CN111638399B - Electric energy meter metering method without PT - Google Patents
Electric energy meter metering method without PT Download PDFInfo
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- CN111638399B CN111638399B CN202010534246.2A CN202010534246A CN111638399B CN 111638399 B CN111638399 B CN 111638399B CN 202010534246 A CN202010534246 A CN 202010534246A CN 111638399 B CN111638399 B CN 111638399B
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- 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
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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
- G01R22/061—Details of electronic electricity meters
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Abstract
A method for metering an electric energy meter without PT (potential transformer) is suitable for metering the electric quantity of the electric energy meter without a PT element in a zero line dropping state, a main chip controls the electric energy meter to switch a dormant state or a working state according to a certain period, different wake-up periods are set in a grading manner according to the detected load current, namely different wake-up periods are set in a grading manner on the current value, when the load current is relatively large, the wake-up time is shortened, and the frequency of current sampling and electric quantity metering is increased, so that the precision of the electric quantity metering is improved; when the load current is relatively small, the awakening time is increased, the frequency of current sampling and electric quantity metering is reduced, the power consumption of the electric energy meter is reduced, the service life of a power supply battery is prolonged, the electric energy meter can realize electric quantity metering, the accuracy of electric quantity metering and the power consumption of the electric energy meter can be considered, and the effects of environmental friendliness, energy conservation and environmental protection are achieved.
Description
Technical Field
The invention relates to the technical field of electric energy metering, in particular to a metering method of an electric energy meter without PT.
Background
At present, a power circuit of an electric energy meter generally comprises a PT (current mode voltage transformer) for converting current input by a power supply end into voltage to supply power to the electric energy meter, so that the electric energy meter can normally work under the action of impressed current, and the electric quantity is measured. Although, can provide stable mains voltage for the electric energy meter through voltage transformer, also can normally work under the condition of guaranteeing the electric energy meter to steal the electricity or fall the zero line state, however, the design that increases the voltage transformer component has increased the cost of electric energy meter, and the volume of conventional current type voltage transformer component is great, can produce the area occupied of more circuit board, and the inside usage space of electric energy meter, be unfavorable for arranging of other components and parts, be unfavorable for simplification and the miniaturization development of electric energy meter.
The electric energy meter without PT is not powered by an external power supply in the zero line falling state, the electric energy meter is often powered by a power supply battery, and when the electric energy meter performs electric quantity metering in real time, the power consumption of the power supply battery can be greatly increased, so that the service time of the battery is reduced, and certain metering accuracy is often lost when the electric quantity metering is performed at a fixed frequency. Therefore, how to realize the electric energy meter without PT to perform low-power consumption and high-accuracy electric quantity metering in the state of zero line loss becomes a technical problem to be solved at present.
Disclosure of Invention
In view of the defects that the cost of the existing electric energy meter with PT is high, the space occupancy rate of a PT element in the electric energy meter is high and the like, the invention aims to provide a method for metering an electric energy meter without PT, so that the electric energy meter without the PT element can realize the function of electric quantity metering in the power-down state of a zero line, and meanwhile, the cost of the electric energy meter can be reduced, and the internal space of the electric energy meter can be saved.
In order to achieve the above and other related objects, the present invention provides a method for measuring electric quantity of an electric energy meter without PT, which is suitable for measuring electric quantity of an electric energy meter without PT element in a zero-line-out state, wherein the electric energy meter comprises a main chip, a measuring chip, a sampling circuit, a battery power supply circuit and a power supply battery, the method comprises: after the electric energy meter enters a power-down state, the main chip sets preset time for timing by the timer as default time and controls the electric energy meter to enter a first dormancy state; meanwhile, the main chip starts a timer to start timing; when the timing time of the timer reaches the preset time, the main chip wakes up the electric energy meter, controls a sampling circuit to collect load current, detects whether the load current value is greater than a first current threshold value, if so, executes an electric quantity metering process in a metering period to obtain the electric quantity of the load in a period, and after the execution is finished, repeatedly executes the step; if not, the main chip sets the preset time as a first time and controls the electric energy meter to re-enter a first dormant state; meanwhile, starting a timer to start timing, and repeatedly executing the step; the executing the electric quantity metering process in one metering cycle to obtain the load electric consumption in one metering cycle includes: the main chip configures the preset time corresponding to the load current value according to the load current value; the main chip enables the metering chip to generate an electric quantity metering signal according to the load current value, so that the main chip obtains the load power consumption in one period according to the electric quantity metering signal and stores the load power consumption; the main chip controls the electric energy meter to enter a second dormant state; and simultaneously, the master chip starts the timer to start timing.
In an embodiment of the present invention, the configuring, by the master chip, the preset time according to the load current value includes: the main chip detects the magnitude of the load current, and when the load current is detected to be larger than the first current threshold and smaller than the second current threshold, the preset time is set as second time; and when the load current is detected to be larger than the second current threshold, setting the preset time as a third time.
In an embodiment of the present invention, the default time is 10s.
In an embodiment of the invention, the first current threshold is 100mA, and the first time is 1min.
In an embodiment of the invention, the second current threshold is 5A, and the second time is 30s; the third time is 10s.
In an embodiment of the present invention, the enabling of the main chip to enable the metering chip to generate an electric quantity metering signal according to the load current value, so that the main chip obtains the load electric consumption in a metering cycle according to the electric quantity metering signal, includes: the metering chip continuously sends a pulse signal corresponding to the load current value to the register for storage and accumulation according to the load current value detected by the sampling circuit until the metering chip sends a new pulse signal to the register for storage and accumulation according to the load current value newly detected by the sampling circuit in the next metering period; and when the metering chip in the current metering period starts to send the pulse signal, the main chip acquires the pulse total number of the last metering period, acquires the load power consumption corresponding to the last period according to the pulse total number of the last metering period and a constant threshold value, and stores the load power consumption corresponding to the last period into the register.
In an embodiment of the present invention, when the metering chip in the current metering cycle starts to send the pulse signal, the acquiring, by the master chip, the total number of pulses in the previous metering cycle includes: and when the metering chip in the current metering period starts to send the pulse signal, the main chip reads and stores the accumulated pulse accumulated number in the register, and subtracts the accumulated pulse accumulated number in the register read and stored by the main chip in the last metering period from the current pulse accumulated number to obtain the total number of pulses in the last metering period.
In an embodiment of the present invention, the main chip enables the metering chip to generate an electric quantity metering signal according to the load current value, so that the main chip obtains the load power consumption in a metering cycle according to the electric quantity metering signal, further including: and the metering chip sends the load current value to the main chip, and the main chip obtains the load power consumption corresponding to the current metering period according to the load current value, the rated voltage value and the preset time corresponding to the load current value and stores the load power consumption in the register.
In an embodiment of the invention, the power consumption of the electric energy meter in the second sleep state is higher than the power consumption of the electric energy meter in the first sleep state.
In an embodiment of the present invention, the main chip and the metering chip in the electric energy meter are replaced by an integrated chip.
As described above, the metering method of the electric energy meter without PT according to the present invention has the following advantageous effects: the electric energy meter is controlled by the main chip to switch the dormant state or the working state according to a certain period, different wake-up periods are set in a grading manner according to the detected load current, when the load current is relatively large, the wake-up time is shortened, and the frequency of current sampling and electric quantity metering is increased so as to improve the precision of the electric quantity metering; when the load current is relatively small, the awakening time is increased, the frequency of current sampling and electric quantity metering is reduced, the power consumption of the electric energy meter is reduced, the service life of a power supply battery is prolonged, the electric energy meter can realize electric quantity metering, the accuracy of electric quantity metering and the power consumption of the electric energy meter can be considered, and the effects of environmental friendliness, energy conservation and environmental protection are achieved.
Drawings
FIG. 1 is a flow chart illustrating a method for metering an electric energy meter without PT according to an embodiment of the present invention
Description of the element reference numerals
S101 to S102
Detailed Description
The following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than being drawn according to the number, shape and size of the components in actual implementation, and the type, amount and proportion of each component in actual implementation can be changed freely, and the layout of the components can be more complicated.
The electric energy meter metering method without PT is suitable for electric quantity metering of an electric energy meter without a PT element in a zero line dropping state. The electric energy meter comprises a main chip, a metering chip, a sampling circuit, a battery power circuit and a power supply battery, wherein the main chip is a Microprocessor (MCU) chip, and the main chip internally comprises a timer and a register.
Preferentially, the MCU chip and the metering chip in the electric energy meter can be replaced by an integrated chip integrating the functions of the MCU chip and the metering chip; in a specific implementation, the integrated Chip includes an SoC (System on a Chip).
Under the zero line falling state, because the electric energy meter does not contain a PT element, the electric energy meter cannot obtain voltage induced current as a power supply, and the power supply battery supplies power to the electric energy meter through the battery power supply circuit so as to realize electric quantity measurement in the zero line falling state.
Referring to fig. 1, the method for metering an electric energy meter without PT includes:
s101, when the main chip detects that the electric energy meter enters a zero line falling state, the main chip sets preset time for timing of the timer as default time, and controls the electric energy meter to enter a first sleep state; meanwhile, the master chip starts the timer to start timing.
Specifically, when the main chip detects that the electric energy meter enters a zero line falling state for the first time, namely when the electric energy meter is detected to be switched from an external power supply state to an external power supply-free state, the main chip sets preset time for timing by the timer as default time, and controls the electric energy meter to enter a first dormant state; in the first dormancy state, the main chip closes the operation of other elements except the timer, and the electric energy meter is in a low power consumption state; and simultaneously, the master chip starts the timer to start timing.
Further, when the main chip detects that the electric energy meter enters a zero line falling state, the default time is set to be 10s; namely, the first wake-up period of the electric energy meter after entering the zero line-off state is set to 10s, so that the load current can be read more accurately after the current is stabilized.
S102, when the timing time of the timer reaches a preset time, the main chip wakes up the electric energy meter, controls a sampling circuit to collect load current, detects whether the load current value is larger than a first current threshold value, if so, executes an electric quantity metering process in a metering period to obtain the electric consumption of the load electric quantity in a period, and after the execution is finished, repeatedly executes the step S102; if not, the main chip sets the preset time as a first time and controls the electric energy meter to re-enter a first dormant state; meanwhile, a timer is started to start timing, and step S102 is repeatedly performed.
Specifically, when the timing time of the timer reaches a preset time, the timer sends an interrupt signal to the main chip, so that the main chip can control the electric energy meter to enter a working state. Namely, when the preset time is the default time and the timing time of the timer reaches the default time, the timer sends an interrupt signal to the main chip to enable the main chip to control the electric energy meter to enter the working state.
In the working state, the main chip enables all elements in the electric energy meter to be in a runnable state, and the electric energy meter is in a higher power consumption state. The main chip starting circuit detection channel controls the sampling circuit to collect load current and sends the load current value to the main chip; the main chip detects whether the load current is greater than the first preset value or not, and the method comprises the following steps:
(1) When the load current is detected to be smaller than the first current threshold, the main chip configures preset time as first time and controls the electric energy meter to re-enter a first dormant state; and meanwhile, starting a timer to start timing, returning to the step S102, and repeatedly executing the step S102 until the electric energy meter exits the zero line falling state.
Further, the first current threshold is 100mA; the first preset time is 1min.
