Series Resonant Inverter with Bidirectional Switch ECE 442
Series Resonant Inverter with Bidirectional Switch ECE 442 Power Electronics 1
Turn Q 1 ON at t = 0 A “resonant” pulse of current flows, charging C to VC 1, Q 1 turns OFF ECE 442 Power Electronics 2
C charges to VC 1, Q 1 turns OFF ECE 442 Power Electronics 3
C discharges via D 1 and Vs • For t > t 1 – The capacitor acts as a voltage source – Current io reverses, and flows via D 1 to VS ECE 442 Power Electronics 4
“Idealized Version” ECE 442 Power Electronics 5
ECE 442 Power Electronics 6
Half-Bridge Series Resonant Inverter ECE 442 Power Electronics 7
Turn Q 1 ON, Resonant Pulse of current appears. ECE 442 Power Electronics 8
Turn Q 2 ON, Resonant Pulse of current appears in the opposite direction, and goes to zero. ECE 442 Power Electronics 9
Waveform Summary ECE 442 Power Electronics 10
Overlapping and Non-Overlapping modes • Non-Overlapping Mode – Firing of the switching device is delayed until the last current oscillation through the diode is completed ECE 442 Power Electronics 11
Overlapping and Non-Overlapping modes • Overlapping Mode – Firing of the switching device occurs before the last current oscillation through the diode is completed. – This increases the output frequency and the output power ECE 442 Power Electronics 12
Multi. Simulation ECE 442 Power Electronics 13
Non-Overlapping Mode ECE 442 Power Electronics 14
Overlapping Mode ECE 442 Power Electronics 15
Full-Bridge Series Resonant Inverter ECE 442 Power Electronics 16
Frequency Response of Series-Resonant Inverters ECE 442 Power Electronics 17
Series-Loaded Inverter • Load Resistor in series with L and C ECE 442 Power Electronics 18
ECE 442 Power Electronics 19
ECE 442 Power Electronics 20
Frequency Response ECE 442 Power Electronics 21
Parallel-Loaded Case ECE 442 Power Electronics 22
ECE 442 Power Electronics 23
ECE 442 Power Electronics 24
Frequency Response ECE 442 Power Electronics 25
Series-Parallel Loaded Case ECE 442 Power Electronics 26
Frequency Response ECE 442 Power Electronics 27
- Slides: 27