PULSE TRANSLATION MODULATION FOR POWER CONVERTERS

摘要

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.

主权项

1. A control method 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 a switching of the switched power stage in dependence of a voltage error signal, the voltage error signal being a difference between a reference voltage and the output voltage, the method comprising:
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.