JPH01292958A - Power source circuit for automatic circuit incoming equipment - Google Patents

Abstract

PURPOSE:To reduce the consumption of a battery by turning on a power source of an incoming signal reception circuit and a detecting means at every prescribed time by an output signal of a clock circuit, turning on a main power source in case an incoming signal has been detected and starting a microprocessor. CONSTITUTION:The title circuit is provided with an incoming signal reception circuit 1 to which a supply of a power source VA provided on terminal equipments 11a-11d has been cut off, detecting means 3, 4 to which a supply of the power source VA for detecting an incoming signal from a main computer 8 has been cut off, and a clock circuit 5 to which a power source is supplied by a main power source of a battery in a microprocessor which has cut off a supply of a main power source VBAT. In this state, by an output signal of the clock circuit 5, the power source VA of the incoming signal reception circuit 1 and the detecting means 3, 4 is turned on at every prescribed time, and in case the incoming signal has been detected, the main power source VBAT is turned on so that the microprocessor 2 is started. In such a way, the consumption of the battery can be reduced.

Description

[Detailed Description of the Invention] [Summary] The purpose of this invention is to provide a power supply circuit for a line automatic call receiving device which is suitable for use in data communications, and which consumes less battery. In an automatic line termination device that transmits data between the terminal equipment and the main computer using incoming signals supplied to multiple terminal equipment, an incoming call signal when the power supply to the terminal equipment is cut off. a receiving circuit, a detection means for detecting an incoming signal from the main computer when the power supply is cut off, and a clock circuit powered by the main power of a battery in the microprocessor whose main power supply is cut off. and turning on the power of the incoming signal receiving circuit and the detecting means at regular intervals using the output signal of the clock circuit, and when an incoming signal is detected, turning on the main power and starting the microprocessor. Configure it so that it does.

[Industrial application field]

The present invention relates to a power supply circuit for an automatic line receiving device suitable for use in data communications.

[Conventional technology]

Various types of data communication have been proposed in the past, including database services, personal computer communication services, and inter-personal computer communication. In particular, when communicating between computers, the transmission speed is about 300 baud or 1200 baud when sending and receiving data using a modem and a telephone line between computers, and it takes a long time when sending large amounts of data. There was a problem in that the transmission waiting time was increased because of the need for the transmission.

For example, when transmitting data from a terminal device to a host computer, the host computer must be called over the phone to confirm whether the host computer is ready to accept the data, and then the data will be sent at the agreed time. It was necessary for a person to be present at the terminal device at all times in order to perform the transmission. Also, since the telephone line is busy during the day, it is preferable to automatically transmit the message without manual intervention during the night when the telephone line is free. An automatic line termination device has been proposed in which a host computer supplies an incoming call signal to a terminal device, and when the incoming signal is received, the terminal device automatically starts transmitting data.

In such automatic line receiving devices, especially handy belt terminals, etc., the main power supply to the microprocessor 2 is cut off, as shown in Fig. 4, but incoming calls from a modem, etc. input from the input terminal T, The receiving circuit 1 that receives the signal Ci is always supplied with the main power source 11A7 and is in a power-on state, and when an incoming signal is received, the microprocessor operates and transmits data from the output terminal T3.

[Problem to be solved by the invention]

According to the above-mentioned conventional configuration, if the line automatic call receiving device is a portable device such as a handy belt terminal and is often operated by a battery, if the receiving circuit 1 is always in operation, the waiting time may be particularly long. However, there was a problem in that the current consumption always exceeded a certain value, consuming the battery.

The present invention has been made in view of the above-mentioned drawbacks, and an object of the present invention is to provide a power supply circuit for an automatic call receiving device that consumes less buffer power.

[Means to solve the problem]

The power supply circuit for the automatic line receiving device of the present invention is shown in FIGS. 1 and 2.
As shown in the figure, a line automatic termination device 12 is adapted to transmit data between the terminal devices 11a-1id and the main computer 8 using incoming signals supplied from the main computer 8 to the plurality of terminal devices 11a-lid. In,
The incoming signal receiving circuit 1 provided with the terminal devices 11a to lld is cut off from the power source (1), and the detection means 3.4 is cut off from the power source VA for detecting the incoming signal from the main computer 8. The clock circuit 5 is equipped with a clock circuit 5 which is supplied with power from the main power source of the battery in the microprocessor 2 from which the supply of the main power supply V IIAT has been cut off, and the incoming signal receiving circuit 1 and Detection means 3
．． 4 power supply■. is turned on, and when an incoming signal is detected, the main power supply VIIA is turned on and the microprocessor 2 is activated.

[For production]

The power supply circuit for an automatic call receiving device according to the present invention uses a clock circuit 5 which always supplies power from the battery even if the main power source (1) or (a) from the battery is not supplied to the microprocessor 2 and is disconnected. The power supply voltage is applied to the incoming signal receiving circuit 1 at regular intervals to monitor the incoming signal, and if an incoming signal is detected, the main power supply V! Data transmission can be performed in order to turn on the IA and start up the microprocessor, making it possible to extremely reduce battery consumption.

[Embodiment] Hereinafter, an embodiment of the power supply circuit for an automatic call receiving device according to the present invention will be described in detail with reference to FIGS. 1 to 3.

Although FIG. 1 shows a system diagram of the present invention, the data communication method of the present invention will be explained with reference to FIG. In FIG. 2, the host computer 8 is a personal computer located at a company's headquarters, for example, and an incoming signal C is sent from the personal computer via a modem 9.
i is converted into an analog signal in order to be sent to the public telephone line 10. Terminal equipment may be located, for example, at several business offices of a company.
c.

The incoming signal C4 from the public telephone line IO is converted into a digital signal by the modem in the handy belt terminal 1la-11d, and then sent to the input terminal T1 (Fig. 1).
is input. The incoming call signal Ci corresponds to the ringing tone of a normal telephone bell, and this ringing tone is converted to a predetermined frequency and transmitted to the public telephone line 10, and has a predetermined duration (as shown in FIG. 3(a)). For example, when the terminal device 11 receives an incoming signal C1 of 1 second duration three times in succession
3-lid start data transmission from the terminal device 11a-1id to the host computer 8 upon receiving the incoming signal C4.

When the host computer 8 becomes ready for reception, it transmits an incoming signal Ci indicating that data transmission may be performed to one of the plurality of terminal devices. This incoming call signal Ci is supplied to input terminals T1 of predetermined terminal devices 11a-lid. For example, if an incoming signal Ci is sent to the terminal device 11a, the terminal device 11a is configured like the line automatic incoming call device 12 shown in FIG. is connected to the voltage source 4, and its output is connected to one input terminal of the AND gate circuit 3. Furthermore, it is also connected to the microprocessor 2 in the automatic line termination device 12. The voltage source VA connected to the incoming signal receiving circuit 1 is in a substantially cut-off state while waiting for an incoming signal, as will be described later.

The main power supply VIll of the line automatic call receiving device 12, that is, the battery is a clock circuit (clock LSI) 5 that is constantly driven.
and a detection pulse forming circuit 6 driven by this clock circuit 5
It is connected to the power supply and constantly supplies voltage. A pulse C with a width of 0.5 ms is generated by the detection pulse forming circuit 6 at a constant cycle as shown in FIG.
is supplied to the other input terminals of the AND gate circuit 3 and the OR gate circuit 7.

The off-gate circuit 7 is also constantly backed up by a battery and supplied with voltage from the main power supply VIAT. One input terminal of the OR gate circuit 7 is connected to the output terminal of the flip-flop circuit 4, and its output is connected to the base of the second transistor Trz. Second transistor Tr! The collector of is Wraith Ill! The emitter connected to XVIAT is supplied as a voltage source vA to the above-mentioned incoming signal receiving circuit 1, AND gate circuit 3, and flip-flop circuit 4 which will be explained from now on.

