CN203466744U - Direct-current input circuit of photovoltaic inverter - Google Patents
Direct-current input circuit of photovoltaic inverter Download PDFInfo
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- CN203466744U CN203466744U CN201320581164.9U CN201320581164U CN203466744U CN 203466744 U CN203466744 U CN 203466744U CN 201320581164 U CN201320581164 U CN 201320581164U CN 203466744 U CN203466744 U CN 203466744U
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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
Abstract
Disclosed in the utility model is a direct-current input circuit of a photovoltaic inverter. The direct-current input circuit comprises a direct-current circuit breaker, a first contactor, a second contactor, a first resistor, a second resistor, a discharge resistor, an anti-reverse diode and a bus capacitor. According to the scheme, pre charging of the bus capacitor is realized by using the second contactor, the first resistor and the second resistor, thereby prolong the service life of the bus capacitor. Meanwhile, on the basis of turning on and off of the first contactor and the second contactor, the anti-reverse diode is not in the circuit always, so that the capacity of the anti-reverse diode is small and has the low cost and low consumption and thus the needed radiator is small. In addition, the discharge resistor is connected to the circuit for discharging of the bus capacitor only when the inverter does not work, thereby reducing the loss and improving the work efficiency of the inverter.
Description
Technical field
The utility model relates to photovoltaic DC-to-AC converter field, particularly a kind of direct-flow input circuit of photovoltaic DC-to-AC converter.
Background technology
On market, the DC side circuit of most of photovoltaic DC-to-AC converter as shown in Figure 1, mainly comprises: DC circuit breaker QF1, counnter attack diode D1, discharge resistance R1 and bus capacitor C1 now.
Counnter attack diode D1: the reversal connection of inverter DC terminal positive and negative electrode, and bus capacitor C1 is while being electrochemical capacitor, prevents electrochemical capacitor blast.
Discharge resistance R1: when inverter quits work, discharge to bus capacitor.
The shortcoming of foregoing circuit is that counnter attack diode capacity is very large, and always in circuit, price, loss is large, and need to make larger radiator to diode radiating.Discharge resistance is always in circuit, and loss is large, reduces the efficiency of inverter.The shortcoming that another is very large, bus capacitor does not have preliminary filling link.When high direct voltage, often in the mode of sudden change, directly impact bus capacitor, therefore the life-span of bus capacitor is affected.
Summary of the invention
The purpose of this utility model is, a kind of direct-flow input circuit of photovoltaic DC-to-AC converter is provided, and to reduce the wastage, extends the life-span of bus capacitor, improves the operating efficiency of inverter.
The utility model embodiment provides a kind of direct-flow input circuit of photovoltaic DC-to-AC converter, and this direct-flow input circuit comprises:
There is the DC circuit breaker of the first main contacts and the second main contacts, first contactor with the 3rd main contacts, the 4th main contacts and the first auxiliary contact, second contactor with the 5th main contacts, the 6th main contacts and the second auxiliary contact, the first resistance, the second resistance, discharge resistance, counnter attack diode and bus capacitor;
Wherein, one end of the first main contacts is connected with the positive pole of photo-voltaic power supply input, the other end of the first main contacts is connected with one end of the 3rd main contacts, the other end of the 3rd main contacts is connected with one end anodal and the first auxiliary contact of bus capacitor, one end of the second main contacts is connected with the negative pole of photo-voltaic power supply input, the other end of the second main contacts is connected with one end of the 4th main contacts, and the negative pole of the 4th other end of main contacts and one end of discharge resistance and bus capacitor is connected;
The anode of counnter attack diode is connected between the first main contacts and the 3rd main contacts, the negative electrode of counnter attack diode is connected with one end of the first resistance, the other end of the first resistance is connected with one end of the 5th main contacts, the other end of the 5th main contacts is connected between the 3rd main contacts and the first auxiliary contact, one end of the second resistance is connected between the second main contacts and the 4th main contacts, the other end of the second resistance is connected with one end of the 6th main contacts, the 6th other end of main contacts and one end of discharge resistance are connected, the other end of discharge resistance is connected with one end of the second auxiliary contact, the other end of the second auxiliary contact is connected with the other end of the first auxiliary contact,
Main contacts is normally opened contact, and auxiliary contact are normally-closed contact.
Preferably, bus capacitor is Cell bus bars electric capacity.
