Inter-phase current balance control system suitable for hysteresis control of high-frequency double-phase Buck converter

Abstract

The invention discloses an inter-phase current balance control system suitable for hysteresis control of a high-frequency double-phase Buck converter, which is characterized in that each phase is provided with an average inductive current detection module to obtain an average inductive current value, and then the average inductive current value of the two phases is input into a current balance module to obtain inductive current difference value information; according to the inductive current difference information, the duty ratio of the two phases is adjusted in real time through the main comparator 1 and the main comparator 2, and finally the inductive current of the two phases is balanced. According to the control system, the problem of current equalization under the high-frequency condition is solved, the inductive current detection precision is high, the current equalization effect is good, and compared with a traditional digital control method, the energy loss is low, and the occupied area is small.

Description

technical field [0001] The invention belongs to the technical field of integrated circuits, and in particular relates to a phase-to-phase current balance control system suitable for a hysteretic control high-frequency dual-phase Buck converter. Background technique [0002] A Buck converter is a DC-DC converter whose output voltage is lower than the input voltage. It is a type of switching power supply. It generally contains at least two semiconductor elements and at least one energy storage element (such as an inductor), and the output terminal is connected to a filter. ; Common Buck converter control methods include voltage mode, current mode, and hysteresis control. [0003] In recent years, the development of portable devices has put forward more requirements for Buck converters. One of the characteristics of portable devices is small size, so the power management chip inside the portable device should consider the size problem when designing. The size of passive compon...

AI Technical Summary

Problems solved by technology

[0006] In view of the above, the present invention provides a phase-to-phase current balance control system suitable for hysteretic control high-frequency two-phase Buck converters, which can work at a relatively high switching frequency, overcome various mismatch factors, and accurately measure the inductance of each phase Current, achieve equal distribution of current between phases, avoid the problem of single-phase inductance saturation caused by unbalanced current of each phase or single-phase current is too large, and compared with traditional digital control methods, the energy loss is lower and the occupied area is smaller

Images