CN105939108A - A Switched Inductance Quasi-Switch Step-Up DC-DC Converter - Google Patents

A Switched Inductance Quasi-Switch Step-Up DC-DC Converter Download PDF

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CN105939108A
CN105939108A CN201610508664.8A CN201610508664A CN105939108A CN 105939108 A CN105939108 A CN 105939108A CN 201610508664 A CN201610508664 A CN 201610508664A CN 105939108 A CN105939108 A CN 105939108A
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diode
capacitor
inductance
switch
anode
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CN105939108B (en
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张波
朱小全
丘东元
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FUHUA ELECTRONIC Co Ltd
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South China University of Technology SCUT
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of DC power input into DC power output
    • H02M3/02Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M3/00Conversion of DC power input into DC power output
    • H02M3/02Conversion of DC power input into DC power output without intermediate conversion into AC
    • H02M3/04Conversion of DC power input into DC power output without intermediate conversion into AC by static converters
    • H02M3/10Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/1552Boost converters exploiting the leakage inductance of a transformer or of an alternator as boost inductor

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

Abstract

The invention provides a switch inductance type quasi-switch boosting DC-DC converter circuit which comprises a voltage source, a switch inductance unit, a two-end quasi-switch boosting unit, a second MOS (metal oxide semiconductor) tube, a second capacitor, a second diode, an output filter capacitor and a load, wherein the switch inductance unit is composed of a first inductor, a second inductor, a fourth diode, a fifth diode and a sixth diode, the two-end quasi-switch boosting unit is composed of a first capacitor, a first diode, a first MOS tube, a third diode and a switch inductance unit, and the two-end quasi-switch boosting unit is composed of a second capacitor, a first diode. The whole circuit is simple in structure, and the respective single-stage boosting characteristics of the quasi-switch boosting unit, the switch capacitor unit and the switch inductor unit are combined, so that the expansion of output voltage gain is realized.

