共查询到20条相似文献,搜索用时 31 毫秒
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Montree Kumngern Boonying Knobnob Kobchai Dejhan 《Circuits, Systems, and Signal Processing》2010,29(5):815-836
In this paper, a new high frequency and high precision half-wave rectifier circuit which is very suitable for CMOS technology implementation is presented. The system comprises a voltage to current converter, a dual output precision current-mode half-wave rectifier, and two current to voltage converters. An input voltage signal is converted into a current signal by using a current conveyor and a MOS resistor. The current signal is rectified using a dual output class-AB precision rectifier cell and then converted into two output voltages by using grounded MOS resistors. This class-AB current-mode precision rectifier is employed for providing high frequency performance. Simulated rectifier results based-on a 0.5 µm CMOS technology with ±1.2 V supply voltage demonstrates very high operating frequency, very precise rectification and good temperature stability. 相似文献
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Feng Su Wing-Hung Ki Chi-Ying Tsui 《Solid-State Circuits, IEEE Journal of》2008,43(4):815-822
An integrated DC-DC hysteretic buck converter with ultrafast adaptive output transient response for reference tracking is presented. To achieve the fastest up-tracking speed, the maximum charging current control is introduced to charge up the output voltage with the maximum designed current. For down-tracking, the output is discharged by the load only to save energy. Although the converter works with hysteretic voltage mode control, an adaptive delay compensation scheme is employed to keep the switching frequency constant at 850 kHz to within plusmn2.5% across the whole operation range. The integrated buck converter was fabricated using a 0.35 mum CMOS process. With an input voltage of 3 V, the output voltage can be regulated between 0.5 and 2.5 V. With a load resistor of 10 Omega, the up-tracking speed of the maximum reference step (0.5 to 2.5 V) is 12.5 mus/V. All design features are verified by extensive measurements. 相似文献
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Two new square-rooting circuits, based on second-generation current-controlled current conveyors (CCCIIs), are presented. The first square-rooting circuit consists of two CCCIIs, one current-controlled resistor and two grounded resistors. The input signal of the first circuit is a voltage, and output is the voltage proportional to the square root of input voltage. The second one consists of two CCCIIs and a current-controlled resistor. In the second circuit, the input signal is a current, and output is the current proportional to the square root of input current. Each circuit realizes by using a current-mode technique; hence the proposed square-rooting circuits are simple circuitry, wide dynamic range and wide bandwidth. The proposed square-rooting circuits were confirmed by using PSPICE simulation. 相似文献
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Bryant B. Kazimierczuk M.K. 《IEEE transactions on circuits and systems. I, Regular papers》2005,52(10):2158-2164
This paper presents the analysis of open-loop power-stage dynamics relevant to current-mode control for a boost pulsewidth-modulated (PWM) dc-dc converter operating in continuous-conduction mode (CCM). The transfer functions from input voltage to inductor current, from duty cycle to inductor current, and from output current to inductor current are derived. The delay from the MOSFET gate drive to the duty cycle is modeled using a first-order Pade/spl acute/ approximation. The derivations are performed using an averaged linear small-signal circuit model of the boost converter for CCM. The transfer functions can be used in modeling the complete boost PWM converter when current-mode control is used. The theory was in excellent agreement with the experimental results, enforcing the validity of the transfer functions derived. 相似文献
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《IEEE transactions on circuits and systems. I, Regular papers》2008,55(8):2178-2187
