CN207733023U - LED-TV high dynamic range regional dynamics backlight electric power regulating devices - Google Patents
LED-TV high dynamic range regional dynamics backlight electric power regulating devices Download PDFInfo
- Publication number
- CN207733023U CN207733023U CN201721828632.2U CN201721828632U CN207733023U CN 207733023 U CN207733023 U CN 207733023U CN 201721828632 U CN201721828632 U CN 201721828632U CN 207733023 U CN207733023 U CN 207733023U
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- Prior art keywords
- circuit
- led
- control device
- output
- drive control
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model discloses LED TV high dynamic range regional dynamics backlight electric power regulating devices, including：Power supply input circuit, pulse width modulator, drive control device, booster circuit and output protection circuit；The power supply input circuit is connect with externally fed power supply; the power supply input circuit connects drive control device with the output end of pulse width modulator; the output end of the input circuit connects booster circuit; the output end of the booster circuit is connect with LED light source, and the output end of the drive control device is connect by output protection circuit with LED light source.The utility model is by being adjusted LED TV backlight electric powers; realize that LED TV regional dynamics backlights are adjusted; drive control device controls the electric current output of LED light source according to the pulse width modulator of reception; to adjust the output brightness of LED light source; drive control device is detected and fed back to the voltage of output circuit simultaneously, and LED light source is protected.
Description
Technical field
The utility model is related to LED-TV backlight technologies fields, and in particular to be carried on the back to LED-TV high dynamic range regional dynamics
Photoelectric source regulating device.
Background technology
LED-TV is the LCD TV screen for using LED light as backlight material.One is formed with tri- LED pipes of R/G/B
Pixel, by controlling the light on and off of each pixel, to realize the display of image.
Utility model content
The technical problem to be solved by the utility model is to the deficiencies in for the above-mentioned prior art, disclose LED-TV
High dynamic range regional dynamics backlight electric power regulating device.
The technical solution adopted in the utility model is：
LED-TV high dynamic range regional dynamics backlight electric power regulating devices, including：Power supply input circuit, pulsewidth modulation
Device, drive control device, booster circuit and output protection circuit；The power supply input circuit is connect with externally fed power supply, described
Power supply input circuit connects drive control device with the output end of pulse width modulator, and the output end connection of the power supply input circuit rises
The output end of volt circuit, the booster circuit is connect with LED light source, and the output end of the drive control device passes through output protection electricity
Road is connect with LED light source.
Further, the LED light source uses three-color LED lamp bead, and the output protection circuit includes three groups of red, green, blue
Output protection circuit.
Further, the drive control device uses the triple channel peak-current mode pulse width modulation controlled of HV9982 models
The single switch converter of device driving.
Further, the booster circuit is by inductance, the first diode, the first triode, the first capacitance and first resistor
Composition, the wherein cathode output end of input circuit are connect by inductance with the anode of the first diode, first diode
The positive terminal of negative pole end and LED light source connects, and the anode of first diode is connect with the drain electrode of the first triode, and described the
The grid of one triode and the control output pin of drive control device connect, and the negative pole end of first diode passes through the first electricity
Hold and the connection of the chip select pin of first resistor and drive control device, the source electrode of first triode and the piece of drive control device select
Pin connects.
Further, the output protection circuit includes：Voltage detecting circuit and output control circuit, the voltage detecting
The second capacitance of the circuit right side, second resistance and 3rd resistor are constituted, and one end of the second resistance and the cathode of the first diode connect
It connects, the other end of the second resistance and the voltage sense pin of drive control device connect, and the other end of the second resistance connects
It is grounded after connecing 3rd resistor and the parallel circuit of the second capacitance；
The output controls：Second diode, the second triode and the 4th resistance, the cathode of second diode
It being connect with the cathode of the first diode, the anode of second diode is connect with the drain electrode of the second triode, and the described 2nd 3
The grid of pole pipe and the current detecting pin of drive control device connect, and the source electrode of second triode is connect by the 4th resistance
Ground.
The utility model has the following advantages compared with prior art：
The utility model is realized that LED-TV regional dynamics backlights are adjusted, is led to by the way that LED-TV backlight electric powers are adjusted
It crosses power supply input circuit and is connected as its offer working power with externally fed power supply, generated for LED light by pulse width modulator
The control signal in source, drive control device receive the control signal of pulse width modulator, and logical to the voltage of power supply input circuit transmission
It crosses booster circuit and is converted to the voltage used for LED light source, drive control device is according to the pulse width modulator of reception to LED light source
Electric current output controlled, to adjust the output brightness of LED light source, while the voltage of output circuit is detected and anti-
It feeds drive control device, LED light source is protected.
Description of the drawings
Fig. 1 be the utility model proposes LED-TV high dynamic range regional dynamics backlight electric power regulating device structure charts；
Fig. 2 be the utility model proposes LED-TV high dynamic range regional dynamics backlight electric power regulating device circuit diagrams.
Specific implementation mode
The utility model is described in detail in each embodiment shown in below in conjunction with the accompanying drawings, but it should explanation,
These embodiments are not limitation of the utility model, and those of ordinary skill in the art are according to work(made by these embodiments
Energy, method or the equivalent transformation in structure or replacement, belong within the scope of protection of the utility model.
Referring to Fig. 1 to Fig. 2, wherein Fig. 1 be the utility model proposes LED-TV high dynamic range regional dynamics backlight electricity
Source regulating device structure chart；Fig. 2 be the utility model proposes LED-TV high dynamic range regional dynamics backlight electric powers adjust dress
Circuits figure.
As shown in Figure 1 to Figure 2, LED-TV high dynamic range regional dynamics backlight electric power regulating device, including：Power input
Circuit, pulse width modulator, drive control device, booster circuit and output protection circuit；The power supply input circuit and externally fed
Power supply connects, and the power supply input circuit connects drive control device, the power supply input circuit with the output end of pulse width modulator
Output end connect booster circuit, the output end of the booster circuit connect with LED light source, the output end of the drive control device
It is connect with LED light source by output protection circuit.
In the utility model embodiment, by the way that LED-TV backlight electric powers are adjusted, the LED-TV regional dynamics back of the body is realized
Light is adjusted, and being connected as it by power supply input circuit and externally fed power supply provides working power, is generated by pulse width modulator
For the control signal of LED light source, drive control device receives the control signal of pulse width modulator, and is transmitted to power supply input circuit
Voltage the voltage used for LED light source is converted to by booster circuit, drive control device is according to the pulse width modulator of reception
The output of the electric current of LED light source is controlled, to adjust the output brightness of LED light source, while to the voltage of output circuit into
Row detects and feeds back to drive control device, is protected to LED light source.
The LED light source of the utility model uses three-color LED lamp bead, and the output protection circuit includes that three groups of red, green, blue is defeated
Go out to protect circuit.Three kinds of colors are controlled respectively, can show that different colors, every group of output are protected by the adjustment of color
The circuit structure of protection circuit is identical, and pulse width modulator generates the control signal to red, green blue three-color, and drive control device passes through
Three groups of output protection circuits can be carried out with adjustment of the control realization to color.
The drive control device of the utility model uses the triple channel peak-current mode pulse width modulation controlled of HV9982 models
The single switch converter of device driving.Circuit structure is simple, convenient to control three groups of output protection circuits,
In the utility model, booster circuit by inductance L1, the first diode D2, the first triode Q1, the first capacitance C6 and
First resistor R5 compositions, the wherein cathode output end of input circuit are connect by inductance L1 with the anode of the first diode D2, institute
The positive terminal of the negative pole end and LED light source of stating the first diode D2 connects, anode and the one or three pole of the first diode D2
The drain electrode of pipe Q1 connects, and the grid of the first triode Q1 and the control output pin of drive control device connect, and described first
The negative pole end of diode D2 is connected by the first capacitance C6 and the chip select pin of first resistor R5 and drive control device, and described first
The source electrode of triode Q1 and the chip select pin of drive control device connect.
Three groups of output protection circuits are identical circuit structure, by taking one of which output protection circuit as an example, output protection
Circuit includes：Voltage detecting circuit and output control circuit, the voltage detecting circuit right side the second capacitance C9, the second resistance R8 and
3rd resistor R9 is constituted, and one end of the second resistance R8 is connect with the cathode of the first diode D2, the second resistance R8's
The other end and the voltage sense pin of drive control device connect, the other end connection 3rd resistor R9 of the second resistance R8 and the
It is grounded after the parallel circuit of two capacitance C9；
The output controls：Second diode D3, the second triode Q4 and the 4th resistance R14, the two or two pole
The cathode of pipe D3 is connect with the cathode of the first diode D2, the drain electrode of the anode and the second triode Q2 of the second diode D3
Connection, the grid of the second triode Q2 and the current detecting pin of drive control device connect, the second triode Q2's
Source electrode passes through the 4th resistance R14 ground connection.
