1,721,211 research outputs found
Design of high efficiency interleaved active clamp zero voltage switching forward converter
No full textA high efficiency interleaved active clamp forward converter with self-driven synchronous rectifiers for a modular power processor is presented. To simplify the gate drive circuits, the n-p MOSFETs coupled active clamp method is used. An efficiency of about 90% for a load range of 50-100% is achieved. Details of design for the power stage and current mode control circuit are provided, and also some experimental results are given
Novel Single-Stage, Single-Switch, AC/DC Converter with Magnetic Energy Feedback Technique for Power Factor Correction
No full textA novel single-switch, single-stage, AC/DC forward converter with a transformer voltage feedback technique for power factor correction is proposed. The operational principle and analysis of the proposed converter are presented. The proposed converter gives good power factor correction, low line current harmonic distortions, and tight output voltage regulation. The prototype shows that the IEC 555-2 requirements are met satisfactorily with nearly unity power factor
Energy-Recovery Circuit Using an Address Voltage Source for PDPs
No full textA highly efficient energy-recovery circuit (ERC) is proposed for plasma display panels (PDPs). This ERC employs an address voltage source used in an addressing period as the PDP is charged and discharged. As a result, the proposed circuit can reduce power consumption, switching loss, heat dissipation, and production cost. To verify the operation and features of the proposed circuit, experimental results with a 42-in standard-definition PDP are provided
Novel Two-Phase Interleaved LLC Series-Resonant Converter Using a Phase of the Resonant Capacitor
No full textAn LLC series-resonant converter has many unique characteristics and improvements over pulsewidth-modulation topologies. However, many output capacitors are needed in parallel to satisfy an output voltage ripple and a rated ripple current of the capacitors. This paper deals with a novel two-phase interleaved LLC resonant converter using a phase of the resonant capacitor. The proposed converter satisfies low output-voltage ripple requirement and meets the rated ripple of output capacitor's current with few output capacitors. The operation and features are considered in detail, and a prototype with a 12-V-100-A output is investigated
High-efficiency boost half-bridge converter with fast boost current transferring ZVS operation
No full textA new boost half bridge (BHB) converter is presented. It is composed of additional switch, diode and coupled winding to boost inductor of BHB converter. Using the transferring of boost inductor current to coupled winding in a short period, the cancellation of zero voltage switching (ZVS) current, which always occurs in convention one, is prevented. Therefore, the ZVS operation is easily achieved by leakage inductor current of transformer. Furthermore, since negatively build-up leakage inductor current of boost winding helps the ZVS operation throughout full load range, the excellent ZVS operation and high efficiency is achieved
Full ZVS-range transient current buildup half-bridge converter with different ZVS operations to load variation
No full textA full zero voltage switching (ZVS) range transient current buildup half-bridge converter,is proposed. The proposed converter controls the secondary synchronous switches to build up the current for the ZVS operation. In addition, the blocking capacitor in the secondary side of the transformer is used to make the different current buildups and different ZVS operations with the load variation. Furthermore, it eliminates the dc offset of the magnetizing current. Therefore, the considerably effective ZVS characteristics can be ensured in the full-load ranges without any additional conduction losses
Input-voltage feedforward (IVFF) circuit minimizing current stress of voltage-doubler rectified asymmetrical half-bridge (VDRAHB) converter
No full textA new input-voltage feedforward (IVFF) circuit for a voltage-doubler rectified asymmetrical half-bridge (VDRAHB) converter is proposed in this letter. The proposed circuit regulates output voltage not by reducing duty ratio but by increasing switching frequency as input voltage increases. Therefore, by employing the proposed IVFF circuit into the VDRAHB converter, the peak currents of the overall components can be greatly reduced, and also, efficiency can be improved at high input voltages
An integrated single-stage quasi-resonant power factor correction converter with active clamp circuit
No full textA new integrated single-stage zero current switched (ZCS) quasi-resonant converter (QRC) for the power factor correction (PFC) converter is introduced in this paper. The power factor correction can be achieved by the discontinuous conduction mode(DCM) operation of an input current. The proposed converter has the characteristics of the good power factor, low line current harmonics, and tight output regulation. Furthermore, the ringing effect due to the output capacitance of the main switch can be eliminated by use of active clamp circuit. A prototype converter has been designed and experimented based on design equations. The line current waveform of the prototype shows about 15% of total harmonic distortion at rated condition. Also, the efficiency and the power factor can be obtained about 87% and 0.985, respectively, at rated condition. The proposed converter is suitable for a low power level applications with a tightly regulated output voltage and a high switching frequency
A novel two phase interleaved LLC series resonant converter using a phase of the resonant capacitor
No full textAn LLC series resonant converter has many unique characteristics and improvements over PWM topologies. However, many output capacitors are needed in parallel to satisfy output voltage ripple and the rated ripple current of the capacitors. This paper deals with a novel two phase interleaved LLC resonant converter using a phase of the resonant capacitor. The proposed converter can satisfy Output Voltage ripple and a rated ripple current of capacitors with few Output capacitors, relatively. The operation and features are considered in detail and a prototype with a 12V-100A output is investigated
Cost Effective Single Energy Recovery Circuit for Plasma Display Panel with Asymmetrical Recovery Operation
No full textA new single energy recovery circuit (ERC) only connected to one of scan and sustain electrodes of the plasma display panel (PDP) is proposed. Different from prior ERC having the same two drivers on both electrodes of the PDP, the proposed circuit composed of one inductor and two power switches is only located on one of both electrodes of the PDP and recovers the energy of the panel without excessive voltage stress of sustaining inverter. So its size and cost can be greatly reduced. Moreover, it can fully change the panel voltage between -VS and VS with asymmetric energy recovery operation and ensure the stable and uniform light emission from the PDP without voltage drop caused by the large discharge current during the transition time of the sustaining pulse
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