Single-inductance double-output switch power supply based on ripple control

Abstract

A single-inductor dual-output switch power supply based on ripple control, comprising a power stage module (1), a filtering and voltage sampling module (2), a secondary voltage sampling module (3), a secondary ripple control module (4), a primary voltage sampling module (5), a primary control module (6) and a drive module (7). The output of the power stage module (1) is connected to the filtering and voltage sampling module (2), the output of the filtering and voltage sampling module (2) is connected to the secondary voltage sampling module (3) and primary voltage sampling module (5) respectively, the output of the secondary voltage sampling module (3) is connected to the secondary ripple control module (4), the primary voltage sampling module (5) is connected to the primary control module (6), the outputs of the secondary ripple control module (4) and the primary control module (6) are both connected to the drive module (7), the output of the drive module (7) is connected to the power stage module (1), and the secondary ripple control module (4) also outputs a slope compensation current source (Islope) signal to the secondary voltage sampling module (3).

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a single-inductance multi-output switching power supply based on ripple control. Background technique [0002] Many electronic devices need to provide multiple independent power sources, and these electronic devices require efficient power management systems. Single-inductor multiple-output (SIMO) step-down DC-DC converters have become a hot topic in academia and industry because they can reduce the use of off-chip components (especially off-chip inductors) and thus reduce the size of power modules. and development direction. Although it can reduce the size of the power module, it also has the problems of large output ripple, low efficiency and cross modulation. For SIMO in practical applications, small ripple, low cross-coupling, high efficiency and fast transient response are the indicators that need the most attention. The existing technology adopts the common-mode v...

Images