# US 12,604,440 B2 · Lower module of power electronic device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,604,440 B2 - Document ID: US12604440B2 - Status: Granted - Kind: B2 - Application number: 18/272,155 - Filed: 2021-12-03 - Published: 2024-05-02 - Granted: 2026-04-14 - Earliest claimed: 2021-01-13 - Assignees: Ls Electric Co., Ltd. - Applicants: Ls Electric Co., Ltd. - Inventors: Soo Yong Hwang; Kil Ju Jung; Su Hyeong Lee; Won Suk Choi; Kyu Hwa Kim - Web page: https://patentgrep.com/patent/US12604440B2 ## CPC - H05K 7/20909: {Forced ventilation, e.g. on heat dissipaters coupled to components} - H05K 7/20918: {the components being isolated from air flow, e.g. hollow heat sinks, wind tunnels or funnels} - H02M 1/327: {against abnormal temperatures} - H02M 7/003: {Constructional details, e.g. physical layout, assembly, wiring or busbar connections} - 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 A lower module of a power electronic device includes a lower module included in a power electronic device that is divided into an upper module and a lower module by an intermediate plate and comprises a blower fan to introduce air into the inner space of the lower module; a plurality of capacitors installed in a suspended form on the intermediate plate and spaced apart from the blower fan; a heat sink having a plurality of heat dissipation fins through which heat generated from a heating component disposed on the upper module is conducted, and disposed adjacent to the capacitors to cool the plurality of heat dissipation fins by air moved from the plurality of capacitors; a DC reactor cooled by the air moved from the heat dissipation fins; and a discharge plate having a vent hole to discharge the air moved from the DC reactor to the outside. ## Claims ### Claim 1 A lower module included in a power electronic device divided into an upper module and a lower module by an intermediate plate, the lower module comprising: a blower fan installed on a first side surface of the lower module to introduce air into an inner space of the lower module from outside of the lower module; a plurality of capacitors installed in a suspended form on the intermediate plate and spaced apart from the blower fan by a predetermined distance; a heat sink having a plurality of heat dissipation fins through which heat generated from a heating component disposed on the upper module is conducted, and disposed adjacent to the plurality of capacitors to cool the plurality of heat dissipation fins by air moved from the plurality of capacitors; a Direct Current (DC) reactor disposed between a first side of the lower module and a second side opposite to the first side and cooled by the air moved from the plurality of heat dissipation fins; and a discharge plate disposed on a second side surface of the lower module and having a vent hole so as to discharge the air moved from the DC reactor to outside, wherein the air passes through the blower fan, the plurality of capacitors, the heat sink, the DC reactor, and the discharge plate, in order, to be then discharged to the outside after heat exchange, wherein an end of a heat dissipation fin of the plurality of heat dissipation fins is in contact with a base surface of the lower module, thereby allowing heat to be conducted from the heat dissipation fin to the base surface. ### Claim 2 (depends on 1) The lower module of a power electronic device of claim 1, wherein at least a portion of a capacitor of the plurality of capacitors, the heat sink, and the DC reactor are disposed to overlap with each other when viewed from the first side surface or the second side surface of the lower module. ### Claim 3 (depends on 2) The lower module of a power electronic device of claim 2, wherein the DC reactor is disposed not to deviate from the heat sink with respect to a height direction of the lower module. ### Claim 4 (depends on 1) The lower module of a power electronic device of claim 1, wherein the predetermined distance at which capacitors of the plurality of capacitors are spaced apart from the blower fan is within a thickness of the blower fan. ### Claim 5 (depends on 1) The lower module of the power electronic device of claim 1, wherein at least four capacitors of the plurality of capacitors are spaced apart from each other along a width direction of the lower module, so that at least three air movement passages are formed between the at least four capacitors. ### Claim 6 (depends on 1) The lower module of the power electronic device of claim 1, wherein the heat dissipation fin extends to a position adjacent to a base surface of the lower module. ### Claim 7 (depends on 6) The lower module of the power electronic device of claim 6, wherein the plurality of heat dissipation fins are disposed to be perpendicular to the discharge plate and parallel to each other, and have a thickness of at least 1 mm to be formed by an extrusion process. ### Claim 8 (depends on 1) The lower module of the power electronic device of claim 1, wherein the DC reactor comprises: a main body fixed to a base surface of the lower module; a connection line extending from the main body and connected to a side of the upper module; and a connection line housing having a first end connected to the main body and a second end fixed to the intermediate plate or the upper module, and having a space through which the connection line passes inside to protect the connection line. ### Claim 9 (depends on 8) The lower module of the power electronic device of claim 8, wherein a fixing member detachably coupled to the intermediate plate or electronic components included in the upper module is provided at the second end of the connection line housing. ### Claim 10 A lower module included in a power electronic device divided into an upper module and a lower module by an intermediate plate, the lower module comprising: a blower fan installed on a first side surface of the lower module to introduce air into an inner space of the lower module from outside of the lower module; a plurality of capacitors installed in a suspended form on the intermediate plate and spaced apart from the blower fan by a predetermined distance; a heat sink having a plurality of heat dissipation fins through which heat generated from a heating component disposed on the upper module is conducted, and disposed adjacent to the plurality of capacitors to cool the plurality of heat dissipation fins by air moved from the plurality of capacitors; a Direct Current (DC) reactor disposed between a first side of the lower module and a second side opposite to the first side and cooled by the air moved from the plurality of heat dissipation fins; and a discharge plate disposed on a second side surface of the lower module and having a vent hole so as to discharge the air moved from the DC reactor to outside, wherein the air passes through the blower fan, the plurality of capacitors, the heat sink, the DC reactor, and the discharge plate, in order, to be then discharged to the outside after heat exchange, wherein at least four capacitors of the plurality of capacitors are spaced apart from each other along a width direction of the lower module, so that at least three air movement passages are formed between the at least four capacitors. ### Claim 11 A lower module included in a power electronic device divided into an upper module and a lower module by an intermediate plate, the lower module comprising: a blower fan installed on a first side surface of the lower module to introduce air into an inner space of the lower module from outside of the lower module; a plurality of capacitors installed in a suspended form on the intermediate plate and spaced apart from the blower fan by a predetermined distance; a heat sink having a plurality of heat dissipation fins through which heat generated from a heating component disposed on the upper module is conducted, and disposed adjacent to the plurality of capacitors to cool the plurality of heat dissipation fins by air moved from the plurality of capacitors; a Direct Current (DC) reactor disposed between a first side of the lower module and a second side opposite to the first side and cooled by the air moved from the plurality of heat dissipation fins; and a discharge plate disposed on a second side surface of the lower module and having a vent hole so as to discharge the air moved from the DC reactor to outside, wherein the air passes through the blower fan, the plurality of capacitors, the heat sink, the DC reactor, and the discharge plate, in order, to be then discharged to the outside after heat exchange, wherein the DC reactor comprises: a main body fixed to a base surface of the lower module; a connection line extending from the main body and connected to a side of the upper module; and a connection line housing having a first end connected to the main body and a second end fixed to the intermediate plate or the upper module, and having a space through which the connection line passes inside to protect the connection line.