CN108072811A - A kind of batteries of electric automobile current supply circuit status of electrically connecting detection method and device - Google Patents
A kind of batteries of electric automobile current supply circuit status of electrically connecting detection method and device Download PDFInfo
- Publication number
- CN108072811A CN108072811A CN201711240591.XA CN201711240591A CN108072811A CN 108072811 A CN108072811 A CN 108072811A CN 201711240591 A CN201711240591 A CN 201711240591A CN 108072811 A CN108072811 A CN 108072811A
- Authority
- CN
- China
- Prior art keywords
- waveform
- current
- supply circuit
- batteries
- electric automobile
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a kind of batteries of electric automobile current supply circuit status of electrically connecting detection methods, it includes the use of the current waveform in current detecting unit acquisition batteries of electric automobile current supply circuit；The status of electrically connecting of batteries of electric automobile current supply circuit is judged using current waveform；The advantageous effect that the present invention obtains is：It can overcome and be difficult to provide fault location information existing for existing fault arc detection method, easily by least one of electromagnetic interference and these high shortcomings of false alarm rate.It is at low cost, accuracy is high, have practicability.
Description
Technical field
The present invention relates to electric vehicle engineering field, particularly a kind of batteries of electric automobile current supply circuit status of electrically connecting inspection
Survey method and device.
Background technology
The electric vehicle of road horsepower using battery is provided, the battery mould of multiple series connection is included in battery-powered circuit
Block, battery output connection terminal, feeder cable and load, between battery module, battery module and feed line pull between and
There is feed contact between feeder cable and load, these feed contacts by crimp, tighten and grafting etc. in a manner of realize and be electrically connected
It connects.The environmental factors such as vibration, oxidation and the dust sundries of vehicle can cause these to feed the loosening of contacts, corrosion, touch and break
The appearance of connecting faults such as split, these connecting faults occurred in battery-powered circuit can generate electric arc, spark phenomenon, and
The high temperature that electric arc, sparking can generate can further damage the electrical connection of feed junction, battery-powered circuit be caused to be paralysed, very
To causing self-burning of vehicle.
The increase of power battery capacity and the raising of voltage class used with electric vehicle, power battery current supply circuit
The upper possibility for generating fault electric arc and arc stiffness also improve therewith.Copper bar connecting pin present on power battery current supply circuit
Loosening or phenomena such as cable aging can cause the generation of fault electric arc.Fault electric arc is as a kind of high impedance fault, although production
Raw electric current is little, but energy is big, and temperature is high, the inflammable explosive article on the periphery that may ignite, and potential hazard is big.Due to connecing
The electric arc that contact at point generates extremely can further trigger or aggravate contact exception, and the contact of power battery current supply circuit is abnormal
Caused by extent of the destruction be exponentially increased at any time, therefore, in time find power battery current supply circuit contact exception simultaneously be subject to
It excludes, it is most important to the stability and service life of guarantee power battery current supply circuit.
The content of the invention
In view of the drawbacks described above of the prior art, it is an object of the invention to provide a kind of batteries of electric automobile current supply circuits
Status of electrically connecting detection method and device can overcome and be difficult to provide fault bit confidence existing for existing fault arc detection method
It ceases, easily by least one of electromagnetic interference and these high shortcomings of false alarm rate.It is at low cost, accuracy is high, have practicability.
An object of the present invention is that technical solution in this way is realized, a kind of batteries of electric automobile current supply circuit electricity
Connection status inspection method, it includes：
The current waveform in batteries of electric automobile current supply circuit is obtained using current detecting unit；
Including：Current Waveform Characteristics parameter in the batteries of electric automobile current supply circuit obtained using current detecting unit is touched
It sends out arc detection unit and carries out arc waveform information gathering；The batteries of electric automobile current supply circuit obtained using arc detection unit
The arc waveform characteristic parameter trigger current detection unit of generation carries out current waveform information gathering；
The status of electrically connecting of batteries of electric automobile current supply circuit is judged using current waveform；
Including：Current Waveform Characteristics parameter is obtained using current waveform；
Determine whether occur electrical connection exception in batteries of electric automobile current supply circuit using Current Waveform Characteristics parameter；
The Current Waveform Characteristics parameter includes waveform curvature, waveform peak-to-average force ratio, waveform peak amplitude, waveform spike number
At least one of in amount, waveform spike interval and waveform peak hour position.
Further, it is described to determine whether be electrically connected in batteries of electric automobile current supply circuit using Current Waveform Characteristics parameter
Exception is connect, including：
The Current Waveform Characteristics parameter corresponding to different current supply circuits included using batteries of electric automobile current supply circuit is true
Make the current supply circuit of existing electrical connection exception.
Further, it is described to determine whether be electrically connected in batteries of electric automobile current supply circuit using Current Waveform Characteristics parameter
Exception is connect, including：
At least one in Current Waveform Characteristics parameter is compared with the respective items in arc waveform characteristic parameter, when
When the matching error of the characteristic parameter item of comparison is less than predetermined matching error thresholding, batteries of electric automobile current supply circuit is judged
It is abnormal to there is electrical connection；
The arc waveform characteristic parameter includes waveform curvature, waveform peak-to-average force ratio, waveform peak amplitude, waveform spike number
At least one of in amount, waveform spike interval and waveform peak hour position.
Another object of the present invention is that technical solution in this way is realized, a kind of batteries of electric automobile current supply circuit
Status of electrically connecting detection device, it includes：
With current detection module and status of electrically connecting judgment module；
The current detection module, for current detecting unit to be used to obtain the electric current in batteries of electric automobile current supply circuit
Waveform, including fault current sensor；
The status of electrically connecting judgment module, for judging being electrically connected for batteries of electric automobile current supply circuit using current waveform
State is connect, including Current Waveform Characteristics parameter extraction submodule and status of electrically connecting judging submodule；
The current waveform direct information status of electrically connecting judgment module that the current detection module is obtained is electrically connected shape
State judgment module is electrically connected condition adjudgement using the current waveform information.
