1800 conduction mode of 3 phase inverter

Manikandan.S M.Tech Power System

180° Conduction

• Three transistors ON at a time

Summary Table

Waveforms for 180° Conduction

Phase Voltages for 180° Conduction

Waveforms for 180° Conduction

Summary Table

Mode 1 Operation

Mode 1 Operation

1

1

1

3

2 22

3

2 32

3

eq

s s

eq

san cn

sbn

R RR R

V Vi

R R

Vi Rv v

Vv i R

= + =

= =

= = =

−= − =

03

tπω≤ ≤

Q1, Q5, Q6 conduct

Summary Table

Mode 2 Operation

Mode 2 Operation

2

2

2

3

2 22

3

2

3

2 3

eq

s s

eq

san

sbn cn

R RR R

V Vi

R R

Vv i R

Vi Rv v

= + =

= =

= =

−−= = =

2

3 3t

π πω≤ ≤

Q1, Q2, Q6 conduct

Summary Table

Mode 3 Operation

Mode 3 Operation

2

3t

π ω π≤ ≤

3

3

3

3

2 22

3

22

3

eq

s s

eq

an bn

scn

R RR R

V Vi

R R

iv v

Vv i R

= + =

= =

= =

−= =Q1, Q2, Q3 conduct

Phase Voltages for 180° Conduction