JPS6313212A - Switch controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is configured by a logic circuit and determines the closing and opening conditions of a switch to be controlled, and uses the result as a closing command to control the switch. This relates to a switch control device that outputs output to a switch.

[Conventional technology]

Figure 2 shows, for example, Electric Kyodo Research No. 41i No. 4 (P.

29, Fig. 3-2-2) shows the conventional switch control device shown in Fig. 3-2-2). In Figure 2, (1) is the switch control device, (2) is the switch, and (3) is the control power supply (positive electrode).
, (4) is the control power supply (negative pole), αφ is the logic circuit, (2)
is closing relay 1, (21) is the normally closed contact of closing relay 1, (40) is closing relay 2, (42) is closing relay 2
(50) is a normally closed contact, and (50) is a power supply for the logic circuit.

Next, the operation will be explained.

The logic circuit Qφ inputs the state of the switch (2) to be controlled, the state of the power system to which the switch (2) is applied, etc., and determines whether the switch (2) should be closed or opened. Determine whether it is in the desired state. As a result, when the switch (2) is to be closed, the logic circuit OI energizes the first closing relay (2), and when the switch (2) is to be opened, the logic circuit OI is energized by the first closing relay (2). Do not energize the closing relay +2m. Second
The closing relay (40) has one terminal of its coil connected to the first
is connected to the control power supply (positive pole) (3) via the normally open contact (21) of the closing relay Q-, and the other terminal of the coil is connected to the control power supply (negative pole) (4). It operates and returns in response to the operation and return of the first closing relay 12Φ. The normally open contact (42) of the second closing relay is connected to the switch (2).
) is connected to the switch (2) as a closing signal for the contact (4).
Depending on whether the state of 2) is closed or circuited, the open/close path (2) maintains a closed state or an open state, respectively. The logic circuit power supply (50) inputs the control power supply (positive pole) (3) and the control power supply (negative pole) (4), and by supplying power to the logic circuit θ [0 or more, the switch (2) Opener control bag! Closing or opening control is performed based on the judgment result of the logic circuit α1 in +11.

[Problem that the invention seeks to solve]

Since the conventional switch control device is configured as described above, when the switch (2) needs to continue closing, the logic circuit α[, the first closing relay (2m and the second It can be said that all the closing relays (40) of the switch must continue to have a closing signal or operating state, and the logic circuit power supply (50) must also continue to operate normally. (2) The reliability of the control to maintain the closed state of the logic circuit 001, the first closing relay (a), the second closing relay (40), and the logic circuit power a (50) is If there is a problem with any one of these elements, the switch (2) will not be able to maintain the closed state, resulting in a power outage in the applicable power system, which is a problem in terms of reliability. Ta.

This invention was made to solve the above-mentioned problems, and when a malfunction occurs in either the logic circuit, the closing relay 1, or the logic circuit power supply when the switch should remain closed. However, it is an object of the present invention to provide a switch control device that can maintain the switch closed without changing the switch from closed to open even when the closing command disappears.

[Means for solving problems]

The switch control device according to the present invention adds a self-holding circuit to the coil of the second closing relay that gives a closing command to the switch, and in the event that the switch should be kept closed, the logic circuit, the first If either the closing relay or the logic circuit power supply is unable to maintain the closed state due to some condition,
The second closing relay maintains self-holding with a self-holding circuit i[
1. A closing signal is continuously given to the switch.

[Effect]

The switch control device according to the present invention adds a self-holding circuit to the closing relay that gives the opening command to the switch, so that even if the signal that energizes the closing relay disappears by mistake during the closing command, the switch can be opened or closed. The close command to the device continues.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, +11 is the switch control device, (2) is the switch, (3) is the control power supply (positive pole), +41 is the control power supply (negative pole), Ol is the logic circuit, e is the first closing relay, (2
1) is the normally open contact of the first closing relay, (30) is the open relay, (31) is the normally closed contact of the open relay, (40) is the second closing relay, and (41) is the normally closed contact of the second closing relay. Normally open contact 1, (42) of the closing relay is normally open contact 2, (42) of the second closing relay.
50) is a logic circuit power supply.

Next, the operation of the present invention will be explained.

