CN105957475A - 一种电力仪表显示屏控制电路 - Google Patents

一种电力仪表显示屏控制电路 Download PDF

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Publication number
CN105957475A
CN105957475A CN201511004495.6A CN201511004495A CN105957475A CN 105957475 A CN105957475 A CN 105957475A CN 201511004495 A CN201511004495 A CN 201511004495A CN 105957475 A CN105957475 A CN 105957475A
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CN
China
Prior art keywords
mcu
resistor
pull
lcd
control circuit
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Pending
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CN201511004495.6A
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English (en)
Inventor
杨立军
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Tianjin Pin Tong Power Tech Corp Inc
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Tianjin Pin Tong Power Tech Corp Inc
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Priority to CN201511004495.6A priority Critical patent/CN105957475A/zh
Publication of CN105957475A publication Critical patent/CN105957475A/zh
Pending legal-status Critical Current

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • 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
    • G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
    • G09G3/16—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions by control of light from an independent source
    • G09G3/18—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions by control of light from an independent source using liquid crystals

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

本发明提供一种电力仪表显示屏控制电路，包括MCU、LCD、上拉电阻R2、三极管和电阻，所述MCU型号为PIC18F45K80，所述上拉电阻R2为可调电阻，三极管的基极通过电阻后分两路，一路与MCU相连，另一路通过R2后接VCC，三极管的发射极接地，集电极通过LCD后接VCC。通过增设一个上拉电阻R2，当MCU的MCU-COL管脚置高时，三极管导通，LCD亮，当关闭背光灯时，将MCU的MCU-COL管脚置于输入状态，此时MCU-COL管脚为高阻态，从三极管中会流过一个小电流，使LCD处于微亮状态，并可通过调节上拉电阻R2大小来调节背光灯的亮暗程度；具有电路设计简单、显示屏使用时间长等优点。

Description

一种电力仪表显示屏控制电路
技术领域
本发明属于控制电路领域，尤其是涉及一种电力仪表显示屏控制电路。
背景技术
电力仪表能够实现电量测量、电能计量、数据显示、采集及传输等功能，在电力行业被广泛应用。现有的电力仪表通常采用段码液晶LED显示，当用段码液晶时，背光灯熄灭后，显示屏就看不见任何显示数据，在现场应用中会使工作人员认为设备未运行，从而使工作人员造成误解，容易出现安全隐患。
发明内容
有鉴于此，本发明旨在提出一种结构简单、使用安全的电力仪表显示屏控制电路，使背光灯并不完全熄灭，处于微亮的状态。
为达到上述目的，本发明的技术方案是这样实现的：
一种电力仪表显示屏控制电路，包括MCU、电阻R1、上拉电阻R2、三极管Q1和显示屏背光灯LCD，所述三极管Q1的基极通过电阻R1后分两路，一路与所述MCU的MCU-COL管脚相连，另一路通过上拉电阻R2后接电源VCC，所述三极管Q1的发射极接地，所述三极管Q1的集电极通过显示屏背光灯LCD后接电源VCC。
进一步的，所述MCU型号为PIC18F45K80。
进一步的，所述上拉电阻R2为可调电阻。
相对于现有技术，本发明所述的电力仪表显示屏控制电路具有以下优势：通过增设一个上拉电阻R2，当MCU的MCU-COL管脚置高时，三极管Q1导通，背光灯LCD亮，当关闭背光灯时，将MCU的MCU-COL管脚置于输入状态，此时MCU-COL管脚为高阻态，从三极管Q1中会流过一个小电流，使背光灯LCD处于微亮状态，可以看清显示内容，并可通过调节上拉电阻R2的大小来调节背光灯的亮暗程度；具有结构简单、使用方便、延长显示屏寿命等优点。
附图说明
构成本发明的一部分的附图用来提供对本发明的进一步理解，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：
图1是本发明的电路图；
图2是本发明在MCU的MCU-COL管脚置于输入状态时的等效电路图。
具体实施方式
需要说明的是，在不冲突的情况下，本发明中的实施例及实施例中的特征可以相互组合。
下面将参考附图并结合实施例来详细说明本发明。
如图1所示，一种电力仪表显示屏控制电路，包括MCU、电阻R1、上拉电阻R2、三极管Q1和显示屏背光灯LCD，所述三极管Q1的基极通过电阻R1后分两路，一路与所述MCU的MCU-COL管脚相连，另一路通过上拉电阻R2后接电源VCC，所述三极管Q1的发射极接地，所述三极管Q1的集电极通过显示屏背光灯LCD后接电源VCC，所述MCU型号为PIC18F45K80，所述上拉电阻R2为可调电阻。
本实例的工作过程：通过MCU的MCU-COL管脚来控制背光灯的亮灭，当MCU的MCU-COL管脚置高时，三极管Q1导通，背光灯LCD亮，当关闭背光灯时，将MCU的MCU-COL管脚置于输入状态，此时MCU-COL管脚为高阻态，如图2所示，从三极管Q1中会流过一个小电流，使背光灯LCD处于微亮状态，可以看清显示内容，并可通过调节上拉电阻R2的大小来调节背光灯LCD的亮暗程度。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (3)

