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In this case special measures are taken to keep a count of the cumulative DC offset, and to modify the codes if necessary to make the DC offset always tend back to zero.

在这种情况下，必须作特殊的测量来计算直流输出的累积误差，并且在必要时改变电压大小来让误差永远趋向零。

Starting from the steady-state performance of three-phase fully-controlled rectified circuit, which is with large inductive load, we take the front two items of the Maclaurin series of the DC voltage average as approximate formula, with considering of the effect of the AC-side inductance first, and further effect of AC resistance on DC voltage and commutation angle.

本文从带有高感性直流负载的三相全控整流电路稳态工作的物理情况出发，首先考虑了交流侧电感的影响，进而考虑交流侧电阻对直流电压、换相角的影响，将直流电压的平均值用麦克劳林级数表示，取前两项作近似，得出了实用的解析计算公式，并给出了计算步骤，实验证明该结果具有较高的精度。

An introduction for forward topology multiple output DC/DC converter is made. A brief introduction was made to the two secondary side control technique, using magnetic amplifier and secondary side PWM regulator. And the differences between the two methods are compared.

摘 要：介绍了正激式DC/DC多路输出电源拓扑，简单介绍了两种精确调节技术：利用磁放大器进行后级调节和次级同步调节技术实现精确输出，并比较了其各自的优缺点。

Therefore it can be seen that it will "smooth" the "twice mains frequency DC" into a near constant DC voltage.

因此它可以把"两倍于电源频率的直流电"进行"平滑化处理"，成为一个接近恒定的直流电。

Simulation results show that the proposed model is correct. The proposed model offers reference for the design of DC brushless motor/generator, and can be used as technical reference for both Boost circuit and the control of digital signal processor of DC-AC conversion process.

仿真结果表明所建立的仿真模型是正确的，该模型可为直流无刷电机/发电机的设计提供参考依据，在此基础上并为Boost电路和DC-AC转换过程的数字信号处理器控制提供技术上的指导。

In the settings when the DC measurements, the moving-coil meter has a shunt in parallel and serial multiplier, along with DC diode and the transformer works in inside.

在设置进行直流测量的时候，这个动圈式仪表并联了一个分流器和串联增效器，同时还有直流二极管和变压器工作于里面。

DC-DC switching converter is a time-variant and non-linear dynamic system, and it is difficult to analyze and design.

DC-DC开关变换电路是一个时变的、非线性的动态系统，它的分析与设计一直是一个难题。

On the basis of the current situation and developing trend of modeling methods of DC-DC switching converters discussed, a circuit averaging method is put forward to model nonideal basic converters operating in the continuous conduction mode.

在对 DC-DC 开关变换器建模方法的现状及发展趋势进行深入分析的基础上，提出了一种非理想基本变换器在连续工作模式下的电路平均建模方法。

The problem of PI controller design for the multi-input and multi-output system is transformed to that of static output feedback controller design via the new state variable. As to the problem of the static output feedback, a new LMI-based sufficient condition of the controller is presented in this thesis. We can gain the multivariable PI controllers just solving one LMI inequality. The numerical example is provided to illustrate the proposed design approach. 3.The H_∞ robust control is able to solve the multivariable problem, also the control problem characteristic of the modeling error, parameters uncertainties and unknown perturbation, Its application research in the power electronics is beginning now. Considering the characteristics of the PWM DC-DC converters, a multivariable PI controllers which is based on H_∞ Performance Index is designed.

通过构造新的状态变量，可以将多输入多输出系统的PI控制器设计问题转化为静态输出反馈控制问题，利用后者的成熟理论来设计控制器；本文在问题转化后采用更为简便的算法，只需通过求解一个LMI不等式，就能求取基于H_∞性能指标的多变量PI控制器参数，实例验证了算法的有效性。3.H_∞鲁棒控制具有处理多变量问题的能力，可解决具有建模误差、参数不确定和干扰未知系统的控制问题；它在电力电子学中的应用研究刚刚开始。

Firstly, this paper analyzes and summarizes the research situation of resonant soft-switching technique and main topologies. And it indicates the main advantages and disadvantages. Then it pays more attention to analyze the parallel resonant DC link circuit theory and operating modes. It also analyzes how the resonant circuit realizes the resonant process. This paper also simplifies the control part design of the parallel resonant DC link soft-switching inverter by DSP.

本文首先对谐振软开关技术的研究现状和各种主要的拓扑结构进行了分析、综合、总结，指出了各自的优缺点；着重对并联谐振直流环电路的工作原理、电路工作模式、软开关实现机理及谐振参数的确定等进行了深入详尽的分析；利用DSP的灵活调节特点，有效地简化了并联谐振直流环软开关逆变系统的控制环节设计。

"Yes, now you can give yourself airs," she said, you have got what you wanted.

"对了，您现在高兴了，"她说道，这是您所期待的。

Then the LORD said to me: Rebel Israel is inwardly more just than traitorous Judah.

上主于是对我说：＂失节的以色列比失信的犹大，更显得正义。