KR20110094250A - Circuit arrangement for operating at least one lighting means - Google Patents

Abstract

PURPOSE: A circuit device for operating at least one lighting unit is provided to effectively control the flow of compensation currents by arranging a diode in a proper location. CONSTITUTION: Diodes(D1,D2) are inserted between a spot(K) and a voltage divider. Voltage dividers(RL11,RL12), a rectifier(GL1), and an electronic ballast(EVG1) are integrated in a first processing device(VA1). Voltage dividers(RL21,RL22), a rectifier(GL2), and an electronic ballast(EVG2) are integrated in a second processing device(VA2).

Description

Circuit arrangement for operating at least one lighting means {CIRCUIT ARRANGEMENT FOR OPERATING AT LEAST ONE LIGHTING MEANS}

The invention relates to a circuit arrangement for operating at least one lighting means. The circuit arrangement is reproduced in the example of street lighting, but may be applied to other areas as is known to those skilled in the art.

1 shows a circuit arrangement for road lighting known in the art in this context. In this case, the rectifier GL1 is connected to the first phase L1 of the three-phase-supply network and the zero conductor of the three-phase supply network on the input side. An output of the rectifier GL1 is coupled to an electronic ballast EVG1 for power supply, and the electronic ballast supplies power to at least one luminaire La1. In the example of the road lights mentioned above, the lamp output is often reduced at night to save energy. For this purpose, a connecting cable having a network potential is used. In this case, the signal for the control input unit St1 of the electronic ballast EVG1 is generated by a dimming push button DIM. The signal provided to the control input St1 of the electronic ballast EVG1 is evaluated in relation to the operating period of the dimming push button DIM or the number of times of the dimming push button DIM and the corresponding dimming of the lamp La1. Is carried out. There is a microprocessor in the electronic ballast for this purpose, which calculates the number of mains waves, for example while the dimming push button (DIM) is in a depressed state. The microprocessor can interpret, inter alia, a short press action as a switch on / switch off, and a relatively long press action as a dimming request.

A voltage divider comprising resistors RL11 and RL12 is coupled between the dimming push button DIM and the rectifier output terminal GND of the rectifier GL1. The pick-up point A1 of the voltage divider is coupled to the control input St1 of the electronic ballast EVG1. The rectifier output terminal GND of the rectifier GL1 represents the reference potential of the electronic ballast EVG1.

Although there are a number of EVGs powered from one rectifier within the three phase system, due to cost and wiring issues all lighting fixtures are provided with only one connecting cable, i.e. only one dimming push button. Preferably, no power is supplied to the rectifier from above when the dimming push button DIM is coupled. In order to block the influence between lighting fixtures, a relay is used in each lighting fixture in the prior art. The phases present in the individual luminaires, that is, the phases supplying power to the rectifiers of the individual luminaires, are connected to the control inputs St1 of the electronic ballast EVG through respective relays. However, the installation of the relay incurs more costs.

An alternative solution is to use multiple connecting cables, ie one connecting cable per phase. However, the use of such connecting cables increases the complexity of the wiring and incurs unintentional additional costs.

It is therefore an object of the present invention to provide a circuit arrangement in which mutual influence is cut off despite the use of at least two phases of a three-phase network for the power supply of electronic ballasts, in which case the circuit arrangement is a single device without a relay. It is enough to have a connecting cable.

This object is achieved through a circuit arrangement having the features of claim 1.

According to the invention, a circuit arrangement for operating at least one lighting means comprises: a first phase connection terminal for coupling with a first phase of a three phase supply network; A second phase connection terminal for coupling with a second phase of the three phase supply network; A dimming signal input terminal for coupling with a source of a dimming signal, in which case the source of dimming signal is in series between a connection terminal to a third phase of the three-phase supply network and the dimming signal input terminal A dimming push button coupled to); And an input having a zero conductor terminal for coupling with a zero conductor of the three-phase supply network. Also, the circuit device includes at least one first processing device, in which case the first processing device comprises: a first input terminal coupled to a first phase connection terminal of the phase connection terminals of the circuit device; A second input terminal coupled to the dimming signal input terminal of the circuit device; A third input terminal coupled with the zero conductor terminal of the circuit arrangement; A rectifier having first and second rectifier input terminals and first and second rectifier output terminals, in which case the first rectifier input terminal is coupled to the first input terminal and the second rectifier input terminal is connected to the third input Coupled to the terminal); An electronic ballast coupled to the first and second rectifier output terminals for power supply, in which case the potential appearing at the second rectifier output terminal is a reference potential of the electronic ballast, and the electronic ballast is a dimming input and the at least one An output for connecting the lighting means); And a voltage divider coupled in series between the second input terminal and the second rectifier output terminal, in which case the pick-up point of the voltage divider is coupled to the dimming input of the electronic ballast. According to the present invention, the first processing device also includes a diode coupled in series between the second input terminal and the voltage divider of the at least one first processing device.

