CN102571089B - The control system of analog-to-digital conversion and digital-to-analogue conversion method for self-calibrating and application the method - Google Patents
The control system of analog-to-digital conversion and digital-to-analogue conversion method for self-calibrating and application the method Download PDFInfo
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Abstract
The embodiment of the invention discloses the control system of analog-to-digital conversion and digital-to-analogue conversion method for self-calibrating and application the method, efficiency low problem large with the workload solving the existence of existing calibration steps.Described system comprises processor, DAC, ADC, controlled device and selector switch; Described method comprises: described system electrification, controls selector switch, makes system be in calibration mode; Digital quantity input signal is input to DAC by processor, and control DAC and ADC executive signal conversion successively, export real figure amount by ADC and output signal; Digital quantity input signal described in processor collection corresponding record and real figure amount output signal; Processor, according to described digital quantity input signal, the reference voltage of DAC and the reference voltage of ADC, calculates theoretical digital quantity output signal; Processor is analyzed digital quantity input signal, real figure amount output signal and theoretical digital quantity output signal, draws the corrected parameter of ADC and DAC; Processor is revised ADC and DAC according to described corrected parameter.
Description
Technical Field
The invention relates to the technical field of analog-to-digital conversion and digital-to-analog conversion, in particular to an analog-to-digital conversion and digital-to-analog conversion self-calibration method and a control system applying the method.
Background
Among the existing control systems, there is a control system having both an analog-to-digital conversion module (ADC) and a digital-to-analog conversion module (DAC), as shown in fig. 1, the system includes a processor 101, a digital-to-analog conversion module (DAC)102, an analog-to-digital conversion module (ADC)103, and a controlled device 104. The working process of the system is as follows: the processor 101 transmits a digital quantity control signal Data1 to the DAC102, and the DAC102 converts Data1 into an analog quantity output signal Ui1 under the control of the processor and outputs the analog quantity output signal Ui1 to the controlled device 104 to control the controlled device; the ADC103 collects the analog quantity Ui2 fed back by the controlled device 104 under the control of the processor 101, converts the analog quantity Ui2 into a digital quantity feedback signal Data2 and transmits the digital quantity feedback signal Data2 to the processor 101, and the processor 101 performs a series of Data processing according to the Data2 and a built-in algorithm to obtain a new digital quantity control signal Data1 with a better control effect, thereby realizing the closed-loop control of the external device. In order to eliminate the closed-loop control error of the system and improve the control precision, the system needs to be calibrated, wherein the calibration is mainly performed on the DAC and the ADC.
The calibration method adopted in the prior art is to calibrate the DAC and the ADC separately. The DAC is first calibrated: the processor sequentially performs point fetching on Data1 according to a preset acquisition point and inputs the points into the DAC, an oscilloscope or a related high-precision measuring instrument is used for measuring an analog output signal Ui1 of the DAC, and Ui1 is used as an actual output value for recording; calculating a theoretical output value Ui1 'corresponding to each preset acquisition point by using a DAC conversion formula D1/Uref1 ═ Data1/Ui 1' according to the reference voltage Uref1 and the maximum input value D1 of the DAC; and comparing the Ui1 with the Ui 1' and performing corresponding fitting treatment, and correcting the control output Ui1 of the DAC to meet the required requirement. The ADC is then calibrated: an external signal source inputs an analog voltage signal Ui2 to an ADC, a processor performs point fetching on Ui2 according to preset acquisition points, and a digital quantity output value (namely an actual output value) Data2 corresponding to each preset acquisition point is read and recorded; calculating a theoretical output value Data2 'corresponding to each preset acquisition point by using an ADC conversion formula Uref2/D2 ═ Ui2/Data 2' according to the reference voltage Uref2 and the maximum output value D2 of the ADC; and comparing the corresponding Data 2' and Data2 and performing corresponding Data processing, and correcting the conversion input Ui2 of the ADC according to the Data processing result to meet the required requirement.
In the calibration method, data recording and data processing are completed by manual operation, so that the calibration method has large workload and low efficiency.
Disclosure of Invention
In view of this, the invention provides an analog-to-digital conversion and digital-to-analog conversion self-calibration method and a control system applying the method, so as to solve the problems of large workload and low efficiency in the prior art.
