JPS6070859A - Latch relay set/reset circuit for terminal device - Google Patents

Abstract

PURPOSE:To attain surely set/reset of a latch relay even with less supply power by charging only the charging circuit for a set circuit at start, and charging the charging circuit for a reset circuit after a prescribed time. CONSTITUTION:When a terminal start voltage is applied from a terminal controller to a power supply terminal 1, the power is started to be stored to the 1st charging circuit 11 to produce the power to the set circuit 5. The 2nd charging circuit 14 is not connected by a switch circuit 13 in this case. On the other hand, a timer circuit 12 is operated at the same time when the voltage is applied, and turns on the switch circuit 13 at the prescribed time. Then the power is started to be stored in the 2nd charging circuit and used as the power for the reset circuit 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a terminal device that is connected in parallel to a telephone set and operates by central power supply, and more specifically, a latch relay that disconnects the line of the telephone set and connects the line when the terminal unit is activated and terminated. Regarding the set/reset circuit.

In general, in a data terminal device that is connected in parallel with a telephone and can make automatic calls, the terminal startup power of several milliwatts or less supplied from the terminal control device connected after the terminal device is used to maintain the idle state of the line. is detected, the line is closed, the latte relay is activated, the phone is disconnected, and the connection is made (after i ends,
The line of the terminal device is opened, and after a certain period of time, the latch relay is operated to recover, and the telephone is connected to the line.

In this case, if the power supplied to the terminal device is sufficient,
There was no problem with the power required to operate the latch relay, but if restrictions were placed on the power consumption of the terminal equipment, in order to operate the latch relay, a charge must be added to the capacitor in advance, as shown in Figure 1. You have to find a way to save it. In FIG. 1, 1 is a terminal activation power supply terminal from a terminal control device (not shown), 2 is a ground terminal, 5 is a set circuit having a set activation terminal 3, 6 is a reset circuit having a reset activation terminal 4, and 7 is a capacitor, 8 is a latch relay set coil, 9 is a latch relay reset coil, and 10 is a diode. Here, the set circuit 5 and the reset circuit 6 are used to disconnect and connect lines as described above, but the reset circuit 6
is operated after a certain period of time after the power from the power supply terminal 1 is turned off, so the capacitor 7 must have a large capacity to hold the power.However, by connecting the large capacity capacitor 7, the power supply When the power supply from the terminal 1 is turned on, a drawback arises in that the voltage at the center circuit 50 is not sufficiently high by the time the set circuit 5 starts operating.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and to provide a circuit that operates reliably in both setting and resetting.

In this investigation, we divided the power supply into one for the set circuit and one for the reset circuit, connected a photoelectric means to each 141t, and determined that the reset circuit's output voltage was 9 hours after the rise of the set circuit's Eigen pressure. (so as not to affect the situation).

The present invention will be explained in detail below using an example circuit shown in the drawings.

FIG. 2 shows a block diagram of a set/reset circuit according to the present invention, and the same components as in FIG. 1 are designated by the same numbers. In FIG. 2, numeral 11 is a first charging circuit for accumulating charges for setting, numeral 12 is a timer circuit, numeral 16 is a switch circuit, and numeral 14 is a photoelectric circuit 2 for accumulating charges for resetting.

The operation will be explained below.

When the terminal starting voltage from the terminal control device is applied to the - source terminal 1, power begins to be accumulated in the first charging circuit 11, and the first charging circuit 11 becomes a power source having one voltage necessary for operating the set circuit 5. . At this time, the second charging circuit 14 is disconnected by the switch circuit 16, so the first charging circuit 11
The rise time is fast. On the other hand, simultaneously with the application of the voltage, the timer circuit 12 operates, and when it detects a predetermined time, it turns on the switch circuit 13. Then, power begins to be accumulated in the second charging circuit 14, and the -
Become the source.

When a predetermined amount of power is accumulated in the 20th charging circuit, the 1st
Since sufficient charge has already been stored in the photoelectric circuit 11, when the cent start signal is input to the terminal 6 after a certain period of time after the power supply at the power supply terminal 1 is turned on, the latch relay is surely sected. After that, the power of power terminal 1 is turned off.
At the time of "F", sufficient charge has been accumulated in the second charging circuit 14 and the power supply voltage of the reset circuit 6 is maintained, so the reset activation signal is output from the terminal 4 after a certain period of time after the power is "OFF". It will definitely be reset when input.

The present invention makes it possible to reliably set and reset the launch relay even if the supplied power is low, so it is extremely convenient in practical use.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a conventional latch relevant reset circuit, and FIG. 2 is a block diagram of a latch relevant reset circuit for a floor device by Akira Motoori. 1: Terminal startup power supply terminal 5: Set circuit 6: Reset 7 times 11: First charging circuit 12: Timer circuit 15: Switch circuit 14: Second charging circuit Akio Takahashi, patent attorney ←Song□Sai” - Koichi

Claims (1)

[Scope of Claims] 1. A terminal device that is connected in parallel to a telephone and includes a latch relay, a set circuit that sets the latch relay, and a reset circuit that resets the latch relay, which receives power from a terminal startup power supply terminal. a first charging circuit that provides charging power as a power source for the set circuit; and a first charging circuit that receives power from the terminal startup power supply terminal and resets the charging power after a predetermined time from the start of charging of the first charging circuit. A latch relay set/reset circuit for a terminal device, characterized in that a second charging circuit is provided to serve as a power source for the circuit. 2. The second charging circuit includes a timer circuit that measures a predetermined time from the start of charging of the first charging circuit, and a timer circuit that is connected between the original terminal for starting the terminal and the second charging circuit. The latch relay set/reset for a terminal device according to claim 1, wherein the charging start time is controlled by a switch circuit whose switch is opened and closed by the output of the timer circuit. circuit.