Abstract: A power supply apparatus with input voltage detection includes a power input side and an input detection module. The power input side has a first input terminal and a second input terminal, and the first input terminal and the second input terminal are electrically connected to a live wire and a neutral wire of an AC power source, respectively. The input detection module has two input terminals, which are corresponding electrically connected to the first input terminal and the second input terminal. The input detection module generates a detection signal to shut down the power supply apparatus when the input detection module detects that the live wire or the neutral wire is abnormal, or the live wire and the neutral wire are both abnormal.

Abstract: A power supply apparatus with input voltage detection includes a power input side and an input detection module. The power input side has a first input terminal and a second input terminal, and the first input terminal and the second input terminal are electrically connected to a live wire and a neutral wire of an AC power source, respectively. The input detection module has two input terminals, which are corresponding electrically connected to the first input terminal and the second input terminal. The input detection module generates a detection signal to shut down the power supply apparatus when the input detection module detects that the live wire or the neutral wire is abnormal, or the live wire and the neutral wire are both abnormal.

Abstract: Disclosed is a flyback converter with a synchronous rectifier, in which the synchronous rectifier includes a synchronous switch, a current transformer connected in series between a drain terminal of the synchronous switch and an output terminal, and a secondary synchronous rectification driver connected to the gate terminal of the synchronous switch. Furthermore, a shunt resistor is connected in parallel with the current transformer for providing a current bypass path for a secondary current flowing through the synchronous switch and the current transformer, and thereby reducing the current flowing through the current transformer. Thus, the overall efficiency of the flyback converter can be enhanced and the life of the current transformer can be prolonged.

Abstract: Disclosed is a flyback converter with a synchronous rectifier, in which the synchronous rectifier includes a synchronous switch, a current transformer connected in series between a drain terminal of the synchronous switch and an output terminal, and a secondary synchronous rectification driver connected to the gate terminal of the synchronous switch. Furthermore, a shunt resistor is connected in parallel with the current transformer for providing a current bypass path for a secondary current flowing through the synchronous switch and the current transformer, and thereby reducing the current flowing through the current transformer. Thus, the overall efficiency of the flyback converter can be enhanced and the life of the current transformer can be prolonged.