JPS62219414A - Switch - 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] [Tumor field of use] This invention is a switch that can switch on and off current.

[Conventional technology]

FIG. 3 is a semi-spherical sectional view showing an example of a conventional switch disclosed in Japanese Patent Application Laid-Open No. 59-117713. Note that since the conventional switch is bilaterally symmetrical, FIG. 9 shows one side of the IT surface. (11 is a mounting base made of plastic, (2) is a fixed core laminated with silicon steel plates on the mounting base (1), +3) is a fixed core (installed opposite to 21, and similarly laminated with silicon fI148!) movable iron core.

(41 is a movable iron core + 3) and 1 constant iron core (2: is an operation coil that provides a driving force to crush and crush against a tripping spring (not shown), (5: is made of plastic and has a square window. The lower end of the crossbar holds the movable iron core (3). (61 is a root-shaped crossbar inserted into the corner window of the crossbar (5) and held by the pusher (7) K. The movable contactor C61) is the movable contact provided with this movable contactor 161K, (the fixed contactor provided opposite the movable contactor 1 (%l) and carrying current through 11'1, ( 8A
) is a fixed contact provided on fixed contact +81, (a
C) is the same (11 constant contact (8: shows the terminal part). Therefore, (91 is the terminal screw for connecting the opening/closing body to the external circuit, tte is the base that connects the fixed contact + g +, [111 is a cover that appears above the electromagnetic contactor.A pair of fixed contacts (8) are connected in parallel with nine bidirectional three-terminal thyristors, or triacs (not shown).The situation is shown in Fig. 4. For example, BPP5383
This is what was shown in . In the fourth flight, <141 is a resistor for setting the ignition value of triac a3 to an appropriate value, a is a battery that is a DC power source for supplying the ignition current to triac 0, and ae is a This is an open/close switch that operates in conjunction with a crossbar (not shown). This open/close switch has a possible JIEI+ contact, and (6A) is a fixed contact (
8A), and operates in conjunction with the crossbar so that the movable contacts (6 contacts) open after being separated by the fixed contacts (8A).

α is an ignition circuit in which a resistor U, a battery (15), and an open/close switch (Iυ) are connected in series.One terminal (13A) of the triac 13 and a gate
connected with.

A conventional switch is constructed as described above. For example, when the operating coil (41) is energized, the movable ψζ core (3) moves from the fixed iron core (
21K @ pulled, fixed contact (8A) and movable contact (6A
), but the open/close switch αe is closed before the movable contact (6A) contacts the fixed contact (8A).

Then, the gate GK ignition current of the triac a3 flows, the triac constant 3 turns on, and a contact current first flows between both terminals of the triac a3.

Next, the movable contact (6A) makes static contact with contact (k) and K, and a contact current is commutated between the fixed contacts (8A) and (8A). This is because the resistance between the terminals of TRIAC 3 is on the order of 10, whereas the resistance between the movable contact (6A) and fixed contact (8A) is on the order of 10.
This is caused by the contact resistance being on the order of μΩ. Here, when the movable contact (6A) breaks apart and separates from the fixed contact (8A), an arc occurs, but the resistance of this arc is significantly higher than the resistance between the terminals of Try Book A3, so the movable contact (6A) The contact 'DC current flowing between the fixed contact (8A) and the fixed contact (8A) is commutated to the triac a3,
7 The arc between the constant contact (8A) and the movable contact (6A) is extinguished.

When the movable contact (6A) contacts the fixed contact (8A) again.

Triac (IsK) The contact current flowing through the contact
.

(8A) 911i K I/r, #L. Since the bounce phenomenon normally occurs multiple times during the closing operation of the movable contact (6A), the above operation is repeated several times, and after the bounce phenomenon ends, even if the triac O is turned on, the above operation is repeated several times. Try Book A3 states that only a small amount of current flows through contact 1 (9t3), and all contact current flows through contact (6A) and (8A).
) flows to Ml.

Next, the case of disconnecting and connecting the switch will be explained.

When the current flowing through the coil (41) is cut off, the movable core +3 is pulled away from the constant core (21) by a spring (9) not shown, and the movable contact (6A) is separated from the fixed contact (8A).

When the movable contact (6A) separates from the fixed contact (8A), an arc is generated between the movable contact (6A) and the fixed contact (8A), but at this time, the open/close switch is not open yet. Well, 'triac Q3 is in a conductive state, so it's possible lol! The contact current flowing between the dormitory point (6A) and the fixed mA (8A) is commutated to the triac a3, and the movable contact (6A)
) and the constant contact (8A) is extinguished. Then, in the process of moving the movable contact (6A) away from the fixed contact (8A), the on/off switch is opened, and the triac a3? -) Since the ignition current will no longer flow through G.

When the contact current reaches the zero point, the B operation of the contact current is completed.

In this way, the arc generated during the closing operation and the breaking operation of the switch can be suppressed, so that the contact wear of the movable contact (6A) and the fixed contact (8A) is significantly reduced.

Note that the triac in FIG. 4 operates in the same way as in the case of FIG. 4 even if it is two reverse-blocking three-terminal thyristors connected in antiparallel as shown in FIG. 5. [Problem] Since the conventional switch is constructed as described above, there is a problem that the gate for igniting the reverse blocking three-terminal thyristor or triac requires the power supply α9 of the current phase. Ta.

This invention was made to solve the above-mentioned problems, and has a simple configuration that reduces contact wear when turning on and cutting off the current without using a special power supply for energizing. The purpose is to obtain a switch that can be used.

[Failure to solve the problem]

The switch according to this invention has ti! ! at least one fixed contact to which an I constant contact is joined; a movable contact to which a movable contact that connects and separates is joined to the fixed contact; a contact that is electrically connected when the movable contact and the fixed contact are in contact A bidirectional three-terminal thyristor, and a series connection body of a resistor and an on/off switch connected Km between the gate and non-gate side terminal of the bidirectional three-terminal thyristor. The switch according to the invention includes at least one fixed contact to which fixed contacts are joined.

A movable contact in which a movable contact that connects and separates from the fixed contact is joined, two reverse wind upward three-terminal thyristors connected in antiparallel between the contactors that conduct when the one-return contact and the fixed contact come into contact, and The thyristor includes a series connection body of a resistor and an on/off switch connected between the gate and non-gate side terminal of each thyristor.

[Effect]

In this invention, since the voltage applied between both terminals of the triac can be used as a power source for ignition of the triac, a new power source is not required. The voltage applied between both terminals of a three-terminal thyristor can be used as a power source for ignition of the thyristor.

There is no need for a new N.

〔Example〕

Hereinafter, a practical example of the present invention will be explained with reference to FIG. 1 showing the main part thereof.

Since the switch according to one embodiment of the present invention is almost the same as the conventional switch described above, the differences will be described below. In Fig. 1, +141 is a resistor for setting the ignition current of triac A3 to an appropriate 1hK.

tte is an opening/closing switch that operates slowly on a crossbar (not shown). This open/close switch (2) has a movable contact (
It operates in conjunction with the crossbar so that the movable contact (6A) closes before it comes into contact with the fixed contact (aA) Km, and opens after the movable contact (6A) moves away from the fixed contact (8A). +171 is a series connection of a resistor I and an on/off switch ue, that is, an ignition circuit.

One terminal (13A) of the triac (13) and the gate G are connected by an ignition circuit (171).

In the switch configured as described above, the closing operation of the switch will first be described.

The open/close switch aS is closed before the movable contact (6A) contacts the fixed contact (8A). Then, the ignition current flows to G of the triac αJ via the resistor I,
Trybook a3 is on and triac Q3
Contact current first flows between both terminals of 2 and then the movable contact (6
A) contacts the fixed contact (8A) and the fixed contact (aA),
The contact current is commutated between (8A). This is because the resistance between the terminals of triac a3 is on the order of mΩ,
The contact resistance between the movable contact (6A) and fixed contact (8A) is μΩ
This is caused by the order of . here,
When the movable contact (6A) bounces and separates from the fixed contact (8A), an arc is generated - the resistance of this arc is clearly higher than the resistance between the terminals of the triac U3, so the movable contact (6A) and - The contact current flowing between the point (8A) and the point (8A) is commutated to the triac 3, and the arc between the fixed contact (8A) and the movable contact (6A) is extinguished.

