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
  • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
  • H05B45/40—Details of LED load circuits
  • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
  • H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
• • 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
  • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
  • H05B45/40—Details of LED load circuits
  • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
  • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines

Definitions

• the field of the present invention relates to lighting devices. It relates particularly, but not exclusively, to the field of control method of a set of electronic components comprising at least two subsets of electronic components each comprising at least one electronic component such as light emitting diodes.
• the electronic components forming the lighting device have tolerances of the order of 1% to 5% on their electrical characteristics according to their states of wear and their manufacturing processes.
• the majority of electronic components have a very different operating range and yields between them. Therefore, the industry has implemented a method of evaluating these errors.
• this evaluation comes under a tolerance range that does not allow developers to guarantee a point of operation of the device.
• These tolerance ranges become very troublesome when the current is directly dependent on the voltage on the one hand and on the other hand when the current has to be confined in a relatively narrow operating range as is the case for light-emitting diodes (for example). subsequently called LEDs).
• Another solution would be to test the electronic components directly when making the device in the factory.
• the aging of electronic components would inevitably lead to a drift measured values and therefore poor calibration of the different electronic modules.
• the present invention aims to solve totally or partially the disadvantages mentioned above.
• the present invention relates to a method for controlling a set of electronic components comprising at least two subsets of electronic components each comprising at least one electronic component electrically connected to a source of electrical energy supplying a voltage value.
• control method comprising the steps of: obtaining a table of reference values comprising, at least one subset, at least one switching time value, and at least one supply reference value; sequentially feeding at least a first subset and a second subset according to the power reference values and the switching time values; the supply of at least one subset being performed by an analog signal value as a function of the power reference value associated with the subset of electronic components supplied in a period of time between two successive switching times; measuring an operating value generated by the generated signal value characteristic of the subset of powered electronic components; measuring the operating value generated by the characteristic generated signal value of the subset of electronic components; and adjusting said at least one reference value and / or said at least one switching time as a function of the measured operating value.
• the control method allows the set of electronic components to obtain an optimal operating point without the developer having to take into account the tolerance ranges.
• the control method may further have one or more of the following characteristics taken alone or in combination.
• the generated analog signal value is proportional to the voltage value of the electrical power source.
• the analog signal in the form of a continuous value set as a function of time, comprises a continuous slope change and / or a value gradient.
• the analog signal does not have a measurement jump, which could lead to excessive current draw for electronic components and in particular for the LEDs. Indeed, an excessive analog signal could cause a deterioration of the technical characteristics of the LEDs.
• the adjusted signal value qualified as a signal value is set up so that the measured operating value reaches the nominal operating value asymptotically.
• the adjusted signal value does not exceed the technical characteristics of the electronic components which could deteriorate LEDs themselves.
• the adjustment step comprises the following steps: establishing the characteristic difference of the subset of the group of electronic components supplied between the measured operating value and a nominal operating value of the group subset electronic components powered; establishing a signal value adjusted according to the established difference.
• the adjusted signal value is closer to the actual technical characteristics of the electronic components.
• the adjusted signal value qualified as a reference signal value reduces the difference between the measured operating value and the nominal operating value to zero.
• the adjusted signal value corresponds to the actual technical characteristics of the electronic components.
• the measurement of the generated operating value comprises the following steps: - verification of the operating value generated with a zero operating value; and, confirming the correspondence between the operating value generated with a zero operation value.
• the method can detect a switching time value because it does not correspond to the technical characteristics of the electrical components.
• the correspondence confirmation step allows adjustment of the switching time value of the analog signal value.
• the method can adjust the switching instant value so that it corresponds to the technical characteristics of the electrical components.
• the measurement of the generated operating value comprises a step which checks whether the generated operating value is greater than the nominal operating value and supplies all the electronic components if the operating value generated is greater than the value. nominal operation.
• the subset of electronic components representing all the LEDs uses the energy of the fast surge by emitting light.
• control method comprises a step of applying an attenuation coefficient to the reference value table after receiving a control signal transmitted by a monitoring and / or communication element.
• control method can adapt the brightness of the lighting system and at the same time consume less energy.
• control method comprises a step of saving the set of electronic components by supplying the set of electronic components only when all the electronic components can be powered so as to decrease the heating of the electronic components during the process. supply of subsets of electronic components.
• control method makes it possible to reduce the heating of the electronic components by making them work only over a very short period.
• each of the values of a switching time value, the power reference value comprises a lower limit and an upper limit.
