CN112303707B - Air conditioner and voltage control method - Google Patents
Air conditioner and voltage control method Download PDFInfo
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- CN112303707B CN112303707B CN202011101083.5A CN202011101083A CN112303707B CN 112303707 B CN112303707 B CN 112303707B CN 202011101083 A CN202011101083 A CN 202011101083A CN 112303707 B CN112303707 B CN 112303707B
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- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000003990 capacitor Substances 0.000 claims abstract description 18
- 238000009499 grossing Methods 0.000 claims description 7
- 230000001960 triggered effect Effects 0.000 claims description 7
- 230000009471 action Effects 0.000 abstract description 4
- 230000001276 controlling effect Effects 0.000 description 12
- 230000002159 abnormal effect Effects 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000000630 rising effect Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000004378 air conditioning Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035484 reaction time Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- 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
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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
- F24F11/32—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
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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
-
- 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 application 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 the first preset voltage value and not larger than the 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 direct current bus voltage is accurately controlled when the direct current bus is not connected with the electrolytic capacitor.
Description
Technical Field
The present application relates to the field of air conditioner control, and more particularly, to an air conditioner and a voltage control method.
Background
In the variable-frequency air conditioner, an electrolytic capacitor on a 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 because 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, benefits 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 abnormal bus voltage is controlled, the sudden rise can occur, the damage of related electric parts can be caused, and the air conditioner is caused to fail.
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, thereby improving the reliability of the air conditioner is a technical problem to be solved at present.
Disclosure of Invention
The application provides an air conditioner, comprising:
an outdoor unit;
the indoor unit is provided with an indoor fan;
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 the bus voltage, the power supply module further 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 in series between the positive pole and the negative pole of the direct current bus;
and 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, an opening instruction is sent to the driving chip so that the driving chip controls 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, a closing instruction is sent to the driving chip, so that the driving chip controls the power switch tube to be closed;
the first preset voltage value is the highest value of the bus voltage in a preset fluctuation range.
In some embodiments of the 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 the third preset voltage value, controlling the outdoor unit to stop and keeping the indoor fan to run until the first preset time is reached, and restarting the outdoor unit.
In some embodiments of the application, the controller is further configured to:
if the voltage value is detected to be larger than the second preset voltage value and not larger than the third preset voltage value after restarting the outdoor unit, controlling the outdoor unit to stop and keep the indoor fan running until the first preset time is reached, restarting the outdoor unit, and adding one to the retry number;
and if the retry times reach the preset times within the second preset time, stopping the indoor unit and the outdoor unit, and sending out stop alarm information.
In some embodiments of the present application, the dc bus is further connected in series with a protection element, 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 out shutdown alarm information.
In some embodiments of the 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 application also provides a voltage control method which is applied to the air conditioner comprising the outdoor unit and the 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 the bus voltage, the power supply module further 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 in series between the positive pole and the negative pole of the direct current bus;
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, an opening instruction is sent to the driving chip so that the driving chip controls 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, a closing instruction is sent to the driving chip, so that the driving chip controls the power switch tube to be closed;
the first preset voltage value is the highest value of the bus voltage in a preset fluctuation range.
In some embodiments of the 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 the third preset voltage value, controlling the outdoor unit to stop and keeping the indoor fan in the indoor unit to run until the first preset time is reached, and restarting the outdoor unit.
In some embodiments of the application, the method further comprises:
if the voltage value is detected to be larger than the second preset voltage value and not larger than the third preset voltage value after restarting the outdoor unit, controlling the outdoor unit to stop and keep the indoor fan running until the first preset time is reached, restarting the outdoor unit, and adding one to the retry number;
and if the retry times reach the preset times within the second preset time, stopping the indoor unit and the outdoor unit, and sending out 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 out shutdown alarm information.
In some embodiments of the present application, after sending a shutdown instruction to the driver chip, the method further includes:
and if the voltage value is larger than the first preset voltage value and not larger 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 larger than the first preset voltage value and not larger than the 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 the 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, alarm and shutdown are not triggered, and 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 the third preset voltage value, the outdoor unit is controlled to stop and keep the indoor fan running until the first preset time is reached, the outdoor unit is restarted, and software protection measures are adopted to accurately control the voltage of the direct current bus on the premise of not affecting the use of a user, so that the user experience is improved;
and if the voltage value is detected to be larger than the third preset voltage value, triggering the protection element to be disconnected, sending out shutdown alarm information, and ensuring the safety of the direct current bus based on hardware protection measures.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic structural diagram of an air conditioner according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a power module according to an embodiment of the present application;
FIG. 3 is a schematic diagram showing the effect of a voltage control method according to an embodiment of the present application;
fig. 4 shows an effect of a voltage control method according to another embodiment of the application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the description of the present application, it should 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 the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.
The terms "first," "second," and the like, 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 defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases 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, wherein a compressor is provided in the outdoor unit 101;
an indoor unit 102, wherein the indoor unit 102 is provided with an indoor fan;
further comprises:
the power supply module 103, as shown in fig. 2, comprises a direct current bus, wherein the direct current bus is not connected with an electrolytic capacitor for smoothing the bus voltage, the power supply module 103 further comprises a brake protection circuit, the brake protection circuit comprises a driving chip (i.e. a driving IC), 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 in series between the positive pole and the negative pole of the direct current bus;
a controller 104 (i.e., MCU) 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, an opening instruction is sent to the driving chip so that the driving chip controls 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, a closing instruction is sent to the driving chip, so that the driving chip controls the power switch tube to be closed;
the first preset voltage value is the highest value of the bus voltage in a preset fluctuation range.
The national power grid can generate 10% fluctuation of the regulated power supply voltage, so that the air conditioner can be ensured to normally operate in the range, and an accurate range is determined in advance through the operation of all working conditions and all loads, wherein the 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 bus voltage is set to be the first preset voltage value under the normal condition.
The controller detects the voltage value of the direct current bus in real time, optionally based on a special voltage division detection circuit or 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 bus voltage is increased but the amplitude and the energy are not large under the condition, so that the direct current bus can be processed by adopting a brake protection circuit, and an opening instruction is sent to the driving chip so that the driving chip can control the power switch tube to be conducted. Specifically, as shown in fig. 2, the driving chip controls the power switch tube to be turned on, because the power resistor and the power switch tube are directly connected in series between the positive electrode and the negative electrode of the direct current bus, the power switch tube has almost no resistance value after being turned on, which is equivalent to instantly turning on the positive electrode and the negative electrode of the bus through the power resistor, thereby rapidly releasing the energy for pushing up the voltage of the direct current bus to rise in the form of heat energy of the power resistor, reducing the voltage of the direct current bus, and optionally, the continuous working time of the power resistor is longer than a preset threshold value.
If the power switch tube is in a conducting state and the voltage value is detected to be not more than the first preset voltage value, the voltage value of the direct current bus is indicated to be recovered to be normal under the action of the brake protection circuit, and the controller sends a closing instruction to the driving chip so that the driving chip controls the power switch tube to be closed, the brake protection circuit is closed, the power resistor is powered off, and the direct current bus is recovered to be in a normal state.
The normal operation of the air conditioner is not affected during the working period of the brake protection circuit, and the conditions of shutdown, alarm and the like can not occur.
To further ensure the reliability of the dc bus, in some embodiments of the 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 a closing instruction is sent to the driving chip to stop the operation of the brake protection circuit, if the voltage value of the dc bus is increased 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 opening instruction is sent to the driving chip, so that the driving chip controls the power switch to be turned on, so that the brake protection circuit may be operated for multiple times, the dc bus voltage may be restored to be normal without affecting the normal operation of the air conditioner, optionally, the number of times of operation of the brake protection circuit within a preset time period may be recorded, after the number of times reaches a specified number, an abnormality that the circuit cannot recover from exists may be described, and an alarm message may be sent to prompt a maintainer to process in time.
To further improve the reliability of the dc bus, in some embodiments of the 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 the third preset voltage value, controlling the outdoor unit to stop and keeping the indoor fan to run until the first preset time is reached, and restarting the outdoor unit.
In this embodiment, if the voltage value is detected to be greater than the second preset voltage value and not greater than the third preset voltage value, it is indicated that the dc bus voltage is higher and the rising time is faster, the energy is larger, and the processing cannot be performed through the brake protection circuit, at this time, the outdoor unit is controlled to stop and keep operating until reaching the first preset time, and then the outdoor unit is restarted, specifically, the outdoor unit includes a compressor, and the outdoor unit is controlled to stop and equivalent to disconnect a part of the load on the dc bus, such as a compressor variable frequency power supply, so that the dc bus voltage can be reduced, in order not to affect the use of the user, the indoor fan is kept to continue operating, and the outdoor unit is restarted after reaching the first preset time, so that the air conditioner resumes normal operation, and by temporarily stopping only the outdoor unit, the user experience is not affected while the bus voltage is reduced.
