EP2227817A1

EP2227817A1 - Electrical device

Info

Publication number: EP2227817A1
Application number: EP08866401A
Authority: EP
Inventors: Ulrich Single
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2007-12-27
Filing date: 2008-11-03
Publication date: 2010-09-15
Anticipated expiration: 2028-11-03
Also published as: DE102007062797A1; EP2227817B1; WO2009083310A1; US20100283323A1; US8400013B2; RU2486622C2; RU2010130945A

Abstract

The invention relates to an electrical device comprising a switching unit (12), which is provided for switching a power supply of a consumer unit (14), and a control unit (16) for controlling the consumer unit (14). According to the invention, the electrical device comprises a bridging unit (18) provided for supplying power to the control unit (16) when the power supply is switched off by the switching unit (12).

Description

description

title

electrical appliance

State of the art

The invention relates to an electrical appliance according to the preamble of claim 1.

It is already known an electrical appliance with a switching unit and a control unit. The switching unit is provided for switching a power supply of a load unit and the control unit is provided for controlling the load unit.

Advantages of the invention

The invention is based on an electrical appliance with a switching unit, which is provided for switching a current supply of a consumer unit, and a control unit, which is provided for a control of the consumer unit.

It is proposed that the electrical appliance has a bridging unit which is provided for a power supply for the control unit when the power supply is switched off by the switching unit. In this context, the term "provided" is to be understood as meaning in particular specially equipped and / or specially designed and / or specially programmed. or a control unit, wherein a control unit can be formed both by a processor alone and in particular by a processor and further electronic components, such as memory means and / or electronic components, for example a voltage stabilization capacitor. Furthermore, a "switching unit" is to be understood here as meaning in particular a unit which produces or separates an electrically conductive connection between two components and / or contacts and which has at least one switching element, in particular a mechanical switching element st. Preferably, the present invention is used in electrical appliances with a bipolar switching unit. Basically However, a single-pole switching unit conceivable. In this context, a "bridging unit" should be understood as meaning, in particular, a unit which bridges an electrical connection, which is separated by a switching unit, by means of a conductive connection The bridging unit can be structurally simply formed by a power line and / or particularly advantageously by further components and / or units The embodiment according to the invention can advantageously be used to supply an electrical appliance electronics or individual units and / or components, such as the control unit, of the electrical appliance electronics with an unwanted voltage In addition, an increase in the performance of the electrical appliance can be achieved and / or continued at the beginning of a working process e Additional functions, such as protection functions, are structurally easy to achieve within the electronics industry. The present invention is particularly advantageously suitable for an electrical appliance which is formed by a machine tool, in particular a handheld power tool, such as, for example, an angle grinder.

Furthermore, it is proposed that the bridging unit has a voltage conversion unit. A "voltage conversion unit" should be understood here to mean, in particular, a unit which is intended to convert or change an electrical current having an input voltage into an electrical current having a different output voltage from the input voltage converted to a lower output voltage, which allows a low-energy standby mode of operation, in particular the control unit.

If the voltage conversion unit has a resistance unit, a voltage can be structurally simply converted. In particular, the resistance unit can be integrated in a conventional structure of a switching electronics of the electric device in a particularly cost-effective manner, and thus conventional standard switching components can be used cost-effectively in conjunction with the resistance unit. Here, a "resistance unit" is to be understood as meaning in particular a unit having at least one resistance element, in particular an ohmic resistance. Preferably, the resistance unit is formed by a high-resistance resistor unit, so that an advantageously low and low-cost operating voltage can be achieved in the standby mode of operation. In principle, however, it is also conceivable that the voltage conversion unit instead of the resistance unit further electrical components and / or Units, such as a capacitor, an induction coil and / or other, the skilled person appear appropriate components and / or units.

A structurally simple and component-saving conversion of the voltage, in particular a conversion of an input voltage into a significantly lower output voltage, can be achieved if the resistance unit has at least one high-resistance resistance element. In this context, a "high-resistance resistance element" is to be understood as meaning, in particular, an element which has a resistance value in the range from approximately 5 kΩ to 20 k.OMEGA .. The resistance element may be a capacitor, an induction coil and / or particularly advantageously a resistor be formed.

In addition, it is proposed that the electrical appliance has at least one contact point which conductively connects the bridging unit to an incoming power line. An "incoming power line" is to be understood here as a power line connected to a power plug, which is intended to supply power to the electrical device and / or is understood as an electrically conductive contact with an energy storage unit, such as a rechargeable battery In an alternative to this, the switching unit can also have the contact point, wherein an advantageous continuous power supply of the control unit is achieved by means of the bridging unit in the case of a current-conducting connection of the power line to an electrical power network Here, advantageously, the contact point along a current flow direction in front of a switching point of the switching unit is arranged.

An electrically conductive contact between the bridging unit and the contact point can be achieved structurally simple if the contact point and the bridging unit each have a contact element. Preferably, the contact point and the bridging unit each have two contact elements, whereby the bridging unit can bridge a power supply in an electrical appliance with a two-pole switching unit. If the electrical appliance has a single-pole switching unit, it is sufficient to provide the contact point and the bridging unit with one contact element each. Particularly advantageously, the contact elements are each formed by a contact terminal, so that a simple plug connection between the contact point and the bridging unit can be achieved. - -

In a further embodiment of the invention, it is proposed that the electrical appliance has a further component which forms an assembly unit at least partially with the bridging unit. In this context, a "mounting unit" is to be understood as meaning, in particular, a unit which is mounted as a unit during assembly of the electrical appliance, thereby advantageously saving further components, installation space, assembly effort during assembly of the electrical appliance and, in addition, a particularly compact arrangement Bridging unit can be achieved.

It is further proposed that the mounting unit has at least one housing by at least partially the further component and the bridging unit are arranged, whereby a particularly compact and in particular protected arrangement of Ü bridging unit and / or the other component can be achieved.

In addition, if the mounting unit has a fixing material, a particularly stable arrangement can be achieved within the mounting unit. Particularly advantageous is the fixing of a potting compound, such as macromer, formed. Preferably, the fixing material or the potting compound is filled during a production process after arranging the component and at least one component of the bridging unit in the housing of the mounting unit and then cured, so that the components are fixed to each other and in particular stable within the mounting unit.

If the further component is formed by a capacitor, in particular by an interference suppression capacitor, advantageously at least two functional elements which require an arrangement in the region of the switching unit can be arranged particularly compactly inside the electrical appliance.

In an advantageous development of the invention it is proposed that the mounting unit has at least three contact elements, whereby in particular further components, in particular additional lines and / or cables can be advantageously saved and the mounting unit connected with a minimum number of contacts or electrically connected to other components can be connected conductively. Particularly advantageous here is a contact element to a conductive connection of the bridging unit provided with an incoming power line. Preferably, the two further contact elements form connection elements for the further component.

Furthermore, it is proposed that the mounting unit has an electrically conductive connection which is provided to connect the bridging unit with a connection element. - -

ment of the other component to connect. As a result, additional contact elements, for example for the bridging unit, can be avoided and a compact electronic device electronics can be realized.

drawings

Further advantages emerge from the following description of the drawing. In the drawings, embodiments of the invention are shown. The drawing, the description and the claims contain numerous features in combination. The expert will be the

Expediently consider features individually and summarize meaningful further combinations.

Show it:

Fig. 1 is a formed by a power tool electrical appliance in a schematic representation, Fig. 2 is a circuit diagram of an electrical appliance electronics of the electrical appliance with a

3 shows an assembly unit of the electrical appliance with the bridging unit and with another component in a schematic representation, FIG. 4 shows an alternative embodiment of the bridging unit to the further component in a schematic representation and FIG. 5 shows the bridging unit from FIG. 4 in an arrangement together with the other component within the electrical appliance in a schematic representation.

Description of the embodiments

FIG. 1 schematically shows an electrical appliance 10 formed by a handheld power tool 66. The hand tool 66 is formed by an angle grinder having a rotatably driven disk-shaped tool 68. Along a longitudinal extent 70 of the power tool 66, this has a handle 74 at an end 72 facing away from the tool 68. In one area of the handle 74, the handheld power tool 66 also has a power cable 76 for connecting the handheld power tool 66 to an electrical power grid. By means of the Storm cable 76 an electrical appliance electronics 78 and a motor unit 80 supplied with electrical energy.

FIG. 2 shows in more detail the electronic device electronics 78 of the handheld power tool 66. The electrical appliance electronics 78 has a switching unit 12, which is formed by a two-pole switching unit 12. By means of the switching unit 12, which has two switching contacts 82, 84, a Stormzuführung for a consumer unit 14 formed by the motor unit 80 is switched. In addition, the portable power tool 66 or the electronic device electronics 78 has an internal power line 86 which is arranged between the motor unit 80 and the switching unit 12 or between the switching unit 12 and the power cable 76 and for an electrically conductive connection between the power cable 76 and the motor unit 80 is provided with closed switch contacts 82, 84 of the switching unit 12. The power cable 76 is electrically connected at a contact point 26 with the internal power line 86.

Furthermore, the electrical appliance electronics 78 has a control unit 16, which is provided for controlling the motor unit 80 of the electrical appliance 10, and a capacitor 54 formed by an interference suppression capacitor 88, which at least reduces transmission of interference frequencies occurring during operation of the motor unit 80 to the power grid , The control unit 16 has for this purpose a microcontroller 90, a voltage stabilization unit 92 with a voltage stabilization capacitor 94 and a semiconductor-based separating element 96, which is connected between the microcontroller 90 and the motor unit 80. The semiconductor-based separating element 96 may in this case be formed by a bidirectional thyristor triode and / or further elements that appear appropriate to the person skilled in the art. In principle, a different embodiment of the control unit 16 in an alternative embodiment of the electronic device electronics 78 is also conceivable at any time by the variant of the control unit 16 described or illustrated in FIG. The electrical appliance electronics 78 further has a bridging unit 18, which is provided to supply power to the control unit 16 when the power supply unit is switched off by the switching unit 12. In this case, there is between the electrical device 10 and the

Power supply by means of the power cable 76 is an electrically conductive connection and the motor unit 80 is due to a switching position of the switching contacts 82, 84 in a switched-off operating state. The bridging unit 18 has a voltage conversion unit 20, which is intended to convert a high, incoming mains voltage of the power supply to a low standby voltage for a standby mode of operation of the control unit 16. For this purpose, the voltage conversion unit 20 has a resistance unit 22 with a resistance element 24. The resistance element 24 is formed by a high resistance element 24 and has a resistance of about 10 kΩ.

By means of the high-resistance resistive element 24, a switching contact 82 of the switching unit 12 is bridged. To bridge the further switching contact 84, the bridging unit 18 has a continuous line element 98, which is formed integrally with the internal power line 86. In principle, it is also conceivable, instead of the continuous line element 98, to use a further resistance element and / or another electrical component which appears expedient to the person skilled in the art, such as, for example, an induction coil and / or a capacitor.

The bridging unit 18 is conductively connected at the contact point 26 of the electrical appliance 10 or the electronic appliance electronics 78 to an incoming power line 28 of the power cable 76. For this purpose, the contact point 26 and the bridging unit 18 each have two contact elements 30, 32, 34, 36 which are formed by a contact terminal 38, 40, 42 (cf., for this, FIGS. 3 to 5). In this case, the contact point 26 is formed by two angle contacts 100, 102 which in each case conductively connects the incoming or outgoing power line 28, 104 of the storm cable 76 with two contact elements 30, 32 of the bridging unit 18. In addition, connect the contact elements 34, 36 and the angle contacts 100, 102, the internal power line 86 and the switch contacts 82, 84 with the power cable 76th

FIG. 3 schematically shows a partial area of the bridging unit 18 with the resistance unit 22. The high-resistance resistor element 24 forms with another component 46, which is formed by the suppression capacitor 88, a mounting unit 48. The mounting unit 48 has for this purpose a housing 50 in which the high-resistance element 24 and the suppression capacitor 88, which is formed by a capacitor winding , are arranged. To fix the suppression capacitor 88 together with the high resistance element 24 within the housing 50 of the mounting unit 48, this has a fixing material 52 which is formed by a potting compound, such as macromer. By means of the potting compound of the suppression capacitor 88 and the high-resistance resistor element 24 are fixedly disposed within the mounting unit 48.

The mounting unit 48 also has three contact elements 30, 56, 58, wherein a contact element 30 is formed by one of the contact terminals 38 of the bridging unit 18. The further two contact elements 56, 58 are formed by connection elements 60, 62 for the interference suppression capacitor 88, which are formed by connection pins. By means of the connecting elements 60, 62, the mounting unit 48 during a mounting operation by a simple plug-in operation in to the connection elements 60, 62 corresponding and not shown here contact elements of the electrical appliance electronics 78 and the electrical appliance 10 are introduced (analogous to Figure 4). In addition, the mounting unit 48 has an electrically conductive connection 64, which is provided to connect the high-resistance resistance element 24 with one of the connection elements 60 of the interference suppression capacitor 88, thus providing the assembly unit 48 with a minimum number of contact elements 30, 56, 58 is.

The housing of the mounting unit 48 also has on opposite sides 110, 112 on an outwardly directed surface 114 each have a locking member 116 formed by a knob. By means of the locking elements 116 together with the contact terminal 38 and the connection elements 60, 62, the mounting unit 48 can be mounted structurally simple and captive within the electrical appliance 10 during an assembly process or, in the case of an undesired defect, can be easily dismantled.

FIGS. 4 and 5 show an alternative arrangement of an interference suppression capacitor 88 to FIG. 3, together with a high-resistance resistance element 24 of a bridging unit 18. The high-resistance resistor element 24 is arranged between two line parts 106, 108 of an internal power line 86. A connection 64 between the high-resistance resistance element 24 and the suppression capacitor 88 is formed analogous to the description of Figure 3. In addition, a connection of the resistance element 24 together with the suppression capacitor 88 to the internal power line 86 is analogous to the description of Figures 2 and 3.

As an alternative to the embodiments of the invention in FIGS. 3 to 5, the bridging unit 18 or the resistance unit 22 with the high-resistance resistance element 24 can also be arranged independently or separately from a design or an arrangement of the interference suppression capacitor 88 within the electronic device electronics 78. For this purpose, only the bridging unit 18 or the resistance unit 22 would have to have an additional contact cell for contacting the internal power line 86 within the electronic device electronics 78.

In FIG. 5, a partial section of the electrical appliance 10 additionally shows an arrangement of the interference suppression capacitor 88 together with a resistance unit 22 in a region of a switching unit 12. A connection between the contact element 30 formed by a contact terminal 38 of the bridging unit 18 and a contact terminal 40 of the contact point 26 is effected by a simple plug connection of the two Kontaktklem- men 38, 40. The contact terminals 40, 42 are in this case U-shaped, wherein in Figure 5 each only one leg of the U-shaped contact terminals 40, 42 can be seen. The legs of the U-shaped contact terminals 40, 42 are connected at the contact point 26 by a respective screw 122 with a housing 124 of the electrical device 10. A not visible in Figure 5 leg of the U-shaped contact terminals 40, 42 is provided for making an electrical contact with power lines 28, 104 of a power cable 76. The power lines 28, 104 are this purpose in a terminal, not shown, such as a luster terminal, a conventional standard switch together with the not-to-see legs of the U-shaped contact terminals 40, 42 fixed. The electrical appliance 10 also has two further contact elements 118, 120 into which connection elements 60, 62 of the interference suppression capacitor are inserted and establish an electrically conductive contact with the electronic device electronics 78 or the internal power line 86.

As an alternative to the embodiment variants in FIGS. 3 to 5, it is also conceivable that the contact elements 30, 32 of the bridging unit 18 are formed by a stranded wire and fastened with a contact screw of the contact point 26 and electrically conductive with power lines 28, 104 of the power cable 76 get connected.

Claims

claims

1. electrical appliance with a switching unit (12) which is provided for switching a power supply of a consumer unit (14), and a control unit (16) which is provided to a control of the consumer unit (14), characterized by a bridging unit (18) , which is provided to a power supply for the control unit (16) with a switched-off power supply by the switching unit (12).

2. Electrical device according to claim 1, characterized in that the bridging unit (18) has a voltage conversion unit (20).

3. Electrical appliance at least according to claim 2, characterized in that the

Voltage conversion unit (20) comprises a resistance unit (22).

4. Electrical appliance at least according to claim 3, characterized in that the resistance unit (22) has at least one high-resistance resistance element (24) up.

5. Electrical device according to one of the preceding claims, characterized by at least one contact point (26) which connects the bridging unit (18) conductively connected to an incoming power line (28).

6. Electrical appliance at least according to claim 5, characterized in that the contact point (26) and the bridging unit (18) each have at least one contact element (30, 32, 34, 36).

7. Electrical device at least according to claim 6, characterized in that at least one of the contact elements (30, 32, 34, 36) of a contact terminal (38, 40, 42) is formed.

8. Electrical appliance according to one of the preceding claims, characterized by a further component (46), which forms an assembly unit (48) at least partially with the bridging unit (18).

9. Electrical device according to claim 8, characterized in that the mounting unit (48) has at least one housing (50) by at least partially the further component (46) and the bridging unit (18) are arranged.

10. Electrical appliance at least according to claim 8, characterized in that the mounting unit (48) has at least one fixing material (52).

11. Electrical appliance at least according to claim 8, characterized in that the further component (46) is formed by a capacitor (54).

12. Electrical appliance at least according to claim 8, characterized in that the mounting unit (48) has at least three contact elements (30, 56, 58).

13. Electrical appliance at least according to claim 12, characterized in that at least one of the contact elements (30) is provided for a conductive connection of the bridging unit (18) with an incoming power line (28).

14. Electrical device at least according to claim 12, characterized in that at least two of the contact elements (56, 58) connecting elements (60, 62) for the further component (46) form.

15. Electrical appliance at least according to claim 14, characterized in that the

Mounting unit (48) has an electrically conductive connection (64) which is provided to connect the bridging unit (18) with a connection element (60) of the further component (46).