CN201388328Y - Transformer drive circuit and liquid crystal display device thereof - Google Patents
Transformer drive circuit and liquid crystal display device thereof Download PDFInfo
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- CN201388328Y CN201388328Y CN200920153815U CN200920153815U CN201388328Y CN 201388328 Y CN201388328 Y CN 201388328Y CN 200920153815 U CN200920153815 U CN 200920153815U CN 200920153815 U CN200920153815 U CN 200920153815U CN 201388328 Y CN201388328 Y CN 201388328Y
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Abstract
The utility model embodiment discloses a transformer drive circuit and a liquid crystal display device thereof. The transformer drive circuit comprises four lighting tubes and an inverter transformer with one primary winding and two secondary windings; the four lighting tubes are divided into two groups, and separately connected in series to the two ends of the two secondary windings of the inverter transformer; and the tandem position of the lighting tubes is connected to the ground, and a sampling resistor is connected between the lighting tubes and the ground. The utility model suits the four CCFL lighting tubes driven by the liquid crystal display device by adopting the inverter transformer.
Description
Technical field
The utility model relates to the drive circuit technical field, relates in particular to a kind of transformer drive circuit and has the liquid crystal indicator of this circuit.
Background technology
Liquid crystal indicator has been widely used in association areas such as mobile phone, personal digital assistant, notebook computer, PC and TV with its low diathermaneity, characteristics such as volume is little, in light weight and power consumption is low.Because liquid crystal itself does not possess the characteristics of luminescence, so need external power source to show required light for liquid crystal indicator provides.At present, CCFL (Cold Cathode Fluorescent Lamp, cold-cathode fluorescence lamp) is commonly used for the external light source of liquid crystal indicator, and CCFL generally need provide required operating voltage for it by inverter circuit.
Usually, have four CCFL fluorescent tubes in the LCD TV, the inverter circuit that adopts two contravariant transformers to form drives described four CCFL fluorescent tubes, and each contravariant transformer drives two CCFL fluorescent tubes, for described four CCFL fluorescent tubes provide its required operating voltage.
In realizing process of the present utility model, the inventor finds that there are the following problems at least in the prior art:
Adopt two contravariant transformers that four CCFL fluorescent tubes are driven, when short circuit appears in a CCFL fluorescent tube that contravariant transformer drove, may cause damage, the difficult realization of short-circuit protection the fluorescent tube that another contravariant transformer drove; In addition, adopt two contravariant transformers, improved production cost.
The utility model content
Embodiment of the present utility model provides a kind of transformer drive circuit and has the liquid crystal indicator of this circuit; can use a contravariant transformer to drive four CCFL fluorescent tubes simultaneously; reduce production cost, can realize the short-circuit protection of CCFL fluorescent tube simultaneously easily.
The technical scheme that the utility model embodiment adopts is:
A kind of transformer drive circuit comprises: four fluorescent tubes and have the contravariant transformer of an elementary winding and two secondary winding; Described four fluorescent tubes are divided into two groups, and series connection is connected on the two ends of two secondary winding of described contravariant transformer respectively; The series connection place ground connection of described fluorescent tube is connected with sampling resistor between fluorescent tube and the ground.
Wherein, two inputs of the elementary winding of described contravariant transformer comprise two terminals that are in parallel respectively.
Wherein, described contravariant transformer input is connected with first metal-oxide-semiconductor by two terminals that are in parallel;
Another input of described contravariant transformer is connected with second metal-oxide-semiconductor by two terminals that are in parallel, and wherein, is connected with three capacitances that are in parallel between described two terminals that are in parallel and second metal-oxide-semiconductor.
Wherein, one end of described contravariant transformer first secondary winding is connected with the high-pressure side of first fluorescent tube, the other end of described contravariant transformer first secondary winding is connected with the high-pressure side of second fluorescent tube, is parallel with electric capacity between an end of described contravariant transformer first secondary winding and the other end;
One end of described contravariant transformer second subprime winding is connected with the high-pressure side of the 3rd fluorescent tube, the other end of described contravariant transformer second subprime winding is connected with the high-pressure side of the 4th fluorescent tube, is parallel with electric capacity between an end of described contravariant transformer second subprime winding and the other end.
