CN110231512A - Single firewire electric energy metering device - Google Patents
Single firewire electric energy metering device Download PDFInfo
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- CN110231512A CN110231512A CN201910607708.6A CN201910607708A CN110231512A CN 110231512 A CN110231512 A CN 110231512A CN 201910607708 A CN201910607708 A CN 201910607708A CN 110231512 A CN110231512 A CN 110231512A
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- 238000005070 sampling Methods 0.000 claims abstract description 58
- 238000001514 detection method Methods 0.000 claims abstract description 56
- 230000001360 synchronised effect Effects 0.000 claims abstract description 17
- 230000005611 electricity Effects 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 3
- 241001269238 Data Species 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
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- 238000013507 mapping Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0046—Arrangements for measuring currents or voltages or for indicating presence or sign thereof characterised by a specific application or detail not covered by any other subgroup of G01R19/00
- G01R19/0053—Noise discrimination; Analog sampling; Measuring transients
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/133—Arrangements for measuring electric power or power factor by using digital technique
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
- G01R22/10—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods using digital techniques
Abstract
The present invention discloses a kind of single firewire electric energy metering device, including voltage detection device and current acquisition equipment；Voltage detection device is connect with firewire and zero curve respectively, and current acquisition equipment is connect with firewire；Voltage detection device detects the crossover point signal of AC power source on firewire and zero curve, and when detecting crossover point signal, multiple instantaneous voltage values are obtained with the first predeterminated frequency inquiry voltage sine wave tables of data, and is synchronized in each inquiry and sends sampling control signal to current acquisition equipment；Current acquisition equipment is according to the current signal on each sampling control signal synchronous acquisition firewire, and multiple instantaneous current values are obtained, the power data and energy data of the load connected on firewire and zero curve are determined according to multiple instantaneous voltage values and multiple instantaneous current values.Present invention list firewire can realize the power and electrical energy measurement of load, and the power and electrical energy measurement for solving load rely on zero curve, and the problem for causing existing electric energy metering device volume bigger than normal because of safety problem.
Description
Technical field
The present invention relates to electric-power metering technical field, in particular to a kind of single firewire electric energy metering device.
Background technique
With the raising of social development and lives of the people level, the quantity of various electric appliances is more and more, current building energy conservation
Scheme much will carry out measurement in real time and monitoring based on the electricity consumption and load quality that different purposes load, especially two
Grade, the input of three-level or final distribution case or output end carry out the measurement of electricity consumption data to load, and then targetedly
Some energy-efficient measures are taken, for example, being manually controlled to the load of highly energy-consuming, timing controlled etc. is to reduce power loss.
But existing electric energy metering device, it requires zero curve and is just able to achieve with firewire cooperation, it is contemplated that electrical energy measurement
Safety problem needs to keep enough safe spacings between firewire and zero curve, so as to cause existing electric energy metering device volume
Problem bigger than normal.
Summary of the invention
The main object of the present invention is to provide a kind of single firewire electric energy metering device, it is intended to solve the power and electric energy of load
Metering relies on zero curve, and the problem for causing existing electric energy metering device volume bigger than normal because of safety problem.
To achieve the above object, a kind of single firewire electric energy metering device proposed by the present invention includes voltage detection device and electricity
Stream acquisition equipment, the voltage detection device are connect with firewire and zero curve respectively, and the current acquisition equipment and the firewire connect
It connects；
The voltage detection device for detecting the crossover point signal of AC power source on the firewire and zero curve, and is being examined
When measuring the crossover point signal, multiple instantaneous voltage values are obtained with the first predeterminated frequency inquiry voltage sine wave tables of data, and
In each inquiry, the synchronous sampling control signal that sends is to the current acquisition equipment；
The current acquisition equipment, for the electric current on the firewire according to each sampling control signal synchronous acquisition
Signal, and multiple instantaneous current values are obtained, according to multiple instantaneous voltage values and multiple instantaneous current value determinations
The power data and energy data of the load connected on firewire and zero curve.
