CN105848363A - Linear dimming LED constant-current output driving system - Google Patents
Linear dimming LED constant-current output driving system Download PDFInfo
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- CN105848363A CN105848363A CN201610370318.8A CN201610370318A CN105848363A CN 105848363 A CN105848363 A CN 105848363A CN 201610370318 A CN201610370318 A CN 201610370318A CN 105848363 A CN105848363 A CN 105848363A
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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]
- H05B45/30—Driver circuits
- H05B45/395—Linear regulators
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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]
- H05B45/10—Controlling the intensity of the light
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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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Abstract
The invention discloses a linear dimming LED constant-current output driving system. The linear dimming LED constant-current output driving system is characterized by manly comprising a processing chip U, a triode VT2, a protecting circuit, a low-pass filter circuit, a linear dimming circuit, a resistor R1, a capacitor C4, a gate driving circuit and the like, wherein the low-pass filter circuit is connected between the protecting circuit and the processing chip U in series; the linear dimming circuit is connected between a base of the triode VT2 and the protecting circuit in series; the resistor R1 is connected between a collector of the VT2 and an LD pin of the processing chip U; a positive electrode of the capacitor C4 is connected with an emitter of the triode VT2 and a negative electrode is connected with an RI pin of the processing chip U; and the gate driving circuit is connected with a GATE pin of the processing chip U and the low-pass filter circuit. Adjustment can be carried out on the brightness of an LED according to the requirements. Compared with a traditional LED driving system, the linear dimming LED constant-current output driving system has better linearity during adjustment of the brightness of the LED; the LED more stably works; and the flicker phenomenon is avoided.
Description
Technical field
The present invention relates to electronic applications, specifically refer to a kind of can the LED constant current output driving system of linearity light adjusting.
Background technology
At present, due to LED have that energy consumption is low, the feature such as length in service life and safety and environmental protection, it is
Become one of main product of people's life lighting.Along with the universal of LED and people are to illuminating effect requirement
Improve constantly, bring new challenge to LED drive system.But, traditional LED drive system is held
Being vulnerable to the impact of interference factor, cause it cannot export stabling current, this affects LED to a large extent
Normal work, serious also can damage LED.
Summary of the invention
It is an object of the invention to the impact overcoming traditional LED drive system to be easily subject to extraneous factor, lead
Cause its defect that cannot export stabling current, it is provided that a kind of can the LED constant current output driving system of linearity light adjusting.
The purpose of the present invention is achieved through the following technical solutions: a kind of can linearity light adjusting LED constant current output drive
Dynamic system, mainly by processing chip U, audion VT2, protection circuit, is serially connected in protection circuit and process
Low-pass filter circuit between chip U, be serially connected between base stage and the protection circuit of audion VT2 is linear
Light adjusting circuit, is serially connected in the resistance R1 between the colelctor electrode of VT2 and the LD pin processing chip U, positive pole
Be connected with the emitter stage of audion VT2, negative pole then with the electric capacity that is connected of RI pin processing chip U
C4, the gate driver circuit being connected with the GATE pin processing chip U and low-pass filter circuit respectively,
And the current feedback circuit composition being serially connected between gate driver circuit and the CS pin processing chip U.
Further, described linearity light adjusting circuit is by bidirectional thyristor D8, and audion VT5, N pole is with two-way
The diode that the first anode of IGCT D8 is connected, P pole then colelctor electrode with audion VT5 is connected
D10, one end is connected with the N pole of diode D10, the other end then after potentiometer R10 with two-way brilliant lock
The resistance R9 that the second plate of pipe D8 is connected, is serially connected in N pole and the audion VT5 of diode D10
Base stage between resistance R11, positive pole is connected with the base stage of audion VT5, negative pole then with two-way brilliant lock
The electric capacity C6 that the second plate of pipe D8 is connected, is serially connected in the emitter stage of audion VT5 and electric capacity C6
Resistance R12 between negative pole, positive pole is connected with the colelctor electrode of audion VT5, negative pole then with electric capacity C6
Negative pole the electric capacity C7, the resistance R13 being in parallel with electric capacity C7 that are connected, and P pole and two-way brilliant lock
Pipe D8 controls the diode D9 composition that end is connected, N pole then base stage with audion VT5 is connected；
The first anode of described bidirectional thyristor D8 as this linearity light adjusting circuit input and with protection circuit phase
Connection, its second plate ground connection；The positive pole of described electric capacity C7 as this linearity light adjusting circuit outfan and with
The base stage of audion VT2 is connected.
