CN204131401U - A kind of photovoltaic DC-to-AC converter DC/DC booster circuit - Google Patents
A kind of photovoltaic DC-to-AC converter DC/DC booster circuit Download PDFInfo
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- CN204131401U CN204131401U CN201420533160.8U CN201420533160U CN204131401U CN 204131401 U CN204131401 U CN 204131401U CN 201420533160 U CN201420533160 U CN 201420533160U CN 204131401 U CN204131401 U CN 204131401U
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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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Abstract
The utility model discloses a kind of photovoltaic DC-to-AC converter DC/DC booster circuit, comprise direct-flow input end, DC output end, control circuit and two power conversion circuits, two power conversion circuit parallel connections.The input termination direct-flow input end of power conversion circuit, the output termination direct-flow input end of power conversion circuit; The control end connection control circuit pwm control signal output respectively of two power conversion circuit switch change-over devices.The utility model adopts two power conversion circuit parallel connections, and power output is large, and two power conversion circuits can phase trans-substitution, good operating stability.
Description
[technical field]
The utility model relates to DC/DC booster circuit, particularly relates to a kind of photovoltaic DC-to-AC converter DC/DC booster circuit.
[background technology]
As the core technology in solar energy development, photovoltaic combining inverter has become the hotly contested spot of numerous high-tech company in the world.In existing photovoltaic DC-to-AC converter, DC/DC boosts structure partly as shown in Figure 1, comprising having power conversion circuit, PMM control circuit, and isolation feedback circuit, sampling comparison circuit and reference voltage circuit five part.Power conversion circuit comprises metal-oxide-semiconductor Q1, Q2, Q3 and Q4.Main transformer T1 and T2, full bridge rectifier BR1, filter capacitor C1, the secondary winding N4 in transformer T2 is the winding providing power supply to the control circuit in inverter circuit, by rectifier bridge BR2 full-bridge rectification, electric capacity C2 filtering.Two three terminal regulator L7812 and L7805 are had to produce 12V and 5V voltage respectively.2 pin of transformer T1 and T2 connect the positive pole of direct current input, the negative pole of direct current input is all received in the S pole (source electrode) of metal-oxide-semiconductor Q1, Q2, Q3, Q4,1 pin of the armature winding N1 of transformer T1 connects the D pole (drain electrode) of metal-oxide-semiconductor Q1,3 pin of N2 winding connect the D pole (drain electrode) of metal-oxide-semiconductor Q2,1 pin of the armature winding N1 of transformer T2 connects the D pole (drain electrode) of metal-oxide-semiconductor Q3, and 3 pin of N2 winding connect the D pole (drain electrode) of metal-oxide-semiconductor Q4.4 pin of 5 pin and transformer T2 the level N3 winding of transformer T1 secondary winding N3 are connected, 4 pin of transformer T1 secondary winding N3 and 5 pin of T2 secondary winding N3 receive full bridge rectifier BR1 input, full bridge rectifier BR1 exports termination filter capacitor C1, exports high voltage direct current 400V.Sample circuit gathers constantly after output voltage values compares with reference voltage and delivers to pwm control circuit by isolation feedback circuit, and pwm control circuit is by adjusting the pulsewidth of pwm pulse thus realizing stable high voltage direct current 400V.
The major defect power output of this circuit is little, easily break down, less stable.
[summary of the invention]
The technical problems to be solved in the utility model is to provide that a kind of power output is large, the photovoltaic DC-to-AC converter DC/DC booster circuit of good stability.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is, a kind of photovoltaic DC-to-AC converter DC/DC booster circuit, comprises direct-flow input end, DC output end, control circuit and two power conversion circuits, two power conversion circuit parallel connections.The input termination direct-flow input end of power conversion circuit, the output termination direct-flow input end of power conversion circuit; The control end connection control circuit pwm control signal output respectively of two power conversion circuit switch change-over devices.
Above-described photovoltaic DC-to-AC converter DC/DC booster circuit, power conversion circuit comprises the first transformer, the second transformer, current rectifying and wave filtering circuit and described switch change-over device, and switch change-over device comprises 4 metal-oxide-semiconductors; The drain electrode of the first metal-oxide-semiconductor and the drain electrode of the second metal-oxide-semiconductor connect the two ends of the first transformer respectively, and the drain electrode of the 3rd metal-oxide-semiconductor and the drain electrode of the 4th metal-oxide-semiconductor connect the two ends of the second transformer respectively; The centre cap of the first transformer and the centre cap of the second transformer connect the positive pole of direct-flow input end, and the source electrode of 4 metal-oxide-semiconductors connects the negative pole of direct-flow input end; The grid connection control circuit first pwm control signal output of the first metal-oxide-semiconductor and the 3rd metal-oxide-semiconductor, the grid connection control circuit second pwm control signal output of the second metal-oxide-semiconductor and the 4th metal-oxide-semiconductor; The input of two termination current rectifying and wave filtering circuits of the first transformer secondary coil and the first transformer secondary coil series circuit, the output of two power conversion circuit current rectifying and wave filtering circuits and connect rear as described in DC output end.
