WO2014075337A1 - 降低待机功耗的方法 - Google Patents
降低待机功耗的方法 Download PDFInfo
- Publication number
- WO2014075337A1 WO2014075337A1 PCT/CN2012/085225 CN2012085225W WO2014075337A1 WO 2014075337 A1 WO2014075337 A1 WO 2014075337A1 CN 2012085225 W CN2012085225 W CN 2012085225W WO 2014075337 A1 WO2014075337 A1 WO 2014075337A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pin
- led driver
- driver chip
- comparator
- effect transistor
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000005669 field effect Effects 0.000 claims abstract description 47
- YEJRWHAVMIAJKC-UHFFFAOYSA-N 4-Butyrolactone Chemical compound O=C1CCCO1 YEJRWHAVMIAJKC-UHFFFAOYSA-N 0.000 description 8
- 239000004973 liquid crystal related substance Substances 0.000 description 6
- 238000005265 energy consumption Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- 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
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the 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
- 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
Definitions
- the present invention relates to the field of liquid crystal display, and more particularly to a method for reducing power consumption of an LED driver chip during standby. Background technique
- Standby power consumption refers to the energy consumption of home appliances when they are turned off or not using their original functions. Unlike the effective energy consumption generated by home appliances during use, standby power consumption is basically an energy waste. According to the statistics of international authoritative organizations: The standby power consumption of household appliances in the world accounts for 3% ⁇ 13% of the electricity consumption of civilians, accounting for 2% of the total power generation. Among them, the standby energy consumption of TV and other audio and video accounts for 68.6% of the total standby energy consumption. The average standby consumption of existing TV sets in China is as high as 8.07W/set.
- EACEM European Industrial Alliance
- AUDIO PRODUCTS audio products
- standby power consumption must be less than 5W, from 2004 1 It will be less than 3W from the 1st of January and will be less than 1W from January 1, 2007.
- China has also proposed regulations: Since March 1, 2006, TVs with standby power consumption greater than 9W will be banned from sales, and energy conservation is rated at 1W.
- the backlight of the LCD TV mostly uses an LED light source, and the driving chip of the LED lamp generally needs three kinds of signals, namely VCC, BLON and PDIM, as shown in FIG. 1 , where VCC is the input voltage and BLON is enabled.
- Signal, PDIM is the dimming signal.
- the VCC voltage is always present.
- the PDIM voltage will remain low.
- the shortcoming in the prior art is that in the case of standby, the BLON signal may be at a high level. At this time, most of the functions of the LED driver chip have begun to work, which will increase the loss of the LED driver chip, that is, Increase standby power consumption.
- the present invention provides a method of reducing standby power consumption, including the following steps:
- Step 100 Providing an LED driving chip, wherein the LED driving chip has: a brightness control pin, a high voltage switch pin, a first power pin, and a first ground pin;
- Step 200 Providing a comparator, a field effect transistor, and an integrator, wherein the comparator has: a non-inverting input terminal, an inverting input terminal, and a first output end, wherein the integrator has: a first input end, a second input end, and Second output;
- Step 300 electrically connecting the first input end of the integrator to the brightness control pin of the LED driving chip, electrically connecting the second output end to the inverting input end of the comparator, and connecting the non-inverting input end Grounding, electrically connecting the first output end to the field effect transistor, and electrically connecting the field effect transistor to the high voltage switch pin and the ground line of the LED driving chip;
- Step 400 providing a first power source, a second power source, a control source, a resistor, and a reference voltage, electrically connecting the first power pin of the LED driver chip to the first power source, and electrically connecting the first ground pin to the ground wire
- the high voltage switch pin of the LED driver chip is electrically connected to the second power source through a resistor, the brightness control pin and the first input end are electrically connected to the control source, and the second input pin of the integrator is connected to the reference. Voltage;
- Step 500 Turn on the first power source, the second power source, the control source, and the reference voltage, and the integrator and the comparator control the conduction of the field effect transistor according to the signal on the brightness control pin, thereby forcibly pulling down the LED driver chip high voltage The voltage at the switch pin.
- the magnitude of the reference voltage is calculated based on a maximum voltage value, a minimum voltage value, and a minimum duty ratio of a control signal output from the control source.
- the reference voltage is sized such that the output voltage of the integrator is greater than ov.
- the comparator further has: a second power pin and a second ground pin, wherein the second power pin and the second ground pin are used for external working power of the comparator.
- the comparator model is LM324.
- the field effect transistor has: a gate, a source and a drain.
- the gate is electrically connected to the first output
- the source is connected to the ground
- the drain is It is electrically connected to the high voltage switch pin of the LED driver chip.
