CN103346670A - Dual-direction dual-input ZETA/SEPIC direct-current converter and power distribution method thereof - Google Patents
Dual-direction dual-input ZETA/SEPIC direct-current converter and power distribution method thereof Download PDFInfo
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Abstract
Provided is a dual-direction dual-input ZETA/SEPIC direct-current converter and a power distribution method of the dual-direction dual-input ZETA/SEPIC direct-current converter. The direct-current converter comprises a ZETA impulse voltage source, an SEPIC impulse current source and an output filtering circuit. The SEPIC impulse current source comprises a first input direct voltage source A, a first power switching tube M1, a third power switching tube M3, a first inductor L1, a second inductor L2 and a first capacitor C1. The ZATA impulse voltage source comprises a second input direct voltage source B, a second power switching tube M2, a fourth power switching tube M4, a third inductor L3 and a second capacitor C2. The ZETA impulse voltage source is embedded into the SEPIC impulse current source. The output filtering circuit comprises an output filtering capacitor C. The power distribution method includes the steps of conducting power distribution and load feedback power control on the two input sources. The dual-direction dual-input ZETA/SEPIC direct-current converter and the power distribution method of the dual-direction dual-input ZETA/SEPIC direct-current converter can achieve voltage boosting, voltage reduction and energy feedback, are high in circuit efficiency, allow the converter not to be isolated, and are suitable for small and medium-size power new energy joint power supply systems.
Description
[technical field]
The present invention relates to the converters field, relate in particular to a kind of two-way dual input ZETA/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 ZETA/SEPIC DC converter, it is characterized in that: this DC converter comprises ZETA pulse voltage source unit, SEPIC pulse current source unit and output filter circuit;
Described SEPIC pulse current source unit comprises the first input dc power potential source V
1, the first power switch pipe M
1, the 3rd power switch pipe M
3, first inductance L
1, second inductance L
2With first capacitor C
1, the first input dc power potential source V
1Positive pole 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 3rd power switch pipe M
3Source electrode, second inductance L
2An end connect the first input dc power potential source V
1Negative pole and the first power switch pipe M
1Source electrode connect;
Described ZETA pulse voltage source unit comprises the second input dc power potential source V
2, the second power switch pipe M
2, the 4th power switch pipe M
4, the 3rd inductance L
3With second capacitor C
2, the second input dc power potential source V
2Positive pole and the second power switch pipe M
2Drain electrode connect the second power switch pipe M
2Source electrode and the 3rd inductance L
3An end, second capacitor C
2An end connect second capacitor C
2The other end and the 4th power switch pipe M
4Drain electrode connect the 3rd inductance L
3The other end and the second input dc power potential source V
2Negative pole, the 4th power switch pipe M
4Source electrode connect;
Second inductance L in the described SEPIC pulse current source unit
2An end and described ZETA pulse voltage source unit in second capacitor C
2An end, the 4th power switch pipe M
4Drain electrode connect the first input dc power potential source V in the described SEPIC pulse current source unit
1Negative pole and described ZETA pulse voltage source unit in the second input dc power potential source V
2Negative pole, the 3rd inductance L
3An end and the 4th power switch pipe M
4Source electrode connect;
Described output filter circuit comprises output filter capacitor C, and wherein the end of output filter capacitor C connects the 3rd power switch pipe M in the SEPIC pulse current source unit respectively
3Drain electrode and the end of load R, the other end of output filter capacitor C respectively with SEPIC pulse current source unit in the first input dc power potential source V
1Negative pole, the first power switch pipe M
1Source electrode and ZETA pulse voltage source unit in the second input dc power potential source V
2Negative pole, the 3rd inductance L
3An end and the 4th power switch pipe M
4Source electrode and the other end of load R connect.
The present invention also aims to provide a kind of two-way dual input ZETA/SEPIC DC converter power distribution method, comprising:
A kind of power distribution method of two-way dual input ZETA/SEPIC DC converter according to claim 1: it is characterized in that:
It is that photovoltaic cell and second source B are storage battery that the first power supply A is provided, and two input sources are carried out power division and the control of load feedback power;
The second power switch pipe M2 and the 4th power switch pipe M4 are provided;
The first power supply A imports with maximum power, and by the input of maximal power tracing algorithm maintenance maximum power, second 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 power supply A, second source B discharge; When power that loading demand power provides less than the first power supply A, second source B charging; When loading demand power during greater than the first power supply A input power, adjuster be output as on the occasion of, be converted into the second power switch pipe M
2Duty ratio, the discharge power of control second source B; When loading demand power during less than the first 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 second source B, it is stable to keep load voltage.
Because adopt technique scheme, compared with prior art, two-way dual input ZETA/SEPIC DC converter provided by the invention and power distribution method thereof have such beneficial effect:
Circuit of the present invention can be realized 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 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 ZETA/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 ZETA/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 ZETA/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 ZETA/SEPIC DC converter of the present invention is at the equivalent electric circuit of different switch mode.
Figure 11 is the principle oscillogram that the first power supply A of the present invention and second source B power simultaneously.
Figure 12 is the independently-powered principle oscillogram of the first power supply A of the present invention.
Figure 13 is the independently-powered principle oscillogram of second source B of the present invention.
Figure 14 is first power supply A power supply of the present invention, second source B energy storage, the principle oscillogram of output filter capacitor C power consumption.
Figure 15 is first power supply A power supply of the present invention, second source B energy storage, the principle oscillogram of output filter capacitor C feedback energy;
Figure 16 is the electrical schematic diagram of the present invention in the solar telephone electric system.
Symbolic significance in the above-mentioned accompanying drawing: A, B are first, second power supply: V
1, V
2Be respectively the input voltage of first power supply, second source; M
1, M
2, M
3, M
4Be respectively first, second, third, fourth power switch pipe; D
1, D
2, D
3, D
4Be respectively first, second, third, fourth power switch pipe body diode; L
1, L
2, L
3Be respectively first, second, third 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 first, second, third, fourth power switch pipe; i
L1, i
L2, i
L3Be respectively first, second, third inductive current, I
L2Be the second inductive 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 ZETA/SEPIC DC converter comprises ZETA pulse voltage source unit, SEPIC pulse current source unit and output filter circuit;
Described SEPIC pulse current source unit comprises the first input dc power potential source V
1, the first power switch pipe M
1, the 3rd power switch pipe M
3, first inductance L
1, second inductance L
2With first capacitor C
1, the first input dc power potential source V
1Positive pole 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 3rd power switch pipe M
3Source electrode, second inductance L
2An end connect the first input dc power potential source V
1Negative pole and the first power switch pipe M
1Source electrode connect;
Described ZETA pulse voltage source unit comprises the second input dc power potential source V
2, the second power switch pipe M
2, the 4th power switch pipe M
4, the 3rd inductance L
3With second capacitor C
2, the second input dc power potential source V
2Positive pole and the second power switch pipe M
2Drain electrode connect the second power switch pipe M
2Source electrode and the 3rd inductance L
3An end, second capacitor C
2An end connect second capacitor C
2The other end and the 4th power switch pipe M
4Drain electrode connect the 3rd inductance L
3The other end and the second input dc power potential source V
2Negative pole, the 4th power switch pipe M
4Source electrode connect;
Second inductance L in the described SEPIC pulse current source unit
2An end and described ZETA pulse voltage source unit in second capacitor C
2An end, the 4th power switch pipe M
4Drain electrode connect the first input dc power potential source V in the described SEPIC pulse current source unit
1Negative pole and described ZETA pulse voltage source unit in the second input dc power potential source V
2Negative pole, the 3rd inductance L
3An end and the 4th power switch pipe M
4Source electrode connect;
Described output filter circuit comprises output filter capacitor C, and wherein the end of output filter capacitor C connects the 3rd power switch pipe M in the SEPIC pulse current source unit respectively
3Drain electrode and the end of load R, the other end of output filter capacitor C respectively with SEPIC pulse current source unit in the first input dc power potential source V
1Negative pole, the first power switch pipe M
1Source electrode and ZETA pulse voltage source unit in the second input dc power potential source V
2Negative pole, the 3rd inductance L
3An end and the 4th power switch pipe M
4Source electrode and the other end of load R connect.
As shown in Figure 2, according to control system structured flowchart of the present invention, in two-way dual input ZETA/SEPIC DC converter, select principal and subordinate's control mode to distribute two-way input dc power potential source input power, the first power supply A selects for use solar cell as main power supply unit, it is reserve energy power supply unit that second source B selects storage battery for use, meets the regenerative resource power supply system to the requirement of the preferential utilization of the energy.Regulate the first power supply A source input current reference value simultaneously to realize the maximum power output of solar cell, namely realize MPPT maximum power point tracking (Maximum PowerPoint Tracking, MPPT).Second source 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 the first power supply A input power, adjuster be output as on the occasion of, be converted into the second power switch pipe M
2Duty ratio, the discharge power of control second source B; When loading demand power during less than the first 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 second source 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 above-mentioned each element first～the 4th definition only is used for distinguishing different elements, and does not have sequencing, under the situation that the clear expression of element numbers is being arranged, also can omit these first, second statement; And in circuit field, some special sign has represented the title of element, so below in the statement of operation mode, be simple description, the subelement title is omitted.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 D
3And D
4Conducting, first inductance L
1From power supply A, draw energy, the first inductive current i
L1Increase, current path is A-L
1-M
1, first capacitor C
1By the first power switch pipe M
1, diode D
4To second inductance L
2Discharge, current path is C
1-M
1-D
4-L
2Power supply B and second capacitor C
2To output filter capacitor C power supply, the second inductive current i
L2Increase, current path is B-M
2-C
2-L
2-D
3-C, the 3rd inductance L simultaneously
3B draws energy, the 3rd inductive current i from the input second source
L3Increase, current path is B-M
2-L
3
2. switch mode II:
As shown in Figure 4, M
1Open-minded, M
2, M
3And M
4Turn-off D
4Conducting, first inductance L
1From power supply A, draw energy, the first inductive current i
L1Increase, current path is A-L
1-M
1, first capacitor C
1By the first power switch pipe M
1, diode D
4To second inductance L
2Discharge, current path is C
1-M
1-D
4-L
2, the electric current of load is then provided by output filter capacitor C discharge.
3. switch mode III:
As shown in Figure 5, M
2Open-minded, M
1, M
3And M
4Turn-off D
3Conducting, power supply B and second capacitor C
2To output filter capacitor C power supply, the second inductive current i
L2Increase, current path is B-M
2-C
2-L
2-D
3-C, the 3rd inductance L simultaneously
3B draws energy, the 3rd inductive current i from the input power supply
L3Increase, current path is B-M
2-L
3
4. switch mode IV:
As shown in Figure 6, M
1, M
2, M
3And M
4Turn-off D
3And D
4Conducting, first inductance L
1Will be through first capacitor C
1, diode D
3, output filter capacitor C and load R afterflow, the first inductive current i
L1Reduce, current path is A-L
1-C
1-D
3-C; The 3rd inductance L
3By diode D
4To second capacitor C
2Afterflow, the 3rd inductive current i are finished in charging
L3Reduce, current path is L
, 3-D
4-C
2Simultaneously, second inductance L
2Through diode D
3, D
4With output filter capacitor C, load R finishes afterflow, the second inductive current i
L2Reduce, current path is L
2-D
3-C-D
4
5. switch mode V:
As shown in Figure 7, M
1, M
2, M
3And M
4Turn-off D
3And D
4Conducting, first inductance L
1Will be through first capacitor C
1, diode D
3, output filter capacitor C and load R afterflow, the first inductive current i
L1Reduce, current path is A-L
1-C
1-D
3-C, second inductance L simultaneously
2Through diode D
3, D
4With output filter capacitor C, load R finishes afterflow, the second inductive current i
L2Reduce, current path is L
2-D
3-C-D
4
6. switch mode VI:
As shown in Figure 8, M
1, M
2, M
3And M
4Turn-off D
3And D
4Conducting, the 3rd inductance L
3By diode D
4To second capacitor C
2Afterflow, the 3rd inductive current i are finished in charging
L3Reduce, current path is L
3-D
4-C
2, second inductance L
2Through diode D
3, D
4With output filter capacitor C, load R finishes afterflow, the second inductive current i
L2Reduce, current path is L
2-D
3-C-D
4
7. switch mode VII:
As shown in Figure 9, M
3, M
4Open-minded, M
1, M
2Turn-off second inductance L
2From load unit, draw energy, the second inductive current i
L2Oppositely increase, current path is C-M
3-L
2-M
4
8. switch mode VIII:
As shown in figure 10, M
3Open-minded, M
1, M
2And M
4Turn-off D
2Conducting, second inductance L
2By second capacitor C
2, diode D
2Afterflow is to B charging, the second inductive current i
L2Oppositely reduce, current path is L
2-C
2-D
2-B-C-M
3
As the above analysis, 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 ZETA/SEPIC DC converter with photovoltaic cell (A source) and storage battery (B source):
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 second inductive current 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 second inductive current i
L2Permanent 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 second inductive 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 second inductive current i
L2Zero passage, but the second inductive current mean value I
L2Greater 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 second inductive current i
L2Zero passage, but the second inductive current mean value I
L2Less than zero.
