Acoustic noise reduction in a dc-dc converter using variable frequency modulation

A controller and capacitor technology, used in output power conversion devices, conversion of DC power input to DC power output, instruments, etc.

Pending Publication Date: 2019-10-25
RENESAS ELECTRONICS AMERICA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

While SC-based DC-DC converters may thus offer certain benefits over inductor-based topologies, certain opportunities for improvement still exist

Method used

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  • Acoustic noise reduction in a dc-dc converter using variable frequency modulation
  • Acoustic noise reduction in a dc-dc converter using variable frequency modulation
  • Acoustic noise reduction in a dc-dc converter using variable frequency modulation

Examples

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Embodiment Construction

[0018] Embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which are provided as illustrative examples of the embodiments to enable those skilled in the art to practice embodiments and alternatives that will be apparent to those skilled in the art. It is worth noting that the following figures and examples are not meant to limit the scope of the present embodiments to a single embodiment, and other embodiments are possible by interchanging some or all of the described or illustrated elements. Also, in the case where some elements of the present embodiment can be partially or completely realized using known components, only those parts of the known components necessary for understanding the present embodiment will be described, and other references to the known components will be omitted. Some detailed descriptions are given so as not to obscure the present embodiments. Embodiments described as implemented in softwar...

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Abstract

The present embodiments relate generally to switched-capacitor (SC) based DC-DC converters, and more particularly to modulation schemes of cap dividers that include ceramic capacitors such as MLCCs. According to certain general aspects, the present embodiments increase the switching frequency at light loads using variable frequency modulation schemes to reduce the voltage difference across the MLCCs. In these and other embodiments, the acoustic noise generated from the MLCCs can be reduced while maintaining excellent light load efficiency. According to certain aspects, this can be achieved with minimal impact on system performance, cost and size.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Patent Application No. 62 / 656,650, filed April 12, 2018, the contents of which are incorporated herein by reference in their entirety. technical field [0003] This embodiment relates generally to switched capacitor (SC) based DC-DC converters, and more particularly to modulation schemes employing a ladder topology and hat dividers comprising ceramic capacitors. Background technique [0004] A DC-DC converter receives an input voltage from an input source (eg, mains power, battery, etc.) and uses that voltage to provide an output voltage to a load (eg, computer, IoT device, etc.). Conventional DC-DC converters often employ topologies that include inductors and power switches such as power MOSFETs. Such inductor-based topologies have issues and / or they have certain design considerations that are not usually easy to address. [0005] An alternative to the inductor ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158H02M1/44
CPCH02M1/44H02M3/158
Inventor 燕模·陈斌·李梅裕尔·迪利普·沙阿国坤·林
Owner RENESAS ELECTRONICS AMERICA
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