EP1894300A1 - Systeme de source de courant et procede pour faire fonctionner une charge electrique - Google Patents

Systeme de source de courant et procede pour faire fonctionner une charge electrique

Info

Publication number
EP1894300A1
EP1894300A1 EP06743161A EP06743161A EP1894300A1 EP 1894300 A1 EP1894300 A1 EP 1894300A1 EP 06743161 A EP06743161 A EP 06743161A EP 06743161 A EP06743161 A EP 06743161A EP 1894300 A1 EP1894300 A1 EP 1894300A1
Authority
EP
European Patent Office
Prior art keywords
current source
voltage
electrical load
transistor
input
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
Application number
EP06743161A
Other languages
German (de)
English (en)
Other versions
EP1894300B1 (fr
Inventor
Peter Trattler
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.)
Ams AG
Original Assignee
Austriamicrosystems AG
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 Austriamicrosystems AG filed Critical Austriamicrosystems AG
Publication of EP1894300A1 publication Critical patent/EP1894300A1/fr
Application granted granted Critical
Publication of EP1894300B1 publication Critical patent/EP1894300B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • 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
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices

Definitions

  • the present invention relates to a power source arrangement, the use thereof, and a method for operating an electrical load.
  • Power source arrangements serve, for example, to supply one or more electrical loads with electrical energy.
  • a plurality of series circuits each comprising a current source and an associated load, may be provided. If the branches connected in parallel are supplied with a common supply voltage, it may be desirable to regulate the supply voltage.
  • the voltage drop across each current sink voltage can be measured and then the minimum of the current sink voltages can be determined. This lowest current sink voltage is compared with a desired value and depending on the comparison result, the supply voltage is varied. This ensures that the minimum voltage drop across the current sink corresponds at least to the threshold value. As a result, all power sources work in a predetermined voltage range.
  • the object of the present invention is to provide a current source arrangement and a method for operating an electrical load, in which a simple Heidelbergungsauf- construction with good efficiency is possible. According to the invention the object is achieved with respect to the device by a current source arrangement having the features of patent claim 1.
  • the proposed power source arrangement includes a power source and associated means for connecting an electrical load.
  • the current source and the means for connecting an electrical load are connected to one another such that a common current path is formed when the electrical load is connected.
  • a voltage tap node is coupled to the means for connecting an electrical load. This is designed such that a voltage dropping across the electrical load and / or the current source or a signal derived therefrom can be tapped off.
  • a comparator is connected at its first input to the tap node.
  • a second input of the comparator is arranged to supply a reference threshold.
  • An output of the comparator is connected to a control input of a transistor.
  • the transistor has a controlled path, which is connected between a signal line and a reference potential connection.
  • a DC voltage regulator for example a DC / DC converter, is designed at an input for supplying an input voltage.
  • An output of the DC regulator is connected to the means for connecting the electrical load.
  • a feedback input of the DC regulator is connected to the signal line. If too low a voltage drops above the power source, the signal line is pulled down. Thus, the feedback input of the DC regulator is pulled down. As a result, the DC regulator compensates for this by increasing its output voltage to regain the correct feedback voltage at the feedback input.
  • each branch comprising a means for connecting an electrical load and an associated current source, each associated with a comparator with downstream transistor.
  • each branch comprising a means for connecting an electrical load and an associated current source, each associated with a comparator with downstream transistor.
  • common to all branches is the signal line and the DC voltage regulator.
  • At least one further current source and at least one further means for connecting an electrical load is provided, which is connected to the at least one further current source.
  • At least one further voltage tapping node is coupled to the at least one further means for connecting an electrical load.
  • At least one further comparator with a first input, which is connected to the at least one further tap node, and with a second input configured for supplying at least one further reference source is provided.
  • At least one further transistor is connected to it, which is connected on the load side to the common signal line.
  • the proposed principle is characterized in particular by a high efficiency.
  • the proposed circuit can be realized in a simple manner and in a small size. Furthermore, it is characterized by the fact that it can be easily extended, cascaded and configured almost arbitrarily. Any number of power sources can be added without the need for additional circuitry, even across different semiconductor chips. Between several power sources, only a single line is required, namely the designated here as a signal line line. If in each case a plurality of different load types are to be controlled, for example red, green and blue (RGB) light-emitting diodes, abbreviated LEDs, the current sources can preferably be arranged in groups such that a common signal line is provided for each load type.
  • RGB red, green and blue
  • the reference thresholds may be the same or different.
  • the electrical loads each comprise at least one light emitting diode or a series connection of a plurality of light emitting diodes.
  • the branches each comprising a current source and a means for connecting an electrical load, may be grouped together such that there is a means between the tap nodes of such a group and the comparator is switched to select a minimum input voltage.
  • the types of loads may be light emitting diodes of different colors, such as red, green and blue light emitting diodes.
  • the voltage tap node may be coupled to the means for connecting an electrical load such that the voltage tap node is formed at a control terminal of a current source transistor, wherein the controlled path of the current source transistor is formed in a common current path with the means for connecting the electrical load.
  • the comparator may comprise an operational amplifier.
  • the combination of comparator and downstream transistor is preferably designed so that at different input levels at the input of the comparator not a rapid tilting of the output level to an extreme value, but rather that at the output to the difference at the input proportional signal is provided. This means that preferably a finite amplification is provided. This gain can be expressed in amperes per volt (current output to voltage input).
  • the DC voltage regulator preferably comprises a so-called DC / DC converter. This is preferably designed as a so-called inductive Bück converter or down converter, Boost Converter or boost converter, buck / boost converter, capacitive charge pump, LDO (linear regulator) or the like.
  • a low-pass filter is preferably provided.
  • Minimum and maximum limits for the output voltage of the DC-DC converter can be set exactly by resistor divider ratios. This can be achieved with advantage that even if an electrical load fails, the supply voltage at the output of the DC voltage converter always remains within the specified limits for this output voltage.
  • the proposed principle is preferably generally suitable for lighting applications.
  • the proposed principle for the backlighting of liquid crystal displays, LCD is suitable.
  • the proposed principle can be used in such lighting applications in which a plurality of LED series circuits or chains are provided.
  • FIG. 1 shows an embodiment of a current source arrangement according to the proposed principle based on a circuit diagram
  • FIG. 2 shows a further exemplary embodiment of a current source arrangement according to the proposed principle on the basis of a circuit diagram
  • FIG. 4 shows a further exemplary embodiment of a current source arrangement according to the proposed principle
  • FIG. 5 shows another embodiment of a current source arrangement according to the proposed principle
  • FIG. 6 shows an exemplary embodiment of a current source arrangement according to the proposed principle with different load types
  • FIG. 7 shows a first exemplary embodiment of a comparator transistor arrangement
  • FIG. 8 shows another embodiment of a comparator transistor arrangement
  • FIG. 9 shows a still further embodiment of a comparison transistor arrangement for use in a circuit according to one of the figures 1, 2, 4 to 6, and
  • FIG 10 shows an exemplary embodiment of a voltage tap formed on the control input of the current source transistor according to the proposed principle.
  • FIG. 1 shows a current source arrangement according to the proposed principle.
  • a power source 1 is in a common Current path connected to a means 2 for connecting an electrical load 3. Between the power source 1 and the electrical load 3, a voltage tap node 4 is formed.
  • the voltage tap node 4 is connected to an inverting input of a comparator 5.
  • Another input of the comparator 5 is provided with reference numeral 6, non-inverting and designed to supply a reference threshold V c .
  • the output of the comparator 5 is connected to the control input of an associated transistor 7.
  • Transistor 7 may be a MOSFET or bipolar transistor.
  • the controlled path of the transistor 7 is connected between a common signal line 8 and a reference potential connection 9.
  • the signal line 8 is connected to a feedback input of a DC voltage regulator 10 for its control.
  • the DC voltage regulator 10 has a
  • Input 11 for supplying an input voltage and an output 12 for providing a supply voltage VDD as a function of the input voltage and the level of the common signal line 8.
  • This output 12 of the DC voltage regulator 10 is connected to another terminal of the terminal 2 for connecting the electrical load 3rd connected.
  • the signal UV of the common signal line controls the supply voltage VDD. If one of the current sources 1, 20, 21 has too low a voltage (a voltage below the comparison potential V c ), the line 8 is pulled slightly downward with respect to the voltage UV. Thus, the voltage at the feedback input of the DC regulator 10 is pulled down. This is compensated by the DC voltage controller 10 in that the voltage VDD at the output 12 is increased. The voltage VDD at the output is increased until the correct voltage UV is present at the feedback input.
  • the DC voltage regulator 10 can be any adjustable DC / DC
  • the voltage regulator 10 may be an inductive buck, boost, buck / boost regulator or a capacitive charge pump or a simple series regulator.
  • the circuit according to FIG. 1 has a simple circuit structure, which can be implemented in particular in integrated circuit technology with a small area requirement.
  • the circuit can be easily extended, cascaded and configured with additional branches. Any number of power sources can be added, requiring no additional circuitry.
  • An advantageous feature of the circuit of Figure 1 is that only one line, namely the common signal line 8, is required for coupling the individual power source branches together.
  • FIG. 2 shows a further exemplary embodiment of a current source arrangement according to the proposed principle, which largely coincides with the circuit according to FIG. 1 in the components used and their advantageous interconnection. In that regard, the description of the circuit will not be repeated here.
  • the electrical loads 3, 13, 23 are each in Figure 2 as a series circuit of a plurality of light-emitting diodes, LEDs 30, 31; 32, 33; 34, 35 executed.
  • the current sources 1, 20, 21 are each implemented in FIG. 2 with a respective current source transistor 36, the controlled path of which is connected between the respective tap nodes 4, 14, 24 and a resistor 37 connected to reference potential.
  • the control input of the current source transistor 36 is connected to the output of a differential amplifier 38 having two inputs. One input is formed as a terminal for supplying a reference threshold, while the other input is connected to the load terminal of the transistor 36, which is connected to the resistor 37.
  • the DC voltage regulator 10 is not shown in FIG. 2 for reasons of clarity.
  • the current source 36, 37, 38 according to FIG. 2 is particularly advantageous with regard to stability and adjustability.
  • FIG. 3 shows another exemplary embodiment of a DC-DC converter for use in the circuits according to FIGS. 1 or 2.
  • the actual DC / DC converter 39 has an input 40 for supplying an input voltage which drops with respect to reference potential 41. At the output 42, the supply voltage VDD is provided.
  • the common signal line 8 is not directly connected to the feedback input 43 of the DC-DC converter. Rather, a low-pass filter, comprising a series resistor 44 and a downstream capacitance 45 connected to reference potential. This low-pass filter 44, 45 is connected via a coupling resistor 46 to the actual feedback input 43.
  • a voltage divider 49 is provided which comprises a first resistor 47 and a second resistor 48. The first resistor 47 is connected between the output 42 and the feedback input 43.
  • the second resistor 48 is connected between the feedback input 43 and a reference potential.
  • the resistors 47, 48 have resistance values Rl, R2.
  • the resistor 44 of the low-pass filter has the resistance R4.
  • the capacity 45 of the low-pass filter has the capacitance value Cl.
  • the coupling resistor 46 has the resistance value R3.
  • the low-pass filter comprising the components 44, 45 is used. These form the dominant pole in the transfer function of the control loop.
  • the minimum output voltage VDD MIN at the output 42 is set by the ratio of the resistance values Rl, R2.
  • the maximum output voltage VDD MAX at the output 42 is set by the values of the resistors Rl to R4.
  • Vref is the voltage at node 43 that the DC / DC converter keeps constant.
  • VDD MIN Vref - -
  • Figure 4 shows another embodiment of the circuit of Figure 2. This corresponds to that largely in structure and advantageous interconnection and will not be described at this point again.
  • the current branches each comprising a current source, a comparator and a transistor, are each formed in pairs in FIG. 4 in pairs on common monolithically integrated chips 50, 51, 52.
  • a common signal line 8 can nevertheless be provided. There are no additional circuits needed.
  • FIG. 5 shows a development of the circuit of Figure 4, in which the proposed principle is combined with the principle of selecting a minimum voltage.
  • a minimum selection circuit 53, 54, 55 is provided on each of the chips 50 ', 51', 52 ', whose inputs are connected to the tap nodes of all branches on the respective chip.
  • the output of the minimum selector 53, 54, 55 is connected to a common comparator 56, 57, 58 on each chip, whose output in turn drives a common transistor 59, 60, 61 on each chip.
  • a load terminal of this transistor 59, 60, 61 is in turn connected to a common signal line 8 all chips 50 ', 51', 52 '.
  • the flexibility can be further increased.
  • FIG. 6 shows another development of the circuit of FIG. 4 with an example.
  • Each of the chips 50 'to 52' is configured to drive different types of electrical loads, for example, red diodes 62r, blue diodes 62b, and green diodes 62g.
  • those branches which are designed to drive the red light-emitting diodes 62r are connected to a first common signal line 8r, while those branches which are designed to drive the blue diodes 62b are each connected to a second common signal line 8b via different chips , Those branches which are designed to drive the green LEDs 62g are connected to a third common signal line 8g.
  • the red, blue and green diodes 62r, 62b and 62g are supply voltage side to each one associated supply voltage line, different for each type, for guiding different supply voltages
  • VDDB, VDDR, VDDG connected.
  • Figure 7 shows the embodiment of the comparator 5 with downstream transistor 7 according to Figures 1, 2 and 4 to 6.
  • this combination of comparator and transistor can in the figures 1, 2 and 4 to 6, for example, an arrangement according to Figure 8, 9 or 10 be turned on.
  • the comparator formed as OTA (operational transconductance amplifier-transconductance amplifier) 64 with a downstream current mirror 65 whose output transistor corresponds to the transistor 7 of FIG. 7 is characterized in particular by the small chip area requirement.
  • OTA operational transconductance amplifier-transconductance amplifier
  • a drain current is only delivered to the output 66, ie to the common signal line, if the voltage at the negative input 67 is smaller than that at the positive input 68. This is exactly the desired behavior of the control principle.
  • FIG. 9 shows a further development of the circuit of FIG. 8, likewise with an OTA 64 and a current mirror 65.
  • additional current mirrors 69, 70, 71 are provided for their coupling to one another, resulting in an improved amplification factor and a better driver capability for the output transistor 72 to lead.
  • the transistor 65 may optionally be removed - as in the embodiment according to FIG. 8.
  • the voltage tap may also be provided at the control input of the current source transistor 36 instead of at the load terminal of the current source transistor 36.
  • the circuit of Figure 10 is thus also an alternative to the formation of the current sources of Figures 2 and 4 to 6.
  • the sampling of the voltage at the gate of the current source transistor as the tap node has the advantage that the gate voltage This transistor is monitored and is within a predetermined limited range, namely limited by the reference voltage Vg at the input of the comparator 5. This is particularly advantageous in view of manufacturing variations of the current source transistors. It should be noted that the inputs of the comparator 5 must be replaced. All circuit arrangements according to FIGS. 7 to 10 can, as shown in field effect transistor technology, eg. B. as MOSFETs, or alternatively be executed in bipolar technology.
  • the proposed principle is particularly advantageous for driving LED arrays in RGB or single colors.
  • the principle can be used in the following fields of application, namely general illumination, backlighting of liquid crystal display, LCD RGB

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
  • Led Devices (AREA)
  • Dc-Dc Converters (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

L'invention concerne un système de source de courant présentant au moins une branche comprenant une source de courant (1) et des moyens (2) pour raccorder une charge électrique (3). Un comparateur (5) est raccordé à un noeud de prise de tension (4) de cette branche, un transistor (7) étant monté en aval de ce comparateur (5). Ledit transistor (7) est relié à une ligne de signaux commune (8) qui est elle-même raccordée à une entrée de rétroaction d'un régulateur de tension continue (10). Un nombre voulu de branches complémentaires peuvent être ajoutées au système avec la même ligne de signaux commune (8). Ce système de source de courant peut être utilisé en particulier pour alimenter plusieurs faisceaux de DEL pour des applications d'éclairage et des dispositifs d'affichage.
EP06743161A 2005-06-20 2006-06-14 Systeme de source de courant et procede pour faire fonctionner une charge electrique Expired - Fee Related EP1894300B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005028403A DE102005028403B4 (de) 2005-06-20 2005-06-20 Stromquellenanordnung und Verfahren zum Betreiben einer elektrischen Last
PCT/EP2006/005749 WO2006136321A1 (fr) 2005-06-20 2006-06-14 Systeme de source de courant et procede pour faire fonctionner une charge electrique

Publications (2)

Publication Number Publication Date
EP1894300A1 true EP1894300A1 (fr) 2008-03-05
EP1894300B1 EP1894300B1 (fr) 2008-10-01

Family

ID=36862021

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06743161A Expired - Fee Related EP1894300B1 (fr) 2005-06-20 2006-06-14 Systeme de source de courant et procede pour faire fonctionner une charge electrique

Country Status (6)

Country Link
US (1) US8063585B2 (fr)
EP (1) EP1894300B1 (fr)
JP (1) JP4955672B2 (fr)
KR (2) KR101159931B1 (fr)
DE (2) DE202005021665U1 (fr)
WO (1) WO2006136321A1 (fr)

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EP1894300B1 (fr) 2008-10-01
KR101159931B1 (ko) 2012-06-25
US20090212717A1 (en) 2009-08-27
DE202005021665U1 (de) 2009-04-02
DE102005028403B4 (de) 2013-11-21
JP4955672B2 (ja) 2012-06-20
KR20100018074A (ko) 2010-02-16
US8063585B2 (en) 2011-11-22
DE102005028403A1 (de) 2006-12-28
KR100989021B1 (ko) 2010-10-20
KR20080032090A (ko) 2008-04-14
WO2006136321A1 (fr) 2006-12-28
JP2008547368A (ja) 2008-12-25

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