WO2018223247A1 - Diode électroluminescente - Google Patents

Diode électroluminescente Download PDF

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Publication number
WO2018223247A1
WO2018223247A1 PCT/CN2017/000383 CN2017000383W WO2018223247A1 WO 2018223247 A1 WO2018223247 A1 WO 2018223247A1 CN 2017000383 W CN2017000383 W CN 2017000383W WO 2018223247 A1 WO2018223247 A1 WO 2018223247A1
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WO
WIPO (PCT)
Prior art keywords
voltage
power
led
module
emitting diode
Prior art date
Application number
PCT/CN2017/000383
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English (en)
Chinese (zh)
Inventor
吕光辉
Original Assignee
吕光辉
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 吕光辉 filed Critical 吕光辉
Priority to PCT/CN2017/000383 priority Critical patent/WO2018223247A1/fr
Publication of WO2018223247A1 publication Critical patent/WO2018223247A1/fr

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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
    • 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 an apparatus for a Light-Emitting Diode (LED) driver.
  • LED Light-Emitting Diode
  • a LED driver is a device that adjusts the power to an LED or multiple LEDs.
  • LED drivers can be responsive to the needs of LEDs or LED circuits by providing a fixed amount of power to the LEDs as their electronic characteristics change with temperature.
  • the LED driver is an independent power supply that has an output corresponding to the electronic characteristics of the LED.
  • the LED driver can provide dimming by means of a pulse width modulation circuit and can have more than one channel for separate control of different LEDs or LED arrays.
  • the LED power level is fixedly maintained by the LED driver by an increase in temperature and a decrease in electronic characteristics of the LED driver as viewed by the LED or LEDs. Therefore, without a suitable driver or system, the LEDs may overheat or become unstable, thereby performing poorly or failing.
  • the existing LED driver rectifies an alternating current (AC) full-wave waveform into an AC half-wave waveform through a bridge integrated circuit (IC) before providing the required power to the LED.
  • AC alternating current
  • IC bridge integrated circuit
  • MOS Metal Oxide Semiconductor
  • the problem of power loss is based on a power supply that uses an AC half-wave waveform.
  • the starting voltage of the LED is a direct current (DC) power supply, power loss occurs.
  • An aspect of the invention relates to a system for providing a starting voltage to a light emitting diode unit, the system comprising: a bridge module for rectifying an alternating current full wave waveform from a power source into an alternating current half a waveform circuit module having a metal oxide semiconductor, the step-down circuit module for rectifying the AC half-wave waveform into a DC power supply for the LED unit, wherein the step-down circuit The module uses a power factor adjustment module to perform power factor correction and uses a flow control LED to control the wafer to rectify a full voltage so that the DC power source corresponds to the startup voltage of the LED unit Receiving the full voltage to be supplied to the light emitting diode unit.
  • the bridge module is a bridge circuit.
  • the light emitting diode unit is a light emitting diode driver having an integrated circuit.
  • the light emitting diode unit has a current limit set by a metal oxide semiconductor power transistor
  • the voltage of the system is adjusted to be adjacent to the voltage of the buck circuit module to overcome an input voltage difference.
  • a full range buck output voltage of a constant current illuminating diode between 85 Vac to 305 Vac is used for the luminescent diode unit.
  • the system includes an active power factor correction circuit to achieve high power factor values with low total harmonic distortion.
  • the system operates in a continuous power inductor critical mode and a metal oxide transistor operates in a zero power switching mode to reduce switching losses and increase inductor usage.
  • the system includes a cycle-by-cycle current limiting protection feature to protect a metal oxide transistor, inductor, and freewheeling diode to improve system reliability.
  • the system includes a floating ground wafer to isolate interference and prevent zero voltage and zero crossing effects to protect a metal oxide transistor, freewheeling diode, and the modules in the system.
  • Figure 1 shows a flow diagram of a modified circuit design and structure using a DC voltage mode to provide LEDs.
  • Figure 2 shows a block diagram of a modified circuit design and structure using a DC voltage mode to provide LEDs.
  • the present invention proposes a modified circuit design and structure that uses a DC voltage mode to provide a better power supply for the LED, which better improves power usage efficiency and full voltage (85Vac to 305Vac) input to overcome existing linear LEDs Design flaws in the driver IC.
  • Full voltage means that the incoming voltage is the actual voltage in the bulb, but when a resistor is used, for example, the incoming voltage is reduced and the actual voltage in the bulb is about 12V.
  • the full-voltage LED driver rectifies the AC full-wave waveform into an AC half-wave waveform via a bridge IC, and the system can use a step-down voltage circuit module that is implemented by MOS, pole, or electrical fusion.
  • the AC power source 101 is rectified into a DC power source for use as an LED.
  • the LED current limit is set by the MOS power transistor or step-down voltage setting module 103 because such a design overcomes the initial design flaws faced by conventional circuits.
  • the proposed system since the proposed system has a DC power supply corresponding to the LED unit 106 having a starting voltage using a DC power source, the efficiency of power use can be greatly improved.
  • the power usage improvement can be achieved by using the voltage sensing circuit module 104 to sense the voltage of the circuit; and using the buck voltage regulating module 105 to maintain a regulated voltage while maintaining a fixed output voltage and continuously The difference between the output and the regulated voltage is dissipated as waste heat.
  • Such circuits provide output voltage performance from less than 2V to greater than 100V, switching frequencies as large as 4MHz, and high efficiency operation up to 96%.
  • JF1606 is a high precision step-down LED constant current control wafer that is a step-down voltage circuit module 102 that includes a power factor adjustment module 110 for power factor adjustment.
  • the LED constant current control chip is suitable for a full range of buck input voltages with fixed current LEDs from 85Vac to 305Vac.
