Power decoupling circuit

Abstract

The invention relates to a power decoupling circuit. The power decoupling circuit comprises a first diode switching circuit, a second diode switching circuit, a third diode switching circuit, a fourthdiode switching circuit, an inductor and a decoupling capacitor. One end of the first diode switching circuit is connected with a positive electrode of the decoupling capacitor; a negative electrodeof the decoupling capacitor is connected with one end of the second diode switching circuit, the other end of the first diode switching circuit is connected with the other end of the second diode switching circuit and one end of the inductor, and the other end of the inductor is connected with a positive electrode of an output end of the inverter; one end of the third diode switching circuit is connected with the positive electrode of the decoupling capacitor, the negative electrode of the decoupling capacitor is connected with one end of the fourth diode switching circuit, and the other end of the third diode switching circuit is connected with the other end of the fourth diode switching circuit and a negative electrode of the output end of the inverter. The invention aims to improve theworking efficiency of the circuit while reducing the control complexity of the power decoupling circuit.

Description

technical field [0001] The invention relates to the technical field of inverters, in particular to a power decoupling circuit. Background technique [0002] Existing decoupling technologies mainly include PV-level power decoupling, DC-link level, and AC-level three categories. For PV-level power decoupling, Professor Shimizu of Tokyo Metropolitan University once proposed an inverter with a decoupling circuit, which uses the resonance of the inductance and capacitance in the decoupling circuit. So that when the excitation current gradually decreases to zero, the magnetization energy of the excitation winding is transferred to the decoupling capacitor for storage; after that, the excitation current increases in reverse, and the energy stored in the decoupling capacitor is transferred to the secondary load side according to the law of sinusoidal change . This method is theoretically feasible, but in practice, there will be defects such as low energy utilization rate, large en...

AI Technical Summary

Problems solved by technology

Generally speaking, most current-source inverters proposed combine the inverter circuit with the decoupling circuit, making the control extremely complex

[0005] It can be seen that the existing power decoupling circuits are either complicated to control or have low working efficiency. Based on this, it is necessary to provide a power decoupling circuit with simple control and high working efficiency

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