CN207039975U - A kind of backlight control circuit - Google Patents
A kind of backlight control circuit Download PDFInfo
- Publication number
- CN207039975U CN207039975U CN201720614767.2U CN201720614767U CN207039975U CN 207039975 U CN207039975 U CN 207039975U CN 201720614767 U CN201720614767 U CN 201720614767U CN 207039975 U CN207039975 U CN 207039975U
- Authority
- CN
- China
- Prior art keywords
- circuit
- integrated circuit
- electric capacity
- resistance
- backlight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
It the utility model is related to a kind of backlight control circuit, including photoinduction circuit and backlight power circuit, photoinduction circuit includes the first integrated circuit, first resistor, second resistance and the first electric capacity, the model LX1970 of first integrated circuit, backlight power circuit includes the second integrated circuit, second electric capacity, 3rd electric capacity, 4th electric capacity, 5th electric capacity, 3rd resistor, 4th resistance, 5th resistance, diode and inductance, the model BD9677G of second integrated circuit, in the backlight control circuit, pass through photoinduction circuit, can be according to the bright dark of surrounding, to realize that the switch to backlight is controlled, so as to improve the practicality of backlight control circuit；Moreover, in backlight power circuit, the model BD9677G of the second integrated circuit, it has heat protection function, so as to be protected to backlight power circuit, improves the reliability of backlight source circuit.
Description
Technical field
Backlight control circuit field is the utility model is related to, more particularly to a kind of backlight control circuit.
Background technology
All it is that backlight is directly connect by power circuit in existing backlight control circuit, to control the bright of backlight
Secretly, meanwhile, by system come the break-make of controlling power circuit, but when be operated in darkness occasion when, if not external
The light source in portion is sensed, and will now have impact on reading of the staff to parameter, reduces the practicality of circuit；Not only such as
This, in the power circuit of backlight control circuit, due to being worked long hours in backlight, will cause output current gradually to increase
Greatly, and because power circuit lacks good heat protection function, easily cause backlight control circuit that short circuit occurs, so as to reduce
The reliability of circuit.
Utility model content
The technical problems to be solved in the utility model is：For overcome the deficiencies in the prior art, there is provided a kind of backlight control
Circuit processed.
Technical scheme is used by the utility model solves its technical problem：A kind of backlight control circuit, including light
Sensor circuit and backlight power circuit, the photoinduction circuit electrically connect with backlight power circuit；
The photoinduction circuit includes the first integrated circuit, first resistor, second resistance and the first electric capacity, first collection
Into the model LX1970 of circuit, the external 5V DC voltage power supplies of first end of first integrated circuit, described first is integrated
The 8th end ground connection of circuit, the 4th end of first integrated circuit are described by the external 5V DC voltage power supplies of first resistor
4th end of the first integrated circuit is grounded by second resistance, and the 4th end of first integrated circuit is connect by the first electric capacity
Ground, the 4th end of first integrated circuit are connected with backlight power circuit；
The backlight power circuit includes the second integrated circuit, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electricity
Appearance, 3rd resistor, the 4th resistance, the 5th resistance, diode and inductance, the model BD9677G of second integrated circuit, institute
The external 5V DC voltage power supplies in the 8th end of the second integrated circuit are stated, the 8th end of second integrated circuit passes through the second electric capacity
Ground connection, the 6th end of second integrated circuit is connected with the 4th end of the first integrated circuit, and the of second integrated circuit
Seven ends are connected by the 3rd electric capacity with the first end of the second integrated circuit, the first end of second integrated circuit and diode
Negative electrode is connected, the plus earth of the diode, and the first end of second integrated circuit is made up of inductance and the 5th electric capacity
Series circuit ground connection, one end ground connection of the series circuit of the 4th resistance and the 5th resistance composition, the 4th resistance and
5th resistance composition series circuit the other end respectively with the 5th electric capacity and inductance connection, the 3rd of second integrated circuit the
The series circuit that end is made up of 3rd resistor and the 4th electric capacity is grounded, and the 4th end of second integrated circuit is respectively with the 4th
Resistance and the connection of the 5th resistance.
