CN101060740B - Discharge lamp drive device - Google Patents
Discharge lamp drive device Download PDFInfo
- Publication number
- CN101060740B CN101060740B CN2006100604064A CN200610060406A CN101060740B CN 101060740 B CN101060740 B CN 101060740B CN 2006100604064 A CN2006100604064 A CN 2006100604064A CN 200610060406 A CN200610060406 A CN 200610060406A CN 101060740 B CN101060740 B CN 101060740B
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- discharge lamp
- circuit
- driven apparatus
- signal
- secondary output
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Abstract
The drive device for discharge lamp comprises: a power conversion circuit conversing received signal into ac signal, a transformation resonant circuit including a transformer and a capacitor for boosting up the ac signal, and a PWM controller for controlling ac signal, wherein the capacitor connects between the high and low voltage ends of secondary side of the transformer. This invention reduces stray current, and provides precise feedback signal.
Description
[technical field]
The present invention relates to a kind of discharge lamp driven apparatus, relate in particular to a kind of LCD (liquidcrystal display, LCD) discharge lamp driven apparatus of backlight module of being applied to.
[background technology]
At present, the panel of LCD (LCD) mainly adopts discharge lamp (Discharge Lamp) as backlight, and this kind discharge lamp needs higher driving voltage just can light.In order to ensure the operate as normal of discharge lamp, and make electric current maintain steady state value, need the electric current of feedback circuit feedback flow usually, judge the operating state of discharge lamp with this through discharge lamp by it.
Figure 1 shows that existing discharge lamp driven apparatus, this existing discharge lamp driven apparatus comprises power-switching circuit 11, transformation resonance circuit 12, resonant circuit 13, feedback circuit 14, PWM controller 15 and discharge lamp L1.
Wherein, transformation resonance circuit 12 comprises transformer T1 and capacitor C 11, and capacitor C 11 is connected between transformer T1 secondary winding high-pressure side and the ground, and the leakage inductance of itself and transformer T1 can play the effect of resonance.Resonant circuit 13 comprises inductance L 11 and resonant capacitance C12 and C13.Wherein, resonant capacitance C12 and C13 are connected in series between transformer T1 secondary winding high-pressure side and ground, and inductance L 11 is connected between transformer T1 secondary winding high-pressure side and the resonant capacitance C12.
In discharge lamp driven apparatus, each several part circuit and LCD panel enclosure all can produce stray electrical current (stray current) between (can regard as with reference to ground), thereby make the electric current that not only comprises the discharge lamp L1 that flows through in the current feedback signal, the stray electrical current that also comprises whole circuit and produced.So, in the whole discharge lamp driven apparatus, capacitor C 11, the stray electrical current that C12 and C13 produced are bigger, thereby it is bigger for the current feedback signal error effect.
[summary of the invention]
In view of this, need provide a kind of discharge lamp driven apparatus, reduce the influence of stray electrical current, improve the accuracy of current feedback signal the discharge lamp current feedback signal.
A kind of discharge lamp driven apparatus is used to drive discharge lamp, comprises power-switching circuit, transformation resonance circuit, PWM controller and at least one resonant circuit.The conversion of signals that power-switching circuit is used for receiving is an AC signal.Transformation resonance circuit this AC signal that is used to boost, it comprises transformer and electric capacity.Transformer has elementary winding and secondary winding, and electric capacity is connected between this transformer secondary output winding high-pressure side and the low-pressure end.The PWM controller is connected in power-switching circuit, is used to control the size of power-switching circuit output AC signal.Resonant circuit is connected between transformer secondary output winding high-pressure side and the low-pressure end, is used for the AC signal after boosting is converted to the AC signal that can drive discharge lamp.Each resonant circuit comprises inductance and resonant capacitance.Wherein, inductance is connected between transformer secondary output winding high-pressure side and the discharge lamp.Resonant capacitance is connected between discharge lamp and the transformer secondary output winding low-pressure end.Described resonant capacitance is an embedded capacitance.
In the transformation resonance circuit of the present invention, electric capacity is connected between transformer secondary output winding high-pressure side and the low-pressure end, reduces the stray electrical current that produces between transformation resonance circuit and the LCD panel housing, makes the discharge lamp current feedback signal comparatively accurate.
[description of drawings]
Fig. 1 is existing discharge lamp driven apparatus.
Fig. 2 is the discharge lamp driven apparatus of an embodiment of the present invention.
Fig. 3 is the discharge lamp driven apparatus of another execution mode of the present invention.
[embodiment]
Fig. 2 is the discharge lamp driven apparatus of an embodiment of the present invention, and this discharge lamp driven apparatus comprises power-switching circuit 21, transformation resonance circuit 22, resonant circuit 23, feedback circuit 24, PWM controller 25 and discharge lamp L2.
The conversion of signals that power-switching circuit 21 is used for receiving is an AC signal, and this AC signal is a square-wave signal.
In the present embodiment, resonant circuit 23 also comprises resonant capacitance C23, and it is electrically connected between resonant capacitance C22 and the transformer T2 secondary winding low-pressure end.
In the present embodiment, feedback circuit 24 comprises another filter circuit, and it comprises filter capacitor C24 and resistance R 22.Wherein, filter capacitor C24 and resistance R 22 are connected in series, and are connected between transformer T1 secondary winding low-pressure end and the ground, are used for the noise of filtering discharge lamp L2 current feedback signal equally.In the present embodiment, described filter circuit is used for the noise of filtering different frequency, makes that discharge lamp L2 current feedback signal is more accurate.
