A Filtering Method Applied to Ups Bus Voltage Sampling

A bus voltage and voltage limiting technology, which is applied in the field of analog signal sampling and processing, can solve the problems that the bus voltage is easily disturbed and affects the stability of the inverter system, etc., and achieves the simple and practical effect of the filtering method
CN110988448BActive Publication Date: 2022-02-08厦门市爱维达电子有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
厦门市爱维达电子有限公司
Publication Date
2022-02-08

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Abstract

For UPS, the accuracy of bus voltage sampling is particularly important. In order to effectively filter out sampling burrs caused by interference, the present invention continuously collects the sampling signal values ​​of N bus voltages and sorts them, takes two values ​​in the middle of the value and calculates their average value, which is recorded as this time The processed value avg_cur sampled from the bus voltage Udc is compared with the last sampled processed value avg_pre, and the Udc voltage change limit value Limit is set, and the value is a positive number. If avg_cur is greater than the sum of avg_pre and Limit, take the sum of avg_pre and Limit as the current bus voltage Udc; if avg_cur is less than the difference between avg_pre and Limit, then use the difference between the avg_pre and the Limit as the current bus voltage value Udc; otherwise, take the avg_cur as the current bus voltage Udc. The filtering method of the present invention is simple and practical, and can reduce the computing overhead of the CPU as much as possible so as to meet the real-time requirement of participating in the control computing.
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Description

technical field

[0001] The invention relates to the field of analog signal sampling and processing, in particular to a filtering method applied to UPS bus voltage sampling. Background technique

[0002] With the development of information technology, UPS (Uninterruptible Power System / Uninterruptible Power Supply, uninterruptible power supply) is widely used in banking, securities, military, medical, aerospace and many other fields to protect some loads sensitive to power supply such as computer systems , communication systems, medical systems, etc. For the entire UPS system architecture, it can be said that the inverter is the core of the uninterruptible power supply system and determines the quality of the output voltage waveform.

[0003] For UPS power supply, the accuracy of bus voltage sampling is particularly important, which not only affects the charging and discharging management of UPS power supply, but also affects the voltage quality of inverter control and invert...

Claims

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