CN110531154A - Energy metering device and method - Google Patents
Energy metering device and method Download PDFInfo
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- CN110531154A CN110531154A CN201910915585.2A CN201910915585A CN110531154A CN 110531154 A CN110531154 A CN 110531154A CN 201910915585 A CN201910915585 A CN 201910915585A CN 110531154 A CN110531154 A CN 110531154A
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- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000005259 measurement Methods 0.000 claims abstract description 49
- 238000012360 testing method Methods 0.000 claims abstract description 6
- 238000002955 isolation Methods 0.000 claims description 21
- 230000005611 electricity Effects 0.000 claims description 10
- 239000003990 capacitor Substances 0.000 claims description 6
- 229910044991 metal oxide Inorganic materials 0.000 claims description 4
- 150000004706 metal oxides Chemical class 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 4
- 230000003044 adaptive effect Effects 0.000 abstract description 6
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- 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 disclosure proposes a kind of energy metering device and method, is related to energy monitor technical field.A kind of energy metering device of the disclosure includes: to connect with tested power supply, acquires the current value of circuit-under-test and the acquisition device of voltage value；With, the master chip being connect with acquisition device signal, the data that acquisition device acquires are converted digital signal encoding by master chip, and the metering method that energy meter is carried out according to digital signal encoding is determined according to the zeroaxial quantity of digital signal encoding, and carry out energy measurement, wherein, metering method includes alternating current metering and direct current metering.Such energy measurement device can convert digital signal for the data of acquisition, and judge to determine power supply as direct current or exchange, and then corresponding energy measurement mode is selected, so as to switch metering method in real time in the case where the energy switches, improve the adaptive degree of energy measurement.
Description
Technical field
This disclosure relates to energy monitor technical field, especially a kind of energy metering device and method.
Background technique
Energy measurement generally comprise to electric energy, wind energy, it is interior can etc. a series of energy metering, the purpose of metering be in order to
The enough information for obtaining the various energy in real time, wherein the metering of electric energy is most commonly seen.Mainstream metering product is most in the market
It is the metering to alternating current 220V alternating current.
Summary of the invention
One purpose of the disclosure is to improve the adaptive ability and expanded application range of energy meter.
According to one aspect of the disclosure, a kind of energy metering device is proposed, comprising: connect with tested power supply, acquire quilt
The current value of slowdown monitoring circuit and the acquisition device of voltage value；With, the master chip connecting with acquisition device signal, master chip will acquisition dress
The data for setting acquisition are converted into digital signal encoding, and are determined according to the zeroaxial quantity of digital signal encoding according to digital signal
Coding carries out the metering method of energy meter, and carries out energy measurement, wherein metering method includes alternating current metering and direct current
Metering.
In some embodiments, energy metering device further include: the first power supply connecting with tested power supply and master chip is single
Member, converts the voltage of tested power supply to the operating voltage of master chip, and is supplied to master chip.
In some embodiments, energy metering device further include: connect with master chip signal, receive the energy from master chip
Source metrical information and the display unit shown.
In some embodiments, energy metering device further include: positioned at the power supply circuit of tested power supply, control power supply circuit
The switch unit of on-off；The switch control terminal of switch unit is connect with master chip；Master chip also sends the first electricity to switch unit
Flat or second electrical level electric signal, with the on-off of control switch unit.
In some embodiments, energy metering device further include: unit is provided with master chip signal connection signal, to main core
Piece sends the electric signal of the first level or second electrical level；The electric signal for providing power supply from signal is sent to switch list by master chip
The switch control terminal of member.
In some embodiments, energy metering device further include: the second power supply being connect with tested power supply and switch unit
Unit, converts the voltage of tested power supply to the operating voltage of switch unit, and is supplied to switch unit.
