DE2063799A1 - Electrical timing element for delayed actuation of a switch - Google Patents

Description

2 3rd ÜEZ. 1970

SIEMENS AKTIENGESELLSCHAFT Erlangen,

Berlin "and Munich Werner-von-Siemens-Str.

Our reference: VPA 70/3304 Ml / An

Electrical timing element for delayed actuation of a switch

The invention relates to an electrical timing element for delayed actuation of a switch.

In a known electrical timing element, the switch is actuated via a gearbox coupled to a synchronous motor. The delay time depends on the reduction ratio of the gearbox. Such a reduction gear including of the synchronous motor is complex and takes up a lot of space. In order to have a certain time range with such a timer the reduction ratio must be changed by connecting or disconnecting additional gear wheels. Farther electronic timers are known by which an electromagnetic switching device is controlled. Here is the disadvantage that electrical energy is required to operate the switching device, which is often from a separate Energy source must be supplied.

The invention is based on the object of an electrical timing element To create a delayed actuation of a switch without a drive motor and a reduction gear operated by this and also manages without an electromagnetic switching device.

The object is achieved according to the invention in that that as a member a deforming under the influence of an electrical voltage, an electrical shock

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circle connected piezoelectric body 'between at least a device-fixed abutment and an actuator of the device-fixed switch is arranged.

A preferred embodiment according to the invention "consists in that the timing element consists of a "flexible strip-shaped piezoelectric Body exists. The setting of the timing element and the assembly of the same are simplified by the fact that the ends of the strip-shaped body are mounted in notches of the adjustable abutment and of the actuating member. It can also it can be advantageous to place the strip-shaped body between two devices b to support fixed abutments and the actuating member to the part of the strip-shaped which runs between the abutments To be arranged opposite to the body. A particularly simple timing element results in an advantageous manner in that the strip-shaped body a bilaminar, piezoceramic.es bending element whose electrodes are connected to one of a DC voltage source powered RC control circuit are connected.

According to a further embodiment of the invention, a fall-off delayed timing element results from the fact that the bending element becomes one Parallel RG element is connected in parallel and a pull-on delayed Timing element in that the bending element is connected in parallel with a capacitor and the parallel connection is connected directly on the one hand P the first pole of the DC voltage source and on the other hand via a common series resistor to the second pole of the DC voltage source is connected that further to the capacitor and the bending element, the collector-emitter path of a transistor connected in parallel and the base of the transistor on the one hand via a base resistor to the first pole and on the other hand is directly connected to the second pole of the DC voltage source. There is another pull-in delayed timer in that a series RC element is connected to a fixed resistor connected to the two poles of the DC voltage source connected in parallel, to the resistance of which a diode in blocking

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direction and to its capacitor the bending element connected in parallel and "in which the resistance value of the resistor is very much greater than the resistance value of the Pest resistor.

On the basis of several exemplary embodiments shown in the drawing the subject matter of the invention is described in more detail below. It sows;

Fig. 1 shows the mechanical structure of a timing element with an between a device-fixed abutment and the actuator of a switch arranged strip-shaped piezoelectric Body,

Fig. 2 shows the mechanical structure of a timing element with an on zv / ei device-fixed abutment supported strip-shaped piezoelectric body,

3 shows an electrical circuit arrangement for a delayed-release device Timing element according to the invention,

Fig. 4 shows an electrical circuit arrangement for a pull-on delayed Timing element according to the invention,

5 shows a further circuit arrangement for a pull-on delayed timing element according to the invention.

In Fig. Λ is on one. Housing 1 a switch 3 provided with an actuator is attached. On the side opposite the switch, the housing has a shoulder 4 in which an axially adjustable abutment 5 formed from an adjusting screw 6 and an intermediate member 6a is arranged. On the side facing the adjusting screw, the intermediate member 6a has a notch 7. Likewise, a notch 8 is provided in the actuator 2. Between the intermediate member and the actuator of the switch 3 there is a bilamirtar, piczoceramic Bicgeelement 9 supported in the two notches, the electrodes 10 and 11 of which are connected to corresponding connections of a printed circuit board 12 attached to the housing and containing the electrical circuit elements. The circuit board is in

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only schematically indicated in the drawing. A bilaminar bending element consists of two oppositely polarized elements which, when a DC voltage is applied, turn into opposite ones Deform direction so that a large deflection of the bending element entry.