Above-described photovoltaic DC-to-AC converter DC/DC booster circuit, power conversion circuit comprises low-voltage power supply circuit, and low-voltage power supply circuit comprises the second current rectifying and wave filtering circuit and voltage stabilizing circuit; Second transformer comprises the input of output termination second current rectifying and wave filtering circuit of second subprime coil, second subprime coil, and the input of the output termination voltage stabilizing circuit of the second current rectifying and wave filtering circuit, the output of voltage stabilizing circuit is the output of low-voltage power supply circuit.
Above-described photovoltaic DC-to-AC converter DC/DC booster circuit, control circuit comprises PMM control circuit, isolation feedback circuit, sampling comparison circuit, reference voltage circuit, the voltage sampling signal input termination DC output end of sampling comparison circuit, the reference voltage signal input termination reference voltage circuit of sampling comparison circuit; The output of sampling comparison circuit connects PMM control circuit by isolation feedback circuit, and the pwm control signal of PMM control circuit exports the control end of termination two power conversion circuit switch change-over devices.
The utility model photovoltaic DC-to-AC converter DC/DC booster circuit adopts two power conversion circuit parallel connections, and power output is large, and two power conversion circuits can phase trans-substitution, good operating stability.
[accompanying drawing explanation]
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is the schematic diagram of prior art photovoltaic DC-to-AC converter DC/DC booster circuit.
Fig. 2 is the schematic diagram of the utility model embodiment photovoltaic DC-to-AC converter DC/DC booster circuit.
[embodiment]
The structure of the utility model embodiment photovoltaic DC-to-AC converter DC/DC booster circuit as shown in Figure 2, comprises direct-flow input end DC INPUT+, DC INPUT-, DC output end DC400V, control circuit and two power conversion circuits, two power conversion circuit parallel connections.The input termination direct-flow input end of power conversion circuit, the output termination direct-flow input end of power conversion circuit; The control end connection control circuit pwm control signal output respectively of two power conversion circuit switch change-over devices.
First power conversion circuit comprises metal-oxide-semiconductor Q1, Q2, Q3 and Q4, main transformer T1 and T2, full bridge rectifier BR1, filter capacitor C1, 2 pin (centre cap) of transformer T1 and T2 connect the positive pole of direct current input, metal-oxide-semiconductor Q1, Q2, the negative pole of direct current input is all received in the S pole (source electrode) of Q3 and Q4, 1 pin of the armature winding N1 of transformer T1 connects the D pole (drain electrode) of metal-oxide-semiconductor Q1, 3 pin of winding N2 connect the D pole (drain electrode) of metal-oxide-semiconductor Q2, 1 pin of the armature winding N1 of transformer T2 connects the D pole (drain electrode) of metal-oxide-semiconductor Q3, 3 pin of N2 winding connect the D pole (drain electrode) of pole metal-oxide-semiconductor Q4.G pole (grid) the connection control circuit first pwm control signal pwm1 of metal-oxide-semiconductor Q1 and metal-oxide-semiconductor Q3, G pole (grid) the connection control circuit second pwm control signal pwm2 of metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q4.4 pin of 5 pin and transformer T2 the level N3 winding of the grid connection control circuit second pwm control signal output transformer T1 secondary winding N3 of the second metal-oxide-semiconductor and the 4th metal-oxide-semiconductor are connected, 4 pin of transformer T1 secondary winding N3 and 5 pin of T2 secondary winding N3 receive full bridge rectifier BR1 input, full bridge rectifier BR1 exports termination filter capacitor C1, exports high voltage direct current 400V.Secondary winding N4 in transformer T2 is the winding providing power supply to the control circuit in inverter circuit, low-voltage power supply circuit by rectifier bridge BR2 full-bridge rectification, electric capacity C3 filtering.Have two three terminal regulator L7812 and L7805 to produce 12V and 5V voltage respectively to power to control circuit.
