A voltage equalizing circuit with supercapacitors in series

Abstract

The invention discloses a super-capacitor series connection voltage equalizing circuit. The super-capacitor series connection voltage equalizing circuit comprises a full bridge inverter, a voltage multiplying unit and a transformer. The input of the full bridge inverter is connected with the output of the voltage multiplying unit. The full bridge inverter comprises a first full-controlled device, a second full-controlled device, a third full-controlled device, a fourth full-controlled device, four capacitors and four diodes, and four bridge arms are formed by the first full-controlled device, the second full-controlled device, the third full-controlled device and the fourth full-controlled device. Each full-controlled device is connected with one diode and one capacitor in parallel, a source electrode of the first full-controlled device is connected with the first end of a fifth capacitor, the second end of the fifth capacitor is connected with a first inductor in series and then connected with the first end of the transformer, the second end of the transformer is connected with a drain electrode of the fourth full-controlled device, a second inductor is connected between the first end of the transformer and the second end of the transformer in parallel, and the third end and the fourth end of the transformer are connected with the voltage multiplying device. The full-controlled devices are N channel PMOSFETs or IGBTs. A phase-shifted full-bridge control mode is adopted in the full-bridge inverter, and the super-capacitor series connection voltage equalizing circuit has the advantages of being simple in structure and low in loss.

Description

technical field [0001] The invention belongs to a voltage equalizing circuit, in particular to a supercapacitor series voltage equalizing circuit in a supercapacitor energy storage device. Background technique [0002] In the ship electric propulsion system, the energy generated when the ship brakes is huge. As an advanced high-energy storage element, supercapacitor has the characteristics of fast charging and discharging speed, high efficiency, long life, high power density, convenient series and parallel combination, and no pollution to the environment. It can provide and absorb instantaneous high power, so The supercapacitor can be connected in series and parallel as an energy storage device to store the energy generated when the ship brakes to provide the instantaneous huge energy required for the ship to start. However, due to the limitation of materials and manufacturing process level, the internal parameters of supercapacitors are discrete, which will make the voltag...

AI Technical Summary

Problems solved by technology

Its voltage equalization speed is fast, and only a small amount of energy is consumed in the process of voltage equalization, but this method either requires complex real-time detection circuits and control circuits, or requires more switching devices or magnetic components, resulting in a large circuit structure. And complex, the cost also increases, the reliability decreases

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