CN114172374B - Cross flying capacitor hybrid boost-buck DC-DC converter based on double inductors - Google Patents
Cross flying capacitor hybrid boost-buck DC-DC converter based on double inductors Download PDFInfo
- Publication number
- CN114172374B CN114172374B CN202111562933.6A CN202111562933A CN114172374B CN 114172374 B CN114172374 B CN 114172374B CN 202111562933 A CN202111562933 A CN 202111562933A CN 114172374 B CN114172374 B CN 114172374B
- Authority
- CN
- China
- Prior art keywords
- state
- flying capacitor
- substrate
- converter
- inductor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- H02M3/10—Conversion 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
- H02M3/145—Conversion 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
- H02M3/155—Conversion 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
- H02M3/156—Conversion 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 with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion 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 with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1582—Buck-boost converters
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention discloses a crossed flying capacitor hybrid buck-boost DC-DC converter based on double inductors, which comprises six switching devices S 1 ‑S 6 Inductance L 1 、L 2 Flying capacitor C F1 、C F2 ；S 1 ‑S 6 Are respectively connected with a control signal S 1 Source electrode of (2) is connected with an inductor L 1 One terminal of (C), flying capacitor C F1 Upper electrode plate and S 3 Drain of (2), S 1 Is connected with the voltage output end V out ；S 2 Source electrode of (2) is connected with an inductor L 2 One terminal of (C), flying capacitor C F2 Upper electrode plate and S 4 Of the drain electrode, S 2 Is connected with the voltage output end V out ，S 1 、S 2 A substrate selection circuit is arranged on the substrate; s 3 Source electrode of the capacitor C is connected with a flying capacitor C F2 Lower plate of (1) and (S) 6 Of the drain electrode, S 3 The substrate is connected with the source electrode of the substrate; s 4 Source electrode of the capacitor C is connected with a flying capacitor C F1 Lower plate of (1) and (S) 5 Of the drain electrode, S 4 The substrate is connected with the source electrode of the substrate; s 5 Is grounded, S 5 The substrate of (1) is connected to ground; s 6 Is connected to ground, S 6 Is connected to the drain of S 3 Source and flying capacitor C F2 Lower pole plate of S 6 The substrate of (1) is connected to ground; inductor L 1 Inductor L 2 The other ends of the two ends of the three-phase transformer are connected with a voltage input end V in 。
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a double-inductor-based cross flying capacitor hybrid buck-boost DC-DC converter.
Background
In recent years, with the increase of high performance mobile device usage, a Power Management Integrated Circuit (PMIC) with high efficiency is becoming a focus of attention, and in order to maintain high efficiency of a mobile device in a wide battery voltage range, a hybrid boost-buck DC-DC (direct current-direct current) converter is becoming a hot spot of research. Due to market demand for high performance mobile devices, now in-chipCurrent consumption (I) Load ) Becoming quite serious, due to the many high performance load modules required in mobile devices, to meet these high performance demands, power management integrated circuits should be able to support large load currents (I |) Load ) I.e. a heavy load condition. The efficiency degradation of the DC-DC converter when under heavy load is mainly due to conduction losses, including the conduction losses of the switching devices and the conduction losses of the inductor. Although the traditional step-up and step-down DC-DC converter can realize the functions of step-up and step-down, the traditional step-up and step-down DC-DC converter has the problems of large inductive current, discontinuous input and output currents, low efficiency and the like.
Like this scheme, there are provided a Fast-response step-up/down converter (FUDC) hybrid buck-boost converter proposed by Min-wo Ko and a hybrid-buck-boost converter (FCBB) hybrid buck-boost converter proposed by Yong-Min Ju, which realize a hybrid buck-boost DC-DC converter. The switch capacitor type converter and the inductor type converter are combined together, and a novel mixed capacitor inductor type DC-DC converter is designed, so that the inductor current is reduced, and the efficiency is improved.
However, they have the following problems:
(1) the improvement effect of the inductive current and the conduction loss is not obvious, and the efficiency is still to be improved.
(2) Compared with the traditional buck-boost converter, the synchronous reduction of the inductive current in the boost mode and the buck mode cannot be realized;
(3) the capacitance current is highly sensitive to the duty ratio D, and as the duty ratio approaches the limit, the capacitance current is ultrahigh, and the efficiency is reduced while the device is damaged.
Disclosure of Invention
The invention aims to provide a double-inductor-based crossed flying capacitor hybrid buck-boost DC-DC converter, which is used for solving the problems that in the prior art, capacitor current is highly sensitive to a duty ratio D, inductor current is not reduced obviously, conduction loss is high, efficiency needs to be improved and the like.
In order to realize the task, the invention adopts the following technical scheme:
cross flying capacitor based on double inductorsA hybrid buck-boost DC-DC converter includes six switching devices S 1 -S 6 Two inductors L 1 、L 2 Two flying capacitors C F1 、C F2 Wherein:
S 1 is connected to the control signal phi S1 Source electrode connected to inductor L 1 One terminal of (C), flying capacitor C F1 Upper electrode plate and S 3 Of the drain electrode, S 1 Is connected with the voltage output end V out ，S 1 A substrate selection circuit is arranged on the substrate; s 2 Is connected to the control signal phi S2 ，S 2 Source electrode of (2) is connected with an inductor L 2 One terminal of (C), flying capacitor C F2 Upper electrode plate and S 4 Of the drain electrode, S 2 Is connected with the voltage output end V out ，S 2 A substrate selection circuit is arranged on the substrate; s 3 Is connected to the control signal phi S3 ，S 3 Source electrode of the capacitor C is connected with a flying capacitor C F2 Lower plate of (1) and (S) 6 Of the drain electrode, S 3 The substrate is connected with the source electrode of the substrate; s 4 Is connected to the control signal phi S4 ，S 4 Source electrode of the capacitor C is connected with a flying capacitor C F1 Lower plate of (1) and (S) 5 Of the drain electrode, S 4 The substrate is connected with the source electrode of the substrate; s 5 Is connected to the control signal phi S5 ，S 5 Is grounded, S 5 The substrate of (1) is connected to ground; s. the 6 Is connected to the control signal phi S6 ，S 6 Is connected to ground, S 6 Is connected to the drain of S 3 Source and flying capacitor C F2 Upper pole plate of S 6 The substrate of (1) is connected to ground; inductor L 1 Inductor L 2 The other ends of the two ends of the three-phase transformer are connected with a voltage input end V in 。
Further, the switching device S 1 -S 4 Being a dnw NMOS-type device, a switching device S 1 And S 2 With substrate selection circuitry; s 5 -S 6 Is a standard NMOS type device.
Further, when the input voltage V of the input terminal in Less than the output voltage V of the output terminal out And then, entering a boosting mode:
in boost mode, the converter operates according to state one, the duty ratio of state one is set to D, and at this time, the switching device S 1 、S 4 And S 6 Conduction, S 2 、S 3 And S 5 Cut-off, flying capacitor C F2 By an inductance L 2 Is charged to
Flying capacitor C F1 Discharge and inductance L 1 Together supply power to the load; after the state is finished, the converter works according to the second state, the duty ratio of the second state is (1-2D), and the switching device S at the moment 1 And S 2 Conduction, S 3 、S 4 、S 5 And S 6 Cutting off; after the second state is finished, the circuit works according to the third state, the duty ratio of the third state is D, and at the moment, the switching device S 2 、S 3 And S 5 Conduction, S 1 、S 4 And S 6 Cut-off, flying capacitor C F1 By an inductance L 1 Is charged to
Flying capacitor C F2 Discharge and inductance L 2 Together supply power to the load; and after the third state is finished, the converter works again according to the first state of the boosting mode.
