LCC-type Resonant Converter Research Articles

Analyzing an LCC-Type Resonant Converter in a Continuous Current Mode of LC Circuit

Analyzing an LCC-Type Resonant Converter in a Continuous Current Mode of LC Circuit

High-Voltage Charging Power Supply Based on an LCC-Type Resonant Converter Operating at Continuous Conduction Mode

This article describes the design, implementation, and testing of a 2.0-kW high-voltage rep-rate charging power supply based on an non-isolated inductor-capacitor-capacitor (LCC)-type resonant converter operating at continuous conduction mode, which provides a constant charging current with high control accuracy/efficiency. The design of the proposed capacitor charging power supply (CCPS) has been carried out in such a way that to be a low cost, simpler, compact, and efficient driver for the miniature pulsed plasma sources (PF-3J: 10 kV, 84 nF, 48 nH, and PF-225: 15 kV, 2 μF, 50 nH), operating at repetitive discharges with the following specifications: 20 kV, 2.0 kW, and maximum pulse repetition rate up to 50 Hz. In order to understand the required conditions of such a power converter toward the functional stability, a detailed theoretical study of, and the design considerations along with the simplified design equations taken for, the proposed converter are discussed from a practical viewpoint. Due to the use of a fast complex programmable logic device (CPLD) controller, the synchronization of the start of the leg switching voltage with the moment of zero-current detection was observed at the switching frequency of 125 kHz. The functional stability of the CCPS at repetitive discharge mode was verified via operation at low and high frequencies. The results of diagnostics successfully confirmed the accurate performance of the control and sampling circuits for the moderate repetition rate of 0.5 Hz with the repeatability of about 0.1%. Finally, the developed rep-rate high-voltage charging power supply was shown to be very reliable, even under faulty operating conditions in the system.

New flatness‐based control of a high‐voltage generator for medical X‐ray applications

This study presents a new flatness-based control scheme for the quantum series–parallel LCC-type resonant converter with output voltage doubler for high-voltage pulse applications, like medical X-ray imaging. Based on a previously derived continuous time model of the system, a flat output of the system model is shown. Moreover, an optimised trajectory planning algorithm with limited resonant current and the controller design are addressed. Details on the experimental set-up and the real-time controller implementation on an FPGA are given. Measurement results show the accuracy of the presented control method.

Low-Ripple and High-Precision High-Voltage DC Power Supply for Pulsed Power Applications

This paper describes the design and implementation of a three-phase resonant converter with low ripple and high control accuracy. Based on a three-phase LCC-type resonant converter-which has advantages of low ripple, highefficiency, and high-power density compared with a single-phase converter-a high-voltage power supply with low ripple (<;0.1%) was designed. In addition to the general merits of an LCC-type resonant converter operating at continuous conduction mode- including soft switching, low conduction loss, and current source characteristics-the proposed scheme uses only one phase under a light-load condition by having different leg designs of the gate drive circuit and snubber parameters. This allows the design to overcome the operational constraints of the general LCC-type resonant converter. The distinctive design of the three-phase converter structure provides high efficiency and low ripple not only during rated operation, but also under light-load conditions. In order to analyze the high performance of the proposed scheme from no load to rated load, a PSPICE simulation was carried out. Comparison results with a conventional LCC-type resonant converter based on a single-phase structure are analyzed from the viewpoints of output ripple, losses, and operable load range. Using the proposed converter, a 20-kV, 20-kW high-voltage dc power supply design and implementation was presented with a superior gate drive circuit. Finally, the superiority of the proposed converter was verified through a simulation and experimental results. It was experimentally confirmed that the developed power supply achieves high performance in terms of efficiency (98%), operable load range (0.5-20 kV), and low ripple (0.05%), with a high power density.

Analysis and design of a three-phase LCC-type resonant converter

A three-phase dc-to-dc LCC-type resonant converter with high-frequency transformer isolation is proposed. The operation and a simple analysis of the converter are presented. Design curves are obtained and a design example is given. SPICE simulation and experimental results are presented to verify the performance of the proposed converter for varying load conditions. The converter proposed has several advantages, e.g., operation in lagging PF mode for the entire load range, requires a narrow variation required in switching frequency, reduced component size and stresses, etc.