Patent US3596112A successfully refreshed from Google Patents.
US3596112A
Expired / Lapsed
US
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Noise-isolated trigger signal generator for motor control
Assignee: Allen Bradley Co LLC
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Filing: 1969-12-17
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Granted: 1971-07-27
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Expires: 1989-12-17
Abstract
Abstract A trigger signal is generated from a DC power supply responsive to a full wave rectified synchronizing signal in phase with the motor current and a varying DC control signal. The synchronizing signal is fed to a base of an NPN transistor to periodically discharge a storage capacitor. The control signal is fed to a base of another NPN transistor in a transistor switching circuit which is also connected to the storage capacitor, which in one embodiment operates between an oscillator capacitor and the power supply, and which in the other embodiment operates in a shunt path around the oscillator capacitor. A transformer couples the trigger signal from the oscillator.
Inventors
- 👤 Terrance D Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:11
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/72; H03K17/722; H03K17/723; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/292; H02P7/295
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
45 words
A trigger signal generator as set forth in claim 1 wherein: said controllable current valve in said synchronizing signal source is connected across said storage capacitor so as to provide a shunt discharge path around said storage capacitor when said controllable current valve is conductive.
Claim 2
Dependent Claim
68 words
A trigger signal generator as set forth in claim 2 wherein: said storage capacitor is connected through parallel conductive paths to said power supply, and one of said conductive paths contains a resistor and a diode between said resistor and said storage capacitor to be reverse biased when said charge on said storage capacitor reaches a predetermined level to block said one conductive path to said power supply.
Claim 3
Dependent Claim
96 words
A trigger signal generator as set forth in claim 1 wherein: said summing circuit contains a first controllable current valve having a control element connected to said storage capacitor, a second controllable current valve connected between said power supply and said oscillator capacitor and having a control element connected to said first control valve, and a command signal source connected to receive said control input signal and connected to said first controllable current valve to vary the potential level of said first controllable current valve relative to said storage capacitor proportionately to said control input signal.
Claim 4
Dependent Claim
116 words
A trigger signal generator as set forth in claim 4 wherein: said first controllable current valve is a transistor having as its control element a base and having its emitter-collector circuit connected across said power supply, and said command signal source includes a pair of complementary transistors connected in series across said power supply and parallel to said first controllable current valve with a base of one of said pair of complementary transistors connected to receive a fixed base current and the other of said complementary transistors having its base section connected to receive said control input signal, and a junction between said complementary transistors being connected to an emitter of said first controllable current valves.
Claim 5
Dependent Claim
121 words
A trigger signal generator as set forth in claim 1 wherein: said summing circuit includes a summing junction coupled to said storage capacitor and connected to receive said control input signal, a bias supply connected to said summing junction, a first controllable Current valve connected across said power supply and having a control element connected to said summing junction, and a second controllable current valve connected across said oscillator capacitor to provide a shunt path for discharging said oscillator capacitor and having a control element connected to said bias supply and to said first controllable current valve to be normally conductive when said first controllable current valve is nonconductive and to be nonconductive when said first controllable current valve is conductive.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |