CN107505544A - Based on microprocessor without externally fed electric arc alarm - Google Patents
Based on microprocessor without externally fed electric arc alarm Download PDFInfo
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- CN107505544A CN107505544A CN201710692729.3A CN201710692729A CN107505544A CN 107505544 A CN107505544 A CN 107505544A CN 201710692729 A CN201710692729 A CN 201710692729A CN 107505544 A CN107505544 A CN 107505544A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/14—Circuits therefor, e.g. for generating test voltages, sensing circuits
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- General Physics & Mathematics (AREA)
- Emergency Alarm Devices (AREA)
Abstract
The present invention propose it is a kind of based on microprocessor without externally fed electric arc alarm, including：Idle arc detection unit, microprocessor, alarm, power supply unit, wherein, idle arc detection unit includes at least one set of measure loop and at least one switch element, switching means conductive corresponding to being driven when every group of measure loop, during output pulse signal, then judge to detect arc signal, the pulse signal of output is sent to microprocessor；Microprocessor is used for return pulse signal, and pulse number is counted, to judge whether to detect arc fault；Alarm receives the alarm command for carrying out microprocessor, and sends electric arc alarm signal according to alarm command, to prompt user.The present invention just can monitor the arc fault of ac power supply circuit without externally fed and wiring, and send alarm signal.
Description
Technical field
The present invention relates to Electric arc monitoring technical field, it is more particularly to a kind of based on microprocessor without externally fed electric arc report
Alert device.
Background technology
In the Fire in China analysis of causes, fire accounting is more than 30% caused by electric reason.
The reason for electrical fire occurs a lot, short circuit, insulation ag(e)ing, excessively stream, earth fault, loose contact, household electrical appliances or electricity
Hot equipment igniting flammable items etc..In essence, in all electrical fire generating processes, can all there is electric arc.
In the U.S., according to CPSC (US Consumer Product Safety Commission) statistics of 1998, every year because distribution line is old
Change causes fire caused by electric arc to have more than 40000, causes 16.8 hundred million dollars of direct economic loss.
Arc-fault circuit interrupter is currently existed, with the addition of to play fault electric arc on the basis of traditional breaker and protect
The function of shield effect, to take precautions against the fire triggered due to fault electric arc.But existing arc-fault circuit interrupter should at some
With easy malfunction under scene, and directly trip, normal production and life, current electric arc fault protection one may be influenceed
As be all mounted in local single load, such as air-conditioning.
In addition, the installation of existing arc-fault circuit interrupter needs to have a power failure, belong to the facility installed in advance, substantial amounts of occasion
There is presently no such facility.The generation of electric arc causes fire not always necessarily, if because socket
Loosen the power supply tripping in whole family or room just, expand the scope of power failure, have a strong impact on production and life.It is actual big
In majority application, it is thus only necessary to alert, user can be reminded.
Current existing on the market arc-fault circuit interrupter or alarm device, all it is to need wiring, it is necessary to the installation that has a power failure,
It is conditional to installation personnel.Also, existing arc-fault circuit interrupter or alarm device are required for powering.
The content of the invention
The purpose of the present invention is intended at least solve one of described technological deficiency.
Therefore, it is an object of the invention to provide it is a kind of based on microprocessor without externally fed electric arc alarm.
To achieve these goals, embodiments of the invention provide it is a kind of based on microprocessor without externally fed electric arc report
Alert device, including：
Idle arc detection unit, microprocessor, alarm, power supply unit, wherein, the microprocessor and the nothing
Power consumption arc detection unit connects with alarm, said supply unit and the idle arc detection unit, microprocessor, report
Alert device connection；
The idle arc detection unit includes at least one set of measure loop and at least one switch element, electric when occurring
During arc failure, because the electric current under arc fault has larger high fdrequency component, the voltage of every group of measure loop sensing can drive
Switching means conductive corresponding to dynamic, during output pulse signal, then judge to detect arc signal, the pulse signal of output is sent
To the microprocessor；
The microprocessor is used to receive the pulse signal, and pulse number is counted, to judge whether to detect
To arc fault, including：In preset duration, if pulse number between first threshold and Second Threshold, judges inspection
Arc fault is measured, alarm command is sent to the alarm；If pulse number is less than the first threshold, judgement does not have
Arc fault；If pulse number is more than the Second Threshold, it is judged as continuous interference signal, and non-arc fault；
The alarm receives the alarm command for carrying out the microprocessor, and sends electric arc alarm according to the alarm command
Signal, to prompt user；
The energy is collected and current detecting unit is used to collect energy from the current transformer, by the energy of collection to
Said supply unit, alarm, idle arc detection unit and microprocessor power supply, and the electric current of detection user load
Value.
Further, the alarm includes alarm unit and wireless signal transmission unit,
The wireless signal transmission unit receives the alarm command from the microprocessor, and carries out alert process；
The alarm unit sends electric arc alarm signal, the electric arc alarm signal is using extremely according to the alarm command
A kind of few following form：Sound, light, vibration, non-modulation radio signal, the radio signal of modulation.
Further, the wireless signal transmitter uses the wireless communication mode of one of following form：Zigbee、LoRa、
LoRaWAN、NBIOT。
Further, at least one set of measure loop includes at least one detection coil, and each detection coil uses
There is no the air core coil of magnetic core or have the coil of magnetic core.
Further, the switch element uses the metal-oxide-semiconductor or triode or ultra-low power consumption integrated circuit of Low threshold.
Further, in addition to：Ambient parameter detection unit, the ambient parameter detection unit is collected with the energy and electricity
Stream detection unit connects with the microprocessor, for detecting the temperature and humidity data in environment, is detecting situations below
For the moment, judge distribution box failure, notify the alarm to send alarm signal：
Environment temperature exceedes setting value, ambient humidity exceedes setting value, user load electric current exceedes setting value and continues pre-
If duration.
Further, the microprocessor is additionally operable to when energy is collected and current detecting unit detects that load current exceedes and set
When definite value and duration, control starts alarm and sends alarm signal, while by the wireless signal transmission list of the alarm
Member sends wireless alarm signal to central control room；
There is situations below for the moment when ambient parameter detection unit detects, control starts alarm and sends alarm signal
Number, while wireless alarm signal is sent to central control room by the wireless signal transmission unit of the alarm：Environment temperature surpasses
Setting value is crossed, and the duration exceedes setting value；Ambient humidity exceedes setting value, and the duration exceedes setting value.
Further, the wireless signal transmitter in the alarm be additionally operable to regularly to send its detection load current and
Its local environment temperature humidity information.
Further, the alarm uses the form of buckle installation with monitoring circuit, fastener is opened, by the alarm
It is enclosed on monitoring circuit, then closes fastener, causes current transformer and detection coil to be enclosed on measure loop.
Further, the fastener is buckle either screw or jump ring.
Further, the energy collection and current detecting unit and current transformer, power supply unit, the idle electric arc
Detection unit, microprocessor connect with alarm,
The energy is collected and current detecting unit is used to collect energy from the current transformer, by the energy of collection to
Said supply unit, alarm, idle arc detection unit and microprocessor power supply, and the electric current of detection user load
Value.
It is according to embodiments of the present invention based on microprocessor without externally fed electric arc alarm, examined using idle electric arc
At least one set of measure loop surveyed in unit detects whether arc fault occur, and will be from Current Mutual Inductance using energy acquisition circuit
The energy of device collection is provided to rechargeable battery or super capacitor, to realize without externally fed with wiring with regard to that can monitor to exchange confession
The arc fault of electrical circuit, and send sound or other warning information.The present invention can be widely applied to arc fault alarm,
Distribution box temperature alarm, the temperature alarm and cable duct temperature alarming of cable connector etc. occasion.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become in the description from combination accompanying drawings below to embodiment
Substantially and it is readily appreciated that, wherein：
Fig. 1 is the structure chart without externally fed electric arc alarm based on microprocessor according to the embodiment of the present invention；
Fig. 2 a and Fig. 2 b are the scheme of installation according to the alarm of the embodiment of the present invention；
Fig. 3 is the circuit diagram of the idle arc detection unit of the embodiment of the present invention；
Fig. 4 is energy collection and the circuit diagram of current detecting unit of the embodiment of the present invention；
Fig. 5 is the circuit diagram of the temperature humidity monitoring unit of the embodiment of the present invention；
Fig. 6 is the structure chart without externally fed electric arc alarm based on microprocessor of the embodiment of the present invention.
