DE202015104608U1 - Arrangement with an operating device for illuminants and a circuit galvanically isolated from an inductive element of the operating device - Google Patents

Abstract

Arrangement comprising an operating device (1) for lighting means (2) and an electrical circuit (3), wherein the operating device (1) comprises at least one inductive element (7), and wherein the electrical circuit (3) comprises an inductive coupling element (9) which is arranged in a stray magnetic field of the inductive element (7).

Description

The invention relates to an arrangement comprising a control device for lighting and an electrical circuit whose power supply is made galvanically isolated from an inductive element of the operating device.

Operating equipment, including ballasts, is used for the operation of light sources such as light-emitting diodes (LED) or fluorescent lights. The operating devices are set up to generate the required supply voltage for the lighting means from a mains supply voltage and at the same time to fulfill safety-related requirements. In conjunction with the operating device and the bulbs other electrical circuits are used.

Such other electrical circuits may include sensors such as motion sensors or brightness sensors. The operation of these sensors requires the availability of a supply voltage for powering the respective sensor. The sensors can be used, for example, for metrological detection of physical parameters and transmission of the recorded parameters in an electrical sensor signal to the operating device.

To supply power to a sensor corresponding leads and often also to be supplied circuits for the control and external communication of the sensor are required. Usually, a converter used in the context of the operating device generates the necessary low-voltage supply voltage, which is supplied to the sensor via supply lines. However, the generation of this low-voltage supply voltage means additional expense within the converter, additional external connection options such as connectors and additional supply lines between converter and sensor in addition to additional connecting lines for the sensor signal for transmitting sensor data to the operating device. On the other hand, inductances of the operating device, in particular a transformer of the operating device, usually wrapped in a copper foil to control the unavoidable stray fields. The scattered power entered in the sequence thus remains unused.

Starting from the state of the art presented at the outset, the invention addresses the technical problem of improving the use of external circuits and operating devices for lighting devices in a tight spatial network and improving the overall efficiency by utilizing the energy contained in the scattering power.

This object is achieved by the features of the arrangement according to independent claim 1. Advantageous developments of the invention are defined in the dependent claims.

The object is achieved by an arrangement comprising an operating device for lighting means and an electrical circuit, wherein the operating device comprises at least one inductive element. According to the invention, an inductive coupling element of the electrical circuit is arranged in a stray magnetic field of the inductive element.

By means of the arrangement according to the invention, a power supply is provided for an external circuit to the operating device arranged electrical circuit, wherein no additional wiring for the voltage supply from the operating device to the circuit is required. The effort to connect, such as connectors, mechanical feedthroughs through a housing of the operating device, cables, cable guides is reduced by the invention.

At the same time, it is made possible to design a low-voltage circuit for the electrical circuit and an input-side mains voltage section of the operating device galvanically isolated. Thus, requirements for protection against high voltages without additional effort in a simple manner to meet.

The use of the stray field of an existing to fulfill other tasks than the power supply of the circuit anyway inductance of the operating device reduces the burden of waiving additional components in the operating device, such as a converter, in terms of number of components and required device dimensions. In particular, a power input reactor, a primary winding of an isolation transformer, a coil of a flyback converter, etc. may be the inductive element of the operating device, the stray field is used in the invention. In addition, by absorbing the scattering power on the use of the film, which normally surrounds the inductance, can be dispensed with.

According to an advantageous development of the arrangement according to the invention, the electrical circuit comprises a voltage supply means adapted to generate a supply voltage for the electrical circuit of recorded energy of the magnetic stray field.

The magnetic coupling element removes the stray magnetic field, an alternating field, by induction in a conductor of the coupling element Energy and provides them in the form of an alternating current (AC voltage) ready. By means of the voltage supply means, this induced alternating current can be rectified and used as provided low-voltage supply voltage, for example, a sensor.

According to a preferred embodiment of the arrangement according to the invention, the electrical circuit has a storage means, in particular a capacitor, for storing electrical energy.

By means of the storage means, an approximately constant low-voltage DC voltage for operation, for example, a control circuit, a micro-control circuit (English microcontroller) or a user-specific circuit (ASIC) can be provided. When using a suitable capacity as a storage means, it is also possible to ensure a continuous operation of the circuit for a pulsed operation of the operating device.

The arrangement according to a further embodiment is characterized in that the electrical circuit comprises a sensor, in particular a motion sensor, and / or a communication interface, preferably for wireless communication, and the inductive element is driven in a pulsed operation. The field energy received via the magnetic coupling element is temporarily stored in the storage means and is also available for a motion sensor which is used to activate a light source.

Another embodiment of the arrangement comprises an electrical circuit having a first communication means designed for communication with the operating device.

By means of the first communication means of the electrical circuit a signal, in particular a sensor signal or data signal of the electrical circuit is transmitted to the operating device. Thus, a communication channel between the operating device and the electrical circuit can be realized with little effort.

The first communication means of a preferred embodiment of the arrangement according to the invention preferably has a modulator designed for clocking the inductive coupling element and / or a transmitting inductance.

According to an advantageous development of the arrangement according to the invention communicates the first communication means by changing a load of the inductive coupling element with the operating device.

If the first communication means designed in such a way, special signal lines between the electrical circuit and the operating device are not required and for the power supply as well as for the signaling and / or data communication, the circuitry complexity is low.

The arrangement according to another embodiment shows the operating device with a second communication means, which is designed to communicate with the first communication means of the electrical circuit.

According to a development, the operating device is characterized in that it comprises a housing and a housing cover, wherein the electrical circuit is arranged outside the housing or on the housing of the operating device.

The inventive arrangement of an embodiment forms the inductive coupling element of the electrical circuit disposed on the housing cover or integrated into the housing cover.

The supply of the electrical circuit via magnetic coupling allows the arrangement of the electrical circuit outside the housing of the operating device. Thus, an extended and / or changed functionality of the operating device by adding a suitably designed electrical circuit, repair and / or replacement is easy to accomplish. The actual operating device can remain unchanged.

The housing cover of an advantageous development has at least one marking for designating a position of the inductive coupling element on the housing cover.

The marking enables exact positioning of the magnetic coupling element with respect to the inductive element. Even with subsequent attachment of the electrical circuit to the housing cover so optimal positioning of magnetic coupling element and inductive element and thus to achieve maximum energy extraction from the magnetic stray field.

An arrangement according to an embodiment is characterized in that the inductive coupling element together with the inductive element, a magnetic force on the electric Circuit in the direction of the housing cover exerts.

The use of the magnetic force allows improved adhesion of the electrical circuit to the housing cover, optionally in addition to a fixation by means of screws, by gluing, etc.

According to a preferred embodiment of the arrangement according to the invention, the inductive element is at least part of an LLC transformer of the operating device and / or an inductance of a converter of the operating device.

The use of existing and technically necessary inductances of the operating device and its magnetic stray field allows energy supply external electrical circuits without additional equipment-side effort.

The invention will be explained in more detail with reference to embodiments and figures. Show it

1 a schematic representation of an inventive arrangement of a control gear and an electrical circuit,

2 Views of an inventive arrangement of a control gear and an electrical circuit,

3 a schematic representation of an electrical circuit according to the invention of a first embodiment,

4 a schematic representation of an electrical circuit according to the invention of a second embodiment, and

In the figures, like reference numerals designate the same or corresponding elements. For the sake of illustration, a repetition is largely dispensed with in the following description of advantageous embodiments.

In 1 an arrangement according to the invention is shown according to a first embodiment of the invention. The arrangement comprises a control gear 1 for the operation of a light source 2 and an electrical circuit 3 , In 1 is a light source 2 shown in the form of an LED. It is without departing from the invention, also possible that the operating device 1 several bulbs 2 , which in turn supplies a plurality of light-emitting elements such as LEDs, gas discharge lamps, etc. supplies.

The invention will be explained on the example of an LLC converter for operating at least one light source, for example an LED track. Driver circuits for the operation of light-emitting diodes are known. For example, drivers with an LLC circuit are used as driver circuits, hereinafter referred to as LLC converter. In LLC converters, a (series) resonant circuit is powered by a (mains) AC voltage. The resonant circuit feeds a primary-side transformer coil. A secondary-side transformer coil then directly supplies a light source. The supply voltage supplied to the lamp will typically be a DC voltage. The DC voltage can in principle be generated by a rectifier circuit. However, it is advantageous to carry out the rectification by means of a transformer with center tap on the secondary coil.

The LLC converter is thus an electrical circuit, the input side fed by a mains AC voltage and to the light source, for example, one or more LEDs, can be connected, and the output side provides a DC voltage for a defined operation.

This in 1 illustrated operating device 1 has a power input 4 on. At the network entrance 4 is a mains input voltage U _NETZ . The operating device 1 is shown as an LLC converter. It follows, from the mains input 4 her considered a half-bridge circuit 5 and then a series resonant circuit 6 , About a transformer 7 then the LED output 8th fed. The generated output voltage U _LED is at the LED output 8th for the light source 2 provided.

For the shown control gear 1 becomes an AC voltage or an AC current from the half-bridge circuit 5 generated and connected to a series resonant circuit 6 provided. The energy provided by the AC voltage oscillates in a resonant circuit and is at least partially connected to the load of the transformer 7 issued.

The series resonant circuit of the LLC converter generally consists of a capacitor C, an inductor L and another coil L '. The additional coil L 'serves to supply the energy provided by means of the alternating voltage to the lighting means 2 to transport as a load. To be able to transport the energy, the load is transmitted through the transformer 7 with the series resonant circuit 6 coupled. The transformer 7 serves as a galvanic barrier (galvanic barrier) between the generated AC voltage and the output to the lamp DC voltage.

The transformer 7 provides a galvanic isolation of input side section with high line voltage and an output side section with low voltage supply voltage for the bulb 2 for sure. By means of it transformer 7 Thus, a potential barrier, also called SELV barrier, realized for protective separation. In the transformer 7 For example, a primary-side AC input current generates an alternating magnetic field that induces an AC output current in the secondary-side coils. Here are the primary-side input coil and the at least one secondary-side output coil, shown in FIG 1 are two output coils, for example, applied to a ferrite or iron core with high magnetic conductivity (permeability) μ. The power transmission between the primary side and the secondary side essentially takes place via an alternating magnetic field via the magnetic flux Φ in the ferrite core of the transformer.

It is customary to generate additional auxiliary voltages induced via auxiliary windings on the ferrite core, which supply, for example, control circuits of the operating device via supply lines with electrical energy.

The transformer 8th However, not only has a magnetic flux Φ in the ferrite core, which also flows through the secondary windings of the transformer, starting from the primary windings, but also has a magnetic leakage flux Φ _S. Due to a necessary spatial distance of several windings of the transformer comes to a magnetic leakage flux Φ _S. The stray magnetic flux Φ _S is caused by the primary winding, but does not penetrate the secondary-side coils. As a result, this leakage flux Φ _S does not contribute to the magnetic coupling of the primary side to the secondary side of the transformer 7 at. The magnetic leakage flux Φ _S is therefore to be understood as a "flux loss". This leakage magnetic flux Φ _S can be achieved by wrapping the transformer 7 be reduced with copper foil. This will reduce the power dissipation of the transformer 7 reached.

According to the invention, in the region of the magnetic leakage flux Φ _{S of} the transformer 7 an inductive coupling element 9 arranged. This inductive coupling element 9 For example, it can be designed as at least one conductor loop or in the form of an antenna with a suitable design. In the inductive coupling element 9 is induced by the magnetic leakage flux Φ _S, a current, which now to the power supply of the electrical circuit 3 can be used. With the arrangement according to the invention are scattering powers of z. B. 1 to 4 watts from the stray magnetic field to supply active electrical circuits, which have only a low power consumption, refer.

Above, the discussion of the voltage supply according to the invention by means of the magnetic field or Induktivtäten. The consideration is equally valid for the consideration of electromagnetic fields in a corresponding manner. Here, the term inductive coupling element 9 to equate with the term aerial.

The electrical circuit 3 after the in 1 shown embodiment includes in addition to an inductive coupling element 9 a power supply means comprising a rectifier 10 and a capacity 11 , The rectifier 10 receives from the inductive element 9 one in the inductive coupling element 9 induced AC voltage and generates by rectification a low voltage DC voltage with a suitable voltage level for supplying a control circuit 12 , This low voltage DC voltage is located on a storage means 11 for example, this low-voltage DC voltage smoothes, short-circuiting voltage peaks and stores electrical energy.

The storage means 11 is preferably realized as a capacitor (capacitance). In particular, as a storage means 11 a capacitor of high energy density suitable. As storage means 11 It is particularly advantageous to use a double-layer capacitor, also known as an electrochemical double-layer capacitor (EDLC) or a supercapacitor ("Goldcap" ^TM ).

The electrical circuit 3 to 1 further includes a sensor 13 that is via the control circuit 11 is supplied with voltage. A measured variable recorded by the sensor, for example for a physical parameter to be detected, such as brightness, is determined by the control circuit 12 detected, according to an embodiment cached, and / or in the form of detected sensor data to a first communication means 14 to hand over.