1.一种电力仪表显示屏控制电路，其特征在于：包括MCU、电阻R1、上拉电阻R2、三极管Q1和显示屏背光灯LCD，所述三极管Q1的基极通过电阻R1后分两路，一路与所述MCU的MCU-COL管脚相连，另一路通过上拉电阻R2后接电源VCC，所述三极管Q1的发射极接地，所述三极管Q1的集电极通过显示屏背光灯LCD后接电源VCC。
2.根据权利要求1所述的一种电力仪表显示屏控制电路，其特征在于：所述上拉电阻R2为可调电阻。
3.根据权利要求1或2所述的一种电力仪表显示屏控制电路，其特征在于：所述MCU型号为PIC18F45K80。
CN201511004495.6A 2015-12-27 2015-12-27 一种电力仪表显示屏控制电路 Pending CN105957475A (zh)

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Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07181928A (ja) * 1993-12-22 1995-07-21 Nikon Corp ドットｌｃｄ表示システム
KR20050039812A (ko) * 2005-04-07 2005-04-29 서명수 전력절감을 위한 엘시디 광고판의 구동장치
JP2008015463A (ja) * 2006-06-30 2008-01-24 Lg Philips Lcd Co Ltd Ｌｃｄバックライト用デジタルインバータのｌｃｃ
CN201429968Y (zh) * 2009-07-03 2010-03-24 深圳华为通信技术有限公司 用户设备及其背光驱动电路
CN201655263U (zh) * 2010-01-21 2010-11-24 北京凯瑞通电子技术有限公司 电梯外呼板lcd背光驱动电路
CN202487120U (zh) * 2012-03-15 2012-10-10 深圳麦格米特电气股份有限公司 一种led背光驱动电路
CN102855849A (zh) * 2012-09-20 2013-01-02 青岛海信电器股份有限公司 一种液晶背光驱动电流控制装置
CN203120114U (zh) * 2012-10-23 2013-08-07 深圳创维数字技术股份有限公司 一种耳机接口的保护电路及终端设备
CN203313488U (zh) * 2013-06-03 2013-11-27 青岛海信电器股份有限公司 背光驱动电路及灯条调光单元
CN103680414A (zh) * 2012-09-13 2014-03-26 上海江森自控汽车电子有限公司 一种lcd显示屏背光恒流驱动电路
CN205302901U (zh) * 2015-12-27 2016-06-08 天津市品通电力科技有限公司 一种微亮型背光控制电路

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07181928A (ja) * 1993-12-22 1995-07-21 Nikon Corp ドットｌｃｄ表示システム
KR20050039812A (ko) * 2005-04-07 2005-04-29 서명수 전력절감을 위한 엘시디 광고판의 구동장치
JP2008015463A (ja) * 2006-06-30 2008-01-24 Lg Philips Lcd Co Ltd Ｌｃｄバックライト用デジタルインバータのｌｃｃ
CN201429968Y (zh) * 2009-07-03 2010-03-24 深圳华为通信技术有限公司 用户设备及其背光驱动电路
CN201655263U (zh) * 2010-01-21 2010-11-24 北京凯瑞通电子技术有限公司 电梯外呼板lcd背光驱动电路
CN202487120U (zh) * 2012-03-15 2012-10-10 深圳麦格米特电气股份有限公司 一种led背光驱动电路
CN103680414A (zh) * 2012-09-13 2014-03-26 上海江森自控汽车电子有限公司 一种lcd显示屏背光恒流驱动电路
CN102855849A (zh) * 2012-09-20 2013-01-02 青岛海信电器股份有限公司 一种液晶背光驱动电流控制装置
CN203120114U (zh) * 2012-10-23 2013-08-07 深圳创维数字技术股份有限公司 一种耳机接口的保护电路及终端设备
CN203313488U (zh) * 2013-06-03 2013-11-27 青岛海信电器股份有限公司 背光驱动电路及灯条调光单元
CN205302901U (zh) * 2015-12-27 2016-06-08 天津市品通电力科技有限公司 一种微亮型背光控制电路

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Application publication date: 20160921