WO2014129707A1 - Convertisseur de courant continu à sorties multiples utilisant un condensateur commuté - Google Patents

Convertisseur de courant continu à sorties multiples utilisant un condensateur commuté Download PDF

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Publication number
WO2014129707A1
WO2014129707A1 PCT/KR2013/005942 KR2013005942W WO2014129707A1 WO 2014129707 A1 WO2014129707 A1 WO 2014129707A1 KR 2013005942 W KR2013005942 W KR 2013005942W WO 2014129707 A1 WO2014129707 A1 WO 2014129707A1
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WO
WIPO (PCT)
Prior art keywords
switch
output
voltage
control signal
string
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Application number
PCT/KR2013/005942
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English (en)
Korean (ko)
Inventor
백동현
이정윤
김영진
윤선우
Original Assignee
중앙대학교 산학협력단
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Publication of WO2014129707A1 publication Critical patent/WO2014129707A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
    • H02M3/073—Charge pumps of the Schenkel-type
    • H02M3/077—Charge pumps of the Schenkel-type with parallel connected charge pump stages

Definitions

  • Embodiments of the present invention relate to a multiple output DC-DC converter using a switched capacitor, and more particularly, multiple output using a switched capacitor capable of high efficiency power conversion multiple output and efficiently reducing the ripple of the output voltage. It relates to a DC-DC converter.
  • SoC System on Chip
  • Inductor-based switching converters have the advantage of having a wide range of output voltages to ensure high efficiency, and only one inductor can reduce the size and cost of the converter.
  • Switched-capacitor (SC) converters on the other hand, do not require an inductor for voltage conversion, and thus have received a lot of attention because they can achieve high efficiency without the need for an additional process.
  • the present invention proposes a multiple output DC-DC converter using a switched capacitor capable of high efficiency multiple output and efficiently reduce the ripple of the output voltage.
  • a control signal generation unit for generating a switching control signal so that a plurality of output voltage corresponding to each reference voltage level; And an output unit configured to output an input voltage to a plurality of output terminals based on the switching control signal, wherein the output unit comprises N (two or more natural numbers) switched capacitor cells sharing the plurality of output terminals.
  • Each of the N switched capacitor cells includes: a common capacitor configured to charge and discharge the input voltage; And a plurality of switch strings configured to charge the input voltage to the common capacitor and to switch the charged voltages to be outputted to the plurality of output terminals.
  • the number of the plurality of switch strings is the same as the number of the plurality of output terminals, and the first switch string of the plurality of switch strings may switch the charged voltage to be output to the first output terminal of the plurality of output terminals. have.
  • the first switch string may include a 1-1 switch to which the input voltage is applied at one end; A 2-1 switch having one end connected to the other end of the 1-1 switch and one end of the common capacitor; 1-2 switches, one end of which is connected to the other end of the 2-1 switch and the first output terminal; And a 2-2 switch having one end connected to the other end of the 1-2 switch and the other end of the common capacitor, and the other end connected to the ground.
  • a second switch string of the plurality of switch strings switches the charged voltage to be output to a second output terminal of the plurality of output terminals, and the second switch string is 1-1 to which the input voltage is applied at one end.
  • switch A 2-1 switch having one end connected to the other end of the 1-1 switch of the first switch string, the other end of the 1-1 switch of the second switch string, and one end of the common capacitor; 1-2 switches, one end of which is connected to the other end of the 2-1 switch of the second switch string and the second output terminal;
  • a 2-2 switch having one end connected to the other end of the 1-2 switch of the first switch string, the other end of the 1-2 switch of the second switch string, and the other end of the common capacitor, and the other end connected to the ground.
  • the control signal generation unit may include: a first comparator configured to compare a first output voltage output to the first output terminal with a first reference voltage; And a second comparator for comparing the first output voltage with a second reference voltage, wherein a value corresponding to the first output voltage between the first reference voltage and the second reference voltage based on the comparison result.
  • the first switching control signal to have a can be generated.
  • the control signal generator generates the first switching control signal using an N-bit binary counter, wherein the N first switch strings constituting the N switched capacitor cells correspond to the N-bit binary counter value. It can work.
  • the control signal generator adds 1 to the N-bit binary counter when the first output voltage is lower than the first and second reference voltages as a result of the comparison by the comparator, and the first output voltage is the first output voltage.
  • 1 may be subtracted from the N-bit binary counter.
  • FIG. 1 is a view showing an overall schematic diagram of a multiple output DC-DC converter using a switched capacitor according to an embodiment of the present invention.
  • FIG. 2 is a diagram showing in more detail the schematic diagram of FIG. 1 centering on an output unit.
  • FIG. 3 is a diagram illustrating a detailed configuration of an output unit according to an embodiment of the present invention.
