Nonlinear digital control circuit and method for a DC/DC converter

摘要

The control circuit for a DC/DC converter (11) has a linear-control loop (12, 14, 15), which receives a quantity to be controlled (V0) and a first reference quantity (Vr1), and generates a modulation value (DC1). A nonlinear modulation unit (13, 18-21) is activated in presence of a variation of the quantity to be controlled (V0) higher than a preset intervention threshold (Vth1) and modifies in a nonlinear way the reference quantity supplied to the linear-control loop. In the case of large variation and of preset sign of the quantity to be controlled, the linear-control loop is deactivated, a signal for switching-off of the DC/DC converter (11) is initially generated, and then a false steady-state-modulation value (DC2) is supplied to the DC/DC converter.