Preferably, the diode is voltage-regulator diode, the model RB056L-40 of the diode.
Preferably, the parameter of the 5th electric capacity is 47u/15V.
Preferably, the resistance of the 3rd resistor is 10k Ω, the capacitance of the 4th electric capacity is 6800pF.
Preferably, the inductance value of the inductance is 15uH.
Wherein, in photoinduction circuit, the model LX1970, LX1970 of the first integrated circuit are a kind of new technology light
Sensor with spectral response, the eyes of the mankind are simulated, this device is optimal monitoring device brilliance control ambient light
System on flat-panel monitor.When the brightness of environment is dark, the 4th end of the first integrated circuit will output control letter
Number, to control backlight power circuit to work, so as to realize lighting for backlight；When the brightness of environment is brighter,
4th end of the first integrated circuit will output control signal, to close backlight.
Wherein, in backlight power circuit, the 8th end input service power supply of the second integrated circuit, the second collection is then passed through
Exported into after voltage stabilizing inside circuit, then by the first end of the second integrated circuit, at the same by the 4th resistance and the 5th resistance come
Output voltage is sampled, then the 3rd end of the second integrated circuit is acquired to sampling voltage, it is achieved thereby that output
The stable output of voltage, realize the reliable of backlight and light；The model BD9677G of second integrated circuit, there is heat to protect for it
Protective function, so as to be protected to backlight power circuit, improve the reliability of backlight source circuit.
The beneficial effects of the utility model are,, can be according to surrounding by photoinduction circuit in the backlight control circuit
It is bright dark, to realize that the switch to backlight is controlled, so as to improve the practicality of backlight control circuit；Not only such as
This, in backlight power circuit, the model BD9677G of the second integrated circuit, it has heat protection function, so as to right
Backlight power circuit is protected, and improves the reliability of backlight source circuit.
Brief description of the drawings
The utility model is further illustrated with reference to the accompanying drawings and examples.
Fig. 1 is the circuit theory diagrams of backlight control circuit of the present utility model；
In figure：A. photoinduction circuit, B. backlight power circuits, the integrated circuits of U1. first, the integrated circuits of U2. second,
R1. first resistor, R2. second resistances, R3. 3rd resistors, the resistance of R4. the 4th, the resistance of R5. the 5th, the electric capacity of C1. first, C2.
Two electric capacity, the electric capacity of C3. the 3rd, the electric capacity of C4. the 4th, the electric capacity of C5. the 5th, VD1. diodes, L1. inductance.
Embodiment
The utility model is described in further detail presently in connection with accompanying drawing.These accompanying drawings are simplified schematic diagram,
Only illustrate basic structure of the present utility model in a schematic way, therefore it only shows the composition relevant with the utility model.
As shown in figure 1, a kind of backlight control circuit, including photoinduction circuit A and backlight power circuit B, the light
Sensor circuit A electrically connects with backlight power circuit B；
The photoinduction circuit A includes the first integrated circuit U1, first resistor R1, second resistance R2 and the first electric capacity C1,
The model LX1970, the first integrated circuit U1 of the first integrated circuit the U1 external 5V direct currents piezoelectricity of first end
Source, the 8th end ground connection of the first integrated circuit U1, the 4th end of the first integrated circuit U1 by first resistor R1 outside
5V DC voltage power supplies are connect, the 4th end of the first integrated circuit U1 is grounded by second resistance R2, the described first integrated electricity
Road U1 the 4th end is grounded by the first electric capacity C1, and the 4th end and the backlight power circuit B of the first integrated circuit U1 connect
Connect；
The backlight power circuit B includes the second integrated circuit U2, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity
C4, the 5th electric capacity C5,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, diode VD1 and inductance L1, described second is integrated
The model BD9677G of circuit U 2, the external 5V DC voltage power supplies in the 8th end of the second integrated circuit U2, second collection
It is grounded into the 8th end of circuit U 2 by the second electric capacity C2, the 6th end and the first integrated circuit U1 of the second integrated circuit U2
The connection of the 4th end, the first end that the 7th end of the second integrated circuit U2 passes through the 3rd electric capacity C3 and the second integrated circuit U2
Connection, the first end of the second integrated circuit U2 are connected with diode VD1 negative electrode, the plus earth of the diode VD1,
The series circuit that the first end of the second integrated circuit U2 is made up of inductance L1 and the 5th electric capacity C5 is grounded, the 4th electricity
Hinder one end ground connection of the series circuit of R4 and the 5th resistance R5 compositions, the series connection of the 4th resistance R4 and the 5th resistance the R5 composition
The other end of circuit is connected with the 5th electric capacity C5 and inductance L1 respectively, and the 3rd end of the second integrated circuit U2 passes through the 3rd electricity
Hinder the series circuit ground connection of R3 and the 4th electric capacity C4 compositions, the 4th end of the second integrated circuit U2 respectively with the 4th resistance R4
Connected with the 5th resistance R5.
Preferably, the diode VD1 is voltage-regulator diode, the model RB056L-40 of the diode VD1.
Preferably, the parameter of the 5th electric capacity C5 is 47u/15V.
Preferably, the capacitance that the resistance of the 3rd resistor R3 is 10k Ω, the 4th electric capacity C4 is 6800pF.
Preferably, the inductance L1 amounts of the inductance L1 are 15uH.
Wherein, in photoinduction circuit A, the first integrated circuit U1 model LX1970, LX1970 are a kind of new skills
Art light belt has the sensor of spectral response, simulates the eyes of the mankind, and this device is optimal monitoring device brilliance control ring
System on the light flat-panel monitor of border.When the brightness of environment is dark, the first integrated circuit U1 the 4th end will export
Control signal, to control backlight power circuit B to work, so as to realize lighting for backlight；When the brightness of environment is brighter
When, the first integrated circuit U1 the 4th end will output control signal, to close backlight.
Wherein, in backlight power circuit B, the second integrated circuit U2 the 8th end input service power supply, is then passed through
Inside two integrated circuit U2 after voltage stabilizing, then exported by the second integrated circuit U2 first end, at the same by the 4th resistance R4 and
5th resistance R5 is sampled to output voltage, and then the second integrated circuit U2 the 3rd end is acquired to sampling voltage,
It is achieved thereby that the stable output of output voltage, realizes the reliable of backlight and lights；Second integrated circuit U2 model
BD9677G, it has heat protection function, so as to be protected to backlight power circuit B, improves backlight source circuit
Reliability.
Compared with prior art, in the backlight control circuit, by photoinduction circuit A, can according to the bright dark of surrounding,
To realize that the switch to backlight is controlled, so as to improve the practicality of backlight control circuit；Moreover, in backlight
In source current circuit B, the second integrated circuit U2 model BD9677G, it has heat protection function, so as to backlight
Power circuit B is protected, and improves the reliability of backlight source circuit.
Using it is above-mentioned according to desirable embodiment of the present utility model as enlightenment, pass through above-mentioned description, related work people
Member can carry out various changes and amendments in the range of without departing from this item utility model technological thought completely.This item is real
The content being not limited to new technical scope on specification, it is necessary to which its technology is determined according to right
Property scope.
Claims (5)
- A kind of 1. backlight control circuit, it is characterised in that including photoinduction circuit and backlight power circuit, the photoinduction Circuit electrically connects with backlight power circuit；The photoinduction circuit includes the first integrated circuit, first resistor, second resistance and the first electric capacity, the described first integrated electricity The model LX1970 on road, the external 5V DC voltage power supplies of first end of first integrated circuit, first integrated circuit The 8th end ground connection, the 4th end of first integrated circuit is by the external 5V DC voltage power supplies of first resistor, described first 4th end of integrated circuit is grounded by second resistance, and the 4th end of first integrated circuit passes through the first capacity earth, institute The 4th end for stating the first integrated circuit is connected with backlight power circuit；The backlight power circuit includes the second integrated circuit, the second electric capacity, the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity, the Three resistance, the 4th resistance, the 5th resistance, diode and inductance, the model BD9677G of second integrated circuit, described The external 5V DC voltage power supplies in the 8th end of two integrated circuits, the 8th end of second integrated circuit are connect by the second electric capacity Ground, the 6th end of second integrated circuit are connected with the 4th end of the first integrated circuit, and the 7th of second integrated circuit the End is connected by the 3rd electric capacity with the first end of the second integrated circuit, the first end of second integrated circuit and the moon of diode Pole is connected, the plus earth of the diode, and the first end of second integrated circuit is made up of inductance and the 5th electric capacity Series circuit is grounded, one end ground connection of the series circuit of the 4th resistance and the 5th resistance composition, the 4th resistance and the Five resistance composition series circuit the other end respectively with the 5th electric capacity and inductance connection, the 3rd end of second integrated circuit The series circuit being made up of 3rd resistor and the 4th electric capacity is grounded, and the 4th end of second integrated circuit is electric with the 4th respectively Resistance connects with the 5th resistance.
