Classifications

• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
  • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
  • H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
  • H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
  • H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
  • A47B13/00—Details of tables or desks
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47B—TABLES; DESKS; OFFICE FURNITURE; CABINETS; DRAWERS; GENERAL DETAILS OF FURNITURE
  • A47B96/00—Details of cabinets, racks or shelf units not covered by a single one of groups A47B43/00 - A47B95/00; General details of furniture
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47C—CHAIRS; SOFAS; BEDS
  • A47C1/00—Chairs adapted for special purposes
  • A47C1/02—Reclining or easy chairs
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47C—CHAIRS; SOFAS; BEDS
  • A47C17/00—Sofas; Couches; Beds
  • A47C17/86—Parts or details for beds, sofas or couches only not fully covered in a single one of the sub-groups A47C17/02, A47C17/04, A47C17/38, A47C17/52, A47C17/64, or A47C17/84; Drawers in or under beds
• • A—HUMAN NECESSITIES
  • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
  • A47C—CHAIRS; SOFAS; BEDS
  • A47C20/00—Head -, foot -, or like rests for beds, sofas or the like
  • A47C20/04—Head -, foot -, or like rests for beds, sofas or the like with adjustable inclination
  • A47C20/041—Head -, foot -, or like rests for beds, sofas or the like with adjustable inclination by electric motors
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
  • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
  • H02H3/12—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to underload or no-load

Definitions

• the invention relates to an electromotive furniture drive with a power supply device for adjusting movable furniture components relative to each other.
• Such electromotive furniture drives are known in different embodiments. They are linear actuators with a linear adjustable
• the linear drives have one or a number of electric motors, each motor being followed by a speed reduction gear and a further gear following the speed reduction gear, for example in the form of a threaded spindle gear, which generates a linear movement of the output 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 is connected to 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.
• switching power supplies have proven to be the best power supply device.
• the power supply device has different operating states, namely an operating state Off in the event of disconnection from the network, an operating state of commissioning after connection to the network to regular operation and an operating state of operation in regular 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.
• 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. If the energy supply device is not connected to the network or at least for a period of time, then the energy supply device is in the "off" operating state, with all energy stores, such as capacitors, being virtually without energy. If the energy supply device is connected to the network, the operating state initially changes from the operating state "off” to the operating state "startup".
• the power source of the control module is connected to a charging circuit and supplies the power source in the operating state of commissioning with electrical energy.
• Such an energy source with an associated charging circuit is known from the prior art and has proven itself best.
• the disconnecting device has at least one network-side controlled switch in the form of a relay switch or a semiconductor switch for disconnection from the network.
• the at least one controlled switch In the non-energized state of the disconnecting device, the at least one controlled switch is in an open state and does not conduct mains voltage to the power supply device.
• the enabling device 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, supplying the power supply device with the electrical energy from the network.
• the isolation devices have proven themselves in practice, especially as they cause a galvanic isolation from the network and in the state "" Unlocked “” is present at its output no electrostatic alternating field.
• the cost of this are not insignificant and the installation cost is correspondingly high, especially since the release devices are preferably arranged in a housing with attached power plug.
• the invention has for its object to simplify an electromotive furniture drive with a power supply device of the type described in more detail circuitry with improved functionality.
• the solution is achieved in that the power supply device has a disconnect unit controllable via a control line, wherein the electrical control Ersignal the control line by a switching contact of the manual control is changeable such that the power supply device in the non-actuated state of the manual operation has the operating state "Enabled".
• the controllable disconnection unit is controlled by the respective push-button switch of the manual control, wherein a control signal is triggered by the manual pressing of a button and fed via the control line into the disconnection unit connected thereto.
• the enable unit is also operatively connected to a signal feedback of a control circuit of the power supply device.
• a first embodiment provides that the enabling unit is integrated in a path of the signal feedback.
• Another embodiment provides an unlock unit which is inserted in or attached to an input path or an output path of the control device or attached thereto.
• the controllable disconnection unit has the function that it changes the signal feedback of the power supply device such that via the control output of the control device of the power supply device between a high frequency switching signal in the operating state of regular operation and no high frequency signal in the operating state "Enabled "can be switched.
• the potential of the signal feedback of the switched-mode power supply units known in the prior art and designed as a power supply device may increase with the switching frequency at the transmitter unit with increasing frequency or fall with increasing frequency. For this reason, several embodiments of enabling units come into consideration, which however all cause that in the operating state "Enabled" no high-frequency signal is applied to the transmitter unit.