(2) When it is detected that the load current is greater than the first current threshold, performing an electricity metering process in a metering period to obtain a power consumption amount of the load electricity in a period, and after the electricity metering process in the metering period is completed, repeating S102, including: the main chip configures the preset time corresponding to the load current value according to the load current value; the main chip enables the metering chip to generate an electric quantity metering signal according to the load current value, so that the main chip obtains the load electric consumption in one period according to the electric quantity metering signal and stores the load electric consumption; the main chip controls the electric energy meter to enter a second dormant state; and simultaneously, the master chip starts the timer to start timing.
The main chip configures the preset time corresponding to the load current value according to the load current value; and the main chip enables the metering chip to generate an electric quantity metering signal according to the load current value, so that the main chip acquires the load electric consumption in one period according to the electric quantity metering signal, and the method comprises the following steps:
(a) The main chip configures the preset time corresponding to the load current value according to the value of the load current;
specifically, the main chip configures the preset time for implementing the timing of the timer according to the load current value acquired by the sampling circuit, that is, the timing parameter of the timer is set to a value corresponding to the preset time.
It should be noted that the preset time corresponds to the value of the load current and is inversely related to the value of the load current, that is, when the detected load current is larger, the corresponding preset time is smaller.
Further, the configuring, by the main chip, the preset time corresponding to the load current value according to the value of the load current includes: the main chip detects the value of the load current, and when the load current is detected to be smaller than the second current threshold value, the preset time is configured to be second time; and when the load current is detected to be larger than the second current threshold, setting the preset time as a third time.
In a specific embodiment, the second current threshold is 5A, the second time is 30s, and the third predetermined time is 10s; when the load current is detected to be less than 5A, configuring the preset time as a second time 30s; and when the load current is detected to be larger than 5A, setting the preset time to be 10s.
It should be noted that, in the present invention, the main chip configures a specific configuration policy for implementing the preset time timed by the timer according to the load current value collected by the sampling circuit, which is not limited to the configuration policy manner shown in this implementation, and can be flexibly adjusted according to the requirements of users.
Different preset times are set for the current value in a grading way, namely, the different preset times are set for the current value in a grading way, so that when the load current is relatively large, the sleep time is shortened, and the frequency of current sampling and electric quantity metering is increased, so that the precision of the electric quantity metering is improved; when the load current is relatively small, the sleep time is prolonged, the frequency of current sampling and electric quantity metering is reduced, the power consumption of the electric energy meter is reduced, the service life of a power supply battery is prolonged, the electric energy meter can realize electric quantity metering and can also take into account the accuracy of electric quantity metering and the power consumption of the electric energy meter, and the electric energy meter has the effects of being green, energy-saving and environment-friendly.
(b) And when the main chip configures the preset time corresponding to the load current value according to the load current value, the main chip enables the metering chip to generate an electric quantity metering signal according to the load current value, so that the main chip obtains the load power consumption in one period according to the electric quantity metering signal and stores the load power consumption.
Specifically, the implementation manner that the main chip enables the metering chip to generate an electric quantity metering signal according to the load current value, so that the main chip obtains the load power consumption according to the electric quantity metering signal includes: the main chip sends a control signal to the metering chip, so that the metering chip generates a pulse signal according to the load current value detected by the sampling circuit, and continuously sends the pulse signal to the register for storage and accumulation until the electric energy meter enters the next metering period, and the metering chip sends a new pulse signal to the register for storage and accumulation according to the load current value detected again by the sampling circuit; and when the metering chip of the current metering period starts to send the pulse signal, the main chip acquires the total number of pulses of the last metering period and acquires the load power consumption corresponding to the last period according to the total number of pulses of the last metering period and a constant threshold.
Furthermore, the electric energy meter also comprises a pulse signal indicator light, the metering chip generates a pulse signal according to the load current value detected by the sampling circuit, and continuously sends the pulse signal, and meanwhile, the main chip controls the signal indicator light to correspondingly flash according to the sending frequency of the pulse signal, so that a user can conveniently obtain the load power consumption condition and check the electric quantity metering error.
In this embodiment, in the one metering cycle, when the main chip detects that the load current value is greater than the first current threshold, the electric quantity metering process in one metering cycle starts to be executed, and when the main chip detects that the load current value is greater than the first current threshold next time, the electric quantity metering process in another metering cycle starts to be executed.
Furthermore, when the metering chip starts to send the pulse signal in the current metering period, the main chip obtains the total number of pulses in the previous metering period, including: and in the current metering period, when the metering chip starts to send the pulse signal, the main chip reads and stores the accumulated pulse accumulated number in the register, subtracts the accumulated pulse accumulated number in the register read and stored by the main chip in the last metering period from the current pulse accumulated number to obtain a pulse accumulated number difference value, and takes the pulse accumulated number difference value as the total number of pulses in the last metering period.
Further, the implementation manner that the main chip enables the metering chip to generate an electric quantity metering signal according to the load current value, so that the main chip obtains the power consumption of the load according to the electric quantity metering signal further includes: the metering chip sends the load current value to the main chip, and the main chip obtains load power consumption corresponding to the current metering period according to the load current value, the rated voltage value of the electric energy meter and the preset time corresponding to the load current value, and stores the load power consumption in the register.
(c) After the main chip obtains the power consumption of the load, the main chip controls the electric energy meter to enter a second dormancy state; meanwhile, the main chip starts the timer to start timing, returns to the step S102, and repeatedly executes the step S102 until the electric energy meter exits the zero line-off state.
Specifically, after the main chip finishes the electric quantity metering, the main chip controls the MCU to enter a second sleep state; the power consumption of the electric energy meter in the second dormant state is higher than that of the electric energy meter in the first dormant state. In the second dormancy state, the main chip closes the operation of other elements except the timer, the metering chip and the register, and the electric energy meter is in a low power consumption state; and simultaneously, the main chip starts the timer to start timing until the timing time reaches the new preset time, and the timer generates overflow interruption.
In order to further illustrate the beneficial effects of the electric energy meter metering method without PT, the method and other electric energy meter metering methods are respectively adopted to carry out comparison tests of multi-group electric quantity metering and power consumption measurement.
The other electric energy meter electric quantity measuring methods are common methods for waking up the electric energy meter for electric quantity measurement in a fixed wake-up period, wherein the comparison method 1 is to use the fixed wake-up period of 10 seconds, and the comparison method 2 is to use the fixed wake-up period of 2 minutes for comparison test; and the rated voltage adopted in the comparative test is 220v.
Comparative test I
Removing the external power supply voltage at the time of 9; at 9; at time 9.
The actual load power consumption of the user is:
220*20*(32*60+15)/3600/1000+220*5*3/60/1000+220*1*(360+10)/3600/1000≈2.443kWh
the error between the load power consumption obtained by adopting the method of the invention and the actual load power consumption is as follows:
220*20*(32*60+20)/3600/1000+220*5*3/60/1000+220*1*6/60/1000≈2.448kWh
error I0 = (2.44811-2.44261)/2.27761 ≈ 0.225%
The error between the load power consumption obtained by the comparison method 1 and the actual load power consumption is as follows:
220*20*(32*60+20)/3600/1000+220*5*3/60/1000+220*1*6/60/1000≈2.448kWh
error I1 = (2.44811-2.44261)/2.27761 ≈ 0.225%
The error between the load power consumption obtained by the comparison method 2 and the actual load power consumption is as follows:
220*20*32/60/1000+220*5*2/60/1000+220*1*6/60/1000≈2.405kWh
error I2 = (2.40533-2.44261)/2.27761 ≈ 1.526%
Comparative experiment II
The user removes the external power supply voltage at the time of 14; at 15; at the time of 21.
The actual electricity consumption of the user is:
220*18*(33*60+10)/3600/1000+220*0.05*(6*60+27)/60/1000+220*6*(27*60+18)/3600/1000≈2.861kWh
the error between the load power consumption obtained by adopting the method of the invention and the actual load power consumption is as follows:
220*18*33/60/1000+220*0.05*(6*60+27)/60/1000+220*6*(27*60+20)/3600/1000≈2.851kWh
error II 0= (2.85128-2.86055)/2.86055 ≈ 0.324%
The error between the load power consumption obtained by the comparison method 1 and the actual load power consumption is as follows:
220*18*33/60/1000+220*0.05*(6*60+27)/60/1000+220*6*(27*60+20)/3600/1000≈2.851kWh
error II 1= (2.85128-2.86055)/2.86055 ≈ 0.324%
The error between the load power consumption obtained by the comparison method 2 and the actual load power consumption is as follows:
220*18*32/60/1000+220*0.05*(6*60+28)/60/1000+220*6*26/60/1000≈2.755kWh
error II 2= (2.75513-2.86055)/2.86055 ≈ 3.685%
Comparative experiment III
The user removes the external power supply voltage at the time of 7; at 10; at the time of 17.
The actual electricity consumption of the user is:
220*9*(2*3600+11*60+54)/3600/1000+220*0.06*(7*60+18)/60/1000+220*12*(5*3600+36*60+26)/3600/1000≈19.252kWh
the error between the load power consumption obtained by adopting the method of the invention and the actual load power consumption is as follows:
220*9*(2*3600+11*60+50)/3600/1000+220*0.06*(7*60+18)/60/1000+220*12*(5*3600+36*60+20)/3600/1000≈19.250kWh
error III 0= (19.2499-19.252)/19.252 ≈ 0.011%
The error between the load power consumption obtained by the comparison method 1 and the actual load power consumption is as follows:
220*9*(2*3600+11*60+50)/3600/1000+220*0.06*(7*60+18)/60/1000+220*12*(5*3600+36*60+20)/3600/1000≈19.249kWh
error III 1= (19.2499-19.252)/19.252 ≈ 0.011%
The error between the load power consumption obtained by the comparison method 2 and the actual load power consumption is as follows:
220*9*(2*60+10)/60/1000+220*0.06*(7*60+18)/60/1000+220*12*(5*60+38)/60/1000≈19.258kW h
The load power consumption obtained by each of the measurement methods used in the comparative test, the error between the obtained load power consumption and the actual load power consumption, and the power consumption of the power supply battery consumed when each of the measurement methods performs power measurement are summarized in the following table:
it should be noted that the power consumption of the electric energy meter in the wake-up state is higher than that in the sleep state. In the above comparative experiment, the power consumption of the power supply battery consumed by each metering method during the metering of the electric quantity is positively correlated with the number of times of awakening in the specific metering process. Therefore, for convenience of statistics, the power consumption of the power supply battery consumed by each metering method during electric quantity metering is compared by adopting the wake-up times.
As can be seen from the above table, the error of the metering method used in comparison method 1 and the present invention is minimal; compared with the comparison method 1, the metering method adopted by the invention saves power consumption.
In summary, in the electric energy meter metering method without PT of the present invention, the main chip controls the electric energy meter to switch the sleep state or the working state according to a certain period, and different wake-up periods are set in stages according to the detected load current, that is, different wake-up periods are set in stages for the current value, when the load current is relatively large, the wake-up time is shortened, and the frequency of current sampling and electric quantity metering is increased, so as to improve the precision of electric quantity metering; when the load current is relatively small, the awakening time is increased, the frequency of current sampling and electric quantity metering is reduced, the power consumption of the electric energy meter is reduced, and the service life of a power supply battery is prolonged, so that the electric energy meter can realize electric quantity metering, can give consideration to the accuracy of electric quantity metering and the power consumption of the electric energy meter, and has the effects of environmental protection, energy conservation and environmental protection; meanwhile, under the condition that the electric energy meter is not powered by PT, the metering in the zero line falling state can be realized through the power supply battery, so that the cost of the electric energy meter and the use space inside the electric energy meter are saved.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. A method for metering electric energy meter without PT, which is suitable for metering electric quantity of the electric energy meter without a PT element in a zero line dropping state, wherein the electric energy meter comprises a main chip, a metering chip, a sampling circuit, a battery power supply circuit and a power supply battery, and the method comprises the following steps:
after the electric energy meter enters a power-down state, the main chip sets a timer for timing preset time as default time and controls the electric energy meter to enter a first dormancy state; meanwhile, the main chip starts a timer to start timing;
when the timing time of the timer reaches the preset time, the main chip wakes up the electric energy meter, controls a sampling circuit to collect load current, detects whether the load current value is greater than a first current threshold value, if so, executes an electric quantity metering process in a metering period to obtain the electric quantity of the load in a period, and after the execution is finished, repeatedly executes the step; if not, the main chip sets the preset time as a first time and controls the electric energy meter to enter a first dormant state again; meanwhile, starting a timer to start timing, and repeatedly executing the step;
the executing the electric quantity metering process in one metering cycle to obtain the load electric consumption in one metering cycle includes:
the main chip configures the preset time corresponding to the load current value according to the load current value; the preset time corresponds to a value of the load current and is negatively correlated with the load current value; the main chip enables the metering chip to generate an electric quantity metering signal according to the load current value, so that the main chip obtains the load electric consumption in one period according to the electric quantity metering signal and stores the load electric consumption; the main chip controls the electric energy meter to enter a second dormant state; meanwhile, the master chip starts the timer to start timing.
2. The method for metering the electric energy meter without the PT of claim 1, wherein the main chip configures the preset time according to the load current value, comprising: the main chip detects the magnitude of the load current, and when the load current is detected to be larger than the first current threshold and smaller than a second current threshold, the preset time is set as a second time; and when the load current is detected to be larger than the second current threshold, setting the preset time as a third time.
3. The method of claim 2, wherein the default time is 10s.
4. The method of claim 2, wherein the first current threshold is 100mA and the first time is 1min.
5. The method according to claim 2, wherein the second current threshold is 5A and the second time is 30s; the third time is 10s.
6. The method according to any one of claims 1 to 4, wherein the main chip enables the metering chip to generate a charge metering signal according to the load current value, so that the main chip obtains the load power consumption in one metering period according to the charge metering signal, and the method comprises the following steps: the metering chip continuously sends a pulse signal corresponding to the load current value to a register for storage and accumulation according to the load current value detected by the sampling circuit until the metering chip sends a new pulse signal to the register for storage and accumulation according to the load current value newly detected by the sampling circuit in the next metering period; and when the metering chip in the current metering period starts to send the pulse signal, the main chip acquires the total number of pulses in the last metering period, acquires the load power consumption corresponding to the last period according to the total number of pulses in the last metering period and a constant threshold value, and stores the load power consumption corresponding to the last period into the register.
7. The method of claim 6, wherein the master chip obtains the total number of pulses of the last metering cycle while the metering chip of the current metering cycle starts sending the pulse signal, comprising: and when the metering chip in the current metering period starts to send the pulse signal, the main chip reads and stores the accumulated pulse accumulated number in the register, and subtracts the accumulated pulse accumulated number in the register read and stored by the main chip in the last metering period from the current pulse accumulated number to obtain the total number of pulses in the last metering period.
8. The method according to any one of claims 1 to 4, wherein the main chip enables the metering chip to generate a coulometric signal according to the load current value, so that the main chip obtains the load power consumption in one metering cycle according to the coulometric signal, further comprising: and the metering chip sends the load current value to the main chip, and the main chip obtains the load power consumption corresponding to the current metering period according to the load current value, the rated voltage value and the preset time corresponding to the load current value and stores the load power consumption in a register.
9. The method of claim 1, wherein the power consumption of the meter in the second sleep state is higher than the power consumption of the meter in the first sleep state.
10. The method according to claim 1, wherein the main chip and the metering chip in the electric energy meter are replaced by an integrated chip.
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