frequency to voltage conversion

[01795584233]

hello,
I am doing a freq-voltage conversion. But need to design a feedback element in the design loop(f/v converter)to control the frequency. Do anyone have suggestion?. Is there any realisation software to check a digital output(after converting 0-10v to required digital signal through DAC).

Thanks
Senthil

 

[ve7brz]

Hi Senthil,

You need to explain your problem in greater detail. It appears that you're using an FVC and an ADC to drive a digital meter (no micro-P involved), and that you wish to incorporate feedback in order to control the frequency you're measuring. Is this correct?

 

[jbartos]

Suggestion: Normally, the voltage to frequency conversion is produced by converters or transducers. Visit

http://www.national.com/ds/LM/LM231.pdf

http://www.analog.com/technology/dataConverters/voltageToFrequency/app_notes.html

etc. for more info

 

[01795584233]

hello Ve7brz,
Thanks for the reply. yes I need to control the frequency that I'm measuring. The freq is the output from the sensor interface connnected to a AC motor.What element must be incorporated in the feedback loop of thr F/V converter so that I can control the frequency.

Thanks
Senthil

 

[ve7brz]

Sorry Setnhil, but I'm still not clear on this. If the frequency you're measuring is being sensed at a motor controller, is it not logical to vary the speed of the motor? I'm assuming here that you're using a VFD. If this is the case then controlling the motor RPM is quite simple.