US 10,594,207 B2 · Plug-and-play ripple pacifier for DC voltage links in power electronics systems and DC power grids

Abstract

In many power electronics systems, there is an intermediate DC-link stage for facilitating the power processing of different sources to their loads. A device called a plug-and-play ripple pacifier (RP) directly plugged into the DC-link, and actively removes undesired DC-link ripple, thereby eliminating the reliance on electrolytes capacitors for stabilizing the system and remove ripple. Importantly, the use of this device is non-invasive to the operation of its host systems, and requires no modification of existing hardware. It is suitable for the protection of DC utilities/systems and can also be used as a direct replacement of ripple-canceling E-Caps in power converters device.

Claims17

Dependent claims

A power converter for stabilizing a DC-link interface to DC utilities and systems and which is connected to an AC/DC converter, comprising:

first and second capacitors Co, Cs each with first and second ends, the first capacitor being connected across a DC link;
an inductor L connected in series with a first switch S1, the series being connected between the first end of the second capacitor Cs and the DC link, a second switch S2 connected between a junction of the first switch and the inductor and the second end of the second capacitor, and a control circuit that alternately operates said first switch and second switch to control the absorption of a DC ripple by presenting a variable impedance to the DC link;
and wherein the power converter is connected to the DC-link interface without altering it so it functions as a two-port device that is plug-&-play.

Dependencies are inferred from the claim text.

Plug-and-play ripple pacifier for DC voltage links in power electronics systems and DC power grids

Life of this patent

Plug-and-play ripple pacifier for DC voltage links in power electronics systems and DC power grids

Life of this patent

Abstract

Claims17