In some embodiments, switch unit includes: the first N-type metal-oxide semiconductor (MOS) NMOS transistor, and first
The grid of NMOS transistor is connected to switch control terminal, the drain electrode of the first NMOS transistor and P type metal oxide semiconductor
The grid of PMOS transistor connects, and the source electrode of the first NMOS transistor connects the first ground；PMOS transistor, the leakage of PMOS transistor
Pole is connect with the first supply voltage, the grid and third NMOS transistor of the source electrode of PMOS transistor and the second NMOS transistor
Grid is separately connected；The drain electrode of second NMOS transistor, the second NMOS transistor is connect with first input end, the 2nd NMOS crystal
The source electrode of pipe connects the first ground；Third NMOS transistor, the drain electrode of third NMOS transistor are connect with the first output end, third
The source electrode of NMOS transistor connects the first ground, wherein for connecting load branch between first input end and the first output end.
In some embodiments, switch unit further include: isolation signals chip, signal input part and switch control terminal connect
It connects, signal output end is connect with the grid of the first NMOS transistor, and input side ground terminal is connect with the second, and output flanks
Ground terminal is connect with the first.
In some embodiments, the voltage input end of isolation signals chip and voltage output end all connect with the second supply voltage
It connects, is respectively connected to filtered electrical between the input side ground terminal and outlet side ground terminal of the second supply voltage and isolation signals chip
Hold；Or, between the signal input part and voltage input end of isolation signals chip and between signal output end and voltage output end
All access pull-up resistor.
In some embodiments, energy metering device further includes at least one of following: the drain electrode of the first NMOS transistor with
Pull-up resistor is accessed between the drain electrode of PMOS transistor；The grid and third of the source electrode of PMOS transistor and the second NMOS transistor
The first ground is accessed by pull down resistor after the grid connection of NMOS transistor；Filtering is accessed between first supply voltage and the first ground
Capacitor；Or load branch includes concatenated power supply and load, power supply connects first input end, load the first output end of connection.
In some embodiments, when master chip sends the electric signal of the first level to switch unit, it is tested the power supply of power supply
Circuit is in the conductive state；When master chip sends the electric signal of second electrical level to switch unit, it is tested at the power supply circuit of power supply
In off-state；Wherein, the first level is higher than second electrical level.
In some embodiments, measuring parameter includes: voltage, electric current, active power, reactive power, apparent energy, power
One of factor, active energy or reactive energy are a variety of.
Such energy measurement device can real-time monitoring collection voltages, current data, and be converted into digital signal, pass through
Zeroaxial quantity judges to determine that power supply as direct current or exchange, and then selects corresponding energy measurement mode, so as in energy
Source switches metering method in the case where switching in real time, improves the adaptive degree of energy measurement；It can be to direct current and alternating current
It is measured, extends the application range of equipment.
According to the one aspect of other embodiments of the disclosure, propose a kind of energy meter method, comprising: by with quilt
Survey the current value and voltage value of the acquisition device acquisition circuit-under-test of power supply connection；Pass through the main core connecting with acquisition device signal
The data that acquisition device acquires are converted digital signal encoding by piece, and is sent to judging unit；Believed with master chip according to number
The zeroaxial quantity of number coding determines the metering method that energy meter is carried out according to digital signal encoding, and carries out energy measurement,
Wherein, metering method includes alternating current metering and direct current metering.
In some embodiments, energy meter method further include: provide unit by the signal connecting with master chip signal
The electric signal of the first level or second electrical level is sent to master chip；Master chip sends the first level or second electrical level to switch unit
Electric signal, with the on-off of control switch unit, wherein switch unit is located at the power supply circuit of tested power supply, control power supply electricity
Road on-off.
In some embodiments, energy meter method further includes at least one of following: by the first power supply unit receive come
From the electric energy of tested power supply, master chip is supplied to after converting voltage to the operating voltage of master chip；Or it is single by the second power supply
Member receives the electric energy from tested power supply, converts voltage to the operating voltage of switch unit, and be supplied to switch unit.