Embodiment
Embodiments of the invention are described below in detail, the example of embodiment is shown in the drawings, wherein identical from beginning to end
Or similar label represents same or similar element or the element with same or like function.Retouched below with reference to accompanying drawing
The embodiment stated is exemplary, it is intended to for explaining the present invention, and is not considered as limiting the invention.
As shown in figure 1, the embodiment of the present invention based on microprocessor without externally fed electric arc alarm, including：It is idle
Consume arc detection unit 1 (including detection coil), microprocessor 2, alarm 42, power supply unit 6.It should be noted that Fig. 1 is
Schematic diagram after detection coil summation current transformer iron core closure.
Specifically, microprocessor 2 is connected with idle arc detection unit 1 and alarm 42.
Idle arc detection unit 1 includes at least one set of measure loop and at least one switch element, when generation electric arc
During failure, because the electric current under arc fault has larger high fdrequency component, the voltage of every group of measure loop sensing can drive
Corresponding switching means conductive, during output pulse signal, then judge to detect arc signal, by the pulse signal of output send to
Microprocessor 2.In one embodiment of the invention, switch element uses the metal-oxide-semiconductor or triode or ultralow work(of Low threshold
Consume integrated circuit.
In one embodiment of the invention, at least one set of measure loop includes at least one detection coil or at least one
The external capacitive of individual detection coil and equivalent amount is formed, and specifically includes following three kinds of situations：
(1) 1 detection coil
+ 1 electric capacity of (2) 1 detection coils
1 coil in above-mentioned (1), (2), the combination of+1 electric capacity of 1 coil, as long as can driving switch unit just recognize
It is possible for arc fault, counted relatively by software to differentiate.
The quantity electric capacity such as (3) two and above detection coil+equivalent amount electric capacity or two and above detection coil+non-
The quantity electric capacity such as two and above detection coil+equivalent amount electric capacity or two and above detection coil+non-
Combination, it can only drive all switch elements just to think that arc fault is possible, be counted relatively by software to differentiate.
Specifically, in order to more preferably distinguish normal power network interference signal and fault electric arc signal, detected using at least one set
Loop includes at least two detection coils and the external capacitive of equivalent amount is formed, and each detection coil could be used without the sky of magnetic core
Wire-core coil or the coil for having magnetic core, the magnetic permeability mu of magnetic core<2000.
With reference to three kinds of forms of above-mentioned measure loop, arc-detection principle is illustrated：
First, the output voltage of the set detection coil of measure loop on the subscriber line be proportional to its detection current value and
Frequency values.Because electric power signal is generally low frequency sine wave signal, the magnitude of voltage that can be exported on measure loop is very low, deficiency
Turned on driving switch unit.But fault electric arc signal contains larger high-frequency signal, and the voltage output of detection coil with
The frequency of signal is proportional, can export larger magnitude of voltage on a high frequent signal, can be with driving switch unit.In this hair
In bright one embodiment, obtained through experiment, the voltage that can be exported on a high frequent signal can exceed 1V.
If measure loop is single coil, the conducting of the output voltage energy driving switch unit of detection coil is thought to have can
There can be arc fault.If measure loop is the measure loop that single coil or single coil and electric capacity are formed, only examine
Survey time road output voltage can driving switch unit conducting i.e. think to be possible to arc fault；According to two and with
Upper measure loop, only multiple measure loop output voltages can driving switch unit conducting i.e. think to be possible to arc fault
Occur.
When not having arc signal, very close 0 microwatt of its stand-by power consumption, standby current is triode or Low threshold
The leakage current of metal-oxide-semiconductor.According to 2 and above measure loop, one group of the electric capacity composition of each detection coil and external connection
It is not integral multiple relation between the resonance dot frequency of measure loop, at least one loop is using following manner to arc signal
Detected：Every group of measure loop can drive corresponding to switching means conductive, during output pulse signal, then judgement detects electricity
Arc signal, only when each measure loop exports by pulse, just it is judged as arc signal.
As shown in figure 3, subscribers' line to be detected is passed through into each detection coil, line fault arc signal is in detection line
Induced voltage on circle, metal-oxide-semiconductor either triode or the ultra-low power consumption integrated circuit of Low threshold are directly or indirectly driven, is used
In the power supply of startup microprocessor 2, while it is also used for the monitoring of arc signal.
Specifically, detection coil 1 and external capacitor 1 form one group of measure loop, for driving the Low threshold MOS being connected
Pipe or triode or ultra-low power consumption integrated circuit cut-off.Detection coil 2 and external capacitor 2 form another group of measure loop,
For driving cut-offfing for the Low threshold metal-oxide-semiconductor that is connected or triode.
Below to the operation principle of non-power consumption arc detection unit 1：
When subscribers' line has electric arc generation, caused high-frequency impulse.Wherein, high-frequency signal is to be compared to power frequency
For 50HZ, 60HZ or intermediate frequency 400HZ, 800HZ, it is at least its more than 10 times frequency.
Induced voltage in each detection coil Low threshold metal-oxide-semiconductor or makes three corresponding to can directly or indirectly triggering
Pole pipe circuit turn-on, so as to start a monostable circuit, start to power to microprocessor 2, while be also fed into the arteries and veins of microprocessor 2
Punching detection counting circuit, carries out step-by-step counting.By taking two measure loops as an example, two detection coils form resonance with two electric capacity
Frequency can select the arc signal of different frequency not into integral multiple, and only two measure loops can trigger Low threshold metal-oxide-semiconductor
Or transistor circuit conducting is set just to be considered the arc signal that needs detect.Other situations filter out, and do not detect and alert, this
Sample can also reduce system power dissipation.
Microprocessor 2 is in off-position usually, after arc detection circuitry triggers, the work of the circuit of microprocessor 2, and operation
The program that inside weaves, the pulse number of arc detection circuitry is counted.Specifically, microprocessor 2 receives pulse letter
Number, and pulse number is counted, to judge whether to detect arc fault, including：In preset duration, if pulse
Numerical digit then judges to detect arc fault, sends alarm command to alarm 42, simultaneously between first threshold and Second Threshold
Wireless signal transmitter in alarm 42 sends wireless alarm signal to central control room.Microprocessor 2 is ever since by giving
The umber of pulse of fixed time detecting arc discharge, until detecting no arc fault, then stop audible ringing signal and nothing
Line alarm signal is launched, and disconnects own power source.Alarm 42 is in obstructed electricity condition usually, in the control of the pin of microprocessor 2
Under system, alarm signal is provided, arc discharge in call user's attention circuit be present, user manually goes inquiry electric arc where to be present to put
Electric point.For example, alarm 42 can be voice guard 42, alarm is sent in the form of buzzing etc..
Preferably, preset duration can be 200 milliseconds.
If pulse number is less than first threshold, no arc fault is judged, for normal arcs such as switch combined floodgates；If
Pulse number is more than Second Threshold, then is judged as continuous interference signal, the continuous electricity of non-arc fault, such as brush direct current motor
The normal arc of arc load.For example, first threshold is 5, Second Threshold 1000.
Alarm 42 receives the alarm command for carrying out microprocessor 2, and sends electric arc alarm signal according to alarm command, to carry
Show user.In one embodiment of the invention, alarm 42 includes alarm unit and wireless signal transmission unit 41,
Wireless signal transmission unit 41 receives the alarm command from microprocessor 2, and carries out alert process.Wherein, nothing
Line signal projector uses the wireless communication mode of one of following form：Other nothings such as Zigbee, LoRa, LoRaWAN, NBIOT
Line communication modes.
Wireless signal transmitter uses ZIGBEE, and LORA, LORAWAN or other wireless communication modes are, it is necessary to configure
One center, radio alarming information is received, carry out alert process.It is primarily adapted for use in nobody live occasion of alarm.
Alarm unit sends one or more electric arc alarm signals, electric arc alarm signal is using at least according to alarm command
A kind of following form：Sound, light, vibration, non-modulation radio signal, the radio signal of modulation.
In one embodiment of the invention, when alarm unit uses voice guard 42, it includes：Peripheral drive circuit
Formed with piezoelectric ceramic alarm 42 and corresponding resonant cavity, the input and output pin of microprocessor 2, provide high level and then report
Alert device 42 is powered, the sounding of alarm 42.Low level alarm 42 powers off, the not sounding of alarm 42, not power consumption.
As shown in fig. 6, energy is collected and current detecting unit 3 and current transformer 7, power supply unit 6, the non-power consumption
Arc detection unit 1 (including detection coil 8), microprocessor 2 and alarm 42 connect.Energy is collected and current detecting unit 3 is used
In collecting energy from current transformer, by the energy of collection to power supply unit 6, alarm 42, the and of idle arc detection unit 1
Microprocessor 2 is powered, and the current value of detection user load.
Specifically, as shown in figure 4, energy is collected and current detecting unit 3 collects skill from the energy of current transformer power taking
Art, by user load current-induced secondary transformer energy, for can power supply unit 6 charge so that whole alarm
42 do not need externally fed can normal work；The monitoring function of power supply unit 6 is provided, the voltage of power supply unit 6 is low or failure bar
Under part, audible ringing signal is sent, prompts user to change or repair.
Power supply unit 6 and idle arc detection unit 1, microprocessor 2, alarm 42, energy collection and current detecting
Unit 3, ambient parameter detection unit 5 etc. connect, to be powered to above-mentioned device.
In one embodiment of the invention, power supply unit 6 can be non-rechargeable battery, rechargeable battery, super capacitor.
When not having user load, energy collects circuit when not working, and by power supply unit 6 can also be alarm 42 and micro-
Processor 2 is powered, and ensures its normal work.
Energy collection/current detecting unit 3, energy is collected from the output of current transformer, is powered to power supply unit 6.And
And detection subscribers' line operating current.
With reference to figure 4, the output of current transformer collects circuit after rectifier bridge rectifying and wave-filtering to energy, is collected by energy
Circuit is powered to power supply unit 6.CT mutual inductor ratio will obtain very greatly, such as 2000：1, such transformer can export ratio
Higher voltage, enables to rectifier bridge to turn on.Under 0.5A loading condition, 1v about 0.25mA can be about exported, about
0.25mw power, it is contemplated that stand-by power consumption is less than 10uW level, it is sufficient to charged to power supply unit 6, many energy are searched at present
The integrated circuit of collection can meet the requirement.Under conditions of load current is bigger, the power of output can be bigger.It can ensure
The work steady in a long-term of alarm 42.The circuit is also responsible for the detection of electric current, and electricity is detected by the AD input measurements of microprocessor 2
The voltage at R2 both ends is hindered, the current value of user load is calculated by software.
Further, as shown in figure 5, the embodiment of the present invention based on microprocessor 2 without externally fed electric arc alarm 42
Also include：Ambient parameter detection unit 5, ambient parameter detection unit 5 is collected with energy and current detecting unit 3 and microprocessor
2 connections, for detecting the temperature and humidity data in environment, situations below a period of time is being detected, distribution box failure is being judged, leads to
Know that alarm 42 sends alarm signal：Environment temperature exceedes setting value, ambient humidity exceedes setting value, user load electric current exceedes
Setting value and lasting preset duration.
That is, setting value is exceeded in the environment temperature of monitoring, ambient humidity exceedes setting value or load current exceedes setting
Value and lasting regular hour, it is believed that monitor distribution box failure, and send sound or other warning information.
In the case of no electric arc pulse, microprocessor 2 at set intervals, sends the electric current of current supply circuit
Its local environment temperature humidity value residing for value and alarm 42.
In one embodiment of the invention, ambient parameter detection unit 5 can be integrated using humidity temperature pickup
The intelligence sensor of change, is directly accessed the I2C interface of microprocessor 2, and software directly reads temperature value and humidity by I2C interface
Value, the temperature value and humidity value of environment are obtained by computing.
In addition, microprocessor 2 is additionally operable to when energy is collected and current detecting unit 3 detects that load current exceedes setting value
And during duration, control starts alarm 42 and sends alarm signal, while by the wireless signal transmission unit 41 of alarm 42
Wireless alarm signal is sent to central control room.
The timing wake-up of microprocessor 2, load current, environment temperature and ambient humidity are monitored, when load current exceedes setting
Value and duration exceed setting value, start voice guard 42, alarm, while wireless signal transmitter and send radio alarming letter
Number give central control room；When environment temperature exceedes setting value, and the duration exceedes setting value, starts voice guard 42, report
It is alert, while wireless signal transmitter sends wireless alarm signal to central control room；When ambient humidity exceedes setting value, and continue
Time exceedes setting value, starts voice guard 42, alarm, while wireless signal transmitter and sends wireless alarm signal to center
Control room.
Accordingly, the wireless base station apparatus in alarm 42, the announcement of arc fault can be sent when arc fault occurs
Alert information, it also can regularly send the load current and environment temperature and humidity information of its detection.
In one embodiment of the invention, alarm 42 uses the form of buckle installation with monitoring circuit, and installation is simple,
Mounting means without wiring.As shown in Figure 2 a, fastener is opened, alarm 42 is enclosed on the loop of monitoring, then closed
Fastener, to cause current transformer and detection coil to be enclosed on measure loop.It can work as shown in Figure 2 b.
Preferably, fastener is buckle either screw or jump ring.
It is according to embodiments of the present invention based on microprocessor without externally fed electric arc alarm, examined using idle electric arc
At least one set of measure loop surveyed in unit detects whether arc fault occur, and will be from Current Mutual Inductance using energy acquisition circuit
The energy of device collection is provided to rechargeable battery or super capacitor, to realize without externally fed with wiring with regard to that can monitor to exchange confession
The arc fault of electrical circuit, and send sound or other warning information.The present invention can be widely applied to arc fault alarm,
Distribution box temperature alarm, the temperature alarm and cable duct temperature alarming of cable connector etc. occasion.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the present invention.In this manual, to the schematic representation of above-mentioned term not
Necessarily refer to identical embodiment or example.Moreover, specific features, structure, material or the feature of description can be any
One or more embodiments or example in combine in an appropriate manner.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art is not departing from the principle and objective of the present invention
In the case of above-described embodiment can be changed within the scope of the invention, change, replace and modification.The scope of the present invention
By appended claims and its equivalent limit.
Claims (10)
1. it is a kind of based on microprocessor without externally fed electric arc alarm, it is characterised in that including：Idle arc-detection list
Member, microprocessor, alarm, power supply unit, wherein, the microprocessor and the idle arc detection unit and alarm
Device is connected, and said supply unit is connected with the idle arc detection unit, microprocessor, alarm；
The idle arc detection unit includes at least one set of measure loop and at least one switch element, when generation electric arc event
During barrier, because the electric current under arc fault has a high fdrequency component, the voltage of every group of measure loop sensing can drive corresponding to open
Unit conducting is closed, during output pulse signal, then judges to detect arc signal, the pulse signal of output is sent to micro- place
Manage device；
The microprocessor is used to receive the pulse signal, and pulse number is counted, to judge whether to detect electricity
Arc failure, including：In preset duration, if pulse number, between first threshold and Second Threshold, judgement detects
Arc fault, alarm command is sent to the alarm；If pulse number is less than the first threshold, no electric arc is judged
Failure；If pulse number is more than the Second Threshold, it is judged as continuous interference signal, non-arc fault；
The alarm receives the alarm command for carrying out the microprocessor, and sends electric arc alarm signal according to the alarm command
Number, to prompt user.
