共查询到18条相似文献,搜索用时 140 毫秒
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新型混合DPWM方法及其实现 总被引:1,自引:0,他引:1
数字脉宽调制器(Digital Pulse Width Modulator,简称DPWM)是数字控制开关电源的核心.在DPWM的实现中,存在DPWM分辨率与系统工作频率之间的矛盾.提出了一种新型混合高分辨率DPWM方法,该方法利用现场可编程门阵列(Field Programmable Gate Array,简称FPGA)中数字时钟管理(Digtal Clock Manager,简称DCM)的倍频及移相功能、高频计数比较模块及数字"抖动"方法,在系统硬件工作频率为32MHz,开关频率为1 MHz的条件下,实现了11位的DPWM分辨率.论述了各模块的原理及实现方法,并给出了基于Virtex-Ⅱ FPGA的仿真和实验结果. 相似文献
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随着计算机绘图规模的需要,借助辅助硬件资源,来提高图形处理单元(GPU)处理速度的需求越来越普遍.结合计算机绘图及FPGA的特点,本文采用Top-Down的方法对GPU几何变换单元部分进行了FPGA设计实现.所有结构模块均实现了RTL级建模,并对其中较复杂的矩阵构造单元和矩阵乘法器模块给出了详细的描述.最后借助电子设计自动化工具(EDA)对整个模块进行了验证综合,结果表明,符合设计需求,该方案能很好地完成几何变换功能,资源耗费低,最高工作频率可达120 MHz. 相似文献
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采用完全可编程的数字电源控制器UCD3138作为数字电源的主控芯片.通过片内数字电源控制环路执行数字控制.此环路由1个专用误差模数转换器(EADC)、1个基于2极点2零点数字PIDα环路补偿器CLA和具有250 ps脉宽分辨率的数字脉宽调制器(DPWM)组成.EADC将输出电压的采样值转换为数字量,利用CLA的PIDα 控制律实现基准值与采样值之间的误差调节,通过片内DPWM发出PWM波,驱动数字电源主电路开关管工作,从而控制数字电源达到稳定输出.详细分析了数字环路控制基本原理和PIDα CLA设计方法,并基于Fusion Digital Power Designer软件对所设计的PIDα CLA进行仿真验证,最后使用C语言设计了相应的PIDα CLA,并在实验样机上基于PSM3750频率响应分析仪验证PIDα算法,实验验证了该数字电源PIDα CLA设计方法的正确性与可行性. 相似文献
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采用现场可编程门阵列(FPGA)实现了自动相机聚焦(AF)镜头模块位置控制电机伺服控制系统集成电路(IC)的全数字控制设计。镜头模块位置控制驱动电机由具有数字伺服驱动的音圈电机(VCM)担任,数字伺服驱动包括数字伺服控制器、数字电流控制器和全桥DC-DC转换器,系统能为高性能、轻质量和超薄型的移动式自动相机的AF镜头模块位置控制提供完整的数字控制方案,使相机的AF镜头模块控制范围在30 ms内可以达到0.6 mm,控制分辨率小于5μm,驱动力峰值为30 mN,输出电流峰值为120 mA。 相似文献
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K. Sri Gowri T. Brahmananda Reddy Ch. Sai Babu 《Electrical Engineering (Archiv fur Elektrotechnik)》2010,92(7-8):245-255
In recent years several discontinuous pulse width modulation (DPWM) methods are reported to improve the performance of AC drives at high modulation indices. It is proved that the performance of the popular PWM methods is modulation index dependent and no single DPWM method provides satisfactory performance over the entire high modulation range. Two popular existing DPWM methods renowned with the names DPWMMIN, DPWMMAX clamp each phase for 120° duration in every cycle of its fundamental voltage. It is observed that only the zero state is different in these two sequences. In this paper, it is proposed that, utilizing these two DPWM sequences and by changing the zero state at any spatial angle γ, where γ is between 0° and 60°, an infinite number of DPWM sequences including the existing DPWM methods and advanced DPWM (ADPWM) methods can be generated which are categorized as “continual clamping” and “split clamping” sequences. Using these ADPWM techniques an optimal split clamping sequence-based DTC of induction motor is proposed. With the proposed DTC method it is shown that steady state line current distortion at higher line side voltages is reduced significantly compared with the CDTC as well as conventional SVPWM (CSVPWM)-based DTC. 相似文献
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为了降低开关损耗,非连续脉宽调制(DPWM)方法被广泛应用于中点钳位型三电平逆变器(NPC-TLI),但是DPWM在中点电压的控制上表现了某些不足。为了减少NPC-TLI的开关损耗并同时控制中点电压,文中采用切换钳位模式来实现对中点电压的有效控制。为了避免在切换钳位模式时引入附加开关动作,提出了一种可实现钳位模式无缝切换的改进的脉宽序列的DPWM策略。通过仿真和实验,对所提策略、传统DPWM和现有优化DPWM算法进行了比较。理论分析和实验结果均表明,所提策略具有良好的中点电压控制能力以及开关损耗降低能力。 相似文献
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Limin Yu Shen Xu Huaxin Zhang Longxing Shi Weifeng Sun 《International Journal of Circuit Theory and Applications》2021,49(1):114-127
High‐resolution pulse width modulators are used widely in different fields of electrical engineering, such as dimming of light‐emitting diode (LED) lighting, motor control, RF modulators, audio amplifiers, and switch‐mode power supplies. To realize a high‐resolution digital pulse‐width modulator (DPWM) in a limited inner system clock, a simple implementation of a hybrid DPWM with the resolution under 50 ps based on a general‐purpose field‐programmable gate array (FPGA) is described. The multiplexer device implementing the fast carry‐chain path and an AND gate controlling the selection input are used as a delay unit. The manual routing or placement is not required in the proposed approach, which just needs some conditional constraints. Some different conditional constraints influencing the monotonicity and resolution of DPWM are discussed. Finally, a 1 MHz switching frequency DPWM with 40 ps resolution is experimentally demonstrated, with high monotonicity and linearity. Further, a synchronous buck with and without this high‐resolution DPWM is experimentally compared to illustrate the regulation resolution. 相似文献
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对于三电平中点钳位光伏逆变器,基于断续脉宽调制(discontinuous pulse width modulation, DPWM)并通过选择特定矢量进行钳位控制的方法,存在矢量分解计算时间长、注入共模电压分量和漏电流过大等不足。对此,提出了一种基于I-DPWM的三电平中点钳位光伏逆变器漏电流抑制方法。通过计算各类DPWM等效调制波来解析注入的低频共模电压分量。针对低频共模电压分量最小的DPWM1,在低频共模电压不连续点注入新的零序分量,通过减小低频共模电压来抑制漏电流幅值。同时,采用载波实现DPWM,免去了复杂的矢量运算。最后,在Matlab/Simulink平台建立了20 kW三电平中点钳位光伏逆变器的仿真模型,同时结合所设计的125 W实验样机验证了所提方法的有效性。 相似文献
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Xin Cheng Bin Li Haowen Zhu Yongqiang Zhang Zhang Zhang 《International Journal of Circuit Theory and Applications》2021,49(1):159-168
In this paper, a hybrid architecture of digital pulse width modulator (DPWM) which applies a counter, a phase‐shifted circuit, and a carry chain is proposed. Dual‐edge‐triggered flip‐flops are used in the phase‐shifted circuit to generate signals with 45° phase shift, which not only improves the resolution of the DPWM but also reduces the resource consumption in the carry chain. Furthermore, a hardware compensation method is used to solve the duty cycle increment phenomenon that affects the regulation accuracy of converter. An 11‐bit DPWM with the proposed architecture is implemented and tested by Xilinx Artix‐7 FPGA. The experimental results show a high resolution of 32 ps and a good linearity where R2 is 0.99 and verify the effect of duty cycle compensation. 相似文献
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数字控制高频变换器的新颖PWM方法 总被引:13,自引:7,他引:6
数字化PWM调制在高频应用中存在精度受限制的问题。该文提出一种新的PWM技术-双调制PWM,结合高频和低频的优势,解决了数字化PWM中高频与精度之间的矛盾,使数字化PWM可用于高频,高精度电能变换器之中,理论分析,仿真和实验结果均论证了这一方法的优越性。 相似文献