Time ratio control with combined SCR and SR commutation

CONTROL of d-c power is used in most industry and defense systems. A new technique for controlling d-c power is called TRC (time-ratio control).^1–7 The TRC operates by rapidly turning on and off current from a d-c source of power. After filtering the resulting pulses of current, a d-c voltage is provided that is less than the source voltage.^4–7 In some applications,¹ voltage is stepped up above the source voltage.