Current switching circuit for an inductive load

摘要

The switches (S1-S6) are operated so as to couple one of the capacitors (20, 21) in parallel to the current mirror when the corresponding mirror dispenses current and to the supply when the mirror is not dispensing current. The current mirrors present a ratio of output to input current greater than one. Control current is injected alternately into the mirrors from the same source and is directed from one to the other by the switching devices. An additional switch (S1, S2) is connected in parallel with the input of each current mirror so as to shunt the input when it the mirror is not dispensing current. Both switches and mirror transistors may be MOSFETs.