Wherein, the low-pressure end of described first fluorescent tube is connected with an end of first resistance, and the other end of described first resistance is connected with the positive pole of first diode, and the negative pole of described first diode is connected with an end of second resistance and first electric capacity;
The low-pressure end of described second fluorescent tube is connected with an end of the 3rd resistance, and the other end of described the 3rd resistance is connected with the positive pole of second diode, and the negative pole of described second diode is connected with an end of the 4th resistance and second electric capacity;
The equal ground connection of the other end of the other end of described second resistance and first electric capacity and described the 4th resistance and second electric capacity.
Wherein, the low-pressure end of described the 3rd fluorescent tube is connected with an end of the 5th resistance, and the other end of described the 5th resistance is connected with the positive pole of the 3rd diode, and the negative pole of described the 3rd diode is connected with an end of the 6th resistance and the 3rd electric capacity;
The low-pressure end of described the 4th fluorescent tube is connected with an end of the 7th resistance, and the other end of described the 7th resistance is connected with the positive pole of the 4th diode, and the negative pole of described the 4th diode is connected with an end of the eight or four resistance and the 4th electric capacity;
The equal ground connection of the other end of the other end of described the 6th resistance and the 3rd electric capacity and described the 8th resistance and the 4th electric capacity.
Wherein, the positive pole of described first diode is connected with the negative pole of the 7th diode, and the positive pole of described second diode is connected with the negative pole of the 8th diode, anodal all ground connection of the positive pole of described the 7th diode and described the 8th diode;
The positive pole of described the 3rd diode is connected with the negative pole of the 9th diode, and the positive pole of described the 4th diode is connected with the negative pole of the tenth diode, anodal all ground connection of the positive pole of described the 9th diode and described the tenth diode.
Wherein, the positive pole of described first diode is connected with the positive pole of the 5th diode, and the positive pole of described second diode is connected with the positive pole of the 5th diode;
The positive pole of described the 3rd diode is connected with the positive pole of the 6th diode, and the positive pole of described the 4th diode is connected with the positive pole of the 6th diode;
The positive pole of described the 5th diode all is connected with the protection chip with the anodal of described the 6th diode.
Wherein, described first diode, second diode, the 3rd diode, the anodal of the 4th diode all are connected with the protection chip.
A kind of liquid crystal indicator with this transformer drive circuit, described liquid crystal indicator has above-described transformer drive circuit, wherein, described transformer drive circuit comprises: four fluorescent tubes and have the contravariant transformer of an elementary winding and two secondary winding; Described four fluorescent tubes are divided into two groups, and series connection is connected on the two ends of two secondary winding of described contravariant transformer respectively; The series connection place ground connection of described fluorescent tube is connected with sampling resistor between fluorescent tube and the ground.
Wherein, two inputs of the elementary winding of described contravariant transformer comprise two terminals that are in parallel respectively.
Wherein, described contravariant transformer input is connected with first metal-oxide-semiconductor by two terminals that are in parallel;
Another input of described contravariant transformer is connected with second metal-oxide-semiconductor by two terminals that are in parallel, and wherein, is connected with three capacitances that are in parallel between described two terminals that are in parallel and second metal-oxide-semiconductor.
Wherein, one end of described contravariant transformer first secondary winding is connected with the high-pressure side of first fluorescent tube, the other end of described contravariant transformer first secondary winding is connected with the high-pressure side of second fluorescent tube, is parallel with electric capacity between an end of described contravariant transformer first secondary winding and the other end;
One end of described contravariant transformer second subprime winding is connected with the high-pressure side of the 3rd fluorescent tube, the other end of described contravariant transformer second subprime winding is connected with the high-pressure side of the 4th fluorescent tube, is parallel with electric capacity between an end of described contravariant transformer second subprime winding and the other end.
Wherein, the low-pressure end of described first fluorescent tube is connected with an end of first resistance, and the other end of described first resistance is connected with the positive pole of first diode, and the negative pole of described first diode is connected with an end of second resistance and first electric capacity;
The low-pressure end of described second fluorescent tube is connected with an end of the 3rd resistance, and the other end of described the 3rd resistance is connected with the positive pole of second diode, and the negative pole of described second diode is connected with an end of the 4th resistance and second electric capacity;
The equal ground connection of the other end of the other end of described second resistance and first electric capacity and described the 4th resistance and second electric capacity.
