CN108539973B - Tft-lcd显示器及其驱动电路、开关电源 - Google Patents

Tft-lcd显示器及其驱动电路、开关电源 Download PDF

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CN108539973B
CN108539973B CN201810481375.2A CN201810481375A CN108539973B CN 108539973 B CN108539973 B CN 108539973B CN 201810481375 A CN201810481375 A CN 201810481375A CN 108539973 B CN108539973 B CN 108539973B
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黎云涛
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
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    • H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
    • H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
    • H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
    • G02F1/1362—Active matrix addressed cells
    • G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
    • 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
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
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    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery
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    • 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
    • G09G2330/021—Power management, e.g. power saving
    • 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
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Abstract

本发明提供一种TFT‑LCD显示器及其驱动电路、开关电源，该开关电源包括脉宽调制控制器、电信号发生器和场效应管，其中，所述电信号发生器的输出引脚输出在多个电压范围之间周期性变化的电压信号，其中，所述脉宽调制控制器的频率引脚与所述电信号发生器的输出引脚连接以接收所述电压信号，所述脉宽调制控制器根据所述频率引脚接收的电压信号的电压范围通过输出引脚输出预定频率的开关信号，其中，所述场效应管的栅极引脚与所述脉宽调制控制器的输出引脚连接，所述场效应管的源极引脚接地。本发明避免了开关电源长时间使用同一频率的开关信号，使得电路的EMI辐射降低，减少了传导影响量。

Description

TFT-LCD显示器及其驱动电路、开关电源
技术领域
本发明涉及电源电路领域，更具体地讲，涉及一种TFT-LCD显示器及其驱动电路、开关电源。
背景技术
薄膜晶体管液晶显示器(TFT-LCD)的直流-直流转换器(DC/DC)电路大部分使用开关电源。开关电源将较高的直流电压(如12V)转换成较低的直流电压(如5V、3.3V、2.5V等)，以供给显示器中的微处理器、图像数字处理器等电路使用。
在电路设计完成之后，开关电源的开关频率就保持一个固定频率，整个DC/DC电路中的开关将使用同一个开关频率，这样的设计容易使单一频点的电磁干扰(EMI)辐射较大，并且由于开关频率较低，当整机的配电板(Power board)的隔离做得不太好的时候，还会引起传导问题。
发明内容
本发明的目的在于提供一种TFT-LCD显示器及其驱动电路、开关电源，以解决现有的TFT-LCD电路中的EMI辐射较大以及存在的传导问题。
本发明的一方面提供一种开关电源，该电压开关包括脉宽调制控制器、电信号发生器和场效应管，其中，所述电信号发生器的输出引脚输出在多个电压范围之间周期性变化的电压信号，其中，所述脉宽调制控制器的频率引脚与所述电信号发生器的输出引脚连接以接收所述电压信号，所述脉宽调制控制器根据所述频率引脚接收的电压信号的电压范围通过输出引脚输出预定频率的开关信号，其中，所述场效应管的栅极引脚与所述脉宽调制控制器的输出引脚连接，所述场效应管的源极引脚接地。
可选地，所述电压信号为方波信号。
可选地，所述电压信号为时钟信号。
可选地，所述开关电源还包括电感器，所述电感器串联在所述开关电源的输入电源与所述场效应管的漏极引脚之间。
可选地，所述开关电源还包括晶体三极管，所述晶体三极管的集电极引脚、发射极引脚均与所述场效应管的漏极引脚连接，所述晶体三极管的基极引脚与开关电源的输出引脚连接。
可选地，晶体三极管为PNP型晶体三极管。
可选地，所述多个电压范围包括第一电压范围和第二电压范围。
可选地，所述第一电压范围为0至0.7V，第二电压范围为2.7V至3.3V；和/或，与所述第一电压范围对应的预定频率为500KHZ，与所述第二电压范围对应的预定频率为750KHZ。
本发明的另一方面还提供一种TFT-LCD显示器的驱动电路，驱动电路包括如权利要求上所述的开关电源。
本发明的另一方面还提供一种TFT-LCD显示器，TFT-LCD显示器包括如上所述的驱动电路。
根据本发明的实施例的开关电源，在脉宽调制控制器的频率引脚处接入电压周期性变化的电信号，使得脉宽调制控制器输出的开关信号的频率周期性的变化，避免了开关电源长时间使用同一频率的开关信号，使得电路的EMI辐射降低，减少了传导影响量。
将在接下来的描述中部分阐述本发明另外的方面和/或优点，还有一部分通过描述将是清楚的，或者可以经过本发明的实施而得知。
附图说明
通过下面结合示例性地示出实施例的附图进行的描述，本发明示例性实施例的上述和其他目的和特点将会变得更加清楚，其中：
图1是示出根据本发明的实施例的开关电源的电路示例图。
具体实施方式
图1是示出根据本发明的实施例的开关电源的电路示例图。
如图1所示，根据本发明的实施例的开关电源包括脉宽调制(PWM)控制器101、电信号发生器102和场效应管Q3。
电信号发生器102可以是各种可以产生在多个电压范围之间周期性变化的电压信号的器件。该电信号发生器102可以是专门为开关电源设置的电信号发生器，也可以是开关电源与使用开关电源的电路(例如TFT-LCD显示器电路)共用的电信号发生器。
电信号发生器102通过其输出引脚输出在多个电压范围之间周期性变化的电压信号。在一个实施例中，该多个电压范围为两个电压范围，分别为第一电压范围和第二电压范围。第一电压范围中的电压值小于第二电压范围中的电压值。作为示例，第一电压范围为0至0.7V，第二电压范围为2.7V至3.3V。
该电压信号可以是方波信号。例如该电压信号可以是方波信号中的时钟信号或其他周期性变化的信号。
脉宽调制控制器101包括频率引脚(FSEL)和输出引脚。
脉宽调制控制器101的频率引脚与电信号发生器102的输出引脚连接以接收电压信号。该电压信号是电信号发生器102发出的在多个电压范围之间周期性变化的电压信号。
脉宽调制控制器101根据频率引脚接收的电压信号的电压范围通过输出引脚输出预定频率的开关信号。具体说来，脉宽调制控制器101输出与该电压信号的电压范围对应的预定频率的开关信号。由于该电压信号在多个电压范围之间周期性变化，因此，脉宽调制控制器101输出的开关信号的频率也会周期性地发生变化。
在多个电压范围包括第一电压范围和第二电压范围的情况下，当脉宽调制控制器101通过频率引脚接收的电压信号在第一电压范围时，脉宽调制控制器101通过输出引脚输出与第一电压范围对应的预定频率的开关信号；当脉宽调制控制器101通过频率引脚接收的电压信号在第二电压范围时，脉宽调制控制器101通过输出引脚输出与第二电压范围对应的预定频率的开关信号。
作为示例，所述第一电压范围对应的预定频率为500KHZ，与所述第二电压范围对应的预定频率为750KHZ。也就是说，在多个电压范围包括第一电压范围和第二电压范围的情况下，脉宽调制控制器101输出的开关信号的频率在500KHZ和750KHZ之间周期性地跳变。
场效应管Q3的栅极引脚G与脉宽调制控制器101的输出引脚连接，源极引脚S接地。由于场效应管Q3的栅极引脚G与脉宽调制控制器101的输出引脚连接，即场效应管Q3的栅极引脚G接收预定频率的开关信号，该开关信号可控制源极引脚S和漏极D引脚之间的导通与截止。
在另一个实施例中，开关电源还包括电感器L11。该电感器L11串联在开关电源的输入电源Vin与场效应管Q3的漏极引脚D之间。
此外，开关电源还可包括晶体三极管D4。晶体三极管D4的集电极引脚C、发射极引脚E均与场效应管Q3的漏极引脚D连接，晶体三极管D4的基极引脚B与开关电源的输出引脚Vout连接。该晶体三极管可以是各种类型的晶体三级管。例如该晶体三极管为PNP型晶体三极管。
本发明的实施例还提供一种FT-LCD显示器的驱动电路。该驱动电路包括如上所述的开关电源。
本发明的实施例还提供一种FT-LCD显示器。该显示器包括如上所述的驱动电路。
根据本发明的实施例的开关电源，在脉宽调制控制器的频率引脚处接入电压周期性变化的电信号，使得脉宽调制控制器输出的开关信号的频率周期性的变化，避免了开关电源长时间使用同一频率的开关信号，使得电路的EMI辐射降低，减少了传导影响量。
尽管已经参照其示例性实施例具体显示和描述了本发明，但是本领域的技术人员应该理解，在不脱离权利要求所限定的本发明的精神和范围的情况下，可以对其进行形式和细节上的各种改变。

Claims (10)

1.一种开关电源，其特征在于，包括脉宽调制控制器、电信号发生器和场效应管，
其中，所述电信号发生器的输出引脚输出在多个电压范围之间周期性变化的电压信号，
其中，所述脉宽调制控制器的频率引脚与所述电信号发生器的输出引脚连接以接收所述电压信号，所述脉宽调制控制器根据所述频率引脚接收的电压信号的不同电压范围通过输出引脚输出不同预定频率的开关信号，
其中，所述场效应管的栅极引脚与所述脉宽调制控制器的输出引脚连接，所述场效应管的源极引脚接地。
2.根据权利要求1所述的开关电源，其特征在于，所述电压信号为方波信号。
3.根据权利要求2所述的开关电源，其特征在于，所述电压信号为时钟信号。
4.根据权利要求1所述的开关电源，其特征在于，所述开关电源还包括电感器，所述电感器串联在所述开关电源的输入电源与所述场效应管的漏极引脚之间。
5.根据权利要求1所述的开关电源，其特征在于，所述开关电源还包括晶体三极管，所述晶体三极管的集电极引脚、发射极引脚均与所述场效应管的漏极引脚连接，所述晶体三极管的基极引脚与开关电源的输出引脚连接。
6.根据权利要求5所述的开关电源，其特征在于，晶体三极管为PNP型晶体三极管。
7.根据权利要求1所述的开关电源，其特征在于，所述多个电压范围包括第一电压范围和第二电压范围。
8.根据权利要求7所述的开关电源，其特征在于，所述第一电压范围为0至0.7V，第二电压范围为2.7V至3.3V；和/或，与所述第一电压范围对应的预定频率为500KHZ，与所述第二电压范围对应的预定频率为750KHZ。
9.一种TFT-LCD显示器的驱动电路，其特征在于，包括如权利要求1至8中的任意一项所述的开关电源。
10.一种TFT-LCD显示器，其特征在于，包括如权利要求9所述的驱动电路。
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