A circuit function board automatic detection system

Abstract

The utility model relates to circuit board technical field, propose a kind of circuit function board automatic detection system, including the I / V conversion circuit, signal conditioning circuit and control circuit connected in proper order, the input of I / V conversion circuit is used to connect the circuit function board to be measured, the control circuit is connected with host computer communication, the control circuit still connects I / V conversion circuit and signal conditioning circuit through drive circuit, for the switching of control I / V conversion circuit and signal conditioning circuit measurement threshold value. Through above-mentioned technical scheme, when circuit function board automatic detection system works, the flexible switching of measurement threshold value is realized, to adapt to different detection needs. Entire system passes through the cooperative work of each circuit, can automatically, accurately and efficiently complete the detection to circuit function board, improve detection efficiency and accuracy, reduce manual intervention and error.

Description

Technical Field

[0001] This utility model relates to the field of circuit board technology, specifically to an automatic detection system for circuit function boards. Background Technology

[0002] Ensuring the performance of circuit function boards meets standards is crucial in the production and quality inspection stages. Traditional testing methods rely heavily on manual operation, using various independent testing instruments such as multimeters and oscilloscopes to measure each parameter of the circuit function board. With the rapid development of electronic technology, the integration level of circuit function boards is increasing, and their functions are becoming more complex, leading to a significant increase in the number of testing items and indicators. Traditional manual testing is not only inefficient and unable to meet the needs of large-scale production, but the test results are also easily affected by human factors such as the skill level of the testers and the degree of adherence to operating procedures, resulting in poor accuracy and consistency of the test data and failing to provide a reliable basis for quality control of circuit function boards. Utility Model Content

[0003] This invention proposes an automatic detection system for circuit function boards, which solves the problems of low efficiency and poor accuracy in the detection of circuit function boards in the prior art.

[0004] The technical solution of this utility model is as follows:

[0005] An automatic testing system for circuit function boards includes an I / V conversion circuit, a signal conditioning circuit, and a control circuit connected in sequence. The input terminal of the I / V conversion circuit is used to connect to the circuit function board under test. The control circuit is communicatively connected to a host computer. The control circuit is also connected to the I / V conversion circuit and the signal conditioning circuit through a drive circuit to control the switching of the measurement thresholds of the I / V conversion circuit and the signal conditioning circuit.

[0006] Furthermore, the I / V conversion circuit includes operational amplifier U1, operational amplifier U2, capacitor C1, and multiple conversion branches. Each conversion branch has the same circuit structure. Each conversion branch includes a first normally open switch K1-1 of relay K1, a second normally open switch K1-2 of relay K1, a resistor R1, and a MOSFET Q1. The non-inverting input terminal of operational amplifier U1 receives the current to be measured output by the circuit function board. The inverting input terminal of operational amplifier U1 is connected to the first terminal of resistor R1 through the first normally open switch K1-1. The second terminal of resistor R1 is connected to the drain of MOSFET Q1. The source of MOSFET Q1 is connected to the output terminal of operational amplifier U1, and the gate is connected to the control circuit. The second terminal of resistor R1 is also connected to the non-inverting input terminal of operational amplifier U2 through the first normally open switch K1-2. The first terminal of capacitor C1 is connected to the inverting input terminal of operational amplifier U1, and the second terminal of capacitor C1 is connected to the second terminal of resistor R1. The inverting input terminal of operational amplifier U2 is connected to the output terminal, and the output terminal of operational amplifier U2 is connected to the output terminal of the signal conditioning circuit.

[0007] Furthermore, the signal conditioning circuit includes operational amplifier U3, resistors R2 and R6, and multiple conditioning branches. Each conditioning branch has the same circuit structure. Each conditioning branch includes a first normally open switch K3-1 of relay K3, a second normally open switch K3-2 of relay K3, resistor R3, capacitor C2, and operational amplifier U4. The inverting input terminal of operational amplifier U3 is connected to the output terminal of the I / V conversion circuit through resistor R2, and the non-inverting input terminal is grounded through resistor R6. The first end of resistor R3 is connected to the inverting input terminal of operational amplifier U3, and the second end of resistor R3 is connected to the output terminal of operational amplifier U3 through the first normally open switch K3-1 of relay K3. Capacitor C2 is connected in parallel with resistor R3. The second end of resistor R3 is also connected to the non-inverting input terminal of operational amplifier U4 through the second normally open switch K3-2 of relay K3. The inverting input terminal of operational amplifier U4 is connected to the output terminal, and the output terminal of operational amplifier U4 is connected to the control circuit.

[0008] Furthermore, the driving circuit includes multiple switching control branches, each with the same circuit structure. Each switching control branch includes a transistor Q3, a resistor R7, a resistor R8, and a control coil of a relay K1. The base of the transistor Q3 is connected to the control circuit through the resistor R7, the emitter is grounded, and the collector is connected to the control coil of the relay K1 and the resistor R8 in series and then connected to the VCC power supply.

