CN118050558A - Input voltage effective value acquisition method and device, air conditioning equipment and storage medium - Google Patents
Input voltage effective value acquisition method and device, air conditioning equipment and storage medium Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 79
- 238000004378 air conditioning Methods 0.000 title claims abstract description 12
- 238000012937 correction Methods 0.000 claims abstract description 35
- 238000005070 sampling Methods 0.000 claims description 25
- 230000008859 change Effects 0.000 claims description 15
- 238000004590 computer program Methods 0.000 claims description 13
- 230000006870 function Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 abstract description 8
- 239000003990 capacitor Substances 0.000 description 11
- 238000004364 calculation method Methods 0.000 description 9
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- 238000004891 communication Methods 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 5
- 230000000670 limiting effect Effects 0.000 description 3
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- 230000002159 abnormal effect Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 2
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/88—Electrical aspects, e.g. circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/02—Measuring effective values, i.e. root-mean-square values
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M5/00—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/40—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC
- H02M5/42—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters
- H02M5/44—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC
- H02M5/453—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal
- H02M5/458—Conversion of AC power input into AC power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into DC by static converters using discharge tubes or semiconductor devices to convert the intermediate DC into AC using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- Physics & Mathematics (AREA)
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Abstract
The application discloses a method and a device for acquiring an effective value of input voltage, air conditioning equipment and a storage medium. The method for acquiring the effective value of the input voltage comprises the following steps: acquiring on-off indication information of a Power Factor Correction (PFC), load power of the PFC and rectified voltage of a PFC power supply; and acquiring an effective value of the input voltage according to the opening and closing indication information, the load power and the rectified voltage. According to the method for acquiring the effective value of the input voltage, which is provided by the embodiment of the application, the on-off indication information of the PFC, the load power of the PFC and the rectified voltage of the PFC power supply are acquired, the effective value of the input voltage is acquired according to the on-off indication information, the load power and the rectified voltage, the acquisition process of the effective value of the input voltage is simpler, and the accuracy of the acquired effective value of the input voltage is higher.
Description
Technical Field
The invention relates to the field of electrical equipment, in particular to a method and a device for acquiring an effective value of input voltage, air conditioning equipment and a storage medium.
Background
The single-phase power factor correction circuit is widely applied to the fields of air conditioners, power supplies, frequency converters, new energy and the like due to the characteristics of simple structure, high efficiency in functions, capability of improving output voltage and the like. The single-phase power factor correction circuit generally needs to acquire an effective value of an input voltage for frequency limiting control and protection, the acquisition process of the effective value of the input voltage in the related technology is complex, the accuracy of an acquired result is low, and the technical problem needs to be solved.
Disclosure of Invention
The invention mainly aims to provide a method and a device for acquiring an effective value of input voltage, air conditioning equipment and a storage medium, and aims to solve the technical problems that the acquisition process of the effective value of the input voltage is complex and the accuracy of an acquired result is low in the related art.
To achieve the above objective, an embodiment of the present invention provides a method for obtaining an effective value of an input voltage of a power factor correction power supply, including:
Acquiring on-off indication information of a Power Factor Correction (PFC), load power of the PFC and rectified voltage of a PFC power supply;
And acquiring an effective value of the input voltage according to the opening and closing indication information, the load power and the rectified voltage.
Preferably, the obtaining the effective value of the input voltage according to the on/off indication information, the load power and the rectified voltage includes:
Judging whether the load power is equal to 0 or greater than 0 according to the PFC closing instruction information;
according to the load power equal to 0, adopting the ratio of the rectified voltage to a preset value as an effective value of the input voltage;
and according to the load power being larger than 0, keeping the effective value of the current input voltage not updated.
Preferably, the obtaining the effective value of the input voltage according to the on/off indication information, the load power and the rectified voltage includes:
opening PFC according to the opening and closing indication information, and acquiring the input power of the PFC;
And obtaining an effective value of the input voltage according to the load power, the input power and the rectified voltage.
Preferably, the obtaining an input voltage effective value according to the load power, the input power and the rectified voltage includes:
Acquiring an effective value of input voltage by adopting an effective value definition method according to the load power not less than a first preset load power threshold;
Acquiring an effective value of the input voltage by adopting an effective value definition method according to the load power which is less than or equal to a second preset load power threshold and the input power which is more than a preset starting threshold power; the second preset load power threshold is less than or equal to the first preset load power threshold;
The step of obtaining the effective value of the input voltage by adopting an effective value definition method comprises the following steps:
Sampling the rectified voltage for a preset number of times to obtain a sampling voltage value of each sampling;
calculating the square sum of the sampling voltage values of the preset number of times;
Calculating the sum of squares and the quotient of the preset number;
and calculating the arithmetic square root of the quotient to obtain the effective value of the input voltage.
