CN107018594A - A kind of LED load guard method - Google Patents
A kind of LED load guard method Download PDFInfo
- Publication number
- CN107018594A CN107018594A CN201710225503.2A CN201710225503A CN107018594A CN 107018594 A CN107018594 A CN 107018594A CN 201710225503 A CN201710225503 A CN 201710225503A CN 107018594 A CN107018594 A CN 107018594A
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- Prior art keywords
- load
- led
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- circuit
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Classifications
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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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
-
- 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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
- H05B45/56—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving measures to prevent abnormal temperature of the LEDs
-
- 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]
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention provides a kind of LED load guard method, it is characterised in that increases load condition detection circuit in load circuit, and LED drive power at least includes two kinds of mode of operations of normal load mode of operation and no-load condition mode of operation；The connection status of the load condition detection circuit supervision load, when load condition detects that electric circuit inspection is switched to no-load condition mode of operation to control LED drive power when loading as Light Condition in 10ms；When load condition detects that electric circuit inspection is accessed to load is normal, delay 5~100ms controls LED drive power is switched to normal load mode of operation.The present invention can disconnect moment into low current pattern in LED load; just enter normal mode of operation after the stable access of LED load; particularly LED load enters low current pattern after disconnecting in 1 Millisecond, can be effectively protected LED and not caused junction temperature is too high to damage by loose contact or the impact of access instantaneous large-current.
Description
Technical field
The present invention relates to technical field of LED illumination, more particularly to a kind of LED load guard method.
Background technology
LED lamp is answered due to the effect, longer service life and outstanding environmental protection characteristic of its good illumination more
With all starting progressively to instead of traditional incandescent lamp and common bulb in occasion, therefore the popularization of LED lamp is also increasingly wider, with
The raising of the popularity rate of LED lamp, also begins to progressively expose the various problems of LED lamp.The LED non-normal use life-spans are sent out
Raw damage is the problem of one of them is important to be solved.Analysis finds, when the output of LED load and LED power is in connecing
Touch it is bad in the state of, loose contact namely frequently occur LED load power on/off, there is high current in LED Contacts
Impact and make it that junction temperature is too high and cause LED to damage, be a major reason for causing LED lamp to damage.
The content of the invention
It is real present invention aims at how to prevent risk of the LED lamp by moment big circuit impact for disadvantages described above
Now improve LED lamp service life.
In order to solve problem above, the present invention proposes a kind of LED load guard method, it is characterised in that in load circuit
Middle increase load condition detection circuit, LED drive power at least includes normal load mode of operation and no-load condition Working mould
Two kinds of mode of operations of formula；The connection status of the load condition detection circuit supervision load, when load condition detects electric circuit inspection
No-load condition mode of operation is switched within the 10ms times to control LED drive power when loading as Light Condition；Work as load
When state detection circuit detects load normal access, delay 1~200ms controls LED drive power is switched to normal load work
Operation mode.
Described LED load guard method, it is characterised in that the load condition detects that circuit supervision is unloaded to load
LED drive power is controlled to be switched to no-load condition mode of operation within the 10ms times during state.
Described LED load guard method, it is characterised in that no-load condition mode of operation is divided into non-loaded low current work
It is operation mode, non-loaded without output voltage mode of operation or non-loaded low output voltage mode of operation.
Described LED load guard method, it is characterised in that current control circuit, zero load are also add in load circuit
Process circuit, AC/DC change-over circuits and BUCK circuits are loaded, the AC/DC change-over circuits are realized is converted to low-pressure direct by high pressure
Stream electricity；The BUCK circuits are realized for decompression varying circuit is converted into LED supply voltages by low-voltage DC；Load condition is detected
The result of the load condition of detection is output to unloaded load process circuit by circuit, and zero load load process circuit is according to the negative of input
The output control current control circuit of load state, control LED drive power enters no-load condition mode of operation or normal load
Mode of operation.
Described LED load guard method, it is characterised in that when load condition detects electric circuit inspection to load normal reliable
During access, the retention time of increase detection load normal reliable access, exceed the guarantor pre-set when the retention time detected
Holding threshold values then controls LED drive power to be switched to normal load mode of operation.
Described LED load guard method, it is characterised in that it is that the circuit that LED load normal reliable is accessed is steady to keep threshold values
Fix time, holding threshold values is 1~200ms.
Described LED load guard method, it is characterised in that the current control circuit includes current limiting module and electricity
Modular converter is flowed, the unloaded load process circuit is MCU controllers, the current limiting module and the MCU controllers
Control end is connected, and realizes the output current and output voltage of control rear class.
Described LED load guard method, it is characterised in that the normal load mode of operation of LED drive power and non-loaded
Two kinds of mode of operations of operation pattern limit module by control electric current and connect or bypass realization with load circuit；Specially
Current limiting module is connected with load circuit corresponds to no-load condition mode of operation；Current limiting module is bypassed with load circuit
Correspond to normal load mode of operation.
Described LED load guard method, it is characterised in that the load condition detection circuit includes current detection module
And current comparing module, the current detection module and load in series, the current detection module is in parallel with current comparing module,
The output end of the current comparing module is connected with the input port of MCU controllers.
Described LED load guard method, it is characterised in that current control circuit is by controlling primary or secondary power supply
Output control terminal is realized
The present invention can disconnect moment into no-load condition mode of operation in LED load, be that LED load connects online next time
It is fashionable not produce big instantaneous large-current and prepare, just enter normal mode of operation after the stable access of LED load, particularly
LED load enters no-load condition mode of operation after disconnecting in 1 Millisecond, can be effectively protected LED not by loose contact or
Access instantaneous large-current impact and cause junction temperature is too high to damage.
Brief description of the drawings
Fig. 1 is the LED drive power system block diagram for realizing LED load guard method.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Fig. 1 is the LED drive power system block diagram for realizing LED load guard method.LED drive power system includes AC/
DC change-over circuits 1, BUCK circuits 2, load condition detection circuit 3, current control circuit 4 and unloaded load process circuit 6；AC/
High-voltage alternating is converted into low-voltage DC by DC change-over circuits 1, and BUCK circuits 2 are that low-voltage direct is converted into by step-down conversion circuit
Voltage needed for LED, while playing constant pressure and flow effect, whether the load condition detection detection of circuit 3 load 5 correctly accesses, load 5
For LED lamp.Current control circuit 4 is converted into the presence of load condition detection circuit 3 by zero load load process circuit 6
No-load operation pattern and normal load mode of operation.When loading 5 normally access, load condition detection circuit 3 is detected as just
Often access load model, unloaded to load the testing result that process circuit 6 detects circuit 3 according to load condition, control electric current control
Circuit 4 works in normal load mode of operation；When loading 5 improper access, load and output end loose contact, load condition
Detection circuit 3 is detected as improper access load model, and zero load load process circuit 6 detects the inspection of circuit 3 according to load condition
Result is surveyed, control electric current control circuit 4 works in non-loaded low current mode of operation, and protection LED is without damage.Therefore it is required that inspection
When measuring load for idle mode, it is desirable to be switched to mode of operation from normal load mode of operation within the time as short as possible
No-load operation pattern.
The situation bad particular for there may be load contact, preferably when load condition detects electric circuit inspection to load
During normal access, the retention time that increase detection load is normally accessed, exceed the guarantor pre-set when the retention time detected
Holding threshold values then controls LED drive power to be switched to normal load mode of operation.LED can so be ensured in loose contact, it is special
It is not frequently to be impacted under dither state by high current, wraps after positive LED load is steadily contacted again by mode of operation from without negative
Carry mode of operation and be switched to normal load mode of operation.
Above disclosed is only an embodiment of the present invention, can not limit this interest field with this certainly, this
Field those of ordinary skill is appreciated that to realize all or part of flow of above-described embodiment, and is made according to the claims in the present invention
Equivalent variations, still fall within the scope that is covered of the present invention.
Claims (10)
1. a kind of LED load guard method, it is characterised in that increase load condition detection circuit, LED drivings in load circuit
Power supply at least includes two kinds of mode of operations of normal load mode of operation and no-load condition mode of operation；The load condition detection
The connection status of circuit supervision load, LED driving electricity is controlled when load condition detects that electric circuit inspection is Light Condition to load
Source is switched to no-load condition mode of operation within the 10ms times；When load condition detects electric circuit inspection to the normal access of load
When, delay 1~200ms controls LED drive power is switched to normal load mode of operation.
2. LED load guard method according to claim 1, it is characterised in that the load condition detection circuit supervision is arrived
LED drive power is controlled to be switched to no-load condition mode of operation within the 10ms times when loading as Light Condition.
3. LED load guard method according to claim 2, it is characterised in that no-load condition mode of operation is divided into without negative
Carry low current mode of operation, it is non-loaded without output voltage mode of operation or non-loaded low output voltage mode of operation.
4. the LED load guard method according to Claims 1-4 any one, it is characterised in that in load circuit also
Add current control circuit, unloaded load process circuit, AC/DC change-over circuits and BUCK circuits, the AC/DC change-over circuits
High pressure is converted to low-voltage DC by realization；The BUCK circuits are realized for decompression varying circuit and are converted into low-voltage DC
LED supply voltages；Load condition detects that the result of the load condition of detection is output to unloaded load process circuit by circuit, unloaded
Output control current control circuit of the process circuit according to the load condition of input is loaded, control LED drive power enters without negative
Carry operation pattern or normal load mode of operation.
5. LED load guard method according to claim 4, it is characterised in that when load condition detection electric circuit inspection is to bearing
When carrying normal reliable access, increase the retention time of detection load normal reliable access, exceed in advance when the retention time detected
The holding threshold values first set then controls LED drive power to be switched to normal load mode of operation.
6. LED load guard method according to claim 5, it is characterised in that holding threshold values is LED load normal reliable
The circuit settling times of access, holding threshold values is 1~200ms.
7. LED load guard method according to claim 6, it is characterised in that the current control circuit is limited including electric current
Molding block and current conversion module, the unloaded load process circuit is MCU controllers, the current limiting module with it is described
The control end of MCU controllers is connected, and realizes the output current and output voltage of control rear class.
8. LED load guard method according to claim 7, it is characterised in that the normal load work of LED drive power
Two kinds of mode of operations of pattern and no-load condition mode of operation limit module by control electric current and connected with load circuit or other
Realize on road；Specially current limiting module is connected with load circuit corresponds to no-load condition mode of operation；Current limiting module
Normal load mode of operation is corresponded to load circuit bypass.
9. LED load guard method according to claim 7, it is characterised in that the load condition detection circuit includes electricity
Flow detection module and current comparing module, the current detection module and load in series, the current detection module and electric current ratio
Compared with wired in parallel, the output end of the current comparing module is connected with the input port of MCU controllers.
10. LED load guard method according to claim 6, it is characterised in that current control circuit is primary by controlling
Or secondary power supply output control terminal is realized.
Priority Applications (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 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710225503.2A CN107018594B (en) | 2017-04-07 | 2017-04-07 | LED load protection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107018594A true CN107018594A (en) | 2017-08-04 |
| CN107018594B CN107018594B (en) | 2020-02-14 |
Family
ID=59446138
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710225503.2A Active 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) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108465545A (en) * | 2018-05-07 | 2018-08-31 | 浙江帅康电气股份有限公司 | The garbage pulverator of work functions is automatically stopped with zero load |
| CN112637991A (en) * | 2019-09-20 | 2021-04-09 | 台达电子工业股份有限公司 | Power supply applied to light emitting diode and operation method thereof |
| CN113692092A (en) * | 2021-08-19 | 2021-11-23 | 江苏达伦电子股份有限公司 | Control system capable of reducing energy consumption of intelligent projection ceiling lamp |
| CN114024446A (en) * | 2022-01-07 | 2022-02-08 | 深圳市永联科技股份有限公司 | Switching module, voltage stabilization control method and related device |
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| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108465545A (en) * | 2018-05-07 | 2018-08-31 | 浙江帅康电气股份有限公司 | The garbage pulverator of work functions is automatically stopped with zero load |
| CN112637991A (en) * | 2019-09-20 | 2021-04-09 | 台达电子工业股份有限公司 | Power supply applied to light emitting diode and operation method thereof |
| CN113692092A (en) * | 2021-08-19 | 2021-11-23 | 江苏达伦电子股份有限公司 | Control system capable of reducing energy consumption of intelligent projection ceiling lamp |
| CN114024446A (en) * | 2022-01-07 | 2022-02-08 | 深圳市永联科技股份有限公司 | Switching module, voltage stabilization control method and related device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107018594B (en) | 2020-02-14 |
| WO2018184311A1 (en) | 2018-10-11 |
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