WO1999011939A1

WO1999011939A1 - Protective circuit

Info

Publication number: WO1999011939A1
Application number: PCT/DE1998/000803
Authority: WO
Inventors: Dietmar Meier
Original assignee: Robert Bosch Gmbh
Priority date: 1997-09-04
Filing date: 1998-03-19
Publication date: 1999-03-11
Also published as: JP4157273B2; TW461152B; KR20010023474A; EP1009937B1; JP2001515257A; CN1130504C; KR100530687B1; DE59811516D1; EP1009937A1; ATE268437T1; DE19738637A1; CN1269873A

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

Safety circuit

State of the art

The invention relates to a safety circuit for the control of electrical actuators according to the preamble of the main claim.

For example, so-called two-hand safety circuits for controlling actuators or electrical machines are known from "AEG Aid Book 1, Fundamentals of Electrical Engineering, Elitera Verlag Berlin 1972, pages 417, 418", in which a separate emergency stop switch is used Circuit to supply the machine can be interrupted at any time.

Advantages of the invention

The safety circuit of the type specified at the outset has the characterizing features of Claim 1 particularly advantageous in that an already existing plug connection (for example according to DIN standard) can be expanded in an electrical system in such a way that the control signals for an actuator between a first detachable plug connection and the actuator inside a housing via a externally connectable safety switch can be performed. An additional detachable plug connection, mechanically combined with the plug connection mentioned above, can thus advantageously be used to implement a safety circuit in the control circuit of the actuator.

According to a preferred embodiment of the invention, an additional adapter plug with two inputs can be simply plugged onto the first plug connection and possibly secured with a single central screw, so that one input is the first plug connection for the control signals of the actuator and the other input is the second plug connection for the safety switch forms. This retrofitting of the circuit is possible at any time with simple means without interfering with the control or regulating circuit or the mechanical design of the system. Time-consuming cable clamping or soldering work on the often relatively inaccessible system is therefore no longer necessary.

The control signals are routed in a manner known per se via the safety switch in series, and a transzorb diode which bridges the poles of the control line can also be connected in order to avoid disruptive voltage peaks caused by the safety switching operations in the adapter plug. Further advantageous embodiments are specified in the subclaims.

drawing

Exemplary embodiments of the safety circuit according to the invention are explained on the basis of the figures. Show it:

Figure 1 is a view of a magnet as an electrical actuator with an additional connector for a safety switch;

FIG. 2 shows a detailed view of the additional intermediate plug with two inputs and a plug for the safety switch;

Figure 3 is an electrical equivalent circuit diagram;

FIG. 4 shows a second exemplary embodiment of the intermediate connector with two inputs which are each at right angles to one another;

Figure 5 shows detailed views of the adapter according to Figure 4 and

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

FIG. 1 shows a magnet 1 as an electrical actuator for a hydraulic system, which is supplied with a first connector 2 via a cable connection 3 with control signals for actuating the actuator. According to the invention, the plug 2 is not connected directly to a corresponding plug coupling on the housing of the magnet 1, but via an intermediate plug 4.

The intermediate connector 4 has an input 5 for the control line and another input 6 for connecting a safety switch via an additional connector 7. The intermediate connector 4 is shown in detail with its inputs 5 and 6 and the additional connector 7 in FIG. The output 8 of the intermediate plug 4 is plugged directly onto the magnet 1 and fastened to it by means of a screw 9. The screw 9 can be seen in FIG. 1 in a top view. The necessary electrical connections are made in the interior of the intermediate plug 4 by crimping or soldering, the further details shown in the figure not being essential for the construction according to the invention.

An electrical equivalent circuit diagram of the safety circuit according to the invention is shown in FIG. 3, wherein the control line for the magnet 1 can be switched through or disconnected between the connection point 10 and the connection point 11 of the input 6 by means of a safety switch 12. By plugging in the additional plug 7, a safety switch 12 with a trigger function selected in each case for the application can be easily connected to the existing arrangement via the intermediate connector 4. A transzorb diode 15 is arranged between the one pole 13 of the connection of the magnet 1 at the output 8 and the other pole 14 as protection against disturbing voltage peaks during the switching operations. The connection point 16 represents the ground connection.

In a second exemplary embodiment according to FIG. 4, an adapter plug 17 is shown as a modification to the exemplary embodiment according to FIG. 1 with inputs 5 and 6 arranged at right angles to one another. The plug 7, via which the safety switch 12 is connected, is inserted in the longitudinal direction of the magnet 1.

The illustration according to FIG. 5 shows various views of the intermediate connector 17 with inputs 5 and 6 according to FIG. 4 lying at right angles to one another, reference being made here to the explanations relating to FIG.

From the equivalent circuit diagram according to FIG. 6, the different geometrical orientations of the inputs 5 and 6 in comparison to the equivalent circuit diagram according to FIG. 3 can be seen, the equivalent circuit diagrams, however, having the same function.

Claims

claims

1) Safety circuit, with

- An additional switching function in the control of an electrical actuator, characterized in that

- The control signals for the actuator (1) are guided between a first detachable plug connection (2) and the actuator inside a housing via a further detachable plug connection such that a safety switch (12) into the control circuit of the actuator (12) via the second detachable plug connection. 1) is insertable.

2) Safety circuit according to claim 1, characterized in that

- On the first connector (2) an additional adapter (4, -17) with two inputs (5,6) can be plugged, with one input (5) the first connector for the control signals and the other input (6) second connector for the safety switch (12) forms.

3) Safety circuit according to claim 2, characterized in that

- The second input (6) for the safety switch (12) is angled at right angles to the plug connection (8) which leads to the actuator (1).

4) Safety circuit according to one of the preceding claims, characterized in that

- The control signals are routed via the safety switch (12) located in series in the control circuit.

5) Safety circuit according to one of claims 2 to 4, characterized in that

- In the additional adapter (4; 17), the poles (13, 14) of the control line to which the actuator (1) can be connected are protected with a transzorb diode (15).

6) Safety circuit according to one of the preceding claims, characterized in that

- The actuator is a magnet for hydraulic control systems in motor vehicles.