CN108123635B - One kind zero inputs ripple and polarity inverts output type Miniature inverter - Google Patents
One kind zero inputs ripple and polarity inverts output type Miniature inverter Download PDFInfo
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- CN108123635B CN108123635B CN201611086515.3A CN201611086515A CN108123635B CN 108123635 B CN108123635 B CN 108123635B CN 201611086515 A CN201611086515 A CN 201611086515A CN 108123635 B CN108123635 B CN 108123635B
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- decoupling
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- polarity
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- 239000003990 capacitor Substances 0.000 claims abstract description 27
- 238000004804 winding Methods 0.000 claims abstract description 23
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 238000002955 isolation Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 230000009466 transformation Effects 0.000 claims description 2
- 230000005611 electricity Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 235000016936 Dendrocalamus strictus Nutrition 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008771 sex reversal Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Classifications
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal 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
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal 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, e.g. single switched pulse inverters in a bridge configuration
-
- H02J3/383—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
Ripple is inputted the invention discloses one kind zero and polarity inverts output type Miniature inverter.The inverter includes DC power supply, input capacitance, truncation diode, primary side switch pipe, decoupling inductance, decoupling diode, decoupling capacitance, decoupling switch pipe, isolating transformer, secondary side diode, filter capacitor, power frequency polarity reversion inverter bridge, output filter circuit and power grid.The present invention joined the decoupling circuit being made of decoupling inductance, decoupling diode, decoupling capacitance, decoupling switch pipe and isolating transformer auxiliary winding in the input side of inverter, DC supply input side power ripple as caused by output AC power can effectively be decoupled, it avoids achieving the purpose that extend Miniature inverter service life as decoupling capacitance using the electrolytic capacitor that volume is big, reliability is low.
Description
Technical field
Ripple is inputted the present invention relates to one kind zero and polarity inverts output type Miniature inverter, belongs to isolation, miniature inversion
Device eliminates DC supply input side power ripple as caused by output AC power using increased decoupling circuit.
Background technique
In grid-connected power generation system, the output power of gird-connected inverter contains the power ripple of twice mains frequency,
And input power is controlled as constant power, the imbalance problem of input power and output power usually passes through simultaneously the United Nations General Assembly's electricity
Capacitor is solved to solve.Since the frequency of power ripple is only twice of power frequency, required capacitance compares larger, and is electrolysed
The service life of capacitor is also limited, and has seriously affected stability and the service life of gird-connected inverter.In recent years, domestic outgoing
The method for having showed many decoupling power ripples, greatly reduces capacitance needed for inverter, so as to select capacity
Small, service life long capacitor replaces electrolytic capacitor, achievees the purpose that the whole service life for extending inverter.
Miniature photovoltaic grid-connected inverter due to its capacity usage ratio is high, set expandability is good, be easily installed the advantages that, have
Wide application prospect.In particular, Miniature inverter is combined composition alternative electric generation with single solar-energy photo-voltaic cell array
When module, inverter needs the service life to match with photovoltaic cell.Zero ripple for realizing inverter input side, bans electrolysis
Capacitor, the power density for improving miniature photovoltaic grid-connected inverter have important practical significance.
Summary of the invention
It is an object of the invention to provide one kind zero for technological deficiency present in traditional gird-connected inverter to input ripple
Output type Miniature inverter is inverted with polarity, not only realizes transformation of electrical energy, but also decoupled the secondary power of DC supply input side
Ripple effectively increases the reliability and service life of inverter.
