| 摘要 |
The present invention is for an active rectifier for use in a DC to DC converter wherein a feedback control circuit activates and de-activates the current conduction between the input and the output. Preferably, the current conductor between the input and the output is a P-type MOSFET, wherein the feedback control circuitry provides the activation or de-activation signal to the gate of this transistor. The feedback control circuitry provides an activation signal to the transistor when the input voltage is greater than the output voltage, and provides a de-activation signal to the transistor when the input voltage is equal to or less than the output voltage. Because the P-MOS rectifier has a lower voltage drop than the Schottky diode, the forward drop is reduced. In addition, the feedback control circuit is designed to draw no current except when the P-MOS rectifier is conducting.
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