Lithium battery charging device and method thereof

Abstract

The invention relates to a lithium battery charging device and a method thereof. The lithium battery charging device comprises an input circuit component, a boost circuit, a charging control system, a battery pack, a self-oscillating reverse excitation circuit and a load circuit. The boost circuit and the charging control circuit are connected with the input circuit component, the battery pack and the self-oscillating reverse excitation circuit are connected with the boost circuit, and the load circuit is connected with the self-oscillating reverse excitation circuit. The charging control system is connected with the load circuit and controls the load circuit. The lithium battery charging device and the method thereof have the advantages that two modes including high-power charging and constant-voltage charging are achieved through the boost circuit and the charging control system, and thus, a lithium battery is charged with electricity generated by a low-voltage photovoltaic module; through output and an RCC quasi-resonance soft-switching technology of the self-oscillating reverse excitation circuit, softening of a power switch is achieved, so that conversion efficiency is improved and electromagnetic interference is reduced; multiple voltage output can be realized conveniently by the reverse excitation circuit, so that application range of the lithium battery is widened.

Description

technical field [0001] The invention relates to a battery charging method, in particular to a charging device and method for charging a photovoltaic module into a lithium battery. Background technique [0002] As a new generation of energy storage medium, lithium batteries have the advantages of fast high-current charging and high-current over-discharge. The current charging input of lithium batteries generally uses a single USB power input, so it cannot be used in places where the input power cannot be obtained. Realize the application of lithium batteries, and solar energy, as a broad and common new energy source, can be obtained anywhere. Using solar modules as a charging method for lithium batteries will greatly increase the utilization space of lithium batteries. At present, the control method of the battery pack energy conversion system is generally implemented by analog control, which cannot achieve precise control and protection of energy efficiency. The general lea...

AI Technical Summary

Problems solved by technology

At present, the control method of the battery pack energy conversion system is generally implemented by analog control, which cannot achieve precise control and protection of energy efficiency. The general lead-acid battery uses photovoltaic modules as input without considering its output efficiency, but as lithium batteries have The ability to charge with a large current, then the requirement for the maximum power capture of photovoltaic modules will be very important

For the general battery output circuit, the BUCK circuit is generally used for output, so the BUCK circuit does not have the isolation function, and it is inconvenient to realize multiple outputs, while the general flyback circuit is used, and its switch is a hard switch mode.

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