Consult the discharge lamp driven apparatus of Fig. 3 for another execution mode of the present invention, this discharge lamp driven apparatus and discharge lamp driven apparatus shown in Figure 2 are roughly the same, and difference is: discharge lamp driven apparatus is used to drive discharge lamp L3n (n=1,2,3, ..., n), it comprises resonant circuit 33n (n=1,2,3 ..., n).Wherein, resonant circuit 33n (n=1,2,3 ..., n) link to each other with transformation resonance circuit 32 respectively, and transformation resonance circuit 32, resonant circuit 33n (n=1,2,3 ..., n) identical with the internal structure of transformation resonance circuit 22, resonant circuit 23 among Fig. 2, and transformation resonance circuit 22 is all identical with the annexation of resonant circuit 23 among its two annexation and Fig. 2, therefore, does not repeat them here.In the present embodiment, resonant circuit 33n (n=1,2,3 ..., n) connect respectively corresponding discharge lamp L3n (n=1,2,3 ..., n), with the AC signal behind the resonance export to discharge lamp L3n (n=1,2,3 ..., n).
In the discharge lamp driven apparatus of the present invention, the electric capacity that plays resonance effect in transformation resonance circuit and the resonant circuit all is directly connected between transformer secondary output winding high-pressure side and the low-pressure end, make can not produce stray electrical current between transformation resonance circuit, resonant circuit and the LCD panel housing, and then make the discharge lamp current feedback signal comparatively accurate.
Claims (7)
1. a discharge lamp driven apparatus is used to drive discharge lamp, it is characterized in that, described discharge lamp driven apparatus comprises:
Power-switching circuit, the conversion of signals that is used for receiving is an AC signal;
Transformation resonance circuit links to each other with described power-switching circuit, the described AC signal that is used to boost, and it comprises:
Transformer has elementary winding and secondary winding;
Electric capacity, it is connected between described transformer secondary output winding high-pressure side and the low-pressure end;
The PWM controller is connected in described power-switching circuit, is used to control the size of described power-switching circuit output AC; And
At least one resonant circuit is connected between described transformer secondary output winding high-pressure side and the low-pressure end, is used for the AC signal after boosting is converted to the AC signal that can drive described discharge lamp, and described resonant circuit comprises:
Inductance is connected between described transformer secondary output winding high-pressure side and the described discharge lamp; And
Resonant capacitance is connected between described discharge lamp and the described transformer secondary output winding low-pressure end, and described resonant capacitance is an embedded capacitance.
2. discharge lamp driven apparatus as claimed in claim 1 is characterized in that described resonant circuit comprises another resonant capacitance, and it is connected between described resonant capacitance and the described transformer secondary output winding low-pressure end.
3. discharge lamp driven apparatus as claimed in claim 1, it is characterized in that, also comprise feedback circuit, be connected between described transformation resonance circuit and the described PWM controller, be used for feedback flow through the electric current of described discharge lamp to described PWM controller, it comprises first filter circuit, is used for the noise of the described discharge lamp electric current of filtering.
4. discharge lamp driven apparatus as claimed in claim 3 is characterized in that, described first filter circuit comprises first filter capacitor, is connected between described transformer secondary output winding low-pressure end and the ground.
5. discharge lamp driven apparatus as claimed in claim 3 is characterized in that described feedback circuit comprises second filter circuit, is used for the noise of the described discharge lamp electric current of filtering, and described second filter circuit comprises:
Second filter capacitor, it is connected between described transformer secondary output winding low-pressure end and the ground; And
Resistance, itself and described second filter capacitor are connected in series.
6. discharge lamp driven apparatus as claimed in claim 3 is characterized in that, described feedback circuit comprises:
First diode, its plus earth, negative electrode links to each other with the low-pressure end of described transformer secondary output winding;
Second diode, its anode links to each other with the negative electrode of described first diode, and negative electrode and described PWM controller are electrical connected; And
Sensing resistor, it is connected between the negative electrode of the anode of described first diode and described second diode.
7. discharge lamp driven apparatus as claimed in claim 1 is characterized in that, described resonant circuit links to each other with described discharge lamp, is used to drive described discharge tube lighting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100604064A CN101060740B (en) | 2006-04-21 | 2006-04-21 | Discharge lamp drive device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006100604064A CN101060740B (en) | 2006-04-21 | 2006-04-21 | Discharge lamp drive device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101060740A CN101060740A (en) | 2007-10-24 |
| CN101060740B true CN101060740B (en) | 2011-03-23 |
Family
ID=38866566
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006100604064A Expired - Fee Related CN101060740B (en) | 2006-04-21 | 2006-04-21 | Discharge lamp drive device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101060740B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101762443B1 (en) | 2011-03-24 | 2017-07-27 | 엘지이노텍 주식회사 | A circuit of discharging in input stage of a drive ic |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1606395A (en) * | 2003-10-03 | 2005-04-13 | 夏普株式会社 | Drive system and AC conversion apparatus |
| US7002819B1 (en) * | 2005-03-02 | 2006-02-21 | Lien Chang Electronic Enterprise Co., Ltd. | Half-bridge inverter |
| CN2837883Y (en) * | 2005-11-14 | 2006-11-15 | 尼克森微电子股份有限公司 | Light source drive circuit |
-
2006
- 2006-04-21 CN CN2006100604064A patent/CN101060740B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1606395A (en) * | 2003-10-03 | 2005-04-13 | 夏普株式会社 | Drive system and AC conversion apparatus |
| US7002819B1 (en) * | 2005-03-02 | 2006-02-21 | Lien Chang Electronic Enterprise Co., Ltd. | Half-bridge inverter |
| CN2837883Y (en) * | 2005-11-14 | 2006-11-15 | 尼克森微电子股份有限公司 | Light source drive circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101060740A (en) | 2007-10-24 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110323 Termination date: 20140421 |