CN201853463U - Power supply device of LCM testing system - Google Patents

Power supply device of LCM testing system Download PDF

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Publication number
CN201853463U
CN201853463U CN2010205414053U CN201020541405U CN201853463U CN 201853463 U CN201853463 U CN 201853463U CN 2010205414053 U CN2010205414053 U CN 2010205414053U CN 201020541405 U CN201020541405 U CN 201020541405U CN 201853463 U CN201853463 U CN 201853463U
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CN
China
Prior art keywords
voltage
unit
chip
power supply
supply
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CN2010205414053U
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Chinese (zh)
Inventor
吴志谋
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惠州泰科立集团股份有限公司
Tcl集团股份有限公司
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Priority to CN2010205414053U priority Critical patent/CN201853463U/en
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Publication of CN201853463U publication Critical patent/CN201853463U/en

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Abstract

The utility model discloses a power supply device of an LCM testing system. The power supply device comprises a power input port, an overvoltage and overcurrent protection module for performing overvoltage and overcurrent protection on the power supply device, and a testing power supply group for providing testing voltage, wherein the power input port, the overvoltage and overcurrent protection module and the testing power supply group are connected in sequence. The power supply device comprises the power input port, the overvoltage and overcurrent protection module and the testing power supply group; the testing power supply group can efficiently output various voltage required for LCM module testing, so as to improve the utilization efficiency of the power supply; and the power supply device can supply power through a 5 V power supply or an independent power supply module, so that a direct-current stabilized voltage supply is saved, the cost is saved, and the power supply device is convenient to carry. Simultaneously, the power supply device tests an LED back light module in a constant current driving mode, and improves the detectable rate of defective LED back light, thereby guaranteeing the quality of products.

Description

A kind of supply unit of LCM test macro
Technical field
The utility model relates to the testing power supply device of LCM module, is specifically related to the improvement to the supply unit of LCM test macro.
Background technology
During LCM (LCD Module, LCD MODULE) test, the power supply that test macro need be used comprises respectively: one, test main system and Peripheral storage device (signal output apparatus) power supply: its voltage comprises 3.3V and 1.8V, the about 150mA of electric current; Two, LCD (Liquid Crystal Display, LCD) drives working power: voltage is 2.8V~3.3V, and electric current is about 15mA; Three, LCM backlight drive power supply: wherein, the voltage of paralleling model is 3.2V, and electric current is 20~200mA, and the voltage of series model is 3.2~20V, and electric current is about 15mA; Four, other peripheral cell working power: its voltage is 3.6~5V, the about 10mA of electric current.
See also Fig. 1, the supply unit of traditional LCM test macro generally comprises: a primary power output unit and a plurality of voltage step-down device.Wherein, the primary power output unit be one can be with the D.C. regulated power supply of output voltage in 0~30V range regulation, its can output system required ceiling voltage is in the LCM test macro, test macro is again by each voltage step-down device, as: LM7805, LM317, AMS1117 etc. produce the required various voltages of LCM test respectively.
The shortcoming of above-mentioned supply unit is: 1, power utilization efficient is very low, on average is lower than 20%; 2, when test, primary input voltage needs often to change, and is unfavorable for the management and the use of voltage, and can be because input error causes overvoltage to burn supply unit; 3, when the test of replacing module, need through repeating to cut off the power supply power up again, frequent such processing ease voltge surge occurs and causes producing test errors, and when powering on, the test macro initialization meeting consumption test duration is unfavorable for the raising of testing efficiency; 4, supply unit need use D.C. regulated power supply, makes it carry inconvenience, and makes the cost of supply unit higher; What 5, the backlight drive of LCM was used is the constant voltage driving mode, different with its normal constant current drive mode condition of using, therefore can cause the bad product of part (bad as the LED electrostatic damage) can't detect when test, has influenced the quality of product.
The utility model content
In view of above-mentioned the deficiencies in the prior art part, the purpose of this utility model is to provide a kind of supply unit of LCM test macro, can improve the rate of energy of supply unit.
In order to achieve the above object, the utility model has been taked following technical scheme:
A kind of supply unit of LCM test macro wherein, comprising: the power input mouth; Be used for described supply unit is carried out the over-voltage over-current protection module of over-voltage over-current protection; Be used to provide the testing power supply group of test voltage; Described power input mouth, over-voltage over-current protection module and testing power supply group are connected successively.
The supply unit of described LCM test macro wherein, also comprises the supply module and the charge management module that is used for supply module is charged and controls that are used for providing supply voltage to described supply unit; Described charge management module is arranged between over-voltage over-current protection module and the testing power supply group, and described supply module is connected with the testing power supply group with charge management module.
The supply unit of described LCM test macro, wherein, described testing power supply group comprises: first voltage regulation unit that is used to export first test voltage; Be used to export second voltage regulation unit of second test voltage; Be used to export a LDO voltage regulation unit of VCI voltage; Be used to export the 2nd LDO voltage regulation unit of IOVCC voltage; LED constant current driving unit in parallel; And LED series connection constant current driving unit; Described first voltage regulation unit, second voltage regulation unit, LED constant current driving unit in parallel are connected with described charge management module with LED series connection constant current driving unit, and a LDO voltage regulation unit is connected with described second voltage regulation unit with the 2nd LDO voltage regulation unit.
The supply unit of described LCM test macro, wherein, described over-voltage over-current protection module comprises fuse, TVS pipe and clamper tube, described fuse is connected between power input mouth and the testing power supply group, one end of described TVS pipe is connected with fuse, other end ground connection, described clamper tube is in parallel with described TVS pipe;
Described power input mouth comprises USB mouth and source of stable pressure jack, and described USB mouth is connected with the over-voltage over-current protection module by a gating unit with the source of stable pressure jack.
The supply unit of described LCM test macro, wherein, described charge management module comprises that model is the charging management chip of EMC5040; The ACIN end of charging management chip is feeder ear, and the BATT end connects described supply module, and the CHG_SB end connects the over-voltage over-current protection unit by a LED lamp, and the PGOODB end connects the over-voltage over-current protection unit by the 2nd LED lamp.
The supply unit of described LCM test macro, wherein, described first voltage regulation unit comprises that model is the first switch voltage-stabilizing chip of LTC3406, and the VIN end of the described first switch voltage-stabilizing chip is feeder ear, and the VOUT end of the first switch voltage-stabilizing chip is used to export described first test voltage.
The supply unit of described LCM test macro, wherein, second voltage regulation unit comprises that model is the second switch voltage stabilizing chip of LTC3441, and the VIN end of described second switch voltage stabilizing chip is feeder ear, and the VOUT end of second switch voltage stabilizing chip is used to export described second test voltage.
The supply unit of described LCM test macro, wherein, the one LDO voltage regulation unit comprises that model is the LDO chip of LTC1844, the VIN end of described LDO chip is feeder ear, the OUT end of LDO chip is used to export VCI voltage, and this OUT end is connected with the ADJ end of LDO chip by variable resistor, and/SHDN end is the I/O mouth of LDO chip, is used to open or close the power supply output of LDO chip.
The supply unit of described LCM test macro, wherein, described LED constant current driving unit in parallel comprises that model is the LED chip for driving of SC656, the IN end of a described LED chip for driving is feeder ear, the ENS end is a LED chip for driving I/O mouth, be used to open or close the power supply output of a LED chip for driving, between the OUT of LED chip for driving end and BL1-BL7 end, connect LED lamp group in parallel.
The supply unit of described LCM test macro, wherein, described LED series connection constant current driving unit comprises that model is the 2nd LED chip for driving of SC4538, the IN end of described the 2nd LED chip for driving is feeder ear, the EN end is the enable port of the 2nd LED chip for driving, be used to open or close the power supply output of the 2nd LED chip for driving, between the BL of the 2nd LED chip for driving end and OUT end, connect the LED lamp group of series connection.
