Power level identification circuit, power level flag circuit and power level supply system

A power level flag circuit, comprising:

• a voltage conversion unit;
• a power interface, connected to the voltage conversion unit, the power interface receiving electrical power from the voltage conversion unit;
• a signal level coding unit, connected to the voltage conversion unit, the signal level coding unit identifying a level of the power output by the voltage conversion unit, and generating signals indicating the level of the power;
• a first isolation unit, connected between the power interface and the voltage conversion unit, the first isolation unit isolating the signals indicating power level in the power interface so that the voltage conversion unit can supply the power via the power interface;
• and
• a second isolation unit, connected between the signal level coding unit and the power interface, the second isolation unit isolating the power in the power interface so that the signal level coding unit can transmit the signals indicating power level via the power interface.

A power level supply system, comprising:

• a power level identification circuit with different modes corresponding to different power levels, the power level identification circuit comprising:
• a first power interface, which receives electrical power and first signals indicating a level of the power;
• a first voltage conversion unit, connected to the first power interface, the first voltage conversion unit receiving the power from the first power interface and converting the power;
• a waveform detection unit, connected to the first power interface, the waveform detection unit filtering the power and obtaining the first signals indicating power level;
• a signal pre-processing unit, connected to the waveform detection unit, the signal pre-processing unit shaping waveforms of the first signals indicating power level and thereby generating second signals indicating power level;
• and
• a processing unit, connected to the signal pre-processing unit, the processing unit identifying a level of the second signals indicating power level and switching to one of the modes of the power level identification circuit corresponding to the identified level of the second signals indicating power level;
• and
• a power level flag circuit, comprising:
• a second voltage conversion unit;
• a second power interface, connected to the first power interface and the second voltage conversion unit, the second power interface receiving the power from the second voltage conversion unit;
• a signal level coding unit, connected to the second voltage conversion unit, the signal level coding unit identifying a level of the power output by the second voltage conversion unit, and generating the first signals indicating power level;
• a first isolation unit, connected between the second power interface and the second voltage conversion unit, the first isolation unit isolating the first signals indicating power level in the second power interface so that the second voltage conversion unit can supply the power via the second power interface;
• and
• a second isolation unit, connected between the signal level coding unit and the second power interface, the second isolation unit isolating the power in the second power interface so that the signal level coding unit can transmit the first signals indicating power level via the second power interface.