CN207703970U - Electrical equipment and its arc detecting device - Google Patents
Electrical equipment and its arc detecting device Download PDFInfo
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- CN207703970U CN207703970U CN201721686161.6U CN201721686161U CN207703970U CN 207703970 U CN207703970 U CN 207703970U CN 201721686161 U CN201721686161 U CN 201721686161U CN 207703970 U CN207703970 U CN 207703970U
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Abstract
The embodiment of the present application provides a kind of electrical equipment and its arc detecting device, the device include：Amplifier module and the signal processing module being connect with the signal output end of the amplifier module；Wherein, amplifier module is sampled to obtain sampled signal for the current signal to resistive load, and sampled signal, which is amplified to the signal processing module, can distinguish arcing critical point voltage and reference voltage range；Signal processing module, for determining whether there is arcing according to more amplified sampled signal processing costs and preset value.The precision of arcing detection can be improved in the embodiment of the present application, and realizes that simple cost is relatively low.
Description
Technical field
This application involves arcing detection technique fields, more particularly, to a kind of electrical equipment and its arc detecting device.
Background technology
Arcing refers to when voltage makes air ionization become conductor more than the tolerance of air and generates electric arc the phenomenon that.And it draws
High temperature caused by arc may bring many harm, for example arcing may be damaged equipment and (such as component be made to melt or fragmentation
Deng), in some instances it may even be possible to fire can be caused.Therefore, arcing detection is of great significance.
In currently available technology, arcing detection is by treated the tim e- domain detection signal such as sampled, amplification, analog-to-digital conversion
It is converted into frequency-region signal or pulse signal, then judges whether to generate based on the frequency-region signal or pulse signal obtained after conversion again
Arcing.Since tim e- domain detection signal is converted into having the loss of part actual signal during frequency-region signal or pulse signal, this
Affect the precision of existing arcing detection scheme.
Utility model content
The embodiment of the present application is designed to provide a kind of electrical equipment and its arc detecting device, to improve arcing detection
Precision.
In order to achieve the above objectives, on the one hand, the embodiment of the present application provides a kind of arc detecting device, including：
Amplifier module and the signal processing module being connect with the signal output end of the amplifier module；Wherein,
Amplifier module is sampled to obtain sampled signal for the current signal to resistive load, by sampled signal
Arcing critical point voltage and reference voltage range can be distinguished by being amplified to the signal processing module；
Signal processing module, for determining whether there is drawing according to more amplified sampled signal processing costs and preset value
Arc.
Preferably, the arc detecting device further includes：
Direct current biasing module, for carrying out direct current biasing to the amplified sampled signal of amplifier module；The direct current
The signal input part of biasing module is connect with the signal output end of the amplifier module, the signal of the direct current biasing module
Output end is connect with the signal input part of the signal processing module；
Correspondingly, the signal processing module be used for according to after direct current biasing sampled signal processing costs and comprising direct current it is inclined
The preset value for the amount of setting determines whether there is arcing.
Preferably, the arc detecting device further includes：
Full-wave rectification block carries out reverse phase processing for the negative half-cycle signal to amplified sampled signal；The all-wave
The signal input part of rectification module is connect with the signal output end of the amplifier module, the signal of the full-wave rectification block
Output end is connect with the signal input part of the signal processing module；
Correspondingly, the signal processing module is used to be determined according to reverse phase treated sampled signal processing costs and preset value
With the presence or absence of arcing.
Preferably, the amplifier module includes signal sampling module and amplification module, the signal sampling module
Signal output end is connect with the signal input part of the amplification module；Wherein, signal sampling module is used for the electricity to resistive load
Stream signal is sampled to obtain sampled signal；Amplification module is used to the sampled signal being amplified to the signal processing module energy
Enough distinguish arcing critical point voltage and reference voltage range.
Preferably, the signal processing module includes analog-to-digital conversion module and processor, the letter of the analog-to-digital conversion module
Number input terminal is connect with the signal output end of the amplification module, the signal output end of the analog-to-digital conversion module and the processing
The signal input part of device connects；Turn correspondingly, the amplifier module is used to the sampled signal being amplified to the modulus
Mold changing block can distinguish arcing critical point voltage and reference voltage range.
Preferably, the signal processing module determines whether according to more amplified sampled signal processing costs and preset value
There are one of arcings, including following manner：
Arcing is determined whether there is according to more amplified sampled signal and reference voltage range；
According to slope is compared and default slope range determines whether there is arcing, the slope is amplified when time sampling
Signal and the slope of sampled signal several times before time sampled signal；
According to difference is compared and preset difference value range determines whether there is arcing, the difference is amplified when time sampling
Signal and the difference of sampled signal several times before time sampled signal.
