CN107018594B - LED load protection method - Google Patents

LED load protection method Download PDF

Info

Publication number
CN107018594B
CN107018594B CN201710225503.2A CN201710225503A CN107018594B CN 107018594 B CN107018594 B CN 107018594B CN 201710225503 A CN201710225503 A CN 201710225503A CN 107018594 B CN107018594 B CN 107018594B
Authority
CN
China
Prior art keywords
load
led
current
working mode
protection method
Prior art date
Application number
CN201710225503.2A
Other languages
Chinese (zh)
Other versions
CN107018594A (en
Inventor
杨超
邹高迪
Original Assignee
深圳迈睿智能科技有限公司
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 深圳迈睿智能科技有限公司 filed Critical 深圳迈睿智能科技有限公司
Priority to CN201710225503.2A priority Critical patent/CN107018594B/en
Publication of CN107018594A publication Critical patent/CN107018594A/en
Application granted granted Critical
Publication of CN107018594B publication Critical patent/CN107018594B/en

Links

Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR
    • H05B45/00Circuit arrangements for operating light emitting diodes [LED]
    • H05B45/50Circuit arrangements for operating light emitting diodes [LED] responsive to malfunctions of LEDs; responsive to LED life; Protective circuits
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00Energy efficient lighting technologies
    • Y02B20/30Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
    • Y02B20/34Inorganic LEDs
    • Y02B20/341Specially adapted circuits

Abstract

The invention provides an LED load protection method, which is characterized in that a load state detection circuit is added in a load loop, and an LED driving power supply at least comprises two working modes, namely a normal load working mode and a no-load working mode; the load state detection circuit monitors the connection state of the load, and when the load state detection circuit detects that the load is in an idle state, the load state detection circuit controls the LED driving power supply to be switched to a no-load state working mode within 10 ms; when the load state detection circuit detects that the load is normally connected, the delay time is 5-100 ms to control the LED driving power supply to be switched to a normal load working mode. The LED load protection circuit can enter a low-current mode at the moment of disconnection of the LED load, and enter a normal working mode after the LED load is stably connected, particularly enter the low-current mode within 1 millisecond after the LED load is disconnected, and can effectively protect the LED from being damaged by overhigh junction temperature caused by poor contact or high current impact at the moment of connection.

Description

LED load protection method

Technical Field

The invention relates to the technical field of LED lighting, in particular to an LED load protection method.

Background

Due to the good lighting effect, the long service life and the excellent environmental protection characteristic of the LED lamp, the LED lamp gradually replaces the traditional incandescent lamp and the ordinary bulb in many application occasions, so the popularization of the LED lamp is more and more extensive, and with the increase of the popularization rate of the LED lamp, various problems of the LED lamp are gradually exposed. The damage of the abnormal service life of the LED is an important problem to be solved. Analysis finds that when the LED load and the output end of the LED power supply are in a poor contact state, the poor contact is that the LED load is frequently switched on and off, and the LED is damaged due to overhigh junction temperature caused by the high-current impact existing at the moment of contact of the LED, so that the damage of the LED lamp is an important reason.

Disclosure of Invention

Aiming at the defects, the invention aims to prevent the LED lamp from being impacted by a large instantaneous circuit and prolong the service life of the LED lamp.

In order to solve the above problems, the present invention provides a method for protecting an LED load, which is characterized in that a load state detection circuit is added in a load loop, and an LED driving power supply at least includes two operating modes, namely a normal load operating mode and a no-load operating mode; the load state detection circuit monitors the connection state of the load, and controls the LED driving power supply to be switched to a no-load state working mode within 10ms when the load state detection circuit detects that the load is in a no-load state; when the load state detection circuit detects that the load is normally connected, the time delay is 1-200 ms to control the LED driving power supply to be switched to a normal load working mode.

The LED load protection method is characterized in that the load state detection circuit controls the LED driving power supply to be switched to a no-load state working mode within 10ms when monitoring that the load is in a no-load state.

The LED load protection method is characterized in that the no-load state working mode is divided into a no-load low-current working mode, a no-load no-output-voltage working mode or a no-load low-output-voltage working mode.

The LED load protection method is characterized in that a current control circuit, a no-load processing circuit, an AC/DC conversion circuit and a BUCK circuit are additionally arranged in a load loop, and the AC/DC conversion circuit is used for converting high voltage into low-voltage direct current; the BUCK circuit is used for converting low-voltage direct current into LED power supply voltage for the voltage reduction change circuit; the load state detection circuit outputs the detected result of the load state to the no-load processing circuit, and the no-load processing circuit controls the current control circuit according to the input result of the load state and controls the LED driving power supply to enter a no-load state working mode or a normal load working mode.

The LED load protection method is characterized in that when the load state detection circuit detects that the load can be normally and reliably accessed, the holding time for detecting the normal and reliable access of the load is increased, and when the detected holding time exceeds a preset holding threshold value, the LED driving power supply is controlled to be switched to a normal load working mode.

The LED load protection method is characterized in that the keeping threshold value is the circuit stable time for the LED load to be normally and reliably accessed, and is 1-200 ms.

The LED load protection method is characterized in that the current control circuit comprises a current limiting module and a current conversion module, the no-load processing circuit is an MCU controller, and the current limiting module is connected with the control end of the MCU controller to realize the control of the output current and the output voltage of the rear stage.

The LED load protection method is characterized in that two working modes, namely a normal load working mode and a no-load working mode of the LED driving power supply are realized by controlling the current limiting module to be connected with a load loop in series or bypass; specifically, the current limiting module is connected with a load loop in series and corresponds to a no-load working mode; the current limiting module and the load loop bypass correspond to a normal load working mode.

The LED load protection method is characterized in that the load state detection circuit comprises a current detection module and a current comparison module, the current detection module is connected with a load in series, the current detection module is connected with the current comparison module in parallel, and the output end of the current comparison module is connected with the input port of the MCU controller.

The LED load protection method is characterized in that the current control circuit is realized by controlling the primary or secondary power output control end

The LED load protection device can enter a no-load state working mode at the moment of disconnection of the LED load, prepares for no generation of large instant large current when the next LED load is connected online, and enters a normal working mode after the LED load is stably connected, particularly enters the no-load state working mode within 1 millisecond after the LED load is disconnected, so that the LED can be effectively protected from being damaged by overhigh junction temperature due to poor contact or high current impact at the moment of connection.

Drawings

Fig. 1 is a block diagram of an LED driving power supply system implementing an LED load protection method.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 is a block diagram of an LED driving power supply system implementing an LED load protection method. The LED driving power supply system comprises an AC/DC conversion circuit 1, a BUCK circuit 2, a load state detection circuit 3, a current control circuit 4 and a no-load processing circuit 6; the AC/DC conversion circuit 1 converts high-voltage alternating current into low-voltage direct current, the BUCK circuit 2 converts the low-voltage direct current into voltage required by an LED for the voltage reduction conversion circuit, and meanwhile, the voltage reduction conversion circuit plays a role in constant voltage and constant current, the load state detection circuit 3 detects whether a load 5 is correctly connected, and the load 5 is an LED lamp. The current control circuit 4 is switched to a no-load operation mode and a normal load operation mode through the no-load processing circuit 6 under the action of the load state detection circuit 3. When the load 5 is normally connected, the load state detection circuit 3 detects that the load mode is normally connected, and the no-load processing circuit 6 controls the current control circuit 4 to work in the normal load working mode according to the detection result of the load state detection circuit 3; when the load 5 is abnormally connected, the load is in poor contact with the output end, the load state detection circuit 3 detects that the load mode is abnormally connected, and the no-load processing circuit 6 controls the current control circuit 4 to work in the no-load low-current working mode according to the detection result of the load state detection circuit 3, so that the LED is protected from being damaged. It is therefore desirable to switch the operating mode from the normal load operating mode to the no load operating mode in as short a time as possible when the load is detected as the no load mode.

Particularly for the situation that the load contact failure may exist, it is preferable that when the load state detection circuit detects that the load is normally connected, the holding time for detecting that the load is normally connected is increased, and when the detected holding time exceeds a preset holding threshold, the LED driving power supply is controlled to switch to the normal load operation mode. Therefore, the LED can be ensured to be in poor contact, particularly to be frequently impacted by large current in a shaking state, and the working mode is switched from a no-load working mode to a normal load working mode after the LED is positively wrapped and stably contacted with the load.