Preferably, the voltage detection device obtains the voltage sine wave tables of data according to standard sine AC wave shape.
Preferably, the voltage detection device includes the first controller and zero crossing pulse generating circuit, the zero crossing
Pulse generating circuit is connect with the firewire and the zero curve respectively, the first signal output of the zero crossing pulse generating circuit
End is connect with the signal input part of first controller, the second signal output end of the zero crossing pulse generating circuit and institute
State the signal end connection of current acquisition equipment；
The zero crossing pulse generating circuit, for detecting the crossover point signal of AC power source on the firewire and zero curve,
And it exports to first controller；
First controller, for inquiring the electricity with the first predeterminated frequency when getting the crossover point signal
It presses sinusoidal wave data table to obtain multiple instantaneous voltage values, and is synchronized in each inquiry and send sampling control signal to the electric current
Acquire equipment.
Preferably, the current acquisition equipment includes current sampling circuit and second controller；
The current sampling circuit is connect with the firewire, the signal output end of the current sampling circuit and described second
The signal input part of controller connects, the second controller also respectively with the zero crossing pulse generating circuit and described first
Controller connection；
The current sampling circuit, for sampling the current signal on the firewire；
The second controller is more for being obtained from the current sampling circuit according to each sampling control signal
A instantaneous current value determines according to multiple instantaneous voltage values and multiple instantaneous current values and connects on the firewire and zero curve
The power data and energy data of the load connect.
Preferably, the zero crossing pulse generating circuit is zero crossing pulse detection chip.
Preferably, the current sampling circuit includes current transformer and operational amplifier；
The current transformer concatenates on the firewire, the output end of the current transformer and the operational amplifier
Signal input part connection, the signal output end of the operational amplifier are connect with the signal input part of the second controller；
The current transformer for the current signal on the firewire to be carried out ratio conversion, and exports mutual inducing current
Signal；
The operational amplifier, for the mutual inductance current signal to be converted into voltage signal and is exported to second control
Device processed.
Preferably, first controller is the first MCU, and the second controller is the 2nd MCU.
Preferably, the voltage detection device further includes power-switching circuit, the power-switching circuit respectively with it is described
Firewire is connected with the zero curve, the power end of the power output end of the power-switching circuit and first controller and described
The power end of second controller connects；
The power-switching circuit, for the AC power source on the firewire and the zero curve to be carried out voltage conversion, and
At least export all the way DC low voltage power supply to first controller and the second controller, with for first controller and
The second controller provides working power.
Preferably, the voltage detection device further includes the first wireless communication module, and the current acquisition equipment further includes
Second wireless communication module；
First controller, is also used to when getting the crossover point signal, with first predeterminated frequency inquiry
Voltage sine wave tables of data obtains multiple instantaneous voltage values, and by multiple instantaneous voltage values through the first wireless telecommunications mould
Block and second wireless communication module are sent to the second controller.
Preferably, the voltage detection device is also connect with terminal device, the voltage detection device, and being also used to will be described
The power data and energy data of load feed back to terminal device.
Single firewire electric energy metering device of technical solution of the present invention includes voltage detection device and current acquisition equipment, voltage
Detection device is connect with firewire and zero curve respectively, and current acquisition equipment is connect with firewire, and voltage detection device detects firewire and zero
The crossover point signal of AC power source on line, and when detecting crossover point signal, voltage sine wave is inquired with the first predeterminated frequency
Tables of data obtains multiple instantaneous voltage values, and synchronizes in each inquiry and send sampling control signal to current acquisition equipment.
Current acquisition equipment obtains multiple winks according to the current signal on each sampling control signal synchronous acquisition firewire
When current value, the power number of the load connected on firewire and zero curve is determined according to multiple instantaneous voltage values and multiple instantaneous current values
Accordingly and energy data.
Current acquisition equipment passes through the power data and and electricity that single firewire obtains load in single firewire electric energy metering device
Energy data, the power and electrical energy measurement for solving load rely on zero curve, and because safety problem causes existing electrical energy measurement to fill
Set volume problem bigger than normal.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the module diagram of single one embodiment of firewire electric energy metering device of the present invention；
Fig. 2 is the single firewire electric energy metering device waveform sampling schematic diagram of the present invention；
Fig. 3 is the module diagram of another embodiment of the single firewire electric energy metering device of the present invention；
Fig. 4 is the electrical block diagram of one embodiment of operational amplifier in the single firewire electric energy metering device of the present invention；
Fig. 5 is the module diagram of the another embodiment of the single firewire electric energy metering device of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that the description for being related to " first ", " second " etc. in the present invention is used for description purposes only, and cannot understand
For its relative importance of indication or suggestion or implicitly indicate the quantity of indicated technical characteristic.Define as a result, " first ",
The feature of " second " can explicitly or implicitly include at least one of the features.In addition, the "and/or" occurred in full text contains
Justice are as follows: including three schemes arranged side by side, by taking " A/B " as an example, including the scheme that A scheme or B scheme or A and B meet simultaneously, separately
Outside, the technical solution between each embodiment can be combined with each other, can be real with those of ordinary skill in the art but must be
Based on existing, the combination of this technical solution will be understood that not when conflicting or cannot achieve when occurs in the combination of technical solution
In the presence of, also not the present invention claims protection scope within.
The present invention proposes a kind of single firewire electric energy metering device.
As shown in FIG. 1, FIG. 1 is a kind of module diagram of single one embodiment of firewire electric energy metering device of the present invention, this realities
It applies in example, single firewire electric energy metering device includes voltage detection device 100 and current acquisition equipment 200, voltage detection device 100
It is connect respectively with firewire L and zero curve N, current acquisition equipment 200 is connect with firewire L；
Voltage detection device 100 for detecting the crossover point signal of AC power source on firewire L and zero curve N, and is detecting
When crossover point signal, multiple instantaneous voltage values are obtained with the first predeterminated frequency inquiry voltage sine wave tables of data, and looking into every time
The synchronous sampling control signal that sends is to current acquisition equipment 200 when inquiry；
Current acquisition equipment 200, for according to the current signal on each sampling control signal synchronous acquisition firewire L, and
Multiple instantaneous current values are obtained, is determined according to multiple instantaneous voltage values and multiple instantaneous current values and to be connected on firewire L and zero curve N
The power data and energy data of load 300.
In the present embodiment, voltage detection device 100 is used as measurement module, can pass through with current acquisition equipment 200 serial total
Line is attached communication, while voltage sinusoidal tables of data is prestored inside voltage detection device 100, voltage sinusoidal tables of data packet
The corresponding instantaneous voltage data of each moment point in signal period are included.
When needing to obtain 300 power data of load and energy data being connected on firewire L and zero curve N, voltage detecting
Equipment 100 starts to detect the crossover point signal of firewire L and the AC power source on zero curve N, as shown in Fig. 2, crossover point signal conduct
Initial signal is measured, inquires to obtain multiple instantaneous voltage values, the first predeterminated frequency in such a way that the first predeterminated frequency is by tabling look-up
Higher, number of tabling look-up is more, and the voltage waveform of multiple instantaneous voltage values of acquisition composition is closer to sinusoidal waveform, while each
Table look-up when obtaining instantaneous voltage value, the also synchronous sampling control signal that sends of voltage detection device 100 to current acquisition equipment 200,
Crossover point signal is also used as the initial signal of current sample simultaneously, and current acquisition equipment 200 is controlled according to crossover point signal and sampling
Signal processed starts to obtain the current signal on firewire L, and voltage is tabled look-up, and movement is synchronous with current sample to be carried out, to obtain each phase
With the instantaneous voltage value and instantaneous current value at time point, current acquisition equipment 200 obtains in signal period according to integral algorithm
Load 300 power datas and energy data, and so on, it is elapsed according to the time, the energy data in preset time can be obtained.
