CN203573988U - Protective circuit for photovoltaic battery pack - Google Patents
Protective circuit for photovoltaic battery pack Download PDFInfo
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- CN203573988U CN203573988U CN201320695181.5U CN201320695181U CN203573988U CN 203573988 U CN203573988 U CN 203573988U CN 201320695181 U CN201320695181 U CN 201320695181U CN 203573988 U CN203573988 U CN 203573988U
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- semiconductor
- oxide
- metal
- charge pump
- converter
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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
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a protective circuit for a photovoltaic battery pack. The protective circuit includes a charge pump, a charge pump protector, and a photovoltaic battery pack bypass switch, the charge pump protector and the photovoltaic battery pack bypass switch are electrically connected on the charge pump, the charge pump is electrically connected with the photovoltaic battery pack bypass switch, the charge pump is composed of a converter U1 and a capacitor C1, the VSS end of the converter U1 is grounded, the CPC+ end of the converter U1 is connected with one end of the capacitor C1, and the other end of the capacitor C1 is grounded. Through the cooperation of the charge pump with the charge pump protector and the photovoltaic battery pack bypass switch, the heating power consumption of a circuit can be controlled at a lower level, thereby preventing the pack from being damaged because of the heating of the circuit, and improving the reliability of the photovoltaic battery pack.
Description
Technical field
The utility model relates to photovoltaic cell field, particularly, relates to a kind of protective circuit for photovoltaic cell group.
Background technology
At present, in photovoltaic cell component Design and manufacture, for preventing that assembly is because part battery is blocked by foreign matter the damage that the hot spot effect occurring causes battery component, minimizing is due to the impact on assembly power output such as shade, need to be on the cell piece of multiple series connection bypass diode in parallel, thereby guarantee power output and the useful life of photovoltaic cell component.
Prior art is used bypass diode to make the performance of photovoltaic module and fail safe produce huge hidden danger because of heating and heat dissipation problem.
Utility model content
The purpose of this utility model is, for the problems referred to above, proposes a kind of protective circuit for photovoltaic cell group, to realize the advantage that improves photovoltaic cell component reliability.
For achieving the above object, the technical solution adopted in the utility model is:
A kind of protective circuit for photovoltaic cell group, comprise charge pump, charge pump protector and photovoltaic cell group by-pass switch, described lotus pump protector and photovoltaic cell group by-pass switch are all connected electrically on charge pump, and described charge pump is electrically connected with photovoltaic cell group by-pass switch;
Described charge pump consists of converter U1 and capacitor C 1, the power supply ground VSS end ground connection of this converter U1, and pump capacitor C PC+ end and one end of capacitor C 1 of converter U1 join, the other end ground connection of this capacitor C 1.
Further; described photovoltaic cell group by-pass switch consists of metal-oxide-semiconductor Q1 and diode D1; the source electrode of described metal-oxide-semiconductor Q1 is electrically connected with the anode of diode D1; the drain electrode of metal-oxide-semiconductor Q1 is connected with the cathodic electricity of diode D1; and the source electrode of described metal-oxide-semiconductor Q1 is electrically connected with the power supply input VIN end of above-mentioned converter U1; the drain electrode of metal-oxide-semiconductor Q1 is electrically connected with charge pump protector, and the grid of metal-oxide-semiconductor Q1 is electrically connected with the control output CTR end of converter U1.
Further; described charge pump protector is metal-oxide-semiconductor Q2; the source electrode of this metal-oxide-semiconductor Q2 is electrically connected with the power supply of above-mentioned converter U1 ground VSS end, and the grid of metal-oxide-semiconductor Q2 is electrically connected with the out-put supply VOUT end of converter U1, and the drain electrode of metal-oxide-semiconductor Q2 is electrically connected with the drain electrode of above-mentioned metal-oxide-semiconductor Q1.
The technical solution of the utility model has following beneficial effect:
The technical solution of the utility model; by charge pump, match with charge pump protector and photovoltaic cell group by-pass switch; thereby the heating power consumption of circuit is controlled to lower level, has solved because circuit heating causes damage to assembly, thereby improved photovoltaic cell component reliability.
Below by drawings and Examples, the technical solution of the utility model is described in further detail.
Accompanying drawing explanation
Fig. 1 is the electrical circuit diagram of the protective circuit for photovoltaic cell group described in the utility model embodiment;
Fig. 2 is the voltage oscillogram at the protective circuit Vctr place for photovoltaic cell group shown in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described, should be appreciated that preferred embodiment described herein is only for description and interpretation the utility model, and be not used in restriction the utility model.
As shown in Figure 1, a kind of protective circuit for photovoltaic cell group, comprise charge pump, charge pump protector and photovoltaic cell group by-pass switch, lotus pump protector and photovoltaic cell group by-pass switch are all connected electrically on charge pump, and charge pump is electrically connected with photovoltaic cell group by-pass switch;
Charge pump consists of converter U1 and capacitor C 1, the power supply ground VSS end ground connection of this converter U1, and pump capacitor C PC+ end and one end of capacitor C 1 of converter U1 join, the other end ground connection of this capacitor C 1.
Wherein, photovoltaic cell group by-pass switch consists of metal-oxide-semiconductor Q1 and diode D1; the source electrode of metal-oxide-semiconductor Q1 is electrically connected with the anode of diode D1; the drain electrode of metal-oxide-semiconductor Q1 is connected with the cathodic electricity of diode D1; and the source electrode of metal-oxide-semiconductor Q1 is electrically connected with the power supply input VIN end of above-mentioned converter U1; the drain electrode of metal-oxide-semiconductor Q1 is electrically connected with charge pump protector, and the grid of metal-oxide-semiconductor Q1 is electrically connected with the control output CTR end of converter U1.
Charge pump protector is metal-oxide-semiconductor Q2, and the source electrode of this metal-oxide-semiconductor Q2 is electrically connected with the power supply of converter U1 ground VSS end, and the grid of metal-oxide-semiconductor Q2 is electrically connected with the out-put supply VOUT end of converter U1, and the drain electrode of metal-oxide-semiconductor Q2 is electrically connected with the drain electrode of above-mentioned metal-oxide-semiconductor Q1.Metal-oxide-semiconductor Q2 is the protection tube of converter U1, when photovoltaic cell group is normally worked, turn-offs, and converter U1 is avoided because battery voltage causes damage, when battery pack photovoltaic cell group occurs when abnormal, and metal-oxide-semiconductor Q2 conducting, converter U1 normally works.
Protective circuit in the technical program is received respectively negative pole and the positive terminal of photovoltaic cell group.
Its specific works principle is as follows:
(1) as shown in Figure 2, under photovoltaic cell normal operation, the grid G of this circuit metal-oxide-semiconductor Q1 and the CTR of converter U1 end join, converter U1 is because supply voltage oppositely can not charge for its capacitor C 1, its output VOUT is equated with its power supply ground VSS terminal voltage, the gate source voltage Vgs of metal-oxide-semiconductor Q2 can not reach the threshold voltage Vth of metal-oxide-semiconductor Q2 and make metal-oxide-semiconductor Q2 in off state like this, converter U1 does not work, so metal-oxide-semiconductor Q1 is also in off state, not conducting between the anode and cathode of circuit, only has very little leakage current, when temperature 25 is spent, be less than 2uA, 125 are less than 20uA while spending.
(2) when there is hot spot effect or other situation in photovoltaic cell group, diode D1 forms forward voltage (being the junction voltage of diode), according to the at this moment voltage of normal battery and the situation of external load, voltage is generally between 0.4V ~ 1V, and metal-oxide-semiconductor Q2 relies on its body diode forward small voltage and little On current; Now, the VIN end of converter U1 obtains forward voltage with VSS end, start to charge to capacitor C 1, and along with the rising of capacitor C 1 voltage, the complete conducting of metal-oxide-semiconductor Q2, capacitor C 1 is full of electricity fast; In this stage, the CTR end of converter U1 is low level, not conducting of metal-oxide-semiconductor Q1; When capacitor C 1 is full of electricity, the control output end CTR output high level of converter U1, now metal-oxide-semiconductor Q1 conducting, the voltage of the drain-source end of metal-oxide-semiconductor Q1 just drops to approximately tens millivolts of very little values to more than 100 millivolts, the voltage that is anode tap and cathode terminal is worth for this reason, little several times to tens times during than diode current flow, and its ON time is generally greater than 95% with the ratio of turn-off time, so its average power consumption is much smaller than only using traditional bypass diode.When capacitor C 1 terminal voltage drops to certain certain value, the control end CTR end of converter U1 is turned off, output low level, and metal-oxide-semiconductor Q1 turn-offs, and now only has diode forward conducting, and converter U1 starts again to charge to capacitor C 1.So repeat, the average voltage of anode and cathode terminal is declined greatly, save electric energy, the temperature rise of circuit itself is compared with traditional bypass diode simultaneously, and temperature declines greatly, and reliability and the fail safe of device itself are greatly improved.
Work diode while being metal-oxide-semiconductor Q1 shutoff because of diode D1, electric current is larger, and leakage current is little.Metal-oxide-semiconductor Q2 in this circuit is the protection tube of converter U1; when battery pack is normally worked, turn-off, make converter U1 avoid cell voltage (being reverse high voltage to this circuit) and cause damage, battery pack occurs when abnormal; metal-oxide-semiconductor conducting, normally works converter U1.Every have a switch protection charge pump, and the voltage that utilizes diode D1 short-term operation all belongs to this rights protection scope for the scheme of charge pump charging.
Finally it should be noted that: the foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, although the utility model is had been described in detail with reference to previous embodiment, for a person skilled in the art, its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (3)
1. the protective circuit for photovoltaic cell group, it is characterized in that, comprise charge pump, charge pump protector and photovoltaic cell group by-pass switch, described lotus pump protector and photovoltaic cell group by-pass switch are all connected electrically on charge pump, and described charge pump is electrically connected with photovoltaic cell group by-pass switch;
Described charge pump consists of converter U1 and capacitor C 1, the power supply ground VSS end ground connection of this converter U1, and pump capacitor C PC+ end and one end of capacitor C 1 of converter U1 join, the other end ground connection of this capacitor C 1.
2. the protective circuit for photovoltaic cell group according to claim 1; it is characterized in that; described photovoltaic cell group by-pass switch consists of metal-oxide-semiconductor Q1 and diode D1; the source electrode of described metal-oxide-semiconductor Q1 is electrically connected with the anode of diode D1; the drain electrode of metal-oxide-semiconductor Q1 is connected with the cathodic electricity of diode D1; and the source electrode of described metal-oxide-semiconductor Q1 is electrically connected with the power supply input VIN end of above-mentioned converter U1; the drain electrode of metal-oxide-semiconductor Q1 is electrically connected with charge pump protector, and the grid of metal-oxide-semiconductor Q1 is electrically connected with the control output CTR end of converter U1.
3. the protective circuit for photovoltaic cell group according to claim 2; it is characterized in that; described charge pump protector is metal-oxide-semiconductor Q2; the source electrode of this metal-oxide-semiconductor Q2 is electrically connected with the power supply of above-mentioned converter U1 ground VSS end; the grid of metal-oxide-semiconductor Q2 is electrically connected with the out-put supply VOUT end of converter U1, and the drain electrode of metal-oxide-semiconductor Q2 is electrically connected with the drain electrode of above-mentioned metal-oxide-semiconductor Q1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320695181.5U CN203573988U (en) | 2013-11-06 | 2013-11-06 | Protective circuit for photovoltaic battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320695181.5U CN203573988U (en) | 2013-11-06 | 2013-11-06 | Protective circuit for photovoltaic battery pack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203573988U true CN203573988U (en) | 2014-04-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320695181.5U Expired - Fee Related CN203573988U (en) | 2013-11-06 | 2013-11-06 | Protective circuit for photovoltaic battery pack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203573988U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560159A (en) * | 2013-11-06 | 2014-02-05 | 无锡清莲新能源科技有限公司 | Protective circuit used for photovoltaic battery pack |
-
2013
- 2013-11-06 CN CN201320695181.5U patent/CN203573988U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103560159A (en) * | 2013-11-06 | 2014-02-05 | 无锡清莲新能源科技有限公司 | Protective circuit used for photovoltaic battery pack |
| CN103560159B (en) * | 2013-11-06 | 2016-08-24 | 无锡清莲新能源科技有限公司 | Protection circuit for photovoltaic cell group |
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Legal Events
| 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: 20140430 Termination date: 20171106 |