• control method comprises a step of initializing the table of reference values prior to the step of obtaining the table of reference values.
• certain parameters can be updated if necessary.
• the initialization step of the array initializes the reference values with default values.
• the control method can return to its state at the factory outlet.
• the analog signal value comprises a continuous slope and / or a gradient of values.
• the adjusted signal value approximates the technical characteristics of the electronic components while preserving them.
• FIG. 1 represents an example of a lighting system in which a supply stage 101 is set artwork ;
• Figure 2 shows an example of control stage 102;
• Figure 3 illustrates an example of controlled stage 102 according to one embodiment;
• Figure 4 shows an example of a control method according to one embodiment.
• FIG. 1 shows a circuit of a lighting system serving to supply a set of electronic components EN comprising at least two subsets of electronic components SE each comprising at least one electronic component electrically connected to a source of electrical energy ES .
• the lighting system comprises several stages such as a feed stage 101, a control stage 102 and a controlled stage 103.
• the supply stage 101 supplied to the control stage 102 and the controlled stage 103 the energy necessary to allow their power supplies. This energy may be in the form of a direct current DC or an alternating current AC.
• the controlled stage 103 adapts as a function of the input current and whatever the nature of the input current, that is to say alternating or continuous, thanks to the cooperation of the stage d supply 101 with control stage 102.
• transile diodes 125 or more commonly referred to as Transient Voltage Suppression Diode (TVS).
• TVS Transient Voltage Suppression Diode
• This overvoltage protection 125 makes it possible to pass the overvoltages between the phase L1 and the neutral N, in some cases and in other cases between the phase L1 or the neutral N and the earth (not represented) so as to evacuate, either by the neutral N or by the earth (not shown), the overvoltages which could damage the circuit downstream of the transile diodes 125.
• a rectifier 127 placed after the overvoltage protection 125.
• This rectifier 127 typically a diode bridge 127, makes it possible to rectify the alternating current AC.
• the diode bridge 127 can be likened to an absolute function in mathematics, that is to say that in the case of an AC current having the shape of a sine input, the diode bridge 127 will give its absolute value as V * sin ( ⁇ j I with V for the voltage, t for the time and T for the period.) The same goes for the DC current, that is to say that little whatever the polarity of the connection of the source to the circuit, the current will always be positive after the diode bridge 127.
• a capacitive filter 129 is arranged after the diode bridge 127 to filter the voltage to the subsets of electronic components SE.
• the supply stage 101 feeds through a current antirust protection system 133, typically a diode accompanied by a filter comprising a set of capacitors and a coil, a control stage 102 comprising a microcontroller 111 shown on FIG. FIG. 2.
• This microcontroller 111 is supplied with direct current DC by means of a power supply module 131, belonging to the supply stage 101, in direct current DC.
• This power supply module 131 comprises a series chopper 140, a diode 141 for maintaining the voltage at a certain voltage, a coil 142 for smoothing the voltage and storing energy and a capacitor 143 or a capacitor assembly 143 also for storing energy and for restoring it when the series chopper 140 at a high impedance preventing the current from passing.
• FIG. 2 shows the control stage.
• the microcontroller 111 is configured to communicate, through a galvanic isolation 137, with external elements such as for example a central unit (not shown) with the aid of a communication unit 135, for example an interface chip able to communicate in series.
• the galvanic isolation 137 generally has two optocouplers 137: one for the transmission of data via the communication unit 135 to a central unit (not shown) and the other for the reception of data from the central unit (not shown) and received by the communication unit 135.
• the control stage 102 evaluates the current flowing through the controlled stage 103 by means of a resistive element 119, represented in FIG. 3.
• the resistive element 119 may comprise a set of connected resistors. in parallel so as to decrease the overall resistance. This also makes it possible to reduce the voltage at the terminal of the resistive member 119 and at the same time the voltage at the terminal of the microcontroller 111.
• the current flowing through the controlled stage 103 and evaluated using a resistive member 119 is converted. by Analog / Digital input ⁇ (in English Analogue Digital Converter) so as to give a numerical value to the measured signal.
• the microcontroller 111 is allowed to measure an operating value MV associated with the subset of electronic components SE, that is to say by measuring the current flowing in the subassemblies, and to adapt the current of supply of the controlled stage 103 more precisely the control stage 102 adapts the supply current of the set of electronic components EN, in other words LEDs.
• This current adaptation is effected by using the Digital Analog Converter (Digital Digital Analog) output producing an analog signal value ASV, which can be proportional to the voltage value of the electric power source ES and serving to control a voltage.
• element of This analog signal value ASV is analogically modulated so as to control the current flowing through the control element 139 between its collector c and its emitter e.
• This current that is to say the current flowing through the control element 139, allows the gradual supply of the base of the bipolar transistors represented by the switches 121, from a DC voltage VCC.
• the microcontroller 111 can gradually manage, via the analog signal ASV, the supply of the switches 121 and thus vary the current flowing through the subset of electronic components by putting one of the bases b bipolar transistors representing the switch 121 to ground through one of the inputs ⁇ , ⁇ , e, ⁇ or ⁇ .
• the switching point ST does not correspond to the subset of electronic components supplied with power, in other words the switching instant ST intervenes too early. Therefore, it is necessary to adjust the switching time ST so that the operating value MV is different from zero. Another reason for this zero operation value could be that the actual LED parameters have changed. In which case, it will also be necessary to adjust the switching instant ST.
• the set of electronic components EN comprises at least two subsets of electronic components SE and according to the value of the switching instant ST, the control method PC, according to the invention, controls the connection of the number of sub-assemblies of electronic components SE so as to adapt the number of subsets of electronic components SE to feed.
• the PC control method implements an initialization step INIT of an array of reference values RT.
• the reference value table RT comprises at least one subset, at least one switching instantaneous value ST, and at least one reference value of feeding RV.
• the ST switching time value is optionally set between a lower limit ST L and an upper limit ST H and indicates when the microcontroller 111 should gradually supply the intensity of the switches 121 so as to allow the supply of the subsets. of SE electronic components as a function of time.
• the reference value of power supply RV is optionally defined between a lower limit RV L and an upper limit RV H and makes it possible, for its part, to know the set of electronic components EN to feed or more exactly, the reference value of RV supply makes it possible to know the number of subassemblies of electronic components EN to supply according to the input voltage of the lighting system.
• This power reference value RV is the reference of the analog signal value ASV, in other words, the reference value RV power is in the memory of the microcontroller 111 and the latter, that is to say that is, the microcontroller 111 produces an analog signal value ASV, via its Digital / Analogue output, so as to control the control element 139.
• the microcontroller 111 through the resistive device 119, the operating point MV, generated by the analog signal value ASV, of the set of electronic components supplied.
• the method can adapt the value of switching time ST or the reference value of power supply RV, included in the table of reference values RT, an attenuation coefficient AC as a function of the reception of control signals transmitted by a monitoring and / or communication unit MoCD so as to measure a decrease in the MV operating point.
• This reduction of the operating point MV is carried out by the microcontroller 111 by applying an analog signal value ASV, typically a current, proportional to the attenuation coefficient AC, to the base b of a transistor 121 so as to let the current flow attenuated through transistor 121 between collector c and emitter e.
• ASV analog signal value
• ASV typically a current, proportional to the attenuation coefficient AC
• control signals emitted by a monitoring and / or communication unit MoCD
• a communication bus electrically isolated from the microcontroller 111.
• the PC control method can attenuate the operating point MV of the device by applying an attenuation coefficient AC to all the analog signal values.
• the brightness in the space concerned is adjusted.
• the monitoring member MoCD can detect an anomaly such as overheating of the electrical components.
• the MoCD monitor can also be integrated into the lighting system.
• the PC control method triggers a SAVE backup step by limiting the power supply of the electronic component set EN only when all the electronic components can be powered so as to decrease the warming of the electronic components during the power supply. subsets of electronic components SE.
• the PC control method triggers the SAVE save step when the RV power reference value can power all subsets of SE electronic components.
• a disturbance can occur through the source of electrical energy.
• a voltage divider 126 typically a set of resistors 126 included in the power stage 101, informs the microcontroller 111 of the disturbance.
• This disturbance may be in the form of a fast SRG overvoltage.
• the control method receives the information that a fast overvoltage SRG propagates in the electrical circuit of the lighting system.
• the microcontroller evaluates the value of the fast overvoltage SRG and applies a current to the base b of the transistor 139, via its Digital / Analog output a, so as to allow the evacuation the energy of the fast surge SRG to ground, through all the electronic components and through the collector c and The emitter has a switch 121.
• the subset of electronic components representing all the LEDs uses the energy of the fast overvoltage SRG by emitting light.
• the initialization step of the table allows zeroing or initialization of the reference values by default values, in other words the initialization step replaces the reference values, such as the value d ST switching time and at least one RV power reference value, by default values or values equal to zero.
• This initialization step occurs when the device is new or when certain elements, such as for example a subset of electronic components EN, have been replaced by new elements.
• this initialization signal may be triggered by a reset button or by the unloading of a capacitor (not shown) so as to indicate to the control stage 102 that an initialization step is necessary since some settings may have changed.
• this initialization step may be considered secondary depending on the state of the device. Therefore, the control method PC can obtain the table of reference values RT comprising a subset, a value of switching time ST, and a reference value of supply RV.
• the PC control method can supply the subset optimally.
• a first subset and a second subset are powered according to the power reference values and the switching time values.
• the subassembly is powered by an ASV analog signal value as a function of the reference power supply RV associated with the subset of electronic components EN supplied in a period of time TP between two successive switching times.
• this ASV analog signal value is a current value to be generated by the Digital / Analog output a.
• the ASV analog signal value generated is proportional to the voltage value of the electric power source ES.
• the control method PC measures an operating value generated, typically in volts, by the previously generated GSV signal value.
• This GSV generated signal value via the Digital / Analog output a of the microcontroller 111, is characteristic of the subset of electronic components EN powered. For example, if the generated signal value GSV is X volts, it is clear to the control method PC that this value corresponds to a set of electronic components EN comprising Y subsets of electronic components. To this subset of electronic components EN is also associated the operating value MV generated by the generated signal value GSV, i.e. the PC control method will associate a current value of 21.6mA.
• the generated signal value GSV may be a current value or a voltage value which is converted into a current value by an amplifier circuit comprising a transistor, for example of the type represented by block 150.
• control method PC adjusts the reference value and / or the switching time ST as a function of the measured operating value MV.
• the subassemblies of electronic components SE have defects or otherwise say tolerances that may vary from one subset to another.
• This tolerance discrepancy between the subassemblies can be explained by the states of wear and / or the manufacturing processes. Therefore, it is very difficult to supply the set of electronic components EN in a suitable manner since each subset of electronic components EN is different. This difference ⁇ is very troublesome since this set of electronic components EN is composed of LEDs.
• the generated operating value MV is verified by the control method PC and is compared with a zero operating value or a current value equal to zero. This check allows the PC control method to detect a malfunction of the device related to an early ST switching time value. If this verification step confirms that the generated operating value MV is equivalent to the zero operation value, then the control method PC adjusts the switching time value ST of the analog signal value ASV.
• This adjustment step establishes the difference ⁇ of the subset of the group of electronic components supplied so as to have a difference ⁇ characteristic of the subset of the group of electronic components supplied.
• This difference ⁇ represents the difference between the measured MV operating value and the nominal operating value NMV of the supplied electronic component group subassembly. Since the control method PC is a convergent method, that is to say that the measured operating value MV will always be lower than the nominal operating value NMV, the difference ⁇ will be positive and tend towards zero.
• This difference ⁇ established makes it possible to determine a signal value allowing the adjustment of the reference value RV and / or the instant of switching ST. This signal value ⁇ is added to the reference value RV and / or the switching instant ST so as to be taken into account by the control method PC. This consideration is made as follows:
• RV + s RV RV *
• the adjusted switchover time ST * and / or the adjusted reference value RV * hereinafter referred to as the adjusted signal value SV
• the adjusted signal value SV respectively replace the switchover time ST and / or the reference value.
• adjusted RV in the table of reference values RT.
• the adjusted signal value sequence SV is then qualified as a signal value, i.e., the adjusted signal value SV becomes the signal value in the RT array.
• This signal value value is set so that the measured MV operating value reaches the nominal MV operating value asymptotically. In other words, the signal value tends to zero so that the difference ⁇ between the measured operating value MV and the nominal operating value NMV is close to zero or equal to zero if the subset of electrical components has been reached. Nominal operating value NMV without ever exceeding it.
• the regulation mode corresponds to a regulation of Proportional, Integral, Derived (PID) type.
• PID Proportional, Integral, Derived
• other modes of regulation can be used.
• the PC control method is based on a value approach approach in the form of a continuous slope change and / or a gradient of values.
• the analog signal is in the form of a continuous value set as a function of time and has no value jump, ie the value set includes a change of slope continuous and / or a gradient of values.

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

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• 2016
  • 2016-01-14 EP EP16701262.4A patent/EP3403471A1/de not_active Withdrawn
  • 2016-01-14 WO PCT/EP2016/050638 patent/WO2017121479A1/fr active Application Filing

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