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Unit 4 inverters (part-1)
An inverter is a static device that converts DC power from a source like batteries into AC power at a desired output voltage and frequency. There are different types of inverters classified by their commutation method, component connections, and the nature of the DC source. Voltage source inverters have a constant voltage input and output voltage does not depend on the load, while current source inverters have a constant current input and output voltage depends on the load. Common inverter configurations include single phase half and full bridge inverters, and three phase inverters that can operate in 180 or 120 degree modes.
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Introduction to the presentation on Inverters by Mr. A. Johny Renoald.
Definition of an inverter as a device converting DC to AC power, with applications in various fields.
Inverters classified based on commutation, connections, and nature of DC source feeding.
VSI features: constant input voltage, output voltage independent of load, and output current dependent on load type.
CSI characteristics: constant input current, output current independent of load, and output voltage depends on load.
Subcategories of VSI: single phase, half bridge, full bridge, and three phase variants.
Focus on the design and characteristics of a Single Phase Half Bridge Inverter.
Details regarding the configuration and operation of a Single Phase Full Bridge Inverter.
Exploration of the Three Phase VSI operating in the 180-degree mode.
Conducting steps for three-phase VSI involving switching devices in different combinations.
Calculation of phase and line voltages for Step I of the inverter operation.
Voltage calculations for Step II, similar structure to Step I.
Detailed phase and line voltage calculations for Step III of the inverter operation.
Overview of the Three Phase VSI operating in the 120-degree mode.
Phase and line voltage calculations for Step I in 120-degree mode.
Voltage calculations for Step II in 120-degree mode. Similar to Step I.
Detailed calculations for Step III, presenting phase and line voltages for the inverter.
Summary of line voltage outputs for the discussed inverter configurations.
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Unit 4 inverters (part-1)
- 1. Inverters Presented by, Mr. A.Johny Renoald, M.E., Ph.D
- 2. What is anInverter? • A static device that converts DC power into AC power at desired output voltage and frequency is called an Inverter. • Applications – Adjustable – speed AC drives, – Induction Heating, – Aircraft power supplies, – UPS etc….
- 3. Classification of Inverters •According to the method of Commutation – Line Commutated Inverter – Force Commutated Inverter • According to the method of Connections –Series Inverter –Parallel Inverter –Bridge Type Inverter • According to the nature of DC source feeding the Inverter – Voltage source Inverter – Current Source Inverter
- 4. Voltage Source Inverters •VSI has a constant voltage at its input terminals. • Its output voltage does not depend on load. • Its output current depends on the type of load.
- 5. Current Source Inverters •CSI has a constant current at its input terminals. • Its output current does not depend on load. • Its output voltage depends on the type of load.
- 6. Voltage Source Inverters •Single phase Inverter • Half Bridge Inverter • Full Bridge Inverter • Three phase voltage source inverter • 180 degree mode • 120 degree mode
- 7. Single Phase HalfBridge Inverter
- 9. Single Phase FullBridge Inverter
- 11. Three Phase VSI(180 Degree Mode)
- 12. Step Devices Conducting IT1, T5 & T6 II T1, T2 & T6 III T1, T2 & T3 IV T4, T2 & T3 V T4, T5 & T3 VI T4, T5 & T6
- 13. • Step I 𝑽𝑹𝑵= 𝑽𝒀𝑵 = 𝑽𝑩𝑵
- 14. • Ste p II 𝑽𝑹𝑵= 𝑽𝒀𝑵 = 𝑽𝑩𝑵 =
- 15. Step Phase Voltage LineVoltage VRN VYN VBN VRY VYB VBR I Vs/3 -2Vs/3 Vs/3 Vs - Vs 0 II 2Vs/3 -Vs/3 -Vs/3 Vs 0 - Vs III Vs/3 Vs/3 - 2Vs/ 3 0 Vs - Vs IV -Vs/3 2Vs/3 -Vs/3 - Vs Vs 0 V -2Vs/3 Vs/3 Vs/3 - Vs 0 Vs VI -Vs/3 -Vs/3 2Vs/ 0 - Vs Vs
- 18. Three Phase VSI(120 Degree Mode)
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- 21. Step Phase Voltage LineVoltage VRN VYN VBN VRY VYB VBR I Vs/2 -Vs/2 0 Vs - Vs/ 2 - Vs/ 2 II Vs/2 0 -Vs/2 Vs/2 Vs/ 2 - Vs III 0 Vs/2 -Vs/2 - Vs/2 Vs - Vs/ 2 IV -Vs/2 Vs/2 0 - Vs Vs/ 2 Vs/ 2
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