CN111682757B - Non-isolated high-voltage-reduction-gain DC-DC converter - Google Patents
Non-isolated high-voltage-reduction-gain DC-DC converter Download PDFInfo
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- CN111682757B CN111682757B CN202010437292.0A CN202010437292A CN111682757B CN 111682757 B CN111682757 B CN 111682757B CN 202010437292 A CN202010437292 A CN 202010437292A CN 111682757 B CN111682757 B CN 111682757B
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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
- H02M3/10—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
-
- 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
- H02M1/0048—Circuits or arrangements for reducing losses
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- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a non-isolated high-voltage-reduction-gain DC-DC converter for a data center power supply voltage regulation module, wherein the anode of an input power supply is connected with the anode of a first capacitor and one end of a second switch tube through a first switch tube, the cathode of the first capacitor is connected with one end of a third switch tube, one end of a first inductor, one end of a second inductor and one end of a fifth switch tube, the other end of the second switch tube and the other end of the third switch tube are connected with the anode of a second capacitor, the cathode of the second capacitor is connected with one end of a fourth switch tube and the other end of the first inductor, the other end of the second inductor is connected with one end of a load, and the other end of the load, the other end of the fifth switch tube and the other end of the fourth switch tube are connected with the cathode of the input power supply; the first switch tube, the second switch tube, the third switch tube, the fifth switch tube and the fourth switch tube are all active switch tubes, and the converter has the characteristics of small volume, high power density and high efficiency.
Description
Technical Field
The invention relates to a DC-DC converter, in particular to a non-isolated high-step-down gain DC-DC converter for a data center power supply voltage regulating module.
Background
The power electronic technology is an important supporting technology in the fields of national economy and national safety, and is an important technical means for realizing energy conservation and environmental protection and improving the life quality of people. High efficiency and high quality power conversion is an ultimate goal of power electronics technology development. In recent years, step-down dc converters have attracted increasing attention in high output current applications, such as voltage regulation modules for computer central processing unit boards, battery chargers, and distributed power systems. For non-isolated applications requiring low output current ripple, is considered attractive because of its simple structure and low control complexity.
The DC-DC topologies of high buck gain that exist today are mainly divided into two categories:
the isolated high-voltage-reduction-gain DC-DC converter realizes a large transformation ratio based on the transformation ratio of a transformer, and the topology comprises LLC (logic Link control), a flyback circuit and the like;
the non-isolated DC-DC converter with large voltage reduction ratio is based on coupling inductance, switch capacitance, two-stage topology and the like.
Isolated topologies have been commonly used in the current industry, but the power density and volume cannot be made very small due to the presence of transformers, which also limits the development of isolated DC-DC topologies. Non-isolated topologies are a very good candidate in the future and have gained much attention. Therefore, it is desirable to design a DC-DC converter having small size, high power density and high efficiency.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a non-isolated high-buck-gain DC-DC converter for a data center power supply voltage regulating module, which has the characteristics of small volume, high power density and high efficiency.
In order to achieve the above purpose, the non-isolated high step-down gain DC-DC converter for the data center power voltage regulation module according to the present invention includes an input power, a first switching tube, a first capacitor, a second switching tube, a third switching tube, a first inductor, a second inductor, a fifth switching tube, a second capacitor, and a fourth switching tube;
the positive pole of the input power supply is connected with the positive pole of a first capacitor and one end of a second switch tube through a first switch tube, the negative pole of the first capacitor is connected with one end of a third switch tube, one end of a first inductor, one end of a second inductor and one end of a fifth switch tube, the other end of the second switch tube and the other end of the third switch tube are connected with the positive pole of the second capacitor, the negative pole of the second capacitor is connected with one end of a fourth switch tube and the other end of the first inductor, the other end of the second inductor is connected with one end of a load, and the other end of the load, the other end of the fifth switch tube and the other end of the fourth switch tube are connected with the negative pole of the input power supply;
the first switch tube, the second switch tube, the third switch tube, the fifth switch tube and the fourth switch tube are all active switch tubes.
The first switch tube, the second switch tube, the third switch tube, the fourth switch tube and the fifth switch tube are all MOSFET switch tubes.
