CN113653666B - PG fan control device - Google Patents
PG fan control device Download PDFInfo
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- CN113653666B CN113653666B CN202111140614.6A CN202111140614A CN113653666B CN 113653666 B CN113653666 B CN 113653666B CN 202111140614 A CN202111140614 A CN 202111140614A CN 113653666 B CN113653666 B CN 113653666B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention provides a PG fan control device, which comprises: the switching power supply module, the optocoupler isolation module and the control module are used for: detecting a starting speed command voltage at a motor side of the optical coupling isolation module, and determining a starting duty ratio according to the no-load speed command voltage and the starting speed command voltage; determining a proportionality coefficient between the speed command voltage and the duty cycle; determining a minimum duty cycle and a maximum duty cycle; when a fan starting instruction and a corresponding target rotating speed sent by a main control board are received, a PG fan is controlled to start by adopting a starting duty ratio, and the PG fan is accelerated to the target rotating speed; and periodically acquiring the actual rotating speed of the PG fan, and carrying out fault judgment and rotating speed control on the PG fan according to the actual rotating speed, the target rotating speed, the minimum duty ratio and the maximum duty ratio. Before the PG fan is started, the control module is used for determining the starting duty ratio, the minimum duty ratio and the maximum duty ratio, so that the burn-in loss caused by improper parameter setting can be avoided.
Description
Technical Field
One or more embodiments of the present disclosure relate to the field of fan control technologies, and in particular, to a PG fan control device.
Background
In the currently mainstream variable frequency air conditioner products, a PG fan (Pulse Generate Motor in english) is mostly selected as an indoor fan and an outdoor fan. The singlechip adjusts the output duty ratio of the pulse width modulation module (namely the PWM module) by comparing the current rotating speed with the target rotating speed, so as to change the conduction angle and the conduction time of a switching device of the PG fan, thereby realizing stepless stable speed regulation of the PG fan. At present, the PG fans used by the inner fan and the outer fan of the air conditioner are directly connected with the inner main control board and the outer main control board through the socket, and the PG fans are controlled by the inner main control board and the outer main control board, so that the structure is simple and compact, and the whole control flow is completed by only one single chip microcomputer. However, the disadvantage is that once the product series needs to be expanded to increase the number of PG fans and the control capacity of the inner and outer main control boards is exceeded, the system must be redesigned.
Meanwhile, the control of the PG fan involves a plurality of important parameters, and the values of the important parameters are important for the control of the PG fan. If the setting is improper, the PG fan cannot be driven to operate or the fault is misjudged, and if the setting is improper, the PG fan is burnt out, so that irrecoverable loss is caused. The current parameter determination method is to connect the PG fan to the main control circuit board (namely, the outdoor PG fan is connected to the outer machine control board, the indoor PG fan is connected to the inner machine control board), gradually increase the PG fan with a relatively safe small value, and judge the specific value of the parameter according to the actually measured fan rotating speed. In this way, the efficiency is low and there is a risk of problems. Because once a certain set point exceeds the upper limit, the motor may be directly burned out, resulting in irrecoverable cost loss.
Disclosure of Invention
One or more embodiments of the present specification describe a PG blower control device.
The invention provides a weak-current control device, which is respectively connected with a main control board and a PG fan, and comprises: switching power supply module, opto-coupler isolation module and control module, wherein:
the switching power supply module is used for: converting an alternating current power supply into direct current power supplies required by the control module and the PG fan respectively;
the optocoupler isolation module is used for: isolating the direct current power supply of the PG fan from the direct current power supply of the control module;
the control module is used for: detecting a starting speed command voltage at a motor side of the optocoupler isolation module, and determining a starting duty ratio according to an idle speed command voltage and the starting speed command voltage; determining a proportionality coefficient between the speed command voltage and the duty cycle; determining a minimum duty cycle and a maximum duty cycle according to the proportionality coefficient, the starting speed command voltage, the starting duty cycle, the rated no-load speed command voltage and the rated full-load speed command voltage; when a fan starting instruction and a corresponding target rotating speed sent by the main control board are received, the PG fan is controlled to start by adopting the starting duty ratio, and the PG fan is accelerated to the target rotating speed; and periodically acquiring the actual rotating speed of the PG fan, and performing fault judgment and rotating speed control on the PG fan according to the actual rotating speed, the target rotating speed, the minimum duty ratio and the maximum duty ratio.
Before a PG fan is started, a start duty ratio, a minimum duty ratio and a maximum duty ratio are determined through a control module, then when a start fan instruction and a corresponding target rotating speed sent by a main control board are received, the start duty ratio is adopted to control the start of the PG fan, and fault judgment and rotating speed control are carried out according to the minimum duty ratio and the maximum duty ratio. The burn-in loss caused by improper parameter setting can be avoided, and meanwhile, compared with the mode in the prior art, the efficiency of parameter setting can be improved. In addition, if the capacity is required to be expanded, the program of the main control board is not required to be modified, and only the control logic of the control module is required to be modified appropriately, so that the capacity is slightly modified, and compared with the mode that only the program of the main control board can be modified in the prior art, the capacity is more convenient and quicker.
Drawings
In order to more clearly illustrate the embodiments of the present description or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present description, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a PG fan control device in one embodiment of the present disclosure;
FIG. 2a is a table of the Vsp-PWM duty cycle of a PG fan in one embodiment of the disclosure;
FIG. 2b is a graph of Vsp-PWM duty cycle versus PG fan in one embodiment of the present disclosure;
FIG. 3 is a graph of the correspondence between duty cycle and speed command voltage in one embodiment of the present disclosure;
fig. 4 is a graph showing the correspondence between the duty ratio and the rotation speed in one embodiment of the present specification.
Detailed Description
The following describes the scheme provided in the present specification with reference to the drawings.
In a first aspect, the present invention provides a PG fan control apparatus, where the PG fan control apparatus is connected to a main control board and a PG fan, as shown in fig. 1, and the PG fan control apparatus includes: switching power supply module, opto-coupler isolation module and control module, wherein:
the switching power supply module is used for: converting an alternating current power supply into direct current power supplies required by the control module and the PG fan respectively;
the optocoupler isolation module (not shown in fig. 1) is for: isolating the direct current power supply of the PG fan from the direct current power supply of the control module;
the control module is used for: detecting a starting speed command voltage at a motor side of the optocoupler isolation module, and determining a starting duty ratio according to an idle speed command voltage and the starting speed command voltage; determining a proportionality coefficient between the speed command voltage and the duty cycle; determining a minimum duty cycle and a maximum duty cycle according to the proportionality coefficient, the starting speed command voltage, the starting duty cycle, the rated no-load speed command voltage and the rated full-load speed command voltage; when a fan starting instruction and a corresponding target rotating speed sent by the main control board are received, the PG fan is controlled to start by adopting the starting duty ratio, and the PG fan is accelerated to the target rotating speed; and periodically acquiring the actual rotating speed of the PG fan, and performing fault judgment and rotating speed control on the PG fan according to the actual rotating speed, the target rotating speed, the minimum duty ratio and the maximum duty ratio.
The PG fan is characterized in that the rotating speed of the motor is controlled by the conduction angle of the silicon controlled rectifier, but not by the relay. In the air conditioner, the PG fan is powered by 220VAC, and the speed regulation of the fan is realized by adjusting the conduction angle.
Among them, the control of PG fans involves several important parameters: a minimum duty ratio d_min corresponding to the minimum rotation speed and a speed command voltage vsp_min thereof, a start duty ratio d_star corresponding to the start rotation speed and a speed command voltage vsp_star thereof, and a maximum duty ratio d_max corresponding to the maximum rotation speed and a speed command voltage vsp_max thereof. The correspondence may be seen from fig. 3 and 4, wherein fig. 3 shows the correspondence between the duty ratio and the speed command voltage, and fig. 4 shows the correspondence between the duty ratio and the rotation speed. Wherein D_min is used for controlling the lowest rotating speed of the fan and can be used for judging whether the motor has faults or not, D_star (or Vsp_star) is used for providing a proper initial starting voltage so that the motor can rotate from a standstill, and D_max (or Vsp_max) is used for setting the upper rotating speed limit of the motor so as to ensure that the motor works in a safety range.
In practice, the PG fan control device corresponding to the outdoor PG fan is connected with the main control board of the external machine, and the PG fan control device corresponding to the indoor PG fan is connected with the main control board of the internal machine. One main control board can be connected with a plurality of PG fan control devices, and each PG fan control device can be connected with a plurality of PG fans. The PG fan control device is independent of the main control board, and is used as a slave machine, and can communicate with the main control board in real time through a serial port, receive instructions from the main control board, and upload parameters such as the state of the PG fan to the main control board. Because each PG fan control device can be connected with a plurality of PG fans, the quantity of the connected PG fans can be flexibly set according to the power requirement of the product in practice. When the power is required to be increased, the program of the main control board can be kept unchanged, and the purposes of capacity expansion and compatibility of a plurality of power products can be realized by only modifying the bottom layer configuration and logic control in the control module.
For example, the switching power supply module may convert 220v ac power into 310v dc voltage source Vdc, 3.3v dc voltage source Vcc, and 15v dc voltage source Vsp, where the dc voltage source Vdc is used for supplying to a driving module of the PG fan, and the driving module drives the PG fan to operate with 310 v. The dc voltage source Vcc is for supplying the control module, the dc voltage source Vsp is for supplying the drive module of the PG blower, and the drive module supplies power to other modules in the circuit by 15 v. It can be seen that the switching power supply module can convert the ac power supply into the dc power supply required by the control module and the PG blower.
The optical coupling isolation module can isolate the direct current power supply of the PG fan from the direct current power supply of the control module, and mainly effectively isolates a 310v high-voltage direct current voltage source and a 3.3v low-voltage direct current voltage source, so that mutual interference of the two sources is avoided.
The control module can output PWM square waves with different frequencies and different duty ratios, and can also receive the pulse returned by the PG fan so as to further know the actual rotating speed of the PG fan.
Some preparation work is required before the PG fan control apparatus is used, for example, the rated no-load speed command voltage vsp_ idl, the rated full-load speed command voltage vsp_full, the speed command voltage vsp_0 corresponding to less than 2% of the duty cycle, and the speed command voltage vsp_100 corresponding to 100% of the duty cycle of the PG fan are determined in advance according to specifications. In addition, the PG fan control device is connected with 220v alternating current power supply, so that stable Vdc, vcc, vsp can be generated through the switching power supply module. The control module is initialized, including the modules of PWM, timer, general purpose input/output interface GPIO, external interrupt and the like, which are needed by driving and controlling the motor.
It can be appreciated that the algorithm flow of the control module generally includes:
(1) Detecting a starting speed command voltage at a motor side of the optocoupler isolation module, and determining a starting duty ratio according to an idle speed command voltage and the starting speed command voltage;
an initial value of the start duty ratio may be set in advance in a program of the control module, and then the corresponding start speed command voltage may be detected at the motor side.
In particular implementations, (1) the step of determining the start-up duty cycle may include:
s1, detecting a starting speed command voltage at a motor side of the optocoupler isolation module, and comparing the starting speed command voltage Vsp_star with the no-load speed command voltage Vsp_ idl;
s2, if the ratio of the starting speed command voltage to the idle speed command voltage is smaller than a first value, increasing the starting duty ratio, determining the starting speed command voltage corresponding to the increased starting duty ratio, and returning to S1;
for example, the first value is 1.2, that is, if the start-up speed command voltage vsp_star is smaller than 1.2 times the idle speed command voltage vsp_ idl, which means that the start-up duty ratio corresponding to the start-up speed command voltage vsp_star is smaller at this time, the start-up duty ratio needs to be increased based on the initial value at this time, and then the process returns to S1, where the start-up speed command voltage is continuously detected, and then the comparison is performed.
S3, if the ratio of the starting speed command voltage to the idle speed command voltage is larger than a second value, reducing the starting duty ratio, determining the starting speed command voltage corresponding to the reduced starting duty ratio, and returning to S1;
for example, the second value is 1.5, that is, the start-up speed command voltage is greater than 1.5 times the idle speed command voltage, which means that the start-up duty ratio corresponding to the start-up speed command voltage vsp_star is relatively large at this time, and the start-up duty ratio needs to be reduced based on the initial value at this time, and then the second value returns to S1, and the start-up speed command voltage is continuously detected and compared.
S4, if the ratio of the starting speed command voltage to the idle speed command voltage is within the preset range, outputting a current starting duty ratio; wherein the first value is less than the second value.
For example, the ratio of the start-up speed command voltage to the idle speed command voltage falls within [1.2,1.5], which indicates that the start-up speed command voltage and the idle speed command voltage are equivalent, and the start-up duty at this time is very suitable, and the start-up duty at this time may be used as the start-up duty for the subsequent steps without adjustment.
Of course, the preset range may also be [0.9,1.5], where the first value is 0.9 and the second value is 1.5.
(2) Determining a proportionality coefficient between the speed command voltage and the duty cycle; determining a minimum duty cycle and a maximum duty cycle according to the proportionality coefficient, the starting speed command voltage, the starting duty cycle, the rated no-load speed command voltage and the rated full-load speed command voltage;
in particular implementations, the control module may be configured to: calculating the scaling factor using a first formula comprising:
K＝(Vsp_100-Vsp_0)/100
where K is the proportionality coefficient, vsp_0 is a speed command voltage corresponding to a duty cycle of 2%, and vsp_100 is a speed command voltage corresponding to a duty cycle of 100%.
The mapping relation between the speed command voltage and the PWM duty ratio is provided in the specification of the PG fan, the speed command voltage corresponding to the duty ratio of 2% and the speed command voltage corresponding to the duty ratio of 100% are found from the mapping relation, and the two voltage values are input into a first formula, so that the proportionality coefficient can be obtained.
In particular implementations, the process of determining the minimum duty cycle and the maximum duty cycle may include:
a1, determining a minimum starting speed command voltage according to a preset minimum proportion value and a rated no-load speed command voltage; determining a minimum duty cycle according to the proportionality coefficient, the starting speed command voltage, the starting duty cycle and the minimum starting speed command voltage;
wherein, the control module may be specifically configured to: calculating a minimum start-up speed command voltage using a second formula comprising:
Vsp_min＝Kmin*Vsp_idl
wherein vsp_min is the minimum starting speed command voltage, kmin is the preset minimum ratio value, kmin has a value range of [0.6,1.0 ], and vsp_ idl is the rated no-load speed command voltage.
For example, kmin is 0.7, vsp_ idl is 3.3V, and vsp_min=2.31v is calculated. The proper Kmin can be selected from [0.6, 1.0) according to the requirement of air conditioning capacity.
In particular implementations, the control module may be configured to: calculating the minimum duty cycle using a third formula comprising:
Dmin＝D_star-(Vsp_star-Vsp_min)/K
wherein Dmin is the minimum duty cycle, d_star is the start duty cycle, vsp_star is the start speed command voltage, vsp_min is the minimum start speed command voltage, and K is the proportionality coefficient. The third formula is derived from (vsp_star-vsp_min)/(d_star-Dmin) =k.
a2, determining a maximum starting speed command voltage according to a preset maximum proportional value and a rated full-load speed command voltage; and determining the maximum duty ratio according to the proportionality coefficient, the rated full-load speed command voltage and the maximum starting speed command voltage.
Wherein, the control module may be specifically configured to: calculating the maximum start-up speed command voltage using a fourth formula comprising:
Vsp_max＝Kmax*Vsp_full
wherein vsp_max is the maximum start-up speed command voltage, kmax is the preset maximum ratio value, kmax has a value range of [0.75,1.0 ], and vsp_full is the rated full-load speed command voltage.
For example, kmax is 0.75, vsp_full is 5.7, and vsp_max= 4.275V is calculated. The appropriate Kmax can be selected from [0.75,1.0) according to the air conditioning capacity requirements.
Wherein, the control module specifically can be used for: calculating the maximum duty cycle using a fifth formula, the fifth formula comprising:
Dmax＝100-(Vsp_full-Vsp_max)/K
where Dmax is the maximum duty ratio, vsp_full is the rated full-load speed command voltage, vsp_max is the maximum start-up speed command voltage, and K is a proportionality coefficient. The fifth formula is derived from (vsp_full-vsp_max)/(100-Dmax) =k.
(3) When a fan starting instruction and a corresponding target rotating speed sent by the main control board are received, the PG fan is controlled to start by adopting the starting duty ratio, and the PG fan is accelerated to the target rotating speed;
when the main control board sends a fan starting instruction and a target rotating speed to the PG fan control device through the serial port, the PG fan control device can assign a starting duty ratio to a PWM unit in the control module, and the PWM unit outputs a corresponding PWM square wave to the PG fan according to the starting duty ratio, so that the PG fan is started, and the PG fan can gradually rotate from rest and gradually accelerate to the target rotating speed.
(4) And periodically acquiring the actual rotating speed of the PG fan, and performing fault judgment and rotating speed control on the PG fan according to the actual rotating speed, the target rotating speed, the minimum duty ratio and the maximum duty ratio.
In the acceleration process of the PG fan, the PG fan control device can periodically acquire the actual rotation speed of the PG fan, then judge whether the PG fan fails or not and control the rotation speed. The control module may be specifically configured to: after the preset duration of the start of the PG fan, if the actual rotation speed of the PG fan does not reach the rotation speed corresponding to the minimum duty ratio, the PG fan fails; if the difference value between the actual rotating speed and the target rotating speed exceeds a threshold value, the PG fan fails; and if the duty ratio corresponding to the target rotating speed is larger than the maximum duty ratio, limiting the rotating speed of the PG fan to the rotating speed corresponding to the maximum duty ratio.
For example, if the fan still does not reach the rotation speed corresponding to the minimum duty ratio after 5s of starting, the PG fan fails. If the actual rotating speed and the target rotating speed still have a larger gap after a longer time, the PG fan is also proved to be faulty. If the target rotating speed of the fan exceeds the rotating speed corresponding to the maximum duty ratio, limiting the rotating speed of the PG fan to the rotating speed corresponding to the maximum duty ratio, and not accelerating any more.
In an implementation, the apparatus may further include: the pilot lamp, control module is still used for: and when the fan fails, the indicator lamp is lightened. Of course, other indicator lights may be included in addition to the fault indicator lights to indicate other conditions of the PG blower.
In a specific implementation, the periodically obtaining, by the control module, the actual rotation speed of the PG fan may specifically include: determining whether an external interrupt input signal is effective at a rising edge or effective at a falling edge, if the rising edge is effective, determining that the idle period level of the PG fan is low, and if the falling edge is effective, determining that the idle period level of the PG fan is high; and in the non-idle period, determining the actual rotating speed of the PG fan according to the number of feedback pulses received by an input port of the external interrupt input signal in one period.
The external interrupt input signal is a signal input to the FG pin (Feedback Generater, i.e., the input port) of the control module by the PG fan, and this signal can be used to calculate the actual rotation speed of the PG fan. Whether the rising edge is effective or the falling edge is effective is set in advance, if the rising edge is effective, the level of the FG pin input to the control module by the PG fan in the idle period is low, and the level of the FG pin input to the control module in the non-idle period is high. If the external interrupt input signal is effective in the falling edge, the level of the FG pin input to the control module by the PG fan in the idle period is high, and the level of the FG pin input to the control module in the non-idle period is low.
For example, in the non-idle period, 12 pulse signals are input to the control module by the PG fan in one period, that is, the PG fan rotates 12 circles in the period, so as to obtain the actual rotation speed of the PG fan.
It will be appreciated that the idle period must be high if the rising edge is active and low if the falling edge is active. If not, it needs to be checked and reconfigured to ensure that the PG fan can be output to the control module for proper idle level.
Therefore, the invention can rapidly determine three important parameters of the starting duty ratio, the maximum duty ratio and the minimum duty ratio, namely, the three parameters can be determined before the fan is started, and the fan is controlled to start after the determination, so that the fan can be rapidly started, and the fan can be prevented from being burnt out due to careless parameter setting in the test stage.
For example, for a 10P outdoor unit of an air conditioner, two PG motors with DC of 310V/100W and rated rotation speed of 850r/min are adopted as outdoor fans. And connecting one PG fan control device with a main control board of the outdoor unit, and connecting the PG fan control device with two PG outdoor fans. The switching power supply module in the PG fan control device provides a required direct current voltage source for each PG outdoor fan: DC310V (i.e., vdc), DC15V (i.e., vcc), and DC5V (i.e., vsp). The PG fan control device adopts a control module of 64pin with a certain 24Mhz main frequency and three PWM modules inside, and the PG fan control device is used as a slave to carry out RS485 communication with a main control board of 100pin (the baud rate is set to 1200bps, LSB, and 1 even check bit is carried out).
The motor specifications find that the no-load speed command voltage vsp_ idl is 3.3V, the speed command voltage range is 0-6.5V, the rated full-load speed command voltage vsp_full is 5.2V, and the vsp_100 corresponding to the vsp_0 lower than 2% duty ratio and the vsp_100 corresponding to 100% duty ratio are 1.8V and 5.7V respectively, as shown in fig. 2a and 2 b.
Three key parameters are determined according to the following specific steps:
1. initializing modules such as PWM1, PWM2, timer1, timer2, external interrupt INT0, INT1, GPIO and the like of the PG fan control device;
2. setting the initial value of the starting duty ratio of each of PWM1 and PWM2 to be 25%, corresponding to the starting Speed Sp_star of 230 (thousandth), enabling the external interrupt input signal INT0 by the falling edge, measuring the square wave frequency output by an SP (Speed Pulse) pin to be 3Mhz at the moment, and enabling the level of pins FG1 and FG2 of the external interrupt input signal to be high during the idle period;
3. the starting speed command voltage Vsp_star measured at the motor side of the optical coupling isolation module is 3.09V and is 0.94 times of the no-load speed command voltage Vsp_ idl, and the starting speed command voltage Vsp_star is approximately equivalent to the no-load speed command voltage Vsp_ idl, so that the requirement can be met without changing the initial value of the Vsp_star, namely the starting duty ratio;
4. according to a direct proportion function relation between a speed command voltage provided by a specification of the PG fan and a PWM duty ratio (%), calculating a proportion coefficient K: k= (5.7-1.8)/(100-0) =0.039;
5. according to the 10P air conditioning capacity requirement, vsp_min=0.7x3.3V=2.31V, a minimum duty ratio D_min is calculated as '10' from dmin=D_star- (Vsp_star-Vsp_min)/K, and the minimum duty ratio D_min is converted into a value with a unit of thousandth required by a program, namely '100';
6. according to the 10P air conditioning capacity requirement, vsp_max=0.75×5.7= 4.275V is set in consideration of the full-load safe wind speed range under various high and low temperature environments, and according to the formula Dmax=100-
(vsp_full-vsp_max)/K, the maximum duty cycle d_max can be obtained as "628" (in thousandth);
7. when the control module of the PG motor control device receives the starting instructions and target rotating speeds of the two fans sent by the main control board of the outdoor unit through the serial port, the starting duty ratio is assigned to PWM1 and PWM1, so that the two PG fans gradually rotate and accelerate to the target rotating speeds.
In the acceleration process, the control module can periodically calculate the actual wind speed according to the feedback pulse of the PG fan and perform fault judgment. If the actual rotating speed of the fan cannot reach the rotating speed Sp_min corresponding to the minimum duty ratio after the fan is started for 5 seconds, judging that the fan is in fault; if the difference value between the target wind speed and the actual wind speed exceeds a set threshold value after a long time, judging that the fan is in fault; if the duty ratio corresponding to the target wind speed exceeds the maximum duty ratio D_max, the target wind speed is limited to D_max, namely, the rotation speed is limited to the rotation speed corresponding to the maximum duty ratio.
The invention provides an air conditioner PG motor control device which is independent of an outdoor or indoor machine main control board and can be used for driving and controlling a plurality of PG fans. Meanwhile, before the motor is started, corresponding key control parameters can be determined, burn-in loss caused by improper parameter setting can be avoided, and the motor has compatibility and flexibility on fan driving capability of motors of different models, so that development period can be effectively shortened, and development efficiency is improved.
In this specification, each embodiment is described in a progressive manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for the device embodiments, since they are substantially similar to the method embodiments, the description is relatively simple, and reference is made to the description of the method embodiments in part.
Those skilled in the art will appreciate that in one or more of the examples described above, the functions described in the present invention may be implemented in hardware, software, a pendant, or any combination thereof. When implemented in software, these functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present invention in further detail, and are not to be construed as limiting the scope of the invention, but are merely intended to cover any modifications, equivalents, improvements, etc. based on the teachings of the invention.
Claims (10)
1. The utility model provides a PG fan controlling means, its characterized in that, PG fan controlling means is connected with main control board and PG fan respectively, PG fan controlling means includes: switching power supply module, opto-coupler isolation module and control module, wherein:
the switching power supply module is used for: converting an alternating current power supply into direct current power supplies required by the control module and the PG fan respectively;
the optocoupler isolation module is used for: isolating the direct current power supply of the PG fan from the direct current power supply of the control module;
the control module is used for: detecting a starting speed command voltage at a motor side of the optocoupler isolation module, and determining a starting duty ratio according to an idle speed command voltage and the starting speed command voltage; determining a proportionality coefficient between the speed command voltage and the duty cycle; determining a minimum duty cycle and a maximum duty cycle according to the proportionality coefficient, the starting speed command voltage, the starting duty cycle, the rated no-load speed command voltage and the rated full-load speed command voltage; when a fan starting instruction and a corresponding target rotating speed sent by the main control board are received, the PG fan is controlled to start by adopting the starting duty ratio, and the PG fan is accelerated to the target rotating speed; periodically acquiring the actual rotating speed of the PG fan, and performing fault judgment and rotating speed control on the PG fan according to the actual rotating speed, the target rotating speed, the minimum duty ratio and the maximum duty ratio;
the control module is specifically used for: after the preset duration of the start of the PG fan, if the actual rotation speed of the PG fan does not reach the rotation speed corresponding to the minimum duty ratio, the PG fan fails; if the difference value between the actual rotating speed and the target rotating speed exceeds a threshold value, the PG fan fails; and if the duty ratio corresponding to the target rotating speed is larger than the maximum duty ratio, limiting the rotating speed of the PG fan to the rotating speed corresponding to the maximum duty ratio.
2. The device according to claim 1, wherein the detecting a start-up speed command voltage at the motor side of the optocoupler isolation module, determining a start-up duty cycle according to an idle speed command voltage and the start-up speed command voltage, specifically comprises:
s1, detecting a starting speed command voltage at a motor side of the optocoupler isolation module, and comparing the starting speed command voltage with the idle speed command voltage;
s2, if the ratio of the starting speed command voltage to the idle speed command voltage is smaller than a first value, increasing the starting duty ratio, determining the starting speed command voltage corresponding to the increased starting duty ratio, and returning to S1;
s3, if the ratio of the starting speed command voltage to the idle speed command voltage is larger than a second value, reducing the starting duty ratio, determining the starting speed command voltage corresponding to the reduced starting duty ratio, and returning to S1;
s4, if the ratio of the starting speed command voltage to the idle speed command voltage falls within a preset range, outputting a current starting duty ratio;
wherein the first value is less than the second value.
3. The apparatus of claim 1, wherein the control module is specifically configured to: calculating the scaling factor using a first formula comprising:
K＝(Vsp_100-Vsp_0)/100
where K is the proportionality coefficient, vsp_0 is a speed command voltage corresponding to a duty cycle of 2%, and vsp_100 is a speed command voltage corresponding to a duty cycle of 100%.
4. The apparatus of claim 1, wherein the control module determines a minimum duty cycle and a maximum duty cycle based on the scaling factor, the start-up speed command voltage, the start-up duty cycle, the nominal idle speed command voltage, and the nominal full speed command voltage, comprising:
determining a minimum starting speed command voltage according to a preset minimum proportion value and a rated no-load speed command voltage; determining a minimum duty cycle according to the proportionality coefficient, the starting speed command voltage, the starting duty cycle and the minimum starting speed command voltage;
determining a maximum starting speed command voltage according to a preset maximum proportional value and a rated full-load speed command voltage; and determining the maximum duty ratio according to the proportionality coefficient, the rated full-load speed command voltage and the maximum starting speed command voltage.
5. The apparatus of claim 4, wherein the control module is specifically configured to: calculating a minimum start-up speed command voltage using a second formula comprising:
Vsp_min＝Kmin*Vsp_idl
wherein vsp_min is the minimum starting speed command voltage, kmin is the preset minimum ratio value, kmin has a value range of [0.6,1.0 ], and vsp_ idl is the rated no-load speed command voltage.
6. The apparatus of claim 4, wherein the control module is specifically configured to: calculating the minimum duty cycle using a third formula comprising:
Dmin＝D_star-(Vsp_star-Vsp_min)/K
wherein Dmin is the minimum duty cycle, d_star is the start duty cycle, vsp_star is the start speed command voltage, vsp_min is the minimum start speed command voltage, and K is the proportionality coefficient.
7. The apparatus of claim 4, wherein the control module is specifically configured to: calculating the maximum start-up speed command voltage using a fourth formula comprising:
Vsp_max＝Kmax*Vsp_full
wherein vsp_max is the maximum start-up speed command voltage, kmax is the preset maximum ratio value, kmax has a value range of [0.75,1.0 ], and vsp_full is the rated full-load speed command voltage.
8. The apparatus of claim 4, wherein the control module is specifically configured to: calculating the maximum duty cycle using a fifth formula, the fifth formula comprising:
Dmax＝100-(Vsp_full-Vsp_max)/K
where Dmax is the maximum duty ratio, vsp_full is the rated full-load speed command voltage, vsp_max is the maximum start-up speed command voltage, and K is a proportionality coefficient.
9. The apparatus of claim 1, wherein the apparatus further comprises: the pilot lamp, control module is still used for: and when the fan fails, the indicator lamp is lightened.
10. The apparatus of claim 1, wherein the periodically obtaining, in the control module, the actual rotation speed of the PG blower comprises: determining whether an external interrupt input signal is effective at a rising edge or effective at a falling edge, if the rising edge is effective, determining that the idle period level of the PG fan is low, and if the falling edge is effective, determining that the idle period level of the PG fan is high; and in the non-idle period, determining the actual rotating speed of the PG fan according to the number of feedback pulses received by an input port of the external interrupt input signal in one period.
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| CN202111140614.6A CN113653666B (en) | 2021-09-28 | 2021-09-28 | PG fan control device |
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