DE1640860B1 - SWITCHING DEVICE FOR ELECTRICITY SWITCHING - Google Patents

Description

The invention relates to a switching device for currentless switching a contact that can be actuated by a cam disk in alternating current circuits a controllable, synchronous switching device for executing the actual switching operations electronic switching element can be switched in parallel.

From the German Auslegeschrift 1 114 225 an electrical alternating current switching arrangement for currentless switching of a mechanical switch is known, to which an electronic switching element is located in a parallel branch for performing the actual switching process, the latter being replaced by a mechanical switch due to the combination of mechanical switches and electronic switching elements are bridged and, in the blocked state, are relieved of voltage by a mechanical switch in series. The purpose of this switching arrangement is to avoid arcing when switching and to increase the service life of the mechanical switches.

Furthermore, a washing machine control has been proposed in which a switching device switches several sub-devices to a currentless state by means of a cam disk and the current switchover is carried out by an electronic switching element (German Offenlegungsschrift 1513 259).

The invention is based on the object of providing a switching device create that an independent connection and disconnection of the switching device and a enables currentless switching of the mechanical contact to be actuated.

This object is achieved according to the invention in that for supply and Shutdown of the electronic switching element with this a break contact as well as a Normally open contacts are arranged in series, their switching elements and the switching element of the mechanical contact as contact tongues that are isolated from one another and arranged one above the other are formed, and that the contact tongues through each cam of the cam disc can be actuated in such a way that initially to switch on the electronic switching element the normally open contact and then the mechanical one in the following cam position Contact closes and the electronic switching element in the end position of the cam can be switched off by opening the normally closed contact.

In an advantageous embodiment, the switching elements are a mechanical one Switches united contacts one after the other by cams on the program switch shaft arranged cam plate can be actuated, and it is through the middle switching element a direct connection from the network to a consumer can be established.

The advantages of the invention are in particular that by the mechanical switch in connection with the electronic switching element in a simple manner Way, the currentless connection and disconnection of several consumers is made possible.

An embodiment of the invention is shown in the drawing and is described in more detail below.

F i g. 1 shows the switching device according to the invention in context with a washing machine control; f, i g. 2 shows the structure of the by a cam disk actuated mechanical switch.

The mechanical switch 25 is used to control the electronic switching element 1 with the individual consumers 27, 79, 80 in connection.

The cam switching wheel 29 with its various cams 30, 31, 32, 33 pushes the bent-up end 34 of an uppermost one, which is open in retirement Contact pair 36, 48 of the mechanical switch 25 belonging contact tongue 35 at its movement downwards. The contact is resiliently seated at the end of the contact tongue 35 36, and also an insulating piece 37.

Further contact tongues are located under the contact tongue 35 with the terminal 44 38, 39, 40 with their terminals 41, 42, 43. The contact tongues 35, 38, 39, 40 are seated with their left fixed ends separated in the insulating pieces 45, 46, 47. At the end The two contacts 48, 49 sit on the contact tongue 38. The end of the contact tongue 39 is bent vertically upwards with the piece 50 and carries the contact 51.

Furthermore, the insulating piece sits under the movable end of the contact tongue 39 52. The contact tongue 40 carries at the movable end the contact 53, which is the fixed Contact 54 touched. The terminal of the contact 54 is labeled 55. 56 designated the driven shaft of a program switching mechanism.

At the beginning of a currentless switching process z. B. the cam 32 of the node switching wheel 29, the bent-up end 34 and thus the contact spring 35 downward. As a result, the pair of contacts 36, 48, which are open in the idle state, closes. Since the contacts 53 and 54 are closed by the contact tongue 40 in the rest, is the de-energized - because synchronously - switching electronic switching element 1 via the in series contact tongues or contacts 53, 54, 40, 35, 36, 48, 41 on the Consumer 27 connected without current. The faster lousy little program switch (not shown) for controlling the four-layer triodes of the electronic switching element is assigned to the mechanical switch 25 so that the small program switching mechanism a contact to the consumer 27 has closed before the cam 29 driving Program switching mechanism via the cam 32, the contact tongue 35 down on the contact 48 begins to move. As soon as the contacts 36, 48 have closed, switches the electronic switching element 1 on and operates at zero crossing without spark interference the consumer 27.

As the cam 32 moves further, the cam disk 29 in In the direction of the arrow shown, the contact tongue 35 is also after closing of the working contact 36, 48 pressed further down. The insulating piece 37 presses the mechanical contacts 51 and 49 together, whereby their switching element or contact tongue 39 is closed. So that the consumer, z. B. the consumer 27, over the terminals 42 and 41, the contact tongue 39 and the contacts 51, 49 directly on the Phase voltage.

The electronic switching element 1 can now be closed again. As soon as the electronic switching element 1 has switched off radio-interference-free at the next current zero passage, the further turning of the cam 32 in the direction indicated by the arrow pushes the insulating piece 52 further down and opens the closed contacts 53, 54, whereby the electronic switching element 1 from the mechanical switch 25 switched off and is available for further switching operations with other mechanical switches. To switch off the electronic switching element 1 , the insulating piece 52 presses the contact tongue 40 and thus opens the contacts 53 and 54 (FIG. 1).

After the electronic switching element 1 has been switched off by the consumer, the mechanical switch 25 must again be made ready for the next switching operation, that is to say for disconnecting the consumer 27 from the phase voltage. As the cam disk 29 continues to rotate, the bent-up end 34 runs off the curved flank of the cam 32 and first closes the contacts 53, 54.

Since the contacts 36, 48 are still closed, the electronic Switching element 1 again to the closed contacts 49, 51 via the contact tongue 39 can be connected in parallel. When these contacts are next opened, because the insulating piece 37 moves upwards, the current flows for the consumer 27 only via contacts 36, 48, i. H. only via the electronic switching element 1.

After the electronic switching element 1 has switched off the consumer 27 without sparking in the next current zero passage, the contacts 36, 48 can also be opened again. This takes place in that the rear flank of the cam 32 no longer offers any resistance to the upward movement of the bent-up end 34 of the contact tongue 35. The mechanical switch 25 is thus ready again for the next switching operation of the circuit of a further load 70 or 80.

Claims (1)

Claims: 1. Switching device for the currentless switch cines by a cam-operated mechanical contact in AC circuits to which a controllable, synchronously switching <electronic switching element can be switched in parallel to carry out the actual switching operations, characterized in that for switching on and off the electronic switching element ( 1) with this a break contact (53, 54) and a make contact (36, 48) are arranged in series, their switching elements (35, 40) and the switching element (39) of the mechanical contacts (51, 49) as insulated from one another, Contact tongues arranged one above the other are formed, and that the contact tongues (40, 35, 39) can be actuated by each cam (30, 31, 32, 33,. 1) the working contact (36, 48) and then in the following cam position the mechanical contact (51, 49) closes and in the end position the cam the electronic switching element can be switched off by opening the normally closed contact (53, 54) , 2. Switching device according to Claim 1, characterized in that the switching elements (35, 39, 40J of the contacts (36, 48; 51, 49; 53. 54) can be actuated one after the other by cams (30, 31, 32, 33, ...) of the cam disk (29) arranged on the program switching mechanism shaft (56) and a direct connection between the network and the central switching element (39) a consumer (27 or 79 or 80) can be produced.