CN104714085B - A kind of automatic circuit for seeking transmitter current average value - Google Patents
A kind of automatic circuit for seeking transmitter current average value Download PDFInfo
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Abstract
The invention discloses a kind of automatic circuit for seeking transmitter current average value, by variable connector current average unit, comparison signal unit, switch controlling signal unit, current average amplifies transducing unit composition, it is provided with multiple current input terminals, one average value current pick-up output end, can differentiate the input current of each current input terminal whether within 4 20mA effective ranges, and by the mean value calculation of the input electric current within effective range out, and exported from average value current pick-up output end, the occasion for needing to calculate the average value of multiple transmitter currents and export can be used in.
Description
Technical field
The present invention relates to a kind of transducer signal treatment technology, a kind of especially automatic electricity for seeking transmitter current average value
Road.
Background technology
Under many circumstances, the result of same parameters measurement needs to use the average value of multimetering value electric current.Work as measurement
Not enough, particularly measuring system is to use single parameter measurement transmitter at the beginning of design to the Sensor input channel quantity of system
Parameter measurement is carried out with pick-up, it is necessary to increase the quantity of parameter measurement transmitter, makes into use the average value side of multimetering value
During case, measuring system will face the situation for needing to redesign.
The content of the invention
The purpose of the present invention is to provide a solution for the current average of multimetering value is calculated, i.e., can be automatic
Judge the circuit for calculating the average value of multiple transmitter currents and exporting.
To achieve these goals, the invention provides a kind of automatic circuit for seeking transmitter current average value, by multichannel
Switching current averaging unit, comparison signal unit, switch controlling signal unit, current average amplify transducing unit composition.
The variable connector current average unit includes n bars structure and parameter identical variable connector diverter branch 1-
N, n are the integer more than or equal to 2；Every variable connector diverter branch is provided with 1 current input terminal, and each current input terminal can
To access 1 transmitter current loop.The variable connector current average unit is additionally provided with shunting output end.
If i is more than or equal to the 1, integer less than or equal to n, variable connector diverter branch i is provided with input current Ii inputs
With sampling voltage Vi output ends.
The variable connector diverter branch i is by sample resistance Ri, switch Ki1, variable connector Ki2 and shunt resistance
Ri1-Rin is constituted.
The sample resistance Ri is connected in input current Ii loops, and its input current Ii outflow ends are connected to publicly；
The input current Ii of sample resistance Ri flows into end and is set to sampling voltage Vi output ends.
The variable connector Ki2 has 1 common port and n switch terminals, and n switch terminals are switch terminals i1-in；Described point
One end of leakage resistance Ri1-Rin is respectively connecting to switch terminals i1-in, and other end is connected in parallel to shunting output end；Variable connector
Ki2 is controlled by variable connector control signal Sm-S1.
The input current Ii that one end of the switch Ki1 is connected to sample resistance Ri flows into end, and other end is connected to many
The common port of way switch Ki2；The break-make for switching Ki1 is controlled by switch controlling signal SWi.
The variable connector current average unit also includes resistance R0；It is defeated that the two ends of resistance R0 are respectively connecting to shunting
Go out end and publicly.
The comparison signal unit by CA11-CAn1, n upper limit comparator CA12-CAn2 of n lower limit comparator and
Comparison voltage threshold circuit is constituted；The comparison voltage threshold circuit is provided with lower limit comparison voltage threshold value end and upper limit comparison voltage
Threshold value end.
The n lower limit comparator CA11-CAn1 is respectively by sampling voltage V1-Vn and lower limit comparison voltage threshold value ratio
Compared with bottoming comparison signal SW11-SWn1；The n upper limit comparator CA12-CAn2 is respectively by sampling voltage V1-Vn
Compare with upper limit comparison voltage threshold value, output upper limit comparison signal SW12-SWn2.
