AC/DC switching converters are highly nonlinear. Therefore they draw a non-sinusoidal current with a very low power factor.
DC开关变换器非线性程度很高，输入电流为非正弦形式，功率因数极低。
The converter 1 is controlled as a fundamental sinusoidal current source, and the converter 2 is controlled as a voltage source.
变换器1被控制为一个基波正弦电流源，变换器2被控制为一个可控电压源。
For example, an arc furnace is nonlinear since it will draw a no sinusoidal current (rich in harmonic's) when a sinusoidal voltage is applied.
例如，电弧炉就是一种非线性负荷，因为加上正弦电压后，它将形成非正弦电流(大量谐波)。
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