CN106124853B - The full decompression of power down ammeter low-power consumption detects power consumption control method - Google Patents
The full decompression of power down ammeter low-power consumption detects power consumption control method Download PDFInfo
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- CN106124853B CN106124853B CN201610473760.3A CN201610473760A CN106124853B CN 106124853 B CN106124853 B CN 106124853B CN 201610473760 A CN201610473760 A CN 201610473760A CN 106124853 B CN106124853 B CN 106124853B
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- G01R22/06—Arrangements for measuring time integral of electric power or current, e.g. electricity meters by electronic methods
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Abstract
The invention discloses the full decompressions of power down ammeter low-power consumption to detect power consumption control method, is related to ammeter technical field, and the ammeter of this method works in battery mode, and ammeter can be allowed to detect according to the full decompression record current that setting electric current detection frequency carries out low-power consumption.Including metering chip and the master chip connecting with metering chip, when ammeter work is under battery mode, master chip controls the current detecting frequency of metering chip according to the pre-set time interval detected to load current；Determine whether ammeter occurs full decompression by the way that whether current threshold comparator detection load electric current reaches the threshold value of threshold；In case of full decompression, an interrupt signal is then triggered to master chip by current threshold comparator, after master chip receives interrupt signal, master chip gives metering chip signal, metering chip is opened immediately and is switched to the full decompression record of amperometric detection mode progress from suspend mode, is otherwise not turned on the amperometric detection mode of metering chip.
Description
Technical field
The present invention relates to ammeter technical fields, and in particular to the full decompression of power down ammeter low-power consumption detects power consumption control method.
Background technique
The full decompression writing function of ammeter is a kind of most common practical event recording function of ammeter, is by losing entirely
The electricity for being recorded as being remedied of pressure event provides accurate electric quantity compensating foundation, avoids causing because of electric quantity compensating according to lacking two
The dispute of power supply and electricity consumption both sides.The full decompression detection of ammeter is divided into normal operating conditions detection and power-down state detection.Wherein,
The power-down state detection of ammeter needs cell powers, and the lasting detection of power-down state detection can consume a large amount of battery electricity
Amount, so as to influence whether ammeter power-down state detection detection time length and battery service life.
Meter is persistently still opened with normal operating conditions method when existing ammeter works under the battery mode of power-down state
It measures chip and sample detecting is carried out to load current, the big volume and electricity of battery can be consumed in this way, energy consumption consumption is fast, can make the electricity of battery
Amount runs out within a short period of time, to influence the other function of ammeter detection, while also will affect the service life of battery.
Summary of the invention
The present invention is to provide a kind of ammeter work in battery mode to solve existing ammeter there are above-mentioned deficiency
When, ammeter can be allowed to detect according to the full decompression record current that the current detecting frequency of setting carries out low-power consumption, power consumption is low, electricity
Pond long service life, the full decompression of the power down ammeter low-power consumption of high reliablity detect power consumption control method.
The above technical problem is solved through the following technical scheme:
The full decompression of power down ammeter low-power consumption detects power consumption control method, including metering chip and the master connecting with metering chip
Chip, the metering chip include normal mode, part detection pattern, amperometric detection mode and suspend mode, the metering core
Piece further includes mode pin PM1 and mode pin PM0, when master chip is simultaneously to the mode pin PM1 and mode pipe of metering chip
Foot PM0 all input high level signal when then metering chip electric source modes be normal mode work as mode of the master chip to metering chip
The power supply mould of then metering chip when to mode pin PM0 exporting low level signal again while pin PM1 input high level signal
Formula is part detection pattern；Again to mode while mode pin PM1 input low level signal of the master chip to metering chip
Then the electric source modes of metering chip are amperometric detection mode when pin PM0 exports high level signal；When master chip is simultaneously to metering
The mode pin PM1 and mode pin PM0 of chip all input low level signal when then metering chip electric source modes be suspend mode mould
Formula；
Control method includes the following steps:
When ammeter work is under battery mode, master chip is according to the pre-set time interval detected to load current
To control the current detecting frequency of metering chip；
Full decompression low-power consumption detection includes the detection of full decompression and gauge check under battery mode, and only in full decompression
It is decided whether to carry out gauge check according to full decompression testing result after detection, if there is the generation of full decompression just carries out metering inspection
It surveys, without gauge check if there is no full decompression；
Determine whether ammeter is sent out by the way that whether current threshold comparator detection load electric current reaches the threshold value of threshold
Raw full decompression:
In case of full decompression, then an interrupt signal is triggered to master chip by current threshold comparator, master chip is received
To after interrupt signal, master chip gives metering chip signal, opens metering chip immediately from suspend mode and is switched to current detecting mould
Formula carries out full decompression record, is otherwise not turned on the amperometric detection mode of metering chip.
