CN104952397A - LED backlight drive circuit and LCD display - Google Patents
LED backlight drive circuit and LCD display Download PDFInfo
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- CN104952397A CN104952397A CN201410114901.3A CN201410114901A CN104952397A CN 104952397 A CN104952397 A CN 104952397A CN 201410114901 A CN201410114901 A CN 201410114901A CN 104952397 A CN104952397 A CN 104952397A
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Abstract
An embodiment of the invention discloses an LED backlight drive circuit and an LCD display. The circuit includes a drive circuit, a dimming circuit and a power source VC. The power source VC is connected to the drive circuit and the dimming circuit and is used for supplying power for the drive circuit and the dimming circuit. The dimming circuit is connected to the drive circuit and is used for inputting PWM dimming signals to the drive circuit. The drive circuit drives two LED branch circuits separately and can perform timely adjustment according to voltages fed back by the LED branches at the same time. By adopting the LED backlight drive circuit provided by the invention, two independent channels of drive can be provided, so that the quantities of LEDs of the different branch circuits can be different. The reliability of the LCD display is improved and LED service lifetime is prolonged.
Description
Technical field
The present invention relates to circuit engineering field, particularly relate to a kind of LED backlight drive circuit and LCD display.
Background technology
Cold-cathode fluorescence lamp CCFL is widely used as backlight in LCD display, CCFL backlight drive circuit is as the important component part of backlight control circuit, its complex circuit, make the serviceable life of cold-cathode fluorescence lamp CCFL short, and power consumption can not meet energy-conservation needs greatly.Along with the progress of LED light source and Driving technique, using the backlight of LED as LCD display.
For making uniform illumination, backlight many employings two paths of LED, but shares drivings, when a wherein road have postpone or disconnection time, the electric current on another road can increase instantaneously, affects LCD display serviceable life.
Summary of the invention
Embodiment of the present invention technical matters to be solved is, provides a kind of LED backlight drive circuit and LCD display, and can be each paths of LEDs provides and independently drive, and improves the serviceable life of LCD display.
In order to solve the problems of the technologies described above, embodiments provide a kind of LED backlight drive circuit, comprise driving circuit, light adjusting circuit and power supply VC;
Wherein, described driving circuit comprises control chip U1, electric capacity C6, electric capacity C7, inductance L 1, inductance L 2, resistance R6, resistance R7, electric capacity C4, electric capacity C5, a LED branch road and the 2nd LED branch road; The light modulation pin CTRL1 of described control chip U1 is all connected with the output terminal of described light adjusting circuit with light modulation pin CTRL2; One end of described electric capacity C6 is all connected with described power supply VC with one end of described electric capacity C7, the other end of described electric capacity C6 and the equal ground connection of the other end of described electric capacity C7; One end of described inductance L 1 is all connected with described power supply VC with one end of described inductance L 2, and the other end of described inductance L 1 is connected with the switched pins SW1 of described control chip U1; The other end of described inductance L 2 is connected with the switched pins SW2 of described control chip U1; The anode of a described LED branch road is connected with the output pin Vout1 of described control chip U1, the negative electrode of a described LED branch road is connected with one end of described resistance R6, the other end ground connection of described resistance R6, the output pin Vout1 of described control chip U1 is also connected rear ground connection with one end of described electric capacity C4; The anode of described 2nd LED branch road is connected with the output pin Vout2 of described control chip U1, and the negative electrode of described 2nd LED branch road is connected rear ground connection with described resistance R7, and the output pin Vout2 of described control chip U1 is also connected rear ground connection with described electric capacity C5;
A described LED branch road and described 2nd LED branch road in series by least one light emitting diode respectively.
Wherein, the feedback pin FB1 of control chip U1 described in described driving circuit is connected with the negative electrode of a described LED branch road; The feedback pin FB2 of described control chip U1 is connected with the negative electrode of described 2nd LED branch road.
