周桥

基于控制方程的最简解，建立了单周控制四桥臂三相四线制有源电力滤波器的电路模型。

Based the simplest solutions of control equations , one-cycle controller for the three-phase four-wire APF with four-leg is presented .

结果实验组术后2周的骨桥素表达与4周的钙染色程度均高于对照组。

Results The expression of osteonectin mRNA and the Von kossa staining showed that the latissimus dorsi muscle group was superior to the control in 2 weeks and 4 weeks after the surgery in vivo .

基于单周控制的四桥臂三相四线制串联型有源电力滤波器

The Three-phase Four-wire Series Active Power Filter with Four-leg Based on One-cycle Control

单晶六方晶相的三氧化钨纳米线的制备及电输运性质的研究基于单周控制的四桥臂三相四线制串联型有源电力滤波器

Synthesis and Electronic Transport Property of Single-Crystalline Hexagonal Tungsten Trioxide Nanowires ; The Three-phase Four-wire Series Active Power Filter with Four-leg Based on One-cycle Control

其次，理论分析和仿真研究结果表明，由于复位脉冲的非理想特性，单周控制的全桥开关功率放大器输出端存在直流偏置问题，其大小与复位脉冲的宽度成正比。

Second , the results of theory analysis and simulation research show that the output of one cycle controlled bridge switching power amplifier have DC offset because of the nonideal characteristic of reset signal .

结果：脱敏后1周，烤瓷冠桥黏固时和1个月后的疗效，实验Ⅰ、Ⅱ组与对照组均有着显著性差异（P<0.05）；

RESULTS : Significant differences were found between experimental Group A , B and the control group after 1 week ( when cementing the PFM bridges ); and also after 1 month ( P < 0.05 ) .

首先，对单周控制的半桥和全桥开关功率放大器的基本结构和工作原理进行了分析，推导了具体的控制方程，建立了单周控制的全桥开关功率放大器的小信号模型。

First , the basic structure and operational principle of one cycle controlled half-bridge and bridge circuit are analyzed , and control equation are deduced . Small signal model of one cycle controlled bridge switching power amplifier is established .

本文在研究单周控制理论的基础上，将单周控制用于四桥臂三相四线制有源电力滤波器，通过分析其开关周期平均模型，推导出它的控制方程。

Analysis for the average model of the APF in switching period is performed and the control equation is derived .