KR20010023474A - Protective circuit - Google Patents

Abstract

The invention concerns a protective circuit provided with additional switching function by exciting an electric adjusting component. The excitation signals to said adjusting component (1) are guided, between a first removable plug-type connector (2) and the adjusting component inside a housing, by means of an adapter plug (4; 17) with another removable plug-type connector, such that with the second removable plug-type connector, a protective switch (12) can be inserted in the excitation circuit of the adjusting component.

Description

Protective circuit

For example, a so-called two hand-protective circuit for excitation of an adjustment member or an electric machine is described in "AEG-Reference 1, Basics of Electronic Technology, Elitera Publisher, Berlin 1972, pages 417, 418". It is known, in which case the current circuit for supplying electricity to the machine is cut off at any time using a separate emergency-off-switch.

The present invention relates to a protection circuit for exciting an electrical adjustment member according to the features of the independent claims.

1 shows an additional plug connector for a protective switch and a magnet as an electrical adjustment member;

Figure 2 is a detailed view of an additional adapter connector and connector having two inputs for the protective switch.

3 is an electrical equivalent circuit diagram.

FIG. 4 shows a second embodiment of an adapter plug and two inputs in mutually perpendicular relationship; FIG.

5 shows a detailed view of the adapter plug according to FIG. 4.

6 shows an electrical equivalent circuit of the adapter plug according to FIG. 4.

The advantage of the protection circuit according to the invention of the above-mentioned kind in the features of claim 1 is simply that the existing plug connector in an electrical device (for example according to DIN) is expanded. The excitation signal for the adjustment member is guided by an externally connectable protective switch between the first removable plug connector and the adjustment member inside the housing. There is an advantage that the protective circuit can be realized in the excitation circuit of the adjustment member by means of an additional removable plug connector mechanically coupled with the plug connector described above.

According to a preferred embodiment of the present invention, an additional adapter connector having two inputs can be easily fitted to the first plug connector, and in some cases can be fixed using one center screw, so that one input The part forms a first plug connector for the excitation signal of the adjustment member and the other input part forms a second plug connector for the protection circuit. The excitation circuit or the control circuit is not coupled in the mechanical structure of the device and it is possible at any time using simple means to mount the circuit later. Therefore, complicated cabling, clamping or soldering operations for devices that are often relatively inaccessible can be omitted.

At this time, the excitation signals are guided by a protection switch arranged in series as in the prior art, and a transzorb-diode is connected to avoid a disturbing peak voltage through a protection switching operation in the adapter plug. In this case it is bridge-over with the pole of the excitation line.

Other advantageous embodiments are presented in the dependent claims.

Embodiments of the protection circuit according to the invention are described in detail with reference to the drawings.

1 shows a magnet 1 as an electrical adjustment member for a hydrostatic system, which is supplied with excitation signals for operating the adjustment member using a first plug 2 via a cable 3. The plug 2 is not connected directly to the corresponding plug connection in the housing of the magnet 1 according to the invention but rather by the adapter plug 4.

The adapter plug 4 has one input 5 for the excitation line, an additional plug 7 and the other input 6 for the connection of the protective switch. The adapter plug 4 is shown in detail in FIG. 2 with its inputs 5, 6 and an additional plug 7. The output 8 of the adapter plug 4 is fitted directly into the magnet 1 and fixed by screws 9. The screw 9 is shown in plan in FIG. 1. The necessary electrical connections inside the adapter plug 4 are made by crimping or soldering, in which case the other details shown in the figures are not critical to the configuration according to the invention.

An electrical equivalent circuit diagram of the protection circuit according to the invention is shown in FIG. 3, in which case an excitation line for the magnet 1 is provided between the contact 11 and the contact 10 of the input 6. 12) is opened and closed. Therefore, by inserting an additional plug 7 the protective switch 12 with the release function selected for the application can be simply connected to the existing device by the adapter plug 4.

In the output 8, a transzob diode 15 is arranged as a protection against the peak voltage which causes a disturbance during switching operation between one pole 13 and the other pole 14 of the connection of the magnet 1. do. Contact 16 means ground.

As a variant of the embodiment according to FIG. 1 in the second embodiment according to FIG. 4, there is shown an adapter plug 17 having inputs 5, 6 arranged at right angles to one another. The protective switch 12 is connected by the plug 7, in which case the plug is fitted in the longitudinal direction of the magnet 1.

5 shows several perspective views of the adapter plug 17 with the inputs 5, 6 arranged at right angles to one another according to FIG. 4.

Compared to the equivalent circuit diagram according to FIG. 3, it can be seen in the equivalent circuit diagram according to FIG. 6 that the geometric arrangement of the input units 5 and 6 is different, in which case the two equivalent circuit diagrams are functionally identical.

Claims (6)

In a protection circuit provided with an additional switching function upon excitation of an electrical adjustment member, The excitation signals for the adjustment member 1 are guided by another removable plug connector between the first removable plug connector 2 and the adjustment member inside the housing so that the protective switch 12 can be operated using the second removable plug connector. A protection circuit, which can be inserted into an excitation circuit of the adjustment member. 2. An additional adapter connector (4, 17) with two inputs (5, 6) is fitted in the first plug connector (2), and the one input (5) is for excitation signals. Protective circuit, characterized in that it forms a first plug connector and the other input part (6) forms a second plug connector for the protective switch (12). 3. Protective circuit according to claim 2, characterized in that the second input (6) for the protective switch (12) has a shape perpendicular to the plug connector (8) guided towards the adjustment member (1). 4. The protection circuit according to claim 1, wherein the excitation signals are guided by a protection switch located in series with the excitation current circuit. 5. The additional adapter plugs 4, 17 have a poles 13, 14 of the excitation line which can be connected with the adjusting member 1. Protective circuit, characterized in that the protection using a diode (15). 6. A protection circuit according to any one of claims 1 to 5, wherein said adjustment member is a magnet for a hydroelectric excitation and control system in a vehicle.