Today we introduce a national invention patent for authorization - electronic energy meter and its shunt, sampling resistor and method to cancel the alternating magnetic field interference of the circuit board. The patent was filed by Xiamen Hongfa Electric Appliance Co., Ltd. and was granted an authorization announcement on November 16, 2016.
Description
The invention relates to the technical field of electronic instruments, in particular to an electronic electric energy meter capable of canceling the alternating magnetic field interference of a circuit board, a shunt thereof, a sampling resistor piece and a method for canceling the alternating magnetic field interference of the circuit board.
Background of the invention
The electronic energy meter is an electronic meter device that records the power consumption by sampling the user's power supply voltage and current in real time. Our living electricity is alternating current, and the changing electric field generates a magnetic field. The electronic energy meter is composed of many components. Under the interference of the magnetic field, an induced current is generated, which brings measurement error. If a chip is disposed on a circuit board, the chip is used to cancel the induced current on the circuit board, but this method not only greatly increases the manufacturing cost of the power meter, but also complicates the structure of the power meter and affects the manufacturing efficiency.
Summary of the invention
Based on the above problems, the present invention provides an electronic energy meter that cancels the alternating magnetic field interference of the circuit board, and a shunt, a sampling resistor, and a method for canceling the alternating magnetic field interference of the circuit board.
In order to achieve the above object, the present invention provides a shunt that is applied to an electronic energy meter, the electronic energy meter includes a circuit board and first and second signal lines, wherein the shunt includes: a first conductive sheet, a sampling resistor piece, a second conductive piece, a first sampling end point and a second sampling end point, the sampling resistor piece is connected between the first conductive piece and the second conductive piece, and is spaced apart from the circuit board and disposed non-perpendicularly, and the sampling resistor piece is a through hole is provided, the first sampling end point and the second sampling end point are disposed on opposite sides of the shunt, the through hole is eccentrically disposed on the sampling resistor piece; wherein the first end of the first signal line is connected to the first sampling end point, The first end of the two signal lines is connected to the second sampling end point and passes through the through hole, and the second end of the first signal line and the second end of the second signal line are respectively connected to the circuit board; the sampling resistor piece is connected to the second signal The line is divided into a first sensing area and a second sensing area, and the first sensing area is not equal to the second sensing area. Under the action of the alternating magnetic field, the first sensing current is generated in the first sensing area, and the second sensing area is produced in the middle. Generating a second induced current, the first induced current is opposite in polarity to the second induced current, and the magnitude is not equal, there is an induced current on the circuit board, a difference between the first induced current and the second induced current, and an induced current on the circuit board The opposite polarity.
The figure is a top view of the electronic electric energy meter of the present invention, wherein the circuit board is not shown The present invention also provides a sampling resistor sheet which is a sampling resistor sheet included in the above-mentioned shunt.
Meanwhile, the present invention also provides an electronic power meter including a circuit board, first and second signal lines, and the above-described shunt.
In addition, the present invention also provides a method for canceling magnetic field interference received by a circuit board of the electronic power meter described above, comprising the steps of: measuring a polarity and a magnitude of an induced current existing on the circuit board; Opening an eccentrically disposed through hole; connecting the first end of the second signal line to the second sampling end point and passing through the through hole, and the second end of the first signal line and the second end of the second signal line are respectively connected to the circuit board The circuit board and the sampling resistor are spaced apart from each other; the second signal line divides the sampling resistor into a first sensing area and a second sensing area, and the first sensing area is not equal to the second sensing area, the first sensing A first induced current is generated in the area, and a second induced current is generated in the second sensing area. The first induced current is opposite in polarity to the second induced current, and the magnitude is not equal, and the difference between the first induced current and the second induced current is The polarity of the induced current on the board is reversed, at least partially offsetting the induced current present on the board, and the magnetic field interference experienced by the board is correspondingly reduced.
The beneficial effects of the present invention over the prior art are: in the present invention, the through-hole is set to be shifted to different degrees with respect to the center of symmetry of the sampling resistor sheet to adjust the induced current generated by the magnetic field interference of the sampling resistor sheet. Direction, by adjusting the distance of the through hole relative to the symmetric center of the resistor, to adjust the magnitude of the induced current generated by the magnetic field interference of the sampling resistor, thereby canceling the induced current in the circuit board by sensing the current difference. Therefore, the sampling resistor of the present invention not only can eliminate the magnetic field interference of the invention, but also can reduce or eliminate the magnetic field interference of the circuit board, and the shunt of the invention can cooperate with the existing electronic energy such as the circuit board and the signal line. The other components of the table are used, so the present invention can not only eliminate the magnetic field interference of the circuit board, but also not greatly increase the cost, and affect the assembly efficiency of the electric energy meter, compared with the existing scheme in which a chip must be added in the circuit board.
Description
The invention relates to the technical field of electronic instruments, in particular to an electronic electric energy meter capable of canceling the alternating magnetic field interference of a circuit board, a shunt thereof, a sampling resistor piece and a method for canceling the alternating magnetic field interference of the circuit board.
Background of the invention
The electronic energy meter is an electronic meter device that records the power consumption by sampling the user's power supply voltage and current in real time. Our living electricity is alternating current, and the changing electric field generates a magnetic field. The electronic energy meter is composed of many components. Under the interference of the magnetic field, an induced current is generated, which brings measurement error. If a chip is disposed on a circuit board, the chip is used to cancel the induced current on the circuit board, but this method not only greatly increases the manufacturing cost of the power meter, but also complicates the structure of the power meter and affects the manufacturing efficiency.
Summary of the invention
Based on the above problems, the present invention provides an electronic energy meter that cancels the alternating magnetic field interference of the circuit board, and a shunt, a sampling resistor, and a method for canceling the alternating magnetic field interference of the circuit board.
In order to achieve the above object, the present invention provides a shunt that is applied to an electronic energy meter, the electronic energy meter includes a circuit board and first and second signal lines, wherein the shunt includes: a first conductive sheet, a sampling resistor piece, a second conductive piece, a first sampling end point and a second sampling end point, the sampling resistor piece is connected between the first conductive piece and the second conductive piece, and is spaced apart from the circuit board and disposed non-perpendicularly, and the sampling resistor piece is a through hole is provided, the first sampling end point and the second sampling end point are disposed on opposite sides of the shunt, the through hole is eccentrically disposed on the sampling resistor piece; wherein the first end of the first signal line is connected to the first sampling end point, The first end of the two signal lines is connected to the second sampling end point and passes through the through hole, and the second end of the first signal line and the second end of the second signal line are respectively connected to the circuit board; the sampling resistor piece is connected to the second signal The line is divided into a first sensing area and a second sensing area, and the first sensing area is not equal to the second sensing area. Under the action of the alternating magnetic field, the first sensing current is generated in the first sensing area, and the second sensing area is produced in the middle. Generating a second induced current, the first induced current is opposite in polarity to the second induced current, and the magnitude is not equal, there is an induced current on the circuit board, a difference between the first induced current and the second induced current, and an induced current on the circuit board The opposite polarity.
The figure is a top view of the electronic electric energy meter of the present invention, wherein the circuit board is not shown
Meanwhile, the present invention also provides an electronic power meter including a circuit board, first and second signal lines, and the above-described shunt.
In addition, the present invention also provides a method for canceling magnetic field interference received by a circuit board of the electronic power meter described above, comprising the steps of: measuring a polarity and a magnitude of an induced current existing on the circuit board; Opening an eccentrically disposed through hole; connecting the first end of the second signal line to the second sampling end point and passing through the through hole, and the second end of the first signal line and the second end of the second signal line are respectively connected to the circuit board The circuit board and the sampling resistor are spaced apart from each other; the second signal line divides the sampling resistor into a first sensing area and a second sensing area, and the first sensing area is not equal to the second sensing area, the first sensing A first induced current is generated in the area, and a second induced current is generated in the second sensing area. The first induced current is opposite in polarity to the second induced current, and the magnitude is not equal, and the difference between the first induced current and the second induced current is The polarity of the induced current on the board is reversed, at least partially offsetting the induced current present on the board, and the magnetic field interference experienced by the board is correspondingly reduced.
The beneficial effects of the present invention over the prior art are: in the present invention, the through-hole is set to be shifted to different degrees with respect to the center of symmetry of the sampling resistor sheet to adjust the induced current generated by the magnetic field interference of the sampling resistor sheet. Direction, by adjusting the distance of the through hole relative to the symmetric center of the resistor, to adjust the magnitude of the induced current generated by the magnetic field interference of the sampling resistor, thereby canceling the induced current in the circuit board by sensing the current difference. Therefore, the sampling resistor of the present invention not only can eliminate the magnetic field interference of the invention, but also can reduce or eliminate the magnetic field interference of the circuit board, and the shunt of the invention can cooperate with the existing electronic energy such as the circuit board and the signal line. The other components of the table are used, so the present invention can not only eliminate the magnetic field interference of the circuit board, but also not greatly increase the cost, and affect the assembly efficiency of the electric energy meter, compared with the existing scheme in which a chip must be added in the circuit board.
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