CN201345763Y - Energy saving control circuit of LED light fixture - Google Patents
Energy saving control circuit of LED light fixture Download PDFInfo
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- CN201345763Y CN201345763Y CNU2009200506268U CN200920050626U CN201345763Y CN 201345763 Y CN201345763 Y CN 201345763Y CN U2009200506268 U CNU2009200506268 U CN U2009200506268U CN 200920050626 U CN200920050626 U CN 200920050626U CN 201345763 Y CN201345763 Y CN 201345763Y
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model discloses an energy saving control circuit of LED light fixture for timing changing of brightness, which has advantages of simple structure, high efficiency, low power consumption and energy conservation, and can prolong service life of the light fixture. The energy saving control circuit comprises a rectification filtering circuit (1), a voltage stabilization circuit (2), an LED load (3), a constant-current source device (4) and a timing circuit (8), alternating current is changed into direct current after being rectified and filtered by the rectification filtering circuit (1), is changed into constant voltage direct current after voltage stabilization by the voltage stabilization circuit (2), and is output to form an output end (A) and a grounding end (G), the LED load (3) and the constant-current source device (4) are connected in series and connected between the output end (A) and the grounding end (G) to from a loop, the timing circuit (8) is connected with the voltage stabilization circuit (2) to provide timing feedback signal for the voltage stabilization circuit (2) and change the output voltage of the voltage stabilization circuit (2). The utility model can be widely applied in LED light fixture field.
Description
Technical field
The utility model relates to a kind of circuit of the LED of being used for light fixture, relates in particular to a kind of LED light fixture energy-saving control circuit.
Background technology
At present, the application of LED more and more widely, the LED light fixture that is used for daily open air and room lighting is also just more and more universal.The output voltage of existing LED light fixture generally is changeless, thus light fixture to remain brightness when work constant.And in some occasion, light fixture does not need to remain the highest brightness, for example street lamp, garden lamp and corridor lamp, the before midnight people more for a long time, be necessary the brightness height, with the illuminating effect that provides, but the time after midnight people more after a little while, only need darker lighting effects can reach the effect of guidance lighting, brightness this moment is constant then to be a kind of waste.
In the circuit of LED light fixture; though the power consumption of LED is little; but require the power supply provided must electric current, voltage keeps relative stability within the specific limits; requiring simultaneously has certain overcurrent, overvoltage protection effect to LED; constant current or stabilized voltage power supply are normally adopted in the power supply that solves this class load; and in power circuit, also need to add to the circuit overcurrent protection of some element under abnormal conditions in the load, this just makes this class power supply have the drawback that element is many, circuit is complicated, the consumed power ratio is big.Fig. 1 is a kind of existing isolation type switching power supply voltage stabilizing circuit, so-called " isolated " is meant that the earth terminal of the both sides of transformer is independently, though it is stable that the voltage of the power output end of sort circuit can keep, but because its conducting voltage can descend after the LED long-term work at high temperature, if therefore the voltage at LED two ends remains unchanged, then its operating current can raise.So in the practical application of voltage stabilizing circuit, in use for some time, the phenomenon that the rising owing to electric current causes LED to be burnt usually can take place, reduction of service life.Fig. 2 is a kind of existing non-isolated power supply constant-current circuit, though sort circuit can guarantee the current stabilization of output, but under the situation of a plurality of load parallel connections, then can cause the inequality of electric current in each branch road to distribute, so that after a paths of LEDs burns, quicken to cause all burning of a paths of LEDs easily.And, more than the voltage stabilizing or the constant-current circuit of two circuit representatives, its add ons is many, these elements can loss bigger power, particularly pliotron, make the LED of power saving originally use the purpose that does not reach energy-conservation province consumption.