  • FIG. 4 is a diagram illustrating an operation of a first switch string controlled using a switching control signal according to an embodiment of the present invention.
  • FIG. 1 is a diagram showing an overall schematic diagram of a multiple output DC-DC converter 100 using a switched capacitor according to an embodiment of the present invention.
  • FIG. 2 is a diagram illustrating the schematic diagram of FIG. 1 in more detail with reference to the output unit 120.
  • FIG. 3 is a diagram illustrating a detailed configuration of the output unit 120 according to an embodiment of the present invention. .
  • a multiple output DC-DC converter (hereinafter, referred to as a 'DC-DC converter' for convenience of description) using a switched capacitor includes a control signal generator 110 and an output unit ( 120).
  • control signal generator 110 generates a switching control signal such that the multiple output voltages correspond to respective reference voltage levels.
  • control signal generator 110 may include a first comparator 111 and a second comparator 112, and three output voltages may be referenced to each reference voltage level by using a comparison result by the two comparators. It is possible to generate a switching control signal to be equivalent to.
  • the output unit 120 outputs an input voltage to three output terminals based on the switching control signal.
  • the output unit 120 may be composed of eight switched capacitor cells 121, 122, 123, ..., 128 sharing three output terminals, each of the eight switched capacitor cells It may include a common capacitor for charging and discharging the input voltage, three switch strings for charging the input voltage to the common capacitor, and switching so that the charged voltage is output to the three output terminals.
  • the first switched capacitor cell 121 includes a common capacitor 1212, a first switch string 1214, a second switch string 1216, and a third switch string 1218.
  • the second switched capacitor cell 122 also includes a common capacitor 1222, a first switch string 1224, a second switch string 1226, and a third switch string 1228, in the same manner as the eight switched Capacitor cell 128 also includes a common capacitor 1282, a first switch sequence 1284, a second switch sequence 1286, and a third switch sequence 1288, respectively.
  • the first switch string included in each of the eight switched capacitor cells That is, the first output voltage is output to the first output terminal V OUT_A by the eight first switch strings 1214, 1224, 1234,..., 1284.
  • the second output voltage is output to the second output terminal V OUT_B by the eight second switch strings 1216, 1226, 1236,..., And 1286 included in each of the eight switched capacitor cells.
  • the third output voltage is output to the third output terminal V OUT_C by the eight third switch strings 1218, 1228, 1238,..., And 1288 included in each of the switched capacitor cells.
  • the number of switch strings is preferably equal to the number of output terminals.
  • control signal generator 110 since the output unit 120 is composed of eight switched capacitor cells, in the present invention, the control signal generator 110 generates a control signal for the operation of the eight switched capacitor cells using an 8-bit binary counter. It will be explained on the assumption.
  • the operation of a total of eight first switch strings included in eight switched capacitor cells is controlled by a first 8-bit binary counter, and eight second switch strings are controlled by a second 8-bit binary counter.
  • the operations of the eighth switch arrays are controlled by the eighth eight-bit binary counter.
  • the present invention is not limited thereto, and it will be apparent to those skilled in the art that a higher number of switched capacitor cells and corresponding higher bit binary counters may be used as needed.
  • the first output voltage among the three output voltages is output to the first output terminal V OUT_A among the three output terminals by the DC-DC converter 100 according to the embodiment of the present invention.
  • the first output voltage will be described based on an operation in which the output level is determined by the operation of the first switch string, that is, the eight first switch strings, of the three switch strings included in the eight switched capacitor cells.
  • the switch according to an embodiment of the present invention is preferably a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) device.
  • MOSFET Metal Oxide Semiconductor Field Effect Transistor
  • the first switch string 1214 may include four switches, and an input voltage VDD is applied to one end of the 1-1 switch 1214a among the four switches.
  • One end of the 2-1 switch 1214b is connected to the other end of the 1-1 switch 1214a and one end of the common capacitor 1212, and one end of the 1-2 switch 1214c is sequentially connected to the 2-1 switch. It is connected to the other end of the 1214b and the first output terminal (V OUT_A ).
  • One end of the 2-2 switch 1214d is connected to the other end of the 1-2 switch 1214c and the other end of the common capacitor 1212, and the other end of the 2-2 switch 1214d is connected to ground to form a circuit diagram. do.
  • the second switch string 1216 may also include four switches, and the input voltage VDD is applied to one end of the 1-1 switch 1216a among the four switches.
  • One end of the 2-1 switch 1216b is connected to the other end of the 1-1 switch 1216a, one end of the common capacitor 1212, and the other end of the 1-1 switch 1214a of the first switch string, and sequentially One end of the 1-2 switch 1216c is connected to the other end of the 2-1 switch 1216b and the second output terminal V OUT_B .
  • One end of the 2-2 switch 1216d is connected to the other end of the 1-2 switch 1216c, the other end of the common capacitor 1212, and the other end of the 1-2 switch 1214c of the first switch string.
  • the other end of the second switch 1216d is connected to ground.
