GATE EE 2014 Set 3 — Question 65
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Power Electronics → Inverters → VSI (1φ, 3φ)
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Question
A single-phase voltage source inverter shown in figure is feeding power to a load. The triggering pulses of the devices are also shown in the figure. 
If the load current is sinusoidal and is zero at , the node voltage has the waveform
Correct answer
(D) [figure]
Solution
In a single-phase full-bridge voltage source inverter, the pole voltage (node A measured from the DC-link midpoint O) depends only on leg A, i.e. on / (top) and / (bottom).Gated intervals
is never zero. It switches between at , , , and , which is the waveform in option (D).Answer: (D)
- is gated from to , so A is tied to the positive rail and .
- is gated from to , so A is tied to the negative rail and .
- For , (out of node A). The only path is up through from the negative rail, so .
- For , (into node A). The current flows through to the positive rail, so .
| Interval | Conducting | |
|---|---|---|
| to | ||
| to | ||
| to | ||
| to | ||
| to | ||
| to |
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