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Turnbull Fred G. Tompkins Russell E. 《Industry Applications, IEEE Transactions on》1987,(6):1016-1021
The design and fabrication of a parallel resonant converter circuit and a high-frequency step-up transformer used to supply an adjustable dc voltage to a load is described. The 500-W system is operated from 115/230 V single-phase 60-Hz power, which is rectified and filtered to form a 310-V dc link. A two-transistor half-bridge circuit operating at a fixed frequency above the circuits resonant frequency converts the dc voltage to an ac voltage at approximately 20 kHz. This high-frequency voltage is transformed with a low-capacitance oil-impregnated ferrite transformer. The output voltage is rectified to form a dc voltage with a maximum value of 90-kV peak. The output voltage is adjustable using pulsewidth modulation of the conduction time of the two transistors in the power circuit. The energy stored in the resonant circuit provides a sinusoidal transformer voltage at fixed frequency over a wide range of control. The system is provided with a closed-loop peak-voltage regulator and an on-off capability from the control electronics. The transformer is designed for a specific value of inductance and capacitance to operate at the desired resonant frequency and characteristic impedance. 相似文献
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本文介绍采用PWM信号控制以IGBT为主开关元件的高频开关稳压电源。PWM信号由TL494IC片产生,用EXB840专用驱动器驱动IGBT。该电源具有输出电压稳定.电路简单,体积小,可靠性高,效率高和通用性强等特点。 相似文献
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采用锁相环技术,通过拾取某一相的信号,经过相位比较、低通滤波、压控振荡实现触发信号脉冲与拾取的相位信号同步.给定信号和反馈信号经过PID调节,送C8051F310单片机的ADC单元,经程序处理产生同步移相脉冲输出,送由复杂可编程逻辑器件EPM7032完成脉冲成型及放大,由触发器电路输出控制三相可控硅全控桥实现交流调压,... 相似文献
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介绍了单相有源PFC控制芯片UCC28019的工作原理,利用UCC28019搭建了带PFC的Boost变换功率电路和单片机控制电路。设计的直流电源功率因数高,输出电压范围大,可由键盘设定步进值,误差绝对值小。系统具有限流保护功能,实时显示输出电压电流,可长时间运行,稳定可靠。 相似文献
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提出了一种升压型准谐振PFC电路,详细分析了电路的工作原理及特性,并在一台功率为100W、开关工作频率为100kHz的通信用开关电源装置上进行了实验验证。实验结果证明了该电路实现了零电压开关,功率开关管电压电流应力小。同时高频工作状态使得电源装置实现了高效化、小型化和轻量化。所提出的PFC电路在满载时效率高达91%。 相似文献
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为解决传统感应加热电源桥式逆变器控制策略复杂,开关损耗大以及输出谐波分量大的问题,提出了一种新颖的双开关逆变器。该逆变器仅含两个开关器件,采用推挽式(push-pull)互补导通控制方式,并利用LC串联谐振实现电路的能量交换,以达到简化电路拓扑,改善输出波形,减少谐波分量的目的。对双开关逆变器的工作原理进行了详细分析和PSPICE仿真,在此基础上设计了一台1kW/25kHz的实验样机。仿真和实验结果证明:与传统桥式逆变器相比,新型逆变器具有更优良的性能。 相似文献
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矩阵整流器功率特性研究 总被引:2,自引:0,他引:2
首先利用电路dq转换技术,基于电流空间相量算法推导了一种三相AC-DC MC,即矩阵整流器系统的完整dq变换模型,在此基础上进行了较为系统和全面的性能分析,包括功率特性分析,如电压利用率、输出电压极性、输入功率因数、有功功率、无功功率以及视在功率等性能指标,并绘制成图加以比较分析,便于对该变换器性能的认识.分析认为,该变换器是一种柔性的四象限三相AC-DC变换器,其特征为:①输出直流电压在负的最大值到正的最大值之间连续可调,最大值为输入相电压幅值的1.5倍,并依赖于输入电流位移和负载电阻;②功率开关电路部分等效成一个理想的变压器,能够调压和调流,同时能够进行前后级阻抗变换;③输入端有功功率、无功功率和输入功率因数都与输入电流调制度、输入滤波器参数、输入电流位移和负载电阻大小有关;④无功功率的调节能力依赖于有功功率的调节.还分析了单位输入功率因数的运行条件,划分了矩阵整流器四象限工作制及功率特性. 相似文献
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变频微波炉电源用LLC谐振变换器 总被引:1,自引:0,他引:1
研制了一款专为变频微波炉中磁控管供电的高频软开关电源。采用倍压输出式LLC谐振变换器作为该电源的主电路,并用基波分析法建立了其稳态基波等效电路模型;对其直流增益、谐振电流及零电压导通条件等进行了分析,并对高频变压器的电压比、品质因数、励磁电感、谐振电感及谐振电容等核心参数进行了优化设计。仿真和实验表明所建立的稳态电路模型及其理论分析是正确的,给出的谐振网络参数及其优化设计是正确的,这对于分析、研究和改进变频微波炉电源的设计及指导生产具有现实意义。 相似文献
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A contactless outlet for dc distribution systems is proposed. It uses an inductive contactless power transfer circuit with a series/parallel compensation circuit to prevent voltage fluctuation. However, the output voltage of the circuit rises in light load conditions. In this paper, the main circuit and control method for reducing the rise in output voltage and a method of estimating the output voltage are presented. The proposed circuit and methods were verified and evaluated experimentally using feedback control. 相似文献
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随着模块化电源系统的发展,开关电源并联技术的重要性日见重要。本文介绍一种新型并联型高频开关电源整流模块的系统设计方案,并对开关电源的驱动电路、缓冲电路、控制电路及主要磁元件进行优化设计。控制电路以UC3525为核心,构成电流内环、电压外环的双环控制模式,实现系统稳压和限流。并且通过小信号模型分析,对电压电流环PI调节器进行设计。 相似文献
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Power MOSFETs are fast-switching devices suitable for high-frequency operations. However, high-speed switching and circuit inductance may cause voltage spikes to appear across the device and damage it. Three types of voltage clamp circuits that can be used with power MOSFETs are considered, and their essential features and characteristics are studied. The different modes of operation with these clamp circuits are discussed, and the design equations to determine these parameters in each clamp circuit are presented. The losses in the three clamp circuits are evaluated and compared. One clamp circuit is shown to offer outstanding advantages and is found to be suitable for high-frequency applications such as PWM inverters. 相似文献
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