EP1031258A1 - Schnittstelle für ein lampenbetriebsgerät - Google Patents
Schnittstelle für ein lampenbetriebsgerätInfo
- Publication number
- EP1031258A1 EP1031258A1 EP98952717A EP98952717A EP1031258A1 EP 1031258 A1 EP1031258 A1 EP 1031258A1 EP 98952717 A EP98952717 A EP 98952717A EP 98952717 A EP98952717 A EP 98952717A EP 1031258 A1 EP1031258 A1 EP 1031258A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- interface device
- control
- voltage
- inverter
- lamp
- 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.)
- Granted
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
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
- H05B41/2825—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a bridge converter in the final stage
- H05B41/2828—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a bridge converter in the final stage using control circuits for the switching elements
-
- 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
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/36—Controlling
- H05B41/38—Controlling the intensity of light
- H05B41/39—Controlling the intensity of light continuously
- H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
- H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
Definitions
- the present invention relates to an interface device for a lamp operating device according to the preamble of claim 1 and an electronic ballast for gas discharge lamps or an electronic transformer for halogen lamps with a corresponding interface device.
- the electronic ballast shown in FIG. 3 schematically shows the structure of a known electronic ballast for operating a gas discharge lamp 10, control signals a for dimming the electronic ballast or the gas discharge lamp 10 connected to it being supplied to the electronic ballast via an interface 1.
- the electronic ballast shown in FIG. 3 comprises a rectifier 4 and an inverter 5, in the load circuit of which the gas discharge lamp 10 is arranged.
- the rectifier 4 converts that from a supply voltage source, e.g. a mains voltage source, converted AC voltage into a rectified DC link voltage, which is fed to the inverter 5.
- the inverter 5 typically comprises two controllable switches (not shown) connected in series, e.g.
- MOS field effect transistors which are alternately driven by the rectified intermediate circuit voltage, so that one of the switches is always on when the other switch is off.
- An output connection of the inverter 5 is connected on the one hand to the connection point between these two alternately controlled switches and on the other hand to a series resonance circuit consisting of a coil 6 and a capacitor 7, the capacitor 7 of the series resonance circuit being connected in parallel to the gas discharge lamp 10 via a coupling capacitor 8.
- the alternating activation of the switches of the inverter 5 generates a clocked, ie “chopped”, high-frequency alternating voltage on the output side of the inverter 5, which serves as the operating voltage for the gas discharge lamp 10.
- the output frequency of the inverter 2 becomes close to the resonance frequency of the series resonance circuit with the coil 6 and the capacitor 7, so that a voltage surge occurs at the capacitor 7, which ultimately leads to the ignition of the gas discharge lamp 10.
- a heating transformer with a primary winding 9A and secondary windings 9B and 9C can be provided, the primary winding 9A being connected to the series resonant circuit, while the secondary windings 9B and 9C are each connected to one of the lamps spiral are connected in parallel.
- the interface 1 of the lamp operating device shown in FIG. 3 is designed as an analog 1-10V interface.
- the external control signals received by the interface 1 are fed directly to a control unit 2 of the electronic ballast via an appropriately designed input transformer of the interface 1, the control unit 2 e.g. controls a bridge driver 3 of the inverter 5.
- the interface automatically sets a minimum dimmer, for example corresponding to IV, so that basically control voltages ⁇ IV have no direct influence on the dimming process, since they are regarded as an IV control voltage.
- the control unit 2 controls, for example, the bridge driver 3 in such a way that it changes the frequency or the duty cycle of the alternating voltage supplied by the inverter 5 by switching the on and off times of the two inverter switches connected to a full or half bridge Inverter 5 can be varied accordingly.
- the known interface 1 shown in FIG. 3 is not able to receive switch-on and / or switch-off commands and to forward them accordingly to the electronic ballast, i.e. the electronic ballast cannot be switched on and / or off via interface 1.
- the conventional interface 1 it is necessary to switch the lamp operating device on and off via the mains cable.
- this requires the use of additional relays, since the high starting currents must be taken into account, especially when switching on via the mains cable. This results in a significantly higher wiring and installation effort, with the individual relays also having to be dimensioned accordingly to ensure reliable switching on and off.
- the present invention is therefore based on the object of providing an interface device for a lamp operating device which enables the electronic ballast to be switched on and / or off more easily without the additional circuitry mentioned above.
- This object is achieved according to the present invention by an interface device with the features of claim 1.
- the interface according to the invention is used according to claim 22 in an electronic ballast for gas discharge lamps or according to claim 23 in an electronic transformer for halogen lamps.
- the interface device is designed in such a way that it evaluates a received control signal and, depending on the received control signal, in particular depending on its amplitude, controls the operation of a lamp operating device connected to the interface device.
- the control signals received are not simply transmitted or forwarded to the electronics of the lamp operating device, but the interface evaluates the control signal present.
- the interface advantageously either converts the control signal into corresponding dimming information for the lamp operating device or causes the lamp operating device to be switched on or off.
- the amplitude of the received control signal is evaluated in particular by the interface device according to the invention, the interface device switching off the connected lamp operating device if the amplitude of the received control signal is below a predetermined amplitude limit value.
- the interface device according to the invention is advantageously designed as a 0-10V interface, the interface switching off, for example, the inverter of the lamp operating device connected to it when there is a control signal with an amplitude less than IV.
- the known interface shown in FIG. 3 uses an internal control unit for control signals with an amplitude a minimum dimming value for the lamp operating device or the gas discharge lamp connected to it is always set below IV.
- the interface according to the invention is advantageously designed and connected in such a way that it is supplied with energy from the control voltage of the external control signal present at the interface during the start of the lamp operating device connected to it or during a standby mode, the interface, for example, a current of maximum 2 mA is supplied.
- the stand-by losses can be kept very low, since the interface or its electronic components are only supplied with power from correspondingly provided internal power supply means when changing from stand-by mode to operating mode.
- the control voltage of the external control signal present is advantageously evaluated with the aid of a microcontroller which generates corresponding dimming target information as a function of the external control signal present, the microcontroller, for example, preferably converting the analog control signals into pulse-width-modulated signals or into digital control words which correspond to the dimming target information.
- the dimming curve can be adapted to the sensitivity of the human eye.
- the human eye is not linearly sensitive. This non-linearity is approximately logarithmic.
- the use of a linear dimming curve for a desired brightness would not cause a corresponding linear brightness sensation in the human eye. For example, starting from a predefined brightness, the impression of human brightness is doubled by quadrupling the electrical light output.
- the microcontroller can be designed in such a way that it converts the external control signal or the dimming control values contained therein into a pulse-width-modulated dimming setpoint information according to a logarithmic dimming curve, which is finally output on the output side by the interface and in a lamp operating device connected to the interface for dimming the in turn connected to it Lamp can be used. Furthermore, the use of a microcontroller increases the operational reliability of the interface, since malfunctions or temperature drifts are not critical in this case
- the pulse-width-modulated signal from the microcontroller can advantageously be further processed both analog and digital.
- the interface according to the invention can be connected both to lamp operating devices with externally controlled or positively controlled inverter switches (which are controlled, for example, using an ASIC as a control unit) and to lamp operating devices with self-controlled or freely oscillating inverter switches (which are controlled by control transformers).
- Fig. 3 shows an example of the schematic structure of an electronic ballast with an interface for receiving external control signals, the interface according to the invention can be connected in an analogous manner to the electronic ballast.
- the interface 1 shown in FIG. 1 essentially consists of an input circuit 20, a control circuit 30, an output circuit 40 and a power supply circuit 50.
- the input circuit 20 is connected directly to the output circuit 40 via a controllable switch 60.
- the input circuit 20 comprises connections A, B which receive external control signals a. These external control signals a can be, in particular, analog dimming signals.
- a diode 21 serves as input-side protection of the subsequent circuit components against voltage and incorrect polarity.
- the input circuit 20 comprises two resistors 22 and 23 and a capacitor 24, so that these components serve as a voltage divider and low-pass filter for the A / D converter of a microcontroller 31 present in the control circuit 30. This way, a low-resistance input resistance for the microcontroller and a low-pass behavior are achieved, which improves interference suppression.
- the control circuit 30 comprises - as has already been mentioned - the microcontroller 31 as an essential component. Diodes 32 and 33 and a capacitor 34 are used to generate a stable supply voltage for the microcontroller 31. To operate the microcontroller 31 there are resistors 35, 37 and 38 and a capacitor 36 is connected to the microcontroller 31 as shown in FIG. 1.
- the output circuit comprises an optocoupler 41 and output connections C, D, the output signal of the optocoupler 41 being fed to the output connections C D via a resistor 42.
- the actual electronics of a lamp operating device, in particular an electronic ballast, are connected to the connections C, D of the output circuit 40, so that - as shown in FIG. 3 - the output circuit 40 has, for example, a control unit 2 of the electronic ballast for controlling the inverter 5 of the electronic ballast is connected.
- the power supply circuit 50 serves as an energy source for the entire interface 1 and in particular for the microcontroller 31.
- the power supply circuit 50 has input connections E, F to which an input voltage is applied.
- the input voltage can in particular be an internal supply voltage of the electronics of an electronic ballast connected to the output circuit 40, such as an inverter voltage, or the (AC) voltage for controlling the half-bridge of the inverter.
- This input voltage is fed via a capacitor 51 to an insulation transformer 52 with a primary winding 52A and two secondary windings 52B, 52C.
- the actual supply voltage -V B or + V B occurs at the output connections of the secondary windings 52B, 52C and is provided via diodes 56 or 53 at output connections G, H of the power supply circuit 50.
- the capacitors 57 and 58 serve as buffers for the voltage supply.
- the resistors 54, 55 and 59, as will be described in more detail below, together with the resistor 42 of the output circuit 40 ensure that the voltage -V B is built up delayed to the voltage + V B , in order to ensure that the start-up phase is timed correctly To ensure power supply.
- the supply voltage + V B is applied to an input terminal I of the control circuit 30 and serves as the actual supply voltage for the microcontroller 31.
- the supply voltage -V B is at the controllable switch 60 shown in FIG. 1 applied, wherein according to this embodiment, the controllable switch 60 is designed as an n-channel junction field effect transistor.
- the function of the interface shown in Fig. 1 is as follows, starting from the assumption that interface 1, i.e. the microcontroller 31 has not yet been activated and the lamp operating device connected to the output connections C, D of the output circuit 40 has not yet been switched on.
- a (control) voltage ie a control signal a
- a current flows into the optocoupler 41 via the junction field-effect transistor 60, since in the initial state, the supply circuit 50 does not yet generate a supply voltage -V B and thus the junction field effect transistor 60 is initially conductive.
- neither the supply voltage -V B nor the supply voltage + V B occurs at the output connections G, H of the power supply circuit 50, since, due to the switched-off state of the electronics of the lamp operating device, there is no input voltage at the input connections E, F of the power supply circuit 50.
- the interface 1 is supplied solely with energy from the control voltage of the control signal a, the interface 1 being supplied with a current of at most 2 mA, for example.
- the interface according to the invention is designed in such a way that the interface 1 only in the operating case, i.e. after activation of the power supply circuit 50 and the microcontroller 31, is supplied with current from the isolation transformer 52 of the power supply circuit 50. This means that standby losses can be kept very low.
- the junction field effect transistor 60 is conductive during this switch-on or start-up phase, so that the input circuit 20 is switched through and connected to the output circuit 40 or its optocoupler 41 via a current-limiting resistor 61. Due to the current thus supplied to the optocoupler 41, a signal is generated on the output side of the optocoupler 41, which signal is supplied on the output side via the connections C, D analogously to FIG. 3 to a control unit or a bridge driver of the inverter of the lamp operating device connected to the output circuit 40, so that the inverter can start to vibrate as a result of this signal.
- an input voltage occurs at the input connections E, F of the power supply circuit 50, so that the current or voltage supply of the interface 1 or of the Microcontrollers 31 can run up.