- the field effect transistor is an N-channel type field effect transistor.
- the LED driver chip also has a plurality of output pins for respectively connecting the LED lamps.
- the number of output pins of the LED driver chip is six.
- the LED driver chip models are TLC5941, MBI5028 and ST2221C.
- the invention also provides a method for reducing standby power consumption, comprising the following steps:
- Step 100 Providing an LED driving chip, wherein the LED driving chip has: a brightness control pin, a high voltage switch pin, a first power pin, and a first ground pin;
- Step 200 Providing a comparator, a field effect transistor, and an integrator, wherein the comparator has: a non-inverting input terminal, an inverting input terminal, and a first output end, wherein the integrator has: a first input end, a second input end, and Second output;
- Step 300 electrically connecting the first input end of the integrator to the brightness control pin of the LED driving chip, electrically connecting the second output end to the inverting input end of the comparator, and connecting the non-inverting input end Grounding, electrically connecting the first output end to the field effect transistor, and electrically connecting the field effect transistor to the high voltage switch pin and the ground line of the LED driving chip;
- Step 400 providing a first power source, a second power source, a control source, a resistor, and a reference voltage
- the first power pin of the LED driver chip is electrically connected to the first power source, the first ground pin is electrically connected to the ground wire, and the high voltage switch pin of the LED driver chip is electrically connected to the second power source through a resistor,
- the brightness control pin and the first input are electrically connected to the control source, and the second input pin of the integrator is connected to the reference voltage;
- Step 500 Turn on the first power source, the second power source, the control source, and the reference voltage, and the integrator and the comparator control the conduction of the field effect transistor according to the signal on the brightness control pin, thereby forcibly pulling down the LED driver chip high voltage The voltage at the switch pin;
- the magnitude of the reference voltage is calculated according to a maximum voltage value, a minimum voltage value, and a minimum duty ratio of a control signal output by the control source;
- the magnitude of the reference voltage can cause the output voltage of the integrator to be greater than 0V;
- the comparator further has: a second power pin and a second ground pin, wherein the second power pin and the second ground pin are used for external working power of the comparator;
- the comparator model is LM324
- the field effect transistor has: a gate, a source, and a drain.
- the gate is electrically connected to the first output end, and the source is connected to the ground.
- the drain is electrically connected to the high voltage switch pin of the LED driving chip;
- the field effect transistor is an N-channel field effect transistor
- the LED driving chip further has a plurality of output pins, and the plurality of output pins are used Connect LED lights separately;
- the number of output pins of the LED driving chip is six;
- the LED driver chip models are TLC5941, MBI5028 and ST2221C.
- Advantageous Effects of the Invention collects the signal of the brightness control pin of the LED driving chip IC through the comparator and the integrator, and the output control level is connected to the high voltage of the LED driving chip during standby of the liquid crystal display.
- the field effect transistor of the switch pin forcibly pulling down the voltage of the high voltage switch pin, to achieve the purpose of turning off most functions of the LED driver chip, can effectively reduce the loss of the LED driver chip during standby, thereby reducing standby power consumption. This method is simple to implement.
- FIG. 1 is a schematic view showing a pin structure of an LED driving chip in the prior art
- FIG. 2 is a flow chart of a method for reducing standby power consumption according to the present invention
- FIG. 3 is a schematic diagram showing the circuit structure of a method for reducing standby power consumption according to the present invention. detailed description
- the present invention provides a method for reducing standby power consumption, including the following steps:
- Step 100 providing an LED driver chip
- the LED driver chip 20 has: a brightness control pin PDIM 3, a high voltage switch pin BLON 4 and a first power pin VCC 9 and a first ground pin 10;
- the LED driving chip 20 also has a plurality of output pins 1, 2, 5, 6, 7, 8 ..., and the plurality of output pins 1, 2, 5, 6, 7, 8... are used for Connect the LED lights separately to drive the LEDs to illuminate.
- the number of output pins of the LED driving chip 20 is six, but not limited to six.
- the LED driving chip 20 is in accordance with the duty of the signal of the brightness control pin PDIM 3
- the size of the ratio controls the brightness of the LED lamp driven by the LED driving chip 20, and the brightness of the LED lamp can be varied to meet various needs.
- the high voltage switch pin BLON 4 is mainly used as an enable signal for controlling whether the LED driving chip 20 operates or is turned off.
- the first power pin VCC 9 is used for an external power supply to provide power conditions for the operation of the LED driver chip 20.
- the LED driver chip 20 may be of the type TLC5941, MBI5028, and ST2221C.
- Step 200 providing a comparator 40, a field effect transistor Q and an integrator 60
- the comparator 40 has: a non-inverting input terminal 15, an inverting input terminal 14 and a first output terminal 11, the integrator 60 having: An input terminal 16, a second input terminal 17 and a second output terminal 18;
- the comparator 40 further has: a second power pin 12 and a second ground pin 13 , wherein the second power pin 12 and the second ground pin 13 are used for externally operating the comparator, the comparator 40
- the operating voltage range is 3-30V.
- the field effect transistor Q is preferably an N-channel type field effect transistor having a gate g, a source s and a drain d, and voltage control applied to the gate g The field effect transistor Q is turned on and off.
- Field-effect transistor Q as an electronic switching circuit has a much higher response speed than ordinary switches, and has high input resistance (10 8 ⁇ 10 9 ⁇ ), low noise, low power consumption, large dynamic range, easy integration, no secondary breakdown. Phenomenon, safe working area and other advantages.
- the integrator 60 can be integrated to obtain an output signal according to the signals input by the first and second input terminals 16 and 17, and output the output signal to the second output terminal 18.
- the comparator 40 can output a voltage according to the magnitude of the two voltages input by the non-inverting input terminal 15 and the inverting input terminal 14.
- the positive and negative voltages of the output voltage are mainly based on the non-inverting input terminal 15 and the inverting input terminal 14
- the magnitude relationship of the two voltages input is determined.
- the voltage on the non-inverting input terminal 15 is greater than the voltage on the inverting input terminal 14, and the voltage output by the comparator 40 is positive, whereas the voltage on the non-inverting input terminal 15 is less than the voltage on the inverting input terminal 14, the comparison The voltage output from device 40 is negative.
- the comparator 40 model is LM324.
- Step 300 The first input end 16 of the integrator 60 is electrically connected to the brightness control pin PDIM 3 of the LED driving chip 20, and the second output end 18 is electrically connected to the inverting input end 14 of the comparator 40. Connecting the non-inverting input terminal 15 to the ground, and electrically connecting the first output terminal 11 to the field effect transistor Q, respectively, and the field effect transistor Q and the high voltage switch pin BLON 4 of the LED driving chip 20, ground. Electrical connection
- step 300 the gate g is electrically connected to the first output end 11, and the source s is Connected to the ground, the drain d is electrically connected to the high voltage switch pin BLON 4 of the LED driving chip 20.
- Step 400 providing a first power source 80, a second power source 30, a control source 70, a resistor R, and a reference voltage 50, electrically connecting the first power pin 9 of the LED driving chip 20 to the first power source 80, and the first grounding
- the pin 10 is electrically connected to the ground
- the high voltage switch pin 4 of the LED driver chip 20 is electrically connected to the second power source 30 through the resistor R
- the brightness control pin 3 and the first input terminal 16 are electrically connected to the control source 70.
- the magnitude of the reference voltage 50 is calculated based on the maximum voltage value, the minimum voltage value, and the minimum duty ratio of the control signal output from the control source 70.
- the control signal output by the control source 70 is the minimum duty ratio
- the reference voltage 50 is sized such that the output voltage of the integrator 60 is greater than 0V, thus ensuring the field effect transistor during the dimming of the brightness control pin PDIM 3 Q will not turn on, and the high voltage switch pin BLON 4 can work normally.
- the integrator 60 can output a negative voltage according to the signal output from the control source 70 and the reference voltage 50.
- Step 500 Turn on the first power source 80, the second power source 30, the control source 70, and the reference voltage
- the integrator 60 and the comparator 40 control the conduction of the field effect transistor Q according to the signal on the brightness control pin PDIM 3, thereby forcibly pulling down the voltage of the high voltage switch pin 4 of the LED driving chip 20.
- the integrator 60 and the comparator 40 control the conduction of the field effect transistor Q according to the signal on the brightness control pin PDIM 3, that is, when the liquid crystal display to which the method is applied is in standby, turn on the field effect transistor Q, forcibly pull
- the low LED driver chip 20 high voltage switches the voltage of the pin 4, thereby turning off most of the functions of the LED driver chip 20, thereby achieving the purpose of reducing standby power consumption.
- the LED driving chip 20 When the brightness control pin PDIM 3 of the LED driving chip 20 is at a low duty ratio, the LED driving chip 20 is in a standby state, and the low duty ratio signal is combined with the reference loaded on the integrator 60.
- the voltage 50 is integrated in the integrator 60, and a negative voltage is output to the inverting input terminal 14 of the comparator 40.
- the forward input terminal 15 of the comparator 40 is connected to the ground, so that the voltage on the inverting input terminal 14 is low.
- the first output terminal 11 of the comparator 40 outputs a high level, driving the field effect transistor Q to turn on.
