CN110940908A

CN110940908A - Multi-connection testing method for PCB (printed circuit board) of small electric appliance and special equipment

Info

Publication number: CN110940908A
Application number: CN201910711903.3A
Authority: CN
Inventors: 蔡达伟; 张宣东; 章幼路
Original assignee: Zhuhai Future Electronic Technology Co Ltd
Current assignee: Zhuhai Future Electronic Technology Co Ltd
Priority date: 2019-08-02
Filing date: 2019-08-02
Publication date: 2020-03-31

Abstract

The invention discloses a multiple testing method for a PCB (printed circuit board) of a small electric appliance, which comprises the following steps of: s1, arranging a special detection device, and contacting the multi-connected small electric appliance PCB circuit board test point to be tested with a top surface thimble of the special detection device; s2, starting special equipment, powering on the multi-connected PCB simultaneously, and detecting input and output parameters of the circuit; s3, enabling the serial number and the position displayed by the LCD display screen on the special equipment to correspond to the serial number and the position of the detected multi-connected small electric appliance PCB; s4, detecting by using a program and a step built in the special equipment; and S5, respectively detecting the single unqualified small electric appliance PCBs on the corresponding serial numbers and positions, and splitting and warehousing other qualified small electric appliance PCBs. The invention also discloses special equipment for implementing the method, and the top surface of the circuit board is respectively provided with a CPU control chip, a touch chip and a photoelectric sensor. The invention can detect the 12-linked PCB at one time, and improves the detection efficiency and accuracy.

Description

Multi-connection testing method for PCB (printed circuit board) of small electric appliance and special equipment

Technical Field

The invention relates to the technical field of PCB (printed circuit board) testing, in particular to a multi-connection testing method for a PCB of a small electric appliance, and also relates to special equipment for the multi-connection testing of the PCB of the small electric appliance.

Background

Printed circuit boards, also known as PCBs, are providers of electrical connections for electronic components. Its development has been over 100 years old; the design of the method is mainly layout design; the circuit board has the main advantages that wiring and assembly errors are greatly reduced, and the automation level and the production labor rate are improved; the circuit board can be divided into a single-sided board, a double-sided board, a four-layer board, a six-layer board and other multi-layer circuit boards according to the number of the layers of the circuit board; since printed circuit boards are not typical end products, they are somewhat confusing in the definition of names such as: the motherboard for a personal computer is called a motherboard and cannot be directly called a circuit board, and although the circuit board exists in the motherboard, the motherboard is different from the motherboard, so that the two aspects cannot be said to be the same when evaluating the industry. For another example: because of the integrated circuit components mounted on the circuit board, the news media is called an IC board, but it is not substantially identical to a printed circuit board. By printed circuit board we generally say bare board-i.e. a circuit board without upper components.

In the prior art, chinese patent application 201810066716.X discloses a PCB testing device, which includes a frame, a pressing plate assembly, a needle bed assembly and a control assembly, wherein the control assembly is used for controlling the movement of the pressing plate assembly and the needle bed assembly, and the PCB is placed between the pressing plate assembly and the needle bed assembly. The test device achieves the purpose of quickly updating or replacing the test device by replacing the two core components of the pressing plate and the needle bed, so that the test device is suitable for PCBs of different types, effectively adapts to quick updating and updating of the PCBs, and improves the universality and the practicability of the test device. Meanwhile, the pressing plate fixing plate and the needle bed fixing plate can slide out of the testing area, and replacement of the pressing plate and the needle bed is facilitated.

However, the detection process is single-piece and manual detection, which wastes time and labor, has low speed and low efficiency, and can not realize performance detection according to a plurality of preset steps so as to obtain an accurate result of the detected PCB fault.

Disclosure of Invention

The invention aims to provide a multi-connection testing method and special equipment for a PCB (printed circuit board) of a small electrical appliance, which can be used for detecting a 12-connection PCB at one time so as to improve the detection speed, can be used for detecting in steps, and has high detection efficiency and accurate result so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

a multi-connection test method for a PCB (printed circuit board) of a small electric appliance is characterized by comprising the following steps of:

s1, arranging a special detection device, and contacting the multi-connected small electric appliance PCB circuit board test point to be tested with a top surface thimble of the special detection device;

s2, starting special equipment, powering on the multi-connected PCB simultaneously, and detecting the performance, input and output parameters of the PCB circuit;

s3, enabling the serial number and the position displayed by the LCD display screen on the special equipment to correspond to the serial number and the position of the detected multi-connected small electric appliance PCB;

s4, detecting by a CPU control chip of the special equipment through a built-in program and steps, lighting a first indicator lamp meeting the test requirement in the PCB in each detection step, displaying green, and entering the next step; the second indicator light which does not pass is lightened, red is displayed, and the second indicator light is detected by a detector;

and S5, respectively detecting the single unqualified small electric appliance PCB at the corresponding serial number and position by the detection personnel according to the detection results displayed at each step and each position, and disassembling and warehousing other qualified small electric appliance PCBs.

The step S1 further includes the following steps:

s11, the special detection equipment is provided with an air pressure driving module, and when the module works, the multi-connected small electric appliance PCB circuit board test point to be tested is contacted with the top surface thimble of the special detection equipment; the special detection equipment is also provided with a photoelectric sensor for monitoring whether the PCB to be detected is in place;

the step S2 further includes the following steps:

and S21, starting special equipment, and when the multi-connected PCB to be tested is powered on, firstly connecting the analog load, and then outputting one of voltages DC2.1V, DC2.5V and DC2.9V to the multi-connected PCB or outputting the three voltages to the multi-connected PCB in sequence so as to detect the performance, input and output parameters of the PCB circuit.

The step S4 further includes the following steps:

and S41, when detecting by using the program and steps built in the special equipment, detecting the three steps of standby detection, function detection and charging detection, and synchronously detecting the current changes of the multi-connected PCB and the analog load by the CPU control chip so as to comprehensively judge the performance and parameters of the PCB.

A special device for multi-connection test of small electric appliance PCB circuit boards for implementing the method of claims 1-4, which comprises a shell, and is characterized in that: the upper surface of the shell is provided with a top surface, and the top surface is provided with a thimble; the shell in be equipped with: the device comprises an external AC power interface, an air pressure driving module, a control circuit board (13), a key switch/test switch, an AC/DC power conversion module, a simulation load, a PCB top surface to be tested and an LCD display screen, wherein the external AC power interface, the air pressure driving module, the key switch/test switch, the AC/DC power conversion module, the simulation load and the control circuit board are electrically connected in sequence; the air pressure driving module enables the testing point on the bottom surface of the PCB to be tested to be electrically contacted with the thimble on the top surface; the control circuit board is internally provided with a CPU control chip, and the control chip is internally provided with a test program.

The touch control circuit board is characterized in that a touch chip is installed on one side of a CPU control chip of the control circuit board, a photoelectric sensor is installed on one side of the touch chip, and the CPU control chip is electrically connected with the touch chip.

The utility model discloses a lamp box, including casing, top surface, first draw-in groove, thimble, the bilateral symmetry of dog installs the thimble, the bilateral symmetry of thimble is fixed with the rectangular block, the cavity has been seted up to the inside equidistance of rectangular block, the cavity be fixed with the spring, the end fixing of spring has the fixture block, the LCD display screen is installed to one side of rectangular block, first pilot lamp and second pilot lamp are installed to one side of LCD display screen.

And the end part of the clamping block is provided with a second clamping groove, and the depth of the second clamping groove is the same as that of the first clamping groove.

The heights of the first clamping groove, the second clamping groove and the ejector pin are in the same horizontal plane.

The ejector pins are provided with twelve groups, twelve groups of ejector pins are symmetrically arranged every six groups, and twelve groups of ejector pins are numbered from 1 to 12 in sequence through external arrangement.

Compared with the prior art, the invention has the beneficial effects that:

1. the detection method and the device provided by the invention adopt a multi-connected and step-divided detection mode, so that the serial number and the position displayed by the LCD display screen on the special equipment correspond to the serial number and the position of the detected multi-connected small electric appliance PCB, 12 or more multi-connected PCB can be tested at one time, and the problems of which PCB of which step occurs and the specific problems (performance and parameters) can be directly displayed, the detection is efficient, the result is accurate, the fault reason of the PCB can be accurately judged, and the existing detection method is greatly broken through.

2. According to the special equipment provided by the invention, the PCB to be detected is placed on the surfaces of the stop block and the first clamping groove and the second clamping groove on the surface of the clamping block, the clamping block can extrude and fix the PCB under the elastic action of the spring in the cavity, at the moment, the contact point on the surface of the PCB can be just in contact with the ejector pin on the top surface of the shell, at the moment, twelve groups of detection can be simultaneously carried out during detection due to the fact that the ejector pins are provided with twelve groups, the performance of the PCB is detected through the CPU control chip and the photoelectric sensor, the strength of manual detection is reduced, time and labor are saved, the detection speed is greatly increased, and the detection efficiency is improved.

Drawings

FIG. 1 is a schematic diagram of the structure of each module of the special equipment of the present invention;

FIG. 2 is a schematic diagram of a top view (partially sectioned) of the special apparatus of the present invention;

FIG. 3 is a schematic view of the external structure of the present invention;

fig. 4 is a sectional top view of the housing of the present invention.

In the figure: 1. a housing; 2. a stopper; 3. a first card slot; 4. a thimble; 5. a rectangular block; 6. a cavity; 7. a spring; 8. a clamping block; 9. an LCD display screen; 10. a first indicator light; 11. a second indicator light; 12. a second card slot; 13. a control circuit board; 14. a CPU control chip; 15. a touch chip; 16. a photosensor; 17. a standby storage battery; 18. and (7) a rubber pad.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 4, the multiple testing method for the PCB of the small electrical appliance provided by the embodiment of the present invention includes the following steps:

s1, arranging a special detection device, and contacting the multi-connected small electrical appliance PCB test point to be tested with the top surface thimble 4 of the special detection device;

the special detection equipment is provided with an air pressure driving module, and when the module works, the multi-connected small electric appliance PCB circuit board test point to be tested is contacted with a top surface thimble of the special detection equipment; the special detection equipment is also provided with a photoelectric sensor 16 for monitoring whether the PCB to be detected is in place;

starting special equipment, specifically, when a multi-connected PCB to be tested is powered on, firstly connecting a simulation load, and then outputting one of voltages DC2.1V, DC2.5V and DC2.9V to the multi-connected PCB or outputting the three voltages to the multi-connected PCB in sequence so as to detect test items such as the performance, input parameters and output parameters of the PCB circuit;

s4, the CPU control chip 14 of the special equipment detects through a built-in program and steps, a first indicator light which meets the test requirement in the PCB is lightened and displayed green in each detection step, and the next step is carried out; the second indicator light which does not pass is lightened, red is displayed, and the second indicator light is detected by a detector;

specifically, when the detection is carried out by using a program and steps built in the special equipment, the detection of the three steps of standby detection, function detection and charging detection is carried out respectively, and at the moment, the CPU control chip carries out synchronous detection on the current changes of the multi-connected PCB and the analog load respectively so as to comprehensively judge the performance and parameters of the PCB.

And S5, respectively detecting the single unqualified small electric appliance PCB at the corresponding serial number and position by the detection personnel according to the detection results displayed at each step and each position, and disassembling and warehousing other qualified small electric appliance PCBs to finish the detection.

The invention also provides special equipment for multi-connection test of the PCB of the small electrical appliance for implementing the detection method, which comprises a shell 1, wherein the upper surface of the shell 1 is provided with a top surface, and the top surface is provided with a thimble 4; the shell in be equipped with: the device comprises an external AC power interface, an air pressure driving module, a control circuit board 13, a key switch/test switch, an AC/DC power conversion module, a simulation load, a PCB top surface to be tested and an LCD display screen, wherein the external AC power interface, the air pressure driving module, the key switch/test switch, the AC/DC power conversion module, the simulation load and the control circuit board 13 are electrically connected in sequence; the air pressure driving module enables the testing point on the bottom surface of the PCB to be tested to be electrically contacted with the thimble 4 on the top surface; a CPU control chip 14 is arranged in the control circuit board 13, and a test program is arranged in the control chip 14.

A touch chip 15 is further arranged on one side of the CPU control chip 14 of the control circuit board 13, a photoelectric sensor 16 is arranged on one side of the touch chip 15, and the CPU control chip 14 is electrically connected with the touch chip 15 and the photoelectric sensor 16.

The utility model discloses a casing, including casing 1, top surface one side of casing 1 is fixed with dog 2, first draw-in groove 3 has been seted up to dog 2's top surface bilateral symmetry, thimble 4 is installed to dog 2's bilateral symmetry, thimble 4's bilateral symmetry is fixed with rectangular block 5, cavity 6 has been seted up to rectangular block 5's inside equidistance, cavity 6 is fixed with spring 7, spring 7's end fixing has fixture block 8, LCD display screen 9 is installed to one side of rectangular block 5, first pilot lamp 10 and second pilot lamp 11 are installed to one side of LCD display screen 9.

The end parts of the clamping blocks 8 are provided with second clamping grooves 12, and the depth of the second clamping grooves 12 is the same as that of the first clamping grooves 3.

The heights of the first clamping groove 3, the second clamping groove 12 and the ejector pin 4 are in the same horizontal plane.

Twelve groups of thimbles 4 are arranged, and twelve groups of thimbles 4 are symmetrically arranged for every six groups, and twelve groups of thimbles 4 are numbered from 1 to 12 in sequence through external arrangement.

A backup battery 17 is also installed on the side of the CPU control chip 14 opposite to the touch chip 15, and is used when the external power supply is unstable.

Above-mentioned design can make the more level that PCB circuit board placed, makes things convenient for the contact and the contact of thimble 4 on PCB circuit board surface, is convenient for detect.

Through the technical scheme, twelve groups of PCB circuit boards can be detected simultaneously, the detection speed is accelerated, and meanwhile, the detection efficiency and accuracy can be improved by testing in steps.

Through the technical scheme, the volume of the whole special device can be reduced, the special device is convenient to carry, and the special device is more flexible and convenient to use.

Preferably, the CPU control chip 14, the touch chip 15 and the photoelectric sensor 16 are all electrically connected to the battery 17, and the models of the touch chip 15 and the photoelectric sensor 16 are X2865 and PZ-g61p, respectively.

Through the technical scheme, the CPU control chip 14, the touch chip 15 and the photoelectric sensor 16 can be conveniently electrified to conveniently work normally, and the photoelectric sensor is used for sensing whether the PCB to be detected is in place.

The touch chip 15 refers in particular to a single-point or multi-point touch technology, and the application range is mobile phones, computers and the like; the touch chip usually supports a wide working voltage range, a high-resolution touch detection module and a special signal processing circuit are integrated inside the touch chip to ensure that the chip has sensitive automatic identification and tracking functions on environmental changes, and a special algorithm is built in the touch chip to meet the requirements of water resistance, interference resistance and the like. The most advanced touch chips in China are XC2861 series ICs, HETAI series ICs and the like, for example, which can meet the high experience requirements of users on stability, sensitivity, power consumption, response speed, water resistance, water-carrying operation, vibration resistance, electromagnetic interference resistance and the like in complex application and have combined functions of proximity detection, multistage sensitivity adjustment and the like;

the CPU control chip 14 is an ultra-large scale integrated circuit, and is an operation core and a control core of a computer. Its functions are mainly to interpret computer instructions and to process data in computer software. The CPU mainly comprises an Arithmetic Logic Unit (ALU), an ArithmeticlogicUnit, a controller, a cache memory and a bus for realizing data, control and state of connection among the ALU, the ArithmeticlogicUnit, the controller and the cache memory. It is called three core components of electronic computer together with internal memory and input/output device.

Preferably, the bottom of the housing 1 is adhered with four rubber pads 18 by glue, the four rubber pads 18 are arranged in four groups, and the four groups of rubber pads 18 are arranged in pairs and symmetrically.

Through above-mentioned technical scheme, can conveniently support professional equipment like this, prevent direct and ground contact, long-time use leads to inside to wet because the influence of weather.

Preferably, the first indicator light 10 and the second indicator light 11 are a green LED indicator light and a red LED indicator light, respectively.

Through the technical scheme, qualified products or unqualified products can be better distinguished through the extension difference of the first indicator light 10 and the second indicator light 11.

In summary, the following steps: according to the invention, the PCB to be detected is placed on the surfaces of the stop block 2 and the first clamping groove 3 and the second clamping groove 12 on the surface of the clamping block 8, the clamping block 8 can extrude and fix the PCB under the elastic action of the spring 7 in the cavity 6, the contact point on the surface of the PCB can be just in contact with the ejector pin 4 on the top surface of the shell 1, twelve groups of detection can be simultaneously carried out during detection due to the fact that the ejector pins 4 are provided with twelve groups, the performance and parameters of the PCB can be detected through the CPU control chip 14, the output voltage and the analog load, the strength of manual detection is reduced, time and labor are saved, the detection speed is greatly increased, and the efficiency of detection work is improved.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A multi-connection test method for a PCB (printed circuit board) of a small electric appliance is characterized by comprising the following steps of:

2. The multiple testing method for the small electric appliance PCB circuit board as claimed in claim 1, wherein the step S1 further comprises the following steps:

s11, the special detection equipment is provided with an air pressure driving module, and when the module works, the multi-connected small electric appliance PCB circuit board test point to be tested is contacted with the top surface thimble of the special detection equipment; the special detection equipment is also provided with a photoelectric sensor for monitoring whether the PCB to be detected is in place or not.

3. The multiple testing method for the small electric appliance PCB circuit board as claimed in claim 1, wherein the step S2 further comprises the following steps:

and S21, starting special equipment, and when the multi-connected PCB to be detected is powered on, firstly connecting a simulation load, and then outputting one of the voltages DC2.1V, DC 2.5.5V and DC2.9V to the multi-connected PCB or outputting the three voltages to the multi-connected PCB in sequence so as to detect the performance, input and output parameters of the PCB circuit.

4. The multiple testing method for small electric appliance PCB circuit boards as claimed in claim 3, wherein the step S4 further comprises the following steps:

5. A small electric appliance PCB multi-connection test special device for implementing the method of claims 1-4, which comprises a shell (1), and is characterized in that: the upper surface of the shell is provided with a top surface, and the top surface is provided with a thimble (4); the shell in be equipped with: the device comprises an external AC power interface, an air pressure driving module, a control circuit board (13), a key switch/test switch, an AC/DC power conversion module, a simulation load, a PCB top surface to be tested and an LCD display screen, wherein the external AC power interface, the air pressure driving module, the key switch/test switch, the AC/DC power conversion module, the simulation load and the control circuit board (13) are electrically connected in sequence; the air pressure driving module enables the testing point on the bottom surface of the PCB to be tested to be electrically contacted with the thimble on the top surface; the control circuit board (13) is internally provided with a CPU control chip, and the control chip is internally provided with a test program.

6. The small electric appliance PCB multi-connection test special device as claimed in claim 5, wherein: touch chip (15) are installed to one side of CPU control chip (14) of control circuit board (13), photoelectric sensor (16) are installed to one side of touch chip (15), CPU control chip (14) and touch chip (15) electric connection.

7. The small electric appliance PCB multi-connection test special device as claimed in claim 5, wherein: the utility model discloses a portable electronic device, including casing (1), top surface one side of casing (1) is fixed with dog (2), first draw-in groove (3) have been seted up to the top surface bilateral symmetry of dog (2), thimble (4) are installed to the bilateral symmetry of dog (2), the bilateral symmetry of thimble (4) is fixed with rectangular block (5), cavity (6) have been seted up to the inside equidistance of rectangular block (5), the cavity (6) be fixed with spring (7), the end fixing of spring (7) has fixture block (8), LCD display screen (9) are installed to one side of rectangular block (5), first pilot lamp (10) and second pilot lamp (11) are installed to one side of LCD display screen (9).

8. The small electric appliance PCB multi-connection test special device as claimed in claim 7, wherein: and the end part of the clamping block (8) is provided with a second clamping groove (12), and the depth of the second clamping groove (12) is the same as that of the first clamping groove (3).

9. The small electric appliance PCB multi-connection test special device as claimed in claim 7, wherein: the heights of the first clamping groove (3), the second clamping groove (12) and the ejector pin (4) are in the same horizontal plane.

10. The small electric appliance PCB multi-connection test special device as claimed in claim 5, wherein: twelve groups of thimbles (4) are arranged, twelve groups of thimbles (4) are symmetrically arranged every six groups, and twelve groups of thimbles (4) are numbered from 1 to 12 in sequence through external arrangement.