Indirect Synchronization Phenomenon on Self-Oscillating Current Controllers

Abstract

In this paper, a particular phenomenon called indirect synchronization is investigated on self-oscillating current controllers based on a hysteresis controller and a recent relayfeedback controller without hysteresis. The main effect of this indirect synchronization is a modification of regulation behavior when the system works in high frequency. This study is thus particularly useful for applications such as active filtering or high precision power supply, where the signals to target can be close to the fifth of the switching frequency. Simulation results highlight this indirect synchronization phenomenon and thus show relevance to take it into account for high accuracy applications.

Techno-economic optimization of a supercapacitor-based energy storage unit chain: Application on the first quick charge plug-in ferry

“…Using Eqs. (34) and (35) in Eq. (41), the cost of the inductance can be expressed with the stored magnetic energy:…”

“…With the core volume V core given by Eq. (35) and assuming that the magnetic circuit is not saturated, the core losses P core are given by:…”

“…With a constant switching frequency f sw and an inductor value L, the peak-to-peak current ripple Di l is given by [35]: Finally, the rated current I rated of the IGBT converter is calculated considering a full trip of the ship and defined by:…”

Modified projected cross point control — a large signal analysis

“…Hysteresis current-mode control (HCMC) is one of the most popular variable-frequency approaches. Its principle of operation is discussed in [6][7][8][9][10]. HCMC has several advantages including: 1) no slope compensation required for duty ratios above 50%, 2) simple stable loop design, 3) no sub-harmonic oscillations, and 4) constant peak-to-average inductor current offset.…”

Modified projected cross point control — a small signal analysis

“…This method has several advantages including: 1) no slope compensation required for D above 50%, 2) easy loop-stability design, 3) no subharmonic oscillations, and 4) constant peak-to-average inductor current ratio. However, due to its variable frequency operation, HCMC is not suitable for any applications that require the switching frequency to be synchronized with an external clock [8][9][10][11][12][13].…”