Description
The Microtek V3 Model V18.09 Z-3 (often labeled as SFZ3 V3 HS) is a pre-programmed, 28-pin microcontroller IC specifically designed for Microtek Square Wave Inverters.
It serves as the “brain” of the inverter’s Control Card (PCB), managing the logic for power conversion, battery protection, and user indicators.
Key Technical Specifications
IC Package: 28-Pin Dual In-line Package (DIP).
Compatibility: Designed for Microtek Square Wave models (specifically those without a sensing transformer).
Model/Version: V18.09 Z-3 / SFZ3 V3.
Software: Comes pre-loaded with Microtek’s proprietary firmware (it is not a blank IC).
Core Functions
The IC manages several critical operations within the inverter:
PWM Generation: Controls the MOSFET switching to convert DC battery power into AC.
Battery Management: Monitors for Low Battery (cutoff) and Battery Full (charging stop).
Overload Protection: Shuts down the system if the connected load exceeds capacity.
Mains Sensing: Automatically switches from Battery Mode to Mains Mode when utility power is restored.
LED Indications: Controls the front panel lights for Mains On, Charging, UPS On, Low Battery, and Overload.
