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CN-122015258-A - Air conditioner

CN122015258ACN 122015258 ACN122015258 ACN 122015258ACN-122015258-A

Abstract

The embodiment of the application discloses an air conditioner, which comprises a compressor, an external fan and a controller, wherein the controller is configured to judge whether the current running frequency of the compressor reaches a target frequency forbidden point under the condition of adjusting the running frequency of the compressor, determine a target frequency modulation rate according to the current running frequency of the compressor under the condition that the current running frequency of the compressor reaches the target frequency forbidden point, and adjust the running frequency of the compressor according to the target frequency modulation rate. The air conditioner jointly adjusts the operation frequency of the compressor and the rotating speed of the outer fan according to the temperature of the IPM module of the compressor and the temperature of the outer fan, so that the service life of the equipment is prolonged while the heating or refrigerating performance of the compressor is improved.

Inventors

  • GAO YUNLONG

Assignees

  • 海信空调有限公司

Dates

Publication Date
20260512
Application Date
20241112

Claims (10)

  1. 1. An air conditioner, characterized in that the air conditioner comprises: A compressor for compressing a refrigerant circulating through the condenser, the expansion valve and the evaporator; the external fan is used for adjusting outdoor air circulation; The controller is used for acquiring a first junction temperature of the intelligent power module IPM of the compressor, acquiring a second junction temperature of the intelligent power module IPM of the external fan, adjusting the running frequency of the compressor and adjusting the rotating speed of the external fan; The controller is configured to: and acquiring the first junction temperature and the second junction temperature, and adjusting target parameters according to the first junction temperature and the second junction temperature, wherein the target parameters comprise the running frequency of the compressor and/or the rotating speed of the external fan.
  2. 2. The air conditioner of claim 1, wherein the controller adjusts a target parameter according to the first junction temperature and the second junction temperature, and is configured to: determining a target compressor temperature interval in which the first junction temperature is located and a target external fan temperature interval in which the second junction temperature is located; and adjusting the running frequency of the compressor and the rotating speed of the external fan according to the target compressor temperature interval, the target external fan temperature interval and a preset mapping relation, wherein the preset mapping relation comprises a plurality of preset compressor temperature intervals, a plurality of preset external fan temperature intervals and a plurality of mapping relations of values of the target parameters.
  3. 3. The air conditioner of claim 2, wherein the plurality of preset compressor temperature intervals includes a first compressor temperature interval, a second compressor temperature interval, a third compressor temperature interval, a fourth compressor temperature interval, and a fifth compressor temperature interval, the plurality of preset outer fan temperature intervals includes a first outer fan temperature interval, a second outer fan temperature interval, a third outer fan temperature interval, a fourth outer fan temperature interval, and a fifth outer fan temperature interval, the controller adjusting an operating frequency of the compressor and a rotational speed of the outer fan according to the target compressor temperature interval, the target outer fan temperature interval, and a preset map, configured to: and when the first junction temperature is in the first compressor temperature interval and the second junction temperature is in the first external fan temperature interval, increasing the operating frequency of the compressor at a first frequency increasing rate and increasing the rotating speed of the external fan at a first acceleration, or, When the first junction temperature is in the second compressor temperature interval and the second junction temperature is in the second external fan temperature interval, maintaining the rotation speed of the external fan unchanged, and increasing the operating frequency of the compressor at a second frequency increasing rate, or, When the first junction temperature is in the third compressor temperature interval and the second junction temperature is in the second external fan temperature interval, maintaining the running frequency of the compressor unchanged, and increasing the rotating speed of the external fan with a second acceleration, or, Maintaining the operating frequency of the compressor and the rotational speed of the external fan unchanged when the first junction temperature is in the third compressor temperature interval and the second junction temperature is in the third external fan temperature interval, or, Reducing the operating frequency of the compressor at a first frequency reduction rate and reducing the rotational speed of the external fan at a third acceleration when the first junction temperature is in the fourth compressor temperature interval and the second junction temperature is in the fourth external fan temperature interval; wherein the first frequency-raising rate is greater than the second frequency-raising rate, and the first acceleration is greater than the second acceleration.
  4. 4. The air conditioner of claim 3, wherein, with the first junction temperature in the third compressor temperature interval and the second junction temperature in the second outside air fan temperature interval, the controller maintains the operating frequency of the compressor unchanged, and after increasing the rotational speed of the outside air fan at a second acceleration, the controller is further configured to: after a first time period, acquiring the change rate of the first junction temperature in the first time period, and adjusting the running frequency of the compressor and the rotating speed of an external fan according to the change rate of the first junction temperature and a first change threshold value; increasing the operating frequency of the compressor by a target frequency value if the rate of change of the first junction temperature is less than the first change threshold; and increasing the rotating speed of the external fan by a target rotating speed value under the condition that the change rate of the first junction temperature is larger than or equal to the first change threshold value.
  5. 5. The air conditioner of claim 4, wherein the target frequency value is a product of the first time period and the second frequency modulation rate, and the target rotation speed value is twice a product of the first time period and the second acceleration.
  6. 6. The air conditioner of claim 4, wherein, with the first junction temperature being in the fourth compressor temperature interval and the second junction temperature being in the fourth outside blower temperature interval, the controller is further configured to, after decreasing the operating frequency of the compressor at a first down rate and decreasing the rotational speed of the outside blower at a third acceleration: After a second period of time, acquiring the change rate of the first junction temperature in the second period of time, and adjusting the running frequency of the compressor and the rotating speed of the external fan according to the change rate of the first junction temperature and a second change threshold value; Reducing the rotating speed of the external fan by fourth acceleration under the condition that the change rate of the first junction temperature is smaller than the second change threshold value; Reducing the operating frequency of the compressor at a second frequency reduction rate if the rate of change of the first junction temperature is greater than or equal to the first change threshold; Wherein the fourth acceleration is greater than the third acceleration, and the second rate of frequency reduction is greater than the first rate of frequency reduction.
  7. 7. The air conditioner of claim 3, wherein the controller is further configured to: Closing the compressor when the first junction temperature is in the fifth compressor temperature interval and the second junction temperature is not in the fifth external fan temperature interval; And under the condition that the second junction temperature is in the temperature interval of the fifth external fan, the compressor and the external fan are closed.
  8. 8. The air conditioner of claim 7, wherein after the controller turns off the compressor, the controller is further configured to: acquiring the first junction temperature, and judging whether the first junction temperature is smaller than a starting temperature threshold of a compressor or not; starting the compressor when the first junction temperature is less than the compressor starting temperature threshold; after the controller turns off the external fan, the controller is further configured to: acquiring the second junction temperature, and judging whether the second junction temperature is smaller than an external fan starting temperature threshold value or not; opening the outer fan under the condition that the second junction temperature is smaller than the opening temperature threshold value of the outer fan; the compressor starting temperature threshold is located in the first compressor temperature interval, and the external fan starting temperature threshold is located in the first external fan temperature interval.
  9. 9. An air conditioner according to any one of claims 1 to 8, wherein the junction temperature of the intelligent power module IPM is equal to the sum of the ambient temperature and the temperature rise, which is equal to the product of the device power loss and the ambient thermal resistance.
  10. 10. The air conditioner of claim 9 wherein the device loss power is determined by a loss power of a single insulated gate bipolar transistor IGBT and a loss power of a fast recovery diode FRD, the loss power of the IGBT including a turn-on loss power of the IGBT and a switch loss power of the IGBT, the loss power of the FRD including a turn-on loss power of the FRD and a reverse recovery loss power of the FRD.

Description

Air conditioner Technical Field The invention relates to the technical field of air conditioners, in particular to an air conditioner. Background In daily life, in order to achieve better refrigerating or heating effect, the air conditioner generally exerts better performance by improving the running frequency of the compressor, the running frequency of the compressor is improved, the junction temperature of the IPM module of the compressor is correspondingly improved, the rotating speed of the external fan is improved to cool the compressor, the junction temperature of the IPM module of the external fan is correspondingly improved, and the performance of the IPM module is reduced and the service life of the IPM module is shortened due to overhigh junction temperature of the IPM module. In the related art, the operation frequency of the compressor and the rotation speed of the external fan are often adjusted according to the external environment temperature, but the junction temperature of the IPM module is not only related to the environment temperature, but also related to the power loss of the power device, so that the risk of over-temperature of the IPM module when the operation frequency of the compressor is too high is caused. Therefore, how to avoid the over-temperature of the IPM module of the compressor and the external fan while fully exerting the refrigerating or heating performance of the compressor is a problem to be solved. Disclosure of Invention The embodiment of the application discloses an air conditioner, which is characterized in that the operation frequency of a compressor and the rotating speed of an external fan are comprehensively regulated according to the temperature interval where the first junction temperature and the second junction temperature are positioned by respectively obtaining the first junction temperature of the compressor IPM module and the second junction temperature of the external fan IPM module, so that the over-temperature of the compressor IPM module and the external fan IPM module is avoided while the heating or refrigerating performance of the compressor is fully exerted. The embodiment of the application discloses an air conditioner, which comprises: A compressor for compressing a refrigerant circulating through the condenser, the expansion valve and the evaporator; the external fan is used for adjusting outdoor air circulation; The controller is used for acquiring a first junction temperature of the intelligent power module IPM of the compressor, acquiring a second junction temperature of the intelligent power module IPM of the external fan, adjusting the running frequency of the compressor and adjusting the rotating speed of the external fan; The controller is configured to: and acquiring the first junction temperature and the second junction temperature, and adjusting target parameters according to the first junction temperature and the second junction temperature, wherein the target parameters comprise the running frequency of the compressor and/or the rotating speed of the external fan. In the technical scheme, the intelligent control of the working state of the air conditioner can be realized by acquiring the junction temperature of the intelligent power module IPM of the compressor and the external fan and adjusting the frequency of the compressor and the rotating speed of the external fan according to the junction temperature, so that the energy efficiency and the stability of the air conditioner are improved, the damage caused by overheating is avoided, and the service life of equipment is prolonged. In one possible embodiment, the controller adjusts a target parameter according to the first junction temperature and the second junction temperature, and is configured to: determining a target compressor temperature interval in which the first junction temperature is located and a target external fan temperature interval in which the second junction temperature is located; and adjusting the running frequency of the compressor and the rotating speed of the external fan according to the target compressor temperature interval, the target external fan temperature interval and a preset mapping relation, wherein the preset mapping relation comprises a plurality of preset compressor temperature intervals, a plurality of preset external fan temperature intervals and a plurality of mapping relations of values of the target parameters. In the technical scheme, the junction temperature is corresponding to the target temperature interval and is regulated by combining with the preset mapping relation, so that the fine control on different temperature intervals is effectively realized, the adaptability of the air conditioner under different environmental conditions is improved, and the intelligent level of the system is enhanced. In one possible embodiment, the plurality of preset compressor temperature intervals includes a first compressor temperature interval, a se