Described protection circuit by electric capacity C1, one end is connected with the positive pole of electric capacity C1, the other end then with electric capacity
The negative pole of C1 is collectively forming the fuse FU of the input of this protection circuit, and P pole and electric capacity C1's is negative
The diode D1 composition that pole is connected, N pole then input with linearity light adjusting circuit is connected；Described electric capacity
The positive pole of C1 is also connected with low-pass filter circuit.
Described low-pass filter circuit is by audion VT1, and positive pole is connected with the positive pole of electric capacity C1, minus earth
Electric capacity C2, be serially connected in electric capacity C2 negative pole and process chip U GND pin between resistance R3,
The diode that N pole is connected with the emitter stage of audion VT1, P pole then negative pole with electric capacity C2 is connected
D2, the electricity that negative pole is connected with the colelctor electrode of audion VT1, positive pole then positive pole with electric capacity C1 is connected
Appearance C3, N pole is connected with the positive pole of electric capacity C1, diode D4, P pole and the audion VT1 of P pole ground connection
The diode D3 that base stage is connected, N pole is connected with the P pole of diode D4 after resistance R4, and
P pole is connected with the VIN pin processing chip U, N pole after resistance R5 with the N pole phase of diode D4
The diode D5 composition connected；The N pole of described diode D4 is also connected with gate driver circuit.
Described gate driver circuit is sent out with audion VT3's by audion VT3, field effect transistor MOS, one end
Emitter-base bandgap grading is connected, the resistance R6 of other end ground connection, and negative pole is connected with the colelctor electrode of audion VT3, positive pole
Electric capacity C5, the P pole being then connected with the N pole of diode D4 is connected with the drain electrode of field effect transistor MOS,
The diode D7 that N pole positive pole with electric capacity C5 after resistance R7 is connected, and one end and diode D7
P pole be connected, the other end then positive pole with electric capacity C5 is collectively forming the outfan of this gate driver circuit
Inductance L2 forms；The base stage of described audion VT3 is connected with the GATE pin processing chip U, it
Colelctor electrode is then connected with the grid of field effect transistor MOS；The source electrode of described field effect transistor MOS then with electric current
Feedback circuit is connected.
Described current feedback circuit is connected with the colelctor electrode of audion VT4, separately by audion VT4, one end
The resistance R8 of one end ground connection, and N pole is connected with the CS pin processing chip U after resistance R2, P
The pole diode D6 composition that then emitter stage with audion VT4 is connected after inductance L1；Described audion
The base stage of VT4 is connected with the source electrode of field effect transistor MOS.
Described process chip U is the integrated chip of PT4107.
The present invention compared with the prior art, has the following advantages and beneficial effect:
(1) interference signal can be filtered by the present invention, so that its output electric current is more stable；Simultaneously
Output electric current can also be detected by the present invention, thus real-time output electric current is adjusted, further
Improve its output electric current stability.
(2) present invention can be adjusted, with traditional LED drivetrain according to demand in brightness to LED
System is compared, and linearity when LED luminance is adjusted by it is more preferable, makes LED operation more stable, it is to avoid occur
The phenomenon of flicker.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present invention.
Fig. 2 is the structure chart of the linearity light adjusting circuit of the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not
It is limited to this.
Embodiment
As it is shown in figure 1, the present invention can the LED constant current output driving system of linearity light adjusting, mainly by processing
Chip U, audion VT2, resistance R1, electric capacity C4, protection circuit, linearity light adjusting circuit, low-pass filtering
Circuit, gate driver circuit and current feedback circuit composition.
Wherein, low-pass filter circuit is serially connected in protection circuit and processes between chip U.Linearity light adjusting circuit is then
It is serially connected between the base stage of protection circuit and audion VT2.Resistance R1 is serially connected in colelctor electrode and the place of VT2
Between the LD pin of reason chip U.The positive pole of electric capacity C4 is connected with the emitter stage of audion VT2, it
Negative pole is then connected with the RI pin processing chip U.Gate driver circuit is respectively with process chip U's
GATE pin is connected with low-pass filter circuit.Current feedback circuit is then serially connected in gate driver circuit and process
Between the CS pin of chip U.In order to preferably implement the present invention, the described process preferred PT4107 of chip U
Integrated chip realizes.
This protection circuit is made up of electric capacity C1, fuse FU and diode D1.One end of fuse FU
Be connected with the positive pole of electric capacity C1, its other end then negative pole with electric capacity C1 is collectively forming this protection circuit
Input also connects power supply.The P pole of diode D1 is connected with the negative pole of electric capacity C1, its N pole then with linearly
The input of light adjusting circuit is connected.The positive pole of described electric capacity C1 is also connected with low-pass filter circuit.
It addition, this low-pass filter circuit is by audion VT1, electric capacity C2, electric capacity C3, resistance R3, resistance
R4, resistance R5, diode D2, diode D3, diode D4 and diode D5 form.
During connection, the positive pole of electric capacity C2 is connected with the positive pole of electric capacity C1, its minus earth.Resistance R3
It is serially connected between the negative pole of electric capacity C2 and the GND pin processing chip U.The N pole and three of diode D2
The emitter stage of pole pipe VT1 is connected, its P pole then negative pole with electric capacity C2 is connected.The negative pole of electric capacity C3
Be connected with the colelctor electrode of audion VT1, its positive pole then positive pole with electric capacity C1 is connected.Diode D4
N pole be connected with the positive pole of electric capacity C1, its P pole ground connection.The P pole of diode D3 and audion VT1
Base stage be connected, P pole with diode D4 after resistance R4, its N pole is connected.Diode D5's
P pole is connected with the VIN pin processing chip U, its N pole after resistance R5 with the N of diode D4
Pole is connected.The N pole of described diode D4 is also connected with gate driver circuit.
Gate driver circuit by audion VT3, field effect transistor MOS, resistance R6, resistance R7, electric capacity C5,
Diode D7 and inductance L2 composition.
One end of this resistance R6 is connected with the emitter stage of audion VT3, its other end ground connection.Electric capacity C5
Negative pole be connected with the colelctor electrode of audion VT3, its positive pole is then connected with the N pole of diode D4.
The P pole of diode D7 is connected with the drain electrode of field effect transistor MOS, its N pole after resistance R7 with electric capacity
The positive pole of C5 is connected.One end of inductance L2 is connected with the P pole of diode D7, its other end then with electricity
The positive pole holding C5 is collectively forming the outfan of this gate driver circuit and connects LED.Described audion VT3
Base stage be connected with the GATE pin processing chip U, its colelctor electrode then with the grid of field effect transistor MOS
Pole is connected.The source electrode of described field effect transistor MOS is then connected with current feedback circuit.
This current feedback circuit is by audion VT4, resistance R8, inductance L1, diode D6 and resistance
R2 forms.Wherein, one end of resistance R8 be connected with the colelctor electrode of audion VT4, its other end ground connection.
The N pole of diode D6 is connected with the CS pin processing chip U after resistance R2, its P pole is then through electricity
It is connected with the emitter stage of audion VT4 after sense L1.The base stage of described audion VT4 and field effect transistor MOS
Source electrode be connected.
As in figure 2 it is shown, this linearity light adjusting circuit is by bidirectional thyristor D8, audion VT5, resistance R9,
Potentiometer R10, resistance R11, resistance R12, resistance R13, diode D9, diode D10, electric capacity
C6 and electric capacity C7 composition.
