共查询到19条相似文献,搜索用时 171 毫秒
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提出了一种高压Buck转换器自举供电电路。该电路直接由芯片外部电源对自举电容充电,具有快速响应和大驱动电流等特点,满足大尺寸N型功率开关管的驱动要求。本设计适用于具有轻载高效模式的高压Buck转换器,在高端和低端开关管不工作时,能较好地对自举电容充电,解决了传统自举电路在低端管不工作时,无法稳定调节自举电压的问题。采用0.25 μm UMC工艺库仿真,结果显示,只需满足输入电压要求,即使低端开关管不工作,且负载具有较高电压时,该电路也能将自举电压维持在3.6 V以上,提高了转换器的可靠性。 相似文献
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P. Wood M. Battello N. Keskar A. Guerra 《电力电子》2005,3(4):73-76
对于每个给高端IGBTs提供门极脉冲的三个高端电路,高端和低端驱动器IC需要一个浮动的电源供电。一个获得浮动电源的非常方便的方法是使用自举电路。下图说明了三相开关逆变器驱动电路的其中一相的实现方法。该电路适用于每一相。 相似文献
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设计了一种易于集成、适用于驱动高侧N型开关管的栅极驱动器,该电路具有成本低、速度快、驱动能力强等特点,可以满足大尺寸高侧N型开关管的驱动需求。内置的、可持续工作的电荷泵能够驱动高侧N型开关管,使之恒定导通,解决了传统自举电路中低侧开关管不工作时高侧开关管输出电压不稳定的问题。该方案无需使用外置的自举电容,降低了栅极驱动器的使用成本和封装成本。采用0.18 μm BCD工艺进行设计,并成功流片。测试结果表明,该栅极驱动器可以驱动面积达0.5 mm2的高侧N型开关管,电路可靠性高。 相似文献
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介绍了一种适用于多相交错开关电容功率转换器的静态模型。分析了电容与电容之间的电荷传递行为,将开关电容功率转换器中的电荷再分配损耗和开关导通损耗等价地描述为电荷传递子过程的电压损失。该模型可以简便、准确地描述任意开关频率下开关电容功率转换器的等效输出电阻。同时,运用了一种新的“比例电流近似”方法,建立了带电流负载时的电荷传递模型,用以描述和分析负载和输出去耦电容对电容功率转换器静态特性的影响。相比于传统模型,提出的模型在中等开关频率下能准确地描述开关电容功率转换器的静态特性,同时能准确地描述多相交错控制中开关电容功率转换器的输出电压纹波。 相似文献
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为使DC/DC开关电源的功率开关管及时地导通或截止,需要设计专用的输出驱动电路,基于整个开关电源系统低功耗的考虑,开关电源可以采用同步整流的拓扑结构。该拓扑结构需要一个电压自举的输出驱动电路,本文首先提出了一种有自举功能的BiCMOS工艺的输出驱动电路,在此基础上,采用电流源和电流沉串联的方式改进了前面提出的输出驱动电路,通过消除CMOS电路的瞬态短路导通现象,不仅降低了该电路模块的功耗,而且起到了保护的作用,经HSPICE模拟表现,开关电源的输入电压Vin为10V控制器内部电压(VL)为5V,开关频率为200kHz时,改进驱动电路的功耗降低了约11.5%,同时避免了瞬态短路导通现象。 相似文献
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设计了一种适用于DC/DC转换器的自举升压电路.采用该电路可将功率PMOS管替换为NMOS管.在相同尺寸条件下,NMOS管具有较小的导通电阻,从而提高DC/DC转换器的效率.电路基于华宏NEC的0.35 μm BCD工艺,利用Cadence中的Spectre进行了验证.并给出了该自举电路的设计思想、电路的工作原理,以及自举电容最小值的计算.当电源电压降至1.4 V,电路仍能保持正常工作.当自举电容为10 nF,电源电压为5 V,工作频率可高达2 MHz. 相似文献
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A novel bootstrap driver circuit applied to high voltage buck DC–DC converter is proposed. The gate driver voltage of the high side switch is regulated by a feedback loop to obtain accurate and stable bootstrapped voltage. The charging current of bootstrap capacitor is provided by the input power of the DC–DC converter directly instead of internal low voltage power source, so larger driver capability of the proposed circuit can be achieved. The bootstrap driver circuit starts to charge the bootstrap capacitor before the switch node SW drop to zero voltage at high-side switch off-time. Thus inadequate bootstrap voltage is avoided. The proposed circuit has been implemented in a high voltage buck DC–DC converter with 0.6 µm 40 V CDMOS process. The experimental results show that the bootstrap driver circuit provides 5 V stable bootstrap voltage with higher drive capability to drive high side switch. The proposed circuit is suitable for high voltage, large current buck DC–DC converter. 相似文献
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A self-boost charge pump topology is presented for a floating high-side gate drive power supply that features high voltage and current capabilities for use in integrated power electronic modules (IPEMs). The transformerless topology uses a small capacitor to transfer energy to the high-side switch from a single power supply referred to the negative rail. Unlike conventional bootstrap power supplies, no switching of the main phase-leg switches is required to provide power continuously to the high-side gate drive, even if the high-side switch is permanently on. Additional advantages include low parts-count and simple control requirements. A piecewise linear model of the self-boost charge pump is derived and the circuit's operating characteristics are analyzed. Simulation and experimental results are provided to verify the desired operation of the new charge pump circuit. Guidelines are provided to assist with circuit component selection in new applications. 相似文献
