CN104901537B - A kind of analog-to-digital conversion correction auxiliary circuit of air conditioner and its master controller - Google Patents
A kind of analog-to-digital conversion correction auxiliary circuit of air conditioner and its master controller Download PDFInfo
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Abstract
The invention belongs to air conditioner electronic control technology field, there is provided the analog-to-digital conversion correction auxiliary circuit of a kind of air conditioner and its master controller.The present invention corrects auxiliary circuit by using the analog-to-digital conversion including low-pass filter unit, switching tube, the controllable source of stable pressure of divider filter unit and three ends, and the break-make of corresponding switching signal controlling switch pipe is exported after the level signal progress partial pressure and low-pass filtering treatment that are exported by low-pass filter unit to master controller；Divider filter unit accordingly adjusts partial pressure coefficient according to the on or off of switching tube, and according to the corresponding correction voltage of voltage output of the reference voltage end of the controllable source of stable pressure in three ends to master controller, due to the voltage of the reference voltage end of the controllable source of stable pressure in three ends stablize it is constant, therefore the correction voltage exported is stable and precision is high, and then master controller can be made to realize high-precision correction to analog to digital conversion circuit.
Description
Technical field
The invention belongs to air conditioner electronic control technology field, more particularly to the analog-to-digital conversion of a kind of air conditioner and its master controller
Correct auxiliary circuit.
Background technology
At present, air conditioner is that the running status of air conditioner is controlled by master controller.Master controller includes
Analog to digital conversion circuit, key parameter that analog to digital conversion circuit is sampled air conditioner in running (such as outdoor environment temperature,
The parameter such as voltage and current of complete machine operation) from analog quantity be converted to digital quantity, and turn in analog to digital conversion circuit performing modulus
Transformed error (including gain error and displacement errors) during changing be present, if directly exported analog to digital conversion circuit
Digital quantity be applied to master controller control loop, then the control accuracy of system can be reduced because of the influence of transformed error.For
The conversion accuracy of analog to digital conversion circuit is improved, then its gain error and displacement errors must be corrected.Actually should
It is in following linear relationship between analog quantity X that analog to digital conversion circuit is inputted and the digital quantity Y exported during：
Y=ma × X+b (1)
Wherein, ma and b is respectively gain and offset.
Based on above-mentioned linear relationship, prior art is using single-pass channel correction auxiliary circuit to the analog-to-digital conversion in master controller
Circuit is corrected, the high level signal or low level that the switching tube in the single channel correcting circuit is exported according to master controller
Signal realizes on or off, so that single channel correcting circuit exports corresponding two after voltage division processing is carried out to supply voltage
Individual correction voltage (corresponding to high level signal and low level signal respectively) is to master controller, and master controller is again by this two correction electricity
Pressure obtains corresponding two correction voltage digital quantities after analog to digital conversion circuit carries out analog-to-digital conversion, and according to above-mentioned relation formula
(1) the actual gain ma and real offset b of analog to digital conversion circuit are obtained, and then can be according to actual gain ma and actual shifts
Measure b and complete correction to analog to digital conversion circuit so that analog to digital conversion circuit overcome during analog-to-digital conversion is carried out it is above-mentioned
Transformed error.However, in above-mentioned single-pass channel correction auxiliary circuit, because correction voltage is directly proportional to supply voltage, if electric
Source voltage changes, then correction voltage can also change therewith, so as to cause to make main control because correction voltage is unstable
The problem of device can not realize high-precision correction to analog to digital conversion circuit.
The content of the invention
It is an object of the invention to provide a kind of analog-to-digital conversion of master controller to correct auxiliary circuit, it is intended to solves existing skill
Present in art because correction voltage is unstable master controller can not be realized high-precision correction to analog to digital conversion circuit the problem of.
The present invention is achieved in that a kind of analog-to-digital conversion correction auxiliary circuit of master controller, the master controller bag
Containing analog to digital conversion circuit, the correction voltage that the master controller is exported according to analog-to-digital conversion correction auxiliary circuit is to described
Analog to digital conversion circuit carries out transformed error correction；
The analog-to-digital conversion correction auxiliary circuit includes：Low-pass filter unit, switching tube, divider filter unit and three ends can
Control source of stable pressure；
The input of the low-pass filter unit connects the level output end of the master controller, the low-pass filter unit
Output end connect the controlled end of the switching tube, the input of the switching tube connects the partial pressure control of the divider filter unit
End processed, the input access supply voltage of the divider filter unit, the output end of the divider filter unit and three end
The negative electrode of controllable source of stable pressure is connected to the correction voltage input of the master controller, the reference electricity of the controllable source of stable pressure in three ends altogether
The voltage stabilizing controlled end of divider filter unit described in press bond, the ground terminal of the low-pass filter unit and the output of the switching tube
The anode at end, the ground terminal of the divider filter unit and the controllable source of stable pressure in three ends is connected to ground altogether；
The level signal that the low-pass filter unit is exported to the master controller carries out partial pressure and low-pass filtering treatment
The break-make that corresponding switching signal controls the switching tube is exported afterwards；The divider filter unit is according to the conducting of the switching tube
Or the corresponding adjustment partial pressure coefficient of shut-off, and the corresponding school of voltage output of the reference voltage end according to the controllable source of stable pressure in three ends
Positive electricity is depressed into the master controller；The correction voltage is more than the voltage of the reference voltage end of the controllable source of stable pressure in three ends.
Present invention also offers the analog-to-digital conversion of another master controller to correct auxiliary circuit, and the master controller includes mould
Number change-over circuit, the correction voltage that the master controller is exported according to analog-to-digital conversion correction auxiliary circuit is to the modulus
Change-over circuit carries out transformed error correction；
The analog-to-digital conversion correction auxiliary circuit includes：Low-pass filter unit, switching tube, divider filter unit and three ends can
Control source of stable pressure；
The input of the low-pass filter unit connects the level output end of the master controller, the low-pass filter unit
Output end connect the controlled end of the switching tube, the input of the switching tube connects the partial pressure control of the divider filter unit
End processed, the input connection supply voltage of the divider filter unit, the output end of the divider filter unit connect the master
The correction voltage input of controller, the reference voltage end and negative electrode of the controllable source of stable pressure in three ends connect the partial pressure filter respectively
The the first voltage stabilizing controlled end and the second voltage stabilizing controlled end of ripple unit, the ground terminal of the low-pass filter unit are defeated with the switching tube
The anode for going out end, the ground terminal of the divider filter unit and the controllable source of stable pressure in three ends is connected to ground altogether；
The level signal that the low-pass filter unit is exported to the master controller carries out partial pressure and low-pass filtering treatment
The break-make that corresponding switching signal controls the switching tube is exported afterwards；The divider filter unit is according to the conducting of the switching tube
Or the corresponding adjustment partial pressure coefficient of shut-off, and the corresponding school of voltage output of the reference voltage end according to the controllable source of stable pressure in three ends
Positive electricity is depressed into the master controller；The correction voltage is less than the voltage of the reference voltage end of the controllable source of stable pressure in three ends.
Present invention also offers a kind of air conditioner, and it includes master controller and above-mentioned analog-to-digital conversion correction auxiliary electricity
Road.
The present invention is by using including low-pass filter unit, switching tube, divider filter unit and three ends controllable source of stable pressure
Analog-to-digital conversion corrects auxiliary circuit, and the level signal exported by low-pass filter unit to master controller carries out partial pressure and low pass filtered
The break-make of corresponding switching signal controlling switch pipe is exported after ripple processing；Divider filter unit is according to the on or off of switching tube
Corresponding adjustment partial pressure coefficient, and according to the corresponding correction voltage of voltage output of the reference voltage end of the controllable source of stable pressure in three ends to master
Controller, because the voltage of the reference voltage end of the controllable source of stable pressure in three ends stablizes correction voltage that is constant, therefore being exported
Stable and precision is high, and then master controller can be made to realize high-precision correction to analog to digital conversion circuit.
Brief description of the drawings
Fig. 1 is the structure chart of the analog-to-digital conversion correction auxiliary circuit for the master controller that the embodiment of the present invention one provides；
Fig. 2 is the exemplary circuit structure chart of the analog-to-digital conversion correction auxiliary circuit shown in Fig. 1；
Fig. 3 is the structure chart of the analog-to-digital conversion correction auxiliary circuit for the master controller that the embodiment of the present invention two provides；
Fig. 4 is the exemplary circuit structure chart of the analog-to-digital conversion correction auxiliary circuit shown in Fig. 3；
Fig. 5 is the realization that master controller provided in an embodiment of the present invention is corrected by analog-to-digital conversion correction auxiliary circuit
Flow chart.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
The embodiments of the invention provide the analog-to-digital conversion of two kinds of master controllers to correct auxiliary circuit, with reference to implementing in detail below
Example is described in detail：
Embodiment one：
Fig. 1 shows the structure of the analog-to-digital conversion correction auxiliary circuit for the master controller that the embodiment of the present invention one provides, its
In, master controller 100 includes analog to digital conversion circuit 101, and analog to digital conversion circuit 101 is used for the institute of analog signal sample circuit 102
The analog signal of output is converted to data signal；The school that master controller 100 is exported according to analog-to-digital conversion correction auxiliary circuit 200
Positive voltage carries out transformed error correction to analog to digital conversion circuit 101；For convenience of description, Fig. 1 illustrate only implements with the present invention
The related part of example one, details are as follows：
Analog-to-digital conversion correction auxiliary circuit 200 includes：Low-pass filter unit 201, switching tube 202, divider filter unit 203
And three controllable source of stable pressure IC1 in end.
The level output end P1 of the input connection master controller 100 of low-pass filter unit 201, low-pass filter unit 201
Output end connecting valve pipe 202 controlled end, the partial pressure control of the input connection divider filter unit 203 of switching tube 202
End, the input access supply voltage V of divider filter unit 203DD, the output end of divider filter unit 203 and three ends are controllable steady
Potential source IC1 negative electrode is connected to the correction voltage input P2 of master controller 100, the controllable source of stable pressure IC1 in three ends reference voltage altogether
The voltage stabilizing controlled end of end connection divider filter unit 203, the ground terminal of low-pass filter unit 201 and the output end of switching tube 202, divides
The ground terminal of filter unit 203 and the controllable source of stable pressure IC1 in three ends anode is pressed to be connected to ground altogether.
After the level signal that low-pass filter unit 201 is exported to master controller 100 carries out partial pressure and low-pass filtering treatment
Export the break-make of corresponding switching signal controlling switch pipe 202, conducting or pass of the divider filter unit 203 according to switching tube 202
Disconnected corresponding adjustment partial pressure coefficient, and electricity is corrected according to the voltage output of the controllable source of stable pressure IC1 in three ends reference voltage end accordingly
Master controller 100 is depressed into, the voltage of reference voltage end of the correction voltage more than the controllable source of stable pressure IC1 in three ends.
Specifically, Fig. 2 shows the analog-to-digital conversion correction auxiliary circuit for the master controller that the embodiment of the present invention one provides
Exemplary circuit structure, for convenience of description, the part related to the embodiment of the present invention one is illustrate only, details are as follows：
Low-pass filter unit 201 includes：
First resistor R1, second resistance R2 and the first electric capacity C1；
First resistor R1 first end be low-pass filter unit 201 input, first resistor R1 the second end and second
The common contact of resistance R2 first end and the first electric capacity C1 first end be low-pass filter unit 201 output end, second resistance
The common contact at R2 the second end and the first electric capacity C1 the second end is the ground terminal of low-pass filter unit 201.
Switching tube 202 is specially NMOS tube Q1, NMOS tube Q1 grid, drain electrode and source electrode be respectively switching tube 202 by
Control end, input and output end.
Divider filter unit 203 includes：
3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and the second electric capacity C2；
The common contact of 3rd resistor R3 first end and the 4th resistance R4 first end is the partial pressure of divider filter unit 203
The common contact of control terminal, the 4th resistance R4 the second end and the 5th resistance R5 first end is the voltage stabilizing of divider filter unit 203
The common contact of controlled end, the 5th resistance R5 the second end and the 6th resistance R6 first end is the output of divider filter unit 203
The common contact of end, the 6th resistance R6 the second end and the second electric capacity C2 first end is the input of divider filter unit 203, the
The common contact at two electric capacity C2 the second end and 3rd resistor R3 the second end is the ground terminal of divider filter unit 203.
The controllable source of stable pressure IC1 in three ends can be specifically model TL431 reference voltage stabilizing source.
Above-mentioned analog-to-digital conversion correction auxiliary circuit 200 is described further below in conjunction with operation principle：
The level output end P1 outputs level signals (high level or low level) of master controller 100 to first resistor R1, by
The low pass filter of first resistor R1, second resistance R2 and the first electric capacity C1 compositions carries out low-pass filtering treatment to the level signal
To filter out noise signal, NMOS tube Q1 is avoided to mislead.When level signal is high level, NMOS tube Q1 conductings, then the
Three resistance R3 are short-circuited, and the correction voltage that divider filter unit 203 is exported is point on the 4th resistance R4 and the 5th resistance R5
Pressure, the correction voltage are now shown below：
Wherein, VONThe correction voltage exported by divider filter unit 203 when NMOS tube Q1 is turned on；VrefCan for three ends
Control the voltage of source of stable pressure IC1 reference voltage end.
When level signal is low level, NMOS tube Q1 shut-offs, the correction voltage that divider filter unit 203 is exported is the
Partial pressure on three resistance R3, the 4th resistance R4 and the 5th resistance R5, the correction voltage are now shown below：
Wherein, VOFFThe correction voltage exported by divider filter unit 203 when NMOS tube Q1 is turned off.
Due to the voltage V of the controllable source of stable pressure IC1 in three ends reference voltage endrefIt is not with loading condition and environment temperature
Change and change, so VrefStablize constant, there is accurate numerical value, therefore from the relation above obtained by (2) and (3)
The correction voltage V arrivedONAnd VOFFAnd stable, and it is all higher than Vref。
Specifically, for above-mentioned first resistor R1 and second resistance R2, both form bleeder circuit, second resistance at series connection
Gate source voltage of the partial pressure as NMOS tube Q1 on R2.In actual applications, second resistance R2 resistance is much larger than first resistor
R1 resistance；Between first electric capacity C1 is connected in parallel on NMOS tube Q1 grid source electrode as high-frequency filter capacitor, the first electric capacity C1 appearance
Value need to be much larger than the parasitic capacitance between NMOS tube Q1 grid source electrode；Second electric capacity C2 is arranged at partial pressure as high-frequency filter capacitor
In filter unit 203, its capacitance need to be much larger than the parasitic capacitance between NMOS tube Q1 hourglass source electrode.3rd resistor R3, the 4th electricity
The correction voltage that resistance R4 and the 5th resistance R5 resistance is exported by the electric current on the branch road and divider filter unit 203 determines；The
Six resistance R6 resistance is determined by the controllable source of stable pressure IC1 in three ends operating current.
Wherein, first resistor R1 can be specifically the Chip-R that resistance is 100ohm, and second resistance R2 can be specifically resistance
For 10000ohm Chip-R, the first electric capacity C1 can be specifically that capacitance is 103PF patch capacitor；NMOS tube Q1 is model
The STK7002 enhanced metal-oxide-semiconductor of N-channel；3rd resistor R3 can be specifically resistance be 20000ohm Chip-R, the 4th resistance
R4 can be specifically the Chip-R that resistance is 1000ohm, and the 5th resistance R5 and the 6th resistance R6 can be specifically that resistance is
20000ohm Chip-R, the second electric capacity C2 can be specifically that capacitance is 105PF patch capacitor；If the controllable source of stable pressure in three ends
IC1 is model TL431 reference voltage stabilizing source, then VrefFor 2.5V, in order to the controllable source of stable pressure IC1 in three ends and divider filter list
Member 203 provides bias current, supply voltage VDDV need to be more thanref, so supply voltage VDDSpecifically can value be 3.3V.
When the parameter of above-mentioned each element has determined that, correction voltage (VONAnd VOFF) numerical value can be according to above-mentioned relation
Formula (2) and (3) are determined, and subsequent master controller 100 is by analog to digital conversion circuit 101 by correction voltage (VONAnd VOFF) from mould
Analog quantity value changes corresponding digital quantity value (VONCorresponding digital quantity value and VOFFCorresponding digital quantity value), further according to relation
Formula (1) can obtain the actual gain ma and real offset b of analog to digital conversion circuit 101, so as to according to actual gain ma and
Real offset b is accurately corrected to analog to digital conversion circuit 101.
Embodiment two：
Fig. 3 shows the structure of the analog-to-digital conversion correction auxiliary circuit for the master controller that the embodiment of the present invention two provides, its
In, master controller 100 includes analog to digital conversion circuit 101, and analog to digital conversion circuit 101 is used for the institute of analog signal sample circuit 102
The analog signal of output is converted to data signal；The school that master controller 100 is exported according to analog-to-digital conversion correction auxiliary circuit 200
Positive voltage carries out transformed error correction to analog to digital conversion circuit 101；For convenience of description, Fig. 3 illustrate only implements with the present invention
The related part of example two, details are as follows：
Analog-to-digital conversion correction auxiliary circuit 200 includes：Low-pass filter unit 201, switching tube 202, divider filter unit 203
And three controllable source of stable pressure IC1 in end.
The level output end P1 of the input connection master controller 100 of low-pass filter unit 201, low-pass filter unit 201
Output end connecting valve pipe 202 controlled end, the partial pressure control of the input connection divider filter unit 203 of switching tube 202
End, the input access supply voltage V of divider filter unit 203DD, the output end connection master controller of divider filter unit 203
100 correction voltage input P2, the controllable source of stable pressure IC1 in three ends reference voltage end and negative electrode connect divider filter unit respectively
203 the first voltage stabilizing controlled end and the second voltage stabilizing controlled end, the ground terminal of low-pass filter unit 201 and the output end of switching tube 202,
The ground terminal of divider filter unit 203 and the controllable source of stable pressure IC1 in three ends anode are connected to ground altogether.
After the level signal that low-pass filter unit 201 is exported to master controller 100 carries out partial pressure and low-pass filtering treatment
Export the break-make of corresponding switching signal controlling switch pipe 202, conducting or pass of the divider filter unit 203 according to switching tube 202
Disconnected corresponding adjustment partial pressure coefficient, and electricity is corrected according to the voltage output of the controllable source of stable pressure IC1 in three ends reference voltage end accordingly
Master controller 100 is depressed into, the voltage of reference voltage end of the correction voltage less than the controllable source of stable pressure IC1 in three ends.
Specifically, Fig. 4 shows the analog-to-digital conversion correction auxiliary circuit for the master controller that the embodiment of the present invention two provides
Exemplary circuit structure, for convenience of description, the part related to the embodiment of the present invention two is illustrate only, details are as follows：
Low-pass filter unit 201 includes：
First resistor R1, second resistance R2 and the first electric capacity C1；
First resistor R1 first end be low-pass filter unit 201 input, first resistor R1 the second end and second
The common contact of resistance R2 first end and the first electric capacity C1 first end be low-pass filter unit 201 output end, second resistance
The common contact at R2 the second end and the first electric capacity C1 the second end is the ground terminal of low-pass filter unit 201.
Switching tube 202 is specially NMOS tube Q1, NMOS tube Q1 grid, drain electrode and source electrode be respectively switching tube 202 by
Control end, input and output end.
Divider filter unit 203 includes：
3rd resistor 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 3rd resistor R3 first end and the 4th resistance R4 first end is the partial pressure of divider filter unit 203
The common contact of control terminal, the 4th resistance R4 the second end and the 5th resistance R5 first end is the output of divider filter unit 203
The common contact of end, the 5th resistance R5 the second end and the 6th resistance R6 first end is the first voltage stabilizing of divider filter unit 203
The common contact of controlled end, the 6th resistance R6 the second end and the 7th resistance R7 first end is the second of divider filter unit 203
The common contact of voltage stabilizing controlled end, the 7th resistance R7 the second end and the second electric capacity C2 first end is divider filter unit 203
The common contact at input, the second electric capacity C2 the second end and 3rd resistor R3 the second end is the ground terminal of divider filter unit 203.
The controllable source of stable pressure IC1 in three ends can be specifically model TL431 reference voltage stabilizing source.
Above-mentioned analog-to-digital conversion correction auxiliary circuit 200 is described further below in conjunction with operation principle：
The level output end P1 outputs level signals (high level or low level) of master controller 100 to first resistor R1, by
The low pass filter of first resistor R1, second resistance R2 and the first electric capacity C1 compositions carries out low-pass filtering treatment to the level signal
To filter out noise signal, NMOS tube Q1 is avoided to mislead.When level signal is high level, NMOS tube Q1 conductings, then the
Three resistance R3 are short-circuited, the correction voltage that divider filter unit 203 is exported be the 4th resistance R4 on partial pressure, the correction voltage
Now it is shown below：
Wherein, VONThe correction voltage exported by divider filter unit 203 when NMOS tube Q1 is turned on；VrefCan for three ends
Control the voltage of source of stable pressure IC1 reference voltage end.
When level signal is low level, NMOS tube Q1 shut-offs, the correction voltage that divider filter unit 203 is exported is the
Partial pressure on three resistance R3 and the 4th resistance R4, the correction voltage are now shown below：
Wherein, VOFFThe correction voltage exported by divider filter unit 203 when NMOS tube Q1 is turned off.
Due to the voltage V of the controllable source of stable pressure IC1 in three ends reference voltage endrefIt is not with loading condition and environment temperature
Change and change, so VrefStablize constant, there is accurate numerical value, therefore from the relation above obtained by (4) and (5)
The correction voltage V arrivedONAnd VOFFAnd stable, and respectively less than Vref。
Specifically, for above-mentioned first resistor R1 and second resistance R2, both form bleeder circuit, second resistance at series connection
Gate source voltage of the partial pressure as NMOS tube Q1 on R2.In actual applications, second resistance R2 resistance is much larger than first resistor
R1 resistance；Between first electric capacity C1 is connected in parallel on NMOS tube Q1 grid source electrode as high-frequency filter capacitor, the first electric capacity C1 appearance
Value need to be much larger than the parasitic capacitance between NMOS tube Q1 grid source electrode；Second electric capacity C2 is arranged at partial pressure as high-frequency filter capacitor
In filter unit 203, its capacitance need to be much larger than the parasitic capacitance between NMOS tube Q1 hourglass source electrode.3rd resistor R3, the 4th electricity
The correction that resistance R4, the 5th resistance R5 and the 6th resistance R6 resistance are exported by the electric current on the branch road and divider filter unit 203
Voltage determines；7th resistance R7 resistance is determined by the controllable source of stable pressure IC1 in three ends operating current.
Wherein, first resistor R1 can be specifically the Chip-R that resistance is 100ohm, and second resistance R2 can be specifically resistance
For 10000ohm Chip-R, the first electric capacity C1 can be specifically that capacitance is 103PF patch capacitor；NMOS tube Q1 is model
The STK7002 enhanced metal-oxide-semiconductor of N-channel；3rd resistor R3 can be specifically resistance be 20000ohm Chip-R, the 4th resistance
R4 can be specifically the Chip-R that resistance is 1000ohm, and the 5th resistance R5, the 6th resistance R6 and the 7th resistance R7 can be specifically to hinder
It is worth the Chip-R for 20000ohm, the second electric capacity C2 can be specifically that capacitance is 105PF patch capacitor；If three ends are controllable steady
Potential source IC1 is model TL431 reference voltage stabilizing source, then VrefFor 2.5V, in order to the controllable source of stable pressure IC1 in three ends and partial pressure filter
Ripple unit 203 provides bias current, supply voltage VDDV need to be more thanref, so supply voltage VDDSpecifically can value be 3.3V.
When the parameter of above-mentioned each element has determined that, correction voltage (VONAnd VOFF) numerical value can be according to above-mentioned relation
Formula (4) and (5) are determined, and subsequent master controller 100 is by analog to digital conversion circuit 101 by correction voltage (VONAnd VOFF) from mould
Analog quantity value changes corresponding digital quantity value (VONCorresponding digital quantity value and VOFFCorresponding digital quantity value), further according to relation
Formula (1) can obtain the actual gain ma and real offset b of analog to digital conversion circuit 101, so as to according to actual gain ma and
Real offset b is accurately corrected to analog to digital conversion circuit 101.
Auxiliary circuit 200 is corrected for main control based on the analog-to-digital conversion that the embodiment of the present invention one and embodiment two are provided
Device 100 carries out the good effect gone out embodied in analog-to-digital conversion correction, and the embodiment of the present invention additionally provides a kind of air conditioner, and it is wrapped
Include master controller 100 and above-mentioned analog-to-digital conversion correction auxiliary circuit 200.
Therefore, after air-conditioner system electrification reset, master controller 100 first enters with analog-to-digital conversion correction auxiliary circuit 200
Row communication, gain and offset to the analog to digital conversion circuit 101 in master controller 100 are corrected.This process is specifically such as Fig. 5
Shown, details are as follows：
S1. master controller 100 exports high level to analog-to-digital conversion by its level output end P1 and corrects auxiliary circuit 200；
S2. analog-to-digital conversion corrects auxiliary circuit 200 according to high level output correction voltage VONTo the school of master controller 100
Positive voltage input P2；
S3. the analog to digital conversion circuit 101 in master controller 100 is to correction voltage VONExported accordingly after carrying out analog-to-digital conversion electricity
Digital quantity value YON；
S4. master controller 100 exports low level to analog-to-digital conversion by its level output end P1 and corrects auxiliary circuit 200；
S5. analog-to-digital conversion corrects auxiliary circuit 200 according to low level output correction voltage VOFFTo master controller 100
Correction voltage input P2；
S6. the analog to digital conversion circuit 101 in master controller 100 is to correction voltage VOFFExported after carrying out analog-to-digital conversion conversion
Corresponding digital quantity value YOFF；
S7. master controller 100 is according to correction voltage VONWith digital quantity value YONWith correction voltage VOFFWith digital quantity value YOFFIt is right
The gain of analog to digital conversion circuit 101 and offset are corrected.
After the completion of correction, the analog signal that analog signal sample circuit 102 is sampled is after analog to digital conversion circuit 101
Data signal is converted to, master controller 100 reads the data signal and the working condition to air-conditioner system is detected and controlled
System.
In summary, the embodiment of the present invention is by using including low-pass filter unit 201, switching tube 202, divider filter list
The controllable source of stable pressure IC1 in end of member 203 and three analog-to-digital conversion correction auxiliary circuit 200, by low-pass filter unit 201 to master controller
100 level signals exported export corresponding switching signal controlling switch pipe 202 after carrying out partial pressure and low-pass filtering treatment
Break-make, divider filter unit 203 accordingly adjust partial pressure coefficient according to the on or off of switching tube 202, and controllable according to three ends
The corresponding correction voltage of voltage output of source of stable pressure IC1 reference voltage end is to master controller 100, due to the controllable source of stable pressure in three ends
The voltage of IC1 reference voltage end stablizes correction voltage stabilization and precision height constant, therefore exported, and then can make
Master controller 100 realizes high-precision correction to analog to digital conversion circuit 101.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (12)
1. a kind of analog-to-digital conversion correction auxiliary circuit of master controller, the master controller include analog to digital conversion circuit, the master
The correction voltage that controller is exported according to analog-to-digital conversion correction auxiliary circuit is changed to analog-digital conversion circuit as described
Error correction；Characterized in that, the analog-to-digital conversion correction auxiliary circuit includes：Low-pass filter unit, switching tube, divider filter
The controllable source of stable pressure of unit and three ends；
The input of the low-pass filter unit connects the level output end of the master controller, the low-pass filter unit it is defeated
Go out the controlled end that end connects the switching tube, the input of the switching tube connects the partial pressure control of the divider filter unit
End, the input access supply voltage of the divider filter unit, the output end of the divider filter unit can with three end
The negative electrode of control source of stable pressure is connected to the correction voltage input of the master controller, the reference voltage of the controllable source of stable pressure in three ends altogether
End connects the voltage stabilizing controlled end of the divider filter unit, the ground terminal of the low-pass filter unit and the output of the switching tube
The anode at end, the ground terminal of the divider filter unit and the controllable source of stable pressure in three ends is connected to ground altogether；
It is defeated after level signal progress partial pressure and low-pass filtering treatment that the low-pass filter unit is exported to the master controller
Go out the break-make that corresponding switching signal controls the switching tube；Conducting or pass of the divider filter unit according to the switching tube
Disconnected corresponding adjustment partial pressure coefficient, and electricity is corrected according to the voltage output of the reference voltage end of the controllable source of stable pressure in three ends accordingly
It is depressed into the master controller；The correction voltage is more than the voltage of the reference voltage end of the controllable source of stable pressure in three ends.
2. analog-to-digital conversion as claimed in claim 1 corrects auxiliary circuit, it is characterised in that the low-pass filter unit includes：
First resistor, second resistance and the first electric capacity；
The first end of the first resistor be the low-pass filter unit input, the second end of the first resistor with it is described
The common contact of the first end of second resistance and the first end of first electric capacity is the output end of the low-pass filter unit, described
The common contact at the second end of second resistance and the second end of first electric capacity is the ground terminal of the low-pass filter unit.
3. analog-to-digital conversion as claimed in claim 1 corrects auxiliary circuit, it is characterised in that the switching tube is NMOS tube, institute
Grid, drain electrode and the source electrode for stating NMOS tube are respectively the controlled end, input and output end of the switching tube.
4. analog-to-digital conversion as claimed in claim 1 corrects auxiliary circuit, it is characterised in that the divider filter unit includes：
3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance and the second electric capacity；
The common contact of the first end of the 3rd resistor and the first end of the 4th resistance is point of the divider filter unit
Control terminal is pressed, the second end of the 4th resistance and the common contact of the first end of the 5th resistance are the divider filter unit
Voltage stabilizing controlled end, the common contact of the second end of the 5th resistance and the first end of the 6th resistance is the divider filter
The output end of unit, the second end of the 6th resistance and the common contact of the first end of second electric capacity are the divider filter
The input of unit, the common contact at the second end of second electric capacity and the second end of the 3rd resistor is the divider filter
The ground terminal of unit.
5. analog-to-digital conversion as claimed in claim 1 corrects auxiliary circuit, it is characterised in that the controllable source of stable pressure in three ends is type
Number be TL431 reference voltage stabilizing source.
6. a kind of air conditioner, it includes master controller, it is characterised in that the air conditioner is also included as claim 1 to 5 is any
Analog-to-digital conversion correction auxiliary circuit described in.
7. a kind of analog-to-digital conversion correction auxiliary circuit of master controller, the master controller include analog to digital conversion circuit, the master
The correction voltage that controller is exported according to analog-to-digital conversion correction auxiliary circuit is changed to analog-digital conversion circuit as described
Error correction；Characterized in that, the analog-to-digital conversion correction auxiliary circuit includes：Low-pass filter unit, switching tube, divider filter
The controllable source of stable pressure of unit and three ends；
The input of the low-pass filter unit connects the level output end of the master controller, the low-pass filter unit it is defeated
Go out the controlled end that end connects the switching tube, the input of the switching tube connects the partial pressure control of the divider filter unit
End, the input connection supply voltage of the divider filter unit, the output end of the divider filter unit connect the master control
The correction voltage input of device processed, the reference voltage end and negative electrode of the controllable source of stable pressure in three ends connect the divider filter respectively
The the first voltage stabilizing controlled end and the second voltage stabilizing controlled end of unit, the ground terminal of the low-pass filter unit and the output of the switching tube
The anode at end, the ground terminal of the divider filter unit and the controllable source of stable pressure in three ends is connected to ground altogether；
It is defeated after level signal progress partial pressure and low-pass filtering treatment that the low-pass filter unit is exported to the master controller
Go out the break-make that corresponding switching signal controls the switching tube；Conducting or pass of the divider filter unit according to the switching tube
Disconnected corresponding adjustment partial pressure coefficient, and electricity is corrected according to the voltage output of the reference voltage end of the controllable source of stable pressure in three ends accordingly
It is depressed into the master controller；The correction voltage is less than the voltage of the reference voltage end of the controllable source of stable pressure in three ends.
8. analog-to-digital conversion as claimed in claim 7 corrects auxiliary circuit, it is characterised in that the low-pass filter unit includes：
First resistor, second resistance and the first electric capacity；
The first end of the first resistor be the low-pass filter unit input, the second end of the first resistor with it is described
The common contact of the first end of second resistance and the first end of first electric capacity is the output end of the low-pass filter unit, described
The common contact at the second end of second resistance and the second end of first electric capacity is the ground terminal of the low-pass filter unit.
9. analog-to-digital conversion as claimed in claim 7 corrects auxiliary circuit, it is characterised in that the switching tube is NMOS tube, institute
Grid, drain electrode and the source electrode for stating NMOS tube are respectively the controlled end, input and output end of the switching tube.
10. analog-to-digital conversion as claimed in claim 7 corrects auxiliary circuit, it is characterised in that divider filter unit includes：
3rd resistor, 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 the 3rd resistor and the first end of the 4th resistance is point of the divider filter unit
Control terminal is pressed, the second end of the 4th resistance and the common contact of the first end of the 5th resistance are the divider filter unit
Output end, the common contact of the second end of the 5th resistance and the first end of the 6th resistance is the divider filter unit
The first voltage stabilizing controlled end, the common contact of the second end of the 6th resistance and the first end of the 7th resistance is the partial pressure
Second voltage stabilizing controlled end of filter unit, the second end of the 7th resistance and the common contact of the first end of second electric capacity are
The input of the divider filter unit, the common contact at the second end of second electric capacity and the second end of the 3rd resistor are
The ground terminal of the divider filter unit.
11. analog-to-digital conversion as claimed in claim 7 corrects auxiliary circuit, it is characterised in that the controllable source of stable pressure in three ends is
Model TL431 reference voltage stabilizing source.
12. a kind of air conditioner, it includes master controller, it is characterised in that the air conditioner also includes such as claim 7 to 11 times
Analog-to-digital conversion correction auxiliary circuit described in one.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Application Number | Priority Date | Filing Date | Title |
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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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| Publication Number | Publication Date |
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| CN104901537A CN104901537A (en) | 2015-09-09 |
| CN104901537B true CN104901537B (en) | 2018-01-16 |
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| CN107271762A (en) * | 2017-06-14 | 2017-10-20 | 广东美的暖通设备有限公司 | The compensation circuit of sample circuit, compensation method, air conditioner |
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| JP5597660B2 (en) * | 2012-03-05 | 2014-10-01 | 株式会社東芝 | AD converter |
| CN102843051B (en) * | 2012-08-24 | 2016-02-03 | 天津三星电子有限公司 | Power supply adaptor |
| CN103472751B (en) * | 2013-09-16 | 2016-03-02 | 重庆长安汽车股份有限公司 | Pure electric automobile AD sample circuit |
| CN204652221U (en) * | 2015-05-28 | 2015-09-16 | 广东美的制冷设备有限公司 | The analog-to-digital conversion of a kind of air conditioner and master controller thereof corrects auxiliary circuit |
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