JPH08212879A - Supplying and interrupting device of power source and supplying and interrupting method of power source therefor - Google Patents

Abstract

PURPOSE: To reduce cost by providing a control means for closing one contact later than the other contact at power supply, and opening the one contact earlier than the other contact at power interruption. CONSTITUTION: When an operation switch is pushed, a power source is supplied to a control device 7, the device 7 is worked to supply the power source to a load 4. The device 7 makes a current flow to a coil 8 after one second when the current is made to flow to the coil 9 of a relay, thereby closing a contact 3 after one second when a second contact 6 is closed. The device 7 also stops the current-flowing to the coil 9 after the current-flowing to the coil 8 of the relay is stopped, thereby opening the contact 6 after the contact 3 is opened. Thus, since an inexpensive contact with low durability can be used as the contact 6 though the use of a highly durable contact such that it is never damaged every by large current or spark as the contact 3 is necessary, a supplying and interrupting device 1 for power source can be made inexpensive.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply / interruption device for a power supply supplied to an AC load and a method for supplying / interrupting the power supply.

[0002]

2. Description of the Related Art A conventional power supply / interruption device is provided with an electric wire for supplying electric power, an AC load connected to the electric wire, and an electric wire connected to the load and grounded. In some cases, each electric wire is provided with a contact, and these contacts are simultaneously opened and closed to cut off the power supply or supply the power.

[0003]

[Problems to be Solved by the Invention]
In the breaking device, since the respective contacts are simultaneously opened and closed, the same contacts are usually used. Since these contacts are for supplying or shutting off the power source, sparks due to arc discharge or the like may flow during opening or closing, or a large current inrush current (for example, 3 to 5 times the normal current) may flow. . Therefore, high-performance contacts that can withstand sparks and large currents,
That is, two expensive contacts are used. Therefore, there is a drawback that the price of the power supply / interruption device becomes high.

The present invention provides an inexpensive power supply / interruption device.

[0005]

In order to solve the above-mentioned problems, a first invention is a contact in which a load is connected between an electric wire for supplying a power source and an earthed electric wire, and the electric wires are opened and closed respectively. In the power supply / interruption device provided with a control device for opening and closing these two contacts, the control device includes:
A control means is provided for closing one contact later than the other contact when power is supplied and for opening one contact faster than the other contact when power is shut off.

According to a second aspect of the invention, a load is connected between an electric wire for supplying power and a grounded electric wire, one contact is provided for the electric wire for supplying power, and the other contact is connected to the grounded electric wire. In a power supply / interruption device provided with a control device for opening and closing both of these contacts, the control device includes:
There is provided means for closing the one contact later than the other contact when the power is supplied, and opening the one contact faster than the other contact when the power is shut off.

According to a third aspect of the invention, a load is connected between an electric wire for supplying power and a grounded electric wire, one contact is provided for the electric wire for supplying power, and the other contact is provided for the grounded electric wire. In a power supply / interruption device provided with a control device for moving and opening and closing these contacts, a movable side of the one contact and the other contact is arranged and a single unit for moving the movable side of these contacts. With the opening and closing part of
The contact spacing of the one contact is set smaller than the contact spacing of the other contact.

According to a fourth aspect of the present invention, a load is connected between an electric wire for supplying power and a grounded electric wire, each of these electric wires is provided with a contact for opening and closing, and a power supply / interruption device for opening and closing the contact. In the case of power supply, the other contact is closed, then the one contact is closed, and when the power is shut off, the one contact is opened and then the other contact is opened. is there.

[0009]

In the power supply / interruption device according to the first, second and fourth inventions, one contact is closed later than the other when power is supplied, and when power is cut off. Since one contact opens faster than the other,
A large current or spark at the time of breaking will be applied to only one contact.Therefore, for this one contact, use a durable and expensive contact that will not be damaged by the large current or spark. However, an inexpensive contact with low durability can be used as the other contact.

In the power supply / interruption device according to the third aspect of the present invention, when the opening / closing part is moved by the control device in the direction of closing the contacts during power supply, after the other contact having a small interval is closed, When one of the large contacts is closed, and when the power supply is shut off, the opening / closing section is moved by the control device in the direction of opening the contacts, one contact is opened and the other contact is opened. Therefore, one contact is closed later than the other contact, and one contact is opened faster than the other contact when the power is cut off. Therefore, similar to the first, second and fourth inventions. However, high current and sparks at the time of power supply / interruption will be applied only to one contact, and one contact must be a durable and expensive contact that is not damaged by the large current or spark. However, an inexpensive contact with low durability can be used as the other contact.

[0011]

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a first embodiment, and 1 is a power supply / interruption device. 2 is an electric wire for supplying power (this wire is called a hot line or a power supply line), 3 is a first contact point (one contact point) provided in the middle of this electric wire, and 4 is an alternating current A load to which a voltage is applied (for example, an air conditioner), 5 is a grounded electric wire (this electric wire is called an earth line, etc.), and 6 is a second contact provided in the middle of this electric wire. (Other contact), 7 is a control device, which is supplied with power from an operation switch (not shown) to function and controls the coils 8 and 9 of the relay. The first contact 3 is a contact interlocking with the coil 8 of the relay, and the second contact 6 is a contact interlocking with the coil 9 of the relay. Therefore, the contacts 3 and 6 are opened and closed depending on whether or not the coils 8 and 9 of the relay are energized. Further, the first contact point 3 has a higher durability than the second contact point 6, and is extremely hard to be damaged even when a large rush current flows or sparks caused by arc discharge fly. I'm using one. Therefore, a contact that has high durability and is expensive in price is used as the first contact. Further, as the second contact 6, the one having lower durability and lower cost than the contact 6 is used as the second contact.

When the operation switch is pressed by the user, power is supplied to the control device 7, the control device functions, and power is supplied to the load 4. At the time of this power supply, the controller 7 closes the second contact 6 by closing the first contact 3 after closing the second contact 6 by passing a current through the coil 9 for one second after the current is supplied through the coil 9 of the relay. . In addition, when the power supply is cut off, the operation control device 7 stops the energization of the coil 8 of the relay and then stops the energization of the coil 9, thereby opening the first contact 3 and opening the rear contact 6. .

In the power supply / interruption device 1 configured as described above, when power is supplied, the second contact 6 is first closed, but at this time the first contact 3 is not closed. It is in a state where it has not been conducted yet. Then, after the second contact 6 is closed, the first contact 3 is closed. By closing the first contact 3 with a delay, the device 1 becomes conductive, and at this time, a large current such as an inrush current or a spark due to discharge may fly. However, a contact having sufficient durability so as not to be damaged by this rush current or spark is used as the first contact 3. Therefore, the first contact 3 is prevented as much as possible from being damaged. Moreover, since the second contact 6 is controlled so as not to be affected by the inrush current or the spark, the second contact 6 has a lower durability than the first contact 3.
That is, even if inexpensive contacts are used, they will not be damaged. In addition, since the power is cut off at a plurality of points when the power is cut off, even if one contact, for example, the first contact is short-circuited due to dust having humidity, the second contact 6
Is opened so that the power to the load 4 can be surely cut off.

Therefore, since it is possible to use an inexpensive contact as one of the contacts, it is possible to make the power supply / interruption device less expensive than the conventional one using two expensive and durable contacts. You can

2 to 3 show a second embodiment,
Reference numeral 0 is a first contact point (contact point provided in the middle of the electric wire 2 for supplying power) (one contact point) corresponding to the position shown by reference numeral 3 in FIG. 1, and 21 is provided at a position shown by reference numeral 6 in FIG. Second contact (contact provided in the middle of grounded wire 5)
(The other contact), 20A and 21A are fixing plates for this contact,
20B and 21B are contact fixing plates, and 22 is the fixing plate 20.
A and 20B are fixed open / close parts (movable parts). The open / close parts move downward (closed direction) in the drawing or move upward (open direction) in the drawing, so that the contacts 20 and 21 are closed. Close and open. 23 is the fixed plate 20A, 21
A fixed part to which A is fixed, and this fixed part is fixed so as not to move. Reference numeral 24 is a coil for moving the opening / closing section 22. Distance X, Y between the first contacts 20
The relationship is set such that the distance X between the first contacts 20 is larger than the distance Y between the second contacts 21 (X> Y). Contact 2
Since the interval 0, 21 is set in this way, the opening / closing part 22 is moved by the coil 24, so that when the power is supplied, the second contact 21 is closed and then the first contact 20 is closed.
Closes after about 1 second, and when the power is cut off, the first contact 2
After 0 opens first, the 21st contact will open later.