Wherein, the low-pressure end of described the 3rd fluorescent tube is connected with an end of the 5th resistance, and the other end of described the 5th resistance is connected with the positive pole of the 3rd diode, and the negative pole of described the 3rd diode is connected with an end of the 6th resistance and the 3rd electric capacity;
The low-pressure end of described the 4th fluorescent tube is connected with an end of the 7th resistance, and the other end of described the 7th resistance is connected with the positive pole of the 4th diode, and the negative pole of described the 4th diode is connected with an end of the eight or four resistance and the 4th electric capacity;
The equal ground connection of the other end of the other end of described the 6th resistance and the 3rd electric capacity and described the 8th resistance and the 4th electric capacity.
Wherein, the positive pole of described first diode is connected with the negative pole of the 7th diode, and the positive pole of described second diode is connected with the negative pole of the 8th diode, anodal all ground connection of the positive pole of described the 7th diode and described the 8th diode;
The positive pole of described the 3rd diode is connected with the negative pole of the 9th diode, and the positive pole of described the 4th diode is connected with the negative pole of the tenth diode, anodal all ground connection of the positive pole of described the 9th diode and described the tenth diode.
Wherein, the positive pole of described first diode is connected with the positive pole of the 5th diode, and the positive pole of described second diode is connected with the positive pole of the 5th diode;
The positive pole of described the 3rd diode is connected with the positive pole of the 6th diode, and the positive pole of described the 4th diode is connected with the positive pole of the 6th diode;
The positive pole of described the 5th diode all is connected with the protection chip with the anodal of described the 6th diode.
Wherein, described first diode, second diode, the 3rd diode, the anodal of the 4th diode all are connected with the protection chip.
The utility model embodiment transformer drive circuit and have the liquid crystal indicator of this circuit, employing has the contravariant transformer of novel skeleton, reduced the contravariant transformer quantity on the INVERTER drive plate, reduced INVERTER drive plate cost, simplify the design of INVERTER drive plate PCB, thereby reduced production cost; Utilize the electromagnetic induction of the output winding of two couplings of same contravariant transformer, can realize the short-circuit protection of any CCFL fluorescent tube in the liquid crystal indicator easily.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
The transformer drive circuit schematic diagram that Fig. 1 provides for the utility model embodiment;
Contravariant transformer structural representation in the transformer drive circuit that Fig. 2 provides for the utility model embodiment;
Contravariant transformer drives the principle schematic of CCFL fluorescent tube in the transformer drive circuit that Fig. 3 provides for the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme among the utility model embodiment is clearly and completely described, obviously, described embodiment only is the utility model part embodiment, rather than whole embodiment.Based on the embodiment in the utility model, those of ordinary skills are not making all other embodiment that obtained under the creative work prerequisite, all belong to the scope of the utility model protection.
For the advantage that makes technical solutions of the utility model is clearer, the utility model is elaborated below in conjunction with drawings and Examples.
Embodiment of the present utility model provides a kind of transformer drive circuit, can use a contravariant transformer to drive four CCFL fluorescent tubes simultaneously, has reduced production cost, can realize the short-circuit protection of CCFL fluorescent tube simultaneously easily.
As shown in Figure 1, described transformer drive circuit comprises: four CCFL fluorescent tube N1, N2, N3, N4 and have the contravariant transformer T of an elementary winding and two secondary winding; Described four fluorescent tubes are divided into two groups, and series connection is connected on the two ends of two secondary winding of described contravariant transformer respectively; The series connection place ground connection of described fluorescent tube is connected with sampling resistor between fluorescent tube and the ground.
As shown in Figure 1 and Figure 2, two inputs of the elementary winding of described contravariant transformer T comprise two terminals that are in parallel respectively.Wherein, described contravariant transformer T input is connected with the first metal-oxide-semiconductor N5 by two terminals that are in parallel 1,2;
Another input of described contravariant transformer T is connected with the second metal-oxide-semiconductor N6 by two terminals that are in parallel 3,4, wherein, be connected with three capacitance C7, C8, C9 that are in parallel between described two terminals that are in parallel 3,4 and the second metal-oxide-semiconductor N6, be used for pressing every removing DC, the driving voltage of two secondary winding that prevents contravariant transformer T is asymmetric and damage metal-oxide-semiconductor.
Wherein, the end 5 of the first secondary winding 5-6 of described contravariant transformer T and the end 7 of second subprime winding 7-8, and an end 1,2 end of the same name each other of elementary winding.
As shown in Figure 3, by described metal-oxide-semiconductor, the square-wave generator of topological structure such as adopt full-bridge, half-bridge, recommend will convert the square-wave voltage of EDM Generator of Adjustable Duty Ratio from the direct current of external circuit to, the resonant network elimination higher harmonic current that utilizes the parasitic capacitance of the leakage inductance of contravariant transformer and CCFL fluorescent tube to form again, square-wave voltage is applied to resonant network, basically have only the sinusoidal current resonant network of flowing through, thereby obtain purer sinusoidal current, drive the CCFL fluorescent tube.
Wherein, the end 6 of the described contravariant transformer T first secondary winding 5-6 is connected with the high-pressure side 1 of the first fluorescent tube N1, the other end 5 of the described contravariant transformer T first secondary winding 5-6 is connected with the high-pressure side 1 of the second fluorescent tube N2, is parallel with capacitor C 5 between the end 6 of the described contravariant transformer T first secondary winding 5-6 and the other end 5.The acting in conjunction of leakage inductance and described capacitor C 5 by described contravariant transformer T when lamp tube starting, improves the gain of resonant network, and the output voltage of the described first secondary winding 5-6 is raise, for fluorescent tube N1 and N2 provide operating voltage.
Equally, the end 8 of described contravariant transformer T second subprime winding 7-8 is connected with the high-pressure side 1 of the 3rd fluorescent tube N3, the other end 7 of described contravariant transformer T second subprime winding 7-8 is connected with the high-pressure side 1 of the 4th fluorescent tube N4, is parallel with capacitor C 6 between the end 8 of described contravariant transformer T second subprime winding 7-8 and the other end 7.The acting in conjunction of leakage inductance and described capacitor C 6 by described contravariant transformer T when lamp tube starting, improves the gain of resonant network, and the output voltage of described second subprime winding 7-8 is raise, for fluorescent tube N3 and N4 provide operating voltage.
Wherein, the low-pressure end 2 of the described first fluorescent tube N1 is connected with an end of first resistance R 1, and the other end of described first resistance R 1 is connected with the positive pole of the first diode D1, and the negative pole of the described first diode D1 is connected with the end of second resistance R 2 with first capacitor C 1; Wherein, described second resistance R 2 is a sampling resistor, can detect the lamp tube current size when lamp works, carries out the short-circuit protection of fluorescent tube.
The low-pressure end 2 of the described second fluorescent tube N2 is connected with an end of the 3rd resistance R 3, and the other end of described the 3rd resistance R 3 is connected with the positive pole of the second diode D2, and the negative pole of the described second diode D2 is connected with the end of the 4th resistance R 4 with second capacitor C 2; Wherein, described the 4th resistance R 4 is a sampling resistor, can detect the lamp tube current size when lamp works, carries out the short-circuit protection of fluorescent tube.
The equal ground connection of the other end of the other end of described second resistance R 2 and first capacitor C 1 and described the 4th resistance R 4 and second capacitor C 2.
Wherein, the low-pressure end 2 of described the 3rd fluorescent tube N3 is connected with an end of the 5th resistance R 5, and the other end of described the 5th resistance R 5 is connected with the positive pole of the 3rd diode D3, and the negative pole of described the 3rd diode D3 is connected with the end of the 6th resistance R 6 with the 3rd capacitor C 3; Wherein, described the 6th resistance R 6 is a sampling resistor, can detect the lamp tube current size when lamp works, carries out the short-circuit protection of fluorescent tube.
The low-pressure end 2 of described the 4th fluorescent tube is connected with an end of the 7th resistance R 7, and the other end of described the 7th resistance R 7 is connected with the positive pole of the 4th diode D4, and the negative pole of described the 4th diode D4 is connected with the end of the 8th resistance R 8 with the 4th capacitor C 4; Wherein, described the 8th resistance R 8 is a sampling resistor, can detect the lamp tube current size when lamp works, carries out the short-circuit protection of fluorescent tube.
The equal ground connection of the other end of the other end of described the 6th resistance R 6 and the 3rd capacitor C 3 and described the 8th resistance R 8 and the 4th capacitor C 4.
Wherein, the positive pole of the described first diode D1 is connected with the negative pole of the 7th diode D7, and the positive pole of the described second diode D2 is connected with the negative pole of the 8th diode D8, anodal all ground connection of the positive pole of described the 7th diode D7 and described the 8th diode D8;
The positive pole of described the 3rd diode D3 is connected with the negative pole of the 9th diode D9, and the positive pole of described the 4th D4 diode is connected with the negative pole of the tenth diode D10, anodal all ground connection of the positive pole of described the 9th diode D9 and described the tenth diode D10.
Wherein, the positive pole of the described first diode D1 is connected with the positive pole of the 5th diode D5, and the positive pole of the described second diode D2 is connected with the positive pole of the 5th diode D5;
The positive pole of described the 3rd diode D3 is connected with the positive pole of the 6th diode D6, and the positive pole of described the 4th diode D4 is connected with the positive pole of the 6th diode D6;
The positive pole of described the 5th diode D5 all is connected with the protection chip with the anodal of described the 6th diode D6, gives the protection chip with Voltage Feedback, and voltage is controlled.
Wherein, the anodal of the described first diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4 all is connected trigger protection chip when low level with the protection chip.
The operation principle of described fluorescent tube is as follows:
For fluorescent tube N1 and N2, when the end 6 of the described first secondary winding 5-6 is high-pressure side, after low-pressure end 2 outflows of electric current by fluorescent tube N1, successively through first resistance R 1, the first diode D1, sampling resistor R2 and first capacitor C 1, then through the 8th diode D8, the 3rd resistance R 3, arrive the low-pressure end 2 of fluorescent tube N2 at last, realize driven two fluorescent tubes;
When the other end 5 of the described first secondary winding 5-6 is high-pressure side, after low-pressure end 2 outflows of electric current by fluorescent tube N2, successively through the 3rd resistance R 3, the second diode D2, sampling resistor R4 and second capacitor C 2, then through the 7th diode D7, first resistance R 1, arrive the low-pressure end 2 of fluorescent tube N1 at last, realize driven two fluorescent tubes.
In like manner, for fluorescent tube N3 and N4, when the end 8 of described second subprime winding 7-8 is high-pressure side, after low-pressure end 2 outflows of electric current by fluorescent tube N3, successively through the 5th resistance R 5, the 3rd diode D3, sampling resistor R6 and the 3rd capacitor C 3, through the tenth diode D10, the 7th resistance R 7, arrive the low-pressure end 2 of fluorescent tube N4 at last then, realize driven two fluorescent tubes;
When the other end 7 of described second subprime winding 7-8 is high-pressure side, after low-pressure end 2 outflows of electric current by fluorescent tube N4, successively through the 7th resistance R 7, the 4th diode D4, sampling resistor R8 and the 4th capacitor C 4, then through the 9th diode D9, the 5th resistance R 5, arrive the low-pressure end 2 of fluorescent tube N3 at last, realize driven fluorescent tube.
Principle to the fluorescent tube short-circuit protection is as follows:
For example, when fluorescent tube N1 short circuit, the voltage at the first secondary winding 5-6 two ends of described contravariant transformer T reduces, thereby the voltage at the second subprime winding 7-8 two ends of described contravariant transformer T is reduced, at this moment, fluorescent tube N3 and N4 extinguish, and can not cause damage to fluorescent tube.
The transformer drive circuit that the utility model embodiment provides and have the liquid crystal indicator of this circuit, employing has the contravariant transformer of novel skeleton, reduced the contravariant transformer quantity on the INVERTER drive plate, reduced INVERTER drive plate cost, simplify the design of INVERTER drive plate PCB, thereby reduced production cost; Utilize the electromagnetic induction of the output winding of two couplings of same contravariant transformer, can realize the short-circuit protection of any CCFL fluorescent tube in the liquid crystal indicator easily.
The utility model is applicable to and adopts the liquid crystal indicator of four CCFL fluorescent tubes as backlight, but is not limited only to this.
The above; it only is embodiment of the present utility model; but protection range of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed within the protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range of claim.
Claims (10)
1, a kind of transformer drive circuit is characterized in that, comprising: four fluorescent tubes and have the contravariant transformer of an elementary winding and two secondary winding; Described four fluorescent tubes are divided into two groups, and series connection is connected on the two ends of two secondary winding of described contravariant transformer respectively; The series connection place ground connection of described fluorescent tube is connected with sampling resistor between fluorescent tube and the ground.
2, transformer drive circuit according to claim 1 is characterized in that, two inputs of the elementary winding of described contravariant transformer comprise two terminals that are in parallel respectively.
