Power level acquisition circuit and apparatus

A power acquisition apparatus, characterized in comprising a power acquisition circuit which comprises:

• an alternating current-direct current (AC-DC) conversion unit;
• an acquisition unit;
• a processing unit;
• a power isolation unit;
• and
• a communication isolation unit,
• wherein
• an input terminal of the AC-DC conversion unit is connected to an alternating current power supply, and an output terminal of the AC-DC conversion unit is connected to an input terminal of the power isolation unit and a power terminal of the processing unit, for converting an alternating current to a direct current and inputting the direct current to the power isolation unit and the power terminal of the processing unit;
• a sampling terminal of the acquisition unit is connected to the alternating current power supply for sampling the alternating current;
• an output terminal of the power isolation unit is connected to a power terminal of the acquisition unit for isolating a current between the acquisition unit and the processing unit;
• and
• the communication isolation unit is connected between a communication terminal of the acquisition unit and a communication terminal of the processing unit for isolating a current when the acquisition unit and the processing unit are in communication,
• wherein
• the acquisition unit comprises an acquisition chip, a voltage divider resistor, a non-isolation current acquisition unit, and a sampling resistor,
• a terminal of the voltage divider resistor is connected to a phase line of the alternating current, and the other terminal of the voltage divider resistor is connected to a voltage acquisition terminal of the acquisition chip, for acquiring a voltage, and
• a terminal of the non-isolation current acquisition unit is connected to the phase line of the alternating current, another terminal of the non-isolation current acquisition unit is connected to a terminal of the sampling resistor, and the other terminal of the sampling resistor is connected to a current acquisition terminal of the acquisition chip, for acquiring a current.