CN102347003A - Light source brilliance control apparatus - Google Patents
Light source brilliance control apparatus Download PDFInfo
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- CN102347003A CN102347003A CN2010102465363A CN201010246536A CN102347003A CN 102347003 A CN102347003 A CN 102347003A CN 2010102465363 A CN2010102465363 A CN 2010102465363A CN 201010246536 A CN201010246536 A CN 201010246536A CN 102347003 A CN102347003 A CN 102347003A
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Abstract
The invention provides a light source brilliance control apparatus used for controlling brilliance of two light sources in a normal scope, and protecting the other light source to work normally without damaging when a high voltage end and a low voltage end of one light source is in short circuit. The light source brilliance control apparatus comprises two grounding resistors, two first diodes and a first control circuit. An anode of each first diode is connected with a corresponding light source low voltage end and a corresponding grounding resistor. The first control circuit comprises a first control chip, a first divider resistance, and a grounding second divider resistance. One end of the first divider resistance connects with cathodes of the two first diodes, and the other end of the first divider resistance connects with a first control chip and the second divider resistance. The first divider resistance and the second divider resistance intersect to form a fourth node. The first control chip detects voltage of the fourth node and stores first reference voltage inside. If the voltage of the fourth node is not less than the first reference voltage, the first control chip maintains current of the two light sources to prevent the normally working light source from over-current and damage.
Description
Technical field
The present invention relates to a kind of light-source brightness control device.
Background technology
At present, in the backlight liquid crystal display module a plurality of bulbs of operated by rotary motion as light source, said bulb be generally cathode fluorescent tube (Cold Cathode Fluorescent Lamp, CCFL).The light-source brightness control device is used for brilliance control with said CCFL in certain scope.In the safety standard test; Principle according to single mistake; Only need pick out at random a CCFL; The high-pressure side of this CCFL and low pressure end through the flow through electric current of this CCFL of resistance short circuit (resistance that uses 2k Ω mainly is the resistance of the simulation human body) detecting of a 2k Ω, are seen that this electric current is whether in the scope of safety standard.The conventional lighting sources brightness controlling device all flows back to said a plurality of CCFL to be awarded circuit and is electrically connected with a control chip through a pipe; Said pipe flows back to be awarded circuit and is used to feedback the minimum current of said a plurality of CCFL of flowing through; Because the height of said CCFL; The rated current of the current ratio said CCFL of low pressure end during by short circuit is little a lot; As long as therefore the height of a CCFL is arranged; Pass through the resistance short circuit of a 2k Ω between the low pressure end; Said pipe flows back to be awarded circuit institute current detected and just is the height of said CCFL; When passing through the resistance short circuit of a 2k Ω between the low pressure end, the electric current of the said CCFL that flows through.Said control chip internal memory contains a reference current; Said reference current equals the rated current of said CCFL; If said pipe flows back to and awards the rated current of circuit current detected value less than said CCFL; Said control chip just all increases the electric current among each CCFL; So just make the electric current of those CCFL that are in normal operating conditions can exceed rated current, be damaged easily.
Summary of the invention
In view of this, be necessary to provide a kind of light-source brightness control device, when the high-pressure side of a light source and low pressure end were through a resistance short circuit near the human body resistance therein, protection other light sources operate as normal was not damaged.
A kind of light-source brightness control device is used for brilliance control with at least two light sources in normal range.Said at least two light sources are cathode fluorescent tube, and each light source includes a high-pressure side and a low pressure end.High-pressure side and the low pressure end that said light-source brightness control device also is used for a light source therein is during through a resistance short circuit near the human body resistance, and protection other light sources operate as normal is not damaged.Said light-source brightness control device comprises at least two stake resistances, at least two first diodes and a first control circuit.Said at least two light sources are corresponding one by one with said at least two stake resistances, said at least two first diodes respectively.The anode of each first diode is electrically connected with the low pressure end of corresponding light source and corresponding stake resistance.Said first control circuit comprises one first divider resistance, second divider resistance and one first control chip; One end of said first divider resistance is connected with the cathodic electricity of said two first diodes at least; The other end is electrically connected the other end ground connection of said second divider resistance with said first control chip and said second divider resistance simultaneously.Said first divider resistance and the said second divider resistance intersection form the 4th node.Said first control chip is used to detect the voltage of said the 4th node, and the said first control chip storage inside has one first reference voltage, said first reference voltage when having a light source operate as normal at least, the voltage of said the 4th node.If the voltage of said the 4th node during more than or equal to said first reference voltage, just shows to also have a light source operate as normal at least, said first control chip does not send control signal, prevents that the light source of operate as normal from damaging because of electric current is excessive.
Light-source brightness control device of the present invention; Utilize will the flow through maximum current of said at least two light sources of at least two diodes to feedback to said first control circuit; Make in the safety standard test; Said control chip can not pass through the resistance short circuit near the human body resistance because of the high-pressure side and the low pressure end of one of them light source; And the electric current in said at least two light sources is increased simultaneously, thereby effectively protect the other light sources operate as normal not to be damaged.
Description of drawings
Fig. 1 is the circuit diagram of the light-source brightness control device of better embodiment of the present invention.
The main element symbol description
Light-source brightness control device 100
The 3rd diode 51
The 4th diode 52
The 3rd divider resistance 73
First node N1
Section Point N2
The 3rd node N3
The 4th node N4
The 5th node N5
Embodiment
To combine accompanying drawing below, the present invention will be done further detailed description.
See also Fig. 1; A kind of light-source brightness control device 100 that provides for embodiment of the present invention; Be used for the brightness of a plurality of light sources of a module backlight (figure do not show) is controlled, and when a light source works was unusual therein, protection other light sources operate as normal was not damaged.In this embodiment, be that example describes with the module backlight that comprises two light sources (i.e. first light source 210 and secondary light source 220).
Said light-source brightness control device 100 comprises one first driving circuit 11, one second driving circuit 12, one first stake resistance 31, one second stake resistance 32, one first diode 41, one second diode 42, one the 3rd diode 51, one the 4th diode 52, first control circuit 60, second control circuit 70.
The model of said first light source 210 and secondary light source 220 is identical, all is a kind of fluorescent tubes that need the high voltagehigh frequency electric field to excite, but the brightness of this fluorescent tube but is to rely on the electric current of flowing through wherein to control.This fluorescent tube comprises a high-pressure side and a low pressure end; It has a characteristic: when between the high-pressure side of this fluorescent tube and the low pressure end during through the resistance near the human body resistance (such as the resistance of 2k Ω) short circuit; Most electric current can pass through the resistance of said 2k Ω; But some electric current can flow through said fluorescent tube; The electric current that this moment, lamp tube current will be when being in normal operating conditions (being that fluorescent tube is worked) under rated current is little a lot, therefore the brightness meeting step-down of said fluorescent tube itself.In this embodiment, said first light source 210 and and secondary light source 220 be cathode fluorescent tube (Cold Cathode Fluorescent Lamp, CCFL).Rated current when said first light source 210 and secondary light source 220 operate as normal is I
1, the high-pressure side of said first light source 210 and secondary light source 220 and the low pressure end electric current during all through a resistance short circuit near the human body resistance is I
2I
1Much larger than I
2In this embodiment, said I
1Be 5～9mA, said I
2Be 0.01～0.03mA.
Said first light source 210 comprises first high-pressure side 211 and first low pressure end 212, and said secondary light source 220 comprises second high-pressure side 221 and second low pressure end 222.
Said first driving circuit 11 and said second driving circuit 12 are electrically connected with said first high-pressure side 211 and said second high-pressure side 221 respectively, and it is luminous to be used to drive said first light source 210 and said secondary light source 220.In this embodiment, said first driving circuit 11 is an inverter with said second driving circuit 12, is used for direct current is converted to the alternating current of 40kv～50kv.
One end of said first stake resistance 31 is electrically connected with said first low pressure end 212 respectively, forms first node N1.Said second stake resistance 32 is electrically connected with said second low pressure end 222, forms Section Point N2.The other end of said first stake resistance 31 and second stake resistance 32 is ground connection respectively; The voltage of then said first node N1, Section Point N2 is respectively the voltage at said first stake resistance 31 and second stake resistance, 32 two ends.The resistance R of said first stake resistance 31
1Expression, the resistance R of said second stake resistance 32
2Expression, and R
1=R
2In this embodiment, said R
1And R
2Be 1k Ω.
Said first low pressure end 212 is electrically connected with said first control circuit 60 through one first diode 41.Said second low pressure end 222 is electrically connected with said first control circuit 60 through one second diode 42.And the anode of said first diode 41 and second diode 42 is electrically connected with said first low pressure end 212 and second low pressure end 222 respectively; The negative electrode of said first diode 41 and second diode 42 intersects formation the 3rd node N3, and said then the 3rd node N3 is electrically connected with said first control circuit 60.
Said first control circuit 60 is used for detecting the maximum current of said first light source 210 and secondary light source 220 of flowing through; And convert this maximum current signal to voltage signal; Whether decision carries out current compensation to said first light source 210 and said secondary light source 220 according to this detecting result then, and the brightness of said first light source 210 and secondary light source 220 is all maintained in certain scope.Said first control circuit 60 comprises 61, one second divider resistances 62 of one first divider resistance and one first control chip 63.One end of said first divider resistance 61 is connected with the cathodic electricity of said first diode 41, and the other end is electrically connected with an end of said first control chip 63 and said second divider resistance 62 simultaneously.The other end ground connection of said second divider resistance 62.Said first divider resistance 61 and said second divider resistance 62 intersect formation the 4th node N4.The resistance R of said first divider resistance 61
3Expression, the resistance R of said second divider resistance 62
4Expression.Said first control chip, 63 internal memories contain one first reference voltage U
10It is used to detect the voltage of said the 4th node N4, and with voltage and the said first reference voltage U of said the 4th node N4
10Compare, and send control signal according to comparative result.The said first reference voltage U
10In said first light source 210 and said secondary light source 220; One of them light source operate as normal; Between the high and low pressure end of another light source during through a resistance short circuit near the human body resistance, the magnitude of voltage of the 4th node N4 that said first control chip 63 is detected.
Concrete analysis is as follows: (1) when said first light source, 210 operate as normal, when the high and low pressure end of said secondary light source 220 passes through a resistance short circuit near the human body resistance, and the electric current I of said first light source 210 of flowing through
1Electric current than in the said secondary light source 220 of flowing through is big, and the voltage of the said Section Point N2 of the voltage ratio of then said first node N1 is big.Because said the 3rd node N3 is through said first divider resistance 61 and second divider resistance, 62 ground connection, so in said first divider resistance 61 and second divider resistance 62, do not have electric current through out-of-date, the voltage of said the 3rd node N3 is 0.At this moment; Because the voltage difference at first diode, 41 to the second diodes, 42 two ends is big; Therefore said first diode 41 first conductings; Make the voltage of said the 3rd node N3 be slightly less than the voltage of said first node N1 (because after 41 conductings of said first diode; There is a very little pressure drop; Such as 0.3V), the voltage of then said the 3rd node N3 can cause said second diode 42 to end greater than the voltage of said Section Point N2.At this moment, the electric current that flows into said second divider resistance 62 is the electric current I of said first light source 210 of flowing through
1, therefore the voltage at second divider resistance, 62 two ends (also promptly the voltage of the 4th node N4 is) is U
11=R
4* I
1
(2) as if said first light source 210 and secondary light source 220 equal operate as normal, the electric current of then flow through said first light source 210 and the said secondary light source 220 of flowing through is I
1The voltage of said first node N1 equals the voltage of said Section Point N2; The voltage difference at then said first diode 41 and second diode, 42 two ends equates; Make said first diode 41 and the conductings simultaneously of said second diode 42; The electric current that flow into said second divider resistance 62 this moment is the electric current sum of the electric current and the said secondary light source 220 of flowing through of said first light source 210 of flowing through, the voltage at then said second divider resistance 62 two ends (also promptly the voltage of the 4th node N4 is) U
12=R
4* (I
1+ I
1).Obviously, U
12＞U
11
(3) if between the high and low pressure end of said first light source 210 and secondary light source 220 during all through a resistance short circuit near the human body resistance, the electric current of then flow through said first light source 210 and the said secondary light source 220 of flowing through is I
2The voltage of said first node N1 equals the voltage of said Section Point N2; The voltage difference at then said first diode 41 and second diode, 42 two ends equates; Make said first diode 41 and the conductings simultaneously of said second diode 42; The electric current that flow into said second divider resistance 62 this moment is the electric current sum of the electric current and the said secondary light source 220 of flowing through of said first light source 210 of flowing through, the electric current I but flow through this moment in first light source 210 and the said secondary light source 220
2All very little, much smaller than I
1, the voltage at then said second divider resistance 62 two ends (also promptly the voltage of the 4th node N4 is) U
13=R
4* (I
2+ I
2).Obviously, U
13＜U
11
To sum up can know, if the voltage of said the 4th node N4 is more than or equal to the said first reference voltage U
10Just show to also have a light source operate as normal at least, said first control chip 63 is failure to actuate, and prevents that the light source of operate as normal from damaging because of electric current is excessive; When the voltage of said the 4th node N4 less than the said first reference voltage U
10The high and low pressure end that just shows first light source 210 and secondary light source 220 all through one near the resistance short circuit of human body resistance; Said first control chip 63 just sends control signal; Increase the electric current of said first light source 210 and secondary light source 220, the brightness of said first light source 210 and secondary light source 220 is increased.
