1. Technical Field
The present disclosure relates generally to a power supply apparatus and a method of operating the same, and more particularly to a power supply apparatus with input voltage detection and a method of operating the same.
2. Description of Related Art
With the development and progress of science and technology, electronic products with a wide range of different functions have gradually been developed. These electronic products not only meet different demands of users, but also provide more convenient life for the users. Each electronic product includes various electronic components, and the required voltages for supplying different electronic components are usually not the same. In order to provide appropriate voltage levels for normally operating each of the electronic components, the power supply or power conversion unit is used to convert the AC voltage or DC voltage into the appropriate voltage levels. In addition, in order to avoid the malfunction and damage of the power supply or the power conversion unit from the abnormal supply power of the AC power source, it is usually to install a detection circuit at the input side of the power supply or the power conversion unit. Reference is made to FIG. 1 which is a schematic circuit block diagram of a related art input detection circuit for a power supply. The power supply is supplied power by an external AC power source VS, and an AC detection circuit 10A is installed at the input side of the power supply to directly detect whether the external AC power source VS is normal or abnormal.
Reference is made to FIG. 2 which is a schematic view of showing a failed detection of an AC detection circuit of a related art power supply apparatus. When the live wire VSL and the neutral wire VSN are both abnormal, the AC detection circuit 10A generates a signal to a protection circuit of the power supply to provide a protection for the power supply. In particular, the output system 20A, the power supply, and the AC detection circuit 10A are commonly grounded. Once one of the live wire or the neutral wire is abnormal, a loop Ls is formed via the grounding of the AC detection circuit 10A and the output system 20A. Accordingly, the AC detection circuit 10A fails to detect whether the live wire VSL or the neutral wire VSN of the external AC power source VS is abnormal or not. Also, the AC detection circuit 10A does not generate the signal to the protection circuit of the power supply and fail to provide a protection for the power supply.
Accordingly, it is desirable to provide a power supply apparatus with input voltage detection and a method of operating the same to use an input detection module without any grounding or an input detection module with an independent grounding which is different from that of the power supply for detecting whether the AC power source is abnormal or not.