During connection, the N pole of diode D10 is connected with the first anode of bidirectional thyristor D8, its P pole
Then the colelctor electrode with audion VT5 is connected.One end of resistance R9 is connected with the N pole of diode D10,
Its other end then after potentiometer R10 second plate with bidirectional thyristor D8 be connected.Resistance R11 goes here and there
It is connected between the N pole of diode D10 and the base stage of audion VT5.The positive pole of electric capacity C6 and audion VT5
Base stage be connected, its negative pole then second plate with bidirectional thyristor D8 is connected.Resistance R12 is serially connected in
Between emitter stage and the negative pole of electric capacity C6 of audion VT5.The positive pole of electric capacity C7 is with audion VT5's
Colelctor electrode is connected, its negative pole then negative pole with electric capacity C6 is connected.Resistance R13 is in parallel with electric capacity C7.
The P pole of diode D9 is connected with the control end of bidirectional thyristor D8, its N pole then with audion VT5
Base stage be connected.
Meanwhile, the first anode of described bidirectional thyristor D8 is as the input of this linearity light adjusting circuit and with two
The N pole of pole pipe D1 is connected, its second plate ground connection.The positive pole of described electric capacity C7 is as this linearity light adjusting
The outfan of circuit is also connected with the base stage of audion VT2.
Interference signal can be filtered by the present invention, so that its output electric current is more stable.Simultaneously this
Bright output electric current can also be detected, thus real-time output electric current is adjusted, further carry
The stability of its output electric current high.The present invention uses the integrated chip of PT4107 to combine peripheral circuit, makes the present invention
Can brightness to LED be adjusted according to demand, compared with traditional LED drive system, it is to LED
Linearity during brightness adjustment is more preferable, makes LED operation more stable, it is to avoid the phenomenon of flicker occur.
As it has been described above, just can well realize the present invention.
Claims (7)
1. one kind can the LED constant current output driving system of linearity light adjusting, it is characterised in that main by processing
Chip U, audion VT2, protection circuit, it is serially connected in protection circuit and the low pass filtered processed between chip U
Wave circuit, is serially connected in the linearity light adjusting circuit between base stage and the protection circuit of audion VT2, is serially connected in VT2
Colelctor electrode and the LD pin processing chip U between resistance R1, the emitter stage of positive pole and audion VT2
Be connected, negative pole then with the electric capacity C4 that is connected of RI pin processing chip U, respectively with process chip U
The gate driver circuit that is connected with low-pass filter circuit of GATE pin, and be serially connected in raster data model electricity
Current feedback circuit composition between road and the CS pin processing chip U.
2. according to described in claims 1 a kind of can the LED constant current output driving system of linearity light adjusting,
It is characterized in that, described linearity light adjusting circuit is by bidirectional thyristor D8, audion VT5, N pole and two-way crystalline substance
The diode D10 that the first anode of brake tube D8 is connected, P pole then colelctor electrode with audion VT5 is connected,
One end is connected with the N pole of diode D10, the other end then after potentiometer R10 with bidirectional thyristor D8
The resistance R9 that is connected of second plate, be serially connected in N pole and the base stage of audion VT5 of diode D10
Between resistance R11, positive pole is connected with the base stage of audion VT5, negative pole then with bidirectional thyristor D8
The electric capacity C6 that is connected of second plate, be serially connected in the emitter stage of audion VT5 and electric capacity C6 negative pole it
Between resistance R12, positive pole is connected with the colelctor electrode of audion VT5, negative pole then with the negative pole phase of electric capacity C6
Electric capacity C7, the resistance R13 being in parallel with electric capacity C7 connected, and the control of P pole and bidirectional thyristor D8
The diode D9 composition that end processed is connected, N pole then base stage with audion VT5 is connected；Described two-way
The first anode of IGCT D8 as the input of this linearity light adjusting circuit and be connected with protection circuit, its
Two plus earths；The positive pole of described electric capacity C7 as this linearity light adjusting circuit outfan and with audion VT2
Base stage be connected.
