CN114124155A - Communication network load detection circuit - Google Patents
Communication network load detection circuit Download PDFInfo
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- CN114124155A CN114124155A CN202111321133.5A CN202111321133A CN114124155A CN 114124155 A CN114124155 A CN 114124155A CN 202111321133 A CN202111321133 A CN 202111321133A CN 114124155 A CN114124155 A CN 114124155A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/544—Setting up communications; Call and signalling arrangements
Abstract
The application discloses communication network load detection circuit is applied to power line carrier communication network, and the circuit includes: the first end of the current sampling unit is connected with the grounding end of a first operational amplifier in the power carrier communication network, the second end of the current sampling unit is connected with the grounding end of a second operational amplifier in the power carrier communication network and used for collecting the output current of the signal amplification circuit, and the output current of the signal amplification circuit is positively correlated with the communication load generated by the power carrier communication in the power grid; the current conversion unit is connected with the second end of the current sampling unit and used for converting the output current of the signal amplification circuit into a first voltage signal; and the first display unit is connected with the current conversion unit and used for acquiring the output current of the signal amplification circuit according to the first voltage signal and displaying the output current of the signal amplification circuit. The application detects the size of the communication load.
Description
Technical Field
The invention relates to the technical field of power line carrier communication, in particular to a communication network load detection circuit.
Background
Advanced Metering Infrastructure (AMI) is an important component of intelligent network planning, wherein a networked meter reading technology can be realized by a Power Line Carrier (PLC) technology, and a signal output by an intelligent electric meter is transmitted through a power line in a power grid by the power line carrier technology. Fig. 1 shows a circuit diagram of a power line carrier communication module, where the power line carrier technology is based on an OFDM modulation mode, a digital signal to be transmitted is modulated into a differential analog signal by a modulation circuit a1 in a transmission process of a power line carrier signal, the differential analog signal is amplified by a signal amplification circuit a2, and the amplified signal is coupled to any two power lines with a voltage difference by a coupling circuit A3 for signal transmission. Accordingly, the reception of the power line carrier signal is the reverse of the transmission.
However, when the power line carrier technology is used for communication in the power grid, a communication load is generated, which affects the transmission power and the receiving sensitivity of a communication signal, resulting in a reduction in communication quality. Because the communication load is related to the type of the user power load and the power consumption, the communication load condition is detected, and then a proper PLC communication frequency band and the installation position of the intelligent electric meter are selected or a filter is added, so that the construction and communication success rate of a power line carrier communication network can be improved, and a more stable and convenient intelligent electric meter communication system is provided for the user.
Therefore, a communication network load detection circuit is needed.
Disclosure of Invention
In order to solve the above technical problem, the present invention provides a communication network load detection circuit, which detects a communication load generated in a power grid by power carrier communication.
According to an aspect of the embodiments of the present application, there is provided a communication network load detection circuit applied to a power carrier communication network, in which a signal amplification circuit includes a first operational amplifier for amplifying a forward PLC signal and a second operational amplifier for amplifying a reverse PLC signal; the communication network load detection circuit comprises:
the first end of the current sampling unit is connected with the grounding end of the first operational amplifier, the second end of the current sampling unit is connected with the grounding end of the second operational amplifier and used for collecting the output current of the signal amplification circuit, and the output current of the signal amplification circuit is positively correlated with the communication load generated in the power grid by power carrier communication;
the current conversion unit is connected with the second end of the current sampling unit and used for converting the output current of the signal amplification circuit into a first voltage signal;
and the first display unit is connected with the current conversion unit and used for acquiring the output current of the signal amplification circuit according to the first voltage signal and displaying the output current of the signal amplification circuit.
In some embodiments of the present application, based on the above scheme, the current sampling unit includes:
and a first end of the first resistor is connected with the grounding end of the first operational amplifier, and a second end of the first resistor is connected with the grounding end of the second operational amplifier.
In some embodiments of the present application, based on the above scheme, the current converting unit includes:
a first end of the second resistor is connected with a second end of the current sampling unit;
the third operational amplifier comprises a positive phase input end, an inverse phase input end and an output end, wherein the positive phase input end is connected with the second end of the second resistor;
a first end of the third resistor is grounded, and a second end of the third resistor is connected with an inverting input end of the third operational amplifier;
and the fourth resistor is connected across the output end and the inverting input end of the third operational amplifier.
In some embodiments of the present application, based on the above scheme, the relationship between the first voltage signal and the output current of the signal amplifying circuit is
Iout＝Cout R3/(R3+R4)R1
Wherein Iout represents an output current of the amplifying circuit, Cout represents the first voltage signal, R1 represents the first resistor, R3 represents the third resistor, and R4 represents the fourth resistor.
In some embodiments of the present application, based on the above scheme, the first display unit includes:
the analog-to-digital conversion module is connected with the current conversion unit and used for performing analog-to-digital conversion on the first voltage signal;
the data processing module is connected with the analog-to-digital conversion module and used for acquiring output current after analog-to-digital conversion according to the first voltage signal after analog-to-digital conversion;
and the display module is connected with the data processing module and used for displaying the waveform of the output current after the analog-to-digital conversion on a display screen.
In some embodiments of the present application, based on the above scheme, the circuit further includes:
and the second display unit comprises a plurality of groups of indicator light units and is used for controlling the plurality of groups of indicator light units to light according to the first voltage signal.
In some embodiments of the present application, based on the above scheme, the indicator light unit includes:
the reference voltage generating module is used for generating reference voltage according to the maximum value of the first voltage signal when the communication load is a preset communication load;
a comparison module, including a first positive input terminal, a first negative input terminal, and a first comparison result output terminal, where the first positive input terminal is connected to the output terminal of the reference voltage generation module, and the first negative input terminal is connected to the output terminal of the current conversion unit, and is used to compare the reference voltage with the first voltage and output a second voltage;
and the light emitting module is connected with the first comparison result output end of the comparison module and is used for emitting light under the driving of the second voltage.
In some embodiments of the present application, based on the above scheme, the reference voltage generating module includes:
a first end of the seventh resistor is connected with a power supply;
and a first end of the eighth resistor is connected with a second end of the seventh resistor, and a second end of the eighth resistor is grounded.
In some embodiments of the present application, based on the above scheme, the comparing module includes:
a first end of the sixth resistor is connected with the output end of the current conversion unit;
the voltage comparator comprises a second positive input end, a second negative input end and a second comparison result output end, the second positive input end is connected with the second end of the sixth resistor, and the second negative input end is connected with the output end of the reference voltage generation module;
and a first end of the ninth resistor is connected with the second comparison result output end of the voltage comparator, and a second end of the ninth resistor is connected with the light-emitting module.
In some embodiments of the present application, based on the above scheme, the light emitting module includes:
the anode of the light-emitting diode is connected with a power supply;
and the control end of the switch tube is connected with the first comparison result output end of the comparison module, the input end of the switch tube is connected with the cathode of the light-emitting diode, and the output end of the switch tube is grounded.
According to the power carrier communication load display method and device, the output current of the amplifying circuit in the power carrier communication is collected through the first sampling unit, and the output current is displayed through the first display unit, so that the size of a load generated in the power grid by the power carrier communication is visually judged.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure. It is to be understood that the drawings in the following description are merely exemplary of the disclosure, and that other drawings may be derived from those drawings by one of ordinary skill in the art without the exercise of inventive faculty.
Fig. 1 shows a circuit diagram of a power line carrier communication module.
Fig. 2 shows a schematic diagram of a load in a power carrier communication network.
Fig. 3 is a schematic diagram illustrating a communication network load detection circuit according to an embodiment.
Fig. 4 is a schematic diagram illustrating another communication network load detection circuit according to an embodiment.
Fig. 5 is a schematic diagram illustrating yet another communication network load detection circuit according to an embodiment.
Fig. 6 is a schematic diagram illustrating a first display unit according to an embodiment.
Fig. 7 is a schematic diagram illustrating an indicator light unit according to an embodiment.
Fig. 8 is a schematic diagram illustrating another indicator light unit in accordance with one embodiment.
Detailed Description
Exemplary embodiments that embody features and advantages of the invention are described in detail below in the specification. It is to be understood that the invention is capable of other embodiments and that various changes in form and details may be made therein without departing from the scope of the invention and the description and drawings are to be regarded as illustrative in nature and not as restrictive.
In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. Either mechanically or electrically. Either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present embodiment can be understood by those of ordinary skill in the art according to specific situations.
Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.
Fig. 2 shows a schematic diagram of a load in a power carrier communication network. As shown in fig. 2, when the signal amplification circuit in the power carrier signal transmitting end couples the amplified signal to the power line, an output impedance a4 and an output load a5 (i.e., a communication load) are introduced, and when the output power and the output impedance of the signal amplification circuit are constant, the larger the output load a5 is, the larger the required driving current is, and the voltage of the output PLC signal is reduced. That is, the amplitude of the PLC signal is reduced, which causes the PLC signal to be submerged in noise, affecting the communication distance.
Similarly, the receiving impedance a7 and the receiving load a6 (i.e., the communication load) are introduced into the receiving end of the power carrier signal. Theoretically, the larger the receiving impedance A7 is, the more complete the received PLC signal is, but due to the existence of the receiving load A6 and the parallel connection of the receiving load A6 and the receiving impedance A7, the receiving impedance A6// A7 (equivalent impedance after the A6 is connected with the A7 in parallel) becomes smaller, and the amplitude of the received signal is reduced. It should be noted that the output load a5 generated at the transmitting end of the power carrier signal is measured here.
Fig. 3 is a schematic diagram illustrating a communication network load detection circuit according to an embodiment. The detection circuit is applied to a power carrier communication network and used for detecting a load generated in a power grid by a power carrier communication technology, and the load is hereinafter referred to as a communication load. As shown in fig. 3, the signal amplifying circuit a2 in the power carrier communication network includes a first operational amplifier PA1 for amplifying the forward PLC signal and a second operational amplifier PA2 for amplifying the reverse PLC signal. The communication network load detection circuit includes:
the first end of the current sampling unit 310 is connected to the ground terminal of the first operational amplifier PA1, the second end of the current sampling unit 310 is connected to the ground terminal of the second operational amplifier PA2, and the current sampling unit 310 is configured to collect an output current of the signal amplification circuit, and the output current of the signal amplification circuit a2 is positively correlated to a communication load a10 (corresponding to a5 in fig. 2) generated in the power grid by power carrier communication.
Note that the first terminal of the current sampling unit 310 is grounded.
As shown in fig. 3, the ground terminals of the first operational amplifier PA1 and the second operational amplifier PA2 are connected through the current sampling unit, and form a loop with the coupling circuit T1, and the output current of the signal amplifying circuit a2 is generated in the loop due to the communication load a 10.
In the loop, the current flowing through the current sampling unit is the output current of the signal amplifying circuit a2, and as analyzed in fig. 2, the larger the output load a5 is, the larger the required driving current is, so that the output current of the signal amplifying circuit a2 is positively correlated with the communication load a10, and the magnitude of the communication load a10 can be equivalent to the output current of the amplifying circuit a 2.
And a current converting unit 320 connected to the second end of the current sampling unit 310, for converting the output current of the signal amplifying circuit into a first voltage signal.
In the embodiment of the application, for convenience of subsequent display or application of the current sampling signal, the size of the equivalent communication load is carried out, and the current signal is converted into the voltage signal.
The first display unit 330 is connected to the current converting unit, and configured to obtain an output current of the signal amplifying circuit according to the first voltage signal, and display the output current of the signal amplifying circuit.
Because the output current of the signal amplifying circuit A2 is positively correlated with the communication load A10 generated in the power grid by power carrier communication, the waveform of the current is directly and obviously output, and a worker can directly learn the size of the communication load.
According to the power carrier communication load display method and device, the output current of the amplifying circuit in the power carrier communication is collected through the first sampling unit, and the output current is displayed through the first display unit, so that the size of a load generated in the power grid by the power carrier communication is visually judged.
Fig. 4 is a schematic diagram illustrating another communication network load detection circuit according to an embodiment.
As shown in fig. 4, the current sampling unit 410 includes:
a first end of the first resistor R1 and a first end of the first resistor R1 are connected to the ground terminal of the first operational amplifier PA1, and a second end of the first resistor R1 is connected to the ground terminal of the second operational amplifier PA 2.
The output current of signal amplification circuit A2 is gathered through the form of resistance to this application, and the voltage drop of first resistance R1 can be gathered to the current conversion unit to convert output current into first voltage signal.
In a specific implementation, the first resistor R1 may be a resistor of m Ω or u Ω level. If the resistance of R1 is too large, the voltage drop across R1 will be large, so that the ground of PA2 is connected through R1 and is not a zero potential plane.
Fig. 5 is a schematic diagram illustrating yet another communication network load detection circuit according to an embodiment.
As shown in fig. 5, the current converting unit 520 includes:
a second resistor R2, wherein a first end of the second resistor R2 is connected with a second end of the first resistor R1;
a third operational amplifier U1, including a positive phase input terminal, an inverse phase input terminal and an output terminal, the positive phase input terminal being connected to the second terminal of the second resistor R2;
a third resistor R3, wherein a first end of the third resistor R3 is grounded, and a second end of the third resistor R3 is connected with an inverting input end of the third operational amplifier U1;
and the fourth resistor R4 is connected across the output end and the inverting input end of the third operational amplifier U1.
In the embodiment of the present application, the voltage drop of the first resistor R1 is collected by using the normal-phase amplifying circuit, and circuit analysis of fig. 5 shows that the relationship between the first voltage signal and the output current of the signal amplifying circuit a2 is:
wherein Iout represents the output current of the amplifier circuit, Cout represents the first voltage signal, R1 represents the first resistor, R3 represents the third resistor, and R4 represents the fourth resistor. Adjusting R3 and R4 can adjust the Cout maximum and minimum values.
Since the PLC signal is a signal of an OFDM modulation scheme, the waveform of Iout is also an OFDM waveform, and in a specific implementation, in order to detect more accurately, U1 may select a high-speed operational amplifier, and the response speed is at least 2M.
Fig. 6 is a schematic diagram illustrating a first display unit according to an embodiment. As shown in fig. 6, the first display unit includes:
the analog-to-digital conversion module 610 is connected with the current conversion unit and is used for performing analog-to-digital conversion on the first voltage signal;
the data processing module 620 is connected to the analog-to-digital conversion module 610, and is configured to obtain an output current after analog-to-digital conversion according to the first voltage signal after analog-to-digital conversion;
and the display module 630 is connected with the data processing module 630 and is used for displaying the waveform of the output current after the analog-to-digital conversion on a display screen.
In one embodiment, the analog-to-digital conversion module 610 samples the first voltage signal and adjusts the third resistor R3 and the fourth resistor R4 to ensure that the maximum value and the minimum value of Cout generation are within the input range of the analog-to-digital conversion module. The data processing module 620 may adopt an MCU, and the analog-to-digital conversion module 610 outputs an SPI signal to the MCU, and the MCU calculates Iout by using the relationship between Iout and Cout. The display module 630 may employ a liquid crystal display panel so as to display Iout through the liquid crystal display panel.
In some embodiments of the present application, based on the above scheme, the circuit may further include:
and the second display unit comprises a plurality of groups of indicator light units and is used for controlling the plurality of groups of indicator light units to light according to the first voltage signal.
Fig. 7 is a schematic diagram illustrating an indicator light unit according to an embodiment. As shown in fig. 7, the indicator lamp unit includes:
the reference voltage generating module 710 is configured to generate a reference voltage according to a maximum value of the first voltage signal when the communication load is a preset communication load.
Assuming that the maximum value of Cout is V _2 when the communication load is 2 Ω, the reference voltage generated by the reference voltage generating module 710 is Vref-V _2, and similarly, the Vref values corresponding to the multiple indicator light units are obtained by recording the maximum values of Cout under other communication load resistance values, for example, when the communication load is 5 Ω, the maximum value of Cout is V _5, the reference voltage generated by the reference voltage generating module 710 is Vref-V _5, and when the communication load is 10 Ω, the maximum value of Cout is V _10, the reference voltage generated by the reference voltage generating module 710 is Vref-V _ 10.
The comparing module 720 includes a first positive input terminal connected to the output terminal of the reference voltage generating module 710, a first negative input terminal connected to the output terminal of the current converting unit for comparing the reference voltage with the first voltage and outputting a second voltage, and a first comparison result output terminal.
And a light emitting module 730 connected to the first comparison result output terminal of the comparison module 720, and configured to emit light under the driving of the second voltage.
The comparison module 720 may output a high level to drive the light emitting module to light when the first voltage is greater than the reference voltage, and output a low level to turn off the light emitting module when the first voltage is greater than the reference voltage.
In specific implementation, a plurality of groups of indicator light units can be arranged, and each group of indicator light units is compared with communication loads with different resistance values. When the first voltage is greater than the reference voltage corresponding to the indicator light unit, the light emitting module corresponding to the indicator light unit is lightened.
For example, when only the first lighting module is lit, it means that when Cout reaches V _2, the communication load is 2 Ω. When the first light emitting module, the second light emitting module and the third light emitting module are lighted together, it indicates that Cout reaches V _10, and the communication load is 10 Ω.
Fig. 8 is a schematic diagram illustrating another indicator light unit in accordance with one embodiment. As shown in fig. 8, the reference voltage generating module 810 includes:
a seventh resistor R7, a first end of the seventh resistor R7 being connected to the power supply;
and a first end of the eighth resistor R8, a first end of the eighth resistor R8 and a second end of the seventh resistor R7 are connected, and a second end of the eighth resistor R8 is grounded.
In an implementation, the R7 and the R8 are adjusted to generate the reference voltage first voltage signal corresponding to the maximum value of the communication load when the communication load is a preset communication load.
As shown in fig. 8, the comparison module 820 includes:
a sixth resistor R6, wherein a first end of the sixth resistor R6 is connected with the output end of the current conversion unit;
the voltage comparator U2 includes a second positive input terminal, a second negative input terminal, and a second comparison result output terminal, the second positive input terminal is connected to the second terminal of the sixth resistor R6, and the second negative input terminal is connected to the output terminal of the reference voltage generating module 810;
a first end of the ninth resistor R9, a ninth resistor R9 is connected to the second comparison result output terminal of the voltage comparator U2, and a second end of the ninth resistor R9 is connected to the light emitting module 830.
In a specific implementation, the comparing module 820 further includes a first capacitor C1, one end of which is connected to the second negative input terminal of the voltage comparator U2, and the other end of which is grounded for filtering.
As shown in fig. 8, the light emitting module 830 includes:
the anode of the light-emitting diode D1 is connected with a power supply;
the control end of the switch tube Q1 and the control end of the switch tube Q1 are connected with the first comparison result output end of the comparison module 820, the input end of the switch tube Q1 is connected with the cathode of the light-emitting diode D1, and the output end of the switch tube Q1 is grounded.
In a specific implementation, the switching transistor Q1 may be a current-controlled transistor or a voltage-controlled MOS transistor. Fig. 8 illustrates a switching transistor Q1 by using a current-controlled transistor as an example.
When the comparing module 820 outputs a high level, the switching tube Q1 is driven to be turned on, and the light emitting diode D1 is turned on.
In a specific implementation, the light emitting module 830 further includes:
and the tenth resistor R10 is connected in series between the power supply and the light-emitting diode D1 and used for regulating current.
And the second capacitor C2 is connected with the light-emitting diode D1 in parallel and used for filtering.
One end of the eleventh resistor R11 is connected with the output end of the switching tube Q1, and the other end is grounded and used for regulating current.
And the third capacitor C3 is connected with the eleventh resistor R11 in parallel and used for filtering.
The embodiment of the application collects the output current of the amplifying circuit in the electronic carrier communication network, and displays the size of the communication load in a waveform display and/or indicating lamp mode, so that a worker can visually know the size of the communication load and provide reference information for selecting a proper PLC communication frequency band and an intelligent electric meter installation position.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A communication network load detection circuit is applied to a power carrier communication network, wherein a signal amplification circuit in the power carrier communication network comprises a first operational amplifier for amplifying a forward PLC signal and a second operational amplifier for amplifying a reverse PLC signal; the communication network load detection circuit comprises:
the first end of the current sampling unit is connected with the grounding end of the first operational amplifier, the second end of the current sampling unit is connected with the grounding end of the second operational amplifier and used for collecting the output current of the signal amplification circuit, and the output current of the signal amplification circuit is positively correlated with the communication load generated in the power grid by power carrier communication;
the current conversion unit is connected with the second end of the current sampling unit and used for converting the output current of the signal amplification circuit into a first voltage signal;
and the first display unit is connected with the current conversion unit and used for acquiring the output current of the signal amplification circuit according to the first voltage signal and displaying the output current of the signal amplification circuit.
2. The communication network load detection circuit of claim 1, wherein the current sampling unit comprises:
and a first end of the first resistor is connected with the grounding end of the first operational amplifier, and a second end of the first resistor is connected with the grounding end of the second operational amplifier.
3. The communication network load detection circuit of claim 2, wherein the current conversion unit comprises:
a first end of the second resistor is connected with a second end of the current sampling unit;
the third operational amplifier comprises a positive phase input end, an inverse phase input end and an output end, wherein the positive phase input end is connected with the second end of the second resistor;
a first end of the third resistor is grounded, and a second end of the third resistor is connected with an inverting input end of the third operational amplifier;
and the fourth resistor is connected across the output end and the inverting input end of the third operational amplifier.
4. The communication load detection circuit of claim 3, wherein the first voltage signal is related to the output current of the signal amplification circuit by
Wherein Iout represents an output current of the amplifying circuit, Cout represents the first voltage signal, R1 represents the first resistor, R3 represents the third resistor, and R4 represents the fourth resistor.
5. The communication network load detection circuit of claim 1, wherein the first display unit comprises:
the analog-to-digital conversion module is connected with the current conversion unit and used for performing analog-to-digital conversion on the first voltage signal;
the data processing module is connected with the analog-to-digital conversion module and used for acquiring output current after analog-to-digital conversion according to the first voltage signal after analog-to-digital conversion;
and the display module is connected with the data processing module and used for displaying the waveform of the output current after the analog-to-digital conversion on a display screen.
6. The communication network load detection circuit of claim 1, wherein the circuit further comprises:
and the second display unit comprises a plurality of groups of indicator light units and is used for controlling the plurality of groups of indicator light units to light according to the first voltage signal.
7. The communication network load detection circuit of claim 6, wherein the indicator light unit comprises:
the reference voltage generating module is used for generating reference voltage according to the maximum value of the first voltage signal when the communication load is a preset communication load;
a comparison module, including a first positive input terminal, a first negative input terminal, and a first comparison result output terminal, where the first positive input terminal is connected to the output terminal of the reference voltage generation module, and the first negative input terminal is connected to the output terminal of the current conversion unit, and is used to compare the reference voltage with the first voltage and output a second voltage;
and the light emitting module is connected with the first comparison result output end of the comparison module and is used for emitting light under the driving of the second voltage.
8. The communication network load detection circuit of claim 7, wherein the reference voltage generation module comprises:
a first end of the seventh resistor is connected with a power supply;
and a first end of the eighth resistor is connected with a second end of the seventh resistor, and a second end of the eighth resistor is grounded.
9. The communication network load detection circuit of claim 7, wherein the comparison module comprises:
a first end of the sixth resistor is connected with the output end of the current conversion unit;
the voltage comparator comprises a second positive input end, a second negative input end and a second comparison result output end, the second positive input end is connected with the second end of the sixth resistor, and the second negative input end is connected with the output end of the reference voltage generation module;
and a first end of the ninth resistor is connected with the second comparison result output end of the voltage comparator, and a second end of the ninth resistor is connected with the light-emitting module.
10. The communication network load detection circuit of claim 7, wherein the light module comprises:
the anode of the light-emitting diode is connected with a power supply;
and the control end of the switch tube is connected with the first comparison result output end of the comparison module, the input end of the switch tube is connected with the cathode of the light-emitting diode, and the output end of the switch tube is grounded.
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| US20210203284A1 (en) * | 2019-12-31 | 2021-07-01 | Skyworks Solutions, Inc. | Load insensitive power detection |
| CN212932815U (en) * | 2020-08-17 | 2021-04-09 | 漳州立达信光电子科技有限公司 | Load type detection circuit, load type detection device and household equipment |
| CN213240402U (en) * | 2020-10-09 | 2021-05-18 | 深圳莱福德科技股份有限公司 | Load state detection circuit and system |
| CN113252970A (en) * | 2021-04-23 | 2021-08-13 | 长城电源技术有限公司 | Load detection circuit and power supply system |
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