WO2015070641A1 - 一种供电装置和电子设备 - Google Patents

一种供电装置和电子设备 Download PDF

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Publication number
WO2015070641A1
WO2015070641A1 PCT/CN2014/083221 CN2014083221W WO2015070641A1 WO 2015070641 A1 WO2015070641 A1 WO 2015070641A1 CN 2014083221 W CN2014083221 W CN 2014083221W WO 2015070641 A1 WO2015070641 A1 WO 2015070641A1
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Prior art keywords
voltage
voltage signal
power supply
signal
supply device
Prior art date
Application number
PCT/CN2014/083221
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English (en)
French (fr)
Inventor
解红军
Original Assignee
京东方科技集团股份有限公司
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Application filed by 京东方科技集团股份有限公司 filed Critical 京东方科技集团股份有限公司
Priority to US14/416,041 priority Critical patent/US9345102B2/en
Publication of WO2015070641A1 publication Critical patent/WO2015070641A1/zh

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/60—Circuit arrangements for operating LEDs comprising organic material, e.g. for operating organic light-emitting diodes [OLED] or polymer light-emitting diodes [PLED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • 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
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • H02J7/04—Regulation of charging current or voltage
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the Active Matrix Organic Light Emitting Diode (AMOLED) display device Compared with the conventional thin film transistor liquid crystal display, the Active Matrix Organic Light Emitting Diode (AMOLED) display device has a more brilliant color and a wider color gamut.
  • AMOLED Active Matrix Organic Light Emitting Diode
  • three electrical signals (electric signals for the electroluminescent sheet EL, electrical signals for calculation or logic operation, and electrical signals for the system) are required, as shown in Fig. 1, respectively, for the VCC signal (in the figure) Not shown), ELVDD signal and ELVSS signal.
  • the above three signals are respectively generated by different power supply structures.
  • Each of the above signals requires a respective DC-DC (DC-DC) conversion unit, and the efficiency of the existing DC-DC conversion unit is generally about 85%, and the loss during the conversion is distributed in the form of heat. Go out.
  • This part of the power consumption is also included in the overall power consumption of the entire electronic device. Therefore, the more DC-DC conversion units in the entire power supply structure, the higher the overall power consumption of the device.
  • An object of the embodiments of the present invention is to provide a power supply device and an electronic device, which improve the power supply rate and reduce the overall power consumption of the device.
  • an embodiment of the present invention provides a power supply device that outputs a first DC voltage signal having a first voltage and a second DC voltage signal having a second voltage to a load, and the power supply device specifically includes:
  • An AC-DC conversion unit for providing a source DC voltage signal
  • a first DC-DC converting unit configured to generate the first DC voltage signal and the second DC voltage signal according to the source DC voltage signal, and output the first DC voltage signal to the load through a first output interface And outputting a second DC voltage signal to the load through the second output interface;
  • the reference voltage signal generating unit is configured to generate the reference voltage signal by using the first DC voltage signal and the second DC voltage signal as an input signal, and output The reference voltage signal is to the load, and the voltage value of the reference voltage signal is smaller than a voltage value of the first DC voltage signal and greater than a voltage value of the second DC voltage signal.
  • the power supply device further includes a second DC-DC conversion unit
  • the reference voltage signal generating unit is further configured to output the reference voltage signal to the second DC-DC conversion unit
  • the second DC The DC conversion unit is specifically configured to generate a third DC voltage signal according to the source DC voltage signal and the reference voltage signal, and output the third DC voltage signal to the load, for the logic circuit of the load to enable.
  • the reference voltage generating unit specifically includes:
  • a voltage divider is connected between the first output interface and the second output interface, the voltage divider has a voltage dividing node, and the voltage value of the voltage dividing node is located at a voltage value of the first DC voltage signal and Between the voltage values of the second DC voltage signal;
  • a voltage follower coupled to the voltage dividing node, to generate the reference voltage signal that follows a voltage value of the voltage dividing node.
  • the voltage follower is an operational amplifier, and a non-inverting input terminal of the operational amplifier is electrically connected to the voltage dividing node, and an inverting input end of the operational amplifier and an output end of the operational amplifier are electrically Connected, the forward power terminal of the operational amplifier is electrically connected to the first output interface, and the reverse power terminal of the operational amplifier is electrically connected to the second output interface.
  • the voltage divider includes a first resistor and a second resistor connected in series, and the voltage dividing node is disposed between the first resistor and the second resistor.
  • the power supply device further includes:
  • control unit configured to control a resistance of the adjustable resistor to control a voltage value of the reference voltage signal output by the voltage follower.
  • an embodiment of the present invention further provides an electronic device including a load and the above-mentioned power supply device.
  • the load is an active matrix organic light emitting diode display panel.
  • the first DC voltage signal generated by the power supply device is an ELVDD signal that drives electroluminescence of the active matrix organic light emitting diode display panel; the second DC voltage signal generated by the power supply device is a driving station.
