第二个理由是很难做到将这些电路的电压控制在一个很大的频率范围内。
The second reason is that it is difficult to make these circuit voltage controllable over a large frequency range.
目前为止频率对于VCO核心电路的控制电压的应答表现出线性特征，也就是说，瓦特／赫兹。
The response to the control voltage of the VCO core circuit presented here is linear; that is to say, volts/Hz.
在连接交流电源之前，请验证交流电压、相位和频率是否与控制装置外壳门参数板上的相应数据相同。
Verify ac line voltage phase and frequency with the controller data plate on the enclosure door prior to connecting ac power.
采用模糊控制技术，实现了电弧电压或短路频率的控制，提高了焊接质量。
Fuzzy control tests of arc voltage and short-circuit frequency are conducted to improve welding quality.
参数检测和带载放电同时进行，单片机控制，可自动检测三相电压、电流、频率等参数。
Parameter test and load discharge can process at one time. It is controlled by CPU, and can automatically test three-phase voltage, current and power ETC.
所要控制的要素包括系统频率、联络线潮流、线路电流、设备的负荷和电压。
The elements to be controlled include system frequency tie line flows line currents equipment loading and voltage.
介绍了一种基于数字信号处理器(dsp)的频率电压紧急控制装置的设计方案，重点阐述了系统的硬件搭建和软件框架。
The design of the emergency control equipment for frequency and voltage based on digital signal processor (DSP) is presented with the hardware build and the software frame mainly discussed.
基于输出电压表达式，还提出谐振开关电容变换器的频率控制方案。
A frequency control method for RSC converters was achieved based on the output voltage expression.
孤立运行异步发电站的频率和电压控制方法必然可以在孤立运行的同步发电站中应用，为分散能源的开发提供技术支持。
The method of single asynchronous generator's frequency and voltage control is fit to synchronous station absolutely, offering technical support to the development of the distributed generation.
当电网电压和频率的变化时，分析了电动机、变压器、控制及保护系统、照明系统、通信导航设备等受电器工作的可靠性。
When the variation of bus-bar voltage and frequency occurs, the reliability of electric motors, transformers, control and protection system is analyzed in this thesis.
稳态控制潮流的设定空载频率及空载电压算法。
Setting open-circuit frequency and voltage algorithm for steady-state control power flow .
下超调下超调指电压调整器或控制器在应对负荷变化时，电压或频率低于额定的量。
Undershoot Undershoot refers to the amount by which voltage or frequency drops below the nominal value as the voltage regulator or governor responds to changes in load.
既要保持电压而在限制范围内的频率，需要良好的功率控制和负载调节。
To maintain both the voltage and the frequency within limits requires fine power control and load regulation.
在线调节步长改变电压收敛速度，设计锁相控制电路，自动同步跟踪电网频率和相位。
The online variable step can also regulate the voltage convergence rate, and the phase-locked control circuit is designed to synchronously trace frequency and phase of power grid automatically.
讨论了一些影响放电电压大小及频率的电源参数，如供电电压、控制信号占空比、振荡电路的电阻和电容等。
Some factors affecting the frequency and magnitude of power supply, such as supply voltage, duty of control signal, the resistance and capacitance of oscillation circuit are discussed.
研制了一种检测氧化锌避雷器阀片的重复频率充放电装置，采用L C恒流充电技术，通过电压反馈法控制充放电运行过程。
The charging technique with L-C constant-current converter is adopted, and the repeated charging and discharging process of the device is controlled by voltage feedback.
TL 494芯片功能强，工作频率高，通过外扩简单的硬件电路即可实现输出电压电流的双闭环控制。
The chip of TL494 functions very strong, and its operation frequency is high. The double closed loop control of output voltage and current is realized by integrating some simple hardware circuit.
对影响放电电压大小及频率的电源参数进行了讨论，如供电电压、控制信号占空比、振荡电路的R和C等。
Some parameters affecting the frequency and magnitude of power supply, such as supply voltage, duty of control sigal. the R and C of oscillation circuit are discussed.
建立了超磁致伸缩执行器基于输入电压-输出位移的控制模型，实验测得系统频率响应曲线与仿真结果一致。
The control model based on input voltage and output displacement was built up, the frequency response curve of experimental measurements were exactly coincident withs…
改进后逆变器输出滤波器的截止频率可以取较高值，保证足够的控制系统带宽，有效提高逆变器输出电压波形质量。
The cut-off frequency of improved inverter output filter can be set higher to ensure the bandwidth of control system and improve the waveform quality of inverter output voltage.
根据微机控制电压的大小改变调功器电路输出电压的频率；
The output voltage frequency of power regulator will change with the controlling voltage.
它使用压电晶体将人体体动转换为电压，用此信号控制起搏频率的变化。
The model uses piezocrystal as a sensor to transfer the body mo-ving into electric signal and to control the rate.
三台航空静止变流器模块均为电压、电流双环控制，通过公用电压调节器稳定并联系统的输出电压及频率，同时产生统一的模块电流给定信号。
Each module is controlled by voltage current two closed loops. The common voltage loop controls system output voltage & frequency, and generates a common reference current signal.
单片机协调控制变极性脉冲MIG焊的脉冲电流及电弧极性、电弧电压及熔滴过渡频率，实现了稳定的焊接过程。
Pulse current, arc polarity, arc voltage and metal transfer of variable polarity pulse MIG welding are controlled by 80c196kc coordinately to implement the stable welding procedure.
系统以DSP为控制核心，可自动识别并适应不同的电压和电流等级，采用程控放大、变化采样频率以获得优化的阵列测试效果。
The tester with DSP core could get excellent results by judging and adopting the different value of voltage and current, programmed amplifying and changing the frequency of sample.
传统电压控制模式的电机驱动电路系统频率都受电机的本征频率制约，其相位延迟会随负载的变化而变化。
The system bandwidth of conventional voltage-control-mode motor driver circuits is limited by the intrinsic frequency of the load, and its phase lag is also load-dependent.
由于永磁直驱风力发电系统所发出的电能为电压和频率的交流电，为得到恒压恒频的电能，本文进行了逆变控制系统的软硬件设计。
To get constant voltage and constant frequency energy that users need, the software and hardware of the inverter control system is designed.
由于永磁直驱风力发电系统所发出的电能为电压和频率的交流电，为得到恒压恒频的电能，本文进行了逆变控制系统的软硬件设计。
To get constant voltage and constant frequency energy that users need, the software and hardware of the inverter control system is designed.
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