Single-phase high-frequency link inverter and modulation method thereof

By dividing the secondary-side switching transistors into high-frequency and power-frequency combinations in a single-phase high-frequency chain inverter, zero-voltage turn-on is achieved using a resonant circuit, and voltage spikes are suppressed using hybrid devices and diode full-bridge circuits. This solves the problems of high switching losses and cost in high-frequency chain inverters, achieving efficient and low-cost voltage spike suppression and reduced switching losses.

CN122292840APending Publication Date: 2026-06-26QINGDAO UNIV
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Patent Information

Application Number
CN202610430816.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-02
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Existing high-frequency chain inverters suffer from high switching losses, poor voltage spike suppression, complex soft-switching implementation, and difficulty in balancing cost and efficiency.

Method used

A single-phase high-frequency chain inverter is adopted. By dividing the secondary-side switching transistors into high-frequency and power-frequency combinations, a resonant circuit is formed by parallel capacitors and transformer leakage inductance to achieve zero-voltage turn-on of the primary-side switching transistors. Voltage spikes are suppressed by diode full-bridge circuit. SiC MOSFETs and Si IGBT devices are used in combination to balance efficiency and cost.

Benefits of technology

This achieves voltage spike suppression of the secondary-side switch, reduces switching losses, simplifies the modulation strategy, reduces costs, and improves system reliability and efficiency.

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Abstract

The invention belongs to the technical field of power electronics, and particularly relates to a single-phase high-frequency link inverter and a modulation method thereof, and the inverter comprises a primary side full-bridge inverter circuit which comprises primary side switching tubes K1, K3, K2 and K4; the secondary side full-bridge cycle converter comprises secondary side switch tubes S1a, S2a, S3b, S4b, S1b, S2b, S3a and S4a; the high-frequency transformer is used for connecting the primary side full-bridge inverter circuit and the secondary side full-bridge cycle converter; the voltage spike suppression circuit comprises a D1, a D3, a D2 and a D4; the input end of the full-bridge circuit is connected with a secondary winding of the high-frequency transformer in parallel, and the output end of the full-bridge circuit is connected with a direct-current power supply.
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