The output pulse B of the AND gate circuit 3 is supplied to the set terminal of the flip-flop circuit 4, and 1'' input is given to the other input terminal, and the reset pulse R3T from the microprocessor 2 is also given to the reset terminal R3TF. , the incoming signal Ci as shown in FIG. 3(a) is input to the input terminal T,
If the incoming signal receiving circuit 1 is supplied with voltage source ■
Therefore, the detection pulse forming circuit 6 is in the "off" state where no voltage is supplied, but each time the pulse C shown in FIG. The signal is intermittently supplied to the circuit 3 and the flip-flop circuit 4.

Therefore, as shown in FIG. 3(b), the output pulse C4 of the incoming signal receiving circuit 1 is "high" in both the pulse C (FIG. 3(C)) and the incoming signal Ci (FIG. 3(a)). In this state, the AND gate circuit 3 outputs a pulse B shown in FIG. At the rising edge of pulse B, flip-flop circuit 4
is set and latched, and the pulse A shown in FIG. 3(e) is supplied to the microprocessor 2 as an interrupt signal iRQ, and the first transistor Tr is turned on in order to Main power supply V! I
A? is supplied to the microprocessor 2 via the emitter as a voltage 8 as shown in FIG. It registers that the incoming signal C1' has been input once within the period of time, and sends a reset pulse RE shown in FIG. 3 (hl) from the reset terminal R3Tc to the reset terminal R3TF of the flip-flop circuit 4.
S is supplied and the power is turned off (falling point AD in Figure 3 (Q)). When such a registration operation for the incoming signal C4 is performed three times, the microprocessor 2 does not supply the reset pulse RES to the flip-flop circuit 4 as shown in FIG. The microprocessor 2 detects this and starts data transmission from the terminal device 11a to the host computer 8 side.

The voltage tAvA is supplied as a power supply voltage to the incoming signal receiving circuit 1, the AND gate circuit 3, the flip-flop circuit 4, etc. with the OR gate circuit 7 gated as shown in FIG. If the incoming signal C4 is not supplied to the incoming signal receiving circuit 1, this voltage V is as shown in FIG.
When the pulse C from the detection pulse forming circuit 6 shown in C) is 0.
It is only "on" for 5ms, and the current flowing through the LSIs such as the incoming signal receiving circuit 1, AND gate circuit 3, and flip-flop circuit 4 is only leakage current, and hardly consumes the battery. A power supply circuit for a line receiving device that can suppress consumption of the line is obtained.

〔Effect of the invention〕

The present invention has the effect of providing a power supply circuit for a line receiving device that can automatically perform data communication during times when public telephone lines are idle and can minimize battery consumption.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing an embodiment of the power supply circuit for a line terminating device of the present invention, FIG. 2 is a system diagram of a communication system in which the line terminating device of the present invention is used, and FIG. The operating waveform diagram, Figure 4, is a power supply circuit diagram for a conventional line receiving device. DESCRIPTION OF SYMBOLS 1... Incoming signal receiving circuit, 2... Microprocessor, 3... AND gate circuit, 4... Flip-flop circuit, 5... Clock circuit, 6... Detection pulse forming circuit. Patent applicant Fujitsu Kiden Ltd. IZRI 4961 Figure 4

Claims (1)

[Scope of Claims] An automatic line termination device configured to transmit data between a terminal device and a main computer using incoming signals supplied from a main computer to a plurality of terminal devices, comprising: An incoming signal receiving circuit whose power supply has been cut off, a detection means whose power supply has been cut off for detecting an incoming signal from the main computer, and a main power source of a battery in the microprocessor whose main power supply has been cut off. and a clock circuit to which power is supplied, and the incoming signal receiving circuit and the detecting means are powered on at regular intervals using the output signal of the clock circuit, and when an incoming signal is detected, the main power supply is turned on. A power supply circuit for an automatic line receiving device, characterized in that the power supply circuit for an automatic line receiving device is activated by inputting the above microprocessor.