  • the ELVSS signal of the electroluminescence of the active matrix organic light emitting diode display panel; the reference voltage signal generated by the power supply device is a GND signal.
  • the third DC voltage signal generated by the power supply device is a VCC signal that drives a logic circuit of the active matrix organic light emitting diode display panel.
  • the embodiment of the present invention for a load requiring a positive voltage and a negative voltage, two power supply signals having different voltage values are first generated, and then the two power supply signals are used to generate a reference voltage whose voltage value is between the voltage values of the two.
  • the signal is provided to the load such that the load can determine a positive voltage signal and a negative voltage signal based on the reference voltage signal.
  • the embodiment of the present invention reduces the number of DC-DC conversion units, thereby improving power supply efficiency. , reducing the overall equipment
  • FIG. 1 is a circuit diagram of a pixel unit of an AMOLED panel
  • FIG. 2 is a schematic structural view of a power supply device according to an embodiment of the present invention.
  • FIG. 3 is a circuit diagram showing a reference electrical signal generating unit of an embodiment of the present invention.
  • FIG. 4 is a block diagram showing the structure of an electronic device using the reference electrical signal generating unit shown in FIG. 3 according to an embodiment of the present invention.
  • two power supply signals having different voltage values are first generated, and then the two power supply signals are used to generate a reference between the voltage values of the two voltage values.
  • the voltage signal is supplied to the load such that the load can determine a positive voltage signal and a negative voltage signal based on the reference voltage signal.
  • the embodiment of the present invention reduces the number of D DC converting units, thereby improving power supply efficiency and reducing equipment. Overall power consumption.
  • the voltage value at a certain point in the circuit is determined with respect to a reference voltage, and the so-called positive voltage and negative voltage are also determined with respect to a reference voltage.
  • the voltage value of the positive voltage signal is greater than the voltage value of the reference voltage signal, and the voltage value of the negative voltage signal is less than the voltage value of the reference voltage signal.
  • the above voltage value is a voltage obtained by using the earth as a reference voltage.
  • two voltage signals with different voltage values generated by the DC-DC are used to generate a reference voltage signal with a voltage value between the two, and output to the load, and the load can be obtained according to the obtained Three voltage signals work.
  • the power supply device of the embodiment of the present invention is configured to output a first DC voltage signal having a first voltage and a second DC voltage signal having a second voltage to the load. As shown in FIG. 2, the power supply device includes:
  • An AC-DC conversion unit for providing a source DC voltage signal
  • a first DC-DC conversion unit configured to generate the first DC voltage signal and the second DC voltage signal according to the source DC voltage signal, and output the first DC voltage signal to the load through a first output interface And outputting the second DC voltage signal to the load through a second output interface;
  • the reference voltage signal generating unit is configured to use the first DC voltage signal and the second DC voltage signal as an input signal to generate a reference voltage signal, And outputting the reference voltage signal to the load, the voltage value of the reference voltage signal is less than a voltage value of the first DC voltage signal, and ⁇ is greater than a voltage value of the second DC voltage signal.
  • the embodiment of the present invention for a load that requires at least one positive voltage and at least one negative voltage, Firstly, two power supply signals having different voltage values are generated, and then the reference voltage signals whose voltage values are between the voltage values of the two power supply signals are used to be supplied to the load, so that the load can determine a positive according to the reference voltage signal. Voltage signal and a negative voltage signal.
  • the embodiment of the present invention reduces the number of DC-DC conversion units, thereby improving power supply efficiency and reducing The overall power consumption of the device also reduces product costs.
  • the power supply device of the embodiment of the present invention can be used in various occasions.
  • the load is an active matrix organic light emitting diode display panel.
  • LCD TVs use TF LCD as the display panel, backlight module as the light source of TF LCD, and the display light source of LCD TV.
  • the AMOLED panel is a self-illuminating display panel, the backlight module is no longer needed.
  • the display panel has an electroluminescent component that requires a large current to produce a matrix-controlled light source, thereby forming a patterned display. Therefore, an electroluminescent power source, that is, an EL power source, is required in an AMOLED television.
  • the prior art uses three independent DC-DC conversion units to provide the above three voltage signals.
  • the two voltage signals ELVDD and ELVSS can be generated by one DC-DC conversion unit, thereby reducing a DC DC conversion unit relative to the prior art, thereby reducing cost and reducing equipment. Overall power consumption.
  • the power supply device of the embodiment of the present invention further includes a second DC-DC conversion unit, wherein the reference voltage signal generating unit is further configured to output the reference voltage signal to the second DC-DC conversion unit.
  • the second DC-DC conversion unit is specifically configured to generate a third DC voltage signal according to the source DC voltage signal and the reference voltage signal, and output the third DC voltage signal to the load for use by a logic circuit of the load.
