Patent US4942510A successfully refreshed from Google Patents.
US4942510A
Expired / Lapsed
US
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Power and signal transfer interface circuit
Assignee: Aumovio Systems Inc
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Filing: 1989-12-04
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Granted: 1990-07-17
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Expires: 2009-12-04
Abstract
Abstract An interface circuit serves to rectify excitation energy inductively coupled to a transistor acting in a diode configuration to charge a reservoir capacitor which may then serve as a power source. Switch means under the control of an external functional circuit block is arranged to bias the transistor into a reverse operating mode to itself act as a switch to discharge energy from the reservoir into the coupling. In this way pulses may be back coupled to be detected at the excitation source. The timing of the back coupled pulses may be information bearing.
Inventors
- 👤 Arthur J. Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:09
CPC Classifications
B; B60; B60C; B60C23/00; B60C23/02; B60C23/04; B60C23/0408; B60C23/20; H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/21; H02M7/217
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
112 words
An interface circuit for providing a power source to a functional circuit block from a coupled alternating excitation source and a return transmission path from said block to said source comprising: a transistor, associated switch means, and energy storage means, said transistor having a forward mode of operation, wherein it serves to rectify forwardly coupled excitation energy to thereby charge said energy storage means as said power source, and a reverse mode of operation wherein energy stored in said storage means is discharged to provide a back coupled pulse, said switch means being adapted to cooperate with said functional circuit block to controllably activate said reverse mode to provide said return transmission.
Claim 2
Dependent Claim
112 words
An interface circuit for providing a power source to a functional circuit block from a coupled alternating excitation source and a return transmission path from said block to said source comprising: a transistor, associated switch means, and energy storage means, said transistor having a forward mode of operation, wherein it serves to rectify forwardly coupled excitation energy to thereby charge said energy storage means as said power source, and a reverse mode of operation wherein energy stored in said storage means is discharged to provide a back coupled pulse, said switch means being adapted to cooperate with said functional circuit block to controllably activate said reverse mode to provide said return transmission.
Claim 3
Dependent Claim
16 words
An interfaced circuit as claimed in claim 1 and wherein said excitation source is inductively coupled.
Claim 4
Dependent Claim
32 words
An interface circuit as claimed in claim 2 and wherein said transistor acts as a switch in said reverse mode to discharge energy from said energy storage means into said inductive coupling.
Claim 5
Dependent Claim
21 words
An interface circuit as claimed in claim 1 and wherein said switch means is a further transistor acting as a switch.
Claim 6
Dependent Claim
17 words
An interface circuit as claimed in claim 1 and wherein said transistor is a lateral PNP type.
Claim 7
Dependent Claim
29 words
An interface circuit as claimed in claim 1 and including a zener diode referenced to supply ground and arranged to clamp the negative going portion of back couled pulses.
Claim 8
Dependent Claim
25 words
An interface circuit as claimed in claim 1 and including an active switch arranged to configure said transistor as a diode in said forward mode.
Claim 9
Dependent Claim
22 words
An interface circuit as claimed in claim 1, and wherein said transistor is arranged to have substantially equal forward and reverse gain.
Claim 10
Dependent Claim
12 words
An interface circuit as claimed in claim 1 in integrated circuit form.
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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) | 1993-07-16 | 1994-01-15 | 1994-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-16 | 1998-01-15 | 1998-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-16 | 2002-01-15 | 2002-07-17 | $7700.00 | Window Closed / Lapsed |