CN111025107A - Fault arc detection circuit and device and working condition detection method - Google Patents
Fault arc detection circuit and device and working condition detection method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/18—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers
- G01R15/181—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using inductive devices, e.g. transformers using coils without a magnetic core, e.g. Rogowski coils
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
- G01R19/2506—Arrangements for conditioning or analysing measured signals, e.g. for indicating peak values ; Details concerning sampling, digitizing or waveform capturing
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Abstract
The invention provides a fault arc detection circuit and a detection device, wherein the fault arc detection circuit comprises a mutual inductor circuit, a power supply conversion circuit and an arc detection module, wherein: the mutual inductor circuit is arranged on the live wire or the zero wire in a penetrating mode and used for acquiring induced current while acquiring current signals; the power supply conversion circuit is connected with the output end of the mutual inductor circuit and the arc detection module and used for converting the induction voltage into direct current and outputting the direct current to the arc detection module after the mutual inductor circuit obtains the induction current. Get the electricity through directly following the mutual-inductor to for the power supply of arc detection module after power conversion circuit carries out the conversion, need not the producer and additionally carry out the power adaptation, need not additionally to increase simultaneously and get the electrical part, reduced the cost.
Description
Technical Field
The invention relates to the field of fault detection, in particular to a fault arc detection circuit, a working condition detection method and a detection device.
Background
In the prior art, fault arc detection mostly adopts a scheme of double CT (Current transformer) and an arc detection module. Wherein arc detection module is higher to the power uniformity requirement of system, general module manufacturer sells the module for the third party producer after, need carry out power design in order to give detection module power supply by third party producer oneself, this wherein, the ripple of third party producer's power design, load carrying ability etc. all can produce uncertain influence to arc detection module's performance, it influences the accurate influence of bringing of discernment to the module if the parameter mismatch, so can make the commonality of module receive the influence, the cost also can increase simultaneously.
Disclosure of Invention
The invention mainly aims to provide a fault arc detection circuit, a working condition detection method and a detection device, and aims to solve the problems that in the prior art, power supply adaptation is difficult and cost is increased due to the fact that power taking devices are added when power supplies are adapted.
To achieve the above object, the present invention provides a fault arc detection circuit including: mutual-inductor circuit, power conversion circuit, electric arc detection module, wherein:
the mutual inductor circuit is arranged on the live wire or the zero wire in a penetrating mode and used for acquiring induced current while acquiring current signals;
the power supply conversion circuit is connected with the output end of the mutual inductor circuit and the arc detection module and used for converting the induction voltage into direct current and outputting the direct current to the arc detection module after the mutual inductor circuit obtains the induction current.
Optionally, the power conversion circuit includes a rectification circuit, a bleeder circuit, a filter circuit, and a DC-DC conversion circuit;
the rectifying circuit is connected with the output end of the mutual inductor circuit;
the discharge circuit is respectively connected with the rectifying circuit, the arc detection module and the filter circuit and is used for releasing current when receiving a control signal sent by the arc detection module;
the DC-DC conversion circuit is connected with the filter circuit and the arc detection module.
Optionally, the rectifying circuit includes a first diode, a second diode, a third diode, and a fourth diode;
the positive pole of the first diode is connected with the first output end of the mutual inductor circuit and the negative pole of the second diode, the negative pole of the first diode is connected with the negative pole of the third diode and the bleeder circuit, the positive pole of the third diode and the negative pole of the fourth diode are connected with the second output end of the mutual inductor circuit, and the positive pole of the fourth diode and the positive pole of the second diode are grounded.
Optionally, the fault arc detection circuit further comprises a current sampling circuit;
the current sampling circuit comprises a first resistor and a second resistor; the first end of the first resistor is connected with the anode of the second diode and the first sampling end of the arc detection module, and the second end of the first resistor is grounded; the first end of the second resistor is connected with the anode of the fourth diode and the second sampling end of the arc detection module, and the second end of the second resistor is grounded.
Optionally, the bleeder circuit comprises a third resistor and a first switching tube;
the first end of the third resistor is connected with the rectifying circuit and the filter circuit, the second end of the third resistor is connected with the input end of the first switch tube, the controlled end of the first switch tube is connected with the arc detection module, and the output end of the first switch tube is grounded.
Optionally, the first switching tube is an MOS tube.
Optionally, the filter circuit includes a first capacitor and a second capacitor;
the first end of the first capacitor and the first end of the second capacitor are connected with the direct-current input end of the DC-DC conversion circuit and the bleeder circuit, and the second end of the first capacitor and the second end of the second capacitor are grounded.
Optionally, the DC-DC conversion circuit includes a DC-DC converter, a third capacitor, and a fourth capacitor;
the direct current input end of the DC-DC converter is connected with the filter circuit; a filter capacitor end of the DC-DC converter is connected with a first end of the third capacitor, and a second end of the third capacitor is grounded; the direct current output end of the DC-DC converter is connected with the first end of the fourth capacitor and the arc detection module, and the second end of the fourth capacitor is grounded; the grounding end of the DC-DC converter is grounded.
In addition, in order to achieve the above object, the present invention further provides a method for detecting a working condition, the method comprising:
acquiring a secondary side induction current value of a transformer circuit, and acquiring an energy value corresponding to the induction current value;
when the energy value is smaller than a preset energy threshold value and the induction current value does not reach the preset threshold value, determining that the fault arc detection circuit is in a shutdown state;
when the energy value is greater than or equal to a preset energy threshold value and the induction current value does not reach the preset threshold value, determining that the fault arc detection circuit is in a stable working condition;
and when the induction current value is greater than or equal to a preset threshold value, determining that the fault arc detection circuit is in an overcurrent working condition.
In addition, to achieve the above object, the present invention also provides a detection apparatus comprising a fault arc detection circuit configured to detect a fault arc as described above or applied to the operating condition detection method as described above.
The fault arc detection circuit provided by the embodiment of the invention is provided with a mutual inductor circuit, a power supply conversion circuit and an arc detection module, wherein: the power supply conversion circuit is connected with the output end of the mutual inductor circuit and used for converting the voltage input by the mutual inductor circuit and outputting the converted voltage to the arc detection module. Get the electricity through directly getting from public alternating current with the help of the mutual-inductor to convert the power supply conversion circuit into the direct current after for the power supply of arc detection module, need not the producer and additionally carry out the power adaptation, need not additionally to increase simultaneously and get the electrical part, the cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of an embodiment of a fault arc detection circuit according to the present invention;
FIG. 2 is a detailed diagram of functional blocks of an embodiment of the fault arc detection circuit of the present invention;
FIG. 3 is a block diagram of a power conversion circuit for use with the embodiment of FIG. 2 in which the fault arc detection circuit of the present invention is implemented;
FIG. 4 is a front view of the fault arc detection device of the present invention;
fig. 5 is a side cross-sectional view of the fault arc detection device of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
The reference numbers illustrate:
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and back) in the embodiments of the present invention are only used to explain the relative position relationship between the components, the motion situation, and the like in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The present invention provides a fault arc detection circuit, which is applied in a detection device, such as a washing machine, a microwave oven, a television, etc., please refer to fig. 1, wherein fig. 1 is a functional block diagram of an embodiment of the fault arc detection circuit of the present invention. In this embodiment, the fault arc detection circuit includes a transformer circuit 100, a power conversion circuit 200, and an arc detection module 300, wherein an output terminal of the transformer circuit 100 is connected to the power conversion circuit 200 and the arc detection module 300, respectively, and an output terminal of the power conversion circuit 200 is connected to the arc detection module 300. Please refer to fig. 1 and fig. 2 together, wherein:
the transformer circuit 100 is disposed through a live line L or a neutral line (exemplified by the live line L in fig. 2), and is configured to acquire an induced current while acquiring a current signal. The transformer circuit 100 includes a low-frequency current transformer CT _ L and a high-frequency current transformer CT _ H, and in this embodiment, the low-frequency current transformer CT _ L is used for acquiring and outputting an induced current to the power conversion circuit 200;
the power conversion circuit 200 is connected to the output end of the transformer circuit 100 and the arc detection module 300, and is configured to convert the induced voltage into a direct current and output the direct current to the arc detection module 300 after the transformer circuit 100 obtains the induced current.
The transformer circuit 100 outputs the obtained induced current to the power conversion circuit 200, the power conversion circuit 200 converts the induced voltage into direct current and then outputs the direct current to the arc detection module 300, in the embodiment, the mutual inductor is used for directly getting electricity from the public alternating current, the power conversion circuit 200 is used for supplying electricity to the arc detection module 300 after performing alternating current-direct conversion, a manufacturer is not required to additionally perform power adaptation, an electricity-taking device is not required to be additionally arranged, the cost is reduced, meanwhile, the consistency problem of power design is guaranteed, and therefore the problem that the accuracy of arc detection and identification is reduced due to the fact that ripple and EMI (electromagnetic interference) parameters of a power supply designed by a third manufacturer do not reach the standard is solved. The method brings great convenience for third-party manufacturers to apply the arc detection module.
Further, referring to fig. 2 and fig. 3 together, in another embodiment, the power conversion circuit 200 includes a rectification circuit 201, a filter circuit 203, a bleeding circuit 202 and a DC-DC conversion circuit 204, and the arc detection module 300 includes a signal conditioning circuit 301 and an MCU 302. The rectifying circuit 201 is connected with the output end of the mutual inductor circuit 100; the bleeder circuit 202 is respectively connected with the rectification circuit 201, the MCU302 and the filter circuit 203, and is configured to release current when receiving a control signal sent by the MCU 302; the DC-DC conversion circuit 204 is connected to the filter circuit 203, the signal conditioning circuit 301, and the MCU 302.
In this embodiment, the secondary side of the low-frequency current transformer CT _ L in the transformer circuit 100 is connected to the power conversion circuit 200; the secondary side of the high-frequency current transformer CT _ H is connected with the signal conditioning circuit 301. The low-frequency current transformer CT _ L is used for acquiring the current on the line, acquiring the induced current and outputting the induced current to the power conversion circuit 200; the high-frequency current transformer CT _ H is mainly used for collecting high-frequency signals on a line for time domain/frequency domain analysis. In this embodiment, the high-frequency current transformer CT _ H employs a rogowski coil.
The signal conditioning circuit 301 is divided into a signal conditioning circuit 3011 (not shown in the figure) and a signal conditioning circuit 3012 (not shown in the figure), the signal conditioning circuit 3011 is connected to the current sampling circuit 205 and the MCU first sampling terminal ADC1, the signal conditioning circuit 3011 includes an amplifying circuit (not shown in the figure) and a low-pass filter circuit (not shown in the figure), the signal conditioning circuit 3012 is connected to the output terminal of the high-frequency current transformer CT _ H and the MCU second sampling terminal ADC2, and the signal conditioning circuit 3012 includes a signal amplifying circuit (not shown in the figure), an auxiliary integrating circuit (not shown in the figure) and a high-pass filter circuit (not shown in the figure).
The rectifying circuit 201 comprises a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4; the anode of the first diode D1 is connected to the first output terminal of the transformer circuit 100 and the cathode of the second diode D2, the cathode of the first diode D1 is connected to the cathode of the third diode D3 and the bleeder circuit 202, the anode of the third diode D3 and the cathode of the fourth diode D4 are connected to the second output terminal of the transformer circuit 100, and the anode of the fourth diode D4 and the anode of the second diode D2 are grounded.
The filter circuit 203 comprises a first capacitor C1 and a second capacitor C2; the first end of the first capacitor C1 and the first end of the second capacitor C2 are connected to the DC input terminal DCIN of the DC-DC converter circuit 204 and the bleeder circuit 202, and the second end of the first capacitor C1 and the second end of the second capacitor C2 are grounded.
The following description of the technical principle is made with reference to the above-described component structure and fig. 1 to 3:
the induced electricity output by the low-frequency current transformer CT _ L is an alternating current, and the signal conditioning circuit 301 and the MCU302 both require a direct current power supply to supply power, so that the alternating current needs to be converted into a direct current, and then the direct current passes through the DC-DC converter to output a stable direct current to the signal conditioning circuit 301 and the MCU 302. The rectifier circuit 201 in this embodiment employs a bridge rectifier circuit. The filter circuit 203 is used to reduce the ac component in the pulsating dc voltage as much as possible, and to retain the dc component, thereby reducing the ripple factor of the output voltage and smoothing the waveform.
The fault arc detection circuit further comprises a current sampling circuit 205; the current sampling circuit 205 includes a first resistor R1 and a second resistor R2; a first end of the first resistor R1 is connected to the anode of the second diode D2 and the first sampling end V + of the signal conditioning circuit 301, and a second end of the first resistor R1 is grounded; a first terminal of the second resistor R2 is connected to the anode of the fourth diode D4 and the second sampling terminal V-of the signal conditioning circuit 301, and a second terminal of the second resistor R2 is grounded.
