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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 suppression method of the switching frequency variation for a hysteretic current mode converter without detecting the inductor current. The renewable energy is difficult to keep the constant output because it is influenced climate change etc. It is need to add the charging system in order to keep the power supply and demand balance. The ac-dc converter is used in the wind power...
This paper presents a current sensor-less hysteretic current mode switching power supply. Switching power supplies are controlled in the voltage mode or the current mode. The current mode converters are used in the power system which requires of high reliability because it has high stability of the feedback loop compared with the voltage mode converter. The current mode converter is necessary to detect...
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...
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