- the supply voltage + V B builds up faster than the supply voltage -V B due to the resistors 54, 55 59 and 42. This has the effect that the supply voltage + V B has already been supplied to the microcontroller 31 via the connections H and I, and the microcontroller 31 is already supplied with a stable supply voltage and has started up when the supply voltage -V B at the output connection G of the power supply circuit 50 occurs, which leads to the blocking of the junction field effect transistor 60.
- the microcontroller 31 When the supply voltage + V B is applied to the control circuit 30, the microcontroller 31 is activated and, depending on the control signals a present, generates corresponding dimming setpoint information which is supplied to the optocoupler 41 as the aforementioned control signals b, the microcontroller 31 depending on the dimming setpoint information Control signal a generated in the form of a pulse width modulated signal.
- These pulse-width modulated signals b are fed via the optocoupler 41 and the output connections C, D to the output circuit 40 of the electronics of the electronic ballast connected to it, so that, as shown for example in FIG.
- a corresponding control unit 2 depends on the pulse-width-modulated dimming information b
- Bridge driver 3 of the inverter 5 in the electronic ballast can be activated accordingly in order to dim a gas discharge lamp 10 connected to the electronic ballast in accordance with the control signal a or the pulse-width-modulated dimming setpoint signal b by changing the frequency or duty cycle of the inverter 5.
- the interface 1 shown in FIG. 1 is designed, for example, as a 0-10 V interface.
- the interface 1 is designed in such a way that it not only generates dimming setpoint signals b as a function of externally applied control signals a, but also enables the electronic ballast connected to the connections C, D to be switched on and / or off via the interface itself.
- the switching on of the electronic ballast is selectively preferably determined by the output circuit 40, the optocoupler 41 being dimensioned and designed such that it only signals for input voltages greater than IV to the output connections C, D forwards.
- the microcontroller 31 After switching on the electronic ballast and thus activating the microcontroller 31 via the power supply circuit 50, the microcontroller 31 continuously monitors the amplitude of the control signal a via its input connection AN2 and only generates corresponding dimming setpoint information b at its output connection ANO if the amplitude of the control signal a is sufficient is great. Obviously, 1 volt could be used as the limit value. However, in order to compensate for environmental influences or voltage fluctuations, the microcontroller 31 causes the lamp operating device connected to the connections C, D to be switched off, taking into account a hysteresis, so that, for example, a voltage of 0.4-0.5 V is used as the limit value for switching off the lamp operating device can.
- the control signal a is evaluated as a function of the software programming of the microcontroller 31.
- the shutdown of the operating device connected to the connections C, D can be brought about, for example, by the microcontroller 31 in that if the amplitude of the control signal a drops below that previously described Amplitude limit value no more dimming setpoint information b are generated at the output ANO of the microcontroller 31, so that correspondingly no signals are transmitted to the electronic ballast via the optocoupler 41, which is accordingly interpreted by the control unit 2 of the electronic ballast shown in FIG. 3 as a shutdown command can.
- the microcontroller 31 immediately sends a correspondingly coded pulse-width-modulated command via the optocoupler 41 to the control unit 2 of the electronic ballast.
- a lamp operating device connected to the connections C, D can be switched almost without power via the interface 1 according to the invention, so that in addition to the usual dimming, the lamp operating device can also be switched on and off via the interface 1 is possible.
- the interface 1 is in particular designed such that the lamp operating device depends on the amplitude of the control signal a present at the interface 1 is either dimmed or switched on or off.
- FIG. 2 shows a second exemplary embodiment of the interface according to the invention, corresponding components being provided with the same reference numerals.
- the power supply circuit 50 has a simplified structure and generates a supply voltage + V B only at the output connection H as a function of an input voltage present at the input connections E, F via the isolation transformer 52 and the diodes 53, 56. Furthermore, instead of the n-channel junction field effect transistor 60 shown in FIG. 1, the npn bipolar transistor 60 is connected to the optocoupler 41 of the output circuit 40, but the optocoupler 41 is connected directly to the input circuit 20, ie without the interposition of a switch.
- the bipolar transistor 60 is controlled on the input side by the microcontroller 31, which in turn generates corresponding dimming setpoint information b in pulse-width-modulated form at its output AN1 as a function of the control signal a and supplies it to the base of the bipolar transistor 60 via the resistor 38.
- the startup of the interface or the power supply circuit 50 takes place analogously to the circuit shown in FIG. 1, ie when a voltage a occurs at the input connections A, B, a current flows directly from the input circuit 20 into the optocoupler 41, which generates a signal on the output side , which is fed via the connections C, D to a lamp operating device connected to it and thus brings about the switching on of the lamp operating device.
- the input voltage branched off from the lamp operating device at the connections E, F consequently leads to the generation of the supply voltage + V B on the output side, which enables the microcontroller 31 to start up.
- the microcontroller 31 As soon as the microcontroller 31 has started up, it generates a corresponding pulse-width-modulated dimming signal b, which corresponds to the desired setpoint for the dimming of the lamp operating device connected to the connections C, D or the lamp connected to it, depending on the control signal a present at its input connection AN2. With the occurrence of the signal b at the base of the bipolar transistor 60, the potential present at the collector of the bipolar transistor 60 is continuously pulled to ground, so that only the dimming setpoint value information b is supplied to the optocoupler 41 and thus the connection between the output circuit 40 and the input circuit 20 is deactivated or made ineffective. In addition, two additional diodes 62 and 63 are shown in broken lines in FIG.
- One diode 62 is connected in series with the resistor 61, while the other diode 63 is connected on the one hand to the supply voltage + V B and on the other hand to the diode 62.
- the optocoupler 41 With the help of the diodes 62 and 63 it can be ensured that the optocoupler 41 is supplied by the supply voltage + V B as soon as it has built up.
- the optocoupler 41 thus switches through even with a small interface input voltage, so that a lamp operating device connected to the connections C and D can be reliably switched off even with small input voltages.
- the standard high-voltage strength of 1500 V between the control circuit and the network side is ensured with the aid of the insulation transformer 52 and the optocoupler 41.
- the microcontroller 31 can be programmed such that it determines the corresponding dimming setpoint value information b for the electronic ballast as a function of a logarithmic dimming curve depending on the amplitude of the control signal applied to it on the input side, in order to adapt the dimming to the actual human eye sensitivity .
- the interface according to the present invention can be used in an electronic ballast for gas discharge lamps.
- Use in an electronic transformer for halogen incandescent lamps is also possible, the electronic transformer likewise having an inverter supplied with a rectified voltage, which generates a high-frequency AC voltage.
- an electrical transformer does not have a series resonance circuit, but rather an output transformer which is connected between the inverter and at least one halogen incandescent lamp to be controlled. The AC voltage generated by the inverter is thus present at the primary winding of the output transformer, while at least one halogen incandescent lamp is connected to the secondary winding (s) of the output transformer.
Landscapes
- Discharge-Lamp Control Circuits And Pulse- Feed Circuits (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19748007 | 1997-10-30 | ||
DE19748007A DE19748007A1 (de) | 1997-10-30 | 1997-10-30 | Schnittstelle für ein Lampenbetriebsgerät |
PCT/EP1998/006612 WO1999023858A1 (de) | 1997-10-30 | 1998-10-19 | Schnittstelle für ein lampenbetriebsgerät |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1031258A1 true EP1031258A1 (de) | 2000-08-30 |
EP1031258B1 EP1031258B1 (de) | 2003-01-29 |
Family
ID=7847143
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP98952717A Expired - Lifetime EP1031258B1 (de) | 1997-10-30 | 1998-10-19 | Schnittstelle für ein lampenbetriebsgerät |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP1031258B1 (de) |
AT (1) | ATE232041T1 (de) |
AU (1) | AU1030699A (de) |
DE (2) | DE19748007A1 (de) |
WO (1) | WO1999023858A1 (de) |
ZA (1) | ZA989827B (de) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6333605B1 (en) | 1999-11-02 | 2001-12-25 | Energy Savings, Inc. | Light modulating electronic ballast |
DE10329876B4 (de) * | 2003-07-02 | 2016-06-02 | Tridonic Gmbh & Co Kg | Schnittstelle für ein Lampenbetriebsgerät mit niedrigen Standby-Verlusten und Verfahren zur Ansteuerung eines Lampenbetriebsgeräts über eine derartige Schnittstelle |
US7619539B2 (en) | 2004-02-13 | 2009-11-17 | Lutron Electronics Co., Inc. | Multiple-input electronic ballast with processor |
DE102004050655A1 (de) | 2004-10-18 | 2006-06-01 | Volkswagen Ag | Fahrzeug-Beleuchtungsvorrichtung und Verfahren zum Steuern einer Fahrzeug-Beleuchtungsvorrichtung |
US7369060B2 (en) | 2004-12-14 | 2008-05-06 | Lutron Electronics Co., Inc. | Distributed intelligence ballast system and extended lighting control protocol |
DE102005018774A1 (de) * | 2005-04-22 | 2006-10-26 | Tridonicatco Gmbh & Co. Kg | Einstellbare digitale Leuchtmittelleistungsregelung |
US7446488B1 (en) * | 2007-08-29 | 2008-11-04 | Osram Sylvania | Metal halide lamp ballast controlled by remote enable switched bias supply |
US7932682B2 (en) | 2008-06-30 | 2011-04-26 | Osram Sylvania, Inc. | Internal power supply for a ballast |
DE102010036444B4 (de) * | 2010-07-16 | 2012-03-22 | Vossloh-Schwabe Deutschland Gmbh | Verfahren und Vorrichtung zum Dimmen eines Leuchtmittels mithilfe eines Mikrocontrollers |
DE102010043613A1 (de) * | 2010-11-09 | 2012-05-10 | Tridonic Gmbh & Co. Kg | Störsichere Leuchtmittelsteuerung |
DE102019208960A1 (de) * | 2019-06-19 | 2020-12-24 | Ellenberger & Poensgen Gmbh | Verfahren zum Betrieb eines Dimmers |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3345559A1 (de) * | 1983-12-16 | 1985-06-20 | Messerschmitt-Bölkow-Blohm GmbH, 8012 Ottobrunn | Dimmung einer leuchtstofflampe und vorschaltgeraet mit einer einrichtung zum dimmen |
DE4039161C2 (de) * | 1990-12-07 | 2001-05-31 | Zumtobel Ag Dornbirn | System zur Steuerung der Helligkeit und des Betriebsverhaltens von Leuchtstofflampen |
US5691605A (en) * | 1995-03-31 | 1997-11-25 | Philips Electronics North America | Electronic ballast with interface circuitry for multiple dimming inputs |
-
1997
- 1997-10-30 DE DE19748007A patent/DE19748007A1/de not_active Ceased
-
1998
- 1998-01-28 ZA ZA989827A patent/ZA989827B/xx unknown
- 1998-10-19 AT AT98952717T patent/ATE232041T1/de not_active IP Right Cessation
- 1998-10-19 DE DE59807092T patent/DE59807092D1/de not_active Expired - Lifetime
- 1998-10-19 EP EP98952717A patent/EP1031258B1/de not_active Expired - Lifetime
- 1998-10-19 WO PCT/EP1998/006612 patent/WO1999023858A1/de active IP Right Grant
- 1998-10-19 AU AU10306/99A patent/AU1030699A/en not_active Abandoned
Non-Patent Citations (1)
Title |
---|
See references of WO9923858A1 * |
Also Published As
Publication number | Publication date |
---|---|
ZA989827B (en) | 1999-05-04 |
AU1030699A (en) | 1999-05-24 |
DE19748007A1 (de) | 1999-05-12 |
WO1999023858A1 (de) | 1999-05-14 |
EP1031258B1 (de) | 2003-01-29 |
ATE232041T1 (de) | 2003-02-15 |
DE59807092D1 (de) | 2003-03-06 |
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