JPH09288948A - Relay controlling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize latch relay control in low voltage, by making constitution, wherein the set coils of a two-coil latch relay can be connected in parallel to be driven as a one-coil latch relay. SOLUTION: A two-coil latch coil relay 1 is composed of a set coil 1a, a reset coil 1b, and a contact 1c. By this constitution, the set and reset coils 1a and 1b are connected in parallel, and polarity can be changed between terminals 2a and 2b, by relay control part 2, to add voltage for a fixed time, to make the set and reset action of the contact 1. For example, when the number of winding, rated driving voltage, and current of the respective coils of the coils 1a and 1b are Y, V, and I respectively, the acting force of a relay results in (n)×I×T; and when the rated voltage is made 0.5V, the current results in 0.5I, thereby making the relay driving force into 1/2. When the coils 1a and 1b are connected in parallel, the current, flowing in the coils, results in I, a device can be driven by the same current although the voltage is 1/2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a relay control device operated by a low voltage power supply.

[0002]

2. Description of the Related Art A conventional latching relay is controlled by a two-winding latching relay equipped with a set coil and a reset coil and one coil, which is not shown.
There is a winding latching relay. The two-winding latching relay controls by applying a pulse voltage to the set coil or the reset coil every time the relay operation is turned on / off. Similarly, the one-winding latching relay inverts the polarity of the voltage applied to the coil every time the relay operation is turned on / off to perform control.

FIG. 4 shows an example in which the two-winding latching relay is used in a terminal network control device. A terminal network control device 6 is connected to the telephone line 10 and its input is the telephone line 10.
It is also connected to the communication processing unit 8 that controls the connection with. The input of the telephone line 10 is connected to the telephone 11 via the relay contact 1c of the two-winding latching relay 1. The control unit 7 controls the communication processing unit 8 and controls the setting coil 1a and the reset coil 1b of the two-winding latching relay 1. In the above configuration, the telephone 11 is connected to the telephone line 11
When detached from the coil, the setting coil 1a is energized for a predetermined time, and when it is returned to the original state, the reset coil 1b is energized for a predetermined time. The two-winding latching relay 1 is for disconnecting the telephone 11 from the telephone line 11 when a call communication request is issued from the terminal network controller 6.

[0004]

However, in the above conventional method, the driving voltage of the latching relay is 3 to 50V.
If it is high, there is not much problem, but if the drive voltage has to be reduced to 2 V or less, there is a drawback that there are few types of relays and current consumption is large.

Further, when the relay is operated by the battery power source, unless the current load on the battery is reduced, the battery voltage is lowered and the circuit does not operate.

Further, when the relay is operated by using the power supply of the telephone line, the relay must be operable at a low voltage and the current load on the telephone line must be reduced to maintain the line impedance at the rated value. There is a problem.

SUMMARY OF THE INVENTION The present invention solves such a conventional problem, and an object thereof is to provide a relay control device which operates without using a special latching relay even at a low power supply voltage.

[0008]

SUMMARY OF THE INVENTION To solve the above problems, the present invention provides a set coil for a two-winding latching relay,
The reset coils are connected in parallel and configured to drive as a one-winding latching relay. With the above configuration, it is possible to enable latching relay control at a low voltage.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention provides a two-winding latching relay by simultaneously energizing a set coil and a reset coil of a two-winding latching relay and providing a control section for performing a set / reset in consideration of a current direction. The relay can be used as a low voltage one-winding latching relay.

Further, since the battery power source for driving the relay, the capacitor for charging the relay operation power source and the charging resistor are provided, the relay can be operated by the low voltage battery power source.

Further, by providing the diode bridge connected to the telephone line and the control section for controlling the relay by the power source from the diode bridge, the relay can be operated by the power source of the telephone line.

(Embodiment 1) In FIG. 1, reference numeral 1 denotes a two-winding latching relay, which comprises a set coil 1a, a reset coil 1b, and a contact 1c. Reference numeral 2 is a relay control unit for supplying a current to the setting coil coil 1a and the reset coil 1b. With the above configuration, the set coil 1a and the reset coil 1b are connected in parallel and the relay control unit 2
Thus, the polarity is changed between the terminals 2a and 2b and a voltage is applied for a certain period of time to set and reset the contact 1c. For example, when the resistance value of the set coil 1a and the reset coil 1b is RΩ, the number of turns of the set coil and the reset coil is T, the rated drive voltage is V, and the current flowing in each coil is I, the operation of the relay is performed. The force is n × I × T (n is a constant). Further, assuming that the rated voltage is 1/2, which is 0.5 V, the resistance value per coil is R, the number of turns of the coil is T, and the current is 0.5 I. Therefore, the relay driving force becomes 1/2 as compared with the case where the voltage V is applied. However, when the set coil 1a and the reset coil 1b are connected in parallel, the sum of the currents flowing through both coils becomes I,
The relay driving force is also 2 × (n × 0.5I × T) and can be driven with the same current even if the voltage is ½.

(Embodiment 2) In FIG. 2, a battery power source 5 is connected to the control unit 2. A charging resistor 3 and a capacitor 4 are connected to the battery power source 5. In this configuration, the setting coil 1a and the reset coil 1b of the two-winding latching relay 1 operate so as to be driven by using the terminal 2b of the relay control unit 2 as a power source. In addition, the terminal 2 of the relay control unit 2
5a is a battery power source for operating the relay control unit 2
Is connected. Therefore, when the latching relay 1 is driven,
Since a driving current flows from the capacitor 4 to the setting coil 1a and the reset coil 1b, the load on the battery power source 5 is reduced.

(Embodiment 3) In FIG. 3, the terminal network control device 6 has a diode bridge 9 connected to a telephone line 10, matching of DC resistance and AC impedance with the telephone line 10, transmission and reception of signals, etc. A communication processing unit 8 that operates as an interface of the present invention and has a modem processing function and a DTMF processing function, a relay contact 1c of a two-winding latching relay 1 that controls the connection between the telephone line 10 and the telephone 11, and controls the above-mentioned respective units. Although not shown in the figure, the controller 7 is provided with a microcomputer. In the above structure, the output of the diode bridge 9 is connected to the control unit 7, and the setting coil 1a and the reset coil 1b of the two-winding latching relay 1 operate so as to be driven by this power supply. The output voltage from the diode bridge 9 may be 3 V or less when the telephone line is closed.

[0015]

As described above, according to the present invention, it is possible to use the two-winding latching relay as a low-voltage one-winding latching relay, it is not necessary to increase the number of relay types, and the existing two-winding relay is used. The wire latching relay can be operated at a voltage of 1/2, increasing the versatility of the relay.

Further, the latching relay can be operated by the low voltage battery power source, and the terminal network control device which operates at the low voltage can be realized.

Further, the relay can be operated by the low voltage of the telephone line, the load of the battery power source due to the drive current of the relay can be reduced, and the cost of the terminal network control device can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of a main part of a relay control device according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a main part of a relay control device according to a second embodiment of the present invention.

FIG. 3 is a block diagram of a main part of a terminal network control device using a relay control device according to a third embodiment of the present invention.

FIG. 4 is a block diagram of a main part of a terminal network control device using a conventional relay control device.

[Explanation of symbols]

 1 2 winding latching relay 2 relay control unit 3 charging resistance 4 capacitor 5 battery power supply 6 terminal network control device 7 control unit 8 communication processing unit 9 diode bridge

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shiro Honma 1006 Kazuma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A two-winding latching relay provided with coils for setting and resetting, and a control unit for causing a current to flow through the two coils at the same time and changing the direction of the current to perform a set / reset operation. Relay control device. 2. The relay control device according to claim 1, further comprising a battery power source, a charging resistor, and a charging capacitor, wherein the charging capacitor supplies power to the coil of the relay. 3. A terminal network control device comprising at least a diode bridge connected to a telephone line, and a communication processing unit for performing line connection control and communication control with the telephone line.
The relay control device according to claim 1, wherein the output of the diode bridge operates as a drive power source for the relay.