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Ballast water is the water and suspended matter used to control the ship heels, trim, draft, stability or stress. Because of the large number of ballast water carrying a large number of biological ,it carries big dangers to the local ecological system ,and becomes one of the marine environment hazards. For the serious harm from ship ballast water, the paper introduces a high-voltage pulse power supply used to process the ballast water. By selecting the appropriate parameters of the Power, We get a good teffect of ballast water treatment.In this paper, considering of the huge amount of ballast water, we select the constant voltage charging circuit which is a simple, easy operation and low cost way for high-voltage pulse power supply. Charging circuit including: (1) high-voltage transformer, parameters: 220/5000V, 5kVA; (2) high-voltage silicon rectifier stack, parameters: 2DL50/1; (3) energy-storage capacitor, 40~80μF, 10kV; (4) protective resistance, parameters: RX20 500W, 10kΩJ. Discharge circuit including: (1) discharge switch:spark gap, the gap distance automatically adjustable; (2) water-treating container; (3) safety grounding device.We got some useful conclusions through the performance test for the high-voltage pulse power supply made by us. (1) When the discharge circuit inductance changes, the other conditions remain unchanged. Discharge characteristics will be affected, such as when the inductance value increases, the discharge current peak and discharge oscillation frequency decreases. (2) When the capacitance changes, the discharge characteristics will be affected. When the capacitance increases while the charging voltage is constant, the discharge oscillation cycle and the discharge current peak will increase, discharge time delay decreases. (3) When changing the capacitor’s charging voltage, the discharge characteristics will change accordingly. The higher the voltage, the larger the discharge current peak and discharge oscillation frequency.We use the high-voltage pulse power supply to treat the ballast water and get good results that bactericidal rate of up to 99%. And some conclusions are as follows: (1) the greater the capacity, the better the treatment effect. (2) the higher the discharge voltage, the higher the efficiency. (3) the discharge frequency is higher, the better the treatment effect.
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