电流环软启动通过输出电流指令递增实现，电压环软启动则比较了直流侧电压指令逐步升高法、恒定电流充电法、变PI参数调节法三种策略。

Three soft start-up technique for voltage loop are compared with each other, which are the reference of DC bus voltage gradually increasing, constant charging current and different PI modulation.

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设计了一种可程控功率源，其特点是可输出大功率的恒定电流和恒定电压，波形参数和输出变化方式可由程序控制输出；

The system is so designed and then the key ICs are choose carefully. A controllable power source is designed in this paper.

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