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WO2015196443A1 - Circuit gradateur à découpage de phase pour lampe à diodes électroluminescentes - Google Patents

Circuit gradateur à découpage de phase pour lampe à diodes électroluminescentes Download PDF

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Publication number
WO2015196443A1
WO2015196443A1 PCT/CN2014/080930 CN2014080930W WO2015196443A1 WO 2015196443 A1 WO2015196443 A1 WO 2015196443A1 CN 2014080930 W CN2014080930 W CN 2014080930W WO 2015196443 A1 WO2015196443 A1 WO 2015196443A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit
phase
voltage
cut dimmer
cut
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/CN2014/080930
Other languages
English (en)
Chinese (zh)
Inventor
焦宇飞
缑从军
叶培德
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.)
Wca Lighting (dongguan) Co Ltd
WAC Lighting Co
Original Assignee
Wca Lighting (dongguan) Co Ltd
WAC Lighting Co
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 Wca Lighting (dongguan) Co Ltd, WAC Lighting Co filed Critical Wca Lighting (dongguan) Co Ltd
Priority to CN201480037366.4A priority Critical patent/CN105580499B/zh
Priority to PCT/CN2014/080930 priority patent/WO2015196443A1/fr
Publication of WO2015196443A1 publication Critical patent/WO2015196443A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source

Definitions

  • the present invention relates to the field of LED dimming technology, and more particularly to a phase-cut dimming circuit for an LED lamp.
  • LED lighting fixtures have the advantages of energy saving, environmental protection and long life. More and more lighting occasions use LED lighting fixtures instead of traditional incandescent lamps to achieve lighting. It includes many occasions where dimming is required for illumination.
  • phase-cut dimming technology uses a thyristor device as a high-speed switch to control the electrical energy transmitted from the mains to the luminaire by "cutting off" the sinusoidal supply voltage waveform.
  • the phase-cut dimmer uses high-power switching devices, so it is inevitable that high-power LED bulbs will be used.
  • the phase-cut dimmers formed by the switching devices interact with each other. If the interaction between the dimmer and the LED bulb is unstable, visible flicker will occur.
  • the timing trigger circuit triggers the thyristor. Because the voltage is too small, the thyristor cannot reach the minimum conduction current of the thyristor at one time. The thyristor cannot be realized at one time. Pass, need to trigger multiple times to work, resulting in LED lighting fixtures flashing and unstable;
  • the trailing edge phase-cut dimmer has opposite phase-cutting directions, so that the first three aspects cause relatively few problems with respect to the leading edge phase-cut dimmer, but in the fourth aspect, the two phase-cut dimming methods LED lighting fixtures will flash and be unstable.
  • a dimmable LED module as disclosed in, for example, the patent publication No. CN 102 598 856 A, which incorporates a bleeder circuit in the circuit, the bleeder circuit selectively acting to extract during a supply voltage amplitude below a threshold The bleeder current, in which the bleeder circuit provides a dummy load.
  • the object of the present invention is to avoid the above-mentioned deficiencies in the prior art and to provide a phase-cut dimming circuit capable of effectively preventing flashing of an LED lamp using phase-cut dimming while avoiding a large amount of additional energy loss and heat loss. .
  • the design idea of the dimming circuit is: By further analyzing the cause of the flashing of the LED lamp, as shown in Fig. 1, it can be found that the main flicker occurs because the phase-cut angle is too large (that is, the conduction angle is too small) or the LED
  • the working power of the luminaire is too small, that is, when the current transmitted from the driving circuit to the LED luminaire is less than a certain value, the circuit repeatedly rises and falls due to various reasons (see background analysis), and the LED luminaire is repeatedly turned on and off.
  • the flicker is generated. Therefore, as shown in FIG. 2, as long as the current of the LED circuit is stopped when the current transmitted from the driving circuit to the LED lamp is less than a certain value, the occurrence of flicker can be effectively prevented.
  • the phase-cut dimming circuit of the LED lamp comprises a mains input end, a phase-cut dimmer connected to the mains input end, a driving circuit connected to the phase-cut dimmer, and the driving circuit is subjected to phase-cut dimming
  • the phase-adjusted mains input is converted into a direct current output, and the output end of the driving circuit is connected to the LED load via an anti-flicker circuit, the anti-flash Real-time monitoring of the output current value of the driving circuit circuit, and the transfer to the LED voltage across the load is less than the operating voltage of the LED load when the output current value is less than a preset value.
  • the anti-flicker circuit includes a detection circuit for monitoring the output current value of the drive circuit in real time, a comparison circuit for acquiring the detection signal output by the detection circuit in real time, and a switching circuit controlled by the comparison circuit, wherein the comparison circuit detects When the detection signal of the detection circuit is less than a preset value, the switching circuit is controlled to be triggered such that the voltage across the LED load is less than the LED load operating voltage.
  • the anti-flicker circuit further includes a delay power supply circuit, and the switching circuit obtains a working voltage through a delay power supply circuit, and the delay power supply circuit is turned off and delayed by a predetermined time value when the phase-cut dimming circuit is started. Automatic conduction to supply the switching circuit with an operating voltage.
  • the anti-flicker circuit further includes a reference power supply circuit, and the detection signal of the detection circuit is boosted by the first reference voltage provided by the reference power supply circuit and then transmitted to the comparison circuit.
  • the comparison circuit includes a comparator A1, and the reference source circuit provides a second reference voltage to the comparator A1.
  • the reference voltage terminal, the detection signal of the detection circuit is boosted by the first reference voltage provided by the reference power supply circuit, and then transmitted to the comparison signal terminal of the comparison circuit.
  • the comparison circuit includes a controlled switch U2, the controlled switch U2 has a third reference voltage built therein, and the detection signal of the detection circuit is boosted by the first reference voltage provided by the reference power supply circuit. It is transmitted to the controlled end of the controlled switch U2, which compares the signal received by the controlled terminal with the third reference voltage and turns on/off accordingly.