2. as claimed in claim 1 based on microprocessor without externally fed electric arc alarm, it is characterised in that the alarm
Device includes alarm unit and wireless signal transmission unit,
The wireless signal transmission unit receives the alarm command from the microprocessor, and carries out alert process；
The alarm unit sends electric arc alarm signal according to the alarm command, the electric arc alarm signal use at least with
A kind of lower form：Sound, light, vibration, non-modulation radio signal, the radio signal of modulation.
3. as claimed in claim 2 based on microprocessor without externally fed electric arc alarm, it is characterised in that described wireless
Signal projector uses the wireless communication mode of one of following form：Zigbee、LoRa、LoRaWAN、NBIOT.
4. as claimed in claim 1 based on microprocessor without externally fed electric arc alarm, it is characterised in that it is described at least
One group of measure loop includes at least one detection coil, and each detection coil could be used without the air core coil of magnetic core or have
The coil of magnetic core.
5. as claimed in claim 1 based on microprocessor without externally fed electric arc alarm, it is characterised in that the switch
Unit uses the metal-oxide-semiconductor or triode or ultra-low power consumption integrated circuit of Low threshold.
6. as claimed in claim 1 based on microprocessor without externally fed electric arc alarm, it is characterised in that also include：
Ambient parameter detection unit, the ambient parameter detection unit is collected with the energy and current detecting unit and the microprocessor
Device connects, and for detecting the temperature and humidity data in environment, is detecting situations below a period of time, is judging distribution box failure,
The alarm is notified to send alarm signal：
When environment temperature exceedes setting value, ambient humidity exceedes setting value more than setting value, user load electric current and persistently preset
It is long.
7. as claimed in claim 6 based on microprocessor without externally fed electric arc alarm, it is characterised in that micro- place
Reason device is additionally operable to when energy is collected and current detecting unit detects that load current exceedes setting value and duration, and control is opened
Dynamic alarm sends alarm signal, while sends wireless alarm signal to center by the wireless signal transmission unit of the alarm
Control room；
There is situations below for the moment when ambient parameter detection unit detects, control starts alarm and sends alarm signal, together
When by the alarm wireless signal transmission unit send wireless alarm signal to central control room：Environment temperature exceedes setting
It is worth, and the duration exceedes setting value；Ambient humidity exceedes setting value, and the duration exceedes setting value.
8. as claimed in claim 7 based on microprocessor without externally fed electric arc alarm, it is characterised in that the alarm
Wireless signal transmitter in device is additionally operable to regularly to send the load current and its local environment temperature humidity information of its detection.
9. as claimed in claim 1 based on microprocessor without externally fed electric arc alarm, it is characterised in that the alarm
Device uses the form of buckle installation with monitoring circuit, opens fastener, the alarm is enclosed on monitoring circuit, then closed
Fastener, to cause current transformer and detection coil to be enclosed on measure loop, wherein, the fastener is buckle or spiral shell
Silk or jump ring.
10. as claimed in claim 9 based on microprocessor without externally fed electric arc alarm, it is characterised in that the energy
Amount is collected and current detecting unit and current transformer, power supply unit, idle arc detection unit, microprocessor and the report
Alert device connection,
The energy is collected and current detecting unit is used to collect energy from the current transformer, by the energy of collection to described
Power supply unit, alarm, idle arc detection unit and microprocessor power supply, and the current value of detection user load.
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| CN201710692729.3A CN107505544B (en) | 2017-08-14 | 2017-08-14 | Microprocessor-based arc alarm without external power supply |
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| CN201710692729.3A CN107505544B (en) | 2017-08-14 | 2017-08-14 | Microprocessor-based arc alarm without external power supply |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109166262A (en) * | 2018-09-20 | 2019-01-08 | 上海枫昱能源科技有限公司 | Electric wiring fire alarm Internet of Things perception terminal and system based on Current Mutual Inductance |
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