CN204795753U - Can prevent string, protection circuit of parallelly connected LED lamp return circuit disconnection - Google Patents
Can prevent string, protection circuit of parallelly connected LED lamp return circuit disconnection Download PDFInfo
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- CN204795753U CN204795753U CN201520476755.9U CN201520476755U CN204795753U CN 204795753 U CN204795753 U CN 204795753U CN 201520476755 U CN201520476755 U CN 201520476755U CN 204795753 U CN204795753 U CN 204795753U
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Abstract
The utility model provides a can prevent string, protection circuit of parallelly connected LED lamp return circuit disconnection, including transformer T, bridge type rectifier circuit QL, constant -current drive circuit LED -D, the parallelly connected big group of LED lamp, stabilivolt DZ and current -limiting resistor R, each big group of LED lamp is established ties by a plurality of LED lamp and constitutes including a plurality of LED lamp group that establishes ties, every LED lamp group, every big group of LED lamp all concatenates a current -limiting resistor R, constant -current drive circuit LED -D gets electricly and gives the power supply of the big group of LED lamp from bridge type rectifier circuit QL, parallelly connected stabilivolt DZ in every LED lamp group. The utility model discloses it still to keep whole banks circuit conduction in the banks to make when indivedual LED lamps take place to open a way the trouble to thereby can make the LED banks keep invariable operating current and voltage to improve the life of LED lamp basically, satisfiedly look over and the lighting needs of during operation such as maintenance equipment such as high -voltage board and control panels.
Description
Technical field
The utility model relates to a kind of protective circuit of LED group, particularly a kind of protective circuit that can prevent series and parallel LED loop from disconnecting.
Background technology
The high-voltage cabinet intraoral illumination of existing electric substation and control flow screen intraoral illumination have generally used the LED group of energy-saving and environmental protection, long service life all instead.Lighting lamp group in lighting lamp group in high-voltage cabinet and control flow shield, does not generally open when the said equipment normally runs at ordinary times.But above-mentioned lighting lamp group must be opened when staff enters in electric substation and carries out work or check the said equipment.Above-mentioned LED illumination lamp group is that the many groups of LED groups be connected in series also can be connected in parallel on power supply and use by multiple LED series connection in groups.As long as there is a LED lamp to present the time marquis of open fault due to the other reasons such as quality problems or welding in the LED group be connected in series, its whole one group of lamp be cascaded just all does not work, this not only affects lighting, and electric current and the voltage of LED group constant power can be affected, also can affect the useful life of LED.Houselights does not work impact checking and the work such as maintenance fault or warping apparatus.Operationally cannot turn on cabinet door etc. with common mode in view of above-mentioned high voltage alive equipment and check He Change lamp, this just further increases checking and the difficulty of service work fault or warping apparatus.Although Country knows that innings publication number is the patent of CN201363695Y, CN202857035U and CN103228076A etc. provides some LED loops and disconnects protective circuit from different aspects, they do not solve " preventing the protective circuit that series and parallel LED loop disconnects ".The utility model is exactly on the basis of above-mentioned patent, by the technology " combination " of above-mentioned patent together and add " combination utility model patent " that new creation technological maheup is new.
Utility model content
The purpose of this utility model is: overcome the defect of prior art and provide one can prevent string, the protective circuit that parallel connection LED lamp loop disconnects, this protective circuit makes still can keep whole lamp group circuit turn-on when indivedual LED generation open fault in a certain lamp group, and each series-parallel LED group can be made substantially to keep constant operating current and voltage, thus improve the useful life of LED, such can Ji great Di Full foot the equipment such as high-voltage board and control flow is checked and the work such as maintenance time lighting demand, reduce to the device fails such as high-voltage board and control flow or abnormal time check and the difficulty of service work.
The technical solution of the utility model is: the protective circuit that can prevent series and parallel LED loop from disconnecting of the present utility model, and its design feature is: comprise transformer T, bridge rectifier QL, constant-current drive circuit LED-D, large group of LED, voltage-stabiliser tube DZ and current-limiting resistance R in parallel;
Large group of each LED comprises several LED groups of series connection, and each LED group is composed in series by 2 to 5 LED; Large group of each LED is all connected in series a current-limiting resistance R; External 220V AC power when the input of transformer T uses; The input of bridge rectifier QL is connected with the output of transformer T; The input of constant-current drive circuit LED-D is connected with the output of bridge rectifier QL; The positive pole of large group of the LED of each parallel connection is electrically connected with the positive pole of the output of constant-current drive circuit LED-D; One end of the current-limiting resistance R of large group of each LED serial connection is connected with the negative electricity of the output of constant-current drive circuit LED-D; A voltage-stabiliser tube DZ in parallel in each LED group; The positive pole of voltage-stabiliser tube DZ and the negative pole conllinear of LED group; The negative pole of voltage-stabiliser tube DZ and the positive pole conllinear of LED group.
Further scheme is: large group of the LED of above-mentioned parallel connection, comprises large group of two or more LED.
Further scheme is: large group of above-mentioned each LED at least comprises two or more LED group.
The utility model has positive effect: what the utility model provided can prevent string, the protective circuit that parallel connection LED lamp loop disconnects, this protective circuit makes still can keep whole lamp group circuit turn-on when indivedual LED generation open fault in a certain lamp group, and each series-parallel LED group can be made substantially to keep constant operating current and voltage, thus improve the useful life of LED, such can Ji great Di Full foot the equipment such as high-voltage board and control flow is checked and the work such as maintenance time lighting demand, reduce to the device fails such as high-voltage board and control flow or abnormal time check and the difficulty of service work.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
(embodiment 1)
See Fig. 1, the protective circuit that can prevent series and parallel LED loop from disconnecting of the present embodiment, form primarily of transformer T, bridge rectifier QL, constant-current drive circuit LED-D, large group of LED in parallel, voltage-stabiliser tube DZ and current-limiting resistance R.
Large group of each LED comprises several LED groups (as shown in dotted line frame in Fig. 1) of series connection, and each LED group is composed in series by 2 to 5 LED; Large group of each LED is all connected in series a current-limiting resistance R; External 220V AC power when the input of transformer T uses; The input of bridge rectifier QL is connected with the output of transformer T; The input of constant-current drive circuit LED-D is connected with the output of bridge rectifier QL; The positive pole of large group of the LED of each parallel connection is electrically connected with the positive pole of the output of constant-current drive circuit LED-D; One end of the current-limiting resistance R of large group of each LED serial connection is connected with the negative electricity of the output of constant-current drive circuit LED-D; A voltage-stabiliser tube DZ in parallel in each LED group; The positive pole of voltage-stabiliser tube DZ and the negative pole conllinear of LED group; The negative pole of voltage-stabiliser tube DZ and the positive pole conllinear of LED group.
Large group of LED in parallel, comprises large group of two or more LED.
Large group of each LED at least comprises two or more LED group.
In the present embodiment, large group of LED is for 3, and correspondingly current-limiting resistance R is provided with 3; Large group of each LED establishes 3 LED groups, and each LED group is become by 3 LED strip joint groups.
In the selection of voltage-stabiliser tube DZ, the reverse breakdown voltage of voltage-stabiliser tube DZ should be made slightly larger than the nominal operation total voltage value of its LED group in parallel; In the present embodiment, select for 1.1 times of the nominal operation total voltage value that the reverse breakdown voltage of voltage-stabiliser tube DZ is its LED group in parallel.
Constant-current driven chip LED-D adopts commercially available matured product.
Above embodiment is the explanation to embodiment of the present utility model; but not to restriction of the present utility model; person skilled in the relevant technique is not when departing from spirit and scope of the present utility model; can also make various conversion and change and obtain corresponding equivalent technical scheme, therefore all equivalent technical schemes all should be included into scope of patent protection of the present utility model.
Claims (3)
1. the protective circuit that can prevent series and parallel LED loop from disconnecting, is characterized in that: comprise transformer T, bridge rectifier QL, constant-current drive circuit LED-D, large group of LED, voltage-stabiliser tube DZ and current-limiting resistance R in parallel;
Large group of each LED comprises several LED groups of series connection, and each LED group is composed in series by 2 to 5 LED; Large group of each LED is all connected in series a current-limiting resistance R; External 220V AC power when the input of transformer T uses; The input of bridge rectifier QL is connected with the output of transformer T; The input of constant-current drive circuit LED-D is connected with the output of bridge rectifier QL; The positive pole of large group of the LED of each parallel connection is electrically connected with the positive pole of the output of constant-current drive circuit LED-D; One end of the current-limiting resistance R of large group of each LED serial connection is connected with the negative electricity of the output of constant-current drive circuit LED-D; A voltage-stabiliser tube DZ in parallel in each LED group; The positive pole of voltage-stabiliser tube DZ and the negative pole conllinear of LED group; The negative pole of voltage-stabiliser tube DZ and the positive pole conllinear of LED group.
2. the protective circuit that can prevent series and parallel LED loop from disconnecting according to claim 1, is characterized in that: large group of the LED of described parallel connection, comprises large group of two or more LED.
3. the protective circuit that can prevent series and parallel LED loop from disconnecting according to claim 1, is characterized in that: large group of described each LED at least comprises two or more LED group.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520476755.9U CN204795753U (en) | 2015-07-03 | 2015-07-03 | Can prevent string, protection circuit of parallelly connected LED lamp return circuit disconnection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520476755.9U CN204795753U (en) | 2015-07-03 | 2015-07-03 | Can prevent string, protection circuit of parallelly connected LED lamp return circuit disconnection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204795753U true CN204795753U (en) | 2015-11-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520476755.9U Expired - Fee Related CN204795753U (en) | 2015-07-03 | 2015-07-03 | Can prevent string, protection circuit of parallelly connected LED lamp return circuit disconnection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204795753U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104994642A (en) * | 2015-07-03 | 2015-10-21 | 江苏省电力公司常州供电公司 | Protection circuit capable of preventing series and parallel LED lamp loop disconnection |
| CN112032678A (en) * | 2020-09-02 | 2020-12-04 | 上海应用技术大学 | LED brightening lamp strip voltage distribution lamp stand |
-
2015
- 2015-07-03 CN CN201520476755.9U patent/CN204795753U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104994642A (en) * | 2015-07-03 | 2015-10-21 | 江苏省电力公司常州供电公司 | Protection circuit capable of preventing series and parallel LED lamp loop disconnection |
| CN112032678A (en) * | 2020-09-02 | 2020-12-04 | 上海应用技术大学 | LED brightening lamp strip voltage distribution lamp stand |
| CN112032678B (en) * | 2020-09-02 | 2022-07-01 | 上海应用技术大学 | LED brightening lamp strip voltage distribution lamp stand |
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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: 20151118 |