查询词典 supply frequency

Combined with the latest development of modern technology of power electronics and digital signal processing, the power supply reseached in the thesis is based on DSP processor and IGBT-a high speed and large power convector. Its work frequency increases to 20kHz and its control is in full digital method.

本文结合现代电力电子技术以及数字信号处理技术的最新发展，采用数字信号处理器作为控制核心，高速大功率开关器件IGBT作为逆变器功率器件，将该除尘电源的工作频率提高到20kHz，并实现了对该电源的全数字化控制。

Conventionally, the values of frequency used in the electricity supply systems.

将其他形式的能量转换成电能的过程。

The gm-C filter operates with supply voltage of 1.8V, has cutoff frequency of 1.6MHz to 2.4MHz, dissipates 0.75mW power, and has large differential input signals and wide common-mode voltage ranges of ±0.7V.

此滤波器是操作在1.8V的供应电压下，截止频率可调范围为1.6MHz至2.4MHz之间，功率消耗为0.75mW，并且具有±0.7V的高差动输入讯号及高共模输入电压范围。

According to the demand of high magnetic field power supply, reference is increased with a set ramp rate and stops at a set stable value, so reference system is composed of digital setting and digit to analog converting circuit. But the stability of reference is mostly guaranteed by the performance of D/A circuit, so D/A circuit is particularly studied in reference system. The scheme of D/A circuit, the selection of DAC and its voltage reference, hardware anti-jamming design and PCB design are discussed in detail, and software of remote control and PLC are discussed in brief. Zero-flux DC current transformer well satisfies the demands of the high stability of Load current detection unit, so the principle of zero-flux DC current transformer is analyzed; in the mean time a project which detects the long term stability is designed. During 8 hours, analog signal which is detected with high precision digit multimeter is recorded in computer at 1HZ frequency by GPIB communication. The drift error source and related parameters are explained in the compare-amplify part. Detailed subtraction circuit is designed; also amplifier chip and periphery components are selected and verified according to the theory of error analysis.

根据强磁场电源的需求，参考源应按照软件设定的斜率逐渐上升到设定稳态值，则参考源系统应由数字给定和数模转换电路两大部分组成，而参考源的稳定度主要依靠完成数模转换功能的模拟电路的性能来保证，因此本文对参考源系统的研究以数模转换电路为重点，分别从电路方案的确定、数模转换芯片及其基准电压源的选取和验证、电路板硬件抗干扰和PCB设计几方面进行了论述，然后对数字给定部分的远控组态和PLC程序设计作了简要介绍；采用零磁通原理的直流电流转换器很好地满足了对负载电流检测单元高稳定度的需求，本文详细分析了零磁通检测的原理，并在选定此种类型电流转换器的基础上设计了一套检测长期稳定度的方案，8小时内以1秒为采样周期，通过计算机Labview程序和高精度数字电压表的GPIB通讯，将被高精度数字电压表数字化后的模拟信号采样值连续记录至计算机中；比较放大环节简要阐述了漂移产生的原因和相关参数指标，确定了具体的减法电路形式，并根据误差分析理论对运算放大器和外围元器件进行了选取和验证。

Pulse power supply, with its discrete characteristic, has a wide application in the field of EDM, pulse electroplating, electric weld, high power laser pump, high frequency induction heating, purification of exhaust gas and waster water, electrostatic dust precipitation, ozone production and surface heat treatment.

而脉冲电源由于具有断续供电的特性，在电火花加工、脉冲电镀、电弧焊接、高功率激光泵、高频脉冲感应加热、工业废气处理、脉冲电解污水处理、静电除尘、臭氧制取和表面热处理等领域获得了广泛的应用。

The product supply jilt the machine of fat, jilt the belt of fat, massage eyeshade, massage stick, massage machine, re-youth mask, eye angel, low frequency medical treatment instrument and other hairdressing products.

产品供应jilt机器的脂肪， jilt带脂肪，按摩eyeshade ，按摩棒，按摩机，重新青年面具，眼天使，低频医疗文书及其他美发产品。

The key to realize the goal is the technology of ferrite used in high frequency switching mode power supply.

而制约这一目标实现的关键技术就是开关电源用铁氧体材料的高频化技术。

A power ultrasonic supply ,which can realize zero phase difference frequency tracing and fixedness of output power,is presented in this paper.

本文介绍了一种具有无相差频率自动跟踪和输出功率恒定功能的功率超声电源，此电源采用集成锁相环来实现无相差自动频率跟踪，采用 PWM方式控制 BUCK电路的斩波，达到恒功率及功率可调的目的。

In this paper, the method of quantitative analysis is adpoted, and the index of information distortion degree is proposed. The information distortion problems of agricultural supply chain are described by the analysis of frequency response curve.

本文采用定量分析的方法，提出信息失真度的指标，通过对频率响应曲线的分析来描述农产品供应链中的信息失真问题。

It is tested the time variety curve of output frequency and supply voltage in the flight process of bullet.

经过靶场试验，系统稳定可靠，操作方便，测试出了在弹丸飞行过程中涡轮发电机输出频率、供电电压随时间变化的曲线。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。