In order to achieve the purpose, the invention provides the following technical scheme:
a self-calibration method for analog-to-digital conversion and digital-to-analog conversion is based on a control system, wherein the system comprises a processor, a digital-to-analog conversion module DAC, an analog-to-digital conversion module ADC, controlled equipment and a selection switch; wherein,
the output end of the processor is connected with the input end of the DAC, and the input end of the controller is connected with the output end of the ADC;
the selection switch is used for changing the connection state among the DAC, the ADC and the controlled equipment, so that the system is in a calibration mode or a control mode; wherein,
a first port of the selection switch is connected with the output end of the DAC, a second port of the selection switch is connected with the input end of the ADC, a third port of the selection switch is connected with the input end of the controlled device, and a fourth port of the selection switch is connected with the output end of the controlled device;
when the first port is connected with the second port, the first port is disconnected with the third port, and the second port is disconnected with the fourth port, the system is in a calibration mode; when the first port is disconnected from the second port, the first port is connected with the third port, and the second port is connected with the fourth port, the system is in a control mode;
the method comprises the following steps:
the system is powered on, and the selection switch is controlled to enable the system to be in a calibration mode;
the processor inputs a digital quantity input signal into the DAC, controls the DAC and the ADC to sequentially execute signal conversion, and outputs an actual digital quantity output signal through the ADC;
the processor collects and correspondingly records the digital quantity input signal and the actual digital quantity output signal;
the processor calculates a theoretical digital quantity output signal according to the digital quantity input signal, the reference voltage of the DAC and the reference voltage of the ADC;
the processor analyzes the digital quantity input signal, the actual digital quantity output signal and the theoretical digital quantity output signal to obtain correction parameters of the ADC and the DAC;
and the processor corrects the ADC and the DAC according to the correction parameters.
Preferably, the processor further includes, after correcting the ADC and the DAC according to the correction parameter: and controlling the selection switch to enable the system to be in a control mode.
Preferably, said controlling said selector switch comprises automatically controlling said selector switch by said processor.
Preferably, the controlling the selection switch comprises manually controlling the selection switch.
Preferably, the digital input signal comprises a digital input signal preset by the processor.
A control system, comprising: the device comprises controlled equipment, a digital-to-analog conversion module DAC, an analog-to-digital conversion module ADC, a processor and a selection switch; wherein,
the output end of the processor is connected with the input end of the DAC, and the input end of the controller is connected with the output end of the ADC;
the selection switch is used for changing the connection state among the DAC, the ADC and the controlled equipment, so that the system is in a calibration mode or a control mode; wherein,
a first port of the selection switch is connected with the output end of the DAC, a second port of the selection switch is connected with the input end of the ADC, a third port of the selection switch is connected with the input end of the controlled device, and a fourth port of the selection switch is connected with the output end of the controlled device;
when the first port is connected with the second port, the first port is disconnected with the third port, and the second port is disconnected with the fourth port, the system is in a calibration mode; when the first port is disconnected from the second port, the first port is connected with the third port, and the second port is connected with the fourth port, the system is in a control mode;
preferably, the selection switch comprises a switch for switching between a calibration mode and a control mode under the control of the processor.
Preferably, the selection switch comprises a toggle switch for switching between the calibration mode and the control mode by manual operation.
According to the technical scheme, the analog-to-digital conversion and digital-to-analog conversion self-calibration method provided by the invention has the advantages that the control system is set to be in the calibration mode by using the selection switch, namely, the analog quantity output end of the DAC is only directly connected with the analog quantity input end of the ADC, so that the analog quantity output signal Ui1 of the DAC is used as the analog quantity input signal Ui2 of the ADC and forms a loop together with the processor; under the control of the processor, a digital input signal Data1 is sequentially converted by a DAC and an ADC to obtain an actual output value Data2, the processor collects and records the values of Data1 and Data2, calculates a theoretical output value Data2 'according to the Data1, a reference voltage Uref1 of the DAC and a reference voltage Uref2 of the ADC, obtains a correction parameter value by comparing and analyzing the Data1, the Data2 and the Data 2', and corrects the DAC and the ADC according to the correction parameter. In the self-calibration method, the conversion control of the DAC and the ADC and the recording and processing of Data such as Data1, Data2 and Data 2' are all completed by the processor without the help of equipment such as an oscilloscope and the like and the intervention of an operator, so that the workload of the operator is reduced, and the working efficiency of system calibration is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art control system having both a DAC and an ADC;
FIG. 2 is a flow chart of a method of self-calibration of analog-to-digital conversion and digital-to-analog conversion according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a control system applying the self-calibration method shown in FIG. 2 according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of another control system applying the self-calibration method shown in FIG. 2 according to an embodiment of the present invention;
fig. 5 is a schematic diagram of another control system applying the self-calibration method shown in fig. 2 according to an embodiment of the present invention.
Detailed Description
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 is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides an analog-to-digital conversion and digital-to-analog conversion self-calibration method, which is applied to a control system, and referring to fig. 3, the system comprises a processor 101, a digital-to-analog conversion module DAC102, an analog-to-digital conversion module ADC103, a controlled device 104 and a selection switch 105; wherein,
the digital signal output end of the processor 101 is connected with the input end of the DAC102, and the input end of the controller 101 is connected with the output end of the ADC 103;
the selection switch 105 is used for changing the connection state between the DAC102, the ADC103 and the controlled device 104, so that the system is in a calibration mode or a control mode; wherein,
a first port of the selection switch 105 is connected with the output end of the DAC102, a second port of the selection switch 105 is connected with the input end of the AD103C, a third port of the selection switch 105 is connected with the input end of the controlled device 104, and a fourth port of the selection switch 105 is connected with the output end of the controlled device 104;
when the first port of the selection switch 105 is connected with the second port of the selection switch 105, the first port of the selection switch 105 is disconnected with the third port of the selection switch 105, and the second port of the selection switch 105 is disconnected with the fourth port of the selection switch 105, the system is in a calibration mode; when the first port of the selection switch 105 is disconnected from the second port of the selection switch 105, the first port of the selection switch 105 is connected to the third port of the selection switch 105, and the second port of the selection switch 105 is connected to the fourth port of the selection switch 105, the system is in the control mode.
Referring to fig. 2 and 3, an analog-to-digital conversion and digital-to-analog conversion self-calibration method provided by the embodiment of the present invention at least includes the steps of:
s1: the system is powered on, and the selection switch 105 is controlled to enable the system to be in a calibration mode;
as can be seen from the connection relationship between the ports of the selection switch 105, in the calibration mode, the analog output signal Ui1 of the DAC102 is not input to the controlled device 104, but is directly input to the ADC103 as Ui 2.
S2: the processor 101 inputs a digital quantity input signal into the DAC102, controls the DAC and the ADC to sequentially perform signal conversion, and outputs an actual digital quantity output signal through the ADC;
the processor inputs a digital quantity input signal Data1 for calibration into the DAC102 and sends a control signal BUS1 to the DAC102, the DAC102 is controlled to convert the digital quantity input signal Data1 into a corresponding analog quantity output signal Ui1 to be output, and Ui1 is input into the ADC103 as an analog quantity input signal Ui2 of the ADC 103;
the processor 101 sends a control signal BUS2 to the ADC103, and the ADC103 is controlled to convert the analog quantity signal Ui2 into a digital quantity signal, namely an actual digital quantity output signal Data 2.
S3: the processor 101 collects and correspondingly records a digital input signal Data1 and an actual digital output signal Data 2;
s4: the processor 101 calculates a theoretical digital output signal Data 2' according to the digital input signal Data1, the reference voltage Uref1 of the DAC and the reference voltage Uref2 of the ADC;
as is known, the conversion formula of DAC is D1/Uref1 ═ Data1/Ui1, the conversion formula of ADC is Uref2/D2 ═ Ui2/Data2(D1 is the maximum input value of DAC, D2 is the maximum output value of ADC, D1 and D2 are known as basic parameters of DAC and ADC), the reference voltage relationship between DAC and ADC is Uref1 ═ K × Uref2, and Ui1 ═ Ui2 in the calibration mode, so the processor can calculate the theoretical output value Data2 ═ Data1 ═ K2/D1 corresponding to the digital quantity input signal Data 1.
S5: the processor 101 analyzes the digital input signal Data1, the actual digital output signal Data2 and the theoretical digital output signal Data 2' to obtain the correction parameters of the ADC103 and the DAC 102;
s6: the processor 101 corrects the ADC103 and DAC102 according to the correction parameters.
It should be noted that the labeling of the above steps by using S1-S6 does not strictly limit the execution sequence of the embodiment of the method, but only a preferred sequence, and those skilled in the art can obtain other embodiments of execution sequences without creative efforts, and all of them belong to the protection scope of the present invention.
