access icon free Improved powered bus communication technique based on PD-TDMT for distributed power system (DPS)

For many distributed power systems (DPSs) such as light-emitting diode lighting and battery management, communication is essential. This study presents an improved method of integrating power transfer and communication through a common bus by applying the concept of power/data time division multiplexing transmission (PD-TDMT). The proposed method employs power electronic topologies as the basic circuits to create the power transfer system and utilises the power transmission intervals for communication. Compared with conventional communication techniques in DPS, the proposed method has the advantages of simple implementation, enhanced noise immunity and higher output power capacity. The general structure of PD-TDMT systems is presented, which includes power sourcing equipment (PSE) and powered devices (PDs). A series of PSE and PD circuits are derived based on dc–dc topologies. The timing sequence of power transfer and communication is given. To suppress the common-mode interferences under the high-power condition, a balanced power transmission system is also proposed. Besides, the termination circuits are discussed in detail under the long-distance transmission condition. Finally, the proposed method and theoretical analysis are verified by experiment.

Inspec keywords: time division multiplexing; light emitting diodes; power electronics; DC-DC power convertors

Other keywords: power transmission intervals; PD-TDMT systems; high-power condition; powered devices; common bus; power electronic topologies; DPS; conventional communication techniques; distributed power system; improved powered bus communication technique; balanced power transmission system; light-emitting diode lighting; power transfer system; higher output power capacity

Subjects: DC-DC power convertors; Power electronics, supply and supervisory circuits; Control of electric power systems; Power convertors and power supplies to apparatus; Light emitting diodes

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