公开(公告)号：US20230217551A1

公开(公告)日：2023-07-06

申请号：US17689830

申请日：2022-03-08

申请人： Delta Electronics, Inc.

发明人： Ming-Shi Huang ,  Zheng-Feng Li ,  Jhih-Cheng Hu ,  Yi-Liang Lin ,  Yu-Min Meng ,  Chun-Wei Lin ,  Chun Chang ,  Thiam Wee Tan

IPC分类号： H05B6/06 ,  H02M7/537 ,  H05B6/12

CPC分类号： H05B6/062 ,  H02M7/537 ,  H05B6/1209 ,  H05B2213/05

摘要： A heating device includes a resonant circuit, a detection unit and a control unit. The resonant circuit includes an inverter circuit and a resonant tank. The inverter circuit provides a resonant tank current and a resonant tank voltage. The resonant tank includes a heating coil, a resonant tank capacitor, a resonant tank equivalent inductor and a resonant tank equivalent impedance. The detection unit detects the resonant tank current and the resonant tank voltage to acquire associated parameters. The detection unit calculates an inductance of the resonant tank equivalent inductor according to a capacitance of the resonant tank capacitor, a resonant period and a first expression. The detection unit calculates an impedance value of the resonant tank equivalent impedance according to the inductance of the resonant tank equivalent inductor, a time difference, the resonant period, a reference current value, a negative peak current value and a second expression.