CN202190441U - Light source driving circuit and ceiling lamp comprising same - Google Patents
Light source driving circuit and ceiling lamp comprising same Download PDFInfo
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- CN202190441U CN202190441U CN2011202794021U CN201120279402U CN202190441U CN 202190441 U CN202190441 U CN 202190441U CN 2011202794021 U CN2011202794021 U CN 2011202794021U CN 201120279402 U CN201120279402 U CN 201120279402U CN 202190441 U CN202190441 U CN 202190441U
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Abstract
The utility model provides a light source driving circuit and ceiling lamp comprising same. The light source driving circuit comprises a rectifier circuit, a voltage regulating circuit and a light emitting diode driving circuit, wherein, the light emitting diode driving circuit adjusts the circuit to receive the second output and adjusts the second output from the voltage, the third output of the voltage with a specific cycle is generated and provided to the positive end of the light emitting diode light source, in which, the specific cycle is less than the cycle of the voltage of the second output. The light source driving circuit has the advantages that the structure is simple, the power consumption of the micro current is low, and without burning, the ability of power anti-interference is strong, has the functions of explosion-proof, long service, good versatility, low cost, and the health of eyes is not affected in a long time lighting and the like, the main performance parameters is conformed to the requirements of the relevant national standards.
Description
Technical field
The utility model relates to electronic circuit field.More particularly, the utility model relates to a kind of light source driving circuit and the ceiling light that comprises this light source driving circuit.
Background technology
LED source is the light source that comprises one or more light-emitting diodes (LED), because characteristics such as the luminous efficiency of light-emitting diode is high, life-span length make LED source get most of the attention as lighting device of future generation.Through the parameters of the light-emitting diode selecting to comprise in the LED source and the quantity of light-emitting diode, brightness and the different LED source of power that can realize having dealing with various requirements.For example, LED source can be as ceiling light, desk lamp, the factory building lamp of room lighting and the various lighting devices such as street lamp that are used as outdoor lighting.
Because light-emitting diode has the characteristic of DC driven, so when the alternating voltage of civil power commonly used comes the driven for emitting lights diode light-source with production with in living, need alternating voltage be converted into the rectifier circuit of direct voltage.Yet when alternating voltage was unstable, for example, in peak of power consumption periods such as night or red-letter days, the frequency of the alternating voltage of civil power maybe not can be stabilized in specified 50Hz or 60Hz, and possibly occur such as 90Hz or higher instantaneous frequency; Simultaneously, the level of the alternating voltage of civil power also possibly change in the scope such as 90V～290V.In the prior art; Only convert alternating voltage into direct voltage with the driven for emitting lights diode light-source through rectifier circuit; So the above-mentioned instability of frequency and voltage that can't solve alternating voltage is for the influence of LED source; Cause brightness variation, flicker, the cisco unity malfunction of LED source even cause LED source to damage, therefore reduced the reliability of LED source, greatly shortened life-span of light-emitting diode.
Fig. 1 is the oscillogram that the driving DC voltage that is used for the driven for emitting lights diode light-source that produces as the alternating voltage of civil power with by the light source driving circuit according to prior art is shown.In the prior art; Because only adopted rectifier circuit to carry out the AC-DC conversion; So when the alternating voltage of input had (having peak value the is Vpeak's) sinusoidal waveform shown in curve C ac, resultant direct voltage had the waveform of (having peak value the is Vpeak's) variation shown in curve C dc.Therefore, when the direct voltage with the variation waveform shown in curve C dc came the driven for emitting lights diode, light-emitting diode was not operated in its best operating state.And because light-emitting diode need could luminous when the voltage that applies is higher than certain luminous operating voltage, so work as direct voltage when being lower than this luminous operating voltage (for example, equaling 0V, as shown in fig. 1), light-emitting diode does not have luminous.Therefore, adopt direct voltage to come the driven for emitting lights diode can cause light-emitting diode between luminous and not luminous, to switch (flicker) continually with the waveform shown in curve C dc, thus the life-span of having reduced light-emitting diode.Simultaneously; Be lower than at direct voltage during the time period of luminous operating voltage; The electric energy major part that is applied to light-emitting diode is converted to heat energy, thereby causes capacity usage ratio to reduce, and then causes luminous efficiency to reduce; The heat of not expecting that light-emitting diode also produces therefore the time and reduce its life-span is accelerated aging.In addition, under the driving of the direct voltage of the waveform with the variation shown in curve C dc, light-emitting diode is with the frequency scintillation of 1/T, thereby greatly influenced the personnel's of work under such lighting environment eyesight.
