US4551643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power switching circuitry
Assignee: RCA Corp
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Filing: 1983-10-24
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Granted: 1985-11-05
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Expires: 2003-10-24
Abstract
Abstract A four layer insulated gate controlled semiconductor device has a range of anode-cathode currents over which gate control potentials will extinguish such anode-cathode current. Coupling circuitry for limiting the rate of change of turn-off gate control potential to the gate of the device enhances the range of anode-cathode current over which control is maintained.
Inventors
- 👤 John P. Russell
- 👤 Alvin M. Goodman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:10
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/567
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
146 words
In combination: a four-layered insulated-gate-controlled semiconductor device having gate, cathode and anode terminals, having a conduction path between said cathode and anode terminals and said device being characterized in that the level of its anode-to-cathode current is responsive to and monotonically controlled by, the gate-to-cathode potential for anode-to-cathode currents extending up to a given level; said device being nevertheless susceptible to latch-up for anode-to-cathode current below said given level when the rate of change of a turn-off potential applied to the gate is greater than a given value; means for applying control potentials between said gate and cathode terminals; and means coupled to said gate terminal for extending the anode-to-cathode current range, in which said device does not latch-up including means for limiting the rate of change of said gate-cathode control potentials having a polarity tending to turn-off said device, and to extinguish anode-to-cathode current conduction.
Claim 2
Dependent Claim
146 words
In combination: a four-layered insulated-gate-controlled semiconductor device having gate, cathode and anode terminals, having a conduction path between said cathode and anode terminals and said device being characterized in that the level of its anode-to-cathode current is responsive to and monotonically controlled by, the gate-to-cathode potential for anode-to-cathode currents extending up to a given level; said device being nevertheless susceptible to latch-up for anode-to-cathode current below said given level when the rate of change of a turn-off potential applied to the gate is greater than a given value; means for applying control potentials between said gate and cathode terminals; and means coupled to said gate terminal for extending the anode-to-cathode current range, in which said device does not latch-up including means for limiting the rate of change of said gate-cathode control potentials having a polarity tending to turn-off said device, and to extinguish anode-to-cathode current conduction.
Claim 3
Dependent Claim
40 words
The combination set forth in claim 1 wherein the means coupled to the gate terminal for extending the range of controlled anode currents includes a low pass filter coupled between said gate terminal and said means for applying control potentials.
Claim 4
Dependent Claim
87 words
The combination set forth in claim 1 wherein the means coupled to the gate terminal for extending the range of controlled anode current includes: a first resistance coupled between said means for applying control potentials and said gate terminal; a second resistance and a capacitance serially coupled between said gate and cathode terminals; and a diode connected in parallel across said second resistance and poled in a direction to conduct between said gate terminal and said capacitor for a control potential transition tending to extinguish anode current.
Claim 5
Dependent Claim
20 words
The combination set forth in claim 3 wherein said first resistance is included in the means for applying control potentials.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-11-04 | 1989-05-06 | 1989-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-04 | 1993-05-06 | 1993-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-04 | 1997-05-06 | 1997-11-05 | $7700.00 | Window Closed / Lapsed |