| 摘要 |
<p>The present disclosure provides systems and methods for protecting a switch mode power supply (SMPS). An SMPS may include an input power connector, an input rectifier and filter, a transformer, an output rectifier and filter, and an output power connector. A control circuit may selectively generate a switching signal for driving the transformer based on a feedback signal and a protection signal generated by a protection circuit. The protection circuit may generate the protection signal with an asymmetric duty cycle oscillating between an enable state and an inhibit state. The protection signal may inhibit the control circuit from generating the switching signal when the protection signal is in the inhibit state. A detection circuit may receive the feedback signal and selectively force the protection signal to the enable state when the feedback signal indicates that an output voltage is too high.</p> |
