Abstract: A warewash machine for washing wares includes a housing defining a chamber for receiving wares, the chamber having an inlet end, an outlet end, multiple liquid spray zones between the inlet end and the outlet end, and a conveyor for moving wares along a conveyance path through the multiple liquid spray zones in a ware travel direction, the multiple liquid spray zones including a main wash zone and a final rinse zone. An intermediate zone is located, relative to the ware travel direction, after the main wash zone and before the final rinse zone. The intermediate zone includes a blowoff system including multiple blowoff nozzles that direct non-liquid flows onto wares to move residual detergent solution and soils from the wares as the wares move through the intermediate zone. A batch-type machine could also be provided with an intermediate non-liquid blowoff step.

Abstract: Transformers (T1, T2), switches (M1) and (M2), rectifiers (DR1, DR2, DR3, DR4) and low-pass filter (LF, CF) form a basic power train circuit (12). Auxiliary switches (A1, A2), diodes (DS1, DS2) and capacitors (CS1, CS2) form active clamp circuit (10). The capacitances for (CS1, CS2) are chosen large enough such that the voltages (vCS1, vCS2) across the capacitors are essentially constant during several switching cycles. Switches (M1) and (A1) are driven by the signal (V.sub.G1), while switches (M2) and (A2) are driven by (V.sub.G2). When (M1) is turned OFF, the energies stored in the magnetizing and leakage inductances in (T1) will resonate with the output capacitance of (M1) first. When the voltage (V.sub.M1) across (M1) exceeds the voltage (V.sub.CS1) across (CS1), (DS1) conducts and (V.sub.M1) is clamped at (V.sub. CS1), which has a steady-state value of slightly less than two times the input voltage (E). During this interval, the capacitor (CS1) is charged by the leakage inductor current (i.sub.LK1).