WO2019232669A1 - 背光控制电路、方法及终端设备 - Google Patents

背光控制电路、方法及终端设备 Download PDF

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Publication number
WO2019232669A1
WO2019232669A1 PCT/CN2018/089768 CN2018089768W WO2019232669A1 WO 2019232669 A1 WO2019232669 A1 WO 2019232669A1 CN 2018089768 W CN2018089768 W CN 2018089768W WO 2019232669 A1 WO2019232669 A1 WO 2019232669A1
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Prior art keywords
circuit
voltage
terminal
switch
charging
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Application number
PCT/CN2018/089768
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English (en)
French (fr)
Inventor
姜武爽
杨永祥
罗艳彪
Original Assignee
华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201880093519.5A priority Critical patent/CN112119560A/zh
Priority to PCT/CN2018/089768 priority patent/WO2019232669A1/zh
Publication of WO2019232669A1 publication Critical patent/WO2019232669A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Definitions

  • the present application relates to the technical field of terminal equipment, and in particular, to a backlight control circuit, method, and terminal equipment.
  • the mobile terminal may use the mobile terminal to process other services during the charging process of the mobile terminal.
  • the power consumption of the display screen accounts for more than 60% of the total power consumption of the mobile phone system, and 90% of the power consumption of the display screen is mainly used for backlight display.
  • the phone is slow to charge.
  • the display may be a liquid crystal display (Liquid Crystal Display, LCD), an organic light emitting diode (Organic Light-Emitting Diode, OLED) display, or another type of display.
  • the conversion efficiency of the backlight power supply is usually improved to achieve the purpose of improving the charging efficiency of the mobile phone.
  • improving the conversion efficiency of backlight power it is achieved by replacing high-efficiency backlight integrated circuits (ICs), but the price of high-efficiency backlight ICs is higher, which will increase the cost of mobile phones, resulting in higher mobile phone costs .
  • the present application provides a backlight control circuit, method and terminal device to improve the conversion efficiency of the backlight power of the terminal device.
  • an embodiment of the present application provides a backlight control circuit.
  • the backlight control circuit may include:
  • a charging circuit a first switching circuit, a first adjusting circuit, and a processor; wherein the charging circuit includes a second adjusting circuit;
  • the input terminal of the charging circuit is connected to the output terminal of the power supply, the input / output terminal of the charging circuit is connected to the battery, the preset terminal of the charging circuit is connected to the first terminal of the first switching circuit, and the second terminal of the first switching circuit Connected to the processor, the third end of the first switching circuit is connected to the input end of the first adjustment circuit, and the output end of the first adjustment circuit is connected to the backlight module of the terminal device;
  • the charging circuit is used for receiving the first voltage input from the power source, and inputting the second voltage obtained by the conversion process to the battery;
  • the charging circuit is further configured to input a preset voltage to the first switch circuit through a preset terminal, where the preset voltage is a voltage that has not been adjusted by the second adjustment circuit of the charging circuit;
  • the processor is configured to control the first switch circuit to be turned on when a voltage is detected at the input terminal of the charging circuit
  • the first adjustment circuit is used to adjust a preset voltage according to the voltage of the backlight module when the first switch circuit is turned on, and input the third voltage obtained by the adjustment to the backlight module to control the backlight module by the third voltage. Display brightness.
  • the backlight control circuit provided in the embodiment of the present application provides a voltage to the charging circuit through a power source
  • the first voltage at the input end of the charging circuit first passes the first current-limiting circuit to limit the current, and divides the current-limited voltage into the Part of the voltage is input to the battery through the second MOS tube to charge the battery.
  • another part of the voltage after the current limitation passes through the first MOS tube and passes between the first MOS tube and the second adjustment circuit. The first output end of the input is input to the first switching circuit.
  • the processor When the processor detects a voltage at the input end of the charging circuit, the processor controls the first switching circuit to be turned on, so that when the first switching circuit is turned on, according to the backlight,
  • the voltage of the module is adjusted to a preset voltage, and the adjusted third voltage is input to the backlight module to control the display brightness of the backlight module through the third voltage, so as to provide the required voltage to the backlight module, so that the terminal device
  • the first voltage only passes through the first A full power conversion circuit, thereby increasing the conversion efficiency of the mobile phone backlight power.
  • the charging circuit further includes a first current limiting circuit, a first MOS tube, a control sub-circuit, and a second MOS tube;
  • the input terminal of the first current limiting circuit is connected to the output terminal of the power supply.
  • the output terminal of the first current limiting circuit is connected to the first terminal of the first MOS tube and the first terminal of the control sub-circuit, respectively.
  • the second end of the second adjustment circuit is connected to the second end of the control submodule and the first end of the second MOS tube, and the second end of the second MOS tube is connected to the battery connection.
  • the preset terminal is the first output terminal of the charging circuit, and the second terminal of the MOS tube and the first terminal of the second adjustment circuit are respectively connected to the first switch circuit through the first output terminal.
  • the preset terminal is an input terminal of the charging circuit.
  • the backlight control circuit may further include a second current limiting circuit
  • the input terminal of the second current limiting circuit is connected to the input terminal of the charging circuit, and the output terminal of the second current limiting circuit is connected to the first terminal of the first switching circuit;
  • the second current-limiting circuit is used to receive the first voltage input by the power supply, and perform current-limiting processing on the first voltage to obtain a preset voltage, thereby preventing the charger from burning out due to excessive current, and implementing current-limit control of the preset voltage. .
  • the first switch circuit is a switch circuit with a current limiting control function
  • the first switch circuit is further configured to detect a preset voltage at the first end of the first switch circuit, and if the preset voltage at the first end of the first switch circuit is less than a preset threshold, send a closing request signal to the processor;
  • the processor is further configured to control the first switch circuit to be turned on according to the closing request signal.
  • the first switch circuit is further configured to send an interrupt request signal to the processor if the preset voltage at the first end of the first switch circuit is greater than a preset threshold;
  • the processor is further configured to control the first switch circuit to be turned off according to the interrupt request signal until the processor cannot receive the interrupt request signal.
  • the first switch circuit is further configured to send an interrupt request signal to the processor if the preset voltage at the first end of the first switch circuit is greater than a preset threshold;
  • the processor is further configured to reduce the brightness of the backlight module according to the interrupt request signal until the processor cannot receive the interrupt request signal.
  • the backlight control circuit may further include a second switch circuit and a switch control circuit
  • the first terminal of the second switching circuit is connected to the second output terminal of the charging circuit, the second terminal of the second switching circuit is connected to the processor, and the third terminal of the second switching circuit is connected to the input terminal of the first adjustment circuit. ;
  • the input terminal of the switch control circuit is connected to the processor, and the output terminal of the switch control circuit is connected to the third terminal of the first switch circuit;
  • the processor is further configured to control the second switch circuit to be turned on when it detects that there is no voltage at the input end of the charging circuit and there is a voltage in the charging circuit, and to control the first switch circuit to be turned off by the switch control circuit, which can avoid mis-switching.
  • the switch control circuit can be used to control the first switch circuit to be turned off and the second switch circuit to be turned on to
  • the required voltage is input to the backlight module through the first adjustment circuit, and the display brightness of the backlight module is controlled by the input voltage, so as to provide the required voltage to the backlight module while charging, To control the display brightness of the backlight module.
  • the switch control circuit may include a first resistor, a second resistor, and a diode
  • One end of the first resistor is connected to the output end of the diode, one end of the second resistor is connected to the input end of the diode, the other end of the second resistor is connected to the processor, and the input end of the diode is also connected to the third end of the first switching circuit. ⁇ ⁇ End connection.
  • the second current limiting circuit may include an overcurrent detection circuit, an overtemperature detection circuit, an AND gate, and an abnormal state output circuit;
  • the first terminal of the overcurrent detection circuit and the first terminal of the overtemperature detection circuit are both connected to the input terminal of the charging circuit, and the second terminal of the overcurrent detection circuit is connected to the first terminal of the AND gate.
  • the second end is connected to the second end of the AND gate, the third end of the AND gate is connected to the first end of the abnormal state output circuit, and the second end of the abnormal state output circuit is connected to the first end of the first switch circuit.
  • the first adjustment circuit when the second adjustment circuit is a step-down circuit, the first adjustment circuit is a step-up circuit; or when the second conditioning telephone is a step-up circuit, the first adjustment circuit is a step-down circuit. .
  • the first output end is any one of a power midpoint PMID, a midpoint MID, a USB midpoint USB_MID, a charging power midpoint CHG_VMID, and a power midpoint VMID.
  • the second switching circuit is a switching circuit with a current limiting control function.
  • the first switching circuit is any one of a MOS transistor, a transistor, a transistor, and a load switch.
  • an embodiment of the present application further provides a backlight control method, which is applied to a backlight control circuit.
  • the backlight control circuit includes a charging circuit, a first switch circuit, a first adjustment circuit, and a processor.
  • the charging circuit includes a second adjustment. Circuit, the backlight control method may include:
  • the charging circuit receives the first voltage input from the power source and inputs the second voltage obtained by the conversion process to the battery;
  • the charging circuit inputs a preset voltage to the first switching circuit through a preset terminal of the charging circuit, and the preset voltage is a voltage that has not been adjusted by the second adjustment circuit of the charging circuit;
  • the processor When the processor detects a voltage at the input terminal of the charging circuit, the processor controls the first switch circuit to be turned on;
  • the first adjustment circuit adjusts a preset voltage according to the voltage of the backlight module when the first switch circuit is turned on, and inputs the third voltage obtained by the adjustment to the backlight module to control the display brightness of the backlight module through the third voltage.
  • the preset terminal is a first output terminal of the charging circuit.
  • the charging circuit includes a first current limiting circuit.
  • the charging circuit inputs a preset voltage to the first switching circuit through the preset terminal of the charging circuit.
  • the first current limiting circuit performs current limiting processing on the first preset voltage to obtain the preset voltage, and inputs the preset voltage to the first switch circuit through the first output terminal.
  • the preset terminal is an input terminal of the charging circuit
  • the charging circuit inputs the preset voltage to the first switching circuit through the preset terminal of the charging circuit, which may include:
  • the charging circuit inputs a preset voltage to the first switching circuit through an input terminal of the charging circuit.
  • the backlight control circuit includes a second current-limiting circuit.
  • the preset voltage is adjusted according to the voltage of the backlight module, and the adjusted third voltage is adjusted.
  • the voltage Before the voltage is input to the backlight module, it may also include:
  • the second current-limiting circuit receives the first voltage input by the power source, and performs current-limiting processing on the first voltage to obtain a preset voltage.
  • the first switching circuit is a switching circuit with a current limiting control function.
  • the preset voltage is adjusted according to the voltage of the backlight module, and the conditioning is performed.
  • the obtained third voltage is input to the backlight module, it may further include:
  • the first switch circuit detects a preset voltage at the first end of the first switch circuit, and if the preset voltage at the first end of the first switch circuit is less than a preset threshold, sending a closing request signal to the processor;
  • the processor also controls the first switch circuit to be turned on according to the closing request signal to input a preset voltage to the first adjustment circuit.
  • the backlight control method may further include:
  • the first switch circuit If the preset voltage at the first end of the first switch circuit is greater than a preset threshold, the first switch circuit sends an interrupt request signal to the processor;
  • the processor controls the first switch circuit to be turned off according to the interrupt request signal until the processor cannot receive the interrupt request signal.
  • the backlight control method may further include:
  • the processor is further configured to reduce the brightness of the backlight module according to the interrupt request signal until the processor cannot receive the interrupt request signal.
  • the backlight control circuit further includes a second switch circuit and a switch control circuit.
  • the method may further include:
  • the processor When the processor detects that there is no voltage at the input terminal of the charging circuit and there is a voltage in the charging circuit, the processor controls the second switch circuit to be turned on, and controls the first switch circuit to be turned off by the switch control circuit.
  • the switch control circuit includes a first resistor, a second resistor, and a diode.
  • the switch control circuit controls the first switch circuit to open, and may include:
  • the processor controls the first switch circuit to be turned off through the first resistor, the second resistor and the diode;
  • One end of the first resistor is connected to the output end of the diode, one end of the second resistor is connected to the input end of the diode, the other end of the second resistor is connected to the processor, and the input end of the diode is also connected to the first switching circuit.
  • an embodiment of the present application further provides a terminal device, which may include a battery, a backlight control circuit, and a backlight module;
  • the backlight control circuit is the backlight control circuit shown in any one of the embodiments of the first aspect.
  • the backlight control circuit, method and terminal device include a charging circuit, a first switching circuit, a first adjusting circuit, and a processor; wherein the charging circuit includes a second adjusting circuit; wherein an input end of the charging circuit and The output end of the power supply is connected, and the input / output end of the charging circuit is connected to the battery, so that when the power supply provides the first voltage to the charging circuit of the mobile phone, the charging circuit converts the first voltage input by the power supply to obtain a second voltage, and Two voltages are input to the battery to complete the charging of the battery.
  • the preset end of the charging circuit is connected to the first end of the first switching circuit. Terminal connection, the second terminal of the first switch circuit is connected to the processor, the third terminal of the first switch circuit is connected to the input terminal of the first adjustment circuit, and the output terminal of the first adjustment circuit is connected to the backlight module of the terminal device;
  • the charging circuit is used to receive the first voltage input from the power supply and input the second voltage obtained by the conversion process to the battery; the charging circuit is also used to communicate
  • the preset terminal inputs a preset voltage to the first switching circuit, and the preset voltage is a voltage that has not been adjusted by the second adjustment circuit of the charging circuit;
  • the processor is configured to control the first switching circuit when a voltage is detected at the input terminal of the charging circuit.
  • the first adjustment circuit is used to adjust the preset voltage according to the voltage of the backlight module when the first switch circuit is on, and input the adjusted third voltage to the backlight module to control the backlight by the third voltage
  • the display brightness of the module so as to provide the required voltage for the backlight module, so that when the terminal device is being charged and used, the first voltage output by the power supply to the required third voltage for the backlight module
  • the first voltage only passes through a power conversion of the first adjustment circuit, thereby improving the conversion efficiency of the backlight power of the mobile phone.
  • FIG. 1 is a schematic structural diagram of a backlight control circuit according to an embodiment of the present application.
  • FIG. 2 is a schematic structural diagram of another backlight control circuit according to an embodiment of the present application.
  • FIG. 3 is a schematic structural diagram of still another backlight control circuit according to an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of still another backlight control circuit according to an embodiment of the present application.
  • FIG. 5 is a schematic structural diagram of a backlight control circuit according to an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of another backlight control circuit according to an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of still another backlight control circuit according to an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of still another backlight control circuit according to an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of still another backlight control circuit according to an embodiment of the present application.
  • FIG. 10 is a schematic flowchart of a backlight control method according to an embodiment of the present application.
  • the terminal device may be a device having a charging function and a screen display function, such as a mobile phone, a tablet computer, a notebook computer, a palmtop computer, a wearable device, a car terminal, a virtual reality (VR) device, and the like.
  • wearable devices include, for example, smart watches and smart bracelets.
  • taking a mobile phone as an example in the process of using the mobile phone while charging, the conversion efficiency of the backlight power is usually improved to achieve the purpose of improving the charging efficiency of the mobile phone.
  • the conversion efficiency of the backlight power supply it is achieved by replacing the high-efficiency backlight IC, but the price of the high-efficiency backlight IC is higher, which will increase the cost of the mobile phone.
  • the backlight control circuit includes a charging circuit, a first switch circuit, a first adjustment circuit, and a processor.
  • the charging circuit includes a second adjustment circuit; wherein the input terminal of the charging circuit is connected to the output terminal of the power supply, and the input / output terminal of the charging circuit is connected to the battery, so that the power supply is charged when the power supply provides the first voltage to the charging circuit of the mobile phone;
  • the circuit converts the first voltage input by the power supply to obtain a second voltage, and inputs the second voltage to the battery to complete the charging of the battery.
  • the required voltage is provided to the backlight module to control the backlight module.
  • the terminal device is charged while being used.
  • the first voltage only undergoes one power conversion by the first adjustment circuit, thereby improving the conversion efficiency of the mobile phone backlight power.
  • the processor may be an application processor (AP) or a central processing unit (CPU).
  • AP application processor
  • CPU central processing unit
  • the processor may be an AP
  • the terminal device is a mobile phone or a tablet computer
  • the processor may be an AP
  • the terminal device is a notebook computer
  • the processor may be a CPU.
  • the preset terminal of the charging circuit is connected to the first terminal of the first switching circuit, so that when the preset voltage is input to the first switching circuit through the charging circuit, the preset terminal It can be set in two different ways.
  • the preset terminal can be the first output terminal of the charging circuit, and the first output terminal is the MOS tube and the second adjustment circuit that pass through the charging circuit. Between the ports.
  • the preset terminal may be an input terminal of a charging circuit, that is, a voltage of a power output terminal is directly input to the first switching circuit, so that the preset voltage is input to the first switching circuit through the charging circuit.
  • the preset terminal is the first output terminal of the charging circuit, that is, when the first output terminal of the charging circuit is connected to the first terminal of the first switching circuit, please refer to FIG. 1.
  • FIG. 1 is a schematic structural diagram of a backlight control circuit according to an embodiment of the present application.
  • the backlight control circuit may include:
  • a charging circuit a first switching circuit, a first adjusting circuit, and a processor; wherein the charging circuit includes a second adjusting circuit;
  • the charging circuit is configured to receive a first voltage input from a power source, and input a second voltage obtained by conversion processing to a battery.
  • the charging circuit is further configured to input a preset voltage to the first switching circuit through the first output terminal, and the preset voltage is a voltage that has not been adjusted by the second adjustment circuit of the charging circuit.
  • the processor is configured to control the first switch circuit to be turned on when a voltage is detected at an input terminal of the charging circuit.
  • the first adjustment circuit is used to adjust a preset voltage according to the voltage of the backlight module when the first switch circuit is turned on, and input the third voltage obtained by the adjustment to the backlight module to control the backlight module by the third voltage. Display brightness.
  • the charging circuit may be Charge-IC.
  • the charging circuit further includes a first current limiting circuit, a first MOS tube, a control sub-circuit, and a second MOS tube.
  • the input terminal of the first current limiting circuit is connected to the output terminal of the power supply.
  • the output terminal of the first current limiting circuit is connected to the first terminal of the first MOS tube and the first terminal of the control sub-circuit, respectively.
  • the power source may be a USB power source.
  • the charging circuit further includes a first current limiting circuit, a first MOS tube, a control sub-circuit, and a second MOS tube
  • the first output terminal in the embodiment of the present application is the second terminal and the first terminal of the MOS tube.
  • the output terminal between the first ends of the two adjustment circuits, that is, the second end of the MOS tube and the first end of the second adjustment circuit are respectively connected to the first switching circuit through the first output terminal, so that the first output terminal
  • the first switch circuit inputs a preset voltage.
  • the first output terminal may be a power midpoint (PMID), a midpoint (MID), a USB midpoint (Universal Serial BusMidpoint, USB_MID), and a charging power midpoint.
  • PMID power midpoint
  • MID midpoint
  • USB_MID Universal Serial BusMidpoint
  • CHG_VMID Charge, Voltage Midpoint, CHG_VMID
  • VMID Power intermediate point
  • the embodiments of the present application only use the foregoing types as examples, but it does not mean that the embodiments of the present application are only limited. herein.
  • the first switching circuit may be any one of a MOS transistor, a transistor, a transistor, and a load switch.
  • it may also be another circuit having the function of the first switching circuit.
  • the embodiment of the present application only uses the The first switch circuit may be any one of a MOS transistor, a transistor, a transistor, and a load switch for illustration, but it does not mean that the embodiments of the present application are limited to this.
  • the backlight control circuit provided in the embodiment of the present application provides a voltage to the charging circuit through a power source
  • the first voltage at the input end of the charging circuit first passes the first current limiting circuit to limit the current
  • the Part of the voltage is input to the battery through the second MOS tube to charge the battery.
  • another part of the voltage after the current limitation passes through the first MOS tube and passes between the first MOS tube and the second adjustment circuit.
  • the first output end of the input is input to the first switching circuit.
  • the processor When the processor detects a voltage at the input end of the charging circuit, the processor controls the first switching circuit to be turned on, so that when the first switching circuit is turned on, according to the backlight,
  • the voltage of the module is adjusted to a preset voltage, and the adjusted third voltage is input to the backlight module to control the display brightness of the backlight module through the third voltage, so as to provide the required voltage to the backlight module, so that the terminal device
  • the first voltage only passes through the first A full power conversion circuit, thereby increasing the conversion efficiency of the mobile phone backlight power.
  • the first adjustment circuit may be a boost circuit or a buck circuit
  • the second adjustment circuit may also be a boost circuit or a buck circuit.
  • the first adjustment circuit is a step-up circuit; or when the second adjustment circuit is a step-up circuit, the first adjustment circuit is a step-down circuit.
  • the first adjustment circuit is also a boost circuit.
  • the first adjustment circuit is a backlight boost circuit
  • the second adjustment circuit is a buck boost circuit
  • the first voltage input by the power supply is 5V.
  • the first voltage is first converted by the first MOS tube.
  • the on-resistance of the first MOS tube is less than 10mohm.
  • the voltage converted by the first MOS tube is 4.98V
  • the voltage is input to the battery through the Buck Boost circuit and the second MOS tube to charge the battery.
  • the voltage is input to the first switching circuit through the PMID.
  • the processor detects the 4.98V voltage at the input terminal of the Charge-IC, it indicates that the voltage is being supplied to the Charge-IC by the power supply.
  • the processor controls the first switching circuit. It is turned on to input the 4.98V voltage to the backlight boost circuit.
  • the backlight module includes 36 lamp beads (LED)
  • the composition of the 36 lamp beads is such that every 9 are connected in series to form a group, and then 4 groups are formed in parallel.
  • the voltage required for each lamp bead is 3V, corresponding to the backlight module should provide 27V voltage, because the current voltage is only 4.98V, so you need to boost the 4.98V voltage through the backlight Boost circuit first Processing so that the voltage output through the backlight boost circuit is 27V, and inputting the 27V voltage to the backlight module, so as to control the display brightness of the backlight module through the 27V voltage, so as to provide the required voltage for the backlight module, In this way, when the terminal device is being charged and used, the process from the 5V voltage output by the power supply to the required 27V voltage for the backlight module is only converted once by the first adjustment circuit, thereby improving the backlight of the mobile phone. Power conversion efficiency. For an example, see Table 1:
  • the current of 1455mA passes the Buck boost circuit and the second MOS tube, and is input to the battery to 1723.03mA, and the charging time is 167.15min, the actual charging income is 23.68mA, the charging time benefit is 2.33min, and the actual charging current is 1.39 %, The charging time benefit is 1.37%; when the backlight control voltage provided by the embodiment of the present application is used, the 2000mA is shunted after passing through the first MOS tube, wherein a current of 490mA is input to the backlight module through PMID, and a current of 1510mA passes Buck boost circuit and second MOS tube, and input to the battery to 1788.16mA, and the charging time is 161.06min, the actual charging revenue is 88.82mA, the charging time revenue is 8.42min, the charging current actual revenue is 5.22%, and the charging time revenue is 4.97%; it can be seen that compared with the prior art, the actual benefit of the charging current of the backlight control circuit provided by the embodiment of the embodiment
  • FIG. 1 described in detail the implementation principle and beneficial effects of the backlight control circuit provided by the present application when the preset terminal is the first output terminal of the charging circuit.
  • FIGS. 2 to 4 the implementation principle and beneficial effects of the backlight control circuit provided by the present application when the preset terminal is the input terminal of the charging circuit.
  • the first switching circuit when the input terminal of the charging circuit is connected to the first terminal of the first switching circuit, in order to prevent the power from being burned out, the first switching circuit is a switching circuit with a current limiting control function.
  • the current limiting control function can be implemented through the Fault pin.
  • FIG. 2 is a schematic structural diagram of another backlight control circuit according to an embodiment of the present application.
  • the backlight control circuit may include:
  • a charging circuit a first switching circuit, a first adjusting circuit, and a processor; wherein the charging circuit includes a second adjusting circuit;
  • the input terminal of the charging circuit is connected to the output terminal of the power supply, the input / output terminal of the charging circuit is connected to the battery, the input terminal of the charging circuit is connected to the first terminal of the first switching circuit, and the second terminal of the first switching circuit is connected to
  • the processor is connected, the third end of the first switching circuit is connected to the input end of the first adjustment circuit, and the output end of the first adjustment circuit is connected to the backlight module of the terminal device.
  • the charging circuit is further configured to input a preset voltage (that is, the first voltage) to the first switching circuit through the input terminal, and the preset voltage is a voltage that has not been adjusted by the second adjustment circuit of the charging circuit.
  • the processor is configured to control the first switch circuit to be turned on when a voltage is detected at an input terminal of the charging circuit.
  • the first adjustment circuit is used to adjust a preset voltage according to the voltage of the backlight module when the first switch circuit is turned on, and input the third voltage obtained by the adjustment to the backlight module to control the backlight module by the third voltage. Display brightness.
  • the charging circuit may be Charge-IC.
  • the charging circuit further includes a first current limiting circuit, a first MOS tube, a control sub-circuit, and a second MOS tube.
  • the input terminal of the first current limiting circuit is connected to the output terminal of the power supply.
  • the output terminal of the first current limiting circuit is connected to the first terminal of the first MOS tube and the first terminal of the control sub-circuit, respectively. Is connected to the first end of the second adjustment circuit, the second end of the second adjustment circuit is connected to the second end of the control submodule and the first end of the second MOS tube, and the second end of the second MOS tube is connected to the battery connection.
  • the first switching circuit may be any one of a MOS transistor, a transistor, a transistor, and a load switch.
  • it may also be another circuit having the function of the first switching circuit.
  • the embodiment of the present application only uses the The first switch circuit may be any one of a MOS transistor, a transistor, a transistor, and a load switch for illustration, but it does not mean that the embodiments of the present application are limited to this.
  • the processor controls the first switch circuit to be turned on when it detects that there is a voltage at the input terminal of the charging circuit.
  • the first switch circuit could first detect the first voltage of the first terminal of the first switch circuit. If the first voltage of the first terminal of the first switch circuit is less than a preset threshold, a closing request signal is sent to the processor to The processor is controlled to turn on the first switching circuit according to the closing request signal, so as to provide the required voltage to the backlight module through the power source, so that the first voltage from the power source to the third voltage of the backlight module only passes through the first adjustment circuit.
  • One power conversion which improves the conversion efficiency of mobile phone backlight power.
  • the first switch circuit is further configured to send an interrupt request signal to the processor if the first voltage at the first end of the first switch circuit is greater than a preset threshold; so that the processor receives the interrupt request signal according to the interrupt
  • the request signal controls the first switch circuit to be turned off, and gradually reduces the brightness of the backlight module until the processor cannot receive the interrupt request signal; or controls the brightness of the backlight module to be reduced according to the interrupt request signal until the processor cannot receive the interrupt.
  • Request signal to achieve short circuit protection and avoid the charger from being burned out.
  • the backlight control circuit provided in the embodiment of the present application provides a voltage to the charging circuit through a power source
  • the first voltage at the input end of the charging circuit first passes the first current-limiting circuit to limit the current, and divides the current-limited voltage into the The voltage is input to the battery through the second MOS tube to charge the battery.
  • the first voltage can be directly input to the first switching circuit through the input terminal of the charging circuit (that is, the output terminal of the power supply).
  • the first switching circuit When there is a voltage at the input terminal of the charging circuit and the first voltage at the first terminal of the first switching circuit is less than a preset threshold, controlling the first switching circuit to be turned on, so that the first adjusting circuit is turned on when the first switching circuit is turned on, Adjust the first voltage according to the voltage of the backlight module, and input the adjusted third voltage to the backlight module to control the display brightness of the backlight module through the third voltage, so as to provide the required voltage to the backlight module.
  • the first voltage is only in the process from the first voltage output by the power supply to the required third voltage provided for the backlight module. Through the first circuit of a power conversion adjustment, thereby improving the conversion efficiency of the mobile phone backlight power.
  • the first adjustment circuit may be a boost circuit or a buck circuit
  • the second adjustment circuit may also be a boost circuit or a buck circuit.
  • the first adjustment circuit is a step-up circuit; or when the second conditioning telephone is a step-up circuit, the first adjustment circuit is a step-down circuit.
  • the first adjustment circuit is also a backlight boost circuit
  • the second adjustment circuit is a buck boost circuit
  • the first voltage of the power input is 5V as an example, and the current of 2A is taken as an example.
  • the first voltage is first passed through the first A MOS tube is used for conversion.
  • the on-resistance of the first MOS tube is less than 10mohm
  • the voltage after the first MOS tube is converted is 4.98V
  • the voltage is input to the battery through the Buck boost circuit and the second MOS tube to realize the battery.
  • the first switch circuit input terminal.
  • the processor detects the 5V voltage at the input terminal of the Charge-IC and the current passing through the first switch circuit is less than the preset threshold, it means that the current is passing through the power supply.
  • the Charge-IC provides voltage.
  • the processor controls the first switch circuit to be turned on, so that the 4.98V voltage is input to the backlight boost circuit.
  • the backlight module includes 36 LEDs, 36 LEDs The method is that every 9 pieces are connected in series to form a group, and then 4 groups are connected in parallel to form a backlight module structure.
  • the voltage required for each lamp bead is 3V, and the corresponding backlight module should be provided with 27V.
  • the 5V voltage needs to be boosted by the backlight boost circuit so that the voltage output by the backlight boost circuit is 27V, and the 27V voltage is input to the backlight module to control the backlight module by the 27V voltage. Display brightness, so as to provide the required voltage for the backlight module. In this way, when the terminal device is being charged and used, the process from the 5V voltage output by the power supply to the required 27V voltage for the backlight module is only passed through. A power conversion of the first adjustment circuit, thereby improving the conversion efficiency of the backlight power of the mobile phone.
  • the charging circuit can be A second current-limiting circuit is provided between the input terminal and the first terminal of the first switching circuit.
  • FIG. 3 is a schematic structural diagram of still another backlight control circuit according to an embodiment of the present application.
  • the control circuit may further include:
  • An input terminal of the second current limiting circuit is connected to the input terminal of the charging circuit, and an output terminal of the second current limiting circuit is connected to the first terminal of the first switching circuit.
  • the second current limiting circuit is configured to receive a first voltage input from the power source, and perform current limiting processing on the first voltage to obtain a preset voltage.
  • a second current-limiting circuit is provided between the input terminal of the charging circuit and the first terminal of the first switching circuit, so that the second current-limiting circuit can A voltage is first subjected to current limiting processing.
  • the first voltage input through the input terminal is 5V
  • the current is processed by the second current limiting circuit to obtain a voltage of 4V
  • the 4V voltage is input to the first switching circuit.
  • the processor controls the first switch circuit to be turned on, thereby inputting the 4V voltage to the backlight Boost circuit.
  • the group includes 36 lamp beads (LED).
  • the composition method of 36 lamp beads is that each 9 pieces are connected in series to form a group, and then 4 groups are connected in parallel to form a backlight module structure.
  • the voltage required for each lamp bead is 3V.
  • the backlight module should be provided with a 27V voltage. Since the current voltage is only 4V, the 4V voltage needs to be boosted by the backlight Boost circuit first, so that the voltage output by the backlight Boost circuit is 27V, and the 27V
  • the input voltage is input to the backlight module to control the display brightness of the backlight module through the 27V voltage, so as to provide the backlight module with the required voltage. In this way, the terminal device is charged from the 5V voltage output to the power supply while being used. In the process of providing the required 27V voltage for the backlight module, only one power conversion by the first adjustment circuit is performed, thereby improving the conversion efficiency of the backlight power of the mobile phone.
  • the second current limiting circuit includes an overcurrent detection circuit, an overtemperature detection circuit, an AND gate, and an abnormal state output circuit.
  • FIG. 4 is another backlight control circuit provided by an embodiment of the present application.
  • the schematic diagram of the backlight control circuit may further include:
  • the first terminal of the overcurrent detection circuit and the first terminal of the overtemperature detection circuit are both connected to the input terminal of the charging circuit, and the second terminal of the overcurrent detection circuit is connected to the first terminal of the AND gate.
  • the second end is connected to the second end of the AND gate, the third end of the AND gate is connected to the first end of the abnormal state output circuit, and the second end of the abnormal state output circuit is connected to the first end of the first switch circuit.
  • the second current limiting circuit is only used as an example for description, including a current detection circuit, an over-temperature detection circuit, an AND gate, and an abnormal state output circuit.
  • Other forms of current limiting circuits may also be used.
  • the embodiments of the present application are not further limited.
  • FIG. 5 is a schematic structural diagram of a backlight control circuit according to an embodiment of the present application.
  • the first output terminal of the charging circuit and the first switch are provided.
  • the first end of the circuit is connected as an example.
  • the backlight control circuit may further include a second switch circuit and a switch control circuit.
  • the first terminal of the second switching circuit is connected to the second output terminal of the charging circuit, the second terminal of the second switching circuit is connected to the processor, and the third terminal of the second switching circuit is connected to the input terminal of the first adjustment circuit. ;
  • the input terminal of the switch control circuit is connected to the processor, and the output terminal of the switch control circuit is connected to the third terminal of the first switch circuit.
  • the processor is further configured to control the second switch circuit to be turned on when it is detected that there is no voltage at the input terminal of the charging circuit, and to control the first switch circuit to be turned off by the switch control circuit.
  • the second switch circuit may also be any one of a MOS transistor, a transistor, a transistor, and a load switch.
  • it may also be another circuit having the function of the first switch circuit.
  • the embodiment of the present application is only
  • the first switch circuit may be any one of a MOS transistor, a transistor, a transistor, and a load switch for illustration, but it does not mean that the embodiment of the present application is limited to this.
  • the switch control circuit includes a first resistor, a second resistor, and a diode; wherein one end of the first resistor is connected to the output terminal of the diode, one end of the second resistor is connected to the input terminal of the diode, and the other end of the second resistor is Connected to the processor, the input terminal of the diode is also connected to the third terminal of the first switching circuit.
  • the diodes in the above-mentioned switch control circuit can also be replaced with MOS transistors or triodes, that is, the switch control circuit can also include the first resistor, the second resistor and the MOS tube, or the switch control circuit can also include the first resistor, the second Resistors and transistors.
  • the switch control circuit may also include a first resistor, a second resistor, and a MOS transistor, refer to FIG. 6 for a corresponding diagram.
  • FIG. 6 is a schematic structural diagram of another backlight control circuit according to an embodiment of the present application.
  • the second switch circuit and the switch control circuit are provided, so that when the input terminal of the terminal device is not connected to the power source, but there is voltage in the charging circuit of the terminal device, in order to avoid the control caused by erroneous switching
  • the switch circuit is turned off and the required voltage is provided to the backlight module.
  • the switch control circuit can be used to control the first switch circuit to be turned off and the second switch circuit to be turned on to pass the first adjustment when the second switch circuit is turned on.
  • the circuit inputs the required voltage to the backlight module, and controls the display brightness of the backlight module by the input voltage, so as to provide the required voltage to the backlight module while charging, so as to control the display brightness of the backlight module.
  • the second switch control circuit may also be Switching circuit with limited current control function.
  • GPIO3_USB_ID and GPIO2 can form an OR logic gate in hardware. When they are pulled low, the corresponding GPIO3_USB_ID is set to 0. When GPIO3_USB_ID is 0, the EN state of the corresponding first switch circuit is always 0, the first switch circuit is disconnected, so the occurrence of erroneous switching can be avoided, so that the input terminal of the terminal device is not connected to the power source, but when there is a voltage in the charging circuit of the terminal device, the first A switch circuit is turned off and the second switch circuit is controlled to be turned on, so that when the second switch circuit is turned on, the required voltage is input to the backlight module through the first adjustment circuit, and the display of the backlight module is controlled by the input voltage Brightness, so that the required voltage is provided to the backlight module while charging to control the display brightness of the backlight module.
  • FIG. 5 is a schematic structural diagram of another backlight control circuit according to an embodiment of the present application
  • FIG. 8 is a schematic structural diagram of another backlight control circuit according to an embodiment of the present application
  • FIG. 9 is another exemplary backlight control circuit according to an embodiment of the present application. Schematic diagram of the backlight control circuit.
  • the backlight control method may be applied to a backlight control circuit.
  • the backlight control circuit includes a charging circuit, a first switch circuit, a first adjustment circuit, and a processor.
  • the charging circuit includes a second adjustment circuit. As shown in FIG. 10, the backlight control method may include:
  • the charging circuit inputs a preset voltage to the first switching circuit through a preset terminal of the charging circuit, and the preset voltage is a voltage that has not been adjusted by the second adjusting circuit of the charging circuit.
  • the processor controls the first switch circuit to be turned on when a voltage is detected at an input terminal of the charging circuit.
  • the first adjustment circuit adjusts a preset voltage according to the voltage of the backlight module, and inputs the third voltage obtained by the adjustment to the backlight module, so as to control the backlight module by the third voltage. Display brightness.
  • the charging circuit when a voltage is supplied to a charging circuit through a power source, the charging circuit receives a first voltage input from the power source and, on the one hand, converts and obtains a second voltage into the battery to achieve The battery is charged.
  • a preset voltage is input to the first switching circuit through a preset terminal of the charging circuit.
  • the preset voltage is a voltage adjusted by the second adjustment circuit of the charging circuit.
  • the processor detects the input terminal of the charging circuit.
  • the first switch circuit When there is a voltage, the first switch circuit is controlled to be turned on, so that the first adjustment circuit adjusts a preset voltage according to the voltage of the backlight module when the first switch circuit is turned on, and inputs the adjusted third voltage to the backlight module.
  • the first voltage output from the power supply is provided to the backlight module.
  • the first voltage In the process of the required third voltage, the first voltage only undergoes a power conversion by the first adjustment circuit, thereby improving the backlight of the mobile phone. The conversion efficiency of the source.
  • the preset terminal is a first output terminal of the charging circuit.
  • the charging circuit includes a first current limiting circuit.
  • the charging circuit inputs a preset voltage to the first switching circuit through the preset terminal of the charging circuit, including:
  • the first current-limiting circuit performs current-limiting processing on the first preset voltage to obtain the preset voltage, and inputs the preset voltage to the first switching circuit through the first output terminal, thereby preventing the charger from being burned out due to excessive current, and achieving Current limiting control of preset voltage.
  • the preset terminal is an input terminal of the charging circuit, and the charging circuit inputs a preset voltage to the first switching circuit through the preset terminal of the charging circuit, including:
  • the charging circuit inputs a preset voltage to the first switching circuit through an input terminal of the charging circuit.
  • the backlight control circuit includes a second current limiting circuit.
  • the first adjustment circuit adjusts a preset voltage according to the voltage of the backlight module, and inputs the third voltage obtained by the adjustment to the backlight mode.
  • the group it also includes:
  • the second current-limiting circuit receives the first voltage input from the power supply; performs current-limiting processing on the first voltage to obtain a preset voltage, so that the second current-limiting circuit can first limit the first voltage input through the battery input terminal. Current processing to prevent the charger from burning out due to excessive current, and achieve current limit control of the preset voltage.
  • the first switching circuit is a switching circuit with a current-limiting control function.
  • the preset voltage is adjusted according to the voltage of the backlight module, and the adjusted third voltage is adjusted.
  • the backlight module Before inputting to the backlight module, it also includes:
  • the first switch circuit detects a preset voltage at the first end of the first switch circuit, and if the preset voltage at the first end of the first switch circuit is less than a preset threshold, sends a closing request signal to the processor.
  • the processor also controls the first switch circuit to be turned on according to the closing request signal to input a preset voltage to the first adjustment circuit.
  • the backlight control method may further include:
  • the first switch circuit If the preset voltage at the first end of the first switch circuit is greater than a preset threshold, the first switch circuit sends an interrupt request signal to the processor.
  • the processor controls the first switch circuit to be turned off according to the interrupt request signal until the processor cannot receive the interrupt request signal.
  • the backlight control method may further include:
  • an interrupt request signal is sent to the processor.
  • the processor is further configured to reduce the brightness of the backlight module according to the interrupt request signal until the processor cannot receive the interrupt request signal.
  • the backlight control circuit further includes a second switch circuit and a switch control circuit.
  • the backlight control method may further include:
  • the second switching circuit is controlled to be turned on, and the first switching circuit is controlled to be turned off through the switching control circuit, thereby avoiding the occurrence of false switching, thereby
  • the switch control circuit can be used to control the first switch circuit to be turned off and the second switch circuit to be turned on to control the
  • the switch circuit is turned on, the required voltage is input to the backlight module through the first adjustment circuit, and the display brightness of the backlight module is controlled by the input voltage, so that the required voltage is provided to the backlight module while charging to control the backlight. Display brightness of the module.
  • the switch control circuit includes a first resistor, a second resistor, and a diode.
  • the switch control circuit controls the first switch circuit to open, including:
  • the processor controls the first switch circuit to be turned off through the first resistor, the second resistor, and the diode.
  • One end of the first resistor is connected to the output end of the diode, one end of the second resistor is connected to the input end of the diode, the other end of the second resistor is connected to the processor, and the input end of the diode is also connected to the first switching circuit.
  • the backlight control method shown in the embodiments of the present application can execute the technical solution of the backlight control circuit shown in any of the above embodiments.
  • the implementation principles and beneficial effects of the backlight control circuit are similar.
  • FIG. 11 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
  • the terminal device may include a battery, a backlight control circuit, and a backlight module.
  • the backlight control circuit is the backlight control circuit shown in any one of the above embodiments.
  • the terminal device shown in this embodiment of the present application can execute the technical solution of the backlight control circuit shown in any one of the above embodiments, and the implementation principle and beneficial effects thereof are similar, and details are not described herein again.

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Abstract

本申请提供一种背光控制电路、方法及终端设备，包括：充电电路、第一开关电路、第一调整电路及处理器；充电电路用于接收电源输入的第一电压，并将转换处理得到第二电压输入至电池；充电电路还用于通过预设端向第一开关电路输入预设电压，预设电压为未经过充电电路的第二调整电路调整的电压；处理器用于在检测到充电电路的输入端有电压时，控制第一开关电路导通；第一调整电路用于在第一开关电路导通时，根据背光模组的电压调整预设电压，并将调理得到的第三电压输入至背光模组，以通过第三电压控制背光模组的显示亮度，从而提高了手机背光电源的转换效率。

Description

背光控制电路、方法及终端设备 技术领域
本申请涉及终端设备技术领域，尤其涉及一种背光控制电路、方法及终端设备。
背景技术
随着智能手机、平板电脑等移动终端的不断发展，在对移动终端充电的过程中，用户可能会使用该移动终端处理其他业务。以移动终端为手机为例，当手机一边充电，一边播放视频时，其显示屏的功耗占手机系统总功耗的60％以上，而显示屏的功耗的90％主要用于背光显示，从而导致手机充电较慢。示例的，显示屏可以为液晶显示屏(Liquid Crystal Display，LCD)，或有机发光二极管(Organic Light-Emitting Diode，OLED)显示屏，或者其他类型的显示屏。
为了提高手机充电效率，现有技术中，通常是通过提升背光电源的转换效率，以达到提高手机充电效率目的。在提升背光电源的转换效率时，是通过更换高效率的背光集成电路(integrated circuit，IC)实现，但高效率的背光IC的价格较高，这样会增加手机的成本，从而导致手机成本较高。
因此，在手机边充电、边被使用的过程中，如何提高手机背光电源的转换效率是本领域技术人员亟待解决的问题。
发明内容
本申请提供一种背光控制电路、方法及终端设备，以提高终端设备背光电源的转换效率。
第一方面，本申请实施例提供一种背光控制电路，该背光控制电路可以包括：
充电电路、第一开关电路、第一调整电路及处理器；其中，充电电路包括第二调整电路；
其中，充电电路的输入端与电源的输出端连接，充电电路的输入/输出端与电池连接，充电电路的预设端与第一开关电路的第一端连接，第一开关电路的第二端与处理器连接，第一开关电路的第三端与第一调整电路的输入端连接，第一调整电路的输出端与终端设备的背光模组连接；
充电电路用于接收电源输入的第一电压，并将转换处理得到第二电压输入至电池；
充电电路还用于通过预设端向第一开关电路输入预设电压，预设电压为未经过充电电路的第二调整电路调整的电压；
处理器用于在检测到充电电路的输入端有电压时，控制第一开关电路导通；
第一调整电路用于在第一开关电路导通时，根据背光模组的电压调整预设电压，并将 调理得到的第三电压输入至背光模组，以通过第三电压控制背光模组的显示亮度。
由此可见，本申请实施例提供的背光控制电路，在通过电源为充电电路提供电压时，充电电路输入端的第一电压先经过第一限流电路进行限流，并将限流后的电压中的一部分电压经过第二MOS管输入至电池，以实现为电池充电，此外，限流后的电压中的另一部分电压经过第一MOS管后，并通过第一MOS管和第二调整电路之间的第一输出端输入至第一开关电路，处理器在检测到充电电路的输入端有电压时，控制第一开关电路导通，使得第一调整电路在第一开关电路导通时，根据背光模组的电压调整预设电压，并将调理得到的第三电压输入至背光模组，以通过第三电压控制背光模组的显示亮度，从而实现为背光模组提供所需电压，这样终端设备在边充电，边被使用时，从电源输出的第一电压到为背光模组提供的所需的第三电压的过程中，第一电压只经过第一调整电路的一次电源转换，从而提高了手机背光电源的转换效率。
在一种可能的实现方式中，充电电路还包括第一限流电路、第一MOS管、控制子电路及第二MOS管；
其中，第一限流电路的输入端与电源的输出端连接，第一限流电路的输出端分别与第一MOS管的第一端及控制子电路的第一端连接，MOS管的第二端与第二调整电路的第一端连接，第二调整电路的第二端分别与控制子模块的第二端及第二MOS管的第一端连接，第二MOS管的第二端与电池连接。
在一种可能的实现方式中，预设端为充电电路的第一输出端，MOS管的第二端和第二调整电路的第一端分别通过第一输出端与第一开关电路连接。
在一种可能的实现方式中，预设端为充电电路的输入端。
在一种可能的实现方式中，该背光控制电路还可以包括第二限流电路；
其中，第二限流电路的输入端与充电电路的输入端连接，第二限流电路的输出端与第一开关电路的第一端连接；
第二限流电路用于接收电源输入的第一电压，并对第一电压进行限流处理，得到预设电压，从而防止电流过大导致充电器烧坏，实现对预设电压的限流控制。
在一种可能的实现方式中，第一开关电路为具有限流控制功能的开关电路；
第一开关电路还用于检测第一开关电路的第一端的预设电压，若第一开关电路的第一端的预设电压小于预设阈值，向处理器发送闭合请求信号；
处理器还用于根据闭合请求信号控制第一开关电路导通。
在一种可能的实现方式中，第一开关电路还用于若第一开关电路的第一端的预设电压大于预设阈值，向处理器发送中断请求信号；
处理器还用于根据中断请求信号控制第一开关电路断开，直至处理器接收不到中断请求信号。
在一种可能的实现方式中，第一开关电路还用于若第一开关电路的第一端的预设电压大于预设阈值，向处理器发送中断请求信号；
处理器还用于根据中断请求信号控制降低背光模组的亮度，直至处理器接收不到中断请求信号。
在一种可能的实现方式中，该背光控制电路还可以包括第二开关电路及开关控制电路；
其中，第二开关电路的第一端与充电电路的第二输出端连接，第二开关电路的第二端 与处理器连接，第二开关电路的第三端与第一调整电路的输入端连接；开关控制电路的输入端与处理器连接，开关控制电路的输出端与第一开关电路的第三端连接；
处理器还用于在检测到充电电路的输入端无电压，且充电电路中有电压时，控制第二开关电路导通，并通过开关控制电路控制第一开关电路断开，可以避免误切换的发生，从而实现在终端设备的输入端没有与电源连接，但终端设备的充电电路中有电压时，可以通过该开关控制电路控制第一开关电路断开，并控制第二开关电路导通，以在第二开关电路导通时，通过第一调整电路向背光模组输入所需电压，并通过输入的电压控制背光模组的显示亮度，从而实现边充电边向背光模组提供所需电压，以控制背光模组的显示亮度。
在一种可能的实现方式中，开关控制电路可以包括第一电阻、第二电阻及二极管；
其中，第一电阻的一端与二极管的输出端连接，第二电阻的一端与二极管的输入端连接，第二电阻的另一端与处理器连接，二极管的输入端还与第一开关电路的第三端连接。
在一种可能的实现方式中，第二限流电路可以包括过流检测电路、过温检测电路、与门及异常状态输出电路；
其中，过流检测电路的第一端和过温检测电路的第一端均与充电电路的输入端连接，过流检测电路的第二端与与门的第一端连接，过温检测电路的第二端与与门的第二端连接，与门的第三端与异常状态输出电路的第一端连接，异常状态输出电路的第二端与第一开关电路的第一端连接。
在一种可能的实现方式中，当第二调整电路为降压电路时，第一调整电路为升压电路；或者，当第二调理电话为升压电路时，第一调整电路为降压电路。
在一种可能的实现方式中，第一输出端为电源中间点PMID、中间点MID、USB中间点USB_MID、充电电源中间点CHG_VMID及电源中间点VMID中的任一种。
在一种可能的实现方式中，第二开关电路为具有限流控制功能的开关电路。
在一种可能的实现方式中，第一开关电路为MOS管、三极管、晶体管及负载开关中的任一种。
第二方面，本申请实施例还提供一种背光控制方法，应用于背光控制电路，背光控制电路包括充电电路、第一开关电路、第一调整电路及处理器，其中，充电电路包括第二调整电路，该背光控制方法可以包括：
充电电路接收电源输入的第一电压，并将转换处理得到第二电压输入至电池；
充电电路通过充电电路的预设端向第一开关电路输入预设电压，预设电压为未经过充电电路的第二调整电路调整的电压；
处理器在检测到充电电路的输入端有电压时，控制第一开关电路导通；
第一调整电路在第一开关电路导通时，根据背光模组的电压调整预设电压，并将调理得到的第三电压输入至背光模组，以通过第三电压控制背光模组的显示亮度。
在一种可能的实现方式中，预设端为充电电路的第一输出端，充电电路包括第一限流电路，充电电路通过充电电路的预设端向第一开关电路输入预设电压，可以包括：
第一限流电路对第一预设电压进行限流处理，得到预设电压，并通过第一输出端向第一开关电路输入预设电压。
在一种可能的实现方式中，预设端为充电电路的输入端，充电电路通过充电电路的预设端向第一开关电路输入预设电压，可以包括：
充电电路通过充电电路的输入端向第一开关电路输入预设电压。
在一种可能的实现方式中，背光控制电路包括第二限流电路，第一调整电路在第一开关电路导通时，根据背光模组的电压调整预设电压，并将调理得到的第三电压输入至背光模组之前，还可以包括：
第二限流电路接收电源输入的第一电压；并对第一电压进行限流处理，得到预设电压。
在一种可能的实现方式中，第一开关电路为具有限流控制功能的开关电路，第一调整电路在第一开关电路导通时，根据背光模组的电压调整预设电压，并将调理得到的第三电压输入至背光模组之前，还可以包括：
第一开关电路检测第一开关电路的第一端的预设电压，若第一开关电路的第一端的预设电压小于预设阈值，向处理器发送闭合请求信号；
处理器还根据闭合请求信号控制第一开关电路导通，以向第一调整电路输入预设电压。
在一种可能的实现方式中，该背光控制方法还可以包括：
若第一开关电路的第一端的预设电压大于预设阈值，第一开关电路向处理器发送中断请求信号；
处理器根据中断请求信号控制第一开关电路断开，直至处理器接收不到中断请求信号。
在一种可能的实现方式中，该背光控制方法还可以包括：
若第一开关电路的第一端的预设电压大于预设阈值，向处理器发送中断请求信号；
处理器还用于根据中断请求信号控制降低背光模组的亮度，直至处理器接收不到中断请求信号。
在一种可能的实现方式中，背光控制电路还包括第二开关电路和开关将控制电路，方法还可以包括：
当处理器检测到充电电路的输入端无电压，且充电电路中有电压时，控制第二开关电路导通，并通过开关控制电路控制第一开关电路断开。
在一种可能的实现方式中，开关控制电路包括第一电阻、第二电阻及二极管，通过开关控制电路控制第一开关电路断开，可以包括：
处理器通过第一电阻、第二电阻及二极管控制第一开关电路断开；
其中，第一电阻的一端与二极管的输出端连接，第二电阻的一端与二极管的输入端连接，第二电阻的另一端与处理器连接，二极管的输入端还与第一开关电路连接。
第三方面，本申请实施例还提供一种终端设备，该终端设备可以包括电池、背光控制电路及背光模组；
其中，背光控制电路为上述第一方面任一实施例所示的背光控制电路。
本申请实施例提供的背光控制电路、方法及终端设备，包括充电电路、第一开关电路、第一调整电路及处理器；其中，充电电路包括第二调整电路；其中，充电电路的输入端与电源的输出端连接，充电电路的输入/输出端与电池连接，使得电源向手机的充电电路提供第一电压时，充电电路对电源输入的第一电压进行转换处理得到第二电压，并将第二电压输入至电池，以完成对电池的充电；此外，在为背光模组提供所需电压，以控制背光模组的显示亮度时，将充电电路的预设端与第一开关电路的第一端连接，第一开关电路的第二端与处理器连接，第一开关电路的第三端与第一调整电路的输入端连接，第一调整电路的输出端与终端设备的背光模组连接；充电电路用于接收电源输入的第一电压，并将转换处 理得到第二电压输入至电池；充电电路还用于通过预设端向第一开关电路输入预设电压，预设电压为未经过充电电路的第二调整电路调整的电压；处理器用于在检测到充电电路的输入端有电压时，控制第一开关电路导通；第一调整电路用于在第一开关电路导通时，根据背光模组的电压调整预设电压，并将调理得到的第三电压输入至背光模组，以通过第三电压控制背光模组的显示亮度，从而实现为背光模组提供所需电压，这样终端设备在边充电，边被使用时，从电源输出的第一电压到为背光模组提供的所需的第三电压的过程中，第一电压只经过第一调整电路的一次电源转换，从而提高了手机背光电源的转换效率。
附图说明
图1为本申请实施例提供的一种背光控制电路的结构示意图；
图2为本申请实施例提供的另一种背光控制电路的结构示意图；
图3为本申请实施例提供的再一种背光控制电路的结构示意图；
图4为本申请实施例提供的又一种背光控制电路的结构示意图；
图5为本申请实施例提供的一种背光控制电路的结构示意图；
图6为本申请实施例提供的另一种背光控制电路的结构示意图；
图7为本申请实施例提供的再一种背光控制电路的结构示意图；
图8为本申请实施例提供的又一种背光控制电路的结构示意图；
图9为本申请实施例提供的又一种背光控制电路的结构示意图；
图10为本申请实施例提供的一种背光控制方法的流程示意图；
图11为本申请实施例提供的一种终端设备的结构示意图。
具体实施方式
本申请实施例可以应用于终端设备边充电边被使用的场景中，电源通过通用串行总线(Universal Serial Bus，USB)接口向终端设备的充电IC提供电压时，该电压可以为5V，9V，12V，20V等，终端设备的充电IC在接收到通过USB接口提供的电压时，可以通过充电IC的输入/输出接口为终端设备的电池充电，且在用户使用终端设备时，通过充电IC的输出端为背光模组提供电压，以控制背光模组的显示亮度，从而供用户使用。
其中，终端设备可以为具有充电功能，且具有屏幕显示功能的设备，例如手机、平板电脑、笔记本电脑、掌上电脑、可穿戴设备、车载终端，虚拟现实(Virtual Reality，VR)设备等。其中，可穿戴设备例如包括：智能手表、智能手环。示例的，以手机为例，手机在边充电边被使用的过程中，通常是通过提升背光电源的转换效率，以达到提高手机充电效率目的。在提升背光电源的转换效率时，是通过更换高效率的背光IC实现，但高效率的背光IC的价格较高，这样会增加手机的成本。为了实现在不增加成本的前提下，提高手机背光电源的转换效率，本申请实施例提供了一种背光控制电路，该背光控制电路包括充电电路、第一开关电路、第一调整电路及处理器；其中，充电电路包括第二调整电路；其中，充电电路的输入端与电源的输出端连接，充电电路的输入/输出端与电池连接，使得电源向手机的充电电路提供第一电压时，充电电路对电源输入的第一电压进行转换处理得到第二电压，并将第二电压输入至电池，以完成对电池的充电；此外，在为背光模组提供 所需电压，以控制背光模组的显示亮度时，将充电电路的预设端与第一开关电路的第一端连接，第一开关电路的第二端与处理器连接，第一开关电路的第三端与第一调整电路的输入端连接，第一调整电路的输出端与终端设备的背光模组连接；充电电路用于接收电源输入的第一电压，并将转换处理得到第二电压输入至电池；充电电路还用于通过预设端向第一开关电路输入预设电压，预设电压为未经过充电电路的第二调整电路调整的电压；处理器用于在检测到充电电路的输入端有电压时，控制第一开关电路导通；第一调整电路用于在第一开关电路导通时，根据背光模组的电压调整预设电压，并将调理得到的第三电压输入至背光模组，以通过第三电压控制背光模组的显示亮度，从而实现为背光模组提供所需电压，这样终端设备在边充电，边被使用时，从电源输出的第一电压到为背光模组提供的所需的第三电压的过程中，第一电压只经过第一调整电路的一次电源转换，从而提高了手机背光电源的转换效率。
其中，处理器可以为应用处理器(Application Processor，AP)或者中央处理器(Central Processing Unit，CPU)。示例的，当终端设备为手机或平板电脑时，该处理器可以为AP，当终端设备为笔记本电脑时，该处理器可以为CPU。
需要说明的是，在本申请实施例中，通过将充电电路的预设端与第一开关电路的第一端连接，以通过充电电路向第一开关电路输入预设电压时，该预设端可以通过两种不同的方式进行设置，在一种可能的实现方式中，该预设端可以为充电电路的第一输出端，该第一输出端为经过充电电路的MOS管和第二调整电路之间的端口。在另一种可能的实现方式中，该预设端可以为充电电路的输入端，即直接向第一开关电路输入电源输出端的电压，从而通过充电电路向第一开关电路输入预设电压。为了更清楚的描述本申请实施例提供的可能的技术方案，下面，将结合下述图1-图4对本申请实施例提供的背光控制电路的技术方案进行详细的描述。
在一种可能的实现方案中，预设端为充电电路的第一输出端，即当充电电路的第一输出端与第一开关电路的第一端连接时，请参见图1所示，图1为本申请实施例提供的一种背光控制电路的结构示意图，该背光控制电路可以包括：
充电电路、第一开关电路、第一调整电路及处理器；其中，充电电路包括第二调整电路；
其中，充电电路的输入端与电源的输出端连接，充电电路的输入/输出端与电池连接，充电电路的第一输出端与第一开关电路的第一端连接，第一开关电路的第二端与处理器连接，第一开关电路的第三端与第一调整电路的输入端连接，第一调整电路的输出端与终端设备的背光模组连接。
充电电路用于接收电源输入的第一电压，并将转换处理得到第二电压输入至电池。
充电电路还用于通过第一输出端向第一开关电路输入预设电压，预设电压为未经过充电电路的第二调整电路调整的电压。
处理器用于在检测到充电电路的输入端有电压时，控制第一开关电路导通。
第一调整电路用于在第一开关电路导通时，根据背光模组的电压调整预设电压，并将调理得到的第三电压输入至背光模组，以通过第三电压控制背光模组的显示亮度。
示例的，充电电路可以为Charge-IC。当充电电路可以为Charge-IC时，该充电电路还包括第一限流电路、第一MOS管、控制子电路及第二MOS管。其中，第一限流电路的输 入端与电源的输出端连接，第一限流电路的输出端分别与第一MOS管的第一端及控制子电路的第一端连接，MOS管的第二端与第二调整电路的第一端连接，第二调整电路的第二端分别与控制子模块的第二端及第二MOS管的第一端连接，第二MOS管的第二端与电池连接。示例的，电源可以为USB电源。
需要说明的是，当充电电路还包括第一限流电路、第一MOS管、控制子电路及第二MOS管时，本申请实施例中的第一输出端为MOS管的第二端和第二调整电路的第一端之间的输出端，即MOS管的第二端和第二调整电路的第一端分别通过第一输出端与第一开关电路连接，从而通过该第一输出端向第一开关电路输入预设电压。示例的，在本申请实施例中，该第一输出端可以为电源中间点(Power Midpoint，PMID)、中间点(Midpoint，MID)、USB中间点(Universal Serial Bus Midpoint，USB_MID)、充电电源中间点(Charge Voltage Midpoint，CHG_VMID)及电源中间点(Voltage Midpoint，VMID)中的任一种，当然，本申请实施例只是以上述几种为例进行说明，但并不代表本申请实施例仅局限于此。
可选的，第一开关电路可以为MOS管、三极管、晶体管及负载开关中的任一种，当然，也可以为其他具有该第一开关电路功能的电路，在此，本申请实施例只是以第一开关电路可以为MOS管、三极管、晶体管及负载开关中的任一种为例进行说明，但并不代表本申请实施例仅局限于此。
由此可见，本申请实施例提供的背光控制电路，在通过电源为充电电路提供电压时，充电电路输入端的第一电压先经过第一限流电路进行限流，并将限流后的电压中的一部分电压经过第二MOS管输入至电池，以实现为电池充电，此外，限流后的电压中的另一部分电压经过第一MOS管后，并通过第一MOS管和第二调整电路之间的第一输出端输入至第一开关电路，处理器在检测到充电电路的输入端有电压时，控制第一开关电路导通，使得第一调整电路在第一开关电路导通时，根据背光模组的电压调整预设电压，并将调理得到的第三电压输入至背光模组，以通过第三电压控制背光模组的显示亮度，从而实现为背光模组提供所需电压，这样终端设备在边充电，边被使用时，从电源输出的第一电压到为背光模组提供的所需的第三电压的过程中，第一电压只经过第一调整电路的一次电源转换，从而提高了手机背光电源的转换效率。
需要说明的是，第一调整电路可以为升压电路或降压电路，同样的，第二调整电路也可以为升压电路或降压电路。在实际充电应用过程中，当第二调整电路为降压电路时，第一调整电路为升压电路；或者，当第二调整电路为升压电路时，第一调整电路为降压电路。在OTG模式下，第二调整电路为升压电路时，第一调整电路也为升压电路。
在实际应用过程中，以第一调整电路为背光Boost电路，第二调整电路为Buck Boost电路，且电源输入的第一电压为5V为例，第一电压先经过第一MOS管进行转换，该第一MOS管的导通阻抗小于10mohm，以2A电流为例，经过第一MOS管转换后的电压为4.98V，并通过Buck Boost电路及第二MOS管向电池输入电压，以实现为电池充电，同时，通过PMID向第一开关电路输入电压，处理器在检测到Charge-IC输入端的4.98V电压时，说明当前正在通过电源为Charge-IC提供电压，此时，处理器控制第一开关电路导通，从而将该4.98V电压输入至背光Boost电路，当背光模组包括36颗灯珠(LED)，36颗灯珠的组成方式为每9颗串联成1组，再由4组并联形成背光模组结构，每颗灯珠所需电压为3V，则对应的应该为背光模组提供27V电压，由于当前电压只有4.98V，因此，需要先通过背 光Boost电路对4.98V电压进行升压处理，使得通过该背光Boost电路输出的电压为27V，并将该27V的电压输入至背光模组，以通过该27V电压控制背光模组的显示亮度，从而实现为背光模组提供所需电压，这样终端设备在边充电，边被使用时，从电源输出的5V电压到为背光模组提供的所需的27V电压的过程中，只经过第一调整电路的一次电源转换，从而提高了手机背光电源的转换效率。示例的，请参见表1所示：
表1
Figure PCTCN2018089768-appb-000001
结合上述表1可以看出，当通过电源向Charge-IC提供的电压为5V时，当采用高效率背光IC时，该电压经过Charge-IC的第一MOS管与第二调整电路之后，3.8V电压输入至背光模组，背光模组效率为88％，转换效率(转换效率等于充电IC效率*背光模组效率)为79.20％，VBL为27V，IBL为80mA，背光模组消耗的电流为545mA，转换效率收益为2.70％，功耗收益为20mA；当采用本申请实施例提供的背光控制电压时，该5V电压经过Charge-IC的第一MOS管之后，4.98V电压输入至背光模组，背光模组效率为88％，转换效率(转换效率等于充电IC效率*背光模组效率)为88.00％，VBL为27V，IBL为80mA，背光模组消耗的电流为490mA，转换效率收益为11.5％，功耗收益为75mA；由此可见，与现有技术相比，本申请实施例提供的背光控制电路的背光电源转换效率收益提高了8.80％，功耗收益提高了55mA，从而实现在为终端设备充电的同时，提高了终端设备背光电源的转换效率。
此外，需要说明的是，当通过PMID向第一开关电路输入电压时，由于从电源提供给背光模组的电流减少，使得实际进入电池的充电电流会增加，与现有技术中通过更换高效率背光IC相比，不仅降低了成本，而且提高了充电电流实际收益和充电时间收益。示例的，请参见下述表2所示：
表2
Figure PCTCN2018089768-appb-000002
Figure PCTCN2018089768-appb-000003
结合上述表2可以看出，当通过电源向Charge-IC提供的电流为2000mA时，当采用高效率背光IC时，该2000mA经过第一MOS管之后进行分流，其中，545mA的电流输入至背光模组，1455mA的电流经过Buck Boost电路及第二MOS管，并向电池输入至1723.03mA，且充电时间为167.15min，充电实际收益为23.68mA，充电时间收益为2.33min，充电电流实际收益为1.39％，充电时间收益为1.37％；当采用本申请实施例提供的背光控制电压时，该2000mA经过第一MOS管之后进行分流，其中，490mA的电流通过PMID输入至背光模组，1510mA的电流经过Buck Boost电路及第二MOS管，并向电池输入至1788.16mA，且充电时间为161.06min，充电实际收益为88.82mA，充电时间收益为8.42min，充电电流实际收益为5.22％，充电时间收益为4.97％；由此可见，与现有技术相比，本申请实施例提供的背光控制电路的充电电流实际收益提高了3.83％，充电时间收益提高了3.6％，从而实现在为终端设备充电的同时，提高了终端设备背光电源的转换效率。
上述图1所示的实施例详细描述了当预设端为充电电路的第一输出端时，本申请提供的背光控制电路的实现原理及有益效果。下面，将详细描述当预设端为充电电路的输入端时本申请提供的背光控制电路的实现原理及有益效果，请参见下述图2-图4所示：
在另一种可能的实现方案中，当充电电路的输入端与第一开关电路的第一端连接时，为了避免电源被烧坏，因此，第一开关电路为具有限流控制功能的开关电路，示例的，限流控制功能可以通过Fault管脚实现，请参见图2所示，图2为本申请实施例提供的另一种背光控制电路的结构示意图，该背光控制电路可以包括：
充电电路、第一开关电路、第一调整电路及处理器；其中，充电电路包括第二调整电路；
其中，充电电路的输入端与电源的输出端连接，充电电路的输入/输出端与电池连接，充电电路的输入端与第一开关电路的第一端连接，第一开关电路的第二端与处理器连接，第一开关电路的第三端与第一调整电路的输入端连接，第一调整电路的输出端与终端设备的背光模组连接。
充电电路用于接收电源输入的第一电压，并将转换处理得到第二电压输入至电池。
充电电路还用于通过输入端向第一开关电路输入预设电压(即为第一电压)，预设电压为未经过充电电路的第二调整电路调整的电压。
处理器用于在检测到充电电路的输入端有电压时，控制第一开关电路导通。
第一调整电路用于在第一开关电路导通时，根据背光模组的电压调整预设电压，并将调理得到的第三电压输入至背光模组，以通过第三电压控制背光模组的显示亮度。
示例的，充电电路可以为Charge-IC。当充电电路可以为Charge-IC时，该充电电路还包括第一限流电路、第一MOS管、控制子电路及第二MOS管。其中，第一限流电路的输入端与电源的输出端连接，第一限流电路的输出端分别与第一MOS管的第一端及控制子 电路的第一端连接，MOS管的第二端与第二调整电路的第一端连接，第二调整电路的第二端分别与控制子模块的第二端及第二MOS管的第一端连接，第二MOS管的第二端与电池连接。
可选的，第一开关电路可以为MOS管、三极管、晶体管及负载开关中的任一种，当然，也可以为其他具有该第一开关电路功能的电路，在此，本申请实施例只是以第一开关电路可以为MOS管、三极管、晶体管及负载开关中的任一种为例进行说明，但并不代表本申请实施例仅局限于此。
需要说明的是，在本申请实施例中，由于第一开关电路为具有限流控制功能的开关电路，因此，处理器在检测到充电电路的输入端有电压时，控制第一开关电路导通之前，可以通过第一开关电路先检测第一开关电路的第一端的第一电压，若第一开关电路的第一端的第一电压小于预设阈值，向处理器发送闭合请求信号，以使处理器根据闭合请求信号控制第一开关电路导通，从而通过电源向背光模组提供所需电压，这样使得从电源的第一电压到背光模组的第三电压只经过第一调整电路的一次电源转换，从而提高了手机背光电源的转换效率。
相反的，第一开关电路还用于若第一开关电路的第一端的第一电压大于预设阈值，向处理器发送中断请求信号；使得处理器在接收到该中断请求信号之后，根据中断请求信号控制第一开关电路断开，并逐级降低背光模组的亮度，直至处理器接收不到中断请求信号；或者根据中断请求信号控制降低背光模组的亮度，直至处理器接收不到中断请求信号，从而实现短路保护，避免充电器被烧坏。
由此可见，本申请实施例提供的背光控制电路，在通过电源为充电电路提供电压时，充电电路输入端的第一电压先经过第一限流电路进行限流，并将限流后的电压中的电压经过第二MOS管输入至电池，以实现为电池充电，此外，还可以通过充电电路的输入端(即电源的输出端)直接将第一电压输入至第一开关电路，处理器在检测到充电电路的输入端有电压，且第一开关电路的第一端的第一电压小于预设阈值时，控制第一开关电路导通，使得第一调整电路在第一开关电路导通时，根据背光模组的电压调整第一电压，并将调理得到的第三电压输入至背光模组，以通过第三电压控制背光模组的显示亮度，从而实现为背光模组提供所需电压，这样终端设备在边充电，边被使用时，从电源输出的第一电压到为背光模组提供的所需的第三电压的过程中，第一电压只经过第一调整电路的一次电源转换，从而提高了手机背光电源的转换效率。
需要说明的是，第一调整电路可以为升压电路或降压电路，同样的，第二调整电路也可以为升压电路或降压电路。在实际应用过程中，当第二调整电路为降压电路时，第一调整电路为升压电路；或者，当第二调理电话为升压电路时，第一调整电路为降压电路。
在实际应用过程中，同样以第一调整电路为背光Boost电路，第二调整电路为Buck Boost电路，且电源输入的第一电压为5V为例，以2A电流为例，第一电压先经过第一MOS管进行转换，该第一MOS管的导通阻抗小于10mohm，经过第一MOS管转换后的电压为4.98V，并通过Buck Boost电路及第二MOS管向电池输入电压，以实现为电池充电，同时，通过输入端向第一开关电路输入4.98V电压，处理器在检测到Charge-IC输入端的5V电压，且经过第一开关电路的电流小于预设阈值时，说明当前正在通过电源为Charge-IC提供电压，此时，处理器控制第一开关电路导通，从而将该4.98V电压输入至背 光Boost电路，当背光模组包括36颗灯珠(LED)，36颗灯珠的组成方式为每9颗串联成1组，再由4组并联形成背光模组结构，每颗灯珠所需电压为3V，则对应的应该为背光模组提供27V电压，由于当前电压只有5V，因此，需要先通过背光Boost电路对5V电压进行升压处理，使得通过该背光Boost电路输出的电压为27V，并将该27V的电压输入至背光模组，以通过该27V电压控制背光模组的显示亮度，从而实现为背光模组提供所需电压，这样终端设备在边充电，边被使用时，从电源输出的5V电压到为背光模组提供的所需的27V电压的过程中，只经过第一调整电路的一次电源转换，从而提高了手机背光电源的转换效率。同样的，当通过电源向Charge-IC提供的电流为2000mA时，通过现有技术中采用的高效率背光IC时或者采用本申请实施例提供的背光控制电路时，其充电电流实际收益和充电时间收益可参见上述表2及表2的相关描述，在此，本申请实施例不再进行赘述。
此外，需要说明的是，当充电电路的输入端与第一开关电路的第一端连接，且第一开关电路为不具有限流控制功能的开关电路，为了避免电源被烧坏，可以在充电电路的输入端与第一开关电路的第一端之间设置一个第二限流电路，请参见图3所示，图3为本申请实施例提供的再一种背光控制电路的结构示意图，该背光控制电路还可以包括：
第二限流电路的输入端与充电电路的输入端连接，第二限流电路的输出端与第一开关电路的第一端连接。
第二限流电路用于接收电源输入的第一电压，并对第一电压进行限流处理，得到预设电压。
在本申请实施例中，通过在充电电路的输入端与第一开关电路的第一端之间设置一个第二限流电路，使得可以通过该第二限流电路对通过电池输入端输入的第一电压先进行限流处理，例如，通过输入端输入的第一电压为5V，通过第二限流电路进行限流处理后得到4V的电压，并向第一开关电路输入4V电压，处理器在检测到Charge-IC输入端的5V电压时，说明当前正在通过电源为Charge-IC提供电压，此时，处理器控制第一开关电路导通，从而将该4V电压输入至背光Boost电路，当背光模组包括36颗灯珠(LED)，36颗灯珠的组成方式为每9颗串联成1组，再由4组并联形成背光模组结构，每颗灯珠所需电压为3V，则对应的应该为背光模组提供27V电压，由于当前电压只有4V，因此，需要先通过背光Boost电路对4V电压进行升压处理，使得通过该背光Boost电路输出的电压为27V，并将该27V的电压输入至背光模组，以通过27V电压控制背光模组的显示亮度，从而实现为背光模组提供所需电压，这样终端设备在边充电，边被使用时，从电源输出的5V电压到为背光模组提供的所需的27V电压的过程中，只经过第一调整电路的一次电源转换，从而提高了手机背光电源的转换效率。
可选的，第二限流电路包括过流检测电路、过温检测电路、与门及异常状态输出电路，请参见图4所示，图4为本申请实施例提供的又一种背光控制电路的结构示意图，该背光控制电路还可以包括：
其中，过流检测电路的第一端和过温检测电路的第一端均与充电电路的输入端连接，过流检测电路的第二端与与门的第一端连接，过温检测电路的第二端与与门的第二端连接，与门的第三端与异常状态输出电路的第一端连接，异常状态输出电路的第二端与第一开关电路的第一端连接。
当然，在本申请实施例中，只是以第二限流电路包括流检测电路、过温检测电路、与门及异常状态输出电路为例进行说明，也可以为其他形式的限流电路，在此，本申请实施例不做进一步地限制。
基于上述图1-图4任一项实施例所示的背光控制电路，当终端设备的输入端没有与电源连接，但终端设备的充电电路中有电压时，为了避免误切换导致的控制第一开关电路关闭并向背光模组提供所需电压，请参见图5所示，图5为本申请实施例提供的一种背光控制电路的结构示意图，以充电电路的第一输出端与第一开关电路的第一端连接为例，该背光控制电路还可以包括第二开关电路及开关控制电路。
其中，第二开关电路的第一端与充电电路的第二输出端连接，第二开关电路的第二端与处理器连接，第二开关电路的第三端与第一调整电路的输入端连接；开关控制电路的输入端与处理器连接，开关控制电路的输出端与第一开关电路的第三端连接。
处理器还用于在检测到充电电路的输入端无电压，且充电电路中有电压时，控制第二开关电路导通，并通过开关控制电路控制第一开关电路断开。
可选的，第二开关电路也可以为MOS管、三极管、晶体管及负载开关中的任一种，当然，也可以为其他具有该第一开关电路功能的电路，在此，本申请实施例只是以第一开关电路可以为MOS管、三极管、晶体管及负载开关中的任一种为例进行说明，但并不代表本申请实施例仅局限于此。
可选的，开关控制电路包括第一电阻、第二电阻及二极管；其中，第一电阻的一端与二极管的输出端连接，第二电阻的一端与二极管的输入端连接，第二电阻的另一端与处理器连接，二极管的输入端还与第一开关电路的第三端连接。
当然，上述开关控制电路中的二极管也可以用MOS管或三极管替换，即开关控制电路也可以包括第一电阻、第二电阻及MOS管，或者，开关控制电路也可以包括第一电阻、第二电阻及三极管。示例的，当开关控制电路也可以包括第一电阻、第二电阻及MOS管时，对应的请参见图6所示，图6为本申请实施例提供的另一种背光控制电路的结构示意图。
在本申请实施例中，通过设置第二开关电路及开关控制电路，使得当终端设备的输入端没有与电源连接，但终端设备的充电电路中有电压时，为了避免误切换导致的控制第一开关电路关闭并向背光模组提供所需电压，可以通过该开关控制电路控制第一开关电路断开，并控制第二开关电路导通，以在第二开关电路导通时，通过第一调整电路向背光模组输入所需电压，并通过输入的电压控制背光模组的显示亮度，从而实现边充电边向背光模组提供所需电压，以控制背光模组的显示亮度。需要说明的是，在控制第二开关电路导通时，并通过第一调整电路向背光模组输入所需电压时，可选的，为了防止电流过大，第二开关控制电路也可以为具有限流控制功能的开关电路。
需要说明的时，在本申请实施例中，在通过开关控制电路控制第一开关电路时，可以参见下述表3所示：
表3
状态 充电 USB OTG USB OTG 放电
GPIO3_USB_ID 1 0 0 1
GPIO2 1 1 0 0
EN状态 1 0 0 0
结合上述表3可以看出，GPIO3_USB_ID和GPIO2在硬件上可以组成或逻辑门，当其拉低时，对应的GPIO3_USB_ID设置为0，当GPIO3_USB_ID为0时，对应的第一开关电路的EN状态始终为0，第一开关电路断开，因此，可以避免误切换的发生，从而实现在终端设备的输入端没有与电源连接，但终端设备的充电电路中有电压时，可以通过该开关控制电路控制第一开关电路断开，并控制第二开关电路导通，以在第二开关电路导通时，通过第一调整电路向背光模组输入所需电压，并通过输入的电压控制背光模组的显示亮度，从而实现边充电边向背光模组提供所需电压，以控制背光模组的显示亮度。
当然，上述图5所示的实施例，以充电电路的第一输出端与第一开关电路的第一端连接为例详细说明了防止误切换的技术方案，当然，当充电电路的输入端与第一开关电路的第一端连接时，对应上述图2-图4所示，也可以相应的通过增加第二开关电路和开关控制电路实现防止无切换，请参见图7-图9所示，图7为本申请实施例提供的再一种背光控制电路的结构示意图，图8为本申请实施例提供的又一种背光控制电路的结构示意图，图9为本申请实施例提供的又一种背光控制电路的结构示意图。
图10为本申请实施例提供的一种背光控制方法的流程示意图，该背光控制方法可以应用于背光控制电路，背光控制电路包括充电电路、第一开关电路、第一调整电路及处理器，其中，充电电路包括第二调整电路，请参见图10所示，该背光控制方法可以包括：
S1001、充电电路接收电源输入的第一电压，并将转换处理得到第二电压输入至电池。
S1002、充电电路通过充电电路的预设端向第一开关电路输入预设电压，预设电压为未经过充电电路的第二调整电路调整的电压。
S1003、处理器在检测到充电电路的输入端有电压时，控制第一开关电路导通。
S1004、第一调整电路在第一开关电路导通时，根据背光模组的电压调整预设电压，并将调理得到的第三电压输入至背光模组，以通过第三电压控制背光模组的显示亮度。
由此可见，本申请实施例提供的背光控制方法，在通过电源为充电电路提供电压时，充电电路接收电源输入的第一电压，一方面将转换处理得到第二电压输入至电池，以实现为电池充电，另一方面通过充电电路的预设端向第一开关电路输入预设电压，预设电压为未经过充电电路的第二调整电路调整的电压；处理器在检测到充电电路的输入端有电压时，控制第一开关电路导通，使得第一调整电路在第一开关电路导通时，根据背光模组的电压调整预设电压，并将调理得到的第三电压输入至背光模组，以通过第三电压控制背光模组的显示亮度，从而实现为背光模组提供所需电压，这样终端设备在边充电，边被使用时，从电源输出的第一电压到为背光模组提供的所需的第三电压的过程中，第一电压只经过第一调整电路的一次电源转换，从而提高了手机背光电源的转换效率。
可选的，预设端为充电电路的第一输出端，充电电路包括第一限流电路，充电电路通过充电电路的预设端向第一开关电路输入预设电压，包括：
第一限流电路对第一预设电压进行限流处理，得到预设电压，并通过第一输出端向第一开关电路输入预设电压，从而防止电流过大导致充电器烧坏，实现对预设电压的限流控制。
可选的，预设端为充电电路的输入端，充电电路通过充电电路的预设端向第一开关电路输入预设电压，包括：
充电电路通过充电电路的输入端向第一开关电路输入预设电压。
可选的，背光控制电路包括第二限流电路，第一调整电路在第一开关电路导通时，根据背光模组的电压调整预设电压，并将调理得到的第三电压输入至背光模组之前，还包括：
第二限流电路接收电源输入的第一电压；并对第一电压进行限流处理，得到预设电压，使得可以通过该第二限流电路对通过电池输入端输入的第一电压先进行限流处理，从而防止电流过大导致充电器烧坏，实现对预设电压的限流控制。
可选的，第一开关电路为具有限流控制功能的开关电路，第一调整电路在第一开关电路导通时，根据背光模组的电压调整预设电压，并将调理得到的第三电压输入至背光模组之前，还包括：
第一开关电路检测第一开关电路的第一端的预设电压，若第一开关电路的第一端的预设电压小于预设阈值，向处理器发送闭合请求信号。
处理器还根据闭合请求信号控制第一开关电路导通，以向第一调整电路输入预设电压。
可选的，该背光控制方法还可以包括：
若第一开关电路的第一端的预设电压大于预设阈值，第一开关电路向处理器发送中断请求信号。
处理器根据中断请求信号控制第一开关电路断开，直至处理器接收不到中断请求信号。
可选的，该背光控制方法还可以包括：
若第一开关电路的第一端的预设电压大于预设阈值，向处理器发送中断请求信号。
处理器还用于根据中断请求信号控制降低背光模组的亮度，直至处理器接收不到中断请求信号。
可选的，背光控制电路还包括第二开关电路和开关将控制电路，该背光控制方法还可以包括：
当处理器检测到充电电路的输入端无电压，且充电电路中有电压时，控制第二开关电路导通，并通过开关控制电路控制第一开关电路断开，可以避免误切换的发生，从而实现在终端设备的输入端没有与电源连接，但终端设备的充电电路中有电压时，可以通过该开关控制电路控制第一开关电路断开，并控制第二开关电路导通，以在第二开关电路导通时，通过第一调整电路向背光模组输入所需电压，并通过输入的电压控制背光模组的显示亮度，从而实现边充电边向背光模组提供所需电压，以控制背光模组的显示亮度。
可选的，开关控制电路包括第一电阻、第二电阻及二极管，通过开关控制电路控制第一开关电路断开，包括：
处理器通过第一电阻、第二电阻及二极管控制第一开关电路断开。
其中，第一电阻的一端与二极管的输出端连接，第二电阻的一端与二极管的输入端连接，第二电阻的另一端与处理器连接，二极管的输入端还与第一开关电路连接。
本申请实施例所示的背光控制方法，可以执行上述任一项实施例所示的背光控制电路的技术方案，其实现原理以及有益效果类似，此处不再进行赘述。
图11为本申请实施例提供的一种终端设备的结构示意图，请参见图11所示，该终端设备可以包括电池、背光控制电路及背光模组。
其中，背光控制电路为上述任一实施例所示的背光控制电路。
本申请实施例所示的终端设备，可以执行上述任一项实施例所示的背光控制电路的技 术方案，其实现原理以及有益效果类似，此处不再进行赘述。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应以所述权利要求的保护范围为准。

Claims (25)

  1. 一种背光控制电路，其特征在于，包括：
    充电电路、第一开关电路、第一调整电路及处理器；其中，所述充电电路包括第二调整电路；
    其中，所述充电电路的输入端与电源的输出端连接，所述充电电路的输入/输出端与电池连接，所述充电电路的预设端与所述第一开关电路的第一端连接，所述第一开关电路的第二端与所述处理器连接，所述第一开关电路的第三端与所述第一调整电路的输入端连接，所述第一调整电路的输出端与终端设备的背光模组连接；
    所述充电电路用于接收所述电源输入的第一电压，并将转换处理得到第二电压输入至所述电池；
    所述充电电路还用于通过所述预设端向所述第一开关电路输入预设电压，所述预设电压为未经过所述第二调整电路调整的电压；
    所述处理器用于在检测到所述充电电路的输入端有电压时，控制所述第一开关电路导通；
    所述第一调整电路用于在所述第一开关电路导通时，根据所述背光模组的电压调整所述预设电压，并将调理得到的第三电压输入至所述背光模组，以通过所述第三电压控制所述背光模组的显示亮度。
  2. 根据权利要求1所述的电路，其特征在于，所述充电电路还包括第一限流电路、第一MOS管、控制子电路及第二MOS管；
    其中，所述第一限流电路的输入端与所述电源的输出端连接，所述第一限流电路的输出端分别与所述第一MOS管的第一端及所述控制子电路的第一端连接，所述MOS管的第二端与所述第二调整电路的第一端连接，所述第二调整电路的第二端分别与所述控制子模块的第二端及所述第二MOS管的第一端连接，所述第二MOS管的第二端与所述电池连接。
  3. 根据权利要求2所述的电路，其特征在于，
    所述预设端为所述充电电路的第一输出端，所述MOS管的第二端和所述第二调整电路的第一端分别通过所述第一输出端与所述第一开关电路连接。
  4. 根据权利要求1或2所述的电路，其特征在于，
    所述预设端为所述充电电路的输入端。
  5. 根据权利要求4所述的电路，其特征在于，还包括第二限流电路；
    其中，所述第二限流电路的输入端与所述充电电路的输入端连接，所述第二限流电路的输出端与所述第一开关电路的第一端连接；
    所述第二限流电路用于接收所述电源输入的所述第一电压，并对所述第一电压进行限流处理，得到所述预设电压。
  6. 根据权利要求4所述的电路，其特征在于，所述第一开关电路为具有限流控制功能的开关电路；
    所述第一开关电路还用于检测所述第一开关电路的第一端的预设电压，若所述第一开关电路的第一端的预设电压小于预设阈值，向所述处理器发送闭合请求信号；
    所述处理器还用于根据所述闭合请求信号控制所述第一开关电路导通。
  7. 根据权利要求6所述的电路，其特征在于，
    所述第一开关电路还用于若所述第一开关电路的第一端的预设电压大于所述预设阈值，向所述处理器发送中断请求信号；
    所述处理器还用于根据所述中断请求信号控制所述第一开关电路断开，直至所述处理器接收不到所述中断请求信号。
  8. 根据权利要求6所述的电路，其特征在于，
    所述第一开关电路还用于若所述第一开关电路的第一端的预设电压大于所述预设阈值，向所述处理器发送中断请求信号；
    处理器还用于根据所述中断请求信号控制降低背光模组的亮度，直至所述处理器接收不到所述中断请求信号。
  9. 根据权利要求1-8任一项所述的电路，其特征在于，还包括第二开关电路及开关控制电路；
    其中，所述第二开关电路的第一端与所述充电电路的第二输出端连接，所述第二开关电路的第二端与所述处理器连接，所述第二开关电路的第三端与所述第一调整电路的输入端连接；所述开关控制电路的输入端与所述处理器连接，所述开关控制电路的输出端与所述第一开关电路的第三端连接；
    所述处理器还用于在检测到所述充电电路的输入端无电压，且所述充电电路中有电压时，控制所述第二开关电路导通，并通过所述开关控制电路控制所述第一开关电路断开。
  10. 根据权利要求9所述的电路，其特征在于，所述开关控制电路包括第一电阻、第二电阻及二极管；
    其中，所述第一电阻的一端与所述二极管的输出端连接，所述第二电阻的一端与所述二极管的输入端连接，所述第二电阻的另一端与所述处理器连接，所述二极管的输入端还与所述第一开关电路的第三端连接。
  11. 根据权利要求5所述的电路，其特征在于，所述第二限流电路包括过流检测电路、过温检测电路、与门及异常状态输出电路；
    其中，所述过流检测电路的第一端和所述过温检测电路的第一端均与所述充电电路的输入端连接，所述过流检测电路的第二端与所述与门的第一端连接，所述过温检测电路的第二端与所述与门的第二端连接，所述与门的第三端与所述异常状态输出电路的第一端连接，所述异常状态输出电路的第二端与所述第一开关电路的第一端连接。
  12. 根据权利要求1-11任一项所述的电路，其特征在于，
    当所述第二调整电路为降压电路时，所述第一调整电路为升压电路；或者，当所述第二调理电话为升压电路时，所述第一调整电路为降压电路。
  13. 根据权利要求3所述的电路，其特征在于，
    所述第一输出端为电源中间点PMID、中间点MID、USB中间点USB_MID、充电电源中间点CHG_VMID及电源中间点VMID中的任一种。
  14. 根据权利要求9或10所述的电路，其特征在于，所述第二开关电路为具有限流控制功能的开关电路。
  15. 根据权利要求1-14任一项所述的电路，其特征在于，
    所述第一开关电路为MOS管、三极管、晶体管及负载开关中的任一种。
  16. 一种背光控制方法，其特征在于，应用于背光控制电路，所述背光控制电路包括充电电路、第一开关电路、第一调整电路及处理器，其中，所述充电电路包括第二调整电路，所述方法包括：
    所述充电电路接收电源输入的第一电压，并将转换处理得到第二电压输入至电池；
    所述充电电路通过所述充电电路的预设端向所述第一开关电路输入预设电压，所述预设电压为未经过所述充电电路的第二调整电路调整的电压；
    所述处理器在检测到所述充电电路的输入端有电压时，控制所述第一开关电路导通；
    所述第一调整电路在所述第一开关电路导通时，根据所述背光模组的电压调整所述预设电压，并将调理得到的第三电压输入至所述背光模组，以通过所述第三电压控制所述背光模组的显示亮度。
  17. 根据权利要求16所述的方法，其特征在于，所述预设端为所述充电电路的第一输出端，所述充电电路包括第一限流电路，所述充电电路通过所述充电电路的预设端向所述第一开关电路输入预设电压，包括：
    所述第一限流电路对所述第一预设电压进行限流处理，得到所述预设电压，并通过所述第一输出端向所述第一开关电路输入预设电压。
  18. 根据权利要求16所述的方法，其特征在于，所述预设端为所述充电电路的输入端，所述充电电路通过所述充电电路的预设端向所述第一开关电路输入预设电压，包括：
    所述充电电路通过所述充电电路的输入端向所述第一开关电路输入所述预设电压。
  19. 根据权利要求18所述的方法，其特征在于，所述背光控制电路包括第二限流电路，所述第一调整电路在所述第一开关电路导通时，根据所述背光模组的电压调整所述预设电压，并将调理得到的第三电压输入至所述背光模组之前，还包括：
    所述第二限流电路接收所述电源输入的第一电压；并对所述第一电压进行限流处理，得到所述预设电压。
  20. 根据权利要求18所述的方法，其特征在于，所述第一开关电路为具有限流控制功能的开关电路，所述第一调整电路在所述第一开关电路导通时，根据所述背光模组的电压调整所述预设电压，并将调理得到的第三电压输入至所述背光模组之前，还包括：
    所述第一开关电路检测所述第一开关电路的第一端的预设电压，若所述第一开关电路的第一端的预设电压小于预设阈值，向所述处理器发送闭合请求信号；
    所述处理器还根据所述闭合请求信号控制所述第一开关电路导通，以向所述第一调整电路输入所述预设电压。
  21. 根据权利要求20所述的方法，其特征在于，还包括：
    若所述第一开关电路的第一端的预设电压大于所述预设阈值，所述第一开关电路向所述处理器发送中断请求信号；
    所述处理器根据所述中断请求信号控制所述第一开关电路断开，直至所述处理器接收不到所述中断请求信号。
  22. 根据权利要求20所述的方法，其特征在于，还包括：
    若所述第一开关电路的第一端的预设电压大于所述预设阈值，向所述处理器发送中断请求信号；
    处理器还用于根据所述中断请求信号控制降低背光模组的亮度，直至所述处理器接收 不到所述中断请求信号。
  23. 根据权利要求16-22任一项所述的方法，其特征在于，所述背光控制电路还包括第二开关电路和开关将控制电路，所述方法还包括：
    当所述处理器检测到所述充电电路的输入端无电压，且所述充电电路中有电压时，控制所述第二开关电路导通，并通过所述开关控制电路控制所述第一开关电路断开。
  24. 根据权利要求23所述的方法，其特征在于，所述开关控制电路包括第一电阻、第二电阻及二极管，所述通过所述开关控制电路控制所述第一开关电路断开，包括：
    所述处理器通过所述第一电阻、所述第二电阻及所述二极管控制所述第一开关电路断开；
    其中，所述第一电阻的一端与所述二极管的输出端连接，所述第二电阻的一端与所述二极管的输入端连接，所述第二电阻的另一端与所述处理器连接，所述二极管的输入端还与所述第一开关电路连接。
  25. 一种终端设备，其特征在于，包括电池、背光控制电路及背光模组；
    其中，所述背光控制电路为上述权利要求1-15任一项所述的背光控制电路。
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US20150264775A1 (en) * 2014-03-14 2015-09-17 Soethiha Soe Display backlight power consumption
CN107508339A (zh) * 2017-08-11 2017-12-22 维沃移动通信有限公司 一种充电电路及移动终端

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CN103855760A (zh) * 2012-11-28 2014-06-11 瑞萨电子株式会社 半导体集成电路及其操作方法
US20150264775A1 (en) * 2014-03-14 2015-09-17 Soethiha Soe Display backlight power consumption
CN107508339A (zh) * 2017-08-11 2017-12-22 维沃移动通信有限公司 一种充电电路及移动终端

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