Tube output regulation for X=ray test equipment - has comparator peak valve feedback circuit for double comparison with reference

摘要

The power regulating circuit is for the X-ray tube in X-ray test equipment. The supply uses an inverter (5), high voltage transformer (2), rectifier (3) and storage capacitor (4), to supply the tube (1), with a feedback regulator circuit operating to the peak tube voltage. The feedback regulation is back to the inverter (5) and comprises a circuit for determining the actual peak voltage on the tube for comparison with a reference (12) value. The comparison reference on the output of the comparator (8), feeding into the regulator circuit (10) which outputs to the pulse generator (11) and directly back into the inverter (5), is derived by using the pulse generator (11) to trigger a scanning and storage circuit (15) which finds the peak tube voltage. The actual peak (on 14) is fed into a comparator (13) with a reference (12), through an integrator (16) and then subtracted from the reference (18) so that the input (9) to the second comparator (8) represents the reference regulating potential. The output of the comparator (8) is the compared reference and the actual voltage fed through from the tube (7).