The supply unit of a kind of LCM test macro that the utility model provides; it comprises power input mouth, over-voltage over-current protection module and testing power supply group; described testing power supply group can efficiently be exported the required various voltages of LCM module testing; improved the utilization ratio of power supply; and this supply unit can or be powered by supply module separately by the power supply of 5V power supply; saved a D.C. regulated power supply, saved the cost of supply unit, and be easy to carry.Simultaneously, this supply unit has improved the bad recall rate of LED-backlit, thereby has guaranteed the quality of product with constant current drive mode test LED-backlit module.
Description of drawings
Fig. 1 is a prior art LCM testing power supply schematic representation of apparatus;
The structured flowchart of the LCM test macro supply unit that Fig. 2 provides for the utility model embodiment;
The schematic diagram of the LCM test macro supply unit that Fig. 3 provides for the utility model embodiment;
The power input mouth that Fig. 4 provides for the utility model embodiment and the circuit theory diagrams of over-voltage over-current protection module;
The circuit theory diagrams of the charge management module that Fig. 5 provides for the utility model embodiment;
The circuit theory diagrams of first voltage regulation unit that Fig. 6 provides for the utility model embodiment;
The circuit theory diagrams of second voltage regulation unit that Fig. 7 provides for the utility model embodiment;
The circuit theory diagrams of the LDO voltage regulation unit that Fig. 8 provides for the utility model embodiment;
The circuit theory diagrams of the 2nd LDO voltage regulation unit that Fig. 9 provides for the utility model embodiment;
The circuit theory diagrams of the LED that Figure 10 provides for the utility model embodiment constant current driving unit in parallel;
The circuit theory diagrams of the LED series connection constant current driving unit that Figure 11 provides for the utility model embodiment.
Embodiment
The utility model provides a kind of supply unit of LCM test macro, and is clearer, clear and definite for making the purpose of this utility model, technical scheme and effect, below with reference to accompanying drawing and give an actual example the utility model is further described.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
See also Fig. 2, the supply unit of the LCM test macro that the utility model embodiment provides comprises power input mouth 110, over-voltage over-current protection module 120 and the testing power supply group 130 that connects successively.Described power input mouth 110 is used to insert power supply, and the supply voltage of output 5V is given means of power.Over-voltage over-current protection module 120 is used for described supply unit is carried out over-voltage over-current protection, thereby avoids supply unit to burn out.Described testing power supply group 130 is used for efficiently exporting the required various test voltages of LCM module test, thereby satisfies the testing requirement of LCM module.
See also Fig. 3, described testing power supply group 130 comprises first voltage regulation unit 131, second voltage regulation unit 132, a LDO voltage regulation unit 133, the 2nd LDO voltage regulation unit 134, LED constant current driving unit 135 in parallel and LED series connection constant current driving unit 136.
Wherein, described first voltage regulation unit 131 is used to export the first required test voltage of LCM module test, and this first test voltage is 1.8V.Second voltage regulation unit 132 is used to export the second required test voltage of LCM module test, and this second test voltage is 3.3V.
A described LDO voltage regulation unit 133 is used to export the required VCI voltage of LCM module test (being the interior power supply circuit operating voltage of LCM test with LCD Driver IC), and the 2nd LDO voltage regulation unit 134 is used to export the required IOVCC voltage of LCM module test (being the internal interface circuit voltage of LCM test with LCD Driver IC).
Described LED constant current driving unit 135 in parallel is the LED-backlit driving circuit, can produce nearly 7 tunnel LED constant-current driving voltage in parallel, and LED series connection constant current driving unit 136 is used to export LED series connection constant-current driving voltage, can drive the nearly LED of 10 series connection simultaneously.
See also Fig. 3 and Fig. 4; described power input mouth 110 comprises USB mouth J2 and source of stable pressure jack DC_JACK; this USB mouth J2 and source of stable pressure jack DC_JACK are used to export the supply voltage of 5V, and are connected with over-voltage over-current protection module 120 by a gating unit.In the present embodiment, described gating unit is a single-pole double-throw switch (SPDT) J1-A, and USB mouth J2 and source of stable pressure jack DC_JACK select conducting by this single-pole double-throw switch (SPDT) J1-A, thereby provides stable power voltage for the testing power supply group.