  • the power supply structure of the embodiment of the present invention includes a reference voltage signal generating unit whose function is to generate an electrical signal between the voltages of the two DC voltage signals, that is, the voltage of the reference voltage signal is smaller than the first DC voltage signal. Voltage, and greater than The voltage of the second DC voltage signal.
  • the reference voltage generating unit described above may be implemented in various manners. One of the following implementations is described below, but the specific embodiments of the present invention are not limited to the following implementations.
  • the reference voltage generating unit specifically includes:
  • a voltage divider connected between the first output interface and the second output interface, the voltage divider has a voltage dividing node, the voltage value of the voltage dividing node is located at a voltage value of the first DC voltage signal, and a second Between DC voltage signals;
  • a voltage follower connected to the voltage dividing node of the voltage divider for generating the reference voltage signal whose voltage value follows the voltage value of the voltage dividing node.
  • the above structure utilizes a voltage dividing function of the voltage divider to divide a voltage value into a signal between the voltage value of the first DC voltage signal and the second DC voltage signal, and further generate a voltage value following by using a voltage follower.
  • the reference voltage signal of the voltage value of the voltage node is realized.
  • the reference voltage signal output by the voltage follower is output to the load and the second DC-DC conversion unit, and the reference voltage signal is transmitted between the voltage follower and the load and the second DC-DC conversion unit. It is maintained by current, so the voltage follower requires a certain driving capability.
  • an independent voltage source can be provided for the voltage follower, but in order to simplify the circuit structure, in the specific embodiment of the present invention, the two voltage signals output by the first DC-DC converting unit are directly used for driving. .
  • the voltage follower implemented by the above implementation is an operational amplifier. As shown in FIG. 3, the non-inverting input terminal of the operational amplifier is electrically connected to the voltage dividing node P, and the inverting input terminal of the operational amplifier and the operation An output terminal of the amplifier is electrically connected, a forward power terminal of the operational amplifier is electrically connected to the first output interface, and a reverse power terminal of the operational amplifier is electrically connected to the second output interface.
  • the positive and negative power terminals of the operational amplifier are connected to two voltage signals output by the first DC-DC conversion unit, and the two signals need to be output to the AMOLED panel to drive the OLED, it is quite good. Stability and driveability. That is to say, the output current of the operational amplifier is provided by the first DC-DC conversion unit, so that it has a certain driving capability.
  • the reference voltage signal can be transmitted to the load and the second DC-DC conversion unit.
  • the voltage divider of the embodiment of the present invention may include a first electric ffi R1 and a second electric resistance R2 connected in series, and the voltage dividing node P is disposed on the first resistor R1 and the second resistor R2. between.
  • a voltage divider formed by a series resistor can easily adjust the voltage value of the reference voltage signal as explained below.
  • the voltage of the node P is (the voltage value of ELVDD - the voltage value of ELVSS) Rl / (RRR2), and therefore, any one of R1 and R2 can be changed.
  • the voltage value of the reference voltage signal is changed, and once the voltage value of the reference voltage signal changes, the voltage difference between the ELVDD signal/ELVSS signal and the reference voltage signal changes, that is, the positive and negative voltages change.
  • the above resistor may be determined before the power supply design, but at least one of the first resistor and the second resistor may also be set as an adjustable resistor.
  • a control unit is added to the power supply device. The control unit controls the resistance of the adjustable resistor to control the voltage value of the reference voltage signal output by the voltage follower.
  • This method is more convenient to use. Even if the product changes during use, it can be adjusted at any time when the positive and negative voltage changes are needed, which improves the adaptability and service life of the product.
  • An embodiment of the present invention further provides an electronic device including a load and any of the foregoing power supply devices.
  • the load can be an active matrix organic light emitting diode display panel.
  • the first DC voltage signal generated by the power supply device is an ELVDD signal that drives electroluminescence of the active matrix organic light emitting diode display panel;
  • the second DC voltage signal is an ELVSS signal that drives electroluminescence of the active matrix organic light emitting diode display panel;
  • the reference voltage signal generated by the power supply device is a GND signal.
  • the GND signal is a reference signal and is not necessarily a signal connected to the earth.
  • the third DC voltage signal generated by the power supply device is a VCC signal for driving a logic circuit of the active matrix organic light emitting diode display panel.
  • An electronic device includes a load and a power supply device for outputting a first DC voltage signal having a first voltage and a second DC voltage signal having a second voltage to the load, where the power supply device specifically includes:
  • An AC-DC conversion unit the ffi is provided with a source DC voltage signal
  • a first DC-DC conversion unit configured to generate the first DC voltage signal and the second DC voltage signal according to the source DC voltage signal, and output the first through the first output interface and the second output interface respectively a DC voltage signal and a second DC voltage signal to the load;
  • a reference voltage signal generating unit configured to generate a reference voltage signal by using the first DC voltage signal and the second DC voltage signal as an input signal, and output the reference voltage signal to the load, the voltage of the reference voltage signal The value is less than the voltage value of the first DC voltage signal and greater than the voltage value of the second DC voltage signal.
  • the load is an active matrix organic light emitting diode display panel.
  • the power supply device further includes a second DC-DC conversion unit
  • the reference voltage signal generating unit is further configured to output the reference voltage signal to the second DC-DC conversion unit
  • the second The DC-DC conversion unit is specifically configured to generate a third DC voltage signal according to the source DC voltage signal and the reference voltage signal, and output the third DC voltage signal to the load, for the logic circuit of the load to enable.
  • the reference voltage generating unit specifically includes:
  • a voltage divider is connected between the first output interface and the second output interface, the voltage divider has a voltage dividing node, and the voltage value of the voltage dividing node is located at a voltage value of the first DC voltage signal and Between the voltage values of the second DC voltage signal;
  • a voltage follower coupled to the voltage dividing node, is configured to generate a reference voltage signal whose voltage value follows the voltage value of the voltage dividing node.
  • the voltage follower is an operational amplifier, and a non-inverting input terminal of the operational amplifier is electrically connected to the voltage dividing node, and an inverting input end of the operational amplifier and an output end of the operational amplifier are electrically Connected, the forward power terminal of the operational amplifier is electrically connected to the first output interface, and the reverse power terminal of the operational amplifier is electrically connected to the second output interface.
  • the voltage divider includes a first resistor and a second resistor connected in series, The voltage dividing node is disposed between the first resistor and the second resistor.
  • the power supply device further includes: a control unit configured to control a resistance of the adjustable resistor to control a voltage value of the reference voltage signal output by the voltage follower.
  • FIG. 4 it is a schematic structural diagram of an electronic device according to an embodiment of the present invention, wherein voltage is divided by resistors R l and R2 to generate a potential between ELVDD and ELVSS outputted by the first DC-DC conversion unit. Then, a voltage follower is connected, which is implemented by an operational amplifier circuit, thereby realizing a potential generating circuit. Since the positive and negative power supplies of the operational amplifier in the potential generating circuit are electrically connected to the voltage signals ELVDD and ELVSS, respectively, the current outputted by the circuit is supplied by the voltage signals ELVDD and ELVSS, and has a certain driving capability. The output of the circuit is connected to the GND of the logic circuit, and is connected to the GND of the second DC-DC conversion unit of the output VCC to form a common reference potential.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

一种供电装置和电子设备，该供电装置用于向一负载输出具有第一电压的第一直流电压信号和具有第二电压的第二直流电压信号，所述供电装置包括：交流-直流转换单元，用于提供源直流电压信号；第一直流-直流转换单元，用于根据所述源直流电压信号生成第一直流电压信号和第二直流电压信号，并通过第一输出接口输出所述第一直流电压信号到所述负载，通过第二输出接口输出所述第二直流电压信号到所述负载；参考电压信号生成单元，用于利用第一直流电压信号和第二直流电压信号作为输入信号，生成参考电压信号，并输出参考电压信号到所述负载，其中，参考电压信号的电压值小于所述第一直流电压信号的电压值，且大于所述第二直流电压信号的电压值。该供电装置和电子设备提高了电源效率。

Description

一种供电装置和电子设备
本申请主张在 2013 年 1】 月 12 日在中国提交的中国专利申请号 No. 201310559854.9的优先权， 其全部内容通过引用包含于此。
Figure imgf000002_0001
相比于传统的薄膜晶体管液晶显示器， 有源矩阵有机发光二极管 (Active Matrix Organic Light Emitting Diode, AMOLED) 显示装置色彩更加绚丽， 色 域更宽。
为驱动 AMOLED面板， 需要 3个电信号（为电致发光片 EL供电的电信 号、 为计算或逻辑运算供电和为系统供电的电信号）， 如图 1 所示， 分别为 VCC信号 （图中未示出）、 ELVDD信号和 ELVSS信号。
现有技术中， 上述 3个信号分别由不同的电源结构产生。 而产生上述每 个信号都需要各自的 DC- DC (直流-直流） 转换单元， 而现有的 DC- DC转换 单元的效率一般都在 85%左右，转换过程中的损耗都以热量的形式散发出去。 这部分的电能消耗也是包含在整个电子设备的整机功耗里面的。 因此， 整个 供电结构中的 DC- DC转换单元越多， 则设备整体的功耗越高。
虽然上述是以 AMOLED面板为例说明了现有技术中存在功耗过高 /电源 效率过低的问题。 但应当理解的是， 其他的单独生成正电压和负电压的电源 结构都存在上述的问题， 在此不一一列举。
本发明实施例的目的在于提供一种供电装置和电子设备， 提高供电的 率， 降低设备的整体功耗。 为了实现上述目的， 本发明实施例提供了一种供电装置， ^于向负载输 出具有第一电压的第一直流电压信号和具有第二电压的第二直流电压信号， 所述供电装置具体包括：
交流直流转换单元， ^于提供源直流电压信号；
第一直流直流转换单元， 用于根据所述源直流电压信号生成所述第一直 流电压信号和第二直流电压信号， 并通过第一输出接口输出所述第一直流电 压信号到所述负载， 通过第二输出接口输出第二直流电压信号到所述负载； 参考电压信号生成单元， 用于利用所述第一直流电压信号和第二直流电 压信号作为输入信号， 生成参考电压信号， 并输出所述参考电压信号到所述 负载， 所述参考电压信号的电压值小于所述第一直流电压信号的电压值， 且 大于所述第二直流电压信号的电压值。
在一个示例中， 所述供电装置还包括第二直流直流转换单元， 所述参考 电压信号生成单元还用于输出所述参考电压信号到所述第二直流-直流转换 单元， 所述第二直流-直流转换单元具体用于根据所述源直流电压信号和参考 电压信号生成第三直流电压信号，并输出所述第三直流电压信号到所述负载， 供负载的逻辑电路使) ¾。
在一个示例中， 所述参考电压生成单元具体包括：
分压器， 连接于所述第一输出接口和第二输出接口之间， 所述分压器具 有分压节点， 所述分压节点的电压值位于所述第一直流电压信号的电压值和 所述第二直流电压信号的电压值之间；
电压跟随器， 与所述分压节点连接， ）¾于生成电压值跟随所述分压节点 的电压值的所述参考电压信号。
在一个示例中， 所述电压跟随器为运算放大器， 所述运算放大器的正相 输入端与所述分压节点电连接， 所述运算放大器的反相输入端与所述运算放 大器的输出端电连接， 所述运算放大器的正向电源端与所述第一输出接口电 连接， 所述运算放大器的反向电源端与所述第二输出接口电连接。
在一个示例中， 所述分压器包括串联连接的第一电阻和第二电阻， 所述 分压节点设置于所述第一电阻和第二电阻之间。
在一个示例中， 所述第一电阻和第二电阻中的至少一个为可调电阻。 在一个示例中， 所述供电装置还包括：
控制部， 用于控制所述可调电阻的阻值， 以控制电压跟随器输出的所述 参考电压信号的电压值。
为了更好的实现上述目的， 本发明实施例还提供了一种电子设备， 包括 负载和上述的供电装置。
在一个示例中， 所述负载为有源矩阵有机发光二极管显示面板。
在一个示例中， 所述供电装置生成的第一直流电压信号是驱动所述有源 矩阵有机发光二极管显示面板的电致发光的 ELVDD信号； 所述供电装置生 成的第二直流电压信号是驱动所述有源矩阵有机发光二极管显示面板的电致 发光的 ELVSS信号； 所述供电装置生成的参考电压信号是 GND信号。
在一个示例中， 所述供电装置生成的第三直流电压信号是驱动所述有源 矩阵有机发光二极管显示面板的逻辑电路的 VCC信号。
本发明实施例具有以下有益效果：
本发明实施例中， 对于需要一个正电压和一个负电压的负载， 首先生成 两个电压值不同的供电信号， 进而利用这两个供电信号生成电压值位于二者 的电压值之间的参考电压信号提供给负载， 使得负载能够依据该参考电压信 号来确定出一个正电压信号和一个负电压信号。 相对于现有技术的利) ¾两个 DC-DC转换单元来分别生成一个正电压和一个负电压的方式而言， 本发明实 施例减少了 DC- DC转换单元的数量， 因此能够提高供电效率， 降低设备的整
图 1表示 AMOLED面板像素单元的电路图；
图 2表示本发明实施例的供电装置的结构示意图；
图 3表示本发明实施例的参考电信号生成单元的电路图；
图 4表示本发明实施例使用图 3所示的参考电信号生成单元的电子设备 的结构示意图。 本发明实施例中， 对于需要一个正电压和一个负电压的负载， 首先生成 两个电压值不同的供电信号， 进而利用这两个供电信号生成一个电压值位于 二者的电压值之间的参考电压信号提供给负载， 使得负载能够依据该参考电 压信号来确定出一个正电压信号和一个负电压信号。 相对于现有技术中利用 两个 DC- DC转换单元来分别生成一个正电压和一个负电压的方式而言，本发 明实施例减少了 D DC转换单元的数量， 因此能够提高供电效率， 降低设备 的整体功耗。
在对本发明实施例进行详细说明之前， 先对本发明实施例的某些概念说 明如下， 以便于更好的理解本发明实施例。
一般而言， 电路中某一点的电压值都是相对于一个参考电压而确定的， 同时， 所谓的正电压、 负电压也是相对于一个参考电压而确定的。
正电压信号的电压值大于参考电压信号的电压值， 而负电压信号的电压 值小于参考电压信号的电压值。
在很多情况下， 上述电压值是以大地为参考电压得到的电压。
在本发明的具体实施例中，利用 DC- DC生成的两个电压值不同的电压信 号来生成一个电压值介于二者之间的参考电压信号， 并输出给负载， 而负载 可以根据得到的 3个电压信号进行工作。
本发明实施例的供电装置， 用于向负载输出具有第一电压的第一直流电 压信号和具有第二电压的第二直流电压信号， 如图 2所示， 所述供电装置具 体包括：
交流-直流 （AC- DC) 转换单元， 用于提供源直流电压信号；
第一直流-直流转换单元， 用于根据所述源直流电压信号生成所述第一直 流电压信号和第二直流电压信号， 通过第一输出接口输出所述第一直流电压 信号到所述负载，通过第二输出接口输出所述第二直流电压信号到所述负载; 参考电压信号生成单元， 用于将所述第一直流电压信号和第二直流电压 信号作为输入信号， 生成参考电压信号， 并输出所述参考电压信号到所述负 载， 所述参考电压信号的电压值小于所述第一直流电压信号的电压值， ή大 于所述第二直流电压信号的电压值。
本发明实施例中， 对于需要至少一个正电压和至少一个负电压的负载， 首先生成两个电压值不同的供电信号， 进而利用这两个供电信号生成电压值 位于二者的电压值之间的参考电压信号提供给负载， 使得负载能够依据该参 考电压信号来确定出一个正电压信号和一个负电压信号。 相对于现有技术中 利用两个 DC DC转换单元来分别生成一个正电压和一个负电压的方式而言， 本发明实施例减少了 DC-DC转换单元的数量， 因此提高了供电效率， 降低了 设备的整体功耗， 同时还降低了产品成本。
本发明实施例的供电装置可以^于各种场合， 其中一种场合下， 所述负 载为有源矩阵有机发光二极管显示面板。
以电视为例， 液晶电视是使用 TF LCD作为显示面板， 使用背光模组作 为 TF LCD的光线来源，也是液晶电视的显示光源。而在 AMOLED电视中， 由于 AMOLED面板是自发光的显示面板， 因此不再需要背光模组。 然而该 显示面板存在电致发光部件， 需要较大的电流才能产生矩阵式受控的光源， 从而形成图案化显示。 因此在 AMOLED 电视中就需要电致发光的电源， 即 EL电源。
由于驱动 AMOLED面板进行显示至少需要 3个电压信号， 因此现有技 术中采用 3个独立的 DC- DC转换单元来提供上述 3个电压信号。
而如果利用本发明实施例的方法， 则两个电压信号 ELVDD和 ELVSS可 以由一个 DC- DC转换单元生成， 因此， 相对于现有技术减少了一个 DC DC 转换单元， 能够降低成本， 减小设备的整体功耗。