The basic perceptions of the invention are shown with reference to FIG. FIG. 2 shows a first assembly corresponding to FIG. 1, in which a rectifier GL1 is coupled to the first phase L1 and the zero conductor of the three-phase supply network. Figure 2 also shows a second assembly, in which a rectifier GL2 is coupled to the second phase L2 and the zero conductor of the three-phase supply network. The connecting cable is formed by a dimming push button DIM being coupled between the third phase L3 and the node K of the three-phase supply network, in which case the node K is the voltage divider RL11 of the first assembly. , RL12 and the voltage dividers RL21 and RL22 of the second assembly.

In the three-phase supply network, as is known, the phases L1, L2, L3 are each displaced from each other by 120 °. The control inputs St1, St2 of the two assemblies are coupled at the point K, as a result of which the compensation currents according to the respective phase positions of the phases L1, L2 are already present without the operation of the dimming push button DIM. (I _a ) flows. In the example shown in FIG. 2, the instantaneous voltage of the phase L2 is positive, and the instantaneous voltage of the phase L1 is negative. Therefore, the compensating current I _a passes from the phase L2 to the rectifier GL2, the rectifier output terminal GND and the voltage dividers RL22 and RL21 of the rectifier GL2, and the voltage dividers RL11 and RL12. After passing through the node K of the furnace, it flows to the rectifier output terminal GND of the rectifier GL1. Thus, although the dimming push button DIM is not depressed, at the pickup points of the voltage dividers RL11 and RL12, a signal which is interpreted as a dimming signal is generated after a corresponding evaluation is performed in the electronic ballast EVG1. . At different points in time, ie at different phase positions, different compensation currents are caused. The generation of these other compensating currents leads to unpredictable photo phenomena and flickering phenomena which continue to change.

On the basis of this recognition, according to the present invention the flow of compensation currents and unintentional dimming and blinking phenomena are prevented by the coupling of the individual diodes between the node K and the individual voltage divider. By correspondingly orienting the diode, only one current flow is realized in the direction required when the dimming push button DIM is pressed to apply a dimming signal to the corresponding control input of the respective electronic ballast. Thus, the effects of compensation currents and unintended compensation currents are effectively blocked. The use of expensive relays can also be omitted. By requiring only one connecting cable, the complexity of the wiring can be significantly reduced compared to the prior art.

In a preferred embodiment the diode is arranged in such a way that the anode of the diode is coupled to the second input terminal of the at least one first processing device and the cathode of the diode is coupled to an associated voltage divider. This effectively prevents the flow of reverse compensation currents.

In one refinement of the circuit arrangement according to the invention there is also provided at least one second processing device, in which case the first input terminal of the second processing device is not coupled to the first input terminal of the first processing device. It is connected to the phase connection terminal.

Finally, the input of the circuit arrangement may comprise a third connection terminal for coupling to a third phase of the three phase supply network, in which case the circuit arrangement also comprises a third processing arrangement, and the third processing The first input terminal of the device is coupled to the third phase connection terminal. This allows all three phase connection terminals of the three phase supply network to be used for powering electronic ballasts without causing mutual influences and disturbances.

Embodiments of the present invention are now described in more detail below with reference to the accompanying drawings:
1 is a schematic diagram of a circuit arrangement known in the prior art for operating at least one lighting means,
FIG. 2 is a schematic diagram of a study involving preliminary considerations for displaying compensating currents that cause unintended photosensitive and flicker phenomena, FIG.
3 is a schematic diagram of a first embodiment of a circuit device according to the present invention;
4 is a schematic view of a second embodiment of a circuit arrangement according to the present invention.

Figure 3 schematically shows one embodiment of a circuit arrangement according to the invention. This embodiment actually corresponds to a study with preliminary considerations, shown in FIG. 2, so that reference numerals inserted in connection with FIG. 2 are cited in the embodiment shown in FIG. 3 and are not introduced once more.

In contrast to the illustration of FIG. 2, in the embodiment of the circuit arrangement according to the invention shown in FIG. 3, each diode D1 or D2 has a point K and an individual voltage divider RL11, RL12 or RL21, RL22. In this case, the individual diodes D1 and D2 are arranged such that only one current flow is implemented in the direction of the individual voltage divider RL11, RL12 or RL21, RL22 from the dimming push button DIM. Thus, the flow of compensation currents I _a (see FIG. 2) is effectively prevented. Only one current flow (I _s ) is still possible from the connecting cable to the individual voltage divider.

The voltage dividers RL11 and RL12, the rectifier GL1 and the electronic ballast EVG1 are integrated in the first processing apparatus VA1, and the voltage dividers RL21 and RL22, the rectifier GL2 and the electronic ballast EVG2 are processed in the second process. It is integrated in the device VA2.

The embodiment shown in FIG. 4 is designed as opposed to the embodiment shown in FIG. 3 with respect to the signals provided to the evaluation units on the individual control inputs St1 and St2. In addition, the processing devices VA1 and VA2 comprise a voltage source + U for supplying a positive supply voltage. An additional ohmic resistor is coupled between each connection terminal and each voltage divider connected to the voltage source (+ U); Ohmic resistance R _L13 is coupled for the processing apparatus VA1, and Ohm resistance R _L23 is coupled for the processing apparatus VA2. Further, protection diodes D3 and D4 may be provided, which are optionally connected in parallel to the individual voltage dividers.

Through these measures, the voltage value is adjusted by the voltage dividers in the individual control inputs St1 and St2 during normal operation. Thus, the individual electronic ballasts EVG1 and EVG2 detect the signal. When the dimming push button DIM is triggered, if the voltage is low or negative in phase L3, current flow is stopped in the individual voltage divider. As a result, the voltage drops to zero volts at the respective control inputs St1 and St2. The respective electronic ballasts EVG1 and EVG2 recognize the fact that the dimming push button DIM has been activated by looking at the signal incompatibility at the respective control inputs St1 and St2.

In one embodiment not shown, the embodiments shown in FIGS. 3 and 4 are extended by one further processing device, the rectifier of the further processing device being zero conductor when phase L1 is replaced by phase L3. And to the third phase L3 (compare with the illustration of FIG. 1).

The dimming push button DIM may be realized as a sensing device or a switch in all embodiments.

Claims (4)

A circuit arrangement for operating at least one lighting means (La1) having an input and at least one first processing apparatus (VA1),
The input unit includes a first phase connection terminal L1 for coupling with a first phase of a three-phase supply network; A second phase connection terminal (L2) for coupling with a second phase of the three-phase supply network; A dimming signal input terminal K for coupling with a source of a dimming signal, the source of the dimming signal being in series between a connection terminal L3 to a third phase of the three-phase supply network and the dimming signal input terminal K; A dimming push button (DIM) coupled to the; And a zero conductor terminal N for coupling with the zero conductor of the three phase supply network,
The at least one first processing apparatus VA1
A first input terminal coupled to the first phase connection terminal L1 of the phase connection terminals of the circuit device;
A second input terminal coupled to the dimming signal input terminal K of the circuit device;
A third input terminal coupled to the zero conductor terminal N of the circuit arrangement;
Rectifier GL1 having first and second rectifier input terminals and first and second rectifier output terminals GND, wherein the first rectifier input terminal is coupled to the first input terminal and the second rectifier input terminal is Coupled to a third input terminal;
Electronic ballast EVG1 coupled to the first and second rectifier output terminals GND for power supply—The potential present at the second rectifier output terminal GND is the reference potential of the electronic ballast EVG1, and The electronic ballast EVG1 comprises a dimming input St1 and an output for connecting the at least one lighting means La1;
Voltage dividers RL11 and RL12 coupled in series between the second input terminal and the second rectifier output terminal GND-the pick-up point A1 of the voltage dividers RL11 and RL12 is a dimming of the electronic ballast EVG1. Coupled to input St1; And
A diode D1 coupled in series between the second input terminal and the voltage dividers RL11 and RL12 of the at least one first processing apparatus VA1.
Including,
Circuit arrangement for actuating at least one lighting means. The method of claim 1,
The anode of the diode D1 is coupled to the second input terminal of the at least one first processing device VA1 and the cathode of the diode D1 is coupled to the voltage dividers RL11 and RL12. In which the diode D1 is disposed,
Circuit arrangement for actuating at least one lighting means. 3. The method according to claim 1 or 2,
The circuit arrangement also includes at least one second processing apparatus VA2, wherein the first input terminal of the second processing apparatus VA2 is not coupled to the first input terminal of the first processing apparatus VA1. Coupled to the second phase connection terminal L2,
Circuit arrangement for actuating at least one lighting means. 4. The method according to any one of claims 1 to 3,
The input of the circuit arrangement comprises a third phase connection terminal L3 for coupling with a third phase of the three phase supply network, the circuit arrangement also comprising a third processing apparatus, the third processing apparatus A first input terminal of the coupled to the third phase connection terminal,
Circuit arrangement for actuating at least one lighting means.

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