From the above method, it is known that in the analog-to-digital conversion and digital-to-analog conversion self-calibration method provided in the embodiment of the present invention, the control system is set to the calibration mode by using the selection switch, that is, the analog output signal Ui1 of the DAC is used as the analog input signal Ui2 of the ADC, and forms a loop together with the processor; under the control of the processor, Data1 is sequentially converted by DAC and ADC to obtain actual output value Data2, the processor collects and records the values of Data1 and Data2, calculates theoretical output value Data2 'according to Data1 and K (or Uref1 and Uref2), obtains correction parameter values by comparing and analyzing Data1, Data2 and Data 2', and corrects the DAC and the ADC according to the correction parameters. In the self-calibration method, the conversion control of the DAC and the ADC and the recording and processing of Data such as Data1, Data2 and Data 2' are all completed by the processor without the help of equipment such as an oscilloscope and the like and the intervention of an operator, so that the workload of the operator is reduced, and the working efficiency of system calibration is improved.
In addition, according to the self-calibration method provided by the embodiment of the invention, the analog quantity output signal of the DAC is used as the analog quantity input signal of the ADC, and the processor, the DAC and the ADC form a calibration loop, so that the integral calibration of the DAC and the ADC is realized. Compared with the existing single calibration mode, the embodiment of the invention can quickly and conveniently finish calibration, greatly improve the working efficiency, and simultaneously avoid the ideal processing of data in the single calibration mode, thereby reducing the calibration error and improving the calibration precision.
In the traditional calibration mode, in order to reduce workload, the chips of the same model or batch are often corrected by adopting the same correction parameters, so that the self error of the DAC or ADC chip is introduced, and the calibration precision is reduced. The self-calibration method provided by the embodiment of the invention can quickly and conveniently calibrate the DAC and the ADC which are used by the system, so that the whole calibration can be carried out on each ADC and DAC which are currently applied by the system on the premise of hardly increasing the workload, and the calibration precision is improved.
In other embodiments of the present invention, the above embodiment further includes, after step S6, the steps of:
and controlling the selector switch to enable the system to be in a control mode.
After the calibration operation is completed, the system can be adjusted to the control mode through the selection switch 105, that is, the controlled device 104 is connected in series between the output end of the DAC102 and the input end of the ADC103, and the analog quantity output signal Ui1 of the DAC102 is not directly input to the ADC103 as Ui2, but is input to the controlled device as Ui3, so as to control the operation of the controlled device 104; the Ui3 is converted into the output of Ui4 after being acted by the controlled equipment, and is input into the ADC103 as Ui 2. It can be seen that the selection switch 105 enables flexible switching of the system between the calibration mode and the control mode.
In other embodiments of the present invention, the control selection switch described in all the above embodiments includes the selection switch 105 being automatically controlled or manually controlled by a processor.
In all the above embodiments of the present invention, the digital input signal in step S2 specifically includes: the digital quantity signal for calibration is set in advance in the processor 101 according to the control ranges of the DAC102 and the ADC 103.
In addition, the embodiment of the invention also provides a control system, and the system can realize self calibration of the system by applying the method.
Referring to fig. 3, the system includes a controlled device 104, a digital-to-analog conversion module DAC102, an analog-to-digital conversion module ADC103, a processor 101, and a selection switch 105; wherein,
the digital signal output end of the processor 101 is connected with the input end of the DAC102, and the input end of the processor 101 is connected with the output end of the ADC 103;
the selection switch 105 is used for changing the connection state between the DAC102, the ADC103 and the controlled device 104, so that the system is in a calibration mode or a control mode; wherein,
a first port of the selection switch 105 is connected with the output end of the DAC102, a second port of the selection switch 105 is connected with the input end of the AD103C, a third port of the selection switch 105 is connected with the input end of the controlled device 104, and a fourth port of the selection switch 105 is connected with the output end of the controlled device 104;
when the first port of the selection switch 105 is connected with the second port of the selection switch 105, the first port of the selection switch 105 is disconnected with the third port of the selection switch 105, and the second port of the selection switch 105 is disconnected with the fourth port of the selection switch 105, the system is in a calibration mode; when the first port of the selection switch 105 is disconnected from the second port of the selection switch 105, the first port of the selection switch 105 is connected to the third port of the selection switch 105, and the second port of the selection switch 105 is connected to the fourth port of the selection switch 105, the system is in the control mode.
As shown in fig. 4, the selection switch 105 is a selector switch 105a for switching the system between the calibration mode and the control mode by a control signal BUS3 of the processor.
In other embodiments of the present invention, as shown in fig. 5, the function of the selector switch described in the above embodiments can also be implemented by a toggle switch 105b that is manually operated to switch the system between the calibration mode and the control mode.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A self-calibration method for analog-to-digital conversion and digital-to-analog conversion is characterized in that based on a control system, the system comprises a processor, a digital-to-analog conversion module DAC, an analog-to-digital conversion module ADC, controlled equipment and a selection switch; wherein,
the output end of the processor is connected with the input end of the DAC, and the input end of the processor is connected with the output end of the ADC;
the selection switch is used for changing the connection state among the DAC, the ADC and the controlled equipment, so that the system is in a calibration mode or a control mode; wherein,
a first port of the selection switch is connected with the output end of the DAC, a second port of the selection switch is connected with the input end of the ADC, a third port of the selection switch is connected with the input end of the controlled device, and a fourth port of the selection switch is connected with the output end of the controlled device;
when the first port is connected with the second port, the first port is disconnected with the third port, and the second port is disconnected with the fourth port, the system is in a calibration mode; when the first port is disconnected from the second port, the first port is connected with the third port, and the second port is connected with the fourth port, the system is in a control mode;
the method comprises the following steps:
the system is powered on, and the selection switch is controlled to enable the system to be in a calibration mode;
the processor inputs a digital quantity input signal into the DAC, controls the DAC and the ADC to sequentially execute signal conversion, and outputs an actual digital quantity output signal through the ADC;
the processor collects and correspondingly records the digital quantity input signal and the actual digital quantity output signal;
the processor calculates a theoretical digital quantity output signal according to the digital quantity input signal, the reference voltage of the DAC and the reference voltage of the ADC;
the processor analyzes the digital quantity input signal, the actual digital quantity output signal and the theoretical digital quantity output signal to obtain correction parameters of the ADC and the DAC;
and the processor corrects the ADC and the DAC according to the correction parameters.
2. The method of claim 1, wherein the processor, after modifying the ADC and DAC according to the modification parameters, further comprises: and controlling the selection switch to enable the system to be in a control mode.
3. The method of claim 2, wherein the controlling the selector switch comprises automatically controlling the selector switch via the processor.
4. The method of claim 2, wherein the controlling the selector switch comprises manually controlling the selector switch.
5. The method according to any one of claims 1 to 4, wherein the digital quantity input signal comprises a digital quantity input signal for calibration previously set in the processor.
6. A control system, comprising: the device comprises controlled equipment, a digital-to-analog conversion module DAC, an analog-to-digital conversion module ADC, a processor and a selection switch; wherein,
the output end of the processor is connected with the input end of the DAC, and the input end of the processor is connected with the output end of the ADC;
the selection switch is used for changing the connection state among the DAC, the ADC and the controlled equipment, so that the system is in a calibration mode or a control mode; wherein,
a first port of the selection switch is connected with the output end of the DAC, a second port of the selection switch is connected with the input end of the ADC, a third port of the selection switch is connected with the input end of the controlled device, and a fourth port of the selection switch is connected with the output end of the controlled device;
when the first port is connected with the second port, the first port is disconnected with the third port, and the second port is disconnected with the fourth port, the system is in a calibration mode; when the first port is disconnected from the second port, the first port is connected with the third port, and the second port is connected with the fourth port, the system is in a control mode.
7. The control system of claim 6, wherein the selection switch comprises a toggle switch that switches between a calibration mode and a control mode under control of the processor.
8. The control system of claim 6, wherein the selection switch comprises a toggle switch that is manually operated to switch between the calibration mode and the control mode.
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| CN105824266A (en) * | 2015-01-04 | 2016-08-03 | 上海恩艾仪器有限公司 | High-density dynamic analog output card |
| CN105337615A (en) * | 2015-12-01 | 2016-02-17 | 深圳市思榕科技有限公司 | Method for generating high-accuracy DAC voltage |
| CN105607574A (en) * | 2016-02-04 | 2016-05-25 | 天津市英贝特航天科技有限公司 | Adaptive analog quantity calibrating device |
| CN105978636B (en) * | 2016-06-21 | 2019-02-22 | 珠海纳睿达科技有限公司 | Mutual calibration system and method for the double/multichannel DA/AD without basis of reference |
| CN111490786B (en) * | 2020-05-28 | 2023-12-29 | 上海金脉汽车电子有限公司 | Calibration method and device of digital-to-analog converter |
| CN113900006B (en) * | 2021-08-26 | 2024-10-11 | 湖南艾科诺维科技有限公司 | Chip fault testing device, system and method |
| CN117234193B (en) * | 2023-11-10 | 2024-03-01 | 浙江国利信安科技有限公司 | Calibration device for a control system |
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