CN113055014B - Analog-digital conversion method, analog-digital converter and micro-control system - Google Patents
Analog-digital conversion method, analog-digital converter and micro-control system Download PDFInfo
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- CN113055014B CN113055014B CN202110265881.XA CN202110265881A CN113055014B CN 113055014 B CN113055014 B CN 113055014B CN 202110265881 A CN202110265881 A CN 202110265881A CN 113055014 B CN113055014 B CN 113055014B
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- H03M1/12—Analogue/digital converters
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Abstract
The invention provides an analog-to-digital conversion method, an analog-to-digital converter and a micro-control system, wherein the analog-to-digital conversion method comprises the following steps: directly converting the analog signal into a digital voltage value by an analog-to-digital converter; and the main controller acquires the digital voltage value and carries out system response according to the digital voltage value. The analog-to-digital converter directly converts the analog signal into the digital voltage value, so that the main controller can directly acquire the digital voltage value for operation, the computing power of the main controller is relieved, and the computing speed is improved.
Description
Technical Field
The present invention relates to the field of analog-to-digital converters, and in particular, to an analog-to-digital conversion method, an analog-to-digital converter, and a micro control system.
Background
In the era of smart interconnection of everything, the application of a microcontroller chip is in the aspects of automotive electronics, aerospace, industrial and agricultural and daily life, and the like, and the ADC (analog-to-digital conversion) of the chip is used in most applications.
In the existing ADC application, an analog signal outside or inside an ADC acquisition chip is generally converted into a digital signal (bit data) with a certain number of bits, the converted digital signal is converted into a digital voltage value convenient for people to recognize through calculation, and finally, the digital voltage value is used as a parameter to participate in corresponding operation and then a system response is performed.
However, in this method, after the digital signal is obtained after the ADC conversion, the digital bit signal is converted into the digital voltage through software calculation, which not only takes much time but also occupies much resources of the chip, and this is more obvious when the number of AD conversion channels is more and the conversion rate is higher.
Thus, the prior art has yet to be improved and enhanced.
Disclosure of Invention
In view of the above-mentioned shortcomings in the prior art, an object of the present invention is to provide an analog-to-digital conversion method, an analog-to-digital converter and a micro control system, in which an analog signal is directly converted into a digital voltage value by the analog-to-digital converter, so that a master controller can directly obtain the digital voltage value for operation, thereby relieving the computational power of the master controller and improving the computational rate.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an analog-to-digital conversion method, which comprises the following steps:
collecting an internal or external analog signal by an analog-to-digital converter, and converting the analog signal into bit data;
the bit data is converted into a digital voltage value through a logic circuit.
The method for directly converting the analog signal into the digital voltage value by the analog-to-digital converter specifically comprises the following steps:
and the main controller acquires the digital voltage value and carries out system response according to the digital voltage value.
The converting the bit data into a digital voltage value by the logic circuit specifically includes:
dividing the bit data by the maximum value of the numerical range of the bit data converted by the analog-to-digital converter by a logic circuit to obtain a quotient, wherein the bit data is a dividend;
and multiplying the quotient by the maximum value of the conversion voltage range of the analog-to-digital converter to obtain a digital voltage value.
The obtaining, by the master controller, the digital voltage value and performing a system response according to the digital voltage value specifically includes:
the main controller obtains a digital voltage value output by the analog-to-digital converter, and calculates the duty ratio of a PWM signal according to the digital voltage value to drive a motor, wherein the digital voltage value is a phase voltage value.
The obtaining, by the master controller, the digital voltage value and performing a system response according to the digital voltage value specifically includes:
the main controller obtains a digital voltage value output by the analog-to-digital converter, calculates the temperature of the chip according to the digital voltage value and outputs a temperature value, wherein the digital voltage value is a voltage value of the temperature sensor.
Based on the above analog-to-digital conversion method, the present invention further provides an analog-to-digital converter, which includes a converter body, wherein an analog-to-digital conversion module is disposed in the converter body, and the analog-to-digital conversion module includes:
the analog-to-digital conversion unit is used for acquiring external or internal analog signals and performing analog-to-digital conversion on the analog signals to obtain bit data;
the logic circuit is used for carrying out logic operation on the bit data to obtain a digital voltage value;
the analog-to-digital conversion unit is connected with the logic circuit, and the logic circuit is also connected with the master controller.
