CN107197565A - LED drive control circuits - Google Patents
LED drive control circuits Download PDFInfo
- Publication number
- CN107197565A CN107197565A CN201710539851.7A CN201710539851A CN107197565A CN 107197565 A CN107197565 A CN 107197565A CN 201710539851 A CN201710539851 A CN 201710539851A CN 107197565 A CN107197565 A CN 107197565A
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- resistance
- electric capacity
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- diode
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
-
- 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
The invention discloses a kind of LED drive controls circuit, first transformer, second transformer, switching power source chip, optocoupler, IGCT, first diode, 3rd diode, 4th diode, rectifier bridge, first inductance, first electric capacity, second electric capacity, 3rd electric capacity, 4th electric capacity, 5th electric capacity, 6th electric capacity, first resistor, second resistance, 3rd resistor, 4th resistance, 5th resistance and the 6th resistance, one end of the primary coil of first transformer connects zero line by the 6th resistance, the other end of the primary coil of first transformer and an input of rectifier bridge are connected, one end of the secondary coil of first transformer is connected with live wire, the other end of the secondary coil of first transformer and another input of rectifier bridge are connected, one output head grounding of rectifier bridge.Implement the LED drive control circuits of the present invention, have the advantages that：Circuit structure is relatively simple, can save hardware cost, the safety and reliability of circuit is higher.
Description
Technical field
The present invention relates to LED field, more particularly to a kind of LED drive controls circuit.
Background technology
Conventional constant-current drive circuit can be divided into linear constant current driver circuit for LED and switching mode constant current driver circuit for LED.
For linear constant current constant current driver circuit for LED, it possesses, and circuit is simple and lower-cost feature.Due to not needing inductance, height
The element such as frequency power transformer and electrochemical capacitor, greatly reduces circuit cost and improves EMI characteristics, extend LED driver
Service life.However, the component that traditional LED drive circuit is used is more, circuit structure is complex, and cost is higher.Separately
Outside, because traditional LED drive circuit lacks corresponding circuit protection function, cause the safety and reliability of circuit relatively low.
The content of the invention
The technical problem to be solved in the present invention is, for prior art drawbacks described above there is provided a kind of circuit structure compared with
For it is simple, the higher LED drive control circuits of safety and reliability of hardware cost, circuit can be saved.
The technical solution adopted for the present invention to solve the technical problems is：Construct a kind of LED drive controls circuit, including
One transformer, the second transformer, switching power source chip, optocoupler, IGCT, the first diode, the 3rd diode, the four or two pole
Pipe, rectifier bridge, the first inductance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, first
Resistance, second resistance, 3rd resistor, the 4th resistance, the 5th resistance and the 6th resistance, the primary coil of first transformer
One end connects zero line, the other end of the primary coil of first transformer and the one of the rectifier bridge by the 6th resistance
Input is connected, and one end of the secondary coil of first transformer is connected with live wire, the secondary coil of first transformer
The other end be connected with another input of the rectifier bridge, an output head grounding of the rectifier bridge, the rectifier bridge it is another
One end, the first pin of switching power source chip, the one end of first resistor and second of one output end respectively with first electric capacity
The negative pole connection of first primary coil of transformer, the negative electrode of the other end of the first resistor and first diode connects
Connect, the anode of first diode is connected with the positive pole of the first primary coil of second transformer；
The second pin of switching power source chip one end respectively with second electric capacity and the negative electrode of the 3rd diode
Connection, the other end ground connection of second electric capacity, the anode of the 3rd diode respectively with second transformer second
The positive pole of primary coil, the 7th pin of switching power source chip and the connection of the 8th pin, the second of second transformer are primary
The negative pole ground connection of coil, the 3rd pin ground connection of the switching power source chip, the 4th pin of the switching power source chip passes through
3rd capacity earth, the 6th pin of the switching power source chip is grounded by the second resistance, the Switching Power Supply
5th pin of chip is connected by the 6th electric capacity with the colelctor electrode of phototriode in the optocoupler, light in the optocoupler
The grounded emitter of quick triode, the anode of the positive pole of the secondary coil of second transformer and the 4th diode connects
