CN206879153U - A kind of LED circuit with current-limiting protection - Google Patents
A kind of LED circuit with current-limiting protection Download PDFInfo
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- CN206879153U CN206879153U CN201720799372.4U CN201720799372U CN206879153U CN 206879153 U CN206879153 U CN 206879153U CN 201720799372 U CN201720799372 U CN 201720799372U CN 206879153 U CN206879153 U CN 206879153U
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
A kind of LED circuit with current-limiting protection is the utility model is related to, including simulation filament, rectification circuit, LED load, sampling feedback circuit and the on-off circuit being sequentially connected, the LED circuit with current-limiting protection also include：Current-limiting circuit, it is connected respectively with the simulation filament and the rectification circuit, for limiting the output current of electric ballast in the filament analog circuit；Shunt circuit, it is connected respectively with the simulation filament and the on-off circuit, after the on-off circuit turns on, the shunt circuit forms complete loops, adjusts lamp current size；LED circuit of the present utility model with current-limiting protection is provided with automatic current limiting defencive function, makes circuit more stable safe and reliable, and circuit structure is simple, and cost is low.
Description
Technical field
The utility model belongs to circuit field, more particularly to a kind of LED circuit with current-limiting protection.
Background technology
Electric ballast has a clear superiority to improving illuminator efficiency and quality, is the new international product for recommending application,
And the trend of future development, modern fluorescent lamp is in order to save the energy, eliminate flicker, more and more using electric ballast,
It is light compact, it might even be possible to electric ballast and fluorescent tube etc. are integrated, but the compatible electronic ballast side of in the market
The circuit of case largely all have current limliting or overcurrent protection, has doing overcurrent protection and uses a kind of extreme mode, as led to
Cross resistance heating and consume unnecessary electric current to realize circuit protection, or do not declared externally directly in a manner of sacrificing compatibility simultaneous
Hold, it is all a kind of potential safety hazard and loss to user to use which kind of mode of the above.
Utility model content
In view of this, in view of the shortcomings of the prior art, the utility model is intended to provide a kind of LED electricity with current-limiting protection
Road, it can effectively solve the problem that problems of the prior art.
To achieve the above object, the utility model adopts the following technical scheme that：
A kind of LED circuit with current-limiting protection, including be sequentially connected simulation filament, rectification circuit, LED load, sampling
Feedback circuit and on-off circuit, the LED circuit with current-limiting protection also include：
Current-limiting circuit, it is connected respectively with the simulation filament and the rectification circuit, for limiting the defeated of electric ballast
Go out electric current；
Shunt circuit, it is connected respectively with the simulation filament and the on-off circuit, after the on-off circuit turns on, institute
State shunt circuit and form complete loops, adjust lamp current size.
Further, the current-limiting circuit includes：
Resistance R1, electric capacity C1, electric capacity C3 and electric capacity C4；
The resistance R1 and simulation filament parallel, described electric capacity C1 one end connect with resistance R1 one end and C3 one end respectively
Connect, the other end of the electric capacity C3 is connected with electric capacity C4 one end, the electric capacity C4 other end respectively with the electric capacity C1 other end and
Resistance R1 other end connection；By adjusting the size of electric capacity, the limitation to electric ballast output current is realized.
Further, the rectification circuit includes：
Rectification chip BR1, filter capacitor C7 and resistance R3；
No. 1 pin of the rectification chip BR1 is connected to No. 4 of rectification chip BR1 by filter capacitor C7 and resistance R3
Pin.
Further, the sampling feedback circuit is sampling resistor R4；Load current is monitored by resistance R4 and
Sampling, when electric ballast output current exceedes setting value, signal is sent to on-off circuit by sampling feedback circuit.
Further, the on-off circuit includes：
Rectification chip BR2, filter capacitor C9 and reverse blocking triode thyristor Q1；
One end of the filter capacitor C9 is connected with rectification chip BR2 No. 1 pin, the other end and the 3 of rectification chip BR2
The connection of number pin, the anode of the reverse blocking triode thyristor Q1 are connected with rectification chip BR2 No. 1 pin, negative electrode with it is whole
Flow chip BR2 No. 3 pins connection；After the on-off circuit receives the over-current signal of feedback, on-off circuit closure, do not having
Before receiving over-current signal, on-off circuit is in high-impedance state, and on-off circuit is in open-circuit condition.
Further, the shunt circuit is electric capacity C3；After on-off circuit is connected, shunt circuit forms complete loops, root
According to setting capacitance adjustment lamp current size.
