CN202979393U - Light-intensity-adjustable LED tunnel lamp with automatic over-temperature protection - Google Patents
Light-intensity-adjustable LED tunnel lamp with automatic over-temperature protection Download PDFInfo
- Publication number
- CN202979393U CN202979393U CN2012206349760U CN201220634976U CN202979393U CN 202979393 U CN202979393 U CN 202979393U CN 2012206349760 U CN2012206349760 U CN 2012206349760U CN 201220634976 U CN201220634976 U CN 201220634976U CN 202979393 U CN202979393 U CN 202979393U
- Authority
- CN
- China
- Prior art keywords
- circuit
- light intensity
- tunnel lamp
- led
- led tunnel
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- 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
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model discloses a light-intensity-adjustable LED tunnel lamp with automatic over-temperature protection. The LED tunnel lamp comprises a 90W driving circuit, a light-intensity adjusting circuit, an over-temperature protection circuit and an LED. An alternating current is subjected to rectification and filtering by the 90W driving circuit so as to obtain an output voltage limited within a certain range, thereby providing a constant working current and a safe working voltage to the LED. The light-intensity adjusting circuit uses a PWM controller to adjust a driving current of the LED so as to achieve the purpose of adjusting the output light intensity of the LED. After the LED has been working for a certain time, the temperature of a driving chip in the circuit rises with the temperature of the LED, and if the temperature of the chip is normal, a PTAT voltage is lower than a reference voltage, and the driving circuit work normally; and if the temperature of the chip exceeds a preset turn-off temperature, the PTAT voltage is higher than the reference voltage, and a sensor NMOS transistor and a power NMOS transistor are turned off, thereby achieving the over-temperature protection of the LED tunnel protection.
Description
Technical field
The utility model relates to a kind of LED Tunnel Lamp, relates in particular to a kind of with the adjustable LED Tunnel Lamp of the light intensity of automatic overheat protector.
Background technology
Along with the day by day maturation of LED light source technology, LED has caused concern widely in the application in highway tunnel illumination field.Common Tunnel Lamp drive current is higher, the life-span is shorter, light intensity is non-adjustable, exists certain potential safety hazard and the scope of application very limited.Adopt high light efficiency, good stability, long light source of life-span to replace traditional Tunnel Lamp to become a kind of trend.And the safety problem of Tunnel Lamp mainly works long hours rear excess Temperature by Tunnel Lamp and causes, so, invent and a kind ofly have its special meaning with automatic overheat protector and the adjustable LED Tunnel Lamp of light intensity.
The utility model content
The purpose of this utility model is to provide a kind of with the adjustable LED Tunnel Lamp of the light intensity of automatic overheat protector,
For achieving the above object; the utility model adopts following technical scheme: a kind of with the adjustable LED Tunnel Lamp of the light intensity of automatic overheat protector; comprise: 90W drive circuit, light intensity regulating circuit, thermal-shutdown circuit and LED; described 90W drive circuit is connected with described thermal-shutdown circuit through described light intensity regulating circuit, and described thermal-shutdown circuit is connected to described LED.
Further, described 90W drive circuit is formed by connecting by input filter rectification circuit, circuit of power factor correction, Emmitter diven quasi and feedback control circuit.
Further, comprise the PWM controller in described light intensity regulating circuit.
Further, described thermal-shutdown circuit is comprised of constant-current driven module and temperature sensing module.
Further, described constant-current driven module is formed by connecting by bandgap voltage reference, operational amplifier, buffer circuit, large breadth length ratio power NMOS pipe and sensing NMOS pipe.
Further, described temperature sensing module is formed by connecting by bandgap voltage reference, buffer circuit, PTAT voltage generation circuit, comparator circuit, Nverter circuit and switch NMOS pipe.
Further, described 90W drive circuit employing TEA1751 is main control chip.
Further, 8 pin of described TEA1751 are connected auxiliary winding and are connected with PFC.
Further, described auxiliary winding is that degaussing detects winding.
The LED Tunnel Lamp that the light intensity of the automatic overheat protector of band of the present utility model is adjustable is comprised of 90W drive circuit, light intensity regulating circuit, thermal-shutdown circuit and LED.The processing such as the rectification of alternating current process 90W drive circuit, filtering provide constant operating current and the operating voltage of safety to LED within later output voltage being limited in certain scope.The purpose of adjusting LED output intensity is regulated and then reached to light adjusting circuit to the drive current of LED by the PWM controller.And after LED work certain hour, the temperature of the driving chip of inside circuit raises because of the rising of LED temperature, and when chip temperature was normal, PTAT voltage was less than reference voltage, and drive circuit works; When the chip temperature rising surpassed the shutoff temperature of setting, PTAT voltage was greater than reference voltage, and transducer NMOS pipe and all shutoffs of power NMOS pipe realize the overheat protector to the LED Tunnel Lamp.
Description of drawings
Fig. 1 is the structural representation of the adjustable LED Tunnel Lamp of the light intensity of the automatic overheat protector of band of the present utility model.
Fig. 2 is the schematic diagram of the 90W drive circuit of the adjustable LED Tunnel Lamp of the light intensity of the automatic overheat protector of band of the present utility model;
Fig. 3 is the schematic diagram of the light intensity regulating circuit of the adjustable LED Tunnel Lamp of the light intensity of the automatic overheat protector of band of the present utility model;
Fig. 4 is the constant-current drive circuit structure chart of the thermal-shutdown circuit of the adjustable LED Tunnel Lamp of the light intensity of the automatic overheat protector of band of the present utility model;
Fig. 5 is the PTAT voltage generation circuit figure of temperature sensing module in the thermal-shutdown circuit of the adjustable LED Tunnel Lamp of the light intensity of the automatic overheat protector of band of the present utility model.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 1; the LED Tunnel Lamp that the light intensity of the automatic overheat protector of band of the present utility model is adjustable; comprise 90W drive circuit 1, light intensity regulating circuit 2, thermal-shutdown circuit 3 and LED4; wherein 90W drive circuit 1 is connected with thermal-shutdown circuit 3 through light intensity regulating circuit 2, and thermal-shutdown circuit 3 is connected to LED4.
As shown in Figure 2,90W LED drive circuit 1 based on TEA1751, its AC90V ~ 265V voltage is through BD1 rectification, C1 filtering, obtain high direct voltage voltage after the boosting power factor correction circuit of L2, Q1, D1, this high direct voltage is linked to 16 pin of TEA1751 through transformer centre cap and resistance, pass 1 pin of TEA1751 to capacitor charging by the high-tension current source of TEA1751 inside.When 1 pin voltage rose to 21V, TEA1751 was powered by 1 pin.8 pin of TEA1751 are that the degaussing of PFC detects auxiliary winding input, utilize APFC that this degaussing testing circuit can guarantee to be made of TEA1751 in the situation that any loading condition and alternating supply voltage, circuit working is in the critical conduction mode of operation, and can make the voltage drop on power switch pipe keep minimum.A winding by transformer of the conducting of the 13 pin output pulse control switch pipe Q2 of TEA1751, high-voltage dc voltage, Q2, R15 are to the ground end of power supply, magnetizing inductance stored energy.When the Q2 shutoff, once winding current has the trend of reducing, and the energy in magnetizing inductance produces output voltage by the secondary winding powering load of T1A.Output voltage arranges FEEDBACK CONTROL voltage through photoelectrical coupler U2B to 3 pin of TEA1751 again through voltage sampling, to reach the purpose of regulated output voltage.4 pin that the magnetic reset of circuit of reversed excitation detects by auxiliary winding and TEA1751 form.Auxiliary winding is that degaussing detects winding, and the drain voltage of its both end voltage waveform and switching tube Q2 is basic identical.After this voltage passes through rectifying and wave-filtering on the one hand, give the 1 pin power supply of chip TEA1751, on the other hand, voltage directly leads to by R23 4 pin that are linked to TEA1751.The internal circuit of TEA1751 monitors 4 pin voltage waveforms, makes the voltage drop on power switch pipe keep minimum.4 pin of TEA1751 also have the effect of overvoltage protection and overpower protection simultaneously.
Light intensity regulating circuit 2 as shown in Figure 3 utilizes the PWM controller that drive current is regulated, and to stablize the drive current of LED, obtains stable output intensity.Utilize a measuring resistance that output driving current is sampled, and be converted into feedback voltage signal, stable by the PWM controller to feedback voltage, thus reach the purpose of stablizing output driving current.
Thermal-shutdown circuit 3 is comprised of crossing current driver module and temperature sensing module.
