DE102011000597A1 - Electromotive furniture drive with a power supply device and a mains isolation device - Google Patents

Abstract

An electromotive furniture drive with an energy supply device (5) and a mains isolation device (8) should be designed such that the energy supply device (5) and the network isolation device (8) are functionally improved. According to the invention, the mains isolation device (8) is disengaged with a current flow limiter and with at least one switching element. The switching element (25) is provided with a control input and a switching output, the control input being controlled by the current flow limiter and the switching output being connected in series with a current flow limiter. The electromotive furniture drive according to the invention is particularly suitable for adjusting components of a slatted frame.

Description

The invention relates to an electromotive furniture drive with a power supply device and a mains isolation device for adjusting movable furniture components relative to each other, according to the preamble of claim 1.

Such electromotive furniture drives are known in different embodiments. They are designed as linear drives with a linearly adjustable output member or as rotary drives with a rotating output member and have proven themselves in practice. The linear drives have one or a number of electric motors, wherein each motor is followed by a Drehzahlreduziergetriebe and another the Drehzahlreduziergetriebe downstream transmission, for example in the form of a threaded spindle gear, which generates a linear movement of the driven member from the rotational movement of the motor. The rotary drives have at least one speed reduction gearbox connected downstream of the respective electric motor, with the last gearbox element forming the driven element. The output member of the respective electromotive furniture drive communicates with a fixed and / or with a movable furniture component, so that during an operation of the electric motor, the movable furniture components are adjusted relative to each other. The furniture can be designed as a slatted base, work table, bed, lying surface, treatment couch, hospital or nursing bed, as well as a lifting device for persons such as lifters or patient lifts.

For operation of the electric motor furniture drives switching power supplies have proven to be very good as power supply facilities. The power supply device has an operating state Off when disconnected from the mains and an operating state in normal operation. The switching power supplies have an isolation transformer connected by a control module with a high frequency, which can also be referred to as a transformer or as a high-frequency transformer, which is switched on and off by an upstream semiconductor switch on the primary side with a high switching frequency. For this purpose, the control module is assigned a separate intermediate circuit, which has a power source of the control module and supplies the control module with an electrical energy.

The document DE 10 2006 049 715 A1 illustrates a power supply for motor drives, which is designed in a plug housing as a switching power supply.

It is still the prior art of a mains isolation or activation unit explained in more detail, wherein the activation unit has at least one network-side controlled switch in the form of a relay switch or a semiconductor switch for disconnection from the network. In the non-energized state of the activation unit, the at least one controlled switch is in an open state and does not conduct mains voltage to the power supply device. When the operator presses a manual operation key, the activation unit changes from the non-energized state to the energized state, with the controlled switch or the contacts of the controlled switch changing to a closed state, supplying the power supply device with the electrical energy from the network. Now the operating state of the power supply device changes from the operating state Off to the operating state operating.

When operating electromotive furniture drives with switching power supplies as power supply equipment in conjunction with mains disconnections, there is the disadvantage that high inrush currents of the switching power supplies require appropriately adapted high-current switch in the mains clearances. A remedy are correspondingly enlarged relay contacts of the unlocking unit of the prior art, but which are more expensive to buy, beyond a larger space and thus cause new housing and associated costs. Furthermore, increased relay contacts produce significantly louder switching noise, which is perceived by the user to be particularly disadvantageous.

The invention has for its object to provide an electromotive furniture drive of the type described in more detail with an improved power supply device and an improved power supply device.

The solution is achieved in an electromotive furniture drive with a power supply device having the features of the characterizing part of claim 1.

Advantageously, the mains isolation device has a Stromflußbegrenzer and at least one switching element, and the switching element further comprises a control input and a switching output, wherein the control input is controlled by the Stromflußbegrenzer or wherein the switching output is connected in series with a Stromflußbegrenzer.

An inventive electromotive furniture drive with a power supply device, a mains isolation device and a Manual control for adjusting movable furniture components relative to each other, the electromotive furniture drive having at least one Drehrichtungsumkehrbaren electric motor, wherein each electric motor is followed by a Drehzahlreduziergetriebe and wherein each Drehzahlreduziergetriebe another gear is connected downstream, and wherein the power supply device has a network connection has, which with the network The power supply device transforms the line-side input voltage into an output-side low voltage, and has an isolating transformer or a transmission unit for galvanic isolation between the network input side and the low voltage output side for operation of the electromotive furniture drive, wherein the power supply device in the manner of a switching power supply is formed and a DC link, a Steuereinrichtun g for controlling the switching power supply, and the control device is associated with a network-connected control supply, wherein the power supply device has an operating state off when disconnected from the grid and an operating mode operation in normal operation, wherein the mains isolation device, the power supply device or the electromotive furniture drive has an auxiliary voltage source is characterized in that the mains isolation device comprises a Stromflußbegrenzer and at least one switching element, and the switching element has a control input and a switching output, wherein the control input is controlled by the Stromflußbegrenzer or wherein the switching output is connected in series with a Stromflußbegrenzer.

In accordance with the invention, the switching element of the mains disconnecting device is associated with a Stromflußbegrenzer, which is easy to assemble in an advantageous manner and is simple and inexpensive in construction. It is particularly advantageous that the switching element of the power cut-off device can be attached to the Stromflußbegrenzer invention to each of the aforementioned power supply devices, so that no complex variety is given variety. The switching element of the mains isolation device is opened in the de-energized state, thereby disconnecting the connection between the 230 volt network and the power supply device.

In accordance with a first and simplest embodiment, a current flow limiter is connected in series with the switching output of the switching element of the network-disconnecting device.

According to a second embodiment, a current flow limiter is associated with the control input of the switching element of the mains isolation device.

The switching element of the mains isolation device may be formed by relay contacts or by semiconductor contacts or by semiconductor switches and switches in response to actuation of a hand control of the electromotive furniture drive, wherein the semiconductor switch comprises a power transistor, a triac, a MOSFET or the like or is formed by or by an electronic relay , In response to the actuation of a button of the manual control, the switching element of the mains isolation device switches the mains voltage to the power supply device of the electromotive furniture drive and thus connects the power supply device to the 230 volt network of the energy supplier. In this case, the switching element is formed in a preferred embodiment as a unipolar switching element, may be formed in a development and, depending on the requirements as a multi-pole switching element.

The current flow restrictor may be formed by an electrical resistance, a thermistor (NTC), a choke, an RC element, a switch, or combinations thereof. Another embodiment of a Stromflußbegrenzers has an interconnection of an electrical resistance and / or a thermistor and / or a throttle and / or an RC element and / or a switch and / or another switching element such that the Stromflußbegrenzer according to other possible embodiments by a combination of which is formed, for example, by an interconnection of a resistor and a thermistor in an exemplary series circuit of a resistor with a thermistor, is formed. Such Stromflußbegrenzer or Stromflußbegrenzerschaltungen are connected in a particularly simple design manner with the switching output of the switching element of the mains isolation device in series.

Furthermore, the switching element of the mains isolation device has a control input with control input terminals, which are connected together with an auxiliary voltage source and with a signal generator, which is triggered and switched by a manual control, to a control circuit. The triggered by the manual control or switched signal generator is formed in a preferred embodiment as normally open and is switched by the button of the manual control either directly or indirectly. In the latter case, the manual control is designed as an infrared hand switch or as a wireless hand switch with a wireless transmission link or bus hand switch with a data transmission path, wherein a Receiver of the respective transmission path forms the respective signal generator in the form of a transistor switch or a relay switch. If a push-button of the manual control is now actuated, then the push-button switch of the manual control or the signal transmitter closes the control circuit, as a result of which the contacts of the switching element of the mains cut-off device close or conduct and connect the power supply device to the 230 volt mains. In this case, an auxiliary voltage source is provided in the control circuit, as will be explained below.

In another embodiment of the Stromflußbegrenzers this is connected to a control input of the switching element of the mains isolation device. In this case, one could also speak of a Stromflußbegrenzungsschaltung, because here also several electronic components can be interconnected. For the sake of simplicity, however, it is still written by a current flow limiter. According to this embodiment, wherein the Stromflußbegrenzer is in operative connection with a control input of the switching element of the power supply device, the current limiter is formed by a zero voltage switch, which can also be referred to as zero-crossing switch.

In this case, the zero-crossing switch is constructed as a discrete or integrated circuit and communicates with its input terminals to the mains connection of the mains isolation device in operative connection. The zero-crossing switch checks the course of the line-side AC voltage and outputs at its control output an electrical signal at the point of the zero crossing or in an area around the point of the zero crossing of the line-side AC voltage. The output of the zero-voltage switch is connected to the input of the switching element of the mains isolation device in direct electrical connection or in indirect electrical operative connection.

