AD636 with 0-230 VAC Input

Hi,

I'm building a voltage measurement device for measuring 0-230 VAC input for a light dimmer. I just learnt about Analog Devices AD536 and AD636 ICs. I have the following doubts:

1. I want millivolt precision for detecting voltages; can you provide me with a application note or circuit diagram for converting 0-300VAC to 0-5VDC (I want true rms converter, as waveform is not pure sine).

2. How to 0-230VAC input range be extended to higher range; what modifications are required in the circuit?

Regards,

Ajay.

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  • 0
    •  Analog Employees 
    on Aug 12, 2015 10:03 PM


    Answers to questions above:

    1. AD637 is the most accurate part we have, also the most linear over the widest frequency and input range.

    2. You add the capacitor in series with the resistor, not in parallel. The idea is to isolate the user or load from the HV source.

    3. The AD637 will accept 5vac so long as you have +/-10V or more on the sullies. The AD636 won't.

    4. You need a ground on the connection of the 1k resistor and the low side f the voltage source.

    5. For an ac input of 5V you get 5vdc at the output, for 1vac input, 1vdc out, etc. That is why it's called an rms-dc converter.

    6. Is this an application for a commercial product or are we working on an educational or hobby project?

Reply
  • 0
    •  Analog Employees 
    on Aug 12, 2015 10:03 PM


    Answers to questions above:

    1. AD637 is the most accurate part we have, also the most linear over the widest frequency and input range.

    2. You add the capacitor in series with the resistor, not in parallel. The idea is to isolate the user or load from the HV source.

    3. The AD637 will accept 5vac so long as you have +/-10V or more on the sullies. The AD636 won't.

    4. You need a ground on the connection of the 1k resistor and the low side f the voltage source.

    5. For an ac input of 5V you get 5vdc at the output, for 1vac input, 1vdc out, etc. That is why it's called an rms-dc converter.

    6. Is this an application for a commercial product or are we working on an educational or hobby project?

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