CN206002615U - Home appliance and be used for its fault arc detection device - Google Patents
Home appliance and be used for its fault arc detection device Download PDFInfo
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- CN206002615U CN206002615U CN201620910253.7U CN201620910253U CN206002615U CN 206002615 U CN206002615 U CN 206002615U CN 201620910253 U CN201620910253 U CN 201620910253U CN 206002615 U CN206002615 U CN 206002615U
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Abstract
The utility model discloses a kind of home appliance and be used for its fault arc detection device, wherein, fault arc detection device includes：Filtering protection location, described filtering protection location includes CLC filter circuit, and described filtering protection location is connected with electrical network to carry out attenuation processing by described CLC filter circuit to the arc signal in described electrical network；Load current detection unit, described load current detection unit be connected to described filtering protection location outfan, described load current detection unit in order to detect described home appliance load actual motion electric current to generate current detection signal；Control unit, described control unit is connected with described load current detection unit, and described control unit judges whether fault electric arc according to described current detection signal.This fault arc detection device passes through the electric arc interference signal from electrical network for the shielding, thus the arc signal that only detection backend load produces, is prevented effectively from misoperation.
Description
Technical field
This utility model is related to household electrical appliance technical field, particularly to a kind of detection of fault electric arc for home appliance
Device and a kind of home appliance.
Background technology
Fault electric arc is dangerous and multiple electric fault.Electric wiring and electrical equipment, once through long mistake
Load operation or situations such as there is bad electrical connection, can lead to insulating barrier to occur aging or damaged, this may draw
Send out arc fault.When there is arc fault, only the arc current of 2-10A is at short notice just enough to produce 2000-4000 DEG C
Localized hyperthermia, therefore, arc fault can bring more serious potential safety hazard to electrical equipment.
Wherein, electrical equipment once breaks down electric arc, and the high frequency of 200-400kHz occurs in its running current waveform
Noise, in addition some load also result in current waveform occur flat shoulder.Current main flow detection meanss are by identifying electric current
High fdrequency components in waveform carry out failure judgement electric arc, once electrical network near the arc phenomenon however, equipment breaks down, this equipment
All can there is electric arc high-frequency noise in current waveform, thus being difficult to the source of generation of failure judgement electric arc, can lead to its in electrical network
He makees equipment malfunction, makes troubles to user.And, the sample circuit not only high cost at present current waveform sampled,
Real-time, reliability and accuracy are also inadequate.
Utility model content
This utility model is intended at least solve one of technical problem in above-mentioned technology to a certain extent.For this reason, this reality
It is to propose a kind of fault arc detection device for home appliance with first new purpose, electrical network is derived from by shielding
Electric arc interference signal, thus only detection backend load produce arc signal, be prevented effectively from misoperation.
Second purpose of the present utility model is to propose a kind of home appliance.
For reaching above-mentioned purpose, the utility model proposes a kind of fault arc detection device for home appliance, bag
Include：Filtering protection location, described filtering protection location includes CLC filter circuit, described filtering protection location be connected with electrical network with
Attenuation processing is carried out to the arc signal in described electrical network by described CLC filter circuit；Load current detection unit, described negative
Carry the outfan that current detecting unit is connected to described filtering protection location, described load current detection unit is described in order to detect
The actual motion electric current of the load of home appliance is to generate current detection signal；Control unit, described control unit is negative with described
Carry current detecting unit to be connected, described control unit judges whether fault electric arc according to described current detection signal.
According to the utility model proposes the fault arc detection device for home appliance, by filter protection location in
CLC π type second-order low-pass filter circuit the arc signal in electrical network is carried out with attenuation processing, the electric arc in maskable external electrical network
Signal, just can't detect extraneous electricity during the actual motion electric current of load so detecting home appliance in load current detection unit
Arc signal in net, thus the arc signal that only detection backend load produces is judging whether fault electric arc, without
Affected by electrical network, and then be effectively prevented home appliance misoperation, reduced the impact to user.
Wherein, described CLC filter circuit includes：First X electric capacity, a described X electric capacity is connected in parallel on the zero line of described electrical network
And live wire between；First differential mode inductance, one end of described first differential mode inductance is connected with one end of a described X electric capacity；2nd X
Electric capacity, described 2nd X capacitance connection between the other end and the other end of a described X electric capacity of described first differential mode inductance,
The two ends of described 2nd X electric capacity are as the outfan of described filtering protection location.
And, described filtering protection location also includes the varistor for preventing surge, described varistor is connected in parallel on
Between the zero line of described electrical network and live wire and in parallel with a described X electric capacity.
Further, the described fault arc detection device for home appliance also includes：Controllable switch unit, described
Controllable switch unit is connected between described electrical network and described filtering protection location, the described filtering outfan of protection location and institute
State load to be connected, the control end of described controllable switch unit is connected with described control unit, wherein, exist in described fault electric arc
When, described control unit also controls described controllable switch unit to be off, so that described home appliance power-off.
Wherein, described controllable switch unit includes relay, and described relay includes dropout portion and control coil, described de-
Buckle connects live wire and the zero line of described electrical network respectively, and described control coil is connected with described control unit, wherein, described dropout
Portion is normally-closed contact.
Specifically, described load current detection unit includes current transformer, inspection leakage resistance or Hall current detection chip.
And, the described fault arc detection device for home appliance also includes：Switching Power Supply, described Switching Power Supply
Input be connected to described filtering protection location outfan, the outfan of described Switching Power Supply and described control unit phase
Even, described Switching Power Supply is used for providing unidirectional current to described control unit.
Alternatively, described fault arc detection device can be integrated among the plug of described home appliance.
Additionally, this utility model also proposed a kind of home appliance, it includes the above-mentioned fault electricity for home appliance
Arc detection means.
Home appliance of the present utility model, by above-mentioned fault arc detection device, the electricity in maskable external electrical network
Arc signal, just can't detect the external world during actual motion electric current of load so detecting home appliance in load current detection unit
Arc signal in electrical network, thus the arc signal that only detection backend load produces is judging whether fault electric arc, and not
Can be affected by electrical network, and then be effectively prevented from misoperation, be reduced the impact to user.
Brief description
Fig. 1 is the circuit side of the fault arc detection device for home appliance according to one embodiment of this utility model
Block diagram；
Fig. 2 is the circuit according to another embodiment of this utility model for the fault arc detection device of home appliance
Block diagram；
Fig. 3 is the circuit according to another embodiment of this utility model for the fault arc detection device of home appliance
Block diagram；
Fig. 4 is the circuit diagram of the load current detection unit according to one embodiment of this utility model；
Fig. 5 is the circuit according to this utility model a still further embodiment for the fault arc detection device of home appliance
Block diagram；
Fig. 6 is the circuit diagram of the load current detection unit according to another embodiment of this utility model；
Fig. 7 is the circuit according to this utility model further embodiment for the fault arc detection device of home appliance
Block diagram；
Fig. 8 is the circuit diagram of the load current detection unit according to this utility model a still further embodiment；And
Fig. 9 is the flow chart according to this utility model embodiment for the fault arc detection method of home appliance.
Specific embodiment
Embodiment of the present utility model is described below in detail, the example of described embodiment is shown in the drawings, wherein ad initio
To the element that same or similar label represents same or similar element or has same or like function eventually.Below by ginseng
The embodiment examining Description of Drawings is exemplary it is intended to be used for explaining this utility model, and it is not intended that to this utility model
Restriction.
The fault electric arc inspection for home appliance being proposed according to this utility model embodiment to be described with reference to the accompanying drawings
Survey device, the fault arc detection method for home appliance and the home appliance with this fault arc detection device.
Fig. 1 is the circuit side of the fault arc detection device for home appliance according to one embodiment of this utility model
Block diagram.As shown in figure 1, the fault arc detection device that this is used for home appliance includes power network current detector unit 20, filtering is protected
Shield unit 30, load current detection unit 50 and control unit 60.
Wherein, power network current detector unit 20 is connected to the power supply end of home appliance, power network current detector unit 20
Flow into the electric current of home appliance for detection from electrical network to generate the first current detection signal.Filtering protection location 30 front end with
Power network current detector unit 20 is connected, and filtering protection location 30 is used for carrying out attenuation processing to the arc signal in electrical network.Load
The rear end of current detecting unit 50 is connected with load 70, and load current detection unit 50 is used for detecting the reality of the load of home appliance
Border running current is to generate the second current detection signal.Control unit 60 respectively with power network current detector unit 20 and load current
Detector unit 50 is connected, and control unit 60 is used for the first current detection signal and the second current detection signal being identified and comparing
Relatively with the source of generation of failure judgement electric arc, still it is derived from internal bearing such that it is able to judge that fault electric arc is derived from external electrical network
Carry, be prevented effectively from misoperation.
In an example of the present utility model, control unit 60 can for MCU (Micro Controller Unit, micro-
Controller).
According to an embodiment of the present utility model, control unit 60 such as MCU is further used for being examined according to the first electric current
Survey signal identification to the first arc signal, and the second arc signal is recognized according to the second current detection signal, wherein, first
When the intensity of arc signal is more than the intensity of the second arc signal, control unit 60 failure judgement electric arc is produced by electrical network；?
When the intensity of one arc signal is less than the intensity of the second arc signal, control unit 60 failure judgement electric arc is by loading generation.
That is, control unit 60 current waveform from electrical network that power network current detector unit 20 is detected and load
The current waveform from internal load of current detecting unit 50 detection is compared, if power network current detector unit 20 detects
The current waveform from electrical network in the electric current from internal load that detects than load current detection unit 50 of arc signal
Arc signal in waveform is strong, then failure judgement electric arc is produced by external electrical network, conversely, then failure judgement electric arc is by internal load
Produce, therefore, it can be accurately judged to the source of generation of fault electric arc.
According to an embodiment of the present utility model, as shown in figure 1, the above-mentioned fault electric arc detection for home appliance
Device also includes：Controllable switch unit 10, one end of controllable switch unit 10 is used for connecting electrical network, controllable switch unit 10 another
One end is connected with the input of filtering protection location 30, and the outfan of filtering protection location 30 is connected with load 70, gate-controlled switch
The control end of unit 10 is connected with control unit 60, and wherein, when fault electric arc is by loading generation, control unit 60 also controls can
Control switch element 10 is off, so that home appliance power-off is it is ensured that the safety of home appliance.
And, as shown in figure 1, controllable switch unit 10 includes relay, relay includes dropout portion and control coil, take off
Buckle connects the live wire L and zero line N of electrical network respectively, and control coil is connected with control unit 60, and wherein, dropout portion is normally closed touching
Point.That is, relay is closed type relay.
In embodiment of the present utility model, filtering protection location 30 includes low pass filter, primarily serves low-pass filtering
Effect, low pass filter can be any in LC filter circuit, LCL filter circuit, CLC filter circuit or CLLC filter circuit
A kind of.
Wherein, filtering protection location 30 also includes the varistor for preventing surge, such that it is able to prevent fault electric arc
Detection means is not damaged by surge.
According to an embodiment of the present utility model, as shown in figure 1, the above-mentioned fault electric arc detection for home appliance
Device also includes Switching Power Supply 40, and the input of Switching Power Supply 40 is connected to the outfan of filtering protection location 30, Switching Power Supply
40 outfan is connected with control unit 60, and Switching Power Supply 40 realizes AC/DC conversion, for providing direct current to control unit 60
Electricity.