Because in the LED source of prior art, will directly be provided to light-emitting diode, so need carry out strict selection for parameter that is included in the diode in the LED source (such as rated voltage, rated current etc.) and quantity etc. from the direct voltage of rectifier circuit output as driving voltage.Therefore, the light-emitting diode that does not meet top requirement will be regarded as substandard products and be dropped.In addition; If some light-emitting diode is because of long-play deterioration or damage in LED source; Then need regulate, and only adopt rectifier bridge to come the light source driving circuit according to prior art of driven for emitting lights diode can't realize adjusting for the driving voltage that is provided to light-emitting diode to the driving voltage that is provided to light-emitting diode.
The utility model content
In order to overcome top some or whole technical problems; Exemplary embodiment provides a kind of light source driving circuit and the ceiling light that comprises this light source driving circuit; Its circuit is simple, technology path is novel, principle is correct, design innovation, components and parts are selected standard, little electric current power consumption is low, not hot, strong to the power supply antijamming capability; Have that longevity is excused from a college course, versatility is good, cost is low, long-time illumination does not influence advantages such as eye health, Specifeca tion speeification meets the requirement of concerned countries standard.
According to exemplary embodiment; A kind of light source driving circuit that is used to drive the ceiling light that comprises LED source is provided, and said light source driving circuit comprises rectifier circuit, voltage regulator circuit and light-emitting diode drive source circuit, wherein; Rectifier circuit is connected to external power source; Positive terminal with through rectifier circuit will be provided to voltage regulator circuit through first output of rectification, and voltage regulator circuit is regulated the voltage of first output, is lower than second output of the voltage of first output with formation voltage; The light-emitting diode drive source circuit receives second output and regulates second output from voltage regulator circuit; Have with generation specific period voltage the 3rd output and the 3rd output is provided to the positive terminal of LED source, wherein, said specific period is less than the cycle of the voltage of second output.
The voltage waveform of said the 3rd output is sawtooth waveform, square waveform, triangular waveform or sinusoidal waveform.
The valley point voltage value of the 3rd output is greater than zero, and the crest voltage value of the 3rd output is less than the crest voltage value of first output.
The valley point voltage value of the 3rd output is more than or equal to the luminous operational voltage value of LED source.
Said light source driving circuit also comprises current regulating circuit, and this current regulating circuit is connected between the negative pole end of negative pole end and rectifier circuit of LED source, is predetermined value with the Current Regulation that will in LED source, flow.
Said light source driving circuit also comprises protection and improves circuit; This protection and improve circuit and be connected between external power source and the rectifier circuit, and by alleviate from external power source be provided to high frequency clutter the output of rectifier circuit be connected in series between external power source and the rectifier circuit inductor with filter the capacitor that is connected in parallel with rectifier circuit that is provided to high frequency clutter the output of rectifier circuit from external power source and form.
According to exemplary embodiment, a kind of ceiling light is provided, said ceiling light comprises: the light source driving circuit plate is provided with aforesaid light source driving circuit on the light source driving circuit plate; Light source board is equipped with the LED source that is electrically connected to said light source driving circuit on light source board; Mounting seat and diffuser, mounting seat combines with diffuser, to hold light source driving circuit plate and light source board.
LED source comprises a plurality of light-emitting diode group that are connected in parallel, and each light-emitting diode group comprises a plurality of light-emitting diodes that are connected in series.
The a plurality of light-emitting diodes that are included in the LED source are installed to be the vertical direction inclination with respect to light source board; Thereby forming a plurality of first areas and a plurality of second area on the light source board between the body at each light-emitting diode; Wherein, the distance in the first area between the body of light-emitting diode is less than the distance in second area between the body of light-emitting diode.
Be included in a plurality of light-emitting diodes in the LED source and be installed to be tilt 0 ° to 5 ° angle of vertical direction with respect to light source board.
According to exemplary embodiment; Above-mentioned semiconductor cold light source ceiling light is connected to commercial power socket; 220V, 50Hz alternating current are through above-mentioned light source driving circuit optimization, rectification, adjusting; Output be equivalent to light-emitting diode group operating voltage and the pressure drop of light source regulating circuit and direct voltage, make the normal luminous work of semiconductor cold light source (that is, LED source 4).During deenergization, each circuit in the light source driving circuit forms effective repid discharge loop automatically, and the semiconductor cold light source is extinguished rapidly, bleeds off electric charge in the circuit simultaneously rapidly.
According to the light source driving circuit of exemplary embodiment and the ceiling light that comprises this light source driving circuit can realize that long-term illumination does not affect one's power of vision, luminous efficiency high, have light source nargin, anti-power supply interference performance is strong.Its power consumption is very little simultaneously, and caloric value keeps the low temperature of lamp constant far below known LED source.For versatility and low cost, lamp housing adopts the general light fixture material of ceiling light, satisfies being widely used and installation requirement, and all components and parts have been realized production domesticization.Circuit board mounting base and translucent cover all adopt the versatility lamp outer casing; Size and instructions for use according to the light fixture size; Can process the ceiling light of different wattages such as 6w, 9w, 12w, 15w, 18w, 21w respectively, the equal National standard of index such as its interchangeability, protection against electric shock, insulation and economize on electricity intensity, mechanical strength, fail safe.
According to exemplary embodiment, LED source can be the semiconductor cold light source.Light source driving circuit has adopted semiconductor cold light source regulating circuit with comprising in the ceiling light of this light source driving circuit; Light-emitting diode group obtains optimum operating voltage under the satisfied externally primary power source normal power supply condition; And it is very big (under the state of 100V～300V) in voltage fluctuation; Also can stablize provides power supply, makes the light-emitting diode cold light source be able to work.To a shaped article, this circuit need not adjusted after solidifying.
Description of drawings
Fig. 1 is the oscillogram that the driving DC voltage that is used for the driven for emitting lights diode light-source that produces as the alternating voltage of civil power with by the light source driving circuit according to prior art is shown;
Fig. 2 is the schematic block diagram that illustrates according to the light source driving circuit of exemplary embodiment;
Fig. 3 is the oscillogram that illustrates according to the driving voltage that is used for the driven for emitting lights diode light-source of exemplary embodiment;
Fig. 4 is the schematic diagram that illustrates according to the ceiling light of exemplary embodiment;
Fig. 5 is the schematic cross sectional views that illustrates according to the light source board in the ceiling light of exemplary embodiment.
Embodiment
Specifically describe light source driving circuit and the ceiling light that comprises this light source driving circuit below in conjunction with the drawings according to exemplary embodiment.
Fig. 2 is the schematic block diagram that illustrates according to the light source driving circuit of exemplary embodiment.As shown in Figure 2, the light source driving circuit according to exemplary embodiment comprises rectifier circuit 1, voltage regulator circuit 2 and light-emitting diode drive source circuit 3.
Rectifier circuit 1 is connected to external power source.External power source is that 50Hz or 60Hz, rated voltage are civil power or other AC powers of 110V or 220V for rated frequency for example.Rectifier circuit 1 will convert direct voltage into from the alternating voltage that external power source provides.Rectifier circuit 1 will be provided to voltage regulator circuit 2 through first output of rectification through its positive terminal.Rectifier circuit 1 can be the bridge circuit of routine.In one example, can withstand voltage be higher through selecting, operating current has the rectifier diode of 20 times of left and right sides surpluses to realize rectifier circuit 1.
As shown in Figure 2, can also comprise special protection and improve circuit 5 according to the light source driving circuit of exemplary embodiment.Protect and improve circuit 5 and be connected between external power source and the rectifier circuit 1.The protection and improve circuit 5 and for example form by filter inductor and capacitor.Under these circumstances; The inductor of high impedance is connected in series between external power source and the rectifier circuit 1; Be provided to the high frequency clutter the output of rectifier circuit 1 to alleviate from external power source; Low-impedance capacitor and rectifier circuit 1 are connected in parallel, and are provided to the high frequency clutter the output of rectifier circuit 1 to filter from external power source.The common high-frequency impulse energy that absorbs as the AC network of external power source of the inductor of high impedance and low-impedance capacitor; Thereby effectively protect the whole light source drive circuit; Improved the EMC performance (i.e. the Electro Magnetic Compatibility that measurement system other electromagnetic radiation sources of opposing disturb) of integrated light source, can effectively reduce EMI (the electromagnetic interference (EMI) emissions total amount of sending during equipment work) simultaneously and disturb and sensitiveness.Therefore, protect and improve magnitude of voltage and the stability of frequency that circuit 5 has guaranteed to be provided to the alternating voltage of rectifier circuit 1, and then guarantee to be provided to the stability of the driving voltage of LED source.Therefore, the above-mentioned defective that exists in the prior art such as brightness variation, flicker, cisco unity malfunction or damage of the LED source that can prevent to cause, the reliability and the life-span of having improved LED source because of instantaneous high pressure and high frequency.
As shown in Figure 2, voltage regulator circuit 2 is connected between rectifier circuit 1 and the light-emitting diode drive source circuit 3.Voltage regulator circuit 2 is regulated the voltage of first output, is lower than second output of the voltage of first output with formation voltage, and it is provided to light-emitting diode drive source circuit 3.Usually, the selected of voltage difference between the driving voltage of (that is first output) voltage of the secondary power supply after the rectification and load (that is LED source) is very important.Bigger voltage difference is very disadvantageous for powerful LED source, can cause the reduction of whole light source drive circuit efficient, thermal losses and power consumption to increase, and is also high to the requirement of power supply stability.Yet; For the low power LED light source; Under the situation of the output current of the secondary power supply after the rectification being controlled (for example, the output current of the secondary power supply after the rectification being controlled at below the 50mA), so bigger voltage difference will help the whole light source drive circuit.This is because can not need adopt during light source driving circuit relevant transistor to feed back the Current Control point etc. that method such as special-purpose adjuster circuit is adjusted electric current or set led array in design, can directly come Control current with resistance.Therefore, can realize light source driving circuit more simply, reliably according to exemplary embodiment.In a preferred exemplary embodiment, second output that voltage regulator circuit 2 will have than the voltage of the low about 20V of voltage～about 40V of first output is provided to the light-emitting diode drive source circuit.
As shown in Figure 2, light-emitting diode drive source circuit 3 is connected between voltage regulator circuit 2 and the LED source 4.Light-emitting diode drive source circuit 3 receives second output and regulates second output from voltage regulator circuit 2, have with generation specific period voltage the 3rd output and it is provided to the positive terminal of LED source 4.For example, the cycle of the voltage of the 3rd output can be less than cycle of voltage of first output.Under these circumstances, light-emitting diode drive source circuit 3 can comprise known frequency adjustment circuit.Light-emitting diode drive source circuit 3 can also further be regulated second output, to obtain being suitable for the 3rd output of driven for emitting lights diode light-source.For example, light-emitting diode drive source circuit 3 can be regulated second output, to obtain having the 3rd output of suitable maximum (peak value) magnitude of voltage Vtop and/or minimum (valley) magnitude of voltage Vbottom.Under these circumstances, light-emitting diode drive source circuit 3 can also comprise the known voltage regulating circuit.Will be described in greater detail below light-emitting diode drive source circuit 3.
According to an exemplary embodiment; First output of rectifier circuit 1 is regulated through voltage regulator circuit 2 and light-emitting diode drive source circuit 3; Thereby be met current value, the suitable load of magnitude of voltage (promptly; The 3rd output of needs LED source 4) makes LED source 4 obtain the good power supply supply in the certain voltage scope.The 3rd output after light-emitting diode drive source circuit 3 further parameters optimization is provided to LED source 4.According to an exemplary embodiment, can adopt known integrated circuit modules to realize light-emitting diode drive source circuit 3.Under these circumstances, can select the other integrated circuit that free footnote will is arranged of high pressure pin specially, thereby suitable creepage distance is provided.
In one example, LED source 4 comprises a plurality of light-emitting diode group that are connected in parallel, and each light-emitting diode group comprises a plurality of light-emitting diodes that are connected in series.LED source 4 can be the semiconductor cold light source.
Fig. 3 illustrates the alternating voltage waveform Cac that provides from external circuit and according to the sketch map of the voltage waveform of the 3rd output that is used for the driven for emitting lights diode light-source of exemplary embodiment.
As shown in Figure 3, the alternating voltage waveform Cac that provides from external circuit has cycle 2T, so the cycle of voltage waveform through first output of rectification of rectifier circuit 1 is T (referring to Fig. 1).The cycle T of the voltage waveform that the cycle t of the voltage waveform of the 3rd output of light-emitting diode drive source circuit 3 can export much smaller than the cycle 2T and first of alternating voltage waveform Cac.For this reason, light-emitting diode drive source circuit 3 can comprise known frequency adjustment circuit.Therefore; Under the driving of the 3rd such output; LED source 4 is the frequency 1/t that changes of luminosity that the variation of the magnitude of voltage of t occurs much larger than the frequency 1/2T of alternating voltage (for example according to the cycle; 50Hz or 60Hz), therefore can protect the user's under the illumination of the LED source 4 that is in such driving eyesight.
As shown in Figure 3, the voltage waveform that is provided to the 3rd output of LED source 4 can be triangular wave (shown in curve C dc1), square wave (shown in curve C dc2), sinusoidal wave (shown in curve C dc3) or sawtooth waveforms (shown in curve C dc4 and Cdc5).For this reason, light-emitting diode drive source circuit 3 can comprise known waveform shaping circuit, so that the 3rd output that is provided to light-emitting diode drive source circuit 3 from voltage regulator circuit 2 has an above-mentioned voltage waveform.
As shown in Figure 3, the valley point voltage value of the 3rd output is greater than zero, and the crest voltage value of the 3rd output is less than the crest voltage value Vpeak of first output.For example, the valley point voltage value of the 3rd output can be more than or equal to the luminous operating voltage of LED source 4.For this reason, light-emitting diode drive source circuit 3 can be regulated second output of voltage regulator circuit 2, to obtain three output of valley point voltage value Vbottom more than or equal to predetermined threshold value Vth.Said threshold value Vth can be the luminous operating voltage of LED source 4, and for example, threshold value Vth is the minimum voltage that guarantees that LED source 4 is luminous.Therefore; Light-emitting diode in the LED source 4 is luminous continuously under the driving of the 3rd such output; Thereby can prevent aforesaidly, prolong life-span of light-emitting diode, improve capacity usage ratio because of the discontinuous luminous various shortcomings that cause of light-emitting diode; Improve luminous efficiency, reduce the heat that light-emitting diode produced.
In addition, make the magnitude of voltage of second output that is provided to light-emitting diode drive source circuit 3 less than the magnitude of voltage of first output because of the adjusting of voltage regulator circuit 2.Correspondingly, from light-emitting diode drive source circuit 3 be provided to LED source 4 the 3rd output crest voltage value Vtop can less than provide from rectifier circuit 1 first output crest voltage value Vpeak.Therefore, in current exemplary embodiment, the scope Vtop～Vbottom of magnitude of voltage of the 3rd output that is provided to LED source 4 is much smaller than the scope Vpeak～0V (referring to Fig. 1) according to the magnitude of voltage of the driving voltage of prior art.So; The magnitude of voltage because of the 3rd output of the LED source 4 that drives by such the 3rd output in scope Vtop～Vbottom, change the change of luminous intensity that causes can much smaller than according to the LED source of prior art because of driving voltage value changes the change of luminous intensity that causes in scope Vpeak～0V, thereby vision protection more effectively.
Above-described voltage regulator circuit 2 is two independent circuit with light-emitting diode drive source circuit 3; Yet; Exemplary embodiment is not limited thereto, and in some instances, voltage regulator circuit 2 can be integrated in the circuit with light-emitting diode drive source circuit 3.
As shown in Figure 2, can also comprise current regulating circuit 6 according to the light source driving circuit of exemplary embodiment.Current regulating circuit 6 is connected between the negative pole end of negative pole end and rectifier circuit 1 of LED source 4, is predetermined value with the Current Regulation that will in LED source 4, flow.Current regulating circuit 6 can play a part the quantitative of output voltage and/or electric current and/or can regulate continuously, to satisfy the requirement of different lighting apparatus.For example; Current regulating circuit 6 can comprise variable resistance; Thereby, be different values with the Current Regulation that will output to the negative pole end of rectifier circuit 1 from the negative pole end of LED source 4 through can be continuously or the stepping ground resistance value of regulating this variable resistance.Therefore, can realize continuously or the brightness of LED source 4 is regulated on stepping ground.In another example; Current regulating circuit 6 can be resaistance-capacity coupling circuit; Wherein, Current regulating circuit 6 can comprise low-impedance capacitor (smmothing capacitor), for carrying out filtering at the issuable high-voltage pulse of LED source 4 duration of works, makes LED source 4 obtain more level and smooth, stable voltage with further.
On the other hand; When LED source 4 works long hours; The characteristic of the element in element in the light-emitting diode drive source circuit 3 and/or the LED source 4 maybe deterioration or is damaged, and therefore causes the brightness of LED source 4 that the change of not expecting takes place.Current regulating circuit 6 can compensate such brightness and change, thereby guarantees that luminosity is constant, has improved light source driving circuit and the reliability of the LED source that drives through this light source driving circuit.Comprise at current regulating circuit 6 under the situation of variable capacitor and/or variable resistance; The capacitance that can be through the manual adjustments variable capacitor and/or the resistance value of variable resistance are controlled the voltage that is provided to LED source 4 or are flow through the electric current of LED source 4, thereby guarantee that luminosity is not changed.
In addition, as shown in Figure 2, said light source driving circuit can also comprise the filter regulator circuit 7 that is connected in parallel with LED source 4, is provided to the driving voltage of LED source with further optimization, improves to drive reliability.Filter regulator circuit 7 plays further reduction EMI (the electromagnetic interference (EMI) emissions total amount of sending during equipment work) and disturbs and sensitiveness, improves the power supply performance of light source driving circuit to the voltage stabilizing of LED source 4.The harmful clutter that exchanges that produces when at this moment, filter regulator circuit can be eliminated maybe be in driving voltage residual working with light-emitting diode.In Fig. 2, filter circuit 7 is exemplarily illustrated as and comprises capacitor, yet exemplary embodiment is not limited thereto, and can adopt known various filter regulator circuits to realize filter regulator circuit 7.In addition, in order to guarantee and improve the response speed of light source, the value of the capacitor in the filter regulator circuit 7 has been carried out suitable adjustment, it is very fast to make that light source switches on and off speed.
Obtain optimum operating voltage according to light-emitting diode under the satisfied externally primary power source normal power supply condition of the light source driving circuit of exemplary embodiment; And it is very big (under the state of 100V～300V) in voltage fluctuation; Also power supply can be provided, make LED source be able to work.To a shaped article, this circuit parameter need not adjusted after solidifying.
Fig. 4 is the schematic diagram that illustrates according to the ceiling light of exemplary embodiment.Fig. 5 is the schematic cross sectional views that illustrates according to the light source board in the ceiling light of exemplary embodiment.Shown in Fig. 4 and Fig. 5, comprise light source driving circuit plate 11, light source board 12, mounting seat 13 and diffuser 14 according to the ceiling light of exemplary embodiment.Light source driving circuit plate 11 is provided with the above-mentioned light source driving circuit according to exemplary embodiment.The LED source 4 that is electrically connected to said light source driving circuit is installed on light source board 12.Mounting seat 13 combines with diffuser 14, to hold light source driving circuit plate 11 and light source board 12.Can be installed on the wall on roof etc. for example through mounting seat 13 according to the ceiling light of exemplary embodiment.Can transmission be launched into the ceiling light outside from the light that is installed in LED source 4 emissions on the light source board 12 through diffuser 14.
According to exemplary embodiment, ceiling light can also comprise the fixing hole 15 that is formed in light source driving circuit plate and the light source board, and light source driving circuit plate and light source board can be fixed in the mounting seat through this fixing hole.
The a plurality of LEDs that are included in the LED source 4 can be installed to be the vertical direction inclination with respect to light source board 12, as shown in Figure 5.Through above-mentioned layout; First area HTA and second area LTA can formed on the light source board 12 between the body at each LED; Wherein, the distance in the HTA of first area between the body of LED is less than the distance in second area LTA between the body of LED.For example, can be through being arranged in the inclination of the LED on the light source board 12, make distance between the body of the LED that at least some are adjacent less than the distance between the body of other adjacent LEDs at least.Therefore; Even (for example with the pin arrangement pattern of the essentially identical rule of pin distances; Matrix pattern) LED is installed on the light source board 12, also can forms first area HTA and second area LTA through LED is installed obliquely.
Because compare with the distance between the body of LED in second area LTA; Distance between the body of the LED in the HTA of first area is less; Promptly; The body of the LED in the HTA of first area is more intensive, so when LED source 4 was luminous, the temperature of first area HTA can be higher than the temperature of second area.Therefore, first area HTA also can be called high-temperature area, and second area LTA also can be called low-temperature region.Because of each regional temperature difference can cause each regional air pressure different.That is, the air pressure of high-temperature area is lower than the air pressure of low-temperature region.Therefore, the principle that produces wind according to the air horizontal movement can be known, the hypobaric high-temperature area of the air flow of anticyclonic low-temperature region, thus produce wind.When LED source 4 is luminous; Because compare with the LED in second area LTA; The body of the LED in the HTA of first area is more intensive; So temperature height and air pressure in the HTA of first area are low, and the temperature in second area LTA is low and air pressure is high.Because of such draught head has produced the air-flow that flows to first area HTA (high-temperature area) from second area LTA (low-temperature region), that is, and natural wind.Through flowing of such air-flow from low-temperature region to high-temperature area, accelerated the heat transmission between the air that LED is in contact with it, thereby can dispel the heat to LED better.
One of important factors that influences semiconductor light-emitting-diode and application product life-span thereof is its heat dissipation problem.The heat radiation of current high power led lighting product is to rely on bulky heat dissipation equipment to carry out forcing heat radiation from heat conduction, heat radiation or with accessory equipments such as ventilating fans.Low power LED itself is little because of its operating current, caloric value is little, in its application product, considers heat dissipation design hardly, therefore adopts equal altitudes, equidistant, equal angular proper alignment mode usually.This way can be ignored to the low-power applications product really; But then should in design, need think better of and solve the problem of its heat radiation at the illuminating product of the medium-term and long-term work of improper ventilation environment to making more large-scale power application product (like street lamp) and needing.According to exemplary embodiment; Vertical direction through light-emitting diode being installed as with respect to light source board tilts; Thereby formed many passage of heats of natural wind that the motion principle that has utilized atmosphere produces are dispelled the heat, and have therefore reached the optimum efficiency of natural heat dissipation preferably.
Preferably, be included in a plurality of LEDs in the LED source 4 and can be installed to be tilt 0 ° to 5 ° angle of vertical direction with respect to light source board 12.Usually, 0 ° to 5 ° is the permissible error scope of light-emitting diode mounting process, does not have the problem of light loss.In addition, under the situation of the light-emitting diode big, can strengthen mounting inclination angle because of the lighting angle selected according to the purposes of product.
Illuminating product to the 180W of 5400 light-emitting diodes has been installed through this mounting means has carried out about 168 hours continuous luminous survey.Up to EOT, the internal temperature of this product remains at below 60 ℃ from the test beginning.Can find out from the result of this test, because so irregular passage of heat, make and in small-power semiconductor diode illuminating product, can realize suppressing temperature rise and the effect of power-assisted natural heat dissipation in the passage.This not only helps really to embody the meaning of semiconductor cold light source illumination, simultaneously to having carried out effective correction with traditional temperature rise mode of energising close association service time.This radiating mode is a kind of lively application that produces the natural wind energy physical principle; Saved a large amount of heat dissipation equipments and the input expense of utilizing auxiliary equipment such as fan to force heat radiation, and the more important thing is and realized once well energy-conserving and environment-protective in the optical semiconductor product-derived.
In addition, because the vertical direction that LED is installed as with respect to light source board 12 tilts, so can enlarge the illumination zone of ceiling light.
In addition, because the angle of inclination of LED is different, thus can realize the illuminating effect similar or identical with the illuminating effect of shadowless lamp, thus further protected in eyesight according to the user under the illumination of the ceiling light of exemplary embodiment.
As stated, in the prior art, adopt equal altitudes, equidistant, equal angular proper alignment mode that light-emitting diode is installed usually.Yet,, adopt not the mode of isogonism that LED is installed according to example property embodiment; Promptly; The vertical direction that LED is installed as with respect to light source board 12 tilts, and the angle of inclination of each LED can be incomplete same, as shown in Figure 5.In Fig. 5, have a different distances between the body of each LED, but the distance between the pin of each LED can be identical.In other words; Can be (for example with the pin arrangement pattern of the essentially identical rule of pin distances; Matrix pattern) LED is installed on the light source board 12; And the vertical direction that only LED is installed as with respect to light source board 12 tilts, thereby for example is irregularly formed first area HTA and second area LTA.Yet; Exemplary embodiment is not limited thereto; Can LED be installed with the incomplete same pin arrangement pattern of pin distances, and/or LED is installed as with respect to the vertical direction of light source board 12, thereby form first area HTA and second area LTA.
According to an exemplary embodiment, can be through selecting the quantity of LED, to realize the ceiling light of various rated power such as 6W, 9W, 12W, 15W, 18W, 21W.
According to exemplary embodiment; Above-mentioned semiconductor cold light source ceiling light is connected to commercial power socket; 220V, 50Hz alternating current are through above-mentioned light source driving circuit optimization, rectification, adjusting; Output be equivalent to light-emitting diode group operating voltage and the pressure drop of light source regulating circuit and direct voltage, make the normal luminous work of semiconductor cold light source (that is, LED source 4).During deenergization, each circuit in the light source driving circuit forms effective repid discharge loop automatically, and the semiconductor cold light source is extinguished rapidly, bleeds off electric charge in the circuit simultaneously rapidly.
High according to the light source driving circuit of exemplary embodiment and the ceiling light luminous efficiency that comprises this light source driving circuit, have light source nargin, anti-power supply interference performance is strong.Its power consumption is very little simultaneously, and caloric value keeps the low temperature of lamp constant, and can realize that long-term illumination does not affect one's power of vision far below known LED source.For versatility and low cost, lamp housing adopts the general light fixture material of ceiling light, satisfies being widely used and installation requirement, and all components and parts have been realized production domesticization.Circuit board mounting base and lampshade all adopt the versatility lamp outer casing; Size and instructions for use according to the light fixture size; Can process the ceiling light of different wattages such as 6W, 9W, 12W, 15W, 18W, 21W respectively, the equal National standard of index such as its interchangeability, protection against electric shock, insulation and economize on electricity intensity, mechanical strength, fail safe.
According to exemplary embodiment, LED source can be the semiconductor cold light source.Light source driving circuit has adopted semiconductor cold light source regulating circuit with comprising in the ceiling light of this light source driving circuit; Light-emitting diode group obtains optimum operating voltage under the satisfied externally primary power source normal power supply condition; And it is very big (under the state of 100V～300V) in voltage fluctuation; Also can stablize provides power supply, makes the light-emitting diode cold light source be able to work.To a shaped article, this circuit need not adjusted after solidifying.
Though illustrated and described the example of exemplary embodiment; But what those skilled in the art should understand that is; Exemplary embodiment is not limited thereto, and under the situation that does not break away from the spirit that limits like claim and scope, can carry out various changes and modification at this.
Claims (10)
1. a light source driving circuit that is used to drive the ceiling light that comprises LED source is characterized in that said light source driving circuit comprises rectifier circuit, voltage regulator circuit and light-emitting diode drive source circuit, wherein,
Rectifier circuit is connected to external power source, will be provided to voltage regulator circuit through first output of rectification with the positive terminal through rectifier circuit,
Voltage regulator circuit is regulated the voltage of first output, is lower than second output of the voltage of first output with formation voltage,
The light-emitting diode drive source circuit receives second output and regulates second output from voltage regulator circuit; Have with generation specific period voltage the 3rd output and the 3rd output is provided to the positive terminal of LED source; Wherein, said specific period is less than the cycle of the voltage of first output.
2. light source driving circuit as claimed in claim 1 is characterized in that the voltage waveform of said the 3rd output is sawtooth waveform, square waveform, triangular waveform or sinusoidal waveform.
3. light source driving circuit as claimed in claim 1, the valley point voltage value that it is characterized in that the 3rd output is greater than zero, and the crest voltage value of the 3rd output is less than the crest voltage value of first output.
4. light source driving circuit as claimed in claim 3 is characterized in that the luminous operational voltage value of the valley point voltage value of the 3rd output more than or equal to LED source.
5. like any described light source driving circuit of claim among the claim 1-4; It is characterized in that said light source driving circuit also comprises current regulating circuit; This current regulating circuit is connected between the negative pole end of negative pole end and rectifier circuit of LED source, is predetermined value with the Current Regulation that will in LED source, flow.
6. like any described light source driving circuit of claim among the claim 1-4; It is characterized in that said light source driving circuit also comprises protection and improves circuit; This protection and improve circuit and be connected between external power source and the rectifier circuit, and by alleviate from external power source be provided to high frequency clutter the output of rectifier circuit be connected in series between external power source and the rectifier circuit inductor with filter the capacitor that is connected in parallel with rectifier circuit that is provided to high frequency clutter the output of rectifier circuit from external power source and form.
7. ceiling light is characterized in that said ceiling light comprises:
The light source driving circuit plate is provided with on the light source driving circuit plate like any described light source driving circuit of claim among the claim 1-6;
Light source board is equipped with the LED source that is electrically connected to said light source driving circuit on light source board;
Mounting seat and diffuser, mounting seat combines with diffuser, to hold light source driving circuit plate and light source board.
8. ceiling light as claimed in claim 7 is characterized in that LED source comprises a plurality of light-emitting diode group that are connected in parallel, and each light-emitting diode group comprises a plurality of light-emitting diodes that are connected in series.
9. ceiling light as claimed in claim 8; The a plurality of light-emitting diodes that it is characterized in that being included in the LED source are installed to be the vertical direction inclination with respect to light source board; To form first area and second area on the light source board between the body at each light-emitting diode; Wherein, the distance in the first area between the body of light-emitting diode is less than the distance in second area between the body of light-emitting diode.
10. ceiling light as claimed in claim 9 is characterized in that being included in a plurality of light-emitting diodes in the LED source and is installed to be tilt 0 ° to 5 ° angle of vertical direction with respect to light source board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202794021U CN202190441U (en) | 2011-08-02 | 2011-08-02 | Light source driving circuit and ceiling lamp comprising same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202794021U CN202190441U (en) | 2011-08-02 | 2011-08-02 | Light source driving circuit and ceiling lamp comprising same |
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| Publication Number | Publication Date |
|---|---|
| CN202190441U true CN202190441U (en) | 2012-04-11 |
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| CN2011202794021U Expired - Fee Related CN202190441U (en) | 2011-08-02 | 2011-08-02 | Light source driving circuit and ceiling lamp comprising same |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102300370A (en) * | 2011-08-02 | 2011-12-28 | 李光男 | Light source driving circuit and ceiling-mounted lamp containing light source driving circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102300370A (en) * | 2011-08-02 | 2011-12-28 | 李光男 | Light source driving circuit and ceiling-mounted lamp containing light source driving circuit |
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Granted publication date: 20120411 Termination date: 20170802 |