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This paper presents a novel zero-voltage-switching approach for predictive boundary conduction mode PFC converter for LED lighting. In the proposed method, instead of being detected by a sensing circuit, the switching off-time for achieving zero-voltage-switching is determined by analytical equations of PFC converter. Therefore, the efficiency reduction caused by sensing circuit can be eliminated...
This paper discussed the regulation characteristics of boundary conduction mode PFC converter with a novel zero-crossing point detector. In the conventional method, the zero-crossing point is detected by observing the change of inductor voltage. The detection of zero-crossing point is delayed due to the effect of parasitic capacitors in the main components of PFC converter. The proposed detector can...
This paper presents a novel boundary current mode boost-type PFC converter for driving the light emitting diode lightings. In the PFC converter, a novel method for zero-crossing point of inductor current detecting is proposed. In conventional boundary current mode PFC converter, the zero-crossing point is detected by observing the inductor voltage. The detection of zero-crossing point is delayed by...
A single-stage ac-dc converter consisting of full-bridge converter is proposed for EV charger applications. The proposed approach is superior to conventional two-stage ac-dc converter widely used for EV charger applications. The two stage ac-dc converter is apt to be costly and large. However a single-stage ac-dc converter is suitable to a low cost, small volume due to a reduced number of components...
This paper presents a current sensor-less boundary current mode PFC converter. In particular, the ac-dc converter with a boundary current mode control has the following several advantages. One is that it has the capability to achieve the low input current distortion and the unity power factor can be obtained in theory. Another is that it is possible to reduce the switching loss because the inductor...
The purpose of this paper is to present a influences of parameter deviations on operation of a novel current sensorless AC-DC converter are discussed. The off time is calculated based on the equations of each operating state for boundary current control mode. The relationship among the THD, power factor and efficiency, and circuit parameter errors are discussed. When the circuit parameter varies from...
The purpose of this paper is to present a novel digital control boundary current mode ac-dc converter. The ac-dc converter is widely used as power factor correction. The ac-dc converter that operates in a boundary current mode has the some advantages. It has capability to achieve low current distortion. The unity power factor is theoretically obtained by the boundary current mode control. In the proposed...
The purpose of this paper is to present a new digital control boundary current mode ac-dc converter without a current detector. The ac-dc converter is widely used as power factor correction. The ac-dc converter that operates in a boundary current mode has the some advantages. It has capability to achieve low current distortion. The unity power factor is theoretically obtained by the boundary current...
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