CN105960052A - Electromagnetic interference free white light LED current-constant driving system - Google Patents
Electromagnetic interference free white light LED current-constant driving system Download PDFInfo
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- CN105960052A CN105960052A CN201610347531.7A CN201610347531A CN105960052A CN 105960052 A CN105960052 A CN 105960052A CN 201610347531 A CN201610347531 A CN 201610347531A CN 105960052 A CN105960052 A CN 105960052A
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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]
- H05B45/40—Details of LED load circuits
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Abstract
The invention discloses an electromagnetic interference free white light LED current-constant driving system. The system is characterized by comprising a control chip U, an amplifier P1, a resistor R4 connected in series between the output end of the amplifier P1 and a pin EN of the control chip U, a diode D3, a constant current source circuit connected with both the anode of the amplifier P1 and a pin VIN of the control chip U, a triode driving circuit connected with a pin BOOST of the control chip U, a current feedback circuit connected with a pin FB of the control chip U, and a demagnetizing circuit connected in series between a pin SW of the control chip U and the triode driving circuit, wherein the pole P of the diode D3 is connected with the cathode of the amplifier P1, and the pole N of the diode D3 is connected with a pin GND of the control chip U. The system can filter interference electromagnetic waves generated by the system itself, the system stability is improved, and compared with a traditional LED driving system, the anti-interference capability is higher.
Description
Technical field
The present invention relates to a kind of LED drive system, specifically refer to a kind of white light LEDs constant current without electromagnetic interference
Drive system.
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.Owing to LED is different from traditional electric filament lamp, therefore
Its needs are driven by special drive system.But, the LED drive system that current people are used
Owing to its circuit design is unreasonable, it is impossible to guarantee to export the stability of electric current, it is easily caused LED and works not
Stable, affect illuminating effect.
Summary of the invention
It is an object of the invention to overcome lacking of the driving LED that traditional LED drive system cannot be stable
Fall into, it is provided that a kind of white light LEDs constant current driving system without electromagnetic interference.
The purpose of the present invention is achieved through the following technical solutions: a kind of white light LEDs constant current without electromagnetic interference is driven
Dynamic system, mainly by control chip U, amplifier P1, it is serially connected in outfan and the control chip of amplifier P1
Resistance R4, P pole between the EN pin of U is connected with the negative pole of amplifier P1, N pole and control chip
The diode D3 that the GND pin of U is connected, simultaneously with the positive pole of amplifier P1 and control chip U
The constant-current source circuit that VIN pin is connected, the audion being connected with the BOOST pin of control chip U
Drive circuit, the current feedback circuit being connected with the FB pin of control chip U, and it is serially connected in control
Degaussing circuit composition between SW pin and the transistor drive circuit of chip U；Described current feedback circuit
Also it is connected with transistor drive circuit；The GND pin ground connection of described control chip U.
Further, described degaussing circuit by processing chip U1, audion VT5, audion VT6, N pole
Be connected with the base stage of audion VT5, P pole is then as the diode D8, N of input of this degaussing circuit
Pole is connected with the emitter stage of audion VT5, P pole P with diode D8 after resistance R11 is extremely connected
The diode D9 connect, negative pole is connected with the base stage of audion VT5, positive pole then with the collection of audion VT5
The electric capacity C8 that electrode is connected, positive pole is connected with the emitter stage of audion VT5, the electric capacity of minus earth
C9, P pole is connected with the negative pole of electric capacity C9, N pole is managed with the CV processing chip U1 after resistance R14
The diode D10 that foot is connected, one end is connected with the THR pin processing chip U1, the other end is through electricity
The resistance R13 being connected with the R pin processing chip U1 after resistance R12, positive pole and the R processing chip U1
Pin is connected, electric capacity C10, the P pole of minus earth is connected with the Q pin processing chip U1, N pole
The diode D11 that then base stage with audion VT6 is connected, positive pole and the C V pin processing chip U1
Be connected, the electric capacity C11 of minus earth, be serially connected in emitter stage and the negative pole of electric capacity C11 of audion VT6
Between resistance R15, and P pole is connected with the colelctor electrode of audion VT6, N pole is then as this demagnetization
The diode D12 composition of the outfan of circuit；The R pin of described process chip U1 connect 5V voltage, its
DIS pin is connected with the colelctor electrode of audion VT5, its THR pin then negative pole with electric capacity C9 is connected
Connect, its TR pin then emitter stage with audion VT5 is connected, its VCC pin is then connected with R pin
Connect；The input of described degaussing circuit is connected with the SW pin of control chip U, its outfan is then with three
Pole tube drive circuit is connected.
Described constant-current source circuit by audion VT1, audion VT2, positive pole after resistance R2 with audion
The electric capacity C1 that the base stage of VT1 is connected, negative pole then base stage with audion VT2 is connected, is serially connected in electric capacity
Resistance R1, N pole between positive pole and the emitter stage of audion VT1 of C1 and the colelctor electrode of audion VT2
Be connected, diode D2, N pole that P pole then base stage with audion VT1 is connected and audion VT1
The Zener diode D1 that colelctor electrode is connected, P pole then base stage with audion VT2 is connected, and negative
Pole is connected with the emitter stage of audion VT2, positive pole base stage with audion VT2 after resistance R3 is connected
The electric capacity C2 composition connect；The positive pole of described electric capacity C1 connects power supply；The emitter stage of described audion VT2 and control
The VIN pin of coremaking sheet U is connected；The positive pole of described amplifier P1 then positive pole with electric capacity C2 is connected.
Described transistor drive circuit is by audion VT3, audion VT4, electric capacity C7, positive pole and control core
The electric capacity C3, N that the BOOST pin of sheet U is connected, negative pole then base stage with audion VT3 is connected
Pole is connected with the emitter stage of audion VT3, the Zener diode D4 of P pole ground connection, negative pole and voltage stabilizing two pole
The electric capacity C5 that the P pole of pipe D4 is connected, positive pole positive pole with electric capacity C3 after resistance R8 is connected；String
The inductance L being connected between the colelctor electrode of audion VT3 and the base stage of audion VT4；N pole and audion
The emitter stage of VT4 is connected, P pole diode D7 of ground connection after resistance R9, and is serially connected in audion
LED composition between emitter stage and the positive pole of electric capacity C7 of VT4；The minus earth of described electric capacity C7,
Its positive pole is then connected with current feedback circuit；The base stage of described audion VT4 and the positive pole phase of electric capacity C5
Connect；The described base stage of audion VT3 is connected with the outfan of degaussing circuit.
Described current feedback circuit, by amplifier P2, is serially connected in positive pole and the positive pole of electric capacity C7 of amplifier P2
Between resistance R10, N pole be connected with the FB pin of control chip U, P pole after resistance R7 with put
The diode D5 that the outfan of big device P2 is connected, positive pole is connected with the outfan of amplifier P2, negative pole
Electric capacity C6, the P pole that then negative pole with amplifier P2 is connected is connected with the negative pole of amplifier P2, N pole
The diode D6 of ground connection.One end is connected with the N pole of diode D5, the other end after resistance R6 with two
The resistance R5 that the N pole of pole pipe D6 is connected, and positive pole is connected with the P pole of diode D5, negative pole
The electric capacity C4 composition being connected with the N pole of diode D6.
Described control chip U is the integrated chip of LM2734X, and described process chip U1 is that NE555 is integrated
Chip.
The present invention compared with the prior art, has the following advantages and beneficial effect:
(1) present invention uses the integrated chip of LM2734X to combine with unique peripheral circuit, and it can be examined
Survey the real time operation electric current of LED, and in real time the operating current of LED is adjusted, it is to avoid current wave
Move and affect the stability of LED work.
(2) present invention uses the combination of the integrated chip of LM2734X and peripheral circuit, can make the present invention's
Structure is simpler, and the traditional LED drive system of observable index has saved 30%.
(3) present invention can filter disturbing electromagnetic wave produced by system self, improves system
Stability, compared with traditional LED drive system, its capacity of resisting disturbance is higher.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram of the present invention.
Fig. 2 is the structure chart of the degaussing 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 white light LEDs constant current driving system of the present invention, mainly by control chip U, amplify
Device P1, resistance R4, diode D3, constant-current source circuit, degaussing circuit, transistor drive circuit and electricity
Current feedback circuit forms.
Wherein, this resistance R4 is serially connected between the outfan of amplifier P1 and the EN pin of control chip U.
The P pole of diode D3 is connected with the negative pole of amplifier P1, the GND of its N pole and control chip U pipe
Foot is connected.Constant-current source circuit is connected with the positive pole of amplifier P1 and the VIN pin of control chip U simultaneously
Connect.Transistor drive circuit is then connected with the BOOST pin of control chip U.Current feedback circuit is then
It is connected with the FB pin of control chip U.Degaussing circuit be then serially connected in control chip U SW pin and
Between transistor drive circuit.Described current feedback circuit is also connected with transistor drive circuit；Described control
The GND pin ground connection of coremaking sheet U.In order to preferably implement the present invention, U is preferred for this control chip
The integrated chip of LM2734X.
Further, constant-current source circuit by audion VT1, audion VT2, resistance R1, resistance R2,
Electric capacity C1, electric capacity C2, resistance R3, Zener diode D1 and diode D2 form.
Wherein, the positive pole of electric capacity C1 base stage with audion VT1 after resistance R2 be connected, its negative pole then
It is connected with the base stage of audion VT2.Resistance R1 is serially connected in the positive pole of electric capacity C1 and audion VT1's
Between emitter stage.The N pole of diode D2 is connected with the colelctor electrode of audion VT2, its P pole is then with three
The base stage of pole pipe VT1 is connected.The N pole of Zener diode D1 is connected with the colelctor electrode of audion VT1,
Its P pole then base stage with audion VT2 is connected.The negative pole of electric capacity C2 and the emitter stage of audion VT2
Be connected, its positive pole base stage with audion VT2 after resistance R3 is connected.The positive pole of described electric capacity C1
Connect power supply；The emitter stage of described audion VT2 is connected with the VIN pin of control chip U；Described amplification
The positive pole of device P1 then positive pole with electric capacity C2 is connected.
It addition, transistor drive circuit is by audion VT3, audion VT4, electric capacity C7, electric capacity C3,
Electric capacity C5, inductance L, resistance R8, resistance R9, LED VD, Zener diode D4 and diode
D7 forms.
During connection, the positive pole of electric capacity C3 is connected with the BOOST pin of control chip U, its negative pole then with
The base stage of audion VT3 is connected.The N pole of Zener diode D4 is connected with the emitter stage of audion VT3
Connect, its P pole ground connection.The negative pole of electric capacity C5 is connected with the P pole of Zener diode D4, its positive pole is through electricity
It is connected with the positive pole of electric capacity C3 after resistance R8.Inductance L is serially connected in colelctor electrode and the audion of audion VT3
Between the base stage of VT4.The N pole of diode D7 is connected with the emitter stage of audion VT4, its P pole warp
Ground connection after resistance R9.LED is then serially connected between the emitter stage of audion VT4 and the positive pole of electric capacity C7.
The minus earth of described electric capacity C7, its positive pole are then connected with current feedback circuit.Described audion
The base stage of VT4 is connected with the positive pole of electric capacity C5.The base stage of described audion VT3 then with degaussing circuit
Outfan is connected.
Described current feedback circuit by amplifier P2, resistance R5, resistance R6, resistance R7, resistance R10,
Diode D5, diode D6, electric capacity C4 warp and electric capacity C6 composition.
During connection, resistance R10 is serially connected between the positive pole of amplifier P2 and the positive pole of electric capacity C7.Diode
The N pole of D5 is connected with the FB pin of control chip U, its P pole after resistance R7 with amplifier P2
Outfan be connected.The positive pole of electric capacity C6 is connected with the outfan of amplifier P2, its negative pole then with put
The negative pole of big device P2 is connected.The P pole of diode D6 is connected with the negative pole of amplifier P2, its N pole
Ground connection.One end of resistance R5 is connected with the N pole of diode D5, its other end after resistance R6 with two
The N pole of pole pipe D6 is connected.The positive pole of electric capacity C4 is connected with the P pole of diode D5, its negative pole with
The N pole of diode D6 is connected.
As described in Figure 2, this degaussing circuit by processing chip U1, audion VT5, audion VT6, resistance
R11, resistance R12, resistance R13, resistance R14, resistance R15, diode D8, diode D9, two
Pole pipe D10, diode D11, diode D12, electric capacity C8, electric capacity C9, electric capacity C10 and electric capacity
C11 forms.
During connection, the N pole of diode D8 is connected with the base stage of audion VT5, the then conduct of its P pole should
The input of degaussing circuit is also connected with the SW pin of control chip U.The N pole and three of diode D9
The emitter stage of pole pipe VT5 is connected, P pole with diode D8 after resistance R11, its P pole is connected.
