US4171510A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for detecting output of controllable semiconductor device
Assignee: Hitachi Ltd
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Filing: 1977-10-20
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Granted: 1979-10-16
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Expires: 1997-10-20
Abstract
Abstract A system for detecting an output of a controllable semiconductor device includes a controllable semiconductor device, a magnetic amplifier to which an output of the semiconductor device is fedback to control the semiconductor device, and a monitor device for monitoring an output of the magnetic amplifier. The monitor device serves for determining that the output of said semiconductor device exceeds a predetermined level, when the output of the magnetic amplifier is in a remanent output region of the magnetic amplifier.
Inventors
- 👤 Hisakatsu Kiwaki
- 👤 Masahiko Ibamoto
- 👤 Masato Suzuki
- 👤 Jinichi Toyama
- 👤 Shigeru Kuriyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:20
CPC Classifications
H; H02; H02H; H02H7/00; H02H7/10; H02H7/12; H02H7/1213; H02H7/08; H02H7/0833; H02H7/122; H02M; H02M3/00; H02M3/02; H02M3/04; H02M3/10; H02M3/125; H02M3/135; H02M3/137
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
77 words
A system for detecting an output of a controllable semiconductor device comprising a controllable semiconductor device, a magnetic amplifier to which an output of said semiconductor device is fedback to control said semiconductor device, and a monitor means for monitoring an output of said magnetic amplifier and for determining that the output of said semiconductor device exceeds a predetermined level, when the output of said magnetic amplifier is in a remanent output region of said magnetic amplifier.
Claim 2
Independent Claim
77 words
A system for detecting an output of a controllable semiconductor device comprising a controllable semiconductor device, a magnetic amplifier to which an output of said semiconductor device is fedback to control said semiconductor device, and a monitor means for monitoring an output of said magnetic amplifier and for determining that the output of said semiconductor device exceeds a predetermined level, when the output of said magnetic amplifier is in a remanent output region of said magnetic amplifier.
Claim 3
Dependent Claim
40 words
A system according to claim 1, wherein said monitor means includes at least two level setting elements for setting two levels so that said monitor means is activated when the output of said magnetic amplifier is between the two levels.
Claim 4
Dependent Claim
43 words
A system according to claim 1 wherein said magnetic amplifier receives a command and the output of said semiconductor device and said magnetic amplifier produces a control signal in accordance with a deviation between the command and the output of said semiconductor device.
Claim 5
Dependent Claim
23 words
A system according to claim 3 wherein said command is applied in a sense to increase a normal output of said magnetic amplifier.
Claim 6
Dependent Claim
23 words
A system according to claim 3 wherein said command is applied in a sense to increase a remanent output of said magnetic amplifier.
Claim 7
Independent Claim
95 words
A system for detecting an output of a controllable semiconductor device comprising a power supply, a controllable semiconductor device connected to said power supply, a motor adapted to be controlled by said semiconductor device, a magnetic amplifier to which an output of said semiconductor device is fedback to control said semiconductor device, and a monitor means for monitoring an output of said magnetic amplifier and for determining that the output of said semiconductor device exceeds a predetermined level, when the output of said magnetic amplifier is in a remanent output region of said magnetic amplifier.
Claim 8
Independent Claim
95 words
A system for detecting an output of a controllable semiconductor device comprising a power supply, a controllable semiconductor device connected to said power supply, a motor adapted to be controlled by said semiconductor device, a magnetic amplifier to which an output of said semiconductor device is fedback to control said semiconductor device, and a monitor means for monitoring an output of said magnetic amplifier and for determining that the output of said semiconductor device exceeds a predetermined level, when the output of said magnetic amplifier is in a remanent output region of said magnetic amplifier.
Claim 9
Dependent Claim
40 words
A system according to claim 6, wherein said monitor means includes at least two level setting elements for setting two levels so that said monitor means is activated when the output of said magnetic amplifier is between the two levels.
Claim 10
Dependent Claim
22 words
A system according to claim 6 wherein said monitor means, when activated, operates to isolate said semiconductor device from said power supply.
Claim 11
Dependent Claim
20 words
A system according to claim 6 wherein said monitor means, when activated, operates to control a field of said motor.
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) | 1982-10-15 | 1983-04-16 | 1983-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-15 | 1987-04-16 | 1987-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-15 | 1991-04-16 | 1991-10-16 | $7700.00 | Window Closed / Lapsed |