Alternating current load detection circuit

An alternating current load detection circuit, comprising:

• a first resistor connected in parallel to a load circuit;
• a diode full bridge circuit connected in series to the load circuit and the first resistor, the diode full bridge circuit including:
• a first diode;
• a second diode having a positive electrode electrically connected to a negative electrode of the first diode, the negative electrode of the first diode and the positive electrode of the second diode are electrically connected to the load circuit;
• a third diode having a negative electrode electrically connected to a positive electrode of the first diode;
• and
• a fourth diode having a positive electrode electrically connected to a negative electrode of the second diode and a negative electrode electrically connected to a positive electrode of the third diode;
• a filter capacitor connected in parallel to the diode full bridge circuit;
• a second resistor;
• and
• a photoelectric coupler connected in parallel to the diode full bridge circuit, the photoelectric coupler connected in series to the second resistor and the diode full bridge circuit connected in parallel to the second resistor.