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1. (WO1984000270) APPARATUS FOR CONTROLLING THE APPLICATION OF TELEPHONE LINE POWER IN A TELEPHONE SET
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What is claimed is:
1. A telephone line-powered feature telephone set comprising
power supply means (401),
a data processor (210) for recognizing user actuation of features,
means for providing a feature requiring a higher than normal operating voltage for proper operation, and
a telephone impedance switch (202) for switching a resistance in series with telephone transmission and reception circuitry (580), the data processor (210), recognizing a requirement for increased resistance of the telephone set, actuating the telephone impedance
switch (202), the impedance switch (202) causing a higher than normal voltage to appear across terminals (IN1 and IN2) of the telephone set, the higher than normal voltage being provided through the power supply means (401) to the means for providing the feature requiring the higher voltage for proper operation.
2. A telephone line-powered feature telephone set as recited in claim 1, the power supply (401)
CHARACTERIZED BY
first and second charging inputs derived from the telephone line side and telephone transmission and reception circuitry side, respectively, of a dial pulsing transistor (Q501).
3. Apparatus for controlling the application of telephone line power in a telephone set including power storage means
CHARACTERIZED BY
a voltage threshold detection circuit (301) for comparing the voltage level available from the power storage means (C401) with a minimum threshold voltage level for operating power-consumptive components (210, 240, 250) of the telephone set, the voltage threshold detection circuit actuating the components when the available voltage level exceeds the minimum threshold level and deactuating the components when the available voltage level is below the minimum threshold level.
4. Apparatus for controlling the application of telephone line power in a telephone set as recited in claim 3
FURTHER CHARACTERIZED BY
data processing means (210) having associated peripheral components (240, 250) and an associated random access memory (220), the random access memory being continuously provided with power; the data processing means, responsive to a signal provided by the voltage threshold detection circuit (301), shutting down both its own operation and the operation of its associated
peripheral components.
5. Apparatus for controlling the application of telephone line power in a telephone set as recited in claims 3 or 4
CHARACTERIZED IN THAT
the power storage means (C401) is charged by the application of telephone line power to the teleohone set.
6. Apparatus for controlling the application of telephone line power in a telephone set
CHARACTERIZED BY
a keyboard circuit (230) comprising row and columnar switch elements scanned by a data processing means (210); one switch element (232), upon its actuation while the data processing means is shut down, providing a signal to an actuating circuit (205); the actuating circuit in turn actuating a voltage threshold detection circuit (301) for comparing the voltage level output of a power storage means (C401) with a minimum threshold voltage level and for causing a start signal to be provided to the data processing means in the event that the voltage level output of the power storage means exceeds the minimum threshold voltage level.

7. Apparatus for controlling the application of telephone line power in a telephone set as recited in claim 6
FURTHER CHARACTERIZED IN THAT
the data processing means upon receiving the start signal performs a scan of the keyboard (230) and, in the event the result of the scan is an indication that the particular actuated switch element (232) remains in an actuated state, the data processing means latches the power supply start circuit (205).
8. A power supply for a telephone set
CHARACTERIZED BY
a first supply (PR1) comprising a first power storage means (C401),
a second supply (PS) comprising a second power storage means (C402),
a regulator (420) for regulating the charging of the first and second power storage means during an off-hook condition of the telephone set, and
a regulator (410) for regulating the charging of the first and second power storage means during an on-hook condition of the telephone set.
9. A power supply for a telephone set
CHARACTERIZED BY
first and second charging inputs, a first input connected to the telephone line side of a dial pulsing means (Q501) and a second input connected to telephone transmission and reception circuitry (580), and
first and second regulator circuits connected to the first and second charging inputs, respectively, the regulator circuits precluding an unwanted discharge of the power supply.
10. A power supply for a telephone set as recited in claim 9
FURTHER CHARACTERIZED BY
first and second power storage means (C401 and C402), one power storage means providing continuous DC voltage to a random access memory (220) of a data
processor (210) .
11. A power supply for a telephone set as recited in claim 8, 9, or 10
FURTHER CHARACTERIZED BY
an actuator circuit (205) responsive to either the switching of a switch element (232) of a keyboard associated with the telephone set or an off-hook condition of the telephone set, the actuator circuit actuating the provision of power to power-consumptive
components (210, 240, 250) of the telephone set.
12. Apparatus for controlling the application of telephone line power in a telephone set
CHARACTERIZED BY
switching means (270) for increasing the
resistance of the telephone set, the increased resistance increasing the telephone line voltage appearing at
terminals (IN1 and IN2) of the telephone set and, thereby, causing the voltage across particular power-consumptive components (160) to increase, and
data processing means (210) for controlling operation of the switching means, the data processing means actuating the switching means responsive to the actuation of certain telephone set features, the features necessitating the actuation of the particular power-consumptive components requiring an increased voltage for proper operation.
13. A telephone impedance switch for a feature telephone set
CHARACTERIZED BY
telephone line voltage monitoring means for monitoring the level of telephone line voltage and
current amplifier means responsive to the telephone line voltage monitoring means, the current amplifier means providing sufficient current to operate the telephone impedance switch.

14. A voltage threshold detection circuit for detecting whether an input voltage exceeds a threshold value
CHARACTERIZED BY
a self-biasing means (R303, R304, Q304) for providing a reference current, the reference current (I1, I1+I3) being a function of the input voltage, the self- biasing means further providing compensation from
temperature changes.
15. A voltage threshold detection circuit as recited in claim 14
FURTHER CHARACTERIZED IN THAT
the self-biasing means is associated with a current mirror circuit (Q301, Q302, Q303), the current mirror circuit feeding forward the reference current
(I1, I1+I3) and, as the input voltage increases, causing a derived current (I2) to flow, the derived current (I2) for actuating an output transistor (Q305).
16. A voltage threshold detection circuit as recited in claim 15
CHARACTERIZED IN THAT
the current mirror circuit comprises at least two bipolar transistors (Q301, Q302), an input leg
transistor (Q301) and an output leg transistor (Q302), the input leg transistor (Q301) having an emitter degeneration resistor (R301).
17. A voltage threshold detection circuit as recited in claim 14
FURTHER CHARACTERIZED IN THAT
the self-biasing means comprises a
transistor (Q304) having its collector to emitter path connected in series with a resistor (R304), the
combination being in parallel with a current bypass resistor (R303) and providing the reference current (I1, I1+I3).

18. A telephone line-powered feature telephone set comprising
power supply means (401),
a voltage threshold detector (301) for
monitoring the voltage level provided by the power supply means, and
a data processor for controlling the provision of features by the telephone set,
the voltage threshold detector, responsive to a low voltage condition, deactuating the data processor, the data processor entering a low energy mode of operation.
19. In a line-powered feature telephone set, a method for powering down a processor (210) comprising the step (704) of repeatedly monitoring particular input means (VSD4) for an "on-hook" condition and, if the telephone is on-hook, the step (708) of entering a low energy mode of operation
CHARACTERIZED BY
the additional step (703) of repeatedly
monitoring particular input means (VSD3) for a low voltage condition, before entering the low energy mode of
operation, the low voltage condition being the result of insufficient line voltage provided to a power supply (401) of the telephone set.