CN209460391U - A kind of intelligent electric energy meter safety detection circuit and intelligent electric energy meter - Google Patents
A kind of intelligent electric energy meter safety detection circuit and intelligent electric energy meter Download PDFInfo
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- CN209460391U CN209460391U CN201821926642.4U CN201821926642U CN209460391U CN 209460391 U CN209460391 U CN 209460391U CN 201821926642 U CN201821926642 U CN 201821926642U CN 209460391 U CN209460391 U CN 209460391U
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Abstract
A kind of intelligent electric energy meter safety detection circuit, comprising: sample conversion module, safety detection module, main control module and uplink communication module, sample conversion module detects firewire electric current, voltage between neutral line current and zero curve and firewire generates firewire current digital signal, voltage digital signal between neutral line current digital signal and zero curve-firewire, and calculate the first electrical parameter, safety detection module is according to firewire current digital signal, voltage digital signal, which calculates, between neutral line current digital signal and zero curve-firewire generates the second electrical parameter, and warning information is obtained according to the second electrical parameter and the load characteristic library prestored；Main control module stores and shows the first electrical parameter and warning information；Uplink communication module forwards warning information to judge that route whether there is the Electrical Safety hidden danger such as electric leakage, excess load and illegal load, and sends warning information, can effectively exclude load Electrical Safety hidden danger.
Description
Technical field
The utility model belong to electric energy meter detection technique field more particularly to a kind of intelligent electric energy meter safety detection circuit and
Intelligent electric energy meter.
Background technique
Currently, the intelligence of intelligent electric energy meter is mainly reflected in meter reading and payment aspect, but it is not used to user load
Electricity consumption situation carry out safety detection；Detection of electrical leakage switch is generallyd use in terms of safety detection and short-circuit detecting switch is leaked
The electric Electrical Safety that user load is protected with short-circuit detecting, when the leakage current of user load reaches given threshold or line electricity
When stream is more than given threshold, then power-off protection is executed；However, lacking in given threshold leakage current below and illegal load current
Warning function cannot really exclude the Electrical Safety hidden danger of user load.
Therefore, intelligent electric energy meter present in traditional technical solution exist cannot to leakage current and illegal load current into
Row early warning and cannot exclude load Electrical Safety hidden danger the problem of.
Utility model content
The utility model provides a kind of intelligent electric energy meter safety detection circuit and intelligent electric energy meter, it is intended to solve traditional skill
Intelligent electric energy meter present in art scheme exists and cannot cannot exclude load to leakage current and the progress early warning of illegal load current
The problem of Electrical Safety hidden danger.
The utility model is realized in this way a kind of intelligent electric energy meter safety detection circuit, comprising:
It is connect with zero curve and firewire, for passing through the electricity between detection firewire electric current, neutral line current and zero curve and firewire
Voltage digital signal between pressure generation firewire current digital signal, neutral line current digital signal and zero curve-firewire, and calculate first
The sample conversion module of electrical parameter；
It is connect with the sample conversion module, for according to the firewire current digital signal, neutral line current number
Voltage digital signal, which calculates, between signal and the zero curve-firewire generates the second electrical parameter, and according to second electrical parameter and
The load characteristic library prestored obtains the safety detection module of warning information；
It is connect with the sample conversion module and the safety detection module, for storing and showing first electrical parameter
And the main control module of the warning information；And
It is connected between the main control module and main station system, for forwarding the uplink communication module of the warning information.
The safety detection module is specifically used in one of the embodiments: according to firewire current effective value and zero curve
Current effective value obtains leakage pre-alarm information；Present load class is obtained according to second mass parameter and the load characteristic library
The working condition of type and present load is obtained according to the user type information in the present load type and the load characteristic library
Negated method loads warning information；It is calculated according to the working condition of the present load and generates general power, and according to the general power
Excess load warning information is obtained with threshold power；According to the neutral line current virtual value, the firewire current effective value and pre-
If short circuit current obtains short-circuit warning information.
The sample conversion module includes: to connect with firewire in one of the embodiments, for detecting firewire electric current simultaneously
Generate the firewire current sampling circuit of firewire current sampled analogue signal；It is connect with zero curve, for detecting neutral line current and generating
The neutral line current sample circuit of neutral line current sampled analogue signals；Connect with zero curve and firewire, for detect zero curve and firewire it
Between voltage and generate the voltage sampling circuit of voltage analog signal between zero curve-firewire；And respectively with the firewire current sample
Circuit, the neutral line current sample circuit and voltage sampling circuit connection, for according to the firewire current sample mould
Voltage analog signal generates the firewire electricity between quasi- signal, the neutral line current sampled analogue signals and the zero curve-firewire
Voltage digital signal between streaming digital signal, the neutral line current digital signal and the zero curve-firewire, and calculate generation electric current
Virtual value, voltage effective value, power and electric energy electric energy computation chip.
The safety detection module includes: to connect with the sample conversion module in one of the embodiments, for reading
Take voltage digital signal between the firewire current digital signal, the neutral line current digital signal and the zero curve-firewire
SPI communication interface circuit；It is connect with the SPI communication interface circuit, for according to the firewire current digital signal, described zero
Voltage digital signal, which calculates, between line current digital signal and the zero curve-firewire generates quality of voltage parameter value, firewire electric current
Virtual value, neutral line current virtual value and power, and according to the quality of voltage parameter value, the firewire current effective value, institute
It states neutral line current virtual value and the power and the load characteristic library prestored obtains the safety detection chip of warning information；And even
It is connected between the safety detection chip and the main control module, for generating first voltage to the peace according to power supply
The voltage conversion circuit of full detection chip power supply.
The firewire current sampling circuit includes: manganese copper diverter, first resistor, second in one of the embodiments,
Resistance, 3rd resistor, first capacitor and the second capacitor；The manganese copper diverter is concatenated with the firewire, and the copper-manganese shunts
The first end of the first end of device, the first end of the first resistor and the second resistance connects altogether, the manganese copper diverter
The first end of second end, the second end of the first resistor and the 3rd resistor connects altogether, the second end of the second resistance
The first output end as the firewire current sampling circuit is connect altogether with the first end of the first capacitor, the 3rd resistor
The first end of second end and second capacitor connects the second output terminal as the firewire current sampling circuit altogether, and described first
The first end of capacitor and the second end of second capacitor are connected to ground altogether.
The neutral line current sample circuit includes: zero line mutual inductor, the 4th resistance, the 5th in one of the embodiments,
Resistance, the 6th resistance, third capacitor and the 4th capacitor；The zero line mutual inductor is concatenated with the zero curve, the zero curve mutual inductance
The first end of the first end of device, the first end of the 4th resistance and the 5th resistance connects altogether, the zero line mutual inductor
The first end of second end, the second end of the 4th resistance and the 6th resistance connects altogether, the second end of the 5th resistance
The first output end as the neutral line current sample circuit is connect altogether with the first end of the third capacitor, the 6th resistance
Second end and the first end of the 4th capacitor connect the second output terminal as the neutral line current sample circuit, the third altogether
The first end of capacitor and the second end of the 4th capacitor are connected to ground altogether.
The voltage sampling circuit includes: the 7th resistance, the 8th resistance, the 9th resistance, in one of the embodiments,
Five capacitors and the 6th capacitor；The first end of 7th resistance is connect with the zero curve, the first end of the 9th resistance with
Firewire connection, the first of the second end of the 7th resistance, the first end of the 8th resistance and the 5th capacitor
End connects the first output end as the voltage sampling circuit altogether, and the of the second end of the 9th resistance and the 6th capacitor
One end connects the second output terminal as the voltage sampling circuit altogether, the second end of the 8th resistance, the 5th capacitor
Second end and the second end of the 6th capacitor are connected to ground altogether.
In addition, a kind of intelligent electric energy meter is also provided, including above-mentioned intelligent electric energy meter safety detection circuit.
Above-mentioned intelligent electric energy meter safety detection circuit, by safety detection module according to the second electrical parameter and load characteristic
Library obtains warning information, and main control module stores and show the first electrical parameter and warning information, and is turned by uplink communication module
Warning information is sent out, to obtain route with the presence or absence of electric leakage and the information of excess load, and warning information is sent, can effectively arrange
Except load Electrical Safety hidden danger.
Detailed description of the invention
Fig. 1 is the module diagram for the intelligent electric energy meter safety detection circuit that an embodiment of the present invention provides；
Fig. 2 is the module diagram for the intelligent electric energy meter safety detection circuit that another embodiment of the utility model provides；
Fig. 3 is the circuit diagram for the intelligent electric energy meter safety detection circuit that another embodiment of the utility model provides；
Fig. 4 is the module diagram for the intelligent electric energy meter safety detection circuit that another embodiment of the utility model provides；
Fig. 5 is the circuit diagram for the intelligent electric energy meter safety detection circuit that another embodiment of the utility model provides.
Specific embodiment
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
Fig. 1 shows the module signal of the intelligent electric energy meter safety detection circuit of the utility model preferred embodiment offer
Figure, for ease of description, only the parts related to this embodiment are shown, and details are as follows:
With reference to Fig. 1, intelligent electric energy meter safety detection circuit includes: sample conversion module 10, safety detection module 20, master control
Module 30 and uplink communication module 40.
Wherein, sample conversion module 10 is connect with zero curve and firewire, for by detection firewire electric current, neutral line current and
Voltage between zero curve and firewire generates firewire current digital signal, neutral line current digital signal and zero curve-fire voltage between lines
Digital signal, and calculate the first electrical parameter；Safety detection module 20 is connect with sample conversion module 10, for according to firewire electric current
Voltage digital signal, which calculates, between digital signal, neutral line current digital signal and zero curve-firewire generates the second electrical parameter, and according to
Second electrical parameter and the load characteristic library prestored obtain warning information；Main control module 30 and sample conversion module 10 and safety
Detection module 20 connects, for storing and showing the first electrical parameter and warning information；Uplink communication module 40 is connected to master control mould
Between block 30 and main station system, for forwarding warning information.It is effective that first electrical parameter specifically includes current effective value, voltage
Value, power and electric energy；Second electrical parameter, which specifically includes quality of voltage parameter value, firewire current effective value, neutral line current, to be had
Valid value, power and harmonic component.In the particular embodiment, main control module 30 includes single-chip microcontroller, clock circuit, storage electricity
Road, display circuit and communicating circuit, for reading the items such as voltage, electric current, power and electric energy from sample conversion module 10
Continuous data reads warning information from safety detection module 20, and the data of reading is stored, shown and passed through uplink
Communication module 40 uploads main station system, to control the normal operation of intelligent electric energy meter various functions.40 turns of uplink communication module
Current effective value, voltage effective value, power, electric energy and warning information are sent out, so that main station system can timing copy reading voltage, electricity
The operation warning information data of the every continuous data and intelligent electric energy meter such as stream, power and electric energy；Uplink communication module 40 with
It can wirelessly be communicated by PLC power line carrier, micropower between main station system.
In the present embodiment, early warning letter is obtained according to the second electrical parameter and load characteristic library by safety detection module 20
Breath, main control module 30 stores and shows the first electrical parameter and warning information, and forwards early warning letter by uplink communication module 40
Breath to obtain route with the presence or absence of electric leakage and the information of excess load, and sends warning information, can effectively exclude load and use
Electric security risk.
Safety detection module 20 is specifically used in one of the embodiments: according to firewire current effective value and zero curve electricity
It flows virtual value and obtains leakage pre-alarm information；Present load type is obtained according to the second mass parameter and load characteristic library and is currently born
The working condition of load；Illegal load early warning letter is obtained according to the user type information in present load type and load characteristic library
Breath, user type information includes resident or industrial user；It is calculated according to the working condition of present load and generates general power, and
Excess load warning information is obtained according to general power and threshold power；According to neutral line current virtual value, firewire current effective value and
Default short circuit current obtains short-circuit warning information.In a particular embodiment, when safety detection module 20 judges that neutral line current is effective
When value and firewire current effective value are unequal, then there is electric leakage in route, and wherein leakage current is firewire current effective value and zero curve electricity
The difference of virtual value is flowed, the threshold range of leakage current can be arranged according to practical application request；Such as: when leakage current is 10mA-
When 30mA, safety detection module 20 obtains leakage pre-alarm information；When leakage current is greater than 30mA, then valve power-off is drawn automatically, simultaneously
Safety detection module 20 exports power cut-off information.Load characteristic library refers to the load of the various working conditions of known common electric
Characteristic set can be constantly updated.Safety detection module 20 transfers load characteristic library and quality of voltage parameter value, power pair
Than type, energy consumption, working condition and the start-stop time of present load can be obtained, and by according to all current on route
The working condition of load estimates general power, and when general power is greater than threshold power, acquisition excess load warning information can also be analyzed super
The reason of load, such as: load on route is excessive, electric appliance is abnormal.When neutral line current virtual value or firewire electric current have
When valid value reaches default short circuit current within a preset time, then automatic emergency draws valve processing, while safety detection module 20 exports
Short-circuit warning information；Safety detection module 20 passes through user type letter corresponding in comparison present load type and load characteristic library
Breath, if industrial user appears in resident's load, industrial user is illegal load, such as: electric welding machine appears in resident
On user load, then electric welding machine is illegal load, so that safety detection module 20 be made to obtain illegal load warning information.
Sample conversion module 10 includes: that firewire current sampling circuit 101, neutral line current are adopted in one of the embodiments,
Sample circuit 102, voltage sampling circuit 103, electric energy computation chip 104.
Wherein, firewire current sampling circuit 101 is connect with firewire, for detecting firewire electric current and generating firewire current sample
Analog signal；Neutral line current sample circuit 102 is connect with zero curve, for detecting neutral line current and generating neutral line current sampling simulation
Signal；Voltage sampling circuit 103 is connect with zero curve and firewire, for detecting the voltage between zero curve and firewire and generating zero curve-
Voltage analog signal between firewire；Electric energy computation chip 104 respectively with firewire current sampling circuit 101, neutral line current sample circuit
102 and voltage sampling circuit 103 connect, for according to firewire current sampled analogue signal, neutral line current sampled analogue signals
And voltage analog signal generates firewire current digital signal, neutral line current digital signal and zero curve-firewire between zero curve-firewire
Between voltage digital signal, and calculate and generate current effective value, voltage effective value, power and electric energy.In the particular embodiment,
Sample conversion module 10 further includes the first communication interface 105 and the second communication interface 106, and the first communication interface 105 is connected to master
It controls between module 30 and electric energy computation chip 104, is used for repeat current virtual value, voltage effective value, power and electric energy；Second
Communication interface 106 is connected between safety detection module 20 and electric energy computation chip 104, for forwarding firewire current digital to believe
Number, voltage digital signal between neutral line current digital signal and zero curve-firewire.
Safety detection module 20 includes: SPI communication interface circuit 201, safety detection chip in one of the embodiments,
202 and voltage conversion circuit 203.
Wherein, SPI (Serial Peripheral Interface, Serial Peripheral Interface (SPI)) communication interface circuit 201 and
The connection of three communication interfaces 204, it is electric between firewire current digital signal, neutral line current digital signal and zero curve-firewire for forwarding
Press digital signal；Safety detection chip 202 is connect with SPI communication interface circuit 201, for according to firewire current digital signal,
Between neutral line current digital signal and zero curve-firewire voltage digital signal calculate quality of voltage parameter value, firewire current effective value,
Neutral line current virtual value and power, and warning information is obtained with the comparison of load characteristic library according to result is generated；Voltage conversion electricity
Road 203 is connected between safety detection chip 202 and main control module 30, for generating first voltage to peace according to power supply
Full detection chip 202 is powered.In the particular embodiment, safety detection module 20 further includes third communication interface 204 and the 4th
Communication interface 205, third communication interface 204 is connect with the second communication interface 106, for forwarding firewire current digital signal, zero
Voltage digital signal between line current digital signal and zero curve-firewire；4th communication interface 205 is connected to safety detection chip
Between 202 and main control module 30, for forwarding warning information.Safety detection module 20 in the present embodiment can find scene
Specific abnormal conditions reported, to carrying out automatically winding up processing there may be the emergency of safety accident, realize pair
The actual time safety electro-detection of power grid tip, automatically winding up processing can effectively avoid the generation of accident, and the control that will have a power failure exists
In smaller range, unnecessary large-area power-cuts is avoided, while reporting warning information that service personnel can be helped quickly to navigate to event
The reason of hindering point and breaking down.
