Digital PLL and digital filter are built based on conventional double closed-loop control which contains voltage loop and current loop.
前者在常规的采用电压外环、电流内环的双闭环控制基础上，搭建数字锁相环、数字滤波器。
In the design of the software part, this paper gives the software design of open-loop control with SPWM and the software design of voltage-current double closed-loop control.
在软件设计部分中，首先进行了开环系统软件设计和电压电流双闭环控制系统软件设计。
The chip of TL494 functions very strong, and its operation frequency is high. The double closed loop control of output voltage and current is realized by integrating some simple hardware circuit.
TL 494芯片功能强，工作频率高，通过外扩简单的硬件电路即可实现输出电压电流的双闭环控制。
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