CN203691724U - Hot plug protection circuit used for LED illuminator - Google Patents
Hot plug protection circuit used for LED illuminator Download PDFInfo
- Publication number
- CN203691724U CN203691724U CN201420055879.5U CN201420055879U CN203691724U CN 203691724 U CN203691724 U CN 203691724U CN 201420055879 U CN201420055879 U CN 201420055879U CN 203691724 U CN203691724 U CN 203691724U
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- Prior art keywords
- power tube
- comparator
- hot plug
- led lamp
- lamp string
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- 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
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
Provided is a hot plug protection circuit used for an LED illuminator. The hot plug protection circuit comprises a current source, a filtering capacitor and an LED lamp string. The positive electrode of the current source is connected with one end of the filtering capacitor and the anode of the LED lamp string respectively. The negative electrode of the current source and the other end of the filtering capacitor are connected with the ground. The hot plug protection circuit also comprises a power tube M1, a current detection unit, a state latch and a reset unit. The cathode of the LED lamp string is connected with the drain electrode of the power tube M1. The source electrode of the power tube M1 is connected with the current detection unit. The LED lamp string, the drain electrode of the power tube M1 and the source electrode of the power tube M1 form a conducting branch. The conducting branch is in series with the current detection unit. The output end of the current detection unit is connected with the reset end of the state latch. The reset unit is connected with the setting end of the state latch. The output end of the state latch is connected with the grid electrode of the power tube M1. The hot plug protection circuit effectively decreases the instantaneous peak current generated by the LED lamp string during hot plug and prolongs the LED service life.
Description
Technical field
The utility model belongs to the drive unit of LED luminaire, relates to the protective circuit that a kind of LED drives.
Background technology
With reference to Fig. 1, traditional LED drive scheme, comprises current source 10, filter capacitor C1, LED lamp string; The output plus terminal of current source connects LED lamp string anode, and output negative terminal connects LED lamp string negative electrode, meets filter capacitor C1 between output plus terminal and negative terminal; If LED load open circuit, the output current of current source is 0, and output voltage will maintain its maximum output voltage, the forward conduction voltage that this voltage is greater than LED load while normally working.If now LED load accesses suddenly, the transient voltage at LED two ends equals the maximum output voltage of current source, and the immediate current of LED load will be much higher than safe current scope; And due to the effect of filter capacitor C1, LED lamp string stream will maintain a period of time, very big to the damage of LED.
The defect that existing LED drive circuit exists is: the moment peak current producing in the time of the hot plug of LED lamp string is excessive, damages LED.
Summary of the invention
Excessive and damage shorter deficiency of LED, useful life in order to overcome the moment peak current producing when the hot plug of LED lamp string of existing LED drive circuit, moment peak current that the utility model produces when a kind of effective reduction LED lamp string hot plug is provided, extend the LED hot plug protective circuit for LED luminaire in useful life.
The utility model solves the technical scheme that its technical problem adopts:
A kind of hot plug protective circuit for LED luminaire, comprise current source, filter capacitor and LED lamp string, the positive pole of described current source respectively with one end of described filter capacitor, LED lamp series winding connects, the negative pole of described current source, the equal ground connection of the other end of filter capacitor, described hot plug protective circuit also comprises power tube M1, current detecting unit, status latch and reset unit, described LED lamp string is connected with the drain electrode of power tube M1 simultaneously, the source electrode of described power tube M1 connects current detecting unit, described LED lamp string, the source electrode of the drain electrode of power tube M1 and power tube M1 forms conducting branch road, the described current detecting unit of connecting on described conducting branch road, the output of described current detecting unit is connected with the reset terminal of described status latch, described reset unit is connected with the set end of described status latch, the output of described status latch is connected with the grid of described power tube M1.
Further, described reset unit is voltage comparator, the negative terminal of described voltage comparator is connected with the first given threshold voltage end, and the anode of described voltage comparator is connected with the drain electrode of power tube M1, and the output of described voltage comparator is connected with the set end of described status latch;
Described current detecting unit comprises sampling resistor and comparator, ground connection after the source electrode of described power tube M1 is connected with described sampling resistor, the source electrode of described power tube M1 is connected with the negative terminal of comparator, the anode of described comparator is connected with the second given threshold voltage end, and the output of described comparator is connected with the reset terminal of described status latch.
Or: described current detecting unit comprises sampled power pipe M2 and current comparator, the grid of described power tube M1 is connected with the grid of described sampled power pipe M2, the source electrode of described power tube M1 be connected from the source electrode of described sampled power pipe M2, the anode of described current comparator is connected with given threshold current end, the negative terminal of described current comparator is connected with the drain electrode of sampled power pipe M2, and the output of described current comparator is connected with the reset terminal of described status latch;
Or: described reset unit is timer, and the output of described timer is connected with the set end of described status latch; Described current detecting unit comprises sampling resistor and comparator, ground connection after the source electrode of described power tube M1 is connected with described sampling resistor, the source electrode of described power tube M1 is connected with the negative terminal of comparator, the anode of described comparator is connected with given threshold voltage end, and the output of described comparator is connected with the reset terminal of described status latch;
Or: the output of described status latch is connected with the Enable Pin of an operational amplifier, and the anode of described operational amplifier is connected with the 3rd given threshold voltage end, and the negative terminal of described operational amplifier is connected with the source electrode of power tube M1.
Further, described power tube M1 can be that PMOS pipe or NMOS manage, in the time that power tube is PMOS pipe, and the location swap of power tube and control circuit thereof and LED.
Further, described power tube M1 is triode or metal-oxide-semiconductor, the corresponding NMOS pipe of NPN type triode, the corresponding PMOS pipe of positive-negative-positive triode.
Further, described sampling resistor can be resistance or with the proportional metal-oxide-semiconductor of power tube M1.
The beneficial effects of the utility model are mainly manifested in: the moment peak current that can avoid original LED drive circuit to produce in the time of the hot plug of LED lamp string guarantees that the hot plug in the time that current source is worked of LED lamp string can normally be lighted simultaneously.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of existing LED drive circuit.
Fig. 2 is the circuit diagram of the hot plug protective circuit for LED luminaire of the present utility model.
Fig. 3 is a kind of schematic diagram of hot plug protective circuit.
Fig. 4 is the schematic diagram of another kind of hot plug protective circuit.
Fig. 5 is the schematic diagram of another kind of hot plug protective circuit.
Fig. 6 is the schematic diagram of another kind of hot plug protective circuit.
Fig. 7 is the schematic diagram of another kind of hot plug protective circuit.
Fig. 8 is the schematic diagram of another kind of hot plug protective circuit.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further described.
With reference to Fig. 2 ~ Fig. 8, a kind of hot plug protective circuit for LED luminaire, comprise current source 10, filter capacitor C1 and LED lamp string, the positive pole of described current source 10 respectively with one end of described filter capacitor C1, the anodic bonding of LED lamp string, the negative pole of described current source 10, the equal ground connection of the other end of filter capacitor C1, described hot plug protective circuit also comprises power tube M1, current detecting unit 20, status latch and reset unit 30, the negative electrode of described LED lamp string is connected with the drain electrode of switching tube M1 simultaneously, the source electrode of described switching tube M1 connects current detecting unit, described LED lamp string, the source electrode of the drain electrode of switching tube M1 and switching tube M1 forms conducting branch road, the described current detecting unit 20 of connecting on described conducting branch road, the output of described current detecting unit 20 is connected with the reset terminal of described status latch, described reset unit 30 is connected with the set end of described status latch, the output of described status latch is connected with the grid of described switching tube M1.
The present embodiment, on the basis of original LED drive circuit, has increased a power tube M1, current detecting unit 20, reset unit 30.The negative electrode of LED lamp string connects the drain electrode of power tube M1, and the source electrode of power tube M1 connects current detecting unit, and grid is by current detecting unit and reset unit co-controlling, and when startup, power tube M1 is defaulted as conducting operating state.Current detecting unit 20 detects the electric current that flows through power tube M1, be 0 or while being less than certain value when flowing through the electric current of switching tube M1, think that LED lamp string does not access luminaire, i.e. LED lamp string open circuit, the grid of current detecting unit 20 power ratio control pipe M1 is low level, and power tube M1 is closed; In the time that LED lamp is connected in series into luminaire, the grid of reset unit 30 power ratio control pipe M1 is high level, makes power tube M1 conducting.(Fig. 2)
Further, described reset unit 30 is voltage comparator, the negative terminal of described voltage comparator is connected with the first given threshold voltage end, and the anode of described voltage comparator is connected with the drain electrode of switching tube M1, and the output of described voltage comparator is connected with the set end of described status latch;
Described current detecting unit 20 comprises sampling resistor and comparator, ground connection after the source electrode of described switching tube M1 is connected with described sampling resistor, the source electrode of described switching tube M1 is connected with the negative terminal of comparator, the anode of described comparator is connected with the second given threshold voltage end, and the output of described comparator is connected with the reset terminal of described status latch.
In this scheme, reset unit 30 is a voltage comparator, the relatively threshold voltage V1 of power tube drain voltage and a setting, and its output connects the set end (S) of the preferential status latch of asserts signal; Current detecting unit 20 is a voltage comparator 201 and a current sense resistor RS, the voltage on voltage comparator 201 comparison current sense resistor RS and the threshold value V2 of a setting, and its output connects the reset terminal (R) of status latch; The output of status latch is defaulted as high level; In the time that comparator 201 detects that voltage on RS is less than V2, think LED lamp string open circuit, comparator 201 is exported the reset terminal (R) of high level to status latch, makes status latch output low level arrive the grid of power tube M1, and power tube is closed; The drain voltage that power tube M1 detected when voltage comparator 30 is during higher than V1, think LED lamp be connected in series into, comparator 30 is exported the set end (S) of high level to status latch, makes the grid of status latch output high level to power tube M1, by power tube conducting.(Fig. 3)
Or: current detecting unit can not be connected on described LED lamp string, the drain electrode of switching tube M1 and the source electrode of switching tube M1 and form conducting branch road, but detects the electric current of described conducting branch road by a certain proportion of sampled power pipe.
In this scheme, current detecting unit comprises sampled power pipe M2 and current comparator, the grid of described power tube M1 is connected with the grid of described sampled power pipe M2, the source electrode of described power tube M1 be connected from the source electrode of described sampled power pipe M2, the anode of described current comparator is connected with given threshold current end, the negative terminal of described current comparator is connected with the drain electrode of sampled power pipe M2, and the output of described current comparator is connected with the reset terminal of described status latch; Current comparator relatively flows through the electric current of sampled power pipe M2 and the current value I 1 of a setting, in the time that the electric current of sampling pipe M2 is less than I1, thinks LED lamp string open circuit, and current comparator output high level is to the reset terminal of status latch.(Fig. 4)
Or: described reset unit 30 is a timer.
In this scheme, timer produces the high level pulse at certain hour interval and outputs to the set end (S) of status latch, and when the reset terminal (R end) of status latch is while being high, its output is exported a high level pulse at interval of a period of time.When LED lamp is connected in series after luminaire, status latch output high level, by power tube M1 conducting, now has electric current and flows through M1, makes current detecting unit output low level, and then makes power tube M1 keep conducting.(Fig. 5)
Or: current detecting unit and reset unit can be direct power ratio control pipe, but carry out the grid of power ratio control pipe by an operational amplifier or other control circuits, and then control the electric current that flows through power tube.The output of described status latch is connected with the Enable Pin of operational amplifier, and the anode of described operational amplifier is connected with the 3rd given threshold voltage end, and the negative terminal of described operational amplifier is connected with the source electrode of switching tube M1.
In this scheme, current detecting unit and reset unit, by the grid of an operational amplifier power ratio control pipe M1, are controlled the maximum current that flows through M1 simultaneously.(Fig. 6)
Or: power tube M1 can be PMOS pipe.
In this scheme, the location swap of power tube and LED lamp string, the source electrode of PMOS pipe connects current detecting unit, and drain electrode connects the anode of LED lamp string; (Fig. 7)
Or: power tube M1 can be triode or metal-oxide-semiconductor, can use NPN type triode (N-type metal-oxide-semiconductor) or positive-negative-positive triode (P type metal-oxide-semiconductor).(Fig. 8)
In the present embodiment, in the time that LED lamp string does not access luminaire, by closing a controlled power tube, the output of prime driver is disconnected, when LED lamp string accesses suddenly luminaire, while being hot plug, then by opening power tube by the access of prime driver, the unnecessary voltage producing while bearing prime driver open-circuit working in the moment of access by power tube, therefore the moment peak current producing can avoid the hot plug of LED lamp string time guarantees that LED lamp string can normally be lighted in the time of hot plug simultaneously.
Content described in the embodiment of this specification is only enumerating of way of realization to utility model design; protection range of the present utility model should not be regarded as only limiting to the concrete form that embodiment states, protection range of the present utility model also and conceive the equivalent technologies means that can expect according to the utility model in those skilled in the art.
Claims (4)
1. the hot plug protective circuit for LED luminaire, comprise current source, filter capacitor and LED lamp string, the positive pole of described current source respectively with one end of described filter capacitor, LED lamp series winding connects, the negative pole of described current source, the equal ground connection of the other end of filter capacitor, it is characterized in that: described hot plug protective circuit also comprises power tube M1, current detecting unit, status latch and reset unit, described LED lamp string is connected with the drain electrode of power tube M1 simultaneously, the source electrode of described power tube M1 connects current detecting unit, described LED lamp string, the source electrode of the drain electrode of power tube M1 and power tube M1 forms conducting branch road, the described current detecting unit of connecting on described conducting branch road, the output of described current detecting unit is connected with the reset terminal of described status latch, described reset unit is connected with the set end of described status latch, the output of described status latch is connected with the grid of described power tube M1.
2. the hot plug protective circuit for LED luminaire as claimed in claim 1, it is characterized in that: described reset unit is voltage comparator, the negative terminal of described voltage comparator is connected with the first given threshold voltage end, the anode of described voltage comparator is connected with the drain electrode of power tube M1, and the output of described voltage comparator is connected with the set end of described status latch;
Described current detecting unit comprises sampling resistor and comparator, ground connection after the source electrode of described power tube M1 is connected with described sampling resistor, the source electrode of described power tube M1 is connected with the negative terminal of comparator, the anode of described comparator is connected with the second given threshold voltage end, and the output of described comparator is connected with the reset terminal of described status latch.