Second power conversion comprises metal-oxide-semiconductor Q5, Q6, Q7 and Q8, main transformer T3 and T4, full bridge rectifier BR2, filter capacitor C2, 2 pin (centre cap) of transformer T3 and T4 connect the positive pole of direct current input, metal-oxide-semiconductor Q5, Q6, the negative pole of direct current input is all received in the S pole (source electrode) of Q7 and Q8, 1 pin of the armature winding N1 of transformer T3 connects the D pole (drain electrode) of metal-oxide-semiconductor Q5, 3 pin of winding N2 connect the D pole (drain electrode) of metal-oxide-semiconductor Q6, 1 pin of the armature winding N1 of transformer T4 connects the D pole (drain electrode) of metal-oxide-semiconductor Q7, 3 pin of winding N2 connect the D pole (drain electrode) of metal-oxide-semiconductor Q8.G pole (grid) the connection control circuit first pwm control signal pwm1 of metal-oxide-semiconductor Q5 and metal-oxide-semiconductor Q7, G pole (grid) the connection control circuit second pwm control signal pwm2 of metal-oxide-semiconductor Q6 and metal-oxide-semiconductor Q8.4 pin of 5 pin and transformer T4 the level N3 winding of transformer T3 secondary winding N3 are connected, 4 pin of transformer T3 secondary winding N3 and 5 pin of T4 secondary winding N3 receive full bridge rectifier BR3 input, full bridge rectifier BR3 exports termination filter capacitor C2, exports high voltage direct current 400V.Secondary winding N4 in transformer T4 is the winding providing power supply to the control circuit in inverter circuit, low-voltage power supply circuit by rectifier bridge BR4 full-bridge rectification, electric capacity C6 filtering.Have two three terminal regulator L7812 and L7805 to produce 12V and 5V respectively to power to control circuit.
The output Parallel opertation 400V direct current of rectification circuit BR1 and rectification circuit BR2.Sample circuit gathers constantly after output voltage values compares with reference voltage and delivers to pwm control circuit by isolation feedback circuit, and pwm control circuit is by adjusting the pulsewidth of pwm pulse thus realizing stable high voltage direct current 400V.Such photovoltaic DC-to-AC converter just can overcome can not export powerful problem when low-voltage direct inputs, and whole system is also more stable simultaneously.
As seen from Figure 2 the first power conversion circuit and the second power conversion circuit any one damage and all can not affect equipment and normally work, as long as derate uses.
The operation principle of photovoltaic DC-to-AC converter DC/DC boosting part is as follows; Because the present embodiment first power conversion circuit is identical with the second power conversion circuit so just only describe the operation principle of the first power conversion circuit at this.Switch MOS pipe Q1 and Q3, Q2 and Q4 encourage alternate conduction and cut-off by gate driver circuit, and input direct voltage is transformed into high frequency square wave alternating voltage.When metal-oxide-semiconductor Q1 and Q3 conducting, input direct voltage is added on the armature winding N1 of transformer T1 and T2 by metal-oxide-semiconductor Q1 and Q3.Due to the effect of transformer, the DC input voitage that metal-oxide-semiconductor Q2 and Q4 of cut-off will put on 2 times.When grid excitation disappears, metal-oxide-semiconductor Q1 and Q3 all ends.The voltage that its drain electrode applies is DC input voitage.Two secondary coil N3 windings due to transformer T1 and T2 are series connection, so when metal-oxide-semiconductor Q1 and Q3 opens simultaneously, power conversion circuit just has direct current to export; Lower half period, when metal-oxide-semiconductor Q2 and Q4 conducting, input direct voltage is added on the armature winding N2 of transformer T1 and T2 by metal-oxide-semiconductor Q2 and Q4.Therefore the DC input voitage that metal-oxide-semiconductor Q1 and Q3 ended will put on 2 times.Secondary N3 winding due to transformer T1 and T2 is series connection, so when metal-oxide-semiconductor Q2 and Q4 opens simultaneously, power conversion circuit just has direct current to export.And be two pipe cut-offs, next cycle restarts.Repeated work like this is raised to the direct current of 400V DC input voitage, the change of the 400V direct voltage exported constantly is gathered by sample circuit, sampled value deliver to reference voltage circuit relatively after deliver to pwm control circuit by isolation feedback circuit, carry out the VD of stable 400V by adjusting the pulsewidth of PWM.
