CN205539176U - Battery voltage supervisory circuits of full difference ADC mode - Google Patents
Battery voltage supervisory circuits of full difference ADC mode Download PDFInfo
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- CN205539176U CN205539176U CN201620323293.1U CN201620323293U CN205539176U CN 205539176 U CN205539176 U CN 205539176U CN 201620323293 U CN201620323293 U CN 201620323293U CN 205539176 U CN205539176 U CN 205539176U
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Abstract
The utility model provides a battery voltage supervisory circuits of full difference ADC mode includes sampling circuit, comparator, digital process and control module, digital to analogue conversion module, sampling circuit still includes battery select switch and electric charge sharing circuit, sampling circuit is used for gathering the voltage of group battery and carries out the electric charge distribution, the voltage that the group battery was gathered to the switch is passed through to battery select switch module, the electric charge sharing circuit connects the comparator, the output connection digital process and the control module of comparator, digital process and control module connection control digital to analogue conversion module, the electric charge sharing circuit is connected to the digital to analogue conversion module, and digital process and control module adjust the electric charge distribution among the sampling circuit through control digital to analogue conversion module. The utility model has the advantages that: high -voltage switch is small in quantity, and is with low costs, full symmetrical structure eliminates common mode interference, can infinitely expand based on production technology battery passageway number.
Description
Technical field
This utility model relates to the field of power management in electronic circuit, is specifically related to a kind of fully differential ADC mode
Cell voltage supervisory circuit.
Background technology
Set of cells, is series connection and the parallel connection of battery.Set of cells in parallel requires that each cell voltage is identical, output
Voltage is equal to the voltage of a battery, and batteries in parallel connection group is provided that higher electric current. and series battery can provide relatively
High voltage.Quite varied in our life of set of cells, TV remote controller, electronic toy, in pocket lamp
There is series battery.Battery management system (BMS) mainly aims at the utilization rate that can improve battery,
Prevent battery from overcharge and overdischarge occurring, extend the service life of battery, the state of monitoring battery.
In electric vehicle, electrokinetic cell and management system thereof are the most important as main power source
A ring, the quality of battery management system directly determines the service life of set of cells, a suitable cell tube
Reason system can give, while giving full play to battery superior function, the protection that battery is optimal.Battery manager
Can monitor the state of set of cells as can detect the maximum voltage of set of cells (or cell), minimum voltage,
The information such as charging and discharging currents and electric leakage signal also feeds back to the controllers such as vehicle-mounted ECU, thus realizes set of cells
Management.In many systems, in order to meet the needs of power, supplying cell group typically by tens to joints up to a hundred
Single cell battery is composed in series.The management system of whole set of cells there are many managing chips, every managing chip bear
Duty controls the battery of some.
There is a lot of shortcoming in prior art: when detecting fireballing, and the number of active lanes of battery cell monitoring chip is less,
Such as AD7280 chip；When number of active lanes is many, detection speed is relatively slow, such as LTC6803 chip, LTC6804
Chip；Prior art all concentrates on the speed improving high voltage sampling switches simultaneously, ignores the limit of overall architecture speed
Make, and the number of prior art high voltage sampling switches is the twice of cell channel number, because high pressure sampling is opened
Closing the area needed very big, cause whole chip area very big, cost is high.
Utility model content
For solving the problems referred to above, the utility model proposes the cell voltage monitoring electricity of a kind of fully differential ADC mode
Road.
The technical solution of the utility model is:
The cell voltage supervisory circuit of a kind of fully differential ADC mode, at sample circuit, comparator, numeral
Reason and control module, D/A switch module；Sample circuit also includes battery selector switch and charge distribution circuit；
Sample circuit is for gathering the voltage of set of cells and carrying out charge distributing；Battery selector switch module is adopted by switch
The voltage of set battery group；Charge distribution circuit connects comparator；The voltage gathered carry out after charge distributing through than
Relatively device compares, and the output of comparator connects digital processing and control module, and digital processing is connected control with control module
D/A switch module processed, D/A switch module connects charge distribution circuit, and digital processing is passed through with control module
Control the charge distributing in D/A switch module regulation sample circuit.
