Ringer power generator circuit for subscriber carrier station terminal
阅读：336发布：2021-09-01
专利汇可以提供Ringer power generator circuit for subscriber carrier station terminal专利检索，专利查询，专利分析的服务。并且In a subscriber carrier station terminal including a two-wire drop that is associated with a VF hybrid circuit and a handset thereof, a DC ringer voltage is generated by a DC-DC converter that is powered only during a ringing cycle. Power to drive the ringer in the handset is coupled to the two-wire drop through a pair of back-to-back (decoupling) diodes that are connected to the neutral terminal of the converter and relay contacts that are switched at the central office ringing frequency between +80 volt and -80 volt DC output lines of the converter. The VF hybrid is decoupled from the two-wire drop by a third diode during ringing. The converter is decoupled from the drop circuit by the back-toback diodes when voice signals are on the drop lines. Positive ring trip is provided during a ringing cycle by sensing the current transient produced in the drop when the associated subscriber carrier handset goes off hook in order to turn off the converter for a prescribed time interval to enable establishment of loop current and completion of ring trip.，下面是Ringer power generator circuit for subscriber carrier station terminal专利的具体信息内容。
1. A ringer power generator circuit for use in a subscriber carrier telephone system comprising a carrier subscriber station terminal that includes a carrier subscriber handset, the system producing pulses of station terminal ringing signal at the carrier subscriber station terminal in response to a central office ringing signal wherein a cycle of the station terminal ringing signal comprises a ringing period including a series of pulses of ringing voltage followed by a silent period during which a constant voltage is present and these ringing pulses are absent and including a two-wire drop associated with the carrier subscriber handset and a VF hybrid circuit of the carrier subscriber station terminal; one drop wire being connected between one of the tip and ring leads of the handset and a first drop side lead on the hybrid circuit; said ringer pOwer generator circuit requiring only a two-wire drop for connection to a handset and comprising: first means for producing both positive and negative DC ringer voltages on associated output lines thereof, the magnitudes of said ringer voltages being greater than that of the pulses of ringing voltage; second means which is a control means responsive to the ringing pulses for causing said first means to produce said ringer voltages throughout a ringing period of a ringing cycle; third means for coupling one of the positive and negative output lines of said first means through the other drop wire to the second drop side lead on the hybrid during the absence of a station terminal ringing signal, said third means decoupling the hybrid from the one output line of said first means during generation of a ringer voltage thereby; fourth means responsive to operation of said second means for alternately electrically connecting the positive and negative ringer voltage output lines of said first means to the other one of the tip and ring leads of the handset during and between ringing pulses of a ringing period received from the central office for energizing a ringer of the handset; said fourth means continuously electrically connecting the other one of the tip and ring leads of the handset to the one output line of said first means except during a ringing period; and, fifth means which is a ring trip means responsive to a transient signal on the drop wires for sensing an off-hook condition in the handset for initiating ring trip and for de-energizing said first means.
2. The ringer circuit according to claim 1 wherein the subscriber carrier telephone system includes a power source producing first and second voltages, said ringer circuit comprising sixth means connecting third and fourth drop side leads of the hybrid circuit to the first and second voltages, respectively, for providing a loop current path through the hybrid circuit when the handset is off hook.
3. The ringer circuit according to claim 2 wherein said second means comprises: a first capacitor; a first resistor; a first transistor having a base electrode electrically connected through said first resistor and first capacitor to said first voltage; and having emitter and collector electrodes electrically connected between said first voltage and an input line to said first means; a second transistor being operable in two different operating states, having a base electrode to which the ringing pulses are applied, and having emitter and collector electrodes electrically connected in series between the second voltage and the junction of said first resistor and first capacitor; said second transistor operating in the first state during the absence of a ringing pulse and operating in the second state during receipt of a ringing pulse for charging said first capacitor and for causing said first transistor to conduct to energize said first means; said first capacitor discharging through said first resistor during operation of said second transistor in the first state for maintaining said first transistor conducting and said first means energized between receipt of ringing pulses during a ringing period.
