SINGLE PHASE FULL BRIDGE INVERTER FOR R LOAD USING MOSFET/IGBT
A stage that is solitary DC-AC inverter is shown in Figure. The analysis associated with period that is single inverters is completed considering following assumptions and conventions:
The entering that is present a inside Figure is known as to be good.
The switches S1, S2, S3 and S4 are unidirectional, i.e. they conduct current in one way.
When the switches S1 and S2 are turned on simultaneously for a duration 0 ≤ t ≤ T1 , the the input voltage Vin appears across the load and the current flows from point a to b.
Q1 - Q2 ON, Q3 - Q4 OFF ==> Î½ o = Vs
If the switches S3 and S4 turned on duration T1 ≤ t ≤ T2, the voltage across the load the load is reversed and the current through the load flows from point b to a.
Q1 - Q2 OFF, Q3 - Q4 ON ==> Î½ o = -Vs
The voltage and current waveforms across the resistive load are shown in Figure The instantaneous output voltage can be expressed in Fourier Series as
Due to square wave symmetry along the x-axis( as seen in Figure), both a o and an are Zero, and bn is obtained as
Substituting the value of bn from equation 12 into equation 11 gives the instantaneous output voltage
The instantaneous current through the resistive load is given by
The waveform of the output voltage and the switch currents for a resistive load is shown in Figure.