In the utility model embodiment, in booster circuit, the first triode is flowed through in the chip select pin detection of drive control device
The electric current of Q1, when the electric current for flowing through the first triode Q1 is more than certain value, constant current output is realized in the first triode Q1 shutdowns；
Second triode Q2 plays the role of output over-voltage protection and light modulation, the voltage sense pin of drive control device and the second triode
Q2 connections, when the voltage of this pin is more than 5V, the second triode Q2 shutdowns, while the timing inside drive control device HV9982
Device starts timing, after the completion of timing, detects the voltage on voltage sense pin again whether more than 5V, no more than the then the 2nd 3
Pole pipe Q2 conductings, continue to turn off, so repeat more than then the second triode Q2.When light modulation, when the pin of pulse width modulator is height
When level, the second triode Q2 conductings；When pulse width modulator pin is low level, the second triode Q2 shutdowns, by LED light source
It is disconnected from the circuit, prevents output capacitance from discharging by LED.Change the duty ratio of the dim signal of pulse width modulator, so that it may adjust
Save the brightness of LED.
The preferred embodiment for the present invention is explained in detail above, but the present invention is not limited to the above embodiment,
Those of ordinary skill in the art within the scope of knowledge, can also make various without departing from the purpose of the present invention
Variation.
Many other changes and remodeling can be made by not departing from the spirit and scope of the present invention.It should be appreciated that the present invention is not
It is limited to specific embodiment, the scope of the present invention is defined by the following claims.
Claims (5)
1.LED-TV high dynamic range regional dynamics backlight electric power regulating devices, which is characterized in that including：Power supply input circuit,
Pulse width modulator, drive control device, booster circuit and output protection circuit；The power supply input circuit connects with externally fed power supply
It connects, the power supply input circuit connects drive control device, the output of the power supply input circuit with the output end of pulse width modulator
End connection booster circuit, the output end of the booster circuit connect with LED light source, and the output end of the drive control device passes through defeated
Go out circuit is protected to connect with LED light source.
2. LED-TV high dynamic range regional dynamics backlight electric power regulating device according to claim 1, which is characterized in that
The LED light source uses three-color LED lamp bead, and the output protection circuit includes three groups of output protection circuits of red, green, blue.
3. LED-TV high dynamic range regional dynamics backlight electric power regulating device according to claim 1, which is characterized in that
The drive control device is turned using the single switch that the triple channel peak-current mode PDM keyer of HV9982 models drives
Parallel operation.
4. LED-TV high dynamic range regional dynamics backlight electric power regulating device according to claim 1, which is characterized in that
The booster circuit is made of inductance, the first diode, the first triode, the first capacitance and first resistor, wherein input circuit
Cathode output end connect by the anode of inductance and the first diode, the negative pole end of first diode and LED light source
Positive terminal connect, first diode anode connect with the drain electrode of the first triode, the grid of first triode and
The control output pin of drive control device connects, and the negative pole end of first diode passes through the first capacitance and first resistor and drive
The chip select pin of movement controller connects, and the source electrode of first triode and the chip select pin of drive control device connect.
5. LED-TV high dynamic range regional dynamics backlight electric power regulating device according to claim 1, which is characterized in that
The output protection circuit includes：Voltage detecting circuit and output control circuit, right second capacitance of the voltage detecting circuit, the
Two resistance and 3rd resistor are constituted, and one end of the second resistance is connect with the cathode of the first diode, the second resistance
The other end and the voltage sense pin of drive control device connect, other end connection 3rd resistor and the second electricity of the second resistance
It is grounded after the parallel circuit of appearance；The output controls：Second diode, the second triode and the 4th resistance, described second
The cathode of diode is connect with the cathode of the first diode, and the anode of second diode connects with the drain electrode of the second triode
It connects, the grid of second triode and the current detecting pin of drive control device connect, and the source electrode of second triode is logical
Cross the 4th resistance eutral grounding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721828632.2U CN207733023U (en) | 2017-12-22 | 2017-12-22 | LED-TV high dynamic range regional dynamics backlight electric power regulating devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721828632.2U CN207733023U (en) | 2017-12-22 | 2017-12-22 | LED-TV high dynamic range regional dynamics backlight electric power regulating devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207733023U true CN207733023U (en) | 2018-08-14 |
Family
ID=63086406
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721828632.2U Expired - Fee Related CN207733023U (en) | 2017-12-22 | 2017-12-22 | LED-TV high dynamic range regional dynamics backlight electric power regulating devices |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207733023U (en) |
-
2017
- 2017-12-22 CN CN201721828632.2U patent/CN207733023U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180814 Termination date: 20181222 |