Devices and systems for testing electronic components

Abstract

The utility model discloses a device and system for testing electronic components, and relates to the technical field of electronic component testing. The device for testing electronic components includes: a circuit board and a connector, wherein a plurality of welding pin pairs are provided on the circuit board, wherein one welding pin pair is used to weld an electronic component to be tested, and the first pins of all welding pin pairs are connected; the connector is detachably connected to the circuit board; when the connector is connected to the circuit board, an input end of the connector is connected to a second pin of one welding pin pair in a one-to-one correspondence, and all output ends of the connector are grounded. The utility model can quickly determine the electronic components that are broken down, and there is no need to disassemble all electronic components one by one and measure them separately, which saves time and effort and improves the testing efficiency of electronic components.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic component testing, in particular to a device and a system for testing electronic components. Background Art

[0002] At present, there are many electronic components in the circuit, and the commonly used electronic components include resistors, capacitors, etc. The resistor is a current limiting element. After the resistor is connected to the circuit, the resistor can limit the current passing through the branch it is connected to. It is mainly used to regulate and stabilize the current and voltage. The capacitor is an electronic component that stores electricity and energy. The performance of electronic components directly affects the performance of the circuit, so it is necessary to test electronic components such as resistors and capacitors to determine the performance of the electronic components.

[0003] In the prior art, when testing electronic components such as resistors and capacitors, because there are many samples, the electronic components are often operated in parallel in the circuit. Figure 1 As shown, a 5V voltage is applied to 100 capacitors in parallel. If one of the capacitors is short-circuited, the entire 5V power supply circuit will be short-circuited. To continue testing, the capacitors need to be removed one by one for individual inspection, which is very time-consuming and laborious. Utility Model Content

[0004] The embodiments of the utility model provide a device and a system for testing electronic components to solve the technical problem of time-consuming and labor-intensive testing of electronic components such as resistors and capacitors in the prior art.

[0005] In a first aspect, a device for testing electronic components is provided, comprising:

[0006] A circuit board, wherein a plurality of welding pin pairs are provided on the circuit board, one welding pin pair is used for welding an electronic component to be tested, and the first pins of all the welding pin pairs are connected;

[0007] A connector, the connector being detachably connected to the circuit board;

[0008] When the connector is connected to the circuit board, one input end of the connector is connected to the second pin of one of the welding pin pairs in a one-to-one correspondence, and all output ends of the connector are grounded.

[0009] In some embodiments, a power circuit is provided on the circuit board, an input end of the power circuit is connected to the mains, and an output end of the power circuit is connected to the first pins of all the welding pin pairs.

[0010] In some embodiments, the power supply circuit includes:

[0011] An AC / DC circuit, wherein the AC / DC circuit is used to convert the mains power into a preset first direct current;

[0012] A DC / DC circuit is connected to the AC / DC circuit and the first pins of all the welding pin pairs, and the DC / DC circuit is used to convert a preset first direct current into a preset second direct current and transmit it to the first pins of all the welding pin pairs.

[0013] In some embodiments, the circuit board is further provided with a current acquisition circuit, a controller and a display. The current acquisition circuit is arranged between the DC / DC circuit and the first pins of all the welding pin pairs. The current acquisition circuit is used to collect the current values ​​flowing through all the electronic components to be tested and transmit them to the controller. The controller is used to display the current values ​​collected by the current acquisition circuit through the display.

[0014] In some embodiments, the current acquisition circuit includes a resistor Ra, a resistor Rb, a resistor Rc, a resistor Rd, a resistor Re and an operational amplifier Ua;

[0015] The resistor Ra is arranged between the DC / DC circuit and the first pins of all the welding pin pairs, the first end of the resistor Rb is connected to the first end of the resistor Ra, the second end of the resistor Rb is connected to the inverting input terminal of the operational amplifier Ua, the first end of the resistor Rc is connected to the second end of the resistor Ra, the second end of the resistor Rc is connected to the non-inverting input terminal of the operational amplifier Ua, the first end of the resistor Rd is connected to the inverting input terminal of the operational amplifier Ua, the second end of the resistor Rd is connected to the output terminal of the operational amplifier Ua and the controller, the first end of the resistor Re is connected to the non-inverting input terminal of the operational amplifier Ua, and the second end of the resistor Re is grounded.

[0016] In some embodiments, the accuracy of the resistor Ra is 0.01% to 1%.

[0017] In some embodiments, a test switch is further provided on the circuit board, and the test switch is provided between the DC / DC circuit and the current acquisition circuit and is connected to the controller.

[0018] In some embodiments, the test switch uses a MOS switch tube, the gate of the MOS switch tube is connected to the controller, the source of the MOS switch tube is connected to the current acquisition circuit, and the drain of the MOS switch tube is connected to the output end of the DC / DC circuit.

[0019] In some embodiments, the device for testing electronic components further comprises:

[0020] A first test probe and a second test probe, wherein the first test probe and the second test probe are connected to the controller, and the first test probe and the second test probe are used to test a single electronic component to be tested.

[0021] In a second aspect, a system for testing electronic components is provided, comprising the aforementioned device for testing electronic components.

[0022] The beneficial effects brought by the technical solution provided by the utility model include:

[0023] The embodiment of the utility model provides a device and system for testing electronic components. The device for testing electronic components is provided with a circuit board and a connector. The circuit board is provided with a plurality of welding pin pairs, each of the welding pin pairs is used for welding the electronic components to be tested, and the connector is detachably connected to the circuit board. If any electronic component is broken down, the electronic component is short-circuited, and the current of all the electronic components connected in parallel will exceed the normal range. At this time, the connector is removed, and the second pin of a welding pin pair corresponding to each electronic component is exposed, and the second pins of all the welding pin pairs are independent of each other. In this way, any electronic component can be detected separately, and the broken electronic component can be quickly determined, without the need to disassemble all the electronic components one by one and measure them separately, thus saving time and effort and improving the testing efficiency of electronic components. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A schematic diagram of an existing device for testing electronic components;

[0026] Figure 2 A schematic diagram of a device for testing electronic components provided by an embodiment of the utility model;

[0027] Figure 3 A circuit diagram of a current acquisition circuit provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] The embodiment of the utility model provides a device for testing electronic components, which can solve the technical problem of time-consuming and labor-intensive testing of electronic components such as resistors and capacitors in the prior art.

[0030] See also Figure 2 As shown, an embodiment of the utility model provides a device for testing electronic components, including: a circuit board and a connector.

[0031] The circuit board is provided with a plurality of welding pin pairs, one welding pin pair is used for welding an electronic component to be tested, and the first pins of all the welding pin pairs are connected. The connector is detachably connected to the circuit board.

[0032] When the connector is connected to the circuit board, one input end of the connector is connected to the second pin of one of the welding pin pairs in a one-to-one correspondence, and all output ends of the connector are grounded.

[0033] See also Figure 2 As shown, assuming that the electronic component to be tested is a resistor, multiple resistors to be tested are welded on multiple welding pin pairs. For chip resistors, the two ends of a chip resistor are bonded to a welding pin pair and then welded by solder. For example, point A and point B in the figure are the first pin and the second pin of a welding pin pair, respectively. The connector is connected to the circuit board, and the welding pins of the connector can be directly connected to the reserved welding points on the circuit board by welding, and the solder is melted when disassembling, or the connector is a male and female connector that can be disassembled, the male part is welded to the circuit board, the male part and the female part are detachably plugged, and the welding pins of the connector are set on the female part. The connector is used to connect or disconnect the second pins of all the welding pin pairs to the GND ground.

[0034] A voltage is applied to the first pins of all the welding pin pairs. If all the resistors to be tested are normal, the current after all the resistors are connected in parallel is within the normal range. If any resistor is broken down, the resistor is short-circuited, and the current after all the resistors are connected in parallel will exceed the normal range. At this time, the connector is removed, and the second pin of a welding pin pair corresponding to each resistor is exposed, and the second pins of all the welding pin pairs are independent of each other. In this way, any resistor can be tested separately and the broken-down resistor can be quickly determined. There is no need to disassemble all the resistors one by one and measure them separately, which saves time and effort and improves the testing efficiency of electronic components.

[0035] As an optional implementation, in a utility model embodiment, see Figure 2 As shown, the circuit board is provided with a power circuit, the input end of the power circuit is connected to the mains, and the output end of the power circuit is connected to the first pins of all the welding pin pairs. The power circuit can apply voltage to the first pins of all the welding pin pairs to test the performance of the electronic components to be tested.

[0036] Specifically, see Figure 2 As shown, the power supply circuit includes: an AC / DC circuit and a DC / DC circuit. The AC / DC circuit is used to convert the mains power into a preset first direct current, the DC / DC circuit is connected to the AC / DC circuit and the first pins of all the welding pin pairs, and the DC / DC circuit is used to convert the preset first direct current into a preset second direct current and transmit it to the first pins of all the welding pin pairs.

[0037] For example, the AC / DC circuit can convert 220V AC mains power into a preset first DC power of 12V, and then convert the preset first DC power of 12V into a preset second DC power of 5V through the DC / DC circuit, and the preset second DC power of 5V is applied to n parallel resistors.

[0038] As an optional implementation, in a utility model embodiment, see Figure 2 As shown, the circuit board is also provided with a current collection circuit, a controller and a display. The current collection circuit is provided between the DC / DC circuit and the first pins of all the welding pin pairs. The current collection circuit is used to collect the total current value flowing through all the electronic components to be tested and transmit it to the controller. The controller is used to display the current value collected by the current collection circuit through the display. That is, the tester can observe the total current flowing through the n parallel resistors in real time through the display, which is convenient for the tester to determine whether there is a resistor breakdown.

[0039] As an optional implementation, in a utility model embodiment, see Figure 3As shown, the current acquisition circuit includes a resistor Ra, a resistor Rb, a resistor Rc, a resistor Rd, a resistor Re and an operational amplifier Ua.

[0040] The resistor Ra is arranged between the DC / DC circuit and the first pins of all the welding pin pairs, the first end of the resistor Rb is connected to the first end of the resistor Ra, the second end of the resistor Rb is connected to the inverting input terminal of the operational amplifier Ua, the first end of the resistor Rc is connected to the second end of the resistor Ra, the second end of the resistor Rc is connected to the non-inverting input terminal of the operational amplifier Ua, the first end of the resistor Rd is connected to the inverting input terminal of the operational amplifier Ua, the second end of the resistor Rd is connected to the output terminal of the operational amplifier Ua and the controller, the first end of the resistor Re is connected to the non-inverting input terminal of the operational amplifier Ua, and the second end of the resistor Re is grounded.

[0041] The resistor Ra is a current sampling resistor. The voltage across the resistor Ra can be amplified by the operational amplifier Ua and transmitted to the controller, thereby calculating the total current flowing through all the electronic components to be tested. Optionally, the accuracy of the resistor Ra is 0.01% to 1%, which can improve the sampling accuracy of the current.

[0042] As an optional implementation, in a utility model embodiment, see Figure 2 As shown, a test switch is also provided on the circuit board, and the test switch is provided between the DC / DC circuit and the current acquisition circuit and is connected to the controller. The test switch can control the opening or closing of the test loop to facilitate testing. Specifically, the test switch can adopt a MOS switch tube, the gate of the MOS switch tube is connected to the controller, the source of the MOS switch tube is connected to the current acquisition circuit, and the drain of the MOS switch tube is connected to the output end of the DC / DC circuit. The MOS switch tube has the advantages of low power consumption, high speed, small size, high stability, low noise, strong controllability, etc., which is convenient for testers to open or close the test circuit and improve test efficiency.

[0043] As an optional implementation, in a utility model embodiment, see Figure 2As shown, the device for testing electronic components also includes: a first test probe and a second test probe, the first test probe and the second test probe are connected to the controller, and the first test probe and the second test probe are used to test a single electronic component to be tested. Specifically, the controller can output a test signal to a single electronic component to be tested through the first test probe, and judge whether the single electronic component to be tested is normal according to the feedback signal result of the second test probe. The feedback signal result can be displayed on the display. Taking the electronic component as a resistor as an example for exemplary description, the controller is connected to the resistor through the first test probe and the second test probe to form a loop, and by detecting the voltage signal at both ends of the resistor, the voltage signal is displayed on the display, and the controller judges whether the resistor is faulty through the voltage signal.

[0044] An embodiment of the utility model further provides a system for testing electronic components, including the aforementioned device for testing electronic components.

[0045] The device for testing electronic components of the system for testing electronic components is provided with a circuit board and a connector, and a plurality of welding pin pairs are provided on the circuit board, each of the welding pin pairs is used for welding the electronic components to be tested, and the connector is detachably connected to the circuit board. If any electronic component is broken down, the electronic component is short-circuited, and the current of all the electronic components connected in parallel will exceed the normal range. At this time, the connector is removed, and the second pin of a welding pin pair corresponding to each electronic component is exposed, and the second pins of all the welding pin pairs are independent of each other. In this way, any electronic component can be tested separately, and the broken electronic component can be quickly determined, without the need to disassemble all the electronic components one by one and measure them separately, which saves time and effort and improves the testing efficiency of electronic components.

[0046] In the description of the present utility model, it should be noted that the terms "upper", "lower", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present utility model. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0047] It should be noted that, in the present utility model, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0048] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features of the present invention.

Claims

1. A device for testing electronic components, characterized in that: include: A circuit board, wherein a plurality of welding pin pairs are provided on the circuit board, one welding pin pair is used for welding an electronic component to be tested, and the first pins of all the welding pin pairs are connected; A connector, the connector being detachably connected to the circuit board; When the connector is connected to the circuit board, one input end of the connector is connected to the second pin of one of the welding pin pairs in a one-to-one correspondence, and all output ends of the connector are grounded.

2. The device for testing electronic components according to claim 1, characterized in that: A power circuit is provided on the circuit board, an input end of the power circuit is connected to the mains, and an output end of the power circuit is connected to the first pins of all the welding pin pairs.

3. The device for testing electronic components according to claim 2, characterized in that: The power supply circuit comprises: An AC / DC circuit, wherein the AC / DC circuit is used to convert the mains power into a preset first direct current; A DC / DC circuit is connected to the AC / DC circuit and the first pins of all the welding pin pairs, and the DC / DC circuit is used to convert a preset first direct current into a preset second direct current and transmit it to the first pins of all the welding pin pairs.

4. The device for testing electronic components according to claim 3, characterized in that: The circuit board is also provided with a current collection circuit, a controller and a display. The current collection circuit is arranged between the DC / DC circuit and the first pins of all the welding pin pairs. The current collection circuit is used to collect the current values ​​flowing through all the electronic components to be tested and transmit them to the controller. The controller is used to display the current value collected by the current collection circuit through the display.

5. The device for testing electronic components according to claim 4, characterized in that: The current acquisition circuit includes a resistor Ra, a resistor Rb, a resistor Rc, a resistor Rd, a resistor Re and an operational amplifier Ua; The resistor Ra is arranged between the DC / DC circuit and the first pins of all the welding pin pairs, the first end of the resistor Rb is connected to the first end of the resistor Ra, the second end of the resistor Rb is connected to the inverting input terminal of the operational amplifier Ua, the first end of the resistor Rc is connected to the second end of the resistor Ra, the second end of the resistor Rc is connected to the non-inverting input terminal of the operational amplifier Ua, the first end of the resistor Rd is connected to the inverting input terminal of the operational amplifier Ua, the second end of the resistor Rd is connected to the output terminal of the operational amplifier Ua and the controller, the first end of the resistor Re is connected to the non-inverting input terminal of the operational amplifier Ua, and the second end of the resistor Re is grounded.

6. The device for testing electronic components according to claim 5, characterized in that: The accuracy of the resistor Ra is 0.01% to 1%.

7. The device for testing electronic components according to claim 4, characterized in that: A test switch is also provided on the circuit board. The test switch is provided between the DC / DC circuit and the current collection circuit and is connected to the controller.

8. The device for testing electronic components according to claim 7, characterized in that: The test switch adopts a MOS switch tube, the gate of the MOS switch tube is connected to the controller, the source of the MOS switch tube is connected to the current collection circuit, and the drain of the MOS switch tube is connected to the output end of the DC / DC circuit.

9. The device for testing electronic components according to claim 4, characterized in that: Also includes: A first test probe and a second test probe, wherein the first test probe and the second test probe are connected to the controller, and the first test probe and the second test probe are used to test a single electronic component to be tested.

10. A system for testing electronic components, characterized in that: A device for testing electronic components comprising any one of claims 1-9.

Images