Further, the current detection module includes order connected fault current sensor and signal amplifier, signal
Amplifier is amplified the signal from fault current sensor, and the amplified signal is passed through current detection module
Output terminal send to the input terminal of status of electrically connecting judgment module, current detection module obtains battery using fault current sensor
Current waveform in current supply circuit.
Further, the status of electrically connecting judgment module includes the Current Waveform Characteristics parameter extraction electricity being linked in sequence
Road module and status of electrically connecting judge Subcircuits module, and Current Waveform Characteristics parameter extraction Subcircuits module includes voltage comparator
Or analog-digital converter, status of electrically connecting judge that Subcircuits module includes digital processing unit or analog operational circuit, the electrical connection shape
State judgment module sentences the status of electrically connecting in battery powered circuit using the current waveform that fault current sensor exports.
Further, the status of electrically connecting judgment module further includes the abnormal location determination circuit module that is electrically connected, this is abnormal electric
Even location determination circuit module judges that Subcircuits module is electrically connected with status of electrically connecting, for determining that batteries of electric automobile is powered back
Occurs the power supply sub-loop being electrically connected extremely in road.
Further, arc-detection module is further included；
The arc-detection module include the connected antenna of order, amplifying circuit, arc waveform characteristic parameter extraction circuit and
Identification circuit, the input of the module is electromagnetic radiation work(caused by the fault electric arc occurred in batteries of electric automobile current supply circuit
Rate, the output terminal of the module are electrically connected with status of electrically connecting judgment module.
By adopting the above-described technical solution, the present invention has the advantage that：Existing fault electric arc can be overcome to detect
Be difficult to provide existing for method fault location information, easily in by electromagnetic interference and these high shortcomings of false alarm rate at least one
Kind.It is at low cost, accuracy is high, have practicability.
Other advantages, target and the feature of the present invention will be illustrated in the following description to a certain extent, and
And to a certain extent, based on will be apparent to those skilled in the art to investigating hereafter, Huo Zheke
To be instructed from the practice of the present invention.The target and other advantages of the present invention can be wanted by following specification and right
Book is sought to realize and obtain.
Description of the drawings
The description of the drawings of the present invention is as follows：
Fig. 1 is the connection diagram of batteries of electric automobile current supply circuit status of electrically connecting detection method.
Fig. 2 is the connection diagram of batteries of electric automobile current supply circuit status of electrically connecting detecting system.
:Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples.
Embodiment：As shown in Figure 1, a kind of batteries of electric automobile current supply circuit status of electrically connecting detection method, it includes：
S110：The current waveform in batteries of electric automobile current supply circuit is obtained using current detecting unit；
S120：The status of electrically connecting of batteries of electric automobile current supply circuit is judged using current waveform.
In the present embodiment, the current detecting unit, the electric current detecting method used, which is included in current supply circuit, concatenates electricity
Resistance method, electromagnetic type Current Mutual Inductance method, electronic current mutual inductance method and magneto-optic effect method.
The electronic current mutual inductor that electronic current mutual inductance method uses includes Hall current sensor, Rogowski electricity
Flow sensor and the variable-frequency power sensor (can be used for voltage, electric current and power measurement) that is exclusively used in frequency conversion electrical measurement etc., suddenly
Your current sensor is used to tested electric current being converted to Hall voltage, then summation amplification.
Electronic current mutual inductor does not have a ferromagnetic saturation, transmission frequency bandwidth, secondary load capacity is small, size is small, it is light-weight,
It is the developing direction of current sensor from now on.
Fibre optic current sensor is the New type of current sensor based on Faraday magnetooptical effect, using optical fiber as medium.
Wherein, series resistor method includes superior MCU amplifier for monitoring and controlling electric current and examined for low-side current
It surveys.
The method that the present embodiment provides, wherein,
The current waveform obtained using current detecting unit in batteries of electric automobile current supply circuit, including：
Current Waveform Characteristics parameter in the batteries of electric automobile current supply circuit obtained using current detecting unit triggers electricity
Arc detection unit carries out arc waveform information gathering；Or
The arc waveform characteristic parameter that the batteries of electric automobile current supply circuit obtained using arc detection unit is generated triggers
Current detecting unit carries out current waveform information gathering.
Specifically, using the Current Waveform Characteristics parameter in the batteries of electric automobile current supply circuit of current detecting unit acquisition
It triggers arc detection unit and carries out arc waveform information gathering, including：
Judge the waveform curvature that Current Waveform Characteristics parameter includes, waveform peak-to-average force ratio, waveform peak amplitude, waveform spike number
Whether at least one of amount is more than predetermined decision threshold, when beyond predetermined decision threshold, then triggers arc-detection list
Member carries out arc waveform information gathering.
Specifically, judge whether current waveform curvature is more than predetermined decision threshold, including judging whether waveform curvature surpasses
Go out predetermined waveform curvature decision threshold, the first setting method of the waveform curvature decision threshold is, long using radius of curvature
As waveform curvature decision threshold, the first setting method of the waveform curvature decision threshold is angle value, long using radius of curvature
Angle value as waveform curvature decision threshold, second of setting method of the waveform curvature decision threshold is turned over using tangent line
The value C that the ratio between angle and corresponding arc length obtain is as waveform curvature decision threshold；
Specifically, judge whether current waveform peak amplitude is more than predetermined decision threshold, is included the use of in current waveform
Rush of current spike absolute amplitude value as predetermined decision threshold or using rush of current spike compared with electric current average
Amplitude difference as predetermined decision threshold；
Specifically, judge whether current waveform peak-to-average force ratio is more than predetermined decision threshold, is included the use of in current waveform
The maximum amplitude value of rush of current spike is with the ratio of electric current average as predetermined decision threshold；
Specifically, judge whether current waveform spike quantity is more than predetermined decision threshold, is included the use of in current waveform
Rush of current spike number as predetermined decision threshold, which is the natural number more than or equal to 1.
Specifically, the arc waveform that the batteries of electric automobile current supply circuit obtained using arc detection unit is generated is special
It levies parameter trigger current detection unit and carries out current waveform information gathering, including：
Judge wave-shape amplitude, waveform power that arc waveform characteristic parameter includes, waveform curvature, waveform peak-to-average force ratio, waveform
Whether at least one of peak amplitude, waveform spike quantity are more than predetermined decision threshold, when beyond predetermined decision threshold
When, then trigger current detection unit carries out current waveform information gathering.
Specifically, judge arc waveform amplitude whether be more than predetermined decision threshold, including using predetermined range value as
Amplitude is more than that the arc waveform amplitude of the thresholding is judged to the event of electric arc appearance, also, is more than the door in amplitude by decision threshold
After the arc waveform of limit occurs, trigger current detection unit carries out current waveform information gathering, wherein, the predetermined range value
Value range be more than 0.01 microvolt/rice or 0.01 micro- tesla value；Preferably, the value model of the predetermined range value
Be trapped among 0.01 microvolt/rice between 10 millivolts/meter or in 0.01 micro- tesla between 100 micro- teslas.
Specifically, judge arc waveform power whether be more than predetermined decision threshold, including using predetermined performance number as
Power is more than that the arc waveform amplitude of the thresholding is judged to the event of electric arc appearance, also, is more than the door in power by decision threshold
After the arc waveform of limit occurs, trigger current detection unit carries out current waveform information gathering, wherein, the predetermined performance number
Value range be more than 0.01 microwatt value；Preferably, the value range of the predetermined performance number is in 1 microwatt to 10 milliwatts
Between.
Specifically, judge whether arc waveform curvature is more than predetermined decision threshold, including judging that arc waveform curvature is
No to exceed predetermined waveform curvature decision threshold, the first setting method of the waveform curvature decision threshold is to use curvature half
Path length angle value is to use curvature half as waveform curvature decision threshold, the first setting method of the waveform curvature decision threshold
Path length angle value is to be turned using tangent line as waveform curvature decision threshold, second of setting method of the waveform curvature decision threshold
The value C that the ratio between the angle crossed and corresponding arc length obtain is as waveform curvature decision threshold；
Specifically, judge whether arc waveform peak amplitude is more than predetermined decision threshold, is included the use of in arc waveform
Electric arc impact spike absolute amplitude value as predetermined decision threshold or using electric arc impact spike compared with electric arc average
Amplitude difference as predetermined decision threshold；
Specifically, judge whether arc waveform peak-to-average force ratio is more than predetermined decision threshold, is included the use of in arc waveform
The maximum amplitude value of electric arc impact spike is with the ratio of electric arc average as predetermined decision threshold；
Specifically, judge whether arc waveform spike quantity is more than predetermined decision threshold, is included the use of in arc waveform
Electric arc impact spike number as predetermined decision threshold, which is the natural number more than or equal to 1.
The method that the present embodiment provides, wherein,
The status of electrically connecting that batteries of electric automobile current supply circuit is judged using current waveform, including：
Current Waveform Characteristics parameter is obtained using current waveform；
Determine whether occur electrical connection exception in batteries of electric automobile current supply circuit using Current Waveform Characteristics parameter；
The Current Waveform Characteristics parameter includes waveform curvature, waveform peak-to-average force ratio, waveform peak amplitude, waveform spike number
At least one of in amount, waveform spike interval and waveform peak hour position.
It is described to obtain Current Waveform Characteristics parameter using current waveform in the present embodiment, including following at least one step：
Current Waveform Characteristics parameter is obtained using the current waveform of analog representation；
The current waveform represented using digital quantity obtains Current Waveform Characteristics parameter.
Wherein, the current waveform using analog representation obtains Current Waveform Characteristics parameter, including as follows at least one
Kind step：
The current waveform of analog representation is inputted to the input terminal of two or more voltage comparators, is each
Voltage comparator sets different thresholdings；
The input terminal that the output of voltage comparator is sent to timer is used to read the current time of timer, changes the time and is
Amplitude is more than the time that the electric current of voltage comparator occurs；
Using the threshold value of voltage comparator as the range value of current waveform, using the current time of timer as current wave
The time of occurrence of the range value of shape；
Range value and its time of occurrence based on the current waveform, the waveform curvature of calculating current waveform, waveform peak are equal
Than, waveform peak amplitude, waveform spike quantity, in waveform spike interval and waveform peak hour position at least one of.
The current waveform represented using digital quantity obtains Current Waveform Characteristics parameter, including following at least one step
Suddenly：
Use the sample value and ratio method or differential method calculating current waveform curvature of the current waveform of digital quantity expression；
The sample value of the current waveform represented using digital quantity asks for the average and peak-peak of current waveform, using this
Value and peak-peak calculate waveform peak-to-average force ratio；
The sample value of the current waveform represented using digital quantity is by asking for the maximum of sample value or the sampling point of maximum
Position, using the sample value in the sampling point position of maximum or maximum as waveform peak amplitude；
The maximum or maximum of the current waveform represented using digital quantity ask for waveform spike quantity；
The current waveform maximum or the sampling point position of maximum represented using digital quantity determines waveform spike interval and ripple
Shape peak hour position.
In the present embodiment, determine whether occur in batteries of electric automobile current supply circuit as Current Waveform Characteristics parameter is used
A kind of abnormal specific implementation of electrical connection, including：
The current waveform range value occurred successively in time using 3 calculates 1 electric current curvature value, specifically includes：
Use the sample value of the current waveform collected respectively in current waveform samples moment ti (i >=1), ti+1 and ti+2
The current waveform curvature value Ki at ti+2 moment is calculated in Ii, Ii+1 and Ii+2；
When the current waveform curvature value Ki+1 obtained in current sample moment ti+3 calculates for current sample moment ti+2
To current waveform curvature value Ki N (N is positive integer) times when, then be judged to occur a batteries of electric automobile current supply circuit be electrically connected
Anomalous event is connect, no batteries of electric automobile current supply circuit electrical connection anomalous event is otherwise judged to and occurs.
The method that the present embodiment provides, wherein,
It is described to determine whether occur electrical connection exception in batteries of electric automobile current supply circuit using Current Waveform Characteristics parameter,
Including：
The Current Waveform Characteristics parameter corresponding to different current supply circuits included using batteries of electric automobile current supply circuit is true
Make the current supply circuit of existing electrical connection exception.
