# US 12,119,756 B2 · 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 12,119,756 B2 - Document ID: US12119756B2 - Status: Granted - Kind: B2 - Application number: 17/913,451 - Filed: 2020-04-20 - Published: 2023-05-04 - Granted: 2024-10-15 - Earliest claimed: 2020-04-20 - Assignees: Hitachi Industrial Equipment Systems Co., Ltd. - Applicants: Hitachi Industrial Equipment Systems Co., Ltd. - Inventors: Fumihiro Sato; Keisuke Tanabe; Koji Hamano; Kiyotaka Tomiyama; Hiroyoshi Miyazaki - Web page: https://patentgrep.com/patent/US12119756B2 ## CPC - H02M 3/33507: {with automatic control of the output voltage or current, e.g. flyback converters (H02M3/33561, H02M3/33569 take precedence)} - H02M 7/003: {Constructional details, e.g. physical layout, assembly, wiring or busbar connections} - H02M 1/0006: {Arrangements for supplying an adequate voltage to the control circuit of converters} - H02M 1/007: {Plural converter units in cascade (push-pull DC/DC converters with pre-regulator H02M3/3374; DC-AC converters following a DC-DC stage including a high frequency transformer H02M7/4807; DC-AC converters following a DC-DC conversion stage generating periodically varying voltages H02M7/4826)} - H02M 3/003: {Constructional details, e.g. physical layout, assembly, wiring or busbar connections} - H02M 5/458: using semiconductor devices only - H02M 7/5387: in a bridge configuration - H05K 1/0213: {Electrical arrangements not otherwise provided for} - H05K 1/141: {One or more single auxiliary printed circuits mounted on a main printed circuit, e.g. modules, adapters (H05K1/142 and H05K1/147 take precedence)} - H05K 7/14322: {wherein the control and power circuits of a power converter are arranged within the same casing} - H05K 2201/044: Details of backplane or midplane for mounting orthogonal PCBs - 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) - H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS ## Abstract Provided is a power conversion device which comprises a main circuit board, a first board, and a second board and which has a reduced size. The main circuit board has a rectifier circuit and an inverter circuit which are disposed in a high-power section, the rectifier circuit rectifying AC voltage and The second board is provided with a The first board is connected to the main circuit board and to the second board, and is provided with: a first circuit disposed in a low-power section. The second board is provided with a second circuit disposed in a low-power section. section from each other in a reinforced manner; an insulating transformer disposed in the reinforced insulation region and constituting a constituent component of a power supply circuit for receiving the DC voltage and supplying power to the first circuit and to the second circuit; and an insulating element disposed in the reinforced insulation region and allowing a signal to be exchanged between the first circuit and the second circuit. ## Claims ### Claim 1 A power conversion device, having a main circuit board (101), a first board (102), and a second board (103), comprising: a first circuit (125) located in a high-power section; wherein said main circuit board (101) has a rectifier circuit (111) that rectifies AC voltage and outputs DC voltage, and an inverter circuit (113) that inverts said DC voltage and outputs AC power, in said high-power section; wherein said second board (102) has a second circuit (131) located in a low-power section, wherein said first board (102) is connected to said main circuit board (101) and said second board (103), wherein said first board (102) has a reinforced insulation area for reinforcing and insulating said high-power section and said low-power section; an isolation transformer (124), which is located in said reinforced insulation area and is a component of a power supply circuit (123) that receives said DC voltage and supplies power to said first and second circuits, and an insulating element, disposed in said reinforced insulation area, transfers signals between said first circuit (125) and said second circuit (131), wherein said power conversion device further comprises heat dissipating fins for cooling the inverter circuit, and a module case fixed to said heat radiation fins and having an opening that matches the shape of the inverter circuit. ### Claim 2 (depends on 1) The power conversion device as claimed in claim 1, wherein said first circuit is mounted on said first board. ### Claim 3 (depends on 1) The power conversion device as claimed in claim 1, wherein said first circuit is a drive circuit (125) that outputs drive signals to said inverter circuit. ### Claim 4 (depends on 1) The power conversion device as claimed in claim 1, wherein said second circuit (131) is a communication circuit that transfers signals to and from an external device. ### Claim 5 (depends on 1) The power conversion device as claimed in claim 1, further comprising: a third board (104) connected to the main circuit board (101), said first circuit (125) is a drive circuit mounted on the third board that outputs drive signals to the inverter circuit. ### Claim 6 (depends on 1) The power conversion device as claimed in claim 1, wherein said first board (102) is erected on the main circuit board. ### Claim 7 (depends on 1) The power conversion device as claimed in claim 1, wherein said power conversion device further comprises, a first fixing means for contacting both said main circuit board and said first board and fixing said main circuit board and said first board, any three or more of said heat dissipating fins, said module case, said first fixing means, and the main circuit board are co-tightened with a same screw. ### Claim 8 (depends on 1) The power conversion device as claimed in claim 1, wherein said power conversion device further comprises, a body case configured to be joined to said module case, and wherein said main body case is equipped with a second fixing means for fixing the first board. ### Claim 9 (depends on 1) The power conversion device according to claim 1, wherein said power conversion device further comprises: a fourth board (105) connected horizontally to said second board, the third board is connected horizontally to the fourth board, a module case is fixed to said heat dissipation fins and has opening that matches the shape of the inverter circuit, a body case configured to be joined to the module case, and a front cover configured to be joined to the body case, wherein said front cover is equipped with a third fixing means for fixing the fourth board. ### Claim 10 (depends on 6) The power conversion device as claimed in claim 6, wherein said first board (102) is located on the side of the main circuit board opposite the side on which the inverter circuit (113) is mounted. ### Claim 11 (depends on 6) The power conversion device as claimed in claim 6, further comprising a first fixing means for contacting both said main circuit board and said first board and fixing said main circuit board and said first board. ### Claim 12 A power conversion device, having a main circuit board, a first board, and a second board, comprising: a first circuit located in a high-power section; wherein said main circuit board has a rectifier circuit that rectifies AC voltage and outputs DC voltage, and an inverter circuit that inverts said DC voltage and outputs AC power, in said high-power section; wherein said second board has a second circuit located in a low-power section, wherein said first board is connected to said main circuit board and said second board, wherein said first board has a reinforced insulation area for reinforcing and insulating said high-power section and said low-power section; an isolation transformer, which is located in said reinforced insulation area and is a component of a power supply circuit that receives said DC voltage and supplies power to said first and second circuits, and an insulating element, disposed in said reinforced insulation area, transfers signals between said first circuit and said second circuit; wherein said first board (102) is erected on the main circuit board, wherein said main circuit board is equipped with a terminal block to receive the AC voltage, and wherein said first board faces the side of said terminal block. ### Claim 13 A power conversion device, having a main circuit board, a first board, and a second board, comprising: a first circuit located in a high-power section; wherein said main circuit board has a rectifier circuit that rectifies AC voltage and outputs DC voltage, and an inverter circuit that inverts said DC voltage and outputs AC power, in said high-power section; wherein said second board has a second circuit located in a low-power section, wherein said first board is connected to said main circuit board and said second board, wherein said first board has a reinforced insulation area for reinforcing and insulating said high-power section and said low-power section; an isolation transformer, which is located in said reinforced insulation area and is a component of a power supply circuit that receives said DC voltage and supplies power to said first and second circuits, and an insulating element, disposed in said reinforced insulation area, transfers signals between said first circuit and said second circuit; wherein said first and second boards are arranged vertically, and the second board faces the main circuit board. ### Claim 14 (depends on 13) The power conversion device as claimed in claim 13, wherein said power conversion device further comprises a fourth board connected horizontally to said second board, said fourth board comprising at least one of an operation unit for operating the inverter circuit and or a display unit for outputting the operating status of the inverter circuit.