An integrated controller for high‐frequency LCLC resonant inverter with phase‐shifted control and frequency regulation

Abstract

SUMMARYHigh-frequency alternating current has an extensive application as a result of outstanding advantages. The aim of the study is to develop a high-frequency power source to feed the auxiliary loads of vehicle application such as electric fans, blower motors, and lighting. A feasible implementation of high-frequency power source is examined by a full-bridge LCLC resonant inverter. The corresponding control scheme is proposed for the fourth-order resonant inverter to confront the control challenges of low output harmonics and dynamic nonlinear load. Firstly, an analysis parameter S r is defined to address the possible impacts of the varying operational frequency to output THD and ZVS features. Secondly, an integrated control scheme is presented to implement pulse-width control at heavy load and frequency regulation at light load. Lastly, an experimental prototype is accomplished with the peak voltage of 35 V and the output power of 120 W. The accordance of experimental results and theoretical analysis testifies that the proposed control scheme can achieve the low harmonics and high conversion efficiency over a wide scope of operational conditions.

An active damping control strategy with improved transient performance for high‐frequency AC power distribution in intelligent vehicles

“…Some scholars and enterprises have already introduced the HFAC PDS technology into the intelligent vehicle applications. [15][16][17][18][19] As shown in Figure 1, the structure diagram of voltage-based HFAC PDS for intelligent vehicles is composed of HFAC voltage source and load side. Power is delivered to intelligent vehicles load side through HFAC bus, which can reduce the line loss of the power transmission.…”

Development of compact rapid capacitor charging power supply for TMS

“…Therefore, the LC–LC RC retains these advantages of LCL‐T RC while having a smaller (kVA/kW) rating of the RC. Several other topologies of fourth‐order LC–LC RCs have been widely used in the industrial fields such as wireless power transfer [23], high‐frequency power supply [24], and capacitive power transfer system for electric vehicle charging [25]. However, this topology has not been analysed and used as a constant current source for capacitor charging.…”

Modular‐structured resonant converter for multilevel converters in micro grids

“…Moreover, these fuels are a major cause of problems like atmospheric pollution and global warming. [8][9][10][11]26,27 However, high power LLC converter demands heavy currents on series tank capacitor, thus limits the application of the converter on high power level. This results in need for significant DC-DC power conversion application for efficient extraction of energy from the intermittent sources.…”

“…At any load, both zero voltage switching (ZVS) for inverter switches and zero current switching (ZCS) for converter is gained. 26,27 Here in this paper, initially at full load condition, output voltage is regulated by duty cycle control up to critical duty ratio before ZVS fails. [8][9][10][11]26,27 However, high power LLC converter demands heavy currents on series tank capacitor, thus limits the application of the converter on high power level.…”

“…In conventional hybrid control method, based on priority, either frequency or duty cycle are adapted to maintain constant output voltage. 26,27 Here in this paper, initially at full load condition, output voltage is regulated by duty cycle control up to critical duty ratio before ZVS fails. Once the critical duty cycle is reached, the output voltage will be maintained constant by adjusting both frequency and duty cycle concurrently with the algorithm as load varies.…”