In embodiment of the present utility model, above-mentioned fault arc detection device can be integrated in home appliance plug it
In, thus convenient design.Wherein, home appliance can be air-conditioner.
According to this utility model embodiment for the fault arc detection device of home appliance, detected by power network current
Unit detection flows into the electric current of home appliance to generate the first current detection signal from electrical network, and by filtering protection location to electricity
Arc signal in net carries out attenuation processing, and the actual fortune detecting the load of home appliance by load current detection unit
Row electric current, to generate the second current detection signal, so passes through control unit to the first current detection signal and the second current detecting
Signal is identified and compares, i.e. contrast is derived from the actual motion current wave of the current waveform of electrical network and the load of home appliance
Shape, such that it is able to the source of generation of accurate failure judgement electric arc, you can judge that fault electric arc is that external electrical network produces or interior
Section load produces, and then is effectively prevented home appliance misoperation, reduces the impact to user.
Specifically, according to an embodiment of the present utility model, as shown in figure 1, the low pass filtered in filtering protection location 30
Ripple device adopts CLLC filter circuit, and varistor is connected in parallel on the input of CLLC filter circuit.Say, the present embodiment for family
The fault arc detection device of electric equipment includes filtering protection location 30, power network current detector unit 20, load current detection list
Unit 50, control unit 60, controllable switch unit 10, Switching Power Supply 40.
Wherein, the dropout portion in controllable switch unit 10 is connected with the zero line N of electrical network, live wire L, and dropout portion is normally closed touching
Point, control coil is connected with control unit 60, and when fault electric arc is detected by loading generation, control unit 60 gives control coil
Power supply, dropout portion works, and disconnects zero line, live wire, and home appliance such as air-conditioner power-off is it is ensured that home appliance safety.
As shown in figure 1, the rear end in dropout portion is connected with power network current detector unit 20, power network current detector unit 20 detects
Flow into the current waveform of home appliance from electrical network, the front end of filtering protection location 30 is input and power network current detector unit 20
Connect, the rear end of filtering protection location 30 is that outfan is connected with Switching Power Supply 40 and load current detection unit 50, load electricity
The rear end of stream detector unit 50 is connected with load 70, and load current detection unit 50 is used for the actual motion current wave of detection load
Shape.The outfan of Switching Power Supply 40 connects control unit 60, is that control unit 60 is powered, power network current detector unit 20 and load
Current detecting unit 50 connects control unit 60 respectively, and control unit 60 can be gathered by ADC and obtain two-way current signal.
As shown in figure 1, filtering protection location 30 acts primarily as low-pass filtering effect, it is not only able to improve the steady of Switching Power Supply 40
Qualitative, and can decay flow through filtering protection location 30 hf electric arc signal the arc signal from electrical network is decayed
Process.Control unit 60 is passed through to contrast the current waveform of power network current detector unit 20 and load current detection unit 50 detection,
Can failure judgement electric arc be accurately just to produce or internal load generation in external electrical network.Wherein, if examined by power network current
In the current waveform of survey unit 20 detection, arc signal is stronger than detect from load current detection unit 50, then may determine that fault
Electric arc is to be produced by external electrical network, otherwise then produces for load-side, therefore, it can the source of generation of accurate failure judgement electric arc,
Thus being effectively prevented home appliance misoperation, reduce the impact to user.
According to another embodiment of the present utility model, as shown in Fig. 2 this is used for the fault electric arc detection dress of home appliance
Put including filtering protection location 30, load current detection unit 50 and control unit 60, filtering protection location 30 includes CLLC filter
Wave circuit, filtering protection location 30 is connected with electrical network to be carried out at decay to the arc signal in electrical network by CLLC filter circuit
Reason, that is, say, CLLC high-order lowpass filter circuit is used for the electric arc interference signal in electrical network.
Load current detection unit 50 be connected to filtering protection location 30 outfan, load current detection unit 50 in order to
The actual motion electric current of the load 70 of detection home appliance is the second above-mentioned current detection signal to generate current detection signal.
Control unit 60 is connected with load current detection unit 50, and control unit 60 judges whether fault according to current detection signal
Electric arc.
According to this utility model embodiment for home appliance fault arc detection device, by filter protection location
In CLLC high-order lowpass filter circuit the arc signal in electrical network is carried out with attenuation processing, the electric arc in maskable external electrical network
Signal, just can't detect extraneous electricity during the actual motion electric current of load so detecting home appliance in load current detection unit
Arc signal in net, thus the arc signal that only detection backend load produces is judging whether fault electric arc, without
Affected by electrical network, and then be effectively prevented home appliance misoperation, reduced the impact to user.
Wherein, as shown in Fig. 2 CLLC filter circuit includes：First X electric capacity C1, the first differential mode inductance L1, the second differential mode electricity
Sense L2 and the 2nd X electric capacity C2.First X electric capacity C1 is connected in parallel between the zero line N of electrical network and live wire L, and the one of the first differential mode inductance L1
End is connected with one end of an X electric capacity C1, and one end of the second differential mode inductance L2 is connected with the other end of an X electric capacity C1, the 2nd X
Electric capacity C2 is connected between the other end of the first differential mode inductance L1 and the other end of the second differential mode inductance L2, the 2nd X electric capacity C2's
Two ends are as the outfan of filtering protection location 30.
And, filtering protection location 30 also includes the varistor ZR1 for preventing surge, varistor ZR1 is connected in parallel on
Between the zero line of electrical network and live wire and in parallel with an X electric capacity C1.That is, the input of varistor ZR1 parallel connection CLLC filter circuit
End.
In an embodiment of the present utility model, as shown in Fig. 2 this is used for the fault arc detection device of home appliance
Also include：Controllable switch unit 10, controllable switch unit 10 is connected between electrical network and filtering protection location 30, and filtering protection is single
The outfan of unit 30 is connected with load 70, and the control end of controllable switch unit 10 is connected with control unit 60, wherein, in fault electricity
In the presence of arc, control unit 60 also controls controllable switch unit 10 to be off, so that home appliance power-off, household electrical appliances is set
Standby protected.
As shown in Fig. 2 controllable switch unit 10 includes relay, described relay includes dropout portion and control coil, institute
State live wire and the zero line that dropout portion connects described electrical network respectively, described control coil is connected with described control unit, wherein, described
Dropout portion is normally-closed contact.
Specifically, in an embodiment of the present utility model, as shown in Fig. 2 this is used for the fault electric arc of home appliance
Detection means includes controllable switch unit 10, filtering protection location 30, Switching Power Supply 40, load current detection unit 50 and controls
Unit 60.Wherein, the dropout portion in controllable switch unit 10 is connected with the zero line N of electrical network, live wire L, and dropout portion is normally-closed contact,
Control coil is connected with control unit 60.The front end of filtering protection location 30 is that input is connected with dropout portion, and filtering protection is single
The rear end of unit 30 is that outfan is connected with Switching Power Supply 40 and load current detection unit 50, and filtering protection location 30 is used for filtering
Electric arc interference signal in electrical network, not only ensures Switching Power Supply 40 steady operation, and prevents load current detection unit 50 to examine
Measure the arc signal in electrical network.
As shown in Fig. 2 the outfan of Switching Power Supply 40 connects control unit 60, it is that control unit 60 is powered, load current
Detector unit 50 connects control unit 60, and the rear end of load current detection unit 50 connects load 70, and control unit 60 passes through ADC
Acquisition port gathers load current signal, and be whether there is come failure judgement electric arc by analyzing current waveform, when fault electric arc is deposited
During the generation by load in sight, control unit 60 is powered to control coil, and dropout portion works, and disconnects zero line, live wire, home appliance example
As air-conditioner power-off it is ensured that home appliance safety.
Wherein, filtering protection location 30 adopts CLLC high-order lowpass filter circuit.As shown in Fig. 2 filtering protection location 30
Including：Varistor ZR1, X electric capacity C1 and C2, differential mode inductance L1 and L2, varistor ZR1 protects fault arc detection device not
Damaged by surge, X electric capacity C1 and C2, differential mode inductance L1 and L2 constitute CLLC filter circuit, effectively filter the electric arc letter in electrical network
Number.
Therefore, the fault arc detection device for home appliance of the present embodiment, filtering protection location 30 adopts CLLC
Filter circuit, can effectively filter the electric arc interference signal in electrical network, ensure that the arc signal that only detection backend load produces,
Without by electric network influencing, being effectively prevented home appliance misoperation, reduce the impact to user.
According to another embodiment of the present utility model, as shown in figure 3, this is used for the fault electric arc detection dress of home appliance
Put including filtering protection location 30, load current detection unit 50 and control unit 60, filtering protection location 30 includes CLC filtering
Circuit, filtering protection location 30 is connected to carry out attenuation processing by CLC filter circuit to the arc signal in electrical network with electrical network,
Say, CLC π type second-order low-pass filter circuit is used for the electric arc interference signal in electrical network.
Load current detection unit 50 be connected to filtering protection location 30 outfan, load current detection unit 50 in order to
The actual motion electric current of the load 70 of detection home appliance is the second above-mentioned current detection signal to generate current detection signal.
Control unit 60 is connected with load current detection unit 50, and control unit 60 judges whether fault according to current detection signal
Electric arc.
According to this utility model embodiment for home appliance fault arc detection device, by filter protection location
In CLC π type second-order low-pass filter circuit the arc signal in electrical network is carried out with attenuation processing, the electricity in maskable external electrical network
Arc signal, just can't detect the external world during actual motion electric current of load so detecting home appliance in load current detection unit
Arc signal in electrical network, thus the arc signal that only detection backend load produces is judging whether fault electric arc, and not
Can be affected by electrical network, and then be effectively prevented home appliance misoperation, be reduced the impact to user.
Wherein, as shown in figure 3, CLC filter circuit includes：First X electric capacity C1, the first differential mode inductance L1 and the 2nd X electric capacity
C2.First X electric capacity C1 is connected in parallel between the zero line N of electrical network and live wire L, one end of the first differential mode inductance L1 and an X electric capacity C1
One end be connected, the 2nd X electric capacity C2 is connected between the other end of the first differential mode inductance L1 and the other end of an X electric capacity C1,
The two ends of the 2nd X electric capacity C2 are as the outfan of filtering protection location 30.
And, filtering protection location 30 also includes the varistor ZR1 for preventing surge, varistor ZR1 is connected in parallel on
Between the zero line of electrical network and live wire and in parallel with an X electric capacity C1.That is, the input of varistor ZR1 parallel connection CLLC filter circuit
End.
In an embodiment of the present utility model, as shown in figure 3, this is used for the fault arc detection device of home appliance
Also include：Controllable switch unit 10, controllable switch unit 10 is connected between electrical network and filtering protection location 30, and filtering protection is single
The outfan of unit 30 is connected with load 70, and the control end of controllable switch unit 10 is connected with control unit 60, wherein, in fault electricity
In the presence of arc, control unit 60 also controls controllable switch unit 10 to be off, so that home appliance power-off, household electrical appliances is set
Standby protected.
As shown in figure 3, controllable switch unit 10 includes relay, described relay includes dropout portion and control coil, institute
State live wire and the zero line that dropout portion connects described electrical network respectively, described control coil is connected with described control unit, wherein, described
Dropout portion is normally-closed contact.
