Single-stage non-isolated non-electrolytic-capacitor double-Zeta inverter

Abstract

The invention relates to a single-stage non-isolated non-electrolytic-capacitor double-Zeta inverter. The single-stage non-isolated non-electrolytic-capacitor double-Zeta inverter comprises two Zeta circuits capable of realizing buck-boost output and connected in series through output to realize DC / AC single-phase inversion, and has the basic functions that the buck-boost inversion can be realized, and the double-Zeta buck-boost inverter can still realize the inversion function normally when the input direct voltage is smaller or the variation range is wider; the whole circuit is free of a shoot-through phenomenon in a bridge arm, and the reliability is high; the circuit structure is simple, the control is easy, the cost of the whole circuit is low, and the operating efficiency is high; the design of parameters of the circuit is simple, and the parameters of the circuit can be designed according to a design method of a direct current Zeta circuit; as no electrolytic capacitor is arranged in the circuit, the service life of the circuit is long; as inductor current works in a continuous state, EMI is reduced; only four active devices are arranged in the whole circuit, and are two-way devices, so that the circuit can realize two-way flow of energy.

Description

technical field [0001] The invention belongs to the technical field of electrical appliances, and relates to an electric energy conversion device, in particular to a single-stage non-isolated electrolytic capacitor inverter capable of both boosting and stepping down, which is suitable for single-phase inverter applications . Background technique [0002] Energy is the material basis for the survival and development of human beings. The limited and extensive exploitation and utilization of fossil energy have led to the increasingly serious problem of energy shortage, and at the same time caused the deterioration of environmental problems. New energy and renewable energy are getting more and more attention due to their characteristics of large quantity, cleanness and safety, and inverter is a key link in new energy and renewable energy power generation technology. Compared with traditional power generation technologies, the output power of new energy and renewable energy powe...

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Problems solved by technology

The other is an isolation solution, that is, adding a step-up transformer to the inverter to increase the voltage level and achieve electrical isolation, but the addition of the transformer will also increase the system cost and volume and affect the overall conversion efficiency

Obviously, the single-stage non-isolated scheme that can directly realize buck-boost is more in line with the needs of new energy and renewable energy power generation technologies, but large-capacity inverters are used in existing single-stage non-isolated buck-boost inverters. Electrolytic capacitors are used for energy storage. Due to the large volume and short life of electrolytic capacitors, the power density of the inverter is low and the reliability of work is poor. Electrolytic capacitors become the key to limit the service life of the inverter. The future development trend of the transformer

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