CN205124079U - LED (Light -Emitting diode) driving device - Google Patents
LED (Light -Emitting diode) driving device Download PDFInfo
- Publication number
- CN205124079U CN205124079U CN201520914643.7U CN201520914643U CN205124079U CN 205124079 U CN205124079 U CN 205124079U CN 201520914643 U CN201520914643 U CN 201520914643U CN 205124079 U CN205124079 U CN 205124079U
- Authority
- CN
- China
- Prior art keywords
- resistance
- circuit
- switching device
- led drive
- drive device
- 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.)
- Withdrawn - After Issue
Links
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model discloses a LED (Light -Emitting diode) driving device, including LED constant current output device, with output Rectifier filter circuit that constant current output device connects, with power conversion circuit that output Rectifier filter circuit connects, with power conversion circuit connection's rectification filter circuit, control the PWM controller of power conversion circuit and one end and the connection of rectification filter circuit, the other end and the protection controller that the PWM controller is connected, PWM controller have the current sample end with the protection controller is connected, the protection controller includes switching device, sampling input voltage peak value and control sampling circuit, little resistance circuit that switching device switched on and turn -offed and connect in parallel in the big resistance circuit at switching device both ends, when input voltage exceeded the peak value, switching device switched on, big resistance circuit by the short circuit and to the current sample end output heavy current of PWM controller, thereby control LED constant current output device's output current descends.
Description
[technical field]
The utility model relates to a kind of drive unit, especially a kind of LED drive device.
[background technology]
LED illumination is energy-conservation because of it, safety and environmental protection, long service life, fast response time, and luminous efficiency is high, is easy to the advantages such as control, progressively enters into daily life fast.But under condition of equivalent, the size of LED drive current is directly proportional to himself caloric value, and the electric current of driving LED is larger, the heat of LED self-heating is also more.In this case, the light fixture built-in for LED driver, the temperature of LED lamp cavity, by rising sharply, will reduce greatly as its reliability of electronic devices and components forming LED driver.Consider the situation of LED lamp and ambient temperature excess temperature abnormal in input voltage overvoltage, the reliability of LED driver will lose efficacy rapidly.
In the design of traditional LED driver, generally all can carry out line voltage compensation to LED output current, to prevent from along with the rising of input voltage, output current floating.But find in the application of reality, this compensation way is very faint; Especially when input voltage occurs that severe overvoltage is overheated time, if now the electric current of LED can not control in time, the electronic devices and components of composition driver will face the adverse circumstances of overheated overvoltage and occur the situation of premature failure.
Therefore, in order to overcome above-mentioned defect, be necessary the LED drive device that a kind of improvement is provided.
[utility model content]
The purpose of this utility model is to provide a kind of LED drive device.
To achieve these goals, the utility model adopts following technical scheme: a kind of LED drive device, comprise LED constant current output device, the output rectifier and filter be connected with described constant current output device, the power conversion circuit be connected with described output rectifier and filter, the current rectifying and wave filtering circuit be connected with described power conversion circuit, control the PWM controller of described power conversion circuit, and one end is connected with described current rectifying and wave filtering circuit, the protection controller that the other end is connected with described PWM controller, PWM controller has current sample end and is connected with described protection controller, described protection controller comprises switching device, sampled input voltage peak value also controls the sample circuit of described switching means into conduction and shutoff, little resistance circuit and be parallel to the large resistance circuit at described switching device two ends, when described input voltage exceedes peak value, switching means into conduction, described large resistance circuit be shorted and to described PWM controller current sample end export big current, thus the output current controlling described LED constant current output device declines.
Preferably, described switching device is field effect transistor, and described sample circuit connects the grid of described field effect transistor.
Preferably, one end of described little resistance circuit connects described input voltage, and the other end connects described switching device.
Preferably, described large resistance circuit and described switching device source electrode and drain in parallel.
Preferably, described protection controller also comprises voltage stabilizing didoe, and described voltage stabilizing didoe one end connects the grid of described switching device, other end ground connection.
Preferably, described protection controller also comprises electric capacity, and described electric capacity one end connects the grid of described switching device, other end ground connection.
Preferably, described protection controller also comprises semistor, and described semistor one end connects the grid of described switching device, other end ground connection.
Preferably, described little resistance circuit comprises the first resistance and second resistance of series connection.
Preferably, described large resistance circuit comprises the 3rd resistance and the 4th resistance of series connection, and described 3rd resistance is connected with the second resistance.
Preferably, sample circuit comprises the 6th resistance and the 7th resistance of series connection, and described 7th resistance is connected with the grid of switching device.
Compared to prior art, the utility model LED drive device has following advantage: when input voltage occurs that overvoltage is overheated, the output current of LED drive device can be made to decline, thus the temperature of LED drive device can not be made sharply to increase.When input voltage recovers normal, LED drive device again can steady operation again.
[accompanying drawing explanation]
Fig. 1 is the schematic diagram of the utility model LED drive device.
Fig. 2 is the circuit diagram of the protection controller of the first preferred embodiment of the utility model LED drive device.
Fig. 3 is the circuit diagram of the protection controller of the second preferred embodiment of the utility model LED drive device.
[embodiment]
Please refer to shown in Fig. 1 and Fig. 2; a kind of LED drive device 1 of the first preferred embodiment of the present utility model, comprises LED constant current output device, the output rectifier and filter be connected with constant current output device, the power conversion circuit be connected with output rectifier and filter, the current rectifying and wave filtering circuit be connected with power conversion circuit, the PWM controller controlling power conversion circuit and one end is connected with current rectifying and wave filtering circuit, the other end is connected with PWM controller protection controller 10.PWM controller has current sample end 11 and is connected with protection controller 10; protection controller 10 comprises switching device Q1, sampled input voltage peak value the sample circuit 12 of control switch device Q1 turn-on and turn-off, little resistance circuit 13 and is parallel to the large resistance circuit 14 at switching device Q1 two ends; when input voltage exceedes peak value; switching device Q1 conducting; large resistance circuit 14 is shorted and current sample end 11 to PWM controller exports big current, thus the output current controlling LED constant current output device declines.In LED drive device 1 of the present utility model; when inlet highway voltage exceedes the upper limit of design defined time; this protection controller 10 is by work; the output current of LED constant current output device presents the non-linear range of decrease; and reach the object accelerating the range of decrease, and range of decrease ratio can be selected accurately to control by component parameter.When this abnormal input voltage returns in normal range of operation, this protection controller 10 will quit work, and the output current of LED constant current output device returns to rated value.
LED drive device 1 also comprises sampling resistor R5, and sampling resistor R5 one end connects the current sample end 11 of PWM controller, one end ground connection.
Switching device Q1 is field effect transistor, and sample circuit 12 connects the grid of field effect transistor.One end of little resistance circuit 13 connects input voltage, other end connecting switch Q1.The source electrode of large resistance circuit 14 and switching device Q1 and drain in parallel.Protection controller 10 also comprises voltage stabilizing didoe ZD1, the grid of voltage stabilizing didoe ZD1 one end connecting switch Q1, other end ground connection.Protection controller 10 also comprises electric capacity C1, the grid of electric capacity C1 one end connecting switch Q1, other end ground connection.In the present embodiment, protection controller 10 also comprises the eight resistance R8 in parallel with electric capacity C1, the grid of the 8th resistance R8 one end connecting switch Q1, other end ground connection.In other embodiments, please refer to shown in Fig. 3, in the utility model second preferred embodiment; 8th resistance R8 is semistor PTC1; the grid of semistor PTC1 one end connecting switch Q1, other end ground connection, thus realize overheat protective function.And in other embodiments, switching device Q1 also can replace with controllable silicon, realizes the defencive function of input voltage overvoltage.
In the present embodiment, little resistance circuit 13 comprises the first resistance R1 and the second resistance R2 of series connection.Large resistance circuit 14 comprises the 3rd resistance R3 and the 4th resistance R4 of series connection.3rd resistance R3 is connected with the second resistance R2.Sample circuit 12 comprises the 6th resistance R6 and the 7th resistance R7 of series connection, and the 7th resistance R7 is connected with the grid of switching device Q1.In other embodiments, the resistance number of little resistance circuit 13, large resistance circuit 14 and sample circuit 12 can adjust as required.
During work, when input voltage is in normal range of operation: the first resistance R1, the second resistance R2, the 3rd resistance R3, the 4th resistance R4 because of value comparatively large, the electric current poured into current sample end 11 by busbar voltage is minimum, and linear voltage compensates very faint.The gate drive voltage of switching device Q1
when the voltage of Vbus is in normal range of operation time; make switching device Q1 cannot normally by the resistance reasonably choosing the 6th resistance R6, the 7th resistance R7 and the 8th resistance R8; protection controller 10 does not work, the impact of the uncontrolled circuit of output current of LED constant current output device.When input voltage is in overvoltage or condition of instant error fluctuates higher than upper limit operation voltage time: namely
, switching device Q1 enters into saturation conduction state from Linear Amplifer state gradually, and because of the 3rd resistance R3 and the 4th resistance R4 and switching device Q1 parallel join, now its both end voltage is close to zero voltage value.The 3rd resistance R3 in this protection controller 10 and the value of the 4th resistance R4 are much larger than the value of the first resistance R1 and the second resistance R2; therefore, when switching device Q1 conducting, busbar voltage pours into larger offset current by by the first resistance R1 and the second resistance R2 to the current sample end 11 of PWM controller.Therefore, the voltage on sampling resistor R5 will reach threshold voltage in advance, PWM controller internal logic signal be closed and export.The selection of the different parameters of the 6th resistance R6, the 7th resistance R7, the 8th resistance R8 and voltage stabilizing didoe ZD1 can change overvoltage abnormal under the setting of protection point.The selection of the first resistance R1, the second resistance R2 parameter can control the reduction amplitude of the output current of the LED constant current output device under overpressure condition, and resistance is selected less, and the output current of LED constant current output device declines more.
In time inputting overvoltage phenomenon and remove; because this protection controller 10 uses power switch pipe; it is voltage-controlled device; response speed quickly; when the voltage of Vgs end is once after dropping to gate pole threshold voltage; switching device Q1 will exit conducting state, and this protection controller 10 quits work, and the output current of LED constant current output device returns in rated range.
In addition, if the R8 in foregoing circuit to be replaced by the PTC themistor with positive temperature coefficient, the defencive function under overheated abnormal conditions can be realized by the Proper Match of different parameters, because of the principle of defencive function and foregoing description similar, no longer repeat; The type selecting of rational PTC themistor, the function realizing overheated abnormal protection that can be independent, also can realize the double protection functions under not only there is heat anomaly but also there are overvoltage abnormal conditions simultaneously.
Should be noted that, embodiment of the present utility model has preferably implementation, and not any type of restriction is done to the utility model, any person skilled in art of being familiar with may utilize the technology contents of above-mentioned announcement change or be modified to equivalent effective embodiment, in every case the content of technical solutions of the utility model is not departed from, the any amendment done above embodiment according to technical spirit of the present utility model or equivalent variations and modification, all still belong in the scope of technical solutions of the utility model.
Claims (10)
1. a LED drive device, it is characterized in that: described LED drive device comprises LED constant current output device, the output rectifier and filter be connected with described constant current output device, the power conversion circuit be connected with described output rectifier and filter, the current rectifying and wave filtering circuit be connected with described power conversion circuit, control the PWM controller of described power conversion circuit, and one end is connected with described current rectifying and wave filtering circuit, the protection controller that the other end is connected with described PWM controller, PWM controller has current sample end and is connected with described protection controller, described protection controller comprises switching device, sampled input voltage peak value also controls the sample circuit of described switching means into conduction and shutoff, little resistance circuit and be parallel to the large resistance circuit at described switching device two ends, when described input voltage exceedes peak value, switching means into conduction, described large resistance circuit be shorted and to described PWM controller current sample end export big current, thus the output current controlling described LED constant current output device declines.
2. LED drive device as claimed in claim 1, is characterized in that: described switching device is field effect transistor, and described sample circuit connects the grid of described field effect transistor.
3. LED drive device as claimed in claim 2, is characterized in that: one end of described little resistance circuit connects described input voltage, and the other end connects described switching device.
4. LED drive device as claimed in claim 2, is characterized in that: the source electrode of described large resistance circuit and described switching device with drain in parallel.
5. LED drive device as claimed in claim 2, it is characterized in that: described protection controller also comprises voltage stabilizing didoe, described voltage stabilizing didoe one end connects the grid of described switching device, other end ground connection.
