Precise Current Regulation with a Transductor

It has been possible to achieve five parts per million current stability for at least 10 minutes in a 10 kW power supply by using a four-core transductor as a current-sensing device. This fourcore transductor circuit eliminates excitation and magnetization ripple from the output terminals and has a transfer function which is flat up to several kilocycles. The transductor has wide range and is able to regulate current over more than a hundred-to-one range. The transductor assembly is simple, rugged, relatively inexpensive, and requires no special construction techniques.