GB2057763A - Rectifier assembly - Google Patents
Rectifier assembly Download PDFInfo
- Publication number
- GB2057763A GB2057763A GB8028668A GB8028668A GB2057763A GB 2057763 A GB2057763 A GB 2057763A GB 8028668 A GB8028668 A GB 8028668A GB 8028668 A GB8028668 A GB 8028668A GB 2057763 A GB2057763 A GB 2057763A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rectifier assembly
- heat sink
- diodes
- tabs
- rectifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000007704 transition Effects 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 238000009434 installation Methods 0.000 claims abstract description 4
- 239000004020 conductor Substances 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 3
- 235000019628 coolness Nutrition 0.000 claims 1
- 230000001419 dependent effect Effects 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 3
- 239000013078 crystal Substances 0.000 description 5
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000000153 supplemental effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of semiconductor or other solid state devices
- H01L25/03—Assemblies consisting of a plurality of semiconductor or other solid state devices all the devices being of a type provided for in a single subclass of subclasses H10B, H10F, H10H, H10K or H10N, e.g. assemblies of rectifier diodes
- H01L25/10—Assemblies consisting of a plurality of semiconductor or other solid state devices all the devices being of a type provided for in a single subclass of subclasses H10B, H10F, H10H, H10K or H10N, e.g. assemblies of rectifier diodes the devices having separate containers
- H01L25/11—Assemblies consisting of a plurality of semiconductor or other solid state devices all the devices being of a type provided for in a single subclass of subclasses H10B, H10F, H10H, H10K or H10N, e.g. assemblies of rectifier diodes the devices having separate containers the devices being of a type provided for in subclass H10D
- H01L25/115—Assemblies consisting of a plurality of semiconductor or other solid state devices all the devices being of a type provided for in a single subclass of subclasses H10B, H10F, H10H, H10K or H10N, e.g. assemblies of rectifier diodes the devices having separate containers the devices being of a type provided for in subclass H10D the devices being arranged next to each other
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/04—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for rectification
- H02K11/049—Rectifiers associated with stationary parts, e.g. stator cores
- H02K11/05—Rectifiers associated with casings, enclosures or brackets
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/40—Mountings or securing means for detachable cooling or heating arrangements ; fixed by friction, plugs or springs
- H01L23/4006—Mountings or securing means for detachable cooling or heating arrangements ; fixed by friction, plugs or springs with bolts or screws
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/40—Mountings or securing means for detachable cooling or heating arrangements ; fixed by friction, plugs or springs
- H01L23/4006—Mountings or securing means for detachable cooling or heating arrangements ; fixed by friction, plugs or springs with bolts or screws
- H01L2023/4018—Mountings or securing means for detachable cooling or heating arrangements ; fixed by friction, plugs or springs with bolts or screws characterised by the type of device to be heated or cooled
- H01L2023/4031—Packaged discrete devices, e.g. to-3 housings, diodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/40—Mountings or securing means for detachable cooling or heating arrangements ; fixed by friction, plugs or springs
- H01L23/4006—Mountings or securing means for detachable cooling or heating arrangements ; fixed by friction, plugs or springs with bolts or screws
- H01L2023/4037—Mountings or securing means for detachable cooling or heating arrangements ; fixed by friction, plugs or springs with bolts or screws characterised by thermal path or place of attachment of heatsink
- H01L2023/405—Mountings or securing means for detachable cooling or heating arrangements ; fixed by friction, plugs or springs with bolts or screws characterised by thermal path or place of attachment of heatsink heatsink to package
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/40—Mountings or securing means for detachable cooling or heating arrangements ; fixed by friction, plugs or springs
- H01L23/4006—Mountings or securing means for detachable cooling or heating arrangements ; fixed by friction, plugs or springs with bolts or screws
- H01L2023/4037—Mountings or securing means for detachable cooling or heating arrangements ; fixed by friction, plugs or springs with bolts or screws characterised by thermal path or place of attachment of heatsink
- H01L2023/4062—Mountings or securing means for detachable cooling or heating arrangements ; fixed by friction, plugs or springs with bolts or screws characterised by thermal path or place of attachment of heatsink heatsink to or through board or cabinet
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Synchronous Machinery (AREA)
Abstract
A rectifier assembly for installing generators is of asymmetrical construction, that is to say, a second heat sink (12') directly connected to the generator housing, which thereby acts as a supplementary heat sink, is smaller than the first heat sink (11') which is insulated from the generator housing. A rectifier assembly of this kind having diodes (14, 15) on the heat sinks is particularly suitable for installation in three-phase generators for motor vehicles. Angled tabs (21') are stamped from rim portions of the heat sinks and from apertures (22') in an arcuate transition between the body of the heat sink and an axially directed extension. The tabs and the apertures promote the flow of the generator cooling air over the diodes (14, 15) and the heat sinks. <IMAGE>
Description
SPECIFICATION
Rectifier assembly
The invention relates to a rectifier assembly having diodes arranged on positive and negative heat sinks.