3. the hot plug protective circuit for LED luminaire as claimed in claim 1, it is characterized in that: described reset unit is timer, described current detecting unit comprises sampling resistor and comparator, ground connection after the source electrode of described power tube M1 is connected with described sampling resistor, the source electrode of described power tube M1 is connected with the negative terminal of comparator, the anode of described comparator is connected with given threshold voltage end, and the output of described comparator is connected with the reset terminal of described status latch;
The output of described status latch is connected with the Enable Pin of operational amplifier, and the anode of described operational amplifier is connected with the 3rd given threshold voltage end, and the negative terminal of described operational amplifier is connected with the source electrode of power tube M1.
4. the hot plug protective circuit for LED luminaire as described in one of claim 1 ~ 3, is characterized in that: described power tube M1 is triode or metal-oxide-semiconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420055879.5U CN203691724U (en) | 2014-01-28 | 2014-01-28 | Hot plug protection circuit used for LED illuminator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420055879.5U CN203691724U (en) | 2014-01-28 | 2014-01-28 | Hot plug protection circuit used for LED illuminator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203691724U true CN203691724U (en) | 2014-07-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420055879.5U Withdrawn - After Issue CN203691724U (en) | 2014-01-28 | 2014-01-28 | Hot plug protection circuit used for LED illuminator |
Country Status (1)
| Country | Link |
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| CN (1) | CN203691724U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US10890300B2 (en) | 2015-03-10 | 2021-01-12 | Jiaxing Super Lighting Electric Appliance Co., Ltd. | LED tube lamp |
| US11441742B2 (en) | 2015-12-09 | 2022-09-13 | Jiaxing Super Lighting Electric Appliance Co., Ltd. | LED tube lamp |
| US11499682B2 (en) | 2014-09-28 | 2022-11-15 | Jiaxing Super Lighting Electric Appliance Co., Ltd. | LED tube lamp and a power supply module thereof |
| US11519567B2 (en) | 2014-09-28 | 2022-12-06 | Jiaxing Super Lighting Electric Appliance Co., Ltd | LED tube lamp |
| US11543086B2 (en) | 2015-03-10 | 2023-01-03 | Jiaxing Super Lighting Electric Appliance Co., Ltd. | LED tube lamp |
| US11686457B2 (en) | 2014-09-28 | 2023-06-27 | Jiaxing Super Lighting Electric Appliance Co., Ltd | LED tube lamp |
| US11754232B2 (en) | 2015-03-10 | 2023-09-12 | Jiaxing Super Lighting Electric Appliance Co., Ltd. | LED lamp and power source module thereof related applications |
-
2014
- 2014-01-28 CN CN201420055879.5U patent/CN203691724U/en not_active Withdrawn - After Issue
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103826363B (en) * | 2014-01-28 | 2016-05-25 | 杰华特微电子（杭州）有限公司 | For the hot plug holding circuit of LED luminaire |
| US11499682B2 (en) | 2014-09-28 | 2022-11-15 | Jiaxing Super Lighting Electric Appliance Co., Ltd. | LED tube lamp and a power supply module thereof |
| US11519567B2 (en) | 2014-09-28 | 2022-12-06 | Jiaxing Super Lighting Electric Appliance Co., Ltd | LED tube lamp |
| US11686457B2 (en) | 2014-09-28 | 2023-06-27 | Jiaxing Super Lighting Electric Appliance Co., Ltd | LED tube lamp |
| US10890300B2 (en) | 2015-03-10 | 2021-01-12 | Jiaxing Super Lighting Electric Appliance Co., Ltd. | LED tube lamp |
| US11226073B2 (en) | 2015-03-10 | 2022-01-18 | Jiaxing Super Lighting Electric Appliance Co., Ltd. | Led tube lamp |
| US11543086B2 (en) | 2015-03-10 | 2023-01-03 | Jiaxing Super Lighting Electric Appliance Co., Ltd. | LED tube lamp |
| US11698170B2 (en) | 2015-03-10 | 2023-07-11 | Jiaxing Super Lighting Electric Appliance Co., Ltd. | LED tube lamp |
| US11754232B2 (en) | 2015-03-10 | 2023-09-12 | Jiaxing Super Lighting Electric Appliance Co., Ltd. | LED lamp and power source module thereof related applications |
| US11441742B2 (en) | 2015-12-09 | 2022-09-13 | Jiaxing Super Lighting Electric Appliance Co., Ltd. | LED tube lamp |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20140702 Effective date of abandoning: 20160525 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |