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This paper presents the influence of switching frequency on the dual active bridge (DAB) dc-dc converter on the power transmission characteristics and the soft switching realization. Based on this, a switching frequency optimization of dual phase shift control is proposed to realize ZVS over the whole load range. It is an optimization of the PWM plus phase-shift control, which can reduce switching...
This paper proposes a novel integrated power system for electric vehicles (EVs) to improve the power density and efficiency at a less cost. It integrates the on-board charger (OBC) and the low-voltage DC/DC converter (LDC) by common use of semiconductor devices, capacitors and magnetic components. Therefore, the volume and cost of the integrated system is reduced compared with the conventional two...
In this paper, an LLC resonant converter design methodology for wide output voltage range based on simplified operation mode analysis is presented. A new method to calculate the magnetizing inductance is developed based on the LLC mode analysis, which can ensure soft-switching operation when a maximum constant output power is implemented. The parameters, resonant frequency, maximum frequency and dead...
The comprehensive resonance analysis and soft-switching design of the isolated boost converter with coupled inductors are investigated in this paper. Due to the resonance participated by the voltage doubler capacitor, clamping capacitor, and leakage inductance of coupled inductors, the reverse-recovery problem of the secondary diodes is restrained within the whole operation range. By choosing appropriate...
In this paper, a new zero voltage current switching (ZVCS) resonant voltage-fed push-pull converter for vehicle inverter application is proposed. It achieves ZCS off of the secondary diodes with using secondary leakage inductance as resonant element. By selecting appropriate dead time, the proposed circuit can also feature ZVS on of MOSFETs. The proposed topology can achieve satisfying performance...
A resonant current-fed push-pull converter with active clamping is investigated for vehicle inverter application in this paper. A communal clamping capacitor and a voltage doubler topology are employed. Moreover, two kinds of resonances to realize ZVS ON of MOSFETs or to remove reverse-recovery problem of secondary diodes are analyzed and an optimized resonance is utilized for volume restriction....
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