While the invention has been described with reference to a particular embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. A LED load protection method is characterized in that a load state detection circuit is added in a load loop,
the LED driving power supply at least comprises a normal load working mode and a no-load working mode; the load state detection circuit monitors the connection state of the load, and controls the LED driving power supply to be switched to a no-load state working mode within 10ms when the load state detection circuit detects that the load is in a no-load state; when the load state detection circuit detects that the load is normally connected, the time delay is 1-200 ms to control the LED driving power supply to be switched to a normal load working mode.
2. The LED load protection method according to claim 1, wherein the load state detection circuit controls the LED driving power supply to switch to the no-load state operation mode within 10ms when monitoring that the load is in the no-load state.
3. The LED load protection method according to claim 2, wherein the no-load state operation mode is classified as a no-load low-current operation mode, a no-load no-output-voltage operation mode, or a no-load low-output-voltage operation mode.
4. The LED load protection method according to any one of claims 1 to 3, characterized in that a current control circuit, a no-load processing circuit, an AC/DC conversion circuit and a BUCK circuit are further added in the load loop, wherein the AC/DC conversion circuit realizes conversion of high voltage into low voltage direct current; the BUCK circuit is used for converting low-voltage direct current into LED power supply voltage for the voltage reduction change circuit; the load state detection circuit outputs the detected result of the load state to the no-load processing circuit, and the no-load processing circuit controls the current control circuit according to the input result of the load state and controls the LED driving power supply to enter a no-load state working mode or a normal load working mode.
5. The LED load protection method according to claim 4, wherein when the load state detection circuit detects that the load is normally and reliably connected, the holding time for detecting that the load is normally and reliably connected is increased, and when the detected holding time exceeds a preset holding threshold, the LED driving power supply is controlled to switch to the normal load operation mode.
6. The LED load protection method according to claim 5, wherein the holding threshold is a circuit stable time for normal and reliable access of the LED load, and the holding threshold is 1-200 ms.
7. The LED load protection method according to claim 6, wherein the current control circuit comprises a current limiting module and a current converting module, the no-load processing circuit is an MCU controller, and the current limiting module is connected to a control terminal of the MCU controller to control the output current and the output voltage of the rear stage.
8. The LED load protection method according to claim 7, wherein two working modes of a normal load working mode and a no-load working mode of the LED driving power supply are realized by controlling the current limiting module to be connected with the load loop in series or bypass; specifically, the current limiting module is connected with a load loop in series and corresponds to a no-load working mode; the current limiting module and the load loop bypass correspond to a normal load working mode.
9. The LED load protection method according to claim 7, wherein the load state detection circuit comprises a current detection module and a current comparison module, the current detection module is connected in series with the load, the current detection module is connected in parallel with the current comparison module, and an output end of the current comparison module is connected with an input port of the MCU controller.
10. The LED load protection method according to claim 6, wherein the current control circuit is implemented by controlling a power output control terminal of the primary or secondary.
CN201710225503.2A 2017-04-07 2017-04-07 LED load protection method CN107018594B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201710225503.2A CN107018594B (en) 2017-04-07 2017-04-07 LED load protection method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201710225503.2A CN107018594B (en) 2017-04-07 2017-04-07 LED load protection method
PCT/CN2017/092275 WO2018184311A1 (en) 2017-04-07 2017-07-07 Led load protection method

Publications (2)

Publication Number Publication Date
CN107018594A CN107018594A (en) 2017-08-04
CN107018594B true CN107018594B (en) 2020-02-14

Family

ID=59446138

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201710225503.2A CN107018594B (en) 2017-04-07 2017-04-07 LED load protection method

Country Status (2)

Country Link
CN (1) CN107018594B (en)
WO (1) WO2018184311A1 (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010023817A1 (en) * 2008-08-29 2010-03-04 シャープ株式会社 Power supply device and lighting device
CN103401422A (en) * 2011-06-30 2013-11-20 成都芯源系统有限公司 Switch power supply as well as idle-load control circuit and control method of switch power supply
CN203340356U (en) * 2012-06-19 2013-12-11 三垦电气株式会社 Led lighting device system
CN103605035A (en) * 2013-12-02 2014-02-26 绍兴光大芯业微电子有限公司 No-load detection circuit structure of self-adaptive switching power supply
CN103826363A (en) * 2014-01-28 2014-05-28 杰华特微电子(杭州)有限公司 Hot-plugging protection circuit for LED illuminating apparatus
CN204634138U (en) * 2015-06-11 2015-09-09 深圳市暗能量电源有限公司 Be applied to the LED control circuit of hot plug
CN104950722A (en) * 2015-06-16 2015-09-30 无锡中星微电子有限公司 Power supply circuit for terminal equipment
CN105680697A (en) * 2014-12-08 2016-06-15 戴洛格半导体公司 Adaptive reference voltage for switching power converters
CN106124842A (en) * 2016-07-04 2016-11-16 芯海科技(深圳)股份有限公司 The small area analysis testing circuit of a kind of portable power source and method

