CN101399008A - Converter circuit with restart function and relevant display apparatus - Google Patents
Converter circuit with restart function and relevant display apparatus Download PDFInfo
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- CN101399008A CN101399008A CNA2007101532091A CN200710153209A CN101399008A CN 101399008 A CN101399008 A CN 101399008A CN A2007101532091 A CNA2007101532091 A CN A2007101532091A CN 200710153209 A CN200710153209 A CN 200710153209A CN 101399008 A CN101399008 A CN 101399008A
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Abstract
The invention relates to a converter circuit, comprising a detection circuit, a pulse duration modulating circuit, a control circuit, a switching circuit and a power switching circuit. The detection circuit generates a first control signal or a second control signal according to a laden voltage level; when receiving the first control signal, the pulse duration modulating circuit outputs a power switching control signal or stops working when receiving the second control signal; the control circuit outputs a backlight closing signal after receiving the second control signal, and then outputs a backlight starting signal after outputting the backlight closing signal; the switching circuit stops working after receiving the backlight closing signal and restarts the pulse duration modulating circuit after receiving the backlight starting signal; The power switching circuit is used for providing voltage needed when load operation according to power control signals.
Description
Technical field
The present invention relates to a kind of converter circuit, particularly a kind of converter circuit with restart facility.
Background technology
Converter circuit (inverter circuit) can be converted to AC power with direct supply, therefore is commonly used to drive the fluorescent tube that light source can be provided in the display device.Whether converter circuit can detect can successfully light fluorescent tube, if still can't light fluorescent tube after surpassing a schedule time, and meeting this moment trigger protection circuit, and then interrupt the running of converter circuit.
Please refer to Fig. 1, Fig. 1 is the synoptic diagram of a converter circuit 100 in the display device of prior art, converter circuit 100 be will input power supply 12 conversions drive fluorescent tube 11, the back light of panel is provided.Converter circuit 100 comprises a power-switching circuit (power transfer circuit) 13, one testing circuit 14, and a pulse-length modulation (pulse width modulation, PWM) circuit 15.Power-switching circuit 13 is controlled by pulse width modulation circuit 15, a power supply 12 can be converted to light the required voltage vcc of a fluorescent tube 11.Testing circuit 14 can detect a signal and offer pulse width modulation circuit 15 to judge whether fluorescent tube 11 is lighted, if fluorescent tube 11 is successfully lighted, this moment, testing circuit 14 can be sent a corresponding control signal Sct to pulse width modulation circuit 15, pulse width modulation circuit 15 is controlled power-switching circuit 13 more according to this, makes that converter circuit 100 can normal operations; If fluorescent tube 11 is not successfully lighted, this moment, testing circuit 14 can be sent a corresponding control signal Sct to pulse width modulation circuit 15, the pulse width modulation circuit 15 powered-down change-over circuit 13 simultaneously that quits work according to this again, converter circuit 100 will no longer operate this moment.
In the converter circuit 100 of prior art, if fluorescent tube 11 can't be lighted in Preset Time because of unusual the interference, this moment, pulse width modulation circuit 15 can be closed, the user must be about to power supply 12 certainly and turn off and restart power supply 12, could attempt lighting fluorescent tube 11 once more, cause operation inconvenience.
Summary of the invention
The invention provides a kind of converter circuit with restart facility, it comprises a testing circuit, is used for detecting the current level of a load, and produces corresponding one first control signal or one second control signal according to this; One pulse width modulation circuit is coupled to this testing circuit, is used for exporting a control signal when receiving this first control signal, or decommissions after one first schedule time when receiving this second control signal; One control circuit is coupled to this testing circuit, is used for exporting a shutdown signal backlight when receiving this second control signal after one second schedule time, and exports a backlight open signal after this shutdown signal backlight of output after one the 3rd schedule time; One on-off circuit is coupled to this pulse width modulation circuit and this control circuit, is used for making the pulse width modulation circuit decommissioning after receiving this shutdown signal backlight, and restarts this pulse width modulation circuit after receiving this backlight open signal; And a power-switching circuit, be coupled to this pulse width modulation circuit, required voltage when being used for providing this load operation according to this power control signal.
The present invention provides a kind of display device with restart facility in addition, and it comprises a panel; One light source places a side of this panel; One power supply, required voltage when being used to provide the running of this light source; And a converter circuit, it comprises a testing circuit, is used for detecting the current level of this light source, and produces corresponding one first control signal or one second control signal according to this; One pulse width modulation circuit is coupled to this testing circuit, is used for exporting a power source conversion control signal when receiving this first control signal, or decommissions after one first schedule time when receiving this second control signal; One control circuit is coupled to this testing circuit, is used for exporting a shutdown signal backlight when receiving this second control signal after one second schedule time, and exports a backlight open signal after this shutdown signal backlight of output after one the 3rd schedule time; One on-off circuit is coupled to this pulse width modulation circuit and this control circuit, is used for this pulse width modulation circuit decommissioning after receiving this shutdown signal backlight, and restarts this pulse width modulation circuit after receiving this backlight open signal; And a power-switching circuit, be coupled to this pulse width modulation circuit, be used for changing this power supply to provide this light source running required voltage according to this power source conversion control signal.
Description of drawings
Fig. 1 is the synoptic diagram of a converter circuit in the display device of prior art.
Fig. 2 is the synoptic diagram of a converter circuit in the display device of the present invention.
Fig. 3 is the circuit diagram of testing circuit in one embodiment of the invention.
The reference numeral explanation
100,200 converter circuits
11,21 fluorescent tubes, 12,22 power supplys
13,23 power-switching circuits, 14,24 testing circuits
26 on-off circuits, 27 microcontrollers
Q1, Q2 transistor D1-D2 diode
R1-R2 resistance C electric capacity
15,25 pulse width modulation circuits.
Embodiment
Please refer to Fig. 2, Fig. 2 is the synoptic diagram of a converter circuit 200 in the display device of the present invention, and converter circuit 200 drives fluorescent tube 21 with power supply 22 conversions of input, and the back light of panel is provided.Converter circuit 200 comprises a power-switching circuit 23, a testing circuit 24, a pulse width modulation circuit 25, an on-off circuit 26, and a microcontroller (microcontroller unit, MCU) 27.Power-switching circuit 23 is controlled by pulse width modulation circuit 25, a power supply 22 can be converted to light the light source voltage vcc required as a fluorescent tube 21.Testing circuit 24 can detect a signal and offer pulse width modulation circuit 25 to judge whether fluorescent tube 21 is lighted, if fluorescent tube 21 is successfully lighted, this moment, testing circuit 24 can be sent a corresponding control signal Sct to pulse width modulation circuit 25, pulse width modulation circuit 25 is controlled power-switching circuit 23 more according to this, makes that converter circuit 200 can normal operations; If fluorescent tube 21 is not successfully lighted, this moment, testing circuit 24 can be sent a corresponding control signal Sct to pulse width modulation circuit 25 and microcontroller 27.After receiving the control signal Sct that testing circuit 24 transmits, pulse width modulation circuit 25 meeting powered-down change-over circuits 23, and microcontroller 27 can send one and cuts out (backlight off) backlight signal with off switch circuit 26, pulse width modulation circuit 25 meetings this moment thereby releasing everything, and converter circuit 200 will no longer operate.Again through after the schedule time, microcontroller 27 can be sent one and open (backlight on) backlight signal to open on-off circuit 26, makes pulse width modulation circuit 25 to operate again and attempts lighting fluorescent tube 21 once again.If attempt still can't successfully lighting fluorescent tube behind the pre-determined number, microcontroller 27 will no longer be sent the unlatching backlight signal this moment.
Please refer to Fig. 3, Fig. 3 is the circuit diagram of testing circuit 24 in one embodiment of the invention.In the embodiments of figure 3, the input end of testing circuit 24 is coupled to fluorescent tube 21, and output terminal is coupled to pulse width modulation circuit 25 and microcontroller 27.Testing circuit 24 comprise transistor Q1 and Q2, diode D1-D2, resistance R 1-R2, capacitor C-etc. element.When a termination of fluorescent tube 21 is received voltage vcc and when successfully being lighted, fluorescent tube 21 can produce a scheduled current, this scheduled current is gone up in end points N1 by resistance R 1 and to be formed a voltage level behind diode D1.This moment, the grid of transistor Q1 had noble potential, but therefore turn-on transistor Q1, and the transistor Q1 of the current potential that the grid of transistor Q2 produces because of Vref and R2 by conducting is pulled to earthing potential, and then close transistor Q2.Therefore, testing circuit 24 can will have the feedback signal S of noble potential
FBReach pulse width modulation circuit 25.
On the other hand, when a termination of fluorescent tube 21 is received voltage vcc but can't successfully be lighted, so fluorescent tube 21 can not produce predetermined voltage level because of no current flows on resistance R 1, therefore, the grid of transistor Q1 is an electronegative potential, and transistor Q1 is also for closing simultaneously.At this moment, reference voltage V
RefCan come turn-on transistor Q2 by resistance R 2, the output terminal of testing circuit 24 is pulled to earthing potential by the transistor Q2 of conducting, and testing circuit 24 can't be with feedback signal S
FBReach pulse width modulation circuit 25.
Therefore; in display device of the present invention; if fluorescent tube 21 just is interfered in the time can't lighting smoothly for the first time; can have an opportunity second or successfully light for the third time; and the failure of can once not lighting a lamp is just because of the protected situation that can't move fully of fluorescent tube circuit, and the user also must not be about to power supply 22 certainly and turn off and restart power supply 22 and could attempt lighting fluorescent tube 21 once more.
The above only is preferred embodiment of the present invention, and all equalizations of being done according to the present patent application claim change and modify, and all should belong to covering scope of the present invention.
Claims (5)
1. display device with restart facility, it comprises:
Panel;
Light source places a side of this panel;
Power supply, required voltage when being used to provide the running of this light source; And
Converter circuit, it comprises:
Testing circuit is used for detecting the current level of this light source, and produces corresponding first control signal or second control signal according to this;
Pulse width modulation circuit is coupled to this testing circuit, is used for exporting a power control signal when receiving this first control signal, or decommissions after first schedule time when receiving this second control signal;
Control circuit is coupled to this testing circuit, is used for exporting a shutdown signal backlight when receiving this second control signal after one second schedule time, and exports a backlight open signal after this shutdown signal backlight of output after one the 3rd schedule time;
On-off circuit is coupled to this pulse width modulation circuit and this control circuit, is used for after receiving this shutdown signal backlight pulse width modulation circuit being decommissioned, and restarts this pulse width modulation circuit after receiving this backlight open signal; And
Power-switching circuit is coupled to this pulse width modulation circuit, is used for changing this power supply to provide this light source running required voltage according to this power control signal.
2. display device as claimed in claim 1, wherein, this control circuit is a microcontroller.
3. display device as claimed in claim 1, wherein, this testing circuit comprises elements such as transistor, diode, resistance and electric capacity.
4. display device as claimed in claim 1, wherein, this testing circuit produces to have first control signal of noble potential or has second control signal of electronegative potential.
5. display device as claimed in claim 1, wherein, this light source is a fluorescent tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101532091A CN101399008B (en) | 2007-09-29 | 2007-09-29 | Converter circuit with restart function and relevant display apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007101532091A CN101399008B (en) | 2007-09-29 | 2007-09-29 | Converter circuit with restart function and relevant display apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101399008A true CN101399008A (en) | 2009-04-01 |
| CN101399008B CN101399008B (en) | 2010-09-15 |
Family
ID=40517524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007101532091A Expired - Fee Related CN101399008B (en) | 2007-09-29 | 2007-09-29 | Converter circuit with restart function and relevant display apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101399008B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102842287A (en) * | 2011-06-20 | 2012-12-26 | 国琏电子（上海）有限公司 | Light emitting diode drive system and display device using same |
| CN102890914A (en) * | 2011-07-18 | 2013-01-23 | 国琏电子（上海）有限公司 | Light emitting diode drive system and display device using light emitting diode drive system |
| CN103853301A (en) * | 2012-11-30 | 2014-06-11 | 英业达科技有限公司 | Server system and automatic reset method thereof |
| CN104571434A (en) * | 2013-10-22 | 2015-04-29 | 英业达科技有限公司 | Server and reboot method thereof |
| CN110910848A (en) * | 2019-11-28 | 2020-03-24 | Tcl华星光电技术有限公司 | Driving circuit and driving method of liquid crystal display |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100892584B1 (en) * | 2002-08-26 | 2009-04-08 | 삼성전자주식회사 | Apparatus for providing power, backlight assembly and liquid crystal display having the same |
| KR100643246B1 (en) * | 2005-05-31 | 2006-11-10 | 삼성전자주식회사 | Display apparatus |
-
2007
- 2007-09-29 CN CN2007101532091A patent/CN101399008B/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102842287A (en) * | 2011-06-20 | 2012-12-26 | 国琏电子（上海）有限公司 | Light emitting diode drive system and display device using same |
| CN102890914A (en) * | 2011-07-18 | 2013-01-23 | 国琏电子（上海）有限公司 | Light emitting diode drive system and display device using light emitting diode drive system |
| CN103853301A (en) * | 2012-11-30 | 2014-06-11 | 英业达科技有限公司 | Server system and automatic reset method thereof |
| CN104571434A (en) * | 2013-10-22 | 2015-04-29 | 英业达科技有限公司 | Server and reboot method thereof |
| CN110910848A (en) * | 2019-11-28 | 2020-03-24 | Tcl华星光电技术有限公司 | Driving circuit and driving method of liquid crystal display |
| US11289040B2 (en) | 2019-11-28 | 2022-03-29 | Tcl China Star Optoelectronics Technology Co., Ltd. | Driving circuit and driving method of liquid crystal display |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101399008B (en) | 2010-09-15 |
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