Arcing detection device based on closed-loop Hall principle and detection method thereof

Abstract

The invention relates to the technical field of current detection, in particular to an arc discharge detection device based on a closed-loop Hall principle and a detection method thereof. The device comprises a Hall element, a compensating coil, a sampling resistor, a capacitor, an operational amplifier AP1, an operational amplifier AP2, an operational amplifier AP3 and a switch control module. The detection method comprises the following steps: transmitting a primary side current waveform by using the compensation coil, inducing arc discharge high-frequency characteristic current, carrying out signal processing through the sampling resistor and the capacitor, and finally outputting a detection signal through the operational amplifier AP3. Compared with the prior art, the arc discharge detection device has high current detection precision and strong anti-interference capability, and the accuracy and reliability of direct current arc discharge detection are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of current detection, and more specifically, to an arc detection device and a detection method thereof based on a closed-loop Hall principle. Background Art

[0002] In the field of current detection technology, especially DC arc detection, traditional current sensor solutions have obvious limitations. These solutions are usually unable to directly detect DC arcing, and require additional dedicated arc detection sensors to achieve this function. However, the existing technology combination, namely open-loop Hall current detection plus arc detection sensors, not only has low current measurement accuracy, but also poor anti-interference ability. Especially within the full temperature range, the accuracy deviation of current measurement is large, which limits the use of these technologies in application scenarios requiring high precision and high reliability.

[0003] Specifically, in DC current detection, open-loop Hall current sensors are difficult to achieve high-precision measurements due to the limitations of their working principles, especially at high frequencies, where their performance will further deteriorate. In addition, open-loop Hall sensors are not ideal in terms of anti-interference and are easily affected by external electromagnetic interference, resulting in inaccurate measurement results. These problems are particularly prominent in industrial automation, power system monitoring, and other occasions that require precise current detection, because these occasions have strict requirements on the accuracy and reliability of current detection. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an arc detection technology superimposed on closed-loop Hall current detection, which has high current detection accuracy and strong anti-interference ability of arc detection.

[0005] To achieve the above object, the present invention provides the following technical solutions: An arc detection device based on a closed-loop Hall principle comprises a Hall element, a compensation coil, a sampling resistor, a capacitor, and an operational amplifier AP3, wherein the Hall element is used to detect changes in a magnetic field and convert these changes into electrical signals; the compensation coil interacts with a primary current and is used to compensate for the magnetic field; the sampling resistor is used to sample a high-frequency characteristic current during DC arcing; the capacitor is connected in series with the sampling resistor and is used to present a low impedance at a high frequency; the operational amplifier AP3 is connected with the capacitor and the sampling resistor and is used for signal processing and outputting a detection signal.

[0006] Furthermore, the detection device also includes an operational amplifier AP1 and an operational amplifier AP2. The operational amplifier AP1 is used to drive the compensation current of the compensation coil and control the direction of the compensation current, so as to realize the detection of AC and DC current.

[0007] Operational amplifier AP2 is used to output a voltage value corresponding to the magnitude of the primary current by collecting the voltage on the sampling resistor, thereby ensuring that the product has the ability to detect the magnitude of the current.

[0008] Furthermore, the detection device also includes a switch control module, which includes MOS tube Q1, MOS tube Q2, MOS tube Q3 and MOS tube Q4. The current detection and / or DC arc detection can be realized by switching each MOS tube switch, or the two functions can work together to output signals at the same time.

[0009] A detection method for an arc detection device based on a closed-loop Hall principle, characterized in that it comprises the following steps: S1, using the compensation coil of the closed-loop Hall to transmit the primary current waveform; S2, when DC arcing occurs, the high-frequency characteristic current of arcing is induced by the compensation coil and flows through the sampling resistor; S3, connect a capacitor in series with the sampling resistor, the capacitor presents low impedance at high frequency; S4, perform signal processing through operational amplifier AP3 and output a detection signal.

[0010] By adopting the above technical solution, the beneficial effects of the present invention are: High-precision detection: Utilizing the closed-loop Hall principle, the present invention can accurately detect the primary current waveform, especially under high-frequency conditions, the compensation coil can transmit the current waveform well, thereby improving the accuracy of current detection.

[0011] Strong anti-interference ability: By connecting a capacitor in series with the sampling resistor, the present invention presents low impedance at high frequencies, effectively filters out the DC component, and significantly enhances the anti-interference ability of arc detection.

[0012] Wide temperature range applicability: The detection device of the present invention can maintain high current measurement accuracy in the entire temperature range, reducing the measurement deviation caused by temperature changes.

[0013] Integrated design: The present invention integrates the Hall element, compensation coil, sampling resistor, capacitor and operational amplifier into one, realizes the integration of arc detection, and is easy to install and use. Enhanced safety: Through accurate arc detection, the present invention can promptly identify and respond to arc faults, improving the safety of the circuit.

[0014] Simplified circuit design: The present invention simplifies circuit design and reduces design complexity, while improving system stability and reliability through the coordinated operation of operational amplifiers AP1, AP2, and AP3.

[0015] Cost-effectiveness: The present invention improves performance while reducing costs through optimized design, making the product more competitive in the market.

[0016] Easy to maintain and upgrade: The modular design of the present invention makes maintenance and upgrading more convenient, which is conducive to the long-term development and iteration of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a principle block diagram of a detection device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0020] like Figure 1 As shown, an arc detection device based on the closed-loop Hall principle includes a Hall element, a compensation coil, a sampling resistor R1, a capacitor C1, a switch module, an operational amplifier AP1, an operational amplifier AP2, and an operational amplifier AP3. The Hall element is used to detect changes in the magnetic field and convert these changes into electrical signals; the compensation coil interacts with the primary current and is used to compensate the magnetic field; the sampling resistor is used to sample the high-frequency characteristic current during DC arcing; the capacitor is connected in series with the sampling resistor to present low impedance at high frequencies; the operational amplifier AP3 is connected to the capacitor and the sampling resistor and is used for signal processing and outputting detection signals; the switch module includes MOS tubes Q1, MOS tubes Q2, MOS tubes Q3 and MOS tubes Q4.

[0021] The Hall element is connected to the input end of the operational amplifier AP1, one output end of the operational amplifier AP1 is connected to the gate of the MOS tube Q1 and the gate of the MOS tube Q2, the other output end of the operational amplifier AP1 is connected to the gate of the MOS tube Q3 and the gate of the MOS tube Q4, the source of the MOS tube Q1 is connected to the source of the MOS tube Q3, one end of the compensation coil is connected to the drain of the MOS tube Q1 and the drain of the MOS tube Q2, the other end of the compensation coil is connected to the sampling resistor R1, the other end of the sampling resistor R1 is connected to the drain of the MOS tube Q3, the drain of the MOS tube Q4, the operational amplifier AP1, and the sampling resistor R2. The MOS tube Q2 is connected to an input end of the operational amplifier AP2, the source of the MOS tube Q2 is connected to the source of the MOS tube Q4 and is grounded, one end of the capacitor C1 is connected to the other end of the compensation coil, one end of the sampling resistor R1, and the other input end of the operational amplifier AP2, the other end of the capacitor C1 is connected to an input end of the operational amplifier AP3, the other input end of the operational amplifier AP3 is grounded, an output end of the operational amplifier AP2 outputs a voltage signal Vout, the other output end of the operational amplifier AP2 outputs a voltage signal Vref, and the output end of the operational amplifier AP3 outputs a detection signal AFCI.

[0022] Arc detection method based on closed-loop Hall current sensor: The compensation coil using closed-loop Hall can transmit the primary current waveform well under high frequency conditions. When DC arcing occurs, the high-frequency characteristic current of arcing is sensed by the compensation coil and flows through the sampling resistor R1. The C1 capacitor is connected in series to the sampling resistor R1. The C1 capacitor presents low impedance at high frequency. The signal is processed by the AP3 operational amplifier and the AFCI signal is output.

[0023] Based on the detection of DC arc under the primary DC current, the closed-loop Hall zero flux principle is used to collect the high-frequency current signal on the R1 sampling resistor. The DC current signal cannot pass through the C1 capacitor. When the frequency point is above 10kHz, the Hall element cannot compensate for the primary high-frequency current and needs to be sensed and output through a compensation coil.

[0024] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. An arc detection device based on a closed-loop Hall principle, characterized in that: include Hall elements, which detect changes in magnetic fields and convert those changes into electrical signals; a compensation coil, which interacts with the primary current and is used to compensate the magnetic field; Sampling resistor, used to sample the high-frequency characteristic current during DC arcing; A capacitor, connected in series with the sampling resistor, is used to present low impedance at high frequencies; The operational amplifier AP3 is connected to the capacitor and the sampling resistor and is used for signal processing and outputting a detection signal.

2. The arc detection device based on the closed-loop Hall principle according to claim 1, characterized in that: The detection device also includes an operational amplifier AP1 and an operational amplifier AP2. Operational amplifier AP1 is used to drive the compensation current of the compensation coil and control the direction of the compensation current. The operational amplifier AP2 is used to output a voltage value corresponding to the magnitude of the primary current by collecting the voltage on the sampling resistor.

3. The arc detection device based on the closed-loop Hall principle according to claim 2, characterized in that: The detection device also includes a switch control module, which includes MOS transistors Q1, Q2, Q3 and Q4. Current detection or DC arc detection is achieved by switching MOS transistors Q1, Q2, Q3 and Q4.

4. The detection method of the arc detection device based on the closed-loop Hall principle according to claim 3 is characterized in that: Included steps S1, using the compensation coil of the closed-loop Hall to transmit the primary current waveform; S2, when DC arcing occurs, the high-frequency characteristic current of arcing is induced by the compensation coil and flows through the sampling resistor; S3, connect a capacitor in series with the sampling resistor, the capacitor presents low impedance at high frequency; S4, perform signal processing through operational amplifier AP3 and output a detection signal.

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