CN211086428U - Network cable detection circuit - Google Patents
Network cable detection circuit Download PDFInfo
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- CN211086428U CN211086428U CN201921471981.2U CN201921471981U CN211086428U CN 211086428 U CN211086428 U CN 211086428U CN 201921471981 U CN201921471981 U CN 201921471981U CN 211086428 U CN211086428 U CN 211086428U
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Abstract
The utility model discloses a net twine detection circuitry. The circuit includes: the network cable interface, the low-pass filter circuit and the comparison circuit; the input end of the low-pass filter circuit is connected with any pin of the network cable interface, the output end of the low-pass filter circuit is connected with the input end of the comparison circuit, and the low-pass filter circuit is used for generating a direct current signal and inputting the direct current signal into the comparison circuit under the condition of accessing a network cable; and the output end of the comparison circuit outputs a network cable detection signal. According to the technical scheme, the voltage signal of the network cable interface is detected through the circuit element, so that the detection cost and the standby power consumption are reduced.
Description
Technical Field
The embodiment of the utility model provides a relate to circuit technical field, especially, relate to a net twine detection circuitry.
Background
The network cable interface is a general interface applied to switches, notebook computers, home routers, etc., and along with the development of mobile communication technology, the network cable interface is also gradually applied to handheld mobile terminals, etc. When the method is applied, whether a network cable is accessed or not needs to be detected in real time, and network communication is carried out after the network cable is detected to be accessed.
However, in the process of applying the network cable interface, the utility model people find that the prior art has at least the following disadvantages: the existing network cable detection method is to utilize a network chip to carry out real-time communication with a network cable interface to detect whether a network cable is accessed, the detection method utilizing the real-time communication of the network chip has larger standby power consumption and higher cost, and especially when being applied to small-sized equipment such as a handheld mobile terminal, the detection method has larger power consumption and is not beneficial to the energy-saving and stable operation of the handheld mobile terminal.
SUMMERY OF THE UTILITY MODEL
The utility model provides a net twine detection circuitry to detect the voltage signal of net twine interface through circuit element, reduce detection cost and stand-by power consumption.
An embodiment of the present invention provides a method, including:
the network cable interface, the low-pass filter circuit and the comparison circuit;
the input end of the low-pass filter circuit is connected with any pin of the network cable interface, the output end of the low-pass filter circuit is connected with the input end of the comparison circuit, and the low-pass filter circuit is used for generating a direct current signal and inputting the direct current signal into the comparison circuit under the condition of accessing a network cable;
and the output end of the comparison circuit outputs a network cable detection signal.
Further, the low-pass filter circuit includes: a first resistor and a first capacitor;
the first end of the first resistor is connected with any pin of the network cable interface, the second end of the first resistor is respectively connected with the input end of the comparison circuit and the first end of the first capacitor, and the second end of the first capacitor is grounded.
Further, the comparison circuit includes: the circuit comprises a first operational amplifier, a first comparison resistor and a second comparison resistor;
the output end of the low-pass filter circuit is connected with the non-inverting input end of the first operational amplifier, the first end of the first comparison resistor is externally connected with a first power supply, the second end of the first comparison resistor is respectively connected with the first end of the second comparison resistor and the inverting input end of the first operational amplifier, the second end of the second comparison resistor is grounded, and the first comparison resistor and the second comparison resistor provide comparison voltage for the first operational amplifier.
Further, the low-pass filter circuit includes: the second resistor, the second capacitor, the second operational amplifier, the third resistor and the fourth resistor;
the first end of the second resistor is connected with any pin of the network cable interface, the second end of the second resistor is respectively connected with the non-inverting input end of the second operational amplifier and the first end of the second capacitor, the second end of the second capacitor is grounded, the inverting input end of the second operational amplifier is respectively connected with the first end of the third resistor and the first end of the fourth resistor, the second end of the third resistor is grounded, the second end of the fourth resistor is connected with the output end of the second operational amplifier, and the output end of the second operational amplifier is connected with the input end of the comparison circuit.
Further, the comparison circuit includes: the comparator, a third comparison resistor, a fourth comparison resistor and a pull-up resistor;
the non-inverting input end of the comparator is connected with the output end of the low-pass filter circuit, the first end of the third comparison resistor is externally connected with a second power supply, the second end of the third comparison resistor is respectively connected with the first end of the fourth comparison resistor and the inverting input end of the comparator, the second end of the fourth comparison resistor is grounded, and the third comparison resistor and the fourth comparison resistor provide comparison voltage for the comparator;
the output end of the comparator is connected with the first end of the pull-up resistor, and the second end of the pull-up resistor is externally connected with a second power supply.
Further, the network cable interface is a standard socket 45(Registered Jack, RJ 45).
The embodiment of the utility model provides a net twine detection circuitry. The circuit includes: by the technical scheme, a network cable interface, a low-pass filter circuit and a comparison circuit are realized; the input end of the low-pass filter circuit is connected with any pin of the network cable interface, the output end of the low-pass filter circuit is connected with the input end of the comparison circuit, and the low-pass filter circuit is used for generating a direct current signal and inputting the direct current signal into the comparison circuit under the condition of accessing a network cable; and the output end of the comparison circuit outputs a network cable detection signal. According to the technical scheme, the voltage signal of the network cable interface is detected through the circuit element, so that the detection cost and the standby power consumption are reduced.
Drawings
Fig. 1 is a schematic diagram of a network cable detection circuit according to an embodiment of the present invention;
fig. 2 is another schematic diagram of a network cable detection circuit according to an embodiment of the present invention;
fig. 3 is another schematic diagram of a network cable detection circuit according to an embodiment of the present invention;
fig. 4 is another schematic diagram of a network cable detection circuit according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic diagram of a network cable detection circuit provided by an embodiment of the present invention. The embodiment can be applied to the situation that whether the network cable is accessed or not is detected aiming at the network cable interface. As shown in fig. 1, the network cable detection circuit includes: a network cable interface 10, a low-pass filter circuit 20 and a comparison circuit 30; the input end of the low-pass filter circuit 20 is connected to any pin (not shown) of the network cable interface 10, the output end of the low-pass filter circuit 20 is connected to the input end of the comparison circuit 30, and the low-pass filter circuit 20 is used for generating a direct-current signal and inputting the direct-current signal to the comparison circuit 30 when the network cable is connected; the output terminal of the comparison circuit 30 outputs a network line detection signal.
Specifically, the network cable interface 10 refers to an interface between a network card and a network, and the common network cable interface 10 is a standard socket RJ45 used for connecting a twisted pair. The network communication can be performed after the network cable interface 10 is detected to have network cable access. The low-pass filter circuit 20 is capable of passing low-frequency components in the circuit based on the characteristics of high-frequency-pass capacitance and low-frequency-pass inductance and high-frequency-pass inductance, and blocking and filtering high-frequency signals exceeding a set cut-off frequency. By connecting the low pass filter circuit 20 to any pin of the network cable interface 10, when a network cable is connected to the network cable interface 10, a dc voltage signal is generated, the dc voltage signal is input to the comparison circuit 30 through the low pass filter circuit 20, and the comparison circuit 30 is configured to compare the dc voltage signal with a set comparison voltage, so as to output a comparison result, i.e., a network cable detection signal, and further determine whether the network cable is connected. The comparison circuit 30 may be implemented by an operational amplifier or a comparator.
According to the network cable detection circuit provided by the embodiment, the low-frequency direct-current voltage signal generated when the network cable is accessed is detected by using the low-pass filter circuit and the comparison circuit, a network chip and real-time communication between the network chip and a network cable interface are not needed, and the detection can be realized by using simple circuit elements, so that the detection cost and the standby power consumption are reduced.
On the basis of the above embodiment, fig. 2 is another schematic diagram of a network cable detection circuit provided by the embodiment of the present invention. As shown in fig. 2, the low-pass filter circuit 20 includes: a first resistor R1 and a first capacitor C1; a first end of the first resistor R1 is connected to any pin of the network cable interface 10, a second end of the first resistor R1 is connected to the input terminal of the comparator circuit 30 and the first end of the first capacitor C1, respectively, and a second end of the first capacitor C1 is grounded.
Specifically, the low-pass filter circuit 20 in this embodiment is composed of a first resistor R1 and a first capacitor C1, and is a passive low-pass filter. The network cable interface 10 is a standard socket RJ45, the RJ45 has 8 pins, and the first end of the first resistor R1 is connected to any pin of the RJ 45. When a network cable is connected, the low pass filter circuit 20 generates a dc voltage signal, and the second terminal of the first capacitor C1 is grounded to filter out high frequency components and low frequency dc voltage and input to the comparator circuit 30. In this case, since the dc voltage generated by the network access is higher than the set comparison voltage, the comparison circuit 30 outputs a high level, and the network access can be detected. Optionally, the cut-off frequency of the low-pass filter circuit 20 is set to be less than 30Khz to ensure low power consumption.
Further, the comparison circuit 30 includes: a first operational amplifier U1A, a first comparison resistor R10, and a second comparison resistor R20; the output end of the low-pass filter circuit 20 is connected to the non-inverting input end of the first operational amplifier U1A, the first end of the first comparison resistor R10 is externally connected to the first power VCC1, the second end of the first comparison resistor R10 is connected to the first end of the second comparison resistor R20 and the inverting input end of the first operational amplifier U1A, the second end of the second comparison resistor R20 is grounded, and the first comparison resistor R10 and the second comparison resistor R20 provide comparison voltage for the first operational amplifier U1A.
Specifically, in the case of no network cable access, the non-inverting input terminal of the first operational amplifier U1A has no voltage input, and the inverting input terminal has a comparison voltage (the comparison voltage is provided by the first power VCC1, the first comparison resistor R10, and the second comparison resistor R20, and is denoted as Vref), then the comparison result of the first operational amplifier U1A is output low; under the condition that the network cable is connected, the alternating current signal connected to the network cable generates a direct current voltage signal (denoted as VIN) through the low-pass filter circuit 20 and is input to the non-inverting input terminal of the first operational amplifier U1A, and the comparison result of the first operational amplifier U1A can be output at a high level only by setting Vref at the inverting input terminal to be smaller than VIN. The network cable detection can be realized by detecting whether the output of the comparison circuit 30 is at a high level or a low level.
On the basis of the above embodiment, fig. 3 is another schematic diagram of a network cable detection circuit provided by the embodiment of the present invention. As shown in fig. 3, the low-pass filter circuit 20 includes: a second resistor R2, a second capacitor C2, a second operational amplifier U2A, a third resistor R3 and a fourth resistor R4; a first end of the second resistor R2 is connected to any pin of the network cable interface 10, a second end of the second resistor R2 is connected to a non-inverting input terminal of the second operational amplifier U2A and a first end of the second capacitor C2, a second end of the second capacitor C2 is grounded, an inverting input terminal of the second operational amplifier U2A is connected to a first end of the third resistor R3 and a first end of the fourth resistor R4, a second end of the third resistor R3 is grounded, a second end of the fourth resistor R4 is connected to an output terminal of the second operational amplifier U2A, and an output terminal of the second operational amplifier U632 2A is connected to an input terminal of the comparison circuit 30.
Specifically, in the present embodiment, the low-pass filter circuit 20 is a first-order active low-pass filter circuit. The first end of the second resistor R2 is an input end of an ac signal generated when the network cable is connected, the ac signal generates a dc voltage signal through the low pass filter circuit 20 and is input to the comparator circuit 30, and the comparator circuit 30 compares the dc voltage signal with a comparison voltage.
Further, the comparison circuit 30 includes: a comparator U3A, a third comparison resistor R30, a fourth comparison resistor R40 and a pull-up resistor R50; the non-inverting input end of the comparator U3A is connected with the output end of the low-pass filter circuit 20, the first end of the third comparison resistor R30 is externally connected with a second power supply VCC2, the second end of the third comparison resistor R30 is respectively connected with the first end of the fourth comparison resistor R40 and the inverting input end of the comparator U3A, the second end of the fourth comparison resistor R40 is grounded, and the third comparison resistor R30 and the fourth comparison resistor R40 provide comparison voltage for the comparator U3A; the output end of the comparator U3A is connected with the first end of a pull-up resistor R50, and the second end of the pull-up resistor R50 is externally connected with a second power supply VCC 2.
Specifically, when the network cable is not connected, the non-inverting input terminal of the comparator U3A has no voltage input, and the inverting input terminal of the comparator U3A has a comparison voltage (the comparison voltage is provided by the second power supply VCC2, the third comparison resistor R30, and the fourth comparison resistor R40, and is recorded as Vref1), then the comparison result of the comparator U3A is output low level; when a network cable is connected, an ac signal connected to the network cable generates a dc voltage signal (denoted as VIN1) through the low-pass filter circuit 20 and is input to the non-inverting input terminal of the comparator U3A, and the comparison result of the comparator U3A can be output at a high level by setting Vref1 at the inverting input terminal of the comparator U3A to be smaller than VIN 1. The network cable detection can be realized by detecting whether the output of the comparison circuit 30 is at a high level or a low level.
Further, the network cable interface 10 is a standard socket RJ 45.
On the basis of the above embodiment, fig. 4 is another schematic diagram of a network cable detection circuit provided by the embodiment of the present invention. As shown in fig. 4, the low-pass filter circuit 20 includes: a fifth resistor R5, a sixth resistor R6, a third capacitor C3, a fourth capacitor C4, a seventh resistor R7, an eighth resistor R8 and a fourth operational amplifier U4A; a first end of a fifth resistor R5 is connected to any pin of the network cable interface 10, a second end of the fifth resistor R5 is connected to a first end of a third capacitor C3 and a first end of a sixth resistor R6, a second end of the third capacitor C3 is grounded, a second end of the sixth resistor R6 is connected to a first end of a fourth capacitor C4 and a non-inverting input terminal of a fourth operational amplifier U4A, a second end of the fourth capacitor C4 is grounded, an inverting input terminal of the fourth operational amplifier U4A is connected to a first end of a seventh resistor R7 and a first end of an eighth resistor R8, a second end of the seventh resistor R7 is grounded, a second end of the eighth resistor R8 is connected to an output terminal of a fourth operational amplifier U4A, and an output terminal of the fourth operational amplifier U4A is connected to an input terminal of the comparator circuit 30. The fifth low-pass filter circuit 20 is a second-order active low-pass filter.
Further, the comparison circuit 30 includes: a fifth comparison resistor R50, a sixth comparison resistor R60, and a fifth operational amplifier U5A, wherein a first end of the fifth comparison resistor R50 is connected to the third power VCC3, a second end of the fifth comparison resistor R50 is respectively connected to a first end of the sixth comparison resistor R60 and an inverting input end of the fifth operational amplifier U5A, a second end of the sixth comparison resistor R60 is grounded, a non-inverting input end of the fifth operational amplifier U5A is connected to an output end of the low-pass filter circuit 20, and the comparison circuit 30 implements a network cable detection function through the operational amplifier.
The low-pass filter circuit 20 and the comparator circuit 30 may have other forms. For example, the low-pass filter circuit 20 may be a passive or active filter circuit, a first-order or second-order filter circuit, or the like, and may have a low-pass filtering function; the comparison circuit 30 may be implemented by using an operational amplifier or a comparator U3A, and is configured to compare a dc voltage signal generated after the network cable is connected with a comparison voltage, and output a high level or a low level to implement network cable detection. When the comparison circuit 30 is implemented by using a comparator, a pull-up resistor needs to be connected to the output terminal of the comparator. In addition, different low-pass filter circuits 20 and comparison circuits 30 may be used in combination.
In the embodiment, by adding hardware circuit elements, the direct-current voltage signals generated when the network cable is accessed are detected and compared, so that the network cable detection is realized, a network chip is not required to be utilized, real-time communication is not required, the network cable detection function can be realized through a pure hardware circuit, and the requirement that the energy authentication standby power consumption is less than 0.5W can be met.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (6)
1. A network cable detection circuit, comprising: the network cable interface, the low-pass filter circuit and the comparison circuit;
the input end of the low-pass filter circuit is connected with any pin of the network cable interface, the output end of the low-pass filter circuit is connected with the input end of the comparison circuit, and the low-pass filter circuit is used for generating a direct current signal and inputting the direct current signal into the comparison circuit under the condition of accessing a network cable;
and the output end of the comparison circuit outputs a network cable detection signal.
2. The circuit of claim 1, wherein the low pass filter circuit comprises: a first resistor and a first capacitor;
the first end of the first resistor is connected with any pin of the network cable interface, the second end of the first resistor is respectively connected with the input end of the comparison circuit and the first end of the first capacitor, and the second end of the first capacitor is grounded.
3. The circuit of claim 1, wherein the comparison circuit comprises: the circuit comprises a first operational amplifier, a first comparison resistor and a second comparison resistor;
the output end of the low-pass filter circuit is connected with the non-inverting input end of the first operational amplifier, the first end of the first comparison resistor is externally connected with a first power supply, the second end of the first comparison resistor is respectively connected with the first end of the second comparison resistor and the inverting input end of the first operational amplifier, the second end of the second comparison resistor is grounded, and the first comparison resistor and the second comparison resistor provide comparison voltage for the first operational amplifier.
4. The circuit of claim 1, wherein the low pass filter circuit comprises: the second resistor, the second capacitor, the second operational amplifier, the third resistor and the fourth resistor;
the first end of the second resistor is connected with any pin of the network cable interface, the second end of the second resistor is respectively connected with the non-inverting input end of the second operational amplifier and the first end of the second capacitor, the second end of the second capacitor is grounded, the inverting input end of the second operational amplifier is respectively connected with the first end of the third resistor and the first end of the fourth resistor, the second end of the third resistor is grounded, the second end of the fourth resistor is connected with the output end of the second operational amplifier, and the output end of the second operational amplifier is connected with the input end of the comparison circuit.
5. The circuit of claim 1, wherein the comparison circuit comprises: the comparator, a third comparison resistor, a fourth comparison resistor and a pull-up resistor;
the non-inverting input end of the comparator is connected with the output end of the low-pass filter circuit, the first end of the third comparison resistor is externally connected with a second power supply, the second end of the third comparison resistor is respectively connected with the first end of the fourth comparison resistor and the inverting input end of the comparator, the second end of the fourth comparison resistor is grounded, and the third comparison resistor and the fourth comparison resistor provide comparison voltage for the comparator;
the output end of the comparator is connected with the first end of the pull-up resistor, and the second end of the pull-up resistor is externally connected with a second power supply.
6. The circuit of any one of claims 1 to 5, wherein the network cable interface is a standard jack RJ 45.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921471981.2U CN211086428U (en) | 2019-09-05 | 2019-09-05 | Network cable detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921471981.2U CN211086428U (en) | 2019-09-05 | 2019-09-05 | Network cable detection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN211086428U true CN211086428U (en) | 2020-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921471981.2U Active CN211086428U (en) | 2019-09-05 | 2019-09-05 | Network cable detection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113764924A (en) * | 2021-07-28 | 2021-12-07 | 苏州浪潮智能科技有限公司 | Network cable type discrimination network port |
-
2019
- 2019-09-05 CN CN201921471981.2U patent/CN211086428U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113764924A (en) * | 2021-07-28 | 2021-12-07 | 苏州浪潮智能科技有限公司 | Network cable type discrimination network port |
| CN113764924B (en) * | 2021-07-28 | 2023-07-21 | 苏州浪潮智能科技有限公司 | Network cable type screening network port |
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