CN103401419A - Bidirectional double-input BUCK/BUCKBOOST dc converter and power distribution method thereof - Google Patents
Bidirectional double-input BUCK/BUCKBOOST dc converter and power distribution method thereof Download PDFInfo
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- CN103401419A CN103401419A CN2013102484122A CN201310248412A CN103401419A CN 103401419 A CN103401419 A CN 103401419A CN 2013102484122 A CN2013102484122 A CN 2013102484122A CN 201310248412 A CN201310248412 A CN 201310248412A CN 103401419 A CN103401419 A CN 103401419A
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Abstract
The invention discloses a bidirectional double-input BUCK/BUCKBOOST dc converter and a power distribution method thereof. The dc converter is composed of a BUCK pulse voltage source, a BUCKBOOST pulse current source and an output filter circuit, wherein the BUCK pulse voltage source comprises a power supply and a half-bridge switch block, the BUCKBOOST pulse current source comprises a power supply, a power switch tube and an inductor, and after the BUCK pulse voltage source is embedded into the BUCKBOOST pulse current source, a load is supplied via a filter C. The power distribution method comprises power distribution and load feedback power control is carried out on two input sources, wherein when the required power of the load is greater than the power provided by the power source A, the power source B is discharged; and when the required power of the load is lower than the power provided by the power source A, the power source B is charged. The dc converter and the power distribution method of the invention are characterized by capability of stepping voltage up/down, inversion of output polarity, large adjusting range of output voltage, energy feedback, low loss and high circuit efficiency, etc.
Description
Technical field
The present invention relates to the converters field, relate in particular to a kind of two-way dual input BUCK/BUCKBOOST DC converter and power distribution method thereof.
Background technology
Along with becoming increasingly conspicuous of environmental protection problem, people more and more pay attention to the exploitation of regenerative resource.Regenerative resource has the characteristics such as cheapness, reliable, cleanliness without any pollution, energy abundance, so renewable energy power generation has represented good market prospects.At present, apply more renewable energy power generation form photovoltaic generation is arranged, fuel cell-powered, wind power generation, water generating, geothermal power generation etc., but all exist supply of electric power unstable, discontinuous, with characteristics such as weather conditions variations, therefore need to adopt various energy resources to combine the distributed power supply system of power supply.
In traditional new forms of energy associating electric power system, every kind of energy form needs a DC/DC converter usually, and the various energy is become to direct current output, is connected in parallel on public DC bus, supply with DC load, but its structure is more complicated, and cost is higher.In order to simplify circuit structure, reduce system cost, can replace a plurality of single input direct-current converters with a multi-input direct current converter (Multiple-Input Converter, MIC).MIC allows the various energy resources input, and the character of input source, amplitude and characteristic can be identical, and is also can difference very large, multiple input sources can power to the load respectively or simultaneously, therefore the stability and the flexibility that have improved system, realize the optimization utilization of the energy, and reduce system cost.
Summary of the invention
In order to overcome the above-mentioned problems in the prior art, the object of the invention is to propose all simple DC converter and the power distribution methods thereof that also can realize the automatic distribution utilization of energy of a kind of topological structure and control method.
In order to solve the technical problem of above-mentioned existence, the present invention is achieved by the following technical solutions:
A kind of two-way dual input BUCK/BUCKBOOST DC converter, comprise BUCK type pulse voltage source unit, BUCKBOOST pulse current source unit and output filter circuit;
Described BUCK type pulse voltage source unit comprises the first input dc power potential source A, the first power switch pipe M
1, the second power switch pipe M
3, the positive pole of the first input dc power potential source A and the first power switch pipe M
1Drain electrode connect, the first power switch pipe M
1Source electrode and the second power switch pipe M
3Drain electrode connect, the second power switch pipe M
3Source electrode with the negative pole of the first input dc power potential source A, be connected;
Described BUCKBOOST pulse current source unit comprises the second input dc power potential source B, the 3rd power switch pipe M
2, the 4th power switch pipe M
4And inductance L, the positive pole of the second input dc power potential source B and the 3rd power switch pipe M
2Drain electrode connect, the 3rd power switch pipe M
2Source electrode and the 4th power switch pipe M
4An end of drain electrode, inductance L connect, the negative pole of the first input dc power potential source A in the other end of inductance L and described BUCK type pulse voltage source unit and the second power switch pipe M
3Source electrode connect respectively; The first power switch pipe M in the negative pole of the second input dc power potential source B and described BUCK type pulse voltage source unit
1Source electrode and the second power switch pipe M
3Drain electrode connect respectively;
Described output filter circuit comprises output filter capacitor c, the end of output filter capacitor c respectively with BUCKBOOST pulse current source unit in the 4th power switch pipe M
4Source electrode and the end of load R be connected, the other end of output filter capacitor c respectively with the BUCK type pulse voltage source unit in the first power switch pipe M
1Source electrode, the second power switch pipe M
3Drain electrode and BUCKBOOST pulse current source unit in the negative pole of the second input dc power potential source B and the other end of load R be connected.
