WO2020181830A1 - 显示装置及供电控制方法 - Google Patents

显示装置及供电控制方法 Download PDF

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Publication number
WO2020181830A1
WO2020181830A1 PCT/CN2019/120047 CN2019120047W WO2020181830A1 WO 2020181830 A1 WO2020181830 A1 WO 2020181830A1 CN 2019120047 W CN2019120047 W CN 2019120047W WO 2020181830 A1 WO2020181830 A1 WO 2020181830A1
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WO
WIPO (PCT)
Prior art keywords
module
power
power supply
switch
voltage
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Application number
PCT/CN2019/120047
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English (en)
French (fr)
Inventor
杨杰
高宽志
韩文涛
Original Assignee
青岛海信电器股份有限公司
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Publication of WO2020181830A1 publication Critical patent/WO2020181830A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • 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
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Definitions

  • This application relates to automatic control technology, in particular to a display device and a power supply control method.
  • the power supply circuit is one of the most important circuit structures in the display device.
  • the power supply circuit can provide power to the display device so that the display device can operate normally.
  • Some display devices are provided with an independent power supply board, and some display devices combine the power supply board and the main board into one.
  • the power supply circuit of the display device is connected to alternating current, and then the connected alternating current is processed and converted into direct current that can be used by the load, and a transformer is used for this processing.
  • an optocoupler isolation needs to be set between the secondary side and the primary side to isolate and transmit user control signals through the optocoupler.
  • the existing power supply circuit may have the following problems: it contains many components and high circuit complexity; the optocoupler device needs to be tested for electromagnetic compatibility and EMC, which increases the production cycle of the product; when the optocoupler fails, it may be due to primary and secondary Insufficient pressure resistance causes safety hazards.
  • the present application provides a display device to solve the problem of high circuit complexity of the power supply control module in the existing display device.
  • the present application provides a display device, including:
  • the power supply board is provided with:
  • the power supply control module is respectively connected to the voltage output terminal of the first power module and the voltage input terminal of the second power module, and the voltage output terminal is connected to the primary terminal of the transformer in the first power module , The voltage input terminal is connected to the primary terminal of the transformer in the second power module;
  • the power supply control module is configured to control whether the first power supply module supplies power to the second power supply module according to the voltage value of the voltage output terminal.
  • the power supply control module includes:
  • the comparison unit is respectively connected to the switch unit and the voltage output terminal, and the switch unit is respectively connected to the voltage output terminal, the voltage input terminal, and ground;
  • the comparison unit is used to control whether the first power supply module supplies power to the second power supply module by controlling the conduction state of the switch unit according to the voltage value of the voltage output terminal.
  • the switch unit includes:
  • the first switch subunit and the second switch subunit are The first switch subunit and the second switch subunit;
  • the first switch subunit is respectively connected to the comparison unit, the second switch subunit, and ground, and the second switch subunit is respectively connected to the voltage output terminal and the voltage input terminal, so The conduction state of the first switch subunit is controlled by the comparison unit, and the conduction state of the second switch subunit is controlled by the first switch subunit.
  • the first switch subunit includes:
  • the first resistor is connected between the comparison unit and ground, the emitter and the base of the first triode are connected to both ends of the first resistor, and the The collector is connected to the second switch subunit.
  • the first switch subunit further includes:
  • the first protection resistor
  • the first protection resistor is connected between the first resistor and the comparison unit.
  • the second switch subunit includes:
  • the second resistor is connected between the voltage output terminal and the first switch subunit, the emitter and the base of the second triode are connected to both ends of the second resistor, so The collector of the second triode is connected to the voltage input terminal.
  • the second switch subunit further includes:
  • the second protection resistor is connected between the second resistor and the first switch subunit.
  • the first power module is a flyback switch FLYBACK power module
  • the second power module is a resonance conversion LLC power module
  • the comparison unit is a Zener diode
  • the switch unit further includes:
  • the third switch subunit
  • the third switch subunit is respectively connected to the second switch subunit and the voltage input terminal, and the conduction state of the third switch subunit is controlled by the second switch subunit.
  • the third switch subunit includes:
  • the third resistor is connected between the second switch subunit and the ground, the base and collector of the third triode are connected to both ends of the third resistor, and the third The emitter of the stage tube is connected to the voltage input terminal.
  • the present application also provides a power supply control method.
  • the power supply control module determines whether the voltage value of the voltage output terminal exceeds a preset value; if so, the power supply control module controls the first power supply module to provide The second power supply module supplies power; if not, the power supply control module controls the first power supply module not to supply power to the second power supply module.
  • Figure 1a is a schematic structural diagram of a display device provided with an independent power supply board
  • Figure 1b is a schematic diagram of the connection relationship between the power board and the load
  • Figure 1c is a schematic diagram 1 of an optional power supply board
  • Figure 1d is a schematic diagram of an optional circuit structure of the FLYBACK module
  • Figure 1e is a schematic diagram of an optional circuit structure of the LLC module
  • Figure 1f is a schematic diagram of an optional circuit structure of a power supply control module
  • Figure 2 is a second schematic diagram of an optional power board structure
  • Figure 3 is a schematic diagram three of an optional power board structure
  • Figure 4 is a schematic diagram four of an optional power board structure
  • Figure 5 is an optional power board structure diagram five
  • FIG. 6 is a schematic diagram of another optional circuit structure of the FLYBACK module.
  • Figure 7 is a schematic diagram of an optional power board structure six
  • Fig. 8 is a schematic flowchart of an alternative power supply control method.
  • MOS tube drive circuit module of LLC module 46 MOS tube drive circuit module of LLC module 46;
  • FIG. 1a is a schematic diagram of the structure of the display device provided with an independent power supply board.
  • the display device includes Panel 1, backlight assembly 2, main board 3, power supply board 4, rear case 5 and base 6.
  • the panel 1 is used to present images to the user;
  • the backlight assembly 2 is located under the panel 1, usually some optical components, used to supply sufficient brightness and uniformly distributed light sources, so that the panel 1 can display images normally, and the backlight assembly 2 also Including the backplane 20, the mainboard 3 and the power supply board 4 are arranged on the backboard 20, and some convex structures are usually stamped on the backboard 20.
  • the mainboard 3 and the power supply board 4 are fixed on the convex hulls by screws or hooks; the back shell 5
  • the cover is arranged on the panel 1 to hide the display device components such as the backlight assembly 2, the main board 3 and the power supply board 4, which has a beautiful effect; the base 6 is used to support the display device.
  • FIG. 1b is a schematic diagram of the connection relationship between the power board and the load 7.
  • the power board 4 includes an input terminal 41 and an output terminal 42 (the figure shows a first output terminal 421, a second output terminal 422, The third output terminal 423), where the input terminal 41 is connected to the mains, the output terminal 42 is connected to the load 7, for example, the first output terminal 421 is connected to the light bar 71, the second output terminal 422 is connected to the speaker 72, and the third The output terminal 423 is connected to the main board 3.
  • the power board 4 needs to convert the AC mains power into the DC power required by the load, and the DC power usually has different specifications, for example, 18V is required for audio and 12V for panel.
  • Figure 1c is a schematic diagram of an optional power board structure.
