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Calculation method of back-up period of battery in UPS

A calculation method and technology of discharge time, which is applied in the field of calculation of uninterruptible power supply battery backup time, can solve the problems of poor accuracy, unintuitive, large error in the calculation method of constant current discharge curve, etc.

Inactive Publication Date: 2002-05-15
EMERSON NETWORK POWER CO LTD
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Problems solved by technology

However, in actual use, the load carried by the UPS is generally a rectifying load. When the electrical appliances do not change, its power consumption generally does not change. The battery backup time calculation method based on the constant current discharge curve of the battery, because the battery is in During the discharge process, the voltage keeps dropping, and at the same time, the discharge current must be continuously increased to keep the load power constant, so it is inconvenient and unintuitive to use an hour as the unit of battery capacity at this time, and because the current changes continuously during the discharge process, the battery During the discharge process, the display of the backup time constantly jumps, so the accuracy of the backup time calculation method using the constant current discharge curve as the basic data is poor.
For the re-discharging of the battery during the charging process (that is, when it is not fully charged) and the re-charging of the battery during the discharge process (that is, when it is not fully discharged), the calculation method based on the constant current discharge curve has a large error

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  • Calculation method of back-up period of battery in UPS
  • Calculation method of back-up period of battery in UPS

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Embodiment Construction

[0008] The present invention will be described in further detail below through specific embodiments and in conjunction with the accompanying drawings.

[0009] Unless otherwise specified, the units of all physical quantities in the text are SI units. The exceptions are: 1) The nominal capacity C of the battery is in ampere hours; 2) In the basic data sheet of Table 1, the T given PB The unit is minutes, but the second is still used as the unit in the formula, which only needs to be converted into seconds and substituted into the formula after checking the basic data table.

[0010] The process shown in Figure 1 is actually an application example of the present invention, which includes not only backup time calculation, but also some contents of UPS battery management, such as equalization, floating charge conversion, etc. The so-called equalization charging is to charge the battery with a higher constant voltage. It is generally used when the battery is not fully charged. Se...

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Abstract

The invention discloses a method for calculating back up time of UPS. The reference of back up time is based on time of discharge in constant power. Since the characteristic of rectified load of UPS,the calculated back up time does not preset big jump, with jumping between different discharge curves under constant current being reduced and accuracy being increased in calculating the back up time, except the change, add or substract of load happens. The invention gives a good solution for calculating charge rate and back up time especially in underfill.

Description

Technical field: [0001] The invention relates to a method for calculating the backup time of an uninterruptible power supply battery. Background technique: [0002] For the calculation of battery backup time, the current common calculation method is based on the constant current discharge curve of the battery, using the number of ampere-hours released by the battery and the number of ampere-hours when the battery is charged back. The unit of "Ampere Hour" comes from electrochemistry and is used to calculate the capacity of the battery. When the battery is discharged with a constant current, it is more convenient and intuitive to use the Ampere Hour as the calculation unit. However, in actual use, the load carried by the UPS is generally a rectifying load. When the electrical appliances do not change, its power consumption generally does not change. The battery backup time calculation method based on the constant current discharge curve of the battery, because the battery is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/36H01M10/48H02J7/00
CPCY02E60/12Y02E60/10
Inventor 孟贞生
Owner EMERSON NETWORK POWER CO LTD
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