[0009] Furthermore, the driving circuit also includes multiple conditioning control branches, each with the same circuit structure. Each conditioning control branch includes a transistor Q5, a resistor R11, a resistor R12, and a control coil of a relay K3. The base of the transistor Q5 is connected to the control circuit through a resistor R11, the emitter is grounded, and the collector is connected in series with the control coil of the relay K3 and a resistor R12 before being connected to the VCC power supply.

[0010] The working principle and beneficial effects of this utility model are as follows:

[0011] In this invention, when the automatic circuit board testing system is working, the output signal of the circuit board under test is input to the I / V conversion circuit, which converts the current signal into a voltage signal. The signal then enters the signal conditioning circuit for further processing. The control circuit communicates with the host computer, receives instructions, and simultaneously controls the I / V conversion circuit and the signal conditioning circuit through the drive circuit, enabling flexible switching of the measurement threshold to adapt to different testing requirements. Through the coordinated operation of all circuits, the entire system can automatically, accurately, and efficiently complete the testing of the circuit board, improving testing efficiency and accuracy while reducing manual intervention and errors.

[0012] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0013] Figure 1 This is a circuit diagram of the I / V conversion circuit in this utility model;

[0014] Figure 2 This is a circuit diagram of the signal conditioning circuit in this utility model;

[0015] Figure 3 This is a circuit diagram of the control circuit in this utility model. Detailed Implementation

[0016] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0017] Example 1

[0018] This embodiment proposes an automatic detection system for circuit function boards, including an I / V conversion circuit, a signal conditioning circuit, and a control circuit connected in sequence. The input terminal of the I / V conversion circuit is used to connect to the circuit function board under test. The control circuit is connected to a host computer for communication. The control circuit is also connected to the I / V conversion circuit and the signal conditioning circuit through a drive circuit to control the switching of the measurement thresholds of the I / V conversion circuit and the signal conditioning circuit.

[0019] In this embodiment, when the automatic circuit board detection system is working, the output signal of the circuit board under test is input to the I / V conversion circuit, which converts the current signal into a voltage signal. The signal then enters the signal conditioning circuit for further processing. The control circuit communicates with the host computer, receives instructions, and simultaneously controls the I / V conversion circuit and the signal conditioning circuit through the drive circuit to flexibly switch the measurement threshold to adapt to different detection requirements. The entire system, through the coordinated operation of its various circuits, can automatically, accurately, and efficiently complete the detection of the circuit board, improving detection efficiency and accuracy while reducing manual intervention and errors.

[0020] In one implementation, such as Figure 1 As shown, the I / V conversion circuit includes operational amplifiers U1 and U2, capacitor C1, and two conversion branches. One conversion branch includes the first normally open switch K1-1 and the second normally open switch K1-2 of relay K1, resistor R1, and MOSFET Q1. The other conversion branch includes the first normally open switch K2-1 and the second normally open switch K2-2 of relay K2, resistor R4, and MOSFET Q2. The non-inverting input of operational amplifier U1 receives the current to be measured output from the circuit function board. The inverting input of operational amplifier U1 is connected to the first terminal of resistor R1 through the first normally open switch K1-1 of relay K1. The second terminal of resistor R1 is connected to the drain of MOSFET Q1. The source of MOSFET Q1 is connected to the output of operational amplifier U1, and the gate is connected to the control circuit. The second end of resistor R1 is also connected to the non-inverting input of operational amplifier U2 via the first normally open switch K1-2 of relay K1. The inverting input of operational amplifier U1 is connected to the first end of resistor R4 via the first normally open switch K2-1 of relay K2. The second end of resistor R4 is connected to the drain of MOSFET Q2. The source of MOSFET Q2 is connected to the output of operational amplifier U1, and the gate is connected to the control circuit. The second end of resistor R4 is also connected to the non-inverting input of operational amplifier U2 via the first normally open switch K2-2 of relay K2. The first end of capacitor C1 is connected to the inverting input of operational amplifier U1. The second end of capacitor C1 is connected to the second ends of resistor R1 and resistor R4. The inverting input of operational amplifier U2 is connected to the output. The output of operational amplifier U2 is connected to the output of the signal conditioning circuit.

