Hi guys,
Im having some trouble coming up with a circuit to get an isolated voltage measurement into an atmega8 micro-controller.
The device is a high power motor controller that is running at 144VDC from a battery pack. The control section is isolated from the main battery, running from a 12V battery. I need to be able to be able to read the voltage of the high voltage battery while maintaining the isolation.
A few things I have considered are liner optocouplers, and a voltage to frequency converter. I would like it to be accurate as well.
Im not sure how I would go about using the linear optocoupler for the voltage measurement, but with the frequency converter, I would just convert it, then opto-isolate it then feed it into the controller.
Any Ideas?
-Adam
Im having some trouble coming up with a circuit to get an isolated voltage measurement into an atmega8 micro-controller.
The device is a high power motor controller that is running at 144VDC from a battery pack. The control section is isolated from the main battery, running from a 12V battery. I need to be able to be able to read the voltage of the high voltage battery while maintaining the isolation.
A few things I have considered are liner optocouplers, and a voltage to frequency converter. I would like it to be accurate as well.
Im not sure how I would go about using the linear optocoupler for the voltage measurement, but with the frequency converter, I would just convert it, then opto-isolate it then feed it into the controller.
Any Ideas?
-Adam