特殊突发还可以承载物理层控制符号如用于内环功率控制的TPC符号。
The Special Burst may also carry layer 1 control symbols such as TPC bits for the purposes of inner-loop power control.
提出了采用滑模变结构电流内环与由PI调节器和数字低通滤波器组成的电压外环相结合的控制系统，以实现高性能高速度的功率因数校正。
This PFC was realized by employing sliding-mode variable-structure inner current loop control and outer voltage loop PI control with digital low-pass filter to achieve high performance.
可采用SPWM控制功率管的关闭与导通，采用外环电压环，内环电流环的双环控制。
We can use SPWM to control power tube on or off, can use the double-loop control with the inductance current inner loop and capacitor voltage outer loop is introduced.
通过直流电压外环的功率平衡控制及比例积分校正，配合内环并网电流反馈控制，使并网逆变器在保持并网电流质量的同时更好地控制直流电压。
A DC voltage outer loop control for power balance and PI correction and an ac current inner loop control for feedback are designed to ensure the current quality and stabilize the DC voltage.
同时，内环采用电流前馈解耦方式，分别独立控制有功功率、无功功率。
The inner loop adopts the current feed-forward decoupled mode to control the active power and reactive power independently.
结论：对于COPD急性发作期患者，在实施NIPPV治疗的同时，积极控制感染、纠正低蛋白血症及内环境紊乱，尤其是加强循环系统监护治疗，将有助于提高NIPPV治疗的成功率。
Conclusions: for the COPD patients during acute stage, amelioration of low blood albumin and anxiety, and circulation support would be useful for the successful implementation of NIPPV treatment.
结论：对于COPD急性发作期患者，在实施NIPPV治疗的同时，积极控制感染、纠正低蛋白血症及内环境紊乱，尤其是加强循环系统监护治疗，将有助于提高NIPPV治疗的成功率。
Conclusions: for the COPD patients during acute stage, amelioration of low blood albumin and anxiety, and circulation support would be useful for the successful implementation of NIPPV treatment.
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