Power Control to Form Capacitors

One problem area in the automatic manufacturing of tantalum capacitors is the control of direct power for forming. Basic power control consists of providing a two-parameter controller for a dynamic load. Initial load impedance is small in magnitude and resistive in character. As time progresses from the moment of power application, the load resistance increases and the load becomes more capacitive, changing in magnitude with time. This cycle is interrupted randomly by momentary impedance changes due to impurities present in the process.