CN104901537A - Air conditioner and analog-to-digital conversion correction auxiliary circuit of main controller of air conditioner - Google Patents
Air conditioner and analog-to-digital conversion correction auxiliary circuit of main controller of air conditioner Download PDFInfo
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Abstract
The invention belongs to the air conditioner electronic control technical field and provides an air conditioner and an analog-to-digital conversion correction auxiliary circuit of the main controller of the air conditioner. The analog-to-digital conversion correction auxiliary circuit provided by the invention includes a low-pass filtering unit, a switch tube, a voltage dividing filtering unit and a three-terminal controllable voltage stabilized source, wherein the low-pass filtering unit performs voltage division and low-pass filtering processing on electric level signals outputted by the main controller, and then outputs corresponding switch signals for controlling the on-off of the switch tube, and the voltage dividing filtering unit adjusts a voltage division coefficient correspondingly according to the on state or off state of the switch tube, and outputs corresponding correction voltage to the main controller according to the voltage of the reference voltage end of the three-terminal controllable voltage stabilized source; since the voltage of the reference voltage end of the three-terminal controllable voltage stabilized source is stable and constant, the outputted correction voltage is stable and has high accuracy, and therefore, the main controller can realize high-accuracy correction for an analog-to-digital conversion circuit.
Description
Technical field
The invention belongs to air conditioner electronic control technology field, the analog-to-digital conversion particularly relating to a kind of air conditioner and master controller thereof corrects auxiliary circuit.
Background technology
At present, air conditioner is controlled by the running status of master controller to air conditioner.Master controller includes analog to digital conversion circuit, the key parameter (as parameters such as the voltage and currents that outdoor environment temperature, complete machine run) that air conditioner samples at running by analog to digital conversion circuit is converted to digital quantity from analog quantity, and in the analog-to-digital process of execution, there is transformed error (comprising gain error and displacement errors) at analog to digital conversion circuit, if the digital quantity directly exported by analog to digital conversion circuit is applied to the control loop of master controller, then the control precision of system can reduce because of the impact of transformed error.In order to improve the conversion accuracy of analog to digital conversion circuit, then must correct its gain error and displacement errors.In actual application, in following linear relationship between the analog quantity X that analog to digital conversion circuit inputs and the digital quantity Y exported:
Y＝ma×X+b (1)
Wherein, ma and b is respectively gain and side-play amount.
Based on above-mentioned linear relationship, prior art adopts single channel to correct auxiliary circuit and corrects the analog to digital conversion circuit in master controller, the high level signal that switching tube in this single channel correcting circuit exports according to master controller or low level signal realize conducting or shutoff, thus make single channel correcting circuit after carrying out voltage division processing to supply voltage, export corresponding two correction voltages (respectively corresponding high level signal and low level signal) to master controller, these two correction voltages carry out obtaining two corresponding correction voltage digital quantities after analog-to-digital conversion through analog to digital conversion circuit by master controller again, and actual gain ma and the real offset b of analog to digital conversion circuit is obtained according to above-mentioned relation formula (1), and then just can complete correction to analog to digital conversion circuit according to actual gain ma and real offset b, thus make analog to digital conversion circuit carry out overcoming above-mentioned transformed error in analog-to-digital process.But, correct in auxiliary circuit at above-mentioned single channel, because correction voltage is directly proportional to supply voltage, if supply voltage changes, then correction voltage also can change thereupon, thus causes because correction voltage is unstable and make master controller cannot realize the problem of high-precision correction to analog to digital conversion circuit.
Summary of the invention
The object of the present invention is to provide a kind of analog-to-digital conversion of master controller to correct auxiliary circuit, be intended to solve making master controller cannot realize the problem of high-precision correction to analog to digital conversion circuit because correction voltage is unstable existing for prior art.
The present invention realizes like this, a kind of analog-to-digital conversion of master controller corrects auxiliary circuit, described master controller comprises analog to digital conversion circuit, and the correction voltage that described master controller exports according to described analog-to-digital conversion correction auxiliary circuit carries out transformed error correction to analog-digital conversion circuit as described;
Described analog-to-digital conversion corrects auxiliary circuit and comprises: low-pass filter unit, switching tube, divider filter unit and the controlled source of stable pressure of three ends;
The input of described low-pass filter unit connects the level output end of described master controller, the output of described low-pass filter unit connects the controlled end of described switching tube, the input of described switching tube connects the dividing potential drop control end of described divider filter unit, the input access supply voltage of described divider filter unit, the output of described divider filter unit and the negative electrode of the controlled source of stable pressure of described three end are connected to the correction voltage input of described master controller altogether, the reference voltage end of the controlled source of stable pressure of described three end connects the voltage stabilizing controlled end of described divider filter unit, the ground end of described low-pass filter unit and the output of described switching tube, the ground end of described divider filter unit and the anode of the controlled source of stable pressure of described three end are connected to ground altogether,
Described low-pass filter unit exports the break-make that corresponding switching signal controls described switching tube after carrying out dividing potential drop and low-pass filtering treatment to the level signal that described master controller exports; Described divider filter unit is according to the conducting of described switching tube or turn off corresponding adjustment dividing potential drop coefficient, and exports corresponding correction voltage to described master controller according to the voltage of the reference voltage end of the controlled source of stable pressure of described three end; Described correction voltage is greater than the voltage of the reference voltage end of the controlled source of stable pressure of described three end.
The analog-to-digital conversion that present invention also offers another kind of master controller corrects auxiliary circuit, described master controller comprises analog to digital conversion circuit, and the correction voltage that described master controller exports according to described analog-to-digital conversion correction auxiliary circuit carries out transformed error correction to analog-digital conversion circuit as described;
Described analog-to-digital conversion corrects auxiliary circuit and comprises: low-pass filter unit, switching tube, divider filter unit and the controlled source of stable pressure of three ends;
The input of described low-pass filter unit connects the level output end of described master controller, the output of described low-pass filter unit connects the controlled end of described switching tube, the input of described switching tube connects the dividing potential drop control end of described divider filter unit, the input of described divider filter unit connects supply voltage, the output of described divider filter unit connects the correction voltage input of described master controller, reference voltage end and the negative electrode of the controlled source of stable pressure of described three end are connected the first voltage stabilizing controlled end and the second voltage stabilizing controlled end of described divider filter unit respectively, the ground end of described low-pass filter unit and the output of described switching tube, the ground end of described divider filter unit and the anode of the controlled source of stable pressure of described three end are connected to ground altogether,
Described low-pass filter unit exports the break-make that corresponding switching signal controls described switching tube after carrying out dividing potential drop and low-pass filtering treatment to the level signal that described master controller exports; Described divider filter unit is according to the conducting of described switching tube or turn off corresponding adjustment dividing potential drop coefficient, and exports corresponding correction voltage to described master controller according to the voltage of the reference voltage end of the controlled source of stable pressure of described three end; Described correction voltage is less than the voltage of the reference voltage end of the controlled source of stable pressure of described three end.
Present invention also offers a kind of air conditioner, it comprises master controller and above-mentioned analog-to-digital conversion corrects auxiliary circuit.
The present invention corrects auxiliary circuit by adopting the analog-to-digital conversion comprising low-pass filter unit, switching tube, divider filter unit and the controlled source of stable pressure of three ends, exports the break-make of corresponding switching signal control switch pipe by low-pass filter unit to the level signal that master controller exports after carrying out dividing potential drop and low-pass filtering treatment; Divider filter unit is according to the conducting of switching tube or turn off corresponding adjustment dividing potential drop coefficient, and export corresponding correction voltage to master controller according to the voltage of the reference voltage end of the controlled source of stable pressure of three ends, because the voltage of the reference voltage end of the controlled source of stable pressure of three ends is stablized constant, therefore exported correction voltage is stable and precision is high, and then master controller can be made to realize high-precision correction to analog to digital conversion circuit.
Accompanying drawing explanation
Fig. 1 is the structure chart of the analog-to-digital conversion correction auxiliary circuit of the master controller that the embodiment of the present invention one provides;
Fig. 2 is the exemplary circuit structure chart that the analog-to-digital conversion shown in Fig. 1 corrects auxiliary circuit;
Fig. 3 is the structure chart of the analog-to-digital conversion correction auxiliary circuit of the master controller that the embodiment of the present invention two provides;
Fig. 4 is the exemplary circuit structure chart that the analog-to-digital conversion shown in Fig. 3 corrects auxiliary circuit;
To be the master controller that provides of the embodiment of the present invention correct by analog-to-digital conversion the realization flow figure that auxiliary circuit carries out correcting to Fig. 5.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The analog-to-digital conversion embodiments providing two kinds of master controllers corrects auxiliary circuit, is described in detail in conjunction with following specific embodiment:
embodiment one:
Fig. 1 shows the structure of the analog-to-digital conversion correction auxiliary circuit of the master controller that the embodiment of the present invention one provides, wherein, master controller 100 comprises analog to digital conversion circuit 101, and analog to digital conversion circuit 101 is converted to digital signal for the analog signal exported by analog signal sample circuit 102; The correction voltage that master controller 100 exports according to analog-to-digital conversion correction auxiliary circuit 200 carries out transformed error correction to analog to digital conversion circuit 101; For convenience of explanation, Fig. 1 illustrate only the part relevant to the embodiment of the present invention one, and details are as follows:
Analog-to-digital conversion corrects auxiliary circuit 200 and comprises: low-pass filter unit 201, switching tube 202, divider filter unit 203 and the controlled source of stable pressure IC1 of three ends.