In some embodiments, control power supply circuit on-off includes: the telecommunications by sending the first level to switch unit
Number control power supply circuit it is in the conductive state；Power supply circuit is controlled in disconnection shape by sending second electrical level to switch unit
State；Wherein, the first level is higher than second electrical level.
By such method, can real-time monitoring collection voltages, current data, and be converted into digital signal, passed through
Zero point quantity judges to determine that power supply as direct current or exchange, and then selects corresponding energy measurement mode, so as in the energy
Switch metering method in the case where switching in real time, improves the adaptive degree of energy measurement；Can to direct current and alternating current into
Row metering, extends the application range of equipment.
Detailed description of the invention
Attached drawing described herein is used to provide further understanding of the disclosure, constitutes a part of this disclosure, this public affairs
The illustrative embodiments and their description opened do not constitute the improper restriction to the disclosure for explaining the disclosure.In the accompanying drawings:
Fig. 1 is the schematic diagram of some embodiments of the energy measurement device of the disclosure.
Fig. 2 is the schematic diagram of other embodiments of the energy measurement device of the disclosure.
Fig. 3 is the schematic diagram of some embodiments of switch unit in the energy measurement device of the disclosure.
Fig. 4 is the flow chart of some embodiments of the energy measurement method of the disclosure.
Specific embodiment
Below by drawings and examples, the technical solution of the disclosure is described in further detail.
The schematic diagram of some embodiments of the energy measurement device of the disclosure is as shown in Figure 1.
Acquisition device 1 acquires electric current, the voltage value of tested power supply, and collected data are sent to and are connect with own signal
Master chip 2.Tested power supply 3 can be AC power source, be also possible to DC power supply.The number that master chip 2 acquires acquisition device 1
According to being converted into digital signal encoding.In some embodiments, digital signal encoding can be 16 scale codings, to improve data
Transmission speed.Master chip 2 determines that tested power supply type is alternating current or direct current according to the zeroaxial quantity of digital signal encoding
Electricity, and then matched energy measurement mode is selected to carry out energy measurement.It in some embodiments, can be with preset frequency testing number
The zeroaxial quantity of word Signal coding, such as to detect a zeroaxial quantity within two ac frequency periods.If zero crossing
Quantity is more than or equal to predetermined quantity threshold value, it is determined that tested power supply is AC power source, carries out energy meter using exchange metering method
Amount；If zeroaxial quantity is less than predetermined quantity threshold value, it is determined that tested power supply is DC power supply, is carried out using DC measurement mode
Energy measurement.In some embodiments, predetermined quantity threshold value can be the positive integer more than or equal to 1.In some embodiments, it examines
Consider the stable case of power supply, DC power supply can be used, initial predetermined quantity threshold value is tested for 0, according to the standard of operation
True property gradually increases predetermined quantity threshold value.
Such energy measurement device can real-time monitoring collection voltages, current data, and be converted into digital signal, pass through
Zeroaxial quantity judges to determine that power supply as direct current or exchange, and then selects corresponding energy measurement mode, so as in energy
Source switches metering method in the case where switching in real time, improves the adaptive degree of energy measurement；Can be applied to direct current or
Under the metering scene of alternating current, the application range of equipment is extended.
Zero passage points are carried out again since master chip can convert the voltage of acquisition, current data to after digital signal data
Amount analysis, reduces facility load, improves analysis efficiency, while avoiding accidental effect of jitter judging result, improves accuracy.
In some embodiments, master chip can be realized by single-chip microcontroller (the MSP430 chip of such as Texas Instrument).
In some embodiments, energy measurement device further includes display unit, can show the information from master chip, such as
Energy measurement result, tested power supply type etc. can also include in some embodiments digital signal encoding, so that user is straight
The observation of sight.Master chip 2 may include wireless interaction module, and master chip sends number to display unit by wireless interaction module
Signal coding.Such energy measurement device can show energy measurement as a result, facilitating carry out human-computer interaction, be also convenient for user's root
It makes a response in time according to metric results.
