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为保证系统在热插拔过程中安全工作,避免因之导致系统崩溃及系统与部件的损坏,提出一种热插拔控制芯片的设计.针对热插拔过程中可能产生的浪涌电流和过流、过压等故障现象,芯片设计中设置了多重保护功能,包括自动限制启动电流,过流时切断电路以及过压时断电,长时过压触发SCR为负载提供撬棒保护等.另外,设计了低压诊断、负载电压等检测功能.由于芯片工作中涉及较高电压和较大电流,电路采用BCD工艺(bipolar-CMOS-DMOS)实现,并对系统、电路和版图进行了优化.制得的芯片面积约为2.5mm×2.0mm,可在4.5~16.5V电压范围内正常工作,12.0V电源电压下芯片功耗约为18mW.对芯片的测试结果表明,所设计的电路功能和特性已成功实现. 相似文献
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为保证系统在热插拔过程中安全工作,避免因之导致系统崩溃及系统与部件的损坏,提出一种热插拔控制芯片的设计.针对热插拔过程中可能产生的浪涌电流和过流、过压等故障现象,芯片设计中设置了多重保护功能,包括自动限制启动电流,过流时切断电路以及过压时断电,长时过压触发SCR为负载提供撬棒保护等.另外,设计了低压诊断、负载电压等检测功能.由于芯片工作中涉及较高电压和较大电流,电路采用BCD工艺(bipolar-CMOS-DMOS)实现,并对系统、电路和版图进行了优化.制得的芯片面积约为2.5mm×2.0mm,可在4.5~16.5V电压范围内正常工作,12.0V电源电压下芯片功耗约为18mW.对芯片的测试结果表明,所设计的电路功能和特性已成功实现. 相似文献
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直流电子负载是一种通过电子电路实现欧姆定律的受控有源电阻电路,主要91于直流稳压源的智能化检测。直流电子负载通过控制内部功率器件MOSFET或晶体管的导通量,使功率管消耗功率,可以模拟各种不同的负载状况,一般具有定电流、定电压、定电阻、定功率、短路及动态负载等多种模式。简易直流电子负载系统设计以c8051F350单片机为控制核心,使用芯片内置的24位AD转换电路实现模拟电压和电流信号的数字化测量、控制与显示,外围电路主要包括恒流电路、电压电流取样电路、LCD显示电路等。主要性能有:能设定恒流电流值,显示被测电源的输出电压值、电流值以及电源的负载调整率等。其恒流电子负载的电流设置范围为100mA~1000mA,分辨率为10mA。在电子负载两端电压变4g10V时,输出恒流变化的绝对值小于0.1%。系统具有过压保护功能,过压阈值保护电压为10V到30V可设。 相似文献
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基于RT8482的大功率LED驱动电路设计 总被引:1,自引:1,他引:0
根据发光二极管的V-I特性,设计了一款基于RT8482芯片的升压恒流大功率LED驱动电路,其输出电压自适应。该电路主要包括输入电源反接保护单元、LED升压恒流驱动单元、PWM数字调光与变阻模拟调光单元、扩流输出单元等,电路同时还具有过压保护、过流保护等功能。测试结果及实际使用表明:该电路在12V输入电压下驱动84w大功率白色LED灯珠阵列时输出电流恒定,其效率可达89.16%,且亮度调节范围宽、精度高,适用于通用与景观照明、汽车照明、室内装饰及电子设备背光等大功率LED照明应用领域。 相似文献
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A Hot-Swap Solution for Paralleled Power Modules by Using Current-Sharing Interface Circuits 总被引:1,自引:0,他引:1
A hot swap of power modules is required by high-availability parallel power module systems. With the hot-swappable paralleled power modules, the system up-time can be maximized, the system maintenance and repair can be simplified, and the system upgrade can be allowed for. In this paper, a simple hot-swap solution is proposed for the paralleled power modules which use current-sharing (CS) interface circuits to do the CS work. By redesigning the basic function circuits of the CS interface circuits (such as the under voltage protection circuit, the current-sharing circuit, and the light load protection circuit etc.), an additional hot-swap function can be implemented "parasitically". There is no extra hot-swap controller and no compatibility problem between the hot-swap and CS solutions used. A prototype CS interface circuit with a "parasitic" hot-swap function was designed, implemented, and tested. The results show that the proposed hot-swap solution is feasible and suitable 相似文献
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分析了混合集成DC/DC变换器的电路和工艺特点,结合高可靠混合集成DC/DC变换器的设计应用要求,提出了一种适用于高可靠混合集成DC/DC变换器的限流和短路保护电路。从原理上阐述了限流和短路保护的设计方法,给出了具体电路和仿真数据。结合实际电路测试数据,提出了类似电路设计中的改进措施。 相似文献
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For most triboelectric nanogenerators (TENGs), the electric output should be a short AC pulse, which has the common characteristic of high voltage but low current. Thus it is necessary to convert the AC to DC and store the electric energy before driving conventional electronics. The traditional AC voltage regulator circuit which commonly consists of transformer, rectifier bridge, filter capacitor, and voltage regulator diode is not suitable for the TENG because the transformer''s consumption of power is appreciable if the TENG output is small. This article describes an innovative design of an interface circuit for a triboelectric nanogenerator that is transformerless and easily integrated. The circuit consists of large-capacity electrolytic capacitors that can realize to intermittently charge lithium-ion batteries and the control section contains the charging chip, the rectifying circuit, a comparator chip and switch chip. More important, the whole interface circuit is completely self-powered and self-controlled. Meanwhile, the chip is widely used in the circuit, so it is convenient to integrate into PCB. In short, this work presents a novel interface circuit for TENGs and makes progress to the practical application and industrialization of nanogenerators. 相似文献
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Khondker Zakir Ahmed Syed Mustafa Khelat Bari Didar Islam A. B. M. Harun-ur Rashid 《Analog Integrated Circuits and Signal Processing》2012,71(3):349-358
This paper presents the design and implementation of a low voltage DC?CDC asynchronous boost regulator that works in PFM (pulse frequency modulation) mode. The booster is designed to supply low load condition of up to 20 mA with high efficiency. The total bias current of the chip is only 5 ??A when operating with 1 mA load and the number goes to maximum of 18 ??A with maximum load condition of 20 mA. The ultra low bias current enables the chip to maximize its efficiency in the entire load range. The chip features on-chip over current protection scheme and thermal protection scheme. The boost regulator is implemented in 0.5 ??m BiCMOS process technology. The maximum measured efficiency of the fabricated chip is 86%. 相似文献