Description

A kind of switched inductors type quasi-boost switching DC-DC converter
Technical field
The present invention relates to Power Electronic Circuit technical field, be specifically related to a kind of switched inductors type quasi-boost switching DC-DC converter circuit.
Background technology
In fuel cell power generation, photovoltaic generation, the DC voltage provided due to single solaode or single fuel cell is relatively low, the need for electricity of existing electrical equipment cannot be met, grid-connected demand can not be met, generally require the voltage reaching required that is together in series by multiple batteries.On the one hand this method greatly reduces the reliability of whole system, the most also needs to solve series average-voltage problem.For this reason, it may be necessary to can be high-tension high-gain DC-DC converter low voltage transition.The switching boost converter SBI proposed in recent years is little due to the excursion of its output voltage, and in the occasion of low-voltage high input voltage output, such as distributed energy grid-connected system and fuel cell system, tradition SBI changer becomes no longer to be suitable for.In order to expand the scope of application of tradition SBI changer, it is necessary to improved by topology and expand its output voltage gain.
Summary of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, it is provided that a kind of switched inductors type quasi-boost switching DC-DC converter circuit, concrete technical scheme is as follows.
A kind of switched inductors type quasi-boost switching DC-DC converter circuit, including voltage source, by the first inductance, the switched inductors unit that second inductance, the 4th diode, the 5th diode and the 6th diode are constituted, by the first electric capacity, the first diode, the first metal-oxide-semiconductor, the two ends quasi-boost switching unit that 3rd diode and switched inductors unit are constituted, second metal-oxide-semiconductor, the second electric capacity, the second diode, output diode, output filter capacitor and load are constituted.
In above-mentioned a kind of switched inductors type quasi-boost switching DC-DC converter circuit, the positive pole of described voltage source is connected with the negative pole of the first electric capacity and the anode of the 3rd diode respectively;The positive pole of described first electric capacity anode with negative electrode, the drain electrode of the first metal-oxide-semiconductor and the output diode of the first diode respectively is connected;The source electrode of described first metal-oxide-semiconductor anode with negative electrode, one end of the first inductance and the 4th diode of the 3rd diode respectively is connected;The negative electrode of described 4th diode is connected with the negative electrode of the 5th diode and one end of the second inductance respectively;The other end of described first inductance is connected with the anode of the 5th diode and the anode of the 6th diode respectively;The anode of described first diode negative electrode with the other end, the drain electrode of the second metal-oxide-semiconductor, the positive pole of the second electric capacity and the 6th diode of the second inductance respectively is connected;The negative pole of described second electric capacity one end with the anode of the second diode, the negative pole of output filter capacitor and load respectively is connected;The negative electrode of described output diode is connected with the positive pole of output filter capacitor and the other end of load respectively;The negative pole of described voltage source is connected with source electrode, the negative electrode of the second diode of the second metal-oxide-semiconductor respectively.
Compared with prior art, circuit of the present invention has the advantage that and technique effect: the whole circuit structure of the present invention is simple, and easy to control, output voltage gain is higher;Circuit of the present invention utilizes the single-stage buck characteristic of quasi-boost switching unit and switched inductors and switching capacity to charge parallel the characteristic of discharged in series, thus increases output voltage, it is achieved that the expansion of quasi-switching boost converter output voltage gain.
Accompanying drawing explanation
Fig. 1 is a kind of switched inductors type quasi-boost switching DC-DC converter circuit in the specific embodiment of the invention.
Fig. 2 a, Fig. 2 b are the equivalent circuit diagram that a kind of switched inductors type quasi-boost switching DC-DC converter circuit shown in Fig. 1 simultaneously turned at its first metal-oxide-semiconductor and the second metal-oxide-semiconductor and simultaneously turn off the period respectively.
Fig. 3 is gain curve and Boost, switching capacity Boost, traditional Z source DC-DC converter and the gain curve comparison diagram of novel quasi-Z source DC-DC converter of circuit of the present invention.
Detailed description of the invention
Technical scheme is explained in detail by above content, is embodied as being further described to the present invention below in conjunction with accompanying drawing.
With reference to Fig. 1, a kind of switched inductors type quasi-boost switching DC-DC converter circuit of the present invention, including voltage source, by the first inductance, the second inductance, the 4th diode, the switched inductors unit that 5th diode and the 6th diode are constituted, by the first electric capacity, the first diode, first metal-oxide-semiconductor, the two ends quasi-boost switching unit that 3rd diode and switched inductors unit are constituted, the second metal-oxide-semiconductor, the second electric capacity, second diode, output diode Do, output filter capacitor and load RL.As the first metal-oxide-semiconductor S1With the second metal-oxide-semiconductor S2When simultaneously turning on, described first diode D1, the second diode D2, the 3rd diode D3With the 5th diode D5It is turned off, the 4th diode D4, the 6th diode D6Conducting;Described voltage source ViWith the first electric capacity C1Together to the first inductance L in parallel1With the second inductance L2Charging energy-storing;Meanwhile, voltage source Vi, the first electric capacity C1With the second electric capacity C2Together to output filter capacitor CfWith load RLPower supply.As the first metal-oxide-semiconductor S1With the second metal-oxide-semiconductor S2When simultaneously turning off, described first diode D1, the second diode D2, the 3rd diode D3With the 5th diode D5It is both turned on, the 4th diode D4, the 6th diode D6With output diode DoTurn off;First inductance L1With the second inductance L2With the first electric capacity C after series connection1Parallel connection, forms loop;Described voltage source ViWith the first inductance L1With the second inductance L2Together to the second electric capacity C2Charging, forms loop;Meanwhile, output filter capacitor CfTo load RLIt is powered.Whole circuit structure is simple, has higher output voltage gain.
The concrete connected mode of circuit of the present invention is as follows: the positive pole of described voltage source is connected with the negative pole of the first electric capacity and the anode of the 3rd diode respectively;The positive pole of described first electric capacity anode with negative electrode, the drain electrode of the first metal-oxide-semiconductor and the output diode of the first diode respectively is connected;The source electrode of described first metal-oxide-semiconductor anode with negative electrode, one end of the first inductance and the 4th diode of the 3rd diode respectively is connected;The negative electrode of described 4th diode is connected with the negative electrode of the 5th diode and one end of the second inductance respectively;The other end of described first inductance is connected with the anode of the 5th diode and the anode of the 6th diode respectively;The anode of described first diode negative electrode with the other end, the drain electrode of the second metal-oxide-semiconductor, the positive pole of the second electric capacity and the 6th diode of the second inductance respectively is connected;The negative pole of described second electric capacity one end with the anode of the second diode, the negative pole of output filter capacitor and load respectively is connected;The negative electrode of described output diode is connected with the positive pole of output filter capacitor and the other end of load respectively;The negative pole of described voltage source is connected with source electrode, the negative electrode of the second diode of the second metal-oxide-semiconductor respectively.
Fig. 2 a, Fig. 2 b give the process chart of circuit of the present invention.Fig. 2 a, Fig. 2 b correspondence respectively is the first metal-oxide-semiconductor S1With the second metal-oxide-semiconductor S2Simultaneously turn on and simultaneously turn off the equivalent circuit diagram of period.Having the part that electric current flows through during solid line represents changer in figure, dotted line represents the part that in changer, no current flows through.
The work process of the present invention is as follows:
Stage 1, such as Fig. 2 a: the first metal-oxide-semiconductor S1With the second metal-oxide-semiconductor S2Simultaneously turn on, now the first diode D1, the second diode D2, the 3rd diode D3With the 5th diode D5It is turned off, the 4th diode D4, the 6th diode D6Conducting.Circuit defines two loops, respectively: voltage source ViWith the first electric capacity C1With the second electric capacity C2Give output filter capacitor C togetherfWith load RLCharging, forms loop;Voltage source ViWith the first electric capacity C1To the first inductance L in parallel1With the second inductance L2It is charged energy storage, forms loop.
Stage 2, such as Fig. 2 the b: the first metal-oxide-semiconductor S1With the second metal-oxide-semiconductor S2Simultaneously turn off, now the first diode D1, the second diode D2, the 3rd diode D3With the 5th diode D5It is both turned on, the 4th diode D4, the 6th diode D6With output diode DoTurn off.Circuit defines three loops, respectively: voltage source ViWith the first inductance L1With the second inductance L2Give the second electric capacity C together2Charging energy-storing, forms loop;First inductance L1With the second inductance L2Together to the first electric capacity C after series connection1Charging, forms loop;Output filter capacitor CfGive load RLPower supply, forms loop.
To sum up situation, due to the first metal-oxide-semiconductor S1With the second metal-oxide-semiconductor S2Switch triggering pulse identical, if switching tube S1And S2Dutycycle be D, switch periods is Ts.And set VL1And VL2It is respectively the first inductance L1With the second inductance L2The voltage at two ends, VC1、VC2It is respectively the first electric capacity C1With the second electric capacity C2Voltage, VS1For and VS2It is respectively the first metal-oxide-semiconductor S1With the second metal-oxide-semiconductor S2Voltage between drain electrode and source electrode.Switch periods TsIn, making output voltage is Vo.After changer enters steady operation, draw following voltage relationship derivation.
Operation mode 1: the first metal-oxide-semiconductor S1With the second metal-oxide-semiconductor S2Simultaneously turn on, shown in corresponding equivalent circuit diagram 2a, therefore have an equation below:
VL1on=VL2on=Vi+VC1 (1)
VO=Vi+VC1+VC2 (2)
VS1=VS2=0 (3) metal-oxide-semiconductor S1And S2ON time be DTs
Operation mode 2: the first metal-oxide-semiconductor S1With the second metal-oxide-semiconductor S2Being turned off, corresponding equivalent circuit as shown in Figure 2 b, therefore has an equation below:
VL1-off+VL2-off=-VC1
(4)
VL1-off+VL2-off=Vi-VC2 (5)
VS2=VC2 (6)
VS1=VC1 (7)
Metal-oxide-semiconductor S1And S2Turn-off time be (1-D) Ts
Analyze according to above, the first inductance L1 and the second inductance L2 use inductance Flux consumption conservation principle, simultaneous formula (1), formula (4), formula (5) can obtain respectively:
D(Vi+VC1)-(1-D)(VC1+VL2-off)=0 (8)
D(Vi+VC1)-(1-D)(VC1+VL1-off)=0 (9) simultaneous formula (8) and formula (9) can be tried to achieve:
V L 1 _ o f f = V L 2 _ o f f = - V C 1 2 - - - ( 10 )
Thus, simultaneous formula (8), formula (9) and formula (10) can draw the first electric capacity C1Voltage VC1, the second electric capacity C2Voltage VC2With voltage source ViBetween relational expression be:
V C 1 = 2 D 1 - 3 D V i - - - ( 11 )
V C 2 = 1 - D 1 - 3 D V i - - - ( 12 )
Then by formula (2), formula (11) and formula (12), the output voltage V of circuit of the present invention can be obtainedoExpression formula is:
V o = 2 ( 1 - D ) 1 - 3 D V i - - - ( 13 )
The expression formula of the output voltage gain of circuit the most of the present invention is:
G = V o V i = 2 ( 1 - D ) 1 - 3 D - - - ( 14 )
It is illustrated in figure 3 gain curve and Boost, switching capacity Boost, traditional Z source DC-DC converter and the gain curve comparison diagram of novel quasi-Z source DC-DC converter of circuit of the present invention, figure includes the gain curve of circuit of the present invention, the gain curve of novel quasi-Z source DC-DC converter, the gain curve of traditional Z source DC-DC converter, the gain curve of switching capacity Boost, and the gain curve of Boost.As seen from the figure, circuit of the present invention is in the case of dutycycle D is less than 0.33, and gain G just can reach very big, and dutycycle D of circuit of the present invention is not over 0.33.Therefore, by contrast, the gain of circuit of the present invention is the highest.
In sum, circuit overall structure of the present invention is simple, easy to control, combine the characteristic of quasi-boost switching unit single-stage buck and switched inductors and switching capacity charges the characteristic of discharged in series parallel, achieve the further lifting of output voltage gain, and there is not inrush current and metal-oxide-semiconductor opens the dash current of moment.
Above-described embodiment is the present invention preferably embodiment; but embodiments of the present invention are also not restricted by the embodiments; the change made under other any spirit without departing from the present invention and principle, modify, substitute, combine, simplify; all should be the substitute mode of equivalence, within being included in protection scope of the present invention.