Claims (4)
1. a photovoltaic DC-to-AC converter DC/DC booster circuit, comprises direct-flow input end, DC output end, power conversion circuit and control circuit, the input termination direct-flow input end of power conversion circuit, the output termination direct-flow input end of power conversion circuit; The control end connection control circuit pwm control signal output of power conversion circuit switch change-over device, it is characterized in that, described power conversion circuit is two, two power conversion circuit parallel connections; The control end connection control circuit pwm control signal output respectively of two power conversion circuit switch change-over devices.
2. photovoltaic DC-to-AC converter DC/DC booster circuit according to claim 1, is characterized in that, power conversion circuit comprises the first transformer, the second transformer, current rectifying and wave filtering circuit and described switch change-over device, and switch change-over device comprises 4 metal-oxide-semiconductors; The drain electrode of the first metal-oxide-semiconductor and the drain electrode of the second metal-oxide-semiconductor connect the two ends of the first transformer respectively, and the drain electrode of the 3rd metal-oxide-semiconductor and the drain electrode of the 4th metal-oxide-semiconductor connect the two ends of the second transformer respectively; The centre cap of the first transformer and the centre cap of the second transformer connect the positive pole of direct-flow input end, and the source electrode of 4 metal-oxide-semiconductors connects the negative pole of direct-flow input end; The grid connection control circuit first pwm control signal output of the first metal-oxide-semiconductor and the 3rd metal-oxide-semiconductor, the grid connection control circuit second pwm control signal output of the second metal-oxide-semiconductor and the 4th metal-oxide-semiconductor; The input of two termination current rectifying and wave filtering circuits of the first transformer secondary coil and the first transformer secondary coil series circuit, the output of two power conversion circuit current rectifying and wave filtering circuits and connect rear as described in DC output end.
3. photovoltaic DC-to-AC converter DC/DC booster circuit according to claim 1, it is characterized in that, power conversion circuit comprises low-voltage power supply circuit, and low-voltage power supply circuit comprises the second current rectifying and wave filtering circuit and voltage stabilizing circuit; Second transformer comprises the input of output termination second current rectifying and wave filtering circuit of second subprime coil, second subprime coil, and the input of the output termination voltage stabilizing circuit of the second current rectifying and wave filtering circuit, the output of voltage stabilizing circuit is the output of low-voltage power supply circuit.
4. photovoltaic DC-to-AC converter DC/DC booster circuit according to claim 1, it is characterized in that, control circuit comprises PMM control circuit, isolation feedback circuit, sampling comparison circuit, reference voltage circuit, the voltage sampling signal input termination DC output end of sampling comparison circuit, the reference voltage signal input termination reference voltage circuit of sampling comparison circuit; The output of sampling comparison circuit connects PMM control circuit by isolation feedback circuit, and the pwm control signal of PMM control circuit exports the control end of termination two power conversion circuit switch change-over devices.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420533160.8U CN204131401U (en) | 2014-09-16 | 2014-09-16 | A kind of photovoltaic DC-to-AC converter DC/DC booster circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420533160.8U CN204131401U (en) | 2014-09-16 | 2014-09-16 | A kind of photovoltaic DC-to-AC converter DC/DC booster circuit |
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| Publication Number | Publication Date |
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| CN204131401U true CN204131401U (en) | 2015-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420533160.8U Expired - Fee Related CN204131401U (en) | 2014-09-16 | 2014-09-16 | A kind of photovoltaic DC-to-AC converter DC/DC booster circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109951094A (en) * | 2017-12-08 | 2019-06-28 | 南京德朔实业有限公司 | Power supply device |
| US10923933B2 (en) | 2016-06-08 | 2021-02-16 | Nanjing Chervon Industry Co., Ltd. | Power station |
| US11271486B2 (en) | 2017-12-08 | 2022-03-08 | Nanjing Chervon Industry Co., Ltd. | Power supply device |
| CN117639494A (en) * | 2023-12-04 | 2024-03-01 | 山东艾诺智能仪器有限公司 | Low-loss multipath four-quadrant linear power supply and control method thereof |
-
2014
- 2014-09-16 CN CN201420533160.8U patent/CN204131401U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10923933B2 (en) | 2016-06-08 | 2021-02-16 | Nanjing Chervon Industry Co., Ltd. | Power station |
| CN109951094A (en) * | 2017-12-08 | 2019-06-28 | 南京德朔实业有限公司 | Power supply device |
| US11271486B2 (en) | 2017-12-08 | 2022-03-08 | Nanjing Chervon Industry Co., Ltd. | Power supply device |
| CN117639494A (en) * | 2023-12-04 | 2024-03-01 | 山东艾诺智能仪器有限公司 | Low-loss multipath four-quadrant linear power supply and control method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150128 Termination date: 20190916 |