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Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
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For a full wave bridge inverter, the output voltage (Vo).
Vo=2Vs for 0<t<2T
Vo=Vs for 0<t<2T
Vo=Vs for 2T<t<T
Vo=−Vs for 2T<t<23T
Vo=Vs for 0<t<2T
In a single-phase full-bridge inverter, the output voltage waveform switches between +Vs and −Vs depending on which pair of switches is triggered. During the interval 0<t<T/2, the diagonal pair (typically S1 and S4) is turned on, connecting the source voltage Vs directly to the load.
In a single-phase full-bridge inverter, the output voltage waveform switches between +Vs and −Vs depending on which pair of switches is triggered. During the interval 0<t<T/2, the diagonal pair (typically S1 and S4) is turned on, connecting the source voltage Vs directly to the load.
Vo(rms)=Vs — The RMS output voltage for a square wave inverter
f=T1 — Relationship between frequency and switching period
The full-bridge inverter uses four controlled switches arranged in a bridge topology. By alternating the conduction of switch pairs (S1-S4 and S2-S3) with a period T, a square wave output is generated across the load. When S1 and S4 are gated, the load terminal sees +Vs; when S2 and S3 are gated, the load terminal sees −Vs. This ensures the load receives an alternating voltage despite being supplied by a DC source.
Full-bridge inverters provide twice the output voltage compared to half-bridge configurations for the same DC source.
The output voltage is a square wave with peak magnitude equal to the DC supply voltage Vs.
Requires four switches (IGBTs or MOSFETs) with corresponding anti-parallel diodes.
Higher output voltage capability
Better utilization of DC source
Higher switch count compared to half-bridge
Requires more complex gate drive circuitry
Uninterruptible Power Supplies (UPS)
Variable Frequency Drives (VFD)
Option A is incorrect because Vs/2 is the output of a half-bridge inverter.
Option D is incorrect because the period defined is for one half-cycle, not a phase-shifted representation.
B is correct — For a full-bridge inverter, the output voltage is equal to the DC source voltage Vs during the conduction interval of the first pair of switches (0<t<T/2).
Always remember that in bridge inverters, the full DC bus voltage is applied to the load, whereas in half-bridge, only half the bus voltage is available due to the capacitive center tap.