Step-up/step-down voltage converter having low output ripple

摘要

A voltage converter device converts an input signal having a given input voltage value into an output signal having an output voltage different from the input voltage. The device comprises a main module, arranged between an input terminal and a first circuit node, The device is adapted to output at the first circuit node a pulse-width-modulated signal switching between a first voltage value and a second voltage value, defining a switching range, by switching successively between a first mode of operation and a second mode of operation. The switching range of the pulse width modulation has an amplitude, calculated as the absolute difference between the first and the second voltage value, inferior or equal to half the input voltage.

主权项

1. A device for converting an input signal having a given input voltage into an output signal having an output voltage different from the input voltage, the device comprising:
an input terminal adapted to receive the input signal; an output terminal coupled to a first circuit node and adapted to output the output signal converted from the input signal, wherein the output signal voltage is within one of two or more switching ranges defined by configurations of capacitors in a main module, and wherein the value of the output signal voltage within each switching range is defined by a duty cycle of a pulse-width-modulated (PWM) signal generated by the main module; the main module disposed operatively between the input terminal and the first circuit node, the main module adapted to output, at the first circuit node, a PWM signal by operating in at least two modes of operation with a given duty cycle, the PWM signal switching with a switching frequency between at least a first voltage value and at least a second voltage value, the first and second voltage values defining one of the at least two switching ranges; wherein the main module, in a first mode of operation is:
coupled to the input terminal so as to store power from the input signal;configured to output the first voltage value to the first circuit node; wherein the main module, in a second mode of operation is configured to output the second voltage value different from the first voltage value to the first circuit node by using power stored during the first mode of operation; wherein the switching range of the PWM signal has an amplitude, calculated as a difference between the first and second voltage values, less than or equal to half the input voltage.