As shown in Figure 4, constant-current driven module mainly comprises bandgap voltage reference, operational amplifier, buffer circuit, large breadth length ratio power NMOS pipe, sensing NMOS pipe.Adopt the linear principle of adjusting to realize constant output driving current, by setting external sample resistance, output current is set in 350 mA.Reference voltage source produces 3.3 V and two reference voltages of 1.45 V, 1.45 the reference voltage of V is sent into the backward end of operational amplifier, the grid voltage that sensing NMOS pipe and power NMOS pipe are controlled in the output of this operational amplifier makes it constant, and obtains thus corresponding drive current.Sense current produces sampling voltage on sample resistance, the difference of 3.3 V reference voltages and this sampling voltage feeds back to the operational amplifier forward end as feedback voltage, the operational amplifier output voltage is adjusted, and then the two-way electric current is adjusted.Namely when power road electric current increased, the sensing path electric current scaled up, and it is large that the pressure drop on sampling resistor becomes, the forward end voltage decreases of operational amplifier, therefore the output of amplifier diminishes, and causes the grid voltage of sensing NMOS pipe and power NMOS pipe to diminish, and electric current reduces; Vice versa.The grid voltage of sensing NMOS pipe and merit NMOS pipe remains constant, guarantees the constant of drive current with this.
In thermal-shutdown circuit, on the other PTAT circuit inductance chip of high-power MOS tube, the variations in temperature of MOS power transistor, produce the voltage signal that is directly proportional to absolute temperature, and exports a control signal V after the 2.75V reference voltage
com, through reverser output V
invThe gate voltage of control switch NMOS pipe, the output high level of comparator is 5 V, low level is 0 V, therefore the operating state of controllable switch NMOS pipe is switched between cut-off region or conducting district.When chip temperature was normal, PTAT voltage was less than 2.75 V reference voltages, and switch NMOS pipe works in cut-off region, the drive circuit normal operation, and thermal-shutdown circuit is not had an effect; And when shutoff temperature that chip temperature rise to surpass is set, PTAT voltage is greater than the 2.75V reference voltage, the output V of comparator
comOverturn, switch NMOS manages conducting, and the gate voltage of sensing NMOS pipe and power NMOS pipe can be pulled down to almost nilly, and sensing NMOS pipe and power NMOS manage all shutoffs.
Claims (9)
1. one kind with the adjustable LED Tunnel Lamp of the light intensity of automatic overheat protector; comprise: 90W drive circuit (1), light intensity regulating circuit (2), thermal-shutdown circuit (3) and LED(4); it is characterized in that: described 90W drive circuit (1) is connected with described thermal-shutdown circuit (3) through described light intensity regulating circuit (2), and described thermal-shutdown circuit (3) is connected to described LED(4).
2. the adjustable LED Tunnel Lamp of the light intensity of the automatic overheat protector of band as claimed in claim 1, it is characterized in that: described 90W drive circuit (1) is formed by connecting by input filter rectification circuit, circuit of power factor correction, Emmitter diven quasi and feedback control circuit.
3. the adjustable LED Tunnel Lamp of the light intensity of the automatic overheat protector of band as claimed in claim 1, is characterized in that: comprise the PWM controller in described light intensity regulating circuit (2).
4. the adjustable LED Tunnel Lamp of the light intensity of the automatic overheat protector of band as claimed in claim 1, it is characterized in that: described thermal-shutdown circuit (3) is comprised of constant-current driven module and temperature sensing module.
5. the adjustable LED Tunnel Lamp of the light intensity of the automatic overheat protector of band as claimed in claim 4 is characterized in that: described constant-current driven module is formed by connecting by bandgap voltage reference, operational amplifier, buffer circuit, large breadth length ratio power NMOS pipe and sensing NMOS pipe.
6. the adjustable LED Tunnel Lamp of the light intensity of the automatic overheat protector of band as claimed in claim 4, it is characterized in that: described temperature sensing module is formed by connecting by bandgap voltage reference, buffer circuit, PTAT voltage generation circuit, comparator circuit, Nverter circuit and switch NMOS pipe.
7. the adjustable LED Tunnel Lamp of the light intensity of the automatic overheat protector of band as claimed in claim 1 is characterized in that: it is main control chip that described 90W drive circuit (1) adopts TEA1751.
