CN112564051B - Overheat protection control method, overheat protection control device, overheat protection control circuit, motor controller and household appliance - Google Patents

Overheat protection control method, overheat protection control device, overheat protection control circuit, motor controller and household appliance Download PDF

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Publication number
CN112564051B
CN112564051B CN202011381162.6A CN202011381162A CN112564051B CN 112564051 B CN112564051 B CN 112564051B CN 202011381162 A CN202011381162 A CN 202011381162A CN 112564051 B CN112564051 B CN 112564051B
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China
Prior art keywords
electrolytic capacitor
temperature
body temperature
preset
overheat protection
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CN112564051A (en
Inventor
黄粤
霍军亚
王明明
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GD Midea Air Conditioning Equipment Co Ltd
Foshan Shunde Midea Electric Science and Technology Co Ltd
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GD Midea Air Conditioning Equipment Co Ltd
Foshan Shunde Midea Electric Science and Technology Co Ltd
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Priority to CN202011381162.6A priority Critical patent/CN112564051B/en
Publication of CN112564051A publication Critical patent/CN112564051A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/16—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for capacitors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
    • H02P29/028—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the motor continuing operation despite the fault condition, e.g. eliminating, compensating for or remedying the fault
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/02—Providing protection against overload without automatic interruption of supply
    • H02P29/032—Preventing damage to the motor, e.g. setting individual current limits for different drive conditions
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
    • H02P29/60—Controlling or determining the temperature of the motor or of the drive

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses an overheat protection control method and device for an electrolytic capacitor in household electrical equipment, a circuit, a motor controller and the household electrical equipment, wherein the overheat protection control method for the electrolytic capacitor in the household electrical equipment comprises the following steps: acquiring the body temperature of the electrolytic capacitor; when the body temperature of the electrolytic capacitor is smaller than or equal to a first preset temperature, determining a temperature interval in which the body temperature of the electrolytic capacitor is located; and controlling the operation frequency of the compressor at the rear end of the electrolytic capacitor in a sectional manner according to the temperature range of the body temperature of the electrolytic capacitor. According to the overheat protection control method for the electrolytic capacitor in the household electrical appliance, the body temperature of the electrolytic capacitor is effectively prevented from being too high, a good overheat protection effect is achieved, the service life of devices such as the electrolytic capacitor is prolonged, the maintenance frequency and the maintenance cost of the household electrical appliance are reduced, and the normal working and refrigeration effects of the household electrical appliance are guaranteed.

Description

Overheat protection control method, overheat protection control device, overheat protection control circuit, motor controller and household appliance
Technical Field
The present invention relates to the technical field of home appliances, and more particularly, to a method for controlling overheat protection of an electrolytic capacitor in a home appliance, a computer readable storage medium, a motor controller, a device for controlling overheat protection of an electrolytic capacitor in a home appliance, a circuit for controlling overheat protection of an electrolytic capacitor in a home appliance, and a home appliance.
Background
In the related art, the failure of the strong-current filter electrolytic capacitor is mainly overheat failure, the electrolytic capacitor fails to operate, other devices of the electric control board are damaged together, the whole electric control board needs to be replaced, and the maintenance cost is high.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides an overheat protection control method for an electrolytic capacitor in a household appliance, which effectively avoids the overhigh temperature of a body of the electrolytic capacitor and achieves a good overheat protection effect.
The invention also proposes a computer readable storage medium.
The invention also provides a motor controller capable of realizing the overheat protection control method.
The invention also provides an overheat protection control device of the electrolytic capacitor in the household electrical appliance.
The invention also provides an overheat protection control circuit of the electrolytic capacitor in the household appliance.
The invention also provides household electrical equipment comprising the overheat protection control circuit.
In order to achieve the above objective, an embodiment of the present invention provides a overheat protection control method for an electrolytic capacitor in a home appliance, including: acquiring the body temperature of the electrolytic capacitor; when the body temperature of the electrolytic capacitor is smaller than or equal to a first preset temperature, determining a temperature interval in which the body temperature of the electrolytic capacitor is located; and controlling the operation frequency of the compressor at the rear end of the electrolytic capacitor in a sectional manner according to the temperature range of the body temperature of the electrolytic capacitor.
According to the overheat protection control method for the electrolytic capacitor in the household electrical appliance, when the body temperature of the electrolytic capacitor is smaller than or equal to the first preset temperature, the operation frequency of the compressor at the rear end of the electrolytic capacitor is controlled in a segmented mode according to the temperature interval where the electrolytic capacitor is located, the body temperature of the electrolytic capacitor is effectively prevented from being too high, a good overheat protection effect is achieved, the service life of devices such as the electrolytic capacitor is prolonged, the maintenance frequency and the maintenance cost of the household electrical appliance are reduced, and the normal operation and the refrigeration effect of the household electrical appliance are guaranteed.
In addition, the overheat protection control method for the electrolytic capacitor in the home appliance according to the embodiment of the present invention may further have the following additional technical features:
according to some embodiments of the present invention, the step of controlling the operation frequency of the compressor at the rear end of the electrolytic capacitor in a segment manner according to the temperature range where the body temperature of the electrolytic capacitor is located includes: when the body temperature of the electrolytic capacitor is smaller than or equal to a second preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to operate at a first preset frequency; when the body temperature of the electrolytic capacitor is larger than the second preset temperature and smaller than or equal to the third preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to perform frequency reduction operation according to a first reduction rate; when the body temperature of the electrolytic capacitor is larger than a third preset temperature and smaller than or equal to a fourth preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to operate at a second preset frequency, wherein the first preset frequency is larger than the second preset frequency; when the body temperature of the electrolytic capacitor is larger than the fourth preset temperature and smaller than or equal to the first preset temperature, controlling the compressor at the rear end of the electrolytic capacitor to perform frequency reduction operation according to the second descending rate.
According to some embodiments of the invention, when the body temperature of the electrolytic capacitor is greater than a first preset temperature, the compressor at the rear end of the electrolytic capacitor is also controlled to stop.
