DC to DC Converters - Power Electronic -Module 3

• • Lesson 17 Types of Basic DC-DC Converters, objectives: Three basic types of dc-dc converter circuits - buck, boost and buck-boost ~ The expressions for the output voltage in the above circuits, with inductive (R-L) and battery (or back emf = E) load. contents: [ DC-DC Converters ~ Buck Converters (dc-dc) ~ Boost Converters (dc-dc) ~ Buck-Boost Converters (dc-dc) ~ Control Strategies ~ Time-ratio Control ~ Constant Frequency Operation ~ Variable Frequency Operation ~ Current Limit Control ]
  • Lesson 18 Analysis of Buck Converter (DC-DC) Circuit, objectives: Derivation of the expressions for the maximum and minimum load currents ~ Calculation of the following: the duty ratio for the limit for continuous conduction, the average value and the ripple factor of the load current, the harmonic components of the output voltage waveform. contents: [ Buck Converter (DC-DC) ~ Maximum and Minimum Values of the Load Current ~ The Duty Ratio (k) for the Limit of Continuous Conduction ~ The Average Value of the Output Current ~ Fourier Analysis of the Output Voltage Waveform ]
  • Lesson 19 Commutation of Thyristor-Based Circuits Part-I, objectives: Requirements to be satisfied for the successful turn-off of a SCR ~ The turn-off groups as per the General Electric classification ~ The operation of the turn-off circuits ~ Design of a SCR commutation circuit. contents: [ Classification of forced commutation methods ~ Class A, Self commutated by resonating the load ~ Class B, Self commutated by an L-C circuit ~ Class C, C or L-C switched by another load-carrying SCR ~ Class D, L-C or C switched by an auxiliary SCR ~ Class E - External pulse source for commutation ~ Class F, AC line commutated ~ Rate of rise of forward voltage, dv/dt ]
  • Lesson 20 Commutation of Thyristor-Based Circuits Part-II, objectives: Practical significance of commutation ~ Limitations of line commutation ~ Ability to determine commutation interval ~ Insight to different methods of commutation ~ Consequences of the commutating methods on device stresses. contents: [ Commutation in PAC ~ Input voltage waveform distortion ~ Three-phase converters ~ Commutation in DC-DC Choppers ~ Practice Problems with Answers and Questions ]
  • Lesson 21 Introduction to Switched-Mode Power Supply (SMPS) Circuits, objectives: Identify the basic elements in a regulated power supply ~ Explain the basic principle of operation of linear and switched mode power supplies ~ Compare the merits and demerits of SMPS vis-à-vis linear power supplies ~ Interpret Power supply specifications. contents: [ Introduction to regulated dc power supplies ~ Linear regulated power supply ~ Switched Mode Power Supply (SMPS) ~ SMPS versus linear power supply ~ Hybrid (SMPS followed by linear) power supply ~ Multiple output SMPS ~ Resonant Mode Power Supplies ]
  • Lesson 22 Fly-Back Type Switched Mode Power Supply, objectives: Identify the topology of a fly-back type switched mode power supply circuit. ~ Explain the principle of operation of fly-back SMPS circuit. ~ Calculate the ratings of devices and components used in fly-back converter for the specified input and output voltages and for the required output power. ~ Design a simple fly-back converter circuit.. contents: [ Basic Topology of Fly-Back Converter ~ Circuit Equations Under Continuous-Flux Operation ~ Circuit Equations Under Discontinuous-Flux Mode ~ Continuous Versus Discontinuous Flux Mode of Operation ~ A Practical Fly-Back Converter ]
  • Lesson 23 Forward Type Switched Mode Power Supply, objectives: Identify the topology of a forward type switched mode power supply circuit. ~ Explain the principle of operation of a forward dc-to-dc power supply. ~ Calculate the ratings of devices, components, transformer turns ratio for the given input and output voltages and the required output power. ~ Design a simple forward type switched mode power supply circuit.. contents: [ Practical Topology of A Forward Converter Circuit ~ Selection of Transformer Turns Ratio ~ Selection of Filter Circuit Inductor and Capacitor ]
  • Lesson 24 C uK and Sepic Converter, objectives: Compare the advantages and disadvantages of ??CuKand Sepic converters with those of three basic converters. ~ Draw the circuit diagrams and identify the operating modes of ??CuKand Sepic converters. ~ Draw the waveforms of the circuit variables associated with ??CuKand Sepic converters. ~ Calculate the capacitor voltage ripples and inductor current ripples in ??CuKconverter.. contents: [ Analysis of C uK converter ~ Expression for average output voltage and inductor currents ~ Current ripple and voltage ripple calculations ~ The SEPIC Converter ]
  • Lesson 25 Design of Transformer for Switched Mode Power Supply (SMPS) Circuits, objectives: Explain the underlying principles behind the design of a high frequency transformer and inductor. ~ Do a preliminary design of a high frequency transformer for some popular configurations of SMPS circuits. ~ Do a preliminary design of a high frequency inductor. ~ Estimate the size of an SMPS transformer of some given VA rating.. contents: [ Recapitulation of Governing Equations for Utility Transformer ~ Derivation of Design Equations for SMPS Transformer ~ Transformer with Square-Wave Voltage and Bipolar Flux ~ Transformer with Unipolar Flux ~ Design of Inductor-Transformer ~ Transformer Winding ]
  
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