Since the first resistor R1 and the second resistor R2 respectively have a half-cycle current flowing therethrough, the current value of the secondary side current of the low-frequency current transformer CT _ L can be obtained by measuring the first resistor R1 and the second resistor R2, and then the line current value i can be obtained by multiplying the secondary side current of the low-frequency current transformer CT _ L by the turn ratio of the coil of the low-frequency current transformer CT _ Lm。
The bleeder circuit 202 comprises a third resistor R3 and a first switch tube Q1; a first end of the third resistor R3 is connected to the rectifying circuit 201 and the filter circuit 203, a second end of the third resistor R3 is connected to an input end of the first switch tube Q1, a controlled end of the first switch tube Q1 is connected to the MCU302, and an output end of the first switch tube Q1 is grounded.
When the instantaneous current on the line is very large, in order to protect the devices of the power supply part and prevent the devices from being damaged by the instantaneous impact of the excessive energy, the MCU302 sends a control signal to turn on the switching tube in the bleeder circuit 202, and the redundant energy is consumed by the third resistor R3. The first switch transistor Q1 may be an MOS transistor, and when the first switch transistor Q1 is an MOS transistor, the first switch transistor Q1 is a PMOS transistor, and the controlled terminal, the input terminal, and the output terminal of the first switch transistor Q1 respectively correspond to the source, the gate, and the drain of the PMOS transistor.
The DC-DC conversion circuit 204 includes a DC-DC converter (not labeled), a third capacitor C3 and a fourth capacitor C4;
the direct current input end DCIN of the DC-DC converter is connected with the filter circuit 203; a filter capacitor terminal CIN of the DC-DC converter is connected to a first terminal of the third capacitor C3, and a second terminal of the third capacitor C3 is grounded; a direct current output end DCOUT of the DC-DC converter is connected with a first end of the fourth capacitor C4, the MCU302 and the signal conditioning circuit 301, and a second end of the fourth capacitor C4 is grounded; the ground terminal GND of the DC-DC converter is grounded.
In this embodiment, the DC-DC converter may internally integrate an LDO (low dropout regulator), and the filter capacitor end CIN is an internal LDO input filter capacitor end CIN, which cannot be shorted to ground, otherwise the converter may be permanently damaged, and therefore a third capacitor C3 needs to be connected.
In addition, the invention also provides a working condition detection method, which comprises the following steps:
step S10, acquiring a secondary side induction current value of the mutual inductor circuit, and acquiring an energy value corresponding to the induction current value;
step S20, when the energy value is smaller than a preset energy threshold value and the induction current value does not reach the preset threshold value, determining that the fault circuit detection circuit is in a shutdown state;
step S30, when the energy value is larger than or equal to a preset energy threshold value and the induction current value does not reach the preset threshold value, determining that the fault circuit detection circuit is in a stable working condition;
step S40, when the induction current value is greater than or equal to a preset threshold value, determining that the fault arc detection circuit is in an overcurrent condition;
the method is applied to a fault arc detection circuit, and the structure of the fault arc detection circuit can refer to the above embodiments, which are not described herein again.
The energy value Q is the sum of energy in preset N detection periods and is represented by Q, and the value of the energy value Q is the current value on a lineImDetermining that the calculation formula of the energy value Q is as follows:
wherein t is the detection period, N is the number of the detection periods, and N, t is set according to actual requirements. The t may be set by a timer.
The preset current threshold is set according to the impact resistance of a device in the power conversion circuit, and the stronger the impact resistance is, the larger the preset current threshold is set. The preset energy threshold is determined by the power consumption of the whole system, and the larger the system power consumption is, the larger the value of the preset energy threshold is.
When the current on the line is small, namely the energy value is smaller than a preset energy threshold value and the induced current value does not reach the preset threshold value, the induced current on the secondary side of the low-frequency current transformer is small, the normal operation of the fault arc detection circuit cannot be maintained, and the fault arc detection circuit is in a shutdown state at the moment, but because the current on the line is small, even if the arc occurs at the moment, the damage caused by the arc is small, so that the fault arc detection circuit can not carry out fault arc detection on the line at the moment; when the current on the line is gradually increased and stabilized, namely the energy value is greater than or equal to a preset energy threshold value and the induction current value does not reach the preset threshold value, the fault arc detection circuit is in a stable working condition at the moment, and the electric energy of the induction voltage of the secondary side of the low-frequency current transformer after conversion can meet the normal operation of the fault arc detection circuit; when the instantaneous current on the circuit is very large, namely when the induction current value is greater than or equal to the preset threshold value, the fault arc detection circuit is in an overcurrent working condition, in order to protect devices of the power supply part and prevent the devices from being damaged by the instantaneous impact of the overlarge energy, the MCU sends out a control signal to enable a switching tube in the bleeder circuit to be conducted, and redundant energy is consumed through the third resistor.
