Conference Paper

Ripple current cancellation circuit

GE Global Res. Center, Niskayuna, NY, USA
DOI: 10.1109/APEC.2003.1179254 Conference: Applied Power Electronics Conference and Exposition, 2003. APEC '03. Eighteenth Annual IEEE, Volume: 1
Source: IEEE Xplore

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.

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    • "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 capacitor [19] [20] [21]. This study focuses on the LED driver performance. "
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    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.
    IEEE Transactions on Power Electronics 11/2010; DOI:10.1109/TPEL.2010.2048436 · 5.73 Impact Factor
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    • "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 capacitor [19] [20] [21]. This study focuses on the LED driver performance. "
    [Show abstract] [Hide abstract]
    ABSTRACT: This paper describes a patent-pending passive offline LED driver that has no 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 50W 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.
    Applied Power Electronics Conference and Exposition (APEC), 2010 Twenty-Fifth Annual IEEE; 03/2010
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    • "Por ello se considera el convertidor con cancelación de rizado una mejor opción para esta aplicación, en términos de peso y pérdidas, a pesar de incrementarse el número total de componentes y la complejidad del diseño. Como L 3 es pequeña, podría substituirse por la inductancia de dispersión del elemento magnético principal [11], reduciendo el número de magnéticos y por lo tanto el coste y el peso del convertidor. "
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    ABSTRACT: La topología elevadora con cancelación de rizado permite atenuar el rizado de la corriente de salida y de entrada, lo que implica la supresión del filtro de entrada y una reducción del filtro de salida. Sin embargo, para conseguir la cancelación de rizado se incrementa la complejidad y el número de componentes, por lo que se ha realizado un análisis detallado para concretar las ventajas e inconvenientes de esta topología. Este artículo presenta el análisis dinámico de la topología, para lo cual se ha obtenido el modelo promediado de la misma, así como su compleja función de transferencia, de orden siete. Dada esta complejidad se presenta una función de transferencia simplificada, de segundo orden, que permite simplificar el diseño de la etapa de control. Se ha realizado una comparación entre la topología analizada y un elevador convencional en términos de peso, pérdidas y rizado de corriente de entrada, utilizando el modelo promediado para estimar dicho rizado en la topología analizada. Para validar la cancelación de rizado y el análisis dinámico de la topología se ha construido un prototipo, adjuntándose las formas de onda y el diagrama de bode medido, validándose la cancelación de rizado a la entrada y la salida del convertidor, para los dos modos de conducción.
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