CN107728041B - Electronic circuit board electric property detection device - Google Patents
Electronic circuit board electric property detection device Download PDFInfo
- Publication number
- CN107728041B CN107728041B CN201710940783.5A CN201710940783A CN107728041B CN 107728041 B CN107728041 B CN 107728041B CN 201710940783 A CN201710940783 A CN 201710940783A CN 107728041 B CN107728041 B CN 107728041B
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- probe
- circuit board
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- motor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/2806—Apparatus therefor, e.g. test stations, drivers, analysers, conveyors
- G01R31/2808—Holding, conveying or contacting devices, e.g. test adapters, edge connectors, extender boards
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/2801—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP]
- G01R31/2818—Testing of printed circuits, backplanes, motherboards, hybrid circuits or carriers for multichip packages [MCP] using test structures on, or modifications of, the card under test, made for the purpose of testing, e.g. additional components or connectors
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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
- Tests Of Electronic Circuits (AREA)
Abstract
The invention discloses an electronic circuit board electrical performance detection device, which comprises a plurality of probes fixed on a substrate through a motor base, wherein each probe comprises a pushing mechanism at the bottom and a detection mechanism at the top; the pushing mechanism comprises a linear motor, a circular tray is arranged at the top end of a push rod of the motor, a guide post is fixed in the center of the tray, and a spring is nested on the guide post; a probe seat is fixed at the top end of the spring, and a probe is led out from the center of the top of the probe seat upwards; a penetrating slender pipeline is formed in the centers of the tops of the probe seat and the insulating shell outside the guide column, and the probe penetrates out of the pipeline; the base plate is connected with a control panel, and the control panel is provided with an FPGA, a motor driving module, an ADC module and an RS232 interface module for connecting a PC. Compared with the traditional method relying on manual detection, the method has the advantages of high efficiency, good stability and convenient batch operation, can effectively prevent missed detection and false detection, and can realize recording and statistics to ensure that the detection process of each circuit board can be traced.
Description
Technical Field
The invention relates to a detection device, in particular to an electronic circuit board electric performance detection device.
Background
At the present stage, in the batch production of the electronic circuit board, the chip mounting work is generally completed by a chip mounter, and compared with manual welding, the precision and the efficiency of the chip mounter are greatly improved. However, in practical use, the problem of poor welding is difficult to avoid. Therefore, the circuit board pasted by the chip mounter cannot be directly installed in the product, and if the debugging of the whole product is in a problem, the machine needs to be dismounted and the circuit board needs to be repaired, so that the waste of manpower is caused.
Generally, a processing plant performs all or sampling detection on a circuit board before a product is completely assembled, and accordingly, test points are often added in a key signal network in the design of the circuit board.
The basic principle of circuit board test is ohm's law, and its test method is to electrify the circuit board, let the circuit on the circuit board run, select the point to be tested on the circuit board, obtain the voltage signal of the point, through the voltage comparison circuit, test the potential difference between the point and the reference point, and compare with the standard value. And sequentially testing the potential difference between each test point and the reference point on the whole circuit board, and if all potential difference values meet the threshold range of the standard value, determining that the quality of the circuit board reaches the standard.
Above-mentioned test process is generally accomplished by the manual work, and this process is more tedious loaded down with trivial details, belongs to simple repeated work, and in the actual operation, the easy appearance is leaked and is examined, the wrong detection scheduling problem, and this process efficiency is lower moreover, all can produce the influence to whole production efficiency, if accelerate the progress, must arrange a plurality of workman again and inspect simultaneously. Therefore, it is necessary to design an apparatus for detecting electrical performance of an electronic circuit board, so as to implement high-efficiency and high-accuracy quality detection on a batch of electronic circuit boards.
Disclosure of Invention
The invention provides a device for detecting the electrical performance of an electronic circuit board, aiming at solving the problems.
The invention is implemented according to the following technical scheme.
An electric performance detection device of an electronic circuit board comprises a base, wherein a support perpendicular to the base is arranged on the base, and a bracket parallel to the base is fixed on the support; the device comprises a plurality of probes fixed on a substrate through a motor base, wherein each probe comprises a pushing mechanism at the bottom and a detecting mechanism at the top; the pushing mechanism comprises a linear motor, and a positioning hole is formed in the outer side wall of the linear motor; the linear motor drives the push rod to reciprocate, a round tray is arranged at the top end of the push rod, a guide post is fixed at the center of the round tray, a spring is nested on the guide post, the bottom end of the spring is connected with a second cable through a lead arranged in the round tray, and the other end of the second cable is connected with a first connector on the substrate through a wiring terminal; a probe seat is fixed at the top end of the spring, the bottom of the probe seat is hollow and cylindrical, the top of the probe seat retracts inwards, and a probe is led out from the center of the top of the probe seat upwards; the bottom end of the probe is connected with the top end of the spring through a metal conductor arranged in the probe seat; the probe seat covers the top end of the guide post; an insulating shell is arranged outside the probe seat and the guide column, the insulating shell body is cylindrical, the upper part of the insulating shell body is inwards retracted to form a conical top, a penetrating long and thin pipeline is formed in the center of the top, and the probe penetrates out of the pipeline; a circular hole for placing the linear motor is formed in the center of the linear motor base, two limiting clamping grooves are formed on the periphery of the linear motor base, a plurality of fixing pins are arranged at the bottom of the linear motor base, and the fixing pins penetrate through the pad holes in the substrate and are welded and fixed on the substrate; the screw penetrates through the side wall of the motor base, the tail end of the screw is embedded into the positioning hole, and the linear motor is fixed on the motor base; the substrate is also provided with a second connector, and the control panel is inserted in the second connector; the control panel is provided with a control circuit which takes the FPGA as a core, and the control circuit also comprises a motor driving module, an ADC module and an RS232 interface module which are connected with the FPGA; the second connector is connected with the plurality of first connectors through a transmission line formed by copper-clad on the substrate; two layers of brackets are fixed on the bracket, and a plurality of raised positioning columns are formed on the brackets; the substrate is fixed below the bracket at the top layer, and the circuit board to be detected is fixed above the bracket at the bottom layer.
And a public ground wire is connected between the substrate and the circuit board.
A first cable is led out of the linear motor and used for transmitting a linear motor driving signal, and the tail end of the first cable and a second cable share a wiring terminal to be connected with a first connector.
The base plate is a printed circuit board, the base plate is further provided with an RS232 interface seat and a power supply module, and the RS232 interface seat is connected with the PC through serial port lines.
The second connector is a PCI slot or a PCIE slot.
The guide post is made of ceramic materials; the insulating shell and the probe seat are made of ABS engineering plastics.
The probe body is made of alloy materials, and the surface of the probe body is plated with gold.
The present invention obtains the following advantageous effects.
The invention provides an electronic circuit board electrical performance detection device, which designs a probe and other auxiliary equipment which are convenient for realizing the electronic circuit board electrical performance detection, wherein the probe is provided with a substrate aiming at different circuit boards to be detected in a customized mode, the top of the probe is provided with a probe, the probe is connected with a detection module of a control circuit, the probe extends outwards under the driving of a linear motor, and the probe is contacted with a test point on the circuit board to be detected, so that the voltage of the point can be transmitted to the detection module. When a plurality of probes act simultaneously, the electronic circuit board can be efficiently detected in batches. Compared with the traditional method relying on manual detection, the method has the advantages of high efficiency, good stability, convenient batch operation, effective prevention of missed detection and false detection, and realization of recording and statistics, so that the detection process of each circuit board can be traced.
Drawings
FIG. 1 is a schematic view of the structure of a probe according to the present invention;
FIG. 2 is a schematic view of the internal structure of the probing mechanism of the present invention (probe not compressed);
FIG. 3 is a schematic view of the internal structure of the probing mechanism (probe pressed) in the present invention;
FIG. 4 is a bottom view of the base plate of the present invention secured to the bracket;
FIG. 5 is a schematic view of the construction of the bracket of the present invention;
FIG. 6 is a schematic view of the structure of the motor base of the present invention;
FIG. 7 is a top view of the linear motor of the present invention mounted in a motor mount;
FIG. 8 is a front view of the present invention;
fig. 9 is a block diagram of a control circuit according to the present invention.
Wherein, 1, a substrate; 101. a first connector; 102. a second connector; 2. a bracket; 3. a probe; 301. a linear motor; 302. positioning holes; 303. a first cable; 304. a second cable; 305. a circular tray; 306. a spring; 307. a probe base; 308. a guide post; 309. a probe; 310. an insulating housing; 311. a motor base; 312. a fixing leg; 313. a wiring terminal; 4. a base; 5. a support; 6. and (5) detecting the circuit board to be detected.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
As shown in fig. 1 to 9, an electrical performance testing apparatus for an electronic circuit board comprises a base 4, a support 5 perpendicular to the base 4 is arranged on the base 4, and a bracket 2 parallel to the base 4 is fixed on the support 5; the device comprises a plurality of probes 3 fixed on a substrate 1 through a motor base 311, wherein each probe 3 comprises a pushing mechanism at the bottom and a detecting mechanism at the top; the pushing mechanism comprises a linear motor 301, and a positioning hole 302 is formed in the outer side wall of the linear motor 301; the linear motor 301 drives the push rod to reciprocate, a circular tray 305 is arranged at the top end of the push rod, a guide column 308 is fixed at the center of the circular tray 305, a spring 306 is nested on the guide column 308, the bottom end of the spring 306 is connected with a second cable 304 through a lead arranged in the circular tray 305, and the other end of the second cable 304 is connected with the first connector 101 on the substrate 1 through a wiring terminal 313; a probe seat 307 is fixed at the top end of the spring 306, the bottom of the probe seat 307 is hollow and cylindrical, the top of the probe seat retracts inwards, and a probe 309 is led out from the center of the top of the probe seat upwards; the bottom end of the probe 309 is connected with the top end of the spring 306 through a metal conductor arranged in the probe seat 307; the probe base 307 covers the top end of the guide column 308; an insulating shell 310 is arranged outside the probe seat 307 and the guide column 308, the insulating shell 310 body is cylindrical, the upper part of the insulating shell 310 body is inwards retracted to form a conical top, a through long and thin pipeline is formed in the center of the top, and the probe 309 penetrates out of the pipeline; a round hole for placing the linear motor 301 is formed in the center of the motor base 311, two limiting clamping grooves are formed on the periphery of the motor base, a plurality of fixing pins 312 are arranged at the bottom of the motor base, and the fixing pins 312 penetrate through the pad holes on the substrate 1 and are welded and fixed on the substrate 1; the screw penetrates through the side wall of the motor base 311, the tail end of the screw is embedded into the positioning hole 302, and the linear motor 301 is fixed on the motor base 311; the substrate 1 is also provided with a second connector 102, and the control panel is inserted in the second connector 102; the control panel is provided with a control circuit which takes the FPGA as a core, and the control circuit also comprises a motor driving module, an ADC module and an RS232 interface module which are connected with the FPGA; the second connector 102 is connected to the plurality of first connectors 101 through a transmission line formed of copper clad on the substrate 1; two layers of brackets 2 are fixed on the bracket 5, and a plurality of raised positioning columns are formed on the brackets 2; the substrate 1 is fixed below the bracket 2 at the top layer, and the circuit board 6 to be detected is fixed above the bracket 2 at the bottom layer.
A common ground is connected between the substrate 1 and the circuit board 6.
A first cable 303 is externally led out of the linear motor 301 for transmitting a driving signal of the linear motor 301, and the tail end of the first cable 303 and a common connection terminal 313 of a second cable 304 are connected with the first connector 101.
