Patent US4955053A successfully refreshed from Google Patents.
US4955053A
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US
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Solid state ringing switch
Assignee: Vertiv Energy Systems Inc
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Filing: 1990-03-16
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Granted: 1990-09-04
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Expires: 2010-03-16
Abstract
Abstract A ringing switch for providing ringing voltage and tripping voltage to the cable pairs of a telephone central office. The switch synchronizes the control signal from a cadence generator with the zero crossing of the ringing voltage to ensure that the voltage at the switch output changes from the ringing voltage to the tripping voltage or vice versa only when the ringing voltage crosses the tripping voltage. Field effect transistors are used to switch the ringing voltage and a silicon controlled rectifier is used to switch the tripping voltage.
Inventors
- 👤 Gary G. Siegmund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:50
CPC Classifications
H; H04; H04M; H04M19/00; H04M19/02
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
155 words
A switch for providing to a load a signal from an ac source for a predetermined time interval, said switch comprising: (a) means for determining when said ac signal crosses another signal in a predetermined direction and generating a signal indicative thereof; (b) means for synchronizing said indicative signal to a periodic control signal representative of said predetermined ac signal time interval and generating a first output signal when said indicative signal occurs in said predetermined ac signal time interval; (c) first power output switching means having a closed state which has a substantially constant and low impedance for providing said ac signal to said load; (d) supply means for generating from said ac signal without introducing any perceptible distortion therein a floating source of power; and (e) means responsive to said synchronizing means first output signal for using said floating source of power to drive said first power output means into said closed state.
Claim 2
Dependent Claim
155 words
A switch for providing to a load a signal from an ac source for a predetermined time interval, said switch comprising: (a) means for determining when said ac signal crosses another signal in a predetermined direction and generating a signal indicative thereof; (b) means for synchronizing said indicative signal to a periodic control signal representative of said predetermined ac signal time interval and generating a first output signal when said indicative signal occurs in said predetermined ac signal time interval; (c) first power output switching means having a closed state which has a substantially constant and low impedance for providing said ac signal to said load; (d) supply means for generating from said ac signal without introducing any perceptible distortion therein a floating source of power; and (e) means responsive to said synchronizing means first output signal for using said floating source of power to drive said first power output means into said closed state.
Claim 3
Dependent Claim
13 words
The switch of claim 1 wherein said ac source is a ringing generator.
Claim 4
Dependent Claim
43 words
The switch of claim 1 wherein said switch also provides to said load for a predetermined time interval a dc signal and said switch further comprises: second power output switching means having a closed state for providing said dc signal to said load.
Claim 5
Dependent Claim
21 words
The switch of claim 3 wherein said ac source is a ringing generator and said another signal is said dc signal.
Claim 6
Dependent Claim
19 words
The switch of claim 4 wherein said periodic control signal is also representative of said predetermined dc time interval.
Claim 7
Dependent Claim
42 words
The switch of claim 1 wherein said means responsive to said synchronizing means first output signal is also responsive to said first output signal for using said floating source of power to maintain said first power output means in said closed state.
Claim 8
Dependent Claim
27 words
The switch of claim 1 wherein said substantially constant and low impedance of said first power output switching means is placed in series with said ac source.
Claim 9
Dependent Claim
169 words
A switch for alternately providing to a load a signal from a ringing generator for a predetermined time interval and a tripping signal for a predetermined time interval, said switch comprising: (a) means for determining when said ringing signal crosses said tripping signal in a predetermined direction and generating a signal indicative thereof; (b) means for synchronizing said indicative signal to a periodic control signal representative of said predetermined ringing time interval and generating a first output signal when said indicative signal occurs in said predetermined ringing time interval; (c) first power output switching means having a closed state which has a substantially constant and low impedance for providing said ringing signal to said load; (d) second power output switching means having a closed state for providing said tripping signal to said load; and (e) means responsive to said synchronizing means first output signal for generating from said ringing signal without introducing any perceptible distortion therein a signal for driving said first power output means into said closed state.