The present invention to achieve the above object, adopts the following technical scheme that
One kind zero of the invention inputs ripple and polarity inverts output type Miniature inverter, including DC power supply, input electricity
Hold, truncation diode, primary side switch pipe, isolating transformer, secondary side diode, filter capacitor, power frequency polarity reversion inverter bridge,
Output filter circuit and power grid；Wherein DC power anode, input capacitance one end with truncation diode anode be connected,
The cathode of DC power supply, the other end of input capacitance are connected with the emitter of primary side switch pipe；Be truncated diode cathode and
The Same Name of Ends of isolating transformer primary side winding is connected, the non-same polarity of isolating transformer primary side winding and primary side switch pipe
Collector is connected；Power frequency polarity invert inverter bridge include two thyristors and two switching tubes, the anode of the first thyristor and
The anode of second thyristor, which is connected, constitutes the positive input terminal of power frequency polarity reversion inverter bridge, the emitter of first switch tube and the
The emitter of two switching tubes, which is connected, constitutes the negative input end of power frequency polarity reversion inverter bridge, the cathode of the first thyristor and first
The collector of switching tube, which is connected, constitutes the positive output end of power frequency polarity reversion inverter bridge, and the cathode of the second thyristor and second is opened
Close pipe collector be connected constitute power frequency polarity reversion inverter bridge negative output terminal, isolating transformer vice-side winding it is non-of the same name
End is connected with the anode of secondary side diode, the Same Name of Ends of isolating transformer vice-side winding, one end of filter capacitor and power frequency pole
The negative input end of sex reversal inverter bridge is connected, the cathode of secondary side diode, the other end of filter capacitor and the reversion of power frequency polarity
The positive input terminal of inverter bridge is connected, and power frequency polarity inverts the positive output end of inverter bridge, the output filtering in output filter circuit
One end of inductance is connected with one end of output filter capacitor, and power frequency polarity inverts the negative output terminal of inverter bridge, output filtered electrical
The other end of appearance is connected with one end of power grid, and the other end of output inductor is connected with the other end of power grid；Its feature exists
In:
It further include by decoupling inductance, decoupling capacitance, decoupling diode, decoupling switch pipe and isolating transformer auxiliary winding structure
At decoupling circuit；Wherein decoupling switch pipe includes two switching tubes, and decoupling diode includes two diodes, decouples inductance
One end, decoupling capacitance negative terminal, the Same Name of Ends of isolating transformer primary side winding and the non-same polarity of auxiliary winding be connected,
The other end, the anode of the first decoupling diode and the collector of the first decoupling switch pipe for decoupling inductance are connected, the first decoupling
The emitter of switching tube is connected with the emitter of primary side switch pipe, and the cathode of the first decoupling diode, second decouple diode
The collector of cathode, the anode of decoupling capacitance and the second decoupling switch pipe is connected, the emitter of the second decoupling switch pipe and every
Same Name of Ends from transformer auxiliary winding is connected, and the anode of the second decoupling diode connects the non-same of isolating transformer primary side winding
Name end.
The utility model has the advantages that
Ripple is inputted the present invention discloses one kind zero and polarity inverts output type Miniature inverter, has decoupled DC power supply
Input side power ripple as caused by output AC power.Technical characteristics of the present invention compared with original technology are to pass through
Decoupling circuit is added in inverter input side and carrys out processing power ripple, secondary power ripple is transferred on decoupling capacitance, so that
Two double-frequency fluctuations are presented in voltage on decoupling capacitance, and secondary ripple wave component is substantially free of in input power, so as to avoid
It uses the electrolytic capacitor that volume is big, reliability is low as decoupling capacitance in Miniature inverter, extends making for Miniature inverter
With the service life, the power density of Miniature inverter is improved.
Detailed description of the invention
Attached drawing 1 is that one kind zero of the invention inputs ripple and polarity reversion output type Miniature inverter circuit structure signal
Figure.
Attached drawing 2 is that one kind zero of the invention inputs ripple and the polarity reversion further equivalent circuit of output type Miniature inverter
Figure.
3~attached drawing of attached drawing 4 is that one kind zero of the invention inputs ripple and polarity reversion two kinds of masters of output type Miniature inverter
Want work wave schematic diagram.
5~attached drawing of attached drawing 10 is that one kind zero of the invention inputs ripple and polarity inverts respectively opening for output type Miniature inverter
Close mode schematic diagram.
Primary symbols title in above-mentioned attached drawing: Vin, supply voltage.Cin, input capacitance.D1, truncation diode.S1, it is former
Side switching tube.Ld, decoupling inductance.Dd1、Dd2, decoupling diode.Cd, decoupling capacitance.Sx1、Sx2, be decoupling switch pipe.T, every
From transformer.n1, isolating transformer primary side winding.n2, isolating transformer auxiliary winding.n3, isolating transformer vice-side winding.
Lm, isolating transformer magnetizing inductance.D2, secondary side diode.Co, filter capacitor.Ss1~Ss2, be thyristor.St1~St2,
For switching tube.Lf, output inductor.Cf, output filter capacitor.vgrid, network voltage.
Specific embodiment
The technical solution of invention is described in detail with reference to the accompanying drawing:
Attached drawing 1 is that one kind zero inputs ripple and polarity reversion output type Miniature inverter structural schematic diagram.By DC power supply
Vin, input capacitance 1, truncation diode 2, primary side switch pipe 3, isolating transformer 4, secondary side diode 5, filter capacitor 6, power frequency
Polarity inverts inverter bridge 7, output filter circuit 8, power grid vgrid, decoupling inductance 9, decoupling capacitance 10, decoupling diode 11 and solution
Coupling switching tube 12 forms.CinIt is input capacitance, D1It is truncation diode, S1It is primary side switch pipe, Sx1、 Sx2It is decoupling switch pipe,
LdIt is decoupling inductance, Dd1、Dd2It is decoupling diode, CdIt is decoupling capacitance, T is isolating transformer, D2It is secondary side diode, CoIt is
Filter capacitor, Ss1~Ss2It is thyristor, St1~St2It is switching tube, LfIt is output inductor, CfIt is output filter capacitor.By
Being similar to the ideal transformer with specific magnetizing inductance in isolating transformer can be by attached drawing 1 etc. for the ease of analysis
Effect is attached circuit shown in Fig. 2.
Below with it is attached it is shown in Fig. 2 it is equivalent after main circuit structure, described in conjunction with 5~attached drawing of attached drawing 10 of the invention specific
Working principle, wherein only flyback converter operation mode is analyzed, and the working principle of power frequency polarity reversion inverter bridge is not
It repeats again.Since the input power that DC power supply provides is constant, and output power is the pulsating quantity comprising secondary ripple wave,
According to input power PinWith instantaneous output power poThe operating mode of big wisp circuit be divided into two kinds, as input power PinGreatly
In instantaneous output power poWhen, circuit works in 1 state of mode；When input power is less than instantaneous output power, circuit work
In 2 state of mode.When the inverter known to 3~attached drawing of attached drawing 4 works in mode 1 or mode 2, a switch periods Ts?
There are 4 kinds of switch mode, [t0-t1]、[t1-t2]、[t2-t3]、[t3-t4].Have below to the working condition of each switch mode
Body analysis.
Before analysis, first make the following assumptions: 1. all power devices are ideal；It is pressed in often 2. decoupling capacitance powers on
It is definite value in a HF switch period；3. the isolating transformer turn ratio are as follows: n1∶n2∶n3=1: 1: n.
The working condition of switch mode each under mode 1 is made a concrete analysis of below.
1. switching 1 [t of mode0-t1] [corresponding to attached drawing 5]
t0Moment opens primary side switch pipe S1, transformer magnetizing inductance LmStart energy storage, primary current i1Start from scratch line
Property rise.t1Moment, electric current i1Reach current reference value i1-ref, on-off switching tube S at this time1, which terminates.In this stage,
ii=i1.Current reference value i1-refIt may be expressed as:
Wherein, ω is network voltage angular frequency, TsFor switch periods, PinFor input power, Pin=VinIin。
2. switching 2 [t of mode1-t2] [corresponding to attached drawing 6]
t1Moment, secondary side diode D2It is connected, the energy in transformer magnetizing inductance passes through secondary side diode D2It is transmitted to electricity
Net, either in switch mode 2 or mode 3, when the energy stored in transformer all discharges, secondary side diode D2Stop
Work.Meanwhile decoupling switch pipe Sx1It is open-minded, decouple inductance LdBear supply voltage, electric current iLdLinear rise is to current reference
Value iLd-ref, decouple inductance LdStore energy, in this stage, ii=iLd.Electric current iiHigh fdrequency component flow through input capacitance Cin, institute
With input current for a DC quantity.Current reference value iLd-ref:
3. switching 3 [t of mode2-t3] [corresponding to attached drawing 7]
t2Moment, decoupling switch pipe Sx1Shutdown decouples inductance LdBear decoupling capacitance voltage, electric current iLdLinear decline,
Decouple inductance LdIt releases energy, decoupling capacitance CdStore energy.At this point, secondary side diode D2May work may not also work.
