Constant current / constant-current transducer output current control circuit and output current control function with constant current / constant-current converter with it

摘要

PROBLEM TO BE SOLVED: To provide a constant-current/constant-current converter having an output current control function that improves linear characteristics of an output current with respect to a control signal and achieves the miniaturization of a transformer and a circuit scale.;SOLUTION: The converter is composed so that an output current control circuit 101 with a circuit configuration has no electrical connection on the primary side of the transformer T, has electrical connection on the secondary side whose voltage is lower than that of the primary side, and is connected to a known constant-current/constant-current converter 201. Only when a desired current value is smaller than a measured current value according to comparison results, between the measured current value obtained by detecting an output current on the secondary side of the transformer T in a current detection circuit 2 and a desired current value shown by an external control signal obtained at a transmission/reception circuit 3; an excitation-control-signal generation circuit 4 outputs an excitation control signal of a differential current value to a magnetic-flux generation circuit 6. The magnetic-flux generation circuit 6 generates magnetic flux in the canceling direction of the magnetic flux generated on the primary side in the transformer T corresponding to a magnetic flux direction detection signal from a magnetic flux direction detection circuit 5 according to the excitation control signal.;COPYRIGHT: (C)2008,JPO&INPIT