CN102361536B - Rapid detection and restoration method for short-circuit fault of circuit board - Google Patents
Rapid detection and restoration method for short-circuit fault of circuit board Download PDFInfo
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- CN102361536B CN102361536B CN201110164594.6A CN201110164594A CN102361536B CN 102361536 B CN102361536 B CN 102361536B CN 201110164594 A CN201110164594 A CN 201110164594A CN 102361536 B CN102361536 B CN 102361536B
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Abstract
The invention relates to a rapid detection and restoration method for a short-circuit fault. It is unnecessary to find out an exact short-circuit pin on a circuit board and a principle of fusing of an over-current tin wire can be directly utilized, so that a soldering tin at a short-circuit point can be forced to be fused; therefore, the short-circuit fault can be eliminated. According to the method provided in the invention, a circuit board on which there is a short circuit can be rapidly restored; and labor hours can be reduced and the efficiency can be improved; moreover, a problem that a circuit board can not be restored can be solved, wherein the problem is caused because a short-circuit occurrence position on the circuit board can not be found according to the current method.
Description
Technical field
While the present invention relates to circuit board paster, cause detection and the restorative procedure of device pin short circuit.
Background technology
Electronic circuit integrated level is more and more higher, and chip pin is also more intensive, and in existing circuit board manufacturing process, due to the control of furnace temperature and the assurance of time unreasonable, when paster, cause components and parts pin to take tin, short circuit, flying probe cannot pass through; Existing solution one by one device is investigated, and finds out shorted pins and again welds, and shortcoming is that efficiency is low, and system that pin intensive high for integrated level, and existing method cannot realize.
Summary of the invention
The short-circuit fault of circuit board restorative procedure that the object of this invention is to provide a kind of overcurrent Fuse Type.The method is without finding out shorted pins definite on circuit board, directly use the principle of overcurrent tin silk fusing, force the scolding tin fusing of short dot, thereby short trouble is got rid of, so can repair rapidly the circuit board being short-circuited, reduce work hours, raise the efficiency, solve the difficult problem that existing method cannot be repaired because can not find circuit board location of short circuit.
Realize technical scheme of the present invention, comprise detection method and repair step:
Detection method: the electric power loop of determining shorted to earth on circuit board, by the instrument (as universal instrument) of energy measuring resistance, measure power output end to the resistance of zone network, if resistance is 0 Ω or much smaller than load resistance, be that power supply is directly connected and formed closed-loop path with ground by wire without overload, conclude this electric power loop short circuit.Repairing step carries out around this short-circuit loop exactly.
Repair step: directly use the mode of overcurrent tin silk fusing, specific as follows:
The corresponding power supply chip in loop (non-transformer chip can be skipped this step) of the lower shorted to earth of dismounting;
Get all adjustable DC power supply (general laboratory DC stable power supply of an electric current, voltage, as DC0～30V/3A power supply), electric current is adjusted to 0 ampere of position of minimum shelves, voltage is adjusted to the position of short-circuit loop rated operational voltage, and (load rating operating voltage as corresponding in short-circuit loop is 3.3V, supply voltage is adjusted to 3.3V position), connect the power supply that mixes up and provide rated voltage for this short-circuit loop;
Rotation DC power supply current knob, the supply current that makes this short-circuit loop progressively increases with the stepping of 0.01A, utilize short dot resistance little, by the large characteristic of current in the short, according to Joule law, the heat that electric current produces by conductor is directly proportional with the quadratic power of electric current, follows the resistance of conductor to be directly proportional, time with energising is directly proportional, and short dot temperature will increase gradually and reach scolding tin fusing point and fused; The current value of DC power supply indication sharply diminishes and finally remains unchanged, and shows that the scolding tin in shorted pins fuses, and short trouble is successfully got rid of.
The beneficial effect that the present invention has: in practical operation, needn't know the particular location of short circuit, have method simple, fast, accurately, efficiency high.
Accompanying drawing explanation
Fig. 1 is flow chart of the present invention.
Fig. 2-4 are practical application schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described:
1. determine the electric power loop of shorted to earth on circuit board, as shown in Figure 2; By the instrument (as universal instrument) of energy measuring resistance, measure power output end to the resistance of zone network, if resistance is 0 Ω or much smaller than load resistance, be that power supply is directly connected and formed closed-loop path with ground by wire without overload, conclude this electric power loop short circuit; Having there is short trouble in the capacitor C of having given an example in Fig. 31, needn't know the particular location of short circuit in practical operation, and this is the advantage of the method just;
2. dismantle the corresponding power supply chip in loop (non-transformer chip can be skipped this step) of lower shorted to earth;
3. get all adjustable DC power supply (general laboratory DC stable power supply of an electric current, voltage, as DC0～30V/3A power supply), electric current is adjusted to 0 ampere of position of minimum shelves, voltage is adjusted to the position of short-circuit loop rated operational voltage, and (load rating operating voltage as corresponding in short-circuit loop is 3.3V, supply voltage is adjusted to 3.3V position), connect the power supply that mixes up and provide rated voltage for this short-circuit loop;
4. rotate DC power supply current knob, the supply current that makes this short-circuit loop progressively increases with the stepping of 0.01A, utilize short dot resistance little, by the large characteristic of current in the short, according to Joule law, the heat that electric current produces by conductor is directly proportional with the quadratic power of electric current, follows the resistance of conductor to be directly proportional, time with energising is directly proportional, and short dot temperature will increase gradually and reach scolding tin fusing point and fused; The current value of DC power supply indication sharply diminishes and finally remains unchanged, and shows that the scolding tin in shorted pins fuses, and short trouble is successfully got rid of; As shown in Figure 4.
Operation principle
The invention provides a kind of short-circuit fault of circuit board restorative procedure of overcurrent Fuse Type.The method, without finding out shorted pins definite on circuit board, is directly used the principle of overcurrent tin silk fusing, forces the scolding tin fusing of short dot, thereby short trouble is got rid of, so can repair rapidly the circuit board being short-circuited.
Detect the method for shorted to earth: the electric power loop of determining shorted to earth on circuit board, by the instrument (as universal instrument) of energy measuring resistance, measure power output end to the resistance of zone network, if resistance is 0 Ω or much smaller than load resistance, be that power supply is directly connected and formed closed-loop path with ground by wire without overload, conclude this electric power loop short circuit.After making circuit board and completing and complete with paster, all will carry out flying probe, if circuit board short circuit before paster, check circuit plate file, if circuit board short circuit after paster is defined as components and parts pin or device damage itself and causes short circuit.
Repair step:
1. dismantle the corresponding power supply chip in loop (non-transformer chip can be skipped this step) of lower shorted to earth: for preventing that the DC power supply electric current backflow providing in the 2nd step from damaging power supply chip;
2. get all adjustable DC power supply (general laboratory DC stable power supply of an electric current, voltage, as DC0～30V/3A power supply), electric current is adjusted to 0 ampere of position of minimum shelves, voltage is adjusted to the position of short-circuit loop rated operational voltage, and (load rating operating voltage as corresponding in short-circuit loop is 3.3V, supply voltage is adjusted to 3.3V position), connect the power supply that mixes up and provide rated voltage for this short-circuit loop; Required rated voltage when this loop works is generally provided, if the power that short dot consumes is excessive, within the scope of the ceiling voltage of allowing at this loop device (components and parts data has the explanation of maximum working voltage), suitably improve supply voltage or extend conduction time;
3. rotate DC power supply current knob, the supply current that makes this short-circuit loop progressively increases with the stepping of 0.01A, utilize short dot resistance little, by the large characteristic of current in the short, according to Joule law, the heat that electric current produces by conductor is directly proportional with the quadratic power of electric current, follows the resistance of conductor to be directly proportional, time with energising is directly proportional, and short dot temperature will increase gradually and reach scolding tin fusing point and fused; The current value of DC power supply indication sharply diminishes and finally remains unchanged, and shows that the scolding tin in shorted pins fuses, and short trouble is successfully got rid of; For device itself, damage the short circuit causing, as power tube punctures, according to circuit board local pyrexia situation, carry out short circuit locking, replace short circuit device.
Embodiment:
Suppose: circuit board A has 3 road electric power loops, power supply is direct current 12V/5A, the power supply that converts direct current 5V/3A through power supply chip LM22676-5.0 to is individual devices power supply on data processing and logic control chip periphery module and plate, and the power supply that converts direct current 3.3V/0.8A through power supply chip LM1117-3.3 to is data processing and the power supply of logic control chip core.
Detection method:
1. with universal instrument, measure the resistance of 12V electric power loop: the anodal pin that records power input socket is 620 Ω to the resistance of zone network (the negative pole pin of socket);
2. with universal instrument, measure the resistance of 5V electric power loop: recording power supply chip LM22676-5.0 output pin is 710 Ω to the resistance of zone network;
3. with universal instrument, measure the resistance of 3.3V electric power loop: recording power supply chip LM1117-3.3 output pin is 0.2 Ω to the resistance of zone network;
In process, planar survey is found, the resistance of 3.3V electric power loop is far smaller than load resistance, is defined as short-circuit loop.If now short dot do not repaired and directly inputted 12V power supply, can cause part of devices to damage.
Repair step:
1. dismantle the power supply chip LM1117-3.3 of lower 3.3V electric power loop;
2. get all adjustable DC power supply (general laboratory DC stable power supply of an electric current, voltage, as DC0～30V/3A power supply), electric current is adjusted to 0 ampere of position of minimum shelves, voltage is adjusted to short-circuit loop rated operational voltage 3.3V position, and the power supply mixing up from board pads input corresponding to power supply chip LM1117-3.3 output pin is short-circuit loop power supply;
3. rotate DC power supply current knob, the supply current that makes this short-circuit loop progressively increases with the stepping of 0.01A, the current value of DC power supply indication increases to 2.6A gradually by 0A, sharply drop to afterwards 0.1A and remain unchanged, show that the scolding tin in shorted pins fuses, short trouble is successfully got rid of.
4., after short-circuit bar removes, the power supply chip LM1117-3.3 circuit board of burn-oning under dismounting just can normally be used.
Claims (3)
1. a short-circuit fault of circuit board restorative procedure for overcurrent Fuse Type, is characterized in that comprising without finding out shorted pins definite on circuit board, and directly uses the mode of overcurrent tin silk fusing, forces the scolding tin fusing of short dot, thereby short trouble is got rid of; Specifically comprise the following steps:
A. determine the electric power loop of shorted to earth on circuit board; By instrument that can measuring resistance, measure power output end to the resistance of zone network, if resistance is 0 Ω or much smaller than load resistance, power supply directly forms closed-loop path by wire and ground connection without overload, concludes this electric power loop short circuit;
B. dismantle the corresponding power supply chip in loop of lower shorted to earth, non-transformer chip can be skipped this step;
C. get all adjustable DC power supply of an electric current, voltage, electric current is adjusted to 0 ampere of position of minimum shelves, voltage is adjusted to the position of short-circuit loop rated operational voltage, connect the power supply that mixes up and provide rated voltage for this short-circuit loop;
D. rotate DC power supply current knob, the supply current of this short-circuit loop is progressively increased, utilize short dot resistance little, by the large characteristic of current in the short, according to Joule law, the heat that electric current produces by conductor is directly proportional with the quadratic power of electric current, follows the resistance of conductor to be directly proportional, time with energising is directly proportional, and short dot temperature will increase gradually and reach scolding tin fusing point and fused; The current value of DC power supply indication sharply diminishes and finally remains unchanged, and shows that the scolding tin in shorted pins fuses, and short trouble is got rid of.
2. the short-circuit fault of circuit board restorative procedure of overcurrent Fuse Type as claimed in claim 1, makes the supply current of this short-circuit loop progressively increase the stepping comprising with 0.01A described in it is characterized in that.
3. the short-circuit fault of circuit board restorative procedure of overcurrent Fuse Type as claimed in claim 1, is characterized in that the instrument of described energy measuring resistance comprises universal instrument.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110164594.6A CN102361536B (en) | 2011-06-17 | 2011-06-17 | Rapid detection and restoration method for short-circuit fault of circuit board |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110164594.6A CN102361536B (en) | 2011-06-17 | 2011-06-17 | Rapid detection and restoration method for short-circuit fault of circuit board |
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| CN102361536A CN102361536A (en) | 2012-02-22 |
| CN102361536B true CN102361536B (en) | 2014-09-24 |
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| CN201110164594.6A Expired - Fee Related CN102361536B (en) | 2011-06-17 | 2011-06-17 | Rapid detection and restoration method for short-circuit fault of circuit board |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6343201B2 (en) * | 2014-08-04 | 2018-06-13 | デクセリアルズ株式会社 | Short circuit element |
| CN105188009B (en) * | 2015-08-31 | 2018-10-30 | 武汉科技大学 | A kind of earphone wire short circuit is automatic to be detected and restorative procedure and device |
| CN105425094B (en) * | 2015-11-24 | 2018-04-27 | 深圳怡化电脑股份有限公司 | A kind of PCBA short dots detection method and device |
| US10531562B2 (en) | 2017-05-31 | 2020-01-07 | International Business Machines Corporation | Heat-activated conductive spinel materials for printed circuit board via overcurrent protection |
| CN110896596A (en) * | 2018-09-12 | 2020-03-20 | 长鑫存储技术有限公司 | Short circuit node repairing method based on circuit board |
| CN109639107B (en) * | 2018-11-29 | 2023-12-12 | 广州金升阳科技有限公司 | Power module maintenance device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1405940A (en) * | 2002-10-31 | 2003-03-26 | 上海新茂半导体有限公司 | Over-voltage over-current protection circuit |
| CN101923997A (en) * | 2009-06-16 | 2010-12-22 | 上海电器陶瓷厂有限公司 | Fuse link for low voltage fuse |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02301191A (en) * | 1989-05-15 | 1990-12-13 | Fujitsu Ltd | Printed circuit board unit |
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2011
- 2011-06-17 CN CN201110164594.6A patent/CN102361536B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1405940A (en) * | 2002-10-31 | 2003-03-26 | 上海新茂半导体有限公司 | Over-voltage over-current protection circuit |
| CN101923997A (en) * | 2009-06-16 | 2010-12-22 | 上海电器陶瓷厂有限公司 | Fuse link for low voltage fuse |
Non-Patent Citations (1)
| Title |
|---|
| JP平2-301191A 1990.12.13 |
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Address after: Futian District Jintian road Shenzhen City, Guangdong province 518000 No. 4018 Allianz building 27 floor A02 Applicant after: Shenzhen Yihua Computer Co., Ltd. Applicant after: Shenzhen Yihua Time Technology Co., Ltd. Applicant after: Shenzhen Yihua Financial Intelligent Research Institute Address before: Futian District Jintian road Shenzhen City, Guangdong province 518000 No. 4018 Allianz building 27 floor A02 Applicant before: Shenzhen Yihua Computer Ltd. Applicant before: Shenzhen Yihua Time Technology Co., Ltd. Applicant before: Shenzhen Yihua Financial Intelligent Research Institute |
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