CN202679270U - Circuit structure of transformerless inverter with reactive compensation function - Google Patents
Circuit structure of transformerless inverter with reactive compensation function Download PDFInfo
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- CN202679270U CN202679270U CN2012202679140U CN201220267914U CN202679270U CN 202679270 U CN202679270 U CN 202679270U CN 2012202679140 U CN2012202679140 U CN 2012202679140U CN 201220267914 U CN201220267914 U CN 201220267914U CN 202679270 U CN202679270 U CN 202679270U
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- switch tube
- power switch
- power
- filter inductance
- emitter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The utility model relates to the field of a power electronic technology, and specially relates to a circuit structure of a transformerless inverter with a reactive compensation function, comprising a power switch tube S1, a power switch tube S2, a power switch tube S3, a power switch tube S4, a power switch tube S5, a power switch tube S6, a filtering inductor L1 and a filtering inductor L2. Compared to the prior art, according to the utility model, reactive compensation of a photovoltaic inverter is realized employing improved H6 single-phase inversion full bridge monopolar modulation, the loss of the switch is minimized, the efficiency is raised, and thereby the cost is reduced.
Description
Technical field
The utility model relates to electric and electronic technical field, specifically a kind of circuit structure with inverter without transformer of no-power compensation function.
Background technology
In recent years, solar energy is because the reliability that has the benefit of numerous environmental protection and economic aspect and experience all sorts of checking, thereby becomes a kind of main renewable energy resources form.The major function of conventional grid-connected photovoltaic system is to finish the control of generating electricity by way of merging two or more grid systems of photovoltaic array, and the direct current energy that is about to photovoltaic array is converted to electrical network to be presented to electrical network with the AC energy of frequency homophase.Photovoltaic array can also compensate the idle and harmonic wave in the electrical network or suppress in parallel network power generation, and then raising grid supply quality and ability, and minimizing line loss, the use of this system can be saved the investment of relevant device, widen the range of application of parallel network power generation, had vast potential for future development.
For the unidirectional transless type grid-connected photovoltaic inverter of middle low power, reactive power compensation often adopts the full-bridge circuit of bipolarity modulation to realize.But the full-bridge circuit of bipolarity modulation exists that switching loss is large, filter inductance is large, inefficient shortcoming.
Therefore the circuit structure that designs a kind of inverter without transformer with no-power compensation function that can raise the efficiency is vital.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of circuit structure of the inverter without transformer with no-power compensation function that can raise the efficiency is provided.
In order to achieve the above object, the utility model has designed a kind of circuit structure with inverter without transformer of no-power compensation function, comprise power switch tube S 1, power switch tube S 2, power switch tube S 3, power switch tube S 4, power switch tube S 5, power switch tube S 6, filter inductance L1 and filter inductance L2, it is characterized in that: be connected with the positive pole of direct current DC after the collector electrode of power switch tube S 1 is connected with the collector electrode of power switch tube S 3; The negative electrode of power diode D1 divides three the tunnel to be connected with the emitter of power switch tube S 1, the collector electrode of power switch tube S 5 and the end of filter inductance L1 respectively, the other end of filter inductance L1 is connected with the end of filter capacitor C, and the anode of power diode D1 divides two-way to be connected with the emitter of power switch tube S 6 and the collector electrode of power switch tube S 4 respectively; The negative electrode of power diode D2 divides three the tunnel to be connected with the emitter of power switch tube S 3, the collector electrode of power switch tube S 6 and the end of filter inductance L2 respectively, the other end of filter inductance L2 is connected with the other end of filter capacitor C, and the anode of power diode D2 divides two-way to be connected with the emitter of power switch tube S 5 and the collector electrode of power switch tube S 2 respectively; After being connected with the emitter of power switch tube S 4, the emitter of power switch tube S 2 is connected with the negative pole of direct current DC.
