vfc

Research of VFC method used to chaos control system

VFC方法在混沌系统控制中的应用研究

A High Precision Electrical Testing System Using VFC to Make ADC

由VFC构成ADC的高精度电量测试系统

VFC Active Contour Model Based Infrared Image Contour Extraction

基于VFC主动轮廓模型的红外图像轮廓提取

Isolated Long - pulse Integrator Based on Charge - balance VFC

基于电压频率转换器的隔离式长时间积分器

A data-Acquisition System for Analog Signals of Power System Based-on VFC

基于VFC的电网模拟量数据采集系统

Characteristics Analysis of VFC Type A / D Convertor

VFC型模数变换器的特性分析

In this paper , the dynamic performance of VFC for analog signal transmission used in telemetry system was analyzed .

分析了用于遥测系统中的VFC方法传输模拟信号的动态性能。

Turn over and close board part : VFC motor , round pan reduction drive , frame and rocker .

翻板、合片部分：由变频控制电机、原盘减速机、翻板支架及摇臂组成。

The operation principle and configuration of the Voltage following controlled ( VFC ) switching capacitor DC DC converter is discussed .

论述了逐压控制的开关电容DC－DC变换器的组成和工作原理。

The Interface of Precision Frequency Measurement for PC / XT Microcomputer and Its Application in A / D Converter Using VFC

PC/XT微机高精度测频接口及其在压频式A/D转换中的应用

The paper introduces the principle , performance and feature about the changing system of VFC alternating current / date used in the high pressure computer protection installation .

本文主要介绍了当前高压微机保护装置普遍使用的VFC型模／数转换系统的原理、性能及特点。

This paper describes hardware design and ASIC implementation of an intelligent interface for a 4 channel parallel voltage to frequency conversion ( VFC ) system .

本文描述一个4通道平行压频转换系统智能接口的硬件设计及其专用集成电路的实现。

Characteristic of pulse width modulation PWM in The voltage-to-frequency converter VFC are analyzed under the basic conversion preference of charge balancing VFC .

在分析电荷平衡型VFC转换特性的基础上，根据VFC的脉冲宽度调制特性，提出基于脉宽调制式的AD转换新技术。

The method changes signal into a series of pulse , whose frequency is proportional to signal 's amplitude , through VFC circuit on the end of UUT .

这种方法在设备端通过电压频率转换将信号转换成频率与信号幅值成比例的适合远距离传输的脉冲波，在测试室通过频率电压转换电路还原该信号。

Ln addition , the data stability of VFC running in the high full scale output frequence and high sampling frequency conditions are analysed and some useful conclusions are obtained .

此外，分析了VFC型模数转换在高输出频率、高采样率情况下数据的稳定性，并得出了有益的结论。

The paper analyzes the driving system of belt conveyor , expatiates the application of voltage-to-frequency converter ( VFC ) for belt conveyor driving in the field of middle and high voltage .

本文对输送机驱动系统作了分析和比较，对带式输送机传动的变频控制（VFC）方法在中、高压领域的应用进行了讨论；

The influence on the VFC of the juice by UHT is : the alcohols reducing , the ketone producing and increasing , the ester aroma increasing in large amount .

UHT瞬时高温灭菌处理对绿茶鲜汁的香气组分影响主要表现在醇类成分减少、生成新的酮类单体及酮类香气总量增长以及酷类香气的大量增加。

To meet the demand of faulty waveform recording in protective relay , the problem of wave distortion , caused by VFC , is discussed . And an effective algorithm for wave recovery is presented .

为了满足继电保护故障录波的需要，讨论了以VFC作A/D器件引起的波形畸变问题，并根据畸变产生的原因提出用一周期积分提取衰减分量，再用傅氏变换提取各周期分量的恢复算法。

This paper discussed the principle of reducting noise using DPLL ( Digital Phase - locked loop ) composed by VFC chips and PFD ( phase - Frequency discriminator ), selecting and calculating of relative parameters ;

文中介绍了由VFC芯片鉴频，鉴相器（PFD）组成的数字锁相环路（DPLL）抑制噪声的原理和有关参数的选择和计算；

In the instrument the VFC is used to complete A / D conversion and the contacts of relays are used as a bit control output , the micro-computer system is completely isolated from measured signals and controlled objects .

仪表中采用VFC实现A/D转换，继电器接点作为位式控制输出，使仪表微机系统与被测信号、被控制对象完全隔离。

And then use minimum grey value method to determine initialization contour of VFC model automatically under the guidance of this matrix , so that the iris inner boundary could be located precisely under the internal and external force of active contour .

然后在VFC模型思想指导下，利用最小灰度平均值法自动确定VFC活动轮廓模型的初始化轮廓，在活动轮廓内外力作用下实现虹膜内边界的定位。

Using V / F-converter ( VFC ) to realize the A / D transfer is widely applied in the microcomputer-controlled measurement field . But , because of the low measurement precision and speed of common method , it limited the application area of the V / F converter .

用V/F转换器实现A/D转换在微机控制的测量领域中应用相当广泛，但使用常规的测量方法，其测量精度和速度都较低，限制了V/F转换器的使用范围。