Electrical circuit and a method for measuring the power consumption of an LED lighting device

A method for measuring power consumption of an LED lighting device in real time, comprising:

• measuring input voltages and voltage-efficiency curves of the LED lighting device under different input voltage conditions;
• storing, by a controlling unit, the input voltage-efficiency curves of the LED lighting device under different input voltage conditions;
• measuring real time input voltage of the LED lighting device;
• measuring real time output voltage of the LED lighting device;
• measuring real time output current of the LED lighting device;
• determining real time input power of the LED lighting device, by using wherein:
• the real time output current data and the real time output voltage data provide a real time output power, and by referring to previously stored voltage-efficiency curves of the LED lighting device includes a relationship between an efficiency, defined by an output power over an input power, versus the output power, and a real time input power is obtained based on the real time output power and the previously stored voltage-efficiency curves;
• determining the real time power consumption by doing a time integration of the real time input power;
• and displaying, by a display unit, during a light adjustment process of the LED lighting device, the power and power consumption of the LED lighting device in real time, so as to facilitate a user to determine a corresponding action to the LED lighting device if the real time power consumption of the LED lighting device exceeds a threshold value.

A system for measuring power consumption of an LED lighting device in real time, further comprising:

• an LED power supply unit configured to supply power and drive the LED lighting device;
• an LED light source configured to emit light;
• an input voltage sampling unit configured to read real time input voltage data;
• an output voltage sampling unit configured to read real time output voltage data;
• an output current sampling unit configured to read real time output current data;
• a temperature sensor and a humidity sensor attached to the LED lighting device, collecting environmental data related to operations of the LED lighting device in real time;
• a controlling unit configured to calculate a real time power and power consumption of the LED lighting device, by using wherein:
• the real time output current data and the real time output voltage data provide a real time output power, and by referring to previously stored voltage-efficiency curves of the LED lighting device includes a relationship between an efficiency, defined by an output power over an input power, versus the output power, a real time input power is obtained based on the real time output power and the previously stored voltage-efficiency curves, and the real time power consumption is obtained from a time integration of the real time input power;
• a display unit configured, during a light adjustment process of the LED lighting device, to display the real time environment data and the power and power consumption of the LED lighting device, so as to facilitate a user to determine a corresponding action to the LED lighting device if the real time power consumption of the LED lighting device exceeds a threshold value;
• and a RF unit configured to receive and send received data to remote terminals.