Multiphase buck converter controller without PID compensator or compensated error amplifier in the control loop

摘要

A controller for a multiphase buck converter is provided having reduced delay and reduced output capacitance, in various embodiments. A multiphase buck converter including the controller is also provided. Methods of controlling a multiphase buck converter are also provided. Computers and vehicles including multiphase buck converters are also provided.

主权项

1. A controller for a multiphase buck converter, configured to control a predetermined number of power stages defining an output voltage, the controller comprising:
a voltage supply input; a control loop including a feedback voltage input configured to receive a feedback voltage proportional to output voltage; a setpoint voltage input configured to receive a setpoint voltage that represents desired output voltage, the setpoint voltage including a DC error voltage; circuitry configured to subtract the DC error voltage from the setpoint voltage to define a low voltage; a ramp generator configured to generate a periodic repeating ramp signal that ramps from the low voltage to the feedback voltage then resets to the low voltage; a phase clock coupled to the ramp generator and configured to generate a pulse each time the repeating ramp signal resets to the low voltage; a phase counter coupled to the phase clock and configured to count each time a pulse is generated by the phase clock and to restart the count when the predetermined number is reached; and a time on block having an input coupled to the phase counter and configured to turn on respective of the power stages when the counter is at predetermined count values; wherein no PID compensator or compensated error amplifier is used in the control loop between the output voltage and the feedback voltage input.