依据上述的说明， 本发明实施例的供电装置还包括第二直流-直流转换单 元， 所述参考电压信号生成单元还) ¾于输出所述参考电压信号到所述第二直 流直流转换单元，所述第二直流-直流转换单元具体用于根据所述源直流电压 信号和参考电压信号生成第三直流电压信号， 并输出所述第三直流电压信号 到所述负载， 供负载的逻辑电路使用。
之前已经提到， 虽然一个 DC- DC单元能够生成两个直流电压信号，但如 果参考电压不是位于两个直流电压信号的电压之间， 则这两个直流电压信号 无法作为正、 负电压信号来使用， 因此， 本发明实施例的电源结构中包括参 考电压信号生成单元， 其功能是电压生成位于两个直流电压信号的电压之间 的电信号， 即参考电压信号的电压小于第一直流电压信号的电压， 且大于所 述第二直流电压信号的电压。
本发明实施例上述的参考电压生成单元可以以多种方式实现， 下面就其 中的一种实现方式说明如下， 但本发明具体实施例并不局限于以下的实现方 式。
本发明实施例中， 所述参考电压生成单元具体包括：
分压器， 连接于所述第一输出接口和第二输出接口之间， 分压器具有分 压节点， 所述分压节点的电压值位于所述第一直流电压信号的电压值和第二 直流电压信号之间；
电压跟随器， 与所述分压器的分压节点连接， 用于生成电压值跟随所述 分压节点的电压值的所述参考电压信号。
上述的结构利用分压器的分压功能， 分出一个电压值介入所述第一直流 电压信号的电压值和第二直流电压信号之间的信号， 进而利用电压跟随器来 生成电压值跟随分压节点的电压值的所述参考电压信号， 实现筒单。
而之前提到， 该电压跟随器输出的参考电压信号是要输出到负载和第二 直流-直流转换单元，而电压跟随器和负载以及第二直流-直流转换单元之间的 参考电压信号的传递是靠电流来维持， 因此， 该电压跟随器需要一定的驱动 能力。
为了提供这种驱动能力， 可以为电压跟随器设置独立的电压源， 但为了 简化电路结构， 在本发明的具体实施例中， 直接利用第一直流直流转换单元 输出的两个电压信号进行驱动。
上述实现方式实现的电压跟随器为运算放大器， 如图 3所示， 所述运算 放大器的正相输入端与所述分压节点 P电连接， 所述运算放大器的反相输入 端与所述运算放大器的输出端 Output电连接， 所述运算放大器的正向电源端 与所述第一输出接口电连接， 所述运算放大器的反向电源端与所述第二输出 接口电连接。
基于上述结构， 由于该运算放大器的正负电源端连接的是第一直流-直流 转换单元输出的两个电压信号， 而该两个信号是需要输出到 AMOLED面板 驱动 OLED的， 因此具有相当好的稳定性和驱动能力。 也就是说， 运算放大 器的输出电流是由第一直流-直流转换单元提供， 因此具有一定的驱动能力， 能够向负载以及第二直流 -直流转换单元传递参考电压信号。
如图 3 所示， 本发明实施例的分压器可以包括串联连接的第一电 ffi R1 和第二电阻 R2， 所述分压节点 P设置于所述第一电阻 R1和第二电阻 R2之 间。
由于不同的产品，对应的正负电压信号是不同的，即使同一批次的产品， 由于生产工艺的细微差别， 每个产品需要的正负电压信号也是不同。 而利用 串联的电阻形成的分压器能够方便调节参考电压信号的电压值， 说明如下。
在图 3中的 ELVDD和 ELVSS的电压值确定的情况下， 节点 P的电压为 ( ELVDD的电压值- ELVSS的电压值） Rl/ (RRR2) , 因此， 改变 R1和 R2 中的任意一个即可改变参考电压信号的电压值， 而一旦参考电压信号的电压 值改变，则 ELVDD信号 /ELVSS信号和参考电压信号之间的电压差就会改变， 即正、 负电压改变。
上述的电阻可以是在电源设计前确定， 但也可以将所述第一电阻和第二 电阻中的至少一个设置为可调电阻， 这种情况下， 在所述供电装置增加一个 控制部， 禾拥该控制部来控制可调电阻的阻值， 以控制电压跟随器输出的所 述参考电压信号的电压值。
这种方式使用更加方便， 即使产品在使用过程中发生变化， 导致需要的 正负电压变化时也可以随时调节， 提高了产品的适应能力和使用寿命。
本发明实施例还提供了一种电子设备，包括负载和上述任意的供电装置。 所述负载可以是一有源矩阵有机发光二极管显示面板。
当负载为有源矩阵有机发光二极管显示面板时， 所述供电装置生成的第 一直流电压信号是驱动所述有源矩阵有机发光二极管显示面板的电致发光的 ELVDD信号；所述供电装置生成的第二直流电压信号是驱动所述有源矩阵有 机发光二极管显示面板的电致发光的 ELVSS信号；所述供电装置生成的参考 电压信号是 GND信号。
但在此应该说明的是， GND信号是一种参考信号， 并不一定就是接大地 的信号。
所述供电装置生成的第三直流电压信号是驱动所述有源矩阵有机发光二 极管显示面板的逻辑电路的 VCC信号。 从另一个角度对上述的电子设备说明如下。
本发明实施例的电子设备， 包括负载和用于向所述负载输出具有第一电 压的第一直流电压信号和具有第二电压的第二直流电压信号的供电装置， 所 述供电装置具体包括：
交流-直流转换单元， ffi于提供源直流电压信号；
第一直流-直流转换单元， 用于根据所述源直流电压信号生成所述第一直 流电压信号和第二直流电压信号， 并分别通过第一输出接口和第二输出接口 输出所述第一直流电压信号和第二直流电压信号到所述负载；
参考电压信号生成单元， 用于利用所述第一直流电压信号和第二直流电 压信号作为输入信号， 生成参考电压信号， 并输出所述参考电压信号到所述 负载， 所述参考电压信号的电压值小于所述第一直流电压信号的电压值， 且 大于所述第二直流电压信号的电压值。
在一个示例中， 所述负载为有源矩阵有机发光二极管显示面板。
