Download A Family of Single-Stage Switched

A Family of Single-Stage
Switched-Capacitor–Inductor
PWM Converters
IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 28,
NO. 11, NOVEMBER 2013
YuanmaoYe and K. W. E. Cheng
Reporter: Yu-Kai Lin
1
Outline
Introduction
2. Configuration(New Family of SCI Converters)
3. Detailed Analysis and Design Considerations
4. Simulation and Experimental Results
1.
2
5.
Conclusion
6.
Personal Remark
1.Introduction(1/4)
 A family of single-stage-switched-capacitor–inductor
converters with different voltage conversion features
and similar structures is presented in this paper.
 Unlike
conventional switched-capacitor/switchedinductor converters that are produced by cascade
operation, all of the proposed converters are operated
in single-stage mode.
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1.Introduction(2/4)
 The basic switched-mode dc–dc converters including
(buck, boost, buck–boost, cuk, zeta, and sepic) have
been used in various electronic applications due to
their numerous advantages such as simple structure,
good performance, high efficiency, easy design, and
simple control circuit.
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1.Introduction(3/4)
 A small resonant inductor has been added in SC
converters to eliminate the current peak, therefore, the
SC converters have good performance and high
efficiency as well.
 Even though these converters have different structures
and can provide different voltage conversion ratios,
they have a characteristic in common which is that all
of them are multistage combination of switchedinductor cells and SC cells
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1.Introduction(4/4)
 The greatest feature of these converters is that energy
flowing from input power sources is directly
transferred to the two energy transfer components (𝐶1
and 𝐿1 ) and then directly released to output terminal.
 These converters are actually single-stage DC–DC
converters rather than like aforementioned converters
obtained high voltage gain by using different
cascading methods.
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2.Configuration(1/8)
 Each of the circuits uses only one
active switch Q and a very small
resonant inductor 𝐿𝑟 which is
employed to limit the current peak
caused by capacitor 𝐶1 when the
switch Q is turned ON.
Fig. 2. New family of SCI converters. (a) Dual-input step-up converter.
(b) Single-input step-up converter. (c) Dual-input step-down converter.
(d) Single-input step-down converter. (e) Inverting step-up converter.
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2.Configuration(2/8)
 The
two energy storage
components 𝐶1 and 𝐿1 are
charged in parallel by input
sources 𝑉1 and 𝑉2 , respectively,
when switch Q is turned ON,
and discharging in series to
output terminal when Q is
turned OFF.
 where d is the duty ratio of the converter, 𝑉1 and 𝑉2
are input voltages, and 𝑉𝑜 is the output voltage.
1
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 𝑉𝑜 = 𝑉1 +
𝑉
1−𝑑 2
2.Configuration(3/8)
 when its two input terminals both are connected to the
same power source 𝑉𝑖𝑛 , i.e., 𝑉1 = 𝑉2 = 𝑉𝑖𝑛 .
 𝑉𝑜 =
9
2−𝑑
𝑉
1−𝑑 𝑖𝑛
2.Configuration(4/8)
 Its
two energy storage
components 𝐶1 and 𝐿1 are
charged in series by the
difference levels of the two
input sources 𝑉1 and 𝑉2 when
the switch Q is turned OFF,
and discharge in parallel to
output terminal when Q is
turned ON.
 𝑉0 = 𝑉1 − (1 − 𝑑)𝑉2
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 The condition for the normal
operation of this converter is
that the level of 𝑉1 is higher
than 𝑉2 .
2.Configuration(5/8)
 The dual−input step−down converter [see Fig. 2(c)] when
its lower level input terminal 𝑉2 is connected together with
the output terminal 𝑉2 =𝑉𝑜 as the new output, i.e.,𝑉2 =𝑉𝑜 .
 𝑉0 =
11
1
𝑉
2−𝑑 𝑖𝑛
2.Configuration(6/8)
 When switch Q is turned ON,
𝐿1 and 𝐶1 are charged in
parallel and discharges in series
when switch Q is turned OFF.
 Therefore, the voltage across
𝐶1 is the same as input voltage
Vin .
 𝑉𝑜 = −
12
1
𝑉𝑖𝑛
1−𝑑
2.Configuration(7/8)
 However, there is no member in Fig. 2 that can provide high
step-down and inverting step-down output levels. To compensate
for the two deficiencies, two new members are developed to
expand the proposed family as shown in Fig. 3.
 Fig. 3. Two new members of the proposed SCI converters family. (a) High step-
down SCI converter. (b) Inverting step-down SCI converter.
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2.Configuration(8/8)
 (a)High step down:
𝑑
𝑉𝑜 =
𝑉𝑖𝑛
1+𝑑
 (b)Inverting step down:
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𝑉𝑜 = −𝑑𝑉𝑖𝑛
3.Analysis and Design(1/4)
 State I (𝑡0 − 𝑡1 ):
1
 𝑖𝐶1 = 𝐼𝐶1 𝑠𝑖𝑛𝜔0 𝑡 − 𝑡0 , 𝜔 =
0
𝐿𝑟 𝐶1
 𝑉𝐶1 = 𝑉1 −
∆𝑉𝐶1
𝑐𝑜𝑠𝜔0
2
𝑉2
𝑡 − 𝑡0
 𝑖𝐿1 = 𝐼𝐿1−𝑚𝑖𝑛 +
𝑡 − 𝑡0
𝐿1
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3.Analysis and Design(2/4)
 State II (𝑡1 − 𝑡2 ):
 𝑖𝐿1−𝑚𝑎𝑥 =
𝑉2
𝐼𝐿1−𝑚𝑖𝑛 + 𝑑𝑇𝑠
𝐿1
 𝑇𝑠 ≪ 2𝜋 𝐿1 𝐶1
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3.Analysis and Design(3/4)
 State III (𝑡2 − 𝑡3 ):
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 𝑖𝐿1 = −𝑖𝐶1 = 𝐼𝐿1−𝑚𝑎𝑥 −
𝑉0 −𝑉2 −𝑉𝐶1
(𝑡
𝐿1
 𝑖𝐿1 = −𝑖𝐶1 ≈ 𝐼𝐿1−𝑚𝑎𝑥 −
𝑉0 −𝑉2 −𝑉1
(𝑡
𝐿1
− 𝑡2 )
− 𝑡2 )
3.Analysis and Design(4/4)
Design Considerations
1.𝑓0 =
1
2𝜋 𝐿𝑟 𝐶1
>
1
2𝑑𝑚𝑖𝑛 𝑇𝑠
usually, the switching frequency is higher than 50 kHz
2.𝐶1 =
3.𝐿𝑟 =
4.𝐿1 =
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𝐼𝑂−𝑚𝑎𝑥 𝑇𝑠
∆𝑉𝐶1
1
4𝜋2 𝑓0
2
𝐶1
𝑉2
𝑑𝑚𝑎𝑥 𝑇𝑠
∆𝐼𝐿1
4.Simulation(1/5)
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4.Simulation(2/5)
𝑉𝐺𝑆
𝑉2
𝑉𝐶1
𝑉1
𝐼𝐿1
𝑖𝐶1
𝐼𝐷1
𝑉𝐷𝑆
𝐷1
𝑉𝑜
𝐷2
𝐼𝑄
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𝐼𝑜
𝐼𝐷2
4.Simulation(3/5)
 duty ratio is 0.5. (a) Simulated results. (b) Experimental results.
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4.Simulation(4/5)
V1 = 30 V, V2 = 20 V, d = 0.5, IO = 2.4 A
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4.Simulation(5/5)
 (a) Efficiency versus output power. (b) Output voltage versus output power.
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5.Conclusion(1/2)
 The proposed converters employ two energy transfer
components (one SC and one inductor) and do not use the
cascade method like conventional SC/switched-inductor
converters.
 This design can meet the high efficiency requirement with a
simple structure.
 The other members of the proposed family have also been
simulated and their operations have been confirmed.
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5.Conclusion(2/2)
 Fig. 2(b) is always higher than twice the input voltage and
is only suitable for high voltage gain applications.
 Similar problem is also found in the high step-down
member [see Fig. 3(a)].
 proposed step-up converters can provide both higher and
lower voltage levels than input voltage under different duty
ratios.
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6.Personal Remark
 In this paper the experimental circuit switch use
IRFI540N,but simulated didn’t use this so the
result will different.
 In this paper author propose seven’s different
circuit, but only experiment one circuit.
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6.Personal Remark
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Thank your for listening
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