A test motherboard circuit adaptable to various PCB board tests

Abstract

This utility model provides a test motherboard circuit adaptable to testing various PCB boards, including a power supply module for providing power to the entire circuit; a PCB power output module: its input terminal is connected to the output terminal of the power supply module, used to provide a power supply voltage compatible with the PCB board under test; a main control module: equipped with test software to implement testing of various PCB boards; a communication module: connected to the main control module for communicating with the PCB board under test; an input / output module: connected to the main control module for detecting test signals and sending test commands; a relay drive module: equipped with one or more drive modules, the input terminal of which is connected to the output terminal of the main control module for controlling multiple relays; and relays: used to control the power on / off or level signal conversion of the fixture or PCB board. The advantages of this utility model are: it can be compatible with testing of various PCB boards, effectively reducing development costs and time.

Description

Technical Field

[0001] This utility model relates to the field of circuit board testing technology, specifically to a test motherboard circuit that is compatible with testing various PCB boards. Background Technology

[0002] Printed circuit boards (PCBs) are widely used in various industries. In the current technology, different PCBs have different functions. When it is necessary to test the PCB, it is necessary to develop a test motherboard corresponding to the PCB for testing. This cannot be compatible with the testing of multiple PCBs, and the development cost is high. Utility Model Content

[0003] To address the problems in the existing technology, this utility model provides a test motherboard circuit that is compatible with various PCB board tests.

[0004] This utility model provides a test motherboard circuit compatible with various PCB board testing methods, including:

[0005] Power module: Provides power to the entire circuit;

[0006] PCB power supply output module: The input terminal is connected to the output terminal of the power module to provide a power supply voltage that is compatible with the operation of the PCB board under test;

[0007] Main control module: Equipped with testing software to perform tests on various PCB boards;

[0008] Communication module: Connected to the main control module, used for communication with the PCB board under test;

[0009] Input / output module: Connected to the main control module, used for test signal detection and sending test commands;

[0010] Relay drive module: It is provided with one or more drive modules. The input terminal of the relay drive module is connected to the output terminal of the main control module and is used to control multiple relays.

[0011] Relays: Used to control the power supply to fixtures or PCBs, or to switch power levels.

[0012] Furthermore, the communication module includes one or more of the following: SPI communication unit, RS485 / CAN communication unit, and USB communication unit.

[0013] Furthermore, the input / output module includes multiple or all of the following: an IO isolated input unit, an RS232 to USB input unit, an I2C expansion unit, a serial port input unit, an ADC acquisition input unit, and a PWM output unit.

[0014] Furthermore, the input / output module also includes several reserved external I / O pins led out from the main control module.

[0015] Furthermore, the power module also includes a programmable power output unit for providing a current and voltage source for PCB board testing.

[0016] Furthermore, the programmable power output unit outputs 3.3V power, and the power module also includes an external 3.3V power input interface.

[0017] Furthermore, the power module includes a power interface, a first filter unit, a first isolation unit, a step-up / step-down unit, a PCB power output adjustment unit, a second filter unit, and an electrostatic discharge protection unit arranged sequentially along the current direction. The output terminal of the first isolation unit is also provided with a 12V voltage output unit and several sets of output pads connected to the output terminal of the 12V voltage output unit.

[0018] Furthermore, the buck-boost unit includes a voltage regulator chip U2, and the PCB power supply output adjustment unit includes a resistor RF6 and a resistor RF5 connected in series. The feedback pin 3 of the voltage regulator chip U2 is connected between the resistor RF6 and the resistor RF5. By changing the resistance value of the resistor RF5, the output voltage VDD of the power module is adjusted.

[0019] Furthermore, the PCB power supply output module includes a power supply interface J2 and an inductor B1, wherein pin 1 of the interface J2 is grounded, and pin 2 is connected to the output voltage VDD through the series-connected inductor B1.