Preferably, charge distribution circuit module comprises two the same modules of structure: charge distribution circuit one side of something P
With charge distribution circuit one side of something N；Each charge distribution circuit one side of something module ports having Shin, COMP, MSB
And LSB；Battery selector switch has the second output terminals A INP and the first output terminals A INN；Battery selector switch
Port SHin and the electric charge of charge distribution circuit one side of something P it is connected respectively to by output terminals A INP and AINN
The port SHin of distributor circuit one side of something N；AINN and AINP is connected by switch S2；Charge distribution circuit
The output COMP of half of P meets the normal phase input end of comparator, the output COMP of charge distribution circuit one side of something N
Connect the inverting input of comparator；D/A switch module includes the module that two structures are the same: D/A switch P
With D/A switch N；Each D/A switch module ports having VMSB, VLSB；Charge distribution circuit is half of
Port MSB, LSB of P meets port VMSB, VLSB of D/A switch P；Charge distribution circuit one side of something N
Port MSB, LSB meet port VMSB, VLSB of D/A switch P；The output of comparator connects number
Word processing and control module；Digital processing and control module control D/A switch P and D/A switch N respectively.
It is further preferred that each D/A switch also ports having VREF, VTEMP and VREFGND；Numeral
Process be connected respectively with control module port VREF, VTEMP, VREFGND sum of D/A switch P/
Port VREF, VTEMP, VREFGND of mould conversion N.
Said structure is upper and lower full symmetrical configuration, can effectively eliminate common mode disturbances.
Preferably, battery selector switch module includes n+1 switch, and n is the even number more than 1；Open for n+1
Close one end connect the both positive and negative polarity of series-connected cell in set of cells the most respectively；N is that the other end of the switch of odd number connects
It is connected together as the first output terminals A INN；N is 0 or the other end of the switch of even number is connected together as
Second output terminals A INP.
It is further preferred that n+1 switch is high-voltage switch gear.
The benefit of above-mentioned steps is that the number of high-voltage switch gear quantity is few, saves circuit area, low cost.
Preferably, an input of charge distribution circuit one side of something P or charge distribution circuit one side of something N is SHin；Three
Individual it is output as MSB, LSB, COMP；First output terminals A INN of battery selector switch module and second defeated
Go out to hold AINP to connect input and the input of charge distribution circuit one side of something P of charge distribution circuit one side of something N respectively, with
Time the first output terminals A INN and the second output terminals A INP by switch S2 connect；Charge distribution circuit is half of
3 of N and charge distribution circuit one side of something P output be respectively NMSB, NLSB, VINN and PMSB,
PLSB、VINP。
It is further preferred that in charge distribution circuit one side of something P or charge distribution circuit one side of something N, input SHin
Connect electric capacity CS1 and one end of electric capacity CS2；The other end of electric capacity CS1 is connected to level by switch S2
VDDL, simultaneously one end of another termination switch S8 of electric capacity CS1；The other end of electric capacity CS2 is by switch
S4 is connected to level VDDL, simultaneously one end of another termination switch S9 of electric capacity CS2；Switch S8's is another
One end and switch S9 the other end link together connect output COMP export simultaneously COMP by switch S5
It is connected to level VCML, output COMP connecting valve S10 and one end of switch S11；Switch S10's
The other end that the other end is connected to level VDDL Simultaneous Switching S10 by switch S6 connects output MSB；Open
The other end that the other end closing S11 is connected to level VDDL Simultaneous Switching S11 by switch S7 connects output
LSB。
Preferably, D/A switch P or D/A switch N includes the capacitor array module that two structures are identical,
Two capacitor array module are respectively as high-order capacitor array module and bit capacitor array module；High-order electric capacity battle array
The port SB of row module meets VMSB, bit capacitor array module port SB and meets VLSB；High-order electric capacity battle array
Three inputs of row module and bit capacitor array module connect VREF, VTEMP, VREFGND respectively.
It is further preferred that capacitor array module is formed according to the electric capacity of binary weighting arrangement by m, all
One pole plate of electric capacity links together and meets port SB, and the other end of electric capacity is switched by switch and can select respectively
Select and be connected to REF, TEMP or REFGND end；M is the positive integer more than or equal to 1.