The load is composed of a load resistor and a load capacitor which are connected in parallel.
The capacitance values of the first capacitor and the second capacitor are the same, and the inductance values of the first inductor and the second inductor are the same.
At t0<t<t1The moment, switch on first switch tube, third switch tube and fourth switch tube, break off second switch tube and fifth switch tube, input power charges for first electric capacity, second inductance and load, and the energy is stored on first electric capacity and second inductance, and first electric capacity discharges simultaneously and gets for second inductance and load according to KVL theorem:
Vin＝VC1+VL2+Vo (1)
Vin＝VC1-VL1 (2)
Vin＝VC1+VC2 (3)
at t1<t<t2And at the moment, the first switching tube and the third switching tube are disconnected, the fourth switching tube and the fifth switching tube are switched on, the first inductor and the second inductor discharge to a load, and the current is obtained according to the KVL theorem:
VL1＝0 (4)
VL2＝-Vo (5)
at t2<t<t3Moment, break off the fourth switch tube, switch on the second switch tube, first inductance and second inductance discharge for the load, obtain according to KVL theorem:
VC1＝VC2+VL1 (6)
VL2＝-Vo (7)
at t3<t<t4At any moment, the first switch tube and the second switchThe states of the transistor, the third switch transistor, the fourth switch transistor and the fifth switch transistor and t1<t<t2And (3) obtaining the following components according to the volt-second balance characteristics of the first inductor and the second inductor at the same time:
D(VC1-Vin)+D(VC1-VC2)＝0 (8)
D(Vin-VC1-Vo)+(1-D)(-Vo)＝0 (9)
according to the equations (8) and (9), the gain M of the DC-DC converter is obtained as:
the invention has the following beneficial effects:
the non-isolated high-voltage-reduction-gain DC-DC converter for the data center power supply voltage regulating module consists of five switching tubes, two capacitors and two inductors during specific operation, compared with the same type of non-isolated DC-DC topology, the number of devices is small, the power density is high, the size is small, active switching tubes are selected, each switching tube has low voltage stress, loss is reduced, the efficiency is high, and meanwhile, two inductor magnetic pieces can be integrated on the basis of the active switching tubes during actual operation, so that the size of the topology is further reduced, and the power density of the topology is increased.
Drawings
FIG. 1 is a topology diagram of the present invention;
FIG. 2 is a current flow diagram of the present invention at state 1;
FIG. 3 is a current flow diagram for the present invention in states 2 and 4;
FIG. 4 is a current flow diagram of the present invention at state 3;
FIG. 5 is a waveform illustrating an exemplary operation of the present invention;
FIG. 6 is a waveform diagram illustrating input and output voltage simulation according to the present invention;
FIG. 7 shows the first switch tube S1A second switch tube S2And a third switch tube S3Voltage stress simulation oscillogram of (1);
FIG. 8 shows a fourth switch tube S4And a fifth switching tube S5Voltage stress simulation oscillogram of (1);
FIG. 9 shows a first capacitor C1And a second capacitor C2Voltage simulation oscillogram of (1);
FIG. 10 shows the first inductor L1And a second inductance L2The current of (2) simulates a waveform diagram.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the non-isolated high step-down gain DC-DC converter for a data center power supply voltage regulation module according to the present invention is characterized by comprising an input power supply VinA first switch tube S1A first capacitor C1A second switch tube S2A third switch tube S3A first inductor L1A second inductor L2The fifth switch tube S5A second capacitor C2And a fourth switching tube S4(ii) a Input power supply VinThe positive pole of the first switch tube S1And a first capacitor C1Positive electrode and second switch tube S2Is connected to a first capacitor C1Negative pole and third switch tube S3One end of (1), the first inductance L1One terminal of (1), a second inductance L2And a fifth switching tube S5Is connected with one end of the second switch tube S2And the other end of the third switch tube S3And the other end of the first capacitor C2Is connected to the positive pole of a second capacitor C2Negative pole and fourth switch tube S4And a first inductor L1Is connected to the other end of the second inductor L2Is connected with one end of a load, the other end of the load and a fifth switch tube S5And the other end of the fourth switch tube S4The other ends of the two ends are connected with an input power supply VinThe negative electrodes are connected; first switch tube S1A second switch tube S2A third switch tube S3The fifth switch tube S5And a fourth switching tube S4All are active switch tubes.
