Multiphase series capacitor DC-DC converter and control method

Abstract

A multi-phase series capacitor direct current-direct current converter comprises a power level circuit used for converting input direct current voltage into stable direct current voltage needed by a load, wherein the power level circuit at least comprises two phases of inductors, phase differences with preset intervals exist between currents of the two phases of inductors, the power level circuit is used for sequentially and alternately charging the load, a two-way switch is arranged between every two adjacent phase inductors, and when the two-way switches are switched on, the corresponding two-phase inductors charge the load at the same time; and a load transient response circuit which is used for controlling at least one bidirectional switch to be switched on when transient forward jump of the load occurs, so that at least two-phase inductors charge the load at the same time to quickly respond to transient change of the load. The invention further provides a control method of the converter, and quick response to transient change of the load can be realized.

Description

technical field [0001] The present disclosure relates to the field of electronic technology, in particular to a multi-phase series capacitor DC-DC converter and a control method. Background technique [0002] Existing multi-phase series capacitor DC-DC converters are usually optimized for the control loop to improve the load transient response speed, but the load transient response speed is still limited by the rising slope of the inductor current. The traditional transient enhancement technology increases the rising slope of the inductor current by increasing the switching frequency. However, the increase in the switching frequency further compresses the conduction time of the power transistor, which poses a very high challenge to the design of the control and drive circuits; the increase in the switching frequency greatly increases the The switching loss of the power tube deteriorates the conversion efficiency. In order to avoid overlapping conduction times of multi-phase...

AI Technical Summary

Problems solved by technology

The traditional transient enhancement technology increases the rising slope of the inductor current by increasing the switching frequency. However, the increase in the switching frequency further compresses the conduction time of the power transistor, which poses a very high challenge to the design of the control and drive circuits; the increase in the switching frequency greatly increases the The switching loss of the power tube deteriorates the conversion efficiency

In order to avoid overlapping conduction times of multi-phase power tubes, the power tube control signals need to maintain a fixed phase difference of 360° / N, and the N-phase inductor current cannot be used to charge the load at the same time, and the load transient response speed is limited.

Images