Connect, the negative electrode of the four or two diode is connected with one end of the 4th electric capacity and one end of the first inductance respectively, described
The negative pole of the secondary coil of two transformers is connected with the other end of the 4th electric capacity, and the connection of the other end of first inductance+
12V power supplys, one end of the 3rd resistor is connected with one end of first inductance, the other end of the 3rd resistor with it is described
The anode connection of light emitting diode in optocoupler；
One end, one end of the 5th electric capacity and the crystalline substance of the negative electrode of light emitting diode respectively with the 3rd resistor in the optocoupler
The negative electrode connection of brake tube, the plus earth of the IGCT, the gate pole of the IGCT is another with the 5th electric capacity respectively
One end connection at end, one end of the 4th resistance and the 5th resistance, the other end of the 4th resistance is connected with+12 power supply,
The other end ground connection of 5th resistance, the capacitance of the 6th electric capacity is 150PF, and the resistance of the 6th resistance is 4.7K
Ω。
In LED drive controls circuit of the present invention, in addition to the 7th electric capacity and the 7th resistance, the 7th electric capacity
One end be connected with one end of the 3rd resistor, the other end of the 7th electric capacity is connected with one end of the 5th electric capacity,
One end of 7th resistance is connected with an output end of the rectifier bridge, the other end of the 7th resistance ground connection, and described the
The capacitance of seven electric capacity is 100PF, and the resistance of the 7th resistance is 33K Ω.
In LED drive controls circuit of the present invention, in addition to the 8th resistance, one end of the 8th resistance and institute
The negative electrode connection of the 3rd diode is stated, the other end of the 8th resistance is connected with the second pin of the switching power source chip,
The resistance of 8th resistance is 100 Ω.
In LED drive controls circuit of the present invention, in addition to the 9th resistance, one end of the 9th resistance and institute
State the anode connection of the 3rd diode, the other end of the 9th resistance respectively with the 7th pin of the switching power source chip and
8th pin is connected, and the resistance of the 9th resistance is 80 Ω.
In LED drive controls circuit of the present invention, in addition to the tenth resistance, one end of the tenth resistance and institute
The other end connection of the 4th electric capacity is stated, the other end of the tenth resistance is grounded, the resistance of the tenth resistance is 120 Ω.
Implement the LED drive control circuits of the present invention, have the advantages that：Due to provided with the first transformer, second
Transformer, switching power source chip, optocoupler, IGCT, the first diode, the 3rd diode, the 4th diode, rectifier bridge, first
Inductance, the first electric capacity, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, first resistor, second resistance,
3rd resistor, the 4th resistance, the 5th resistance and the 6th resistance, the LED drive controls circuit is relative to traditional LED drive controls
Circuit, the component that it is used is less, and the 6th electric capacity is used to prevent the interference between switching power source chip and optocoupler, the 6th resistance
Overcurrent protection is carried out for the branch road where the primary coil to the first transformer, therefore circuit structure is relatively simple, can save
Hardware cost, circuit safety and reliability it is higher.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the circuit theory diagrams in LED drive controls circuit one embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
In LED drive controls circuit embodiments of the present invention, the LED drive control circuit theory diagrams are as shown in Figure 1.Fig. 1
In, the LED drive controls circuit includes the first transformer T1, the second transformer T2, switching power source chip U1, optocoupler U2, brilliant lock
Pipe Q1, the first diode D1, the 3rd diode D3, rectifier bridge D2, the 4th diode D4, the first inductance L1, the first electric capacity C1,
Two electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4, the 5th electric capacity C5, the 6th electric capacity C6, first resistor R1, second resistance R2,
Three resistance R3, the 4th resistance R4, the 5th resistance R5 and the 6th resistance R6, wherein, one end of the first transformer T1 primary coil
By the 6th resistance R6 connections zero line N, the other end of the first transformer T1 primary coil connects with a rectifier bridge D2 input
Connect, one end of the first transformer T1 secondary coil is connected with live wire L, the other end of the first transformer T secondary coil with it is whole
Flow bridge D2 another input connection, a rectifier bridge D2 output head grounding, rectifier bridge D2 another output end is respectively with first
Electric capacity C1 one end, switching power source chip U1 the first pin, first resistor R1 one end and the second transformer T2 first at the beginning of
The negative pole connection of level coil, the first resistor R1 other end is connected with the first diode D1 negative electrode, the first diode D1 sun
Pole is connected with the positive pole of the second transformer T2 the first primary coil.
In the present embodiment, the one end and the three or two pole of switching power source chip U1 second pin respectively with the second electric capacity C2
Pipe D3 negative electrode connection, the second electric capacity C2 other end ground connection, the 3rd diode D3 anode is respectively with the second transformer T2's
The positive pole of second primary coil, switching power source chip U1 the 7th pin and the connection of the 8th pin, the second of the second transformer T2
The negative pole ground connection of primary coil, switching power source chip U1 the 3rd pin ground connection, switching power source chip U1 the 4th pin passes through
3rd electric capacity C3 is grounded, and switching power source chip U1 the 6th pin is grounded by second resistance R2, and the of switching power source chip U1
Five pins are connected by the 6th electric capacity C6 with the colelctor electrode of phototriode in optocoupler U2, the transmitting of phototriode in optocoupler U2
Pole is grounded, and the positive pole of the second transformer T2 secondary coil is connected with the 4th diode D4 anode, the four or two diode D4's
Negative electrode is connected with the 4th electric capacity C4 one end and the first inductance L1 one end respectively, the negative pole of the second transformer T2 secondary coil
It is connected with the 4th electric capacity C4 other end, the first inductance L1 other end connection+12V power supplys, 3rd resistor R3 one end and the
One inductance L1 one end connection, the 3rd resistor R3 other end is connected with the anode of light emitting diode in optocoupler U2.
One end, the 5th electric capacity C5 one end and the brilliant lock of the negative electrode of light emitting diode respectively with 3rd resistor R3 in optocoupler U2
Pipe Q1 negative electrode connection, IGCT Q1 plus earth, the IGCT Q1 gate pole other end respectively with the 5th electric capacity C5, the 4th
Resistance R4 one end and the connection of the 5th resistance R5 one end, the 4th resistance R4 other end are connected with+12 power supplys, the 5th resistance R5
Other end ground connection, the 6th electric capacity C6 capacitance is 150PF, and the 6th resistance R6 resistance is 4.7K Ω.
The LED drive controls circuit is compared with traditional LED drive control circuits, and the component that it is used is less, circuit
Structure is relatively simple, can so save hardware cost.In addition, the 6th electric capacity C6 is coupled capacitor, for preventing Switching Power Supply
Interference between chip U1 and optocoupler U2.6th resistance R6 is current-limiting resistance, for the primary coil institute to the first transformer T1
Branch road carry out overcurrent protection, therefore the safety and reliability of circuit is higher.
In the present embodiment, switching power source chip U1 the first pin is starts resistance connection end, and second pin is drawn for power supply
Pin, the 3rd pin is grounding pin, and the 4th pin is timing capacitor connection end, and the 5th pin is feedback input end, the 6th pin
For current detecting end, the 7th pin and the 8th pin are output end.
When input voltage reaches switching power source chip U1 startup voltage, switching power source chip U1 one constant current of output
Voltage, and voltage is stablized by connected peripheral components, control IGCT Q1 conducting makes the second transformer T2
The first primary coil and the control source stablized of the second primary coil so that the second transformer T2 secondary coil sense
Stable voltage should be arrived, then the stable electric current of power output end (i.e.+12V power supplys) output of the LED drive control circuits, is used
In driving low-power LED.
