US4068135A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Signal isolating and sampling circuit
Assignee: Honeywell Inc
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Filing: 1976-11-16
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Granted: 1978-01-10
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Expires: 1996-11-16
Abstract
Abstract A signal isolating and sampling circuit using a transformer to isolate a signal input circuit from a signal output circuit. Signal sampling switches are used in the input and output circuits to sample an input signal applied to the input circuit. A photocoupler is provided for coupling a switch selecting signal to the sampling switch in the input circuit while an energizing signal for driving the sampling switch in the input circuit is supplied through the transformer from an energizing signal source connected to the signal output circuit. The energizing signal is rectified in the signal input circuit and used to drive the signal input circuit sampling switch under control of the switch selecting signal.
Inventors
- 👤 Tadashi Sonobe
- 👤 Seiji Onoki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:51
CPC Classifications
G; G11; G11C; G11C27/00; G11C27/02; H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/687; H03K17/6871; H03K17/6874
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
256 words
A signal isolating and sampling circuit comprising an input terminal an output terminal, a transformer means having primary and secondary sides, an input circuit sampling switch means connected between said primary of said transformer means and said input terminal, an output circuit sampling switch means connected between said secondary of said transformer means and said output terminal, a supply source switch means, a pulse supply means for supplying a switch energizing pulse to the secondary side of said transformer means through said supply source switch, a rectifying circuit means connected to the primary side of said transformer means for rectifying and storing said energizing pulse induced on said primary side of said transformer means, a photocoupler circuit means having an input and having an output connecting said input circuit sampling switch means to said rectifying circuit means and control means for connecting said input of said photocoupler means to a source of a switch selecting control signal for periodically driving said photocoupler circuit means to apply the stored energizing pulse to said input circuit sampling switch means whereby said input circuit sampling switch means is driven by the stored energizing pulse from said rectifying circuit means to connect said input terminal to said primary side of said transformer means and to apply a switch control signal to said supply source switch means to operate said supply source switch means to connect said pulse supply means to said secondary side of said transformer means between the driving of said photocoupler circuit by said switch selecting control signal,
Claim 2
Dependent Claim
256 words
A signal isolating and sampling circuit comprising an input terminal an output terminal, a transformer means having primary and secondary sides, an input circuit sampling switch means connected between said primary of said transformer means and said input terminal, an output circuit sampling switch means connected between said secondary of said transformer means and said output terminal, a supply source switch means, a pulse supply means for supplying a switch energizing pulse to the secondary side of said transformer means through said supply source switch, a rectifying circuit means connected to the primary side of said transformer means for rectifying and storing said energizing pulse induced on said primary side of said transformer means, a photocoupler circuit means having an input and having an output connecting said input circuit sampling switch means to said rectifying circuit means and control means for connecting said input of said photocoupler means to a source of a switch selecting control signal for periodically driving said photocoupler circuit means to apply the stored energizing pulse to said input circuit sampling switch means whereby said input circuit sampling switch means is driven by the stored energizing pulse from said rectifying circuit means to connect said input terminal to said primary side of said transformer means and to apply a switch control signal to said supply source switch means to operate said supply source switch means to connect said pulse supply means to said secondary side of said transformer means between the driving of said photocoupler circuit by said switch selecting control signal,
Claim 3
Dependent Claim
50 words
A signal isolating and sampling circuit as set forth in claim 1 wherein output circuit sampling switch means includes means for connection to a source of a switch energizing signal to operate said output circuit sampling means to connect said output terminal to said secondary side of said transformer means.
Claim 4
Dependent Claim
25 words
A signal isolating and sampling switch circuit as set forth in claim 2 wherein said input and output circuit sampling switch means are operated concurrently.
Claim 5
Dependent Claim
64 words
A signal isolating and sampling circuit as set forth in claim 1 wherein said rectifying means includes a pulse rectifying diode means and a storage capacitor means connected in series with said diode means for storing the rectified energizing pulse and circuit means for connecting said series combination of said diode means and said capacitor means across said primary side of said transformer means.
Claim 6
Dependent Claim
89 words
A signal isolating and sampling circuit as set forth in claim 4 wherein said photocoupler circuit means include a photo-emitting means connected to said control means to be energized thereby, a photo-receiving means having one end thereof connected to one side of said storage capacitor means, a resistance means connecting the other end of said photo-receiving means to the other end of said capacitor means and circuit means for applying a signal developed across said resistance means as a switch energizing signal to said input circuit sampling switch means.
References Cited (Backward Citations)
US3467836A
Cited
US3818235A
Cited
US3789244A
Cited
US3867580A
Cited
US3917963A
Cited
US3940634A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-09 | 1981-07-11 | 1982-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-09 | 1985-07-11 | 1986-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-09 | 1989-07-11 | 1990-01-10 | $7700.00 | Window Closed / Lapsed |