DE202010005413U1 - Electromotive furniture drive with a mains isolation device and corresponding mains isolation device - Google Patents

Abstract

Electromotive furniture drive (1) with an energy supply device (5), a mains isolation device (8) and a manual control (7) for adjusting movable furniture components relative to one another, the electromotive furniture drive (1) having at least one reversible electric motor, each electric motor being followed by a speed reduction gear and each speed reducer is followed by a further gear, and the energy supply device (5) has a mains connection which can be connected to the mains by the mains disconnection device (8), the energy supply device (5) transforming the mains-side input voltage into an output-side low voltage , and an isolating transformer or a transmission unit for electrical isolation (19) between the mains-connected input side and the low-voltage output side for operating the electromotive M loaded drive (1), wherein the mains cut-off means (8) comprises an auxiliary voltage source (10) and at least one switching element, characterized in that the auxiliary voltage source (10) of the mains cut-off device (8) a miniature switching power supply.

Description

The invention relates to an electromotive furniture drive with a mains isolation device for adjusting movable furniture components relative to each other. The invention also relates to a corresponding mains isolation device.

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 the operation of electromotive furniture drives, transformers with rectification and screening have proven to be the best way of supplying energy. The power supply device has an operating state Off when disconnected from the mains and an operating state in normal operation.

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 contacts of the controlled switch changing to a closed state, the power supply being supplied 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.

In the course of the ever-increasing demands for energy-saving measures and devices with low energy consumption in the idle or standby state, it is required that a stand-by operation should not consume more than 0.5W.

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

The object is achieved in an electromotive furniture drive with a power supply device having the features of claim 1 and by a mains isolation device with the features of claim 8.

Advantageously, the mains isolation device is provided with a switching power supply as an auxiliary voltage source, which meets the requirements for low power consumption in stand-by mode.

An electromotive furniture drive according to the invention with a power supply device, a mains isolation device and a hand control for adjusting movable furniture components relative to each other, the electromotive furniture drive having at least one reversible electric motor, each electric motor is followed by a Drehzahlreduziergetriebe and each Drehzahlreduziergetriebe another gear is connected downstream, and the power supply device has a network connection, which is connectable to the network by the mains isolation device, wherein the power supply device transforms the line side input voltage into an output side low voltage, and an isolation 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 mains isolation device has an auxiliary voltage source and at least one switching element, characterized in that the auxiliary voltage source of the mains isolation device is a miniature switching power supply.

Thus, it is easily achieved that the stand-by consumption of Mains release device is below the required value of 0.5 W, in particular less than 30 mW.

Another advantage is that the miniature switching power supply has a wide-range input for mains voltages of about 90 V to 264 V. Also, the frequency range for these AC voltages from 47 Hz to 63 Hz is designed worldwide. This is a saving of previously different versions of mains disconnections for different country-specific supply voltages by only one version possible.

The at least one switching element of the mains isolation device may be a network relay with at least one relay contact. This is preferably open in the de-energized state of the power relay. This prevents that the mains voltage is switched on in the absence of energization of the network relay.

Alternatively, the at least one switching element may be a semiconductor switch or an optocoupler.

The at least one switching element has a control input for the controlled switching of the switching element. This control input is connected to the switch contacts of a push-button of a manual operation or a pedal operation, which is operated by muscular force of an operator. Other switching elements have a control input, which are connected to an output of a bus device, a radio receiver or an infrared receiver. Such muscle-force actuable push-button or such outputs can also be referred to as a signal generator or as a control signal generator, as will be explained below.

In another embodiment, the control input of the switching element is connected directly to the output of the miniature switching power supply. In this case, the miniature switched-mode power supply has an intermediate circuit or a control circuit with which the switching contacts of the muscle-force-actuable push-button switch, which can also be referred to as control signal transmitters, are connected. The intermediate circuit or the control circuit is integrated in the miniature switching power supply and can switch between different operating states, for example, the operating conditions mentioned above, the miniature switching power supply. In the non-actuated state of the respective key switch, the electromotive furniture drive is in the idle state, wherein the DC link or the control circuit of the miniature switched-mode power supply is set Enabled in an operating state, so that the miniature switched-mode power supply at its voltage output no voltage or voltage is almost no voltage.

In a further embodiment, the mains isolation device can have a supply connection with DC voltage for supplying functional groups. This is particularly advantageous since this supply connection is also available without switching on the mains isolation device.

In yet another embodiment, the mains isolation device may include a motor controller having at least two motor relays. This is particularly advantageous for single-engine furniture drives, as this allows the furniture drive can be made very slim. In addition, no control housing is necessary.

In this case, the mains isolation device can be designed for wired connection for manual operation and / or for wireless communication with the manual operation. Thus, a motor controller for a single drive can be integrated.

A mains isolation device for an electromotive furniture drive is formed with a housing, a power plug, at least one connection for the electromotive furniture drive and a connector for a signal generator. It is therefore particularly suitable for retrofitting.

