JPH0487118A - Delay switch - Google Patents

Abstract

PURPOSE:To realize cost reduction and accuracy of ON/OFF control, by feeding an electric current to a load and a current transformer by putting a return type switch ON, and radiating a photoelectric distortion element by lighting a lamp connected to the secondary side of the current transformer. CONSTITUTION:When a return type switch 11 is made to be ON, an electric current flows to a load 10 and a current transformer 12, and a lamp 17 connected to the secondary side of the transformer 12 is lighted and radiation is made to a photoelectric distortion element 15. As a result, the element 15 is bent and a constantly open switch 13 is closed, and even if the switch 11 becomes OFF, the electric current flows to the load 10 through the switch 13, and when the switch 11 becomes OFF, the electric current of the transformer 12 is cut off and the lamp 17 is turned off, and the element 15 is restored after a fixed time, and the switch 13 is opened and electrification to the load 10 is stopped. As a result, a structure becomes simple and cost-reduction is realized, and also ON/OFF control is accurately performed irrespective of a load.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a delay switch used in lighting equipment, ventilation fans, and the like.

[Conventional technology]

A conventional delay switch has a configuration in which the output from the current transformer is applied as a gate signal to a triac connected in parallel with this circuit, and the triac is turned on while this gate signal is present, and the input to the current transformer is connected to a capacitor. The circuit stores the data and outputs it for a certain period of time.

[Problem to be solved by the invention]

Conventionally, in order to configure a delay switch, the common method is to accumulate the output from a current transformer and control the gate of a triac, but this is a complicated circuit and requires measures such as malfunction prevention and anti-surge prevention. There was a problem in that the size and cost were also high because of the need for the same. Furthermore, since a triac is used, there is a problem in that on/off control tends to become unstable depending on the load.

Therefore, the object of this invention is to have a simple structure, reduce costs, and turn on regardless of the load.

An object of the present invention is to provide a delay switch that can accurately perform off control.

[Means to solve the problem]

The delay switch of the present invention is provided with a series circuit of a reset type switch and a current transformer, a normally open switch is connected in parallel with this series circuit, a photoelectrostrictive element is provided which bends when receiving light and closes the normally open switch, and the current transformer is connected in parallel with a normally open switch. A lamp is connected to the secondary side and placed at a position where it can irradiate the photoelectrostrictive element.

[Function] According to the delay switch of the present invention, when the reset type switch is turned on, current flows through the load and the current transformer.
A lamp connected to the secondary side of the current transformer lights up and irradiates the photoelectrostrictive element. As a result, the photoelectrostrictive element is bent and the normally open switch is closed, and even if the return type switch is turned off, current flows to the load via the normally open switch. When the reset type switch is turned off, the TEA flow of the current transformer is cut off, the lamp goes out, and after a certain period of time, the photoelectrostrictive element is restored, the normally open switch is opened, and the current supply to the load is stopped.

〔Example〕

An embodiment of the present invention will be described based on FIGS. 1 and 2.

In Fig. 1, 10 is a load consisting of a lamp of a lighting equipment connected to a commercial power supply 14, and a series circuit of a resettable switch 11 and a current transformer 12 is connected to this load 10. A normally open switch 13 such as a snoop action switch is connected in parallel with the switch. A photoelectrostrictive element 15 made of a PLZT bimorph is provided adjacent to the normally open switch 13.
A protrusion I6 is provided protruding from the normally open switch 13 side.

Further, a lamp (or LED, etc.) 17 is connected to the secondary side of the current transformer 12, and the lamp 17 is arranged at a position to illuminate the extended side surface of the photoelectrostrictive element 15 on the side opposite to the normally open switch. The photoelectrostrictive element 15 is normally kept in a dimly lit state, is curved by irradiation with the lamp 17, and the protrusion 16 pushes the normally open switch 13 to close it. Furthermore, a contact spring I8 is disposed at the tip of the photoelectrostrictive element 15 so that when the photoelectrostrictive element 15 is bent, it comes into contact with the electrode at the tip, and at this time, the electrodes of the photoelectrostrictive element 15 are short-circuited through a resistor 19. It is composed of

Next, the operation will be explained. Incidentally, FIG. 2 shows a time chart thereof. First, when the reset switch 11 is turned on manually, the load 10 and the current transformer 12 are energized, and the lamp 17 is turned on. The photoelectrostrictive element 15 is bent by the irradiation of the lamp 17, and the normally open switch 13 is closed. The return type switch 11 turns off when human power is removed, but the load is turned off through the normally open switch 13 side.]
0 continues to be energized. When the photoelectrostrictive element 15 bends, the contact spring 18 comes into contact with the electrode, and the two electrodes of the charging strain element 150 are short-circuited through the resistor 19, and the electromotive force is discharged in a certain period of time (several seconds to several minutes), and the photoelectrostrictive element 15 returns to its original state. Then, the normally open switch 13 is opened and the lamp of the load 10 is turned off.

According to the delay switch configured in this way, as shown in FIG. 2, when a certain period of time has elapsed after the reset switch 11 is turned on and current is applied to the load 10, the current is automatically turned on to the load 10. Stop.

In this way, the delayed operation can be achieved with an extremely small number of parts, resulting in a simple structure and cost reduction. Furthermore, since on/off control is performed using the normally open switch 13, malfunctions are less likely to occur compared to structures such as conventional electronic circuits.

Note that the load may be a ventilation fan motor or the like.

Furthermore, there may be no contact spring 18 or resistor 19 that comes into contact with the photoelectrostrictive element 15 when the photoelectrostrictive element 15 is bent, and the photoelectrostrictive element 15 may return to its original state by self-discharging.

〔Effect of the invention〕

According to the delay swift of this invention, when the reset switch is turned on, current flows through the load and the current transformer.
A lamp connected to the secondary side of the current transformer lights up and irradiates the photoelectrostrictive element. As a result, the photoelectrostrictive element bends, the normally open switch closes, and even if the reset type switch is turned off, current flows to the load via the normally open switch. When the reset switch is turned off, the current in the current transformer is cut off and the lamp goes out, leaving a halo for a certain period of time! The strain element is restored, the normally open switch opens, and the current to the load is stopped.The structure is simple and costs can be reduced, and on/off control can be performed accurately regardless of the load. can get.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention, and FIG. 2 is a time chart thereof. DESCRIPTION OF SYMBOLS 10...Load, 1...Reset type switch, 12...Current transformer, 13...Normally open switch, 15...Photoelectrostrictive element, 17...Lamp diagram

Claims (1)

[Claims] A series circuit of a reset type switch and a current transformer,
A normally open switch connected in parallel with this series circuit, a photoelectrostrictive element that curves upon reception of light and closes the normally open switch, and a photoelectrostrictive element connected to the secondary side of the current transformer and arranged at a position where it can irradiate the photoelectrostrictive element. A delay switch with a lamp and a