First switch tube S1A second switch tube S2A third switch tube S3And a fourth switching tube S4And a fifth switching tube S5Are all MOSFET switching tubes; the load is composed of load resistors R connected in parallelLAnd a load capacitor Co; a first capacitor C1And a second capacitor C2Have the same capacitance value, the first inductor L1And a second inductance L2The inductance values of (a) and (b) are the same.
The specific working process of the invention is as follows:
referring to FIG. 2, state 1, at t0<t<t1At all times, the first switch tube S is conducted1A third switch tube S3And a fourth switching tube S4Disconnecting the second switch tube S2And a fifth switching tube S5Input power supply VinFor the first capacitor C1A second inductor L2And charging the load, energy being stored in the first capacitor C1And a second inductance L2While the first capacitor C1Discharge to the second inductor L2And a load, obtained according to KVL theorem:
Vin＝VC1+VL2+Vo (1)
Vin＝VC1-VL1 (2)
Vin＝VC1+VC2 (3)
referring to FIG. 3, state 2, at t1<t<t2At all times, the first switch tube S is disconnected1And a third switch tube S3And the fourth switching tube S is conducted4And a fifth switching tube S5First inductance L1And a second inductance L2Discharging to a load, and obtaining according to KVL theorem:
VL1＝0 (4)
VL2＝-Vo (5)
referring to FIG. 4, state 3, at t2<t<t3At the moment, the fourth switching tube S is disconnected4Turn on the second switch tube S2First inductance L1And a second inductance L2Discharging to a load, and obtaining according to KVL theorem:
VC1＝VC2+VL1 (6)
VL2＝-Vo (7)
referring to FIG. 3, state 4, at t3<t<t4At the moment, the first switch tube S1A second switch tube S2A third switch tube S3And a fourth switching tube S4And a fifth switching tube S5State of (1) and t1<t<t2The same time according to the first inductance L1And a second inductance L2The volt-second equilibrium characteristic of (c) is as follows:
D(VC1-Vin)+D(VC1-VC2)＝0 (8)
D(Vin-VC1-Vo)+(1-D)(-Vo)＝0 (9)
according to the equations (8) and (9), the gain M of the DC-DC converter is obtained as:
first switch tube S1A second switch tube S2A third switch tube S3And a fourth switching tube S4And a fifth switching tube S5The voltage resistance of the first switch tube S is selected according to the expressions (8) and (9) by considering the parasitic parameters and voltage peaks on the actual circuit, so that each switch tube is selected to be at least 2 times of the voltage stress born by the tube, and the first switch tube S can be obtained according to the theory1A second switch tube S2A third switch tube S3And a fourth switching tube S4And a fifth switching tube S5The voltage stress borne is reduced along with the increase of the duty ratio as shown in fig. 6, so that the maximum voltage stress borne by each switching tube is considered as a reference;
the capacitor plays a very important role in the energy transfer process, and in order to reduce the loss in the transfer process, the first capacitor C1And a second capacitor C2The ceramic capacitor is selected because the ceramic capacitor has lower series equivalent resistance, and the output filter capacitor is selected from the electrolytic capacitor because the capacitance value of the electrolytic capacitorThe output voltage ripple is reduced more;
the high-frequency integrated inductance core is selected in a topological mode, and the ferrite core is selected as the magnetic core material, and the inductance winding is realized by adopting PC B because ferrite has better magnetic conductivity and lower iron loss compared with an alloy magnetic powder core;
an example of the invented topology is established by MATLAB simulation software, the input voltage is 48V, the output voltage is 1.8V, the duty ratio is 0.1125, and the simulation waveforms of the topology shown in FIGS. 6-10 are consistent with theoretical analysis.
Claims (3)
1. A non-isolated high step-down gain DC-DC converter for a data center power supply voltage regulation module, comprising an input power supply (V)in) A first switch tube (S)1) A first capacitor (C)1) A second switch tube (S)2) And a third switching tube (S)3) A first inductor (L)1) A second inductor (L)2) And a fifth switching tube (S)5) A second capacitor (C)2) And a fourth switching tube (S)4)；
Input power supply (V)in) The positive pole of the first switch tube (S)1) And a first capacitance (C)1) Positive electrode and second switching tube (S)2) Is connected to a first capacitor (C)1) Negative electrode and third switching tube (S)3) One terminal of (1), the first inductance (L)1) One terminal of (a), a second inductance (L)2) And a fifth switching tube (S)5) Is connected to one end of the second switching tube (S)2) And the other end of (S) and a third switching tube (S)3) And the other terminal of (C) and a second capacitor (C)2) Is connected to the positive pole of a second capacitor (C)2) Negative pole and fourth switch tube (S)4) And a first inductor (L)1) Is connected to the other end of the second inductor (L)2) Is connected with one end of a load, the other end of the load and a fifth switch tube (S)5) And the other end of the fourth switching tube (S)4) The other ends of the two ends are connected with an input power supply (V)in) The negative electrodes are connected;
a first switch tube (S)1) A second switch tube (S)2) And a third switching tube (S)3) And a fifth switching tube (S)5) And a fourth switching tube (S)4) All are active switch tubes;
a first capacitor (C)1) And a second capacitance (C)2) Has the same capacitance value as the first inductor (L)1) And a second inductor (L)2) The inductance values of (A) are the same;
at t0<t<t1At any moment, the first switch tube is conducted (S)1) And a third switching tube (S)3) And a fourth switching tube (S)4) And the second switch tube is disconnected (S)2) And a fifth switching tube (S)5) Input power supply (V)in) To the first capacitor (C)1) A second inductor (L)2) And charging the load, energy being stored in the first capacitor (C)1) And a second inductance (L)2) Upper, at the same time, a first capacitance (C)1) Discharging to the second inductor (L)2) And a load, obtained according to KVL theorem:
Vin＝VC1+VL2+Vo (1)
Vin＝VC1-VL1 (2)
Vin＝VC1+VC2 (3)
wherein, VinIs the input voltage;
at t1<t<t2At the moment, the first switch tube is disconnected (S)1) And a third switch tube (S)3) And the fourth switching tube is conducted (S)4) And a fifth switching tube (S)5) First inductance (L)1) And a second inductance (L)2) Discharging to a load, and obtaining according to KVL theorem:
VL1＝0 (4)
VL2＝-Vo (5)
at t2<t<t3At the moment, the fourth switching tube is disconnected (S)4) And the second switch tube is conducted (S)2) First inductance (L)1) And a second inductor (L)2) Discharging to a load, and obtaining according to KVL theorem:
VC1＝VC2+VL1 (6)
VL2＝-Vo (7)
at t3<t<t4At the moment, the first switch tube (S)1) A second switch tube (S)2) And a third switching tube (S)3) And a fourth switching tube (S)4) And a fifth switching tube (S)5) State of (1) and t1<t<t2At the same time according to the first inductance (L)1) And a second inductor (L)2) The volt-second equilibrium characteristic of (c) is as follows:
D(VC1-Vin)+D(VC1-VC2)＝0 (8)
D(Vin-VC1-Vo)+(1-D)(-Vo)＝0 (9)
according to the equations (8) and (9), the gain M of the DC-DC converter is obtained as:
2. the non-isolated high buck gain DC-DC converter for a data center power supply voltage regulator module of claim 1, wherein the first switching transistor (S)1) A second switch tube (S)2) And a third switching tube (S)3) And a fourth switching tube (S)4) And a fifth switching tube (S)5) Are all MOSFET switching tubes.
3. The non-isolated high buck gain DC-DC converter for a data center power supply voltage regulator module of claim 1, wherein the load is comprised of a load resistor (R) connected in parallelL) And a load capacitor (Co).
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| CN113765374B (en) * | 2021-08-30 | 2023-08-22 | 西安交通大学 | Ultrahigh voltage drop type DC-DC converter based on switched capacitor and coupling inductance technology |
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