Further, in the boost mode, T is the time of one switching period, and the duty ratio D is defined as the ratio of the on-time of the switch to the switching period; state one has a duration DT over a period T, when the control signal Φ is S1 、Φ S4 、Φ S6 At a high level, phi S2 、Φ S3 、Φ S5 For low level, the switching devices S are controlled separately 1 、S 4 、S 6 Conduction, S 2 、S 3 、S 5 Cutting off; the duration of state two in one period T is (1-2D) T, when the control signal phi S1 、Φ S2 At a high level, phi S3 -Φ S6 At a low level, the switching device S is controlled 1 、S 2 Conduction, S 3 -S 6 Cutting off; status of stateThe duration of three is DT in a period T, at which time the control signal phi S2 、Φ S3 、Φ S5 At a high level, phi S1 、Φ S4 、Φ S6 For low level, the switching devices S are controlled separately 2 、S 3 、S 5 Conduction, S 1 、S 4 、S 6 And (6) cutting off.
Further, when the input voltage V is applied in Greater than the output voltage V out And (3) entering a voltage reduction mode:
in the buck mode, the converter operates according to a first state with a duty cycle of D, at which time the switch S is turned on 2 、S 4 And S 6 Conduction, S 1 、S 3 And S 5 Cut-off, flying capacitor C F1 By an inductance L 1 Charging to V out Flying capacitor C F2 Discharge and inductance L 1 、L 2 Together supply power to the load; after the state is finished, the circuit works according to the second state, the duty ratio of the second state is (1-2D), and at the moment, the switch S 1 And S 2 Conduction, S 3 、S 4 、S 5 And S 6 Cutting off; after the second state is finished, the circuit works according to the third state, the duty ratio of the third state is D, and at the moment, the switch S 1 、S 3 And S 5 Conduction, S 2 、S 4 And S 6 Cut-off, flying capacitor C F2 By an inductance L 2 Charging to V out Flying capacitor C F1 Discharge and inductance L 1 、L 2 Together supply power to the load; after the third state is finished, the converter works according to the first state of the voltage reduction mode again.
Further, in the buck mode, T is the time of one switching period, and the duty ratio D is defined as the ratio of the on-time of the switch to the switching period; state one has a duration DT over a period T, when the control signal Φ is S2 、Φ S4 、Φ S6 At a high level, phi S1 、Φ S3 、Φ S5 For low level, the switching devices S are controlled separately 2 、S 4 、S 6 Conduction, S 1 、S 3 、S 5 Cutting off; form ofThe duration of state two in one period T is (1-2D) T, when the control signal phi S1 、Φ S2 At a high level, phi S3 -Φ S6 At a low level, the switching device S is controlled 1 、S 2 Conduction, S 3 -S 6 Cutting off; the duration of state three in one period T is DT, when the control signal phi S1 、Φ S3 、Φ S5 At a high level, phi S2 、Φ S4 、Φ S6 For low level, the switching devices S are controlled separately 1 、S 3 、S 5 Conduction, S 2 、S 4 、S 6 And (6) cutting off.
Compared with the prior art, the invention has the following technical characteristics:
1. the cross flying capacitor hybrid buck-boost DC-DC converter structure based on the double inductors is provided, and stable boost and buck functions can be realized in a mobile device PMIC.
2. Continuous input and output current is ensured through the two inductors and the alternate working state, so that switching noise is reduced, current and voltage ripples are reduced, and efficiency is improved.
3. The capacitor current is balanced through three-phase operation, the device safety is protected, and the efficiency is improved.
4. The current is shunted through the two inductors, so that the inductive current is reduced, the conduction loss is greatly reduced, the conduction loss of the switch device and the conduction loss of the inductors are included, and the efficiency is improved.
Drawings
Fig. 1 is a circuit diagram of a dual-inductor-based cross flying capacitor hybrid buck-boost DC-DC converter according to the present invention;
FIGS. 2 (a), (b) and (c) are schematic views illustrating the operation of the present invention in the boost mode;
FIG. 3 is a timing diagram illustrating the control of the switching devices in boost mode according to the present invention;
FIGS. 4 (a), (b) and (c) are schematic views showing the operation state of the present invention in the buck mode;
FIG. 5 is a timing diagram illustrating the control of the switching devices in the buck mode of the present invention;
FIG. 6 is a schematic diagram of the continuous input current and output current of the present invention;
FIGS. 7 (a), (b) and (c) are schematic diagrams of three-phase operation of the present invention with balancing of capacitor currents;
FIGS. 8 (a) and (b) are comparative diagrams of conduction losses in buck mode and boost mode according to the present invention;
FIG. 9 is a graph of a simulation of power stage efficiency at an input of 2.5V, an output of 2V, and a conversion ratio M of 0.8 in accordance with an embodiment of the present invention;
fig. 10 is a simulation graph of power stage efficiency at an input of 2.5V, an output of 3V, and a conversion ratio M of 1.2 according to an embodiment of the present invention.
Detailed Description
The invention provides a double-inductor-based cross flying capacitor hybrid buck-boost DC-DC converter, which ensures continuous input current and output current through double inductors and three-phase operation, reduces current and voltage ripples, balances capacitor current and reduces loss caused by overhigh capacitor current; the conduction loss is improved through the reduction of the inductance current and the capacitance current, so that the loading capacity of the DC-DC converter is improved, and the efficiency of the converter is improved.
Referring to fig. 1, the converter structure of the present invention includes six switching devices S 1 -S 6 Two inductors L 1 、L 2 Two flying capacitors C F1 、C F2 ；C Load Is a load capacitance, R Load Is a load resistance of phi S1 -Φ S6 Are switching devices S respectively 1 -S 6 BS in the figure denotes a substrate selection circuit. Switching device S 1 -S 4 Is a 5Vdnw NMOS type device, a switching device S 1 And S 2 With substrate selection circuitry; s 5 -S 6 Is a standard 5V NMOS type device.
Wherein S is 1 Is connected to the control signal phi S1 Source electrode connected to inductor L 1 One terminal of (C), flying capacitor C F1 Upper electrode plate and S 3 Of the drain electrode, S 1 Is connected with the voltage output end V out ，S 1 Is provided withA substrate selection circuit; s 2 Is connected to the control signal phi S2 ，S 2 Source electrode of (2) is connected with an inductor L 2 One terminal of (C), flying capacitor C F2 Upper electrode plate and S 4 Of the drain electrode, S 2 Is connected with the voltage output end V out ，S 2 A substrate selection circuit is arranged on the substrate; s 3 Is connected to the control signal phi S3 ，S 3 Source electrode of the capacitor C is connected with a flying capacitor C F2 Lower plate of (1) and (S) 6 Of the drain electrode, S 3 The substrate is connected with the source electrode of the substrate; s 4 Is connected to the control signal phi S4 ，S 4 Source electrode of the capacitor C is connected with a flying capacitor C F1 Lower plate of (1) and (S) 5 Of the drain electrode, S 4 The substrate is connected with the source electrode of the substrate; s 5 Is connected to the control signal phi S5 ，S 5 Is grounded, S 5 The substrate of (1) is connected to ground; s 6 Is connected to the control signal phi S6 ，S 6 Is connected to ground, S 6 Is connected to S 3 Source and flying capacitor C F2 Upper pole plate of S 6 The substrate of (1) is connected to ground; inductor L 1 Inductor L 2 The other ends of the two ends of the three-phase transformer are connected with a voltage input end V in 。
The working process of the hybrid buck-boost DC-DC converter provided by the invention is divided into a boost mode and a buck mode, and the working states are respectively shown in fig. 2 and fig. 4.
When the input voltage V of the input terminal in Less than the output voltage V of the output terminal out And then entering a boosting mode:
in boost mode, the converter operates according to state one, the duty ratio of state one is set to D, and at this time, the switching device S 1 、S 4 And S 6 Conduction, S 2 、S 3 And S 5 Cut-off, flying capacitor C F2 By an inductance L 2 Is charged to
Flying capacitor C F1 Discharge and inductance L 1 Together supply power to the load; after the state is finished, the converter works according to the second state,the duty cycle of state two is (1-2D), at which time the switching device S 1 And S 2 Conduction, S 3 、S 4 、S 5 And S 6 Cutting off; after the second state is finished, the circuit works according to the third state, the duty ratio of the third state is D, and at the moment, the switching device S 2 、S 3 And S 5 Conduction, S 1 、S 4 And S 6 Cut-off, flying capacitor C F1 By an inductance L 1 Is charged to
Flying capacitor C F2 Discharge and inductance L 2 Together supply power to the load; and after the third state is finished, the converter works again according to the first state of the boosting mode.
According to the principle of inductive volt-second balance, the conversion ratio M in the boost mode can be calculated as follows:
flying capacitor C F1 、C F2 And a load capacitor C of the output terminal Load The law of conservation of charge can obtain the inductance L 1 、L 2 Upper inductor current I L1 、I L2 And flying capacitor C F1 、C F2 On the capacitor current I C1 、I C2 Comprises the following steps:
conduction loss P cond Can be calculated as:
wherein R is on Is the on-resistance of the switching device, R DCR Is parasitic direct current resistance on the inductor, I Load Is the load current.
As shown in fig. 3, which is a control timing diagram of the switching device in the boost mode, T is a time of one switching period, and the duty ratio D is defined as a ratio of the on-time of the switch to the switching period. State one has a duration DT over a period T, when the control signal Φ is S1 、Φ S4 、Φ S6 At a high level, phi S2 、Φ S3 、Φ S5 For low level, the switching devices S are controlled separately 1 、S 4 、S 6 Conduction, S 2 、S 3 、S 5 Cutting off; the duration of state two in one period T is (1-2D) T, when the control signal phi S1 、Φ S2 At a high level, phi S3 -Φ S6 At a low level, the switching device S is controlled 1 、S 2 Conduction, S 3 -S 6 Cutting off; the duration of state three in one period T is DT, when the control signal phi S2 、Φ S3 、Φ S5 At a high level, phi S1 、Φ S4 、Φ S6 For low level, the switching devices S are controlled separately 2 、S 3 、S 5 Conduction, S 1 、S 4 、S 6 And (6) cutting off.
When the input voltage V in Greater than the output voltage V out And (3) entering a voltage reduction mode:
in the buck mode, the converter operates according to a first state with a duty cycle of D, at which time the switch S is turned on 2 、S 4 And S 6 Conduction, S 1 、S 3 And S 5 Cut-off, flying capacitor C F1 By an inductance L 1 Charging to V out Flying capacitor C F2 Discharge and inductance L 1 、L 2 Together supply power to the load; after the state is finished, the circuit works according to the second state, the duty ratio of the second state is (1-2D), and at the moment, the switch S 1 And S 2 Conduction, S 3 、S 4 、S 5 And S 6 Cutting off; after the second state, the circuit is according toWorking in the third state, the duty ratio of the third state is D, and at the moment, the switch S 1 、S 3 And S 5 Conduction, S 2 、S 4 And S 6 Cut-off, flying capacitor C F2 By an inductance L 2 Charging to V out Flying capacitor C F1 Discharge and inductance L 1 、L 2 Together supply power to the load; and after the third state is finished, the converter works again according to the first state in the voltage reduction mode.
According to the principle of the inductive volt-second balance, the conversion ratio M in the voltage reduction mode can be calculated as follows:
flying capacitor C F1 、C F2 And a load capacitor C of the output terminal Load The law of conservation of charge can obtain the inductance L 1 、L 2 Upper inductor current I L1 、I L2 And flying capacitor C F1 、C F2 On the capacitor current I C1 、I C2 Comprises the following steps:
the conduction loss can be calculated as:
wherein R is on Is the on-resistance of the switching device, R DCR Is parasitic direct current resistance on the inductor, I Load Is the load current.
As shown in FIG. 5, a timing diagram of the control of the switching device in buck mode, T is the time of one switching period, and the duty cycle D is defined as the switchingRatio of on-time to switching period. State one has a duration DT over a period T, when the control signal Φ is S2 、Φ S4 、Φ S6 At a high level, phi S1 、Φ S3 、Φ S5 For low level, the switching devices S are controlled separately 2 、S 4 、S 6 Conduction, S 1 、S 3 、S 5 Cutting off; the duration of state two in one period T is (1-2D) T, when the control signal phi S1 、Φ S2 At a high level, phi S3 -Φ S6 At a low level, the switching device S is controlled 1 、S 2 Conduction, S 3 -S 6 Cutting off; the duration of state three in one period T is DT, when the control signal phi S1 、Φ S3 、Φ S5 At a high level, phi S2 、Φ S4 、Φ S6 For low level, the switching devices S are controlled separately 1 、S 3 、S 5 Conduction, S 2 、S 4 、S 6 And (6) cutting off.
The invention ensures continuous input current and output current through two inductors and the alternate working state, as shown in figure 6, thereby reducing current and voltage ripple and improving efficiency.
According to the invention, the capacitor current is balanced through three-phase operation, the average current and the current ripple are reduced, the capacitor current is equal in magnitude and opposite in direction in the first state and the third state, the condition of ultrahigh capacitor current cannot occur, the device safety is protected, and the efficiency is improved, as shown in fig. 7.
Benefiting from the reduction of the inductive current and the capacitive current, the conduction loss is greatly reduced, the conduction loss can be normalized and compared according to the formulas (4) and (8), as shown in fig. 8, the scheme greatly reduces the conduction loss and improves the efficiency.
FIG. 9 is a simulation graph of power stage efficiency at 2.5V input, 2V output, and a conversion ratio M of 0.8 according to the present invention; FIG. 10 is a simulation graph of power stage efficiency at 2.5V input, 3V output, and a conversion ratio M of 1.2 according to the present invention. Switching device S 1 -S 4 Is a 5V dnw NMOS device, S 5 -S 6 The inductor is a standard 5V NMOS device, wherein a single inductance value is 4.7 muH, parasitic resistance is 250m omega, the size of the inductor is considered to be fixed, parasitic resistance of the two inductors is 320m omega, meanwhile, the area of a switch device is considered to be fixed, the on-resistance of a switch device in the traditional scheme is 100m omega, the on-resistance of a FUDC structure switch device is 175m omega, the on-resistance of a FCBB structure switch device is 100m omega, and the on-resistance of the switch device in the scheme is 150m omega.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (4)
1. A cross flying capacitor hybrid buck-boost DC-DC converter based on double inductors is characterized by comprising six switching devices S 1 -S 6 Two inductors L 1 、L 2 Two flying capacitors C F1 、C F2 Wherein:
S 1 is connected to the control signal phi S1 Source electrode connected to inductor L 1 One terminal of (C), flying capacitor C F1 Upper electrode plate and S 3 Of the drain electrode, S 1 Is connected with the voltage output end V out ，S 1 A substrate selection circuit is arranged on the substrate; s. the 2 Is connected to the control signal phi S2 ，S 2 Source electrode of (2) is connected with an inductor L 2 One terminal of (C), flying capacitor C F2 Upper electrode plate and S 4 Of the drain electrode, S 2 Is connected with the voltage output end V out ，S 2 A substrate selection circuit is arranged on the substrate; s 3 Is connected to the control signal phi S3 ，S 3 Source electrode of the capacitor C is connected with a flying capacitor C F2 Lower plate of (1) and (S) 6 Of the drain electrode, S 3 The substrate is connected with a self source electrode; s 4 Is connected to the control signal phi S4 ，S 4 Source electrode of the capacitor C is connected with a flying capacitor C F1 Lower plate of (1) and (S) 5 Drain of (2), S 4 The substrate is connected with the source electrode of the substrate; s 5 Is connected to the control signal phi S5 ，S 5 Is grounded, S 5 The substrate of (1) is connected to ground; s 6 Is connected to the control signal phi S6 ，S 6 Is connected to ground, S 6 The substrate of (1) is connected to ground; inductor L 1 Inductor L 2 The other ends of the two ends of the three-phase transformer are connected with a voltage input end V in 。
2. The dual-inductor based cross-flying capacitor hybrid buck-boost DC-DC converter as claimed in claim 1, wherein the switching device S is 1 -S 4 Being a dnw NMOS-type device, a switching device S 1 And S 2 With substrate selection circuitry; s 5 -S 6 Is a standard NMOS type device.
