US5124616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for driving a load and for producing a signal indicative of the condition of the load
Assignee: Aumovio Systems Inc
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Filing: 1990-11-05
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Granted: 1992-06-23
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Expires: 2010-11-05
Abstract
Abstract A drive circuit for driving a capacitive load (4) and for producing a signal (FIG. 2b, 3b, 4b, 5b) indicative of the condition of the load, the circuit comprising: a FET (26) applying current to the load; a resistance (30) sensing the level of the applied current; a differential amplifier (32) detecting when the sensed level exceeds a predetermined threshold; and a bipolar transistor producing a control signal (FIG. 2b, 3b, 4b, 5b) to limit the applied current until the load current falls below the threshold, whereby the control signal is a pulse width modulated signal whose pulse width is indicative of the condition of the load.
Inventors
- 👤 Stanley Wrzesinski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:32
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/46; G05F1/56; G05F1/565; G05F1/569; G05F1/573; B; B60; B60Q; B60Q11/00; H; H05; H05B; H05B39/00; H05B39/02; H05B39/04; H05B39/041; H05B39/044; H05B39/047; H05B47/00; H05B47/20; H05B47/25; Y; Y02; Y02B; Y02B20/00; Y10; Y10S; Y10S323/00; Y10S323/908
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
99 words
A circuit for driving a load and for producing a signal indicative of the condition of the load, the circuit comprising: means for applying current to the load; means for sensing the level of the applied current; means for detecting when the sensed level exceeds a predetermined threshold; and means for producing a reduction control signal to limit the applied current until the load current falls below the threshold, whereby the reduction control signal is a pulse width modulated signal whose pulse width is indicative of the condition of the load and indicates a plurality of abnormal load conditions.
Claim 2
Dependent Claim
99 words
A circuit for driving a load and for producing a signal indicative of the condition of the load, the circuit comprising: means for applying current to the load; means for sensing the level of the applied current; means for detecting when the sensed level exceeds a predetermined threshold; and means for producing a reduction control signal to limit the applied current until the load current falls below the threshold, whereby the reduction control signal is a pulse width modulated signal whose pulse width is indicative of the condition of the load and indicates a plurality of abnormal load conditions.
Claim 3
Dependent Claim
19 words
A circuit according to claim 1 wherein the means for applying current to the load comprises first transistor means.
Claim 4
Dependent Claim
16 words
A circuit according to claim 2 wherein the first transistor means comprises field effect transistor means.
Claim 5
Dependent Claim
20 words
A circuit according to claim 1 wherein the means for sensing the level of the applied current comprises a resistance.
Claim 6
Dependent Claim
35 words
A circuit according to claim 1 wherein the means for detecting when the sensed level exceeds a predetermined threshold comprises first differential amplifier coupled to the means for sensing the level of the applied current.
Claim 7
Dependent Claim
55 words
A circuit according to claim 1 wherein the means for producing a reduction control signal to limit the applied current until the load current falls below the threshold comprises second transistor means coupled between the means for applying current to the load and the means for detecting when the sensed level exceeds a predetermined threshold.
Claim 8
Dependent Claim
15 words
A circuit according to claim 6 wherein the second transistor means comprises bipolar transistor means.
Claim 9
Dependent Claim
15 words
A circuit according to claim 7 wherein the bipolar transistor means comprises a npn transistor.
Claim 10
Dependent Claim
21 words
A circuit according to claim 1 further comprising level translator means coupled to the means for applying current to the load.
Claim 11
Dependent Claim
17 words
A circuit according to claim 9 wherein the level translator means comprises a second differential amplifier means.
Claim 12
Dependent Claim
107 words
A drive circuit for driving a load and for producing a signal indicative of the condition of the load, the circuit comprising: first transistor means for applying current to the load; resistance means for sensing the level of the applied current; differential amplifier means for detecting when the sensed level exceeds a predetermined threshold; and second transistor means for producing a reduction control signal to limit the applied current until the load current falls below the threshold; whereby the reduction control signal is a pulse width modulated signal whose pulse width is indicative of the condition of the load and indicates a plurality of abnormal load conditions.
Claim 13
Dependent Claim
107 words
A drive circuit for driving a load and for producing a signal indicative of the condition of the load, the circuit comprising: first transistor means for applying current to the load; resistance means for sensing the level of the applied current; differential amplifier means for detecting when the sensed level exceeds a predetermined threshold; and second transistor means for producing a reduction control signal to limit the applied current until the load current falls below the threshold; whereby the reduction control signal is a pulse width modulated signal whose pulse width is indicative of the condition of the load and indicates a plurality of abnormal load conditions.
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) | 1995-06-23 | 1995-12-23 | 1996-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-23 | 1999-12-23 | 2000-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-23 | 2003-12-23 | 2004-06-23 | $7700.00 | Window Closed / Lapsed |