Abstract
This paper presents a phase-control method in paralleled resonant inverters to provide constant output power independent of load variation at MHz frequencies. A single-ended resonant inverter such as a class Φ2 inverter operates at 10's of MHz frequencies while providing high efficiency thanks to zero-voltage-switching (ZVS). However, when the load varies, their output power is not constant, which is not suitable for high-power applications such as plasma generation. To overcome this challenge, we propose a new approach, designing two inverters in parallel to maintain constant rated output power by controlling a phase shift between two inverters. First, we optimize the output resonant tank to minimize the phase shift to achieve high efficiency and reduce the value of the input inductance to ensure the ZVS operation for the entire range of load variation. Then we model the two-inverter design to find a proper phase shift at different load values. The desired PWM signals with the phase shift are applied to each switching device in the inverters through a PI controller. The proposed inverter was implemented to deliver a constant 300 W rated power at 13.56 MHz with an efficiency of the module above 92% over a load range of 25Ω-55Ω.
Original language | English (US) |
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Title of host publication | APEC 2023 - 38th Annual IEEE Applied Power Electronics Conference and Exposition |
Publisher | Institute of Electrical and Electronics Engineers Inc. |
Pages | 1070-1076 |
Number of pages | 7 |
ISBN (Electronic) | 9781665475396 |
DOIs | |
State | Published - 2023 |
Event | 38th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2023 - Orlando, United States Duration: Mar 19 2023 → Mar 23 2023 |
Publication series
Name | Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC |
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Volume | 2023-March |
Conference
Conference | 38th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2023 |
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Country/Territory | United States |
City | Orlando |
Period | 3/19/23 → 3/23/23 |
Bibliographical note
Publisher Copyright:© 2023 IEEE.
Keywords
- constant output power
- load independent
- paralleled resonant inverters
- phase shift control
- plasma generation