Efficient Two-Way Pulse Power Applied In Printed Circuit Board

In the circuit board production process, electroplating is a common method for all kinds of electrical holes. For low density two-sided board, DC power source can meet the requirement. The high density multi-layer board requires the higher level of electroplating. Power supplies of electroplating should have good working stability, high controlling precision, short plating time and strong perforating ability. Therefore, the research of a high-level electroplating power supply becomes urgent and necessary.The paper firstly introduces the historical, present situation and development trend of electroplating power supply, and illustrates electroplating methods of different waveforms. By analyzing the pulse plating principle, pulse plating can make the coating uniform with proper plating parameter. At the same time, the paper depicts a variety of voltage conversion circuit, then it is decided to use Buck converter as the main circuit topology of the system. The paper illustrates the principle of Buck transformation in detail. Through the analysis of power system function, determined the control system strategy.The system is designed under the guidance of the above theory. By experiment, the circuit can meet the system requirements, the system outputs stable square-wave current, current amplitude can meet the requirements. Forward current, reverse current, pulse width, interval time, work time can be controlled by the program, thus, the system can make plating parameters controlled completely. By a large number of experiments, the system is stable. The maximum forward current is 50A; the maximum reverse current is 100A. The waveform is stable, fully meet customers' requirements.