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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Transactions of the Korean Institute of Power Electronics
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Journal DOI :
The Korean Institute of Power Electronics
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Volume & Issues
Volume 10, Issue 6 - Dec 2005
Volume 10, Issue 5 - Oct 2005
Volume 10, Issue 4 - Aug 2005
Volume 10, Issue 3 - Jun 2005
Volume 10, Issue 2 - Apr 2005
Volume 10, Issue 1 - Feb 2005
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PLL Control Method for Precise Speed Control of Slotless PM Brushless DC Motor Using 2 Hall-ICs
Yoon Y.H ; Lee S.J ; Kim Y.R ; Won C.Y ; Choe Y.Y ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 2, 2005, Pages 109~116
The high performance drives of the slotless Permanent Magnet Brushless DC(PM BLDC) motor can be achieved by the current control, where the currents flow according to the rotor position and the current phase is suitably controlled according to the operational condition. Rotor position information can be provided by Hall-IC or sensorless algorithm. So, the Hall-ICs are set up in this motor to detect the main flux from the rotor. Instead of using three Hall-ICs and encoder, this paper uses only two Hall-ICs for the permanent magnet rotor position and the speed feedback signals, and uses a micro-controller of 16-bit type (80C196KC). Also because of low resolution obtained by using Hall-IC even low-cost and simple structure, to improve the wide range of speed response characteristic more exactly, we propose the rotor position signal synthesizer using PLL circuit based on two Hall-ICs.
LC Filter Design Considering Voltage Control Performance and PWM Inverter Size for Dynamic Voltage Restorers
Kim Hyosung ; Kim Jang-Hwan ; Sul Seung-Ki ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 2, 2005, Pages 117~123
The cutoff frequency of a LC output filter for Dynamic Voltage Restorers (DVR) limits the control bandwidth of a DVR system while it attenuates the inverter switching ripples. For a selected cutoff frequency of a LC output filter, infinite number of L-C combinations is possible. Although different L-C combination has different filter characteristics, the filter design on L-C combination has been depended on field experiences without clear analysis. This paper proposes a design criterion and design examples for the L-C filter combination considering the control characteristics and the size of DVRs. An experimental DVR system based on the proposed LC output filter design methodology is built and tested.
Advanced Method for an Initial Pole Position Estimation of a PMLSM
Lee Jin-Woo ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 2, 2005, Pages 124~129
This paper presents an advanced method for an initial pole position estimation of a Permanent Magnet Linear Synchronous Motor(PMLSM) that has an accurate incremental encoder for servo applications but does not have Hall sensors as a magnetic pole sensor. By appropriately using the secant method as a numerical method the proposed algorithm finds either of two zero force positions and then the correct d-axis by applying a q-axis test current. It only requires the tuned current controller and the relative position information md so it can be simply applicable to a rotary PMSM. The experimental results show the validity of the proposed method, which has an excellent performance with respect to an accurate pole position estimation under the minimal moving distance(average of about 85㎛) during the estimation process.
Design of Inverter for Driving the Multi-lamp using an Piezoelectric Transformers
Cho Sung-Koo ; Lim Young-Cheol ; Yang Seung-Hak ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 2, 2005, Pages 130~137
LCD needs a backlight that is a light source as a photodetector that has a light modulation function and CCFL is used usually. Inverter that composes using existent winding transformer operates multi lamps, however, this efficiency falls by losses of core or winding and volume or weight increases or there is danger of fire by overheating. In order to solve these problems, a multi lamp driving Inverter using PT is composed according to the design guideline in this paper. We conformed whether the multi lamp drive method using EEFL that a current burden is less in applicable to piezoelectric inverter, and used the method that connect two piezoelectric transformers by parallel to an inverter.
A Development of an Industrial SPMSM Servo Drive System using TMS320F2812 DSP
Kim Min-Heui ; Lim Tae-Hoon ; Jeong Jang-Sik ; Kim Seong-Ho ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 2, 2005, Pages 138~147
This paper presents a SPMSM(Surface-mounted Permanent Magnet Synchronous Motor) servo drive system using high performance TMS320F2812 DSP for the industrial application. The DSP(Digital Signal Processor) Controller enables an enhanced real time algorithm and cost-effective design intelligent for only exclusively motor drives which can be yield enhanced operation, fewer system components, lower control system cost, increased efficiency and high performance. The suggested system contain speed and current sensing circuits, SVPWM(Space Vector Pulse Width Modulation) and I/O interface circuit. The developed servo drive control system showns a good response characteristics results and high performance features in general purposed 400[w] machine. This system can achieve cost reduction and size minimization of controllers.
A Low Cost Position Sensing Method of Switched Reluctance Motor Using Reflective Type Optical-sensors
Kim S.J. ; Yoon Y.H. ; Won C.Y. ; Kim H.S. ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 2, 2005, Pages 148~154
As the exciting point of each phase is determined by the position of rotor, the rotor's accurate position-information is needed for the Switched Reluctance Motor(SRM). When using an absolute-encoder or a resolver, to detect the location of rotor the initial starting is possible, as early sensing of rotor's location is possible. However, this is not appropriate, considering the economical efficiency, and in case of using the incremental-encoder, there's a problem at initial starting as it is not easy to track down the location of rotor at the very beginning. When using Hall-ICs, there's a fault, as it needs a special ring magnet. Considering the initial starting and economical efficiency, the optical sensor technique using a slotted-disk and an opto-interrupter is appropriate, however, this method needs three opto-interrupters and a slotted-disk when using the 6/4 pole SRM. Nevertheless, in this paper, it used only two optical sensors to operate 6/4 pole SRM and made the start up and also forward and reverse operation possible. By excluding the slotted-disc md shortening a optical sensor, it improved the convenience and economical efficiency of the production. Also, as the space for slotted-disc is no more needed, it was able to reduce the size of motor.
