CN101763810B - Control method of timing sequence of switching power supply of plasma display - Google Patents
Control method of timing sequence of switching power supply of plasma display Download PDFInfo
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- CN101763810B CN101763810B CN 200910210665 CN200910210665A CN101763810B CN 101763810 B CN101763810 B CN 101763810B CN 200910210665 CN200910210665 CN 200910210665 CN 200910210665 A CN200910210665 A CN 200910210665A CN 101763810 B CN101763810 B CN 101763810B
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Abstract
The invention provides a control method of the timing sequence of a switching power supply of a plasma display, which comprises the following steps of: sampling the voltage of the switching power supply of a display, using the sampled voltage as an input signal of a single chip, determining the timing sequence of switching power supply by the single chip according to the input signal, emitting a timing sequence controlling signal, controlling the connection or disconnection of an electrical relay connected with the single chip according to the timing sequence controlling signal, and controlling the switching power supply of the display by the enabling end of a power supply chip connected with the electrical relay according to the connection or disconnection of the electrical relay.
Description
Technical field
The present invention relates to the plasma display field, in particular to a kind of control method of timing sequence of switching power supply of plasma display.
Background technology
Colour plasma display (PDP, Plasma Display Panel) is a kind of display device that developed rapidly in recent years.Colour plasma display becomes the first-selection of large screen display device with superior performance; The large-sized solor plasma display device has begun to come into the market at present; Especially AC type AC-PDP has advantages such as type of drive is simple and obtains extensive studies and application, and in recent years, can progressively be popularized.
In general AC-PDP has various structure according to the difference of its type of drive, but electric pressure as a rule commonly used has only three the tunnel, i.e. logic voltage Vcc (about 5V), addressing voltage Va (about 65V) and keep voltage Vs (about 170V).In order to guarantee the reliability of PDP screen work, driving circuit has the certain sequence requirement to the voltage of power supply output.Power-up sequence is that first output logic voltage vcc arrives the screen load, exports addressing voltage Va then, and voltage Vs is kept in output at last.Shutdown is in proper order for closing the output of Vcc after the output of closing Vs and Va earlier.Follow low earlier back height when powering in a word, the low principle in high earlier back during power down.
In the prior art plasma display power source special realize the method for this purpose a kind of be the Enable Pin that after the output voltage on each road is sampled sampled signal is fed back to power supply control chip after through the circuit conversion; After judging voltage output, carry out the open-minded of next voltage again; A kind of in addition method commonly used is with the input of sampled voltage as single-chip microcomputer; The output of single-chip microcomputer connects the Enable Pin of power supply control chip, through the programmed control output timing of single-chip microcomputer.
The inventor finds that in the prior art the programmed control output timing low earlier back when realizing powering on through single-chip microcomputer is high; The low principle in high earlier back during power down, the output of all power supplys descends simultaneously during power remove, because the delayed-action of electric capacity; It is slow that the voltage of keeping voltage Vs part voltage suppression ratio logic voltage Vcc and addressing voltage Va part that capacity is bigger descends; Can cause Vcc and Va to drop to zero earlier, and Vs also have voltage, has satisfied not the requirement of sequential.
Summary of the invention
The present invention aims to provide a kind of control method of timing sequence of switching power supply of plasma display; Programmed control output timing low earlier back when realizing powering on that can solve in the prior art through single-chip microcomputer is high; The low principle in high earlier back during power down, the output of all power supplys descends simultaneously during power remove, because the delayed-action of electric capacity; It is slow that the voltage of keeping voltage Vs part voltage suppression ratio logic voltage Vcc and addressing voltage Va part that capacity is bigger descends; Can cause Vcc and Va to drop to zero earlier, and Vs also have voltage, has satisfied not the problem of the requirement of sequential.
In an embodiment of the present invention, a kind of control method of timing sequence of switching power supply of plasma display is provided, has may further comprise the steps:
Supply voltage switch to display is sampled, with the input signal of sampled voltage as single-chip microcomputer;
Single-chip microcomputer is confirmed the sequential of power switch according to input signal, sends timing control signal;
Single-chip microcomputer perhaps cuts out according to the coupled relay conducting that connects of timing control signal control;
The power supply chip Enable Pin that is connected with relay is perhaps closed the control of realization to the monitor switch power supply according to the conducting of relay.
Preferably; In the control method of above-mentioned timing sequence of switching power supply of plasma display; Single-chip microcomputer specifically comprises according to the coupled cut-off that connects of timing control signal control: the output terminal in Switching Power Supply connects relay; When power down,, make the external output voltage of power supply reduce to zero at once through breaking off relay.
Preferably; In the control method of above-mentioned timing sequence of switching power supply of plasma display; Single-chip microcomputer also comprises according to the coupled cut-off that connects of timing control signal control: when power down, with energy stored in the electric capacity that Switching Power Supply is connected through discharging with the electric capacity load in parallel.
Preferably, in the control method of above-mentioned timing sequence of switching power supply of plasma display, supply voltage switch specifically comprises: logic voltage, addressing voltage and keep voltage.
Preferably, in the control method of above-mentioned timing sequence of switching power supply of plasma display, its, relay is the normal off relay.
In the above-described embodiments; Relay conducting through the control according to timing control signal is connected with single-chip microcomputer is perhaps closed, and makes the power supply chip Enable Pin that is connected with relay perhaps close the control of realization to the monitor switch power supply according to the conducting of relay, thereby when power remove; Can not take place chaotic because of the order that delayed-action is closed Switching Power Supply; Make Switching Power Supply open or close according to the sequential of setting, the programmed control output timing low earlier back when realizing powering on that has overcome in the prior art through single-chip microcomputer is high, the low principle in high earlier back during power down; The output of all power supplys descends simultaneously during power remove; Because the delayed-action of electric capacity, it is slow that the voltage of keeping voltage Vs part voltage suppression ratio logic voltage Vcc and addressing voltage Va part that capacity is bigger descends, and can cause Vcc and Va to drop to zero earlier; And Vs also has voltage, has satisfied not the problem of the requirement of sequential.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 shows the control method process flow diagram of timing sequence of switching power supply of plasma display according to an embodiment of the invention;
Fig. 2 shows circuit according to an embodiment of the invention and connects synoptic diagram.
Embodiment
Below with reference to accompanying drawing and combine embodiment, specify the present invention.
Fig. 1 shows the control method process flow diagram of timing sequence of switching power supply of plasma display according to an embodiment of the invention, may further comprise the steps:
S102 samples to the supply voltage switch of display, with the input signal of sampled voltage as single-chip microcomputer;
S104, single-chip microcomputer is confirmed the sequential of power switch according to input signal, sends timing control signal;
S106, single-chip microcomputer perhaps cuts out according to the coupled relay conducting that connects of timing control signal control;
S108, the power supply chip Enable Pin that is connected with relay is perhaps closed the control of realization to the monitor switch power supply according to the conducting of relay.
In the present embodiment; Relay conducting through the control according to timing control signal is connected with single-chip microcomputer is perhaps closed, and makes the power supply chip Enable Pin that is connected with relay perhaps close the control of realization to the monitor switch power supply according to the conducting of relay, thereby when power remove; Can not take place chaotic because of the order that delayed-action is closed Switching Power Supply; Make Switching Power Supply open or close according to the sequential of setting, the programmed control output timing low earlier back when realizing powering on that has overcome in the prior art through single-chip microcomputer is high, the low principle in high earlier back during power down; The output of all power supplys descends simultaneously during power remove; Because the delayed-action of electric capacity, it is slow that the voltage of keeping voltage Vs part voltage suppression ratio logic voltage Vcc and addressing voltage Va part that capacity is bigger descends, and can cause Vcc and Va to drop to zero earlier; And Vs also has voltage, has satisfied not the problem of the requirement of sequential.
Preferably; In the control method of above-mentioned timing sequence of switching power supply of plasma display; Single-chip microcomputer specifically comprises according to the coupled cut-off that connects of timing control signal control: the output terminal in Switching Power Supply connects relay; When power down,, make the external output voltage of power supply reduce to zero at once through breaking off relay.After each road output of single-chip microcomputer, connect a relay, directly come the conducting and the shutoff of pilot relay with the output terminal of single-chip microcomputer.
Preferably; In the control method of above-mentioned timing sequence of switching power supply of plasma display; Single-chip microcomputer also comprises according to the coupled cut-off that connects of timing control signal control: when power down, with energy stored in the electric capacity that Switching Power Supply is connected through discharging with the electric capacity load in parallel.It is as shown in Figure 2 that relay circuit connects synoptic diagram, and omit on the former limit of power circuit, and relay CONTROL (control) end is electrically connected with the single-chip microcomputer output terminal; Another input end is connected with the Switching Power Supply secondary circuit; After the power supply silence signal arrives, make the high level of CONTROL end become low level, the two ends of normal off relay K are broken off; Output voltage reduces to 0 at once, and the capacitor C energy stored discharges through fictitious load R.In sequential control method, adopt this kind circuit connecting mode, sequential meets the demands fully when making power down, and electrifying timing sequence is unaffected.
Preferably, in the control method of above-mentioned timing sequence of switching power supply of plasma display, supply voltage switch specifically comprises: logic voltage, addressing voltage and keep voltage.
Preferably, in the control method of above-mentioned timing sequence of switching power supply of plasma display, its, relay is the normal off relay.The uncontrolled sequential that causes of control circuit was chaotic when the use of normal off relay can be avoided accident power-off.The simple and practical easy realization of circuit part that increases can not impact original circuit on the basis that does not change primary circuit.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. the control method of a timing sequence of switching power supply of plasma display is characterized in that, may further comprise the steps:
Supply voltage switch to display is sampled, with the input signal of sampled voltage as single-chip microcomputer;
Said single-chip microcomputer is confirmed the sequential of power switch according to said input signal, sends timing control signal;
Said single-chip microcomputer perhaps cuts out according to the coupled relay conducting that connects of said timing control signal control;
The power supply chip Enable Pin that is connected with said relay is perhaps closed the control of realization to the monitor switch power supply according to the conducting of said relay, wherein,
Said single-chip microcomputer specifically comprises according to the coupled cut-off that connects of said timing control signal control: the output terminal in said Switching Power Supply connects said relay; When power down, pass through to break off said relay; Make the external output voltage of power supply reduce to zero at once; When power down, with energy stored in the electric capacity that said Switching Power Supply is connected through discharging with said electric capacity load in parallel.
2. the control method of timing sequence of switching power supply of plasma display according to claim 1 is characterized in that, said supply voltage switch specifically comprises:
Logic voltage, addressing voltage and keep voltage.
3. the control method of timing sequence of switching power supply of plasma display according to claim 1 is characterized in that, said relay is the normal off relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910210665 CN101763810B (en) | 2009-11-05 | 2009-11-05 | Control method of timing sequence of switching power supply of plasma display |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910210665 CN101763810B (en) | 2009-11-05 | 2009-11-05 | Control method of timing sequence of switching power supply of plasma display |
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| Publication Number | Publication Date |
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| CN101763810A CN101763810A (en) | 2010-06-30 |
| CN101763810B true CN101763810B (en) | 2012-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200910210665 Expired - Fee Related CN101763810B (en) | 2009-11-05 | 2009-11-05 | Control method of timing sequence of switching power supply of plasma display |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US9220132B2 (en) * | 2013-06-22 | 2015-12-22 | Robert G. Marcotte | Breakover conduction illumination devices and operating method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1143788A (en) * | 1995-05-12 | 1997-02-26 | 索尼株式会社 | Method of driving plasma addressed display panel |
| JP2003345296A (en) * | 2002-05-27 | 2003-12-03 | Matsushita Electric Ind Co Ltd | Plasma display device |
| CN1877673A (en) * | 2006-06-29 | 2006-12-13 | 彩虹集团电子股份有限公司 | Method for reducing standby power consumption of resonant plasma display power supply |
-
2009
- 2009-11-05 CN CN 200910210665 patent/CN101763810B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1143788A (en) * | 1995-05-12 | 1997-02-26 | 索尼株式会社 | Method of driving plasma addressed display panel |
| JP2003345296A (en) * | 2002-05-27 | 2003-12-03 | Matsushita Electric Ind Co Ltd | Plasma display device |
| CN1877673A (en) * | 2006-06-29 | 2006-12-13 | 彩虹集团电子股份有限公司 | Method for reducing standby power consumption of resonant plasma display power supply |
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| CN101763810A (en) | 2010-06-30 |
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