CN115421548A - Voltage correction method and device - Google Patents
Voltage correction method and device Download PDFInfo
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- CN115421548A CN115421548A CN202211373421.XA CN202211373421A CN115421548A CN 115421548 A CN115421548 A CN 115421548A CN 202211373421 A CN202211373421 A CN 202211373421A CN 115421548 A CN115421548 A CN 115421548A
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- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
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Abstract
The invention discloses a voltage correction method and a device, wherein the method comprises the steps of correcting a feedback value of an AD chip used for collecting the voltage of a load end in a load feedback circuit, and avoiding jump voltage caused by charging of an electrolytic capacitor at the output end of a power supply as a sampling value to participate in the calculation of the AD correction function through a jump time avoiding algorithm in the sampling process of the calculation of the AD correction function so as to improve the accuracy of the AD correction function and further improve the precision of the feedback value after the AD chip collects the voltage of the load end.
Description
Technical Field
The invention relates to the technical field of display screen detection equipment, in particular to a voltage correction method and device for improving no-load voltage and load voltage supply accuracy of an output end of point screen equipment.
Background
After the display screen is manufactured, a display screen manufacturer needs to perform screen dot detection on the screen to judge whether the screen is qualified. In the dot screen detection, the dot screen device needs to supply a driving voltage to the display screen so that the screen is lighted. On one hand, the problems of errors, system noise, aging of devices and the like of electronic components exist in the dot screen equipment; on the other hand, when the point screen device is connected with the screen and starts to detect, because the transmission lines on the display screen and the line have internal resistance, the voltage supplied to the display screen can be reduced, and further, a larger error exists between the actual output voltage value and the theoretical output voltage value; due to the two reasons, the accuracy of the output voltage of the dot screen device is insufficient, and the screen cannot be lightened. In order to enable the dot screen equipment to provide an ideal voltage value when detecting screens of different models, dot screen equipment manufacturers can correct the output voltage of the dot screen equipment before shipment so as to meet the requirements of users.
There are generally two methods for current voltage correction schemes:
1. digital correction, namely, an AD chip (analog-to-digital conversion chip) in the dot screen device is used for acquiring voltage data (voltage at the output end of a power supply of the dot screen device) of a load (display screen), the acquired voltage data of the display screen is corrected by an algorithm (for example, multi-stage fitting correction disclosed in the 201610124865.8 patent), a voltage value to be compensated is calculated according to an acquired value of the AD chip and a voltage compensation function after correction, and then the voltage value to be compensated is configured into a DA chip (the DA chip is a digital-to-analog conversion chip and is used for providing a voltage value in cooperation with a BUCK circuit in the power supply device (power supply of the dot screen device), so that the required voltage is output by the power supply output end to compensate transmission loss between the power supply device and the load;
2. the correction is performed using hardware circuitry.
The use of hardware circuits for calibration requires additional circuitry and higher cost, so digital calibration methods are preferred.
Before the point screen device leaves a factory, a manufacturer can write a tested voltage correction function into a control chip (a single chip microcomputer or an FPGA (field programmable gate array) and the like), and when the point screen device works actually, load voltage data acquired by an AD (analog-to-digital) chip are corrected in real time through the voltage correction function, so that a voltage value needing to be compensated and calculated by a subsequent voltage compensation function is accurate. In practice, however, in obtaining the voltage correction function, the following problems arise:
and in the AD correction stage, the correction upper computer provides fitting potential (used for setting the voltage of the power supply output end of the point screen device) for the analog load through the control module, and the voltage correction function of the AD chip is calculated through the actual sampling feedback value and the ideal sampling feedback value of the AD chip. However, since the power output end of the panel lighting device is provided with an electrolytic capacitor (filtering and energy supplying functions) in the circuit for reducing noise and stabilizing output, when the fitting potential is reduced, for example, from 20V to 16V, and since the voltage on the line is reduced, the electrolytic capacitor at the voltage output end is charged (as can be seen from the relationship between the capacitor and the voltages at two ends, the capacitance of the capacitor is increased when the voltage at two ends of the capacitor is reduced), which causes a sudden jump of the voltage on the line, so that the voltage on the line is reduced a lot. This phenomenon also occurs when the voltage value changes from small to large, but when the voltage value rises, the electrolytic capacitor discharges, and the formed jump time interval is very narrow and may not be considered.
Meanwhile, the conventional voltage correction scheme only corrects the AD chip, the accuracy of voltage collection is improved, however, after the upper computer collects accurate collected voltage, the voltage delta V of the load needs to be compensated due to loss under the current accessed load through a voltage compensation function, and then a voltage value of the DA chip at the power output end is configured to compensate the output voltage so that the load can work normally.
Disclosure of Invention
The invention aims to provide a voltage correction method and a voltage correction device, which are beneficial to improving the no-load voltage of the output end of a dot screen device and the supply accuracy of load voltage.
In order to achieve the purpose, the invention adopts the following technical scheme:
a voltage correction method is applied to a load feedback circuit of a dot screen device and comprises the following steps: correcting a feedback value of an AD chip used for acquiring a load end voltage in a load feedback circuit;
the correcting the feedback value of the AD chip for acquiring the load terminal voltage in the load feedback circuit specifically includes:
the correction upper computer provides a plurality of groups of first fitting potentials to the analog load end, wherein the first fitting potentials are voltage signals which are ordered in a descending manner;
the control module controls the AD chip to sample the voltage of the analog load terminal under each first fitting potential to obtain a first sampling value, and controls the AD chip to sample through a jump time avoidance algorithm when the first fitting potentials are switched so as to prevent the AD chip from taking jump voltage caused by charging of an electrolytic capacitor at the output end of the power supply as the first sampling value;
correcting the upper computer control table to sample the voltage of the analog load terminal under each first fitting potential to obtain a second sampling value, and controlling the table to sample through a jump time avoidance algorithm when the first fitting potentials are switched so as to prevent the table from taking jump voltage caused by charging of an electrolytic capacitor at the output end of the power supply as the second sampling value;
the correction upper computer carries out multi-section fitting calculation according to the received first sampling value and the received second sampling value to obtain an AD correction function, the AD correction function is sent to the control module to be stored, and the control module corrects a feedback value of the AD chip through the AD correction function.
The jump time avoiding algorithm comprises the steps that before a feedback value of an AD chip used for collecting the voltage of a load end in a load feedback circuit is corrected, a correction upper computer calculates jump time and sends the jump time to a control module for storage, when a first fitting potential is switched, the control module controls the AD chip to sample after delaying the jump time, and a control table to sample after the correction upper computer delays the jump time;
the jump time t is calculated by the following formula obtained according to the charging characteristic of the electrolytic capacitor at the power output end of the point screen device:
wherein t is the jump time, C is the maximum capacitance of the electrolytic capacitor at the power output terminal, R is the internal resistance of the power supply, E is the initial value of the voltage at the power output terminal, V f Is the peak jump value of the voltage at the power supply output end.
As a further improved technical scheme, the jump time avoidance algorithm comprises the steps of controlling an AD chip and a station table to respectively carry out multiple sampling when a first fitting potential is switched, sequencing a first sampling value and a second sampling value obtained by the multiple sampling according to the size sequence, and selecting the sampling values arranged in the middle to output to a correction upper computer.
As a further improved technical solution of the present invention, the AD correction function obtained by the upper correction computer performing multi-segment fitting calculation according to the received first sampling value and the second sampling value is:
wherein, V 1 Is an ideal feedback value, V, of the AD chip AD C and d are correction coefficients;
by taking at least two groups of first sampling values as V AD And a second sample value at the same first fitting potential as V 1 And substituting the correction coefficients into the AD correction function to calculate correction coefficients c and d.
As a further improved technical solution of the present invention, before the "correcting the feedback value of the AD chip for acquiring the load end voltage in the load feedback circuit", the method further includes correcting the output value of the DA chip for configuring the power output end voltage in the load feedback circuit;
the correcting the output value of the DA chip for configuring the voltage at the power output terminal in the load feedback circuit specifically includes:
the correction upper computer provides a plurality of groups of second fitting potentials to the control module, the second fitting potentials are voltage signals which are ordered in an increasing or decreasing mode, and the control module controls the DA chip to configure the voltage of the power output end according to the second fitting potentials;
correcting the voltage of the output end of the power supply by the upper computer console table under each second fitting potential to obtain a third sampling value;
and the correction upper computer performs multi-section fitting calculation according to the second fitting potential and the received third sampling value to obtain a DA correction function, and sends the DA correction function to the control module for storage, and the control module corrects the output value of the DA chip through the DA correction function.
As a further improved technical scheme of the present invention, the DA correction function obtained by the correction upper computer performing multi-stage fitting calculation according to the second fitting potential and the received third sampling value is:
wherein, V DA Is an ideal output voltage, V, of the power supply output terminal 2 A and b are correction coefficients, wherein the actual output voltage of the power supply output end is the actual output voltage;
by taking at least two sets of second fitting potentials as V DA And a third sample value at the same second fitting potential as V 2 And substituting the correction coefficients into the DA correction function to calculate correction coefficients a and b.
A voltage correction device is used for correcting a feedback value of an AD chip in a load feedback circuit of a dot screen device, wherein the AD chip is used for collecting a load end voltage of the dot screen device;
the voltage correction device comprises a correction upper computer, a control module and a table meter;
the voltage correction device is used for correcting a feedback value of an AD chip in a load feedback circuit of the point screen equipment, and specifically comprises the following steps:
the correction upper computer is used for providing a plurality of groups of first fitting potentials to the analog load end, and the first fitting potentials are voltage signals which are ordered in a descending manner;
the control module is used for controlling the AD chip to sample the voltage of the analog load terminal under each first fitting potential to obtain a first sampling value, and controlling the AD chip to sample through a jump time avoiding algorithm when the first fitting potentials are switched so as to prevent the AD chip from taking jump voltage caused by charging of an electrolytic capacitor at the output end of the power supply as the first sampling value;
the correction upper computer is also used for sampling the voltage of the analog load end by the console table under each first fitting potential to obtain a second sampling value, and controlling the console table to sample by a jump time avoiding algorithm when the first fitting potentials are switched so as to prevent the console table from taking jump voltage caused by charging of an electrolytic capacitor at the output end of the power supply as the second sampling value;
the correction upper computer is also used for carrying out multi-section fitting calculation according to the received first sampling value and the second sampling value to obtain an AD correction function, and sending the AD correction function to the control module for storage, and the control module corrects the feedback value of the AD chip through the AD correction function.
As a further improved technical scheme of the invention, the voltage correction device is also used for operating a jump time avoidance algorithm;
before correcting a feedback value of an AD chip used for collecting the voltage of a load end in a load feedback circuit, a correction upper computer calculates the hopping time and sends the hopping time to a control module for storage, when a first fitting potential is switched, the control module controls the AD chip to sample after delaying the hopping time, and controls a console to sample after correcting the upper computer delays the hopping time;
the jump time t is calculated by the following formula obtained according to the charging characteristic of the electrolytic capacitor at the power output end of the point screen device:
wherein t is the jump time, C is the maximum capacitance of the electrolytic capacitor at the power output end, R is the internal resistance of the power supply, E is the initial value of the voltage at the power output end, and V is the maximum capacitance of the electrolytic capacitor at the power output end f Is the jump peak value of the voltage at the power output end.
As a further improved technical scheme of the invention, the voltage correction device is also used for operating a jump time avoidance algorithm;
and the jump time avoidance algorithm comprises the steps of controlling the AD chip and the table to respectively carry out multiple sampling when the first fitting potential is switched, sequencing a first sampling value and a second sampling value obtained by the multiple sampling according to the magnitude sequence, and selecting the sampling values arranged in the middle to output to the correction upper computer.
As a further improved technical solution of the present invention, before the voltage correction device is used to correct the feedback value of the AD chip in the load feedback circuit of the dot panel device, the voltage correction device is also used to correct the output value of the DA chip in the load feedback circuit, which is used to configure the voltage at the output terminal of the power supply;
the voltage correction device is further used for correcting an output value of a DA chip which is used for configuring voltage of a power supply output end in the load feedback circuit, and specifically comprises the following steps:
the correction upper computer is also used for providing a plurality of groups of second fitting potentials to the control module, the second fitting potentials are voltage signals which are ordered in an increasing or decreasing mode, and the control module controls the DA chip to configure the voltage of the power output end according to the second fitting potentials;
the correction upper computer is also used for sampling the voltage of the power supply output end by the console table under each second fitting potential to obtain a third sampling value;
the correction upper computer is also used for carrying out multi-section fitting calculation according to the second fitting potential and the received third sampling value to obtain a DA correction function, the DA correction function is sent to the control module to be stored, and the control module corrects the output value of the DA chip through the DA correction function.
Compared with the prior art, the invention has the technical effects that:
the voltage correction method provided by the invention comprises the steps of correcting a feedback value of an AD chip used for collecting the voltage of a load terminal in a load feedback circuit, avoiding the jump voltage caused by charging of an electrolytic capacitor at the output end of a power supply as a sampling value to participate in the calculation of the AD correction function through a jump time avoidance algorithm in the sampling process of the calculation of the AD correction function so as to improve the accuracy of the AD correction function, and further improving the precision of the feedback value after the AD chip collects the voltage of the load terminal.
Drawings
Fig. 1 is a schematic flow chart illustrating an implementation of a voltage calibration method in embodiment 1 of the present invention;
fig. 2 is a schematic flow chart illustrating an implementation of the voltage correction method in embodiment 2 of the present invention;
FIG. 3 is a block diagram schematically illustrating the structure of a voltage correction apparatus in embodiment 3 of the present invention;
FIG. 4 is a block diagram schematically illustrating the structure of a voltage correction apparatus in embodiment 4 of the present invention;
fig. 5 is an actual view of a voltage transition waveform displayed by an oscilloscope.
Detailed Description
The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes in accordance with the embodiments are within the scope of the present invention.
It should be noted that, the present invention only relates to the technical solution of improving the sampling feedback accuracy of the AD chip and the output accuracy of the DA chip, and does not relate to the calculation of the compensation voltage. And subsequently, the user of the point screen device calculates the voltage which needs to be compensated for the load due to loss under the currently connected load (display screen) through a voltage compensation function. The invention aims to enable the calculated compensation voltage to be more accurate by improving the sampling feedback precision of the AD chip, and enable the compensation voltage to be accurately configured to the power output end by improving the output precision of the DA chip, thereby helping to improve the no-load voltage and the load voltage supply precision of the output end of the point screen device.
Example 1
Referring to fig. 1, a voltage correction method is applied to a load feedback circuit of a dot screen device, and is used for correcting a feedback value of an AD chip in the load feedback circuit, which is used for acquiring a voltage at a load terminal, so as to improve sampling feedback accuracy of the AD chip, and correcting an output value of a DA chip in the load feedback circuit, which is used for configuring a voltage at a power output terminal, so as to improve accuracy of an output voltage of the DA chip.
The voltage correction method in this embodiment is implemented by the following procedure:
the method comprises the steps of defining a first fitting potential range and a second fitting potential range according to the distribution condition of driving voltage of common display screens in the market, so that the defining range of the first fitting potential range and the second fitting potential range can cover the distribution range of the driving voltage of the common display screens, for example, the driving voltage of the common display screens is distributed between 24V and 12V, a point screen device may need to test any display screen with the driving voltage distributed between 24V and 12V in practical application, the driving voltage output by the point screen device in the range needs to be ensured to be accurate, the fitting potential range is correspondingly selected between 24V and 12V, and an AD chip and a DA chip are corrected in the fitting potential range.
And because the outputs of the AD chip and the DA chip are nonlinearly changed when the fitting potential range is changed, the AD chip and the DA chip are corrected by adopting a multi-section fitting mode, the fitting potential range is divided into a plurality of groups of fitting potentials in the multi-section fitting process, the fitting potential range is divided into a plurality of sections by the plurality of groups of fitting potentials, theoretically, the outputs of the AD chip and the DA chip in each small section of fitting potential range can be regarded as linearly changed as long as the number of the divided sections is enough, namely, a linear corresponding relation exists between an ideal output value and an actual output value of the AD chip and the DA chip, and the linear corresponding relation can be embodied by a correction function shown below. And calculating correction coefficients between the ideal output values and the actual output values of the AD chip and the DA chip in each fitting potential range by sampling the ideal output values and the actual output values of the AD chip and the DA chip in each fitting potential range and substituting the ideal output values and the actual output values into a linear equation, so that a correction function between the ideal output values and the actual output values of the AD chip and the DA chip in each fitting potential range can be obtained. In actual use, the feedback value of the AD chip and the output value of the DA chip can be corrected through the correction function in the corresponding voltage range.
