Method and device for controlling power switch in frequency-variable air conditioner

A technology of power switch and frequency conversion air conditioner, which is applied in the field of control, can solve the problems of affecting the service life of the air conditioner, easy to wear power switch, etc., and achieve the effect of reducing the number of switches and reducing wear

Active Publication Date: 2014-03-26
SUZHOU SAMSUNG ELECTRONICS CO LTD +1
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Problems solved by technology

[0003] In view of this, the present invention provides a method and device for controlling the power switch of an inverter air conditioner, with the purpose of solving the prob

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  • Method and device for controlling power switch in frequency-variable air conditioner
  • Method and device for controlling power switch in frequency-variable air conditioner
  • Method and device for controlling power switch in frequency-variable air conditioner

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[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0039] The embodiment of the present invention discloses a control method of a power switch of an inverter air conditioner, such as figure 1 shown, including:

[0040] S101: judging whether a preset condition is met;

[0041] S102: when a preset condition is met, convert the voltage in the two-phase rotating coordinate system into a three-phase voltage;

[0042] When the preset conditions are not met, the process ends.

[0043] S10...

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Abstract

The embodiments of the invention provide a method and device for controlling a power switch in a frequency-variable air conditioner. A gate voltage is calculated based on a three-phase voltage and the gate voltage is loaded onto the power switch to achieve the effect of controlling the power switch. Compared with the existing power switch control method in the prior art, the method directly utilizes a gate voltage to achieve the effect of controlling the switch-on/-off of upper/lower arms of a power switch, and as the gate voltage is calculated based on a three-phase voltage, the upper/lower arms of the power switch have a certain switch-on/-off retention time during the whole voltage period rather than acting always during the whole voltage period, as a result, the switch-on/-off frequency of the power switch is reduced, and the wear damage of the power switch is reduced.

Description

technical field [0001] The invention relates to the field of control, in particular to a method and device for controlling a power switch in an inverter air conditioner. Background technique [0002] At present, frequency conversion air conditioners are used more and more frequently. The intelligent power module of the frequency conversion air conditioner is its core part. The intelligent power module includes a power switch. The power switch of the frequency conversion air conditioner is usually controlled by the space voltage vector pulse width modulation method, namely: through The sector judgment determines the basic turn-on time of the adjacent voltage vectors of the sector, and controls the power switch IGBT to perform uninterrupted turn-on and turn-off in the entire phase voltage cycle according to the duty cycle, so the switching times of the power switch IGBT are frequent and easy Wear occurs and thus affects the service life of the air conditioner. Contents of th...

Claims

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Application Information

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IPC IPC(8): H02M7/48
Inventor 史奇元
Owner SUZHOU SAMSUNG ELECTRONICS CO LTD
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