Abstract: A radial compressor for a vehicle air conditioning system includes a cylinder block having an array of radially arranged cylinders. Each cylinder defines a piston receiving bore that is closed by a discharge valve assembly. A piston assembly is received for reciprocation in each bore by a drive assembly that is operatively connected to the engine of the vehicle. The compressor also includes an annular discharge chamber defined between the periphery of the cylinder block and an outer cylindrical shell. Dams extend into the discharge chamber adjacent the side of the bores closest to a single discharge port; that is downstream of the bores. The dams act as baffles to reflect incident pressure waves to reduce gas pulsations, vibrations and noise.

Abstract: A self oscillating converter with regenerative switching includes circuitry to enhance the gain of circuity to turn off a MOSFET power switch and enhance the regenerative action culminating in turn off in order to eliminate bursting at low loads. The MOSFET power switching device turn off circuitry includes the addition of a supplementary drive transistor operative for counteracting the effects of the parasitic capacitances of the MOSFET power switching device. This permits the converter to operate with the shorter on times and to provide a low ripple output at very low load.