Specifically, in an embodiment of the present utility model, as shown in figure 3, this is used for the fault electric arc of home appliance
Detection means includes controllable switch unit 10, filtering protection location 30, Switching Power Supply 40, load current detection unit 50 and controls
Unit 60.Wherein, the dropout portion in controllable switch unit 10 is connected with the zero line N of electrical network, live wire L, and dropout portion is normally-closed contact,
Control coil is connected with control unit 60.The front end of filtering protection location 30 is that input is connected with dropout portion, and filtering protection is single
The rear end of unit 30 is that outfan is connected with Switching Power Supply 40 and load current detection unit 50, and filtering protection location 30 is used for filtering
Electric arc interference signal in electrical network, not only ensures Switching Power Supply 40 steady operation, and prevents load current detection unit 50 to examine
Measure the arc signal in electrical network.
As shown in figure 3, the outfan of Switching Power Supply 40 connects control unit 60, it is that control unit 60 is powered, load current
Detector unit 50 connects control unit 60, and the rear end of load current detection unit 50 connects load 70, and control unit 60 passes through ADC
Acquisition port gathers load current signal, and be whether there is come failure judgement electric arc by analyzing current waveform, when fault electric arc is deposited
During the generation by load in sight, control unit 60 is powered to control coil, and dropout portion works, and disconnects zero line, live wire, home appliance example
As air-conditioner power-off it is ensured that home appliance safety.
Therefore, the fault arc detection device for home appliance of the present embodiment, effective by filtering protection location 30
Filter the electric arc interference signal in electrical network, ensure that the arc signal that only detection backend load produces, without by electrical network shadow
Ring, be effectively prevented home appliance misoperation, reduce the impact to user.
Wherein, filtering protection location 30 is also using CLC π type second-order low-pass filter circuit.As shown in figure 3, filtering protection
Unit 30 includes：Varistor ZR1, X electric capacity C1 and C2, differential mode inductance L1, varistor ZR1 protects fault arc detection device
Do not damaged by surge, X electric capacity C1 and C2, differential mode inductance L1 constitute CLC filter circuit, effectively filter the arc signal in electrical network.
And, load current detection unit 50 should detect the electric current of differential mode inductance L1 branch road.
According to an embodiment of the present utility model, the electricity of power network current detector unit 20 and load current detection unit 50
Line structure can be identical.Wherein, load current detection unit 50 may include current transformer, inspection leakage resistance or Hall current detection core
Piece.
Specifically, in an embodiment of the present utility model, when load current detection unit 50 adopts current transformer,
Include filtering protection location 30, load electricity in conjunction with the fault arc detection device that as shown in Figure 2 and Figure 4, this is used for home appliance
Stream detector unit 50, control unit 60, controllable switch unit 10 and Switching Power Supply 40.Wherein, as shown in Fig. 2 gate-controlled switch list
Dropout portion front end in unit 10 is connected with the zero line N of electrical network, live wire L, and dropout portion is normally-closed contact, control coil and control unit
60 connections.The front end of filtering protection location 30 is that input is connected with dropout portion, and the rear end of filtering protection location 30 is outfan
It is connected with Switching Power Supply 40 and load current detection unit 50, filtering protection location 30 is used for filtering the electric arc interference letter in electrical network
Number, not only ensure Switching Power Supply 40 steady operation, and prevent load current detection unit 50 from the electricity in electrical network is detected
Arc signal.
As shown in Fig. 2 the outfan of Switching Power Supply 40 connects control unit 60, it is that control unit 60 is powered, load current
Detector unit 50 connects control unit 60, and the rear end of load current detection unit 50 connects load 70, and control unit 60 passes through ADC
Acquisition port gathers load current signal, and be whether there is come failure judgement electric arc by analyzing current waveform, when fault electric arc is deposited
During the generation by load in sight, control unit 60 is powered to control coil, and dropout portion works, and disconnects zero line, live wire, home appliance example
As air-conditioner power-off it is ensured that home appliance safety.
Therefore, the fault arc detection device for home appliance of the present embodiment, effective by filtering protection location 30
Filter the electric arc interference signal in electrical network, ensure that the arc signal that only detection backend load produces, without by electrical network shadow
Ring, be effectively prevented home appliance misoperation, reduce the impact to user.
Further, as shown in figure 4, load current detection unit 50 includes：Current transformer 501, the first filter capacitor
C10, the second filter capacitor C20, sampling resistor R0, the first divider resistance R1, the second divider resistance R2, the 3rd filter capacitor C30,
4th filter capacitor C40.Wherein, the wire of current transformer 501 is serially connected on power line such as live wire L, and induction coil is in parallel
Second filter capacitor C20, sampling resistor R0 are in parallel with the second filter capacitor C20；Second filter capacitor C20 is used for filtering hyperfrequency
Interference, sampling resistor R0 is converted into voltage signal the electric current on power line, and the 4th filter capacitor C40 filters default power supply VCC
High-frequency Interference；The big I of resistance of the first divider resistance R1 and the second divider resistance R2 is identical, be connected on default power supply VCC and
Between ground, then the middle part voltage of the first divider resistance R1 and the second divider resistance R2 is VCC/2, through the 3rd filter capacitor C30
Connect one end of induction coil, be used for raising current waveform profile, so that the ADC collection of control unit 60 such as MCU, the first filter
Ripple electric capacity C10 is connected to the other end of induction coil, and the ADC acquisition port near MCU, for filter high-frequency interference.
Therefore, the fault arc detection device for home appliance of the present embodiment, is capable of by current transformer
The actual motion electric current of load is sampled, in real time, accurately, reliable, stable, gather current waveform at low cost, and pass through
Control unit 60 is analyzed to the electric wave signal of collection, thus the arc signal that only detection backend load produces, effectively keeps away
Exempt from home appliance misoperation.
In another embodiment of the present utility model, when load current detection unit 50 is using inspection leakage resistance, in conjunction with such as
Shown in Fig. 5 and Fig. 6, the fault arc detection device that this is used for home appliance includes filtering protection location 30, load current detection
Unit 50, control unit 60, controllable switch unit 10 and Switching Power Supply 40.Wherein, as shown in figure 5, in controllable switch unit 10
Dropout portion front end be connected with the zero line N of electrical network, live wire L, dropout portion is normally-closed contact, and control coil and control unit 60 are even
Connect.The front end of filtering protection location 30 is that input is connected with dropout portion, and the rear end filtering protection location 30 is outfan and open
Close power supply 40 and load current detection unit 50 connect, filtering protection location 30 is used for filtering the electric arc interference signal in electrical network,
Not only ensure Switching Power Supply 40 steady operation, and prevent load current detection unit 50 from the letter of the electric arc in electrical network is detected
Number.
As shown in figure 5, the outfan of Switching Power Supply 40 connects control unit 60, it is that control unit 60 is powered, load current
Detector unit 50 connects control unit 60, and the rear end of load current detection unit 50 connects load 70, and control unit 60 passes through ADC
Acquisition port gathers load current signal, and be whether there is come failure judgement electric arc by analyzing current waveform, when fault electric arc is deposited
During the generation by load in sight, control unit 60 is powered to control coil, and dropout portion works, and disconnects zero line, live wire, home appliance example
As air-conditioner power-off it is ensured that home appliance safety.
Therefore, the fault arc detection device for home appliance of the present embodiment, effective by filtering protection location 30
Filter the electric arc interference signal in electrical network, ensure that the arc signal that only detection backend load produces, without by electrical network shadow
Ring, be effectively prevented home appliance misoperation, reduce the impact to user.
Further, as shown in fig. 6, load current detection unit 50 includes：Inspection leakage resistance Rs, the first common mode filtering resistance
R10, the second common mode filtering resistance R20, common mode filtering electric capacity C0, the first differential mode filter capacitor C100, the second differential mode filter capacitor
C200, difference isolated amplifier 502, the 4th filter capacitor C40 and the first filter capacitor C10.Wherein, examine leakage resistance Rs for example no
Sensing resistor is connected on power line such as live wire L, the resistance very little of inspection leakage resistance Rs, typically 5m Ω～50m Ω may be selected, when having
When electric current flows through inspection leakage resistance Rs, inspection leakage resistance Rs both sides can produce small pressure reduction；Inspection leakage resistance Rs both sides pass through common mode respectively
Filter resistance R10, common mode filtering resistance R20 and common mode filtering electric capacity C0, differential mode filter capacitor C100, differential mode filter capacitor
C200 connects to VINP the and VINN pin of difference isolated amplifier 502, wherein, the first common mode filtering resistance R10, second altogether
Mould filter resistance R20, the value of common mode filtering electric capacity C0, the first differential mode filter capacitor C100 and the second differential mode filter capacitor C200
Should be as far as possible little, otherwise sample waveform can serious distortion.
In an embodiment of the present utility model, if during PCB fabric swatch, difference isolated amplifier 502 can lean on very much
Nearly inspection leakage resistance Rs, then it is contemplated that removing these filtering devices above-mentioned.
As shown in fig. 6, the 4th filter capacitor C40 is connected between default power supply VCC and ground, difference isolated amplifier 502
VDD1 and VDD2 pin meets default power supply VCC, and the VOUTP pin of difference isolated amplifier 502 connects control unit 60 such as MCU's
ADC acquisition port, in the first filter capacitor C10 in parallel at ADC acquisition port, for filter high-frequency interference, difference isolation is amplified
GND1 the and GND2 pin ground connection of device 502.
Therefore, the fault arc detection device for home appliance of the present embodiment, it is right to be capable of by inspection leakage resistance
The actual motion electric current of load is sampled, in real time, accurately, reliable, stable, gather current waveform at low cost, and by control
Unit 60 processed is analyzed to the electric wave signal of collection, thus the arc signal that only detection backend load produces, is effectively prevented from
Home appliance misoperation.
In another embodiment of the present utility model, load current detection unit 50 adopts Hall current detection chip
When, include filtering protection location 30, load electricity in conjunction with the fault arc detection device that shown in Fig. 7 and Fig. 8, this is used for home appliance
Stream detector unit 50, control unit 60, controllable switch unit 10 and Switching Power Supply 40.Wherein, as shown in fig. 7, gate-controlled switch list
Dropout portion front end in unit 10 is connected with the zero line N of electrical network, live wire L, and dropout portion is normally-closed contact, control coil and control unit
60 connections.The front end of filtering protection location 30 is that input is connected with dropout portion, and the rear end of filtering protection location 30 is outfan
It is connected with Switching Power Supply 40 and load current detection unit 50, filtering protection location 30 is used for filtering the electric arc interference letter in electrical network
Number, not only ensure Switching Power Supply 40 steady operation, and prevent load current detection unit 50 from the electricity in electrical network is detected
Arc signal.
As shown in fig. 7, the outfan of Switching Power Supply 40 connects control unit 60, it is that control unit 60 is powered, load current
Detector unit 50 connects control unit 60, and the rear end of load current detection unit 50 connects load 70, and control unit 60 passes through ADC
Acquisition port gathers load current signal, and be whether there is come failure judgement electric arc by analyzing current waveform, when fault electric arc is deposited
During the generation by load in sight, control unit 60 is powered to control coil, and dropout portion works, and disconnects zero line, live wire, home appliance example
As air-conditioner power-off it is ensured that home appliance safety.
Therefore, the fault arc detection device for home appliance of the present embodiment, effective by filtering protection location 30
Filter the electric arc interference signal in electrical network, ensure that the arc signal that only detection backend load produces, without by electrical network shadow
Ring, be effectively prevented home appliance misoperation, reduce the impact to user.
Further, as shown in figure 8, load current detection unit 50 includes：Hall current detection chip the 503, the 5th is filtered
Ripple electric capacity C50, the first filter capacitor C10, the 4th filter capacitor C40.Wherein, IP- and IP+ of Hall current detection chip 503
Pin is serially connected on power line such as live wire L, and load current flows through the Hall element of chip internal.Hall current detection chip
503 VCC pin meets default power supply VCC, to chip power supply, the indirect 4th filter capacitor C40 on default power supply VCC and ground, and real
Existing power decoupling.5th filter capacitor C50 in parallel between the FIL of Hall current detection chip 503 and GND pin, realizes primary
Filtering.The OUT pin of Hall current detection chip 503 exports the voltage signal of 0.5V～(VCC-0.5V), instantaneous with collection
Current in proportion, during alternating current zero crossing, voltage is VCC/2, and this OUT pin is connected with the ADC acquisition port of control unit 60 such as MCU,
In the first filter capacitor C10 in parallel at ADC acquisition port, for filter high-frequency interference.
Therefore, the fault arc detection device for home appliance of the present embodiment, by Hall current detection chip energy
Enough realize the actual motion electric current of load is sampled, in real time, accurately, reliable, stable, gather current waveform at low cost,
And by control unit 60, the electric wave signal of collection is analyzed, thus the arc signal that only detection backend load produces, have
Avoid home appliance misoperation to effect.
Fig. 9 is the flow chart according to this utility model embodiment for the fault arc detection method of home appliance.Its
In, home appliance can be air-conditioner.As shown in figure 9, the fault arc detection method that this is used for home appliance includes following step
Suddenly：
S1, detection flows into the electric current of home appliance to generate the first current detection signal from electrical network.
Wherein, the current waveform flowing into home appliance from electrical network can be detected by power network current detector unit.
S2, is filtered to carry out decay to the arc signal in electrical network to the electric current flowing into home appliance from electrical network
Reason.
Wherein, by filtering protection location, the electric current flowing into home appliance from electrical network can be filtered processing.
S3, the actual motion electric current of the load of detection home appliance is to generate the second current detection signal.
Wherein, the actual motion current waveform of the load to home appliance can detect with load current detection unit.
S4, is identified to the first current detection signal and the second current detection signal and compares with failure judgement electric arc
Source of generation.
According to an embodiment of the present utility model, step S4 includes：Recognized according to described first current detection signal
First arc signal, and the second arc signal is recognized according to described second current detection signal；When described first arc signal
Intensity be more than described second arc signal intensity when, judge that described fault electric arc is produced by described electrical network；When described first
When the intensity of arc signal is less than the intensity of described second arc signal, judge that described fault electric arc is produced by described load.
That is, the electricity from electrical network in embodiment of the present utility model, to the detection of power network current detector unit
The current waveform from internal load of stream waveform and load current detection unit detection is compared, if power network current detection
Unit detection the current waveform from electrical network in arc signal than load current detection unit detect from internal load
Current waveform in arc signal strong, then failure judgement electric arc is produced by external electrical network, conversely, then failure judgement electric arc is by interior
Section load produces, and therefore, it can be accurately judged to the source of generation of fault electric arc.
And, when described fault electric arc is produced by described load, also control described home appliance power-off, thus ensureing house
The safety of electric equipment.
According to this utility model embodiment for home appliance fault arc detection method, by detection from electrical network stream
The electric current entering home appliance is to generate the first current detection signal with the actual motion electric current of the load of detection home appliance with life
Become the second current detection signal, wherein also attenuation processing is carried out to the arc signal in electrical network, so by examining to the first electric current
Survey signal and the second current detection signal is identified and compares, that is, contrast is from the current waveform of electrical network and bearing of home appliance
The actual motion current waveform carrying, such that it is able to the source of generation of accurate failure judgement electric arc, you can judge that fault electric arc is
External electrical network produces or internal load produces, and then is effectively prevented home appliance misoperation, reduces the impact to user.
Additionally, this utility model embodiment also proposed a kind of home appliance, it include above-mentioned for home appliance
Fault arc detection device.
The home appliance of this utility model embodiment, by above-mentioned fault arc detection device, maskable external electrical network
In arc signal, so load current detection unit detect home appliance load actual motion electric current when just detect not
Arc signal in extraneous electrical network, thus the arc signal that only detection backend load produces is electric to judge whether fault
Arc, without being affected by electrical network, and then is effectively prevented from misoperation, reduces the impact to user.
In description of the present utility model it is to be understood that term " " center ", " longitudinal ", " horizontal ", " length ", " width
Degree ", " thickness ", " on ", D score, "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom " " interior ", " outward ", " suitable
The orientation of instruction such as hour hands ", " counterclockwise ", " axial ", " radially ", " circumferential " or position relationship are based on orientation shown in the drawings
Or position relationship, be for only for ease of description this utility model and simplify description, rather than instruction or hint indication device or
Element must have specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to limit of the present utility model
System.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that indicating or hint relative importance
Or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can express or
Implicitly include at least one this feature.In description of the present utility model, " multiple " are meant that at least two, such as two
Individual, three etc., unless otherwise expressly limited specifically.
In this utility model, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection ", " Gu
Fixed " etc. term should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected or integral；Can be
It is mechanically connected or electrically connect；Can be to be joined directly together it is also possible to be indirectly connected to by intermediary, can be two
The connection of element internal or the interaction relationship of two elements, limit unless otherwise clear and definite.Common skill for this area
For art personnel, concrete meaning in this utility model for the above-mentioned term can be understood as the case may be.
