INSULATING ARRANGEMENT FOR DC/AC INVERTER

• US 20060114704A1
• Filed: 11/29/2004
• Published: 06/01/2006
• Est. Priority Date: 11/29/2004
• Status: Active Grant

• Current Assignee: Cotek Electronic Ind. Co. Limited
• Original Assignee: Cotek Electronic Ind. Co. Limited
• Inventors: Chen, Wei-Kuang
• Granted Patent: US 7,042,745 B1
• Time in Patent Office: Days
• US Class Current: 363/144
• CPC Class Codes: H02M 7/003 Constructional details, e.g. physical layout, assembly, wiring or busbar connections
• CPC Class Codes: H05K 7/1432 specially adapted for power drive units or power converters
• CPC Class Codes: H05K 7/14322 wherein the control and power circuits of a power converter are arranged within the same casing

Abstract

A DC-to-AC inverter includes an inverter housing, a power conversion module, and an interference insulating arrangement which includes a DC inlet and an insulating member. The inverter housing has a receiving compartment defining an interference zone within which electromagnetic interference occurs, and a free zone free of electromagnetic interference. The power conversion module includes a main PCB which has a DC-AC inversion circuitry implemented thereon to convert an input DC signal into an output AC signal. The DC inlet is electrically connected to the main PCB for connecting with a DC power source to draw of a DC current as the input DC signal to the main PCB, wherein the CD inlet is located at the free zone of the receiving compartment to insulate the DC inlet from being electromagnetically interfered during a DC to AC conversion at the power conversion module.

Claims

1. An DC-AC inverter, comprising:

an inverter housing having a receiving compartment and defining an interference zone within which electromagnetic interference occurs, and a free zone free of electromagnetic interference;

a power conversion module comprising a main PCB (Print Circuit Board) which has a DC-AC inversion circuitry implemented thereon to convert an input DC signal into an output AC signal and is supported on a bottom wall of said inverter housing within said receiving compartment, wherein a portion of said main PCB is located at said interference zone of said inverter housing and a portion of said main PCB is located at said free zone of said inverter housing; and

an interference insulating arrangement, comprising;

a DC inlet electrically connected to said main PCB for connecting with a DC power source to draw of a DC current as said input DC signal to said main PCB, wherein said CD inlet is located at said free zone of said receiving compartment to insulate said DC inlet from being electromagnetically interfered during a DC to AC conversion at said power conversion module; and

an insulating member disposed between said bottom wall of said inverter housing and said main PCB to insulate said DC inlet with said bottom wall of said inverter housing so as to further minimize said electromagnetic interference of said DC inlet with respect to said inverter housing.

2. The DC-AC inverter, as recited in claim 1, wherein said DC inlet comprises a plurality of conductive members electrically connected with said main PCB and said DC-AC inversion circuitry, wherein said conductive members are supported on a rear portion of said inverter housing for connecting with said DC power source, and extended within said free zone in said inverter housing along said bottom wall thereof for minimizing electromagnetic interference.

3. The DC-AC inverter, as recited in claim 2, wherein each of said conductive members has an end inlet portion mounted at a rear right side of said inverter housing for connecting with said DC power source, and an elongated body portion longitudinally extended along said free zone to electrically connect with said main PCB without being electromagnetically interfered.

4. The DC-AC inverter, as recited in claim 2, wherein each of said end inlet portions has a L-shaped cross section wherein said elongated body portion is downwardly extended from said end inlet portion to extended along said free zone underneath said end inlet portion near said bottom wall of said inverter housing such that electromagnetic field generated by current passage through said elongated body portion is kept to minimum.

5. The DC-AC inverter, as recited in claim 3, wherein each of said end inlet portions has a L-shaped cross section wherein said elongated body portion is downwardly extended from said end inlet portion to extended along said free zone underneath said end inlet portion near said bottom wall of said inverter housing such that electromagnetic field generated by current passage through said elongated body portion is kept to minimum.

6. The DC-AC inverter, as recited in claim 3, wherein said insulating member is embodied as a heat sink which is adapted to extract heat from said receiving compartment of said inverter housing so as to regulate a temperature of said DC inlet in such a manner to prevent said DC inlet from being heated up to increase a resistance thereof which causes a voltage drop along said DC inlet so as to prevent considerable energy loss from said DC-AC inverter.

7. The DC-AC inverter, as recited in claim 4, wherein said insulating member is embodied as a heat sink which is adapted to extract heat from said receiving compartment of said inverter housing so as to regulate a temperature of said DC inlet in such a manner to prevent said DC inlet from being heated up to increase a resistance thereof which causes a voltage drop along said DC inlet so as to prevent considerable energy loss from said DC-AC inverter.

8. The DC-AC inverter, as recited in claim 5, wherein said insulating member is embodied as a heat sink which is adapted to extract heat from said receiving compartment of said inverter housing so as to regulate a temperature of said DC inlet in such a manner to prevent said DC inlet from being heated up to increase a resistance thereof which causes a voltage drop along said DC inlet so as to prevent considerable energy loss from said DC-AC inverter.

9. The DC-AC inverter, as recited in claim 6, wherein said insulating arrangement further comprises a plurality of capacitating devices electrically communicated with said DC inlet for filtering electromagnetic noise formed therein.

10. The DC-AC inverter, as recited in claim 7, wherein said insulating arrangement further comprises a plurality of capacitating devices electrically communicated with said DC inlet for filtering electromagnetic noise formed therein.

11. The DC-AC inverter, as recited in claim 8, wherein said insulating arrangement further comprises a plurality of capacitating devices electrically communicated with said DC inlet for filtering electromagnetic noise formed therein.

12. The DC-AC inverter, as recited in claim 9, wherein said insulating arrangement further comprises a plurality of induction devices wound on said end inlet portion of each of said conductive members, and electrically communicated with said respective capacitating device to form an L-C circuit for each of said conductive members, wherein said L-C circuit is adapted to assist in optimizing electromagnetic noise filtering of said DC inlet.

13. The DC-AC inverter, as recited in claim 10, wherein said insulating arrangement further comprises a plurality of induction devices wound on said end inlet portion of each of said conductive members, and electrically communicated with said respective capacitating device to form an L-C circuit for each of said conductive members, wherein said L-C circuit is adapted to assist in optimizing electromagnetic noise filtering of said DC inlet.

14. The DC-AC inverter, as recited in claim 11, wherein said insulating arrangement further comprises a plurality of induction devices wound on said end inlet portion of each of said conductive members, and electrically communicated with said respective capacitating device to form an L-C circuit for each of said conductive members, wherein said L-C circuit is adapted to assist in optimizing electromagnetic noise filtering of said DC inlet.

15. The DC-AC inverter, as recited in claim 1, wherein said interference zone is formed at a front portion of said inverter housing, where said DC power source is situated nearby for supplying DC said DC-AC inverter, while said free zone is formed at a rear portion of said inverter housing where said DC power source is situated at a distance, so that said free zone is adapted for being free of significant electromagnetic interference.

16. The DC-AC inverter, as recited in claim 2, wherein said interference zone is formed at a front portion of said inverter housing, where said DC power source is situated nearby for supplying DC said DC-AC inverter, while said free zone is formed at a rear portion of said inverter housing where said DC power source is situated at a distance, so that said free zone is adapted for being free of significant electromagnetic interference.

17. The DC-AC inverter, as recited in claim 12, wherein said interference zone is formed at a front portion of said inverter housing, where said DC power source is situated nearby for supplying DC said DC-AC inverter, while said free zone is formed at a rear portion of said inverter housing where said DC power source is situated at a distance, so that said free zone is adapted for being free of significant electromagnetic interference.

18. The DC-AC inverter, as recited in claim 13, wherein said interference zone is formed at a front portion of said inverter housing, where said DC power source is situated nearby for supplying DC said DC-AC inverter, while said free zone is formed at a rear portion of said inverter housing where said DC power source is situated at a distance, so that said free zone is adapted for being free of significant electromagnetic interference.

19. The DC-AC inverter, as recited in claim 17, wherein said insulating member is manufactured by one of insulating PCB, wood, polyester film, glass fibered reinforced matrix composite, and aluminum substrate.

20. The DC-AC inverter, as recited in claim 18, wherein said insulating member is manufactured by one of insulating PCB, wood, polyester film, glass fibered reinforced matrix composite, and aluminum substrate.