Power supply circuit for an electrical energy storage unit

The power supply circuit for electrical energy storage units increases power transmission by modulating the input voltage to create a square current waveform, addressing the limitations of existing systems by doubling the transmitted power without elevating magnetic and electric field levels.

WO2024261196A1PCT designated stage expired Publication Date: 2024-12-26VALEO EAUTOMOTIVE GERMANY GMBH
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Patent Information

Application Number
PCT/EP2024/067357
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-06-22
Filing Date
2024-06-20
Publication Date
2024-12-26

AI Technical Summary

Technical Problem

Current contactless power supply systems for electrical energy storage units, such as electric vehicle batteries, are limited by maximum magnetic and electric field levels, restricting the maximum power that can be transmitted through inductive coupling without increasing these field values.

Method used

A power supply circuit that includes a control unit, a primary inductive cell, and a secondary circuit with N branches in parallel, each comprising a capacitor and inductance in series, configured to resonate at specific harmonics of the input voltage, allowing for the modulation of the input voltage to create a square-shaped current waveform, thereby doubling the transmitted power without increasing magnetic and electric field levels.

Benefits of technology

The solution effectively doubles the maximum power transmission through inductive coupling by converting the sinusoidal current waveform to a square shape, enhancing the effective current value and thus the transmitted power without increasing magnetic and electric field levels.

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Abstract

The invention relates to a power supply circuit (1) for an electrical energy storage unit (2), this power supply circuit comprising: - a control unit (3); - a primary circuit (4) comprising a primary inductive cell that receives an input voltage Vin; - a secondary circuit (6) capable of being connected to an electrical energy storage unit (2), comprising a secondary inductive cell that is connected, on the one hand, to a sub-circuit (8) consisting of N parallel branches each comprising a capacitor having a capacitance Ci and an inductor Li in series, where 1 ≤ i ≤ N, and, on the other hand, to an impedance-matching device (14), wherein the primary circuit (4) and the secondary circuit (6) are configured so as to exchange electrical energy contactlessly through inductive coupling with a coupling coefficient k, at the fundamental frequency F1 of the AC voltage at the input of the primary circuit (4), the AC voltage Vin at the input of the primary inductive cell is modulated by the control unit (3) in order to exhibit N harmonics, where N ≥ 2, and the pairs Ci, Li of the sub-circuit (8) are configured to resonate at the frequency F2i-1 with F2i-1 = (2i-1)*F1.
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Citation Information

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