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Gunma University, Japan
2015/11/4Yoshiki Sunaga, N.Shiraishi, K.Asaishi, N.Tsukiji, Y.Kobori, N.Takai, H. Kobayashi
TakaiLaboratory
High Efficiency Single-Inductor Dual-Output DC-DC Converter with ZVS-PWM Control
1
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GUNMA UNIVERSITY TAKAI-LAB
OUTLINE
Background and Objective
Boost Converter with ZVS-PWM Control
Simulation results
Conclusion and Future works
2
Implementation of SISO Boost Converter with ZVS-PWM Control
Conventional SIDO Boost Converter
![Page 3: High Efficiency Single-Inductor Dual-Output DC-DC Converter with … · 2015. 11. 24. · Proposal! ZVS is one of the soft-switching methods for switching loss reduction (ZVS:Zero](https://reader033.vdocuments.net/reader033/viewer/2022052616/60a6e1a8343e8466195641d6/html5/thumbnails/3.jpg)
GUNMA UNIVERSITY TAKAI-LAB 3
OUTLINE
Background and Objective
Boost Converter with ZVS-PWM Control
Simulation results
Conclusion and Future works
Implementation of SISO Boost Converter with ZVS-PWM Control
Conventional SIDO Boost Converter
![Page 4: High Efficiency Single-Inductor Dual-Output DC-DC Converter with … · 2015. 11. 24. · Proposal! ZVS is one of the soft-switching methods for switching loss reduction (ZVS:Zero](https://reader033.vdocuments.net/reader033/viewer/2022052616/60a6e1a8343e8466195641d6/html5/thumbnails/4.jpg)
GUNMA UNIVERSITY TAKAI-LAB 4
Social demandminiaturization
low cost weight reduction
high efficiency
Background and Objective
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GUNMA UNIVERSITY TAKAI-LAB 5
SIDO means… Single Inductor Dual Output
Dual Output and
Single Inductorminiaturization
Background and Objective
SIDO boost converter power stage
Co1 R1
Co2
L
SW0
D
SW2
SW1
R2
Vin
Vo1
Vo2
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GUNMA UNIVERSITY TAKAI-LAB 6
Proposal!ZVS is one of the soft-switching
methods for switching loss reduction (ZVS:Zero Voltage Switching)
high efficiency
Background and Objective
SIDO boost converter power stage
apply
Co1 R1
Co2
L
SW0
D
SW2
SW1
R2
Vin
Vo1
Vo2
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GUNMA UNIVERSITY TAKAI-LAB
OUTLINE
7
Background and Objective
Boost Converter with ZVS-PWM Control
Simulation results
Conclusion and Future works
Implementation of SISO Boost Converter with ZVS-PWM Control
Conventional SIDO Boost Converter
![Page 8: High Efficiency Single-Inductor Dual-Output DC-DC Converter with … · 2015. 11. 24. · Proposal! ZVS is one of the soft-switching methods for switching loss reduction (ZVS:Zero](https://reader033.vdocuments.net/reader033/viewer/2022052616/60a6e1a8343e8466195641d6/html5/thumbnails/8.jpg)
GUNMA UNIVERSITY TAKAI-LAB
Switching loss
8
Switching loss
when the switch is turned ON/OFF, The switch transistor suffers from an electrical loss.
Psw =
Z �t
0I(t) · V (t)dt
=1
6· V · I ·�t
Its expression is given as follows:
switch OFF > switch ON
0
IV
t2t1
OFF ON OFF
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GUNMA UNIVERSITY TAKAI-LAB
ZVS(Zero Voltage Switching)
9
ZVS mean... Switching method for the switching loss reduction. Use the resonance between the inductor and the capacitor.
Vsw=GND Switch ON & OFF! Psw reduction
0
IV
t2t1
OFF ON OFF
Vsw gradually raises by resonance between
the inductor and the capacitor.
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GUNMA UNIVERSITY TAKAI-LAB
Power Stage
10
SISO Boost Converter with ZVS-PWM Control
SISO Boost ConverterSISO Boost Converter
with ZVS-PWM Control
RoCo
D
M
L
CinVin
Vsw
PWM
RoCoCr
D
M
L
CinVin
Vsw
PWM
SISO:Single Inductor Single Output
Vo Vo
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GUNMA UNIVERSITY TAKAI-LAB
11
RoCo
D
M
L
CinVin
Vsw
PWM
RoCoCr
D
M
L
CinVin
Vsw
PWM
Power Stage
SISO Boost ConverterSISO Boost Converter
with ZVS-PWM Control
Only add the resonance capacitor Cr!
SISO Boost Converter with ZVS-PWM Control
Vo Vo
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GUNMA UNIVERSITY TAKAI-LAB 12
ZVS-PWM SISO Boost Converter Power stage
simulation result of SISO Boost Converter with ZVS-PWM control in steady-state. Its operation can distribute in 4 states.
0IL
PWM
Vsw
t0 t1 t2 t4t3
0
Vo
Vin Cin
L
M1
D
Cr
Co Ro
PWM
Vsw
SISO Boost Converter with ZVS-PWM Control
Vo
Vf
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GUNMA UNIVERSITY TAKAI-LAB
Vo
VfVin Cin
L
M1
D
Cr
Co Ro
PWM
Vsw
13
PWM:Hi M1:ON D:OFF
Terminal voltage Vsw=0V. IL is increased at the rate of Vin/L. Cr is charged to Vo during this period.
State1
State1
0IL
PWM
Vsw
t0 t1 t2 t4t3
0
Vo
0IL
PWM
Vsw
t0 t1 t2 t4t3
0
Vo
0IL
PWM
Vsw
t0 t1 t2 t4t3
0
Vo
0IL
PWM
Vsw
t0 t1 t2 t4t3
0
Vo
IL
SISO Boost Converter with ZVS-PWM Control
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GUNMA UNIVERSITY TAKAI-LAB
VfVin Cin
L
M1
D
Cr
Co Ro
PWM
Vsw
14
IL is supplied to output by Cr. Vsw drastically increases due to current supply to Cr. Finally, Vsw increases to Vo+Vf until diode is turned ON.
State2
0IL
PWM
Vsw
t0 t1 t2 t4t3
0
Vo
0IL
PWM
Vsw
t0 t1 t2 t4t3
0
Vo
0IL
PWM
Vsw
t0 t1 t2 t4t3
0
Vo
0IL
PWM
Vsw
t0 t1 t2 t4t3
0
Vo
IL
State2 PWM:Lo M1:OFF D:OFF
SISO Boost Converter with ZVS-PWM Control
Vo
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GUNMA UNIVERSITY TAKAI-LAB
Vin Cin
L
M1
D
Cr
Co Ro
PWM
Vsw
15
Vsw is Vo+Vf, Diode is turned ON, and resonance stops. IL flows through diode from Vin. IL decreases at the rate of (Vin-Vo)/L. Finally, IL is turned to the opposite direction flow at t3. In this period, Vsw maintains to Vo+Vf.
State3
0IL
PWM
Vsw
t0 t1 t2 t4t3
0
Vo
0IL
PWM
Vsw
t0 t1 t2 t4t3
0
Vo
0IL
PWM
Vsw
t0 t1 t2 t4t3
0
Vo
0IL
PWM
Vsw
t0 t1 t2 t4t3
0
Vo
State3 PWM:Lo M1:OFF D:ON
SISO Boost Converter with ZVS-PWM Control
Vf
Vo
IL
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GUNMA UNIVERSITY TAKAI-LAB
Vin Cin
L
M1
D
Cr
Co Ro
PWM
Vsw
16
IL is negative, Diode is turned OFF, and resonance starts again. Vsw gradually decreases due to IL supply. When Vsw reaches at 0V, then M1 is turned ON and state returns to State1.
State4
0IL
PWM
Vsw
t0 t1 t2 t4t3
0
Vo
0IL
PWM
Vsw
t0 t1 t2 t4t3
0
Vo
0IL
PWM
Vsw
t0 t1 t2 t4t3
0
Vo
0IL
PWM
Vsw
t0 t1 t2 t4t3
0
Vo
State4 PWM:Lo M1:OFF D:OFF
SISO Boost Converter with ZVS-PWM Control
Vf
Vo
IL
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GUNMA UNIVERSITY TAKAI-LAB 17
The input and output voltage condition
The minimum of Vsw(t) ≦ 0V
�Vo
+ 2Vin
0V
Vo
� 2Vin
State4
The ZVS condition
Vin Cin
L
M1
D
Cr
Co Ro
PWM
Vsw Vo
IL
Vsw
(t) = Vo
· coswt+ Vin
(1� coswt)
IL
(t) = (Vin
� Vo
) ·r
Cr
L· sinwt
General solution
cosωt=-1(w :
1pCr · L
)
Vf
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GUNMA UNIVERSITY TAKAI-LAB 18
State4
The input and output voltage condition
Vin Cin
L
M1
D
Cr
Co Ro
PWM
Vsw Vo
IL
The minimum of Vsw(t) ≦ 0V
�Vo
+ 2Vin
0V
Vo
� 2Vin
Vsw
(t) = Vo
· coswt+ Vin
(1� coswt)
IL
(t) = (Vin
� Vo
) ·r
Cr
L· sinwt
(w :1p
Cr · L)
General solution The ZVS condition
cosωt=-1
The input and output voltage condition!
