A High-Frequency Inverter for Variable-Load Operation

Braun, Weston D.; Perreault, David J.

doi:10.1109/jestpe.2019.2893591

Cited by 34 publications

(8 citation statements)

References 24 publications

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“…Re-introduction of the series diodes in the CSRI topology could relax the timing requirements in applications where robustness of the control is desired, at the expense of increased losses and component count [24,27]. Alternatively, using a microcontroller with a high-resolution PWM architecture to create the driving signals, as done in, for example, [35] and [36], would likely also enable operation closer to the breakdown voltage of the switches. The tradeoff in this approach is that if the system is extended to closed loop control, FIGURE 14 Calorimetric measurement of the efficiency of the CSRI power module at varying output power the FPGA is not available for the implementation of a control algorithm with fast real time response.…”

Section: Resonant Operationmentioning

confidence: 99%

Development of a current source resonant inverter for high current MHz induction heating

Aunsborg

Duun²,

Munk‐Nielsen

et al. 2021

IET Power Electronics

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High frequency industrial induction heating processes typically employ resonant inverters to reach high efficiency at high power levels. Advancements in wide band gap (WBG) device technology has made it feasible to push the possible frequency of these processes into the MHz regime using solid state technology. Several topologies can be applied, each with advantages and drawbacks. This paper presents a current source resonant inverter (CSRI) employing a custom designed power module utilizing 1700V SiC MOSFETs for MHz operation of a high‐Q resonant tank for induction heating, which presents new challenges in the inverter module design. An integrated gate driver structure is demonstrated driving four MOSFETs in parallel in MHz operation. Theoretical analysis predicts substantial parasitic influence on inverter operation, and thus an inverter is constructed to provide experimental verification of MHz operation, while the challenges associated with high frequency CSRI operation are discussed. In the experimental inverter setup, the fabricated power module achieves >90% efficiency for a calculated reactive power of 170 kVA and 2.3 kW output power during unloaded operation, validating the inverter design for extension to higher power loaded operation.

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Section: Resonant Operationmentioning

confidence: 99%

Development of a current source resonant inverter for high current MHz induction heating

Aunsborg

Duun²,

Munk‐Nielsen

et al. 2021

IET Power Electronics

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show abstract

“…2 [8], such that soft switching can be achieved with a variable resistive/inductive load. Other variable-load singleswitch inverters such as class E or class φ 2 inverters (e.g., [4]) can also be used, though the variable-load class D inverter has a relatively superior switch utilization [11], so may be preferred at frequencies and voltage levels at which its highside device can be effectively driven. It is important to note that in many switched-mode inverters two dominant loss mechanisms that can limit achievable performance include switch conduction losses and output capacitor losses.…”

Section: Techniques For Output Power Controlmentioning

confidence: 99%

“…This can be achieved by utilizing dynamically adjustable networks (e.g., a TMN) to dynamically change the loading of the inverters (e.g., [5], [30]). Alternatively, the system can utilize dynamic interactions between a number of inverters to achieve output power control while maintaining acceptable inverter loading for high efficiency operation [11], [31]. A further possible approach is to turn on and off individual inverter or power amplifier subsystems to cause load modulation of active units (and reduce power loss otherwise associated with inactive units), e.g., [32].…”

Section: Structural Modulationmentioning

confidence: 99%

Comparison of Radio-Frequency Power Architectures for Plasma Generation

Bastami

Zhang

Jurkov

et al. 2020

2020 IEEE 21st Workshop on Control and Modeling for Power Electronics (COMPEL)

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Applications such as plasma generation require the generation and delivery of radio-frequency (rf) power into widely-varying loads while simultaneously demanding high accuracy and speed in controlling the output power across a wide range of power levels. Attaining high efficiency and performance across all operating conditions while meeting these system requirements is challenging, especially at high frequencies (10s of MHz) and power levels (1000s of Watts and above). This paper evaluates different architectures that directly address these challenges and enable efficient high-frequency operation over a wide range of output power levels and load impedances with the capability of fast output power control (e.g., within a few microseconds). We review techniques for achieving fast output power control and evaluate their suitability in efficient rf systems demanding accurate and fast control of output power. Two dc-to-rf system architectures utilizing the discussed power control techniques are presented to illustrate both the achievable performance benefits as well as their robustness to load impedance variation, and are compared using time-domain simulations. The results indicate the ability of the proposed architectures to maintain high efficiency (> 90%) across a very wide range of output power levels (e.g., over a factor of up to 85x) while being robust to load impedance variations.

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“…Although this approach allows a high-efficiency operation over a wide load range, the output voltage range of typical RF dc-dc converters is limited [2], [17]. However, it has been shown that the flexibility of the converters can be increased by additional circuit effort [13], [19], [20].…”

Section: Introductionmentioning

confidence: 99%

A Resonant Push–Pull DC–DC Converter With an Intrinsic Current Source Behavior for Radio Frequency Power Conversion

Weitz

Utzelmann

Ditze

et al. 2022

IEEE Trans. Power Electron.

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In this work, a resonant push-pull dc-dc converter suitable for switching frequencies in the MHz-range is investigated. Despite a simple design procedure with no need of multiresonant tuning, the converter topology is capable of providing a constant output current over a wide output voltage range in unregulated operation. Based on an analytical solution of steady-state operation, normalized dependencies of converter behavior are determined and used to formulate generalized design considerations. In order to verify the theoretical analysis, the design procedure of a 300 W prototype operating at a switching frequency of 6.78 MHz is described considering the impact of circuit parasitics on converter operation. The prototype provides a stable operation within the full output voltage range of 0-150 V and reaches a peak efficiency of 93% at the nominal output voltage. A rapid transient response of the converter is demonstrated by applying a closed-loop on/off-control to the prototype.

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A High-Frequency Inverter for Variable-Load Operation

Cited by 34 publications

References 24 publications

Development of a current source resonant inverter for high current MHz induction heating

Development of a current source resonant inverter for high current MHz induction heating

Comparison of Radio-Frequency Power Architectures for Plasma Generation

A Resonant Push–Pull DC–DC Converter With an Intrinsic Current Source Behavior for Radio Frequency Power Conversion

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