In the present embodiment, as the electric current corresponding to the different current supply circuits that batteries of electric automobile current supply circuit is used to include
Waveform feature parameter determines a kind of specific implementation for the abnormal current supply circuit of electrical connection occur, including：
The main feed conductance that the power battery pack leading-out terminal included in batteries of electric automobile current supply circuit is directly connected to
It flows and the first current detecting unit is set at item or major flow cable, supplied in the first son separated from main power feed flow guide bar or major flow cable
Second current detecting unit is set in electrical circuit；
The characteristic parameter of the current waveform obtained using the first current detecting unit judges main power feed flow guide bar or major flow
Whether electrical connection exception, and the current waveform that using second current detecting unit obtains are occurred on the corresponding main current supply circuit of cable
Characteristic parameter judge whether to occur being electrically connected from the first sub- current supply circuit that main power feed flow guide bar or major flow cable separate it is different
Often；
If it is abnormal to occur electrical connection on main current supply circuit, and appearance electrical connection is abnormal on the first sub- current supply circuit, then sentences
The abnormal position of power-off connection is on the first sub- current supply circuit；
If occurring electrical connection exception on main current supply circuit, and do not occur electrical connection exception on the first sub- current supply circuit, then sentence
The abnormal position of power-off connection is in the power supply sub-loop outside the first sub- current supply circuit；
If it is abnormal not occur electrical connection on main current supply circuit, judge do not occur electricity on batteries of electric automobile current supply circuit
Connection is abnormal；
If not occurring electrical connection exception on main current supply circuit, and occur electrical connection exception on the first sub- current supply circuit, then sentence
The electrical connection occurred on disconnected first sub- current supply circuit is extremely erroneous judgement.
The method that the present embodiment provides, wherein,
It is described to determine whether occur electrical connection exception in batteries of electric automobile current supply circuit using Current Waveform Characteristics parameter,
Including：
At least one in Current Waveform Characteristics parameter is compared with the respective items in arc waveform characteristic parameter, when
When the matching error of the characteristic parameter item of comparison is less than predetermined matching error thresholding, batteries of electric automobile current supply circuit is judged
It is abnormal to there is electrical connection；
The arc waveform characteristic parameter includes waveform curvature, waveform peak-to-average force ratio, waveform peak amplitude, waveform spike number
At least one of in amount, waveform spike interval and waveform peak hour position.
In the present embodiment, as by Current Waveform Characteristics parameter at least one of with arc waveform characteristic parameter in pair
Item is answered to be compared, when the matching error of the characteristic parameter item of comparison is less than predetermined matching error thresholding, by electric vehicle
Battery powered circuit is judged as a kind of abnormal specific implementation of electrical connection occur, including following at least one step：
Waveform curvature more than waveform curvature decision threshold in Current Waveform Characteristics parameter is gone out into current moment and arc waveform
Waveform curvature in characteristic parameter more than waveform curvature decision threshold goes out current moment and is compared, and the time of occurrence difference of the two is made
For matching error, when matching error is less than predetermined matching error thresholding, batteries of electric automobile current supply circuit is judged as
Now electrical connection is abnormal, wherein, the matching error thresholding is the time value less than 1 millisecond；
Waveform curvature more than waveform curvature decision threshold in Current Waveform Characteristics parameter is gone out into current moment and arc waveform
Waveform peak amplitude in characteristic parameter more than waveform peak amplitude decision threshold goes out current moment and is compared, by the appearance of the two
Time difference as matching error, when matching error is less than predetermined matching error thresholding, by batteries of electric automobile current supply circuit
It is judged as electrical connection exception occur, wherein, the matching error thresholding is the time value less than 1 millisecond；
Waveform spike more than waveform peak amplitude decision threshold in Current Waveform Characteristics parameter is gone out into current moment and electric arc
Waveform peak amplitude in waveform feature parameter more than waveform peak amplitude decision threshold goes out current moment and is compared, by the two
Time of occurrence difference, when matching error is less than predetermined matching error thresholding, batteries of electric automobile is powered as matching error
Circuit is judged as electrical connection exception occur, wherein, the matching error thresholding is the time value less than 1 millisecond；
To be more than the waveform spike occurrence number and electric arc of waveform peak amplitude decision threshold in Current Waveform Characteristics parameter
Waveform peak amplitude occurrence number in waveform feature parameter more than waveform peak amplitude decision threshold is compared, by the two
Appearance is taken second place than as matching error, when matching error is less than predetermined matching error thresholding, batteries of electric automobile is powered
Circuit is judged as electrical connection exception occur, wherein, the matching error thresholding is the reality of the value between closed interval [0.7,1.6]
Number.
Wherein, the first setting method of the waveform curvature decision threshold is, using radius of curvature length value as ripple
Shape curvature decision threshold, the first setting method of the waveform curvature decision threshold is, using radius of curvature length value as ripple
Shape curvature decision threshold, second of setting method of the waveform curvature decision threshold be, using the angle that tangent line turns over it is corresponding
The obtained value C of the ratio between arc length as waveform curvature decision threshold.
As shown in Fig. 2, a kind of batteries of electric automobile current supply circuit status of electrically connecting detection device, including：
Current detection module 210, status of electrically connecting judgment module 220；Wherein,
Current detection module 210, for current detecting unit to be used to obtain the electric current in batteries of electric automobile current supply circuit
Waveform, including fault current sensor；
Status of electrically connecting judgment module 220, for judging being electrically connected for batteries of electric automobile current supply circuit using current waveform
State is connect, including Current Waveform Characteristics parameter extraction submodule and status of electrically connecting judging submodule；
Wherein, the current waveform direct information status of electrically connecting judgment module that the current detection module 210 is obtained
220, status of electrically connecting judgment module 220 is electrically connected condition adjudgement using the current waveform information.
The current detection module that the present embodiment provides, the electric current detecting method used are included in series resistor in current supply circuit
At least one of method, electromagnetic type Current Mutual Inductance method, electronic current mutual inductance method and magneto-optic effect method electric current detecting method.
The electronic current mutual inductor that electronic current mutual inductance method uses includes Hall current sensor, Rogowski electricity
Flow sensor and the variable-frequency power sensor (can be used for voltage, electric current and power measurement) that is exclusively used in frequency conversion electrical measurement etc., suddenly
Your current sensor is used to tested electric current being converted to Hall voltage, then summation amplification.
Electronic current mutual inductor does not have a ferromagnetic saturation, transmission frequency bandwidth, secondary load capacity is small, size is small, it is light-weight,
It is the developing direction of current sensor from now on.
Fibre optic current sensor is the New type of current sensor based on Faraday magnetooptical effect, using optical fiber as medium.
Wherein, series resistor method includes superior MCU amplifier for monitoring and controlling electric current and examined for low-side current
It surveys.
The device that the present embodiment provides, wherein,
The current detection module 210, what is performed obtains batteries of electric automobile current supply circuit using current detecting unit
In current waveform operation, including following operating procedure：
Current Waveform Characteristics parameter in the batteries of electric automobile current supply circuit obtained using current detecting unit triggers electricity
Arc detection unit carries out arc waveform information gathering；Or
The arc waveform characteristic parameter that the batteries of electric automobile current supply circuit obtained using arc detection unit is generated triggers
Current detecting unit carries out current waveform information gathering.
Specifically, using the Current Waveform Characteristics parameter in the batteries of electric automobile current supply circuit of current detecting unit acquisition
It triggers arc detection unit and carries out arc waveform information gathering, including：
Judge the waveform curvature that Current Waveform Characteristics parameter includes, waveform peak-to-average force ratio, waveform peak amplitude, waveform spike number
Whether at least one of amount is more than predetermined decision threshold, when beyond predetermined decision threshold, then triggers arc-detection list
Member carries out arc waveform information gathering.
Specifically, judge whether current waveform curvature is more than predetermined decision threshold, including judging whether waveform curvature surpasses
Go out predetermined waveform curvature decision threshold, the first setting method of the waveform curvature decision threshold is, long using radius of curvature
As waveform curvature decision threshold, the first setting method of the waveform curvature decision threshold is angle value, long using radius of curvature
Angle value as waveform curvature decision threshold, second of setting method of the waveform curvature decision threshold is turned over using tangent line
The value C that the ratio between angle and corresponding arc length obtain is as waveform curvature decision threshold；
Specifically, judge whether current waveform peak amplitude is more than predetermined decision threshold, is included the use of in current waveform
Rush of current spike absolute amplitude value as predetermined decision threshold or using rush of current spike compared with electric current average
Amplitude difference as predetermined decision threshold；
Specifically, judge whether current waveform peak-to-average force ratio is more than predetermined decision threshold, is included the use of in current waveform
The maximum amplitude value of rush of current spike is with the ratio of electric current average as predetermined decision threshold；
Specifically, judge whether current waveform spike quantity is more than predetermined decision threshold, is included the use of in current waveform
Rush of current spike number as predetermined decision threshold, which is the natural number more than or equal to 1.
Specifically, the arc waveform that the batteries of electric automobile current supply circuit obtained using arc detection unit is generated is special
It levies parameter trigger current detection unit and carries out current waveform information gathering, including：
Judge wave-shape amplitude, waveform power that arc waveform characteristic parameter includes, waveform curvature, waveform peak-to-average force ratio, waveform
Whether at least one of peak amplitude, waveform spike quantity are more than predetermined decision threshold, when beyond predetermined decision threshold
When, then trigger current detection unit carries out current waveform information gathering.
Specifically, judge arc waveform amplitude whether be more than predetermined decision threshold, including using predetermined range value as
Amplitude is more than that the arc waveform amplitude of the thresholding is judged to the event of electric arc appearance, also, is more than the door in amplitude by decision threshold
After the arc waveform of limit occurs, trigger current detection unit carries out current waveform information gathering, wherein, the predetermined range value
Value range be more than 0.01 microvolt/rice or 0.01 micro- tesla value；Preferably, the value model of the predetermined range value
Be trapped among 0.01 microvolt/rice between 10 millivolts/meter or in 0.01 micro- tesla between 100 micro- teslas.
Specifically, judge arc waveform power whether be more than predetermined decision threshold, including using predetermined performance number as
Power is more than that the arc waveform amplitude of the thresholding is judged to the event of electric arc appearance, also, is more than the door in power by decision threshold
After the arc waveform of limit occurs, trigger current detection unit carries out current waveform information gathering, wherein, the predetermined performance number
Value range be more than 0.01 microwatt value；Preferably, the value range of the predetermined performance number is in 1 microwatt to 10 milliwatts
Between.
Specifically, judge whether arc waveform curvature is more than predetermined decision threshold, including judging that arc waveform curvature is
No to exceed predetermined waveform curvature decision threshold, the first setting method of the waveform curvature decision threshold is to use curvature half
Path length angle value is to use curvature half as waveform curvature decision threshold, the first setting method of the waveform curvature decision threshold
Path length angle value is to be turned using tangent line as waveform curvature decision threshold, second of setting method of the waveform curvature decision threshold
The value C that the ratio between the angle crossed and corresponding arc length obtain is as waveform curvature decision threshold；
Specifically, judge whether arc waveform peak amplitude is more than predetermined decision threshold, is included the use of in arc waveform
Electric arc impact spike absolute amplitude value as predetermined decision threshold or using electric arc impact spike compared with electric arc average
Amplitude difference as predetermined decision threshold；
Specifically, judge whether arc waveform peak-to-average force ratio is more than predetermined decision threshold, is included the use of in arc waveform
The maximum amplitude value of electric arc impact spike is with the ratio of electric arc average as predetermined decision threshold；
Specifically, judge whether arc waveform spike quantity is more than predetermined decision threshold, is included the use of in arc waveform
Electric arc impact spike number as predetermined decision threshold, which is the natural number more than or equal to 1.
The device that the present embodiment provides, wherein,
The status of electrically connecting judgment module 220, what is performed judges that batteries of electric automobile is powered back using current waveform
The operation of the status of electrically connecting on road, including following operating procedure：
Current Waveform Characteristics parameter is obtained using current waveform；
Determine whether occur electrical connection exception in batteries of electric automobile current supply circuit using Current Waveform Characteristics parameter；
The Current Waveform Characteristics parameter includes waveform curvature, waveform peak-to-average force ratio, waveform peak amplitude, waveform spike number
At least one of in amount, waveform spike interval and waveform peak hour position.
It is described to obtain Current Waveform Characteristics parameter using current waveform in the present embodiment, including following at least one step：
Current Waveform Characteristics parameter is obtained using the current waveform of analog representation；
The current waveform represented using digital quantity obtains Current Waveform Characteristics parameter.
Wherein, the current waveform using analog representation obtains Current Waveform Characteristics parameter, including as follows at least one
Kind step：
The current waveform of analog representation is inputted to the input terminal of two or more voltage comparators, is each
Voltage comparator sets different thresholdings；
The input terminal that the output of voltage comparator is sent to timer is used to read the current time of timer, changes the time and is
Amplitude is more than the time that the electric current of voltage comparator occurs；
Using the threshold value of voltage comparator as the range value of current waveform, using the current time of timer as current wave
The time of occurrence of the range value of shape；
Range value and its time of occurrence based on the current waveform, the waveform curvature of calculating current waveform, waveform peak are equal
Than, waveform peak amplitude, waveform spike quantity, in waveform spike interval and waveform peak hour position at least one of.
The current waveform represented using digital quantity obtains Current Waveform Characteristics parameter, including following at least one step
Suddenly：
Use the sample value and ratio method or differential method calculating current waveform curvature of the current waveform of digital quantity expression；
The sample value of the current waveform represented using digital quantity asks for the average and peak-peak of current waveform, using this
Value and peak-peak calculate waveform peak-to-average force ratio；
The sample value of the current waveform represented using digital quantity is by asking for the maximum of sample value or the sampling point of maximum
Position, using the sample value in the sampling point position of maximum or maximum as waveform peak amplitude；
The maximum or maximum of the current waveform represented using digital quantity ask for waveform spike quantity；
The current waveform maximum or the sampling point position of maximum represented using digital quantity determines waveform spike interval and ripple
Shape peak hour position.
In the present embodiment, determine whether occur in batteries of electric automobile current supply circuit as Current Waveform Characteristics parameter is used
A kind of abnormal specific implementation of electrical connection, including：
The current waveform range value occurred successively in time using 3 calculates 1 electric current curvature value, specifically includes：
Use the sample value of the current waveform collected respectively in current waveform samples moment ti (i >=1), ti+1 and ti+2
The current waveform curvature value Ki at ti+2 moment is calculated in Ii, Ii+1 and Ii+2；
When the current waveform curvature value Ki+1 obtained in current sample moment ti+3 calculates for current sample moment ti+2
To current waveform curvature value Ki N (N is positive integer) times when, then be judged to occur a batteries of electric automobile current supply circuit be electrically connected
Anomalous event is connect, no batteries of electric automobile current supply circuit electrical connection anomalous event is otherwise judged to and occurs.
The device that the present embodiment provides, wherein,
The status of electrically connecting judgment module 220, the use Current Waveform Characteristics parameter performed determine electric vehicle electricity
Whether electrical connection abnormal operation is occurred in the current supply circuit of pond, including following operating procedure：
The Current Waveform Characteristics parameter corresponding to different current supply circuits included using batteries of electric automobile current supply circuit is true
Make the current supply circuit of existing electrical connection exception.
In the present embodiment, as the electric current corresponding to the different current supply circuits that batteries of electric automobile current supply circuit is used to include
Waveform feature parameter determines a kind of specific implementation for the abnormal current supply circuit of electrical connection occur, including：
The main feed conductance that the power battery pack leading-out terminal included in batteries of electric automobile current supply circuit is directly connected to
It flows and the first current detecting unit is set at item or major flow cable, supplied in the first son separated from main power feed flow guide bar or major flow cable
Second current detecting unit is set in electrical circuit；
The characteristic parameter of the current waveform obtained using the first current detecting unit judges main power feed flow guide bar or major flow
Whether electrical connection exception, and the current waveform that using second current detecting unit obtains are occurred on the corresponding main current supply circuit of cable
Characteristic parameter judge whether to occur being electrically connected from the first sub- current supply circuit that main power feed flow guide bar or major flow cable separate it is different
Often；
If it is abnormal to occur electrical connection on main current supply circuit, and appearance electrical connection is abnormal on the first sub- current supply circuit, then sentences
The abnormal position of power-off connection is on the first sub- current supply circuit；
If occurring electrical connection exception on main current supply circuit, and do not occur electrical connection exception on the first sub- current supply circuit, then sentence
The abnormal position of power-off connection is in the power supply sub-loop outside the first sub- current supply circuit；
If it is abnormal not occur electrical connection on main current supply circuit, judge do not occur electricity on batteries of electric automobile current supply circuit
Connection is abnormal；
If not occurring electrical connection exception on main current supply circuit, and occur electrical connection exception on the first sub- current supply circuit, then sentence
The electrical connection occurred on disconnected first sub- current supply circuit is extremely erroneous judgement.
The device that the present embodiment provides, wherein,
The status of electrically connecting judgment module 220, the use Current Waveform Characteristics parameter performed determine electric vehicle electricity
Whether electrical connection abnormal operation is occurred in the current supply circuit of pond, including following operating procedure：
At least one in Current Waveform Characteristics parameter is compared with the respective items in arc waveform characteristic parameter, when
When the matching error of the characteristic parameter item of comparison is less than predetermined matching error thresholding, batteries of electric automobile current supply circuit is judged
It is abnormal to there is electrical connection；
The arc waveform characteristic parameter includes waveform curvature, waveform peak-to-average force ratio, waveform peak amplitude, waveform spike number
At least one of in amount, waveform spike interval and waveform peak hour position.
