Power detection and transmission circuit coupling analog input signal on primary side to secondary side for power information calculation and related power supply apparatus

A power detection and transmission circuit, comprising:

• a first conversion circuit, for detecting an input voltage signal and an input current signal of a power supply module, converting the input voltage signal to a first pulse width modulation (PWM) signal, and converting the input current signal to a second PWM signal, wherein the input voltage signal and the input current signal have the same phase;
• a second conversion circuit, for converting a third PWM signal to a first analog regenerated signal, converting a fourth PWM signal to a second analog regenerated signal, and transmitting the first analog regenerated signal and the second analog regenerated signal to a microcontroller, wherein the microcontroller calculates power information of the power supply module according to the first analog regenerated signal and the second analog regenerated signal;
• and
• a signal coupling circuit, coupled between the first conversion circuit and the second conversion circuit, the signal coupling circuit arranged for coupling the first PWM signal to the second conversion circuit and accordingly generating the third PWM signal, and coupling the second PWM signal to the second conversion circuit and accordingly generating the fourth PWM signal.

A power supply apparatus, comprising:

• a power supply module, comprising an electromagnetic interference filter, a rectifier circuit, a power factor correction circuit and a DC/DC converter circuit;
• a power detection and transmission circuit, comprising:
• a first conversion circuit, electrically connected to the power supply module to receive an analog input signal, the first conversion circuit arranged for converting the analog input signal to a first pulse width modulation (PWM) signal;
• a second conversion circuit, for converting a second PWM signal to an analog regenerated signal;
• and
• a signal coupling circuit, coupled between the first conversion circuit and the second conversion circuit, the signal coupling circuit arranged for coupling the first PWM signal to the second conversion circuit and accordingly generating the second PWM signal;
• and
• a microcontroller, coupled to the second conversion, the microcontroller arranged for receiving the analog regenerated signal to calculate power information of the power supply module.