ZVS QR - UTKweb.eecs.utk.edu/~dcostine/ECE581/Fall2014/lectures/L33_slides.pdf · ZCS ZVS....
Transcript of ZVS QR - UTKweb.eecs.utk.edu/~dcostine/ECE581/Fall2014/lectures/L33_slides.pdf · ZCS ZVS....
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Classification of Resonant‐Switch Converters
ZVS‐QR
Buck
Boost
Buck‐Boost
Cuk
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20.3.1 The zero‐voltage‐switchingquasi‐resonant switch cell
Lr
Cr
D2
SW
When the previously‐described operations are followed, then the converter reduces to
Lr
Cr
D2+–
L
C R
+
V
–
Vg
I
+
v2(t)
–
i1(t) i2(t)
+
v1(t)
–
+ vCr(t) –
iLr(t)D1
Q1
A full‐wave version based on the PWM buck converter:
ZVS‐QR
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ZVS‐QR State Plane Trajectory
The average output voltage
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Results:Quasi‐resonant switches
Output characteristics: Full‐wave ZVS buck
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20.3.2 The ZVS multiresonant switch
When the previously‐described operations are followed, then the converter reduces to
A half‐wave version based on the PWM buck converter:
Lr
Cs
D2
SW
Cd
Lr
D2+–
L
C R
+
V
–
Vg
I
+
v2(t)
–
i1(t) i2(t)
+
v1(t)
–
Cd
Cs
D1
Q1
ZVS QSW Converters: Already Studied
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Lecture 21
20.2.3 Quasi‐square‐wave resonant switches
Lr Cr
D2
SW
Lr Cr D2SW
When the previously‐described operations are followed, then the converter reduces to
ZCS
ZVS
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A quasi‐square‐wave ZCS buck with input filter
+–
Lr
Cr
Vg
Cf
Lf D1
D2
Q1 L
C R
+
V
–
I
• The basic ZCS QSW switch cell is restricted to 0 ≤ µ ≤ 0.5
• Peak transistor current is equal to peak transistor current of PWM cell
• Peak transistor voltage is increased
• Zero-current switching in all semiconductor devices