4. The ringer circuit according to claim 3 wherein said fifth means comprises: a second capacitor and second resistor electrically connected in series between said first and second voltages; a third transistor having emitter and collector electrodes electrically connected across said second capacitor and having a base electrode; seventh means sensing an off-hook transient current in the drop wires for forward biasing said third transistor base electrode to cause said third transistor to conduct to discharge said second capacitor and pass a current through said second resistor; and, eighth means responsive to the voltage on said second resistor during conduction of said third transistor for biasing said second transistor to operate in the first state evEn during receipt of a ringing pulse for enabling initiation of ring trip.
5. The ringer circuit according to claim 4 wherein said first means comprises a third neutral reference voltage output line and wherein said ringer circuit includes a third resistor and first and second back-to-back diodes electrically connected between said neutral line and a point for connection to the one drop wires; and wherein said seventh means comprises a third diode electrically connected between the one side of said third resistor that is spaced from the point of connection to the one drop wire and said third transistor base electrode, said third diode conducting in response to a transient current through said third resistor when the handset goes off hook for biasing said third transistor to conduct.
6. The ringer circuit according to claim 5 wherein said fifth means comprises a third capacitor electrically connected between the one side of said third resistor and the first voltage.
7. The ringer circuit according to claim 6 wherein said third means comprises a fourth diode.
8. The ringer circuit according to claim 7 wherein said fifth means comprises a fifth diode electrically connected between the one side of said third resistor and the junction of said third diode and third capacitor; and wherein said eighth means comprises a fourth transistor responsive to the voltage on said second resistor during conduction of said third transistor and during charging of said second capacitor for effectively connecting the base electrode of said second transistor to the second voltage.
9. The ringer circuit according to claim 8 wherein said first, second, and third diodes are breakdown diodes.
10. The ringer circuit according to claim 7 wherein said second means comprises a fourth resistor electrically connected between said first transistor base electrode and the first voltage.
11. The ringer circuit according to claim 10 wherein said first means comprises a DC-DC converter.
12. The ringer circuit according to claim 7 wherein said fifth means comprises a fifth resistor between the electrical connections of the fourth drop side lead of the hybrid circuit and the second voltage, and a fifth transistor having collector and emitter electrodes electrically connected between the third transistor base electrode and the second voltage, and having a base electrode electrically connected to said fifth resistor for sensing the voltage developed thereacross, said fifth transistor operating in a first one of two states when the handset is on hook and operating in the second state for producing a ring trip signal when loop current flows through said fifth resistor.
13. In a subscriber carrier telephone system, comprising a carrier subscriber station terminal that includes a carrier subscriber handset; producing in the carrier subscriber station terminal DC pulses of station terminal ringing signal in response to a central office ringing signal wherein the station terminal ringing signal alternately comprises a ringing period including a series of pulses of ringing voltage following by a silent period during which a constant voltage is present and these ringing pulses are absent; and including a two-wire drop associated with the carrier subscriber handset and the VF hybrid circuit of the carrier subscriber station terminal, one drop wire being connected between one of the tip and ring leads on the handset and a first drop side lead on the hybrid circuit; the improvement comprising a ringer power generator circuit through which the other wire of the drop is electrically connected between the other one of the tip and ring leads on the handset and a second drop side lead on the hybrid, said ringer circuit comprising: first means for producing both positive and negative DC ringer voltages on associated output lines thereof, the magnitudes of said ringer voltages being greater than that of the pulses of ringing voltage; second means which is a control means responsive to the ringing pulses for causing said first means to produce said ringer voltages throughout a ringing period; third means that is electrically connected between one of the output lines of said first means and the second drop side lead on the hybrid, said third means decoupling the hybrid from the one output line of said first means during generation of a ringer voltage thereby; fourth means responsive to operation of said second means for alternately electrically connecting the positive and negative ringer voltage output lines of said first means to the other one of the tip and ring leads of the handset during and between ringing pulses of a ringing period that are received from the central office for energizing a ringer of the handset; said fourth means electrically connecting the other one of the tip and ring leads of the handset continuously to the one output line of said first means except during a ringing period; and, fifth means which is a ring trip means responsive to a transient signal on the drop wires for sensing an off-hook condition in the handset for initiating ring trip and for de-energizing said first means.
14. The ringer circuit according to claim 13 wherein said third means comprises a first diode.
15. The ringer circuit according to claim 14 wherein the telephone system includes a power source producing first and second DC voltages and third and fourth drop side leads of the hybrid circuit that are electrically connected to the first and second voltages, respectively, for providing a loop current path through the hybrid circuit when the handset is off hook; and including sixth means electrically connecting said first means to the power source.
16. The ringer circuit according to claim 15 wherein said second means comprises: a first capacitor; a first resistor; a first transistor having a base electrode electrically connected through said first resistor and first capacitor to said first voltage; and having emitter and collector electrodes electrically connected between said first voltage and an input line to said first means; a second transistor being operable in two different operating states, having a base electrode to which the ringing pulses are applied, and having emitter and collector electrodes electrically connected in series between the second voltage and the junction of said first resistor and first capacitor; said second transistor operating in the first state during the absence of a ringing pulse and operating in the second state during receipt of a ringing pulse for charging said first capacitor and for causing said first transistor to conduct to energize said first means; said first capacitor discharging through said first resistor during operation of said second transistor in the first state for maintaining said first transistor conducting and said first means energized between receipt of ringing pulses during a ringing period.
17. The ringer circuit according to claim 16 wherein said second means comprises a second resistor electrically connected between said first transistor base electrode and the first voltage.
18. The ringer circuit according to claim 17 wherein said fifth means comprises: a second capacitor and third resistor electrically connected in series between the first and second voltages; a third transistor having emitter and collector electrodes electrically connected across said second capacitor and having a base electrode; seventh means sensing an off-hook transient current in the drop wires for forward biasing said third transistor base electrode to cause said third transistor to conduct to discharge said second capacitor and pass a current through said third resistor; and, eighth means responsive to the voltage on said third resistor during conduction of said third transistor for biasing said second transistor to operate in the first state even during receipt of a ringing pulse for enabling ring trip operation.
19. The ringer circUit according to claim 18 wherein said first means comprises a third neutral reference voltage output line, and a fourth resistor and second and third back-to-back diodes connected between the one drop wire and said neutral line; and wherein said seventh means comprises a fourth diode electrically connected between the one side of said fourth resistor spaced from the one drop wire and said third transistor base electrode, and a third capacitor electrically connected between the one side of said fourth resistor and the first voltage, said fourth diode conducting in response to a transient current through said fourth resistor when the handset goes off hook for biasing said third transistor to conduct.
20. The ringer circuit according to claim 19 wherein said seventh means comprises a fifth diode electrically connected between the one side of said fourth resistor and the junction of said fourth diode and third capacitor; and wherein said eighth means comprises a fourth transistor responsive to the voltage on said third resistor during conduction of said third transistor and during charging of said second capacitor for effectively connecting the base electrode of said second transistor to the second voltage.
21. The ringer circuit according to claim 19 wherein said fifth means comprises a fifth resistor between the electrical connection of the fourth drop side lead of the hybrid circuit to the second voltage, and a fifth transistor having collector and emitter electrodes electrically connected between the third transistor base electrode and the second voltage, and having a base electrode electrically connected to said fifth resistor for sensing the voltage developed thereacross, said fifth transistor operating in a first one of two states when the handset is on hook and operating in the second state for producing a ring trip signal when loop current flows through said fifth resistor.
22. A ringer-power generator circuit for use in a subscriber carrier telephone system comprising a carrier subscriber station terminal that includes a carrier subscriber handset, the system producing pulses of station terminal ringing signal at the carrier subscriber station terminal in response to a central office ringing signal wherein a cycle of the station terminal ringing signal alternately comprises a ringing period including a series of pulses of ringing voltage followed by a silent period during which a constant voltage is present and these ringing pulses are absent, and including a two-wire drop associated with the carrier subscriber handset and a voice-frequency hybrid circuit of the carrier subscriber station terminal; one drop wire being connected between one of the tip and ring leads of the handset and a first drop side lead of the hybrid circuit; said ringer-power generator circuit comprising: a source of first and second reference voltage potentials for connection to second and third drop side leads of the hybrid circuits; first means responsive to voltage from said first source and producing both positive and negative DC ringer voltages, with respect to a neutral reference voltage output line thereof on associated output lines thereof, the magnitudes of the ringer voltages being greater than that of the pulses of ringing voltage; second means for connecting the neutral line of said first means to the one drop wire; said second means including a first resistor; third means which is a control means responsive to ringing pulses for causing said first means to produce said ringer voltages during a ringing period; a first diode having one side electrically connected to one of the output lines of said first means and having the other side electrically connected through the other drop wire to a fourth drop side lead on the hybrid circuit for decoupling the hybrid circuit from the one output line of said first means during generation of a ringer voltage thereby; fourth means responsive to the operation of said third means for connecting the other one of the Tip and ring leads of the handset alternately to the positive and negative ringer-voltage output lines of said first means throughout a ringing period of a ringing cycle for energizing a ringer of the handset; said fourth means continuously connecting the one output line of said first means to the other one of the tip and ring leads of the handset throughout the silent period of a ringing cycle; and fifth means which is a ring trip means responsive to an off-hook transient signal produced by the handset and sensed by said first resistor of said second means for initiating ring trip and for de-energizing said first means.
23. The ringer circuit according to claim 22 wherein said fifth means comprises: a first capacitor and second resistor electrically connected in series between said first and second voltages; a first transistor having emitter and collector electrodes connected across said first capacitor and having a base electrode; sixth means coupling the transient signal sensed by said first resistor to the base electrode of said first transistor for causing the latter to conduct to discharge said first capacitor; and seventh means responsive to the voltage on said second resistor during conduction of said first transistor for causing said third means to prevent said first means producing ringer voltages even during receipt of ringing pulses for initiating ring trip.
24. The ringer circuit according to claim 23 wherein said sixth means comprises: a second diode, which is a Zener diode, and a second capacitor electrically connected in series between said first transistor base electrode and the first potential, and a third diode electrically connected between the junction of said second diode and second capacitor and the one side of said first resistor that is spaced from the one drop wire.
25. The ringer circuit according to claim 24 wherein said fifth means comprises: a third resistor in the electrical connections of said third drop side lead of the hybrid circuit and the second voltage, and a second transistor having collector and emitter electrodes electrically connected between the first transistor base electrode and the second voltage, and having a base electrode electrically connected to said third resistor for sensing the voltage developed thereacross, said second transistor operating in a first one of two states when the handset is on-hook and operating in the second state for producing a ring-trip signal when loop current flows through the hybrid and said third resistor.
26. The ringer circuit according to claim 25 wherein said third means comprises: a third capacitor; a fourth resistor; a third transistor having a base electrode electrically connected in series through said fourth resistor and third capacitor to the first voltage; and having emitter and collector electrodes electrically connected between said first voltage and an input line to said first means for controlling energization of said first means.
27. The ringer circuit according to claim 26 wherein said third means comprises a fourth transistor being operable in two different operating states, having a base electrode to which the ringer pulses are applied, and having emitter and collector electrodes electrically connected in series between the second voltage and the junction of said fourth resistor and said third capacitor; and fourth transistor operating in the first state during the absence of a ringing pulse and operating in the second state during receipt of a ringing pulse for charging said third capacitor and for causing said third transistor to conduct to energize said first means; said third capacitor discharging through said fourth resistor and the third transistor base-emitter junction diode during operation of said fourth transistor in the first state for maintaining said third transistor conducting and said first means energized between receipt of ringing pulses during a ringing period.
28. The ringer circuit according to claim 27 wherein said third means comprises a fifth resistor electrically connected between said third transistor base electrode and the first voltage.
29. The ringer circuit according to claim 28 wherein said second means comprises fourth and fifth diodes which are Zener diodes electrically connected back-to-back and in series with said first resistor between the neutral line of said first means and the one drop wire.
30. The ringer circuit according to claim 29 wherein said seventh means comprises a fifth transistor responsive to a voltage on said second resistor during conduction of said first transistor therethrough and during charging of said first capacitor therethrough for effectively connecting the base electrode of said fourth transistor to the second voltage.
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