• a first embodiment of a disconnection unit is formed by a node or by a feed point, wherein in the signal feedback a relatively high
• the supply voltage means the maximum of the potential on the signal feedback and as a result, the controller does not transmit a Hochfrequenzschaltsignal to the switching module, so that no high-frequency signal at the
• a non-powered auxiliary power source is provided in the form of a high-capacity battery or capacitor, wherein in the non-actuated state of the hand-held operation, a transistor switch or a handset contact is switched and electrical energy is supplied from the auxiliary power source to the feed point.
• a second embodiment of a disconnection unit is formed by another node in the path of the signal feedback, wherein the signal feedback is formed as hohohmiger control path and at the node, a switching transistor or a contact of the manual switch button is attached.
• the switching transistor In the non-actuated state of the manual control, the switching transistor is conductive or the contact of the manual switch button is closed, wherein the electrical potential of the node or the electrical potential of the signal feedback is switched to ground.
• the result of a potential-free state of the signal feedback means that the control device has no Radio frequency signal transmits to the switching module, so that no high-frequency signal is applied to the transmitter.
• a third embodiment of a disconnection unit provides a galvanic release agent in the form of a transmitting coupler.
• this enable unit When a voltage is applied to the input of this enable unit, the state changes at its output, the state at the output having a switching signal, a voltage signal or a frequency signal.
• this is designed as an optocoupler or as a photovoltaic coupler, in which case the output of the disconnection unit has a switching signal and / or a voltage signal.
• the disconnection unit will be explained in more detail by the example of an unlock unit designed as an optocoupler.
• Optocoupler used in an electrical series circuit in the path of signal feedback. Since such release units have a galvanic isolation between their input and their output, such an enable unit can also be attached to or in the control device or inserted therein in another embodiment. Thus, it is grateful that the output of the
• Optocoupler is in electrical series connection with the input of the control device or with a frequency output of the control device or with a power supply terminal of the control device in electrically conductive connection.
• a high-impedance power supply of the control device is provided.
• the switching outputs of the optocoupler or the switching outputs of a controlled by the switching output of the optocoupler transistor switch to the power supply terminals of the control device connected such that in the non-actuated state of the manual control and / or in the operating state "Unlocked" the power supply terminals of the control device with each other are connected.
• the control device is switched on the input side energy-free and since the power supply of the control device is formed high impedance, only a very low leakage current flows here.
• the isolating unit designed as a galvanic isolating means has a signal input which is connected to the control line. The switching of the potential of the control line is carried out effectively by the manual key operation of the manual control. Depending on the design of the power supply device designed as a switched-mode power supply, the potential connected to the control line must be adapted. In a first embodiment of a switching power supply-forming power supply device is provided in a non-actuated button of the manual operation, that the potential of the control line is 0 volts or approximately 0 volts.
• the transmitter unit is not supplied with a high-frequency switching signal.
• a preferred embodiment provides that in the case of an unactuated button of the manual control, the potential of the control line on the disconnecting unit is a voltage of several volts, for example 5 volts or 24 volts.
• the output of the enable unit switches such that the high-frequency switching signal can not be supplied to the transmitter unit.
• an auxiliary voltage source is provided in the form of a battery or a capacitor with a high capacitance, wherein the capacitor may be formed as a gold cap.
• the auxiliary voltage source is arranged on the secondary unit of the power supply device and is charged in the operating state of the regular operation or supplied with energy to maintain the charge.
• the auxiliary voltage source is additionally designed as a voltage source for the operation of transceivers such as radio receivers or infrared receivers or for the operation of processor units.
• the energy potential of the auxiliary voltage source is reduced in such a way that it is foreseeable that the input of the enabling unit does not have enough energy to maintain the switching state of its output. If the energy potential of the auxiliary voltage source continues to decrease, the output of the enabling unit undergoes a changeover, as a result of which the high-frequency switching signal is activated at the transmitter unit and the energy supply unit sets the operating state of regular operation. takes. In this way, an automatic recharging of the auxiliary power source by the secondary unit takes place.
• the circuit between the auxiliary voltage source and the input of the enable unit is opened according to the previously described embodiment. This is done in a simple manner by the button of the manual control is assigned a normally closed contact.
• a preferred embodiment of an NC contact in the circuit between the auxiliary voltage source and the input of the enable unit provides a transistor switch, which is turned on in the de-energized state and the control terminal is electrically connected to a trained as a contact contact terminal of a button of the hand control.
• Figure 1 is an exemplary and schematic representation of a trained as a linear drive furniture drive according to the invention with a power supply device;
• Figure 2 is a schematic block diagram of an embodiment of the
• FIG. 3 shows a schematic block diagram of a further exemplary embodiment of the energy supply device according to FIG. 1.
• FIG. 1 shows an electromotive furniture drive 1 with a power supply device 5.
• 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 linear drive 2 depending on the direction of rotation of an electric motor, not shown, a retractable and extendable lifting tube 3, at its free end a connection part in the form of a clevis 4 is mounted.
• Another connection part in the form of a further fork head 4 is fastened to the housing of the linear drive 2.
• the respective connection part is in a manner not shown in each case with a furniture component in connection, so that move the connected to the linear drive 2 furniture components relative to each other during operation of the electric motor.
• the power supply device 5 is connected according to the illustration of Figure 1 via a power cord 200 with a power plug 8, wherein in another and not shown embodiment of the power plug 8 may be disposed on the power supply device 5.
• the power supply device 5 is provided according to the illustration of Figure 1 with an enclosing housing, so that the power plug 8 can be attached to the housing or molded.
• the power plug 8 leads via power cord 200, the input-side mains voltage to the power supply device 5 designed as a switching power supply, which outputs a low voltage in the form of a DC voltage on the secondary side and forwards them to a motor controller 6.
• a hand control 7 is connected in wired form, wherein, according to the representation of FIG. 1, the hand control 7 has two pushbuttons.
• the handset 7 is coupled to the motor controller 6 via a wireless link and transmits radio waves or infrared light waves to control the at least one electric motor, i. Linear drive 2 to the engine control 6.
• the manual control 7 with a motor controller 6 in conjunction, the motor controller 6 is designed as a relay control with relay switches and / or as a semiconductor circuit with semiconductor switches.
• the manually operable push-button switch of the manual control 7 switch the control current of the relay switch or the semiconductor switch, wherein the circuit breaker of the relay switch or the semiconductor switch switch the high motor current of the linear actuator 2.
• the illustration of Figure 1 is in a second embodiment, the
• Hand control 7 with the motor control 6 in connection which is a supply cable 9 of the power supply device 5 and a motor cable 210 of the electric motor of the linear drive 2 and the electrical lines of the manually operable push-button of the hand control 7 connects to each other.
• the contacts of the manually operable push-button of the manual control 7 are designed as a circuit breaker and switch at actual pressure the high motor current.
• the power supply device 5 is inserted into the housing of the linear drive 2 or attached thereto, wherein the linear drive 2 can be constructed in a manner not shown in the manner of a double drive, which at least one motor, but preferably two Engines motors in a common housing.
• the power supply device 5 has an input circuit 10, an intermediate circuit 11, a transformer unit 14, a secondary unit 15, an optocoupler 16, a control device 17 and a control supply 18.
• the input circuit 10 is the input side (indicated by arrows) coupled to the network via power plug 8 and power cord 200.
• In the input circuit 10 are conventional network interference suppressors, such as capacitors and chokes, as well as fuses included, which are not shown here.
• the input circuit 10 is connected to the intermediate circuit 1 1, which has a rectification 12 and a switching component 13, for example a switching transistor.
• the intermediate circuit 1 1 is coupled to the switching module 13 to the transmitter unit 14.
• the transmitter unit 14 has a transformer with electrical isolation 19, which extends through the power supply device 5 therethrough.
• the secondary unit 15 On the secondary side of the transmitter unit 14, the secondary unit 15 is connected, which provides a supply voltage Uv for supplying the linear drive 2 via the supply cable 9 to the motor controller 6. A reaction of the secondary unit 15 is arranged via an optocoupler 16 with galvanic isolation 19 to the control device ⁇ .
• the control device 17 controls the switching module 13 for regulating the supply voltage Uv of the secondary unit 15.
• the control unit 17 is supplied with electrical energy by a control supply 18.
• the control device 17 and the switching module 13 are coupled to the control circuit and interconnected such that the height of the signal arriving at the control device 17
• the signal at the optocoupler 16 is variable, which changes a change in the switching frequency of the switching module 13. If the current flow at the output side of the energy supply device 5 continues to increase, the switching frequency of the switching component 13 changes such that the transmission characteristic of the transmitter unit assumes a less ideal state, which is in operative connection with a reduction in the output of the energy supply device 5 , In the event of a short circuit or a high overload on the output side of the power supply device 5
• Regenfrequenzbegrenzungs- means are provided which form an intermediate control loop with the input member of the switching block 13 and the controller 17 and limit the switching frequency of the switching component so regulating that it results in the holding voltage Uh ,
• the optocoupler 16, the control device 17, the switching module 13, the transmitter unit 14 and possibly also the secondary unit 15 are coupled to the control circuit described in more detail below or arranged therein.
• Fixed or variably adjustable setting means which determine the height of the holding voltage Uh, are connected in or on
• the secondary unit 15 has an auxiliary voltage source 41, which is designed as a voltage-connected auxiliary voltage source and as a capacitor of high capacity.
• the auxiliary voltage source 41 can be used as a network-connected auxiliary voltage source. be formed source and having an autotransformer with very low quiescent current consumption.
• the auxiliary voltage source 41 may be formed as a network-connected auxiliary voltage source.
• this grid-connected auxiliary voltage source can have an economical transformer, which is, for example, an isolation transformer with a low power.
• the economical transformer is designed such that its quiescent current consumption is reduced compared to conventional (isolating) transformers with low power and is very small.
• FIG. 2 illustrates a disconnection unit 30, which is integrated here in three exemplary embodiments in the signal feedback 40 between the secondary unit 15 and the optocoupler 16 or in the signal feedback 40 between the optocoupler 16 and the control device 17 or in or on the control device 17 or on it is scheduled.
• a control line 32 is provided, which electrically connects the input of the activation unit 30 with the manual control 7 or electrically connects the input of the release unit with the auxiliary voltage source 41.
• FIG. 3 shows a schematic block diagram of a further exemplary embodiment of the energy supply device 5 according to FIG. 1.
• the power supply device 5 of this further exemplary embodiment differs from that of the exemplary embodiment according to FIG. 2 in that a coupling unit 16 'is provided which is coupled on the secondary side to the control line 32 and on the primary side to the disconnection unit 30 which is either in the control device 17 or in the signal feedback 40 is arranged, is connected.
• the coupling unit 16 ' also has the galvanic isolation 19.
• the disconnection unit 30 (either in the control device 17 or in the signal feedback 40) in this embodiment can therefore be designed particularly simply without galvanic release means, e.g. as a switching transistor.
• the coupling unit 16 ' can be realized in different ways. It is thus possible, for example, for the coupling unit 16 'to be a further optocoupler, also in photovoltaic design. Furthermore, it is also conceivable that the coupling unit 16 'as electromechanical switch, for example as a miniature relay, is designed with appropriate galvanic isolation.
• a combination of more than one enabling device 30 is provided at different locations or in series.
• the coupling unit 16 ' is arranged parallel to the control line 32 according to the embodiment of Figure 2 as a redundant control of the enabling device 30.
• the invention is not limited to the illustrated embodiments. It is essential, however, that the power supply device 5 has an operating state "Enabled” and a switchover into or out of the operating state "Enabled” by a controllable by the manual control unit 7 disconnection unit 30, which is arranged in the signal feedback 40 of the control circuit of the power supply device 5 designed as a switching power supply is or which is arranged on the control device 17, such that in the operating state "Enabled” at one of the terminals of the transmitter unit 14 is not applied to a high frequency switching signal.

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• Health & Medical Sciences (AREA)
• General Health & Medical Sciences (AREA)
• Nursing (AREA)
• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Dentistry (AREA)
• Remote Monitoring And Control Of Power-Distribution Networks (AREA)
• Dc-Dc Converters (AREA)

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• 2011
  • 2011-05-06 DE DE102011050194A patent/DE102011050194A1/de not_active Withdrawn
• 2012
  • 2012-05-04 EP EP12718245.9A patent/EP2705586A1/de not_active Withdrawn
  • 2012-05-04 WO PCT/EP2012/058218 patent/WO2012152681A1/de active Application Filing
  • 2012-05-04 CN CN201280022009.1A patent/CN103650278B/zh not_active Expired - Fee Related
  • 2012-05-04 US US14/115,971 patent/US9236822B2/en not_active Expired - Fee Related
  • 2012-05-04 JP JP2014508816A patent/JP6124869B2/ja active Active

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