Digital Signal Processing

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n.madhavi Architecture Requirements for DSP

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Introduction Signal is defined as any physical quantity that varies with independent variables. For Example, the functions System , is defined as a physical device that performs an operation on a signal. Digital Signal Processing Signals, Systems and Signal Processing

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Basic elements of a digital signal processing system: A/D Converter Digital Signal Processing D/A Converter Analog input signal Analog output signal Digital input signal Digital output signal

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What is DSP ? Digital Signal Processing (DSP) is used in a wide variety of applications, and it is hard to find a good definition that is general. changing or analyzing information which is measured as discrete sequences of numbers TMS320C25 DSP

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TMS320C25 DSP Architectural overview Harvard architecture On-chip memory ALU Multiplier Memory interface Serial ports Multiprocessing applications Direct Memory Access

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On-line ups Any one application of DSP

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Role of UPS in daily life: As an auxiliary power source in case of line outage, particularly useful to sensitive loads. Maintains quality of the power supply,i.e,eliminates harmonics. Supplies power according to the load demand. Among various UPS topologies, on-line UPS provides maximum protection to the loads against any utility power problem.

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TYPICAL ON-LINE UPS Block diagram: POWER SOURCE STATIC BY -PASS RECTIFIER INVERTER CRITICAL LOAD BATTERY BANK FILTER INVERTER BATTERY BANK

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PULSE WIDTH MODULATION Need for PWM: To control inverter switching. To realize desired output waveform. To minimize the harmonic content in the output wave. Mechanism of PWM:

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Different PWM techniques Analog PWM circuits. Using Micro-processors. With Digital Signal Processor chips.

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Significance of using DSPs: Sophisticated switching algorithm. Flexibility in configuration. No analog circuitry. Chance for up gradation.

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DSP control of UPS systems. Basic block diagram: surge filter rectifier User interface Software communication inverter battery o/p filter DSP controller

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Flow chart for voltage control: start if V=S V=output rms voltage S= set value error=0 Non zero error To PWM inverter To PI compensator stop To PWM inverter Yes No

Basic elements of a digital signal processing system: :

Internal architecture of DSP controller: 50 Hz sine wave r.m.s Voltage compensator PWM inv . filter A/D Real harmonic detector Imaginary harmonic detector PI compensator PI compensator 5 th harm rms voltage 5 th harm . rms set value

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Merits of using DSP: Software controllable. Remote monitoring. Network management. High execution speed (30 MIPS). Algorithm for DSP processors is generally written in any language like C, C++ etc.

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DSPs vs. Microprocessors 1.Per cycle access: 1-8 instructions 1-4 instructions 2. Software compatibility: Can be linked with MATLAB Can be linked with GUI 3. Performance: Compound instructions RISC instructions perform perform multiple single operation. Operations. eg:multiply+load+modifies eg: add ,load or store. the address register. 4. SIMD: Limited SIMD features. No SIMD support. 5.Real time DSP chips used 5.Microprocessors used are are TMC62X, Blackfin etc P4,powerpc etc

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Advantages of using DSP in UPSs: High Reliability. Low dimensions. Precision. Interactive communication. Compact and sleek form factor.

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Closing thoughts: To include more intelligent systems in it’s architecture. Cutting the cost by making its use extensive. Increasing the efficiency of electronic components.

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R EFERENCES 1.“DSP control of high-power feeding non-linear loads” by Annette Von Jouanne & Prasad N.Enjeti ,from IEEE transactions on IE,vol 43,no.1,Feb 1996. 2.“Digital Signal Processor based online UPS” manual by www.cranessoftware.com 3.“Power electronics Analysis design & applications” by Ned Mohan, Tore M.Undeland,William.P.Robbins 4.“Interfacing DSPs with high performance analog converters” Jim Ryan 5.WEMPEC-25 th anniversary review meeting ,R&D innovation center Eaton Corp. 6. “2004 Bores Signal Processing : web pages.. 7.Kenton Wilson, Berekely design technology Inc, Calif..USA.

PULSE WIDTH MODULATION:

Questions ????

Different PWM techniques:

THANK YOU!!

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