[0021] In this embodiment, when the I / V conversion circuit is working, the current to be measured is input to the non-inverting input terminal of operational amplifier U1. The control circuit switches the conversion branch by controlling the on / off state of relays K1 and K2 according to the requirements. When the normally open switch of a certain relay is closed, the corresponding resistor is connected to the circuit, and the corresponding MOSFET is controlled to turn on or off to adjust the feedback characteristics. Operational amplifier U1 uses the connected resistor to convert the input current into voltage, and capacitor C1 acts as a filter for stabilization. The converted voltage signal is transmitted to the non-inverting input terminal of operational amplifier U2 through the normally open switch of the corresponding relay. Operational amplifier U2 forms a voltage follower for buffering and isolation before outputting to the signal conditioning circuit. This design, by flexibly switching the conversion branch, can adapt to current detection with different ranges and characteristics, improve conversion accuracy and flexibility, and ensure the accuracy of subsequent signal conditioning and detection.

[0022] In one implementation, such as Figure 2 As shown, the signal conditioning circuit includes operational amplifier U3, resistors R2 and R6, and two conditioning branches. One conditioning branch includes the first normally open switch K3-1 and the second normally open switch K3-2 of relay K3, resistor R3, capacitor C2, and operational amplifier U4. The other conditioning branch includes the first normally open switch K4-1 and the second normally open switch K4-2 of relay K4, resistor R5, capacitor C3, and operational amplifier U5. The inverting input terminal of operational amplifier U3 is connected to I through resistor R2. The output of the / V conversion circuit has the following connections: The non-inverting input is grounded via resistor R6; the first end of resistor R3 is connected to the inverting input of operational amplifier U3; the second end of resistor R3 is connected to the output of operational amplifier U3 via the first normally open switch K3-1 of relay K3; capacitor C2 is connected in parallel with resistor R3; the second end of resistor R3 is also connected to the non-inverting input of operational amplifier U4 via the second normally open switch K3-2 of relay K3; the inverting input of operational amplifier U4 is connected to its output; and the output of operational amplifier U4 is connected to the control circuit. Similarly, the first end of resistor R5 is connected to the inverting input of operational amplifier U3; the second end of resistor R5 is connected to the output of operational amplifier U5 via the first normally open switch K4-1 of relay K4; capacitor C3 is connected in parallel with resistor R5; the second end of resistor R5 is also connected to the non-inverting input of operational amplifier U5 via the second normally open switch K4-2 of relay K4; the inverting input of operational amplifier U5 is connected to its output; and the output of operational amplifier U5 is connected to the control circuit.

[0023] In this embodiment, when the signal conditioning circuit is working, the signal output from the I / V conversion circuit is connected to the inverting input of operational amplifier U3. Operational amplifier U3, along with resistors R2 and R6, forms a basic inverting amplification structure. The control circuit switches the conditioning branch by controlling the on / off states of relays K3 and K4 according to actual needs. When a normally open switch of a relay is closed, the corresponding resistor (R3 or R5) and parallel capacitor (C2 or C3) form a feedback network to filter and amplify the signal. The capacitor filters out high-frequency noise, and the resistor determines the amplification factor. The conditioned signal is then transmitted via the other normally open switch of the corresponding relay to a voltage follower formed by operational amplifiers U4 or U5 for buffering and isolation, and finally output to the control circuit. This circuit, by flexibly switching the conditioning branch, can precisely condition signals with different characteristics, effectively improving signal quality and providing a reliable guarantee for subsequent accurate detection.

[0024] In one implementation, such as Figure 3 As shown, the drive circuit includes two switching control branches. One switching control branch includes transistor Q3, resistors R7 and R8, and the control coil of relay K1. The base of transistor Q3 is connected to the control circuit through resistor R7, the emitter is grounded, and the collector is connected to the VCC power supply in series with the control coil of relay K1 and resistor R8. The other switching control branch includes transistor Q4, resistors R9 and R10, and the control coil of relay K2. The base of transistor Q4 is connected to the control circuit through resistor R9, the emitter is grounded, and the collector is connected to the VCC power supply in series with the control coil of relay K2 and resistor R10.

[0025] In this embodiment, when the drive circuit is working, the control circuit outputs corresponding control signals according to the detection requirements. When the control signal is transmitted to the base of transistor Q3 via resistor R7, if the signal turns on Q3, its collector current flows through the control coil of relay K1, causing relay K1 to energize and thus control the corresponding switching branch in the I / V conversion circuit to switch. Similarly, when the control signal turns on transistor Q4 via resistor R9, relay K2 energizes, allowing switching to another switching branch. Resistors R8 and R10 act as current limiters, protecting the transistors and relay coils. This drive circuit has a simple structure, can accurately respond to control circuit commands, reliably control relay operation, and flexibly switch the operating mode of the I / V conversion circuit to meet the detection requirements of different circuit function boards.

[0026] In one implementation, such as Figure 3As shown, the drive circuit also includes two conditioning control branches. One conditioning control branch includes transistor Q5, resistors R11 and R12, and the control coil of relay K3. The base of transistor Q5 is connected to the control circuit through resistor R11, the emitter is grounded, and the collector is connected to the VCC power supply in series with the control coil of relay K3 and resistor R12. The other conditioning control branch includes transistor Q6, resistors R13 and R14, and the control coil of relay K4. The base of transistor Q6 is connected to the control circuit through resistor R13, the emitter is grounded, and the collector is connected to the VCC power supply in series with the control coil of relay K4 and resistor R14.

[0027] In this embodiment, the control circuit outputs a specific control signal according to the actual detection requirements. When the signal is transmitted to the base of transistor Q5 via resistor R11, causing it to conduct, the collector current flows through the control coil of relay K3, causing relay K3 to engage and thus switching the corresponding conditioning branch in the signal conditioning circuit. Similarly, the control signal, via resistor R13, turns on transistor Q6, causing relay K4 to engage and switching to another conditioning branch. Resistors R12 and R14 are used for current limiting to protect the transistors and relay coils. The effect is to accurately and reliably respond to control circuit commands, flexibly control relay operation, and achieve on-demand switching of the signal conditioning circuit's operating mode, meeting the diverse signal conditioning requirements of different circuit function boards during detection.

[0028] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An automatic detection system for circuit function boards, characterized in that, It includes an I / V conversion circuit, a signal conditioning circuit, and a control circuit connected in sequence. The input terminal of the I / V conversion circuit is used to connect to the function board of the circuit under test. The control circuit is connected to the host computer for communication. The control circuit is also connected to the I / V conversion circuit and the signal conditioning circuit through a drive circuit, and is used to control the switching of the measurement threshold of the I / V conversion circuit and the signal conditioning circuit.

2. The automatic detection system for circuit function boards according to claim 1, characterized in that, The I / V conversion circuit includes operational amplifier U1, operational amplifier U2, capacitor C1, and multiple conversion branches. Each conversion branch has the same circuit structure. Each conversion branch includes a first normally open switch K1-1 of relay K1, a second normally open switch K1-2 of relay K1, a resistor R1, and a MOSFET Q1. The non-inverting input of operational amplifier U1 receives the current to be measured output by the circuit function board. The inverting input of operational amplifier U1 is connected to the first terminal of resistor R1 through the first normally open switch K1-1. The second terminal of resistor R1 is connected to the drain of MOSFET Q1. The source of MOSFET Q1 is connected to the output terminal of operational amplifier U1, and the gate is connected to the control circuit. The second terminal of resistor R1 is also connected to the non-inverting input of operational amplifier U2 through the first normally open switch K1-2. The first terminal of capacitor C1 is connected to the inverting input of operational amplifier U1, and the second terminal of capacitor C1 is connected to the second terminal of resistor R1. The inverting input of operational amplifier U2 is connected to the output terminal, and the output terminal of operational amplifier U2 is connected to the output terminal of the signal conditioning circuit.

3. The automatic detection system for circuit function boards according to claim 1, characterized in that, The signal conditioning circuit includes operational amplifier U3, resistors R2 and R6, and multiple conditioning branches. Each conditioning branch has the same circuit structure. Each conditioning branch includes a first normally open switch K3-1 and a second normally open switch K3-2 of relay K3, resistor R3, capacitor C2, and operational amplifier U4. The inverting input terminal of operational amplifier U3 is connected to the output terminal of the I / V conversion circuit through resistor R2, and the non-inverting input terminal is grounded through resistor R6. The first end of resistor R3 is connected to the inverting input terminal of operational amplifier U3, and the second end of resistor R3 is connected to the output terminal of operational amplifier U3 through the first normally open switch K3-1 of relay K3. Capacitor C2 is connected in parallel with resistor R3. The second end of resistor R3 is also connected to the non-inverting input terminal of operational amplifier U4 through the second normally open switch K3-2 of relay K3. The inverting input terminal of operational amplifier U4 is connected to the output terminal, and the output terminal of operational amplifier U4 is connected to the control circuit.

4. The automatic detection system for circuit function boards according to claim 1, characterized in that, The driving circuit includes multiple switching control branches, each with the same circuit structure. Each switching control branch includes a transistor Q3, a resistor R7, a resistor R8, and a control coil of a relay K1. The base of the transistor Q3 is connected to the control circuit through a resistor R7, the emitter is grounded, and the collector is connected in series with the control coil of the relay K1 and a resistor R8 before being connected to the VCC power supply.

5. The automatic detection system for circuit function boards according to claim 4, characterized in that, The driving circuit also includes multiple conditioning control branches, each with the same circuit structure. Each conditioning control branch includes a transistor Q5, a resistor R11, a resistor R12, and a control coil of a relay K3. The base of the transistor Q5 is connected to the control circuit through a resistor R11, the emitter is grounded, and the collector is connected in series with the control coil of the relay K3 and a resistor R12 before being connected to the VCC power supply.

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