Study on Phase Tracing for Supersonic Frequency Induction Heating Power Supply Using IGBT

IGBT超 音频感应加热电源相位 跟踪的研究

To improve traditional measuring algorithms a software frequency tracing measurement method is presented for the protection and measuring-control integrated device with fixed frequency .

针对传统测量算法的改进，提出一种基于软件的频率 跟踪测量算法，应用于固定 频率的保护和测控一体化装置。

Aimed at the characteristics of the load a phase - shifted pulse width modulated ( PS-PWM ) series resonant inverter is developed for the plastic film surface treatment and the tracing of load resonant frequency is realized with a close-loop control .

针对负载这一特点，研制一台基于移相脉冲宽度调制（PS-PWM）控制的塑料薄膜表面处理电源，实现对负载谐振 频率的闭环 跟踪。

This paper proposes a new method for measuring frequencies of power systems . Using the technology of frequency tracing and the strategy of adaptive adjusting frequency the effects due to frequency fluctuation are eliminated .

提出一种新的频率测量方法，采用频率 跟踪技术，利用自适应 频率调整策略，消除由于频率波动所产生的测量影响。

A multi-channel and simultaneous signal collection system with the function of automatically tracing the frequency

具有自动 频率 跟踪的多路同步采集系统

This platform can simulate the ray tracing for a fixed frequency or sweeping frequencies also can calculate the group path and the covered region of rays .

当平台否实现订 频或许扫频射线 轨迹演示，盘算各射线群道径，覆揭区域等功能。

Based on tracing by using external excition frequency as parameter the frequency amplitude response property of the system in obtained .

同时以外激励 频率为参数进行 跟踪延续获得系统主共振时的幅频响应特性。

A tracing system of microwave resonant frequency for measuring average densities of cryogenic liquids

测量低温流体平均密度的微波谐振 频率 跟踪系统

Clear tracing curves of how the frequency and the phase vary with time are illustrated using the recorded data from practical experiments and processed with Hilbert transformation .

进行了实际控制试验，使用希尔伯特变换对记录数据进行了分析，得到了清晰的 同步过程中 频率、相角等随时间变化的 曲线。

A new method realizing adaptive filtering system is introduced . In this system real-time tracing for center frequency of filtering and the sectional variation of bandwidth are implemented by using main frequency of signals extracted by FFT spectrum analysis .

介绍了一种较新颖的自适应滤波系统的实现方法，它是利用FFT谱分析抽取的信号主频来实现滤波中心 频率实时 跟踪及带宽分段变化。

Research on Tracing Technology of Phase and Frequency Based on FPGA

基于FPGA技术的相位 频率 跟踪方法的研究

The FFT algorithm has been further improved by tracing various signal frequencies . There fore it can calculate precisely the instant and RMS value phase angle frequency and P Q S powr factors of wave data .

在数据计算分析上，利用频率 跟踪技术对FFT算法实施改进，能准确地计算录波数据的瞬时值、有效值、相位角、 频率以及P、Q、S、功率因数等。

By fatigue tests and the tracing analysis of the gear vibration as well as the research in time domain frequency domain and amplitude domain several valuable results are derived .

通过对实际齿轮的试验与 跟踪分析，在时域、 频域以及幅值域中进行了具体地研究，得到了关于齿轮疲劳诊断的若干有意义的结果。

Experimental Study on Synchronized Tracing Control of Variable Frequency Devices Based on Phase Locked Loop

基于锁相环的 变频器同步 跟踪实验

Ray path tracing is a key step to apply geometrical theory of diffraction in solving the problems of high frequency electromagnetic scattering and radiating .

射线寻 迹是几何绕射理论（GTD）解决 高频电磁散射和辐射问题的关键步骤。

To solve the problem of exaggerated angle pulse in the ratio driving and tracing measuring technique in testing in situ for large gears the programmable dynamic frequency doubler has been developed .

为解决大齿轮在机测量过程中采用比例驱动 跟踪测量技术时转角脉冲当量过大的问题，研究开发了可编程动态 倍频器。

A wetness measurement system based on cavity perturbation method is designed for precise measuring including automatic frequency tracing system and equal precision frequency measurement system .

以汽轮机内蒸汽湿度的准确测量为目的，设计了基于微波谐振腔微扰法的蒸汽湿度测量系统：自动频率 跟踪系统和等精度 频率测量系统。

As for the periodicity of pulse tracing signals frequency domain analysis has been used to investigate pulse tracing graph and found the significantly difference between sick and normal persons .

鉴于 脉象信号的周期特性，人们将 频域分析法应用在脉图的研究上，利用脉谱图分析出了病人与正常人之间存在的显著差异。

Some date have been obtained about long-term and short-term shifting rate of clock frequency based on investigating and tracing test on S-1240 SPC exchanges . And gives reference evidences of maintenance period of clock frequency of SPC exchanges .

在调研以及 跟踪S－1240程控交换机时钟频率的测试基础上得出有关时钟频率短期和长期频率偏移的数据，提出了我国电信网中程控交换局时钟 频率的维护周期的参考依据。

We develop the seed CW laser source by using the ring dye laser pumped by a diode semiconductor laser the absolute laser frequency locking and automatic tracing system three frequency laser generator pulse dye amplifier auto-aligning system .

发射机部分：采用半导体激光器泵浦环形染料激光器作为系统种子激光光源，研制了激光频率绝对锁定 跟踪系统、 三频激光产生器、脉冲染料放大激光器、自动准直系统等。

The scheme tracing the series resonance frequency f_S is modified .

为了改善锁相系统在用于 跟踪换能器串联谐振 频率fs时的性能，提出了一种新的方案。