The base plate 1 is a printed circuit board, an RS232 interface seat and a power module are further arranged on the base plate 1, and the RS232 interface seat is connected with a PC through serial port lines.
The second connector 102 is a PCI slot or a PCIE slot.
The guide posts 308 are made of ceramic; the insulating housing 310 and the probe seat 307 are made of ABS engineering plastic.
The probe 309 is made of alloy material, and the surface is plated with gold.
The principle and the using method of the invention are as follows:
the substrate 1 is a printed circuit board, is designed according to the circuit board 6 to be detected in a customized mode, has a size specification basically consistent with that of the circuit board 6 to be detected, is provided with a plurality of positions for placing the motor bases 311, the number of the motor bases 311 is consistent with that of the test points on the circuit board 6 to be detected, and the position of each motor base 311 is correspondingly consistent with that of the test points on the circuit board 6 to be detected. Calculation is performed at the beginning of the design, so that after the probe 3 is installed, the top end of the probe 309 faces the test point on the circuit board 6 to be tested.
The bracket 2 is used for fixing and supporting the substrate 1 and the circuit board 6 to be detected, and when the substrate 1 is designed, a vacant position is reserved according to the specific position of the positioning column on the bracket 2, so that the positioning column is embedded in the vacant position, and the substrate 1 is prevented from sliding relatively on the bracket 2 to cause deviation of the pointing direction of the probe 309. As shown in fig. 5, a plurality of reinforcing beams are formed on the bracket 2 in the horizontal and vertical directions for supporting the substrate 1 and the circuit board 6 to be tested, so as to prevent bending deformation and also prevent deviation of the orientation of the probe 309.
As shown in fig. 8, the substrate 1 and the board 6 to be inspected are mounted on the stand 5, the control board is inserted into the second connector 102, the PC and the substrate 1 are connected by a serial line, and the power supply of the substrate 1 is turned on. And sending a control command to the FPGA through upper computer software, wherein the control command comprises a motor driving command and a signal detection command.
And a microcontroller soft core in the FPGA analyzes the control command. If the motor driving command is received, the corresponding linear motor 301 is driven to act, the state of the detection mechanism on the upper part of the probe 3 is shown in fig. 2, when the push rod extends outwards to push the detection mechanism to move, the probe 309 gradually approaches to the test point on the detection circuit board 6 and finally touches the test point, the linear motor 301 continues to push the push rod outwards, but the probe 309 is blocked, so the spring 306 is compressed, and the state of the detection mechanism is shown in fig. 3; thereby ensuring that the probes 309 are in full contact with the test points and avoiding the occurrence of poor contact.
The probe 309, the spring 306 and the second cable 304 are connected to form a conductive path through the probe seat 307 and a conductor inside the circular tray 305, and simultaneously form a complete electrical signal loop together with the signal ground on the substrate 1 and the circuit board 6 to be detected and a common ground wire between the substrate 1 and the circuit board 6 to be detected.
When the substrate 1 is designed, a connection line is designed according to the signal type (digital signal/analog signal) of a signal point to be detected, the control board is fixed, namely, the line sequence of the second connector 102 is fixed, some signal pins are directly connected to the FPGA and can be used for detecting digital signals, some signal pins are connected with the ADC chip and can be used for detecting analog signals, and the FPGA acquires signal voltage by reading the output of the ADC.
An operator sends a motor driving command and a signal detection command in sequence through upper computer software of the PC, the FPGA detects signal voltage, the voltage value is sent to the PC through a serial port, the operator reads the voltage value in the upper computer software, and the difference between the real-time voltage value and a standard reference value can be visually checked and compared by utilizing a human-computer interface of the PC. Therefore, even if a plurality of test points exist, whether the test points can meet the requirements can be quickly judged. Digital sampling of the FPGA and analog quantity detection of the ADC are both in millisecond level, and the multi-channel parallel processing capability is good, so that the time consumption of the whole detection process is in millisecond level, and the efficiency is greatly improved.
Claims (7)
1. An electronic circuit board electric performance detection device comprises a base (4), wherein a support (5) perpendicular to the base (4) is arranged on the base (4), and a bracket (2) parallel to the base (4) is fixed on the support (5); the device is characterized by further comprising a plurality of probes (3) which are fixed on the substrate (1) through a motor base (311), wherein each probe (3) comprises a pushing mechanism at the bottom and a detecting mechanism at the top; the pushing mechanism comprises a linear motor (301), and a positioning hole (302) is formed in the outer side wall of the linear motor (301); the linear motor (301) drives the push rod to reciprocate, a circular tray (305) is arranged at the top end of the push rod, a guide post (308) is fixed at the center of the circular tray (305), a spring (306) is nested on the guide post (308), the bottom end of the spring (306) is connected with a second cable (304) through a lead arranged in the circular tray (305), and the other end of the second cable (304) is connected with a first connector (101) positioned on the substrate (1) through a wiring terminal (313); a probe seat (307) is fixed at the top end of the spring (306), the bottom of the probe seat (307) is hollow and cylindrical, the top of the probe seat retracts inwards, and a probe (309) is led out from the center of the top of the probe seat upwards; the bottom end of the probe (309) is connected with the top end of the spring (306) through a metal conductor arranged in a probe seat (307); the probe seat (307) covers the top end of the guide column (308); an insulating shell (310) is arranged outside the probe seat (307) and the guide column (308), the body of the insulating shell (310) is cylindrical, the upper part of the body is inwards retracted to form a conical top, a through slender pipeline is formed in the center of the top, and the probe (309) penetrates out of the pipeline; a round hole for placing the linear motor (301) is formed in the center of the motor base (311), two limiting clamping grooves are formed in the periphery of the motor base, a plurality of fixing pins (312) are arranged at the bottom of the motor base, and the fixing pins (312) penetrate through the pad holes in the substrate (1) and are welded and fixed on the substrate (1); the screw penetrates through the side wall of the motor base (311), the tail end of the screw is embedded into the positioning hole (302), and the linear motor (301) is fixed on the motor base (311); the substrate (1) is also provided with a second connector (102), and the control panel is inserted into the second connector (102); the control panel is provided with a control circuit which takes the FPGA as a core, and the control circuit also comprises a motor driving module, an ADC module and an RS232 interface module which are connected with the FPGA; the second connector (102) is connected with the plurality of first connectors (101) through a transmission line formed by copper-clad on the substrate (1); two layers of brackets (2) are fixed on the support (5), and a plurality of raised positioning columns are formed on the brackets (2); the base plate (1) is fixed below the bracket (2) at the top layer, the circuit board (6) to be detected is fixed above the bracket (2) at the bottom layer, the base plate (1) is also provided with an RS232 interface seat and a power supply module, the RS232 interface seat is connected with a PC through a serial port line, upper computer software of the PC is operated to send a motor driving command and a signal detection command in sequence, the FPGA detects signal voltage, the voltage value is sent to the PC through a serial port, the voltage value is read in the upper computer software, a man-machine interface of the PC is utilized to check and compare the difference between the real-time voltage value and a standard reference value, so that whether the requirement can be met can be quickly judged even if a plurality of test points exist, the digital sampling of the FPGA and the analog quantity detection of the ADC are all in millisecond level, and the multi-channel parallel processing capability is good, therefore, the time consumption of the whole detection process is in millisecond level, the efficiency is greatly improved.
2. An electronic circuit board electrical performance testing device according to claim 1, characterized in that a common ground is connected between said substrate (1) and said circuit board (6).
3. The electrical performance testing device of the electronic circuit board as claimed in claim 1, wherein a first cable (303) is externally led out from said linear motor (301) for transmitting a driving signal of the linear motor (301), and the end of the first cable (303) is connected to the first connector (101) through a terminal (313) shared by the second cable (304).