Preferably, the obtaining an input voltage effective value according to the load power, the input power and the rectified voltage further includes:
According to the condition that the load power is less than or equal to a second preset load power threshold value and the input power is less than or equal to a preset starting threshold value power, keeping the effective value of the current input voltage not updated;
and according to the second preset load power threshold value < the load power < the first preset load power threshold value, keeping the current effective value of the input voltage not updated.
Preferably, the method for setting the preset starting threshold power includes:
Setting a preset starting threshold power as a first preset power according to the fact that the input voltage is more than or equal to 0 and less than a preset voltage value;
According to the preset power threshold, the preset power threshold corresponding to the current input voltage is calculated according to the preset power function relation between the preset power threshold and the input voltage and the current input voltage.
Preferably, the obtaining an input voltage effective value according to the load power, the input power and the rectified voltage further includes:
and according to the condition that the load power is less than or equal to a second preset load power threshold value and the input power is less than a preset closing threshold value power, keeping the current effective value of the input voltage not updated.
Preferably, the preset off threshold power is a difference value between the preset on threshold power and a preset power return difference.
Preferably, the power factor correction circuit is a multi-channel boost power factor correction circuit, and before the acquiring the working state information of the PFC circuit, the acquiring method further includes:
and responding to the channel number change, and adopting the last acquired effective value of the input voltage before the channel number change as the effective value of the input voltage in the preset time period from the time of the channel number change.
The embodiment of the invention also provides a device for acquiring the effective value of the input voltage of the power factor correction power supply, which comprises the following steps:
The working state information acquisition module is used for acquiring on-off indication information of the PFC circuit PFC, load power of the PFC and rectified voltage of the PFC power supply;
And the input voltage effective value acquisition module is used for acquiring an input voltage effective value according to the opening and closing indication information, the load power and the rectified voltage.
The embodiment of the application also provides air conditioning equipment, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the computer program to realize the method for acquiring the effective value of the input voltage of the power factor correction power supply according to any embodiment of the application.
The embodiment of the application also provides a computer readable storage medium, on which a computer program is stored, characterized in that the computer program is executed by a processor to implement the method for obtaining the effective value of the input voltage of the power factor correction power supply according to any embodiment of the application.
According to the technical scheme, the on-off indication information of the PFC, the load power of the PFC and the rectified voltage of the PFC power supply are obtained, the effective value of the input voltage is obtained according to the on-off indication information, the load power and the rectified voltage, the obtaining process of the effective value of the input voltage is simple, and the accuracy of the obtained effective value of the input voltage is high.
Drawings
In order to more clearly illustrate the embodiments of the present invention 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 only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic circuit diagram of a PFC power supply;
FIG. 2 is a flow chart of a method for obtaining the effective value of the input voltage of the PFC power supply according to some embodiments;
FIG. 3 is a flowchart of step S20 in some embodiments;
FIG. 4 is a flowchart of step S20 in some embodiments;
FIG. 5 is a schematic diagram of SwitchOnPower arrangements in some embodiments;
FIG. 6 is a VBD graph with PFC not on at idle in some embodiments;
FIG. 7 is a VBD graph illustrating light load after PFC is turned on in some embodiments;
FIG. 8 is a VBD graph illustrating a reload after PFC is turned on in some embodiments;
FIG. 9 is a schematic diagram of SwitchOnPower arrangements in some embodiments;
FIG. 10 is a graph of calculated Vac effective values for PFC switching repeatedly in some embodiments;
Fig. 11 is a block diagram of a device for obtaining an effective value of an input voltage of a pfc power supply according to some embodiments.
Fig. 12 is a block diagram of an air conditioning apparatus according to some embodiments.
FIG. 13 is a schematic diagram of a computer-readable storage medium of some embodiments.
Reference numerals illustrate:
the achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In addition, the technical solutions of the embodiments of the present invention may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the technical solutions, and when the technical solutions are contradictory or cannot be implemented, the combination of the technical solutions should be considered as not existing, and not falling within the scope of protection claimed by the present invention.
The power factor correction power supply includes interconnected rectifying circuits and a power factor correction circuit PFC (PFC, power Factor Correction). The power factor correction power supply is simply referred to as PFC power supply. Single-phase power factor correction circuits have been widely used. For example, a single-phase power factor correction circuit based on Boost-PFC (power factor correction circuit) has the characteristics of simple structure, high efficiency in function, capability of improving output voltage and the like, and has been widely applied to the fields of air conditioners, power supplies, frequency converters, new energy sources and the like. The single-phase boost pfc generally needs to sample the input voltage Vac to obtain the amplitude and phase information of the Vac to participate in loop control, two types of Vac sampling methods exist in the related art, one type of sampling method directly samples the ac voltage before rectification, and the sampling method can directly obtain the actual amplitude and phase information (including zero crossing point) of the Vac in real time at any time, but the sampling circuit needs a differential operational amplifier circuit, so that the hardware cost is relatively higher, and the accuracy of the effective value calculation result is not high. The other is that the sampling circuit samples the rectified DC side voltage VBD, the sampling circuit cannot acquire the actual amplitude and phase information (including zero crossing point) of the Vac at any time in real time, the Vac effective value is complex to calculate, and the accuracy of the calculation result is low.
Aiming at the technical problems that the acquisition process of the effective value of the input voltage is complex and the accuracy of the acquired result is insufficient in the related art, one embodiment of the application provides a method for acquiring the effective value of the input voltage of a power factor correction power supply, which is used for acquiring the on-off indication information of a PFC (power factor correction), the load power of the PFC and the rectified voltage of the PFC power supply, acquiring the effective value of the input voltage according to the on-off indication information, the load power and the rectified voltage, and has the advantages of simpler acquisition process of the effective value of the input voltage and higher accuracy of the acquired effective value of the input voltage.
The method for acquiring the effective value of the input voltage of the power factor correction power supply is applied to a PFC power supply of a power factor correction circuit, and in one embodiment, referring to FIG. 1, the PFC power supply comprises a power factor correction circuit 1, a rectifying circuit 2 and a capacitor Cbus. The rectifier circuit 2 is a rectifier bridge circuit. The power factor correction circuit 1 includes an inductance L1, a switching tube Q1, and a diode D1, wherein the switching tube Q1 is used as a switch to control on and off of the power factor correction circuit PFC, and in this example, the switching tube Q1 is an NMOS tube. The drain of the switching tube Q1 is connected to one end of the inductor L1 and the anode of the diode D1, respectively. The positive electrode of the capacitor Cbus is connected with the negative electrode of the diode D1, and the negative electrode of the capacitor Cbus is connected with the source electrode of the switching tube Q1. The other end of the inductor L1 is connected with the positive output end of the rectifier bridge circuit. The load 3 comprises a motor and a motor controller. The input voltage of the power supply of the power factor correction circuit is alternating voltage Vac. The capacitor Cbus may be an electrolytic capacitor. A resistor R1 is connected between the negative output end of the rectifier bridge circuit and the source electrode of the switching tube Q1. A resistor R2 is connected between the negative electrode of the capacitor Cbus and the load 3. The input voltage of the power supply of the power factor correction circuit is an alternating current input voltage Vac. A PTC thermistor is provided between the ac input voltage Vac and the rectifying circuit 1 in this example, and a delay switch Relay connected in parallel with the PTC thermistor is also provided. In operation, PFC is turned on by controlling the operation of switching tube Q1. The PFC specific operation in this example includes: when Q1 is turned on, current flows through Q1, inductance L1 is charged, inductance current is gradually increased, bus capacitor Cbus discharges to supply power to load 3, and capacitor voltage is reduced; when Q1 is turned off, current flows through the diode D1, the inductor L1 discharges to supply power to the bus capacitor Cbus and the load 3, the inductor current gradually decreases, the bus capacitor Cbus charges, and the capacitor voltage increases.
Referring to fig. 2, the method for obtaining the effective value of the input voltage of the pfc power supply according to the embodiment of the present application may include steps S10 and S20:
s10, acquiring on-off indication information of the PFC circuit PFC, load power of the PFC and rectified voltage of a PFC power supply.
Referring to fig. 1, on/off indication information of a PFC may be obtained through a gate of a switching tube Q1, thereby determining whether the PFC is on or off; the rectified voltage of the PFC power supply is the dc side voltage VBD rectified by the rectifying circuit 2.
S20, obtaining an effective value of the input voltage according to the opening and closing indication information, the load power and the rectified voltage.
Referring to fig. 3, in some embodiments, obtaining the effective value of the input voltage according to the on/off indication information, the load power, and the rectified voltage may include:
S2011, judging whether the load power is equal to 0 or greater than 0 according to the PFC closing instruction information.
S2012, according to the load power equal to 0, the ratio of the rectified voltage to the preset value is used as the effective value of the input voltage.
The preset value may be, for exampleThe values can be specifically selected according to the actual application requirements. For example, when the load power is equal to 0, i.e., no load, the calculation formula of the input voltage effective value vac_rms is as follows, since the rectified dc side voltage VBD is equal to the bus voltage Vdc, i.e., the rectified voltage is equal to the bus voltage VdcThe preset value is/>, in this exampleNo load refers to the situation where the PFC back end is not loaded or the load power is near 0.
S2013, according to the fact that the load power is larger than 0, keeping the current effective value of the input voltage not updated.
For example, in the case where PFC is off but there is a load (i.e., the load power is greater than 0), the rectified dc side voltage VBD is still equal to the bus voltage Vdc, but the bus voltage Vdc is reduced from standby (the standby state is the same as the idle state), so the input voltage effective value vac_rms may be kept as the input voltage effective value in the idle state without updating, and the input voltage effective value in the idle state is the ratio of the rectified voltage to the preset value. Therefore, in the case of PFC shutdown but with load, the ratio of the rectified voltage to the preset value is also used as the input voltage effective value.
Referring to fig. 4, in some embodiments, obtaining the effective value of the input voltage according to the on/off indication information, the load power, and the rectified voltage may include:
S2021, opening PFC according to the opening and closing indication information, and acquiring the input power of the PFC;
S2022, obtaining an effective value of the input voltage according to the load power, the input power and the rectified voltage.
In some embodiments, deriving the input voltage effective value from the load power, the input power, and the rectified voltage may include:
acquiring an effective value of the input voltage by adopting an effective value definition method according to the condition that the load power is more than or equal to a first preset load power threshold value;
according to the condition that the load power is less than or equal to a second preset load power threshold value and the input power is more than a preset starting threshold power, an effective value definition method is adopted to obtain an effective value of the input voltage; the second preset load power threshold is less than or equal to the first preset load power threshold;
The obtaining the effective value of the input voltage by using the effective value definition method may include: sampling the rectified voltage for a preset number of times to obtain a sampling voltage value of each sampling; calculating the square sum of sampling voltage values of a preset number of times; calculating the quotient of the square sum and the preset number; the arithmetic square root of the quotient is calculated to obtain the effective value of the input voltage.
Illustratively, the significance definition method may be described as: the preset number is recorded as n, the sampling voltage value of each sampling is recorded as U m, wherein m is more than or equal to 1 and less than or equal to n, and the calculation formula of the effective value Vac_rms of the input voltage isN may be set to, for example, 10, 20, 30, etc.
Illustratively, in the case where PFC has been turned on and is heavily loaded (heavy load, i.e., the case where the load power is greater than or equal to the first preset load power threshold value), since the rectified dc side voltage VBD has completely changed to the steamed bread wave shape, the input voltage effective value vac_rms is calculated using an effective value definition method; the heavy load means that the back end of the PFC is provided with a load with larger power, namely the load power is larger than or equal to a first preset load power threshold value. The significance definition method can be described as follows:
The maximum sum of squares accumulation number c_max is required to be associated with the power supply frequency, because the effective value in the whole number of steamed bread wave periods is accurate to be calculated, and the even number of steamed bread waves is preferable, and if the effective value in the n steamed bread wave periods needs to be calculated each time, the algorithm interruption frequency is fs, and the steamed bread wave frequency is f, then c_max=n fs/f. The active value accumulation calculation needs to be placed in the fast loop interrupt and the evolution action is placed in the slow loop interrupt (e.g., one evolution per 1ms calculation) in order to save fast loop interrupt execution time.
In some embodiments, obtaining the input voltage effective value from the load power, the input power, and the rectified voltage may further include:
According to the condition that the load power is less than or equal to a second preset load power threshold value and the input power is less than or equal to a preset starting threshold power, keeping the effective value of the current input voltage not updated;
And according to the second preset load power threshold value < load power < the first preset load power threshold value, keeping the effective value of the current input voltage not updated.
Illustratively, according to the load power being less than or equal to a second preset load power threshold value and the input power being less than a preset closing threshold power, keeping the current effective value of the input voltage not updated; and according to the condition that the load power is less than or equal to a second preset load power threshold value, and the preset off threshold power is less than or equal to the input power and less than or equal to the preset on threshold power, keeping the current effective value of the input voltage not updated.
In some embodiments, the method for setting the preset on threshold power may include:
Setting a preset starting threshold power as a first preset power according to the fact that the input voltage is more than or equal to 0 and less than a preset voltage value;
according to the preset power threshold, the preset power threshold corresponding to the current input voltage is calculated.
In some embodiments, the preset off threshold power is the difference between the preset on threshold power and the preset power return difference.
In some embodiments, obtaining the input voltage effective value from the load power, the input power, and the rectified voltage may further include: and according to the condition that the load power is less than or equal to a second preset load power threshold value and the input power is less than a preset closing threshold value power, keeping the effective value of the current input voltage not updated.
For example, in the case where PFC is already on and lightly loaded (light load is the case where the load power is less than or equal to the second preset load power threshold value), since the input power is smaller when the input power is less than or equal to the preset on threshold power, the rectified dc side voltage VBD is not yet completely changed into a steamed bread wave, and in this case, if the effective value definition method is directly used to calculate the effective value vac_rms of the input voltage, the obtained result is larger. To this end, the present example obtains an input voltage effective value from the load power and the on and off threshold powers. The on threshold power SwitchOnPower and the off threshold power SwitchOffPower are preset, i.e., switchOnPower is the preset on threshold power and SwitchOffPower is the preset off threshold power. When the input power exceeds the starting threshold power SwitchOnPower, calculating an effective value by adopting an effective value definition method; when the input power is less than the off threshold power SwitchOffPower, the current valid value is kept not updated.
The setting manner of the preset on threshold Power SwitchOnPower is shown in fig. 5, where SwitchOnPower =power1, and Power1 is the first preset Power when the input voltage is equal to or less than 0 and less than the preset voltage value Vac 1.
The preset first power function between the preset on threshold power and the input voltage can be expressed as:
SwitchOnPower = power1+ (Power 2-Power 1) x (Vac-Vac 1)/(Vac 2-Vac 1); wherein Vac is equal to or greater than Vac1, (Vac 2, power 2) is a known coordinate value, vac2 is a known voltage value, and Power2 is a known Power value. For example, (Vac 1, power 1) is (220 v,300 w), (Vac 2, power 2) is (270 v,700 w); (Vac 1, power 1) is (225 v,310 w), (Vac 2, power 2) is (275 v,710 w); (Vac 1, power 1) is (240 v,320 w), (Vac 2, power 2) is (284 v,720 w); and the like, and specific values can be set according to actual application requirements.
In a preset Power-on-threshold Power versus input voltage, switchOnPower =power2 when the input voltage Vac is equal to Vac 2.
When the input voltage Vac is equal to or greater than the preset voltage value Vac1, the corresponding SwitchOnPower is calculated by linear interpolation of SwitchOnPower =power1+ (Power 2-Power 1)/(Vac-Vac 1)/(Vac 2-Vac 1). The four parameters Vac1, vac2, power1 and Power2 are related to the hardware circuit and can be selected through actual measurement effect.
Preset shutdown threshold power SwitchOffPower = SwitchOnPower-DeltaPower, where DeltaPower is a preset power return difference.
In some embodiments, before the obtaining the operating state information of the PFC circuit according to the PFC circuit being a multi-channel boost PFC circuit, the obtaining method further includes: and responding to the channel number change, and adopting the last acquired effective value of the input voltage before the channel number change as the effective value of the input voltage in the preset time period from the time of the channel number change.
For example, if the PFC is a multi-channel Boost type PFC, the effective value vac_rms of the input voltage at the previous time is not updated for a preset period (e.g., 5 s) when the number of channels is changed, and is updated after the preset period (e.g., 5 s) has elapsed. The preset time length can be, for example, 5s, 6s, 7s, etc., and can be specifically set according to actual application needs.
The accuracy of the obtained result of the effective value of the input voltage in the related technology is not high, the accuracy of the input voltage is affected, and the condition that the electric control components are damaged due to abnormal input voltage is easy to occur. According to the method for acquiring the effective value of the input voltage of the power factor correction power supply, the accuracy of the acquired effective value of the input voltage is high, so that the control accuracy of the input voltage is improved, and the occurrence probability of the condition that an electronic control component is damaged due to the abnormal input voltage is greatly reduced.
In a specific example of the method for obtaining the effective value of the input voltage of the power factor correction power supply, a single-channel Boost-PFC is adopted, the PFC is not turned on during standby, the state during standby is no-load state, the voltage waveform of the rectified voltage VBD is the voltage waveform of the bus voltage Vdc, and the curve S shown in fig. 6 is a VBD curve. The Vac effective value is calculated at this time using the calculation formula vac_rms=vdc/∈2. When the PFC is loaded before turning on, vdc will decrease, so the effective value of the input voltage calculated at standby (i.e., no load) is not updated.
When the PFC is under light load (light load is that the load power is less than or equal to the second preset load power threshold value), the voltage waveform of the VBD is a special waveform with different width between the direct current and the steamed bread wave, such as curve S shown in fig. 7, that is, the VBD curve. At this time, the input power is smaller than the preset closing threshold power SwitchOffPower, and the last calculated effective value is kept not updated.
When the PFC is turned on and then overloaded (i.e., when the load power is greater than or equal to the first preset load power threshold), the voltage waveform of the VBD is completely changed into a steamed bread waveform, as shown in fig. 8, which is a curve S, i.e., a VBD curve. At this time, the input power is greater than or equal to the preset opening threshold power SwitchOnPower, and the Vac effective value is calculated by adopting an effective value definition method.
If PFC is started, in the process of reducing the load from heavy load to light load, when the input power is smaller than SwitchOffPower, the effective value calculated last time is kept not updated.
SwitchOnPower is set as shown in fig. 9, when the input voltage is below 220V, switchOnPower =300w, when the input voltage is equal to 270V, switchOnPower =700w, and when the input voltage is equal to other voltages, corresponding SwitchOnPower, that is, switchOnPower =300w+ (700W-300W)/(270V-220V), is calculated by linear interpolation.
SwitchOffPower = SwitchOnPower-50w,50w being the set power return difference.
In this example, the load is 2300W fan, the fan is frequently started and tested (frequency-up and frequency-down are performed and finally shut down), as shown in fig. 10, PFC is repeatedly switched (PFC on condition is that the power exceeds 300W, and off condition is that the power is less than 200W), and bus voltage Vdc is continuously increased and decreased (PFC target voltage is 380V), but the calculated Vac effective value is basically stabilized at 225V, the actual power voltage is 226V, the accuracy is very high, and no abrupt change exists, which proves the effectiveness of the method of this embodiment.
The method for acquiring the effective value of the input voltage of the power factor correction power supply adopts a single-phase Boost-PFC input voltage effective value calculation scheme based on the rectified DC side voltage VBD sampling, adopts different effective value calculation methods according to the variation conditions of the rectified DC side voltage VBD under different loads and different power supply voltages, and designs a switching mode so that the obtained effective value of the input voltage is more accurate and abrupt change cannot occur. The obtained effective value of the input voltage can be applied to more accurately supplying power to a load, so that the function of protecting the input voltage from abnormality is realized, and the damage of related electric control components caused by the abnormality (such as overhigh or overlow) of the input voltage is reduced. The obtained effective value of the input voltage is accurate, and the input voltage frequency limiting logic can be accurately executed according to the obtained effective value of the input voltage, for example, when the effective value of the input voltage is low, the operation frequency of a load (such as a compressor or a fan) is limited, so that the occurrence probability of shutdown caused by overcurrent protection of the input current is reduced.
Referring to fig. 11, another embodiment of the present application provides a device for obtaining an effective value of an input voltage of a power factor correction power supply, including:
the working state information acquisition module is used for acquiring on-off indication information of the PFC circuit PFC, load power of the PFC and rectified voltage of the PFC power supply;
the input voltage effective value acquisition module is used for acquiring the input voltage effective value according to the opening and closing indication information, the load power and the rectified voltage.
In some embodiments, the input voltage effective value acquisition module includes:
The judging unit is used for judging whether the load power is equal to 0 or greater than 0 according to PFC closing;
The calculating unit is used for adopting the ratio of the rectified voltage to the preset value as an effective value of the input voltage according to the fact that the load power is equal to 0;
The calculating unit is further used for keeping the current effective value of the input voltage not updated according to the fact that the load power is larger than 0.
In some embodiments, the input voltage effective value acquisition module includes:
The input power acquisition unit is used for acquiring the input power of the PFC according to the start of the PFC;
and the input voltage effective value acquisition unit is used for acquiring the input voltage effective value according to the load power, the input power and the rectified voltage.
In some embodiments, the input voltage effective value obtaining unit is further specifically configured to:
acquiring an effective value of the input voltage by adopting an effective value definition method according to the condition that the load power is more than or equal to a first preset load power threshold value;
according to the condition that the load power is less than or equal to a second preset load power threshold value and the input power is more than a preset starting threshold power, an effective value definition method is adopted to obtain an effective value of the input voltage; the second preset load power threshold is less than or equal to the first preset load power threshold;
The method for obtaining the effective value of the input voltage by adopting the effective value definition method comprises the following steps: sampling the rectified voltage for a preset number of times to obtain a sampling voltage value of each sampling; calculating the square sum of sampling voltage values of a preset number of times; calculating the quotient of the square sum and the preset number; the arithmetic square root of the quotient is calculated to obtain the effective value of the input voltage.
In some embodiments, the input voltage effective value obtaining unit is further specifically configured to:
According to the condition that the load power is less than or equal to a second preset load power threshold value and the input power is less than or equal to a preset starting threshold power, keeping the effective value of the current input voltage not updated;
And according to the second preset load power threshold value < load power < the first preset load power threshold value, keeping the effective value of the current input voltage not updated.
In some embodiments, the input voltage effective value obtaining unit is further specifically configured to set a preset starting threshold power; the method for setting the preset starting threshold power comprises the following steps:
Setting a preset starting threshold power as a first preset power according to the fact that the input voltage is more than or equal to 0 and less than a preset voltage value;
according to the preset power threshold, the preset power threshold corresponding to the current input voltage is calculated.
In some embodiments, the input voltage effective value obtaining unit is further specifically configured to: and according to the condition that the load power is less than or equal to a second preset load power threshold value and the input power is less than a preset closing threshold value power, keeping the effective value of the current input voltage not updated.
In some embodiments, the preset off threshold power is the difference between the preset on threshold power and the preset power return difference.
In some embodiments, the input voltage valid value acquisition module is further to: and responding to the channel number change before the working state information of the PFC circuit is acquired according to the fact that the PFC circuit is a multi-channel boosting type PFC circuit, and taking the last acquired effective value of the input voltage before the channel number change as the effective value of the input voltage in the preset time period from the time of the channel number change.
According to the input voltage effective value acquisition device provided by the embodiment of the application, the on-off indication information of the PFC, the load power of the PFC and the rectified voltage of the PFC power supply are acquired, the input voltage effective value is acquired according to the on-off indication information, the load power and the rectified voltage, the acquisition process of the input voltage effective value is simpler, and the acquired input voltage effective value is higher in accuracy.
Another embodiment of the present application provides an air conditioning apparatus, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor executes the computer program to implement the method according to any one of the foregoing embodiments.
Referring to fig. 12, the air conditioning apparatus 10 may include: processor 100, memory 101, bus 102 and communication interface 103, processor 100, communication interface 103 and memory 101 being connected by bus 102; the memory 101 stores a computer program executable on the processor 100, which when executed by the processor 100 performs the method provided by any of the previous embodiments of the application.
The memory 101 may include a high-speed random access memory (RAM: random Access Memory), and may further include a non-volatile memory (non-volatile memory), such as at least one disk memory. The communication connection between the device network element and the at least one other network element is achieved through at least one communication interface 103 (which may be wired or wireless), the internet, a wide area network, a local network, a metropolitan area network, etc. may be used.
Bus 102 may be an ISA bus, a PCI bus, an EISA bus, or the like. The buses may be divided into address buses, data buses, control buses, etc. The memory 101 is configured to store a program, and the processor 100 executes the program after receiving an execution instruction, and the method disclosed in any of the foregoing embodiments of the present application may be applied to the processor 100 or implemented by the processor 100.
The processor 100 may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method may be performed by integrated logic circuits of hardware in the processor 100 or by instructions in the form of software. The processor 100 may be a general-purpose processor, and may include a central processing unit (Central Processing Unit, abbreviated as CPU), a network processor (Network Processor, abbreviated as NP), and the like; but may also be a Digital Signal Processor (DSP), application Specific Integrated Circuit (ASIC), an off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present application may be embodied directly in the execution of a hardware decoding processor, or in the execution of a combination of hardware and software modules in a decoding processor. The software modules may be located in a random access memory, flash memory, read only memory, programmable read only memory, or electrically erasable programmable memory, registers, etc. as well known in the art. The storage medium is located in the memory 101, and the processor 100 reads the information in the memory 101 and, in combination with its hardware, performs the steps of the method described above.
The air conditioning equipment provided by the embodiment of the application and the method provided by the embodiment of the application have the same beneficial effects as the method adopted, operated or realized by the air conditioning equipment.
Another embodiment of the present application provides a computer readable storage medium having stored thereon a computer program that is executed by a processor to implement a method according to any of the above embodiments. Referring to fig. 13, a computer readable storage medium is shown as an optical disc 20 having a computer program (i.e., a program product) stored thereon, which, when executed by a processor, performs the method provided by any of the embodiments described above.
It should be noted that examples of the computer readable storage medium may also include, but are not limited to, a phase change memory (PRAM), a Static Random Access Memory (SRAM), a Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), a Read Only Memory (ROM), an Electrically Erasable Programmable Read Only Memory (EEPROM), a flash memory, or other optical or magnetic storage medium, which will not be described in detail herein.
The computer-readable storage medium provided by the above-described embodiments of the present application has the same advantageous effects as the method adopted, operated or implemented by the application program stored therein, for the same inventive concept as the method provided by the embodiments of the present application.
The foregoing description of the preferred embodiments of the present invention should not be construed as limiting the scope of the invention, but rather utilizing equivalent structural changes made in the present invention description and drawings or directly/indirectly applied to other related technical fields are included in the scope of the present invention.
Claims (12)
1. A method for obtaining an effective value of an input voltage of a power factor correction power supply, comprising:
Acquiring on-off indication information of a Power Factor Correction (PFC), load power of the PFC and rectified voltage of a PFC power supply;
And acquiring an effective value of the input voltage according to the opening and closing indication information, the load power and the rectified voltage.
2. The method of claim 1, wherein the obtaining an input voltage effective value based on the on-off indication information, the load power, and the rectified voltage comprises:
Judging whether the load power is equal to 0 or greater than 0 according to the PFC closing instruction information;
according to the load power equal to 0, adopting the ratio of the rectified voltage to a preset value as an effective value of the input voltage;
and according to the load power being larger than 0, keeping the effective value of the current input voltage not updated.
3. The method according to claim 1 or 2, wherein the obtaining an input voltage effective value according to the on-off indication information, the load power, and the rectified voltage includes:
opening PFC according to the opening and closing indication information, and acquiring the input power of the PFC;
And obtaining an effective value of the input voltage according to the load power, the input power and the rectified voltage.
4. The method of claim 3, wherein said deriving an input voltage effective value from said load power, said input power, and said rectified voltage comprises:
Acquiring an effective value of input voltage by adopting an effective value definition method according to the load power not less than a first preset load power threshold;
Acquiring an effective value of the input voltage by adopting an effective value definition method according to the load power which is less than or equal to a second preset load power threshold and the input power which is more than a preset starting threshold power; the second preset load power threshold is less than or equal to the first preset load power threshold;
The step of obtaining the effective value of the input voltage by adopting an effective value definition method comprises the following steps:
Sampling the rectified voltage for a preset number of times to obtain a sampling voltage value of each sampling;
calculating the square sum of the sampling voltage values of the preset number of times;
Calculating the sum of squares and the quotient of the preset number;
and calculating the arithmetic square root of the quotient to obtain the effective value of the input voltage.
5. The method of claim 4, wherein the obtaining an input voltage effective value from the load power, the input power, and the rectified voltage further comprises:
According to the condition that the load power is less than or equal to a second preset load power threshold value and the input power is less than or equal to a preset starting threshold value power, keeping the effective value of the current input voltage not updated;
and according to the second preset load power threshold value < the load power < the first preset load power threshold value, keeping the current effective value of the input voltage not updated.
6. The method of claim 4, wherein the method for setting the preset turn-on threshold power comprises:
Setting a preset starting threshold power as a first preset power according to the fact that the input voltage is more than or equal to 0 and less than a preset voltage value;
According to the preset power threshold, the preset power threshold corresponding to the current input voltage is calculated according to the preset power function relation between the preset power threshold and the input voltage and the current input voltage.
7. The method of claim 4, wherein the obtaining an input voltage effective value from the load power, the input power, and the rectified voltage further comprises:
and according to the condition that the load power is less than or equal to a second preset load power threshold value and the input power is less than a preset closing threshold value power, keeping the current effective value of the input voltage not updated.
8. The method of claim 7, wherein the preset off threshold power is a difference between the preset on threshold power and a preset power return difference.
9. The method of claim 1, wherein the acquiring method further comprises, prior to the acquiring the operating state information of the PFC circuit PFC, according to the PFC circuit being a multi-channel boost type PFC circuit:
and responding to the channel number change, and adopting the last acquired effective value of the input voltage before the channel number change as the effective value of the input voltage in the preset time period from the time of the channel number change.
10. A power factor correction power supply input voltage effective value acquisition device, characterized by comprising:
The working state information acquisition module is used for acquiring on-off indication information of the PFC circuit PFC, load power of the PFC and rectified voltage of the PFC power supply;
And the input voltage effective value acquisition module is used for acquiring an input voltage effective value according to the opening and closing indication information, the load power and the rectified voltage.
11. An air conditioning apparatus comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor executing the computer program to implement the method of obtaining a power factor correction power supply input voltage effective value as claimed in any one of claims 1 to 9.
12. A computer-readable storage medium having stored thereon a computer program, wherein the computer program is executed by a processor to implement the power factor correction power supply input voltage effective value acquisition method according to any one of claims 1 to 9.
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| CN119044588A (en) * | 2024-11-01 | 2024-11-29 | 广东美的暖通设备有限公司 | Method and device for calculating effective value of input voltage of single-phase power factor correction circuit |
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| CN119044588A (en) * | 2024-11-01 | 2024-11-29 | 广东美的暖通设备有限公司 | Method and device for calculating effective value of input voltage of single-phase power factor correction circuit |
| CN119044588B (en) * | 2024-11-01 | 2025-01-21 | 广东美的暖通设备有限公司 | Method and device for calculating effective value of input voltage of single-phase power factor correction circuit |
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