CN201114899Y - LED over-heat protection circuit - Google Patents
LED over-heat protection circuit Download PDFInfo
- Publication number
- CN201114899Y CN201114899Y CNU2007201141498U CN200720114149U CN201114899Y CN 201114899 Y CN201114899 Y CN 201114899Y CN U2007201141498 U CNU2007201141498 U CN U2007201141498U CN 200720114149 U CN200720114149 U CN 200720114149U CN 201114899 Y CN201114899 Y CN 201114899Y
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- light
- emitting diode
- pin
- protection circuit
- power module
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Abstract
The utility model relates to a protection circuit for light-emitting diode superheating. The utility model solves the technical problem of providing a protection circuit for light-emitting diode superheating which is reasonably designed in circuits and flexible in application, with less added cost, and can effectively protect the light-emitting diode from damage due to superheating. The technical proposal solves the problem that: the protection circuit for light-emitting diode superheating comprises a power module and a light-emitting diode group and is characterized in that the protection circuit for light-emitting diode superheating is also provided with a temperature control switch which is connected with an input end of the power module, also can be connected between an output end of the power module and an input end of the light-emitting diode group and also can be connected in series in the middle of the light-emitting diode group. The protection circuit of the utility model can be used for lighting, signal indicating and decorative advertising and also can be applied in instruments and equipment.
Description
Technical field
The utility model relates to a kind of light-emitting diode overheating protection circuit.Mainly be applicable to lamp lighting, signal indication, decorative advertisement, also can be applicable to instrument and equipment etc.
Background technology
Light-emitting diode is because of advantages such as its brightness height, long service life, price are low, and the lighting apparatus of forming with light-emitting diode has much development prospect.In the present circumstance, generally be that light-emitting diode, driving power module are directly installed on lamp interior, because light-emitting diode can produce a large amount of heat energy in the course of the work, if the heat energy that these light-emitting diodes produce can not in time be discharged, whole light fixture will continue to heat, in case when temperature surpassed the limiting temperature of light-emitting diode, light-emitting diode will damage immediately, causes bigger economic loss.
Summary of the invention
The technical problems to be solved in the utility model is: provide a kind of circuit design rationally, applying flexible, cost increase seldom but can effectively protect light-emitting diode to cross the light-emitting diode overheating protection circuit of cause thermal damage.
The technical scheme that the utility model adopted is: the light-emitting diode overheating protection circuit, contain power module and light-emitting diode group, and it is characterized in that also being provided with in the described circuit temp control switch.
Described temp control switch is connected the input of power module; Also can be connected between the input of the output of power module and light-emitting diode group; Also can be connected on the centre of light-emitting diode group.
Described temp control switch has shell, the bi-metal plate of arch is housed in it, be pressed with ceramics insulator above the shell, at the center of ceramics insulator embedding one ceramic conversion pin, bi-metal plate is pushed down in its bottom, props up horizontally disposed contact arm above, and described contact arm one end is fixedlyed connected with the bottom of a terminal, the other end is connected with another terminal bottom by the contact, and described two-terminal is by glass roof constraint location.
Described power module comprises by bridge rectifier B
1, capacitor C
2, C
3, inductance L
1The current rectifying and wave filtering circuit that constitutes, buffer circuit D
1, D
2, transformer T
1, special constant-current chip for driving IC
1, optocoupler U
1, by resistance R
7, R
8With triode Q
1The sample circuit that constitutes; Wherein: diode D
1, D
2Connect transformer T
1Main coil, diode D
4Meet transformer T
1Ancillary coil, diode D
5Meet transformer T
1Secondary coil; Special constant-current chip for driving IC
14 pin Vdd power supplys take from auxiliary transformer winding and diode-capacitor circuit, IC
1Pin 1, pin 2 are source electrodes of metal-oxide-semiconductor in the chip, pin 5, pin 6, pin 7, pin 8 are drain electrodes of metal-oxide-semiconductor, pin 3 is feedback pin FB.
The beneficial effects of the utility model are: owing to increased temp control switch in former illumination circuit, can cut off automatically or the connection circuit according to the variations in temperature of light-emitting diode in the circuit, not only protect luminous tube to avoid damaging, also reduce energy consumption.Circuit design is reasonable, and simple installation, cost are low, applied widely, and under total inventive concept and purpose, described temperature detect switch (TDS) can be arranged in the different parts of circuit, to adapt to different requirements.In addition, described temperature detect switch (TDS) has also that temperature-sensitive is fast, resistance is little, is swift in motion, safe and reliable, not arcing, volume are little, the advantage of long service life.
Description of drawings
Fig. 1 is the structural representation of the utility model embodiment 1.
Fig. 2 is the structural representation of the utility model embodiment 2.
Fig. 3 is the structural representation of the utility model embodiment 3.
Fig. 4 is the structure chart of temp control switch in the utility model.
The electrical schematic diagram of Fig. 5 the utility model embodiment 1.
The electrical schematic diagram of Fig. 6 the utility model embodiment 2.
The electrical schematic diagram of Fig. 7 the utility model embodiment 3.
Embodiment
As Fig. 1, Fig. 2, shown in Figure 3, the utility model comprises power module 2, light-emitting diode group 3 and temp control switch 1, its circuit can have multiple choices as required during concrete the application, and temp control switch 1 is connected the input (see figure 1) of power module 2 as described; Or described temp control switch 1 is connected (see figure 2) between the input of the output of power module 2 and light-emitting diode group 3; It can also be the middle (see figure 3) that described temp control switch 1 is connected on light-emitting diode group 3.
As shown in Figure 4, temp control switch 1 described in the utility model has shell 1-1, the bi-metal plate 1-3 of arch is housed in it, be pressed with ceramics insulator 1-2 above the shell, at the center of ceramics insulator embedding one ceramic conversion pin 1-4, bi-metal plate is pushed down in its bottom, prop up horizontally disposed contact arm 1-5 above, the bottom welding of described contact arm one end and a terminal 1-7, the other end is connected with another terminal 1-7 bottom by contact 1-6, and described two-terminal is connected with shell by glass roof 1-8.When temperature changed, bi-metal plate 1-3 can raise or descend according to principle of expanding with heat and contracting with cold, thereby drove terminal 1-7 and move up and down by ceramic conversion pin 1-4, contact arm 1-5, contact 1-6, and circuit is switched on or switched off.
Below by specific embodiment the utility model is further described:
As shown in Figure 5, this routine described power module 2 comprises by bridge rectifier B
1, capacitor C
2, C
3, inductance L
1The current rectifying and wave filtering circuit that constitutes, buffer circuit D
1, D
2, transformer T
1, special constant-current chip for driving IC
1, optocoupler U
1, by resistance R
7, R
8With triode Q
1The sample circuit that constitutes.Wherein:
Diode D
1, D
2The buffer circuit that connects formation relatively can protect the crest voltage of reflected voltage and leakage inductance generation effectively, and the positive pole of D2 connects transformer T
1Main coil, diode D
4Meet transformer T
1Ancillary coil, diode D
5Meet transformer T
1Secondary coil.
Special constant-current chip for driving IC
1(model: VIP22) be the product of a single encapsulation, a special-purpose current type PWM controller and a high-voltage power field effect MOS transistor on same chip, have been integrated, this chip is for using special optimal design at 10W in the power supply of interior secondary power output, VIP22 can be used with optical coupler, current/voltage is carried out precision regulate; VIP22 adopts integrated current type PWM controller, and is fast to the response speed of secondary voltage transition, guarantees that when the output loop transition output voltage changes less than 5%, and this chip is specially adapted to the current stabilization mode and exports.IC
14 pin Vdd power supplys take from auxiliary transformer winding and diode D
4-capacitor C
4Circuit, IC
1Pin 1, pin 2 are source electrodes of metal-oxide-semiconductor in the chip, pin 5, pin 6, pin 7, pin 8 are drain electrodes of metal-oxide-semiconductor, pin 3 is feedback pin FB.During driving work, Vdd pin just pin 4 is accepted from the next signal of ancillary coil, C
8Strobe, the whole start-up time that is present between input voltage and the output voltage is significantly few, and feedback pin FB limits electric current, even output voltage changes, the feature of output current also can be kept.
Among Fig. 5, D
6Be the Zener diode of a stable electrical pressure drop, feedback is an isolated reversal topological structure, and control loop is by an optical coupler U
1(model: realize PC817), carry out the input and output front and back end with optocoupler and isolate that guarantee that input and output insulate fully, the implementation method of this feedback loop is by optical coupler U
1Utilize output current to feed back to IC
1Pin 3.
R
7, R
8Be sampling resistor, Q
1For the sampling triode, make entire circuit present NTC characteristic, Q
1Be heated, electric current output reduces, and guarantees that LED is not damaged.