In this utility model, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score
Can be the first and second feature directly contacts, or the first and second features pass through intermediary mediate contact.And, first is special
Levy second feature " on ", " top " and " above " but fisrt feature directly over second feature or oblique upper, or only
Represent that fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " permissible
Be fisrt feature immediately below second feature or obliquely downward, or be merely representative of fisrt feature level height and be less than second feature.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy describing with reference to this embodiment or example
Point is contained at least one embodiment of the present utility model or example.In this manual, the schematic table to above-mentioned term
State and be necessarily directed to identical embodiment or example.And, the specific features of description, structure, material or feature are permissible
Any one or more embodiments or example combine in an appropriate manner.Additionally, in the case of not conflicting, this area
Technical staff the feature of the different embodiments described in this specification or example and different embodiment or example can be entered
Row combines and combines.
Although of the present utility model embodiment has been shown and described above it is to be understood that above-described embodiment is
Exemplary it is impossible to be interpreted as that those of ordinary skill in the art is in scope of the present utility model to restriction of the present utility model
Interior above-described embodiment can be changed, change, replacing and modification.
Claims (9)
1. a kind of fault arc detection device for home appliance is it is characterised in that include：
Filtering protection location, described filtering protection location includes CLC filter circuit, described filtering protection location be connected with electrical network with
Attenuation processing is carried out to the arc signal in described electrical network by described CLC filter circuit；
Load current detection unit, described load current detection unit is connected to the outfan of described filtering protection location, described
Load current detection unit in order to detect described home appliance load actual motion electric current to generate current detection signal；
Control unit, described control unit is connected with described load current detection unit, and described control unit is according to described electric current
Detection signal judges whether fault electric arc.
2. it is used for the fault arc detection device of home appliance as claimed in claim 1 it is characterised in that described CLC filters
Circuit includes：
First X electric capacity, a described X electric capacity is connected in parallel between zero line and the live wire of described electrical network；
First differential mode inductance, one end of described first differential mode inductance is connected with one end of a described X electric capacity；
2nd X electric capacity, described 2nd X capacitance connection described first differential mode inductance the other end and a described X electric capacity another
Between one end, the two ends of described 2nd X electric capacity are as the described outfan filtering protection location.
3. it is used for the fault arc detection device of home appliance as claimed in claim 2 it is characterised in that described filtering is protected
Unit also includes the varistor for preventing surge, and described varistor is connected in parallel between zero line and the live wire of described electrical network,
And it is in parallel with a described X electric capacity.
4. the fault arc detection device for home appliance as any one of claim 1-3 is it is characterised in that go back
Including：
Controllable switch unit, described controllable switch unit is connected between described electrical network and described filtering protection location, described filter
The outfan of ripple protection location is connected with described load, and the control end of described controllable switch unit is connected with described control unit,
Wherein, in the presence of described fault electric arc, described control unit also controls described controllable switch unit to be off, so that
Described home appliance power-off.
5. it is used for as claimed in claim 4 the fault arc detection device of home appliance it is characterised in that described gate-controlled switch
Unit includes relay, and described relay includes dropout portion and control coil, and described dropout portion connects the fire of described electrical network respectively
Line and zero line, described control coil is connected with described control unit, and wherein, described dropout portion is normally-closed contact.
6. it is used for as claimed in claim 1 the fault arc detection device of home appliance it is characterised in that described load current
Detector unit includes current transformer, inspection leakage resistance or Hall current detection chip.
7. it is used for the fault arc detection device of home appliance as claimed in claim 1 it is characterised in that also including：
Switching Power Supply, the input of described Switching Power Supply is connected to the outfan of described filtering protection location, described Switching Power Supply
Outfan be connected with described control unit, described Switching Power Supply be used for described control unit provide unidirectional current.
8. it is used for as claimed in claim 1 the fault arc detection device of home appliance it is characterised in that described fault electric arc
Detection means can be integrated among the plug of described home appliance.
9. a kind of home appliance is it is characterised in that include the event for home appliance as any one of claim 1-8
Barrier electric arc detecting device.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620910253.7U CN206002615U (en) | 2016-08-19 | 2016-08-19 | Home appliance and be used for its fault arc detection device |
| EP16888595.2A EP3502719A4 (en) | 2016-08-19 | 2016-11-30 | Household appliance, and arc fault detection device and method therefor |
| PCT/CN2016/108097 WO2018032652A1 (en) | 2016-08-19 | 2016-11-30 | Household appliance, and arc fault detection device and method therefor |
| US15/907,082 US11444443B2 (en) | 2016-08-19 | 2018-02-27 | Household appliance and apparatus and method for detecting arc fault in the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620910253.7U CN206002615U (en) | 2016-08-19 | 2016-08-19 | Home appliance and be used for its fault arc detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206002615U true CN206002615U (en) | 2017-03-08 |
Family
ID=58196983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620910253.7U Active CN206002615U (en) | 2016-08-19 | 2016-08-19 | Home appliance and be used for its fault arc detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206002615U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018032652A1 (en) * | 2016-08-19 | 2018-02-22 | 广东美的制冷设备有限公司 | Household appliance, and arc fault detection device and method therefor |
-
2016
- 2016-08-19 CN CN201620910253.7U patent/CN206002615U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018032652A1 (en) * | 2016-08-19 | 2018-02-22 | 广东美的制冷设备有限公司 | Household appliance, and arc fault detection device and method therefor |
| US11444443B2 (en) | 2016-08-19 | 2022-09-13 | Gd Midea Air-Conditioning Equipment Co., Ltd. | Household appliance and apparatus and method for detecting arc fault in the same |
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