EP2249621B1 - Zur Verwendung in einem Dimmer angepasste LED-Dimmervorrichtung - Google Patents

Zur Verwendung in einem Dimmer angepasste LED-Dimmervorrichtung Download PDF

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Publication number
EP2249621B1
EP2249621B1 EP09159349.1A EP09159349A EP2249621B1 EP 2249621 B1 EP2249621 B1 EP 2249621B1 EP 09159349 A EP09159349 A EP 09159349A EP 2249621 B1 EP2249621 B1 EP 2249621B1
Authority
EP
European Patent Office
Prior art keywords
voltage
dimmer
led
detection circuit
transformer
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.)
Not-in-force
Application number
EP09159349.1A
Other languages
English (en)
French (fr)
Other versions
EP2249621A1 (de
Inventor
Dezhi Zou
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.)
Civilight Shenzhen Semiconductor Lighting Co Ltd
Original Assignee
Civilight Shenzhen Semiconductor Lighting Co Ltd
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Publication date
Application filed by Civilight Shenzhen Semiconductor Lighting Co Ltd filed Critical Civilight Shenzhen Semiconductor Lighting Co Ltd
Priority to EP09159349.1A priority Critical patent/EP2249621B1/de
Publication of EP2249621A1 publication Critical patent/EP2249621A1/de
Application granted granted Critical
Publication of EP2249621B1 publication Critical patent/EP2249621B1/de
Not-in-force legal-status Critical Current
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    • 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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/382—Switched mode power supply [SMPS] with galvanic isolation between input and output
    • 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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/385—Switched mode power supply [SMPS] using flyback topology
    • 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]
    • H05B45/30—Driver circuits
    • H05B45/355—Power factor correction [PFC]; Reactive power compensation
    • 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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/38—Switched mode power supply [SMPS] using boost topology

Definitions

  • the present invention relates to a dimmer device, and more particularly pertains to a LED dimmer device adapted for use in dimmer.
  • Si-controlled dimmer and electro-transistor dimmer can adjust brightness of tungsten lamp.
  • on-time of dimmer 5 is determined by charging time of capacitance 9 of circuit, and therefore change conduction angle of sinusoidal alternating current non-sinusoidal waveforms, and thus change current of the tungsten lamp 10 so as to adjust brightness, which is defined as leading edge technology.
  • dimmer 5 is connected with tungsten lamp 10 in series. Current passes through fuse 1, inductance 2, Potentiometer 7, resistance 8, capacitance 9, and tungsten lamp 10 to form a charging loop of charging capacitance 9.
  • the charging time of the capacitance 9 is determined by resistance of the potentiometer 7.
  • the capacitance 9 When charging of the capacitance 9 is finished after a predetermined time, the capacitance 9 triggers control end of the dimmer 5 via trigger diode 6 to make dimmer 5 conductive. Because the tungsten lamp 10 is resistance load, a voltage waveform 1 is consistent with current waveform 3 (referring to FIG. 2 ) after edge of dimmer, and the on-time is same as off-time. Therefore, the adjusting of brightness of the tungsten lamp 10 is achieved.
  • LED is energy-saving and new lamp.
  • the power of LED is much smaller than tungsten lamp.
  • LED is a low-voltage direct current element.
  • LED lamp need to be equipped with a LED driving power supply so as to be drived to illuminate.
  • LED driving-switch power supply is capacitive load and is not equipped with dimmer control circuit.
  • the on-time of the dimmer 5 is shorter than that of voltage (referring to FIG. 3 ).
  • there is no current passing through the dimmer 5 there is voltage existed between the resistance 7 and the capacitance 9. This voltage charges for the capacitance 9.
  • the dimmer 5 When charging for a predetermined time, the dimmer 5 is triggered, the dimmer 5 is in on-time twice in a half-period. LED lamp flashes frequently because of intermittence of input of driving-switch power supply. Therefore, the dimmer cannot adjust brightness of LED lamp with Internal/Extemal Auto-switch
  • a dimmer device adapted for use in dimmer is desired to overcome the above-described shortcomings.
  • US-A-2005/0231133 in its figures 8-10 shows a conventional light source power supply, which employs a power factor correction apparatus between the rectifier and the DC-DC converter for adjusting the waveform and phase of the input voltage.
  • the DC-DC converter of the power supply has a feedback-control loop as a power supply controller to receive the converter's output voltage and provide a control signal to a switch so as to adjust the amount of energy transferred across the transformer of the converter in a given time period.
  • the LED dimmer device includes rectifier, voltage boost device, pre-voltage detection circuit and after-voltage detection circuit adapted for detecting voltage, master chip adapted for driving circuit and elements to work, elementary transformer and secondary transformer adapter for changing voltage, secondary rectifier adapted for rectifying and secondary filter capacitance circuit adapter for filtering, and secondary switch.
  • the rectifier is adapted for transforming alternating current into direct current.
  • the voltage boost device includes a metal oxide semiconductor field effect transistor used to make dimmer entering into a normal phase-cutting state.
  • the master chip includes integrated comparing element used to compare voltage.
  • the secondary switch is used to drive transformer primary and secondary circuits, secondary rectifier, secondary filter capacitance circuit so as to drive LED light source to illuminate.
  • the voltage booster device is adapted for enabling on-time current and on-time voltage of dimmer being in same phase mode, and having a relative lower peak value of current.
  • the voltage of the pre-voltage detection circuit changes correspondingly, which acts as standard voltage to control brightness changing and is inputted to the master chip to control frequency and duty-cycle of secondary switch, then the primary and secondary circuits of transformer, secondary rectifier and secondary filter circuit are driven so as to drive LED light source to illuminate.
  • the dimmer is any one of Si-controlled dimmer and electro-transistor dimmer.
  • the number of the LED light source is one or more, and the LED light source is single color or multi-color.
  • Si-controlled dimmer and electro-transistor dimmer may adjust brightness of LED light source such that environment friendly LED is more widely applied.
  • the dimmer device has good the brightness adjusting efficiency.
  • mains supply voltage is transformed into direct-current voltage via primary rectifier 1 and filter capacitance 2.
  • the start-up resistance 9 firstly charges the master chip 10 so as to drive voltage boost device 5, 6, 7 to work.
  • the voltage respectively detected by pre-voltage detection circuit 3, 4 and after-voltage detection circuit 11, 12 are simultaneously inputted to integrated comparator in the master chip 10 to compare, and then duty-cycle of metal oxide semiconductor field effect transistor (MOSFET) 7 of the step-up is adjusted to ensure that the voltage of step-up filter capacitance 8 is higher 30 volt-ampere than that of the filter capacitance 2.
  • MOSFET metal oxide semiconductor field effect transistor
  • the peak value current of the adapter is relative low and has the same on-time as the voltage waveform. Furthermore, the power factor can be over 0.8.
  • switch tubes of step-up circuit is always in high frequency switch working state. The charge path of trigger circuit of the adapter is maintained, the adapter can be triggered again and works normally, which can be seen from waveform shown in FIG. 6 and FIG. 7 .
  • the secondary switch 14 is driven by the master chip 10 to work.
  • the pre-voltage detection circuit 3, 4 can detect change of voltage, which is also detection voltage of adapting information, and which is inputted to the master chip 10.
  • Changing the duty-cycle of the secondary switch 14 adapts elementary charging current of the transformer.
  • the secondary switch 14 is turned off, energy of transformer obtained by charging discharges to transformer secondary circuit 23. After acted by the secondary rectifier 24 and the secondary filter capacitance 25, the LED is driven to illuminate. Therefore, the brightness and driving current of the LED is controlled by the adapter such that the Si-controlled dimmer and electro-transistor dimmer can adjust the LED light source.
  • FIG. 6 shows a schematic view of voltage and current waveform of a dimmer device adapted for use in dimmer according to a preferred embodiment according to the present invention.
  • 1 indicates waveform rectified by electro-transistor dimmer, and the Si-controlled is adjusted to a lowest controlling angle, and the voltage thereof is 164 VDC.
  • 2 indicates voltage waveform of the capacitance after step-up, and maximum of voltage is 210 VDC.
  • 3 indicates alternating current waveform, in which current and voltage are in same mode and in same on-time. Maximum of current is 360 MA. 4 indicates driving waveform of MOSFET, of which frequency is 63 KHZ, and of which duty-cycle is 32%.
  • FIG. 7 shows a schematic view of voltage and current waveform of a dimmer device adapted for use in dimmer according to a preferred embodiment according to the present invention.
  • 1 indicates waveform rectified by Si-controlled dimmer, and the Si-controlled is adjusted to a lowest controlling angle, and the voltage thereof is 184 VDC.
  • 2 indicates voltage waveform of the capacitance after step-up, and maximum of voltage is 250 VDC.
  • 3 indicates alternating current waveform, in which current and voltage are in same phase mode and in same on-time. Maximum of current is 300 mA.
  • 4 indicates driving waveform of MOSFET, of which frequency is 63 KHZ, and of which duty-cycle is 25%.

Landscapes

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

Claims (6)

  1. Zum Betrieb mit einem Phasenabschnittsdimmer abgestimmte LED-Dimmervorrichtung, welche umfasst:
    einen für die Umwandlung von Wechselstrom zu Gleichstrom angepassten Primärgleichrichter (1);
    einen Spannungserhöher (5-7), welcher einen Transistor (7) beinhaltet, abgestimmt, um den Dimmer in einen normalen Phasenanschnitt-Betrieb kommen zu lassen;
    eine Eingangsspannungs-Detektorschaltung (3, 4) sowie eine Nachspannungs-Detektorschaltung (11, 12), abgestimmt für das Erkennen einer Spannung nach dem Primärgleichrichter beziehungsweise einer Spannung nach dem Spannungserhöher;
    einen für die Ansteuerung der Stromkreise und Elemente der Vorrichtung angepassten Masterchip (10), wobei der Masterchip einen integrierten Komparator beinhaltet, der ausgelegt ist auf das Abgleichen von Spannungen;
    einen Transformator, der einen Primärkreis (13) und einen Sekundärkreis (23) beinhaltet, ausgelegt für eine Spannungsänderung, wobei der Primärkreis (13) verbunden ist mit dem Ausgang des Spannungserhöhers (5-7);
    einen für die Gleichrichtung des Ausgangsstroms des besagten Transformators angepassten Sekundärgleichrichter (24);
    einen für das Filtern des Ausgangsstroms des Transformators angepassten Sekundärfilter (25, 26);
    und
    einen Sekundärschalter (14), der ausgelegt ist auf den Betrieb des besagten Primär- und Sekundärkreises des Transformators, des Sekundärgleichrichters und des Sekundärfilters, sodass die LED-Lichtquelle zum Leuchten gebracht werden kann,
    dadurch gekennzeichnet,
    dass besagter Transistor (7) des Spannungserhöhers (5-7) ein Metall-Oxid-Halbleiter-Feldeffekttransistor ist, und
    dass besagter Masterchip (10) ausgerichtet ist auf den Betrieb des Sekundärschalters (14), basierend auf der durch die Eingangsspannungs-Detektorschaltung (3, 4) erkannten Spannung.
  2. Die LED-Dimmervorrichtung nach Anspruch 1, wobei der Spannungserhöher so ausgelegt ist, dass er bewirkt, dass Laststrom und Lastspannung des Dimmers die gleiche Phase haben, sowie dass der Spitzenwert des Stroms im Vergleich geringer ist.
  3. Die LED-Dimmervorrichtung nach Anspruch 2, wobei nach Gleichrichtung des Wechselstroms die Vorrichtung ausgelegt ist auf das zeitgleiche Einspeisen der durch die Eingangsspannungs-Detektorschaltung erkannten Spannung sowie der durch die Detektorschaltung für die Spannung nach dem Spannungserhöher gemessenen Spannung in besagten integrierten Komparator des Masterchip, um dadurch Frequenz und Tastverhältnis des Spannungserhöhers so zu steuern, dass die Differenz zwischen der hochtransformierten Spannung und der elementar gleichgerichteten Spannung bei 30 Volt gehalten wird.
  4. Die LED-Dimmervorrichtung nach Anspruch 3, wobei das Gerät ausgelegt ist auf die Änderung des Einschaltwinkels der Wechselspannung des Phasenanschnittdimmers, sodass sich die Spannung an der Eingangsspannungs-Detektorschaltung entsprechend ändert, welche als Basisspannung für eine Helligkeitsänderung der LED-Lichtquelle dient und angepasst wird, um vom Masterchip eingelesen zu werden, um Frequenz und Tastverhältnis des Sekundärschalters zu steuern, sodass der Transformator, der Sekundärgleichrichter und der Sekundärfilter in einer Weise angesteuert werden, dass die LED-Lichtquelle zum Leuchten gebracht wird.
  5. Dimmer, der eine LED-Dimmervorrichtung nach Anspruch 1 beinhaltet, wobei der Dimmer ein Si-gesteuerter Dimmer oder ein Elektrotransistor-Dimmer ist.
  6. LED-Anordnung die eine LED-Dimmervorrichtung nach Anspruch 1 beinhaltet, wobei die LED-Lichtquelle eine oder mehrere LEDs aufweist, und die LED-Lichtquelle einfarbig oder mit Farbwechsel ist.
EP09159349.1A 2009-05-04 2009-05-04 Zur Verwendung in einem Dimmer angepasste LED-Dimmervorrichtung Not-in-force EP2249621B1 (de)

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Application Number Priority Date Filing Date Title
EP09159349.1A EP2249621B1 (de) 2009-05-04 2009-05-04 Zur Verwendung in einem Dimmer angepasste LED-Dimmervorrichtung

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EP09159349.1A EP2249621B1 (de) 2009-05-04 2009-05-04 Zur Verwendung in einem Dimmer angepasste LED-Dimmervorrichtung

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EP2249621B1 true EP2249621B1 (de) 2014-04-30

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GB2507308A (en) * 2012-10-25 2014-04-30 Spled Ltd LED module driver
CN108289354A (zh) * 2018-02-02 2018-07-17 Tcl-罗格朗国际电工（惠州）有限公司 调光电路及电位器

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US6956336B2 (en) * 2002-07-22 2005-10-18 International Rectifier Corporation Single chip ballast control with power factor correction
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KR100727354B1 (ko) * 2005-11-09 2007-06-13 주식회사 유양정보통신 발광 다이오드 정전류 펄스폭 변조 구동 회로

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