In the precise power source, the digit synthesis technology was used in general for producing the sine-wave and the waveform phaseshift was realized by changing the initial value of the wave counter. But the circuit of this phaseshift method is very complex. 精密功率电源中,一般采用数字合成技术产生正弦信号,而波形移相可通过改变其波形计数器的初值实现,然而这种移相方法的硬件电路比较复杂。
The smaller the time mark cycle, the longer the digit of the counter and the higher the cost will be; 时标周期越小,计数器的位数越长,成本越高;