Preferably, bus capacitor is thin-film capacitor.
Preferably, direct-flow input circuit also comprises:
Contactor control circuit, is connected with the second contactor with the first contactor, for controlling the on off state of the first contactor and the second contactor.
Preferably, direct-flow input circuit also comprises:
The first direct voltage sample circuit and the second direct voltage sample circuit;
The first direct voltage sample circuit is connected between the positive and negative electrode of photo-voltaic power supply, for the voltage to photo-voltaic power supply, samples;
The second direct voltage sample circuit is connected between the positive and negative electrode of bus capacitor, for the voltage to bus capacitor, samples.
Preferably, contactor control circuit, the first direct voltage sample circuit and the second direct voltage sample circuit are integrated in digital signal processor.
The beneficial effects of the utility model are:
In the utility model, by the first resistance, the second resistance and the second contactor, realize the preliminary filling to bus capacitor, extended the life-span of bus capacitor.Simultaneously, in the utility model, counnter attack diode is only opened at the main contacts of the first contactor, when the main contacts of the second contactor is closed just in place in circuit, therefore it can be always in circuit, thereby makes the counnter attack diode capacity that needs little, and price is low, loss is low, and the radiator needing is also smaller.In addition, discharge resistance in the utility model is not only when inverter is worked, and the main contacts of the main contacts of the first contactor and the second contactor is opened and is, just place in circuit discharges to bus capacitor, thereby reduced loss, improved the operating efficiency of inverter.
Accompanying drawing explanation
Fig. 1 is the direct-flow input circuit schematic diagram of photovoltaic DC-to-AC converter of the prior art;
Fig. 2 is the direct-flow input circuit schematic diagram of the photovoltaic DC-to-AC converter of the utility model one embodiment;
Fig. 3 is the direct-flow input circuit schematic diagram of the photovoltaic DC-to-AC converter of the utility model one embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is clearly and completely described, obviously, described embodiment is only the utility model part embodiment, rather than whole embodiment.Embodiment based in the utility model, those of ordinary skills are not making the every other embodiment obtaining under creative work prerequisite, all belong to the scope of the utility model protection.
The utility model provides a kind of direct-flow input circuit of photovoltaic DC-to-AC converter, specifically comprises:
DC circuit breaker QF2, the first contactor KM21 with the 3rd main contacts, the 4th main contacts and the first auxiliary contact, the second contactor KM22 with the 5th main contacts, the 6th main contacts and the second auxiliary contact, the first resistance R 21, the second resistance R 22, discharge resistance R23, counnter attack diode D2 and the bus capacitor C2 with the first main contacts and the second main contacts.
This circuit specifically as shown in Figure 2, one end Q1-11 of the first main contacts is connected with the anodal PV+ of photo-voltaic power supply input, the other end Q1-12 of the first main contacts is connected with one end of the 3rd main contacts K1-11, the other end K1-12 of the 3rd main contacts is connected with one end anodal and the first auxiliary contact K1-31 of bus capacitor C2, one end of the second main contacts Q1-21 is connected with the negative pole PV-of photo-voltaic power supply input, the other end Q1-22 of the second main contacts is connected with one end K1-21 of the 4th main contacts, the other end K1-22 of the 4th main contacts is connected with the negative pole of one end of discharge resistance R23 and bus capacitor C2.
The anode of counnter attack diode D2 is connected between the first main contacts and the 3rd main contacts, between the concrete Q1-12 that is connected on the first main contacts and the K1-11 of the 3rd main contacts.The negative electrode of counnter attack diode D2 is connected with one end of the first resistance R 21, the other end of the first resistance R 21 is connected with one end K2-11 of the 5th main contacts, the other end K2-12 of the 5th main contacts is connected between the 3rd main contacts and the first auxiliary contact, between the concrete K1-12 that is connected to the 3rd main contacts and the K1-31 of the first auxiliary contact.One end of the second resistance R 22 is connected between the second main contacts and the 4th main contacts, between the concrete Q1-22 that is connected to the second main contacts and the K1-21 of the 4th main contacts.The other end of the second resistance R 22 is connected with one end K2-21 of the 6th main contacts, the other end K2-22 of the 6th main contacts is connected with one end of discharge resistance R23, the other end of discharge resistance R23 is connected with one end K2-31 of the second auxiliary contact, and the other end K2-32 of the second auxiliary contact is connected with the other end K1-31 of the first auxiliary contact.
