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The Projects Forum Working on an electronics project and would like some suggestions, help or critiques? If you would like to comment or assist others with their projects, this is the place to do it.

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  #1  
Old 01-21-2010, 11:15 AM
terrycpl terrycpl is offline
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Default Increase frequency of AC voltage

I am making a Circuit to increase the frequency of AC sinewave voltage with 50 hz.

How Can I increase it from 50 Hz to 80 Hz or above without change the shape of sinewave? (the input voltage is around 5VAC)

Is It using the R,C Circuit?
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Old 01-21-2010, 12:20 PM
3ldon 3ldon is offline
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how you go about this really depends on what you need it for.
it may be best to make a frequency to voltage converter followed by a voltage to frequency converter. because the frequency is so low, it would be cheaper as far as parts count to just hook up a zero crossing detector to a micro controller and use a lookup table to generate the sine wave from PWM.

http://forum.allaboutcircuits.com/sh...ad.php?t=17123
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Old 01-23-2010, 06:20 AM
terrycpl terrycpl is offline
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Quote:
Originally Posted by 3ldon View Post
how you go about this really depends on what you need it for.
it may be best to make a frequency to voltage converter followed by a voltage to frequency converter. because the frequency is so low, it would be cheaper as far as parts count to just hook up a zero crossing detector to a micro controller and use a lookup table to generate the sine wave from PWM.

http://forum.allaboutcircuits.com/sh...ad.php?t=17123

I never use the voltage to freq converter before.
As the input is 5VAC sinwave with 50Hz, it is a AC voltage, and I found that many VFC is only for DC input. Any suggestion IC is good for AC input?


Also, If I want to get the same output voltage , 5VAC but with high freq and above 80Hz, can I get this?

Thanks,
Terry
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  #4  
Old 01-23-2010, 04:20 PM
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Ron H Ron H is offline
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Why do you need this? The solution to your problem depends on your application.
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Old 01-23-2010, 11:17 PM
DC_Kid DC_Kid is offline
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does it need to be clean snewave? i would think a full wave rectifier, chop it at 80Hz, couple it back out to AC. so as others have asked, why do you need 80Hz, whats the application? what's the dependence on the 5vac source?
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Old 01-24-2010, 08:03 AM
terrycpl terrycpl is offline
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Quote:
Originally Posted by DC_Kid View Post
does it need to be clean snewave? i would think a full wave rectifier, chop it at 80Hz, couple it back out to AC. so as others have asked, why do you need 80Hz, whats the application? what's the dependence on the 5vac source?
The final result is to get the Sinewave 5VAC with 80Hz or above.

At the begining , I have a 220VAC with 50Hz,
what I want is to
1. increase the Freq to at least 80Hz without change the shape of sinewave
2. the voltage is decreased to 5VAC.

If using the rectifier, the freq is doubled but it is not sinewave..

I wanna to use the transformer to derease the voltage from 200AVC to 5VAC , then find the analog mulitipler IC AD633 before and want to use multiplication to get higher freq then use AC/AC converter to decrease the voltage again
However, I find that the opearating voltage of this IC is too large for me ,
so, any suggested IC has similiar function with lower opearating of AD633?


Or any method to increase the freq without chnage the shape of sinewave?


I have no time...

Thanks
Terry
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  #7  
Old 01-24-2010, 02:14 PM
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beenthere beenthere is offline
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Can you clarify something? This signal is really in no way related to your line voltage, correct?

Quote:
I wanna to use the transformer to derease the voltage from 200AVC to 5VAC , then find the analog mulitipler IC AD633 before and want to use multiplication to get higher freq then use AC/AC converter to decrease the voltage again
However, I find that the opearating voltage of this IC is too large for me ,
so, any suggested IC has similiar function with lower opearating of AD633?
This statement is very hard to interpret.

It would be helpful to know:

1. What is the intended use of this waveform?

2. You may mean that you wish to increase the voltage after increasing the frequency. What is the final signal voltage?

3. Is the use of an AD633 absolutely necessary?
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Old 01-25-2010, 08:05 AM
terrycpl terrycpl is offline
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Quote:
Originally Posted by beenthere View Post
Can you clarify something? This signal is really in no way related to your line voltage, correct?

This statement is very hard to interpret.

It would be helpful to know:

1. What is the intended use of this waveform?

2. You may mean that you wish to increase the voltage after increasing the frequency. What is the final signal voltage?

3. Is the use of an AD633 absolutely necessary?

Yes..you are correct...Maybe I get the wrong concept to use the AD633 as it only double the signal, not the voltage..and the output current is too low of using this IC...

My project is just to increase the freq of the input sinewave voltage(220VAC, 50Hz) to 80Hz or above......
I think it is the field of power supply, I need to construct a circuit to increase the freq the output sinewave voltage (as the voltage is decreased to 5VAC by using the transformer)

It is the field of power supply...maybe just use some R,C,L....
but I don't know what circuit should be used...
as I find some books..it just tell me the phase shfit of the A.C sinewave or the delay of the sinewave, I didnot find any information what related how to increase the freq of AC voltage....
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  #9  
Old 01-25-2010, 09:26 AM
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THE_RB THE_RB is offline
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You still have not answered the question.

What will the 5v 80Hz be used for? What does it power?
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  #10  
Old 01-25-2010, 09:41 AM
terrycpl terrycpl is offline
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Quote:
Originally Posted by THE_RB View Post
You still have not answered the question.

What will the 5v 80Hz be used for? What does it power?

LED lighting, as 50Hz will make the LED flash, but increased to 80Hz, the LED will not flash.
The book I found is only phase shift of the sinewave..not increase the freq....
No reference I can find...
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