PULSE TRANSLATION MODULATION FOR POWER CONVERTERS
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United States of America Patent
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Feb 20, 2015
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Feb 20, 2015
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Abstract
A control method is provided for a power converter comprising a switched power stage configured to generate an output voltage from an input voltage according to a pulsed control signal controlling switching of the switched power stage in dependence of a voltage error signal. The voltage error signal is a difference between a reference voltage and the output voltage. The method includes generating a cyclic ramp signal and generating the pulsed control signal by triggering a pulse of the pulsed control signal when a ramp of the cyclic ramp signal intersects the voltage error signal to control a pulse position. The control method provides a pulse translation technique to control charge and the inductor current in a cycle. In contrast to a modulation technique based on compensation that adjusts the duty cycle of the PWM control signal, a pulse of a nominally unaltered pulse width is just translated in time.
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