  • the power board shown in Figure 1c is provided with: a rectifier module 43, a power factor correction (PFC) module 44, and a flyback switch (Flyback Transformer, FLYBACK).
  • a rectifier module 43 a power factor correction (PFC) module 44
  • a flyback switch Flyback Transformer, FLYBACK
  • LLC Resonant Converter
  • Power supply control module 47 wherein the rectifier module 43, FLYBACK module 45 and LLC module 46 are all connected to the PFC module 44, and the FLYBACK module 45 and LLC module 46 are powered by The control module 47 is connected.
  • the function of the rectifier module 43 is to rectify the alternating current provided by the mains power supply into direct current, and output it to the PFC module 44.
  • An electromagnetic interference (EMI) filter (not shown in Figure 1c) can be connected before the PFC module 44. Show), high-frequency filtering is performed on the input AC power.
  • the PFC module 44 generally includes a PFC inductor, a switching power device, and a PFC control chip. Its function is to perform power factor correction on the input AC power supply.
  • the DC power output by the rectifier module 43 is boosted to obtain a stable DC bus voltage (such as 380V) and output to the FLYBACK module 45 and LLC module 46.
  • the PFC module 44 can effectively improve the power factor of the power supply and ensure that the voltage and current are in the same phase.
  • the FLYBACK module 45 is respectively connected to the main board 3 and the audio 72 and other loads to supply power to these components.
  • the FLYBACK module is also used to provide its own power supply voltage and standby power to the PFC module 44 and the LLC module 46.
  • the LLC module 46 is connected to the light bar 71.
  • the LLC module 46 may use dual MOS tubes.
  • the synchronous rectification circuit is arranged in the LLC module 46.
  • the synchronous rectification circuit may mainly include a transformer, a controller, two MOS tubes, and diodes.
  • the LLC module 46 may also include pulse frequency modulation (PFM) circuits, capacitors, inductors, and other components.
  • PFM pulse frequency modulation
  • the LLC module 46 can specifically step down or step up the DC bus voltage input by the PFC module 44, and output a constant voltage to the load 7 (for example, the light bar 71).
  • the LLC module 46 can output a variety of different voltages to meet the demand of the load.
  • the working principle of the above-mentioned power supply control module 47 is: when the display device receives a power-on instruction, the power supply control module 47 controls the FLYBACK module 45 to supply power to the LLC module 46 normally, so that the display device can display images normally; when the display device receives a standby instruction The power supply control module 47 controls the FLYBACK module 45 not to supply power to the LLC module 46, so that the LLC module 46 does not work in the standby state, thereby reducing the standby power consumption of the display device.
  • the power supply control module 47 directly uses the signal triggered by the user on the secondary side of the transformer as a control signal to control whether the FLYBACK module 45 supplies power to the LLC module 46.
  • the voltage output terminal of the FLYBACK module 45 and the LLC module 46 The voltage input ends of are all connected to the primary end of the transformer, and the above control method will cause the circuit complexity of the power supply control module 47 to be high.
  • FIG. 1c is a schematic structural diagram of an optional power supply board.
  • the power supply board shown in FIG. 1c includes modules: FLYBACK module 45, LLC module 46, and power supply control module 47.
  • FIG. 1d is a schematic diagram of an optional circuit structure of the FLYBACK module 45.
  • the FLYBACK module 45 is provided with a transformer 450, and the transformer 450 includes a primary end 451 and a secondary end 452.
  • the primary end 451 is connected to the power chip control circuit module 453, the MOS tube drive circuit module 454, and the power supply module 455.
  • the power chip control circuit module 453 is used to process the primary voltage sampling, current sampling, and secondary output voltage feedback signals to output A reasonable pulse width modulation (Pulse Width Modulation, PWM) control signal is used to control the switching of the MOS tube driving circuit module 454.
  • PWM Pulse Width Modulation
  • the MOS tube driving circuit module 454 generates variable voltage and current through its own switching, and transmits energy to the secondary through the transformer 450.
  • the power supply module 455 is used to output a stable voltage to supply power to the FLYBACK and LLC control chips.
  • the secondary terminal 452 is connected to the secondary rectifier circuit module 456, and the secondary rectifier circuit module 456 is used to convert the rectangular wave into a stable DC output through the rectifier diode and output electrolysis.
  • the voltage output terminal 48 of the FLYBACK module 45 is connected to the power supply module 455, and the control signal input terminal 31 of the main board 3 is connected to the secondary rectifier circuit module 456.
  • FIG. 1e is a schematic diagram of an optional circuit structure of the LLC module 46.
  • the LLC module 46 is provided with a transformer 460, and the transformer 460 includes a primary end 461 and a secondary end 462.
  • the power chip control circuit module 463 is used to output reasonable pulse width modulation by processing primary voltage sampling, current sampling and secondary output voltage feedback signals
  • the (Pulse Width Modulation, PWM) control signal is used to control the switching of the MOS tube driving circuit module 464.
  • the MOS tube driving circuit module 464 generates varying voltage and current through its own switching, and transmits energy to the secondary through the transformer 460.
  • the secondary end 462 is connected to the secondary rectifier circuit module 466, and the secondary rectifier circuit module 466 is used to convert the rectangular wave into a stable DC output through the rectifier diode and output electrolysis.
  • the voltage input terminal 49 of the LLC module 46 is connected to the power chip control circuit module 463.
  • FIG. 1f is a schematic diagram 1 of an optional circuit structure of the power supply control module 47. As shown in Figure 1f, the specific control process of the power supply control module 47 is:
  • the main board 3 After the user sends a boot command to the main board 3 through a trigger device such as a remote control, the main board 3 inputs a high level signal to the control signal input terminal 31 according to the boot command, the transistor V905 is turned on, and the light-emitting terminal 1 and 2 of the optocoupler N851 are turned on , The optocoupler starts to work, V904 is turned on, so that the voltage output terminal 48 of the FLYBACK module 45 and the voltage input terminal 49 of the LLC module 46 are connected, so that the FLYBACK module 45 supplies the LLC module 46 with normal power, and the load of the LLC module 46 (lamp Bar 71) is turned on, and the user can watch the image normally.
  • the main board 3 When the user sends a standby instruction to the main board 3 through a trigger device such as a remote control, the main board 3 inputs a low-level signal to the control signal input terminal 31 according to the standby instruction, the transistor V905 does not conduct, and the light-emitting terminals 1 and 2 of the optocoupler N851 No conduction, the optocoupler does not work, so V904 will not conduct, so that the voltage output terminal 48 of the FLYBACK module 45 and the voltage input terminal 49 of the LLC module 46 are isolated, so that the FLYBACK module 45 cannot provide the LLC module 46 normally Power is supplied, the load (light bar 71) of the LLC module 46 is turned off, and the display device is switched to a standby state.
  • a trigger device such as a remote control
  • control signal input terminal 31 is connected to the secondary terminal of the transformer 450
  • the voltage output terminal 48 is connected to the primary terminal of the transformer 450
  • the voltage input terminal 49 is connected to the primary terminal of the transformer 460.
  • the power supply control module 47 directly uses the signal of the control signal input 31 as a control signal to control whether the FLYBACK module 45 supplies power to the LLC module 46, in order to isolate the high voltage danger at the primary side of the transformer and realize the transmission of control signals.
