Papers by Keyword: Digital Control

Abstract: — this paper presents a digital current controller for H-bridge pulse width modulation (PWM) converters, whose sampling frequency equals quadruple of the switching frequency,. This current regulator detects the ac current and manipulates the voltage reference not only at the upper and lower peaks of the PWM triangle carrier but also at its zero crossings. A modified deadbeat current regulator is proposed to suppress the current oscillation induced by the voltage error, based on the theoretical analysis. Experimental results are shown to verify the control performance of the proposed current regulator. Moreover, a proposed current regulator is applied to a single-phase active power filter to demonstrate the effectiveness in harmonic compensation. Index Terms—Current regulators, digital control, DSPs, pulsewidth modulation (PWM), shunt active filters.

Abstract: The system can detect the speed of DC motor,based on the collected information of speed, the singlechip control the PWM signal generating circuit, and the PWM wave adjustable is produced, thus the steering and speed of the DC motor is controlled.The digital control mode has the advantages of high integration, high reliability and low noise.

Abstract: The purpose of this study is to develop the architectural system design of the Six Channels Compact Fuzzy Logic Controller (SCC-FLC) ready to be embedded into the FPGA (Field Programmable Gate Array) for joints of arm robot's manipulator. The FPGA based system design of this study could controlled independently six servo of arm robot manipulators to reduce workload of computer system. The method of this study divided into four steps. The first step, the FLC-P (Fuzzy Logic Controller Processor) block module of single channel C-FLC (Compact Fuzzy Logic Controller) on the previous study is redesigned in architectural system design by adding lots of block modules using multiplexing method. The second step, the module interconnections of system architecture are designed by defining some of inputs and output ports. The third step, the specific function of block modules about working processes is determined based on the definition of input and output ports. The fourth step, sequences of multiplexing processes are determined based on the algorithm of FLC, thus the total processing time of SCC-FLC could be estimated from architectural system design. Architectural system design of SCC-FLC requires external chips are 12bit ADC MAX-186 chip and 12bit DAC MAX-3203 of six chips. The block modules of SCC-FLC are FLC-P, LUT-MBFs (Look Up Table of Membership Function), ADC-I (Analog to Digital Converter Interface), DAC-I (Digital Analog Converter Interface), ECEG (Error and Change Error Generators), SPL (Set Point Latchs) and TAC (Time And Control). The total processing time of SCC-FLC by estimation is 256.2 µS or sampling frequency of 3.907KHz using clock frequency of 100MHz.

Abstract: Generating complex forms with the computer has become easier however a challenge still lies in the realization of these forms. Realize the digital fabrication face two challenges: first, how to evaluate the assembly ability of the design; second, how to realize digital fabrication combine with the Traditional technology. This paper introduces that the assembly ability evaluation ideas on design by the method of the combination of System Dynamics and association graph, and it needs to pay attention to the value added chain process fusion with the traditional mode of production in the process of evaluation.

Abstract: This research is about the system architecture for embedding of the Compact Fuzzy Logic Controller (Compact-FLC) into the FPGA with a minimal need in device resource. This exciting research is to minimize the FPGA resources needed to build Compact-FLC based on FPGA for controlling each joint of arm robots manipulator. Compact-FLC results of this research have been used in the XILINX Spartan 3 XC3S1000 FPGA.The Compact-FLC has been applied with satisfactory results as Servo Controller for one joint of arm robot manipulator which the results showed that the controller achieved a process speed of 65,4uS, which is equivalent to a maximum sampling frequency of 15.290 KHz. Output membership function in this Compact-FLC used singleton membership function with Center Of Area algorithm. Two input membership functions, i.e E (Error) and CE (Change Error) have been used, both formed from several combination of triangular membership functions. The maximum number of fuzzysets that can be processed is sixteen. The overlapping function is not limited because there have been 256 if-then rule available as look up table in FPGA's ROM.The device utilization summary from ISE of XILINX development software gave the following data: Slice FlipFlops needed are 3869 or 25% of 15360 availability, 4 input LUT needed are 2319 or 15% of 15360 availability, Blocks of RAM needed are 4 or 16% of 24 availability, MULT18x18s needed are 2 or 8% of 24 availability, GCLKs needed are 2 or 25% of 8 availability, Bonded IOBs needed are 32 or 18% of 173 availability.

Abstract: A PRE control scheme in single-phase inverter is adopted, namely connecting the proportional component with repetitive controller in parallel. This control scheme not only retains the characteristics of fast dynamic response from proportion link ,but also absorbs the advantages of no steady-state error in repetitive control .When the system is in stable operation condition, repetitive controller is used to resist periodic disturbance and thus improve the steady-state performance. Contrarily, the proportional component can feel mutation of input error and produce accommodation immediately to ensure the systems fast speed of response .The comprehensive theoretical analysis of this control strategy is given, and the system is designed in Matlab based on this theory, besides, the control scheme is achieved in the DSP platform by using digital control algorithm. Simulation and experimental results prove that the proposed scheme can achieve good dynamic and steady-state performance.

Abstract: The three-level converter based on A-NPC topology can improve waveform quality of the output voltage, decrease the switch voltage and reduce the loss of the inductor, thus it has broad application prospects in the electrical power storage domain. This paper built the semi-physical real-time simulation platform of A-NPC three-level battery power storage system by designing the control system and the main circuit of the A-NPC topology converter, and researched the control mechanism of the power storage converter control algorithm with digital simulation platform. The experimental results of the prototype machine show that the A-NPC three-level battery power storage system built in this paper was fine, compared with the most common two-level topology, three-level converter has characteristics of lower output current waveform distortion factor, lower current harmonics and higher efficiency. Three-level converter used in the power storage system is able to gain access to low THD during steady-state operation and fine dynamic characteristics.

Abstract: This paper introduces a design process of a Bi-directional DC-DC converter. The main circuit uses a single-ended forward converter circuit, ARM as controller. The adoption of the synchronous rectify technique and full digital control make the whole system possess the advantages of compact structure, high conversion efficiency, easy control, reliable work and realize the energy conversion in bi-directional freely. We can verify the feasibility of the program through prototype testing.

Abstract: The inverter power supply system has strong nonlinearity and parameter variability, especially in the non-linear loads, conventional control technology is difficult to achieve effective control and get the ideal control effect. Aiming at the control requirements of single-phase high-frequency induction heating inverter supply power control applications, uses a novel multiple and composite control technologies to achieve rapid power modulation control of inverter. The components and design principles of proposed control system were introduced in detail. The inverter power system model based on the new control strategy has been built, and inverter prototype used for high-frequency induction heating was designed. The experimental results show that the proposed control method to obtain better dynamic characteristics than the conventional control technologies, and has good advantages of system steady-state accuracy, robustness and control qualities, which has wide range of application.

Abstract: With the wide application of electronic device and network, plenty of data is added to multimedia database. In this paper, our work will expand application area and improve mining efficiency based on the improved data mining algorithm. A better humanization of evaluation (mining) process and results is obtained with the help of D-M strategy. The technique, which is concluded from plenty of data, is mainly divided into 3 steps: data arrangement, regulation searching and regulation presentation. This method reduces the affection of human factors on each evaluation links and saves the human task of management. It makes great sense to the theory research and algorithm improvement by applying digital manipulation to improvement of intelligent teaching-management data analysis evaluation and management tactics.