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In this paper, a current-feed resonant two-switch forward DC-DC Transformer (DCX) is proposed for high-efficiency and high-density unregulated bus converter applications. With a resonant capacitor in series with the leakage inductance of the transformer, ZCS turn-on and nearly ZCS turn-off can be achieved for the primary switches and there is no body diode and reverse recovery losses in the SR. Meanwhile,...
LLC resonant converter is an attractive topology to achieve high power density with high efficiency. However, the high switching frequency and circulating current result the poor efficiency of a LLC resonant converter under light load condition. To improve efficiency further, a modified burst-mode control is implemented in the proposed controller. The switching frequency decreases gradually during...
This paper proposes an AC-AC converter, which consists of T-type three-level rectifier and inverter, for an on-line UPS. The switching loss of the proposed AC-AC converter is drastically reduced because the proposed converter is driven at a very low switching frequency which is six times of input side frequency. The T-type rectifier separates the maximum phase-voltage, medium phase-voltage and minimum...
The loosely coupled transformer is the key component of a contactless power transmission (CPT) system. In order to reduce the size of the loosely coupled transformer, mixed winding arrangement containing planar winding and vertical winding is proposed in this paper. However, because of the using of the vertical winding, the proposed transformer has a large part of leakage flux at the back of the core,...
In general, Boost circuit is widely used as PFC circuit to achieve high power factor (PF), but the power supply needs to add a Buck circuit in the case of low-voltage output applications. Two-stage circuit requires more components and two control circuits. On the other hand, as the power levels increase, the full-bridge diode rectifier reduces the converter efficiency due to the large conduction losses...
This paper proposes a novel robust method for three-phase rectifier system with high quality for higher power applications. The system consists of two stages: The front stage combines the unique features of a low-kilovoltampere 12-pulse rectifier scheme along with a single-phase pwm rectifier scheme to shape the input current to a sinusoidal waveshape. The single-phase pwm rectifier stage is rated...
One cycle PFC technique has advantages of AC voltage sensor elimination and simplified current loop, thus it has been utilized on various rectifier topologies. In this paper, a modified one cycle PFC method for the delta-connected cascade H bridge (CHB) rectifier is proposed, which combines the one cycle PFC control, zero sequence current injection control and DC voltage balancing control. With the...
In this paper, a novel hybrid current balancing method for multi-channel LED drive based on quasi-two-stage converter is proposed. In presented structure, each output modules includes two LED strings and can achieve internal current balancing easily through its current balancing capacitor. The current regulators are used to balance the currents among the output modules. By applying the partial power...
This paper introduces a novel three phase high step-up single-stage flyback converter with no electrolytic capacitor for small-scaled wind generation application. The proposed converter combines flyback cell and three-phase single-switched boost converter in order to achieve high step-up voltage gain at low input voltage and high efficiency at rated input voltage. The circuit is operating in discontinuous...
A switching mode power supply will easily cause serious electro-magnetic interference (EMI) because of the high frequency operation of the power devices. The traditional passive EMI filter (PEF) is bulky and also not efficient in low frequency range. A differential mode active EMI filter (AEF) for DC/DC converter is proposed in this paper. With the analysis and modeling of the full bridge DC/DC converter,...
This paper analyzes the necessity of establishing the dc bus voltage of the Dual Active Bridge (Dual Active Bridge, DAB) converter when starting up. And the startup method that the DC-bus voltage is built up only by high-voltage-side body diode of the DAB converter rectifying is proposed in the paper. The detailed steps and the software realization method are elaborated. The saturation phenomenon...
There is discontinuous input current or output current in most of the isolated DC-DC converter. If continuous current is required, generally we need to add additional bulky filter, which will reduce the system's power density. In this paper, the method of adding a built-in filter to the isolated converter to achieve a continuous input current was employed. The built-in filter is composed of transformer...
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