Sampling circuit, interference suppression equipment and energy storage power supply thereof

Abstract

The embodiment of the utility model discloses a sampling circuit, interference suppression equipment and an energy storage power supply thereof. The sampling circuit comprises at least one magnetic ring body; the conductive circuits penetrate through the magnetic ring body and are used for conducting alternating current output by the alternating current power supply; and the at least one sampling coil penetrates through the magnetic ring body, forms at least one circle and is used for sensing a high-frequency interference signal in the alternating current and outputting the high-frequency interference signal. Through the above mode, the hardware cost of the interference signal sampling circuit can be reduced, the size of the interference signal sampling circuit can be reduced, the requirements of a new energy automobile charging system for a stable, safe and interference-free power supply can be met, the charging efficiency can be improved, the charging safety can be guaranteed, and the service life of a battery can be prolonged.

Description

Technical Field

[0001] This utility model relates to the field of interference signal suppression, and in particular to a sampling circuit, interference suppression device and its energy storage power supply. Background Technology

[0002] In recent years, with the widespread adoption of new energy vehicles, on-board electronic circuit systems have become increasingly complex, leading to ever-increasing demands for vehicle charging safety. The need for high-quality, interference-free, and stable power supplies in new energy vehicles is becoming increasingly urgent, placing higher requirements on the power quality of charging systems.

[0003] However, AC power supplies themselves contain various parasitic interference signals, primarily manifested as high-frequency interference waveforms in the range of 150kHz to 30MHz. This interference not only affects charging stability but can also adversely impact vehicle electronic systems and even threaten charging safety. Effectively removing these interference signals from AC power supplies has always been a challenging technical issue for power supply and charging engineers.

[0004] Traditional solutions typically employ various circuits to remove interference waveforms, such as high-current coils and capacitor decoupling. However, these solutions generally suffer from high cost and large size, making it difficult to meet the demands of new energy vehicles for lightweight, miniaturized, and low-cost designs. These drawbacks are particularly pronounced in space-constrained applications such as on-board charging systems. Utility Model Content

[0005] The main technical problem solved by this utility model embodiment is to provide a solution that can overcome at least some of the defects of existing interference signal sampling circuits.

[0006] In a first aspect, the present invention provides a sampling circuit comprising: at least one magnetic ring; at least one pair of conductive lines passing through the magnetic ring for conducting alternating current output by an alternating current power supply; and at least one sampling coil passing through the magnetic ring and forming at least one loop for sensing high-frequency interference signals in the alternating current and outputting the high-frequency interference signals.

[0007] Optionally, the conductive circuit includes a first conductive circuit and a second conductive circuit, wherein the two ends of the first conductive circuit are a first input terminal and a first output terminal, respectively, and the two ends of the second conductive circuit are a second input terminal and a second output terminal, respectively.

[0008] Optionally, the two ends of the sampling coil are a first sampling end and a second sampling end, respectively, for outputting the high-frequency interference signal.

[0009] Optionally, the sampling circuit further includes resistors and capacitors, which, together with the sampling coil, form a filter circuit for filtering the high-frequency interference signal.

[0010] Optionally, the sampling circuit further includes a fixed base for supporting the magnetic ring, the conductive lines, and the sampling coil; and epoxy resin fixing points for fixing the conductive lines and the sampling coil to the fixed base.

[0011] Optionally, the diameter of the sampling coil is smaller than the diameter of the conductive line.

[0012] Optionally, the conductive line is a copper wire; the magnetic ring is made of ferrite material.

[0013] Secondly, this utility model also provides an interference suppression device, comprising: a sampling circuit as described in the first aspect; a signal processing circuit connected to the sampling coil for receiving and processing the high-frequency interference signal; and an interference suppression circuit connected to the signal processing circuit and an AC power supply for suppressing interference in the AC power supply based on the processed high-frequency interference signal.

[0014] Optionally, the signal processing circuit and the interference suppression circuit together form a feedback loop to dynamically suppress high-frequency interference in the AC power supply.

