| 摘要 |
本发明公开了一种用于保护功率开关的短路保护电路及其开关电源和保护方法。短路保护电路的第一输入端耦接功率开关的第一端，短路保护电路的第二输入端耦接功率开关的第二端，短路保护电路的输出端提供短路保护信号，其中短路保护电路包含一电晶体，电晶体具有一阈值电压；当且仅当功率开关导通时，短路保护电路将功率开关第一端和第二端之间的差值电压与电晶体的阈值电压相比较；以及当差值电压大于电晶体的阈值电压时，短路保护信号变换为有效状态用于关断功率开关。本发明公开的短路保护电路及其开关电源和保护方法，具有电路简单、精度要求低、反应快、可靠性高等优点。; the short protection circuit is configured to compare a differential voltage between the first end of the power switch and the second end of the power switch, to the threshold voltage of the transistor only when the power switch is in an ON state; and wherein when the differential voltage is higher than the threshold voltage, the short protection signal transits in an effective state configured to turn off the power switch. |
