Fault detection method and fault detection circuit of three-phase alternating current source
A technology of three-phase AC and fault detection, which is applied in the field of power electronics, to achieve the effect of avoiding false alarms of faults and reliable detection methods
Pending Publication Date: 2020-12-11
LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA
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[0005] The purpose of this application is to provide a fault detection method and a fault detection circuit of a three-phase AC source to solve or alleviate at least one problem in the background technology
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[0036] In order to make the purpose, technical solution and advantages of the application more clear, the technical solution in the embodiment of the application will be described in more detail below in conjunction with the drawings in the embodiment of the application.
[0037] In order to overcome such as figure 1 When faults such as power failure, phase loss, and overvoltage occur in the three-phase AC source shown, the prior art cannot effectively distinguish faults such as power failure, phase loss, undervoltage, and overvoltage, and quickly send fault signals to the main The control circuit or the post-stage circuit can effectively ensure the normal operation of the power supply so as not to cause more damage. The application provides a three-phase AC source fault detection method and a fault detection circuit.
[0038] Such as figure 2 As shown, the method of the present application judges by continuously sampling the rectified voltage values of two three-phase AC...
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The invention provides a fault detection method for a three-phase alternating current source. The method comprises the following steps that: the voltage of the three-phase alternating current source is acquired; the voltage difference between the voltage of the three-phase alternating current source at the current moment and the voltage at the previous moment isjudged; when the voltage differenceis negative, and the voltage at the current moment is larger than a first threshold value, it is judged that the three-phase alternating current source is normal; when the voltage difference is negative, the difference value is larger than a second threshold value, and the voltage at the current moment is smaller than the first threshold value, it is judged that the three-phase alternating currentsource is in a power-down state; when the voltage difference is negative, the difference value is smaller than the second threshold value, and the voltage at the current moment is smaller than the first threshold value, it is judged that the three-phase alternating current source current is in an open-phase state; and when the voltage difference is positive and the voltage at the current moment is greater than a third threshold value, it is judged that the three-phase alternating current source current is in an overvoltage state. According to the method of the invention, the fault condition of the three-phase alternating current source is judged by comparing the rectified voltage values at two continuous moments, various fault modes such as power failure and default phase when the voltagedrops can be effectively distinguished and detected, and the accuracy is high.
Description
technical field [0001] The application belongs to the technical field of power electronics, and in particular relates to a three-phase AC source fault detection method and a fault detection circuit. Background technique [0002] Three-phase AC power supply is a common power supply method, which is widely used in various high-power electrical equipment and aviation power supply. When the three-phase power supply has faults such as instantaneous power failure, phase loss, overvoltage, etc., it is necessary to report the power failure fault signal to the subsequent stage circuit, so that the latter stage circuit can deal with it in time to prevent a wider range of damage. Undervoltage will not be processed. [0003] For example, when the common 50ms instantaneous power failure occurs in aviation power supply, if the power failure signal cannot be sent to the subsequent stage circuit in time, and some subsequent stage circuits that do not need to work during the power failure a...
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IPC IPC(8): G01R31/42
CPCG01R31/42
Inventor 戴钱坤施宏许政
Owner LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA