An endoscope USB isolation circuit

Abstract

The present invention discloses an endoscope USB isolation circuit, comprising: an input circuit and an output circuit, wherein the isolation circuit is connected between the input circuit and the output circuit, and the input circuit is used to receive a power supply voltage V in Input isolation circuit; the isolation circuit is used to input the power supply voltage V in After electrical isolation, the output voltage V out Power the output circuit; the output circuit is used to receive the output voltage V from the isolation circuit out The power is supplied for data processing and storage. There is no direct electrical connection between the input voltage and the output voltage, thereby realizing the conversion and transmission of the USB data signal before conversion and the USB data signal after conversion with electrical isolation, thereby avoiding the direct connection between the USB interface module and the isolation chip, preventing the mobile terminal from causing interference to the circuit and the harm of electric shock to the human body, and improving the safety of use.

Description

Technical field

[0001] The present invention belongs to the technical field of electrical isolation circuits, and in particular relates to an endoscope USB isolation circuit. [Background Technology]

[0002] The medical endoscopes currently used on the market transmit data captured from internal human tissues. This process requires the use of a dedicated host computer from the manufacturer. To ensure compatibility with endoscopes of different brands and specifications, a USB transmission protocol is installed in the endoscope to directly connect to computers, tablets and other terminals for real-time transmission of commonly used MJPEG or YUY2 format video signals. However, due to the lack of an isolation circuit in the USB interface, once there is leakage in the terminal, the voltage will directly cause electric shock and harm human health, posing a major safety hazard. [Summary of the invention]

[0003] In order to solve the existing problems in the background technology, the present invention provides an endoscope USB isolation circuit, which is applied to the signal transmission circuit of the endoscope. The isolation circuit converts the input voltage of the USB interface module into an output voltage to supply the isolation chip for data signal conversion, isolates the converted data signal, and severs the direct electrical connection relationship, thereby protecting the endoscope from the hazards of circuit leakage during use.

[0004] The present invention adopts the following technical solutions:

[0005] An endoscope USB isolation circuit, comprising:

[0006] An input circuit and an output circuit, an isolation circuit is connected between the input circuit and the output circuit, wherein:

[0007] The input circuit is used to receive the supply voltage V from the external terminal in input into the isolation circuit;

[0008] The isolation circuit is used to convert the input supply voltage V in After electrical isolation, the output voltage V out supplying power to the output circuit;

[0009] The output circuit is used to receive the output voltage V from the isolation circuit out Power supply for data processing and storage.

[0010] Furthermore, the input circuit includes a USB interface module, a first USB-HUB controller and a first FLASH chip, the VBUS pin, D- pin, D+ pin and GND1 pin on the USB interface module are respectively connected to the VBUS pin, D0- pin, D0+ pin and GND1 pin on the first USB-HUB controller, and the GND1 pins on the USB interface module and the first USB-HUB controller are grounded together, and the first FLASH chip is connected to the first USB-HUB controller.

[0011] Furthermore, the output circuit includes a second USB-HUB controller, a second FLASH chip, an image processing module and a CMOS chip. The FLASH chip is connected to the second USB-HUB controller, the CMOS chip is connected to the image processing module, the DN- pin and DN+ pin on the second USB-HUB controller are respectively connected to the D- pin and D+ pin on the image processing module, and the GND2 pins on the second USB-HUB controller and the image processing module are both grounded.

[0012] Furthermore, the isolation circuit includes a DC-DC power supply module and an isolation chip, the DC-DC power supply module having a VBUS first pin end and a VBUS second pin end, wherein the VBUS first pin end is simultaneously connected to the VBUS pin on the USB interface module and the VBUS pin on the first USB-HUB controller, the VBUS second pin end is simultaneously connected to the VBUS pin on the isolation chip and the VBUS pin on the second USB-HUB controller, the VDD pin, UD- pin, and UD+ pin on one end of the isolation chip are respectively connected to the VDD pin, DN- pin, and DN+ pin on the first USB-HUB controller, the D0- pin and D0+ pin on the other end of the isolation chip are respectively connected to the D0- pin and D0+ pin on the second USB-HUB controller, and the GND1 pin and GND2 pin on the DC-DC power supply module and the isolation chip are both grounded.

[0013] Furthermore, the isolation chip is an ICE08USBX model chip.

[0014] Furthermore, the DC-DC power supply module is a H0505S-2WR2 model power supply module.

[0015] Furthermore, the first FLASH chip and the second FLASH chip are both M25P05 memory chips.

[0016] The beneficial effects of the present invention are as follows:

[0017] An isolation circuit is connected between the input circuit and the output circuit to achieve electrical isolation. The USB interface module is connected to an external terminal interface such as a computer or tablet. The received input voltage is converted into a +5V output voltage by a DC-DC power supply module and synchronously provided to the isolation chip, the second USB-HUB controller and the image processing module. The CMOS chip converts the optical signal into an electrical signal, which is processed into a matching MJPEG or YUY2 video format by the image processing module and stored in the FLASH chip. There is no direct electrical connection between the input voltage and the output voltage, thereby achieving electrically isolated conversion and transmission of the USB data signal before conversion and the USB data signal after conversion, thereby avoiding direct connection between the USB interface module and the isolation chip, preventing interference to the circuit and the risk of electric shock to the human body due to leakage of the mobile terminal, and improving safety of use.

Brief Description of the Drawings

[0018] Figure 1 This is a connection diagram of an endoscope USB isolation circuit of the present invention. [Specific implementation method]

[0019] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not limited to the present invention.

[0020] like Figure 1 The present invention provides an endoscope USB isolation circuit, which can be used in the USB signal transmission circuit of the endoscope to play a role in electrical isolation and safety protection.

[0021] For the above-mentioned endoscope USB isolation circuit, specifically, it includes:

[0022] An input circuit, an output circuit and an isolation circuit, wherein the isolation circuit is connected between the input circuit and the output circuit, wherein the input circuit is used to receive a power supply voltage V from an external terminal in Input into the isolation circuit; the isolation circuit is used to input the power supply voltage V in After electrical isolation, the output voltage V out Power the output circuit; the output circuit is used to receive the output voltage V from the isolation circuit out Power supply for data processing and storage.

[0023] Specifically, the input circuit includes a USB interface module 1, a first USB-HUB controller 2 and a first FLASH chip 3. The VBUS pin, D- pin, D+ pin and GND1 pin on the USB interface module 1 are respectively connected to the VBUS pin, D0- pin, D0+ pin and GND1 pin on the first USB-HUB controller 2, and the GND1 pins on the USB interface module 1 and the first USB-HUB controller 2 are grounded together. The first FLASH chip 3 is connected to the first USB-HUB controller 2.

[0024] Secondly, specifically, the output circuit includes a second USB-HUB controller 4, a second FLASH chip 5, an image processing module 6 and a CMOS chip 7. Preferably, the first FLASH chip 3 and the second FLASH chip 5 are both M25P05 model storage chips, the second FLASH chip 5 is connected to the second USB-HUB controller 4, the CMOS chip 7 is connected to the image processing module 6, the DN- pin and DN+ pin on the second USB-HUB controller 4 are respectively connected to the D- pin and D+ pin on the image processing module 6, and the GND2 pins on the second USB-HUB controller 4 and the image processing module 6 are both grounded.

[0025] Furthermore, the isolation circuit includes a DC-DC power supply module 8 and an isolation chip 9. Preferably, the isolation chip 9 is an ICE08USBX model chip, and the DC-DC power supply module 8 is an H0505S-2WR2 model power supply module. The DC-DC power supply module 8 has a VBUS first pin end 81 and a VBUS second pin end 82, wherein the VBUS first pin end 81 is simultaneously connected to the VBUS pin on the USB interface module 1 and the VBUS pin on the first USB-HUB controller 2, and the VBUS second pin end 82 is simultaneously connected to the VBUS pin on the isolation chip 9 and the VBUS pin on the second USB-HUB controller 4. The VDD pin, UD- pin, and UD+ pin on one end of the isolation chip 9 are respectively connected to the VDD pin, DN- pin, and DN+ pin on the first USB-HUB controller 2, and the D0- pin and D0+ pin on the other end of the isolation chip 9 are respectively connected to the D0- pin and D0+ pin on the second USB-HUB controller 4. The GND1 pin and GND2 pin on the DC-DC power supply module 8 and the isolation chip 9 are both grounded.

[0026] The working principle of the endoscope USB isolation circuit is as follows: after the USB interface module 1 is inserted into the interface of a PC or tablet computer, the +5V input voltage is input to the DC-DC power supply module 8, which is converted into a +5V output voltage and provided to the isolation chip 9, the second USB-HUB controller 4 and the image processing module 6. The CMOS chip 7 contains an optical lens, which converts the optical signal into an electrical signal after photographing the internal tissue of the human body. The image processing module 6 converts the electrical signal into a corresponding MJPEG or YUY2 video format file and stores it in the second FLASH chip 5. At the same time, the first USB-HUB controller 4 and the image processing module 6 are connected to the first USB-HUB module 8. The SB-HUB controller 2 and the second USB-HUB controller 4 temporarily store the signal data that cannot be processed in the first FLASH chip 3 and the second FLASH chip 5. Furthermore, the DC-DC power supply module 8 electrically separates the input voltage and the output voltage, thereby isolating the direct electrical connection line of the USB data signal before and after the conversion. If the USB interface module 1 and the isolation chip 9 are directly connected for data conversion processing, if the mobile terminal leaks electricity, it will directly interfere with the output circuit and cause a clicking accident, posing a great safety hazard. This endoscope USB isolation circuit has well solved this safety hazard.

[0027] Moreover, this endoscope USB isolation circuit can meet various working modes during USB data transmission, detect data running speed by itself, and the transmission rate can reach up to 480Mbps per second. The electrical insulation strength between the signal input end and the output end is ≥1500VAC (actually up to 3000VAC), and the leakage current is ≤1mA. It not only meets the clinical use requirements of medical endoscopes, but also meets the certification standards of the national medical electrical safety standard GB9706.1 and the international medical electrical safety standard IEC60601-1 or EN60601-1, and plays a role in effectively protecting the lives of patients and operators.

[0028] The advantages of the present invention are:

[0029] An isolation circuit is connected between the input circuit and the output circuit to achieve electrical isolation. The USB interface module is connected to an external terminal interface such as a computer or tablet. The received input voltage is converted into a +5V output voltage by a DC-DC power supply module and synchronously provided to the isolation chip, the second USB-HUB controller and the image processing module. The CMOS chip converts the optical signal into an electrical signal, which is processed into a matching MJPEG or YUY2 video format by the image processing module and stored in the FLASH chip. There is no direct electrical connection between the input voltage and the output voltage, thereby achieving electrically isolated conversion and transmission of the USB data signal before conversion and the USB data signal after conversion, thereby avoiding direct connection between the USB interface module and the isolation chip, preventing interference to the circuit and the risk of electric shock to the human body due to leakage of the mobile terminal, and improving safety of use.

[0030] It is understood from common technical knowledge that the present invention may be implemented by other embodiments that do not depart from its spirit and essential features. Therefore, the embodiments disclosed above are, in all respects, merely illustrative and not exclusive. All modifications within the scope of the present invention or equivalent to the scope of the present invention are intended to be encompassed by the present invention.

Claims

1. An endoscope USB isolation circuit, characterized in that: include: An input circuit and an output circuit, wherein an isolation circuit is connected between the input circuit and the output circuit, wherein: The input circuit is used to receive the supply voltage V from the external terminal in input into the isolation circuit; The isolation circuit is used to convert the input supply voltage V in After electrical isolation, the output voltage V out supplying power to the output circuit; The output circuit is used to receive the output voltage V from the isolation circuit out Power supply for data processing and storage; The input circuit includes a USB interface module, a first USB-HUB controller and a first FLASH chip, the VBUS pin, D- pin, D+ pin and GND1 pin on the USB interface module are respectively connected to the VBUS pin, D0- pin, D0+ pin and GND1 pin on the first USB-HUB controller, and the GND1 pins on the USB interface module and the first USB-HUB controller are grounded together, and the first FLASH chip is connected to the first USB-HUB controller; The output circuit includes a second USB-HUB controller, a second FLASH chip, an image processing module and a CMOS chip. The second FLASH chip is connected to the second USB-HUB controller, the CMOS chip is connected to the image processing module, the DN- pin and DN+ pin on the second USB-HUB controller are respectively connected to the D- pin and D+ pin on the image processing module, and the GND2 pins on the second USB-HUB controller and the image processing module are both grounded.

2. The endoscope USB isolation circuit according to claim 1, characterized in that: The isolation circuit comprises a DC-DC power supply module and an isolation chip. The DC-DC power supply module is provided with a VBUS first pin end and a VBUS second pin end, wherein the VBUS first pin end is simultaneously connected to the VBUS pin on the USB interface module and the VBUS pin on the first USB-HUB controller, the VBUS second pin end is simultaneously connected to the VBUS pin on the isolation chip and the VBUS pin on the second USB-HUB controller, the VDD pin, UD- pin and UD+ pin on one end of the isolation chip are respectively connected to the VDD pin, DN- pin and DN+ pin on the first USB-HUB controller, the D0- pin and D0+ pin on the other end of the isolation chip are respectively connected to the D0- pin and D0+ pin on the second USB-HUB controller, and the GND1 pin and GND2 pin on the DC-DC power supply module and the isolation chip are both grounded.

3. The endoscope USB isolation circuit according to claim 2, characterized in that: The isolation chip is an ICE08USBX chip.

4. The endoscope USB isolation circuit according to claim 2, characterized in that: The DC-DC power supply module is a H0505S-2WR2 power supply module.

5. The endoscope USB isolation circuit according to claim 1, characterized in that: The first FLASH chip and the second FLASH chip are both M25P05 model storage chips.

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