JPS63981B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides terminal control that operates with two power supply systems: a station power supply system for operating basic call functions and an AC power supply system for operating additional functions such as display and data transmission. The present invention relates to a signal separation control method for the device.

In addition to telephones, it is easy to connect facsimile equipment and data transmission equipment to the digital telephone network, and the terminal control equipment for this purpose has a basic call function that operates using power from the switching center so that calls can be maintained at all times. It consists of a main unit and an additional functional unit that is operated using a commercial AC power source inside the house. in this way,
In a two-power supply system configuration with a station power supply system supplied from the exchange and an AC power supply system supplied from a commercial AC power supply, a power outage in either power supply system may cause the circuitry of the other power supply system to be damaged. It is necessary to ensure that no damage is caused to the For example, in the case of a power outage in the AC power supply system, if the output signal from the circuit section of the local power supply system is applied to the circuit section of the AC power supply system, the signal will be applied even though the power supply voltage of that circuit section is zero. As a result, a failure will occur in the circuit section.

The present invention provides a means for separating signals in the event of a power outage between the circuit section of the local power supply system and the circuit section of the AC power supply system in the above-mentioned dual power supply system terminal control device. The purpose is to prevent failures from occurring. Examples will be described in detail below.

FIG. 1 is a block diagram of an embodiment of the present invention, showing the circuit section 1 of the local power supply system and the circuit section 3 of the AC power supply system.
The circuit section 1 includes a transmitter/receiver section, a line termination section, an error control section, a basic signal control section, a basic communication section, etc., and is connected to the power supply from the switching center. It turns and works. Further, the circuit section 3 includes a signal control section, a non-telephone interface section, a display section, etc., operates by being supplied with power from a commercial AC power source, and controls a terminal 5 such as a telephone 4 and a facsimile device.

A plurality of signal lines are provided between the circuit sections 1 and 3, and the signal separation section 2 is composed of a tri-state gate circuit and operates by being supplied with power from both the local power supply system and the AC power supply system. Therefore, it can operate even if one of the power supply systems experiences a power outage. Further, the circuit section 3 is switched so that communication using the telephone 4 can be ensured even in the event of a power outage in the AC power supply system. That is, the basic telephone call function section is operated by the local power supply system, and has a configuration that ensures telephone communication even if the operation of the additional function section is stopped due to a power outage in the AC power supply system. For such a configuration, for example, the configuration of a home device such as a parent-child telephone can be used.

FIG. 2 is a block diagram of an embodiment of the signal separation section. It is constituted by an AND circuit G1, and is controlled by a detection circuit 6 of the station power supply system and a detection circuit 7 of the AC power supply system. The detection circuits 6 and 7 divide the power supply voltage using resistors, and are used as gate circuits such as Schmitt circuits.
Although a configuration is shown in which Ga3 and Gb3 detect whether or not a predetermined voltage is present, other voltage detection circuits may also be used.

If the station power supply system and AC power supply system are normal, the outputs of detection circuits 6 and 7 will be "1", and gate circuit B
The output of 1 is in an open state. Also, gate circuit A1,
The output of A2 is output from the output gate circuit Ga1 of the circuit section 1,
“1” corresponding to “1” and “0” of Ga2 output,
becomes “0”, and the input gate circuit Gb1 of the circuit section 3,
Added to Gb2.

When only the AC power supply system is out of power, the output of the detection circuit 7 becomes "0", the outputs of the gate circuits A1 and A2 become open, and the circuit section 3 becomes disconnected from the circuit section 1. Therefore, even if various signals arrive via the exchange and the outputs of the output gate circuits Ga1 and Ga2 of the circuit section 1 are to be applied to the circuit section 3 via the signal separation section 2, the signal separation section 2 Since the circuit section 3 is in a disconnected state, no signal is applied to the circuit section 3, and no failure occurs in the circuit section 3.

In addition, if only the station power supply system is out of power, the detection circuit 6
Since the output of gate circuit B1 becomes "0" and the output of gate circuit B1 becomes "0", the output gate circuit Ga of circuit section 1 becomes "0".
Regardless of whether the output of gate circuit A1 is "1" or "0", the output of gate circuit A1 is "0". Furthermore, since the output of the AND circuit G1 becomes "0", the output of the gate circuit A2 also becomes "0". Therefore, even if noise etc. are output from the circuit section 1, the input gate circuit Gb1,
"0" is input to Gb2, so that no malfunction will occur.