Describe with the example that is applied as of this topology in solar telephone below:
Figure 16 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. two-way dual input ZETA/SEPIC DC converter, it is characterized in that: this DC converter comprises ZETA pulse voltage source unit, SEPIC pulse current source unit and output filter circuit;
Described SEPIC pulse current source unit comprises the first input dc power potential source (V
1), the first power switch pipe (M
1), the 3rd power switch pipe (M
3), the first inductance (L
1), the second inductance (L
2) and the first electric capacity (C
1), the first input dc power potential source (V
1) positive pole and the first inductance (L
1) an end connect the first inductance (L
1) the other end and the first power switch pipe (M
1) drain electrode, the first electric capacity (C
1) an end connect the first electric capacity (C
1) the other end and the 3rd power switch pipe (M
3) source electrode, the second inductance (L
2) an end connect the first input dc power potential source (V
1) negative pole and the first power switch pipe (M
1) source electrode connect;
Described ZETA pulse voltage source unit comprises the second input dc power potential source (V
2), the second power switch pipe (M
2), the 4th power switch pipe (M
4), the 3rd inductance (L
3) and the second electric capacity (C
2), the second input dc power potential source (V
2) positive pole and the second power switch pipe (M
2) drain electrode connect the second power switch pipe (M
2) source electrode and the 3rd inductance (L
3) an end, the second electric capacity (C
2) an end connect the second electric capacity (C
2) the other end and the 4th power switch pipe (M
4) drain electrode connect the 3rd inductance (L
3) the other end and the second input dc power potential source (V
2) negative pole, the 4th power switch pipe (M
4) source electrode connect;
Second inductance (the L in the described SEPIC pulse current source unit
2) an end and described ZETA pulse voltage source unit in the second electric capacity (C
2) an end, the 4th power switch pipe (M
4) drain electrode connect the first input dc power potential source (V in the described SEPIC pulse current source unit
1) negative pole and described ZETA pulse voltage source unit in the second input dc power potential source (V
2) negative pole, the 3rd inductance (L
3) an end and the 4th power switch pipe (M
4) source electrode connect;
Described output filter circuit comprises output filter capacitor (C), and wherein an end of output filter capacitor (C) connects the 3rd power switch pipe (M in the SEPIC pulse current source unit respectively
3) drain electrode and an end of load (R), the other end of output filter capacitor (C) respectively with SEPIC pulse current source unit in the first input dc power potential source (V
1) negative pole, the first power switch pipe (M
1) source electrode and ZETA pulse voltage source unit in the second input dc power potential source (V
2) negative pole, the 3rd inductance (L
3) an end and the 4th power switch pipe (M
4) source electrode and the other end of load (R) connect.
2. power distribution method of two-way dual input ZETA/SEPIC DC converter according to claim 1: it is characterized in that:
It is that photovoltaic cell and second source (B) are storage battery that first power supply (A) is provided, and two input sources are carried out power division and the control of load feedback power;
Second power switch pipe (the M is provided
2) and the 4th power switch pipe (M
4);
First power supply (A) is imported with maximum power, and by the input of maximal power tracing algorithm maintenance maximum power, second 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 first power supply (A), second source (B) discharge; When power that loading demand power provides less than first power supply (A), second source (B) charging; When loading demand power during greater than first power supply (A) input power, adjuster be output as on the occasion of, be converted into the second power switch pipe (M
2) duty ratio, control second source (B) discharge power; When loading demand power during less than first power supply (A) input power, load voltage raises, and adjuster is output as negative value, is converted into the 4th power switch pipe (M
4) duty ratio, the charge power of control second source (B), it is stable to keep load voltage.
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| WO2021213255A1 (en) * | 2020-04-20 | 2021-10-28 | Ampd Energy Limited | Energy storage system and method of boosting an electrical power for outputting to a load |
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|---|---|---|---|---|
| KR20150050143A (en) * | 2013-10-31 | 2015-05-08 | 삼성전기주식회사 | Power sepply device |
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