Power supply system for high-speed serial interface

Abstract

The utility model discloses a power supply system for a high-speed serial interface, and belongs to the technical field of circuit design, and the power supply system comprises a high-speed serial interface communication module which is used for transmitting a high-frequency signal; the coaxial cable filtering module is connected with the high-speed serial interface communication module, the coaxial cable filtering module comprises an inductor corresponding to the working frequency required by the high-speed serial interface communication module, and the inductor is used for providing the working frequency required by high-frequency communication for the high-speed serial interface communication module; and the direct-current voltage input module is connected with the coaxial cable filtering module and is used for providing direct-current voltage for the coaxial cable filtering module. The output frequency of the coaxial cable filtering module corresponds to the working frequency required by the high-speed serial interface communication module, different camera interface standards can be compatible, when the camera interface standard of a vehicle needs to be changed, a circuit does not need to be redesigned, and cost is saved.

Description

Technical Field

[0001] The present application relates to the technical field of circuit design, and in particular to a power supply system for a high-speed serial interface. Background Art

[0002] In an autonomous driving control system, the camera and controller usually communicate using Power over Coax (POC) to power the camera. The coaxial cable can transmit data while powering the camera and controller. In this way, the controller or the entire vehicle can power the camera without additional wiring.

[0003] Gigabit Multimedia Serial Link (GMSL) is a high-speed serial interface introduced by Maxim Corporation. It is used to solve the problem of mutual transmission of serial data and parallel data. It is suitable for the transmission of video, audio and control signals. At present, the cameras used in vehicle-mounted autonomous driving have 2Mega, 8Mega and even higher resolutions. The corresponding communication method of serializer and deserializer has been upgraded from GMSL1 to GMSL2, and the POC filter of GMSL1 is not compatible with GMSL2. Therefore, if a vehicle equipped with the GMSL1 standard needs to upgrade the camera to an 8Mega camera, the circuit needs to be redesigned, which is costly. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide a power supply system for a high-speed serial interface to solve the problem of high cost in the prior art.

[0005] In order to achieve the above-mentioned object, a first aspect of an embodiment of the present application provides a power supply system for a high-speed serial interface, the power supply system comprising:

[0006] High-speed serial interface communication module, used for transmission of high-frequency signals;

[0007] A coaxial cable filter module is connected to the high-speed serial interface communication module. The coaxial cable filter module includes an inductor corresponding to the operating frequency required by the high-speed serial interface communication module, and is used to provide the high-speed serial interface communication module with the operating frequency required for high-frequency communication;

[0008] The DC voltage input module is connected to the coaxial cable filter module and is used to provide a DC voltage to the coaxial cable filter module.

[0009] In an embodiment of the present application, the coaxial cable filter module further includes a resistor connected in parallel with the inductor, and the resistor is used to fix the frequency of the inductor within a preset frequency band.

[0010] In an embodiment of the present application, the coaxial cable filtering module includes: a first inductor, the first inductor is connected to the high-speed serial interface communication module, and is used to provide the high-speed serial interface communication module with a first operating frequency required by a reverse channel.

[0011] In the embodiment of the present application, the coaxial cable filtering module further includes: a second inductor, which is connected to the first inductor and is used to maintain the second operating frequency of the high-speed serial interface communication module.

[0012] In an embodiment of the present application, the coaxial cable filtering module also includes: a third inductor, the two ends of which are respectively connected to the second inductor and the DC voltage input module, for providing the third operating frequency required for the forward channel to the high-speed serial interface communication module.

[0013] In the embodiment of the present application, the inductance value of the first inductor is smaller than the inductance value of the second inductor, and the inductance value of the second inductor is smaller than the inductance value of the third inductor.

[0014] In an embodiment of the present application, the high-speed serial interface communication module includes: a serializer, which is connected to a deserializer through a high-frequency communication circuit, and is used to merge multiple parallel data streams into a high-speed serial data stream and send it to the deserializer; a deserializer, which is used to decompose a serial data stream into multiple parallel data streams and send them to the serializer.

[0015] In an embodiment of the present application, the high-speed serial interface communication module further includes a DC power blocking element connected in series to the high-frequency communication circuit, for blocking the DC power through the high-frequency signal.

[0016] In an embodiment of the present application, the high-speed serial interface communication module further includes an anti-static element connected in parallel with the deserializer to prevent electrostatic interference.

[0017] In an embodiment of the present application, the DC voltage input module includes: a power supply element for providing power; a power protector, wherein the two ends of the power protector are respectively connected to the power supply element and the coaxial cable filter module, and are used to convert the power input by the power supply element into a stable DC voltage and output it to the coaxial cable filter module.

[0018] The above technical solution provides a power supply system for a high-speed serial interface, including a high-speed serial interface communication module, a coaxial cable filter module and a coaxial cable filter module, the coaxial cable filter module is connected to the high-speed serial interface communication module, and the coaxial cable filter module includes an inductor corresponding to the operating frequency required by the high-speed serial interface communication module, which is used to provide the high-speed serial interface communication module with the operating frequency required for high-frequency communication. In this application, the output frequency of the coaxial cable filter module corresponds to the operating frequency required by the high-speed serial interface communication module, and can be compatible with different camera interface standards. When the vehicle needs to change the camera interface standard, there is no need to redesign the circuit, which is conducive to cost saving.

[0019] Other features and advantages of the embodiments of the present application will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present application, but do not constitute a limitation on the embodiments of the present application. In the accompanying drawings:

[0021] Figure 1 A structural block diagram of a power supply system for a high-speed serial interface provided in an embodiment of the present application;

[0022] Figure 2 A schematic diagram of a GMSL1 and GMSL2 compatible power supply system provided in a specific embodiment of the present application.

[0023] Description of Reference Numerals

[0024] 100 High-speed serial interface communication module 200 Coaxial cable filter module

[0025] 300 DC Voltage Input Module DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the specific implementation methods described herein are only used to illustrate and explain the embodiments of the present application, and are not used to limit the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0027] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back...), the directional indications 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.

[0028] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0029] Figure 1 The present invention provides a block diagram of a power supply system for a high-speed serial interface. Figure 1 As shown, an embodiment of the present application provides a power supply system for a high-speed serial interface, the power supply system comprising:

[0030] High-speed serial interface communication module 100, used for transmitting high-frequency signals;

[0031] The coaxial cable filter module 200 is connected to the high-speed serial interface communication module 100. The coaxial cable filter module 200 includes an inductor corresponding to the operating frequency required by the high-speed serial interface communication module 100, and is used to provide the high-speed serial interface communication module 100 with the operating frequency required for high-frequency communication;

[0032] The DC voltage input module 300 is connected to the coaxial cable filter module 200 and is used to provide a DC voltage to the coaxial cable filter module 200 .

[0033] In the embodiments of the present application, the high-speed serial interface mainly refers to the Gigabit Multimedia Serial Link, including GMSL1 and GMSL2. In general, the POC filter of the traditional old version of the Gigabit Multimedia Serial Link is not compatible with the new version of the Gigabit Multimedia Serial Link, for example, the POC filter of GMSL1 is not compatible with GMSL2. Therefore, when a vehicle equipped with an old version of the Gigabit Multimedia Serial Link needs to upgrade the camera to improve the camera resolution, in order to meet the upgraded standards, the internal circuits of the vehicle must also be adjusted accordingly, which requires a relatively high cost. For example, a vehicle equipped with the GMSL1 standard needs to be upgraded to GMSL2. Since the POC filter of GMSL1 is not compatible with GMSL2, the circuit designed for GMSL1 will not be able to be used and needs to be redesigned. In this regard, the embodiments of the present application provide a power supply system for a high-speed serial interface, which can be compatible with different standard versions of Gigabit Multimedia Serial Links.

[0034] Specifically, the power supply system for the high-speed serial interface in the embodiment of the present application includes a high-speed serial interface communication module 100, a coaxial cable filter module 200 and a DC voltage input module 300. Among them, the high-speed serial interface communication module 100 refers to a transmission line including a serializer and a deserializer, which is mainly used for the transmission of high-frequency signals. The DC voltage input module 300 is mainly used to provide a DC voltage to the coaxial cable filter module 200. The coaxial cable filter module 200 is a POC filter, and the coaxial cable filter module 200 is connected to the DC voltage input module 300 and the high-speed serial interface communication module 100 respectively, and is used to provide the high-speed serial interface communication module 100 with the operating frequency required for high-frequency communication on the basis of receiving the power supply of the DC voltage input module 300. It should be noted that the frequency band range of the operating frequency provided by the coaxial cable filter module 200 to the high-speed serial interface communication module 100 is determined by the frequency band range required for the high-speed serial interface communication module 100 to work, and the inductance value of the inductor in the coaxial cable filter module 200 can be determined by experiments according to the required frequency band range. In an example, the range of the operating frequency output by the coaxial cable filter module 200 can cover the operating frequency bands required by GMSL1 and GMSL2.

[0035] Specifically, taking GMSL1 and GMSL2 as examples, in order to make the power supply system compatible with both GMSL1 and GMSL2, the coaxial cable filter module 200 must be able to cover the frequency range of GMSL1 and GMSL2 at the same time when the forward channel and reverse channel of the high-speed serial interface communication module 100 are working. Based on this, according to the working frequency range of GMSL1 and GMSL2, the inductance value of the inductor in the coaxial cable filter module 200 is determined through experiments, so that the working frequency range output by the coaxial cable filter module 200 covers the working frequency range of GMSL1 and GMSL2. In this way, when the vehicle uses the power supply system, whether it is first using the GMSL1 standard and then upgrading to the GMSL2 standard, or first using the GMSL2 standard and then upgrading to the GMSL1 standard, the power supply system is compatible, so there is no need to redesign the circuit, which is conducive to cost saving.

[0036] The above technical solution provides a power supply system for a high-speed serial interface, including a high-speed serial interface communication module, a coaxial cable filter module and a coaxial cable filter module, the coaxial cable filter module is connected to the high-speed serial interface communication module, and the coaxial cable filter module includes an inductor corresponding to the operating frequency required by the high-speed serial interface communication module, which is used to provide the high-speed serial interface communication module with the operating frequency required for high-frequency communication. In this application, the output frequency of the coaxial cable filter module corresponds to the operating frequency required by the high-speed serial interface communication module, and can be compatible with different camera interface standards. When the vehicle needs to change the camera interface standard, there is no need to redesign the circuit, which is conducive to cost saving.

[0037] In the embodiment of the present application, the coaxial cable filter module 200 further includes a resistor connected in parallel with the inductor, and the resistor is used to fix the frequency of the inductor within a preset frequency band.

[0038] It can be understood that when the coaxial cable filter module 200, i.e., the POC filter, is working, under different current conditions, the larger the current, the less ideal the corresponding frequency curve, and the greater the difference from the designed target value. This is mainly because the effective inductance decreases as the current increases. Due to the decrease in effective inductance, the impedance at higher frequencies is usually lower, and the frequency curve will shift to the right, and may completely move out of the required frequency band range. In order to control the offset of the curve, the coaxial cable filter module 200 in the embodiment of the present application also includes a resistor connected in parallel with the inductor. The corresponding resistor is connected in parallel at the inductor, which will suppress this frequency drift and fix the frequency within a certain frequency band.

[0039] In the embodiment of the present application, the coaxial cable filter module 200 may include a first inductor connected to the high-speed serial interface communication module 100 to provide the high-speed serial interface communication module 100 with a first operating frequency required by a reverse channel.

[0040] Specifically, the first operating frequency refers to the operating frequency required by the reverse channel of the high-speed serial interface communication module 100. The first inductor is connected to the high-speed serial interface communication module 100 to provide the operating frequency when the high-speed serial interface performs reverse channel communication.

[0041] In the embodiment of the present application, the coaxial cable filter module 200 may further include a second inductor connected to the first inductor, for maintaining the second operating frequency of the high-speed serial interface communication module 100 .

[0042] Specifically, the second operating frequency refers to a general operating frequency required by the high-speed serial interface communication module 100. The second inductor is connected to the first inductor to maintain the general operating frequency of the high-speed serial interface communication module 100.

[0043] In an embodiment of the present application, the coaxial cable filter module 200 may further include a third inductor, the two ends of which are respectively connected to the second inductor and the DC voltage input module 300, for providing the high-speed serial interface communication module 100 with a third operating frequency required for the forward channel.

[0044] Specifically, the third operating frequency refers to the operating frequency required by the forward channel of the high-speed serial interface communication module 100. The third inductor is connected to the second inductor and the DC voltage input module 300 respectively, and is used to provide the operating frequency when the high-speed serial interface performs forward channel communication.

[0045] In the embodiment of the present application, the inductance value of the first inductor is smaller than the inductance value of the second inductor, and the inductance value of the second inductor is smaller than the inductance value of the third inductor.

[0046] Specifically, the coaxial cable filter module 200 is composed of a first inductor, a second inductor and a third inductor connected in series, wherein the inductance value of the first inductor is the minimum value among the three, and the inductance value of the third inductor is the maximum value among the three. The maximum value determines the low frequency of the reverse channel of the high-speed serial interface communication module 100, and the minimum value determines the high frequency of the forward channel.

[0047] In an embodiment of the present application, the high-speed serial interface communication module 100 may include a serializer and a deserializer interconnected by a high-frequency communication circuit, wherein the serializer is used to merge multiple parallel data streams into a high-speed serial data stream and send it to the deserializer, and the deserializer is used to decompose a serial data stream into multiple parallel data streams and send them to the serializer.

[0048] It can be understood that the serializer can also be called a transmitter, and the deserializer can also be called a receiver. The high-speed serial interface module consists of a serializer and a deserializer. The serializer and the deserializer can transmit signals to each other. The transmission channel from the serializer to the deserializer is the forward channel, and the transmission channel from the deserializer to the serializer is the reverse channel. Among them, the serializer can merge multiple parallel data streams into a high-speed serial data stream and send it to the deserializer, and the deserializer can decompose a serial data stream into multiple parallel data streams and send them to the serializer. In this way, the transmission of high-frequency signals is achieved through the serializer and the deserializer.

[0049] In the embodiment of the present application, the high-speed serial interface communication module 100 further includes a DC power blocking element connected in series to the high-frequency communication circuit, for blocking the DC power through the high-frequency signal.

[0050] It can be understood that the high-frequency communication circuit is the transmission circuit where the serializer and the deserializer are located. Since the high-frequency communication circuit only needs to realize the transmission of high-frequency signals, and does not need to be connected to the DC voltage output by the DC voltage input module 300, in order for the high-frequency communication circuit to pass the high-frequency signal and block the DC power supply. In the embodiment of the present application, the high-frequency communication circuit of the high-speed serial interface communication module 100 is also connected in series with a DC power blocking element, which can block the DC power supply and pass the high-frequency signal. Preferably, the DC power blocking element can be a capacitor or other element.

[0051] In the embodiment of the present application, the high-speed serial interface communication module 100 further includes an anti-static element connected in parallel with the deserializer to prevent electrostatic interference.

[0052] Specifically, the anti-static element is connected in parallel between the deserializer and the DC power blocking element to prevent electrostatic interference. Preferably, the anti-static element can be any component with anti-static function, such as a diode.

[0053] In an embodiment of the present application, the DC voltage input module 300 may include a power supply element and a power protector, wherein the power supply element is used to provide power to the power protector, and the two ends of the power protector are respectively connected to the power supply element and the coaxial cable filter module 200, which are used to convert the power input by the power supply element into a stable DC voltage and output it to the coaxial cable filter module 200.

[0054] In a specific embodiment of the present application, the power supply system is described as being compatible with GMSL1 and GMSL2. Figure 2 The schematic diagram of a GMSL1 and GMSL2 compatible power supply system provided in a specific embodiment of the present application. Figure 2As shown in the figure, the right end of the power supply system is the POC input DC power supply, which is generated by the buck-boost power supply of the previous stage, and then converted to a stable DC voltage of 12V through the power protector. The left end is the GMSL high-frequency signal transmitted from the transmitter (serializer) to the receiver (deserializer) for communication. A capacitor is connected in series in the middle to block the DC power supply through the high-frequency signal. In addition, a diode is connected in parallel between the capacitor and the receiver to prevent electrostatic interference. Figure 2 The middle part is the POC filter circuit, which is composed of an inductor and a resistor.

[0055] It can be understood that in order to make the POC circuits of GMSL2 and GMSL1 compatible, referring to the design of GMSL1, the POC filter circuit in the power supply system adopts a three-order inductor L1L2L3 series mode, and each inductor is connected in parallel with a resistor. Among them, L1 is the maximum inductance, providing the operating frequency of the reverse channel. L2 is the median inductance, maintaining the general operating frequency, and L3 is the minimum inductance, providing the highest operating frequency of the forward channel. In addition, the compatible design of the POC filter circuit must be able to cover the GMSL1 and GMSL2 frequency ranges at the same time when the forward channel and the reverse channel are working. According to the operating frequency range of GMSL1 and GMSL2, to be compatible with GMSL1 and GMSL2, the forward channel operating frequency must be within 3.5GHz, and the reverse channel operating frequency must be within 50kHz. The frequency that the POC filter circuit can provide is determined by the inductance value of the inductor, and the inductance value of the inductor can be determined through experiments based on actual conditions. In this way, the POC filter circuit can be compatible with the POC transmission line power supply of GMSL1 and GMSL2 signals, effectively solving the multiplexing problem of GMSL1 and GMSL2.

[0056] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0057] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A power supply system for a high-speed serial interface, characterized in that: The power supply system comprises: High-speed serial interface communication module, used for transmission of high-frequency signals; A coaxial cable filter module is connected to the high-speed serial interface communication module, wherein the coaxial cable filter module includes an inductor corresponding to the operating frequency required by the high-speed serial interface communication module, and is used to provide the high-speed serial interface communication module with the operating frequency required for high-frequency communication; A DC voltage input module is connected to the coaxial cable filter module and is used to provide a DC voltage to the coaxial cable filter module.

2. The power supply system according to claim 1, characterized in that: The coaxial cable filter module further includes a resistor connected in parallel with the inductor, and the resistor is used to fix the frequency of the inductor within a preset frequency band.

3. The power supply system according to claim 1, characterized in that: The coaxial cable filter module comprises: A first inductor is connected to the high-speed serial interface communication module and is used to provide the high-speed serial interface communication module with a first operating frequency required by a reverse channel.

4. The power supply system according to claim 3, characterized in that: The coaxial cable filter module also includes: A second inductor, the second inductor is connected to the first inductor and is used to maintain a second operating frequency of the high-speed serial interface communication module.

5. The power supply system according to claim 4, characterized in that: The coaxial cable filter module also includes: A third inductor, two ends of which are respectively connected to the second inductor and the DC voltage input module, and is used to provide the high-speed serial interface communication module with a third operating frequency required by a forward channel.

6. The power supply system according to claim 5, characterized in that: The inductance value of the first inductor is smaller than the inductance value of the second inductor, and the inductance value of the second inductor is smaller than the inductance value of the third inductor.

7. The power supply system according to claim 1, characterized in that: The high-speed serial interface communication module comprises: A serializer, connected to the deserializer via a high-frequency communication circuit, for combining multiple parallel data streams into a high-speed serial data stream and sending it to the deserializer; The deserializer is used to decompose a serial data stream into multiple parallel data streams and send the parallel data streams to the serializer.

8. The power supply system according to claim 7, characterized in that: The high-speed serial interface communication module further includes a DC power blocking element connected in series to the high-frequency communication circuit, for passing the high-frequency signal and blocking the DC power.

9. The power supply system according to claim 7, characterized in that: The high-speed serial interface communication module also includes an anti-static element connected in parallel with the deserializer to prevent electrostatic interference.

10. The power supply system according to claim 1, characterized in that: The DC voltage input module comprises: A power supply element, used for providing power; A power protector, with two ends of the power protector connected to the power supply element and the coaxial cable filter module respectively, for converting the power input by the power supply element into a stable DC voltage and outputting it to the coaxial cable filter module.

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