  • the optocoupler isolation N851 is set in the power supply control module 47.
  • FIG. 2 is a second schematic diagram of an optional power board structure.
  • the power board 4 shown in FIG. 2 is provided with a FLYBACK module 45, an LLC module 46, and a power supply control module 47; wherein the power supply control module 47 is connected to the voltage output terminal 48 of the FLYBACK module 45 and the voltage output terminal 48 of the LLC module 46, respectively.
  • the voltage input terminal 49 is connected, the voltage output terminal 48 is connected to the primary terminal 451 of the transformer 450 in the FLYBACK module 45, and the voltage input terminal 49 is connected to the primary terminal 461 of the transformer 460 in the LLC module 46.
  • the power supply control module 47 is used to control whether the FLYBACK module 45 supplies power to the LLC module 46 according to the voltage value of the voltage output terminal 48.
  • FIG. 3 is a third structural diagram of an optional power supply board.
  • the power supply control module 47 may include: a comparison unit 421' and a switch unit 422'.
  • the comparison unit 421' is respectively connected to the switch unit 422' and the voltage output terminal 48, and the switch unit 422' is respectively connected to the voltage output terminal 48, the voltage input terminal 49 and ground.
  • the comparison unit 421 ′ is used to control whether the FLYBACK module 45 supplies power to the LLC module 46 by controlling the conduction state of the switch unit 422 ′ according to the voltage value of the voltage output terminal 48.
  • the control principle of the power supply control module 47 shown in FIG. 3 is:
  • the main board 3 When the user sends a standby instruction to the main board 3 through a trigger device such as a remote control, the main board 3 inputs a low-level signal to the FLYBACK module 45 according to the standby instruction. After the FLYBACK module 45 receives the low-level signal, the control voltage output terminal 48 outputs When the voltage value of the voltage output terminal 48 is smaller than the preset value, the comparison unit 421' controls the switch unit 422' to cut off, and when the switch unit 422' is cut off, the voltage output If there is no conduction between the terminal 48 and the voltage input terminal 49, the FLYBACK module 45 will not supply power to the LLC module 46.
  • the main board 3 After the user sends a power-on instruction to the main board 3 through a trigger device such as a remote control, the main board 3 inputs a high-level signal to the FLYBACK module 45 according to the power-on instruction. After the FLYBACK module 45 receives the high-level signal, the control voltage output terminal 48 outputs When the voltage value of the voltage output terminal 48 is greater than the preset value, the comparison unit 421' controls the switch unit 422' to turn on, so that the voltage output terminal 48 and the voltage input terminal 49 Then, the FLYBACK module 45 starts to supply power to the LLC module 46.
  • the corresponding relationship between the instruction sent by the user to the main board 3 and the level signal is not limited to the above-mentioned corresponding relationship, and may also be a standby instruction corresponding to a high-level signal, and a power-on instruction corresponding to a low-level signal.
  • the comparison unit 421 ′ may be a Zener diode, and the aforementioned voltage preset value is the reverse breakdown voltage value of the Zener diode.
  • the power supply control module 47 directly uses the voltage change of the voltage output terminal 48 of the FLYBACK module 45 as a control signal to control whether to supply power to the LLC module 46, which simplifies the circuit structure and shortens the production cycle of the display device. At the same time, potential safety hazards caused by insufficient primary and secondary insulation pressure are avoided.
  • FIG. 4 is a fourth schematic diagram of an optional power supply board structure.
  • the switch unit 422' includes: a first switch The sub-unit 4221' and the second switch sub-unit 4222'.
  • the first switch sub-unit 4221' is respectively connected to the comparison unit 421', the second switch sub-unit 4222' and ground, and the second switch sub-unit 4222' is respectively connected to the voltage output terminal 48 And the voltage input terminal 49 is connected, the conduction state of the first switch subunit 4221' is controlled by the comparison unit 421', and the conduction state of the second switch subunit 4222' is controlled by the first switch Sub-unit 4221' control.
  • the control principle of the power supply control module 47 shown in FIG. 4 is:
  • the main board 3 When the user sends a standby instruction to the main board 3 through a trigger device such as a remote control, the main board 3 inputs a low-level signal to the FLYBACK module 45 according to the standby instruction. After the FLYBACK module 45 receives the low-level signal, the control voltage output terminal 48 outputs When the voltage value of the voltage output terminal 48 is less than the preset value, the comparison unit 421' controls the first switch subunit 4221' to cut off, and the first switch subunit 4221' cuts off for further control The second switch subunit 4222' is cut off, and the voltage output terminal 48 and the voltage input terminal 49 cannot be conducted, and the FLYBACK module 45 will not supply power to the LLC module 46.
  • the main board 3 After the user sends a power-on instruction to the main board 3 through a trigger device such as a remote control, the main board 3 inputs a high-level signal to the FLYBACK module 45 according to the power-on instruction. After the FLYBACK module 45 receives the high-level signal, the control voltage output terminal 48 outputs When the voltage value of the voltage output terminal 48 is greater than the preset value, the comparison unit 421' controls the first switch sub-unit 4221' to conduct, and the first switch sub-unit 4221' cuts off the further The second switch subunit 4222 ′ is controlled to be turned on, and thus the voltage output terminal 48 and the voltage input terminal 49 are turned on, and the FLYBACK module 45 starts to supply power to the LLC module 46.
  • a trigger device such as a remote control
  • FIG. 5 is a schematic diagram five of an optional power supply board structure.
  • the first switch subunit 4221' may include:
  • the second switch subunit 4222' may include: a second tertiary tube 425' and a second resistor 426'; the second resistor 426' is connected to the voltage output terminal 48 and the first switch subunit 4221 ′, the emitter and base of the second transistor 425′ are connected to both ends of the second resistor 426′, and the collector of the second transistor 425′ is connected to the voltage input terminal 49 connections.
  • the first switch subunit 4221' may further include: a first protection resistor 427'; the first protection resistor 427' is connected between the first resistor 424' and the comparison unit 421'.
  • the second switch subunit 4222' may further include: a second protection resistor 428'; the second protection resistor 428' is connected between the second resistor 426' and the first switch subunit 4221'.
  • FIG. 6 is a schematic diagram of another optional circuit structure of the FLYBACK module 45.
  • the following describes the control principle of the power supply control module 47 in FIG. 5 with reference to FIG. 5 and FIG. 6, taking the comparison unit as a stabilized diode as an example:
  • the main board 3 When the user sends a standby instruction to the main board 3 through a trigger device such as a remote control, the main board 3 inputs a low-level signal to STB1 in FIG. 6 according to the standby instruction.
  • the signal of STB1 in FIG. 6 is a low-level signal
  • the transistor The base voltage and emitter voltage of V915 are both zero and will not be turned on. In this way, R935 and R936 form a feedback resistor.
  • the reference source N922's 2-pin reference is 2.5V.
  • the voltage at the voltage output terminal 48 can be calculated to be 13.5V.
  • the reverse shock of the selected Zener diode The breakdown voltage is 15V, and the voltage at the voltage output terminal 48 is less than the reverse breakdown voltage of the Zener diode.