[0020] Furthermore, the drive module includes eight drive branches connected to eight output terminals of the main control module, and also includes optocouplers U9 and U10, and a drive interface CON1 connected to the output terminals of optocouplers U9 and U10 respectively. Each drive branch is provided with a first resistor, a first indicator light, and a second resistor. One end of the first resistor is connected to the positive terminal of the first indicator light and the output terminal of the main control module respectively. The output terminal of the first resistor is connected to the first input terminal of the optocoupler. The negative terminal of the first indicator light is grounded through the second resistor. Optocouplers U9 and U10 are each provided with four input terminals and four output terminals. The four input terminals of optocoupler U9 are connected to the first to fourth drive branches respectively, and the four input terminals of optocoupler U10 are connected to the fifth to eighth drive branches respectively.

[0021] Compared with the prior art, the beneficial effects of this utility model are: the test motherboard hardware of this utility model achieves compatibility testing of various PCB boards mainly through the following three aspects, thereby saving the R&D cycle, greatly reducing R&D costs, and improving testing efficiency.

[0022] 1. Since the product under test needs to be powered on, the output voltage of this utility model is adjustable. It outputs a power supply voltage that is compatible with the PCB board through the PCB power supply output module, thereby being compatible with the power supply requirements of different products.

[0023] 2. Set up communication modules for various PCB boards, as well as input / output modules for various test signal detection and test command transmission, so as to realize communication between the main control module and the product under test, data acquisition and detection, and meet the communication needs of different products;

[0024] 3. By setting multiple relays, the power supply to the test fixture or the product under test can be switched on or off or the level signal can be converted, thus fulfilling the power conversion requirements and realizing the test process such as voltage, current or power on / off control of the product under test. Attached Figure Description

[0025] To more clearly illustrate the solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is a structural block diagram of the present utility model;

[0027] Figure 2 This is a circuit schematic diagram of an embodiment of the power module, PCB power output module and I2C expansion unit of this utility model;

[0028] Figure 3 A circuit schematic diagram of an embodiment of an I / O isolated input unit;

[0029] Figure 4 This is a circuit schematic diagram of an embodiment of a relay drive circuit;

[0030] Figure 5 This is a schematic diagram of a relay output circuit.

[0031] Figure 6 This is a circuit schematic diagram of an embodiment of an RS232 to USB input unit;

[0032] Figure 7 This is a schematic diagram of the RS485 / CAN communication unit, TYPEC interface, and buzzer driver circuit. Detailed Implementation

[0033] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, and accompanying drawings are used to distinguish different objects, not to describe a particular order.

[0034] In this invention, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment to other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this invention can be combined with other embodiments.

[0035] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0036] like Figure 1 As shown, the present invention provides a test motherboard circuit adapted to various PCB board tests, including a power module, a main control module, a communication module, an input / output module, a relay drive module, and several relays driven by the relay drive module.

[0037] To achieve compatibility testing for various PCB boards, three main challenges need to be overcome: signal detection, power supply compatibility, and power control for various fixtures and PCB boards. This example, through circuit optimization, reduces the development cycle and cost, enabling a single motherboard to be compatible with various PCB board tests. Specifically, the power module in this example provides power to the entire circuit; the input terminal of the PCB power supply output module is connected to the output terminal of the power module to provide a power voltage compatible with the PCB board under test; the main control module can program different test software and control various hardware components to achieve testing of various PCB boards; the communication module is connected to the main control module for communication with the PCB board under test; the input / output module is connected to the main control module for test signal detection and sending test commands; the relay drive module in this example has one or more drive modules, and the input terminal of the relay drive module is connected to the output terminal of the main control module to control multiple relays; relays are used to control the power on / off of fixtures or PCB boards or the conversion of power levels.

[0038] The main control module in this example includes a main control chip, a clock circuit, a reset circuit, and a programming interface. The main control chip is preferably a GD32 series microcontroller, which has rich interfaces and powerful performance.

[0039] like Figure 2 As shown, in this example, the power module is connected to an external 12V power supply via power interface J1. After filtering by capacitor C12, the output is sent to diode D2. The diode isolates the circuit from the external power supply. Diode D2 outputs two paths: one 12V power supply provides power to power interfaces J3 and J17 for 12V output; this example provides pads for eight external 12V outputs. The other path, after being processed by a buck-boost unit, outputs an adjustable voltage to power subsequent stages and the PCB power output module.

[0040] The buck-boost unit in this example includes a voltage regulator chip U2, and the PCB power output adjustment unit includes resistors RF6 and RF5 connected in series. The feedback pin 3 of the voltage regulator chip U2 is connected between resistors RF6 and RF5. By changing the resistance value of RF5, the output voltage VDD of the power module is adjusted. In this example, resistor RF5 is preferably a surface-mount resistor that can be replaced as needed.

[0041] The PCB power supply output module includes a power supply interface J2 and an inductor B1. Pin 1 of the interface J2 is grounded, and pin 2 is connected to the output voltage VDD through the series-connected inductor B1.

[0042] The power module also includes a programmable power output unit, used to provide the current and voltage source for PCB board testing. In this example, the programmable power output unit outputs 3.3V power. An external 3.3V power input interface is also provided near the test motherboard and the programmable power output unit for programmable power output. Of course, in this example, a step-down chip can also be used to convert the voltage to 3.3V for use by the programmable power supply.

[0043] like Figures 2-3 , Figures 6-7 As shown, the communication module in this example includes an SPI communication unit, an RS485 / CAN communication unit, and a USB communication unit, which are compatible with mainstream communication protocols and meet the communication needs of different motherboards and main control modules.

[0044] The input / output module in this example includes an I / O isolated input unit, an RS232 to USB input unit, an I2C expansion unit, a serial port input unit, an ADC acquisition input unit, and a PWM output unit. The ADC acquisition input unit acquires the test signal from the product under test, while the I / O isolated input unit is used for acquiring input signals. By setting up diverse signal detection methods such as the RS232 to USB input unit, I2C expansion unit, serial port input unit, and PWM output unit, compatibility with signal acquisition, detection, and test command issuance for various PCB boards can be achieved. Preferably, the input / output module in this example also includes several reserved external I / O pins led out from the main control module. When the current interface cannot meet the test requirements, the corresponding input / output ports can be further expanded.

[0045] like Figure 4 and Figure 5 As shown, this example includes a relay drive circuit comprising two sets of drive modules. The first set of drive modules includes eight drive branches connected to eight output terminals of the main control module, and also includes optocouplers U9 and U10, and a drive interface CON1 connected to the output terminals of optocouplers U9 and U10. Each drive branch is equipped with a first resistor, a first indicator light, and a second resistor. One end of the first resistor is connected to the positive terminal of the first indicator light and the output terminal of the main control module, and the output terminal of the first resistor is connected to the first input terminal of the optocoupler. The negative terminal of the first indicator light is grounded through the second resistor. Optocouplers U9 and U10 each have four input terminals and four output terminals. The four input terminals of optocoupler U9 are connected to the first to fourth drive branches, and the four input terminals of optocoupler U10 are connected to the fifth to eighth drive branches. The first indicator light can visually indicate the operating status of each relay.

[0046] Correspondingly, in this example, the relay output circuit is connected to the drive interface CON1 of the first drive module through interface CON7. Eight relays K1-K8 are connected in parallel to the output terminal of interface CON7, and the relay commands are output through power pins B2-B15 respectively.

[0047] Compared with the prior art, the beneficial effects of this utility model are: the test motherboard hardware of this utility model achieves compatibility testing of various PCB boards mainly through the following three aspects, thereby saving the R&D cycle, greatly reducing R&D costs, and improving testing efficiency.

[0048] 1. Since the product under test needs to be powered on, the output voltage of this utility model is adjustable. It outputs a power supply voltage that is compatible with the PCB board through the PCB power supply output module, thereby being compatible with the power supply requirements of different products.

[0049] 2. Set up communication modules for various PCB boards, as well as input / output modules for various test signal detection and test command transmission, so as to realize communication between the main control module and the product under test, data acquisition and detection, and meet the communication needs of different products;

[0050] By setting up multiple relays, the power supply to the test fixture or the product under test can be switched on or off, or the level signal can be converted, thus fulfilling the power conversion requirements and enabling the testing process such as voltage, current, or power-on / off control of the product under test.

[0051] The specific embodiments described above are preferred embodiments of this utility model, and are not intended to limit the specific scope of this utility model. The scope of this utility model includes but is not limited to the specific embodiments described above. All equivalent changes made in accordance with this utility model are within the protection scope of this utility model.

Claims

1. A test motherboard circuit adaptable to various PCB board tests, characterized in that, include: Power module: Provides power to the entire circuit; PCB power supply output module: The input terminal is connected to the output terminal of the power module to provide a power supply voltage that is compatible with the operation of the PCB board under test; Main control module: Equipped with testing software to perform tests on various PCB boards; Communication module: Connected to the main control module, used for communication with the PCB board under test; Input / output module: Connected to the main control module, used for test signal detection and sending test commands; Relay drive module: It is provided with one or more drive modules. The input terminal of the relay drive module is connected to the output terminal of the main control module and is used to control multiple relays. Relays: Used to control the power supply to fixtures or PCBs, or to switch power levels.

2. The test mainboard circuit for adapting to test of multiple PCB boards according to claim 1, wherein: The communication module includes one or more of the following: SPI communication unit, RS485 / CAN communication unit, and USB communication unit.

3. The test mainboard circuit for adapting to test of multiple PCB boards according to claim 1, wherein: The input / output module includes multiple or all of the following: IO isolated input unit, RS232 to USB input unit, I2C expansion unit, serial port input unit, ADC acquisition input unit, and PWM output unit.

4. The test mainboard circuit adapted to test a plurality of PCB boards according to claim 3, wherein: The input / output module also includes several reserved external I / O pins led out from the main control module.

5. The test mainboard circuit for adapting to test of multiple PCB boards according to claim 1, wherein: The power module also includes a programmable power output unit, which provides a current and voltage source for PCB board testing.

6. The test mainboard circuit adapted to test a plurality of PCB boards according to claim 5, wherein: The programmable power output unit outputs 3.3V power, and the power module also includes an external 3.3V power input interface.

7. The test motherboard circuit adapted for testing a plurality of PCB boards according to any one of claims 1-5, wherein: The power module includes a power interface, a first filter unit, a first isolation unit, a step-up / step-down unit, a PCB power output adjustment unit, a second filter unit, and an electrostatic discharge protection unit arranged sequentially along the current direction. The output terminal of the first isolation unit is further provided with a 12V voltage output unit and several sets of output pads connected to the output terminal of the 12V voltage output unit.

8. The test mainboard circuit adapted to test a plurality of PCB boards according to claim 7, wherein: The buck-boost unit includes a voltage regulator chip U2, and the PCB power supply output adjustment unit includes a resistor RF6 and a resistor RF5 connected in series. The feedback pin of the voltage regulator chip U2 is connected between the resistor RF6 and the resistor RF5. By changing the resistance value of the resistor RF5, the output voltage VDD of the power module is adjusted.

9. The test motherboard circuit adapted for testing a plurality of PCB boards of claim 8, wherein: The PCB power supply output module includes a power supply interface J2 and an inductor B1. The first pin of the interface J2 is grounded, and the second pin is connected to the output voltage VDD through the series-connected inductor B1.

10. The test mainboard circuit adapted to test a plurality of PCB boards according to any one of claims 1-5, characterized in that: The drive module includes eight drive branches connected to eight output terminals of the main control module, and also includes optocouplers U9 and U10, and a drive interface CON1 connected to the output terminals of optocouplers U9 and U10. Each drive branch is provided with a first resistor, a first indicator light, and a second resistor. One end of the first resistor is connected to the positive terminal of the first indicator light and the output terminal of the main control module, and the output terminal of the first resistor is connected to the first input terminal of the optocoupler. The negative terminal of the first indicator light is grounded through the second resistor. Optocouplers U9 and U10 are each provided with four input terminals and four output terminals. The four input terminals of optocoupler U9 are connected to the first to fourth drive branches, and the four input terminals of optocoupler U10 are connected to the fifth to eighth drive branches.

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