CN106093560B - The full decompression of extremely low power dissipation detects control method under ammeter power-down state - Google Patents
The full decompression of extremely low power dissipation detects control method under ammeter power-down state Download PDFInfo
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
- G01R19/16547—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies voltage or current in AC supplies
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Abstract
The invention discloses the full decompressions of extremely low power dissipation under ammeter power-down state to detect control method, is related to ammeter technical field, when the ammeter of this method is operated in battery mode, the full decompression record current that ammeter carries out low-power consumption according to setting electric current detection frequency can be allowed to detect.The master chip being connect including computation chip and with computation chip, when ammeter is operated under battery mode, master chip controls the current detecting frequency of computation chip according to the pre-set time interval detected to load current；Judge 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 computation chip signal, computation 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 computation chip.
Description
Technical field
The present invention relates to ammeter technical fields, and in particular to the full decompression detection control of extremely low power dissipation under ammeter power-down state
Method.
Background technology
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 according to lacking two because of electric quantity compensating
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, the lasting detection of power-down state detection that 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.
When existing ammeter works under the battery mode of power-down state still meter is persistently opened with normal operating conditions method
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 other functions of ammeter detection, while can also influence the service life of battery.
Invention content
The present invention is to provide a kind of ammeter in order to solve existing ammeter there are above-mentioned deficiency and be operated in battery mode
When, the full decompression record current that ammeter carries out low-power consumption according to the current detecting frequency of setting can be allowed to detect, power consumption is low, electricity
Pond service life is long, and the full decompression of extremely low power dissipation detects control method under the high ammeter power-down state of reliability.
The above technical problem is solved by following technical proposal：
Under ammeter power-down state extremely low power dissipation full decompression detect control method, including computation chip and with computation chip connect
The master chip connect, the computation chip include normal mode, part detection pattern, amperometric detection mode and suspend mode, control
Method includes the following steps：
When ammeter is operated under battery mode, master chip is according to the pre-set time interval detected to load current
To control the current detecting frequency of computation chip；Full decompression low-power consumption detection includes full decompression detection and metering under battery mode
Detection；And it decides whether to carry out gauge check according to full decompression testing result only 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 judge 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, computation chip is opened immediately and is switched to the full decompression record of amperometric detection mode progress from suspend mode, otherwise not
Open the amperometric detection mode of computation chip.
When this programme ammeter is operated in battery mode, 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, and reliability is high, 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, also saves the cost caused by replacing battery, has higher
Technology and economic value.
Preferably, when computation chip does not detect, controlled by master chip, so that computation chip is operated in least in power-consuming
Under suspend mode, computation chip is then waken up at set time intervals and is switched to amperometric detection mode under suspend mode
Under；Compared with computation chip is by the three-phase load electric current current threshold good with advance school under amperometric detection mode, if having in threshold value
Above split-phase load current can then trigger the interrupt output end of computation chip and export low level, to decide whether to open
The amperometric detection mode of computation chip carries out full decompression record.
Preferably, computation chip is switched to amperometric detection mode from suspend mode carries out the process of full decompression record such as
Under：Start, computation 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 judge currently without the full decompression of generation state and the last full decompression occurred state whether phase
Together
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
Computation chip is switched to suspend mode；
If the state of the state and the last full decompression occurred currently without the full decompression of generation differs, will meter
Amount chip is switched to normal mode, is recorded 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 computation 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；Then judge current occurent full decompression state and the last full decompression occurred state whether phase
Together
If the state of current occurent full decompression is identical with the state of full decompression that the last time occurs, directly will
Computation 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 differs
Amount chip is switched to normal mode, is recorded 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 computation chip is then switched to suspend mode again；
After computation 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 computation chip next time carries out full decompression record next time.
Preferably, in order to which full decompression is not missed, then two threshold values for presetting threshold are needed, i.e., in threshold value
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 computation chip includes pattern pin PM1 and pattern pin PM0, and controlled normally by master chip
Switching between pattern, part detection pattern, amperometric detection mode and suspend mode.
Preferably, further include 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 more than given threshold, then high level is exported.
Preferably, there are six current threshold comparator is total, this six current threshold comparators are respectively used to three-phase electricity
The detection of forward current and negative current, and this six current threshold comparators are respectively with corresponding current detecting control bit
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.
Preferably, the current detection threshold of current threshold comparator by the threshold register of the current threshold comparator Lai
Setting, if the current detection threshold of current threshold comparator ranging from H1-H2, if the current detection threshold of current threshold comparator
The bottom threshold of range is H1, if the upper threshold of the current detection threshold range of current threshold comparator is H2, if falling in threshold
A value being worth between lower limit H1 and upper threshold H2 is variable H；And together by bottom threshold H1, upper threshold H2 and variable H
It stores in threshold register；
When comparison circuit exports high level, judge whether (H2-H) ÷ (H-H1) is more than 1, if (H2-H) ÷ (H-H1)
It more 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, judge whether (H-H1) ÷ (H2-H) is more than 1, if (H-H1) ÷ (H2-H)
It more 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 values new in threshold register.
The present invention can reach following effect：
When ammeter of the present invention is operated in battery mode, 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, and reliability is high, 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, also saves the cost caused by replacing battery, has higher
Technology and economic value.
Description of the drawings
Fig. 1 is that a kind of normal mode of operation for whether opening computation chip of the present invention carries out full decompression record flow signal
Figure.
Fig. 2 is a kind of calibration flow diagram of current detection threshold of the present invention.
Specific implementation mode
The present invention is further illustrated with embodiment below in conjunction with the accompanying drawings.
Embodiment, the full decompression of extremely low power dissipation detects control method under ammeter power-down state, including computation chip and with meter
The master chip of chip connection is measured, the computation chip includes normal mode, part detection pattern, amperometric detection mode and suspend mode mould
Formula.Control method includes the following steps：
When ammeter is operated under battery mode, master chip is according to the pre-set time interval detected to load current
To control the current detecting frequency of computation chip.
Full decompression low-power consumption detection includes full decompression detection and gauge check under battery mode.And only in full decompression
It decides 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.
Judge 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 computation chip signal, opens computation chip immediately and is switched to current detecting mould from suspend mode
Formula carries out full decompression record, is otherwise not turned on the amperometric detection mode of computation chip.
It when computation chip does not detect, is controlled by master chip, computation chip is made to be operated in suspend mode least in power-consuming
Under, computation chip is then waken up at set time intervals to be switched under amperometric detection mode under suspend mode.In electric current
Compared with computation chip is by the three-phase load electric current current threshold good with advance school under detection pattern, if there is the split-phase more than threshold value
Load current can then trigger the interrupt output end of computation chip and export low level, to decide whether to open computation chip
Amperometric detection mode carries out full decompression record.
Shown in Figure 1, computation chip is switched to the process that amperometric detection mode carries out full decompression record from suspend mode
It is as follows：Start, computation 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 judge currently without the full decompression of generation state and the last full decompression occurred state whether phase
Together
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
Computation chip is switched to suspend mode.
If the state of the state and the last full decompression occurred currently without the full decompression of generation differs, will meter
Amount chip is switched to normal mode, is recorded 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 computation 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.Then judge current occurent full decompression state and the last full decompression occurred state whether phase
Together
If the state of current occurent full decompression is identical with the state of full decompression that the last time occurs, directly will
Computation 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 differs
Amount chip is switched to normal mode, is recorded 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 computation chip is then switched to suspend mode again.
After computation 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 computation chip next time carries out full decompression record next time.
In order to which full decompression is not missed, then two threshold values for presetting threshold, i.e. upper threshold and threshold value are needed
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 computation chip includes pattern pin PM1 and pattern pin PM0, and by master chip control normal mode, part
Switching between detection pattern, amperometric detection mode and suspend mode.The electric current of computation chip need of work is when normal mode
13mA.The electric current of computation chip need of work is 7mA when the detection pattern of part.Computation chip need of work when amperometric detection mode
Electric current be unidirectionally 200uA, it is two-way be 100uA.The electric current of computation 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 more 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 respectively with corresponding current detecting control bit 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.
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 of current threshold comparator ranging from H1-H2, if the current detecting of current threshold comparator
The bottom threshold of threshold range is H1, if the upper threshold of the current detection threshold range of current threshold comparator is H2, if falling
The value limited under the threshold value between H1 and upper threshold H2 is variable H.And by bottom threshold H1, upper threshold H2 and variable H
It stores in threshold register together.
When comparison circuit exports high level, judge whether (H2-H) ÷ (H-H1) is more than 1, if (H2-H) ÷ (H-H1)
It more 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, judge whether (H-H1) ÷ (H2-H) is more than 1, if (H-H1) ÷ (H2-H)
It more than 1, then detects current threshold and is equal to H1, then terminate calibration detection.If (H-H1) ÷ (H2-H) is 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 values new in threshold register.
H1=2mVrms in this example, H2=4mVrms.
Full decompression detection function verification is carried out below
In order to ensure the reliability of invention, need to be verified by actual test.The present embodiment prepares in verification
3 ammeters are verified in all cases.Accurate according to state's network mark, full decompression occurs termination condition and is：
Cumulative time is with 1 minute for minimum time unit.
Occurrence condition is：Maximum phase voltage ＜ critical voltages threshold values (60%Un), and load current ＞ (5%Ib), Δ t
＞ (60s).
Termination condition is：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 detections are primary, consider that reliable detection, the Sample Establishing time of amperometric detection mode are loosened to from 32ms
50ms, and full decompression does not occur, computation 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.
When the present embodiment ammeter is operated in battery mode, ammeter can be allowed to carry out low-power consumption according to the current detecting frequency of setting
The detection of full decompression record current, power consumption is low, and battery is long, and reliability is high, realizes ammeter in battery mode
Low-power consumption detection when full decompression exception realizes under battery mode that full decompression continuously detects that provide can for a long time for ammeter
Energy.The reduction of battery power consumption means the extension of service time of battery, also saves the cost caused by replacing battery, 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. under ammeter power-down state extremely low power dissipation full decompression detect control method, which is characterized in that including computation chip and with
The master chip of computation chip connection, the computation chip includes normal mode, part detection pattern, amperometric detection mode and suspend mode
Pattern, control method include the following steps：
When ammeter is operated under battery mode, master chip is controlled according to the pre-set time interval detected to load current
The current detecting frequency of computation chip processed；
Full decompression low-power consumption detection includes full decompression detection and gauge check under battery mode；And it is only detected in full decompression
It decides 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；
Judge 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 an interrupt signal is triggered to master chip, during master chip receives by current threshold comparator
After break signal, master chip gives computation chip signal, immediately open computation 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 computation chip；
Computation chip from suspend mode be switched to amperometric detection mode carry out full decompression record process it is as follows：Start, Mei Geshe
It fixes time and wakes up computation 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 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 the state and the last full decompression occurred currently without the full decompression of generation differs, by metering core
Piece is switched to normal mode, is recorded 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, computation 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 is 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 differs, by metering core
Piece is switched to normal mode, is recorded 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, computation chip is then switched to suspend mode again；
After computation chip is switched to suspend mode state, beginning state is returned to further according to the time interval of setting, it is so past
The full decompression that the multiple amperometric detection mode for restarting whether to be opened computation chip next time carries out next time records.
2. the full decompression of extremely low power dissipation detects control method under ammeter power-down state according to claim 1, which is characterized in that
It when computation chip does not detect, is controlled by master chip, so that computation chip is operated under suspend mode least in power-consuming, then press
It is switched under amperometric detection mode under suspend mode according to the time interval wake-up computation chip of setting；Under amperometric detection mode
Compared with computation chip is by the three-phase load electric current current threshold good with advance school, if there is the split-phase load current more than threshold value,
The interrupt output end of computation chip can then be triggered and export low level, to decide whether to open the current detecting mould of computation chip
Formula carries out full decompression record.
3. the full decompression of extremely low power dissipation detects control method under ammeter power-down state according to claim 1, which is characterized in that
In order to which full decompression is not missed, then two threshold values for presetting threshold, i.e. upper threshold and bottom threshold are needed；Judge
Full decompression then uses bottom threshold when starting, and judges then to use upper threshold at the end of full decompression.
4. the full decompression of extremely low power dissipation detects control method under ammeter power-down state according to claim 1, which is characterized in that
The computation chip includes pattern pin PM1 and pattern pin PM0, and by master chip control normal mode, part detection pattern,
Switching between amperometric detection mode and suspend mode.
5. the full decompression of extremely low power dissipation detects control method under ammeter power-down state 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
It is realized by comparison circuit, when foreign current is less than the threshold value of setting, comparison circuit exports low level；It is set when foreign current is more than
When determining threshold value, then high level is exported.
6. the full decompression of extremely low power dissipation detects control method under ammeter power-down state according to claim 1, which is characterized in that
There are six current threshold comparator is total, this six current threshold comparators are respectively used to the forward current and negative current of three-phase electricity
Detection, and this six current threshold comparators control respective current threshold with corresponding current detecting control bit respectively
The opening and closing of comparator；The current detection threshold of each current threshold comparator is arranged by respective threshold register.
7. the full decompression of extremely low power dissipation detects control method under ammeter power-down state according to claim 1, which is characterized in that
The current detection threshold of current threshold comparator is arranged by the threshold register of the current threshold comparator,
If the current detection threshold of current threshold comparator ranging from H1-H2, if the current detection threshold of current threshold comparator
The bottom threshold of range is H1, if the upper threshold of the current detection threshold range of current threshold comparator is H2, if falling in threshold
A value being worth between lower limit H1 and upper threshold H2 is variable H；And together by bottom threshold H1, upper threshold H2 and variable H
It stores in threshold register；
When comparison circuit exports high level, judge（H2-H）÷（H-H1）Whether 1 is more than, if（H2-H）÷（H-H1）It is more than
1, then it detects current threshold and is equal to H, then terminate calibration detection；If（H2-H）÷（H-H1）No more than 1, then H1=H is allowed,
And calculate new H=（H2+H1）Then this new variable H value is assigned to threshold register by ÷ 2；
When comparison circuit exports low level, judge（H-H1）÷（H2-H）Whether 1 is more than, if（H-H1）÷（H2-H）It is more than
1, then it detects current threshold and is equal to H1, then terminate calibration detection；If（H-H1）÷（H2-H）No more than 1, then H2=H is allowed,
And calculate new H=（H2+H1）Then this new variable H value is assigned to threshold register by ÷ 2；
Then the low and high level signal of comparison circuit output is controlled by variable H values new in threshold register.
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