为及时向切换控制提供线路电流同步信号，提出了一种预测电流过零的方法。
To provide synchronization signal of line current for switching control in time, a method to forecast the crossover point of the current was given.
LED球泡灯内置微型电脑芯片，可任意编程，能永远同步变色工作，无需外接控制器和控制线路。
LED bulb is designed with an inner MCU chip, which can be programmed, to synchronous work on color changing without connecting to controller.
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