3. The dual-inductor based cross-flying capacitor hybrid buck-boost DC-DC converter as claimed in claim 1, wherein the input voltage V at the input terminal is in Less than the output voltage V of the output terminal out And then, entering a boosting mode:
in boost mode, the converter is first operated according to state one, which operates during the period 0 to DT of the switching period T, while the switching device S is now operating 1 、S 4 And S 6 Conduction, S 2 、S 3 And S 5 Cut-off, flying capacitor C F2 By an inductance L 2 Is charged to
Flying capacitor C F1 Discharge and inductance L 1 Together supply power to the load; after the end of the state, the converter operates according to state two, which operates during DT (1-D) T of the switching period T, when the switching device S is present 1 And S 2 Conduction, S 3 、S 4 、S 5 And S 6 Cutting off; after the second state is finished, the circuit works according to the third state, the third state works in the period from (1-D) T to DT of the switching period T, and the switching device S works at the moment 2 、S 3 And S 5 Conduction, S 1 、S 4 And S 6 Cut-off, flying capacitor C F1 By an inductance L 1 Is charged to
Flying capacitor C F2 Discharge and inductance L 2 Together supply power to the load; after the third state, the converter works again according to the first state of the boosting mode, wherein D represents S 3 、S 4 、S 5 And S 6 The duty cycle of (c).
4. The dual-inductor based cross-flying capacitor hybrid buck-boost DC-DC converter as claimed in claim 1, wherein when input voltage V is greater than V in Greater than the output voltage V out And (3) entering a voltage reduction mode:
in the buck mode, the converter first operates according to state one, which operates during the period 0 to DT of the switching period T, at which time the switch S is switched on 2 、S 4 And S 6 Conduction, S 1 、S 3 And S 5 Cut-off, flying capacitor C F1 By an inductance L 1 Charging to V out Flying capacitor C F2 Discharge and inductance L 1 、L 2 Together supply power to the load; after the state is over, the circuit operates according to the second state, the second state operates in the DT to (1-D) T period of the switching period T, and the switch S is switched on 1 And S 2 Conduction, S 3 、S 4 、S 5 And S 6 Cutting off; after the second state, the circuit operates according to the third state, the third state operates in the period from (1-D) T to DT of the switching period T, and the switch S is switched on at the moment 1 、S 3 And S 5 Conduction, S 2 、S 4 And S 6 Cut-off, flying capacitor C F2 By an inductance L 2 Charging to V out Flying capacitor C F1 Discharge and inductance L 1 、L 2 Together supply power to the load;after the third state, the converter works again according to the first state of the voltage reduction mode, wherein the duty ratio D represents S 3 、S 4 、S 5 And S 6 The duty cycle of (c).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111562933.6A CN114172374B (en) | 2021-12-20 | 2021-12-20 | Cross flying capacitor hybrid boost-buck DC-DC converter based on double inductors |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111562933.6A CN114172374B (en) | 2021-12-20 | 2021-12-20 | Cross flying capacitor hybrid boost-buck DC-DC converter based on double inductors |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114172374A CN114172374A (en) | 2022-03-11 |
| CN114172374B true CN114172374B (en) | 2022-08-09 |
Family
ID=80487528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111562933.6A Active CN114172374B (en) | 2021-12-20 | 2021-12-20 | Cross flying capacitor hybrid boost-buck DC-DC converter based on double inductors |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114172374B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114785114B (en) * | 2022-05-26 | 2023-04-28 | 电子科技大学 | Mixed mode biphase power converter with high voltage transformation ratio |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008022695A (en) * | 2006-06-16 | 2008-01-31 | Fujitsu Ltd | Step-up/down dc-dc converter, control circuit therefor, and control method therefor |
| CN107733222A (en) * | 2017-11-03 | 2018-02-23 | 盐城工学院 | Wide gain ranging DC voltage buck translation circuit |
| CN211405866U (en) * | 2019-11-23 | 2020-09-01 | 上海交通大学 | Buck-boost direct current conversion circuit |
| CN113054838A (en) * | 2021-03-31 | 2021-06-29 | 电子科技大学 | Hybrid dual-path buck converter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11456663B2 (en) * | 2020-06-12 | 2022-09-27 | Dialog Semiconductor (Uk) Limited | Power converter with reduced root mean square input current |
-
2021
- 2021-12-20 CN CN202111562933.6A patent/CN114172374B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008022695A (en) * | 2006-06-16 | 2008-01-31 | Fujitsu Ltd | Step-up/down dc-dc converter, control circuit therefor, and control method therefor |
| CN107733222A (en) * | 2017-11-03 | 2018-02-23 | 盐城工学院 | Wide gain ranging DC voltage buck translation circuit |
| CN211405866U (en) * | 2019-11-23 | 2020-09-01 | 上海交通大学 | Buck-boost direct current conversion circuit |
| CN113054838A (en) * | 2021-03-31 | 2021-06-29 | 电子科技大学 | Hybrid dual-path buck converter |
Non-Patent Citations (1)
| Title |
|---|
| Yeunhee Huh等.A Hybrid Dual-Path Step-Down Converter with 96.2% Peak Efficiency using a 250mΩLarge-DCR Inductor.《2018 IEEE Symposium on VLSI Circuits》.2018,第225-226页. * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114172374A (en) | 2022-03-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10790742B1 (en) | Multi-level power converter with improved transient load response | |
| Ismail et al. | A family of single-switch PWM converters with high step-up conversion ratio | |
| TWI403082B (en) | Step-up dc/dc voltage converter with improved transient current capability | |
| US8488340B2 (en) | Power converter with boost-buck-buck configuration utilizing an intermediate power regulating circuit | |
| CN104022640A (en) | DC-DC converter of single inductor output driver based on resonance and method | |
| Baek et al. | 11.7 a voltage-tolerant three-level buck-boost dc-dc converter with continuous transfer current and flying capacitor soft charger achieving 96.8% power efficiency and 0.87 µs/v dvs rate | |
| Fardoun et al. | Bidirectional converter for high-efficiency fuel cell powertrain | |
| US20200328675A1 (en) | Hybrid Converter with Reduced Inductor Loss | |
| Chang et al. | Single-inductor four-switch non-inverting buck-boost dc-dc converter | |
| CN113054838A (en) | Hybrid dual-path buck converter | |
| CN109586572A (en) | Converter and power management integrated circuit system | |
| TWI489754B (en) | Reversible multiple-input interleaving dc-dc converter | |
| Fardoun et al. | Bi-directional converter with low input/output current ripple for renewable energy applications | |
| CN114172374B (en) | Cross flying capacitor hybrid boost-buck DC-DC converter based on double inductors | |
| CN109617407B (en) | Boost type series-parallel full-resonance switch capacitor converter | |
| Kim et al. | Soft-switching step-up converter with ripple-free output current | |
| Chakraborty et al. | Digital combination of buck and boost converters to control a positive buck-boost converter | |
| Takahashi et al. | Single inductor dc-dc converter with bipolar outputs using charge pump | |
| Su et al. | 12.6 90% Peak efficiency single-inductor-multiple-output DC-DC buck converter with output independent gate drive control | |
| Huang et al. | Integrated single-inductor dual-output DC-DC converter with power-distributive control | |
| Cho et al. | A single-mode dual-path buck-boost converter with reduced inductor current across all duty cases achieving 95.58% efficiency at 1A in boost operation | |
| Sun et al. | A novel ripple controlled modulation for high efficiency DC-DC converters | |
| Guo et al. | A multi-modes charge-pump based high efficiency wide input range DC-DC converter | |
| Chi-Wa et al. | Review and comparison of integrated inductive-based hybrid step-down DC-DC converter under CCM operation | |
| TWI411210B (en) | Freewheel charge-pump controlled single-inductor multiple-output dc-dc converter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |