Power conversion circuit, semiconductor device, and electronic device

By incorporating a primary capacitor and inductor in the power conversion circuit and controlling the periodic operation of the switching elements, the problem of input impedance matching with output impedance is solved, power conversion efficiency is improved and power consumption is reduced. This method is suitable for environmental power generation devices such as vibration power generation, solar cells, and wind power generation.

CN115668731BActive Publication Date: 2026-07-07THE JAPAN SCI & TECH AGENCY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
THE JAPAN SCI & TECH AGENCY
Filing Date
2021-05-26
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

In environmental power generation devices, the constant changes in input current make it difficult to match the input impedance of the power conversion circuit with the output impedance, resulting in reduced power conversion efficiency. This is especially true when using organic piezoelectric elements or MEMS elements, where the inductance and capacitance range of the primary capacitor are unknown, and high switching frequencies increase power consumption.

Method used

By adopting a power conversion circuit structure and setting a primary capacitor and an inductor, the switching cycle of the switching elements is controlled to ensure that the current flowing in the inductor accumulates magnetic field energy within a constant period, thereby inducing the current in the capacitor. This achieves autonomous matching between the input impedance and the output impedance, reducing power consumption.

Benefits of technology

It improves power conversion efficiency, reduces voltage fluctuations, lowers power consumption, and achieves stable power conversion under different input current conditions.

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Abstract

The power conversion circuit has a first capacitor having one end connected to an input terminal and the other end connected to a reference potential, a second capacitor having one end connected to an output terminal and the other end connected to the reference potential, an inductor having one end connected to one end of the first capacitor and the other end connected to one end or the other end of the second capacitor, in which magnetic field energy is accumulated by at least a part of an input current and a current output from the first capacitor as a first current, the inductor induces a second current that charges the second capacitor by means of the magnetic field energy, and a switching element that is turned on and off at a substantially constant period, the period during which the switching element is turned on is substantially constant during one period, the first current flows in the inductor by the switching element being turned on, and the switching element is turned off when the second current flows in the inductor.
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