Patent US6052268A successfully refreshed from Google Patents.
US6052268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical apparatus
Assignee: QED INTELLECTUAL PROPERTY SERVICES Ltd
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Filing: 1997-07-03
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Granted: 2000-04-18
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Expires: 2017-07-03
Abstract
Abstract A semiconductor switch die (30) is mounted on one face of a substrate (31) and has a temperature sensor (10) on the opposite face to monitor the temperature in the vicinity of the semiconductor die. A current sensor (4) and voltage sensor (5) supply signals to a processor (15) to calculate power dissipated by the semiconductor device. The processor calculates the temperature of the device itself from the measured temperature and the dissipated power. If this exceeds a preset limit, the switching device is opened to prevent damage.
Inventors
- 👤 Kevin Paul Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:05
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/08; H03K17/082; H03K2017/0806
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
156 words
Electrical apparatus including a semiconductor switching device (30), an arrangement (4, 5, 9, 15) that derives a measure of power dissipated by said device, a sensor (10) that provides a measure of the temperature in the vicinity of the device, and means to restrict flow of current through the device (3) in response to a combination of the measure of power and the measure of temperature, characterised in that the apparatus includes a processor (15) that calculates the resultant heat gain and heat loss of the semiconductor device (30) over a period of time at a plurality of different nodes within the device (30), that the processor (15) calculates the temperature of the device at a plurality of different nodes in the device at the end of that time, and that the apparatus restricts flow of current through the device if the calculated temperature of the node with the highest calculated temperature exceeds a predetermined temperature.
Claim 2
Dependent Claim
156 words
Electrical apparatus including a semiconductor switching device (30), an arrangement (4, 5, 9, 15) that derives a measure of power dissipated by said device, a sensor (10) that provides a measure of the temperature in the vicinity of the device, and means to restrict flow of current through the device (3) in response to a combination of the measure of power and the measure of temperature, characterised in that the apparatus includes a processor (15) that calculates the resultant heat gain and heat loss of the semiconductor device (30) over a period of time at a plurality of different nodes within the device (30), that the processor (15) calculates the temperature of the device at a plurality of different nodes in the device at the end of that time, and that the apparatus restricts flow of current through the device if the calculated temperature of the node with the highest calculated temperature exceeds a predetermined temperature.
Claim 3
Dependent Claim
22 words
Electrical apparatus according to claim 1, characterised in that the apparatus restricts current flow through the device by opening the device (30).
Claim 4
Dependent Claim
43 words
Electrical apparatus according to claim 1 or 2, characterised in that the semiconductor switching device comprises a semiconductor die (30) mounted on one side of a substrate (31), and that the temperature sensor (10) is mounted on the opposite side of the substrate.
Claim 5
Independent Claim
159 words
A method of protecting a semiconductor circuit protection device (30) comprising the steps of measuring the temperature in the vicinity of the device, determining the power dissipated by the device (30), determining the temperature of the semiconductor device from the power dissipated by the device and the measured temperature in the vicinity of the device, comparing the determined temperature with a maximum permitted temperature, and restricting current flow through device if the maximum permitted temperature is exceeded, characterised in that the resultant heat gain and heat loss of the semiconductor device (30) is calculated over a period of time at a plurality of different nodes within the device (30), that the temperature of the device at a plurality of different nodes in the device is calculated at the end of that time, and that the flow of current through the device is restricted if the calculated temperature of the node with the highest calculated temperature exceeds a predetermined temperature.
Claim 6
Independent Claim
159 words
A method of protecting a semiconductor circuit protection device (30) comprising the steps of measuring the temperature in the vicinity of the device, determining the power dissipated by the device (30), determining the temperature of the semiconductor device from the power dissipated by the device and the measured temperature in the vicinity of the device, comparing the determined temperature with a maximum permitted temperature, and restricting current flow through device if the maximum permitted temperature is exceeded, characterised in that the resultant heat gain and heat loss of the semiconductor device (30) is calculated over a period of time at a plurality of different nodes within the device (30), that the temperature of the device at a plurality of different nodes in the device is calculated at the end of that time, and that the flow of current through the device is restricted if the calculated temperature of the node with the highest calculated temperature exceeds a predetermined temperature.
References Cited (Backward Citations)
US4727450A
Cited
US5854731A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-04-18 | 2003-10-18 | 2004-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-04-18 | 2007-10-18 | 2008-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-04-18 | 2011-10-18 | 2012-04-18 | $7700.00 | Window Closed / Lapsed |