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In this paper, a bridgeless Cuk derived AC/DC converter is proposed. The present circuit topology separates the input PFC current and output voltage-regulation current, which reduces the switch current stresses and improves system thermal management compared to the conventional bridge and bridgeless Cuk topologies. In addition, the proposed bridgeless topology has semi-soft switching function of all...
This work presents a unidirectional three-phase PFC rectifier well-suited for applications targeting high efficiency, reduced conducted emissions and/or high power density. The characteristics of this circuit, which is based on the paralleling of DELTA-switch rectifiers by means of interphase transformers, including the principles of operation, modulation strategy, suitable PFC-oriented control scheme,...
In this study, a new Zero Voltage Transition (ZVT) snubber cell is proposed. Zero Voltage Transition (ZVT) turn on and zero voltage switching (ZVS) turn off are achieved for the main switch. Also, the auxiliary switch is turned on with zero current switching (ZCS) and turned off with ZVS. The main advantage of this snubber cell is that it reduces the current stresses of the auxiliary circuit components...
When the universal-input applications are dealt with the power-factor-correction (PFC), there is always the problem of higher switch voltage stresses and higher inductor conduction losses. The paper has a topology namely buck-interleaved buck-boost (BuIBB) converter has lower switch voltage stresses and lower inductor conduction losses compared to other single-switch or two-switch converter topologies...
In this paper, a new single phase ac-dc PFC bridgeless rectifier with multiplier stage to improve the efficiency at low input voltage and reduce the switch-voltage stress, is introduced. The absence of an input rectifier bridge in the proposed rectifier and the presence of only two semiconductor switches in the current flowing path during each switching cycle result in less conduction losses and improved...
This paper introduces a new bridgeless rectifier that operates with high power factor and high efficiency. The proposed rectifier is derived from the conventional single-ended primary inductance converter (SEPIC) and it is suitable for universal line applications. Multiplier cells have been introduced in the literature to extend the converter gain and to decrease the voltage stresses across the converter...
A 300 W and 100 kHz single phase soft switching power factor correction (PFC) circuit is developed with a new active snubber cell. This active snubber cell provides Zero Voltage Transition (ZVT) turn on and Zero Current Transition (ZCT) turn off for the main switch without any extra current or voltage stresses. The active snubber cell component values are defined by optimization process to minimize...
This paper presents a new series inductance interval (SII) PFC, using an auxiliary winding, to limit double power processing interval around the input voltage zero crossing. This limitation removes the unessential double processing power and consequently reduces the converter loss. Since the converter is a SII type, this converter has a limited voltage stress on the bulk capacitor and the converter...
This paper presents a detailed performance comparison (including efficiency, EMC performance and component electrical stress) between boost and buck type PFC under critical conduction mode (CRM). In universal input (90-265Vac) applications, the CRM buck PFC has around 1% higher efficiency compared to its counterpart at low-line (90Vac) condition. Due to the low voltage swing of switch, buck PFC has...
In this paper, a two-phase interleaved boost converter with low switch voltage stress and automatic current-sharing capability is proposed for single-phase power factor correction (PFC). First, a forward-type converter is integrated with the first phase to achieve much higher voltage conversion ratio and avoid operating at extreme duty ratio. Then, two capacitors are added as voltage dividers for...
This paper proposes a non-isolated single-stage high power factor rectifier suitable for applications requiring low-voltage and high-current output. The proposed converter integrates two buck-boost converters with a buck converter. As a result, the proposed converter can operate over a wide range of input voltage with extended low output voltage capability, making it suitable for universal input applications...
This paper presents a new single-stage singleswitch (S4) high power factor correction (PFC) AC/DC converter suitable for low power applications (< 150 W) with a universal input voltage range (90-265 Vrms). The proposed topology integrates a buck-boost input current shaper followed by a buck and a buck-boost converter, respectively. As a result, the proposed converter can operate with larger duty...
A passive lossless snubber for boost power factor corrector (PFC) is presented. This snubber has several advantages. First, it does not introduce extra voltage and current stress on the main switch. Second, it provides soft-switching conditions for the main switch over wide input and load range. Third, it limits the turn-on current of the main switch resulting from the reverse recovery current of...
Light-emitting-diode (LED) light sources, which are more compact, capable to change color in real time, less dissipative and more durable, are finding more applications in domestic, commercial and industrial environments. However, requirements such as high power factor, long lifetime, accurate current control and high efficiency pose challenges to the design of LED ballast circuits. This paper proposes...
A single-stage electronic ballast topology with the properties of high efficiency and low stress is proposed in this paper. The ballast consists of a voltage fed half-bridge series-resonant series-parallel-load (SRSPL) inverter, playing the role of lamp driver, and a voltage boost converter, which shares low side switch device with half-bridge inverter and acts as power-factor-correction (PFC). The...
Decades of research have seen single-phase boost-type PWM converters be employed as front-end PFC rectifiers in commercial power supplies. The benefits of employing this technology to comply with power quality standards while assuring high efficiency and low volume and weight have been observed. However, this work shows that further efforts can be driven into new topologies. In this context, a new...
The paper proposes a three-phase, reduced switch, buck-type converter that can operate with input power factor correction. The key feature of the proposed converter is that a switch in the converter has a lower peak voltage stress than a switch in a conventional three-phase, single-switch buck converter. The voltage stress in the proposed converter is limited to the peak value of the phase voltage...
In this paper, two switchable power converters, integrated SEPIC/boost and flyback/boost, are described, analyzed and designed for power factor correction applications with multiple line input voltages (e.g. 120 Vrms and 277 Vrms). The range-selection switch can configure the converter to boost topology at low line input voltages, and to SEPIC or flyback topology at high line input voltage. As a result,...
In three-phase PFC converter, there exist severe switch antiparallel diode reverse recovery problems. The effective measures of compound active-clamping and minimal voltage active-clamping techniques in single phase PFC are extended to three-phase PFC. A family of active-clamping ZVS soft switching PFC converter is derived. They can effectively suppress the diode reverse recovery and realize ZVS for...
In three-phase PFC converter, there exist severe switch antiparallel diode reverse recovery problems. The effective measures of compound active-clamping and minimal voltage active-clamping techniques in single phase PFC are extended to three-phase PFC. A family of active-clamping ZVS soft switching PFC converter is derived. They can effectively suppress the diode reverse recovery and realize ZVS for...
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