CN101533634A - Display power source control device - Google Patents
Display power source control device Download PDFInfo
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- CN101533634A CN101533634A CN200810300513A CN200810300513A CN101533634A CN 101533634 A CN101533634 A CN 101533634A CN 200810300513 A CN200810300513 A CN 200810300513A CN 200810300513 A CN200810300513 A CN 200810300513A CN 101533634 A CN101533634 A CN 101533634A
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- display
- power supply
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Abstract
The invention relates to a display power source control device, which comprises a signal interface, an AC power source interface, a sampling circuit, a control circuit and a display power source rectifying circuit, wherein an input end of the display power source rectifying circuit is connected with the AC power source interface; the AC power source interface is used for providing power source for a display; an input end of the sampling circuit is connected with a lead pin of the signal interface so as to receive an AC voltage and output a DC voltage to an input end of the control circuit after rectifying and sampling the AC voltage; and after receiving the DC voltage, the control circuit compares the DC voltage with a reference voltage, and outputs a control signal to a control end of the display power source rectifying circuit according to a comparison result to control the on-off of the display power source rectifying circuit so as to control the on-off of the power source of the display. The display power source control device can automatically control the on-off of the power source of the display, thereby effectively saving energy resources, and prolonging the service life.
Description
Technical field
The present invention relates to a kind of power control, particularly a kind of controller for power supply of display.
Background technology
Electric energy is the most important energy of industrial society, and along with the continuous progressive development of society, people are also more and more stronger to the dependence of electric energy, and energy-conserving and environment-protective are important indicators of consumer electronic product.Display is the important ingredient of computer, has huge quantity in the world.The on-off mode of display mainly still adopts hand switch at present, even the time spent turns on the power switch powered-down switch when not using.
Also there is increasing display to use electronic switch now.This moment, display will exist a standby power supply to come for electronic switch provides power supply as host computer at any time, and prepare to open primary power at any time and make display work, thereby can continuous consumed power.Because people have been accustomed to the software shutdown of host computer, thereby after the host computer shutdown, also forget that through regular meeting the power supply of closing display causes a large amount of electric energy of consumption, reduces the serviceable life of display etc.
Summary of the invention
In view of above content, be necessary to provide a kind of controller for power supply of display with the control display power supply can be with the switch of computer host power supply switch.
A kind of controller for power supply of display, comprise a signaling interface and an AC power interface, one sample circuit, one control circuit and a display power supply rectification circuit, the input end of described display power supply rectification circuit connects described AC power interface, described AC power interface is used to provide the power supply of display, the input end of described sample circuit links to each other with a pin in the described signaling interface to receive an alternating voltage and to the input end of described ac voltage rectifier sampling back output one direct current voltage to described control circuit, after described control circuit receives described DC voltage, with described DC voltage and a reference voltage compares and the control end that controls signal to described display power supply rectification circuit according to comparative result output one with the break-make of controlling described display power supply rectification circuit and then the break-make of control display power supply.
Compared to prior art, described controller for power supply of display outputs to the break-make that described control circuit is controlled described display power supply circuit after the voltage signal on the host computer is taken a sample by sample circuit, make display along with the switch of main frame automatic switch, thereby can make display energy savings to the full extent, also improve serviceable life to a certain extent.
Description of drawings
The present invention is further illustrated in conjunction with embodiment below with reference to accompanying drawing.
Fig. 1 is the circuit block diagram of controller for power supply of display of the present invention.
Fig. 2 is the circuit diagram of Fig. 1.
Embodiment
Please refer to Fig. 1, controller for power supply of display of the present invention is used for controlling automatically the break-make of a display (as a LCD) power supply, its better embodiment comprises a VGA (Video Graphics Array, video graphics array) signaling interface 10, a sample circuit 20, a control circuit 30, a display power supply rectification circuit 40 and an AC power interface 50.Described VGA signaling interface 10 is connected on the host computer (not shown) corresponding interface.Described sample circuit 20, control circuit 30 and display power supply rectification circuit 40 all are arranged on the interior circuit board (not shown) of display, after taking a sample, the voltage signal that described sample circuit 20 receives described VGA signaling interface 10 is transferred to described control circuit 30, control the break-make of described display power supply rectification circuit 40 by the control signal of described control circuit 30 outputs, thereby control the break-make of display power supply.
Please continue with reference to figure 2, described sample circuit 20 is used for ac voltage signal that the red heart yearn pin P with described VGA signaling interface 10 receives and takes a sample and convert d. c. voltage signal to, it comprises a diode D1, a capacitor C 1 and a variable resistor R1, the anode of described diode D1 meets the red heart yearn pin P in the described VGA signaling interface 10, is connected between the negative electrode and ground of described diode D1 after described capacitor C 1 and the described variable resistor R1 parallel connection.
Described control circuit 30 is used to control the break-make of display power supply rectification circuit 40, it comprises a comparer U1, the in-phase input end of described comparer U1 connects the adjustment end of described variable resistor R1, and its inverting input is connected to a power end (not shown) of described display interior so that a direct current reference voltage Vref to be provided.
Described display power supply rectification circuit 40 is used for coming break-make display power supply rectification circuit 40 and an alternating voltage being carried out rectification according to the control signal of described control circuit 30 outputs, and it comprises a transformer Q, two diode D2, D3 and two thyristor T1, T2 that can turn-off.The negative electrode of described diode D2 links to each other with the anode of described thyristor T1, the negative electrode of described diode D3 links to each other with the anode of described thyristor T2, the anode of described two diode D1, D2 links to each other and as an output terminal of described display power supply rectification circuit 40, the negative electrode of described two thyristors links to each other and as another output terminal of described display power supply rectification circuit 40, two output terminals of described display power supply rectification circuit 40 connect the subsequent conditioning circuit (not shown) of display power supply, and the gate pole of described two thyristor T1, T2 all is connected to the output terminal of described comparer U1.The secondary coil of described transformer Q is connected respectively on the node of the node of described diode D2 and described thyristor T1 and described diode D3 and described thyristor T2, the two ends of the primary coil of described transformer Q connect described AC power interface 50, and described AC power interface 50 connects a 220V AC power and voltage is provided for described display power supply rectification circuit 40.
The R1 of variable resistor described in the present embodiment can adjust its resistance value to play the effect of described display power supply rectification circuit 40 break-makes of control according to the magnitude of voltage of the reference voltage Vref of the inverting input of described comparer U1.If the DC voltage after the alternating voltage at the red heart yearn pin P place in the described VGA signaling interface 10 is taken a sample through described diode D1 has met the requirement of subsequent conditioning circuit, then can omit variable resistor R1, described capacitor C 1 plays filter action, also can omit for saving cost, the anode of described diode D1 also can connect the pin that in the described VGA signaling interface 10 other can receive the alternating voltage that main frame produces, and is not limited only to the red heart yearn pin P in the present embodiment.
When host computer is opened, will there be an alternating voltage by described host computer generation in red heart yearn pin P place in the described VGA signaling interface 10, described alternating voltage is through diode D1 rectification sampling, pass through capacitor C 1 filtering again, be input to the in-phase input end of described comparer U1 after the variable resistor R1 dividing potential drop, this moment, the in-phase input end of comparer U1 was a high level, and display is in closed condition, its inner DC voltage is 0, the reference voltage Vref that is the inverting input of described comparer U1 is a low level, the output terminal of described comparer U1 is output as high level, described thyristor T1, the gate pole of T2 is high level, described thyristor T1, the T2 conducting, display power supply rectification circuit 40 is started working under described 220V alternating voltage, so display is opened.
When host computer is closed, the ac voltage signal at the red heart yearn pin P place in the described VGA signaling interface 10 is 0, the voltage that sample circuit 20 outputs to the comparer U1 in-phase input end of control circuit 30 is 0, this moment, display still was in opening, its inner DC voltage still exists, the reference voltage Vref of inverting input that is the inverting input of described comparer U1 is a high level, the output terminal output low level of then described comparer U1, described thyristor T1, the gate pole of T2 is low level, described thyristor T1, T2 ends, display power supply rectification circuit 40 quits work, described 220V alternating voltage can't arrive the subsequent conditioning circuit of display power supply, so display is closed.
Use effectively energy savings of described controller for power supply of display, but also the serviceable life of having improved display.Described display is generally liquid crystal display device, can also be other display device, as CRT monitor.
Claims (6)
- [claim 1] a kind of controller for power supply of display, comprise a signaling interface and an AC power interface, it is characterized in that: described controller for power supply of display also comprises a sample circuit, one control circuit and a display power supply rectification circuit, the input end of described display power supply rectification circuit connects described AC power interface, described AC power interface is used to provide the power supply of display, the input end of described sample circuit links to each other with a pin in the described signaling interface to receive an alternating voltage and to the input end of described ac voltage rectifier sampling back output one direct current voltage to described control circuit, after described control circuit receives described DC voltage, with described DC voltage and a reference voltage compares and the control end that controls signal to described display power supply rectification circuit according to comparative result output one with the break-make of controlling described display power supply rectification circuit and then the break-make of control display power supply.
- [claim 2] controller for power supply of display as claimed in claim 1, it is characterized in that: described sample circuit comprises a diode, its anode connects red heart yearn pin in the described signaling interface as the input end of sample circuit, and its negative electrode connects the input end of described control circuit as the output terminal of sample circuit.
- [claim 3] controller for power supply of display as claimed in claim 1, it is characterized in that: described sample circuit comprises a diode and a variable resistor, the anode of described diode connects red heart yearn pin in the described signaling interface as the input end of sample circuit, its negative electrode is by described variable resistor ground connection, and described variable-resistance adjustment end connects the input end of described control circuit as the output terminal of described sample circuit.
- [claim 4] controller for power supply of display as claimed in claim 3 is characterized in that: described sample circuit also comprises an electric capacity, and described electric capacity is connected between the negative electrode and ground of described diode.
- [claim 5] is as each described controller for power supply of display in the claim 1 to 4, it is characterized in that: described control circuit comprises a comparer, its in-phase input end is as the input end of described control circuit, its inverting input connects described reference voltage, and its output terminal connects the control end of described display power supply rectification circuit as the output terminal of described control circuit.
- [claim 6] controller for power supply of display as claimed in claim 1, it is characterized in that: described display power supply rectification circuit comprises a transformer, two thyristors and two diodes, the gate pole of described two thyristors is as the control end of described display power supply rectification circuit, the anode of described two diodes links to each other as an output terminal of described display power supply rectification circuit, negative electrode connects the anode of two thyristors respectively, the negative electrode of described two thyristors links to each other as another output terminal of described display power supply rectification circuit, the primary coil of described transformer connects described AC power interface, and the two ends of its secondary coil are connected respectively to the connected node of two thyristors and corresponding diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810300513A CN101533634A (en) | 2008-03-11 | 2008-03-11 | Display power source control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810300513A CN101533634A (en) | 2008-03-11 | 2008-03-11 | Display power source control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101533634A true CN101533634A (en) | 2009-09-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810300513A Pending CN101533634A (en) | 2008-03-11 | 2008-03-11 | Display power source control device |
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| Country | Link |
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| CN (1) | CN101533634A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109427305A (en) * | 2017-09-05 | 2019-03-05 | 京东方科技集团股份有限公司 | Control circuit, display device and the method for the light source power supply into display device |
-
2008
- 2008-03-11 CN CN200810300513A patent/CN101533634A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109427305A (en) * | 2017-09-05 | 2019-03-05 | 京东方科技集团股份有限公司 | Control circuit, display device and the method for the light source power supply into display device |
| US11355073B2 (en) | 2017-09-05 | 2022-06-07 | Beijing Boe Optoelectronics Technology Co., Ltd. | Control circuit, display apparatus and method for supplying power to light source in display apparatus |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090916 |