Alternating-direct-alternating circuit is adopted and CPLD is used as logic control device of power IGBT in main circuit of variance-frequency timing system.
变频调速系统主电路采用交-直-交形式，以可编程逻辑器件(CPLD)作为调速系统逆变电路功率开关器件IGBT的逻辑控制器件。
In the application of above 24V fort current voltage grade control circuit, Voltage Alternating and resonant wave interference of input model for Programmable Logic Controllers must be resolved.
可编程控制器在高于24V的直流电压等级控制回路中应用时需解决输入模块的电压变换和谐波干扰等问题。
The product of the effective values of the voltage and current with the cosine of the phase Angle between current and voltage in an alternating-current circuit.
伏特量交流电路中电压与电流的有效值以及电流与电压之间相位角的余弦之乘积。
When using mesh, closed circuit voltage equation groups will be more exquisite, direct complex circuit is the special case of alternating complex circuit.
通过交、直流电路在使用基尔霍夫方程组解题的分析讨论，可知回路电压方程采用网孔法比较准确，不易出错。
The virtual multimeter based on ISA bus is divided into computer and ISA bus board. It is composed of A/D conversion, alternating voltage measurement, resistance measurement and interface circuit.
基于ISA总线的虚拟万用表，分计算机和ISA总线板卡两部分，由A/D转换、交变电压测量、电阻测量及接口电路组成。
It is common for the direct current circuit to be interfered by alternating current voltage.
直流回路受到交流电压干扰，是控制回路中容易产生的现象。
The detection circuit uses alternating current capacitance bridge method and the principle is based on the correlated demodulation.
检测电路为基于相关检测原理的交流电容电桥的方法。
Power supply or circuit capable of regulating either alternating or direct current within 5% of desired value, and limiting the open circuit (source) voltage to 20 millivolts maximum.
电源及能调节交流或直流电流在期望值的5%之内的，控制开路电压到最大20毫伏的路。
Through electrostatics and examples of low-frequency alternating current and direct-current circuit, the problem of zero potential point is queried and clarified.
通过静电学、低频交流、直流等电路实例，质疑了电势零点问题，并对此进行了澄清。
In this paper, a new hardware circuit of real time measuring for mine hoist force diagram based on alternating current sampling is proposed. The software algorithm is also given in the paper.
提出了利用交流数字采样法进行矿井提升机力图实时测定的一种新的硬件电路设计及其软件算法。
This paper introduces a kind of electric circuit which mainly consists of a peak detector and a pulse-width discriminator for protecting the three-phase alternating-current supply with loses a phase.
介绍了一个主要由峰值检波器和脉冲宽度鉴别器构成的三相交流电源缺相保护电路。
Transient and surge are the instant aberrance of the voltage and electric current on the simple alternating current wave circuit. surge and harmonic wave are the main manifestation.
瞬变和浪涌是正弦交流波电路上电压与电流的一种瞬时态的畸变。浪涌、谐波为主要的表现形式。
A power converter circuit (3) drives a switching device by the pulse-width modulated wave for converting a direct current into the three phase alternating current.
电力变换器主电路部（3），其根据该脉冲宽度调制波对开关元件进行驱动，将直流电压转换为三相交流电压；
A direct current control circuit adopts an alternating current contactor, so the utility model prolongs the service life and improves the reliability.
在直流控制电路中采用了交流接触器，解决了整机的寿命与可靠性。
A direct current control circuit adopts an alternating current contactor, so the utility model prolongs the service life and improves the reliability.
在直流控制电路中采用了交流接触器，解决了整机的寿命与可靠性。
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