The switch controlling signal unit is combinational logic circuit；The input signal of switch controlling signal unit is lower limit ratio
Compared with signal SW11-SWn1, upper limit comparison signal SW12-SWn2, output is switch controlling signal SW1-SWn, variable connector control
Signal Sm-S1 processed.
The current average amplifies transducing unit and is provided with pick-up current input terminal, pick-up electrical return and average value electricity
Rheology send output end；The pick-up electrical return is connected to publicly；The pick-up current input terminal is connected to variable connector
The shunting output end of current average unit；The pick-up current input terminal is virtual earth end.
The logic function of the switch controlling signal unit is realized by CPLD.
The function of the variable connector Ki2 and switch Ki1 selects 1 analog switch device CD4051 to realize by 8, be up to 8
Current input terminal.
The current average amplifies transducing unit and is made up of current transducer and triode V01, electric capacity C01.
Foregoing circuit realizes that the method for self adaptation transmitter current average value is：
When switch controlling signal SWi is effective, switch Ki1 conductings；When switch controlling signal SWi is invalid, switch Ki1 disconnects.
When sampling voltage Vi is between lower limit comparison voltage threshold value VREF1 and upper limit comparison voltage threshold value VREF2 scopes
When, switch controlling signal SWi is effective；Otherwise, switch controlling signal SWi is invalid.
The rule for producing variable connector control signal Sm-S1 according to switch controlling signal SW1-SWn is：Sm-S1 is one
Individual m binary coded signal, Sm is highest order, and S1 is lowest order；Have when there is p in n switch controlling signal SW1-SWn
Effect, and p is when being the integer more than or equal to 1, less than or equal to n, the m binary value of binary coded signal is equal to p-1；Work as n
During individual switch controlling signal SW1-SWn void in whole, the m binary value of binary coded signal can be arbitrary value；M takes
Meet expression formula
2m≥n
Smallest positive integral.
Variable connector control signal Sm-S1 control variable connector rule be：The two of variable connector control signal Sm-S1
When scale coding signal binary value is equal to p-1, switch terminals ip and its common port of variable connector Ki2 are connected.
If the value of the sample resistance R1 of variable connector diverter branch 1 is R, the electric current that current average amplifies transducing unit is put
Big multiple is k, and the parameter of each resistance of variable connector current average unit is
The input current effective range that the current input terminal is accessed is 4-20mA.
When determining lower limit comparison voltage threshold value VREF1, VREF1≤4 (k-1)/kR should be met；Determine that the upper limit is more electric
During pressure threshold value VREF2, VREF2 >=20R should be met.
Compared with prior art, its advantage is the present invention：Need to calculate the transmitter current quantity of average value, can be with
It is the arbitrary value within the circuit maximum input terminal quantity；Need multiple transmitter currents of calculating average value, Ke Yiren
Meaning selection input is accessed；Comparison circuit directly differentiates the branch road and quantity of the transmitter current of effective work, is opened using multichannel
The shunt ratio of each variable connector diverter branch of control is closed, then the method that shunt current is added is realized that current average is calculated,
Convenient, flexible, response is fast；When there is input transducer current loop to open a way, the circuit can automatically calculate remaining effectively work
The average value of the transmitter current of work is simultaneously exported.
Brief description of the drawings
Fig. 1 is structured flowchart.
Fig. 2 is variable connector current average unit.
Fig. 3 is comparison signal unit.
Fig. 4 is switch controlling signal unit.
Fig. 5 is that current average amplifies transducing unit.
Fig. 6 is 4 road electric current input mux current average unit embodiments.
Specific embodiment
With reference to embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited
In this.
Structured flowchart of the invention as shown in figure 1, a kind of automatic circuit for seeking transmitter current average value, by variable connector
Current average unit, comparison signal unit, switch controlling signal unit, current average amplify transducing unit composition.
Variable connector current average unit is as shown in Figure 2.
Variable connector diverter branch 1, variable connector diverter branch 2 and variable connector diverter branch n are only depicted in Fig. 2.
