CN114167127A - Self-powered current transformer - Google Patents
Self-powered current transformer Download PDFInfo
- Publication number
- CN114167127A CN114167127A CN202111405387.5A CN202111405387A CN114167127A CN 114167127 A CN114167127 A CN 114167127A CN 202111405387 A CN202111405387 A CN 202111405387A CN 114167127 A CN114167127 A CN 114167127A
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- Prior art keywords
- module
- current
- self
- wireless
- monitoring system
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/24—Magnetic cores
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/2823—Wires
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase AC
- H01F38/28—Current transformers
- H01F38/30—Constructions
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase AC
- H01F38/28—Current transformers
- H01F38/32—Circuit arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/20—Instruments transformers
- H01F38/22—Instruments transformers for single phase AC
- H01F38/28—Current transformers
- H01F38/30—Constructions
- H01F2038/305—Constructions with toroidal magnetic core
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The self-powered current transformer comprises a magnetic core, wherein the magnetic core is coupled on a test circuit, two secondary side windings are arranged on the magnetic core and are respectively connected with a mutual inductance energy taking module and a wireless current monitoring system, the output end of the mutual inductance energy taking module is connected with an energy storage module, the energy storage module is used for supplying power for the wireless current monitoring system, and the wireless current monitoring system comprises a current sampling module, a signal processing module, a microcontroller and a wireless communication module. The current transformer adopts the double-winding current transformer, can simultaneously meet the power supply requirement and the current acquisition requirement of a wireless current monitoring system through two secondary side windings on the magnetic core, does not need an external power supply to supply power, and reduces the design cost of the wireless current monitoring system.
Description
Technical Field
The invention relates to a current transformer, in particular to a self-powered current transformer.
Background
As power monitoring equipment gradually develops towards a wireless direction, a wireless current monitoring system is produced, a current transformer is used as an element for collecting current in the wireless current monitoring system and is an instrument for converting a large primary side current into a small secondary side current to measure according to an electromagnetic induction principle, and because no power supply device is arranged in the current transformer, the current transformer does not need to be supplied with power from the outside during normal operation, and other elements in the wireless current monitoring system do not work, such as a signal processing module and a wireless communication module, the elements need to be supplied with power from the outside during normal operation, so that an external power supply is required in the wireless current monitoring system to supply power, and the design cost of the wireless current monitoring system is increased.
Disclosure of Invention
The invention provides a self-powered current transformer for solving the defects of the prior art.
The self-powered current transformer comprises a magnetic core, wherein the magnetic core is coupled on a test circuit, two secondary side windings are arranged on the magnetic core and are respectively connected with a mutual inductance energy taking module and a wireless current monitoring system, the output end of the mutual inductance energy taking module is connected with an energy storage module, and the energy storage module is used for supplying power for the wireless current monitoring system.
Preferably, the mutual inductance energy-obtaining module comprises a rectifying circuit and a DC/DC converter, the rectifying circuit is connected with the secondary winding and rectifies the current flowing out of the secondary winding, and the DC/DC converter is used for converting the direct current output by the rectifying circuit into the direct current capable of being charged by the energy storage module.
Preferably, a filtering and voltage stabilizing circuit is arranged between the rectifying circuit and the DC/DC converter.
Preferably, a main power module and an auxiliary power module are arranged in the energy storage module, the input end of the main power module is connected with the mutual inductance energy-taking module, the main power module is used for supplying power for the wireless current monitoring system, the input end of the auxiliary power module is connected with an external power supply, and an AC/DC converter is arranged between the auxiliary power module and the output end of the auxiliary power module and the input end of the main power module.
Preferably, the wireless current monitoring system comprises a current sampling module, a signal processing module, a microcontroller and a wireless communication module, wherein a sampling resistor R is connected between the input end of the current sampling module and the secondary side winding in parallel, the output end of the current sampling module is connected with the signal processing module, the signal processing module performs analog-to-digital conversion on a current signal output by the current sampling module to obtain a digital signal, the microcontroller monitors the voltage in the energy storage module on one hand and controls the mutual inductance energy-taking module to charge the energy storage module, and on the other hand, the signal processing module is controlled to transmit the digital signal to the wireless communication module for wireless communication.
Preferably, a signal amplifying circuit is arranged between the current sampling module and the signal processing module.
Preferably, the wireless communication module is a local area network transceiver.
Preferably, the wireless communication module is a radio frequency transceiver, and a DC/AC converter is arranged between the radio frequency transceiver and the energy storage module.
Has the advantages that: the invention discloses a self-powered current transformer, which adopts a double-winding current transformer, can simultaneously meet the power supply requirement and the current acquisition requirement of a wireless current monitoring system through two secondary side windings on a magnetic core, does not need an external power supply for supplying power, reduces the design cost of the wireless current monitoring system, and is provided with a secondary power supply module for charging the primary power supply module besides a primary power supply module for supplying power to the wireless current monitoring system in an energy storage module of the current transformer, thereby further ensuring the normal power supply of the energy storage module and preventing the loss of current data.
Drawings
FIG. 1 is a schematic diagram of a self-powered current transformer;
in the figure: 1. magnetic core 2, test circuit 3, secondary side winding.
Detailed Description
For the purpose of enhancing the understanding of the present invention, the present invention will be described in further detail with reference to the following examples and the accompanying drawings, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.
As shown in fig. 1, the self-powered current transformer comprises a magnetic core 1, wherein the magnetic core 1 is coupled to a test circuit 2, two secondary windings 3 are arranged on the magnetic core 1, the two secondary windings 3 are respectively connected with a mutual inductance energy-taking module and a wireless current monitoring system, an output end of the mutual inductance energy-taking module is connected with an energy storage module, and the energy storage module is used for supplying power to the wireless current monitoring system.
In this embodiment, the mutual inductance energy-obtaining module includes a rectifying circuit and a DC/DC converter, the rectifying circuit is connected to the secondary winding and rectifies a current flowing from the secondary winding, and the DC/DC converter is configured to convert a direct current output by the rectifying circuit into a direct current that can be charged by the energy storage module.
In this embodiment, a filter voltage stabilizing circuit is disposed between the rectifying circuit and the DC/DC converter.
In this embodiment, a main power module and an auxiliary power module are arranged in the energy storage module, an input end of the main power module is connected with the mutual inductance energy-taking module, the main power module is used for supplying power to the wireless current monitoring system, an input end of the auxiliary power module is connected with an external power supply, and an AC/DC converter is arranged between the auxiliary power module and an output end of the auxiliary power module and an input end of the main power module.
In this embodiment, wireless current monitoring system includes current sampling module, signal processing module, microcontroller and wireless communication module, parallelly connected being equipped with sampling resistor R between current sampling module's the input and the secondary side winding, current sampling module's output links to each other with signal processing module, signal processing module carry out analog-to-digital conversion to the current signal of current sampling module output and obtain digital signal, microcontroller control the voltage in the energy storage module on the one hand, control mutual inductance and get the ability module and charge for the energy storage module, on the other hand control signal processing module carries out wireless communication with digital signal transmission to wireless communication module.
In this embodiment, a signal amplifying circuit is disposed between the current sampling module and the signal processing module.
In this embodiment, the wireless communication module is a local area network transceiver.
In this embodiment, the wireless communication module is a radio frequency transceiver, and a DC/AC converter is disposed between the radio frequency transceiver and the energy storage module.
This current transformer has adopted bifilar current transformer, can satisfy power supply demand and the current acquisition demand of wireless current monitoring system simultaneously through two secondary side windings on the magnetic core, need not external power supply and come the power supply, the design cost of wireless current monitoring system has been reduced, except being equipped with the main power module that is used for giving the power supply of wireless current monitoring system in this current transformer's the energy storage module in addition, still be equipped with the secondary power module that is used for charging for main power module, the normal power supply of energy storage module has further been guaranteed, the loss of current data has been prevented.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A self-powered current transformer is characterized by comprising a magnetic core, wherein the magnetic core is coupled on a test circuit, two secondary side windings are arranged on the magnetic core, the two secondary side windings are respectively connected with a mutual inductance energy taking module and a wireless current monitoring system, the output end of the mutual inductance energy taking module is connected with an energy storage module, and the energy storage module is used for supplying power to the wireless current monitoring system.
2. A self-powered current transformer as claimed in claim 1, wherein the mutual inductance energy-obtaining module comprises a rectifying circuit and a DC/DC converter, the rectifying circuit is connected to the secondary winding and rectifies the current flowing out from the secondary winding, and the DC/DC converter is configured to convert the DC power output by the rectifying circuit into DC power for charging the energy storage module.
3. A self-powered current transformer according to claim 2, wherein a filter and voltage regulator circuit is provided between the rectifying circuit and the DC/DC converter.
4. A self-powered current transformer according to claim 1, wherein a main power module and a secondary power module are arranged in the energy storage module, an input end of the main power module is connected with the mutual inductance energy-taking module, the main power module is used for supplying power to a wireless current monitoring system, an input end of the secondary power module is connected with an external power supply, and an AC/DC converter is arranged between the secondary power module and the output end and between the secondary power module and the input end of the main power module.
5. The self-powered current transformer of claim 1, wherein the wireless current monitoring system comprises a current sampling module, a signal processing module, a microcontroller and a wireless communication module, a sampling resistor R is connected in parallel between an input end of the current sampling module and the secondary winding, an output end of the current sampling module is connected to the signal processing module, the signal processing module performs analog-to-digital conversion on a current signal output by the current sampling module to obtain a digital signal, the microcontroller monitors a voltage in the energy storage module to control the mutual inductance energy-taking module to charge the energy storage module, and controls the signal processing module to transmit the digital signal to the wireless communication module for wireless communication.
6. A self-powered current transformer according to claim 5, wherein a signal amplification circuit is disposed between the current sampling module and the signal processing module.
7. The self-powered current transformer of claim 5, wherein the wireless communication module is a local area network transceiver.
8. The self-powered current transformer as claimed in claim 5, wherein the wireless communication module is a radio frequency transceiver, and a DC/AC converter is disposed between the radio frequency transceiver and the energy storage module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111405387.5A CN114167127A (en) | 2021-11-24 | 2021-11-24 | Self-powered current transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111405387.5A CN114167127A (en) | 2021-11-24 | 2021-11-24 | Self-powered current transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114167127A true CN114167127A (en) | 2022-03-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111405387.5A Pending CN114167127A (en) | 2021-11-24 | 2021-11-24 | Self-powered current transformer |
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| Country | Link |
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| CN (1) | CN114167127A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116008897A (en) * | 2023-03-21 | 2023-04-25 | 青岛鼎信通讯股份有限公司 | Electric energy meter metering current transformer monitoring device |
| CN119480396A (en) * | 2025-01-10 | 2025-02-18 | 山东富澳电力设备有限公司 | A combined transformer for new energy and its installation and configuration method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006121850A (en) * | 2004-10-22 | 2006-05-11 | Yuan Ze Univ | High step-up ratio converter using two-way magnetic circuit energy transfer of coupling inductor. |
| CN201536250U (en) * | 2009-10-14 | 2010-07-28 | 南京谷峰电子科技有限公司 | Self-power protective device |
| CN202307493U (en) * | 2011-09-22 | 2012-07-04 | 镇江市丹高电器有限公司 | Electronic type current transformer |
| WO2015143885A1 (en) * | 2014-03-28 | 2015-10-01 | 江苏省电力公司常州供电公司 | Power cable intelligent grounding box |
| CN108663561A (en) * | 2018-07-12 | 2018-10-16 | 河南森源电气股份有限公司 | A kind of self-powered multifunctional electric meter |
| CN109270337A (en) * | 2018-12-06 | 2019-01-25 | 石家庄杰泰特动力能源有限公司 | Passive and wireless current sensor based on double-winding current mutual inductor |
| CN209264817U (en) * | 2018-12-06 | 2019-08-16 | 石家庄杰泰特动力能源有限公司 | Passive wireless current sensor based on double-winding current transformer |
| CN110208597A (en) * | 2019-05-23 | 2019-09-06 | 宁波大学 | A kind of self-power wireless current monitoring system based on simplex winding current transformer |
-
2021
- 2021-11-24 CN CN202111405387.5A patent/CN114167127A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006121850A (en) * | 2004-10-22 | 2006-05-11 | Yuan Ze Univ | High step-up ratio converter using two-way magnetic circuit energy transfer of coupling inductor. |
| CN201536250U (en) * | 2009-10-14 | 2010-07-28 | 南京谷峰电子科技有限公司 | Self-power protective device |
| CN202307493U (en) * | 2011-09-22 | 2012-07-04 | 镇江市丹高电器有限公司 | Electronic type current transformer |
| WO2015143885A1 (en) * | 2014-03-28 | 2015-10-01 | 江苏省电力公司常州供电公司 | Power cable intelligent grounding box |
| CN108663561A (en) * | 2018-07-12 | 2018-10-16 | 河南森源电气股份有限公司 | A kind of self-powered multifunctional electric meter |
| CN109270337A (en) * | 2018-12-06 | 2019-01-25 | 石家庄杰泰特动力能源有限公司 | Passive and wireless current sensor based on double-winding current mutual inductor |
| CN209264817U (en) * | 2018-12-06 | 2019-08-16 | 石家庄杰泰特动力能源有限公司 | Passive wireless current sensor based on double-winding current transformer |
| CN110208597A (en) * | 2019-05-23 | 2019-09-06 | 宁波大学 | A kind of self-power wireless current monitoring system based on simplex winding current transformer |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116008897A (en) * | 2023-03-21 | 2023-04-25 | 青岛鼎信通讯股份有限公司 | Electric energy meter metering current transformer monitoring device |
| CN119480396A (en) * | 2025-01-10 | 2025-02-18 | 山东富澳电力设备有限公司 | A combined transformer for new energy and its installation and configuration method |
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Application publication date: 20220311 |