The negative pole of electric capacity C8 is connected with the base stage of audion VT5, its positive pole then with the colelctor electrode of audion VT5
It is connected.The positive pole of electric capacity C9 is connected with the emitter stage of audion VT5, its minus earth.Diode
The P pole of D10 is connected with the negative pole of electric capacity C9, its N pole after resistance R14 with process chip U1
CV pin is connected.One end of resistance R13 with process chip U1 THR pin be connected, its another
End is connected with the R pin processing chip U1 after resistance R12.The positive pole of electric capacity C10 and process chip
The R pin of U1 is connected, its minus earth.The P pole of diode D11 and the Q pin processing chip U1
Be connected, its N pole then base stage with audion VT6 is connected.The positive pole of electric capacity C11 and process chip
The C V pin of U1 is connected, its minus earth.Resistance R15 be serially connected in audion VT6 emitter stage and
Between the negative pole of electric capacity C11.The P pole of diode D12 is connected with the colelctor electrode of audion VT6, base N
Pole then as the outfan of this degaussing circuit and is connected with the base stage of audion VT3.
Meanwhile, the R pin of described process chip U1 meets 5V voltage, its DIS pin and audion VT5
Colelctor electrode be connected, its THR pin then negative pole with electric capacity C9 is connected, its TR pin is then with three
The emitter stage of pole pipe VT5 is connected, its VCC pin is then connected with R pin.In order to preferably implement
The present invention, this process chip U1 integrated chip of preferred NE555 realizes.
The present invention uses the integrated chip of LM2734X to combine with unique peripheral circuit, and it can make the present invention
Operating current more stable, and the present invention can also detect the real time operation electric current of LED, and in real time
The operating current of LED is adjusted, it is to avoid current fluctuation and affect LED work stability.With
Time, the structure of the present invention is simpler, and the traditional LED drive system of observable index has saved 30%.This
Invention can be filtered disturbing electromagnetic wave produced by system self, improves the stability of system, with
Traditional LED drive system is compared, and its capacity of resisting disturbance is higher.
As it has been described above, just can well realize the present invention.
Claims (6)
1. the white light LEDs constant current driving system without electromagnetic interference, it is characterised in that main by controlling
Chip U, amplifier P1, be serially connected between the outfan of amplifier P1 and the EN pin of control chip U
Resistance R4, P pole is connected with the negative pole of amplifier P1, N pole is connected with the GND pin of control chip U
The diode D3 connect, the perseverance being simultaneously connected with the positive pole of amplifier P1 and the VIN pin of control chip U
Current source circuit, the transistor drive circuit being connected with the BOOST pin of control chip U, with control core
The current feedback circuit that the FB pin of sheet U is connected, and be serially connected in control chip U SW pin and
Degaussing circuit composition between transistor drive circuit；Described current feedback circuit also with transistor drive circuit
It is connected；The GND pin ground connection of described control chip U.
2. according to a kind of white light LEDs constant current driving system without electromagnetic interference described in claims 1,
It is characterized in that, described degaussing circuit by processing chip U1, audion VT5, audion VT6, N pole with
The base stage of audion VT5 is connected, P pole is then as diode D8, the N pole of input of this degaussing circuit
Be connected with the emitter stage of audion VT5, P pole with diode D8 after resistance R11, P pole is connected
Diode D9, negative pole is connected with the base stage of audion VT5, positive pole then with the current collection of audion VT5
The electric capacity C8 that pole is connected, positive pole is connected with the emitter stage of audion VT5, the electric capacity C9 of minus earth,
P pole is connected with the negative pole of electric capacity C9, N pole after resistance R14 with process chip U1 CV pin phase
The diode D10 connected, one end is connected with the THR pin of process chip U1, the other end is through resistance R12
The resistance R13 being connected with the R pin processing chip U1 afterwards, positive pole and the R pin phase processing chip U1
Connect, electric capacity C10, the P pole of minus earth is connected with the Q pin of process chip U1, N pole is then with three
The diode D11 that the base stage of pole pipe VT6 is connected, positive pole with process chip U1 C V pin be connected,
The electric capacity C11 of minus earth, is serially connected in the electricity between the emitter stage of audion VT6 and the negative pole of electric capacity C11
Resistance R15, and P pole is connected with the colelctor electrode of audion VT6, N pole then defeated as this degaussing circuit
Go out the diode D12 composition of end；The R pin of described process chip U1 connects 5V voltage, its DIS pin
Be connected with the colelctor electrode of audion VT5, its THR pin then negative pole with electric capacity C9 is connected, its TR
Pin then emitter stage with audion VT5 is connected, its VCC pin is then connected with R pin；Described
The input of degaussing circuit is connected with the SW pin of control chip U, its outfan then drives with audion
Circuit is connected.