Wherein, described light adjusting circuit comprises: microcontroller U2, resistance R1, resistance R2, electric capacity C1, stabilivolt ZD1, button K1 and communication interface CON1;
Wherein, one end of described resistance R1 is connected with described power supply VC, and the other end of described resistance R1 is connected with the power pins VCC of one end of described electric capacity C1, the negative electrode of described stabilivolt ZD1 and described microcontroller U2 respectively; The other end of described electric capacity C1 is all connected with one end of described button K1 with the anode of described stabilivolt ZD1; The other end of described button K1 is connected with one end of the I/O pin PB5 of described microcontroller U2 and described resistance R2; The other end of described resistance R2 is connected with described power supply VC;
The I/O pin PB1 of described microcontroller U2 is connected with the 2nd pin of described communication interface CON1, and the I/O pin PB2 of described microcontroller U2 is connected with the 1st pin of described communication interface CON1; The grounding pin GND ground connection of described microcontroller U2.
Wherein, also comprise: resistance R3, resistance R4, resistance R5, electric capacity C2, electric capacity C3;
Wherein, the light modulation pin CTRL1 of described control chip U1 is connected with one end of described resistance R3 and one end of described electric capacity C2 respectively; The light modulation pin CTRL2 of described control chip U1 is connected with one end of described resistance R5 and one end of described electric capacity C3 respectively; The frequency setting pin Rt of described control chip U1 is connected with one end of described resistance R4; The other end of described resistance R3 is connected with the I/O pin PB0 of described microcontroller U2; The other end of described resistance R5 is also connected with the IO output pin PB0 of described microcontroller U2; The other end ground connection of described resistance R4; The other end ground connection of described electric capacity C2; The other end ground connection of described electric capacity C3.
Wherein, described control chip U1 is switching power source chip.
Wherein, described microcontroller U2 is 8 single-chip microcomputers with pulse width modulation (PWM) function.
Wherein, described communication interface CON1 carries out serial communication for described microcontroller U2 and other processors.
Correspondingly, the embodiment of the present invention additionally provides LCD display, comprising: LCD display and LED backlight drive circuit,
Described LED backlight drive circuit is for controlling the backlight illumination of described LCD display, and wherein, described LED backlight drive circuit comprises driving circuit, light adjusting circuit and power supply VC; Described driving circuit comprises control chip U1, electric capacity C6, electric capacity C7, inductance L 1, inductance L 2, resistance R6, resistance R7, electric capacity C4, electric capacity C5, a LED branch road and the 2nd LED branch road; The light modulation pin CTRL1 of described control chip U1 is all connected with the output terminal of described light adjusting circuit with light modulation pin CTRL2; One end of described electric capacity C6 is all connected with described power supply VC with one end of described electric capacity C7, the other end of described electric capacity C6 and the equal ground connection of the other end of described electric capacity C7; One end of described inductance L 1 is all connected with described power supply VC with one end of described inductance L 2, and the other end of described inductance L 1 is connected with the switched pins SW1 of described control chip U1; The other end of described inductance L 2 is connected with the switched pins SW2 of described control chip U1; The anode of a described LED branch road is connected with the output pin Vout1 of described control chip U1, the negative electrode of a described LED branch road is connected with one end of described resistance R6, the other end ground connection of described resistance R6, the output pin Vout1 of described control chip U1 is also connected rear ground connection with one end of described electric capacity C4; The anode of described 2nd LED branch road is connected with the output pin Vout2 of described control chip U1, and the negative electrode of described 2nd LED branch road is connected rear ground connection with described resistance R7, and the output pin Vout2 of described control chip U1 is also connected rear ground connection with described electric capacity C5;
A described LED branch road and described 2nd LED branch road in series by least one light emitting diode respectively.
Wherein, the feedback pin FB1 of control chip U1 described in described driving circuit is connected with the negative electrode of a described LED branch road; The feedback pin FB2 of described control chip U1 is connected with the negative electrode of described 2nd LED branch road.
Wherein, described light adjusting circuit comprises: microcontroller U2, resistance R1, resistance R2, electric capacity C1, stabilivolt ZD1, button K1 and communication interface CON1;
Wherein, one end of described resistance R1 is connected with described power supply VC, and the other end of described resistance R1 is connected with the power pins VCC of one end of described electric capacity C1, the negative electrode of described stabilivolt ZD1 and described microcontroller U2 respectively; The other end of described electric capacity C1 is all connected with one end of described button K1 with the anode of described stabilivolt ZD1; The other end of described button K1 is connected with one end of the I/O pin PB5 of described microcontroller U2 and described resistance R2; The other end of described resistance R2 is connected with described power supply VC;
The I/O pin PB1 of described microcontroller U2 is connected with the 2nd pin of described communication interface CON1, and the I/O pin PB2 of described microcontroller U2 is connected with the 1st pin of described communication interface CON1; The grounding pin GND ground connection of described microcontroller U2.
Implement the embodiment of the present invention, there is following beneficial effect:
The embodiment of the present invention adopts LED as the backlight of LCD display, independently drive for a described LED branch road and described 2nd LED branch road provide, and the backlight illumination of a LED branch road and described 2nd LED branch road is controlled by light adjusting circuit, simplify conventional driving circuit design proposal, there is provided simultaneously and independently drive and can improve reliability, improve the serviceable life of LED.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The structural representation of a kind of LED backlight drive circuit that Fig. 1 provides for the embodiment of the present invention;
A kind of LED backlight drive circuit figure that Fig. 2 provides for the embodiment of the present invention;
The structural representation of a kind of LCD display that Fig. 3 provides for the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1, be the structural representation of a kind of LED backlight drive circuit that the embodiment of the present invention provides, described LED backlight drive circuit comprises driving circuit 1, light adjusting circuit 2 and power supply VC;
Wherein, described driving circuit 1 comprises control chip U1, electric capacity C6, electric capacity C7, inductance L 1, inductance L 2, resistance R6, resistance R7, electric capacity C4, electric capacity C5, a LED branch road 11 and the 2nd LED branch road 12; The light modulation pin CTRL1 of described control chip U1 is all connected with the output terminal of described light adjusting circuit 2 with light modulation pin CTRL2; One end of described electric capacity C6 is all connected with described power supply VC with one end of described electric capacity C7, the other end of described electric capacity C6 and the equal ground connection of the other end of described electric capacity C7; One end of described inductance L 1 is all connected with described power supply VC with one end of described inductance L 2, and the other end of described inductance L 1 is connected with the switched pins SW1 of described control chip U1; The other end of described inductance L 2 is connected with the switched pins SW2 of described control chip U1; The anode of a described LED branch road 11 is connected with the output pin Vout1 of described control chip U1, the negative electrode of a described LED branch road 11 is connected with one end of described resistance R6, the other end ground connection of described resistance R6, the output pin Vout1 of described control chip U1 is also connected rear ground connection with one end of described electric capacity C4; The anode of described 2nd LED branch road 12 is connected with the output pin Vout2 of described control chip U1, the negative electrode of described 2nd LED branch road 12 is connected rear ground connection with described resistance R7, the output pin Vout2 of described control chip U1 is also connected rear ground connection with described electric capacity C5;
A described LED branch road 11 and described 2nd LED branch road 12 in series by least one light emitting diode respectively, the LED quantity of a described LED branch road 11 and described 2nd LED branch road 12 can be different many.