In the present embodiment, the LED drive controls circuit also includes the 7th electric capacity C7 and the 7th resistance R7, wherein, the 7th electricity
The one end for holding C7 is connected with 3rd resistor R3 one end, and the 7th electric capacity C7 other end is connected with the 5th electric capacity C5 one end, the
Seven electric capacity C7 capacitance is 100PF, and the 7th resistance R7 resistance is 33K Ω.7th electric capacity C7 is coupled capacitor, for preventing
Interference between first inductance L1 and optocoupler U2.7th resistance R7 is current-limiting resistance, for the output end institute to rectifier bridge D2
Branch road carry out overcurrent protection, so can further improve the safety and reliability of circuit.
In the present embodiment, the LED drive controls circuit also include the 8th resistance R8, wherein, the 8th resistance R8 one end with
3rd diode D3 negative electrode connection, the 8th resistance R8 other end is connected with switching power source chip U1 second pin, and the 8th
Resistance R8 resistance is 100 Ω.8th resistance R8 is current-limiting resistance, for where the second pin to switching power source chip U1
Branch road carries out overcurrent protection, further to improve the safety and reliability of circuit.
In the present embodiment, the LED drive controls circuit also includes the 9th resistance R9, the 9th resistance R9 one end and the three or two
Pole pipe D3 anode connection, the 9th resistance R9 other end connects with switching power source chip U1 the 7th pin and the 8th pin respectively
Connect, the 9th resistance R9 resistance is 80 Ω.9th resistance R9 is current-limiting resistance, for switching power source chip U1 and the second transformation
Branch road between device T2 carries out overcurrent protection, to further enhance the effect of current limliting.
In the present embodiment, the LED drive controls circuit also includes the tenth resistance R10, the tenth resistance R10 one end and the 4th
Electric capacity C4 other end connection, the tenth resistance R10 other end ground connection, the tenth resistance R10 resistance is 120 Ω.Tenth resistance
R10 is current-limiting resistance, overcurrent protection is carried out for the branch road where the other end of the secondary coil to the second transformer T2, with more
Further enhance the effect of current limliting.
In a word, in the present embodiment, the component that the LED drive control circuits are used is less, and circuit structure is relatively simple, energy
Save hardware cost.In addition, current-limiting resistance and coupled capacitor are provided with the LED drive control circuits, therefore the security of circuit
It is higher with reliability.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God is with principle, and any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (5)
1. a kind of LED drive controls circuit, it is characterised in that including the first transformer, the second transformer, switching power source chip,
Optocoupler, IGCT, the first diode, the 3rd diode, the 4th diode, rectifier bridge, the first inductance, the first electric capacity, the second electricity
Appearance, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the 6th electric capacity, first resistor, second resistance, 3rd resistor, the 4th resistance,
Five resistance and the 6th resistance, one end of the primary coil of first transformer connect zero line by the 6th resistance, described
The other end of the primary coil of first transformer is connected with an input of the rectifier bridge, the secondary wire of first transformer
One end of circle is connected with live wire, and the other end of the secondary coil of first transformer connects with another input of the rectifier bridge
Connect, an output head grounding of the rectifier bridge, another output end of rectifier bridge one end respectively with first electric capacity, open
The negative pole connection of first primary coil of the first pin of powered-down source chip, one end of first resistor and the second transformer, it is described
The other end of first resistor is connected with the negative electrode of first diode, the anode of first diode and second transformation
The positive pole connection of first primary coil of device；
The second pin of the switching power source chip is connected with one end of second electric capacity and the negative electrode of the 3rd diode respectively,
The other end ground connection of second electric capacity, the second primary line of the anode of the 3rd diode respectively with second transformer
The positive pole of circle, the 7th pin of switching power source chip and the connection of the 8th pin, the second primary coil of second transformer
Negative pole is grounded, the 3rd pin of switching power source chip ground connection, and the 4th pin of the switching power source chip passes through described the
Three capacity earths, the 6th pin of the switching power source chip is grounded by the second resistance, the switching power source chip
5th pin is connected by the 6th electric capacity with the colelctor electrode of phototriode in the optocoupler, photosensitive three pole in the optocoupler
The grounded emitter of pipe, the positive pole of the secondary coil of second transformer is connected with the anode of the 4th diode, described
The negative electrode of four or two diode is connected with one end of the 4th electric capacity and one end of the first inductance respectively, second transformer
The negative pole of secondary coil be connected with the other end of the 4th electric capacity, the other end connection+12V power supplys of first inductance,
One end of the 3rd resistor is connected with one end of first inductance, and the other end of the 3rd resistor in the optocoupler with sending out
The anode connection of optical diode；
One end, one end of the 5th electric capacity and the IGCT of the negative electrode of light emitting diode respectively with the 3rd resistor in the optocoupler
Negative electrode connection, the plus earth of the IGCT, the gate pole of the IGCT other end respectively with the 5th electric capacity, the
One end of four resistance and the connection of one end of the 5th resistance, the other end of the 4th resistance is connected with+12 power supply, and described the
The other end ground connection of five resistance, the capacitance of the 6th electric capacity is 150PF, and the resistance of the 6th resistance is 4.7K Ω.
2. LED drive controls circuit according to claim 1, it is characterised in that also including the 7th electric capacity and the 7th resistance,
One end of 7th electric capacity is connected with one end of the 3rd resistor, the other end and the 5th electric capacity of the 7th electric capacity
One end connection, one end of the 7th resistance is connected with an output end of the rectifier bridge, the other end of the 7th resistance
Ground connection, the capacitance of the 7th electric capacity is 100PF, and the resistance of the 7th resistance is 33K Ω.
3. LED drive controls circuit according to claim 2, it is characterised in that also including the 8th resistance, the 8th electricity
One end of resistance is connected with the negative electrode of the 3rd diode, and the of the other end of the 8th resistance and the switching power source chip
Two pins are connected, and the resistance of the 8th resistance is 100 Ω.
4. the LED drive control circuits according to claims 1 to 3 any one, it is characterised in that also including the 9th electricity
Resistance, one end of the 9th resistance is connected with the anode of the 3rd diode, the other end of the 9th resistance respectively with institute
The 7th pin and the connection of the 8th pin of switching power source chip are stated, the resistance of the 9th resistance is 80 Ω.
5. the LED drive control circuits according to claims 1 to 3 any one, it is characterised in that also including the tenth electricity
Resistance, one end of the tenth resistance is connected with the other end of the 4th electric capacity, the other end ground connection of the tenth resistance, described
The resistance of tenth resistance is 120 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710539851.7A CN107197565A (en) | 2017-07-05 | 2017-07-05 | LED drive control circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710539851.7A CN107197565A (en) | 2017-07-05 | 2017-07-05 | LED drive control circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107197565A true CN107197565A (en) | 2017-09-22 |
Family
ID=59880769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710539851.7A Pending CN107197565A (en) | 2017-07-05 | 2017-07-05 | LED drive control circuits |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107197565A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108521694A (en) * | 2018-03-29 | 2018-09-11 | 电子科技大学 | A kind of LED half-bridge circuits of band feedback frequency-conversion constant-current driving |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204119612U (en) * | 2014-09-29 | 2015-01-21 | 东莞理工学院 | 10w led drive circuit |
-
2017
- 2017-07-05 CN CN201710539851.7A patent/CN107197565A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204119612U (en) * | 2014-09-29 | 2015-01-21 | 东莞理工学院 | 10w led drive circuit |
Non-Patent Citations (2)
| Title |
|---|
| 赵慧荣: "LED驱动电路的电磁噪声研究及其改进", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑 2012年第10期》 * |
| 邢德松: "矿用隔爆型巷道照明灯驱动电路设计", 《煤矿机械》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108521694A (en) * | 2018-03-29 | 2018-09-11 | 电子科技大学 | A kind of LED half-bridge circuits of band feedback frequency-conversion constant-current driving |
| CN108521694B (en) * | 2018-03-29 | 2023-09-22 | 电子科技大学 | LED half-bridge circuit with feedback variable-frequency constant-current drive |
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Application publication date: 20170922 |