Wherein, described over-voltage over-current protection module 120 comprises fuse F1, TVS pipe D1 (Transient Voltage Suppressor; Transient Voltage Suppressor) and clamper tube D2; this fuse F1 is PTC device (Positive Temperature Coefficient; positive temperature coefficient (PTC)), and be connected between power input mouth 110 and the testing power supply group 130, the end of TVS pipe D1 is connected with fuse F1; other end ground connection, described clamper tube D2 is attempted by the two ends of TVS pipe.
See also Fig. 3 and Fig. 5, described supply unit also comprises supply module 140 and charge management module 150.Described supply module 140 is connected with testing power supply group 130; be used for when described power input mouth 110 does not insert supply voltage; provide supply voltage to testing power supply group 130; charge management module 150 is arranged between over-voltage over-current protection module 120 and the testing power supply group 130; and be connected with supply module 140; be used for charging, and be full of electricity or, be 130 power supplies of follow-up testing power supply group when supply module 140 not during place in circuit at supply module 140 to supply module 140.
In the present embodiment, described supply module 140 adopts lithium battery, and charge management module 150 comprises that model is charging management chip U1 and the peripheral components thereof of EMC5040.The ACIN end of charging management chip U1 is the feeder ear of charging management chip U1, is used to insert the external power supply of 5V.
The BATT end of charging management chip U1 is connected with the positive pole of first voltage regulation unit 131, second voltage regulation unit 132, LED constant current driving unit 135 in parallel, LED series connection constant current driving unit 136 and lithium battery, thereby give lithium cell charging, perhaps be full of or lithium battery when not inserting this supply unit when the lithium battery electric weight, give this first voltage regulation unit 131, second voltage regulation unit 132, LED constant current driving unit 135 in parallel and 136 power supplies of LED series connection constant current driving unit.
The TS end (test lead) of charging management chip U1 links to each other with the negative temperature coefficient voltage dependent resistor (VDR) NTC of lithium battery interior, and whether be used to test lithium battery overheated.If overheated, the resistance decreasing of voltage dependent resistor (VDR) NTC, the TS terminal voltage of charging management chip U1 is lower than the minimum value V of setting value with step-down when this voltage TMINThe time, will stop charging automatically.If lithium battery takes out, be equivalent to the resistance infinity of voltage dependent resistor (VDR) NTC this moment, and then the TS terminal voltage of charging management chip U1 uprises, and is higher than the maximal value V of setting value when this voltage TMAXThe time, also stop lithium cell charging automatically, but can the voltage of TS end be descended by regulating first resistance R 1 that is connected with the TS end this moment, be lower than setting value V up to voltage TMAX, can directly use this moment charging management chip U1 output supply voltage (being charging voltage VBAT) to give follow-up circuit supply.
Wherein, the CHG_SB end of charging management chip U1 is connected with second resistance R 2 by a LED lamp D3; this second resistance R 2 is connected with over-voltage over-current protection module 120; represent that by lighting a LED lamp D3 lithium battery charges, and can hold the 3rd resistance R 3 that is connected that the size of the maximum current of charging output is set by regulating with the ISETA of charging management chip U1.
The PGOODB end of charging management chip U1 connects the 4th resistance R 4, the four resistance R 4 by the 2nd LED lamp D4 and is connected with over-voltage over-current protection module 120, represents that by lighting the 2nd LED lamp D4 lithium battery is full of.The ENB of charging management chip U1 end is for enabling the control input end, and low level is effective.
Should be noted that in other embodiments described supply module can be non-rechargeable battery, such as dry cell, can save charge management module this moment, only needs to change battery and get final product when battery electric quantity is used up.