  • the output end of the driving circuit includes a positive output line and a negative output line
  • the switching circuit includes a step-down branch spanning between the positive output line and the negative output line, and the switching circuit is stepped down when triggered.
  • the branch is turned on to reduce the positive output line and the negative output line to be less than the LED load operating voltage.
  • the step-down branch includes a step-down resistor R16 and a controlled switch tube Q2 connected in series with the step-down resistor R16, and the controlled switch tube Q2 is controlled to be turned on when the switching circuit is triggered.
  • the switching circuit includes a switching module connected in series with an output end of the driving circuit, and the switching module is disconnected when the switching circuit is triggered.
  • the detecting circuit includes a detecting resistor R19 connected in series with the output end of the driving circuit and a shunt diode D6 connected in parallel with the detecting resistor R19. When the voltage across the detecting resistor is greater than the turn-on voltage of the shunt diode D6, The shunt diode is turned on.
  • the present invention provides a phase-cut dimming circuit for an LED lamp, wherein an output end of the driving circuit of the circuit is connected to the LED load via an anti-flicker circuit, and the anti-flicker circuit includes real-time monitoring of the output current of the driving circuit
  • the comparison circuit detects that the detection signal of the detection circuit is less than the preset value, that is, the output current of the drive circuit is over Small will cause the LED luminaire to flicker, so the control switching circuit is triggered to make the output voltage of the driving circuit less than the LED load working voltage, that is, the LED lamp stops working and avoids flicker; when the output current of the driving circuit rises sufficiently, then compare
  • the circuit detects that the detection signal of the detection circuit is greater than the preset value the trigger of the switching circuit is stopped at this time, and the voltage of the output end of the driving circuit rises to the working voltage of the
  • FIG. 1 is a waveform diagram showing changes in output current of a driving circuit of the prior art as a function of a conduction angle of a phase-cut dimmer.
  • 2 is a waveform diagram showing changes in the output current of the driving circuit of the present invention as a function of the conduction angle of the phase-cut dimmer.
  • 3 is a circuit block diagram of Embodiment 1 of a phase-cut dimming circuit for an LED lamp of the present invention.
  • Figure 4 is a circuit diagram of a driving circuit of Embodiment 1 of a phase-cut dimming circuit for an LED lamp of the present invention.
  • Figure 5 is a circuit diagram of an anti-flicker circuit of Embodiment 1 of a phase-cut dimming circuit for an LED lamp of the present invention.
  • Figure 6 is a circuit diagram of an anti-flicker circuit of Embodiment 2 of a phase-cut dimming circuit for an LED lamp of the present invention.
  • Figure 7 is a circuit block diagram of Embodiment 3 of a phase-cut dimmer circuit for an LED lamp of the present invention.
  • phase-cut dimming circuit for an LED lamp includes: a mains input terminal, and an alternating current input from a mains input terminal sequentially passes through a phase-cut dimmer, a driver. The circuit 2 and the anti-flicker circuit are then transferred to the LED load.
  • the phase-cut dimmer adopts a leading edge phase-cut dimmer M0V1 composed of a thyristor for phase-cutting the sinusoidal current input from the mains to control the electric energy transmitted from the mains to the driving circuit 2.
  • a trailing edge phase dimmer can also be used, and those skilled in the art can flexibly select a suitable phase cut dimmer in the existing phase cut dimmer as needed.
  • the driving circuit 2 of the present embodiment is realized based on the FL7730 type driving chip U1, and the output end of the driving circuit 2 includes a positive output line V0+ and a negative output line V0-.
  • the driver chip of the FL7730 type is a driver chip designed by Fairchild Semiconductor for the LED dimming circuit.
  • the chip can be used by those skilled in the art to construct the corresponding driving circuit 2 in conjunction with the related literature, and the main function of the driving circuit 2 is
  • the AC output of the phase-cut dimmer is converted into a DC output, and the output current value is positively correlated with the conduction phase angle of the phase-cut dimmer.
  • the driving circuit 2 can also be implemented by using other driving circuit 2 schemes. There are many different options available in the industry, as long as the phase-cut dimmer can be phase-adjusted and the output AC power is converted into DC output can be.
  • the anti-flicker circuit of this embodiment includes a detecting circuit 31, a comparing circuit 32, a switching circuit 33, a delay supply circuit 34, and a reference power supply circuit 35.
  • the detecting circuit 31 includes a detecting resistor R19 disposed on the negative output line V0-.
  • the voltage across the detecting resistor R19 changes according to the current change on the negative output line V0-.
  • the detecting resistor R19 is connected in parallel with the shunt diode D6.
  • the voltage of the sense resistor is limited to a maximum of 0. 3V.
  • the voltage of the sense resistor is limited to a maximum of 0. 3V when the voltage across the shunt diode D6 is greater than 0.3V.
  • the conventional current detecting circuit In order to reduce the influence on the circuit and the power loss, the conventional current detecting circuit generally uses a transformer, a low-resistance resistor (milli-ohm grade) and an accurate low-resistance manganese-copper wire, but this causes detection accuracy.
  • a transformer a low-resistance resistor (milli-ohm grade) and an accurate low-resistance manganese-copper wire
  • this circuit uses the detection resistor R19 combined with the points
  • the flow diode D6 constitutes a scheme of the detecting circuit 31, and the detecting resistor R19 can use a resistor having a higher resistance value, which is advantageous for improving the detection accuracy, especially in the case where the current is relatively small, and on the other hand, when the current is large enough to make the resistor
  • the shunt diode D6 can be turned on and off, so that the resistance value of the detecting resistor R19 is not higher than 0. 3V, and it is guaranteed that the voltage at both ends is not too high. Lead to high power losses.
  • the detection circuit 31 cannot continuously detect the rise of the current after reaching the 0.
  • the detection circuit 31 can be mainly detected from FIG. 1 and FIG. 2 in combination with the principle of the present technology.
  • the interval lies in the small current interval.
  • the detection circuit 31 can be used in the circuit to meet the detection requirement, and at the same time, the detection accuracy and the low power loss can be achieved. effect.
  • the turn-on voltage of the shunt diode D6 can be flexibly adjusted by paralleling or connecting a plurality of diodes in series.
  • the reference power supply circuit 35 is composed of a three-terminal adjustable shunt reference source chip U3.
  • the specific chip U3 is model TL431, the cathode and the control pole of the chip U3 are connected to the positive output line V0+ via the resistor R24, and the anode of the chip U3 is connected to the negative output.
  • the circuit analysis shows that the voltage value of the connection point of the resistor R21 and the resistor R20 is equal to the voltage value across the detecting resistor R19 plus The voltage value across the resistor R20, so the comparison signal obtained by the comparison signal terminal of the comparison circuit 32 is the voltage value across the sense resistor R19 plus The voltage across resistor R20.
  • the reason why the reference circuit is used to boost the detected value and then to the comparison circuit 32 is because the detection value of the detection circuit 31 is relatively small (as described above, in order to achieve low power loss), in the comparison circuit. It is difficult to be directly compared in 32, so a certain boosting process is required. Of course, if other detecting circuits 31 are used to make the detected value large enough, or other boosting circuits are used to boost the detected value, it may not be in the circuit.
  • a reference power supply circuit 35 is provided.
  • the comparison circuit 32 includes a controlled switch U2, the cathode of the controlled switch U2 is connected to the controlled end of the switching circuit 33, the anode and the negative output line V0-, and the control electrode is the comparison signal terminal of the comparison circuit 32, connected to the resistor R21 and The connection point of the resistor R20.
  • the controlled switch U2 is a three-terminal adjustable shunt reference source chip TL431. Since it has a built-in 2. 5V reference voltage, it does not need to be supplied with a reference voltage when it is used as a comparator. The controlled switch U2 will automatically control its control pole. The detected voltage value is compared to the built-in reference voltage.
  • the voltage of the control electrode ie, the detected value plus the first reference voltage
  • the built-in reference voltage of the controlled switch U2 is greater than the built-in reference voltage of the controlled switch U2
  • the controlled switch U2 is at In the on state, the controlled terminal of the switching circuit 33 is in the low state, and the switching circuit 33 is inactive.
  • the voltage of the control electrode ie, the detected value plus the first reference voltage
  • the built-in reference voltage of the switch U2 is controlled, and the controlled switch U2 is in an off state.
  • the controlled end of the switching circuit 33 is in a high state, and the switching circuit 33 is triggered.
  • the use of a controlled switch with a built-in reference voltage as the main component of the comparison circuit 32 can simplify the structure of the circuit, but the adjustment of the above preset value can only be adjusted by adjusting the first reference voltage (ie, the adjustment resistor R20 and the resistor R21). to realise.
  • the switching circuit 33 includes a step-down branch formed by a resistor R16 and a transistor Q3.
  • the collector of the transistor Q3 is connected to the positive output line V0+ via a resistor R16, and the emitter of the transistor Q3 is connected to the negative output line V0-, the base of the transistor Q3. That is, the controlled end of the switching circuit 33 is connected to the cathode of the controlled switch.
  • the base of the transistor Q3 receives the low level signal, the transistor Q3 is turned off, the switching circuit 33 does not work, and has no effect on the overall circuit; when the base of the pole tube Q2 receives the high level signal, the transistor Q3 is turned on.
