Variable input power control for reducing ac-dc converter input capacitance

By employing a variable input power control method in the USB-PD power adapter, the input power is dynamically adjusted to reduce capacitor requirements, thus solving the problem of input capacitor limiting power density and achieving a reduction in converter size and cost.

CN122743645APending Publication Date: 2026-09-11DIGITAL COOL POWER CO LTD
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Patent Information

Application Number
CN202480087034.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2024-02-09
Filing Date
2024-03-21
Publication Date
2026-09-11

AI Technical Summary

Technical Problem

In existing USB-PD power adapters, the size of the input capacitor Cin is a limiting factor for power density. Traditional constant input power control makes it difficult to reduce the capacitor value, resulting in higher converter size and cost.

Method used

The variable input power (VIP) control method is adopted to reduce the capacitor demand by redistributing the capacitor value within half a cycle of AC power frequency and dynamically adjusting the input power according to the input voltage change.

Benefits of technology

It effectively reduces the input capacitance value, increases the system power density, reduces the size and cost of the converter, and improves the conversion efficiency.

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Abstract

A variable input power (VIP) control method is presented that is capable of reducing the capacitance value of the input capacitor. By reducing the capacitance value of the input capacitor, both a smaller input capacitor Cin can be used and the system performance can be improved at a given capacitance value, thus increasing the available power density of the system. In essence, the VIP control technique is used to redistribute the output power Pin over the AC half-cycle period. Thus, during the charging phase, the discharge power of Cin is significantly reduced compared to the output power Pin, thus reducing the required Cin.
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