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TECHNIQUE FOR CONTROLLING INRUSH CURRENT CONTROL IN A CONVERTER

IP.com Disclosure Number: IPCOM000240470D
Publication Date: 2015-Feb-02
Document File: 2 page(s) / 60K

Publishing Venue

The IP.com Prior Art Database

Abstract

The present invention proposes a circuit for limiting inrush current. The circuit can be used in an alternating current (AC), a direct current (DC) and a compound input converter or inverter. The circuit includes a relay in series with a fuse connected to a bulk capacitor. A resistor is coupled in parallel to the fuse and the relay. The fuse blows first when capacitor shorts due to single fault and thereby protects the relay from burning, contacts from welding together and other thermal events.

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TECHNIQUE FOR CONTROLLING INRUSH CURRENT CONTROL IN A CONVERTER

BACKGROUND

The present invention relates generally to inrush current flow control and more particularly to control of inrush current flow in a converter or inverter.

Generally, inrush current control includes a relay. Usually these relays do not have a high voltage direct current (HVDC) input certification. Such a circuit suffers bulk capacitor short for single fault test. The bulk capacitor short causes smoking of relays and welding together of contacts, thereby presenting safety issues.

A conventional technique includes a circuit for controlling inrush current in an alternating current-direct current (AC-DC) power converter or inverter by providing a relay and a control circuit. Such circuit limits inrush current efficiently during cold startup, warm startup, and power line disturbance conditions. However, the relay cannot be used in a DC input system.

It would be desirable to have an efficient technique to control inrush current flow.

BRIEF DESCRIPTION OF THE FIGURES

Figure 1 depicts circuit for limiting inrush current in a converter.

DETAILED DESCRIPTION

The present invention proposes a circuit for limiting inrush current flow in a converter. The circuit described herein, may be used in an alternating current (AC), a direct current (DC) and a compound input converter or inverter. The circuit includes a relay, a fuse, a resistor and one or more capacitor. The fuse in the circuit blows first when...