CN105813275A - White-light LED constant current drive system - Google Patents
White-light LED constant current drive system Download PDFInfo
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- CN105813275A CN105813275A CN201610347480.8A CN201610347480A CN105813275A CN 105813275 A CN105813275 A CN 105813275A CN 201610347480 A CN201610347480 A CN 201610347480A CN 105813275 A CN105813275 A CN 105813275A
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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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- 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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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Abstract
The invention discloses a white-light LED constant current drive system which is characterized by being mainly composed of a control chip U, an amplifier P1, a resistor R4, a diode D3, a constant current source circuit, a triode drive circuit and a current feedback circuit, wherein the resistor R4 is connected between the output end of the amplifier P1 and EN pin of the control chip U in series; the P pole of the diode D3 is connected with the negative pole of the amplifier P1, and the N pole of the diode D3 is connected with the GND pin of the chip U; the constant current source circuit is connected with the pin of the positive pole of the P1 and the VIN pin of the control chip U at the same time; the triode drive circuit is connected with the BOOST pin of the control chip U and the SW pin; the current feedback circuit is connected with the FB pin of the control chip U; the current feedback circuit is further connected with the triode drive circuit; the GND pin of the control chip U is grounded.According to the white-light LED constant current drive system, an LM 2734 X integrated chip is combined with a unique peripheral circuit, a real-time work current of an LED lamp can be detected, the work current of the LED lamp is adjusted in real time, and the situation that work stability of the LED lamp is affected by current fluctuation is avoided.
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 driving system.
Background technology
At present, due to LED have that energy consumption is low, the feature such as long service life and safety and environmental protection, one of its main product having had become as 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 use is unreasonable due to its circuit design, it is impossible to guarantee the stability of output electric current, it is easy to cause LED job insecurity, affect illuminating effect.
Summary of the invention
It is an object of the invention to overcome the defect of the driving LED that traditional LED drive system cannot be stable, it is provided that a kind of white light LEDs constant current driving system.
The purpose of the present invention is achieved through the following technical solutions: a kind of white light LEDs constant current driving system, main by control chip U, amplifier P1, it is serially connected in the resistance R4 between the outfan of amplifier P1 and the EN pin of control chip U, P pole is connected with the negative pole of amplifier P1, the diode D3 that N pole is connected with the GND pin of control chip U, the constant-current source circuit being simultaneously connected with the positive pole of amplifier P1 and the VIN pin of control chip U, the transistor drive circuit being simultaneously connected with BOOST pin and the SW pin of control chip U, and the current feedback circuit composition being connected with the FB pin of control chip U；Described current feedback circuit is also connected with transistor drive circuit；The GND pin ground connection of described control chip U.
Further, described constant-current source circuit is by audion VT1, audion VT2, positive pole is connected with the base stage of audion VT1 after resistance R2, the electric capacity C1 that negative pole is then connected with the base stage of audion VT2, it is serially connected in the resistance R1 between the positive pole of electric capacity C1 and the emitter stage of audion VT1, N pole is connected with the colelctor electrode of audion VT2, the diode D2 that P pole is then connected with the base stage of audion VT1, N pole is connected with the colelctor electrode of audion VT1, the Zener diode D1 that P pole is then connected with the base stage of audion VT2, and negative pole is connected with the emitter stage of audion VT2, the electric capacity C2 composition that positive pole is connected with the base stage of audion VT2 after resistance R3；The positive pole of described electric capacity C1 connects power supply；The emitter stage of described audion VT2 is connected with the VIN pin of control chip U；The positive pole of described amplifier P1 is then connected with the positive pole of electric capacity C2.
Described transistor drive circuit is by audion VT3, audion VT4, electric capacity C7, the electric capacity C3 that positive pole is connected with the BOOST pin of control chip U, negative pole is then connected with the base stage of audion VT3, N pole is connected with the emitter stage of audion VT3, the Zener diode D4 of P pole ground connection, the electric capacity C5 that negative pole is connected with the P pole of Zener diode D4, positive pole is connected with the positive pole of electric capacity C3 after resistance R8；It is serially connected in the inductance L 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 is serially connected in the LED composition 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；The base stage of described audion VT4 is connected with the positive pole of electric capacity C5；The base stage of described audion VT3 is connected with the SW pin of control chip U.
Described current feedback circuit is by amplifier P2, it is serially connected in the resistance R10 between the positive pole of amplifier P2 and the positive pole of electric capacity C7, the diode D5 that N pole is connected with the FB pin of control chip U, P pole is connected with the outfan of amplifier P2 after resistance R7, electric capacity C6, the P pole that positive pole is connected with the outfan of amplifier P2, negative pole is then connected with the negative pole of amplifier P2 is connected with the negative pole of amplifier P2, the diode D6 of N pole ground connection.The resistance R5 that one end is connected with the N pole of diode D5, the other end is connected with the N pole of diode D6 after resistance R6, and the electric capacity C4 composition that positive pole is connected with the P pole of diode D5, negative pole is connected with the N pole of diode D6.
Described control chip U is LM2734X integrated chip.
The present invention compared with the prior art, has the following advantages and beneficial effect:
(1) present invention adopts LM2734X integrated chip to combine with unique peripheral circuit, and it can 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 the stability of LED work.
(2) present invention adopts the combination of LM2734X integrated chip and peripheral circuit, it is possible to the structure making the present invention is simpler, and the traditional LED drive system of observable index has saved 30%.
Accompanying drawing explanation
Fig. 1 is the overall structure schematic diagram 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 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, amplifier P1, resistance R4, diode D3, constant-current source circuit, transistor drive circuit and current feedback circuit form.
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, its N pole is connected with the GND pin of control chip U.Constant-current source circuit is connected with the positive pole of amplifier P1 and the VIN pin of control chip U simultaneously.Transistor drive circuit is connected with BOOST pin and the SW pin of control chip U simultaneously.Current feedback circuit is then connected with the FB pin of control chip U.Described current feedback circuit is also connected with transistor drive circuit；The GND pin ground connection of described control chip U.In order to better implement the present invention, the preferred LM2734X integrated chip of this control chip U.
Further, constant-current source circuit is made up of audion VT1, audion VT2, resistance R1, resistance R2, electric capacity C1, electric capacity C2, resistance R3, Zener diode D1 and diode D2.
Wherein, the positive pole of electric capacity C1 is connected with the base stage of audion VT1 after resistance R2, its negative pole is then connected with the base stage of audion VT2.Resistance R1 is serially connected between the positive pole of electric capacity C1 and the emitter stage of audion VT1.The N pole of diode D2 is connected with the colelctor electrode of audion VT2, its P pole is then connected with the base stage of audion VT1.The N pole of Zener diode D1 is connected with the colelctor electrode of audion VT1, its P pole is then connected with the base stage of audion VT2.The negative pole of electric capacity C2 is connected with the emitter stage of audion VT2, its positive pole is connected with the base stage of audion VT2 after resistance R3.The positive pole of described electric capacity C1 connects power supply；The emitter stage of described audion VT2 is connected with the VIN pin of control chip U；The positive pole of described amplifier P1 is then connected with the positive pole of electric capacity C2.
It addition, transistor drive circuit is made up of 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.
During connection, the positive pole of electric capacity C3 is connected with the BOOST pin of control chip U, its negative pole is then connected with the base stage of audion VT3.The N pole of Zener diode D4 is connected with the emitter stage of audion VT3, 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 connected with the positive pole of electric capacity C3 after resistance R8.Inductance L is serially connected between the colelctor electrode of audion VT3 and the base stage of audion VT4.The N pole of diode D7 is connected with the emitter stage of audion VT4, its P pole 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.The base stage of described audion VT4 is connected with the positive pole of electric capacity C5.The base stage of described audion VT3 is connected with the SW pin of control chip U.
Described current feedback circuit is 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.The N pole of diode D5 is connected with the FB pin of control chip U, its P pole is connected with the outfan of amplifier P2 after resistance R7.The positive pole of electric capacity C6 is connected with the outfan of amplifier P2, its negative pole is then connected with the negative pole of amplifier P2.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 N pole with diode D6 after resistance R6 is connected.The positive pole of electric capacity C4 is connected with the P pole of diode D5, its negative pole is connected with the N pole of diode D6.