German Patent No. 1 943 333 describes a rectifier assembly for a three phase generator.
The assembly comprises two heat sinks of substantially equal size. The heat sinks are disposed in a plane at right angles to the generator shaft, and the electrical connections of the free electrode terminals of the diodes on the heat sinks are connected by way of conductors which are injection-moulded in an insulating plate. This known rectifier assembly is adequate for generators for motor vehicles.
Similar rectifier assemblies are used for commercial vehicles although, owing to the higher generator output required, each heat sink includes a plurality of parallel-connected rectifier diodes per phase. In order to be able to dissipate the heat due to power loss occurring in the rectifier diodes, one also frequently uses a three heat sink system, the heat sinks being in this case electrically connected to the phase windings of the generator.
In order to prevent the admissible crystal temperature from being exceeded in the diodes, the heat sinks used must be of a minimum size. In the case of a parallel combination of diodes, special care must be taken to ensure that the parallel-connected diodes have the same crystal temperature, since, with differing crystal temperatures, one of the two diodes can be destroyed as a result of overload, and the other diode is then also necessarily destroyed. In the case of a heat sink which is secured directly to the generator housing, a large proportion of the heat is dissipated by heat transfer to the generator housing. This heat sink is thereby cooled to a greater extent than the other heat sink which is cooled only by thermal radiation and convection to the stream of cooling air.
All these structural conditions and problems to be taken into account hitherto meant that relatively large rectifier assemblies had to be used.
The present invention provides a rectifier assembly for installation in a generator, which assembly has an opening through which the generator shaft passes and comprises a first heat sink with one set of diodes thereon and a second heat sink with another set of diodes thereon, the second heat sink being in thermal contact with a supplementary heat sink, and having a smaller cooling surface than the first heat sink.
This has the advantage that all the power diodes have substantially the same crystal temperature and that, moreover, the crystal temperature can be perceptibly decreased.
Furthermore, the rectifier assembly can be of smaller construction for a given output. A subtantial saving of costs is possible.
A special advantage with respect to assembly and costs is that fewer power diodes may be needed. A further improvement in the cooling of the insides of the heat sinks and of the ends of the coil of the generator can be achieved by individual measures such as the stamping-out of tabs from the heat sinks and the provision of apertures in the heat sinks.
The invention is further described, by way of example, with reference to the drawings, in which:~
Figure 1 shows a rectifier assembly viewed from the heat sink side,
Figure 2 shows the rectifier assembly viewed from the insulating plate side,
Figure 3 is a view of the smaller of the two heat sinks, before the rectifying diodes have been fitted,
Figure 4 is a section on the line D-E of Fig.
3,
Figure 5 is a view of the larger of the two heat sinks,
Figure 6 is a section on the line A-B of Fig.
5,
Figure 7 is a side elevation of the larger heat sink of Figs. 5 and 6, and
Figures 8, 9 and 10 are views, similar to
Figs. 1, 3 and 4 but showing another embodiment of rectifier assembly.
Figs. 1 and 2 show a full-wave rectifier assembly for a three-phase generator for a motor vehicle. The rectifier asembly has a positive heat sink 11 serving as a first heat sink, and a negative heat sink 1 2 serving as a second heat sink. The two heat sinks 11, 12 are of substantially sectorial construction but are asymmetrical in that the heat sink 11 is larger than the heat sink 12. Conductors 13 (Fig. 2) are let into an insulating plate 13 which will be seen in Fig. 1 behind the heat sinks 11, 12. "Positive" diodes 14 are fitted in the first heat sink and are electrically connected thereto by their cathodes, and "negative" diodes 15 are fitted in the second heat sink 12 and are electrically connected thereto by their anodes.An opening 16 through which the generator shaft passes is provided in the centre of the overall rectifier assembly 11, 12, 1 3 at right angles to the surfaces of the heat sinks 11, 12. The negative heat sink 12 has screw connections 17 for securing the smaller heat sink 12 directly to the generator housing (not visible in the drawing) so that the generator housing acts as a supplemental heat sink for the negative diodes. The larger positive heat sink 11 carries connection pins 18 for the connection of positive leads and a further, insulated, screw bolt 19 for further securing the rectifier assembly to the generator housing. The heat sinks 11, 12 are made from sheet metal, and angled tabs 21 are stamped out of the heat sinks between the diodes 14, 15 and the opening 16. Further more, the outer rims of the heat sinks 11, 12 incorporate apertures 22.The tabs 21 and the apertures 22 are further described below. The negative heat sink 12 occupies a space which corresponds to approximately a third of a circular sector, whereas the positive heat sink 11 cover almost half a circular sector. The remaining sector 20 of one sixth of a circular sector is left free and serves to receive a further component such as a unit of the generator comprising a voltage regulator and a brush-holder.
Fig. 2 shows the rectifier unit viewed from the side of the insulating plate 13. The conductors 23 in the insulating plate 13 serve for the electrical connection of the free electrode terminals of the diodes 14, 15, i.e. the anodes of the diodes 14 and the cathodes of the diodes 15, respectively to the three phases of the stator winding of the generator.
Figs. 3 and 4 show the second heat sink, that is to say, the negative heat sink 12 and
Figs. 5 and 6 show the positive heat sink 11.
The reference numerals used hitherto apply analogously. Figs. 4 and 6 particularly show collars 1 4a, 15a about the openings for receiving the diodes 14 and 15, and the tabs 21 which are stamped out of the plate of the heat sink 11, 12. The tabs 21 are each associated with a respective one of the diodes 14, 15 and extend from the opening 16 to the respective diodes 1 4, 15, that is to say, they are bent out of the plate of the heat sink 11, 12 on the side thereof which carries the diodes 14, 15. Like the heat sink 11, the outer rim of the heat sink 12 is bent up in a collar-like manner. Collar-like bent-up portions 24, 25 serve for improved cooling. The transition 26 from the planar plate of the heat sink 11, 12 to the bent-up portions 24, 25 is circularly arcuate.The apertures 22 already mentioned are incorporated in the arcuate transistion 26 between the plate of the heat sink 11, 12 and the outer bent-up portion 25, that is to say, the bent-up portion which is remote from the opening 16.
The collar-like bent-up portions 25 of the first heat sink 25 and the apertures 22 incorporated in the arcuate transition 26 are shown particularly clearly in Fig. 7.
Fig. 8 illustrates a second embodiment of the rectifier assembly in which the apertures 22' are formed in the outer rims of the heat sinks 11' and 12' by incomplete stamping which forms the bent out tabs 21' in the vicinity of the diodes 14, 15. There are two tabs 21' for each diode and the tabs are directed to the gaps between adjacent diodes.
The embodiment of Fig. 8 is otherwise the same as the embodiment of Figs. 1 and 2, the rear view of the Fig. 8 embodiment being substantially identical to Fig. 2, and like parts are denoted by like reference numerals. Figs.
9 and 10 show the apertures 22' and the tabs 21' of the smaller heat sink 12' in more detail. The apertures 22' and the tabs 21' of the larger heat sink 11' are similar.
The tabs 21, 21' and the apertures 22, 22' promote the flow of the generator cooling air over the heat sinks and the diodes thereon.
It will be seen that each heat sink 11 or 11', 12 or 12' is provided with a minimal number of diodes, i.e. one for each place of the generator.
The mounting of the diodes 15 in the collars 15a cam be seen clearly in Fig. 10.
Claims (33)
1. A rectifier assembly for installation in a generator, which assembly has an opening through which the generator shaft passes and comprises a first heat sink with one set of diodes thereon and a second heat sink with another set of diodes thereon, the second heat sinks being in thermal contact with a supplementary heat sink, and having a smaller cool ing surface than the first heat sink.
2. A rectifier assembly as claimed in claim 1, in which the first and second heat sinks are disposed in a common plane at right angles to the generator shaft.
3. A rectifier assembly as claimed in claim 1 or 2, in which the first and second heat sinks are of substantially sectorial shape.
4. A rectifier assembly as claimed in claim 3, in which the first heat sink occupies approximately half a circular sector.
5. A rectifier assembly as claimed in claim 3 or 4, in which the second heat sink occupies approximately a third of a circular sector.
6. A rectifier assembly as claimed in any preceding claim, in which a sector is left free between the first and second heat sinks.
7. A rectifier assembly as claimed in claim 6, in which a further component in the form of a voltage regulator and brush-holder unit is fitted in the sector which has been left free.
8. A rectifier assembly as claimed in any preceding claim, in which the second heat sink is provided with screw connections of adequate size for the dissipation of the heat of the diodes to the supplementary heat sink.
9. A rectifier assembly as claimed in any preceding claim, in which the supplementary heat sink is the generator housing.
10. A rectifier assembly as claimed in any preceding claim, in which each heat sink is equipped with just one diode for each phase of the generator.
11. A rectifier assembly as claimed in claim 10, for a three-phase generator of high output, in which just three positive diodes and three negative diodes are provided respectively on the first and second heat sinks.
1 2. A rectifier assembly as claimed in any preceding claim, which further comprises an insulating plate having electrical conductors therewith or thereon, for the purpose of establishing the required electrical connection to the free electrode terminals of the diodes.
13. A rectifier assembly as claimed in any preceding claim, in which the first and second heat sinks are made from sheet metal.
14. A rectifier assembly as claimed in claim 13, in which at least one portion of the rims of the first and second heat sinks is provided with collar-like bent-up portions.
15. A rectifier assembly as claimed in claim 14, in which the inside of the transition from the portion of each of the heat sinks which is at right angles to the generator shaft to the collar-like bent-up portion which is remote from the opening for the generator shaft, is circularly arcuate.
16. A rectifier assembly as claimed in claim 15, in which apertures are formed in the arcuate transition.
17. A rectifier assembly as claimed in claim 16, in which the apertures are located in the centre of the arcuate transition.
18. A rectifier assembly as claimed in any preceding claim, in which angled tabs are stamped out of the first and second heat sinks.
19. A rectifier assembly as claimed in claim 18, in which a stamped out tab is provided for each of the diodes.
20. A rectifier assembly as claimed in claim 18 or 19, in which the stamped out tabs are disposed between the diodes and the opening provided for the generator shaft.
21. A rectifier assembly as claimed in claim 18, 19 or 20, in which the stamped out tabs are directed towards the associated diodes.
22. A rectifier assembly as claimed in any of claims 18 to 21, when dependent from any of claims 14 to 17, in which the angled tabs extend in the same direction as the collar-like bent-up portions.
23. A rectifier assembly as claimed in claim 18, when appendent to claim 16, in which the apertures are formed by the stamping out of the tabs.
24. A rectifier assembly for installation in a generator, having at least one heat sink for the rectifier diodes, which heat sink is made chiefly from sheet metal and is bent up at a rim, and having an opening through which the generator shaft passes, tabs being bent out of the rim of the heat sink.
25. A rectifier assembly as claimed in claim 24, in which the inside of the transition from the portion of the heat sink which is at right angles to the generator shaft to the rim which is remote from the opening for the generator shaft, is circularly arcuate.
26. A rectifier assembly as claimed in claim 25, in which apertures are provided in the arcuate transition.
27. A rectifier assembly as claimed in claim 26, in which the apertures are located in the centre of the arcuate transition.
28. A rectifier assembly as claimed in claim 26 or 27, in which the tabs are disposed at the boundary of the apertures.
29. A rectifier assembly as claimed in claim 28, in which the tabs are produced by incomplete stamping-out of the apertures.
30. A rectifier assembly as claimed in any of claims 23 to 29, in which at least one tab is provided for each of the diodes.
31. A rectifier assembly as claimed in any of claims 23 to 29, in which the tabs are disposed between the diodes.
32. A rectifier assembly as claimed in any of claims 23 to 31, in which the tabs extend towards the spaces between the associated diodes.
33. A rectifier assembly constructed substantially as herein described with reference to and as illustrated in the drawings.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2936204A DE2936204C2 (en) | 1979-09-07 | 1979-09-07 | Rectifier unit |
| DE19792942693 DE2942693A1 (en) | 1979-10-23 | 1979-10-23 | RECTIFICATION UNIT |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2057763A true GB2057763A (en) | 1981-04-01 |
| GB2057763B GB2057763B (en) | 1983-09-14 |
Family
ID=25780914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8028668A Expired GB2057763B (en) | 1979-09-07 | 1980-09-05 | Rectifier assembly |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2057763B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7091637B2 (en) | 2002-12-19 | 2006-08-15 | Denso Corporation | AC generator for vehicle having rectifying unit |
| CN1332498C (en) * | 2002-07-16 | 2007-08-15 | 罗伯特-博希股份公司 | Cooling body and rectifier module for an electrical machine |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| USD1036987S1 (en) | 2022-11-23 | 2024-07-30 | Zuru (Singapore) Pte. Ltd. | Blister cup for confectionery |
-
1980
- 1980-09-05 GB GB8028668A patent/GB2057763B/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1332498C (en) * | 2002-07-16 | 2007-08-15 | 罗伯特-博希股份公司 | Cooling body and rectifier module for an electrical machine |
| US7505273B2 (en) | 2002-07-16 | 2009-03-17 | Robert Bosch Gmbh | Cooling body and rectifier module for an electrical machine |
| US7091637B2 (en) | 2002-12-19 | 2006-08-15 | Denso Corporation | AC generator for vehicle having rectifying unit |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2057763B (en) | 1983-09-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 746 | Register noted 'licences of right' (sect. 46/1977) | ||
| PE20 | Patent expired after termination of 20 years |
Effective date: 20000904 |