The present invention also aims to provide a kind of power distribution method of two-way dual input BUCK/BUCKBOOST DC converter, it comprises following content:
The first input dc power potential source A is photovoltaic cell, and the second input dc power potential source B is storage battery, and BUCK type pulse voltage source unit, BUCKBOOST pulse current source unit are carried out to the control of power division and load feedback power; The first input dc power potential source A inputs with maximum power, by the maximal power tracing algorithm, keep the maximum power input, the second input dc power potential source B, as the power buffer cell, carries out energy by a reverse adjuster (for example pi regulator) of exporting of band and automatically distributes;
During the power that provides greater than the first input dc power potential source A when load R demand power, the second input dc power potential source B electric discharge; Adjuster be output as on the occasion of, be converted into the 3rd power switch pipe M
2Duty ratio, control the discharge power of the second input dc power potential source B;
During the power that provides less than the first input dc power potential source A when load R demand power, the second input dc power potential source B charging; Load voltage raises, and adjuster is output as negative value, is converted into the 4th power switch pipe M
4Duty ratio, control the charge power of the second input dc power potential source B, remain load voltage stable.
Compared with the prior art, two-way dual input BUCK/BUCKBOOST DC converter provided by the invention and power distribution method thereof have following beneficial effect:
The present invention has can realize that the counter-rotating of buck, output polarity, output voltage adjustable range are large, can realize energy feedback, loss efficiency little, circuit is high, the ripple in output voltage waveforms is little, do not need the characteristics such as isolating transformer; Adopt the input of two-way energy, can take full advantage of new forms of energy, and energy bi-directional energy, realize energy-optimised utilization; Easily realize modularization, easily expanded application.
The present invention compares with dual input BUCK/BUCKBOOST circuit, can realize energy feedback.Owing on the dual input basis original, having increased two-way function, when the power of load needs is more, two input source while powering loads, identical with traditional dual input BUCK/BUCKBOOST circuit, when the power of load needs is less, the energy that the electric energy that new forms of energy send needs greater than load, by suitable control, realize that energy back flows, in storage battery, when the electric energy that sends when new forms of energy was not enough, storage battery discharged again by unnecessary energy storage, to remain the stable of output voltage, and then realize that the optimization of energy distributes.
The accompanying drawing explanation
Fig. 1 is two-way dual input BUCK/BUCKBOOST DC converter electrical schematic diagram of the present invention;
Fig. 2 is control system structured flowchart of the present invention;
Fig. 3 to Fig. 8 is the equivalent electric circuit of two-way dual input BUCK/BUCKBOOST DC converter of the present invention in different switch mode;
Fig. 9 is the principle oscillogram that A of the present invention, B power simultaneously;
Figure 10 is the independently-powered principle oscillogram of A of the present invention;
Figure 11 is the independently-powered principle oscillogram of B of the present invention;
Figure 12 is A power supply of the present invention, B energy storage, the principle oscillogram of C power consumption;
Figure 13 is A power supply of the present invention, B energy storage, the principle oscillogram of C feedback energy;
Figure 14 is simulation waveform of the present invention;
Figure 15 is the electrical schematic diagram of the present invention in the solar telephone electric system.
Symbol implication: V in figure
1, V
2Respectively the first input dc power potential source A, the second input dc power potential source B; R is load C; M
1, M
2, M
3, M
4It is respectively the first, the 3rd, second and the 4th power switch pipe; D
1, D
2, D
3, D
4It is respectively the first, the 3rd, second and the 4th power switch pipe body diode; L is inductance; C is output filter capacitor; V
M1, V
M2, V
M3, V
M4Respectively first, the 3rd, second and the driving voltage of the 4th power switch pipe; i
LIt is inductive current; I
LInductive current mean value; i
M1, i
M2, i
M3, i
M4Respectively first, the 3rd, second and the electric current of the 4th power switch pipe; V
OFor output voltage; T, t
0～t
4For the time.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the present invention is described in further detail:
As shown in Figure 1, a kind of two-way dual input BUCK/BUCKBOOST DC converter of the present invention, comprise BUCK type pulse voltage source unit, BUCKBOOST pulse current source unit and output filter circuit;
Described BUCK type pulse voltage source unit comprises that the first input dc power potential source A(is hereinafter to be referred as power supply A), the first power switch pipe M
1, the second power switch pipe M
3, the positive pole of power supply A and the first power switch pipe M
1Drain electrode connect, the first power switch pipe M
1Source electrode and the second power switch pipe M
3Drain electrode connect, the second power switch pipe M
3Source electrode with the negative pole of power supply A, be connected;
Described BUCKBOOST pulse current source unit comprises that the second input dc power potential source B(is hereinafter to be referred as power supply B), the 3rd power switch pipe M
2, the 4th power switch pipe M
4And inductance L, the positive pole of power supply B and the 3rd power switch pipe M
2Drain electrode connect, the 3rd power switch pipe M
2Source electrode and the 4th power switch pipe M
4An end of drain electrode, inductance L connect, the negative pole of the power supply A in the other end of inductance L and described BUCK type pulse voltage source unit and the second power switch pipe M
3Source electrode connect respectively; The first power switch pipe M in the negative pole of power supply B and described BUCK type pulse voltage source unit
1Source electrode and the second power switch pipe M
3Drain electrode connect respectively;
Described output filter circuit comprises output filter capacitor c, the end of output filter capacitor c respectively with BUCKBOOST pulse current source unit in the 4th power switch pipe M
4Source electrode and the end of load R be connected, the other end of output filter capacitor c respectively with the BUCK type pulse voltage source unit in the first power switch pipe M
1Source electrode, the second power switch pipe M
3Drain electrode and BUCKBOOST pulse current source unit in the negative pole of power supply B and the other end of load R be connected.
As shown in control system structured flowchart as of the present invention as Fig. 2, in two-way dual input BUCK/BUCKBOOST DC converter, select master-slave control method to distribute two-way input source input power, power supply A selects solar cell as main power supply unit, power supply B selects storage battery energy power supply unit in support, meets the requirement of regenerative resource power supply system to the preferential utilization of the energy.Regulate simultaneously power supply A input current reference value to realize the maximum power output of solar cell, namely realize MPPT maximum power point tracking (Maximum Power Point Tracking, MPPT).Power supply B by a band oppositely the adjuster (for example pi regulator) of output carry out energy and automatically distribute: when loading demand power during greater than power supply A input power, adjuster be output as on the occasion of, be converted into the 3rd power switch pipe M
2Duty ratio, control the discharge power of power supply B; During less than power supply A input power, load voltage raises when loading demand power, and adjuster is output as negative value, is converted into the 4th power switch pipe M
4Duty ratio, control the charge power of power supply B, remain load voltage stable.
Below in conjunction with Fig. 3～Fig. 8, the operation principle of converter of the present invention is made a concrete analysis of.Before analyzing, first make the following assumptions: 1. all power switch pipes are desirable device, do not consider switching time, conduction voltage drop; 2. all inductance and electric capacity are desirable device.
According to power switch pipe M
1～M
4On off state, converter can be divided into to following six kinds of operation modes.
1, switch mode I:
As shown in Figure 3, M
1, M
2Open-minded, M
3, M
4Turn-off D
3And D
4Conducting, inductance L are respectively by diode D
4And D
3From power supply A, B, drawing energy, inductive current i
LIncrease, current path is respectively V
1-M
1-c-D
4-L and V
2-M
2-L-D
3.
2, switch mode II:
As shown in Figure 4, M
1Open-minded, M
2, M
3And M
4Turn-off D
4Conducting, inductance L is by diode D
4From power supply A, drawing energy, inductive current i
LIncrease, current path is V
1-M
1-c-D
4-L.
3, switch mode III:
As shown in Figure 5, M
2Open-minded, M
1, M
3And M
4Turn-off D
3Conducting, inductance L is by diode D
3From power supply B, drawing energy, inductive current i
LIncrease, current path is V
2-M
2-L-D
3.
4, switch mode IV:
As shown in Figure 6, M
1, M
2, M
3And M
4Turn-off D
3And D
4Conducting, inductance L will be through capacitor c, load R and diode D
3, D
4Afterflow, inductive current i
LReduce, current path is L-D
3-R-D
4.
