NL2002602C2 - Power driver for a light source. - Google Patents

Power driver for a light source. Download PDF

Info

Publication number
NL2002602C2
NL2002602C2 NL2002602A NL2002602A NL2002602C2 NL 2002602 C2 NL2002602 C2 NL 2002602C2 NL 2002602 A NL2002602 A NL 2002602A NL 2002602 A NL2002602 A NL 2002602A NL 2002602 C2 NL2002602 C2 NL 2002602C2
Authority
NL
Netherlands
Prior art keywords
power
circuit
switch
electricity
control circuit
Prior art date
Application number
NL2002602A
Other languages
Dutch (nl)
Inventor
Gerard Kroone
Original Assignee
Ledzworld B V
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 Ledzworld B V filed Critical Ledzworld B V
Priority to NL2002602A priority Critical patent/NL2002602C2/en
Application granted granted Critical
Publication of NL2002602C2 publication Critical patent/NL2002602C2/en

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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]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • 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
    • H05B45/357—Driver circuits specially adapted for retrofit LED light sources
    • H05B45/3574—Emulating the electrical or functional characteristics of incandescent lamps
    • H05B45/3575—Emulating the electrical or functional characteristics of incandescent lamps by means of dummy loads or bleeder circuits, e.g. for dimmers
    • 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

Landscapes

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

Description

Power driver for a light source
The invention relates to a power driver for a light source, in particular for a light emitting diode or diodes, comprising a primary circuit for connection to a mains supply line optionally provided with a dimmer, and for converting power 5 from the mains supply line to a supply voltage for a LED or LED's through a secondary circuit.
A known problem in controlling the amount of light, that is emitted by a LED or LED's when a conventional dimmer is applied, is that such a conventional dimmer, such as a triac 10 based dimmer or a dimmer that cuts off a part of the alternating current that feeds the power driver for the LED or LED's, is adversely effected by the reduced amount of energy absorbed by the LED or LED's as compared to conventional light sources such as light bulbs .
15 It is an object of the invention to allow the application of any type of conventional dimmer for controlling the amount of light emitted by any type of light source, in particular by a light emitting diode or diodes.
In order to meet the objective of the invention and to 20 realise further advantages that come within reach by application of the invention, the power driver of the invention is characterized by the features of one or more of the appended claims .
It is particularly desirable that the power driver of 25 the invention has a primary circuit that, comprises a detection circuit for the slew-rate of the power from the mains supply line and/or for zero-detection of the voltage on said mains supply line, and that a control circuit connects to said detection circuit that controls a switch for connecting a load 30 to the mains supply line depending on the detected slew-rate and/or voltage of the power on the mains supply line. In this way it is possible to have the load (directly or indirectly) connected to the mains at times when the power consumption of the LED or LED's threatens to fall below a level that is 35 required for an undisturbed operation of the dimmer that is applied in the mains supply line. The load thus secures that when it is connected to the mains supply line, a predetermined minimum amount of power is consumed from the mains supply line.
An effective manner to embody the detection circuit is 2 that it comprises a voltage divider having a capacitor for preferentially passing on higher slew-rates than occur with undimmed power to the control circuit so as to induce that the control circuit closes the switch for connecting the load to the 5 mains when such higher slew-rates occur.
Preferably the control circuit comprises a microcontroller that controls the switch depending on signals from the detection circuit. Such a microcontroller can be tailored to the specific requirements of the applied LED or 10 LED's so as to best meet the required operating conditions of such LED's.
Effectively the switch is a transistor that is placed in series with an impedance, such that when the transistor is controlled to pass a current, said impedance limits the current 15 through said transistor. The transistor and the impedance, usually a resistor, together form the load that enables the (conventional) dimmer of the mains supply line to maintain within its operating range.
The invention shall hereinafter be further elucidated 20 with reference to the drawing of a single figure showing a schematic diagram of the power driver of the invention.
The power driver of the invention has sockets Jl, J2 for connecting it to a mains supply line, in which for control purposes a dimmer is included consistent to what is known from 25 the prior art for the control of conventional light bulbs or similar light sources.
The power driver of the invention comprises in its most preferential form circuit parts A, B, C, and D which collectively form a primary circuit of the power driver. The 30 power driver further comprises a secondary circuit connected to the primary circuit, which secondary circuit feeds a series of light emitting diodes LD1-LD8 which may be applied in any pre-established amount.
The secondary circuit E directly connects to a 35 convertor part D of the primary circuit A, B, C, D, which convertor part D serves to convert the power from the mains supply line that is available at the sockets Jl, J2 to a power level suitable for the light emitting diodes.
In series with the convertor part D is an energy 40 accumulating circuit A for improving a power factor cos φ, and a detector circuit B which connects to a rectifier BR1 which in 3 turn is connected to the sockets Jl, J2 for the mains supply line. The function of the detector circuit B will be discussed later.
A control part C controls the convertor part D for 5 regulating the amount of energy that flows from the mains supply line connected to the sockets Jl, J2 to eventually the secondary circuit that feeds the LED's LD1-LD8.
The control part C in turn is controlled by a microcontroller U3 that connects to the detection circuit B. The 10 detection circuit B provides the microcontroller U3 with information based on which the controller part C steers the convertor part D.
According to the invention the detector part B comprises a detection circuit R5, Cll, R4, R3 for detection of 15 the slew-rate of the power from the mains supply line connected to the sockets Jl, J2, and for zero-detection of the voltage on said mains supply line.
Any slew-rate which is higher than a normal slew-rate of the rectified voltage on line TP1 is detected by the 20 operation of capacitor Cll which preferentially passes on such higher slew-rates than occur with an undimmed power to the microcontroller U3. Depending on such signals the microcontroller U3 controls the operation of the transistor Ql such that the transistor Ql which is placed in series with resistor 25 R1 connects the series-circuit of Ql-Rl forming the load (indirectly) to the mains supply line. Thus from said mains a predetermined minimum amount of power is consumed that suffices for keeping the dimmer in its required operating range so as to secure the dimmer's uninterrupted and undisturbed operation.

Claims (4)

1. Vermogensaandrijfschakeling voor een lichtbron, in het bijzonder voor een lichtemitterende diode of diodes, omvattende een primaire schakeling voor verbinding met een elektriciteitsnet dat optioneel voorzien is van een 5 diminrichting, en voor het converteren van vermogen van het elektriciteitsnet naar een voedingspanning voor een LED of LED's via een secundaire schakeling, met het kenmerk, dat de primaire schakeling een detectieschakeling omvat voor de flanksteilheid van het vermogen van het elektriciteitsnet en/of voor nul-10 detectie van de spanning van genoemd elektriciteitsnet, en dat een regelschakeling gekoppeld is met genoemde detectieschakeling die een schakelaar bedient voor het direct of indirect koppelen van een belasting met het elektriciteitsnet afhankelijk van de gedetecteerde flanksteilheid en/of spanning op het 15 elektriciteitsnet, teneinde van het elektriciteitsnet een vooraf bepaalde minimumhoeveelheid vermogen af te nemen.A power drive circuit for a light source, in particular for a light-emitting diode or diodes, comprising a primary circuit for connection to an electricity network which is optionally provided with a dimming device, and for converting power from the electricity network to a supply voltage for an LED or LEDs via a secondary circuit, characterized in that the primary circuit comprises a detection circuit for the slope of the power of the electricity network and / or for zero detection of the voltage of said electricity network, and that a control circuit is coupled to said power network detection circuit which operates a switch for directly or indirectly coupling a load to the electricity grid depending on the detected slope and / or voltage on the electricity grid, in order to take a predetermined minimum amount of power from the electricity grid. 2. Vermogensaandrijfschakeling volgens conclusie 1, met het kenmerk, dat de detectieschakeling een spanningsdeler omvat met een condensator voor het met voorkeur doorgeven naar de 20 regelschakeling van hogere flanksteilheden dan optreden met een ongeregeld vermogen teneinde te veroorzaken dat wanneer dergelijke hogere flanksteilheden optreden, de regelschakeling de schakelaar sluit voor het verbinden van de belasting met het net.2. Power driver according to claim 1, characterized in that the detection circuit comprises a voltage divider with a capacitor for preferentially passing on to the control circuit of higher flank rises than occur with an uncontrolled power in order to cause that when such higher flank rises occur, the control circuit the switch closes for connecting the load to the mains. 3. Vermogensaandrijfschakeling volgens conclusie 1 of 2, met het kenmerk, dat de regelschakeling een microcontroller omvat, welke de schakelaar bedient afhankelijk van signalen van de detectieschakeling.A power driver according to claim 1 or 2, characterized in that the control circuit comprises a microcontroller which operates the switch depending on signals from the detection circuit. 4. Vermogensaandrijfschakeling volgens een van de 30 conclusies 1-3, met het kenmerk, dat de schakelaar een transistor is die in serie is geplaatst met een impedantie, zodanig dat wanneer de transistor wordt ingesteld voor het doorlaten van een stroom, genoemde impedantie de stroom door de transistor beperkt.4. Power driver according to any of claims 1-3, characterized in that the switch is a transistor arranged in series with an impedance, such that when the transistor is set to pass a current, said impedance is the current limited by the transistor.
NL2002602A 2009-03-09 2009-03-09 Power driver for a light source. NL2002602C2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL2002602A NL2002602C2 (en) 2009-03-09 2009-03-09 Power driver for a light source.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2002602 2009-03-09
NL2002602A NL2002602C2 (en) 2009-03-09 2009-03-09 Power driver for a light source.

Publications (1)

Publication Number Publication Date
NL2002602C2 true NL2002602C2 (en) 2010-09-13

Family

ID=40957846

Family Applications (1)

Application Number Title Priority Date Filing Date
NL2002602A NL2002602C2 (en) 2009-03-09 2009-03-09 Power driver for a light source.

Country Status (1)

Country Link
NL (1) NL2002602C2 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1467474A2 (en) * 2003-04-04 2004-10-13 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Interface circuit for operation of capacitive loads
WO2005115058A1 (en) * 2004-05-19 2005-12-01 Goeken Group Corp. Dimming circuit for led lighting device with means for holding triac in conduction
WO2006120629A2 (en) * 2005-05-09 2006-11-16 Koninklijke Philips Electronics N.V. Method and circuit for enabling dimming using triac dimmer
GB2435724A (en) * 2006-03-04 2007-09-05 Mood Concepts Ltd TRIAC dimming of LED lighting units
WO2008029108A1 (en) * 2006-09-04 2008-03-13 Lutron Electronics Co., Inc. Variable load circuits for use with lighting control devices

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1467474A2 (en) * 2003-04-04 2004-10-13 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Interface circuit for operation of capacitive loads
WO2005115058A1 (en) * 2004-05-19 2005-12-01 Goeken Group Corp. Dimming circuit for led lighting device with means for holding triac in conduction
WO2006120629A2 (en) * 2005-05-09 2006-11-16 Koninklijke Philips Electronics N.V. Method and circuit for enabling dimming using triac dimmer
GB2435724A (en) * 2006-03-04 2007-09-05 Mood Concepts Ltd TRIAC dimming of LED lighting units
WO2008029108A1 (en) * 2006-09-04 2008-03-13 Lutron Electronics Co., Inc. Variable load circuits for use with lighting control devices

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MM Lapsed because of non-payment of the annual fee

Effective date: 20150401