CN105120580B - The LED tube protective circuit of ballast driven - Google Patents
The LED tube protective circuit of ballast driven Download PDFInfo
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- CN105120580B CN105120580B CN201510634900.6A CN201510634900A CN105120580B CN 105120580 B CN105120580 B CN 105120580B CN 201510634900 A CN201510634900 A CN 201510634900A CN 105120580 B CN105120580 B CN 105120580B
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Abstract
The present invention provides a kind of LED tube protective circuit of ballast driven, including high-frequency rectification circuit, arc signal samples and formed circuit, controlling switch circuit, LED luminescence components circuit and voltage absorpting circuit, the arc signal sample circuit that arc signal is sampled and formed in circuit, it is serially connected with the two ends input lamp base A of high-frequency rectification circuit and electric ballast drive signal, between B, arc signal samples and formed circuit and is also connected with controlling switch circuit, after master switch pipe in controlling switch circuit is in parallel with voltage absorpting circuit, it is connected with LED luminescence component circuit connected in series, when arc signal samples and formed the output arc sampling voltage of circuit, sample and formed after the voltage limit circuit threshold threshold voltage of circuit more than arc signal, controlling switch circuit controls its master switch pipe to disconnect, the voltage at voltage absorpting circuit reduction LED luminescence component circuits two ends, extinguish the two ends input lamp base A of electric ballast drive signal, electric arc between B.
Description
Technical field
The present invention relates to field of LED illumination, the LED tube protective circuit of more particularly to a kind of ballast driven.
Background technology
In recent years, LED illumination shows many advantages, such as with efficiency height, long lifespan, compact and environmental protection
Developing state with rapid changepl. never-ending changes and improvements.One epoch for substituting fluorescent lighting with LED illumination has arrived.
LED driving, there is two kinds of basic modes, the LED driver of customization and utilization electronic ballast for fluoresent lamp driving.
In the illuminator with tubular fluorescent lamp, by the use of original electric ballast as the driver of LED lamp tube, in light fixture transformation
During, it can not only save and separately configure special LED driver, can more save substantial amounts of manpower, this is to labour cost
Expensive country is particularly evident.
Protection for LED lamp bead has more and more been taken seriously.Except overtemperature protection, overcurrent protection, lamp base or inside connect
The loose contact of fitting, because the event for burning LED lamp bead that electric arc triggers happens occasionally.Contact between fluorescent tube lamp base and lamp socket
It is bad when be also easy to appear in hot plugging fluorescent tube.And it is when carrying out transforming or repairing in flakes to light fixture to plug fluorescent tube
Most frequently adopted method.Do not possess the LED lamp tube of arc protection function, it is often just before normal use, powered inserting
Lamp socket just suffer from a flash burn.
Known arc protection guard method is using the resettable fuse for being mainly used as overheat protector, when the serious electricity of appearance
Arc, when the temperature of lamp holder is uprised, resettable fuse disconnects, and stops electric arc, this is a kind of scheme of passive type arc protection, only
It is to be worked when electric arc is serious.
The content of the invention
The present invention provides a kind of LED tube protective circuit of ballast driven, including high-frequency rectification circuit, and arc signal takes
Sample and formation circuit, controlling switch circuit, LED luminescence components circuit and voltage absorpting circuit, it is characterised in that arc signal
Sampling and the armature winding of the arc signal sampling transformer formed in circuit, are serially connected with high-frequency rectification circuit and electronic ballast
Between two ends input lamp base A, B of device drive signal, arc signal sampling and formation circuit are also connected with controlling switch circuit, are controlled
After master switch pipe in on-off circuit processed is in parallel with voltage absorpting circuit, it is connected with LED luminescence component circuit connected in series, works as electric arc
Sample of signal and the output arc sampling voltage for forming circuit, sample and are formed the voltage limit circuit of circuit more than arc signal
After threshold threshold voltage, controlling switch circuit controls its master switch pipe to disconnect, voltage absorpting circuit reduction LED luminescence component electricity
The voltage at road two ends, extinguishes electric arc between two ends input lamp base A, B of electric ballast drive signal.
The bridge rectifier that the high-frequency rectification circuit is made up of commutation diode.
The arc signal sampling and formation circuit are provided with arc sampling transformer T1, detecting circuit, filter circuit and electricity
Limit circuit is pressed, voltage limit circuit is preset with threshold threshold voltage, and is connected with the controlling switch circuit.
The controlling switch circuit is sampled and shape provided with on-off circuit and control circuit, on-off circuit by the arc signal
Voltage limit circuit is controlled into circuit, when the commutating voltage that detecting circuit is exported is more than the threshold voltage of voltage limit circuit
When, the switching tube conducting of on-off circuit disconnects the master switch pipe of control circuit.
The LED luminescence components circuit is by LED bead string LEDs and the assistant starting electric capacity and discharge resistance that are connected in parallel
Composition.
The voltage absorpting circuit is the negative pole end in LED bead string LEDs, is connected in series after resistance and high-frequency rectification electricity
The VD V on road- End connection.
Switching tube in the controlling switch circuit is the switching tube of bipolar transistor, or field-effect transistor is opened
Guan Guan；Master switch pipe is the switching tube of field-effect transistor, or bipolar transistor switching tube.
It is an advantage of the current invention that be soon detected on the first appearance in electric arc, and by arc voltage set in advance
Value, the root occurred in good time using the arc extinguishing measure of active, breaking arc, is a kind of more efficiently arc protection method.
Brief description of the drawings
Fig. 1 is basic circuit diagram of the embodiment of the present invention.
Label declaration in figure
1-high-frequency rectification circuit
2-arc signal samples and formed circuit
3-controlling switch circuit
4-LED luminescence component circuits
5-voltage absorpting circuit
A, B-fluorescent tube input lamp base
V+- high-frequency rectification circuit output plus terminals
V-- high-frequency rectification circuits export negative terminal
R1-resistance
R2-filter resistance
R3-resistance
R4, R5-divider resistance
R6-discharge resistance
R7-voltage absorption resistance
C1, C2-filter resistance
C3-assistant starting electric capacity
D1, D2, D3, D4-commutation diode
D5-detector diode
ZD1, ZD2-voltage-regulator diode
Q1-switching tube
Q2-master switch pipe
LEDs-LED bead string
T1-arc sampling transformer.
Embodiment
Accompanying drawing is referred to, the invention will be further described.
A kind of LED tube protective circuit of ballast driven, including high-frequency rectification circuit（1）, arc signal sampling and shape
Into circuit（2）, controlling switch circuit（3）, LED luminescence component circuits（4）And voltage absorpting circuit（5）, arc signal sampling
And form circuit（2）In arc signal sampling transformer transformer T1 armature winding, be serially connected with high-frequency rectification circuit（1）With
And between two ends input lamp base A, B of electric ballast drive signal, arc signal sampling and formation circuit（2）Also opened with control
Powered-down road（3）Connection, controlling switch circuit（3）In master switch pipe Q2 and voltage absorpting circuit（5）After parallel connection, sent out with LED
Optical assembly circuit（4）It is connected in series, when arc signal samples and formed circuit（2）Output arc sampling voltage, more than electric arc
Sample of signal and formation circuit（2）Voltage limit circuit threshold threshold voltage after, controlling switch circuit controls its master switch
Pipe Q2 disconnects, voltage absorpting circuit（5）Reduce LED luminescence component circuits（4）The voltage at two ends, extinguishes electric ballast driving letter
Number two ends input lamp base A, B between electric arc.
The high-frequency rectification circuit（1）It is the bridge rectifier being made up of commutation diode D1, D2, D3 and D4.
The arc signal sampling and formation circuit（2）Provided with arc sampling transformer T1, detecting circuit, filter circuit and
Voltage limit circuit, voltage limit circuit is preset with threshold threshold voltage, and is connected with the controlling switch circuit.Go out in lamp base
During existing electric arc, arc sampling transformer T1 secondary windings inductive output arc signals, through resistance R1 and diode D5 detections, filtering
Resistance R2 and filter condenser C1 filtering, after arc signal intensity reaches the threshold threshold set by voltage-regulator diode ZD1, to
The controlling switch circuit（3）Controlling switch pipe Q1 control pole output high level continuity signal.
The controlling switch circuit（3）Including switching tube Q1, by divider resistance R4, R5, voltage-regulator diode ZD2, filtered electrical
Hold the master switch pipe Q2 control electrode potential biasing circuits of C2 compositions, in the LED luminescence components circuit（4）The normal work phase
Between, switching tube Q1 cut-offs, master switch pipe Q2 conductings, the drive signal from electric ballast is through the high-frequency rectification circuit
（1）Output voltage afterwards is applied to the LED luminescence components circuit（4）Two ends, LED bead string LEDs is normally lighted；In lamp base
There is electric arc and reach after some strength, the arc signal sampling and formation circuit（2）The arc sampling signal of output makes out
Pipe Q1 conductings are closed, so that master switch pipe Q2 ends, high-frequency rectification circuit（1）Output voltage be applied to the LED light
Assembly circuit（4）With the voltage absorpting circuit（5）Series circuit on, LED bead string LEDs electric current, which is reduced to, to be not enough to
Cause the glimmer state of lamp base electric arc.
The LED luminescence components circuit（4）By LED bead string LEDs and the assistant starting electric capacity C1 being connected in parallel and electric discharge
Resistance R3 is constituted.
The voltage absorpting circuit is the negative pole end in LED bead string LEDs, is connected in series after resistance R7 and high-frequency rectification
Circuit（1）VD V- End connection.
The controlling switch circuit（3）In master switch pipe Q2 be field-effect transistor, or bipolar transistor；Open
It is bipolar transistor to close pipe Q1, or field-effect transistor.
Lamp base A connection commutation diodes D1 positive pole and commutation diode D2 negative pole.Lamp base B connection arc sampling transformations
2 pin of device T1 armature windings, the 1 pin connection commutation diode D3 of arc sampling transformer T1 armature windings positive pole and rectification two
Pole pipe D4 negative pole.Commutation diode D1 negative pole and commutation diode D3 negative pole link together, and constitute the high frequency whole
Current circuit（1）Output plus terminal V+；Commutation diode D2 positive pole and commutation diode D4 positive pole link together, and constitute institute
State high-frequency rectification circuit（1）Output negative terminal V-, i.e. common ground potential.
The 3 pin ground connection of arc sampling transformer T1 secondary windings, 4 pin connection resistance R1 one end.The resistance R1 other end
Connect commutation diode D5 positive pole.Commutation diode D5 negative pole and filter resistance R2 one end, filter capacitor C1 one end
And resistance R3 one end links together.The filter resistance R2 other end and filter capacitor C1 other end ground connection.Resistance R3
Other end connection voltage-regulator diode ZD1 negative pole.Voltage-regulator diode ZD1 positive pole connection controlling switch pipe Q1 base stage.With
What controlling switch pipe Q1 colelctor electrode linked together have divider resistance R4, R5 each one end, voltage-regulator diode ZD2 negative pole,
Filter capacitor C2 one end, and master switch pipe Q2 control pole G.Controlling switch pipe Q1 emitter stage, divider resistance R4's
The other end, voltage-regulator diode ZD2 positive pole, the filter capacitor C2 other end, and master switch pipe Q2 source S ground connection.Point
Piezoresistance R5 another termination high-frequency rectification circuit（1）Output plus terminal V+.
The LED luminescence components circuit（4）In, LED bead string LEDs positive pole, assistant starting electric capacity C1 one end, with
And discharge resistance R3 one end links together, and and high-frequency rectification circuit（1）Output plus terminal V+ be connected.LED bead string
LEDs negative pole, the assistant starting electric capacity C1 other end, and the discharge resistance R3 other end link together, and are opened with master control
Close pipe Q2 drain D and voltage absorption resistance R7 one end is connected.
When controlling switch pipe Q1 uses field-effect transistor instead, and master switch pipe Q2 uses bipolar transistor instead, field-effect
The control pole G of transistor, source S, the base stage of drain D successively with bipolar transistor, emitter stage, colelctor electrode is corresponding.
During normal operation, LED luminescence components circuit（4）Upper application is high-frequency rectification circuit（1）Output to glimmering
The commutating voltage of light lamp electronic ballast drive signal, when occurring because of lamp base or internal connection loose contact, arc signal takes
Sample and formation circuit（2）The arc signal of middle formation passes through controlling switch circuit（3）Make voltage absorpting circuit（5）It is luminous with LED
Assembly circuit（4）Series connection, so that the electric current of LED bead string, which is reduced to, is not enough to the generation for causing electric arc, and with faint bright
There is failure in degree expression.
