(1PCS) Luminous EcoWatt 675va OLD Refurbished Tested Microcontroller Ic

The Luminous EcoWatt 675 (typically 12V / 600VA–700VA) uses a programmed PIC Microcontroller as its “brain.” Depending on the specific PCB revision (like the common 1116-03 or LB173 boards), the IC is usually a 28-pin through-hole component.

​Core Identity

​Part Family: Generally based on the PIC16F series (e.g., PIC16F886 or PIC16F72/723) but is factory-programmed with Luminous’s proprietary firmware.

​Part Numbers: Often found as 1113912-10, 1116-03, or marked by its software version (e.g., LB173_22).

​Package: 28-Pin DIP (Dual In-line Package) or SMD depending on the age of the model.

​Key Functions

​The Microcontroller IC manages every critical operation of the inverter:

​PWM Generation: It generates the Pulse Width Modulation signals used to drive the MOSFETs, creating the modified or pure sine wave output.

​Mode Switching: Automatically detects “Mains” vs. “Battery” mode. It switches the internal relay to provide power from the battery when the grid fails.

​Intelligent Charging: Monitors battery voltage and regulates the charging current to prevent overcharging (supporting “Eco” and “UPS” modes).

​Protection Logic:

​Overload: Shuts down the system if the load exceeds ~675VA.

​Low Battery: Cuts off power to prevent deep discharge and battery damage.

​Short Circuit: Near-instantaneous trip to protect the internal circuitry.

​Display Control: Drives the LED indicators on the front panel (Mains, Charging, Eco/UPS mode, Low Battery, etc.).