Vf
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GUNMA UNIVERSITY TAKAI-LAB
OUTLINE
19
Background and Objective
Boost Converter with ZVS-PWM Control
Simulation results
Conclusion and Future works
Implementation of SISO Boost Converter with ZVS-PWM Control
Conventional SIDO Boost Converter
![Page 20: High Efficiency Single-Inductor Dual-Output DC-DC Converter with … · 2015. 11. 24. · Proposal! ZVS is one of the soft-switching methods for switching loss reduction (ZVS:Zero](https://reader033.vdocuments.net/reader033/viewer/2022052616/60a6e1a8343e8466195641d6/html5/thumbnails/20.jpg)
GUNMA UNIVERSITY TAKAI-LAB 20
Timing Chart
SEL signal is Hi, and Output1 selected. PWM signal is Hi. Vo1 is decreased during this period.
ΔVo1>ΔVo2
OFF
t0~t1
Vo1
Vo2
PWM
SEL
SEL
to t1
t2
t3
t4
ON
<
+
<
+
SEL
SEL
SEL
Comp1
Comp2
power stage converter1
converter2
SEL Comp
Vo1
Vo2
PWM
Vo1
Vo2D Q
Q
SEL
SEL
pulse
<
+
<
+
<
+
Vref1
Vref2
Error amp1
Error amp2
Vin
Vsw
Conventional SIDO Boost ConverterSIDO Boost Converter
Vo1
Vo2
select 1
PWM:Hi
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GUNMA UNIVERSITY TAKAI-LAB
21
SEL signal is Hi, and Output1 selected. PWM signal is Lo. Vo1 is increase during this period. ΔVo1<ΔVo2 at t2, then SEL signal is turned Lo.
t1~t2
Vo1
Vo2
PWM
SEL
SEL
to t1
t2
t3
t4
<
+
<
+
SEL
SEL
SEL
Comp1
Comp2
power stage converter1
converter2
SEL Comp
Vo1
Vo2
PWM
Vo1
Vo2D Q
Q
SEL
SEL
pulse
<
+
<
+
<
+
Vref1
Vref2
Error amp1
Error amp2
Vin
Vsw
PWM:LoOFF
ON
select 1
Timing Chart
Conventional SIDO Boost ConverterSIDO Boost Converter
ΔVo1>ΔVo2
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GUNMA UNIVERSITY TAKAI-LAB 22
ON
t2~t3
OFF
Vo1
Vo2
PWM
SEL
SEL
to t1
t2
t3
t4
SEL signal is Lo, and Output2 selected. PWM signal is Hi. Vo2 is decreased during this period.
Timing Chart
Conventional SIDO Boost ConverterSIDO Boost Converter
select2
PWM:Hi
ΔVo1<ΔVo2
<
+
<
+
SEL
SEL
SEL
Comp1
Comp2
power stage converter1
converter2
SEL Comp
Vo1
Vo2
PWM
Vo1
Vo2D Q
Q
SEL
SEL
pulse
<
+
<
+
<
+
Vref1
Vref2
Error amp1
Error amp2
Vin
Vsw
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GUNMA UNIVERSITY TAKAI-LAB
23
SEL signal is Lo, and Output2 selected. PWM signal is Lo, Vo2 is increase during this period. ΔVo1>ΔVo2 at t4, then SEL signal is turned Lo.
t3~t4
ON
OFF
Vo1
Vo2
PWM
SEL
SEL
to t1
t2
t3
t4
<
+
<
+
SEL
SEL
SEL
Comp1
Comp2
power stage converter1
converter2
SEL Comp
Vo1
Vo2
PWM
Vo1
Vo2D Q
Q
SEL
SEL
pulse
<
+
<
+
<
+
Vref1
Vref2
Error amp1
Error amp2
Vin
Vsw
Conventional SIDO Boost ConverterSIDO Boost Converter Timing Chart
select2ΔVo1<ΔVo2
PWM:Lo
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GUNMA UNIVERSITY TAKAI-LAB
OUTLINE
24
Background and Objective
Boost Converter with ZVS-PWM Control
Simulation results
Conclusion and Future works
Implementation of SISO Boost Converter with ZVS-PWM Control
Conventional SIDO Boost Converter
![Page 25: High Efficiency Single-Inductor Dual-Output DC-DC Converter with … · 2015. 11. 24. · Proposal! ZVS is one of the soft-switching methods for switching loss reduction (ZVS:Zero](https://reader033.vdocuments.net/reader033/viewer/2022052616/60a6e1a8343e8466195641d6/html5/thumbnails/25.jpg)
GUNMA UNIVERSITY TAKAI-LAB
Simulation Circuit (SIDO)
25
V L C C C R R V V
2.5V 3.9uH 100nF 470uF 50Ω 6V 5V
Simulation Parameter
SIDO boost converter with ZVS-PWM control
<
+
<
+
SEL
SEL
SEL
Comp1
Comp2
SEL Comp
Vo1
Vo2
PWM
Vo1
Vo2D Q
Q
SEL
SEL
<
+
<
+
<
+
Vref1
Vref2
Error amp1
Error amp2
Vin
L D
Cr
M1 Co1 Ro1
Ro2Co2
Vsw
<
+
Vsw
ZVS Comp
Vo1
Vo2
![Page 26: High Efficiency Single-Inductor Dual-Output DC-DC Converter with … · 2015. 11. 24. · Proposal! ZVS is one of the soft-switching methods for switching loss reduction (ZVS:Zero](https://reader033.vdocuments.net/reader033/viewer/2022052616/60a6e1a8343e8466195641d6/html5/thumbnails/26.jpg)
GUNMA UNIVERSITY TAKAI-LAB 26
・the output voltage ripples of Vo1 and Vo2 are under 10mVp-p
output waveforms
Simulation Circuit (SIDO)
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GUNMA UNIVERSITY TAKAI-LAB 27
Simulation Circuit (SIDO)
Operation waveforms of SIDO boost converter with ZVS-PWM control
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GUNMA UNIVERSITY TAKAI-LAB 28
Simulation Circuit (SIDO)
Vo1 select Vo2 select
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GUNMA UNIVERSITY TAKAI-LAB 29
・PWM signal is turned Hi when Vsw=0V. ・SEL signal is switched when Vsw=0V.
Zero Voltage Switching!
Simulation Circuit (SIDO)
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GUNMA UNIVERSITY TAKAI-LAB 30
V 2.5V
V 6.03V
V 5.10V
L 6.8uH
C 100nF
C 940uF
R 51Ω
Implement Parameter
Operation waveforms of the SIDO boost converter with ZVS-PWM control
38mVp-p
35mVp-p
Impriment Circuit (SIDO)
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GUNMA UNIVERSITY TAKAI-LAB 31
Comparison of Switching Loss (SISO)
Simulation Circuit
SISO Boost Converter SISO Boost Converter with ZVS
V L C C R V F
2.5V 3.9uH-
470uF 20Ω 6V 170.3kHz100nF
Fop:Switching Frequency
<
+
Vin
L
M1
D
Cr
RoCo
<
+<
+
Vsw
Vsw
R
S
Q
PWMComp
Error amp
Vref
sawtooth
VoVin
L
M1
DRoCo
<
+<
+
Vsw
R
S
Q
PWMComp
Error amp
Vref
sawtooth
Vo
pulce
Simulation Parameter
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Propose
Comparison of Switching Loss
Switching time
Power lossPsw=10.3mW/sec
Psw=2.26mW/secPower loss
32
Conventional
Switching loss Psw
Psw =1
6· V · I ·�t
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Propose
Comparison of Switching Loss
Switching time
Power lossPsw=10.3mW/sec
Psw=2.26mW/secPower loss
33
Conventional
Switching loss Psw
Psw =1
6· V · I ·�t
ZVS can reduce
78% switching loss!
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GUNMA UNIVERSITY TAKAI-LAB
OUTLINE
34
Background and Objective
Boost Converter with ZVS-PWM Control
Simulation results
Conclusion and Future works
Implementation of SISO Boost Converter with ZVS-PWM Control
Conventional SIDO Boost Converter
![Page 35: High Efficiency Single-Inductor Dual-Output DC-DC Converter with … · 2015. 11. 24. · Proposal! ZVS is one of the soft-switching methods for switching loss reduction (ZVS:Zero](https://reader033.vdocuments.net/reader033/viewer/2022052616/60a6e1a8343e8466195641d6/html5/thumbnails/35.jpg)
GUNMA UNIVERSITY TAKAI-LAB
Operation principle
35
Measured waveforms of the SISO boost converter with ZVS-PWM control
V 2.5V
V 6V
L 3.9uH
C 100nF
C 470uF
R 51Ω
F 129kHz2us/div
Vo
IL
Vsw
PWM
Implement Parameter
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GUNMA UNIVERSITY TAKAI-LAB
Operation principle
36
Measured waveforms of the SISO boost converter with ZVS-PWM control
2us/div
Vo
IL
Vsw
PWM
0IL
PWM
Vsw
t0 t1 t2 t4t3
0
Vo
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GUNMA UNIVERSITY TAKAI-LAB 37
Switching time
Comparison of Switching Loss
Power lossPsw=102.2mW/sec
Psw=16.1mW/secPower loss
Switching loss Psw
Psw =1
6· V · I ·�t
Propose
Conventional
![Page 38: High Efficiency Single-Inductor Dual-Output DC-DC Converter with … · 2015. 11. 24. · Proposal! ZVS is one of the soft-switching methods for switching loss reduction (ZVS:Zero](https://reader033.vdocuments.net/reader033/viewer/2022052616/60a6e1a8343e8466195641d6/html5/thumbnails/38.jpg)
GUNMA UNIVERSITY TAKAI-LAB 38
Switching time
Comparison of Switching Loss
Power lossPsw=102.2mW/sec
Psw=16.1mW/secPower loss
Switching loss Psw
Psw =1
6· V · I ·�t
Propose
Conventional
ZVS can reduce
84.2% switching loss!
![Page 39: High Efficiency Single-Inductor Dual-Output DC-DC Converter with … · 2015. 11. 24. · Proposal! ZVS is one of the soft-switching methods for switching loss reduction (ZVS:Zero](https://reader033.vdocuments.net/reader033/viewer/2022052616/60a6e1a8343e8466195641d6/html5/thumbnails/39.jpg)
GUNMA UNIVERSITY TAKAI-LAB
OUTLINE
39
Background and Objective
Boost Converter with ZVS-PWM Control
Simulation results
Summary and Future works
Implementation of SISO Boost Converter with ZVS-PWM Control
Conventional SIDO Boost Converter
![Page 40: High Efficiency Single-Inductor Dual-Output DC-DC Converter with … · 2015. 11. 24. · Proposal! ZVS is one of the soft-switching methods for switching loss reduction (ZVS:Zero](https://reader033.vdocuments.net/reader033/viewer/2022052616/60a6e1a8343e8466195641d6/html5/thumbnails/40.jpg)
GUNMA UNIVERSITY TAKAI-LAB
Summary and Future works
40
Summary
• We have proposed a SIDO boost converter with ZVS-PWM control
for small size and high efficiency.
• We have shown condition of Zero Voltage Switching(Vo≧2Vin).
• ZVS can reduce 78% of switching loss on simulation(SISO).
• ZVS can reduce 84.2% of switching loss on implementation(SISO).
Future works
• We implement SIDO boost converter with ZVS-PWM control.
• The measurement of characteristics of ZVS-PWM control(SISO,SIDO).
![Page 41: High Efficiency Single-Inductor Dual-Output DC-DC Converter with … · 2015. 11. 24. · Proposal! ZVS is one of the soft-switching methods for switching loss reduction (ZVS:Zero](https://reader033.vdocuments.net/reader033/viewer/2022052616/60a6e1a8343e8466195641d6/html5/thumbnails/41.jpg)
GUNMA UNIVERSITY TAKAI-LAB
Summary and Future works
41
Thank you for listening.
謝謝
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GUNMA UNIVERSITY TAKAI-LAB
Q&A
42
Q1.この回路の動作はCCMですか?
A1.いいえ。SIDO ConverterはDCM動作をさせる必要があります。
Q2.SIDOはSISOより出力リプルが大きくなるような気がしますが?
A2.That’s right!