实验与仿真结果表明：该系统采用音频开关而不导致电机负载的音频噪声，同时使EMI能被限制在低电平。
Experiments and simulations show that the proposed system can operate in audio switch frequency range without audio noise from the motor load, meanwhile, EMI can be limited to low level.
“最大信号电平”是指能够切换但又不会损坏开关卡的电压、电流和功率的最大值。
"Maximum signal levels" refers to the highest levels of voltage, current, and power that can be switched without damaging the switch card.
作为技术指标，如果在最大信号电平下采用冷切换而非热切换，那么触点寿命将会从105次开关次数延长至108次开关次数。
As the specifications state, if cold switching is used instead of hot switching at maximum signal levels, contact life is extended from 105 closures to 108 closures.
本文提出了一种新型的零电压零电流开关pwm推挽三电平直流变换器，其中开关管的电压应力为输入电压。
This paper presents a novel zero voltage and zero current switching (ZCS) PWM push pull three level converter in which the voltage stress of switches is input voltage.
提出了一种新型的零电压开关全桥三电平直流变换器。
This paper presents a novel zero voltage switching full bridge three level converter.
最后，本文还提出了另外几种零电压零电流开关PWM推挽三电平直流变换器。
Several zero voltage and zero current switching PWM push pull three level converters are proposed.
如果输出电压小于预定的电压电平，则开关电路部分将增强的控制信号传输到调节电路。
If the output voltage is less than the predetermined voltage level, the switching circuit portion transmits an enhanced control signal to the regulation circuit.
多电平逆变电路具有输出谐波少、开关频率低等明显上风，非常适合应用于高压大功率的变频调速领域，具有现实的节能意义。
It has significant advantages, such as less distorted output, lower switching frequency, etc, and it has reality energy conservation significance in application of the high - voltage and high-power.
第一开关电路耦 接至电平转换器，并在第三晶体管导通时，关闭第四晶体管。
The first switch circuit is coupled to the electrical level translator and turns off the fourth transistor when the third transistor is turned on.
采用级联型多电平逆变器给异步电机供电，逆变器的开关信号利用载波移相脉宽调制方法生成。
The asynchronous machine is fed by cascaded multilevel inverter, and the inverter switching signals are generated by carrier phaseshifted pulse width modulation method.
而第二开关电路耦接至电平转换器，并在第一晶体管导通时，关闭第二晶体管。
While the second switch circuit is coupled to the electrical level translator and turns off the second transistor when the first transistor is turned on.
主要论述了基于四电平功率变换电路的开关磁阻电机直接瞬时转矩控制。
In this paper, a direct instantaneous torque control (DITC) of switched reluctance motor (SRM) with a four-level converter is presented.
对于便携式电子产品来说，运算放大器可算是万能的信号调节电路，因为它可以执行滤波器、放大器、电压感测器、电平移位器、缓冲器、甚至开关等多种不同功能。
Operational amplifier is the most versatile signal conditioning block in any portable system. It can be a filter, an amplifier, an voltage detector, a level shifter, a buffer or even a switch.
在高压大容量应用场合，多电平逆变电路具有显着的优势，比如输出谐波少、开关频率低等。
In high voltage and high power fields, multilevel inverter has significant advantages, such as less distorted output, lower switching frequency, etc.
通过三电平拓扑和传统两电平拓扑电路的对比分析，得出了相同先决条件下这两种拓扑中开关管电压应力和电感电流可减小的幅度。
By analyzing the current ripple of the inductor and voltage stress of switches at the same conditions, the reduced value of the current ripple and voltage stress with three-level topology can be got.
为解决开关器件在多电平高压功率变换器的驱动和保护问题，提出了一种光纤隔离的驱动保护电路。
The circuit isolated by optical fibre for transmitting drive signals and avoiding over current is proposed to solve drive and protection problems for transistors in high-voltage multi-level convertor.
从三电平矩阵式电力变换器的拓扑结构入手，分析在高频下工作时开关损耗带来的负面效应。
Adverse effects of switching losses which operating at high frequency are analyzed at the beginning of a three-level matrix power converter configuration.
分析了一种新颖的零电压零电流(ZVZCS)开关之电平变换器，以及功率晶体管的驱动电路。
A novel zero-voltage and zero-current switching (ZVZCS) three-level converter, and the drive circuit of the transistor were analyzed.
在研制这种多电平逆变器时，一个关键的问题就是如何来产生开关角度，并以此来生成基波电压且不产生特定的低次谐波。
A key issue in the design of such an inverter is to determine the switching angles so as to produce the fundamental voltage and not to generate specific lower order harmonics.
将二极管箝位式三电平逆变器应用于三相并联有源滤波器以降低开关管应力。
The diode neutral point clamped three-level inverter for three-phase shunt active power filter is applied to reduce the switch stress.
只要控制接收器中超辐射的光电转换电平，就能控制打开Q开关时的反转粒子数，也就能稳定输出的巨脉冲激光。
So we can control the population which can trigger the Q-switch by controlling the superradiant convert electrical level in the superradiant detector and then the laser output can be stabilized.
从高频合成理论的角度出发，提出了基于理想开关的多电平结构的基本拓扑单元。
Based on the analysis of converters with Waveform High Frequency Synthesis, the basic cells of multilevel topology with ideal switches and IGCTs are both proposed.
将三电平技术应用到双向DC/DC装置中，可以提高混合动力汽车驱动系统中双向DC/DC装置的开关频率，为此提出了一种新的三电平双向DC/DC变换器拓扑。
To improve the switch frequency of the bidirectional DC/DC converters in Hybrid Electrical Vehicle(HEV), a novel three-level topology of the bidirectional DC/DC converter is presented in this paper.
为改善级联型多电平逆变器输出电压波形质量，对通过控制逆变单元开关角实现级联多电平逆变器谐波控制的方法进行了分析研究。
In this paper, the means of harmonics control by selecting switching angles are analyzed for improving quality of output voltage in cascaded multilevel inverter.
传统两电平脉宽调制电磁轴承开关功放的电流纹波较大，导致电磁轴承中产生的纹波损耗较大。
Different from conventional two-level PWM switching power amplifier, the switching power amplifier can achieve current ripple reduction.
传统两电平脉宽调制电磁轴承开关功放的电流纹波较大，导致电磁轴承中产生的纹波损耗较大。
Different from conventional two-level PWM switching power amplifier, the switching power amplifier can achieve current ripple reduction.
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