Clamping Voltage Control Strategy for the Actively Clamped Resonant DC-Link Inverter

The efficiency and life expectancy of PV grid-tie micro-inverter is of critical effect to its performance. The Actively Clamped Resonant DC-link Inverter has remarkable features of simple structure and high efficiency with only one auxiliary switch. The short-circuit control is the traditional clamp circuit control strategy. But the short-circuit process increases the DC-link losses and the control complexity. A no short-circuit control strategy is presented to overcome the above problems. The calculation results show that no short-circuit control strategy reduces the loss of inverter. Film capacitor is chosen to be the clamp capacitor.