CN103269157A - Bi-directional dual-input SEPIC direct-current converter and power distribution method thereof - Google Patents
Bi-directional dual-input SEPIC direct-current converter and power distribution method thereof Download PDFInfo
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Abstract
The invention discloses a bi-directional dual-input SEPIC direct-current converter and a power distribution method of the bi-directional dual-input SEPIC direct-current converter. The bi-directional dual-input SEPIC direct-current converter comprises a first SEPIC pulse current source unit, a second SEPIC pulse current source unit and an output filter circuit. The first SEPIC pulse current source unit comprises a first input direct current voltage source A, a first power switch tube M1, a second power switch tube M3, a first inductor L1, a second inductor L3 and a first capacitor C1. The second SEPIC pulse current source unit comprises a second input direct current voltage source B, a third power switch tube M2, a fourth power switch tube M4, a third inductor L2, a fourth inductor L4 and a second capacitor C2. The first SEPIC pulse current source unit and the second SEPIC pulse current source unit are connected in parallel, and the output filter circuit comprises an output filter capacitor C. The power distribution method includes power distribution and load feedback power control which are carried out on the two input direct current voltage sources. The bi-directional dual-input SEPIC direct-current converter and the power distribution method of the bi-directional dual-input SEPIC direct-current current have the advantages of being complex in circuit structure, capable of achieving boost and voltage reduction, wide in adjusting range of output voltage, capable of achieving energy feedback, small in loss, high in circuit efficiency, small in ripple in output voltage waveform and capable of being used on a large current occasion due to connection of two current sources in parallel, and an isolation transformer is not needed.
Description
Technical field
The present invention relates to the converters field, relate in particular to a kind of two-way dual input SEPIC 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 development and use of regenerative resource.Regenerative resource has characteristics such as cheapness, reliable, cleanliness without any pollution, energy abundance, so renewable energy power generation has represented good market prospects.At present, use more renewable energy power generation form photovoltaic generation is arranged, fuel cell-powered, wind power generation, water generating, geothermal power generation etc., but these forms of electricity generation all exist the supply of electric power instability, discontinuous, with characteristics such as weather conditions variations, therefore need to adopt various energy resources to unite 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 are become direct current output, is connected in parallel on the public dc bus, supplies with DC load, but its structure is complicated, and cost is higher.In order to simplify circuit structure, reduce system cost, can (Multiple-Input Converter MIC) replaces a plurality of single DC converter of importing with a multi-input direct current converter.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 big, multiple input sources can power to the load respectively or simultaneously, therefore stability and the flexibility that has improved system realizes the optimization utilization of the energy, and reduces system cost.
Summary of the invention
In order to overcome the above-mentioned problems in the prior art, the object of the present invention is to provide a kind of topological structure and control method all simpler, and can realize the topological structure of the automatic distribution utilization of energy.
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 SEPIC DC converter comprises a SEPIC pulse current source unit, the 2nd SEPIC pulse current source unit and output filter circuit;
A described SEPIC pulse current 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, first inductance L
1, second inductance L
3With first capacitor C
1, the positive pole of the first input dc power potential source A and first inductance L
1An end connect first inductance L
1The other end and the first power switch pipe M
1Drain electrode, first capacitor C
1An end connect first capacitor C
1The other end and the second power switch pipe M
3Source electrode, second inductance L
3An end connect second inductance L
3The other end and negative pole, the first power switch pipe M of the first input dc power potential source A
1Source electrode connect;
Described the 2nd SEPIC 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
4, the 3rd inductance L
2, the 4th inductance L
4With second capacitor C
2, the positive pole of the second input dc power potential source B and the 3rd inductance L
2An end connect the 3rd inductance L
2The other end and the 3rd power switch pipe M
2Drain electrode, second capacitor C
2An end connect second capacitor C
2The other end and the 4th power switch pipe M
4Source electrode, the 4th inductance L
4An end connect the 4th inductance L
4The other end and negative pole, the 3rd power switch pipe M of the second input dc power potential source B
2Source electrode connect;
A described SEPIC pulse current source unit and described the 2nd SEPIC pulse current source unit are connected in parallel;
Described output filter circuit comprises output filter capacitor C, and wherein the end of output filter capacitor C connects the second power switch pipe M in the SEPIC pulse current source unit respectively
3Drain electrode, the 4th power switch pipe M in the 2nd SEPIC pulse current source unit
4Drain electrode and the end of load R, the other end of output filter capacitor C respectively with a SEPIC pulse current source unit in second inductance L
3, the 4th inductance L in the 2nd SEPIC pulse current source unit
4And the other end of load R connects.
The present invention also aims to provide a kind of two-way dual input SEPIC DC converter power distribution method, 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 two input direct voltages are carried out power division and the control of load feedback power in a steady stream.The first input dc power potential source A imports with maximum power, and by the input of maximal power tracing algorithm maintenance maximum power, the second input dc power potential source B is as the power buffer cell, and by a band oppositely the adjuster of output carry out energy and distribute automatically: when the power that loading demand power provides greater than the first input dc power potential source A, second input dc power potential source B discharge; When power that loading demand power provides less than the first input dc power potential source A, second input dc power potential source B charging; When loading demand power during greater than the first input dc power potential source 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 the second input dc power potential source B; When loading demand power during less than the first input dc power potential source A input power, 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, it is stable to keep load voltage.
Because adopt technique scheme, compared with prior art, two-way dual input SEPIC DC converter provided by the invention and power distribution method thereof have such beneficial effect:
Though the present invention's circuit structure is complicated, has following characteristics: can realize that buck, output voltage adjustable range are big, can realize the energy feedback, loss is little, the efficient height of circuit, the ripple in the output voltage waveforms are little, do not need isolating transformer; Two current source parallel connections can be used in big current applications; 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 SEPIC circuit, can realize the energy feedback.Owing to increased two-way function on original dual input basis, the power that needs when load more for a long time, two input source while powering loads, identical with traditional dual input SEPIC circuit, the power that needs when load more after a little while, the energy that the electric energy that new forms of energy send needs greater than load, by suitable control, the realization energy back flows, unnecessary energy is stored in the storage battery, and when the electric energy that sends when new forms of energy was not enough, storage battery discharged again, keeping the stable of output voltage, and then realize energy optimization distribution.
Description of drawings
Fig. 1 is two-way dual input SEPIC DC converter electrical schematic diagram of the present invention;
Fig. 2 is control system structured flowchart of the present invention;
Fig. 3 to Figure 10 is that two-way dual input SEPIC DC converter of the present invention is at the equivalent electric circuit of different switch mode;
The principle oscillogram that Figure 11 powers simultaneously for A, B among the present invention;
Figure 12 is the independently-powered principle oscillogram of A among the present invention;
Figure 13 is the independently-powered principle oscillogram of B among the present invention;
Figure 14 is A power supply among the present invention, B energy storage, the principle oscillogram of C power consumption;
Figure 15 is A power supply among the present invention, B energy storage, the principle oscillogram of C feedback energy;
Figure 16 is simulation waveform of the present invention;
Figure 17 is the electrical schematic diagram of the present invention in the solar telephone electric system.
Symbolic significance in the above-mentioned accompanying drawing: V
1, V
2Be respectively the first input dc power potential source A, the second input dc power potential source B input voltage; M
1, M
2, M
3, M
4Be respectively the first, the 3rd, second, the 4th power switch pipe; D
1, D
2, D
3, D
4Be respectively the first, the 3rd, second, the 4th power switch pipe body diode; L
1, L
2, L
3, L
4Be respectively the first, the 3rd, second, the 4th inductance; C
1, C
2Be respectively first, second electric capacity; C is output filter capacitor; R is load; V
M1, V
M2, V
M3, V
M4Be respectively the driving voltage of the first, the 3rd, second, the 4th power switch pipe; i
L1, i
L2Be the input inductance electric current, i is load current, and I is load current mean value; V
OBe output voltage; T, t
0～t
4Be 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 SEPIC DC converter comprises a SEPIC pulse current source unit, the 2nd SEPIC pulse current source unit and output filter circuit;
A described SEPIC pulse current 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, first inductance L
1, second inductance L
3With first capacitor C
1, the positive pole of power supply A and first inductance L
1An end connect first inductance L
1The other end and the first power switch pipe M
1Drain electrode, first capacitor C
1An end connect first capacitor C
1The other end and the second power switch pipe M
3Source electrode, second inductance L
3An end connect second inductance L
3The other end and negative pole, the first power switch pipe M of power supply A
1Source electrode connect;
Described the 2nd SEPIC pulse current source unit comprises the second input dc power potential source B (hereinafter to be referred as power supply B), the 3rd power switch pipe M
2, the 4th power switch pipe M
4, the 3rd inductance L
2, the 4th inductance L
4With second capacitor C
2, the positive pole of power supply B and the 3rd inductance L
2An end connect the 3rd inductance L
2The other end and the 3rd power switch pipe M
2Drain electrode, second capacitor C
2An end connect second capacitor C
2The other end and the 4th power switch pipe M
4Source electrode, the 4th inductance L
4An end connect the 4th inductance L
4The other end and negative pole, the 3rd power switch pipe M of power supply B
2Source electrode connect;
A described SEPIC pulse current source unit and described the 2nd SEPIC pulse current source unit are connected in parallel;
Described output filter circuit comprises output filter capacitor C, and wherein the end of output filter capacitor C connects the second power switch pipe M in the SEPIC pulse current source unit respectively
3Drain electrode, the 4th power switch pipe M in the 2nd SEPIC pulse current source unit
4Drain electrode and the end of load R, the other end of output filter capacitor C respectively with a SEPIC pulse current source unit in second inductance L
3, the 4th inductance L in the 2nd SEPIC pulse current source unit
4And the other end of load R connects.
As shown in Figure 2, according to control system structured flowchart of the present invention, in two-way dual input SEPIC DC converter, select principal and subordinate's control mode to distribute two-way input dc power potential source input power, power supply A selects for use solar cell as main power supply unit, it is reserve energy power supply unit that power supply B selects storage battery for use, meets the regenerative resource power supply system to the requirement of the preferential utilization of the energy.Regulate power supply A input current reference value simultaneously 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 distribute automatically: 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, the discharge power of control power supply B; When loading demand power during less than power supply A input power, load voltage raises, and adjuster is output as negative value, is converted into the 4th power switch pipe M
4Duty ratio, the charge power of control power supply B, it is stable to keep load voltage.
Operation principle below in conjunction with the converter of the present invention of Fig. 3～Figure 10 is made a concrete analysis of.Before analyzing, make the following assumptions earlier: 1. all switching tubes 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 following eight kinds of operation modes:
1. switch mode I:
As shown in Figure 3, M
1, M
2Open-minded, M
3, M
4Turn-off inductance L
1And L
2Respectively from power supply V
1, V
2In draw energy, inductive current i
L1, i
L2Increase, current path is respectively V
1-L
1-M
1And V
2-L
2-M
2Capacitor C
1To L
3Discharge, capacitor C
2To L
4Discharge, current path is respectively C
1-M
1-L
3And C
2-M
2-L
4The electric current of load is then provided by capacitor C discharge.
2. switch mode II:
As shown in Figure 4, M
1Open-minded, M
2, M
3And M
4Turn-off inductance L
1From power supply V
1In draw energy, inductive current i
L1Increase, current path is V
1-L
1-M
1Capacitor C
1To L
3Discharge, current path is C
1-M
1-L
3The electric current of load is then provided by capacitor C discharge.
3. switch mode III:
As shown in Figure 5, M
2Open-minded, M
1, M
3And M
4Turn-off inductance L
2From power supply V
2In draw energy, inductive current i
L2Increase, current path is V
2-L
2-M
2Capacitor C
2To L
4Discharge, current path C
2-M
2-L
4The electric current of load is then provided by capacitor C discharge.
4. switch mode IV:
As shown in Figure 6, M
1, M
2, M
3And M
4Turn-off D
3And D
4Conducting, inductance L
1Will be through capacitor C
1, diode D
3, capacitor C and load R afterflow, inductance L
2Will be through capacitor C
2, diode D
4, capacitor C and load R afterflow, inductive current i
L1, i
L2Reduce, current path is respectively V
1-L
1-C
1-D
3-C and V
2-L
2-C
2-D
4-C.Simultaneously, inductance L
3Through diode D
3With capacitor C, load R finishes afterflow, inductance L
4Through diode D
4With capacitor C, load R finishes afterflow, and current path is respectively L
3-D
3-C and L
4-D
4-C.
5. switch mode V:
As shown in Figure 7, M
1, M
2, M
3And M
4Turn-off D
3Conducting, inductance L
1Will be through capacitor C
1, diode D
3, capacitor C and load R afterflow, inductive current i
L1Reduce, current path is V
1-L
1-C
1-D
3-C.Simultaneously, L
3Through diode D
3With capacitor C, load R finishes afterflow, and current path is L
3-D
3-C.
6. switch mode VI:
As shown in Figure 8, M
1, M
2, M
3And M
4Turn-off D
4Conducting, inductance L
2Will be through capacitor C
2, diode D
4, capacitor C and load R afterflow, inductive current i
L2Reduce, current path is V
2-L
2-C
2-D
4-C.Simultaneously, L
4Through diode D
4With capacitor C, load R finishes afterflow, and current path is L
4– D
4-C.
7. switch mode VII:
As shown in Figure 9, M
4Open-minded, M
1, M
2And M
3Turn-off, load unit passes through C
2And L
2Give V
2Charging, inductive current i
L2Oppositely increase, current path is C-M
4-C
2-L
2-V
2The while inductance L
4Draw energy from load unit, current path is C-M
4-L
4
8. switch mode VIII:
As shown in figure 10, M
1, M
2, M
3And M
4Turn-off D
2Conducting, L
2Pass through D
2V is given in afterflow
2Charging, inductive current i
L2Oppositely reduce, current path is L
2-V
2-D
2The while inductance L
4Through diode D
2With capacitor C
2Finish afterflow, current path is L
4-D
2-C
2
As the above analysis, with power supply A (solar cell) and power supply B(storage battery) as two input voltage sources, according to the transmission of energy in the circuit, there are 5 kinds of mode of operations in two-way dual input SEPIC 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 11, the input inductance current i
L1, i
L2Permanent in zero;
Two, power supply A powers separately, and the circuit working sequential is II, V mode, the converter principle waveform as shown in figure 12, the input inductance current i
L1Permanent in zero;
Three, power supply B powers separately, and the circuit working sequential is III, VI mode, the converter principle waveform as shown in figure 13, the input inductance current i
L2Permanent in zero;
Four, power supply A power supply, power supply B energy storage, the C power consumption, the circuit working sequential is II, V, VII, VIII mode, the converter principle waveform as shown in figure 14, the input inductance current i
L2Zero passage, but load current mean value I is greater than zero;
Five, power supply A power supply, power supply B energy storage, the C feedback, the circuit working sequential is II, V, VII, VIII mode, the converter principle waveform as shown in figure 15, the input inductance current i
L2Zero passage, but load current mean value I is less than zero.
As shown in figure 16: wherein (a) is the load switching signal, (b) is output voltage V
OWaveform (c) is load current i waveform.At first, two input power supplys are powered simultaneously, and after stablizing, the cut-out load makes power supply A input power greater than bearing power, automatically switches to energy feedback operation mode.Can be divided into two working stages according to its operation mode difference:
Stage 1: two input power supply is powering load simultaneously, wherein power supply A is carried out maximal power tracing, and power supply A is imported with maximum power.Power by voltage regulator control power supply B input makes it that not enough power is provided.From (b) as can be seen output voltage stabilization at 50V, from (c) as can be seen load current i perseverance greater than 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, because output voltage is greater than set-point, the output of Voltage loop adjuster is reduced, become negative value, power supply B switches to the energy storage operation mode, makes input power and load consumption power-balance.Output voltage is stabilized in 50V again by regulating as can be seen from (b), and load current i has positive part and negative part as can be seen from (c), and explanation can be carried out the energy feedback, realizes energy distribution automatically.
In the above course of work, also comprised the operation mode of the two input independent powering loads of power supply and load-side feedback energy, do not describing in detail here.Prove feasibility and the correctness of topological sum power distribution method proposed by the invention by emulation.
Describe with the example that is applied as of this topology in solar telephone below:
Figure 17 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 bigger, according to power distribution method proposed by the invention, solar cell is carried out maximal power tracing, control M
1Break-make makes solar cell power to electric system with maximum power, controls M again
2Break-make makes 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 satisfied the electric system demand, solar cell was powered separately.At this moment, by control M
1Break-make keeps 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 satisfies 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 is during greater than the power of electric system demand, control M
4Break-make, the power that solar energy is unnecessary is stored in the storage battery, avoids energy dissipation, luminous energy is fully utilized.
5, solar cell for supplying power, batteries to store energy, electric system feedback energy.When automobile in braking or during descending, electric system is operated in the regenerative braking state, mechanical energy is converted into electric energy feeds back to input side, in this case, the energy of the energy that solar cell sends and electric system feedback all will be stored in the storage battery, by maximal power tracing, and control M
1Break-make makes solar cell export with maximum power, control M
4Break-make is stored into energy in the storage battery, avoids energy dissipation.
Claims (2)
1. a two-way dual input SEPIC DC converter is characterized in that: comprise a SEPIC pulse current source unit, the 2nd SEPIC pulse current source unit and output filter circuit;
A described SEPIC pulse current 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, first inductance L
1, second inductance L
3With first capacitor C
1, the positive pole of the first input dc power potential source A and first inductance L
1An end connect first inductance L
1The other end and the first power switch pipe M
1Drain electrode, first capacitor C
1An end connect first capacitor C
1The other end and the second power switch pipe M
3Source electrode, second inductance L
3An end connect second inductance L
3The other end and negative pole, the first power switch pipe M of the first input dc power potential source A
1Source electrode connect;
Described the 2nd SEPIC 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
4, the 3rd inductance L
2, the 4th inductance L
4With second capacitor C
2, the positive pole of the second input dc power potential source B and the 3rd inductance L
2An end connect the 3rd inductance L
2The other end and the 3rd power switch pipe M
2Drain electrode, second capacitor C
2An end connect second capacitor C
2The other end and the 4th power switch pipe M
4Source electrode, the 4th inductance L
4An end connect the 4th inductance L
4The other end and negative pole, the 3rd power switch pipe M of the second input dc power potential source B
2Source electrode connect;
A described SEPIC pulse current source unit and described the 2nd SEPIC pulse current source unit are connected in parallel;
Described output filter circuit comprises output filter capacitor C, and wherein the end of output filter capacitor C connects the second power switch pipe M in the SEPIC pulse current source unit respectively
3Drain electrode, the 4th power switch pipe M in the 2nd SEPIC pulse current source unit
4Drain electrode and the end of load R, the other end of output filter capacitor C respectively with a SEPIC pulse current source unit in second inductance L
3, the 4th inductance L in the 2nd SEPIC pulse current source unit
4And the other end of load R connects.
2. the power distribution method of a two-way dual input SEPIC 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 two input dc power potential sources are carried out power division and the control of load feedback power.The first input dc power potential source A imports with maximum power, and by the input of maximal power tracing algorithm maintenance maximum power, the second input dc power potential source B is as the power buffer cell, and by a band oppositely the adjuster of output carry out energy and distribute automatically: when the power that loading demand power provides greater than the first input dc power potential source A, second input dc power potential source B discharge; When power that loading demand power provides less than the first input dc power potential source A, second input dc power potential source B charging; When loading demand power during greater than the first input dc power potential source 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 the second input dc power potential source B; When loading demand power during less than the first input dc power potential source A input power, 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, it is stable to keep load voltage.
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| CN104022632A (en) * | 2014-06-26 | 2014-09-03 | 缪恢宏 | Input zero-ripple wave converter |
| CN104734496A (en) * | 2015-03-31 | 2015-06-24 | 国家电网公司 | SEPIC feed buck-boost converter |
| CN107453603A (en) * | 2017-09-30 | 2017-12-08 | 湘潭大学 | A kind of dual input Sepic converters |
| CN107910933A (en) * | 2017-11-23 | 2018-04-13 | 南京欧陆电气股份有限公司 | Communication power supply charging and voltage stabilizing module |
| CN109586603A (en) * | 2018-09-03 | 2019-04-05 | 中国石油大学(华东) | The double SEPIC bucks of modularization export the combined inverter of inverse parallel |
| US10944283B2 (en) | 2017-12-22 | 2021-03-09 | Industrial Technology Research Institute | Distributed single-stage on-board charging device and method thereof |
| CN113258773A (en) * | 2021-05-18 | 2021-08-13 | 阳光电源股份有限公司 | Power conversion system, power conversion device and control method thereof |
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| CN107910933B (en) * | 2017-11-23 | 2021-03-26 | 南京欧陆电气股份有限公司 | Charging voltage-stabilizing module for communication power supply |
| US10944283B2 (en) | 2017-12-22 | 2021-03-09 | Industrial Technology Research Institute | Distributed single-stage on-board charging device and method thereof |
| CN109586603A (en) * | 2018-09-03 | 2019-04-05 | 中国石油大学(华东) | The double SEPIC bucks of modularization export the combined inverter of inverse parallel |
| CN113258773A (en) * | 2021-05-18 | 2021-08-13 | 阳光电源股份有限公司 | Power conversion system, power conversion device and control method thereof |
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