Further, voltage detection device 100 obtains multiple real-time voltages in signal period also with the first predeterminated frequency
Signal, and multiple voltage signals to be output are corrected according to multiple real-time voltage linearly, current acquisition equipment 200 is according to repairing
Voltage value and current value after changing obtain the real power of final electricity consumption.
Meanwhile current acquisition equipment 200 is after the power data and energy data for obtaining load 300, it is also all to preset
The power data and energy data that load 300 by serial bus are fed back to voltage detection device 100 in real time by the phase.
In one embodiment, display module (figure is further respectively had in voltage detection device 100 and current acquisition equipment 200
It is not shown), for showing collected voltage value, current value, power data, energy data, frequency etc. of tabling look-up respectively.
Current acquisition equipment 200 is connect with firewire L, and load 300 is connected on same firewire L with current acquisition equipment 200,
Load 300 is also connect with zero curve N simultaneously, and current acquisition equipment 200 can obtain 300 power datas of load without relying on zero curve N
And energy data, problem of signal attenuation is avoided by the acquisition modes of digital quantity, each mould will not be needed because of transmission line impedance
Block correction, it is not easy to because the interference of transmission line causes to calculate deviation, while the sampling electricity to voltage signal is saved in each equipment
Road, therefore, the volume of current acquisition equipment 200 can design smaller, reduce design cost, thus solve load power and
Electrical energy measurement relies on zero curve, and because of the problem that safety problem causes existing electric energy metering device volume bigger than normal, improves electricity
The reliability and applicability of stream acquisition equipment 200.
Also, between current acquisition equipment 200 and load 300 can one-to-one or one-to-many setting, therefore, current acquisition
The quantity of equipment 200 can be one or more, selected with specific reference to 300 quantity of load and measuring requirement, do not done herein
Concrete restriction.
When current acquisition equipment 200 is provided with multiple, voltage detection device 100 and hithermost current acquisition equipment
200 connections, multiple current acquisition equipment 200 successively cascade, synchronous to receive sampling control signal, i.e. voltage detection device 100 is sent out
Sampling control signal out is sent to hithermost current acquisition equipment 200, and current acquisition equipment 200 turns sampling control signal
Next current acquisition equipment 200 is issued, until the last one current acquisition equipment 200, to realize the synchronization of current signal
Sampling.
Single firewire electric energy metering device of technical solution of the present invention includes voltage detection device 100 and current acquisition equipment
200, voltage detection device 100 is connect with firewire L and zero curve N respectively, and current acquisition equipment 200 is connect with firewire L, voltage detecting
Equipment 100 detects the crossover point signal of AC power source on firewire L and zero curve N, and when detecting crossover point signal, pre- with first
If frequency queries voltage sine wave tables of data obtains multiple instantaneous voltage values, and the synchronous transmission controlling of sampling letter in each inquiry
Number to current acquisition equipment 200.
Current acquisition equipment 200 obtains more according to the current signal on each sampling control signal synchronous acquisition firewire L
A instantaneous current value determines the load connected on firewire L and zero curve N according to multiple instantaneous voltage values and multiple instantaneous current values
300 power data and energy data.
In single firewire electric energy metering device current acquisition equipment 200 pass through single firewire obtain load 300 power data and
And energy data, current acquisition equipment 200 are not necessarily to while connecting firewire L and zero curve N, solve the power and electric energy meter of load
Amount relies on zero curve, and the problem for causing existing electric energy metering device volume bigger than normal because of safety problem.
Specifically, voltage detection device 100 obtains voltage sine wave tables of data according to standard sine AC wave shape.
It should be noted that voltage detection device 100 obtains signal period standard sine AC wave shape before measuring
In different time points voltage value, thus obtain the time and instantaneous voltage value mapping voltage sine wave tables of data, according to
Different frequencies of tabling look-up can obtain the instantaneous voltage value of different time points, and number of tabling look-up in signal period is more, acquisition it is instantaneous
The voltage waveform that voltage value is formed is closer to sine waveform, and finally determining power is more accurate, and voltage detection device 100 is tabled look-up
Frequency, i.e. the first predeterminated frequency can be arranged according to demand, be not particularly limited herein.
As shown in figure 3, in one embodiment, voltage detection device 100 includes that the first controller 120 and zero crossing pulse are sent out
Raw circuit 110, zero crossing pulse generating circuit 110 are connect with firewire L and zero curve N respectively, zero crossing pulse generating circuit 110
First signal output end is connect with the signal input part of the first controller 120, the second signal of zero crossing pulse generating circuit 110
Output end is connect with the signal end of current acquisition equipment 200；
Zero crossing pulse generating circuit 110, for detecting the crossover point signal of AC power source on firewire L and zero curve N, and it is defeated
Out to the first controller 120；
First controller 120, for inquiring voltage sinusoidal wave number with the first predeterminated frequency when getting crossover point signal
Multiple instantaneous voltage values are obtained according to table, and is synchronized in each inquiry and sends sampling control signal to current acquisition equipment 200.
In the present embodiment, for the tool of zero crossing pulse generating circuit 110 there are two function, a function is detection firewire L and zero
The crossover point signal of AC power source on line N, and crossover point signal is sent to the first controller 120 and current acquisition equipment 200,
Initial signal of the crossover point signal as 100 voltage sample of voltage detection device and the current sample of current acquisition equipment 200, together
When, voltage detection device 100 also passes through zero crossing pulse generating circuit 110 in each inquiry and sends sampling control signal
To current acquisition equipment 200, current acquisition equipment 200 believes the electric current on firewire L with identical frequency according to sampling control signal
It number is sampled.
First controller 120 inquires voltage sine wave tables of data when getting crossover point signal, with the first predeterminated frequency
Multiple instantaneous voltage values are obtained, and instantaneous voltage value is sent to current acquisition equipment 200 by serial bus, realize sampling letter
Number transmitting.
In the present embodiment, zero crossing pulse generating circuit 110 can be zero crossing pulse detection chip, or by triode and
The zero crossing pulse generating circuit 110 of other components composition, can specifically be selected, according to demand in a specific embodiment
In, zero crossing pulse generating circuit 110 is zero crossing pulse detection chip.
Please continue to refer to Fig. 3, current acquisition equipment 200 includes current sampling circuit 210 and second controller 220；
Current sampling circuit 210 is connect with firewire L, the signal output end and second controller 220 of current sampling circuit 210
Signal input part connection, second controller 220 also connects with zero crossing pulse generating circuit 110 and the first controller 120 respectively
It connects；
Current sampling circuit 210, for sampling the current signal on firewire L；
Second controller 220, it is multiple instantaneous for being obtained from current sampling circuit 210 according to each sampling control signal
Current value determines the function of the load 300 connected on firewire L and zero curve N according to multiple instantaneous voltage values and multiple instantaneous current values
Rate data and energy data.
In the present embodiment, current signal on 210 real-time sampling firewire L of current sampling circuit, and current signal is sent
To second controller 220, second controller 220 is according to sampling control signal with frequency of tabling look-up identical with voltage detection device 100
Rate obtains multiple instantaneous current values on firewire L, when each instantaneous current value acquisition time point and voltage detection device 100 are tabled look-up
Between put and synchronize, and determined according to multiple instantaneous voltage values and multiple instantaneous current values by integral algorithm and connected on firewire L and zero curve N
The power data and energy data of the load 300 connect.
In the present embodiment, sampling resistor, current transformer etc. is may be selected in current sampling circuit 210, with specific reference to practical need
It asks and is selected, due to needing to shunt using sampling resistor, will affect 300 working current values of load, therefore, in a specific implementation
In example, current sampling circuit 210 is made of current transformer (not shown go out) and operational amplifier U1, as shown in figure 4, electric current is mutual
Sensor concatenates on firewire L, and the output end of current transformer is connect with the signal input part of operational amplifier U1, operational amplifier U1
Signal output end connect with the signal input part of second controller 220；
Current transformer for the current signal on firewire L to be carried out ratio conversion, and exports mutual inductance current signal；
Operational amplifier U1, for mutual inductance current signal to be converted into voltage signal and is exported to second controller 220.
Current transformer is serially connected on firewire L, secondary can generate one it is corresponding with no-load voltage ratio export electric current, put by operation
Current signal is converted into voltage signal by big device U1, and operational amplifier U1 can also connect feedback resistance Rf, by adjusting feedback electricity
The value of resistance can be obtained required voltage value in output end, operational amplifier U1 output end can also shunt capacitance, for compensating phase
It moves.
In one embodiment, the first controller 120 is the first MCU, and second controller 220 is the 2nd MCU.
In the present embodiment, serial bus is connected between the first MCU and the 2nd MCU, and the first MCU is for getting zero crossing
When signal, multiple instantaneous voltage values are obtained with the first predeterminated frequency inquiry voltage sine wave tables of data, while by multiple instantaneous electricity
Pressure value is sent to the 2nd MCU, and the synchronous sampling control signal that sends passes through zero crossing pulse generating circuit 110 in each inquiry
It is sent to the 2nd MCU, the 2nd MCU obtains multiple transient currents according to each sampling control signal from current sampling circuit 210
Value, the power number of the load 300 connected on firewire L and zero curve N is determined according to multiple instantaneous voltage values and multiple instantaneous current values
Accordingly and energy data.
Further, it can also wirelessly be communicated between the first controller 120 and second controller 220, from
And the wiring between voltage detection device 100 and current acquisition equipment 200 is reduced, as shown in figure 5, in one embodiment,
Voltage detection device 100 further includes the first wireless communication module 140, and current acquisition equipment 200 further includes the second wireless telecommunications mould
Block 230；
First controller 120, is also used to when getting crossover point signal, inquires voltage sine wave with the first predeterminated frequency
Tables of data obtains multiple instantaneous voltage values, and by multiple instantaneous voltage values through the first wireless communication module 140 and the second channel radio
It interrogates module 230 and sends second controller 220.
Wireless communication module can be for WIFI, Internet of Things, bluetooth etc., specifically can corresponding selection according to demand.
Please continue to refer to Fig. 5, in an alternative embodiment, voltage detection device 100 further includes power-switching circuit 130,
Power-switching circuit 130 is connect with firewire L and zero curve N respectively, the power output end of power-switching circuit 130 and the first controller
120 power end is connected with the power end of second controller 220；
Power-switching circuit 130 for the AC power source on firewire L and zero curve N to be carried out voltage conversion, and at least exports
DC low voltage power supply is to the first controller 120 and second controller 220 all the way, for the first controller 120 and second controller
220 provide working power.
Power-switching circuit 130 includes Transformer Rectifier filter circuit, voltage regulator circuit etc., for becoming AC power source
The work such as rectifying and wave-filtering, pressure stabilizing are pressed, and then export the working power of the first controller 120 and second controller 220.
Further, voltage detection device 100 can also be connect by wireless or APP mode with terminal device, and terminal is set
Standby can be PC terminal, computer, mobile phone etc., and user can send inquiry signal to voltage detection device 100, voltage by terminal device
Power data and energy data that current acquisition equipment 200 obtains are fed back to terminal according to inquiry signal and set by detection device 100
It is standby.
List firewire electric energy metering device provided by the invention, can be widely applied to breaker and various electric energy measurement instruments produce
Product.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all at this
Under the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectly
It is included in other related technical areas in scope of patent protection of the invention.
Claims (10)
1. a kind of list firewire electric energy metering device, which is characterized in that including voltage detection device and current acquisition equipment, the electricity
Pressure detection device is connect with firewire and zero curve respectively, and the current acquisition equipment is connect with the firewire；
The voltage detection device for detecting the crossover point signal of AC power source on the firewire and zero curve, and is detecting
When the crossover point signal, multiple instantaneous voltage values are obtained with the first predeterminated frequency inquiry voltage sine wave tables of data, and every
The synchronous sampling control signal that sends is to the current acquisition equipment when secondary inquiry；
The current acquisition equipment, the electric current letter on the firewire according to each sampling control signal synchronous acquisition
Number, and multiple instantaneous current values are obtained, the fire is determined according to multiple instantaneous voltage values and multiple instantaneous current values
The power data and energy data of the load connected on line and zero curve.
