Temperature control method of intelligent power module and frequency conversion device

Abstract

The invention discloses a temperature control method of an intelligent power module and a frequency conversion device. The method comprises the steps that the inner temperature Tc of the intelligent power module is detected; when the temperature Tc approaches a set safety threshold Tmax, the output frequency of the intelligent power module is controlled to descend or the current frequency is maintained, so that the rise of the temperature of the intelligent power module is limited. According to the temperature control method of the intelligent power module, frequency rise limitation motion or frequency reduction motion is conducted before the inner temperature of the intelligent power module reaches the protecting detection temperature, so that the temperature of the intelligent power module is controlled in a safe range all the time without protecting detection, the intelligent power module is operated stably at the safe and reliable temperature, meanwhile, the consistency of system operation is guaranteed, and the use comfort of frequency conversion household appliance users is improved.

Description

technical field [0001] The invention belongs to the technical field of frequency conversion systems, and in particular relates to a method for controlling the temperature rise of an intelligent power module and a frequency conversion device designed using the temperature control method. Background technique [0002] In the current frequency conversion air conditioner or other frequency conversion household appliances, the intelligent power module IPM is often used, and its function is to convert the DC power into AC power under the action of the input control signal and load it to the controlled object such as the compressor or the motor. Above, it drives the compressor or the motor to run, and by changing the frequency of the AC power applied to the compressor or the motor, the automatic control of the speed of the compressor or the motor is realized. Since such an intelligent power module often works under high current and high temperature, it is prone to failures such as...

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Problems solved by technology

[0004] With this kind of protection measures, once the internal temperature Tc of the intelligent power module is too high and the system executes the protection detection action, it will often cause the system to run incoherently, which will cause troubles to the users of home appliances.

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