8. the adjustable LED Tunnel Lamp of the light intensity of the automatic overheat protector of band as claimed in claim 7 is characterized in that: 8 pin of described TEA1751 are connected auxiliary winding and are connected with PFC.
9. the adjustable LED Tunnel Lamp of the light intensity of the automatic overheat protector of band as claimed in claim 8 is characterized in that: described auxiliary winding is that degaussing detects winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012206349760U CN202979393U (en) | 2012-11-27 | 2012-11-27 | Light-intensity-adjustable LED tunnel lamp with automatic over-temperature protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012206349760U CN202979393U (en) | 2012-11-27 | 2012-11-27 | Light-intensity-adjustable LED tunnel lamp with automatic over-temperature protection |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202979393U true CN202979393U (en) | 2013-06-05 |
Family
ID=48520408
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012206349760U Expired - Fee Related CN202979393U (en) | 2012-11-27 | 2012-11-27 | Light-intensity-adjustable LED tunnel lamp with automatic over-temperature protection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202979393U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107222945A (en) * | 2016-03-21 | 2017-09-29 | 优凡株式会社 | LED module control device and the illuminator including the device |
| CN107660013A (en) * | 2016-07-26 | 2018-02-02 | 上海莱托思电子科技有限公司 | A kind of LED both ends constant-current driven chip and constant current driving method |
| CN109498999A (en) * | 2018-12-07 | 2019-03-22 | 中国电子科技集团公司第四十研究所 | A kind of infrared polarizing light therapeutic equipment light intensity regulating circuit |
-
2012
- 2012-11-27 CN CN2012206349760U patent/CN202979393U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107222945A (en) * | 2016-03-21 | 2017-09-29 | 优凡株式会社 | LED module control device and the illuminator including the device |
| CN107660013A (en) * | 2016-07-26 | 2018-02-02 | 上海莱托思电子科技有限公司 | A kind of LED both ends constant-current driven chip and constant current driving method |
| CN107660013B (en) * | 2016-07-26 | 2024-04-05 | 上海莱托思电子科技有限公司 | LED two-end constant-current driving chip and constant-current driving method |
| CN109498999A (en) * | 2018-12-07 | 2019-03-22 | 中国电子科技集团公司第四十研究所 | A kind of infrared polarizing light therapeutic equipment light intensity regulating circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102769959B (en) | LED light-dimming driving circuit | |
| CN102762011B (en) | LED (Light Emitting Diode) constant-current dimming drive circuit device | |
| CN102573189B (en) | Step-down light-emitting diode (LED) driving circuit | |
| CN202979393U (en) | Light-intensity-adjustable LED tunnel lamp with automatic over-temperature protection | |
| CN204392656U (en) | LED drive circuit and LED switch driving power | |
| CN102833902B (en) | Booster type constant current driver circuit for LED | |
| CN105934021A (en) | Overvoltage adjusting circuit for linear constant-current driving LED | |
| CN201210761Y (en) | Road lamp controller | |
| CN203814023U (en) | PAM2842-based dimmable LED driver | |
| CN208509337U (en) | A kind of power circuit with constant current and constant voltage output | |
| CN203243574U (en) | Small-size high-efficient high-power LED lighting driver | |
| CN204145795U (en) | Have APFC function without working frequency ripple wave LED streetlamp power source | |
| CN202663614U (en) | Low-power light emitting diode (LED) constant-current power supply | |
| CN104780644A (en) | Novel constant-current voltage-stabilization flyback type LED driving power supply | |
| CN103179759A (en) | Lamp internal environment temperature-based LED (light emitting diode) driving power supply with self-adaption power controlling function | |
| CN209462649U (en) | It is a kind of for driving the circuit with fast current protection and current regulation function at a slow speed of LED light | |
| CN203015236U (en) | A LED driving power supply | |
| CN103369764B (en) | A LED driving circuit and a LED lamp | |
| CN204681639U (en) | A kind of LED drive circuit | |
| CN103079307B (en) | Constant voltage and constant current circuit for LED (light emitting diode) power supply | |
| CN203242309U (en) | LED backlight module constant-current driving device | |
| CN203708584U (en) | Bidirectional driving LED circuit | |
| CN204291438U (en) | A kind of LED power drive circuit | |
| CN203015238U (en) | Off-line LED driving power supply | |
| CN203660889U (en) | LED driving power source circuit |
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: 20130605 Termination date: 20161127 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |