USB filter

Abstract

The utility model discloses a universal serial bus (USB) filter, which comprises a shell, a circuit board arranged in the shell, a first USB interface and a second USB interface, the first USB interface and the second USB interface are arranged on the shell, and a filter circuit, a first photoelectric conversion circuit and a second photoelectric conversion circuit are arranged on the circuit board. An optical fiber is connected between the first photoelectric conversion circuit and the second photoelectric conversion circuit, the first photoelectric conversion circuit is also connected with the first USB interface, the second photoelectric conversion circuit is also connected with the second USB interface, and two ends of the filter circuit are respectively connected with the first USB interface and the second USB interface. According to the utility model, the transmission speed and anti-interference performance of data can be improved, and the transmission speed and quality of USB data can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of filters, in particular to a USB filter. Background Art

[0002] USB filters are used for USB data transmission in scenarios where shielding is required. For example, when a device inside a shielding box transmits data to a device outside the shielding box, high-frequency signals such as Bluetooth and WIFI are shielded.

[0003] Existing USB filters generally use ordinary circuits to transmit data, which has a slow transmission speed and poor anti-interference performance.

[0004] Therefore, the prior art needs to be improved. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a USB filter, aiming to improve the data transmission speed and anti-interference performance, and ensure the data transmission speed and quality.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A USB filter comprises a housing, a circuit board arranged in the housing, a first USB interface and a second USB interface arranged on the housing, wherein:

[0008] A filtering circuit, a first photoelectric conversion circuit and a second photoelectric conversion circuit are provided on the circuit board. An optical fiber is connected between the first photoelectric conversion circuit and the second photoelectric conversion circuit. The first photoelectric conversion circuit is also connected to the first USB interface, and the second photoelectric conversion circuit is also connected to the second USB interface. Both ends of the filtering circuit are connected to the first USB interface and the second USB interface, respectively.

[0009] In some examples, the first photoelectric conversion circuit and the second photoelectric conversion circuit both include a light emitting diode that converts an electrical signal into an optical signal and a photodiode that converts an optical signal into an electrical signal.

[0010] In some examples, the shell includes a first shell and a second shell connected to each other in a cover manner, a mounting groove is provided in the second shell, the mounting groove accommodates the circuit board, a groove wall of the mounting groove is provided with conductive foam, and the conductive foam abuts against the circuit board.

[0011] In some examples, a filter cavity is disposed in the first shell and / or the second shell, and the filter cavity houses the filter circuit.

[0012] In some examples, there are multiple filter cavities, the filter circuit includes multiple cascaded filter units, and each filter cavity is covered by one filter unit.

[0013] In some examples, a waveguide hole is disposed in the housing, and the waveguide hole receives the optical fiber.

[0014] In some examples, the first USB interface and the second USB interface both have USB 2.0 data transmission pins and USB 3.0 data transmission pins.

[0015] In some examples, a mounting frame is disposed outside the housing.

[0016] It should be understood that within the scope of the present invention, the above-mentioned technical features of the present invention and the technical features specifically described below (such as implementation methods) can be combined with each other to form new or preferred technical solutions. Due to space limitations, they will not be described one by one here.

[0017] The beneficial effects of the utility model are as follows: by arranging the first photoelectric conversion circuit and the second photoelectric conversion circuit on the circuit board of the USB filter and transmitting data through an optical fiber connected between the first photoelectric conversion circuit and the second photoelectric conversion circuit, the optical fiber transmits data at a fast speed and is not easily interfered by electromagnetic waves. Therefore, the USB filter of the utility model can not only improve the data transmission speed, but also prevent interference and ensure the quality of data transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the structure of the first embodiment of the USB filter of the utility model.

[0020] Figure 2 for Figure 1 First exploded schematic representation of the structure.

[0021] Figure 3 for Figure 1 Second exploded schematic representation of the structure.

[0022] Figure 4 This is a circuit principle block diagram of the USB filter of the utility model.

[0023] Figure 5This is a circuit connection diagram of the USB filter of the utility model.

[0024] Figure 6 This is a schematic diagram of the exploded first shell and the second shell of the USB filter of the utility model.

[0025] Figure 7 for Figure 1 Schematic cross-section of the structure.

[0026] Description of reference numerals:

[0027] 100-filter, 1-shell, 11-first shell, 12-second shell, 13-installation groove, 14-filter cavity, 15-waveguide hole, 2-circuit board, 21-filter circuit, 22-first photoelectric conversion circuit, 23-second photoelectric conversion circuit, 3-first USB interface, 4-second USB interface, 5-optical fiber, 6-installation frame, 61-connection hole, 7-conductive foam. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "electrical connection", "fixed", etc. should be understood in a broad sense. For example, "electrical connection" can be a fixed electrical connection, a detachable electrical connection, or an integrated electrical connection; it can be a mechanical electrical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features.

[0032] The specific embodiments are as follows:

[0033] Please refer to Figures 1 to 4 The utility model proposes a USB filter 100, comprising a housing 1, a circuit board 2 arranged in the housing 1, a first USB interface 3 and a second USB interface 4 arranged on the housing 1. In this embodiment, the first USB interface 3 and the second USB interface 4 are respectively arranged at two opposite ends of the housing 1. The first USB interface 3 is used to connect the device in the shielding box, and the second USB interface 4 is used to connect the device outside the shielding box; or, the first USB interface 3 is used to connect the device outside the shielding box, and the second USB interface 4 is used to connect the device in the shielding box; the devices connected by the USB filter 100 inside and outside the shielding box are a master device and a slave device.

[0034] The circuit board 2 is provided with a filter circuit 21, a first photoelectric conversion circuit 22 and a second photoelectric conversion circuit 23. An optical fiber 5 is connected between the first photoelectric conversion circuit 22 and the second photoelectric conversion circuit 23. The first photoelectric conversion circuit 22 is also connected to the first USB interface 3, and the second photoelectric conversion circuit 23 is also connected to the second USB interface 4. The two ends of the filter circuit 21 are respectively connected to the first USB interface 3 and the second USB interface 4. The filter circuit 21 mainly filters the power signal between the first USB interface 3 and the second USB interface 4. Of course, the filter circuit 21 can also filter the data signal transmitted between the first USB interface 3 and the second USB interface 4. The first photoelectric conversion circuit 22 and the second photoelectric conversion circuit 23 both have the function of converting electrical signals into optical signals and converting optical signals into electrical signals. That is, the first photoelectric conversion circuit 22 and the second photoelectric conversion circuit 23 of the embodiment of the utility model realize bidirectional transmission of data, and data can be transmitted from the first USB interface 3 to the second USB interface 4, and can also be transmitted from the second USB interface 4 to the first USB interface 3. In this way, the USB filter 100 of the present invention can connect the first USB interface 3 to the host device and the second USB interface 4 to the slave device, or can connect the second USB interface 4 to the host device and the first USB interface 3 to the slave device.

[0035] The working principle of the USB filter 100 of the utility model is as follows:

[0036] When the first USB interface 3 is connected to the host device, the power supply of the host device is transmitted to the second USB interface 4 through the first USB interface 3, and the slave device at the second USB interface 4 is powered, and the filter circuit 21 filters the power supply. The host device outputs data to the first USB interface 3, and the electrical signal is converted into an optical signal by the first photoelectric conversion circuit 22, and then transmitted to the second photoelectric conversion circuit 23 through the optical fiber 5. The second photoelectric conversion circuit 23 converts the optical signal into an electrical signal and then outputs the data from the second USB interface 4 to the slave device, thereby completing the data transmission. Since the data transmission process uses the optical fiber 5 for transmission, the transmission speed is fast and is not interfered by high-frequency electromagnetic signals such as Bluetooth and WIFI signals. That is, the USB filter 100 of the utility model can ensure that when data is transmitted through the USB interface, it can transmit data at high speed and can transmit data with high quality and without interference, while ensuring the safety of data transmission, and is very suitable for scenes with shielding requirements such as data transmission inside and outside the shielding box. The USB filter 100 of the utility model can also be used in wall-penetrating scenes.

[0037] The first photoelectric conversion circuit 22 of the USB filter 100 of the present invention is connected to the data transmission pin of the first USB interface 3, the second photoelectric conversion circuit 23 is connected to the data transmission pin of the second USB interface 4, and the two ends of the filter circuit 21 are respectively connected to the power pins of the first USB interface 3 and the second USB interface 4. Specifically, Figure 5 As shown, the first USB interface USB1 and the second USB interface USB2 have the same pins and layout, and both USB interfaces include a power pin VBUS, data transmission pins STDA_SSRX-, STDA_SSRX+, STDA_SSTX-, STDA_SSTX+, etc., and a ground pin GND.

[0038] The filter circuit 21 is connected between the VBUS pin of USB1 and the VBUS pin of USB2 to filter the power signal and shield the interference of the high frequency part in the power signal.

[0039] The end of the first photoelectric conversion circuit 22 facing away from the optical fiber 5 is connected to the data transmission pins STDA_SSRX-, STDA_SSRX+, STDA_SSTX-, and STDA_SSTX+ of USB1, and the end of the second photoelectric conversion circuit 23 facing away from the optical fiber 5 is connected to the data transmission pins STDA_SSRX-, STDA_SSRX+, STDA_SSTX-, and STDA_SSTX+ of USB2, thereby realizing data transmission between USB1 and USB2.

[0040] It can be understood that the filter circuit 21 can also be connected between the STDA_SSRX- pins of the two USB interfaces, or between the two STDA_SSRX+ pins, or between the two STDA_SSTX- pins, or between the two STDA_SSTX+ pins. That is, in addition to filtering the power signal between USB1 and USB2, the filter circuit 21 can also filter the data signal between USB1 and USB2.

[0041] As an implementation mode, the first photoelectric conversion circuit 22 and the second photoelectric conversion circuit 22 of this embodiment both include a light-emitting diode that converts an electrical signal into an optical signal and a photodiode that converts an optical signal into an electrical signal. That is, the first photoelectric conversion circuit 22 has a light-emitting diode that converts an electrical signal into an optical signal and a photodiode that converts an optical signal into an electrical signal, and the second photoelectric conversion circuit 23 has a light-emitting diode that converts an electrical signal into an optical signal and a photodiode that converts an optical signal into an electrical signal, so that data can be transmitted bidirectionally.

[0042] In this embodiment, the first photoelectric conversion circuit 22 and the second photoelectric conversion circuit 22 also include an amplifier circuit to amplify the signal. Alternatively, the first photoelectric conversion circuit 22 and the second photoelectric conversion circuit 22 both use the optical fiber transceiver circuit in the prior art to realize the conversion of photoelectric signals.

[0043] Preferably, the first USB interface 3 and the second USB interface 4 of this embodiment both have USB2.0 data transmission pins and USB3.0 data transmission pins. Figure 5 As shown in the figure, both the first USB interface USB1 and the second USB interface USB2 have data transmission pins D- and D+, and D- and D+ are data transmission pins of USB2.0 standard; at the same time, both the first USB interface USB1 and the second USB interface USB2 have data transmission pins STDA_SSRX-, STDA_SSRX+, STDA_SSTX-, and STDA_SSTX+, and STDA_SSRX-, STDA_SSRX+, STDA_SSTX-, and STDA_SSTX+ are data transmission pins of USB3.0 standard. In this way, the USB filter 100 of this embodiment is compatible with data transmission of USB2.0 and USB3.0 standards, thereby expanding the application scope of the USB filter 100.

[0044] Preferably, if Figure 5As shown, the two ends of the filter circuit 21 are also connected to the data transmission pins D- and D+ of the first USB interface USB1 and the second USB interface USB2 respectively, and the filter circuit 21 is also connected to the VBUS power pins of the two interfaces. In this way, the filter circuit 21 of the USB filter 100 of the utility model constitutes a multi-path filtering effect, which not only filters the power signal but also filters the USB2.0 data transmission channel.

[0045] Continue to refer Figure 2 , Figure 3 The housing 1 of the USB filter 100 of this embodiment includes a first housing 11 and a second housing 12 that are connected to each other. The second housing 12 is provided with a mounting groove 13, and the mounting groove 13 receives the circuit board 2. Figure 6 As shown, the groove wall of the installation groove 13 is provided with a conductive foam 7, and the conductive foam 7 is in contact with the circuit board 2. The conductive foam can absorb electromagnetic waves and have a shielding effect. It can be understood that the periphery of the installation groove 13 in contact with the first shell 11 can also be filled with conductive foam 7 and pressed by the first shell 11 to further enhance the shielding effect.

[0046] In this embodiment, the first shell 11 and the second shell 12 are pressed together and fastened by screws.

[0047] The first housing 11 and / or the second housing 12 of the present invention is provided with a filter cavity 14, and the filter cavity 14 houses the filter circuit 21. Figure 6 As described above, the inner surfaces of the first shell 11 and the second shell 12 of this embodiment are both provided with a filter cavity 14, and the filter cavity 14 covers the filter circuit 21, so that the physical properties of the filter cavity 14 combined with the filter circuit 21 play a good filtering and shielding role.

[0048] Furthermore, in this embodiment, there are multiple filter cavities 14, and the filter circuit 21 includes multiple cascaded filter units. Each filter cavity 14 is covered with a filter unit. The filter unit can be a circuit unit such as an LC filter. Multiple filter units are combined to form a cascaded filter effect. At the same time, multiple filter cavities 14 are combined to form a cascaded cavity filter, which further improves the filter shielding effect. Figure 7 As shown in FIG. 1 , there are three groups of filter cavities 14 correspondingly between the first shell 11 and the second shell 12 of this embodiment, thereby forming a three-stage filter.

[0049] Preferably, a waveguide hole 15 is provided in the housing 1 of the utility model, and the waveguide hole 15 receives the optical fiber 5. Figure 5As shown, in this embodiment, a waveguide hole 15 is opened on the inner surface of the first shell 11 to accommodate the optical fiber 5. The waveguide hole 15 is an application of a shielded waveguide hole tube, which allows non-metallic objects to pass through it while ensuring shielding.

[0050] like Figure 1 As shown, the housing 1 of the USB filter 100 of the present invention is provided with a mounting frame 6. The mounting frame 6 is convenient for fixed connection with the shielding box. In this embodiment, the mounting frame 6 is provided with connecting holes 61 in an annular direction for fixing to the shielding box by screw connection.

[0051] The above description is only an example to clearly illustrate the present invention, and does not limit the patent scope of the present invention. It is impossible to list all implementation methods here. All equivalent structural changes made by using the contents of the technical solution of the present invention under the concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A USB filter, comprising a housing, a circuit board disposed in the housing, a first USB interface and a second USB interface disposed on the housing, characterized in that: A filtering circuit, a first photoelectric conversion circuit and a second photoelectric conversion circuit are provided on the circuit board. An optical fiber is connected between the first photoelectric conversion circuit and the second photoelectric conversion circuit. The first photoelectric conversion circuit is also connected to the first USB interface, and the second photoelectric conversion circuit is also connected to the second USB interface. Both ends of the filtering circuit are connected to the first USB interface and the second USB interface, respectively.

2. The USB filter according to claim 1, characterized in that: The first photoelectric conversion circuit and the second photoelectric conversion circuit both include a light emitting diode for converting an electrical signal into an optical signal and a photodiode for converting an optical signal into an electrical signal.

3. The USB filter according to claim 1, characterized in that: The shell comprises a first shell and a second shell connected to each other in a cover manner. A mounting groove is arranged in the second shell to accommodate the circuit board. A conductive foam is arranged on a groove wall of the mounting groove to abut against the circuit board.

4. The USB filter according to claim 3, characterized in that: A filter cavity is arranged in the first shell and / or the second shell, and the filter cavity covers the filter circuit.

5. The USB filter according to claim 4, characterized in that: There are a plurality of filter cavities, and the filter circuit comprises a plurality of cascaded filter units, and each of the filter cavities is provided with a filter unit.

6. The USB filter according to claim 1, characterized in that: A waveguide hole is provided in the shell, and the waveguide hole receives the optical fiber.

7. The USB filter according to claim 1, characterized in that: The first USB interface and the second USB interface both have a USB2.0 data transmission pin and a USB3.0 data transmission pin.

8. The USB filter according to claim 1, characterized in that: A mounting frame is arranged outside the shell.

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