Method for centralized voltage control and current balancing for parallel operation of power supply equipment

Static and dynamic analysis of paralleled dc-to-dc converter system with averaged current-balancing controllers

“…To suppress this unbalance, a current-balancing circuit is added. Proposed current-balancing control methods include the masterslave system [1,2] in which a specific module is used as the master while other modules are centrally controlled, the maximum current follower system [35] in which the module with the maximum current is used as the master which is dynamically chosen, and the average current-balancing system [6,7] in which the output current from each module is made to follow the average current of all modules. Of these, the average current-balancing method is widely used since a highly reliable parallel redundant system can be constructed with a simple controller circuit.…”

“…Of these, the average current-balancing method is widely used since a highly reliable parallel redundant system can be constructed with a simple controller circuit. The authors have reported experimental and simulation results [7], an analysis of the static characteristics [8], and studied the stability [9] in regard to the average current-balancing control system. A systematic and quantitative analysis of the static and dynamic characteristics of the current balancing properties has not been carried out sufficiently in the case where the circuit parameters of each module are different.…”

Single-wire current-share paralleling of current-mode-controlled DC power supplies

“…In this way, the current stress of the switching devices is reduced and the efficiency and reliability [1] are improved. About the current-sharing control, a variety of schemes have been presented [2]- [10] over the years. The single-wire current-share method [7] is comparatively simple and, hence, favorable.…”

Parallel operation of modular power factor correction circuits

“…(2) and (5) into Eq. (6) yields (7) The average dc current over one half of the line frequency cycle is Then, at steady state, the dc output power can be obtained as: (9) Eq. (9) indicates that K should be adjusted in accordance with the operating output power and input voltage.…”