Charger current-limiting control method, charger current-limiting control device and uninterrupted power supply system
A current-limiting control and charger technology, applied in the direction of circuit devices, battery circuit devices, collectors, etc., can solve the problems of hardware cost increase, waste, battery unsaturation, etc., to ensure charging power, reliability, and flexible control Effect
Active Publication Date: 2013-06-26
INVT POWER SYST SHENZHEN CO LTD +1
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Problems solved by technology
One is to choose a power device with a higher rated current for the rectifier in the UPS system, but this will inevitably bring about an increase in hardware costs, and it is largely a waste
The other is to turn off the UPS charger directly when the input current of the rectifier reaches a certain set value, but this may cause the battery to be in an unsaturated state for a long time, making it unable to provide the designed discharge time, so that the continuous power supply of the load cannot be guaranteed. , reducing the reliability of the UPS system
Method used
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[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.
[0027] Embodiments of the present invention provide a charger current limiting control method, device and uninterruptible power supply system. Each will be described in detail below.
[0028] This embodiment will be described from the perspective of the current limiting control device. The current limiting control device can be implemented as an independent entity, or can be integrated in a microprocessor (MCU, Micro Controller Unit).
[0029] A charger current limiting cont...
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The embodiment of the invention discloses a charger current-limiting control method, a charger current-limiting control device and an uninterrupted power supply system. In the embodiment of the invention, the adjusting parameters such as maximum allowable working current, input voltage, rectifier efficiency, inverter output efficiency, inverter efficiency, charger efficiency and the like of the rectifier are obtained; subsequently the allowable maximum charging power of the charger is calculated according to the adjusting parameters; and finally the practical charging current is limited according to the allowable maximum charging power of the charger and the charging current limiting condition of the prearranged battery. In the invention, as the adjusting parameters related to the calculation charging current can be obtained in real time, the charging current can be limited more exactly, flexibly and timely, thus ensuring the charging efficiency of the UPS (uninterrupted power supply)charger and ensuring the reliability of the UPS system.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a charger current limiting control method, device and uninterruptible power supply (UPS, Uninterruptible Power System) system. Background technique [0002] In a digital uninterruptible power supply (UPS, Uninterruptible Power System) system, when the voltage on the input side is low and the load on the UPS system is large, the current on the input side will increase, and sometimes it may exceed the safety of each device in the UPS system. For this reason, it is necessary to reduce the charging power of the UPS charger in this case, or even turn off the UPS charger, that is, it is necessary to limit the current of the UPS charger. [0003] There are currently two types of workarounds for this problem. One is to choose a power device with a higher rated current for the rectifier in the UPS system, but this will inevitably bring about an increase in hardware costs, and i...
Claims
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IPC IPC(8): H02J7/00
CPCY02E60/10
Inventor 刘琴
Owner INVT POWER SYST SHENZHEN CO LTD