Connection display test system controlled by multi-channel relay

Abstract

The utility model relates to the field of display screen testing, and provides a connection display testing system controlled by a multi-channel relay in order to improve the testing efficiency, which comprises a display panel and an inner machine panel, four circuits to be tested are arranged on the display panel and are respectively a first power supply circuit, a second power supply circuit, a first communication circuit and a second communication circuit, the internal unit board is provided with four test circuits in one-to-one correspondence with to-be-tested circuits, the relay board is respectively connected with the display board and the internal unit board, the relay board is provided with four relay control circuits, and through the four independent relay control circuits, a standardized interface and a hardware state feedback design, the four independent relay control circuits are connected with the internal unit board. Full-automatic testing is achieved, and the testing efficiency and the testing coverage rate are remarkably improved.

Description

Technical Field

[0001] This utility model relates to the field of display screen testing, specifically a multi-channel relay-controlled connection display testing system. Background Technology

[0002] In factory testing of air conditioner display screens, both the power supply and communication lines must be tested simultaneously. The power supply includes 12V and 5V, and the communication lines include transmit (TX) and receive (RX) lines. Traditional methods rely on manual plugging and unplugging or mechanical switches to control the on / off state of the power supply and communication lines. These methods have the following drawbacks:

[0003] Inefficient: Manual operation is time-consuming and error-prone, and cannot meet the needs of mass production;

[0004] The test scenarios are limited, making it difficult to simulate complex operating conditions such as power outages and communication interference.

[0005] Poor compatibility: Different display models have different interfaces, requiring frequent replacement of test fixtures. Utility Model Content

[0006] To improve testing efficiency, this invention provides a multi-channel relay-controlled connection display testing system.

[0007] The technical solution adopted by this utility model to solve the above problems is:

[0008] A multi-channel relay-controlled connection display test system includes a display board and an internal unit board. The display board has four lines under test: a first power line, a second power line, a first communication line, and a second communication line. The internal unit board has four test lines corresponding one-to-one with the lines under test. The system also includes a host computer and a relay board. The relay board is connected to both the display board and the internal unit board. The relay board has four relay control circuits, which include:

[0009] The circuit consists of a first resistor, a second resistor, a third resistor, a first MOSFET, a second MOSFET, a relay, and a fixed power supply. The gate of the first MOSFET is connected to the host computer. One end of the first resistor is connected to the fixed power supply, and the other end is connected to the drain of the first MOSFET and the gate of the second MOSFET. The source of the second MOSFET is grounded, and its drain is connected to one end of the relay coil. The other end of the relay coil is connected to the fixed power supply through the second resistor. The test circuit is connected to the circuit under test through the normally open contact of the relay and the third resistor.

[0010] Furthermore, the relay control circuit also includes a diode connected in parallel across the relay coil.

[0011] Furthermore, the relay control circuit also includes a fourth resistor and an indicator light. One end of the indicator light is grounded, and the other end is connected to the first resistor through the fourth resistor.

[0012] Furthermore, the relay control circuit also includes a fifth resistor and a sixth resistor. One end of the fifth resistor is connected to the gate of the first MOSFET, and the other end is grounded. One end of the sixth resistor is connected to the gate of the second MOSFET, and the other end is grounded.

[0013] Furthermore, the voltage of the first power supply line is 12V, the voltage of the second power supply line is 5V, the first communication line is a transmitting line, and the second communication line is a receiving line.

[0014] Furthermore, the relay board is connected to the display board and the internal unit board via ribbon cables and reserved pin holes.

[0015] The advantages of this invention compared to the prior art are: through four independent relay control circuits, standardized interfaces and hardware status feedback design, fully automated testing is achieved, significantly improving testing efficiency and test coverage. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a relay control circuit. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0018] A multi-channel relay-controlled connection display test system includes a display board and an internal unit board. The display board has four lines under test: a first power line, a second power line, a first communication line, and a second communication line. The internal unit board has four test lines corresponding one-to-one with the lines under test. The system also includes a host computer and a relay board. The relay board is connected to both the display board and the internal unit board. The relay board has four relay control circuits, which include:

[0019] The circuit consists of a first resistor, a second resistor, a third resistor, a first MOSFET, a second MOSFET, a relay, and a fixed power supply. The gate of the first MOSFET is connected to the host computer. One end of the first resistor is connected to the fixed power supply, and the other end is connected to the drain of the first MOSFET and the gate of the second MOSFET. The sources of the first and second MOSFETs are both grounded. The drain of the second MOSFET is connected to one end of the relay coil. The other end of the relay coil is connected to the fixed power supply through the second resistor. The test circuit is connected to the circuit under test through the normally open contact of the relay and the third resistor.

[0020] In this embodiment, the voltage of the first power supply line is 12V, the voltage of the second power supply line is 5V, the first communication line is a transmitting line, and the second communication line is a receiving line.

[0021] Taking the second power supply line as an example, the relay control circuit is as follows: Figure 1 As shown, it includes:

[0022] The system consists of a first resistor R21, a second resistor R6, a third resistor R48, a first MOSFET Q8, a second MOSFET Q2, a relay RLY2, and a fixed power supply with a voltage of 5V. The model of the relay RLY2 is SRD-05VDC-SL-C. The gate of the first MOSFET Q8 is connected to the host computer to receive control signals from the host computer. One end of the first resistor R21 is connected to the fixed power supply, and the other end is connected to the drain of the first MOSFET Q8 and the gate of the second MOSFET Q2. The sources of the first MOSFET Q8 and the second MOSFET Q2 are both grounded. The drain of the second MOSFET Q2 is connected to one end of the relay coil, and the other end of the relay coil is connected to the fixed power supply through the second resistor R6. The second power supply line on the internal circuit board is connected to the second power supply line on the display board through the normally open contact of the relay and the third resistor R48.

[0023] To enable quick connection between the indoor unit board, display board and relay board, "+5V_SYS_IN" and "+5V_SYS_OUT" are connected to the actual equipment through the reserved pin header holes.

[0024] ① When the output signal A1 of the host computer is high, the drain and source of Q8 are connected, forming a low-impedance path, and the drain voltage of Q8 is pulled down to 0V. At this time, the gate of Q2 is also pulled low, Q2 is not conducting, no current flows through the relay coil, the coil switch will be switched to pin 3, R31 is in NC state, and the relay is in the open state.

[0025] ② When A1 is low, the drain and source of Q8 are not conducting. At this time, the gate of Q2 is pulled up to 5V through R21, the drain and source of Q2 are conducting, and current flows through the relay coil. The coil switch will be switched to pin 2. The "+5V_SYS_OUT" of pin 2 is wired to the actual device through the reserved pin header hole. At this time, the relay is in the closed working state.

[0026] The relay control circuits corresponding to the first power supply line, the first communication line, and the second communication line have the same structure as described above, and will not be repeated here.

[0027] Furthermore, the relay control circuit also includes a diode D1, which is connected in parallel across the relay coil. The diode absorbs the reverse voltage generated when the relay coil is de-energized, thus protecting the component.

[0028] Furthermore, the relay control circuit also includes a fourth resistor R4 and an indicator LED2. One end of the indicator LED is grounded, and the other end is connected to the first resistor R21 through the fourth resistor R4. The on / off status of the relay is fed back in real time through the LED indicator, which can monitor the on / off status of the circuit in real time.

[0029] Furthermore, the relay control circuit also includes a fifth resistor R20 and a sixth resistor R5. One end of the fifth resistor R20 is connected to the gate of the first MOSFET Q8, and the other end is grounded; one end of the sixth resistor R5 is connected to the gate of the second MOSFET Q2, and the other end is grounded. By setting up a pull-down resistor network, it is ensured that the MOSFETs are reliably turned off when there is no signal input, thus avoiding false triggering.

[0030] This invention achieves fully automated testing through four independent relay control circuits, standardized interfaces, and hardware status feedback design, significantly improving efficiency and test coverage.

Claims

1. A multi-channel relay-controlled connection display test system, comprising a display board and an internal unit board, wherein the display board is provided with four lines under test, namely a first power supply line, a second power supply line, a first communication line, and a second communication line, and the internal unit board is provided with four test lines corresponding one-to-one with the lines under test, characterized in that, It also includes a host computer and a relay board. The relay board is connected to the display board and the internal unit board respectively. The relay board is equipped with four relay control circuits, which include: The circuit consists of a first resistor, a second resistor, a third resistor, a first MOSFET, a second MOSFET, a relay, and a fixed power supply. The gate of the first MOSFET is connected to the host computer. One end of the first resistor is connected to the fixed power supply, and the other end is connected to the drain of the first MOSFET and the gate of the second MOSFET. The sources of the first and second MOSFETs are both grounded. The drain of the second MOSFET is connected to one end of the relay coil. The other end of the relay coil is connected to the fixed power supply through the second resistor. The test circuit is connected to the circuit under test through the normally open contact of the relay and the third resistor.

2. The multi-channel relay controlled coupling display test system of claim 1, wherein, The relay control circuit also includes a diode, which is connected in parallel across the relay coil.

3. The multi-channel relay controlled coupling display test system of claim 1, wherein, The relay control circuit also includes a fourth resistor and an indicator light. One end of the indicator light is grounded, and the other end is connected to the first resistor through the fourth resistor.

4. The multi-channel relay controlled coupling display test system of claim 1, wherein, The relay control circuit also includes a fifth resistor and a sixth resistor. One end of the fifth resistor is connected to the gate of the first MOSFET, and the other end is grounded. One end of the sixth resistor is connected to the gate of the second MOSFET, and the other end is grounded.

5. The multi-channel relay controlled coupling display test system of claim 1, wherein, The voltage of the first power supply line is 12V, the voltage of the second power supply line is 5V, the first communication line is the transmitting line, and the second communication line is the receiving line.

6. The multi-channel relay controlled coupling display test system according to any one of claims 1-5, wherein, The relay board is connected to the display board and the indoor unit board via ribbon cables and reserved pin holes.

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