According to some embodiments of the invention, obtaining a bulk temperature of an electrolytic capacitor includes: obtaining a maximum voltage value and a minimum voltage value of two ends of the electrolytic capacitor in a period time, and calculating a voltage difference value of the two ends of the electrolytic capacitor according to the maximum voltage value and the minimum voltage value; and calculating the body temperature of the electrolytic capacitor according to the voltage difference value.
According to some embodiments of the invention, the bulk temperature of the electrolytic capacitor is calculated according to the following formula: Δu=k×t+a, where Δu is the voltage difference, k is a preset coefficient, T is the body temperature of the electrolytic capacitor, and a is a preset compensation value.
According to some embodiments of the invention, the temperature of the electrolytic capacitor is detected by a temperature sensor to obtain the body temperature of the electrolytic capacitor.
According to some embodiments of the invention, the temperature sensor is an NTC thermistor or thermocouple.
To achieve the above objective, an embodiment of the present invention provides a computer readable storage medium, on which an overheat protection control program of an electrolytic capacitor in a home appliance is stored, where the overheat protection control program of the electrolytic capacitor in the home appliance is executed by a processor to implement the overheat protection control method of the electrolytic capacitor in the home appliance according to the embodiment of the present invention.
In order to achieve the above objective, an embodiment of the present invention provides a motor controller, including a memory, a processor, and a overheat protection control program for an electrolytic capacitor in a home appliance device stored in the memory and capable of running on the processor, where the overheat protection control program is executed by the processor, to implement the overheat protection control method for an electrolytic capacitor in a home appliance device according to the embodiment of the present invention.
To achieve the above objective, an embodiment of the present invention provides an overheat protection control device for an electrolytic capacitor in a home appliance, including: the temperature acquisition module is used for acquiring the body temperature of the electrolytic capacitor; the determining module is used for determining a temperature interval in which the body temperature of the electrolytic capacitor is located when the body temperature of the electrolytic capacitor is smaller than or equal to a first preset temperature; and the overheat protection control module is used for controlling the operation frequency of the compressor at the rear end of the electrolytic capacitor in a sectional manner according to the temperature interval where the body temperature of the electrolytic capacitor is located.
According to the overheat protection control device for the electrolytic capacitor in the household appliance, when the body temperature of the electrolytic capacitor is smaller than or equal to the first preset temperature, the operation frequency of the compressor at the rear end of the electrolytic capacitor is controlled in a segmented mode according to the temperature interval where the electrolytic capacitor is located, the body temperature of the electrolytic capacitor is effectively prevented from being too high, a good overheat protection effect is achieved, the service life of devices such as the electrolytic capacitor is prolonged, the maintenance frequency and the maintenance cost of the household appliance are reduced, and the normal operation and the refrigeration effect of the household appliance are guaranteed.
In order to achieve the above object, an embodiment of the present invention provides an overheat protection control circuit for an electrolytic capacitor in a home appliance, which is characterized by comprising: the temperature detection unit is used for detecting the body temperature of the electrolytic capacitor; the control unit is connected with the temperature detection unit and is used for judging the body temperature of the electrolytic capacitor, determining a temperature interval where the body temperature of the electrolytic capacitor is located when the body temperature of the electrolytic capacitor is smaller than or equal to a first preset temperature, and controlling the operation frequency of the compressor at the rear end of the electrolytic capacitor in a sectional mode according to the temperature interval where the body temperature of the electrolytic capacitor is located.
According to the overheat protection control circuit of the electrolytic capacitor in the household appliance, when the body temperature of the electrolytic capacitor is smaller than or equal to the first preset temperature, the control unit is used for controlling the operation frequency of the compressor at the rear end of the electrolytic capacitor in a segmentation mode according to the temperature interval of the electrolytic capacitor, the body temperature of the electrolytic capacitor is effectively prevented from being too high, a good overheat protection effect is achieved, the service life of devices such as the electrolytic capacitor is prolonged, the maintenance frequency and the maintenance cost of the household appliance are reduced, and the normal operation and the refrigeration effect of the household appliance are guaranteed.
According to some embodiments of the invention, the control unit is further configured to control the compressor at the rear end of the electrolytic capacitor to operate at a first preset frequency when the body temperature of the electrolytic capacitor is less than or equal to a second preset temperature; when the body temperature of the electrolytic capacitor is larger than the second preset temperature and smaller than or equal to the third preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to perform frequency reduction operation according to a first reduction rate; when the body temperature of the electrolytic capacitor is larger than a third preset temperature and smaller than or equal to a fourth preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to operate at a second preset frequency, wherein the first preset frequency is larger than the second preset frequency; when the body temperature of the electrolytic capacitor is larger than the fourth preset temperature and smaller than or equal to the first preset temperature, controlling the compressor at the rear end of the electrolytic capacitor to perform frequency reduction operation according to the second descending rate.
According to some embodiments of the invention, the control unit is further configured to control a compressor at the rear end of the electrolytic capacitor to stop when the body temperature of the electrolytic capacitor is greater than a first preset temperature.
According to some embodiments of the invention, the temperature detecting unit includes a voltage detecting unit, where the voltage detecting unit is connected to the control unit, and the voltage detecting unit is configured to detect voltages across the electrolytic capacitor, where the control unit is further configured to calculate a voltage difference between a maximum voltage value and a minimum voltage value across the electrolytic capacitor within a period time according to the voltages across the electrolytic capacitor, and calculate a body temperature of the electrolytic capacitor according to the voltage difference.
According to some embodiments of the invention, the control unit calculates the bulk temperature of the electrolytic capacitor according to the following formula: Δu=k×t+a, where Δu is the voltage difference, k is a preset coefficient, T is the body temperature of the electrolytic capacitor, and a is a preset compensation value.
According to some embodiments of the invention, the temperature detection unit comprises: the temperature sensor is arranged corresponding to the electrolytic capacitor, and one end of the temperature sensor is connected with a preset power supply; one end of the first resistor is connected with the other end of the temperature sensor and is provided with a first node, and the other end of the first resistor is connected with the temperature sampling end of the control unit; one end of the second resistor is connected with the first node, and the other end of the second resistor is grounded; the positive terminal of the first voltage stabilizing capacitor is connected with the first node, and the other end of the first voltage stabilizing capacitor is grounded; and one end of the first capacitor is connected with the other end of the first resistor, and the other end of the first capacitor is grounded.
According to some embodiments of the invention, the temperature sensor is an NTC thermistor disposed below the body of the electrolytic capacitor.
According to some embodiments of the invention, the temperature sensor is a thermocouple, the thermocouple being disposed inside the body of the electrolytic capacitor.
In order to achieve the above objective, an embodiment of the present invention provides a home appliance, which includes an overheat protection control circuit of an electrolytic capacitor in the home appliance according to the embodiment of the present invention.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of an overheat protection control method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of voltage versus time of an electrolytic capacitor according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a method of acquiring a bulk temperature of an electrolytic capacitor according to some embodiments of the invention;
FIG. 4 is a schematic diagram of an overheat protection control circuit according to some embodiments of the present invention;
FIG. 5 is a schematic diagram of the cooperation of a temperature sensor and an electrolytic capacitor according to one embodiment of the present invention;
FIG. 6 is a schematic diagram of the cooperation of a temperature sensor and an electrolytic capacitor according to another embodiment of the present invention;
FIG. 7 is a schematic diagram of a method of overheat protection control in accordance with some embodiments of the present invention for reducing compressor operating frequency in stages;
fig. 8 is a schematic view of an overheat protection control device according to an embodiment of the present invention.
Description of the drawings:
an electrolytic capacitor 100;
an overheat protection control device 10; a temperature acquisition module 11; a determination module 12; an overheat protection control module 13;
an overheat protection control circuit 20;
a temperature detection unit 30; a temperature sensor 31; a first resistor 32; a second resistor 33; a first voltage stabilizing capacitor 34; a first capacitor 35;
a control unit 40.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The electrolytic capacitor (such as a strong-current filtering high-capacity electrolytic capacitor) in the household appliance can store energy, so that the direct-current voltage after the rectifying circuit is out becomes stable. However, in the working process, the electrolytic capacitor in the related art is easy to fail due to overheating, so that the whole machine cannot operate, and other devices of the electric control board are usually damaged together, so that the whole electric control board needs to be replaced, and the maintenance cost is high.
Therefore, the invention provides an overheat protection control method of an electrolytic capacitor in a household appliance, an overheat protection control device of the electrolytic capacitor in the household appliance and an overheat protection control circuit of the electrolytic capacitor in the household appliance, so as to overheat protect the electrolytic capacitor, prevent the temperature of the electrolytic capacitor from rising due to self or external factors, timely protect the electrolytic capacitor, improve the service life and reliability of the electrolytic capacitor, further improve the service life of the household appliance and reduce the maintenance cost. The home appliance may be an air conditioner external unit or the like.
An overheat protection control method of an electrolytic capacitor in a home appliance according to an embodiment of the present invention is described below with reference to the accompanying drawings.
As shown in FIG. 1, the overheat protection control method for the electrolytic capacitor in the household electrical appliance according to the embodiment of the invention comprises S1-S3.
S1: and acquiring the body temperature of the electrolytic capacitor.
In the embodiment of the present invention, the method of obtaining the bulk temperature of the electrolytic capacitor may include various methods.
In some embodiments of the invention, the body temperature of the electrolytic capacitor may be detected from a voltage change of the electrolytic capacitor. As shown in fig. 2 and 3, the voltage across the electrolytic capacitor periodically changes with time, and the body temperature of the electrolytic capacitor can be obtained according to the maximum voltage value (denoted as Umax) and the minimum voltage value (denoted as Umin) across the electrolytic capacitor, specifically including S11 and S12:
S11: obtaining a maximum voltage value and a minimum voltage value at two ends of the electrolytic capacitor in one cycle time, and calculating a voltage difference value (recorded as delta U, delta U=Umax-Umin) at two ends of the electrolytic capacitor according to the maximum voltage value and the minimum voltage value;
s12: and calculating the body temperature of the electrolytic capacitor according to the voltage difference.
In some embodiments, the bulk temperature of the electrolytic capacitor may be calculated according to the following equation:
ΔU=k*T+A
wherein DeltaU is the voltage difference, k is a preset coefficient, T is the body temperature of the electrolytic capacitor, and A is a preset compensation value.
According to the formula, after the maximum voltage value and the minimum voltage value at two ends of the electrolytic capacitor are determined, the body temperature of the electrolytic capacitor can be uniquely determined, and the temperature detection is simpler and more accurate. The frequency change of the operation of the whole machine is controlled by feedback through the change of the solved T value, so that the change of ripple waves of the electrolytic capacitor is controlled within a reliable range, the body temperature of the electrolytic capacitor is controlled within a safe operation range, and the overheat failure of the electrolytic capacitor is prevented.
In other embodiments of the present invention, as shown in fig. 4, the temperature of the electrolytic capacitor may be detected by a temperature sensor to obtain the body temperature of the electrolytic capacitor.
For example, in some embodiments, as shown in fig. 5, the temperature sensor is an NTC thermistor. The NTC thermistor can be as small as 0.010 inches or a small diameter, which is very convenient to install. The resistance value of the NTC thermistor drops rapidly with increasing temperature, which may consist of two or three metal oxides, mixed in a fluid-like clay and calcined in a high temperature furnace to a dense sintered ceramic.
For example, as shown in fig. 4 and 5, the voltage signal of the corresponding temperature is determined by utilizing the characteristic that the resistance value of the NTC thermistor rapidly decreases with the temperature rise at a certain measurement power, by the change of the resistance value thereof, and the voltage dividing circuit formed by the second resistor. The voltage signal is stabilized by the first voltage stabilizing capacitor, and is filtered by the first resistor and the delay of the first capacitor, so that a very clean electric signal is obtained and is input into the control unit (MCU processor). The control unit converts the electric signal to operate so as to achieve the purposes of detecting and controlling the temperature.
For another example, in some embodiments, as shown in fig. 4 and 6, the temperature sensor is a thermocouple. The thermocouple can directly measure the temperature of the electrolytic circuit, obtain the body temperature of the electrolytic capacitor to be measured, and convert the temperature signal into a thermal voltage signal. The voltage signal is stabilized through the first voltage stabilizing capacitor, and is subjected to delay filtering through the first resistor and the first capacitor, so that a very clean electric signal is obtained and is input into the control unit. The control unit converts the electric signal to operate so as to achieve the purposes of detecting and controlling the temperature.
As shown in fig. 1, S2: when the body temperature of the electrolytic capacitor is smaller than or equal to a first preset temperature, determining a temperature interval in which the body temperature of the electrolytic capacitor is located;
s3: and controlling the operation frequency of the compressor at the rear end of the electrolytic capacitor in a sectional manner according to the temperature range of the body temperature of the electrolytic capacitor.
When the body temperature of the electrolytic capacitor is smaller than or equal to a first preset temperature T1, the body temperature of the electrolytic capacitor does not reach a safety threshold value for danger such as explosion and fire, and the household appliance can work normally. When the household electrical appliance works normally, the body temperature of the electrolytic capacitor is related to the whole machine current due to the existence of ripple current, and the temperature of the electrolytic capacitor is reduced as the whole machine current is increased and the temperature of the electrolytic capacitor is reduced.
Therefore, when the body temperature of the electrolytic capacitor is less than or equal to the first preset temperature T1, as shown in fig. 7, if the temperature rises, the operating frequency of the compressor can be reduced by sections, so that the current of the whole machine is reduced, the body temperature of the electrolytic capacitor is prevented from rising to the first preset temperature, and the service life of the electrolytic capacitor and the whole machine is prolonged. And the compressor running frequency is reduced in a sectional way, but not continuously, so that the refrigeration effect is guaranteed. If the temperature is reduced, the operation frequency of the compressor can be increased by sections so as to obtain better refrigeration effect.
In one embodiment according to the present invention, as shown in fig. 7, the step S3 of controlling the operation frequency of the compressor at the rear end of the electrolytic capacitor in a segment manner according to the temperature range where the body temperature of the electrolytic capacitor is located may include steps S31 to S34, which are specifically as follows:
s31: when the body temperature of the electrolytic capacitor is less than or equal to a second preset temperature T2, controlling a compressor at the rear end of the electrolytic capacitor to operate at a first preset frequency F1. At this time, the body temperature of the electrolytic capacitor is lower, the first preset frequency F1 can be larger, the body temperature of the electrolytic capacitor cannot exceed the safety threshold, and the refrigerating effect of the household appliance can be guaranteed.
S32: when the body temperature of the electrolytic capacitor is larger than the second preset temperature T2 and smaller than or equal to the third preset temperature T3, controlling the compressor at the rear end of the electrolytic capacitor to perform frequency reduction operation according to the first reduction rate K1. The down-conversion operation of the compressor is controlled to reduce the operation current of the whole machine, so that the body temperature of the electrolytic capacitor is reduced, and the electrolytic capacitor is maintained in a safe temperature range.
S33: when the body temperature of the electrolytic capacitor is greater than the third preset temperature T3 and less than or equal to the fourth preset temperature T4, controlling the compressor at the rear end of the electrolytic capacitor to operate at the second preset frequency F2, wherein the first preset frequency F1 is greater than the second preset frequency F2. At this time, the body temperature of the electrolytic capacitor is increased but still does not exceed the safety threshold, so that the compressor is operated at a relatively smaller second preset frequency F2, thereby ensuring the working safety of the electrolytic capacitor and the refrigeration effect of the household appliance.
S34: when the body temperature of the electrolytic capacitor is larger than the fourth preset temperature T4 and smaller than or equal to the first preset temperature T1, controlling the compressor at the rear end of the electrolytic capacitor to perform frequency reduction operation according to the second descending rate K2. At this time, the body temperature of the electrolytic capacitor is higher and is close to the safety threshold, so that the running current of the whole machine is reduced by controlling the compressor to run in a down-conversion mode, and the body temperature of the electrolytic capacitor is reduced, so that the body temperature of the electrolytic capacitor is prevented from exceeding the first preset temperature T1.
Therefore, the operation frequency of the compressor is controlled in a sectional mode according to the temperature range of the body temperature of the electrolytic capacitor, so that the body temperature of the electrolytic capacitor is effectively prevented from being too high, a good overheat protection effect is achieved, and the normal operation and refrigeration effect of the household appliance are guaranteed.
According to some embodiments of the invention, when the body temperature of the electrolytic capacitor is higher than the first preset temperature, the compressor at the rear end of the electrolytic capacitor can be controlled to stop, and the risk of explosion and fire of the electrolytic capacitor is prevented by stopping protection, so that the use is safer.
According to the overheat protection control method for the electrolytic capacitor in the household electrical appliance, when the body temperature of the electrolytic capacitor is smaller than or equal to the first preset temperature, the operation frequency of the compressor at the rear end of the electrolytic capacitor is controlled in a segmented mode according to the temperature interval where the electrolytic capacitor is located, the body temperature of the electrolytic capacitor is effectively prevented from being too high, a good overheat protection effect is achieved, the service life of devices such as the electrolytic capacitor is prolonged, the maintenance frequency and the maintenance cost of the household electrical appliance are reduced, and the normal operation and the refrigeration effect of the household electrical appliance are guaranteed.
According to the computer readable storage medium of the embodiment of the invention, the overheat protection control program of the electrolytic capacitor in the household electrical appliance is stored on the computer readable storage medium, and when the overheat protection control program of the electrolytic capacitor in the household electrical appliance is executed by the processor, the overheat protection control method of the electrolytic capacitor in the household electrical appliance is realized.
The overheat protection control method for the electrolytic capacitor in the household electrical appliance has the beneficial technical effects, so that the overheat protection control method described in the embodiment is realized when the overheat protection control program stored in the computer readable storage medium is executed by the processor, the operation frequency of the compressor at the rear end of the electrolytic capacitor is controlled in a sectionalized mode according to the temperature interval where the electrolytic capacitor is positioned when the body temperature of the electrolytic capacitor is smaller than or equal to the first preset temperature, the body temperature of the electrolytic capacitor is effectively prevented from being too high, a good overheat protection effect is achieved, the service life of devices such as the electrolytic capacitor is prolonged, the maintenance frequency and the maintenance cost of the household electrical appliance are reduced, and the normal operation and the refrigeration effect of the household electrical appliance are ensured.
The motor controller according to the embodiment of the invention comprises a memory, a processor and an overheat protection control program of the electrolytic capacitor in the household electrical appliance which is stored in the memory and can run on the processor, and when the processor executes the overheat protection control program, the overheat protection control method of the electrolytic capacitor in the household electrical appliance is realized.
The overheat protection control method for the electrolytic capacitor in the household appliance has the beneficial technical effects, so that the motor controller according to the embodiment of the invention controls the operation frequency of the compressor at the rear end of the electrolytic capacitor in a sectionalized mode according to the temperature interval where the electrolytic capacitor is positioned when the body temperature of the electrolytic capacitor is smaller than or equal to the first preset temperature, effectively avoids the body temperature of the electrolytic capacitor from being too high, plays a good overheat protection effect, is beneficial to prolonging the service life of devices such as the electrolytic capacitor, reduces the maintenance frequency and the maintenance cost of the household appliance, and ensures the normal operation and refrigeration effect of the household appliance.
As shown in fig. 8, the overheat protection control device 10 of the electrolytic capacitor 100 in the home appliance according to the embodiment of the present invention includes: a temperature acquisition module 11, a determination module 12 and an overheat protection control module 13. The temperature acquisition module 11 is configured to acquire a body temperature of the electrolytic capacitor 100. The determining module 12 is configured to determine a temperature interval in which the body temperature of the electrolytic capacitor 100 is located when the body temperature of the electrolytic capacitor 100 is less than or equal to a first preset temperature. The overheat protection control module 13 is used for controlling the operation frequency of the compressor at the rear end of the electrolytic capacitor 100 in a sectional manner according to the temperature range where the body temperature of the electrolytic capacitor 100 is located.
The method of acquiring the body temperature of the electrolytic capacitor 100 by the temperature acquiring module 11 and the method of controlling the operation frequency of the compressor at the rear end of the electrolytic capacitor 100 by the overheat protection control module 13 refer to the overheat protection control method of the electrolytic capacitor in the home appliance according to the embodiment of the present invention, and the whole content of the overheat protection control method of the electrolytic capacitor in the home appliance according to the embodiment of the present invention may be used for the overheat protection control device 10 of the electrolytic capacitor 100 in the home appliance according to the embodiment of the present invention, and the specific content and the beneficial effects thereof are not described herein.
According to the overheat protection control device 10 of the electrolytic capacitor 100 in the household electrical appliance, when the body temperature of the electrolytic capacitor 100 is smaller than or equal to the first preset temperature, the operation frequency of the compressor at the rear end of the electrolytic capacitor 100 is controlled in a segmented mode according to the temperature interval where the electrolytic capacitor 100 is located, the body temperature of the electrolytic capacitor 100 is effectively prevented from being too high, a good overheat protection effect is achieved, the service life of the electrolytic capacitor 100 and other devices is prolonged, the maintenance frequency and the maintenance cost of the household electrical appliance are reduced, and the normal operation and the refrigeration effect of the household electrical appliance are guaranteed.
The overheat protection control circuit 20 of the electrolytic capacitor 100 in the home appliance according to the embodiment of the present invention is described below with reference to the accompanying drawings.
As shown in fig. 4, the overheat protection control circuit 20 of the electrolytic capacitor 100 in the home appliance according to the embodiment of the present invention includes: a temperature detection unit 30 and a control unit 40.
Specifically, the temperature detection unit 30 is configured to detect the body temperature of the electrolytic capacitor 100. The control unit 40 is connected to the temperature detection unit 30, and the control unit 40 is configured to determine a body temperature of the electrolytic capacitor 100, determine a temperature interval in which the body temperature of the electrolytic capacitor 100 is located when the body temperature of the electrolytic capacitor 100 is less than or equal to a first preset temperature T1, and perform a sectional control on a compressor operating frequency at the rear end of the electrolytic capacitor 100 according to the temperature interval in which the body temperature of the electrolytic capacitor 100 is located.
When the body temperature of the electrolytic capacitor 100 is less than or equal to the first preset temperature T1, it indicates that the body temperature of the electrolytic capacitor 100 does not reach the safety threshold for the risk of explosion, fire, etc., and the home appliance can work normally. When the household electrical appliance works normally, the body temperature of the electrolytic capacitor 100 is related to the whole machine current due to the existence of ripple current, and the larger the whole machine current is, the smaller the whole machine current is, and the temperature is reduced.
Therefore, when the body temperature of the electrolytic capacitor 100 is less than or equal to the first preset temperature T1, if the temperature rises, the compressor operating frequency can be reduced by sections, so that the overall machine current is reduced, the body temperature of the electrolytic capacitor 100 is prevented from rising to the first preset temperature, and the service lives of the electrolytic capacitor 100 and the overall machine are prolonged. And the compressor running frequency is reduced in a sectional way, but not continuously, so that the refrigeration effect is guaranteed. If the temperature is reduced, the operation frequency of the compressor can be increased by sections so as to obtain better refrigeration effect.
In one embodiment according to the present invention, as shown in fig. 7, the control unit 40 is further configured to control the compressor at the rear end of the electrolytic capacitor 100 to operate at the first preset frequency F1 when the body temperature of the electrolytic capacitor 100 is equal to or less than the second preset temperature T2. At this time, the body temperature of the electrolytic capacitor 100 is low, the first preset frequency F1 can be larger, which does not cause the body temperature of the electrolytic capacitor 100 to exceed the safety threshold, and can ensure the refrigeration effect of the home appliance.
As shown in fig. 7, the control unit 40 is further configured to control the compressor at the rear end of the electrolytic capacitor 100 to perform the down-conversion operation according to the first dropping rate K1 when the body temperature of the electrolytic capacitor 100 is greater than the second preset temperature T2 and less than or equal to the third preset temperature T3. The down-conversion operation of the compressor is controlled to reduce the operation current of the whole machine, thereby reducing the body temperature of the electrolytic capacitor 100 to maintain in a safe temperature range.
As shown in fig. 7, the control unit 40 is further configured to control the compressor at the rear end of the electrolytic capacitor 100 to operate at a second preset frequency F2 when the body temperature of the electrolytic capacitor 100 is greater than the third preset temperature T3 and less than or equal to the fourth preset temperature T4, wherein the first preset frequency F1 is greater than the second preset frequency F2. At this time, the body temperature of the electrolytic capacitor 100 is increased but still does not exceed the safety threshold, so that the compressor is operated at the second preset frequency F2, which is relatively small, so as to ensure the refrigeration effect of the home appliance while ensuring the working safety of the electrolytic capacitor 100.
As shown in fig. 7, the control unit 40 is further configured to control the compressor at the rear end of the electrolytic capacitor 100 to perform the down-conversion operation according to the second dropping rate K2 when the body temperature of the electrolytic capacitor 100 is greater than the fourth preset temperature T4 and less than or equal to the first preset temperature T1. At this time, the body temperature of the electrolytic capacitor 100 is higher and approaches the safety threshold, so the operation current of the whole machine is reduced by controlling the down-conversion operation of the compressor, thereby reducing the body temperature of the electrolytic capacitor 100, and avoiding that the body temperature of the electrolytic capacitor 100 exceeds the first preset temperature T1.
Therefore, the operation frequency of the compressor is controlled in a sectional mode according to the temperature range of the body temperature of the electrolytic capacitor 100, so that the body temperature of the electrolytic capacitor 100 is effectively prevented from being too high, a good overheat protection effect is achieved, and the normal operation and refrigeration effect of the household appliance are guaranteed.
According to some embodiments of the present invention, the control unit 40 is further configured to control the compressor at the rear end of the electrolytic capacitor 100 to stop when the body temperature of the electrolytic capacitor 100 is greater than the first preset temperature T1, and the use is safer by stopping the protection to prevent the risk of explosion and fire of the electrolytic capacitor 100.
In the embodiment of the present invention, the method of obtaining the bulk temperature of the electrolytic capacitor 100 may include various methods.
In some embodiments of the present invention, as shown in fig. 4, the temperature detection unit 30 includes: a temperature sensor 31, a first resistor 32, a second resistor 33, a first stabilizing capacitor 34 and a first capacitor 35.
The temperature sensor 31 is disposed corresponding to the electrolytic capacitor 100, and one end of the temperature sensor 31 is connected to a preset power source to detect the body temperature of the electrolytic capacitor 100. One end of the first resistor 32 is connected to the other end of the temperature sensor 31 and has a first node, and the other end of the first resistor 32 is connected to a temperature sampling end of the control unit 40. One end of the second resistor 33 is connected to the first node, and the other end of the second resistor 33 is grounded. The positive terminal of the first voltage stabilizing capacitor 34 is connected to the first node, and the other terminal of the first voltage stabilizing capacitor 34 is grounded. One end of the first capacitor 35 is connected to the other end of the first resistor 32, and the other end of the first capacitor 35 is grounded. The second resistor 33 can form a voltage divider circuit with the temperature sensor 31 to determine a voltage signal of the corresponding temperature. The first resistor 32 and the first capacitor 35 can play a role of delay filtering, and the first voltage stabilizing capacitor 34 plays a role of stabilizing signals so as to obtain very clean electric signals, and the very clean electric signals are input into the control unit 40, so that the control unit 40 can perform conversion operation on the electric signals, and the purposes of detecting and controlling the temperature are achieved.
For example, in some embodiments, as shown in fig. 5, the temperature sensor 31 is an NTC thermistor (negative temperature coefficient). The NTC thermistor can be as small as 0.010 inches or a small diameter, which is very convenient to install. Alternatively, the NTC thermistor may be pre-buried in the body of the electrolytic capacitor 100 or disposed below the body of the electrolytic capacitor 100, for example, the NTC thermistor may be a patch-packaged thermistor, which may all implement temperature detection, and is convenient to install, so as to avoid interference of other devices. The resistance value of the NTC thermistor drops rapidly with increasing temperature, which may consist of two or three metal oxides, mixed in a fluid-like clay and calcined in a high temperature furnace to a dense sintered ceramic.
For example, as shown in fig. 4 and 5, the voltage signal of the corresponding temperature is determined by utilizing the characteristic that the resistance value of the NTC thermistor rapidly decreases with the temperature rise at a certain measurement power, by the variation of the resistance value thereof, and the second resistor 33 constituting a voltage dividing circuit. The voltage signal is stabilized by the first voltage stabilizing capacitor 34 and is time-delay filtered by the first resistor 32 and the first capacitor 35, so that a very clean electric signal is obtained and is input into the control unit 40. The control unit 40 performs conversion operation on the electric signal to achieve the purpose of detecting and controlling the temperature.
For another example, in some embodiments, as shown in fig. 4 and 6, the temperature sensor 31 is a thermocouple. The thermocouple can directly measure the temperature of the electrolytic circuit, obtain the body temperature of the electrolytic capacitor 100 to be measured, and convert the temperature signal into a thermal voltage signal. The voltage signal is stabilized by the first voltage stabilizing capacitor 34, and is filtered by the first resistor 32 and the first capacitor 35 in a time delay manner, so that a very clean electric signal is obtained and is input into the control unit 40 (MCU processor). The control unit 40 performs conversion operation on the electric signal to achieve the purpose of detecting and controlling the temperature. Optionally, the thermocouple may be disposed inside the body of the electrolytic capacitor 100 or be a patch-packaged thermocouple and disposed on the surface of the body of the electrolytic capacitor 100, which can achieve temperature detection, and is convenient to install, so as to avoid interference of other devices.
In some embodiments of the present invention, the body temperature of the electrolytic capacitor 100 may be detected based on the voltage variation of the electrolytic capacitor 100. As shown in fig. 2 and 3, the voltages across the electrolytic capacitor 100 periodically vary with time, and the bulk temperature of the electrolytic capacitor 100 can be obtained from the maximum voltage value (denoted as Umax) and the minimum voltage value (denoted as Umin) across the electrolytic capacitor 100.
Specifically, the temperature detecting unit 30 includes a voltage detecting unit, which is connected to the control unit 40, and is configured to detect voltages across the electrolytic capacitor 100, wherein the control unit 40 is further configured to calculate a voltage difference (Δu, Δu=umax-Umin) between a maximum voltage value and a minimum voltage value across the electrolytic capacitor 100 within a period of time according to the voltages across the electrolytic capacitor 100, and calculate a body temperature of the electrolytic capacitor 100 according to the voltage difference.
In some embodiments, the control unit 40 calculates the bulk temperature of the electrolytic capacitor 100 according to the following formula:
ΔU=k*T+A
wherein Δu is a voltage difference, k is a preset coefficient, T is a body temperature of the electrolytic capacitor 100, and a is a preset compensation value.
According to the above formula, after the maximum voltage value and the minimum voltage value at two ends of the electrolytic capacitor 100 are determined, the body temperature of the electrolytic capacitor 100 can be uniquely determined, and the temperature detection is simpler and more accurate. The frequency change of the whole machine operation is controlled through the solved change of the T value in a feedback way, so that the change of ripple waves of the electrolytic capacitor 100 is controlled within a reliable range, the body temperature of the electrolytic capacitor 100 is controlled within a safe operation range, and the electrolytic capacitor 100 is prevented from overheat failure.
According to the overheat protection control circuit 20 of the electrolytic capacitor 100 in the household electrical appliance provided by the embodiment of the invention, when the body temperature of the electrolytic capacitor 100 is smaller than or equal to the first preset temperature, the control unit 40 is used for controlling the operation frequency of the compressor at the rear end of the electrolytic capacitor 100 in a segmentation way according to the temperature interval where the electrolytic capacitor 100 is positioned, so that the body temperature of the electrolytic capacitor 100 is effectively prevented from being too high, a good overheat protection effect is achieved, the service life of the electrolytic capacitor 100 and other devices is prolonged, the maintenance frequency and the maintenance cost of the household electrical appliance are reduced, and the normal operation and refrigeration effect of the household electrical appliance are ensured.
The home appliance according to the embodiment of the present invention includes the overheat protection control circuit 20 of the electrolytic capacitor 100 in the home appliance according to the embodiment of the present invention. Because the overheat protection control circuit 20 of the electrolytic capacitor 100 in the home appliance according to the embodiment of the present invention has the beneficial technical effects described above, when the body temperature of the electrolytic capacitor 100 is less than or equal to the first preset temperature, the home appliance according to the embodiment of the present invention performs the sectional control on the operation frequency of the compressor at the rear end of the electrolytic capacitor 100 according to the temperature interval where the electrolytic capacitor 100 is located through the control unit 40, so that the body temperature of the electrolytic capacitor 100 is effectively prevented from being too high, a good overheat protection effect is achieved, the service life of the devices such as the electrolytic capacitor 100 is advantageously improved, the maintenance frequency and the maintenance cost of the home appliance are reduced, and the normal operation and the refrigeration effect of the home appliance are ensured.
Other constructions and operations of the home appliance according to the embodiment of the present invention are known to those of ordinary skill in the art, and will not be described in detail herein.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a 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 at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and additional implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order from that shown or discussed, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.
The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

Claims (13)

1. An overheat protection control method for an electrolytic capacitor in a home appliance is characterized by comprising the following steps:
acquiring the body temperature of the electrolytic capacitor;
when the body temperature of the electrolytic capacitor is smaller than or equal to a first preset temperature, determining a temperature interval in which the body temperature of the electrolytic capacitor is located;
The operation frequency of the compressor at the rear end of the electrolytic capacitor is controlled in a sectional manner according to the temperature range of the body temperature of the electrolytic capacitor,
the method for controlling the operation frequency of the compressor at the rear end of the electrolytic capacitor in a sectionalized mode according to a temperature interval where the body temperature of the electrolytic capacitor is located comprises the following steps:
when the body temperature of the electrolytic capacitor is smaller than or equal to a second preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to operate at a first preset frequency;
when the body temperature of the electrolytic capacitor is larger than the second preset temperature and smaller than or equal to the third preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to perform frequency reduction operation according to a first reduction rate;
when the body temperature of the electrolytic capacitor is larger than a third preset temperature and smaller than or equal to a fourth preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to operate at a second preset frequency, wherein the first preset frequency is larger than the second preset frequency;
when the body temperature of the electrolytic capacitor is larger than a fourth preset temperature and smaller than or equal to a first preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to perform frequency reduction operation according to a second descending rate;
Wherein, obtain the body temperature of electrolytic capacitor, include:
obtaining a maximum voltage value and a minimum voltage value of two ends of the electrolytic capacitor in a period time, and calculating a voltage difference value of the two ends of the electrolytic capacitor according to the maximum voltage value and the minimum voltage value;
calculating the body temperature of the electrolytic capacitor according to the voltage difference value, and calculating the body temperature of the electrolytic capacitor according to the following formula:
Δu=k×t+a, where Δu is the voltage difference, k is a preset coefficient, T is the body temperature of the electrolytic capacitor, and a is a preset compensation value.
2. The overheat protection control method of an electrolytic capacitor in a home appliance of claim 1, wherein when the body temperature of the electrolytic capacitor is greater than a first preset temperature, the compressor at the rear end of the electrolytic capacitor is also controlled to stop.
3. The overheat protection control method of an electrolytic capacitor in a home appliance of claim 1, wherein the temperature of the electrolytic capacitor is detected by a temperature sensor to obtain the body temperature of the electrolytic capacitor.
4. A method of overheat protection control of electrolytic capacitors in home appliances as claimed in claim 3, wherein the temperature sensor is an NTC thermistor or thermocouple.
5. A computer-readable storage medium, on which an overheat protection control program of an electrolytic capacitor in an electric home appliance is stored, which overheat protection control program of an electrolytic capacitor in an electric home appliance, when executed by a processor, implements the overheat protection control method of an electrolytic capacitor in an electric home appliance as claimed in any one of claims 1 to 4.
6. A motor controller, comprising a memory, a processor, and an overheat protection control program for an electrolytic capacitor in a home appliance stored in the memory and operable on the processor, wherein the overheat protection control program, when executed by the processor, implements the overheat protection control method for an electrolytic capacitor in a home appliance as claimed in any one of claims 1 to 4.
7. An overheat protection control device for an electrolytic capacitor in a home appliance, comprising:
the temperature acquisition module is used for acquiring the body temperature of the electrolytic capacitor;
the determining module is used for determining a temperature interval in which the body temperature of the electrolytic capacitor is located when the body temperature of the electrolytic capacitor is smaller than or equal to a first preset temperature;
the overheat protection control module is used for controlling the operation frequency of the compressor at the rear end of the electrolytic capacitor in a sectional manner according to a temperature interval where the body temperature of the electrolytic capacitor is located; the method for controlling the operation frequency of the compressor at the rear end of the electrolytic capacitor in a sectionalized mode according to a temperature interval where the body temperature of the electrolytic capacitor is located comprises the following steps:
When the body temperature of the electrolytic capacitor is smaller than or equal to a second preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to operate at a first preset frequency;
when the body temperature of the electrolytic capacitor is larger than the second preset temperature and smaller than or equal to the third preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to perform frequency reduction operation according to a first reduction rate;
when the body temperature of the electrolytic capacitor is larger than a third preset temperature and smaller than or equal to a fourth preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to operate at a second preset frequency, wherein the first preset frequency is larger than the second preset frequency;
when the body temperature of the electrolytic capacitor is larger than a fourth preset temperature and smaller than or equal to a first preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to perform frequency reduction operation according to a second descending rate;
wherein, obtain the body temperature of electrolytic capacitor, include:
obtaining a maximum voltage value and a minimum voltage value of two ends of the electrolytic capacitor in a period time, and calculating a voltage difference value of the two ends of the electrolytic capacitor according to the maximum voltage value and the minimum voltage value;
calculating the body temperature of the electrolytic capacitor according to the voltage difference value, and calculating the body temperature of the electrolytic capacitor according to the following formula:
Δu=k×t+a, where Δu is the voltage difference, k is a preset coefficient, T is the body temperature of the electrolytic capacitor, and a is a preset compensation value.
8. An overheat protection control circuit of an electrolytic capacitor in a home appliance, comprising:
the temperature detection unit is used for detecting the body temperature of the electrolytic capacitor;
the control unit is connected with the temperature detection unit and is used for judging the body temperature of the electrolytic capacitor, determining the temperature interval of the body temperature of the electrolytic capacitor when the body temperature of the electrolytic capacitor is less than or equal to a first preset temperature, and controlling the running frequency of the compressor at the rear end of the electrolytic capacitor in a sectional mode according to the temperature interval of the body temperature of the electrolytic capacitor,
the control unit is further adapted to control the control unit,
when the body temperature of the electrolytic capacitor is smaller than or equal to a second preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to operate at a first preset frequency;
when the body temperature of the electrolytic capacitor is larger than the second preset temperature and smaller than or equal to the third preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to perform frequency reduction operation according to a first reduction rate;
When the body temperature of the electrolytic capacitor is larger than a third preset temperature and smaller than or equal to a fourth preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to operate at a second preset frequency, wherein the first preset frequency is larger than the second preset frequency;
when the body temperature of the electrolytic capacitor is larger than a fourth preset temperature and smaller than or equal to a first preset temperature, controlling a compressor at the rear end of the electrolytic capacitor to perform frequency reduction operation according to a second descending rate;
the temperature detection unit comprises a voltage detection unit, the voltage detection unit is connected with the control unit, the voltage detection unit is used for detecting voltages at two ends of the electrolytic capacitor, the control unit is further used for calculating a voltage difference value between a maximum voltage value and a minimum voltage value at two ends of the electrolytic capacitor in a period time according to the voltages at the two ends of the electrolytic capacitor, and calculating the body temperature of the electrolytic capacitor according to the voltage difference value, and the control unit calculates the body temperature of the electrolytic capacitor according to the following formula:
Δu=k×t+a, where Δu is the voltage difference, k is a preset coefficient, T is the body temperature of the electrolytic capacitor, and a is a preset compensation value.
9. The overheat protection control circuit of an electrolytic capacitor in a home appliance of claim 8, wherein the control unit is further configured to control the compressor at the rear end of the electrolytic capacitor to stop when the body temperature of the electrolytic capacitor is greater than a first preset temperature.
10. The overheat protection control circuit of an electrolytic capacitor in a home appliance of claim 8, wherein the temperature detection unit comprises:
the temperature sensor is arranged corresponding to the electrolytic capacitor, and one end of the temperature sensor is connected with a preset power supply;
one end of the first resistor is connected with the other end of the temperature sensor and is provided with a first node, and the other end of the first resistor is connected with the temperature sampling end of the control unit;
one end of the second resistor is connected with the first node, and the other end of the second resistor is grounded;
the positive terminal of the first voltage stabilizing capacitor is connected with the first node, and the other end of the first voltage stabilizing capacitor is grounded;
and one end of the first capacitor is connected with the other end of the first resistor, and the other end of the first capacitor is grounded.
11. The overheat protection control circuit of an electrolytic capacitor in a home appliance of claim 10, wherein the temperature sensor is an NTC thermistor, the NTC thermistor being disposed under a body of the electrolytic capacitor.
12. The overheat protection control circuit of an electrolytic capacitor in a home appliance of claim 10, wherein the temperature sensor is a thermocouple, the thermocouple being disposed inside a body of the electrolytic capacitor.
13. An electric home appliance comprising an overheat protection control circuit of an electrolytic capacitor in the electric home appliance as claimed in any one of claims 8 to 12.
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WO2018094912A1 (en) * 2016-11-25 2018-05-31 广东美的制冷设备有限公司 Control method for compressor, apparatus and household appliance
CN106762586A (en) * 2017-01-03 2017-05-31 安徽美芝制冷设备有限公司 The overtemperature protection of frequency-changeable compressor controls circuit, frequency-changeable compressor system and refrigerator
CN110649571A (en) * 2019-09-12 2020-01-03 上海新时达电气股份有限公司 Over-temperature protection method of variable frequency driver for air conditioner and variable frequency driver thereof
CN111524706A (en) * 2020-04-27 2020-08-11 宁波奥克斯电气股份有限公司 Electrolytic capacitor protection device and method and air conditioner
CN111720981A (en) * 2020-06-01 2020-09-29 青岛海尔空调器有限总公司 Control method of air conditioner compressor and air conditioner

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