Claims (3)

1.一种开关电感型准开关升压DC-DC变换器电路,其特征在于包括电压源(Vi)、开关电感单元、准开关升压单元、第二MOS管(S2)、第二电容(C2)第二二极管(D2)、输出二极管(Do)、输出滤波电容(Cf)和负载(RL);所述开关电感单元由第一电感(L1)、第二电感(L2)、第四二极管(D4)、第五二极管(D5)、第六二极管(D6)构成;所述准开关升压单元由第一二极管(D1)、第一电容(C1)、第一MOS管(S1)、第三二极管(D3)和前面所述的开关电感单元构成。 1. A switched inductance type quasi-switch boost DC-DC converter circuit, characterized in that it includes a voltage source (V i ), a switched inductance unit, a quasi-switch boost unit, a second MOS tube (S 2 ), a second Capacitor (C 2 ), second diode (D 2 ), output diode (D o ), output filter capacitor (C f ) and load (R L ); the switch inductance unit consists of first inductor (L 1 ), The second inductor (L 2 ), the fourth diode (D 4 ), the fifth diode (D 5 ), and the sixth diode (D 6 ); the quasi-switching boost unit consists of the first two Pole transistor (D 1 ), first capacitor (C 1 ), first MOS transistor (S 1 ), third diode (D 3 ) and the aforementioned switching inductance unit. 2.根据权利要求1所述的一种开关电感型准开关升压DC-DC变换器电路,其特征在于所述电压源(Vi)的正极分别与第一电容(C1)的负极和第三二极管(D3)的阳极连接;所述第一电容(C1)的正极分别与第一二极管(D1)的阴极、第一MOS管(S1)的漏极和输出二极管(Do)的阳极连接;所述第一MOS管(S1)的源极分别与第三二极管(D3)的阴极、第一电感(L1)的一端和第四二极管(D4)的阳极连接;所述第四二极管(D4)的阴极分别与第五二极管(D5)的阴极和第二电感(L2)的一端连接;所述第一电感(L1)的另一端分别与第五二极管(D5)的阳极和第六二极管(D6)的阳极连接;所述第一二极管(D1)的阳极分别与第二电感(L2)的另一端、第二MOS管(S2)的漏极、第二电容(C2)的正极和第六二极管(D6)的阴极连接;所述第二电容(C2)的负极分别与第二二极管(D2)的阳极、输出滤波电容(Cf)的负极和负载(RL)的一端连接;所述输出二极管(Do)的阴极分别与输出滤波电容(Cf)的正极和负载(RL)的另一端连接;所述电压源(Vi)的负极分别与第二MOS管(S2)的源极、第二二极管(D2)的阴极连接。 2. A switched inductance type quasi-switching step-up DC-DC converter circuit according to claim 1, characterized in that the positive pole of the voltage source (V i ) is connected to the negative pole of the first capacitor (C 1 ) and The anode of the third diode (D 3 ) is connected; the anode of the first capacitor (C 1 ) is respectively connected to the cathode of the first diode (D 1 ), the drain of the first MOS transistor (S 1 ) and The anode of the output diode (D o ) is connected; the source of the first MOS transistor (S 1 ) is connected to the cathode of the third diode (D 3 ), one end of the first inductor (L 1 ) and the fourth two The anode of the diode (D 4 ) is connected; the cathode of the fourth diode (D 4 ) is respectively connected with the cathode of the fifth diode (D 5 ) and one end of the second inductor (L 2 ); the The other end of the first inductor (L 1 ) is respectively connected to the anode of the fifth diode (D 5 ) and the anode of the sixth diode (D 6 ); the anode of the first diode (D 1 ) respectively connected to the other end of the second inductor (L 2 ), the drain of the second MOS transistor (S 2 ), the anode of the second capacitor (C 2 ) and the cathode of the sixth diode (D 6 ); The cathode of the second capacitor (C 2 ) is respectively connected to the anode of the second diode (D 2 ), the cathode of the output filter capacitor (C f ) and one end of the load ( RL ); the output diode (D o ) The cathode of the output filter capacitor (C f ) and the other end of the load ( RL ) are respectively connected; the negative electrode of the voltage source (V i ) is respectively connected to the source of the second MOS tube (S 2 ), the second Cathode connection of diode (D 2 ). 3.根据权利要求1所述的一种开关电感型准开关升压DC-DC变换器电路,其特征在于当第一MOS管(S1)和第二MOS管(S2)同时导通时,所述第一二极管(D1)、第二二极管(D2)、第三二极管(D3)和第五二极管(D5)均关断,第四二极管(D4)和第六二极管(D6)导通,电压源(Vi)和第一电容(C1)给并联的第一电感(L1)和第二电感(L2)同时充电;同时,电压源(Vi)与第一电容(C1)和第二电容(C2)一起对输出滤波电容(Cf)和负载(RL)供电;当第一MOS管(S1)和第二MOS管(S2)同时关断时,所述第一二极管(D1)、第二二极管(D2)、第三二极管(D3)和第五二极管(D5)均导通,第四二极管(D4)和第六二极管(D6)关断,输出二极管(Do)关断;所述第一电感(L1)和第二电感(L2)串联后与第一电容(C1)并联,形成回路;所述电压源(Vi)、第一电感(L1)和第二电感(L2)给第二电容(C2)充电;同时,输出滤波电容(Cf)给负载(RL)供电。 3. A switch inductance type quasi-switch step-up DC-DC converter circuit according to claim 1, characterized in that when the first MOS transistor (S 1 ) and the second MOS transistor (S 2 ) are turned on at the same time , the first diode (D 1 ), the second diode (D 2 ), the third diode (D 3 ) and the fifth diode (D 5 ) are all off, the fourth diode The tube (D 4 ) and the sixth diode (D 6 ) conduct, the voltage source (V i ) and the first capacitor (C 1 ) give the parallel connection of the first inductor (L 1 ) and the second inductor (L 2 ) At the same time, the voltage source (V i ) supplies power to the output filter capacitor (C f ) and the load (R L ) together with the first capacitor (C 1 ) and the second capacitor (C 2 ); when the first MOS tube ( When S 1 ) and the second MOS transistor (S 2 ) are turned off at the same time, the first diode (D 1 ), the second diode (D 2 ), the third diode (D 3 ) and the The five diodes (D 5 ) are all turned on, the fourth diode (D 4 ) and the sixth diode (D 6 ) are turned off, and the output diode (D o ) is turned off; the first inductor (L 1 ) and the second inductance (L 2 ) are connected in parallel with the first capacitor (C 1 ) in series to form a loop; the voltage source (V i ), the first inductance (L 1 ) and the second inductance (L 2 ) give The second capacitor (C 2 ) is charged; at the same time, the output filter capacitor (C f ) supplies power to the load ( RL ).
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CN108429454A (en) * 2018-03-13 2018-08-21 广东工业大学 A Two-Switch DC-DC Converter
CN109510462A (en) * 2018-11-12 2019-03-22 浙江工业大学 Step-up dc-dc converter
CN110829842A (en) * 2019-11-18 2020-02-21 哈尔滨理工大学 High-gain DC-DC converter of fuel cell for automobile
CN113179015A (en) * 2021-05-12 2021-07-27 西安石油大学 High-gain DC-DC converter based on Z boost structure
CN113258772A (en) * 2021-05-11 2021-08-13 西安科技大学 Secondary buck-boost converter adopting switch inductor
CN116780898A (en) * 2023-08-14 2023-09-19 深圳市恒运昌真空技术有限公司 High-gain Cuk converter and control method thereof

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