# very fast switching circuit

Discussion in 'General Electronics Chat' started by blessing mega, Dec 20, 2014.

1. ### blessing mega Thread Starter New Member

Dec 20, 2014
14
0
Please I need a quick switching circuit acting like a change over

Jul 18, 2013
10,859
2,525
Two way switch from Home depot!!

Max.

3. ### blessing mega Thread Starter New Member

Dec 20, 2014
14
0
Yes such that it takes 1 manor seconds to change over

4. ### Alec_t AAC Fanatic!

Sep 17, 2013
5,979
1,138
Do you mean 1 nanosecond?

5. ### GopherT AAC Fanatic!

Nov 23, 2012
6,321
4,048
NanoSecond, microsecond?

Manor second?

Maybe if you tell us what you want to switch over. Your bedroom lights, a little motor, a big motor, a high speed communications system.

6. ### blessing mega Thread Starter New Member

Dec 20, 2014
14
0
An a.c induction motor

7. ### ian field Distinguished Member

Oct 27, 2012
4,459
792
About how long the manor will last with this one tinkering!!!

JWHassler and GopherT like this.

Jul 18, 2013
10,859
2,525
Many other factors involved, e.g. motor to load inertia ratio, this is where rate of acceleration/deceleration is required in order to calculate required capacity of supply etc.
Max.

Jul 18, 2013
10,859
2,525
Another issues is how do you intend to slow the induction motor in order to reverse, external braking or by 'Plugging' the motor via power reversal?
Actually plugging may achieve what you are looking for, all depends on the motor and application.
http://www.electrical4u.com/induction-motor-braking/
Max.

10. ### Alec_t AAC Fanatic!

Sep 17, 2013
5,979
1,138
Why would you want to switch an induction motor in 1 whatsitsecond?

11. ### MikeML AAC Fanatic!

Oct 2, 2009
5,451
1,066
Would you want to reverse an induction motor in less than tens of seconds?

12. ### blessing mega Thread Starter New Member

Dec 20, 2014
14
0
That is because I want to change it's power source

13. ### blessing mega Thread Starter New Member

Dec 20, 2014
14
0
The main idea is this, one power source is use to power my a.c electric motor so I want to change to another power source so that the load the the electric motor is powering is not affected.

14. ### MikeML AAC Fanatic!

Oct 2, 2009
5,451
1,066
How big the motor?
Motor is AC induction motor?
What voltage?
How long after the first power source is switched off will the motor spin due to inertia before you connect the second power source?
If the first and second power sources are AC, are they the same voltage and phase at the moment of switchover?

15. ### blessing mega Thread Starter New Member

Dec 20, 2014
14
0
Datz y I need a change over

Jul 18, 2013
10,859
2,525
'Instant' reversal on a 3 phase induction motor is called 'plugging' the motor, how and when it is done depends on the HP and inertia involved, it can be very stressful on both motor and mechanics connected to motor.
More is required in the way of motor size and/or gearing and mechanism involved.
Max.

cmartinez likes this.
17. ### blessing mega Thread Starter New Member

Dec 20, 2014
14
0
It is a single phase motor

18. ### wayneh Expert

Sep 9, 2010
12,394
3,246
Read it again. I don't think he wants to reverse the motor, he wants to switch power sources seamlessly. Power ORing.

Oct 2, 2009
5,451
1,066