The Study On Loss-free Resistor

Resistance devices have wide applications in practical circuits, such as electronic circuits in electrical appliances, motor control system, industrial control system, robot manipulate circuit, and other electric apparatuses. Resistance devices are greatly needed to meet the required characteristics of the systems. They can be applied to the stabilization of unstable systems for damping oscillatory waveforms, and can also be used to as speed control device. It can be safely said that resistors are almost everywhere in circuit systems. Conventional resistors can be regarded as electricity-heat converter for they consume the energy absorbed by resistors as heat. This behavior depicts the characteristic of the conventional resistor, but it is not necessary for a resistor.This energy convert mode lowers the efficiency of systems, results in great energy losses, increases in high temperature for the emanatory energy, and even shortens the longevity of the apparatus. The conception of loss-free resistance was brought forward for these reasons. Loss-free resistance is a two-port network with a resistive characteristic which transfers all the absorbed power to the output terminal.This paper analyses the topologies of LFR and how to realize a LFR based on loss-free two-port network, presents a new method to realize a gyrator and a LFR founded on loss-less transmission line, and proves the feasibility of this method by simulation. This kind of LFR really has a great value in applications.The main work of this paper is shown in detail as follows:Chapter 1 introduces the background, significance, work and innovation of the paper.Chapter 2 mainly introduces the already realized LFR.Chapter 3 researches on how to set models of loss-free two-port network, sets up the models of time-variable transformer and time-variable gyrator, realizes mutual transformation by proper control, and summarizes the abstracted circuit models from practical circuits.Chapter 4 analyses the characteristic of loss-less transmission line, brings forward a new way to realize time-variable gyrator based onλ4 transmission line through theoretic deduction. Meanwhile, this chapter puts forward a new type of LFR founded on the loss-less transmission line in order to absorb the energy trapped in the plasma tube of the laser, thoroughly analyses the principle of how it works and proves the conception by simulation.Chapter 5 summarizes the main points that this paper tries to achieve and points out the further study in future.