Time domain analysis and efficiency research of high voltage power supply for electron beam welder based on LCC resonance in DCM

Fan, Shengjun; Li, Haisi; Wang, Zeting; Yuan, Yiqin

doi:10.1109/icems.2017.8056097

Cited by 6 publications

(1 citation statement)

References 2 publications

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“…Fundamental harmonic approximation (FHA) is widely utilized, but the ignorance of harmonic components reduces the accuracy of circuit analysis [5]. Extended describing function (EDF) modeling methods [6] or time-domain analysis methods [7] are adopted to solve such problems. A state trajectory analysis was proposed to achieve higher accuracy of resonant tank behavior control [8].…”

Section: Introductionmentioning

confidence: 99%

Digital Implementation of LCC Resonant Converters for X-ray Generator with Optimal Trajectory Startup Control

Zhao

Zhang

et al. 2022

WEVJ

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High voltage LCC resonant converters have been widely used in X-ray imaging systems in automobile nondestructive testing (NDT) applications. Low ripple voltage waveforms with fast-rising time under no-overshoot response are required for safety in such applications. The optimal state trajectory control (OTC) based on the state plane model is one of the most effective control methods to optimize transient response. Dynamic variations of the resonant voltages/currents are described as corresponding trajectories on the state plane. The transient relations can be determined by evaluating the geometric relationships of the trajectories. However, the LCC resonant converter has more state variables, resulting in more complex calculations that make the state trajectory control challenging. Furthermore, the startup duration is the most demanding process of the state trajectory control. In this paper, a digital implementation based on a hybrid controller built in a field-programmable gate array (FPGA) is proposed for LCC resonant converters with optimal trajectory startup control. A coordinated linear compensator is employed to control the switching frequency during steady-state conditions, hence eliminating the steady-state error. The experimental results were conducted on a 140-kV/42-kW LCC resonant converter for an X-ray generator. It achieves a short rising time of output voltage with no additional current or voltage stress in the resonant tank during startup compared to the conventional digital implementation control.

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