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WO2013092162A1 - Circuit de retour d'information pour commande de marge de tension, circuit d'attaque et dispositif d'éclairage - Google Patents

Circuit de retour d'information pour commande de marge de tension, circuit d'attaque et dispositif d'éclairage Download PDF

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Publication number
WO2013092162A1
WO2013092162A1 PCT/EP2012/073970 EP2012073970W WO2013092162A1 WO 2013092162 A1 WO2013092162 A1 WO 2013092162A1 EP 2012073970 W EP2012073970 W EP 2012073970W WO 2013092162 A1 WO2013092162 A1 WO 2013092162A1
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WO
WIPO (PCT)
Prior art keywords
voltage
resistor
terminal
output terminal
feedback
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.)
Ceased
Application number
PCT/EP2012/073970
Other languages
English (en)
Inventor
Zeke WEI
Xihe ZHUANG
Xuewei Dai
Zhijian Cao
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.)
Osram GmbH
Original Assignee
Osram GmbH
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 Osram GmbH filed Critical Osram GmbH
Publication of WO2013092162A1 publication Critical patent/WO2013092162A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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

Definitions

  • the present invention relates to a feedback circuit, a driver and an illuminating device.
  • the constant current drive is provided in order to obtain a constant operation current adapted to a load.
  • a driving circuit usually has two stages, namely, a constant voltage unit as the first stage and a constant current unit as the second stage. If the driving circuit is designed for different loads, the efficacies will be different when the driving circuit is con ⁇ nected to different loads. Normally, the highest efficiency can be obtained in the case of a full load, and the lower the load is, the lower the efficiency is, with reference to Fig. 1. As a result, in the prior art, there is a problem of a low efficiency of the driving circuit in the case of low loads .
  • one object of the present invention lies in pro ⁇ viding a feedback circuit for driving circuit.
  • the feedback circuit having a strong universality and an advantage of re- ducing EMI Emission, can provide a high efficiency in case of different loads, and especially in the case of a low load, it still can provide a higher efficiency.
  • a feedback circuit for driving circuit is provided according to the present invention, wherein the driving circuit com- prises a constant voltage unit as a first stage and a con ⁇ stant current unit as a second stage, and the feedback cir ⁇ cuit comprises a first feedback unit connected to a constant voltage output terminal of the constant voltage unit and a second feedback unit connected to a constant current output terminal of the constant current unit, the second feedback unit generates a compensation signal according to a voltage of the constant current output terminal and inputs the com ⁇ pensation signal to the first feedback unit, the first feed ⁇ back unit adjusts a voltage of the constant voltage output terminal, according to the compensation signal, to be posi ⁇ tively correlated with the voltage of the constant current output terminal.
  • the term “nega ⁇ tively” means that change tendencies for the two are oppo ⁇ site, and the term “positively” means that change tendencies for the two are the same.
  • the inventive concept of the present invention lies in that, by providing the second feedback unit, the voltage of the constant voltage output terminal is set by taking the voltage of the constant current output terminal representing the size of the load into consideration, thus, when the voltage of the constant current output terminal is reduced, i.e., when the load is reduced, the compensation signal for compensating the load reduction is supplied to the first feedback unit which adjusts the voltage of the constant voltage output terminal to be low, as a result, a difference between the voltage of the constant current output terminal and the voltage of the constant voltage output terminal is assured to be reduced, and the efficiency of the constant current unit is improved, allowing the total efficiency of the constant voltage unit and the constant current unit to be efficiently enhanced.
  • the voltage of the constant current output terminal when the voltage of the constant current output terminal is increased, the voltage of the constant voltage output terminal will be adjusted to be high, which guarantees a sufficient voltage difference for operation of the constant current unit. Consequently, a high efficiency can be ob- tained and the normal operation of the load will not be af ⁇ fected in both situations of a low load and a high load.
  • the compensation signal and the voltage of the constant current output terminal are, preferably, negatively correlated.
  • the voltage of the constant voltage output termi- nal is adjusted to be positively in proportion to the voltage of the constant current output terminal, thus, the feedback is allowed to be precise and timely.
  • the compensation signal are negatively in proportion to the volt ⁇ age of the constant current output terminal for facilitating to adjust the voltage of the constant voltage output terminal to be positively in proportion to the voltage of the constant current output terminal .
  • the sec ⁇ ond feedback unit comprises a detecting circuit configured to generate a detection signal according to the voltage of the constant current output terminal, and a compensating circuit configured to generate the compensation signal according to the detection signal.
  • the function of the second feedback unit can be well realized by configuring the detecting circuit and the compensating circuit to be matched to each other .
  • the de ⁇ tecting circuit comprises a first resistor and a second re ⁇ sistor serially connected, one terminal of the first resistor is connected to the constant current output terminal, one terminal of the second resistor is connected to a reference potential, and the detection signal is generated between the first resistor and the second resistor.
  • the first resistor and the second resistor herein act as sample resistors to collect a signal of the voltage of the constant current out ⁇ put terminal and to divide the voltage of the constant cur- rent output terminal to be in a voltage range suited to be fed back.
  • the com ⁇ pensating circuit comprises a first 3-terminal voltage regu ⁇ lator and a scale resistor
  • the scale resistor has one termi- nal connected between the first resistor and the second re ⁇ sistor and the other terminal connected to an output terminal of the first 3-terminal voltage regulator
  • the first 3- terminal voltage regulator has an input terminal connected between the first resistor and the second resistor and a ref- erence terminal connected to the reference potential.
  • a voltage negatively in proportion to the detection signal can be generated at the output terminal of the first 3-terminal voltage regulator.
  • the compensating circuit further comprises a bias resistor connected between the constant current output termi ⁇ nal and the output terminal of the first 3-terminal voltage regulator.
  • the bias resistor supplies a pull-up bias to the compensating circuit.
  • the compensating circuit further comprises a first current-limiting resistor that has one terminal connected to the output terminal of the first 3-terminal voltage regulator and the other terminal connected to the first feed- back unit.
  • the first current-limiting resistor restricts a specific current to act as a compensation current of the first feedback unit to be input.
  • the first 3-termimal voltage regulator is TL431 or TL432.
  • TL431 and TL432 can realize, at a low cost, the above voltage of the output terminal negatively in proportion to the voltage of the input terminal.
  • the first feedback unit comprises a fifth resis ⁇ tor and a sixth resistor serially connected to the constant voltage output terminal, and the compensation signal is input to the first feedback unit between the fifth resistor and the sixth resistor.
  • a signal can be col ⁇ lected from a node, as a feedback position of first feedback circuit, between the fifth resistor and the sixth resistor for performing a constant voltage feedback and assuring the voltage of the constant voltage output terminal to constant.
  • the compensation signal is input between the fifth resistor and the sixth resistor in case of combination of the first feedback unit and the second feedback unit.
  • the first feedback unit further comprises a sec ⁇ ond 3-terminal voltage regulator and a compensating network, an input terminal of the second 3-terminal voltage regulator is connected between the fifth resistor and the sixth resis- tor, and the compensating network is connected between an output terminal of the second 3-terminal voltage regulator and the feedback position between the fifth resistor and the sixth resistor.
  • the first feedback unit adjusts, according to the compensation signal, the voltage of the constant voltage out- put terminal to be positively correlated with the voltage of the constant current output terminal, preferably, positively in proportion to the voltage of the constant current output terminal.
  • the compensating network comprises an eighth resistor and a first capacitor serially connected.
  • the first feedback unit further comprises a sec ⁇ ond current-limiting resistor and an optical coupling element serially connected, and one terminal of the optical coupling element is connected to the output terminal of the second 3- terminal voltage regulator.
  • the optical coupling element will reflect changes of a current passing through the optical coupling element to a feedback adjusting terminal of a PWM- controlled IC at a primary side, and the PWM-controlled IC will reduce or increase an energy transfer on a primary power loop, so that the voltage of the constant voltage output ter ⁇ minal at a secondary side will be reduced or increased.
  • the present invention further relates to a feedback circuit, a driver and an illuminating device. It shall be understood that both the above general descrip ⁇ tion and the following detailed description are for illustrative and explanative purposes in order to provide further de ⁇ scription of the claimed present invention.
  • Fig. 1 is a curve of efficiencies and loads of an output of a typical constant voltage constant current unit in the prior art
  • Fig. 2 shows a feedback circuit of a first exemplary embodi ⁇ ment of the present invention
  • Fig. 3 is schematic diagram of a second feedback unit in a feedback circuit of the present invention
  • Fig. 4 is a schematic diagram of a feedback circuit of the present invention arranged in a driving circuit
  • Fig. 5 is a diagram of relations between a voltage of a con ⁇ stant voltage output terminal and a voltage of a constant current output terminal after the feedback circuit shown in Fig. 2 of the present invention is added.
  • Fig. 2 shows a feedback circuit 100 of a first exemplary embodiment of the present invention.
  • Fig. 3 is schematic dia ⁇ gram of a second feedback unit 2 in the feedback circuit 100 of the present invention.
  • Fig. 4 is a schematic diagram of the feedback circuit 100 of the present invention arranged in a driving circuit.
  • the feedback circuit 100 of the present invention is provided between a constant voltage output terminal CV_OUT of a constant volt- age unit CV and a constant current output terminal CC_OUT of a constant current unit CC.
  • the feedback cir ⁇ cuit 100 comprises a first feedback unit 1 connected to the constant voltage output terminal CV_OUT and a second feedback unit 2 connected to the constant current output terminal CC_OU .
  • the second feedback unit 2 supply a compensation signal I_CC for compensating a constant current unit CC to the first feedback unit 1.
  • the compensation signal I_CC is generated for enabling a voltage of the constant voltage output terminal CV_OUT to re- fleet changes of a voltage of the constant current output terminal CC_OUT, i.e., changes of a load.
  • the second feedback unit 2 firstly comprises a detecting circuit 3 configured to detect the voltage of the constant current output terminal CC_OUT .
  • the detecting circuit 3 comprises a first resistor Rl and a second resistor R2, wherein one terminal of the first resistor Rl is connected to the constant current output terminal CC_OUT and one terminal of the second resistor R2 is connected to a reference poten- tial, and a detection signal Udiv is generated between the first resistor Rl and the second resistor R2.
  • the first re ⁇ sistor Rl and the second resistor R2 are configured to detect a voltage of the constant current output terminal CC_OUT, i.e., the first resistor Rl and the second resistor R2 divide the voltage of the constant current output terminal CC_OUT so as to generate the detection signal Udiv to be suited to a voltage range of a first 3-terminal voltage regulator Ul to be described hereinafter.
  • the compensating circuit 4 comprises the first 3-terminal voltage regulator Ul and a scale resis ⁇ tor R3, wherein the scale resistor R3 has one terminal con ⁇ nected between the first resistor Rl and the second resistor R2, and the other terminal connected to an output terminal of the first 3-terminal voltage regulator Ul, and the first 3- terminal voltage regulator Ul has an input terminal connected between the first resistor Rl and the second resistor R2 and a reference terminal connected to the reference potential.
  • the first 3-terminal voltage regulator Ul serves the function of receiving the detection signal Udiv generated after the voltage division by the first resistor Rl and the second re ⁇ sistor R2 and generating a negatively correlated voltage with the detection signal Udiv, preferably, a voltage negatively in proportion to the detection signal Udiv , at the output terminal of the first 3-terminal voltage regulator Ul .
  • the scale resistor R3 is a scale factor and configured to adjust a proportion of the voltage of the output terminal to the voltage of the input terminal of the first 3-terminal voltage regulator Ul that optionally is a voltage regulator TL431, TL432, etc.
  • the compensating circuit 4 further comprises a first current-limiting resistor R4 and a bias resistor R9, wherein the bias resistor R9 has one terminal connected to the constant current output terminal CC_OUT and the other terminal connected to the output terminal of the first 3- terminal voltage regulator Ul and the other terminal of the scale resistor R3, the first current-limiting resistor R4 has one terminal connected to the output terminal of the first 3- terminal voltage regulator Ul and the other terminal con ⁇ nected to a feedback terminal of the first feedback unit 1, i.e., to a node as feedback position of first feedback unit 1, between a fifth resistor R5 and a sixth resistor R6 of the first feedback unit 1, and wherein R4 is a current-limiting resistor that restricts a specific current as a compensation current to be supplied to the first feedback unit 1 or a con ⁇ stant voltage feedback loop, and the bias resistor R9 sup ⁇ plies a pull-up bias to the compensating circuit 4.
  • the bias resistor R9 has one terminal connected to the constant current output terminal
  • the first feedback unit 1 comprises the fifth resistor R5 and the sixth resistor R6 serially connected to the constant voltage output terminal CV_OUT, a second 3-terminal voltage regulator U2 and an eighth resistor R8 and a first capacitor CI serially connected as a compensating network in the pre ⁇ sent exemplary embodiment.
  • An input terminal of the second 3-terminal voltage regulator U2 is connected between the fifth resistor R5 and the sixth resistor R6, and the compensating network is connected between an output terminal of the second 3-terminal voltage regulator U2 and the node between the fifth resistor R5 and the sixth resistor R6, conse- quently, in the situation that the compensation signal I_CC is not supplied, using the second 3-terminal voltage regula ⁇ tor U2 and the compensating network, an output voltage of the second 3-terminal voltage regulator U2 negatively reflects a relation between the voltage of the constant voltage output terminal CV_OUT and a preset value thereof, thus, the voltage of the constant voltage output terminal CV_OUT can be ad ⁇ justed to be constant, that is, the voltage of the constant voltage output terminal CV_OUT is maintained to be the same as the preset value thereof.
  • an operation principle of the first feedback unit 1 is: the fifth resistor R5 and the sixth resistor R6 constitute a voltage divider to sample the voltage of the constant voltage output terminal CV_OUT, i.e., the fifth resistor R5 and the sixth resistor R6 divides the voltage of the constant voltage output terminal CV_OUT and then supply the divided voltage to the second 3-terminal voltage regulator U2.
  • the eighth resistor R8 and the first capacitor CI bridge the input terminal and the output termi ⁇ nal of the second 3-terminal voltage regulator U2 to act as the compensating network.
  • a voltage of the output terminal of the second 3-terminal voltage regulator U2 negatively re ⁇ flects a relation between the voltage of the constant voltage output terminal CV_OUT and a preset value thereof.
  • R7 is a current-limiting resistor. Specifically, when the voltage of the constant voltage output terminal CV_OUT is higher than the preset value thereof, a voltage of the input terminal of the second 3-terminal voltage regulator U2 also will rise, and the voltage of the output terminal of the second 3- terminal voltage regulator U2 will be reduced, consequently, a current flowing through the current-limiting resistor R7 and an optical coupling element will be increased, the opti ⁇ cal coupling element will reflect changes of the current to a feedback adjusting terminal of a PWM-controlled IC at a pri ⁇ mary side, the main IC will control a main power loop to re ⁇ cute an energy transfer on a primary power loop, so that the voltage of the constant voltage output terminal CV_OUT at a secondary side will be reduced. On the contrary, if the voltage of the constant
  • an operation principle of the first feedback unit 1 and the sec ⁇ ond feedback unit 2 jointly realizing a feedback is: when the voltage of the constant current output terminal CC_OUT is re ⁇ Jerusalem, the voltage after being divided by the first resistor Rl and the second resistor R2, i.e., the voltage of the de ⁇ tection signal Udiv (as the voltage of the input terminal of the first 3-terminal voltage regulator Ul), is reduced, then, the voltage of the output terminal of the first 3-terminal voltage regulator Ul will be increased negatively in propor- tion to the voltage of the detection signal, consequently, the current passing through the current-limiting resistor R4 and flowing into the input terminal of the second 3-terminal voltage regulator U2 will be increased, thus, the voltage of the constant voltage output terminal CV_OUT will be adjusted to be low.
  • the feedback circuit 100 of the present invention by using the second feedback unit 2, provide the compensation signal I_CC that is negatively correlated with, preferably, nega ⁇ tively in proportion to, the voltage of the constant current output terminal CC_OUT, and by further using the first feed ⁇ back unit 1, adjusts the voltage of the constant voltage out- put terminal CV_OUT to be positively correlated with, pref ⁇ erably, positively in proportion to, the voltage of the con ⁇ stant current output terminal CC_OU .
  • Fig. 5 is a diagram of relations between the voltage of a constant voltage output terminal CV_OUT and the voltage of the constant current output terminal CC_OUT after the feed ⁇ back circuit shown in Fig. 2 of the present invention is added. As can be seen from Fig. 5, the two are positively correlated, and are substantially positively correlated in proportion.
  • the voltage of the constant voltage output ter- minal CV_OUT and the voltage of the constant current output terminal CC_OUT substantially have a substantially linear re ⁇ lation.
  • the feedback circuit of the present invention can be provided in a driving circuit.
  • a driving circuit In both a single flyback topology in a TM (transition-mode) mode and a buck topology in a fixed fre ⁇ quency mode, the power loss above is small.
  • the driving cir ⁇ cuit of the present invention can maintain an appropriate in ⁇ put voltage of the constant current unit CC since the output voltage of the constant voltage unit CV is reduced when the load is low.
  • a buck circuit operates on a kHz switching frequency, then the switching loss, the gate driving loss on MOSFET and the loss on the catch diode and the loss on inductance occupy a main part in the total power loss, and these losses are all reduced correspondingly as the input voltage of the constant current unit CC is reduced.
  • an average operation fre ⁇ quency is more stable.
  • the present invention may have vari ⁇ ous alterations and changes. Any alterations, equivalent substitutions, improvements, within the spirit and principle of the present invention, should be covered in the protection scope of the present invention.

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  • Dc-Dc Converters (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)

Abstract

La présente invention concerne un circuit de retour d'information (100) pour un circuit d'attaque, le circuit de commande comprenant une unité de tension constante (CV) comme premier étage et une unité de courant constant (CC) comme second étage, caractérisé en ce que le circuit de retour d'information (100) comprend une première unité de retour (1) connectée à une borne de sortie de tension constante (CV_OUT) de l'unité de tension constante (CV) et une seconde unité de retour (2) connectée à une borne de sortie de courant constant (CC_OUT) de l'unité de courant constant (CC), la seconde unité de retour (2) produit un signal de compensation (I_CC) en fonction d'une tension de la borne de sortie de courant constant (CC_OUT) et fournit le signal de compensation (I_CC) à la première unité de retour (1), la première unité de retour (1) ajuste une tension de la borne de sortie de tension constante (CV_OUT) en fonction du signal de compensation (I_CC) afin qu'elle soit positivement corrélée à la tension de la borne de sortie de courant constant (CC_OUT). Le circuit de retour d'information (100) selon la présente invention a une grande universalité et des avantages de grande efficacité et d'économie d'énergie.
PCT/EP2012/073970 2011-12-23 2012-11-29 Circuit de retour d'information pour commande de marge de tension, circuit d'attaque et dispositif d'éclairage Ceased WO2013092162A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2011104368856A CN103179729A (zh) 2011-12-23 2011-12-23 反馈电路、驱动器以及照明装置
CN201110436885.6 2011-12-23

Publications (1)

Publication Number Publication Date
WO2013092162A1 true WO2013092162A1 (fr) 2013-06-27

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PCT/EP2012/073970 Ceased WO2013092162A1 (fr) 2011-12-23 2012-11-29 Circuit de retour d'information pour commande de marge de tension, circuit d'attaque et dispositif d'éclairage

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WO (1) WO2013092162A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112291886B (zh) * 2020-11-04 2025-02-07 欧普照明股份有限公司 控制电路及照明装置

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080290906A1 (en) * 2007-05-22 2008-11-27 Ite Tech. Inc. Constant-current driving circuit
WO2008144961A1 (fr) * 2007-05-31 2008-12-04 Texas Instruments Incorporated Régulation de chaînes de led
US20110012519A1 (en) * 2009-07-17 2011-01-20 Freescale Semiconductor, Inc. Analog-to-digital converter with non-uniform accuracy
US20110080110A1 (en) * 2009-10-07 2011-04-07 Lutron Electronics Co., Inc. Load control device for a light-emitting diode light source
US20110085576A1 (en) * 2009-10-09 2011-04-14 Analog Modules Inc. Smart linear pulsed laser diode driver, and method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080290906A1 (en) * 2007-05-22 2008-11-27 Ite Tech. Inc. Constant-current driving circuit
WO2008144961A1 (fr) * 2007-05-31 2008-12-04 Texas Instruments Incorporated Régulation de chaînes de led
US20110012519A1 (en) * 2009-07-17 2011-01-20 Freescale Semiconductor, Inc. Analog-to-digital converter with non-uniform accuracy
US20110080110A1 (en) * 2009-10-07 2011-04-07 Lutron Electronics Co., Inc. Load control device for a light-emitting diode light source
US20110085576A1 (en) * 2009-10-09 2011-04-14 Analog Modules Inc. Smart linear pulsed laser diode driver, and method

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