Universal household appliance PCBA multifunctional testing device

Abstract

The utility model relates to the technical field of PCBA testing, in particular to a universal household appliance PCBA multifunctional testing device which comprises a shell and a cover plate detachably connected with the shell. A placing cavity is formed between the cover plate and the shell; an expansion mother board is arranged in the placing cavity; a plurality of clamping grooves are formed in the placement cavity; a plurality of collection plates are arranged in the placement cavity; the shell is provided with a communication interface and a power interface; the communication interface and the power interface are electrically connected with the expansion mother board. According to the utility model, the plurality of acquisition boards are arranged, commands are sent to the required acquisition boards through the unique addresses of the acquisition boards to read and acquire data information, and when the model to be tested is changed, the expansion mother board calls the resources of the corresponding acquisition boards to deal with the change, so that the universal function of testing all household electrical appliance PCBA products is achieved; meanwhile, a clamping groove mode is adopted, acquisition boards can be flexibly increased or decreased, and a hardware guarantee is provided for parallel testing.

Description

Technical Field

[0001] The utility model relates to the technical field of PCBA testing, and particularly relates to a multi-functional testing device for general household appliance PCBA. Background Art

[0002] During the production process of household appliances, the testing of PCBA (Printed Circuit Board Assembly) is a key link to ensure product quality. At present, most of the testing devices on the market have a single function and are only applicable to a single model, unable to meet the testing requirements of multiple models simultaneously. Moreover, customized testing equipment is often required for the PCBA of different household appliances, which not only increases the production cost but also reduces the production efficiency. In addition, the existing testing devices have obvious deficiencies in scalability and data processing, and it is difficult to adapt to the market demand for the rapid replacement of household appliances. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a multi-functional testing device for general household appliance PCBA aiming at the above deficiencies in the prior art.

[0004] The purpose of the utility model is achieved through the following technical solutions: A multi-functional testing device for general household appliance PCBA includes a housing and a cover plate detachably connected to the housing; a placement cavity is formed between the cover plate and the housing; an expansion motherboard is arranged in the placement cavity; a plurality of card slots are arranged in the placement cavity; a plurality of acquisition boards are detachably connected in the placement cavity; the acquisition board is detachably connected to the card slot; after the acquisition board is connected to the card slot, the acquisition board is electrically connected to the expansion motherboard;

[0005] The housing is provided with a communication interface and a power interface; the communication interface and the power interface are respectively electrically connected to the expansion motherboard.

[0006] The utility model is further arranged such that the card slot includes an upper card slot arranged at the top of the placement cavity and a lower card slot arranged at the bottom of the placement cavity.

[0007] The utility model is further arranged such that an opening is provided at one end of the upper card slot close to the cover plate and one end of the lower card slot close to the cover plate; a guiding inclined surface is provided at the opening.

[0008] The utility model is further arranged such that a communication converter is provided between the expansion motherboard and the acquisition board.

[0009] The utility model is further arranged such that the acquisition board is provided with a point allocation module, a point interface module and a plurality of function modules; the function modules are electrically connected to the point interface module through the point allocation module; an MCU is arranged in the expansion motherboard; the MCU is electrically connected to the function modules.

[0010] The utility model is further configured that the functional module includes a DC current acquisition module and an AC current acquisition module.

[0011] The utility model is further configured that the functional module includes a DC voltage acquisition module and an AC voltage acquisition module.

[0012] The utility model is further configured that the functional module includes a DI detection module.

[0013] The utility model is further configured that the functional module includes a frequency acquisition and supply module.

[0014] The utility model is further configured that the functional module includes a relay module, a communication module and a discharge module.

[0015] The beneficial effects of the utility model: By arranging a plurality of acquisition boards, commands are sent to the required acquisition board according to the unique address of the acquisition board to read the collected data information. When the model to be tested changes, the expansion motherboard can call the resources of the corresponding acquisition board to cope with it, so as to achieve the general function of testing all home appliance PCBA products; at the same time, the slot method is adopted, and the acquisition boards can be flexibly increased or decreased, providing a hardware guarantee for parallel testing. Description of the Drawings

[0016] The utility model is further described with reference to the accompanying drawings. However, the embodiments in the drawings do not constitute any limitation to the utility model. For those of ordinary skill in the art, other drawings can be obtained according to the following drawings without creative efforts.