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103427395B (en) * 2012-05-21 2017-03-01 台达电子工业股份有限公司 Open loop protection circuit, open-circuit-protection method and illuminator
CN106439540A (en) * 2015-08-08 2017-02-22 嘉兴山蒲照明电器有限公司 LED fluorescent lamp
CN204904053U (en) * 2015-08-19 2015-12-23 航天长峰朝阳电源有限公司 Automatic load option function module
CN106100342B (en) * 2016-06-22 2018-08-28 成都启臣微电子股份有限公司 A kind of output dynamic load fast-response control circuit and main control chip with the circuit
CN205726574U (en) * 2016-06-22 2016-11-23 赛尔富电子有限公司 A kind of power circuit being applied to LED

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010023817A1 (en) * 2008-08-29 2010-03-04 シャープ株式会社 Power supply device and lighting device
CN103401422A (en) * 2011-06-30 2013-11-20 成都芯源系统有限公司 Switch power supply as well as idle-load control circuit and control method of switch power supply
CN203340356U (en) * 2012-06-19 2013-12-11 三垦电气株式会社 Led lighting device system
CN103605035A (en) * 2013-12-02 2014-02-26 绍兴光大芯业微电子有限公司 No-load detection circuit structure of self-adaptive switching power supply
CN103826363A (en) * 2014-01-28 2014-05-28 杰华特微电子(杭州)有限公司 Hot-plugging protection circuit for LED illuminating apparatus
CN105680697A (en) * 2014-12-08 2016-06-15 戴洛格半导体公司 Adaptive reference voltage for switching power converters
CN204634138U (en) * 2015-06-11 2015-09-09 深圳市暗能量电源有限公司 Be applied to the LED control circuit of hot plug
CN104950722A (en) * 2015-06-16 2015-09-30 无锡中星微电子有限公司 Power supply circuit for terminal equipment
CN106124842A (en) * 2016-07-04 2016-11-16 芯海科技(深圳)股份有限公司 The small area analysis testing circuit of a kind of portable power source and method

Also Published As

Publication number Publication date
WO2018184311A1 (en) 2018-10-11
CN107018594A (en) 2017-08-04

Similar Documents

Publication Publication Date Title
CN101176386B (en) Two-wire dimmer with power supply and load protection circuit in the event of switch failure
US10104737B2 (en) Dimmer control circuit, dimmer control method and lighting device containing the same
DE102011013394B4 (en) Battery for a vehicle and method of operating such a battery
CN104037720A (en) Protection device and protection method for preventing voltage drop of power supply of microcontroller in electronic cigarette
CN101159385B (en) Veneer power source backup method and system
CN101609127B (en) Relay fault detecting circuit
JP5469717B2 (en) Open circuit protection circuit, open circuit protection method and lighting device
CN104037735A (en) Rechargeable power supply protection device and method for electronic cigarettes
CN102132479B (en) Power supply device and lighting device
TWI542122B (en) Power supply system and short circuit and/or bad connection detection method thereof, and power converter thereof
CN100474736C (en) Device for supplying uninterruptible power
CN103545911B (en) A kind of uninterruptible power system of dual input intelligent power supply
CN103096561B (en) Constant current driver of light emitting diode (LED) light source
CN102122839B (en) Electric-dazzling prevention auxiliary power supply in low-voltage alternating current control loop and power supply method thereof
EP2695265B1 (en) Charging device for a high-voltage battery of a motor vehicle, charging assembly and method for operating a charging assembly
CN103795050B (en) High tension protection circuit, high voltage protective method and power supply
CN101237137A (en) Over voltage and under-voltage device
US20080036975A1 (en) Projector and temperature control method used in the projector
TW201320140A (en) Powre supply system with automatic transfer function and method of controlling the same
CN103311894B (en) Supply unit
CN102005777A (en) Control method and control system for photovoltaic grid-connected inverter
KR20080079042A (en) Supply apparatus of an emergency power source
US10411501B2 (en) Power supply device and switch control method therefor
US7843149B2 (en) Light dimming device for compact fluorescent lamp
CN2840439Y (en) DC power supply load short-circuit self-restoring circuit

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
CB03 Change of inventor or designer information

Inventor after: Yang Chao

Inventor after: Zou Gaodi

Inventor before: Yang Chao

Inventor before: Zou Gaodi

Inventor before: Li Xiaozeng

Inventor after: Yang Chao

Inventor after: Zou Gaodi

Inventor before: Yang Chao

Inventor before: Zou Gaodi

Inventor before: Li Xiaozeng

CB03 Change of inventor or designer information
GR01 Patent grant
GR01 Patent grant