This paper presents a synchronous rectifier solution to improve efficiency of receiving part of a wireless power transfer system. We give theoretical calculations of power losses and compare these with power losses on Schottky diode rectifier, which is a common device, applied in such systems. We tested the presented circuit concept on the receiving part of a wireless power transfer system. Then we analyzed and compared theoretical calculations and experimental results.

The analysis of the existing systems of mechanical grippers of various operating principles and operating environments, in the design of which both soft and hard magnetic materials are executed. The characteristics of existing prototypes are shown and the results of our own research are presented.The article presents a study of the effect of the intermediate magnetic circuit length on the characteristics of magnetic gripper, the principle of which is based on the control of the field of a permanent magnet. The gripper based on this principle of action does not require constant energy expenditures to maintain both on and off states.The description of the magnetic gripper design and the design of the test bench is given, as well as the results of a series of experiments to determine the strength of the release of the gripper at different lengths of the magnetic circuit in the on and off states, followed by statistical processing of the data. The intervals of the ranges in which with a high degree of probability there will be a value of the gripping disengagement force for various lengths of the intermediate magnetic circuit are identified. The nature of the distribution of a random variable, which is the force of decoupling of the gripper, is determined. The dependences of the gripper decoupling force on the length of the intermediate magnetic circuit for each of the gripper states are constructed. It has been established that a decrease in the length of the intermediate magnetic circuit is the cause of a decrease in the gripping adhesion force. Plots of the dependence of the gripper decoupling force were constructed using the modes of the force values varieties to visually display the experimental results. The maximum adhesion force of magnetic pickup – 9.5 kg – was achieved with an intermediate magnetic core length of 50 mm, the minimum with a length of 25 mm – 5.6 kg.

The purpose of this paper consists in development of hardware, ensuring artificial tactile sensing of an anthropomorphic robot. Through analysis, performed to that end, it was discovered, that the majority of capacitive sensors, installed as well on the grippers of the anthropomorphic robots, as on robots of other types are implemented in terms of microelectromechamical systems (MEMS) technology. Obstacle detection and surface type recognition using the solutions, discussed in the related work, requires much closer proximity, than with the capacitive sensor, developed by us. We present a circuit schematics implementation of the sensor and charted graphical dependencies of the output voltage from distance for various objects, tracked by the sensor and made of different materials. We present experiment outcomes, obtained on examples of water and aqueous salt solution. We discovered, that the output voltage when using solid materials has similar values, but the respective values were quite different in the case of water or aqueous salt solution.