CN112649763A - High-precision arbitrary value capacitor output device and output method - Google Patents
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Abstract
The invention provides a high-precision arbitrary value capacitor output device and an output method thereof, wherein the high-precision arbitrary value capacitor output device comprises a capacitor output instruction C for inputting a capacitor output instructionxThe external instruction input unit, the control unit and the precise capacitor bank; the control unit comprises a calculation unit, an interface unit connected with the calculation unit and an external instruction input unit, and an execution unit connected with the calculation unit and the precise capacitor bank; the precise capacitor bank unit is internally provided with a plurality of groups of precise capacitors, and the execution unit is internally provided with an execution element which corresponds to and is connected with the precise capacitors and controls the on-off of the precise capacitors. The method combines high-precision precise capacitors in a mode of advance, and realizes the output of any high-precision capacitance value so as to meet different requirements of tests.
Description
Technical Field
The invention belongs to the technical field of capacitance signal simulation of semi-physical simulation verification tests, and particularly relates to a high-precision arbitrary value capacitance output device and an output method.
Background
In the occasions such as aircraft fuel oil measurement system detection and semi-physical simulation verification tests, any capacitance signal with high precision needs to be output by the analog oil quantity sensor, so that any capacitance can be timely and accurately output by the capacitance output device, the capacitance output device at the present stage adopts a fixed point position output mode, only few characteristic capacitance values can be contained, the requirement of any output cannot be met, and the capacitance output device is large in size, slow to operate, inconvenient to use and incapable of meeting the requirements of detection and tests. In the application of the fields such as aircraft fuel measurement, the test requirements for capacitance signals are variable, the range change span is large, and the existing technology is difficult to meet the test requirements of high range, fast response and high precision.
Disclosure of Invention
The invention provides a high-precision arbitrary value capacitor output device and an output method aiming at the defects and the requirements in the prior art, and the high-precision arbitrary value capacitor output device and the output method realize the output of the high-precision arbitrary value capacitor by arranging a plurality of precise capacitors with different capacitance values of which the capacitance precision value is more than or equal to multiple, unifying and combining in a mode-entering mode, and meeting different requirements of tests.
The specific implementation content of the invention is as follows:
the invention provides a high-precision arbitrary value capacitor output device which is used for outputting a required capacitance value and comprises an input capacitor output instruction CxThe external instruction input unit, the control unit and the precise capacitor bank;
the control unit comprises a calculation unit, an interface unit connected with the calculation unit and an external instruction input unit, and an execution unit connected with the calculation unit and the precise capacitor bank;
the precise capacitor bank unit is internally provided with a plurality of groups of precise capacitors, and the execution unit is internally provided with an execution element which corresponds to and is connected with the precise capacitors and controls the on-off of the precise capacitors.
In order to better implement the present invention, further, the precision capacitors are capacitors with capacitance values that are different multiples of the capacitance precision value C of the output capacitance value of the high-precision arbitrary-value capacitor output device.
The invention provides a high-precision arbitrary value capacitor output method, which is based on the high-precision arbitrary value capacitor output device and comprises the following steps:
step S1: user inputs capacitance output command C in external command input unitxThe capacitor outputs a command CxThe value of (a) is the value of the actual required specific capacitance;
step S2: setting the output capacitance precision value of the high-precision arbitrary value capacitance output device to beC, the range of input capacitance value is 0-Cm；
Step S3: outputting an instruction C at the computing unit according to the capacitancexAnd calculating the set capacitance precision C to obtain a logic combination value Lx；
Step S4: setting a group of precision capacitors in the range of different multiples of precision capacitor C in the precision capacitor group, and obtaining a logic combination value LxSelecting different precise capacitors in a binary system form for combination; and the calculating unit selects the corresponding executing element in the executing unit to control the on-off of the precise capacitor according to the combination result, and combines the required specific capacitance value for output.
In order to better implement the present invention, further, the form of the scale includes binary, ternary, quaternary, quinary, hexaary, heptaary, octary, nonary, and decimal.
In order to better implement the present invention, further, when the selected binary form is binary, the precision capacitors are arranged in the order of capacitance values from small to large as follows: c1、C2、C3...Ci...Cn(ii) a I is more than or equal to 1 and less than or equal to n, i is an integer, and n is more than or equal to m;
the capacitance value C of the precision capacitor 11=C=C*20；
The capacitance value C of the precision capacitor 22=C1*2=C*21；
... ...
The capacitance value C of the precision capacitor iiIs C2i-1；
... ...
The capacitance value C of the precision capacitor nn= Cn-1*2=C*2n-1；
Calculating to obtain the maximum output capacitance value of the high-precision arbitrary value capacitance output device as sigma Cn=C*(2n-1), said ∑ Cn≧Cm。
In order to better implement the invention, further, when the selected binary system is decimal, the precise capacitor units are arranged, and the capacitance values are respectively as follows in sequence from small to large: cZ1、CZ2、CZ3...CZi...CZn(ii) a I is more than or equal to 1 and less than or equal to n, i is an integer, and n is more than or equal to m;
a capacitance value C of the precision capacitance unit 1Z1=[ C*100：C*101)；
... ...
Capacitance value C of the precision capacitance unit iZi=[ C*10i-1：C*10i)；
... ...
A capacitance value C of the precision capacitance unit nZn=[ C*10n-1：C*10n)；
Wherein, the CZn=[ C*10n-1：C*10n) Representing the sum of outputs equal to or greater than C10n-1And less than C10nC10 of (A)n-1The multiple of the capacitance value is small unit, namely C10 can be outputn-1*1，C*10n-1*2，C*10n-1*3，C*10n-1*4，C*10n-1*5，C*10n-1*6，C*10n-1*7，C*10n-1*8，C*10n-19 small units of any capacitance value, wherein the precise capacitance unit is a precise capacitance combination comprising a plurality of groups of sequentially adjacent precise capacitances.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention can be applied to the situation that the capacitance output is complicated and changeable, for example, in the occasions of aircraft fuel oil measurement system detection, semi-physical simulation verification test and the like, when the analog oil quantity sensor is required to output a complicated high-precision capacitance signal, the invention can send a capacitance output instruction by the test control system through the bus, and output the capacitance value required by the test timely and accurately for the test device to collect so as to meet the requirements of complicated and diversified capacitance output of the test. The invention can continuously improve the output precision of the capacitor along with the improvement of the capacitor manufacturing technology in practical application without secondary research and development. The output range of the device of the invention can be infinitely extended as required. The device can be packaged in a modularized manner, is freely expanded, is easy to realize, is flexible and convenient to use, has remote control capability, and has wide application prospect in explosion-proof and other dangerous environments or isolation spaces.
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FIG. 1 is a schematic diagram of the connection relationship between modules of the apparatus of the present invention.
Detailed Description
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and therefore should not be considered as a limitation to the scope of protection. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
the present embodiment provides a high-precision arbitrary-value capacitor output device for outputting a required capacitance value, where the high-precision arbitrary-value capacitor output device includes a capacitor output instruction C for inputting a capacitor output instructionxThe external instruction input unit, the control unit and the precise capacitor bank;
the control unit comprises a calculation unit, an interface unit connected with the calculation unit and an external instruction input unit, and an execution unit connected with the calculation unit and the precise capacitor bank;
a plurality of groups of precise capacitors are arranged in the precise capacitor group unit, and an actuating element which corresponds to and is connected with the precise capacitors and controls the on-off of the precise capacitors is arranged in the actuating unit;
in order to better implement the present invention, further, the precision capacitors are capacitors with capacitance values that are different multiples of the capacitance precision value C of the output capacitance value of the high-precision arbitrary-value capacitor output device.
The working principle is as follows: referring to fig. 1, the high-precision capacitor output device includes two units, namely a control unit and a precision capacitor bank. The control unit comprises a calculation unit for calculating a capacitance value combination output scheme, an execution unit for gating the precise capacitors in the precise capacitor bank and an interface unit for receiving an external capacitor output instruction, wherein the precise capacitor bank comprises a series of precise capacitors selected according to precision and a counting system by a bit advance method. The computing unit mainly comprises an AVR microcontroller and a peripheral circuit, the execution unit mainly comprises a driving circuit and a control gating circuit, and the interface unit mainly comprises a bus chip and a peripheral circuit.
Example 2:
the embodiment also provides a high-precision arbitrary value capacitor output method, which is based on the high-precision arbitrary value capacitor output device and comprises the following steps:
step S1: user inputs capacitance output command C in external command input unitxThe capacitor outputs a command CxThe value of (a) is the value of the actual required specific capacitance;
step S2: setting the precision value of the output capacitor of the high-precision arbitrary value capacitor output device to be C, and setting the range of the input capacitance value to be 0-Cm；
Step S3: outputting an instruction C at the computing unit according to the capacitancexAnd calculating the set capacitance precision C to obtain a logic combination value Lx；
Step S4: setting a group of precision capacitors in the range of different multiples of precision capacitor C in the precision capacitor group, and obtaining a logic combination value LxSelecting different precise capacitors in a binary system form for combination; and the calculating unit selects the corresponding executing element in the executing unit to control the on-off of the precise capacitor according to the combination result, and combines the required specific capacitance value for output. The form of the binary system comprises binary system, ternary system, quaternary system, quinary system, heptaary system, octal system and nonal systemDecimal, etc.
Other parts of this embodiment are the same as those of embodiment 1, and thus are not described again.
Example 3:
in this embodiment, on the basis of the foregoing embodiment 2, in order to better implement the present invention, further, when the selected binary form is binary, the precision capacitors are arranged in order from small to large according to capacitance values, respectively, as follows: c1、C2、C3...Ci...Cn(ii) a I is more than or equal to 1 and less than or equal to n, i is an integer, and n is more than or equal to m;
the capacitance value C of the precision capacitor 11=C=C*20；
The capacitance value C of the precision capacitor 22=C1*2=C*21；
... ...
The capacitance value C of the precision capacitor iiIs C2i-1；
... ...
The capacitance value C of the precision capacitor nn= Cn-1*2=C*2n-1；
Calculating to obtain the maximum output capacitance value of the high-precision arbitrary value capacitance output device as sigma Cn=C*(2n-1), said ∑ Cn≧Cm。
The other parts of this embodiment are the same as those of embodiment 2, and thus are not described again.
Example 4:
in this embodiment, based on the above embodiment 3, the output accuracy C =0.1pF is determined, and the output range is 0 to 100pF, that is, the maximum output capacitance C is determinedm=100pF, using binary bit-rate, by the formula C (2)n-1)≧CmThe number of precision capacitors n =10 of the precision capacitor bank can be determined, including the precision capacitors: c1=C*20=0.1pF，C2=C*21=0.2pF，C3=C*22=0.4pF，C4=C*23=0.8pF，C5=C*24=1.6pF，C6=C*25=3.2pF，C7=C*26=6.4pF，C8=C*27=12.8pF，C9=C*28=25.6pF，C10=C*29=51.2pF。
When the interface unit outputs the received capacitance output instruction CxAfter being transferred to the computing unit, the computing unit utilizes CxLogically combining the value L with the control port of the interface unitxThe relationship between: cx=C*LxThe actual logical combination value L can be determinedxTherefore, the gating signal is determined, the execution unit is controlled to execute the gating of the precise capacitor bank, and the output of the capacitor required by the instruction is realized.
Such as: command capacitance of CxWhen =33.3pF, the formula C is usedx=C*LxObtaining Lx=333, post logical decomposition (i.e. conversion to binary) Lx=101001101 (binary), the precise capacitance C that the execution unit needs to be gated can be obtained1，C3，C4，C7，C9And realizing the output of the instruction capacitor.
And (3) verification: gated capacitive sum = C1+C3+C4+C7+C9= (0.1 +0.4+0.8+6.4+ 25.6) pF =33.3pF, corresponding to the command capacitance 33.3 pF.
The other parts of this embodiment are the same as those of embodiment 3, and thus are not described again.
Example 5:
in this embodiment, on the basis of any one of the above embodiments 3 to 4, when the selected binary system is decimal, the precision capacitor units are arranged, and the capacitance values are sorted from small to large as follows: cZ1、CZ2、CZ3...CZi...CZn(ii) a I is more than or equal to 1 and less than or equal to n, i is an integer, and n is more than or equal to m;
a capacitance value C of the precision capacitance unit 1Z1=[ C*100：C*101)；
... ...
Capacitance value C of the precision capacitance unit iZi=[ C*10i-1：C*10i)；
... ...
A capacitance value C of the precision capacitance unit nZn=[ C*10n-1：C*10n)；
Wherein, the CZn=[ C*10n-1：C*10n) Representing the sum of outputs equal to or greater than C10n-1And less than C10nC10 of (A)n-1The multiple of the capacitance value is small unit, namely C10 can be outputn-1*1，C*10n-1*2，C*10n-1*3，C*10n-1*4，C*10n-1*5，C*10n-1*6，C*10n-1*7，C*10n-1*8，C*10n-19 small units of any capacitance value; precision capacitor cell CznIs a method for combining a plurality of precise capacitors which are adjacent in sequence to satisfy [ C10 [ ]n-1：C*10n) A small set of (a). The precision capacitor cell may be C10n-1*1，C*10n-1*2，C*10n-1*3，C*10n-1*4，C*10n-1*5，C*10n-1*6，C*10n-1*7，C*10n-1*8，C*10n-1Small set of 9, or C10n-1，C*10n-1*2，C*10n-1*4，C*10n-1Small set of 8, or C10n-1，C*10n-1*2，C*10n-1*4，C*10n-1Small set of 5, or C10n-1，C*10n-1*2，C*10n-1*4，C*10n -1A small set of 6, and so on. The calculation methods under the binary system and the decimal system are given, and the calculation methods of other binary systems are similar to the binary system and the decimal system, are unified under the same binary system standard, and are spliced and combined for different capacitors under the same binary system according to calculation results, so that the output capacitance value is realized.
Other parts of this embodiment are the same as any of embodiments 3 to 4, and thus are not described again.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.
Claims (6)
1. High-precision arbitrary value capacitor output device for output stationA required capacitance value, characterized by comprising an output command C for inputting capacitancexThe external instruction input unit, the control unit and the precise capacitor bank;
the control unit comprises a calculation unit, an interface unit connected with the calculation unit and an external instruction input unit, and an execution unit connected with the calculation unit and the precise capacitor bank;
the precise capacitor bank unit is internally provided with a plurality of groups of precise capacitors, and the execution unit is internally provided with an execution element which corresponds to and is connected with the precise capacitors and controls the on-off of the precise capacitors.
2. A high accuracy arbitrary value capacitor output device as claimed in claim 1, wherein said precision capacitors are capacitors having capacitance values that are different multiples of a capacitance precision value C of the output capacitance value of the high accuracy arbitrary value capacitor output device.
3. A high-precision arbitrary value capacitance output method is based on the high-precision arbitrary value capacitance output device of claim 1, and is characterized by comprising the following steps:
step S1: user inputs capacitance output command C in external command input unitxThe capacitor outputs a command CxThe value of (a) is the value of the actual required specific capacitance;
step S2: setting the precision value of the output capacitor of the high-precision arbitrary value capacitor output device to be C, and setting the range of the input capacitance value to be 0-Cm；
Step S3: outputting an instruction C at the computing unit according to the capacitancexAnd calculating the set capacitance precision C to obtain a logic combination value Lx；
Step S4: setting a group of precision capacitors in the range of different multiples of precision capacitor C in the precision capacitor group, and obtaining a logic combination value LxSelecting different precise capacitors in a binary system form for combination; and the calculating unit selects the corresponding executing element in the executing unit to control the on-off of the precise capacitor according to the combination result, and combines the required specific capacitance value for output.
4. A high accuracy arbitrary value capacitance output method as claimed in claim 3, wherein said binary form comprises binary, ternary, quaternary, quinary, hexaary, heptaary, octary, nonary, decimal.
5. A high-precision arbitrary-value capacitor output method as claimed in claim 4, wherein when the selected binary form is binary, the precision capacitors are arranged in order of capacitance values from small to large as: c1、C2、C3...Ci...Cn(ii) a I is more than or equal to 1 and less than or equal to n, i is an integer, and n is more than or equal to m;
the capacitance value C of the precision capacitor 11=C=C*20；
The capacitance value C of the precision capacitor 22=C1*2=C*21；
... ...
The capacitance value C of the precision capacitor iiIs C2i-1；
... ...
The capacitance value C of the precision capacitor nn= Cn-1*2=C*2n-1；
Calculating to obtain the maximum output capacitance value of the high-precision arbitrary value capacitance output device as sigma Cn=C*(2n-1), said ∑ Cn≧Cm。
6. A high-precision arbitrary-value capacitor output method as claimed in claim 4, wherein when the selected binary form is decimal, the precision capacitor units are arranged, and the capacitance values are respectively: cZ1、CZ2、CZ3...CZi...CZn(ii) a I is more than or equal to 1 and less than or equal to n, i is an integer, and n is more than or equal to m;
a capacitance value C of the precision capacitance unit 1Z1=[ C*100：C*101)；
... ...
The precision capacitorCapacitance C of cell iZi=[ C*10i-1：C*10i)；
... ...
A capacitance value C of the precision capacitance unit nZn=[ C*10n-1：C*10n)；
Wherein, the CZn=[ C*10n-1：C*10n) Representing the sum of outputs equal to or greater than C10n-1And less than C10nC10 of (A)n-1The multiple of the capacitance value is small unit, namely C10 can be outputn-1*1，C*10n-1*2，C*10n-1*3，C*10n-1*4，C*10n-1*5，C*10n -1*6，C*10n-1*7，C*10n-1*8，C*10n-19 small units of any capacitance value, wherein the precise capacitance unit is a precise capacitance combination comprising a plurality of groups of sequentially adjacent precise capacitances.
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| CN110658746A (en) * | 2019-08-26 | 2020-01-07 | 西安沃祥航空科技有限公司 | Program-controlled capacitor device based on capacitor array |
| CN110895292A (en) * | 2019-12-04 | 2020-03-20 | 四川泛华航空仪表电器有限公司 | Compensation method for precisely controlling capacitance value |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5905398A (en) * | 1997-04-08 | 1999-05-18 | Burr-Brown Corporation | Capacitor array having user-adjustable, manufacturer-trimmable capacitance and method |
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