Equalizer circuit for backup power supply

Abstract

A voltage equalizing circuit for a backup power supply, the backup power supply includes n power supply units connected in series, the voltage equalizing circuit includes a sampling resistor Rs, an input switch circuit, a transformer T1, and n output rectifying and filtering circuits; The input switching circuit is connected in series with the primary side of the transformer T1 and connected to both ends of the backup power supply through the sampling resistor Rs; the secondary side of the transformer T1 is provided with n step-down output terminals, and the output voltage of each step-down output terminal is exactly the same and Tightly coupled; each of the rectification and filter circuits is connected to a step-down output terminal, and each of the rectification and filter circuits and the input switch circuit form a single-ended flyback; each of the rectification and filter circuits is respectively connected to each power supply Monomers connected in parallel. The invention can not only prevent the unbalanced voltage of the series power supply units, but also make full use of the capacity of each power supply unit, and at the same time reduce the loss caused by voltage equalization.

Description

technical field [0001] The invention relates to a backup power supply, which is mainly designed for accumulators or supercapacitors, especially series accumulators or supercapacitors. Background technique [0002] A large number of DC power supplies or uninterruptible power supplies are used in the fields of communication, electric power, finance, insurance, etc., and these power supplies use battery packs as backup power supplies. Because these voltages are relatively high, a group of batteries are usually used in series. Usually, 24 2V batteries are connected in series, and 104 2V batteries are usually connected in series for electric DC power supply. With the development of supercapacitor technology, its application is becoming more and more extensive, especially in electric vehicles. However, the withstand voltage of large-capacity supercapacitors is only about 1.6V. For applications with relatively high voltage requirements, it usually takes dozens of Even hundreds of ...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the disadvantages of poor applicability and large loss caused by voltage equalization of the existing backup power supply voltage equalization circuit, the present invention provides a circuit that can prevent the voltage imbalance of the battery pack or super capacitor group in series and make full use of the battery pack. The capacity of the bank or super capacitor bank, and the voltage equalizing circuit of the backup power supply that reduces the loss caused by voltage equalization

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