CN104252840B - Driving circuit - Google Patents
Driving circuit Download PDFInfo
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- CN104252840B CN104252840B CN201410460530.4A CN201410460530A CN104252840B CN 104252840 B CN104252840 B CN 104252840B CN 201410460530 A CN201410460530 A CN 201410460530A CN 104252840 B CN104252840 B CN 104252840B
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- control chip
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Abstract
The invention discloses a driving circuit, which is applied to a display device. The driving circuit comprises a master control chip, a DC-DC (Direct Current) chip, an external circuit and an electric control switch, wherein the DC-DC chip is connected with the master control chip, and the DC-DC chip can output a working voltage required by the master control chip to the master control chip when the DC-DC chip is in a working state; the external circuit is used for outputting the working voltage, and the electric control switch is connected between the master control chip and the external circuit in series; when the electric control switch is in an on state, the external circuit can output the working voltage to the master control chip; when the electric control switch is in an off state, the external circuit cannot output the working voltage to the master control chip; the master control chip is used for controlling the electric control switch to be in the on state and controlling the DC-DC chip to be in a non-working state when an LED (Light Emitting Diode) display is positioned in a standby state.
Description
Technical field
The present invention relates to electronic technology field, more particularly, to a kind of drive circuit.
Background technology
With growth in the living standard, people more focus on the environmental protection and energy saving characteristic of electronic product, to purchase electronic product
Efficiency grade, tco (swedish federation of professional employees, career employee association of Sweden)
The aspects such as certification focus more on.But, current led (light emitting diode, light emitting diode) display is generally deposited
In the technical problem of stand-by power consumption higher (typically all between 0.3w～0.5w), cause the waste of the energy.
Content of the invention
The embodiment of the present application is passed through to provide a kind of drive circuit, solves led display in prior art and there is standby work(
Consume higher technical problem.
An embodiment following technical scheme of offer by the application for the application:
A kind of drive circuit, is applied in display device, described drive circuit, comprising:
Main control chip；
Dc-dc chip, is connected with described main control chip, wherein, when described dc-dc chip is in running order, described
Dc-dc chip can export the operating voltage needed for described main control chip to described main control chip；
External circuitses, for exporting described operating voltage；
Electric-controlled switch, is connected between described main control chip and described external circuitses, wherein, is in described electric-controlled switch
During conducting state, described external circuitses can export described operating voltage to described main control chip, is in described electric-controlled switch
During off state, described external circuitses cannot export described operating voltage to described main control chip；
Wherein, described main control chip is used for, when described display device is in holding state, controlling at described electric-controlled switch
In conducting state, and described dc-dc chip is controlled to be in off working state.
Preferably, described dc-dc chip, comprising:
First input end, is connected with power module, and wherein, described power module can export first voltage；
First output end and the second output end；
Wherein, described dc-dc chip is used for: obtain described first voltage from described first input end, and by described first
Voltage conversion is second voltage, exports described second voltage by described first output end；And described first voltage is changed
The first operating voltage needed for described main control chip, and described first operating voltage is exported by described second output end.
Preferably, described drive circuit, also includes:
Voltage conversion circuit, including the second input and the 3rd output end, described second input and described first output
End connects, and described voltage conversion circuit is used for: described second voltage is obtained by described second input, and electric by described second
Pressure is converted to the second operating voltage needed for described main control chip, by the described second work electricity of described 3rd output end output
Pressure.
Preferably, described main control chip, comprising:
3rd input, is connected with described 3rd output end, for obtaining described second work from described voltage conversion circuit
Make voltage；
4th input, is connected with described second output end, for obtaining described first work electricity from described dc-dc chip
Pressure.
Preferably, described external circuitses, comprising:
5th input, is connected with described power module, for obtaining described first voltage from described power module；
3rd output end, is connected with described 4th input by described electric-controlled switch；
Wherein, when described electric-controlled switch turns on, described external circuitses can be obtained described by described 5th input
First voltage, and described first voltage is converted to described first operating voltage, by described 3rd output end to described master control
Chip exports described first operating voltage.
Preferably, described electric-controlled switch, particularly as follows: field-effect transistor.
Preferably, described main control chip, also includes:
First i/o pin, is connected with the Enable Pin of described dc-dc chip；
2nd i/o pin, is connected with the control end of described field-effect transistor；
Wherein, described main control chip, specifically for: when described display device is in holding state, by described first
I/o pin exports shutdown signal to the Enable Pin of described dc-dc chip, to control described dc-dc chip to be off state；With
And Continuity signal is exported to described field-effect transistor by described 2nd i/o pin, to control at described field-effect transistor
In conducting state.
Preferably, described main control chip, also includes:
Internal conversion circuit, is encapsulated in inside described main control chip, and is connected on described 3rd input and the described 4th
Between input；
Wherein, described internal conversion circuit is used for: when described display device is in holding state, from the described 3rd input
End obtains described first operating voltage, and described first operating voltage is converted to described second operating voltage, and to the described 4th
Input exports described second operating voltage.
The one or more technical schemes providing in the embodiment of the present application, at least have the following technical effect that or advantage:
In the embodiment of the present application, disclose a kind of drive circuit, be applied in display device (for example: led display),
Described drive circuit, comprising: main control chip；Dc-dc chip, is connected with described main control chip, wherein, in described dc-dc chip
When in running order, described dc-dc chip can export the operating voltage needed for described main control chip to described main control chip；
External circuitses, for exporting described operating voltage；Electric-controlled switch, is connected between described main control chip and described external circuitses,
Wherein, when described electric-controlled switch is in the conduction state, described external circuitses can export described work to described main control chip
Voltage, when described electric-controlled switch is off state, described external circuitses cannot export described work to described main control chip
Voltage；Wherein, described main control chip is used for, when described display device is in holding state, controlling at described field-effect transistor
In conducting state, and described dc-dc chip is controlled to be in off working state.Due to when led display is in standby mode, closing
Close dc-dc chip so that the no longer power consumption of dc-dc chip, so, efficiently solve led display in prior art and exist
The higher technical problem of stand-by power consumption it is achieved that reducing the power consumption in holding state for the led display, imitate by the technology of energy-conserving and environment-protective
Really.
Brief description
For the technical scheme being illustrated more clearly that in the embodiment of the present invention, will make to required in embodiment description below
Accompanying drawing be briefly described it should be apparent that, drawings in the following description are some embodiments of the present invention, for this
For the those of ordinary skill of field, on the premise of not paying creative work, can also be obtained other according to these accompanying drawings
Accompanying drawing.
Fig. 1 is the schematic diagram of drive circuit in prior art；
Fig. 2 is the schematic diagram of drive circuit in the embodiment of the present application.
Specific embodiment
The embodiment of the present application is passed through to provide a kind of drive circuit, solves led display in prior art and there is standby work(
Consume higher technical problem.
Before drive circuit in introducing the embodiment of the present application, first to drive circuit of the prior art and its presence
Technical problem is introduced as follows:
As shown in figure 1, Fig. 1 is the schematic diagram of drive circuit in prior art, this circuit is applied in led display, main
Including: main control chip and dc-dc chip, wherein, main control chip, as the kernel control chip of led display, is responsible for
The image output of led display and brightness regulation etc..Main control chip has two power pin (that is: pin 17 and pin 16),
Obtain 1.2v voltage in pin 17, when pin 16 obtains 3.3v voltage, main control chip could normal work.
The pin 21 (that is: vin pin) of dc-dc chip is connected with a 14v power module, and dc-dc chip is by power module
The 14v voltage conversion of output is 5v voltage and 3.3v voltage, and exports 5v voltage by pin 22 (that is: vout pin), passes through
Pin 23 (that is: swl pin) exports 3.3v voltage.Wherein, the pin 23 of dc-dc chip and the pin 16 of main control chip are direct-connected,
For exporting 3.3v voltage to pin 16；It is 1.2v voltage that pin 22 passes through a voltage conversion circuit by 5v voltage conversion, and defeated
Go out to the pin 17 of main control chip.
When led display is in holding state, main control chip needs to keep working condition, with timely when needing
Led display is adjusted to working condition, this pin 17 being accomplished by main control chip and pin 16 remain power supply state.?
In prior art, adopt and the pin 20 (that is: enable pin) of dc-dc chip is connected high level all the time so that dc-dc chip begins
Keep working condition eventually, powered with the pin 17 and pin 16 being continuously main control chip.Even if this results at led display
When holding state, dc-dc chip and main control chip are also at normal operating conditions, its standby power 0.3w～0.5w it
Between, there is the higher technical problem of stand-by power consumption.
The technical scheme of the embodiment of the present application is to solve above-mentioned technical problem, and general thought is as follows:
A kind of drive circuit, is applied in display device, described drive circuit, comprising: main control chip；Dc-dc chip, with
Described main control chip connects, and wherein, when described dc-dc chip is in running order, described dc-dc chip can be to described master
Control chip exports the operating voltage needed for described main control chip；External circuitses, for exporting described operating voltage；Electric-controlled switch,
It is connected between described main control chip and described external circuitses, wherein, when described electric-controlled switch is in the conduction state, described outer
Connect circuit and can export described operating voltage to described main control chip, when described electric-controlled switch is off state, described outer
Connect circuit and cannot export described operating voltage to described main control chip；Wherein, described main control chip is used in described display device
When being in holding state, control described field-effect transistor in the conduction state, and control described dc-dc chip to be in inoperative
State.
Purpose, technical scheme and advantage for making one embodiment of the invention are clearer, implement below in conjunction with the present invention
Accompanying drawing in example, is explicitly described to the technical scheme in the embodiment of the present invention it is clear that described embodiment is this
Bright a part of embodiment, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not having
There is the every other embodiment being obtained under the premise of making creative work, broadly fall into the scope of protection of the invention.
Embodiment one
As shown in Fig. 2 present embodiments providing a kind of drive circuit, it is applied to display device (for example: led display)
In, comprising:
Main control chip；
Dc-dc chip, is connected with described main control chip, wherein, when described dc-dc chip is in running order, described
Dc-dc chip can export the operating voltage needed for described main control chip to described main control chip；
External circuitses, for exporting described operating voltage；
Electric-controlled switch, is connected between described main control chip and described external circuitses, wherein, is in described electric-controlled switch
During conducting state, described external circuitses can export described operating voltage to described main control chip, is in described electric-controlled switch
During off state, described external circuitses cannot export described operating voltage to described main control chip；
Wherein, described main control chip is used for, when described display device is in holding state, controlling described electric-controlled switch (example
As: field-effect transistor) in the conduction state, and control described dc-dc chip to be in off working state.
For example, described display device is specifically as follows led display, comprising:
Display floater, is connected with described main control chip, under the control of described main control chip, output image；
Backlight module, is arranged on after described display floater, is connected with described main control chip, in described main control chip
Control under, adjust backlight brightness；
Shell, is arranged on described display floater, outside described backlight module, and described drive circuit, plays protection
Effect.
In specific implementation process, when described led display is in running order, described backlight module is in described master control
Normal luminous under the control of chip, when described led display is in holding state, described backlight module is in described main control chip
Control under do not light.
For example, described electric-controlled switch, is specifically as follows: field-effect transistor or other controllable electronic switch.
Further, described dc-dc chip, comprising:
First input end 21, is connected with power module, and wherein, described power module can export first voltage；
First output end 22 and the second output end 23；
Wherein, described dc-dc chip is used for: obtain described first voltage from described first input end 21, and by described
One voltage conversion is second voltage, exports described second voltage by described first output end 22；And by described first voltage
Be converted to the first operating voltage needed for described main control chip, and described first work electricity is exported by described second output end 23
Pressure.
For example, the first input end 21 (that is: vin pin) of dc-dc chip connects power module, and from this power supply mould
Block obtains first voltage (that is: 14v voltage), by the voltage conversion of dc-dc, by the first output end 22 (that is: vout pin)
Output second voltage (that is: 5v voltage), exports the first work needed for main control chip by the second output end 23 (that is: swl pin)
Make voltage (that is: 3.3v voltage).
Further, described drive circuit, also includes:
Voltage conversion circuit, including the second input 24 and the 3rd output end 25, described second input 24 and described the
One output end 22 connects, and described voltage conversion circuit is used for: obtains described second voltage by described second input 24, by institute
State second voltage and be converted to the second operating voltage needed for described main control chip, and exported by described 3rd output end 25 described
Second operating voltage.
For example, the first output end 22 of the second input 24 of described voltage conversion circuit and dc-dc chip is (i.e.:
Vout pin) connect, described voltage conversion circuit is used for: obtains the of the output of dc-dc chip by described second input 24
Two voltages (that is: 5v voltage), second voltage (that is: 5v voltage) is converted to the second operating voltage needed for main control chip (i.e.:
1.2v voltage), and the second operating voltage (that is: 1.2v voltage) is exported by the 3rd output end 25.
Further, described main control chip, comprising:
3rd input 17, is connected with the 3rd output end 25, for obtaining the second operating voltage from voltage conversion circuit；
4th input 16, is connected with the second output end 23, for obtaining the first operating voltage from dc-dc chip.
For example, described main control chip is obtained from the 3rd output end 25 of voltage conversion circuit by the 3rd input 17
The second operating voltage (that is: 1.2v voltage) needed for main control chip, and by the 4th input 16 from the second of dc-dc chip
Output end 23 (that is: swl pin) obtains the first operating voltage (that is: 3.3v voltage) needed for main control chip.
Further, described external circuitses, comprising:
5th input 11, is connected with described power module, for obtaining described first voltage from described power module；
3rd output end 12, is connected with described 4th input 16 by described field-effect transistor；
Wherein, when described field-effect transistor turns on, described external circuitses can be obtained by described 5th input 11
Take described first voltage, described first voltage be converted to described first operating voltage, and by described 3rd output end 12 to
Described main control chip exports described first operating voltage.
For example, external circuitses obtain the first voltage (that is: 14v) of power module output by the 5th input 11,
And first voltage (that is: 14v) is converted to the first operating voltage (that is: 3.3v voltage) needed for main control chip, then pass through the 3rd
Output end 12 exports the first operating voltage (that is: 3.3v voltage).And, it is in series with an effect between external circuitses and main control chip
Answer transistor, specifically, the drain electrode input 13 of field-effect transistor is connected with the 3rd output end 12 of external circuitses, field-effect
The source electrode output end 14 of transistor is connected with the 4th input 16 of main control chip.
Further, described main control chip, also includes:
First i/o pin 18, is connected with the Enable Pin 20 of described dc-dc chip；
2nd i/o pin 19, is connected with the control end 15 (that is: grid control end) of described field-effect transistor；
Wherein, described main control chip, specifically for: when described led display is in holding state, by described first
I/o pin 18 exports shutdown signal (for example: low level signal) to the Enable Pin 20 of described dc-dc chip, to control described dc-
Dc chip is in off working state (that is: closed mode)；And pass through the control to described field-effect transistor for the 2nd i/o pin 19
End 15 (that is: grid control end) processed exports a Continuity signal, to control described field-effect transistor in the conduction state, so that
The 4th input 16 obtaining external circuitses for main control chip provides the first operating voltage (that is: 3.3v voltage).
Further, described main control chip, also includes:
Internal conversion circuit, is encapsulated in inside described main control chip, and is connected on described 3rd input 17 and described the
Between four inputs 16；
Wherein, described internal conversion circuit is used for: when described led display is in holding state, defeated from the described 3rd
Enter end 16 and obtain described first operating voltage (that is: 3.3v voltage), described first operating voltage (that is: 3.3v voltage) is converted to
Described second operating voltage (that is: 1.2v voltage), and export described second operating voltage (i.e.: to described 4th input 17
1.2v voltage) so that master control chip obtains the operating voltage of 3.3v and 1.2v simultaneously, thus being in normal working condition.
When described led display needs to recover to working condition from holding state, main control chip controls led display
Backlight module lights, and sends enable signal (that is: high level letter by an i/o pin 18 to the Enable Pin 20 of dc-dc
Number), the state so that dc-dc chip is resumed work, thus provide the operating voltage of 1.2v and 3.3v to main control chip；And master control
Chip passes through an i/o pin 19 and sends cut-off signals to the Enable Pin 15 (that is: grid control end) of field-effect transistor, with
Turn off field-effect transistor, so that external circuitses stop to main control chip output services voltage.Because dc-dc chip has
Have the advantages that electric energy conversion efficiency is high, when led display resumes work state, be master control chip power supply using dc-dc chip,
The utilization ratio of the energy can be improved.
Technical scheme in above-mentioned the embodiment of the present application, at least has the following technical effect that or advantage:
In the embodiment of the present application, due to when led display is in standby mode, closing dc-dc chip so that
The no longer power consumption of dc-dc chip, and flow through the electric current of main control chip and only have tens microamperes, main control chip overall power is close to 0w, institute
To efficiently solve led display in prior art and to there is the higher technical problem of stand-by power consumption it is achieved that reduction led shows
Show the power consumption in holding state for the device, the technique effect of energy-conserving and environment-protective.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and modification to these embodiments.So, claims are intended to be construed to including excellent
Select embodiment and fall into being had altered and changing of the scope of the invention.
Obviously, those skilled in the art can carry out the various changes and modification essence without deviating from the present invention to the present invention
God and scope.So, if these modifications of the present invention and modification belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprise these changes and modification.
Claims (8)
1. a kind of drive circuit, is applied in display device it is characterised in that described drive circuit, comprising:
Main control chip；
Dc-dc chip, is connected with described main control chip, wherein, when described dc-dc chip is in running order, described dc-dc
Chip can export the operating voltage needed for described main control chip to described main control chip；
External circuitses, for exporting described operating voltage；
Electric-controlled switch, is connected between described main control chip and described external circuitses, wherein, is in described electric-controlled switch
During state, described external circuitses can export described operating voltage to described main control chip, is off in described electric-controlled switch
During state, described external circuitses cannot export described operating voltage to described main control chip；Wherein, described main control chip is used for
When described display device is in holding state, controls described electric-controlled switch in the conduction state, and control at described dc-dc chip
In off working state.
2. drive circuit as claimed in claim 1 is it is characterised in that described dc-dc chip, comprising:
First input end, is connected with power module, and wherein, described power module can export first voltage；
First output end and the second output end；
Wherein, described dc-dc chip is used for: obtain described first voltage from described first input end, and by described first voltage
Be converted to second voltage, described second voltage is exported by described first output end；And described first voltage is converted to institute
State the first operating voltage needed for main control chip, and described first operating voltage is exported by described second output end.
3. drive circuit as claimed in claim 2, it is characterised in that described drive circuit, also includes:
Voltage conversion circuit, including the second input and the 3rd output end, described second input is with described first output end even
Connect, described voltage conversion circuit is used for: described second voltage is obtained by described second input, and described second voltage is turned
It is changed to the second operating voltage needed for described main control chip, described second operating voltage is exported by described 3rd output end.
4. drive circuit as claimed in claim 3 is it is characterised in that described main control chip, comprising:
3rd input, is connected with described 3rd output end, for obtaining described second work electricity from described voltage conversion circuit
Pressure；
4th input, is connected with described second output end, for obtaining described first operating voltage from described dc-dc chip.
5. drive circuit as claimed in claim 4 is it is characterised in that described external circuitses, comprising:
5th input, is connected with described power module, for obtaining described first voltage from described power module；
3rd output end, is connected with described 4th input by described electric-controlled switch；
Wherein, when described electric-controlled switch turns on, described external circuitses can obtain described first by described 5th input
Voltage, and described first voltage is converted to described first operating voltage, by described 3rd output end to described main control chip
Export described first operating voltage.
6. described drive circuit as arbitrary in Claims 1 to 5 is it is characterised in that described electric-controlled switch, particularly as follows:
Field-effect transistor.
7. drive circuit as claimed in claim 6, it is characterised in that described main control chip, also includes:
First i/o pin, is connected with the Enable Pin of described dc-dc chip；
2nd i/o pin, is connected with the control end of described field-effect transistor；
Wherein, described main control chip, specifically for: when described display device is in holding state, by a described i/o pipe
Pin exports shutdown signal to the Enable Pin of described dc-dc chip, to control described dc-dc chip to be in off working state；And
Continuity signal is exported to described field-effect transistor by described 2nd i/o pin, to control described field-effect transistor to be in
Conducting state.
8. the drive circuit as described in claim 4 or 5, it is characterised in that described main control chip, also includes:
Internal conversion circuit, is encapsulated in inside described main control chip, and is connected on described 3rd input and described 4th input
Between end；
Wherein, described internal conversion circuit is used for: when described display device is in holding state, obtains from described 3rd input
Take described first operating voltage, described first operating voltage is converted to described second operating voltage, and to the described 4th input
End exports described second operating voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410460530.4A CN104252840B (en) | 2014-09-11 | 2014-09-11 | Driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410460530.4A CN104252840B (en) | 2014-09-11 | 2014-09-11 | Driving circuit |
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| Publication Number | Publication Date |
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| CN104252840A CN104252840A (en) | 2014-12-31 |
| CN104252840B true CN104252840B (en) | 2017-01-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410460530.4A Expired - Fee Related CN104252840B (en) | 2014-09-11 | 2014-09-11 | Driving circuit |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130317A (en) * | 2016-07-14 | 2016-11-16 | 深圳创维－Rgb电子有限公司 | One-board power supply and television set |
| CN109683844A (en) * | 2019-01-11 | 2019-04-26 | 京东方科技集团股份有限公司 | Line-screen control circuit, bar shaped screen display system and line-screen control method |
| CN110769566A (en) * | 2019-10-23 | 2020-02-07 | 东莞市喜见天能源技术有限公司 | LED driver circuit and working method thereof |
| CN114120927B (en) * | 2021-12-06 | 2023-03-28 | Tcl华星光电技术有限公司 | Backlight module and display device |
| CN117565845B (en) * | 2024-01-16 | 2024-04-05 | 千顾汽车科技(江苏)有限公司 | EPB drive circuit based on QM pre-drive chip |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR0141217B1 (en) * | 1993-11-30 | 1998-06-15 | 김광호 | Power reduction circuits |
| KR100512747B1 (en) * | 2003-10-01 | 2005-09-07 | 삼성전자주식회사 | Power supply system of display apparatus and control method thereof |
| JP4885706B2 (en) * | 2006-12-28 | 2012-02-29 | 富士通株式会社 | Power supply monitoring and control device for display device |
| KR20090074367A (en) * | 2008-01-02 | 2009-07-07 | 엘지전자 주식회사 | Apparatus for power supply of flat display |
| CN201556159U (en) * | 2009-06-30 | 2010-08-18 | 青岛海信电器股份有限公司 | Low-power consumption standby circuit and liquid crystal display device with same |
| CN201491157U (en) * | 2009-08-24 | 2010-05-26 | 葛锦明 | Energy-saving television with low power consumption |
| CN101742186B (en) * | 2009-11-27 | 2012-09-26 | 深圳创维－Rgb电子有限公司 | Liquid crystal display television (LCD TV) power system |
| CN201957155U (en) * | 2010-12-31 | 2011-08-31 | 康佳集团股份有限公司 | Energy saving television set |
| CN202197147U (en) * | 2011-09-22 | 2012-04-18 | 珠海格力电器股份有限公司 | Electrical appliance and control circuit thereof |
| CN102404625B (en) * | 2011-11-09 | 2014-08-20 | 北京赛科世纪数码科技有限公司 | Set-top box and standby control method thereof |
| CN103857101B (en) * | 2012-11-29 | 2016-08-03 | 深圳市海洋王照明工程有限公司 | A kind of drive circuit and light fixture |
| CN203339951U (en) * | 2013-07-30 | 2013-12-11 | 深圳市广泰博科技有限公司 | Non-isolated DC/DC low stand-by power consumption type circuit |
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2014
- 2014-09-11 CN CN201410460530.4A patent/CN104252840B/en not_active Expired - Fee Related
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| CN104252840A (en) | 2014-12-31 |
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