JPH10257134A - Waiting power source device for telephone line equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waiting power source device for a telephone line equipment in which a waiting power can be absent by interposing it between a telephone line equipment 2 connected with a telephone line such as a facsimile equipment or an MODEM and the telephone line. SOLUTION: This device is provided with an incoming call detecting means PhoS which detects an incoming call, off-hook detecting means PhoC1 and PhoC2 which detect off-hook, inside power source circuit PS, and switching means RL1 and RL2. The inside power source circuit PS starts an operation when the incoming call detecting means PhoS detects an incoming call, and the switching means RL1 and LR2 starts the supply of a commercial power supply voltage to a telephone line equipment according to this, and continues the supply until on-hook or until the lapse of a prescribed time from the on-hook even after off-hook is detected by the off-hook detecting means PhoC1 and PhoC2. This device is provided with timers TM1 and TM2 which clock this passing prescribed time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a standby power supply for telephone line equipment, and more particularly to a standby power supply for telephone line equipment capable of eliminating power consumption during standby.

[0002]

2. Description of the Related Art Generally, a facsimile is normally turned on so that it can be automatically received whenever it is transmitted, and therefore consumes power when it is not receiving, that is, in a standby state.

The power consumption during standby, that is, standby power is usually about 10 W.

[0004]

Consumption of standby power of, for example, 10 W in a state where no signal is received is a wasteful consumption of power that cannot be ignored for a user. Electricity rates are also not negligible.

The present invention has been made to solve such a problem, and is interposed between a telephone line device connected to a telephone line such as a facsimile or a modem and the telephone line. An object of the present invention is to provide a standby power supply device for telephone line equipment capable of reducing standby power of telephone line equipment to zero.

[0006]

According to a first aspect of the present invention, there is provided a standby power supply for telephone line equipment, comprising: an incoming call detecting means for detecting an incoming call; an off-hook detecting means for detecting an off-hook; an internal power supply circuit; The internal power supply circuit starts operating when the incoming call detecting means detects the incoming call, and the switching means starts supplying the commercial power supply voltage to the telephone line equipment accordingly, and the off-hook detecting means After the off-hook is detected, the supply is continued until the on-hook or until a predetermined time elapses from the on-hook.

Therefore, according to the standby power supply for telephone line equipment of the first aspect, when there is an incoming call, the supply of the commercial power supply to the telephone line equipment is started by the switching means along with the start of the operation of the internal power supply circuit, Even when the telephone goes off-hook, the supply continues until the telephone goes on-hook or until a predetermined time elapses after the on-hook, so that the telephone line device and the telephone line device standby power supply itself (mainly the internal power supply circuit) consume power during standby. Never. Therefore, the standby power can be reduced to zero.

According to a second aspect of the present invention, there is provided the standby power supply for telephone line equipment according to the first aspect of the invention, wherein the standby power supply for the telephone line equipment measures a predetermined time for continuing supply of the commercial power supply voltage to the telephone line equipment even after on-hook. It has a built-in timer.

According to the second aspect of the present invention, the supply of the commercial power supply to the telephone line device can be continued for the time measured by the timer even when the telephone line device goes on-hook. Therefore, even if the telephone call ends, the telephone line device can continue the operation related to the reception and requiring the continuation for the required period, and the continuation period can be accurately set by the timer.

According to a third aspect of the present invention, there is provided the standby power supply for telephone line equipment according to the first or second aspect, wherein the power supply is turned on to forcibly supply a commercial power supply voltage to the telephone line equipment. It has a closing switch.

According to the third aspect of the present invention, the commercial power supply voltage can be forcibly applied to the telephone line device by turning on the power supply forcible switch, thereby enabling transmission and the like. .

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention comprises an incoming call detecting means for detecting an incoming call, an off-hook detecting means for detecting an off-hook, an internal power supply circuit, and a switching means. The circuit starts operating in response to the incoming call detection, and the switching means starts supplying the commercial power supply voltage to the telephone line equipment in accordance therewith. After the off-hook detecting means detects the off-hook, the supply is continued until the on-hook or from the on-hook. This is to continue until a predetermined time elapses. Therefore, when there is an incoming call, the supply of the commercial power supply to the internal power supply circuit and the telephone line equipment is started by the switching means. Phone line equipment and telephone line equipment during standby Use the standby power supply itself (primarily the internal power supply circuit) is not consuming power. Accordingly, the standby power can be reduced to zero.

Further, in another embodiment, a timer for measuring a predetermined time for continuing the supply of the commercial power supply voltage to the telephone line equipment after the on-hook is incorporated in the above-described embodiment. In this case, the supply of the power supply voltage to the telephone line device can be continued for the time measured by the timer. Therefore, even when the telephone call ends, the telephone line device can continue the operation related to the reception and requiring the continuation for the required period, and the continuation period can be accurately set by the timer.

In still another embodiment, a power-on switch for turning on the power supply for forcing the supply of commercial power to the telephone line equipment is provided. The commercial power supply voltage can be forcibly turned on, and transmission can be performed.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the illustrated embodiments. FIG. 1 is a circuit diagram showing a first embodiment of a standby power supply for telephone line equipment according to the present invention. CN1 is a connector to which a telephone line from NTT or the like is connected; CN2 is a connector to which a wire connected to a telephone line connection terminal of a telephone line device such as a facsimile not shown in FIG. 1 is connected;
Is a photothyristor, which has two photodiodes on the input side, the two photodiodes are connected in parallel with opposite polarities, and the photodiodes connected in antiparallel are connected between two lines of a telephone line. Is connected via a series circuit composed of a resistor R2 and a capacitor C2, and detects an incoming call. Specifically, when an incoming call is detected, the output side, that is, the thyristor side is turned on and becomes conductive.

CN3 is a third connector into which an AC cord plug of a telephone line device such as a facsimile is inserted.
CN4 is a fourth connector, into which a plug at the other end of the AC cord connected to a plug having one end inserted into an AC outlet is inserted. Then, the third and fourth connectors CN
3, one terminal of CN4 is connected to each other, and the other terminal of the fourth connector CN4 is connected to one terminal on the output side of the photothyristor PhoS. The other terminal on the output side of the photothyristor PhoS is connected to one input terminal of a power supply circuit PS described later.

RL1 is a first relay, RL2 is a second relay, and one terminal of an exciting coil K1 of the first relay RL1 is connected to a make contact of the second relay RL2 and one of an internal power supply circuit PS to be described later. And the other terminal is connected to the one terminal of the third and fourth connectors, which is connected to each other. And the relay RL
One common terminal is connected to the common terminal of the second relay RL2 and the other terminal of the fourth connector CN4, and the make contact is connected to the other terminal of the third connector CN3.

PS is an internal power supply circuit of the standby power supply for telephone line equipment. One of the input terminals for receiving the commercial power supply voltage is connected to one of the terminals of the third and fourth connectors CN3 and CN4 and the first relay RL1. The other input terminal of the exciting coil K1 is connected to one of the output terminals of the photothyristor PhoS. The power supply circuit PS rectifies and smoothes the received AC voltage to obtain a DC voltage. This DC voltage is supplied as a power supply voltage to each unit of the standby power supply for telephone line equipment. The other output terminal of the photothyristor PhoS is connected to the other terminal of the fourth connector CN4.

PhoC1 and PhoC2 are photocouplers whose input sides are connected in anti-parallel, whose output sides are connected in parallel, and whose input side is connected in parallel with a resistor R1 and a capacitor C, respectively. The first and second photocouplers P and P are arranged so that an input side thereof, that is, a phototransistor connected in parallel, is interposed between the telephone line and the telephone line device, in other words, a call signal passes through the input side.
hoC1 and PhoC2 are connected and call detection is performed. Specifically, the output side, that is, the phototransistor,
Conduction occurs when off-hook, and non-conduction when on-hook.

Then, the photocouplers PhoC1 and PhoC1
C2 is a phototransistor whose emitter is ground G
ND (negative terminal of the power supply circuit PS),
The collector is connected to a power supply voltage (Vcc) terminal (plus terminal) of the power supply circuit PS via a resistor R3. O
R is an OR circuit that receives an inverted input and outputs a logical sum of the OR circuit. One input terminal of the OR circuit is the photocoupler PhoC.
1. Connected to the connection point between (the collector of) PhoC2 and the resistor R3. DRV is a driver that inverts and amplifies the output signal of the OR circuit OR.

The exciting coil K2 of the second relay RL2
Represents an output terminal of the driver DRV and a power supply voltage (Vc
c) connected between the power supply circuit PS and the terminal, and is driven when the output level of the driver DRV goes low (assuming, of course, that the power supply circuit PS is operating), and goes high. It becomes a non-driving state.