Metering chip since suspend mode be switched to amperometric detection mode carry out full decompression record process it is as follows:, often
Metering chip is waken up to amperometric detection mode every setting time, then judges whether load current is more than threshold value；
If load current is not above threshold value, illustrate currently without the full decompression of generation, while reading last generation
Full decompression；Then do you judge whether identical currently without the state of the full decompression of generation and the state of the last full decompression occurred?
If identical with the state of full decompression that the last time occurs currently without the state of the full decompression of generation, directly will
Metering chip is switched to suspend mode；
If the state of state and the last full decompression occurred currently without the full decompression of generation is not identical, will meter
Amount chip is switched to normal mode, records to the state of the full decompression currently without generation, and terminates last generation
The state recording of full decompression, while full decompression Status Flag being updated to full decompression Status Flag does not occur, and simultaneously by threshold value
Threshold register is written in lower limit, and metering chip is then switched to suspend mode again；
If load current alreadys exceed threshold value, illustrate that full decompression currently is occurring, while reading last generation
Full decompression；Whether the state of the state and the last full decompression occurred that then judge current occurent full decompression identical?
If the state of current occurent full decompression is identical with the state of full decompression that the last time occurs, directly will
Metering chip is switched to suspend mode；
It, will meter if the state of the state of current occurent full decompression and the last full decompression occurred is not identical
Amount chip is switched to normal mode, records to the state of current occurent full decompression, and terminates last generation
The state recording of full decompression, while full decompression Status Flag being updated to full decompression Status Flag has occurred, and simultaneously by threshold value
Threshold register is written in the upper limit, and metering chip is then switched to suspend mode again；
After metering chip is switched to suspend mode state, beginning state is returned to further according to the time interval of setting, such as
This amperometric detection mode for back and forth restarting whether to be opened metering chip next time carries out full decompression record next time；
The electric current of metering chip need of work is 13mA when normal mode；Metering chip need of work when the detection pattern of part
Electric current be 7mA；When amperometric detection mode the electric current of metering chip need of work be unidirectionally 200uA, it is two-way be 100uA；Suspend mode
The electric current of metering chip need of work is 1uA when mode.
This programme ammeter works in battery mode, and ammeter can be allowed to carry out low-power consumption according to the current detecting frequency of setting
Full decompression record current detection, power consumption is low, and battery is long, high reliablity, and it is complete in battery mode to realize ammeter
Low-power consumption detection when decompression exception realizes that continuously detection provides possibility to full decompression for a long time for ammeter under battery mode.
The reduction of battery power consumption means the extension of service time of battery, and cost caused by also saving because of replacement battery has higher
Technology and economic value.
Preferably, controlling when metering chip is not detected by master chip, make metering chip work least in power-consuming
Under suspend mode, metering chip is then waken up at set time intervals and is switched to amperometric detection mode under suspend mode
Under；Compared with metering chip is by the three-phase load electric current current threshold good with preparatory school under amperometric detection mode, if having in threshold value
Above split-phase load current can then trigger the interrupt output end of metering chip and export low level, to decide whether to open
The amperometric detection mode of metering chip carries out full decompression record.
Preferably, then needing to preset two threshold values of threshold, i.e., in threshold value in order to which full decompression is not missed
Limit and bottom threshold；Judge then to use bottom threshold when full decompression starts, judges then to use upper threshold at the end of full decompression.
Preferably, the metering chip includes mode pin PM1 and mode pin PM0, and controlled normally by master chip
Switching between mode, part detection pattern, amperometric detection mode and suspend mode.
Preferably, further including the comparison circuit of low-power consumption, and by comparing circuit to the threshold value under amperometric detection mode
It is verified, current detecting is realized by comparison circuit, and when foreign current is less than the threshold value of setting, comparison circuit exports low electricity
It is flat；When foreign current is greater than given threshold, then high level is exported.
