DEVICE FOR SUPPLYING A POWER TOOL WITH ELECTRICAL ENERGY, AS WELL AS THE USE OF A LOAD RESISTOR FOR ABSORBING AND/OR CONVERTING ELECTRICAL ENERGY, SYSTEM AND OPERATING METHOD

Abstract

A device for supplying a power tool with electrical energy is provided. The device has a load resistor for absorbing electrical energy, which may be in particular electrical energy that is produced or released when a power tool or its tool is braked. In addition, the released braking energy can be converted into heat by the load resistor. A system which includes a device and a power tool, a load resistor of the device being set up to absorb electrical energy that is released during a braking process of the power tool. The released braking energy can be converted into heat by the load resistor. The use of a load resistor for absorbing such electrical energy released during a braking process of a power tool or for converting the braking energy into thermal energy, as well as an operating method for a system which includes a energy supply device and a power tool.

Claims

1-10. (canceled)

11. A device for supplying a power tool with electrical energy, the device comprising: a load resistor, the load resistor being set up to absorb braking energy released during a braking process of the power tool.

12. The device as recited in claim 11 wherein the load resistor is arranged at an electrical connection in the device.

13. The device as recited in claim 11 wherein the load resistor is designed as a pulse width modulating module or as a binary load resistor.

14. The device as recited in claim 11 wherein the load resistor is designed as a chopper.

15. The device as recited in claim 11 wherein the load resistor is controllable in dependence on an output voltage of the device.

16. The device as recited in claim 11 wherein voltage limits are implemented as hysteresis.

17. The device as recited in claim 11 further comprising a disconnector as overload protection.

18. A system comprising the device as recited in claim 11 and a power tool, electrical energy released during a braking process of the power tool being absorbable by the load resistor.

19. A method for operating the system as recited in claim 18, the method comprising the steps of: a) operating the power tool; b) braking the power tool, whereby electrical energy is released; c) absorbing the released electrical energy via the load resistor or conversion of the released electrical energy into thermal energy via the load resistor.

20. A method comprising using a load resistor to absorb electrical energy released during a braking process of a power tool.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Further advantages will become apparent from the following description of the figures. The figures, the description and the claims contain numerous features in combination. A person skilled in the art will expediently also consider the features individually and combine them to form useful further combinations.

[0029] In the figure, the same and similar components are numbered with the same reference signs. In the figures:

[0030] FIG. 1 shows a view of a preferred embodiment of the device with a load resistor

[0031] FIG. 2 shows a view of a preferred embodiment of the device with a load resistor and a disconnection device

DETAILED DESCRIPTION

[0032] FIG. 1 shows a first preferred embodiment of the device 10 with a load resistor 1, as well as an exemplary power tool 20. The device 10 makes it possible in particular to convert an incoming alternating voltage into a direct voltage, the output direct voltage being in particular a device direct voltage that can be used to supply energy to a power tool 20. The device 10 also comprises a load resistor 1, the power tool 20 and the device 10 being connected to one another by way of a line connection 3. In the sense of the invention, the line connection 3 may in particular also be referred to as an electrical connection. It is preferred in the sense of the invention that the load resistor 1 is arranged in the electrical connection 3. During a braking process of the power tool 20, energy, in particular braking energy 2, may be released. This braking energy 2 can be absorbed by the load resistor 1 of the device 10 and later returned to the power tool 20for example to drive it. An alternating voltage/direct voltage converter (AC-DC converter) and an output capacitor (both: not shown) may also be arranged in the device 10, the output capacitor being arranged in the line within the device 10 essentially parallel to the load resistor 1 at the output of the AC-DC converter. Following the AC-DC converter, the line within the device 10 may go over into a power cord and a power plug, with which the device 10 can be connected to a preferably public electricity or energy network. In the example of the invention shown in FIG. 1, the load resistor 1 may be designed to be switchable, so that it is referred to as a chopper in the context of the present invention. In the sense of the invention, it is therefore possible for the load resistor to be designed as binary (on/off) or PWM-controlled. The device 10 and the power tool 20 form a system 100 in which the device 10 can be used as a line adapter and for supplying the power tool 20 with electrical energy.

[0033] FIG. 2 shows a second preferred embodiment of the device 10 with a load resistor 1 and a disconnection device 4. In the example of the invention shown in FIG. 2, the disconnection device 4 is arranged between the load resistor 1 and the output capacitor, so that within the electrical line within the device 10 the load resistor, the disconnection device 4, the output capacitor and the AC-DC converter are arranged in this order. The braking energy 2 that is released when the power tool 20 is braked is also shown in FIG. 2 by an arrow. The direction of the arrow is intended to indicate that the released braking energy 2 can be transported from the power tool 20 in the direction of the line adapter 1, where it can in particular be converted into thermal energy. The power tool 20 and the line adapter 10 are preferably connected to one another by way of an electrical connection 3 in which the load resistor 1 can be arranged.

LIST OF REFERENCE SIGNS

[0034] 1 Load resistor [0035] 2 Braking energy [0036] 3 Electrical connection between power tool and device [0037] 4 Disconnection device as overload protection [0038] 10 Device [0039] 20 Power tool [0040] 100 System