When the movable contact (6A) contacts the fixed contact (8A) again.

The contact current flowing through triac 0 is contact (6A).

The current is commutated to the (8A) side. During closing operation of movable contacts (6 people).

Since the bounce phenomenon usually occurs multiple times, the above process is repeated multiple times, and after the bounce phenomenon ends, even if the triac LI3) is fired, the triac a3
&C, only a small amount of contact current flows, and almost all of the contact current flows to the - side of contacts (6A) and (8A).

Next, the case of one switch breaking operation will be explained.

Possible! #Contact (6A) is a fixed contact! (8A), an arc is generated between the movable contact (6A) and the fixed contact (8A), but at this time, the open/close switch (Ie is not opened yet, and the Since the gate lightning flows, the triac (I3) is in a conductive state, so the contact current flowing between the movable contact (6A) and the fixed contact (8A) is commutated to the triac Q3, and the contact current flowing between the movable contact (6A) and the fixed contact The arc between (8A) disappears.And.

In the process of moving the movable contact (6A) away from the constant contact (8A), the on/off switch uIi is opened, and the ignition current no longer flows through the triac 0 gate (G), so when the contact current reaches zero, The interruption of the ground current is completed. Konoyo 5
In addition, since the arc that occurs during the closing operation and the occasional disconnection operation of the switch can be suppressed, contact wear of the WJ moving contact (6A) and (6) constant contact (8A) is significantly reduced. Since the gate current of the triac (13) is supplied via the resistor I by the voltage applied to the triac 0, there is no need to provide a special power supply for supplying the gate current.

FIG. 2 is an electrical circuit diagram showing the main parts of another embodiment of the invention. In this embodiment, two reverse blocking three-terminal thyristors (13B) are used instead of one triac 0. The two thyristors (13B) are connected in parallel so that their polarities are opposite to each other, and a pair of fixed contacts 181 are connected.
．． It is connected between 181 and 181.

One anode side terminal, that is, a non-gate side terminal of each of the two thyristors (1511) and each gate (G) are connected to the above-described embodiment at a point LA (b) path α9 similar to IWJ. The effect of this embodiment is that the two thyristors (13B) are connected to the triac Q3 of the previous embodiment.
Since it only replaces , the explanation of the 9 action will be omitted. However, when * or the current is direct current, it is sufficient to use a gate turn-off thyristor instead of the thyristor (13B) for the trap and to open and close one of the open/close switches (161).

In addition, the open/close switch ae closes before the movable contact (6A) contacts the fixed contact (8A), and the movable contact, J# (6A)
51C is a fixed contact and opens after being separated from 6 (8A), but the opening/closing switch t11i is installed between the stiffening switch and the opening/closing switch ae, which open and close the energization to the operating coil. This is done by a delay circuit, a relay and K. That is, when the start switch is closed and the switch is turned on, the relay is activated, the relay contact becomes conductive, and the on/off switch 18 is closed, and the crossbar moves and the movable contact (6A) becomes the fixed contact A (8A). come into contact with At this time, the open/close switch (11 closes at the same time as the starting switch because the relay is small), and when the movable contact (6A) contacts the fixed contact (8A), the starting switch closes because the switch has a large capacity. and then closes a little later. Therefore,
For open/close switch QG, the possible contact (6A) is the fixed contact (8A
) will close before contact. On the other hand, when the start switch opens and the switch is cut off, the relay reverses direction, the relay contacts become non-conductive, the delay circuit operates, and the open/close switch ue is delayed. The contact (6A) is separated from the fixed contact (8A). At this time, the opening/closing switch K is opened after the movable contact (6A) is separated from the fixed contact (8A) by the delay circuit.

