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Fluxgate digital current sensor based on pulse amplitude detection method

A technology of pulse amplitude and digital current, which is applied in the direction of voltage/current isolation and measurement using digital measurement technology, can solve the problems of precision fluxgate current sensor relying on imports, solve the technical and cost problems of implementation, and have no positional deviation , The effect of frequency bandwidth

Pending Publication Date: 2021-05-25
唐新颖
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  • Abstract
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  • Application Information

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Problems solved by technology

[0008] However, due to the monopoly of foreign core technologies, the precision fluxgate current sensors widely used in China are almost entirely dependent on imports.

Method used

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  • Fluxgate digital current sensor based on pulse amplitude detection method
  • Fluxgate digital current sensor based on pulse amplitude detection method
  • Fluxgate digital current sensor based on pulse amplitude detection method

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Embodiment Construction

[0042] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0043] Please refer to Figures 1 to 9 As shown, a fluxgate digital current sensor based on the pulse amplitude detection method comprises the following steps;

[0044] S1, the system is powered on, the software part and the hardware part are initialized and started to work;

[0045] S2, the excitation unit 102 self-oscillates to generate a sinusoidal excitation current with an angular frequency ω to form an excitation magnetic field H e , so that the reciprocating magnetization of the magnetic core reaches saturation, and the current Ip to be measured flows through th...

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Abstract

The invention provides a fluxgate digital current sensor based on a pulse amplitude detection method. The fluxgate digital current sensor comprises a probe unit, an excitation unit, a signal processing unit, an MCU main control unit and an output unit, wherein the excitation unit is connected with the probe unit, the excitation unit generates a sine wave signal, sine excitation current with the angular frequency of omega is applied to an excitation coil of the probe unit, and an excitation magnetic field He is generated; the probe unit is connected through the signal processing unit and is used for converting Ip measurement to be measured into excitation current Iex; the signal processing unit is connected with the main control unit and converts the excitation current Iex into voltage measurement Uex through a sampling resistor Rs and an operational amplifier; the main control unit MCU mainly completes the frequency control, detection and data processing functions of the excitation unit, and calculates the current Ip to be measured according to the sampled voltage Uex; the output unit is a CAN bus interface, is connected with the main control unit, and provides a communication interface for a sensor and other main control equipment.

Description

technical field [0001] The invention belongs to the field of direct current large current measurement, in particular to a fluxgate digital direct current large current sensor based on a pulse amplitude detection method. Background technique [0002] DC large current measurement is widely used in electric power, electrical or electronic equipment, mainly used for energy management, equipment monitoring and protection and other functions. At present, the main types of sensors that realize DC large current measurement include: DC shunts, Hall current sensors, and fluxgate current sensors. [0003] The DC shunt is made according to the principle that a voltage is generated at both ends of the resistor when a DC current passes through the resistor. The advantages are high precision, fast response, and low cost. The disadvantage is that the measurement circuit is not electrically isolated from the measured current, which poses a safety hazard. Resistive shunts are suitable for lo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25G01R15/20
CPCG01R19/25G01R15/20
Inventor 刘玉正唐新颖
Owner 唐新颖
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