single inductor dc-dc converter with bipolar outputs using ......input voltage vin:3.5v inductor...
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GunmaUniversity Takai
LaboratoryAnalogCircuit
Single Inductor DC-DC Converterwith Bipolar Outputs using Charge Pump
Kenji Takahashi,Hajime Yokoo,Shunsuke Miwa,Kengo Thusida,Hiroyuki Iwase,Kazuki Murakami,Nobukazu Takai,HaruoKobayashi,Takahiro Odaguchi,Shigeki Takayama,Isao Fukai,and Jun-ichi Matsuda
Graduate School of Electrical EngineeringFaculty of Engineering
Gunma University,Gunma Japan Asahi Kasei Toko Power Devices Corporation
2010年12月13日月曜日
GUNMA UNIVERSITY TAKAI-LAB
Outline
2
①Introduction
②SIMO DC-DC Converter
③Simulation Results
④Conclusion
2010年12月13日月曜日
GUNMA UNIVERSITY TAKAI-LAB
Outline
3
①Introduction
②SIMO DC-DC Converter
③Simulation Results
④Conclusion
2010年12月13日月曜日
GUNMA UNIVERSITY TAKAI-LAB
Introduction
4
High Efficiency and Extremely Small System Solution
Industry Demands
Switching Regulator
Linear Regulator Circuit Size:SmallEfficiency 30~60%
Switching Regulator Efficiency 70~90% Circuit Size:Large
Conventional Power Supply Circuits
Optimize Efficiency
2010年12月13日月曜日
GUNMA UNIVERSITY TAKAI-LAB 5
Digital Camera
Positive Voltage:15V
Negative Voltage:−8V
OLED Display
Positive Voltage:5VNegative Voltage:−2V
Vop
Vom
Multi Output Power Supply Circuit
Switching Regulator
Introduction
Multi Output Power Supply Circuit
2010年12月13日月曜日
GUNMA UNIVERSITY TAKAI-LAB 6
Multi Output Power Supply Circuit
One Inductor is Removed
Vop
Vom
Vop
Vom
Single Inductor
Multi Output Power Supply Circuit
High Efficiency and Extremely Small System Solution
Industry Demands
Introduction
SIMO DC-DC ConverterSIMO:single inductor multi output
2010年12月13日月曜日
GUNMA UNIVERSITY TAKAI-LAB
Outline
7
①Introduction
②SIMO DC-DC Converter
③Simulation Results
④Conclusion
2010年12月13日月曜日
Vom = −Vop + VF
GUNMA UNIVERSITY TAKAI-LAB
Conventional Circuit
8
ON
OFF
OFF
Negative Voltage:
Negative Output Depends on Positive Output
!!
S1
S2
S3
Sf
CL D
Vop
VomVi
Positive
Negative
S1
S3
Stage2
S2
s
ON ON
ON ON
Stage1
OFF
OFF
Sf
OFF OFF
OFF OFFOFF ON ON
OFF
OFF OFFON ON
TsIL
Inductor Current WaveformTs:1cycle
Cause:S2 & S3 are on Simultaneously
Stage3
Timing DiagramSIMO DC-DC Converter
2010年12月13日月曜日
GUNMA UNIVERSITY TAKAI-LAB 9
テキスト
S1
S3
Stage2
S2
s
ON ON
ON ON
Stage1
OFF
OFF
Sf
OFF OFF
OFF OFFOFF ON ON
OFF
OFF OFFON ON
TsIL
Stage3
Conventional Timing Diagram
sStage1 Stage2
Stage3Stage4
Stage5
S1
S3
S2
Sf
ON
OFF ON
OFF
ON
OFFOFFON
ONOFF OFF
OFF
OFF
Stage6
ON
Ts
Ip
IB
IL
Change!
Proposed Timing Diagram
Tp Tm
Ts:1cycleTs:1cycle
Inductor Current WaveformInductor Current Waveform
Inductor Current is Changed
The duty ratio of each switch is fixed
Change of Timing Diagram
2010年12月13日月曜日
GUNMA UNIVERSITY TAKAI-LAB 10
sStage1 Stage2
Stage3Stage4
Stage5
S1
S3
S2
Sf
ON
OFF ON
OFF
ON
OFFOFFON
ONOFF OFF
OFF
OFF
Stage6
ON
Proposed timing diagram
Ts
Ts:1cycle
T1 T2 T3 T4 T5 T6Ip
IB
ILInductor Current Waveform
Ip2
!!
S1
S2
S3
Sf
CL D
Vop
VomVi
SIMO DC-DC Converter
Operation of Switch Sf
Maintains the value of the current in the inductor.
Change of Timing Diagram
2010年12月13日月曜日
sStage1 Stage2
Stage3Stage4
Stage5
S1
S3
S2
Sf
ON
OFF ON
OFF
ON
OFFOFFON
ONOFF OFF
OFF
OFF
Stage6
ON
Proposed timing diagram
Ts
Ts:1cycle
T1 T2 T3 T4 T5 T6Ip
IB
ILInductor Current Waveform
Ip2
Stage1
!!
S1
S2
S3
Sf
CL D
Vop
Vom
IL =Vi
Lt =
Ip − IB
T1t
GUNMA UNIVERSITY TAKAI-LAB 11
S1: Turns on ☞
Vi
Ip2
SIMO DC-DC Converter
Inductor L stores energy from voltage Vin
Current that flows to inductor L
Change of Timing Diagram
2010年12月13日月曜日
sStage1 Stage2
Stage3Stage4
Stage5
S1
S3
S2
Sf
ON
OFF ON
OFF
ON
OFFOFFON
ONOFF OFF
OFF
OFF
Stage6
ON
Proposed timing diagram
Ts
Ts:1cycle
T1 T2 T3 T4 T5 T6Ip
IB
ILInductor Current Waveform
Ip2
IL =Vop − Vi
Lt =
Ip − IB
T2t
Stage2
!!
S1
S2
S3
Sf
CL D
Vop
Vom
GUNMA UNIVERSITY TAKAI-LAB 12
S2:Turn on・・・Inductor L supplies its energy to output terminal of Vop
+
ー
Vi
Ip2
IL =Vi
Lt =
Ip − IB
T1t
Equation of Stage1 Vop =T1 + T2
T2Vi
SIMO DC-DC Converter
Change of Timing Diagram
2010年12月13日月曜日
sStage1 Stage2
Stage3Stage4
Stage5
S1
S3
S2
Sf
ON
OFF ON
OFF
ON
OFFOFFON
ONOFF OFF
OFF
OFF
Stage6
ON
Proposed timing diagram
Ts
Ts:1cycle
T1 T2 T3 T4 T5 T6Ip
IB
ILInductor Current Waveform
Ip2
Stage3
!!
S1
S2
S3
Sf
CL D
Vop
Vom
GUNMA UNIVERSITY TAKAI-LAB 13
Sf:Turn on・・・
Vi
Ip2
SIMO DC-DC Converter
The current of the inductor is maintained with the free wheel switch
Change of Timing Diagram
2010年12月13日月曜日
sStage1 Stage2
Stage3Stage4
Stage5
S1
S3
S2
Sf
ON
OFF ON
OFF
ON
OFFOFFON
ONOFF OFF
OFF
OFF
Stage6
ON
Proposed timing diagram
Ts
Ts:1cycle
T1 T2 T3 T4 T5 T6Ip
IB
ILInductor Current Waveform
Ip2
Stage4
!!
S1
S2
S3
Sf
CL D
Vop
Vom
IL =Vi
Lt =
Ip2 − IB
T4t
GUNMA UNIVERSITY TAKAI-LAB
S1:Turn on・・・
Vi
Ip2
14
SIMO DC-DC Converter
Inductor L stores energy from voltage Vin
Current that flows to inductor L
Change of Timing Diagram
2010年12月13日月曜日
sStage1 Stage2
Stage3Stage4
Stage5
S1
S3
S2
Sf
ON
OFF ON
OFF
ON
OFFOFFON
ONOFF OFF
OFF
OFF
Stage6
ON
Proposed timing diagram
Ts
Ts:1cycle
T1 T2 T3 T4 T5 T6Ip
IB
ILInductor Current Waveform
Ip2
Stage5
!!
S1
S2
S3
Sf
CL D
Vop
Vom
GUNMA UNIVERSITY TAKAI-LAB
S3:Turn on・・・
Vi
Ip2+ ー
15
IL = −Vi − Vc
Lt = −Ip2 − IB
T5t
SIMO DC-DC Converter
Charge pump capacitor Cc charges energy from the inductor
Current that flows to inductor L
Change of Timing Diagram
2010年12月13日月曜日
sStage1 Stage2
Stage3Stage4
Stage5
S1
S3
S2
Sf
ON
OFF ON
OFF
ON
OFFOFFON
ONOFF OFF
OFF
OFF
Stage6
ON
Proposed timing diagram
Ts
Ts:1cycle
T1 T2 T3 T4 T5 T6Ip
IB
ILInductor Current Waveform
Ip2
Stage6
!!
S1
S2
S3
Sf
CL D
Vop
Vom
GUNMA UNIVERSITY TAKAI-LAB
Vi
Ip2+ ー
16
SIMO DC-DC Converter
Sf:Turn on・・・The current of the inductor is maintained with the free wheel switch
Change of Timing Diagram
2010年12月13日月曜日
sStage1 Stage2
Stage3Stage4
Stage5
S1
S3
S2
Sf
ON
OFF ON
OFF
ON
OFFOFFON
ONOFF OFF
OFF
OFF
Stage6
ON
Proposed timing diagram
Ts
Ts:1cycle
T1 T2 T3 T4 T5 T6Ip
IB
ILInductor Current Waveform
Ip2
Stage1
!!
S1
S2
S3
Sf
CL D
Vop
Vom
IL = −Vi − Vc
Lt = −Ip2 − IB
T5t
Vom = −T4 + T5T5
Vi
GUNMA UNIVERSITY TAKAI-LAB 17
S1:Turn on・・・Energy of capacitor is discharged and negative voltage Vom are given
ー
+
Vi
Ip2+ ー
Equation of Stage4
Equation of Stage5
IL =Vi
Lt =
Ip2 − IB
T4t
SIMO DC-DC Converter
Change of Timing Diagram
2010年12月13日月曜日
sStage1 Stage2
Stage3Stage4
Stage5
S1
S3
S2
Sf
ON
OFF ON
OFF
ON
OFFOFFON
ONOFF OFF
OFF
OFF
Stage6
ON
Propose timing diagram
Ts
Ts:1cycle
T1 T2 T3 T4 T5 T6Ip
IB
ILinductor current waveform
!!
S1
S2
S3
Sf
CL D
Vop
Vom
Vom = −T4 + T5T5
Vi + VF = −D4 + D5D5
Vi + VF
Vop =T1 + T2
T2Vi =
D1 + D2D2
Vi
GUNMA UNIVERSITY TAKAI-LAB 18
Negative output voltage can be changed independently
Ip2
Vi
SIMO DC-DC Converter
Change of Timing Diagram
2010年12月13日月曜日
GUNMA UNIVERSITY TAKAI-LAB
Outline
19
①Introduction
②SIMO DC-DC Converter
③Simulation Results
④Conclusion
2010年12月13日月曜日
GUNMA UNIVERSITY TAKAI-LAB
Simulation Results
20
Simulation Condition
Switching Frequency:500kHz
Input Voltage Vin:3.5V
Inductor L:2u
Output Capacitor Cout:10u
Load Resistance Ro:15ΩCharge Pump Capacitor Cc:5u
Vi
!!
S1
S2
S3
Sf
CL D
Vop
Vom
SIMO DC-DC Converter
2010年12月13日月曜日
GUNMA UNIVERSITY TAKAI-LAB 21
Positive Output Voltage:7V
Simulation Results(Conventional)
Positive Output Voltage:10.5V Positive Voltage
Negative Voltage
Positive Voltage
Negative Voltage
Negative Output Voltage:-5.93V Negative Output Voltage:-9V
2010年12月13日月曜日
GUNMA UNIVERSITY TAKAI-LAB 22
Simulation Results(Conventional)
Negative Voltage:Vom = −Vop + VF
A negative voltage depends on a positive voltageConventional Circuit
Positive Voltage Positive Voltage Ripple (Vpp) Negative Voltage Negative Voltage
Ripple (Vpp)
6.89V10.1V
75.5mV119.7mV
-5.9V-9.1V
54.3mV87.9mV
2010年12月13日月曜日
Positive Output Voltage:6.7V
GUNMA UNIVERSITY TAKAI-LAB 23
Simulation Results(Proposed)Positive Output Voltage:6.7V
Positive Voltage
Negative Voltage Negative Voltage
Positive Voltage
Negative Output Voltage:-4.54V Negative Output Voltage:-6.3V
2010年12月13日月曜日
GUNMA UNIVERSITY TAKAI-LAB 24
Setting output voltage Positive Voltage Positive Voltage Ripple (Vpp) Negative Voltage Negative Voltage
Ripple (Vpp)
6.7V 50.8mV-4.5V-6.3V
20.8mV27.1mV
50.8mV6.7V
Proposed Timing Daigram
Positive Voltage Positive Voltage Ripple (Vpp) Negative Voltage Negative Voltage
Ripple (Vpp)
6.9V10.1V
75.5mV119.7mV
-5.9V-9.1V
54.2mV87.9mV
Conventional Timing Daigram
Voltage Ripple has Decreased
Simulation Results
2010年12月13日月曜日
GUNMA UNIVERSITY TAKAI-LAB 25
Inductor Current Waveform
Conventional
Proposed
Current Ripple (Vpp)
630.4mA1.35A
Inductor Current Waveform
Inductor Current Ripple is Reduced by 50%
Conventional
Proposed
At The One Cycle
Proposed
Inductor L is two charge &discharge
Inductor L is one charge &discharge
Conventioanl
2010年12月13日月曜日
GUNMA UNIVERSITY TAKAI-LAB 26
Output Voltage Waveformtime(ms)
(V)
(V)
7.0
Negative output voltage depends on positive output voltage
Transient Response (Conventional)
Transient Response
2010年12月13日月曜日
GUNMA UNIVERSITY TAKAI-LAB 27
time(ms)
Negative output voltage independent of positive output voltage
Cross-regulation is Improved
Output Voltage Waveform
Transient response(Proposed)Transient Response
2010年12月13日月曜日
GUNMA UNIVERSITY TAKAI-LAB
Outline
28
①Introduction
②SIMO DC-DC Converter
③Simulation Results
④Conclusion
2010年12月13日月曜日
GUNMA UNIVERSITY TAKAI-LAB
Conclusion
29
A new timing diagram is proposed
・Independent positive and negative output voltage
・Voltage ripple and inductor ripple less than conventional timing diagram
・Cross-regulation is improved
2010年12月13日月曜日
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