The logic circuit OI inputs the state of the switch (2) to be controlled, the state of the power system to which the switch (2) is applied, etc., and determines whether the switch (2) should be closed or opened. Determine whether it is in the desired state. As a result, when the switch (2) is in a state where it should be closed, the first closing relay 121 is continuously energized and the opening relay (30) is not energized during the period in which this state continues for m. The second closing relay (4o) is controlled by one terminal of its coil via a series circuit of the normally closed contact (31) of the open relay (30) and the normally open contact (21) of the closing relay (2m). Since it is connected to the quantity 1!J (positive pole) (3) and the other terminal of the coil is connected to the controlled quantity a<negative pole) (4), the first closing relay (to) operates and opens. In this state to be closed, in which the relay (30) has returned, the second closing relay (40) is energized.

Since the normally open contact (42) of the second closing relay is connected to the switch (2), at this time, the opening command is issued to the switch (
2) is output. Further, the other normally open contact (41) of the second closing relay is connected in parallel with the normally open contact (21) of the first closing relay, so that the second closing relay (40) is self-maintaining. In order to form a circuit, the normally open contact of the first closing relay (21
) opens, this second closing relay (40) continues to hold itself.

Therefore, the opening command to the switch (2) never disappears.

Next, when the judgment result of logic circuit 0 is that the switch (2) should be opened, the opening relay (30) is continuously energized for the duration of that state, and the first closing relay a is activated. The normally closed contact (31) of the open relay, which is connected in series with the coil of the second closing relay (40), is opened, so in this state where it should be opened, the second closing relay (40) is not energized. 40) is not energized. The normally open contact (42) of the second closing relay is connected to the switch (2), but at this time, the normally open contact (42) of the second closing relay is open. A closing command is not given to the switch (2), and the switch (2) remains open.

In addition, in the above example, the effect of the self-holding circuit of the closing relay in the event that a failure occurs in the logic circuit that controls the closing relay while the closing relay is outputting the opening command is shown. The self-holding circuit of the closing relay is effective even when the logic circuit power supply stops functioning due to a drop in power supply, and therefore the logic circuit cannot normally give an opening command to the closing relay.

Furthermore, although the above embodiment has been described with respect to the case of controlling a switch, the same effects as those of the above embodiment can be obtained when controlling a device or appliance other than the switch.

〔Effect of the invention〕

As described above, according to the present invention, a circuit for self-holding while the closing command is being output is added to the coil of the closing relay that gives the opening command to the switch, so that the closing condition can be determined and the result can be used to determine the closing condition. Even if something goes wrong with the logic circuit that energizes or deactivates the closing relay, and the energizing signal cannot be given to the closing relay, the closing relay will continue to maintain its self-holding status and will not close the switch. This has the effect of providing a highly reliable switch control device that can continue the signal.

[Brief explanation of drawings]

FIG. 1 is a connection diagram showing an embodiment of the present invention, and FIG. 2 is a connection diagram showing a conventional switch control device. In the figure, (1) is the switch control device, (2) is the switch, (3) is the control device (positive electrode), and +41 is the control device. ! ff device (negative pole), QrA is the logic circuit, (A) is the first closing relay, (21) is the normally open contact of the first closing relay, (30
) is an open relay, (31) is a normally closed contact of an open relay, (
40) is the second closing relay, (41) is the normally open contact 1 of the second closing relay, (42) is the normally open contact 2 of the second closing relay, (50) is the logic circuit power supply It is. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Figure 1 Figure 2 (l

Claims (1)

[Claims] A logic circuit that determines whether the switch to be controlled should be closed or opened, and a logic circuit that determines whether the switch to be controlled should be closed or opened, respectively. a first closing relay and an opening relay to be energized; one pole is a normally open contact of the first closing relay connected to a control power source (positive pole); one pole is a normally open contact of the first closing relay; A normally closed contact of the open relay is connected to the other pole of the normally open contact of the open relay, one terminal is connected to the other pole of the normally closed contact of the open relay, and the other terminal is connected to the control power source (negative pole). a second closing relay that is connected in parallel with a normally open contact of the first closing relay; a first normally open contact of the second closing relay that is connected in parallel with a normally open contact of the first closing relay; A switch configured of a second normally open contact of the second closing relay that gives a command, a control power source (positive electrode), and a logic circuit power source that inputs a control power source (negative electrode) and generates a power source for the logic circuit. Control device.