Design Of Electroplating Power Supply Based On High-Frequency Soft Switching Technology

The paper firstly introduces the characteristic, historical and present situation of electroplate power supply. Then it briefly introduces the topology of power circuit of the high frequency switching electroplate power supply.The traditional DC power-supply has big bulk and weight, high ripple coefficient of output voltage, low stability and efficiency.It is hard-switch to transit which make efficiency fall to 70% around and single power is hard to keep working for a long time without redundancy system.It presents the design of a high-frequency soft switching electroplating power supply. The 7.2 kW (600A/12V) power is developed with phase-shift and current-doubter rectifier applied. In the primary side of the transformer, a blocking capacitor and a saturable inductor are used. The leading-leg is operating in zero voltage on over wide load range; In the secondary side of the transformer, current-doubter rectifier, two diodes turned off naturally, and two output inductors connected in an interleaving way, which makes the current ripple significantly reduced, and decreases the size of inductors. Therefore, the size and weight of the system can be decreased significantly. The current-sharing controller UC3907 is adopted to design the current-sharing circuit for power supply. It can realize parallel multi-module to compose high power supply system, while improving power output performance.Finally, the conclusion is the development of high-frequency switching power supply plating had met the technical specifications. The work we have done in order to improve the power performance achieves the desired requirements.