TM1 and TM2 are timers whose terminals C
X1 and CX2 are ground (-side) terminals, RXCX
(1), RXCX (2) is a terminal for designating the clocking time, and a resistor R
4, the output of the time constant circuit by C3 and the output of the time constant circuit by resistors R7 and C6, and the magnitude of the time constant (R
4. C3 or R7 C6) can change the clocking time.

/ TR (1) and / TR (2) are inversion trigger input terminals, and when they become 0 V, timers TMa and TMb
Starts timing. The trigger input terminal / TR (1),
/ TR (2) is a resistor R3 and the photocoupler PhoC
1, connected to the connection point with PhoC2. In this specification, the symbol "/" before a symbol is used in place of a bar. TR (1) and / TR (2) are trigger input terminals of TRUE.

/ RESET (1), / RESET (2)
Is an inverting reset input terminal, which resets when it goes low. / Q1 and / Q2 are inverting output terminals of the timers TMa and TMb, and change from a normal high level to a low level when a predetermined time (determined by the time constant of the time constant circuit) elapses. The inverted reset input terminals / Q1, / Q
2 is connected to each other input terminal of the OR circuit OR. SW is a switch that is turned on when a call is transmitted from the telephone line device side, and is connected in parallel with the output of the photothyristor PhoS.

Next, the operation of the standby power supply for telephone line equipment shown in FIG. 1 will be described.

(1) Normal Time (Standby Time) Normally, a constant DC voltage is applied between two telephone lines. In this state, the photocoupler Pho
C1, 2 and the photothyristor PhoS are kept off. Therefore, relay RL1 is kept in a non-operating (non-excited) state, and no commercial power supply voltage is applied to power supply circuit PS. Therefore, the power supply circuit PS is in a non-operating state, and the relays RL2 and RL1 cannot operate. That is, the non-operation (non-excitation) state is maintained. Therefore, the commercial power supply voltage coming from the AC outlet to the connector CN4 is not transmitted to the connector CN3. The power consumption of the standby power supply for telephone line equipment during this standby is 0 W.

(2) At the time of incoming call At the time of incoming call, that is, when a call comes, the voltage of the telephone line changes from a DC voltage to an alternating voltage of a constant frequency. Then, the light emitting diode of the photo thyristor PhoS is turned on, the thyristor is turned on, and the internal power supply circuit PS of the standby power supply for telephone line equipment receives an AC input. At the same time, the coil K2 of the relay RL2 is excited, and its make contact is connected to the common terminal.
The commercial power supply voltage arriving at the fourth connector CN4 is transmitted to the third connector CN3 through the relay RL1. Accordingly, the commercial power supply voltage is applied to the telephone line device whose AC cord is connected to the third connector. On the other hand, the output of the driver DRV becomes high level, and the coil K2 of the relay RL2 becomes non-conductive.

It goes without saying that the call signal from the telephone line is transmitted to the telephone line device through the second connector CN2.

(3) Off-hook (during a call) When the telephone line equipment goes off-hook in response to the call, the photo-salister PhoS immediately becomes non-conductive, and the supply of the commercial power supply voltage to the internal power supply circuit PS is stopped. However, the output voltage of the internal power supply circuit PS continues to be generated for several tens of milliseconds to several seconds even after the input of the AC voltage is stopped. When the telephone goes off-hook, a signal current flows through the telephone line, and the photocoupler Pho
The light-emitting diodes C1 and PhoC2 are turned on, whereby the level on the collector side of the phototransistor becomes low.

Then, the output of the OR circuit OR changes from low level to high level, and the output of the driver DRV changes to low level. Then, the second relay RL2 is excited and the common terminal thereof is connected to the make contact, so that the supply of the commercial power supply voltage to the internal power supply circuit PS is continued, and the commercial power supply voltage is supplied to the telephone line equipment. The supplied state is maintained.

(4) At the time of on-hook (end of call) When the call ends, that is, when the telephone goes on-hook, the telephone line returns to the original state (standby state), and as a result, the photocouplers PhoC1 and PhoC2 return to the off state. . Then, the collector level of the phototransistor is inverted from the low level to the high level. As a result, the timer T
Ma and TMb start timing. At this time, the levels of the output terminals / Q1 and / Q2 of the timers TMa and TMb are inverted from the high level to the low level.
The output of R does not change even though the collector levels of the photocouplers PhoC1 and PhoC2 are inverted. Therefore,
Supply of commercial power to the telephone line equipment and the internal power supply circuit PS is still continued.