Preferably, the signal processing module is true according to more amplified sampled signal and preset reference voltage range
Surely it whether there is arcing, including：
When loading in running order, N number of voltage sample value of continuous acquisition is respectively positioned in the reference voltage range
When, confirmation detects an arcing；Wherein N is preset first amount threshold.
Preferably, the arc detecting device further includes：Alarm and/or load switching off device, for working as the signal processing
When module is consecutively detected M arcing, carries out arcing alarm and/or disconnect load with power supply；Wherein M is preset second number
Measure threshold value.
Preferably, the signal processing module is additionally operable to determine whether the resistive load is in operating status.
Preferably, the signal processing module confirms whether the resistive load is in operating status, including：
When R voltage sample value of the analog-to-digital conversion module continuous acquisition is all higher than predetermined voltage threshold, the letter
Number processing module confirms that the resistive load is in operating status；Wherein R is preset third amount threshold.
Preferably, the signal processing module confirms whether the resistive load is in operating status, further includes：
When S voltage sample value of the analog-to-digital conversion module continuous acquisition is respectively positioned on the reference voltage range, institute
It states signal processing module and confirms that the load is in halted state, and will be reset for the counting of wherein M and N；Wherein S is default
The 4th amount threshold.
Preferably, the voltage value of the arcing critical point voltage is obtained previously according to following manner：
The lasting minimum duration T that load current is zero during the arcing that predetermined needs identify；
According to formulaDetermine the phase of arcing critical point voltage；
According to formula UA=U0Sin θ determines the voltage value of arcing critical point voltage；
Wherein, θ is the phase angle of arcing critical point voltage, T0For alternating current voltage period, UAFor arcing critical point voltage
Voltage value, U0For alternating current voltage peak value.
Preferably, the amplification module and the direct current biasing module are realized by the way that operational amplifier is isolated.
Preferably, the signal sampling module includes current transformer.
Preferably, it includes electrical heating elements to state resistive load.
On the other hand, the embodiment of the present application also provides a kind of electrical equipment, the electrical equipment includes：
Power end,
The resistive load being connect with the power end, and,
Be set between the power end and the resistive load such as above-mentioned arc detecting device.
Preferably, the electrical equipment includes electric heater, and the resistive load includes the electrical heating of the electric heater
Element.
By the above technical solution provided by the embodiments of the present application as it can be seen that the arcing detection scheme of the embodiment of the present application is to resistance
Property load current signal sampled and obtain sampled signal after, can will be amplified to arc detecting device to sampled signal can
Distinguish arcing critical point voltage and reference voltage range degree so that arc detecting device can directly time domain according to than
More amplified sampled signal processing costs and preset value determine whether there is arcing, to improve the precision of arcing detection and resist
Interference performance.Also, compared with prior art, the embodiment of the present application is also avoided is converted into frequency-region signal or arteries and veins by time-domain signal
The problem of part actual signal rushed caused by signal is lost, to be conducive to further increase the precision of arcing detection.
Description of the drawings
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments described in application, for those of ordinary skill in the art, in the premise of not making the creative labor property
Under, other drawings may also be obtained based on these drawings.In the accompanying drawings：
Fig. 1 is the structure diagram of electrical equipment in one embodiment of the application；
Fig. 2 is the functional block diagram of arc detecting device in one embodiment of the application；
Fig. 3 is the functional block diagram of arc detecting device in another embodiment of the application；
Fig. 4 is the circuit diagram of arc detecting device in one embodiment of the application；
Fig. 5 is the circuit diagram of arc detecting device in another embodiment of the application；
Fig. 6 is the functional block diagram of arc detecting device in another embodiment of the application；
Fig. 7 is the circuit diagram of arc detecting device in another embodiment of the application；
Fig. 8 is the waveform diagram of voltage signal and voltage amplification signal in one embodiment of the application；
Fig. 9 is the voltage amplification after voltage signal, voltage amplification signal and direct current biasing in one embodiment of the application
The waveform diagram of signal；
Figure 10 is the waveform diagram of the voltage signal obtained after full-wave rectification in one embodiment of the application；
Figure 11 is that there are the voltage change schematic diagrames (non-direct current biasing) when arcing in one embodiment of the application；
Figure 12 is that there are the voltage change schematic diagrames (direct current biasing) when arcing in one embodiment of the application.
Specific implementation mode
In order to make those skilled in the art better understand the technical solutions in the application, below in conjunction with the application reality
The attached drawing in example is applied, technical solutions in the embodiments of the present application is clearly and completely described, it is clear that described implementation
Example is merely a part but not all of the embodiments of the present application.Based on the embodiment in the application, this field is common
The every other embodiment that technical staff is obtained without creative efforts should all belong to the application protection
Range.
