EP0913072A1 - Unite de commande d'alimentation pour une lampe - Google Patents

Unite de commande d'alimentation pour une lampe

Info

Publication number
EP0913072A1
EP0913072A1 EP97940005A EP97940005A EP0913072A1 EP 0913072 A1 EP0913072 A1 EP 0913072A1 EP 97940005 A EP97940005 A EP 97940005A EP 97940005 A EP97940005 A EP 97940005A EP 0913072 A1 EP0913072 A1 EP 0913072A1
Authority
EP
European Patent Office
Prior art keywords
power supply
signal
supply control
oscillator
control according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
EP97940005A
Other languages
German (de)
English (en)
Inventor
Hermann Kovacs
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0913072A1 publication Critical patent/EP0913072A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B39/00—Circuit arrangements or apparatus for operating incandescent light sources
    • H05B39/04—Controlling
    • H05B39/08—Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices
    • H05B39/083—Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices by the variation-rate of light intensity
    • H05B39/085—Controlling by shifting phase of trigger voltage applied to gas-filled controlling tubes also in controlled semiconductor devices by the variation-rate of light intensity by touch control

Definitions

  • the present invention relates to a power supply control for a lamp and in particular for a lamp, which consists of a lamp and a lamp housing.
  • the lamp of a lamp is switched on by briefly touching the electrically conductive part of the lamp which serves as a sensor. If the sensor is touched for a longer period of time, the brightness of the illuminant can be changed if necessary.
  • the lamp is switched off by another brief touch on the sensor.
  • This known circuit arrangement has a lamp which is connected to an AC mains voltage via a triac.
  • a control unit to which the sensor is connected sends a control signal to the triac. With the control signal, the triac is switched on, switched off or controlled according to the desired brightness of the lamp.
  • the brightness control of the lamp is carried out in accordance with a phase cut control, which is determined by the instantaneous value of the control signal.
  • the amplitude of the mains voltage divided by means of a high-resistance voltage divider changes.
  • the lamp can thus be switched on or off, or the brightness thereof can be controlled.
  • control unit contains an oscillator circuit which is fed by means of a direct voltage which is obtained from the mains voltage by means of a rectifying and converting circuit.
  • An output of the oscillator circuit is coupled to the electrically conductive part of the lamp serving as a sensor. If an operator now touches the electrically conductive part of the lamp serving as a sensor, the load of the oscillator contained in the oscillator circuit changes, as a result of which the frequency and / or the amplitude of the output signal of the oscillator change. This change in the output signal is detected by an evaluation circuit, which is also contained in the control circuit. Depending on such a change, the control signal with which the triac is controlled is then generated.
  • protection class 1 state that the phase or the neutral conductor of an electrical device must be insulated in a simple form from housing parts of the device. Furthermore, electrically conductive parts of the housing must be electrically conductively connected to a protective conductor which is at ground potential.
  • Such systems for the power supply of electrical devices using three conductors, namely a phase, a neutral conductor and a protective conductor, are widespread.
  • the present invention has for its object to provide a power supply control for a lamp, such that electrically conductive parts of the lamp housing are used as a sensor for switching on, switching off or controlling the brightness of the lamp's lamp can, even if the electrically conductive parts of the lamp housing are electrically coupled to a ground potential.
  • the present invention provides a power supply control for a lamp, which has a lamp and an at least partially electrically conductive lamp housing, in which the at least partially electrically conductive lamp housing is electrically coupled to a ground potential, and in which the at least partially electrically conductive lamp housing is also used as a sensor for Switching on, switching off or controlling the brightness of the lamp can be used.
  • an at least partially electrically conductive lamp housing as a sensor if the same is connected to a ground potential. tially connected, as is the case with conventional lamps that meet the requirements of protection class 1 of the VDE guidelines.
  • the present invention is based on the finding that, for example, by providing an amplitude and / or frequency-selective device for signal quantities that serve to supply power to the illuminant, an electrical coupling between the conductive lamp housing parts and the ground potential can be created, while also electrical decoupling between the output of the oscillator in the control circuit and the ground potential can be achieved. This makes it possible to use the electrically conductive lamp housing parts as a sensor, while protection according to the regulations of protection class 1 of the VDE guidelines remains.
  • amplitude and / or frequency selective device can be any device which forms a large impedance for the oscillator signal and forms a small impedance for the oscillator (comparable to the large impedance) for the oscillator.
  • a device is referred to in the following description with an amplitude and / or frequency selective device, which can be, for example, a choke coil or a diode or a triac.
  • the present invention thus enables electrically conductive parts of the lamp housing to be used as switches or dimmer switches for adjusting the brightness of the lamp, even in the case of lamps which meet the requirements of protection class 1 in accordance with the VDE guidelines.
  • FIG. 1 shows a schematic representation of a power power control for a lamp according to the present invention.
  • Fig. 2 shows an embodiment of an amplitude and / or frequency selective device according to the present invention.
  • the present invention is described in connection with a conventional three-wire power supply system which has a phase P, a neutral conductor N and a protective conductor S.
  • Fig. 1 the three conductors P, N and S are shown.
  • the phase conductor P and the neutral conductor N serve to supply power to an illuminant 10.
  • the illuminant 10 is arranged in a lamp which also has a lamp housing 12.
  • lamp housing as used herein is not intended to be limited to its original meaning “housing”, but is also intended to mean other parts that a lamp may have, e.g. Include lampshades, brackets, fasteners, etc.
  • the lamp housing is electrically isolated from the lines P, N.
  • a control circuit 14 is connected between the phase conductor P and the neutral conductor N.
  • the control circuit has a rectification and conversion circuit, an oscillator circuit and an evaluation circuit.
  • the rectification and conversion circuit is used to rectify and convert the AC mains voltage, for example 230 volts at 50 Hz, which is used to feed the illuminant 10, to a DC voltage of, for example, 12 V for feeding the oscillator circuit and the evaluation circuit.
  • the oscillator circuit which in the control circuit 14 hold, has an oscillator that generates an oscillator signal with a frequency of 100 kHz, for example. However, the size of the frequency is not critical and other frequency values can be used.
  • the output of the oscillator circuit, from which the oscillator signal is supplied, is connected in the preferred exemplary embodiment via a coupling device 16 to the electrically conductive lamp housing 12 or to an electrically conductive part of an at least partially electrically conductive lamp housing 12.
  • the coupling device 16 has, for example, capacitors with a low capacitance, for example 1 nF, in order to decouple the control circuit in a direct current manner.
  • the coupling device can also have a filter device for filtering undesired frequency components.
  • the control circuit 14 which can be implemented as an integrated circuit, also has the evaluation circuit.
  • the evaluation circuit is electrically coupled to a switching device 18.
  • the switching device 18 is used to switch or control the electrical power that is supplied to the lamp 10.
  • the evaluation circuit controls the switching device 18 as a function of the output signal of the oscillator circuit, as will be explained in more detail below.
  • fuses 20a and 20b are provided in the phase conductor P and the neutral conductor N on the input side in front of the control circuit 14.
  • a first connection of an amplitude- and / or frequency-selective device 22 is electrically connected to the at least partially electrically conductive lamp housing.
  • a second connection of the amplitude and / or frequency selective device is connected to a ground potential, to which the protective conductor S is connected in the present exemplary embodiment.
  • the amplitude and / or frequency selective device is in the embodiment shown in Fig. 1 thus connected in the current path of the protective conductor S.
  • the oscillator circuit of the control circuit 15 generates an oscillator signal, the frequency of which is influenced by the capacitive load which is present at the oscillator output.
  • the capacitive load is formed by the at least partially electrically conductive lamp housing and, in the exemplary embodiment shown in FIG. 1, by the coupling device 16.
  • the signal output by the oscillator is decoupled from the ground potential on which the protective conductor S lies by the amplitude and / or frequency selective device 22, which represents a high impedance for the amplitude and / or the frequency of the oscillator signal. If a user touches the electrically conductive part of the lamp housing serving as a sensor, the capacitive load on the oscillator changes and thus the frequency of the oscillator signal generated by the oscillator.
  • the evaluation circuit in the control circuit 15 responds to such a frequency change in order to control the switching device 18, i.e. to switch the lamp 10 on or off or to change the brightness of the same in the manner of a dimmer.
  • This method of controlling the switching device is known in the art.
  • the protective effect of the power supply control according to the invention which enables the use of lamps which meet the requirements of protection class 1 in the form described above, is explained in more detail below.
  • the conductors P and N are electrically insulated from the housing 12. However, it is possible that if the lamp is damaged, an electrically conductive connection between one of the conductors P or N and the electrically conductive lamp housing 12 occurs.
  • the protective conductor which connects the at least partially electrically conductive lamp housing to a ground potential, is provided in order to cause a fuse to blow, in order to prevent a hazard to a user of the lamp. This effect is also ensured in the power supply control according to the present invention.
  • the amplitude and / or frequency selective device arranged in the protective conductor offers the power supply signal which is present on the protective conductor as a result of the short circuit , for example 230 V and 50 Hz, a negligible impedance.
  • the electrically conductive lamp housing for such a signal is still electrically connected to the ground potential. This continues to ensure the protective effect for a user.
  • a choke coil with an inductance of 100 mH can be used as the amplitude and / or frequency selective device.
  • Such a choke coil has a low impedance of approximately 2 ⁇ for a signal such as is used for the power supply of the illuminant 10.
  • a choke coil represents a large impedance for the output signal of the oscillator and thus decouples the output signal of the oscillator from the ground potential.
  • a diode or with, for example, a reverse voltage of 600 mV and a maximum current of 3 amps, or a Zener diode can be used as the amplitude and / or frequency selective device.
  • a diode is also effective in order to ensure the electrical connection between the lamp housing and the ground potential for the power supply signals, while the output signal of the oscillator is decoupled from the ground potential.
  • the polarity of the diode is not decisive for the protective effect achieved, the safety in the case a faulty connection between one of the conductors P and N and the lamp housing is guaranteed even if the diode is mistakenly inserted incorrectly into the circuit.
  • the circuit according to the invention also works for oscillator voltages which are greater than the threshold or breakdown voltage of the diode, for example in the order of magnitude of 2 V and above.
  • the reason for this is that a series connection of the coupling capacitors of the coupling device 16 and the diode forms a second artificial zero point, irrespective of the polarity of the diode, which is exactly at the threshold voltage of 600 to 700 mV from the earth conductor.
  • the amplitude of the oscillator swings around this artificial zero point.
  • the polarity of the diode only determines whether the artificial zero point has a more positive or negative potential than the protective conductor.
  • the artificial zero point for the oscillator frequency which is connected to the lamp housing, accordingly forms at the cathode or the anode of the diode.
  • this point follows the mains hum on the housing, but due to the polarity of the diode only in one half-wave.
  • the switching device 18 used can be, for example, a triac or a field effect transistor.
  • the switching device is electrically coupled to the evaluation circuit in any known manner in order to enable control of the switching device.
  • the fuses 20a and 20b provided in the conductors P and N serve as a further protective device.
  • These fuses preferably have a melting integral I 2 t, which is smaller than the permissible I 2 t of the diode, if a diode is used as an amplitude and / or frequency selective device.
  • I 2 t melting integral
  • Components which show a selective behavior with regard to the different signal properties of the power supply signals and the oscillator output signals can be used as the amplitude and / or frequency selective device, i.e. which have a low impedance for the power supply signals, while which they have a high impedance for the oscillator output signals.
  • the amplitude and / or frequency selective device must have a low impedance for the 230 V and 50 Hz supply power signal, while having a low amplitude and high frequency for the oscillator output signal compared to the frequency of the power supply signal represents a large impedance.
  • Using the power supply control according to the invention can thus be at least partially electrical conductive lamp housing can be used as a sensor element for manually adjusting the brightness of a lamp, even if the lamp meets the requirements of protection class 1 of the VDE guidelines.
  • the power supply control according to the present invention can be arranged both inside the lamp and built into the power supply cable of the lamp outside the lamp.
  • the arrangement is arranged inside the lamp, only the area in which the arrangement is located must be double-insulated. The rest of the lamp can be simply insulated in accordance with protection class 1.
  • the power supply control according to the present invention can, for example, be used together with a conventional touch control to replace a conventional dimmer, which among other things consists of a slider or a rotary potentiometer in the connecting line of a lamp.
  • a conventional touch control is described for example in WO 89 / 04110A1.
  • the evaluation circuit may be designed to respond to frequency changes in the oscillator output signal and / or to respond to amplitude changes in the oscillator output signal caused by a change in the load associated with the oscillator.
  • a triac can also be used as the amplitude and / or frequency selective device 22 according to the present invention, which is ignited in the event of an insulation fault and thus represents a low-resistance connection between the lamp housing and a ground line for the power supply signal. As a result, no dangerous voltage can occur on the lamp housing in the event of such an insulation fault.
  • a thy- ristor can be used.
  • FIG. 2 shows an exemplary embodiment of an amplitude and / or frequency selective device 22 which has two redundantly connected triacs. Thanks to the redundant use of two triacs, a reliable protective function can be guaranteed even if one triac fails.
  • two triacs 50 and 52 are connected in parallel between the lamp housing 12 (FIG. 1) and the ground potential to which the protective conductor S (FIG. 1) is connected.
  • the control line of the triacs is connected via two tens diodes, 54, 56 and 58, 60, to the lamp housing-side connection S 'of the amplitude and / or frequency-selective circuit.
  • the Zener diodes can be, for example, 6.2V / 500mW Zener diodes.
  • the evaluation circuit is coupled to S 'via the safety capacitor 16.
  • the AC line voltage and the oscillator frequency are capacitively coupled to S 'via the safety capacitor.
  • the amplitude is not yet limited. This causes an inductance 62 which, together with a series resistor 64, is connected in parallel with the two triacs between S and S '.
  • the inductance represents a low impedance for the mains AC voltage, but a very high one for the oscillator frequency of the touch control. This results in a frequency-dependent voltage divider.
  • the series resistor 64 is required to set a maximum divider ratio and to suppress the resonance of the resulting series resonant circuit, which consists of the inductor 62 and the capacitor 16.
  • the amplitude of the injected AC mains voltage on S ' is e.g. reduced to 4.5 V, while the amplitude of the coupled oscillator frequency remains unchanged.
  • the above wiring is necessary in order to enable an evaluation of a frequency change of the oscillator, because during this evaluation the safety circuit that is switched off the triacs 50, 52 and the zener diodes 54, 56, 58 and 60, must be high-resistance. This is ensured as long as the amplitude of the AC line voltage and the oscillator frequency at S 'remain below the breakdown voltage of the Zener diodes.
  • a downstream high-pass filter is also used in the evaluation circuit in order to pass only a changed oscillator frequency.
  • the high current flowing in the case of a low-resistance insulation fault thus triggers the miniature fuses 20a and 20b in the feed lines P and N. It is advantageous to ensure constructively that the I 2 t necessary to trigger the fuses is at most half as high as the permissible specified I 2 t of the triac used.
  • the voltage that arises at the lamp housing is limited to a value of, for example, 7.8 V.
  • the energy is dissipated via the triac, it just does not reach the value necessary for the holding current.
  • the triac does not go out when the mains half-wave ends or when one of the triggers is triggered two microfuses, but immediately after the malfunction ceases.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

L'invention concerne une unité de commande d'alimentation pour une lampe qui présente un élément lumineux (10) et un boîtier de lampe (12) au moins partiellement électroconducteur. Cette unité de commande comprend une première et une deuxième ligne (P, N) permettant d'appliquer un signal d'alimentation au moyen lumineux (10), lesdites lignes étant isolées par rapport au boîtier de la lampe. L'énergie électrique qui doit être appliquée au moyen lumineux (10) est commutée ou commandée au moyen d'un dispositif de commutation (18) situé dans la première ou la deuxième ligne (P, N). Un circuit de commande (14) présente un oscillateur et un circuit d'évaluation. L'oscillateur émet, à une sortie, un signal qui diffère en fréquence du signal d'alimentation et qui est couplé électriquement au boîtier de lampe (12). Le circuit d'évaluation réagit aux variations de fréquence et/ou d'amplitude du signal d'oscillateur, provoquées par le contact avec le boîtier de lampe (12), pour commander le dispositif de commutation (18). Un dispositif (22), également raccordé au boîtier de lampe au moins partiellement électroconducteur, est raccordé en outre un potentiel de la masse et représente une impédance élevée pour le signal d'oscillateur, tandis qu'il constitue une impédance faible pour le signal d'alimentation, par rapport à cette impédance élevée.
EP97940005A 1996-07-17 1997-07-17 Unite de commande d'alimentation pour une lampe Ceased EP0913072A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19628891A DE19628891C1 (de) 1996-07-17 1996-07-17 Leuchte mit Leistungsversorgungssteuerung für eine Lampe, die auf Berührung eines elektrisch leitenden Teils der Leuchte reagiert
DE19628891 1996-07-17
PCT/EP1997/003840 WO1998004104A1 (fr) 1996-07-17 1997-07-17 Unite de commande d'alimentation pour une lampe

Publications (1)

Publication Number Publication Date
EP0913072A1 true EP0913072A1 (fr) 1999-05-06

Family

ID=7800113

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97940005A Ceased EP0913072A1 (fr) 1996-07-17 1997-07-17 Unite de commande d'alimentation pour une lampe

Country Status (4)

Country Link
US (1) US6075356A (fr)
EP (1) EP0913072A1 (fr)
DE (1) DE19628891C1 (fr)
WO (1) WO1998004104A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2778305A1 (fr) * 1998-04-30 1999-11-05 Jean Jacques Hirsch Interrupteurs electriques
US6452494B1 (en) * 1999-09-27 2002-09-17 Intel Corporation Activating devices
SE518662C2 (sv) * 2001-04-27 2002-11-05 Lars Aake Wern Elektrisk strömställare innefattande en kapacitiv sensorkrets
CN101803469B (zh) * 2007-09-20 2013-07-24 奥斯兰姆有限公司 用于驱动至少一个放电灯的电子驱动装置
CN106422342B (zh) * 2016-11-25 2022-04-29 广东哈一代玩具股份有限公司 一种钢琴节奏玩具熊及使用该玩具熊的方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3171066A (en) * 1960-07-05 1965-02-23 Tung Sol Electric Inc Touch control circuits
CA1203007A (fr) * 1983-07-06 1986-04-08 Dale B. Williston Dispositif de mise a la terre
US4701676A (en) * 1985-12-18 1987-10-20 Gibson John A Touch control adaptor
DE3736222A1 (de) * 1987-10-26 1989-05-03 Ingo Maurer Schaltungsanordnung zum steuern der helligkeit einer lampe
DE3806486A1 (de) * 1988-03-01 1989-09-14 Siegfried Friedrich Irion Gluehlampe, insbesondere tischlampe

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9804104A1 *

Also Published As

Publication number Publication date
US6075356A (en) 2000-06-13
DE19628891C1 (de) 1997-07-17
WO1998004104A1 (fr) 1998-01-29

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