WO2015024224A1 - Circuit à courant constant de del et lampe à del - Google Patents

Circuit à courant constant de del et lampe à del Download PDF

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Publication number
WO2015024224A1
WO2015024224A1 PCT/CN2013/082026 CN2013082026W WO2015024224A1 WO 2015024224 A1 WO2015024224 A1 WO 2015024224A1 CN 2013082026 W CN2013082026 W CN 2013082026W WO 2015024224 A1 WO2015024224 A1 WO 2015024224A1
Authority
WO
WIPO (PCT)
Prior art keywords
capacitor
circuit
led
bridge rectifier
constant current
Prior art date
Application number
PCT/CN2013/082026
Other languages
English (en)
Chinese (zh)
Inventor
刘晓峰
Original Assignee
Liu Xiaofeng
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 Liu Xiaofeng filed Critical Liu Xiaofeng
Priority to PCT/CN2013/082026 priority Critical patent/WO2015024224A1/fr
Priority to CN201380057433.4A priority patent/CN104813745B/zh
Publication of WO2015024224A1 publication Critical patent/WO2015024224A1/fr

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
    • 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
    • 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]
    • H05B45/375—Switched mode power supply [SMPS] using buck topology
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the present invention relates to the field of LED lighting, and more particularly to an LED constant current circuit and an LED lamp. Background technique
  • LED luminaires will not be replaced in the original lighting and electronic transformers for replacement and cost savings.
  • the original electronic transformer is designed for halogen lamps.
  • the electronic transformer is designed with under-power protection and over-power protection. When the load power is too low and enters its protection range, the electronic transformer will be in intermittent output state. When the power is too high, the electronic transformer will also turn off the output. Only when the load power is kept within a certain range, the electronic transformer can work normally and output.
  • Figure 1 shows a common LED step-down constant current drive circuit. When connected to the AC (DC) power supply, it is rectified by the bridge rectifier circuit DB, capacitor C1 is filtered, and then the buck constant current control chip provides a constant operating current to the LED.
  • the biggest disadvantage of Figure 1 is that if the input voltage is rectified and filtered, if the voltage on C1 is lower than Vled+Vmos+Vic+VRs, the LED brightness is lower than the normal value, or even not at all.
  • Vied is the forward voltage drop of the LED string
  • Vmos is the MOSFET tube voltage drop
  • Vic is the IC constant current threshold voltage
  • VRs is the sense resistor voltage drop.
  • Figure 2 is also an LED boost constant current drive circuit with more applications. When connected to the AC/DC power supply, it is rectified by the bridge rectifier circuit DB, filtered by the capacitor C1, and boosted by the constant current. The control chip provides the rated operating current for the LED.
  • the disadvantages are: If the load LED has a small number of series connections (requires a low output voltage), the boost controller will not be able to pass the voltage on C1 higher than the output LED voltage. Stabilizes the output current, causing abnormal brightness and even damaging the LED.
  • the circuit can work normally when the input voltage is lower than the output voltage. However, if the input voltage is higher or equal to the output voltage, it will not work normally. If the input is an electronic transformer, because the output of the electronic transformer oscillates a high-frequency intermittent pulse voltage of different amplitudes, and the frequency and amplitude of the voltage pulse voltage of the output of different electronic transformers will be different. If C1 is charged and discharged, This causes C1 to reduce the service life due to the equivalent series resistance heating, and also has the problem described above in Figure 1 causing the LED to flicker.
  • Figure 3 is a relatively good LED driver circuit. Due to the use of the buck-boost structure, the deficiencies in Figure 1 and Figure 2 can be solved to a certain extent. However, due to the existence of C1, the driver may still be connected.
  • the electronic transformer When entering the electronic transformer, especially when protecting the electronic transformer with low current point, the electronic transformer enters the overcurrent protection state without output due to the charging of C1, and the operating voltage of the boost controller in Fig. 3 (Vin ) is obtained from the previous C1, which will cause the voltage at the C1 terminal to be lower than the normal operating voltage of the chip during operation, resulting in the voltage of the latter stage (both ends of C2) being too low, so that the step-down constant current circuit cannot work. Under normal circumstances, the LED flashes, but the probability of flicker is much smaller than that of Figures 1 and 2. It is compatible with some electronic transformers.
  • control ICs in the circuits of Figures 2 and 3 are all taken from the C1 terminal.
  • the voltage across C1 cannot be guaranteed to be higher than the startup voltage of the control IC.
  • the control IC will work in the interval.
  • the voltage across C2 in Figure 3 will appear lower than the operating voltage of the subsequent step-down constant current circuit, and is also in intermittent operation. Table Now the human eye can recognize that the LED light flashes.
  • the invention provides an LED constant current circuit and an LED lamp, which are used for solving the circuit instability problem caused by the electronic transformer of the prior art for powering the LED lamp.
  • an LED constant current circuit is provided, and the following technical solutions are adopted:
  • LED constant current circuit including bridge rectifier circuit, sampling circuit and step-down constant current circuit, also includes:
  • a first capacitor for charging the first capacitor when a voltage of the first capacitor is lower than an output voltage of the bridge rectifier circuit, wherein the first charging circuit is respectively connected to the a bridge rectifier circuit and the first capacitor; a second charging circuit for charging the first capacitor when an output voltage of the bridge rectifier circuit is higher than a voltage of the first capacitor
  • Two charging circuits respectively connect the bridge rectifier circuit and the first capacitor.
  • the first charging circuit includes: a second capacitor, the first end is connected to the bridge rectifier circuit; the first resistor is connected to the second end of the second capacitor, and the second end is connected to the second end The positive pole of the first capacitor.
  • the second charging circuit includes: an inductor, the first end is connected to the bridge rectifier circuit;
  • a diode a diode, a first end connected to the second end of the first inductor, and a second end connected to the anode of the first capacitor;
  • the sampling circuit includes: a second resistor, the first end is connected to the anode of the first capacitor; the third resistor is connected to the second end of the second resistor, and the second end is connected to the second end The negative pole of a capacitor.
  • the first end of the step-down constant current circuit is connected to the third resistor, and the second end is connected to the second resistor through a target LED lamp.
  • an LED luminaire is provided, and the following technical solution is adopted:
  • LED luminaires including the above-mentioned LED constant current circuit.
  • the LED lamp further includes an electronic transformer, and the electronic transformer is connected to the LED constant current circuit through a bridge rectifier circuit of the LED lamp.
  • the present invention avoids causing over-power protection of the electronic transformer by removing the filter capacitor after the bridge rectifier circuit DB.
  • the overcurrent protection of the electronic transformer is triggered at the moment of power-on, and the reliability of the circuit is greatly improved.
  • the first capacitor is supplied through two channels. Since the capacitor voltage cannot be abruptly changed, the inductor current cannot be abruptly changed, so the two sets of currents charged for the first capacitor have a phase difference, and the first capacitor has two The voltage at the terminal is also more stable.
  • the boost control IC or the boost constant current control IC can be guaranteed. Is working.
  • the LED constant current circuit provided by the invention can realize the whole lamp without flicker when being powered by the electronic transformer, and can be compatible with various electronic transformers.
  • 1 is a schematic structural view of a conventional LED buck constant current driving circuit according to the background art of the present invention
  • 2 is a schematic structural diagram of an LED boost constant current driving circuit with more applications as described in the background art of the present invention
  • FIG. 3 is a schematic structural view of an LED driving circuit according to the background art of the present invention
  • FIG. 4 is a schematic structural view of an LED constant current circuit according to Embodiment 1 of the present invention
  • FIG. 5 is a diagram showing a constant current of the LED according to Embodiment 2 of the present invention; Schematic diagram of the structure of the circuit. detailed description
  • the LED constant current circuit includes a bridge rectifier circuit 40, a sampling circuit 46 and a step-down constant current circuit 48, and specifically includes: a first capacitor C1; and a low voltage at the first capacitor C1 a first charging circuit 42 for charging the first capacitor C1 when the output voltage of the bridge rectifier circuit 40 is received, the first charging circuit 42 is respectively connected to the bridge rectifier circuit 40 and the first capacitor a second charging circuit 44 for charging the first capacitor C1 when the output voltage of the bridge rectifier circuit 40 is higher than the voltage of the first capacitor C1, the second charging circuit 44 respectively
  • the bridge rectifier circuit 40 is connected to the first capacitor C1.
  • the first charging circuit 42 and the second charging circuit 44 are respectively used to charge the first capacitor C1.
  • the structure adopting the dual channel charging avoids triggering the electronic transformer overcurrent protection at the moment of power-on. Greatly improve the reliability of the circuit.
  • the boost control IC or the boost constant current control IC is always in operation when the input voltage is low.
  • FIG. 5 is a schematic structural view of an LED constant current circuit according to Embodiment 2 of the present invention. Referring to Fig. 5, Fig. 5 shows a preferred circuit configuration of the first charging circuit 42 and the second charging circuit 44.
  • the first charging circuit 42 may specifically include: a second capacitor C2, the first end of the second capacitor C2 is connected to the bridge rectifier circuit 40, that is, DB in FIG. 5; the first resistor R1, the first a first end of the resistor R1 is connected to the second end of the second capacitor C2, The second end of the first resistor R1 is connected to the anode of the first capacitor CI.
  • the above is the priority circuit configuration of the first charging circuit 42, but the configuration of the first charging circuit 42 is not limited thereto, and any of the first capacitors C1 can be used when the voltage of the first capacitor C1 is lower than the output voltage of the bridge rectifier circuit 40.
  • the circuits for charging are all within the scope of the present invention.
  • the second charging circuit 44 may specifically include: an inductor L1, the first end of the inductor L1 is connected to the bridge rectifier circuit 40, that is, DB in FIG. 5; the diode D1, the first end of the diode D1 is connected a second end of the first inductor L1, a second end of the diode D1 is connected to the positive electrode C1 of the first capacitor; a boost control chip IC, a first end of the boost control chip IC is connected to the positive electrode of the first capacitor C1 The second end of the boost control chip IC is connected to the negative pole of the first capacitor C1; the MOSFET Q1, the source of the MOS transistor Q1 is connected to the second end of the inductor L1, and the gate of the MOS transistor Q1 is connected to the rise The third end of the voltage control chip IC, the drain of the MOS transistor Q1 is connected to the cathode of the first capacitor C1.
  • the above is the priority circuit configuration of the second charging circuit 44, but the configuration of the second charging circuit 44 is not limited thereto, and any when the output voltage of the bridge rectifier circuit 40 is higher than the voltage of the first capacitor C1
  • the circuit for charging the first capacitor C1 is within the protection scope of the present invention.
  • the sampling circuit 46 includes: a second resistor R2, a first end of the second resistor R2 is connected to the anode of the first capacitor C1; and a third resistor R3 is connected to the first end of the third resistor R3.
  • the second end of the second resistor R2, the second end of the third resistor R3 is connected to the cathode of the first capacitor C1.
  • the first end of the step-down constant current circuit 48 is connected to the third resistor R3, and the second end of the step-down constant current circuit 48 is connected to the second resistor R2 through a target LED lamp.
  • the overcurrent protection of the electronic transformer is triggered at the moment of power-on, which greatly improves the reliability of the circuit.
  • the first capacitor is supplied through two channels. Since the capacitor voltage cannot be abruptly changed, the inductor current cannot be abruptly changed, so the two sets of currents charged for the first capacitor have a phase difference, and the first capacitor has two The voltage at the terminal is also more stable.
  • the change control IC outputs power from the booster circuit, since the voltage across the first capacitor can always be higher than the startup voltage of the control IC, even if the input The lower voltage also ensures that the boost control IC or boost constant current control IC is always active.
  • the LED constant current circuit can realize the whole lamp without flicker when being powered by the electronic transformer, and can be compatible with various electronic transformers.
  • the present invention provides an LED lamp comprising the above-described LED constant current circuit.
  • the LED luminaire further includes an electronic transformer, and the electronic transformer is connected to the LED constant current circuit through a bridge rectifier circuit of the LED luminaire.
  • the LED lamp of the invention avoids the over-power protection of the electronic transformer by removing the filter capacitor after the bridge rectifier circuit DB, and realizes stable power supply of the LED lamp.

