This paper investigates a mixed signal voltage- mode controller for dc-dc converters based on hysteresis modulation. Both switch turn-on and switch turn-off instants are determined asynchronously through comparison of the converter output voltage with a voltage ramp driven by the digital controller and generated through digital-to-analog conversion (DAC). With respect to a previously reported mixed-signal solution, the implementation proposed here generates different slope voltage ramps during the switch-on and switch-off phases and it fully approximates the dynamic capabilities of a multi-loop control with an internal hysteresis current control based on the estimated inductor current. Simulation and experimental results on a synchronous buck converter are also reported.
Analysis of a Mixed-Signal Voltage-Mode Control for dc-dc Converters based on hysteresis modulation
SAGGINI S;
2007-01-01
Abstract
This paper investigates a mixed signal voltage- mode controller for dc-dc converters based on hysteresis modulation. Both switch turn-on and switch turn-off instants are determined asynchronously through comparison of the converter output voltage with a voltage ramp driven by the digital controller and generated through digital-to-analog conversion (DAC). With respect to a previously reported mixed-signal solution, the implementation proposed here generates different slope voltage ramps during the switch-on and switch-off phases and it fully approximates the dynamic capabilities of a multi-loop control with an internal hysteresis current control based on the estimated inductor current. Simulation and experimental results on a synchronous buck converter are also reported.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.