This utility model has the advantage that
High-voltage switch gear quantity is that cell channel number adds 1, and whole circuit area is the least, low cost；Battery electricity
Pressure sampling and conversion rate are faster；Full symmetrical configuration, eliminates common mode disturbances；Based on production technology cell channel
Number can be with infinite expanding.
Accompanying drawing explanation
The general frame of the cell voltage supervisory circuit of Fig. 1 this utility model fully differential ADC mode.
The concrete block diagram of the cell voltage supervisory circuit of Fig. 2 this utility model fully differential ADC mode.
The battery selector switch module of the cell voltage supervisory circuit of Fig. 3 this utility model fully differential ADC mode is shown
It is intended to.
The circuit charge distribution circuit mould of the cell voltage supervisory circuit of Fig. 4 this utility model fully differential ADC mode
Block schematic diagram.
Charge distribution circuit one side of something mould of the cell voltage supervisory circuit of Fig. 5 this utility model fully differential ADC mode
Block structural diagram.
The D/A switch circuit module of the cell voltage supervisory circuit of Fig. 6 this utility model fully differential ADC mode
Schematic diagram.
The D/A switch circuit module of the cell voltage supervisory circuit of Fig. 7 this utility model fully differential ADC mode
Middle capacitor array module schematic diagram.
16 passages of cell voltage supervisory circuit specific embodiment of Fig. 8 this utility model fully differential ADC mode
Schematic diagram.
The cell voltage supervisory circuit specific embodiment of Fig. 9 this utility model fully differential ADC mode controls battery
Select the waveform diagram of switch module.
The cell voltage supervisory circuit specific embodiment voltaic couple mould of Figure 10 this utility model fully differential ADC mode
Formula accesses schematic diagram.
The cell voltage supervisory circuit strange mould of specific embodiment battery of Figure 11 this utility model fully differential ADC mode
Formula accesses schematic diagram.
The cell voltage supervisory circuit specific embodiment battery sampling of Figure 12 this utility model fully differential ADC mode
Process schematic.
The cell voltage supervisory circuit specific embodiment charge distributing of Figure 13 this utility model fully differential ADC mode
Process schematic.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, this utility model is made the most in detail, intactly illustrated.
As shown in the cell voltage supervisory circuit the general frame of Fig. 1 this utility model fully differential ADC mode.Fig. 1
The middle left side is set of cells, and right-hand component (in addition to set of cells) is this utility model.This utility model is mainly
It is used for detecting the voltage of monitoring set of cells.The cell voltage supervisory circuit of this utility model fully differential ADC mode
Including sample circuit, comparator, digital processing and control module, D/A switch module；Sample circuit is used for adopting
The voltage of set battery group and carry out charge distributing；Sample circuit also includes battery selector switch and charge distributing electricity
Road；Sample circuit is for gathering the voltage of set of cells；Gather voltage after comparator compares, comparator
Exporting to digital processing and control module, digital processing and control module are adopted by controlling the regulation of D/A switch module
Charge distributing in sample circuit, electric charge redistributes rear comparator and compares, by charge distributing repeatedly,
Relatively, the magnitude of voltage of set of cells is finally given.Above-mentioned detection process of the present utility model can be understood as gradually forcing
The work process of nearly register type (SAR) analog-digital converter (ADC).
Fig. 2 is the concrete block diagram of the cell voltage supervisory circuit of this utility model fully differential ADC mode.Need
Bright is that in Fig. 2, the left side does not illustrate set of cells.As shown in Figure 2, the battery selector switch in sample circuit
The cell voltage selecting set of cells different is connected to charge distribution circuit；Charge distribution circuit module comprises two
The module that structure is the same, charge distribution circuit one side of something P and charge distribution circuit one side of something N；Battery selector switch leads to
Cross output terminals A INP and AINN is connected to port SHin and the charge distributing electricity of charge distribution circuit one side of something P
The port SHin of road one side of something N；AINN and AINP is connected by switch S2 simultaneously；Charge distribution circuit half
The output COMP of limit P meets the normal phase input end of comparator, the output COMP of charge distribution circuit one side of something N
Connect the inverting input of comparator；D/A switch module includes the module that two structures are the same: D/A switch P
With D/A switch N；Port MSB, LSB of charge distribution circuit one side of something P connects the port of D/A switch P
VMSB、VLSB；Port MSB, LSB of charge distribution circuit one side of something N connects the port of D/A switch P
VMSB、VLSB；The output of comparator connects digital processing and control module；Digital processing divides with control module
Kong Zhi D/A switch P and D/A switch N.That is: digital processing and control module meets D/A switch P respectively
Port VREF, VTEMP, VREFGND and the port VREF of D/A switch N, VTEMP,
VREFGND.Structure in Fig. 2 can be understood as fully differential ADC.The benefit of above-mentioned full symmetrical configuration is,
Can effectively eliminate common mode disturbances, improve the reliability of voltage monitoring.Digital processing and control module are also to respectively
Switch in individual module is controlled, and does not illustrate in Fig. 2.
Below modules is described in detail.
Battery selector switch module is for carrying out selecting collection to the voltage of set of cells.Battery selector switch module is led to
Cross and different switch OFF states are arranged gating certain series-connected cell of set of cells as output.As Fig. 3 battery selects
Select shown in switch module.Set of cells is n battery series connection (VCELL1, VCELL2 ... VCELLn),
Corresponding battery selector switch module includes n+1 switch (SW0, SW1 ... SWn, n are more than 1
Even number).N+1 switch one end connect the both positive and negative polarity of series-connected cell in set of cells the most respectively.Need strong
Adjusting, because the voltage of series battery may be the highest, n+1 switch the most here is high-voltage switch gear.
N+1 switch in battery selector switch module, n is that the other end of the switch of odd number is connected together as
One outfan (is defined herein as reversed-phase output AINN)；N is 0 or the other end of the switch of even number is connected to
Together as the second outfan (being defined herein as forward phase output terminal AINP).General, according in set of cells
The difference of the number of series-connected cell, is referred to as the structure of the different passages of monitoring battery.Such as there are 16 battery strings
Connection, referred to as 16 passages.This utility model is n-channel, selects according to practical situation.
Battery selector switch in sample circuit passes through charge distribution circuit after selecting the cell voltage that set of cells is different
Module carries out charge distributing.Cell voltage supervisory circuit such as Fig. 4 this utility model fully differential ADC mode
Shown in charge distribution circuit module diagram.Charge distribution circuit module comprises two the same modules of structure (electricity
Lotus distributor circuit one side of something module), an input of charge distribution circuit one side of something module is SHin；Three are output as
MSB、LSB、COMP.Here charge distribution circuit one side of something P and charge distribution circuit one side of something N it is respectively.
Two output the first output terminals A INN of battery selector switch module and the second output terminals A INP connect electric charge respectively
The input of distributor circuit one side of something N and the input of charge distribution circuit one side of something P, simultaneously the first output terminals A INN and
Second output terminals A INP is connected by switch S2；Charge distribution circuit one side of something N and charge distribution circuit are half of
3 outputs of P are respectively NMSB, NLSB, VINN and PMSB, PLSB, VINP.
Charge distribution circuit such as the cell voltage supervisory circuit of Fig. 5 this utility model fully differential ADC mode is half of
Function structure chart.Fig. 5 is charge distribution circuit one side of something module physical circuit figure.Charge distributing electricity as shown in Figure 5
The input SHin of road one side of something module connects electric capacity CS1 and one end of electric capacity CS2；The other end of electric capacity CS1 passes through
Switch S2 is connected to level VDDL, simultaneously one end of another termination switch S8 of electric capacity CS1；Electric capacity CS2
The other end be connected to level VDDL by switch S4, another termination switch S9 of electric capacity CS2 simultaneously
One end；Switch S8 the other end and switch S9 the other end link together connect output COMP export simultaneously
COMP is connected to level VCML, output COMP connecting valve S10 and switch S11 by switch S5
One end.The other end of switch S10 is connected to another of level VDDL Simultaneous Switching S10 by switch S6
End connects output MSB.The other end of switch S11 is connected to level VDDL Simultaneous Switching by switch S7
The other end of S11 connects output LSB.
The effect of D/A switch circuit module be digital processing with control module by the output result of comparator is entered
Row is analyzed, and controls D/A switch circuit module thus regulates the charge distributing in sample circuit.
D/A switch circuit mould such as the cell voltage supervisory circuit of Fig. 6 this utility model fully differential ADC mode
Shown in block schematic diagram, D/A switch circuit module includes the capacitor array module that two structures are identical, two electric capacity
Array module uses respectively as high-order capacitor array module and bit capacitor array module.High-order capacitor array mould
The port SB of block meets VMSB, bit capacitor array module port SB and meets VLSB.High-order capacitor array mould
Three inputs of block and bit capacitor array module connect VREF, VTEMP, VREFGND respectively.
D/A switch circuit mould such as the cell voltage supervisory circuit of Fig. 8 this utility model fully differential ADC mode
In block shown in capacitor array module schematic diagram, capacitor array module mainly by m according to binary weighting arrangement
Electric capacity forms, and a pole plate of all electric capacity links together and meets port SB, and the other end of electric capacity is by switch
Switching can be alternatively coupled to REF, TEMP or REFGND end respectively.Here, m is more than or equal to 1
Positive integer
Aforementioned comparator, digital processing are general module with control module, are the most just not described in detail.
Preferred embodiment:
For more detailed elaboration operation principle of the present utility model and work process, below by concrete reality
Execute example of the present utility model to introduce.Here select 16 battery series connection, illustrate as a example by i.e. 16 passages.
Work process of the present utility model is following steps:
Step 1: gather the voltage of set of cells by arranging the different conditions of battery selector switch in sample circuit；
Step 2: in sample circuit, electric charge is allocated by charge distribution circuit；
Step 3: the voltage after charge distributing is compared by comparator, comparator exports to digital processing and control mould
Block；
Step 4: digital processing and control module are by controlling the electric charge in D/A switch module regulation sample circuit
Distribution, electric charge is redistributed rear comparator and is compared, by charge distributing repeatedly, compares, final
Magnitude of voltage to set of cells.
Cell voltage supervisory circuit specific embodiment 16 such as Fig. 8 this utility model fully differential ADC mode leads to
Road schematic diagram.16 batteries series connection (VCELL1 VCELL16) in Fig. 8, simultaneously at the electricity of sample circuit
Pond selects there are corresponding 17 switches (SW0 SW16) in switch module.Here fully differential ADC
The cell voltage supervisory circuit of pattern can detect the voltage of 16 series-connected cells simultaneously, selects to open according to battery
Close the different conditions of module breaker in middle, determine the voltage selecting to detect certain battery.
Cell voltage supervisory circuit specific embodiment such as Fig. 9 this utility model fully differential ADC mode controls electricity
Pond selects the waveform diagram of switch module.For the different choice access state of battery, battery selector switch mould
Switch (SW0 SW16) in block be two be one group the most in check.Such as first cycle is SW16
With SW15 Guan Bi (that is: SW16 and SW15 turns on, and VCELL16 accesses), second period SW15
With SW14 Guan Bi (that is: SW15 and SW14 turn on, VCELL15 access) ... successively until SW1
(VCELL1 access) is closed with SW0.
Cell voltage supervisory circuit according to the odd, even different fully differential ADC mode accessing battery is operated in not
Same pattern, the strangest pattern or even modes.Battery such as Figure 10 this utility model fully differential ADC mode
Voltage monitoring circuit specific embodiment voltaic couple pattern accesses schematic diagram and Figure 11 this utility model fully differential
The cell voltage supervisory circuit strange pattern of specific embodiment battery of ADC mode accesses schematic diagram.It is respectively respectively
For even modes (VCELL16 access) and strange pattern (VCELL15 access).The difference of parity modes is
The voltage of AINP with AINN is different.The voltage of the AINP voltage more than AINN during even modes；Strange pattern
Time in contrast.Here mode is also referred to as leap-frogging working method.Waveform in earlier figures 9 combines battery choosing
Select switch module and can be understood as leap-frogging MUX.
It can thus be appreciated that by arranging the different conditions collection set of cells of battery selector switch in sample circuit in step 1
Voltage particularly as follows: switch in battery selector switch module is two is one group and closes conducting successively.It is jumping
Breast-stroke multi-path choice mode.
Below specifically by even modes VCELL16 access detection as a example by carry out sampling and comparison procedure enter one
Step explanation and introduction.
Cell voltage supervisory circuit specific embodiment battery such as Figure 12 this utility model fully differential ADC mode
Shown in sampling process schematic diagram, now battery selector switch module breaker in middle SW16, SW151 Guan Bi；Electric charge
Distributor circuit module breaker in middle S3, S4, S5, S6 and S7 close, and in addition other switch is all in beating
Open state.At this moment the electric charge of battery be stored within charge distribution circuit one side of something N electric capacity CS1 and CS2 and
In electric capacity CS1 and CS2 of charge distribution circuit one side of something P, the positive input of comparator and anti-phase input all connect
Voltage VCML；In the D/A switch starting stage, the high-order capacitor array of D/A switch P and D/A switch N
The initial value that module is different with bit capacitor storage with the high-order electric capacity in bit capacitor array module.Now
The electric charge of VINP point and VINN point is respectively as follows:
QP1=VDDL(CS+CMSBP)+VSSL(CS2+CLSBP)-AINP(2CS)-VREF(CMSBPF+CLSBPF)
-VREFGND(CMSBP+CLSBP-CMSBPF-CLSBPF)
QN1=VDDL(CS+CMSBN)+VSSL(CS2+CLSBN)-AINN(2CS)-VREF(CMSBNF+CLSBNF)
-VREFGND(CMSBN+CLSBN-CMSBNF-CLSBNF)
Here:
It is high-order in D/A switch P and the total capacitance of low level for VINP point CMSBP and CLSBP,
CMSBPF and CLSBPF is attached to the electric capacity of VREF.
It is high-order in D/A switch N and the total capacitance of low level for VINN point CMSBN and CLSBN,
CMSBNF and CLSBNF is attached to the electric capacity of VREF.
Electric capacity CS1 and CS2 is as sampling capacitance, and assumes CS1=CS2=CS.
After battery sampling process, carry out charge distributing (or referred to as conversion process).As this practicality of Figure 13 is new
Shown in the cell voltage supervisory circuit specific embodiment charge distributing process schematic of type fully differential ADC mode.
Now charge distribution circuit module breaker in middle S2, S8, S9, S10 and S11 Guan Bi, in addition other is opened
Close all in open mode.Electric charge is redistributed at D/A switch circuit module.
Now the electric charge of VINP point and VINN point is respectively as follows:
Here:
VINP point CMSBPF ' and CLSBPF ' is attached to the switching capacity of VREF；For VINN
Point CMSBNF ' and CLSBNF ' is attached to the switching capacity of VREF.
According to charge distributing rule, and assume QP2=QP1, QN2=QN1.Now VINP point and VINN
The voltage of point is respectively as follows:
Assume if:
CMSBP=CMSBN=CMSB；
CLSBP=CLSBN=CLSB；
CMSBPF=CMSB-CMSBNF；
CLSBPF=CLSB-CLSBNF,
CMSBPF '=CMSB-CMSBNF '；
CLSBPF '=CLSB-CLSBNF '.
Then, can obtain:
I.e. be can get VINP point and the difference of VINN point by said process, afterwards by comparator relatively after
Record storage is carried out through digital processing and control module compared result.The most again in logarithm/analog conversion circuit module
High/low position capacitor array is adjusted, and re-starts charge distributing, until VINP point and the difference of VINN point
Less than certain value, thus digital processing and control module obtain the magnitude of voltage of final set of cells.
Compared with prior art, the utility model has the advantages that: high-voltage switch gear quantity is that cell channel number adds 1
Individual, whole circuit area is the least, low cost；Battery voltage sampling and conversion rate are faster；Full symmetrical configuration,
Eliminate common mode disturbances；Can be with infinite expanding based on production technology cell channel number.
Claims (8)
1. the cell voltage supervisory circuit of a fully differential ADC mode, it is characterised in that: include sample circuit, comparator, digital processing and control module, D/A switch module；Sample circuit also includes battery selector switch and charge distribution circuit；Sample circuit is for gathering the voltage of set of cells and carrying out charge distributing；Battery selector switch module gathers the voltage of set of cells by switch；Charge distribution circuit connects comparator；The output of comparator connects digital processing and control module；Digital processing is connected control D/A switch module with control module, and D/A switch module connects charge distribution circuit, and digital processing and control module are by controlling the charge distributing in D/A switch module regulation sample circuit.
The cell voltage supervisory circuit of a kind of fully differential ADC mode the most as claimed in claim 1, it is characterised in that: charge distribution circuit module comprises two the same modules of structure: charge distribution circuit one side of something P and charge distribution circuit one side of something N；Each charge distribution circuit one side of something module ports having Shin, COMP, MSB and LSB；Battery selector switch has the first output terminals A INN and the second output terminals A INP；Battery selector switch is connected respectively to the port SHin and the port SHin of charge distribution circuit one side of something N of charge distribution circuit one side of something P by output terminals A INP and AINN；AINN and AINP is connected by switch S2；The output COMP of charge distribution circuit one side of something P connects the normal phase input end of comparator, the output COMP of charge distribution circuit one side of something N connects the inverting input of comparator；D/A switch module includes the module that two structures are the same: D/A switch P and D/A switch N；Each D/A switch module ports having VMSB, VLSB；Port MSB, LSB of charge distribution circuit one side of something P meets port VMSB, VLSB of D/A switch P；Port MSB, LSB of charge distribution circuit one side of something N meets port VMSB, VLSB of D/A switch P；The output of comparator connects digital processing and control module；Digital processing and control module control D/A switch P and D/A switch N respectively.
The cell voltage supervisory circuit of a kind of fully differential ADC mode the most as claimed in claim 2, it is characterised in that: each D/A switch also ports having VREF, VTEMP and VREFGND；Digital processing is connected port VREF, VTEMP, VREFGND of D/A switch P and port VREF, VTEMP, VREFGND of D/A switch N respectively with control module.
The cell voltage supervisory circuit of a kind of fully differential ADC mode the most as claimed in claim 2, it is characterised in that: battery selector switch module includes n+1 switch, and n is the even number more than 1；N+1 switch one end connect the both positive and negative polarity of series-connected cell in set of cells the most respectively；N is that the other end of the switch of odd number is connected together as the first output terminals A INN；N is 0 or the other end of the switch of even number is connected together as the second output terminals A INP.
The cell voltage supervisory circuit of a kind of fully differential ADC mode the most as claimed in claim 4, it is characterised in that: n+1 switch is high-voltage switch gear.
The cell voltage supervisory circuit of a kind of fully differential ADC mode the most as claimed in claim 2, it is characterised in that: in charge distribution circuit one side of something P or charge distribution circuit one side of something N, input SHin connects electric capacity CS1 and one end of electric capacity CS2；The other end of electric capacity CS1 is connected to level VDDL, simultaneously one end of another termination switch S8 of electric capacity CS1 by switch S2；The other end of electric capacity CS2 is connected to level VDDL, simultaneously one end of another termination switch S9 of electric capacity CS2 by switch S4；Switch S8 the other end and switch S9 the other end link together connect output COMP export simultaneously COMP by switch S5 be connected to level VCML, output COMP connecting valve S10 and switch S11 one end；The other end that the other end of switch S10 is connected to level VDDL Simultaneous Switching S10 by switch S6 connects output MSB；The other end that the other end of switch S11 is connected to level VDDL Simultaneous Switching S11 by switch S7 connects output LSB.
The cell voltage supervisory circuit of a kind of fully differential ADC mode the most as claimed in claim 2, it is characterized in that: D/A switch P or D/A switch N includes the capacitor array module that two structures are identical, and two capacitor array module are respectively as high-order capacitor array module and bit capacitor array module；The port SB of high-order capacitor array module meets VMSB, bit capacitor array module port SB and meets VLSB；Three inputs of high-order capacitor array module and bit capacitor array module connect VREF, VTEMP, VREFGND respectively.
The cell voltage supervisory circuit of a kind of fully differential ADC mode the most as claimed in claim 7, it is characterized in that: capacitor array module is formed according to the electric capacity of binary weighting arrangement by m, one pole plate of all electric capacity links together and meets port SB, and the other end of electric capacity is switched by switch can be alternatively coupled to REF, TEMP or REFGND end respectively.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107306037A (en) * | 2016-04-18 | 2017-10-31 | 西安电子科技大学昆山创新研究院 | A kind of cell voltage supervisory circuit and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107306037A (en) * | 2016-04-18 | 2017-10-31 | 西安电子科技大学昆山创新研究院 | A kind of cell voltage supervisory circuit and method |
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