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This document presents a method to synthesize an air-core transformer with a given inductance matrix. The proposed algorithm is used to design a two-winding transformer for a Φ2 resonant dc-dc converter operating in the VHF (30-300 MHz) regime. The method realizes the required inductance matrix to achieve proper tuning while trading volume and efficiency. Two sets of transformers were fabricated and...
In this paper, a series resonant converter (SRC) using a piezoelectric transducer for low profile application is proposed. The proposed circuit allows integration of the power circuit by eliminating conventional bulky magnetic components. Effects of the material constants such as electromechanical coupling coefficient and mechanical quality factor on the converter performance are discussed. Design...
This document introduces a design methodology for a resonant boost converter topology that is suitable for operation at very high frequencies. The topology we examine features a low parts count and fast transient response but suffers from higher device stresses compared to other topologies that use a larger number of passive components. A numerical design procedure is developed for this topology that...
In this paper a series-parallel resonant converter with a current doubler at the output is designed to produce a pulsed voltage to feed an electrochemical waste water treatment cell. The small signal model of the converter is derived to design the compensators of a cascaded control loop with an inner current and an outer voltage loop. The design procedure of the compensators in the control loop is...
The design of a 1 MW, 20 kHz, isolated, bidirectional 12kV to 1.2kV DC-DC converter for renewable energy applications is presented. The main topics addressed are: High-Voltage (HV) side switch, topology & modulation and Medium Frequency (MF) transformer. A study of the possible HV side switches, considering 4.5kV IGBTs is performed, fixing the requirements from the topology and modulation side...
A novel two-phase interleaved LLC resonant converter is proposed, which can manage the number of phases by output loading. In the proposed scheme, the output load current is detected with sensing resistor in the output terminal. The measured value is compared with the threshold value for phase management and the signal is generated to trigger the gate driver. As a result, it is possible to improve...
In this paper, an interleaved soft-switching dc-to-dc converter configuration is proposed. It consists of two parts: the primary side is a constant-frequency asymmetrical converter with active clamp feature and the secondary side is a series resonant tank circuit. The active clamp circuit recycles the energy stored in the magnetizing inductance of transformer to allow main/auxiliary switches turn-on...
A systematic approach to the analysis and design of a soft-switching bidirectional converter for the battery charge equalization (BCE) control of a medical power operated vehicle is presented in this paper. The quasi-resonant (QR) converter circuit is designed to achieve the zero current switching (ZCS) for reducing the switching loss of the bidirectional converter. Results indicate that the switching...
This paper presents a novel resonant dc-dc converter using Z-source impedance network. The conventional series resonant converter suffers from efficiency degradation problem when the input voltage range is wide because the switching frequency of converter should be increased far away from resonant frequency to control output voltage. The proposed Z-source resonant dc-dc converter can minimize switching...
This paper deals with a reduction method of output current ripples in a resonant switched-capacitor converter (RSCC) by applying an interleaving technique. Two RSCCs are connected in parallel and operated with their switching waveforms displaced by a half of the switching period. Application of a phase-shift control method to the RSCCs enables not only an equal current sharing between the RSCCs but...
A power conditioner with a high voltage gain for a combined heat and power generation system based on a solid oxide fuel cell is presented in this paper. The power conditioner consists of two dc-to-dc stages: an interleaved boost converter with minimized input current ripple and a series resonant converter. By analytic investigation, a pre-estimation of the converter's efficiency is shown and a method...
Low-profile, high efficiency power supply is today's industry trend for Plasma Display Panel (PDP) application system. Transformer is the major challenge and bottleneck for achieving low-profile, high power density converter. Generally, it is necessary for low-profile converter to operate it at high switching frequency. However, it is very difficult to design converter using flat magnetic component...
Feedback sensor isolation is often an expensive necessity in power converters, for reasons of safety and electromagnetic compatibility. A disturbance observer-based control strategy for a dual-output resonant converter is proposed to overcome this problem. Current control of two LED loads is achieved through estimation rather than measurement. Robustness against temperature changes, which have significant...
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