In this example, electric main is input to power module 2 by temp control switch 1, and the direct current of power module output provides the galvanic current source for light-emitting diode group 3.
As shown in Figure 6, this routine circuit structure is basic identical with example 1, difference only is that the input of temp control switch 1 is connected the output of power module 2, the two ends of capacitor C 6 just, and the output of temp control switch 1 is connected the two ends of light-emitting diode group 3.Detailed circuit is repeated description no longer.
As shown in Figure 7, this routine circuit structure is same and example 1 is basic identical, and difference is that temp control switch 1 is connected the centre of light-emitting diode group 3.Detailed circuit is repeated description no longer.
Claims (6)
1, a kind of light-emitting diode overheating protection circuit contains power module (2) and light-emitting diode group (3), it is characterized in that: also be provided with temp control switch (1) in the described circuit.
2, light-emitting diode overheating protection circuit according to claim 1 is characterized in that: described temp control switch (1) is connected the input of power module (2).
3, light-emitting diode overheating protection circuit according to claim 1 is characterized in that: described temp control switch (1) is connected between the input of the output of power module (2) and light-emitting diode group (3).
4, light-emitting diode overheating protection circuit according to claim 1 is characterized in that: described temp control switch (1) is connected on the centre of light-emitting diode group (3).
5; according to claim 1 or 2 or 3 or 4 described light-emitting diode overheating protection circuits; it is characterized in that: described temp control switch (1) has shell (1-1); the bi-metal plate (1-3) of arch is housed in it; be pressed with ceramics insulator (1-2) above the shell; at the center of ceramics insulator embedding one ceramic conversion pin (1-4); bi-metal plate is pushed down in its bottom; prop up horizontally disposed contact arm (1-5) above; described contact arm one end is fixedlyed connected with the bottom of a terminal (1-7); the other end is connected with another terminal (1-7) bottom by contact (1-6), and described two-terminal is by glass roof (1-8) constraint location.
6, according to claim 1 or 2 or 3 or 4 described light-emitting diode overheating protection circuits, it is characterized in that: described power module (2) comprises by bridge rectifier B
1, capacitor C
2, C
3, inductance L
1The current rectifying and wave filtering circuit that constitutes, buffer circuit D
1, D
2, transformer T
1, special constant-current chip for driving IC
1, optocoupler U
1, by resistance R
7, R
8With triode Q
1The sample circuit that constitutes; Wherein: diode D
1, D
2Connect transformer T
1Main coil, diode D
4Meet transformer T
1Ancillary coil, diode D
5Meet transformer T
1Secondary coil; Special constant-current chip for driving IC
14 pin Vdd power supplys take from auxiliary transformer winding and diode-capacitor circuit, IC
1Pin 1, pin 2 are source electrodes of metal-oxide-semiconductor in the chip, pin 5, pin 6, pin 7, pin 8 are drain electrodes of metal-oxide-semiconductor, pin 3 is feedback pin FB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201141498U CN201114899Y (en) | 2007-08-30 | 2007-08-30 | LED over-heat protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201141498U CN201114899Y (en) | 2007-08-30 | 2007-08-30 | LED over-heat protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201114899Y true CN201114899Y (en) | 2008-09-10 |
Family
ID=39966650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201141498U Expired - Lifetime CN201114899Y (en) | 2007-08-30 | 2007-08-30 | LED over-heat protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201114899Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102287725A (en) * | 2011-07-27 | 2011-12-21 | 苏州晶雷光电照明科技有限公司 | Light-emitting diode (LED) recessed lamp with high-temperature protection function |
| CN102563391A (en) * | 2010-12-22 | 2012-07-11 | 深圳市长运通光电技术有限公司 | Led light source |
| CN107795968A (en) * | 2017-11-23 | 2018-03-13 | 江门黑氪光电科技有限公司 | A kind of high-voltage LED light bar with overload protection function |
-
2007
- 2007-08-30 CN CNU2007201141498U patent/CN201114899Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102563391A (en) * | 2010-12-22 | 2012-07-11 | 深圳市长运通光电技术有限公司 | Led light source |
| CN102287725A (en) * | 2011-07-27 | 2011-12-21 | 苏州晶雷光电照明科技有限公司 | Light-emitting diode (LED) recessed lamp with high-temperature protection function |
| CN107795968A (en) * | 2017-11-23 | 2018-03-13 | 江门黑氪光电科技有限公司 | A kind of high-voltage LED light bar with overload protection function |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20080910 |
|
| CX01 | Expiry of patent term |