3, transformer drive circuit according to claim 2 is characterized in that, an input of described contravariant transformer is connected with first metal-oxide-semiconductor by two terminals that are in parallel;
Another input of described contravariant transformer is connected with second metal-oxide-semiconductor by two terminals that are in parallel, and wherein, is connected with three capacitances that are in parallel between described two terminals that are in parallel and second metal-oxide-semiconductor.
4, transformer drive circuit according to claim 1, it is characterized in that, one end of described contravariant transformer first secondary winding is connected with the high-pressure side of first fluorescent tube, the other end of described contravariant transformer first secondary winding is connected with the high-pressure side of second fluorescent tube, is parallel with electric capacity between an end of described contravariant transformer first secondary winding and the other end;
One end of described contravariant transformer second subprime winding is connected with the high-pressure side of the 3rd fluorescent tube, the other end of described contravariant transformer second subprime winding is connected with the high-pressure side of the 4th fluorescent tube, is parallel with electric capacity between an end of described contravariant transformer second subprime winding and the other end.
5, transformer drive circuit according to claim 1, it is characterized in that, the low-pressure end of described first fluorescent tube is connected with an end of first resistance, the other end of described first resistance is connected with the positive pole of first diode, and the negative pole of described first diode is connected with an end of second resistance and first electric capacity;
The low-pressure end of described second fluorescent tube is connected with an end of the 3rd resistance, and the other end of described the 3rd resistance is connected with the positive pole of second diode, and the negative pole of described second diode is connected with an end of the 4th resistance and second electric capacity;
The equal ground connection of the other end of the other end of described second resistance and first electric capacity and described the 4th resistance and second electric capacity.
6, transformer drive circuit according to claim 1, it is characterized in that, the low-pressure end of described the 3rd fluorescent tube is connected with an end of the 5th resistance, the other end of described the 5th resistance is connected with the positive pole of the 3rd diode, and the negative pole of described the 3rd diode is connected with an end of the 6th resistance and the 3rd electric capacity;
The low-pressure end of described the 4th fluorescent tube is connected with an end of the 7th resistance, and the other end of described the 7th resistance is connected with the positive pole of the 4th diode, and the negative pole of described the 4th diode is connected with an end of the eight or four resistance and the 4th electric capacity;
The equal ground connection of the other end of the other end of described the 6th resistance and the 3rd electric capacity and described the 8th resistance and the 4th electric capacity.
7, transformer drive circuit according to claim 1, it is characterized in that, the positive pole of described first diode is connected with the negative pole of the 7th diode, the positive pole of described second diode is connected with the negative pole of the 8th diode, anodal all ground connection of the positive pole of described the 7th diode and described the 8th diode;
The positive pole of described the 3rd diode is connected with the negative pole of the 9th diode, and the positive pole of described the 4th diode is connected with the negative pole of the tenth diode, anodal all ground connection of the positive pole of described the 9th diode and described the tenth diode.
8, transformer drive circuit according to claim 1 is characterized in that, the positive pole of described first diode is connected with the positive pole of the 5th diode, and the positive pole of described second diode is connected with the positive pole of the 5th diode;
The positive pole of described the 3rd diode is connected with the positive pole of the 6th diode, and the positive pole of described the 4th diode is connected with the positive pole of the 6th diode;
The positive pole of described the 5th diode all is connected with the protection chip with the anodal of described the 6th diode.
9, transformer drive circuit according to claim 8 is characterized in that, described first diode, second diode, the 3rd diode, the anodal of the 4th diode all are connected with the protection chip.
10, a kind of liquid crystal indicator with this transformer drive circuit is characterized in that, described liquid crystal indicator has each described transformer drive circuit in the claim 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920153815U CN201388328Y (en) | 2009-05-06 | 2009-05-06 | Transformer drive circuit and liquid crystal display device thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920153815U CN201388328Y (en) | 2009-05-06 | 2009-05-06 | Transformer drive circuit and liquid crystal display device thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201388328Y true CN201388328Y (en) | 2010-01-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200920153815U Expired - Fee Related CN201388328Y (en) | 2009-05-06 | 2009-05-06 | Transformer drive circuit and liquid crystal display device thereof |
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| CN (1) | CN201388328Y (en) |
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2009
- 2009-05-06 CN CN200920153815U patent/CN201388328Y/en not_active Expired - Fee Related
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Granted publication date: 20100120 Termination date: 20120506 |