A Dynamic Response Improvement at Changeover Control of Digitally Controlled DC-DC Converter

Masahiro SASAKI  Hirofumi MATSUO  Fujio KUROKAWA  Yasuhiro MIMURA 

Publication
B - Abstracts of IEICE TRANSACTIONS on Communications (Japanese Edition)  Vol.J90-B  No.8  pp.734-740
Publication Date: 2007/08/01
Online ISSN: 1881-0209
Print ISSN: 1344-4697
Type of Manuscript: PAPER
Category: 
Keyword: 
DC-DC converter,  digital control,  digital control IC,  VCO,  dynamic characteristics, 

Full Text(in Japanese): PDF(936.1KB)

Summary: 
This paper presents the steady state at changeover control with the change of the load in the digitally controlled system that has the constant voltage control, the constant current control and the constant power control. The constant voltage control mode and the constant current control mode have different control system each other. Therefore, in the constant current control mode, when the bit number of the integral circuit increase extremely to extend the regulation range of the output voltage, the constant voltage circuit doesn't work is saturated. In this case, if the control system is changed, the output voltage error is happened with the overcurrent and the overvoltage. This paper presents a new circuit that requires high speed response and explain the performance characteristics and the mechanism of the response improvement. It proposes the circuit that has regular interval NB so as not to interfere in the operation of the integration circuit mutually as a method of settlement and installs the limitation, and the characteristic is shown. As a result, it was ameliorable from the state that the time settled from the state that was 59 V to the ratings 54.6 V to 55 V within the range of the voltage accuracy was not able to be measured to 0.2 ms at time of the switch dividing from the current control to the armature voltage control. Moreover, the time from the electric power control to the armature voltage control settled from the voltage change 57.5 V to 56 V within the range of the voltage accuracy when switching and putting it comparatively was able to be shortened from 2.5 ms to 0.7 ms.