Patent ID: 9627922
Date: 2017-04-18
CPC Classifications: G06F,H02J,Y02B

Claim:
1. An active load circuit applicable to a power supply, said power supply comprising a transformer, an output terminal and a detection circuit, said detection circuit being coupled to a secondary side of said transformer to detect a voltage on said secondary side and correspondingly generate a power-good input signal, said active load circuit comprising: a control circuit, coupled to said output terminal, said detection circuit and a ground terminal, said control circuit receiving an output voltage and said power-good input signal via said output terminal and said detection circuit; a dummy load, coupled to said output terminal; and an active switching circuit, coupled to said control circuit, said dummy load and said ground terminal; wherein, when a voltage level of said power-good input signal is lower than a threshold value, said control circuit controls said active switching circuit to enter a load-on mode so that said dummy load is connected to said ground terminal and that said output terminal is connected to said dummy load.