3. according to a kind of white light LEDs constant current driving system without electromagnetic interference described in claims 2,
It is characterized in that, described constant-current source circuit by audion VT1, audion VT2, positive pole after resistance R2 with
The electric capacity C1 that the base stage of audion VT1 is connected, negative pole then base stage with audion VT2 is connected, string
Resistance R1, the N pole being connected between the positive pole of electric capacity C1 and the emitter stage of audion VT1 and audion VT2
Diode D2, the N pole that colelctor electrode is connected, P pole then base stage with audion VT1 is connected and three poles
The Zener diode D1 that the colelctor electrode of pipe VT1 is connected, P pole then base stage with audion VT2 is connected,
And negative pole is connected with the emitter stage of audion VT2, positive pole after resistance R3 with the base of audion VT2
The electric capacity C2 composition that pole is connected；The positive pole of described electric capacity C1 connects power supply；The transmitting of described audion VT2
Pole is connected with the VIN pin of control chip U；The positive pole of described amplifier P1 then with the positive pole of electric capacity C2
It is connected.
4. according to a kind of white light LEDs constant current driving system without electromagnetic interference described in claims 3,
It is characterized in that, described transistor drive circuit is by audion VT3, audion VT4, electric capacity C7, positive pole
Be connected with the BOOST pin of control chip U, electricity that negative pole then base stage with audion VT3 is connected
Appearance C3, N pole is connected with the emitter stage of audion VT3, the Zener diode D4 of P pole ground connection, negative pole
Be connected with the P pole of Zener diode D4, positive pole positive pole with electric capacity C3 after resistance R8 is connected
Electric capacity C5；The inductance L being serially connected between the colelctor electrode of audion VT3 and the base stage of audion VT4；N
Pole is connected with the emitter stage of audion VT4, P pole diode D7 of ground connection after resistance R9, and string
The LED composition being connected between the emitter stage of audion VT4 and the positive pole of electric capacity C7；Described electric capacity C7
Minus earth, its positive pole is then connected with current feedback circuit；The base stage of described audion VT4 and electric capacity
The positive pole of C5 is connected；The described base stage of audion VT3 is connected with the outfan of degaussing circuit.
5. according to a kind of white light LEDs constant current driving system without electromagnetic interference described in claims 4,
It is characterized in that, described current feedback circuit, by amplifier P2, is serially connected in positive pole and the electric capacity of amplifier P2
Resistance R10, N pole between the positive pole of C7 is connected with the FB pin of control chip U, P pole is through resistance
The diode D5 that after R7, outfan with amplifier P2 is connected, the outfan phase of positive pole and amplifier P2
Connect, the negative pole phase of electric capacity C6, P pole that negative pole then negative pole with amplifier P2 is connected and amplifier P2
Connection, the diode D6 of N pole ground connection.One end is connected with the N pole of diode D5, the other end is through resistance
The resistance R5 being connected with the N pole of diode D6 after R6, and positive pole is extremely connected with the P of diode D5
Connect, electric capacity C4 that negative pole is connected with the N pole of diode D6 composition.
6. a kind of white light LEDs constant current driving system without electromagnetic interference stated according to claims 5, it is special
Levying and be, described control chip U is the integrated chip of LM2734X, and described process chip U1 is NE555
Integrated chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610347531.7A CN105960052A (en) | 2016-05-23 | 2016-05-23 | Electromagnetic interference free white light LED current-constant driving system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610347531.7A CN105960052A (en) | 2016-05-23 | 2016-05-23 | Electromagnetic interference free white light LED current-constant driving system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105960052A true CN105960052A (en) | 2016-09-21 |
Family
ID=56909494
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610347531.7A Withdrawn CN105960052A (en) | 2016-05-23 | 2016-05-23 | Electromagnetic interference free white light LED current-constant driving system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105960052A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849629A (en) * | 2017-02-28 | 2017-06-13 | 深圳市华星光电技术有限公司 | A kind of protection circuit and LED drive circuit |
-
2016
- 2016-05-23 CN CN201610347531.7A patent/CN105960052A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849629A (en) * | 2017-02-28 | 2017-06-13 | 深圳市华星光电技术有限公司 | A kind of protection circuit and LED drive circuit |
| US10278257B2 (en) | 2017-02-28 | 2019-04-30 | Shenzhen China Star Optoelectronics Technology Co., Ltd. | Protection circuit and LED driving circuit |
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Application publication date: 20160921 |