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Bryant B. Kazimierczuk M.K. 《IEEE transactions on circuits and systems. I, Regular papers》2006,53(1):99-105
A new transfer function from control voltage to duty cycle, the closed-current loop, which captures the natural sampling effect is used to design a controller for the voltage-loop of a pulsewidth modulated (PWM) dc-dc converter operating in continuous-conduction mode (CCM) with peak current-mode control (PCM). This paper derives the voltage loop gain and the closed-loop transfer function from reference voltage to output voltage. The closed-loop transfer function from the input voltage to the output voltage, or the closed-loop audio-susceptibility is derived. The closed-loop transfer function from output current to output voltage, or the closed loop output impedance is also derived. The derivation is performed using an averaged small-signal model of the example boost converter for CCM. Experimental verification is presented. The theoretical and experimental results were in good agreement, confirming the validity of the transfer functions derived. 相似文献
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介绍了利用CSMC 0.6μm CMOS工艺实现的、应用于电流模逻辑电路中的高线性度电压电流转换(VTC)电路。该电路采用了高增益两级运算放大器,以及工作在弱反型区的MOS管电压电流呈指数律关系实现的PTAT基准电流源。详细分析了电阻与运算放大器的非线性影响因素。测试结果表明,输出的总谐波失真为0.0002%,输入动态范围为0~2.6V,输出电流为50~426μA,PTAT基准电流源对电源变化的灵敏度为0.0217。芯片采用5V供电,功耗约为1.3mW,芯片面积为0.112mm2。 相似文献
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提出了一种高稳定性的电流型DC-DC转换器.首先应用一种新型的电流型转换器的模型推导了控制环路的增益表达式,在分析其环路增益的基础上,提出了一种新颖的控制环路频率补偿的方法,从而使转换器的稳定性不受负载电流和电源电压变化的影响.其次应用这种新的频率补偿方法,使用0.5μm-CMOS工艺设计了一种电流模式的降压型转换器.仿真结果表明,该稳压器具有高度的稳定特性,其稳定性与负载和电源电压无关.并且由于这种新的频率补偿为环路提供了极高的带宽,所以该转换器具有优异的动态响应.其提供的全负载瞬态响应的建立时间小于5μs,过冲电压小于30mV. 相似文献
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设计了一种输出功率约50W的LED恒流源驱动模块,其负载为由多只LED管(每只功率为1W)采用混联方式组成的LED阵列。通过对其电流型反激式变换及恒流控制电路的设计与试制,并在不同输入电压下,改变负载测试,可看出其电流变化规律基本相似。随着负载变小,输出电压升高,输出电流逐渐减小,输出电流稳定度达4.6%。在一定负载时,输出电压值保持在47.2V左右,电压纹波峰-峰值约为400mV。电流波动约0.05A,输出电流稳定可靠,可用于对多只串并混联的LED阵列驱动供电。 相似文献
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Figueres E. Benavent J.M. Garcera G. Pascual M. 《Industrial Electronics, IEEE Transactions on》2007,54(3):1272-1281
A load-current-injection control technique for boost-derived power-factor-correction (PFC) rectifiers with average current-mode control is proposed in this paper. By adding a load-current loop to the conventional inductor current loop, the output voltage response to load steps is speeded up, almost eliminating the typical voltage overshoots of this kind of converters. Although the techniques based on the load-current injection are traditionally called "load feedforward," this paper shows that an additional feedback loop, which modifies the linear small-signal model of the converter, is also introduced. In order to validate the concept, a converter prototype working from a universal input line has been designed and tested, showing that a very fast dynamic response of PFC rectifiers may be achieved in a cost-effective way 相似文献
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设计了一种输出功率约50W的LED恒流源驱动模块, 其负载为由多只LED管(每只功率为1W)采用混联方式组成的LED阵列。通过对其电流型反激式变换及恒流控制电路的设计与试制, 并在不同输入电压下, 改变负载测试, 可看出其电流变化规律基本相似。随着负载变小, 输出电压升高, 输出电流逐渐减小, 输出电流稳定度达4.6%。在一定负载时, 输出电压值保持在47.2V左右, 电压纹波峰-峰值约为400mV。电流波动约0.05A, 输出电流稳定可靠, 可用于对多只串并混联的LED阵列驱动供电。 相似文献
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Interleaved converters operation based on CMC 总被引:1,自引:0,他引:1
A new family of low-ripple DC-to-DC switching converters based on a parallel connection of N-identical boost converters with current-mode control (CMC) is presented. The CMC strategy ensures that all the converters operate at the same duty cycle, sharing an equal amount of input current and forcing the output voltage to be an integer multiple (N) of the input voltage. As a result, the total input current and output voltage ripples are extremely low. The generation of control signals from inductor currents feedback without using external triangular or sawtooth signals is another characteristic of the new converter family 相似文献