In the present embodiment, as by Current Waveform Characteristics parameter at least one of with arc waveform characteristic parameter in pair
Item is answered to be compared, when the matching error of the characteristic parameter item of comparison is less than predetermined matching error thresholding, by electric vehicle
Battery powered circuit is judged as a kind of abnormal specific implementation of electrical connection occur, including following at least one step：
Waveform curvature more than waveform curvature decision threshold in Current Waveform Characteristics parameter is gone out into current moment and arc waveform
Waveform curvature in characteristic parameter more than waveform curvature decision threshold goes out current moment and is compared, and the time of occurrence difference of the two is made
For matching error, when matching error is less than predetermined matching error thresholding, batteries of electric automobile current supply circuit is judged as
Now electrical connection is abnormal, wherein, the matching error thresholding is the time value less than 1 millisecond；
Waveform curvature more than waveform curvature decision threshold in Current Waveform Characteristics parameter is gone out into current moment and arc waveform
Waveform peak amplitude in characteristic parameter more than waveform peak amplitude decision threshold goes out current moment and is compared, by the appearance of the two
Time difference as matching error, when matching error is less than predetermined matching error thresholding, by batteries of electric automobile current supply circuit
It is judged as electrical connection exception occur, wherein, the matching error thresholding is the time value less than 1 millisecond；
Waveform spike more than waveform peak amplitude decision threshold in Current Waveform Characteristics parameter is gone out into current moment and electric arc
Waveform peak amplitude in waveform feature parameter more than waveform peak amplitude decision threshold goes out current moment and is compared, by the two
Time of occurrence difference, when matching error is less than predetermined matching error thresholding, batteries of electric automobile is powered as matching error
Circuit is judged as electrical connection exception occur, wherein, the matching error thresholding is the time value less than 1 millisecond；
To be more than the waveform spike occurrence number and electric arc of waveform peak amplitude decision threshold in Current Waveform Characteristics parameter
Waveform peak amplitude occurrence number in waveform feature parameter more than waveform peak amplitude decision threshold is compared, by the two
Appearance is taken second place than as matching error, when matching error is less than predetermined matching error thresholding, batteries of electric automobile is powered
Circuit is judged as electrical connection exception occur, wherein, the matching error thresholding is the reality of the value between closed interval [0.7,1.6]
Number.
Wherein, the first setting method of the waveform curvature decision threshold is, using radius of curvature length value as ripple
Shape curvature decision threshold, the first setting method of the waveform curvature decision threshold is, using radius of curvature length value as ripple
Shape curvature decision threshold, second of setting method of the waveform curvature decision threshold be, using the angle that tangent line turns over it is corresponding
The obtained value C of the ratio between arc length as waveform curvature decision threshold.
Finally illustrate, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, although with reference to compared with
The present invention is described in detail in good embodiment, it will be understood by those of ordinary skill in the art that, it can be to the skill of the present invention
Art scheme is modified or replaced equivalently, and without departing from the objective and scope of the technical program, should all be covered in the present invention
Right among.
Claims (8)
1. a kind of batteries of electric automobile current supply circuit status of electrically connecting detection method, which is characterized in that
The current waveform in batteries of electric automobile current supply circuit is obtained using current detecting unit；
Including：Current Waveform Characteristics parameter in the batteries of electric automobile current supply circuit obtained using current detecting unit triggers electricity
Arc detection unit carries out arc waveform information gathering；The batteries of electric automobile current supply circuit obtained using arc detection unit is generated
Arc waveform characteristic parameter trigger current detection unit carry out current waveform information gathering；
The status of electrically connecting of batteries of electric automobile current supply circuit is judged using current waveform；
Including：Current Waveform Characteristics parameter is obtained using current waveform；
Determine whether occur electrical connection exception in batteries of electric automobile current supply circuit using Current Waveform Characteristics parameter；
The Current Waveform Characteristics parameter includes waveform curvature, waveform peak-to-average force ratio, waveform peak amplitude, waveform spike quantity, ripple
At least one of in shape spike interval and waveform peak hour position.
2. batteries of electric automobile current supply circuit status of electrically connecting detection method as described in claim 1, which is characterized in that described
Determine whether occur electrical connection exception in batteries of electric automobile current supply circuit using Current Waveform Characteristics parameter, including：
The Current Waveform Characteristics parameter corresponding to different current supply circuits included using batteries of electric automobile current supply circuit is determined
Now it is electrically connected abnormal current supply circuit.
3. batteries of electric automobile current supply circuit status of electrically connecting detection method as described in claim 1, which is characterized in that described
Determine whether occur electrical connection exception in batteries of electric automobile current supply circuit using Current Waveform Characteristics parameter, including：
At least one in Current Waveform Characteristics parameter with the respective items in arc waveform characteristic parameter is compared, works as comparison
Characteristic parameter item matching error be less than predetermined matching error thresholding when, batteries of electric automobile current supply circuit is judged as
Now electrical connection is abnormal；
The arc waveform characteristic parameter includes waveform curvature, waveform peak-to-average force ratio, waveform peak amplitude, waveform spike quantity, ripple
At least one of in shape spike interval and waveform peak hour position.
4. the batteries of electric automobile current supply circuit status of electrically connecting detection device as described in claims 1 to 3 is any, feature exist
In with current detection module and status of electrically connecting judgment module；
The current detection module, for current detecting unit to be used to obtain the current wave in batteries of electric automobile current supply circuit
Shape, including fault current sensor；
The status of electrically connecting judgment module, for current waveform to be used to judge the electrical connection shape of batteries of electric automobile current supply circuit
State, including Current Waveform Characteristics parameter extraction submodule and status of electrically connecting judging submodule；
The current waveform direct information status of electrically connecting judgment module that the current detection module is obtained, status of electrically connecting are sentenced
Disconnected module is electrically connected condition adjudgement using the current waveform information.
5. batteries of electric automobile current supply circuit status of electrically connecting detection device as claimed in claim 4, which is characterized in that described
Current detection module, comprising order connected fault current sensor and signal amplifier, signal amplifier is to coming from failure electricity
The signal of flow sensor is amplified, and the amplified signal is sent by the output terminal of current detection module to electrical connection
The input terminal of condition judgment module, current detection module obtain the current wave in battery powered circuit using fault current sensor
Shape.
6. batteries of electric automobile current supply circuit status of electrically connecting detection device as claimed in claim 4, which is characterized in that described
Status of electrically connecting judgment module is sentenced comprising the Current Waveform Characteristics parameter extraction Subcircuits module being linked in sequence and status of electrically connecting
Disconnected Subcircuits module, Current Waveform Characteristics parameter extraction Subcircuits module include voltage comparator or analog-digital converter, electrical connection
Condition adjudgement Subcircuits module includes digital processing unit or analog operational circuit, which uses failure electricity
The current waveform of flow sensor output sentences the status of electrically connecting in battery powered circuit.
7. the batteries of electric automobile current supply circuit status of electrically connecting detection device as described in claim 4 to 6 is any, feature exist
In, the status of electrically connecting judgment module, the abnormal location determination circuit module that is electrically connected is further included, which is electrically connected location determination electricity
Road module judges that Subcircuits module is electrically connected with status of electrically connecting, abnormal for determining to occur in batteries of electric automobile current supply circuit
The power supply sub-loop being electrically connected.
8. the batteries of electric automobile current supply circuit status of electrically connecting detection device as described in claim 4 to 6 is any, feature exist
In further including arc-detection module；
The arc-detection module includes connected antenna, amplifying circuit, arc waveform characteristic parameter extraction circuit and the identification of order
Circuit, the input of the module is electromagnetic radiance caused by the fault electric arc occurred in batteries of electric automobile current supply circuit,
The output terminal of the module is electrically connected with status of electrically connecting judgment module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711240591.XA CN108072811A (en) | 2017-11-30 | 2017-11-30 | A kind of batteries of electric automobile current supply circuit status of electrically connecting detection method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711240591.XA CN108072811A (en) | 2017-11-30 | 2017-11-30 | A kind of batteries of electric automobile current supply circuit status of electrically connecting detection method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108072811A true CN108072811A (en) | 2018-05-25 |
Family
ID=62157635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711240591.XA Pending CN108072811A (en) | 2017-11-30 | 2017-11-30 | A kind of batteries of electric automobile current supply circuit status of electrically connecting detection method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108072811A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109781279A (en) * | 2019-02-28 | 2019-05-21 | 中车青岛四方机车车辆股份有限公司 | Train axle box temperature monitoring method and device |
| CN112363070A (en) * | 2021-01-14 | 2021-02-12 | 江苏固德威电源科技股份有限公司 | Battery arc discharge detection method and device and battery energy storage system |
| CN113820616A (en) * | 2020-06-02 | 2021-12-21 | 广州汽车集团股份有限公司 | Battery monitoring method and system, battery management system and vehicle |
| WO2023277936A1 (en) * | 2021-06-30 | 2023-01-05 | Gm Cruise Holdings Llc | Degraded sensor assembly detection |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107356841A (en) * | 2017-08-19 | 2017-11-17 | 浙江安美科技有限公司 | A kind of batteries of electric automobile current supply circuit status of electrically connecting detection method and device |
-
2017
- 2017-11-30 CN CN201711240591.XA patent/CN108072811A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107356841A (en) * | 2017-08-19 | 2017-11-17 | 浙江安美科技有限公司 | A kind of batteries of electric automobile current supply circuit status of electrically connecting detection method and device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109781279A (en) * | 2019-02-28 | 2019-05-21 | 中车青岛四方机车车辆股份有限公司 | Train axle box temperature monitoring method and device |
| CN113820616A (en) * | 2020-06-02 | 2021-12-21 | 广州汽车集团股份有限公司 | Battery monitoring method and system, battery management system and vehicle |
| CN112363070A (en) * | 2021-01-14 | 2021-02-12 | 江苏固德威电源科技股份有限公司 | Battery arc discharge detection method and device and battery energy storage system |
| CN112363070B (en) * | 2021-01-14 | 2021-06-22 | 江苏固德威电源科技股份有限公司 | Battery arc discharge detection method and device and battery energy storage system |
| WO2023277936A1 (en) * | 2021-06-30 | 2023-01-05 | Gm Cruise Holdings Llc | Degraded sensor assembly detection |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108072811A (en) | A kind of batteries of electric automobile current supply circuit status of electrically connecting detection method and device | |
| CN105785129B (en) | A kind of insulation testing device for electric automobile | |
| CN201886117U (en) | Insulation detection circuit of electrically-propelled vehicle | |
| CN105823922B (en) | Hum bar electrical induction device | |
| CN105842540A (en) | Method for detecting DC bus insulation resistance | |
| CN105339769A (en) | System and method for detection of wire breakage | |
| CN104569772A (en) | Electric high-voltage direct current insulation detecting circuit and method | |
| CN112858838A (en) | Cable fault positioning system and method | |
| CN105259416A (en) | An insulation resistance detector applied to an IT system and a detection method thereof | |
| CN107356841A (en) | A kind of batteries of electric automobile current supply circuit status of electrically connecting detection method and device | |
| CN207148267U (en) | A kind of batteries of electric automobile current supply circuit status of electrically connecting detection means | |
| CN205880042U (en) | Hum bar electric induction circuit | |
| CN203894310U (en) | Coal mine explosion-proof power supply detection electricity verification and feed device | |
| CN206594214U (en) | Transient electric field and electromagnetic field attack detecting circuit and its electric energy meter being made | |
| CN209764938U (en) | Anti-interference lightning current waveform recording device | |
| CN205643517U (en) | Electric automobile high voltage insulation fault locating device | |
| CN111122976A (en) | Insulation resistance detection method for electric vehicle | |
| CN219490168U (en) | Potential acquisition and measurement circuit of cathodic protection acquisition instrument | |
| CN102759657B (en) | System and method for detecting coupling current | |
| CN203643508U (en) | Low resistance detection device of equipotential device free of dismounting | |
| CN212658803U (en) | Diagnostic circuit with current detection function | |
| CN212932793U (en) | On-line detection equipment for insulation resistance of power utilization system | |
| CN216748022U (en) | Isolation detection circuit for isolating power supply | |
| CN110346684A (en) | The winding coil method of inspection, device, cooking apparatus and readable storage medium storing program for executing | |
| CN220039552U (en) | Uncapping processing circuit supporting MCU downtime working condition and gas meter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180525 |