TWI452313B - Fpga-based embedded inspection system for circuit board - Google Patents

Description

FPGA-based embedded circuit board inspection system

The present invention relates to an FPGA-based embedded circuit board inspection system, and more particularly to a detection system capable of graphically displaying whether a circuit board is conductive.

Electrical detection is an important part of the manufacturing process of printed circuit boards (PCBs). In the process of making empty boards, as the board continues to develop toward high density, fine pitch and multi-level, it will inevitably cause defects due to external factors, such as short circuit, open circuit, leakage, etc. The components are found before, which can effectively reduce the waste of cost.

The conventional printed circuit board detection method visually observes whether the appearance of the printed circuit board is flawed by the image-based detection method of photographing, thereby controlling the quality and yield of the product.

However, the conventional image detection method cannot detect the inner layer circuit of the multilayer circuit board, and therefore it is impossible to detect whether the internal circuit of the circuit board is defective.

In view of the above problems of the prior art, one of the objects of the present invention is to provide an embedded circuit board detection system based on a field-programmable gate array (FPGA) to effectively detect the inside of the circuit board. line Road, thereby improving the accuracy of board inspection. In addition, with the large number of FPGAs and user-configurable I/O pins, it is more suitable for the wiring structure of more complex boards.

According to another object of the present invention, the present invention provides an FPGA-based embedded circuit board inspection system for electrically conducting a test of a printed circuit board having a plurality of lines. The FPGA-based embedded circuit board inspection system includes at least an FPGA chip, an embedded device, and a display device.

In other words, the FPGA chip is electrically connected to the probe bed. The FPGA chip obtains a second detection signal by transmitting a first detection signal to the printed circuit board by the probe bed to detect electrical continuity of each line.

In addition, the probe bed has a plurality of retractable probes. The probe bed is more mechanically coupled to the lifting device such that the elastomeric probe of the probe bed selectively contacts the printed circuit board. Therefore, if the copper on the printed circuit board is unevenly distributed or the detection platform is slightly different, the elastic probe can be used to accurately touch the detection point to reduce the error during detection.

The aforementioned lifting device is driven by a servo motor, and the detecting device further adjusts the pulse width of the servo motor by the FPGA chip to drive the servo motor.

In other words, the embedded device electrically connects the FPGA chip to the second detection signal by using the transmission interface, and the embedded device patterns the second detection signal to obtain and transmit the third detection signal. The FPGA chip numbers each line by the first detection signal, so that the embedded device maps the numbered lines. In this way, the inspectors can quickly grasp the problem points and reduce unnecessary labor waste.

The aforementioned transmission interface is selected from the International Society of Electrical and Electronics Engineers (IEEE) 1394 Ethnicity, Universal Serial Bus (USB), Serial Advanced Technology Attachment (SATA), Integrated Drive Electronics (IDE), Recommended Standard 232 (RS232), and Small Computer System Interface (SCSI).

In other words, the display device is electrically connected to the embedded device. The display device receives the third detection signal to display the circuit of the printed circuit board, and graphically displays whether the respective lines are turned on or not. By using the in-circuit circuit board detection system, the circuit board can be found in time to effectively improve the accuracy of the board detection.

In addition, the printed circuit board further includes a plurality of detecting contacts and a plurality of grounding contacts, and the detecting contacts are electrically connected to the grounding contacts by wires. The FPGA chip transmits the first detection signal to each detection contact by the probe bed, and the FPGA chip measures the potential of each ground contact to detect whether the respective lines are turned on or not to obtain the second detection signal.

In view of the above, an FPGA-based embedded circuit board inspection system in accordance with the present invention may have one or more of the following advantages:

(1) The FPGA-based embedded circuit board inspection system of the present invention enables the inspectors to quickly grasp the problem points and reduce unnecessary labor waste by the patterning of the lines.

(2) The FPGA-based embedded circuit board detection system of the present invention can timely discover the circuit board 瑕疵 to effectively improve the accuracy of the circuit board detection.

(3) The FPGA-based embedded circuit board detection system of the present invention utilizes an elastic probe to accurately touch the detection point to reduce the error during detection.

In order to make the reviewer's technical characteristics and the effects achieved by the reviewer more advanced A one-step understanding and understanding, please refer to the preferred embodiment and the detailed description as follows.

10‧‧‧FPGA chip

11‧‧‧First detection signal

12‧‧‧Second detection signal

20‧‧‧Printed circuit board

30‧‧‧ probe bed

31‧‧‧Elastic probe

40‧‧‧ embedded devices

41‧‧‧ Third detection signal

50‧‧‧ display device

60‧‧‧ lifting device

61‧‧‧Servo motor

71, 81-82, 91-92‧‧‧ lines

72, 83, 93‧‧‧ test contacts

73, 84-85, 94-95‧‧‧ Grounding contacts

Figure 1 is a block diagram of an FPGA-based embedded circuit board inspection system of the present invention.

Figure 2 is a schematic diagram showing whether the circuit of the FPGA-based embedded circuit board detection system is turned on.

Hereinafter, an embodiment of an embedded circuit board detecting system based on a Field-programmable Gate Array (FPGA) according to the present invention will be described with reference to the related drawings, in order to facilitate understanding, in the following embodiments. The same elements are denoted by the same reference numerals.

Please refer to FIG. 1 and FIG. 2 , which is a block diagram of an FPGA-based embedded circuit board detection system of the present invention. Figure 2 is a schematic diagram showing whether the circuit of the FPGA-based embedded circuit board detection system is turned on. The FPGA-based embedded circuit board inspection system includes at least an FPGA chip 10, an embedded device 40, and a display device 50.

In other words, the FPGA chip 10 is electrically connected to the probe bed 30. The FPGA chip 10 can transmit the first detection signal 11 to the detection contacts 72, 83, 93 of the printed circuit board 20, for example, by the retractable probe 31 of the probe bed 30, thereby measuring the ground connection of the printed circuit board 20. The potentials of the points 73, 84, 85, 94, and 95 are used to detect the electrical conduction of the lines 71, 81, 82, 91, 92 to obtain the second detection signal 12. Wherein, the detecting contacts 72, 83, 93 are electrically connected to the ground contact by the lines 71, 81, 82, 91, 92. 73, 84, 85, 94, 95.

In other words, the first detection signal 11 can be, for example, a current or a voltage. The ground contacts 73, 84, 85, 94, 95 can be electrically connected to the ground terminal, for example, by a resistor. When the FPGA chip 10 transmits the first detection signal 11 to the detection contact 72, for example, the detection contact 72 is at a high potential, and if the line 71 is in an on state, the ground contact 73 is at a high potential.

On the contrary, when the FPGA chip 10 transmits the first detection signal 11 to the detection contact 83, for example, the detection contact 83 is at a high potential, and if the line 82 is in an open state, the ground contact 85 is at a low potential (ground). Thereby, the potential of the ground contacts 73, 84, 85, 94, 95 can be used to detect whether the lines 71, 81, 82, 91, 92 are electrically connected.

In addition, the probe bed 30 can be mechanically connected to the lifting device 60, for example, by soldering or crimping, so that the elastic probe 31 of the probe bed 30 selectively contacts the detecting contacts 72, 83 of the printed circuit board 20, 93 and ground contacts 73, 84, 85, 94, 95. The elastic probe 31 can be, for example, a metal probe having a spring mechanism. However, the present invention is not limited thereto, and any probe capable of accurately contacting each detection point should fall within the scope of the claimed invention. Therefore, if the copper unevenness of the printed circuit board 20 is encountered or the detection platform is slightly different, the elastic probe 31 can be used to accurately touch the detection point to reduce the error during detection.

In addition, the lifting device 60 can be driven by the servo motor 61, for example, and the detecting device can adjust the pulse width of the servo motor 61 to drive the servo motor 61 by the FPGA chip 10. However, the present invention is not limited thereto, as long as it can be driven. The motor of the lifting device 60 is intended to be within the scope of the claimed invention.

In other words, the embedded device 40 is electrically connected to the FPGA chip 10 through the transmission interface to capture the second detection signal 12, and the embedded device 40 maps the second detection signal 12 to take The third detection signal 41 is obtained and transmitted. The FPGA chip 10 numbers each line 71, 81, 82, 91, 92 by the first detection signal 11, so that the embedded device 40 will map the numbered lines 71, 81, 82, 91, 92. Modeling.

The aforementioned embedded device 40 may be, for example, an embedded development board using an S3C6410 embedded chip based on Samsung, but the invention is not limited thereto. The aforementioned transmission interface is selected from the International Institute of Electrical and Electronics Engineers (IEEE) 1394 interface, Universal Serial Bus (USB), Serial High-Tech Accessories (SATA), Integrated Drive Electronics (IDE), and Recommended Standard 232 (RS232). And a small computer system interface (SCSI) group, but the invention is not limited thereto.

In other words, the display device 50 is electrically connected to the embedded device 40. The display device 50 receives the third detection signal 41 to display the lines 71, 81, 82, 91, 92 of the printed circuit board 20, and graphically displays the conduction of the respective lines 71, 81, 82, 91, 92. The embedded device 40 can be output to the display device 50, for example, by a video graphics array (VGA) or a high definition multimedia interface (HDMI), and the display device 50 can be, for example, a liquid crystal display. A field emission display, a plasma display, an electroluminescent display or a vacuum fluorescent display, but the invention is not limited thereto.

For example, display device 50 displays the relative positions of respective lines 71, 81, 82, 91, 92 on printed circuit board 20. If the line 71 is in the on state, the display device 50 can, for example, indicate the line 71 as a solid line.

Conversely, if line 82 is in an open state, display device 50 can, for example, indicate line 82 as a dashed line. However, the present invention is not limited thereto, and any display manner of distinguishing whether the respective lines 71, 81, 82, 91, 92 are turned on or off on the display device 50 should belong to the present invention. The scope of protection requested by Ming. In order to enable the inspectors to quickly grasp the problem points, and reduce unnecessary labor waste, it can effectively improve the accuracy of board detection.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

10‧‧‧FPGA chip

11‧‧‧First detection signal

12‧‧‧Second detection signal

20‧‧‧Printed circuit board

30‧‧‧ probe bed

31‧‧‧Elastic probe

40‧‧‧ embedded devices

41‧‧‧ Third detection signal

50‧‧‧ display device

60‧‧‧ lifting device

61‧‧‧Servo motor

Claims (9)

An embedded circuit board detection system based on a field-programmable gate array (FPGA) for electrically conducting a test on a printed circuit board having a plurality of lines, the FPGA-based embedded circuit The board detection system includes: an FPGA chip electrically connected to a probe bed, wherein the FPGA chip transmits a first detection signal to the printed circuit board to detect electrical continuity of the lines. Obtaining a second detection signal; an embedded device electrically connecting the FPGA chip by a transmission interface to capture the second detection signal, and the embedded device patterning the second detection signal to obtain and transmit a third detection signal, wherein the FPGA chip numbers each of the lines by the first detection signal, so that the embedded device maps the numbered lines; and a display device The embedded device is electrically connected, and the display device receives the third detection signal to display a circuit diagram of the lines of the printed circuit board. The FPGA-based embedded circuit board inspection system of claim 1, wherein the probe bed has a plurality of elastic probes, and the probe bed is mechanically connected to a lifting device to make the probe bed The elastic probes selectively contact the printed circuit board. The FPGA-based embedded circuit board inspection system of claim 2, wherein the lifting device is driven by a servo motor. An FPGA-based embedded circuit board inspection system as described in claim 3 The FPGA chip further drives the servo motor by adjusting a pulse width of the servo motor. The FPGA-based embedded circuit board inspection system of claim 1, wherein the circuit diagram displays the lines of the printed circuit board and graphically displays whether the lines are conductive or not. The FPGA-based embedded circuit board inspection system of claim 1, wherein the printed circuit board further comprises a plurality of detection contacts and a plurality of ground contacts, wherein the detection contacts are through the lines Electrically connected to the ground contacts. The FPGA-based embedded circuit board inspection system of claim 6, wherein the FPGA chip transmits the first detection signal to the detection contacts by using the probe bed. The FPGA-based embedded circuit board inspection system of claim 7, wherein the FPGA chip measures the potentials of the ground contacts to detect whether the lines are turned on or not to obtain the second detection signal. The FPGA-based embedded circuit board inspection system according to claim 1, wherein the transmission interface is selected from an International Institute of Electrical and Electronics Engineers (IEEE) 1394 interface, a universal serial bus (USB), and a sequential high order. A group of technical accessories (SATA), integrated drive electronics (IDE), recommended standard 232 (RS232), and small computer system interface (SCSI).