CN204598365U - A kind of LED illumination device and LED lamp power driving circuit - Google Patents
A kind of LED illumination device and LED lamp power driving circuit Download PDFInfo
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- CN204598365U CN204598365U CN201520134336.7U CN201520134336U CN204598365U CN 204598365 U CN204598365 U CN 204598365U CN 201520134336 U CN201520134336 U CN 201520134336U CN 204598365 U CN204598365 U CN 204598365U
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Abstract
The utility model discloses a kind of LED illumination device and LED lamp power driving circuit, this drive circuit comprises: rectification filtering unit, for alternating current being carried out rectification and filtering to export the first direct voltage; Constant voltage source unit, for being converted to the second direct voltage by the exported by rectification filtering unit first direct voltage and exporting constant voltage; Constant current driving unit, the constant voltage for being exported by constant voltage source unit carries out constant current conversion to export constant current to LED light source; With light modulation toning control unit, for regulating brightness and the changes in temperature of LED light source by exporting the first pulse-width signal and the second pulse-width signal, wherein this constant voltage source unit is isolated form, and this constant current driving unit is non-isolation type.
Description
Technical field
The utility model relates to a kind of LED illumination device, more specifically, relates to a kind of drive circuit of LED lamp power supply.
Background technology
LED (Light Emitting Diode, light-emitting diode) light fixture replaces rapidly traditional incandescent lamp.Compared with incandescent lamp, LED has the advantages such as the high and low power consumption of luminous efficiency, adjustable color temperature, life-span length.In all parts of LED lamp, the design of power supply and drive circuit is most important.Because the light characteristic of LED is directly related with electric current, therefore LED adopts constant current to drive usually, to ensure, to the accurate adjustment of LED luminance, colourity, to avoid drive current off-rating, affect reliability and life-span simultaneously.
Such as publication number is that the patent of invention file of CN101572972 discloses a kind of tunable optical constant-current source circuit, comprises EMC protection circuit, PFC correcting circuit, constant-current source circuit and adjusting control circuit.Wherein the input of EMC protection circuit receives external AC 220V input, output is connected to PFC correcting circuit, constant voltage signal is exported to constant-current source circuit and adjusting control circuit by PFC correcting circuit, outside light fixture is driven by constant-current source output, the output output pulse width modulation signal of adjusting control circuit drives constant-current source, to reach light modulation object.Output and the input of such circuit constant-current source do not have electrical isolation, and this situation requires that lamp outer casing itself has good electrical isolation, can ensure safety.Therefore, this LED lamp of not isolating is used in commercial illumination and street lamp usually, namely only has the occasion that the electrician of professional training just can contact.In addition, if the output of constant-current source and input adopt switching mode power supply transformer to realize electrical isolation, in this case, the operating frequency of Switching Power Supply is generally 20kHz ~ 70kHz, the response of such operating frequency to pulse-width signal (being generally 500Hz ~ 1kHz) is sensitive not, and namely light fixture cannot be adjusted to lower brightness.In common realization, when the duty ratio of pulse-width signal is less than about 10%, light fixture will directly extinguish.
To sum up, the effect that this single-stage constant current drives is unsatisfactory, especially for the LED lamp that power is larger.
Therefore, the power supply needing performance more stable and drive circuit design, and the adjusting control circuit that cost is lower.
Utility model content
For this reason, the utility model provides a kind of LED illumination device and drive circuit, to try hard to solve or at least alleviate at least one problem existed above.
According to an aspect of the present utility model, a kind of LED lamp power driving circuit is provided, comprises: rectification filtering unit, for alternating current being carried out rectification and filtering to export the first direct voltage; Constant voltage source unit, for being converted to the second direct voltage by the exported by rectification filtering unit first direct voltage and exporting constant voltage; Constant current driving unit, the constant voltage for being exported by constant voltage source unit carries out constant current conversion to export constant current to LED light source; With light modulation toning control unit, for regulating brightness and the changes in temperature of LED light source by exporting the first pulse-width signal and the second pulse-width signal, wherein constant voltage source unit is isolated form, and constant current driving unit is non-isolation type.
Alternatively, according in LED lamp power driving circuit of the present utility model, constant voltage source unit comprises the isolated part for electrical isolation.
Alternatively, according in LED lamp power driving circuit of the present utility model, also comprise: changes in temperature light switch unit, for regulating the cold and warm tone of LED light source, wherein the first pulse-width signal is output to constant current driving unit, and the second pulse-width signal is output to changes in temperature light switch unit.
Alternatively, according in LED lamp power driving circuit of the present utility model, LED light source comprises at least the first group LED and second group of LED with different-colour, this changes in temperature light switch unit comprises: the first switching device (Q1), and the first series arm of first group of LED is connected between the first output of constant current driving unit and the second output; Second switch device (Q2), and the second series arm of second group of LED is connected between the first output of constant current driving unit and the second output; First dividing potential drop branch road, comprises first resistance (R1) of series connection, the second resistance (R2) and the 3rd resistance (R3); 3rd switching device (Q3), the 3rd series arm of itself and dividing potential drop branch road is connected between the first output of constant current driving unit and earth terminal; Second dividing potential drop branch road, comprises and is connected on the 4th resistance (R4) between the first output of constant current driving unit and the second output and the 5th resistance (R5); With the 4th switching device (Q4), it is in parallel with the 4th resistance (R4), wherein the gating termination of the 3rd switching device receives the second pulse-width signal from light modulation toning control unit, wherein the gating end of the first switching device (Q1) is connected between the second resistance (R2) and the 3rd resistance (R3), the gating end of second switch device (Q2) is connected between the 4th resistance (R4) and the 5th resistance (R5), and the gating end of the 4th switching device (Q4) is connected between the first resistance (R1) and the second resistance (R2).
Alternatively, according in LED lamp power driving circuit of the present utility model, 3rd switching device comprises NPN type triode, the gating end of the 3rd switching device is base stage, base stage receives the second pulse-width signal via the 6th resistance (R6) and is connected to earth terminal via the 7th resistance (R7), the collector electrode of the 3rd switching device is connected to the 3rd resistance (R3), and emitter is connected to earth terminal.
Alternatively, according in LED lamp power driving circuit of the present utility model, 4th switching device comprises PNP type triode, the gating end of the 4th switching device is base stage, the emitter of the 4th switching device is connected to the first output of constant current driving unit, and the collector electrode of the 4th switching device is connected between the 4th resistance (R4) and the 5th resistance (R5).
Alternatively, according in LED lamp power driving circuit of the present utility model, first switching device comprises PMOS, the gating end of the first switching device is grid, the drain electrode of the first switching device is connected with first group of LED, and the source electrode of the first switching device is connected to the first output of constant current driving unit.
Alternatively, according in LED lamp power driving circuit of the present utility model, second switch device comprises PMOS, the gating end of second switch device is grid, the drain electrode of second switch device is connected with second group of LED, and the source electrode of second switch device is connected to the first output of constant current driving unit.
Alternatively, according in LED lamp power driving circuit of the present utility model, also comprise EMI filter unit, for the electromagnetic interference suppressing electrical network and electronic component self to produce.
Alternatively, according in LED lamp power driving circuit of the present utility model, constant current driving unit operating frequency range is 600kHz to 1000kHz.
According to another aspect of the present utility model, provide a kind of LED illumination device, comprise LED lamp power driving circuit as above and LED light source.
According to LED lamp power driving circuit scheme of the present utility model, have employed constant pressure and flow the two poles of the earth and drive, constant voltage Switching Power Supply achieves circuit output and mains isolation by transformer on the one hand, thus guarantees the fail safe of circuit; On the other hand because constant current driving unit adopts low pressure non-isolated structure, operating frequency, far above light modulation pulse-width signal, therefore can realize the very high brightness regulation of precision, and lower than the steady illumination under the low illumination conditions of 5% rated power.
In addition, according to LED lamp power driving circuit scheme of the present utility model, have employed the changes in temperature commutation circuit utilizing single constant current driving unit to realize, not only save cost, and because constant-current supply output current single when adjustment of cold/warm is stablized constant, therefore, during adjustment of cold/warm, the luminosity of whole light fixture can not change.
To sum up, the utility model can provide the LED power and drive circuit design that performance is more stable, and the adjusting control circuit that cost is lower.
Accompanying drawing explanation
In order to realize above-mentioned and relevant object; combine description below and accompanying drawing herein to describe some illustrative aspect; these aspects indicate the various modes can putting into practice principle disclosed herein, and all aspects and equivalent aspect thereof are intended to fall in the scope of theme required for protection.Read detailed description below in conjunction with the drawings, above-mentioned and other object of the present disclosure, Characteristics and advantages will become more obvious.Throughout the disclosure, identical Reference numeral is often referred to for identical parts or element.
Fig. 1 shows the structure chart of the LED lamp power driving circuit 100 according to an illustrative embodiments of the present utility model;
Fig. 2 shows the circuit diagram of the changes in temperature light switch unit 150 of the LED lamp power driving circuit 100 according to an illustrative embodiments of the present utility model.
Embodiment
Below with reference to accompanying drawings exemplary embodiment of the present disclosure is described in more detail.Although show exemplary embodiment of the present disclosure in accompanying drawing, however should be appreciated that can realize the disclosure in a variety of manners and not should limit by the embodiment set forth here.On the contrary, provide these embodiments to be in order to more thoroughly the disclosure can be understood, and complete for the scope of the present disclosure can be conveyed to those skilled in the art.
Fig. 1 is the structural representation of the LED lamp power driving circuit 100 according to an embodiment of the present utility model.The drive circuit of this LED lamp power supply comprises: rectification filtering unit 110, constant voltage source unit 120, constant current driving unit 130 and light modulation toning control unit 140.
Alternating current is carried out rectification and filtering to export the first direct voltage by rectification filtering unit 110, and such as, for the situation of 220V civil power input, the output after rectifying and wave-filtering is no more than the direct current of 400V.The first voltage dc exported by rectification filtering unit 110 is converted to the second voltage dc and stable output voltage by constant voltage source unit 120, wherein constant voltage source unit 120 comprises the isolated part for electrical isolation, according to an execution mode of the present utility model, constant voltage source unit 120 is made up of constant voltage Switching Power Supply and transformer, high voltage direct current (being such as no more than the direct current of 400V) is converted to 24V low-voltage DC by constant voltage Switching Power Supply, and keeps the stable of output voltage.Wherein the operating frequency of constant voltage Switching Power Supply is 20kHz to 70kHz.Constant voltage Switching Power Supply achieves the isolation of output stage and input stage (civil power) by transformer, thus ensures the fail safe of its follow-up all circuit.Constant current driving unit 130 is connected with constant voltage source unit 120, the constant voltage exported by constant voltage source unit 120 carries out constant current conversion to export constant current to LED light source, according to an embodiment of the present utility model, this constant current remains on 250mA to 300mA, and the operating frequency range of constant current driving unit 130 is 600kHz to 1000kHz.It should be noted that this constant voltage source unit 120 is isolated form, constant current driving unit 130 is non-isolation type.In addition, light modulation toning control unit 140 exports two-way pulse-width signal, is used for respectively regulating the brightness of LED light source and changes in temperature.
According to an embodiment of the present utility model, this drive circuit 100 also comprises changes in temperature light switch unit 150, for regulating the cold and warm tone of LED light source.Namely in above-mentioned two-way pulse-width signal, first pulse-width signal is output to constant current driving unit 130 to regulate the brightness of light, second pulse-width signal is output to changes in temperature light switch unit 150 to regulate the cold and warm tone of light, exports to LED then by changes in temperature light switch unit 150.
Wherein, LED light source comprises at least the first group LED and second group of LED with different-colour.
According to an embodiment of the present utility model, this drive circuit 100 also comprises EMI filter unit 160, its input receives the input of external power source AV220V, for the electromagnetic interference suppressing electrical network and electronic component self to produce, then alternating current is exported to rectification filtering unit 110.
According to constant pressure and flow two-stage drive circuit of the present utility model, achieve circuit by constant voltage source unit and export and mains isolation, ensured the fail safe of circuit; Non-isolated constant current driving unit is with the frequency adjustment pulse-width signal (being generally 1kHz) of 600kHz to 1000kHz simultaneously, can realize the brightness regulation that precision is very high, and brightness is lower than the low-light level output of less than 5%.
Fig. 2 shows the circuit diagram of the changes in temperature light switch unit 150 according to an embodiment of the present utility model.Changes in temperature light switch unit 150 comprises: the first switching device Q1, is connected between the first output of constant current driving unit and the second output with the first series arm of first group of LED (LED_P1, LED_N); Second switch device Q2, is connected between the first output of constant current driving unit and the second output with the second series arm of second group of LED (LED_P2, LED_N); First dividing potential drop branch road, comprises the first resistance R1 of series connection, the second resistance R2 and the 3rd resistance R3; 3rd switching device Q3, the 3rd series arm of itself and dividing potential drop branch road is connected between the first output of constant current driving unit and earth terminal GND; Second dividing potential drop branch road, comprises and is connected on the 4th resistance R4 between the first output of constant current driving unit and the second output and the 5th resistance R5; With the 4th switching device Q4, it is in parallel with the 4th resistance R4.
Wherein the gating termination of the 3rd switching device receives the second pulse-width signal from light modulation toning control unit 140, i.e. changes in temperature switching signal, wherein the gating end of the first switching device Q1 is connected between the second resistance R2 and the 3rd resistance R3, the gating end of second switch device Q2 is connected between the 4th resistance R4 and the 5th resistance R5, and the gating end of the 4th switching device Q4 is connected between the first resistance R1 and the second resistance R2.
More specifically, 3rd switching device comprises NPN type triode Q3, the gating end of the 3rd switching device is base stage, base stage receives the second pulse-width signal via the 6th resistance R6 and is connected to earth terminal via the 7th resistance R7, its collector electrode is connected to the 3rd resistance R3, and emitter is connected to earth terminal.
4th switching device comprises PNP type triode Q4, and the gating end of the 4th switching device is base stage, and its emitter is connected to the first output of constant current driving unit, and collector electrode is connected between the 4th resistance R4 and the 5th resistance R5.
First switching device comprises PMOS Q1, and the gating end of this first switching device is grid, and its drain electrode is connected with first group of LED, and source electrode is connected to the first output of constant current driving unit.
Second switch device comprises PMOS Q2, and the gating end of this second switch device is grid, and its drain electrode is connected with second group of LED, and source electrode is connected to the first output of constant current driving unit.
When changes in temperature signal is input as high level, NPN type triode Q3 conducting, the first dividing potential drop branch road has electric current to pass through, PMOS Q1 and PNP type triode Q4 conducting, so the 4th resistance R4 is shorted, PMOS Q2 ends.Now first group of LED has electric current to pass through, this LED is lighted, and in like manner, second group of LED is extinguished.
Correspondingly, when changes in temperature signal is input as low level, NPN type triode Q3 ends, so no current passes through on the first dividing potential drop branch road, thus PMOS Q1 and PNP type triode Q4 all ends, and the second dividing potential drop branch road has electric current to pass through, therefore PMOS Q2 conducting.In like manner, now second group of LED luminescent device is lighted, and first group of LED is extinguished.
Due in actual applications, two paths of LED luminescent device does not need to light simultaneously, therefore according to changes in temperature light commutation circuit of the present utility model, can use single constant current driving unit, and not need two or more constant current unit.Not only saved cost, and when adjustment of cold/warm, single constant-current supply output current is stablized, and therefore adjustment of cold/warm can not change the luminosity of whole light fixture constant.
Be to be understood that, in order to simplify the disclosure and to help to understand in each utility model aspect one or more, in the description above to exemplary embodiment of the present utility model, each feature of the present utility model is grouped together in single embodiment, figure or the description to it sometimes.But, the method for the disclosure should be construed to the following intention of reflection: namely the utility model required for protection requires than the feature more multiple features clearly recorded in each claim.Or rather, as claims below reflect, all features of disclosed single embodiment before utility model aspect is to be less than.Therefore, the claims following embodiment are incorporated to this embodiment thus clearly, and wherein each claim itself is as independent embodiment of the present utility model.
Those skilled in the art are to be understood that the module of the equipment in example disclosed herein or unit or assembly can be arranged in equipment as depicted in this embodiment, or alternatively can be positioned in one or more equipment different from the equipment in this example.Module in aforementioned exemplary can be combined as a module or can be divided into multiple submodule in addition.
Those skilled in the art are appreciated that and adaptively can change the module in the equipment in embodiment and they are arranged in one or more equipment different from this embodiment.Module in embodiment or unit or assembly can be combined into a module or unit or assembly, and multiple submodule or subelement or sub-component can be put them in addition.Except at least some in such feature and/or process or unit be mutually repel except, any combination can be adopted to combine all processes of all features disclosed in this specification (comprising adjoint claim, summary and accompanying drawing) and so disclosed any method or equipment or unit.Unless expressly stated otherwise, each feature disclosed in this specification (comprising adjoint claim, summary and accompanying drawing) can by providing identical, alternative features that is equivalent or similar object replaces.
A: according to LED lamp power driving circuit of the present utility model, wherein constant current driving unit operating frequency range is 600kHz to 1000kHz.
In addition, those skilled in the art can understand, although embodiments more described herein to comprise in other embodiment some included feature instead of further feature, the combination of the feature of different embodiment means and to be within scope of the present utility model and to form different embodiments.Such as, in the following claims, the one of any of embodiment required for protection can use with arbitrary compound mode.
In addition, some in described embodiment are described as at this can by the processor of computer system or the method implemented by other device performing described function or the combination of method element.Therefore, there is the device of processor formation for implementing the method or method element of the necessary instruction for implementing described method or method element.In addition, the element described herein of device embodiment is the example as lower device: this device is for implementing the function performed by the element of the object in order to implement this utility model.
As used in this, unless specifically stated so, use ordinal number " first ", " second ", " the 3rd " etc. to describe plain objects and only represent the different instances relating to similar object, and be not intended to imply the object be described like this must have the time upper, spatially, sequence aspect or in any other manner to definite sequence.
Although the embodiment according to limited quantity describes the utility model, benefit from description above, those skilled in the art understand, in the scope of the present utility model described thus, it is contemplated that other embodiment.In addition, it should be noted that the language used in this specification is mainly in order to object that is readable and instruction is selected, instead of select to explain or limiting theme of the present utility model.Therefore, when not departing from the scope and spirit of appended claims, many modifications and changes are all apparent for those skilled in the art.For scope of the present utility model, be illustrative to disclosing of doing of the utility model, and nonrestrictive, and scope of the present utility model is defined by the appended claims.
Claims (11)
1. a LED lamp power driving circuit, is characterized in that, comprising:
Rectification filtering unit, for carrying out rectification and filtering to export the first direct voltage by alternating current;
Constant voltage source unit, for being converted to the second direct voltage by the exported by described rectification filtering unit first direct voltage and exporting constant voltage;
Constant current driving unit, the constant voltage for being exported by constant voltage source unit carries out constant current conversion to export constant current to LED light source; With
Light modulation toning control unit, for regulating brightness and the changes in temperature of LED light source by exporting the first pulse-width signal and the second pulse-width signal,
Wherein said constant voltage source unit is isolated form, and described constant current driving unit is non-isolation type.
2. LED lamp power driving circuit as claimed in claim 1, it is characterized in that, described constant voltage source unit comprises the isolated part for electrical isolation.
3. LED lamp power driving circuit as claimed in claim 1, is characterized in that, also comprise:
Changes in temperature light switch unit, for regulating the cold and warm tone of LED light source,
Wherein said first pulse-width signal is output to described constant current driving unit, and described second pulse-width signal is output to described changes in temperature light switch unit.
4. LED lamp power driving circuit as claimed in claim 3, it is characterized in that, described LED light source comprises at least the first group LED and second group of LED with different-colour, and described changes in temperature light switch unit comprises:
First switching device (Q1), and the first series arm of first group of LED is connected between the first output of described constant current driving unit and the second output;
Second switch device (Q2), and the second series arm of second group of LED is connected between the first output of described constant current driving unit and the second output;
First dividing potential drop branch road, comprises first resistance (R1) of series connection, the second resistance (R2) and the 3rd resistance (R3);
3rd switching device (Q3), the 3rd series arm of itself and dividing potential drop branch road is connected between the first output of described constant current driving unit and earth terminal;
Second dividing potential drop branch road, comprises and is connected on the 4th resistance (R4) between the first output of described constant current driving unit and the second output and the 5th resistance (R5); With
4th switching device (Q4), it is in parallel with the 4th resistance (R4),
Wherein the gating termination of the 3rd switching device receives the second pulse-width signal from described light modulation toning control unit, wherein the gating end of the first switching device (Q1) is connected between the second resistance (R2) and the 3rd resistance (R3), the gating end of second switch device (Q2) is connected between the 4th resistance (R4) and the 5th resistance (R5), and the gating end of the 4th switching device (Q4) is connected between the first resistance (R1) and the second resistance (R2).
5. LED lamp power driving circuit as claimed in claim 4, it is characterized in that, described 3rd switching device comprises NPN type triode, the gating end of described 3rd switching device is base stage, base stage receives the second pulse-width signal via the 6th resistance (R6) and is connected to earth terminal via the 7th resistance (R7), the collector electrode of the 3rd switching device is connected to the 3rd resistance (R3), and emitter is connected to earth terminal.
6. LED lamp power driving circuit as claimed in claim 4, it is characterized in that, described 4th switching device comprises PNP type triode, the gating end of described 4th switching device is base stage, the emitter of the 4th switching device is connected to the first output of constant current driving unit, and the collector electrode of the 4th switching device is connected between the 4th resistance (R4) and the 5th resistance (R5).
7. LED lamp power driving circuit as claimed in claim 4, it is characterized in that, described first switching device comprises PMOS, the gating end of described first switching device is grid, the drain electrode of the first switching device is connected with first group of LED, and the source electrode of the first switching device is connected to the first output of described constant current driving unit.
8. LED lamp power driving circuit as claimed in claim 4, it is characterized in that, described second switch device comprises PMOS, the gating end of described second switch device is grid, the drain electrode of second switch device is connected with second group of LED, and the source electrode of second switch device is connected to the first output of described constant current driving unit.
9. LED lamp power driving circuit as claimed in claim 1, is characterized in that, also comprise EMI filter unit, for the electromagnetic interference suppressing electrical network and electronic component self to produce.
10. LED lamp power driving circuit as claimed in claim 1, it is characterized in that, described constant current driving unit operating frequency range is 600kHz to 1000kHz.
11. 1 kinds of LED illumination device, is characterized in that, comprise the LED lamp power driving circuit according to any one of claim 1-10 and LED light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201520134336.7U CN204598365U (en) | 2015-03-09 | 2015-03-09 | A kind of LED illumination device and LED lamp power driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520134336.7U CN204598365U (en) | 2015-03-09 | 2015-03-09 | A kind of LED illumination device and LED lamp power driving circuit |
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| CN204598365U true CN204598365U (en) | 2015-08-26 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104684219A (en) * | 2015-03-09 | 2015-06-03 | 北京幻腾科技有限公司 | LED lighting device and drive circuit |
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2015
- 2015-03-09 CN CN201520134336.7U patent/CN204598365U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104684219A (en) * | 2015-03-09 | 2015-06-03 | 北京幻腾科技有限公司 | LED lighting device and drive circuit |
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Granted publication date: 20150826 Effective date of abandoning: 20170510 |
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