Above-mentioned main contacts (the first main contacts to the six main contactss) is normally opened contact, and above-mentioned auxiliary contact (the first auxiliary contact, the second auxiliary contact) are normally-closed contact.
In the utility model, above-mentioned bus capacitor can be Cell bus bars electric capacity, can be also thin-film capacitor.
For the first contactor and the second contactor are controlled, in the utility model, direct-flow input circuit also comprises:
Contactor control circuit, is connected with the second contactor with the first contactor, for controlling the on off state of the first contactor and the second contactor.
In foregoing circuit, when inverter is started, also need to monitor the voltage at photo-voltaic power supply and bus capacitor two ends.For this reason, direct-flow input circuit also comprises:
The first direct voltage sample circuit and the second direct voltage sample circuit;
The first direct voltage sample circuit is connected between the positive and negative electrode of photo-voltaic power supply, for the voltage to photo-voltaic power supply, samples.
The second direct voltage sample circuit is connected between the positive and negative electrode of bus capacitor, for the voltage to bus capacitor, samples.
As shown in Figure 3, contactor control circuit, the first direct voltage sample circuit and the second direct voltage sample circuit can be integrated in DSP(digital singnal processor digital signal processor) in.
Below the operation principle of foregoing circuit is introduced:
Monitor the voltage of the first direct voltage sample circuit sampling in the start-up point of design, closed KM22, now the normally opened contact of KM22 the 5th main contacts and the 6th main contacts are closed, electric capacity starts charging, the voltage that the second direct voltage sample circuit samples rises since 0, when rising to the electrical voltage point of design, precharge completes.Closed KM21, now the normally opened contact of KM21 the 3rd main contacts and the 4th main contacts are closed, disconnect KM22, and inverter direct-flow side has started.
Because many precharge links of bus capacitor, direct voltage, no longer directly impacts electric capacity in the mode of sudden change, and the life-span of electric capacity is extended.
In the utility model, for avoiding the delay of signal, can, at closed KM21 after 5 seconds, disconnect KM22.
In foregoing circuit, after inverter direct-flow side has started, KM21 is closed, and KM22 disconnects, and the electric current that counnter attack diode D2 flows through and the voltage at two ends are zero.Be that counnter attack diode D2 only disconnects at KM21, place in circuit when KM22 is closed, relative prior art, the capacity needing is little, and price is low, and the loss of its generation is low, and the radiator needing is also very little.
Charging resistor R23 only disconnects at KM21, KM22 simultaneously, and when namely inverter disconnects, just place in circuit, supplies capacitor discharge, and its loss is little, has improved the efficiency of inverter.
Above-described specific embodiment, the purpose of this utility model, technical scheme and beneficial effect are further described, institute it should be noted, the foregoing is only a specific embodiment of the present utility model, those skilled in the art can carry out various changes and modification and not depart from spirit and scope of the present utility model the utility model.Like this, if within of the present utility model these are revised and modification belongs to the scope of the utility model claim and equivalent technologies thereof, the utility model is also intended to comprise these changes and interior.
Claims (6)
1. a direct-flow input circuit for photovoltaic DC-to-AC converter, is characterized in that, described direct-flow input circuit comprises:
There is the DC circuit breaker of the first main contacts and the second main contacts, first contactor with the 3rd main contacts, the 4th main contacts and the first auxiliary contact, second contactor with the 5th main contacts, the 6th main contacts and the second auxiliary contact, the first resistance, the second resistance, discharge resistance, counnter attack diode and bus capacitor;
Wherein, one end of described the first main contacts is connected with the positive pole of described photo-voltaic power supply input, the other end of described the first main contacts is connected with one end of described the 3rd main contacts, the other end of described the 3rd main contacts is connected with one end anodal and described the first auxiliary contact of described bus capacitor, one end of described the second main contacts is connected with the negative pole of described photo-voltaic power supply input, the other end of described the second main contacts is connected with one end of described the 4th main contacts, the negative pole of described the 4th other end of main contacts and one end of described discharge resistance and described bus capacitor is connected,
The anode of described counnter attack diode is connected between described the first main contacts and described the 3rd main contacts, the negative electrode of described counnter attack diode is connected with one end of described the first resistance, the other end of described the first resistance is connected with one end of described the 5th main contacts, the other end of described the 5th main contacts is connected between described the 3rd main contacts and described the first auxiliary contact, one end of described the second resistance is connected between described the second main contacts and described the 4th main contacts, the other end of described the second resistance is connected with one end of described the 6th main contacts, described the 6th other end of main contacts and one end of described discharge resistance are connected, the other end of described discharge resistance is connected with one end of described the second auxiliary contact, the other end of described the second auxiliary contact is connected with the other end of described the first auxiliary contact,
Described main contacts is normally opened contact, and described auxiliary contact are normally-closed contact.
