| 摘要 |
A protection circuit protects transistors in a DC-DC conversion circuit from an overvoltage. The transistors in the conversion circuit include a first and a second transistor. Converted energy is driven across a transformer by an H-bridge circuit. In a first construction of the H-bridge circuit, a third transistor is turned on to discharge a previously charged inductor. The inductor is coupled to the third transistor. When the inductor is discharged, an output current of the conversion circuit is boosted. A capacitor is charged through a diode. The capacitor and the diode are arranged in the protection circuit. The diode is coupled to the first transistor, and is effective in limiting a voltage across the first transistor when the capacitor is charged. |
