CN205049834U - Hot plug LCD screen circuit - Google Patents
Hot plug LCD screen circuit Download PDFInfo
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- CN205049834U CN205049834U CN201520379586.7U CN201520379586U CN205049834U CN 205049834 U CN205049834 U CN 205049834U CN 201520379586 U CN201520379586 U CN 201520379586U CN 205049834 U CN205049834 U CN 205049834U
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Abstract
The present case is a hot plug LCD screen circuit, includes: power module, the LCD screen module, power module passes through the PMOS module and the resistance module is connected with the LCD screen module, and with the current detection module that the resistance module is connected, current detection module includes the undercurrent monitoring and overflows the monitoring that current detection module comprises a current detection chip and a MCU chip, current detection module one end connection power module, other end connection PMOS module and resistance module, wherein, when inserting the LCD screen module, current detection module detects a running current, and the PMOS module switches on, and the electric current inserts the LCD screen through the PMOS module, when power module broke off with the LCD screen module, current detection module monitored undercurrent, the disconnection of PMOS module, when taking place the short circuit, current detection module monitors and overflows, and the resistance module limits most electric current that passes through, can protect the LCD screen module, avoids the damage of LCD screen.
Description
Technical field
The utility model relates to plug-and-play circuit, particularly relates to a kind of plug-and-play circuit for liquid crystal display.
Background technology
Hot plug and warm swap, refer to and a certain electron device be inserted into the process of taking out a certain electron device in charging equipment or from charging equipment.In the process of hot plug, usually can produce a larger electric current and voltage instantaneously, and also may occur the phenomenon of Electro-static Driven Comb, and the excess current produced, transient voltage and Electro-static Driven Comb all can bring infringement to electron device or charging equipment.
On the other hand, in many control system, electron device is usually by there being the connecting line of a lot of pin connectivity port corresponding to equipment to connect, in hot plug process, if connecting line has portions incline, when pin-pitch is less, easily cause short circuit between pin, burn the situation of electron device or equipment.
At present, general liquid crystal display manufacturer requires that user cannot carry out hot plug, to avoid damaging liquid crystal display, but actually to use, to occur because the unconscious operation of personnel or button malfunction etc. unavoidably have hot plug situation, thus causes damage of product, scraps.Usual liquid crystal display device power supply (DPS) model calling refers to accompanying drawing 1, when power module is direct and liquid crystal screen module carries out access and opening operation operates, can produce sparking, the phenomenon of even short circuit.
Utility model content
For overcoming the deficiencies in the prior art, the purpose of this utility model is to provide a kind of plug-and-play circuit for liquid crystal display, avoids the liquid crystal display because causing in hot plug process to damage.
For achieving the above object, the utility model is achieved through the following technical solutions:
A kind of hot plug liquid crystal display circuit, comprise: power module, liquid crystal screen module, described power module is connected with described liquid crystal screen module by PMOS module and resistive module, also comprise the current detection module be connected with described resistive module, described current detection module comprises undercurrent monitoring and overcurrent monitoring, described current detection module is made up of a current detecting chip and a MCU chip, described current detection module one end connects described power module, and the other end connects described PMOS module and resistive module;
Wherein, when not accessing liquid crystal screen module, current detection module detects that resistive module two ends electric current is 0, circuit access failure, the not conducting of described PMOS module; When accessing liquid crystal screen module, described current detection module detects a running current, the conducting of described PMOS module, and electric current is through PMOS module access liquid crystal display; When power module and liquid crystal screen module disconnect, described current detection module monitors undercurrent, and described PMOS module disconnects; When a short circuit occurs, described current detection module monitors overcurrent, and resistive module restriction is most by electric current, for the protection of liquid crystal screen module.
Preferably, described hot plug liquid crystal display circuit, wherein, described current detecting chip model is INA209.INA209 mono-has 16 pins: Vin+, Vin-, Convert, GND, Vs, GPIO, Critical, Overlimit, Warning, Vs, GND, SCL, SDA, A0, A1, Alert, wherein, VIN+ and VIN-of current detecting termination current detecting chip, I2C meets SDA and SCL of current detecting chip, the GND ground connection of current detecting chip, the Vs of current detecting chip connects SDA and SCL by two resistance, and all the other pins are unsettled not to be connect.
Preferably, described hot plug liquid crystal display circuit, wherein, described MCU chip chip model is C8051F310.Wherein, the P0.3 mouth of I2C_SDA termination MCU chip, the P0.2 mouth of I2C_SCL termination MCU chip, the P0.1 mouth of PMOS termination MCU chip.
Preferably, described hot plug liquid crystal display circuit, wherein, described resistive module comprises a current-limiting resistance R10, and described current-limiting resistance one end connects one end and the current detection module of PMOS module, and the other end connects the other end and the liquid crystal screen module of PMOS module.
Preferably, described hot plug liquid crystal display circuit, wherein, described PMOS module comprises a NMOS, a PMOS.
Preferably, the grid of described NMOS connects the Signal transmissions end of described current detection module by resistance, the source ground of NMOS, NMOS drain electrode connects described PMOS grid by resistance, described one end of pmos source connecting resistance module and one end of current detection module, the other end of PMOS drain electrode connecting resistance module and liquid crystal screen module.
The beneficial effects of the utility model: when accessing liquid crystal screen module, described current detection module detects a running current, the conducting of described PMOS module, electric current is through PMOS module access liquid crystal display; When power module and liquid crystal screen module disconnect, undercurrent monitoring module monitors is to undercurrent, and described PMOS module disconnects; When a short circuit occurs, resistive module is shared most by electric current, can protect liquid crystal screen module, avoids the damage of liquid crystal display; This case, by constantly detecting the electric current of corresponding module connector, realizes different actions, effectively can avoid the generation of hot plug situation, thus extends the serviceable life of liquid crystal display; The equipment of the liquid crystal display of this society plug simultaneously circuit is simple, and detection efficiency is high and cost is lower.
Accompanying drawing explanation
Fig. 1 is the liquid crystal display device power supply (DPS) model calling figure in hot plug liquid crystal display circuitry. BACKGROUND described in the utility model;
Fig. 2 is the circuit block diagram in the hot plug liquid crystal display circuit described in the utility model one embodiment;
Fig. 3 is the plug-and-play circuit schematic diagram in the hot plug liquid crystal display circuit described in the utility model one embodiment;
Fig. 4 is the MCU chip connecting circuit figure in the plug-and-play circuit in the hot plug liquid crystal display circuit described in the utility model one embodiment.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail, can implements according to this with reference to instructions word to make those skilled in the art.
A kind of hot plug liquid crystal display circuit, refer to accompanying drawing 2, comprise: power module, liquid crystal screen module, described power module is connected with described liquid crystal screen module by PMOS module and resistive module, also comprise the current detection module be connected with described resistive module, described current detection module comprises undercurrent monitoring and overcurrent monitoring, described current detection module is made up of a current detecting chip and a MCU chip, described current detection module one end connects described power module, and the other end connects described PMOS module and resistive module;
Wherein, when not accessing liquid crystal screen module, current detection module detects that resistive module two ends electric current is 0, circuit access failure, the not conducting of described PMOS module; When accessing liquid crystal screen module, described current detection module detects a running current, the conducting of described PMOS module, and electric current is through PMOS module access liquid crystal display; When power module and liquid crystal screen module disconnect, described current detection module monitors undercurrent, and described PMOS module disconnects; When a short circuit occurs, described current detection module monitors overcurrent, and resistive module restriction is most by electric current, for the protection of liquid crystal screen module.
Further, refer to accompanying drawing 3, described current detecting chip model is INA209.INA209 mono-has 16 pins: Vin+, Vin-, Convert, GND, Vs, GPIO, Critical, Overlimit, Warning, Vs, GND, SCL, SDA, A0, A1, Alert, wherein, VIN+ and VIN-of current detecting termination current detecting chip, I2C meets SDA and SCL of current detecting chip, the Vs of current detecting chip connects SDA and SCL by two resistance, the GND ground connection of current detecting chip, all the other pins are unsettled not to be connect.
Further, refer to accompanying drawing 4, described MCU chip chip model is C8051F310.Wherein, the P0.3 mouth of I2C_SDA termination MCU chip, the P0.2 mouth of I2C_SCL termination MCU chip, the P0.1 mouth of PMOS termination MCU chip.
Further, described resistive module comprises a current-limiting resistance R10, and described current-limiting resistance one end connects one end and the current detection module of PMOS module, and the other end connects the other end and the liquid crystal screen module of PMOS module.
Further, described PMOS module comprises a NMOS, a PMOS.
Further, the grid of described NMOS connects the Signal transmissions end of described current detection module by resistance, the source ground of NMOS, NMOS drain electrode connects described PMOS grid by resistance, described one end of pmos source connecting resistance module and one end of current detection module, the other end of PMOS drain electrode connecting resistance module and liquid crystal screen module.
Although embodiment of the present utility model is open as above, but it is not restricted to listed in instructions and embodiment utilization, it can be applied to various applicable field of the present utility model completely, for those skilled in the art, can easily realize other amendment, therefore do not deviating under the universal that claim and equivalency range limit, the utility model is not limited to specific details and illustrates here and the legend described.
Claims (6)
1. a hot plug liquid crystal display circuit, it is characterized in that, comprise: power module, liquid crystal screen module, described power module is connected with described liquid crystal screen module by PMOS module and resistive module, also comprise the current detection module be connected with described resistive module, described current detection module comprises undercurrent monitoring and overcurrent monitoring, described current detection module is made up of a current detecting chip and a MCU chip, described current detection module one end connects described power module, and the other end connects described PMOS module and resistive module;
Wherein, when not accessing liquid crystal screen module, current detection module detects that resistive module two ends electric current is 0, circuit access failure, the not conducting of described PMOS module; When accessing liquid crystal screen module, described current detection module detects a running current, the conducting of described PMOS module, and electric current is through PMOS module access liquid crystal display; When power module and liquid crystal screen module disconnect, described current detection module monitors undercurrent, and described PMOS module disconnects; When a short circuit occurs, described current detection module monitors overcurrent, and resistive module restriction is most by electric current, for the protection of liquid crystal screen module.
2. hot plug liquid crystal display circuit as claimed in claim 1, it is characterized in that, described current detecting chip model is INA209.
3. hot plug liquid crystal display circuit as claimed in claim 2, it is characterized in that, described MCU chip chip model is C8051F310.
4. hot plug liquid crystal display circuit as claimed in claim 3, it is characterized in that, described resistive module comprises a current-limiting resistance, and described current-limiting resistance one end connects one end and the current detection module of PMOS module, and the other end connects the other end and the liquid crystal screen module of PMOS module.
5. hot plug liquid crystal display circuit as claimed in claim 4, it is characterized in that, described PMOS module comprises a NMOS, a PMOS.
6. hot plug liquid crystal display circuit as claimed in claim 5, it is characterized in that, the grid of described NMOS connects the Signal transmissions end of described current detection module by resistance, the source ground of NMOS, NMOS drain electrode connects described PMOS grid by resistance, described one end of pmos source connecting resistance module and one end of current detection module, the other end of PMOS drain electrode connecting resistance module and liquid crystal screen module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520379586.7U CN205049834U (en) | 2015-06-05 | 2015-06-05 | Hot plug LCD screen circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520379586.7U CN205049834U (en) | 2015-06-05 | 2015-06-05 | Hot plug LCD screen circuit |
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| Publication Number | Publication Date |
|---|---|
| CN205049834U true CN205049834U (en) | 2016-02-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520379586.7U Active CN205049834U (en) | 2015-06-05 | 2015-06-05 | Hot plug LCD screen circuit |
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| CN (1) | CN205049834U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107316598A (en) * | 2017-08-14 | 2017-11-03 | 南京中电熊猫平板显示科技有限公司 | A kind of hot plug fault control device and method |
| CN107316597A (en) * | 2017-08-11 | 2017-11-03 | 深圳同兴达科技股份有限公司 | A kind of liquid crystal display module open circuit short circuit detecting system |
| CN110174549A (en) * | 2019-05-24 | 2019-08-27 | 北京无线电测量研究所 | For amplifying low current double monitoring circuit, the amplification function separating device of function subassembly |
-
2015
- 2015-06-05 CN CN201520379586.7U patent/CN205049834U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107316597A (en) * | 2017-08-11 | 2017-11-03 | 深圳同兴达科技股份有限公司 | A kind of liquid crystal display module open circuit short circuit detecting system |
| CN107316597B (en) * | 2017-08-11 | 2020-11-13 | 深圳同兴达科技股份有限公司 | Open circuit and short circuit detection system of liquid crystal display module |
| CN107316598A (en) * | 2017-08-14 | 2017-11-03 | 南京中电熊猫平板显示科技有限公司 | A kind of hot plug fault control device and method |
| CN110174549A (en) * | 2019-05-24 | 2019-08-27 | 北京无线电测量研究所 | For amplifying low current double monitoring circuit, the amplification function separating device of function subassembly |
| CN110174549B (en) * | 2019-05-24 | 2021-09-10 | 北京无线电测量研究所 | Low-current dual monitoring circuit for amplifying power dividing component and amplifying power dividing device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 215000 No. 18 Weiwen Road, Suzhou Industrial Park, Jiangsu Province Patentee after: Hai Electronic Technology (Suzhou) Co., Ltd. Address before: 215000 No. 18 Weiwen Road, Suzhou Industrial Park, Jiangsu Province Patentee before: SUZHOU INDUSTRIAL PARK HIDEA MECHATRONICS TECHNOLOGY CO., LTD. |