Emc test device for a cbct apparatus

Abstract

The utility model provides a kind of EMC test device of CBCT equipment, including communication circuit, control panel and multiple energized loop, communication circuit is connected between host computer and control panel, control panel is connected with M electrical equipment to be measured in CBCT equipment.M is the integer greater than or equal to 4.The utility model provides a kind of EMC test device of CBCT equipment, without disassembly machine can quickly and accurately find out the electrical equipment of CBCT equipment that EMC test has influence.

Description

Technical Field

[0001] This utility model belongs to the field of test circuit technology, specifically, it relates to an EMC testing device for CBCT equipment. Background Technology

[0002] Cone-beam computed tomography (CBCT) equipment is equipped with multiple stepper motors to move various components and achieve multi-angle projection, making 3D model images more detailed. Before entering the market, CBCT equipment must undergo EMC testing, including RE (radiated emissions), CE (conducted emissions), harmonic scintillation, electrostatic discharge, transient pulse interference, etc., with CE and RE being the most challenging tests. CBCT equipment contains numerous electrical components, including 24V and 12V switching power supplies, stepper motor drivers, servo motors, high-voltage generators (X-ray generating devices), and image detectors (X-ray receiving devices), many of which can affect CE and RE testing. When problems occur in CE and RE testing, the CBCT equipment needs to be disassembled to inspect the internal electrical components one by one. Currently, a common method is to disconnect the power supply circuits of each electrical component individually, observe the test data, locate the problematic component, and rectify it. However, this method is inefficient, the CBCT equipment casing is cumbersome to disassemble and reassemble, significantly increasing testing time and reducing efficiency. Furthermore, frequent disassembly and reassembly can easily damage the casing. Disassembling or reassembling the power supply circuit wiring harness can also easily create electrical safety hazards and increase the risk of the machine exploding. Summary of the Invention

[0003] To address the aforementioned shortcomings, this invention provides an EMC testing device for CBCT equipment, which can quickly and accurately identify electrical components in the CBCT equipment that affect EMC testing without disassembling the equipment.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] This utility model provides an EMC testing device for CBCT equipment, including a communication circuit and a control board. The communication circuit is connected between a host computer and the control board, and the control board is connected to M electrical devices under test in the CBCT equipment; where M is an integer greater than or equal to 4.

[0006] As a further improvement of this utility model, the control board includes a power conversion circuit, an MCU control circuit, and M relay circuits. The power conversion circuit is connected to the communication circuit and the MCU control circuit, and is used to convert the external high voltage into the low voltage required by the MCU control circuit and the communication circuit. The communication circuit is connected between the MCU control circuit and the host computer. The M control output terminals of the MCU control circuit are respectively connected to the M relay circuits one by one, and the M relay circuits are respectively connected to the M electrical devices under test one by one.

[0007] As a further improvement of this utility model, the electrical equipment under test includes a servo motor, a stepper motor, a high-voltage generator, and an image detector.

[0008] As a further improvement of this utility model, the relay circuit includes a transistor and a relay. The base of the transistor is connected to the control output terminal of the MCU control circuit, the collector of the transistor is connected to the power supply voltage terminal through a resistor, and the emitter of the transistor is connected to the ground terminal. The collector of the transistor is connected to the control input terminal of the relay, the common terminal of the relay is connected to the external power supply, the normally open terminal of the relay is connected to the power input terminal of the electrical device under test, and the positive power supply terminal of the relay is connected to the power supply voltage terminal.

[0009] As a further improvement of this utility model, the external power supply in the relay circuit connected to the servo motor, stepper motor and image detector is 24V DC.

[0010] As a further improvement of this utility model, in the relay circuit connected to the high voltage generator, the external power supply is 220V AC.

[0011] Compared with the prior art, the technical solution of this utility model has the following beneficial effects:

[0012] This utility model provides an EMC testing device for CBCT equipment. When a problem occurs during EMC testing of the CBCT equipment, the host computer transmits control signals to the control board via a communication circuit. The control board observes the EMC test data by cutting off the power supply circuits of different electrical devices. If the EMC data passes the test after cutting off the power supply circuit of a certain electrical device, the problem can be identified as that electrical device. This device can quickly and accurately locate problems with electrical devices inside the CBCT equipment during EMC testing without disassembling the outer casing, saving testing time and avoiding the risk of damage to the plastic casing caused by disassembly. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the EMC testing device of the CBCT equipment according to an embodiment of the present invention;

[0014] Figure 2 yes Figure 1Circuit diagram of the control board;

[0015] Figure 3 yes Figure 2 Circuit diagram of the relay circuit connected to the high-voltage generator;

[0016] Figure 4 yes Figure 2 The circuit diagram of the relay circuit that connects to the servo motor, stepper motor and image detector.

[0017] Explanation of main component symbols

[0018] Transistor Q1

[0019] Resistor R1

[0020] Power supply voltage terminal VCC

[0021] ground terminal GND

[0022] Relay U1 Detailed Implementation

[0023] The technical solution of this utility model will now be described in detail with reference to the accompanying drawings.

[0024] This utility model embodiment provides an EMC testing device for CBCT equipment, such as... Figure 1 As shown, the device includes a communication circuit and a control board. The communication circuit is connected between the host computer and the control board, and the control board is connected to M electrical devices under test within the CBCT equipment. M is an integer greater than or equal to 4.

[0025] In this embodiment, the communication circuit adopts an RS232 communication circuit.

[0026] like Figure 2 As shown, the control board includes a power conversion circuit, an MCU control circuit, and M relay circuits. The power conversion circuit is connected to the communication circuit and the MCU control circuit, and is used to convert external high voltage to the low voltage required by the MCU control circuit and the communication circuit. In this embodiment, the power conversion circuit converts the DC 24V of the switching power supply to DC 5V and DC 3.3V. The communication circuit is connected between the MCU control circuit and the host computer, and is used to transmit instructions from the host computer to the MCU control circuit. The M control output terminals of the MCU control circuit are connected one-to-one with the M relay circuits, and the M relay circuits are connected one-to-one with the M electrical devices under test.

[0027] In this embodiment, the MCU control circuit includes an MCU control chip and a crystal oscillator circuit, a reset circuit, a power supply filter circuit, etc. connected to the periphery of the MCU control chip.

[0028] The relay circuit is used to control the power supply of the electrical device under test (DUT) in the CBCT equipment via control signals from the MCU control circuit. It controls high voltage with low voltage, and high current with low current, while providing electrical isolation. When the relay circuit is open, the input circuit voltage equals the output circuit voltage, and the connected DUT operates normally. When the relay circuit is closed, the output circuit voltage is 0V, and the connected DUT does not operate.

[0029] In this embodiment, the electrical device under test includes at least a servo motor, a stepper motor, a high-voltage generator, and an image detector.

[0030] like Figure 3 and Figure 4 As shown, the relay circuit includes a transistor Q1 and a relay U1. The base of transistor Q1 is connected to the control output terminal of the MCU control circuit. The collector of transistor Q1 is connected to the power supply voltage terminal VCC through a resistor R1. The emitter of transistor Q1 is connected to the ground terminal GND. The collector of transistor Q1 is connected to the control input terminal of relay U1. The common terminal of relay U1 is connected to the external power supply. The normally open terminal of relay U1 is connected to the power input terminal of the electrical device under test. The positive power supply terminal of the relay is connected to the power supply voltage terminal VCC.

[0031] like Figure 4 As shown, in the relay circuit connected to the servo motor, stepper motor, and image detector, the external power supply is 24V DC. Pins 5 and 6 of relay U1 are connected to the 24V DC external power supply and ground (GND) respectively, while pins 3 and 4 are connected to the servo motor as the power input for the stepper motor. When the MCU control circuit outputs a low level, transistor Q1 is cut off, the coil of relay U1 is not conducting (i.e., pins 5 and 3 are not conducting, pins 6 and 4 are not conducting), and the stepper motor does not work. When the MCU control circuit outputs a high level, transistor Q1 is turned on, the coil of relay U1 is turned on (i.e., pins 5 and 3 are conducting, pins 6 and 4 are conducting), and the stepper motor works.

[0032] like Figure 3 As shown, in the relay circuit connected to the high-voltage generator, the external power supply is 220V AC. Pins 5 and 6 are connected to the 220V AC external power supply, and pins 3 and 4 are connected to the high-voltage generator as its power input. When the MCU control circuit outputs a low level, transistor Q1 is cut off, the coil of relay U1 is not conducting, pins 5 and 3 are not conducting, pins 6 and 4 are not conducting, and the high-voltage generator does not work. When the MCU control circuit outputs a high level, transistor Q1 is turned on, the coil of relay U1 is turned on, that is, pins 5 and 3 are conducting, pins 6 and 4 are conducting, and the high-voltage generator works.

[0033] The working process of the EMC testing device for the aforementioned CBCT equipment is as follows:

[0034] If EMC data shows an issue, engineers suspect a problem with the high-voltage generator. In this case, engineers can input a command into the host computer to stop the high-voltage generator. Specifically, the host computer sends a command to the control board via the communication circuit. Upon receiving the command, the control board outputs a low-level signal at the control terminal of the MCU control circuit connected to the high-voltage generator. In the relay circuit connected to the high-voltage generator, transistor Q1 is cut off, the coil of relay U1 is not conducting, and the operating voltage of the high-voltage generator is cut off, causing the high-voltage generator to stop working. Then, EMC testing is performed. If the test data meets the requirements, it indicates a fault in the high-voltage generator, and EMC rectification of the high-voltage generator is then performed. If the test data still fails, the power supply to the remaining electrical equipment under test is continuously disconnected until the faulty equipment is identified.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the specific embodiments described above. The specific embodiments and descriptions in the specification are merely for further illustrating the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of this utility model as claimed.

Claims

1. An EMC testing device for CBCT equipment, characterized in that, It includes a communication circuit and a control board. The communication circuit is connected between the host computer and the control board, and the control board is connected to M electrical devices under test in the CBCT equipment; M is an integer greater than or equal to 4.

2. The EMC testing device for CBCT equipment according to claim 1, characterized in that, The control board includes a power conversion circuit, an MCU control circuit, and M relay circuits. The power conversion circuit is connected to the communication circuit and the MCU control circuit, and is used to convert the external high voltage into the low voltage required by the MCU control circuit and the communication circuit. The communication circuit is connected between the MCU control circuit and the host computer. The M control output terminals of the MCU control circuit are connected one-to-one with the M relay circuits, and the M relay circuits are connected one-to-one with the M electrical devices under test.

3. The EMC testing device for CBCT equipment according to claim 2, characterized in that, The electrical equipment under test includes servo motors, stepper motors, high-voltage generators, and image detectors.

4. The EMC testing device for CBCT equipment according to claim 3, characterized in that, The relay circuit includes a transistor and a relay. The base of the transistor is connected to the control output terminal of the MCU control circuit, the collector of the transistor is connected to the power supply voltage terminal through a resistor, and the emitter of the transistor is connected to the ground terminal. The collector of the transistor is connected to the control input terminal of the relay, the common terminal of the relay is connected to the external power supply, the normally open terminal of the relay is connected to the power input terminal of the electrical device under test, and the positive power supply terminal of the relay is connected to the power supply voltage terminal.

5. The EMC testing device for CBCT equipment according to claim 4, characterized in that, The relay circuit connected to the servo motor, stepper motor, and image detector uses a 24V DC power supply.

6. The EMC testing apparatus for CBCT equipment according to claim 4, characterized in that, In the relay circuit connected to the high-voltage generator, the external power supply is 220V AC.

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