| 摘要 |
PURPOSE:To enhance the switching speed of a MOSFET, by feeding back positively a voltage, which is generated between both ends of a load of the MOSFET, to the gate of the MOSFET. CONSTITUTION:When the output level of an inverter 4 is low, a transistor TR9 is turned off, and a high level is applied to the gate of a MOSFET3, and a floating capacity 11 is charged. When the FET3 starts turning on, a voltage is generated between both ends of a load 2 and is fed back positively to the gate of the FET3 through a transformer 8. Consequently, the FET8 is turned on in a high speed. When the output level of the inverter 4 is inverted, the TR9 is turned on, and the floating capacity 11 is discharged, and the voltage between both ends of the load 2 is fed back positively to the gate of the FET3, and the capacity 11 is discharged more rapidly. Sonsequently, the FET3 is turned off in a high speed. |
