CN115356516A - Current detection device and electric appliance with parallel-arranged wires - Google Patents
Current detection device and electric appliance with parallel-arranged wires Download PDFInfo
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- CN115356516A CN115356516A CN202210825013.7A CN202210825013A CN115356516A CN 115356516 A CN115356516 A CN 115356516A CN 202210825013 A CN202210825013 A CN 202210825013A CN 115356516 A CN115356516 A CN 115356516A
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- magnetic field
- field sensor
- conductor
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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
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/02—General constructional details
- G01R1/18—Screening arrangements against electric or magnetic fields, e.g. against earth's field
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- General Physics & Mathematics (AREA)
- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
Abstract
The invention provides a current detection device for measuring the current flowing in a conductor to be detected, which comprises: the first magnetic field sensor and the second magnetic field sensor sense magnetic field signals generated by current in the conductor to be measured in opposite directions and convert the magnetic field signals into electric signals; and a signal processing device connected to the magnetic field sensors, for performing signal processing to suppress common mode noise by performing a differential operation on output signals of the two magnetic field sensors. The invention also provides an electric appliance with the parallel-arranged wires. The invention induces the magnetic field signals generated by the current in the conductor to be measured in the opposite direction, and removes the output signals of the two magnetic field sensors by performing differential operation through a subsequent signal processing device, thereby inhibiting the common mode noise generated by the adjacent wires.
Description
Technical Field
The invention relates to the field of electrical detection, in particular to a current detection device and an electrical appliance with parallel-arranged wires.
Background
The current detection means external detection of a current flowing through a wire without interference, and is generally performed by a magnetic field induction method. And for the scheme of heavy current or multichannel current detection, the interference generated by adjacent current must be considered, so that electromagnetic shielding needs to be carried out on the detection environment, and the whole structure is complicated, high in cost and large in size.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a current detection device and an electric appliance with parallel arranged leads, which have simple structure and can reduce cost and volume.
In order to solve the above problem, the present invention provides a current detection apparatus for measuring a current flowing in a conductor to be measured, including: the first magnetic field sensor and the second magnetic field sensor are used for sensing magnetic field signals generated by current in the conductor to be measured and converting the magnetic field signals into electric signals; and a signal processing device connected to the magnetic field sensors, for performing signal processing to suppress common mode noise by performing a differential operation on output signals of the two magnetic field sensors.
In order to solve the above problems, the present invention provides an electrical appliance with parallel wiring conductors, including a current detection device for detecting a current flowing in the parallel wiring conductors, the current detection device including: the first magnetic field sensor and the second magnetic field sensor sense magnetic field signals generated by current in the conductor to be measured in opposite directions and convert the magnetic field signals into electric signals; and a signal processing device connected to the magnetic field sensors, for performing signal processing to suppress common mode noise by performing a differential operation on output signals of the two magnetic field sensors.
The first magnetic field sensor and the second magnetic field sensor in the current detection device of the invention induce magnetic field signals generated by current in the conductor to be detected in opposite directions, and for the magnetic field signals close to the conducting wire, the first magnetic field sensor and the second magnetic field sensor induce in the same direction. And the subsequent signal processing device is used for carrying out differential operation on the output signals of the two magnetic field sensors to remove the output signals, so that common mode noise generated by adjacent wires can be suppressed.
Drawings
FIG. 1A is a schematic diagram illustrating the arrangement of magnetic field sensors in accordance with one embodiment of the present invention;
FIG. 1B is a schematic diagram illustrating the arrangement of magnetic field sensors in accordance with one embodiment of the present invention;
FIG. 2 is an electrical schematic diagram of a current sensing device according to an embodiment of the present invention.
Detailed Description
The following describes in detail a specific embodiment of the current detection apparatus and the electrical apparatus with parallel wires according to the present invention with reference to the drawings.
Fig. 1A is a schematic diagram of an arrangement of magnetic field sensors according to an embodiment of the present invention, which includes a first magnetic field sensor 111 and a second magnetic field sensor 112 for measuring a conductor 10 to be measured. In this embodiment, the conductor to be measured 10 is a strip-shaped wire, and the first magnetic field sensor 111 and the second magnetic field sensor 112 are hall sensors, are opposite to the left and right sides of the strip-shaped wire, and sense the magnetic field signal B in a direction perpendicular to the magnetic field.
Fig. 1B is a schematic diagram of an arrangement of magnetic field sensors according to an embodiment of the present invention, which includes a first magnetic field sensor 121, a second magnetic field sensor 122, and a conductor 10 to be measured. In this embodiment, the conductor 10 to be measured is a strip-shaped wire, and the first magnetic field sensor 121 and the second magnetic field sensor 122 are magnetoresistance effect sensors, are oppositely disposed on the upper and lower sides of the strip-shaped wire, and sense the magnetic field signal B in a direction horizontal to the magnetic field.
In other embodiments, it is also possible to provide opposing magnetic field sensors according to different sensor types, which are arranged such that the first magnetic field sensor 11 and the second magnetic field sensor 12 are arranged to sense the magnetic field signal B generated by the current I in the conductor 10 to be measured in opposite directions.
Fig. 2 is an electrical architecture diagram of a current detection apparatus according to an embodiment of the present invention, for measuring a current flowing in a conductor 10 to be measured, including: first and second magnetic field sensors 11, 12, first and second adjustable gain amplifiers 131, 132, and signal processing device 14. The relative relationship of the magnetic field sensor to the conductive line is shown in fig. 1A and 1B, which are omitted from this figure. If the wire is too wide, the magnetic sensor and the signal processing device may be combined together and then separately placed as described above.
The first adjustable gain amplifier 131 is disposed between the first magnetic field sensor 111 and the signal processing device 14, and is configured to amplify an output signal of the first magnetic field sensor 111; a second adjustable gain amplifier 132 is disposed between the second magnetic field sensor 112 and the signal processing device 14, and is used for amplifying the output signal of the second magnetic field sensor 112. The signal processing device 14 receives the output signals Vopint1 and Vonint1 of the first adjustable gain amplifier 131 and the output signals Vopint2 and Vonint2 of the second adjustable gain amplifier 132, and performs signal processing to perform a differential operation on the output signals of the two magnetic field sensors to suppress common mode noise.
In this embodiment, the signal processing device 14 includes a four-port differential amplifier, and the output signals Vopint1 and Vonint1 of the first adjustable gain amplifier 131 and the output signals Vopint2 and Vonint2 of the second adjustable gain amplifier 132 are respectively input to the first and second positive input terminals and the first and second negative input terminals of the four-port differential amplifier. After the operation of the amplifier, the output differential voltages Vop and Von are determined by the following formula:
Vpo-Von＝G*{(Vopint1-Vonint1)-(Vopint2-Vonint2)}
where G is the gain value of the gain amplifier.
It can be seen that the signals at the positive input end and the negative input end of the four-port differential amplifier are subtracted in the amplifier, so that the common mode noise can be suppressed. In some occasions with low precision requirements, the second magnetic field sensor 12 and the second adjustable gain amplifier 132 are not needed, and the device can work normally; if the precision is required to be improved, the cascade connection can be realized by arranging more groups of magnetic field sensors and adjustable gain amplifiers.
The device can be arranged in electric appliances with parallel wires, such as air conditioners, washing machines, battery cars and the like, and is used for detecting the current flowing in the parallel wires. Because the first magnetic field sensor and the second magnetic field sensor in the current detection device sense the magnetic field signals generated by the current in the conductor to be detected in opposite directions, and the first magnetic field sensor and the second magnetic field sensor sense the magnetic field signals close to the conducting wire in the same direction. It can be seen from the above formula calculation that the output signals of the two magnetic field sensors are removed by performing differential operation through a subsequent signal processing device, so that common mode noise generated by adjacent wires can be suppressed.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A current detecting device for measuring a current flowing in a conductor to be measured, comprising:
the first magnetic field sensor and the second magnetic field sensor sense magnetic field signals generated by current in the conductor to be measured in opposite directions and convert the magnetic field signals into electric signals; and
and a signal processing device connected to the magnetic field sensors, and configured to perform signal processing to suppress common mode noise by performing a differential operation on output signals of the two magnetic field sensors.
2. The apparatus of claim 1, wherein the conductor under test is a strip conductor, and the first and second magnetic field sensors are hall sensors, opposite to the left and right sides of the strip conductor, for sensing magnetic field signals in a direction perpendicular to the magnetic field.
3. The apparatus of claim 1, wherein the conductor to be measured is a strip conductor, and the first and second magnetic field sensors are magnetoresistance effect sensors, are disposed on opposite sides of the strip conductor, and sense the magnetic field signal in a direction horizontal to the magnetic field.
4. The device of claim 1, further comprising an adjustable gain amplifier disposed between the magnetic field sensor and the signal processing device for amplifying the output signal of the magnetic field sensor.
5. The apparatus of claim 1, wherein the signal processing apparatus comprises a four-port differential amplifier, and the electrical signals collected by the first magnetic field sensor and the second magnetic field sensor are respectively input to a positive input terminal and a negative input terminal of the four-port differential amplifier.
6. An electric appliance with parallel-arranged wires, comprising a current detection device for detecting a current flowing in the parallel-arranged wires, characterized in that the current detection device comprises:
the first magnetic field sensor and the second magnetic field sensor sense magnetic field signals generated by current in the conductor to be measured in opposite directions and convert the magnetic field signals into electric signals; and
and a signal processing device connected to the magnetic field sensors, for performing signal processing to perform a differential operation on output signals of the two magnetic field sensors to suppress common mode noise.
7. The electrical appliance according to claim 6, wherein the conductor to be measured is a strip-shaped wire, and the first magnetic field sensor and the second magnetic field sensor are Hall sensors, are oppositely arranged on the left side and the right side of the strip-shaped wire, and sense the magnetic field signal in the direction perpendicular to the magnetic field.
8. The electrical appliance according to claim 6, wherein the conductor to be measured is a strip-shaped wire, and the first magnetic field sensor and the second magnetic field sensor are magnetoresistive effect sensors, are arranged on the upper side and the lower side of the strip-shaped wire oppositely, and sense the magnetic field signal in the direction horizontal to the magnetic field.
9. The electric appliance according to claim 6, further comprising an adjustable gain amplifier disposed between the magnetic field sensor and the signal processing device for amplifying the output signal of the magnetic field sensor.
10. The electric appliance according to claim 6, wherein the signal processing device comprises a four-port differential amplifier, and the electric signals collected by the first magnetic field sensor and the second magnetic field sensor are respectively input to a positive input end and a negative input end of the four-port differential amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210825013.7A CN115356516A (en) | 2022-07-14 | 2022-07-14 | Current detection device and electric appliance with parallel-arranged wires |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210825013.7A CN115356516A (en) | 2022-07-14 | 2022-07-14 | Current detection device and electric appliance with parallel-arranged wires |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115356516A true CN115356516A (en) | 2022-11-18 |
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ID=84032299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210825013.7A Pending CN115356516A (en) | 2022-07-14 | 2022-07-14 | Current detection device and electric appliance with parallel-arranged wires |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115356516A (en) |
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2022
- 2022-07-14 CN CN202210825013.7A patent/CN115356516A/en active Pending
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20230118 Address after: 201203 Pudong New Area, Shanghai, China (Shanghai) free trade trial area, No. 3, 1 1, Fang Chun road. Applicant after: Shanghai Xinggan Semiconductor Co.,Ltd. Address before: 201203 Pudong New Area, Shanghai, China (Shanghai) free trade trial area, No. 3, 1 1, Fang Chun road. Applicant before: SENKO MIRCO-ELECTRONICS CO.,LTD. |
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| TA01 | Transfer of patent application right |