CN204331213U - A kind of testing circuit of liquid crystal display module - Google Patents
A kind of testing circuit of liquid crystal display module Download PDFInfo
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- CN204331213U CN204331213U CN201420796197.XU CN201420796197U CN204331213U CN 204331213 U CN204331213 U CN 204331213U CN 201420796197 U CN201420796197 U CN 201420796197U CN 204331213 U CN204331213 U CN 204331213U
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Abstract
The utility model provides a kind of testing circuit of liquid crystal display module, comprise the Voltage Feedback testing circuit be connected on N810 chip, soft start protection circuit, current detection circuit and zero cross detection circuit, described Voltage Feedback testing circuit is connected with resistance R826, R827, R828, R805, R829 and R830, described soft start protection circuit is connected with electric capacity C1, triode V804 and resistance R1028, R1032, R1026, R1030, R1031, described electric capacity C1 ground connection, described current detection circuit is connected with resistance R849 and R825, described zero cross detection circuit is connected with energy storage inductor L1, resistance R816 and R868.The instantaneous pressure that the utility model is formed when can detect startup; electric capacity is charged; voltage is made slowly to increase; form delay protection effect, work as brownout, energy automatic cut-off power voltage when power source loads is overweight; N810 chip is quit work; prevent liquid crystal display from burning, zero cross signal also can be provided to protect liquid crystal display simultaneously, extend its serviceable life.
Description
Technical field
The utility model relates to liquid crystal display module field, relates in particular to a kind of testing circuit of liquid crystal display module.
Background technology
For liquid crystal display, due to the physical characteristics of liquid crystal panel, the temperature variation of environment temperature and display panels itself, the length of working time can have influence on the photoelectric characteristic of liquid crystal display, the rising of environment temperature, working time is long, the factors such as radiating effect is bad all can cause liquid crystal display actuator temperature to rise, cause working current, the change of voltage etc., in addition, general liquid crystal display all can be connected with line voltage and uses or charge, but line voltage is not be stabilized in a numerical value always, can because load number and change, low or high, sometimes even there will be jumping characteristic change, this injury for liquid crystal display is very large, serious is even directly burnt, therefore this just needs to arrange in a liquid crystal display testing circuit and comes to form protective effect to liquid crystal display.
Utility model content
The purpose of this utility model is, for the problems referred to above, provides a kind of testing circuit of the liquid crystal display module that can effectively prevent liquid crystal display from burning.
For achieving the above object, the utility model adopts following technical scheme:
A kind of testing circuit of liquid crystal display module, comprise pfc circuit, described pfc circuit is provided with N810 chip, the first pin of described N810 chip is connected to Voltage Feedback testing circuit, the second pin is connected to soft start protection circuit, 3rd pin is waveform sampling end, 4th pin is connected to current detection circuit, the 5th pin is connected with zero cross detection circuit, the 6th pin ground connection, 7th pin output drive pulse, the 8th pin is connected with feed circuit;
Described Voltage Feedback testing circuit is connected with resistance R826, R827, R828, R805, R829 and R830;
Described soft start protection circuit is connected with electric capacity C1, triode V804 and resistance R1028, R1032, R1026, R1030, R1031, described electric capacity C1 ground connection;
Described current detection circuit is connected with resistance R849 and R825;
Described zero cross detection circuit is connected with energy storage inductor L1, resistance R816 and R868.
Further, resistance R811, R812, R813 and R814 is connected with above the 3rd pin of described N810 chip.
Further, the positive half cycle of described driving pulse is connected with resistance R895, diode VD816, metal-oxide-semiconductor V810, resistance R820, diode VD815 and metal-oxide-semiconductor V811, and the negative half period of described driving pulse is connected with resistance R836, triode V805 and resistance R821, triode V806.
Further, described metal-oxide-semiconductor V810 is connected with voltage stabilizing diode VZ814, described metal-oxide-semiconductor V811 is connected with voltage stabilizing diode VZ811, described triode V805 is also connected with resistance R902, and described triode V806 is connected with resistance R1034.
Further, described feed circuit are provided with commutator tube VZ812, electric capacity C814 and electric capacity C816.
Further, the model of described N810 chip is NCP33262.
Implement the utility model and there is following beneficial effect: by arranging soft start protection circuit, the instantaneous pressure that detection LCD monitor is formed when starting, to capacitor charging, voltage is made slowly to increase, form delay protection effect, and can automatic cut-off power voltage when brownout being detected, prevent liquid crystal display from burning;
When power source loads is extremely overweight, cause the pressure drop of resistance in current detection circuit to raise because electric current is excessive, now N810 chip quits work, and plays a protective role to liquid crystal display;
The voltage that energy storage inductor L1 in zero cross detection circuit responds to for N810 chip provides zero passage detection signal, controls unlatching and the shutoff of the inner chopping signal of pfc circuit after resistance R816 and R868 dividing potential drop.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model;
Fig. 2 is the utility model Voltage Feedback testing circuit figure;
Fig. 3 is the utility model soft start protection circuit figure.
Embodiment
Embodiment of the present utility model is described in detail below in conjunction with accompanying drawing.
A kind of testing circuit of liquid crystal display module, comprise pfc circuit as shown in Figure 1, pfc circuit is provided with N810 chip, the model of N810 chip is NCP33262, first pin of N810 chip is connected to Voltage Feedback testing circuit, as shown in Figure 2, Voltage Feedback testing circuit is connected with resistance R826, R827, R828, R805, R829 and R830; Second pin of N810 chip is connected to soft start protection circuit, as shown in Figure 3, soft start protection circuit is connected with electric capacity C1, triode V804 and resistance R1028, R1032, R1026, R1030, R1031, wherein electric capacity C1 ground connection; 3rd pin of N810 chip is waveform sampling end, is connected with resistance R811, R812, R813 and R814 above; 4th pin of N810 chip is connected to current detection circuit, current detection circuit is connected with resistance R849 and R825; 5th pin of N810 chip is connected with zero cross detection circuit, zero cross detection circuit is connected with energy storage inductor L1, resistance R816 and R868; 6th pin ground connection of N810 chip; 7th pin output drive pulse of N810 chip, the positive half cycle of driving pulse is connected with resistance R895, diode VD816, metal-oxide-semiconductor V810, resistance R820, diode VD815 and metal-oxide-semiconductor V811, and the negative half period of driving pulse is connected with resistance R836, triode V805 and resistance R821, triode V806, wherein metal-oxide-semiconductor V810 is also connected with voltage stabilizing diode VZ814, metal-oxide-semiconductor V811 is connected with voltage stabilizing diode VZ811, triode V805 is also connected with resistance R902, and triode V806 is connected with resistance R1034; 8th pin of N810 chip is connected with feed circuit, and feed circuit are provided with commutator tube VZ812, electric capacity C814 and electric capacity C816.
Concrete, after main frame sends starting-up signal, VCC is through resistance R815 current limliting, commutator tube VZ812 voltage stabilizing, be added to the 8th pin pin of N810 chip after electric capacity C814 and C816 filtering clutter, then through the internal circuit of N810 chip to soft start pin, namely the external capacitor C1 of the second pin charges, after level raises, pfc circuit enters duty, by the 380V voltage of the 300V voltage transformation after rectification needed for work.The positive half cycle of driving pulse is added to the G pole of metal-oxide-semiconductor V810 through resistance R895 and diode VD816, the G pole of metal-oxide-semiconductor V811 is added to through resistance R820 and diode VD815, the negative half period of driving pulse is added to the B pole of triode V805 through resistance R836, the B pole of triode V806 is added to through resistance R821, by triode V805 and V806 conducting, the G pole tension of metal-oxide-semiconductor V810 and V811 discharges fast, voltage stabilizing diode VZ814 and VZ811 is respectively as the overvoltage protection diode of metal-oxide-semiconductor V810 and V811, the effect of resistance R902 and R1034 is the voltage of triode V805 and V806 of releasing when shutting down.The voltage obtained through resistance R811, R812, R813, R814 dividing potential drop enters into the 3rd pin of N810 chip, for correcting the 7th pin output drive pulse waveform.Sampling voltage after dividing potential drop is delivered to the first pin of N810 chip by resistance R826, R827, R828, R805, R829, R830, through N810 chip internal error amplifying circuit relatively after, adjust the output duty cycle of the driving pulse of the 7th pin, control the ON time of metal-oxide-semiconductor V810 and V811, to reach the object of voltage on stable pfc circuit.When occurring that power source loads is extremely overweight; the excessive electric current of metal-oxide-semiconductor V810 and V811 flows through resistance R825, R849, and the pressure drop on resistance R825, R849 will raise, and the voltage of rising is added to the 4th pin of N810 chip through resistance R823; N810 chip quits work, and plays a protective role.When line voltage is too low, the voltage of resistance R1028, R1032, R1026, R1030 and R1031 is low level, triode V804 conducting, the 4th pin output low level, and N810 chip quits work, and forms protective effect to liquid crystal display.The five pin pin of voltage then for N810 chip after resistance R816 and R868 dividing potential drop that energy storage inductor L1 responds to provides zero passage detection signal, controls unlatching and the shutoff of the inner chopping signal of pfc circuit.
The utility model is not limited to above-mentioned embodiment; anyone can draw other various forms of products under enlightenment of the present utility model; above-mentioned embodiment is only schematic; instead of it is restrictive; those of ordinary skill in the art is under enlightenment of the present utility model; do not departing under the ambit that the utility model aim and claim protect, also can make a lot of form, these all belong within protection of the present utility model.
Claims (6)
1. the testing circuit of a liquid crystal display module, it is characterized in that: comprise pfc circuit, described pfc circuit is provided with N810 chip, the first pin of described N810 chip is connected to Voltage Feedback testing circuit, the second pin is connected to soft start protection circuit, 3rd pin is waveform sampling end, 4th pin is connected to current detection circuit, the 5th pin is connected with zero cross detection circuit, the 6th pin ground connection, 7th pin output drive pulse, the 8th pin is connected with feed circuit;
Described Voltage Feedback testing circuit is connected with resistance R826, R827, R828, R805, R829 and R830;
Described soft start protection circuit is connected with electric capacity C1, triode V804 and resistance R1028, R1032, R1026, R1030, R1031, described electric capacity C1 ground connection;
Described current detection circuit is connected with resistance R849 and R825;
Described zero cross detection circuit is connected with energy storage inductor L1, resistance R816 and R868.
2. the testing circuit of a kind of liquid crystal display module according to claim 1, is characterized in that: be connected with resistance R811, R812, R813 and R814 above the 3rd pin of described N810 chip.
3. the testing circuit of a kind of liquid crystal display module according to claim 1, it is characterized in that: the positive half cycle of described driving pulse is connected with resistance R895, diode VD816, metal-oxide-semiconductor V810, resistance R820, diode VD815 and metal-oxide-semiconductor V811, the negative half period of described driving pulse is connected with resistance R836, triode V805 and resistance R821, triode V806.
4. the testing circuit of a kind of liquid crystal display module according to claim 3, it is characterized in that: described metal-oxide-semiconductor V810 is connected with voltage stabilizing diode VZ814, described metal-oxide-semiconductor V811 is connected with voltage stabilizing diode VZ811, described triode V805 is also connected with resistance R902, and described triode V806 is connected with resistance R1034.
5. the testing circuit of a kind of liquid crystal display module according to claim 1, is characterized in that: described feed circuit are provided with commutator tube VZ812, electric capacity C814 and electric capacity C816.
6. the testing circuit of a kind of liquid crystal display module according to claim 1, is characterized in that:
The model of described N810 chip is NCP33262.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420796197.XU CN204331213U (en) | 2014-12-17 | 2014-12-17 | A kind of testing circuit of liquid crystal display module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420796197.XU CN204331213U (en) | 2014-12-17 | 2014-12-17 | A kind of testing circuit of liquid crystal display module |
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| Publication Number | Publication Date |
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| CN204331213U true CN204331213U (en) | 2015-05-13 |
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| CN201420796197.XU Active CN204331213U (en) | 2014-12-17 | 2014-12-17 | A kind of testing circuit of liquid crystal display module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106373540A (en) * | 2016-10-28 | 2017-02-01 | 上海中航光电子有限公司 | Liquid crystal display panel, driving method thereof and liquid crystal display device |
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2014
- 2014-12-17 CN CN201420796197.XU patent/CN204331213U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106373540A (en) * | 2016-10-28 | 2017-02-01 | 上海中航光电子有限公司 | Liquid crystal display panel, driving method thereof and liquid crystal display device |
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