A crosstalk-resistant isolated CBCT control signal harness and CBCT equipment

Abstract

This utility model relates to the field of CBCT technology, specifically to an anti-crosstalk isolated CBCT control signal harness, including a main control board harness, a signal isolation circuit board, and a device harness. The main control board harness connects the main control board and the signal isolation circuit board, sharing EGND with the main control board. The device harness connects the device and the signal isolation circuit board, sharing GND with the device, with EGND and GND electrically isolated. The signal isolation circuit board integrates an I / O signal isolation circuit with a high-speed optocoupler and a serial port signal isolation circuit, with the high-speed optocoupler matching the MCU communication rate. This utility model effectively solves the signal crosstalk problem caused by the numerous and complex wiring harnesses inside the CBCT equipment through electrical isolation, improving the stability and reliability of the main control board control signals, ensuring normal imaging of the equipment, and improving the electromagnetic compatibility characteristics of the entire machine.

Description

Technical Field

[0001] This utility model belongs to the technical field of CBCT (cone beam computed tomography) imaging equipment, and particularly relates to an anti-crosstalk isolated CBCT control signal harness and CBCT equipment. Background Technology

[0002] CBCT uses X-ray technology to display 3D model images of the object being irradiated on a host computer. The CBCT equipment is equipped with multiple stepper motors to move various devices and achieve multi-angle projection, making the 3D model images more detailed.

[0003] A CBCT comprises various devices, including stepper motors, DC brushed motors, X-ray imaging systems, switching power supplies, and displays. All these devices require a centralized control system, known as the main control board. This main control board controls the other devices within the CBCT via signal harnesses. These control signal harnesses transmit control commands and sensor data through electrical wires, coordinating the operation of each system within the CBCT to complete the imaging process.

[0004] Wire harnesses come in many types, including power wires (thicker wires capable of carrying high current), CAN and USART communication harnesses (used for communication control between devices and the main control board), and I / O control harnesses (outputting high and low level signals to control the status of various devices). When these harnesses are clustered together, crosstalk may occur between them during operation, leading to malfunctions.

[0005] CBCT systems are complex, with control lines for each device connected to the mainboard. Due to the large number of devices and complex wiring harnesses on a CBCT, especially signal lines, they are very susceptible to crosstalk. Crosstalk can generate noise that interferes with the main control board's control of other devices, thus preventing normal imaging.

[0006] Therefore, there is an urgent need to design a CBCT control signal harness that can effectively solve the problem of signal crosstalk in various devices. Utility Model Content

[0007] To address the aforementioned problems in the existing technology, this utility model provides an anti-crosstalk isolated CBCT control signal harness and CBCT equipment. By using isolated control signal transmission, it achieves reliable signal transmission, ensures the electrical safety of the entire system, avoids signal crosstalk, and makes the main control board's signal transmission and reception more stable, resulting in accurate imaging.

[0008] To achieve the above objectives, this utility model provides the following technical solution:

[0009] A crosstalk-resistant isolated CBCT control signal harness includes a main control board harness, a signal isolation circuit board, and a device harness. One end of the main control board harness is connected to the CBCT's main control board connector, and the other end is connected to the signal isolation circuit board. The signal transmitted by the main control board harness shares a common ground with the main control board, forming EGND. One end of the device harness is connected to the CBCT's device connector, and the other end is connected to the signal isolation circuit board. The signal transmitted by the device harness shares a common ground with the device, forming GND. GND and EGND are electrically isolated. The signal isolation circuit board is a PCBA board, which integrates a signal isolation circuit. The signal isolation circuit includes an I / O signal isolation circuit for isolating I / O control signals and a serial port signal isolation circuit for isolating communication signals. Both the I / O signal isolation circuit and the serial port signal isolation circuit use high-speed optocouplers for signal isolation.

[0010] Furthermore, in this invention, the signal isolation circuit includes a high-speed optocoupler, a resistor, and a capacitor, wherein the communication rate of the high-speed optocoupler is matched with the communication rate of the MCU on the CBCT main control board.

[0011] Furthermore, in this invention, the I / O signal isolation circuit includes multiple isolation units, the input side of each isolation unit is connected to the I / O control signal port of the main control board, and the output side is connected to the corresponding signal receiving port of the device.

[0012] Furthermore, in this invention, when the I / O control signal on the main control board is high, the high-speed optocoupler is not turned on, and the corresponding signal on the device side is high; when the I / O control signal on the main control board is low, the high-speed optocoupler is turned on, and the corresponding signal on the device side is low.

[0013] Furthermore, in this invention, the serial port signal isolation circuit includes a first isolation unit and a second isolation unit. The first isolation unit is used for isolating signals output from the device end to the main control board end, and the second isolation unit is used for isolating signals output from the main control board end to the device end.

[0014] Furthermore, in this invention, the input side of the first isolation unit is connected to the signal output port of the device, and the output side of the first isolation unit is connected to the corresponding signal input port of the main control board; the input side of the second isolation unit is connected to the signal output port of the main control board, and the output side of the second isolation unit is connected to the corresponding signal input port of the device.

[0015] Furthermore, in this invention, when the signal sent by the device is high, the high-speed optocoupler is turned on, and the signal received by the main control board is low; when the signal sent by the device is low, the high-speed optocoupler is not turned on, and the signal received by the main control board is high; when the signal sent by the main control board is high, the high-speed optocoupler is turned on, and the signal received by the device is low; when the signal sent by the main control board is low, the high-speed optocoupler is not turned on, and the signal received by the device is high.

[0016] This utility model also provides a CBCT device, which includes the aforementioned anti-crosstalk isolated CBCT control signal harness.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] When signal lines are numerous and complex, easily leading to crosstalk, the isolated wiring harness of this invention can effectively prevent crosstalk between signals, reducing the impact of crosstalk from the device end to the main control board end. This allows the main control board to correctly control the normal operation of each device, thereby ensuring normal imaging. Furthermore, the isolated signal wiring harness also effectively improves the overall EMC (electromagnetic compatibility) characteristics of the device. Attached Figure Description

[0019] The specific embodiments of this utility model will be further explained below with reference to the accompanying drawings.

[0020] Figure 1 This is a system block diagram of the anti-crosstalk isolated CBCT control signal harness of this utility model.

[0021] Figure 2 This is a schematic diagram of the main control board end harness in the anti-crosstalk isolated CBCT control signal harness of this utility model.

[0022] Figure 3 This is a schematic diagram of the device-end wiring harness in the anti-crosstalk isolation CBCT control signal harness of this utility model.

[0023] Figure 4 This is a schematic diagram of the I / O signal isolation circuit in the anti-crosstalk isolated CBCT control signal harness of this utility model.

[0024] Figure 5 This is a schematic diagram of the serial port signal isolation circuit in the anti-crosstalk isolation CBCT control signal harness of this utility model. Detailed Implementation Example 1

[0025] Combination Figure 1 , Figure 2 and Figure 3As shown, the anti-crosstalk isolated CBCT control signal harness in this embodiment includes a main control board harness, a signal isolation circuit board, and a device harness. One end of the main control board harness is connected to the CBCT's main control board connector, and the other end is connected to the signal isolation circuit board. The main control board harness typically transmits power signals, I / O control signals, and communication signals. The signals transmitted by the main control board harness share a common ground with the main control board, forming EGND. One end of the device harness is connected to the CBCT's device connector, and the other end is connected to the signal isolation circuit board. The device-side wiring harness typically transmits power signals, I / O control signals, and communication signals. The signals transmitted by the device-side wiring harness share a common ground with the device, forming GND. GND is electrically isolated from EGND. The signal isolation circuit board is a PCBA circuit board, which integrates signal isolation circuitry. The signal isolation circuitry includes an I / O signal isolation circuit for isolating I / O control signals and a serial port signal isolation circuit for isolating communication signals. Both the I / O signal isolation circuitry and the serial port signal isolation circuitry use high-speed optocouplers to achieve signal isolation.

[0026] Preferably, in this invention, the signal isolation circuit includes a high-speed optocoupler, a resistor, and a capacitor, wherein the communication rate of the high-speed optocoupler matches the communication rate of the MCU on the CBCT main control board.

[0027] Preferably, in this invention, the I / O signal isolation circuit includes multiple isolation units, with the input side of each isolation unit connected to the I / O control signal port of the main control board and the output side connected to the corresponding signal receiving port of the device.

[0028] Preferably, in this invention, when the I / O control signal on the main control board is high, the high-speed optocoupler is not turned on, and the corresponding signal on the device side is high; when the I / O control signal on the main control board is low, the high-speed optocoupler is turned on, and the corresponding signal on the device side is low.

[0029] Combination Figure 4 As shown, in this embodiment, VCC_5V is the main control board power supply, and AI_CLM_ENA and AI_CLM_COMMB are the main control board I / O control signals.

[0030] When AI_CLM_ENA and AI_CLM_COMMB are high, the high-speed optocoupler U2 is not turned on, and DR_CLM_ENA and DR_CLM_COMMB are high.

[0031] When AI_CLM_ENA and AI_CLM_COMMB are low, the high-speed optocoupler U2 is turned on, and DR_CLM_ENA and DR_CLM_COMMB are low.

[0032] DR_CLM_ENA and DR_CLM_COMMB are control signals received by the device, and the above are I / O control signals sent by the main control board.

[0033] Preferably, in this invention, the serial port signal isolation circuit includes a first isolation unit and a second isolation unit. The first isolation unit is used for isolating signals output from the device end to the main control board end, and the second isolation unit is used for isolating signals output from the main control board end to the device end.

[0034] Preferably, in this invention, the input side of the first isolation unit is connected to the signal output port of the device, and the output side of the first isolation unit is connected to the corresponding signal input port of the main control board; the input side of the second isolation unit is connected to the signal output port of the main control board, and the output side of the second isolation unit is connected to the corresponding signal input port of the device.

[0035] Preferably, in this invention, when the signal transmitted from the device is high, the high-speed optocoupler is turned on, and the signal received by the main control board is low; when the signal transmitted from the device is low, the high-speed optocoupler is not turned on, and the signal received by the main control board is high; when the signal transmitted from the main control board is high, the high-speed optocoupler is turned on, and the signal received by the device is low; when the signal transmitted from the main control board is low, the high-speed optocoupler is not turned on, and the signal received by the device is high.

[0036] Combination Figure 4 As shown, in this embodiment, Driver TX is the device-side signal output, Control TX is the main control board signal output, Control RX is the main control board signal input, Driver RX is the device-side signal input, VCC_5V is the main control board power supply, 5V is the device-side power supply, EGND is the main control board ground, and GND is the device-side ground.

[0037] When Driver TX is high, the upper end of the high-speed optocoupler U1 is turned on, and Control RX is low.

[0038] When Driver TX is low, the upper end of the high-speed optocoupler U1 is not conducting, and Control RX is high.

[0039] When Control TX is high, the lower end of the high-speed optocoupler U1 is turned on, and Driver RX is low.

[0040] When Control TX is low, the lower end of the high-speed optocoupler U1 is not conducting, and Driver RX is high.

[0041] At this point, isolated communication between the main control board and the device can be achieved.

[0042] The main control board and the device end are isolated from I / O and USART signals through an isolation circuit board, which achieves signal stability and avoids crosstalk problems on the wiring harness. Example 2

[0043] The CBCT device in this embodiment includes the anti-crosstalk isolated CBCT control signal harness as described in Embodiment 1.

[0044] The CBCT system isolates I / O signals and USART communication signals, effectively avoiding crosstalk caused by numerous wiring harnesses. Furthermore, the circuit designs for different signal transmissions are not the same. This isolated wiring harness makes the overall system's EMC (electromagnetic compatibility) characteristics better, resulting in accurate imaging.

[0045] Many specific details have been set forth in the above description to provide a full understanding of this utility model. However, the above description is only a preferred embodiment of this utility model, and this utility model can be implemented in many other ways different from those described herein. Therefore, this utility model is not limited to the specific embodiments disclosed above. Furthermore, any person skilled in the art can make many possible variations and modifications to the technical solution of this utility model using the methods and techniques disclosed above, or modify it into equivalent embodiments with equivalent changes, without departing from the scope of the technical solution of this utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model, without departing from the content of the technical solution of this utility model, shall still fall within the protection scope of the technical solution of this utility model.

Claims

1. A crosstalk immune isolated CBCT control signal harness, characterized in that: The system includes a main control board wiring harness, a signal isolation circuit board, and a device wiring harness. One end of the main control board wiring harness is connected to the CBCT main control board connector, and the other end is connected to the signal isolation circuit board. The signals transmitted by the main control board wiring harness share a common ground with the main control board, forming EGND. One end of the device wiring harness is connected to the CBCT device connector, and the other end is connected to the signal isolation circuit board. The signals transmitted by the device wiring harness share a common ground with the device, forming GND. GND and EGND are electrically isolated. The signal isolation circuit board is a PCBA circuit board, which integrates signal isolation circuitry. The signal isolation circuitry includes an I / O signal isolation circuit for isolating I / O control signals and a serial port signal isolation circuit for isolating communication signals. Both the I / O signal isolation circuitry and the serial port signal isolation circuitry use high-speed optocouplers to achieve signal isolation.

2. The cross-talk immune isolated CBCT control signal harness of claim 1, wherein: The signal isolation circuit includes a high-speed optocoupler, a resistor, and a capacitor. The communication rate of the high-speed optocoupler is matched with the communication rate of the MCU on the CBCT main control board.

3. The cross-talk immune isolated CBCT control signal harness of claim 1, wherein: The I / O signal isolation circuit includes multiple isolation units. The input side of each isolation unit is connected to the I / O control signal port of the main control board, and the output side is connected to the corresponding signal receiving port of the device.

4. The cross-talk immune isolated CBCT control signal harness of claim 3, wherein: When the I / O control signal on the main control board is high, the high-speed optocoupler is not turned on, and the corresponding signal on the device side is high; when the I / O control signal on the main control board is low, the high-speed optocoupler is turned on, and the corresponding signal on the device side is low.

5. The anti-crosstalk isolated CBCT control signal harness according to claim 1, characterized in that: The serial port signal isolation circuit includes a first isolation unit and a second isolation unit. The first isolation unit is used to isolate the signal output from the device to the main control board, and the second isolation unit is used to isolate the signal output from the main control board to the device.

6. The anti-crosstalk isolated CBCT control signal harness according to claim 5, characterized in that: The input side of the first isolation unit is connected to the signal output port of the device, and the output side of the first isolation unit is connected to the corresponding signal input port of the main control board; the input side of the second isolation unit is connected to the signal output port of the main control board, and the output side of the second isolation unit is connected to the corresponding signal input port of the device.

7. The anti-crosstalk isolated CBCT control signal harness according to claim 6, characterized in that: When the device sends a high-level signal, the high-speed optocoupler is turned on, and the main control board receives a low-level signal; when the device sends a low-level signal, the high-speed optocoupler is not turned on, and the main control board receives a high-level signal; when the main control board sends a high-level signal, the high-speed optocoupler is turned on, and the device receives a low-level signal; when the main control board sends a low-level signal, the high-speed optocoupler is not turned on, and the device receives a high-level signal.

8. A CBCT device, characterized in that: The device includes a crosstalk-resistant isolated CBCT control signal harness as described in any one of claims 1-7.

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