The working state is adjusted according to the current on the line, so that the line can be detected when the fault arc needs to be detected, and the line enters the sleep mode when the line current is too low and the fault arc does not need to be detected.
Further, the method further comprises:
acquiring samples of a low-frequency current transformer and a high-frequency current transformer;
judging whether a fault arc is generated or not according to the sampling;
when it is confirmed that the fault arc is generated, fault information is transmitted.
The method comprises the steps of setting a timer, sending a synchronizing signal through the timer, and sampling a low-frequency current transformer and a high-frequency current transformer through a first sampling end of an MCU and a second sampling end of the MCU according to the synchronizing signal, wherein the period of the synchronizing signal is 10ms in the embodiment. After sampling, the sampled data are quantized and form low frequency arrays LF ═ LF, respectively0，lf1，…，lfnAnd high frequency array HF ═ HF0，hf1，…，hfn}。
Analyzing the low-frequency array, calculating to obtain a difference set delta I of adjacent data in the low-frequency array, and calculating to obtain a median delta I of the delta ImAnd determining said Δ ImWhether the value is larger than a preset median threshold value lambda or not, when delta ImAnd when the value is larger than a preset median threshold value lambda, setting the low-frequency mark position 1, wherein the preset reference median value lambda is set according to an actual circuit.
Analyzing the high-frequency array, and calculating to obtain the numerical values in the high-frequency array which are larger than the reference value hfrefNumber n ofhCalculating and obtaining the variance S of each numerical value in the high-frequency arrayhAnd judging said nhWhether greater than a preset reference threshold η, the variance ShWhether the n is greater than a preset fluctuation threshold value sigma or not, when the n is greater than the preset fluctuation threshold value sigmahIs greater than a preset reference threshold η, and the variance ShAnd when the frequency is greater than the preset fluctuation threshold value sigma, marking the position 1 of the high-frequency mark. The variance ShAnd representing the fluctuation degree of the high-frequency signal, wherein the preset reference threshold η and the preset fluctuation threshold sigma are set according to an actual circuit.
And when the low-frequency marker bit and the high-frequency marker bit are simultaneously set to be 1, considering that the arc fault is suspected to occur in the detection period, and setting the arc marker of the fault in the period to be 1. And when the frequency of detecting the arc mark position 1 in the period within any preset time is greater than a preset fault threshold value delta, confirming that the arc fault occurs. Further, in this embodiment, the preset time is 1S, and the preset fault threshold δ is 14. And after the arc fault is confirmed to occur, indicating the fault through the I/O port, and reporting the fault through the communication port.
When the number of times of detecting the suspected fault arc in the preset time is larger than the preset fault threshold value, the arc fault is determined to be generated on the line, and misoperation is prevented.
The present invention also protects a detection device, which includes a fault arc detection circuit, and the structure of the fault arc detection circuit can refer to the above embodiments, and is not described herein again. It should be understood that, since the protection device of the present embodiment adopts the technical solution of the fault arc detection circuit, the protection device has all the beneficial effects of the fault arc detection circuit.
Further, referring to fig. 4 and 5 together, the detection device specifically includes an I/O interface line 1, a communication interface line 2, a plastic housing 3, a low-frequency current transformer 4, a high-frequency current transformer 5, a circuit board 6, and a potting adhesive 7. The I/O interface line 1, the communication interface line 2, the low-frequency current transformer 4 and the high-frequency current transformer 5 are welded on the circuit board 6, and the welded modules are placed in the plastic shell 3 and sealed and fixed by the pouring sealant 7. The plastic shell 3 is provided with 4 circular through holes and 1 rectangular through hole, the circular through holes are used for enabling the I/O interface line 1 and the communication interface line 2 to pass through the plastic shell 3, and the rectangular through holes are used for sampling through a live line L (or a zero line N).
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. The term "comprising", without further limitation, means that the element so defined is not excluded from the group of processes, methods, articles, or systems that include the element. The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A fault arc detection circuit, comprising: mutual-inductor circuit, power conversion circuit, electric arc detection module, wherein:
the mutual inductor circuit is arranged on the live wire or the zero wire in a penetrating mode and used for acquiring induced current while acquiring current signals;
the power supply conversion circuit is connected with the output end of the mutual inductor circuit and the arc detection module and used for converting the induction voltage into direct current and outputting the direct current to the arc detection module after the mutual inductor circuit obtains the induction current.
