ELETRONIC CIRCUIT WITH A CURRENT RIPPLE FILTER

• US 20150061411A1
• Filed: 04/10/2012
• Published: 03/05/2015
• Est. Priority Date: 04/10/2012
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Jorgen Olsson
• Inventors: Appelberg, Mikael, Olsson, Jrgen, Svensson, Martin
• Granted Patent: US 9,971,315 B2
• Time in Patent Office: Days
• US Class Current: 307/131
• CPC Class Codes: G05B 9/02 electric
• CPC Class Codes: H02J 1/02 Arrangements for reducing harmonics or ripples
• CPC Class Codes: H02J 3/01 Arrangements for reducing harmonics or ripples
• CPC Class Codes: H02M 1/15 using active elements
• CPC Class Codes: H03G 1/00 Details of arrangements for controlling amplification
• CPC Class Codes: H03H 7/0107 Non-linear filters
• CPC Class Codes: Y02E 40/40 Arrangements for reducing harmonics

Abstract

An electronic circuit comprising an ACRF comprising an active component, an energy storage unit, an input port and an output port. The electronic circuit comprises a control unit to control the ACRF. A detector detects a short circuit at the input port or the absence of an energy supply at the input port. The control unit controls the ACRF to function as an ACRF if the detector detects a power supply connected to the input port or that there is no short circuit at the input port, and controls the ACRF to stop functioning as an ACRF and to discharge energy from its energy storage unit to its output port if the detector detects a short circuit at the input port or no power supply connected to the input port.

Claims

1. An electronic circuit comprising an active current ripple filter, ACRF, the ACRF comprising one or more active components and an energy storage unit, the ACRF also comprising an input port and an output port, the electronic circuit also comprising a control unit connected to and arranged for the control of the ACRF, the electronic circuit further comprising a first detector connected to the control unit and arranged to detect a short circuit at the ACRF'"'"'s input port or the absence of an energy supply at the ACRF'"'"'s input port, the control unit being arranged to control the ACRF to function as an ACRF if the first detector detects that there is a power supply connected to the ACRF'"'"'s input port or that there is no short circuit at the ACRF'"'"'s input port, the control unit being arranged to control the ACRF to stop functioning as an ACRF and to discharge energy from its energy storage unit to its output port if the first detector detects that there is a short circuit at the ACRF'"'"'s input port or that there is no power supply connected to the ACRF'"'"'s input port.

2. The electronic circuit of claim 1, further comprising a second detector for measuring an amplitude of a current at the ACRF'"'"'s input port, said second detector being connected to the control unit, the control unit being arranged to control the level of a current at the ACRF'"'"'s output port based on the measurements from the second detector when the ACRF is controlled to function as an ACRF.