3. according to described in claims 2 a kind of can the LED constant current output driving system of linearity light adjusting,
It is characterized in that, described protection circuit is by electric capacity C1, and one end is connected with the positive pole of electric capacity C1, the other end
Then the negative pole with electric capacity C1 is collectively forming the fuse FU of input of this protection circuit, and P pole and electricity
Hold the diode D1 composition that negative pole is connected, N pole then input with linearity light adjusting circuit is connected of C1；
The positive pole of described electric capacity C1 is also connected with low-pass filter circuit.
4. according to described in claims 3 a kind of can the LED constant current output driving system of linearity light adjusting,
It is characterized in that, described low-pass filter circuit by audion VT1, positive pole is connected with the positive pole of electric capacity C1,
The electric capacity C2 of minus earth, is serially connected between the negative pole of electric capacity C2 and the GND pin processing chip U
Resistance R3, N pole is connected with the emitter stage of audion VT1, P pole then negative pole with electric capacity C2 is connected
Diode D2, negative pole is connected with the colelctor electrode of audion VT1, positive pole then with the positive pole phase of electric capacity C1
Electric capacity C3, the N pole connected is connected with the positive pole of electric capacity C1, diode D4, the P pole of P pole ground connection and
Two poles that the base stage of audion VT1 is connected, N pole is connected with the P pole of diode D4 after resistance R4
Pipe D3, and P pole with process chip U VIN pin be connected, N pole after resistance R5 with diode
The diode D5 composition that the N pole of D4 is connected；The N pole of described diode D4 also with gate driver circuit
It is connected.
5. according to described in claims 4 a kind of can the LED constant current output driving system of linearity light adjusting,
It is characterized in that, described gate driver circuit is by audion VT3, field effect transistor MOS, one end and audion
The emitter stage of VT3 is connected, the resistance R6 of other end ground connection, and negative pole is connected with the colelctor electrode of audion VT3
Connect, the drain electrode of electric capacity C5, P pole that positive pole is then connected with the N pole of diode D4 and field effect transistor MOS
Be connected, diode D7 that N pole positive pole with electric capacity C5 after resistance R7 is connected, and one end and two
The P pole of pole pipe D7 is connected, the other end then positive pole with electric capacity C5 is collectively forming this gate driver circuit
The inductance L2 composition of outfan；The base stage of described audion VT3 and the GATE pin phase processing chip U
Connect, its colelctor electrode is then connected with the grid of field effect transistor MOS；The source electrode of described field effect transistor MOS
Then it is connected with current feedback circuit.
6. according to described in claims 5 a kind of can the LED constant current output driving system of linearity light adjusting,
It is characterized in that, described current feedback circuit by audion VT4, the colelctor electrode phase of one end and audion VT4
Connect, the resistance R8 of other end ground connection, and N pole after resistance R2 with process chip U CS pin
Be connected, the P pole diode D6 composition that then emitter stage with audion VT4 is connected after inductance L1；
The described base stage of audion VT4 is connected with the source electrode of field effect transistor MOS.
7. according to described in claims 6 a kind of can the LED constant current output driving system of linearity light adjusting,
It is characterized in that, described process chip U is the integrated chip of PT4107.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610370318.8A CN105848363A (en) | 2016-05-28 | 2016-05-28 | Linear dimming LED constant-current output driving system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610370318.8A CN105848363A (en) | 2016-05-28 | 2016-05-28 | Linear dimming LED constant-current output driving system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105848363A true CN105848363A (en) | 2016-08-10 |
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ID=56595836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610370318.8A Pending CN105848363A (en) | 2016-05-28 | 2016-05-28 | Linear dimming LED constant-current output driving system |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601532A (en) * | 2019-08-29 | 2019-12-20 | 赵福合 | Current-reducing regulator chip |
-
2016
- 2016-05-28 CN CN201610370318.8A patent/CN105848363A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601532A (en) * | 2019-08-29 | 2019-12-20 | 赵福合 | Current-reducing regulator chip |
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| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160810 |
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| WD01 | Invention patent application deemed withdrawn after publication |