Parallel-loaded Resonant Converter Research Articles

36-5-2] 24V 전원 기반의 60kV 고전압 커패시터 충전기의 설계

In this paper, a 60kV high voltage capacitor charger(HVCC) based on a 24V battery was described. The HVCC should satisfy not only the extreme voltage gain for 60kV output based on 24V input but also compact size and lightweight for portability despite the high current burden due to the low input voltage. In addition, there are other considerations such as the voltage stress of each component and insulation. Considering these matters, the HVCC was designed based on the parallel loaded resonant converter and symmetrical Cockcroft-Walton voltage multiplier(CWVM). The parallel load resonant converter enables high-frequency operation by reducing switching losses through the zero voltage switching turn-on and snubber capacitor for soft turn-off. With proper design followed by analysis, the HVCC is capable of ZVS turn-on from the start of charging to charging the target voltage. Two symmetrical CWVMs are connected in parallel to the center-tapped transformer to alleviate voltage stress and insulation design difficulty of high-voltage devices. Through PSpice simulation, it was verified that the HVCC satisfies the target specification and the soft switching operation, and the electric field analysis was performed.

High Frequency MOSFET Charging Circuit Using Series Parallel DC-DC Resonant Converter for Wireless Power Application

This paper proposes a new circuit topology of high frequency switching DC-DC Series Parallel Loaded Resonant Converter (SPLRC). The circuit is proposed to be used for a wireless power transmission application that required fast-charging operation. Most of the components used here are low-cost and commercially available in the market. Then, the purpose circuit is transformed into a different equivalent circuit that can efficiently analyze AC and DC modes. For each model, the operation for the converter is first described and explained. A full detailed circuit simulation is then carried out to find out the workability of the purpose converter. From the simulation, optimization is carried out. Here the components value is obtained. MATLAB R2018A is used for simulation purposes rather than being tested again using PSIM software to further prove the validity of the model. All the finding is explained and discussed, here, from the simulation result, it is confirmed that a high-frequency switching circuit is operated as expected.

New Parallel Loaded Resonant Converter With Wide Output Voltage Range

This paper proposes a new parallel loaded resonant converter operating in a narrow switching frequency under wide output voltage range. The proposed converter is capable of operating under zero-voltage switching turn-on of switches and zero-current switching turn-off of diodes. Also, the resonant capacitor with feasible capacitance and current rating can be selected by adjusting the turn ratio of the transformer, making the proposed converter more realizable in high power application. Further, the proposed converter has zero voltage gain at notch resonant frequency, and therefore there are no current and voltage stress in the resonant tank during start-up. Experimental results from a 3-kW prototype are provided to validate the proposed concept.

Battery Float Charge Technique Using Parallel-Loaded Resonant Converter for Discontinuous Conduction Operation

This paper presents a battery float charge technique based on a parallel-loaded resonant converter. The main purpose of the float charge is to ensure that the battery remains fully charged indefinitely. With a simple circuit configuration and few components, low switching loss and high efficiency are achieved. The proposed parallel-loaded resonant converter is operated in discontinuous current mode to achieve high efficiency at a fixed switching frequency. With carefully designed circuit parameters, the power switches can support zero voltage switching and zero current switching. The operating principles and equivalent circuit are analyzed in detail. Experimental results are obtained using a 12-V 150-Ah rechargeable battery to confirm the feasibility of the proposed scheme. The maximum charging efficiency of the proposed topology during the overall float charge period is 97.6%. The measurements yield satisfactory performance.

Real-time simulation of a 20 kHz parallel-loaded resonant converter using an IBM RISC system/6000 model 350

Real-time simulation tools are useful in studying the large-signal behavior of power electronic converters in a system-level environment, and can provide a platform for the evaluation of hardware implementations of control loop designs. This paper presents an approach which allows real-time simulation of the open-Loop performance of a 20 kHz parallel-loaded resonant converter using an IBM RISC System/6000 Model 350. The state equations which describe the converter are transformed to recursive equations using finite-difference techniques. First- and second-order differencing schemes have been investigated and compared. The second-order method is superior to the first-order method because a time step of 3.5 /spl mu/s executes in 3.33 /spl mu/s with exceptional accuracy and negligible error propagation.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

Harmonic analysis of a parallel-loaded resonant converter

A method for calculating the harmonic components of the currents and voltages in a parallel-loaded resonant converter using frequency-domain techniques is presented. The converter is divided into an inverter section and a rectifier section. A harmonic model is developed for the resonant converter in which the rectifier section is treated as a voltage-dependent current sink. All voltages and currents in this model are represented by a Fourier series. The unknown coefficients in all Fourier series are calculated by using the harmonic model and Kirchhoff's laws. Because of the nonlinear nature of the rectifier section, an iterative technique must be utilized to find the unknown Fourier coefficients. >

A Fourier analysis for a fast simulation algorithm (for power convertors)

A powerful discrete modeling approach to the simulation of a switching converter that has appeared in power electronics literature over the last several years is briefly reviewed, and some desirable traits for its matrix exponential subroutine are discussed. The key result is a systematic and generic Fourier analysis that operates on the steady-state solution as provided by a discrete model. The Fourier analysis algorithm was tested on a phase-controlled parallel-loaded resonant converter which is useful as a fixed-frequency low-distortion AC source. Three verifications of the algorithm were made: a phasor analysis, an alternate closed-form analysis directed specifically to the problem at hand, and an analysis using experimental data. The performance of the algorithm was good for the case considered.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>