CN204859711U - LED constant temperature drive circuit - Google Patents
LED constant temperature drive circuit Download PDFInfo
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- CN204859711U CN204859711U CN201520655464.6U CN201520655464U CN204859711U CN 204859711 U CN204859711 U CN 204859711U CN 201520655464 U CN201520655464 U CN 201520655464U CN 204859711 U CN204859711 U CN 204859711U
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Abstract
The utility model relates to a LED constant temperature drive circuit belongs to the electricity field, for LED lamp constant temperature problem among the solution prior art. It include switching power supply and with the temperature -sensing circuit of switching power supply control circuit input connection, the temperature -sensing circuit mainly includes temperature -sensing ware and the voltage stabilizing circuit of input connection in the output of temperature -sensing ware. The utility model discloses a heat that the temperature -sensing ware was sensed changes self resistance, arouses that voltage stabilizing circuit's output voltage changes to control circuit's among the adjustment switching power supply operating voltage, and then change the electric current in switching power supply output voltage and the load, finally reduced the temperature of whole LED lamp.
Description
Technical field
The utility model belongs to electricity field, specifically relates to a kind of LED constant temperature drive circuit.
Background technology
Light-emitting diode is a kind of semiconductor subassembly, be called for short LED, be called as forth generation lighting source or green light source, there is the features such as energy-saving and environmental protection, the life-span is long, volume is little, be widely used in the fields such as various instruction, display, decoration, backlight, general lighting and urban landscape.LED lamp is in the market more closed, during LED work, its internal drive circuits and LED itself all can produce a large amount of heats, and then affect the useful life of LED, in order to solve LED heat dissipation problem, existing is that LED light fixture adopts the good material of various heat dispersion to make, or directly on light fitting body, offers various louvre and dispel the heat.
But also do not provide the heat produced during a can work to LED by LED lamp drive circuit to lower the temperature in prior art.
Utility model content
The purpose of this utility model is to overcome deficiency of the prior art, provides the LED constant temperature drive circuit that the heat produced during a kind of can work to LED by drive circuit self is lowered the temperature.
For achieving the above object, the utility model provides a kind of LED constant temperature drive circuit, the temperature sense circuit that it comprises switching power supply and is connected with described switching power supply control circuit input;
Described temperature sense main circuit will comprise temperature inductor and input and be connected to the voltage stabilizing circuit that temperature inductor exports.The heat produced during the work of temperature inductor induction LED, self resistance is changed by the heat sensed, the output voltage of voltage stabilizing circuit is caused to change, thus the operating voltage of control circuit in adjustment switching power supply, and then the electric current changed in switching power supply output voltage and load, eventually reduce the temperature of whole LED.
The too low or too high for voltage of the output of switching power supply is caused in order to avoid because temperature inductor output voltage is too high or too low, cause LED normally cannot work or be in the situation exceeding rated operational voltage work, the voltage stabilizing circuit that the utility model adopts mainly comprises resistance R2, resistance R3 and voltage-stabiliser tube ZD, described resistance R2 and resistance R3 connects, the other end of described resistance R2 is connected with the negative electrode of described voltage stabilizing didoe ZD, the negative electrode of described voltage stabilizing didoe ZD is also connected to the input of described control circuit, the anode of described voltage stabilizing didoe ZD is connected altogether with the other end of described resistance R3, described temperature inductor be connected between described resistance R2 and described resistance R3, the output of temperature inductor is also connected to the negative electrode of described voltage stabilizing didoe ZD.Achieve the stable of temperature sense circuit output voltage by the effect of voltage stabilizing didoe, further achieve the voltage stabilizing of switching power supply output voltage; Meanwhile, constant temperature is also achieved by the effect of voltage stabilizing didoe.
Accompanying drawing explanation
Fig. 1 is theory diagram of the present utility model;
Fig. 2 is a kind of physical circuit schematic diagram of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail.
With reference to Fig. 1, the utility model provides a kind of LED constant temperature drive circuit, and it comprises:
Switching power supply, mainly comprise input connect power supply EMI rectifier, input be connected to EMI rectifier output end input rectifying filter circuit, input be connected to input rectifying filter circuit export transformer T, input be connected to transformer T output rectifier and filter and one end input be connected to described output rectifier and filter export control circuit; The output of control circuit is connected to described transformer, and the output of output rectifier and filter connects load (LED light emitting source) as the output of switching power supply;
Described temperature sense main circuit will comprise temperature inductor and input and be connected to the voltage stabilizing circuit that temperature inductor exports; The output of voltage stabilizing circuit is connected to the other end input of described control circuit.
Operation principle of the present utility model: after switching on power, switching power supply output is that load (LED light emitting source) provides corresponding direct-current working volts, LED and whole drive circuit operationally produce heat, along with continuing of operating time, the heat produced gets more and more, and causes the temperature in lamp body also more and more higher; Now temperature inductor sense by sense temperature change self resistance (temperature rise or decline, its resistance increases or reduces), because temperature inductor is in succession on voltage stabilizing circuit, its change in resistance then can cause the output voltage of voltage stabilizing circuit to change (during temperature rise/fall, resistance on temperature inductor increases/reduces, the output voltage of voltage stabilizing circuit just increases/reduces), the voltage input levels control circuit of change, thus the output duty cycle of control transformer.Further illustrate, when temperature is raised, stabilized circuit outputting voltage increases, the duty ratio that transformer exports reduces, thus output voltage is reduced, be connected to the electric current also corresponding reduction in the load of switching power supply output, because heat and electric current meet following relation simultaneously:
Q＝I
2RT(1)
From (1) formula, when the electric current in load reduces, the heat produced also can correspondingly reduce, thus achieves cooling.
In order to further make drive circuit provided by the utility model reach constant temperature and pressure stabilization function, further improvement of the utility model is:
With reference to Fig. 2, voltage stabilizing circuit described in the utility model comprises resistance R2, resistance R3 and voltage stabilizing didoe ZD, described resistance R2 and resistance R3 connects, the other end of described resistance R2 is connected with the negative electrode of described voltage stabilizing didoe ZD, the negative electrode of described voltage stabilizing didoe ZD is also connected to the other end input of described control circuit, and the anode of described voltage stabilizing didoe ZD is connected altogether with the other end of described resistance R3; Described temperature inductor be connected between described resistance R2 and described resistance R3; The output of temperature inductor is also connected to the negative electrode of described voltage stabilizing didoe ZD.The negative electrode of described voltage stabilizing didoe ZD is as the output of voltage stabilizing circuit.
The voltage inputed in photoelectrical coupler can be limited by voltage stabilizing didoe ZD, Yin Wendu can be avoided too high and voltage that is that cause switching power supply to export is too small and cause the situation that LED cannot work, thus both achieve constant temperature, achieve voltage stabilizing again.
In actual use, described switching power supply can adopt existing any one circuit topological structure, as switching power supply can adopt auto-excitation type former limit feedback switch stabilized voltage power supply, also can adopt independent-excited former limit feedback switch stabilized voltage power supply.
There is provided herein a kind of concrete switching power supply topological structure, please refer to Fig. 2.
As shown in Figure 2, provide a kind of concrete switching power supply topological structure without EMI rectifier, comprise primarily of input connect power supply rectifier D1 and be connected to rectifier D1 output for make the voltage after rectification milder filter capacitor C1 form input rectifying filter circuit, the start-up circuit that resistance R1 that rectifier D1 positive pole exports and the switching tube Q that electric capacity C2 and collector electrode are connected to resistance R1 and the electric capacity C2 other end simultaneously forms is connected to primarily of one end, armature winding is connected in parallel on the transformer T at electric capacity C2 two ends, be connected to exporting primarily of anode and transformer T secondary winding positive pole the rectifier diode D2 that is connected and being connected to the output rectifier and filter formed for the filter capacitor C3 of filtering of rectifier diode D2 negative electrode on transformer T secondary winding, be connected to the photoelectrical coupler of described rectifier diode D2 negative electrode and negative electrode primarily of one end input and be connected to the control circuit that diode D3 that described photoelectrical coupler one end exports forms, the two ends of photoelectrical coupler input the input respectively as control circuit, the negative electrode of diode D3 is also by electric capacity C4 ground connection, and the auxiliary winding switching of transformer T is between the anode and ground of diode D3, the other end input of photoelectrical coupler connects the negative electrode of voltage stabilizing didoe ZD, and the other end of photoelectrical coupler exports the base stage being connected to triode Q, the grounded emitter of triode Q.Load (LED light emitting source) can adopt the mode of series connection or parallel connection to be connected to the output of switching power supply, but preferably adopts the series-parallel mode of LED to connect; Because the output voltage of switching power supply can be lowered after LED parallel connection, the number of turn of the transformer secondary output winding in switching power supply is reduced, and then reduces the volume of whole switching power supply.
The specific works principle of the switching power supply topological structure that the utility model provides is: power supply (civil power) is through the armature winding of input rectifying filter circuit input resistance R1, electric capacity C2 and transformer T, armature winding due to resistance R1, electric capacity C2 and transformer T forms a resonant circuit, when certain frequency section, voltage, this circuit resistance is minimum, then maximum by the electric current of transformer T armature winding, generation magnetic field is the strongest.The auxiliary winding of transformer T is subject to the induction in magnetic field, produces voltage, through diode D3 and electric capacity C4 rectifying and wave-filtering, and by the base stage of optocoupler to triode Q, for triode Q provides corresponding operating voltage at winding two ends.The secondary winding of transformer T then can be made after triode Q conducting to produce voltage, thus provide operating voltage for load.
The utility model is not limited to above-mentioned preferred forms; anyone can draw other various forms of products under enlightenment of the present utility model; no matter but any change is done in its shape or structure; every have identical with the application or akin technical scheme, all drops within protection range of the present utility model.
Claims (5)
1. a LED constant temperature drive circuit, is characterized in that: the temperature sense circuit that it comprises switching power supply and is connected with described switching power supply control circuit input;
Described temperature sense main circuit will comprise temperature inductor and input and be connected to the voltage stabilizing circuit that temperature inductor exports.
2. LED constant temperature drive circuit according to claim 1, it is characterized in that: described voltage stabilizing circuit mainly comprises resistance R2, resistance R3 and voltage-stabiliser tube ZD, described resistance R2 and resistance R3 connects, the other end of described resistance R2 is connected with the negative electrode of described voltage stabilizing didoe ZD, the negative electrode of described voltage stabilizing didoe ZD is also connected to the input of described control circuit, and the anode of described voltage stabilizing didoe ZD is connected altogether with the other end of described resistance R3; Described temperature inductor be connected between described resistance R2 and described resistance R3; The output of temperature inductor is also connected to the negative electrode of described voltage stabilizing didoe ZD.
3. LED constant temperature drive circuit according to claim 1 and 2, is characterized in that: described temperature inductor is thermocouple temperature sensor.
4. LED constant temperature drive circuit according to claim 1 and 2, it is characterized in that: described switching power supply comprises the input rectifying filter circuit that the rectifier D1 connecting power supply by input is formed with the filter capacitor C1 being connected to rectifier D1 output, the start-up circuit that resistance R1 that rectifier D1 positive pole exports and the switching tube Q that electric capacity C2 and collector electrode are connected to resistance R1 and the electric capacity C2 other end simultaneously forms is connected to primarily of one end, armature winding is connected in parallel on the transformer T at electric capacity C2 two ends, be connected to and transformer T secondary winding exports primarily of anode and transformer T secondary winding positive pole the output rectifier and filter that the rectifier diode D2 be connected and the filter capacitor C3 being connected to rectifier diode D2 negative electrode form, be connected to the photoelectrical coupler of described rectifier diode D2 negative electrode and negative electrode primarily of one end input and be connected to the control circuit that diode D3 that described photoelectrical coupler one end exports forms, the negative electrode of diode D3 is also by electric capacity C4 ground connection, and the auxiliary winding switching of transformer T is between the anode and ground of diode D3, the other end input of photoelectrical coupler connects the output of voltage stabilizing circuit, and the other end of photoelectrical coupler exports the base stage being connected to triode Q, the grounded emitter of triode Q.
5. LED constant temperature drive circuit according to claim 3, it is characterized in that: described switching power supply comprises the input rectifying filter circuit that the rectifier D1 connecting power supply by input is formed with the filter capacitor C1 being connected to rectifier D1 output, the start-up circuit that resistance R1 that rectifier D1 positive pole exports and the switching tube Q that electric capacity C2 and collector electrode are connected to resistance R1 and the electric capacity C2 other end simultaneously forms is connected to primarily of one end, armature winding is connected in parallel on the transformer T at electric capacity C2 two ends, be connected to and transformer T secondary winding exports primarily of anode and transformer T secondary winding positive pole the output rectifier and filter that the rectifier diode D2 be connected and the filter capacitor C3 being connected to rectifier diode D2 negative electrode form, be connected to the photoelectrical coupler of described rectifier diode D2 negative electrode and negative electrode primarily of one end input and be connected to the control circuit that diode D3 that described photoelectrical coupler one end exports forms, the negative electrode of diode D3 is also by electric capacity C4 ground connection, and the auxiliary winding switching of transformer T is between the anode and ground of diode D3, the other end input of photoelectrical coupler connects the output of voltage stabilizing circuit, and the other end of photoelectrical coupler exports the base stage being connected to triode Q, the grounded emitter of triode Q.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520655464.6U CN204859711U (en) | 2015-08-27 | 2015-08-27 | LED constant temperature drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520655464.6U CN204859711U (en) | 2015-08-27 | 2015-08-27 | LED constant temperature drive circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204859711U true CN204859711U (en) | 2015-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520655464.6U Expired - Fee Related CN204859711U (en) | 2015-08-27 | 2015-08-27 | LED constant temperature drive circuit |
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| CN (1) | CN204859711U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106102259A (en) * | 2016-08-18 | 2016-11-09 | 张银月 | A kind of LED overheat step-down circuit |
| CN106793312A (en) * | 2016-12-29 | 2017-05-31 | 伊戈尔电气股份有限公司 | A kind of H bridges switch colour temperature circuit |
-
2015
- 2015-08-27 CN CN201520655464.6U patent/CN204859711U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106102259A (en) * | 2016-08-18 | 2016-11-09 | 张银月 | A kind of LED overheat step-down circuit |
| CN106793312A (en) * | 2016-12-29 | 2017-05-31 | 伊戈尔电气股份有限公司 | A kind of H bridges switch colour temperature circuit |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151209 Termination date: 20180827 |