Preferably, this six current threshold comparators are respectively used to three-phase electricity there are six current threshold comparator is total
The detection of forward current and negative current, and this six current threshold comparators use corresponding current detecting control bit respectively
To control the opening and closing of respective current threshold comparator；The current detection threshold of each current threshold comparator is by respective
Threshold register is arranged；Further include the comparison circuit of low-power consumption, current threshold comparator include one in the normal mode
Examine the enabled control bit of calibration enabled to carry out current detecting, and when the output of comparison circuit is exported as detection, if
Output is that low level then detects closing, is detected if output is high level enabled；This six current threshold comparators are right respectively
Three negative currents of current channel are answered to detect control bit and three forward current detection control bits, and each forward current is examined
Then corresponding current threshold comparator detection closing when control bit is high level is surveyed, each forward current detection control bit is low electricity
Usually then corresponding current threshold comparator detection is enabled, and each negative current is detected when control bit is high level and then corresponded to
Current threshold comparator detect and close, then corresponding current threshold compares when each negative current detection control bit is low level
Device detection is enabled.
Preferably, the current detection threshold of current threshold comparator by the threshold register of the current threshold comparator Lai
Setting presets the electricity that standard source output needs to detect if the current detection threshold range of current threshold comparator is H1-H2
Signal, and the bottom threshold of the current detection threshold range of current threshold comparator is H1, if the electric current of current threshold comparator
The upper threshold of detection threshold value range is H2, if the value fallen between bottom threshold H1 and upper threshold H2 is variable H；And
Bottom threshold H1, upper threshold H2 and variable H are stored in threshold register together；
When comparison circuit exports high level, whether judgement (H2-H) ÷ (H-H1) is greater than 1, if (H2-H) ÷ (H-H1)
It greater than 1, then detects current threshold and is equal to H, then terminate calibration detection；If (H2-H) ÷ (H-H1) is not more than 1, H1 is allowed
=H, and new H=(H2+H1) ÷ 2 is calculated, this new variable H value is then assigned to threshold register；
When comparison circuit exports low level, whether judgement (H-H1) ÷ (H2-H) is greater than 1, if (H-H1) ÷ (H2-H)
It greater than 1, then detects current threshold and is equal to H1, then terminate calibration detection；If (H-H1) ÷ (H2-H) is not more than 1, allow
H2=H, and new H=(H2+H1) ÷ 2 is calculated, this new variable H value is then assigned to threshold register；
Then the low and high level signal of comparison circuit output is controlled by variable H value new in threshold register.
The present invention can reach following effect:
Ammeter work of the present invention can allow ammeter to carry out low-power consumption according to the current detecting frequency of setting in battery mode
Full decompression record current detection, power consumption is low, and battery is long, high reliablity, and it is complete in battery mode to realize ammeter
Low-power consumption detection when decompression exception realizes that continuously detection provides possibility to full decompression for a long time for ammeter under battery mode.
The reduction of battery power consumption means the extension of service time of battery, and cost caused by also saving because of replacement battery has higher
Technology and economic value.
Detailed description of the invention
Fig. 1 is the full decompression record process signal of normal mode of operation progress whether one kind of the invention opens metering chip
Figure.
Fig. 2 is a kind of calibration flow diagram of current detection threshold of the invention.
Specific embodiment
The present invention will be further described below with reference to the accompanying drawings and embodiments.
Embodiment, the full decompression of power down ammeter low-power consumption detect power consumption control method, including metering chip and and metering chip
The master chip of connection, the metering chip include normal mode, part detection pattern, amperometric detection mode and suspend mode.Institute
Stating metering chip further includes mode pin PM1 and mode pin PM0, when master chip is simultaneously to the mode pin PM1 of metering chip
With mode pin PM0 all input high level signal when then metering chip electric source modes be normal mode when master chip is to metering core
Then metering chip when to mode pin PM0 exporting low level signal again while the mode pin PM1 input high level signal of piece
Electric source modes be part detection pattern when mode pin PM1 input low level signal from master chip to metering chip while again
To mode pin PM0 export high level signal when then metering chip electric source modes be amperometric detection mode when master chip simultaneously to
The mode pin PM1 and mode pin PM0 of metering chip all input low level signal when then metering chip electric source modes be stop
Sleep mode.
