Abstract: A refrigeration device includes an indoor unit and an outdoor unit. The indoor unit is used for heat exchange with air inside an equipment room. To adapt to different cabinets, one or more ventilation ducts of the indoor unit include a plurality of channels, and a baffle assembly is disposed in the indoor unit. An air flow direction in the ventilation duct is changed using the baffle assembly, and the baffle assembly is adjusted to block different positions to apply the refrigeration device to different types of cabinets.

Abstract: A direct current (DC)/DC conversion circuit includes an input end, a power circuit, and an output end, a bypass circuit that is a unidirectional conduction circuit, and a switch disposed between the input end and the power circuit, where the input end is configured to be coupled to an external power supply to receive power to the DC/DC conversion circuit. The bypass circuit is coupled between the input end and the power circuit, the bypass circuit is disposed between the switch and the power circuit, and the bypass circuit is coupled to the power circuit in parallel. The switch is configured to be closed when the input end is reversely coupled to the external power supply to enable a current from a positive electrode of the external power supply to flow back to a negative electrode of the external power supply through the bypass circuit and the switch.