共查询到19条相似文献,搜索用时 171 毫秒
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在开关电源中,加入有源功率因数校正电路,可使功率达到0.99以上,并把电源输入电流的波形失真减小到5%以上,大大减小开关电源对电网的污染。 相似文献
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本文主要介绍了有源功率因数校正(APFC)的工作原理、电路分类。设计了基于UC3854B芯片的一种有源功率因数校正电路方案。着重分析了电路参数的选择和设计。实践证明采APFC后,大大减小了输入电流的谐波分量。实现了功率因数校正。 相似文献
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有源功率因数校正可减少用电设备对电网的谐波污染,提高电器设备输入端的功率因数。详细分析了有源功率因数校正APFC(active power factor corrector)原理,采用平均电流控制模式控制原理,设计了基于UC3854BN芯片的一种有源功率因数校正电路方案,着重分析了电路主要参数的选择和设计。实践证明,采用APFC后,大大减小了输入电流的谐波分量,实现了功率因数校正。 相似文献
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文中详细分析了单周期控制电路的原理,介绍了IR1150芯片的特点、结构、工作原理以及典型应用电路。IR1150功率因数校正控制芯片采用单周期控制技术(One-Cycle Control,OCC),无需传统PFC芯片的电压采样以及模拟乘法器,大大简化了PFC电路的设计和减小产品体积、降低成本。 相似文献
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本文介绍了开关电源功率因数校正的基本原理,剖析了有源功率因数校正电路的结构、原理,对比各类APFC的特点,并概括了有源功率因数校正技术的发展方向. 相似文献
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使用有源功率因数校正技术可有效抑制电网电流谐波和提高开关电源功率因数。文中分析了临界导电模式Boost型功率因数校正电路的电路结构及其工作原理,应用反馈控制理论,研究了功率因数校正环节的控制特性,给出了其电路参数的设计方法,保证在电网电压和负载功率大范围变化时,功率因数维持在0.99 以上。 相似文献
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单相两级有源功率因数校正变换器的研究 总被引:1,自引:0,他引:1
文中对两级有源功率因数校正变换器进行研究,设计了一台510W两级式开关电源。该电源前级采用平均电流控制的Boost型PFC电路,实现功率因数校正;后级采用不对称半桥型DC/DC变换器,实现开关管的零电压开关。控制电路采用PFC/PWM复合控制芯片ML4824,缩小电源体积。通过实验证实该开关电源具有高功率因数与高效率的特点。 相似文献
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基于单周期控制专利技术的IR1150型功率因数校正控制电路及其应用 总被引:4,自引:0,他引:4
IR1150是一种在宽范围输入线路电压下以连续导电模式(CCM)工作的功率因数校正(PFC)控制IC.IR1150基于IR公司的"单周期控制"(OCC)专有技术,为PFC提供低成本解决方案.文中介绍IR1150的结构、特点和工作原理,给出其典型应用电路. 相似文献
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基于IR1150的功率因数校正电路的研究 总被引:1,自引:0,他引:1
阐述了功率因数校正原理,设计了以IR1150为核心的系统主电路及控制电路,并对主电路的参数进行了详细分析和计算。实验证明,系统的参数设计准确有效,系统的输入功率因数(PF)达到0.99以上,总谐波畸变(THD)在10%以下。系统性能良好,输出电压在较宽的输入电压范围内均能保持稳定。 相似文献
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Renewable energy, such as solar energy, is desirable for power generation due to their unlimited existence and environmental friendly nature. However, the high initial investment impedes its wide commercialization. This paper proposes a cost-effective single-stage inverter with maximum power point tracking (MPPT) in combination with one-cycle control (OCC) for photovoltaic power generation. This control scheme is based on the output current-adjusting feature of OCC. The output current of the inverter can be adjusted according to the voltage of the photovoltaic (PV) array so as to extract the maximum power from it. In the mean time, OCC guarantees that the output current is proportional and in phase with the grid voltage. All these are accomplished in one power stage and a simple control circuit. No detection and calculation of power are needed. Compared with previously proposed approaches, this method is much more efficient and cost-effective and yet exhibits excellent performance. The principle is explained qualitatively and extensive experiments have been carried out to verify the proposed method. 相似文献
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Abdellatif M. Aboutaleb Haitham Z. Azazi Dina S. M. Osheba Awad E. El-Sabbe 《International Journal of Electronics》2020,107(7):1063-1082
ABSTRACT This paper introduces a Four-Switch Three-Phase Shunt Active Power Filter (FSTP-APF) based on One Cycle Control (OCC) technique for compensating the currents of three phase non-linear loads. The power stage of FSTP-APF uses only four semiconducting switches which leads to reduce the overall cost of APF. The proposed technique retains the advantages of the conventional OCC, such as no reference current calculation, no need for using Phase-Locked Loop (PLL), very simple control circuit and constant switching frequency. In addition, the modification reduces the number of semiconductor switches, reduces the filter output inductances, reducing the number of sensors to only four sensors, two of them for measuring supply currents and the others for measuring DC-link voltages, and the control algorithm becomes simpler. The feasibility and performance of the proposed technique are demonstrated through the simulation and experimental verifications. 相似文献
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Jun Mei Can Huang You Xu Tian Ma Qinran Hu 《International Journal of Electronics》2013,100(9):1483-1499
This paper customises the classic one-cycle control (OCC) scheme for modular multilevel rectifiers (MMRs) and overcomes the inherent defect of the OCC. To be specific, a hybrid one-cycle control scheme is proposed combining the OCC and the virtual loop mapping (VLM). First, on the basis of the classic OCC and the volt-second equivalence principle, the relationships between the MMR arm equivalent duty cycle and the sub-module (SM) duty cycle are derived. Then, by making use of VLM methods, the switching frequency of the SM is reduced and the dynamic capacitor voltage balance is obtained as well. Further, to achieve the single-line-to-ground fault-tolerance capability and eliminate the second harmonic ripple in the DC voltage, the constant power control is presented using the negative-sequence voltage compensation. Specifically, the whole control scheme only needs one proportional integration controller, which greatly reduces the complexity of system control and the system cost. The validity of the proposed scheme is verified through simulation and experimental studies. 相似文献