A direct electrical connection is formed by a direct line connection or by interposed voltage conditioning or voltage limiting elements such as resistors and capacitors. In a further and preferred embodiment, the signal generator is also arranged in direct connection to the output of the zero-crossing switch such that a series circuit is formed and a signal in the control input of the switching element can only be fed when the output of the zero-crossing switch and the signal switch.

An indirect electrical active connection is given by the fact that between the output of the zero-crossing switch and the control input of the switching element logic switches or logic gates are arranged. As a combination switch come in this embodiment, relays, optocouplers or a switching contact of the manual control. In a further development of the aforementioned embodiments are logic gates or logic switches with the input terminals and / or with the supply terminals of the zero-crossing switch in direct electrical connection or in indirect electrical operative connection. It should also be noted that an indirect electrical active connection forms the transmission of electrical signals via a galvanic separation point, as is done for example by an optocoupler or a relay. In a particular embodiment of the zero-crossing switch, this is a galvanic isolation between its input terminals and its output terminals.

In a current limiter designed as a zero-crossing switch, the switching element of the mains cut-off device has a control input with control input terminals, which are connected together to form a control circuit with an auxiliary voltage source and with a signal generator, which is triggered and switched by a manual control. The switching element of the mains isolation device is preferably formed in this embodiment as a semiconductor switch. The triggered by the manual control or switched signal generator is formed in a preferred embodiment as normally open and is switched by the button of the manual control either directly or indirectly. In the latter case, the handset is designed as an infrared hand switch or as a wireless handswitch with a wireless link or bus hand switch with a data link, a receiver of each link forms the respective signal generator in the form of a transistor switch or a relay switch.

If now a button of the manual operation is pressed, the button of the manual control or the signal generator closes the control circuit, according to a first embodiment, the output terminals of the zero-crossing switch, according to a second embodiment, the power supply terminals of the zero-crossing switch, according to a third embodiment, the control inputs of an optocoupler or a relay and / or according to a fourth embodiment, at least one terminal of a logic gate is incorporated in the control circuit. As a result of pressing the manual control key, the contacts of the switching element of the power cut-off device close, in addition, if the zero-crossing switch at its output Switching signal switches and the power supply device is connected to the 230 volt network.

In this case, the control circuit with the auxiliary voltage source has the decisive advantage that both are arranged galvanically isolated from the mains voltage. For this purpose, in a preferred embodiment, an optocoupler be provided as a galvanic release agent, wherein the control input of the optocoupler is integrated with the auxiliary circuit and the switching output of the optocoupler is electrically connected in a further circuit to the control input of the switching element of the mains release device. As an alternative to the optocoupler, a relay may be provided, wherein the terminals of the coil form the control input. Furthermore, in a further embodiment, the logic gate is formed as an AND gate or formed by a signal generator. Thus, a control signal is only given to the control input of the switching element of the power supply device when the button is pressed the manual operation and at the same time the zero crossing switch switches a switching signal at its output.

As mentioned above auxiliary voltage source can be formed as network-connected or as a grid-independent auxiliary voltage source in an advantageous manner and according to all the aforementioned embodiments, a further development provides a network-independent auxiliary voltage source with a charging circuit, which is limited in time connected to the network connectable. For this purpose, a timer is provided, which supplies the charging circuit at predetermined time intervals of for example several hours or days with energy from the 230 volt network. In a structurally simple manner, the timer has an RC element and at least one transistor switch and receives its supply voltage from the auxiliary voltage source mentioned above. The output terminals of the timer are connected to the aforementioned signal generator or with another signal generator in direct electrical connection or in indirect electrical operative connection. Now, if a predetermined time has elapsed, the signal generator of the timer switches the control circuit and the control input of the switching element of the mains isolation device and the power supply device is connected to the network. In this case, the power supply device transforms the line-side input voltage into an output-side extra-low voltage for the electrical supply of the charging circuit of the auxiliary voltage source and / or for the electrical supply of the motor control and / or of the at least one linear drive or the electromotive furniture drive. After a second period of time, the aforementioned timer switches the signal generator again as normally open and opens the control circuit, so that the switching element of the mains isolation device opens again or does not become conductive and the power supply device is disconnected from the mains again. In accordance with a further embodiment, the charging circuit of the mains-independent voltage source has another signal generator which, upon reaching a charged auxiliary voltage source, gives such a switching signal to the switching element of the mains isolation device that the mains isolation device releases again and disconnects the power supply device from the mains.

A mains-independent voltage source is formed by a battery, a rechargeable battery or by a storage capacitor of higher capacity, for example in the form of an electrolytic capacitor or in the form of a gold cap. A charging circuit may be designed as a rechargeable battery charging circuit or as a capacitor charging circuit according to the prior art and will not be explained in detail at this point.

Other characteristics and features will be apparent from the following description of a preferred embodiment and are the subject of further subclaims.

Reference to the accompanying drawings, the invention will be explained in more detail. Show it:

1 an exemplary and schematic representation of a designed as a linear drive furniture drive according to the invention with a power supply device and a mains isolation device;

2 a schematic block diagram of the power supply device according to 1 ; and

3 a schematic block diagram of the mains isolation device according to 1

4 a block diagram of a network release device

5 a block diagram of a mains isolation device as a variant of 4

6 a block diagram of a mains isolation device as a further variant of 4 and

7 a block diagram of a mains isolation device as a variant of 5 ,

The 1 shows an electromotive furniture drive 1 with a power supply device 5 and a power-off device 8th ,

The electromotive furniture drive 1 is a so-called linear drive 2 , and the power supply device 5 is designed as a switching power supply. The mains isolation device 8th will be explained in detail below. The linear drive 2 has, depending on the direction of rotation of an electric motor not shown a retractable and extendable lifting tube 3 on, at its free end a connection part in the form of a clevis 4 is appropriate. Another connection part in the form of another clevis 4 is on the housing of the linear drive 2 attached. The respective connection part is in a manner not shown in each case with a furniture component in connection, so that when operating the electric motor to the linear drive 2 connected furniture components move relative to each other.

The power supply device 5 is as shown 1 via an input cable 9 with the mains isolation device 8th connected. The mains isolation device 8th has a power plug, which is only hinted at. Only on actuation of the linear drive 2 through a manual operation 7 switches the mains isolation device 8th the input-side mains voltage via the input cable 9 to the power supply device designed as a switching power supply 5 , which outputs a low voltage in the form of a DC voltage on the secondary side and this via a supply cable 9 ' to a motor control 6 forwards. Is the operation of the linear drive 2 through the hand control 7 finished, the mains isolation device switches 8th out, ie the input cable 9 and the power supply device 5 are mains voltage free.

At the engine control 6 is the manual operation 7 connected in a wired manner, as shown in FIG 1 the manual operation 7 has two pushbuttons. According to another embodiment, not shown, the manual control 7 via a wireless transmission link with the engine control 6 coupled and transmits radio waves or infrared light waves for controlling the at least one electric motor, ie linear drive 2 to the engine control 6 ,

As shown 1 is in a first embodiment, the manual control 7 with a motor control 6 in conjunction, with the engine control 6 is designed as a relay control with relay switches and / or as a semiconductor circuit with semiconductor switches. The manually operated push-buttons of the manual control 7 switch the control current of the relay switch or the semiconductor switch, wherein the power switch of the relay switch or the semiconductor switch, the high motor current of the linear drive 2 turn.

According to the presentation of the 1 is in a second embodiment, the manual control 7 with the engine control 6 connected to the supply cable 9 ' the power supply device 5 and a motor cable of the electric motor of the linear actuator 2 and the electrical leads of the manually operable push-buttons of the manual control 7 connects with each other. According to this embodiment, the contacts of the manually operable push-buttons of the manual control 7 designed as a circuit breaker and switch at high pressure the high motor current.

In a further, but not shown embodiment, the power supply device 5 in the housing of the linear drive 2 used or attached to it, the linear drive 2 may be constructed in a manner not shown in the manner of a double drive, which receives at least one motor, but preferably two motors in a common housing.

2 shows a schematic block diagram of a first embodiment of the power supply device 5 to 1 ,

The power supply device 5 has an input circuit 10 , a DC link 11 , a transmitter unit 14 , a secondary unit 15 , an optocoupler 16 , a control device 17 and a control supply 18 on.

The entrance circle 10 is on the input side (indicated by arrows) with the mains isolation 8th and input cables 9 coupled. In the entrance circle 10 are common Netzentstörglieder, such as capacitors and chokes, as well as fuses included, which are not shown here. Furthermore, the input circuit has at least one NTC thermistor resistance in at least one input line. This thermistor resistor serves to limit an inrush current of the power supply device 5 , The entrance circle 10 is with the DC link 11 connected, which is a rectification 12 and a switching module 13 , z. B. a switching transistor having. The DC link 11 is with the switching module 13 to the transmitter unit 14 coupled. The transmitter unit 14 has a transformer with galvanic isolation 19 on, which is through the power supply device 5 extends through. At the secondary side of the transmitter unit 14 is the secondary unit 15 connected, which a supply voltage Uv for supplying the linear drive 2 via the supply cable 9 to the engine control 6 provides. A reaction of the secondary unit 15 is via an optocoupler 16 with galvanic isolation 19 to the controller 17 arranged. The control device 17 controls the switching module 13 for regulating the supply voltage Uv of the secondary unit 15 , The control device 17 is going through a control supply 18 supplied with electrical energy.

In this case, the power supply device 5 an operating state off in the event of disconnection from the mains and an operating state in normal operation.

3 shows a schematic block diagram of the mains isolation device 8th to 1 ,

The mains isolation device 8th includes an auxiliary power source 20 , a rectifier unit 21 , a control block 22 , a network relay 23 with relay contacts 24 , and a switching element 25 with a drive block 26 , The signal generator described above can also according to the further description as a control signal generator 27 be designated.

The auxiliary voltage source 20 is designed here as a transformer, which with its primary winding to a network connection 30 , for example mains plug or terminal strip, connected. Preferably, the transformer is a short-circuit proof type, but may also have additional fuses primary and / or secondary side. Its secondary winding generates a small AC voltage through the rectifier unit 21 rectified and sieved (filter condenser is not shown) is. A line of the auxiliary DC voltage thus generated is connected to a terminal of the control block 22 and with a connection of the mains relay 23 connected. The other line of the auxiliary DC voltage leads to a control signal generator 27 which, for example, by the hand control 7 or an affected by this control member, which is not considered closer is formed. The control signal generator 27 has the function when operating the manual control 7 to close a closing contact and thus the other line of the auxiliary DC voltage with the respective other terminal of the control block 22 and the network relay 23 connect to.

The network relay 23 here has two relay contacts 24 as a make contact, each of which is in a line from the mains connection 30 is arranged. The one relay contact (here the right one) is connected to a line of the input cable 9 connected, wherein the other relay contact with a terminal e of the switching element 25 connected is. The switching element 25 in turn is via a connection a with the other line of the input cable 9 connected. A third connection s of the switching element 25 is at the drive block 26 connected, which with an output x of the control block 22 connected is.

How it works:
When operating the manual control 7 becomes the control signal generator 27 closed and connects the other line, z. B. the minus line, the auxiliary DC voltage with the other terminals of the control block 22 and the network relay 23 , The control block 22 and the network relay 23 Thus, the auxiliary DC voltage is applied. The mains relay pulls 23 and closes the relay contacts 24 de-energized. The one contact 24 connects a power line to the one line of the input cable 9 , The other contact 24 Switches the other power line to the terminal a of the switching element 25 , which is not turned on yet. The control block 22 now switches over the control block 26 the switching element 25 after a certain time delay, which then connects its terminal e to its terminal a and the other power line to the other line of the input cable 9 on.

The control block 22 is formed in a first embodiment as a turn-on delay, for example via a timer (RC element or the like). In another preferred embodiment, the control block 22 a zero-voltage switch, which by means of the auxiliary DC voltage or the secondary winding of the auxiliary transformer 20 (Connection is not shown, but easily imaginable) determines a zero crossing of the mains voltage and at this time the switching element 25 turns.

The switching element 25 is, for example, a semiconductor switch, a triac, and the drive block 26 is a suitable optocoupler with appropriate circuitry, which is not shown in detail. The optocoupler enables galvanic isolation. A small time delay of the optocoupler switches the triac only after a bounce of the relay contacts 24 This time delay is acceptable.

In this way, a high inrush current of the power supply device 5 the relay contacts 24 Do not damage when switching on, as these switch off. Thus, the power relay can be designed with conventional contact material in the usual contact size.

The embodiments described above do not limit the invention. It is modifiable within the scope of the appended claims.

Thus, for example, a feedback may be inserted which is the control block 22 in execution as a zero voltage switch tells when the relay contacts 24 actually closed. The zero voltage switch remembers this and corrects the time delay for the next power up.

An inrush current limit can also be effected by a disconnectable resistor, which is looped into the power line. This is one another relay or a semiconductor switch necessary for switching.

All relays can also be replaced by semiconductor switches.

One or more chokes may be in series with at least one relay contact 24 be switched.

Furthermore, it should be mentioned that individual components of the electromotive furniture drive 1 modular and some of these modules have a common housing or each of a separate housing. Thus, for example, according to a first embodiment, the mains isolation device 8th in a first housing, which can be plugged directly into a power outlet, for example, the power supply device 5 in a second housing, the engine control 6 in a third housing and the linear drive 2 arranged in a fourth housing. In further embodiments, any combinations are possible, for example, the power supply device 5 and the engine control 6 have a common housing or wherein all modules with at least one linear drive 2 are arranged in a common housing.

The 4 illustrates a mains isolation device 8th according to the prior art. There is the mains isolation device 8th essentially of a switching element 25 , which according to the 4 through a network relay 23 with relay contacts 24 is formed. A control signal generator 27 is in direct or indirect connection with a manual control 7 and an auxiliary voltage source not shown here 20 , Will now be a button of manual control 7 actuated, the control signal generator switches 27 a control circuit which the auxiliary voltage source 20 , the control signal generator 27 and the control input of the grid relay 23 having. As a result, the relay contact closes 24 and the input of the power supply device 5 is connected to the mains 30 connected. The power supply device 5 according to the 4 is designed as a switching power supply and when pressing a button of the manual control 7 the operating status changes from the switching power supply to the operating status operating. This is the moment of closing the relay contacts 24 often associated with a very high current flow, especially if the amplitude of the mains voltage is clearly pronounced. The current flow is particularly high when the relay contact 24 is coincidentally closed at the apex of the sinusoidal AC line voltage, which can make a voltage jump in the power line in the form of a flicker optically visible and is distracting. Particularly powerful switching power supplies as energy supply device 5 By their nature, they have this feature because they have electronic ballasts in their input circuit compared to conventional transformers. Furthermore, the known power relay 23 of the prior art are no longer used because they are unsuitable for the high inrush current, even if this only isolated and depending on the phase position of the mains side AC voltage. The design change of the mains isolation devices 8th By using larger and Stromstromrobustere relay has not proven in practice technically, because despite all this too high contact erosion and in addition to excessive noise of such relay is present.

The 5 shows in accordance with the invention a particularly advantageous and particularly easy to install mains isolation device 8th as an inventive development of 4 where a current flow limiter 35 is provided, which in the simplest and in accordance with the invention with the switching output of the switching element 25 electrically connected in series. Here is the Stromflußbegrenzer 35 designed as a thermistor (NTC). In another embodiment of the Stromflußbegrenzers not shown in detail 35 this is formed as an electrical resistance or as an interconnection of an electrical resistance with an NTC, for example in the form of a series circuit or a parallel circuit. The switching element 25 can also be designed as a semiconductor switch.

This version after 5 can also as a particularly inventive extension of an embodiment according to 4 be considered, it has been shown that this embodiment of the invention according to 5 into the existing network release devices 8th can be included without the component cost is increased significantly and without the cost of the enclosing housing components must be changed.

The 6 shows another development of 4 , wherein the switching element 25 as a network relay 23 with a relay contact 24 is formed, and is formed in another embodiment not shown as a semiconductor switch. According to this illustration, the current flow limiter 35 as a zero crossing switch 31 trained and has one with the power connection 30 connected control input on. The zero-crossing switch is monitored or detected via this control input 31 so to speak, the line-side AC voltage and is at its switching output an electrical signal at the point of zero crossing or in an area around the point of the zero crossing of the sine wave of the line-side AC voltage out. The output of the zero-crossing switch 31 is as shown 6 with an input of a logic gate 32 electrically connected. Will now be a button of manual operation 7 actuated, the control signal generator switches 27 and the output of the zero-crossing switch 31 at the same time a signal to the logic gate 32 , which is formed as an AND gate, as a result of which then an electrical signal at the output of the logic gate 32 is present, which is electrically conductive or electrically signal transmitting to the control input of the switching element 25 is connected, and as a result, the switching contacts of the switching element 25 close or the semiconductor layers of the switching element 25 turn on, so that the power supply device 5 with the mains connection 30 connected is. In a manner not shown is the control input of the switching element 25 and / or the signal output of the logic gate 32 switched on a self-holding circuit according to the prior art, which the electrical control signal of the control input of the switching element 25 permanently holds, as long as the control signal generator 27 actuated or switched. Such self-holding circuits with ausschaltender function are known and will not be described here.

In a particularly advantageous and inventive manner the execution of a mains isolation device 8th to 6 is the current flow limiter 35 in the form of a zero-crossing switch 31 formed because when connecting the power supply device 5 with the mains connection at the time of the voltage-free potential at the zero crossing of the sine wave-shaped AC voltage of the mains connection 30 no electricity flows. Only after the switching contacts of the switching element 25 are closed or turned on at the zero crossing, the input-side current flow of the power supply device follows when changing to the operating state of operation 5 the harmonic sine wave of the line-side AC voltage in the form of a resulting current waveform, which forms as harmonious and gradually grows. Thus, the zero crossing switch 31 as Stromflussbegrenzer 35 educated.

The 7 shows a further embodiment of a mains isolation device 8th essentially according to the embodiment of 5 , Again, a switching element 25 which is above its switching output with a Stromflußbegrenzer 35 is electrically connected in series and the power supply device 5 upstream. As shown 7 is the current flow limiter 35 as electrical resistance 35 educated. In another embodiment, not shown, the Stromflußbegrenzer 35 as NTC or as an association of a resistor with an NTC as described 5 be formed. In an electrical parallel circuit is the Stromflußbegrenzer 35 a second switching element 37 connected in parallel, which has a control input and wherein the connection of the control input to the output terminal of a timer 36 connected is. The timer 36 is as shown 7 designed as a time delay element. Will now be a button of manual control 7 actuated, the control signal generator switches 27 a switching signal to the control input of the switching element 25 as well as on the input terminal of the timer 36 , then changes the mains isolation device 8th in the operating mode operation and the switching element 25 then connects the power supply device 5 over the current flow limiter 35 with the mains connection 30 , At the time of switching to the operating state of operation thus flows to the power supply device 5 a through the Stromflußbegrenzer 35 limited power.

In general, it has been shown that the high inrush current of the power supply device 5 only for a short period of a few hundred milliseconds prevails. According to the 7 is a second switching element 37 provided, which offset in time and by the output of the timer 36 is switched. This is the output of the timer 36 electrically conductive with the control terminal of the second switching element 37 connected, wherein in response to the signal application, the switching contacts of the second switching element 37 close or turned on. According to the 7 is at least one of the output terminals of the second scarf element 37 with at least one connection of the current flow limiter 35 electrically connected.

According to the presentation of the 7 are the switching element 25 and the second switching element 37 as a relay or as a network relay 23 with relay contacts 24 , which form the switching output formed. In a manner not shown, the switching element 25 and / or the second switching element 37 also be designed as a semiconductor switch. A delayed and delayed connection of the second switching element 37 offers the advantage that even after a short time of switching to the operating state of operation, the full energy flow from the mains connection 30 to the power supply device 5 exists, while at the time of switching to the operating state of operation, the flow of current through the Stromflußbegrenzer 35 is limited. Contrary to the description and the representation after 7 is the second switching element 37 designed as a time delay switching element. For this purpose, in one embodiment, it may be an integrated one Have timer or have a switching character with a very high response time.

According to the representations of the 4 to 7 is the control signal generator 27 shown in a very simplified form, as well as the auxiliary voltage source 20 not shown in detail. However, this is the auxiliary voltage source 20 and the control signal generator 27 according to the above-mentioned description in a control circuit electrically connected such that at a key press the manual control 7 the control signal generator 27 or the aforementioned signal generator, which also serves as a control signal switch 27 is called, closes the control circuit and the auxiliary voltage source their electrical voltage according to the 4 to 7 to the control input and / or to the supply terminal of a switching element 25 . 37 and / or a timer 36 and / or a logic gate 32 and / or to a zero crossing switch 31 invests.

In a manner not shown, a push button in the form of a closer is still provided, whose connections parallel to the switching terminals or to the output terminals at least one switching element 25 . 37 are switched. This is manually operable on a shell of the power supply device not shown in detail 8th trained and arranged. Should by a longer storage or transport duration of the electromotive furniture drive 1 or the mains isolation device 8th the auxiliary voltage source 20 have no energy, so this manually operated key switch can be used advantageously as an auxiliary switch, as a result of an operation, the power supply device 5 with the mains connection 30 is formed connectable and the charging circuit of the auxiliary voltage source described above 20 recharge these.

In a further embodiment, not shown, the switching element 25 or the second switching element 37 together with the Stromflußbegrenzer 35 arranged in a common housing or taken together to form a structural unit.

LIST OF REFERENCE NUMBERS

1

Electromotive furniture drive

2

linear actuator

3

lifting tube

4

clevis

5

Power supply means

6

motor control

7

manual operation

8th

Mains cut-off device

9

input cable

9 '

power cable

10

input circuit

11

DC

12

rectification

13

switch module

14

The transformer unit

15

Secondary unit

16

optocoupler

17

control device

18

control supply

19

Galvanic separation

20

Auxiliary power source

21

Rectifier unit

22

control block

23

power relay

24

relay contacts

25

switching element

26

drive block

27

Control signal generator

30

mains connection

31

Zero crossing switch

32

logical link

33

second relay

34

second relay contacts

35

Stromflussbegrenzer

36

timer

37

second switching element

NTC

NTC thermistor

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102006049715 A1 [0004]

Claims (10)

Electromotive furniture drive ( 1 ) with a power supply device ( 5 ), a network release device ( 8th ) and a hand control ( 7 ) for adjusting movable furniture components relative to each other, wherein the electromotive furniture drive ( 1 ) has at least one direction of rotation reversible electric motor, wherein each electric motor is followed by a Drehzahlreduziergetriebe and wherein each Drehzahlreduziergetriebe another gear is connected downstream, and wherein the power supply device ( 5 ) has a network connection which is connected to the network by the network release device ( 8th ) is formed connectable, wherein the energy supply device ( 5 ) transforms the line-side input voltage into an output-side low voltage, and an isolation transformer or a transmission unit for galvanic isolation ( 19 ) between the network input side and the low voltage output side for operating the electromotive furniture drive ( 1 ), wherein the energy supply device ( 5 ) is designed in the manner of a switched-mode power supply and has an intermediate circuit ( 11 ), a control device ( 17 ) for controlling the switching power supply, and the control device ( 17 ) a network-connected control supply ( 18 ), wherein the energy supply device ( 5 ) has an operating state off in the case of disconnection from the mains and an operating state in regular operation, wherein the mains isolating device ( 8th ), the energy supply device ( 5 ) or the electromotive furniture drive ( 1 ) an auxiliary voltage source ( 20 ) characterized in that the network enabling device ( 8th ) a Stromflußbegrenzer and at least one switching element ( 25 . 37 ), and the switching element ( 25 . 37 ) has a control input and a switching output, wherein the control input is controlled by the Stromflußbegrenzer or wherein the switching output is connected in series with a Stromflußbegrenzer. Electromotive furniture drive ( 1 ) according to claim 1, characterized in that the at least one switching element ( 25 . 37 ) is in the de-energized state is open or is not turned on, and that the at least one switching element ( 25 . 37 ) is a relay or a semiconductor switch. Electromotive furniture drive ( 1 ) according to one or more of the preceding claims, characterized in that at least one resistor, preferably a thermistor resistance, in series with the at least one switching element ( 25 . 37 ) is switchable. Electromotive furniture drive ( 1 ) according to one or more of the preceding claims, characterized in that at least one throttle in series with the at least one switching element ( 25 . 37 ) is switchable. Electromotive furniture drive ( 1 ) according to one or more of the preceding claims, characterized in that the auxiliary voltage source ( 20 ) is designed as a network-connected or as a network-bound auxiliary voltage source. Electromotive furniture drive ( 1 ) according to one or more of the preceding claims, characterized in that the switching element ( 25 . 37 ) of the network release device ( 8th ) is formed by relay contacts, by semiconductor contacts or by semiconductor switches, wherein the semiconductor switch comprises a power transistor, a triac, a MOSFET or is formed by an electronic relay. Electromotive furniture drive ( 1 ) according to one or more of the preceding claims, characterized in that the switching element ( 25 . 37 ) of the network release device ( 8th ) has a control input with control input terminals, which with the auxiliary voltage source and with a signal generator ( 27 ) are connected to a control circuit. Electromotive furniture drive ( 1 ) according to one or more of the preceding claims, characterized in that the current flow limiter ( 35 ) with a control input of the switching element ( 25 . 37 ) of the network release device ( 8th ) is in active connection that the Stromflussbegrenzer ( 35 ) by a zero-voltage switch or as a zero-crossing switch ( 31 ), and in that the signal generator is connected directly to the output of the zero-crossing switch ( 31 ) is arranged. Electromotive furniture drive ( 1 ) according to one or more of the preceding claims, characterized in that between the output of the zero-crossing switch ( 31 ) and the control input of the switching element ( 25 . 37 ) of the network release device ( 8th ) Or logic gates are arranged. Electromotive furniture drive ( 1 ) according to one or more of the preceding claims, characterized in that the mains-independent auxiliary voltage source ( 20 ) is provided with a charging circuit, which is designed to be connected to the network for a limited time.

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