Time Constant Estimation of Induction Motor rotor using MRAS Fuzzy Control
Lee Jung-Chul ; Lee Hong-Gyun ; Chung Dong-Hwa ; Cha Young-Doo ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 2, 2005, Pages 155~161
This paper presents time a constant estimation of induction motor using MRAS(model reference adaptive system) fuzzy control. The rotor time constant is enabled from the estimation of rotor flux, which has two methods. One is to estimate it based on the stator current and the other is to integrate motor terminal voltage. If the parameters are correct, these two methods must yield the same results. But, for the case where the rotor time constant is over or under estimated, the two rotor nut estimation have different angles. Furthermore their angular positions are related to the polarity of rotor time constant estimation error. Based on these observation, this paper develops a rotor time constant update algorithm using fuzzy control. This paper shows the theoretical analysis as well as the simulation results to verify the effectiveness of the new method.
Design of Digital Current Mode Control for Power Converters
Jung Young-Seok ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 2, 2005, Pages 162~168
In this paper, a digital current mode control is designed for the power converter applications. The designed digital current mode controller is derived analytically from the continuous time small signal model of the power converters. Due to the small signal model based derivations of the control law, the designed control method can be applicable to boost, buck, and buck-boost converters. It is also proven that the controlled power converter employing the designed digital current mode controller is always stable regardless of an operating conditions. In order to show the usefulness of a designed controller, experiments are carried out using a 16bit DSP micro-processor, TMS320LF2406A.
Modeling and Analysis of Active-Clamp, Full-Bridge Boost Converter
Kim Marn-Go ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 2, 2005, Pages 169~176
In this paper, a DC and small-signal AC modeling for the active-clamp, ful1-bridge boost converter is described. Based on the operation principle, the ac part of the converter can be replaced by a dc counterpart. Then, a conceptual equivalent circuit is derived by rearranging the switches. The equivalent circuit for this converter consists of CCM(Continuous conduction mode) boost and DCM(Discontinuous conduction mode) buck converter. The analyses for the equivalent CCM boost and DCM buck converter are done using the model of PWM switch. The theoretical modeling results are confirmed through experiment or SIMPLIS simulation.
A New High Efficiency DC/DC Converter with Wide ZVS Range for PDP Sustain Power Module
Park Ki-Bum ; Kim Chong-Eun ; Moon Gun-Woo ; Youn Myung-Joong ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 2, 2005, Pages 177~185
A new high efficiency DC/DC converter is proposed, which is derived from the conventional asymmetric half-bridge converter. Because the proposed converter has better ZVS condition compared with the conventional asymmetric half-bridge converter, it shows a high efficiency along the wide load range. In this paper, the basic operations of the proposed converter is analyzed and compared with that of the conventional half-bridge converter, and the excellent performance of the proposed converter is verified by the experimental results with the 425W, 385-170Vdc prototype of the power supply for PDP (Plasma Display Panel) Sustain Driver of PDP TV.
High Speed Operation of Spindle Motor in the Field Weakening Region
Yu J-S ; Park S-H ; Yoon J-M ; Shin S-C ; Won C-Y ; Choi C ; Lee S-H ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 2, 2005, Pages 186~193
This paper presents a strategy to drive built in-type spindle induction motor which is used as CNC(Computer Numerical Control) in the industry. Gopinath model flux estimator which is composed of current model to be profitable in the low speed range and voltage model to be profitable in the high speed range is used for rotor flux estimation. Moreover this paper presents to drive the spindle motor in the high speed range by using the flux weakening control. High speed operation of spindle motor in the field weakening region is verified through simulations and experiments.
A Study on the NPC Type Multi-Level Energy Recovery Sustaining Driver for AC Plasma Display Panel
Yoo Jong-Gul ; Hong Soon-Chan ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 2, 2005, Pages 194~202
This paper proposes a new multi-level energy recovery sustaining driver for AC PDP(Plasma Display Panel), which solves the problems and maintains the merits of the conventional multi-level sustaining driver. While the conventional circuit improves the hard switching in the Weber circuit, there exist parasitic resonant currents in resonant inductors and Vs/2 sustaining period. Comparing the proposed circuit with the conventional circuit, the number of inductors are reduced by half, the parasitic resonant currents in resonant inductors are eliminated, and the hard switching problem is solved by CIM(Current Injection Method). Moreover the voltages across series-connected switching elements in the full bridge circuit are distributed equally by adopting NPC(Neutral Point Clamping) techniques. And circuit operations of the proposed circuit are analyzed for each mode and the validity is verified by the simulations using PSpice program and experimentation with a prototype drive circuit.
A Study on the Development of Hybrid Micro Power Sources for the IMT2000
Kim il-Song ; Youn Myung-Joong ; Kim Jung-Han ; Ju Hun ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 2, 2005, Pages 203~210
A study on the hybrid micro power source for the IMT2000 application has been presented. The hybrid micro power source is composed of solar cell, super-capacitor and battery. To compensate for the pulse loader of the IMT2000 application, the super-capacitor is connected through the lithium-lon battery to absorb the pulse discharge current. The solar cell provides the additional current to compensate for the depleted current and it is controlled to operate at the maximum power point voltage. A novel maximum power point tracking method is presented to operate at the pulse discharge load conditions and verified to have superior tracking performance through experiment. The controller design for the hybrid micro power source has been presented and verified through experiment.