The break-make for switching K11-Kn1 is controlled by switch controlling signal SW1-SWn respectively, and the break-make position of variable connector K12-Kn2 is all
Controlled by variable connector control signal Sm-S1.
Comparison signal unit is as shown in Figure 3.
The series connection bleeder circuit of potentiometer RW1, RW2 composition provides lower limit comparison voltage threshold value VREF1 and the upper limit is more electric
Pressure threshold value VREF2.In Fig. 3, lower limit comparison voltage threshold value VREF1 has been connected to all n lower limit comparator CA11-CAn1's
Negative input end, upper limit comparison voltage threshold value VREF2 has been connected to the positive input terminal of all n upper limit comparator CA12-CAn2.
The positive input terminal of lower limit comparator CA11-CAn1 is respectively connecting to sampling voltage V1-Vn, output end bottoming comparison signal
SW11-SWn1；The negative input end of upper limit comparator CA12-CAn2 is respectively connecting to sampling voltage V1-Vn, output end output
Upper limit comparison signal SW12-SWn2.
VREF1 can also be connected to the positive input terminal of lower limit comparator CA11-CAn1, and VREF2 can also be connected to the upper limit
The negative input end of comparator CA12-CAn2；Correspondingly, the connected mode of sampling voltage V1-Vn should also change, i.e., under
The negative input end of limit comparator CA11-CAn1 is respectively connecting to sampling voltage V1-Vn, and upper limit comparator CA12-CAn2 is just
Input is respectively connecting to sampling voltage V1-Vn.
Switch controlling signal cell schematics are as shown in Figure 4.
Switch controlling signal unit is combinational logic circuit, and input signal is SW11-SWn1 and SW12-SWn2, output
Switch controlling signal SW1-SWn and variable connector control signal Sm-S1.The logic function of Fig. 4 is realized using CPLD.
Current average amplifies transducing unit as shown in figure 5, by current transducer U01 and triode V01, electric capacity C01 groups
Into.Current transducer U01 selects XTR115.The colelctor electrode of triode V01, base stage, emitter stage are respectively connecting to current transducer
The power end U+ of U01, base terminal B, emitter terminal E；One end of electric capacity C01 is connected to the power end U+ of current transducer U01, separately
Outer one end is connected to the pick-up current output terminal Iout of current transducer U01.
The current input terminal Iin of current transducer U01 is pick-up current input terminal, and IRET is pick-up electrical return；Electricity
The pick-up current output terminal Iout and power end U+ of flow transmitter U01 collectively constitute average value current pick-up output end IOUT.Electricity
The pick-up electrical return IRET of flow transmitter U01 is connected to publicly, and pick-up current input terminal Iin is virtual earth end.
4 road electric current input mux current average unit embodiments are as shown in Figure 6.
In Fig. 6, variable connector K12-K42 functions are realized by U1-U4 respectively, switch the break-make control function of K11-K41
Also realized by U1-U4.U1-U4 is multiway analog switch device CD4051.
Fig. 6 is illustrated by taking variable connector diverter branch 1 as an example.
U1 is 8 to select 1 analog switch device CD4051, includes common port COM and 8 tunnel ends CH0-CH7, this implementation
Example has only used 4 tunnel ends CH0-CH3 therein, tunnel ends CH0-CH3 to be respectively the switch terminals 11-14 in Fig. 2.
Variable connector control signal S2, S1 is respectively connecting to channel selecting control signal B, A of U1；Due to only using
The channel selecting control signal C of 4 tunnel ends CH0-CH3, U1 is connected to low level.CD4051 has 8 tunnel ends CH0-
CH7, so, the embodiment shown in Fig. 6 at most extends to 8 variable connector diverter branch, in other words, be up to 8 electricity
Stream input.