The logic circuit includes:
a divider connected to the analog-to-digital converter for dividing the bit data by a maximum value of a numerical range of the bit data converted by the analog-to-digital converter;
and the multiplier is connected with the divider and used for multiplying the quotient of the divider and the maximum value of the conversion voltage range of the analog-to-digital converter to obtain a digital voltage value.
Based on the analog-to-digital converter, the invention also provides a micro-control system, which comprises a master controller and the analog-to-digital converter, wherein the analog-to-digital converter directly converts an analog signal into a digital voltage value; and the main controller acquires the digital voltage value and carries out system response according to the digital voltage value.
When the micro control system is a motor driving chip, the main controller acquires a digital voltage value output by the analog-to-digital converter, and calculates the duty ratio of a PWM signal according to the digital voltage value to drive the motor.
When the micro control system is a temperature detection chip, the main controller acquires a digital voltage value output by the analog-to-digital converter, calculates the temperature of the chip according to the digital voltage value and outputs a temperature value.
Compared with the prior art, the analog-to-digital conversion method, the analog-to-digital converter and the micro-control system provided by the invention have the advantages that the analog-to-digital conversion method comprises the following steps: directly converting the analog signal into a digital voltage value by an analog-to-digital converter; and the main controller acquires the digital voltage value and carries out system response according to the digital voltage value. The analog-to-digital converter directly converts the analog signal into the digital voltage value, so that the main controller can directly acquire the digital voltage value for operation, the computing power of the main controller is relieved, and the computing speed is improved.
Drawings
FIG. 1 is a flow chart of an analog-to-digital conversion method provided by the present invention;
fig. 2 is a flowchart of the steps of the analog-to-digital conversion method S100 provided by the present invention;
fig. 3 is a flowchart of the steps of the analog-to-digital conversion method S120 provided by the present invention;
FIG. 4 is a flowchart of the steps of the analog-to-digital conversion method S210 according to the present invention;
FIG. 5 is a flowchart of the steps of the analog-to-digital conversion method S220 provided by the present invention;
fig. 6 is a block diagram of an analog-to-digital converter according to the present invention;
fig. 7 is a block diagram of a micro control system according to the present invention.
Detailed Description
The invention provides an analog-to-digital conversion method, an analog-to-digital converter and a micro-control system.
The embodiments of the present invention are intended to explain technical concepts of the present invention, technical problems to be solved, technical features constituting technical solutions, and technical effects to be brought about in more detail. The embodiments are not to be construed as limiting the maximum value of the scope of the present invention. Further, the technical features of the embodiments described below may be combined with each other as long as they do not conflict with each other.
For the convenience of understanding the embodiments of the present application, relevant elements related to the embodiments of the present application will be described first.
The ADC is an important peripheral function of the chip, all analog signals are converted into digital signals through the ADC, and the digital signals are used as references to enable equipment to make corresponding responses to realize the functions. The sampling rate of the ADC is the rate of analog-to-digital conversion, and the system requires the rate of analog-to-digital conversion for fast response, so the effective conversion rate of the ADC is a very important analog performance index.
In the prior art, after the digital signal is obtained after ADC conversion, the digital bit signal is converted into the digital voltage through software calculation, so that a lot of time is consumed, and a lot of resources of a chip are occupied. Therefore, it is necessary to provide a new technical solution to optimize the analog-to-digital conversion process of the chip.
In view of the above problems in the prior art, referring to fig. 1, the present invention provides an analog-to-digital conversion method, including:
s100, an analog-to-digital converter collects internal or external analog signals and converts the analog signals into bit data;
and S200, converting the bit data into a digital voltage value through a logic circuit.
Specifically, in this embodiment, the analog-to-digital converter is redesigned, the analog-to-digital conversion function is realized through the analog-to-digital converter, the digital voltage value is directly obtained and provided for the micro control chip to be calculated, and then the calculation process from the digital signal to the human-readable digital voltage value is eliminated from the software, so that the calculation power inside the micro control chip can be used in other places, and the calculation speed of the micro control chip is accelerated.
In this embodiment, the analog-to-digital converter collects an analog signal inside or outside the micro control chip, converts the analog signal into a digital signal, and converts the digital signal into a digital voltage value through a logic circuit in the simulator. The simulator of the embodiment realizes the conversion from the digital signal to the digital voltage value through hardware, so that the computational power resource of the micro-control chip is liberated, more data can be processed, and the computation speed is increased.
Specifically, referring to fig. 3, the step S200 specifically includes:
s210, dividing the bit data and the maximum value of the numerical range of the bit data converted by the analog-to-digital converter by a logic circuit to obtain a quotient, wherein the bit data is a dividend;
and S220, multiplying the quotient by the maximum value of the conversion voltage range of the analog-to-digital converter to obtain a digital voltage value.
In specific implementation, in this embodiment, a fixed hardware algorithm is set in the logic circuit, and only the digital signal needs to be accessed to the logic circuit, and after division operation, multiplication operation is performed to obtain a digital voltage value finally, where a divisor of the division operation is a maximum value of a numerical range of bit data converted by the analog-to-digital converter, a dividend is the bit data, and two multipliers of the multiplication operation are a quotient of the division operation and a maximum value of the conversion voltage range of the analog-to-digital converter, respectively. For example, the sampling range of the analog-to-digital converter is 0-4096 bits, and the conversion voltage range is 0-3.3V; when the analog-to-digital converter samples the chip internal analog signal or the chip external analog signal, the sampled bit value is 2048, and then the converted digital voltage value is obtained as follows: 2048/4096 × 3.3 ═ 1.65V. In the embodiment, the conversion process of the digital voltage value is converted to be calculated by the logic circuit in the analog-to-digital converter, so that the calculation resources of the main controller of the micro-control chip are liberated, more data can be processed, and the calculation speed is increased.
And S300, acquiring the digital voltage value by the main controller, and carrying out system response according to the digital voltage value.
In specific implementation, in this embodiment, the microcontroller further includes a main control chip, and after the analog-to-digital converter converts the analog signal into a digital voltage value, the digital voltage value is output to the main controller, and the main controller directly performs corresponding software algorithm calculation according to the digital voltage value, and finally performs system response according to a calculation result, so as to implement a corresponding system function.
The maximum value of the application range of the analog-to-digital converter is wide, and the analog-to-digital converter is applied to a plurality of fields, so that the analog-to-digital converter can be applied to micro-control chips with different functions and different types. The following embodiments are described by way of example and not limitation.
In an alternative embodiment, referring to fig. 4, the step S200 specifically includes:
and S310, the main controller acquires the digital voltage value output by the analog-to-digital converter and calculates the duty ratio of the PWM signal according to the digital voltage value to drive the motor, wherein the digital voltage value is a phase voltage value.
In specific implementation, in this embodiment, when the micro-control chip is a motor driving chip, the micro-control chip samples a phase current signal during rotation of the motor through the analog-to-digital converter, converts the phase current signal into bit data, and finally converts the bit data into a phase voltage signal (i.e., a digital voltage value) through a logic circuit in the analog-to-digital converter, and directly outputs the phase voltage signal to the main controller, and then the main controller calculates the phase voltage signal through a motor algorithm according to the phase voltage signal, and finally changes a duty ratio of PWM and outputs the phase voltage signal to the motor to drive the motor to work, so as to adjust a working state of the motor in real time.
In an alternative embodiment, referring to fig. 5, the step S200 specifically includes:
s320, the main controller obtains the digital voltage value output by the analog-to-digital converter, calculates the temperature of the chip according to the digital voltage value and outputs a temperature value, wherein the digital voltage value is the voltage value of the temperature sensor.
In specific implementation, in this embodiment, when the micro-control chip is a temperature detection chip, the analog voltage of the temperature sensor inside the chip is sampled by the analog-to-digital converter, the analog voltage is converted into bit data, the bit data is converted into a digital voltage value by the logic circuit in the analog-to-digital converter and is directly output to the main controller, and then the main controller calculates the current temperature according to the slope a and the calibration voltage value of 25 ℃. It should be noted that the specific temperature calculation formula and calculation process are the prior art and are not described herein again.
Based on the above analog-to-digital conversion method, please refer to fig. 6, the present invention further provides an analog-to-digital converter 100, which includes a converter body, wherein an analog-to-digital conversion module is disposed in the converter body, and the analog-to-digital conversion module includes: an analog-to-digital conversion unit 110 for acquiring an external or internal analog signal and performing analog-to-digital conversion on the analog signal to obtain bit data; a logic circuit 120 for performing a logic operation on the bit data to obtain a digital voltage value; the analog-to-digital conversion unit 110 is connected to the logic circuit 120, and the logic circuit 120 is further connected to a master 200.
In specific implementation, in this embodiment, the logic circuit 120 is added to the existing analog-to-digital converter 100, so that the analog-to-digital converter 100 can convert bit data into a digital voltage value, the master controller 200 of the micro control chip can directly obtain data required by final calculation, the calculation process of the master controller 200 is simplified, the calculation resources of the master controller 200 of the micro control chip are liberated, further more data can be processed, and the calculation speed is increased.
Specifically, the logic circuit 120 includes: a divider 121 connected to the analog-to-digital conversion unit 110 for dividing the bit data by the maximum value of the numerical range of the bit data converted by the analog-to-digital converter 100; and a multiplier 122 connected to the divider 121 and configured to multiply the quotient of the divider 121 with the maximum value of the conversion voltage range of the analog-to-digital converter 100 to obtain a digital voltage value.
In specific implementation, in this embodiment, the logic circuit 120 sequentially converts the bit data into a digital voltage value through the divider 121 and the multiplier 122, wherein a divisor in the divider 121 and a multiplier of the multiplier 122 are preset in the circuit, the bit data is input into the flip-flop as a dividend, a quotient of the flip-flop is input into the multiplier 122 as another multiplier, and finally the obtained digital voltage value is directly output to the master controller 200.
Based on the above analog-to-digital converter 100, please refer to fig. 7, the present invention further provides a micro control system 10, wherein the micro control system 10 includes a master 200 and the above analog-to-digital converter 100, and the analog-to-digital converter 100 directly converts an analog signal into a digital voltage value; the digital voltage value is obtained by the master controller 200, and the system response is carried out according to the digital voltage value. In this embodiment, the analog-to-digital converter 100 directly converts the analog signal into a digital voltage value, so that the master controller 200 can directly obtain the digital voltage value for operation, thereby relieving the computing power of the master controller 200 and improving the computing rate. Since the analog-to-digital converter 100 has been described in detail above, it is not described in detail here. It should be noted that the micro control system 10 may be a micro control chip, a micro control device, or a micro control device, and the like, as long as the technical solution related to the present invention is the micro control system 10 described in this embodiment.
Today, when the micro control system 10 is a motor driving chip, the master controller 200 obtains a digital voltage value output by the analog-to-digital converter 100, and calculates a duty ratio of a PWM signal according to the digital voltage value to drive the motor.
When the micro control chip is a motor driving chip, the micro control chip samples phase current signals in the motor rotation process through the analog-to-digital converter 100, converts the phase current signals into bit data, finally converts the bit data into phase voltage signals (namely digital voltage values) through the logic circuit 120 in the analog-to-digital converter 100, directly outputs the phase voltage signals into the main controller 200, calculates the phase voltage signals through a motor algorithm by the main controller 200, finally changes the duty ratio of PWM and outputs the PWM to the motor to drive the motor to work, and adjusts the working state of the motor in real time
Specifically, when the micro control system 10 is a temperature detection chip, the master controller 200 obtains a digital voltage value output by the analog-to-digital converter 100, calculates a chip temperature according to the digital voltage value, and outputs a temperature value.
When the micro control chip is a temperature detection chip, the analog voltage of the temperature sensor inside the chip is sampled by the analog-to-digital converter 100, the analog voltage is converted into bit data, finally the bit data is converted into a digital voltage value by the logic circuit 120 in the analog-to-digital converter 100 and is directly output to the main controller 200, and then the main controller 200 calculates the current temperature according to the slope a and the calibration voltage value of 25 ℃. The obtained temperature value is subsequently output to a display for display, or stored as a text or the like, and can be selected by the user according to the needs, which is not described in detail herein.
In summary, the present invention provides an analog-to-digital conversion method, an analog-to-digital converter and a micro control system, wherein the analog-to-digital conversion method includes: directly converting the analog signal into a digital voltage value by an analog-to-digital converter; and the main controller acquires the digital voltage value and carries out system response according to the digital voltage value. The analog-to-digital converter directly converts the analog signal into the digital voltage value, so that the main controller can directly acquire the digital voltage value for operation, the computing power of the main controller is relieved, and the computing speed is improved.
It should be understood that equivalents and modifications to the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the maximum protection scope of the appended claims.
Claims (7)
1. An analog-to-digital conversion method, comprising:
collecting an internal or external analog signal by an analog-to-digital converter, and converting the analog signal into bit data;
converting the bit data into a digital voltage value through a logic circuit in the analog-to-digital converter, and directly providing the digital voltage value to a main controller;
the main controller directly obtains the digital voltage value output by the logic circuit, and carries out the calculation of the corresponding software algorithm according to the digital voltage value, and carries out the system response according to the calculation result to realize the corresponding system function;
wherein, the converting the bit data into a digital voltage value by a logic circuit inside the analog-to-digital converter specifically includes: dividing the bit data and the maximum value of the numerical range of the bit data converted by the analog-to-digital converter by a logic circuit in the analog-to-digital converter to obtain a quotient, wherein the bit data is a dividend; multiplying the quotient by the maximum value of the conversion voltage range of the analog-to-digital converter to obtain a digital voltage value; the logic circuit inside the analog-to-digital converter comprises: the divider is connected with the analog-to-digital conversion unit and used for dividing the bit data by the maximum value of the numerical range of the bit data converted by the analog-to-digital converter; and the multiplier is connected with the divider and used for multiplying the quotient of the divider and the maximum value of the conversion voltage range of the analog-to-digital converter to obtain a digital voltage value.
2. The analog-to-digital conversion method according to claim 1, wherein the acquiring the digital voltage value by the master controller and performing a system response according to the digital voltage value specifically comprises:
the main controller obtains a digital voltage value output by the analog-to-digital converter, and calculates the duty ratio of a PWM signal according to the digital voltage value to drive a motor, wherein the digital voltage value is a phase voltage value.
3. The analog-to-digital conversion method according to claim 1, wherein the acquiring the digital voltage value by the master controller and performing a system response according to the digital voltage value specifically comprises:
the main controller obtains a digital voltage value output by the analog-to-digital converter, calculates the temperature of the chip according to the digital voltage value and outputs a temperature value, wherein the digital voltage value is a voltage value of the temperature sensor.
4. An analog-to-digital converter is characterized by comprising a converter body, wherein an analog-to-digital conversion module is arranged in the converter body, and the analog-to-digital conversion module comprises:
the analog-to-digital conversion unit is used for acquiring external or internal analog signals and performing analog-to-digital conversion on the analog signals to obtain bit data;
the logic circuit is arranged in the analog-to-digital converter and is used for carrying out logic operation on the bit data to obtain a digital voltage value;
the analog-to-digital conversion unit is connected with the logic circuit, and the logic circuit is also connected with the master controller;
wherein, the logic circuit inside the analog-to-digital converter comprises: the divider is connected with the analog-to-digital conversion unit and used for dividing the bit data by the maximum value of the numerical range of the bit data converted by the analog-to-digital converter; the multiplier is connected with the divider and used for multiplying the quotient of the divider and the maximum value of the conversion voltage range of the analog-to-digital converter to obtain a digital voltage value;
the logic circuit is also used for directly providing the digital voltage value to the main controller, the main controller directly obtains the digital voltage value output by the logic circuit, corresponding software algorithm calculation is carried out according to the digital voltage value, system response is carried out according to the calculation result, and corresponding system functions are realized.
5. A micro control system, comprising a chip body, wherein a master controller and the analog-to-digital converter of claim 4 are arranged in the chip body, and the analog-to-digital converter directly converts an analog signal into a digital voltage value; and the main controller acquires the digital voltage value and carries out system response according to the digital voltage value.
6. The micro-control system according to claim 5, wherein when the micro-control system is a motor driving chip, the master controller obtains a digital voltage value output by the analog-to-digital converter, and calculates a duty ratio of a PWM signal according to the digital voltage value to drive a motor.
7. The micro-control system according to claim 5, wherein when the micro-control system is a temperature detection chip, the master controller obtains a digital voltage value output by the analog-to-digital converter, calculates a chip temperature according to the digital voltage value, and outputs a temperature value.
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