Patent ID: 9735692
Date: 2017-08-15
CPC Classifications: H02M,Y02B

Claim:
1. An adapter with low standby loss supplying power to a load apparatus, the adapter comprising: a rectifying unit; a power factor correction unit electrically connected to the rectifying unit, the power factor correction unit sending out a first voltage; a standby circuit electrically connected to the power factor correction unit, the standby circuit converting the first voltage into a second voltage and a third voltage; a load-connecting detection circuit electrically connected to the standby circuit, the load-connecting detection circuit receiving the second voltage; a first power conversion circuit electrically connected to the power factor correction unit, the first power conversion circuit comprising a first output side and a first ground side, the first ground side electrically connected to the load-connecting detection circuit; a second power conversion circuit electrically connected to the power factor correction unit, the second power conversion circuit comprising a second output side and a second ground side, the second ground side electrically connected to the load-connecting detection circuit, the first ground side and the second ground side connected to different grounds; and an auxiliary voltage control circuit electrically connected to the standby circuit, the first power conversion circuit and the second power conversion circuit, the auxiliary voltage control circuit receiving the third voltage, wherein when the load apparatus is not connected to the adapter, a voltage of the first ground side is different from a voltage of the second ground side, so that the load-connecting detection circuit does not send out a first signal; the auxiliary voltage control circuit does not receive the first signal, so that the auxiliary voltage control circuit does not drive the first power conversion circuit and the second power conversion circuit, so that the first power conversion circuit and the second power conversion circuit does not convert the first voltage into a first output voltage and a second output voltage; wherein when the load apparatus is connected to the adapter, the first ground side is short-circuited to the second ground side, so that the load-connecting detection circuit is turned on and sends out the first signal; after the auxiliary voltage control circuit receives the first signal, the auxiliary voltage control circuit is turned on to send out a fourth voltage to drive the first power conversion circuit and the second power conversion circuit, so that the first power conversion circuit and the second power conversion circuit start to convert the first voltage into the first output voltage and the second output voltage.