CN1889803A - LED load protector line - Google Patents
LED load protector line Download PDFInfo
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- CN1889803A CN1889803A CN 200510081256 CN200510081256A CN1889803A CN 1889803 A CN1889803 A CN 1889803A CN 200510081256 CN200510081256 CN 200510081256 CN 200510081256 A CN200510081256 A CN 200510081256A CN 1889803 A CN1889803 A CN 1889803A
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- Prior art keywords
- led load
- load unit
- led
- voltage
- protector line
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Abstract
A protector circuit of LED load consists of constant current source output end and LED load unit end. It is featured as connecting a protective circuit for protecting LED load unit between said output end and said load unit end and parallel-connecting said protective circuit with LED load unit, ensuring normal operation of the other LED load and power supply and connecting load after load is changed without power supply off when any LED is on open circuit and said LED is short-circuited as by-pass by protective circuit.
Description
Technical field
The present invention relates to a kind of semiconductor illumination device light fixture, refer in particular to a kind of LED load protector line.
Background technology
LED belongs to light emitting semiconductor device.Along with the development of LED technology, illuminating power-type LED is also corresponding to come into the market, such as 1W, 3W, 5W etc.Need under rated current work the same with low-power LED of these power-type LEDs promptly needs the constant current power supply.Power-type LED generally is a plurality of uses, and that is to say connects after a plurality of LED are by certain connection uses.Connect also just to have following problem since be: if LED damages (the LED damaged condition has: open circuit, short circuit, internal resistance increase) and under open circuit situation, other LED can't work so; If a LED damages and the internal resistance increase, the loss meeting increases the load that promptly increases the weight of constant-current source so.In addition, the output voltage of constant-current source is very high when zero load, if this moment directly inserts the LED load then impacting with high pressure can damage the LED load.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of LED load protector line, thereby solve the protection problem of present LED product.
Technical scheme of the present invention is as follows:
A kind of LED load protector line is provided; it comprises constant-current source output and input LED load end; connection one is used to protect the protector line of LED load unit between described constant-current source output and input LED load end; it is in parallel with the LED load unit; when a certain LED load unit open circuit or internal resistance increase; this protector line can be with this paths of LEDs load unit short circuit; guarantee the operate as normal of other LED load unit and constant-current source; after changing the LED load unit; protector line will be closed short-circuit function automatically, connect the LED load unit.
Described protector line comprises three conventional, electric-resistance R1, R2, R3, temperature-sensing element (device) RT, voltage-stabiliser tube, triode, controllable silicon and DC plug.
Described controllable silicon also can use triode or relay or metal-oxide-semiconductor field effect t or thyristor.
The time-delay booster circuit of described triode, RT, voltage-stabiliser tube and a conventional, electric-resistance R3 composition also can use the IC device.
Beneficial effect of the present invention is: the constant-current source that the present invention is used for power-type LED with the multichannel loading protector line by between described constant-current source input and LED load unit, connecting a protection circuit that is used to protect constant-current source and LED load unit; it is in parallel with the LED load unit; when a certain LED open circuit or internal resistance increase; this protective circuit can be about to this paths of LEDs short circuit this LED bypass; guarantee the operate as normal of other LED load unit and constant-current source; changing LED need not powered-down; after changing load; connect protective circuit and will close short-circuit function automatically, connect load.By this protection circuit, solved the problem of LED multichannel loading protection.
Description of drawings
Fig. 1 is a kind of LED load protector line of the present invention application drawing;
Fig. 2 is a kind of LED load protector line of the present invention schematic diagram;
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
See also Fig. 1; a kind of LED load protector line of the present invention comprises constant-current source output 1, protector line 2 and LED load unit 3; wherein protector line 2 is in parallel with LED load unit 3; when a certain LED load unit 3 open circuits or internal resistance increase; this protector line 2 can guarantee the operate as normal of other LED load unit 3 and constant-current source 2 with these paths of LEDs load unit 3 short circuits, after changing LED load unit 3; protector line 2 will be closed short-circuit function automatically, connect LED load unit 3.
See also Fig. 2, present embodiment is under LED load access state, and switch S 1 state of DC socket as shown in the figure; When taking off the LED load, the gear of switch S 1 is dialled to the left side, and short circuit connects protector line.R
TBe temperature and resistance, its initial value is generally less than the internal resistance of LED load.
When LED load unit 3 damages disconnection or internal resistance increase, both end voltage increases, make voltage-stabiliser tube Z1 conducting, drive triode simultaneously and make the triode conducting, electric current flows through temperature and resistance, and the resistance of temperature and resistance RT slowly increases then, and the voltage at two ends also slowly increases, make controllable silicon trigger after voltage increases to a certain degree, short circuit LED load unit 3 is closed triode simultaneously.When taking off LED load unit 3,1 group of the switch S of DC socket is to the left side, and short circuit connects protector line 2, closes controllable silicon, connect LED load unit 3 after can not trigger controllable silicon because voltage is not high enough.And the operating voltage at triode and RT two ends is higher than the operating voltage of LED load unit 3, so 3 work of LED load unit, triode is closed.Controllable silicon in this circuit also can use triode or relay or metal oxide factory effect pipe or thyristor.The time-delay booster circuit that triode, RT, voltage-stabiliser tube, R3 form also can use the IC device.The concrete operation principle of this protector line 2 is as follows.
Under LED load unit 3 normal operation:
LED load unit 3 both end voltage are at 3 ~ 3.7V, just at the voltage that connects the protection circuit two ends at 3～3.7V, and voltage-stabiliser tube Z1 is 3.9V or big slightly, so not conducting of voltage-stabiliser tube, just triode T1 does not have base current, triode is closed.The function of resistance R 3 is to draw the leakage current of Z1, guarantees that further triode reliably closes (when LED load unit 3 operate as normal) by any electric current, guarantees that LED load unit 3 works under rated current.The controllable silicon trigger electrode links to each other with the dividing point of resistance R 1, R2.We are provided with the value of R1, R2, make not trigger controllable silicon when both end voltage is no more than 4.5V (its both end voltage is lower than 4.5V during LED load unit 3 operate as normal).So not conducting of controllable silicon during LED load unit 3 operate as normal, controllable silicon does not influence LED load unit 3 operate as normal yet.
LED damages and is under the situation about disconnecting:
General constant-current source output 1 all has a maximum output voltage rated value V
OUTMAX(we suppose that this constant-current source maximum output voltage is 40V), and the LED load unit 3 maximum voltage V of our actual use
LOADMAXCan not surpass constant-current source maximum output voltage rated value V
OUTMAX, i.e. V
LOADMAX＜V
OUTMAXIf the V of a constant-current source
OUTMAX=40V, load is 6 great power LED load units 3, the rated voltage during each LED load unit 3 operate as normal is 3.5V, so the total voltage V of actual loading
LOAD=6 * 3.5=21V, V at this moment
LOAD＜V
OUTMAXWhen disconnecting when some LED load unit 3 damages; output current just becomes 0 suddenly; and the constant-current source output voltage will rise rapidly; that is to say with the voltage that is connected the protection circuit two ends of this LED parallel connection and can begin rapid rising from 3.5V; in the process that connects the rising of protection circuit both end voltage, both end voltage reaches V
Z+ 0.6=4.5V (V
ZBe the nominal parameter 3.9V of voltage-stabiliser tube, 0.6V is the base-on voltage of triode) time, the voltage-stabiliser tube conducting, triode obtains also conducting of base current, so electric current I flows through temperature and resistance R
TWith triode T1, make load and constant-current source formation loop and continue conducting.Because R
TBe temperature and resistance, and consumed power W=I
2* R
T, produce certain heat, along with the rising of temperature, resistance R
TSlowly increase, just voltage V
RT=I * R
TIncrease, connect the voltage V=V at protection circuit two ends
RT+ V
TriodeSo V is also increasing; through after a while, when V increased to a certain degree, the partial pressure value of R1, R2 was greater than the controllable silicon trigger voltage; then can trigger controllable silicon T2 and make the controllable silicon conducting; both end voltage is about about 1V about promptly connecting the protection circuit both end voltage about 1V after the controllable silicon conducting, and voltage-stabiliser tube Z1 will close this moment, and triode loses base current; triode is closed, and is kept the conducting of electric current by controllable silicon.So just can guarantee that remaining several LED load unit 3 can continue operate as normal, also not increase the power consumption of constant-current source simultaneously.
Under 3 damages of LED load unit and situation for the internal resistance increase:
Sometimes LED load unit 3 damages its internal resistance of back R
LEDCan increase, and the constant-current source electric current is constant, so the voltage V at LED two ends
LED=I * R
LEDAlso increasing, when voltage increased to the 4.5V left and right sides, with conducting, this moment, triode and LED had electric current to flow through as top said triode, and when voltage rises again, controllable silicon will be triggered and conducting, bypass LED load and close triode.
LED load unit 3 damages and is under the situation of short circuit:
When LED load unit 3 damaged and is short circuit, electric current directly flow through from LED, does not influence the operate as normal of other LED load units 3 and constant-current source 1.
Change under the situation of LED load unit 3:
LED load unit 3 be connected protector line 2 and link to each other by a DC plug.When pulling up the DC plug of LED load unit 3, switch S 1 will be dialled to left end, and short circuit connects protection circuit, and controllable silicon is closed by short circuit, and the electric current that flows through temperature and resistance RT simultaneously is 0, and temperature slowly reduces, and resistance also will prolong in time and reduce.When connecting the LED load unit of having changed 3, switch S 1 will be dialled to right-hand member, owing between plug shake is arranged, so triode may be worked, (operating time that connects LED load unit 3 is very short but because the resistance of temperature and resistance RT is less, the resistance of temperature and resistance RT can not increase at once is enough to trigger controllable silicon), can not trigger controllable silicon.When DC socket contacts when good, the operating voltage of LED load is 3.5V, and voltage-stabiliser tube is 3.9V, so triode can be closed.So when changing LED load unit 3, do not need powered-down, and operation is simple and reliable.
Claims (4)
1; a kind of LED load is protected and is expanded the device circuit; it comprises constant-current source output and input LED load unit end; it is characterized in that; connection one is used to protect the protector line of LED load unit between described constant-current source output and input LED load end; it is in parallel with the LED load unit; when a certain LED load unit open circuit or internal resistance increase; this protector line can be with this paths of LEDs load unit short circuit; guarantee the operate as normal of other LED load unit and constant-current source; after changing the LED load unit; protector line will be closed short-circuit function automatically, connect the LED load unit.
2, a kind of LED load protector line according to claim 1 is characterized in that, described protector line comprises three conventional, electric-resistance R1, R2, R3, temperature-sensing element (device) RT, voltage-stabiliser tube, triode, controllable silicon and DC plug.
3, a kind of LED load protector line according to claim 2 is characterized in that described controllable silicon also can use triode or relay or metal-oxide-semiconductor field effect t or thyristor.
4, a kind of LED load protector line according to claim 2 is characterized in that, the time-delay booster circuit of described triode, RT, voltage-stabiliser tube and a conventional, electric-resistance R3 composition also can use the IC device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100812560A CN100569038C (en) | 2005-06-27 | 2005-06-27 | A kind of LED load protector line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100812560A CN100569038C (en) | 2005-06-27 | 2005-06-27 | A kind of LED load protector line |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1889803A true CN1889803A (en) | 2007-01-03 |
| CN100569038C CN100569038C (en) | 2009-12-09 |
Family
ID=37579062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100812560A Expired - Fee Related CN100569038C (en) | 2005-06-27 | 2005-06-27 | A kind of LED load protector line |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100569038C (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102045919A (en) * | 2010-08-25 | 2011-05-04 | 李志明 | LED light source self-diagnosis protection system |
| CN102143623A (en) * | 2010-02-01 | 2011-08-03 | 深圳市宏啟光电有限公司 | Drive circuit for LED (light-emitting diode) lamp and short-circuit proof elements of drive circuit |
| CN102201403A (en) * | 2011-05-06 | 2011-09-28 | 电子科技大学 | Thyristor type LED (ight emitting diode) open protector |
| CN102695317A (en) * | 2011-03-22 | 2012-09-26 | 青岛海信电器股份有限公司 | Circuit and method for ensuring normal operation of light source modules |
| CN103001179A (en) * | 2011-09-08 | 2013-03-27 | 海洋王照明科技股份有限公司 | LED luminaire and short-circuit protection circuit thereof |
| CN101720147B (en) * | 2009-07-21 | 2013-04-03 | 海洋王照明科技股份有限公司 | LED driving circuit and LED device |
| CN103368399A (en) * | 2012-03-28 | 2013-10-23 | 欧司朗股份有限公司 | Unloaded output end allowing load driver and method applied to same |
| CN103427395A (en) * | 2012-05-21 | 2013-12-04 | 台达电子工业股份有限公司 | Open circuit protection circuit, open circuit protection method and lighting device |
| TWI450635B (en) * | 2011-09-02 | 2014-08-21 | Delta Electronics Inc | Led lighting system architecture |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102762005A (en) * | 2011-04-28 | 2012-10-31 | 东莞勤上光电股份有限公司 | LED luminaire and LED lamp protecting device |
-
2005
- 2005-06-27 CN CNB2005100812560A patent/CN100569038C/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101720147B (en) * | 2009-07-21 | 2013-04-03 | 海洋王照明科技股份有限公司 | LED driving circuit and LED device |
| CN102143623A (en) * | 2010-02-01 | 2011-08-03 | 深圳市宏啟光电有限公司 | Drive circuit for LED (light-emitting diode) lamp and short-circuit proof elements of drive circuit |
| CN102045919B (en) * | 2010-08-25 | 2014-07-23 | 李志明 | LED light source self-diagnosis protection system |
| CN102045919A (en) * | 2010-08-25 | 2011-05-04 | 李志明 | LED light source self-diagnosis protection system |
| CN102695317A (en) * | 2011-03-22 | 2012-09-26 | 青岛海信电器股份有限公司 | Circuit and method for ensuring normal operation of light source modules |
| CN102201403A (en) * | 2011-05-06 | 2011-09-28 | 电子科技大学 | Thyristor type LED (ight emitting diode) open protector |
| TWI450635B (en) * | 2011-09-02 | 2014-08-21 | Delta Electronics Inc | Led lighting system architecture |
| CN103001179A (en) * | 2011-09-08 | 2013-03-27 | 海洋王照明科技股份有限公司 | LED luminaire and short-circuit protection circuit thereof |
| CN103001179B (en) * | 2011-09-08 | 2016-03-30 | 海洋王照明科技股份有限公司 | A kind of LED lamp and short-circuit protection circuit thereof |
| CN103368399A (en) * | 2012-03-28 | 2013-10-23 | 欧司朗股份有限公司 | Unloaded output end allowing load driver and method applied to same |
| CN103368399B (en) * | 2012-03-28 | 2017-03-01 | 欧司朗股份有限公司 | Allow the unloaded load driver of outfan and method |
| CN103427395A (en) * | 2012-05-21 | 2013-12-04 | 台达电子工业股份有限公司 | Open circuit protection circuit, open circuit protection method and lighting device |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100569038C (en) | 2009-12-09 |
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
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| C41 | Transfer of patent application or patent right or utility model | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20090327 Address after: 7, Guangdong science and technology south 12 Road Lighting Center, Shenzhen hi tech Industrial Park, zip code: 518057 Applicant after: Shenzhen city electric lighting Limited by Share Ltd Co-applicant after: Shenzhen Xinghaodi Electron Co., Ltd. Address before: 7, Guangdong science and technology south 12 Road Lighting Center, Shenzhen hi tech Industrial Park, zip code: 518057 Applicant before: Shenzhen city electric lighting Limited by Share Ltd Co-applicant before: Shenzhen Landlite Ligting MFG. Co., Ltd. Co-applicant before: Zhongzhao Lamp Producing Co., Ltd., Shenzhen City |
|
| C14 | Grant of patent or utility model | ||
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| ASS | Succession or assignment of patent right |
Free format text: FORMER OWNER: SHENZHEN XINGHAODI ELECTRON CO., LTD. Effective date: 20131216 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20131216 Address after: 518057 Guangdong city of Shenzhen province Nanshan District high tech Industrial Park South 12 Road Lighting Technology Center South Tower Patentee after: Shenzhen CE Lighting Co., Ltd. Address before: 7, 518057 floor, South 12 Road Lighting Center, hi tech Industrial Park, Guangdong, Shenzhen Patentee before: Shenzhen CE Lighting Co., Ltd. Patentee before: Shenzhen Xinghaodi Electron Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091209 Termination date: 20140627 |
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| EXPY | Termination of patent right or utility model |