[0017] Figure 1 is the structural schematic diagram of the utility model;

[0018] Figure 2 is the structural schematic diagram of the utility model after hiding the cover plate;

[0019] Figure 3 is the structural schematic diagram of the utility model from another perspective after hiding the cover plate;

[0020] Figure 4 is the circuit schematic diagram of the utility model;

[0021] Figure 5 is the principle block diagram of the DC current acquisition module of the utility model;

[0022] Figure 6 is the principle block diagram of the AC current acquisition module of the utility model;

[0023] Figure 7 is the principle block diagram of the DC voltage acquisition module of the utility model;

[0024] Figure 8 is the principle block diagram of the AC voltage acquisition module of the present utility model;

[0025] Figure 9 is the principle block diagram of the DI detection module of the present utility model;

[0026] Figure 10 is the principle block diagram of the frequency acquisition supply module of the present utility model;

[0027] Figure 11 is the principle block diagram of the relay module of the present utility model;

[0028] Figure 12 is the principle block diagram of the communication module of the present utility model;

[0029] Figure 13 is the principle block diagram of the discharge module of the present utility model;

[0030] Figure 14 is the principle block diagram of the point allocation module of the present utility model;

[0031] Wherein: 1. Outer shell; 11. Placing cavity; 2. Cover plate; 3. Expansion motherboard; 4. Acquisition board; 51. Upper card slot; 62. Lower card slot; 7. Opening; 8. Guide inclined plane. Specific embodiments

[0032] The present utility model will be further described in conjunction with the following embodiments.

[0033] From Figures 1 to 4 it can be seen that a general household appliance PCBA multi-functional test device described in this embodiment includes an outer shell 1 and a cover plate 2 detachably connected to the outer shell 1; a placing cavity 11 is formed between the cover plate 2 and the outer shell 1; an expansion motherboard 3 is provided in the placing cavity 11; a plurality of card slots are provided in the placing cavity 11; a plurality of acquisition boards 4 are detachably connected in the placing cavity 11; the acquisition boards 4 are detachably connected to the card slots; after the acquisition boards 4 are connected to the card slots, the acquisition boards 4 are electrically connected to the expansion motherboard 3;

[0034] The outer shell 1 is provided with a communication interface and a power interface; the communication interface and the power interface are respectively electrically connected to the expansion motherboard 3.

[0035] Specifically, for the general household appliance PCBA multi-functional test device described in this embodiment, when installing the acquisition board 4, by disassembling the cover plate 2 from the housing 1 and then inserting the acquisition board 4 into the card slot, the installation of the acquisition board 4 can be completed, and the acquisition board 4 is electrically connected to the expansion motherboard 3. Since each acquisition board 4 has a unique communication address, the expansion motherboard 3 can send commands to the required acquisition board 4 according to the needs of the model under test to read the collected data information through the unique address of the acquisition board 4. When the model under test changes, the expansion motherboard 3 can retrieve the resources of the corresponding acquisition board 4 to handle it, thus achieving the general function of testing all household appliance PCBA products; at the same time, using the card slot method, the acquisition board 4 can be flexibly increased or decreased, providing a hardware guarantee for parallel testing.

[0036] For a general household appliance PCBA multi-functional test device described in this embodiment, the card slot includes an upper card slot 51 provided at the top of the placement cavity 11 and a lower card slot 62 provided at the bottom of the placement cavity 11.

[0037] Specifically, through the above settings, the acquisition board 4 is stably and reliably connected to the placement cavity 11.

[0038] For a general household appliance PCBA multi-functional test device described in this embodiment, openings 7 are provided at one end of the upper card slot 51 close to the cover plate 2 and one end of the lower card slot 62 close to the cover plate 2; a guiding inclined surface 8 is provided in the opening 7. Through the above settings, it is convenient to insert the acquisition board 4 into the upper card slot 51 and the lower card slot 62.

[0039] For a general household appliance PCBA multi-functional test device described in this embodiment, a communication converter is provided between the expansion motherboard 3 and the acquisition board 4. Through the above settings, it is convenient for the expansion motherboard 3 and the acquisition board 4 to perform wireless communication.

[0040] For a general household appliance PCBA multi-functional test device described in this embodiment, the acquisition board 4 is provided with a point allocation module, a point interface module, and a plurality of function modules; the function modules are electrically connected to the point interface module through the point allocation module; an MCU is provided in the expansion motherboard 3; the MCU is electrically connected to the function modules.

[0041] For a general household appliance PCBA multi-functional test device described in this embodiment, the function modules include a DC current acquisition module and an AC current acquisition module. Specifically, through the above settings, the DC current value and the AC current value of the PCBA can be acquired.

[0042] Figure 5The principle block diagram of the DC current acquisition module: A sampling resistor is used to sample and convert it into a DC voltage. The converted DC voltage undergoes signal conditioning (filtering, voltage division), then goes to an instrumentation amplifier for differential amplification, and then is subjected to analog-to-digital conversion by an ADC and sent to the MCU for parsing its value to obtain the DC current value.

[0043] Figure 6 The principle block diagram of the AC current acquisition module. The principle is that the AC current becomes a small AC voltage after passing through a current transformer. Then the small AC voltage is converted into a DC voltage by an RMS-DC converter. Next, the converted DC voltage undergoes signal conditioning (filtering, voltage division), then goes to an instrumentation amplifier for differential amplification, and then is subjected to analog-to-digital conversion by an ADC and sent to the MCU for parsing its value to obtain the AC current value.

[0044] A general household appliance PCBA multi-functional test device described in this embodiment. The functional modules include a DC voltage acquisition module and an AC voltage acquisition module. Specifically, through the above settings, the DC voltage value and AC voltage value of the PCBA can be acquired.

[0045] Figure 7 The principle block diagram of the DC voltage acquisition module. The principle is that the DC voltage undergoes signal conditioning (filtering, voltage division), then goes to an instrumentation amplifier for differential amplification, and then is subjected to analog-to-digital conversion by an ADC and sent to the MCU for parsing its value to obtain the DC voltage value.

[0046] Figure 8 The principle block diagram of the AC voltage acquisition module. The principle is that the AC voltage undergoes signal conditioning (filtering, voltage division), then becomes a small AC voltage through a voltage transformer, and then the small AC voltage is converted into a DC voltage by an RMS-DC converter. Next, the converted DC voltage undergoes signal conditioning (filtering, voltage division), then goes to an instrumentation amplifier for differential amplification, and then is subjected to analog-to-digital conversion by an ADC and sent to the MCU for parsing its value to obtain the AC voltage value.

[0047] A general household appliance PCBA multi-functional test device described in this embodiment. The functional modules include a D I detection module. Specifically, through the above settings, the D I signal of the PCBA can be acquired. Figure 9It is the principle block diagram of the DI detection module. Its principle is as follows: The external signal is output to the input end of the dual-opto-coupler (one end is the common end, and the other end is the signal end to be measured), controlling the opto-coupler. The output end of the opto-coupler is sent to the IO port of the MCU via the interface IC for determining the high and low levels, thereby determining the state of the external signal. This DI acquisition module is provided with 4 groups of common ends for external signals to use, to detect their states with different voltages and GND. That is, when the signal to be detected is a low level (GND), the common end inputs a voltage (such as 5V, 12V, 3.3V, etc.), and the other end inputs a low-level signal to drive the opto-coupler to act, and the MCU side can detect its level state. Similarly, when the signal to be detected is a voltage, a low voltage (GND) can be input at the common end, and a voltage signal is input at the other end to drive the opto-coupler to act, and the MCU side can detect its level state.

[0048] A general household appliance PCBA multi-functional test device described in this embodiment, the function module includes a frequency acquisition and supply module. Specifically, through the above settings, the frequency of the PCBA can be acquired, and a pulse frequency can be provided to the PCBA. Figure 10 It is the principle block diagram of the frequency acquisition and supply module. Its principle is that the frequency signal of the PCBA to be measured is subjected to signal conditioning (low-pass filtering), and then passes through a comparator. The output of the comparator is input to the MCU, and then the MCU performs counting and statistical calculations to obtain its frequency and duty cycle, thereby completing the acquisition of the frequency. The supply of the frequency is that the DAC in the MCU passes through signal conditioning (low-pass filtering) and then through an operational amplifier for voltage superposition to complete voltage offset, and finally a frequency signal is output by a hysteresis comparator. The magnitude and duty cycle of the frequency are controlled by the output of the DAC in the MCU to complete. In this way, this module can complete the frequency acquisition of the PCBA to be measured or load a frequency signal to the module to be measured.

[0049] A general household appliance PCBA multi-functional test device described in this embodiment, the function module includes a relay module, a communication module, and a discharge module.

[0050] Figure 11 It is the principle block diagram of the relay module. Its principle is as follows: The IO port signal of the MCU controls the opto-coupler through an interface IC such as 74HC245. The output end of the opto-coupler then passes through the interface IC and then goes to the driver IC. The driver IC controls the relay, and the common end, normally open end, and normally closed end of the relay are output to the points on the point interface module. Thus, the relay module can be used to implement the conditional loading (short circuit, resistance) of the points of the PCBA to be measured.

[0051] Figure 12It is a schematic diagram of the principle of the communication module. The principle is as follows: An integrated infrared receiver, infrared transmitter, Bluetooth transceiver module, WIFI transceiver module, and isolated serial port module are integrated to meet the infrared communication, Bluetooth communication, WIFI communication, and serial port communication requirements of the PCBA product of the household appliance under test. The host can communicate with these communication modules respectively through a communication converter, so as to realize communication with the PCBA product of the household appliance under test.

[0052] Figure 13 It is a schematic diagram of the principle of the discharge module.

[0053] Figure 14 It is a schematic diagram of the principle of the point allocation module, which includes a point interface module, a point function selection module, a decoder module, and an MCU. Among them, the point interface module is docked with the test points of the PCBA of the household appliance under test; the point function selection module uses mechanical or solid-state relays for function selection; the decoder module uses a BCD decoder to control 300 relays without occupying too many IO ports of the MCU, and this method is not available in the current household appliance PCBA test industry; the MCU provides control IO to control BCD for encoding. In this way, the functions of 300 points can be arbitrarily allocated, and the problem of low versatility caused by the limitation of hardware resources is solved.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A general household appliance PCBA multifunctional testing device, characterized by: The invention comprises a shell (1) and a cover plate (2) detachably connected to the shell (1); a placement cavity (11) is formed between the cover plate (2) and the shell (1); an expansion motherboard (3) is arranged in the placement cavity (11); a plurality of card slots are arranged in the placement cavity (11); a plurality of acquisition boards (4) are detachably connected in the placement cavity (11); the acquisition boards (4) are detachably connected to the card slots; after the acquisition boards (4) are connected to the card slots, the acquisition boards (4) are electrically connected to the expansion motherboard (3); The housing (1) is provided with a communication interface and a power interface; the communication interface and the power interface are electrically connected to the expansion motherboard (3) respectively.

2. A general household appliance PCBA multifunctional testing device according to claim 1, characterized in that: The card slot comprises an upper card slot (51) arranged at the top of the placement cavity (11) and a lower card slot (62) arranged at the bottom of the placement cavity (11).

3. A general household appliance PCBA multifunctional testing device according to claim 2, characterized in that: An end of the upper clamping groove (51) close to the cover plate (2) and an end of the lower clamping groove (62) close to the cover plate (2) are both provided with an opening (7); and the opening (7) is provided with a guiding inclined surface (8).

4. A general household appliance PCBA multifunctional testing device according to claim 1, characterized in that: A communication converter is provided between the expansion motherboard (3) and the acquisition board (4).

5. A general household appliance PCBA multifunctional testing device according to claim 1, characterized in that: The acquisition board (4) is provided with a point allocation module, a point interface module and a plurality of functional modules; the functional module is electrically connected to the point interface module via the point allocation module; the expansion motherboard (3) is provided with an MCU; the MCU is electrically connected to the functional module.

6. A general household appliance PCBA multifunctional testing device according to claim 5, characterized in that: The functional modules include a DC current acquisition module and an AC current acquisition module.

7. A general household appliance PCBA multifunctional testing device according to claim 5, characterized in that: The functional modules include a DC voltage acquisition module and an AC voltage acquisition module.

8. A general household appliance PCBA multifunctional testing device according to claim 5, characterized in that: The functional module includes a DI detection module.

9. A general household appliance PCBA multifunctional testing device according to claim 5, characterized in that: The functional module includes a frequency acquisition and supply module.

10. A general household appliance PCBA multifunctional testing device according to claim 5, characterized in that: The functional modules include a relay module, a communication module and a discharge module.

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