  • the system integrates active power factor correction circuitry to achieve high power factor and low total harmonic distortion. Since the MOS power transistor is in zero power switching mode due to operation in the continuous power inductor critical mode, switching losses are reduced and higher inductor usage is achieved. This improvement in power factor is achieved by adding a power factor correction capacitor to the distribution system. When apparent power (kVA) is greater than work Power (kW), the device must provide this excess reactive current plus the operating current.
  • the power capacitor acts as an inactive current generator.
  • the constant current controller (stable current, time independent current, fixed current) is a type of DC controller whose strength does not change with time. If the load is fixed, a steady current can be obtained by a fixed voltage source. If the load is variable, a steady current can be obtained by a fixed current supply.
  • the system has multiple protection functions to enhance system reliability, including: LED circuit protection module 111 for LED open circuit protection and / or LED short circuit protection; IC under voltage protection module 112 for protection with power supply under voltage IC or wafer; current sampling protection module 114 for protecting current sampling resistors on an open circuit; cycle-by-cycle power limiting module 116 to effectively protect the MOS field effect transistor, and allowing a current regulator or precision Simple configuration of current limit, etc. All protection modes have an automatic restart function.
  • the system also has a wafer thermal regulation protection 113 for reducing the output current when the drive power source is overheated to improve the reliability of the system.
  • the LED module includes: an LED power setting module 107 to determine the power applied by the LED unit 106; a power sensing circuit 108 to sense the power of the LED circuit; and an LED power adjuster 109 to maintain the pair of LED units A stable voltage of 106.
  • the proposed system for an LED driver is referred to as JF1606, and its block diagram is shown in Figure 2, which is an active power factor corrected LED constant current control wafer.
  • the system operates in a continuous power inductor critical mode, thus achieving extremely high power factor, extremely low total harmonic distortion and high efficiency.
  • the method of using the device as an LED driver includes the following steps.
  • the bus voltage is charged to the capacitor of the IC power supply pin (VCC) through the startup resistor.
  • VCC IC power supply pin
  • the device or system begins to output a pulse signal, and the Vref voltage gradually rises from 1.5V, and the peak current of the inductor rises accordingly, thereby achieving a soft start of the output LED current, effectively preventing the output current from overshooting.
  • the VCC voltage is supplied from the output voltage through the diode, thereby reducing power consumption.
  • the device or system then samples the inductor current cycle by cycle and operates in a continuous power inductor critical mode to achieve high precision output current control.
  • the LED output current calculation method is:
  • Vref is the internal reference reference voltage and Rcs is the current sampling resistance value
  • the device or system detects the state of the output voltage through a feedback network.
  • the buck threshold voltage of the feedback network is set at 0.2V and the hysteresis voltage is set to 0.15V.
  • the feedback network pin can also be used to detect Over Voltage Protection (OVP) with a threshold of 1.6V.
  • OVP Over Voltage Protection
  • the ratio of the upper and lower voltage divider resistors of the feedback network can be set to:
  • Rfbl is the lower divider resistor of the feedback network
  • Rfbh is the upper divider resistor of the feedback network
  • Vovp is the set point of the overvoltage protection
  • the divider resistor under the feedback network is recommended to be set at 5K ⁇ to 10K ⁇ . about.
  • the device or system is then connected to a thermal energy adjustment function.
  • the output current is gradually reduced, thereby controlling and maintaining the output power and temperature at a set value to improve the reliability of the system.
  • the thermal control point inside the wafer is set to 150 degrees Celsius.
  • the device or system is equipped with multiple built-in protection features to ensure system reliability.
  • the LED When the LED is open, the output voltage gradually rises, and the feedback network pin can detect the output voltage when the power transistor is turned off.
  • the protection logic When the feedback network rises to the OVP protection threshold, the protection logic is triggered and the switch is stopped.
  • the LED When the LED is short-circuited, since the output voltage is very low, VCC cannot be supplied through the diode, so the VCC voltage will gradually drop until VCC reaches the undervoltage protection threshold.
  • the system enters protection mode, the VCC voltage begins to drop, and when VCC reaches the undervoltage protection threshold, the system will restart. The system will continue the test and, once the fault is removed, the system will resume normal operation.
  • all isolated buck lines contain one or several transformers. By adjusting the turns ratio of the transformer, a higher or lower or negative potential output voltage can be obtained. In some isolated buck line configurations, multiple windings can be wound around the transformer to output multiple voltage values. Some converters also use transformers as energy storage devices, but other converters still require separate inductive devices. This type of power conversion mode is a "DC-AC-DC" conversion. However, this can be an expensive way.
  • the non-isolated power supply is the simplest power switch mode, and its power conversion mode is "DC-DC" conversion.
  • Boost Chopper also known as Boost Converter
  • Buck Chopper also known as buck
  • Buck-Boost Chopper also known as Buck-Boost Converter
  • Their structures are very similar, and the input, output, and grounding all meet at one point, using inductors for energy storage. The main difference between them is the way the inductor is connected. If the inductor is placed at the output of the circuit, it is a step-down chopper; when the inductor is placed at the input of the circuit, it is a boost chopper. When the inductor is grounded, it is a buck-boost chopper.
  • the full-voltage step-down LED constant current control chip receives the bridge half-wave waveform power, rectifies it into a DC power supply, and after LC filtering, supplies the power to the LED.
  • the LC circuit also referred to as a resonant circuit, a tank circuit, a tuning circuit
  • the LC circuit is an inductor (represented by the letter L) and a capacitor (represented by the letter C) connected to each other.
  • the full-voltage step-down LED constant current control chip is designed for ground landing, which uses a diode connection to control the floating ground of the wafer and the ground of the bridge IC, thereby isolating interference between the two parts and preventing The effect of zero voltage and zero crossing to protect the life of parts such as power MOS transistors and freewheeling diodes.

Landscapes

  • Dc-Dc Converters (AREA)

Abstract

L'invention concerne un système destiné à fournir une tension de démarrage à une unité diode électroluminescente (DEL). Le système comprend : un module en pont, servant à redresser une forme d'onde pleine onde de CA provenant d'une source d'alimentation (101) en une forme d'onde demi-onde de CA; et un module de circuit abaisseur de tension (102) comportant un semi-conducteur à oxyde métallique, le module de circuit abaisseur de tension (102) servant à redresser la forme d'onde demi-onde de CA en une alimentation électrique de CC destinée à l'unité DEL (106). Le module de circuit abaisseur de tension (102) corrige un facteur de puissance par le biais d'un module de correction de facteur de puissance (110), et redresse une tension nominale à l'aide d'une puce de commande de DEL de commande de courant constant, de sorte que la source d'alimentation CC (101) puisse recevoir la tension nominale appliquée à l'unité DEL (106) d'une manière correspondant à la tension de démarrage de l'unité DEL (106).
PCT/CN2017/000383 2017-06-09 2017-06-09 Diode électroluminescente WO2018223247A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2017/000383 WO2018223247A1 (fr) 2017-06-09 2017-06-09 Diode électroluminescente

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2017/000383 WO2018223247A1 (fr) 2017-06-09 2017-06-09 Diode électroluminescente

Publications (1)

Publication Number Publication Date
WO2018223247A1 true WO2018223247A1 (fr) 2018-12-13

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PCT/CN2017/000383 WO2018223247A1 (fr) 2017-06-09 2017-06-09 Diode électroluminescente

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WO (1) WO2018223247A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201846506U (zh) * 2010-10-09 2011-05-25 大连森谷新能源电力技术有限公司 高效恒流源驱动的led电路
CN103037576A (zh) * 2012-11-29 2013-04-10 余姚亿威电子科技有限公司 一种led恒流驱动电源电路
CN104717787A (zh) * 2013-12-17 2015-06-17 西安信唯信息科技有限公司 一种小体积led电源
CN105578656A (zh) * 2016-01-27 2016-05-11 张家港麦智电子科技有限公司 一种120-347vac宽输入电压范围的led恒流驱动电源
JP6038190B2 (ja) * 2013-01-29 2016-12-07 三菱電機株式会社 電力変換装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201846506U (zh) * 2010-10-09 2011-05-25 大连森谷新能源电力技术有限公司 高效恒流源驱动的led电路
CN103037576A (zh) * 2012-11-29 2013-04-10 余姚亿威电子科技有限公司 一种led恒流驱动电源电路
JP6038190B2 (ja) * 2013-01-29 2016-12-07 三菱電機株式会社 電力変換装置
CN104717787A (zh) * 2013-12-17 2015-06-17 西安信唯信息科技有限公司 一种小体积led电源
CN105578656A (zh) * 2016-01-27 2016-05-11 张家港麦智电子科技有限公司 一种120-347vac宽输入电压范围的led恒流驱动电源

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