Lecture Notes # 7 - ELE847 WEEK 7(2 hours for midterm 1...

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ELE847 – WEEK 7 (2 hours for midterm, 1 hour lecture) Midterm Answers: Q1: J r K s s J r K V a a v a a a v a r τ τ τ ω 2 2 1 + + = o K 2 K 0 1 = K 3 K Q4: 1)1162rpm 2)13.3A 3)13.3A 4)6.8A 5)190V 4.2 – Single Phase Voltage Source Inverters (VSI) Voltage source inverters – input, dc fixed output, ac variable volta variable frequency (1) Single phase voltage source inverter Circuit Diagram 1 g 4 g 3 g 2 g 1 D 2 D 3 D 4 D dc V o V R Load a b GND 4 1 ~ T T - switching devices (IGBTs) 4 1 ~ D D - free wheeling diodes (discuss it later)
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(2) Waveforms (180° conduction angle) 2 1 , g g V V 4 3 , g g V V on T T 2 1 off T T 2 1 off T T 4 3 on T T 4 3 dc V dc V dc V dc V t t t t t a V b V b a ab o V V V V = = π π 2 WRT GND Note: and are the voltages at node a and b WRT GND a V b V Q: How to change inverter output frequency o f ? A: Change the frequency of gating signals Q: How to adjust inverter output voltage o V ?
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