CN112303707A - Air conditioner and voltage control method - Google Patents

Air conditioner and voltage control method Download PDF

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Publication number
CN112303707A
CN112303707A CN202011101083.5A CN202011101083A CN112303707A CN 112303707 A CN112303707 A CN 112303707A CN 202011101083 A CN202011101083 A CN 202011101083A CN 112303707 A CN112303707 A CN 112303707A
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China
Prior art keywords
voltage value
preset
driving chip
outdoor unit
switch tube
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Granted
Application number
CN202011101083.5A
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Chinese (zh)
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CN112303707B (en
Inventor
李文阳
李希志
华如文
王秋晨
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Qingdao Hisense Hitachi Air Conditioning System Co Ltd
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Priority to CN202011101083.5A priority Critical patent/CN112303707B/en
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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
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/0003—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station characterised by a split arrangement, wherein parts of the air-conditioning system, e.g. evaporator and condenser, are in separately located units
    • 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
    • F24F11/32—Responding to malfunctions or emergencies
    • 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
    • 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
    • F24F11/88—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
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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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)
  • Human Computer Interaction (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an air conditioner and a voltage control method, wherein a controller of the air conditioner is configured to: if the voltage value of the direct current bus is detected to be larger than a first preset voltage value and not larger than a second preset voltage value, enabling the brake protection circuit to act; and if the power switch tube is in a conducting state and the voltage value is detected to be reduced to be not more than the first preset voltage value, stopping the action of the brake protection circuit, so that the voltage of the direct current bus is accurately controlled when the direct current bus is not connected with the electrolytic capacitor.

Description

Air conditioner and voltage control method
Technical Field
The present disclosure relates to the field of air conditioner control, and more particularly, to an air conditioner and a voltage control method.
Background
In the frequency conversion air conditioner, the electrolytic capacitor on the direct current bus is used for carrying out smooth filtering on the bus voltage, so that the bus voltage is ensured to be in a stable state within a certain range, but the service life is shortened due to the fact that electrolyte in the electrolytic capacitor can be slowly leaked, and the service life of an air conditioner product is influenced.
If the scheme without the electrolytic capacitor is adopted, the advantages can be brought in the aspects of service life, temperature rise, volume, cost and the like, but the absorption balance effect of the electrolytic capacitor on bus fluctuation can not be realized correspondingly, so that if the bus voltage is disturbed or abnormally controlled, sudden rise can occur, related electric parts can be damaged, and air conditioner faults can be caused.
Therefore, how to provide an air conditioner capable of accurately controlling the voltage of the direct current bus when the direct current bus is not connected with the electrolytic capacitor, so as to improve the reliability of the air conditioner is a technical problem to be solved at present.
Disclosure of Invention
The present invention provides an air conditioner, comprising:
an outdoor unit;
an indoor unit provided with an indoor fan;
further comprising:
the power supply module comprises a direct current bus, wherein the direct current bus is not connected with an electrolytic capacitor for smoothing bus voltage, the power supply module also comprises a brake protection circuit, the brake protection circuit comprises a driving chip, a power switch tube and a power resistor, the driving chip is connected with the power switch tube, and the power switch tube and the power resistor are connected between the anode and the cathode of the direct current bus in series;
a controller connected to the driving chip and configured to:
if the voltage value of the direct current bus is detected to be larger than a first preset voltage value and not larger than a second preset voltage value, sending a starting instruction to the driving chip to enable the driving chip to control the power switch tube to be conducted;
if the power switch tube is in a conducting state and the voltage value is detected to be reduced to be not more than the first preset voltage value, sending a closing instruction to the driving chip so that the driving chip controls the power switch tube to be cut off;
the first preset voltage value is the highest value of the bus voltage within a preset fluctuation range.
In some embodiments of the present application, the controller is further configured to:
and if the voltage value is detected to be larger than the second preset voltage value and not larger than a third preset voltage value, controlling the outdoor unit to stop and keeping the indoor fan to operate until the first preset time is reached, and restarting the outdoor unit.
In some embodiments of the present application, the controller is further configured to:
if the voltage value is detected to be greater than the second preset voltage value and not greater than the third preset voltage value after the outdoor unit is restarted, controlling the outdoor unit to be stopped, keeping the indoor fan to operate until the first preset time is reached, restarting the outdoor unit, and adding one to the retry times;
and if the retry times reach the preset times within a second preset time, stopping the indoor unit and the outdoor unit, and sending stop alarm information.
In some embodiments of the present application, a protection element is further connected in series to the dc bus, and the controller is further configured to:
and if the voltage value is detected to be larger than the third preset voltage value and the protection element is triggered to be disconnected, sending shutdown alarm information.
In some embodiments of the present application, the controller is further configured to:
after a closing instruction is sent to the driving chip, if the voltage value is larger than the first preset voltage value and not larger than the second preset voltage value, the opening instruction is sent to the driving chip, so that the driving chip controls the power switch tube to be conducted.
Correspondingly, the invention also provides a voltage control method, which is applied to an air conditioner comprising an outdoor unit and an indoor unit, and the air conditioner further comprises the following steps:
the power supply module comprises a direct current bus, wherein the direct current bus is not connected with an electrolytic capacitor for smoothing bus voltage, the power supply module also comprises a brake protection circuit, the brake protection circuit comprises a driving chip, a power switch tube and a power resistor, the driving chip is connected with the power switch tube, and the power switch tube and the power resistor are connected between the anode and the cathode of the direct current bus in series;
the controller is connected with the driving chip;
the method comprises the following steps:
if the voltage value of the direct current bus is detected to be larger than a first preset voltage value and not larger than a second preset voltage value, sending a starting instruction to the driving chip to enable the driving chip to control the power switch tube to be conducted;
if the power switch tube is in a conducting state and the voltage value is detected to be reduced to be not more than the first preset voltage value, sending a closing instruction to the driving chip so that the driving chip controls the power switch tube to be cut off;
the first preset voltage value is the highest value of the bus voltage within a preset fluctuation range.
In some embodiments of the present application, the method further comprises:
and if the voltage value is detected to be larger than the second preset voltage value and not larger than a third preset voltage value, controlling the outdoor unit to stop and keeping an indoor fan in the indoor unit to operate until the first preset time is reached, and restarting the outdoor unit.
In some embodiments of the present application, the method further comprises:
if the voltage value is detected to be greater than the second preset voltage value and not greater than the third preset voltage value after the outdoor unit is restarted, controlling the outdoor unit to be stopped, keeping the indoor fan to operate until the first preset time is reached, restarting the outdoor unit, and adding one to the retry times;
and if the retry times reach the preset times within a second preset time, stopping the indoor unit and the outdoor unit, and sending stop alarm information.
In some embodiments of the present application, a protection element is further connected in series to the dc bus, and the method further includes:
and if the voltage value is detected to be larger than the third preset voltage value and the protection element is triggered to be disconnected, sending shutdown alarm information.
In some embodiments of the present application, after issuing a shutdown instruction to the driver chip, the method further includes:
and if the voltage value is greater than the first preset voltage value and not greater than the second preset voltage value, sending the starting instruction to the driving chip so that the driving chip controls the power switch tube to be conducted.