The utility model is compared with prior art, adopts the H6 single-phase inversion full-bridge unipolarity modulation of improvement to realize the photovoltaic DC-to-AC converter reactive power compensation, and switching loss is reduced, and efficient is improved, thereby has reduced cost.
Description of drawings
Fig. 1 is driving signal graph of the present utility model.
Fig. 2 is structural representation of the present utility model.
Fig. 3 is that the utility model is at the t1-t2 moment, the current circuit figure when power switch tube S 1, power switch tube S 4 and power switch tube S 6 are opened.
Fig. 4 is the utility model at t1-t2 constantly, and power switch tube S 1 and power switch tube S 4 are turn-offed the current circuit figure when power switch tube S 6 is opened.
Fig. 5 is that the utility model is at the t3-t4 moment, the current circuit figure when power switch tube S 2, power switch tube S 3 and power switch tube S 5 are opened.
Fig. 6 is the utility model at t3-t4 constantly, and power switch tube S 2 and power switch tube S 3 are turn-offed the current circuit figure when power switch tube S 5 is opened.
Embodiment
Now by reference to the accompanying drawings the utility model is described further.
Referring to Fig. 2, the utility model has designed a kind of circuit structure with inverter without transformer of no-power compensation function, comprises power switch tube S 1, power switch tube S 2, power switch tube S 3, power switch tube S 4, power switch tube S 5, power switch tube S 6, filter inductance L1 and filter inductance L2.After being connected with the collector electrode of power switch tube S 3, the collector electrode of power switch tube S 1 is connected with the positive pole of direct current DC; The negative electrode of power diode D1 divides three the tunnel to be connected with the emitter of power switch tube S 1, the collector electrode of power switch tube S 5 and the end of filter inductance L1 respectively, the other end of filter inductance L1 is connected with the end of filter capacitor C, and the anode of power diode D1 divides two-way to be connected with the emitter of power switch tube S 6 and the collector electrode of power switch tube S 4 respectively; The negative electrode of power diode D2 divides three the tunnel to be connected with the emitter of power switch tube S 3, the collector electrode of power switch tube S 6 and the end of filter inductance L2 respectively, the other end of filter inductance L2 is connected with the other end of filter capacitor C, and the anode of power diode D2 divides two-way to be connected with the emitter of power switch tube S 5 and the collector electrode of power switch tube S 2 respectively; After being connected with the emitter of power switch tube S 4, the emitter of power switch tube S 2 is connected with the negative pole of direct current DC.
Referring to Fig. 1, the utility model is finished following steps and constantly circulation successively when work:
Step 2, when t1-t2, power switch tube S 1 is switched with the high-frequency impulse width modulated pwm signal of power switch tube S 4 take identical frequency as 19.2KHz, and power switch tube S 6 is open-minded, and power switch tube S 2, power switch tube S 3 and power switch tube S 5 are turn-offed.Referring to Fig. 3, when power switch tube S 1, power switch tube S 4 and power switch tube S 6 are opened, form current circuit by direct current DC, power switch tube S 1, filter inductance L1, filter capacitor C, filter inductance L2, power switch tube S 6 and power switch tube S 4.Referring to Fig. 4, when power switch tube S 1 and power switch tube S 4 shutoffs, when power switch tube S 6 is opened, form current circuit by filter inductance L1, filter capacitor C, filter inductance L2, power switch tube S 6 and power diode D1.
Step 3, when t2-t3, power switch tube S 2, power switch tube S 5 and the power switch tube S 3 high-frequency impulse width modulated PWM take frequency as 19.2KHz switches and power switch tube S 2, power switch tube S 5 are identical with the action of power switch tube S 3, and power switch tube S 1, power switch tube S 4 and power switch tube S 6 are turn-offed.