In some embodiments, as shown in Figure 1, energy measurement device can also include power supply unit 4.Power supply unit 4 can
Think switching circuit, connect with tested power supply, the voltage of tested power supply can be converted to other voltages to be other cores
Piece, unit power supply.In some embodiments, power supply unit 4 can be the first power supply unit, connect with master chip, by tested electricity
The voltage in source is converted into the operating voltage (such as 5V) of master chip, and is supplied to master chip.
Such energy measurement device can obtain electric energy and after conversion to the core of metering device from tested power supply
Piece provides stable power supply, without providing extra work power supply, reduces the use complexity and use condition of equipment.
In some embodiments, as shown in Fig. 2, energy measurement device can also include switch unit, it is located at tested power supply
On the power supply circuit powered outward.Cut-out switch unit can prevent tested power supply from powering outward.In some embodiments, it switchs
The switch control terminal of unit is connect with master chip, and the electric signal control issued according to master chip is turned on or off.In some implementations
In example, when master chip sends the electric signal of the first level to switch unit, switching means conductive is tested the power supply circuit of power supply
It is in the conductive state；When master chip sends second electrical level to switch unit, switch unit cutting is tested the power supply circuit of power supply
It is in an off state；Wherein, the first level is higher than second electrical level.In some embodiments, can by signal provide unit to
Master chip provides the electric signal of the first level or second electrical level, sends signal to master chip such as by way of wireless transmission, main
Chip sends electric signal to switch unit.In some embodiments, the display unit being mentioned above can be computer 6, letter
Number providing unit is also computer 6, and by wireless interaction between computer and master chip, user obtains master chip hair by screen
The energy measurement information for giving computer sends electric signal to master chip by computer with the on-off of control switch unit.
Such energy measurement device can control the power supply state of tested power supply, such as be determined according to energy measurement result
Cut off the power power supply or turn-on power power supply to realize according to the feedback controls of metric results improves the available of metric results
The controllability of property and circuit.In some embodiments, switch unit is located at the confession of tested power supply (in the case where being AC power source)
On the firewire of circuit, to improve circuit safety.
In some embodiments, energy metering device can also include the second power supply unit, single with tested power supply and switch
Member connection, converts the voltage of tested power supply to the operating voltage of switch unit, and be supplied to switch unit.In some embodiments
In, power supply unit 4 can be connect with tested power supply, switch unit and master chip, and tested supply voltage is converted into master chip electricity
It is supplied to master chip 2 after pressure, is supplied to switch unit 5 after tested supply voltage is converted into 5 voltage of switch unit (such as 12V),
To make switch unit also not need additional power supply unit, the use complexity and use condition of equipment are reduced.
In some embodiments, switch unit 5 can be photoelectric coupled circuit.In further embodiments, switch unit 5 can be with
As shown in Figure 3.Switch unit includes: the first NMOS transistor U1, PMOS transistor U4, the second NMOS transistor U2, third
NMOS transistor U3, it is also an option that property include resistance and capacitor of isolation signals chip UND and some suitabilities etc..
In some embodiments, the grid of the first NMOS transistor U1 is connected to switch control terminal CONTROL, the first NMOS
The drain electrode of transistor U1 is connect with the grid of PMOS transistor U4, and the source electrode of the first NMOS transistor U1 connects the first ground GGND；
The drain electrode of PMOS transistor U4 is connect with the first supply voltage V1, the source electrode of PMOS transistor U4 and the second NMOS transistor U2's
The grid of grid and third NMOS transistor U3 are separately connected；The drain electrode of second NMOS transistor U2 and first input end PV+_IN
The source electrode of connection, the second NMOS transistor U2 connects the first ground GGND；The drain electrode of third NMOS transistor U3 and the first output end
The source electrode of PV+_OUT connection, third NMOS transistor U3 connects the first ground GGND, wherein first input end PV+_IN and first
For connecting load branch between output end PV+_OUT.Load branch is for example including concatenated power supply and load.Power supply is connected to
Between first input end PV+_IN and the second input terminal PV-_IN, load is connected to the output of the first output end PV+_OUT and second
It holds between PV-_OUT.Power supply is the forceful electric power of AC or DC.The second input terminal PV-_IN and second output terminal PV-_OUT it
Between can also access resistance (such as R9, R10), to play a protective role.
In some embodiments, pull-up is accessed between the drain electrode of the first NMOS transistor U1 and the drain electrode of PMOS transistor U4
Resistance (such as R3, R4, R5), so as to by signal clamper in high level.R3, R4, R5 are for example 200 ohm, and the disclosure is to resistance value
Without limitation.
In some embodiments, the grid and the 3rd NMOS of the source electrode of PMOS transistor U4 and the second NMOS transistor U2 are brilliant
Body pipe U3 grid connection after by pull down resistor (such as R6, R7, R8) access the first ground GGND, so as to by signal clamper in low electricity
It is flat.R6, R7, R8 are for example 200 ohm, the disclosure to resistance value without limitation.
In some embodiments, filter capacitor (such as C3, C4) is accessed between the first supply voltage V1 and the first ground GGND, used
To be filtered.The capacitance of C3, C4 for example be respectively 100nF and 2.2uF, the disclosure to capacitance without limitation.
In some embodiments, isolation signals chip UND can also be arranged in switch unit, by the first ground of driving circuit
DGND (light current) is isolated GGND (forceful electric power) with the second, optimizes switch unit, it is possible to reduce fault.Isolation
Signal chip UND can be realized signal isolation function, the chip be, for example, IC_COMM_SN1506011DWR or
ADUM131E1BRWZ etc., the disclosure do not limit specific chip model.
Isolation signals chip UND, signal input part INA are connect with switch control terminal CONTROL, signal output end
OUTA is connect with the grid of the first NMOS transistor U1, and DGND is connect input side ground terminal GND1 with the second, outlet side
GGND is connect ground terminal GND2 with the first.The output level and its signal of the signal output end OUTA of isolation signals chip UND
The incoming level of input terminal INA is consistent.
The voltage input end VCC1 and voltage output end VCC2 of isolation signals chip UND connects with the second supply voltage V2
It connects, divides between the second supply voltage V2 and the input side ground terminal GND1 and outlet side ground terminal GND2 of isolation signals chip UND
Not Jie Ru filter capacitor (such as C1, C2), to be filtered.The capacitance of C1, C2 are, for example, 100nF, and the disclosure is to capacitance
Without limitation.
In some embodiments, the second supply voltage V2 is less than the first supply voltage V1.First supply voltage V1 is, for example,
Direct current 12V, the second supply voltage V2 are, for example, direct current 3.3V.
In some embodiments, between the signal input part INA and voltage input end VCC1 of isolation signals chip UND and
Pull-up resistor (such as R2, R1) is all accessed between signal output end OUTA and voltage output end VCC2, so as to by signal clamper in height
Level.The resistance value of R2, R1 are, for example, 1k, the disclosure to resistance value without limitation.
In addition, isolation signals chip UND also reserves some pins, such as INB, OUTC, NC, OUTB, INC, the pipe such as NC, EN
Foot needs that some functions can be extended by these pins and its control according to business.
When switch control terminal CONTROL inputs the first level, first input end PV+_IN and the first output end PV+_OUT
In connected state；When switch control terminal CONTROL inputs second electrical level, first input end PV+_IN and the first output end PV
+ _ OUT is in an off state；Wherein, the first level is higher than second electrical level, and the first level is preset high level " 1 ", the second electricity
It puts down as preset low level " 0 ".
The working principle of switch unit is described below.
In the initial state, i.e., when not carrying out switch control, PV-_IN is connected with PV-_OUT, and PV+_IN and PV+_
OUT is disconnected, and power supply can not powering load at this time.
When switch control terminal CONTROL input high level " 1 ", after isolation signals chip UND, in the first NMOS crystalline substance
Sufficiently large voltage is generated between the grid of body pipe U1, source electrode is connected the first NMOS transistor U1 high level, so that first
GGND is connected to the source electrode of NMOS transistor U1 with the first, the drain electrode of the first NMOS transistor U1 and the grid of PMOS transistor U4
It is connected, then the grid input of PMOS transistor U4 is level "0", and the voltage between the grid of PMOS transistor U4, source electrode is small at this time
In 0, so that PMOS transistor U4 low level is connected, the first supply voltage V1 (such as 12V input voltage) and the second NMOS transistor
The grid of U2 and the grid of third NMOS transistor U3 are connected, so that the second NMOS transistor U2 and the 3rd NMOS is brilliant
The conducting of body pipe U3 high level, then PV+_IN is by the drain electrode of the second NMOS transistor U2 and the drain electrode of third NMOS transistor U3
It is connected to PV+_OUT.That is, PV+_IN is connected to PV+_OUT at this time, switch is opened, and power supply can be with powering load.Wherein,
By the first supply voltage V1, (such as 12V is greater than second to the grid voltage of second NMOS transistor U2 and third NMOS transistor U3
Supply voltage V2) it provides, the driving capability of switch unit can be improved.
When switch control terminal CONTROL input low level " 0 ", after isolation signals chip UND, in the first NMOS crystalline substance
High level can not be generated between the grid of body pipe U1, source electrode is connected the first NMOS transistor U1 high level.That is, PV at this time
+ _ is in an off state between IN and PV+_OUT, and switch disconnects, and power supply can not powering load.
In such energy measurement device, the combination of " MOS transistor " is utilized to realize switch unit, no matter tested power supply is
Exchange or direct current will not influence the on-off of switch unit.By isolation signals chip by the first ground of driving circuit (as by force
Electric ground) it is isolated (such as light current) with the second, optimize switch unit, it is possible to reduce fault makes its pressure voltage more
Greatly, conducting electric current is bigger, and on-off effect rate is higher.
In some embodiments, as shown in Fig. 2, measuring parameter may include when energy measurement device carries out energy measurement
One of voltage, electric current, active power, reactive power, apparent energy, power factor, active energy or reactive energy are more
Kind.
Such energy measurement device can carry out the metering of multiple angles to alternating current and direct current electricity, improve energy measurement
It is comprehensive.
Based on energy measurement device as shown in the figures 1 and 2, the process of some embodiments of the energy measurement method of the disclosure
Figure is as shown in Figure 4.
In step 401, the current value and voltage value of circuit-under-test are acquired by the acquisition device connecting with tested power supply.
In step 402, it is converted the data that acquisition device acquires to by the master chip being connect with acquisition device signal
Digital signal encoding, and it is sent to judging unit.
In step 403, it is determined according to the zeroaxial quantity of digital signal encoding according to digital signal by master chip
Coding carries out the metering method of energy meter, and carries out energy measurement.Metering method includes alternating current metering and direct current metering.
In some embodiments, the zeroaxial quantity of digital signal encoding can be detected with preset frequency, such as in two alternating current frequencies
A zeroaxial quantity is detected in the rate period.If zeroaxial quantity is more than or equal to predetermined quantity threshold value, it is determined that tested power supply is
AC power source carries out energy measurement using exchange metering method；If zeroaxial quantity is less than predetermined quantity threshold value, it is determined that tested
Power supply is DC power supply, carries out energy measurement using DC measurement mode.In some embodiments, predetermined quantity threshold value can be
Positive integer more than or equal to 1.
