Digitally controlled buck-boost regulator having a custom mapping controller

摘要

A digitally controlled buck boost regulator includes an H-bridge circuit including a plurality of switches configured to receive an input voltage signal and generate an output voltage signal based on the input voltage signal and switching signals provided thereto. A controller generates a pulse width modulation (PWM) control value in response to a value of the output voltage signal, and a quantizer/mapper receives the PWM control value and provides a first mapping to a mapped PWM control value if the PWM control value is outside a predetermined range of PWM control values, and generates a second mapping to a mapped PWM control value if the PWM control value is within the predetermined range. A digital pulse width modulator is configured to generate switching signals based on the mapped PWM control value, and provide the generated switching signals to the H-bridge circuit.

主权项

1. A digitally controlled regulator, comprising:
a DC-DC converter circuit configured to receive an input voltage signal and generate an output voltage signal based on the input voltage signal and switching signals provided thereto; a controller configured to generate a pulse width modulation (PWM) control value in response to a value of the output voltage signal; a quantizer configured to receive the PWM control value and generate a first mapping that maps all the PWM control values that fall between a first threshold value and a second threshold value to a first single mapped PWM value, and generate a second, different mapping that passes the received PWM control values that are less than a third threshold value or greater than a fourth threshold value as mapped PWM values in a one-to-one correspondence fashion, wherein the first threshold value is less than the second threshold value, the third threshold value is less than the first threshold value and the fourth threshold value is greater than the second threshold value; and a digital pulse width modulator configured to generate switching signals based on the mapped PWM value, and provide the generated switching signals to the DC-DC converter circuit.