Patent US3190855A successfully refreshed from Google Patents.
US3569739A
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US
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Variable level detector network having constant percentage hysteresis
Assignee: Bendix Corp
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Filing: 1967-12-18
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Granted: 1971-03-09
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Expires: 1987-12-18
Abstract
Abstract A level detector network including means for comparing an unknown signal to a variable reference signal and switching means connected to the comparing means for affecting said means so that the output therefrom is at one logic level when the unknown signal is greater than the reference signal and at another logic level when the unknown signal is less than the reference signal. The device has a constant percentage voltage hysteresis, and which hysteresis is independent of the reference signal.
Inventors
- 👤 Steven D Stolman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:53
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/20; H02H3/202; G; G01; G01R; G01R19/00; G01R19/04; G01R19/165; G01R19/16566; G01R19/16576
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
175 words
A level detection network comprising: A source of unknown signals corresponding to a condition; A first resistor connected to said unknown signal source; A source of reference signals; A second resistor connected to the reference signal source; An amplifier connected to the first and second resistors and responsive to the unknown and reference signals applied therethrough for becoming saturated in one sense when the unknown signal is less than the reference signal and for becoming saturated in another sense when the unknown signal is greater than the reference signal; A current flow control device; and A third resistor connecting the current flow control device in feedback relation to the amplifier for opening a path to ground when the amplifier is saturated in the one sense and for closing a path to ground when the amplifier is saturated in the other sense, with the percent hysteresis of the amplifier being constant and independent of the reference signal level and equal to the ratio of the second resistor to the sum of the second and third resistors.
Claim 2
Dependent Claim
175 words
A level detection network comprising: A source of unknown signals corresponding to a condition; A first resistor connected to said unknown signal source; A source of reference signals; A second resistor connected to the reference signal source; An amplifier connected to the first and second resistors and responsive to the unknown and reference signals applied therethrough for becoming saturated in one sense when the unknown signal is less than the reference signal and for becoming saturated in another sense when the unknown signal is greater than the reference signal; A current flow control device; and A third resistor connecting the current flow control device in feedback relation to the amplifier for opening a path to ground when the amplifier is saturated in the one sense and for closing a path to ground when the amplifier is saturated in the other sense, with the percent hysteresis of the amplifier being constant and independent of the reference signal level and equal to the ratio of the second resistor to the sum of the second and third resistors.
Claim 3
Dependent Claim
26 words
A level detector as described by claim 1, wherein: the first resistor is equal to the parallel combination of the second resistor and the third resistor.
Claim 4
Dependent Claim
18 words
A level detector as described by claim 1, wherein: the first resistor is equal to the second resistor.
Claim 5
Dependent Claim
53 words
A level detector as described by claim 1, wherein: the current flow control device is a transistor having base, emitter and collector elements; the base element is connected to an output of the amplifier; the emitter element is connected to an input of the amplifier; and the collector element is connected to ground.
Claim 6
Dependent Claim
63 words
A level detector as described by claim 1, wherein: the amplifier has an inverting input and a noninverting input; the unknown signal source is connected through the first resistor to the inverting input; the reference signal source is connected through the second resistor to the noninverting input; and the current flow control device is connected through the third resistor to the noninverting input.
References Cited (Backward Citations)
US2773981A
Cited
US3416004A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |