CN104994642A - Protection circuit capable of preventing series and parallel LED lamp loop disconnection - Google Patents
Protection circuit capable of preventing series and parallel LED lamp loop disconnection Download PDFInfo
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- CN104994642A CN104994642A CN201510389272.XA CN201510389272A CN104994642A CN 104994642 A CN104994642 A CN 104994642A CN 201510389272 A CN201510389272 A CN 201510389272A CN 104994642 A CN104994642 A CN 104994642A
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Abstract
The invention provides a protection circuit capable of preventing series and parallel LED lamp loop disconnection. The protection circuit includes a transformer T, a bridge rectifier circuit QL, a constant current driving circuit LED-D, parallel LED lamp groups, voltage-regulator tubes DZ and current-limiting resistors R; each LED lamp group includes a plurality of LED sub-groups in series connection; a plurality of LED lamps are connected in series with one another so as to form each LED sub-group; each LED lamp group is connected in series with one current-limiting resistor R; the constant current driving circuit LED-D obtains power from the bridge rectifier circuit QL and supplies power for the LED lamp groups; and each LED sub-group is connected in parallel with one voltage-regulator tube DZ. With the protection circuit adopted, the conduction of the circuit of a while lamp group can be maintained when a certain LED lamp is open circuited, the lamp group can basically maintain constant working current and voltage, so that the service lives of the LED lamps can be prolonged, and lighting requirements in work such as check and detection of equipment such as a high-voltage cabinet and a control panel can be satisfied.
Description
Technical field
The present invention 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 present invention is exactly on the basis of above-mentioned patent, by the technology " combination " of above-mentioned patent together and add " component invention patent " that new creation technological maheup is new.
Summary of the invention
The object of the invention 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.
Technical scheme of the present invention is: the protective circuit that can prevent series and parallel LED loop from disconnecting of the present invention, 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; 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.
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 present invention has positive effect: provided by the invention can preventing is gone here and there, 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 invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
(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 the specific embodiment of the present invention; but not limitation of the present invention; person skilled in the relevant technique without departing from the spirit and scope of the present invention; 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 invention.
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; 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.
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 |
|---|---|---|---|
| CN201510389272.XA CN104994642A (en) | 2015-07-03 | 2015-07-03 | Protection circuit capable of preventing series and parallel LED lamp loop disconnection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510389272.XA CN104994642A (en) | 2015-07-03 | 2015-07-03 | Protection circuit capable of preventing series and parallel LED lamp loop disconnection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104994642A true CN104994642A (en) | 2015-10-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510389272.XA Pending CN104994642A (en) | 2015-07-03 | 2015-07-03 | Protection circuit capable of preventing series and parallel LED lamp loop disconnection |
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| CN (1) | CN104994642A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201363695Y (en) * | 2009-03-07 | 2009-12-16 | 宁波市依雷特照明电器有限公司 | LED lamp with voltage regulator tubes |
| CN202005011U (en) * | 2010-11-19 | 2011-10-05 | 深圳市活鹏实业有限公司 | LED lighting source circuit |
| CN103228076A (en) * | 2013-05-06 | 2013-07-31 | 西安发威电子科技有限公司 | Protection circuit for preventing disconnection of loop of LED lamps connected in series |
| CN204795753U (en) * | 2015-07-03 | 2015-11-18 | 江苏省电力公司常州供电公司 | Can prevent string, protection circuit of parallelly connected LED lamp return circuit disconnection |
-
2015
- 2015-07-03 CN CN201510389272.XA patent/CN104994642A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201363695Y (en) * | 2009-03-07 | 2009-12-16 | 宁波市依雷特照明电器有限公司 | LED lamp with voltage regulator tubes |
| CN202005011U (en) * | 2010-11-19 | 2011-10-05 | 深圳市活鹏实业有限公司 | LED lighting source circuit |
| CN103228076A (en) * | 2013-05-06 | 2013-07-31 | 西安发威电子科技有限公司 | Protection circuit for preventing disconnection of loop of LED lamps connected in series |
| CN204795753U (en) * | 2015-07-03 | 2015-11-18 | 江苏省电力公司常州供电公司 | Can prevent string, protection circuit of parallelly connected LED lamp return circuit disconnection |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20151021 |