Control method includes the following steps:
When ammeter work is under battery mode, master chip is according to the pre-set time interval detected to load current
To control the current detecting frequency of metering chip.Full decompression low-power consumption detection includes that full decompression is detected and measured under battery mode
Detection, and only decided whether to carry out gauge check according to full decompression testing result after the detection of full decompression, if there is
Full decompression occurs just to carry out gauge check, without gauge check if not having full decompression.Compared by current threshold
Whether device detection load electric current reaches the threshold value of threshold to determine whether ammeter occurs full decompression.In case of full mistake
Pressure then triggers an interrupt signal to master chip by current threshold comparator, and after master chip receives interrupt signal, master chip is to meter
Chip signal is measured, metering chip is opened immediately from suspend mode and is switched to the full decompression record of amperometric detection mode progress, otherwise not
Open the amperometric detection mode of metering chip.
It when metering chip does not detect, is controlled by master chip, makes metering chip work in suspend mode least in power-consuming
Under, metering chip is then waken up at set time intervals to be switched under amperometric detection mode under suspend mode.In electric current
Compared with metering chip is by the three-phase load electric current current threshold good with preparatory school under detection pattern, if there is the split-phase more than threshold value
Load current can then trigger the interrupt output end of metering chip and export low level, to decide whether to open metering chip
Amperometric detection mode carries out full decompression record.
Shown in Figure 1, metering chip is switched to the process that amperometric detection mode carries out full decompression record from suspend mode
It is as follows: to start, wake up metering chip to amperometric detection mode every setting time, then judge whether load current is more than threshold
Value.
If load current is not above threshold value, illustrate currently without the full decompression of generation, while reading last generation
Full decompression.Then do you judge whether identical currently without the state of the full decompression of generation and the state of the last full decompression occurred?
If identical with the state of full decompression that the last time occurs currently without the state of the full decompression of generation, directly will
Metering chip is switched to suspend mode.
If the state of state and the last full decompression occurred currently without the full decompression of generation is not identical, will meter
Amount chip is switched to normal mode, records to the state of the full decompression currently without generation, and terminates last generation
The state recording of full decompression, while full decompression Status Flag being updated to full decompression Status Flag does not occur, and simultaneously by threshold value
Threshold register is written in lower limit, and metering chip is then switched to suspend mode again.
If load current alreadys exceed threshold value, illustrate that full decompression currently is occurring, while reading last generation
Full decompression.Whether the state of the state and the last full decompression occurred that then judge current occurent full decompression identical?
If the state of current occurent full decompression is identical with the state of full decompression that the last time occurs, directly will
Metering chip is switched to suspend mode.
It, will meter if the state of the state of current occurent full decompression and the last full decompression occurred is not identical
Amount chip is switched to normal mode, records to the state of current occurent full decompression, and terminates last generation
The state recording of full decompression, while full decompression Status Flag being updated to full decompression Status Flag has occurred, and simultaneously by threshold value
Threshold register is written in the upper limit, and metering chip is then switched to suspend mode again.
After metering chip is switched to suspend mode state, beginning state is returned to further according to the time interval of setting, such as
This amperometric detection mode for back and forth restarting whether to be opened metering chip next time carries out full decompression record next time.
In order to which full decompression is not missed, then need to preset two threshold values of threshold, i.e. upper threshold and threshold value
Lower limit.Judge then to use bottom threshold when full decompression starts, judges then to use upper threshold at the end of full decompression.
The metering chip includes mode pin PM1 and mode pin PM0, and controls normal mode, part by master chip
Switching between detection pattern, amperometric detection mode and suspend mode.The electric current of metering chip need of work is when normal mode
13mA.The electric current of metering chip need of work is 7mA when the detection pattern of part.Metering chip need of work when amperometric detection mode
Electric current be unidirectionally 200uA, it is two-way be 100uA.The electric current of metering chip need of work is 1uA when suspend mode.
Further include the comparison circuit of low-power consumption, and the threshold value under amperometric detection mode verified by comparing circuit,
Current detecting is realized that, when foreign current is less than the threshold value of setting, comparison circuit exports low level by comparison circuit.Work as external electrical
When stream is greater than given threshold, then high level is exported.