The present invention adopts LM2734X integrated chip to combine with unique peripheral circuit, it can make the operating current of the present invention 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 the stability of LED work.Meanwhile, the structure of the present invention is simpler, and the traditional LED drive system of observable index has saved 30%.
As it has been described above, just can well realize the present invention.
Claims (5)
1. a white light LEDs constant current driving system, it is characterized in that, main by control chip U, amplifier P1, it is serially connected in the resistance R4 between the outfan of amplifier P1 and the EN pin of control chip U, P pole is connected with the negative pole of amplifier P1, the diode D3 that N pole is connected with the GND pin of control chip U, the constant-current source circuit being simultaneously connected with the positive pole of amplifier P1 and the VIN pin of control chip U, the transistor drive circuit being simultaneously connected with BOOST pin and the SW pin of control chip U, and the current feedback circuit composition being connected with the FB pin of control chip U；Described current feedback circuit is also connected with transistor drive circuit；The GND pin ground connection of described control chip U.
null2. a kind of white light LEDs constant current driving system according to claims 1，It is characterized in that，Described constant-current source circuit is by audion VT1，Audion VT2，Positive pole is connected with the base stage of audion VT1 after resistance R2、The electric capacity C1 that negative pole is then connected with the base stage of audion VT2，It is serially connected in the resistance R1 between the positive pole of electric capacity C1 and the emitter stage of audion VT1，N pole is connected with the colelctor electrode of audion VT2、The diode D2 that P pole is then connected with the base stage of audion VT1，N pole is connected with the colelctor electrode of audion VT1、The Zener diode D1 that P pole is then connected with the base stage of audion VT2，And negative pole is connected with the emitter stage of audion VT2、The electric capacity C2 composition that positive pole is connected with the base stage of audion VT2 after resistance R3；The positive pole of described electric capacity C1 connects power supply；The emitter stage of described audion VT2 is connected with the VIN pin of control chip U；The positive pole of described amplifier P1 is then connected with the positive pole of electric capacity C2.
3. a kind of white light LEDs constant current driving system according to claims 2, it is characterized in that, described transistor drive circuit is by audion VT3, audion VT4, electric capacity C7, the electric capacity C3 that positive pole is connected with the BOOST pin of control chip U, negative pole is then connected with the base stage of audion VT3, N pole is connected with the emitter stage of audion VT3, the Zener diode D4 of P pole ground connection, the electric capacity C5 that negative pole is connected with the P pole of Zener diode D4, positive pole is connected with the positive pole of electric capacity C3 after resistance R8；It is serially connected in the inductance L 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 is serially connected in the LED composition 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；The base stage of described audion VT4 is connected with the positive pole of electric capacity C5；The base stage of described audion VT3 is connected with the SW pin of control chip U.
4. a kind of white light LEDs constant current driving system according to claims 3, it is characterized in that, described current feedback circuit is by amplifier P2, it is serially connected in the resistance R10 between the positive pole of amplifier P2 and the positive pole of electric capacity C7, the diode D5 that N pole is connected with the FB pin of control chip U, P pole is connected with the outfan of amplifier P2 after resistance R7, electric capacity C6, the P pole that positive pole is connected with the outfan of amplifier P2, negative pole is then connected with the negative pole of amplifier P2 is connected with the negative pole of amplifier P2, the diode D6 of N pole ground connection.The resistance R5 that one end is connected with the N pole of diode D5, the other end is connected with the N pole of diode D6 after resistance R6, and the electric capacity C4 composition that positive pole is connected with the P pole of diode D5, negative pole is connected with the N pole of diode D6.
5. a kind of white light LEDs constant current driving system stated according to claims 4, it is characterised in that described control chip U is LM2734X integrated chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610347480.8A CN105813275A (en) | 2016-05-23 | 2016-05-23 | White-light LED constant current drive system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610347480.8A CN105813275A (en) | 2016-05-23 | 2016-05-23 | White-light LED constant current drive system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105813275A true CN105813275A (en) | 2016-07-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610347480.8A Withdrawn CN105813275A (en) | 2016-05-23 | 2016-05-23 | White-light LED constant current drive system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105813275A (en) |
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2016
- 2016-05-23 CN CN201610347480.8A patent/CN105813275A/en not_active Withdrawn
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Application publication date: 20160727 |
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| WW01 | Invention patent application withdrawn after publication |