Mains supply abnormality detection method
An electrical abnormality detection and electrical signal technology, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., to achieve stable detection time, avoid UPS malfunction, and low cost
Inactive Publication Date: 2020-03-13
DELTA ELECTRONICS INC
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Problems solved by technology
[0008] The purpose of the present disclosure is to provide a method for abnormal detection of mains electricity, and then overcome the problems caused by the limitations and defects of related technologies at least to a certain extent
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Embodiment approach
[0057] According to some example implementations of the present disclosure, it is possible to quickly and effectively respond to the abnormality of the mains power, the detection time is stable, the detection cost is low, and the abnormality of the mains power can be quickly judged, so that the user equipment can be provided with backup power in time, and the user can be prevented from being injured due to power failure. incur losses. According to some example implementations of the present disclosure, it is possible to effectively avoid UPS malfunctions caused by normal power grid fluctuations and sampling signal interference.
[0058] According to some example implementations of the present disclosure, because the detection method is simple and reliable, a controller with low cost can be used, which can further reduce the cost of the UPS power supply system, especially the cost of the low-power UPS power supply system.
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The mains supply abnormality detection method comprises the following steps of: converting a mains supply signal into a high-low level signal, performing phase locking by utilizing a zero crossing point of the high-low level signal to obtain a plurality of sampling points in a mains supply period, sampling the mains supply signal in each mains supply period, and sequentially storing the sampling value of each sampling point in a table so as to correspondingly update the first storage value of each sampling point, at any sampling point, taking a sampling value at the sampling point as a first signal, and reading a first storage value of another sampling point with phase lag of 90 degrees as a second signal, calculating the sum of squares of the first signal and the second signal to obtain athird signal, and comparing the third signal with a reference value to obtain a difference value, and when the absolute value of the difference value of a plurality of continuous sampling points is greater than a first set value, judging that the mains supply is abnormal. The detection method can quickly and effectively respond to mains supply abnormality, is stable in detection time and low in detection cost, can provide standby electric energy for user equipment in time, and avoids loss caused by power failure of a user.
Description
technical field [0001] The present disclosure relates to the field of electric power detection and UPS application, and in particular, relates to a method for detecting abnormality of mains power. Background technique [0002] The UPS (Uninterruptible Power Supply, uninterruptible power supply) system converts the electric energy of the battery into the electric energy required by the user equipment through circuits such as inverters when the mains power is abnormal. Therefore, it is very important to judge the abnormality of the mains power in the UPS system. [0003] Usually, the mains abnormality includes the mains power is too high, too low, power failure abnormality; traditional detection methods include hardware detection, software detection and so on. [0004] Hardware detection is mainly to divide and filter the grid voltage through some analog circuits, and through the RC (resistor-capacitor, ie resistance-capacitance) charging circuit, judge the abnormality of the...
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IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 熊亮徐文康
Owner DELTA ELECTRONICS INC