Firewire current sampling circuit 101 includes: manganese copper diverter, first resistor R1, second in one of the embodiments,
Resistance R2,3rd resistor R3, first capacitor C1 and the second capacitor C2；Manganese copper diverter is concatenated with firewire, manganese copper diverter
The first end of first end, the first end of first resistor R1 and second resistance R2 connects altogether, the second end of manganese copper diverter, the first electricity
The first end of the second end and 3rd resistor R3 that hinder R1 connects altogether, the second end of second resistance R2 and the first end of first capacitor C1
The first output end as firewire current sampling circuit 101, the second end of 3rd resistor R3 and the first of the second capacitor C2 are connect altogether
End connects second output terminal as firewire current sampling circuit 101 altogether, and the of the first end of first capacitor C1 and the second capacitor C2
Two ends are connected to ground altogether.
Neutral line current sample circuit 102 includes: zero line mutual inductor, the 4th resistance R4, the 5th in one of the embodiments,
Resistance R5, the 6th resistance R6, third capacitor C3 and the 4th capacitor C4；Zero line mutual inductor is concatenated with zero curve, zero line mutual inductor
The first end of first end, the first end of the 4th resistance R4 and the 5th resistance R5 connects altogether, the second end of zero line mutual inductor, the 4th electricity
The first end of the second end and the 6th resistance R6 that hinder R4 connects altogether, the second end of the 5th resistance R5 and the first end of third capacitor C3
The first output end as neutral line current sample circuit 102, the second end of the 6th resistance R6 and the first of the 4th capacitor C4 are connect altogether
End connects second output terminal as neutral line current sample circuit 102 altogether, and the of the first end of third capacitor C3 and the 4th capacitor C4
Two ends are connected to ground altogether.
Voltage sampling circuit 103 includes: the 7th resistance R7, the 8th resistance R8, the 9th resistance in one of the embodiments,
R9, the 5th capacitor C5 and the 6th capacitor C6；The first end of 7th resistance R7 is connect with zero curve, the first end of the 9th resistance R9 with
Firewire connection, second end, the first end of the 8th resistance R8 and the first end of the 5th capacitor C5 of the 7th resistance R7 connect conduct altogether
First output end of voltage sampling circuit 103, the second end of the 9th resistance R9 and the first end of the 6th capacitor C6 are connect altogether as electricity
Press the second output terminal of sample circuit 103, second end, the second end and the 6th capacitor C6 of the 5th capacitor C5 of the 8th resistance R8
Second end be connected to ground altogether.
Below to the work of the intelligent electric energy meter safety detection circuit of the utility model by taking circuit diagram shown in fig. 5 as an example
It is illustrated as principle, details are as follows:
Firewire electric current is detected using manganese copper diverter and firewire current sample mould is generated by firewire current sampling circuit 101
Quasi- signal；Current transformer detects neutral line current and generates neutral line current sampling simulation letter by neutral line current sample circuit 102
Number；Voltage sampling circuit 103 detects the voltage between zero curve and firewire and generates voltage analog signal between zero curve-firewire；Electric energy
Metering chip 104 is by voltage analog between firewire current sampled analogue signal, neutral line current sampled analogue signals and zero curve-firewire
Signal is converted to voltage digital signal between firewire current digital signal, neutral line current digital signal and zero curve-firewire, and calculates
Generate current effective value, voltage effective value, power and electric energy.
Keep safety detection chip 202 real by the second communication interface 106, third communication interface 204 and SPI communication interface
When read voltage digital signal between firewire current digital signal, neutral line current digital signal and zero curve-firewire, and according to firewire
Voltage digital signal, which calculates, between current digital signal, neutral line current digital signal and zero curve-firewire generates quality of voltage parameter
Value, firewire current effective value, neutral line current virtual value and power.Safety detection chip 202 according to firewire current effective value and
Neutral line current virtual value and the generation leakage pre-alarm information in firewire current effective value and unequal neutral line current virtual value；Root
Present load type and working condition are obtained according to quality of voltage parameter value, power and preset load characteristic library, further according to current
The working condition of load calculates general power, and excess load warning information is generated when general power is greater than threshold power；Default
Neutral line current virtual value or firewire current effective value in time generate short-circuit warning information when being greater than default short circuit current.
To make main control module 30 by the 4th communication interface 205 receive leakage pre-alarm information, excess load warning information with
And short-circuit warning information, the number of current effective value, voltage effective value, power and electric energy is received by the first communication interface 105
According to, and received data are stored and shown, and then uplink communication module 40 is made to forward electric warning information, excess load early warning
Information, short-circuit warning information, current effective value, voltage effective value, power and electric energy data to main station system, in order to work
Make the operation items early warning of the every continuous data and intelligent electric energy meter such as personnel's timing copy reading voltage, electric current, power and electric energy
Information data, while staff can be helped quickly to navigate to fault point and the reason of break down.
The utility model has the beneficial effects that
(1) voltage between firewire electric current, neutral line current and zero curve and firewire that will test by sample conversion module
Voltage digital signal between generation firewire current digital signal, neutral line current digital signal and zero curve-firewire, and calculate the first electricity
Parameter makes safety detection module according to firewire current digital signal, neutral line current digital signal and the zero curve-fire read in real time
Voltage between lines digital signal, which calculates, generates the second electrical parameter, and obtains early warning according to the second electrical parameter and preset load characteristic library
Information so that main control module stores and show the first electrical parameter and warning information, and is believed by the early warning of uplink communication module forwards
Breath.
(2) by calculating neutral line current, firewire electric current and zero curve detected-fire voltage between lines, route can be obtained
It situations such as with the presence or absence of electric leakage, excess load, short circuit and illegal load, to send corresponding warning information, can effectively exclude
Load Electrical Safety hidden danger.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (8)
1. a kind of intelligent electric energy meter safety detection circuit, which is characterized in that the intelligent electric energy meter safety detection circuit includes:
It is connect with zero curve and firewire, for raw by the voltage between detection firewire electric current, neutral line current and zero curve and firewire
At voltage digital signal between firewire current digital signal, neutral line current digital signal and zero curve-firewire, and calculate the first electricity ginseng
Several sample conversion modules；
It is connect with the sample conversion module, for according to the firewire current digital signal, the neutral line current digital signal
And voltage digital signal calculates the second electrical parameter of generation between the zero curve-firewire, and according to second electrical parameter and prestores
Load characteristic library obtain warning information safety detection module；
It is connect with the sample conversion module and the safety detection module, for storing and showing first electrical parameter and institute
State the main control module of warning information；And
It is connected between the main control module and main station system, for forwarding the uplink communication module of the warning information.
2. intelligent electric energy meter safety detection circuit as described in claim 1, which is characterized in that the safety detection module is specific
For:
Leakage pre-alarm information is obtained according to firewire current effective value and neutral line current virtual value；According to second electrical parameter and institute
The working condition that load characteristic library obtains present load type and present load is stated, according to the present load type and described negative
User type information in lotus feature database obtains illegal load warning information；It is calculated and is given birth to according to the working condition of the present load
Excess load warning information is obtained at general power, and according to the general power and threshold power；According to the neutral line current virtual value,
The firewire current effective value and default short circuit current obtain short-circuit warning information.
3. intelligent electric energy meter safety detection circuit as described in claim 1, which is characterized in that the sample conversion module packet
It includes:
It is connect with firewire, for detecting firewire electric current and generating the firewire current sampling circuit of firewire current sampled analogue signal；
It is connect with zero curve, for detecting neutral line current and generating the neutral line current sample circuits of neutral line current sampled analogue signals；
It connect with zero curve and firewire, believes for voltage analog between detecting the voltage between zero curve and firewire and generating zero curve-firewire
Number voltage sampling circuit；And
It is connect respectively with the firewire current sampling circuit, the neutral line current sample circuit and the voltage sampling circuit,
For according between the firewire current sampled analogue signal, the neutral line current sampled analogue signals and the zero curve-firewire
Voltage analog signal generates between the firewire current digital signal, the neutral line current digital signal and the zero curve-firewire
Voltage digital signal, and calculate the electric energy computation chip for generating current effective value, voltage effective value, power and electric energy.