Step 4, when t3-t4, power switch tube S 2 is switched with the high-frequency impulse width modulated pwm signal of power switch tube S 3 take identical frequency as 19.2KHz, and power switch tube S 5 is open-minded, and power switch tube S 1, power switch tube S 4 and power switch tube S 6 are turn-offed.Referring to Fig. 5, when power switch tube S 2, power switch tube S 3 and power switch tube S 5 were opened, direct current DC, power switch tube S 3, filter inductance L2, filter capacitor C, filter inductance L1, power switch tube S 5 and power switch tube S 2 formed current circuit.Referring to Fig. 6, when power switch tube S 2 and power switch tube S 3 shutoffs, when power switch tube S 5 is opened, form current circuit by filter inductance L2, filter capacitor C, filter inductance L1 and power diode D2.
In the utility model, power switch tube S 5 consists of alternating current bypass with power diode D2 and power switch tube S 6 with power diode D1, can effectively reduce the common mode leakage current.When the HF switch pipe turn-offs, power switch tube S 5 consists of alternating current bypass with power diode D2 or power switch tube S 6 with power diode D1, the filter inductance input side is 0.5Vdc to the negative voltage of DC, and bipolarity when modulation, the filter inductance input side is Vdc to the DC negative voltage, so the harmonic wave of output current is less.Owing to adopt the unipolarity modulation system, reduced the number of opening of power switch pipe, so conversion efficiency is higher, and can realize reactive power compensation.
Claims (1)
1. circuit structure with inverter without transformer of no-power compensation function, comprise power switch tube S 1, power switch tube S 2, power switch tube S 3, power switch tube S 4, power switch tube S 5, power switch tube S 6, filter inductance L1 and filter inductance L2, it is characterized in that: be connected with the positive pole of direct current DC after the collector electrode of power switch tube S 1 is connected with the collector electrode of power switch tube S 3; The negative electrode of power diode D1 divides three the tunnel to be connected with the emitter of power switch tube S 1, the collector electrode of power switch tube S 5 and the end of filter inductance L1 respectively, the other end of filter inductance L1 is connected with the end of filter capacitor C, and the anode of power diode D1 divides two-way to be connected with the emitter of power switch tube S 6 and the collector electrode of power switch tube S 4 respectively; The negative electrode of power diode D2 divides three the tunnel to be connected with the emitter of power switch tube S 3, the collector electrode of power switch tube S 6 and the end of filter inductance L2 respectively, the other end of filter inductance L2 is connected with the other end of filter capacitor C, and the anode of power diode D2 divides two-way to be connected with the emitter of power switch tube S 5 and the collector electrode of power switch tube S 2 respectively; After being connected with the emitter of power switch tube S 4, the emitter of power switch tube S 2 is connected with the negative pole of direct current DC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202679140U CN202679270U (en) | 2012-06-07 | 2012-06-07 | Circuit structure of transformerless inverter with reactive compensation function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202679140U CN202679270U (en) | 2012-06-07 | 2012-06-07 | Circuit structure of transformerless inverter with reactive compensation function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202679270U true CN202679270U (en) | 2013-01-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012202679140U Expired - Fee Related CN202679270U (en) | 2012-06-07 | 2012-06-07 | Circuit structure of transformerless inverter with reactive compensation function |
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| CN (1) | CN202679270U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485829A (en) * | 2014-12-31 | 2015-04-01 | 西安龙腾新能源科技发展有限公司 | Six-switching-tube circuit topology of non-isolated type full bridge inverter and monitoring method thereof |
-
2012
- 2012-06-07 CN CN2012202679140U patent/CN202679270U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104485829A (en) * | 2014-12-31 | 2015-04-01 | 西安龙腾新能源科技发展有限公司 | Six-switching-tube circuit topology of non-isolated type full bridge inverter and monitoring method thereof |
| CN104485829B (en) * | 2014-12-31 | 2017-08-01 | 西安龙腾新能源科技发展有限公司 | The six switching tube circuit topologies and its monitoring method of non-isolation type full-bridge inverter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130116 Termination date: 20130607 |