- the field effect transistor Q is turned on, and the voltage connected to the high level switch pin 4 of the LED driving chip 20 is forcibly pulled low, and the high level switch pin 4 is at a low level control, so that the Most of the functions of the LED driver chip 20 achieve the purpose of reducing standby power consumption.
- the present invention provides a method for reducing standby power consumption, collecting signals of an LED control chip IC brightness control pin through a comparator and an integrator, and outputting when the liquid crystal display is in standby mode.
- the control level turns on the field effect transistor connected to the high voltage switch pin of the LED driver chip, thereby forcibly pulling down the voltage of the high voltage switch pin, thereby achieving the purpose of turning off most functions of the LED driver chip, thereby effectively reducing the standby LED driver.
- the loss of the chip which in turn reduces standby power consumption, is simple to implement.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
- Led Devices (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/806,775 US9066398B2 (en) | 2012-11-15 | 2012-11-25 | Method for reducing standby power consumption |
DE112012007138.7T DE112012007138B4 (de) | 2012-11-15 | 2012-11-25 | Verfahren zur Senkung eines Standby-Stromverbrauchs |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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CN201210460561.0A CN102930834B (zh) | 2012-11-15 | 2012-11-15 | 降低待机功耗的方法 |
CN201210460561.0 | 2012-11-15 |
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WO2014075337A1 true WO2014075337A1 (zh) | 2014-05-22 |
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PCT/CN2012/085225 WO2014075337A1 (zh) | 2012-11-15 | 2012-11-25 | 降低待机功耗的方法 |
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CN (1) | CN102930834B (zh) |
DE (1) | DE112012007138B4 (zh) |
WO (1) | WO2014075337A1 (zh) |
Families Citing this family (5)
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CN103929848B (zh) * | 2014-05-08 | 2019-04-05 | 深圳怡化电脑股份有限公司 | 一种光电传感器的发射端驱动电路 |
CN108257548A (zh) * | 2018-02-13 | 2018-07-06 | 辽宁科技大学 | 一种物联网控制户外led显示屏的方法及户外led显示屏 |
CN110351924B (zh) * | 2019-06-11 | 2021-11-23 | 浙江阳光照明灯具有限公司 | 一种低待机功耗的led驱动电路 |
CN111367398B (zh) * | 2020-02-28 | 2022-05-31 | Oppo(重庆)智能科技有限公司 | 一种熄屏显示控制方法、装置及计算机可读存储介质 |
CN113724646B (zh) * | 2021-09-01 | 2022-02-11 | 北京芯格诺微电子有限公司 | 用于led显示屏的驱动控制方法及装置 |
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KR20080102744A (ko) * | 2007-05-22 | 2008-11-26 | 엘지전자 주식회사 | 영상기기의 전원 관리 방법 및 그 영상기기 |
US8350488B2 (en) | 2009-06-30 | 2013-01-08 | Microsemi Corporation | Integrated backlight control system |
US20120019158A1 (en) | 2010-07-22 | 2012-01-26 | Chiccony Power Technology Co., Ltd. | Polarity-reversible dimming controller having function of switching light source |
TWI417713B (zh) * | 2010-12-23 | 2013-12-01 | Au Optronics Corp | 電子裝置的待機喚醒電路 |
CN102256087B (zh) * | 2011-07-12 | 2016-09-07 | 青岛海信电器股份有限公司 | 一种低功耗待机电路及电视机 |
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2012
- 2012-11-15 CN CN201210460561.0A patent/CN102930834B/zh active Active
- 2012-11-25 DE DE112012007138.7T patent/DE112012007138B4/de active Active
- 2012-11-25 WO PCT/CN2012/085225 patent/WO2014075337A1/zh active Application Filing
Patent Citations (4)
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US5955909A (en) * | 1996-09-30 | 1999-09-21 | Siemens Aktiengesellschaft | Device for monitoring chip temperature |
CN201234390Y (zh) * | 2008-07-18 | 2009-05-06 | 金诗电子技术(上海)有限公司 | 高调光比led驱动芯片 |
CN102082500A (zh) * | 2010-11-19 | 2011-06-01 | 北京中科可来博电子技术有限公司 | Gfl107关机自动断电控制***专用集成芯片 |
CN202487119U (zh) * | 2012-03-14 | 2012-10-10 | 无锡聚润光电电器有限公司 | 公交车上运行信息的显示装置 |
Also Published As
Publication number | Publication date |
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CN102930834A (zh) | 2013-02-13 |
DE112012007138T5 (de) | 2015-08-06 |
DE112012007138B4 (de) | 2018-10-31 |
CN102930834B (zh) | 2014-11-05 |
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