" MOSFET " is the abbreviation of English " metal-oxide-semiconductor field effect transistor ", and meaning i.e. " mos field effect transistor ", and its principle is the basis of all modern integrated circuits chips.A depletion type MOS FET device is made of three essential parts: source electrode (S), grid (G) and drain electrode (D).N-channel depletion mode metal-oxide-semiconductor field effect transistor near gate surface, has a shallow-layer doped layer with source leakage same polarity that source electrode is connected with drain electrode between source electrode and drain electrode.When grid and source voltage are timing, its saturation conduction electric current also increases with voltage increases, and this point is identical with enhancement mode MOSFET.But when grid and source electrode are idiostatic, when drain electrode imposes malleation, exhaust the linear zone that pipe rose through current spikes before this, just enter the saturation region of constant current conducting then, the drain voltage of this moment is known as saturation voltage, the size of drain electrode conducting electric current is relevant with the concentration and the degree of depth of shallow-layer doped layer, and general concentration and the big more then electric current of the degree of depth are big more.Impose negative voltage between grid and source electrode, then passage can be cut off, and the conducting electric current is zero, and the grid voltage of this moment is defined as cut-in voltage, if but channel concentration is too dense, the degree of depth is too dark, and then grid can't block channel current.Depletion type MOS tube is because when grid and source voltage were zero, the drain-source electrode current had been the constant current conducting, and it is convenient on logic is used that this point causes it to be not so good as the enhancement mode metal-oxide-semiconductor, uses so do not made device separately by industrial quarters so far.Since depletion type MOS tube when grid voltage is zero the characteristic of conducting and when drain voltage increases electric current puncture up to drain avalanche in the saturation region substantially, so it can be used as a constant-current source use.
The utility model content
Technical problem to be solved in the utility model is to overcome the deficiencies in the prior art, provide a kind of timing to change the LED light fixture energy-saving control circuit of brightness, this circuit structure is simple, efficient is high, low in energy consumption, energy-conservation, have two kinds of functions of constant current and constant voltage simultaneously, can prolong the useful life of light fixture.
The technical scheme that the utility model adopted is: the utility model comprises current rectifying and wave filtering circuit, voltage stabilizing circuit, the LED load, alternating current becomes constant voltage through described voltage stabilizing circuit voltage stabilizing again after described current rectifying and wave filtering circuit rectification and filtering become direct current direct current output forms output and earth terminal, described LED light fixture energy-saving control circuit also comprises constant-current source device, timing circuit, described LED load, be connected to after described constant-current source device is in series between described output and the described earth terminal and constitute the loop, described timing circuit is connected with described voltage stabilizing circuit, be used for providing regularly feedback signal, to change the output voltage of described voltage stabilizing circuit to described voltage stabilizing circuit.
Described LED light fixture energy-saving control circuit also comprises the fan circuit of the radiator fan power supply that is used to the LED light fixture.
Described fan circuit and described LED load, described constant-current source device are in series and are connected between described output and the described earth terminal; Perhaps, described fan circuit takes out powered by direct current from described voltage stabilizing circuit.
Described fan circuit comprises fan control module and shunt resistance, and described fan control module and described shunt resistance are in parallel.
Described voltage stabilizing circuit is a Switching Power Supply, and described voltage stabilizing circuit comprises circuit of power factor correction.
Described constant-current source device is a depletion mode fet, and the drain electrode of described depletion mode fet is a contact, and the source electrode of described depletion mode fet and grid short circuit mutually constitute another contact.
Described LED load comprises at least one group of several LED that are in series.
Every group of described LED all is in series with a described constant-current source device, after the series connection some groups again parallel connection do between described output of as a whole access and the described earth terminal.
Perhaps, each is organized and remakes as a whole and described constant-current source device after the described LED parallel connection and be in series.
Described LED light fixture energy-saving control circuit also comprises short-circuit protection circuit, and described short-circuit protection circuit is connected between the input and described current rectifying and wave filtering circuit of AC power.
The beneficial effects of the utility model are: because the utility model comprises current rectifying and wave filtering circuit, voltage stabilizing circuit, the LED load, constant-current source device, timing circuit, alternating current becomes constant voltage through described voltage stabilizing circuit voltage stabilizing again after described current rectifying and wave filtering circuit rectification and filtering become direct current direct current output forms output and earth terminal, described LED load, be connected to after described constant-current source device is in series between described output and the described earth terminal and constitute the loop, described timing circuit is connected with described voltage stabilizing circuit, be used for providing regularly feedback signal to described voltage stabilizing circuit, to change the output voltage of described voltage stabilizing circuit, the utility model is with described constant-current source device, described timing circuit, described voltage stabilizing circuit and described LED load organically combine, when entire circuit is started working, be described LED load output higher voltage, the brightness of light fixture is higher, after the time that process is set reaches, provide regularly feedback signal by described timing circuit to described voltage stabilizing circuit, the output voltage of described voltage stabilizing circuit is reduced, therefore, the brightness of light fixture also reduces, be applied in street lamp, on the light fixture such as garden lamp and corridor lamp, can be more for a long time the before midnight people, the higher brightness illumination is provided, the time after midnight people more after a little while, only need darker lighting effects can reach the effect of guidance lighting, light fixture does not need to remain the highest brightness, thereby reaches the effect of economize on electricity; In like manner, also can be set in when starting working, the lower voltage of described voltage stabilizing circuit output, after the time that process is set reaches, provide regularly feedback signal by described timing circuit to described voltage stabilizing circuit, make the output voltage raising of described voltage stabilizing circuit reach normal voltage, by the voltage of timesharing control light fixture, to reach energy-conservation effect; In addition, the utility model passes through the direct current output that described voltage stabilizing circuit voltage stabilizing becomes constant voltage after by described current rectifying and wave filtering circuit rectification and filtering alternating current being become direct current again, even described LED load at high temperature works long hours, when the electric current desire of its work increases, described constant-current source device can stop electric current to increase, and the voltage that described LED can be loaded on decline under the hot environment work is added on the described constant-current source device, prolong the useful life of described LED load, avoid burning, described constant-current source device is as an independent devices, convenient peripheral voltage stabilizing and the current stabilization circuit of replacing existing other circuit, make circuit element significantly reduce, circuit is simple, so the utility model can regularly change the brightness of LED light fixture, this circuit structure is simple, the efficient height, low in energy consumption, energy-conservation, have two kinds of functions of constant current and constant voltage simultaneously, can prolong the useful life of light fixture;
Because the utility model also comprises the fan circuit of the radiator fan power supply that is used to the LED light fixture, when described LED loaded work piece, simultaneously described fan circuit drives the radiator fan running, carry out active forced ventilation heat radiation, so existing head and shoulders above various passive heat radiations of radiating effect, can avoid led chip at high temperature to work, effectively increase the service life, because the existence of forced heat radiation, therefore can dwindle the volume of other metal heat sink, make fitting structure simple, volume is little, excellent in heat dissipation effect, long service life is so the utility model is to the good heat dissipation effect of light fixture, performance is higher, and the life-span is longer;
Because the utility model also comprises short-circuit protection circuit, described short-circuit protection circuit is connected between the input and described current rectifying and wave filtering circuit of AC power, so the utlity model has the over-current over-voltage protection function.
Description of drawings
Fig. 1 is a kind of schematic diagram of existing isolation type switching power supply voltage stabilizing circuit;
Fig. 2 is a kind of schematic diagram of existing non-isolated power supply constant-current circuit;
Fig. 3 is the circuit diagram of the utility model embodiment one;
Fig. 4 is the circuit diagram of the utility model embodiment two;
Fig. 5 is the circuit diagram of the utility model embodiment three.
