WO2008077898A1

WO2008077898A1 - Controller for electrically adjustable furniture

Info

Publication number: WO2008077898A1
Application number: PCT/EP2007/064374
Authority: WO
Inventors: Stefan Lukas; Mario Schenk; Walter Koch
Original assignee: Logicdata Electronic & Software Entwicklungs Gmbh
Priority date: 2006-12-22
Filing date: 2007-12-20
Publication date: 2008-07-03
Also published as: EP2102979A1; DE102006061163A1

Abstract

A controller for electrically adjustable furniture comprises a supply device (10), which is coupled to system terminals (12) via a system isolating relay (13) and is used for producing a voltage present at supply terminals (11). The system isolating relay (13) is driven by a detection device (130) as a function of an operating state of the controller. The voltage present at the supply terminals (11) can be emitted at a motor terminal (20) as a function of a control signal (MS1). In addition, the controller comprises a control device (30), which has an operating terminal (32) and a control output (31) for emitting the control signal (MS1). An operating device (40) is connected to the operating terminal (32).

Description

description

Control for electrically adjustable furniture

The invention relates to a control for electrically adjustable furniture and a use of the controller

At present, many tables are offered, especially desks with tabletops, in which the height of the tabletop is adjustable via a special drive. Even beds, such as comfort beds or hospital beds, can be adjusted by electrical drives approximately in height or tilt angle of the bed.

It is possible to use DC motors for the drive, which are operated with a low voltage or low voltage of about 12 V to 24 V. For this purpose, the mains voltage, usually in Europe at about 230 V lying, reduced via a transformer in the lower voltage range of the DC motors and converted via a rectifier circuit into a DC voltage. The motors can be controlled by a controlled connection of the motors with the low DC voltage. For this purpose, a coupled with controls control board can be used, which can be constructed, for example, together with the transformer and the rectifier circuit.

Another possibility for a drive with electrically adjustable furniture is the use of AC motors, which can be operated with the mains AC voltage. In all cases care should be taken when using mains voltages that a user of an electrical can not come into contact with current-carrying contacts.

It is an object of the invention to provide a controller for electrically adjustable furniture that can be produced inexpensively and with little effort and ensures electrical safety for a user. It is a further object of the invention to provide a use for the controller.

These objects are achieved with the subject matters of the independent claims. Embodiments and developments of the invention are the subject of the dependent claims.

In an exemplary embodiment of the invention, a control for electrically adjustable furniture comprises a supply device for generating a voltage applied to supply terminals voltage from an AC line voltage. The supply device is coupled via a power disconnect relay with power connections. At a first motor terminal, the voltage applied to the supply terminals can be delivered as a function of a first control signal. A first control device has an operating connection and a first control output for outputting the first control signal. An operating device is connected to the operating connection of the first control device. A control of the

Mains isolation relay takes place as a function of an operating state of the controller by a detection device which detects the operating state.

The detection device can detect potentially dangerous operating states of the control. Depending on such a detection, the control can be powered off or disconnected from the mains via the power disconnect relay turn. This prevents the user with the higher voltage in the mains voltage range, which results in Europe, for example, from the approximately 230 volts and in North America from the approximately 115 volts of the respective mains AC voltage comes into contact and thus experiences an electric shock.

In each of various embodiments, the controller may be used to drive DC motors or AC motors.

In an exemplary embodiment, as an additional protective measure, by separating the controller into a mains voltage range and a low voltage range, it is possible to operate the operating device, which is accessible, for example, to a human user, with a voltage that is harmless to humans, which ranges from a few a few volts. At the same time, in another exemplary embodiment, the provision of a DC voltage at the supply terminals of the supply device enables precise control of a voltage delivered to a DC motor. In addition, it is possible to dispense with the use of a transformer designed for high power, since the supply device directly converts the AC mains voltage provided by an AC power supply network into the DC voltage.

In various embodiments of the invention, provision is made for a supply device which has a rectifying function, for example conventional rectifiers with rectifier diodes or controlled transistor bridges. - A -

For example, in other embodiments of the invention, additional sensors are provided for sensing various conditions of a motor connected to the engine port, such as a motor current or an engine speed. This allows even more precise control or regulation of the connected motor.

The controller can also provide additional motor connections for other motors that can be controlled or controlled independently via the control unit.

In further embodiments, different operating states are detected by the detection device. By way of example, it is detected whether a motor is currently in operation or whether a motor is connected to the motor terminal in order to safely disconnect the mains voltage range when a motor is not in use or absent. Likewise, the detection device makes it possible to ascertain whether fault currents occur in the control or in a motor connected to a motor connection, that is to say flows that do not flow in an intended manner, which could endanger the user of the control system. In this case, the mains voltage range is again switched off.

A controller according to one of the embodiments can be used for example in an electrically height-adjustable table, such as a desk or a workbench. Furthermore, an embodiment of a control can also be used with electrically adjustable beds, such as

Example with comfort beds or beds in the hospital or care area. The invention will be explained in more detail below with reference to several embodiments with reference to FIGS. Functionally or functionally identical elements bear the same reference numerals.

Show it:

1 shows a first embodiment of a controller,

FIGS. 2A to 2D show different embodiments of details of a controller;

FIG. 3 shows a first exemplary embodiment of a detection device,

FIG. 4 shows a second embodiment of a detection device,

FIG. 5 shows a third exemplary embodiment of a detection device,

Figure 6 shows a second embodiment of a controller and

Figure 7 shows a third embodiment of a controller.

Figure 1 shows an exemplary embodiment of a control for electrically adjustable furniture. In this case, a supply device 10 is provided, which is coupled on the input side via a power disconnect relay 13 with power terminals 12. A motor terminal 20 is connected to supply terminals 11 of the supply device 10. A first control device 30 has a first control output 31 via which a first control signal MS1 can be delivered to the supply device 10. An electric motor 60 is connected to the motor connection 20. An operating device 40 is coupled to an operating terminal 32 of the control device 30.

The operating device 40 has a first sensor 41, via which a user can transmit control commands. The first sensor 41 is designed in this embodiment as a simple switch or pushbutton, but can be replaced by other sensors, without departing from the scope of the invention.

Via the network connections 12, the control or the supply device 10 is supplied with an alternating mains voltage, for example from a conventional alternating voltage supply network.

The first control device 30 is set up to generate a first control signal MS1 for controlling the supply device as a function of signals at the operating connection 32, which are transmitted by the operating device 40.

To control the power disconnect relay 13, a detection device 130 is provided, which detects an operating state of the control. For this purpose, the detection device 130 is coupled, for example, to a control connection 37 of the first control device 30. For example, it can be detected whether the motor 60 is in operation, that is, whether a current flow via the supply terminals 11 is necessary. For example, the control or the supply Supply device 10 thus be disconnected from the power connections 12 at standstill of the motors. The controller shown thus offers protection of a user from a dangerous voltage.

Figure 2A shows an embodiment of a detail of a controller. In this case, the supply device 10 comprises a transformer which is connected on the input side to the power disconnect relay 13. The output of the transformer is coupled via switches 23 to the supply terminals 11. Depending on a switching state of the switch 23, which is controlled by the first control signal MSl, a transformed voltage can be delivered to the supply terminals 11. In another embodiment, the transformer can also be omitted. For example, a motor connection 20 for connecting an AC motor can be connected to the supply connections 11.

Figure 2B shows another embodiment of a detail of a controller. In this case, the supply device 10 comprises four diodes D connected for full-wave rectification and a smoothing capacitor C. The supply device 10 is coupled on the input side to the mains disconnect relay 13. A motor terminal 20, to which, for example, a DC motor can be connected, is connected to one pole directly and to the other pole via a transistor 23 to the supply terminals 11. The negative pole of the supply terminals 11 is connected to a reference potential terminal GND.

About the power disconnect relay 13 of the controller or the supply device 10 is an AC line voltage, for example, from a conventional AC voltage supply network. By the supply device 10, the AC line voltage is converted into a rectified and smoothed DC voltage and provided to the supply terminals 11. The full-wave rectification, which is embodied here as a bridge rectifier, can also be replaced by other rectifier circuits, for example, center rectifier or low-consumption half-wave rectifier.

The first control device 30 is set up to generate a first control signal MS1 for controlling the supply device 10. For example, the control device 30 generates a pulse-width-modulated signal, which opens the transistor 23 periodically. As a result, a DC voltage is applied to the motor connection 20 as a function of time, which depends on the DC voltage provided at the supply terminals 11 and the duty cycle of the pulse-width-modulated control signal MS1. This leads to a rotation of the motor or a movement of the drive for an electrically adjustable piece of furniture.

In this embodiment, can be dispensed with a designed for high power transformer for powering the motor.

FIG. 2C shows a further exemplary embodiment of a detail of a controller in which the supply device 10 comprises a transistor bridge with transistors T1, T2, T3, T4. A first path with the transistors Tl, T3 and a second path with the transistors T2, T4 are connected between terminals to the power disconnect relay 13 for supplying the AC line voltage. The control terminals of the transistors T1, T2, T3, T4 are connected to a first control output 31 of the first control unit. coupling device 30 coupled. Connection nodes of each two series-connected transistors Tl, T2, T3, T4 form the supply terminals 11 of the rectified voltage. Furthermore, the supply device 10 includes an AC voltage sensor 14, which is coupled to an AC voltage sensor input 38 of the first control device 30.

By a mutual control of the transistors Tl, T2 and the transistors T3, T4, the AC line voltage is output as a rectified, unipolar voltage to the supply terminals 11 and the motor terminal 20. In order to make this synchronous to the phase position of the mains AC voltage, the phase position can be detected via the AC voltage sensor 14. For example, the transistors Tl, T2 are driven during a positive half cycle and the transistors T3, T4 during a negative half cycle. In order to change the polarity of the voltage at the motor terminal 20 and thus the direction of rotation of the motor, the drive is reversed, so that the transistors T3, T4 are driven during a positive half cycle and the transistors Tl, T2 during a negative half cycle. A current path for the current via the motor terminal 20 is thus formed alternately by the transistors Tl, T2 and the transistors T3, T4.

The activation can also be carried out only during a section of a half-wave in order to set the effective voltage at the motor connection.

In one embodiment of the embodiment, a smoothing capacitor C is connected between the supply terminals 11. Figure 2D shows another embodiment of a detail of a controller. In this case, a transistor bridge with transistors 231, 232, 233, 234 is provided which has two paths connected to the supply terminals 11, each having two series-connected transistors 231, 232, 233, 234. The control terminals of the transistors 231, 232, 233, 234 are coupled to the first control output 31. The connection nodes of the two transistors 231, 232 and 233, 234 connected in series form the first motor connection 20.

By a simultaneous activation of the transistors 231, 234 or the transistors 232, 233, the DC voltage of the supply device 10 is delivered to the motor connection 20. In order to change the polarity of the voltage at the motor terminal 20 and thus the direction of rotation of the motor, the drive is reversed, so that either the transistors 231, 234 or the transistors 232, 233 are driven. A current path for the current through the motor connection

20 is thus alternatively formed by the transistors 231, 234 or the transistors 232, 233. As in the exemplary embodiment according to FIG. 2B, a pulse-width-modulated signal can be used as the control signal MS1, which is in each case alternatively supplied to the transistors 231, 234 or the transistors 232, 233.

FIG. 3 shows an exemplary embodiment of a detection device in a controller for electrically adjustable motors. In this case, the supply device 10 is coupled via the power disconnect relay 13 and a Netzentstördrossel 15 to the power terminals 12. The network suppression choke 15 is used, for example, for filtering high-frequency interference. At the Mains suppression choke 15, an additional winding is provided as a fault current coil L15, which is coupled to a fault current circuit 150. The detection device 130 for controlling the power disconnect relay 13 has a connection 134 coupled to the fault current circuit 150. Furthermore, connections 131, 132 are provided, via which the detection device 130 can be coupled to the first control device 30 and the operating device 40. Thus, the detection device 130 can also obtain information about the operating state of the controller from the first control device 30 and the operating device 40 in order to switch the power disconnect relay 13 as a function thereof.

Mains suppression chokes usually have the property of keeping the magnetic flux in the core at 0 for the same incoming and outgoing current. If a current flows through the protective conductor in the electronics or via the motors, that is to say an unintended or unauthorized current occurs which can endanger a user, then asymmetrical magnetic fluxes are generated in the network suppression choke 15. In the case of an asymmetrical current flow and the resulting magnetic flux which is not equal to 0, a voltage is thus induced in the fault current coil L15 which is picked up by the fault current circuit 150. For example, if the thus induced

Voltage exceeds a certain value, the detection device 130, the occurrence of a fault current in the controller or in a motor can be signaled. Thereupon, the detection device 130 can cause an opening of the power disconnect relay 13 for the power disconnection of the mains voltage range 1. The information about a fault current case can also be sent to the first control device 30 to prevent such a quick restart.

The fault current coil L15 can alternatively also be connected directly to the detection device 130.

Figure 4 shows another embodiment of a detection device in a control for electrically adjustable furniture. As an alternative to the embodiment shown in FIG. 3, fault current resistors R15 are connected in series with the windings of the network suppression choke 15 via which a normally low voltage drops as a function of the current flowing through. The residual current resistors R15 are coupled to the fault current circuit 150 for supplying this voltage dropping across them. In regular operation of the controller, the resistors R15 are flown through with the same current. If, however, fault currents should flow off in the event of a fault, the current flow through the resistors R15 and thus the voltage drop will be different, which in turn can be detected by the fault current circuit 150. The fault current circuit 150 preferably comprises a device for comparing the voltage drops and for generating information in the event of a fault. Depending on this information, the detection device 130 can drive the network disconnection relay 13.

FIG. 5 shows a further embodiment of a detection device in a control for electrically adjustable furniture. In this embodiment, the detection device 130 is set up to detect whether a motor 60 is connected to the controller. For example, the connection of the motor 60 takes place via a plug connection 600, which establishes an electrical connection with the motor Final 20 manufactures. Further, ports 200 are provided on the part of the controller, which are bridged when the motor 60 is plugged. For example, in the connector 600, a metal bracket 610 is provided which connects the terminals 200 electrically when the connector 600 is plugged. Alternatively, the bridging of the terminals 200 can also take place in a cable connected to the plug connection 600, which leads from the motor connection 20 to the motor 60. In other words, the absence of a motor can be detected, for example, even if the connector 600 is plugged in and the cable to the motor 60 is damaged or severed.

When electrically connected plug contacts 200 are detected by the detection device 130, which is coupled via connections 135 to the plug contacts 200, the mains disconnect relay 13 can remain closed. However, if the plug contacts 200 are unconnected, it is assumed that no motor is connected and the mains voltage range can be switched off via the power disconnect relay 13.

FIG. 6 shows a further embodiment of a controller. The supply device 10, the power disconnect relay 13, the first motor terminal 20 and the first control device 30 are arranged in a mains voltage range 1, which is designed for example for voltages in the range of about 100 to 400 volts.

The operating device 40, which is arranged in a low-voltage area 2, is connected to the operating terminal 32 of the control device 30 via a galvanically separating coupling 50. In addition to the first motor terminal 20, a second motor terminal 20a is provided in the mains voltage range 1, which serves to supply power to a second motor 61. Analogously to the first motor terminal 20, the second motor terminal 20a is coupled to the supply terminals 11 via a transistor 23a. Furthermore, in the current paths of the motors 60, 61 current sensors 21, 21 a are connected, which are designed here as special resistors for current measurement, which are also referred to as a shunt. The first current sensor 21 or the second current sensor 21a are configured to measure a motor current via the first motor connection 20 or via the second motor connection 20a and via a measuring line to a first or second current sensor connection 33, 33a of the first control device 30.

The information about the motor currents can also be forwarded to the detection device 130. For example, the mains voltage range 1 can be disconnected from the power disconnect relay 13 when no motor currents flow, that is, when none of the motors 60, 61 moves.

The first control device has an analog / digital converter 35 for converting the analog signals of the current sensors 21, 21a into digital signals.

The second transistor 23a is coupled to a second control output 31a of the first control device 30. At the second control output 31a, a second control signal MS2 for controlling the transistor 23a is emitted in the same way as in the first control output 31, which may differ from the first control signal MS1. Instead of the transistors 23, 23a, other controllable switching elements can be used.

Furthermore, a first and a second rotational speed sensor 22, 22 a are provided which are set up for measuring a rotational speed of the motors 60, 61 connected to the motor terminals 20, 20 a. The speed sensors 22, 22a each have a Hall sensor in this embodiment. However, it is also possible to provide further Hall sensors for the rotational speed sensors 22, 22a, which are used, for example, for determining the direction of rotation.

The information or signals of the rotational speed sensors 22, 22a or Hall sensors can be evaluated by the detection device 130. For example, a current through the

Hall sensors are measured. If too low a current is measured, it can be assumed that no motor is connected or the connection to the Hall sensors and to the motor is disconnected. In this case, the mains voltage range 1 can be switched off by the detection device 130. The detection device 130 in turn is controlled by the first control device 30, which evaluates the signals of the Hall sensors.

Through the return of information about the by the

Motors 60, 61 flowing currents and the speeds of the motors 60, 61, a control loop can be formed, which allows an exact control of the movement of the drives. Thus, for example, the drive of motors that are theoretically the same design but production-related slight deviations have controlled synchronized. Likewise, different movements can be compensate for deflections due to different mechanical loads of the motors.

In addition, a first and a second switching device 24, 24a are provided for changing a polarity of the DC voltage which can be output at the first and second motor connection 20, 20a, which are each coupled to a first or second polarity output 36, 36a of the first control device 30. In this case, the switching devices 24, 24a each comprise switches 241, 242 and 241a, 242a which can each be switched together and thus can influence a voltage or current direction through the motors 60, 61. This makes it possible, for example, to set the direction of rotation of the motors 60, 61.

In the exemplary embodiment shown, a voltage supply device 70 is also provided for supplying the operating device 40 with a rectified low voltage. In this case, the voltage supply device 70 comprises a transformer 71, which converts the mains alternating voltage into a

Low voltage, which is required for the operation of the operating device, converts, and a rectifier 72. The transformer 71 has to transmit only a small power and is therefore small and inexpensive. The voltage supply device 70 can also be provided for supplying power to the first control device 30. In this case, the transformer 71 can be set up for the electrically separate delivery of a first and a second low voltage, whereby the galvanic separation of the mains voltage region 1 and the extra-low voltage region 2 is ensured. The

Power supply device 70 is in the embodiment before the power disconnect relay 13 to the power terminals 12 closed to allow power supply to the controller even when the power disconnect relay 13 is open.

Both the operating device 40 and the first control device 30 can also be supplied with an operating voltage via other supply sources, for example via batteries, rechargeable batteries or other supply sources independent of the mains alternating voltage. Similarly, switching power supplies can be used for supply.

The operating device 40 comprises, in addition to the first sensor 41 designed as a push-button, a second push-button 42. The switching states of the push-buttons 41, 42 are transmitted to the operating connection 32 of the first control device 30 via optocouplers 51, 52 of the galvanically separating coupling 50.

The galvanically separating coupling 50 can also be designed, for example, as an infrared connection or radio connection. The galvanically separating coupling 50 is arranged in the illustrated embodiment at a point between mains voltage range 1 and low voltage range 2. However, it can also be provided in the mains voltage range 1. It should only be ensured that the extra-low voltage range 2 does not come into galvanic contact with the higher voltages of the mains voltage range 1.

The generation of the control signals MS1, MS2 takes place in the control device 30, which is embodied for example as a microcontroller. The operating device 40 is used in this exemplary embodiment only for the transmission of tactile commands of the user. FIG. 7 shows an alternative exemplary embodiment of a controller, in which the supply device 10 is coupled via a network separation relay 13 to the mains connections 12 for supplying the mains alternating voltage. A control of the power disconnect relay 13 via the detection device

130. The detection device 130 has a first input 131 for supplying a control signal for closing the relay 13 and a second input 132 for supplying a control signal for opening the relay 13. The second input 132 is coupled to the control terminal 37 of the control device 30, so that a power-off of the mains voltage range 1 by the first control device 30 can take place. The first input 131 is coupled to the output of an OR gate 45 of the operating device 40, to which the input side, the buttons 41, 42 are connected. Thus, the power disconnect relay 13 can be controlled by an OR circuit of signals of the buttons 41, 42 and turn on the power supply for the mains voltage range 1.

In addition to the possibilities shown in the embodiments to control one or two motors, other motors can be controlled with a controller. For example, if the motors are mounted to a table with four legs each on a height-adjustable table leg, the four motors required, for example, can be controlled simultaneously via the control. Advantageously, a feedback of engine data takes place, for example via respective rotational speed sensors and / or current sensors. This in turn allows a synchronous control of the motors and thus a uniform lifting of the table.

When using the control with electrically adjustable beds, it is possible to or to control setting options of the bed via different motors. Also, it is possible that several motors or a group of motors are controlled simultaneously.

LIST OF REFERENCE NUMBERS

1: mains voltage range

2: low voltage range

10: Supply device

11: Supply connections

12: Power connections

13: Mains isolation relay

14: AC voltage sensor

15: Mains suppression choke

20, 20a: Motor connection

21, 21a: current sensor

22, 22a: Speed sensor

23, 23a: transistor

200: plug contact

600: plug connection

610: Bridging

231, 232, 233, 234: transistor

T1, T2, T3, T4: transistor

24, 24a: switching device

241, 242: switch

242a, 242a: switch

30, 43: Control device

31, 31a: control output

32: Operating connection

33, 33a: current sensor connection

34, 34a: speed sensor connection

35: analog / digital converter

36, 36a: polarity output

37: Tax connection

38: AC voltage sensor input

40: Operating device

41, 42: sensor 44, 44a: Speed sensor connection

45: Or gate

50: coupling

51, 52, 53: optocouplers 60, 61: motor

70: Power supply device

71: Transformer

72: Rectifier

130: Detection device 131, 132, 133: Connection detection device

134, 135: Connection detection device

150: Residual current circuit

L15: Residual current coil

R15: Residual current resistance C: smoothing capacitor

D: rectifier diode

MSl, MS2: control signal

Claims

claims

A control for electrically adjustable furniture, comprising - a supply device (10) for generating a

Supply terminals (11) applied voltage from a mains AC voltage; a power disconnect relay (13) coupling the power supply (10) to power terminals (12); - A first motor terminal (20), on which in response to a first control signal (MSl), the voltage applied to the supply terminals (11) can be delivered; a first control device (30) having an operating terminal (32) and a first control output (31) for outputting the first control signal (MS1); a detection device (130) for controlling the power disconnect relay (13) in dependence on an operating state of the controller; and an operating device (40) which is connected to the operating terminal (32) of the first control device (30).

2. Control according to claim 1, wherein the detection device (130, 600) is coupled to the first motor terminal (20).

3. Control according to claim 1 or 2, wherein the detection means (130, 150) is adapted to detect a fault current and to control the power disconnect relay (13) in dependence of the detected fault current.

4. Control according to one of claims 1 to 3, wherein a first speed sensor (22) is provided which is adapted to measure a rotational speed of the first motor connection (20) connected to the motor (60).

5. Control according to claim 4, wherein the first speed sensor (22) has at least one Hall sensor.

6. Control according to claim 4 or 5, wherein the detection means (130) is adapted to detect a signal by the speed sensor (22) and to control the power disconnect relay (13) in response to the detected signal.

7. Control according to one of claims 1 to 6, wherein the power disconnect relay (13) by the first control device (30) and / or the operating device (40) is controllable.

A controller according to any one of claims 1 to 7, wherein there is provided a first current sensor (21) arranged to measure a motor current through the first motor terminal (20) and coupled to a first current sensor terminal (33) of the first controller (30) is.

9. Control according to claim 8, wherein the first control device (30) comprises an analog-to-digital converter (35) for converting a signal of the first current sensor (21).

10. Control according to one of claims 1 to 9, wherein a voltage supply device (70) for supplying supply of the first control device (30) and / or the operating device (40) is provided with a rectified low voltage.

11. Control according to one of claims 1 to 10, wherein the first control means (30) is adapted to deliver the first control signal (MSl) as a pulse width modulated signal.

12. Control according to one of claims 1 to 11, wherein a second motor terminal (20a) is provided which can be coupled in response to a second control signal (MS2) with the supply terminals (11), and the first control device (30) has a second control output (31a) for outputting the second control signal (MS2).

13. Control according to one of claims 1 to 12, in which a mains voltage range (1) and a low voltage range (2) are provided, which are galvanically isolated, wherein the supply device (10), the power disconnect relay (13), the motor connection ( 20) and the control device (30) in the mains voltage range (1) and the operating device (40) in the low voltage region (2) are arranged.

14. Control according to one of claims 1 to 13, wherein for supplying the first motor terminal (20) with the voltage applied to the supply terminals (11) voltage, a transistor (23) is provided whose control terminal is coupled to the first control output (31) ,

15. Control according to one of claims 1 to 14, wherein a first switching device (24) for changing a

Polarity of the voltage which can be emitted at the first motor connection (20) is provided, which is coupled to a first polarity output (36) of the first control device (30).

16. Control according to one of claims 1 to 13, wherein the supply device (10) is designed to generate a rectified voltage and in which a first transistor bridge (231, 232, 233, 234) is provided, the two to the supply terminals (11 ) connected paths each having two series-connected transistors (231, 232, 233, 234) whose control terminals are coupled to the first control output (31), wherein connection nodes of the two series-connected transistors (231, 232, 233, 234 ) are connected to the first motor terminal (20).

17. Control according to one of claims 1 to 13, in which the supply device (10) comprises a second transistor bridge (T1, T2, T3, T4), the two to the power disconnect relay (13) connected paths with two series-connected transistors ( Tl, T2, T3, T4) whose control terminals are coupled to the first control output (31), wherein connection nodes of the two series-connected transistors (Tl, T2, T3, T4) form the supply terminals (11).

18. The controller according to claim 17, wherein the supply device (10) comprises an AC voltage sensor (14) which is coupled to an AC voltage sensor input (38) of the first control device (30) for determining a phase position of the mains AC voltage.

19. Use of a controller according to one of claims 1 to 18 in an electrically height-adjustable table.

20. Use of a controller according to any one of claims 1 to 18 in an electrically adjustable bed.