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Boost converter with load dependent adaptive controller for improved transient response

  • Size and cost of a boost converter can be minimized by reducing the voltage overshoot and fastening the transient response in case of load transient. The presented technique improves the transient response of a current mode controlled boost converter, which usually suffers from bandwidth limitation because of its right-half-plane zero (RHPZ). The proposed technique comprises a load current estimation which works as part of a digital controller without any additional measurements. Based on the latest load estimation the controller parameters are adapted, achieving small voltage overshoot and fast transient response. The presented technique was implemented in a digital control circuit, consisting of an ASIC in a 110 nm-technology, a Xilinx Spartan-6 field programmable gate array (FPGA), and a TI-ADS8422 analog to-digital-converter (ADC). Simulation and measurements of a 4V-to-6.3V, 500mA boost converter show an improvement of 50% in voltage overshoot and response time to load transient.

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Author of HS ReutlingenQuenzer-Hohmuth, Samuel; Wicht, Bernhard
Erschienen in:12th Conference on Ph.D. Research in Microelectronics and Electronics (PRIME) : 27 - 30 June 2016, Lisbon, Portugal
Place of publication:Piscataway, NJ
Document Type:Conference proceeding
Publication year:2016
Page Number:4
DDC classes:620 Ingenieurwissenschaften und Maschinenbau
Open access?:Nein
Licence (German):License Logo  In Copyright - Urheberrechtlich geschützt