By such method, can real-time monitoring collection voltages, current data, and be converted into digital signal, passed through
Zero point quantity judges to determine that power supply as direct current or exchange, and then selects corresponding energy measurement mode, so as in the energy
Switch metering method in the case where switching in real time, improves the adaptive degree of energy measurement；It can be applied to direct current or friendship
Under the metering scene of galvanic electricity, the application range of equipment is extended.
In some embodiments, unit can be provided by the signal connecting with master chip signal send first to master chip
The electric signal of level or second electrical level；Master chip sends the electric signal of the first level or second electrical level to switch unit, with control
The on-off of switch unit, wherein switch unit is located at the power supply circuit of tested power supply, controls power supply circuit on-off.In some realities
It applies in example, shape can be on by sending the electric signal control power supply circuit of the first level (such as level 1) to switch unit
State；It is in an off state by sending second electrical level (such as level 0) control power supply circuit to switch unit；Wherein, the first level
Higher than second electrical level.
By such method, the power supply state of tested power supply can be controlled, such as is cut according to the determination of energy measurement result
Disconnected power supply power supply or turn-on power power supply, so that realization improves the availability of metric results according to the feedback control of metric results
With the controllability of circuit.
In some embodiments, the electric energy from tested power supply is received by the first power supply unit, voltage is converted based on
Master chip is supplied to after the operating voltage of chip；The electric energy from tested power supply is received by the second power supply unit, voltage is turned
The operating voltage of switch unit is turned to, and is supplied to switch unit.In some embodiments, the first power supply unit and the second power supply
Unit can be the same unit.By such method, electric energy can be obtained from tested power supply and after conversion to meter
The chip of amount device provides stable power supply, without providing extra work power supply, reduce use the complexity of equipment with
Use condition.
Finally it should be noted that: above embodiments are only to illustrate the technical solution of the disclosure rather than its limitations；To the greatest extent
Pipe is described in detail the disclosure referring to preferred embodiment, it should be understood by those ordinary skilled in the art that: still
It can modify to the specific embodiment of the disclosure or some technical features can be equivalently replaced；Without departing from this public affairs
The spirit of technical solution is opened, should all be covered in the claimed technical proposal scope of the disclosure.
Claims (16)
1. a kind of energy metering device, comprising:
It is connect with tested power supply, acquires the current value of circuit-under-test and the acquisition device of voltage value；With,
The data that the acquisition device acquires are converted number by the master chip connecting with the acquisition device signal, the master chip
Word Signal coding, and the zeroaxial quantity encoded according to the digital signal determines that coding carries out energy according to the digital signal
The metering method of metering, and carry out energy measurement, wherein the metering method includes alternating current metering and direct current metering.
2. the apparatus according to claim 1, further includes:
The voltage of the tested power supply is converted institute by the first power supply unit connecting with the tested power supply and the master chip
The operating voltage of master chip is stated, and is supplied to the master chip.
3. the apparatus according to claim 1, further includes:
It is connect with the master chip signal, the display unit for receiving the energy measurement information from master chip and showing.
4. the apparatus according to claim 1, further includes:
Positioned at the power supply circuit of the tested power supply, the switch unit of the power supply circuit on-off is controlled；
The switch control terminal of the switch unit is connect with the master chip；
The master chip also sends the electric signal of the first level or second electrical level to the switch unit, single to control the switch
The on-off of member.
5. device according to claim 4, further includes:
The signal connecting with the master chip signal provides unit, and Xiang Suoshu master chip sends first level or described second
The electric signal of level；
The electric signal for providing power supply from the signal is sent to the switch control terminal of the switch unit by the master chip.
6. device according to claim 4, further includes:
The second power supply unit connecting with the tested power supply and the switch unit converts the voltage of the tested power supply to
The operating voltage of the switch unit, and it is supplied to the switch unit.
7. device according to claim 4, wherein the switch unit includes:
First N-type metal-oxide semiconductor (MOS) NMOS transistor, the grid of the first NMOS transistor are connected to switch control terminal, the
The drain electrode of one NMOS transistor is connect with the grid of P type metal oxide semiconductor PMOS transistor, the first NMOS transistor
Source electrode connects the first ground；
PMOS transistor, the drain electrode of PMOS transistor are connect with the first supply voltage, the source electrode of PMOS transistor and the 2nd NMOS
The grid of transistor and the grid of third NMOS transistor are separately connected；
The drain electrode of second NMOS transistor, the second NMOS transistor is connect with first input end, the source electrode of the second NMOS transistor
Connect the first ground；
Third NMOS transistor, the drain electrode of third NMOS transistor are connect with the first output end, the source electrode of third NMOS transistor
Connect the first ground, wherein for connecting load branch between first input end and the first output end.
8. device according to claim 7, wherein the switch unit further include:
Isolation signals chip, signal input part are connect with switch control terminal, the grid of signal output end and the first NMOS transistor
Connection, input side ground terminal are connect with the second, and outlet side ground terminal is connect with the first.
9. device according to claim 8, wherein
The voltage input end and voltage output end of the isolation signals chip are all connect with the second supply voltage, second power supply
Filter capacitor is respectively connected between voltage and the input side ground terminal and outlet side ground terminal of the isolation signals chip；Or,
Between the signal input part and voltage input end of the isolation signals chip and signal output end and voltage output end it
Between all access pull-up resistor.
10. device according to claim 8, wherein further include at least one of following:
Pull-up resistor is accessed between the drain electrode and the drain electrode of the PMOS transistor of first NMOS transistor；
The source electrode of the PMOS transistor and the grid of second NMOS transistor and the grid of the third NMOS transistor
The first ground is accessed by pull down resistor after connection；
Filter capacitor is accessed between first supply voltage and first ground；Or
The load branch includes concatenated power supply and load, and the power supply connects the first input end, the load connection
First output end.
11. device according to any one of claim 4 to 10, wherein
When the master chip sends the electric signal of the first level to the switch unit, the power supply circuit of the tested power supply is in
On state；
When the master chip sends the electric signal of second electrical level to the switch unit, the power supply circuit of the tested power supply is in
Off-state；
Wherein, first level is higher than the second electrical level.
12. the apparatus according to claim 1, wherein
The measuring parameter include: voltage, electric current, active power, reactive power, apparent energy, power factor, active energy or
One of reactive energy is a variety of.
13. a kind of energy meter method, comprising:
The current value and voltage value of circuit-under-test are acquired by the acquisition device connecting with tested power supply；
Digital signal is converted by the data that the acquisition device acquires by the master chip connecting with the acquisition device signal
Coding；With
The zeroaxial quantity that the master chip encodes according to the digital signal determines that coding carries out energy according to the digital signal
The metering method of meter amount, and carry out energy measurement, wherein the metering method includes alternating current metering and direct current metering.
14. according to the method for claim 13, further includes:
Unit, which is provided, by the signal that connect with the master chip signal sends first level or described to the master chip
The electric signal of second electrical level；
The master chip sends the electric signal of the first level or second electrical level to the switch unit, with the logical of control switch unit
It is disconnected, wherein the switch unit is located at the power supply circuit of the tested power supply, controls the power supply circuit on-off.
15. further including according to the method for claim 14, at least one of following:
The electric energy from the tested power supply is received by the first power supply unit, converts voltage to the work electricity of the master chip
The master chip is supplied to after pressure；Or
The electric energy from the tested power supply is received by the second power supply unit, converts voltage to the work of the switch unit
Voltage, and it is supplied to the switch unit.
16. according to the method for claim 14, wherein the control power supply circuit on-off includes:
It is in the conductive state that electric signal by sending from the first level to the switch unit controls the power supply circuit；
It is in an off state by sending the second electrical level control power supply circuit to the switch unit；
Wherein, first level is higher than the second electrical level.
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| CN201910915585.2A CN110531154A (en) | 2019-09-26 | 2019-09-26 | Energy metering device and method |
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