Pulse rectifier

Development projects
Author

Pulse current source for copper-plating of complex printed circuit boards

Project code: L2-6501-1538-06
Contract: 3311-04-8226501
Project type: Applied research project
Lead research organisation: University of Ljubljana, Faculty of Electrical Engineering, Tržaška 25, 1000 Ljubljana
Co-provider’s research organisation: Leonardo d.o.o. Kranj, Storžiška 4, 4000 Kranj, Elgoline d.o.o., Podskrajnik 34, 1380 Cerknica

Technical characteristics of the pulse current source:

Input values:
Supply voltage: 3 x 400 V
Frequency: 50Hz
Power: 3600 W

Output values:

Cathode current (max) IK = 2 ´ 200 A (adjustable by 1 A)
Anode current (max) IA = 2 ´ 600A (adjustably by 1 A)

Duration of cathode pulse: 1ms < TK < 100ms (adjustable by 1 ms)
Duration of anode pulse: 100ms A < 3000ms (adjustable by 1 ms)

Gradient of current pulses: 5 A/ms
Maximum output voltage: UB = 6 V

Operation mode of unit A and unit B

Synchronous operation: The time parameters of pulse current are identical in both units, while the amplitude parameters are arbitrary.

Asynchronous operation:The time and amplitude parameters are arbitrarily adjustable.

Pseudo-synchronous:
The same as the synchronous, except that there is a certain phase shift (180°) between the pulse current of the individual unit.

Enclosure:

  • photograph of pulse rectifier (cut-out, original),
  • metallographic image (through-hole diameter is 0.2 mm, board thickness is 2 mm, Aspect Ratio – AR=10),
  • course of pulse currents of sources A and B.

Photo of pulse rectifier (cutout, original),

Metallographic image (through hole diameter 0.2 mm, plate thickness 2 mm, Aspect Ratio – AR=10) – (picture left)

Course of impulse currents of sources A and B – (picture on the right)