JPH083938Y2 - Control circuit of automatic switch - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control circuit for an automatic switch, and more particularly to a closing control circuit for an automatic switch capable of obtaining a predetermined opening delay time.

[0002]

2. Description of the Related Art Conventionally, as a closing control circuit for an automatic switch, for example, Japanese Utility Model Publication No. 63-24578 has been proposed. In this closing control circuit, a pair of rectifier circuits having different voltage levels are connected to the magnet, and the magnet is energized by a large DC voltage of the rectifier circuit at the time of closing to switch on the switch. By energizing the magnet with a small level of DC voltage, the magnetized state is maintained. A parallel circuit of a relay contact and a resistor is connected in series to the magnet, and when the switch is opened, the relay contact is opened by no voltage of the operating voltage, and the magnet, the resistor, and the pair of rectifier circuits are connected. A current based on the counter electromotive force of the magnet is made to flow through a closed circuit formed by one.

[0003]

However, in the closing control circuit as described above, even if the resistance inserted in series with the magnet is reduced, the delay of the opening time is not sufficient, so that the delay time is sufficient. A closing control circuit is desired.

The present invention has been made in order to solve the above problems, and an object thereof is to provide a control circuit for an automatic switch which can sufficiently secure a delay opening time.

[0005]

Means for Solving the Problems] This invention is between the power supply terminal
A power relay that is connected to, relative to the power relay
Open delay capacitor connected in parallel with the power supply
A rectifier circuit connected between the terminals and a closing switch.
Is connected in series with the input coil and the input coil,
A relay that closes when the power relay is excited and opens when it is demagnetized.
-A closing circuit including a contact and connected to the rectifying circuit
And connected to the rectifier circuit and switch on
During holding, the closing coil is connected in series with the closing coil.
Holding carp that keeps the switch in the closed state in cooperation with the coil
And a holding circuit that includes a
The current supply from the rectifier circuit to the closing coil.
Apply the loop current of the counter electromotive force generated when the battery is dropped
The gist of the present invention is to provide a diode for delaying the opening of the coil.

[0006]

[Function] With the above configuration, when the power is turned on, voltage is applied between the power supply terminals
Is applied, the power relay is activated, and
The relay contact is closed, and a rectifier circuit is used to
The ill is excited and the switch is turned on. And the
When holding, the input coil and the holding coil cooperate to open and close
Hold the vessel in the closed position. When holding this power supply,
When the voltage applied between the source terminals is released, the open delay capacitor is
Discharge current flows from the sensor and the power relay holds for a predetermined time
To be done. As a result, the relay contacts of the closing circuit are kept closed.
It At this time, a voltage is impressed between both terminals of the closing coil.
Since no longer pressurized, it is generated in the counter electromotive force charged coil
It Due to this back electromotive force, the relay contact , diode
Since the loop current flows in the closed loop circuit consisting of
Demagnetization of the coil is delayed, and the opening operation of the switch is delayed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying the present invention will be described below with reference to FIG. Surge absorber Z between terminals P1 and P2
Diode D2 for single-phase bridge rectification via 1
A rectifying circuit as a DC power supply circuit is connected, which is composed of surge absorbing capacitors C2 to C5 for protecting D5 and the diodes D2 to D5. A series circuit composed of a diode D1, a resistor R1, and a power relay X1 is connected between the terminals P1 and P2. C1 is power relay X1
Is an open delay capacitor connected to both terminals of.

Between the output terminals of the rectifier circuit, via a surge absorber Z2, a-contacts X2 / a1 and X2 / a2 of a power relay X2, which will be described later, a closing coil CC, and a power relay. A closing circuit made up of a series circuit of a-contact X1 / a of X1 is provided. Further, between both output terminals of the rectifier circuit, a normally closed contact as a switching element A, a b contact MS1 / b of a limit switch, a power relay X2.
And the series circuits of and are respectively connected.

Further, both terminals of the series circuit of the a contacts X2 / a1 and X2 / a2 are normally open contacts, which are normally open contacts.
And a holding circuit composed of a series circuit of the holding coil HC is connected. Further, the closing coil CC, a contact X1
A diode D6 for delaying the closing coil CC is connected between both terminals of the series circuit of / a.

The b contact MS of the limit switch
1 / b is a normally-closed contact when the switch is open. When the switch is turned on, it is turned off immediately before the closing of the switch, and when the switch is opened again. It turns on. The a contact MS1 / a of the limit switch is a normally open contact when the switch is open, and is turned on when the switch is closed and the power relay X2 is de-excited. The switch is turned off again when the switch is opened.

That is, the limit switch is a one-circuit, two-contact type limit switch consisting of a-contact MS1 / a and b-contact MS1 / b. Next, the operation of the control circuit configured as above will be described.

When a voltage is applied between the terminals P1 and P2 while the switch is open, the power relay X1 is excited and the output current output from the rectifier circuit is increased. -Exciting relay X2. Then
Power relay X1 a-contact X1 / a, power relay X2
A-contacts X2 / a1 and X2 / a2 are closed, and as a result, the closing coil CC is excited and the switch operates to close against an open spring (not shown). At this time, since the a contact MS1 / a of the limit switch is in the OFF state, the circuit of the holding coil HC is separated from the circuit of the closing coil CC, and the output current output from the rectifier circuit is the closing circuit. Supplied only to.

Then, before the closing of the switch is completed, the b contact MS1 / b of the limit switch is turned off, the excitation of the power relay X2 is released, and the a contact X2 / a thereof is released.
1, X2 / a2 is opened. At the same time when the excitation of the power relay X2 is released, the a contact M of the limit switch
S1 / a is turned on, the output current from the rectifier circuit flows into the holding circuit, the holding coil HC and the closing coil CC are excited, and the closing of the switch is held.

When the voltage applied between the terminals P1 and P2 is released while the switch is turned on, a discharge current flows from the open delay capacitor C1 and the power relay X1.
Is held for a predetermined delay time. At this time, the input coil C
Since the voltage is not applied between both terminals of C, the a-contact X1 / a, due to the counter electromotive force generated in the closing coil CC,
A loop current flows through a closed loop circuit including a diode D6, and a closing coil C is generated based on the loop current.
Due to the excitation of C, the opening operation of the switch is delayed. Then, when the discharge delay capacitor C1 is discharged, the power relay X1 is deenergized and the a-contact X is released.
1 / a is turned off.

As a result, the excitation of the holding coil HC and the closing coil CC is released, so that the switch is opened by the opening spring. In conjunction with this operation, the b contact MS1 / b of the limit switch is turned on and the a contact MS1 / b
When a is turned off, a standby state in which the next closing operation can be performed is entered.

The present invention is not limited to the above embodiment, and can be arbitrarily modified without departing from the spirit of the present invention.

[0017]

As described above in detail, the present invention can delay the opening operation of the switch with a simple circuit configuration. Further, in the case of an instantaneous power failure within the delay time, the opening operation of the switch can be prevented due to the delay operation of the switch . Also, adjust the capacity of the delay capacitor for opening.
Adjustment, you can change the operating time of the power relay
Because of this, the relay contact of the power relay
Adjustable time to open circuit, resulting in delay
The interval can be set to a predetermined time.

[Brief description of drawings]

FIG. 1 is a control circuit diagram of an automatic switch according to an embodiment of the present invention.

[Explanation of symbols]

P1 to P4 ... Terminals, D1 to D6 ... Diodes, C1 to C
6 ... Capacitor, R1, R2 ... Resistor, X1, X2 ... Power relay, X1 / a1, X1 / a2 ... A contact, X2 / a
1, X2 / a2 ... a contact, MS1 / a ... limit switch a contact, MS1 / b ... limit switch b contact,
CC: input coil, HC: holding coil, D6: diode.

Claims (1)

[Scope of utility model registration request] 1. A power relay connected between power terminals.
(X1) and an open circuit connected in parallel with the power relay (X1).
A discharge delay capacitor (C1), a rectifier circuit connected between the power supply terminals, a closing coil (CC) for closing a switch, and a closing coil for closing the switch.
Power relay connected in series with the power relay (CC).
Relay connection that closes when (X1) is excited and opens when demagnetized.
Point (X1 / a) and connected to the rectifier circuit.
Input circuit and connected to the rectifier circuit, and keeps the switch closed
Sometimes it is connected by connecting in series with the closing coil (CC).
Holds the switch in the closed state in cooperation with the coil for CC (CC)
A holding circuit including a holding coil (HC) and a closing coil (CC) provided in parallel with each other.
The current supply from the rectifier circuit to the IC (CC) is cut off.
Applying a loop current of back electromotive force generated when
A control circuit for an automatic switch, comprising a diode (D6) for delaying the opening of (CC) .