Magnetic induction intensity quantitative detection circuit

Abstract

The utility model relates to the technical field of magnetic induction intensity detection, in particular to a magnetic induction intensity quantitative detection circuit, which comprises a capacitor CT16, a capacitor CT25, a resistor RT63 and a detection chip HT10, a signal connected to one end of a CPU is defined as MagneticTest, a GND pin of the detection chip HT10 is grounded, an OUT pin is connected with a detection pin of the MagneticTest, a VDD pin is connected with a power supply DVDD, one end of the capacitor CT16 is grounded to GND, the other end of the capacitor CT16 is connected with the detection pin of the MagneticTest, and the other end of the capacitor CT16 is connected with the detection pin of the MagneticTest. One end of the capacitor CT25 is connected with the power supply DVDD, the other end of the capacitor CT25 is grounded GND, one end of the resistor RT63 is connected with the power supply DVDD, and the other end of the resistor RT63 is connected with a VDD pin of the detection chip HT10. According to the utility model, the magnetic induction intensity is quantitatively detected by detecting the output voltage, so that the magnetic field interference intensity suffered by the electric meter is analyzed, and the influence on the functions of the electric meter caused by overlarge magnetic induction intensity is effectively prevented; the sensitivity is high, the anti-interference capability is strong, and the proper detection sensitivity can be selected as required; the circuit is simple in structure and low in cost, and has high adaptability and practicability.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic induction intensity detection, in particular to a magnetic induction intensity quantitative detection circuit. Background Art

[0002] At present, magnetic field measurement technology has been widely used in many fields in my country with its unique advantages, which is of great significance to the development and stability of our country. Magnetic field detection is an important technology, which is widely used in scientific research, industrial production and daily life. The magnetic field is a force field generated by electric current or magnet, which has direction and size. Through magnetic field detection, we can understand the current state, position and properties of the object, so as to realize many practical applications. With the continuous development of science and technology, people have conducted in-depth research on electromagnetic effects and electromagnetic induction, which has promoted the rapid development of magnetic field technology. At this stage, people have broadened the scope of application of magnetic field measurement technology and put forward new requirements for its breadth and accuracy. In order to achieve this demand, it is necessary to further study the development of magnetic field detection technology and innovate magnetic field measurement technology on the basis of existing technology to achieve its stable development.

[0003] The most commonly used magnetic field measurement technology at present is the electromagnetic effect method. The electromagnetic effect mainly makes full use of the current in the conductor. Under the influence of the magnetic field, the electromagnetic effect is generated, and the principles of magnetoelectricity and electromagnetism are used for effective measurement. The Hall effect and the magnetoresistance effect are important components of the electromagnetic effect. The Hall effect is actually a potential difference phenomenon. Its essence is that when the carrier moves in the external magnetic field, it is offset due to the influence of the Lorentz force, and the charge is accumulated at both ends of the material, thereby generating an electric field perpendicular to the current direction. When the carrier is in a state of equilibrium due to the influence of the electric field repulsion and the Lorentz force, a potential difference will be formed. The magnetoresistance effect is similar to the Hall effect and is also caused by the influence of the Lorentz force on the carrier. When the electric field repulsion and magnetic force are in a state of equilibrium, the carriers will gather at both ends to form an electric field. If the carrier speed is slower than the electric field, they will be offset in the direction of the electric field force. If the carrier speed is faster than the electric field, they will be offset in the direction of the Lorentz force, thereby increasing the resistance.

[0004] With the rapid development of the field of smart meters, the requirements for meters are getting higher and higher, so the safety and reliability of meters must be improved. The external constant magnetic field has a great impact on the performance of the chip, especially the power chip, mutual inductor, AD sampling chip, etc. inside the electric energy meter for power measurement, which will be affected by the external magnetic field, thus affecting the measurement accuracy of the electric energy meter. Therefore, it is necessary to use a magnetic field detection chip to detect the magnetic induction intensity of the magnetic field to ensure that the smart meter is not damaged by the magnetic field. However, the most widely used application in the field of smart meters is the detection of magnetic fields. This detection technology can only detect whether there is a magnetic field, but cannot quantitatively detect the magnitude of the magnetic field strength. Utility Model Content

[0005] The utility model aims to solve the above problems and provides a magnetic induction intensity quantitative detection circuit, which adopts the following technical solutions:

[0006] A magnetic induction intensity quantitative detection circuit comprises a capacitor CT16, a capacitor CT25, a resistor RT63 and a detection chip HT10. A signal connected to one end of a CPU is defined as Magnetic_Test. A GND pin of the detection chip HT10 is grounded, an OUT pin is connected to a detection pin of Magnetic_Test, and a VDD pin is connected to a power supply DVDD. One end of the capacitor CT16 is grounded GND, and the other end is connected to the detection pin of Magnetic_Test. One end of the capacitor CT25 is connected to the power supply DVDD, and the other end is grounded GND. One end of the resistor RT63 is connected to the power supply DVDD, and the other end is connected to the VDD pin of the detection chip HT10.

[0007] Preferably, the capacitor CT16 and the capacitor CT25 are chip capacitors, and the resistor RT63 is a chip resistor.

[0008] Preferably, the detection chip HT10 is a magnetic induction intensity detection chip.

[0009] Based on the above scheme, the models of the magnetic induction intensity detection chips include HT9101, HT9102, HT9103, and HT9105. The sensitivities of the above four chips are 1.0mV / Gs, 1.6mV / Gs, 2.15mV / Gs, and 3.15mV / Gs, respectively.

[0010] Preferably, the supply voltage of the power source DVDD is 3V-5V.

[0011] The beneficial effects of the utility model are as follows: the magnetic induction intensity is quantitatively detected by detecting the output voltage, and then the magnetic field interference intensity to which the electric meter is subjected is analyzed, effectively preventing the magnetic induction intensity from being too large and affecting the function of the electric meter; it has high sensitivity, strong anti-interference ability, and can select appropriate detection sensitivity according to needs; it has a simple circuit structure, low cost, and strong adaptability and practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 : Schematic diagram of the circuit of the utility model;

[0013] Figure 2 : Functional block diagram of the utility model detection chip HT10;

[0014] Figure 3 : Detection flow chart of the utility model;

[0015] Figure 4 : Schematic diagram of different sensitivity selection of the chip of the utility model;

[0016] Figure 5 : The relationship diagram of the output voltage of the utility model with the change of magnetic field strength;

[0017] Figure 6 : The relationship diagram of static voltage of the utility model with input voltage;

[0018] Figure 7 : The utility model static voltage and temperature change relationship diagram. DETAILED DESCRIPTION

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0020] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0022] like Figure 1As shown, a quantitative detection circuit for magnetic induction intensity includes capacitor CT16, capacitor CT25, resistor RT63 and detection chip HT10. The signal connected to one end of the CPU is defined as Magnetic_Test. The magnetic induction signal is detected and fed back by the CPU. The GND pin of the detection chip HT10 is grounded, the OUT pin is connected to the detection pin of Magnetic_Test, and the VDD pin is connected to the power supply DVDD. One end of the capacitor CT16 is connected to the ground GND, and the other end is connected to the detection pin of Magnetic_Test. One end of the capacitor CT25 is connected to the power supply DVDD, and the other end is connected to the ground GND. One end of the resistor RT63 is connected to the power supply DVDD, and the other end is connected to the VDD pin of the detection chip HT10. The capacitor CT16 and the capacitor CT25 are chip capacitors, the resistor RT63 is a chip resistor, and the resistor RT63 is a pull-up resistor. The detection chip HT10 is a magnetic induction intensity detection chip. Figure 2 This is the functional block diagram of the chip.

[0023] The models of the magnetic induction intensity detection chips include HT9101, HT9102, HT9103, and HT9105. The sensitivities of the above four chips are 1.0mV / Gs, 1.6mV / Gs, 2.15mV / Gs, and 3.15mV / Gs, respectively. Figure 4 As shown in the figure, the sensitivity of magnetic induction intensity is different, and the ability of the magnetic core detection chip to sense the strength of the magnetic field will be different. Different sensitivities can be selected according to the specific sensor model, accuracy requirements, use environment, detection requirements and other conditions to achieve the maximum output voltage swing, such as Figure 5 shown.

[0024] The CPU detects whether there is a magnetic field. When there is no magnetic field, the analog output voltage is 1 / 2 of the input voltage VDD, and the power supply voltage of the power supply DVDD is 3V-5V. The static voltage VNULL is the output voltage value without magnetic field interference. The relationship between the static voltage and the input voltage VDD at room temperature is as follows: Figure 6 As shown in the figure, the relationship between the static voltage and temperature at different sensitivities is as follows: Figure 7 shown.

[0025] like Figure 3 As shown, during the quantitative detection process, the static voltage value of the point is first analyzed based on the temperature and input voltage in the detection environment. If the output voltage is less than the static voltage, it is determined that there is no magnetic field interference in the detection environment. If the output voltage is greater than the static voltage, it is considered that there is magnetic field interference in the detection environment. Then, the magnetic field strength is quantitatively analyzed based on the chip sensitivity and the output voltage.

[0026] The present invention is described above by way of examples, but the present invention is not limited to the above specific embodiments, and any changes or modifications based on the present invention belong to the scope of protection required by the present invention.

Claims

1. A magnetic induction intensity quantitative detection circuit, characterized in that: It includes capacitor CT16, capacitor CT25, resistor RT63 and detection chip HT10, and defines the signal connected to one end of the CPU as Magnetic_Test. The GND pin of the detection chip HT10 is grounded, the OUT pin is connected to the detection pin of Magnetic_Test, and the VDD pin is connected to the power supply DVDD. One end of the capacitor CT16 is grounded GND, and the other end is connected to the detection pin of Magnetic_Test. One end of the capacitor CT25 is connected to the power supply DVDD, and the other end is grounded GND. One end of the resistor RT63 is connected to the power supply DVDD, and the other end is connected to the VDD pin of the detection chip HT10.

2. A magnetic induction intensity quantitative detection circuit according to claim 1, characterized in that: The capacitor CT16 and the capacitor CT25 are chip capacitors, and the resistor RT63 is a chip resistor.

3. A magnetic induction intensity quantitative detection circuit according to claim 1, characterized in that: The detection chip HT10 is a magnetic induction intensity detection chip.

4. A magnetic induction intensity quantitative detection circuit according to claim 3, characterized in that: The models of the magnetic induction intensity detection chips include HT9101, HT9102, HT9103, and HT9105. The sensitivities of the above four chips are 1.0mV / Gs, 1.6mV / Gs, 2.15mV / Gs, and 3.15mV / Gs, respectively.

5. A magnetic induction intensity quantitative detection circuit according to claim 1, characterized in that: The supply voltage of the power supply DVDD is 3V-5V.

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