  • the resistor R16 is connected across the positive output line V0+ and the negative output line V0-, that is, the LED load is connected in parallel with the resistor R16, thereby reducing the voltage at the output end of the driving circuit 2 (the voltage across the LED load), so that the LED load stops working and avoids flicker.
  • the resistance of the resistor R16 By designing the resistance of the resistor R16, the falling value of the output voltage of the driving circuit 2 can be adjusted. The falling value must ensure that the output voltage of the driving circuit 2 can fall below the operating voltage of the LED load, and even the driving circuit 2 can be made.
  • the output voltage drop value is below the operating voltage of the drive circuit 2, so that the drive circuit 2 also stops operating and is in an outputless state.
  • the delay power supply circuit 34 includes a transistor Q2 and a delay circuit.
  • the emitter of the transistor Q2 is connected to the positive output line V0+, the collector is connected to the controlled end of the switching circuit 33 via the resistor R14, and the base is connected to the positive output via a delay circuit. Line V0+.
  • the transistor Q2 In the operating state, the transistor Q2 is in an on state, so that the controlled end of the switching circuit 33 (the cathode of the controlled switch U2) is connected to the positive output line V0+ via the resistor R14, which provides a high acquisition for the controlled end of the switching circuit 33.
  • the level is possible (or the pull-up resistor R14 is provided for the comparison circuit 32).
  • the transistor Q2 will delay the conduction due to the delay of the delay circuit.
  • the controlled terminal of the switching circuit 33 is not connected to the positive output line V0+ without the resistor R14.
  • the high level is obtained, that is, the switching circuit 33 cannot be in the working state, that is, in the circuit starting process, there is a certain time gap in which the switching circuit 33 never works, because the detecting circuit 31 is in the circuit starting phase.
  • the detected current is zero.
  • the delay power supply circuit 34 can ensure that the switching circuit 33 does not operate in the startup phase and affects the startup of the circuit.
  • the basic principle of the anti-flicker circuit is that the detecting resistor R19 generates a detected voltage value (less than or equal to the turn-on voltage of the shunt diode D6) according to the output current of the driving circuit 2, and the detected voltage value is provided by the reference voltage circuit.
  • a signal to be compared is formed, and the signal to be compared is transmitted to the comparison circuit 32, and the circuit 32 is compared with
  • the built-in reference voltage is compared, and when the signal to be compared is smaller than the built-in reference voltage (ie, the output current of the driving circuit 2 is less than a preset value), the switching circuit 33 is triggered, and the switching circuit 33 passes the conductor buck branch to make the output of the driving circuit 2
  • the voltage can drop below the operating voltage of the LED load, causing the LED load to stop working and avoid flicker.
  • the circuit also provides a time delay supply circuit 34 to ensure that switching circuit 33 does not affect the normal startup of the circuit during the startup phase. Therefore, through the circuit, the LED luminaire can be extinguished when the LED luminaire flickers to prevent flicker, and there is no need to provide an additional bleeder circuit to avoid a large amount of energy loss.
  • the second embodiment of the present invention is the same as that of the first embodiment.
  • the main technical solution of the embodiment is the same as that of the first embodiment.
  • this embodiment differs from the first embodiment in that the comparison circuit 32 is constituted by a comparator (or operational amplifier) A1 to constitute a comparison circuit 32.
  • the inverting input terminal of the comparator A1 is connected as a comparison signal terminal to a connection point of the resistor R21 and the resistor R20, and the non-inverting input terminal acquires a second reference voltage provided by the reference voltage circuit, and the output terminal is connected to the controlled terminal of the switching circuit 33.
  • the reference voltage circuit provides a second reference voltage by connecting a second voltage dividing branch formed by connecting a resistor R24 and a resistor R25 in series between the cathode and the anode of the chip U3, and the second voltage dividing branch connects the cathode of the chip U3 and
  • the reference voltage between the anodes is divided to generate a second reference voltage. Therefore, the second reference voltage of the comparison circuit 32 can be adjusted by mainly adjusting the ratio of the resistor R24 to the resistor R25.
  • this embodiment may be complicated in circuit structure, but it is more convenient to adjust the preset value (either by setting the first reference voltage or setting the second reference voltage).
  • the third embodiment of the present invention is the same as that of the first embodiment.
  • the main technical solution of the embodiment is the same as that of the first embodiment.
  • the switching circuit 33 includes a switching module connected in series with the output end of the driving circuit 2, and the switching module is turned off when the switching circuit 33 is triggered, thereby completely turning off.

