TY - GEN
T1 - DSP-based control of multi-rail DC-DC converter systems with non-integer switching frequency ratios
AU - Mooney, James
AU - Effler, Simon
AU - Halton, Mark
AU - Mahdi, Abdulhussain E.
PY - 2010
Y1 - 2010
N2 - This paper examines the use of non-integer switching frequency ratios in digitally controlled DC-DC converters. In particular the execution of multiple control algorithms using a Digital Signal Processor (DSP) for this application is analyzed. The variation in delay from when the Analog to Digital Converter (ADC) samples the output voltage to when the duty cycle is updated is identified as a critical factor to be considered when implementing the digital control system. Fixing the delay to its maximum value is found to produce reasonable performance using a conventional DSP. A modification of the DSP's interrupt control logic is proposed here that minimizes the delay and thereby yields improved performance compared with that given by a standard interrupt controller. Applying this technique to a multi-rail power supply system provides the designer with the flexibility to choose arbitrary switching frequencies for individual converters, thereby allowing optimization of the efficiency and performance of the individual converters.
AB - This paper examines the use of non-integer switching frequency ratios in digitally controlled DC-DC converters. In particular the execution of multiple control algorithms using a Digital Signal Processor (DSP) for this application is analyzed. The variation in delay from when the Analog to Digital Converter (ADC) samples the output voltage to when the duty cycle is updated is identified as a critical factor to be considered when implementing the digital control system. Fixing the delay to its maximum value is found to produce reasonable performance using a conventional DSP. A modification of the DSP's interrupt control logic is proposed here that minimizes the delay and thereby yields improved performance compared with that given by a standard interrupt controller. Applying this technique to a multi-rail power supply system provides the designer with the flexibility to choose arbitrary switching frequencies for individual converters, thereby allowing optimization of the efficiency and performance of the individual converters.
UR - http://www.scopus.com/inward/record.url?scp=79957989770&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:79957989770
SN - 9780956833006
T3 - EPC-IQ01 2010 - 2010 1st International Conference on Energy, Power and Control
SP - 203
EP - 207
BT - EPC-IQ01 2010 - 2010 1st International Conference on Energy, Power and Control
T2 - 2010 1st International Conference on Energy, Power and Control, EPC-IQ01 2010
Y2 - 30 November 2010 through 2 December 2010
ER -