Re: AC Line Monitor and/or Opto Coupler for 3.3v board


ElderUberGeek wrote:
> I am looking for a component that will alow me to bring a "hot"
> 230v (but also less, down to 10v) on to my microcontroller board by
> detecting the presence of the signal, isolating it, and converting it
> to DC logic levels. I thought of using a "standard" opto coupler, but
> understand there are some dedicated components for this application?
> (AC Line Monitor?). Some of my signals are just change in state of a
> line (i.e. 230v present or not, and the changes are long in between)
> while others are up to 200KHz AC signals.
>
> Specifically, I am looking for a component that would work good on my
> 3.3v board uC (I found one for 5v but I want to use only 3.3v).
>
> Thanks

Use a Transformer to step down the 230 volts to 10 volts this must be a
fair sized transformer to handle 230 volts AC. then push the 10 volts
through a risistor network to bring the voltage to the propper values
Next use a schmidt trigger to look for voltage changes the trigger will
output 5 volt and 0 volt logic high and low pulses to represent the
incomming signal when it is triggered at its turn on and turn off
points. This should satisfy your board feed and provide you with a
logic clock pulse that represents the insomming 230 volt signal
regardless of frequiency. This requires you to build the device
yourself and choose the propper component values.

.

Relevant Pages

  • Re: Practical implementation question
    ... To handle bipolar signals, my interface hardware introduces a zero input offset of 1.5 volts, which represents the midpoint of the conversion range and scales the inputs into the 0 to 3 volt range. ... negative polarity signals appear at the input of the converter between 0 and 1.5 volts and positive polarity signals are between 1.5 and 3 volts. ... complement, postivive and negative representation. ...
    (comp.dsp)
  • Re: Kaypro II repair
    ... volts adds that the 5 volt power ... to look at logical signals. ... even if the AC meter "says" 8 volts" there is NOT ... transitions of address, data, and control lines were clearly indicated by ...
    (comp.os.cpm)
  • Re: Practical implementation question
    ... To handle bipolar signals, my interface hardware introduces a zero input offset of 1.5 volts, which represents the midpoint of the conversion range and scales the inputs into the 0 to 3 volt range. ... negative polarity signals appear at the input of the converter between 0 and 1.5 volts and positive polarity signals are between 1.5 and 3 volts. ... complement, postivive and negative representation. ...
    (comp.dsp)
  • Re: Configuring Spartan 3
    ... mode pins are set with M0 tied to GND and M1,M2 left pulled up ... internally to 2.5 volts. ... INIT_B signals go low and INIT_B goes high again. ... I do see something odd on the BUSY pin. ...
    (comp.arch.fpga)
  • Practical implementation question
    ... interface hardware introduces a zero input offset of 1.5 volts, ... Consequently, negative polarity signals ... I applied a sinusoidal signal to the converter and ... complement, postivive and negative representation. ...
    (comp.dsp)
Quantcast