JPS6215720A - 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 more particularly to a delay circuit that allows a long delay and can arbitrarily set the delay time.

[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 an increase in cost.

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, and is provided with a delay time setting means for arbitrarily setting a delay time.

[Effect]

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

Further, the delay time is arbitrarily set by the delay time setting means.

〔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, reference numeral 1.1 indicates piezoelectric elements having a bimorph structure 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 arranged as 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. After that, even if the DC voltage E is removed, contact 3. The shield remains closed for a certain period of time.

Further, the equivalent circuit of the bimorph relay A is equivalent to the leakage resistor RP connected in parallel to the second P and the capacitor CP. 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 bimorphs, and contacts 3.4 close. On the other hand, when the switch S1 is opened, the charge stored in the capacitor CP is discharged through the leakage resistor RP, and at the same time, the contacts 3.
4 is developed.

By the way, according to actual measurements, the above leakage resistance RP is 10'? l ~ 10 Ω, which is a very large value, and therefore the discharge takes a long time, and therefore there is a long time delay between opening the switch S1 and opening the contact 3.4. According to experiments, this time delay has been found to be approximately 40 hours. On the other hand, if leakage resistance RP
By decreasing the value of , the delay time can be decreased. 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 contacts 3 and 4 shown in FIGS. 1 and 2 are provided in series with the load 13,
The opening and closing of the contacts 3 and 4 is controlled by the control circuit 14.

Next, the configuration of the control circuit 14 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, and switch S3,
Connected in parallel to the capacitor c2 and the contact 3.4
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. A delay time setting means P is constituted by the resistors R1, R2°R3, the selection switch s4, and the capacitor C2.

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 and the diode )'Di, :1 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 closed.
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, and thus de-energizes the load 13.

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. Also, when both switches 33°S4 are opened and switch S2 is closed, contacts 3.4 are closed and load 13 is driven, but as shown in FIG. 2, piezoelectric element 1 is Isometrically, 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 contact 3.4.In this case, if the resistance Ri is increased, 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, the power consumption in the steady state of operation is extremely small compared to magnetic relays, so 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, and the system can be configured. This is a big advantage in this case. Furthermore, since the present invention includes a delay time setting means, the delay time can be set arbitrarily.

[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...MH circuit, A...bimorph relay, P...delay time setting means.

Claims (1)

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