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A novel method for programming current in dc/dc converters operating in discontinuous conduction mode is described in this paper. The control variable is the product of the square of the duty cyle and the switching period, i.e., D/sup 2/T, which is directly proportional to input and output currents of a discontinuous-mode converter. A method of controlling D/sup 2/T is applied to converters that utilize one switch (or one set of synchronous switches) for achieving two control functions. In particular a single-switch two-output boost converter, in which a continuous-mode converter and a discontinuous-mode converter share one active switch, is studied. In this system, current-mode control is used to regulate the output voltage of the continuous-mode converter and the proposed D/sup 2/T control is used to regulate the other discontinuous-mode converter. The result is a generic current-mode controlled two-output converter. 相似文献
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Chan-Soo Lee Munkhsuld Gendensuren Jae-Ho Choi Joong-Ho Choi 《International Journal of Electronics》2013,100(12):1623-1634
A current-mode DC–DC buck converter with a fully integrated power module is presented in this article. The converter is implemented using BiCMOS technology in amplifier and power MOSFET in a current sensor. The current sensor is realised by the power lateral double-diffused MOSFET with the aspect ratio much larger than that of a matched p-MOSFET. In addition, BiCMOS technology is applied in the error amplifier for an accurate current sensing and a fast transient response. The DC–DC converter is fabricated with 0.35?µm BiCMOS process. Experimental results show that the fully integrated converter operates at 1.3?MHz switching frequency with a supply voltage of 5?V. The output DC voltage is obtained as expected and the output ripple is controlled to be within 2% with a 30?µH off-chip inductor and 100?µF off-chip capacitor. 相似文献
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采用电流模、电压模双环控制结构,结合峰值电流采样等关键技术,实现了一款功率集成的单片DC/DC变换器。设计的峰值电流采样、斜率补偿大大提高了系统的稳定性,提高了系统的快速瞬态响应能力;针对高压低压差线性稳压器(LDO)、电流采样等高压模块电路,通过采样齐纳二极管、高压NJFET代替高压厚栅MOSFET等的设计方法,从总体上降低高压器件的数量,在基于30 V BCD(Bipolar-CMOS-DMOS)工艺上,结合特殊器件的版图设计方法,制作出一款输入电压5.5~17 V,电压调整率小于10 mV,电流调整率小于25 mV,输出电流大于5 A,系统静态电流小于25 mA,最高工作效率为93%的高效单片DC/DC,其抗总剂量能力大于100 krad(Si)。 相似文献
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Daolian Chen 《Industrial Electronics, IEEE Transactions on》2008,55(1):30-37
A novel circuit-topology family of the current-mode AC/AC converter with high-frequency AC link, based on a Flyback converter, is proposed. These circuit topologies, which can transfer one unregulated sinusoidal voltage with high total harmonic distortion (THD) into another regulated constant-frequency sinusoidal voltage with low THD, are composed of input cycloconverter, high-frequency storage transformer, and output cycloconverter. The circuit-topology family includes single four-quadrant power switch mode, push-pull mode, half-bridge mode, and full-bridge mode circuits. The single four-quadrant power switch mode and push-pull mode converters are suitable for low input voltage fields, but the half-bridge mode and full-bridge mode converters are suitable for high input voltage fields. The operational mode, steady principle, and transient voltage feedback control strategy of the kind of converter are investigated. The output characteristic curve, its relation to internal resistance, and the design criteria for the key circuit parameters are given. The theoretical analysis and the test result of the 500 VA 220 V 15% 50 HzAC/220 V 50 HzAC prototype have shown that the converters have advantages such as high-frequency galvanic isolation, simple topology, two-stage power conversion [low frequency alternating current (LFAC)/high frequency alternating current (HFAC)/LFAC], bidirectional power flow, high efficiency, high power density, low THD of the output voltage, strong adaptability to various loads, higher line power factor, low audio noise, etc. 相似文献
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《Industrial Electronics, IEEE Transactions on》2009,56(8):2970-2980