The function of switching K11 realizes that switch controlling signal SW1 is connected to making for U1 by the enable control end INH of CD4051
Can control end INH；During INH input low levels, common port COM leads to one of them that variable connector control signal S2, S1 is selected
Road termination is logical；During INH input high levels, common port COM disconnects with all of tunnel ends.
Channel selecting control signal B, A of U2, U3, U4 is also respectively coupled to variable connector control signal S2, S1；
The enable control end INH of U2, U3, U4 is then respectively connecting to SW2, SW3, SW4.
Described device is powered by dc source+VCC..
The operation principle of the above-mentioned automatic circuit for seeking transmitter current average value is：
Switch controlling signal SWi can be high level effectively, or Low level effective.Switch controlling signal SWi has
During effect, switch Ki1 conductings；When switch controlling signal SWi is invalid, switch Ki1 disconnects.
The input current effective range that current input terminal is accessed is 4-20mA.Input current Ii flows through sample resistance Ri conversions
It is sampling voltage Vi, comparison signal unit carries out lower limit to sampling voltage Vi and differentiates with the upper limit, obtains lower limit comparison signal SWi1
With upper limit comparison signal SWi2, wherein, upper limit comparison voltage threshold value VREF2 correspondence upper limit current 20mA, lower limit comparison voltage threshold
Value VREF1 correspondence lower currents 4mA.Lower limit comparison signal SWi1 and upper limit comparison signal SWi2 are sent to switch controlling signal list
Unit, switch controlling signal SWi is produced by switch controlling signal unit；When sampling voltage Vi is in lower limit comparison voltage threshold value
When between VREF1 and upper limit comparison voltage threshold value VREF2 scopes, input current Ii within effective range 4-20mA, control by switch
Signal element processed makes switch controlling signal SWi effective according to SWi1 and SWi2；Otherwise, when sampling voltage Vi is more electric in lower limit
When outside pressure threshold value VREF1 and upper limit comparison voltage threshold value VREF2 scopes, switch controlling signal SWi is invalid.
In n current input terminal, it is provided with that p input has accessed transmitter current loop and input current is in 4-20mA
Within the scope of, p is more than or equal to the 1, integer less than or equal to n；Then p switch controlling signal corresponding with the p input current
Effectively, the switch conduction of corresponding p bars variable connector diverter branch, shunts to respective input current；The p bar multichannels are opened
The shunt current for closing diverter branch collects in shunting output end.Shunting output end has been connected to pick-up current input terminal, becomes power transmission
Stream input be virtual earth end, i.e., with publicly be isopotential point.The shunt current of each variable connector diverter branch is in pick-up electric current
Input is added, and realizes the calculating of current average.
If IΣIt is the p input current value sum, then the average value current that current average amplifies transducing unit output is
The average value of the p input current, i.e.,
IOUT=IΣ/p。
In other words, average value current IOUT is the 1/p electric current sums of p current input terminal each input current.Each
The 1/p electric currents of input current are realized by the variable connector diverter branch in variable connector current average unit.
Current average amplifies pick-up output again after transducing unit amplifies to input current, i.e.,
IOUT=kISUM
In formula, k is the current amplification factor that current average amplifies transducing unit, ISUMIt is variable connector current average
The shunting output end current of unit.Therefore, the shunt ratio of variable connector diverter branch is 1/ (kp).
Switch controlling signal unit produces variable connector control signal Sm-S1 according to switch controlling signal SW1-SWn, its
Rule is：Sm-S1 is a m binary coded signal, and Sm is highest order, and S1 is lowest order；When n switch controlling signal
There is p in SW1-SWn effectively, and p is when being the integer more than or equal to 1, less than or equal to n, the m the two of binary coded signal
Hex value is equal to p-1；When n switch controlling signal SW1-SWn void in whole, the m the two of binary coded signal is entered
Value processed can be arbitrary value；M takes and meets expression formula
2m≥n
Smallest positive integral.
Variable connector control signal Sm-S1 control variable connector rule be：The two of variable connector control signal Sm-S1 enter
When encoded signal binary value processed is equal to p-1, switch terminals ip and its common port of variable connector Ki2 are connected.
Each resistance parameter of variable connector diverter branch 1 is calculated as follows, if the resistance of sample resistance R1 is R, the span of R
In 50 Ω -200 Ω.The shunt ratio of R11 is 1/k, is had
R11=(k-1) R
The shunt ratio of R12 is 1/ (2k), is had
R12=(2k-1) R
The shunt ratio of R1n is 1/ (nk), is had
R1n=(nk-1) R
Have
R1y=(yk-1) R y=1,2 ..., n
The structure of variable connector diverter branch 1-n is consistent with parameter, integrates, variable connector current average unit
The parameter of each resistance is
When in n current input terminal, there is no input input current within the scope of 4-20mA when, variable connector shunting
The switch of branch road disconnects, ISUMEqual to 0.The effect of resistance R0 is the input impedance for reducing now pick-up current input terminal.Due to
Pick-up current input terminal is virtual earth end, so no electric current flows through on resistance R0.
For 4 road electric current input mux current average unit embodiments shown in Fig. 6, lower limit comparator CA11-
CA41 and upper limit comparator CA12-CA42 uses connection shown in Fig. 3, has
Switch controlling signal SWi Low level effectives, it is between lower limit comparison signal SWi1, upper limit comparison signal SWi2
Relation is NAND Logic, that is, have
Due to n=4, therefore there is m=2.When having p in switch controlling signal SW1-SW4 effectively (for low level), multichannel
The binary value of switch controlling signal S2, S1 is equal to p-1.The logical relation of S2, S1 and switch controlling signal SW1-SW4 is shown in Table
1。
Table 1
| SW1 | SW2 | SW3 | SW4 | S2 | S1 |
| 0 | 0 | 0 | 0 | 1 | 1 |
| 0 | 0 | 0 | 1 | 1 | 0 |
| 0 | 0 | 1 | 0 | 1 | 0 |
| 0 | 0 | 1 | 1 | 0 | 1 |
| 0 | 1 | 0 | 0 | 1 | 0 |
| 0 | 1 | 0 | 1 | 0 | 1 |
| 0 | 1 | 1 | 0 | 0 | 1 |
| 0 | 1 | 1 | 1 | 0 | 0 |
| 1 | 0 | 0 | 0 | 1 | 0 |
| 1 | 0 | 0 | 1 | 0 | 1 |
| 1 | 0 | 1 | 0 | 0 | 1 |
| 1 | 0 | 1 | 1 | 0 | 0 |
| 1 | 1 | 0 | 0 | 0 | 1 |
| 1 | 1 | 0 | 1 | 0 | 0 |
| 1 | 1 | 1 | 0 | 0 | 0 |
| 1 | 1 | 1 | 1 | × | × |
In table 1, when void in whole in switch controlling signal SW1-SW4, S2, S1 can take arbitrary value, now SW1-
K11-K41 is all off for SW4 Signal-controlled switches, ISUMEqual to 0, average value current IOUT is equal to 0.
The logic function of formula (2) and table 1 is realized more convenient using CPLD, it is also possible to which selection realizes that combination is patrolled using other
The mode for collecting function is realized, for example, realized using nonvolatile memory, or Size combination logical integrated circuit in use
Design is realized.
Selection R=100 Ω, current average shown in Fig. 5 amplifies the current amplification factor k=100 of transducing unit, in Fig. 6
Each resistance according to formula (1) value, have
In the variable connector current average unit shown in Fig. 2, when the switch Ki1 of variable connector diverter branch i is turned on
When, its shunt ratio is 1/ (kp), and sampling voltage Vi is
Vi=(kp-1)/(kp) RIi
When the switch Ki1 of variable connector diverter branch i disconnects, sampling voltage Vi is
Vi=RIi
It is not fixed proportionate relationship between sampling voltage Vi and input current Ii, proportionality coefficient is R to the maximum, minimum
(k-1)/kR, differs 1/k between the two.K values are bigger, and shunt ratio relation is smaller, sampling voltage Vi and input current Ii it
Between proportionate relationship change it is smaller.The k values of circuit shown in Fig. 5 are 100, and the ratio between sampling voltage Vi and input current Ii is closed
The maximum difference 1% of system.
When determining lower limit comparison voltage threshold value VREF1, should meet
VREF1≤4·(k-1)/k·R
When determining upper limit comparison voltage threshold value VREF2, should meet
VREF2≥20·R
To ensure input current Ii within the scope of normal 4-20mA when, corresponding switch controlling signal SWi is effective.Example
Such as, as R=100 Ω, during k=100, it should meet
It is required that judging input current Ii whether when the border allowance within the scope of normal 4-20mA is smaller, can use larger
VREF1 values and less VREF2 values, for example, take VREF1=0.39V, VREF2=2.01V；It is required that judging input current Ii
Whether when the border allowance within the scope of normal 4-20mA is larger, less VREF1 values and larger VREF2 values are can use,
For example.Take VREF1=0.2V, VREF2=2.2V.
In n current input terminal, any therein can be arbitrarily selected to access the transmitter for needing to calculate average value
Current loop；In the transmitter current loop for having accessed, there is the p input current of current input terminal to be in normal 4-20mA
Within the scope of when, the current average circuit has automatic decision and an adaptation function, the output of electric current transmission circuit it is average
Value electric current IOUT is the p average value of current input terminal input current.
Embodiments of the invention are the foregoing is only, is not intended to limit the invention, come for those skilled in the art
Say, the present invention there can be various modifications and variations.It is all any modifications within the spirit and principles in the present invention, made, equivalent
Replace, improve etc., should be included within scope of the presently claimed invention.
Claims (7)
1. a kind of automatic circuit for seeking transmitter current average value, it is characterised in that：
Pick-up is amplified by variable connector current average unit, comparison signal unit, switch controlling signal unit, current average
Unit is constituted；
The variable connector current average unit includes that n bars structure is with parameter identical variable connector diverter branch 1-n, n
Integer more than or equal to 2；Every variable connector diverter branch is provided with 1 current input terminal；The variable connector current average
Unit is additionally provided with shunting output end；
If i is more than or equal to the 1, integer less than or equal to n, variable connector diverter branch i is provided with input current Ii inputs and takes
Sample voltage Vi output ends；
The variable connector diverter branch i is by sample resistance Ri, switch Ki1, variable connector Ki2 and shunt resistance Ri1-Rin
Composition；
The sample resistance Ri is connected in input current Ii loops, and its input current Ii outflow ends are connected to publicly；Sampling
The input current Ii of resistance Ri flows into end and is set to sampling voltage Vi output ends；
The variable connector Ki2 has 1 common port and n switch terminals；The n switch terminals are switch terminals i1-in；Described point
One end of leakage resistance Ri1-Rin is respectively connecting to switch terminals i1-in, and other end is connected in parallel to shunting output end；Variable connector
Ki2 is controlled by variable connector control signal Sm-S1；
The input current Ii that one end of the switch Ki1 is connected to sample resistance Ri flows into end, and other end is connected to multichannel and opens
Close the common port of Ki2；
The break-make for switching Ki1 is controlled by switch controlling signal SWi；When switch controlling signal SWi is effective, switch Ki1 conductings；Switch
When control signal SWi is invalid, switch Ki1 disconnects；Sampling voltage Vi is in lower limit comparison voltage threshold value VREF1 and the upper limit is more electric
When between pressure threshold value VREF2 scopes, switch controlling signal SWi is effective；Otherwise, switch controlling signal SWi is invalid；
The variable connector current average unit also includes resistance R0；The two ends of resistance R0 are respectively connecting to shunt output end
Publicly；
The current average amplifies transducing unit and is provided with the change of pick-up current input terminal, pick-up electrical return and average value current
Send output end；The pick-up electrical return is connected to publicly；The pick-up current input terminal is connected to variable connector electric current
The shunting output end of averaging unit；The pick-up current input terminal is virtual earth end；
The comparison signal unit is by CA11-CAn1, n upper limit comparator CA12-CAn2 of n lower limit comparator and compares
Voltage threshold circuit is constituted；The comparison voltage threshold circuit is provided with lower limit comparison voltage threshold value end and upper limit comparison voltage threshold value
End；
The n lower limit comparator CA11-CAn1 respectively compares sampling voltage V1-Vn with lower limit comparison voltage threshold value, defeated
Go out lower limit comparison signal SW11-SWn1；The n upper limit comparator CA12-CAn2 respectively by sampling voltage V1-Vn with it is upper
Limit comparison voltage threshold value compares, output upper limit comparison signal SW12-SWn2；
The switch controlling signal unit is combinational logic circuit；The input signal of switch controlling signal unit is that lower limit compares letter
Number SW11-SWn1, upper limit comparison signal SW12-SWn2, output are switch controlling signal SW1-SWn, variable connector control letter
Number Sm-S1；
Variable connector control signal Sm-S1 is determined that its rule is by switch controlling signal SW1-SWn：Sm-S1 is one m
Binary coded signal, Sm is highest order, and S1 is lowest order；When having p in n switch controlling signal SW1-SWn effectively, and p
When being the integer more than or equal to 1, less than or equal to n, the m binary value of binary coded signal is equal to p-1；When n switch
During control signal SW1-SWn void in whole, the m binary value of binary coded signal can be arbitrary value；M takes and meets table
Up to formula
2m≥n
Smallest positive integral；
Variable connector control signal Sm-S1 control variable connector rule be：The binary system of variable connector control signal Sm-S1
When encoded signal binary value is equal to p-1, switch terminals ip and its common port of variable connector Ki2 are connected；
If the value of sample resistance R1 is R in variable connector diverter branch 1, current average amplifies the Current amplifier of transducing unit
Multiple is k, and the parameter of each resistance of variable connector current average unit is
2. the circuit of transmitter current average value is sought automatically as claimed in claim 1, it is characterised in that：The switch control letter
The logic function of number unit is realized by CPLD.
3. the circuit of transmitter current average value is sought automatically as claimed in claim 1, it is characterised in that：The variable connector
The function of Ki2 and switch Ki1 selects 1 analog switch device CD4051 to realize by 8.
4. the circuit of transmitter current average value is sought automatically as claimed in claim 3, it is characterised in that：Be up to 8 electric currents
Input.
5. the circuit of transmitter current average value is sought automatically as claimed in claim 1, it is characterised in that：The current average
Amplify transducing unit to be made up of current transducer and triode V01, electric capacity C01.
6. the circuit of transmitter current average value is sought automatically as claimed in claim 1, it is characterised in that：The current input terminal
The input current effective range of access is 4-20mA.
7. the circuit of transmitter current average value is sought automatically as claimed in claim 1, it is characterised in that：Determine that lower limit is more electric
During pressure threshold value VREF1, VREF1≤4 (k-1)/kR should be met；When determining upper limit comparison voltage threshold value VREF2, should meet
VREF2≥20·R。
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080246460A1 (en) * | 2007-04-03 | 2008-10-09 | Eric Smith | Method and apparatus for measuring the output current of a switching regulator |
| CN102739228A (en) * | 2011-04-12 | 2012-10-17 | 英飞凌科技股份有限公司 | Circuit for determining an average value |
| CN203967977U (en) * | 2014-06-30 | 2014-11-26 | 成都芯源系统有限公司 | Switch regulating circuit and mean current detection circuit thereof |
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| CN104714085A (en) | 2015-06-17 |
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