  • the input voltage VDD is applied to one end of the 1-1 switch 1218a among the four switches of the third switch string 1218, and one end of the 2-1 switch 1218b is applied to the 1-1 switch ( The other end of 1218a, one end of the common capacitor 1212, the other end of the 1-1 switch 1214a of the first switch string, and the other end of the 1-1 switch 1216a of the second switch string.
  • One end of the 1-2 switch 1218c is connected to the other end of the 2-1 switch 1218b and the third output terminal V OUT_C , and one end of the 2-2 switch 1218d is connected to the 1-2 switch 1218c. Is connected to the other end of), the other end of the common capacitor 1212, the other end of the 1-2 switch 1214c of the first switch string, and the other end of the 1-2 switch 1216c of the second switch string, and the 2-2 switch 1218d. The other end of) is connected to ground.
  • the eight switched capacitor cells (121, 122, ..., 128) are three output terminals (V OUT_A, V OUT_B, V OUT_C) as described above, the first output terminal (V OUT_A ) Is not only connected to the other end of the 2-1 switch 1214b of the first switch capacitor cell 121 and one end of the 1-2 switch 1214c, but also to the first switch of the second switched capacitor cell 122.
  • the second output terminal V OUT_B and the third output terminal V OUT_C are also the same, and thus a detailed description thereof will be omitted.
  • control signal generator 110 uses the comparison result of the first comparator 111 and the second comparator 112 as a reference to the first output voltage output to the first output terminal V OUT_A . Generate a switching control signal that corresponds to the voltage level.
  • the first comparator 111 provides a result of comparing the first output voltage output to the first output terminal V OUT_A with the first reference voltage V REF_A_H to the control signal generator 110.
  • the second comparator 112 may provide a result of the comparison with the second reference voltage V REF_A_L to the control signal generator 110.
  • V REF_A_H higher than the first reference voltage (V REF_A_H) a second reference voltage (V REF_A_L), and the difference is assumed to be 0.1V.
  • control signal generation unit 110 generates a first switching control signal such that the first output voltage has a value corresponding between the first reference voltage and the second reference voltage based on the comparison result by the two comparators. .
  • the control signal generator 110 when it is determined that the output voltage is higher than the first reference voltage and the second reference voltage as a result of the comparison by the first comparator 111 and the second comparator 112, the control signal generator 110 outputs the output.
  • a control signal for lowering the voltage for example, a down signal may be generated.
  • the control signal generator 110 is a control signal for increasing the output voltage, for example, an up signal. May occur.
  • control signal generator is a control signal for maintaining the output voltage as it is. lock) signal may be generated.
  • the generation of the up, down, and lock signals may be performed by the up / down determination unit 113 included in the control signal generator 110.
  • control signal generator 110 uses the generated up, down, and lock signals to generate a bit in the form of a synchronized binary counter for controlling the eight first switch strings constituting the eight switched capacitor cells.
  • control signal generator 110 may output a bit having a value added by 1 every clock by using the up signal generated by the up / down determination unit 113, and by using the down signal.
  • the bit of the subtracted value may be output for each clock.
  • the eight first switch strings are controlled according to the size of the output bit, thereby determining the level of the first output voltage output through the first output terminal.
  • the output of the bit may be performed by the digital capacitance modulation (DCpM) control unit 114.
  • DCpM digital capacitance modulation
  • control signal generator 110 outputs the output bit, i.e., an 8-bit binary counter type bit that can be output by the DCpM controller 114 and an output bit when the output bit is high.
  • the clock may be output, and if it is low, the clock may not be output.
  • the output of the clock using the output bit and the input clock may be performed by the decoder 115.
  • control signal generator 110 As the number of phases is used, the ripple of the output voltage is reduced, so that the control signal generator 110 according to the embodiment of the present invention has four 0 °, 45 °, 90 °, and 135 ° four. It may further comprise a four-phase generator 116 for outputting the phase.
  • the four-phase generator 116 outputs the four phases using the input clock, so that the interleaved phase method can be applied to the present invention.
  • Switched-capacitor converters are easier to apply multiple interleaved phase schemes compared to inductor-based switching converters, and the reduction of output voltage ripple enables design that greatly reduces or eliminates the load capacitor's capacity, which is advantageous for system-on-chip schemes. Do.
  • control signal generator 110 is a non-overclock generator (non over clock generator) for outputting one input clock as two clocks having different dead time ( 117 may be further included.
  • VDD and GND may be connected to reduce the efficiency of the converter. Therefore, the two switches having different dead times do not turn on at the same time.
  • FIG. 4 is a diagram illustrating an operation of a first switch string controlled using a switching control signal according to an embodiment of the present invention.
  • the first switch string is configured by a decoder and a driver. It can be seen that the operation of the four switches, that is, the voltage applied to the gates of the four MOSFETs is determined.
  • the second switch string and the third switch string included in one switched capacitor cell together with the first switch string are operated in the same manner.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