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ABSTRACTAn interleaved frequency control soft switching converter is studied for solar power or fuel cell power applications. The proposed circuit topology contains two parallel current-fed circuit cells with interleaved pulse-width modulation operation. Thus, the ripple currents at input and output terminals are decreased. In each circuit cell, the proposed current-fed dc-dc converter includes boost circuit and resonant circuit to achieve current ripple-free on low voltage side and less switching losses on active devices. The boost circuit and the resonant circuit have same active devices to decrease power switches. Due to the resonant behaviour, the reverse recovery current loss on secondary diodes is removed. The voltage doubler circuit topology is accomplished on secondary-side to reduce diode counts and conduction loss. The performance and effectiveness of the developed interleaved PWM current-fed converter are verified and confirmed by experiments. 相似文献
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以光动力疗法基本知识为背景,根据光动力疗法的需求,设计了一个光功率便于调节的PDT反应室,首先,对PDT反应室中关键部分,产生光波的光源进行了研究与分析,对比各种光源的优缺点,确定了本设计要采用的光源——大功率LED;然后对反应室的电源电路,控制电路和LED驱动电路进行设计,用桥堆整流加电容滤波的原理制作出一个直流电源,为后续电路提供稳定的直流电压;采用单片机编程,通过键盘输入,控制输出高低电平的时间来控制LED驱动芯片的使能端,从而控制LED的点亮与熄灭的时间;选用芯片DD311作为本设计的LED驱动芯片,通过调节电路中的可调电阻,可调节LED的亮度,从而改变PDT反应室的提供的光照度。最后,对本装置的主要技术指标进行了测量。 相似文献
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Kazuki Nomura Daiju Kikuchi Nobuhiko Nakano 《Analog Integrated Circuits and Signal Processing》2014,78(1):3-9
In this paper, we propose a photovoltaic power supply for a stand-alone system that provides electrical generation and voltage boost functions on a single silicon chip. This power supply consists of solar cells, an oscillator, and a bootstrap charge pump, which are all designed in a 0.18 μm standard complementary metal-oxide semiconductor technology. Two types of solar cells are embedded in the system to improve its power efficiency. One type is used for the power supply and the other type is used to provide the voltage bias. Three different solar cells structures were designed. A pn structure and an np structure are used for the power supply cells and an npn series-connected structure is used for the oscillator circuit to operate the DC–DC converter The voltage-current characteristics of the solar cell under microscopic illumination have been measured and the performance of bootstrap charge pump circuits was confirmed. We remodeled our solar cell equivalent circuit to reflect these measurement results. 相似文献
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BUCK芯片中传统的自举电路都需要一个肖特基二极管,由于工艺限制,用普通二极管并联得到,这种做法很占芯片面积,不利于芯片集成。采用新颖的自举电路,用一个高压PMOS管代替了传统结构中的二极管,其电流导通能力更强,导通压降更小,并且能够在更广泛的工艺上实现。该电路还实现了整流管全集成供电,相对于用普通二极管做的自举电路模块节省了约8.9%的面积,并且进一步降低了功耗。电路基于0.5μm BCD工艺库,利用Cadence和Hspice软件进行电路仿真,在芯片系统典型应用环境下仿真得到BS引脚电压比LX引脚高约4.56 V,静态电流42.82μA。 相似文献
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This paper presents a new parallel three-level soft switching pulse-width modulation (PWM) converter. The proposed converter has two circuit cells operated by the interleaved PWM modulation. Thus, the ripple currents at input and output sides are reduced. Each circuit cell has two three-level zero voltage switching circuits sharing the same power switches. Therefore, the current and power rating of the secondary side components are reduced. Current double rectifier topology is selected on the secondary side to decrease output ripple current. The main advantages of the proposed converter are soft switching of power switches, low ripple current on the output side and low-voltage rating of power switches for medium-power applications. Finally, the performance of the proposed converter is verified by experiments with 1 kW prototype circuit. 相似文献