The principle of work of LED backlight drive circuit described in the embodiment of the present invention is:
The voltage that described power supply VC provides flows into switched pins SW1 and the switched pins SW2 of described control chip U1 respectively through described inductance L 1 and described inductance L 2, drive a described LED branch road 11 and described 2nd LED branch road 12 respectively through the output pin Vout1 of described control chip U1 and output pin Vout2 again, described electric capacity C6 and described electric capacity C7 is used for voltage or current filtering to flowing into described control chip U1.The output voltage of a described LED branch road 11 and described 2nd LED branch road 12, available following formulae discovery:
Wherein, Vo is required output voltage, Vdc is the input voltage of power supply VC, Ro is the resistance value of a described LED branch road 11 or described 2nd LED branch road 12, LED specifications manual can be consulted obtain, TON is the dutycycle of the pwm signal received of described control chip U1 inside, L is the inductance value of described inductance L 6 or L7, K is the coefficient of setting, such as 0.8, because described driving circuit 1 connects a light adjusting circuit 2, namely each LED branch road is operated in identical frequency of operation, alternatively, in the embodiment of the present invention, described driving circuit can receive multiple pwm signal, even if described LED branch road is operated in different frequencies, here to regulate the inductance value of described inductance L 6 and described inductance L 7, regulate the output voltage of different LED branch road.
Implement the beneficial effect of the embodiment of the present invention:
The embodiment of the present invention adopts LED as the backlight of LCD display, independently drive for a described LED branch road 11 and described 2nd LED branch road 12 provide, and the backlight illumination of a LED branch road 11 and described 2nd LED branch road 12 is controlled by light adjusting circuit 2, simplify conventional driving circuit design proposal, there is provided independently to drive simultaneously and different output voltages can be provided, improve reliability, improve the serviceable life of LED.
Refer to Fig. 2, be a kind of LED backlight drive circuit figure that the embodiment of the present invention provides, described circuit diagram comprises driving circuit 1, light adjusting circuit 2 and power supply VC described in above-described embodiment,
In addition, the feedback pin FB1 of control chip U1 described in described driving circuit 1 is connected with described LED branch road 11 negative electrode; The feedback pin FB2 of described control chip U1 is connected with the negative electrode of described 2nd LED branch road, for making the current constant of driving circuit, specific works principle is: described resistance R6 and described resistance R7 detects the electric current of a described LED branch road 11 and described 2nd LED branch road 12 respectively, then compared by described control chip U1 feedback, if electric current is excessive or the duty cycle adjustment of the too small pwm signal by light adjusting circuit 2 output.
Wherein, described light adjusting circuit 2 comprises: microcontroller U2, resistance R1, resistance R2, electric capacity C1, stabilivolt ZD1, button K1 and communication interface CON1;
Wherein, one end of described resistance R1 is connected with described power supply VC, and the other end of described resistance R1 is connected with the power pins VCC of one end of described electric capacity C1, the negative electrode of described stabilivolt ZD1 and described microcontroller U2 respectively; The other end of described electric capacity C1 is all connected with one end of described button K1 with the anode of described stabilivolt ZD1; The other end of described button K1 is connected with one end of the I/O pin PB5 of described microcontroller U2 and described resistance R2; The other end of described resistance R2 is connected with described power supply VC;
The I/O pin PB1 of described microcontroller U2 is connected with the 2nd pin of described communication interface CON1, and the I/O pin PB2 of described microcontroller U2 is connected with the 1st pin of described communication interface CON1; The grounding pin GND ground connection of described microcontroller U2.
Concrete, described light adjusting circuit 2 for sending dim signal to described driving circuit 1, and can carry out communication by the processor in described communication interface CON1 and other circuit, or the program changing described microcontroller is to change dimming effect.
Wherein, described LED backlight drive circuit also comprises: resistance R3, resistance R4, resistance R5, electric capacity C2, electric capacity C3;
Wherein, the light modulation pin CTRL1 of described control chip U1 is connected with one end of described resistance R3 and one end of described electric capacity C2 respectively; The light modulation pin CTRL2 of described control chip U1 is connected with one end of described resistance R5 and one end of described electric capacity C3 respectively; The frequency setting pin Rt of described control chip U1 is connected with one end of described resistance R4; The other end of described resistance R3 is connected with the I/O pin PB0 of described microcontroller U2; The other end of described resistance R5 is also connected with the IO output pin PB0 of described microcontroller U2; The other end ground connection of described resistance R4; The other end ground connection of described electric capacity C2; The other end ground connection of described electric capacity C3.