Further, No. 1 pin and LED load positive pole of the described filter capacitor C7 one end respectively with rectification chip BR1 connect
Connect, the other end is connected with LED load negative pole.
The beneficial effects of the utility model comprise at least it is following some：
（1）, in the market most of compatible electronic ballast scheme do not have current limliting and overload shunting function, safety be present
Hidden danger, the utility model use automatic current limiting defencive function, make whole circuit safer.
（2）, some electric ballasts are provided with current-limiting protection circuit, but the part of overload are dissipated using calorifics form
Electric current, radiating burden is aggravated, and reduced reliability and the life-span of lamp；Output current of the utility model from electric ballast
Set out greatly, shunted using electric capacity, calorifics risk will not be produced, also do not reduce product reliability and life-span.
（3）, this programme using component it is few, circuit cost is low.
（4）, line holding space it is small, be adapted to various mini compact LED products design.
Brief description of the drawings
Fig. 1 is a kind of function structure chart of the LED circuit with current-limiting protection of the utility model；
Fig. 2 is a kind of circuit theory diagrams of the LED circuit with current-limiting protection of the utility model.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the utility model is described further：
As shown in figure 1, a kind of LED circuit with current-limiting protection include be sequentially connected simulation filament 10, current-limiting circuit 20,
Rectification circuit 30, LED load 40, sampling feedback circuit 50, on-off circuit 60 and shunt circuit 70.
As shown in Fig. 2 during the simulation 10 compatible electronic formula ballast of filament, simulation filament 10 simulates filament pre-heating shape
State, electric ballast starter is set to work；The current-limiting circuit 20 includes：Resistance R1, electric capacity C1, electric capacity C3 and electric capacity C4；It is described
Resistance R1 is connected with resistance R1 one end and C3 one end respectively with simulation filament parallel, described electric capacity C1 one end, the electric capacity
The C3 other end is connected with electric capacity C4 one end, and the electric capacity C4 other end is another with the electric capacity C1 other end and resistance R1 respectively
End connection；By adjusting the size of electric capacity, the limitation to electric ballast output current is realized.
The rectification circuit 30 includes：Rectification chip BR1, filter capacitor C7 and resistance R3；The 2 of the rectification chip BR1
Number pin is connected with the electric capacity C3 other end and electric capacity C4 one end, and No. 1 pin of the rectification chip BR1 passes through filter capacitor
C7 and resistance R3 is connected to rectification chip BR1 No. 4 pins.
No. 3 pins of the rectification chip BR1 are connected with a current-limiting circuit 20, the current-limiting circuit 20 include resistance R2,
Electric capacity C2, electric capacity C5 and electric capacity C6；The resistance R2 with simulation filament parallel, described electric capacity C2 one end respectively with resistance R2 one
End and the connection of C5 one end, the other end of the electric capacity C5 is connected with electric capacity C6 one end, the electric capacity C6 other end respectively with electricity
Hold the other end connection of the C2 other end and resistance R2；By adjusting the size of electric capacity, realize to electric ballast output current
Limitation.
The sampling feedback circuit 50 is sampling resistor R4；The on-off circuit 60 includes：Rectification chip BR2, filtered electrical
Hold C9 and reverse blocking triode thyristor Q1；One end of the resistance R4 is connected respectively to LED load positive pole, and the other end is connected to
Reverse blocking triode thyristor Q1 control pole G, the filter capacitor C9 one end are connected with rectification chip BR2 No. 1 pin,
The other end is connected with rectification chip BR2 No. 3 pins, anode A and the rectification chip BR2 of the reverse blocking triode thyristor Q1
The connection of No. 1 pin, negative electrode K is connected with rectification chip BR2 No. 3 pins；Load current is supervised by the resistance R4
Survey and sample, when electric ballast output current exceedes setting value, signal is sent to on-off circuit 60 by sampling feedback circuit 50；
After the on-off circuit 60 receives the over-current signal of feedback, on-off circuit 60 closes, and before over-current signal is not received by, opens
Powered-down road 60 is in high-impedance state, and on-off circuit 60 is in open-circuit condition.
The shunt circuit 70 is electric capacity C3；No. 2 pins of the rectification chip BR2 pass through the another of electric capacity C3 and resistance R1
One end is connected, and No. 4 pins of the rectification chip BR2 are connected with the resistance R2 other end；After on-off circuit 60 is connected, point
Current circuit 70 forms complete loops, according to setting capacitance adjustment lamp current size.
