Digital Signal Processing in Power Electronics Control Circuits
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1 Krzysztof Sozaiiski Digital Signal Processing in Power Electronics Control Circuits Springer
2 Contents 1 Introduction Power Electronics Systems Digital Control Circuits for Power Electronics Systems Analog Versus Digital Control Circuit Causal and Noncausal Circuits LTI Discrete-Time Circuits Digital Filters Hard Real-Time Control Systems Sampling Rate Simultaneous Sampling Number of Bits Multirate Control Circuits Active Power Filters Digital Class D Power Amplifiers Symbols of Variables What is in This Book 18 References 19 2 Analog Signals Conditioning and Discretization Introduction Analog Input Galvanic Isolation Common Mode Voltage Isolation Amplifiers Current Measurements A Resistive Shunt Current Transformers Transformer with Hall Sensor Current Transformer with Magnetic Modulation Current Transducer with Air Coil Comparison of Current Sensing Techniques Total Harmonic Distortion Analog Signal Sampling Rate 41 xiii
3 xiv Contents 2.6 Signal Quantization Noise Shaping Technique Dither Signal Headroom Maximum Signal Frequency versus Signal Acquisition Time Errors in Multichannel System Amplitude and Phase Errors of Sequential Sampling A/D Conversion Synchronization of Sampling Process Sampling Clock Jitter Effective Number of Bits A/D Converters Suitable for Power Electronics Control Circuits A/D Converter with Successive Approximation A/D Converter with Delta Sigma Modulator Selected Simultaneous Sampling A/D Converters ADS AD ADS TMS320F Conclusions 70 References 70 3 Selected Methods of Signal Filtration and Separation and Their Implementation Introduction Digital Filters Digital Filter Specifications Finite Impulse Response Digital Filters Infinite Impulse Response Digital Filters Designing of Digital IIR Filters Lattice Wave Digital Filters Comparison of Classical IIR Filter and Lattice Wave Digital Filter Realization of LWDF Modified Lattice Wave Digital Filters First-Order Sections Second-Order Sections Linear-Phase IIR Filters Multirate Circuits Signal Interpolation Signal Decimation Multirate Circuits with Wave Digital Filters Interpolators with Linear-Phase IIR Filters 107
4 Contents xv 3.7 Digital Filter Banks Strictly Complementary Filter Bank DFT Filter Bank Sliding DFT Algorithm Sliding Goertzel Algorithm Moving DFT Algorithm Wave Digital Lattice Filter Bank Implementation of Digital Signal Processing Algorithms Basic Features of the DSP Digital Signal Processors: SHARC Family Digital Signal Controller: TMS320F28xx Family Digital Signal Processor: TMS320C6xxx Family Conclusions 140 References Selected Active Power Filter Control Algorithms Introduction Control Circuit of Shunt APFs Synchronization APF Control with First Harmonic Detector Control Circuit with Low-Pass 4-Order Butterworth Filter Control Circuit with Low-Pass 5-Order Butterworth LWDF Control Circuit with Sliding DFT Control Circuit with Sliding Goertzel Control Circuit with Moving DFT The p - q Theory Control Algorithm for Shunt APF Shunt APF Classical Control Circuit Dynamics of Shunt APF Methods of Reducing APF Dynamic Distortion APF Output Current Ripple Calculation Predictive Control Algorithm for APF Experimental Results Step Response of APF Selected Harmonics Separation Methods Suitable for APF Control Circuit with MDFT Control Circuit with IPT Algorithm Multirate APF Analog Input Circuit Output Inductors APF Simulation Results Conclusion 201 References 202
5 xvi Contents 5 Digital Signal Processing Circuits for Digital Class D Power Amplifiers Introduction Digital Class D Power Amplifier Circuits Modulators for Digital Class D Power Amplifiers Oversampled Pulse Width Modulator Basic Topologies of Control Circuits for Digital Class D Power Amplifiers Open Loop Amplifiers Amplifiers with Digital Feedback for Supply Voltage Amplifiers with Analog Feedback for Output Pulses Amplifiers with Digital Feedback Supply Units for Class D Power Amplifiers Click Modulation Interpolators for High Quality Audio Signals Single-Stage Interpolators Multistage Interpolators Class D Audio Power Amplifiers Digital Crossovers Loudspeaker Measurements Class D Power Amplifier with Digital Click Modulator Digital Crossovers Realization of Digital Click Modulator Experimental Results Digital Audio Class D Power Amplifier with TAS5508 DSP TAS K8EVM Three-way Digital Crossover Experimental Results Conclusions, 253 References Conclusion Summary of Results Future Work 261 References 262 Index 263
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