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分析了具有耦合滤波电感的多输出正激式开关电源电路,对比了有耦合和无耦合滤波电感对电路参数的影响,介绍了耦合滤波电感的设计方法。 相似文献
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文章介绍了一种基于UC3844集成芯片实现双管反激多路输出的电路,分析了电路的工作原理,并介绍了电路的控制设计方法。实验结果表明,该电源可靠性高、稳定性好。 相似文献
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介绍了一种大功率电流型控制反激DC/DC变换器的设计与实现,并提出了一种更简洁的储能式变压器的设计方法,设计并研制成功1kW 27V/190V样机,具有过载短路能力强、体积小、重量轻等优点。 相似文献
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本文详细分析了多输出单端反激电源的工作过程,分析了电路参数对输出电压负载效应的影响,并提出了一些改善电压负载效应的方法。 相似文献
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以UC3842电流型控制芯片为核心,以MOSFET IRFPG40作为功率开关器件,设计及研制了一种单端反激式、双闭环电流控制、5路稳定电压输出的40W开关稳压电源,用作于变频器逆变侧IPM模块的专用驱动电源以及其他外围电路工作电源,实验证明所设计的开关电源具有高稳定性。 相似文献
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SG3525在使用时,传统模式使用额外的直流电源对SG3525供电.在矿用直流变换器控制电路的设计上,对传统模式进行改进,设计了SG3525辅助电源电路,使直流变换器具备了自启动功能.同时利用其软启动引脚设计了欠压和过流保护,并对电压调节器进行了设计,减小了直流变换器的输出电压纹波.实验证明该方案可靠、有效. 相似文献
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Dynamic model development and control for multiple‐output flyback converters in DCM and CCM 下载免费PDF全文
Hossein Delavaripour Behzad Mirzaeian Dehkordi Ehsan Adib Hossein Abootorabi Zarchi 《International Journal of Circuit Theory and Applications》2018,46(6):1228-1248
Multiple‐output flyback converters are widely used in switching power supplies due to their low component count and cost‐effective structure. The main problem of this structure is how to balance output voltages in different load conditions. This paper proposes a new approach for single‐input multiple‐output flyback converters operating in DCM and CCM by a small‐signal averaged model. The averaged model is derived by presenting the piecewise‐linear waveform for the inductor currents inside the converter. In DCM, the magnetizing current and currents through the output windings reach zero when the switch is turned off. In CCM, the magnetizing current of the converter is continuous over a switching interval and this possibility exists that only some of the output diodes completely conduct when the switch is off. The proposed model of the converter can be used in a wide range of operations within identical and non‐identical loading conditions. Using a laboratory prototype, several case studies and input‐to‐output transfer functions are considered to verify the proposed model. The controller design is performed for the both CCM and DCM, and then dynamic characteristics of the overall system are evaluated. 相似文献
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Dakshina Murthy‐Bellur Marian K. Kazimierczuk 《International Journal of Circuit Theory and Applications》2011,39(11):1145-1160
The two‐switch flyback DC‐DC converter is an extended version of the conventional single‐switch flyback converter. An additional switch and two clamping diodes serve as a simple, but an effective way to limit the switch overvoltages, which occur in the conventional single‐switch flyback converter due to the ringing of the resonant circuit formed by the transformer leakage inductance and the transistor output capacitance. The clamping diodes in the two‐switch flyback topology clamp the maximum voltage across each switch equal to the DC input voltage. This paper presents a detailed steady‐state analysis and design procedure of the diode‐clamped two‐switch flyback converter operated in continuous‐conduction mode (CCM). The power loss in each component of the two‐switch flyback converter is compared with those of the single‐switch flyback converters with and without RCD clamp, and is presented in a tabular form. The two‐switch flyback converter was bread‐boarded to validate the theoretical analysis. Experimental results from a 10 V/30 W, 100 kHz laboratory prototype verified that the maximum switch voltage is limited to the DC input voltage. Copyright © 2010 John Wiley & Sons, Ltd. 相似文献
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详细分析了断续导电模式(DCM)反激功率因数校正(PFC)变换器和临界连续导电模式(CRM)反激PFC变换器实现功率因数校正的工作原理.通过推导DCM和CRM反激PFC变换器的输入电流的表达式,证明2种变换器都可以实现PFC功能.进一步推导DCM和CRM反激PFC变换器的输出电压纹波峰峰值的表达式,揭示了工作模式对PFC变换器的输出电压纹波的影响,发现CRM反激PFC变换器的输出电压纹波峰峰值比DCM反激PFC变换器的输出电压纹波峰峰值小.最后通过仿真和实验验证了理论推导的正确性. 相似文献