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Over-temperature protection method of variable frequency drive for air conditioner and its variable frequency drive

A variable frequency drive, over-temperature protection technology, applied in emergency protection circuit devices, modification of power electronics, cooling/ventilation/heating transformation, etc. Unable to realize problems such as overheating protection, to achieve reliable overtemperature protection, overcoming slow speed and hysteresis, and fast frequency reduction protection.

Active Publication Date: 2022-01-18
SHANGHAI STEP ELECTRIC +1
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

This solution mainly has the following disadvantages: 1. The temperature change of the radiator module is slow. Compared with the power module of the variable frequency drive, the temperature change is obviously lagging behind, which leads to the inability to respond to the overtemperature state of the variable frequency drive in time, thereby affecting the overtemperature protection effect; 2. , the reliability needs to be improved
Once the temperature sensor fails, it will not be able to achieve overheating protection

Method used

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  • Over-temperature protection method of variable frequency drive for air conditioner and its variable frequency drive

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Embodiment Construction

[0012] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0013] see figure 1 . According to an embodiment of the present invention, an over-temperature protection method for a variable frequency drive for an air conditioner includes the following steps:

[0014] Obtain the temperature information of the radiator module of the variable frequency drive and the temperature information of the power module;

[0015] When Temp1≤T1<Temp2, control the variable frequency drive to increase the frequency slowly; when Temp2≤T1<Temp3, control the variable frequency drive to prohibit frequency up; when Temp3≤T1<Temp4, control the variable frequency drive to slow down; When Temp4, control the variable frequency drive to rapidly reduce the frequency, and control the variable frequency drive to stop the rapid frequency reduction when the preset rapid frequency reduction stop condition is met; wherein, T1 is the t...

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Abstract

An over-temperature protection method for a variable frequency drive for an air conditioner, comprising: acquiring temperature information of a radiator module and a power module of the variable frequency drive; when Temp1≤T1<Temp2, controlling the frequency conversion drive to increase the frequency slowly, and when Temp2≤T1<Temp3 When Temp3≤T1<Temp4, control the frequency conversion drive to reduce the frequency slowly, when T2≥Temp4, control the frequency conversion drive to rapidly reduce the frequency; among them, T1 is the temperature of the radiator module, T2 is The temperature of the power module. Temp1 is the temperature threshold for slow frequency upscaling, Temp2 is the temperature threshold for prohibiting upscaling, Temp3 is the temperature threshold for slow downscaling, and Temp4 is the temperature threshold for fast downscaling. The invention also provides a variable frequency driver. The invention can timely respond to the over-temperature state of the variable frequency drive and make corresponding protection, and has high reliability.

Description

technical field [0001] The invention relates to the frequency conversion air conditioner technology, in particular to the overtemperature protection technology of the frequency conversion driver for the air conditioner. Background technique [0002] With the gradual elimination of fixed-frequency machines, variable-frequency drives are more and more widely used in air conditioners. In order to avoid overheating damage, the existing variable frequency drives for air conditioners usually have an over-temperature frequency reduction protection function. The control module of the variable frequency drive compares the temperature of the radiator module of the variable frequency drive detected by the temperature sensor with the preset temperature threshold. Throttle down when the temperature threshold is exceeded. This solution mainly has the following disadvantages: 1. The temperature change of the radiator module is slow. Compared with the power module of the variable frequency...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/12F24F11/32H05K7/20
CPCH02H7/12F24F11/32H05K7/2089
Inventor 王亮平雷发胜李权何锡山
Owner SHANGHAI STEP ELECTRIC
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