# US 12,225,671 B2 · Electronic control unit capable of suppressing an increase in size of a board > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,225,671 B2 - Document ID: US12225671B2 - Status: Granted - Kind: B2 - Application number: 17/642,872 - Filed: 2020-08-14 - Published: 2022-12-15 - Granted: 2025-02-11 - Earliest claimed: 2019-09-26 - Assignees: Hitachi Astemo, Ltd. - Applicants: Hitachi Astemo, Ltd. - Inventors: Tomohiro Fukuda - Web page: https://patentgrep.com/patent/US12225671B2 ## CPC - H05K 5/0069: {having connector relating features for connecting the connector pins with the PCB or for mounting the connector body with the housing} - H05K 7/14322: {wherein the control and power circuits of a power converter are arranged within the same casing} - H05K 1/0207: {using internal conductor planes parallel to the surface for thermal conduction, e.g. power planes} - H05K 1/144: {Stacked arrangements of planar printed circuit boards} - H02M 7/003: {Constructional details, e.g. physical layout, assembly, wiring or busbar connections} - H02M 7/44: by static converters - H05K 2201/0191: wherein the thickness of the dielectric plays an important role - H05K 2201/042: Stacked spaced PCBs; Planar parts of folded flexible circuits having mounted components in between or spaced from each other - H05K 2201/09027: Non-rectangular flat PCB, e.g. circular - H05K 2201/10189: Non-printed connector - 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 An electronic control unit includes a connector, a first board, and a second board. The first board includes an inner-layer conductor. The second board includes an inner-layer conductor and provided with a control circuit. A thickness of the inner-layer conductor of the first board is thicker than a thickness of the inner-layer conductor of the second board. The thickness of the inner-layer conductor of the first board is 1.7 to 2.3 times the thickness of the inner-layer conductor of the second board. ## Claims ### Claim 1 An electronic control unit comprising: a connector including a power supply terminal; a first board including an inner-layer conductor and provided with a power conversion circuit that converts input power input via the power supply terminal into predetermined output power; and a second board including an inner-layer conductor and provided with a control circuit, wherein a thickness of the inner-layer conductor of the first board is thicker than a thickness of the inner-layer conductor of the second board, and wherein the thickness of the inner-layer conductor of the first board is 1.7 to 2.3 times the thickness of the inner-layer conductor of the second board. ### Claim 2 (depends on 1) The electronic control unit according to claim 1, wherein the first board includes a terminal connecting portion to which the power supply terminal is connected, and the second board is disposed between the connector and the first board, and includes an interference avoidance portion that avoids interference with the power supply terminal. ### Claim 3 (depends on 2) The electronic control unit according to claim 2, further comprising: a board attachment portion to which the first board is attached; and a connector attachment portion to which the connector is attached, wherein the power supply terminal is connected to the terminal connecting portion when the connector is attached to the connector attachment portion. ### Claim 4 (depends on 1) The electronic control unit according to claim 1, wherein the connector includes a plurality of control terminals and a plurality of communication terminals connected to the second board, ends of the plurality of control terminals connected to the second board are arranged in a predetermined direction, ends of the plurality of communication terminals connected to the second board are arranged in the predetermined direction, and the ends of the plurality of control terminals connected to the second board and the ends of the plurality of communication terminals connected to the second board are arranged in a straight line in the predetermined direction. ### Claim 5 (depends on 4) The electronic control unit according to claim 4, wherein ends of the plurality of communication terminals on a side opposite to a side connected to the second board are arranged along a specific direction different from the predetermined direction. ### Claim 6 (depends on 1) The electronic control unit according to claim 1, wherein the inner-layer conductor of the first board is made of copper. ### Claim 7 (depends on 6) The electronic control unit according to claim 6, wherein the inner-layer conductor of the second board is made of copper. ### Claim 8 (depends on 1) The electronic control unit according to claim 1, wherein the first board is formed by stacking a cured layer obtained by containing and curing a thermosetting resin, and the inner-layer conductor. ### Claim 9 (depends on 8) The electronic control unit according to claim 8, wherein the second board is formed by stacking a cured layer obtained by containing and curing a thermosetting resin, and the inner-layer conductor. ### Claim 10 (depends on 1) The electronic control unit according to claim 1, wherein the first board includes a plurality of the inner-layer conductors, and all the inner-layer conductors of the first board are thicker than the thickness of the inner-layer conductors of the second board. ### Claim 11 An electronic control unit comprising: a connector including a power supply terminal; a first board including an inner-layer conductor and provided with a power conversion circuit that converts input power input via the power supply terminal into predetermined output power; and a second board including an inner-layer conductor and provided with a control circuit, wherein a thickness of the inner-layer conductor of the first board is thicker than a thickness of the inner-layer conductor of the second board, the connector includes a plurality of control terminals and a plurality of communication terminals connected to the second board, ends of the plurality of control terminals connected to the second board are arranged in a predetermined direction, ends of the plurality of communication terminals connected to the second board are arranged in the predetermined direction, the ends of the plurality of control terminals connected to the second board and the ends of the plurality of communication terminals connected to the second board are arranged in a straight line in the predetermined direction, and ends of the plurality of communication terminals on a side opposite to a side connected to the second board are arranged along a specific direction different from the predetermined direction.