As described above, the supply of power to the telephone line device is continued even after the call ends because the operation that the telephone line device has to perform with respect to the call after the call ends is still finished. Because there is no. Although the time during which the operation should be continued after the end of the call is not constant depending on the type of telephone line equipment, it is generally sufficient that the time is about 10 seconds. However, in the standby power supply device for telephone line equipment, the timer TM1 and TM2 are set accurately to 30 seconds in consideration of a margin.

(5) Termination of Timekeeping by Timer When the timekeeping is completed, the levels of the output terminals / Q1 and / Q2 of the timers TMa and TMb are inverted to the high level. Then, the output of the OR circuit OR is inverted to a low level, and the output of the drive circuit 10 is inverted from a low level to a high level. As a result, the relay RL2 is in a non-excited state. Then, the relay RL1 is also de-energized, so that the supply of the commercial power to the telephone line device is stopped, and the supply of the commercial power to the internal power supply circuit PS is also stopped. This returns to the standby state.

(6) When transmitting from the telephone line device side When transmitting from the telephone line device side, the switch SW (power forced on switch) is pressed. Then, since the commercial power supply voltage enters the telephone line device side, the telephone line device becomes operable. Then, a necessary operation for the telephone line device may be performed. Then, when the call ends and the necessary operation of the device after the call accompanying the call ends, the switch SW may be turned off. However, since the telephone line goes into an on-hook state when the call is over, the timers TM1 and TM2 automatically start operating, and the supply of the commercial power supply voltage to the telephone line device continues until the time measurement ends.
There is no problem if the switch SW is turned off immediately after the end of the call.

Even if the transmission is not to be performed, the switch SW may be turned on to check the condition of the telephone line equipment or to perform other operations.

Also, by making a call from the telephone line device without pressing the switch SW, the standby telephone device for the telephone line device can operate according to the same operating principle as when a call is received from another party. Therefore, the switch SW is useful when a commercial power supply voltage needs to be supplied to check the condition of the device without using a telephone.

As the telephone line equipment to which the present invention can be applied, there are a facsimile, a modem, an answering machine and the like.

[0038]

According to the first aspect of the present invention, when an incoming call is received, the supply of the commercial power supply voltage to the telephone line device is started by the switching means. Or until the predetermined time elapses after the on-hook operation, the telephone line device and the standby power supply for the telephone line device itself (internal power supply circuit) do not consume power during standby. Therefore, the standby power can be reduced to zero.

According to the second aspect of the present invention, the supply of the power supply voltage to the telephone line device can be continued for the time measured by the timer even when the telephone line device goes on-hook. Therefore, even if the telephone call ends, the telephone line device can continue the operation related to the reception and requiring the continuation for the required period, and the continuation period can be accurately set by the timer.

According to the third aspect of the present invention, the commercial power supply voltage can be forcibly supplied to the telephone line device by turning on the power supply forcible switch, thereby enabling transmission and the like.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a first embodiment of a standby power supply for telephone line equipment of the present invention.

[Explanation of symbols]

RL1, RL2: switching means, PS: power supply circuit, PhoS: incoming call detection means, PhoC1, P
hoC2: Call detection means, TM1, TM2: Timer, SW: Power-on forced switch.

Claims (3)

[Claims] 1. An incoming call detecting means connected to a telephone line for detecting an incoming call, an off-hook detecting means connected to a telephone line for detecting an off-hook, an internal power supply for generating an internal DC power supply voltage when receiving commercial power And a switching means for switching supply of commercial power supply voltage to telephone line equipment. The internal power supply circuit is configured to start operating when the incoming call detection means detects an incoming call. Starts the supply of the commercial power supply voltage to the telephone line equipment when the incoming detection means of the internal power supply circuit detects an incoming call, and after the off-hook detection means detects the off-hook, the supply is continued until the on-hook or a predetermined time has elapsed from the on-hook. Standby power supply for telephone line equipment characterized by being continued until 2. The standby power supply for telephone line equipment according to claim 1, further comprising a timer for measuring a predetermined time for continuing supply of the commercial power supply voltage to the telephone line equipment even after on-hook. 3. A standby power supply for telephone line equipment according to claim 1, further comprising a power supply forcible power-on switch for forcing supply of a commercial power supply voltage to the telephone line equipment when turned on.