CN113873836A - Temperature and humidity control method and device of frequency converter, frequency converter and air conditioning unit - Google Patents
Temperature and humidity control method and device of frequency converter, frequency converter and air conditioning unit Download PDFInfo
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- CN113873836A CN113873836A CN202111124409.0A CN202111124409A CN113873836A CN 113873836 A CN113873836 A CN 113873836A CN 202111124409 A CN202111124409 A CN 202111124409A CN 113873836 A CN113873836 A CN 113873836A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20209—Thermal management, e.g. fan control
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a temperature and humidity control method and device of a frequency converter, the frequency converter and an air conditioning unit. Wherein, the method comprises the following steps: after a frequency converter is powered on, acquiring a temperature value and a relative humidity value inside a shell of the frequency converter; and controlling the electrifying states of the charging resistor and the discharging resistor in the converter according to the temperature value and the relative humidity value. According to the invention, the temperature and the relative humidity in the shell of the frequency converter can be controlled on the basis of not increasing the hardware structure in the frequency converter, and the cost is reduced.
Description
Technical Field
The invention relates to the technical field of units, in particular to a temperature and humidity control method and device of a frequency converter, the frequency converter and an air conditioning unit.
Background
Because the electronic component inside the converter has higher requirements on the temperature and the relative humidity during working, when the ring temperature is too low or the humidity is too high, the temperature is too low, and the service life of components can be reduced. When the inside temperature of converter was crossed excessively in addition, if humidity was too high, the internal portion of cabinet will produce the condensation, reduces converter operational reliability.
The dehumidification mode that present converter was used commonly heats for heating units such as adoption dampproofing moisture absorption bag or collocation electric fan heater usually, adopts dampproofing moisture absorption bag to need regular manual change, and the practicality is poor, and requires the change personnel to have certain operation level, and adopts built-in heating units's such as electric fan heater mode, can lead to converter inner structure complicacy, increase cost. Therefore, how to effectively control the temperature and humidity inside the frequency converter at low cost and improve the reliability of the frequency converter becomes a technical problem to be solved urgently.
Aiming at the problems that the temperature and humidity scheme inside the frequency converter in the prior art can lead to the internal structure of the frequency converter to be complex and the cost to be higher, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a temperature and humidity control method and device for a frequency converter, the frequency converter and an air conditioning unit, and aims to solve the problems that in the prior art, the temperature and humidity control scheme inside the frequency converter causes the internal structure of the frequency converter to be complex and the cost to be high.
In order to solve the technical problem, the invention provides a temperature and humidity control method of a frequency converter, wherein the method comprises the following steps:
after a frequency converter is powered on, acquiring a temperature value and a relative humidity value inside a shell of the frequency converter;
and controlling the electrifying states of the charging resistor and the discharging resistor in the converter according to the temperature value and the relative humidity value.
Further, controlling the energization states of the charging resistor and the discharging resistor inside the converter according to the temperature value and the relative humidity value includes:
judging whether the temperature value is greater than or equal to a first threshold value and the relative humidity value is less than or equal to a second threshold value;
if yes, controlling the charging resistor and the discharging resistor not to be electrified, and directly controlling the frequency converter to start to operate.
Further, after determining whether the temperature value is greater than or equal to a first threshold value and the relative humidity value is less than or equal to a second threshold value, the method further includes:
if not, controlling a charging resistor and a discharging resistor in the frequency converter to be electrified;
and monitoring the temperature value and the relative humidity value until the temperature value is greater than or equal to a first threshold value, and controlling the charging resistor to be in short circuit, controlling the discharging resistor to be powered off and then controlling the frequency converter to start to operate after the relative humidity value is less than or equal to a second threshold value.
Further, controlling the charging resistance short circuit includes:
controlling the contactor to be closed to enable the charging resistor to be in short circuit; wherein the contactor is arranged in parallel with the charging resistor.
Further, while controlling the charging resistance and the discharging resistance in the frequency converter to be electrified, the method further comprises the following steps:
and controlling a fan inside the frequency converter shell to be started.
Further, before determining whether the temperature value is greater than or equal to a first threshold and the relative humidity value is less than or equal to a second threshold, the method further includes:
acquiring the power waiting time of the frequency converter; the power waiting time is the accumulated time of the frequency converter in an unused state;
and controlling the charging time of the direct current bus capacitor in the converter according to the waiting time.
Further, controlling the charging duration of the direct current bus capacitor in the converter according to the waiting duration, including:
judging whether the power waiting time is less than a first preset time;
if yes, controlling the direct current bus capacitor to be charged for a second preset time, and then triggering and judging whether the temperature value is greater than or equal to a first threshold value and the relative humidity value is smaller than or equal to a second threshold value;
if not, controlling the direct current bus capacitor to be charged for a third preset time, and then triggering and judging whether the temperature value is greater than or equal to a first threshold value and the relative humidity value is less than or equal to a second threshold value;
and the third preset time length is greater than the second preset time length.
The invention also provides a temperature and humidity control device of the frequency converter, which comprises:
the acquisition module is used for acquiring a temperature value and a relative humidity value inside the shell of the frequency converter after the frequency converter is powered on;
and the main control board is used for controlling the electrifying states of the charging resistor and the discharging resistor in the converter according to the temperature value and the relative humidity value.
The invention also provides a frequency converter, which comprises a shell, a charging resistor, a discharging resistor and a temperature and humidity control device of the frequency converter.
Further, the frequency converter further includes:
and the fan is arranged inside the frequency converter shell.
The invention also provides an air conditioning unit which comprises the frequency converter.
The invention also provides a computer readable storage medium, on which a computer program is stored, which when executed by a processor implements the temperature and humidity control method of the frequency converter.
By applying the technical scheme of the invention, the electrifying state of the charging resistor and the discharging resistor in the converter is controlled according to the temperature value and the relative humidity value in the shell of the frequency converter, and when the temperature and the relative humidity of the frequency converter do not meet the operating conditions of the frequency converter, the electrifying and heat release of the charging resistor and the discharging resistor in the converter are controlled, so that the temperature is increased, the relative humidity is reduced, a heating unit is not required to be additionally arranged, the temperature and the relative humidity in the shell of the frequency converter can be controlled on the basis of not increasing the hardware structure in the frequency converter, and the cost is reduced.
Drawings
Fig. 1 is a flowchart of a temperature and humidity control method according to an embodiment of the present invention;
fig. 2 is a flowchart of a temperature and humidity control method of a frequency converter according to another embodiment of the invention;
fig. 3 is a block diagram of a temperature and humidity control apparatus of a frequency converter according to an embodiment of the present invention;
fig. 4 is a block diagram of a temperature and humidity control apparatus of a frequency converter according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a frequency converter according to an embodiment of the present invention;
fig. 6 is an internal circuit diagram of a frequency converter according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, etc. may be used to describe the thresholds in embodiments of the present invention, the thresholds should not be limited to these terms. These terms are only used to distinguish the thresholds for different parameters. For example, the first threshold may also be referred to as a second threshold, and similarly, the second threshold may also be referred to as a first threshold, without departing from the scope of embodiments of the present invention.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
This embodiment provides a temperature and humidity control method for a frequency converter, and fig. 1 is a flowchart of a temperature and humidity control method according to an embodiment of the present invention, and as shown in fig. 1, the method includes:
s101, after the frequency converter is powered on, obtaining a temperature value and a relative humidity value inside the shell of the frequency converter.
When concrete implementation, can detect above-mentioned temperature value and relative humidity value through temperature sensor and humidity transducer, temperature sensor and humidity transducer set up in the inside of converter casing, can be connected with the main control board of converter through wireless connection or signal transmission line to transmit the temperature value and the relative humidity value that detect to the main control board.
And S102, controlling the electrifying states of the charging resistor and the discharging resistor in the converter according to the temperature value and the relative humidity value in the shell of the frequency converter.
The main control board receives the temperature value and the relative humidity value transmitted by the temperature sensor and the humidity sensor, then carries out operation, controls the electrifying state of the charging resistor and the discharging resistor inside the converter according to the comparison result of the temperature value and the pre-stored humidity threshold value and the comparison result of the relative humidity value and the pre-stored humidity threshold value, and can improve the temperature inside the shell of the frequency converter and simultaneously reduce the relative humidity inside the shell of the frequency converter by electrifying and heating the charging resistor and the discharging resistor.
According to the temperature and humidity control method of the frequency converter, the electrifying states of the charging resistor and the discharging resistor in the converter are controlled according to the temperature value and the relative humidity value, when the temperature and the relative humidity of the frequency converter do not meet the running conditions of the frequency converter, the electrifying heat release of the charging resistor and the discharging resistor in the converter is controlled, the temperature is increased, meanwhile, the relative humidity is reduced, a heating unit is not needed to be additionally arranged, the temperature and the relative humidity in a shell of the frequency converter can be controlled on the basis of not increasing the hardware structure in the frequency converter, and the cost is reduced.
Example 2
In this embodiment, in order to accurately control the temperature and the relative humidity inside the casing of the frequency converter, the step S102 specifically includes: judging whether the temperature value is greater than or equal to a first threshold value and the relative humidity value is less than or equal to a second threshold value; if so, indicating that the temperature and the relative humidity inside the shell of the frequency converter meet the operating conditions of the frequency converter, controlling the charging resistor and the discharging resistor not to be electrified at the moment, and directly controlling the frequency converter to start operating. After the frequency converter starts to operate, the charging resistor and the discharging resistor are controlled to be powered on or powered off according to control logic inherent in the frequency converter.
After judging whether the temperature value is greater than or equal to the first threshold value and the relative humidity value is less than or equal to the second threshold value, if the judgment result is negative, the temperature and the relative humidity inside the shell of the frequency converter do not meet the operation conditions of the frequency converter at present, and at the moment, a charging resistor and a discharging resistor in the frequency converter are controlled to be electrified; the temperature in the shell of the frequency converter is improved and the relative humidity is reduced by electrifying the charging resistor and the discharging resistor to release heat.
After controlling the charging resistor and the discharging resistor in the frequency converter to be electrified, continuously monitoring the temperature value and the relative humidity value in the shell of the frequency converter until the temperature value is greater than or equal to a first threshold value, and after the relative humidity value is less than or equal to a second threshold value, controlling the charging resistor to be in short circuit, controlling the discharging resistor to be powered off, and then controlling the frequency converter to start to operate. Specifically, the control of the short circuit of the charging resistor includes: controlling the contactor to be closed to enable the charging resistor to be in short circuit; wherein, the contactor is connected in parallel with the charging resistor. The power-off of the discharge resistor can be controlled by controlling the switch connected in series with the discharge resistor to be switched off.
In order to increase the air flow speed inside the frequency converter shell, a fan can be further arranged inside the frequency converter shell, and the fan inside the frequency converter shell is controlled to be turned on while the charging resistor and the discharging resistor in the frequency converter are controlled to be powered on, so that the air flow speed inside the frequency converter shell is accelerated, and the inside of the frequency converter shell is heated uniformly.
If the converter does not use for a long time, electrolytic capacitor probably leaks electricity, lead to the unable quick charge of busbar voltage to the target value, at this moment, start the converter in the short time, can lead to the converter can not normally work, consequently, the inside temperature of non-light inverter casing and relative humidity need satisfy the operating condition, the time of waiting to the electricity of converter also can not the overlength, if the time of waiting to the electricity of converter, need charge the long time and can start, consequently, judge that the temperature value is greater than or equal to first threshold value, and before the relative humidity value is less than or equal to the second threshold value and is established, above-mentioned method still includes: acquiring the power waiting time of the frequency converter; the power waiting time is the accumulated time of the frequency converter in an unused state; and controlling the charging time of the direct current bus capacitor in the converter according to the waiting time. Specifically, controlling the charging duration of the dc bus capacitor in the converter according to the waiting duration includes: judging whether the power waiting time is less than a first preset time; if so, controlling the direct current bus capacitor to charge for a second preset time, and then triggering and judging whether the temperature value is greater than or equal to the first threshold value and the relative humidity value is less than or equal to the second threshold value; if not, controlling the direct current bus capacitor to charge for a third preset time, then triggering and judging whether the temperature value is greater than or equal to the first threshold value and the relative humidity value is less than or equal to the second threshold value, wherein the third preset time period is longer than the second preset time period, for example, the second preset time period may be set to 5s, and the third preset time period may be set to 30min, that is, no matter whether the waiting time period is longer than the first preset time period, the dc bus capacitor will be charged, and the charging is normally performed for about 5s, but the electrolyte devices such as electrolytic capacitors and the like have the problems of electrolyte leakage, capacitor bulge and the like caused by long-time non-use, the problems that a three-phase rectifying circuit is difficult to charge to more than 450V and a large leakage current occurs when a capacitor is suddenly increased in voltage can be solved by charging an electrolytic capacitor which is not used for a long time. In this embodiment, the first preset time period may be obtained through an experimental test, for example, the first preset time period may be set to 180 days, and the second preset time period may be set according to a characteristic of a dc bus capacitor in the frequency converter, so that the dc bus capacitor can be fully charged after the second preset time period is satisfied.
Fig. 2 is a flowchart of a temperature and humidity control method of a frequency converter according to another embodiment of the present invention, as shown in fig. 2, the method includes:
and S1, after the frequency converter is powered on, acquiring the last time when the frequency converter is powered off.
If the converter does not use for a long time, the electric quantity of its inside direct current bus electric capacity probably exhausts, at this moment, directly start the converter, can lead to the converter can not normally work, consequently, do not have the inside temperature of light inverter casing and relative humidity to need satisfy the operating condition, the converter also can not use for a long time, it is long in order to calculate the converter time of not using to obtain the moment that the converter was last shut down, so that judge whether the electric quantity of direct current bus electric capacity exhausts.
S2, judging whether the interval duration between the current time and the last shutdown time is less than the preset duration or not; if so, step S4 is executed directly, and if not, step S3 is executed and then step S4 is executed.
And S3, prompting that the frequency converter is not used for a long time and please charge completely, and controlling the direct current bus capacitor to charge for a third preset time.
And S4, controlling the direct current bus capacitor to charge for a second preset time.
S5, judging whether the temperature value is larger than or equal to the first threshold value and the relative humidity value is smaller than or equal to the second threshold value; if yes, step S7 is executed, and if no, after step S6 is executed, the process returns to step S5.
And S6, prompting that the temperature and the humidity do not meet the operation conditions, controlling the charging resistor and the discharging resistor to be electrified and release heat, and controlling the fan to be started.
And S7, controlling the short circuit of the charging resistor, controlling the power failure of the discharging resistor and controlling the fan to be turned off.
Judging whether the temperature value is greater than or equal to a first threshold value and the relative humidity value is less than or equal to a second threshold value; if so, indicating that the temperature and the relative humidity inside the shell of the frequency converter meet the operating conditions of the frequency converter, controlling the charging resistor and the discharging resistor not to be electrified at the moment, and directly controlling the frequency converter to start operating. After the frequency converter starts to operate, the charging resistor and the discharging resistor are controlled to be powered on or powered off according to control logic inherent in the frequency converter. The first threshold and the second threshold may be set according to the performance of the electronic components in the frequency converter, for example, the first threshold is set to-20 ℃ and the second threshold is set to 60%.
And S8, controlling the frequency converter to start running.
In specific implementation, after the power is turned on, a rectifying circuit in the frequency converter is controlled to be powered on, and the direct-current bus capacitor is charged through the charging resistor. The temperature and humidity sensor detects the internal temperature and relative humidity of the shell of the current frequency converter, the operating conditions of the frequency converter allowing the startup operation can be set to be that the temperature in the shell is higher than-20 ℃, the relative humidity is lower than 60%, and the detection distance of the main control board is less than 180 days from the last startup. And when all the starting conditions are met, the frequency converter receives a user starting instruction and operates.
If the temperature and the relative humidity in the shell reach the standards and the detection distance of the main control board is less than 180 days after the shell is started last time, the starting condition of the frequency converter is met, the frequency converter is allowed to run, after the starting instruction is received, the direct-current bus capacitor is controlled to be charged for 5s, the contactor connected with the charging resistor in parallel is controlled to be attracted, the charging resistor is short-circuited, and the IGBT module in the inverter circuit starts to work; the main control board detects that the time is less than 180 days before starting, then a reminding message of 'the inverter is not used for a long time and completely charges' is displayed on the operation display screen, at the same time, the direct current bus capacitor is controlled to be continuously charged, meanwhile, the main control board calculates the charging time, when the charging time of the direct current bus capacitor is detected to be more than or equal to 30min, whether the temperature and the relative humidity in the shell meet the operation condition of the inverter or not is continuously judged, if the temperature and the relative humidity in the shell do not meet the operation condition of the inverter, the reminding message of 'the temperature and the humidity do not meet the operation condition' is displayed on the operation display screen, current is controlled to pass through the charging resistor and the discharging resistor, so that the charging resistor and the discharging resistor start to generate heat, meanwhile, the cooling fan is controlled to be electrified to operate, the air thermal cycle in the inverter is accelerated until the temperature and the relative humidity in the shell meet the operation condition of the inverter, clearing prompt information on a display screen, then controlling a contactor connected with the charging resistor in parallel to be attracted, enabling the charging resistor to be short-circuited, allowing the frequency converter to receive a user starting instruction, and after receiving the user starting instruction, starting the frequency converter to operate, wherein an IGBT module of the inverter circuit starts to work.
Example 3
The present embodiment provides a computer-readable storage medium on which a computer program is stored, where the program is executed by a processor to implement the temperature and humidity control method of the frequency converter in the above-mentioned embodiments.
Example 4
Based on the same inventive concept as the above embodiments, this embodiment provides a temperature and humidity control apparatus for an inverter, and fig. 3 is a block diagram of a structure of the temperature and humidity control apparatus for an inverter according to the embodiment of the present invention, and as shown in fig. 3, the apparatus includes:
the obtaining module 10 is configured to obtain a temperature value and a relative humidity value inside a casing of the frequency converter after the frequency converter is powered on.
When concrete implementation, can detect above-mentioned temperature value and relative humidity value through temperature sensor and humidity transducer, temperature sensor and humidity transducer set up in the inside of converter casing, can be connected with the main control board of converter through wireless connection or signal transmission line to transmit the temperature value and the relative humidity value that detect to the main control board.
And the main control board 20 is used for controlling the electrifying states of the charging resistor and the discharging resistor in the converter according to the temperature value and the relative humidity value.
The main control board 20 receives the temperature value and the relative humidity value transmitted by the temperature sensor and the humidity sensor, performs operation, controls the power-on states of the charging resistor and the discharging resistor inside the converter according to the comparison result of the temperature value and the humidity threshold value stored in advance and the comparison result of the relative humidity value and the humidity threshold value stored in advance, and can improve the temperature inside the frequency converter shell and reduce the relative humidity inside the frequency converter shell by the power-on heating of the charging resistor and the discharging resistor.
The atmospheric control device of converter of this embodiment, through main control board 20 according to temperature value and relative humidity value control converter inside resistance to charge and discharge resistance's the on-state, when the operating condition of converter is unsatisfied to the temperature and the relative humidity of converter, the control converter self inside resistance to charge and discharge resistance's circular telegram is exothermic, the temperature is raised, reduce relative humidity simultaneously, need not to set up in addition the heating unit, can realize on the basis that does not increase the inside hardware architecture of converter, control converter casing inside temperature and relative humidity, the cost is reduced.
Example 5
In this embodiment, another temperature and humidity control device for an inverter is provided, fig. 4 is a block diagram of a temperature and humidity control device for an inverter according to another embodiment of the present invention, and in order to accurately control the temperature and the relative humidity inside a casing of an inverter, as shown in fig. 4, the main control board 20 specifically includes: a determining unit 201, configured to determine whether the temperature value is greater than or equal to a first threshold and the relative humidity value is less than or equal to a second threshold; the first control unit 202 is configured to control the charging resistor and the discharging resistor not to be powered on to directly control the frequency converter to start operating when the temperature value is greater than or equal to the first threshold and the relative humidity value is less than or equal to the second threshold, and if the temperature value is greater than or equal to the first threshold and the relative humidity value is less than or equal to the second threshold, it indicates that the current temperature and the current relative humidity inside the casing of the frequency converter meet the operating conditions of the frequency converter, and at this time, the charging resistor and the discharging resistor are controlled not to be powered on to directly control the frequency converter to start operating. After the frequency converter starts to operate, the charging resistor and the discharging resistor are controlled to be powered on or powered off according to control logic inherent in the frequency converter.
A second control unit 203, configured to control the charging resistor and the discharging resistor in the frequency converter to be powered on when the temperature value is greater than or equal to a first threshold and the rh value is less than or equal to a second threshold, and if the temperature value is greater than or equal to the first threshold and the rh value is less than or equal to the second threshold, it indicates that the current temperature and the current rh inside the casing of the frequency converter do not satisfy the operating condition of the frequency converter, and at this time, the charging resistor and the discharging resistor in the frequency converter are controlled to be powered on; the temperature in the shell of the frequency converter is improved and the relative humidity is reduced by electrifying the charging resistor and the discharging resistor to release heat.
After controlling the charging resistor and the discharging resistor in the frequency converter to be powered on, the obtaining module 10 continues to monitor the temperature value and the relative humidity value inside the shell of the frequency converter until the temperature value is greater than or equal to the first threshold value and the relative humidity value is less than or equal to the second threshold value, the first control unit 202 controls the charging resistor to be short-circuited, controls the discharging resistor to be powered off, and then controls the frequency converter to start to operate. The first control unit 202 is specifically configured to: controlling the contactor to be closed to enable the charging resistor to be in short circuit; wherein, the contactor is connected in parallel with the charging resistor. The first control unit 202 is further specifically configured to control the discharge resistor to be powered off by controlling the switch connected in series with the discharge resistor to be turned off.
In order to increase the air flow speed inside the inverter housing, a fan may be further disposed inside the inverter housing, and therefore, the main control board 20 further includes a third control unit 204, which is used for controlling the fan inside the inverter housing to be turned on while controlling the charging resistor and the discharging resistor inside the inverter to be powered on, so as to increase the air flow speed inside the inverter housing and make the inside of the inverter housing be heated uniformly.
If the frequency converter is not used for a long time, the electrolytic capacitor may leak electricity, so that the bus voltage cannot be quickly charged to a target value, at this time, the frequency converter is started in a short time, and cannot normally work, so that the temperature and the relative humidity in the shell of the non-optical frequency converter need to meet the operating conditions, the power waiting time of the frequency converter cannot be too long, and if the power waiting time of the frequency converter is long, the frequency converter can be started only after being charged for a long time, therefore, the main control board further comprises a timing unit 205, which is used for acquiring the power waiting time of the frequency converter before judging whether the temperature value is greater than or equal to a first threshold value and the relative humidity value is less than or equal to a second threshold value; the power waiting time is the accumulated time of the frequency converter in an unused state; and a fourth control unit 206, configured to control a charging duration of the dc bus capacitor inside the converter according to the above standby duration. The fourth control unit 206 is specifically configured to: judging whether the power waiting time is less than a first preset time; if yes, controlling the direct current bus capacitor to charge for a second preset time, and then triggering the judgment unit 201 to judge whether the temperature value is greater than or equal to the first threshold and the relative humidity value is less than or equal to the second threshold; if not, the charging of the dc bus capacitor is controlled for a third preset time, and then the determining unit 201 is triggered to execute the step of determining whether the temperature value is greater than or equal to the first threshold and the relative humidity value is less than or equal to the second threshold, wherein the third preset time period is longer than the second preset time period, for example, the second preset time period may be set to 5s, and the third preset time period may be set to 30min, that is, no matter whether the waiting time period is longer than the first preset time period, the dc bus capacitor will be charged, and the charging is normally performed for about 5s, but the electrolyte devices such as electrolytic capacitors and the like have the problems of electrolyte leakage, capacitor bulge and the like caused by long-time non-use, the problems that a three-phase rectifying circuit is difficult to charge to more than 450V and a large leakage current occurs when a capacitor is suddenly increased in voltage can be solved by charging an electrolytic capacitor which is not used for a long time. In this embodiment, the first preset time period may be obtained through an experimental test, for example, the first preset time period may be set to 180 days, and the second preset time period may be set according to a characteristic of a dc bus capacitor in the frequency converter, so that the dc bus capacitor can be fully charged after the second preset time period is satisfied.
Example 6
In this embodiment, a frequency converter is provided, and fig. 5 is a schematic structural diagram of the frequency converter according to the embodiment of the present invention, as shown in fig. 5, the frequency converter includes: the device comprises a shell 1, a direct current bus capacitor 2, an inverter circuit 3, a rectifying circuit 4, a reactor 5, a charging resistor 6, a discharging resistor 7, a contactor 8, a fan 9 and an acquisition module 10, wherein the direct current bus capacitor 2, the inverter circuit 3, the rectifying circuit 4, the reactor 5, the charging resistor 6, the discharging resistor 7, the contactor 8, the fan 9 and the acquisition module 10 are all arranged inside the shell 1.
Fig. 6 is an internal circuit diagram of the frequency converter according to the embodiment of the present invention, as shown in fig. 6, two dc buses are connected between the inverter circuit 3 and the rectifier circuit 4, a first end of the dc bus capacitor 2 is connected to a first line of the dc bus, a second end of the dc bus capacitor is connected to a second line of the dc bus, the discharging resistor 7 is connected in series with the fan 9 and then connected in parallel to both ends of the dc bus capacitor 2, the dc bus connected to the first end of the dc bus capacitor 2 is provided with the charging resistor 6 and the reactor 5 in series, and the contactor 8 is connected in parallel to the charging resistor 6.
Example 7
The embodiment provides an air conditioning unit, which comprises the frequency converter in the embodiment.
The above-described embodiments of the apparatus are merely illustrative, wherein the modules described as separate parts may or may not be physically separate, and the parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention 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; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (12)
1. A temperature and humidity control method of a frequency converter is characterized by comprising the following steps:
after a frequency converter is powered on, acquiring a temperature value and a relative humidity value inside a shell of the frequency converter;
and controlling the electrifying states of the charging resistor and the discharging resistor in the converter according to the temperature value and the relative humidity value.
2. The method of claim 1, wherein controlling the energization state of the charging resistor and the discharging resistor inside the converter according to the temperature value and the relative humidity value comprises:
judging whether the temperature value is greater than or equal to a first threshold value and the relative humidity value is less than or equal to a second threshold value;
if yes, controlling the charging resistor and the discharging resistor not to be electrified, and directly controlling the frequency converter to start to operate.
3. The method of claim 2, wherein after determining whether the temperature value is greater than or equal to a first threshold and the relative humidity value is less than or equal to a second threshold, the method further comprises:
if not, controlling a charging resistor and a discharging resistor in the frequency converter to be electrified;
and monitoring the temperature value and the relative humidity value until the temperature value is greater than or equal to a first threshold value, and controlling the charging resistor to be in short circuit, controlling the discharging resistor to be powered off and then controlling the frequency converter to start to operate after the relative humidity value is less than or equal to a second threshold value.
4. The method of claim 3, wherein controlling the charging resistance short circuit comprises:
controlling the contactor to be closed to enable the charging resistor to be in short circuit; wherein the contactor is arranged in parallel with the charging resistor.
5. The method of claim 3, wherein while controlling energization of a charging resistor and a discharging resistor within the frequency converter, the method further comprises:
and controlling a fan inside the frequency converter shell to be started.
6. The method of claim 2, wherein before determining whether the temperature value is greater than or equal to a first threshold and the relative humidity value is less than or equal to a second threshold, the method further comprises:
acquiring the power waiting time of the frequency converter; the power waiting time is the accumulated time of the frequency converter in an unused state;
and controlling the charging time of the direct current bus capacitor in the converter according to the waiting time.
7. The method of claim 6, wherein controlling a charging period of a DC bus capacitor within the converter based on the standby period comprises:
judging whether the power waiting time is less than a first preset time;
if yes, controlling the direct current bus capacitor to be charged for a second preset time, and then triggering and judging whether the temperature value is greater than or equal to a first threshold value and the relative humidity value is smaller than or equal to a second threshold value;
if not, controlling the direct current bus capacitor to be charged for a third preset time, and then triggering and judging whether the temperature value is greater than or equal to a first threshold value and the relative humidity value is less than or equal to a second threshold value;
and the third preset time length is greater than the second preset time length.
8. The temperature and humidity control device of the frequency converter is characterized by comprising:
the acquisition module is used for acquiring a temperature value and a relative humidity value inside the shell of the frequency converter after the frequency converter is powered on;
and the main control board is used for controlling the electrifying states of the charging resistor and the discharging resistor in the converter according to the temperature value and the relative humidity value.
9. A frequency converter comprising a housing, a charging resistor and a discharging resistor, characterized in that the frequency converter further comprises the apparatus of claim 8.
10. The frequency converter of claim 9, further comprising:
and the fan is arranged inside the frequency converter shell.
11. Air conditioning assembly, characterized in that it comprises an inverter according to claim 9 or 10.
12. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 1 to 7.
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