A transmitter comprises a baseband processor, a wideband phase modulator and an amplitude modulated amplifier. A signal is provided through the baseband processor and is converted into polar coordinates, comprised of amplitude and phase components, with the amplitude component being transmitted to the amplitude modulated amplifier. The amplitude modulated amplifier being comprised of independently controllable current sources, and with the phase component being transmitted to the wideband phase modulator, for modulation upon a carrier wave, and subsequent transmission to the amplitude modulated amplifier for amplification according to control imposed by the amplitude component upon the current sources.

Electromagnetic wave transmitter systems, methods and articles of manufacture

This paper presents an application of an ALTERA FPGA Device, in the FLEX1OK family, producing pulse width modulation (PWM) signals with the vector modulation technique for an IGBT inverter. Using a single FPGA chip for the practical implementation of the modulator, rather than a system consisting of microprocessor and external memory, has many advantages including less use of power and space, short design time, greater speed and reliability. The designed circuit can generate PWM signals at many different frequencies, and also, the input values used to adjust output signal may be obtained through either a 4/spl times/4 keypad or microprocessor port.

FPGA based-IC design for inverter with vector modulation technique

This paper presents a novel idea to integrate three of the space vector modulation (SVM) schemes, including the alternating zero sequence, the symmetric sequence and the bus clamped scheme, in a single FPGA chip which provides many advantages. Flexibility, reliability and a very compact system are obviously obtained from this designed chip. Moreover, faster design and verification time, and design change without penalty are also benefits resulting from FPGA-based IC design. The optimized SVM schemes, frequencies and programmable deadtime that is used to adjust output signals are obtained through either 4/spl times/4 keypad or microprocessor port.

FPGA based-IC design for 3-phase PWM inverter with optimized space vector modulation schemes

Presents an application of a Xilinx FPGA device, in the CX4000 family, producing pulse width modulation (PWM) signals with the vector modulation technique for an IGBT inverter. Using a single FPGA chip for the practical implementation of the modulator, rather than a system consisting of microprocessor and external memory, has many advantages including less use of power and space, short design time, greater speed and reliability. The designed circuit can generate PWM signals, and also, the input values used to adjust output signal may be obtained through a microprocessor port. A comparison between the implementation on DSP and on FPGA at the level time will be made to validate the use of the FPGA.

FPGA-based IC design for inverter with vector modulation technique

Thispaper presents anideaofimplementingReconfigurable hardware suchFPGAisemployed inthis Space vector modulation (SVM)technique inprogrammable paper toachieve morereliability andspeed compared to hardware tocontrol bothsingle-phase andthree-phase software-control solutions. The systemdesign canbe induction motors. Instead ofatraditional useofSVM for changed without penalty resulting inshort design time. three-phase induction motors withfixed120-degree phase Although there aresomepapers (6)(7)(8) that useFPGA, difference, thephase angles ofpulse width modulation (PWM) basedonourknowledge, noneofthemproduces phase- signals introduced inthis paper canbedigitally varied, with variable PWIMsignals using vector modulation technique. onedegree resolution, from00-3600. Thisdesign isthereforeThesystem inthis paper isdesigned insuchawaythat the applicable forvarious single-phase motors. We implement the phaseangle ofPWM signals canbevaried -rather fixed to wholedesign inaXilinx Spartan IIchip, andtestina real condition. Theresults showthatusing afield programmable120°s resulting inusability forboththree-phase andsingle- gatearray (FPGA), instead ofmicrocontrollers, offers greaterphaseinduction motors. Input parameters suchasswitching speed andreliability, time, deadtime, modulation index, andphaseangle areall digitally controlled byusers. Thedesign canbeimplemented inacheap programmable hardware chip (Xilinx XC2S100) withnoperipheral memoryneeded. Thismakesthecontrol I. INTRODUCTION system verycompact andeasy touse. AC induction motors arethemostcommonmotors used Thepaperisorganized asfollows. Thenextsection inindustrial motion control systems, aswellasinmain explains drive topologies forallinduction motors. The poweredhome appliances, e.g.waterpumps,air-principle ofvector modulation technique isthendescribed in conditioning compressors. Regardiag thedcfferent section III. Section IVexplains eachdesign block inthe characteristics ofthese motors, speed andtorque controls of system. Thesimulation andreal implementing results are AC induction motorsrequire a proper control method. A illustrated insection V.Section VIconcludes thepaper. universal control solution fordifferent types ofthemotorsis themaininterest inthis paper.

Unified MotorController BasedonSpace Vector Modulation Technique

This work presents the design of a three-phase inverter with insulated gate bipolar transistors (IGBTs). The pulse width modulation technique based on the space vector theory is analysed in detail. The modulation strategy considers the calculation of the on-times of the different voltage vectors that must be applied to the load, to generate the voltage vector required by the speed control system of the machine. These times are calculated previously and stored in a ROM, producing a simple, reliable, compact and low cost digital modulator. The inverter behaves as a voltage source with variable amplitude and frequency. By using the space vector theory, the number of commutations in the inverter is minimized, reaching a reduction in the switching frequency and in the current distortion. >

M. Sepulveda

Papers

IGBT inverter with vector modulation