2. direct-flow input circuit as claimed in claim 1, is characterized in that, described bus capacitor is Cell bus bars electric capacity.
3. direct-flow input circuit as claimed in claim 1, is characterized in that, described bus capacitor is thin-film capacitor.
4. direct-flow input circuit as claimed in claim 1, is characterized in that, described direct-flow input circuit also comprises:
Contactor control circuit, is connected with described the second contactor with described the first contactor, for controlling the on off state of described the first contactor and described the second contactor.
5. direct-flow input circuit as claimed in claim 4, is characterized in that, described direct-flow input circuit also comprises:
The first direct voltage sample circuit and the second direct voltage sample circuit;
Described the first direct voltage sample circuit is connected between the positive and negative electrode of described photo-voltaic power supply, for the voltage to described photo-voltaic power supply, samples;
Described the second direct voltage sample circuit is connected between the positive and negative electrode of described bus capacitor, for the voltage to described bus capacitor, samples.
6. direct-flow input circuit as claimed in claim 5, is characterized in that, described contactor control circuit, described the first direct voltage sample circuit and the second direct voltage sample circuit are integrated in digital signal processor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320581164.9U CN203466744U (en) | 2013-09-18 | 2013-09-18 | Direct-current input circuit of photovoltaic inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320581164.9U CN203466744U (en) | 2013-09-18 | 2013-09-18 | Direct-current input circuit of photovoltaic inverter |
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| Publication Number | Publication Date |
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| CN203466744U true CN203466744U (en) | 2014-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320581164.9U Expired - Fee Related CN203466744U (en) | 2013-09-18 | 2013-09-18 | Direct-current input circuit of photovoltaic inverter |
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| CN (1) | CN203466744U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104092362A (en) * | 2014-07-15 | 2014-10-08 | 中国兵器工业第二0八研究所 | DCDC power supply protection circuit of electric automobile |
| CN104158154A (en) * | 2014-09-01 | 2014-11-19 | 阳光电源股份有限公司 | Photovoltaic inverter and protection device of photovoltaic inverter |
| CN107171581A (en) * | 2016-03-03 | 2017-09-15 | 通用汽车环球科技运作有限责任公司 | Equipment for making high-voltage bus discharge |
| CN107645263A (en) * | 2016-07-20 | 2018-01-30 | 湖南中车时代电动汽车股份有限公司 | Electric machine controller |
| WO2022110026A1 (en) * | 2020-11-27 | 2022-06-02 | 威刚科技股份有限公司 | Motor drive system |
-
2013
- 2013-09-18 CN CN201320581164.9U patent/CN203466744U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104092362A (en) * | 2014-07-15 | 2014-10-08 | 中国兵器工业第二0八研究所 | DCDC power supply protection circuit of electric automobile |
| CN104158154A (en) * | 2014-09-01 | 2014-11-19 | 阳光电源股份有限公司 | Photovoltaic inverter and protection device of photovoltaic inverter |
| CN104158154B (en) * | 2014-09-01 | 2017-10-27 | 阳光电源股份有限公司 | Photovoltaic DC-to-AC converter and its protection device |
| CN107171581A (en) * | 2016-03-03 | 2017-09-15 | 通用汽车环球科技运作有限责任公司 | Equipment for making high-voltage bus discharge |
| CN107645263A (en) * | 2016-07-20 | 2018-01-30 | 湖南中车时代电动汽车股份有限公司 | Electric machine controller |
| WO2022110026A1 (en) * | 2020-11-27 | 2022-06-02 | 威刚科技股份有限公司 | Motor drive system |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140305 Termination date: 20150918 |
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| EXPY | Termination of patent right or utility model |