Development of 50-kV 100-kW Three-Phase Resonant Converter for 95-GHz Gyrotron

Jang, Sung-Roc; Seo, Jungho; Ryoo, Hong-Je

doi:10.1109/tie.2016.2586021

Cited by 31 publications

(13 citation statements)

References 22 publications

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“…The figure illustrates the topology of the LCC converter and the sampling and control processes used by the control system. The state trajectory-based startup for the LCC converter is divided into three stages [14].…”

Section: Analysis Of State Trajectory-based Startup For Lcc Convertermentioning

confidence: 99%

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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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Section: Analysis Of State Trajectory-based Startup For Lcc Convertermentioning

confidence: 99%

“…The figure illustrates the topology of the LCC converter and pling and control processes used by the control system. The state trajectory-based for the LCC converter is divided into three stages [14]. In Stage 1, the resonant current of the LCC converter rises to -imaxN in switching cycle.…”

Section: Analysis Of State Trajectory-based Startup For Lcc Convertermentioning

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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“…The demand for high-voltage power supplies (HVPS) has grown over the last few decades due to the development of various industrial applications, including microwave generators [1], electrostatic precipitators [2], physical experiment [3], and medical X-ray sources [4]. Resonant converters are widely applied in HVPS designs, due to its capabilities of behaving as soft switches and using parasitic parameters as a resonant component.…”

Section: Introductionmentioning

confidence: 99%

“…These problems can be solved by the multiphase resonant converter that uses the parallel interleaved approach [6]- [10]. Jang S R [1]uses a multi-module resonant converter with input parallel and output series (IPOS) to increase the output voltage. The outputs of each module are stacked in series to obtain a higher output voltage, so the DC gain of each module is limited to a lower level [11]- [14].…”

Section: Introductionmentioning

confidence: 99%

An Improved IPOS LLC Resonant Converter With Sub-Module Output Voltage Sharing in Low Ripple High-Voltage Applications

Liu,

Chen,

Peng

et al. 2023

IEEE Access

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This paper proposed an input-parallel and output-series (IPOS) LLC resonant converter for applications with high voltage gain and low ripple, which considers the sharing of submodule output voltages. The resonant converter proposed has an integrated magnetics, which improves the utilization of the core. The reason is because magnetic fluxes can be superimposed or cancelled each other when the resonant currents are interleaved. Moreover, the influence of parameter mismatch in the resonant tank on voltage and current sharing in IPOS-LLC was analyzed based on the passive impedance theory. The results show that, by selecting smaller quality factors and using N-connections in high-voltage applications, the sharing of output voltage among modules can be well reflected, despite tolerances of the resonance parameters. Meanwhile, the voltage stress distribution of the rectifier diodes in each submodule is optimized, which improves the reliability of the circuit. By using the aforementioned conclusions, a prototype with 90 kHz, 40 V/4.8 kV, and 1.15 kW is established. The measured output voltage mismatch of 3.1% and voltage ripple rate of 0.16% at 3.7 nF output capacitance proves the effectiveness and correctness of the proposed resonant converter design.INDEX TERMS High-voltage, voltage sharing, magnetic integration, resonant converter.

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“…However, for this low power, portable application of the final structure should be as simple as possible. Bearing this in mind, resonant converters have the capability to adapt to very different output conditions, and they are widespread in the industry for many applications [14][15][16][17][18]. In fact, a comprehensive review of power supplies for plasma material processing [13] shows that solutions based on LLC or LCC resonant structures have already been proposed as intermediary power conversion systems [19][20][21].…”

mentioning

confidence: 99%

High-Voltage LC-Parallel Resonant Converter with Current Control to Detect Metal Pollutants in Water through Glow-Discharge Plasma

et al. 2022

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This paper presents a high-voltage power source to produce glow-discharge plasma in the frame of a specific application. The load has two well-differentiated types of behavior. To start the system, it is necessary to apply a high voltage, up to 15 kV, to produce air-dielectric breakdown. Before that, the output current is zero. Contrarily, under steady state, the output voltage is smaller (a few hundred volts) while the load requires current-source behavior to maintain a constant glow in the plasma. The amount of current must be selectable by the operator in the range 50 mA–180 mA. Therefore, very different voltage gains are required, and they cannot be easily attained by a single power stage. This work describes why the LC-parallel resonant topology is a good single stage alternative to solve the problem, and shows how to make the design. The step-up transformer is the key component of the converter. It provides galvanic isolation and adapts the voltage gain to the most favorable region of the LC topology, but it also introduces non-avoidable reactive components for the resonant net, determining their shape and, to some extent, their magnitude. In the paper, the transformer’s constructive details receive special attention, with discussion of its model. The experimental dynamic tests, carried out to design the control, show load behavior that resembles negative resistance. This fact makes any control loop prone to instability. To compensate this effect, a resistive ballast is proposed, eliminating its impact on efficiency with a novel filter design, based on an inductor, connected in series with the load beyond the voltage-clamping capacitor. The analysis includes a mathematical model of the filtering capacitor discharge through the inductor during the breakdown transient. The model provides insight into the dimensions of the inductor, to limit the discharge current peak and to analyze the overall performance on steady state. Another detail addressed is the balance among total weight, efficiency and autonomy, which appears if the filter inductor is substituted for a larger battery in autonomous operation. Finally, a comprehensive set of experimental results on the real load illustrate the performance of the power source, showing waveforms at breakdown and at steady state (for different output currents). Additionally, the detector’s constructive principles are described and its experimental performance is explored, showing results with two different types of metallic pollutants in water.

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Development of 50-kV 100-kW Three-Phase Resonant Converter for 95-GHz Gyrotron

Cited by 31 publications

References 22 publications

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

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

An Improved IPOS LLC Resonant Converter With Sub-Module Output Voltage Sharing in Low Ripple High-Voltage Applications

High-Voltage LC-Parallel Resonant Converter with Current Control to Detect Metal Pollutants in Water through Glow-Discharge Plasma

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