CN109143032B - Circuit board self-detection system - Google Patents
Circuit board self-detection system Download PDFInfo
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- CN109143032B CN109143032B CN201811022573.9A CN201811022573A CN109143032B CN 109143032 B CN109143032 B CN 109143032B CN 201811022573 A CN201811022573 A CN 201811022573A CN 109143032 B CN109143032 B CN 109143032B
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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]
- G01R31/281—Specific types of tests or tests for a specific type of fault, e.g. thermal mapping, shorts testing
- G01R31/2812—Checking for open circuits or shorts, e.g. solder bridges; Testing conductivity, resistivity or impedance
Abstract
The invention discloses a circuit board self-detection system. The device comprises a control module, a measuring module and a first analog switch module. The first input end and the second input end of the first analog switch module are respectively and electrically connected with the first driving output end and the second driving output end of the measuring module, and the output end of the first analog switch module is electrically connected to the transmission line. The first analog switch controls the switching of the channels according to the control signal output by the control module, and transmits the driving signals output by the first driving output end and the second driving output end of the measuring module to the transmission line. The first detection input end of the measurement module is electrically connected with the transmission line, the measurement module is used for detecting the output signal of the output end of the first analog switch module, and whether the transmission line has short circuit and/or open circuit is determined according to the detected signal, so that the detection cost is reduced, the detection efficiency of the circuit board is improved, meanwhile, the detection at any time in the use process of the circuit board can be realized, and the reliability of the circuit board is improved.
Description
Technical Field
The embodiment of the invention relates to a circuit board detection technology, in particular to a circuit board self-detection system.
Background
In the Circuit board detection, after the Circuit board is packaged, an external test environment such as a power supply device, a design detection substrate, an ammeter and the like needs to be established for general functional tests, and related tests are performed through In Circuit Tester (ICT) devices. If additional functionality tests are required, such as open or short circuit tests to detect the presence of a channel, manual measurements may also be required. Therefore, the detection cost is increased, extra labor is required to be consumed, the consumed time is long, and the efficiency is low. In addition, when the circuit board is used in the field, the use environment may limit, relevant detection and calibration cannot be performed under no condition, and the test cannot be performed at any time, so that the reliability of the circuit board cannot be guaranteed.
Disclosure of Invention
The invention provides a circuit board self-detection system, which is used for reducing the detection cost and improving the detection efficiency of a circuit board, and meanwhile, the circuit board self-detection system can realize the detection at any time in the use process of the circuit board and improve the reliability of the circuit board.
In a first aspect, an embodiment of the present invention provides a circuit board self-detection system, including a control module, a measurement module, and a first analog switch module;
the control module is electrically connected with the control end of the measurement module;
a first input end and a second input end of the first analog switch module are respectively and electrically connected with a first driving output end and a second driving output end of the measuring module, and an output end of the first analog switch module is electrically connected to the transmission line; the control end of the first analog switch module is electrically connected with the control module, and the first analog switch can transmit the driving signals output by the first driving output end and the second driving output end of the measuring module to the transmission line according to the switching of the control signal control channel output by the control module;
and a first detection input end of the measurement module is electrically connected with the transmission line, the measurement module is used for detecting an output signal of an output end of the first analog switch module, and whether the transmission line has short circuit and/or open circuit is determined according to the detected signal.
Specifically, a first driving output end of the measurement module outputs a first current signal, and if a first detection input end of the measurement module does not detect a voltage signal, the transmission line is open.
Specifically, a first driving output end of the measurement module outputs a second current signal, a second driving output end of the measurement module outputs a first voltage signal, and if the first detection input end of the measurement module detects the first voltage signal, the transmission line has a short circuit.
Specifically, the circuit board self-detection system further comprises a second analog switch module and a power supply module, wherein the control end of the second analog switch module is electrically connected with the control module, the output end of the power supply module is electrically connected with the input end of the second analog switch module, and the output end of the second analog switch module is electrically connected with the second detection input end of the measurement module.
Specifically, the second analog switch module includes a third analog switch unit and a fourth analog switch unit;
the input end of the third analog switch unit and the input end of the fourth analog switch unit are electrically connected with the output end of the power supply module, the output end of the third analog switch unit is electrically connected with the second detection input end of the measurement module, and the output end of the fourth analog switch unit is electrically connected with the second detection input end of the measurement module.
Specifically, the power supply module includes a plurality of power supply output terminals, the third analog switch unit and the fourth analog switch unit each include a plurality of input terminals, and the power supply voltages output by the plurality of power supply output terminals are different; and each power supply output end is electrically connected with the plurality of input ends of the third analog switch unit in a one-to-one correspondence manner, and is electrically connected with the plurality of input ends of the fourth analog switch unit in a one-to-one correspondence manner.
Specifically, the circuit board self-detection system further comprises a third analog switch module and at least one standard resistor; the control end of the third analog switch module is electrically connected with the control module, the input end of the third analog switch module is electrically connected with the third driving output end of the measuring module, the output end of the third analog switch module is electrically connected with the first end of the standard resistor and the third detection input end of the measuring module, and the second end of the standard resistor is grounded.
Specifically, the first analog switch module comprises a first analog switch unit and a second analog switch unit;
the control end of the first analog switch unit and the control end of the second analog switch unit are electrically connected with the control module; a first input end of the first analog switch unit is electrically connected with a first driving output end of the measuring module, a second input end of the first analog switch unit is electrically connected with a second driving output end of the measuring module, and an output end of the first analog switch unit is electrically connected with an input end of the second analog switch unit; and the output end of the second analog switch unit is electrically connected with the first detection input end of the measurement module.
Specifically, the circuit board self-detection system further comprises a plurality of diodes, negative terminals of the plurality of diodes are connected with output terminals of the second analog switch units in a one-to-one correspondence manner, and positive terminals of the diodes are grounded.
Specifically, the measuring module further comprises a plurality of load driving output ends, and the plurality of load driving output ends are electrically connected with the load and used for driving the load to work.
According to the technical scheme, the circuit board self-detection system comprises a control module, a measurement module and a first analog switch module. The control module is electrically connected with the control end of the measuring module, the first input end and the second input end of the first analog switch module are respectively and electrically connected with the first driving output end and the second driving output end of the measuring module, and the output end of the first analog switch module is electrically connected to the transmission line. The control end of the first analog switch module is electrically connected with the control module, and the first analog switch can transmit the driving signals output by the first driving output end and the second driving output end of the measuring module to the transmission line according to the switching of the control signal control channel output by the control module. The first detection input end of the measurement module is electrically connected with the transmission line, the measurement module is used for detecting the output signal of the output end of the first analog switch module, and whether the transmission line has short circuit and/or open circuit is determined according to the detected signal, so that the detection cost is reduced, the detection efficiency of the circuit board is improved, meanwhile, the detection at any time in the use process of the circuit board can be realized, and the reliability of the circuit board is improved.
Drawings
Fig. 1 is a schematic structural diagram of a circuit board self-inspection system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another circuit board self-inspection system according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a principle of detecting a short circuit and an open circuit of a channel by a circuit board self-detection system according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a principle of detecting a channel open circuit by a circuit board self-detection system according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a principle of detecting a short circuit of a channel by a circuit board self-detection system according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another circuit board self-inspection system according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another circuit board self-inspection system according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of another circuit board self-inspection system according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a measurement module according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a first analog switch unit according to an embodiment of the present invention;
fig. 11 is a schematic structural diagram of a second analog switch unit according to an embodiment of the present invention;
fig. 12 is a schematic structural diagram of a second analog switch module according to an embodiment of the present invention;
fig. 13 is a schematic structural diagram of a third analog switch module according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a circuit board self-testing system according to an embodiment of the present invention, as shown in fig. 1, the circuit board self-testing system includes a control module 10, a measurement module 20, and a first analog switch module 30.
The control module 10 is electrically connected to the control terminal ctrl1 of the measurement module 20, the first input terminal in1 and the second input terminal in2 of the first analog switch module 30 are electrically connected to the first driving output terminal Dout1 and the second driving output terminal Dout2 of the measurement module 20, respectively, and the output terminal out of the first analog switch module 30 is electrically connected to the transmission line L. The control terminal ctrl2 of the first analog switch module 30 is electrically connected to the control module 10, and the first analog switch 30 controls the switching of the channels according to the control signal output by the control module 10, so as to transmit the driving signals output by the first driving output terminal Dout1 and the second driving output terminal Dout2 of the measurement module 20 to the transmission line L.
The first detection input Cin1 of the measurement module 20 is electrically connected to the transmission line L, and the measurement module 20 is configured to detect an output signal of the output out of the first analog switch module 30, and determine whether the transmission line L has a short circuit and/or an open circuit according to the detected signal.
In particular, the measurement module 20 may comprise a plurality of measurement units. Illustratively, the Measurement Unit may be a Precision Measurement Unit (PMU), and the Measurement module 20 may include a plurality of PMUs. For example, if the PMUs are AD5522 chips, each PMU includes 4 output channels, and if the measurement module 20 includes 5 AD5522 chips, the measurement module 20 includes 20 output channels, and correspondingly includes 20 outputs. The measurement module 20 includes a plurality of modes, the modes of which are controlled by the control module 10. The signal output end of the control module 10 is electrically connected to the signal input end of the measurement module 10, and when the circuit board normally works, the measurement module 20 can be used as a driving module to drive the load on the circuit board to work according to the signal output by the signal output end of the control module 10. The multiple output channels of the measurement module 20 are used as driving channels for driving the load on the circuit board, for example, the multiple output ends out of the measurement module 20 are used as multiple load driving output ends, and the multiple driving output ends are electrically connected to the load on the circuit board for driving the load to work. The load may be another circuit or chip on the circuit board. During circuit board self-test, the measurement module 20 may serve as a detection module, and the detection module includes a driving detection mode and an induction detection mode. The multiple output channels of the measurement module 20 are used as the detection channels of the self-detection system of the circuit board, and at this time, the multiple output ends out of the measurement module 20 can be respectively used as the first driving output ends Dout1 of the corresponding channels. When a certain channel is detected, the output end of the measurement module 20 corresponding to the channel to be detected is the first driving output end Dout1, and the output end of the measurement module 20 corresponding to the adjacent channel is the second driving output end Dout 2. The signal output by the multiple channels of the measurement module 20 is transmitted to the transmission line L through the first analog switch module 30, so that the first analog switch module 30 includes a plurality of input terminals respectively corresponding to the multiple channels of the measurement module 20. The first analog switch module 30 includes a plurality of output terminals out, and each input terminal of the first analog switch module 30 corresponds to one output terminal out. The transmission line L includes a plurality of channels, and the plurality of channels are connected to the plurality of output terminals out of the first analog switch module 30 in a one-to-one correspondence.
It should be noted that, when the control module 10 provides a signal to the measurement module 20, the measurement module 20 can normally output the signal and implement the mode switching. Therefore, the channel detected by the measurement module 20 includes a channel output by the control module 10, passing through the measurement module 20 and the first analog switch module 30 to the transmission line L.
The detection of a certain channel can be divided into open circuit detection and short circuit detection. When the open circuit is detected, the control signal output by the control module 10 controls the to-be-detected channel of the first analog switch module 30 to be turned on, and the first driving output terminal Dout1 of the measurement module 20 (i.e., the output terminal of the measurement module 20 corresponding to the to-be-detected channel) outputs a first current signal to the to-be-detected channel, and transmits the first current signal to the transmission line L through the output terminal out corresponding to the to-be-detected channel of the first analog switch module 30. The first detection input Cin1 of the measurement module 20 is electrically connected to the transmission line L, and when there is no open circuit in the transmission line L, the first current signal output by the measurement module 20 can be transmitted through the transmission line L, and the first current signal passes through the transmission line L, so that the measurement module 20 can detect the signal on the transmission line L through the first detection input Cin 1. When there is an open circuit in the transmission line L, the first current signal output by the measurement module 20 cannot be transmitted through the transmission line L, and the first current signal cannot be transmitted on the transmission line L, so that the measurement module 20 cannot detect the signal on the transmission line L through the first detection input Cin 1. Because the measuring module 20 is arranged on the circuit board, the transmission line L can be subjected to open circuit detection at any time through the measuring module 20 in the using process of the circuit board, the circuit board is not limited by environment, and the reliability of the circuit board is improved.
In general, the first detection input Cin1 of the measurement module 20 is electrically connected to one end of the transmission line L, and the other end of the transmission line L is electrically connected to a load on the circuit board, so that a voltage signal can be formed at the other end of the transmission line L, and therefore, when there is no open circuit in the transmission line L, the signal detected by the first detection input Cin1 of the measurement module 20 can be a voltage signal. It can be seen that if the first detection input Cin1 of the measurement module 20 detects a voltage signal, the transmission line L is not broken. If the first detection input Cin1 of the measurement module 20 cannot detect a signal, there is an open circuit in the transmission line L. Therefore, whether the transmission line L has broken circuit can be determined by whether the measuring module 20 can detect the signal, manual measurement is not needed, the detection cost is reduced, and the detection efficiency of the circuit board is improved.
When the short circuit test is performed, the control signal output by the control module 10 controls the to-be-detected channel of the first analog switch module 30 to be conducted with one channel adjacent to the to-be-detected channel, and the first driving output end Dout1 of the measurement module 20 (i.e., the output end of the measurement module 20 corresponding to the to-be-detected channel) outputs a second current signal to the to-be-detected channel, and transmits the second current signal to the channel corresponding to the to-be-detected channel in the transmission line L. The second driving output terminal Dout2 of the measurement module 20 (i.e. the output terminal of the measurement module 20 corresponding to the channel to be detected) outputs the first voltage signal to the channel adjacent to the channel to be detected, and transmits the first voltage signal to the other channel corresponding to the channel in the transmission line L. The first detection input terminal Cin1 of the measurement module 20 is electrically connected to the transmission line L, and when there is a short circuit between adjacent channels in the transmission line L, the voltage detected by the first detection input terminal Cin1 of the measurement module 20 is a first voltage signal of the adjacent channel of the channel to be detected. For example, the first voltage signal may be 0V. And a second current signal is arranged in the channel to be detected, and when the voltage in the channel to be detected is detected, no voltage difference exists in the channel to be detected, so that the detected voltage is still 0V. When there is no short circuit between adjacent channels in the transmission line L, the signal in the transmission line L corresponding to the channel to be detected is a second current signal, the other end of the transmission line L is electrically connected to the load on the circuit board, and the potential at the other end of the transmission line L is related to the load, so that the measurement module 20 detects that the voltage signal on the transmission line L is different from the first voltage signal through the first detection input Cin 1. It can be seen that if the signal detected by the first detection input Cin1 of the measurement module 20 is a first voltage signal, a short circuit exists in the adjacent channel in the transmission line L. If the signal detected at the first detection input Cin1 of the measurement module 20 is not the first voltage signal, then there is no short circuit in the adjacent channel in the transmission line L. Similarly, the transmission line L can be detected for short circuit at any time by the measuring module 20, without being limited by the environment, and the reliability of the circuit board is improved. In the detection process, manual measurement is not needed, so that the detection cost is reduced, and the detection efficiency of the circuit board is improved.
It should be noted that the open circuit test and the short circuit test of the same channel can be performed in a time-sharing manner, and when performing the short circuit test, the short circuit test needs to be performed by using the channel adjacent to the channel to be tested. The channels adjacent to the channel to be tested comprise two, optionally one of the channels is used for the short circuit test of the channel to be tested.
According to the technical scheme of the embodiment, the circuit board self-detection system comprises a control module, a measurement module and a first analog switch module. The control module is electrically connected with the control end of the measuring module, the first input end and the second input end of the first analog switch module are respectively and electrically connected with the first driving output end and the second driving output end of the measuring module, and the output end of the first analog switch module is electrically connected to the transmission line. The control end of the first analog switch module is electrically connected with the control module, and the first analog switch can transmit the driving signals output by the first driving output end and the second driving output end of the measuring module to the transmission line according to the switching of the control signal control channel output by the control module. The first detection input end of the measurement module is electrically connected with the transmission line, the measurement module is used for detecting the output signal of the output end of the first analog switch module, and whether the transmission line has short circuit and/or open circuit is determined according to the detected signal, so that the detection cost is reduced, the detection efficiency of the circuit board is improved, meanwhile, the detection at any time in the use process of the circuit board can be realized, and the reliability of the circuit board is improved.
On the basis of the above technical solution, fig. 2 is a schematic structural diagram of another circuit board self-inspection system according to an embodiment of the present invention. As shown in fig. 2, the first analog switch module includes a first analog switch unit 31 and a second analog switch unit 32. The control terminal ctrl3 of the first analog switch unit 31 and the control terminal ctrl4 of the second analog switch unit 32 are electrically connected to the control module 10. A first input end in11 of the first analog switch unit 31 is electrically connected with a first driving output end Dout1 of the measuring module 20, a second input end in21 of the first analog switch unit 31 is electrically connected with a second driving output end Dout2 of the measuring module 20, and an output end of the first analog switch unit 31 is electrically connected with an input end of the second analog switch unit 32; the output out of the second analog switching unit 32 is electrically connected to the first detection input Cin1 of the measurement module 20.
Specifically, as shown in fig. 2, the control module includes a main control unit 11 and an auxiliary control unit 12, the main control unit 11 is electrically connected to the control terminal ctrl1 of the measurement module 20, the control terminal ctrl3 of the first analog switch unit 31, and the control terminal ctrl4 of the second analog switch unit 32, and is configured to control the operation mode of the measurement module 20, the channel selection of the first analog switch unit 31 and the second analog switch unit 32, and output a driving signal for driving a load. The auxiliary control unit 12 is configured to output a driving signal for driving a load. As can be seen, the signals for driving the load include the driving signal output from the main control unit 11 and the driving signal output from the sub control unit 12. The measurement module 20 includes multiple channels, and in the process of detecting whether the channel to be detected has a short circuit with an adjacent channel, the adjacent channel needs to be used for detection. Illustratively, when detecting whether a short circuit exists in a channel corresponding to the first input terminal in11 of the first analog switch unit 31 shown in fig. 2, the channel is set as a channel to be detected, and a channel adjacent to the channel is set as an auxiliary channel. The first input terminal in11 of the first analog switch unit 31 serves as the first input terminal of the first analog switch module, and the second input terminal in21 of the first analog switch unit 31 serves as the second input terminal of the first analog switch module. The first driving output end Dout1 of the measuring module 20 is electrically connected to the channel to be detected, and the second driving output end Dout2 is electrically connected to the auxiliary channel. The main control unit 11 controls the measurement module to be in the driving detection mode, the first driving output terminal Dout1 of the measurement module 20 outputs the second current signal to the second input terminal in21 of the first analog switch unit 31, and the second driving output terminal Dout2 outputs the first voltage signal to the first input terminal in11 of the first analog switch unit 31. At this time, in order to detect the channel to be detected corresponding to the main control unit 11 and the channel to be detected corresponding to the auxiliary control unit 12, the first analog switch unit 31 expands the signals input by the first input terminal in11 and the second input terminal in21, divides the signals into 4 paths of output, which are the current signal and the voltage signal corresponding to the main control unit 11 and the current signal and the voltage signal corresponding to the auxiliary control unit 12, inputs the 4 paths of output to the second analog switch unit 32, and integrates the 4 paths of output to 2 paths of output through the second analog switch unit 32. At this time, 1 channel of the second analog switch unit 32 outputs a detection signal corresponding to the measurement module 20 as a detection module for detecting the channel corresponding to the main control unit 11, and the other 1 channel outputs a detection signal corresponding to the measurement module 20 as a detection module for detecting the channel corresponding to the auxiliary control unit 12. The second analog switch unit 32 outputs the 1-channel and the other 1-channel of the detection signal of the measurement module 20 as the detection mode of the detection module to be electrically connected with the first detection signal input end Cin1 of the measurement module 20, and the measurement unit 20 judges whether the channel has short circuit or open circuit according to the signal detected by the first detection signal input end Cin 1.
On the basis of the above technical solution, fig. 3 is a schematic diagram illustrating a principle of detecting a short circuit and an open circuit of a channel by a circuit board self-detection system according to an embodiment of the present invention. As shown in fig. 3, the circuit board self-detection system further includes a plurality of diodes D, negative terminals of the plurality of diodes D are connected to output terminals of the second analog switch unit in a one-to-one correspondence, and a positive terminal of each diode D is grounded.
Specifically, as shown in fig. 3, the output ends of the second analog switch units correspond to the diodes D one-to-one, so that when detecting whether there is an open circuit in a certain channel L1, the measuring module 20 outputs a first current signal to the channel L1 to be detected, and one end of the input signal of the channel L1 to be detected is equivalent to being electrically connected to a current source I1. For example, the first current signal may be-100 uA, and when there is no open circuit in a certain channel L1, the first current signal may turn on the diode D corresponding to the first current signal, so that there is a voltage drop of-0.7V at the diode D, and therefore the measurement module 20 may detect the voltage drop of the diode D, and there is no open circuit in this channel L1. Fig. 4 is a schematic diagram illustrating the principle of the self-testing system for circuit boards detecting a channel break according to the embodiment of the present invention, as shown in fig. 4, when there is a break in one of the channels L1, the first current signal cannot be transmitted to the cathode of the diode D of the channel L1 to be tested, and therefore the measuring module 20 cannot detect the voltage drop of the diode D corresponding to the channel L1 to be tested. Therefore, the voltage value of the channel to be detected L1 can be detected by the measuring module 20 to determine whether there is an open circuit in the channel to be detected L1.
With reference to fig. 3, when detecting whether a short circuit exists in a certain channel L2, the measuring unit 20 outputs a second current signal to a channel L1 adjacent to the channel L2 to be detected, one end of an input signal of the channel L1 adjacent to the channel L2 to be detected is equivalent to being electrically connected to a current source I1, the measuring module 20 outputs a first voltage signal to a channel L2 to be detected, and one end of an input signal of the channel L2 to be detected is equivalent to being electrically connected to a voltage source U1. For example, the second current signal may be 100uA, and the first voltage signal may be 0V. When the short circuit does not exist in the channel L2 to be detected, the second current signal is not transmitted to the channel L2 to be detected, and the voltage of the channel L2 to be detected is detected by the measuring module 20 to be the negative value of the voltage drop of the diode D, and is-0.7V. Fig. 5 is a schematic diagram illustrating a principle of detecting a channel short circuit by a circuit board self-detection system according to an embodiment of the present invention, as shown in fig. 5, when a short circuit exists between a channel to be detected L2 and a channel adjacent to the channel to be detected L1, a current of the channel adjacent to L1 is transmitted to the channel to be detected L2, and at this time, the voltage of the channel to be detected L2 detected by the measurement module 20 is 0V. Therefore, whether the short circuit exists in the channel to be detected L2 can be determined by detecting the voltage value of the channel to be detected L2 through the measuring module 20.
On the basis of the above technical solutions, fig. 6 is a schematic structural diagram of another circuit board self-detection system according to an embodiment of the present invention, as shown in fig. 6, the circuit board self-detection system further includes a second analog switch module 40 and a power supply module 50, a control terminal ctrl5 of the second analog switch module 40 is electrically connected to the control module 10, an output terminal of the power supply module 50 is electrically connected to an input terminal of the second analog switch module 40, and an output terminal of the second analog switch module 40 is electrically connected to a second detection input terminal Cin2 of the measurement module 20.
Specifically, the power module 50 includes a plurality of power output terminals, each of which may output a different voltage. The second analog switch module 40 includes a plurality of inputs, each corresponding to a respective one of the power outputs of the power module 50. The control module 10 may control the power module 50 to output different voltages through the control terminal ctrl6 of the power module 50, and control the selection of the channel of the second analog switch module 40 corresponding to the output voltage of the power module 50. When the voltage signal output by the power module 50 is transmitted to the second detection input Cin2 of the measurement module 20 through the second analog switch module 40, the control module 10 controls the measurement module 20 to be in the sensing detection mode, so that the measurement module 20 can determine whether the power module 50 is normally powered according to the signal detected by the second detection input Cin 2. The measurement module 20 may detect a voltage signal, and when the power module 50 supplies power normally, a difference between the voltage signal detected by the measurement module 20 and a standard voltage signal output when the power module 50 supplies power normally is within a standard deviation range. Illustratively, the standard voltage signal of the power module 50 is 16V when the power module 50 is normally powered, the standard deviation is within ± 1%, and the voltage signal detected by the measurement module 20 is within the range of 15.84V-16.16V when the power module 50 is normally powered. When the power module 50 cannot normally supply power, the difference between the voltage signal detected by the measurement module 20 and the standard voltage signal output by the power module 50 when the power module 50 normally supplies power may exceed the standard deviation range, for example, the standard voltage signal is 16V when the power module 50 normally supplies power, the standard deviation is within a range of ± 1%, the voltage signal detected by the measurement module 20 is out of a range of 15.84V to 16.16V, and at this time, the power module 50 needs to be adjusted. Illustratively, the voltage output by the power module 50 may be compensated for by software programming.
Alternatively, the measurement module 20 may detect the current signal, and when the power module 50 supplies power normally, the difference between the current signal detected by the measurement module 20 and the standard current signal output when the power module 50 supplies power normally is within the standard deviation range. When the power module 50 cannot normally supply power, the difference between the current signal detected by the measurement module 20 and the standard current signal output by the power module 50 when the power module 50 normally supplies power may exceed the standard deviation range, and at this time, the power module 50 needs to be adjusted.
According to the technical scheme, the circuit board self-detection system further comprises a power supply module and a second analog switch module, wherein the control end of the second analog switch module is electrically connected with the control module, the output end of the power supply module is electrically connected with the input end of the second analog switch module, and the output end of the second analog switch module is electrically connected with the second detection input end of the measurement module. The measuring module calibrates the power supply module according to the voltage or current signal input by the second detection input end, so that normal power supply of the power supply module can be guaranteed, and reliability of the circuit board is improved.
On the basis of the above technical solutions, fig. 7 is a schematic structural diagram of another circuit board self-detection system according to an embodiment of the present invention, and as shown in fig. 7, the second analog switch module includes a third analog switch unit 41 and a fourth analog switch unit 42.
The input end of the third analog switch unit and the input end of the fourth analog switch unit are electrically connected with the output end of the power supply module 50, the output end of the third analog switch unit 41 is electrically connected with the second detection input end Cin2 of the measurement module 20, and the output end of the fourth analog switch unit 42 is electrically connected with the second detection input end Cin2 of the measurement module 20.
Specifically, as shown in fig. 7, the power supply module 50 includes a plurality of power supply output terminals, and the third analog switch unit 41 and the fourth analog switch unit 42 each include a plurality of input terminals, and the power supply voltages output by the plurality of power supply output terminals are different. Each of the power supply output terminals is electrically connected to a plurality of input terminals of the third analog switch unit 41 in a one-to-one correspondence, and is electrically connected to a plurality of input terminals of the fourth analog switch unit 42 in a one-to-one correspondence. At this time, the third analog switch unit 41 may be connected to transmit a voltage signal for detecting the voltage signal of the power module 50, and the fourth analog switch unit 42 may be connected to transmit a current signal for detecting the current signal of the power module 50. Therefore, the voltage signal and the current signal of the power module 50 can be detected by the third analog switch unit 41 and the fourth analog switch unit 42, and the voltage calibration and the current calibration of the power module 50 can be respectively realized.
It should be noted that the voltage calibration and the current calibration of the power module 50 can be performed in a time-sharing manner, and the measurement module 20 detects the voltage signal and the current signal through the second detection input Cin2 in a time-sharing manner.
On the basis of the above technical solutions, fig. 8 is a schematic structural diagram of another circuit board self-testing system according to an embodiment of the present invention, and as shown in fig. 8, the circuit board self-testing system further includes a third analog switch module 60 and at least one standard resistor R. The control terminal ctrl8 of the third analog switch module 60 is electrically connected to the control module 10, the input terminal in3 of the third analog switch module 60 is electrically connected to the third driving output terminal Dout3 of the measurement module 20, the output terminal out3 of the third analog switch module 60 is electrically connected to the first terminal a of the standard resistor R and the third detection input terminal Cin3 of the measurement module 20, and the second terminal b of the standard resistor R is grounded.
Specifically, as shown in fig. 8, in the process of calibrating the standard resistance R, the control module 10 controls the measurement unit 20 to be in the driving detection mode. The measuring unit 20 outputs a standard current signal with a current value i, and the standard current signal is transmitted to the standard resistor R through the third analog switch unit 60, and the second end b of the standard resistor R is grounded, so that the potential u of the first end a of the standard resistor R is greater than zero, and the potential value u is ri, where R is the resistance value of the standard resistor R. Since i is the current value of the reference current signal output by the measuring means 20, the actual resistance value R' of the reference resistor R can be determined from the potential u at the first end a of the reference resistor R, based on R ═ u/i. The third detection input Cin3 of the measurement module 20 detects the potential u of the first end a of the standard resistor R, determines the actual resistance R ' of the standard resistor R, compares the actual resistance R ' with the standard resistance R of the standard resistor R, and if the difference between the actual resistance R ' and the standard resistance R is within the standard deviation range, the resistance of the standard resistor R is accurate. If the difference between the actual resistance value R' and the standard resistance value R is outside the standard deviation range, the resistance value of the standard resistance R is inaccurate, and the standard resistance R needs to be compensated. Illustratively, the voltage output by the power module 50 may be compensated for by software programming.
Based on the above technical solutions, fig. 9 is a schematic structural diagram of a measurement module according to an embodiment of the present invention, fig. 10 is a schematic structural diagram of a first analog switch unit according to an embodiment of the present invention, and fig. 11 is a schematic structural diagram of a second analog switch unit according to an embodiment of the present invention. As shown in fig. 9 to 11, each measurement module 20 may include a plurality of AD5522 chips (only one AD5522 chip is exemplarily shown here), each AD5522 chip including 4 inputs and 4 outputs. When the AD5522 chip is used for detecting whether a channel has a short circuit or an open circuit, an output end corresponding to the channel to be detected is selected as a first driving output end Dout1, and an output end adjacent to the first driving output end Dout1 is selected as a second driving output end Dout2, and is used for outputting a detection signal when the channel is detected. When the AD5522 chip is used to detect the power module 50, one output terminal may be selected as the third driving output terminal Dout 3. The other output terminal Dout of the AD5522 chip may also be used as a driving output terminal when being detected. It should be noted that the AD5522 chip requires the peripheral circuit 21 to operate normally.
The first driving output terminal Dout1 and the second driving output terminal Dout2 of the AD5522 chip output driving signals to the first input terminal in11 and the second input terminal in21 of the first analog switch unit 31, the four output terminals out11 to out14 of the first analog switch unit 31 are electrically connected to the four input terminals of the second analog switch unit 32, and the second analog switch unit 32 outputs two-way signals, that is, the output terminal out of the second analog switch unit 32 in fig. 11. As shown in fig. 10 and 11, each of the first and second analog switch units 31 and 32 may be an ADG 1412. It should be noted that other input terminals in of the first analog switch unit 31 may be connected to other output terminals of the AD5522 chip.
The two signals output by the second analog switch unit 32 pass through the first detection input end Cin1 of the AD5522 chip 20, and the AD5522 chip 20 determines whether the channel has a short circuit or an open circuit according to the signal detected by the first detection signal input end Cin 1.
Fig. 12 is a schematic structural diagram of a second analog switch module according to an embodiment of the present invention. As shown in fig. 9 and 12, the third analog switch unit 41 and the fourth analog switch unit 42 may be ADG1606 chips, the power module 50 transmits the voltage signal to the third analog switch unit 41 and the fourth analog switch unit 42 through the output terminal, and the third analog switch unit 41 and the fourth analog switch unit 42 are connected in different manners. An output voltage signal and an output current signal. Illustratively, the third analog switching unit 41 outputs a voltage signal, and when detecting the voltage of the power supply module 50, the detection may be performed by the third analog switching unit 41. The fourth analog switching unit 42 outputs a current signal, which can be detected by the fourth analog switching unit 42 when detecting the current of the power module 50. And vice versa. Since the signals output by the third analog switch unit 41 and the fourth analog switch unit 42 are detected through the second detection input Cin2 of the AD5522 chip 20, the voltage calibration and the current calibration of the power module 50 can be performed in time division.
Fig. 13 is a schematic structural diagram of a third analog switch module according to an embodiment of the present invention, and as shown in fig. 9 and 13, the third analog switch module 60 may be composed of two ADG1408 chips and a J1500 chip. When the third analog switch module 60 detects a plurality of standard resistors R, the third driving output terminal Dout3 of the AD5522 chip 20 outputs a standard current, a plurality of voltage signals are formed after passing through the plurality of standard resistors R, the plurality of voltage signals select the voltage signal corresponding to the standard resistor R to be detected through the third analog switch module 60 to be output through the third analog switch module 60, the third detection input terminal Cin3 of the AD5522 chip 20 detects the voltage signal corresponding to the standard resistor R to be detected output by the third analog switch module 60, and whether the standard resistor R to be detected is within the standard deviation range is determined according to the voltage signal.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (8)
1. A circuit board self-detection system is characterized by comprising a control module, a measurement module and a first analog switch module;
the control module is electrically connected with the control end of the measurement module;
a first input end and a second input end of the first analog switch module are respectively and electrically connected with a first driving output end and a second driving output end of the measuring module, and an output end of the first analog switch module is electrically connected to the transmission line; the control end of the first analog switch module is electrically connected with the control module, and the first analog switch can transmit the driving signals output by the first driving output end and the second driving output end of the measuring module to the transmission line according to the switching of the control signal control channel output by the control module;
a first detection input end of the measurement module is electrically connected with the transmission line, the measurement module is used for detecting an output signal of an output end of the first analog switch module, and whether the transmission line has short circuit and/or open circuit is determined according to the detected signal;
the circuit board self-detection system also comprises a second analog switch module and a power supply module, wherein the control end of the second analog switch module is electrically connected with the control module, the output end of the power supply module is electrically connected with the input end of the second analog switch module, and the output end of the second analog switch module is electrically connected with the second detection input end of the measurement module;
the circuit board self-detection system also comprises a third analog switch module and at least one standard resistor; the control end of the third analog switch module is electrically connected with the control module, the input end of the third analog switch module is electrically connected with the third driving output end of the measurement module, the output end of the third analog switch module is electrically connected with the first end of the standard resistor and the third detection input end of the measurement module, and the second end of the standard resistor is grounded;
a third detection input end of the measurement module detects the potential of the first end of the standard resistor, determines the actual resistance value of the standard resistor, compares the actual resistance value with the standard resistance value of the standard resistor, and if the difference between the actual resistance value and the standard resistance value is within the standard deviation range, the resistance value of the standard resistor is accurate; if the difference between the actual resistance value and the standard resistance value is outside the standard deviation range, the resistance value of the standard resistance is inaccurate, and the standard resistance needs to be compensated.
2. The circuit board self-detection system according to claim 1, wherein the first driving output terminal of the measurement module outputs a first current signal, and the transmission line has an open circuit if the first detection input terminal of the measurement module does not detect a voltage signal.
3. The circuit board self-detection system according to claim 1, wherein the first driving output terminal of the measurement module outputs a second current signal, the second driving output terminal of the measurement module outputs a first voltage signal, and the transmission line has a short circuit if the first voltage signal is detected at the first detection input terminal of the measurement module.
4. The circuit board self-detection system according to claim 1, wherein the second analog switch module comprises a third analog switch unit and a fourth analog switch unit;
the input end of the third analog switch unit and the input end of the fourth analog switch unit are electrically connected with the output end of the power supply module, the output end of the third analog switch unit is electrically connected with the second detection input end of the measurement module, and the output end of the fourth analog switch unit is electrically connected with the second detection input end of the measurement module.
5. The circuit board self-detection system according to claim 4, wherein the power supply module comprises a plurality of power supply output terminals, the third analog switch unit and the fourth analog switch unit each comprise a plurality of input terminals, and the power supply output terminals output different power supply voltages; and each power supply output end is electrically connected with the plurality of input ends of the third analog switch unit in a one-to-one correspondence manner, and is electrically connected with the plurality of input ends of the fourth analog switch unit in a one-to-one correspondence manner.
6. The circuit board self-detection system according to claim 1, wherein the first analog switch module comprises a first analog switch unit and a second analog switch unit;
the control end of the first analog switch unit and the control end of the second analog switch unit are electrically connected with the control module; a first input end of the first analog switch unit is electrically connected with a first driving output end of the measuring module, a second input end of the first analog switch unit is electrically connected with a second driving output end of the measuring module, and an output end of the first analog switch unit is electrically connected with an input end of the second analog switch unit; and the output end of the second analog switch unit is electrically connected with the first detection input end of the measurement module.
7. The circuit board self-detection system according to claim 6, further comprising a plurality of diodes, wherein negative terminals of the plurality of diodes are connected to the output terminals of the second analog switch units in a one-to-one correspondence, and a positive terminal of each of the diodes is grounded.
8. The circuit board self-detection system according to claim 1, wherein the measurement module further comprises a plurality of load driving outputs electrically connected to a load for driving the load to operate.
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| CN111856218A (en) * | 2020-06-08 | 2020-10-30 | 苏州市运泰利自动化设备有限公司 | Simulation product current verification test system and method |
| CN112578266A (en) * | 2020-11-27 | 2021-03-30 | 杭州长川科技股份有限公司 | Self-checking system applied to semiconductor test equipment |
| CN113162443A (en) * | 2021-03-10 | 2021-07-23 | Tcl空调器(中山)有限公司 | Multi-source output circuit and power supply |
| CN117368700B (en) * | 2023-12-07 | 2024-02-09 | 深圳市易检车服科技有限公司 | Automatic test system and automatic test method for circuit board in wireless equalizer |
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