Patent US4595972A successfully refreshed from Google Patents.
US4595972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
On/off power detector
Assignee: Motorola Solutions Inc
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Filing: 1984-12-18
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Granted: 1986-06-17
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Expires: 2004-12-18
Abstract
Abstract This on/off power detector includes an input connected directly to a power source and input connected to the power source through a switch. The detector compares voltages on the two inputs to produce an output signal when the voltage on the switched input drops a predetermined amount below the voltage on the unswitched input, which is indicative of the switch being open. The detector is strobed on and off and only compares the input voltages to provide the output signal when it is in its strobed on condition.
Inventors
- 👤 Walter L. Davis
- 👤 Michael J. DeLuca
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:19
CPC Classifications
H; H02; H02M; H02M1/00; G; G01; G01R; G01R19/00; G01R19/145; G01R19/155; H02M1/10
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
105 words
An on/off power detector for a circuit having a voltage source and a switch connected to the voltage source providing a switched output, comprising: a first input means operatively connected directly to the voltage source, a second input means operatively connected to the switched output and, comparator means responsive to voltages on the first and second input means for providing an output signal when the difference between the voltages on the first and second input means exceeds a predetermined amount, the comparator means including a control input means and is responsive to an enable signal on said control input means for providing said output signal.
Claim 2
Dependent Claim
105 words
An on/off power detector for a circuit having a voltage source and a switch connected to the voltage source providing a switched output, comprising: a first input means operatively connected directly to the voltage source, a second input means operatively connected to the switched output and, comparator means responsive to voltages on the first and second input means for providing an output signal when the difference between the voltages on the first and second input means exceeds a predetermined amount, the comparator means including a control input means and is responsive to an enable signal on said control input means for providing said output signal.
Claim 3
Dependent Claim
25 words
An on/off power detector as defined in claim 1 in which: a strobe means is connected to the control input for providing said enable signal.
Claim 4
Dependent Claim
33 words
An on/off power detector as defined in claim 2 in which: the comparator means includes latching means for latching said comparator on and maintaining said output signal upon cessation of said enable signal.
Claim 5
Dependent Claim
54 words
An on/off power detector as defined in claim 3, in which: the comparator means is actuated on and draws current when said enable signal is present and when it is latched on and is off and does not draw current when said enable signal is not present and when it is not latched on.
Claim 6
Dependent Claim
42 words
An on/off power detector as defined in claim 1, in which: a timer means is connected to the comparator means and has an output means, the timer means providing an output signal in time delay response to the comparator means output signal.
Claim 7
Dependent Claim
81 words
An on/off power detector as defined in claim 5, in which: the timer means includes; a current source means, a capacitor means connected to the current source means, a first switching means shunting the capacitor means and responsive the comparator means output signal for selectively shunting current from the capacitor means in the absence of said output signal from the comparator means, and a second switching means responsive to voltage on the capacitor means for providing said timing means output signal.
Claim 8
Dependent Claim
34 words
An on/off power detector as defined in claim 6, in which: the first switch means is operatively biased on to shunt current from the capacitor means when said switched output exceeds a predetermined amount.
Claim 9
Dependent Claim
29 words
An on/off power detector as defined in claim 7, in which: the first switch means comprises a switching transistor which derives its base bias from the switched output voltage.
Claim 10
Dependent Claim
132 words
A low power, low voltage device comprising: a low voltage power source, a switching means connected to the power source, a DC-DC converter, connected to the switching means, a load powered by the DC-DC converter having a reset input, and an on/off detector means having a first input connected to the power source, a second input connected to the output of the switching means and an output connected to the load reset input, the detector being responsive to the difference between voltages on the first and second inputs for providing a reset signal to reset signal to reset the load when the switching means is opened, the on/off detector means including a control input means and is responsive to an enable signal on said control input means for providing said reset signal.
Claim 11
Dependent Claim
132 words
A low power, low voltage device comprising: a low voltage power source, a switching means connected to the power source, a DC-DC converter, connected to the switching means, a load powered by the DC-DC converter having a reset input, and an on/off detector means having a first input connected to the power source, a second input connected to the output of the switching means and an output connected to the load reset input, the detector being responsive to the difference between voltages on the first and second inputs for providing a reset signal to reset signal to reset the load when the switching means is opened, the on/off detector means including a control input means and is responsive to an enable signal on said control input means for providing said reset signal.
Claim 12
Dependent Claim
30 words
A low power voltage device as defined in claim 9 including a crow bar circuit connected to the dc-dc converter, the crow bar circuit being responsive to said reset signal.
Claim 13
Dependent Claim
129 words
A low-power low voltage device comprising a low voltage power source, a switching means connected to the power source, a DC-DC converter, connected to the switching means, a load powered by the DC-DC converter having a reset input, and an on/off detector means having a first input connected to the power source, a second input connected to the output of the switching means and an output connected to the load reset input, the detector being responsive to the difference between voltages on the first and second inputs for providing a reset signal to reset the load when the switching means is opened, the load constituting a decoder for a paging receiver and the decoder is connected to the on-off detector for supplying an enable signal to actuate the detector.
Claim 14
Dependent Claim
129 words
A low-power low voltage device comprising a low voltage power source, a switching means connected to the power source, a DC-DC converter, connected to the switching means, a load powered by the DC-DC converter having a reset input, and an on/off detector means having a first input connected to the power source, a second input connected to the output of the switching means and an output connected to the load reset input, the detector being responsive to the difference between voltages on the first and second inputs for providing a reset signal to reset the load when the switching means is opened, the load constituting a decoder for a paging receiver and the decoder is connected to the on-off detector for supplying an enable signal to actuate the detector.
Claim 15
Dependent Claim
91 words
A portable paging receiver comprising, a power source means having a switched output and an unswitched output, a dc-dc converter powered from the switched output, decoder means powered by the dc-dc converter, the decoder means including means producing a strobe signal, and having a reset input, on-off power detector means coupled to and responsive to the switched and unswitched outputs for selectively providing a reset signal to said reset input, the detector means being responsive to said strobe signal to provide the reset signal when the dc-dc converter is switched off.
Claim 16
Dependent Claim
91 words
A portable paging receiver comprising, a power source means having a switched output and an unswitched output, a dc-dc converter powered from the switched output, decoder means powered by the dc-dc converter, the decoder means including means producing a strobe signal, and having a reset input, on-off power detector means coupled to and responsive to the switched and unswitched outputs for selectively providing a reset signal to said reset input, the detector means being responsive to said strobe signal to provide the reset signal when the dc-dc converter is switched off.
Claim 17
Dependent Claim
28 words
A portable paging receiver as defined in claim 12, in which: a crow bar means is connected to the dc-dc converter and is responsive to said reset signal.
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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) | 1989-06-16 | 1989-12-16 | 1990-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-16 | 1993-12-16 | 1994-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-16 | 1997-12-16 | 1998-06-17 | $7700.00 | Window Closed / Lapsed |