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Questions tagged [vf-fv-converter]

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0
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3answers
673 views

why three phase induction motor draws current with spike at low frequency by using VFD?

I have built Variable frequency drive (VFD) for a three-phase induction motor using V/F constant control. while I was testing 15HP three-phase induction motor without load with my VFD, the motor draws ...
0
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1answer
438 views

Designing a senvitive frequency to voltage converter

I need to make a battery powered frequency to voltage converter that will monitor very minor frequency changes, around 100Hz with base frequency of 3-5MHz (may vary during operation); something like a ...
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3answers
17k views

How do I use pin5 to control duty cycle of a 555 based PWM?

I have built a simple PWM using a 555 IC to drive a motor for an optical chopper and I want to be able to use the output of the chopper signal as a speed correction feedback for the PWM. I think I ...
1
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0answers
2k views

Problem connecting INA114 with LM331 for voltage to frequency conversion

i'm actually using a load cell and i would like to send the load cell information to an android tablet through jack audio. Then load cell caracteristics are presented here: http://www.phidgets.com/...
1
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3answers
386 views

Low power Analog signal Isolation

In my project, the current budget is very tight. With less than 1mA, I have to isolate sensor's signal voltage and be able to measure it with ADC on the other side of the isolation barrier. What I ...
1
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2answers
5k views

Frequency-To-Voltage Convertor With LM2917

I'm trying to make a frequency-to-voltage converter by using LM2917. Its datasheet is very old and it doesn't explain function of the IC well. It just gives several example circuits and a formula for ...