Power conversion device and control method

The power conversion device addresses inefficiencies in switching frequency and phase shift control by using a ZVS detection circuit to adjust switching frequencies and phase shift amounts, enhancing efficiency under varying loads.

WO2026115804A1PCT designated stage Publication Date: 2026-06-04PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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Patent Information

Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
Filing Date
2025-08-05
Publication Date
2026-06-04

AI Technical Summary

Technical Problem

Existing power conversion devices fail to achieve high efficiency due to the lack of consideration for power conversion efficiency when controlling switching frequency and phase shift, particularly in low-gain and light load conditions, leading to increased switching losses.

Method used

A power conversion device with a control method that includes a ZVS detection circuit to detect non-ZVS states, and performs frequency-phase control by lowering switching frequencies and increasing phase shift amounts to maintain efficiency under varying load conditions.

Benefits of technology

The solution enhances efficiency by reducing switching losses and maintaining desired input/output voltage settings across different load conditions, thereby improving overall power conversion efficiency.

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Abstract

A power conversion device (1) comprises a first H switch (AH), a first L switch (AL), a second H switch (BH), a second L switch (BL), a resonant capacitor (Cr), a resonant inductor (Lr), a transformer (T1), and a control unit (10). A ZVS detection circuit (20) is connected in parallel with the second L switch (BL). The ZVS detection circuit (20) detects whether the second L switch (BL) is in a ZVS state, and when the same has detected that the second L switch (BL) is not in the ZVS state, the control unit (10) performs frequency phase control to reduce the switching frequencies of the first H switch (AH), the first L switch (AL), the second H switch (BH), and the second L switch (BL), and increase a phase shift quantity, which is the quantity of delay of the switching phases of the second H switch (BH) and the second L switch (BL) relative to the switching phases of the first H switch (AH) and the first L switch (AL).
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