Battery equalizer formed by multi-winding transformer

Abstract

The invention discloses a battery equalizer formed by a multi-winding transformer, which is characterized in that multiple windings with the same turns and different winding directions are arranged on a magnetic core; each winding is serially connected with a switch transistor to form a single-transistor forward circuit or a complementary push-pull circuit to be parallelly connected onto the positive electrode and the negative electrode of each battery, which is as shown as in a figure 1. According to two wiring directions of the windings, switch transistors corresponding to the single-transistor forward circuits are divided into an A group of switch transistors and a B group of switch transistors, the A group of switch transistors and the B group of switch transistors are alternatively conducted and cut off when the circuit works, the interval time is the same, and the switch frequency adopts a high frequency. By using the working feature that the single-transistor forward circuits and the complementary push-pull circuits are combined together, natural magnetic reset of the magnetic core is realized, and voltage balancing of the whole battery pack can also be realized. in order to improve the balancing ability and adapt to balancing of a more number of battery packs, further measures are adopted: all single-transistor forward circuits are changed into the complementary push-pull circuit; and multiple transformers are used, secondary windings are added on the magnetic core of the transformer, and all secondary windings are all parallelly connected according to a principle that homonymous ends are parallelly connected.

Description

technical field [0001] This patent relates to the battery field, specifically a battery equalizer composed of a multi-winding transformer. Background technique [0002] For the battery pack to work normally and give full play to its efficacy, a battery equalizer must be used. Although lithium batteries have appeared for many years, the development of battery equalizers is very slow. Currently, there are very few equalizers that can be used on the market. . It is the common desire and goal of people to obtain a voltage equalizer with good cost performance. [0003] The easiest way is to wind multiple windings on a magnetic core to make a voltage equalizer. Although many people have tried this, they have not achieved meaningful results. The reason is that the magnetic reset circuit has not given correct processing, so that There are two results: 1. The magnetic core cannot be reset, so the actual machine cannot be made; 2. A special magnetic reset circuit must be added, whic...

AI Technical Summary

Problems solved by technology

[0003] The easiest way is to wind multiple windings on a magnetic core to make a voltage equalizer. Although many people have tried this, they have not achieved meaningful results. The reason is that the magnetic reset circuit has not given correct processing, so that There are two results obtained: 1. The magnetic core cannot be reset, so the actual machine cannot be made; 2. A special magnetic reset circuit must be added, which results in an increase in the size and cost of the circuit and a decrease in conversion efficiency.

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