The first means of communication 14 According to an advantageous embodiment example, sensor data in the form of a sensor signal to the operating device is designed 1 to convey. The first means of communication 14 an embodiment includes a modulator for this purpose. The first means of communication 14 can continue line driver for transmitting the sensor signal by means of special sensor signal lines to the operating device 1 include. The first means of communication 14 Another embodiment includes a bus driver to transmit the sensor data via a bus, in particular a DALI bus. The electrical circuit 3 to 1 shows, however a sensor signal line from the first communication means 14 to the inductive element 9 , The first means of communication 14 to 1 is designed to be wireless, for example by a special transmission inductance or by suitably modulated clocking of the inductive coupling element 9 to a signal to the operating device 1 to convey.

The operating device 1 According to one embodiment of the teaching according to the invention comprises a in 1 not shown second communication means. The second communication means is adapted to receive the signal with the sensor data and / or other data such as control data, status data, etc., to demodulate the signal and to extract the transmitted information and / or sensor data and for further processing in the operating device 1 and / or to provide transmission to other receivers by the operating device.

Embodiments of the invention with different versions of the communication channel for signal transmission between the operating device 1 and electrical circuit 3 be referring to the 3 and 4 explained in more detail.

First, in 2 two views of an inventive arrangement according to a first embodiment of the invention shown. In the upper partial view of the 3 is the top view of an inventive arrangement of control gear 1 and electrical circuit 3 shown.

The electrical circuit 3 in 2 connects via two sensor lines 16 . 17 the sensor 13 For example, a motion sensor. These sensor cables 16 . 17 can supply the power to the sensor 13 as well as the transmission of sensor signals (sensor data) to the main assembly 3.1 of the electrical circuit 3 to ensure. The main assembly 3.1 of the electrical circuit 3 is in 2 as an electrical circuit 3 as a circuit board 20 with applied components 18 . 19 . 21 shown. The circuit board 20 has a further in the upper part of the view 2 illustrated conductor track structure 22 on which the inductive coupling element 9 realized.

Contrary to the illustration in 2 becomes the electrical circuit 3 preferably arranged in a separate circuit housing. This circuit housing is particularly preferably at least in the region of the magnetic coupling element 9 permeable and low attenuation for magnetic fields. This circuit housing may be the electrical circuit 3 even partially cover. Thus, the circuit package may be formed such that it is only an upper side of the electric circuit 3 not through the case cover 24 protected, covered.

The housing cover 24 an embodiment of the invention also shows a marker 25 on its top. The top of the housing cover 24 is the area of the housing cover 24 after reassembling the housing cover 24 and the housing 23 facing outward. The mark 25 can be color-coded or tactilely distinguishable mark an area on the housing cover 24 describe. Will the inductive coupling element 9 on this marked area of the housing cover 24 arranged, so is the magnetic coupling element 9 can extract a particularly high scattering power from the magnetic stray field. The mark 25 may be formed according to a further embodiment, that it at least partially the function of a mechanical attachment of the electrical circuit 3 on the housing cover 24 can take over. This can be done, for example, by the formation of rail-like guides on the top of the housing cover 24 respectively.

The circuit housing of the electrical circuit 3 or the circuit board 20 For example, by screwing or an adhesive bond on the housing 23 , or, as in 2 shown on the housing cover 24 be attached. At least additional adhesion of the electrical circuit 3 on the housing 23 is exerted by the magnetic force of the inductive element (transformer) 7 on the electrical circuit 3 in the direction of the housing cover 24 to achieve.

In the lower part of the view 2 is a side view of the inventive arrangement of control gear 1 and electrical circuit 3 shown in a partial section. In this case, the housing is in an area of the lower part of the figure 23 so shown that the spatial arrangement of the transformer 7 on a main circuit board 26 of the operating device 1 is recognizable. It is from the lower part of the figure 2 it can be seen that the inductive coupling element 9 directly above the transformer 7 , but external to the housing 23 with housing cover 24 of the operating device 1 is arranged. This is a particularly favorable arrangement of the inductive coupling element 9 with regard to the energy to be removed from the stray field of the transformer 7 reached.

In 3 is a schematic representation of an electrical circuit according to a first embodiment of the invention shown. In this case, a communication channel as the feedback channel between the electrical circuit 3 and the operating device 1 realized. This communication channel is provided by a first communication means 14 on the side of the electrical circuit 3 fed. The first means of communication 14 may include a modulator for generating a transmission signal by modulating the data to be transmitted on a carrier. The transmission signal is either wirelessly via special data lines, via a bus, in particular via a DALI bus, or wirelessly to the operating device 1 and / or to other recipients, eg. B. transmitted a central light control unit. The first means of communication 14 For example, line driver for transmitting the sensor signal by means of special sensor signal lines to the operating device 1 include. The first means of communication 14 A further embodiment comprises a bus driver for transmitting the sensor data via a bus, in particular a DALI bus.

In 4 is a schematic representation of an electrical circuit according to the invention according to an advantageous second embodiment of the invention shown. The electrical circuit 3 to 4 shows a switch 27 , The desk 27 is through the control circuit 12 controlled and according to the data to be transmitted, z. B. Sensor data of the sensor 13 , switched. By switching the switch 27 , which can be realized by a transistor, for example, is at an output 29 of the inductive element 9 changed effective load. This is due to clocking of the inductive element 9 through the switch 27 a modulation of the load of the inductive element 9 depending on by the control unit 12 reached issued switch signal. The control unit 12 Can use sensor data from the sensor 13 to an unillustrated control unit of the operating device 1 to transfer. The first means of communication 14 is thus set up to transmit sensor data wirelessly to the operating device, without its own data lines in addition to the operating device 1 outgoing from the electrical circuit 3 and to use without conventional methods for wireless data transmission.

This is a particularly advantageous arrangement of one or more sensors 13 in conjunction with at least one operating device 1 for bulbs 2 realized that require only small additional circuit and installation costs for power supply and signal transmission according to the invention.

The communication channel between the operating device 1 and the electrical circuit 3 can also be bidirectional. The first means of communication 14 and the second communication means are then suitable for duplexing.

The features described above can be combined with one another in the context of the invention defined in the claims in an advantageous manner.

Claims (13)

Arrangement comprising an operating device ( 1 ) for illuminants ( 2 ) and an electrical circuit ( 3 ), whereby the operating device ( 1 ) at least one inductive element ( 7 ), and wherein the electrical circuit ( 3 ) an inductive coupling element ( 9 ), which in a stray magnetic field of the inductive element ( 7 ) is arranged. Arrangement according to claim 1, characterized in that the electrical circuit ( 3 ) a power supply ( 10 . 11 ) arranged to generate a supply voltage for the electrical circuit ( 3 ) from absorbed energy of the stray magnetic field. Arrangement according to one of claims 1 or 2, characterized in that the electrical circuit ( 3 ) a storage means ( 11 ), in particular a capacity, for storing electrical energy. Arrangement according to one of claims 1 to 3, characterized in that the electrical circuit ( 3 ) a sensor ( 13 ), in particular a motion sensor, and / or a communication interface, and the inductive element ( 7 ) is driven in a pulsed mode. Arrangement according to one of claims 1 to 4, characterized in that the electrical circuit ( 3 ) a first communication means ( 14 ) designed for communication with the operating device ( 1 ). Arrangement according to claim 5, characterized in that the first communication means ( 14 ) a modulator designed for clocking the inductive coupling element ( 9 ) and / or a transmission inductance. Arrangement according to one of claims 5 or 6, characterized in that the first communication means ( 14 ) is arranged by means of changing a load of the inductive coupling element ( 9 ) with the operating device ( 1 ) to communicate. Arrangement according to one of claims 5 to 7, characterized that the operating device ( 1 ) a second communication means arranged for communication with the first communication means ( 14 ) of the electrical circuit ( 3 ). Arrangement according to one of claims 1 to 8, characterized in that the operating device ( 1 ) a housing ( 23 ) and a housing cover ( 24 ), and that the electrical circuit ( 3 ) outside the housing ( 23 ) is arranged. Arrangement according to claim 9, characterized in that the inductive coupling element ( 9 ) of the electrical circuit ( 3 ) on the housing cover ( 24 ) or in the housing cover ( 24 ) is integrated. Arrangement according to one of claims 9 or 10, characterized in that the housing cover ( 24 ) at least one marker ( 25 ) for designating a position of the inductive coupling element ( 9 ) on the housing cover ( 24 ) having. Arrangement according to one of claims 9 to 11, characterized in that the inductive coupling element ( 9 ) together with the inductive element ( 7 ) a magnetic force on the electrical circuit ( 3 ) in the direction of the housing cover ( 24 ) exercises. Arrangement according to one of the preceding claims, characterized in that the inductive element ( 7 ) at least part of an LLC transformer of the operating device ( 1 ) and / or an inductance of a converter of the operating device ( 1 ).

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