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Traditional voltage sensing method has already been widely used for the synchronous rectifier. However, the parasitic parameters will cause the false turn-on and early turn-off problem. In this paper, the conception of zero-crossing noise filter is presented. By applying this filter to the synchronous rectifier, the false turn-on and early turnoff problem can be resolved. Only three passive components...
A new driving method for SR is presented. By applying a zero-crossing noise filter to the MOSFET, the false-triggering of the SR can be effectively eliminated. Moreover, the resistor and the capacitor in the filter can be used as a compensator to solve the duty cycle loss issue caused by the trace inductance of the MOSFET package. Only three passive components are needed in the proposed filter which...
This paper proposes a new Current Source Driver (CSD) with discontinuous inductor current. Compared to other CSDs proposed in the previous work, the most important advantage of the proposed CSD is the small inductance (typically, 20 nH at 1 MHz switching frequency). This translates into the footprint reduction of as much as 90%. Other features of the proposed CSD includes: 1) fast switching speed...
In this paper, a novel self-driven zero-voltage-switching (ZVS) non-isolated full bridge (FB) converter is presented for 12 V input VRM application. Existing multiphase buck controller and buck driver can be directly used in the proposed converter. The advantages of the proposed converter are: (1) duty cycle extension; (2) significant switching losses reduction due to ZVS of all the control MOSFETs;...
This paper presents a new non-isolated asymmetrical buck converter. The transformer is used to extend the extremely low duty-cycle of a conventional buck converter. The turn-off loss can be significantly reduced due to the extension of duty-cycle and there is no turn-on loss owing to zero-voltage turn-on condition. At the same time, the voltage stress over the synchronous rectifier (SR) MOSFETs is...
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