Studies have shown that the electrical equipment of resistive load (especially pure resistor load) is easy to lead under the states such as poor contact
Cause the generation of arcing.Specifically, when some position of resistive load access is small there are poor contact or breaking gap,
It is easy to form voltage between the contact of both sides, this voltage follows the variation of sine waveform.Voltage, which is gradually increased, reaches certain
When a electrical voltage point (i.e. breakdown potential pressure point), breakdown air makes air molecule ionize, to form arc current (i.e. arcing), arc current
Ionization can be further exacerbated by by generating high temperature, to form access；It is slowly reduced after voltage reaches sine wave wave crest, with
Voltage reduces, and arcing and access can disconnect and continue for some time in some electrical voltage point (i.e. off voltage point)；Hereafter, with electricity
Pressure increases again, can puncture air again after voltage arrives again at breakdown potential pressure point and form arcing and access, when voltage is from peak
Value is again lowered to arcing and access after off voltage point and can be again off and continue for some time, repeatedly.
For accurately detect resistive load whether there is arcing, in the application embodiment can to corresponding electrical equipment into
Row improves.Refering to what is shown in Fig. 1, in some embodiments of the application, improved electrical equipment may include：Power end,
The resistive load being connect with the power end, and the arcing detection being connected between the power end and the resistive load fill
It sets.Wherein, the power end can be used as power interface；The arc detecting device can be used for detecting whether the resistive load deposits
In arcing.Wherein, the electrical equipment can be any resistive load equipment, such as in some illustrative embodiments, institute
It can be electric heater etc. to state electrical equipment；Correspondingly, when the electrical equipment is electric heater, the resistive load can be with
For the electrical heating elements (such as heating rod etc.) of the electric heater.
In some embodiments of the application, arc detecting device described in present embodiment may include amplifier mould
Block and the signal processing module being connect with amplifier module by signal output end.Wherein, amplifier module can be used for resistive
The current signal of load is sampled to obtain sampled signal, sampled signal is amplified to signal processing module can distinguish arcing and face
Boundary's point voltage and reference voltage range；Signal processing module can be used for according to more amplified sampled signal processing costs and preset
Value determines whether there is arcing.
In the embodiment of the application, in conjunction with shown in Fig. 2, it is preferred that the amplifier module may include letter
Number sampling module and amplification module.Wherein, the signal of the signal output end and the amplification module of the signal sampling module is defeated
Enter end connection；Signal sampling module to the current signal of resistive load for being sampled to obtain sampled signal；Amplification module is used
Arcing critical point voltage and reference voltage range can be distinguished in the sampled signal is amplified to the signal processing module.Example
As in one embodiment, signal sampling module can be realized by current transformer and sampling resistor, and amplification module can be by amplification electricity
The realizations such as road or integrated amplifier (such as operational amplifier).In another embodiment herein, the amplifier
Module can also be realized by having the current transformer of enlarging function and sampling resistor.Wherein, the electricity for having enlarging function
Current transformer, such as the form realization of multigroup coiling can be used.In the case, the current sensor can be used for obtaining resistive
The current signal of load is simultaneously amplified, and sampling resistor then can be used for being converted into corresponding to by amplified current signal
Voltage signal so that the arc detecting device can distinguish arcing critical point voltage and reference voltage range.
In some embodiments of the application, the signal processing module is handled according to more amplified sampled signal
The specific implementation that value and preset value determine whether there is arcing can have many modes.Specifically, can for example be put according to comparing
Sampled signal and reference voltage range after big determine whether there is arcing；It can also be according to comparing slope and default slope range
Determine whether there is arcing, the slope be it is amplified when time sampled signal respectively with it is described before time sampled signal several times
Slope between sampled signal；Can also be according to difference be compared and preset difference value range determines whether there is arcing, the difference is
It is amplified when time sampled signal and the difference, etc. of sampled signal several times before time sampled signal.Wherein, processing costs
Can directly acquire or do slope calculating, do mathematic interpolation etc..Therefore, compared with prior art, the application is to described
Sampled signal, which is amplified to arc detecting device, can distinguish arcing critical point voltage and reference voltage range, have arcing detection essence
The characteristics of degree is high, strong antijamming capability.
It is described to be according to more amplified sampled signal and reference voltage range determination in an illustrative embodiments
No there are arcings, such as may include：When resistive load is in operating status, if N number of voltage sample value of continuous acquisition
It is respectively positioned in the reference voltage range, then confirms and detect an arcing；Wherein N is preset first amount threshold, specifically
Can as needed, according to experiment or it is empirically determined, preferably, N >=2.As can be seen that present embodiment judges doubtful arcing
It during above-mentioned judgement arcing, all highlights premised on the judgement of continuous sampling point, can individually be adopted to avoid foundation in this way
Sampling point judged and caused by judge by accident.This judgement based on continuous sampling point actually also can be considered a kind of and be held to arcing
The judgement of continuous time.Such as the judgement to the doubtful arcing of above-mentioned judgement, N number of voltage of the analog-to-digital conversion module continuous acquisition are adopted
Sample value is respectively positioned in the reference voltage range, it is believed that be the analog-to-digital conversion module when a length of N number of Δ t continuous sampling
The voltage sample value exported in period is respectively positioned in the reference voltage range.
In some embodiments of the application, the signal processing module can be with analog-to-digital conversion module and processor.Phase
It answers, the signal input part of the analog-to-digital conversion module and the signal output end of amplification module connect, the analog-to-digital conversion module
Signal output end and processor signal input part connect；Correspondingly, amplification module is used to sampled signal being amplified to modulus
Conversion module can distinguish arcing critical point voltage and reference voltage range.And in other embodiments of the application, such as
Fruit processor itself is integrated with analog-digital conversion function, then the signal processing module can also be this to be integrated with analog-to-digital conversion work(
The processor of energy.
The arcing detection scheme of the embodiment of the present application is sampled in the current signal to resistive load obtains sampling letter
After number, the journey of arcing critical point voltage and reference voltage range can be distinguished by arc detecting device is amplified to sampled signal
Degree, so that arc detecting device can be determined directly in time domain according to more amplified sampled signal processing costs and preset value
With the presence or absence of arcing, to improve the precision and anti-interference ability of arcing detection.Also, compared with prior art, the application
Embodiment also avoids asking for the part actual signal loss being converted into time-domain signal caused by frequency-region signal or pulse signal
Topic, to be conducive to further increase the precision of arcing detection.In addition, compared with prior art, the drawing of the application embodiment
Arc detection scheme eliminates the processing procedure that time-domain signal is converted into frequency-region signal or pulse signal, and scheme is simple, is easy to real
It is existing.
In one embodiment of the application, in normal state, when the electric field strength of application be enhanced to it is resistance to more than air
By range, so that air ionization is become conductor and form voltage corresponding when arcing, breakdown point voltage can be referred to as.Correspondingly,
Under arcing state, when the electric field strength of application weaken to be not enough to breakdown air when, make air terminate ionization and disconnect
Corresponding voltage when arcing, can be referred to as cut-off point voltage.As a result, due to the breakdown point voltage and the cut-off point voltage
The separation for belonging to arcing critical condition may be collectively referred to as arcing critical point voltage.
In one embodiment of the application, under normal circumstances, the voltage signal that amplifier module obtains is by sine wave
The voltage signal of variation has peak value and valley (such as peak value can be 250mV, and valley can be -250mV).Theoretically base
It is exactly when corresponding electrical voltage point that load current is zero that quasi- voltage range is corresponding, but due to the signal voltage value of critical point voltage
It is small, simultaneously because signal jitter and external disturbance, cause the interference signal of critical point voltage and zero crossings can not distinguish, so
Carry out signal amplification；In order to improve fault-tolerance of system itself and convenient for the detection of arcing, so present embodiment needs are set
The tolerance of reference voltage both reference voltage ranges are set, the setting standard of reference voltage range is that can cover after zooming
The interference signal of zero crossings, and arcing critical point voltage can be distinguished except reference voltage range.
In one embodiment of the application, after specifying analog-to-digital conversion module (such as being built-in with analog-to-digital conversion mould
For the processor of block, when processor has selected, analog-to-digital conversion module also determines), correspondingly, the resolution of analog-to-digital conversion module
Rate also determines that.In the case, in order to enable analog-to-digital conversion module to distinguish arcing critical point voltage and reference voltage model
It encloses, needs fully to be amplified the sampled signal, in some cases, it might even be possible to allow signal being amplified to distortion shape
State, or to signal, the signal section of the permission input voltage value beyond analog-to-digital conversion module carries out at clamper in the case of necessary
Reason.
Above-mentioned capable of distinguishing is understood that：The resolution capability of analog-to-digital conversion module is limited, if amplification
Multiple is inadequate, and analog-to-digital conversion module may be made to take for collected arcing critical point voltage, which is load current, corresponds to when being zero
Sampled signal voltage value, to can not be distinguished with reference voltage range；In the case, such as shown in Figure 11, work as electricity
Pressure is changed to from cut-off point voltage change to zero-point voltage, then from zero-point voltage in this stage of breakdown point voltage, regardless of whether
Arcing occurs, the voltage value in the stage can be identified as corresponding sampled signal when load current is zero by analog-to-digital conversion module
Voltage value (unless voltage value is more than arcing critical point voltage) judges in this way, can not subsequently carry out effective arcing detection.Cause
This, need by the voltage signal be at least amplified to the analog-to-digital conversion module can distinguish arcing critical point voltage and benchmark electricity
Press range.