The input of low-pass filter unit 201 connects the level output end P1 of master controller 100, the controlled end of the output connecting valve pipe 202 of low-pass filter unit 201, the input of switching tube 202 connects the dividing potential drop control end of divider filter unit 203, the input access supply voltage V of divider filter unit 203
dDthe negative electrode of the output of divider filter unit 203 and the controlled source of stable pressure IC1 of three ends is connected to the correction voltage input P2 of master controller 100 altogether, the reference voltage end of the controlled source of stable pressure IC1 of three ends connects the voltage stabilizing controlled end of divider filter unit 203, and the ground end of low-pass filter unit 201 and the output of switching tube 202, the ground end of divider filter unit 203 and the anode of the controlled source of stable pressure IC1 of three ends are connected to ground altogether.
The break-make of corresponding switching signal control switch pipe 202 is exported after the level signal that low-pass filter unit 201 pairs of master controllers 100 export carries out dividing potential drop and low-pass filtering treatment, divider filter unit 203 is according to the conducting of switching tube 202 or turn off corresponding adjustment dividing potential drop coefficient, and exporting corresponding correction voltage to master controller 100 according to the voltage of the reference voltage end of three ends controlled source of stable pressure IC1, this correction voltage is greater than the voltage of the reference voltage end of the controlled source of stable pressure IC1 of three ends.
Concrete, Fig. 2 shows the exemplary circuit structure of the analog-to-digital conversion correction auxiliary circuit of the master controller that the embodiment of the present invention one provides, and for convenience of explanation, illustrate only the part relevant to the embodiment of the present invention one, details are as follows:
Low-pass filter unit 201 comprises:
First resistance R1, the second resistance R2 and the first electric capacity C1;
The first end of the first resistance R1 is the input of low-pass filter unit 201, the common contact of the first end of second end of the first resistance R1 and the first end of the second resistance R2 and the first electric capacity C1 is the output of low-pass filter unit 201, and the common contact of second end of the second resistance R2 and second end of the first electric capacity C1 is the ground end of low-pass filter unit 201.
Switching tube 202 is specially NMOS tube Q1, and the grid of NMOS tube Q1, drain electrode and source electrode are respectively the controlled end of switching tube 202, input and output.
Divider filter unit 203 comprises:
3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and the second electric capacity C2;
The common contact of the first end of the 3rd resistance R3 and the first end of the 4th resistance R4 is the dividing potential drop control end of divider filter unit 203, the common contact of second end of the 4th resistance R4 and the first end of the 5th resistance R5 is the voltage stabilizing controlled end of divider filter unit 203, the common contact of second end of the 5th resistance R5 and the first end of the 6th resistance R6 is the output of divider filter unit 203, the common contact of second end of the 6th resistance R6 and the first end of the second electric capacity C2 is the input of divider filter unit 203, the common contact of second end of the second electric capacity C2 and second end of the 3rd resistance R3 is the ground end of divider filter unit 203.
The reference voltage stabilizing source of the controlled source of stable pressure IC1 of three ends can be specifically model be TL431.
Correct auxiliary circuit 200 below in conjunction with operation principle to above-mentioned analog-to-digital conversion to be described further:
The level output end P1 outputs level signals (high level or low level) of master controller 100 is to the first resistance R1, the low pass filter be made up of the first resistance R1, the second resistance R2 and the first electric capacity C1 carries out low-pass filtering treatment with filtering noise signal to this level signal, avoids NMOS tube Q1 to occur misleading.When level signal is high level, NMOS tube Q1 conducting, then the 3rd resistance R3 is shorted, and the correction voltage that divider filter unit 203 exports is the dividing potential drop on the 4th resistance R4 and the 5th resistance R5, and this correction voltage is now shown below:
Wherein, V
oNfor the correction voltage that divider filter unit 203 exports when NMOS tube Q1 conducting; V
refbe the voltage of the reference voltage end of the controlled source of stable pressure IC1 of three ends.
When level signal is low level, NMOS tube Q1 turns off, and the correction voltage that divider filter unit 203 exports is the dividing potential drop on the 3rd resistance R3, the 4th resistance R4 and the 5th resistance R5, and this correction voltage is now shown below:
Wherein, V
oFFfor the correction voltage that divider filter unit 203 exports when NMOS tube Q1 turns off.
Due to the voltage V of the reference voltage end of the controlled source of stable pressure IC1 of three ends
refchange not with loading condition and ambient temperature changes, so V
refstablize constant, there is accurate numerical value, therefore from the correction voltage V that above-mentioned relation formula (2) and (3) obtain
oNand V
oFFalso be stable, and be all greater than V
ref.
Concrete, for the first above-mentioned resistance R1 and the second resistance R2, both connect formation bleeder circuit, and the dividing potential drop on the second resistance R2 is as the gate source voltage of NMOS tube Q1.In actual applications, the resistance of the second resistance R2 is much larger than the resistance of the first resistance R1; First electric capacity C1 is connected in parallel between the grid source electrode of NMOS tube Q1 as high-frequency filter capacitor, and the capacitance of the first electric capacity C1 need much larger than the parasitic capacitance between the grid source electrode of NMOS tube Q1; Second electric capacity C2 is arranged in divider filter unit 203 as high-frequency filter capacitor, and its capacitance need much larger than the parasitic capacitance between the drain-source pole of NMOS tube Q1.The correction voltage that the resistance of the 3rd resistance R3, the 4th resistance R4 and the 5th resistance R5 is exported by the electric current on this branch road and divider filter unit 203 determines; The resistance of the 6th resistance R6 is determined by the operating current of the controlled source of stable pressure IC1 of three ends.
Wherein, the first resistance R1 can resistance be specifically the Chip-R of 100ohm, and the second resistance R2 can resistance be specifically the Chip-R of 10000ohm, and the first electric capacity C1 can capacitance be specifically 10
3the patch capacitor of pF; The N channel enhancement metal-oxide-semiconductor of NMOS tube Q1 to be model be STK7002; 3rd resistance R3 can resistance be specifically the Chip-R of 20000ohm, 4th resistance R4 can resistance be specifically the Chip-R of 1000ohm, 5th resistance R5 and the 6th resistance R6 can resistance be specifically the Chip-R of 20000ohm, and the second electric capacity C2 can capacitance be specifically 10
5the patch capacitor of pF; If the controlled source of stable pressure IC1 of three ends is model is the reference voltage stabilizing source of TL431, then V
reffor 2.5V, in order to provide bias current, supply voltage V to the controlled source of stable pressure IC1 of three ends and divider filter unit 203
dDv need be greater than
ref, so supply voltage V
dDcan value be specifically 3.3V.
When the parameter of above-mentioned each element is determined all, correction voltage (V
oNand V
oFF) numerical value just can determine according to above-mentioned relation formula (2) and (3), subsequently master controller 100 by analog to digital conversion circuit 101 by correction voltage (V
oNand V
oFF) change corresponding digital quantity value (V from analog value
oNcorresponding digital quantity value and V
oFFcorresponding digital quantity value), just can obtain actual gain ma and the real offset b of analog to digital conversion circuit 101 again according to relational expression (1), thus can correct accurately analog to digital conversion circuit 101 according to actual gain ma and real offset b.
embodiment two:
Fig. 3 shows the structure of the analog-to-digital conversion correction auxiliary circuit of the master controller that the embodiment of the present invention two provides, wherein, master controller 100 comprises analog to digital conversion circuit 101, and analog to digital conversion circuit 101 is converted to digital signal for the analog signal exported by analog signal sample circuit 102; The correction voltage that master controller 100 exports according to analog-to-digital conversion correction auxiliary circuit 200 carries out transformed error correction to analog to digital conversion circuit 101; For convenience of explanation, Fig. 3 illustrate only the part relevant to the embodiment of the present invention two, and details are as follows:
Analog-to-digital conversion corrects auxiliary circuit 200 and comprises: low-pass filter unit 201, switching tube 202, divider filter unit 203 and the controlled source of stable pressure IC1 of three ends.
The input of low-pass filter unit 201 connects the level output end P1 of master controller 100, the controlled end of the output connecting valve pipe 202 of low-pass filter unit 201, the input of switching tube 202 connects the dividing potential drop control end of divider filter unit 203, the input access supply voltage V of divider filter unit 203
dDthe output of divider filter unit 203 connects the correction voltage input P2 of master controller 100, reference voltage end and the negative electrode of the controlled source of stable pressure IC1 of three ends are connected the first voltage stabilizing controlled end and the second voltage stabilizing controlled end of divider filter unit 203 respectively, and the ground end of low-pass filter unit 201 and the output of switching tube 202, the ground end of divider filter unit 203 and the anode of the controlled source of stable pressure IC1 of three ends are connected to ground altogether.
The break-make of corresponding switching signal control switch pipe 202 is exported after the level signal that low-pass filter unit 201 pairs of master controllers 100 export carries out dividing potential drop and low-pass filtering treatment, divider filter unit 203 is according to the conducting of switching tube 202 or turn off corresponding adjustment dividing potential drop coefficient, and exporting corresponding correction voltage to master controller 100 according to the voltage of the reference voltage end of three ends controlled source of stable pressure IC1, this correction voltage is less than the voltage of the reference voltage end of the controlled source of stable pressure IC1 of three ends.
Concrete, Fig. 4 shows the exemplary circuit structure of the analog-to-digital conversion correction auxiliary circuit of the master controller that the embodiment of the present invention two provides, and for convenience of explanation, illustrate only the part relevant to the embodiment of the present invention two, details are as follows:
Low-pass filter unit 201 comprises:
First resistance R1, the second resistance R2 and the first electric capacity C1;
The first end of the first resistance R1 is the input of low-pass filter unit 201, the common contact of the first end of second end of the first resistance R1 and the first end of the second resistance R2 and the first electric capacity C1 is the output of low-pass filter unit 201, and the common contact of second end of the second resistance R2 and second end of the first electric capacity C1 is the ground end of low-pass filter unit 201.
Switching tube 202 is specially NMOS tube Q1, and the grid of NMOS tube Q1, drain electrode and source electrode are respectively the controlled end of switching tube 202, input and output.
Divider filter unit 203 comprises:
3rd resistance R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6, the 7th resistance R7 and the second electric capacity C2;
The common contact of the first end of the 3rd resistance R3 and the first end of the 4th resistance R4 is the dividing potential drop control end of divider filter unit 203, the common contact of second end of the 4th resistance R4 and the first end of the 5th resistance R5 is the output of divider filter unit 203, the common contact of second end of the 5th resistance R5 and the first end of the 6th resistance R6 is the first voltage stabilizing controlled end of divider filter unit 203, the common contact of second end of the 6th resistance R6 and the first end of the 7th resistance R7 is the second voltage stabilizing controlled end of divider filter unit 203, the common contact of second end of the 7th resistance R7 and the first end of the second electric capacity C2 is the input of divider filter unit 203, the common contact of second end of the second electric capacity C2 and second end of the 3rd resistance R3 is the ground end of divider filter unit 203.
The reference voltage stabilizing source of the controlled source of stable pressure IC1 of three ends can be specifically model be TL431.
Correct auxiliary circuit 200 below in conjunction with operation principle to above-mentioned analog-to-digital conversion to be described further:
The level output end P1 outputs level signals (high level or low level) of master controller 100 is to the first resistance R1, the low pass filter be made up of the first resistance R1, the second resistance R2 and the first electric capacity C1 carries out low-pass filtering treatment with filtering noise signal to this level signal, avoids NMOS tube Q1 to occur misleading.When level signal is high level, NMOS tube Q1 conducting, then the 3rd resistance R3 is shorted, and the correction voltage that divider filter unit 203 exports is the dividing potential drop on the 4th resistance R4, and this correction voltage is now shown below:
Wherein, V
oNfor the correction voltage that divider filter unit 203 exports when NMOS tube Q1 conducting; V
refbe the voltage of the reference voltage end of the controlled source of stable pressure IC1 of three ends.
When level signal is low level, NMOS tube Q1 turns off, and the correction voltage that divider filter unit 203 exports is the dividing potential drop on the 3rd resistance R3 and the 4th resistance R4, and this correction voltage is now shown below:
Wherein, V
oFFfor the correction voltage that divider filter unit 203 exports when NMOS tube Q1 turns off.
Due to the voltage V of the reference voltage end of the controlled source of stable pressure IC1 of three ends
refchange not with loading condition and ambient temperature changes, so V
refstablize constant, there is accurate numerical value, therefore from the correction voltage V that above-mentioned relation formula (4) and (5) obtain
oNand V
oFFalso be stable, and be all less than V
ref.
Concrete, for the first above-mentioned resistance R1 and the second resistance R2, both connect formation bleeder circuit, and the dividing potential drop on the second resistance R2 is as the gate source voltage of NMOS tube Q1.In actual applications, the resistance of the second resistance R2 is much larger than the resistance of the first resistance R1; First electric capacity C1 is connected in parallel between the grid source electrode of NMOS tube Q1 as high-frequency filter capacitor, and the capacitance of the first electric capacity C1 need much larger than the parasitic capacitance between the grid source electrode of NMOS tube Q1; Second electric capacity C2 is arranged in divider filter unit 203 as high-frequency filter capacitor, and its capacitance need much larger than the parasitic capacitance between the drain-source pole of NMOS tube Q1.The correction voltage that the resistance of the 3rd resistance R3, the 4th resistance R4, the 5th resistance R5 and the 6th resistance R6 is exported by the electric current on this branch road and divider filter unit 203 determines; The resistance of the 7th resistance R7 is determined by the operating current of the controlled source of stable pressure IC1 of three ends.
Wherein, the first resistance R1 can resistance be specifically the Chip-R of 100ohm, and the second resistance R2 can resistance be specifically the Chip-R of 10000ohm, and the first electric capacity C1 can capacitance be specifically 10
3the patch capacitor of pF; The N channel enhancement metal-oxide-semiconductor of NMOS tube Q1 to be model be STK7002; 3rd resistance R3 can resistance be specifically the Chip-R of 20000ohm, 4th resistance R4 can resistance be specifically the Chip-R of 1000ohm, 5th resistance R5, the 6th resistance R6 and the 7th resistance R7 can resistance be specifically the Chip-R of 20000ohm, and the second electric capacity C2 can capacitance be specifically 10
5the patch capacitor of pF; If the controlled source of stable pressure IC1 of three ends is model is the reference voltage stabilizing source of TL431, then V
reffor 2.5V, in order to provide bias current, supply voltage V to the controlled source of stable pressure IC1 of three ends and divider filter unit 203
dDv need be greater than
ref, so supply voltage V
dDcan value be specifically 3.3V.
When the parameter of above-mentioned each element is determined all, correction voltage (V
oNand V
oFF) numerical value just can determine according to above-mentioned relation formula (4) and (5), subsequently master controller 100 by analog to digital conversion circuit 101 by correction voltage (V
oNand V
oFF) change corresponding digital quantity value (V from analog value
oNcorresponding digital quantity value and V
oFFcorresponding digital quantity value), just can obtain actual gain ma and the real offset b of analog to digital conversion circuit 101 again according to relational expression (1), thus can correct accurately analog to digital conversion circuit 101 according to actual gain ma and real offset b.
The analog-to-digital conversion provided based on the embodiment of the present invention one and embodiment two corrects the good effect that auxiliary circuit 200 carries out for master controller 100 embodying in analog-to-digital conversion correction, the embodiment of the present invention additionally provides a kind of air conditioner, and it comprises master controller 100 and above-mentioned analog-to-digital conversion corrects auxiliary circuit 200.
Therefore, when after air-conditioner system electrification reset, master controller 100 first corrects auxiliary circuit 200 with analog-to-digital conversion and carries out communication, corrects the gain of the analog to digital conversion circuit 101 in master controller 100 and side-play amount.This process is concrete as shown in Figure 5, and details are as follows:
S1. master controller 100 exports high level by its level output end P1 and corrects auxiliary circuit 200 to analog-to-digital conversion;
S2. analog-to-digital conversion corrects auxiliary circuit 200 according to this high level output correction voltage V
oNto the correction voltage input P2 of master controller 100;
S3. the 101 couples of correction voltage V of the analog to digital conversion circuit in master controller 100
oNcorresponding digital quantity value Y is exported after carrying out analog-to-digital conversion electricity
oN;
S4. master controller 100 corrects auxiliary circuit 200 by its level output end P1 output low level to analog-to-digital conversion;
S5. analog-to-digital conversion corrects auxiliary circuit 200 according to this low level output correction voltage V
oFFto the correction voltage input P2 of master controller 100;
S6. the 101 couples of correction voltage V of the analog to digital conversion circuit in master controller 100
oFFcorresponding digital quantity value Y is exported after carrying out analog-to-digital conversion conversion
oFF;
S7. master controller 100 is according to correction voltage V
oNwith digital quantity value Y
oNwith correction voltage V
oFFwith digital quantity value Y
oFFthe gain of analog to digital conversion circuit 101 and side-play amount are corrected.
