Power conversion device

Patent metadata

Field	Value
Publication number	US-12119756-B2
Application number	US-202017913451-A
Country	US
Kind code	B2
Filing date	Apr 20, 2020
Priority date	Apr 20, 2020
Publication date	Oct 15, 2024
Grant date	Oct 15, 2024

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.

First claim

What is claimed is:

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.

2. The power conversion device as claimed in claim 1 , wherein said first circuit is mounted on said first board.

3. 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.

4. 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.

5. 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.

6. The power conversion device as claimed in claim 1 , wherein said first board ( 102 ) is erected on the main circuit board.

7. 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.

8. 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.

9. 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.

10. 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.

11. 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.

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.

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.

14. 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.

Assignees

• Hitachi Industry Equipment Systems Co Ltd

Inventors

• Sato Fumihiro
• Tanabe Keisuke
• Hamano Koji
• Tomiyama Kiyotaka
• Miyazaki Hiroyoshi

Classifications

• H05K2201/044

  Details of backplane or midplane for mounting orthogonal PCBs · CPC title

• H05K1/141

  One or more single auxiliary printed circuits mounted on a main printed circuit, e.g. modules, adapters (H05K1/142 and H05K1/147 take precedence) · CPC title

• H05K1/0213

  Electrical arrangements not otherwise provided for · CPC title

• H02M5/458

  using semiconductor devices only · CPC title

• H05K7/14322

  wherein the control and power circuits of a power converter are arranged within the same casing · CPC title