Research on Switching Characteristics Based on Optimization Design of SiC MOSFET Drive Circuit

With the increasing emphasis on energy conservation,emission reduction and environmental protection,the application prospect of SiC power devices is becoming more and more broad.In the high frequency application of SiC MOSFET,the change rate of voltage and current in the turn-on and turn-off process increases with the increase of switching frequency.Also,the current and voltage spike oscillation phenomenon is gradually intensified due to the influence of circuit stray parameters.Based on the analysis of SiC MOSFET characteristics,the paper discusses the design requirements and design principles of SiC MOSFET drive circuit.Then,taking the SiC module C2M0080120D of Cree Company as an example,a driver circuit design is realized through the ACPL-355JC optocoupler driver module of Broadcom Company.The circuit not only has the characteristics of fast transmission delay and excellent performance,but also has the functions of overload and short circuit protection.The driving circuit is verified by LTspice simulation software,and the switching characteristics of SiC MOSFET under different working conditions are studied in depth.The experimental results show that the driving circuit can improve the switching time of SiC MOSFET and effectively solve the problem of current and voltage spike oscillation,which lays a foundation for the practical application of SiC MOSFET in the future.

Benefit evaluation on ESCO driving force for market development of energy-saving building

ESCO is the internal driving force for the development of the existing building energy-saving renovation market,and the driving effect of the ESCO market depends on scientific and effective comprehensive benefit evaluation.Based on analysis of the status qua at home and abroad,this paper reveals the necessity and value of research existing Building Energy Saving ESCO market development driving force effectiveness evaluation.The purpose of ESCO driving force benefit evaluation-oriented,establish the basic principles of evaluation index system of choice.Through the analysis of the evaluation content of the three dimensions of economic benefit,environmental benefit and social benefit,the comprehensive evaluation index system of the target level,criterion level and index level of the benefit evaluation of the existing building energy-saving renovation market development is constructed.AHP and fuzzy comprehensive evaluation of the combination,construct quantitative models of energy-saving drive ESCO market development role in the evaluation of the effectiveness of existing buildings.Based on the quantitative evaluation process of ESCO’s role in the development of our country’s existing building energysaving renovation market,it is necessary to scientifically understand the current status of ESCO’s driving role,and reveal the path to improve the efficiency of ESCO-driven development of the existing building’s energy-saving renovation market,in order to enhance the internal driving force of ESCO to promote.The existing building energy-saving renovation market is developing in a healthy and orderly manner.

Optimization and implementation strategy of ESCO driving force in the development of energy-saving transformation market of existing buildings

The development of the existing building energy-saving transformation market is inseparable from the internal driving force of ESCO.Giving full play to the driving role of ESCO scientifically is the internal requirement to promote the healthy and orderly operation of the existing building energy-saving transformation market.This paper summarizes the practical experience of developing ESCO driving force operation in foreign existing building energy-saving transformation market,analyzes the bottleneck of developing ESCO driving force operation in China’s existing building energy-saving transformation market,and puts forward useful practical enlightenment based on the comparison between home and abroad;According to the optimization principle of ESCO driving force operation in the development of existing building energy-saving transformation market,the optimization design framework of ESCO driving force is proposed,and the implementation strategy of ESCO driving force optimization in the development of existing building energy-saving transformation market is planned.In order to optimize and improve the effectiveness of the operation and development of the energy-saving transformation market of existing buildings with the internal driving force of ESCO.

Application of digital driving circuit in arc welding power source based on HCPL-316J

The digitalization of arc welding power source mainly depends on the digitalization of arc welding inverter,so that main circuit and controlling system can give full play to advantages.Digital switching control makes main circuit digital and DSP and/or MCU makes controlling system,digital.So IGBT driving circuit,as a tie of main circuit and controlling system,should also be got digitalized.Thus,a digital driving circuit based on optocoupler device HCPL-316 J is provided.Some testing experiments were done.After driving testing,the driving circuit certificates that driving waveforms satisfy the requirements of arc welding power source and the driving circuit is reasonably and simply designed.And the driving circuit has high controlling precision and reliability.No-load-voltage testing and welding external characteristic testing prove that the driving circuit can be applied in arc welding power source.

A Practical Pll-Based Drive Circuit with Ultra-Low-Noise Tia for Mems Gyroscope

A novel phase-locked loop( PLL)-based closed-loop driving circuit with ultra-low-noise trans-impedance amplifier( TIA) is proposed. The TIA is optimized to achieve ultra-low input-referred current noise. To track drive-mode resonant frequency and reduce frequency jitter of actuation voltage,a PLL-based driving technique is adopted. Implemented on printed circuit board( PCB),the proposed driving loop has successfully excited MEMS element into resonance,with a settling time of 3 s. The stable frequency and amplitude of TIA output voltage are 10.14 KHz and 800 mVPP,respectively. With sense-channel electronics,the gyroscope exhibits a scale factor of 0.04 mV/°/s and a bias instability of 57.6°/h,which demonstrates the feasibility of the proposed driving circuit.

Speeding up generation of photon Fock state in a superconducting circuit via counterdiabatic driving

Optimal creation of photon Fock states is of importance for quantum information processing and state engineering.Here an efficient strategy is presented for speeding up generation of photon Fock state in a superconducting circuit via counterdiabatic driving.A transmon qubit is dispersively coupled to a quantized electrical field.We address a ∧-configuration interaction between the composite system and classical drivings.Based on two Gaussian-shaped drivings,a single-photon Fock state can be generated adiabatically.Instead of adding an auxiliary counterdiabatic driving,our concern is to modify these two Rabi drivings in the framework of shortcut to adiabaticity.Thus an accelerated operation with high efficiency can be realized in a much shorter time.Compared with the adiabatic counterpart,the shortcut-based operation is significantly insusceptible to decoherence effects.The scheme could offer a promising way to deterministically prepare photon Fock states with superconducting quantum circuits.

Research on IGBT Drive Circuit Based on 2QD30A17K-I Driver

The insulated gate bipolar transistor(IGBT) has become the most popular controllable power switching device in the design of power electronics industry.As the interface of power circuit and control circuit in power source, the IGBT drive circuit should be with short transition time and the function of isolating safely and monitoring correctly the short-circuit and over-voltage fault.This paper presents the short-circuit protection theory and relative parameter selecting rules,based on the research on 2QD30A17K-I,the representative of high voltage and high power driver.

Practical Drive and Protection Circuits for the IGBT

The essential requirements of IGBT drive circuit is expounded.The short-circuit characteristic and over-current protection of the IGBT are described in detail.Finally,the practical drive and protection circuits are designed.The practical results show that the circuit is good in performance.

基于DCS-惯性权重组合的柔性机械臂运动轨迹控制系统研究

为了有效调控机械臂运动幅度,避免柔性机械臂实际运动轨迹与目标轨迹发生较大的偏差,设计一种基于分散控制系统(DCS)-惯性权重组合的柔性机械臂运动轨迹控制系统,它是一个集合了计算机、通信、显示和控制的计算机系统,该系统由过程控制和过程监控。通过DCS算法控制监测对象行为幅度并计算柔性机械臂惯性权重,利用DCS-惯性权重组合求解素数控制指标的具体数值,实现了对柔性机械臂运动轨迹控制系统的软件设计。实验结果表明,DCS-惯性权重组合算法作用下的机械臂末端坐标在横轴、纵轴、空间轴方向上的运动幅值均可以被控制在10个单位长度之内,并且在0.52 s内进入机械臂运动轨迹最佳控制状态,运动轨迹差值最大仅为0.01 rad,验证了该系统具备可行性和有效性。

一种抑制栅极正负向串扰的GaN HEMT无源驱动电路

GaN器件由于其更快的开关速度,比硅器件更容易发生严重的开关振荡,也更容易受到栅源电压振荡的影响。为了抑制GaN基半桥结构中的串扰,提出了一种抑制GaN高电子迁移率晶体管(HEMT)栅极正负向串扰的无源钳位驱动电路来抑制栅源电压振荡。采用基本无源元件建立自举驱动回路,并增加三极管以构成从驱动电路到GaN HEMT的低阻抗米勒电流路径,抑制正负向串扰。在LTspice软件下进行电路模拟仿真,并搭建实验平台进行实测验证,结果表明栅源电压的最大正向串扰可降至1.2 V,最大负向串扰可降至1.6 V,漏源电流的正向和负向串扰均降至2 A以下,证明该电路对栅源电压以及漏源电流的振荡均有良好的抑制效果。