Embodiment
Embodiment one:
As shown in Figure 3; the LED light fixture energy-saving control circuit of present embodiment comprises current rectifying and wave filtering circuit 1; voltage stabilizing circuit 2; LED load 3; constant-current source device 4; short-circuit protection circuit 5; timing circuit 8; alternating current becomes constant voltage through described voltage stabilizing circuit 2 voltage stabilizings again after described current rectifying and wave filtering circuit 1 rectification and filtering become direct current direct current output forms output terminals A and earth terminal G; described LED load 3; be connected to after described constant-current source device 4 is in series between described output terminals A and the described earth terminal G and constitute the loop; described timing circuit 8 is connected with described voltage stabilizing circuit 2; be used for providing regularly feedback signal, to change the output voltage of described voltage stabilizing circuit 2 to described voltage stabilizing circuit 2.Described current rectifying and wave filtering circuit 1 comprises bridge rectifier D 1 and filter capacitor C1; described short-circuit protection circuit 5 comprises fuse F1 and piezo-resistance RV1; be used for overcurrent and short-circuit protection; be connected between the input and described current rectifying and wave filtering circuit 1 of AC power; described fan circuit 6 comprises fan control module F1 and shunt resistance R10; described fan control module F1 and described shunt resistance R10 are in parallel; described constant-current source device 4 is a depletion mode fet; the drain electrode of described depletion mode fet is a contact, and the source electrode of described depletion mode fet and grid short circuit mutually constitute another contact.Described voltage stabilizing circuit 2 is Switching Power Supplies, described voltage stabilizing circuit 2 comprises circuit of power factor correction IC1, the model that described circuit of power factor correction IC1 adopts ST company to produce is the power supply PFC power factor control circuit of L6561, it is simple that it has a circuit, the efficient advantages of higher, be widely used at present in the power circuit of required power factor correctings such as electricity-saving lamp, its peripheral cell comprises capacitor C 2～C6, resistance R 1～R9, R14, adjustable resistance VR1, diode D2, D3, voltage stabilizing didoe Z1, metal-oxide-semiconductor Q1, transformer T1, described adjustable resistance VR1 can be according to the quantity regulating of described LED load 3, to control the output voltage of described voltage stabilizing circuit 2, described timing circuit 8 comprises that model is the single-chip microcomputer U1 of 89C2051, certainly, also can adopt other regularly IC reciprocal, its peripheral circuit comprises capacitor C 7～C11, resistance R 15, R17, diode D4, D5, voltage stabilizing didoe Z2, crystal oscillator Y1, the two ends of described diode D5 respectively with feedback resistance R14, the 19th pin of described single-chip microcomputer U1 is connected.When circuit is started working, the 19th pin of described single-chip microcomputer U1 is a low level, the 1st pin output current of described circuit of power factor correction IC1 is through described feedback resistance R14, described diode D5 conducting, and by described single-chip microcomputer U1 and described earth terminal G formation current circuit, at this moment, described feedback resistance R14 and described adjustable resistance VR1 are equivalent to be connected in parallel, the resistance of the described adjustable resistance VR1 of its total resistance value ratio is little, higher voltage of described voltage stabilizing circuit 2 outputs, described LED load 3 is normally luminous, and the brightness of light fixture is higher; After the time that process is set reaches, the 19th pin upset of described single-chip microcomputer U1 is high level, this moment, the 1st pin output current of described circuit of power factor correction IC1 can't be through described feedback resistance R14, described diode D5 conducting, promptly there is not electric current to pass through described feedback resistance R14, at this moment, have only described adjustable resistance VR1 that the electric current process is arranged, make described voltage stabilizing circuit 2 export a lower voltage, the brightness of light fixture more normally reduces, therefore, be applied in street lamp, on the light fixture such as garden lamp and corridor lamp, can provide the higher brightness illumination the before midnight people more for a long time, the time after midnight people more after a little while, only need darker lighting effects can reach the effect of guidance lighting, light fixture does not need to remain the highest brightness, thereby reaches the effect of economize on electricity; Certainly, also can be set in when starting working, the lower voltage of described voltage stabilizing circuit 2 outputs is after the time that process is set reaches, provide regularly feedback signal by described timing circuit 8 to described voltage stabilizing circuit 2, make the output voltage raising of described voltage stabilizing circuit 2 reach normal voltage; Above-mentioned principle all is the voltage by timesharing control light fixture, to reach energy-conservation effect.Described LED load 3 comprises one group of several LED that are in series, this is organized described LED and is in series with a described constant-current source device 4, be connected between described output terminals A and the described earth terminal G and constitute the loop, the quantity of the described LED of several that are in series should be looked the voltage V of the output of described voltage stabilizing circuit 2
