WO2018040420A1 - 背光驱动装置和电视机 - Google Patents

背光驱动装置和电视机 Download PDF

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Publication number
WO2018040420A1
WO2018040420A1 PCT/CN2016/112467 CN2016112467W WO2018040420A1 WO 2018040420 A1 WO2018040420 A1 WO 2018040420A1 CN 2016112467 W CN2016112467 W CN 2016112467W WO 2018040420 A1 WO2018040420 A1 WO 2018040420A1
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WIPO (PCT)
Prior art keywords
voltage
output
unit
signal
current
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PCT/CN2016/112467
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English (en)
French (fr)
Inventor
王坚
Original Assignee
深圳Tcl数字技术有限公司
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Application filed by 深圳Tcl数字技术有限公司 filed Critical 深圳Tcl数字技术有限公司
Publication of WO2018040420A1 publication Critical patent/WO2018040420A1/zh

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Classifications

    • 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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/63—Generation or supply of power specially adapted for television receivers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source

Definitions

  • the present invention relates to the field of television technology, and in particular, to a backlight driving device and a television set.
  • the existing backlight driving device is usually designed under the condition that the specification of the LED light bar has been clarified. For example, it is necessary to drive four LED strips.
  • the driving voltage/drive current required for each LED strip is 200V/0.15A.
  • the backlight driver designed according to this has four driving outputs, and the voltage of each driving output is / The current parameter is 200V/0.15A.
  • the existing backlight driving device has a defect of poor compatibility.
  • a primary object of the present invention is to provide a backlight driving device aimed at improving the compatibility of the backlight driving device.
  • the backlight driving device comprises an AC/DC converter, a control module and a driving branch; wherein the AC/DC converter is configured to convert AC power into DC power and provide the LED light bar;
  • the control module is configured to output a first PWM signal that adjusts a buck converter output current reference, and output a second PWM signal that adjusts the buck converter output voltage;
  • the driving branch includes: two interface modules And a buck converter, wherein one interface module is configured to convert the first PWM signal into a corresponding first voltage signal, and another interface module is configured to convert the second PWM signal into a corresponding second voltage signal,
  • the buck converter is configured to perform current and voltage control on the direct current output by the alternating current/direct current converter according to the first voltage signal and the second voltage signal to drive the LED light bar to work.
  • each of the interface modules includes a protection unit, a voltage following unit and a voltage output unit; an input end of the protection unit is connected to the control module, an output end of the protection unit and an input of the voltage following unit The terminal is connected, the output of the voltage follower unit is connected to the input of the voltage output unit, and the output of the voltage output unit is used for outputting a voltage signal.
  • control module includes a control chip and a peripheral circuit thereof, the control chip includes: a storage unit for storing a control program input by the computer; and a control unit configured to output a corresponding according to the control program stored by the storage unit The first PWM signal and the second PWM signal.
  • the buck converter of the driving branch is plural, and each of the buck converters is configured to output the AC/DC converter according to the first voltage signal and the second voltage signal, respectively.
  • the direct current is controlled by current and voltage to drive the respective corresponding LED strips to operate.
  • each of the interface modules includes a protection unit, a voltage following unit and a voltage output unit; an input end of the protection unit is connected to the control module, an output end of the protection unit and an input of the voltage following unit The terminal is connected, the output of the voltage follower unit is connected to the input of the voltage output unit, and the output of the voltage output unit is used for outputting a voltage signal.
  • control module is further configured to output a third PWM signal for adjusting brightness of the LED light bar;
  • driving branch further comprises: for converting the third PWM signal into a corresponding third voltage signal a further interface module, and a voltage/current converter for converting the third voltage signal into a corresponding current signal; the voltage/current converter for converting the third voltage signal into a corresponding current signal;
  • the buck converter is configured to perform current and voltage control on the direct current output by the alternating current/direct current converter according to the first voltage signal, the second voltage signal, and the current signal to drive the LED The light bar works.
  • each of the interface modules includes a protection unit, a voltage following unit and a voltage output unit; an input end of the protection unit is connected to the control module, an output end of the protection unit and an input of the voltage following unit The terminal is connected, the output of the voltage follower unit is connected to the input of the voltage output unit, and the output of the voltage output unit is used for outputting a voltage signal.
  • control module can output a corresponding third PWM signal according to the dimming signal input by the TV main board.
  • the buck converter of the driving branch is plural, and each of the buck converters is configured to perform the alternating current/direct current according to the first voltage signal, the second voltage signal and the current signal.
  • the direct current output from the converter performs current and voltage control to drive the LED strip to operate.
  • each of the interface modules includes a protection unit, a voltage following unit and a voltage output unit; an input end of the protection unit is connected to the control module, an output end of the protection unit and an input of the voltage following unit The terminal is connected, the output of the voltage follower unit is connected to the input of the voltage output unit, and the output of the voltage output unit is used for outputting a voltage signal.
  • the protection unit comprises a first capacitor; a first end of the first capacitor is an input end of the protection unit, and a second end of the first capacitor is an output end of the protection unit.
  • the voltage follower unit includes a first diode, a first transistor, a second transistor, a first resistor, a second resistor, a third resistor, and a fourth resistor; the first diode a cathode connected to a base of the first transistor, a connection node being an input end of the voltage follower unit; a collector of the first transistor, a second end of the first resistor, and The first end of the third resistor is interconnected, the first end of the first resistor and the first end of the second resistor are connected to a reference power source, the second end of the third resistor, the fourth resistor a first end and a base of the second transistor are interconnected, a collector of the second transistor is connected to a second end of the second resistor, and a connection node is the voltage follower unit An output; an anode of the first diode, an emitter of the first transistor, a second end of the fourth resistor, and an emitter of the second transistor are grounded.
  • the voltage output unit includes a second capacitor, a third capacitor, a fifth resistor, and a sixth resistor; a first end of the fifth resistor is an input end of the voltage output unit; and a fifth resistor The second end, the first end of the second capacitor and the first end of the sixth resistor are interconnected, and the second end of the sixth resistor is connected to the first end of the third capacitor, and the connection node thereof An output end of the voltage output unit; a second end of the second capacitor and a second end of the third capacitor are grounded.
  • the present invention also provides a television set comprising the backlight driving device as described above; wherein the backlight driving device comprises an AC/DC converter, a control module and a driving branch; wherein the AC/DC conversion And a control module for outputting a first PWM signal for adjusting a buck converter output current reference, and output adjusting the buck converter output a second PWM signal of the voltage;
  • the driving branch comprises: two interface modules and a buck converter, wherein one interface module is configured to convert the first PWM signal into a corresponding first voltage signal; another interface module And the buck converter is configured to output the AC/DC converter according to the first voltage signal and the second voltage signal
  • the direct current is controlled by current and voltage to drive the LED strip to operate.
  • control module includes a control chip and a peripheral circuit thereof, the control chip includes: a storage unit for storing a control program input by the computer; and a control unit configured to output a corresponding according to the control program stored by the storage unit The first PWM signal and the second PWM signal.
  • the buck converter of the driving branch is plural, and each of the buck converters is configured to output the AC/DC converter according to the first voltage signal and the second voltage signal, respectively.
  • the direct current is controlled by current and voltage to drive the respective corresponding LED strips to operate.
  • each of the interface modules includes a protection unit, a voltage following unit and a voltage output unit; an input end of the protection unit is connected to the control module, an output end of the protection unit and an input of the voltage following unit The terminal is connected, the output of the voltage follower unit is connected to the input of the voltage output unit, and the output of the voltage output unit is used for outputting a voltage signal.
  • control module is further configured to output a third PWM signal that adjusts brightness of the LED light bar;
  • driving branch further includes another circuit for converting the third PWM signal into a corresponding third voltage signal An interface module, and a voltage/current converter for converting the third voltage signal into a corresponding current signal; the buck converter for determining the first voltage signal, the second voltage signal, and The current signal performs current and voltage control on the direct current output by the AC/DC converter to drive the LED strip to operate.
  • the buck converter of the driving branch is plural, and each of the buck converters is configured to perform the alternating current/direct current according to the first voltage signal, the second voltage signal and the current signal.
  • the direct current output from the converter performs current and voltage control to drive the LED strip to operate.
  • each of the interface modules includes a protection unit, a voltage following unit and a voltage output unit; an input end of the protection unit is connected to the control module, an output end of the protection unit and an input of the voltage following unit The terminal is connected, the output of the voltage follower unit is connected to the input of the voltage output unit, and the output of the voltage output unit is used for outputting a voltage signal.
  • the technical solution of the present invention changes the reference current and the maximum driving voltage of the buck converter output in the driving branch by changing the control program in the control module, so that the backlight driving device proposed by the present invention can be customized according to the specification parameters of the LED strip to be driven. Adapt to adjust its output parameters to achieve the purpose of driving the LED light bar to work properly, and enhance compatibility.
  • FIG. 1 is a schematic diagram of functional modules of a first embodiment of a backlight driving device of the present invention
  • FIG. 2 is a schematic diagram of functional modules of a second embodiment of a backlight driving device of the present invention.
  • FIG. 3 is a schematic diagram of functional modules of a third embodiment of a backlight driving device of the present invention.
  • FIG. 4 is a schematic diagram of functional modules of a fourth embodiment of a backlight driving device according to the present invention.
  • FIG. 5 is a schematic diagram showing the circuit structure of the interface module shown in FIGS. 1 to 4.
  • first, second, and the like in the present invention are used for the purpose of description only, and are not to be construed as indicating or implying their relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” or “second” may include at least one of the features, either explicitly or implicitly.
  • the technical solutions between the various embodiments may be combined with each other, but must be based on the realization of those skilled in the art, and when the combination of the technical solutions is contradictory or impossible to implement, it should be considered that the combination of the technical solutions does not exist. It is also within the scope of protection required by the present invention.
  • the invention provides a backlight driving device which is suitable for use in an electronic device having an LED lamp, and is particularly suitable for use in a television set.
  • the backlight driving device of the present invention comprises an AC/DC converter 10, a control module 20 and a driving branch 30; wherein the AC/DC converter 10 is used to convert AC power into The DC power is supplied to the LED light bar; the control module 20 is configured to output a first PWM signal for adjusting the output current reference of the buck converter 50, and output a second PWM signal for adjusting the output voltage of the buck converter 50; the driving branch 30 includes Two interface modules 40 and a buck converter 50, wherein one interface module 40 is configured to convert the first PWM signal into a corresponding first voltage signal, and the other interface module 40 is configured to convert the second PWM signal into a corresponding first The two voltage signals, the buck converter 50 is configured to perform current and voltage control on the direct current output from the AC/DC converter 10 according to the first voltage signal and the second voltage signal to drive the operation of the LED strip.
  • the AC/DC converter 10 is used to convert AC power into The DC power is supplied to the LED light bar
  • the control module 20 is configured to output a first P
  • the control module 20 includes a control chip (not shown) and its peripheral circuit (not shown).
  • the control chip includes a storage unit (not shown) and a control unit (not shown). show).
  • the storage unit is configured to store a control program input by the computer; the control unit is configured to output the corresponding first PWM signal and the second PWM signal according to the control program stored by the storage unit, and need to change the first PWM signal and/or the second PWM signal
  • the duty cycle can be achieved by changing the control program stored in the memory unit. It is easily conceivable by those skilled in the art that the specific types of the control chip may be various, and the circuit structure of the peripheral circuit corresponding to the control chip may also be various, and no specific limitation is imposed herein.
  • the backlight driving device is connected to the commercial power, and the AC/DC converter 10 converts the commercial power into a stable direct current power, and then supplies the LED light bar to the isolation of the alternating current and the direct current.
  • the control module 20 outputs the first PWM signal and the second PWM signal to the driving branch 30, and one of the driving branches 30 converts the first PWM signal into a corresponding first voltage signal, and the other interface
  • the module 40 converts the second PWM signal into a corresponding second voltage signal; the buck converter 50 adjusts its output reference current according to the first voltage signal, and adjusts its maximum output voltage according to the second voltage signal.
  • the maximum driving voltage/reference current outputted by the backlight driving device at the time of shipment is 100V/0.15A.
  • the backlight driving device and the LED strip to be driven are directly assembled, and the LED strip to be driven can work normally.
  • the backlight driving device is assembled with the LED strip to be driven, so that the duty ratio of the first PWM signal is increased, so that the output of the buck converter 50 is output.
  • the reference current is 0.3A, and the LED strip to be driven can work normally.
  • the backlight driving device is assembled with the LED strip to be driven, and the LED strip to be driven can also work normally.
  • the duty ratio of the first PWM signal is reduced, so that the output of the buck converter 50 is output.
  • the reference current is 0.1A, and the LED strip to be driven can work normally.
  • the reference current outputted by the buck converter 50 is 0.1A, and the backlight driving device is assembled with the LED strip to be driven, and the LED strip to be driven can also work normally. .
  • the backlight driving device When the specification parameter of the LED strip to be driven is 200V/0.1A, after the backlight driving device is assembled with the LED strip to be driven, the duty ratio of the first PWM signal is decreased, and the second PWM signal is increased.
  • the duty ratio is such that the maximum driving voltage outputted by the buck converter 50 is greater than or equal to 200V, and the reference current is 0.1A, and the LED strip to be driven can operate normally.
  • the backlight driving device is When assembled with the LED strip to be driven, the LED strip can also work normally.
  • the backlight driving device is assembled with the LED strip to be driven, so that the duty ratio of the second PWM signal is increased, so that the output of the buck converter 50 is output.
  • the maximum driving voltage is greater than or equal to 200V, and the LED strip to be driven can work normally.
  • the backlight driving device is assembled with the LED strip to be driven, and the LED strip can be driven. normal work.
  • the backlight driving device and the LED strip to be driven are directly assembled, and the LED strip can work normally.
  • the duty ratio of the second PWM signal is reduced, so that the maximum driving voltage of the buck converter 50 is between 50V and 100V, and the LED strip can also be normal work.
  • the backlight driving device is assembled with the LED strip to be driven, and the LED strip to be driven is driven. It can also work normally.
  • the backlight driving device when assembling the backlight driving device and the LED strip to be driven, the backlight driving device is required to be detachably connected with the LED strip to be driven, and a current loop can be formed between the two.
  • the specific connection method is not limited here.
  • the backlight driving device proposed by the present invention can adaptively adjust the output parameters according to the specification parameters of the LED strip to be driven, so that the LED strip to be driven works normally and has strong compatibility.
  • the buck converter 50 of the driving branch 30 is plural, and each buck converter 50 is used for alternating current according to the first voltage signal and the second voltage signal.
  • the DC output from the DC converter 10 is controlled by current and voltage to drive the respective LED strips to operate.