6. LED drive device as claimed in claim 2, it is characterized in that: described protection controller also comprises electric capacity, described electric capacity one end connects the grid of described switching device, other end ground connection.
7. LED drive device as claimed in claim 2, it is characterized in that: described protection controller also comprises semistor, described semistor one end connects the grid of described switching device, other end ground connection.
8. LED drive device as claimed in claim 2, is characterized in that: described little resistance circuit comprises the first resistance and second resistance of series connection.
9. LED drive device as claimed in claim 8, is characterized in that: described large resistance circuit comprises the 3rd resistance and the 4th resistance of series connection, and described 3rd resistance is connected with the second resistance.
10. LED drive device as claimed in claim 9, is characterized in that: sample circuit comprises the 6th resistance and the 7th resistance of series connection, and described 7th resistance is connected with the grid of switching device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520914643.7U CN205124079U (en) | 2015-11-17 | 2015-11-17 | LED (Light -Emitting diode) driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520914643.7U CN205124079U (en) | 2015-11-17 | 2015-11-17 | LED (Light -Emitting diode) driving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205124079U true CN205124079U (en) | 2016-03-30 |
Family
ID=55579644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520914643.7U Withdrawn - After Issue CN205124079U (en) | 2015-11-17 | 2015-11-17 | LED (Light -Emitting diode) driving device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205124079U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106714362A (en) * | 2015-11-17 | 2017-05-24 | 欧普照明股份有限公司 | LED driving apparatus |
| CN109121268A (en) * | 2018-08-21 | 2019-01-01 | 江苏优为视界科技有限公司 | A kind of high efficiency intelligent fluorescent lamp control system |
-
2015
- 2015-11-17 CN CN201520914643.7U patent/CN205124079U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106714362A (en) * | 2015-11-17 | 2017-05-24 | 欧普照明股份有限公司 | LED driving apparatus |
| CN106714362B (en) * | 2015-11-17 | 2019-01-18 | 欧普照明股份有限公司 | A kind of LED drive device |
| CN109121268A (en) * | 2018-08-21 | 2019-01-01 | 江苏优为视界科技有限公司 | A kind of high efficiency intelligent fluorescent lamp control system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20140313626A1 (en) | Programmable high voltage energy saving system | |
| CN203734532U (en) | Chopper circuit used for LED driver | |
| CN104768258B (en) | Constant-current driving LED overcurrent-overvoltage protecting circuit | |
| CN205124079U (en) | LED (Light -Emitting diode) driving device | |
| CN102595717A (en) | Protection circuit of light-emitting diode (LED) lamp driving power supply and LED lamp driving power supply | |
| CN103841694B (en) | A kind of light fixture | |
| CN104754800B (en) | A kind of control device of LED modules inrush current | |
| CN203387163U (en) | Protection circuit with branch outputting overvoltage turning-off power supply | |
| CN206572243U (en) | A kind of integrated LED lamp | |
| CN206564464U (en) | A kind of current foldback circuit without sample resistance | |
| CN102625517B (en) | Isolated type LED light fixture adjustable light power supply | |
| CN202475865U (en) | Protection circuit for LED lamp driving power supply, and LED lamp driving power supply | |
| CN205320340U (en) | Silicon controlled rectifier dimming circuit | |
| CN204707331U (en) | A kind of LED drive circuit of surge protection | |
| CN107277996A (en) | A kind of automatic brightness-adjusting table lamp circuit | |
| CN106714362B (en) | A kind of LED drive device | |
| CN104812141B (en) | Switch smooth light modulation LED power supply power controller | |
| CN201426198Y (en) | LED general drive circuit | |
| CN103687152A (en) | Dimming circuit | |
| CN203104914U (en) | Improved LED (Lighting-Emitting Diode) driving circuit | |
| CN204459865U (en) | A kind of power light source integral LED light emitting module | |
| CN203934042U (en) | A kind of high-powered LED lamp dimming control system | |
| CN202405740U (en) | Current-limiting protection circuit of alternating current power supply loop | |
| CN202435654U (en) | LED driving IC chip | |
| CN104093234A (en) | Dimming control system for large-power LED lamp |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160330 Effective date of abandoning: 20190118 |
|
| AV01 | Patent right actively abandoned |