0, described constant-current source device 4 two ends voltage V
DAnd the conducting voltage V of average each described LED
FAnd decide, the operating voltage of general described constant-current source device 4 is 2～10V, so the number of described LED approximates (V
0-V
D)/V
FThe input terminal voltage of general AC power is an alternating current 220V, after described current rectifying and wave filtering circuit 1 rectification and filtering, become average direct current 300V, after described voltage stabilizing circuit 2 voltage stabilizings of the present utility model, can be changed into constant voltage output 400V, therefore, the ratio that 4 power consumed of described constant-current source device account for entire circuit is very little, and the power-efficient of entire circuit is very high.Certainly, described timing circuit 8 also can adopt other similar circuit, and is not limited to present embodiment.
Depletion mode fet described in the utility model can adopt following method manufacturing:
(1) upper surface with P-type silicon substrate grows the protect oxide layer film at oxidation boiler tube internal heating oxidation, utilizes first reticle to carry out photoetching then on mask aligner, again with containing the corrosive liquid of HF to the etching of described protect oxide layer film;
(2) boron difluoride or the doping of boron ion P type are injected in the described silicon substrate, give high temperature again and drive in, the P+ contact zone that forms the P+ guard ring and contact with described silicon substrate;
(3) on mask aligner, utilize second reticle to carry out photoetching, with dry method etch technology oxide layer is carried out etching again, with ion implantor arsenic ion or phosphonium ion or the two are mixed then and inject described silicon substrate, form the N+ heavily doped region, promptly form N+ source region, N+ drain region and N+ guard ring;
(4) on mask aligner, utilize the 3rd reticle to carry out photoetching, with the corrosive liquid that contains HF the oxide layer of Resistance is carried out etching, form oxide layer with dried oxygen of high temperature or wet oxygen then, inject phosphonium ion then or the boron ion that additionally reinjects, give high temperature again and drive in, finally form N-channel region and oxide layer;
(5) on mask aligner, utilize the 4th reticle to carry out photoetching, with etch process described oxide layer is carried out etching again, form drain electrode through hole, source electrode N+ through hole, substrate P+ through hole;
(6) with the method depositing metal layers of sputter or evaporation, on mask aligner, utilize the metal level lay photoetching mask plate to carry out photoetching then, with dry method or wet etching process metal level is carried out etching again, form drain metal, source metal, gate metal and connect metal.
Present embodiment is by described current rectifying and wave filtering circuit 1, described voltage stabilizing circuit 2 obtains stable voltage output, even described LED load 3 at high temperature works long hours, when its electric current desire increases, described constant-current source device 4 can stop electric current to increase, and described LED load 3 can be added on the described constant-current source device 4 at the voltage that descends under the hot environment work, prolong the useful life of described LED load 3, avoid burning, described constant-current source device 4 is as an independent devices, convenient peripheral voltage stabilizing and the current stabilization circuit of replacing existing other circuit, make circuit element significantly reduce, circuit is simple, can prolong the useful life of load.Described depletion mode fet needs and adjusts at grid, the electric current of the visual LED of saturation current when source electrode is idiostatic, so can provide the constant current supply to LED; Though the output end voltage of described voltage stabilizing circuit 2 is stable, but, since load for a long time under the hot operation condition voltage can descend, the part that this moment, voltage descended will be added between the drain electrode of described depletion mode fet and the source electrode and can not influence LED as load; Simultaneously when output voltage is unstable; particularly be higher than under the situation of normal pressure; exceed voltage segment and will be added between the drain electrode of described depletion mode fet and the source electrode and can not influence LED, so can reach the function of constant current protection LED as load.Therefore, present embodiment can provide the output of voltage and current stabilization simultaneously to load, and is especially suitable for demanding LED load in useful life.As seen the utility model circuit structure is simple, efficient is high, low in energy consumption, energy-conservation, can prolong useful life of light fixture.
