CN111371307A - Control method of PFC circuit in variable frequency air conditioner and variable frequency air conditioner - Google Patents
Control method of PFC circuit in variable frequency air conditioner and variable frequency air conditioner Download PDFInfo
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- CN111371307A CN111371307A CN202010192496.2A CN202010192496A CN111371307A CN 111371307 A CN111371307 A CN 111371307A CN 202010192496 A CN202010192496 A CN 202010192496A CN 111371307 A CN111371307 A CN 111371307A
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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
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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
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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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- 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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- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
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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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
- F24F2110/12—Temperature of the outside air
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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
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/327—Means for protecting converters other than automatic disconnection against abnormal temperatures
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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
- 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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Abstract
The invention provides a control method of a PFC circuit in a variable frequency air conditioner and the variable frequency air conditioner. The control method of the PFC circuit in the variable frequency air conditioner comprises the following steps: acquiring input voltage of a PFC circuit, and determining a first voltage threshold of the PFC circuit according to the input voltage; acquiring the outdoor environment temperature of the variable frequency air conditioner, and determining a second voltage threshold of the PFC circuit according to the outdoor environment temperature; and determining a target voltage of the PFC circuit according to the first voltage threshold and the second voltage threshold, and starting the PFC circuit according to the target voltage. The scheme of the invention can effectively avoid the over-high temperature rise of the reactor of the PFC circuit in the variable frequency air conditioner, reduce the loss of the reactor without increasing the cost and prolong the service life of the reactor.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to a control method of a PFC (power factor correction) circuit in a variable frequency air conditioner and the variable frequency air conditioner.
Background
With the development of society and the increasing living standard of people, various air conditioning devices have become one of the indispensable electrical devices in people's daily life. Various air conditioning devices can help people to reach a temperature that can be adapted to when the ambient temperature is too high or too low. Current air conditioning devices mainly include various types of air conditioners and fans.
The current air conditioners can be divided into a fixed frequency air conditioner and a variable frequency air conditioner. The running frequency of the compressor of the fixed-frequency air conditioner is basically unchanged, and the ambient temperature is adjusted by continuously starting and stopping the compressor, so that the ambient temperature is suddenly cooled and suddenly heated, and more electric energy is consumed. The variable frequency air conditioner can change the power supply frequency of the compressor through the frequency converter, adjust the running frequency of the compressor to adjust the ambient temperature, and is small in temperature fluctuation and low in electric energy consumption. A PFC (Power factor correction) circuit is often used in the variable frequency air conditioner to increase the Power factor, and when the input voltage is too low and the current is high, the Power factor is too low, and at this time, the PFC function needs to be turned on. However, the prior art is mainly concerned with: judging the opening and closing of the PFC function; and (4) researching a control circuit algorithm in PFC. Although the technology can improve the power factor, the research on the temperature rise of the reactor is neglected, so that the temperature rise of the reactor is too high, and safety accidents are easy to happen when a circuit is close to a high-temperature reactor. Or to avoid safety risks, a higher specification reactor is chosen, but this increases the production costs considerably.
Disclosure of Invention
The invention aims to avoid the over-high temperature rise of a reactor of a PFC circuit in a variable frequency air conditioner.
A further purpose of the invention is to give consideration to the refrigeration effect and the use safety of the inverter air conditioner.
Particularly, the invention provides a control method of a PFC circuit in a variable frequency air conditioner, wherein the variable frequency air conditioner comprises an electric control board, the PFC circuit is arranged on the electric control board, and the control method of the PFC circuit in the variable frequency air conditioner comprises the following steps: acquiring input voltage of a PFC circuit, and determining a first voltage threshold of the PFC circuit according to the input voltage; acquiring the outdoor environment temperature of the variable frequency air conditioner, and determining a second voltage threshold of the PFC circuit according to the outdoor environment temperature; and determining a target voltage of the PFC circuit according to the first voltage threshold and the second voltage threshold, and starting the PFC circuit according to the target voltage.
Optionally, the step of determining the target voltage of the PFC circuit according to the first voltage threshold and the second voltage threshold includes: judging whether the first voltage threshold is larger than the second voltage threshold; and if so, determining that the second voltage threshold is the target voltage, and if not, determining that the first voltage threshold is the target voltage.
Optionally, the step of determining the second voltage threshold of the PFC circuit according to the outdoor ambient temperature includes: determining the conduction time of a switching device in the PFC circuit according to the outdoor environment temperature; and calculating to obtain a second voltage threshold according to the conduction time.
Optionally, the step of determining the on-time of the switching device in the PFC circuit according to the outdoor ambient temperature includes: matching a corresponding conduction time coefficient in a preset first information table according to the outdoor environment temperature; and calculating the product of the conduction time coefficient and the maximum conduction time to obtain the conduction time, wherein the maximum conduction time is the reciprocal of the fixed carrier frequency in the PFC circuit.
Optionally, when the outdoor environment temperature is lower than a first preset temperature, the conduction time coefficient is a first preset value; when the outdoor environment temperature is greater than or equal to the first preset temperature and less than the second preset temperature, the conduction time coefficient is a second preset value; when the outdoor environment temperature is greater than or equal to the second preset temperature and less than a third preset temperature, the conduction time coefficient is a third preset value; and when the outdoor environment temperature is higher than or equal to a third preset temperature, the conduction time coefficient is a fourth preset value, wherein the first preset value, the second preset value, the third preset value and the fourth preset value are sequentially reduced.
Optionally, the step of determining the first voltage threshold of the PFC circuit according to the input voltage comprises: and matching a corresponding first voltage threshold in a preset second information table according to the input voltage.
Optionally, when the input voltage is greater than or equal to the first preset voltage, the first voltage threshold is a fifth preset value; when the input voltage is greater than or equal to the second preset voltage and less than the first preset voltage, the first voltage threshold is a sixth preset value; when the input voltage is greater than or equal to a third preset voltage and less than a second preset voltage, the first voltage threshold is a seventh preset value; when the input voltage is smaller than the third preset voltage, the first voltage threshold is an eighth preset value, wherein the fifth preset value, the sixth preset value, the seventh preset value and the eighth preset value are sequentially reduced.
Optionally, the condition for turning on the PFC circuit includes: the input voltage is less than or equal to a preset voltage threshold; or the input current of the PFC circuit is larger than or equal to a preset current threshold value.
Optionally, the step of obtaining the input voltage of the PFC circuit includes: and measuring the initial voltage of a bus in the PFC circuit, and further calculating according to the initial voltage to obtain the input voltage.
According to another aspect of the present invention, there is also provided an inverter air conditioner, including a control device, the control device includes a processor and a memory, wherein the memory stores a control program, and the control program is used for implementing the control method of the PFC circuit in the inverter air conditioner when being executed by the processor.
The invention discloses a control method of a PFC circuit in a variable frequency air conditioner and the variable frequency air conditioner, wherein the variable frequency air conditioner comprises an electric control board, the PFC circuit is arranged on the electric control board, a first voltage threshold of the PFC circuit is determined by obtaining input voltage of the PFC circuit, a second voltage threshold of the PFC circuit is determined by obtaining outdoor environment temperature of the variable frequency air conditioner, then a target voltage of the PFC circuit is determined according to the first voltage threshold and the second voltage threshold, and the PFC circuit is started according to the target voltage. By analyzing the reason of overhigh temperature rise of the reactor in the PFC circuit, determining the target voltage according to the control logic and starting the PFC circuit according to the target voltage, the overhigh temperature rise of the reactor of the PFC circuit in the variable-frequency air conditioner can be effectively avoided, the cost is not increased, the loss of the reactor is reduced, and the service life of the reactor is prolonged.
Further, according to the control method of the PFC circuit in the variable frequency air conditioner and the variable frequency air conditioner, the conduction time of the switch device in the PFC circuit is determined according to the outdoor environment temperature, and the second voltage threshold is calculated according to the conduction time. And matching a corresponding first voltage threshold in a preset second information table according to the input voltage. And comparing the first voltage threshold with the second voltage threshold, and taking the smaller of the first voltage threshold and the second voltage threshold as a target voltage. The power factor of the variable frequency air conditioner is improved, meanwhile, the over-high temperature of the reactor under special working conditions is avoided, and the refrigeration effect and the use safety of the variable frequency air conditioner are both considered.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
fig. 1 is a schematic diagram of a PFC circuit in a method of controlling the PFC circuit in the inverter air conditioner according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a control method of a PFC circuit in an inverter air conditioner according to an embodiment of the present invention;
fig. 3 is a detailed flowchart of a control method of a PFC circuit in the inverter air conditioner according to an embodiment of the present invention; and
fig. 4 is a schematic block diagram of an inverter air conditioner according to an embodiment of the present invention.
Detailed Description
Fig. 1 is a schematic diagram of a PFC circuit 300 in a method for controlling the PFC circuit in the inverter air conditioner according to an embodiment of the present invention. The inverter air conditioner 100 includes an electric control board, and the PFC circuit 300 is disposed on the electric control board. As shown in fig. 1, the PFC circuit 300 mainly includes: reactor L, boost diode D1, switching tube Q, and control circuit 310. The switch tube Q may be an MOS (Metal Oxide Semiconductor field effect Transistor) or an IGBT (Insulated gate bipolar Transistor), and the control circuit 310 is configured to control the MOS or IGBT switch. Fig. 1 also shows components such as a rectifier 400, an inverter circuit 500, a current detection resistor R, a high-frequency bypass filter capacitor C1, and a large-capacity filter capacitor C. Fig. 1 shows a three-stage design of an inverter with PFC function. The first stage is used for realizing an electrical isolation function and ensuring the safety of power supply equipment; the second stage is a power factor correction circuit which is used for forcing the line current to follow the line voltage, so that the line current is sinusoidal, the power factor is improved, and the harmonic content is reduced; the third stage is used for realizing an inversion function, and the frequency and the amplitude of the output voltage or current of the inverter are flexibly changed by controlling the working frequency and the output time proportion of the inverter circuit.
The PFC circuit 300 may boost the power factor of the inverter air conditioner 100 and may be turned on under certain conditions. Specifically, the conditions for turning on the PFC circuit 300 include: the input voltage is less than or equal to a preset voltage threshold; or the input current of the PFC circuit 300 is greater than or equal to a preset current threshold. Because the heating condition of the IGBT or the MOS is focused in the prior art, the control is usually performed based on the reduction of the heating of the IGBT, but in the actual operation, because the switching devices such as the IGBT and the like are provided with radiators and are positioned at a ventilation position, the heating of the IGBT is not serious, the reactor L is prevented from being soaked by water in the actual installation and needs to be positioned at a leeward position, and only based on the temperature rise control method of the IGBT, the phenomenon that when the input voltage is too low, the switching frequency of the IGBT is very high so as to meet the requirement of bus voltage, and the temperature rise of the reactor L is too high is often caused.
The embodiment firstly provides a control method of a PFC circuit in a variable frequency air conditioner, and by analyzing the reason that the temperature rise of a reactor L in the PFC circuit 300 is too high, a target voltage is determined according to a certain control logic, and the PFC circuit 300 is started according to the target voltage, so that the temperature rise of the reactor L in the PFC circuit 300 in the variable frequency air conditioner 100 can be effectively avoided being too high, the loss of the reactor L is reduced while the cost is not increased, and the service life of the reactor L is prolonged. It should be noted that the control method of the PFC circuit in the inverter air conditioner of this embodiment is not controlled according to the method of this embodiment when the inverter air conditioner 100 is applied to a cooling condition, that is, when the inverter air conditioner operates in a heating mode. Fig. 2 is a schematic diagram of a control method of a PFC circuit in an inverter air conditioner according to an embodiment of the present invention. As shown in fig. 2, the method for controlling the PFC circuit in the inverter air conditioner may perform the following steps:
step S202, acquiring an input voltage of the PFC circuit 300, and determining a first voltage threshold of the PFC circuit 300 according to the input voltage;
step S204, acquiring the outdoor environment temperature of the inverter air conditioner 100, and determining a second voltage threshold of the PFC circuit 300 according to the outdoor environment temperature;
in step S206, a target voltage of the PFC circuit 300 is determined according to the first voltage threshold and the second voltage threshold, and the PFC circuit 300 is turned on according to the target voltage.
Through analysis of the reason why the temperature of the reactor L in the PFC circuit 300 is too high, the following reasons are found: the outdoor environment temperature is high, the current of the reactor L is high, the switching frequency of the MOS or IGBT switching device in the control circuit 310 is high, the on-time is high, once the PFC circuit 300 is turned on, the PFC circuit operates at the highest switching frequency or on-time when the input voltage is low, and thus the loss of the reactor L is large.
In this embodiment, the target voltage is determined first, and then the PFC circuit 300 is turned on, so that the temperature rise of the reactor L of the PFC circuit 300 in the inverter air conditioner 100 due to the above reasons can be effectively avoided. The specific step of acquiring the input voltage of the PFC circuit 300 in step S202 may include: the initial voltage of the bus in the PFC circuit 300 is measured, and then the input voltage is calculated according to the initial voltage. In one specific embodiment, the input voltage is equal to the initial voltage divided by 1.414.
The step of determining the first voltage threshold of the PFC circuit 300 according to the input voltage in step S202 may include: and matching a corresponding first voltage threshold in a preset second information table according to the input voltage. The second information table stores a corresponding relationship between the input voltage and the first voltage threshold in advance. For example, when the input voltage is greater than or equal to the first preset voltage, the first voltage threshold is a fifth preset value; when the input voltage is greater than or equal to the second preset voltage and less than the first preset voltage, the first voltage threshold is a sixth preset value; when the input voltage is greater than or equal to a third preset voltage and less than a second preset voltage, the first voltage threshold is a seventh preset value; when the input voltage is smaller than the third preset voltage, the first voltage threshold is an eighth preset value, wherein the fifth preset value, the sixth preset value, the seventh preset value and the eighth preset value are sequentially reduced.
One embodiment is described below:
when the input voltage is greater than or equal to the first preset voltage 220V, the first voltage threshold is a fifth preset value 360V; when the input voltage is greater than or equal to the second preset voltage 198V and less than the first preset voltage 220V, the first voltage threshold is a sixth preset value 350V; when the input voltage is greater than or equal to the third preset voltage 176V and less than the second preset voltage 198V, the first voltage threshold is a seventh preset value 330V; when the input voltage is less than the third preset voltage 176V, the first voltage threshold is an eighth preset value 300V. The specific numerical values are merely examples, and are not intended to limit the present invention, and may be set in advance according to actual circumstances.
The specific step of determining the second voltage threshold of the PFC circuit 300 according to the outdoor ambient temperature in step S204 may include: determining the on-time of the switching device in the PFC circuit 300 according to the outdoor environment temperature; and calculating to obtain a second voltage threshold according to the conduction time. Further, the step of determining the on-time of the switching device in the PFC circuit 300 according to the outdoor ambient temperature may include: matching a corresponding conduction time coefficient in a preset first information table according to the outdoor environment temperature; the product of the on-time coefficient and the maximum on-time is calculated to obtain the on-time, where the maximum on-time is the reciprocal of the fixed carrier frequency in the PFC circuit 300. In one specific embodiment, the fixed carrier frequency is 16KHz, the inverse of which is the maximum on-time.
The first information table stores a corresponding relation between the outdoor environment temperature and the conduction time coefficient in advance. For example, when the outdoor environment temperature is lower than a first preset temperature, the conduction time coefficient is a first preset value; when the outdoor environment temperature is greater than or equal to the first preset temperature and less than the second preset temperature, the conduction time coefficient is a second preset value; when the outdoor environment temperature is greater than or equal to the second preset temperature and less than a third preset temperature, the conduction time coefficient is a third preset value; and when the outdoor environment temperature is higher than or equal to a third preset temperature, the conduction time coefficient is a fourth preset value, wherein the first preset value, the second preset value, the third preset value and the fourth preset value are sequentially reduced.
One embodiment is described below:
when the outdoor environment temperature is lower than the first preset temperature by 35 ℃, the conduction time coefficient is 95% of the first preset value; when the outdoor environment temperature is more than or equal to 35 ℃ of the first preset temperature and less than 45 ℃ of the second preset temperature, the conduction time coefficient is 90% of the second preset value; when the outdoor environment temperature is greater than or equal to 45 ℃ of the second preset temperature and less than 50 ℃ of the third preset temperature, the conduction time coefficient is 87% of the third preset value; and when the outdoor environment temperature is greater than or equal to the third preset temperature by 50 ℃, the conduction time coefficient is 85% of the fourth preset value. The specific numerical values are merely examples, and are not intended to limit the present invention, and may be set in advance according to actual circumstances.
The step of determining the target voltage of the PFC circuit 300 according to the first voltage threshold and the second voltage threshold in step S206 may include: judging whether the first voltage threshold is larger than the second voltage threshold; and if so, determining that the second voltage threshold is the target voltage, and if not, determining that the first voltage threshold is the target voltage. That is, the smaller of the first voltage threshold and the second voltage threshold is selected as the target voltage. The PFC circuit 300 is started according to the target voltage, so that the phenomenon that the temperature of the reactor L of the PFC circuit 300 in the variable-frequency air conditioner 100 is too high can be effectively avoided, the loss of the reactor L is reduced while the cost is not increased, and the service life of the reactor L is prolonged. The conditions for turning on the PFC circuit 300 in step S206 may include: the input voltage is less than or equal to a preset voltage threshold; or the input current of the PFC circuit 300 is greater than or equal to a preset current threshold.
In some optional embodiments, the inverter air conditioner 100 may achieve a higher technical effect by further optimizing and configuring the above steps, and the following describes in detail the control method of the PFC circuit in the inverter air conditioner of this embodiment in combination with a description of an optional execution flow of this embodiment, where this embodiment is merely an illustration of the execution flow, and in a specific implementation, an execution sequence and an operation condition of a part of steps may be modified according to specific implementation requirements. Fig. 3 is a detailed flowchart of a control method of a PFC circuit in an inverter air conditioner according to an embodiment of the present invention, and the control method of the PFC circuit in the inverter air conditioner includes the following steps:
step S302, measuring the initial voltage of a bus in the PFC circuit 300, and further calculating according to the initial voltage to obtain an input voltage;
step S304, matching a corresponding first voltage threshold value in a preset second information table according to the input voltage;
step S306, acquiring the outdoor environment temperature of the inverter air conditioner 100;
step S308, matching a corresponding conduction time coefficient in a preset first information table according to the outdoor environment temperature;
step S310, calculating the product of the conduction time coefficient and the maximum conduction time to obtain the conduction time;
step S312, calculating according to the conduction time to obtain a second voltage threshold;
step S314, determining whether the first voltage threshold is greater than the second voltage threshold, if so, performing step S316, otherwise, performing step S318;
step S316, determining the second voltage threshold as the target voltage, and executing step S320;
step S318, determining the first voltage threshold as the target voltage, and executing step S320;
in step S320, the PFC circuit 300 is turned on according to the target voltage.
In the above step, the second voltage threshold is calculated according to the on-time in step S312, and specifically, the second voltage threshold may be calculated by using a PID algorithm. According to the control method of the PFC circuit in the inverter air conditioner, by analyzing the reason that the temperature rise of the reactor L in the PFC circuit 300 is too high, the target voltage is determined according to the control logic, and the PFC circuit 300 is started according to the target voltage, so that the temperature rise of the reactor L in the PFC circuit 300 in the inverter air conditioner 100 can be effectively avoided being too high, the loss of the reactor L is reduced while the cost is not increased, and the service life of the reactor L is prolonged.
Further, in the method for controlling the PFC circuit in the inverter air conditioner according to this embodiment, the on-time of the switching device in the PFC circuit 300 is determined according to the outdoor environment temperature, and the second voltage threshold is calculated according to the on-time. And matching a corresponding first voltage threshold in a preset second information table according to the input voltage. And comparing the first voltage threshold with the second voltage threshold, and taking the smaller of the first voltage threshold and the second voltage threshold as a target voltage. The power factor of the inverter air conditioner 100 is improved, meanwhile, the over-high temperature of the reactor L under special working conditions is avoided, and the refrigeration effect and the use safety of the inverter air conditioner 100 are both considered.
The embodiment further provides a variable frequency air conditioner 100, which can effectively avoid the over-high temperature rise of the reactor L of the PFC circuit 300 in the variable frequency air conditioner 100, reduce the loss of the reactor L without increasing the cost, and prolong the service life of the reactor L. Fig. 4 is a schematic block diagram of an inverter air conditioner 100 according to an embodiment of the present invention. As shown in fig. 4, the inverter air conditioner 100 includes a control device 200, the control device 200 includes a processor 210 and a memory 220, wherein the memory 220 stores a control program 221, and the control program 221 is used for implementing the control method of the PFC circuit in the inverter air conditioner according to any of the above embodiments when executed by the processor 210.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (10)
1. A control method of a PFC circuit in a variable frequency air conditioner comprises an electric control board, wherein the PFC circuit is arranged on the electric control board, and the control method of the PFC circuit in the variable frequency air conditioner comprises the following steps:
acquiring input voltage of the PFC circuit, and determining a first voltage threshold of the PFC circuit according to the input voltage;
acquiring the outdoor environment temperature of the variable frequency air conditioner, and determining a second voltage threshold of the PFC circuit according to the outdoor environment temperature; and
and determining a target voltage of the PFC circuit according to the first voltage threshold and the second voltage threshold, and starting the PFC circuit according to the target voltage.
2. The method for controlling the PFC circuit of the inverter air conditioner of claim 1, wherein the step of determining the target voltage of the PFC circuit based on the first voltage threshold and the second voltage threshold comprises:
judging whether the first voltage threshold value is larger than the second voltage threshold value; and
if so, determining the second voltage threshold as the target voltage,
if not, determining that the first voltage threshold is the target voltage.
3. The method for controlling the PFC circuit of the inverter air conditioner of claim 1, wherein the step of determining the second voltage threshold of the PFC circuit according to the outdoor ambient temperature comprises:
determining the conduction time of a switching device in the PFC circuit according to the outdoor environment temperature; and
and calculating the second voltage threshold according to the conduction time.
4. The method for controlling the PFC circuit of the inverter air conditioner as claimed in claim 3, wherein the step of determining the on-time of the switching device of the PFC circuit according to the outdoor ambient temperature comprises:
matching a corresponding conduction time coefficient in a preset first information table according to the outdoor environment temperature; and
and calculating the product of the conduction time coefficient and the maximum conduction time to obtain the conduction time, wherein the maximum conduction time is the reciprocal of the fixed carrier frequency in the PFC circuit.
5. The method for controlling the PFC circuit in the inverter air conditioner of claim 4, wherein,
when the outdoor environment temperature is lower than a first preset temperature, the conduction time coefficient is a first preset value;
when the outdoor environment temperature is greater than or equal to the first preset temperature and less than a second preset temperature, the conduction time coefficient is a second preset value;
when the outdoor environment temperature is greater than or equal to the second preset temperature and less than a third preset temperature, the conduction time coefficient is a third preset value;
when the outdoor environment temperature is greater than or equal to the third preset temperature, the conduction time coefficient is a fourth preset value, wherein the first preset value, the second preset value, the third preset value and the fourth preset value are sequentially reduced.
6. The method for controlling the PFC circuit of the inverter air conditioner of claim 1, wherein the step of determining the first voltage threshold of the PFC circuit based on the input voltage comprises:
and matching the corresponding first voltage threshold value in a preset second information table according to the input voltage.
7. The control method of the PFC circuit in the inverter air conditioner of claim 6, wherein,
when the input voltage is greater than or equal to a first preset voltage, the first voltage threshold is a fifth preset value;
when the input voltage is greater than or equal to a second preset voltage and smaller than the first preset voltage, the first voltage threshold is a sixth preset value;
when the input voltage is greater than or equal to a third preset voltage and less than the second preset voltage, the first voltage threshold is a seventh preset value;
when the input voltage is smaller than the third preset voltage, the first voltage threshold is an eighth preset value, wherein the fifth preset value, the sixth preset value, the seventh preset value and the eighth preset value are sequentially decreased.
8. The method for controlling the PFC circuit of the inverter air conditioner of claim 1, wherein,
the conditions for turning on the PFC circuit include: the input voltage is less than or equal to a preset voltage threshold; or
The input current of the PFC circuit is larger than or equal to a preset current threshold value.
9. The method for controlling the PFC circuit of the inverter air conditioner of claim 1, wherein the step of obtaining the input voltage of the PFC circuit comprises:
and measuring the initial voltage of a bus in the PFC circuit, and calculating the input voltage according to the initial voltage.
10. An inverter air conditioner comprising a control device including a processor and a memory, wherein the memory stores a control program, and the control program is executed by the processor to implement the control method of the PFC circuit in the inverter air conditioner according to any one of claims 1 to 9.
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