Power supplying to CPU of telephone

Details Power supplying to CPU of telephone Power supplying to CPU of telephone

1998-07-28

2001-10-16

Chan, Wing F. (Department: 2613)

Telephonic communications

Subscriber line or transmission line interface

Power supply

C379S413000, C379S399010

Reexamination Certificate

active

06304656

ABSTRACT:

FIELD OF THE INVENTION
The present invention is related to a device for providing power for the CPU of a telephone, and more particularly to a device activated upon receiving a coming phone call for supplying power to the CPU of a telephone for a predetermined period.
BACKGROUND OF THE INVENTION
For a current telephone, a central processing unit (CPU) is used to control the telephone. The great performance of a CPU enhances the functions and applications of a telephone. Among the work terms of the CPU, one of them is to control the communication of the telephone with a telephone switchboard of the telephone company.
Please refer to
FIG. 1
which is a schematic block diagram showing a conventional telephone. The telephone shown in
FIG. 1
includes a hook switch
11
, a state detector
12
, a CPU
13
, a control circuit
14
, an electronic switch
15
, a voltage regulator
17
, a battery
18
, and a downstream circuit
16
including a plurality of devices such as a speech processor, a voice amplifier, etc. When a phone call is made, a ringing signal is transmitted from the telephone switchboard
10
to the target telephone
1
to inform a user of the coming phone call.
When the user picks up the receiver (not shown) of the telephone, the hook switch
11
is conducted to be short-circuited so that the state detector
12
will inform the CPU
13
of the off-hook state. The CPU
13
then has the control circuit
14
conduct the electronic switch
15
to transmit speech signals from the switchboard
10
to the downstream circuit
16
. Meanwhile, a power signal accompanying the speech signals and transmitted along the telephone line will be stabilized through the voltage regulator
17
as a working power signal, and fed to the CPU
13
. The working power signal enters the downstream circuit for further conduction, and provides stable power for the CPU
13
. The battery
18
, however, provides power for the CPU
13
to monitor the hook state before the power transmitted along the telephone line achieves the CPU
13
.
In the conventional telephone, it is necessary for the CPU
13
to keep an eye on the state of the hook switch
11
, and the power needed for such a frequent monitoring operation is provided by the battery. Consequently, the life span of the CPU
13
will be quite limited, and the CPU will not be able to activate the electronic switch
15
if the battery
18
is power-empty.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an automatic power supplying device which supplies power to a CPU of a telephone after there comes a phone call and before the power transmitted along the telephone line achieves the CPU, and provides power to conduct a downstream circuit.
The present invention is related to an automatic power supplying device of a telephone for supplying power when a phone call is directed to the telephone. The automatic power supplying device includes a switch for controlling a conduction of the phone call; a digital controller electrically connected to the switch for detecting the conduction of the phone call, and controlling a downstream operation concerning the phone call; and a recharging circuit electrically connected to the switch and the digital controller, and enabled by the conduction of the switch to provide power for the digital controller for a predetermined period.
The switch can be a button switch or a hook switch. The digital controller is preferably a central processing unit. The predetermined period is a time period less than 0.1 second.
Preferably, the automatic power supplying device further includes a voltage regulating circuit electrically connected to the digital controller. The digital controller receives a power signal accompanying the phone call and stabilized through the voltage regulating circuit as working power after the predetermined period. The voltage regulating circuit preferably include an electronic switch for controlling a conduction of a downstream circuit of the telephone; a control circuit electrically connected between the digital controller and the electronic switch for conducting the electronic switch in response to a control of the digital controller; and a voltage regulator electrically connected to the electronic switch, the digital controller and the recharging circuit for receiving a source power accompanying the phone call through the electronic switch, stabilizing the source power to obtain the power signal provided for the digital controller, and disabling the recharging circuit after the predetermined period.
The electronic switch can be a transistor.


REFERENCES:
patent: 5555301 (1996-09-01), Boike et al.

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