STEVAL-DCAC1KCB

STEVAL-DCAC1KCB is a dual-stage digitally controlled DC-AC power inverter evaluation board. The modular design approach makes it easier for the user to test and debug the various sections involved. The system consists of a power inverter board, auxiliary power supply board and a microcontroller board. The DC-DC step-up conversion is based on a full bridge LLC resonant topology, while the DC-AC conversion is based on an H-bridge inverter. The LLC resonant circuit is designed to operate at a fixed resonant frequency without regulating the DC-DC converter output voltage, therefore working in the open-loop operation. The AC output voltage is regulated by varying the modulation index (MI) of the Hbridge stage. The fixed operating frequency of the LLC converter ensures maximum efficiency irrespective of battery voltage and extends the battery back-up time. The DC-DC stage open loop operation also means lower computational load on the microcontroller.

• 1500VA digitally controlled power inverter
• Full bridge LLC + full bridge rectification + H-bridge inverter
• Output voltage: 230V AC ±10%
• Output THD: less than 5% for load greater than 20% of maximum capability (resistive load)
• Input voltage range from 42 to 54V DC
• Efficiency is greater than 93.2% at 50% of load (peak), greater than 92.1% at 100% of load
• Built-in comprehensive safety mechanisms: low and high I/P voltage cutoff and O/P voltage cutoff
• Output over current/over load protection, no-load protection and input reverse polarity protection