Said first low pressure end 212 is electrically connected with said second control circuit 70 through said the 3rd diode 51, and said second low pressure end 222 is electrically connected with said second control circuit 70 through said the 4th diode 52.And the negative electrode of said the 3rd diode 51 and said the 4th diode 52 is electrically connected with said first low pressure end 212 and said second low pressure end 222 respectively; The anode intersection of said the 3rd diode 51 and said the 4th diode 52 forms the 5th node N5, and said the 5th node N5 is electrically connected with said second control circuit 70.
Whether the high-pressure side that said second control circuit 70 is used to detect first light source 210 or said secondary light source 220 breaks off with corresponding driving circuit; If wherein there is the high-pressure side of a light source to break off with corresponding driving circuit; Said second control circuit 70 just sends control signal; Said first driving circuit 11 and said second driving circuit 12 are quit work; Prevent that said first driving circuit 11 and said second driving circuit 12 are when the high-pressure side with said first light source 210 or said secondary light source 220 breaks off; Still constantly carry out effluve, human body is damaged.
Said second control circuit 70 comprises a dc bias source 71, the 3rd divider resistance 73 and one second control chip 75.Said dc bias source 71 is electrically connected with said the 5th node N5 through said the 3rd divider resistance 73.The resistance R of said the 3rd divider resistance 73
5Expression.Said second control chip 75 is electrically connected with said the 5th node N5.Said dc bias source 71 is used to provide a DC voltage V
CC, and the voltage that it provided be lower than the light source of operate as normal and the voltage of the node between its pairing stake resistance (such as if said first light source, 210 operate as normal, then said V
CCVoltage be lower than the voltage of said first node N1), make that said the 3rd diode 51 ends when said first light source, 210 operate as normal; When said secondary light source 220 operate as normal, said the 4th diode 52 ends.Therefore, when the equal operate as normal of said first light source 210 and said secondary light source 220, the voltage of said the 5th node N5 equals the voltage V that said dc bias source 71 is provided
CCSaid second control chip, 75 internal memories contain the second reference voltage U
22, the wherein said second reference voltage U
22Equal the voltage V of said dc bias source 71
CCSaid second control chip 75 also is used to detect the voltage of said the 5th node N5, if the voltage of said the 5th node N5 is less than the said second reference voltage U
22, said second control chip 75 just sends control signal, allows said first driving circuit 11 and said second driving circuit 12 quit work.