Actually, for convenience of operation of personnel and reduction of calculation amount, in the process of dividing the fitting potential range into a plurality of groups of fitting potentials, the fitting potential range can be firstly divided into a plurality of sub-fitting potential ranges according to the distribution condition of the driving voltage of various display screens, two optional point positions in each sub-fitting potential range form a plurality of groups of fitting potentials, and then the calculation of a correction function is carried out.
For example, the driving voltage of a common display screen is distributed between 24 and 12V, wherein the driving voltage of a large display screen is distributed between 24 and 17V, and the driving voltage of a small display screen is distributed between 17 and 12V, any two potentials between 24 and 17V and 17 and 12V are taken to form a plurality of sets of fitting potentials for voltage correction, and if 22V, 20V, 16V and 14V are taken, a correction function between 22 and 20V is taken as a correction function between 24 and 17V, and a correction function between 16 and 14V is taken as a correction function between 17 and 12V. When the correction function is used, the feedback value of the AD chip and the output value of the DA chip are corrected by adopting the correction function between 22V and 20V if the driving voltage of the display screen is between 24V and 17V, the feedback value of the AD chip and the output value of the DA chip are corrected by adopting the correction function between 16V and 14V if the driving voltage of the display screen is between 17V and 12V, and the correction functions between 24V to 22V, 20V to 17V, 17V to 16V and 14V to 12V can be not calculated.
Referring to fig. 5, fig. 5 is a diagram showing an oscilloscope displaying a voltage jump waveform, wherein the abscissa represents time and the ordinate represents voltage. In order to reduce noise, stabilize output and the like, the power output end of the point screen device is provided with an electrolytic capacitor (filtering and energy supplying functions) in a circuit, and voltage jump can be caused during the switching of the fitting potential according to the corresponding relation between the capacitance value of the electrolytic capacitor and the voltage. In the sampling process of the AD correction function calculation, jump time avoidance algorithm is adopted to avoid the jump voltage caused by charging of the electrolytic capacitor at the output end of the power supply as a sampling value to participate in the AD correction function calculation so as to improve the accuracy of the AD correction function. And no-load correction is adopted in the DA chip correction process (no load is added to the power output end, namely no current is generated), the electrolytic capacitor has no charging and discharging process, and jump voltage which influences the DA correction function calculation cannot be generated.
By taking the selected 22V, 20V, 16V and 14V as examples of the four sets of first fitting potentials, the first fitting potential is switched from 22V to 20V, from 20V to 16V, and from 16V to 14V in sequence, and a jump voltage is generated.
In the embodiment, the jumping voltage is avoided from being acquired by pre-calculating the jumping time during each switching and then performing time-delay sampling.
Before correcting a feedback value of an AD chip used for acquiring the voltage of the output end of the power supply in a load feedback circuit, a correction upper computer calculates the jump time and sends the jump time to a control module for storage, when the first fitting potential is switched, the control module controls the AD chip to sample after delaying the jump time, and the control platform samples after the correction upper computer delays the jump time;
the jump time t is calculated by the following formula obtained according to the charging characteristic of an electrolytic capacitor at the power output end of the point screen device:
wherein t is the jump time, C is the maximum capacitance of the electrolytic capacitor at the power output end, R is the internal resistance of the power supply, E is the initial value of the voltage at the power output end, and V is the maximum capacitance of the electrolytic capacitor at the power output end f Is the jump peak value of the voltage at the output end of the power supply, and Ln represents the natural logarithm.
It should be noted that R and C in each point screen device are constants, E is an initial value of the voltage at the power output end at each time of first fitting potential switching, the value E is sampled and sent to the correction upper computer by the table, and V f Is the jump peak value of the power supply output end voltage at each first fitting potential switching, V f The values are sampled and sent to a correction upper computer by an oscilloscope, and the correction upper computer passes through all groups of E and V f The value can calculate the jump time of each first fitting potential switching.
The specific process that the jump time t is obtained according to the charging characteristic of the electrolytic capacitor at the power output end of the point screen device is as follows:
v is provided 0 For initiation on electrolytic capacitorsValue of voltage, V u For full-charge of the electrolytic capacitor with a terminal voltage value, V t At an arbitrary time t 1 Voltage value, C, across the electrolytic capacitor t For a voltage value V at any moment t The capacitance value of the lower electrolytic capacitor can be according to V t And calculating the electrolytic capacitance parameter.
If the battery with voltage E is charged to the electrolytic capacitor with initial value of 0 through the resistor R, V 0 =0, charging limit V u = E, therefore, at any time t 1 The voltage across the electrolytic capacitor is:
when V is t Is equal to V f And (5) ending the time hopping, and further obtaining a hopping time calculation formula:
according to the relation characteristic of the electrolytic capacitor and the voltage at two ends (the voltage at the output end of the power supply), the smaller the voltage at two ends of the electrolytic capacitor is, the larger the capacitance of the electrolytic capacitor is, and the V is generated in the process of voltage jump t In the process of change, the voltage value V is correspondingly and randomly t Capacitance C of lower electrolytic capacitor t Also varied, C t The value is difficult to obtain, so C is added t The maximum capacitance value C of the electrolytic capacitor at the power supply output terminal is set. The value of t thus calculated will be greater than C t And substituting the t value calculated by the formula, and sampling after time delay can be used for avoiding the jump voltage during each switching.
And after the jump time corresponding to the first fitting potential is calculated, DA chip correction and AD chip correction are sequentially carried out.
First, DA chip calibration is performed.
And starting the point screen device to enable the point screen device to be in an idle state (no load is added at the power output end, namely no current is generated), and connecting the table meter to the power output end.
The correction upper computer provides a plurality of groups of second fitting potentials to the control module, the second fitting potentials are voltage signals which are ordered in an increasing or decreasing mode, and the control module controls the DA chip to configure the voltage of the power output end according to the second fitting potentials;
correcting the voltage of the output end of the power supply by the upper computer console table under each second fitting potential to obtain a third sampling value;
and the correction upper computer performs multi-section fitting calculation according to the second fitting potential and the received third sampling value to obtain a DA correction function, and sends the DA correction function to the control module for storage, and the control module corrects the output value of the DA chip through the DA correction function.
The DA correction function obtained by the correction upper computer through multi-section fitting calculation according to the second fitting potential and the received third sampling value is as follows:
wherein, V DA Is an ideal output voltage, V, of the power supply output terminal 2 The actual output voltage of the power supply output end is shown, and a and b are correction coefficients;
by taking at least two sets of second fitting potentials as V DA And a third sample value at the same second fitting potential as V 2 And substituting the correction coefficients into the DA correction function to calculate correction coefficients a and b.
It should be noted that, when the DA chip is in an ideal working condition, the voltage output by the power output terminal should be equal to the second fitting potential configured by the calibration upper computer, so that the second fitting potential is taken as V DA And the third sampling value measured by the table connected to the power output end is the actual output voltage of the power output end under the corresponding second fitting potential. Because the fitting potential range is divided into a plurality of segments (one segment between two sets of second fitting potentials) by the plurality of sets of second fitting potentials, the actual output voltage at the power supply output terminal can be obtained in each segmentThe voltage is regarded as linearly changing according to the second fitting potential (ideal output voltage), so that the linear equation shown by the DA correction function can embody the linear corresponding relation between the actual output voltage and the ideal output voltage of the power supply output end. Two groups of second fitting potentials are taken as V DA And a third sample value at the same second fitting potential as V 2 And (5) substituting the correction coefficients a and b into the DA correction function to solve the equation set, and determining the DA correction function corresponding to the section of second fitting potential.
And respectively calculating correction coefficients corresponding to the second fitting potentials of all the sections, namely calculating DA correction functions corresponding to the second fitting potentials of all the sections, sending the DA correction functions to the control module for storage, and calling the corresponding DA correction functions to perform DA correction when voltage compensation is subsequently performed.
Then, AD chip correction is performed.
And starting the point screen equipment to enable the point screen equipment to be in a loaded state (the power output end is provided with an analog load, and the analog load is used for simulating display screens with various driving voltages), and connecting the table meter at two ends of the analog load.
The correction upper computer provides multiple groups of first fitting potentials for the analog load end, and the first fitting potentials are voltage signals which are ordered in a descending manner.
When the correction upper computer provides the first fitting potential to the analog load, after DA correction is performed on the first fitting potential through a corresponding DA correction function (the actual voltage of the voltage output end is made to be closer to the first fitting potential), the voltage of the power output end is configured through a DA chip and then output to the analog load;
the control module controls the AD chip to sample the voltage of the analog load terminal under each first fitting potential to obtain a first sampling value, and controls the AD chip to sample after delaying corresponding jump time when the first fitting potentials are switched, so that jump voltage caused by charging of an electrolytic capacitor at the output end of the power supply by the AD chip is prevented from being used as the first sampling value;
the upper computer control table is corrected to sample the voltage of the analog load terminal under each first fitting potential to obtain a second sampling value, and the table is controlled to sample after corresponding jump time is delayed when the first fitting potentials are switched, so that jump voltage caused by charging of an electrolytic capacitor at the output end of the power supply is prevented from being used as the second sampling value;
the correction upper computer carries out multi-section fitting calculation according to the received first sampling value and the received second sampling value to obtain an AD correction function, the AD correction function is sent to the control module to be stored, and the control module corrects a feedback value of the AD chip through the AD correction function.
The AD correction function obtained by the upper correction computer through multi-section fitting calculation according to the received first sampling value and the second sampling value is as follows:
wherein, V 1 Is an ideal feedback value, V, of the AD chip AD C and d are correction coefficients;
by taking at least two groups of first sampling values as V AD And a second sample value at the same first fitting potential as V 1 And substituting the correction coefficients into the AD correction function to calculate correction coefficients c and d.
When the AD chip is in an ideal working condition, the actual feedback value of the AD chip is equal to the voltage value of the analog load, so that a second sampling value acquired by a station meter directly connected to two ends of the analog load is used as the ideal feedback value of the AD chip. After the fitting potential range is divided into a plurality of small segments (one small segment is arranged between two groups of first fitting potentials) through a plurality of groups of first fitting potentials, in each small segment, the actual feedback value of the AD chip can be regarded as linearly changed according to the load voltage (ideal feedback value), so that the linear equation shown by the AD correction function can embody the linear corresponding relation between the ideal feedback value and the actual feedback value of the AD chip. Taking two groups of first sampling values as V AD And a second sample value at the same first fitting potential as V 1 And substituting the correction coefficients into the AD correction function to solve the equation set to obtain correction coefficients c and d, namely determining the AD correction function corresponding to the first fitting potential.
And respectively calculating correction coefficients corresponding to the first fitting potentials of the sections, namely calculating AD correction functions corresponding to the first fitting potentials of the sections, sending the AD correction functions to the control module for storage, calling the corresponding AD correction functions to perform AD correction when performing AD sampling subsequently, feeding back voltage values after AD correction, and participating in compensation voltage calculation.
Example 2
Referring to fig. 2, the difference between the present embodiment and embodiment 1 is that the jump time avoidance algorithm is different, and the rest is the same.
The jump time avoiding algorithm adopted in the embodiment does not need to calculate a specific jump time value, and the sampling values are screened in a mode of sorting and taking a median value after multiple times of sampling.
The jump time avoidance algorithm in the embodiment includes that when the first fitting potential is switched, the AD chip and the station table are controlled to respectively carry out multiple sampling, the first sampling value and the second sampling value obtained by the multiple sampling are respectively sorted according to the size sequence, and the sampling values arranged in the middle are selected and output to the correction upper computer.
For example, when the first fitting potential is switched, the AD chip and the table are controlled to respectively carry out 11 times of sampling, a first sampling value and a second sampling value obtained by 11 times of sampling are respectively sorted according to the size sequence, and the first sampling value and the second sampling value which are arranged at the 6 th position are selected and output to the correction upper computer.
Example 3
Referring to fig. 3, a voltage correction device is applied to a load feedback circuit of a dot screen device, and corrects a feedback value of an AD chip used for acquiring a voltage at a load terminal in the load feedback circuit, so as to improve sampling feedback accuracy of the AD chip, and corrects an output value of a DA chip used for configuring a voltage at a power output terminal in the load feedback circuit, so as to improve accuracy of an output voltage of the DA chip.
The voltage correction device comprises a correction upper computer, a control module, a station meter and an oscilloscope so as to operate a jump time avoidance algorithm.
The correction upper computer is an intelligent correction terminal which is externally arranged on the point screen device, such as a PC;
the table meter is a metering instrument which is externally arranged on the point screen equipment, such as a universal meter with a communication function;
the oscilloscope is arranged outside the point screen equipment and has a communication function;
the control module is a point screen equipment built-in module, such as a singlechip.
The correction upper computer is in communication connection with the control module to control the DA chip through the control module and configure voltage to the power output end.
When a jump time avoiding algorithm is operated, jump time is calculated, when the jump time is calculated, the acquisition ends of the station meter and the oscilloscope are connected to the output end of the power supply, and the feedback end of the station meter is in communication connection with the correction upper computer.
When the jump time is calculated, the correction upper computer configures a first fitting potential to the power output end, the table feeds back an initial value E of the power output end voltage to the correction upper computer, and the oscilloscope feeds back a jump peak value V of the power output end voltage to the correction upper computer f Correcting the upper computer according to each group of E and V f And calculating the jump time t of each first fitting potential switching by using the value.
The jump time t is calculated by the following formula obtained according to the charging characteristic of the electrolytic capacitor at the power output end of the point screen device:
wherein t is the jump time, C is the maximum capacitance of the electrolytic capacitor at the power output terminal, R is the internal resistance of the power supply, E is the initial value of the voltage at the power output terminal, V f Is the peak jump value of the voltage at the power supply output end.
And the correcting upper computer sends the calculated jump time to the control module for storage, in the AD correction process, when the first fitting potential is switched, the control module controls an AD chip to sample after delaying the corresponding jump time, and the correcting upper computer controls a console to sample after delaying the corresponding jump time.
The voltage correction device is also used for correcting the output value of the DA chip which is used for configuring the voltage of the power supply output end in the load feedback circuit.
When the output value of the DA chip is corrected, the correction upper computer controls the DA chip to configure a second fitting potential to the no-load power output end through the control module, and the table meter is connected to the power output end so as to collect a third sampling value representing the actual output voltage of the power output end under the control of the correction upper computer and feed the third sampling value back to the correction upper computer.
And the correction upper computer performs multi-section fitting calculation according to the second fitting potential stored by the correction upper computer and the received third sampling value to obtain a DA correction function, and sends the DA correction function to the control module for storage, so that the control module can correct the output value of the DA chip through the DA correction function.
The voltage correction device is also used for correcting a feedback value of an AD chip in a load feedback circuit of the point screen equipment, and the AD chip is used for collecting the load end voltage of the point screen equipment.
When the feedback value of the AD chip is corrected, a first fitting potential is provided for the analog load through the correction upper computer. Specifically, the correction upper computer sends the first fitting potential to the control module, and the control module performs DA correction on the first fitting potential through a corresponding DA correction function, configures the voltage of the power output end through a DA chip, and then outputs the voltage to the analog load.
The platform table is connected at the load end to the second sampling value of gathering the ideal feedback value of representative AD chip is fed back to and is rectified host computer, and the AD chip is also connected at the load end to gather the first sampling value of representing the actual feedback value of AD chip, and feed back first sampling value to through control module to rectify host computer.
In the process of acquiring the first and second sampling values.
The control module controls the AD chip to sample the voltage of the analog load under each first fitting potential to obtain a first sampling value, and controls the AD chip to sample after delaying the jump time when the first fitting potentials are switched, so that the AD chip is prevented from taking jump voltage caused by charging of an electrolytic capacitor at the output end of the power supply as the first sampling value;
and the correction upper computer console table samples the voltage of the analog load terminal under each first fitting potential to obtain a second sampling value, and delays the jumping time and then samples the console table when the first fitting potentials are switched so as to prevent the table from taking the jumping voltage caused by charging the electrolytic capacitor at the power output end as the second sampling value.
The correction upper computer carries out multi-section fitting calculation according to the received first sampling value and the received second sampling value to obtain an AD correction function, and sends the AD correction function to the control module for storage, so that the control module can correct the feedback value of the AD chip through the AD correction function.
Example 4
Referring to fig. 4, the difference between the present embodiment and embodiment 3 is that the jump time avoidance algorithm operated by the voltage correction device is different, and the rest is the same.
In the embodiment, the jump time avoiding algorithm operated by the voltage correction device does not need to calculate a specific jump time value, and the sampling values are screened in a mode of sorting and taking a median value after multiple times of sampling.
Because the jump time does not need to be calculated in the embodiment, an oscilloscope is omitted, and the software stored in the control module and the correction upper computer is used for carrying out multiple sampling, sequencing and screening of the first sampling value and the second sampling value.
Specifically, when the first fitting potential is switched, the AD chip and the table are controlled to respectively carry out multiple sampling, the first sampling value and the second sampling value obtained by the multiple sampling are respectively sorted according to the size sequence, and the sampling values arranged in the middle are selected and output to the correction upper computer.
For example, when the first fitting potential is switched, the AD chip and the table are controlled to respectively carry out 11 times of sampling, a first sampling value and a second sampling value obtained by 11 times of sampling are respectively sorted according to the size sequence, and the first sampling value and the second sampling value which are arranged at the 6 th position are selected and output to the correction upper computer.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may be modified or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A voltage correction method is applied to a load feedback circuit of a dot screen device, and is characterized by comprising the following steps: correcting a feedback value of an AD chip used for collecting the voltage of a load end in a load feedback circuit;
the correcting the feedback value of the AD chip for acquiring the load terminal voltage in the load feedback circuit specifically includes:
the correction upper computer provides a plurality of groups of first fitting potentials to the analog load end, wherein the first fitting potentials are voltage signals which are ordered in a descending manner;
the control module controls the AD chip to sample the voltage of the analog load terminal under each first fitting potential to obtain a first sampling value, and controls the AD chip to sample through a jump time avoidance algorithm when the first fitting potentials are switched so as to prevent the AD chip from taking jump voltage caused by charging of an electrolytic capacitor at the output end of the power supply as the first sampling value;
correcting the upper computer control table to sample the voltage of the analog load terminal under each first fitting potential to obtain a second sampling value, and controlling the table to sample through a jump time avoidance algorithm when the first fitting potentials are switched so as to prevent the table from taking jump voltage caused by charging of an electrolytic capacitor at the output end of the power supply as the second sampling value;
the correction upper computer performs multi-section fitting calculation according to the received first sampling value and the received second sampling value to obtain an AD correction function, the AD correction function is sent to the control module to be stored, and the control module corrects a feedback value of the AD chip through the AD correction function.
2. The voltage correction method according to claim 1, wherein the jump time avoidance algorithm includes that before correcting a feedback value of an AD chip used for acquiring a load terminal voltage in a load feedback circuit, a correction upper computer calculates jump time and sends the jump time to a control module for storage, when a first fitting potential is switched, the control module controls the AD chip to sample after delaying the jump time, and controls a console to sample after delaying the jump time;
the jump time t is calculated by the following formula obtained according to the charging characteristic of an electrolytic capacitor at the power output end of the point screen device:
wherein t is the jump time, C is the maximum capacitance of the electrolytic capacitor at the power output terminal, R is the internal resistance of the power supply, E is the initial value of the voltage at the power output terminal, V f Is the jump peak value of the voltage at the power output end.
3. The voltage correction method according to claim 1, wherein the jump time avoidance algorithm includes controlling an AD chip and a station table to respectively perform multiple sampling during switching of the first fitting potential, sorting first sampling values and second sampling values obtained by the multiple sampling according to a size sequence, and selecting the middle-ranked sampling values to output to the correction upper computer.
4. The voltage correction method according to claim 1, wherein the AD correction function obtained by the correction upper computer performing multi-segment fitting calculation according to the received first sample value and the second sample value is:
wherein, V 1 Is an ideal feedback value, V, of the AD chip AD C and d are correction coefficients;
by taking at least two groups of first sampling values as V AD And a second sample value at the same first fitting potential as V 1 And substituting the correction coefficients into the AD correction function to calculate correction coefficients c and d.
5. The voltage correction method of claim 1, wherein before correcting the feedback value of the AD chip for acquiring the voltage at the load end in the load feedback circuit, the method further comprises correcting the output value of the DA chip for configuring the voltage at the power output end in the load feedback circuit;
the correcting the output value of the DA chip for configuring the voltage at the power output terminal in the load feedback circuit specifically includes:
the correction upper computer provides a plurality of groups of second fitting potentials to the control module, the second fitting potentials are voltage signals which are ordered in an increasing or decreasing mode, and the control module controls the DA chip to configure the voltage of the power output end according to the second fitting potentials;
correcting the voltage of the output end of the power supply by the upper computer console table under each second fitting potential to obtain a third sampling value;
and the correction upper computer performs multi-section fitting calculation according to the second fitting potential and the received third sampling value to obtain a DA correction function, and sends the DA correction function to the control module for storage, and the control module corrects the output value of the DA chip through the DA correction function.
6. The voltage correction method according to claim 5, wherein the DA correction function obtained by the correction upper computer performing multi-stage fitting calculation according to the second fitting potential and the received third sampling value is:
wherein, V DA Is an ideal output voltage, V, of the power supply output terminal 2 A and b are correction coefficients, wherein the actual output voltage of the power supply output end is the actual output voltage;
by taking at least two sets of second fitting potentials as V DA And a third sample value at the same second fitting potential as V 2 And substituting the correction coefficients into the DA correction function to calculate correction coefficients a and b.
7. A voltage correction device is characterized in that the voltage correction device is used for correcting a feedback value of an AD chip in a load feedback circuit of a dot screen device, and the AD chip is used for collecting the load end voltage of the dot screen device;
the voltage correction device comprises a correction upper computer, a control module and a table meter;
the voltage correction device is used for correcting a feedback value of an AD chip in a load feedback circuit of the point screen equipment, and specifically comprises the following steps:
the correction upper computer is used for providing a plurality of groups of first fitting potentials to the analog load end, and the first fitting potentials are voltage signals which are ordered in a descending manner;
the control module is used for controlling the AD chip to sample the voltage of the analog load terminal under each first fitting potential to obtain a first sampling value, and controlling the AD chip to sample through a jump time avoiding algorithm when the first fitting potentials are switched so as to prevent the AD chip from taking jump voltage caused by charging of an electrolytic capacitor at the output end of the power supply as the first sampling value;
the correction upper computer is also used for sampling the voltage of the analog load end by the console table under each first fitting potential to obtain a second sampling value, and controlling the console table to sample by a jump time avoiding algorithm when the first fitting potentials are switched so as to prevent the console table from taking jump voltage caused by charging of an electrolytic capacitor at the output end of the power supply as the second sampling value;
the correction upper computer is also used for carrying out multi-section fitting calculation according to the received first sampling value and the second sampling value to obtain an AD correction function, and sending the AD correction function to the control module for storage, and the control module corrects the feedback value of the AD chip through the AD correction function.
8. The voltage correction device of claim 7, wherein the voltage correction device is further configured to run a jump time avoidance algorithm;
before correcting a feedback value of an AD chip used for acquiring the voltage of a load end in a load feedback circuit, a correction upper computer calculates the jump time and sends the jump time to a control module for storage, when a first fitting potential is switched, the control module controls the AD chip to sample after delaying the jump time, and controls a console to sample after correcting the upper computer;
the jump time t is calculated by the following formula obtained according to the charging characteristic of the electrolytic capacitor at the power output end of the point screen device:
wherein t is the jump time, C is the maximum capacitance of the electrolytic capacitor at the power output terminal, R is the internal resistance of the power supply, E is the initial value of the voltage at the power output terminal, V f Is the jump peak value of the voltage at the power output end.
9. The voltage correction device of claim 7, wherein the voltage correction device is further configured to run a jump time avoidance algorithm;
the jump time avoidance algorithm comprises the steps that when the first fitting potential is switched, the AD chip and the station table are controlled to conduct sampling for multiple times respectively, the first sampling value and the second sampling value obtained through the sampling for multiple times are sorted according to the size sequence, and the sampling values arranged in the middle are selected and output to the correction upper computer.
10. The voltage correction device of claim 7, wherein the voltage correction device is configured to correct an output value of a DA chip for configuring a voltage at the output terminal of the power supply in the load feedback circuit before correcting a feedback value of an AD chip in the load feedback circuit of the pointing device;
the voltage correction device is further used for correcting an output value of a DA chip used for configuring a voltage of a power output terminal in the load feedback circuit, and specifically includes:
the correction upper computer is also used for providing a plurality of groups of second fitting potentials to the control module, the second fitting potentials are voltage signals which are ordered in an increasing or decreasing mode, and the control module controls the DA chip to configure the voltage of the power output end according to the second fitting potentials;
the correction upper computer is also used for sampling the voltage of the power supply output end by the console table under each second fitting potential to obtain a third sampling value;
the correction upper computer is also used for carrying out multi-section fitting calculation according to the second fitting potential and the received third sampling value to obtain a DA correction function, the DA correction function is sent to the control module to be stored, and the control module corrects the output value of the DA chip through the DA correction function.
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| CN1474509A (en) * | 2002-08-09 | 2004-02-11 | 华为技术有限公司 | Method for smoothly change-over of main and spare clock for synchronous digital transmission equipment |
| CN106452225A (en) * | 2016-09-27 | 2017-02-22 | 山东大学 | Real-time correction system and method for commutation phase of sensorless brushless DC motor |
| CN109581376A (en) * | 2018-12-26 | 2019-04-05 | 北京遥测技术研究所 | A kind of VCO frequency sweep non-linear correction method for safety check imaging |
| CN111257628A (en) * | 2020-03-05 | 2020-06-09 | 成都飞机工业（集团）有限责任公司 | Anti-interference method for converting alternating current signal into pulse signal |
| CN111585567A (en) * | 2020-01-03 | 2020-08-25 | 石家庄数英仪器有限公司 | Rapid tracking synchronous sampling system with frequency holding function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1474509A (en) * | 2002-08-09 | 2004-02-11 | 华为技术有限公司 | Method for smoothly change-over of main and spare clock for synchronous digital transmission equipment |
| CN106452225A (en) * | 2016-09-27 | 2017-02-22 | 山东大学 | Real-time correction system and method for commutation phase of sensorless brushless DC motor |
| CN109581376A (en) * | 2018-12-26 | 2019-04-05 | 北京遥测技术研究所 | A kind of VCO frequency sweep non-linear correction method for safety check imaging |
| CN111585567A (en) * | 2020-01-03 | 2020-08-25 | 石家庄数英仪器有限公司 | Rapid tracking synchronous sampling system with frequency holding function |
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