CN201479418U - LED lamp driving circuit with surge protection - Google Patents
LED lamp driving circuit with surge protection Download PDFInfo
- Publication number
- CN201479418U CN201479418U CN2009201629068U CN200920162906U CN201479418U CN 201479418 U CN201479418 U CN 201479418U CN 2009201629068 U CN2009201629068 U CN 2009201629068U CN 200920162906 U CN200920162906 U CN 200920162906U CN 201479418 U CN201479418 U CN 201479418U
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Abstract
The utility model discloses a LED lamp driving circuit with surge protection. The LED lamp driving circuit comprises a rectification unit for limiting alternating current sine voltage of a commercial power and rectifying alternating current sine voltage into half-wave direct current voltage after absorbing with surge, a voltage delay unit for delaying the half-wave direct current voltage and surge energy release, a switch unit which can receive the control of a switch signal for outputting the half-wave direct current voltage after delayed to drive a LED lamp, and a voltage and temperature detection unit which can detect whether the half-wave direct current voltage exceeds a preset voltage value, when the half-wave direct current voltage does not exceed the preset value, the switch unit is controlled to output and drive the LED lamp to illuminate, when the half-wave direct current voltage exceeds the preset value, the switch unit is controlled to disconnect the output, thereby realizing the automatic protection function when abnormal surge and overhigh voltage surge or temperature occur, and regulating the brightness of LED lamp through regulating the preset voltage value.
Description
Technical field
The utility model is a kind of LED lamp drive circuit of tool surging protection; relate in particular to the drive circuit of a kind of driving LED illuminating lamp, LED light organ or LED-backlit module; can detect the moment surging on the electric power automatically; the fast shut-off supply of electric power, and automatically reply later the drive circuit of supply of electric power at surging.
Background technology
Press, because the LED lamp, has power saving compared to conventional bulb or fluorescent tube, the life-span is long and the advantage of environmental protection, therefore, LED lamp product has replaced conventional bulb gradually or fluorescent tube uses as illuminating lamp.And on advanced person's slim TV screen, the trend of LED lamp as its backlight module that adopts is arranged also.
The driving LED lamp is luminous quite easy, as long as can give LED enough forward bias voltage drop, and it is just passable to be provided at the specified interior direct current of LED, therefore, the drive circuit of general LED all changes direct current to exchange, and the direct current mode of step-down again designs, this mode is the most formidable to be high heat problem when power source conversion takes place, present settling mode all is to install radiating fin additional on the LED lamp, and therefore, the radiating fin on the LED lamp has occupied most volume on the contrary.
At present to have many be directly to use the electric main power supply to the drive circuit of LED lamp, yet the fragility that this kind drive circuit is suitable is very easy to be subjected to the moment surging affected by high on the electric power, produces big electric current and cause the damage of the driven unit or the LED lamp of rear end.
At this phenomenon, present settling mode is to adopt the surging absorbent assembly, and fuse suppresses the surge voltage of moment, but this surging absorbent assembly only can absorb extremely short surging, surges for the surging of broad or for the voltage of alternating current etc., then can't suppress at all, the reaction speed of fuse is then too slow, and when waiting fuse to cut off electric power, driven unit and LED lamp burn already.
For this reason; this case utility model people is in order to solve the disappearance that above-mentioned existing LED lamp drive circuit can't suppress broad moment surging; design a kind of drive circuit that uses the ultrahigh speed switch; can detect the undesired surging high pressure on the electric power; and before entering the LED lamp, surge voltage cuts off supply of electric power; driven unit and LED lamp with the protection rear end; and can do temperature detection; when temperature is too high, can close the LED lamp; treat temperature recover just often with to open; and can solve the danger that may cause because of LED lamp generation high temperature; utilize drive circuit of the present utility model simultaneously; can be used as the brightness adjustment of LED lamp, can be applicable to the illumination LED lamp; on the LED lamp drive circuit of the dimmer of LED lamp or backlight module of video screen or the like.
The utility model content
Main purpose of the present utility model is to provide a kind of LED lamp drive circuit of tool surging protection; can detect the undesired surging high pressure on the electric power and voltage is surged or working temperature etc.; before surge voltage enters the LED lamp or temperature cut off supply of electric power when too high, with the driven unit and the LED lamp of protection rear end.
For achieving the above object, the utility model provides the LED lamp drive circuit of a kind of tool surging protection, comprise that a rectification unit limit earlier in order to the interchange string wave voltage with civil power and the surging absorption after, be rectified into half-wave DC voltage; One voltage delay unit can postpone this half-wave DC voltage and surging energy and discharge; One switch element can be accepted the control of a switching signal, and it is luminous that the half-wave DC voltage output after this is postponed drives this LED lamp; An and voltage detection unit, can detect this half-wave DC voltage and whether exceed a predeterminated voltage value, when this half-wave DC voltage is in the predeterminated voltage value, exporting this switching signal is the high levle voltage signal, it is luminous to control this this LED lamp of switch element output driving, when this half-wave DC voltage exceeded this default pressure value, exporting this switching signal was the low level voltage signal, controlled this switch element and cut off output.
Wherein, this LED lamp is LED bulb or the LED fluorescent tube of being made up of the plurality of LEDs connected in electrical series, perhaps is the LED matrix that the many groups of electric parallel connection are made up of the plurality of LEDs connected in electrical series, forms the backlight module of TV shadow screen.
Wherein, this rectification unit is one to exchange the current-limiting type bridge rectifier, utilizes capacitor to come couple current, and reduces with resistor and capacitor charging/discharging and to exchange surging and surge.
Wherein, this voltage delay unit is by at least one resistor of the electric parallel connection of a surge absorber, form a surging energy and discharge the loop, be a charging and discharging circuit simultaneously, by to this half-wave DC voltage or the voltage charging and the discharge that enter surging, form the surging energy and discharge, and postpone this half-wave DC voltage.
Wherein, this switch element is made up of a first transistor and at least one the 4th resistor and at least one silicon reference diode, the 4th resistor and this silicon reference diode form a current limliting loop, and when this switching signal is output as the high levle voltage signal, this the first transistor conducting, exporting a fixed current, to drive this LED lamp luminous, because of the restriction electric current, can avoid super-high-current to make the LED lamp impaired.
Wherein, the first transistor in this switch element is a high speed field-effect transistor or two-carrier junction transistor.
Wherein, this voltage and temperature detecting unit are formed one fen hydraulic circuit by one first resistor, one second resistor, and be electrically connected to a transistor seconds, utilize this first and second resistor dividing potential drop to produce this predeterminated voltage value, and when this predeterminated voltage value is higher than the conducting bias voltage of this transistor seconds, this transistor seconds conducting, make this switching signal be output as the low level voltage signal, when this predeterminated voltage value is lower than the conducting bias voltage of this transistor seconds, this transistor seconds ends, and makes this switching signal be output as the high levle voltage signal.
Wherein, this voltage and temperature detecting unit for can adjusting the divider resistance value of this first resistor and second resistor, so as to adjusting this predeterminated voltage value, and then are adjusted the driving LED luminous time of lamp, form the light modulation effect.
The LED lamp drive circuit of the tool surging protection that the utility model proposed; can detect the undesired surging high pressure on the electric power and voltage is surged or working temperature etc.; before surge voltage enters the LED lamp or temperature cut off supply of electric power when too high; driven unit and LED lamp with the protection rear end; and can solve the danger that may cause because of LED lamp generation high temperature; the utility model can be applicable on the LED lamp drive circuit of the dimmer of illumination LED lamp, LED lamp or backlight module of video screen or the like as the brightness adjustment of LED lamp simultaneously.
Description of drawings
Fig. 1 is a circuit block diagram of the present utility model;
Fig. 2 is an embodiment circuit diagram of the present utility model;
Fig. 3 A, Fig. 3 B and Fig. 3 C are the utility model voltage waveform view when running into surging;
Fig. 4 A, Fig. 4 B and Fig. 4 C are the waveform schematic diagram of the utility model when running into voltage and surging;
Fig. 5 A, Fig. 5 B and Fig. 5 C are light modulation waveform schematic diagram of the present utility model.
Wherein, Reference numeral:
The 10:LED lamp
11: rectification unit
12: the voltage delay unit
13: switch element
14: voltage and temperature detecting unit
15: the current limliting loop
Embodiment
See also shown in Figure 1ly, be the circuit block diagram of the LED lamp drive circuit of the utility model tool surging protection.And see also shown in Figure 2ly, be embodiment circuit diagram of the present utility model.The LED lamp 10 that the utility model institute drive circuit is driven, LED bulb or the LED fluorescent tube that can form by the plurality of LEDs connected in electrical series, the LED matrixes that also can the many groups of electric parallel connection be formed by the plurality of LEDs connected in electrical series form the backlight module of TV shadow screen.
LED lamp drive circuit of the present utility model, comprise a rectification unit 11, a voltage delay unit 12, a switch element 13 and voltage and temperature detecting unit 14, wherein this rectification unit 11 is to can be one to exchange the current-limiting type bridge rectifier, be electrically connected the interchange string wave voltage of civil power, utilize capacitor C1 to come couple current earlier, and discharge and recharge with capacitor C1 with resistor R 1, reduce and exchange surging and surge, reach current limliting earlier and absorb, and it is rectified into half-wave DC voltage with the primary surging that exchanges.
Wherein this voltage delay unit 12 is electrically connected this rectification unit 11, can postpone this half-wave DC voltage, and carry out the release of secondary surging energy, to wait for the voltage detecting time of this voltage and temperature detecting unit 14, make and surge as abnormal breakthrough or voltage, or temperature is when too high, can detect earlier, and can in time cut off output power, this voltage delay unit 12 can be by at least one discharge resistor of the electric parallel connection of a surge absorber C2, form a surging energy and discharge the loop, be a charging and discharging circuit simultaneously, this discharge resistor is made up of one first resistor R, 4 connected in electrical series, one second resistor R 5 in the embodiment of Fig. 2, and this voltage delay unit 12 can be by to this half-wave DC voltage or the voltage charging and the discharge that enter surging, form the surging energy and discharge, and postpone this half-wave DC voltage.
Wherein this switch element 13 is electrically connected between this rectification unit 11 and this LED lamp 10, shown in Fig. 2 embodiment circuit diagram, this switch element 13 is made up of a first transistor Q1 and at least one the 4th resistor R 3 and at least one silicon reference diode D2, can accept the control of the switching signal of this voltage and temperature detecting unit 14 generations, it is luminous that normal half-wave DC voltage output is driven this LED lamp 10.
Wherein this first transistor Q1 can be a high speed field-effect transistor (Field EffectTransistor) or two-carrier junction transistor (Bipolar Junction Transistor), and the 4th resistor R 3 and the diode D2 that should long-pending receive form a current limliting loop 15, make when this switching signal is output as the high levle voltage signal, this the first transistor Q1 conducting, exporting a fixed current, to drive this LED lamp luminous, and the electric current that it limited can avoid super-high-current to make the LED lamp impaired.
Meaning promptly, when this voltage and temperature detect switch signal are the high levle voltage signal, this the first transistor Q1 conducting, it is luminous to export this LED lamp 10 of this half-wave DC driven, when this switching signal was the low level voltage signal, this first transistor Q1 ended, and cut off the electric power output of this half-wave DC voltage, after this switching signal reverted to the high levle voltage signal, it is luminous that output drives this LED lamp 10 again.
Wherein, this voltage is electrically connected this rectification unit 11 and this switch element 13 with temperature detecting unit 14, whether exceed a predeterminated voltage value in order to detect this half-wave DC voltage, and whether the temperature that detects the LED lamp is too high, embodiment circuit diagram as Fig. 2, this voltage and temperature detecting unit 14 utilize this first resistor R 4 and this second resistor R 5 to form one fen hydraulic circuit, and be electrically connected to a transistor seconds Q2, by this half-wave DC voltage in first and second resistor R 4, the dividing potential drop of R5, produce this predeterminated voltage value, when this half-wave DC voltage is in the predeterminated voltage value, this transistor seconds Q2 ends, exporting this switching signal is the high levle voltage signal, controls this switch element 13 this half-wave DC voltage is exported to this LED lamp 10, and it is luminous to drive this LED lamp 10, and when this half-wave DC voltage exceeds this default pressure value, this transistor seconds Q2 conducting, exporting this switching signal is the low level voltage signal, controls this switch element 13 and cuts off output.In addition, when the LED light temperature was too high, this transistor seconds Q2 can enter conducting state automatically, and exporting this switching signal is the low level voltage signal, controlled this switch element 13 and cut off output.
Shown in Fig. 3 A, 3B and 3C, voltage waveform view when running into surging for the utility model, wherein Fig. 3 A is that alternating voltage input oscillogram, Fig. 3 B of civil power among Fig. 2 are the output voltage waveform of rectification unit 11 among Fig. 2, and Fig. 3 C is the output current wave figure of switch element 13 among Fig. 2.As seen from the figure, when the civil power alternating current is pressed with surging 100 generations,, and make the output of this this halfwave rectifier voltage of switch element 13 temporarily disconnecteds because of surging can exceed predeterminated voltage value A, after treating that surging finishes, this switch element 13 just can continue this halfwave rectifier voltage is exported to the LED lamp.
Similarly, the utility model runs into waveform schematic diagram that voltage surged at 200 o'clock shown in Fig. 4 A, 4B and 4C, wherein Fig. 4 A is that alternating voltage input oscillogram, Fig. 4 B of civil power among Fig. 2 are the output voltage waveform of rectification unit 11 among Fig. 2, and Fig. 4 C is the output current wave figure of switch element 13 among Fig. 2.
This voltage of the present utility model and temperature detecting unit 14 also have the light modulation effect of LED lamp, it mainly is the divider resistance value of adjusting this first resistor R 4 and second resistor R 5, make the dividing potential drop of this half-wave DC voltage on first resistor R 4 and second resistor R 5 change, so as to adjusting this predeterminated voltage value A, as Fig. 5 A, 5B and 5C are depicted as its light modulation waveform schematic diagram, wherein Fig. 5 A is the alternating voltage input oscillogram of civil power among Fig. 2, Fig. 5 B is the output voltage waveform of rectification unit 11 among Fig. 2, and Fig. 5 C is the output current wave figure of switch element 13 among Fig. 2.
When this predeterminated voltage value A is the peak value of this half-wave DC voltage, this half-wave DC voltage all can be exported to the LED lamp, and then make the luminous time of LED lamp the longest and the brightest, when this predeterminated voltage value was reduced to B, this half-wave DC voltage all can be by switch element 13 temporarily disconnecteds in the part that exceeds the predeterminated voltage value, and the fluorescent lifetime of LED lamp is shortened, therefore, make the brightness deepening of LED lamp, form light modulation actor.
In addition; transistor seconds Q2 in this voltage of the present utility model and the temperature detecting unit 14 can make the transistor of apparatus temperature detection; make when the temperature of LED lamp is increased to transistorized temperature rating; this transistor seconds Q2 meeting conducting; make this switching signal be output as the low level voltage signal; and then control this LED lamp and cut off output power; and make the temperature of LED lamp reduce; reach the purpose of protection LED lamp; can make that more the LED lamp does not need to use radiating fin, perhaps reduce the volume of radiating fin.
Certainly; the utility model also can have other various embodiments; under the situation that does not deviate from the utility model spirit and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and distortion according to the utility model, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the utility model.
Claims (8)
1. the LED lamp drive circuit of a tool surging protection is characterized in that, comprising:
One rectification unit, the interchange string wave voltage of electrical connection civil power;
One voltage delay unit is electrically connected this rectification unit;
One switch element is electrically connected this voltage delay unit and this LED lamp, accepts the control of a switching signal, and it is luminous that the half-wave DC voltage output after this is postponed drives this LED lamp; And
One voltage and temperature detecting unit are electrically connected this rectification unit and this switch element.
2. the LED lamp drive circuit of tool surging protection according to claim 1 is characterized in that this LED lamp is LED bulb or the LED fluorescent tube of being made up of the plurality of LEDs connected in electrical series, perhaps is the LED matrix that the many groups of electric parallel connection are made up of the plurality of LEDs connected in electrical series.
3. the LED lamp drive circuit of tool surging protection according to claim 1 is characterized in that, this rectification unit is an interchange current-limiting type bridge rectifier.
4. the LED lamp drive circuit of tool surging protection according to claim 1 is characterized in that, this voltage delay unit is formed a surging energy and discharged the loop by at least one resistor of the electric parallel connection of a surge absorber, is a charging and discharging circuit simultaneously.
5. the LED lamp drive circuit of tool surging protection according to claim 1; it is characterized in that; this switch element is made up of a first transistor and at least one the 4th resistor and at least one silicon reference diode, and the 4th resistor and this silicon reference diode form a current limliting loop.
6. the LED lamp drive circuit of tool surging protection according to claim 5 is characterized in that the first transistor in this switch element is a high speed field-effect transistor or two-carrier junction transistor.
7. the LED lamp drive circuit of tool surging protection according to claim 1 is characterized in that this voltage and temperature detecting unit are formed one fen hydraulic circuit by one first resistor, one second resistor, and are electrically connected to a transistor seconds.
8. the LED lamp drive circuit of tool surging protection according to claim 7 is characterized in that this voltage and temperature detecting unit are adjusted the divider resistance value of this first resistor and second resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201629068U CN201479418U (en) | 2009-08-13 | 2009-08-13 | LED lamp driving circuit with surge protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201629068U CN201479418U (en) | 2009-08-13 | 2009-08-13 | LED lamp driving circuit with surge protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201479418U true CN201479418U (en) | 2010-05-19 |
Family
ID=42415673
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201629068U Expired - Fee Related CN201479418U (en) | 2009-08-13 | 2009-08-13 | LED lamp driving circuit with surge protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201479418U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102685964A (en) * | 2011-03-10 | 2012-09-19 | 晶宏半导体股份有限公司 | Light emitting diode protective module |
| EP3032676A1 (en) * | 2014-12-09 | 2016-06-15 | Electronic Systems Protection, Inc. | Overvoltage notching of electricity delivered to an electrical load |
-
2009
- 2009-08-13 CN CN2009201629068U patent/CN201479418U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102685964A (en) * | 2011-03-10 | 2012-09-19 | 晶宏半导体股份有限公司 | Light emitting diode protective module |
| EP3032676A1 (en) * | 2014-12-09 | 2016-06-15 | Electronic Systems Protection, Inc. | Overvoltage notching of electricity delivered to an electrical load |
| US10014680B2 (en) | 2014-12-09 | 2018-07-03 | Electronic Systems Protection, Inc. | Overvoltage notching of electricity delivered to an electrical load |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100519 Termination date: 20140813 |
|
| EXPY | Termination of patent right or utility model |