| 摘要 |
<p>The fault current detecting circuit includes: a current detection unit (200) that outputs a current detection signal; a first comparing circuit unit (300) that compares the current detection signal with a predetermined reference current value and outputs a first output signal; a differentiator (400) that differentiates the current detection signal to output a change slope of the current detection signal; a second comparing circuit unit (500) that compares the change slope with a predetermined reference change slope value and outputs a second output signal; a third comparing circuit unit (700) that compares the current detection signal with a predetermined current detection limit reference value and outputs a third output signal; and a trip determining unit (600) that outputs a trip control signal only when the first output signal and the second output signal are maintained to be received and the third output signal is not received.</p> |
