CN202364113U - Power supply device of photovoltaic grid-connected inverter and photovoltaic grid-connected inverter - Google Patents
Power supply device of photovoltaic grid-connected inverter and photovoltaic grid-connected inverter Download PDFInfo
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- CN202364113U CN202364113U CN 201120462997 CN201120462997U CN202364113U CN 202364113 U CN202364113 U CN 202364113U CN 201120462997 CN201120462997 CN 201120462997 CN 201120462997 U CN201120462997 U CN 201120462997U CN 202364113 U CN202364113 U CN 202364113U
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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 power supply device of a photovoltaic grid-connected inverter. The power supply device comprises a first power supply, a second power supply and a power supply selecting circuit, wherein the first power supply is an alternating current-direct current (AD-DC) converter; the second power supply is a DC-DC converter; a positive output end of the first power supply is connected with a positive output end of the second power supply to form a positive output end of the power supply device; a negative output end of the first power supply is connected with a negative output end of the second power supply to form a negative output end of the power supply device. The utility model also discloses a photovoltaic grid-connected inverter which uses the power supply device as an auxiliary power supply. Compared with the prior art, the power supply device and the photovoltaic grid-connected inverter have the advantage of high safety and reliability and low requirements on components.
Description
Technical field
The utility model relates to a kind of power supply, relates in particular to a kind of electric supply installation of photovoltaic combining inverter and uses the photovoltaic combining inverter of this electric supply installation as accessory power supply.
Background technology
Present photovoltaic combining inverter DC input voitage wide ranges; And the inverter accessory power supply is the important component part of inverter; Need to give each control circuit power supply, guarantee photovoltaic inversion device operate as normal, so just require in the photovoltaic combining inverter operating voltage of accessory power supply wideer.Power supply with the contactor that is incorporated into the power networks is an example, the method for supplying power to of the control coil of the contactor that is incorporated into the power networks in the present photovoltaic combining inverter, and relatively more commonly used has two kinds.First kind is that the 24V direct current obtains from dc bus through Switching Power Supply with the control of 24V direct current; Second kind is that 220V or 380V power taking are in electrical network with 220V or the control of 380V alternating current.The shortcoming that first method exists is; Because the rated current of the contactor that is incorporated into the power networks that in the high power contravariant device, uses is bigger, (200W-500W) is bigger for instantaneous power during the control coil adhesive, keeps power (several watts to tens watts) very little; Therefore require the power output of Switching Power Supply just very big; Like independent employing Switching Power Supply power supply, then concerning the design Switching Power Supply, very high requirement has been proposed, need moment that the power output of 200W-500W is provided; The direct voltage wide ranges is relatively more difficult to the components and parts type selecting so simultaneously.The defective that second method exists is; Because AC network is taken from the power supply of contactor coil, when AC network generation low-voltage is passed through (maximum duration reaches 625ms), the contactor coil that is incorporated into the power networks can be owing to undertension discharges; Inverter is quit work; Pass through if low-voltage frequently takes place electrical network, also can cause inverter frequently to stop to start, reduced the reliability and stability of system.
The utility model content
The utility model technical problem to be solved is to overcome the deficiency of existing photovoltaic combining inverter accessory power supply, and a kind of electric supply installation and photovoltaic combining inverter of photovoltaic combining inverter is provided, and can be photovoltaic combining inverter reliable and stable power supply is provided.
The be incorporated into the power networks electric supply installation of contactor of the photovoltaic combining inverter of the utility model comprises first power supply, second source, and power selection circuit; Said first power supply is the AC-DC converter, and said second source is the DC-DC converter; The positive output end of first power supply and the positive output end of second source are connected to form the positive output end of electric supply installation, and the negative output terminal of first power supply and the negative output terminal of second source are connected to form the negative output terminal of electric supply installation.
As a preferred version of the utility model, said power selection circuit comprises two counnter attack diodes that are series at respectively in first power supply, the second source place branch road.Thereby can prevent not produce short circuit simultaneously when first power supply and the second source voltage of parallel connection.
As another preferred version of the utility model, said power selection circuit comprises: first to the 5th resistance, first diode, second diode, relay, comparator, triode; The positive output end of first power supply is connected to the positive pole of first diode, and the negative pole of first diode is connected to the positive output end of electric supply installation, and the negative output terminal of first power supply is connected to the negative output terminal of electric supply installation; The positive output end of second source is connected to a wherein end of relay coil, is connected with contact of relay simultaneously, and the negative output terminal of second source is connected to the negative output terminal of electric supply installation; Another contact of relay is connected with the positive output end of electric supply installation; The other end of relay coil is connected to an end of the 5th resistance and the collector electrode of triode; The other end of the 5th resistance is connected to the base stage of triode; The emitter of triode is connected to the negative output terminal of electric supply installation, and the 4th resistance is connected between the base stage and emitter of triode, and the positive input terminal of comparator is connected with the positive output end of second source and the negative output terminal of electric supply installation through second resistance, the 3rd resistance respectively; The negative input end of comparator is connected to the positive output end of first power supply through first resistance, and the output of comparator is connected to the base stage of triode.
The photovoltaic combining inverter of the utility model comprises accessory power supply, and said accessory power supply is the said electric supply installation of above-mentioned arbitrary technical scheme; The input of said first power supply inserts electrical network, and the input of said second source inserts dc bus.
Compared with prior art, the utlity model has following superiority:
1, because the utility model can keep attracting state power demand loading power to design Switching Power Supply (second source) according to contactor, so the switch power making is required to have reduced, the type selecting of being convenient to device like this is convenient, reduces cost simultaneously.
2, because the existence of first power supply has solved the big problem of accessory power supply moment power output when being incorporated into the power networks the contactor adhesive.
3, when inverter normally is incorporated into the power networks, because the existence of Switching Power Supply, even electrical network generation low-voltage is passed through (625ms) phenomenon, the contactor that is incorporated into the power networks can not discharge yet, and has improved the stability and the reliability of inverter.
Description of drawings
Fig. 1 is the electric supply installation principle schematic of the utility model;
Fig. 2 is the circuit diagram of a kind of preferred version of electric supply installation of the utility model;
Fig. 3 is the circuit diagram of the another kind of preferred version of electric supply installation of the utility model.
Embodiment
Be elaborated below in conjunction with the technical scheme of accompanying drawing to the utility model:
The utility model thinking of the utility model is as shown in Figure 1; Be to utilize the power supply of two-way parallel connection as accessory power supply as photovoltaic DC-to-AC converter; Wherein one the road from the dc bus power taking, and another road is from the electrical network power taking, thereby overcomes the existing deficiency of the single power supply of prior art.
Fig. 2 has shown an embodiment of the utility model; The contactor that is incorporated into the power networks that with the operating voltage is 24V is an example; As shown in the figure; The positive output end 24V1 of first power supply is connected to the positive pole of counnter attack diode D1, and the negative pole of counnter attack diode D1 is connected to the positive output end 24V of electric supply installation, and the negative output terminal 24V1G of first power supply is connected to the negative output terminal 24VG of electric supply installation; The positive output end 24V2 of second source is connected to the positive pole of diode D2, and the negative pole of diode D2 is connected to the positive output end 24V of electric supply installation, and the negative output terminal 24V2G of second source is connected to the negative output terminal 24VG of electric supply installation.First power supply is the AC-DC converter, and its input incoming transport electrical network can convert ac grid voltage into the contactor work of being incorporated into the power networks required 24V direct current; Second source is the DC-DC transducer, and its input inserts dc bus, can convert DC bus-bar voltage into the 24V direct current; Positive output end 24V, the negative output terminal 24VG of electric supply installation connect the contactor coil two ends of being incorporated into the power networks respectively.
When photovoltaic combining inverter started, the required instantaneous power of the contactor adhesive of being incorporated into the power networks can be provided by first power supply and second source simultaneously, the reliable adhesive of the contactor that guarantees to be incorporated into the power networks.When inverter is incorporated into the power networks; Contactor is kept attracting state, because the power output of second source enough keeps in touch the reliable adhesive of device and the operation of other loads such as DC fan, so even line voltage generation low-voltage is passed through phenomenon; First electric power output voltage descends; Contactor can not discharge yet, and inverter is quit work or frequent start-stop, has improved the reliability and stability of photovoltaic combining inverter like this.
Fig. 3 has shown another embodiment of the utility model, still is that the contactor that is incorporated into the power networks of 24V is example with the operating voltage, and is as shown in the figure; It also comprises adaptive power supply selection circuit (shown in frame of broken lines among the figure); This circuit comprises: resistance R 1, R2, R3, R4, R5, diode D1, D2, relay K 1; Comparator U1C, triode Q1.The positive output end 24V1 of first power supply is connected to the positive pole of diode D1, and the negative pole of diode D1 is connected to the positive output end 24V of electric supply installation, and the negative output terminal 24V1G of first power supply is connected to the negative output terminal 24VG of electric supply installation; The positive output end 24V2 of second source is connected to a wherein end of relay K 1 coil, is connected with a contact of relay K 1 simultaneously, and the negative output terminal 24V2G of second source is connected to the negative output terminal 24VG of electric supply installation; Another contact of relay K 1 is connected with the positive output end 24V of electric supply installation; The other end of relay K 1 coil is connected to an end of resistance R 5 and the collector electrode of triode Q1; The other end of resistance R 5 is connected to the base stage of triode Q1; The emitter of triode Q1 is connected to the negative output terminal 24VG of electric supply installation; Resistance R 4 is connected between the base stage and emitter of triode Q1, and the positive input terminal of comparator U1C is connected with the positive output end 24V2 of second source and the negative output terminal 24VG of electric supply installation through resistance R 2, resistance R 3 respectively, and U1C provides reference voltage for comparator; The negative input end process resistance R 1 of comparator U1C is connected to the positive output end 24V1 of first power supply, and the output of comparator U1C is connected to the base stage of triode Q1, the adhesive of control relay K1.Wherein first power supply is the AC-DC converter, and its input incoming transport electrical network can convert ac grid voltage into the contactor work of being incorporated into the power networks required 24V direct current; Second source is the DC-DC transducer, and its input inserts dc bus, can convert DC bus-bar voltage into the 24V direct current; Positive output end 24V, the negative output terminal 24VG of electric supply installation connect the contactor coil two ends of being incorporated into the power networks respectively.In this circuit, resistance R 1 plays the effect of current limliting, and resistance R 2, R3 are divider resistances; Produce a reference voltage that is lower than 24V, the effect of comparator U1C is the amplitude of gathering 24V1, and 24V1 drops to the comparator output signal of back below the reference voltage; Drive triode Q1 conducting, resistance R 4, R5 are the biasing resistors of triode Q1, after the triode Q1 conducting; Control relay K1 adhesive, the 24V power supply of exporting after the K1 adhesive is provided by second source, and diode D2 is the fly-wheel diode of relay K 1 coil; Prevent when K1 discharges, to damage other devices, the effect of diode D1 is to isolate two power supplys to influence each other.
When photovoltaic combining inverter started, relay K 1 was an open mode, and to being incorporated into the power networks contactor power supply, the required bigger instantaneous power of the contactor adhesive of being incorporated into the power networks is not provided by the first power supply 24V1 second source 24V2, the reliable adhesive of the contactor that guarantees to be incorporated into the power networks.When inverter was incorporated into the power networks, the contactor that is incorporated into the power networks was kept attracting state, and power demand is less, passed through phenomenon like line voltage generation low-voltage; Power network signal produces falling of the longest 625ms, and at this moment the first power supply 24V1 also can fall and descends with power network signal, after voltage drops to R2, R3 partial pressure value, and the upset of comparator U1C signal; The output high level drives triode Q1 conducting, control relay K1 adhesive after the triode Q1 conducting; At this moment the 24V out-put supply is provided by second source 24V2, and diode D1 ends, and prevents to influence the first power supply 24V1; Guaranteed the reliability and stability of combining inverter, after line voltage recovered normally, the voltage of 24V1 was higher than the partial pressure value of R2, R3; At this moment comparator U1C upset output low level is turn-offed triode Q1, release relay K1; At this moment the 24V power up provides to the first power supply 24V1, and second source 24V2 power output is very little simultaneously, has prolonged the life-span of second source 24V2.
Claims (4)
1. the electric supply installation of a photovoltaic combining inverter is characterized in that, comprises first power supply, second source, and power selection circuit; Said first power supply is the AC-DC converter, and said second source is the DC-DC converter; The positive output end of first power supply and the positive output end of second source are connected to form the positive output end of electric supply installation, and the negative output terminal of first power supply and the negative output terminal of second source are connected to form the negative output terminal of electric supply installation.
2. the electric supply installation of photovoltaic combining inverter according to claim 1 is characterized in that, said power selection circuit comprises two counnter attack diodes that are series at respectively in first power supply, the second source place branch road.
3. the electric supply installation of photovoltaic combining inverter according to claim 1 is characterized in that said power selection circuit comprises: first to the 5th resistance, first diode, second diode, relay, comparator, triode; The positive output end of first power supply is connected to the positive pole of first diode, and the negative pole of first diode is connected to the positive output end of electric supply installation, and the negative output terminal of first power supply is connected to the negative output terminal of electric supply installation; The positive output end of second source is connected to a wherein end of relay coil, is connected with contact of relay simultaneously, and the negative output terminal of second source is connected to the negative output terminal of electric supply installation; Another contact of relay is connected with the positive output end of electric supply installation; The other end of relay coil is connected to an end of the 5th resistance and the collector electrode of triode; The other end of the 5th resistance is connected to the base stage of triode; The emitter of triode is connected to the negative output terminal of electric supply installation, and the 4th resistance is connected between the base stage and emitter of triode, and the positive input terminal of comparator is connected with the positive output end of second source and the negative output terminal of electric supply installation through second resistance, the 3rd resistance respectively; The negative input end of comparator is connected to the positive output end of first power supply through first resistance, and the output of comparator is connected to the base stage of triode.
4. a photovoltaic combining inverter comprises accessory power supply, it is characterized in that, said accessory power supply is each said electric supply installation of claim 1-3; The input of said first power supply inserts electrical network, and the input of said second source inserts dc bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120462997 CN202364113U (en) | 2011-11-21 | 2011-11-21 | Power supply device of photovoltaic grid-connected inverter and photovoltaic grid-connected inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120462997 CN202364113U (en) | 2011-11-21 | 2011-11-21 | Power supply device of photovoltaic grid-connected inverter and photovoltaic grid-connected inverter |
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| Publication Number | Publication Date |
|---|---|
| CN202364113U true CN202364113U (en) | 2012-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120462997 Expired - Lifetime CN202364113U (en) | 2011-11-21 | 2011-11-21 | Power supply device of photovoltaic grid-connected inverter and photovoltaic grid-connected inverter |
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| Country | Link |
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| CN (1) | CN202364113U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386757A (en) * | 2011-11-21 | 2012-03-21 | 常熟开关制造有限公司(原常熟开关厂） | Power supply device for photovoltaic grid-connected inverter and photovoltaic grid-connected inverter |
| CN111863529A (en) * | 2019-06-17 | 2020-10-30 | 李正庭 | Electricity-saving contactor |
-
2011
- 2011-11-21 CN CN 201120462997 patent/CN202364113U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386757A (en) * | 2011-11-21 | 2012-03-21 | 常熟开关制造有限公司(原常熟开关厂） | Power supply device for photovoltaic grid-connected inverter and photovoltaic grid-connected inverter |
| CN111863529A (en) * | 2019-06-17 | 2020-10-30 | 李正庭 | Electricity-saving contactor |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120801 |