The connection for the signal transmitter can be wired or wireless as a radio and / or infrared receiver. Thus, the mains isolation device can also be used for other devices with appropriate control.

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; and

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

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 for example as a switching power supply or transformer with rectification and screening. 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 the mains isolation device 8th to 1 ,

The mains isolation device 8th includes an auxiliary power source 10 and a switching element, here as a network relay 11 with relay contacts 12 is trained.

The auxiliary voltage source 10 is designed here as a switching power supply, with its input to a network connection 20 , for example mains plug or terminal block, is connected. Preferably, the element is denoted by the reference numeral 10 a miniature version of the switching power supply. A plus pole + the secondary voltage, which is also called auxiliary DC voltage, is connected to a connection of the network relay 11 connected. The other minus line - the auxiliary DC voltage leads to a control signal generator 13 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 13 has the function when operating the manual control 7 to close a closing contact and thus the other line of the auxiliary DC voltage to the other terminal network relay 11 connect to.

The network relay 11 here has two relay contacts 12 as a make contact, each of which is in a line from the mains connection 20 is arranged. The one relay contact (here the right one) is connected to a line of the input cable 9 connected, with the other relay contact with the other line of the input cable 9 connected is.

• – Stand-By-Kreise
• – Prozessoren
• – Funk- und/oder Infrarotempfänger
• – Auswerte- und Überwachungskreise, welche mit Hallsensoren in Verbindung stehen
• – Einklemmschutz
• – Patientenüberwachungssysteme
• – Leselampen bis ca. 10 W oder Nachtlicht
• – Versorgung eines gesamten Steuerkreises der Motorsteuerung 6, d. h. der Spulen der Motorrelais und dergleichen

Furthermore, the plus line and the minus line of the auxiliary direct voltage are to a supply terminal 14 led, which for example in the engine control 6 or the power supply unit 5 associated with different functional groups. These functional groups may be, for example, the following:

• - Stand-by circles
• - processors
• - Radio and / or infrared receiver
• - Evaluation and monitoring circuits, which are associated with Hall sensors
• - Anti-trap
• - Patient monitoring systems
• - Reading lamps up to 10 W or night light
• - Supply of an entire control circuit of the engine control 6 ie the coils of the motor relays and the like

How it works:

When operating the manual control 7 becomes the control signal generator 13 closed and connects the minus line of the auxiliary DC voltage to the other terminal of the network relay 11 , The network relay 11 is thus applied to the auxiliary DC voltage. The mains relay pulls 11 and closes the relay contacts 12 , The one contact 12 connects a power line to the one line of the input cable 9 , The other contact 12 Switches the other power line to the other line of the input cable 9 ,

The auxiliary voltage source 10 as a miniature switching power supply has a wide-range input for all world voltages and frequencies. Thus, the mains isolation device 8th usable everywhere.

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

For example, the mains isolation device 8th be a separate part, which can be retrofitted. It can also have a housing with a socket in which a connection for the signal generator 13 or in which a terminal for the power supply device 5 is integrated.

It may also be a radio and / or infrared receiver for controlling the mains isolation device 8th be provided in this case.

The network relay may also consist of at least one semiconductor switch.

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

Auxiliary power source

11

power relay

12

relay contacts

13

Control signal generator

14

supply terminal

20

mains connection

Claims (9)

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 network release device ( 8th ) an auxiliary voltage source ( 10 ) and at least one switching element, characterized in that the auxiliary voltage source ( 10 ) of the network release device ( 8th ) is a miniature switching power supply. Electromotive furniture drive ( 1 ) according to claim 1, characterized in that the at least one switching element is a network relay ( 11 ) with at least one relay contact ( 12 ). Electromotive furniture drive ( 1 ) according to claim 2, characterized in that the at least one relay contact ( 12 ) in the de-energized state of the network relay ( 11 ) is open. Electromotive furniture drive ( 1 ) according to claim 1, characterized in that the at least one switching element is a semiconductor switch. Electromotive furniture drive ( 1 ) according to one or more of the preceding claims, characterized in that the mains isolation device ( 8th ) a supply connection ( 14 ) with DC voltage for the supply of functional groups. Electromotive furniture drive ( 1 ) according to one or more of the preceding claims, characterized in that the mains isolation device ( 8th ) an engine control ( 6 ) having at least two motor relays. Electromotive furniture drive ( 1 ) according to claim 6, characterized in that the mains isolation device ( 8th ) to the wired connection for manual operation ( 7 ) and / or for wireless communication with the manual override ( 7 ) is trained. Mains release device ( 8th ) for an electromotive furniture drive ( 1 ) with a housing, a mains plug, at least one connection for the electromotive furniture drive ( 1 ) and a connector for a signal generator ( 13 ). Mains release device ( 8th ) according to claim 8, characterized in that the connection for the signal transmitter ( 13 ) is formed wired or wireless as a radio and / or infrared receiver.

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