JPS6215721A - Delay circuit - 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 [Field of Industrial Application] The present invention relates to a delay circuit, and particularly to a delay circuit that enables a long delay.

[Conventional technology]

Conventionally, delay circuits have been widely used in various electrical and electronic devices, and most of them are composed of circuits that combine so-called electronic circuits and magnetic relays. Therefore, a low DC voltage source is required to drive the electronic circuit, which requires circuit components such as a transformer and a diode stack, leading to a cost amplifier.

In particular, when delaying operations in units of hours, a clock function circuit using a microcomputer is required, making it difficult to apply to low-priced products. Furthermore, when a magnetic relay is used, current must continue to flow while the magnetic relay is being driven, and therefore power is constantly consumed during that time.

In this case, even if the power consumption of one magnetic relay is minute, when considering the use of hundreds of thousands of magnetic relays, the power consumption becomes enormous and cannot be ignored.

Therefore, the present invention has been made in view of the above-mentioned circumstances, and although it has a long delay function, it does not require a microcomputer, IC, transistor, transformer, etc., and is simple to use. It provides a delay circuit with a simple circuit configuration and minimal power consumption.

[Means for solving problems]

The delay circuit according to the present invention uses a bimorph relay as a circuit opening/closing element for opening and closing the circuit.

[Effect]

A bimorph relay delays the opening and closing of a circuit.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 to 3.

First, FIG. 1 shows the configuration of a bimorph relay A used in the present invention.

In FIG. 1, numerals 1 and 1 indicate bimorph piezoelectric elements facing each other. One end of these piezoelectric elements 1゜1 is fixed to a fixing member 2 made of a conductive material such as metal, and
At the other free end, contact plates 5, 6 with contacts 3.4 are provided with electrodes 7, 8, 9, which are one of the components of the bimorph structure.
．． 10, 11, and 12 are insulated and fixed.

Thus, in the above configuration the electrodes 8, 11 and 7.1
When 0, 9, and 12 are short-circuited and a DC voltage E is applied between them as shown in the figure, the bimorph piezoelectric element 1 is distorted in the direction in which its free ends approach each other, that is, the contacts 3 and 4 are in contact with each other. Then, contacts 3 and 4 are closed. Thereafter, even if the DC voltage E is removed, the contacts remain closed for only a certain period of time.

Also, the equivalent circuit of the bimorph relay A is a leakage resistor F? connected in parallel to the second P and the capacitor CP. , P. Therefore, when the switch S1 is closed and the DC voltage E is applied, the capacitor CP is charged, and as a result, due to the charging, that is, the accumulation of energy in the capacitor CP, the piezoelectric element 1 causes a distortion phenomenon peculiar to the bimorph, and the contacts 3 and 4
will be closed. On the other hand, when the switch S1 is opened, the charge stored in the capacitor CP is discharged via the leakage resistor RP, and at the same time, the contacts 3 and 4, which have been closed until now, are opened.

By the way, the above leakage resistance RP is 10" to 10" according to actual measurements.
Ω, which is an extremely large value, therefore, the discharge takes a long time, and therefore there is a long time delay between opening the switch Sl and the opening of the contact 3.4. According to the authors, this time delay has a value of approximately 40 hours. On the other hand, if the leakage resistance RPO value is made small, the delay time can be made small.

Therefore, by connecting another resistor in parallel with the leakage resistance RP, the value of the leakage resistance RP can be arbitrarily changed isometrically.

FIG. 3 shows a circuit configuration using the bimorph relay A described above.

In the figure, S is an AC power supply, and the AC power supply S includes a load 13 and a control circuit 14 that controls the power supplied to the load 13.
are connected in parallel. Here, the load 13 is provided with contacts 3.4 shown in FIGS. 1 and 2 in series,
The opening and closing of the contacts 3 and 4 is controlled by the control circuit 14 mentioned above.

Next, the configuration of the control circuit 4 will be explained.

In the figure, Ne indicates a neon lamp connected in parallel to the AC power source S, and a capacitor C1 is connected in parallel to the neon lamp Ne via a diode Di.