Current threshold comparator altogether there are six, this six current threshold comparators be respectively used to three-phase electricity forward current and
The detection of negative current, and this six current threshold comparators are controlled with corresponding current detecting control bit respectively respectively
The opening and closing of current threshold comparator.The current detection threshold of each current threshold comparator is by respective threshold register
To be arranged.It further include the comparison circuit of low-power consumption, current threshold comparator includes that an inspection calibration in the normal mode makes
It is enabled to carry out current detecting to can control position, and when the output of comparison circuit is as detection output, if output is low electricity
It is flat then detect closing, it is detected if output is high level enabled.This six current threshold comparators respectively correspond current channel
Three negative currents detection control bit and three forward currents detect control bits, and each forward current detection control bit is
Then corresponding current threshold comparator detection is closed when high level, and each forward current detection control bit then corresponds to when being low level
The detection of current threshold comparator it is enabled, and each negative current detection control bit then corresponding current threshold when being high level
Comparator detection is closed, and then corresponding current threshold comparator detection makes when each negative current detection control bit is low level
Energy.
Shown in Figure 2, the current detection threshold of current threshold comparator is deposited by the threshold value of the current threshold comparator
Device is arranged, if the current detection threshold range of current threshold comparator is H1-H2, presets standard source output and needs to detect
Electric signal, and set current threshold comparator current detection threshold range bottom threshold as H1, if current threshold comparator
The upper threshold of current detection threshold range be H2, if falling in a value between bottom threshold H1 and upper threshold H2 is change
Measure H.And bottom threshold H1, upper threshold H2 and variable H are stored in threshold register together.
When comparison circuit exports high level, whether judgement (H2-H) ÷ (H-H1) is greater than 1, if (H2-H) ÷ (H-H1)
It greater than 1, then detects current threshold and is equal to H, if then terminating calibration detection (H2-H) ÷ (H-H1) no more than 1, allow H1
=H, and new H=(H2+H1) ÷ 2 is calculated, this new variable H value is then assigned to threshold register
When comparison circuit exports low level, whether judgement (H-H1) ÷ (H2-H) is greater than 1, if (H-H1) ÷ (H2-H)
It greater than 1, then detects current threshold and is equal to H1, if then terminating calibration detection (H-H1) ÷ (H2-H) no more than 1, allow H2
=H, and new H=(H2+H1) ÷ 2 is calculated, this new variable H value is then assigned to threshold register
Then the low and high level signal of comparison circuit output is controlled by variable H value new in threshold register.
Metering chip need of work when the electric current of metering chip need of work is the part 13mA detection pattern when normal mode
Electric current when being 7mA amperometric detection mode the electric current of metering chip need of work be unidirectionally 200uA, it is two-way be 100uA suspend mode mould
The electric current of metering chip need of work is 1uA when formula.
H1=2mVrms in this example, H2=4mVrms.
Full decompression detection function verifying is carried out below
In order to guarantee the reliability of invention, need to be verified by actual test.The present embodiment prepares in verifying
3 ammeters are verified in all cases.Quasi- according to state's network mark, termination condition occurs for full decompression are as follows:
Cumulative time is with 1 minute for minimum time unit.
Occurrence condition are as follows: maximum phase voltage < critical voltage threshold values (60%Un), and load current > (5%Ib), Δ t
> (60s).
Termination condition are as follows: maximum phase voltage >=critical voltage threshold values (60%Un) or load current≤(5%Ib), Δ t
> (60s).
According to termination condition occurs, test result is as shown in table 1:
Table 1: full decompression test data
Power consumption calculation and comparison are carried out below
According to table 1 describe, below we respectively to the power consumption of two kinds of full decompression detection methods do substantially calculate and comparison.
Assuming that 50s detection is primary, reliable detection is considered, the sample settling time of amperometric detection mode is loosened to from 32ms
50ms, and full decompression does not occur, metering chip average power consumption electric current is as follows.
Common detection methods-:
(50 (s) * 1 (uA)+0.05 (s) * 13000 (uA))/50.05 (s)=13.986 (uA)
Reducing power consumption detection method two:
(50 (s) * 1 (uA)+0.05 (s) * 200 (uA))/50.05 (s)=1.1988 (uA)
As it can be seen that almost there was only original 8.57% using two power consumption of method, lower power consumption is clearly.
The present embodiment ammeter works in battery mode, and ammeter can be allowed to carry out low-power consumption according to the current detecting frequency of setting
Full decompression record current detection, power consumption is low, and battery is long, high reliablity, realizes ammeter in battery mode
Low-power consumption detection when full decompression exception realizes that full decompression continuously detects that provide can for a long time for ammeter under battery mode
Energy.The reduction of battery power consumption means the extension of service time of battery, also save because replacement battery caused by cost, have compared with
High technology and economic value.
Embodiments of the present invention are described above in conjunction with attached drawing, however, the implementation is not limited to the above embodiments, this field
Those of ordinary skill can be with various changes and modifications may be made within the scope of the appended claims.
Claims (7)
1. the full decompression of power down ammeter low-power consumption detects power consumption control method, which is characterized in that including metering chip and and metering core
The master chip of piece connection, the metering chip includes normal mode, part detection pattern, amperometric detection mode and suspend mode,
The metering chip further includes mode pin PM1 and mode pin PMO, when master chip is simultaneously to the mode pin of metering chip
PM1 and mode pin PMO all input high level signal when then metering chip electric source modes be normal mode；When master chip is to meter
It is then measured while measuring the mode pin PM1 input high level signal of chip and when exporting low level signal to mode pin PMO
The electric source modes of chip are part detection pattern；When master chip is to the mode pin PM1 input low level signal of metering chip
Then the electric source modes of metering chip are amperometric detection mode when simultaneously and exporting high level signal to mode pin PMO；Work as main core
Piece simultaneously to the mode pin PM1 and mode pin PMO of metering chip all input low level signal when then metering chip power supply
Mode is suspend mode；
Control method includes the following steps:
When ammeter work is under battery mode, master chip is controlled according to the pre-set time interval detected to load current
The current detecting frequency of metering chip processed；
Full decompression low-power consumption detection includes the detection of full decompression and gauge check under battery mode, and is only detected in full decompression
It is decided whether to carry out gauge check according to full decompression testing result afterwards, if there is full decompression occurs just to carry out gauge check,
Without gauge check if there is no full decompression；
Determine whether ammeter occurs entirely by the way that whether current threshold comparator detection load electric current reaches the threshold value of threshold
Decompression；
In case of full decompression, then interrupt signal is triggered to master chip by current threshold comparator, during master chip receives
After break signal, master chip gives metering chip signal, immediately open metering chip from suspend mode be switched to amperometric detection mode into
The full decompression record of row, is otherwise not turned on the amperometric detection mode of metering chip；
Metering chip since suspend mode be switched to amperometric detection mode carry out full decompression record process it is as follows:, Mei Geshe
It fixes time and wakes up metering chip to amperometric detection mode, then judge whether load current is more than threshold value；
If load current is not above threshold value, illustrate currently without the full decompression of generation, while reading the complete of last generation
Decompression；Then do you judge whether identical currently without the state of the full decompression of generation and the state of the last full decompression occurred?
It, directly will metering if identical with the state of full decompression that the last time occurs currently without the state of the full decompression of generation
Chip is switched to suspend mode；
If the state of state and the last full decompression occurred currently without the full decompression of generation is not identical, by metering core
Piece is switched to normal mode, records to the state of the full decompression currently without generation, and terminates the full mistake of last generation
The state recording of pressure, while full decompression Status Flag being updated to full decompression Status Flag does not occur, and simultaneously by bottom threshold
Threshold register is written, metering chip is then switched to suspend mode again；
If load current alreadys exceed threshold value, illustrate that full decompression currently is occurring, while reading the complete of last generation
Decompression；Whether the state of the state and the last full decompression occurred that then judge current occurent full decompression identical?
It, directly will metering if the state of current occurent full decompression is identical with the state of full decompression that the last time occurs
Chip is switched to suspend mode；
If the state of the state of current occurent full decompression and the last full decompression occurred is not identical, by metering core
Piece is switched to normal mode, records to the state of current occurent full decompression, and terminates the full mistake of last generation
The state recording of pressure, while full decompression Status Flag being updated to full decompression Status Flag has occurred, and simultaneously by upper threshold
Threshold register is written, metering chip is then switched to suspend mode again；
After metering chip is switched to suspend mode state, beginning state is returned to further according to the time interval of setting, it is so past
Restart whether to be opened the full decompression that the amperometric detection mode of metering chip carries out next time next time again to record；
The electric current of metering chip need of work is 13mA when normal mode；The electricity of metering chip need of work when the detection pattern of part
Stream is 7mA；When amperometric detection mode the electric current of metering chip need of work be unidirectionally 200uA, it is two-way be 100uA；Suspend mode
When metering chip need of work electric current be 1uA.
2. the full decompression of power down ammeter low-power consumption detects power consumption control method according to claim 1, which is characterized in that measuring
It when chip does not detect, is controlled by master chip, makes metering chip work under suspend mode least in power-consuming, then according to setting
Time interval wake up metering chip be switched under amperometric detection mode under suspend mode；The metering core under amperometric detection mode
Compared with piece is by the three-phase load electric current current threshold good with preparatory school, if there is the split-phase load current more than threshold value, it can touch
It sends out the interrupt output end of metering chip and exports low level, to decide whether that the amperometric detection mode for opening metering chip carries out
Full decompression record.
3. the full decompression of power down ammeter low-power consumption detects power consumption control method according to claim 1, which is characterized in that in order to complete
Decompression is not missed, then needs to preset two threshold values of threshold, i.e. upper threshold and bottom threshold；Judge full decompression
Bottom threshold is then used when beginning, judges then to use upper threshold at the end of full decompression.
4. the full decompression of power down ammeter low-power consumption detects power consumption control method according to claim 1, which is characterized in that the meter
Amount chip includes mode pin PM1 and mode pin PM0, and is examined by master chip control normal mode, part detection pattern, electric current
Switching between survey mode and suspend mode.
5. the full decompression of power down ammeter low-power consumption detects power consumption control method according to claim 1, which is characterized in that further include
The comparison circuit of low-power consumption, and the threshold value under amperometric detection mode is verified by comparing circuit, current detecting is by comparing
Circuit realizes that, when foreign current is less than the threshold value of setting, comparison circuit exports low level；When foreign current is greater than given threshold
When, then export high level.
6. the full decompression of power down ammeter low-power consumption detects power consumption control method according to claim 1, which is characterized in that current threshold
There are six value comparator is total, this six current threshold comparators are respectively used to the forward current of three-phase electricity and the inspection of negative current
It surveys, and this six current threshold comparators are compared respectively with corresponding current detecting control bit to control respective current threshold
The opening and closing of device；The current detection threshold of each current threshold comparator is arranged by respective threshold register；
It further include the comparison circuit of low-power consumption, current threshold comparator includes an enabled control of inspection calibration in the normal mode
Position processed is enabled to carry out current detecting, and when the output of comparison circuit is as detection output, if output is low level
Detection is closed, and is detected if output is high level enabled；
This six current threshold comparators respectively correspond the three negative currents detection control bit and three positive electricity of current channel
Stream detection control bit, and then close when being high level by the detection of corresponding current threshold comparator for each forward current detection control bit
It closes, then corresponding current threshold comparator detection is enabled when each forward current detection control bit is low level, and each bears
Then the detection of corresponding current threshold comparator is closed when to current detecting control bit being high level, each negative current detection control
Then corresponding current threshold comparator detection is enabled when position is low level.
7. the full decompression of power down ammeter low-power consumption detects power consumption control method according to claim 1, which is characterized in that current threshold
The current detection threshold of value comparator is arranged by the threshold register of the current threshold comparator, if current threshold comparator
Current detection threshold range is H1-H2, presets the electric signal that standard source output needs to detect, and set current threshold comparator
Current detection threshold range bottom threshold be H1, if the upper threshold of the current detection threshold range of current threshold comparator
For H2, if the value fallen between bottom threshold H1 and upper threshold H2 is variable H；And by bottom threshold H1, upper threshold
H2 and variable H are stored in threshold register together；
When comparison circuit exports high level, whether judgement (H2-H) ÷ (H-H1) is greater than 1, if (H2-H) ÷ (H-H1) is greater than
1, then it detects current threshold and is equal to H, then terminate calibration detection；If (H2-H) ÷ (H-H1) is not more than 1, H1=H is allowed,
And new H=(H2+H1) ÷ 2 is calculated, this new variable H value is then assigned to threshold register；
When comparison circuit exports low level, whether judgement (H-H1) ÷ (H2-H) is greater than 1, if (H-H1) ÷ (H2-H) is greater than
1, then it detects current threshold and is equal to H1, then terminate calibration detection；If (H-H1) ÷ (H2-H) is not more than 1, H2=is allowed
H, and new H=(H2+H1) ÷ 2 is calculated, this new variable H value is then assigned to threshold register；
Then the low and high level signal of comparison circuit output is controlled by variable H value new in threshold register.
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