2. The fault arc detection circuit as claimed in claim 1, wherein said power conversion circuit comprises a rectifying circuit, a bleeding circuit, a filtering circuit, and a DC-DC conversion circuit;
the rectifying circuit is connected with the output end of the mutual inductor circuit;
the discharge circuit is respectively connected with the rectifying circuit, the arc detection module and the filter circuit and is used for releasing current when receiving a control signal sent by the arc detection module;
the DC-DC conversion circuit is connected with the filter circuit, the signal conditioning circuit and the arc detection module.
3. The fault arc detection circuit as claimed in claim 2, wherein said rectifying circuit comprises a first diode, a second diode, a third diode and a fourth diode;
the positive pole of the first diode is connected with the first output end of the mutual inductor circuit and the negative pole of the second diode, the negative pole of the first diode is connected with the negative pole of the third diode and the bleeder circuit, the positive pole of the third diode and the negative pole of the fourth diode are connected with the second output end of the mutual inductor circuit, and the positive pole of the fourth diode and the positive pole of the second diode are grounded.
4. The fault arc detection circuit as claimed in claim 3, wherein said fault arc detection circuit further comprises a current sampling circuit;
the current sampling circuit comprises a first resistor and a second resistor; the first end of the first resistor is connected with the anode of the second diode and the first sampling end of the arc detection module, and the second end of the first resistor is grounded; the first end of the second resistor is connected with the anode of the fourth diode and the second sampling end of the arc detection module, and the second end of the second resistor is grounded.
5. The fault arc detection circuit as claimed in claim 2, wherein said bleeding circuit comprises a third resistor and a first switching tube;
the first end of the third resistor is connected with the rectifying circuit and the filter circuit, the second end of the third resistor is connected with the input end of the first switch tube, the controlled end of the first switch tube is connected with the arc detection module, and the output end of the first switch tube is grounded.
6. The fault arc detection circuit as claimed in claim 5, wherein said first switching transistor is a MOS transistor.
7. The fault arc detection circuit as claimed in claim 2, wherein said filter circuit comprises a first capacitor and a second capacitor;
the first end of the first capacitor and the first end of the second capacitor are connected with the direct-current input end of the DC-DC conversion circuit and the bleeder circuit, and the second end of the first capacitor and the second end of the second capacitor are grounded.
8. The fault arc detection circuit as claimed in claim 2, wherein said DC-DC conversion circuit comprises a DC-DC converter, a third capacitor and a fourth capacitor;
the direct current input end of the DC-DC converter is connected with the filter circuit; a filter capacitor end of the DC-DC converter is connected with a first end of the third capacitor, and a second end of the third capacitor is grounded; the direct current output end of the DC-DC converter is connected with the first end of the fourth capacitor and the arc detection module, and the second end of the fourth capacitor is grounded; the grounding end of the DC-DC converter is grounded.
9. A working condition detection method is applied to the fault arc detection circuit of any one of 1-8, and comprises the following steps:
acquiring a secondary side induction current value of a transformer circuit, and acquiring an energy value corresponding to the induction current value;
when the energy value is smaller than a preset energy threshold value and the induction current value does not reach the preset threshold value, determining that the fault arc detection circuit is in a shutdown state;
when the energy value is greater than or equal to a preset energy threshold value and the induction current value does not reach the preset threshold value, determining that the fault arc detection circuit is in a stable working condition;
and when the induction current value is greater than or equal to a preset threshold value, determining that the fault arc detection circuit is in an overcurrent working condition.
10. A detection apparatus, characterized in that the electronic device comprises a fault arc detection circuit configured as a fault arc detection circuit according to any one of claims 1-8 or applying the condition detection method according to claim 9.
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| CN201911424688.5A CN111025107A (en) | 2019-12-31 | 2019-12-31 | Fault arc detection circuit and device and working condition detection method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021217991A1 (en) * | 2020-04-29 | 2021-11-04 | 威胜集团有限公司 | Signal compensation method and apparatus, and storage medium |
| CN117373807A (en) * | 2023-09-01 | 2024-01-09 | 国网信息通信产业集团有限公司 | Integrated current transformer and fault detection method |
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2019
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021217991A1 (en) * | 2020-04-29 | 2021-11-04 | 威胜集团有限公司 | Signal compensation method and apparatus, and storage medium |
| CN117373807A (en) * | 2023-09-01 | 2024-01-09 | 国网信息通信产业集团有限公司 | Integrated current transformer and fault detection method |
| CN117373807B (en) * | 2023-09-01 | 2024-05-10 | 国网信息通信产业集团有限公司 | Integrated current transformer and fault detection method |
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