Arc detection frequency adjustable circuit

Abstract

The utility model discloses an arc detection frequency adjustable circuit, which belongs to the technical field of arc detection circuits, and comprises a frequency modulation circuit, the frequency modulation circuit comprises three band-pass filters which are connected in parallel, and the input end of the circuit is connected with a change-over switch in series, and the change-over switch is used for switching different band-pass filters to be connected into the circuit. The band-pass filter is used for filtering electric arcs to be detected and generating detection signals, the digital-to-analog converter is used for converting digital signals of the electric arcs of different grades into analog signals to serve as reference signals to participate in comparison, the electric arc comparator is used for comparing the detection signals with the reference signals, and the single chip microcomputer is used for processing comparison results of the electric arc comparator. The technical key points are as follows: three band-pass filters with different filtering frequencies are used for filtering detection signals with different detection frequency bandwidths so as to meet different detection requirements of manufacturers, and the pass frequency bands of the band-pass filters can be independently designed by the manufacturers according to own conditions, so that the detection circuit better meets the requirements of the manufacturers.

Description

Technical Field

[0001] The utility model relates to the technical field of arc detection circuits, in particular to an arc detection frequency adjustable circuit. Background Art

[0002] Arcing, or air discharge, occurs between the two conductors with the smallest distance between them in an electrical device. Arcing is random, with the higher the voltage and the smaller the distance, the greater the probability of occurrence. Arcing typically indicates poor high-voltage insulation, electrode gap, or other insulation issues within the DUT during AC and DC withstand voltage tests. These issues can cause temporary current or voltage spikes during AC and DC withstand voltage tests. Arcing can cause burns and irreversible damage to product materials if struck. Arcing cannot be precisely measured, so in the safety testing industry, qualitative comparisons are generally used, with severity classified into nine levels.

[0003] With the advancement of science and technology, the miniaturization of electronic components and the application of emerging high-bandwidth components, the bandwidth of arc detection frequency in safety instruments must also be increased. However, traditional arc detection circuits in safety instruments do not have the ability to adjust the arc detection frequency bandwidth. Manufacturers are unable to select the appropriate arc detection frequency bandwidth according to actual detection needs. In addition, under normal circumstances, the bandwidth used for arc detection frequency is generally 10kHz-30kHz, which cannot meet the demand for higher detection frequencies. Therefore, to address the above problems, a circuit with adjustable arc detection frequency is proposed. Utility Model Content

[0004] The technical problem to be solved by the present invention is to provide an arc detection frequency adjustable circuit, in which three band-pass filters with different filtering frequencies are provided, which can filter out detection signals with different detection frequency bandwidths to meet different detection requirements of manufacturers. The band-pass filter includes three bandwidth filters: low-frequency band-pass filter, medium-frequency band-pass filter and high-frequency band-pass filter, which can meet the detection requirements of higher frequencies. In addition, in the band-pass filter, the values ​​of low-pass capacitance, low-pass resistance, high-pass capacitance and high-pass resistance can be adjusted, and the pass frequency band of the band-pass filter can be freely adjusted, so that manufacturers can design a band-pass filter with a bandwidth that meets the requirements, so that the detection circuit is more in line with the needs of each manufacturer, and solves the technical problems in the prior art that traditional detection circuits do not have the ability to adjust the arc detection frequency bandwidth and are difficult to meet the requirements of higher detection frequencies.

[0005] The technical solution adopted by the embodiment of the present application to solve the technical problem is:

[0006] An arc detection frequency adjustable circuit includes a frequency modulation circuit, which includes three parallel bandpass filters, and a switching switch is connected in series at the circuit input end, which is used to switch different bandpass filters into the circuit. The bandpass filters are used to filter the arc to be detected and generate detection signals. A digital-to-analog converter is used to convert digital signals of arcs of different levels into analog signals as reference signals for comparison. An arc comparator is used to compare the detection signal with the reference signal. A single-chip microcomputer is used to process the comparison result of the arc comparator and determine the arc frequency. The three bandpass filters have different filtering frequencies.

[0007] Through the above-mentioned structural form, three band-pass filters with different filtering frequencies are used to filter out detection signals with different detection frequency bandwidths to meet the different detection requirements of manufacturers.

[0008] In a possible implementation, the three band-pass filters are a low-frequency band-pass filter, a medium-frequency band-pass filter, and a high-frequency band-pass filter.

[0009] Through the above-mentioned structural form, it is possible to use filters with three different detection frequency bandwidths to meet the detection requirements of different bandwidths and also meet the detection requirements of higher frequencies.

[0010] In a possible implementation, the pass frequency band of the low-frequency bandpass filter is 10 kHz-30 kHz, the pass frequency band of the intermediate-frequency bandpass filter is 10 kHz-100 kHz, and the pass frequency band of the high-frequency bandpass filter is 10 kHz-150 kHz.

[0011] Through the above-mentioned structural form, the frequency detection requirements of more common arcs can be met by using three bandpass filters with different bandwidths, among which the high-frequency bandpass filter can meet the detection requirements of higher frequencies.