In the Pig. 2, the bending element 9 is supported on two device-fixed abutments 5a and 5b. "The actuator 2 of the holder 3 is that part of the bending element 9 that runs between the two abutments 5a and 5b arranged opposite. The electrodes 10 and 11 are again connected to the corresponding connections of the circuit board 12. It is advisable to set the switching point more easily one of the two abutments made adjustable in the direction parallel to the bending element.

In the electrical circuit shown in Fig. 3 for a fall-delayed timing element is the bending element 9 with its Electrodes 10 and 11 to the DC voltage poles one with their AC voltage poles connected to a voltage divider R1, R2 lying rectifier bridge G1. To the piezoceramic Bending element 9 is made up of a capacitor 02 and an adjustable one Resistor R3 existing parallel RC element connected in parallel.

In S ¹ Ig. 4, a rectifier bridge G2 is in turn connected with its AC voltage poles to a voltage divider consisting of the partial resistors R10 and R11. The bending element is connected with its electrode 10 directly to the positive pole of the rectifier bridge. A capacitor C10 is also connected with its one connection pole directly to the positive pole of the DC voltage source. With its electrode 11, the bending element 9 is connected to the other terminal of the capacitor C10 'and via a common series resistor R12 to the negative pole of the rectifier bridge G2. The collector-emitter path is also connected to the parallel connection of the Bi.ege element 9 and the capacitor C10

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of a transistor T1 in parallel. The base of this transistor T1 is connected to the positive pole via a base resistor R13 and directly to the negative pole of the linear bridge G2.

Another circuit arrangement for a timing element according to the invention is in Pig. 5 shown. A Pest resistor R20 is connected to the two poles of a DC voltage source. to A series RG element R30, C20 is connected in parallel to this plague resistor E20, to its resistor R30 in turn a diode D and to its capacitor C20 the bending element 9 is kept parallel is. . *

This circuit arrangement has the advantage that, in its basic structure, it is suitable for both a pull-on and a drop-off delay Timing element is the same. The illustration in FIG. 5 applies to a timer with a pull-on delay. Should the timer be drop-delayed switch, only the Pest resistor R20 and the resistor R30 have to be interchanged. This can be done for Example take place with the help of a changeover switch, so that with this circuit arrangement, the timing element drop-out or as desired can be used with a delay. The changeover switch can be saved if the plague resistor R20 is connected to the negative pole and the resistor R30 with the capacitor C20 each via a detachable one Clamp connection is connected. By interchanging the two resistor connections, the corresponding switchover is also made of the timer reached.

The timing element according to the invention works as follows:

If the electrodes 10 and 11 of the bending element 9 to a When DC voltage is applied, the bending element is deformed and thereby actuates the switch 3 via its actuating element 2. When the DC voltage is switched off, the bending element takes on its original porin again, so that also when it is deformed back a switching command is triggered when the switch 3 is expediently is listed as a toggle switch.

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If, to the circuit of FIG. 3, an alternating voltage is applied to the When the voltage divider R1, E2 is applied, it also charges as a capacitor acting bending element 9 and deforms accordingly. At the same time, the capacitor C2 of the parallel RC element also becomes charged. If the alternating voltage is switched off again and again, it is discharged the bending element uncL-the capacitor C2 via the adjustable Resistance R3 according to the time constant of the circuit. With the unloading of the bending element, the reverse deformation also begins same. As soon as a certain path has been covered during the back deformation is, the switch 3 is actuated and thus a switching command is triggered. By adjusting the adjustable resistance R3 the drop-out delay can be set.

With the circuit according to Pig. 4, the bending element 9 and the capacitor C10 are charged in accordance with the common series resistance R12 specific time constants. According to the Charging, in turn, the bending element 9 is deformed and triggers a switching command after a certain time. By adjusting the Partial resistance R10 of the voltage divider R10 / R11 becomes the height the voltage changes and thus also the delay in picking up the timing element. If the timer is switched off, a Discharge of the bending element and the capacitor CIO via the Base resistor R13 and the common series resistor R12. The one generated by the discharge current at the common series resistor R12 The voltage drop raises the potential at the base of the transistor T1, so that the transistor becomes conductive and the bending element and short-circuits the capacitor 010. In this way, the timer is ready to be switched on again quickly.