4. An electronic circuit board electrical performance testing device according to claim 1, characterized in that said substrate (1) is a printed wiring board.
5. The electronic circuit board electrical performance testing apparatus of claim 1, wherein said second connector (102) is a PCI slot or a PCIE slot.
6. The electrical performance testing device of claim 1, wherein said guide posts (308) are ceramic; the insulating shell (310) and the probe seat (307) are made of ABS engineering plastics.
7. The electrical performance testing device of an electronic circuit board as claimed in claim 1, wherein said probe (309) body is made of alloy and has a gold-plated surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710940783.5A CN107728041B (en) | 2017-10-11 | 2017-10-11 | Electronic circuit board electric property detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710940783.5A CN107728041B (en) | 2017-10-11 | 2017-10-11 | Electronic circuit board electric property detection device |
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| Publication Number | Publication Date |
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| CN107728041A CN107728041A (en) | 2018-02-23 |
| CN107728041B true CN107728041B (en) | 2021-12-03 |
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| CN201710940783.5A Active CN107728041B (en) | 2017-10-11 | 2017-10-11 | Electronic circuit board electric property detection device |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112327054B (en) * | 2020-10-10 | 2024-05-10 | 杭州松泰电力科技有限公司 | Transformer direct current resistance tester with high safety |
| CN112730927A (en) * | 2020-12-29 | 2021-04-30 | 北京纬百科技有限公司 | Testing device |
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| CA2174784C (en) * | 1996-04-23 | 1999-07-13 | George Guozhen Zhong | Automatic multi-probe pwb tester |
| CN201041603Y (en) * | 2007-04-13 | 2008-03-26 | 高创(苏州)电子有限公司 | LCD circuit board function tester |
| CN201716340U (en) * | 2009-04-13 | 2011-01-19 | 环旭电子股份有限公司 | Probe device |
| KR101057371B1 (en) * | 2009-07-03 | 2011-08-17 | 리노공업주식회사 | Inspection probe |
| JP2011158454A (en) * | 2010-02-01 | 2011-08-18 | Internet Kk | Contact probe |
| CN202110235U (en) * | 2011-06-15 | 2012-01-11 | 上海山泰柯电子有限公司 | Device for detecting on and off of electric circuit board |
| CN103913642A (en) * | 2013-01-08 | 2014-07-09 | 鸿富锦精密工业（深圳）有限公司 | Signal testing device |
| CN103274261A (en) * | 2013-06-18 | 2013-09-04 | 海宁市盛祥线业有限公司 | Expansion mechanism of yarn guide rod in separating and winding machine with spools |
| CN203673034U (en) * | 2013-11-27 | 2014-06-25 | 中国航天科技集团公司第五研究院第五一三研究所 | Self-adjusting multipoint fault injection device |
| CN103926325B (en) * | 2014-04-18 | 2017-12-15 | 上汽通用五菱汽车股份有限公司 | A kind of Multi probe flexible clamping device applied to ultrasound examination |
| CN204129132U (en) * | 2014-09-18 | 2015-01-28 | 中山市智牛电子有限公司 | A kind of frock tester detecting 090-590000-10TV board |
| CN104777417A (en) * | 2015-05-05 | 2015-07-15 | 常州信息职业技术学院 | Modular PCB testing jig |
| CN105096783A (en) * | 2015-08-03 | 2015-11-25 | 武汉华星光电技术有限公司 | Detection equipment and probe component thereof |
| CN205826998U (en) * | 2016-04-28 | 2016-12-21 | Tcl显示科技（惠州）有限公司 | LCM test device |
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Effective date of registration: 20211115 Address after: 516000 group, Pushang village, Longxi street, BOLUO County, Huizhou City, Guangdong Province Applicant after: Huizhou jinpusheng Electronic Technology Co., Ltd Address before: 266109 No. 700, Changcheng Road, Chengyang District, Qingdao City, Shandong Province Applicant before: He man Li |
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