Further, as in the first embodiment, the contact 20 is more durable than the contact 21, so that it is less likely to be damaged even if a large rush current flows or a spark blows. It uses a high-performance one. Therefore, the contact 20
As for the price, it uses expensive contacts. Further, the contact 21 has a lower durability than the contact 20, so that the price of the contact 21 is low.

In the power supply / interruption device configured as described above, the operation switch is pressed and the control device functions. When the control device functions and supplies power to the AC load, the opening / closing part 22 is moved in the closing direction by energizing the coil 24. When the opening / closing part 22 is moved downward as shown in FIG. 2, the second contact 21 is first closed. Then, after the second contact 21 is closed, the first contact 20 is closed. The state where both contacts are closed is shown in FIG.

When the power supply to the load is cut off by pressing the operation switch again, the coil 24 of the control unit is cut off from the electric current to move the movable portion 22 in the opening direction shown in FIG. When the opening / closing part 22 moves toward the upper side of the drawing, the first contact 20 first opens, and then the second contact 21 opens after the first contact 20 opens. In this way, the order of opening and closing the contacts is the same as in the first embodiment,
The way of opening and closing is different from the first embodiment in that a relay is used, whereas the second embodiment uses a mechanically movable opening and closing portion.

This second embodiment is also similar to the first embodiment.
The cost of the power supply / interruption device for the electric circuit can be made lower than that of the conventional one using two expensive and highly durable contacts.

In this embodiment, the contact is a relay contact or a contact that is mechanically moved to open and close, but a contactless type semiconductor switching element is used as the contact. It doesn't matter. In addition, even if the structure has two contacts and one relay coil,
Any combination of large and small contacts that causes a difference in operating time (opening / closing time) can be used. Further, in this embodiment, the contact provided on the electric wire for supplying power is described as one contact, but the contact provided on the grounded electric wire is used as one contact, and the contact provided on the electric wire for supplying power is also described. Is the other contact, and one of the contacts closes later than the other when supplying power,
When the power is cut off, it may be controlled to open earlier.

[0021]

According to the first to fourth aspects of the invention, as one of the contacts, a highly durable contact that is not damaged by a large current or a spark must be used, but as the other contact. Since inexpensive contacts having low durability can be used, a power supply / interruption device can be provided at low cost.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram of a power supply / interruption device showing a first embodiment of the present invention.

FIG. 2 is a main part explanatory view of a power supply / interruption device showing a second embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a state in which the contacts of the power supply / interruption device are closed.

[Explanation of symbols]

 1 power supply / interruption device 2 electric wire (electric wire for supplying power) 3 first contact (one contact) 4 load 5 electric wire (grounded electric wire) 6 second contact (other contact) 20 first contact (one contact) Contact) 21 2nd contact (other contact)

Claims (4)

[Claims] 1. A power supply comprising a load connected between an electric wire for supplying power and a grounded electric wire, a contact for opening and closing each of these electric wires, and a control device for opening and closing both of these contacts. In the circuit breaker, the control device is provided with a control means that closes one contact later than the other contact when power is supplied and opens one contact faster than the other contact when power is cut off. Power supply / interruption device characterized by 2. A load is connected between an electric wire for supplying power and a grounded electric wire, and one contact is provided for the electric wire for supplying power and the other contact is provided for the grounded electric wire. In a power supply / interruption device equipped with a control device for opening and closing the contacts, the control device is configured so that the one contact is closed later than the other contact when power is supplied, and when the power is interrupted. A power supply / interruption device comprising means for opening the one contact faster than the other contact. 3. A load is connected between an electric wire for supplying power and a grounded electric wire, and one contact is provided for the electric wire for supplying power and the other contact is provided for the grounded electric wire. In a power supply / interruption device having a control device for moving and opening and closing, a movable side of the one contact and the other contact is arranged and a single opening and closing part for moving the movable side of these contacts is provided. A power supply / interruption device, characterized in that the contact spacing of the one contact is set smaller than the contact spacing of the other contact. 4. A power supply / interruption device for connecting a load between an electric wire for supplying power and a grounded electric wire, providing a contact for opening / closing each of these electric wires, and supplying / interrupting a power supply in a power supply / interruption device. In the case of, the other contact is closed, then the one contact is closed, and when the power is shut off, the one contact is opened and then the other contact is opened. How to shut off.