At that time parted after Pig. 5 v / earth the capacitor C20 and the bending element 9 charged via the resistor R30. After a certain charge has been reached, the bending element has deformed so far that it triggers a switch 3 command. When the timer is switched off, the capacitor C20 and the bending element 9 discharge via the diode D and the Pest resistor R20. Because the resistance value of the plague resistor R20 is much smaller

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as the resistance value of the resistor R3O, the Discharge with a correspondingly smaller time constant.

The fixed resistor R20 and the resistor R30 are among each other interchanged, the result is a small time constant for charging, but a correspondingly large time constant for discharge, so that a delayed shutdown is achieved. A timing element provided with this circuit arrangement can thus be used can be easily changed from pull-on delay to drop-off delay.

From the condition that the resistance value of resistor R30 should be much greater than the resistance value of the Pest resistor E2O, it follows that the time constants for the and discharging of the capacitor and the bending element are correspondingly different in size. On a delayed sidepiece is thus the charging time constant T1, which is equal to the product of the The resistance value of the resistor R30 and the capacitance value of the capacitor C2O is much greater than the discharge time constant T2, which is the product of the resistance value of the plague resistance and the capacitance value of the capacitor C20 results. If the timer works with a drop-out delay, T1 acts as a discharge and T2 as a charging time constant.

When the circuit arrangement according to FIG. 5 is connected to the DC voltage poles a rectifier bridge fed by an alternating voltage is connected, the time constant T2 should also be much larger be than the reciprocal value of twice the frequency of the alternating voltage, to avoid excessive discharging of the capacitor 020 and the Avoid bending element 9 if the instantaneous value of the ripple DC voltage is below the value of the voltage on capacitor G20 and on bending element 9 lies.

10 claims
5 Fig.

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Claims (1)

- 8 - VPA 70/3304 Claims Electrical timing element for the delayed actuation of a switch, characterized in that a timing element is used Deforming under the influence of an electrical voltage, connected to an electrical control circuit, piezoelectric Body (9) between at least one device-fixed abutment (5) and an actuator (2) of the device-fixed Switch (3) is arranged. W 2, timing element according to Claim 1, characterized in that the timing element consists of a flexible, strip-shaped piezoelectric body (9). 3. Timing element according to claim 2, characterized in that the Ends of the strip-shaped body (9) in notches (7,8) of the adjustable abutment (5) and the actuating member (2) are mounted. 4. Timing element according to claim 2, characterized in that the strip-shaped body is supported on two device-fixed abutments and the actuator between the abutments k running part of the strip-shaped body opposite is arranged. 5. Timing element according to claim 2, 3 or 4, characterized in that the strip-shaped body is a bilaminar, piezoelectric The bending element (9) has its electrodes (10, 11) connected to an RC control circuit fed by a DC voltage source (G1, G2) are connected. 6. timing element according to claim 5, characterized in that the Bending accelerator (9) connected in parallel to a parallel RC element (C2, R3) is. 209828/0 36 5 - 9 - VPA 70/3304 7 »Ze 11; subdivided after. Claim 6, characterized in that the Resistance (R3) of the EC element is adjustable. 8. timing element according to claim 5, characterized in that the Bending element (9) connected in parallel with a capacitor (C10) and the parallel connection on the one hand directly to the first pole (+) of the DC voltage source and on the other hand via a common series resistor (R12) to (fen second pole (-) of DC voltage source connected i3t that further to the capacitor (C10) and the bending element (9) the collector-smitter path of a transistor (T1) connected in parallel and the base of the transistor on the one hand via a base resistor (R13) is connected to the first pole (+) and, on the other hand, directly to the second pole (-) of the DC voltage source. 9. Timing element according to claim 8, characterized in that the parallel circuit (9, C10) together with the series resistor (R12) with the DC voltage poles of one AC side is connected to a voltage divider (R10, R11) connected rectifier bridge (G2). 10. Timing element according to claim 9 »characterized in that the Voltage divider (R1O, R11) is adjustable. 209828/0365 ORIGINAL BATHROOM Blank page