  • the number of buck converters 50 in each of the driving branches 30 may be two, three, four, or even more, and is not limited herein. It should be noted that when the backlight driving device proposed by the present invention simultaneously outputs multiple identical maximum driving circuits/reference currents, the specification parameters of the LED strips corresponding to the respective buck converters 50 are not limited.
  • the number of buck converters 50 per drive branch 30 is four, and the maximum drive voltage/reference current output by each buck converter 50 is 200V/0.15A.
  • the specification parameters of the LED strip corresponding to each buck converter 50 may be 200V/0.15A, 180V/0.15A, 150V/0.15A and 180V/0.15A; or 110V/0.15A, 120V/0.15A. , 140V/0.15A and 150V/0.15A.
  • the specification parameters of the LED strips corresponding to the buck converters 50 may also be other combinations, which are not enumerated here.
  • the backlight driving device of the present invention further has a dimming function.
  • the control module 20 is further configured to output a third PWM signal for adjusting the brightness of the LED strip;
  • the circuit 30 further includes a further interface module 40 for converting the first PWM signal into a corresponding first voltage signal, and a voltage/current converter 60 for converting the third voltage signal into a corresponding current signal;
  • the 50 is configured to perform current and voltage control on the direct current output from the AC/DC converter 60 according to the first voltage signal, the second voltage signal, and the current signal to drive the LED strip to operate.
  • the control module 20 includes a control chip (not shown) and its peripheral circuit (not shown).
  • the control chip includes a storage unit (not shown) and a control unit (not shown). show).
  • the storage unit is configured to store a control program input by the computer; the control unit is configured to output a corresponding first PWM signal, a second PWM signal, and a corresponding dimming signal output corresponding to the input of the TV main board according to the control program stored in the storage unit.
  • the three PWM signals can be implemented by changing a control program of the computer input when the duty ratio of the first PWM signal and/or the second PWM signal needs to be changed, and can be changed when the duty ratio of the third PWM signal needs to be changed.
  • the dimming signal input by the TV main board is realized. It is easily conceivable by those skilled in the art that the specific types of the control chip may be various, and the circuit structure of the peripheral circuit corresponding to the control chip may also be various, and no specific limitation is imposed herein.
  • the voltage/current converter 60 may be a resistance module, and the voltage/current converter 60 is preferably a conversion resistor RT for the sake of simplifying circuit configuration.
  • the backlight driving device After the backlight driving device is assembled with the LED light bar to be driven, the backlight driving device is connected to the commercial power, and the AC/DC converter 10 converts the commercial power into a stable direct current, and then supplies the LED light bar to the alternating current and the direct current. Isolation.
  • the control module 20 outputs the first PWM signal, the second PWM signal and the third PWM signal to the driving branch 30, and one of the driving branches 30 converts the first PWM signal into a corresponding first voltage.
  • a signal, another interface module 40 converts the second PWM signal into a corresponding second voltage signal, and another interface module 40 converts the third PWM signal into a corresponding third voltage signal;
  • the voltage/current converter 60 converts the third voltage
  • the signal is converted to a corresponding current signal.
  • the buck converter 50 adjusts its output reference current according to the first voltage signal, adjusts its maximum output voltage according to the second voltage signal, and adjusts its output current according to the current signal.
  • the duty ratio of the third PWM signal outputted by the control module 20 can be changed by changing the dimming signal outputted by the main board, thereby changing the output current of the backlight driving device to adjust the LED strip.
  • the purpose of brightness is required to adjust the brightness of the LED strip.
  • the buck converter 50 of the driving branch 30 is plural, and each buck converter 50 is configured to be based on the first voltage signal, the second voltage signal, and the current signal pair.
  • the DC output from the AC/DC converter 10 is controlled by current and voltage to drive the LED strip to operate.
  • the number of buck converters 50 in each of the driving branches 30 may be two, three, four, or even more, and is not limited herein. It should be noted that when the backlight driving device proposed by the present invention simultaneously outputs multiple identical maximum driving circuits/reference currents, the specification parameters of the LED strips corresponding to the respective buck converters 50 are not limited.
  • the number of buck converters 50 per drive branch 30 is four, and the maximum drive voltage/drive current output by each buck converter 50 is 200V/0.15A.
  • the specification parameters of the LED strip corresponding to each buck converter 50 may be 120V/0.15A, 120V/0.15A, 150V/0.15A and 120V/0.15A; or 130V/0.15A, 140V/0.15A. , 150V/0.15A and 160V/0.15A.
  • the specification parameters of the LED strips corresponding to the buck converters 50 may also be other combinations, which are not enumerated here.
  • each interface module 40 includes a protection unit 100, a voltage following unit 200, and a voltage output unit 300.
  • the input end of the protection unit 100 is connected to the control module 20, and the protection unit 100
  • the output terminal is connected to the input terminal of the voltage follower unit 200, the output terminal of the voltage follower unit 200 is connected to the input terminal of the voltage output unit 300, and the output terminal of the voltage output unit 300 is used for outputting a voltage signal.
  • the interface module 40 receives the normal PWM signal, and the protection unit 10 and the voltage following unit 20 output the same PWM signal as the input PWM signal waveform, and the voltage output unit 30:
  • the input PWM signal is subjected to integral filtering processing to output a voltage signal having a magnitude corresponding to the duty ratio of the input PWM signal.
  • the interface module 40 receives a continuous low level signal or a continuous high level signal, and the output voltages of the protection unit 100, the voltage following unit 200, and the voltage output unit 300 are all zero. The circuit is protected.
  • the protection unit 100 includes a first capacitor C1; the first end of the first capacitor C1 is an input end of the protection unit 100, and the second end of the first capacitor C1 is a protection unit. The output of 100.
  • the protection unit 100 implements a protection function for the circuit.
  • the voltage follower unit 200 includes a first diode D1, a first transistor Q1, a second transistor Q2, a first resistor R1, and a second resistor R2. a third resistor R3 and a fourth resistor R41; a cathode of the first diode D1 is connected to a base of the first transistor Q1, and a connection node is an input end of the voltage follower unit 200; a set of the first transistor Q1
  • the electrode, the second end of the first resistor R1 and the first end of the third resistor R3 are interconnected, the first end of the first resistor R1 and the first end of the second resistor R2 are connected to the reference power source VREF, and the third resistor R3
  • the second end, the first end of the fourth resistor R4 and the base of the second transistor Q2 are interconnected, and the collector of the second transistor Q2 is connected to the second end of the second resistor R2, and the connection node is a voltage The output of the following unit 200;
  • the first transistor Q1 and the second transistor Q2 are both NPN type transistors.
  • the voltage follower unit 200 When the voltage follower unit 200 inputs a high level signal, the first transistor Q1 is turned on, and the collector voltage of the first transistor Q1 is pulled low. The base voltage of the second transistor Q2 is pulled low, the second transistor Q2 is turned off, the collector voltage of the second transistor Q2 is pulled high, and the voltage follower unit 200 outputs a high level signal.
  • the voltage follower unit 200 inputs a low level signal, the first transistor Q1 is turned off, and the collector voltage of the first transistor Q1 is pulled high. The base voltage of the second transistor Q2 is pulled high, the second transistor Q2 is turned on, the collector voltage of the second transistor Q2 is pulled low, and the voltage follower unit 200 outputs a low level signal.
  • the voltage output unit 300 includes a second capacitor C2, a third capacitor C3, a fifth resistor R5, and a sixth resistor R6.
  • the first end of the fifth resistor R5 is a voltage output.
  • the input end of the unit 300; the second end of the fifth resistor R5, the first end of the second capacitor C2, and the first end of the sixth resistor R6 are interconnected, and the second end of the sixth resistor R6 and the third capacitor C3 One end is connected, and the connection node is the output end of the voltage output unit 300; the second end of the second capacitor C2 and the second end of the third capacitor C3 are grounded to GND.
  • the second capacitor C2 and the fifth resistor R5 constitute a charge and discharge circuit
  • the third capacitor C3 and the sixth resistor R6 constitute a filter circuit
  • the second capacitor C2 When the electrical signal input to the voltage output unit 300 is at a high level, the second capacitor C2 is charged through the fifth resistor R5; when the electrical signal input to the voltage output unit 300 is at a low level, the second capacitor C2 passes through the fifth resistor R5. Discharge. It can be understood that the greater the duty ratio of the PWM signal input to the voltage output unit 300, the longer the charging time of the second capacitor C2 is, the larger the voltage output by the voltage output unit 300 is; in other words, the voltage output by the voltage output unit 300 The smaller.
  • the backlight driver is assembled with the LED strip to be driven.
  • the backlight driving device is connected to the commercial power, and the AC/DC converter 10 converts the commercial power voltage into a stable direct current power, and then supplies the LED light bar to the isolation of the alternating current and the direct current.
  • a control program is input to the control module 20 through the computer, so that the control module 20 outputs the first PWM signal, the second PWM signal and the third PWM signal of the appropriate duty ratio.
  • the interface module 40 in the driving branch 30 outputs a first voltage signal, a second voltage signal and a third voltage signal corresponding to the duty ratio of each PWM signal; voltage/current conversion
  • the controller 60 outputs a current signal having a magnitude corresponding to the amplitude of the third voltage signal; the at least one buck converter 50 adjusts the reference current of the output according to the first voltage signal, and adjusts the maximum driving voltage of the output according to the second voltage signal, according to the current The signal regulates its output current. If the control program in the control module 20 operates abnormally, each of the buck converters 50 does not output.
  • the output current of the buck converter 50 can be changed by changing the dimming signal outputted by the main board of the television.
  • the control program of the control module 20 can be changed by the computer to make the output parameter of the backlight driving device and the current LED light.
  • the specifications of the strips match and are very simple.
  • the present invention also provides a television set comprising the backlight driving device as described above.
  • the specific structure of the backlight driving device refers to the above embodiment, and since the television set adopts all the technical solutions of all the above embodiments, at least All the beneficial effects brought about by the technical solutions of the above embodiments are not described herein again.

Abstract

一种背光驱动装置和电视机；背光驱动装置包括交流/直流转换器、控制模块及驱动支路；其中，交流/直流转换器用于将交流电转换成直流电并提供给LED灯条；控制模块用于输出调节降压变换器输出电流基准的第一PWM信号，以及输出调节降压变换器输出电压的第二PWM信号；驱动支路包括两个接口模块及降压变换器，其中一个接口模块用于将第一PWM信号转换成对应的第一电压信号；另一个接口模块用于将第二PWM信号转换成对应的第二电压信号；降压变换器用于根据第一电压信号和第二电压信号对交流/直流变换器输出的直流电进行电流和电压控制，以驱动LED灯条工作。具有可靠性高的特点。

Description

背光驱动装置和电视机
技术领域
本发明涉及电视机技术领域，特别涉及一种背光驱动装置和电视机。
背景技术
现有的背光驱动装置，通常是在已经明确LED灯条规格参数的条件下进行设计的。比如，需要驱动四路LED灯条，每一路LED灯条所需的驱动电压/驱动电流为200V/0.15A，则据此设计的背光驱动装置具有四路驱动输出，每一路驱动输出的电压/电流参数是200V/0.15A。
若更换驱动电压/驱动电流为100V/0.3A的LED灯条，则此前设计的背光驱动装置不再适用，需要根据LED灯条的规格参数重新设计背光驱动装置。因此，现有的背光驱动装置存在兼容性差的缺陷。
发明内容
本发明的主要目的是提供一种背光驱动装置，旨在提高该背光驱动装置的兼容性。
为实现上述目的，本发明提出的背光驱动装置包括交流/直流转换器、控制模块及驱动支路；其中，所述交流/直流转换器，用于将交流电转换成直流电并提供给LED灯条；所述控制模块，用于输出调节降压变换器输出电流基准的第一PWM信号，以及输出调节所述降压变换器输出电压的第二PWM信号；所述驱动支路包括：两个接口模块及降压变换器，其中一个接口模块用于将所述第一PWM信号转换成对应的第一电压信号，另一个接口模块用于将所述第二PWM信号转换成对应的第二电压信号，所述降压变换器，用于根据所述第一电压信号和所述第二电压信号对所述交流/直流变换器输出的直流电进行电流和电压控制，以驱动所述LED灯条工作。
优选地，每一所述接口模块包括保护单元、电压跟随单元及电压输出单元；所述保护单元的输入端与所述控制模块连接，所述保护单元的输出端与所述电压跟随单元的输入端连接，所述电压跟随单元的输出端与所述电压输出单元的输入端连接，所述电压输出单元的输出端用于输出电压信号。
优选地，所述控制模块包括控制芯片及其外围电路，所述控制芯片包括：存储单元，用于存储计算机输入的控制程序；控制单元，用于根据所述存储单元所存储的控制程序输出对应的第一PWM信号和第二PWM信号。
优选地，所述驱动支路的降压变换器为多个，各所述降压变换器分别用于根据所述第一电压信号和所述第二电压信号对所述交流/直流变换器输出的直流电进行电流和电压控制，以驱动各自对应的所述LED灯条工作。
优选地，每一所述接口模块包括保护单元、电压跟随单元及电压输出单元；所述保护单元的输入端与所述控制模块连接，所述保护单元的输出端与所述电压跟随单元的输入端连接，所述电压跟随单元的输出端与所述电压输出单元的输入端连接，所述电压输出单元的输出端用于输出电压信号。
优选地，所述控制模块，还用于输出调节所述LED灯条亮度的第三PWM信号；所述驱动支路还包括用于将所述第三PWM信号转换成对应的第三电压信号的又一个接口模块、以及将所述第三电压信号转换成对应的电流信号的电压/电流转换器；所述电压/电流转换器，用于将所述第三电压信号转换成对应的电流信号；所述降压变换器，用于根据所述第一电压信号、所述第二电压信号和所述电流信号对所述交流/直流变换器输出的直流电进行电流和电压控制，以驱动所述LED灯条工作。
优选地，每一所述接口模块包括保护单元、电压跟随单元及电压输出单元；所述保护单元的输入端与所述控制模块连接，所述保护单元的输出端与所述电压跟随单元的输入端连接，所述电压跟随单元的输出端与所述电压输出单元的输入端连接，所述电压输出单元的输出端用于输出电压信号。
优选地，所述控制模块可根据电视机主板输入的调光信号输出对应的第三PWM信号。
优选地，所述驱动支路的降压变换器为多个，各所述降压变换器用于根据所述第一电压信号、所述第二电压信号和所述电流信号对所述交流/直流变换器输出的直流电进行电流和电压控制，以驱动所述LED灯条工作。
优选地，每一所述接口模块包括保护单元、电压跟随单元及电压输出单元；所述保护单元的输入端与所述控制模块连接，所述保护单元的输出端与所述电压跟随单元的输入端连接，所述电压跟随单元的输出端与所述电压输出单元的输入端连接，所述电压输出单元的输出端用于输出电压信号。
优选地，所述保护单元包括第一电容；所述第一电容的第一端为所述保护单元的输入端，所述第一电容的第二端为所述保护单元的输出端。
优选地，所述电压跟随单元包括第一二极管、第一三极管、第二三极管、第一电阻、第二电阻、第三电阻及第四电阻；所述第一二极管的阴极与所述第一三极管的基极连接，其连接节点为所述电压跟随单元的输入端；所述第一三极管的集电极、所述第一电阻的第二端及所述第三电阻的第一端互连，所述第一电阻的第一端及所述第二电阻的第一端与参考电源连接，所述第三电阻的第二端、所述第四电阻的第一端及所述第二三极管的基极互连，所述第二三极管的集电极与所述第二电阻的第二端连接，其连接节点为所述电压跟随单元的输出端；所述第一二极管的阳极、所述第一三极管的发射极、所述第四电阻的第二端及所述第二三极管的发射极接地。
优选地，所述电压输出单元包括第二电容、第三电容、第五电阻及第六电阻；所述第五电阻的第一端为所述电压输出单元的输入端；所述第五电阻的第二端、所述第二电容的第一端及所述第六电阻的第一端互连，所述第六电阻的第二端与所述第三电容的第一端连接，其连接节点为所述电压输出单元的输出端；所述第二电容的第二端及所述第三电容的第二端接地。
本发明还提出一种电视机，该电视机包括如上所述的背光驱动装置；其中，所述背光驱动装置包括交流/直流转换器、控制模块及驱动支路；其中，所述交流/直流转换器，用于将交流电转换成直流电并提供给LED灯条；所述控制模块，用于输出调节所述降压变换器输出电流基准的第一PWM信号，以及输出调节所述降压变换器输出电压的第二PWM信号；所述驱动支路包括：两个接口模块及降压变换器，其中一个接口模块用于将所述第一PWM信号转换成对应的第一电压信号；另一个接口模块用于将所述第二PWM信号转换成对应的第二电压信号；所述降压变换器，用于根据所述第一电压信号和所述第二电压信号对所述交流/直流变换器输出的直流电进行电流和电压控制，以驱动所述LED灯条工作。
优选地，所述控制模块包括控制芯片及其外围电路，所述控制芯片包括：存储单元，用于存储计算机输入的控制程序；控制单元，用于根据所述存储单元所存储的控制程序输出对应的第一PWM信号和第二PWM信号。
优选地，所述驱动支路的降压变换器为多个，各所述降压变换器分别用于根据所述第一电压信号和所述第二电压信号对所述交流/直流变换器输出的直流电进行电流和电压控制，以驱动各自对应的所述LED灯条工作。
优选地，每一所述接口模块包括保护单元、电压跟随单元及电压输出单元；所述保护单元的输入端与所述控制模块连接，所述保护单元的输出端与所述电压跟随单元的输入端连接，所述电压跟随单元的输出端与所述电压输出单元的输入端连接，所述电压输出单元的输出端用于输出电压信号。
优选地，所述控制模块还用于输出调节所述LED灯条亮度的第三PWM信号；所述驱动支路还包括用于将所述第三PWM信号转换成对应的第三电压信号的又一个接口模块、以及将所述第三电压信号转换成对应的电流信号的电压/电流转换器；所述降压变换器，用于根据所述第一电压信号、所述第二电压信号和所述电流信号对所述交流/直流变换器输出的直流电进行电流和电压控制，以驱动所述LED灯条工作。
优选地，所述驱动支路的降压变换器为多个，各所述降压变换器用于根据所述第一电压信号、所述第二电压信号和所述电流信号对所述交流/直流变换器输出的直流电进行电流和电压控制，以驱动所述LED灯条工作。
优选地，每一所述接口模块包括保护单元、电压跟随单元及电压输出单元；所述保护单元的输入端与所述控制模块连接，所述保护单元的输出端与所述电压跟随单元的输入端连接，所述电压跟随单元的输出端与所述电压输出单元的输入端连接，所述电压输出单元的输出端用于输出电压信号。
本发明技术方案通过改变控制模块中的控制程序来改变驱动支路中降压变换器输出的基准电流和最大驱动电压，使得本发明提出的背光驱动装置能够根据待驱动LED灯条的规格参数自适应调节其输出参数，达到驱动LED灯条正常工作的目的，增强兼容性。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图示出的结构获得其他的附图。
图1为本发明背光驱动装置第一实施例的功能模块示意图；
图2为本发明背光驱动装置第二实施例的功能模块示意图；
图3为本发明背光驱动装置第三实施例的功能模块示意图；
图4为本发明背光驱动装置第四实施例的功能模块示意图；
图5为图1至图4中所示接口模块的电路结构示意图。
附图标号说明：
标号 名称 标号 名称
10 直流/交流转换器 C1 第一电容
20 控制模块 C2 第二电容
30 驱动支路 C3 第三电容
40 接口模块 R1 第一电阻
50 降压变换器 R2 第二电阻
60 电压/电流转换器 R3 第三电阻
100 保护单元 R4 第四电阻
200 电压跟随单元 R5 第五电阻
300 电压输出单元 R6 第六电阻
Q1 第一三极管 RT 转换电阻
Q2 第二三极管 D1 第一二极管
本发明目的的实现、功能特点及优点将结合实施例，参照附图做进一步说明。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明的一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
需要说明，若本发明实施例中所有方向性指示（诸如上、下、左、右、前、后……），则仅用于解释在某一特定姿态（如附图所示）下各部件之间的相对位置关系、运动情况等，如果该特定姿态发生改变，则该方向性指示也相应地随之改变。
另外，在本发明中涉及“第一”、“第二”等的描述仅用于描述目的，而不能理解为指示或暗示其相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。另外，各个实施例之间的技术方案可以相互结合，但是必须是以本领域普通技术人员能够实现为基础，当技术方案的结合出现相互矛盾或无法实现时应当认为这种技术方案的结合不存在，也不在本发明要求的保护范围之内。
本发明提出一种背光驱动装置，该背光驱动装置适用于具有LED灯的电子设备中，尤其适用于电视机中。
如图1所示，在一实施例中，本发明提出的背光驱动装置包括交流/直流转换器10、控制模块20及驱动支路30；其中，交流/直流转换器10用于将交流电转换成直流电并提供给LED灯条；控制模块20用于输出调节降压变换器50输出电流基准的第一PWM信号，以及输出调节降压变换器50输出电压的第二PWM信号；驱动支路30包括两个接口模块40及降压变换器50，其中一个接口模块40用于将第一PWM信号转换成对应的第一电压信号，另一个接口模块40用于将第二PWM信号转换成对应的第二电压信号，降压变换器50用于根据第一电压信号和第二电压信号对交流/直流变换器10输出的直流电进行电流和电压控制，以驱动LED灯条工作。
需要说明的是，本实施例中，控制模块20包括控制芯片（图未示出）及其外围电路（图未示出），控制芯片包括存储单元（图未示出）及控制单元（图未示出）。存储单元用于存储计算机输入的控制程序；控制单元用于根据存储单元所存储的控制程序输出对应的第一PWM信号和第二PWM信号，在需要改变第一PWM信号和/或第二PWM信号的占空比时，可以通过改变存储单元中存储的控制程序实现。本领域技术人员容易想到的是，上述控制芯片的具体型号可以有多种，与控制芯片相应的外围电路的电路结构也有多种，此处均不做具体限制。
将背光驱动装置接入市电，交流/直流转换器10将市电转换成稳定的直流电后提供给LED灯条，并实现交流电与直流电的隔离。与此同时，控制模块20输出第一PWM信号及第二PWM信号至驱动支路30，驱动支路30中的一个接口模块40将第一PWM信号转换成对应的第一电压信号，另一个接口模块40将第二PWM信号转换成对应的第二电压信号；降压变换器50根据第一电压信号调节其输出的基准电流，根据第二电压信号调节其最大输出电压。
本实施例中，假设背光驱动装置出厂时输出的最大驱动电压/基准电流为100V/0.15A。
当待驱动LED灯条的规格参数为100V/0.15A时，直接将背光驱动装置与待驱动LED灯条组装在一起，待驱动LED灯条可以正常工作。
当待驱动LED灯条的规格参数为100V/0.3A时，在将背光驱动装置与待驱动LED灯条组装在一起后，增大第一PWM信号的占空比，使降压变换器50输出的基准电流为0.3A，待驱动LED灯条可以正常工作。在增大第一PWM信号占空比，使降压变换器50输出的基准电流为0.3A后，将背光驱动装置与待驱动LED灯条组装在一起，待驱动LED灯条也可以正常工作。
当待驱动LED灯条的规格参数为100V/0.1A时，在将背光驱动装置与待驱动LED灯条组装在一起后，减小第一PWM信号占空比，使降压变换器50输出的基准电流为0.1A，待驱动LED灯条可以正常工作。在减小第一PWM信号的占空比，使降压变换器50输出的基准电流为0.1A后，将背光驱动装置与待驱动LED灯条组装在一起，待驱动LED灯条也可以正常工作。
当待驱动LED灯条的规格参数为200V/0.1A时，在将背光驱动装置与待驱动LED灯条组装在一起后，减小第一PWM信号的占空比，增大第二PWM信号的占空比，使降压变换器50输出的最大驱动电压大于或者等于200V，基准电流为0.1A，待驱动LED灯条可以正常工作。在减小第一PWM信号的占空比，增大第二PWM信号的占空比，使降压变换器50输出的最大驱动电压大于或者等于200V，基准电流为0.1A后，将背光驱动装置与待驱动LED灯条组装在一起，LED灯条也可以正常工作。
当待驱动LED灯条的规格参数为200V/0.15A时，在将背光驱动装置与待驱动LED灯条组装在一起后，增大第二PWM信号的占空比，使降压变换器50输出的最大驱动电压大于或者等于200V，待驱动LED灯条可以正常工作。在增大第二PWM信号的占空比，使降压变换器50输出的最大驱动电压大于或者等于200V后，将背光驱动装置与待驱动LED灯条组装在一起，待驱动LED灯条也可以正常工作。
当待驱动LED灯条的规格参数为50V/0.15A时，直接将背光驱动装置与待驱动LED灯条组装在一起，LED灯条可以正常工作。在将背光驱动装置与待驱动LED灯条组装在一起后，减小第二PWM信号的占空比，使降压变换器50输出的最大驱动电压在50V至100V之间，LED灯条也可以正常工作。在减小第二PWM信号的占空比，使降压变换器50输出的最大驱动电压在50V至100V之间后，将背光驱动装置与待驱动LED灯条组装在一起，待驱动LED灯条也可以正常工作。
值得一提的是，在组装背光驱动装置与待驱动LED灯条时，要求背光驱动装置与待驱动LED灯条可拆卸连接，且两者之间能够形成电流回路。其具体连接方式此处不做限制。
易于理解的是，本发明提出的背光驱动装置可以根据待驱动LED灯条的规格参数自适应调节其输出参数，使得待驱动LED灯条正常工作，兼容性强。
如图2所示，在一较佳实施例中，上述驱动支路30的降压变换器50为多个，各降压变换器50分别用于根据第一电压信号和第二电压信号对交流/直流变换器10输出的直流电进行电流和电压控制，以驱动各自对应的LED灯条工作。
本实施例中，每一驱动支路30所具有的降压变换器50的数量可以是2个，3个，4个，甚至更多，此处不做限制。需要说明的是，在本发明提出的背光驱动装置同时输出多路相同的最大驱动电路/基准电流时，不限制各降压变换器50所对应的LED灯条的规格参数相同。
比如，每一驱动支路30的降压变换器50数量为4个，每一降压变换器50输出的最大驱动电压/基准电流为200V/0.15A。则与各降压变换器50对应的LED灯条的规格参数可以是200V/0.15A，180V/0.15A，150V/0.15A和180V/0.15A；也可以是110V/0.15A，120V/0.15A，140V/0.15A和150V/0.15A。当然，与各降压变换器50对应的LED灯条的规格参数还可以是其它的组合，此处不一一列举。
可以理解的是，改变驱动支路30所具有的降压变换器50的数量，就可以改变背光驱动装置的输出接口数，从而进一步提高背光驱动装置的兼容性。
如图3所示，在一较佳实施例中，本发明提出的背光驱动装置还具有调光功能，具体地，控制模块20还用于输出调节LED灯条亮度的第三PWM信号；驱动支路30还包括用于将第一PWM信号转换成对应的第一电压信号的又一个接口模块40、以及将第三电压信号转换成对应的电流信号的电压/电流转换器60；降压变换器50用于根据第一电压信号、第二电压信号和电流信号对交流/直流变换器60输出的直流电进行电流和电压控制，以驱动LED灯条工作。
需要说明的是，本实施例中，控制模块20包括控制芯片(图未示出)及其外围电路（图未示出），控制芯片包括存储单元（图未示出）及控制单元（图未示出）。存储单元用于存储计算机输入的控制程序；控制单元用于根据存储单元所存储的控制程序输出对应的第一PWM信号、第二PWM信号，以及结合电视机主板输入的调光信号输出对应的第三PWM信号，在需要改变第一PWM信号和/或第二PWM信号的占空比时，可以通过改变计算机输入的控制程序实现，在需要改变第三PWM信号的占空比时，可以通过改变电视机主板输入的调光信号实现。本领域技术人员容易想到的是，上述控制芯片的具体型号可以有多种，与控制芯片相应的外围电路的电路结构也有多种，此处均不做具体限制。其中，电压/电流转换器60可以是电阻模块，出于简化电路结构考虑，电压/电流转换器60优选为转换电阻RT。
在背光驱动装置与待驱动LED灯条组装在一起后，将背光驱动装置接入市电，交流/直流转换器10将市电转换成稳定的直流后提供给LED灯条，并实现交流电与直流电的隔离。与此同时，控制模块20输出第一PWM信号、第二PWM信号及第三PWM信号至驱动支路30，驱动支路30中的一个接口模块40将第一PWM信号转换成对应的第一电压信号，另一个接口模块40将第二PWM信号转换成对应的第二电压信号，又一个接口模块40将第三PWM信号转换成对应的第三电压信号；电压/电流转换器60将第三电压信号转换成对应的电流信号。降压变换器50根据第一电压信号调节其输出的基准电流，根据第二电压信号调节其最大输出电压，根据电流信号调节其输出电流。
当需要调节LED灯条的亮度时，可以通过改变主板输出的调光信号来改变控制模块20输出的第三PWM信号的占空比，从而改变背光驱动装置的输出电流，达到调节LED灯条的亮度的目的。
如图4所示，在一较佳实施例中，驱动支路30的降压变换器50为多个，各降压变换器50用于根据第一电压信号、第二电压信号和电流信号对交流/直流变换器10输出的直流电进行电流和电压控制，以驱动LED灯条工作。
本实施例中，每一驱动支路30所具有的降压变换器50的数量可以是2个，3个，4个，甚至更多，此处不做限制。需要说明的是，在本发明提出的背光驱动装置同时输出多路相同的最大驱动电路/基准电流时，不限制各降压变换器50所对应的LED灯条的规格参数相同。
比如，每一驱动支路30的降压变换器50数量为4个，每一降压变换器50输出的最大驱动电压/驱动电流为200V/0.15A。则与各降压变换器50对应的LED灯条的规格参数可以是120V/0.15A，120V/0.15A，150V/0.15A和120V/0.15A；也可以是130V/0.15A，140V/0.15A，150V/0.15A和160V/0.15A。当然，与各降压变换器50对应的LED灯条的规格参数还可以是其它的组合，此处不一一列举。
可以理解的是，驱动支路30所具有的降压变换器50的数量越多，背光驱动装置的输出接口也就越多，兼容性也就越强。
如图5所示，在一较佳实施例中，每一接口模块40包括保护单元100、电压跟随单元200及电压输出单元300；保护单元100的输入端与控制模块20连接，保护单元100的输出端与电压跟随单元200的输入端连接，电压跟随单元200的输出端与电压输出单元300的输入端连接，电压输出单元300的输出端用于输出电压信号。
需要说明的是，当控制模块20中的控制程序运行正常时，接口模块40接收到正常的PWM信号，保护单元10及电压跟随单元20输出与输入的PWM信号波形相同的PWM信号，电压输出单元30将输入的PWM信号进行积分滤波处理，以输出大小与输入的PWM信号的占空比对应的电压信号。当控制模块20中的控制程序运行异常时，接口模块40接收到持续的低电平信号或者持续的高电平信号，保护单元100、电压跟随单元200及电压输出单元300输出电压都为零，电路得到保护。
如图5所示，在一较佳实施例中，保护单元100包括第一电容C1；第一电容C1的第一端为保护单元100的输入端，第一电容C1的第二端为保护单元100的输出端。
众所周知的是，电容元件具有通交流隔直流的功能。当输入至第一电容C1的第一端的电信号为正常的PWM信号时，第一电容C1的第二端输出与该PWM信号波形相同的电信号；当输入至第一电容C1的第一端的电信号为持续的高电平信号或者持续的低电平信号时，第一电容C1的第二端不输出。这样，保护单元100就实现了对电路的保护功能。
如图5所示，在一较佳实施例中，电压跟随单元200包括第一二极管D1、第一三极管Q1、第二三极管Q2、第一电阻R1、第二电阻R2、第三电阻R3及第四电阻R41；第一二极管D1的阴极与第一三极管Q1的基极连接，其连接节点为电压跟随单元200的输入端；第一三极管Q1的集电极、第一电阻R1的第二端及第三电阻R3的第一端互连，第一电阻R1的第一端及第二电阻R2的第一端与参考电源VREF连接，第三电阻R3的第二端、第四电阻R4的第一端及第二三极管Q2的基极互连，第二三极管Q2的集电极与第二电阻R2的第二端连接，其连接节点为电压跟随单元200的输出端；第一二极管D1的阳极、第一三极管Q1的发射极、第四电阻R4的第二端及第二三极管Q2的发射极接地GND。
需要说明的是，本实施例中，第一三极管Q1及第二三极管Q2均为NPN型三极管。
当电压跟随单元200输入高电平信号时，第一三极管Q1导通，第一三极管Q1的集电极电压被拉低。第二三极管Q2的基极电压被拉低，第二三极管Q2截止，第二三极管Q2的集电极电压被拉高，电压跟随单元200输出高电平信号。当电压跟随单元200输入低电平信号时，第一三极管Q1截止，第一三极管Q1的集电极电压被拉高。第二三极管Q2的基极电压被拉高，第二三极管Q2导通，第二三极管Q2的集电极电压被拉低，电压跟随单元200输出低电平信号。
如图5所示，在一较佳实施例中，电压输出单元300包括第二电容C2、第三电容C3、第五电阻R5及第六电阻R6；第五电阻R5的第一端为电压输出单元300的输入端；第五电阻R5的第二端、第二电容C2的第一端及第六电阻R6的第一端互连，第六电阻R6的第二端与第三电容C3的第一端连接，其连接节点为电压输出单元300的输出端；第二电容C2的第二端及第三电容C3的第二端接地GND。
需要说明的是，本实施例中，第二电容C2与第五电阻R5构成充放电电路，第三电容C3与第六电阻R6构成滤波电路。
当输入至电压输出单元300的电信号为高电平时，第二电容C2通过第五电阻R5充电；当输入至电压输出单元300的电信号为低电平时，第二电容C2通过第五电阻R5放电。可以理解的是，输入至电压输出单元300的PWM信号的占空比越大，第二电容C2的充电时间越长，电压输出单元300输出的电压越大；反之，电压输出单元300输出的电压越小。
以下，结合图1至图5，说明本发明背光驱动装置的工作原理：
首先，将背光驱动装置与待驱动LED灯条组装在一起。
然后，将背光驱动装置接入市电，交流/直流转换器10将市电电压转换成稳定的直流电后提供给LED灯条，并实现交流电与直流电的隔离。
接着，根据待驱动LED灯条的规格参数，通过计算机向控制模块20输入控制程序，以使控制模块20输出合适占空比的第一PWM信号、第二PWM信号及第三PWM信号。若控制模块20中的控制程序运行正常，驱动支路30中的接口模块40输出大小与各PWM信号占空比对应的第一电压信号，第二电压信号及第三电压信号；电压/电流转换器60输出大小与第三电压信号幅值对应的电流信号；至少一个降压变换器50根据第一电压信号调节其输出的基准电流，根据第二电压信号调节其输出的最大驱动电压，根据电流信号调节其输出电流。若控制模块20中的控制程序运行异常，各降压变换器50都不输出。
此后，若需要调节LED灯条的亮度，可以通过改变电视机主板输出的调光信号改变降压变换器50的输出电流来实现。在更换LED灯条后，若当前LED灯条的规格参数与背光驱动装置当前的输出参数不匹配，则可以通过计算机改变控制模块中20的控制程序，使背光驱动装置的输出参数与当前LED灯条的规格参数相匹配，非常简便。
本发明还提出一种电视机，该电视机包括如上所述的背光驱动装置，该背光驱动装置的具体结构参照上述实施例，由于本电视机采用了上述所有实施例的全部技术方案，因此至少具有上述实施例的技术方案所带来的所有有益效果，在此不再一一赘述。
以上所述仅为本发明的优选实施例，并非因此限制本发明的专利范围，凡是在本发明的发明构思下，利用本发明说明书及附图内容所作的等效结构变换，或直接/间接运用在其他相关的技术领域均包括在本发明的专利保护范围内。

Claims (20)

  1. 一种背光驱动装置，其特征在于，包括交流/直流转换器、控制模块及驱动支路；其中，
    所述交流/直流转换器，用于将交流电转换成直流电并提供给LED灯条；
    所述控制模块，用于输出调节降压变换器输出电流基准的第一PWM信号，以及输出调节所述降压变换器输出电压的第二PWM信号；
    所述驱动支路包括：两个接口模块及降压变换器，其中一个接口模块用于将所述第一PWM信号转换成对应的第一电压信号，另一个接口模块用于将所述第二PWM信号转换成对应的第二电压信号，
    所述降压变换器，用于根据所述第一电压信号和所述第二电压信号对所述交流/直流变换器输出的直流电进行电流和电压控制，以驱动所述LED灯条工作。
  2. 如权利要求1所述的背光驱动装置，其特征在于，每一所述接口模块包括保护单元、电压跟随单元及电压输出单元；
    所述保护单元的输入端与所述控制模块连接，所述保护单元的输出端与所述电压跟随单元的输入端连接，所述电压跟随单元的输出端与所述电压输出单元的输入端连接，所述电压输出单元的输出端用于输出电压信号。
  3. 如权利要求1所述的背光驱动装置，其特征在于，所述控制模块包括控制芯片及其外围电路，所述控制芯片包括：
    存储单元，用于存储计算机输入的控制程序；
    控制单元，用于根据所述存储单元所存储的控制程序输出对应的第一PWM信号和第二PWM信号。
  4. 如权利要求1所述的背光驱动装置，其特征在于，所述驱动支路的降压变换器为多个，各所述降压变换器分别用于根据所述第一电压信号和所述第二电压信号对所述交流/直流变换器输出的直流电进行电流和电压控制，以驱动各自对应的所述LED灯条工作。
  5. 如权利要求4所述的背光驱动装置，其特征在于，每一所述接口模块包括保护单元、电压跟随单元及电压输出单元；
    所述保护单元的输入端与所述控制模块连接，所述保护单元的输出端与所述电压跟随单元的输入端连接，所述电压跟随单元的输出端与所述电压输出单元的输入端连接，所述电压输出单元的输出端用于输出电压信号。
  6. 如权利要求1所述的背光驱动装置，其特征在于，所述控制模块还用于输出调节所述LED灯条亮度的第三PWM信号；
    所述驱动支路还包括用于将所述第三PWM信号转换成对应的第三电压信号的又一个接口模块、以及将所述第三电压信号转换成对应的电流信号的电压/电流转换器；
    所述降压变换器，用于根据所述第一电压信号、所述第二电压信号和所述电流信号对所述交流/直流变换器输出的直流电进行电流和电压控制，以驱动所述LED灯条工作。
  7. 如权利要求6所述的背光驱动装置，其特征在于，每一所述接口模块包括保护单元、电压跟随单元及电压输出单元；
    所述保护单元的输入端与所述控制模块连接，所述保护单元的输出端与所述电压跟随单元的输入端连接，所述电压跟随单元的输出端与所述电压输出单元的输入端连接，所述电压输出单元的输出端用于输出电压信号。
  8. 如权利要求6所述的背光驱动装置，其特征在于，所述控制模块可根据电视机主板输入的调光信号输出对应的第三PWM信号。
  9. 如权利要求6所述的背光驱动装置，其特征在于，所述驱动支路的降压变换器为多个，各所述降压变换器用于根据所述第一电压信号、所述第二电压信号和所述电流信号对所述交流/直流变换器输出的直流电进行电流和电压控制，以驱动所述LED灯条工作。
  10. 如权利要求9所述的背光驱动装置，其特征在于，每一所述接口模块包括保护单元、电压跟随单元及电压输出单元；
    所述保护单元的输入端与所述控制模块连接，所述保护单元的输出端与所述电压跟随单元的输入端连接，所述电压跟随单元的输出端与所述电压输出单元的输入端连接，所述电压输出单元的输出端用于输出电压信号。
  11. 如权利要求9所述的背光驱动装置，其特征在于，所述保护单元包括第一电容；所述第一电容的第一端为所述保护单元的输入端，所述第一电容的第二端为所述保护单元的输出端。
  12. 如权利要求9所述的背光驱动装置，其特征在于，所述电压跟随单元包括第一二极管、第一三极管、第二三极管、第一电阻、第二电阻、第三电阻及第四电阻；所述第一二极管的阴极与所述第一三极管的基极连接，其连接节点为所述电压跟随单元的输入端；所述第一三极管的集电极、所述第一电阻的第二端及所述第三电阻的第一端互连，所述第一电阻的第一端及所述第二电阻的第一端与参考电源连接，所述第三电阻的第二端、所述第四电阻的第一端及所述第二三极管的基极互连，所述第二三极管的集电极与所述第二电阻的第二端连接，其连接节点为所述电压跟随单元的输出端；所述第一二极管的阳极、所述第一三极管的发射极、所述第四电阻的第二端及所述第二三极管的发射极接地。
  13. 如权利要求9所述的背光驱动装置，其特征在于，所述电压输出单元包括第二电容、第三电容、第五电阻及第六电阻；所述第五电阻的第一端为所述电压输出单元的输入端；所述第五电阻的第二端、所述第二电容的第一端及所述第六电阻的第一端互连，所述第六电阻的第二端与所述第三电容的第一端连接，其连接节点为所述电压输出单元的输出端；所述第二电容的第二端及所述第三电容的第二端接地。
  14. 一种电视机，其特征在于，包括如权利要求1所述的背光驱动装置。
  15. 如权利要求14所述的电视机，其特征在于，所述控制模块包括控制芯片及其外围电路，所述控制芯片包括：
    存储单元，用于存储计算机输入的控制程序；
    控制单元，用于根据所述存储单元所存储的控制程序输出对应的第一PWM信号和第二PWM信号。
  16. 如权利要求14所述的电视机，其特征在于，所述驱动支路的降压变换器为多个，各所述降压变换器分别用于根据所述第一电压信号和所述第二电压信号对所述交流/直流变换器输出的直流电进行电流和电压控制，以驱动各自对应的所述LED灯条工作。
  17. 如权利要求16所述的电视机，其特征在于，每一所述接口模块包括保护单元、电压跟随单元及电压输出单元；
    所述保护单元的输入端与所述控制模块连接，所述保护单元的输出端与所述电压跟随单元的输入端连接，所述电压跟随单元的输出端与所述电压输出单元的输入端连接，所述电压输出单元的输出端用于输出电压信号。
  18. 如权利要求14所述的电视机，其特征在于，所述控制模块还用于输出调节所述LED灯条亮度的第三PWM信号；
    所述驱动支路还包括用于将所述第三PWM信号转换成对应的第三电压信号的又一个接口模块、以及将所述第三电压信号转换成对应的电流信号的电压/电流转换器；
    所述降压变换器，用于根据所述第一电压信号、所述第二电压信号和所述电流信号对所述交流/直流变换器输出的直流电进行电流和电压控制，以驱动所述LED灯条工作。
  19. 如权利要求18所述的电视机，其特征在于，所述驱动支路的降压变换器为多个，各所述降压变换器用于根据所述第一电压信号、所述第二电压信号和所述电流信号对所述交流/直流变换器输出的直流电进行电流和电压控制，以驱动所述LED灯条工作。
  20. 如权利要求19所述的电视机，其特征在于，每一所述接口模块包括保护单元、电压跟随单元及电压输出单元；
    所述保护单元的输入端与所述控制模块连接，所述保护单元的输出端与所述电压跟随单元的输入端连接，所述电压跟随单元的输出端与所述电压输出单元的输入端连接，所述电压输出单元的输出端用于输出电压信号。
PCT/CN2016/112467 2016-08-31 2016-12-27 背光驱动装置和电视机 WO2018040420A1 (zh)

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