@RGInnovations thankyou sir. I appreciate your channel and you prompt action on my query. ...

@shadoworkz123 Год назад

Is it normal for a relay to heat up when coil is energized for long run?

@RGInnovations Год назад

usually does not heat if applied rated voltage and current

@shadoworkz123 Год назад

@@RGInnovations the relay is rated at 12v 80a. My battery pack when charged is around 16v. Is that the issue?

@RGInnovations Год назад

yes

@shadoworkz123 Год назад

@@RGInnovations ok thanks.

@ashimshekh8263 Год назад

24v relay me konsa dioade lagega?

@RGInnovations Год назад

1N4007 will do.

@tahaariaz Год назад

i have a question, when we install a relay in the car or any automotive, nobody put diode in it. Won't there be a problem?

@RGInnovations Год назад

car relays are usually connected with switches, in such cases, diode not required.

@tnamen1307 7 месяцев назад

@@RGInnovationscan you please explain why using switches does not require the use of diodes in car relays?? I myself also wonder the relays used in automotive vehicles doesn't employ diodes at all. How does it work then?

@RGInnovations 7 месяцев назад

If there is any delicate circuitry used, then there must be diode installed, else the circuit would damage

@tnamen1307 7 месяцев назад

@@RGInnovations thanks for the reply... One more confusion... When the circuit in the video is closed, the back emf voltage is created with reverse polarity. But, how does the back voltage flow from reverse direction entering the positive side of the diode and coming out of the cathode whose end is basically connected to the original source voltage 12V? Does it mean that the source voltage acts as a SINK when reverse voltage is happening? How does the back current flows from LOWER side to higher side? Doesn't a current always flow from high potential to lower potential?

@RGInnovations 7 месяцев назад

Please do not mix voltage and current. When we supply 12volt, the current may be 500ma, or 1A, or 2A, but the voltage generated from relay is much higher and current is very very less, say some microamps. Since the generated voltage is AC, it does not depend on the diode polarity. It does not even reach to the DC power source, since the distance between the relay and diode is very less, obviously lesser than the distance of battery, it neutralizes the reverse voltage.

@MuhammadYaseen-vx5hw 2 года назад

please keep your video language in urdu hindi. we can measure the back current with dmm that how much volts are back.

@RGInnovations 2 года назад

the back current flows for very small amount of time, dmm may not be able to monitor such small time. you can measure with DSO.

@veni-s3g День назад

but sir isnt the diode is already built-in?

@RGInnovations День назад

No the diode is not built in.

@veni-s3g День назад

@@RGInnovations ohh ok sir.....no its just that i have seen a vedio where it is said that the relay switch,diode and the coil are a complete module built inside!

@RGInnovations День назад

If it's a module then diode should be there, but in a single relay, diode is not built in.

@veni-s3g День назад

@@RGInnovations ohhok sir thank you