Finally it should be noted that：Above example is only to illustrate the technical solution of the utility model, rather than its limitations；
For those skilled in the art, it can still be repaiied to the technical scheme described in previous embodiment
Change, equivalent substitution either is carried out to which part or all technical characteristic；And these modifications or replacement, do not make corresponding skill
The essence of art scheme departs from the scope of protection of the utility model.
Claims (7)
1. a kind of LED circuit with current-limiting protection, including the simulation filament that is sequentially connected, rectification circuit, LED load, sampling are anti-
Current feed circuit and on-off circuit, it is characterised in that：The LED circuit with current-limiting protection also includes：
Current-limiting circuit, it is connected respectively with the simulation filament and the rectification circuit, for limiting the output electricity of electric ballast
Stream；
Shunt circuit, it is connected respectively with the simulation filament and the on-off circuit, after the on-off circuit turns on, described point
Current circuit forms complete loops, adjusts lamp current size.
A kind of 2. LED circuit with current-limiting protection as claimed in claim 1, it is characterised in that：The current-limiting circuit includes：
Resistance R1, electric capacity C1, electric capacity C3 and electric capacity C4；
The resistance R1 is connected with resistance R1 one end and C3 one end respectively with simulation filament parallel, described electric capacity C1 one end,
The other end of the electric capacity C3 is connected with electric capacity C4 one end, the electric capacity C4 other end other end and resistance with electric capacity C1 respectively
R1 other end connection.
A kind of 3. LED circuit with current-limiting protection as claimed in claim 1, it is characterised in that：The rectification circuit includes：
Rectification chip BR1, filter capacitor C7 and resistance R3；
No. 1 pin of the rectification chip BR1 is connected to rectification chip BR1 No. 4 pins by filter capacitor C7 and resistance R3.
A kind of 4. LED circuit with current-limiting protection as claimed in claim 1, it is characterised in that：The sampling feedback circuit is
Sampling resistor R4.
A kind of 5. LED circuit with current-limiting protection as claimed in claim 1, it is characterised in that：The on-off circuit includes：
Rectification chip BR2, filter capacitor C9 and reverse blocking triode thyristor Q1；
One end of the filter capacitor C9 is connected with rectification chip BR2 No. 1 pin, and No. 3 of the other end and rectification chip BR2 are drawn
Pin is connected, and the anode of the reverse blocking triode thyristor Q1 is connected with rectification chip BR2 No. 1 pin, negative electrode and rectification core
Piece BR2 No. 3 pins connection.
A kind of 6. LED circuit with current-limiting protection as claimed in claim 1, it is characterised in that：The shunt circuit is electric capacity
C3。
A kind of 7. LED circuit with current-limiting protection as claimed in claim 3, it is characterised in that：Described filter capacitor C7 one end
It is connected respectively with rectification chip BR1 No. 1 pin and LED load positive pole, the other end is connected with LED load negative pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720799372.4U CN206879153U (en) | 2017-07-04 | 2017-07-04 | A kind of LED circuit with current-limiting protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720799372.4U CN206879153U (en) | 2017-07-04 | 2017-07-04 | A kind of LED circuit with current-limiting protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206879153U true CN206879153U (en) | 2018-01-12 |
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ID=61332583
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720799372.4U Active CN206879153U (en) | 2017-07-04 | 2017-07-04 | A kind of LED circuit with current-limiting protection |
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| Country | Link |
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| CN (1) | CN206879153U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI669024B (en) * | 2018-04-30 | 2019-08-11 | 曾偉菁 | Led tube adapted for use with electronic ballast or ac mains |
| CN110786079A (en) * | 2019-07-22 | 2020-02-11 | 深圳市豪恩智能物联股份有限公司 | Lamp tube, protection circuit and protection device applied to lamp tube |
-
2017
- 2017-07-04 CN CN201720799372.4U patent/CN206879153U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI669024B (en) * | 2018-04-30 | 2019-08-11 | 曾偉菁 | Led tube adapted for use with electronic ballast or ac mains |
| CN110786079A (en) * | 2019-07-22 | 2020-02-11 | 深圳市豪恩智能物联股份有限公司 | Lamp tube, protection circuit and protection device applied to lamp tube |
| CN110786079B (en) * | 2019-07-22 | 2021-09-21 | 深圳市豪恩智能物联股份有限公司 | Lamp tube, protection circuit and protection device applied to lamp tube |
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