Embodiment two:
As shown in Figure 4, the difference of present embodiment and embodiment one is: the LED light fixture of present embodiment also comprises radiator fan, present embodiment also comprises the fan circuit 6 of the radiator fan power supply that is used to the LED light fixture, described LED load 3 comprises four groups of several LED that are in series, every group of described LED all is in series with a described constant-current source device 4, after the series connection four groups again parallel connection make as a whole and described fan circuit 6 and be in series and be connected between described output terminals A and the described earth terminal G, so present embodiment has four described constant-current source devices 4.In the present embodiment, the quantity of the described LED of several that are in series should be looked the voltage V of the output of described voltage stabilizing circuit 2
0, described constant-current source device 4 two ends voltage V
D, described fan circuit 6 two ends voltage V
FanAnd the conducting voltage V of average each described LED
FAnd decide, the operating voltage of general described constant-current source device 4 is 2～10V, the operating voltage of described fan circuit 6 is 5～12V, so the number of described LED approximates (V
0-V
D-V
Fan)/V
FThe input terminal voltage of general AC power is an alternating current 220V, after described current rectifying and wave filtering circuit 1 rectification and filtering, become average direct current 300V, after described voltage stabilizing circuit 2 voltage stabilizings of the present utility model, can be changed into constant voltage output 400V, therefore, the ratio that 6 power consumed of described constant-current source device 4 and described fan circuit account for entire circuit is very little, and the power-efficient of entire circuit is very high.
All the other features of present embodiment are with embodiment one.
Present embodiment is with described fan circuit 6 and described LED load 3, described constant-current source device 4 is in series, when described LED load 3 is worked, simultaneously described fan circuit 6 drives the radiator fan running, carry out active forced ventilation heat radiation, overcome the inadequate natural endowment of passive heat radiation in the prior art, make that the heat radiation collection active heat removal and the passive heat radiation of light fixture are one, improved the radiating effect of LED light fixture greatly, in the LED field of lamp illumination is the innovation of a uniqueness in fact, simultaneously can avoid led chip at high temperature to work, effectively increase the service life, because the existence of forced heat radiation, therefore can dwindle the volume of other metal heat sink, make fitting structure simple, volume is little, excellent in heat dissipation effect, long service life.
Embodiment three:
As shown in Figure 5, the difference of present embodiment and embodiment two is: the described LED load 3 of present embodiment comprises four groups of several LED that are in series, each is organized and remakes as a whole and described constant-current source device 4 after the described LED parallel connection and be in series and be connected between described output terminals A and the described earth terminal G, and promptly present embodiment has only a described constant-current source device 4; In addition, the transformer T1 of the described fan circuit 6 of present embodiment from described voltage stabilizing circuit 2 takes out a tap and provides 5～12V powered by direct current for it, and promptly the described fan circuit 6 of present embodiment separates power supply with described LED load 3, described constant-current source device 4.Equally, the ratio that 6 power consumed of described constant-current source device 4 and described fan circuit account for entire circuit is very little, and the power-efficient of entire circuit is very high.
All the other features of present embodiment are with embodiment two.
LED light fixture of the present utility model can be applicable to open air or indoor lamps such as street lamp, garden lamp and corridor lamp, is particularly suitable for large-power lamp.
