Multi-mode control method and device

Abstract

The application discloses a multi-mode control method and device. The multi-mode control method comprises the following steps of: determining the current working mode of a controlled circuit; presetting multiple working modes for the controlled circuit, dividing operation areas in different working modes by adopting performance optimization of the controlled circuit as an objective, and determining the condition for switching among the different working modes according to boundary values of all the operation areas; determining the current operation state of the controlled circuit; judging whether the controlled circuit meets the condition for switching from the current working mode to another working mode according to the current operation state of the controlled circuit; and if so, controlling the controlled circuit to switch from the current working mode to another working mode so as to improve the adaptability of power electronic circuits to complex application occasions.

Description

technical field [0001] The present invention relates to the technical field of power electronics, and more specifically, to a multi-mode control method and device. Background technique [0002] With the complexity of the application of power electronics technology, the traditional working mode of some power electronics circuits can no longer meet the current work requirements. [0003] For example, the topology of a full-bridge Buck-Boost circuit is as follows figure 1 As shown, it can be regarded as the cascade connection of the Buck half bridge and the Boost half bridge. Specifically: S1 and S2 are the upper and lower tubes of the Buck half bridge, S4 and S3 are the upper and lower tubes of the Boost half bridge, and L1 is the common inductance of the two bridge halves. The full-bridge Buck-Boost circuit usually works in the mode where the upper and lower transistors of the same half bridge are turned on alternately, and the upper and lower transistors of different half ...

AI Technical Summary

Problems solved by technology

This working mode is very simple, but it is based on the fact that the inductor L1 first stores energy and then releases energy in each switching cycle. The ripple current of the inductor is very large, resulting in excessive core loss and conduction loss. , and the filtering pressure is also greater

In addition, because S1 ~ S4 are switched once every cycle, it also causes a large switching loss

It can be seen that the operation of the full-bridge Buck-Boost circuit in this traditional working mode will cause low efficiency and cannot meet the working requirements of occasions that require high circuit efficiency.

Images