In the above-mentioned embodiment, the signal separation section 2 may be configured to include gate circuits A1 and B1 corresponding to the signal lines, or may be configured to include an AND circuit G1 and a gate circuit A.
It is also possible to have a configuration consisting of 2. Also, depending on the configuration of the circuit section 3, the output of the signal separation section 2 during a power outage in the local power supply system can be fixed to "1". In that case, the input of the gate circuit B1 may be set to "1", and the AND circuit G1 may be a NAND circuit.

FIG. 3 shows an embodiment of the signal separating section 2 for the signal line from the circuit section 3 to the circuit section 1, which is similar to the configuration shown in FIG. can be shared, and is shown in the same configuration as in FIG. Also, A3, A4, B2 are tri-state gate circuits, G2 is an AND circuit, Ga4, Ga5 are input gate circuits, Gb4, Gb
5 is an output gate circuit. When the AC power supply system experiences a power outage, the outputs of the gate circuits A3 and A4 are fixed at "0", and when the local power supply system experiences a power outage, the outputs of the gate circuits A3 and A4 become open. Therefore, no signal is applied to the power outage circuit section, and the output of the power outage circuit section is fixed at "0". In this embodiment as well, it can be fixed to "1" as in the embodiment shown in FIG.

FIG. 4 is a block diagram of another embodiment of the present invention, in which buses BUS1 and BUS2 are connected and separated between the circuit section 1 of the local power supply system and the circuit section 3 of the AC power supply system. It is. The circuit section 3 has a microprocessor (not shown) and a bus
BUS2 is used to transfer data, etc., and when reading data from circuit section 1, the signal is
The microprocessor controls the signal RW to be "1" and to set the signal RW to "0" when transferring data from the circuit section 3 to the circuit section 1.

The signal separation section 2 connects the buses BUS1 and BUS2 by means of tri-state gate circuits A5 and A6.
It has a configuration for separation, and when the output of the detection circuit 6 is "1" and the signal RW is "1", the output of the AND circuit G3 is "1", the output of the inhibit circuit G4 is "0", and so on. Data from bus BUS1 is transferred to bus BUS2 via gate circuit A5,
At that time, the output of gate circuit A6 is in an open state. Also, when the signal RW is “0”, the AND circuit G
The output of the inhibit circuit G4 is "0", and the output of the inhibit circuit G4 is "1", and the output of the inhibit circuit G4 is "1".
Data from BUS2 is transferred to bus BUS1,
At that time, the output of gate circuit A5 is in an open state.

Furthermore, when the local power supply system experiences a power outage, the output of the detection circuit 6 becomes "0", the outputs of the gate circuits A5 and A6 become open, and the buses BUS1 and BUS2 are separated. Also, when the AC power supply system loses power, the signal RW becomes "0", so the output of the gate circuit A5 becomes open, and no data is sent onto the bus BUS2, so the buses BUS1 and BUS2 are operated in the same way as if they had been separated. Become.

In each of the embodiments described above, since the signal separation section 2 operates with two power supply systems, the local power supply system and the AC power supply system, the detection circuits 6 and 7 can also be provided in the signal separation section 2.

As explained above, the present invention provides the signal separation section 2 between the circuit section 1 of the local power supply system and the circuit section 3 of the AC power supply system, and connects the signal separation section 2 to the tristate gate circuits A1 to A6. , B1, and B2, and controls the circuit section on the power outage side to be in the open state, and the circuit section on the non-power outage side to be in the "0" (low level) or "1" (high level) state. Something,
By separating the signals between the circuit sections 1 and 3, it is possible to prevent failures in the circuit section on the power outage side and to prevent malfunctions in the circuit section on the non-power outage side. In addition, the tri-state gate circuit can be easily integrated into an integrated circuit, and even if the number of signal lines to be separated by the signal separation section 2 is large,
The entire signal separation section 2 can be integrated into an integrated circuit.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG.
3 and 4 are block diagrams of a signal separating section according to an embodiment of the present invention, respectively. 1 is the circuit section of the station power supply system, 2 is the signal separation section, and 3 is the circuit section of the station power supply system.
In the AC power supply system circuit section, A1 to A6, B1, and B2 are tristate gate circuits, and 6 and 7 are detection circuits.

Claims (1)

[Claims] 1. A transmitting/receiving signal separating section is provided between the circuit section of the station power feeding system and the circuit section of the AC power feeding system on the terminal side, and the transmitting/receiving signal separating section is configured with a tri-state gate circuit, and In the event of a power outage on either side of the system, the output of the transmitting/receiving signal separation section is set to an open state to the circuit section of the power supply system on the power outage side, and either low or high level to the circuit section of the power supply system on the non-power outage side. A signal separation control method for a terminal control device, characterized in that the terminal control device is controlled to the following state.