Modular high-voltage bias generator powered by dual-looped self-adaptive wireless power transmission

Abstract

We proposed a modular high-voltage (HV) bias generator powered by a novel transmitter-sharing inductive coupled wireless power transmission technology, aimed to extend the generator's flexibility and configurability. To solve the problems caused through an uncertain number of modules, a dual-looped self-adaptive control method is proposed that is capable of tracking resonance frequency while maintaining a relatively stable induction voltage for each HV module. The method combines a phase-locked loop and a current feedback loop, which ensures an accurate resonance state and a relatively constant boost ratio for each module, simplifying the architecture of the boost stage and improving the total efficiency. The prototype was built and tested. The input voltage drop of each module is less than 14% if the module number varies from 3 to 10; resonance tracking is completed within 60 ms. The efficiency of the coupling structure reaches up to 95%, whereas the total efficiency approaches 73% for a rated output. Furthermore, this technology can be used in various multi-load wireless power supply applications.

Comparison of the performance of a high voltage generator insulated by gas or liquid dielectric

“…The wireless feature can be obtained either by light, as in our device, or by magnetic induction. [3][4][5] The series connection and the use of light as the main power source allows both gases and liquids to be used as insulators, while the use of liquids is forbidden in induction generators, except for single gap ones like transformers, where a combination of solid and liquid insulation is used. 6 Considering the advantages on the safety risk reduction and the easiness of operation brought by the use of a liquid insulator with respect to a gaseous one, we deeply investigated the pros and cons of both choices in order to base our decision on solid ground.…”