Consider the uncertain factors such as actual interference, voltage fluctuation, can be set previously according to actual tests data and result of calculation
Determining reference voltage range, (0 ± Δ u) is to have arcing generation for judgement.Wherein, ± Δ u is tolerance (if amplifying
In the case of increasing direct current biasing V afterwards, then reference voltage range can be V ± Δs u).
It is 2. amplified waveform as shown in figure 8, being 1. the voltage waveform before amplification, t1 and the corresponding points of t2 are arcing
Critical point.If needing a length of Δ t=t2-t1 when the arcing identified, during Δ t >=T, T be the arcing that the needs set identify
The lasting minimum duration that load current is zero.In an illustrative embodiments, the numerical value of T can be carried out according to U.S.'s UL standards
Setting；And in other embodiments, the numerical value of T can be set according to actual conditions, and therefore, the application does not limit this
It is fixed.
Ideally, arcing occur in two at arcing critical point relative to 0 point symmetry.It then can be theoretically according to T
The arcing critical point voltage and corresponding phase theta that analog-to-digital conversion module can identify are calculated, specifically：
If power grid ac cycle is T0, then according to formulaIt can determine and corresponded at minimum arcing critical point voltage
Phase angle beThen, it is U to need the arcing critical point voltage that identification is distinguishedA=U0sinθ；Wherein, U0Before amplification
Voltage waveform peak value.
Obviously, if UA≤ Δ u then needs the enhanced processing for carrying out signal.And distinguished for the ease of identification, amplification factor needs
Meet N Δs u/UA, that is, think at this amplification factor N, the analog-to-digital conversion module can distinguish arcing critical point voltage and
Zero crossing voltage.
If amplification factor beyond the analog-to-digital conversion module sampled level extreme value (such as 0~3.3V of sampled level range,
Corresponding maximum is 3.3V, minimum 0V), it is also necessary to additionally the part beyond sampled level extreme value is carried out at clamper
Reason.Amplified arcing critical point voltage is at least needing to meet Ub=N*UAUnder the premise of, appropriate amplification is needed, such as can root
Amplification factor can be set to Δ u/U according to experienceAIf preferably, amplified signal amplitude exceed sampled level extreme value, need into
The processing of row clamper.
In an illustrative embodiments, according to relevant U.S. UL safety standards, constant T=0.00042s can be set,
Mains frequency is 50Hz, then its cycle T 0=0.02s, so as to calculateCorrespondingly,
UA=U0Sin θ=0.555*sin0.021 π=0.0366V.
Obviously, 0.036 ＜, 0.15 (i.e. Umin＜ Δs u), it is therefore desirable to be amplified processing.It is in amplification factorIn the case of, although actually N is bigger, test error is smaller, considers under actual conditions two
The asymmetry of adjacent critical point and interference, may be selected 5 times or more amplifying powers amplification module, in order to can be test there are
Enough surpluses.And there are many selections for isolation amplifier, also type is various for amplification factor, and it is actively inclined to normally isolate the included output of amplifier
Set voltage.Assuming that tolerance Δ u is 0.1V, then using direct current biasing 1.65, reference voltage range can be set
For 1.65 ± 0.1V.
It should be noted that the mode of above-mentioned setting reference voltage range is merely illustrative of, and it is not construed as to this Shen
Limitation please.In the application other embodiment, reference voltage range can also be angularly set from power.
Refering to what is shown in Fig. 3, in another embodiment of the application, the arc detecting device can also include direct current biasing
Module can be used for carrying out direct current biasing to the amplified sampled signal of amplifier module；The direct current biasing module
Signal input part is connect with the signal output end of the amplifier module, the signal output end of the direct current biasing module and institute
State the signal input part connection of signal processing module；Correspondingly, the signal processing module can be according to the sampling after direct current biasing
Signal processing value and preset value comprising direct current biasing amount determine whether there is arcing.Certainly, in the case, preset benchmark
Voltage range also should be carry out direct current biasing in the case of obtained from reference voltage range.In this way, according to direct current biasing by base
Quasi- voltage range is raised, such as shown in Figure 12, so as to ensure detectable range of the waveform in processor of entire arcing, i.e.,
So that the arcing positioned at negative half period can also be detected.In fig. 12, Ud、U0And UjCut-off point voltage, zero crossing are indicated respectively
Voltage and breakdown point voltage, Δ t indicate the sampling period of analog-to-digital conversion module, and T=t2-t1 be to need to judge with the presence or absence of drawing
The period of arc.
Refering to what is shown in Fig. 4, in one embodiment of the application, the signal sampling module may include current transformer
L2, resistance R1 and resistance R9.Such signal sampling module it is simple and reliable for structure, and cost of implementation is low.Wherein, the electric current
Mutual inductor L2 can be used for acquiring the current signal of resistive load, and what resistance R1 then can be used for acquiring the current transformer L2
Current signal is converted into corresponding voltage signal.Wherein, the both ends (i.e. 3 ends and 4 ends) of the primary side of current transformer L2 are as defeated
Enter end, the circuit for connecting resistive load；The both ends (i.e. 1 end and 2 ends) on the secondary side of current transformer L2 are used as output end；Electricity
Resistance R1 is connected across the both ends on the secondary side of current transformer L2, and one end of resistance R9 is connected with 2 ends on the secondary side of current transformer L2,
The other end of resistance R9 is connected with amplification module, is supplied to amplification module to handle the voltage signal obtained after conversion.Certainly,
In the application other embodiment, the signal sampling module can also be realized according to other modes, such as electric current therein
Mutual inductor can be replaced the current sensors such as Hall sensor.
In conjunction with shown in Fig. 4, in one illustrative embodiments of the application, the amplification module for example can be operation amplifier
Device.In Fig. 4, the resistance R9 as the in-phase input end of the operational amplifier of amplification module and the signal sampling module connects
It connects, to receive the voltage signal that the signal sampling module provides；The output end of operational amplifier is inclined according to capacitance C3 and direct current
It sets module to be connected, amplified voltage signal is supplied to the direct current biasing resume module.
In conjunction with shown in Fig. 4, in one illustrative embodiments of the application, the direct current biasing module may include resistance
One end of R25, resistance R25 connect DC offset voltage (ends UP shown in Fig. 4) and the amplification module respectively as input terminal
Output end, the amplified voltage signal that the amplification module is exported carry out direct current biasing processing；The other end of resistance R25
It is connected with the processor as output end, the voltage signal after direct current biasing is supplied to the analog-to-digital conversion of the processor
Resume module.
In the application another exemplary embodiment, can also directly it be put according to described in an isolation operational amplifier realization
Big module and the direct current biasing module, such as shown in Fig. 5, wherein VINN pins are the input terminal that operational amplifier U5 is isolated；
VOP pins are the output end that operational amplifier U5 is isolated, and VOP pins can be connected according to resistance R10 with processor.Using it is this every
Circuit structure is not only simplified from operational amplifier, the measurement error caused by ground loop can also be eliminated, to be conducive to
Further increase the precision of arcing detection.
In one embodiment of the application, the processor includes but not limited to micro-control unit (Microcontroller
Unit, i.e. MCU) (such as microcontroller etc.), digital signal processor (Digital Signal Processing, abbreviation DSP),
Programmable logic device (Programmable Logic Device, abbreviation PLD) etc..As shown in figure 4, in an exemplary implementation
In mode, the processor may include the MCU of model PIC30F210, the 2nd pin of the MCU of model PIC30F210
As signal input part, it is connected with the output end of direct current biasing module.As shown in figure 5, in another exemplary embodiment, when
When realizing the amplification module and the direct current biasing module according to isolation operational amplifier, the MCU of model PIC30F210
The 2nd pin then can with the output end that operational amplifier is isolated be connected.
Refering to what is shown in Fig. 6, in another embodiment of the application, the arc detecting device can also include full-wave rectification
Module can be used for carrying out reverse phase processing to the negative half-cycle signal of amplified sampled signal；The full-wave rectification block
Signal input part is connect with the signal output end of the amplifier module, the signal output end of the full-wave rectification block and institute
State the signal input part connection of signal processing module；Correspondingly, the signal processing module can according to reverse phase treated sampling
Signal processing value and preset value determine whether there is arcing.
Similar with above-mentioned direct current biasing module, the purpose for increasing full-wave rectification block is, amplifies according to by amplification module
The negative half-cycle signal of voltage signal afterwards is overturn to positive half cycle (such as shown in Figure 10), it can be ensured that the waveform of entire arcing is being located
The detectable range of device is managed, i.e., so that the arcing positioned at negative half period can also be detected.
In conjunction with shown in Fig. 7, in an illustrative embodiments, the full-wave rectification block for example can be that single-phase full wave is whole
Flow module may include diode D1, diode D2 and resistance R25, wherein after diode D1 and diode D2 reverse parallel connections
It connects with resistance R25；One end of resistance R25 is connected with the output end of the amplification module, is exported with receiving the amplification module
Amplified voltage signal；The other end of resistance R25 is connected with the input terminal of the processor, the voltage letter after overturning
Number the analog-to-digital conversion module of the processor is supplied to handle.
