CN219802328U - Power line carrier wave filtering device and detection equipment - Google Patents
Power line carrier wave filtering device and detection equipment Download PDFInfo
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- CN219802328U CN219802328U CN202320961725.1U CN202320961725U CN219802328U CN 219802328 U CN219802328 U CN 219802328U CN 202320961725 U CN202320961725 U CN 202320961725U CN 219802328 U CN219802328 U CN 219802328U
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- 238000001514 detection method Methods 0.000 title claims abstract description 30
- 239000003990 capacitor Substances 0.000 claims abstract description 49
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- 238000004519 manufacturing process Methods 0.000 abstract description 7
- 230000008878 coupling Effects 0.000 abstract description 3
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Abstract
The utility model discloses a power line carrier wave filtering device and detection equipment, the utility model comprises a first filtering module for filtering noise interference in a mains supply, a second filtering module for filtering ripple interference generated by a switching power supply, isolating carrier signals generated in the carrier wave device from flowing out of the mains supply and interfering other carrier wave equipment, a signal transformer for signal coupling, a switching power supply for converting voltage, a plurality of filtering capacitors for filtering low-frequency signals and a controller for receiving and transmitting carrier signals. Compared with the prior art, the utility model utilizes two filters to filter out the carrier interference from the outside and the inside, and isolates the carrier signal generated by the carrier device in the carrier device, thereby solving the problem of complex power line carrier environment in the production test environment.
Description
Technical Field
The utility model relates to the technical field of power filtering equipment, in particular to a power line carrier filtering device and detection equipment.
Background
As smart meters are rapidly popularized in China, the demand of smart meter modules continues to increase, and a communication mode between a communication module and a meter controller in the smart meter module is usually power line carrier communication. However, in the production test process, high-power loads such as a chip mounter and a wave soldering furnace in a factory continuously run, meanwhile, the test devices mutually interfere, the power line carrier environment is easy to be complex, the carrier signal is interfered to work, and carrier communication in the test environment is very unreliable.
Disclosure of Invention
The utility model provides a power line carrier filter device and detection equipment for solving the technical problems of complex power line carrier environment and large interference in the production test process of a carrier communication module in the prior art.
The technical scheme adopted by the utility model is as follows:
there is provided a power line carrier filtering apparatus including:
one side of the switching power supply is carried on the mains supply, and the other side of the switching power supply is connected to the module to be tested and is used for supplying power to the module to be tested;
the detection module is connected with the output side of the module to be detected and is used for detecting the communication capacity of the module to be detected;
the power line carrier filtering device is used for filtering ripple waves generated in the mains supply and the switching power supply through the first filtering module and the second filtering module.
Further, the detection module comprises an attenuator connected to the output side of the module to be detected and used for adjusting the attenuation coefficient, and a shoveling controller connected to the output side of the attenuator and used for receiving and transmitting carrier signals.
Further, the device also comprises a first signal transformer connected between the module to be tested and the attenuator, and a second signal transformer connected between the attenuator and the meter reading controller.
Further, the device further comprises a third filtering module connected between the first signal transformer and the module to be tested, wherein the third filtering module comprises at least one pair of filtering capacitors connected in series between the module to be tested and the first signal transformer.
Further, the device also comprises a fourth filtering module connected between the meter reading controller and the second signal transformer, wherein the fourth filtering module comprises at least one pair of filtering capacitors connected in series between the meter reading controller and the second signal transformer.
Further, the first filtering module and the second filtering module both adopt an EMI filter, a first end of a primary side of the first filtering module is connected to a first input end and a second end of the switching power supply, and a first end of a secondary side of the first filtering module is connected to the power supply input end and the second end of the first filtering module is connected to the mains supply; second input of module
The first end of the primary side of the second filter module is connected between the first output end of the module to be detected and the first input end of the detection module, the second end of the second filter module is connected between the first end of the primary side of the first filter module and the first input end of the switching power supply, the first end of the secondary side of the second filter module is connected between the second output end of the module to be detected and the second input end of the detection module, and the second end of the secondary side of the second filter module is connected between the first end of the secondary side of the first filter module and the second input end of the switching power supply.
Further, two attenuators are arranged, namely a first attenuator and a second attenuator;
the input end of the first attenuator is used as a first input end of the detection module and is connected with a first output end of the module to be detected, and the input end of the second attenuator is used as a second input end of the detection module and is connected with a second output end of the module to be detected;
the first end of the primary side of the first signal transformer is connected to the input end of the second attenuator, the second end of the first signal transformer is connected to the input end of the first attenuator, the first end of the secondary side of the first signal transformer is connected to the first output end of the module to be tested, and the second end of the second signal transformer is connected to the second output end of the module to be tested;
the first end of the primary side of the second signal transformer is connected to the output end of the first attenuator, the second end of the second signal transformer is connected to the second output end of the second attenuator, and the first end of the secondary side of the second signal transformer is connected to the first input end of the meter reading controller, and the second end of the second signal transformer is connected to the second input end of the meter reading controller.
Further, the third filter module comprises a first filter capacitor and a second filter capacitor, the first filter capacitor is connected in series between the second input end of the module to be tested and the second end of the secondary side of the first signal transformer, the second filter capacitor is connected in series between the first input end of the module to be tested and the first end of the secondary side of the first signal transformer, and the first filter capacitor and the second filter capacitor are used as an X capacitor together and used for filtering alternating current lower than 100 Hz.
Further, the fourth filter module comprises a third filter capacitor and a fourth filter capacitor, the third filter capacitor is connected in series between the second input end of the meter reading controller and the second end of the secondary side of the second signal transformer, the fourth filter capacitor is connected in series between the first input end of the meter reading controller and the first end of the secondary side of the second signal transformer, and the third filter capacitor and the fourth filter capacitor are used as an X capacitor together and used for filtering alternating current lower than 100 Hz.
A detection device having the power line carrier filtering apparatus described above.
Compared with the prior art, the utility model has at least the following beneficial effects:
the utility model filters the carrier interference in the commercial power through the first filter and the second filter, and simultaneously filters the carrier interference generated by self power supply in the device, thereby solving the problem of complex power line carrier environment in the production test environment; secondly, the carrier signals are isolated inside the device through the two filters, so that the carrier signals cannot flow out of the commercial power to influence the normal operation of other carrier devices; finally, the modules used in the utility model are common equipment in the market, are suitable for most of carrier communication equipment in the market at present, and have strong universality. And the multi-equipment can be realized by only changing the connecting seat of the tested module, and the same meter reading controller can be quickly replaced so as to adapt to different carrier communication equipment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a circuit diagram of a power line carrier filter device according to an embodiment of the present utility model;
fig. 2 is a block diagram of a power line carrier filter according to an embodiment of the present utility model.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
As smart meters are rapidly popularized in China, the demand of smart meter modules continues to increase, and a communication mode between a communication module and a meter controller in the smart meter module is usually power line carrier communication. However, in the production test process, high-power loads such as a chip mounter and a wave soldering furnace in a factory continuously run, meanwhile, the test devices mutually interfere, the power line carrier environment is easy to be complex, the carrier signal is interfered to work, and carrier communication in the test environment is very unreliable.
Therefore, in order to solve the technical problems of complex power line carrier environment and large interference of the carrier communication module in the production test process in the prior art, a power line carrier filtering device is provided, which comprises:
the first filtering module is an EMI filter and is used for filtering noise interference in the mains supply and preventing the noise interference in the mains supply from affecting carrier communication;
the second filtering module is an EMI filter and is used for filtering ripple interference in the switching power supply and preventing carrier signals in the device from flowing out of the mains supply to influence the normal operation of other carrier devices;
the switching power supply is used for converting 220V commercial power into 12V power to supply power to the module to be tested;
the attenuator comprises a first attenuator and a second attenuator, and is used for adjusting an attenuation coefficient and detecting the attenuation capacity of the carrier device;
the controller is used for receiving and transmitting carrier signals to judge the attenuation capacity of the carrier device;
the signal transformer comprises a first signal transformer and a second signal transformer and is used for signal coupling;
the third filtering module is used for filtering alternating current lower than 100 Hz;
the fourth filtering module is used for filtering alternating current lower than 100 Hz;
in summary, the power line carrier filter device provided by the utility model filters noise interference in the mains supply and ripple waves generated by the switching power supply through the two EMI filters, and provides a better carrier communication environment for the carrier device; meanwhile, carrier signals generated in the carrier device are isolated inside the carrier device, so that the commercial power is prevented from flowing out, and other carrier devices are influenced.
The principles and structures of the present utility model are described in detail below with reference to the drawings and the examples.
Fig. 2 is a block diagram of a power line carrier filter according to an embodiment of the utility model. And after the 220V mains supply filters noise interference in the mains supply through the first EMI filtering module, the noise interference flows to the switching power supply and the second EMI filtering module. The switching power supply converts 220V commercial power into 12V power to supply power to the module to be tested, and the second EMI filtering module filters ripple interference generated by the switching power supply and prevents carrier signals generated in the carrier device from flowing out of the 220V commercial power. 220V commercial power is used for carrier communication by outputting a standard 50Hz 220V power supply after passing through the two EMI filtering modules, and is connected to the output end of the module to be tested. The input end of the attenuator is also connected with the output end of the module to be tested and used for adjusting the attenuation coefficient of the carrier signal. The controller is connected to the output end of the attenuator for receiving and transmitting carrier signals.
Fig. 1 is a circuit diagram of a power line carrier filter device according to an embodiment of the utility model. The power line carrier filtering device provided by the embodiment of the utility model comprises: the device comprises a switching power supply PS1, a detection module, a first filtering module FL1 and a second filtering module FL2.
One side of the switching power supply PS1 is carried on 220V mains supply, and the other side of the switching power supply PS1 is connected to the Module to be tested and used for converting the 220V mains supply into a 12V power supply to supply power to the Module to be tested. The detection Module is connected with the output side L-M, N-M of the Module to be detected and is used for detecting the attenuation capacity of the device. The first filtering Module FL1 is connected in series between the switching power supply PS1 and 220V commercial power, and can filter noise interference in the 220V commercial power, so as to avoid the influence of the noise interference in the 220V commercial power on carrier communication of the Module to be tested. One side of the second filtering Module FL2 is connected between the first filtering Module FL1 and the switching power supply PS1, and the other side is connected between the Module to be tested and the detection Module. The second filtering Module FL2 can isolate the carrier signal generated by the Module to be tested or the detection Module inside the device, and the carrier signal cannot flow out of the commercial power to influence the normal operation of other carrier devices; meanwhile, ripple waves generated by the switching power supply PS1 can be filtered out, so that the influence on carrier communication of a Module to be tested is prevented. After 220V mains supply passes through the two filtering modules, standard 50Hz and 220V power supply can be output for carrier communication.
Specifically, the detection Module comprises a first attenuator U1, a second attenuator U2 and a shoveling controller U3, the attenuators are connected to the output side L-M, N-M of the Module to be detected and used for adjusting the attenuation coefficient of a carrier signal, and the shoveling controller U3 is connected to the output side of the attenuators and used for judging the attenuation capacity of the device by receiving and transmitting the carrier signal.
Referring to fig. 1, an input end (port 4 of U1) of the first attenuator U1 is used as a first input end of the detection Module, and is connected to a first output end N-M of the Module to be detected, and an input end (port 4 of U2) of the second attenuator U2 is used as a second input end of the detection Module, and is connected to a second output end L-M of the Module to be detected.
The power line carrier wave filtering device provided by the embodiment of the utility model further comprises a first signal transformer T1 and a second signal transformer T2, wherein the first signal transformer T1 is connected between the Module to be tested and the attenuator, and the second signal transformer is connected between the attenuator and the shoveling controller U3 and used for signal coupling.
Referring to fig. 1, a first end (port 1 of T1) of a primary side of a first signal transformer T1 is connected to an input end (port 4 of U2) of a second attenuator U2, a second end (port 2 of T1) of the primary side is connected to an input end (port 4 of U1) of the first attenuator U1, a first end (port 3 of T1) of a secondary side of the first signal transformer T1 is connected to a first output end N-M of a module to be tested mobile, and a second end is connected to a second output end L-M of the module to be tested mobile. The first end (port 1 of T2) of the primary side of the second signal transformer T2 is connected to the output end (port 2 of U1) of the first attenuator U1, the second end (port 2 of T2) of the primary side is connected to the second output end (port 2 of U2) of the second attenuator U2, the first end (port 3 of T2) of the secondary side of the second signal transformer T2 is connected to the first input end plc+ of the controller U3, and the second end (port 4 of T2) of the secondary side is connected to the second input end PLC-of the controller U3.
When the power line carrier communication distance is large, the carrier signal reaches the meter reading controller U3, and the signal can be attenuated to be unrecognizable, so that a signal transformer is respectively arranged at the sending end to-be-tested Module and the receiving end meter reading controller U3, and the carrier signal is output through the signal transformer, so that the carrier signal is enhanced, and the carrier signal can be transmitted to a longer distance; secondly, a signal transformer is added to a Module to be tested at a transmitting end and a copying controller U3 at a receiving end, so that interference of the outside on carrier signals in the transmission process can be reduced, and the anti-interference capability is enhanced; in addition, the signal transformer can enhance the compatibility of the Module to be tested at the transmitting end and the controller U3 at the receiving end, and the normal transmission of the carrier signal is not affected when the level of the transmitting end and the level of the receiving end are different.
The power line carrier wave filtering device provided by the embodiment of the utility model further comprises a third filtering Module and a fourth filtering Module, wherein the third filtering Module comprises at least one pair of filtering capacitors which are a first filtering capacitor C1 and a second filtering capacitor C2 respectively, and the first filtering capacitor C1 and the second filtering capacitor C2 are connected in series between a Module to be detected and a first signal transformer T1; the fourth filter module comprises at least a pair of filter capacitors C3 and C4, namely a third filter capacitor C3 and a fourth filter capacitor C4, and the third filter capacitor C3 and the fourth filter capacitor C4 are connected in series between the shoveling controller U3 and the second signal transformer T2.
Referring to fig. 1, a first filter capacitor C1 is connected in series between a second input terminal L-M of the Module to be tested and a second terminal (a port 4 of the T1) of the second side of the first signal transformer T1, and a second filter capacitor C2 is connected in series between a first input terminal N-M of the Module to be tested and a first terminal (a port 3 of the T1) of the second side of the first signal transformer T1. The third filter capacitor C3 is connected in series between the second input terminal PLC of the controller U3 and the second terminal (port 4 of T2) of the secondary side of the second signal transformer T2, and the fourth filter capacitor C4 is connected in series between the first input terminal plc+ of the controller U3 and the first terminal (port 3 of T2) of the secondary side of the second signal transformer T2.
Since the attenuator needs to operate under weak current, a filter capacitor is arranged for isolating alternating current below 100Hz in 220V, and a 12V high-frequency signal is remained. The power line carrier signal is a high-frequency signal, so the arrangement of the filter capacitors C1, C2, C3 and C4 has no influence on the transmission of the carrier signal.
According to the actual filtering requirement, the first filtering module FL1 and the second filtering module FL2 both adopt EMI filters. Referring to fig. 1, a first end (port 1 of FL 1) of a primary side of the first filtering module FL1 is connected to a first input end (port 1 of PS 1) of the switching power supply PS1, a second end (port 2 of FL 1) of the primary side is grounded, a first end (port 3 of FL 1) of a secondary side of the first filtering module FL1 is connected to a second input end (port 2 of PS 1) of the switching power supply PS1, and a second end (port 4 of FL 1) of the secondary side is connected to 220V mains supply. The first end (port 1 of FL 2) of the primary side of the second filter Module FL2 is connected between the first output terminal N-M of the Module under test Module and the first input terminal of the detection Module, the second end (port 2 of FL 2) of the primary side is connected between the first end (port 1 of FL 1) of the primary side of the first filter FL1 and the first input terminal (port 1 of PS 1) of the switching power supply PS1, the first end (port 3 of FL 2) of the secondary side of the second filter FL2 is connected between the second output terminal L-M of the Module under test Module and the second input terminal of the detection Module, and the second end (port 4 of FL 2) of the secondary side of the second filter Module FL2 is connected between the first end (port 3 of FL 1) of the secondary side of the first filter Module FL1 and the second input terminal (port 2 of PS 1) of the switching power supply PS 1.
The embodiment of the utility model also discloses a detection device which is provided with the power line carrier filtering device.
Compared with the prior art, the utility model is provided with two EMI filters for filtering noise interference in the mains supply and ripple waves generated by the switching power supply, thereby providing a better carrier communication environment for the carrier device; the problem of complex power line carrier environment in a production test environment is solved; meanwhile, carrier signals generated in the carrier device are isolated inside the carrier device, so that the commercial power is prevented from flowing out, and other carrier devices are influenced; finally, the modules used in the utility model are all common equipment in the market, are suitable for most of the carrier communication equipment in the market at present, and can realize multiple equipment by only changing the connecting seat of the tested module, and the same meter reading controller can be quickly replaced so as to be suitable for different carrier communication equipment, thereby having strong universality.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.
Claims (10)
1. A power line carrier filtering apparatus comprising:
one side of the switching power supply is carried on the mains supply, and the other side of the switching power supply is connected to the module to be tested and is used for supplying power to the module to be tested;
the detection module is connected with the output side of the module to be detected and is used for detecting the communication capacity of the module to be detected;
the power line carrier filtering device is characterized by further comprising a first filtering module connected in series between the switching power supply and the mains supply, and a second filtering module, wherein one side of the second filtering module is connected between the first filtering module and the switching power supply, the other side of the second filtering module is connected between the module to be detected and the detection module, and the power line carrier filtering device filters ripples generated in the mains supply and the switching power supply through the first filtering module and the second filtering module.
2. The power line carrier filter apparatus according to claim 1, wherein the detection module includes an attenuator connected to an output side of the module under test and adapted to adjust an attenuation coefficient, and a controller connected to an output side of the attenuator and adapted to transmit and receive a carrier signal.
3. The power line carrier filter apparatus of claim 2, further comprising a first signal transformer connected between the module under test and the attenuator, and a second signal transformer connected between the attenuator and the controller.
4. The power line carrier filter device of claim 3, further comprising a third filter module connected between the first signal transformer and the module under test, the third filter module comprising at least one pair of filter capacitors connected in series between the module under test and the first signal transformer.
5. The power line carrier filter device of claim 3, further comprising a fourth filter module connected between the controller and the second signal transformer, the fourth filter module comprising at least one pair of filter capacitors connected in series between the controller and the second signal transformer.
6. The power line carrier filter device according to claim 1, wherein the first filter module and the second filter module each employ an EMI filter, and a first end of a primary side of the first filter module is connected to a first input end of the switching power supply, and a second end of a secondary side of the first filter module is grounded, and a first end of the secondary side of the first filter module is connected to a second input end of the switching power supply, and a second end of the second filter module is connected to a commercial power;
the first end of the primary side of the second filter module is connected between the first output end of the module to be detected and the first input end of the detection module, the second end of the second filter module is connected between the first end of the primary side of the first filter module and the first input end of the switching power supply, the first end of the secondary side of the second filter module is connected between the second output end of the module to be detected and the second input end of the detection module, and the second end of the secondary side of the second filter module is connected between the first end of the secondary side of the first filter module and the second input end of the switching power supply.
7. A power line carrier filter device according to claim 3, wherein the attenuators are provided in two, a first attenuator and a second attenuator, respectively;
the input end of the first attenuator is used as a first input end of the detection module and is connected with a first output end of the module to be detected, and the input end of the second attenuator is used as a second input end of the detection module and is connected with a second output end of the module to be detected;
the first end of the primary side of the first signal transformer is connected to the input end of the second attenuator, the second end of the first signal transformer is connected to the input end of the first attenuator, the first end of the secondary side of the first signal transformer is connected to the first output end of the module to be tested, and the second end of the second signal transformer is connected to the second output end of the module to be tested;
the first end of the primary side of the second signal transformer is connected to the output end of the first attenuator, the second end of the second signal transformer is connected to the second output end of the second attenuator, and the first end of the secondary side of the second signal transformer is connected to the first input end of the meter reading controller, and the second end of the second signal transformer is connected to the second input end of the meter reading controller.
8. The power line carrier filter device according to claim 4, wherein the third filter module comprises a first filter capacitor and a second filter capacitor, the first filter capacitor is connected in series between the second input end of the module to be tested and the second end of the secondary side of the first signal transformer, the second filter capacitor is connected in series between the first input end of the module to be tested and the first end of the secondary side of the first signal transformer, and the first filter capacitor and the second filter capacitor are used together as an X capacitor for filtering alternating current lower than 100 Hz.
9. The power line carrier filter device according to claim 5, wherein the fourth filter module includes a third filter capacitor and a fourth filter capacitor, the third filter capacitor is connected in series between the second input end of the controller and the second end of the secondary side of the second signal transformer, the fourth filter capacitor is connected in series between the first input end of the controller and the first end of the secondary side of the second signal transformer, and the third filter capacitor and the fourth filter capacitor together serve as an X capacitor for filtering alternating current lower than 100 Hz.
10. A detection device, characterized in that it has a power line carrier filtering arrangement as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320961725.1U CN219802328U (en) | 2023-04-25 | 2023-04-25 | Power line carrier wave filtering device and detection equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320961725.1U CN219802328U (en) | 2023-04-25 | 2023-04-25 | Power line carrier wave filtering device and detection equipment |
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| Publication Number | Publication Date |
|---|---|
| CN219802328U true CN219802328U (en) | 2023-10-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320961725.1U Active CN219802328U (en) | 2023-04-25 | 2023-04-25 | Power line carrier wave filtering device and detection equipment |
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| Country | Link |
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| CN (1) | CN219802328U (en) |
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