Claims (7)
1. a kind of LED tube protective circuit of ballast driven, including high-frequency rectification circuit, arc signal sampling and formation electricity
Road, controlling switch circuit, LED luminescence components circuit and voltage absorpting circuit, it is characterised in that arc signal is sampled and formed
The armature winding of arc signal sampling transformer in circuit, is serially connected with high-frequency rectification circuit and electric ballast drive signal
Two ends input lamp base A, B between, arc signal sampling and form circuit and be also connected with controlling switch circuit, controlling switch circuit
In master switch pipe it is in parallel with voltage absorpting circuit after, be connected with LED luminescence component circuit connected in series, when arc signal sampling and
The output arc sampling voltage of circuit is formed, the voltage limit circuit threshold threshold electricity of circuit is sampled and formed more than arc signal
After pressure, controlling switch circuit controls its master switch pipe to disconnect, the electricity at voltage absorpting circuit reduction LED luminescence component circuits two ends
Pressure, extinguishes electric arc between two ends input lamp base A, B of electric ballast drive signal.
2. the LED tube protective circuit of ballast driven according to claim 1, it is characterised in that：The high-frequency rectification
The bridge rectifier that circuit is made up of commutation diode.
3. the LED tube protective circuit of ballast driven according to claim 1, it is characterised in that：The arc signal
Sampling and formation circuit are provided with arc sampling transformer T1, detecting circuit, filter circuit and voltage limit circuit, the spacing electricity of voltage
Road is preset with threshold threshold voltage, and is connected with the controlling switch circuit.
4. the LED tube protective circuit of ballast driven according to claim 1, it is characterised in that：The controlling switch
Circuit is sampled and formed voltage limit circuit in circuit provided with on-off circuit and control circuit, on-off circuit by the arc signal
Control, when the commutating voltage that detecting circuit is exported is more than the threshold voltage of voltage limit circuit, the switching tube of on-off circuit is led
It is logical, disconnect the master switch pipe of control circuit.
5. the LED tube protective circuit of ballast driven according to claim 1, it is characterised in that：The LED lights group
Part circuit is made up of LED bead string LEDs and the assistant starting electric capacity and discharge resistance that are connected in parallel.
6. the LED tube protective circuit of ballast driven according to claim 1, it is characterised in that：The voltage absorbs
Circuit is the negative pole end in LED bead string LEDs, is connected in series the VD V with high-frequency rectification circuit after resistance- End
Connection.
7. the LED tube protective circuit of ballast driven according to claim 3, it is characterised in that：The controlling switch
Switching tube in circuit is the switching tube of bipolar transistor, or field-effect transistor switching tube；Master switch pipe is field
The switching tube of effect transistor, or bipolar transistor switching tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510634900.6A CN105120580B (en) | 2015-09-30 | 2015-09-30 | The LED tube protective circuit of ballast driven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510634900.6A CN105120580B (en) | 2015-09-30 | 2015-09-30 | The LED tube protective circuit of ballast driven |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105120580A CN105120580A (en) | 2015-12-02 |
| CN105120580B true CN105120580B (en) | 2017-08-08 |
Family
ID=54668399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510634900.6A Active CN105120580B (en) | 2015-09-30 | 2015-09-30 | The LED tube protective circuit of ballast driven |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105120580B (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8760065B2 (en) * | 2010-12-22 | 2014-06-24 | Century Concept Limited | Passive anti-arcing protection device for fluorescent lamp ballast |
| US20150195880A1 (en) * | 2014-01-06 | 2015-07-09 | Lunera Lighting, Inc. | Lighting system with built-in intelligence |
| CN104918394A (en) * | 2014-03-11 | 2015-09-16 | 通用电气公司 | Ballast, and arc protection apparatus and method |
| CN204046904U (en) * | 2014-08-19 | 2014-12-24 | 上海阿卡得电子有限公司 | A kind of electronic ballast for fluoresent lamp arc suppressing circuit |
| CN104144548B (en) * | 2014-08-19 | 2016-09-07 | 上海阿卡得电子有限公司 | A kind of electronic ballast for fluoresent lamp arc suppressing circuit |
| CN204168570U (en) * | 2014-11-13 | 2015-02-18 | 广东雪莱特光电科技股份有限公司 | Negative pressure rectification circuit and high-intensity gas discharge lamp |
| CN205005317U (en) * | 2015-09-30 | 2016-01-27 | 谷原光电科技（上海）有限公司 | Ballast driven LED fluorescent tube protection circuit |
-
2015
- 2015-09-30 CN CN201510634900.6A patent/CN105120580B/en active Active
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| CN105120580A (en) | 2015-12-02 |
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