CN109543215B - Vehicle-mounted Ethernet filter circuit and control method - Google Patents
Vehicle-mounted Ethernet filter circuit and control method Download PDFInfo
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- CN109543215B CN109543215B CN201811188461.0A CN201811188461A CN109543215B CN 109543215 B CN109543215 B CN 109543215B CN 201811188461 A CN201811188461 A CN 201811188461A CN 109543215 B CN109543215 B CN 109543215B
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/39—Circuit design at the physical level
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0216—Reduction of cross-talk, noise or electromagnetic interference
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/0213—Electrical arrangements not otherwise provided for
- H05K1/0237—High frequency adaptations
Abstract
The invention relates to the technical field of vehicle-mounted Ethernet, and particularly discloses a vehicle-mounted Ethernet filter circuit and a control method thereof.
Description
Technical Field
The invention relates to the technical field of vehicle-mounted Ethernet, in particular to a vehicle-mounted Ethernet filter circuit and a control method.
Background
The data frequency of the vehicle-mounted Ethernet transmission is high and the data rate is high, and the transmitted data volume is large, so that the complexity of the system can be obviously reduced, the types and the number of connecting wire harnesses can be reduced, the wiring density and the space can be reduced, and the connection of the system can be optimized.
However, the vehicle-mounted ethernet has high requirements on signal quality, is particularly sensitive to interference signals or noise, is easy to cause abnormal conditions such as data packet loss, data transmission interruption and the like due to severe environment and external interference, and aiming at the problems, the traditional method is to use a filter circuit formed by a separating device, namely a resistor, a capacitor, an inductor and the like to filter the interference signals so as to improve the anti-interference capability of the vehicle-mounted ethernet signals; however, in practical application, the randomness of tolerance of the separation device and the discreteness of parameter values limit the filtering effect and the application range; the filter circuit formed by the separating devices is formed by a plurality of separating devices, occupies a large PCB space, and causes difficult wiring under the condition of limited PCB space; the temperature coefficient of the separation device determines that the device parameters are easily affected by temperature, and the performance of the filter circuit is easily deteriorated, and the circuit is unstable.
Disclosure of Invention
Aiming at the technical problems, the invention provides a vehicle-mounted Ethernet filter circuit and a control method for adjusting the driving capability and the working frequency of the circuit according to the change condition of load voltage and improving the working stability of the circuit.
In order to solve the technical problems, the invention provides the following specific scheme: the utility model provides a on-vehicle ethernet filter circuit, includes ETH circuit, ETH filter circuit, common mode inductance and load, ETH filter circuit is connected to the ETH circuit, ETH filter circuit connects the common mode inductance, the load is connected to the common mode inductance.
Preferably, the ETH circuit includes a current source, and a resistor R1 and a resistor R2 connected to two ends of the current source respectively.
Preferably, the ETH filter circuit includes a feedback detection circuit, a frequency control circuit, a first amplifier and a second amplifier connected with two ends of the frequency control circuit respectively, the feedback detection circuit is connected with the frequency control circuit and the second amplifier, and the second amplifier is connected with a constant current source.
The invention also provides a control method of the vehicle-mounted Ethernet filter circuit, which comprises the following steps that the ETH filter circuit outputs constant current outwards, the load terminal generates voltage, the feedback detection circuit detects that the voltage drop of the circuit falls in a threshold range, the load is judged to work normally, and the ETH filter circuit is at the highest working frequency f CLK 。
Preferably, the feedback detection circuit detects that the voltage drop of the circuit is smaller than the minimum value of the set threshold range and larger than the set minimum working voltage V MIN When the ETH filter circuit is in a low-speed working mode, the feedback detection circuit outputs a control signal and adjusts the working frequency f of the frequency control circuit; the minimum operating voltage V MIN 200mV.
Preferably, the operating frequency f of the low-speed operating mode is the highest operating frequency f CLK 1/4 of (C).
Preferably, the feedback detection circuit detects that the voltage drop of the circuit is smaller than the set minimum operating voltage V MIN And when the ETH filter circuit is judged to be in an overload state, the feedback detection circuit outputs a control signal, the frequency control circuit is closed, and the ETH filter circuit is forbidden to output outwards.
Preferably, the feedback detection circuit detects that the voltage drop of the circuit is larger than the maximum value of the set threshold range and smaller than the set maximum working voltage V MAX When the ETH filter circuit is in a half-speed working mode, the feedback detection circuit outputs a control signal, adjusts the working frequency f of the frequency control circuit, and the maximum working voltage V MAX 500mV.
Preferably, the feedback detection circuit detects that the voltage drop generated by the load terminal is greater than the set maximum operating voltage V MAX And when the ETH filter circuit is judged to be in an overvoltage working state, the feedback detection circuit outputs a control signal, the frequency control circuit is forcibly turned off, and the ETH filter circuit is forbidden to output outwards.
Preferably, the threshold value ranges from 225mV to 275mV.
Compared with the prior art, the invention has the beneficial effects that: the invention is composed of circuit modules, devices are integrated in the modules, the occupied PCB space is small, and wiring is very easy according to the requirement of differential signals; the circuit mainly comprises an amplifier, the influence of temperature drift and bias current is restrained by a compensation circuit of the amplifier, the precision and tolerance of the circuit depend on the precision and tolerance of an external application circuit, and the anti-interference capability of the circuit depends on the driving capability and parameter adjustment of the circuit; the circuit can detect the change of the voltage of the load end, adjust the driving capability of the circuit according to the change condition of the load voltage, adjust the working frequency of the circuit and improve the working stability of the circuit.
Drawings
FIG. 1 is a circuit connection block diagram of a first embodiment of the present invention;
FIG. 2 is a graph of line drop versus operating frequency;
FIG. 3 is a circuit diagram showing a feedback detection circuit;
FIG. 4 is a signal connection diagram of a frequency control circuit;
fig. 5 is a flowchart of a specific method according to a second embodiment of the present invention.
Detailed Description
In order to describe the technical solution of the present invention in detail, the following description will be made clearly and completely by referring to the drawings of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention.
Embodiment one:
referring to fig. 1 and 2, the present embodiment provides a vehicle-mounted Ethernet filter circuit, which includes an ETH circuit, an ETH filter circuit, a common mode inductor and a load, where the ETH circuit is connected to the ETH filter circuit, the ETH filter circuit is connected to the common mode inductor, the common mode inductor is connected to the load, the common mode inductor suppresses common mode interference of an ETH signal, adjusts phase deviation between ethernet+ and Ethernet-, so that phases of the ethernet+ and Ethernet are balanced, balance of differential signals is enhanced, anti-interference capability of the Ethernet is improved, a termination resistor of 100 Ω is provided inside the load, a feedback voltage is provided for a feedback detection circuit of the ETH filter circuit, impedance matching is provided for an ETH signal trace, and interference and influence of the reflected signal on the ETH signal are suppressed; the ETH circuit comprises a current source, a resistor R1 and a resistor R2 which are respectively connected with two ends of the current source, wherein the other ends of the resistor R1 and the resistor R2 are respectively connected with an ETH filter circuit, the ETH filter circuit comprises a feedback detection circuit, a frequency control circuit, a first amplifier and a second amplifier which are respectively connected with two ends of the frequency control circuit, the feedback detection circuit is connected with the frequency control circuit and the second amplifier, the second amplifier is connected with a constant current source, two first amplifiers and two second amplifiers are arranged in the embodiment, a buffer isolation circuit is formed between the four amplifiers, the amplification factor is 1, the effects of impedance transformation and isolation buffer on ETH signals are mainly achieved in the circuit, the driving capability and the anti-interference capability of the ETH circuit are enhanced, and the working stability of the circuit is improved.
The ETH circuit generates differential Ethernet signals Ethernet+ and Ethernet-, and resistors R1 and R2 connected in series in the circuit serve as source end terminating resistors, so that the effect of impedance matching is achieved, reflection caused by unbalanced impedance and unmatched line is restrained, meanwhile, differential input signals are provided for the ETH filter circuit, the ETH filter circuit is isolated from a load, the influence of the load on the ETH circuit is reduced, meanwhile, the effect of buffering the differential signals of the Ethernet is achieved, the driving capacity and the working frequency of the circuit are adjusted according to the condition of the load, the anti-interference capacity of the circuit is improved, and the stability of the circuit in operation is guaranteed.
Specifically, the constant current source in the ETH filter circuit can output 2.5mA constant current to the outside, during normal operation, the constant current source in the ETH filter circuit outputs 2.5mA current to generate voltage on the terminal resistor of the load, the resistance value of the terminal resistor of the load in this embodiment is 100deg.m, therefore, the voltage generated by the terminal resistor of the load is 250mv, when the feedback detection circuit detects that the voltage drop of the circuit falls within the set threshold range a (225 mV-275 mV), the load is judged to be in normal operation, and the ETH filter circuit is in the highest operating frequency f CLK Opening a full-speed working mode to enable the Ethernet transmission speed of the ETH circuit and the load end to reach the maximum transmission speed when the bandwidth of the Ethernet is 100M; when the feedback detection circuit detects that the voltage drop of the detected line is smaller than the minimum value of the set threshold range A and is larger than the set minimum working voltage V MIN That is, when 200mV is reached, the feedback detection circuit outputs a control signal to adjust the operating frequency f of the frequency control circuit to 1/4 of the highest operating frequency, f CLK 4, the ETH filter circuit is in a low-speed working mode, so that the Ethernet transmission speed of the ETH circuit and the load end is reduced to 1/4 of the maximum transmission speed when the bandwidth of 100M is reduced, the driving capability of the ETH filter circuit is improved, and the stability of the circuit is improved; when the feedback detection circuit detects that the voltage drop of the circuit is smaller than the set minimum working voltage V MIN V at the time of MIN For 200mV, the ETH filter circuit is in an overload state, the feedback detection circuit outputs a control signal to close the frequency control circuit, the ETH filter circuit is prevented from outputting outwards, and ETH is avoidedThe filter circuit is damaged due to overload; when the feedback detection circuit detects that the voltage drop of the circuit is larger than the maximum value of the set threshold range A and smaller than the set maximum working voltage V MAX V at the time of MAX The feedback detection circuit outputs a control signal to adjust the working frequency f of the frequency control circuit to be 1/2 of the highest working frequency, f CLK 2, the ETH filter circuit is in a half-speed working mode, so that the Ethernet transmission speed of the ETH circuit and the load end can reach 1/2 of the maximum transmission speed when the broadband is 100M, the driving capability of the ETH filter circuit is reduced, and the working stability of the circuit is improved; when the feedback detection circuit detects the voltage drop generated on the load end resistor, the voltage drop is larger than the set maximum working voltage V MAX When the ETH filter circuit is in an overvoltage working state, the feedback detection circuit outputs a control signal to forcibly close the frequency control circuit, the ETH filter circuit is forbidden to output outwards, and the ETH filter circuit is prevented from being damaged due to overvoltage.
As shown in fig. 3, the feedback detection circuit in this embodiment is mainly composed of a voltage detection unit circuit, in which the a terminal of the voltage detection unit circuit is connected to an ETH signal line, voltage detection is performed on signals through a resistor network, voltages detected by resistors Rc and Rb are compared with voltages at the Vref terminal, and when the detected voltages fall within a set range, a control signal is output at the b terminal to control the frequency control circuit, specifically implemented as follows: voltage of Vref V MIN (200 mV), 225mV,275mV and V MAX (500 mV) when the voltage detected by the resistors Rc and Rb is less than V MIN When (200 mV), the b end outputs a low-level signal, the frequency control circuit is forbidden to work, and the ETH circuit does not output; when the voltages detected by the resistors Rc and Rb are 200mV,225mV]When the circuit is in a low-speed working mode, the working frequency of the circuit is reduced to 1/4 of the highest working frequency, and f CLK 4; when the voltages detected by the resistors Rc and Rb are 225mV,275mV]When the frequency of the square wave signal is 1KHz, the square wave signal is output from the end b, the frequency control circuit is controlled to be in a normal working mode, and the working frequency of the circuit is the highest working frequency f CLK The method comprises the steps of carrying out a first treatment on the surface of the When the voltages detected by the resistors Rc and Rb are at [275mV,500mV]When the frequency of the triangular wave signal is 1KHz, the b end outputs the triangular wave signal, and the control is performedThe frequency control circuit is in a half-speed working mode, the working frequency of the circuit is reduced to 1/2 of the highest working frequency, f CLK 2; when the voltage detected by the resistors Rc and Rb is greater than V MAX And (500 mV) outputting a low-level signal at the end b, prohibiting the frequency control circuit from working, and enabling the ETH circuit not to output.
The frequency control circuit is mainly composed of a digital circuit CPLD or FPGA, and realizes frequency control through internal programmable logic control, as shown in figure 4, when CLK is low level, the output of the frequency control circuit is forbidden, at the moment, the ETH signal and the ETH1 signal are disconnected, and no signal is output from the frequency control circuit; when clk=1, then the frequency of the ETH1 signal is 1/4 of the frequency of the ETH signal, f CLK 4; when CLK=1KHz square wave, the frequency of the ETH1 signal is equal to the ETH signal frequency, f CLK The method comprises the steps of carrying out a first treatment on the surface of the When clk=1 KHz triangle wave, the frequency of the ETH1 signal is 1/2 of the frequency of the ETH signal, f CLK /2。
The on-vehicle ethernet filter circuit that this embodiment provided can detect the change of the voltage of load end, according to the change condition of load voltage, adjusts the drive capability of circuit, adjusts the operating frequency of circuit, improves the stability of circuit work.
Embodiment two:
referring to fig. 2 and 5, the present embodiment provides a control method of an on-vehicle ethernet filter circuit, which includes that the ETH filter circuit outputs a constant current to the outside, a load terminal generates a voltage, a feedback detection circuit detects that a voltage drop of a line falls within a threshold range, and determines that the load is in normal operation, and the ETH filter circuit is at a highest operating frequency f CLK In this embodiment, a termination resistor of 100deg.C is provided in the load, a constant current source in the ETH filter circuit outputs 2.5mA to the outside constant current, a voltage of 250mV is generated on the load termination resistor, the threshold range A is 225mV-275mV, when the feedback detection circuit detects that the voltage drop of the circuit falls within the set threshold range A, the load is judged to work normally, and the frequency control circuit is at the highest working frequency f CLK And starting a full-speed working mode, so that the Ethernet transmission speed of the ETH circuit and the load end reaches the maximum transmission speed when the bandwidth of 100M is reached.
The feedback detection circuit detects that the voltage drop of the circuit is smaller than the minimum value of the set threshold range A and is larger than the set minimum working voltage V MIN When the ETH filter circuit is in a low-speed working mode, the feedback detection circuit outputs a control signal and adjusts the working frequency f of the frequency control circuit; wherein the minimum operating voltage V MIN The working frequency f of the low-speed working mode is 200mV, and the working frequency f is the highest working frequency f CLK The ETH filter circuit is in a low-speed working mode, so that the Ethernet transmission speed of the ETH circuit and the load end is reduced to 1/4 of the maximum transmission speed when the bandwidth of 100M is reduced, the driving capability of the ETH filter circuit can be improved, and the stability of the circuit can be improved.
The feedback detection circuit detects that the voltage drop of the circuit is smaller than the set minimum working voltage V MIN When the ETH filter circuit is judged to be in an overload state, the feedback detection circuit outputs a control signal, the frequency control circuit is closed, the ETH filter circuit is forbidden to output outwards, and damage of the ETH filter circuit due to overload is avoided.
The feedback detection circuit detects that the voltage drop of the circuit is larger than the maximum value of the set threshold range A and smaller than the set maximum working voltage V MAX At the maximum operating voltage V MAX The feedback detection circuit outputs a control signal for 500mV, the working frequency f of the frequency control circuit is adjusted, the ETH filter circuit is in a half-speed working mode, the Ethernet transmission speed of the ETH circuit and the load end can reach 1/2 of the maximum transmission speed when the bandwidth of 100M, the driving capability of the ETH filter circuit is reduced, and the working stability of the circuit is provided.
The feedback detection circuit detects that the voltage drop generated by the load terminal is larger than the set maximum working voltage V MAX When the ETH filter circuit is judged to be in an overvoltage working state, the feedback detection circuit outputs a control signal, the frequency control circuit is forcibly closed, the ETH filter circuit is forbidden to output outwards, and the ETH filter circuit is prevented from being damaged due to overvoltage.
The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present invention.
Claims (9)
1. The utility model provides a on-vehicle ethernet filter circuit which characterized in that: the system comprises an ETH circuit, an ETH filter circuit, a common mode inductor and a load terminal, wherein the ETH circuit is connected with the ETH filter circuit, the ETH filter circuit is connected with the common mode inductor, and the common mode inductor is connected with the load terminal;
the ETH filter circuit comprises a feedback detection circuit, a frequency control circuit, a first amplifier and a second amplifier which are respectively connected with two ends of the frequency control circuit, wherein the feedback detection circuit is connected with the frequency control circuit and the second amplifier, and the second amplifier is connected with a constant current source;
the frequency control circuit is composed of a digital circuit CPLD or an FPGA, and realizes frequency control through internal programmable logic control;
the ETH filter circuit outputs constant current to the outside, the load terminal generates voltage, the feedback detection circuit detects the voltage drop of the circuit, and the voltage drop of the circuit is the voltage drop of the load terminal.
