Patent ID: 9692292
Date: 2017-06-27
CPC Classifications: H02M

Claim:
1. A power supply apparatus, the power supply apparatus applied to an alternating current power supply apparatus, the alternating current power supply apparatus comprising a line wire and a neutral wire, and comprising: a main power processing circuit; and an alternating current power detection circuit electrically connected to the main power processing circuit, wherein the alternating current power detection circuit comprises: a rectifying unit electrically connected to the main power processing circuit; and a frequency processing unit electrically connected to the main power processing circuit and the rectifying unit, wherein the rectifying unit comprises: a first diode electrically connected to the main power processing circuit, the frequency processing unit and the line wire; and a second diode electrically connected to the main power processing circuit, the frequency processing unit, the neutral wire and the first diode, wherein the first diode and the second diode rectify the alternating current power to obtain the rectified power; when the frequency of the rectified power is greater than twice the predetermined frequency, the frequency processing unit informs the main power processing circuit, so that the main power processing circuit processes the alternating current power to obtain the output direct current power; wherein the rectifying unit rectifies an alternating current power to obtain a rectified power; when a frequency of the rectified power is greater than a predetermined frequency, the frequency processing unit informs the main power processing circuit, so that the main power processing circuit processes the alternating current power to obtain an output direct current power, wherein when the frequency of the rectified power is not greater than the predetermined frequency, the frequency processing unit does not inform the main power processing circuit, so that the main power processing circuit does not process the alternating current power; the output direct current power is not obtained; wherein the frequency processing unit comprises: a high pass filter electrically connected to the main power processing circuit, and a voltage comparator electrically connected to the high pass filter and the rectifying unit, wherein the voltage comparator is used for determining whether a voltage of the rectified power is greater than a predetermined voltage or not; when the voltage of the rectified power is greater than the predetermined voltage, the voltage comparator informs the high pass filter, so that the high pass filter determines whether the frequency of the rectified power is greater than twice of the predetermined frequency or not.