Study On Bi-directional Transmission Circuit Of Contactless Power Transmission

Contactless Power Transfer technology (Contactless Power Transfer, referred to as the CPT), based on the principle of electromagnetic induction and coupling is based, the use of power conversion technology, high-power high-frequency magnetic field coupling and energy conversion technologies (including resonant conversion techniques and technology, electromagnetic compatibility ), with the help of modern control theory and strategies to achieve non-contact way of electrical equipment to get power from the grid of a new type of power transmission mode. In the field of industrial and mining enterprises, autonomous underwater robot, the human body built electronic equipment, electric vehicle charging, battery charging and other consumer electronic devices are widely used in the field. The traditional contactless power transmission technology in the industry have encountered many problems, and now the non-contact power transmission technology can only be one-way transfer of energy, energy can flow in both directions, resulting in power motion control difficulty of the feedback energy becomes larger, The motor can not be four-quadrant operation, regenerative braking energy can not power to cause great feedback energy loss, while the traditional open-loop contactless power transmission operation, the primary excitation current is always in the biggest state, unable to switch the load to control Less efficient.In order to solve this thesis CPT system energy can not be two-way transmission, a soft-switching ZCS-PWM high-frequency bi-directional symmetric H bridge topology power transmission for the transmitter and receiver to complete the two-way direct energy conversion.In this paper, first analyzes the development of bi-directional power transmission circuits, and in contactless power transmission applications. Proposed contactless power high frequency bi-directional transmission symmetric H bridge power circuit topology, analysis of the topology design principles and parameters, including the positive energy into the work mode, reverse mode of energy work and energy into the free oscillation mode, and the establishment of A mathematical model. Finally, the primary resonant current BP neural network based control strategy.Then, according to the characteristics of the circuit topology, the design parameters, design the hardware circuit, including the main circuit, control circuit, detection circuit, drive circuit, power circuit design.Finally, according to the mathematical model, and join the BP network controller, simulation, simulation model was constructed. And then build the hardware circuit, the best simulation and experiments confirmed the correctness of the theory.