Landscapes

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

Abstract

L'invention porte sur un circuit à courant constant de DEL et sur une lampe à DEL, qui sont utilisés pour améliorer la stabilité d'un circuit lorsqu'un transformateur électronique fournit de l'énergie. Le circuit à courant constant de DEL comprend un circuit redresseur en pont (DB), un circuit d'échantillonnage (46) et un circuit à courant constant abaisseur de tension (2), et comprend en outre : un premier condensateur (C1), un premier circuit de charge (42) utilisé pour charger le premier condensateur (C1) lorsque la tension du premier condensateur (C1) est inférieure à la tension de sortie du circuit redresseur en pont (DB), le premier circuit de charge (42) étant connecté au circuit redresseur en pont (DB) et au premier condensateur (C1), respectivement ; et un second circuit de charge (44) utilisé pour charger le premier condensateur (C1) lorsque la tension de sortie du circuit redresseur en pont (DB) est supérieure à la tension du premier condensateur (C1), le second circuit de charge (44) étant connecté au circuit redresseur en pont (DB) et au premier condensateur (C1), respectivement. La lampe à DEL comprend un circuit à courant constant de DEL, empêche la protection contre une surintensité d'un transformateur électronique déclenchée au moment d'un allumage, et améliore la fiabilité d'un circuit, de telle sorte que la lampe globale n'a pas de scintillement lorsque le transformateur électronique fournit de l'énergie
PCT/CN2013/082026 2013-08-22 2013-08-22 Circuit à courant constant de del et lampe à del WO2015024224A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2013/082026 WO2015024224A1 (fr) 2013-08-22 2013-08-22 Circuit à courant constant de del et lampe à del
CN201380057433.4A CN104813745B (zh) 2013-08-22 2013-08-22 Led恒流电路及led灯具

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2013/082026 WO2015024224A1 (fr) 2013-08-22 2013-08-22 Circuit à courant constant de del et lampe à del

Publications (1)

Publication Number Publication Date
WO2015024224A1 true WO2015024224A1 (fr) 2015-02-26

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Application Number Title Priority Date Filing Date
PCT/CN2013/082026 WO2015024224A1 (fr) 2013-08-22 2013-08-22 Circuit à courant constant de del et lampe à del

Country Status (2)

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CN (1) CN104813745B (fr)
WO (1) WO2015024224A1 (fr)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050237005A1 (en) * 2004-04-23 2005-10-27 Lighting Science Group Corporation Electronic light generating element light bulb
JP2005327607A (ja) * 2004-05-14 2005-11-24 Matsushita Electric Works Ltd 位相制御式調光システム
CN101861018A (zh) * 2010-05-05 2010-10-13 金杲易光电科技(深圳)有限公司 可调光的led开关电源
CN202085375U (zh) * 2011-06-23 2011-12-21 李竹 可调输出电流的led恒流开关电源
CN202177974U (zh) * 2011-08-19 2012-03-28 中国长城计算机深圳股份有限公司 一种led交通信号灯及其驱动电路
CN102404908A (zh) * 2010-09-08 2012-04-04 惠州元晖光电有限公司 用于电子变压器驱动led器件的稳定网络
JP2012094424A (ja) * 2010-10-28 2012-05-17 Mitsubishi Electric Corp 点灯装置ならびにこの点灯装置を備える照明器具
CN102469668A (zh) * 2011-05-04 2012-05-23 深圳市金流明光电技术有限公司 匹配电子变压器的led电源电路
CN102711339A (zh) * 2012-06-21 2012-10-03 深圳市耀星光电子有限公司 Led驱动电路
CN202663613U (zh) * 2012-06-19 2013-01-09 深圳市九洲光电科技有限公司 用于led mr16射灯的驱动电路

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202565539U (zh) * 2012-05-09 2012-11-28 芯巧科技股份有限公司 发光二极管的升压驱动电路

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050237005A1 (en) * 2004-04-23 2005-10-27 Lighting Science Group Corporation Electronic light generating element light bulb
JP2005327607A (ja) * 2004-05-14 2005-11-24 Matsushita Electric Works Ltd 位相制御式調光システム
CN101861018A (zh) * 2010-05-05 2010-10-13 金杲易光电科技(深圳)有限公司 可调光的led开关电源
CN102404908A (zh) * 2010-09-08 2012-04-04 惠州元晖光电有限公司 用于电子变压器驱动led器件的稳定网络
JP2012094424A (ja) * 2010-10-28 2012-05-17 Mitsubishi Electric Corp 点灯装置ならびにこの点灯装置を備える照明器具
CN102469668A (zh) * 2011-05-04 2012-05-23 深圳市金流明光电技术有限公司 匹配电子变压器的led电源电路
CN202085375U (zh) * 2011-06-23 2011-12-21 李竹 可调输出电流的led恒流开关电源
CN202177974U (zh) * 2011-08-19 2012-03-28 中国长城计算机深圳股份有限公司 一种led交通信号灯及其驱动电路
CN202663613U (zh) * 2012-06-19 2013-01-09 深圳市九洲光电科技有限公司 用于led mr16射灯的驱动电路
CN102711339A (zh) * 2012-06-21 2012-10-03 深圳市耀星光电子有限公司 Led驱动电路

Also Published As

Publication number Publication date
CN104813745A (zh) 2015-07-29
CN104813745B (zh) 2016-07-06

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