After correction completes, the analog signal that analog signal sample circuit 102 is sampled is converted to digital signal after analog to digital conversion circuit 101, and master controller 100 reads this digital signal and carries out detection and control to the operating state of air-conditioner system.
In sum, the embodiment of the present invention comprises low-pass filter unit 201 by employing, switching tube 202, the analog-to-digital conversion of divider filter unit 203 and the controlled source of stable pressure IC1 of three ends corrects auxiliary circuit 200, the break-make of corresponding switching signal control switch pipe 202 is exported after the level signal exported by low-pass filter unit 201 pairs of master controllers 100 carries out dividing potential drop and low-pass filtering treatment, divider filter unit 203 is according to the conducting of switching tube 202 or turn off corresponding adjustment dividing potential drop coefficient, and export corresponding correction voltage to master controller 100 according to the voltage of the reference voltage end of three ends controlled source of stable pressure IC1, because the voltage of the reference voltage end of three ends controlled source of stable pressure IC1 is stablized constant, therefore exported correction voltage is stable and precision is high, and then master controller 100 pairs of analog to digital conversion circuits 101 can be made to realize high-precision correction.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. the analog-to-digital conversion of master controller corrects an auxiliary circuit, and described master controller comprises analog to digital conversion circuit, and the correction voltage that described master controller exports according to described analog-to-digital conversion correction auxiliary circuit carries out transformed error correction to analog-digital conversion circuit as described; It is characterized in that, described analog-to-digital conversion corrects auxiliary circuit and comprises: low-pass filter unit, switching tube, divider filter unit and the controlled source of stable pressure of three ends;
The input of described low-pass filter unit connects the level output end of described master controller, the output of described low-pass filter unit connects the controlled end of described switching tube, the input of described switching tube connects the dividing potential drop control end of described divider filter unit, the input access supply voltage of described divider filter unit, the output of described divider filter unit and the negative electrode of the controlled source of stable pressure of described three end are connected to the correction voltage input of described master controller altogether, the reference voltage end of the controlled source of stable pressure of described three end connects the voltage stabilizing controlled end of described divider filter unit, the ground end of described low-pass filter unit and the output of described switching tube, the ground end of described divider filter unit and the anode of the controlled source of stable pressure of described three end are connected to ground altogether,
Described low-pass filter unit exports the break-make that corresponding switching signal controls described switching tube after carrying out dividing potential drop and low-pass filtering treatment to the level signal that described master controller exports; Described divider filter unit is according to the conducting of described switching tube or turn off corresponding adjustment dividing potential drop coefficient, and exports corresponding correction voltage to described master controller according to the voltage of the reference voltage end of the controlled source of stable pressure of described three end; Described correction voltage is greater than the voltage of the reference voltage end of the controlled source of stable pressure of described three end.
2. analog-to-digital conversion as claimed in claim 1 corrects auxiliary circuit, and it is characterized in that, described low-pass filter unit comprises:
First resistance, the second resistance and the first electric capacity;
The first end of described first resistance is the input of described low-pass filter unit, the common contact of the first end of the second end of described first resistance and the first end of described second resistance and described first electric capacity is the output of described low-pass filter unit, and the common contact of the second end of described second resistance and the second end of described first electric capacity is the ground end of described low-pass filter unit.
3. analog-to-digital conversion as claimed in claim 1 corrects auxiliary circuit, and it is characterized in that, described switching tube is NMOS tube, and the grid of described NMOS tube, drain electrode and source electrode are respectively the controlled end of described switching tube, input and output.
4. analog-to-digital conversion as claimed in claim 1 corrects auxiliary circuit, and it is characterized in that, described divider filter unit comprises:
3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance and the second electric capacity;
The common contact of the first end of described 3rd resistance and the first end of described 4th resistance is the dividing potential drop control end of described divider filter unit, the common contact of the second end of described 4th resistance and the first end of described 5th resistance is the voltage stabilizing controlled end of described divider filter unit, the common contact of the second end of described 5th resistance and the first end of described 6th resistance is the output of described divider filter unit, the common contact of the second end of described 6th resistance and the first end of described second electric capacity is the input of described divider filter unit, the common contact of the second end of described second electric capacity and the second end of described 3rd resistance is the ground end of described divider filter unit.
5. analog-to-digital conversion as claimed in claim 1 corrects auxiliary circuit, it is characterized in that, the reference voltage stabilizing source of the controlled source of stable pressure of described three end to be model be TL431.
6. an air conditioner, it comprises master controller, it is characterized in that, the analog-to-digital conversion that described air conditioner also comprises as described in any one of claim 1 to 5 corrects auxiliary circuit.
7. the analog-to-digital conversion of master controller corrects an auxiliary circuit, and described master controller comprises analog to digital conversion circuit, and the correction voltage that described master controller exports according to described analog-to-digital conversion correction auxiliary circuit carries out transformed error correction to analog-digital conversion circuit as described; It is characterized in that, described analog-to-digital conversion corrects auxiliary circuit and comprises: low-pass filter unit, switching tube, divider filter unit and the controlled source of stable pressure of three ends;
The input of described low-pass filter unit connects the level output end of described master controller, the output of described low-pass filter unit connects the controlled end of described switching tube, the input of described switching tube connects the dividing potential drop control end of described divider filter unit, the input of described divider filter unit connects supply voltage, the output of described divider filter unit connects the correction voltage input of described master controller, reference voltage end and the negative electrode of the controlled source of stable pressure of described three end are connected the first voltage stabilizing controlled end and the second voltage stabilizing controlled end of described divider filter unit respectively, the ground end of described low-pass filter unit and the output of described switching tube, the ground end of described divider filter unit and the anode of the controlled source of stable pressure of described three end are connected to ground altogether,
Described low-pass filter unit exports the break-make that corresponding switching signal controls described switching tube after carrying out dividing potential drop and low-pass filtering treatment to the level signal that described master controller exports; Described divider filter unit is according to the conducting of described switching tube or turn off corresponding adjustment dividing potential drop coefficient, and exports corresponding correction voltage to described master controller according to the voltage of the reference voltage end of the controlled source of stable pressure of described three end; Described correction voltage is less than the voltage of the reference voltage end of the controlled source of stable pressure of described three end.
8. analog-to-digital conversion as claimed in claim 7 corrects auxiliary circuit, and it is characterized in that, described low-pass filter unit comprises:
First resistance, the second resistance and the first electric capacity;
The first end of described first resistance is the input of described low-pass filter unit, the common contact of the first end of the second end of described first resistance and the first end of described second resistance and described first electric capacity is the output of described low-pass filter unit, and the common contact of the second end of described second resistance and the second end of described first electric capacity is the ground end of described low-pass filter unit.
9. analog-to-digital conversion as claimed in claim 7 corrects auxiliary circuit, and it is characterized in that, described switching tube is NMOS tube, and the grid of described NMOS tube, drain electrode and source electrode are respectively the controlled end of described switching tube, input and output.
10. analog-to-digital conversion as claimed in claim 7 corrects auxiliary circuit, and it is characterized in that, divider filter unit comprises:
3rd resistance, the 4th resistance, the 5th resistance, the 6th resistance, the 7th resistance and the second electric capacity;
The common contact of the first end of described 3rd resistance and the first end of described 4th resistance is the dividing potential drop control end of described divider filter unit, the common contact of the second end of described 4th resistance and the first end of described 5th resistance is the output of described divider filter unit, the common contact of the second end of described 5th resistance and the first end of described 6th resistance is the first voltage stabilizing controlled end of described divider filter unit, the common contact of the second end of described 6th resistance and the first end of described 7th resistance is the second voltage stabilizing controlled end of described divider filter unit, the common contact of the second end of described 7th resistance and the first end of described second electric capacity is the input of described divider filter unit, the common contact of the second end of described second electric capacity and the second end of described 3rd resistance is the ground end of described divider filter unit.
11. analog-to-digital conversion as claimed in claim 7 correct auxiliary circuits, it is characterized in that, the reference voltage stabilizing source of the controlled source of stable pressure of described three end to be model be TL431.
12. 1 kinds of air conditioners, it comprises master controller, it is characterized in that, the analog-to-digital conversion that described air conditioner also comprises as described in any one of claim 7 to 11 corrects auxiliary circuit.
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| CN201510284117.1A CN104901537B (en) | 2015-05-28 | 2015-05-28 | A kind of analog-to-digital conversion correction auxiliary circuit of air conditioner and its master controller |
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| CN104901537B CN104901537B (en) | 2018-01-16 |
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