Ripple current cancellation circuit

Conference Paper · March 2003with96 Reads
DOI: 10.1109/APEC.2003.1179254 · Source: IEEE Xplore
Conference: Applied Power Electronics Conference and Exposition, 2003. APEC '03. Eighteenth Annual IEEE, Volume: 1
Abstract

A ripple current cancellation technique injects AC current into the output voltage bus of a converter that is equal and opposite to the normal converter ripple current. The output current ripple is ideally zero, leading to ultra-low noise converter output voltages. The circuit requires few additional components, no active circuits are required. Only an additional filter inductor winding, an auxiliary inductor, and small capacitor are required. The circuit utilizes leakage inductance of the modified filter inductor as all or part of the required auxiliary inductance. Ripple cancellation is independent of switching frequency, duty cycle, and other converter parameters. The circuit eliminates ripple current in both continuous conduction mode and discontinuous conduction mode. Experimental results provide better than an 80× ripple current reduction.

    • "In coupled magnetic filters ordinary inductance is replaced by a series smoothing transformer, which is a pair of coupled inductance and a blocking capacitor. In [1] a buck converter with a ripple current cancellation circuit is proposed. In this topology the circuit injects ac current into the output voltage node. "
    Full-text · Conference Paper · Mar 2016
    • "In coupled magnetic filters ordinary inductance is replaced by a series smoothing transformer, which is a pair of coupled inductance and a blocking capacitor. In [1] a buck converter with a ripple current cancellation circuit is proposed. In this topology the circuit injects ac current into the output voltage node. "
    Full-text · Conference Paper · Oct 2015
    • "This output inductor turns the dc voltage source into a current source for driving the LED load. As an alternative, this output inductor can be replaced by a current ripple cancellation circuit, which consists of a coupled inductor and a capacitor192021. This study focuses on the LED driver performance. "
    [Show abstract] [Hide abstract] ABSTRACT: This paper describes a patent-pending passive offline light-emitting diode (LED) driver that has no controlled semiconductor switches, electrolytic capacitors, auxiliary power supply, and control board. It can provide a fairly smooth current from the ac mains to drive LED strings. The new circuit has the advantages of high input power factor, high energy efficiency and luminous efficacy, long lifetime, stable luminous output, and high robustness against extreme weather conditions. In addition, over 90% of the driver material is recyclable, leading to reduction of electronic waste. It is particularly suitable public LED lighting systems, such as road lighting systems. Experimental results based on a 50-W system are included in the paper to confirm the validity of the proposal. Due to the circuit simplicity, an energy efficiency exceeding 93.6% has been achieved.
    Full-text · Article · Nov 2010 · IEEE Transactions on Power Electronics
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