CN112432310A - Power factor calibration system, method, processor, compressor, air conditioner and medium - Google Patents

Power factor calibration system, method, processor, compressor, air conditioner and medium Download PDF

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Publication number
CN112432310A
CN112432310A CN202011148782.5A CN202011148782A CN112432310A CN 112432310 A CN112432310 A CN 112432310A CN 202011148782 A CN202011148782 A CN 202011148782A CN 112432310 A CN112432310 A CN 112432310A
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input
limit value
relay
air conditioner
compressor
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CN112432310B (en
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雷龙
郭清风
许敏
宋泽琳
方明占
谭厚志
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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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
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/46—Improving electric energy efficiency or saving
    • F24F11/47—Responding to energy costs
    • 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
    • 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
    • F24F11/65—Electronic processing for selecting an operating mode
    • 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
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)
  • Rectifiers (AREA)

Abstract

The invention belongs to the technical field of circuit control and discloses a power factor calibration system, a power factor calibration method, a processor, a compressor, an air conditioner and a mediumTAnd input current limit ITWhen the input voltage is less than VTAnd the input current is less than ITWhen the relay K1 is closed, the relay K1 is closed. The invention can effectively solve the problem of larger loss of the controller when the compressor operates at low frequency. The power factor check circuit topology control method provided by the invention enables the relay K1 to select a type with lower voltage and lower current gradeThe size of the device can be effectively reduced, and the material cost can be reduced; the loss generated by the conduction voltage drop of the relay is far less than the loss generated by the inductance L inductive reactance and the diode D voltage drop, and the low power consumption of the circuit is realized.

Description

Power factor calibration system, method, processor, compressor, air conditioner and medium
Technical Field
The invention belongs to the technical field of circuit control, and particularly relates to a power factor calibration system, a power factor calibration method, a power factor calibration processor, a compressor, an air conditioner and a medium.
Background
At present, most modern household electrical appliance controllers adopt a Power Factor Correction (PFC) technology, so that the current harmonic value is greatly reduced, the pollution to a power grid is reduced, and the quality of the power grid is improved. PFC circuits based on Boost topology are common. When the compressor of the air conditioner external unit operates at a low frequency, the power of the whole machine is low, the PFC driving signal can be turned off during actual control, and the loss of the controller can be increased by inductance and diode voltage drop in a Boost circuit at the moment.
Through the above analysis, the problems and defects of the prior art are as follows: the controller loss is large when the compressor is operated at a low frequency. Can not reduce the power consumption of the whole machine
The difficulty in solving the above problems and defects is:
the desire of the existing household appliances to reduce power consumption is never stopped, and further power saving is increasingly difficult.
The significance of solving the problems and the defects is as follows:
the invention reduces the power consumption of the whole machine, saves electricity and energy.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a power factor calibration system, a power factor calibration method, a processor, a compressor, an air conditioner and a medium.
The invention is realized in such a way that a low-power-consumption power factor calibration method comprises the following steps:
when the compressor of the air conditioner external unit operates at a low frequency, the processor drives signals to be closed, an input voltage limit value and an input current limit value are determined according to an input minimum voltage and an input minimum current sampling signal, and when the input real-time voltage and current are smaller than the determined input voltage limit value and input current limit value, the relay is controlled to be attracted.
Further, the power factor calibration method with low power consumption specifically includes:
step one, judging whether the running frequency of an air conditioner external compressor is greater than a threshold value fT(ii) a If the running frequency of the air conditioner external compressor is greater than the threshold value fTTurning to the second step; if the running frequency of the air conditioner external compressor is less than or equal to the threshold value fTTurning to the third step;
step two, when the running frequency of the air conditioner external compressor is greater than a threshold value fTWhen the relay is started, the PFC driving signal is started, and the relay K1 is disconnected;
step three, when the running frequency of the air conditioner external compressor is less than or equal to a threshold value fT, the PFC driving signal is closed; and judging whether the input current Iin is smaller than the current limit value IT(ii) a And executing corresponding processing based on the judgment result;
and step four, returning to the step one, and executing the next-stage judgment.
Further, in step three, the performing the corresponding processing based on the determination result includes:
if the input current Iin is larger than or equal to the current limit value ITThe relay is disconnected;
if the input current Iin is less than the current limit value ITThen detecting whether the input voltage is less than the voltage limit value VT(ii) a If the input voltage is less than the voltage limit value VTThen the relay K1 is closed; if the input voltage is greater than or equal to the voltage limit value VTThen the relay K1 is opened.
Another object of the present invention is to provide the power factor checking method with low power consumption, wherein the relay is a switching device with low conduction loss.
Another object of the present invention is to provide a low power consumption power factor verification system implementing the low power consumption power factor verification method, the low power consumption power factor verification system including a core control unit MCU;
the core control unit MCU includes:
for using digital signal processing coresChip or high-speed processor, above a certain frequency threshold f when the compressor of the air conditioner external unit is operating at medium-high frequencyTStarting a driving signal control U1 to realize the PFC of the main circuit; at the same time, when the compressor of the air conditioner outer unit operates at low frequency, namely, is lower than a certain frequency threshold value fTAnd when the power of the whole machine is lower, the PFC driving signal is turned off, and the input voltage limit value V is set according to the input voltage Vin and the input current Iin sampling signalTAnd input current limit ITWhen the input voltage is less than VTAnd the input current is less than ITWhen the input voltage and the input current do not meet the requirements, the relay K1 is closed, and the relay is disconnected.
Another object of the present invention is to provide a processor for an air conditioner, wherein the processor performs the following steps:
step 1, judging whether the operating frequency of an external air conditioner compressor is greater than a threshold value fT(ii) a If the running frequency of the air conditioner external compressor is greater than the threshold value fTTurning to step 2; if the running frequency of the air conditioner external compressor is less than or equal to the threshold value fTTurning to step 3;
step 2, when the running frequency of the air conditioner external compressor is greater than a threshold value fTWhen the relay is started, the PFC driving signal is started, and the relay K1 is disconnected;
step 3, when the running frequency of the air conditioner external compressor is less than or equal to a threshold value fT, closing the PFC driving signal; and judging whether the input current Iin is smaller than the current limit value IT(ii) a And executing corresponding processing based on the judgment result;
and 4, returning to the step 1, and executing the next stage of judgment.
Another object of the present invention is to provide a compressor applied to an air conditioner, wherein the processor is mounted on the compressor, the processor drives the signal off when the compressor operates at a low frequency, determines an input voltage limit value and an input current limit value according to an input minimum voltage and an input minimum current sampling signal, and controls the relay to be closed when an input real-time voltage and an input current are smaller than the determined input voltage limit value and the determined input current limit value.
Another object of the present invention is to provide an air conditioner, wherein the air conditioner is equipped with the compressor, when the compressor operates at a low frequency, the processor drives the signal to turn off, determines an input voltage limit value and an input current limit value according to an input minimum voltage and an input minimum current sampling signal, and controls the relay to be closed when an input real-time voltage and an input current are smaller than the determined input voltage limit value and the determined input current limit value.
It is another object of the present invention to provide a computer-readable storage medium storing a computer program which, when executed by a processor, causes the processor to perform the steps of:
when the air conditioner compressor runs at a low frequency, the processor drives the signal to be closed, determines an input voltage limit value and an input current limit value according to an input minimum voltage and an input minimum current sampling signal, and controls the relay to be attracted when the input real-time voltage and current are smaller than the determined input voltage limit value and input current limit value.
By combining all the technical schemes, the invention has the advantages and positive effects that:
the invention reduces the controller loss when the compressor operates at low frequency, thereby reducing the power consumption of the whole machine. The controller is attracted by the relay at lower voltage and lower current, so that the relay K1 can select the model with lower voltage and lower current grade, the size of the device can be effectively reduced, and the material cost can be reduced.
The invention provides a novel power factor calibration circuit topology, which can effectively solve the problem that the loss of a controller is large when a compressor runs at a low frequency.
The power factor check circuit topology control method provided by the invention enables the relay K1 to select a model with lower voltage and lower current grade, and can effectively reduce the volume of a device and reduce the material cost; the loss generated by the conduction voltage drop of the relay is far less than the loss generated by the inductance L inductive reactance and the diode D voltage drop, and the low power consumption of the circuit is realized.
The relay K1 can be selected from a model with lower voltage and lower current grade, so that the volume of the device and the material cost can be effectively reduced; the loss generated by the conduction voltage drop of the relay is far less than the loss generated by the inductance L inductive reactance and the diode D voltage drop, and the low power consumption of the circuit is realized.
Technical effect or experimental effect of comparison. The method comprises the following steps:
generally, a PFC inductor is about 500uH, a line resistance is 60m Ω, a diode conduction voltage is 1.2V, a relay coil working loss is 0.5W, and assuming that a current is 5A when a press operates at a low frequency, then: the relay losses 0.5W, while the inductive losses and diode conduction losses 7W, reduce the losses by 6.5W.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without creative efforts.
Fig. 1 is a schematic diagram of a power factor calibration method with low power consumption according to an embodiment of the present invention.
Fig. 2 is a flowchart of a power factor checking method with low power consumption according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a basic topology of a Boost-based PFC according to an embodiment of the present invention.
Fig. 4 is a schematic diagram of an optimal embodiment of the power factor checking system with low power consumption according to the embodiment of the present invention.
Fig. 5 is a control flow chart of the preferred embodiment provided by the embodiment of the invention.
Fig. 6 is a schematic diagram illustrating a short circuit of the diode D when the PFC driving signal is turned off according to an embodiment of the present invention.
Fig. 7 is a schematic diagram illustrating the short circuit of the inductor L when the PFC driving signal is turned off according to an embodiment of the present invention.
Fig. 8 is a schematic diagram illustrating the current flowing from the diode D1 when the PFC driving signal is turned off according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In view of the problems in the prior art, the present invention provides a power factor calibration system, method, processor, compressor, air conditioner and medium, which will be described in detail with reference to the accompanying drawings.
The low-power-consumption power factor calibration method provided by the embodiment of the invention comprises the following steps:
when the compressor of the air conditioner external unit operates at a low frequency, the PFC driving signal is turned off, and the input voltage limit value V is set according to the input voltage Vin and the input current Iin sampling signalTAnd input current limit ITWhen the input voltage is less than VTAnd the input current is less than ITWhen the relay K1 is closed, the relay K1 is closed.
As shown in fig. 1, the power factor calibration method with low power consumption provided by the embodiment of the present invention includes the following steps:
s101, judging whether the operating frequency of the external air conditioner compressor is greater than a threshold value fT(ii) a If the running frequency of the air conditioner external compressor is greater than the threshold value fTIf yes, go to step S102; if the running frequency of the air conditioner external compressor is less than or equal to the threshold value fTThen, go to step S103;
s102, when the running frequency of the air conditioner external compressor is greater than a threshold value fTWhen the relay is started, the PFC driving signal is started, and the relay K1 is disconnected;
s103, when the running frequency of the air conditioner external compressor is less than or equal to a threshold value fT, the PFC driving signal is turned off; and judging whether the input current Iin is smaller than the current limit value IT(ii) a And executing corresponding processing based on the judgment result;
s104, returning to the step S101, and executing the next stage judgment.
In step S103, the executing of the corresponding processing based on the determination result provided by the embodiment of the present invention includes:
if the input current Iin is larger than or equal to the current limit value ITThe relay is disconnected;
if the input current Iin is less than the current limit value ITThen detecting whether the input voltage is less than the voltage limit value VT(ii) a If inputting electricityVoltage less than voltage limit VTThen the relay K1 is closed; if the input voltage is greater than or equal to the voltage limit value VTThen the relay K1 is opened.
The relay provided by the embodiment of the invention can be other switching devices with low conduction loss.
The low-power-consumption power factor verification system provided by the embodiment of the invention comprises a core control unit MCU.
The core control unit MCU provided by the embodiment of the invention comprises:
for using digital signal processing chip or high-speed processor, when the compressor of the air conditioner external machine is operated at medium-high frequency, i.e. higher than a certain frequency threshold value fTStarting a driving signal control U1 to realize the PFC of the main circuit; at the same time, when the compressor of the air conditioner outer unit operates at low frequency, namely, is lower than a certain frequency threshold value fTAnd when the power of the whole machine is lower, the PFC driving signal is turned off, and the input voltage limit value V is set according to the input voltage Vin and the input current Iin sampling signalTAnd input current limit ITWhen the input voltage is less than VTAnd the input current is less than ITWhen the input voltage and the input current do not meet the requirements, the relay K1 is closed, and the relay is disconnected.
The technical effects of the present invention will be further described with reference to specific embodiments.
Example 1:
as shown in fig. 3, the most common PFC topology circuit is currently used, when the compressor of the external air conditioner runs at a low frequency, the power of the whole machine is low, the PFC driving signal is turned off during actual control, and the loss of the controller is increased by inductance and diode voltage drop in the Boost circuit.
As shown in fig. 1, when the compressor of the air conditioner external unit operates at a low frequency, the power of the whole unit is low, and a PFC driving signal is turned off during actual control, so that the voltage drop of an inductor L and a diode D in a Boost circuit increases the loss of the controller; when the PFC driving signal is turned off, an input voltage limit value V is set according to the input voltage Vin and the input current Iin sampling signalTAnd input current limit ITWhen the input voltage is less than VTAnd the input current is less than ITWhen the relay K1 is attracted, the control method enables the relay K1 to select a model with lower voltage and lower current level, so that the volume of the device can be effectively reduced, and the material cost can be reduced; the loss generated by the conduction voltage drop of the relay is far less than the loss generated by the inductance L inductive reactance and the diode D voltage drop, and the low power consumption of the circuit is realized.
Fig. 4 is a preferred embodiment of a low power consumption power factor checking system, and the core control unit (MCU) is a digital signal processing chip, and may be other high speed processors. When the compressor of the air conditioner outdoor unit operates at medium-high frequency (higher than a certain frequency threshold value f)T) The control chip starts a driving signal to control the U1, so that the PFC function of the main circuit is realized; when the compressor of the air conditioner external unit operates at low frequency (lower than a certain frequency threshold value f)T) When the PFC driving signal is turned off, an input voltage limit value VT and an input current limit value IT can be set according to an input voltage Vin and an input current Iin sampling signal, when the input voltage is smaller than VT and the input current is smaller than IT, a relay K1 is attracted, and when the input voltage and the input current do not meet the requirement, the relay is disconnected, so that the relay K1 can select a model with a lower voltage and a lower current grade, the size of a device can be effectively reduced, and the material cost can be reduced; the loss generated by the conduction voltage drop of the relay is far less than the loss generated by the inductance L inductive reactance and the diode D voltage drop, and the low power consumption of the circuit is realized.
Figure 5 is a control flow diagram of the preferred embodiment,
1) when the running frequency of the compressor outside the air conditioner is greater than the threshold value fTWhen the relay is started, the PFC driving signal is started, and the relay K1 is disconnected;
2) when the running frequency of the compressor outside the air conditioner is less than or equal to the threshold value fTThen, the PFC driving signal is turned off, and whether the input current Iin is smaller than the limit value I or not is judgedTIs there a If not, the relay is disconnected; if yes, continuously detecting whether the input voltage is less than the limit value VTIs there a If yes, the relay K1 is closed, and if not, the relay K1 is opened.
3) And after the relay is disconnected or the relay is closed, the operation returns to the beginning, and whether the condition is met or not is continuously judged.
Example 2:
alternative embodiments for the control method of relay K1:
if the type selection current of the relay is large (the normal load input current can not exceed the rated value), when the input voltage is less than the limit value VTThe relay K1 is controlled to suck;
if the type selection voltage of the relay is larger (the normal input voltage does not exceed the rated value), when the input current is smaller than the limit value ITThe control relay K1 is pulled in.
The low-power-consumption power factor verification system K1 provided by the embodiment of the invention uses the optimal relay and can also be other switching devices with low conduction loss.
Example 3:
the diode D is short-circuited when the PFC drive signal is turned off, as shown in fig. 6.
Example 4:
the inductor L is shorted when the PFC drive signal is turned off, as shown in fig. 7.
Example 5:
when the PFC drive signal is turned off, current flows from diode D1, as shown in fig. 8.
Taking embodiment 1 as an example, generally, PFC inductor is about 500uH, line resistance is 60m Ω, diode conduction voltage is 1.2V, relay coil working loss is 0.5W, and assuming that current is 5A when a press operates at low frequency, then: the relay losses 0.5W, while the inductive losses and diode conduction losses 7W, reduce the losses by 6.5W.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims.

Claims (9)

1. A low-power-consumption power factor checking method is characterized by comprising the following steps:
when the compressor of the air conditioner external unit operates at a low frequency, the processor drives signals to be closed, an input voltage limit value and an input current limit value are determined according to an input minimum voltage and an input minimum current sampling signal, and when the input real-time voltage and current are smaller than the determined input voltage limit value and input current limit value, the relay is controlled to be attracted.
2. The low power consumption power factor verification method according to claim 1, wherein the low power consumption power factor verification method specifically comprises:
step one, judging whether the running frequency of an air conditioner external compressor is greater than a threshold value fT(ii) a If the running frequency of the air conditioner external compressor is greater than the threshold value fTTurning to the second step; if the running frequency of the air conditioner external compressor is less than or equal to the threshold value fTTurning to the third step;
step two, when the running frequency of the air conditioner external compressor is greater than a threshold value fTWhen the relay is started, the PFC driving signal is started, and the relay K1 is disconnected;
step three, when the running frequency of the air conditioner external compressor is less than or equal to a threshold value fT, the PFC driving signal is closed; and judging whether the input current Iin is smaller than the current limit value IT(ii) a And executing corresponding processing based on the judgment result;
and step four, returning to the step one, and executing the next-stage judgment.
3. The power factor checking method with low power consumption of claim 2, wherein in step three, the performing the corresponding processing based on the determination result comprises:
if the input current Iin is larger than or equal to the current limit value ITThe relay is disconnected;
if the input current Iin is less than the current limit value ITThen detecting whether the input voltage is less than the voltage limit value VT(ii) a If the input voltage is less than the voltage limit value VTThen the relay K1 is closed; if the input voltage is greater than or equal to the voltage limit value VTThen the relay K1 is opened.
4. The low power consumption power factor verification method of claims 1-3, wherein the relay is a low turn-on loss switching device.
5. A low power consumption power factor verification system implementing the low power consumption power factor verification method according to claims 1-4, characterized in that the low power consumption power factor verification system comprises a core control unit MCU;
the core control unit MCU includes:
for using digital signal processing chip or high-speed processor, when the compressor of the air conditioner external machine is operated at medium-high frequency, i.e. higher than a certain frequency threshold value fTStarting a driving signal control U1 to realize the PFC of the main circuit; at the same time, when the compressor of the air conditioner outer unit operates at low frequency, namely, is lower than a certain frequency threshold value fTAnd when the power of the whole machine is lower, the PFC driving signal is turned off, and the input voltage limit value V is set according to the input voltage Vin and the input current Iin sampling signalTAnd input current limit ITWhen the input voltage is less than VTAnd the input current is less than ITWhen the input voltage and the input current do not meet the requirements, the relay K1 is closed, and the relay is disconnected.
6. A processor, applied to an air conditioner, is characterized by performing the following steps:
step 1, judging whether the operating frequency of an external air conditioner compressor is greater than a threshold value fT(ii) a If the running frequency of the air conditioner external compressor is greater than the threshold value fTTurning to step 2; if the running frequency of the air conditioner external compressor is less than or equal to the threshold value fTTurning to step 3;
step 2, when the running frequency of the air conditioner external compressor is greater than a threshold value fTWhen the relay is started, the PFC driving signal is started, and the relay K1 is disconnected;
step 3, when the running frequency of the air conditioner external compressor is less than or equal to a threshold value fT, closing the PFC driving signal; and judging whether the input current Iin is smaller than the current limit value IT(ii) a And executing corresponding processing based on the judgment result;
and 4, returning to the step 1, and executing the next stage of judgment.
7. A compressor, characterized in that, when applied to an air conditioner, the compressor is provided with the processor of claim 6, when the compressor operates at a low frequency, the processor drives a signal to be closed, determines an input voltage limit value and an input current limit value according to an input minimum voltage and an input minimum current sampling signal, and controls the relay to be closed when the input real-time voltage and current are smaller than the determined input voltage limit value and input current limit value.
8. An air conditioner, characterized in that, the air conditioner is equipped with the compressor of claim 7, when the compressor operates at low frequency, the processor drive signal is closed, the input voltage limit value and the input current limit value are determined according to the input minimum voltage and the input minimum current sampling signal, and when the input real-time voltage and current are less than the determined input voltage limit value and input current limit value, the relay is controlled to be pulled in.
9. A computer-readable storage medium storing a computer program which, when executed by a processor, causes the processor to perform the steps of:
when the air conditioner compressor runs at a low frequency, the processor drives the signal to be closed, determines an input voltage limit value and an input current limit value according to an input minimum voltage and an input minimum current sampling signal, and controls the relay to be attracted when the input real-time voltage and current are smaller than the determined input voltage limit value and input current limit value.
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