5, switch mode V:
As shown in Figure 7, M
3, M
4Open-minded, M
1, M
2Turn-off, inductance L is from load unit C, drawing energy, inductive current i
LOppositely increase, current path is R-M
3-L-M
4.
6, switch mode VI:
As shown in Figure 8, M
3Open-minded, M
1, M
2And M
4Turn-off D
2Conducting, inductance L is by diode D
2Afterflow, to B charging, inductive current i
LOppositely reduce, current path is L-D
2-V
2-M
3The electric current of load is provided by capacitor c electric discharge.
As the above analysis, using power supply A(solar cell) and power supply B(storage battery) as two input voltage sources, according to the transmission of energy in circuit in fact, there are 5 kinds of mode of operations in two-way dual input BUCK/BUCKBOOST DC converter:
One, power supply A, power supply B power simultaneously, and the circuit working sequential is I, IV mode, the converter principle waveform as shown in Figure 9, inductive current i
LPermanent in zero;
Two, power supply A powers separately, and the circuit working sequential is II, IV mode, the converter principle waveform as shown in figure 10, inductive current i
LPermanent in zero;
Three, power supply B powers separately, and the circuit working sequential is III, IV mode, the converter principle waveform as shown in figure 11, inductive current i
LPermanent in zero;
Four, power supply A power supply, power supply B energy storage, the load C power consumption, the circuit working sequential is II, IV, V, VI mode, the converter principle waveform as shown in figure 12, inductive current i
LZero passage, but inductive current mean value I
LGreater than zero;
Five, power supply A power supply, power supply B energy storage, the load C feedback, the circuit working sequential is II, IV, V, VI mode, the converter principle waveform as shown in figure 13, inductive current i
LZero passage, but inductive current mean value I
LLess than zero.
As shown in figure 14: wherein (a) is the load switching signal, (b) is output voltage V
OWaveform, (c) be inductive current i
LWaveform.At first, two input powers are powered simultaneously, and after stablizing, the cut-out load, make power supply A input power greater than bearing power, automatically switches to the energy feedback operation mode.According to its operation mode difference, can be divided into two working stages:
Stage 1: two input power is powering load simultaneously, wherein power supply A is carried out to maximal power tracing, and power supply A is inputted with maximum power.By voltage regulator, control the power of power supply B input, make it that not enough power is provided.From (b), finding out output voltage V
OBe stabilized in 50V, from (c), finding out inductive current i
LPermanent in zero.
Stage 2: cut-out load, cause the transient power imbalance, power supply A is by the maximal power tracing algorithm, be operated in maximum power point, and keep constant, due to output voltage greater than set-point, the output of Voltage loop adjuster is reduced, become negative value, power supply B is switched to the energy storage operation mode, makes input power and load consumption power-balance.From (b), finding out that output voltage is stabilized in again 50V by regulating, from (c), finding out inductive current i
LPositive part and negative part are arranged, and explanation can be carried out energy feedback, automatically realizes energy distribution.
In the above course of work, also comprised the operation mode of the independent powering load of two input powers and load-side feedback energy, no longer describe in detail here.By emulation, prove feasibility and the correctness of topological sum power distribution method proposed by the invention.
Below the example that is applied as in solar telephone describes with this topology:
Figure 15 is the electrical schematic diagram of this invention in the solar telephone electric system, and its concrete implementation step is as follows:
1, solar cell and storage battery are simultaneously to the electric system power supply, and when automobile starting or heavy duty, demand power is larger, according to power distribution method proposed by the invention, solar cell is carried out to maximal power tracing, controls M
1Break-make, make solar cell power to electric system with maximum power, then control M
2Break-make, make storage battery that not enough power is provided, and can take full advantage of solar energy like this, with respect to single power supply, can improve instantaneous power.
2, solar cell is powered separately, and when accumulator failure or solar cell just in time met the electric system demand, solar cell was powered separately.At this moment, by controlling M
1Break-make, keep power-balance, guarantees that electric system works well.
3, storage battery is powered separately.When cloudy day or solar cell fault, storage battery is powered separately.By voltage regulator, control M
2Break-make, regulated output voltage, meet the electric system demand.
4, solar cell for supplying power, batteries to store energy, electric system power consumption.Stronger when illumination, the power that solar cell sends during greater than the power of electric system demand, is controlled M
4Break-make, the power storage that solar energy is unnecessary, in storage battery, is avoided energy dissipation, luminous energy is fully utilized.
5, solar cell for supplying power, batteries to store energy, electric system feedback energy.In braking or during descending, electric system is operated in the regenerative braking state, and mechanical energy is converted into to electric energy feedback to input side when automobile, in this case, the energy of the energy that solar cell sends and electric system feedback all will be stored in storage battery, by maximal power tracing, controls M
1Break-make, make solar cell with maximum power output, controls M
4Break-make, in storage battery, avoid energy dissipation by energy storage.
Claims (2)
1. a two-way dual input BUCK/BUCKBOOST DC converter, is characterized in that: comprise BUCK type pulse voltage source unit, BUCKBOOST pulse current source unit and output filter circuit;
Described BUCK type pulse voltage source unit comprises the first input dc power potential source A, the first power switch pipe M
1, the second power switch pipe M
3, the positive pole of the first input dc power potential source A and the first power switch pipe M
1Drain electrode connect, the first power switch pipe M
1Source electrode and the second power switch pipe M
3Drain electrode connect, the second power switch pipe M
3Source electrode with the negative pole of the first input dc power potential source A, be connected;
Described BUCKBOOST pulse current source unit comprises the second input dc power potential source B, the 3rd power switch pipe M
2, the 4th power switch pipe M
4And inductance L, the positive pole of the second input dc power potential source B and the 3rd power switch pipe M
2Drain electrode connect, the 3rd power switch pipe M
2Source electrode and the 4th power switch pipe M
4An end of drain electrode, inductance L connect, the negative pole of the first input dc power potential source A in the other end of inductance L and described BUCK type pulse voltage source unit and the second power switch pipe M
3Source electrode connect respectively; The first power switch pipe M in the negative pole of the second input dc power potential source B and described BUCK type pulse voltage source unit
1Source electrode and the second power switch pipe M
3Drain electrode connect respectively;
Described output filter circuit comprises output filter capacitor c, the end of output filter capacitor c respectively with BUCKBOOST pulse current source unit in the 4th power switch pipe M
4Source electrode and the end of load R be connected, the other end of output filter capacitor c respectively with the BUCK type pulse voltage source unit in the first power switch pipe M
1Source electrode, the second power switch pipe M
3Drain electrode and BUCKBOOST pulse current source unit in the negative pole of the second input dc power potential source B and the other end of load R be connected.
2. the power distribution method of a two-way dual input BUCK/BUCKBOOST DC converter is characterized in that:
It comprises following content:
The first input dc power potential source A is photovoltaic cell, and the second input dc power potential source B is storage battery, and BUCK type pulse voltage source unit, BUCKBOOST pulse current source unit are carried out to the control of power division and load feedback power; The first input dc power potential source A inputs with maximum power, by the maximal power tracing algorithm, keeps the maximum power input, and the second input dc power potential source B, as the power buffer cell, carries out energy by a reverse adjuster of exporting of band and automatically distributes;
During the power that provides greater than the first input dc power potential source A when load R demand power, the second input dc power potential source B electric discharge; Adjuster be output as on the occasion of, be converted into the 3rd power switch pipe M
2Duty ratio, control the discharge power of the second input dc power potential source B;
During the power that provides less than the first input dc power potential source A when load R demand power, the second input dc power potential source B charging; Load voltage raises, and adjuster is output as negative value, is converted into the 4th power switch pipe M
4Duty ratio, control the charge power of the second input dc power potential source B, remain load voltage stable.
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|---|---|---|---|
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| CN2013102484122A CN103401419A (en) | 2013-06-21 | 2013-06-21 | Bidirectional double-input BUCK/BUCKBOOST dc converter and power distribution method thereof |
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| CN103904655A (en) * | 2014-03-24 | 2014-07-02 | 南京航空航天大学 | Power distribution control method for distributed converter system efficiency optimization |
| CN104078692A (en) * | 2013-11-27 | 2014-10-01 | 中科宇图天下科技有限公司 | Control device and control method for microbial fuel cell |
| CN110048397A (en) * | 2019-03-18 | 2019-07-23 | 南京理工大学 | One proton exchanging film fuel battery mixed power supply system |
| CN116224057A (en) * | 2023-05-08 | 2023-06-06 | 中国科学院深海科学与工程研究所 | Switching tube switch performance test and loss analysis circuit and test method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116224057A (en) * | 2023-05-08 | 2023-06-06 | 中国科学院深海科学与工程研究所 | Switching tube switch performance test and loss analysis circuit and test method |
| CN116224057B (en) * | 2023-05-08 | 2023-08-11 | 中国科学院深海科学与工程研究所 | Switching tube switch performance test and loss analysis circuit and test method |
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Application publication date: 20131120 |