Page 289 - Rashid, Power Electronics Handbook

15 Resonant and Soft-Switching Converters 279

V
i
Q
1 C /2 V
r Leakage i
inductance Q C C Q
1 r r 3
L
I 1
Control I 1 L V
Circuit Tr D T 1 1 O
1 L
R D
1
T C 1
r
C O C
I O
V 2
o n:1 n:1
Q D2 Q Q D2
2 4 2
C C
C /2 r r
r
(a)
(a)
t t t t t t t t t
0 1 2 3 4 0 1 2 3
t t t t t t t t t
Q 0 1 2 3 4 0 1 2 3
1
Q ,Q
1 2
Q
2
Q ,Q
3 4
v
i v
V (Q ) i
DS 1
V ,V
Q1 Q2
0
0
v
i v
V (Q ) i
DS 2
V ,V
Q3 Q4
0
0
I /N
O I /N
O
I
Tr I
T1
0 0
-I /N -I /N
O O
I I
D1 D1
I V I V
O D1 O D1
-V
D1
0 0
I I
I V D2 I V D2
O D2 O D2
-V
D2
0 0
t t t t t t t t t t t t t t t t t t
0 1 2 3 4 0 1 2 3 0 1 2 3 4 0 1 2 3
t t t t t t t t t t
0 1 2 3 4 0 1 2 3 4
(b) (b)
FIGURE 15.11 Half-bridge converter with ZVS. (a) Circuit diagram; FIGURE 15.12 Full-bridge converter with ZVS. (a) Circuit schematic;
and (b) circuit waveforms. and (b) circuit waveforms.