It should be noted that in some cases, some processors have been internally integrated analog-to-digital conversion module, because without examining
The problem of considering setting analog-to-digital conversion module.It in other cases, can when being not integrated with analog-to-digital conversion module inside processor
To add an independent analog-to-digital conversion module, which can be whole by amplification module, direct current biasing module or all-wave
The voltage analog signal that flow module provides is converted into corresponding voltage digital signal, and the processor is supplied to handle.
In one embodiment of the application, the arc detecting device can also include alarm and/or load switching off device；
It can be used for when the signal processing module is consecutively detected M arcing, carry out arcing alarm and/or will load and power supply
Disconnect, to avoid or reduce harm of the arcing to electrical equipment；Wherein M is preset second amount threshold.Wherein, the arcing
Alarm can be word alarm, audio alert and/or light alarm etc..The load switching off device for example can be concatenation
In the controllable switch (as shown in Fig. 2, Fig. 3 or Fig. 6) etc. on the circuit of the resistive load.
It is necessary to note that above-mentioned arcing detection method is judged more there is practical meaning when resistive load is in operating status
Justice.Therefore, in one embodiment of the application, before the current signal for obtaining resistive load, the signal processing module is also
It can determine whether the resistive load is in operating status.Such as the R voltage when the analog-to-digital conversion module continuous acquisition
When sampled value is all higher than predetermined voltage threshold, it can confirm that the resistive load is in operating status；Wherein R is preset third number
Measure threshold value；And when S voltage sample value of the analog-to-digital conversion module continuous acquisition is respectively positioned on the reference voltage range, also
It can be confirmed that the load is in halted state, and will be reset for the counting of wherein M and N, in order to be done to count next time
It is good to prepare；Wherein S is preset 4th amount threshold.
It should be noted that when above-mentioned arc detecting device uses direct current biasing module, correspondingly, at described
Before determining whether there is arcing according to more amplified voltage signal and preset reference voltage range, can also include：It is right
Amplified voltage signal carries out the step of direct current biasing.In an illustrative embodiments, the voltage that is obtained after direct current biasing
Signal can be as shown in the chain-dotted line in Fig. 9.Correspondingly, described according to more amplified voltage signal and preset reference voltage
Range determines whether there is arcing, can be according to after direct current biasing voltage signal and preset reference voltage range determination be
It is no that there are arcings.
For convenience of description, it is divided into various units when description apparatus above with function to describe respectively.Certainly, implementing this
The function of each unit can be realized in same or multiple hardware when application.
Each embodiment in this specification is described in a progressive manner, identical similar portion between each embodiment
Point just to refer each other, and each embodiment focuses on the differences from other embodiments, and related place refers to
The part of device embodiment illustrates.
It should also be noted that, the terms "include", "comprise" or its any other variant are intended to nonexcludability
But also include not having including so that method, apparatus or equipment including a series of elements include not only those elements
The other element being expressly recited, or further include for this method, apparatus or the intrinsic element of equipment.Not more
In the case of limitation, the element that is limited by sentence "including a ...", it is not excluded that in the method, apparatus for including the element
Or there is also other identical elements in equipment.
Above is only an example of the present application, it is not intended to limit this application.For those skilled in the art
For, the application can have various modifications and variations.It is all within spirit herein and principle made by any modification, equivalent
Replace, improve etc., it should be included within the scope of claims hereof.
Claims (17)
1. a kind of arc detecting device, which is characterized in that including：
Amplifier module and the signal processing module being connect with the signal output end of the amplifier module；Wherein,
Amplifier module is sampled to obtain sampled signal, sampled signal is amplified for the current signal to resistive load
Arcing critical point voltage and reference voltage range can be distinguished to the signal processing module；
Signal processing module, for determining whether there is arcing according to more amplified sampled signal processing costs and preset value.
2. arc detecting device as described in claim 1, which is characterized in that the arc detecting device further includes：
Direct current biasing module, for carrying out direct current biasing to the amplified sampled signal of amplifier module；The direct current biasing
The signal input part of module is connect with the signal output end of the amplifier module, the signal output of the direct current biasing module
End is connect with the signal input part of the signal processing module；
Correspondingly, the signal processing module be used for according to after direct current biasing sampled signal processing costs and include direct current biasing amount
Preset value determine whether there is arcing.
3. arc detecting device as described in claim 1, which is characterized in that the arc detecting device further includes：
Full-wave rectification block carries out reverse phase processing for the negative half-cycle signal to amplified sampled signal；The full-wave rectification
The signal input part of module is connect with the signal output end of the amplifier module, the signal output of the full-wave rectification block
End is connect with the signal input part of the signal processing module；
Correspondingly, the signal processing module is used to be determined whether according to reverse phase treated sampled signal processing costs and preset value
There are arcings.
4. arc detecting device as claimed in claim 2, which is characterized in that the amplifier module includes signal sampling mould
The signal output end of block and amplification module, the signal sampling module is connect with the signal input part of the amplification module；Wherein,
Signal sampling module to the current signal of resistive load for being sampled to obtain sampled signal；Amplification module by described for adopting
Sample signal, which is amplified to the signal processing module, can distinguish arcing critical point voltage and reference voltage range.
5. arc detecting device as described in claim 1, which is characterized in that the signal processing module includes analog-to-digital conversion mould
Block and processor, the signal input part of the analog-to-digital conversion module are connect with the signal output end of the amplification module, the mould
The signal output end of number conversion module is connect with the signal input part of the processor；Correspondingly, the amplifier module is used
Arcing critical point voltage and reference voltage range can be distinguished in the sampled signal is amplified to the analog-to-digital conversion module.
6. arc detecting device as claimed in claim 5, which is characterized in that after the signal processing module is according to amplification is compared
Sampled signal processing costs and preset value determine whether there is one of arcing, including following manner：
Arcing is determined whether there is according to more amplified sampled signal and reference voltage range；
According to slope is compared and default slope range determines whether there is arcing, the slope is amplified when time sampled signal
With the slope of sampled signal several times before time sampled signal；
According to difference is compared and preset difference value range determines whether there is arcing, the difference is amplified when time sampled signal
With the difference of sampled signal several times before time sampled signal.
7. arc detecting device as claimed in claim 6, which is characterized in that after the signal processing module is according to amplification is compared
Sampled signal and preset reference voltage range determine whether there is arcing, including：
When loading in running order, when N number of voltage sample value of continuous acquisition is respectively positioned in the reference voltage range, really
Recognize and detects an arcing；Wherein N is preset first amount threshold.
8. arc detecting device as claimed in claim 7, which is characterized in that the arc detecting device further includes：Alarm and
Or load switching off device, for when the signal processing module is consecutively detected M arcing, carrying out arcing alarm and/or inciting somebody to action
Load is disconnected with power supply；Wherein M is preset second amount threshold.
9. arc detecting device as claimed in claim 8, which is characterized in that the signal processing module is additionally operable to described in determination
Whether resistive load is in operating status.
10. arc detecting device as claimed in claim 9, which is characterized in that the signal processing module confirms described resistive
Whether load is in operating status, including：
When R voltage sample value of the analog-to-digital conversion module continuous acquisition is all higher than predetermined voltage threshold, at the signal
It manages module and confirms that the resistive load is in operating status；Wherein R is preset third amount threshold.
11. arc detecting device as claimed in claim 10, which is characterized in that the signal processing module confirms described resistive
Whether load is in operating status, further includes：
When S voltage sample value of the analog-to-digital conversion module continuous acquisition is respectively positioned on the reference voltage range, the letter
Number processing module confirms that the load is in halted state, and will be reset for the counting of wherein M and N；Wherein S is preset the
Four amount thresholds.
12. the arc detecting device as described in claim 1-11 any one, which is characterized in that the arcing critical point voltage
Voltage value previously according to following manner obtain：
The lasting minimum duration T that load current is zero during the arcing that predetermined needs identify；
According to formulaDetermine the phase of arcing critical point voltage；
According to formula UA=U0Sin θ determines the voltage value of arcing critical point voltage；
Wherein, θ is the phase angle of arcing critical point voltage, T0For alternating current voltage period, UAFor the voltage of arcing critical point voltage
Value, U0For alternating current voltage peak value.
13. arc detecting device as claimed in claim 4, which is characterized in that the amplification module and the direct current biasing mould
Block is realized by the way that operational amplifier is isolated.
14. arc detecting device as claimed in claim 4, which is characterized in that the signal sampling module includes Current Mutual Inductance
Device.
15. arc detecting device as described in claim 1, which is characterized in that the resistive load includes electrical heating elements.
16. a kind of electrical equipment, which is characterized in that the electrical equipment includes：
Power end,
The resistive load being connect with the power end, and,
The arcing detection as described in claim 1 to 15 any one being set between the power end and the resistive load
Device.
17. electrical equipment as claimed in claim 16, which is characterized in that the electrical equipment includes electric heater, the resistance
Property load include the electric heater electrical heating elements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721686161.6U CN207703970U (en) | 2017-12-07 | 2017-12-07 | Electrical equipment and its arc detecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721686161.6U CN207703970U (en) | 2017-12-07 | 2017-12-07 | Electrical equipment and its arc detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207703970U true CN207703970U (en) | 2018-08-07 |
Family
ID=63025034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721686161.6U Active CN207703970U (en) | 2017-12-07 | 2017-12-07 | Electrical equipment and its arc detecting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207703970U (en) |
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2017
- 2017-12-07 CN CN201721686161.6U patent/CN207703970U/en active Active
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