[0015] Secondly, this utility model also provides an energy storage power supply, including: the interference suppression device as described in the third aspect.

[0016] The beneficial effects of this utility model embodiment are: unlike the prior art, this utility model embodiment can reduce the hardware cost and size of the interference signal sampling circuit, so as to meet the requirements of new energy vehicle charging systems for a stable, safe, and interference-free power supply, thereby improving charging efficiency, ensuring charging safety, and extending battery life. Attached Figure Description

[0017] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0018] Figure 1 This is a front view of a sampling circuit provided in an embodiment of this application.

[0019] Figure 2 This is a side view of a sampling circuit provided in an embodiment of this application;

[0020] Figure 3 This is a schematic diagram of the structure of an interference suppression device provided in an embodiment of this application. Detailed Implementation

[0021] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this specification are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0023] This application provides a sampling circuit, referring to... Figure 1 and Figure 2 , Figure 1 This is a schematic diagram of the front structure of the sampling circuit. Figure 2 This is a side view of the sampling circuit. The sampling circuit includes a magnetic ring 100, conductive lines (including a first conductive line 210 and a second conductive line 220), a sampling coil 300, epoxy resin fixing points 400, and a fixing base 500.

[0024] The magnetic ring 100 is made of ferrite material and has a ring structure to form a closed magnetic circuit. Ferrite material has excellent high-frequency characteristics and can effectively sense high-frequency interference signals. The inner diameter of the magnetic ring 100 is designed to accommodate both the conductive line and the sampling coil, while the outer diameter is determined according to the actual application scenario, typically between 10mm and 30mm. The thickness of the magnetic ring 100 is generally 5mm to 15mm to ensure sufficient magnetic flux.

[0025] The conductive circuit includes a first conductive circuit 210 and a second conductive circuit 220, both made of copper wire. The first conductive circuit 210 has a first input terminal and a first output terminal at its two ends, respectively, while the second conductive circuit 220 has a second input terminal and a second output terminal at its two ends, respectively. The conductive circuits have a relatively thick wire diameter, typically 2.5mm ± 0.2mm, to ensure the passage of a large current and meet the requirements of AC power transmission. The conductive circuits pass through the central hole of the magnetic ring 100 to conduct the AC power output from the AC power supply. The main frequency of the AC power supply is 50Hz, but it also contains high-frequency interference signals in the range of 150kHz to 30MHz.

[0026] In this embodiment, the sampling coil 300 also passes through the central hole of the magnetic ring 100 and forms a loop around the magnetic ring 100. The two ends of the sampling coil 300 are a first sampling end and a second sampling end, respectively, used to output the induced high-frequency interference signal. The wire diameter of the sampling coil 300 is significantly smaller than that of the conductive line, typically 1.0 mm ± 0.2 mm, because the sampling coil 300 only needs to conduct a weak induced signal and does not need to carry a large current. The sampling coil 300 is typically made of insulated copper wire to ensure electrical isolation from the conductive line.

[0027] In other embodiments, the sampling coil 300 can be formed in multiple loops on the magnetic ring 100. Increasing the number of loops can improve induction efficiency and sensitivity, adapting to the sampling requirements of interference signals of different intensities. The number of loops can be flexibly adjusted according to the actual application scenario, generally ranging from 1 to 10 loops. The more loops, the stronger the induced signal, but at the same time, it will also increase the distributed capacitance and inductance of the coil, affecting the high-frequency characteristics.

[0028] The sampling circuit also includes resistors and capacitors (not shown in the figure) that, together with the sampling coil 300, form a filter circuit. The resistors are typically precision resistors with resistances ranging from 10Ω to 100Ω and an accuracy of ±1%, used for current limiting and impedance matching. The capacitors are typically ceramic or film capacitors with capacitances ranging from 0.1μF to 10μF and a voltage rating of at least 400V, used to filter out unwanted frequency components and optimize the quality of the sampled signal. The filter circuit is designed as a bandpass filter, with a passband range matched to the frequency range of high-frequency interference signals (150kHz to 30MHz).

