US3965971A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling system for semiconductors
Assignee: Eaton Corp
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Filing: 1974-06-27
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Granted: 1976-06-29
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Expires: 1994-06-27
Abstract
Abstract An SCR which controls the speed of a battery powered vehicle is liquid cooled by a closed circuit cooling system utilizing an oscillating pump, a heat exchanging reservoir, and an SCR mounting block. The SCR mounting block forms a fluid chamber when the SCR is mounted thereto. The heat exchanging reservoir is mounted to the vehicle chassis above the oscillating pump and is connected by tubing to both the pump and to the fluid chamber of the SCR mounting block to allow the pump to recirculate the liquid through the closed cooling system. The oscillating pump is connected to the battery of the vehicle through a chopper circuit to provide pulsating liquid flow from the pump in response to the pulsating D.C. signal from the chopper circuit. The pump thus circulates the heated liquid from the fluid chamber of the semiconductor mounting block to the heat exchanging reservoir where it is cooled and circulated back to the fluid chamber.
Inventors
- 👤 George H. Roggenkamp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:48
CPC Classifications
H; H10; H10W; H10W40/00; H10W40/40; H10W40/47
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
172 words
In a battery powered vehicle: a heat sink mounted on said vehicle; a power semiconductor utilized to vary the speed of the vehicle mounted on said heat sink, said heat sink having a cavity formed therein to mount said power semiconductor, and forming a fluid chamber for maintaining cooling fluid in heat transfer communication with said semiconductor; heat exchanger means mounted on said vehicle for dissipating heat to the ambient; an oscillating pump mounted on said vehicle at a level below said heat exchanger means; tubing means for connecting the fluid chamber of said heat sink, said heat exchanger means, and said oscillating pump into a closed series path to thereby allow said oscillating pump to recirculate cooling fluid therethrough; and a chopper circuit electrically connected to the battery of said vehicle and mounted proximate to said oscillating pump to convert the constant D.C. signal of the vehicle battery to a pulsating D.C. signal, said oscillating pump being electrically connected to said chopper to be driven by the pulsating D.C. signal therefrom.
Claim 2
Dependent Claim
172 words
In a battery powered vehicle: a heat sink mounted on said vehicle; a power semiconductor utilized to vary the speed of the vehicle mounted on said heat sink, said heat sink having a cavity formed therein to mount said power semiconductor, and forming a fluid chamber for maintaining cooling fluid in heat transfer communication with said semiconductor; heat exchanger means mounted on said vehicle for dissipating heat to the ambient; an oscillating pump mounted on said vehicle at a level below said heat exchanger means; tubing means for connecting the fluid chamber of said heat sink, said heat exchanger means, and said oscillating pump into a closed series path to thereby allow said oscillating pump to recirculate cooling fluid therethrough; and a chopper circuit electrically connected to the battery of said vehicle and mounted proximate to said oscillating pump to convert the constant D.C. signal of the vehicle battery to a pulsating D.C. signal, said oscillating pump being electrically connected to said chopper to be driven by the pulsating D.C. signal therefrom.
Claim 3
Dependent Claim
25 words
Apparatus as claimed in claim 1 including switch means for actuating said pump in response to a predetermined temperature being attained by said heat sink.
Claim 4
Dependent Claim
38 words
Apparatus as claimed in claim 2 wherein said switch means includes a bimetal switch mounted to sense said heat sink temperature and connecting said pump to the battery of the vehicle upon detecting a predetermined heat sink temperature.
Claim 5
Dependent Claim
22 words
Apparatus as claimed in claim 1 wherein said heat exchanger means includes a reservoir mounted to the main chassis of the vehicle.
Claim 6
Dependent Claim
54 words
Apparatus as claimed in claim 4 wherein said heat exchanger means includes a pair of reservoirs with one of said reservoirs mounted to the main chassis of the vehicle below the level of said oscillating pump, said one of said pair of reservoirs further having filling means for adding cooling fluid to the system.
Claim 7
Dependent Claim
21 words
Apparatus as claimed in claim 4 wherein said power semiconductor includes the main motor controlling SCR of the vehicle drive control.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-29 | 1979-12-29 | 1980-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-29 | 1983-12-29 | 1984-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-29 | 1987-12-29 | 1988-06-29 | $7700.00 | Window Closed / Lapsed |