Single-phase half-bridge inverter. Operational Details Consists of 2 choppers, 3-wire DC source Transistors switched on and off alternately Need to isolate.

Презентация:



Advertisements
Похожие презентации
Unit-3 RECTIFIERS, FILTERS AND REGULATORS :Half wave rectifier, ripple factor, full wave rectifier, Harmonic components in a rectifier circuit, Inductor.
Advertisements

Unit -6 AMPLIFIERS: Small signal low frequency transistor amplifier circuits: h- parameter representation of a transistor, Analysis of single stage transistor.
By Intersil Corporation. The ICL8038 waveform generator is a monolithic integrated circuit capable of producing high accuracy sine, square, triangular,
RLC circuit. An RLC circuit (or LCR circuit) is an electrical circuit consisting of a resistor, an inductor, and a capacitor, connected in series or in.
MEK-6400 series Technical seminar Sensors adjustment.
Unit-5 BIASING AND STABILISATION:BJT biasing, DC equivalent model, criteria for fixing operating point, methods of Bias stabilization, Stabilization factors,Compensation.
Unit-8 OSCILLATORS: Condition for oscillations. RC-phase oscillator with transistor and FET, Hartley and colpitts oscillators, Wien bridge oscillator,
Time-Series Analysis and Forecasting Lecture on the 5 th of October.
M ICROWAVE FET Microwave FET : operates in the microwave frequencies unipolar transistors – current flow is carried out by majority carriers alone Its.
Time-Series Analysis and Forecasting – Part IV To read at home.
1 Unit-7 FEEDBACK AMPLIFIERS: Concept of feedback, Classification of feedback amplifiers, General characteristics of negative feedback amplifiers, Effect.
Chap 8-1 Statistics for Business and Economics, 6e © 2007 Pearson Education, Inc. Chapter 8 Estimation: Single Population Statistics for Business and Economics.
Time-Series Analysis and Forecasting – Part V To read at home.
SJB (Smart Junction Box) Copyright 2009 All rights reserved. No part of this material may be reproduced, stored in any retrieval system or transmitted.
Sequences Sequences are patterns. Each pattern or number in a sequence is called a term. The number at the start is called the first term. The term-to-term.
Copyright by Hyundai Motor Company. All rights reserved. PTL (Power Trunk Lid System)
Copyright CCNA 1 Chapter 4, Part 1 Cable Testing By Your Name.
HPC Pipelining Parallelism is achieved by starting to execute one instruction before the previous one is finished. The simplest kind overlaps the execution.
1 Another useful model is autoregressive model. Frequently, we find that the values of a series of financial data at particular points in time are highly.
PAT312, Section 21, December 2006 S21-1 Copyright 2007 MSC.Software Corporation SECTION 21 GROUPS.
Транксрипт:

Single-phase half-bridge inverter

Operational Details Consists of 2 choppers, 3-wire DC source Transistors switched on and off alternately Need to isolate the gate signal for Q 1 (upper device) Each provides opposite polarity of V s /2 across the load 3-wire DC source

Q 1 on, Q 2 off, v o = V s /2 Peak Reverse Voltage of Q 2 = V s

Q 1 off, Q 2 on, v o = -V s /2

Waveforms with resistive load

Look at the output voltage rms value of the output voltage, V o

Fourier Series of the instantaneous output voltage

rms value of the fundamental component

When the load is highly inductive

Turn off Q 1 at t = T o /2 Current falls to 0 via D 2, L, V s /2 lower + V s /2 - + V s /2 -

Turn off Q 2 at t = T o Current falls to 0 via D 1, L, V s /2 upper + V s /2 - + V s /2 -

Load Current for a highly inductive load Transistors are only switched on for a quarter-cycle, or 90

Fourier Series of the output current for an RL load

Fundamental Output Power In most cases, the useful power

DC Supply Current If the inverter is lossless, average power absorbed by the load equals the average power supplied by the dc source. For an inductive load, the current is approximately sinusoidal and the fundamental component of the output voltage supplies the power to the load. Also, the dc supply voltage remains essentially at V s.

DC Supply Current (continued)

Performance Parameters Harmonic factor of the nth harmonic (HF n ) for n>1 V on = rms value of the nth harmonic component V 01 = rms value of the fundamental component

Performance Parameters (continued) Total Harmonic Distortion (THD) Measures the closeness in shape between a waveform and its fundamental component

Performance Parameters (continued) Distortion Factor (DF) Indicates the amount of HD that remains in a particular waveform after the harmonics have been subjected to second-order attenuation. for n>1

Performance Parameters (continued) Lowest order harmonic (LOH) The harmonic component whose frequency is closest to the fundamental, and its amplitude is greater than or equal to 3% of the amplitude of the fundamental component.

Single-phase full-bridge inverter

Operational Details Consists of 4 choppers and a 3-wire DC source Q 1 -Q 2 and Q 3 -Q 4 switched on and off alternately Need to isolate the gate signal for Q 1 and Q 3 (upper) Each pair provide opposite polarity of V s across the load

Q 1 -Q 2 on, Q 3 -Q 4 off, v o = V s + V s -

Q 3 -Q 4 on, Q 1 -Q 2 off, v o = -V s - V s +

When the load is highly inductive Turn Q 1 -Q 2 off – Q 3 -Q 4 off

Turn Q 3 -Q 4 off – Q 1 -Q 2 off

Load current for a highly inductive load

Example 6.3 – MultiSim7

Example 6.3 using the scope