Note that an auxiliary contact commonly used in a switch may be used as the on/off switch a.

Further, in each of the above embodiments, the present invention is applicable to a switch having a two-point disconnection point, but it goes without saying that the present invention can also be applied to a switch having a single-point disconnection point. . In this case, the two-way three-terminal thyristor 0 or the reverse wind three-terminal thyristor (13) 1) is acceptable.
Connected between the i1 cuff (61) and the fixed contact t81.

〔Effect of the invention〕

As described above, the features of the present invention include at least one fixed contact to which a fixed contact is joined, a movable contact to which a movable contact that approaches and separates from the fixed contact is joined, the above-mentioned 1m+ contact and bii+ constant contact. A bidirectional three-terminal thyristor connected between contacts that conducts when they are in contact with each other.

and a series of a resistor and an on/off switch connected between the gate and non-gate side terminal of the bidirectional three-terminal thyristor.
! Since it is made of a #-electrode, it has the effect of reducing contact wear when turning on and cutting off current without using a special #Il source for gate current.

According to another aspect of the present invention, there is provided at least one fixed contact to which a fixed contact is joined, a movable contact to which a movable contact that approaches and separates from the identified contact is joined, and a combination of the movable contact and the fixed contact. Two reverse-blocking three-terminal thyristors connected in antiparallel between the contacts that conduct when they are in contact, and a series connection body of a resistor and an open/close switch connected between the gate of the thyristor and the non-gate terminal. Therefore, there is an effect of reducing contact wear when turning on and cutting off current without using a special 'I' for gate current.

[Brief explanation of drawings]

Fig. 1 is an electric circuit diagram showing the main parts of a switch according to an embodiment of the present invention, Fig. 2 is an electric circuit diagram showing a main part of a switch according to another embodiment of the invention, and Fig. 3 1 is a half-beam cross-sectional view showing an example of a conventional switch, and FIGS. 4 and 5 are electrical circuit diagrams showing an example of essential parts of the conventional switch shown in FIG. 3, respectively. In the figure, (6I is a movable contact, (6A) is a movable finger, 1. (8) is a fixed contact* (8A) is a fixed contact, 0 is a bidirectional three-terminal thyristor, and (13B) is a reverse blocking three-terminal thyristor. Terminal thyristor. I is a resistor, aS is a battery, αe is an opening/closing switch, αn is an ignition circuit, and G is a gate. Note that the same reference numerals in each figure indicate the same or equivalent parts.

Claims (6)

[Claims] (1) At least one fixed contact to which a fixed contact is bonded; a movable contact to which a movable contact that makes contact with and separates from the fixed contact is bonded; between the contacts that conduct when the movable contact and the fixed contact contact each other; A switch comprising a bidirectional three-terminal thyristor connected to the bidirectional three-terminal thyristor, and a series connection body of an on-off switch and a resistor connected between the gate and non-gate side terminal of the bidirectional three-terminal thyristor. (2) The switch according to claim 1, wherein the contact elements that conduct when the movable contact and the fixed contact are in contact are between the two fixed contacts. (3) The switch according to claim 1, wherein the contact that conducts when the movable contact and the identified contact come into contact is between the movable contact and the fixed contact. (4) at least one fixed contact to which a fixed contact is bonded; a movable contact to which a movable contact that connects and separates from the identified contact is bonded; and an inverse relationship between the contacts that conduct when the movable contact and the fixed contact contact each other. A switch comprising two reverse blocking three-terminal thyristors connected in parallel, and a series connection body of a resistor and an on/off switch connected between the gate and non-gate side terminal of the thyristor. (5) The switch according to claim 4, wherein the contact elements that conduct when the movable contact and the fixed contact are in contact are between the two fixed contacts. (6) The switch according to claim 4, wherein the contact between the movable contact and the fixed contact that conducts when the movable contact and the fixed contact come into contact is between the movable contact and the fixed contact.