To further improve the reliability of the dc bus, in some embodiments of the application, the controller is further configured to:
if the voltage value is detected to be larger than the second preset voltage value and not larger than the third preset voltage value after restarting the outdoor unit, controlling the outdoor unit to stop and keep the indoor fan running until the first preset time is reached, restarting the outdoor unit, and adding one to the retry number;
and if the retry times reach the preset times within the second preset time, stopping the indoor unit and the outdoor unit, and sending out 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 period 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, the outdoor unit can be controlled to stop again and keep the indoor fan running, the outdoor unit is restarted until the first preset time period is reached, the retry number is increased by one, and if the retry number reaches the preset number in the second preset time period, for example, three times, the problem is that other reasons cause abnormal need to alert and prompt a professional to maintain, so as to protect the safety of air conditioning equipment, the indoor unit and the outdoor unit are stopped, and stop alarm information is sent out.
In order to ensure the safety of the direct current bus, in some embodiments of the present application, the direct current bus is further connected with a protection element in series, 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 out 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 rising time is very fast, so that the energy is huge, and the shutdown protection may not be performed, so as 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 replaced quickly, for example: and the fuse, the pressure sensor and the like are used for triggering the protection element to be disconnected when the voltage value is larger than the third preset voltage value, disconnecting the direct current bus to protect other devices and generating shutdown alarm information so as to prompt maintenance personnel to process.
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 the first preset voltage value and not larger than the 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 the 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;
if the voltage value is detected to be larger than the second preset voltage value and not larger than the third preset voltage value, controlling the outdoor unit to stop and keeping the indoor fan to run, restarting the outdoor unit until the first preset time is reached, and accurately controlling the voltage of the direct current bus on the premise of not affecting the use of a user by adopting software protection measures;
and if the voltage value is detected to be larger than the third preset voltage value, triggering the protection element to be disconnected, sending out shutdown alarm information, and ensuring the safety of the direct current bus based on hardware protection measures.
In order to further explain the technical idea of the application, the technical scheme of the application is described with specific application scenarios.
The air conditioner product has no electrolytic capacitor and the DC bus voltage is equal to the loss of protection. After the air conditioner is started, the voltage of the direct current bus is in a regular oscillation state after the compressor starts to operate, as the ascending load of the compressor increases, the voltage oscillation of the direct current bus also increases, the oscillation is in the control range of the electroless frequency conversion scheme and is normal, but if abnormal conditions such as power failure, abnormal chip reset, rapid frequency reduction or step-out of the compressor occur in the period, the rapid rising of the voltage of the direct current bus can be generated, the overvoltage of devices in the period is damaged, so that the abnormal abrupt change of the voltage of the direct current bus is prevented, and related electric parts are protected, and aiming at the problem, the embodiment of the application provides a voltage control method which is applied to the 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 the bus voltage, the power supply module further 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 in series between the positive pole and the negative pole of the direct current bus;
the controller is connected with the driving chip;
as shown in fig. 3, the method includes:
step one, monitoring the voltage value of a direct current bus in real time when the air conditioner is in normal operation.
If the voltage value is abnormal, judging the abnormal level, dividing the abnormal level into a level 1 condition, a level 2 condition and a level 3 condition according to the magnitude of the voltage value, setting the bus voltage to be M at the highest under the normal condition, and setting the bus voltage to be X (X > M) when the bus voltage exceeds the normal value under the level 1 condition; the bus voltage exceeds a normal value under the condition of the level 2, and is set as Y (Y > X); and in the case of the 3-stage, the bus voltage exceeds a normal value and is set as Z (Z > Y).
Step three, if the voltage value is X, the step 1 is entered, the step 1 is processed, including brake opening, so that the brake protection circuit acts, as shown in fig. 2, the driving chip works to control the power switch tube to be conducted, and as the power resistor and the power switch tube are directly connected in series between the positive electrode and the negative electrode of the direct current bus, the power switch tube has almost no resistance value after being conducted, which is equivalent to instantly conducting the positive electrode and the negative electrode of the bus through the power resistor, thereby rapidly releasing the energy for pushing up the voltage of the direct current bus in the form of heat energy of the power resistor, and reducing 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-level condition, performing 2-level processing, and starting soft protection, wherein the step four comprises the following steps: and controlling the outdoor unit to stop and keeping the indoor fan running until the first preset time is reached, and restarting the outdoor unit. If the bus voltage rises to enter the level 2 again in a short time after the air conditioner is recovered to normal operation, repeating the processing process, wherein the retry is allowed for three times at most, and the condition that the air conditioner is in abnormal condition due to other reasons is considered to be in need of stopping for alarming after the retry is allowed for three times, so that professional staff is prompted to maintain the air conditioner, and the safety of the air conditioner is protected.
And fifthly, 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 a shutdown alarm message to prompt a professional to check and maintain.
In summary, aiming at the characteristic of unstable bus voltage of the electrolytic capacitor-free frequency conversion scheme, the problems can be effectively solved through the mode of combining real-time monitoring, three-stage protection control and software and hardware, the normal operation of an air conditioner is ensured to the greatest extent, the loss of faults is minimized, the level of the conventional electrolytic capacitor frequency conversion scheme can be achieved in use, but the method is superior to the electrolytic capacitor frequency conversion scheme in the aspects of economy, service life, processability and the like.
Corresponding to the air conditioner in the embodiment of the application, the embodiment of the application also provides a voltage control method which is applied to the 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 the bus voltage, the power supply module further 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 in series between the positive pole and the negative pole of the direct current bus;
the controller is connected with the driving chip;
as shown in fig. 4, the method includes:
step S401, if it is detected that the voltage value of the dc bus is greater than the first preset voltage value and not greater than the second preset voltage value, an on command is sent to the driving chip, so that the driving chip controls the power switch to be turned on;
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, a closing instruction is sent to the driving chip so that the driving chip controls the power switch tube to be closed;
the first preset voltage value is the highest value of the bus voltage in a preset fluctuation range.
To further ensure the reliability of the dc bus, in some embodiments of the present application, after sending a shutdown instruction to the driving chip, the method further includes:
and if the voltage value is larger than the first preset voltage value and not larger 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 the third preset voltage value, controlling the outdoor unit to stop and keeping the indoor fan in the indoor unit to run 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 larger than the second preset voltage value and not larger than the third preset voltage value after restarting the outdoor unit, controlling the outdoor unit to stop and keep the indoor fan running until the first preset time is reached, restarting the outdoor unit, and adding one to the retry number;
and if the retry times reach the preset times within the second preset time, stopping the indoor unit and the outdoor unit, and sending out stop alarm information.
In order to ensure the safety of the direct current bus, in some embodiments of the present application, a protection element is further connected in series to the direct current 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 out shutdown alarm information.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application has been described in detail with reference to the foregoing embodiments, it will be appreciated by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not drive the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present application.
Claims (6)
1. An air conditioner, comprising:
an outdoor unit;
the indoor unit is provided with an indoor fan;
characterized by 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 the bus voltage, the power supply module further 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 in series between the positive pole and the negative pole of the direct current bus;
and 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, an opening instruction is sent to the driving chip so that the driving chip controls 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, a closing instruction is sent to the driving chip, so that the driving chip controls the power switch tube to be closed;
the first preset voltage value is the highest value of the bus voltage in a preset fluctuation range;
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 run until reaching a first preset time period, and restarting the outdoor unit; if the voltage value is detected to be larger than the second preset voltage value and not larger than the third preset voltage value after restarting the outdoor unit, controlling the outdoor unit to stop and keep the indoor fan running until the first preset time is reached, restarting the outdoor unit, and adding one to the retry number; and if the retry times reach the preset times within the second preset time, stopping the indoor unit and the outdoor unit, and sending out stop alarm information.
2. The air conditioner of claim 1, wherein the dc bus is further connected in series with a protection element, the controller being 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 out shutdown alarm information.
3. 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.
4. A voltage control method applied to an air conditioner comprising an outdoor unit and an indoor unit, the air conditioner 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 the bus voltage, the power supply module further 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 in series between the positive pole and the negative pole of the direct current bus;
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, an opening instruction is sent to the driving chip so that the driving chip controls 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, a closing instruction is sent to the driving chip, so that the driving chip controls the power switch tube to be closed;
the first preset voltage value is the highest value of the bus voltage in a preset fluctuation range;
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 in the indoor unit to run until the first preset time is reached, and restarting the outdoor unit; if the voltage value is detected to be larger than the second preset voltage value and not larger than the third preset voltage value after restarting the outdoor unit, controlling the outdoor unit to stop and keep the indoor fan running until the first preset time is reached, restarting the outdoor unit, and adding one to the retry number; and if the retry times reach the preset times within the second preset time, stopping the indoor unit and the outdoor unit, and sending out stop alarm information.
5. The method of claim 4, wherein the dc bus is further connected in series with a protection element, 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 out shutdown alarm information.
6. The method of claim 4, wherein after issuing a shutdown instruction to the driver chip, the method further comprises:
and if the voltage value is larger than the first preset voltage value and not larger 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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| CN112910232B (en) * | 2021-03-19 | 2022-04-19 | 青岛海信日立空调系统有限公司 | Air conditioning system |
| CN113346731B (en) * | 2021-05-10 | 2023-01-20 | Tcl空调器(中山)有限公司 | Compressor shutdown circuit and method and air conditioner |
| CN113280468A (en) * | 2021-06-15 | 2021-08-20 | 佛山市顺德区美的电子科技有限公司 | Operation control method of air conditioner, air conditioner and computer readable storage medium |
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