Concrete analysis is as follows: when the equal operate as normal of said first light source 210 and said secondary light source 220; Said the 3rd diode 51 and said the 4th diode 52 all end; Do not have electric current in then said the 3rd divider resistance 73, cause the voltage of said the 5th node N5 to equal the voltage V that said dc bias source 71 is provided
CC(the i.e. second reference voltage U
22).When said first light source, 210 operate as normal; When second high-pressure side 221 of said secondary light source 220 and second driving circuit 12 break off; The voltage of said first node N1 is greater than the voltage of said dc bias source 71; The voltage of said Section Point N2 is zero; Then said the 3rd diode 51 ends; 52 conductings of said the 4th diode; This moment, said dc bias source 71 formed a loop with said the 3rd divider resistance 73, said second stake resistance 32, and the voltage of said the 5th node N5 is the voltage that said second stake resistance 32 is got
Obviously less than the said second reference voltage U
22In like manner; When if the high-pressure side of said first light source 210 and secondary light source 220 all breaks off with corresponding driving circuit; The voltage of then said first node N1 and said Section Point N2 is zero; Said the 3rd diode 51 and the 52 equal conductings of said the 4th diode, this moment, the voltage of said the 4th node N4 was the voltage that said first stake resistance 31 and second stake resistance, 32 parallel connection backs are got
(wherein
), U then
52Also less than the said second reference voltage U
22, therefore if the voltage of said the 5th node N5 less than the said second reference voltage U
22, just showing said have at least the high-pressure side of a light source and corresponding driving circuit disconnection, this moment, said second control chip 75 just sent control signal, allowed said first driving circuit 11 and second driving circuit 12 quit work.In this embodiment, the voltage that said dc bias source 71 is provided is 24V.The resistance of said the 3rd divider resistance 73 is 10k Ω.
The course of work of said light-source brightness control device 100 is following:
(1) if in the safety standard test; Make said first light source, 210 operate as normal; Pass through a resistance short circuit between the high and low pressure end of said secondary light source 220 near the human body resistance; 41 conductings of then said first diode; Said second diode 42 ends; Therefore the electric current of said first light source 210 can get into said first control circuit 60; The electric current of secondary light source 220 can not get into said first control circuit 60, makes voltage that said first control chip 63 detected less than the said first reference voltage U
10, said first control chip 63 does not send control signal, can not increase the electric current of said first light source 210 and secondary light source 220, protects said first light source 210.
(2) if in said module backlight (figure does not show) use; The high and low pressure end of said first light source 210 and secondary light source 220 is simultaneously by the human body short circuit; The electric current of flowing through in said first light source 210 and the said secondary light source 220 reduces greatly; The brightness meeting deepening of then said first light source 210 and said secondary light source 220; This moment said first diode 41 and 42 equal conductings of said second diode, said first control circuit 60 according to the voltage of said the 4th node N4 less than the said first reference voltage U
10The detecting result, just can send control signal the electric current in said first light source 210 and the said secondary light source 220 is all improved, make luminance recovery in said first light source 210 and the said secondary light source 220 to normal scope.
(3) as if said first light source, 210 operate as normal, second high-pressure side 221 of said secondary light source 220 and second driving circuit 12 break off, 52 conductings of then said the 4th diode, and the voltage of said the 5th node N5 is less than the said second reference voltage U at this moment
22, therefore said second control chip 75 just sends control signal, and said first driving circuit 11 and said second driving circuit 12 are all quit work.In like manner, if the high-pressure side of first light source 210 and secondary light source 220 all breaks off with corresponding driving circuit, then said the 3rd diode 51 and the 52 equal conductings of said the 4th diode, the voltage of then said the 5th node N5 is still less than the said second reference voltage U
22, therefore said second control chip 75 also can send control signal, and said first driving circuit 11 and said second driving circuit 12 are quit work.To sum up; Break off with corresponding driving circuit as long as just can know the high-pressure side that a light source is arranged, said second control chip 75 all can send control signal, and said first driving circuit 11 and second driving circuit 12 are quit work; Prevent electric leakage, the better protection user's security.
Be appreciated that; In other embodiments; If the quantity of the light source said module backlight in (figure does not show) is during more than 2; Then the circuit connecting relation of other light sources is identical with said first light source 210 and said secondary light source 220; The low pressure end that is each light source all is electrically connected with said first control circuit through one the 5th diode, also is electrically connected with said second control circuit through one the 6th diode simultaneously.Be that the anode of said the 5th diode and the negative electrode of said the 6th diode are electrically connected with said low pressure end, the negative electrode of said the 5th diode is electrically connected with said first control circuit, and the anode of said the 6th diode is electrically connected with said second control circuit.And the low pressure end of all each light sources also is electrically connected with a stake resistance.
