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isolated voltage measure for array of solar panel

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yelstor

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hello all
I construct a sine wave inverter. the source is an array of solar panels. the specification of array of solar panels is:
Vmax= 125Vdc
Vmin = 75Vdc
I need measure the voltage from solar panel. I need that this measure are isolated from control circuit.
I plane to use the ic amc1304M25, but this IC need power supply referred to power side.i do not want to design power source only for this ic.
there some other method for isolated voltage measure?
regards.
 

You might want to use an isolated power supply like MURATA Isolated DC/DC for the power supply to the which will make the design simpler.
 

very interesting isolated DC/DC, but I do not want use a Dc/Dc for feed only one IC.
I found IC SN6501. This IC with a transformer, provided a Dc source isolated from dc source
of control side.
I preferiria use other method for sensing voltage without use IC AMC1304 or another IC that need
two power supply
 

Hi

A simple method is just to generate a pwm where the duty cycle depends on input voltage.
Feed the pwm through an optocoupler and use a low pass filter on the output side.
Or feed it directely to a microcontroller capture pin.

Or use not pwm, but a V-f converter. Optocoupler. Feed it to the microcontroller timer/counter input.

The more sophisticated is a complete ADC on the one side and optocoupler for communication. It could be UART style, or SPI style.

Klaus
 
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