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

Abstract

Cette invention concerne un circuit gradateur à découpage de phase pour une lampe à DEL, comprenant une entrée d'alimentation secteur, un gradateur à découpage de phase connecté à l'entrée d'alimentation secteur, et un circuit d'attaque (2) connecté au gradateur à découpage de phase; le circuit d'attaque (2) transforme en courant continu l'entrée d'alimentation secteur qui a été ajustée par découpage de phase par le gradateur à découpage de phase et fournit en sortie ledit courant, et une sortie du circuit d'attaque est connectée à une charge de DEL par l'intermédiaire d'un circuit de prévention de scintillement; le circuit de prévention de scintillement comprend un circuit de détection (31), un circuit de comparaison (32), un circuit de commutation (33), un circuit d'alimentation à retard (34) et un circuit d'alimentation électrique de référence (35); et le circuit de prévention de scintillement surveille ponctuellement une valeur de courant de sortie du circuit d'attaque, et réduit la tension transmise au deux extrémités de la charge de DEL de façon à ce qu'elle soit inférieure à une tension de fonctionnement de la charge de DEL quand la valeur de courant de sortie est inférieure à une valeur prédéfinie.
PCT/CN2014/080930 2014-06-27 2014-06-27 Circuit gradateur à découpage de phase pour lampe à diodes électroluminescentes Ceased WO2015196443A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN201480037366.4A CN105580499B (zh) 2014-06-27 2014-06-27 一种用于led灯的切相调光电路
PCT/CN2014/080930 WO2015196443A1 (fr) 2014-06-27 2014-06-27 Circuit gradateur à découpage de phase pour lampe à diodes électroluminescentes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2014/080930 WO2015196443A1 (fr) 2014-06-27 2014-06-27 Circuit gradateur à découpage de phase pour lampe à diodes électroluminescentes

Publications (1)

Publication Number Publication Date
WO2015196443A1 true WO2015196443A1 (fr) 2015-12-30

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PCT/CN2014/080930 Ceased WO2015196443A1 (fr) 2014-06-27 2014-06-27 Circuit gradateur à découpage de phase pour lampe à diodes électroluminescentes

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CN (1) CN105580499B (fr)
WO (1) WO2015196443A1 (fr)

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WO2021169210A1 (fr) * 2020-02-28 2021-09-02 广州市浩洋电子股份有限公司 Dispositif de gradation de del utilisé pour accélérer une décharge d'énergie inductive à source de courant constant

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CN112584577A (zh) * 2020-12-25 2021-03-30 无锡安特源科技股份有限公司 一种用于切相调光电源的维持电流电路

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CN102598856A (zh) * 2009-10-14 2012-07-18 特里多尼克英国有限公司 Led的切相调光
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CN103004290A (zh) * 2010-07-13 2013-03-27 皇家飞利浦电子股份有限公司 用于防止不适当的调光操作的泄放电路和相关方法
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Publication number Priority date Publication date Assignee Title
WO2021169210A1 (fr) * 2020-02-28 2021-09-02 广州市浩洋电子股份有限公司 Dispositif de gradation de del utilisé pour accélérer une décharge d'énergie inductive à source de courant constant
US11849513B2 (en) 2020-02-28 2023-12-19 Guangzhou Haoyang Electronic Co., Ltd. LED dimming device with high refresh rate and smooth dimming

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