在一个示例中， 所述供电装置还包括第二直流-直流转换单元， 所述参考 电压信号生成单元还用于输出所述参考电压信号到所述第二直流-直流转换 单元， 所述第二直流-直流转换单元具体用于根据所述源直流电压信号和参考 电压信号生成第三直流电压信号，并输出所述第三直流电压信号到所述负载， 供负载的逻辑电路使) ¾。
在一个示例中， 所述参考电压生成单元具体包括：
分压器， 连接于所述第一输出接口和第二输出接口之间， 所述分压器具 有分压节点， 所述分压节点的电压值位于所述第一直流电压信号的电压值和 第二直流电压信号的电压值之间；
电压跟随器， 与所述分压节点连接， ）¾于生成电压值跟随所述分压节点 的电压值的参考电压信号。
在一个示例中， 所述电压跟随器为运算放大器， 所述运算放大器的正相 输入端与所述分压节点电连接， 所述运算放大器的反相输入端与所述运算放 大器的输出端电连接， 所述运算放大器的正向电源端与所述第一输出接口电 连接， 所述运算放大器的反向电源端与所述第二输出接口电连接。
在一个示例中， 所述分压器包括串联连接的第一电阻和第二电阻， 所述 分压节点设置于所述第一电阻和第二电阻之间。
在一个示例中， 所述第一电阻和第二电阻中的至少一个为可调电 ffi。 在一个示例中， 所述供电装置还包括： 控制部， 用于控制所述可调电阻 的阻值， 以控制电压跟随器输出的所述参考电压信号的电压值。
如图 4所示， 为本发明实施例的电子设备的结构示意图， 其中通过电阻 R l、 R2进行分压，产生介于第一直流-直流转换单元输出的 ELVDD和 ELVSS 之间的电位， 然后连接一个电压跟随器， 该电压跟随器采用运算放大器电路 实现， 由此实现了一个电位产生电路。 由于电位产生电路里的运算放大器的 正负电源分别与电压信号 ELVDD和 ELVSS电连接， 因此该电路输出的电流 由电压信号 ELVDD和 ELVSS提供， 具有一定的驱动能力。 该电路输出端连 接逻辑电路的 GND, 连接输出 VCC的第二直流直流转换单元的 GND, 形成 共同参考电位。
以上说明对本发明而言只是说明性的， 而非限制性的， 本领域普通技术 人员理解， 在不脱离所附权利要求所限定的精神和范围的情况下， 可做出许 多修改、 变化或等效， 但都将落入本发明的保护范围内。

Claims

1 . 一种供电装置， 用于向负载输出具有第一电压的第一直流电压信号和 具有第二电压的第二直流电压信号， 其中， 所述供电装置包括：
交流-直流转换单元， ffi于提供源直流电压信号；
第一直流-直流转换单元， 用于根据所述源直流电压信号生成所述第一直 流电压信号和第二直流电压信号， 并通过第一输出接口输出所述第一直流电 压信号到所述负载， 通过第二输出接口输出所述第二直流电压信号到所述负 载；
参考电压信号生成单元， 用于利用所述第一直流电压信号和第二直流电 压信号作为输入信号， 生成参考电压信号， 并输出所述参考电压信号到所述 负载；
其中，所述参考电压信号的电压值小于所述第一直流电压信号的电压值， 且大于所述第二直流电压信号的电压值。
2. 根据权利要求 1所述的供电装置， 其中， 所述供电装置还包括第二直 流直流转换单元， 所述参考电压信号生成单元还用于输出所述参考电压信号 到所述第二直流-直流转换单元，所述第二直流直流转换单元用于根据所述源 直流电压信号和参考电压信号生成第三直流电压信号， 并输出所述第三直流 电压信号到所述负载， 供所述负载的逻辑电路使用。
3. 根据权利要求 2所述的供电装置，其中，所述参考电压生成单元包括： 分压器， 连接于所述第一输出接口和第二输出接口之间， 所述分压器具 有分压节点， 所述分压节点的电压值位于所述第一直流电压信号的电压值和 所述第二直流电压信号的电压值之间；
电压跟随器， 与所述分压节点连接， 于生成电压值跟随所述分压节点 的电压值的所述参考电压信号。
4. 根据权利要求 3所述的供电装置， 其中， 所述电压跟随器为运算放大 器， 所述运算放大器的正相输入端与所述分压节点电连接， 所述运算放大器 的反相输入端与所述运算放大器的输出端电连接， 所述运算放大器的正向电 源端与所述第一输出接口电连接， 所述运算放大器的反向电源端与所述第二 输出接口电连接。
5. 根据权利要求 3所述的供电装置， 其中， 所述分压器包括串联连接的 第一电阻和第二电阻， 所述分压节点设置于所述第一电阻和第二电阻之间。
6. 根据权利要求 5所述的供电装置， 其中， 所述第一电阻和第二电阻中 的至少一个为可调电阻。
7. 根据权利要求 6所述的供电装置， 其中， 所述供电装置还包括： 控制部， 用于控制所述可调电 ffi的阻值， 以控制电压跟随器输出的所述 参考电压信号的电压值。
8. 一种电子设备， 包括负载和如权利要求 1 -7任一项所述的供电装置。
9. 根据权利要求 8所述的电子设备， 其中， 所述负载为有源矩阵有机发 光二极管显示面板。
10. 根据权利要求 9 所述的电子设备， 其中， 所述供电装置生成的第一 直流电压信号是驱动所述有源矩 有机发光二极管显示面板的电致发光的 ELVDD信号；所述供电装置生成的第二直流电压信号是驱动所述有源矩阵有 机发光二极管显示面板的电致发光的 ELVSS信号；所述供电装置生成的参考 电压信号是 G D信号。
11. 根据权利要求 10所述的电子设备， 其中， 所述供电装置生成的第三 直流电压信号是驱动所述有源矩阵有机发光二极管显示面板的逻辑电路的 VCC信号。
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