Further, 15 is a delay circuit connected in parallel to the capacitor C1, and the delay circuit 15 includes resistors R connected in series with each other.
i, switch S2, capacitor C2, switch S3,
connected in parallel to the capacitor c2 and the contacts 3 and 4
A piezoelectric element 1 that opens and closes, resistors R1, R2, R3,
It is comprised of a selection switch s4 that connects any one of these resistors R1, R2, and R3 in parallel to the piezoelectric element 1.

Next, the operation will be explained based on FIG.

First, a smoothed DC voltage is obtained between points T and T by the neon lamp Ne, diode Di, and capacitor C1. When the switch s2 is closed, a DC voltage is applied to the piezoelectric element 1 through the resistor Ri, and as a result, the contacts 5 and 6 are closed by the mechanism described above, and the load 13 is driven. When the switch S2 is then opened, the mechanism causes the closed contacts 3, 4 to open, with a time delay determined by the resistor R1, so that the load 13 is de-energized.

In this case, this delay time can be changed by selecting one of the resistors R1 to R3 using the selection switch S4. Furthermore, by closing the switch S3 and connecting the capacitor C2 in parallel to the piezoelectric element 1, the capacitance of the equivalent capacitor CP shown in FIG. 2 can be increased, and therefore the delay time can be further increased. That is, the combination of the capacitor C2 and the resistors R1 to R3 can change the delay time from opening the switch S2 to opening the contact 3.4. When switches S3 and S4 are both opened and switch $2 is closed, contacts 3.4 are closed and load 13 is driven, but as shown in FIG. is isometrically the capacitor C
Since it is composed of P and an extremely large leakage resistance RP,
In the steady state after the switch S2 is closed, almost no current flows, so it can be said that the power consumption is close to zero compared to conventional magnetic relays.

FIG. 4 is a delay circuit diagram showing another embodiment of the present invention, which differs fundamentally from FIG. 3 in that the switch S2 is connected in parallel with the piezoelectric element 1. Therefore, the fourth
In the circuit shown, when switch S2 is closed, contact 3.
4 is developed. Conversely, when switch S2 is opened, piezoelectric element 1
A voltage is applied to the switch S2, which closes the contacts 3 and 4. In this case, if the resistor R1 is made large, this switch S2
The delay time from opening to closing of contact 3.4 can be increased.

That is, in FIGS. 3 and 4, the operational relationship between switch S2 and contact 3.4 is reversed.

By the way, the delay circuit 15 of the above-mentioned invention can be used as a lighting controller for stairs, hallways, toilets, etc. at home by using a lamp as the load 13. That is, by utilizing the delay operation function, the verification lamp can be kept on for a predetermined period of time after the switch is turned off, thereby improving convenience and usability. Of course, load 1
It goes without saying that 3 may be anything other than a lamp.

〔Effect of the invention〕

As explained above, according to the present invention, a bimorph relay is used as a circuit opening/closing element, so an electronic circuit like the conventional one is not required to obtain a delay time, and a simple configuration is sufficient. Furthermore, in order to change the delay time, a simple combination of resistors and capacitors has the effect of providing a wide range of operation from several seconds to several tens of hours. Furthermore, the power consumption during steady operation is extremely low compared to magnetic relays.
Even if a large number of delay circuits according to the present invention are used, there is no need to worry about the power supply capacity for driving the circuits, which is a great advantage when configuring a system.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a bimorph relay used in the present invention, FIG. 2 is a circuit configuration diagram showing an equivalent circuit of the bimorph relay,
FIG. 3 is a circuit diagram showing a first embodiment of the invention, and FIG. 4 is a circuit diagram showing a second embodiment of the invention. 15...Delay circuit, A...Bimorph relay.

Claims (1)

[Claims] A delay circuit equipped with a circuit opening/closing element that opens or closes a load circuit after a predetermined time has elapsed after a switch is operated, characterized in that a bimorph relay is used as the circuit opening/closing element. .