[0012] In a possible implementation, the switch is a multi-speed switch, and each speed thereof is electrically connected to a corresponding bandpass filter.

[0013] Through the above-mentioned structural form, the switch can be operated to switch different gears, and then different band-pass filters can be connected to the detection circuit, so that the detection circuit can complete the detection of arcs with different frequency bandwidths.

[0014] In a possible implementation, the bandpass filter is formed by a low-pass filter and a high-pass filter connected in series, and a voltage follower is electrically connected in the series circuit.

[0015] Through the above-mentioned structural form, the low-pass filter and the high-pass filter can work in combination to complete the interception of electrical signals in a specific frequency band, and the voltage follower can eliminate the mutual interference of the cutoff frequencies of the low-pass filter and the high-pass filter when they are connected in series.

[0016] In a possible implementation, the low-pass filter is composed of a low-pass capacitor and a low-pass resistor, and the high-pass filter is composed of a high-pass capacitor and a high-pass resistor.

[0017] Through the above structure, the capacitor and the resistor can work together to form a filter.

[0018] In a possible implementation, when the values ​​of the low-pass capacitor, the low-pass resistor, the high-pass capacitor, and the high-pass resistor are adjusted, the pass frequency band of the band-pass filter may be changed accordingly.

[0019] Through the above-mentioned structural form, the pass frequency band of the bandpass filter is adjustable, allowing manufacturers to design a bandpass filter with a bandwidth that meets their needs, making the detection circuit more suitable for their own needs.

[0020] In summary, the present invention has the following beneficial technical effects:

[0021] By setting three band-pass filters with different filtering frequencies, it is possible to filter out detection signals with different detection frequency bandwidths to meet the different detection requirements of manufacturers. The band-pass filters include three bandwidth filters: low-frequency band-pass filter, medium-frequency band-pass filter and high-frequency band-pass filter, which can meet the detection requirements of higher frequencies.

[0022] In addition, in the band-pass filter, the values ​​of the low-pass capacitor, low-pass resistor, high-pass capacitor and high-pass resistor can be adjusted, and the pass frequency band of the band-pass filter can be freely adjusted, allowing manufacturers to design a band-pass filter with a bandwidth that meets their requirements, making the detection circuit more in line with the needs of each manufacturer. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0024] Figure 1 This is the principle diagram of the detection circuit of the utility model;

[0025] Figure 2 This is a schematic diagram of the bandpass filter circuit of the present utility model.

[0026] In the figure: K, switch; BPF, bandpass filter; BPF1, low-frequency bandpass filter; BPF2, intermediate-frequency bandpass filter; BPF3, high-frequency bandpass filter; B, arc comparator; DAC, digital-to-analog converter; MCU, microcontroller; C1, low-pass capacitor; C2, high-pass capacitor; R1, low-pass resistor; R2, high-pass resistor. DETAILED DESCRIPTION

[0027] The technical solution in the embodiments of the present application is to solve the problems of the above-mentioned background technology, and the overall idea is as follows:

[0028] like Figure 1 As shown, the present embodiment provides an arc detection frequency adjustable circuit, including a frequency modulation circuit, which includes three parallel bandpass filters BPF, and a switching switch K is connected in series at the circuit input end, which is used to switch different bandpass filters BPF to be connected to the circuit, the bandpass filter BPF is used to filter the arc to be detected and generate a detection signal, a digital-to-analog converter DAC, which is used to convert the digital signals of different levels of arc into analog signals as reference signals for comparison, an arc comparator B, which is used to compare the detection signal with the reference signal, and a single-chip microcomputer MCU, which is used to process the comparison result of the arc comparator B and determine the arc frequency, wherein the three bandpass filters BPF have different filtering frequencies. Through the above-mentioned structural form, the three bandpass filters BPF with different filtering frequencies are used to filter out detection signals with different detection frequency bandwidths to meet the different detection requirements of manufacturers.

[0029] Among them, the three bandpass filters BPF are respectively a low-frequency bandpass filter BPF1, a medium-frequency bandpass filter BPF2 and a high-frequency bandpass filter BPF3. Through the above-mentioned structural form, three filters with different detection frequency bandwidths can be used to meet the detection requirements of different bandwidths, and can also meet the detection requirements of higher frequencies. Specifically, the passing frequency band of the low-frequency bandpass filter BPF1 is 10kHz-30kHz, the passing frequency band of the medium-frequency bandpass filter BPF2 is 10kHz-100kHz, and the passing frequency band of the high-frequency bandpass filter BPF3 is 10kHz-150kHz. The bandpass filters BPF with the above three bandwidths can meet the frequency detection requirements of more common arcs, among which the high-frequency bandpass filter BPF3 can meet the detection requirements of higher frequencies.

[0030] In addition, the switching switch K is a multi-speed switch, and each gear is electrically connected to one of the corresponding bandpass filters BPF. Through the above-mentioned structural form, the switching switch K can be operated to switch different gears, and then different bandpass filters BPF can be connected to the detection circuit, so that the detection circuit can complete the detection of arcs with different frequency bandwidths.

[0031] like Figure 2As shown, the band-pass filter BPF is composed of a low-pass filter and a high-pass filter in series, and a voltage follower is electrically connected in the series circuit. Through the above structure, the low-pass filter and the high-pass filter can work in combination to complete the interception of electrical signals in a specific frequency band, and the voltage follower can eliminate the mutual interference of the cutoff frequencies of the low-pass filter and the high-pass filter when they are connected in series.

[0032] Among them, the low-pass filter is composed of a low-pass capacitor C1 and a low-pass resistor R1, and the high-pass filter is composed of a high-pass capacitor C2 and a high-pass resistor R2. When the values ​​of the low-pass capacitor C1, the low-pass resistor R1, the high-pass capacitor C2 and the high-pass resistor R2 are adjusted, the pass frequency band of the band-pass filter BPF can be changed accordingly. Through the above structure, the pass frequency band of the band-pass filter BPF is adjustable, so that manufacturers can design a band-pass filter BPF with a bandwidth that meets their needs, so that the detection circuit can better meet their own needs.

[0033] The use principle and use process of this utility model:

[0034] When in use, the frequency of the arc is estimated based on experience, and the appropriate band-pass filter BPF is connected to the circuit by switching the switch K. The band-pass filter BPF is used to filter the arc to be detected and generate a detection signal. At the same time, the digital-to-analog converter DAC converts the digital signals of arcs of different levels into analog signals, which are used as reference signals for comparison. The detection signal and the reference signal are synchronously input into the arc comparator B for comparison. Finally, the microcontroller MCU processes the comparison results of the arc comparator B to determine the arc frequency.

[0035] By setting three band-pass filters BPF with different filtering frequencies, detection signals with different detection frequency bandwidths can be filtered out to meet the different detection requirements of manufacturers. The band-pass filter BPF includes three bandwidth filters: low-frequency band-pass filter BPF1, medium-frequency band-pass filter BPF2 and high-frequency band-pass filter BPF3, which can meet the detection requirements of higher frequencies.

[0036] In addition, in the band-pass filter BPF, the values ​​of the low-pass capacitor C1, low-pass resistor R1, high-pass capacitor C2 and high-pass resistor R2 can be adjusted, and the pass frequency band of the band-pass filter BPF can be freely adjusted, allowing manufacturers to design a band-pass filter BPF with a bandwidth that meets their requirements, making the detection circuit more in line with the needs of each manufacturer.

[0037] Finally, it should be noted that the above embodiments are merely examples for the purpose of illustrating the present invention and are not intended to limit the embodiments. Those skilled in the art will readily appreciate that other variations or modifications based on the above description are possible. It is not necessary and impossible to provide an exhaustive list of all possible embodiments. However, any obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. An arc detection frequency adjustable circuit, characterized in that: include: A frequency modulation circuit includes three parallel band-pass filters (BPFs), and a switch (K) is connected in series at the circuit input end for switching different band-pass filters (BPFs) into the circuit. The band-pass filters (BPFs) are used to filter the arc to be detected and generate a detection signal. A digital-to-analog converter (DAC) is used to convert the digital signals of arcs of different levels into analog signals, which serve as reference signals for comparison; an arc comparator (B) for comparing the detection signal with a reference signal; A single chip microcomputer (MCU) is used to process the comparison result of the arc comparator (B) and determine the arc frequency; Among them, the three band-pass filters (BPFs) filter frequencies differently from each other.

2. The arc detection frequency adjustable circuit according to claim 1, characterized in that: The three band pass filters (BPFs) are a low frequency band pass filter (BPF1), a mid frequency band pass filter (BPF2) and a high frequency band pass filter (BPF3).

3. The arc detection frequency adjustable circuit according to claim 2, characterized in that: The pass frequency band of the low-frequency bandpass filter (BPF1) is 10kHz-30kHz, the pass frequency band of the intermediate-frequency bandpass filter (BPF2) is 10kHz-100kHz, and the pass frequency band of the high-frequency bandpass filter (BPF3) is 10kHz-150kHz.

4. The arc detection frequency adjustable circuit according to claim 1, characterized in that: The switch (K) is a multi-speed switch, and each speed thereof is electrically connected to a corresponding band-pass filter (BPF).

5. The arc detection frequency adjustable circuit according to claim 1, characterized in that: The band pass filter (BPF) is composed of a low pass filter and a high pass filter connected in series, and a voltage follower is electrically connected in the series circuit.

6. The arc detection frequency adjustable circuit according to claim 5, characterized in that: The low-pass filter is composed of a low-pass capacitor (C1) and a low-pass resistor (R1), and the high-pass filter is composed of a high-pass capacitor (C2) and a high-pass resistor (R2).

7. The arc detection frequency adjustable circuit according to claim 6, characterized in that: When the values ​​of the low-pass capacitor (C1), the low-pass resistor (R1), the high-pass capacitor (C2), and the high-pass resistor (R2) are adjusted, the pass frequency band of the band-pass filter (BPF) can be changed accordingly.

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