Circuit for converting a non-live zero, current signal to a live zero dc output.

摘要: A circuit is coupled to an external power supply and a non-live zero, two wire DC current transmitter (e.g. 4-20 MA output) for converting such live-zero output signal 0-20 powering transmitter. The has first voltage converter the signal, second receive offset from source sum of currents signal. comparator used comparing signals provide representative zero circuitry can also isolated feedback (closed loop) control power.