Feedback Amplifiers
General Feedback Structure • Properties of negative feedback • Basic feedback Topologies • Feedback Amplifiers • Series-Shunt,Shunt-shunt,Series-Series,Shunt-series Feedback • Determining the Loop Gain • Stability Problem • Nyquist plot Effect of Feedback on amplifier poles –Frequency Compensation
Khushboo Gupta
MOSFET Gate Drive Circuit
Description............................................................................................................................................1 Table of Contents.................................................................................................................................2 1. Driving a MOSFET ...........................................................................................................................3 1.1. Gate drive vs. base drive.................................................................................................................... 3 1.2. MOSFET characteristics ...................................................................................................................... 3 1.2.1. Gate charge ...........................................................................................................................................4 1.2.2. Calculating MOSFET gate charge .......................................................................................................4 1.2.3. Gate charging mechanism...................................................................................................................5 1.3. Gate drive power ................................................................................................................................. 6 2. Example of a MOSFET gate drive circuit ......................................................................................8 2.1. Basic drive circuit................................................................................................................................. 8 2.2. Logic drive............................................................................................................................................. 8 2.3. Drive voltage conversion.................................................................................................................... 9 2.4. High-side drive from a half or full bridge ...................................................................................... 10 2.4.1. Using a high-voltage device and a bootstrap circuit (e.g., high-voltage IC) ............................10 2.4.2. Pulse transformer drive (insulated switching) ...............................................................................10 2.4.3. Using a photocoupler and a floating power supply.......................................................................11 3. Power supply for the MOSFET drive circuit................................................................................12 3.1. Transformer-isolated power supply................................................................................................ 12 3.2. Bootstrap circuit................................................................................................................................. 12 3.3. Charge pump...................................................................................................................................... 13 4. Considerations for the MOSFET drive circuit....................................................................................14 4.1. Considerations for the gate voltage VGS conditions............................................................................. 14 4.2. Gate voltage, peak current and drive loss .................................................................................... 15 4.3. Gate resistors and switching characteristics................................................................................. 15 4.4. Considerations for gate drive .......................................................................................................... 17 4.4.1. Protection against gate-emitter surge voltage ..............................................................................17 4.4.2. Optimal gate resistor..........................................................................................................................17 4.4.3. Gate malfunction prevention ............................................................................................................18 RESTRICTIONS ON PRODUCT USE..........
Three Phase Induction Motor
A. PREPARATION 1. Introduction 2. The Rotating Field 3. Rotor Currents 4. Induction Motor Equivalent Circuit 5. Torque and Power Characteristics 6. Operation Beyond the Range 0 < s < 1 7. Determination of Motor Constants 8. Bibliography B. EXPERIMENT 1 . Equipment List 2. Speed and Direction of Rotation 3. Starting Current 4. No Load Test 5. Locked Rotor Test C. REPORT
Single Phase Induction Motor
1)Introduction 2)Types of Single phase motor 3)Single phase induction motors a)advantages and disadvantages b)construction c)working 4)Double Revolving Field Theory 5)Equivalent Circuit 6)Starting Methods of Single Phase Induction Motor
Synchronous Motors
synchronous motors hysteresis motors synmogen
Special Electric Motors
1)Introduction 2)Submersible electric motors 3)Permanent magnet motors 4)Direct current motors 5)High-speed electric motors 6)Brake motors 7)Oil cooled electric motors 8)Water cooled electric motors 9)Naval motors
Some more special motors
Brushless DC Motors Switched Reluctance
DC Machines
DC machines 1)Definition 2)Generator with a load 3)Generator Field excitation 4)Classification of Generators DC Motors
Control structures in C
1)Conditional Constructs switch statement 2)Iterative Contructs while and do-while statements break and continue
Transformers
*state the purpose of a transformer. • explain the principle of mutual induction. · • determine the output voltage of a transformer if the input voltage and turns ratio are known. • determine the full-load current of a transformer given the kVA and voltages of the primary and secondary windings. • identify the common types of transformers from their schematic diagrams. • read transformer winding diagrams and connect a transformer for the desired primary and secondary voltage. • choose the proper transformer taps to obtain the desired output voltage. • connect buck and boost transformers to obtain desired voltage for a single-phase application. • choose the correct transformer kVA for the application, given the voltage, current, and phase requirement of a load. • size overcurrent protection for dry-type transformers operating at 600 V or less. • size the feeder conductor for the transformer and wires from the transformer to loads. • properly ground a transformer, and the secondary electrical system produced by the transformer.
IoT Security Techniques Based on Machine Learning
IoT Security Techniques Based on Machine Learning Introduction IoT attack model Learning-based authentication Learning-based access control Secure IoT offloading with learning Learning-based IoT malware detection Conclusions and future work Acknowledgment Authors References
Array
Array 1)A Compound Data Type 2)Passing Arrays to Functions 3)Arrays,Pointers,Pointer Arithmetic 4)String Assignment And I/O 5)Array Initializers 6)Array for Databases 7)Common Errors 8)Summary 9)Exercises 10)Problems