开关电源全波整流输出结果的对比研究

采用脉宽调制方波作为输入信号,对全桥和半桥驱动型开关电源的输出电压、效率和纹波系数都做了对比分析和研究。并研究了不同频率、占空比以及不同范围的负载电阻对两种工作电路的影响,分析了两种电路各自的优缺点。实验结果表明,半桥驱动型开关电源,在一定程度上限制了驱动电路的最大输出功率,因此在要求大功率输出时还要采用全桥驱动电路。而且全桥工作的效果也要比半桥好,稳定性更强,可为电路的设计提供一个参考。     

Design of adaptive dead-time control circuit for resonant half-bridge driver

To decrease the switching loss and the dead-time effect of resonant half-bridge inverter, a novel adaptive dead-time control circuit of resonant half-bridge driver Integrated Circuit (IC) is presented. Without increasing the pin number of IC, this circuit takes a novel strategy to adaptively regulate dead time to a temperate range between high and low thresholds. The high and low thresholds are adaptive to the fall time of output signal in a half-bridge clock cycle. The IC of the designed circuit is suitable for high-voltage applications. The dead-time regulation range of this circuit achieves 0–3.5?µs. The range of temperate dead-time state is 300?ns. The failure signal of this circuit can protect the IC and peripheral power devices by regulating operation in three clock cycles. Both simulation and measurement of the proposed circuit in a half-bridge driver IC with an operating frequency at 50?kHz are presented based on the 0.5?µm 700?V BCD process. The results of simulation and measurement show that the presented circuits’ performance is perfect.     

一种GaN半桥驱动器电平移位电路设计

GaN半桥输出点电压在死区时间为负值,给GaN功率器件栅极驱动电路信号通信带来了挑战.通过研究驱动器电平移位锁存电路工作状态与半桥功率级输出节点电压跳变、死区时间负压之间的相互影响,设计了一种新型的零静态功耗电平移位电路及其误触发消除电路.电路采用100 V BCD 0.18μm工艺设计,在输入电压100V、开关频率5...     

数字控制感应加热电磁炉的设计

设计了基于DSP的大功率数字控制感应加热电磁炉,该系统采用DSP作为控制核心,主电路采用半桥谐振逆变电路,外围电路包括过流、过压、欠压、过功率和故障报警等保护电路。详细分析了半桥谐振逆变电路的工作原理,给出了其负载工作在感性、容性和电阻状态下的电路工作条件,并选择电路工作在感性状态才能确保主电路安全可靠的工作。最后制作了样机并给出了实验结果,实验结果验证了理论分析的正确性。     

A novel single-stage half-bridge AC-DC converter with high powerfactor

A new single-stage AC-DC power converter based on a half-bridge converter suitable for low-power applications is proposed. The proposed converter offers high power factor and direct conversion from the line voltage to an isolated DC output voltage. High power factor is achieved by adding a resonant circuit between the rectifying diodes and half-bridge leg. For soft switching, a half-bridge series-loaded resonant converter is adopted as a DC-DC converter part. A prototype is built and tested to show the validity of the proposed converter     

微型计算机开关电源静态检修法

对开关电源电路的常见故障进行了分析,介绍了一种半桥驱动型开关电源电路的故障检修思路和开关电源电路静态检修法.     

MOS Integrated silicon pressure sensor

An MOS integrated silicon-diaphragm pressure sensor has been developed. It contains two piezoresistors in a half-bridge circuit, and a new simple signal-conditioning circuit with a single NMOS operational amplifier. The negative temperature coefficient of the pressure sensitivity at the half-bridge is compensated for by a positive coefficient of the variable-gain amplifier with a temperature-sensitive integrated feedback resistor. The sensor was fabricated using the standard IC process, except for the thin diaphragm formation using the N2H4. H2O anisotropic etchant. Tile silicon wafer was electrostatically adhered to the glass plate to minimize induced stress. The -1750 ppm/°C temperature coefficient of sensitivity at the half-bridge was compensated for to less than +190 ppm/°C at the amplifier output in the 0- 70°C range. A less than 20-mV thermal-output offset shift was also Obtained after 26-dB amplification in the same temperature range.     

A novel high-performance utility-interactive photovoltaic inverter system

This paper presents a novel photovoltaic inverter that cannot only synchronize a sinusoidal AC output current with a utility line voltage, but also control the power generation of each photovoltaic module in an array. The proposed inverter system is composed of a half-bridge inverter at the utility interface and a novel generation control circuit which compensates for reductions in the output power of the system that are attributable to variations in the generation conditions of respective photovoltaic modules. The generation control circuit allows each photovoltaic module to operate independently at peak capacity, simply by detecting the output power of the system. Furthermore, the generation control circuit attenuates low-frequency ripple voltage, which is caused by the half-bridge inverter, across the photovoltaic modules. Consequently, the output power of the system is increased due to the increase in average power generated by the photovoltaic modules. The effectiveness of the proposed inverter system is confirmed experimentally and by means of simulation.     

大功率LED驱动谐振电路设计

通过分析对比大功率LED驱动电路的拓扑结构,采用LLC谐振拓扑,提出了一种适用于宽范围恒流输出的设计方法,并进行了效率优化。LLC半桥谐振变换器可在全负载范围内实现功率开关管的零电压开通（ZVS）和整流二极管的零电流关断（ZCS）,以此减小开关损耗。并且采用基波近似方法分析LLC谐振变换器,通过交流等效电路,导出了归一化直流增益曲线,讨论了半桥LLC的三种主要工作方式,以及对应的三个工作区间,分析了每个工作区间的特点和应用场合。     

基于UC3825的半桥变换器分析

利用UC3825芯片构成了PWM控制的半桥变换器，给出了电压补偿网络和电流保护等重要的外围电路的工程设计方法，通过实验验证了电路的有效性。结果表明，该变换器功率可达81%，输出电压纹波在2%以内，电流保护可靠，电路工作稳定。     

A Nonisolated Single-Phase UPS Topology With 110-V/220-V Input–Output Voltage Ratings

A circuit configuration of a single-phase nonisolated online uninterruptible power supply (UPS) with 110-V/220-V input–output voltage ratings is proposed, allowing the bypass operation without a transformer even if the input voltage is different from the output voltage. The converter consists of an ac–dc/dc–dc three-level boost converter combined with a double half-bridge inverter. In this type of configuration size, cost and efficiency are improved due to the reduced number of switches and batteries, and also, no low-frequency isolation transformer is required to realize bypass operation because of the common neutral connection. Both stages of the proposed circuit operate at high frequency by using a passive nondissipative snubber circuit in the boost converter and insulated-gate bipolar-transistor switches in the double half-bridge inverter, with low conduction losses, low tail current, and low switching losses. Principle of operation and experimental results for a 2.6-kVA prototype are presented to demonstrate the UPS performance.      

Half-bridge inverter using 4H-SiC gate turn-off thyristors

This paper reports on the first demonstration of a half-bridge power inverter constructed from silicon carbide gate turn-off thyristors (GTOs) operated in the conventional GTO mode. This circuit was characterized with input bus voltages of up to 600 VDC and 2 A (peak current density of 540 A/cm²) with resistive loads using a pulse-width modulated switching frequency of 2 kHz. We discuss the implications of the thyristor's electrical characteristics and the circuit topology on the overall operation of the half-bridge circuit. This work has determined the conservative critical rate of rise value of the off-state voltage to be 200 V/μs in these devices     

高压谐振控制器L6599在LLC半桥谐振变换器中的应用

介绍了高压谐振控制器1．6599的基本原理及内部组成,简要叙述了LLC半桥谐振变换电路的工作原理及数学模型,详细说明了L6599在LLC半桥谐振变换器中的典型应用,并给出了相关实验波形图。     

一种有源钳位的半桥Boost变换器的研究

Boost电路和半桥、全桥电路相结合的电流馈电DC-DC变换器被广泛地使用在UPS、燃料电池等低输入电压、高输出电压的系统中。文中介绍了一种新型的有源钳位电路,在实现有源钳位的同时对所有的开关管实现了ZVS开通,提高了变换器的效率。     

一种实用型直流电机控制电路的设计

介绍了由半桥驱动电路以及转向控制电路构成的一种新型、结构简单、调试方便、实用的直流电机控制电路的实现方法,并阐述了电路的组成以及设计过程。实践证明,该套直流电机控制电路能克服传统的H桥控制电路中结构复杂、死区时间不易控制的问题,特别在大功率电机的控制方面该系统具有比传统H桥控制电路更优良的工作性能。     

微机开关电源的特点和检测方法

研究了微机中具有代表性的半桥脉宽式开关电源的电路的电路特点,提出了简捷、合理的检修方法和步骤,以及关键测试点的经验数据和波形图。     

FAN7384半桥驱动集成电路及应用

FAN7384是美国飞兆半导体公司推出的用于驱动MOSFET和IGBT功率器件的半桥驱动集成电路,具有多种保护功能.文中详细介绍了FAN7384的功能特点和典型应用电路.     

Load-resonant converter with zero current switching and variableoutput power

The authors present a half-bridge series-parallel load-resonant converter in which the resonant circuit has been designed so that the circuit can operate near to resonance over a wide frequency range. The output power of the circuit varies continuously over this frequency range, resulting in a load-resonant converter with zero current soft-switching over a range of output power. The prototype constructed shows a power variation of 2:1 over a frequency range of 30 kHz     

Active-clamp snubbers for isolated half-bridge DC-DC converters

In conventional isolated half-bridge dc-dc converters, the leakage-inductance-related losses degrade converter efficiency and limit the ability to increase the converters' switching frequencies. In this paper, a novel active-clamp snubber circuit for half-bridge dc-dc converters is proposed to recycle the energy stored in the leakage inductance by transferring this energy to a capacitor with zero-voltage zero-current-switching switched auxiliary switches, such that body-diode conduction of primary-side main switches are prevented and primary side ringing are attenuated resulting in improved converter efficiency. Principles of operation and simulation analysis are presented and supported by experimental results that show significant improvement in efficiency.     

基于双向半桥DC-DC的超级电容器储能系统仿真研究

引入了双向半桥DC—DC变换器对超级电容器进行充放电的换流方式;阐述了超级电容器在双向半桥DC—DC变换器工作原理;分析了单端稳压和稳压快速充电两种控制策略,并给出了双闭环控制的原理框图;最后搭建了以直流电机为负载的上述两种控制策略下的仿真系统,通过设定电机运行多种工况,完整地考察了超级电容与位能负载间的多种换流情况。仿真结果验证了该变换电路不仅能够实现馈能的完全吸收,还具有较’陕速的放电过程动态响应,且电路简单,易于工程实现,满足了位能型负载下超级电容器储能系统的变换要求。