4. intelligent electric energy meter safety detection circuit as described in claim 1, which is characterized in that the safety detection module packet
It includes:
It is connect with the sample conversion module, for reading the firewire current digital signal, the neutral line current digital signal
And between the zero curve-firewire voltage digital signal SPI communication interface circuit；
It is connect with the SPI communication interface circuit, for being believed according to the firewire current digital signal, the neutral line current number
Number and the zero curve-firewire between voltage digital signal calculate generate quality of voltage parameter value, firewire current effective value, zero curve electricity
Virtual value and power are flowed, and effective according to the quality of voltage parameter value, the firewire current effective value, the neutral line current
Value and the power and the load characteristic library prestored obtain the safety detection chip of warning information；And
It is connected between the safety detection chip and the main control module, for generating first voltage according to power supply to give
The voltage conversion circuit of the safety detection chip power supply.
5. intelligent electric energy meter safety detection circuit as claimed in claim 3, which is characterized in that the firewire current sampling circuit
It include: manganese copper diverter, first resistor, second resistance, 3rd resistor, first capacitor and the second capacitor；
The manganese copper diverter is concatenated with the firewire, the first end of the first end of the manganese copper diverter, the first resistor
And the first end of the second resistance connects altogether, the second end of the manganese copper diverter, the second end of the first resistor and
The first end of the 3rd resistor connects altogether, and the first end of the second end of the second resistance and the first capacitor is connect altogether as institute
The first output end of firewire current sampling circuit is stated, the second end of the 3rd resistor and the first end of second capacitor connect altogether
As the second output terminal of the firewire current sampling circuit, the second of the first end of the first capacitor and second capacitor
End is connected to ground altogether.
6. intelligent electric energy meter safety detection circuit as claimed in claim 3, which is characterized in that the neutral line current sample circuit
It include: zero line mutual inductor, the 4th resistance, the 5th resistance, the 6th resistance, third capacitor and the 4th capacitor；
The zero line mutual inductor is concatenated with the zero curve, the first end of the first end of the zero line mutual inductor, the 4th resistance
And the first end of the 5th resistance connects altogether, the second end of the zero line mutual inductor, the second end of the 4th resistance and
The first end of 6th resistance connects altogether, and the second end of the 5th resistance and the first end of the third capacitor are connect altogether as institute
The first output end of neutral line current sample circuit is stated, the second end of the 6th resistance and the first end of the 4th capacitor connect altogether
As the second output terminal of the neutral line current sample circuit, the second of the first end of the third capacitor and the 4th capacitor
End is connected to ground altogether.
7. intelligent electric energy meter safety detection circuit as claimed in claim 3, which is characterized in that the voltage sampling circuit packet
It includes: the 7th resistance, the 8th resistance, the 9th resistance, the 5th capacitor and the 6th capacitor；
The first end of 7th resistance is connect with the zero curve, and the first end of the 9th resistance is connect with the firewire, institute
The second end, the first end of the 8th resistance and the first end of the 5th capacitor for stating the 7th resistance are connect altogether as the electricity
The first output end of sample circuit is pressed, the second end of the 9th resistance and the first end of the 6th capacitor are connect altogether as described
The second output terminal of voltage sampling circuit, the second end of the 8th resistance, the second end of the 5th capacitor and described
The second end of six capacitors is connected to ground altogether.
8. a kind of intelligent electric energy meter, which is characterized in that examined safely including the described in any item intelligent electric energy meters of claim 1 to 7
Slowdown monitoring circuit.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109358307A (en) * | 2018-11-21 | 2019-02-19 | 深圳深宝电器仪表有限公司 | A kind of intelligent electric energy meter safety detection circuit and intelligent electric energy meter |
| CN111505562A (en) * | 2020-04-29 | 2020-08-07 | 内蒙古电力(集团)有限责任公司 | Test system for metering performance self-monitoring capability of electric energy meter |
-
2018
- 2018-11-21 CN CN201821926642.4U patent/CN209460391U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109358307A (en) * | 2018-11-21 | 2019-02-19 | 深圳深宝电器仪表有限公司 | A kind of intelligent electric energy meter safety detection circuit and intelligent electric energy meter |
| CN111505562A (en) * | 2020-04-29 | 2020-08-07 | 内蒙古电力(集团)有限责任公司 | Test system for metering performance self-monitoring capability of electric energy meter |
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