Frequency converter fault detection method and device
A technology of fault detection and frequency converter, which is applied in the field of frequency converter, and can solve problems such as the failure of the frequency converter to operate normally, the lack of phase of the power supply, damage to the rectifier bridge and filter capacitor of the frequency converter, etc.
Inactive Publication Date: 2017-10-13
TCL AIR CONDITIONER ZHONGSHAN CO LTD +1
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Problems solved by technology
[0002] Due to the complex working environment of the air-conditioning inverter, sometimes there will be a phase loss of the power supply. If the inverter continues to run in the absence of a phase, it will cause a sharp increase in the current of one phase of the three-phase voltage input by the power supply. The filter capacitor in the DC bus of the inverter is repeatedly charged with a large current, which will cause damage to the rectifier bridge and filter capacitor in the inverter, which will cause the entire inverter to fail to operate normally
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[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with 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, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.
[0028] It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present invention, the directional indication is only used to explain that it is in a specific posture (as shown in the drawings). If the specific posture changes, the relative positional relationship, movement, etc. of the components below will also change the directional indication accordingly.
[0...
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The invention discloses a frequency converter fault detection method and device. The frequency converter fault detection method comprises the following steps that the corresponding line voltage Vab, Vbc and Vca corresponding to the voltage of every two phases of the three-phase AC power supply of a frequency converter are acquired; and the phase loss / zero and live line reverse connection / power voltage imbalance fault of the frequency converter can be determined when the voltage difference absolute value between any two line voltage of the line voltage Vab, Vbc and Vca is greater than a preset voltage difference value. The zero and live line reverse connection or voltage three-phase power voltage imbalance fault of the frequency converter can be detected so that the safety of the frequency converter can be guaranteed and the service life of the frequency converter can be enhanced.
Description
Technical field [0001] The present invention relates to the technical field of frequency converters, and in particular to a method and device for detecting inverter faults. Background technique [0002] Due to the complicated working environment of the air conditioner inverter, sometimes the power supply lacks phase. If the inverter continues to run in the absence of phase, it will cause the current of one phase of the three-phase voltage input by the power supply to increase sharply. The filter capacitor in the DC bus of the inverter is repeatedly charged with high current. This will cause damage to the rectifier bridge and filter capacitor in the inverter, which will cause the entire inverter to fail to operate normally. Summary of the invention [0003] The main purpose of the present invention is to provide a frequency converter fault detection method and device, which aims to detect whether the frequency converter has faults such as phase loss, reverse connection of the zero ...
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IPC IPC(8): G01R31/42
CPCG01R31/42
Inventor 范立荣徐经碧丘永青黄滔许纹倚于华平
Owner TCL AIR CONDITIONER ZHONGSHAN CO LTD