Claim 10
Dependent Claim
169 words
A switch for alternately providing to a load a signal from a ringing generator for a predetermined time interval and a tripping signal for a predetermined time interval, said switch comprising: (a) means for determining when said ringing signal crosses said tripping signal in a predetermined direction and generating a signal indicative thereof; (b) means for synchronizing said indicative signal to a periodic control signal representative of said predetermined ringing time interval and generating a first output signal when said indicative signal occurs in said predetermined ringing time interval; (c) first power output switching means having a closed state which has a substantially constant and low impedance for providing said ringing signal to said load; (d) second power output switching means having a closed state for providing said tripping signal to said load; and (e) means responsive to said synchronizing means first output signal for generating from said ringing signal without introducing any perceptible distortion therein a signal for driving said first power output means into said closed state.
Claim 11
Dependent Claim
49 words
The switch of claim 8 wherein said means responsive to said synchronizing means first output signal is also responsive to said first output signal for generating from said ringing signal without introducing any perceptible distortion therein a signal for maintaining said first power output means in said closed state.
Claim 12
Dependent Claim
39 words
The switch of claim 9 wherein said periodic control signal is also representative of said predetermined tripping time interval and said synchronizing means terminates said first output signal when said indicative signal occurs in said predetermined tripping time interval.
Claim 13
Dependent Claim
63 words
The switch of claim 10 wherein said synchronizing means generates a second output signal when said indicative signal occurs in said predetermined tripping time interval and said means responsive to said synchronizing means first output signal is also responsive to said second output signal for generating from said tripping signal a signal for driving said second power output means into said closed state.
Claim 14
Dependent Claim
175 words
A switch for alternately providing to a load a signal from a ringing generator for a predetermined time interval and a tripping signal for a predetermined time interval, said switch comprising: (a) means for determining when said ringing signal crosses said tripping signal in a predetermined direction and generating a signal indicative thereof; (b) means for synchronizing said indicative signal to a periodic control signal representative of said preedetermined ringing time interval and generating a first output signal when said indicative signal occurs in said predetermined ringing time interval; (c) first power output switching means having a closed state which places a substantially constant and low impedance in series with said ringing generator for providing said ringing signal to said load; (d) second power output switching means having a closed state for providing said tripping signal to said load; and (e) means responsive to said synchronizing means first output signal for generating from said ringing signal without introducing any perceptible distortion therein a signal for driving said first power output means into said closed state.
Claim 15
Dependent Claim
175 words
A switch for alternately providing to a load a signal from a ringing generator for a predetermined time interval and a tripping signal for a predetermined time interval, said switch comprising: (a) means for determining when said ringing signal crosses said tripping signal in a predetermined direction and generating a signal indicative thereof; (b) means for synchronizing said indicative signal to a periodic control signal representative of said preedetermined ringing time interval and generating a first output signal when said indicative signal occurs in said predetermined ringing time interval; (c) first power output switching means having a closed state which places a substantially constant and low impedance in series with said ringing generator for providing said ringing signal to said load; (d) second power output switching means having a closed state for providing said tripping signal to said load; and (e) means responsive to said synchronizing means first output signal for generating from said ringing signal without introducing any perceptible distortion therein a signal for driving said first power output means into said closed state.
Claim 16
Dependent Claim
49 words
The switch of claim 12 wherein said means responsive to said synchronizing means first output signal is also responsive to said first output signal for generating from said ringing signal without introducing any perceptible distortion therein a signal for maintaining said first power output means in said closed state.
Claim 17
Dependent Claim
39 words
The switch of claim 13 wherein said periodic control signal is also representative of said predetermined tripping time interval and said synchronzing means terminates said first output signal when said indicative signal occurs in said predetermined tripping time interval.
Claim 18
Dependent Claim
63 words
The switch of claim 14 wherein said synchronizing means generates a second output signal when said indicative signal occurs in said predetermined tripping time interval and said means responsive to said synchronizing means first output signal is also responsive to said second output signal for generating from said tripping signal a signal for driving said second power output means into said closed state.
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) | 1993-09-03 | 1994-03-05 | 1994-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-03 | 1998-03-05 | 1998-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-03 | 2002-03-05 | 2002-09-04 | $7700.00 | Window Closed / Lapsed |