By applying the technical scheme, if the voltage value of the direct current bus is detected to be greater than a first preset voltage value and not greater than a second preset voltage value, the brake protection circuit is enabled to act; if the power switch tube is in a conducting state and the voltage value is detected to be reduced to be not more than the first preset voltage value, stopping the action of a brake protection circuit, wherein the first preset voltage value is the highest value of the bus voltage in a preset fluctuation range, so that the direct-current bus voltage is accurately controlled when the direct-current bus is not connected with the electrolytic capacitor, and the alarm and the shutdown are not triggered, so that the reliability of the air conditioner is improved;
if the voltage value is detected to be larger than the second preset voltage value and not larger than a third preset voltage value, controlling the outdoor unit to stop and keeping the indoor fan to operate, restarting the outdoor unit until the first preset time is reached, and adopting software protection measures to accurately control the voltage of the direct-current bus on the premise of not influencing the use of a user, so that the user experience is improved;
if the voltage value is detected to be larger than the third preset voltage value, the protection element is triggered to be disconnected, shutdown alarm information is sent, and safety of the direct-current bus is guaranteed based on hardware protection measures.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an air conditioner according to an embodiment of the present invention;
FIG. 2 shows a schematic structural diagram of a power supply module in an embodiment of the invention;
FIG. 3 is a schematic diagram illustrating an effect of a voltage control method according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating an effect of a voltage control method according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
An embodiment of the present application provides an air conditioner, as shown in fig. 1, including:
an outdoor unit 101, in which a compressor is provided in the outdoor unit 101;
an indoor unit 102, the indoor unit 102 being provided with an indoor fan;
further comprising:
a power supply module 103, as shown in fig. 2, including a dc bus, where the dc bus is not connected to an electrolytic capacitor for smoothing bus voltage, and the power supply module 103 further includes a brake protection circuit, where the brake protection circuit includes a driving chip (i.e., a driving IC), a power switching tube and a power resistor, the driving chip is connected to the power switching tube, and the power switching tube and the power resistor are connected in series between a positive electrode and a negative electrode of the dc bus;
a controller 104 (i.e., MCU), connected to the driving chip, configured to:
if the voltage value of the direct current bus is detected to be larger than a first preset voltage value and not larger than a second preset voltage value, sending a starting instruction to the driving chip to enable the driving chip to control the power switch tube to be conducted;
if the power switch tube is in a conducting state and the voltage value is detected to be reduced to be not more than the first preset voltage value, sending a closing instruction to the driving chip so that the driving chip controls the power switch tube to be cut off;
the first preset voltage value is the highest value of the bus voltage within a preset fluctuation range.
The national grid regulated supply voltage can fluctuate by 10%, so to ensure that the air conditioner normally operates in the range, an accurate range is determined in advance through the operation of full working condition and full load, and in the period, factors such as reliability, measurement error, reaction time lag, transmission time and the like need to be considered. After the normal working range is determined, the highest value of the bus voltage is set as a first preset voltage value under the normal condition.
The controller detects the voltage value of the direct current bus in real time, and optionally detects the voltage value based on a special voltage division detection circuit or detects the voltage value based on a voltage transformer.
If the voltage value of the direct current bus is detected to be larger than the first preset voltage value and not larger than the second preset voltage value, the amplitude and the energy of the bus voltage are not large although the bus voltage is increased, so that the bus voltage can be processed by a brake protection circuit, and a starting instruction is sent to the driving chip, so that the driving chip controls the power switch tube to be conducted. Specifically, as shown in fig. 2, the driving chip operates to control the conduction of the power switch tube, and since the power resistor and the power switch tube are directly connected in series between the positive electrode and the negative electrode of the dc bus, the power switch tube has almost no resistance value after being conducted, which is equivalent to conducting the positive electrode and the negative electrode of the bus instantaneously through the power resistor, so that the energy boosted by the voltage of the dc bus is quickly released in the form of heat energy of the power resistor to reduce the voltage of the dc bus, and optionally, the continuous operating time of the power resistor is longer than a preset threshold.
If the power switch tube is in a conducting state and the voltage value is detected to be reduced to be not more than the first preset voltage value, the voltage value of the direct current bus is restored to be normal under the action of the brake protection circuit, the controller sends a closing instruction to the driving chip, so that the driving chip controls the power switch tube to be cut off, the brake protection circuit is closed, the power resistor is powered off, and the direct current bus is restored to be in a normal state.
The normal operation of the air conditioner is not influenced during the working period of the brake protection circuit, and the conditions of shutdown, alarm and the like cannot occur.
To further ensure the reliability of the dc bus, in some embodiments of the present application, the controller is further configured to:
after a closing instruction is sent to the driving chip, if the voltage value is larger than the first preset voltage value and not larger than the second preset voltage value, the opening instruction is sent to the driving chip, so that the driving chip controls the power switch tube to be conducted.
In this embodiment, after sending a close instruction to the driving chip to stop the operation of the brake protection circuit, if the voltage value of the dc bus rises to be greater than the first preset voltage value and not greater than the second preset voltage value, the brake protection circuit may be turned on again, and the open instruction is sent to the driving chip to make the driving chip control the conduction of the power switch tube, so that the brake protection circuit may operate for multiple times, and the dc bus voltage may be recovered to be normal without affecting the normal operation of the air conditioner.
To further improve the reliability of the dc bus, in some embodiments of the present application, the controller is further configured to:
and if the voltage value is detected to be larger than the second preset voltage value and not larger than a third preset voltage value, controlling the outdoor unit to stop and keeping the indoor fan to operate until the first preset time is reached, and restarting the outdoor unit.
In this embodiment, if it is detected that the voltage value is greater than the second predetermined voltage value and not greater than a third predetermined voltage value, the direct current bus voltage is higher, the rising time is faster, the energy is larger, the direct current bus voltage cannot be processed through the brake protection circuit, the outdoor unit is controlled to stop and the indoor fan is kept running until the first preset time is reached, the outdoor unit is restarted, specifically, the outdoor unit comprises a compressor, the stopping of the outdoor unit is controlled to be equivalent to the disconnection of a part of loads on the direct current bus, such as a variable frequency power supply of the compressor, so that the direct current bus voltage can be reduced, in order to keep the indoor fan running continuously and restart the outdoor unit after the first preset time is reached without influencing the use of users, so that the air conditioner is recovered to normal operation, by only stopping the outdoor unit temporarily, the bus voltage is reduced without affecting the user experience.
To further improve the reliability of the dc bus, in some embodiments of the present application, the controller is further configured to:
if the voltage value is detected to be greater than the second preset voltage value and not greater than the third preset voltage value after the outdoor unit is restarted, controlling the outdoor unit to be stopped, keeping the indoor fan to operate until the first preset time is reached, restarting the outdoor unit, and adding one to the retry times;
and if the retry times reach the preset times within a second preset time, stopping the indoor unit and the outdoor unit, and sending stop alarm information.
Specifically, if the voltage value is greater than the second preset voltage value and not greater than the third preset voltage value, after the outdoor unit is controlled to stop for a first preset time and restart the outdoor unit, the voltage value of the direct current bus is increased to be greater than the second preset voltage value and not greater than the third preset voltage value again, the outdoor unit can be controlled to stop again and the indoor fan is kept running, the outdoor unit is restarted until the first preset time is reached, the retry number is added by one, if the retry number reaches the preset number in the second preset time, such as three times, it is indicated that an abnormal condition caused by other reasons needs to be alarmed to prompt a professional to maintain, so as to protect the safety of the air conditioning equipment, stop the indoor unit and the outdoor unit, and send out stop alarm information, and a technician in the field can flexibly set different preset numbers according to actual conditions, this does not affect the scope of protection of the present application.
In order to ensure the safety of the dc bus, in some embodiments of the present application, a protection element is further connected in series to the dc bus, and the controller is further configured to:
and if the voltage value is detected to be larger than the third preset voltage value and the protection element is triggered to be disconnected, sending shutdown alarm information.
In this embodiment, if it is detected that the voltage value is greater than the third preset voltage value, the bus voltage is very high and the rise time is very fast, the energy is huge, it may not be time to perform shutdown protection, in order to protect other functional components, a protection element is connected in series to the dc bus, and the protection element is a component that can be quickly replaced, for example: the fuse, the voltage-sensitive and the like trigger the protection element to be disconnected when the voltage value is greater than the third preset voltage value, disconnect the direct current bus to protect other devices, and generate shutdown alarm information to prompt maintenance personnel to handle.
By applying the above technical solution, the controller of the air conditioner is configured to: if the voltage value of the direct current bus is detected to be larger than a first preset voltage value and not larger than a second preset voltage value, enabling the brake protection circuit to act; if the power switch tube is in a conducting state and the voltage value is detected to be reduced to be not more than the first preset voltage value, stopping the action of a brake protection circuit, wherein the first preset voltage value is the highest value of the bus voltage within a preset fluctuation range, so that the direct-current bus voltage is accurately controlled when the direct-current bus is not connected with the electrolytic capacitor;
if the voltage value is detected to be larger than the second preset voltage value and not larger than a third preset voltage value, controlling the outdoor unit to stop and keeping the indoor fan to operate until the first preset time is reached, restarting the outdoor unit, and adopting software protection measures to accurately control the voltage of the direct-current bus on the premise of not influencing the use of a user;
if the voltage value is detected to be larger than the third preset voltage value, the protection element is triggered to be disconnected, shutdown alarm information is sent, and safety of the direct-current bus is guaranteed based on hardware protection measures.
In order to further illustrate the technical idea of the present invention, the technical solution of the present invention will now be described with reference to specific application scenarios.
The air-conditioning product is equivalent to the loss of protection due to the fact that an electrolytic capacitor is removed. When the air conditioner is started, after a compressor starts to operate, the direct current bus voltage will be in a regular oscillation state, and as the frequency increasing load of the compressor increases, the direct current bus voltage oscillation will also increase, and the oscillation is within the control range without an electrolytic frequency conversion scheme and is normal, but if abnormal conditions such as power failure, abnormal chip reset, rapid frequency reduction or compressor desynchronization occur in the period, rapid rise of the direct current bus voltage will occur, resulting in overvoltage damage of devices in the period, so to prevent abnormal sudden change of the direct current bus voltage, protect associated electrical components, and in order to solve the problem, the embodiment of the invention provides a voltage control method, which is applied to an air conditioner comprising an outdoor unit and an indoor unit, and the air conditioner further comprises:
the power supply module comprises a direct current bus, wherein the direct current bus is not connected with an electrolytic capacitor for smoothing bus voltage, the power supply module also comprises a brake protection circuit, the brake protection circuit comprises a driving chip, a power switch tube and a power resistor, the driving chip is connected with the power switch tube, and the power switch tube and the power resistor are connected between the anode and the cathode of the direct current bus in series;
the controller is connected with the driving chip;
as shown in fig. 3, the method includes:
step one, monitoring the voltage value of the direct current bus in real time when the air conditioner operates normally.
If the voltage value is abnormal, judging the abnormal level, dividing the voltage value into three levels according to the magnitude of the voltage value, namely a level 1 condition, a level 2 condition and a level 3 condition, setting the highest bus voltage to be M under the normal condition, setting the bus voltage to exceed the normal value under the level 1 condition, and setting the bus voltage to be X (X is larger than M); the bus voltage exceeds the normal value under the condition of 2 levels, and is set as Y (Y is more than X); in the case of level 3, the bus voltage exceeds the normal value and is set to be Z (Z > Y).
And step three, if the voltage value is X, performing level 1 treatment including brake opening to enable a brake protection circuit to act, as shown in fig. 2, enabling a driving chip to work to control the conduction of a power switch tube, wherein the power resistor and the power switch tube are directly connected in series between the anode and the cathode of the direct current bus, and the power switch tube has almost no resistance value after being conducted, which is equivalent to instantly conducting the anode and the cathode of the bus through the power resistor, so that the energy boosted by the voltage of the direct current bus is quickly released in the form of heat energy of the power resistor to reduce the voltage of the direct current bus. The brake protection circuit can act for many times, and if the voltage value of the direct current bus is recovered to be normal, the brake is closed, and the brake protection circuit is closed.
Step four, if the voltage value is detected to be Y, entering a 2-stage condition, performing 2-stage processing, and starting soft protection, including: and controlling the outdoor unit to stop and keeping the indoor fan to operate until a first preset time is reached, and then restarting the outdoor unit. If the bus voltage rises again and enters the level 2 condition again after the air conditioner recovers the normal operation, the processing process is repeated, but the retry is allowed at most three times, and after the three times, the abnormal condition caused by other reasons is considered to be required to be shut down and alarmed, and professional personnel are prompted to maintain, so that the safety of the air conditioner is protected.
And step five, if the voltage value is detected to be Z, entering a 3-level condition, performing 3-level processing, triggering a safety mechanism (namely a protection element) to act, and sending out shutdown alarm information to prompt a professional to check and repair.
In summary, aiming at the characteristic that the bus voltage of the electrolytic capacitor-free frequency conversion scheme is unstable, the problems can be effectively solved through the combination of real-time monitoring, three-level protection control and software and hardware, the normal operation of the air conditioner is guaranteed to the maximum extent, the fault loss is minimized, the level of the existing electrolytic capacitor frequency conversion scheme can be achieved in use, and the electrolytic capacitor frequency conversion scheme is superior to the electrolytic capacitor frequency conversion scheme in the aspects of economy, service life, machinability and the like.
Corresponding to the air conditioner in the embodiment of the present application, an embodiment of the present application further provides a voltage control method, which is applied to an air conditioner including an outdoor unit and an indoor unit, and the air conditioner further includes:
the power supply module comprises a direct current bus, wherein the direct current bus is not connected with an electrolytic capacitor for smoothing bus voltage, the power supply module also comprises a brake protection circuit, the brake protection circuit comprises a driving chip, a power switch tube and a power resistor, the driving chip is connected with the power switch tube, and the power switch tube and the power resistor are connected between the anode and the cathode of the direct current bus in series;
the controller is connected with the driving chip;
as shown in fig. 4, the method includes:
step S401, if the voltage value of the direct current bus is detected to be larger than a first preset voltage value and not larger than a second preset voltage value, a starting instruction is sent to the driving chip, so that the driving chip controls the power switch tube to be conducted;
step S402, if the power switch tube is in a conducting state and the voltage value is detected to be reduced to be not more than the first preset voltage value, sending a closing instruction to the driving chip so that the driving chip controls the power switch tube to be cut off;
the first preset voltage value is the highest value of the bus voltage within a preset fluctuation range.
In order to further ensure the reliability of the dc bus, in some embodiments of the present application, after issuing a shutdown command to the driving chip, the method further includes:
and if the voltage value is greater than the first preset voltage value and not greater than the second preset voltage value, sending the starting instruction to the driving chip so that the driving chip controls the power switch tube to be conducted.
In order to further improve the reliability of the dc bus, in some embodiments of the present application, the method further includes:
and if the voltage value is detected to be larger than the second preset voltage value and not larger than a third preset voltage value, controlling the outdoor unit to stop and keeping an indoor fan in the indoor unit to operate until the first preset time is reached, and restarting the outdoor unit.
In order to further improve the reliability of the dc bus, in some embodiments of the present application, the method further includes:
if the voltage value is detected to be greater than the second preset voltage value and not greater than the third preset voltage value after the outdoor unit is restarted, controlling the outdoor unit to be stopped, keeping the indoor fan to operate until the first preset time is reached, restarting the outdoor unit, and adding one to the retry times;
and if the retry times reach the preset times within a second preset time, stopping the indoor unit and the outdoor unit, and sending stop alarm information.
In order to ensure the safety of the dc bus, in some embodiments of the present application, a protection element is further connected in series to the dc bus, and the method further includes:
and if the voltage value is detected to be larger than the third preset voltage value and the protection element is triggered to be disconnected, sending shutdown alarm information.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims (10)

1. An air conditioner comprising:
an outdoor unit;
an indoor unit provided with an indoor fan;
it is characterized by also comprising:
the power supply module comprises a direct current bus, wherein the direct current bus is not connected with an electrolytic capacitor for smoothing bus voltage, the power supply module also comprises a brake protection circuit, the brake protection circuit comprises a driving chip, a power switch tube and a power resistor, the driving chip is connected with the power switch tube, and the power switch tube and the power resistor are connected between the anode and the cathode of the direct current bus in series;
a controller connected to the driving chip and configured to:
if the voltage value of the direct current bus is detected to be larger than a first preset voltage value and not larger than a second preset voltage value, sending a starting instruction to the driving chip to enable the driving chip to control the power switch tube to be conducted;
if the power switch tube is in a conducting state and the voltage value is detected to be reduced to be not more than the first preset voltage value, sending a closing instruction to the driving chip so that the driving chip controls the power switch tube to be cut off;
the first preset voltage value is the highest value of the bus voltage within a preset fluctuation range.
2. The air conditioner of claim 1, wherein the controller is further configured to:
and if the voltage value is detected to be larger than the second preset voltage value and not larger than a third preset voltage value, controlling the outdoor unit to stop and keeping the indoor fan to operate until the first preset time is reached, and restarting the outdoor unit.
3. The air conditioner of claim 2, wherein the controller is further configured to:
if the voltage value is detected to be greater than the second preset voltage value and not greater than the third preset voltage value after the outdoor unit is restarted, controlling the outdoor unit to be stopped, keeping the indoor fan to operate until the first preset time is reached, restarting the outdoor unit, and adding one to the retry times;
and if the retry times reach the preset times within a second preset time, stopping the indoor unit and the outdoor unit, and sending stop alarm information.
4. The air conditioner of claim 1, wherein a protection element is further connected in series with the dc bus, the controller further configured to:
and if the voltage value is detected to be larger than the third preset voltage value and the protection element is triggered to be disconnected, sending shutdown alarm information.
5. The air conditioner of claim 1, wherein the controller is further configured to:
after a closing instruction is sent to the driving chip, if the voltage value is larger than the first preset voltage value and not larger than the second preset voltage value, the opening instruction is sent to the driving chip, so that the driving chip controls the power switch tube to be conducted.
6. A voltage control method is applied to an air conditioner comprising an outdoor unit and an indoor unit, and is characterized in that the air conditioner further comprises the following steps:
the power supply module comprises a direct current bus, wherein the direct current bus is not connected with an electrolytic capacitor for smoothing bus voltage, the power supply module also comprises a brake protection circuit, the brake protection circuit comprises a driving chip, a power switch tube and a power resistor, the driving chip is connected with the power switch tube, and the power switch tube and the power resistor are connected between the anode and the cathode of the direct current bus in series;
the controller is connected with the driving chip;
the method comprises the following steps:
if the voltage value of the direct current bus is detected to be larger than a first preset voltage value and not larger than a second preset voltage value, sending a starting instruction to the driving chip to enable the driving chip to control the power switch tube to be conducted;
if the power switch tube is in a conducting state and the voltage value is detected to be reduced to be not more than the first preset voltage value, sending a closing instruction to the driving chip so that the driving chip controls the power switch tube to be cut off;
the first preset voltage value is the highest value of the bus voltage within a preset fluctuation range.
7. The method of claim 6, wherein the method further comprises:
and if the voltage value is detected to be larger than the second preset voltage value and not larger than a third preset voltage value, controlling the outdoor unit to stop and keeping an indoor fan in the indoor unit to operate until the first preset time is reached, and restarting the outdoor unit.
8. The method of claim 7, wherein the method further comprises:
if the voltage value is detected to be greater than the second preset voltage value and not greater than the third preset voltage value after the outdoor unit is restarted, controlling the outdoor unit to be stopped, keeping the indoor fan to operate until the first preset time is reached, restarting the outdoor unit, and adding one to the retry times;
and if the retry times reach the preset times within a second preset time, stopping the indoor unit and the outdoor unit, and sending stop alarm information.
9. The method of claim 6, wherein a protection element is further connected in series with the dc bus, the method further comprising:
and if the voltage value is detected to be larger than the third preset voltage value and the protection element is triggered to be disconnected, sending shutdown alarm information.
10. The method of claim 6, wherein after issuing a shutdown instruction to the driver chip, the method further comprises:
and if the voltage value is greater than the first preset voltage value and not greater than the second preset voltage value, sending the starting instruction to the driving chip so that the driving chip controls the power switch tube to be conducted.
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