Power packet dispatching with features on safety

Abstract

This paper investigates and proposes one advantageous function of a power packet dispatching system, which has been proposed by authors' group with being apart from the conventional power distribution system. Here is focused on the feature on safety of power packet dispatching which covers two aspects: information safety (protect the information of packet from attackers) and power safety (keep loads safe regarding supplied power from packet). For the purpose of achieving the information safety and the power safety, we introduce simple modulations of power packets before sending them. In particular, in order to protect the information of packets, partial packet modulation is proposed first, i.e., modulating partial information tags of packets. Modulation scheme based on chaotic signal is one possibility for this purpose and we adopt the differential chaos shift keying (DCSK) scheme in this paper. Next, the power safety can be achieved by applying pulse width modulation (PWM) to the payload of packets. Meanwhile, considering the effect of the noise on the packet dispatching, further modulation of the payload using the DCSK scheme is proposed, which can spread the spectrum of the noise. Consequently, we introduce the concept of whole packet modulation, in which PWM is applied to the payload of packets first, and then modulation using the DCSK scheme is applied throughout the whole packet. In this manner, both the information safety and the power safety can be achieved and the spectrum of noise is spread as well. Additionally, it is worth mentioning that the rigorous examination of the modulation method is not the target in this moment.

Up-Stream Dispatching of Power by Density of Power Packet

“…Finally, we briefly discuss the case e i < v for some i ∈ I. During e i < v, no power is transferred by packet i, because the diode at link i prevents reverse instantaneous power [11]. Therefore, the effect of the diodes should be taken into account by using power density at port i † † instead † In the whole network, the base value of voltage may be different depending on the varieties of power identified by tags and storages [9].…”

“…Recently, widebandgap power semiconductor devices, which have the potential to realize higher frequency switching and higher power capacity than Si power devices, have been developed [6], [7]. The authors' group has developed a power packet dispatching system in physical layer applying these highperformance power semiconductor devices [8]- [11]. In the system, power packets are directly and physically tagged as their voltage waveforms.…”

Design possibility for covert power packet transfer using asynchronous sampling

“…Until now, the security and the safety of power packetization has been discussed [9]. In [9], referring to communication systems, information tags are modulated with the differential chaos shift keying (DCSK) scheme in order to enhance the security of information tags.…”

“…In [9], referring to communication systems, information tags are modulated with the differential chaos shift keying (DCSK) scheme in order to enhance the security of information tags. In addition, they also proposed to modulate a whole packet, namely both the information tag and the power pulse, using the DCSK scheme.…”

Trajectory control of manipulator fed by power packets

“…As an application of the power packet dispatching to independent systems, we have studied the possibility of the motion control by power packets . In the power packet dispatching system, the amount of transferred power can be estimated by the number of packets supplied in a given time period . In other words, the power supply is discretized by an intermittent supply of power pulses.…”