Concrete, described button K1 is used for the reset of described microcontroller U2, and described resistance R1, described stabilivolt ZD1 and described electric capacity C1 are used for providing a low stable operating voltage to described microcontroller U2.
Optionally, the U1 of control chip described in the embodiment of the present invention is switching power source chip LT3466, and described microcontroller U2 is 8 single-chip microcomputers with pulse width modulation (PWM) function, as ATTINY13, by simple programming, at its output pin output pwm signal.
Implement the beneficial effect of the embodiment of the present invention:
The embodiment of the present invention provides two-way to drive by the control chip U1 in driving circuit 1, support the back lighting occasion that two paths of LED number does not wait, the output voltage of each LED branch road and input voltage, inductance, LED branch impedance value, described pwm signal dutycycle are relevant, by the size regulating the sensibility reciprocal of dutycycle or inductance to carry out regulation output voltage, simplify whole driving design scheme, reliability is provided, has saved the cost of conventional driving scheme.
Refer to Fig. 3, be the structural representation of a kind of LCD display that the embodiment of the present invention provides, described LCD display comprises LCD display 01 and LED backlight drive circuit 02,
Described LED backlight drive circuit 02 is for controlling the backlight illumination of described LCD display 01, and wherein, described LED backlight drive circuit 02 comprises driving circuit, light adjusting circuit and power supply VC; Described driving circuit comprises control chip U1, electric capacity C6, electric capacity C7, inductance L 1, inductance L 2, resistance R6, resistance R7, electric capacity C4, electric capacity C5, a LED branch road and the 2nd LED branch road; The light modulation pin CTRL1 of described control chip U1 is all connected with the output terminal of described light adjusting circuit with light modulation pin CTRL2; One end of described electric capacity C6 is all connected with described power supply VC with one end of described electric capacity C7, the other end of described electric capacity C6 and the equal ground connection of the other end of described electric capacity C7; One end of described inductance L 1 is all connected with described power supply VC with one end of described inductance L 2, and the other end of described inductance L 1 is connected with the switched pins SW1 of described control chip U1; The other end of described inductance L 2 is connected with the switched pins SW2 of described control chip U1; The anode of a described LED branch road is connected with the output pin Vout1 of described control chip U1, the negative electrode of a described LED branch road is connected with one end of described resistance R6, the other end ground connection of described resistance R6, the output pin Vout1 of described control chip U1 is also connected rear ground connection with one end of described electric capacity C4; The anode of described 2nd LED branch road is connected with the output pin Vout2 of described control chip U1, and the negative electrode of described 2nd LED branch road is connected rear ground connection with described resistance R7, and the output pin Vout2 of described control chip U1 is also connected rear ground connection with described electric capacity C5;
A described LED branch road and described 2nd LED branch road in series by least one light emitting diode respectively.
Wherein, the feedback pin FB1 of control chip U1 described in described driving circuit is connected with the negative electrode of a described LED branch road; The feedback pin FB2 of described control chip U1 is connected with the negative electrode of described 2nd LED branch road.
Wherein, described light adjusting circuit comprises: microcontroller U2, resistance R1, resistance R2, electric capacity C1, stabilivolt ZD1, button K1 and communication interface CON1;
Wherein, one end of described resistance R1 is connected with described power supply VC, and the other end of described resistance R1 is connected with the power pins VCC of one end of described electric capacity C1, the negative electrode of described stabilivolt ZD1 and described microcontroller U2 respectively; The other end of described electric capacity C1 is all connected with one end of described button K1 with the anode of described stabilivolt ZD1; The other end of described button K1 is connected with one end of the I/O pin PB5 of described microcontroller U2 and described resistance R2; The other end of described resistance R2 is connected with described power supply VC;
The I/O pin PB1 of described microcontroller U2 is connected with the 2nd pin of described communication interface CON1, and the I/O pin PB2 of described microcontroller U2 is connected with the 1st pin of described communication interface CON1; The grounding pin GND ground connection of described microcontroller U2.
Implement the beneficial effect of the embodiment of the present invention:
The embodiment of the present invention is by design two-way independently backlight drive circuit, any impact can not be had on another branch road when wherein a LED branch road disconnects, and the LED quantity of each branch road can be different, improve LED serviceable life, improve the reliability of LCD display.
One of ordinary skill in the art will appreciate that all or part of flow process realized in above-described embodiment method, that the hardware that can carry out instruction relevant by computer program has come, described program can be stored in a computer read/write memory medium, this program, when performing, can comprise the flow process of the embodiment as above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or random store-memory body (Random Access Memory, RAM) etc.
Above disclosedly be only present pre-ferred embodiments, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (10)
1. a LED backlight drive circuit, is characterized in that, comprises driving circuit, light adjusting circuit and power supply VC;
Wherein, described driving circuit comprises control chip U1, electric capacity C6, electric capacity C7, inductance L 1, inductance L 2, resistance R6, resistance R7, electric capacity C4, electric capacity C5, a LED branch road and the 2nd LED branch road; The light modulation pin CTRL1 of described control chip U1 is all connected with the output terminal of described light adjusting circuit with light modulation pin CTRL2; One end of described electric capacity C6 is all connected with described power supply VC with one end of described electric capacity C7, the other end of described electric capacity C6 and the equal ground connection of the other end of described electric capacity C7; One end of described inductance L 1 is all connected with described power supply VC with one end of described inductance L 2, and the other end of described inductance L 1 is connected with the switched pins SW1 of described control chip U1; The other end of described inductance L 2 is connected with the switched pins SW2 of described control chip U1; The anode of a described LED branch road is connected with the output pin Vout1 of described control chip U1, the negative electrode of a described LED branch road is connected with one end of described resistance R6, the other end ground connection of described resistance R6, the output pin Vout1 of described control chip U1 is also connected rear ground connection with one end of described electric capacity C4; The anode of described 2nd LED branch road is connected with the output pin Vout2 of described control chip U1, and the negative electrode of described 2nd LED branch road is connected rear ground connection with described resistance R7, and the output pin Vout2 of described control chip U1 is also connected rear ground connection with described electric capacity C5;
A described LED branch road and described 2nd LED branch road in series by least one light emitting diode respectively.
2. circuit as claimed in claim 1, it is characterized in that, the feedback pin FB1 of control chip U1 described in described driving circuit is connected with the negative electrode of a described LED branch road; The feedback pin FB2 of described control chip U1 is connected with the negative electrode of described 2nd LED branch road.
3. circuit as claimed in claim 1 or 2, it is characterized in that, described light adjusting circuit comprises: microcontroller U2, resistance R1, resistance R2, electric capacity C1, stabilivolt ZD1, button K1 and communication interface CON1;
Wherein, one end of described resistance R1 is connected with described power supply VC, and the other end of described resistance R1 is connected with the power pins VCC of one end of described electric capacity C1, the negative electrode of described stabilivolt ZD1 and described microcontroller U2 respectively; The other end of described electric capacity C1 is all connected with one end of described button K1 with the anode of described stabilivolt ZD1; The other end of described button K1 is connected with one end of the I/O pin PB5 of described microcontroller U2 and described resistance R2; The other end of described resistance R2 connects VC with described power supply and is connected;
The I/O pin PB1 of described microcontroller U2 is connected with the 2nd pin of described communication interface CON1, and the I/O pin PB2 of described microcontroller U2 is connected with the 1st pin of described communication interface CON1; The grounding pin GND ground connection of described microcontroller U2.
4. circuit as claimed in claim 3, is characterized in that, also comprise: resistance R3, resistance R4, resistance R5, electric capacity C2, electric capacity C3;
Wherein, the light modulation pin CTRL1 of described control chip U1 is connected with one end of described resistance R3 and one end of described electric capacity C2 respectively; The light modulation pin CTRL2 of described control chip U1 is connected with one end of described resistance R5 and one end of described electric capacity C3 respectively; The frequency setting pin Rt of described control chip U1 is connected with one end of described resistance R4; The other end of described resistance R3 is connected with the I/O pin PB0 of described microcontroller U2; The other end of described resistance R5 is also connected with the IO output pin PB0 of described microcontroller U2; The other end ground connection of described resistance R4; The other end ground connection of described electric capacity C2; The other end ground connection of described electric capacity C3.
5. circuit as claimed in claim 1, it is characterized in that, described control chip U1 is switching power source chip.
6. circuit as claimed in claim 1, it is characterized in that, described microcontroller U2 is 8 single-chip microcomputers with pulse width modulation (PWM) function.
7. circuit as claimed in claim 3, is characterized in that, described communication interface CON1 is used for described microcontroller U2 and other processors carry out serial communication.
8. a LCD display, is characterized in that, comprises LCD display and LED backlight drive circuit,
Described LED backlight drive circuit is for controlling the backlight illumination of described LCD display, and wherein, described LED backlight drive circuit comprises driving circuit, light adjusting circuit and power supply VC; Described driving circuit comprises control chip U1, electric capacity C6, electric capacity C7, inductance L 1, inductance L 2, resistance R6, resistance R7, electric capacity C4, electric capacity C5, a LED branch road and the 2nd LED branch road; The light modulation pin CTRL1 of described control chip U1 is all connected with the output terminal of described light adjusting circuit with light modulation pin CTRL2; One end of described electric capacity C6 is all connected with described power supply VC with one end of described electric capacity C7, the other end of described electric capacity C6 and the equal ground connection of the other end of described electric capacity C7; One end of described inductance L 1 is all connected with described power supply VC with one end of described inductance L 2, and the other end of described inductance L 1 is connected with the switched pins SW1 of described control chip U1; The other end of described inductance L 2 is connected with the switched pins SW2 of described control chip U1; The anode of a described LED branch road is connected with the output pin Vout1 of described control chip U1, the negative electrode of a described LED branch road is connected with one end of described resistance R6, the other end ground connection of described resistance R6, the output pin Vout1 of described control chip U1 is also connected rear ground connection with one end of described electric capacity C4; The anode of described 2nd LED branch road is connected with the output pin Vout2 of described control chip U1, and the negative electrode of described 2nd LED branch road is connected rear ground connection with described resistance R7, and the output pin Vout2 of described control chip U1 is also connected rear ground connection with described electric capacity C5;
A described LED branch road and described 2nd LED branch road in series by least one light emitting diode respectively.
9. LCD display as claimed in claim 8, it is characterized in that, the feedback pin FB1 of control chip U1 described in described driving circuit is connected with the negative electrode of a described LED branch road; The feedback pin FB2 of described control chip U1 is connected with the negative electrode of described 2nd LED branch road.
10. LCD display as claimed in claim 8 or 9, it is characterized in that, described light adjusting circuit comprises: microcontroller U2, resistance R1, resistance R2, electric capacity C1, stabilivolt ZD1, button K1 and communication interface CON1;
Wherein, one end of described resistance R1 is connected with described power supply VC, and the other end of described resistance R1 is connected with the power pins VCC of one end of described electric capacity C1, the negative electrode of described stabilivolt ZD1 and described microcontroller U2 respectively; The other end of described electric capacity C1 is all connected with one end of described button K1 with the anode of described stabilivolt ZD1; The other end of described button K1 is connected with one end of the I/O pin PB5 of described microcontroller U2 and described resistance R2; The other end of described resistance R2 is connected with described power supply VC;
The I/O pin PB1 of described microcontroller U2 is connected with the 2nd pin of described communication interface CON1, and the I/O pin PB2 of described microcontroller U2 is connected with the 1st pin of described communication interface CON1; The grounding pin GND ground connection of described microcontroller U2.
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| CN107426864A (en) * | 2017-07-05 | 2017-12-01 | 佛山杰致信息科技有限公司 | LED control circuit |
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| CN104952397B (en) | 2019-02-05 |
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