JPS5842597B2 - lighting control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a lighting control device that detects a power cutoff time and switches lighting circuits.

Many commonly used lighting devices have a safety bulb installed in the main lighting, and the lighting state of these devices is usually switched using a mechanical pull switch or the like.

Recently, a device has been proposed that uses a circuit as shown in FIG. 1 to selectively operate a switching relay to switch a circuit by opening and closing a power switch.

To briefly explain the configuration and operation of this circuit device,
is an AC power supply, and the first contact S1 button is a stationary contact of the power switch SW1 switching relay Ry, and the second contact is an operating contact.
The first lighting device L2 is connected to the button and the second lighting device L2 via a contact S2.

A series circuit consisting of a capacitor C2, a resistor R3, a charging rectifier D3, and a capacitor C1 is connected in parallel to the first contact S1 via a first rectifier consisting of a resistor R1 and a rectifier D1.

The second contact S2 has a resistor R2 button and a rectifier D2.
A second rectifying device consisting of
The relay coil ring is connected to the output terminal of the first rectifier.

Further, a rectifier D4 is connected between the connection point of the capacitor C1 and the rectifier D3 and the output terminal of the second rectifier.
It is inserted in the opposite direction.

When a button is pressed on the control device having such a configuration and the power switch Sw is closed, the first lighting device L1 is turned on and at the same time, the capacitor C1 is charged.

This voltage is determined by the voltage division ratio of resistor R1 and resistor R3.

At this time, since no current flows through the relay coil ring, the contact is maintained at the first contact S1.

Next, when the power switch Sw is opened, the first lighting device turns off, the charge in the capacitor C1 is discharged through the rectifier D4, the relay coil ring, and the resistor R3, and the switching relay Ry is driven to change the contact to the second contact. Switch to S2.

Then, due to the discharge of capacitor C1, switching relay Ry
If the power switch Sw is turned on again while the second contact S2 is held, the holding current flows through the relay coil RcIf (or the resistor R2), so the switching relay Ry can maintain its 1\ state, and the second The lighting device L2 lights up.

Among them, capacitor C2 is for smoothing, and should be selected to have a sufficiently small value in comparison with capacitor C1.

The first button on this control device. Second contact 51S2
In either case, there is a problem in that the capacitor C1 is charged.

This means that when switching from the second contact S2 to the first contact S1, it is necessary to turn on the power switch Sw after the capacitor C1 has finished discharging and the switching relay contact has returned to the first contact S1. It means that.

Regarding this problem, it is possible to reduce the charging pressure of the capacitor C1 through the resistor R2 by appropriately setting the resistors R1, R2, and R3, respectively.
In practice, this becomes extremely difficult when considering variations in parts, voltage fluctuations, etc.

Furthermore, since the switching relay Ry is driven by the discharge of the capacitor C1, the capacitor C1 needs to have a sufficiently large capacity.

Moreover, since the switching relay Ry always operates after the first lighting device L1 is turned on, there is also the problem that it is difficult to use in places where operational noise is a problem.

The present invention aims to provide a control device of this type that does not have the above-mentioned drawbacks, and will be described below with reference to FIG. 2.

Referring to FIG. 2, the rectifier C constitutes a first rectifying device together with a resistor R1, and a capacitor C1 and a resistor R parallel to it constitute a first rectifying device.
The capacitive element consisting of 4 constitutes a reference time setting circuit by discharge.

It consists of a rectifier D6 in parallel with rectifier D5.

The third rectifying device shares the resistor R1 and at the same time includes a dual type flow device D5. This has the meaning of making the circuits connected to D6 independent from each other.

A driving impedance constituted by a capacitive element consisting of a capacitor C3 and a resistor R5 constitutes a contact drive circuit that temporarily supplies a driving current to the relay coil ring by a charging current of the capacitor C3 when a power supply voltage is applied.

In addition, capacitor C4 is mainly for smoothing and switching relay R
It may not be necessary depending on y.

Like buttons and similar parts that play the same role as in FIG. 1 are designated by the same reference numerals.

A control device having such a configuration has a power switch Sw.
When the capacitor C1 is closed, the capacitor C1 is charged with a constant time constant of the resistor R1, and the capacitor C1 forms an impedance.
3, the power supply voltage is not suddenly applied.

Therefore, no driving current flows through the relay coil ring, the contact of the switching relay Ry is maintained at the first contact S1, and the lighting device L175 is turned on.

Next, when the power switch Sw is opened, the charge on the capacitor C1 is discharged through the resistor R4, and the charge on the capacitor C3 is discharged through the resistor R6.

Therefore, if the time constants of both are set sufficiently large on the capacitor C0 side and sufficiently small on the capacitor C3 side, the next time the power switch Sw is turned on, the capacitor C3 will have a voltage equivalent to the charge voltage of the capacitor C1. voltage is applied, allowing a sufficiently large drive current to flow.

When the switching relay Ry operates and the contact is switched to the second contact S2, the relay coil ring has a resistor R2 and a rectifier D2.
A second rectifying device consisting of is connected to form a contact holding circuit, and lighting device L2 is lit.

When switching from the first contact S1 to the second contact S2, no current flows through the relay coil ring, but this type of electromagnetic relay generally has a delay time in its operation, so this is not a practical problem. do not have.

The capacitor C4, which is connected in parallel to the relay coil ring, not only has a smoothing effect, but also discharges its charge when the power is cut off.1. , There is also the effect of operating the switching relay Ry as a delay relay in order to supply a holding current to the IJ relay coil.

The contact is connected to the second contact S2 and the second lighting device L2
While lit, capacitors C1 and C3 are not charged and are reset to their initial state.

Therefore, when the power switch Sw is next opened and turned on again, the contact will remain connected to the first contact S1.

That is, according to the control device of the present invention, the return from the lighting state of the second lighting device L2 to the lighting state of the first lighting device L1 is performed completely regardless of the slowness of operation of the power switch Sw.

As described above, the lighting control device according to the present invention connects the reference time setting circuit only through the first contact of the switching relay, configures the contact drive circuit of the switching relay through the first contact, and connects the reference time setting circuit only through the first contact of the switching relay. The feature lies in the structure of the contact holding circuit.

Therefore, when switching circuits using a power switch, the operating time condition set by the reference time setting circuit is only required when switching from the first lighting device to the second lighting device; In the case of , it can be said that there are no practical limitations, making it easier to use than conventional devices.

In addition, in the device of the present invention, the discharge current of the capacitor that is pressed in the reference time setting circuit does not involve at all in driving or holding the switching relay, so a sufficiently small capacity is sufficient. Since it does not operate, it has the effect of minimizing operating noise.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a conventional lighting control device, and FIG. 2 is a circuit diagram showing an embodiment of the present invention. , D1 to D6 are rectifiers, R1 to R6 are resistors, C1 to
C4 is a capacitor, Ry is a switching relay, Tsutsumi is a relay coil, and Sl and S2 are the first. This is the second contact point.

Claims (1)

[Claims] 1. 2. Connected in parallel to the power supply via the contacts of the switching relay.
a reference time setting circuit consisting of a first rectifier button and a capacitive element connected via a first contact of the switching relay; and a second rectifier connected via a second contact. A contact holding circuit consisting of a device button and a relay coil device and a third rectifier are provided in parallel with the first rectifier, and the third rectifier is connected to the relay coil device via impedance to form a contact. forming a driving circuit, the third
A lighting control device characterized in that the rectifier prevents charging of a capacitive element by the current flowing through the second rectifier. 2. The impedance connected in series with the third rectifier is constituted by a capacitive element, and the capacitive element is equipped with a discharging circuit that discharges the charge in a sufficiently short time by comparing with that of the reference time setting circuit. The lighting control device according to claim 1, characterized in that the lighting control device comprises: