An Improved Partially Interleaved Transformer Structure for High-Voltage High-Frequency Multiple-Output Applications

Abstract

Abstract-This paper proposes an improved partially interleaved structure for high-voltage (several kV) high-frequency (several hundred kHz) multiple-output applications. The proposed transformer structure is compared with other typical structures with the leakage inductance, AC capacitance, AC resistance and the ratio of AC/DC resistance taken into consideration. The proposed structure features lower leakage inductance, smaller AC capacitance, lower AC resistance and lower ratio of AC-DC resistance, which is suitable for high-frequency high-efficiency applications. A planar transformer with the proposed structure was built and tested in an LCLC resonant converter, where the input voltage is 40 V, output is 4800 V, switching frequency is 500 kHz, the output power is 288 W and the efficiency is 96.8%, which validates the analysis.Index Terms-high-voltage, high-frequency, improved partially interleaved structure, multiple-output, planar transformer

High Efficiency High Step-up Isolated DC-DC Converter for Photovoltaic Applications

“…The Ld value is aimed to be minimized in transformer design in order to provide considerable low value for the resonance circuit [13]. Thus, interleaving structure is adopted for this case [14], shown in Fig.4 (Here for simplicity only one part of the primary windings is considered due to the symmetric working states). Two 1-turn primary windings are connected in parallel to share the large primary current and thus reducing the winding loss.…”

PSO-Algorithm-Based Optimal Design of LCLC Resonant Converters for Space Travelling-Wave Tube Amplifiers Applications

“…With the optimal parameters obtained from the PSO algorithm, the prototype of an LCLC resonant converter was built. Due to the advantages of low leakage inductance, low parasitic capacitance, and low AC resistance, the improved partially interleaved transformer structure presented in [24] was adopted, which is illustrated in Figure 8. According to the proposed PSO algorithm, the optimal L r , C s , L m , C p , and P tot can be obtained as follows: L r = 0.09 µH, C s = 1.0 µF, L m = 8.0 µH, C p = 13.2 nF, and P tot = 8.9 W.…”

“…With the optimal parameters obtained from the PSO algorithm, the prototype of an LCLC resonant converter was built. Due to the advantages of low leakage inductance, low parasitic capacitance, and low AC resistance, the improved partially interleaved transformer structure presented in [24] was adopted, which is illustrated in Figure 8. The dimensions of the transformer and the windings for the optimized LCLC resonant converter are shown in Table 2.…”

PSO-Algorithm-Based Optimal Design of the LCLC Resonant Converters for Space Travelling-Wave Tube Amplifiers Applications

“…With the optimal parameters obtained from the PSO algorithm, the prototype of an LCLC resonant converter was built. Due to the advantages of low leakage inductance, low parasitic capacitance, and low AC resistance, the improved partially interleaved transformer structure presented in [24] was adopted, which is illustrated in Figure 8.…”