# US 2018/0027704 A1 · Power conversion device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0027704 A1 - Document ID: US20180027704A1 - Status: Published application - Kind: A1 - Application number: 15/549,821 - Filed: 2015-03-25 - Published: 2018-01-25 - Earliest claimed: 2015-03-25 - Assignees: Mitsubishi Electric Corporation - Applicants: Mitsubishi Electric Corporation - Inventors: Masaru SHINOZAKI; Shigetoshi IPPOSHI; Hiroyuki HIGASHINO; YUGO ASAI; Hiroyuki YANO; Haruyuki MATSUO - Web page: https://patentgrep.com/patent/US20180027704A1 ## CPC - H05K 7/20927: {Liquid coolant without phase change} - H02M 7/003: {Constructional details, e.g. physical layout, assembly, wiring or busbar connections} - H05K 5/03: Covers - H05K 7/209: {Heat transfer by conduction from internal heat source to heat radiating structure (H05K7/20909 takes precedence)} - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) ## Abstract The power conversion device of the invention includes: a cooling unit that is a prism, the interior of which is hollow, and that has a refrigerant inlet portion and a refrigerant outlet portion the cooling unit having in the interior thereof a refrigerant channel through which a refrigerant flows from the refrigerant inlet portion towards the refrigerant outlet portion; electronic devices that are respectively disposed on three or more surfaces on the outside of side surfaces of the cooling unit, excluding a refrigerant inlet surface, in which the refrigerant inlet portion is disposed, and a refrigerant outlet surface, in which the refrigerant outlet portion is disposed, the electronic devices being cooled by boiling of the refrigerant; and a hollow outer case 4 that covers the electronic devices. ## Claims ### Claim 1 A power-conversion device, comprising: a cooling unit that is a prism, the interior of which is hollow, and that has a refrigerant inlet portion and a refrigerant outlet portion, the cooling unit having, in the interior thereof, a refrigerant channel through which a refrigerant flows from the refrigerant inlet portion towards the refrigerant outlet portion; electronic devices that are respectively disposed on three or more surfaces on the outside of side surfaces of the cooling unit excluding a refrigerant inlet surface, in which the refrigerant inlet portion is disposed, and a refrigerant outlet surface, in which the refrigerant outlet portion is disposed, the electronic devices being cooled by boiling of the refrigerant; and a hollow outer case that covers the electronic devices. ### Claim 2 (depends on 1) The power concession device of claim 1, wherein the electronic device of highest heat density or largest amount of heat from among the electronic devices is disposed on the outside of a bottom surface, from among the side surfaces of the cooling unit. ### Claim 3 (depends on 2) The power conversion device of claim 2, wherein plate thickness of the bottom surface, from among the side surfaces, is smaller than that of other side surfaces of the cooling unit. ### Claim 4 (depends on 2) The power conversion device of claim 2, wherein the electronic device of lowest heat density from among the electronic devices is disposed on the outside of a top surface, from among the side surfaces of the cooling unit. ### Claim 5 (depends on 1) The power conversion device of claim 1, wherein one surface of the side surfaces of the cooling unit excluding the refrigerant inlet surface and the refrigerant outlet surface, is configured in the form of a plate-like lid part, such that the cooling unit excluding the lid part, is formed as a body separate from the lid part, with the cooling unit being formed by joining the lid part to the cooling unit excluding the lid part. ### Claim 6 (depends on 1) The power conversion device of claim 1, wherein a fin is provided on the inner side of the top surface, among the side surfaces of the cooling unit. ### Claim 7 (depends on 1) The power conversion device of claim 1, wherein the refrigerant inlet portion and the refrigerant outlet portion are provided on one same surface of the cooling unit, and the cooling unit has a partition that splits the refrigerant channel into a first region that is in contact with the refrigerant inlet portion and into a second region that is in contact with the refrigerant outlet portion; and the partition forms a gap, through which the refrigerant flows, between the partition and the surface of the cooling unit opposing the same surface. ### Claim 8 (depends on 3) The power conversion device of claim 3, wherein the electronic device of lowest density from among the electronic devices is disposed on the outside of a top surface, from among the side surfaces of the cooling unit. ### Claim 9 (depends on 1) The power conversion device of claim 1, wherein from among the electronic devices, the electronic device disposed on the outside of a bottom surface, from among the side surfaces of she cooling unit, is power module. ### Claim 10 (depends on 1) The power conversion device of claim 1, wherein from among the electronic devices, the electronic device disposed on the outside of the side surface is a control circuit or a driving circuit. ### Claim 11 (depends on 1) The power conversion device of claim 1, wherein from among the electronic devices, the electronic device that is disposed on the outside of the side surface is a capacitor or a step-down converter.