不对称短路故障下永磁直驱风电机组并网控制策略研究

电网侧发生不对称故障时,永磁直驱风电机组并网电流会发生三相不平衡的问题。针对这一问题,提出一种基于自适应陷波器的网侧换流器控制策略。该控制策略基于解决机组并网电流二倍频分量的思想,在电网侧发生不对称短路故障时,将进入逆变器的dq坐标系下的二倍频电压分量去除,从而使得网侧换流器输出的电流达到三相平衡。本文首先分析了电网侧发生不对称短路故障后永磁直驱风力发电机组的动态响应;然后建立了机侧和网侧换流器的模型,并分别采用了双闭环矢量控制技术和基于自适应陷波器的控制策略;最后进行仿真分析,验证了改进后的控制策略相较于传统控制策略,有效解决了不对称短路故障下并网电流三相不平衡问题。

IGCT门极驱动装置杂散电感测量与改进

集成门极换流晶闸管(IGCT)的关断能力高度依赖其门极驱动单元的换流能力,为了提高其换流能力,限制杂散电感是关键。分析了影响关断电路中杂散电感的主要因素,提出了抑制和减小电路杂散电感的方法,采用此方法将关断回路总杂散电感从13.6 nH降低到4.7 nH,最终达到3.5 nH,使门极电流峰值和上升率分别达到-6 120 A和-5 720 A/μs,满足4 500 V/4 000 A IGCT的驱动电路关断能力的要求。对环绕型关断电路的杂散电感进行详细划分和测量,针对采集的各部分电感分布量进行分析,结果对更高电流容量IGCT驱动电路板的设计有重要的参考价值。

高压断路器操动机构驱动电机及其控制技术研究

高压断路器操动机构用电机驱动提高了断路器运行的可靠性与可控性,因此设计了一套适用于126 kV真空断路器的电机操动机构。基于操动机构动力学分析结果确定驱动电机转矩、转速要求,提出一种有限转角永磁无刷电机设计方案,研制样机进行联机试验完成动作要求检验。在此基础上,设计分段转矩控制策略,结合驱动电机输出转矩需求将操动机构的运动过程分为4个阶段,从降低触头碰撞、避免预击穿现象发生、提高断路器工作可靠性角度对各阶段电机输出转矩进行动态调节。结果表明:所研制的驱动电机配合分段转矩控制策略,在保证灭弧室对操动机构动作时间、动作速度要求的前提下,实现了操动机构的运动过程优化和工作可靠性提高,促进了断路器智能化操作进程。

煤矿氧气检测高精度VCSEL驱动及温控电路设计

为解决当前常用煤矿氧气检测仪器易受交叉气体干扰且功耗大的问题,基于GD32F303RCT6微控制器和ADN8834热电冷却控制器,设计了一种软启动开关电路控制的垂直腔面发射激光器(Vertical-cavity Surface-emitting Laser,VCSEL)高精度驱动及温控电路。驱动电路中,高频正弦波信号和低频锯齿波信号叠加的二进制数据由微控制器产生,经信号发生电路、电压电流转换电路转化成VCSEL高精度驱动电流信号;温控电路中,设计基于比例积分微分(Proportional Integral Differential,PID)补偿电路和数模转换控制器(Digital to Analog Converter,DAC)目标温度控制电路实现激光器温度自动调节。测试结果表明:驱动电路的电流输出区间为0.680~1.360 mA;锯齿波频率误差小于0.5%,正弦波频率误差小于0.1%;氧气吸收峰扫描精度高达0.07 pm,对应电流扫描精度为0.12μA;温控电路的温度控制精度为±0.012℃。满足了可调谐半导体激光吸收光谱(Tunable Diode Laser Absorption Spectroscopy,TDLAS)煤矿氧气检测应用需求。

半导体激光器驱动器的SPICE仿真及其在气体传感系统的应用

为了提高激光器的工作可靠性和稳定性,借助TINA-SPICE软件对其驱动电路进行辅助设计,并通过电调制和光电检测系统实验检验设计效果。对驱动器的恒流输出电路的幅频特性和瞬态响应进行仿真,预测潜在的电流振荡现象,并提出一种用于补偿环路增益的易用方案。通过对比补偿前后的仿真曲线,验证了该方案的可行性。在此基础上,以STM32H743作为中央处理核心,通过触摸屏图形化设置和监测驱动电流参数,从而调度激光器驱动电路的运行。在296 K环境温度下,利用该电路进行半导体激光器电调制特性实验,通过拟合波长与电流得到调制系数为0.045 cm-1/mA。进一步地,将该控制器引入基于红外光谱吸收技术的气体传感系统,完成了对甲烷气体的定量分析。分析结果表明,所设计的电路能稳定地驱动激光器并实现对波长的精准调制,获得的气体传感系统的检测下限低于8 ppm。

基于端部漏磁场分析的集成式电机驱动系统在线匝间短路故障诊断

基于宽禁带器件的变频器具有高功率密度和耐高温工作的优势,通过小型化和轻薄化设计可以将变频器置于电机端盖与端绕组之间,构成结构紧凑的集成式电机驱动系统。该系统发生匝间短路故障时,短路绕组电流增大不仅会使电机内部温度升高导致电机绝缘性能降低,还将引起磁场变化影响变频器的正常工作。以一台1.5 kW的交流感应电机为例,搭建基于宽禁带器件的集成式电机驱动系统三维物理模型,利用数学解析法分析并计算匝间短路故障前后的端部漏磁场,并提取电机内端部印制电路板(printed circuit board,PCB)表面与轴心距离相等、机械角度相差45°的两点处磁感应强度在直角坐标系下椭圆曲线的离心率反映端部漏磁场的对称性,以此为特征指标判断电机是否出现匝间短路故障。仿真与实验结果验证了所提方法的正确性和有效性。

两开关无电解电容LED驱动电路拓扑及控制策略

LED驱动电源常因含有平衡输入输出功率的电解电容而导致寿命大打折扣,为延长LED驱动电源的使用寿命以及提高其可靠性,该文提出一种两开关无电解电容LED驱动电路拓扑,该拓扑以反激变换器为基础,通过集成的辅助储能电容实现输入输出瞬时功率平衡,从而大大地减小了抑制输出电流低频纹波所需的电容器容值,实现无电解电容化,并充分吸收漏感能量,使电源效率得到提高。详细分析该电路拓扑的工作原理及各个模态,给出参数设计方法,并提出相应控制策略,最后,搭建一台35 W原理样机验证了该电路拓扑的可行性。

基于三电平的超声波电机驱动电路调速性能研究

从超声波电机驱动电路拓扑结构出发,使用三相全桥电路构建三电平波形发生电路,得到基于三电平的超声波电机驱动电路,通过改变相关PWM驱动参数可以实现电机驱动波形的调频、调压和调相功能,进而实现电机调速。通过分析得到驱动电压、驱动频率与行波幅值之间的关系,使用半实物仿真平台对基于三电平的超声波电机驱动电路进行测试,验证空载、带载时超声波电机在调压、调频、调相的情况下转速的变化情况,从而实现基于三电平的超声波电机的调速性能测试,为电机调速打下基础。

一种灵活可靠的IGBT驱动电路设计

在当今减碳排放背景下,全控型功率器件IGBT以优异的性能广泛用于各种变流器中,有效可靠的驱动电路对IGBT的安全工作至关重要,特别是大功率应用场合。针对大功率IGBT应用中对驱动电路灵活可靠的要求,设计了一种基于智能集成光耦驱动器ACPL-332J的IGBT驱动保护电路,分析了ACPL-332J的各项参数,并以ACPL-332J为核心设计了驱动电路。以英飞凌FF600R12ME4为应用IGBT,通过双脉冲试验、短路试验验证了设计电路驱动及保护的有效性。

基于线阵CCD的实验教学平台设计

在光电类课程的实验教学中,电荷耦合器件(CCD)是一个重要内容,传统的相关实验教学一般以演示性实验为主,导致学生对该器件的了解不够深入。该文提出一种适合各种线阵CCD的综合实验平台,采用该平台学生可以自主进行CCD驱动电路的设计实验、积分时间调节实验、角度测量实验和长度测量实验等。通过使用该平台,有助于提高学生的线阵CCD使用能力、单片机调试能力、基于LabVIEW的软件编程能力、电路板焊接能力和光路搭建能力。