  • the first triode 423', the first resistor 424' and the first protection resistor 427' are not conducting, and the second and third The pole tube 425' is also not turned on, and the voltage output terminal 48 and the voltage input terminal 49 are cut off, and the FLYBACK module 45 will not supply power to the LLC module 46.
  • the main board 3 When the user sends a power-on instruction to the main board 3 through a trigger device such as a remote control, the main board 3 inputs a high-level signal to STB1 in Figure 6 according to the power-on instruction.
  • the signal of STB1 in Figure 6 is a high-level signal
  • the transistor V915 is turned on, so R936 and R996 are connected in parallel to form a feedback resistance with R935.
  • the reference source N922's 2-pin reference is 2.5V, assuming the resistance of R936 and R996 in parallel Is R.
  • the voltage at the voltage output terminal 48 can be calculated to be 18V, assuming that the reverse breakdown voltage of the selected Zener diode is 15V, and the voltage at the voltage output terminal 48 is greater than the reverse breakdown voltage of the Zener diode.
  • a transistor 423 ′, a first resistor 424 ′, and a first protection resistor 427 ′ are turned on, and the second transistor 425 ′ is also turned on, and the FLYBACK module 45 can supply power to the LLC module 46 normally.
  • the power board shown in FIG. 5 provides possible implementations of the switch unit, so that the display device provided in this embodiment can use the voltage change of the voltage output terminal of the FLYBACK module 45 as a control signal to control whether the LLC module 46 works, without the need to set up optocoupler isolation , which greatly simplifies the circuit.
  • Figure 7 is a sixth schematic diagram of an optional power board structure. Based on the circuit structure shown in FIG. 5, the power board shown in FIG. 7 further includes: a third switch subunit 4223'.
  • the third switch subunit 4223' is respectively connected to the second switch subunit 4222' and the voltage input terminal 49, and the conduction state of the third switch subunit 4223' is determined by the second switch Sub-unit 4222' control.
  • the third switch subunit 4223' may include: a third tertiary tube 429' and a third resistor 4210'.
  • the third resistor 4210' is connected between the second switch subunit 4222' and the ground, and the base and collector of the third tertiary transistor 429' are connected to the third resistor 4210' At both ends, the emitter of the third tertiary tube 429 ′ is connected to the voltage input terminal 49.
  • the main board 3 When the user sends a standby instruction to the main board 3 through a trigger device such as a remote control, the main board 3 inputs a low-level signal to STB1 in FIG. 6 according to the standby instruction.
  • the signal of STB1 in FIG. 6 is a low-level signal
  • the voltage value of the output terminal 48 is less than the reverse breakdown voltage of the Zener tube.
  • the first switch subunit 4221', the second switch subunit 4222', and the third switch subunit 4223' cannot be turned on.
  • the voltage output terminal 48 is connected to the voltage If the input terminals 49 are cut off, the FLYBACK module 45 will not supply power to the LLC module 46.
  • the main board 3 After the user sends a power-on instruction to the main board 3 through a trigger device such as a remote control, the main board 3 inputs a high-level signal to STB1 in Figure 6 according to the power-on instruction.
  • the signal of STB1 in Figure 6 is a high-level signal
  • the voltage The voltage value of the output terminal 48 is greater than the reverse breakdown voltage of the Zener tube.
  • the first switch subunit 4221' is turned on, so that the second switch subunit 4222' is turned on, and the third switch subunit 4223' is turned on.
  • the FLYBACK module 45 can supply power to the LLC module 46 normally.
  • a first diode and a second diode can also be provided in the power supply control module 47; the first diode is connected to the Between the second switch subunit 4222' and the third switch subunit 4223', the second diode is connected between the third switch subunit 4223' and the voltage input terminal 49.
  • a voltage regulator tube can be provided between the third triode 429' and the ground.
  • filter capacitors can also be set in the circuit.
  • the power supply control module 47 in the power board shown in FIG. 7 directly uses the voltage output by the FLYBACK module 45 as a control signal, and controls the LLC by controlling the conduction state of the first switch subunit, the second switch subunit, and the third switch subunit. Whether the module 46 is working or not, the circuit structure is simplified, the production cycle of the display device is shortened, and the potential safety hazard caused by insufficient primary and secondary isolation voltage is avoided.
  • Fig. 8 is a schematic flowchart of an alternative power supply control method.
  • the power supply control method shown in FIG. 8 corresponds to the circuit structure shown in FIG. 7.
  • the power supply control method includes:
  • the comparing unit 421' judges whether the voltage value of the voltage output terminal 48 exceeds a preset value
  • steps S802-S804 are executed.
  • the comparison unit 421' controls the first switch subunit 4221' to turn on;
  • S803 The first switch subunit 4221' controls the second switch subunit 4222' to be turned on;
  • the second switch subunit 4222' controls the third switch subunit 4223' to conduct, so that the voltage output terminal 48 and the voltage input terminal 49 are connected, and the FLYBACK module 45 can supply the LLC module 46 with normal power.
  • steps S802'-S804' are executed.
  • the comparison unit 421' controls the first switch subunit 4221' to switch off;
  • the first switch subunit 4221' controls the second switch subunit 4222' to switch off;
  • the second switch subunit 4222' controls the third switch subunit 4223' to cut off, so that the voltage output terminal 48 and the voltage input terminal 49 are isolated, and the FLYBACK module 45 cannot supply the LLC module 46 with normal power.
  • control method shown in FIG. 8 directly uses the voltage value of the voltage output terminal 48 of the FLYBACK module 45 as a control signal to control the conduction state between the voltage output terminal 48 and the voltage input terminal 49, thereby controlling whether the FLYBACK module 45 Power is supplied to the LLC module 46. It can be seen from the above that the voltage output terminal 48 and the voltage input terminal 49 are both connected to the primary of the transformer. Therefore, the power supply control method does not need to involve the control of the optocoupler, and the control process is simple and easy to implement.

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Abstract

一种显示装置及供电控制方法，所述显示装置包括：电源板（4），所述电源板（4）上设置有：第一电源模块、第二电源模块和供电控制模块（47）；其中，所述供电控制模块（47）分别与所述第一电源模块的电压输出端以及所述第二电源模块的电压输入端连接，所述电压输出端连接在所述第一电源模块中变压器的初级端，所述电压输入端连接在所述第二电源模块中变压器的初级端；所述供电控制模块（47）用于根据所述电压输出端的电压值，控制所述第一电源模块是否给所述第二电源模块供电。所述显示装置，简化了电路结构，缩短了显示装置的生产周期，同时避免了由于初次级隔耐压不足造成安全隐患。

Description

显示装置及供电控制方法
本申请要求在2019年3月12日提交中国专利局、申请号为201910183088.8、发明名称为“显示装置及供电控制方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及自动控制技术，尤其涉及一种显示装置及供电控制方法。
背景技术
随着人们获取信息的需求不断加深，各种类型的显示装置应运而生，比如电脑、电视机以及投影仪等。电源电路是显示装置中最为重要的电路结构之一，电源电路可以为显示装置提供电能，从而使显示装置得以正常运行。有的显示装置设置有独立电源板，有的显示装置将电源板和主板合二为一。通常，显示装置的供电电路接入交流电，然后对所接入的交流电进行处理转换成能够为负载使用的直流电，该处理就会用到变压器。
在电子产品的使用中，为了确保用户的用电安全，通常需要使用变压器将强电转换为弱电，变压器上连接强电的一端称为初级端，连接弱电的一端称为次级端。为了使用户能够通过次级端来控制初级端电路的工作状态，需要在次级端和初级端之间设置光耦隔离，以通过该光耦隔离传输用户的控制信号。因此，现有供电电路可能存在如下问题：包含的元器件较多，电路复杂度高；光耦器件需要做电磁兼容性EMC检测，增加了产品的生产周期；光耦失效时，可能由于初次级隔耐压不足造成安全隐患。
发明内容
本申请提供一种显示装置，用以解决现有显示装置中供电控制模块电路复杂度高的问题。
一方面，本申请提供一种显示装置，包括：
电源板，所述电源板上设置有：
第一电源模块、第二电源模块和供电控制模块；
其中，所述供电控制模块分别与所述第一电源模块的电压输出端以及所述第二电源模块的电压输入端连接，所述电压输出端连接在所述第一电源模块中变压器的初级端，所述电压输入端连接在所述第二电源模块中变压器的初级端；
所述供电控制模块用于根据所述电压输出端的电压值，控制所述第一电源模块是否给所述第二电源模块供电。
可选的，所述供电控制模块，包括：
比较单元和开关单元；
其中，所述比较单元分别与所述开关单元以及所述电压输出端连接，所述开关单元分别与所述电压输出端、所述电压输入端以及地连接；
所述比较单元用于根据所述电压输出端的电压值，通过控制所述开关单元的导通状态 来控制所述第一电源模块是否给所述第二电源模块供电。
可选的，所述开关单元，包括：
第一开关子单元和第二开关子单元；
其中，所述第一开关子单元分别与所述比较单元、所述第二开关子单元以及地连接，所述第二开关子单元分别与所述电压输出端以及所述电压输入端连接，所述第一开关子单元的导通状态由所述比较单元控制，所述第二开关子单元的导通状态由所述第一开关子单元控制。
可选的，所述第一开关子单元，包括：
第一三级管和第一电阻；
其中，所述第一电阻连接在所述比较单元和地之间，所述第一三极管的发射极和基极连接在所述第一电阻的两端，所述第一三极管的集电极和所述第二开关子单元连接。
可选的，所述第一开关子单元，还包括：
第一保护电阻；
所述第一保护电阻连接在所述第一电阻和所述比较单元之间。
可选的，所述第二开关子单元，包括：
第二三级管和第二电阻；
其中，所述第二电阻连接在所述电压输出端和所述第一开关子单元之间，所述第二三极管的发射极和基极连接在所述第二电阻的两端，所述第二三极管的集电极和所述电压输入端连接。
可选的，所述第二开关子单元，还包括：
第二保护电阻；
所述第二保护电阻连接在所述第二电阻和所述第一开关子单元之间。
可选的，所述第一电源模块为反激式开关FLYBACK电源模块，所述第二电源模块为谐振转换LLC电源模块，所述比较单元为稳压二极管。
可选的，所述开关单元，还包括：
第三开关子单元；
所述第三开关子单元分别与所述第二开关子单元以及所述电压输入端连接，所述第三开关子单元的导通状态由所述第二开关子单元控制。
可选的，所述第三开关子单元，包括：
第三三级管和第三电阻；
其中，所述第三电阻连接在所述第二开关子单元和地之间，所述第三三级管的基极和集电极连接在所述第三电阻的两端，所述第三三级管的发射极和所述电压输入端连接。
另一方面，本申请还提供一种供电控制方法，所述供电控制模块判断所述电压输出端的电压值是否超过预设值；若是，则所述供电控制模块控制所述第一电源模块给所述第二电源模块供电；若否，则所述供电控制模块控制所述第一电源模块不给所述第二电源模块供电。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对实施例描述中所需要使用的附 图作一简单地介绍，显而易见地，下面描述中的附图是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1a为设有独立电源板的显示装置的结构示意图；
图1b为电源板与负载的连接关系示意图；
图1c为一种可选的电源板结构示意图一；
图1d为FLYBACK模块的一种可选的电路结构示意图；
图1e为LLC模块的一种可选的电路结构示意图；
图1f为供电控制模块的一种可选的电路结构示意图；
图2为一种可选的电源板结构示意图二；
图3为一种可选的电源板结构示意图三；
图4为一种可选的电源板结构示意图四；
图5为一种可选的电源板结构示意图五；
图6为FLYBACK模块的另一种可选的电路结构示意图；
图7为一种可选的电源板结构示意图六；
图8为一种可选的供电控制方法的流程示意图。
附图标记说明：
1：面板；
2：背光组件；
20：背板；
3：主板；
4：电源板；
5：后壳；
6：基座；
7：负载；
41：电源板4输入端；
42：电源板4输出端；
421：电源板4第一输出端；
422：电源板4第二输出端；
423：电源板4第三输出端；
71：灯条；
72：音响；
43：整流模块；
44：PFC模块；
45：FLYBACK模块；
46：LLC模块；
47：供电控制模块；
450：FLYBACK模块45的变压器；
451：变压器450初级端；
452：变压器450次级端；
453：FLYBACK模块45的电源芯片控制电路模块；
454：FLYBACK模块45的MOS管驱动电路模块；
455：供电模块；
456：FLYBACK模块45的次级整流电路模块；
48：FLYBACK模块45的电压输出端；
49：LLC模块46的电压输入端；
460：LLC模块46的变压器；
461：变压器460初级端；
462：变压器460次级端；
463：LLC模块46的电源芯片控制电路模块；
464：LLC模块46的MOS管驱动电路模块；
466：LLC模块46的次级整流电路模块；
31：控制信号输入端；
421’：比较单元；
422’：开关单元；
4221’：第一开关子单元；
4222’：第二开关子单元；
423’：第一三极管；
424’：第一电阻；
425’：第二三极管；
426’：第二电阻；
427’：第一保护电阻；
428’：第二保护电阻；
4223’：第三开关子单元；
429’：第三三极管；
4210’：第三电阻。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，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，都属于本申请保护的范围。
本发明本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”“第四”等(如果存在)是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的本申请的实施例例如能够以除了在这里图示或描述的那些以外的顺序实施。
此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有 的其它步骤或单元。
以设置有独立电源板的显示装置为例，对显示装置的结构进行说明，参见图1a所示，图1a为设有独立电源板的显示装置的结构示意图，如图1a所示，显示装置包括面板1、背光组件2、主板3、电源板4、后壳5和基座6。其中，面板1用于给用户呈现画面；背光组件2位于面板1的下方，通常是一些光学组件，用于供应充足的亮度与分布均匀的光源，使面板1能正常显示影像，背光组件2还包括背板20，主板3和电源板4设置于背板20上，通常在背板20上冲压形成一些凸包结构，主板3和电源板4通过螺钉或者挂钩固定在凸包上；后壳5盖设在面板1上，以隐藏背光组件2、主板3以及电源板4等显示装置的零部件，起到美观的效果；底座6，用于支撑显示装置。
进一步的，图1b为电源板与负载7的连接关系示意图，如图1b所示，电源板4包括输入端41和输出端42(图中示出第一输出端421、第二输出端422、第三输出端423)，其中，输入端41与市电相连，输出端42与负载7相连，比如，第一输出端421和灯条71相连，第二输出端422和音响72相连，第三输出端423和主板3相连。电源板4需要将交流市电转换为负载所需求的直流电，并且，该直流电通常具有不同的规格，例如音响需要18V，面板需要12V等。
图1c为一种可选的电源板结构示意图一，图1c所示电源板上设置有：整流模块43、功率因数校正(Power Factor Correction，PFC)模块44、反激式开关(Flyback Transformer，FLYBACK)模块45、谐振变换器(Resonant Converters，LLC)模块46和供电控制模块47，其中，整流模块43、FLYBACK模块45和LLC模块46均与PFC模块44连接，FLYBACK模块45和LLC模块46通过供电控制模块47连接。
其中，整流模块43的作用为将市电提供的交流电进行整流转换为直流电，并输出至PFC模块44中，在PFC模块44之前可以连接有电磁干扰(Electromagnetic Interference，EMI)滤波器(图1c未示出)，对输入的交流电源进行高频滤波。
PFC模块44一般包括PFC电感、开关功率器件和PFC控制芯片，其作用是对输入的交流电源进行功率因数校正，通过对整流模块43输出的直流电做升压处理以得到稳定的直流母线电压(如380V)，并输出至FLYBACK模块45和LLC模块46中，PFC模块44可以有效提高电源的功率因数，保证电压和电流同相位。
FLYBACK模块45分别与主板3和音响72等负载连接，用于向这些元器件供电，另外，FLYBACK模块还用于向PFC模块44和LLC模块46提供自身的供电电压和待机电源。
LLC模块46和灯条71连接，LLC模块46可以采用双MOS管，通常同步整流电路设置在LLC模块46中，同步整流电路主要可以包括变压器、控制器、两个MOS管以及二极管。另外，LLC模块46还可以包括脉冲频率调整(Pulse frequency modulation，PFM)电路、电容以及电感等元器件。LLC模块46具体可以对PFC模块44输入的直流母线电压进行降压或升压，并输出恒定的电压给负载7(例如灯条71)。通常，LLC模块46能够输出多种不同的电压，以满足负载的需求。
上述供电控制模块47的工作原理为：当显示装置接收到开机指令时，供电控制模块47控制FLYBACK模块45给LLC模块46正常供电，使得显示装置可以正常显示影像；当显示装置接收到待机指令时，供电控制模块47控制FLYBACK模块45不给LLC模块46供电，使LLC模块46在待机状态下不工作，从而降低了显示装置的待机功耗。
供电控制模块47在上述控制过程中，直接将用户在变压器次级端触发的信号作为控制信号，来控制FLYBACK模块45是否给LLC模块46供电，然而，FLYBACK模块45的电压输出端和LLC模块46的电压输入端均连接在变压器的初级端，上述控制方法会导致供电控制模块47的电路复杂度高。
如图1c所示，图1c为一种可选的电源板结构示意图，由上文可知，图1c所示电源板包括的模块有：FLYBACK模块45、LLC模块46和供电控制模块47。
参见图1d所示，图1d为FLYBACK模块45的一种可选的电路结构示意图，FLYBACK模块45中设置有变压器450，变压器450包括初级端451和次级端452。
初级端451和电源芯片控制电路模块453、MOS管驱动电路模块454、供电模块455连接，电源芯片控制电路模块453用于通过对初级电压采样、电流采样以及次级输出电压反馈信号的处理，输出合理的脉冲宽度调制(Pulse Width Modulation，PWM)控制信号，以控制MOS管驱动电路模块454的开关。MOS管驱动电路模块454通过自身的开闭产生变化的电压和电流，通过变压器450，把能量传输给次级。供电模块455用于输出稳定的电压，给FLYBACK和LLC控制芯片供电。
次级端452和次级整流电路模块456连接，次级整流电路模块456用于通过整流二极管和输出电解，把矩形波变为稳定的直流输出。
FLYBACK模块45的电压输出端48连接在供电模块455上，主板3控制信号输入端31连接在次级整流电路模块456上。
参见图1e所示，图1e为LLC模块46的一种可选的电路结构示意图，LLC模块46中设置有变压器460，变压器460包括初级端461和次级端462。
初级端461和电源芯片控制电路模块463以及MOS管驱动电路模块464，电源芯片控制电路模块463用于通过对初级电压采样、电流采样以及次级输出电压反馈信号的处理，输出合理的脉冲宽度调制(Pulse Width Modulation，PWM)控制信号，以控制MOS管驱动电路模块464的开关。MOS管驱动电路模块464通过自身的开闭产生变化的电压和电流，通过变压器460，把能量传输给次级。
次级端462和次级整流电路模块466连接，次级整流电路模块466用于通过整流二极管和输出电解，把矩形波变为稳定的直流输出。
LLC模块46的电压输入端49连接在电源芯片控制电路模块463上。
参见图1f所示，图1f为供电控制模块47的一种可选的电路结构示意图一。如图1f所示，供电控制模块47具体控制过程为：
当用户通过遥控器等触发设备向主板3发送开机指令后，主板3根据该开机指令向控制信号输入端31输入高电平信号，三极管V905导通，光耦N851发光端1、2脚导通，光耦开始工作，V904导通，使得FLYBACK模块45的电压输出端48和LLC模块46的电压输入端49之间连通，从而FLYBACK模块45给LLC模块46正常供电，LLC模块46的负载(灯条71)开启，用户可正常观看影像。
当用户通过遥控器等触发设备向主板3发送待机指令后，主板3根据该待机指令向控制信号输入端31输入低电平信号，三极管V905不导通，光耦N851的发光端1、2脚不导通，光耦不工作，因此V904也不会导通，使得FLYBACK模块45的电压输出端48和LLC 模块46的电压输入端49之间被隔断，从而FLYBACK模块45无法给LLC模块46正常供电，LLC模块46的负载(灯条71)关闭，显示装置被切换至待机状态。
综合图1d和图1e可知，控制信号输入端31连接在变压器450的次级端，而电压输出端48连接在变压器450的初级端，电压输入端49连接在变压器460的初级端。如图1f所示，供电控制模块47直接使用控制信号输入端31的信号作为控制信号来控制FLYBACK模块45是否给LLC模块46供电时，为了隔离变压器初级端的高压危险以及实现控制信号的传输，需要在供电控制模块47中设置光耦隔离N851。
如图2所示，图2为一种可选的电源板结构示意图二。在图2所示电源板4上设置有：FLYBACK模块45、LLC模块46和供电控制模块47；其中，供电控制模块47分别与所述FLYBACK模块45的电压输出端48以及所述LLC模块46的电压输入端49连接，所述电压输出端48连接在所述FLYBACK模块45中变压器450的初级端451，所述电压输入端49连接在所述LLC模块46中变压器460的初级端461。
上述供电控制模块47用于根据所述电压输出端48的电压值，控制所述FLYBACK模块45是否给所述LLC模块46供电。
如图3所示，图3为一种可选的电源板结构示意图三，如图3所示，供电控制模块47可包括：比较单元421′和开关单元422′。
其中，所述比较单元421′分别与所述开关单元422′以及所述电压输出端48连接，所述开关单元422′分别与所述电压输出端48、所述电压输入端49以及地连接。所述比较单元421′用于根据所述电压输出端48的电压值，通过控制所述开关单元422′的导通状态来控制所述FLYBACK模块45是否给所述LLC模块46供电。
图3所示供电控制模块47的控制原理为：
当用户通过遥控器等触发设备向主板3发送待机指令后，主板3根据该待机指令向FLYBACK模块45输入低电平信号，FLYBACK模块45接收到该低电平信号后，控制电压输出端48输出的电压值小于预设值，比较单元421′在电压输出端48输出的电压值小于电压预设值的情况下，控制开关单元422′切断，在开关单元422′被切断的情况下，电压输出端48和电压输入端49之间不能导通，FLYBACK模块45便不会给所述LLC模块46供电。
当用户通过遥控器等触发设备向主板3发送开机指令后，主板3根据该开机指令向FLYBACK模块45输入高电平信号，FLYBACK模块45接收到该高电平信号后，控制电压输出端48输出的电压值大于预设值，比较单元421′在电压输出端48输出的电压值大于电压预设值的情况下，控制开关单元422′导通，进而使电压输出端48和电压输入端49之间导通，FLYBACK模块45开始给所述LLC模块46供电。
需要说明的是：用户向主板3发送的指令和电平信号的对应关系不限于上述对应关系，也可以是待机指令对应高电平信号，开机指令对应低电平信号。
可选的，比较单元421′可以为稳压二极管，上述电压预设值为该稳压二极管的反向击穿电压值。
图3所示电源板中，供电控制模块47直接以FLYBACK模块45的电压输出端48的电压变化为控制信号来控制是否向LLC模块46供电，简化了电路结构，缩短了显示装置的生产周期，同时避免了由于初次级隔耐压不足造成安全隐患。
如图4所示，图4为一种可选的电源板结构示意图四，在图3所示电路结构基础上， 图4所示电源板中，所述开关单元422′，包括：第一开关子单元4221′和第二开关子单元4222′。
其中，所述第一开关子单元4221′分别与所述比较单元421′、所述第二开关子单元4222′以及地连接，所述第二开关子单元4222′分别与所述电压输出端48以及所述电压输入端49连接，所述第一开关子单元4221′的导通状态由所述比较单元421′控制，所述第二开关子单元4222′的导通状态由所述第一开关子单元4221′控制。
图4所示供电控制模块47的控制原理为：
当用户通过遥控器等触发设备向主板3发送待机指令后，主板3根据该待机指令向FLYBACK模块45输入低电平信号，FLYBACK模块45接收到该低电平信号后，控制电压输出端48输出的电压值小于预设值，比较单元421′在电压输出端48输出的电压值小于电压预设值的情况下，控制第一开关子单元4221′切断，第一开关子单元4221′切断进一步控制第二开关子单元4222′切断，电压输出端48和电压输入端49之间不能导通，FLYBACK模块45便不会给所述LLC模块46供电。
当用户通过遥控器等触发设备向主板3发送开机指令后，主板3根据该开机指令向FLYBACK模块45输入高电平信号，FLYBACK模块45接收到该高电平信号后，控制电压输出端48输出的电压值大于预设值，比较单元421′在电压输出端48输出的电压值大于电压预设值的情况下，控制第一开关子单元4221′导通，第一开关子单元4221′切断进一步控制第二开关子单元4222′导通，进而使电压输出端48和电压输入端49之间导通，FLYBACK模块45开始给所述LLC模块46供电。
如图5所示，图5为一种可选的电源板结构示意图五，第一开关子单元4221′可以包括：
第一三级管423′和第一电阻424′；所述第一电阻424′连接在所述比较单元421′和地之间，所述第一三极管423′的发射极和基极连接在所述第一电阻424′的两端，所述第一三极管423′的集电极和所述第二开关子单元4222′连接。所述第二开关子单元4222′可以包括：第二三级管425′和第二电阻426′；所述第二电阻426′连接在所述电压输出端48和所述第一开关子单元4221′之间，所述第二三极管425′的发射极和基极连接在所述第二电阻426′的两端，所述第二三极管425′的集电极和所述电压输入端49连接。
可选的，第一开关子单元4221′还可以包括：第一保护电阻427′；所述第一保护电阻427′连接在所述第一电阻424′和所述比较单元421′之间。第二开关子单元4222′还可以包括：第二保护电阻428′；所述第二保护电阻428′连接在所述第二电阻426′和所述第一开关子单元4221′之间。
图6为FLYBACK模块45的另一种可选的电路结构示意图。下面结合图5和图6，以比较单元为稳压二级管为例对图5中供电控制模块47的控制原理进行说明：
当用户通过遥控器等触发设备向主板3发送待机指令后，主板3根据该待机指令向图6中的STB1输入低电平信号，图6中STB1的信号为低电平信号的情况下，三极管V915的基级电压和发射极电压都为零，不会导通，这样R935和R936构成反馈电阻，基准源N922的2脚基准为2.5V，此时，LYBACK模块45原始输出电压为(R936/2.5)*(R936+R935)＝9V。假设电压输出端48绕组圈数和LYBACK模块45原始输出绕组圈数匝数比为6:4，此时，可计算得到电压输出端48电压为13.5V，假设选用的稳压二极管的反向击穿电压为15V，电 压输出端48电压小于稳压二极管的反向击穿电压，此时第一三极管423′、第一电阻424′和第一保护电阻427′不导通，第二三极管425′也不导通，电压输出端48和电压输入端49之间被隔断，FLYBACK模块45便不会给所述LLC模块46供电。
当用户通过遥控器等触发设备向主板3发送开机指令后，主板3根据该开机指令向图6中的STB1输入高电平信号，图6中STB1的信号为高电平信号的情况下，三极管V915的基级电压比发射极电压高0.7V左右，三极管V915导通，这样R936和R996并联后和R935构成反馈电阻，基准源N922的2脚基准为2.5V，假设R936和R996并联后的电阻为R,此时，LYBACK模块45原始输出电压为(R/2.5)*(R+R935)＝12V，假设电压输出端48绕组圈数和LYBACK模块45原始输出绕组圈数匝数比为6:4，此时，可计算得到电压输出端48电压为18V，假设选用的稳压二极管的反向击穿电压为15V，电压输出端48电压大于稳压二极管的反向击穿电压，此时第一三极管423′、第一电阻424′和第一保护电阻427′导通，第二三极管425′也导通，FLYBACK模块45便可给所述LLC模块46正常供电。
图5所示电源板提供了开关单元可能的实现方式，使得本实施例提供的显示装置能够以FLYBACK模块45的电压输出端的电压变化为控制信号来控制LLC模块46是否工作，无需设置光耦隔离，极大地简化了电路。
如图7所示，图7为一种可选的电源板结构示意图六。在图5所示电路结构基础上，图7所示电源板中，还包括：第三开关子单元4223′。
其中，所述第三开关子单元4223′分别与所述第二开关子单元4222′以及所述电压输入端49连接，所述第三开关子单元4223′的导通状态由所述第二开关子单元4222′控制。
可选的，第三开关子单元4223′可以包括：第三三级管429′和第三电阻4210′。
其中，所述第三电阻4210′连接在所述第二开关子单元4222′和地之间，所述第三三级管429′的基极和集电极连接在所述第三电阻4210′的两端，所述第三三级管429′的发射极和所述电压输入端49连接。
下面对图7所示供电控制模块47的控制原理进行说明：
当用户通过遥控器等触发设备向主板3发送待机指令后，主板3根据该待机指令向图6中的STB1输入低电平信号，图6中STB1的信号为低电平信号的情况下，电压输出端48的电压值小于稳压管的反向击穿电压，第一开关子单元4221′、第二开关子单元4222′和第三开关子单元4223′不能导通，电压输出端48和电压输入端49之间被隔断，FLYBACK模块45便不会给所述第LLC模块46供电。
当用户通过遥控器等触发设备向主板3发送开机指令后，主板3根据该开机指令向图6中的STB1输入高电平信号，图6中STB1的信号为高电平信号的情况下，电压输出端48的电压值大于稳压管的反向击穿电压，第一开关子单元4221′被导通，使得第二开关子单元4222′被导通，进而使第三开关子单元4223′被导通，FLYBACK模块45便可给所述LLC模块46正常供电。
为了确保电压输出端48和电压输入端49之间为单向导通，还可在供电控制模块47中设置第一二极管和第二二极管；所述第一二极管连接在所述第二开关子单元4222′和第三开关子单元4223′之间，所述第二二极管连接在所述第三开关子单元4223′和所述电压输入端49之间。
为了稳定第三三极管429′的基极的电压，可在第三三级管429′和地之间设置稳压管。 为了过滤电路中的干扰，还可在电路中设置滤波电容等。
图7所示电源板中的供电控制模块47直接以FLYBACK模块45输出的电压为控制信号，通过控制第一开关子单元、第二开关子单元和第三开关子单元的导通状态来控制LLC模块46是否工作，简化了电路结构，缩短了显示装置的生产周期，同时避免了由于初次级隔耐压不足造成安全隐患。
图8为一种可选的供电控制方法的流程示意图。图8所示供电控制方法和图7所示电路结构对应，该供电控制方法，包括：
S801、比较单元421′判断电压输出端48的电压值是否超过预设值；
若电压输出端48的电压值超过预设值，则执行步骤S802-S804。
S802、比较单元421′控制第一开关子单元4221′导通；
S803、第一开关子单元4221′控制第二开关子单元4222′导通；
S804、第二开关子单元4222′控制第三开关子单元4223′导通，从而使电压输出端48和电压输入端49之间导通，FLYBACK模块45可以给LLC模块46正常供电。
若电压输出端48的电压值未超过预设值，则执行步骤S802′-S804′。
S802′、比较单元421′控制第一开关子单元4221′切断；
S803′、第一开关子单元4221′控制第二开关子单元4222′切断；
S804′、第二开关子单元4222′控制第三开关子单元4223′切断，从而使电压输出端48和电压输入端49之间被隔断，FLYBACK模块45无法给LLC模块46正常供电。
可见，图8所示控制方法是直接以FLYBACK模块45的电压输出端48的电压值为控制信号，来控制电压输出端48和电压输入端49之间的导通状态，进而控制FLYBACK模块45是否给LLC模块46供电。由上文可知，电压输出端48和电压输入端49均连接在变压器的初级，因此，该供电控制方法无需涉及对光耦的控制，控制过程简单易实现。
最后应说明的是：以上各实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述各实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分或者全部技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围。

Claims (10)

  1. 一种显示装置，包括：电源板，所述电源板上设置有：
    第一电源模块、第二电源模块和供电控制模块；
    其中，所述供电控制模块分别与所述第一电源模块的电压输出端以及所述第二电源模块的电压输入端连接，所述电压输出端连接在所述第一电源模块中变压器的初级端，所述电压输入端连接在所述第二电源模块中变压器的初级端；
    所述供电控制模块用于根据所述电压输出端的电压值，控制所述第一电源模块是否给所述第二电源模块供电。
  2. 根据权利要求1所述的显示装置，其中，所述供电控制模块，包括：
    比较单元和开关单元；
    其中，所述比较单元分别与所述开关单元以及所述电压输出端连接，所述开关单元分别与所述电压输出端、所述电压输入端以及地连接；
    所述比较单元用于根据所述电压输出端的电压值，通过控制所述开关单元的导通状态来控制所述第一电源模块是否给所述第二电源模块供电。
  3. 根据权利要求2所述的显示装置，其中，所述开关单元，包括：
    第一开关子单元和第二开关子单元；
    其中，所述第一开关子单元分别与所述比较单元、所述第二开关子单元以及地连接，所述第二开关子单元分别与所述电压输出端以及所述电压输入端连接，所述第一开关子单元的导通状态由所述比较单元控制，所述第二开关子单元的导通状态由所述第一开关子单元控制。
  4. 根据权利要求3所述的显示装置，其中，所述第一开关子单元，包括：
    第一三级管和第一电阻；
    其中，所述第一电阻连接在所述比较单元和地之间，所述第一三极管的发射极和基极连接在所述第一电阻的两端，所述第一三极管的集电极和所述第二开关子单元连接。
  5. 根据权利要求4所述的显示装置，其中，所述第一开关子单元，还包括：
    第一保护电阻；
    所述第一保护电阻连接在所述第一电阻和所述比较单元之间。
  6. 根据权利要求3所述的显示装置，其中，所述第二开关子单元，包括：
    第二三级管和第二电阻；
    其中，所述第二电阻连接在所述电压输出端和所述第一开关子单元之间，所述第二三极管的发射极和基极连接在所述第二电阻的两端，所述第二三极管的集电极和所述电压输入端连接。
  7. 根据权利要求6所述的显示装置，其中，所述第二开关子单元，还包括：
    第二保护电阻；
    所述第二保护电阻连接在所述第二电阻和所述第一开关子单元之间。
  8. 根据权利要求1-7任一项所述的显示装置，其中，
    所述第一电源模块为反激式开关FLYBACK电源模块，所述第二电源模块为谐振转换LLC电源模块，所述比较单元为稳压二极管。
  9. 根据权利要求3-7任一项所述的显示装置，其中，所述开关单元，还包括：
    第三开关子单元；
    所述第三开关子单元分别与所述第二开关子单元以及所述电压输入端连接，所述第三开关子单元的导通状态由所述第二开关子单元控制。
  10. 一种供电控制方法，应用于权利要求1-9任一项所述的显示装置，包括：
    所述供电控制模块判断所述电压输出端的电压值是否超过预设值；
    若是，则所述供电控制模块控制所述第一电源模块给所述第二电源模块供电；
    若否，则所述供电控制模块控制所述第一电源模块不给所述第二电源模块供电。
PCT/CN2019/120047 2019-03-12 2019-11-21 显示装置及供电控制方法 WO2020181830A1 (zh)

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