Técnica de control de rápida respuesta dinámica para convertidores DC/DC integrados de alta frecuencia (5MHz)

Una frecuencia de conmutación de 5MHz permite la integración en un chip de un convertidor DC/DC de baja potencia (10W). Aunque a esta frecuencia de conmutación es posible emplear un control modo tensión con un ancho de banda de 1MHz, los efectos parásitos y la robustez del sistema no permiten esa frecuencia de ancho de banda tan elevada. En esta publicación se propone una técnica de control que optimiza la respuesta dinámica de convertidores DC/DC de elevada frecuencia de conmutación. El control propuesto y analizado se basa en el control modo corriente de pico de la corriente del condensador de salida de un convertidor reductor (Buck). El lazo de corriente del condensador de salida proporciona la rápida respuesta dinámica, ya que se comporta como un feed-forward de la corriente por la carga, mientras que el lazo de tensión proporciona regulación y exactitud en régimen permanente. Los resultados experimentales han validado la rápida respuesta dinámica del control frente a escalones de carga

Fast control technique based on peak current mode control of the output capacitor current

The control proposed and analyzed in this paper is based on the peak current mode control of the output capacitor current of a Buck converter. The output capacitor current loop provides fast dynamic response to the control since it behaves as a feed-forward of the load current while the voltage loop provides accurate steady state regulation. A simulation oriented averaged model of the proposed control has been developed to design the external voltage loop. As shown in simulations, with the converter switching at 5 MHz, the proposed control with a voltage loop of 50 kHz bandwidth has the same voltage drop and a similar dynamic response as a 1 MHz bandwidth voltage mode control. The reduction of the bandwidth makes easier the control implementation and integration. Finally, experimental results have been achieved verifying the fast dynamic response of the proposed control under load step

Fast control technique for high frequency DC/DC integrated converter based on non-invasive output capacitance current estimation

High switching frequency allows the integration of low power DC/DC converters. Although a high switching frequency would make feasible a voltage mode control with 1MHz bandwidth, parasitic effects and robustness don’t allow such a high bandwidth. This paper proposes a fast control to optimize the dynamic response of high frequency DC/DC converters. The proposed control is based on the peak current mode control of the output capacitor current. The output capacitor current loop provides fast dynamic response while the voltage loop provides accurate steady state regulation. Experimental results have validated the fast dynamic response of the proposed control under load step

Fast control technique for high frequency (5MHz) DC/DC integrated converter

A switching frequency of 5 MHz allows the integration in a chip of a low power (10W) DC/DC converter. Although this switching frequency would make feasible a voltage mode control with 1MHz bandwidth, the parasitics and robustness don't allow such a high frequency bandwidth. This paper proposes a fast control technique that helps to optimize the dynamic response of high frequency DC/DC converter. The control proposed and analyzed in this paper is based on the peak current mode control of the output capacitor current of a Buck converter. The output capacitor current loop provides fast dynamic response to the control since it behaves as a feed-forward of the load current while the voltage loop provides accurate steady state regulation. Experimental results have validated the fast dynamic response of the proposed control under load steps

V2ic Control: A Novel Control Technique with Very Fast Response under Load and Voltage Steps

High switching frequencies (several MHz) allow the integration of low power DC/DC converters. Although, in theory, a high switching frequency would make possible to implement a conventional voltage mode control with very high bandwidth, in practice, parasitic effects and robustness make very complex to achieve bandwidths higher than 1MHz. This paper proposes a fast control technique to optimize the dynamic response of high switching frequency DC/DC converters. The proposed control is based on two loops. The fast internal loop has information of the output capacitor current and the error voltage, providing fast dynamic response under load and output voltage reference steps, while the slow external voltage loop provides accurate steady state regulation. Experimental results validate the fast dynamic response of the proposed control under load and output voltage reference steps and its suitability for high switching frequencies