2. The on-board ethernet filter circuit of claim 1, wherein: the ETH circuit comprises a current source, and a resistor R1 and a resistor R2 which are respectively connected with two ends of the current source.
3. A control method of a vehicle-mounted Ethernet filter circuit using the method of claim 1 is characterized by comprising the steps that the ETH filter circuit outputs constant current outwards, a load terminal generates voltage, a feedback detection circuit detects that the voltage drop of a circuit falls within a threshold range, the load terminal is judged to work normally, and the ETH filter circuit is at the highest working frequency f CLK 。
4. A control method of an on-board ethernet filter circuit according to claim 3, comprising: the feedback detection circuit detects that the voltage drop of the circuit is smaller than the minimum value of the set threshold range and is larger than the set minimum working voltage V MIN When the ETH filter circuit is in a low-speed working mode, the feedback detection circuit outputs a control signal to adjust the working frequency f of the frequency control circuit; the minimum operating voltage V MIN 200mV.
5. The control method of the on-vehicle ethernet filter circuit according to claim 4, wherein: the working frequency f of the low-speed working mode is the highest working frequency f CLK 1/4 of (C).
6. The control method of the on-vehicle ethernet filter circuit according to claim 4, comprising: the feedback detection circuit detects that the voltage drop of the circuit is smaller than the set minimum working voltage V MIN And when the ETH filter circuit is judged to be in an overload state, the feedback detection circuit outputs a control signal to close the frequency control circuit, and the ETH filter circuit is forbidden to output.
7. A control method of an on-board ethernet filter circuit according to claim 3, comprising: the feedback detection circuit detects that the voltage drop of the circuit is larger than the maximum value of the set threshold range and smaller than the set maximum working voltage V MAX When the ETH filter circuit is in a half-speed working mode, the feedback detection circuit outputs a control signal, adjusts the working frequency f of the frequency control circuit, and the maximum working voltage V MAX 500mV.
8. The control method of the in-vehicle ethernet filter circuit according to claim 7, comprising:
the feedback detection circuit detects that the voltage drop generated by the load terminal is larger than the set maximum working voltage V MAX And when the ETH filter circuit is judged to be in an overvoltage working state, the feedback detection circuit outputs a control signal, the frequency control circuit is forcibly turned off, and the ETH filter circuit is forbidden to output outwards.
9. A control method of an on-board ethernet filter circuit according to claim 3, wherein: the threshold range is 225mV-275mV.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811188461.0A CN109543215B (en) | 2018-10-12 | 2018-10-12 | Vehicle-mounted Ethernet filter circuit and control method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811188461.0A CN109543215B (en) | 2018-10-12 | 2018-10-12 | Vehicle-mounted Ethernet filter circuit and control method |
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| CN109543215A CN109543215A (en) | 2019-03-29 |
| CN109543215B true CN109543215B (en) | 2023-04-25 |
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| JP2008054075A (en) * | 2006-08-25 | 2008-03-06 | Renesas Technology Corp | Semiconductor integrated circuit, and magnetic storage device using the same |
| CN101969727A (en) * | 2010-10-30 | 2011-02-09 | 陈金明 | High power LED driving power supply |
| CN202841146U (en) * | 2012-09-18 | 2013-03-27 | 中兴通讯股份有限公司 | Ethernet electromagnetic interference suppression device |
| CN203193957U (en) * | 2013-02-08 | 2013-09-11 | 深圳市虹林辉科技有限公司 | LED constant current power supply |
| CN106487520A (en) * | 2016-11-17 | 2017-03-08 | 延锋伟世通电子科技（上海）有限公司 | A kind of vehicle-mounted ethernet circuit plate |
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2018
- 2018-10-12 CN CN201811188461.0A patent/CN109543215B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008054075A (en) * | 2006-08-25 | 2008-03-06 | Renesas Technology Corp | Semiconductor integrated circuit, and magnetic storage device using the same |
| CN101969727A (en) * | 2010-10-30 | 2011-02-09 | 陈金明 | High power LED driving power supply |
| CN202841146U (en) * | 2012-09-18 | 2013-03-27 | 中兴通讯股份有限公司 | Ethernet electromagnetic interference suppression device |
| CN203193957U (en) * | 2013-02-08 | 2013-09-11 | 深圳市虹林辉科技有限公司 | LED constant current power supply |
| CN106487520A (en) * | 2016-11-17 | 2017-03-08 | 延锋伟世通电子科技（上海）有限公司 | A kind of vehicle-mounted ethernet circuit plate |
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