4. switching 4 [t of mode3-t4] [corresponding to attached drawing 8]
t3Moment decouples inductance LdUpper and secondary side diode D2On without electric current, filter capacitor CoAnd CfMaintain power grid institute
The energy needed.
The working condition of switch mode each under mode 2 is made a concrete analysis of below.
1. switching 1 [t of mode0-t1] [corresponding to attached drawing 5]
This process is identical as the switch mode 1 under mode 1, and transformer magnetizing inductance stores energy, primary current i1From zero
Start linear rise.t1Moment, electric current i1Reach current reference value ii-ref, on-off switching tube S at this time1, which terminates.Electric current
Reference value ii-refIt may be expressed as:
2. switching 2 [t of mode1-t2] [corresponding to attached drawing 9]
t1Moment opens decoupling switch pipe Sx2, decoupling capacitance voltage forward direction is added in isolating transformer auxiliary winding n2On, become
Depressor magnetizing inductance continues energy storage, thus primary current i1Continue linear rise, when it rises to current reference value i1-refWhen,
Decoupling switch pipe Sx2Shutdown, this mode terminate.
3. switching 3 [t of mode2-t3] [corresponding to attached drawing 10]
This stage, the energy being stored in isolating transformer are transmitted to power grid, secondary current i2Drop to zero.
4. switching 4 [t of mode3-t4] [corresponding to attached drawing 8]
Switch mode 4 under this process and mode 1 is consistent, filter capacitor CoAnd CfEnergy needed for power grid is provided.
From above description it is known that a kind of zero input ripple proposed by the present invention and polarity reversion output type are miniature inverse
Becoming device has the advantages that following several respects:
1) increased decoupling circuit can be effectively decoupled direct current source secondary power ripple caused by output ripple power,
It avoids in inverter input terminal using the electrolytic capacitor that volume is big, reliability is low, while decoupling capacitance is also as buffering electricity
Road absorbs leakage inductance energy.
2) decoupling circuit is simple, and what is mainly controlled in entire inverter is the peak value and transformer excitation for decoupling inductive current
The peak value of inductive current.
3) thin-film capacitor of low-capacitance can be used in the capacitor in inverter, not only increases inverter power density, also
Inverter service life is extended, the performance and efficiency of inverter are further improved.
Claims (1)
1. one kind zero inputs ripple and polarity inverts output type Miniature inverter, including DC power supply (Vin), input capacitance (1),
Diode (2), primary side switch pipe (3), isolating transformer (4), secondary side diode (5), filter capacitor (6), power frequency polarity are truncated
Invert inverter bridge (7), output filter circuit (8) and power grid (vgrid)；Wherein DC power anode, input capacitance (1) one end
It is connected with the anode of truncation diode (2), the cathode of DC power supply, the other end of input capacitance (1) and primary side switch pipe (3)
Emitter be connected；The cathode of truncation diode (2) is connected with the Same Name of Ends of isolating transformer (4) primary side winding, is isolated
The non-same polarity of transformer (4) primary side winding is connected with the collector of primary side switch pipe (3)；Power frequency polarity inverts inverter bridge
It (7) include two thyristors and two switching tubes, the connected composition power frequency of the anode of the anode of the first thyristor and the second thyristor
Polarity inverts the positive input terminal of inverter bridge (7), and the emitter of first switch tube is connected with the emitter of second switch constitutes work
Frequency polarity inverts the negative input end of inverter bridge (7), and the cathode of the first thyristor is connected with the collector of first switch tube constitutes work
Frequency polarity inverts the positive output end of inverter bridge (7), and the cathode of the second thyristor is connected with the collector of second switch constitutes work
Frequency polarity inverts the negative output terminal of inverter bridge (7), the non-same polarity and secondary side diode (5) of isolating transformer (4) vice-side winding
Anode be connected, the Same Name of Ends of isolating transformer (4) vice-side winding, one end of filter capacitor (6) and power frequency polarity reversion it is inverse
The negative input end for becoming bridge (7) is connected, the cathode of secondary side diode (5), the other end of filter capacitor (6) and the reversion of power frequency polarity
The positive input terminal of inverter bridge (7) is connected, and power frequency polarity inverts the positive output end of inverter bridge (7), in output filter circuit (8)
One end of output inductor is connected with one end of output filter capacitor, the negative output terminal of power frequency polarity reversion inverter bridge (7),
The other end of output filter capacitor is connected with one end of power grid, the other end of output inductor and the other end phase of power grid
Even；It is characterized by:
It further include by decoupling inductance (9), decoupling capacitance (10), decoupling diode (11), decoupling switch pipe (12) and isolation transformation
The decoupling circuit that device (4) auxiliary winding is constituted；Wherein decoupling switch pipe (12) includes two switching tubes, decoupling diode (11) packet
Include two diodes, the decoupling one end of inductance (9), the negative terminal of decoupling capacitance (10), isolating transformer (4) primary side winding it is of the same name
The non-same polarity of end and auxiliary winding is connected, and decouples the other end of inductance (9), the anode and the first solution of the first decoupling diode
The collector of coupling switching tube is connected, and the emitter of the first decoupling switch pipe is connected with the emitter of primary side switch pipe (3), and first
Decouple the cathode of diode, cathode, the anode of decoupling capacitance (10) and the collection of the second decoupling switch pipe of the second decoupling diode
Electrode is connected, and the emitter of the second decoupling switch pipe is connected with the Same Name of Ends of isolating transformer (4) auxiliary winding, the second decoupling
The anode of diode connects the non-same polarity of isolating transformer (4) primary side winding.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611086515.3A CN108123635B (en) | 2016-11-25 | 2016-11-25 | One kind zero inputs ripple and polarity inverts output type Miniature inverter |
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| CN201611086515.3A CN108123635B (en) | 2016-11-25 | 2016-11-25 | One kind zero inputs ripple and polarity inverts output type Miniature inverter |
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| Publication Number | Publication Date |
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| CN108123635A CN108123635A (en) | 2018-06-05 |
| CN108123635B true CN108123635B (en) | 2019-05-21 |
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| CN116565980B (en) * | 2023-07-11 | 2023-09-19 | 麦田能源股份有限公司 | Inverter system with reactive support and control method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08214551A (en) * | 1994-11-30 | 1996-08-20 | Sanken Electric Co Ltd | Dc power source |
| CN102522766A (en) * | 2011-11-04 | 2012-06-27 | 浙江大学 | Flyback type miniature photovoltaic grid connected inverter with power decoupling circuit and control method thereof |
| CN103633846A (en) * | 2012-08-22 | 2014-03-12 | 杨宏泽 | Photovoltaic converter and control method thereof |
| CN105450073A (en) * | 2016-01-15 | 2016-03-30 | 安阳师范学院 | A single-phase photovoltaic grid-connected micro-inverter |
-
2016
- 2016-11-25 CN CN201611086515.3A patent/CN108123635B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08214551A (en) * | 1994-11-30 | 1996-08-20 | Sanken Electric Co Ltd | Dc power source |
| CN102522766A (en) * | 2011-11-04 | 2012-06-27 | 浙江大学 | Flyback type miniature photovoltaic grid connected inverter with power decoupling circuit and control method thereof |
| CN103633846A (en) * | 2012-08-22 | 2014-03-12 | 杨宏泽 | Photovoltaic converter and control method thereof |
| CN105450073A (en) * | 2016-01-15 | 2016-03-30 | 安阳师范学院 | A single-phase photovoltaic grid-connected micro-inverter |
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