L'invention concerne un convertisseur de courant continu à sorties multiples utilisant un condensateur commuté. Le convertisseur de courant continu à sorties multiples utilisant un condensateur commuté comprend : une unité de génération de signal de commande permettant de générer un signal de commande commutateur pour faire correspondre une pluralité de tensions de sortie à des niveaux de tension de référence respectifs ; et une unité de sortie permettant de fournir une tension d'entrée à une pluralité de bornes de sortie sur la base du signal de commande commutateur, l'unité de sortie comprenant N (un nombre naturel supérieur ou égal à 2) cellules de condensateurs commutés partageant la pluralité de bornes de sortie, et chacune des cellules de condensateurs commutés comprenant : un condensateur commun qui charge et décharge la tension d'entrée ; et une pluralité de matrices de commutateur qui s'activent et se désactivent de sorte que la tension d'entrée est chargée vers le condensateur commun et que la tension chargée est fournie à la pluralité de bornes de sortie. La présente invention a un avantage capable d'une sortie multiple hautement efficace, et aussi un avantage capable de réduire efficacement les ondulations d'une tension de sortie.
PCT/KR2013/005942 2013-02-19 2013-07-04 Convertisseur de courant continu à sorties multiples utilisant un condensateur commuté WO2014129707A1 (fr)

Applications Claiming Priority (2)

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KR10-2013-0017448 2013-02-19
KR1020130017448A KR101419645B1 (ko) 2013-02-19 2013-02-19 스위치드 커패시터를 이용한 다중 출력 ｄｃ-ｄｃ 컨버터

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KR102285407B1 (ko) * 2015-10-20 2021-08-03 에스케이하이닉스 주식회사 다중 출력 dc-dc 컨버터 시스템
CN108880235B (zh) * 2018-07-25 2021-07-23 华南理工大学 单输入多输出m开关组dc-dc变换器及其控制方法
CN108923651B (zh) * 2018-07-25 2021-06-08 华南理工大学 单输入双输出三开关组dc-dc变换器及其控制方法

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JP2010115049A (ja) * 2008-11-07 2010-05-20 Murata Mfg Co Ltd マルチ出力スイッチング電源装置
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