See also Fig. 3 and Fig. 6, described first voltage regulation unit 131 comprises that model is first switch voltage-stabilizing chip U2 and the peripheral components thereof of LTC3406, and this first switch voltage-stabilizing chip U2 is used to produce stable 1.8V supply voltage, uses for the LCM test macro.The VIN end of the described first switch voltage-stabilizing chip U2 is feeder ear, it is connected with supply module with the BATT end of charging management chip, the VOUT end of the first switch voltage-stabilizing chip U2 is used to export described first test voltage (being the supply voltage of 1.8V), uses for the LCM test macro.
See also Fig. 3 and Fig. 7, second voltage regulation unit 132 comprises that model is second switch voltage stabilizing chip U3 and the peripheral components thereof of LTC3441, and this second switch voltage stabilizing chip U3 is used to produce stable 3.3V supply voltage.The VIN end of described second switch voltage stabilizing chip U3 is the feeder ear of this chip, and it is connected with supply module with the BATT end of charging management chip, and the VOUT end of second switch voltage stabilizing chip U3 is used to export described second test voltage.
Wherein, described first voltage regulation unit 131 and second voltage regulation unit 132 are the primary power part of LCM test macro, the first switch voltage-stabilizing chip U2 and second switch voltage stabilizing chip U3 are the DC/DC conversion chip of high frequency switch power, its efficient is up to 95%, improved the energy utilization rate of LCM test macro greatly, the specifications that explanation sees also this family chip have been set as for the concrete circuit of this two chips.
The generation of the LCM module power supply that the utility model embodiment provides and control section comprise a LDO voltage regulation unit and the 2nd LDO voltage regulation unit.See also Fig. 8, a LDO voltage regulation unit comprises that model is a LDO chip U4 and the peripheral components thereof of LTC1844, and a LDO voltage regulation unit is used to produce the LCM_VCI voltage of LCM module test usefulness.
The VIN end of a described LDO chip U4 is feeder ear, it is connected with the VOUT end of second switch voltage stabilizing chip, the OUT end of the one LDO chip U4 is used to export VCI voltage, and this OUT end is connected with the ADJ end of this chip by variable resistor VR1, can be by regulating this variable resistor VR1, output voltage parameter is fed back to the ADJ end of a LDO chip U4, thereby export different test voltages, to satisfy different test requests.
A described LDO chip U4 /the SHDN end is the I/O mouth of a LDO chip U4, be used to open or close the power supply output of a LDO chip U4, when switching the LCM test, only need to disconnect or the voltage output of restarting this LDO chip gets final product by this signal, and need not to disconnect the primary power of test macro, saved the on time of test macro.
In the present embodiment, the one LDO voltage regulation unit and the 2nd LDO voltage regulation unit are low pressure reduction voltage regulation unit, see also Fig. 9, the 2nd LDO voltage regulation unit comprises that model is the 2nd LDO chip U5 and the peripheral components thereof of LTC1844, is used for output and produces LCM test LCM_IOVCC voltage.Because the 2nd LDO voltage regulation unit is identical with the circuit working principle with the composition device of a LDO voltage regulation unit, repeats no more herein.
The generation of the LED-backlit power supply of the LCM that the utility model embodiment provides and control section comprise LED constant current driving unit in parallel and the LED constant current driving unit of connecting.
See also Figure 10, described LED constant current driving unit in parallel comprises that model is a LED chip for driving U6 and the peripheral circuit thereof of SC656.The ENS end of the one LED chip for driving U6 is this chip I/O mouth, is used to open or close the power supply output of a LED chip for driving, can bring in the switch of this chip of control by this ENS.
The IN end of a described LED chip for driving U6 is the feeder ear of this chip, hold to the LED lamp group that connects parallel connection between the BL7 end at the OUT of LED chip for driving U6 end and BL1, the one LED chip for driving can produce nearly 7 tunnel LED constant-current driving power supply in parallel, thereby can drive 7 parallel connection LED lamp simultaneously, and the average utilization ratio of power supply is more than 70%.
See also Figure 11, LED series connection constant current driving unit comprises that model is the 2nd LED chip for driving U7 and the peripheral components thereof of SC4538.The IN end of the 2nd LED chip for driving U7 is the feeder ear of this chip, the EN end is enable port (being the I/O mouth of this chip), be used to open or close the power supply output of the 2nd LED chip for driving U7, the LED lamp group that between the BL of the 2nd LED chip for driving U7 end and OUT end, connects series connection, the LED lamp group of this series connection is made up of 10 LED lamp, thereby the 2nd LED chip for driving U7 can drive the nearly LED lamp of 10 series connection simultaneously, and the average utilization ratio of this chip power is more than 80%.LED chip for driving that the utility model embodiment provides and the 2nd LED chip for driving have satisfied the testing requirement of various LCM constant current backlight.
In sum; the supply unit of a kind of LCM test macro that the utility model provides can be tested by the undersized LCD demonstration of centering module; it comprises power input mouth, over-voltage over-current protection module and testing power supply group; its testing power supply group comprises two HF switch voltage stabilizing chips (i.e. the first voltage stabilizing chip and the second voltage stabilizing chip), LED constant current driving unit in parallel and LED series connection constant current driving unit; can efficiently export the required various test voltages of LCM module test; improved the utilization ratio of power supply; and supply voltage is more stable, and is more reliable.
This supply unit has used the single 5V power supply input that is easy to obtain, and by the power supply mode that supply module is powered, has saved a D.C. regulated power supply, has saved the cost of supply unit, and has been easy to carry, and makes this supply unit convenient and practical.
When test, cut-offfing of this supply unit may command LCM and backlight drive power supply thereof improved the testing efficiency of LCM, simultaneously, the backlight drive power supply of this supply unit adopts constant current drive mode to improve the bad recall rate of LED-backlit, thereby has guaranteed the quality of product.
Be understandable that; for those of ordinary skills; can be equal to replacement or change according to the technical solution of the utility model and utility model design thereof, and all these changes or replacement all should belong to the protection domain of the appended claim of the utility model.

Claims (10)

1. the supply unit of a LCM test macro is characterized in that, comprising:
The power input mouth;
Be used for described supply unit is carried out the over-voltage over-current protection module of over-voltage over-current protection;
Be used to provide the testing power supply group of test voltage;
Described power input mouth, over-voltage over-current protection module and testing power supply group are connected successively.
2. the supply unit of LCM test macro according to claim 1 is characterized in that, also comprises the supply module and the charge management module that is used for supply module is charged and controls that are used for providing supply voltage to described supply unit; Described charge management module is arranged between over-voltage over-current protection module and the testing power supply group, and described supply module is connected with the testing power supply group with charge management module.
3. the supply unit of LCM test macro according to claim 2 is characterized in that, described testing power supply group comprises:
Be used to export first voltage regulation unit of first test voltage;
Be used to export second voltage regulation unit of second test voltage;
Be used to export a LDO voltage regulation unit of VCI voltage;
Be used to export the 2nd LDO voltage regulation unit of IOVCC voltage;
LED constant current driving unit in parallel; And
The LED constant current driving unit of connecting;
Described first voltage regulation unit, second voltage regulation unit, LED constant current driving unit in parallel are connected with described charge management module with LED series connection constant current driving unit, and a LDO voltage regulation unit is connected with described second voltage regulation unit with the 2nd LDO voltage regulation unit.
4. the supply unit of LCM test macro according to claim 1 is characterized in that,
Described over-voltage over-current protection module comprises fuse, TVS pipe and clamper tube, and described fuse is connected between power input mouth and the testing power supply group, and an end of described TVS pipe is connected with fuse, other end ground connection, and described clamper tube is in parallel with described TVS pipe;
Described power input mouth comprises USB mouth and source of stable pressure jack, and described USB mouth is connected with the over-voltage over-current protection module by a gating unit with the source of stable pressure jack.
5. the supply unit of LCM test macro according to claim 2 is characterized in that, described charge management module comprises that model is the charging management chip of EMC5040; The ACIN end of charging management chip is feeder ear, and the BATT end connects described supply module, and the CHG_SB end connects the over-voltage over-current protection unit by a LED lamp, and the PGOODB end connects the over-voltage over-current protection unit by the 2nd LED lamp.
6. the supply unit of LCM test macro according to claim 3, it is characterized in that, described first voltage regulation unit comprises that model is the first switch voltage-stabilizing chip of LTC3406, the VIN end of the described first switch voltage-stabilizing chip is feeder ear, and the VOUT end of the first switch voltage-stabilizing chip is used to export described first test voltage.
7. the supply unit of LCM test macro according to claim 3, it is characterized in that, second voltage regulation unit comprises that model is the second switch voltage stabilizing chip of LTC3441, the VIN end of described second switch voltage stabilizing chip is feeder ear, and the VOUT end of second switch voltage stabilizing chip is used to export described second test voltage.
8. the supply unit of LCM test macro according to claim 3, it is characterized in that, the one LDO voltage regulation unit comprises that model is the LDO chip of LTC1844, the VIN end of described LDO chip is feeder ear, the OUT end of LDO chip is used to export VCI voltage, and this OUT end is connected with the ADJ end of LDO chip by variable resistor, and/SHDN end is the I/O mouth of LDO chip, is used to open or close the power supply output of LDO chip.
9. the supply unit of LCM test macro according to claim 3, it is characterized in that, described LED constant current driving unit in parallel comprises that model is the LED chip for driving of SC656, the IN end of a described LED chip for driving is feeder ear, the ENS end is the I/O mouth of a LED chip for driving, be used to open or close the power supply output of a LED chip for driving, between the OUT of LED chip for driving end and BL1-BL7 end, connect LED lamp group in parallel.
10. the supply unit of LCM test macro according to claim 3, it is characterized in that, described LED series connection constant current driving unit comprises that model is the 2nd LED chip for driving of SC4538, the IN end of described the 2nd LED chip for driving is feeder ear, the EN end is the enable port of the 2nd LED chip for driving, be used to open or close the power supply output of the 2nd LED chip for driving, between the BL of the 2nd LED chip for driving end and OUT end, connect the LED lamp group of series connection.
CN2010205414053U 2010-09-25 2010-09-25 Power supply device of LCM testing system CN201853463U (en)

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102904207A (en) * 2012-09-28 2013-01-30 西安开元电子实业有限公司 Overvoltage protector
CN103048564A (en) * 2012-12-20 2013-04-17 苏州大项智能科技有限公司 Tester with multiple practical output power supplies
CN104485652A (en) * 2014-12-18 2015-04-01 江苏天安智联科技股份有限公司 Reverse connection prevention and surging prevention device for vehicle terminal power supply
CN104635362A (en) * 2013-11-08 2015-05-20 群创光电股份有限公司 Display panel and display equipment using same
CN105116355A (en) * 2015-09-15 2015-12-02 武汉精测电子技术股份有限公司 LED module backlight lamp string detection device and detection method thereof
CN106341035A (en) * 2016-10-21 2017-01-18 无锡爱睿芯电子有限公司 Power switch module
CN107068022A (en) * 2017-03-08 2017-08-18 深圳市帝晶光电科技有限公司 A kind of control circuit of efficient LCM tests

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102904207A (en) * 2012-09-28 2013-01-30 西安开元电子实业有限公司 Overvoltage protector
CN103048564A (en) * 2012-12-20 2013-04-17 苏州大项智能科技有限公司 Tester with multiple practical output power supplies
CN104635362A (en) * 2013-11-08 2015-05-20 群创光电股份有限公司 Display panel and display equipment using same
CN104485652A (en) * 2014-12-18 2015-04-01 江苏天安智联科技股份有限公司 Reverse connection prevention and surging prevention device for vehicle terminal power supply
CN105116355A (en) * 2015-09-15 2015-12-02 武汉精测电子技术股份有限公司 LED module backlight lamp string detection device and detection method thereof
CN106341035A (en) * 2016-10-21 2017-01-18 无锡爱睿芯电子有限公司 Power switch module
CN107068022A (en) * 2017-03-08 2017-08-18 深圳市帝晶光电科技有限公司 A kind of control circuit of efficient LCM tests

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