Design of constant current source to drive analog coil of space magnetic environment

Abstract

To reach the requirements that the space environment simulation coil 's magnetic induction intensity can continuously adjust from 0 to 20 Gs,and the magnetic field stability can be better than 1%,main circuit topology structure using a voltage source in series with a current source,combined with the voltage double closed loop control and the current closed loop negative feedback control methods,achieved a stable current output,reduced the power consumption of the metal-oxide-semiconductor field-effect transistor( MOSFET),and improved the efficiency of the constant current source. The test results show that the constant current source output current ranges from 0 to 10 A,Helmholtz coil's center magnetic induction intensity can reach the design requirements of 20 Gs,the current stability is better than 0. 1%,and the magnetic field stability is better than 1%.