Signal transmission circuit and vehicle
By using a combination of power supply, first resistor and coaxial high-speed signal line in low current scenarios to replace complex inductor matching, low-cost signal transmission is achieved, the problem of high inductor cost is solved, and high-speed and stable signal transmission is ensured.
Patent Information
- Application Number
- CN202410448002.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-12
- Publication Date
- 2025-10-21
AI Technical Summary
In low-current scenarios, the existing PoC method has high inductor costs, which increases the cost of wiring harnesses and components. It also requires adding PoC circuits to the serializer and deserializer chips, increasing debugging and testing costs.
A combination of a power supply, a first resistor, a coaxial high-speed signal line, and a second resistor is used to load electrical signals onto the coaxial high-speed signal line through current limiting and voltage division, replacing complex multi-stage inductor matching to achieve low-cost signal transmission.
It reduces the cost of wiring harnesses and components, reduces debugging and testing costs, and ensures high-speed and stable transmission of signals in low-current scenarios.
Smart Images
Figure CN120825354A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of signal transmission technology, and in particular to a signal transmission circuit and a vehicle. Background Art
[0002] To meet the needs of coaxial high-speed signals and the need to load other DC signals, the industry currently relies on coaxial cables to transmit video signals, coaxial control, and power over Coaxia (PoC). However, PoC methods generally operate in current scenarios of 300mA or above, so the inductors used in PoC are generally designed for currents around this level or greater.
[0003] However, in low-current scenarios, the current demand is very small, but the PoC inductors on the market are all 300mA, which will lead to increased costs. In actual applications, PoC circuits need to be added to both the serializer chip and the deserializer chip, which is very expensive. Summary of the Invention
[0004] The present disclosure provides a signal transmission circuit and a vehicle.
[0005] According to a first aspect of the present disclosure, there is provided a signal transmission circuit, the circuit comprising:
[0006] A power supply, a first resistor, a coaxial high-speed signal line, and a second resistor;
[0007] A power supply is connected to the first side of the first resistor and is used to provide an electrical signal to the first resistor;
[0008] The second side of the first resistor is connected to the second resistor through a coaxial high-speed signal line, and is used to transmit an electrical signal to the second resistor.
[0009] In some embodiments, the circuit includes a follower, the second side of the second resistor is connected to the first side of the follower, and the second side of the follower is connected to the signal output port.
[0010] In some embodiments, the circuit includes: a third resistor, a first side of the third resistor being connected to the second side of the second resistor and the first side of the follower respectively, and a second side of the third resistor being grounded.
[0011] In some embodiments, the circuit includes: a serializer chip and a deserializer chip, and the serializer chip is connected to the deserializer chip through a coaxial high-speed signal line.
[0012] In some embodiments, the circuit includes: a first circuit board and a second circuit board; a power supply, a first resistor, and a serializer chip are located on the first circuit board; a second resistor, a third resistor, a follower, and a deserializer chip are located on the second circuit board.
[0013] In some embodiments, the coaxial high-speed signal line includes a first coaxial high-speed signal line and a second coaxial high-speed signal line, and the first coaxial high-speed signal line is connected to the second coaxial high-speed signal line through a coaxial connector.
[0014] In some embodiments, the second side of the first resistor and the serializer chip are both connected to the first coaxial high-speed signal line, and the first side of the second resistor and the deserializer chip are both connected to the second coaxial high-speed signal line.
[0015] In some embodiments, the resistance of the first resistor, the resistance of the second resistor, and the resistance of the third resistor are all greater than or equal to 1000 ohms.
[0016] In some embodiments, the maximum current value I supported by the signal transmission circuit is max satisfy: Among them, R a is the characteristic impedance of the coaxial high-speed signal line, R b is the parasitic impedance of the coaxial high-speed signal line, and V is the voltage of the coaxial high-speed signal line.
[0017] According to a second aspect of the present disclosure, a vehicle is provided, comprising the signal transmission circuit according to the first aspect.
[0018] According to an embodiment of the present disclosure, a signal transmission circuit is used, which includes: a power supply, a first resistor, a coaxial high-speed signal line and a second resistor; the power supply is connected to the first side of the first resistor for providing an electrical signal; the second side of the first resistor is connected to the second resistor through the coaxial high-speed signal line for transmitting the electrical signal to the second resistor, thereby realizing a low-cost solution for loading a low-current DC signal onto the coaxial high-speed signal line, without the need to use a complex multi-order inductor matching method, saving wiring harness costs, component costs and subsequent debugging and testing costs.
[0019] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] The accompanying drawings are provided to facilitate a better understanding of the present invention and do not constitute a limitation of the present disclosure.
[0021] Figure 1 A schematic diagram of an existing PoC circuit provided in an embodiment of the present disclosure;
[0022] Figure 2 A schematic diagram of an existing signal transmission method using PoC provided in an embodiment of the present disclosure;
[0023] Figure 3 A schematic structural diagram of a signal transmission circuit provided in an embodiment of the present disclosure;
[0024] Figure 4 A schematic diagram of a specific signal transmission circuit provided in an embodiment of the present disclosure;
[0025] Figure 5 A schematic diagram of a specific signal transmission circuit performing signal transmission provided in an embodiment of the present disclosure. DETAILED DESCRIPTION
[0026] The following description of exemplary embodiments of the present disclosure is made in conjunction with the accompanying drawings, including various details of the embodiments of the present disclosure to facilitate understanding. These details should be considered as merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present disclosure. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.
[0027] A signal transmission circuit and a vehicle according to an embodiment of the present disclosure will be described below with reference to the accompanying drawings.
[0028] like Figure 1 Shown is a schematic diagram of an existing PoC circuit and Figure 2 Schematic diagram of an existing signal transmission method using PoC. Figure 1 The PoC circuit is mainly composed of inductors, which have a certain impedance to AC signals and isolate the coupling interference between DC voltage and AC signals. In the PoC circuit, Part 1, Part 2 and Part 3 all use different inductors. The difference in inductance is mainly due to the power and impedance difference in different frequency bands. By matching different inductors, the equivalent impedance of the PoC part is guaranteed to be above 1K, ensuring an impedance difference of more than 20 times. Figure 2 , the existing signal transmission method adopts Figure 1 The PoC circuit in the serializer chip and the deserializer chip are connected to the PoC circuit respectively, so as to superimpose a DC signal on the coaxial high-speed signal line between the serializer chip and the deserializer chip.
[0029] As can be seen, in low-current scenarios, the current demand is very small, but the PoC inductors on the market are all 300mA, which will lead to increased costs. In actual applications, PoC circuits need to be added to both the serializer chip and the deserializer chip, which is very expensive.
[0030] In response to the problems of the above-mentioned related technologies, the present invention implements a low-cost solution in the scenario of loading low-current DC signals onto coaxial high-speed signal lines, abandons the use of complex multi-order inductor matching methods, and realizes the loading of electrical signals onto coaxial high-speed signal lines, thereby reducing wiring harness costs, component costs, and subsequent debugging and testing costs.
[0031] A signal transmission circuit and a vehicle proposed in the present disclosure are described in detail below with reference to the accompanying drawings.
[0032] refer to Figure 3 , Figure 3 FIG. 1 is a schematic diagram showing the structure of a signal transmission circuit provided by an embodiment of the present disclosure. Figure 3 As shown, the signal transmission circuit is applied to low current scenarios, and the signal transmission circuit includes:
[0033] Power supply 1, first resistor 2, coaxial high-speed signal line 3 and second resistor 4;
[0034] The power supply 1 is connected to the first side of the first resistor 2 and is used to provide an electrical signal to the first resistor 2;
[0035] The second side of the first resistor 2 is connected to the second resistor 4 through a coaxial high-speed signal line 3 for transmitting an electrical signal to the second resistor 4 .
[0036] The first resistor 2 has a voltage stabilizing effect in the signal transmission circuit, ensuring that the output voltage is not affected by changes in the input voltage, thereby maintaining stability. Furthermore, the first resistor 2 can also act as a current limiter in the signal output circuit, limiting the current flowing from the power supply to the coaxial high-speed signal line, preventing excessive current from damaging the signal line or other circuit components. The present disclosure connects the first resistor 2 to the power supply 1 to adjust the electrical signal to a voltage level suitable for transmission on the coaxial high-speed signal line.
[0037] The coaxial high-speed signal line 3 is a special transmission line used for high-speed signal transmission. In the signal transmission circuit disclosed herein, the coaxial high-speed signal line 3 connects the second side of the first resistor 2 and the first side of the second resistor 4 as a transmission path for the electrical signal.
[0038] The second resistor 4 serves a similar purpose in the signal transmission circuit as the first resistor 2, again limiting the current to ensure that the received electrical signal remains within a safe range. Furthermore, the second resistor 4 can also cooperate with subsequent circuit components to further process the received electrical signal.
[0039] The present invention uses a power supply to provide an electrical signal. After current limiting and voltage dividing by the first resistor 2, the electrical signal is loaded onto the coaxial high-speed signal line 3. The electrical signal is then transmitted through the coaxial high-speed signal line 3 to the second resistor 4, and finally reaches the target device or component. In this process, the coaxial high-speed signal line 3 effectively ensures high-speed and stable signal transmission, while the two resistors protect the circuit and adjust the signal, achieving the low-cost goal of the present invention in low-current scenarios.
[0040] It should be noted that the specific design and parameters of the signal transmission circuit (such as the resistance value of the resistor, the voltage of the power supply, etc.) need to be determined according to the actual application scenario and requirements to ensure the performance and safety of the circuit, and are not limited in the embodiments of the present disclosure.
[0041] In the embodiments of the present disclosure, Figure 4 The schematic diagram of a specific signal transmission circuit shown in FIG. 4 further includes: a follower 5 , a second side of the second resistor 4 is connected to a first side of the follower 5 , and a second side of the follower 5 is connected to a signal output port.
[0042] During signal transmission, especially when signal lines are long or other attenuation factors are present, the driving capability of the electrical signal (DC signal) may be weakened, resulting in unstable or insufficient signal strength when received by the other end. To solve this problem, a follower circuit can be used to enhance the signal driving capability. This increases the reliability of both voltage-controlled and flow-controlled components.
[0043] The main function of the follower circuit (also known as the buffer circuit) is to amplify the input electrical signal and provide a low-impedance output to enhance the driving ability of the electrical signal. It usually consists of an amplifier with high input impedance and low output impedance to ensure that the signal will not be attenuated or distorted during transmission.
[0044] Among them, the follower can select appropriate follower circuit design and parameters according to actual needs to ensure that the signal can achieve the required driving capability after enhancement, which is not limited in the embodiments of the present disclosure.
[0045] In the embodiments of the present disclosure, referring to Figure 4 The signal transmission circuit further includes: a third resistor 6, a first side of the third resistor 6 is respectively connected to the second side of the second resistor 4 and the first side of the follower 5, and a second side of the third resistor 6 is grounded.
[0046] In the signal transmission circuit, the third resistor 6 is connected between the input terminal of the follower 5 and the ground line, and can divide the voltage of the received electrical signal. This ensures that the follower 5 receives a suitable signal level, and will not be saturated due to an overly strong signal, nor will it be effectively driven due to a signal that is too weak. At the same time, the introduction of the third resistor 6 in the signal transmission circuit can prevent the coaxial high-speed signal line 3 from being directly connected to the follower 5, avoiding a negative impact on high-speed signal transmission. It also reduces the direct impact of the high-speed signal on the follower input terminal, ensuring that the follower can stably and accurately process DC signals.
[0047] In the embodiments of the present disclosure, referring to Figure 4 The signal transmission circuit includes: a serializer chip 7 and a deserializer chip 8, and the serializer chip 7 is connected to the deserializer chip 8 through a coaxial high-speed signal line 3.
[0048] In the embodiment of the present disclosure, the serializer chip 7 and the deserializer chip 8 are connected via the coaxial high-speed signal line 3, thereby achieving efficient and stable transmission of high-speed signals.
[0049] The main function of the serializer chip 7 is to convert parallel data into serial data to meet the transmission requirements of high-speed signal lines. By serializing parallel data, the number of transmission lines can be reduced, reducing system complexity and cost. The serializer chip 7 also performs functions such as data encoding and synchronization signal generation to ensure data integrity and accuracy.
[0050] The deserializer chip 8 is responsible for converting the received serial data back into parallel data for use by subsequent circuits or components. The deserializer chip 8 typically contains clock recovery and data retiming circuitry, which extracts the clock signal from the serial data stream and uses it to sample and recover the data. This enables the deserializer chip 8 to accurately parse the received data and convert it into a usable parallel data format.
[0051] The coaxial high-speed signal line 3, serving as the connection medium between the serializer chip 7 and the deserializer chip 8, has excellent electromagnetic shielding performance and transmission speed. It can effectively reduce signal attenuation and interference during transmission, ensuring high-speed and stable data transmission.
[0052] It should be noted that the coaxial high-speed signal 3 in the present disclosure can be a single-ended coaxial high-speed signal line or a coaxial high-speed signal line between the serializer chip 7 and the deserializer chip 8. The specific implementation is based on actual conditions and is not limited in the present embodiment. The selection and configuration of the serializer chip 7 and the deserializer chip 8 should be based on specific application needs and system requirements and are not limited in the present embodiment.
[0053] In the embodiments of the present disclosure, referring to Figure 4The signal transmission circuit includes: a first circuit board 9 and a second circuit board 10; a power supply 1, a first resistor 2, and a serializer chip 7 are located on the first circuit board 9; a second resistor 4, a third resistor 6, a follower 5 and a deserializer chip 8 are located on the second circuit board 10.
[0054] In the embodiments of the present disclosure, referring to Figure 4 The coaxial high-speed signal line 3 includes a first coaxial high-speed signal line 31 and a second coaxial high-speed signal line 32 , and the first coaxial high-speed signal line 31 is connected to the second coaxial high-speed signal line 32 through a coaxial connector 33 .
[0055] In the embodiments of the present disclosure, by distributing different circuit components on two circuit boards, namely, a first circuit board 9 and a second circuit board 10, not only is circuit assembly and maintenance facilitated, but the reliability and stability of the overall circuit are also improved. The first circuit board 9 and the second circuit board 10 may be printed circuit boards (PCBs).
[0056] The first circuit board 9 integrates the power supply 1, the first resistor 2, and the serializer chip 7, forming the output end of the signal transmission. The second circuit board 10 integrates the second resistor 4, the third resistor 6, the follower 5, and the deserializer chip 8, forming the input end of the signal transmission.
[0057] The coaxial high-speed signal line 3 consists of a first coaxial high-speed signal line 31 at the output end and a second coaxial high-speed signal line 32 at the input end, and is connected via a coaxial connector 33. The second side of the first resistor 2 and the serializer chip 7 are both connected to the first coaxial high-speed signal line 31, and the first side of the second resistor 4 and the deserializer chip 8 are both connected to the second coaxial high-speed signal line 32. This design allows the signal transmission circuit to be physically separated into two parts while still maintaining high-speed and stable signal transmission. The coaxial connector ensures seamless transmission of signals between the two sections of the coaxial high-speed signal line, reducing the possibility of signal loss and interference.
[0058] This modular and distributed circuit design not only improves the reliability and stability of the circuit, but also facilitates the expansion and upgrade of the signal transmission circuit.
[0059] In the embodiment of the present disclosure, the resistance of the first resistor 2 , the resistance of the second resistor 4 , and the resistance of the third resistor 6 are all greater than or equal to 1000 ohms.
[0060] In the signal transmission circuit, the present disclosure uses a resistor to replace the inductor of PoC to simplify the signal transmission circuit design while ensuring that the signal quality meets the driving requirements of the DC signal in high-speed signal transmission.
[0061] When selecting resistor values, it is necessary to ensure that the resistor connected to the high-speed signal line has a value greater than or equal to 1000 ohms. This is to achieve a characteristic impedance coefficient of at least 20 times. The characteristic impedance coefficient is a key parameter of the transmission line, which determines the transmission characteristics of the signal. By selecting a resistor value greater than or equal to 1000 ohms, the present disclosure can make the reflection coefficient p close to -1dB, and can ensure that the change in reflection loss (return loss) remains within -1dB.
[0062] Specifically, the reflection coefficient can be calculated using Formula 1:
[0063]
[0064] Where ZL is the impedance of the load and ZO is the characteristic impedance of the transmission line.
[0065] While a larger characteristic impedance coefficient—that is, a larger resistor value—reduces return loss, selecting a resistor value on the order of 10K further reduces return loss, but this also reduces the DC signal's current capability. This is because a larger resistor value impedes current flow, increasing DC signal attenuation during transmission. This can result in insufficient DC signal strength reaching the other end, making it ineffective in driving components with low-impedance inputs.
[0066] Therefore, the resistance values of the first resistor 2, the second resistor 4, and the third resistor 6 in the present disclosure must all be greater than or equal to 1000 ohms, and must also all be less than or equal to 10,000 ohms to ensure the normal operation of the signal transmission circuit. The specific values are not limited in the embodiments of the present disclosure and are mainly based on practical applications.
[0067] In the embodiment of the present disclosure, since the signal transmission circuit in the present disclosure is applied to a low current scenario, the maximum current value I supported by the signal transmission circuit is max satisfy: Among them, R a is the characteristic impedance of the coaxial high-speed signal line, R b is the parasitic impedance of the coaxial high-speed signal line, and V is the voltage of the coaxial high-speed signal line.
[0068] In summary, the signal transmission circuit disclosed herein superimposes a low-current DC signal on a coaxial high-speed signal line in low-current scenarios, thereby implementing signal transmission in the existing PoC manner. This eliminates the need for complex multi-stage inductor matching methods, saving wiring harness costs, component costs, and subsequent debugging and testing costs.
[0069] In an optional embodiment of the present disclosure, in order to realize the existing signal transmission function in the PoC mode in a low current scenario and meet the low cost requirement, such as Figure 5 As shown, the present disclosure provides a schematic diagram of a specific signal transmission circuit performing signal transmission.
[0070] Reference Figure 5 , a power supply, a first resistor and a serializer chip are integrated on the first circuit board (PCB1), wherein the power supply is connected to the first side of the first resistor, the second side of the first resistor is connected to the first coaxial high-speed signal line, and the serializer chip is connected to the first coaxial high-speed signal line. The second circuit board (PCB2) is integrated with a second resistor, a third resistor, a follower and a deserializer chip, wherein the first side of the second resistor is connected to the second coaxial high-speed signal line, the second side of the second resistor is connected to the first side of the third resistor and the first side of the follower. The first side of the third resistor is connected to the first side of the follower, the second side of the third resistor is grounded, and the second side of the follower is connected to the signal output port. The first coaxial high-speed signal line is connected to the second coaxial high-speed signal line through a coaxial connector.
[0071] In summary, the present disclosure provides a low-cost, high-reliability solution for loading all low-current drive-type DC signals onto high-speed coaxial signal lines.
[0072] According to an embodiment of the present disclosure, the present disclosure provides a vehicle. The aforementioned signal transmission circuit method can be applied to the vehicle, and the aforementioned signal transmission circuit device can be configured in the vehicle.
[0073] The vehicle provided by the embodiment of the present disclosure has the same technical features as the signal transmission circuit provided by the above embodiment, and therefore can also solve the same technical problems and achieve the same technical effects.
[0074] In addition, the vehicle described in the embodiment of the present disclosure may be a fuel vehicle, a pure electric vehicle, or a hybrid vehicle, etc., and the embodiment of the present disclosure does not specifically limit this.
[0075] In addition, in the description of the embodiments of the present disclosure, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present disclosure based on the specific circumstances.
[0076] In the description of this disclosure, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this disclosure and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this disclosure. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0077] Finally, it should be noted that the above embodiments are only specific implementation methods of the present disclosure, which are used to illustrate the technical solutions of the present disclosure, rather than to limit them. The protection scope of the present disclosure is not limited thereto. Although the present disclosure has been described in detail with reference to the above embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above embodiments within the technical scope disclosed in the present disclosure, or make equivalent replacements for some of the technical features therein. However, these modifications, changes, or replacements do not deviate from the essence of the corresponding technical solutions within the scope of the technical solutions of the embodiments of the present disclosure. They should all be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.
Claims
1. A signal transmission circuit, characterized in that: The circuit comprises: A power supply, a first resistor, a coaxial high-speed signal line, and a second resistor; The power supply is connected to the first side of the first resistor, and is used to provide an electrical signal to the first resistor; The second side of the first resistor is connected to the second resistor through the coaxial high-speed signal line, and is used to transmit the electrical signal to the second resistor.
2. The circuit according to claim 1, wherein: The circuit includes a follower, wherein the second side of the second resistor is connected to the first side of the follower, and the second side of the follower is connected to a signal output port.
3. The circuit according to claim 2, characterized in that The circuit includes a third resistor, a first side of the third resistor being connected to the second side of the second resistor and the first side of the follower respectively, and a second side of the third resistor being grounded.
4. The circuit according to claim 3, characterized in that The circuit includes: a serializer chip and a deserializer chip, and the serializer chip is connected to the deserializer chip through the coaxial high-speed signal line.
5. The circuit according to claim 4, characterized in that The circuit comprises: a first circuit board and a second circuit board; The power supply, the first resistor, and the serializer chip are located on the first circuit board; The second resistor, the third resistor, the follower, and the deserializer chip are located on the second circuit board.
6. The circuit according to claim 5, characterized in that The coaxial high-speed signal line includes a first coaxial high-speed signal line and a second coaxial high-speed signal line, and the first coaxial high-speed signal line is connected to the second coaxial high-speed signal line through a coaxial connector.
7. The circuit according to claim 6, characterized in that The second side of the first resistor and the serializer chip are both connected to the first coaxial high-speed signal line, and the first side of the second resistor and the deserializer chip are both connected to the second coaxial high-speed signal line.
8. The circuit according to claim 3, characterized in that The resistance of the first resistor, the resistance of the second resistor, and the resistance of the third resistor are all greater than or equal to 1000 ohms.
9. The circuit according to claim 1, wherein: The maximum current value I supported by the signal transmission circuit max satisfy: Among them, R a is the characteristic impedance of the coaxial high-speed signal line, R b is the parasitic impedance of the coaxial high-speed signal line, and V is the voltage of the coaxial high-speed signal line.
10. A vehicle, characterized in that: The method comprises the signal transmission circuit according to any one of claims 1 to 9.