The utility model can be widely used in the LED field of light fittings.
Claims (10)
1, a kind of LED light fixture energy-saving control circuit, comprise current rectifying and wave filtering circuit (1), voltage stabilizing circuit (2), LED load (3), alternating current passes through the direct current output that described voltage stabilizing circuit (2) voltage stabilizing becomes constant voltage again and forms output (A) and earth terminal (G) after (1) rectification of described current rectifying and wave filtering circuit and filtering become direct current, it is characterized in that: described LED light fixture energy-saving control circuit also comprises constant-current source device (4), timing circuit (8), described LED load (3), be connected to after described constant-current source device (4) is in series between described output (A) and the described earth terminal (G) and constitute the loop, described timing circuit (8) is connected with described voltage stabilizing circuit (2), be used for providing regularly feedback signal, to change the output voltage of described voltage stabilizing circuit (2) to described voltage stabilizing circuit (2).
2, LED light fixture energy-saving control circuit according to claim 1 is characterized in that: described LED light fixture energy-saving control circuit also comprises the fan circuit (6) of the radiator fan power supply that is used to the LED light fixture.
3, LED light fixture energy-saving control circuit according to claim 2 is characterized in that: described fan circuit (6) and described LED load (3), described constant-current source device (4) are in series and are connected between described output (A) and the described earth terminal (G); Perhaps, described fan circuit (6) takes out powered by direct current from described voltage stabilizing circuit (2).
4, LED light fixture energy-saving control circuit according to claim 2 is characterized in that: described fan circuit (6) comprises fan control module (F1) and shunt resistance (R10), and described fan control module (F1) is in parallel with described shunt resistance (R10).
5, according to claim 1 a described LED light fixture energy-saving control circuit, it is characterized in that: described voltage stabilizing circuit (2) is a Switching Power Supply, and described voltage stabilizing circuit (2) comprises circuit of power factor correction.
6, LED light fixture energy-saving control circuit according to claim 1, it is characterized in that: described constant-current source device (4) is a depletion mode fet, the drain electrode of described depletion mode fet is a contact, and the source electrode of described depletion mode fet and grid short circuit mutually constitute another contact.
7, LED light fixture energy-saving control circuit according to claim 1 is characterized in that: described LED load (3) comprises at least one group of several LED that are in series.
8, LED light fixture energy-saving control circuit according to claim 7, it is characterized in that: every group of described LED all is in series with a described constant-current source device (4), after the series connection some groups again parallel connection do between described output of as a whole access (A) and the described earth terminal (G).
9, LED light fixture energy-saving control circuit according to claim 7 is characterized in that: each is organized and remakes as a whole and described constant-current source device (4) after the described LED parallel connection and be in series.
10, LED light fixture energy-saving control circuit according to claim 1; it is characterized in that: described LED light fixture energy-saving control circuit also comprises short-circuit protection circuit (5), and described short-circuit protection circuit (5) is connected between the input and described current rectifying and wave filtering circuit (1) of AC power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200506268U CN201345763Y (en) | 2009-01-22 | 2009-01-22 | Energy saving control circuit of LED light fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200506268U CN201345763Y (en) | 2009-01-22 | 2009-01-22 | Energy saving control circuit of LED light fixture |
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| Publication Number | Publication Date |
|---|---|
| CN201345763Y true CN201345763Y (en) | 2009-11-11 |
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| CNU2009200506268U Expired - Fee Related CN201345763Y (en) | 2009-01-22 | 2009-01-22 | Energy saving control circuit of LED light fixture |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101478849B (en) * | 2009-01-22 | 2012-05-23 | 广州南科集成电子有限公司 | Energy saving control circuit for LED lamp |
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2009
- 2009-01-22 CN CNU2009200506268U patent/CN201345763Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101478849B (en) * | 2009-01-22 | 2012-05-23 | 广州南科集成电子有限公司 | Energy saving control circuit for LED lamp |
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