Abstract: A refrigeration system comprises: a compressor, a first heat exchanger, a reservoir, a throttling element and a second heat exchanger in the refrigeration circuit. The refrigeration system comprises a cooling mode and a hot-gas bypass heating mode. In the hot-gas bypass heating mode, the refrigerant leaving the outlet of the compressor is delivered directly to the second heat exchanger before returning to the inlet of the compressor, wherein, the refrigeration system further comprises a branch flow path with a control valve provided thereon. The control valve is capable of being opened or closed in the hot-gas bypass heating mode.

Abstract: A microelectronic device includes a substrate, at least two doped well regions, an epitaxial structure, and at least two power elements. The doped well regions are disposed in the substrate, and are spaced apart from each other. Each of the doped well regions has a doping type opposite to that of the substrate. The epitaxial structure is disposed on the substrate, and is in contact with the doped well regions. The power elements are disposed on the epitaxial structure opposite to the substrate, and are cascade connected with each other. A low potential terminal of each of the power elements is electrically connected to a respective one of the doped well regions. A method for making the microelectronic device is also provided.