Light-source brightness control device of the present invention; Utilize will the flow through maximum current of said first light source and secondary light source of at least two diodes to feedback to first control chip; Make in the safety standard test; Said first control chip not can because of between the high and low pressure end of some light sources wherein through a resistance short circuit near the human body resistance; And the electric current in the light source of operate as normal is all increased, thereby effectively protect the light source that is in normal operating conditions not to be damaged; Whether the high-pressure side that said light source protection circuit of while also can be detected said first light source and secondary light source breaks off with corresponding driving circuit; Make when the high-pressure side that has a light source at least breaks off with corresponding driving circuit; Said second control chip just sends instruction; Make said first driving circuit and second driving circuit quit work, prevent that the user from damaging.
Be understandable that, for the person of ordinary skill of the art, can make other various corresponding changes and distortion by technical conceive according to the present invention, and all these change the protection domain that all should belong to claim of the present invention with distortion.
Claims (7)
1. light-source brightness control device; Be used for brilliance control with at least two light sources in normal range; Said at least two light sources are cathode fluorescent tube; And each light source includes a high-pressure side and a low pressure end; High-pressure side and the low pressure end that said light-source brightness control device also is used for a light source therein be during through a resistance short circuit near the human body resistance, the light source of protection operate as normal; Said light-source brightness control device comprises at least two stake resistances, at least two first diodes and a first control circuit; Said at least two light sources are corresponding one by one with said at least two stake resistances, said at least two first diodes respectively; The anode while of each first diode is electrically connected with corresponding low pressure end and corresponding stake resistance; Said first control circuit comprises one first divider resistance, second divider resistance and one first control chip; One end of said first divider resistance is connected with the cathodic electricity of said two first diodes at least; The other end is electrically connected the other end ground connection of said second divider resistance with said first control chip and said second divider resistance simultaneously; Said first divider resistance and the said second divider resistance intersection form the 4th node; Said first control chip is used to detect the voltage of said the 4th node, and the said first control chip storage inside has one first reference voltage, said first reference voltage when having a power supply operate as normal at least, the voltage of said the 4th node; If the voltage of said the 4th node is during more than or equal to said first reference voltage; Just show and also have a light source operate as normal at least; Said first control chip does not send the control signal of the electric current that increases said at least two light sources, prevents that the light source of operate as normal from damaging because of electric current is excessive.
2. light-source brightness control device as claimed in claim 1; It is characterized in that; If the voltage of said the 4th node is during less than said first reference voltage; Just show between the high and low pressure end of said at least two light sources all by a resistance short circuit near the human body resistance; Said first control circuit just allows the electric current in said at least two light sources all increase, and increases the product for said first reference voltage and said light source number until the voltage of said the 4th node.
3. light-source brightness control device as claimed in claim 1; It is characterized in that; Said light-source brightness control device also comprises at least two first driving circuits; Each light source includes a high-pressure side; Each driving circuit is electrically connected with the high-pressure side of corresponding light source, is used to drive a corresponding light source luminescent.
4. light-source brightness control device as claimed in claim 1; It is characterized in that; Said light-source brightness control device also comprises a second control circuit, at least two the 3rd diodes; The negative electrode of said at least two the 3rd diodes is electrically connected with corresponding low pressure end respectively; The anode intersection of said at least two the 3rd diodes; Form the 5th node, said the 5th node is electrically connected with said second control circuit; Said second control circuit is used to detect the voltage of said the 5th node; And said second control circuit internal memory contains one second reference voltage; When the voltage of said the 5th node during less than said second reference voltage; Said second control chip just sends control signal, and said at least two driving circuits are quit work.
5. light-source brightness control device as claimed in claim 4; It is characterized in that; Said second control circuit comprises a dc bias source, the 3rd divider resistance and one second control chip, and said dc bias source is electrically connected with the negative electrode and said second control chip of the negative electrode of said the 3rd diode, said the 4th diode through said the 3rd divider resistance simultaneously.
6. light-source brightness control device as claimed in claim 5 is characterized in that, said second reference voltage is the voltage of said dc bias source.
7. light-source brightness control device as claimed in claim 5 is characterized in that the voltage that said dc bias source provided is lower than the voltage at the stake resistance two ends that light source connected of operate as normal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010246536.3A CN102347003B (en) | 2010-08-05 | 2010-08-05 | Light source brilliance control apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010246536.3A CN102347003B (en) | 2010-08-05 | 2010-08-05 | Light source brilliance control apparatus |
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| CN102347003B CN102347003B (en) | 2014-08-20 |
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