Device and method for automatically detecting short circuit of component bonding pad based on controller

Abstract

The invention belongs to the technical field of aviation component testing, and discloses a device and method for automatically detecting component bonding pad short circuit based on a controller, and the method comprises the steps: connecting a testing plug with a detected component, and carrying out the successive detection of the welding condition of a component pin through a sampling connector led out from an I / O port of a CPU controller, the test voltage value of each path is converted into a digital value through an AD channel of a port of the CPU controller, the digital value is compared with a set value, it is judged that short circuit exists in component pin welding when the collected value is lower than the set value, and it is judged that short circuit does not exist in component pin welding when the collected value is higher than the set value. The technical problem of low test efficiency in the prior art is solved, the circuit design is simple, the cost is saved, the reliability is high, and the problem of welding short circuit of adjacent pins of components on a circuit board can be automatically and rapidly detected.

Description

Technical Field

[0001] The invention belongs to the technical field of component testing of aviation power distribution systems, and in particular relates to a device and method for automatically detecting short circuits of component pads based on a controller. Background Art

[0002] Currently, in aircraft power distribution systems, short-circuit testing of product components is a key step. Many product circuit boards use components. Due to the structural characteristics of the components themselves, bridge welding short circuits are prone to occur at the bottom of the components after reflow soldering. Since the bridge is located at the bottom of the component, visual recognition detection equipment cannot automatically detect it, and X-ray machines have low efficiency and general results in detection, which may cause quality risks of welding short-circuit components entering the next process.

[0003] In summary, there is an urgent need for a device and method for automatically detecting short circuits in component pads based on a controller. Summary of the invention

[0004] The present invention provides a device and method for automatically detecting short circuits of component pads based on a controller, which can automatically and quickly detect the problem of welding short circuits of adjacent pins of components on a circuit board.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A device and method for automatically detecting short circuits of component pads based on a controller, comprising: a sampling joint, a sampling switching circuit, a CPU controller, a power conversion circuit, a battery, a device working indicator light, a fault alarm indicator light and a debugging interface; the device connects the component to be tested with the device through the sampling joint, controls the sampling switching circuit through the I / O port of the CPU controller, samples each channel of the sampling joint one by one, converts the voltage value into a digital value in the CPU controller, and then compares it with a preset value; if the voltage value is less than the preset value, the result is unqualified; if the voltage value is greater than or equal to the preset value, the result is qualified.

[0007] As a further technical solution of the present invention, the CPU controller controls whether the fault alarm indicator light flashes to determine whether the welding of components is qualified.

[0008] As a further technical solution of the present invention, the CPU controller is connected to the device working indicator light and the fault alarm indicator light to control the lights to turn on and off according to prefabricated requirements.

[0009] As a further technical solution of the present invention, the CPU controller is connected to a debugging interface, and the compiled program is burned into the CPU controller through the debugging interface.

[0010] As a further technical solution of the present invention, the device is powered by the battery, and the power conversion circuit converts the battery power into the working level of the CPU controller. When the CPU controller is powered on, it works normally and the device working indicator light is always on.

[0011] As a further technical solution of the present invention, the sampling connector is connected to a sampling switching circuit, and a plurality of sampling channels are provided on the sampling connector.

[0012] A method for automatically detecting short circuits of component pads based on a controller comprises the following steps:

[0013] Burn the written program into the CPU controller through the debugging interface;

[0014] Connect the components to be tested to the device through the sampling connector;

[0015] The sampling switching circuit is controlled by the CPU controller to sample each channel of the sampling connector one by one;

[0016] Convert the voltage value into a digital value through the CPU controller;

[0017] Compare the digital value with the preset value to determine whether the components are welded properly.

[0018] As a further technical solution of the present invention, the program running steps are as follows:

[0019] Start: The test program starts running;

[0020] Program initialization: Initialize the CPU controller clock, I / O interface, and light up the working indicator light;

[0021] The first channel is turned on: the CPU controller collects channel data;

[0022] Channel threshold judgment: The voltage value is converted into a digital signal through the internal AD of the CPU controller, compared with the preset value, and the first channel acquisition information is recorded to see whether there is a short circuit;

[0023] Step-by-step judgment: According to the first channel test method, test all N channels;

[0024] Whether there is a short circuit: Determine whether there is a short circuit from the first channel to the Nth channel. If there is a short circuit, the fault alarm indicator light flashes; if there is no short circuit, the fault alarm indicator light goes out;

[0025] After completion, conduct a new round of testing.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. For components with dense pin pads or pin pads, adjacent pads or pins are prone to short circuit after device welding, and the short circuit situation is difficult to be discovered. The device can automatically detect and quickly find the short circuit situation of welded components.

[0028] 2. Compared with existing products, the circuit design of the present invention is simple, cost-saving, highly reliable, and can quickly measure the overload protection time. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of a device for automatically detecting short circuits of component pads based on a controller according to the present invention;

[0030] Figure 2 The present invention is a flowchart of a method for automatically detecting short circuits in component pads based on a controller. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] First, see Figure 1 The present invention provides a device for automatically detecting short circuits of component pads based on a controller, which can automatically and quickly detect the problem of short circuits of adjacent pins of components on a circuit board. The device includes: a sampling connector 1, a sampling switching circuit 2, a CPU controller 3, a power conversion circuit 4, a battery 5, a device working indicator light 6, a fault alarm indicator light 7 and a debugging interface 8.

[0033] The device is powered by a battery 5, and the voltage is converted into the required working voltage through a power conversion circuit 4 to power the device. The CPU controller 3 is connected to the device working indicator light 6 and the fault alarm indicator light 7, and controls the lights to turn on and off according to prefabricated requirements. The CPU controller 3 is connected to the debugging interface 8 to download the prefabricated control program. The CPU controller 3 is connected to the sampling switching circuit 2 to collect test data of the sampling connector 1.

[0034] The written program is burned into the CPU controller 3 through the debugging interface 8. The device is powered by the battery 5, and the power conversion circuit 4 converts the battery power into the working level of the CPU controller 3. When the CPU controller 3 is powered on, it works normally, and the device working indicator light is always on.

[0035] The device connects the components to be tested to the device through the sampling connector 1, controls the sampling switching circuit through the I / O port of the CPU controller 3, samples each channel of the sampling connector 1 one by one, and converts the voltage value into a digital value through the CPU controller 3. If the voltage value is less than the preset value, the result is unqualified, and the CPU controller 3 controls the fault alarm indicator light to flash; if the voltage value is greater than or equal to the preset value, the result is qualified, and the CPU controller 3 controls the fault alarm indicator light to go out.

[0036] A device for automatically detecting short circuits of component pads by a fast-response, high-reliability controller is provided, the device comprising:

[0037] Principles of test component association;

[0038] Sampling switching circuit;

[0039] Debug interface circuit;

[0040] Sampling connector circuit;

[0041] Power conversion circuit;

[0042] In this device, every two detection fingers correspond to one switching channel.

[0043] The test device for detecting welding short circuits of adjacent pins of components can quickly detect the welding conditions of component pins after the components are batch welded on the circuit board to determine whether there is a welding short circuit on the component pins. The working process of the device is described below:

[0044] 1. Plug the sampling connector of the device into the corresponding plug of the test component;

[0045] 2. Turn on the power supply of the device. At this time, the working indicator light of the device is always on, indicating that the device is working normally.

[0046] 3. Insert the plug connected to the sampling connector into the test component and observe the alarm indicator. If the indicator is off, it means that the test component is welded normally; if it flashes, it means that the pin of the test component is short-circuited and needs to be reworked. After unplugging the plug, the alarm indicator automatically resets and goes off, and the next component is tested.

[0047] 4. After all tests are completed, simply disconnect the power supply of the device.

[0048] Second, see Figure 2 The present invention provides a method for automatically detecting short circuits of component pads based on a controller, which comprises the following steps:

[0049] Burn the written program into the CPU controller through the debugging interface;

[0050] Connect the components to be tested to the device through the sampling connector;

[0051] The sampling switching circuit is controlled by the CPU controller to sample each channel of the sampling connector one by one;

[0052] Convert the voltage value into a digital value through the CPU controller;

[0053] Compare the digital value with the preset value to determine whether the components are welded properly.

[0054] Preferably, the program runs as follows:

[0055] Start: The test program starts running;

[0056] Program initialization: Initialize the CPU controller clock, I / O interface, and light up the working indicator light;

[0057] The first channel is turned on: the CPU controller collects channel data;

[0058] Channel threshold judgment: The voltage value is converted into a digital signal through the internal AD of the CPU controller, compared with the preset value, and the first channel acquisition information is recorded to see whether there is a short circuit;

[0059] Step-by-step judgment: According to the first channel test method, test all N channels;

[0060] Whether there is a short circuit: Determine whether there is a short circuit from the first channel to the Nth channel. If there is a short circuit, the fault alarm indicator light flashes; if there is no short circuit, the fault alarm indicator light goes out;

[0061] After completion, conduct a new round of testing.

[0062] So far, the purpose of the present invention has been achieved.

[0063] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A device for automatically detecting short circuits of component pads based on a controller, characterized in that , including: a sampling connector, a sampling switching circuit, a CPU controller, a power conversion circuit, a battery, a device working indicator light, a fault alarm indicator light and a debugging interface; the device connects the components to be tested to the device through the sampling connector, controls the sampling switching circuit through the I / O port of the CPU controller, samples each channel of the sampling connector one by one, converts the voltage value into a digital value through the CPU controller, and then compares it with the preset value. If the voltage value is less than the preset value, the result is unqualified; if the voltage value is greater than or equal to the preset value, the result is qualified.

2. The device for automatically detecting short circuits of component pads based on a controller according to claim 1, characterized in that: The CPU controller controls whether the fault alarm indicator light flashes to determine whether the welding of components is qualified.

3. The device for automatically detecting short circuits of component pads based on a controller according to claim 2, characterized in that: The CPU controller is connected to the device working indicator light and the fault alarm indicator light, and controls the lights to turn on and off according to prefabricated requirements.

4. The device for automatically detecting short circuits of component pads based on a controller according to claim 3, characterized in that: The CPU controller is connected to a debugging interface, and the compiled program is burned into the CPU controller through the debugging interface.

5. The device for automatically detecting short circuits of component pads based on a controller according to claim 4, characterized in that: The device is powered by the battery, and the power conversion circuit converts the battery power into the working level of the CPU controller. When the CPU controller is powered on, it works normally and the device working indicator light is always on.

6. The device for automatically detecting short circuits of component pads based on a controller according to claim 5, characterized in that: The sampling connector is connected to the sampling switching circuit, and a plurality of sampling channels are arranged on the sampling connector.

7. A method for automatically detecting short circuits of component pads based on a controller, characterized in that: The steps include: Burn the written program into the CPU controller through the debugging interface; Connect the components to be tested to the device through the sampling connector; The sampling switching circuit is controlled by the CPU controller to sample each channel of the sampling connector one by one; Convert the voltage value into a digital value through the CPU controller; Compare the digital value with the preset value to determine whether the components are welded properly.

8. The method for automatically detecting short circuits of component pads based on a controller according to claim 7, characterized in that: The program runs as follows: Start: The test program starts running; Program initialization: Initialize the CPU controller clock, I / O interface, and light up the working indicator light; The first channel is turned on: the CPU controller collects channel data; Channel threshold judgment: The voltage value is converted into a digital signal through the internal AD of the CPU controller, compared with the preset value, and the first channel acquisition information is recorded to see whether there is a short circuit; Step-by-step judgment: According to the first channel test method, test all N channels; Whether there is a short circuit: Determine whether there is a short circuit from the first channel to the Nth channel. If there is a short circuit, the fault alarm indicator light flashes; There is no short circuit, and the fault alarm indicator light goes out; After completion, conduct a new round of testing.

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