- 2. backlight control circuit as claimed in claim 1, it is characterised in that the diode is voltage-regulator diode, described The model RB056L-40 of diode.
- 3. backlight control circuit as claimed in claim 1, it is characterised in that the parameter of the 5th electric capacity is 47u/15V.
- 4. backlight control circuit as claimed in claim 1, it is characterised in that the resistance of the 3rd resistor is 10k Ω, institute The capacitance for stating the 4th electric capacity is 6800pF.
- 5. backlight control circuit as claimed in claim 1, it is characterised in that the inductance value of the inductance is 15uH.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720614767.2U CN207039975U (en) | 2017-05-27 | 2017-05-27 | A kind of backlight control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720614767.2U CN207039975U (en) | 2017-05-27 | 2017-05-27 | A kind of backlight control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207039975U true CN207039975U (en) | 2018-02-23 |
Family
ID=61470244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720614767.2U Expired - Fee Related CN207039975U (en) | 2017-05-27 | 2017-05-27 | A kind of backlight control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207039975U (en) |
-
2017
- 2017-05-27 CN CN201720614767.2U patent/CN207039975U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104218539B (en) | The charging circuit and method that charge power supply can be prevented to be reversely connected | |
| CN207460546U (en) | A kind of solar LED (Light Emitting Diode) lamp of intelligent control | |
| CN205131078U (en) | Bias light circuit of vehicle audio and air conditioner display screen | |
| CN203490927U (en) | Environmental parameters self-adaptation display equipment brightness automatic control device | |
| CN207039975U (en) | A kind of backlight control circuit | |
| CN101965077B (en) | Protection circuit for light emitting diode light | |
| CN106413201A (en) | Constant-current power supply with various current outputs for LED lamps | |
| CN204925233U (en) | Intelligence current -voltage table | |
| CN202858788U (en) | Intelligent curtain opening and closing device | |
| CN206533114U (en) | Power supply overvoltage protection circuit and power supply | |
| CN206134210U (en) | LED display screen control circuit with environment self -adaptation adjustting of lighteness function | |
| CN205987464U (en) | Intelligence car light control circuit | |
| CN205232516U (en) | Intelligent lighting fixture and aerial detection equipment of anthropomorphic dummy eye light adaptation | |
| CN205622944U (en) | A induction type lamp control system for house | |
| CN204761767U (en) | LED's automatic control drive circuit | |
| CN209486240U (en) | A kind of LED open detection circuit | |
| CN201878385U (en) | Automatic dimming circuit of ecological house | |
| CN203522153U (en) | LED television backlight short circuit protection circuit and short circuit protector | |
| CN207283862U (en) | A kind of teaching simulation energy-saving control system for roam lamp | |
| CN206490882U (en) | The control circuit of controlling light illuminating apparatus | |
| CN208076593U (en) | A kind of Electronics and Information Engineering universal meter | |
| CN207529632U (en) | A kind of middle-size and small-size TFT-LCD functional simulations detection machine device | |
| CN110062506A (en) | A kind of sunlight simulating device and its driving method | |
| CN103716956A (en) | Lamp cap control system with automatic power-off capability | |
| CN205149641U (en) | A background light control circuit for commercial car combination meter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180223 Termination date: 20180527 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |