Camera EMC switching circuit board

Abstract

The utility model relates to a camera EMC switching circuit board, which belongs to the technical field of cameras and comprises a PCB (printed circuit board) and a camera LED +, a camera LED-, a camera CLK, a camera VDD, a camera VOUT, a camera GND, a main control board LED +, a main control board LED-, a main control board CLK, a main control board VDD, a main control board VOUT and a main control board GND which are arranged on the PCB. According to the utility model, the resistor R1 is connected in series while the EMC is rectified, the line impedance is adjusted by changing the resistor, so that the imaging effect of the camera is optimal, and the capacitors C1 and C2 are added on the VDD line for filtering differential mode signals, so that the influence of noise on the signals is reduced, and the conducted noise is inhibited; the magnetic beads are connected in series on the power line and the signal line to suppress high-frequency noise and peak interference, so that electromagnetic radiation interference can be effectively reduced, the possible influence of products of the company on the electromagnetic environment of patients and hospitals is reduced, the high-frequency noise is filtered, and the image quality of the camera is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cameras, in particular to a camera EMC adapter circuit board. Background Art

[0002] A medical endoscope camera system is an auxiliary device for endoscope equipment in the medical field. It transmits microscopic images inside the patient's body to a display screen through a camera for doctors to observe and diagnose. It plays an important role in modern medical diagnosis and is widely used in endoscope examinations of the digestive tract, urinary tract, respiratory tract, etc. Electromagnetic compatibility is a very important requirement for medical equipment. The EMC standard for medical equipment is the basis for ensuring that medical equipment works properly in an electromagnetic environment and cooperates with other devices. Therefore, this camera adapter board is designed to meet the EMC requirements of the company's products. Content of the Utility Model

[0003] The utility model aims to solve the above technical problems and provides a camera EMC adapter circuit board.

[0004] To solve the above technical problems, the technical solution provided by the utility model is as follows:

[0005] A camera EMC adapter circuit board includes a PCB board and camera LED+, camera LED-, camera CLK, camera VDD, camera VOUT, camera GND, main control board LED+, main control board LED-, main control board CLK, main control board VDD, main control board VOUT, and main control board GND arranged on the PCB board;

[0006] One end of the camera LED- is connected with an ESD diode D1 and a magnetic bead L1, and the other end of the magnetic bead L1 is connected to the main control board LED-;

[0007] One end of the camera LED+ is connected with a TVS diode D3 and a magnetic bead L3, and the other end of the magnetic bead L3 is connected to the main control board LED+;

[0008] One end of the camera CLK is connected with an ESD diode D4 and a resistor R1, and the other end of the resistor R1 is connected to the main control board CLK;

[0009] One end of the camera VDD is connected with an ESD diode D5 and a magnetic bead L4. The other end of the magnetic bead L4 is connected with capacitors C1, C2 and the main control board VDD, and the other ends of the capacitors C1, C2 are grounded;

[0010] One end of the camera VOUT is connected with an ESD diode D2 and a magnetic bead L2, and the other end of the magnetic bead L2 is connected to the main control board VOUT.

[0011] Preferably, the other ends of the ESD diode D1 and the TVS diode D3 are grounded.

[0012] Preferably, the other ends of the ESD diode D4 and the ESD diode D5 are grounded.

[0013] Preferably, the other end of the ESD diode D2 is grounded.

[0014] Preferably, the camera GND and the main control board GND are laid with a ground plane, and other grounding ends are all connected to this ground plane.

[0015] Preferably, the capacitance of the capacitor C1 is 10 uF ± 20%.

[0016] Preferably, the capacitance of the capacitor C2 is 0.1 uF ± 20%.

[0017] Preferably, the resistance value of the resistor R1 is 0 Ω.

[0018] Preferably, the nominal impedances of the beads L1, L2, L3, and L4 @ test frequency are 240 Ω @ 100 MHz.

[0019] After adopting the above structure, the present utility model has the following advantages:

[0020] By connecting a resistor R1 in series while rectifying the EMC, the present utility model adjusts the line impedance by changing this resistor to achieve the best imaging effect of the camera. By adding capacitors C1 and C2 on the VDD line for filtering differential-mode signals, the influence of noise on the signal is reduced, and conducted noise is suppressed. By connecting beads in series on the power line and the signal line to suppress high-frequency noise and spike interference, electromagnetic radiation interference can be effectively reduced, the impact that the products of the company may have on patients and the hospital electromagnetic environment is reduced, and high-frequency noise is filtered to improve the image quality of the camera.

[0021] The above summary is only for the purpose of the specification and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present utility model will be readily apparent by reference to the drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1This is the circuit diagram of the present utility model.

[0024] Figure 2 This is the schematic diagram of the circuit board of the present utility model. Detailed implementation manners

[0025] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present application and should not be construed as a limitation of the present application.

[0026] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0027] The present utility model will be further described in detail below in conjunction with the full text.

[0028] Combined with the attached Figures 1 - 2 , a camera EMC adapter circuit board includes a PCB board and camera LED+, camera LED-, camera CLK, camera VDD, camera VOUT, camera GND, main control board LED+, main control board LED-, main control board CLK, main control board VDD, main control board VOUT and main control board GND provided on the PCB board;

[0029] One end of the camera LED- is connected with an ESD diode D1 and a magnetic bead L1, and the other end of the magnetic bead L1 is connected to the main control board LED-;

[0030] One end of the camera LED+ is connected with a TVS diode D3 and a magnetic bead L3, and the other end of the magnetic bead L3 is connected to the main control board LED+;

[0031] One end of the camera CLK is connected with an ESD diode D4 and a resistor R1, and the other end of the resistor R1 is connected to the main control board CLK;

[0032] One end of the camera VDD is connected with an ESD diode D5 and a magnetic bead L4. The other end of the magnetic bead L4 is connected with a capacitor C1, a capacitor C2 and the main control board VDD, and the other ends of the capacitor C1 and the capacitor C2 are grounded;

[0033] One end of the camera VOUT is connected to an ESD diode D2 and a bead L2, and the other end of the bead L2 is connected to the main control board VOUT.

[0034] The other ends of the ESD diode D1 and the TVS diode D3 are grounded.

[0035] The other ends of the ESD diode D4 and the ESD diode D5 are grounded.

[0036] The other end of the ESD diode D2 is grounded.

[0037] The camera GND and the main control board GND are laid with a ground plane, and other grounding ends are all connected to this ground plane.

[0038] The capacitance of the capacitor C1 is 10uF ± 20%.

[0039] The capacitance of the capacitor C2 is 0.1uF ± 20%.

[0040] The resistance value of the resistor R1 is 0Ω. While rectifying the EMC, a resistor R1 is connected in series, and the line impedance is adjusted by changing this resistor to make the imaging effect of the camera reach the best.

[0041] The nominal impedances of the beads L1, L2, L3, and L4 @ the test frequency are 240Ω @ 100MHz.

[0042] When the present utility model is specifically implemented, as Figure 1 shown, the camera LED- is connected to the ESD diode D1 and the bead L1, the other end of the ESD diode D1 is grounded, and the other end of the bead L1 is connected to the main control board LED-; the camera LED+ is connected to the TVS diode D3 and the bead L3, the other end of the TVS diode D3 is grounded, and the other end of the bead L3 is connected to the main control board LED+; the camera CLK is connected to the ESD diode D4 and the resistor R1, the other end of the ESD diode D4 is grounded, and the other end of the resistor R1 is connected to the main control board CLK; the camera VDD is connected to the ESD diode D5 and the bead L4, the other end of the ESD diode D5 is grounded, the other end of the bead L4 is connected to the capacitors C1, C2 and the main control board VDD, the other ends of the capacitors C1, C2 are grounded, the camera VOUT is connected to the ESD diode D2 and the bead L2, the other end of the ESD diode D2 is grounded, and the other end of the bead L2 is connected to the main control board VOUT;

[0043] The camera GND and the main control board GND are laid with a ground plane, and other grounding ends are all connected to this ground plane.

[0044] The working principle of the present utility model:

[0045] The utility model suppresses high-frequency noise and spike interference by connecting a magnetic bead in series on the power line and the signal line, which can effectively reduce electromagnetic radiation interference. The utility model adds capacitors C1 and C2 on the VDD line for filtering differential-mode signals, reducing the influence of noise on the signals, and suppressing conducted noise. The utility model connects D1, D2, D3, D4, and D5 in parallel in the circuit. When the circuit works normally, it is in the cut-off state and does not affect the normal operation of the circuit. When an abnormal overvoltage occurs in the circuit and reaches its breakdown voltage, it quickly changes from the high-impedance state to the low-impedance state, providing a low-impedance conduction path for the instantaneous current, and clamping the abnormal high voltage within a safe level at the same time, thus protecting the protected IC or circuit; when the abnormal overvoltage disappears, it returns to the high-impedance state and the circuit works normally. The utility model adds a resistor R1 on the CLK line, and the resistance value of this resistor can be adjusted during the production process to match the impedance, so as to make the camera image reach the best effect.

[0046] The above describes the utility model and its implementation manners. Such a description is not restrictive, and what is shown throughout the text is only one of the implementation manners of the utility model. The actual structure is not limited thereto. Generally speaking, if those of ordinary skill in the art are inspired by it and design, without creative work, a structural manner and an embodiment similar to the technical solution without departing from the creative purpose of the utility model, they shall fall within the protection scope of the utility model.

Claims

1. A camera EMC adapter circuit board, characterized in that, It includes a PCB board and camera LED+, camera LED-, camera CLK, camera VDD, camera VOUT, camera GND, main control board LED+, main control board LED-, main control board CLK, main control board VDD, main control board VOUT and main control board GND arranged on the PCB board; One end of the camera LED- is connected with an ESD diode D1 and a bead L1, and the other end of the bead L1 is connected to the main control board LED-; One end of the camera LED+ is connected with a TVS diode D3 and a bead L3, and the other end of the bead L3 is connected to the main control board LED+; One end of the camera CLK is connected with an ESD diode D4 and a resistor R1, and the other end of the resistor R1 is connected to the main control board CLK; One end of the camera VDD is connected with an ESD diode D5 and a bead L4, the other end of the bead L4 is connected with capacitors C1, C2 and the main control board VDD, and the other ends of the capacitors C1, C2 are grounded; One end of the camera VOUT is connected with an ESD diode D2 and a bead L2, and the other end of the bead L2 is connected to the main control board VOUT.

2. The camera EMC adapter circuit board according to claim 1, wherein: The other ends of the ESD diode D1 and the TVS diode D3 are grounded.

3. The camera EMC adapter circuit board according to claim 2, characterized in that: The other ends of the ESD diode D4 and the ESD diode D5 are grounded.

4. The camera EMC adapter circuit board according to claim 3, characterized in that: The other end of the ESD diode D2 is grounded.

5. The camera EMC adapter circuit board according to claim 4, characterized in that: The camera GND and the main control board GND are laid with a ground plane, and other grounding ends are all connected to this ground plane.

6. The camera EMC adapter circuit board according to claim 1, characterized in that: The capacitance of the capacitor C1 is 10uF±20%.

7. The camera EMC adapter circuit board according to claim 1, wherein: The capacitance of the capacitor C2 is 0.1uF±20%.

8. The camera EMC adapter circuit board according to claim 1, wherein: The resistance value of the resistor R1 is 0Ω.

9. The camera EMC adapter circuit board according to claim 1, wherein: The nominal impedance / test frequency of the beads L1, L2, L3, L4 is 240Ω / 100MHz.

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