[0029] The mounting base 500 supports the magnetic ring 100, conductive circuitry, and sampling coil 300. The mounting base 500 is typically made of engineering plastic materials (such as ABS or PC), providing good mechanical strength and insulation. The mounting base 500 has grooves for placing the magnetic ring 100 and channels for the conductive circuitry and sampling coil 300 to pass through. The design of the mounting base 500 ensures the stability of the sampling circuit structure, making it suitable for reliable operation in various working environments.

[0030] Epoxy resin fixing points 400 are used to firmly fix the conductive circuit and sampling coil 300 to the fixing base 500, preventing loosening and displacement. Epoxy resin fixing points 400 use a two-component epoxy resin adhesive, which has high bonding strength and good insulation properties. Figure 1 As shown, the epoxy resin fixing point 400 is located in the top area of ​​the magnetic ring 100, playing a key fixing role and ensuring that the conductive line and the sampling coil 300 will not be relatively displaced due to vibration or temperature changes during use.

[0031] In terms of operating principle, when AC power flows through the first conductive line 210 and the second conductive line 220, it not only conducts 50Hz AC current but also high-frequency interference signals in the range of 150kHz to 30MHz. As the AC current flows through the conductive lines, it generates an alternating magnetic field inside the magnetic ring 100. Due to the effect of the magnetic field on the high-frequency signals, the high-frequency interference signals induce corresponding voltage and current signals in the sampling coil 300 through electromagnetic induction. The sampling coil 300 outputs the induced high-frequency interference signals through the first sampling terminal and the second sampling terminal.

[0032] The output high-frequency interference signal is then preliminarily processed by a filtering circuit. This circuit attenuates unwanted frequency components while retaining useful interference signal characteristics. Resistors in the filtering circuit serve to limit current and match impedance, while capacitors are used for filtering and signal coupling. The high-frequency interference signal processed by the filtering circuit is cleaner and has a higher signal-to-noise ratio, which is beneficial for subsequent signal processing and interference suppression.

[0033] The main technical feature of the sampling circuit lies in the ingenious combination of the magnetic ring 100 and the sampling coil 300, which enables effective sampling of high-frequency interference signals in AC power supplies while maintaining electrical isolation from the main circuit. The sampling circuit has a simple structure, low cost, and compact size, making it easy to integrate into various power supply systems. Another feature of the sampling circuit is the use of a single-turn sampling coil 300 design. Compared to multi-turn designs, the single-turn design provides a wider frequency response range, covering the high-frequency interference signal band from 150kHz to 30MHz.

[0034] The ferrite magnetic ring 100 in the sampling circuit has high permeability, which effectively enhances the magnetic field strength in the high-frequency band and improves sampling sensitivity. The conductive circuit uses large-section copper wire, which can carry a large current and is suitable for various AC power systems. The difference in wire diameter between the sampling coil 300 and the conductive circuit ensures sampling sensitivity while avoiding interference with the main circuit.

[0035] The design of the mounting base 500 and the epoxy resin fixing points 400 together ensures the stability and reliability of the sampling circuit structure, making it suitable for long-term operation in harsh environments such as vibration and temperature changes. The bonding performance and insulation properties of the epoxy resin fixing points 400 play a crucial role in the entire sampling circuit, ensuring the relative positional stability of each component and providing additional insulation protection.

[0036] Unlike existing technologies, this invention can reduce the hardware cost and size of the interference signal sampling circuit.

[0037] Based on the sampling circuit described above, this application also provides an interference suppression device, referring to... Figure 3 , Figure 3 This is a schematic diagram of an interference suppression device. The interference suppression device includes a sampling circuit 10, a signal processing circuit 20, an interference suppression circuit 30, and an AC power supply 40, forming a complete interference suppression system.

[0038] The sampling circuit 10 has the same structure as the sampling circuit described in the previous embodiment, including a magnetic ring, conductive lines, a sampling coil, epoxy resin fixing points, and a fixing base. The main function of the sampling circuit 10 is to induce high-frequency interference signals from the AC power supply 40 and output the induced high-frequency interference signals through the first and second sampling terminals of the sampling coil. The sampling circuit 10 is directly connected to the AC power supply 40, and the AC power from the AC power supply 40 is input and output through the conductive lines of the sampling circuit 10. When the AC current passes through the conductive lines, the high-frequency interference signals (frequency range of 150kHz to 30MHz) in the AC power supply will induce corresponding voltage and current signals in the sampling coil.

[0039] The signal processing circuit 20 is connected to the sampling coil of the sampling circuit 10 and is used to receive and process the high-frequency interference signal output by the sampling coil. The signal processing circuit 20 mainly consists of a signal amplification unit, a signal filtering unit, a signal phase adjustment unit, and a signal amplitude adjustment unit.

[0040] The signal amplification unit is constructed using a low-noise operational amplifier with an adjustable gain range of 20dB to 60dB, used to amplify the weak signal output from the sampling coil to an appropriate level. The signal amplification unit employs a two-stage amplifier circuit: the first stage is a low-noise preamplifier, and the second stage is a variable gain amplifier, capable of automatically adjusting the gain according to the strength of the interference signal to avoid signal overload or insufficient gain.

[0041] The signal filtering unit consists of multiple filter stages, including a high-pass filter, a band-pass filter, and a low-pass filter. The high-pass filter has a cutoff frequency of approximately 100kHz to filter out power frequency and harmonic components; the band-pass filter has a passband range of 150kHz to 30MHz to match the frequency range of high-frequency interference signals; and the low-pass filter has a cutoff frequency of approximately 35MHz to suppress high-frequency noise. The filtering characteristics of the signal filtering unit can be optimized by adjusting the resistor and capacitor values ​​to adapt to the interference characteristics of different application scenarios.

[0042] The signal phase adjustment unit is used to adjust the phase of the processed signal to ensure that the interference suppression signal is out of phase with the original interference signal. Phase adjustment is achieved using an all-pass filter, allowing for precise phase adjustment within the range of 0° to 360° with an accuracy better than ±5°. The accuracy of phase adjustment directly affects the interference suppression effect; the smaller the phase deviation, the better the suppression effect.

[0043] The signal amplitude adjustment unit is used to adjust the amplitude of the processed signal to ensure that the amplitude of the suppressed signal is comparable to that of the original interference signal. Amplitude adjustment is achieved using a programmable gain amplifier, with a gain adjustment range of 0.1 to 10 times and a resolution better than 0.1 dB. The amplitude adjustment unit also features automatic gain control, which automatically adjusts the gain according to changes in the intensity of the interference signal to maintain optimal suppression.

[0044] Interference suppression circuit 30 is connected to signal processing circuit 20 and AC power supply 40, and is used to suppress interference in AC power supply 40 based on the processed high-frequency interference signal. Interference suppression circuit 30 mainly consists of a drive amplification unit, a power output unit, and a coupling unit.

[0045] The driver amplifier unit is constructed using a wideband operational amplifier with a bandwidth of no less than 50MHz and an output swing of no less than ±10V, used to drive the subsequent power output unit. The driver amplifier unit features low distortion characteristics, ensuring the fidelity of the drive signal and reducing the generation of additional harmonics.

[0046] The power output unit is constructed using a Class AB power amplifier, with an output power range of 10W to 50W, depending on the interference intensity of the actual application. The power output unit employs a feedback stabilization design, exhibiting excellent linearity and stability, accurately reproducing the signal waveform output by the signal processing circuit 20, while also withstanding prolonged full-load operation.

[0047] The coupling unit is used to couple the suppression signal generated by the power output unit back to the AC power supply 40, thus completing the interference suppression. The coupling unit can use either transformer coupling or capacitor coupling. Transformer coupling is suitable for low-frequency interference, while capacitor coupling is suitable for high-frequency interference. In practical applications, a hybrid coupling method is usually used to achieve interference suppression across the entire frequency band. Impedance matching of the coupling unit is crucial; good impedance matching maximizes energy transfer efficiency and improves the suppression effect.

[0048] The signal processing circuit 20 and the interference suppression circuit 30 together form a feedback loop to dynamically suppress high-frequency interference in the AC power supply 40. The working principle of the feedback loop is as follows: the sampling circuit 10 senses the high-frequency interference signal in the AC power supply 40; the signal processing circuit 20 amplifies, filters, adjusts the phase and amplitude of the sensed signal to generate a suppression signal with the same amplitude but opposite phase to the original interference signal; the interference suppression circuit 30 amplifies the suppression signal and couples it back to the AC power supply 40, canceling the original interference signal through the principle of cancellation.

[0049] The feedback loop has adaptive characteristics, automatically adjusting the parameters of the suppression signal according to changes in the interference signal to maintain optimal suppression performance. The loop gain, phase margin, and stability of the feedback loop are carefully designed to ensure stable and reliable operation of the system under various operating conditions, without problems such as self-excited oscillation.

[0050] The core technological advantage of interference suppression equipment lies in its use of active suppression technology, which differs from traditional passive filtering methods. Active suppression technology can specifically suppress interference signals at specific frequencies, and its suppression effect is significantly better than that of passive filtering methods. In particular, the adaptive capability of active suppression technology can maintain a stable suppression effect for changing interference signals.

[0051] Another technological advantage of interference suppression equipment is its compact structure and low cost. Compared to traditional passive filtering solutions that require large coils and large-capacity capacitors, active suppression technology has smaller electronic circuits and lower material costs, making it particularly suitable for space-constrained applications.

[0052] Based on the interference suppression device provided in the above embodiments, this application also provides an energy storage power supply, which includes the interference suppression device provided in the above embodiments.

[0053] It should be noted that while the preferred embodiments of this utility model are provided in the specification and accompanying drawings, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are not intended to impose additional limitations on the content of this utility model; their purpose is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Furthermore, the above-described technical features can be combined with each other to form various embodiments not listed above, all of which are considered to be within the scope of this utility model specification. Moreover, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A sampling circuit, characterized by comprising: The sampling circuit comprises: at least one magnetic ring body; at least one pair of conductive lines passing through the magnetic ring body for conducting alternating current outputted by an alternating current power supply; and at least one sampling coil passing through the magnetic ring body and forming at least one loop for sensing high-frequency interference signals in the alternating current and outputting the high-frequency interference signals.

2. The circuit of claim 1, wherein, The conductive lines comprise a first conductive line and a second conductive line, two ends of the first conductive line being a first input end and a first output end respectively, and two ends of the second conductive line being a second input end and a second output end respectively.

3. The circuit of claim 1, wherein, Two ends of the sampling coil are a first sampling end and a second sampling end respectively for outputting the high-frequency interference signals.

4. The circuit of claim 1, wherein, Further comprising resistance and capacitance elements which combine with the sampling coil to form a filter circuit for filtering the high-frequency interference signals.

5. The circuit of claim 1, wherein, Further comprising a fixed base for supporting the magnetic ring body, the conductive lines and the sampling coil; and an epoxy resin fixing point for fixing the conductive lines and the sampling coil on the fixed base.

6. The circuit of claim 1, wherein, The wire diameter of the sampling coil is smaller than the wire diameter of the conductive lines.

7. The circuit of claim 1, wherein, The conductive lines are copper wires and the magnetic ring body is made of ferrite material.

8. An interference suppressing device, characterized by The interference suppression device comprises: the sampling circuit according to any one of claims 1-7; a signal processing circuit connected to the sampling coil for receiving and processing the high-frequency interference signals; and an interference suppression circuit connected to the signal processing circuit and the alternating current power supply for suppressing interference in the alternating current power supply according to the processed high-frequency interference signals.

9. The apparatus of claim 8, wherein, The signal processing circuit and the interference suppression circuit together constitute a feedback loop for dynamically suppressing high-frequency interference in the alternating current power supply.

10. An energy storage power supply, characterized by, The interference suppression device comprises: the sampling circuit according to claim 8 or 9.

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