US Patent No. 10,143,117

HIGH POWER DENSITY DC-AC POWER INVERTER


Patent No. 10,143,117
Issue Date November 27, 2018
Title High Power Density Dc-ac Power Inverter
Inventorship Mu-Chun Lin, Taichung (TW)
Assignee CHYNG HONG ELECTRONIC CO., LTD., Taichung (TW)

Claim of US Patent No. 10,143,117

1. A high power density DC-AC power inverter, mounted to a rack, the high power density DC-AC power inverter comprising: a casing, corresponding in size to the rack and having a rectangular shape, a front side of the casing being formed with a plurality of air inlets, a rear side of the casing being formed with a plurality of air outlets, a bottom of the casing being provided with a bottom plate; a fan unit, disposed at one side of the casing, for guiding outside cold air to enter the casing via the air inlets and discharge to the outside via the air outlets in a guide direction; a heat sink, disposed in the casing, the heat sink including a plurality of spaced fins, the fins each having a long side parallel to the guide direction; a plurality of power elements, each having a heat dissipation surface, the heat dissipation surfaces of the power elements being laterally attached to the heat sink; a circuit board module, laterally disposed above the heat sink and electrically connected with the power elements; when the power inverter is actuated, the power elements generate heat and the heat is conducted to the fins of the heat sink via a shortest route, the fan unit guides the outside cold air into the casing via the air inlets of the casing to pass through the fins of the heat sink for heat dissipation, and the heat is expelled out of the casing via the air outlets of the casing; a wind scooper disposed in the casing, the wind scooper being located between the fan unit and the heat sink, the wind scooper having a guide entrance adjacent to the fan unit and a guide exit adjacent to the heat sink for guiding the outside air from the air inlets to the fins of the heat sink, the wind scooper further having a plurality of guide holes adjacent to the power elements, the guide holes being located above the heat sink, the guide entrance of the wind scooper being greater than the guide exit and the guide holes, the guide exit being greater than the guide holes; and a choke coil module disposed in the casing, the choke coil module including a retainer, the retainer including an upper plate and a lower plate which are laterally disposed, the lower plate being fixed to a bottom of the casing.