2. list firewire electric energy metering device as described in claim 1, which is characterized in that the voltage detection device is according to standard
Sinusoidal AC wave form obtains the voltage sine wave tables of data.
3. list firewire electric energy metering device as described in claim 1, which is characterized in that the voltage detection device includes first
Controller and zero crossing pulse generating circuit, the zero crossing pulse generating circuit connect with the firewire and the zero curve respectively
It connects, the first signal output end of the zero crossing pulse generating circuit is connect with the signal input part of first controller, institute
The second signal output end for stating zero crossing pulse generating circuit is connect with the signal end of the current acquisition equipment；
The zero crossing pulse generating circuit, for detecting the crossover point signal of AC power source on the firewire and zero curve, and it is defeated
Out to first controller；
First controller, for inquiring the voltage just with the first predeterminated frequency when getting the crossover point signal
String wave tables of data obtains multiple instantaneous voltage values, and synchronizes in each inquiry and send sampling control signal to the current acquisition
Equipment.
4. list firewire electric energy metering device as claimed in claim 3, which is characterized in that the current acquisition equipment includes electric current
Sample circuit and second controller；
The current sampling circuit is connect with the firewire, the signal output end of the current sampling circuit and second control
The signal input part of device connects, and the second controller is also controlled with the zero crossing pulse generating circuit and described first respectively
Device connection；
The current sampling circuit, for sampling the current signal on the firewire；
The second controller, for obtaining multiple winks from the current sampling circuit according to each sampling control signal
When current value, determined according to multiple instantaneous voltage values and multiple instantaneous current values and to be connected on the firewire and zero curve
The power data and energy data of load.
5. list firewire electric energy metering device as claimed in claim 4, which is characterized in that the zero crossing pulse generating circuit is
Zero crossing pulse detection chip.
6. list firewire electric energy metering device as claimed in claim 4, which is characterized in that the current sampling circuit includes electric current
Mutual inductor and operational amplifier；
The current transformer concatenates on the firewire, the signal of the output end of the current transformer and the operational amplifier
Input terminal connection, the signal output end of the operational amplifier are connect with the signal input part of the second controller；
The current transformer for the current signal on the firewire to be carried out ratio conversion, and exports mutual inductance current signal；
The operational amplifier, for the mutual inductance current signal to be converted into voltage signal and is exported to second control
Device.
7. list firewire electric energy metering device as claimed in claim 4, which is characterized in that first controller is the first MCU,
The second controller is the 2nd MCU.
8. list firewire electric energy metering device as claimed in claim 4, which is characterized in that the voltage detection device further includes electricity
Power-switching circuit, the power-switching circuit are connect with the firewire and the zero curve respectively, the electricity of the power-switching circuit
Source output terminal is connect with the power end of the power end of first controller and the second controller；
The power-switching circuit, for the AC power source on the firewire and the zero curve to be carried out voltage conversion, and at least
DC low voltage power supply is to first controller and the second controller all the way for output, for first controller and described
Second controller provides working power.
9. list firewire electric energy metering device as claimed in claim 4, which is characterized in that the voltage detection device further includes the
One wireless communication module, the current acquisition equipment further include the second wireless communication module；
First controller, is also used to when getting the crossover point signal, inquires voltage with first predeterminated frequency
Sinusoidal wave data table obtains multiple instantaneous voltage values, and will multiple instantaneous voltage values through first wireless communication module with
Second wireless communication module is sent to the second controller.
10. list firewire electric energy metering device as claimed in claim 4, which is characterized in that the voltage detection device also with end
End equipment connection, the voltage detection device are also used to the power data of the load and energy data feeding back to terminal and set
It is standby.
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