CN102548089A - Multi-channel light adjustable light-emitting diode driving power source - Google Patents
Multi-channel light adjustable light-emitting diode driving power source Download PDFInfo
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- CN102548089A CN102548089A CN2010105930831A CN201010593083A CN102548089A CN 102548089 A CN102548089 A CN 102548089A CN 2010105930831 A CN2010105930831 A CN 2010105930831A CN 201010593083 A CN201010593083 A CN 201010593083A CN 102548089 A CN102548089 A CN 102548089A
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Abstract
The invention discloses a multi-channel light adjustable light-emitting diode driving power source which comprises a PFC (Power Factor Correction) module, an LLC (Logic Link Control) module and a BUCK module, wherein the PFC module is used for receiving and inputting an alternating voltage, carrying out power factor correction and outputting a stable direct-current busbar voltage; the LLC module is used for decompressing and isolating the direct-current busbar voltage and outputting a constant low voltage lower than the direct-current busbar voltage; the BUCK module is used for outputting a constant current to an LED (Light Emitting Diode) light source module; the BUCK module adopts an L6562 chip and is used for adjusting a reference voltage through an adjustable resistance, changing a sampling peak current and an output current and adjusting the luminance of the LED light source module. The embodiment of the invention can supply multiple channels for driving the output of the LED light source module and can realize the purpose of adjusting the light of the LED light source module.
Description
Technical field
The present invention relates to the led technology field, particularly relate to a kind of light-emitting diode driving power of multichannel tunable optical.
Background technology
Current China electric power energy is comparatively nervous, and the coal resources storage is limited, and a lot of areas are easy to occur the short phenomenon of supplying power in peak times of power consumption.Electric consumption on lighting accounts for 20% of China's power consumption, therefore aspect electric consumption on lighting, carries out the saving that energy conservation can realize electric power resource effectively.
LED (Light Emitting Diode, light-emitting diode) is a kind of semiconductor device that can directly be converted into electricity visible light.LED is applied to the demonstration of indicator light, numeral and literal the earliest.Along with the appearance of White LED, to have operating voltage low for LED in addition.Little power consumption, the advantage that luminous efficiency is high, the life-span is long, led light source obtains application more and more widely in the general illumination field.Led light source is the luminescent device of a kind of not only energy-conservation but also environmental protection, compares with conventional light source, and the LED lamp is than incandescent lamp power saving 80%, than fluorescent lamp power saving 50%.
At present, for the high-power LED driver, the Switching Power Supply that its great majority all are based on LLC (controlled resonant converter) control extends that design obtains.This led driver adopts the civil power input, and the output of single channel low-voltage direct comes the height of control output voltage through the size of sampling total current, to reach the purpose of constant current.
But, because the high-power LED light source of main flow adopts the series-parallel connection mode to constitute mostly on the present domestic market.When adopting the led driver of prior art; In case certain branch road in the series-parallel connection led light source breaks down; Will certainly influence the operate as normal of the led light source of other each branch roads, quicken the damage of the led light source of other each branch roads even, influence the bulk life time of great power LED.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of light-emitting diode driving power of multichannel tunable optical, the output that can provide multichannel to be used for the driven for emitting lights diode light source module, and can realize purpose to the light modulation of led light source module.
The embodiment of the invention provides a kind of driving power of light-emitting diode, and said driving power comprises: PFC module, LLC module, at least one road BUCK module;
Said PFC module is used to receive input ac voltage, and said input ac voltage is carried out power factor correction, exports stable DC bus-bar voltage;
Said LLC module is used for said DC bus-bar voltage step-down and isolation, and output is lower than the constant low pressure of said DC bus-bar voltage;
Said BUCK module is used for said constant low pressure constant voltage is converted into constant current, exports a paths of LEDs light source module to; Said BUCK module adopts the L6562 chip, through adjustable resistance adjustment reference voltage, changes the sampled peak electric current, changes output current, regulates the brightness of led light source module.
Preferably, said BUCK module comprises:
The negative electrode of one termination, first diode of second electric capacity, another termination inductance of second electric capacity; Another termination the 3rd electric capacity of said inductance, the drain electrode of metal-oxide-semiconductor, the anode of first diode; The other end of said the 3rd electric capacity is connected in series first resistance successively and the 4th resistance arrives ground; The grid of said metal-oxide-semiconductor connects second resistance and the 3rd resistance, and the source electrode of metal-oxide-semiconductor is through the 5th grounding through resistance; Connect the anode of second diode behind the other end short circuit of said second resistance and the 3rd resistance; The negative electrode of said second diode connects the GD pin of chip; The ZCD pin of the public chip termination L6562 of said first resistance and the 4th resistance; First electric capacity two terminates between the negative electrode and ground of first diode; The source electrode of said metal-oxide-semiconductor connects the inverting input of negative feedback operational amplifier and an end of the 5th electric capacity through the 6th resistance; The other end of said the 5th electric capacity connects the output of said negative feedback operational amplifier through the tenth resistance; Output warp the 11 resistance of said negative feedback operational amplifier connects the CS pin of said chip L6562, and the normal phase input end of said negative feedback operational amplifier is through the 7th adjustable resistance and the 8th grounding through resistance; The reference edge of the public termination voltage-stabiliser tube of said the 7th adjustable resistance and the 8th resistance; The negative electrode of said voltage-stabiliser tube connects supply voltage, plus earth through the 9th resistance; The 4th electric capacity is connected between the normal phase input end and ground of said negative feedback operational amplifier.
Preferably, the peripheral circuit of said chip L6562 comprises:
The INV pin of said chip L6562 is through the 12 grounding through resistance; The COMP pin is through the 14 resistance and the 12 grounding through resistance; Said the 13 resistance and the 6th electric capacity and be connected in the INV pin and the COMP pin between; The CS pin is through the 9th capacity earth; The MULT pin is through the 7th capacity earth, and the 16 resistance and the 17 resistance also are connected in the 7th electric capacity two ends; The 15 resistance and be connected in the COMP pin and the MULT pin between; The VCC pin connects working power and the 8th electric capacity, the other end ground connection of said the 8th electric capacity; GND pin ground connection.
Preferably, said driving power also comprises electromagnetic interface filter;
Said electromagnetic interface filter is connected between said PFC module and the input ac voltage, after being used for said input ac voltage carried out High frequency filter and rectification, exports filtered all-wave signal to said PFC module again.
Preferably, said electromagnetic interface filter is the low pass filter of being made up of electric capacity and common mode inductance.
Preferably, said LLC module is soft switch DC-DC isolated buck circuit.
Preferably, said LLC module adopts the two metal-oxide-semiconductor LLC controlled resonant converter circuit based on the L6599 chip controls.
Preferably, said PFC module adopts BOOST under the critical conduction mode of being made up of L6562 chip, metal-oxide-semiconductor, inductance and the diode structure of boosting.
Preferably, the input voltage range of said driving power is AC130V～AC260V, and input voltage is 80%～120% of civil power 220V during steady operation.
Preferably, the loading range of said driving power is 0～90W.
According to specific embodiment provided by the invention, the invention discloses following technique effect:
In the said driving power of the embodiment of the invention, adopt three grades of circuit to constitute, its second level is the LLC module, and its output can connect at least one road BUCK module, and every road BUCK module is used to drive a paths of LEDs light source module.Realized the constant current output that the said driving power of the embodiment of the invention can provide multichannel to be used for the driving LED light source module thus, driven the LED multi-path light source module simultaneously, and can realize dimming function the led light source module.
The said driving power of the embodiment of the invention adopts the civil power input, the output of multichannel low-voltage direct.In sampling primary current and secondary output voltage; Again the electric current of each branch road is sampled; And with the branch current sampled signal, the method that changes the benchmark sampled signal of secondary output voltage through the negative feedback analog computing amplifier is sent into control chip L6562, in the high-power LED light source of string and series-parallel connection; Even a loop open circuit does not return the electric current that causes other loops yet and strengthens; Can not influence the operate as normal in other loops, thereby can not cause light source to extinguish, improve the global reliability of circuit greatly.
Description of drawings
Fig. 1 is the light-emitting diode driving power structure chart of the multichannel tunable optical of the embodiment of the invention;
Fig. 2 is the electromagnetic interface filter circuit diagram of the embodiment of the invention;
Fig. 3 is the circuit diagram of the PFC module of the embodiment of the invention;
Fig. 4 is the circuit structure diagram of the L6562 chip of the embodiment of the invention;
Fig. 5 is the circuit diagram of the LLC module of the embodiment of the invention;
Fig. 6 is the PFM circuit structure diagram of the embodiment of the invention;
Fig. 7 is the BUCK module circuit diagram of the embodiment of the invention.
Embodiment
For make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, below in conjunction with accompanying drawing and embodiment the present invention done further detailed explanation.
In view of this, the object of the present invention is to provide a kind of light-emitting diode driving power of multichannel tunable optical, the output that can provide multichannel to be used for the driven for emitting lights diode light source module, and can realize purpose to the light modulation of led light source module.
With reference to Fig. 1, the light-emitting diode driving power structure chart of the multichannel tunable optical that provides for the embodiment of the invention.Driving power shown in Figure 1 comprises three grades of circuit compositions:
The first order is a PFC module 10, is used to receive input ac voltage, and after said input ac voltage carried out power factor correction, exports stable DC bus-bar voltage to LLC module 20;
The second level is LLC (controlled resonant converter) module 20, is used for the DC bus-bar voltage of input is carried out step-down, and output is lower than the constant low pressure of said DC bus-bar voltage, is sent to BUCK (buck translation circuit) module 30; Simultaneously, said LLC module 20 also plays the effect of isolation, is used to realize the hot side (DC bus-bar voltage) of driving power and the isolation between the step-down side (constant low pressure).
The third level is at least one road BUCK module 30, is used for the said constant low pressure that receives is converted into the required constant current of driving LED light source module 40 work, exports a paths of LEDs light source module 40 to.Said BUCK module 30 adopts the L6562 chip, through adjustable resistance adjustment REF voltage, changes the sampled peak electric current, changes output current, regulates the brightness of led light source module.
In the said driving power of the embodiment of the invention, adopt three grades of circuit to constitute, its second level is LLC module 20, and its output can connect at least one road BUCK module 30, and every road BUCK module 30 is used to drive a paths of LEDs light source module 40.Realized the constant current output that the said driving power of the embodiment of the invention can provide multichannel to be used for driving LED light source module 40 thus, driven LED multi-path light source module 40 simultaneously, and can realize dimming function led light source module 40.
In the embodiment of the invention, said input ac voltage is the 220V civil power, and after the power factor correction of said input ac voltage through PFC module 10, the DC bus-bar voltage of output is generally 400V.This narrow input voltage range helps the employing of second level circuit in the said driving power (LLC module 20) greatly.
Said LLC module 20 is carried out step-down to the DC bus-bar voltage of 400V of input, and the constant low pressure of output 115V can be used to drive the led light source module 40 that multichannel is nominally 0～90W.Among Fig. 1 that the embodiment of the invention provides, be that example describes with 3 paths of LEDs light source modules 40, but among other embodiment of the present invention, said driving power can drive LED multi-path light source module 40, its concrete way can specifically be set according to actual conditions.
Said BUCK module 30 is converted into constant current with the constant low pressure of the 115V that receives, driving LED light source module 40.
The loading range of said driving power is 0～90W.Preferably, when said driving power band 3 paths of LEDs light source modules 40, every paths of LEDs load can be 30W, and at this moment, the total load of said driving power is 90W, for fully loaded.
Need to prove; The said driving power of the embodiment of the invention; Have input overvoltage and input under-voltage protection function, make the permission input voltage range of said driving power can be AC130V～AC260V, input voltage is 80%～120% of a civil power during steady operation.
Said first order PFC module 10 can be guaranteed input ac voltage when AC130V～AC260V fluctuates, and the voltage that is transported to late-class circuit remains on DC400V, makes output do not imported the influence of fluctuation.Simultaneously, during the variation of said second level LLC module 20 in input voltage occurs in DC380V～DC420V scope,, can keep the stable of output voltage through adjusting frequency of adjustment LLC resonant circuit.Thereby make the said driving power of the embodiment of the invention, when AC130V～AC260V stirs, still can keep exporting constant at input ac voltage.
Preferably; The said driving power of the embodiment of the invention; Can also comprise: EMI (Electromagnetic Interference, electromagnetic interference) filter 50, said electromagnetic interface filter is connected between said PFC module 10 and the input ac voltage; After being used for said input ac voltage carried out High frequency filter and rectification, export filtered all-wave signal to said PFC module 10 again.
The high frequency clutter of said electromagnetic interface filter 50 in can the filtering input ac voltage suppresses High-frequency Interference in the AC network to the influence of equipment, simultaneously also suppression equipment to the interference of AC network, thereby guarantee the long-term stability operation of said driving power.
With reference to Fig. 2, be the described electromagnetic interface filter circuit diagram of the embodiment of the invention.Said electromagnetic interface filter 50 is the low pass filter be made up of electric capacity and common mode inductance, can let the useful signal of low frequency pass through smoothly, and High-frequency Interference is had inhibitory action.Wherein, said common mode inductance is meant: two of coilings are around to the inductance that coil constituted opposite, that the number of turn is identical on same magnet ring.
10 pairs of input ac voltages that receive of said PFC module carry out power factor correction, export stable DC bus-bar voltage.Said PFC module 10 can improve the power factor of said driving power, guarantees the High Power Factor input, effectively suppresses the harmonic pollution of driving power to electrical network, realizes truly " green illumination ".Concrete, generally there is not the driving power of PFC correction module, its power factor is about 0.5-0.7, its power factor of driving power of band PFC correction module can reach more than 0.99.
With reference to Fig. 3, be the circuit diagram of the described PFC module of the embodiment of the invention.In the embodiment of the invention, said PFC module 10 adopts the L6562 chip to realize.With reference to Fig. 4, be the circuit structure diagram of the L6562 chip of the embodiment of the invention.L6562 chip circuit shown in Figure 4 is realized being connected with the circuit of PFC module 10 shown in Figure 3 through the second coupling P2.
In the embodiment of the invention, said PFC module 10 adopts: the structure of boosting of the BOOST under the critical conduction mode of being made up of L6562 chip, metal-oxide-semiconductor Q1, inductance L 1 and diode D2.Through L6562 chip controls metal-oxide-semiconductor, export constant DC400V voltage, guarantee the stable operation of late-class circuit.
Circuit shown in Figure 4 is the conventional peripheral circuit of L6562 chip, sets forth no longer in detail at this.
Said LLC module 20 is carried out step-down to the DC bus-bar voltage of 380V～400V of input, and the constant low pressure of output 115V can be used to drive the led light source module 40 that multichannel is nominally DC0V～DC92V.
With reference to Fig. 5, be the circuit diagram of the described LLC module of the embodiment of the invention.In the embodiment of the invention, two metal-oxide-semiconductor LLC controlled resonant converter circuit that said LLC module 20 adopts based on the L6599 chip controls.This L6599 chip and its peripheral circuit constitute PFM (Pulse frequency modulation, pulse frequency modulated) circuit.With reference to Fig. 6, be the PFM circuit structure diagram of the embodiment of the invention.PFM circuit shown in Figure 6 is realized being connected with LLC module 20 circuit shown in Figure 5 through the 3rd coupling P3.
Said LLC module 20 adopts forms the LLC resonance circuit converter by devices such as said PFM circuit, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3, electric capacity, inductance L r1, transformer T3 and diodes; The DC bus-bar voltage of 400V to input carries out step-down, the constant low pressure of output 115V.
In conjunction with Fig. 5 and Fig. 6, said metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q3 have constituted drive circuit, by chip L6599 control, can change the parameter of circuit, change the operating frequency of resonant circuit, thereby realize the adjusting of output voltage.Simultaneously, said chip L6599 provides 50% duty ratio, can make two diode mutual conduction times behind the half-bridge impartial, makes circuit output voltage, power more stable.The L6562 chip that the output voltage of L7815 shown in Fig. 2 is respectively in L6599 chip and the BUCK module 30 provides operating voltage.PC817 and TL431 constitute feedback circuit.
Circuit shown in Figure 6 is the conventional peripheral circuit of L6599 chip, sets forth no longer in detail at this.
Need to prove that in the embodiment of the invention, said LLC module 20 adopts soft switch DC-DC isolated buck circuit.PFC module 10 and the LLC module 20 that the present invention adopts is the mature technology of this area, do not do detailed description at this.The BUCK module 30 that adopts in the face of the embodiment of the invention down describes in detail.
With reference to Fig. 7, the BUCK module circuit diagram that provides for the embodiment of the invention.BUCK module 30 shown in Figure 7 adopts L6562 as control chip, and control metal-oxide-semiconductor Q301 realizes constant current output.
As shown in Figure 5, said chip L6562 has 8 pins, and the function of each pin is described below respectively: pin one (INV pin) is the inverting input of voltage error amplifier and output voltage overvoltage protection input; Pin two (COMP pin) is the output of voltage error amplifier and an input of chip internal multiplier; Pin 3 (MULT pin) is another input of chip internal multiplier; Pin 4 (CS pin) is chip peak current sampling input; Pin 5 (ZCD pin) is inductance L 301 current zero-crossing point test sides; Pin 6 (GND pin) is chip ground, and all signals of chip are reference with this pin all; Pin 7 (GD pin) is the drive signal output pin of metal-oxide-semiconductor Q301, connects the grid of metal-oxide-semiconductor Q301; For avoiding the drive signal vibration of metal-oxide-semiconductor Q301, between the grid of GD pin and metal-oxide-semiconductor Q301, connect diode D302 and parallel resistor R302 and resistance R 303; Pin 8 (VCC pin) is the power pin of chip, is used to connect start-up circuit and power circuit.
Concrete, the said BUCK module 30 of the embodiment of the invention comprises: first capacitor C 301, second capacitor C 302, the 3rd capacitor C 303, the 4th capacitor C 304, the 5th capacitor C 305, the first diode D301, first resistance R 301, second resistance R 302, the 3rd resistance R 303, the 4th resistance R 304, the 5th resistance R S305, the 6th resistance R 306, the 7th adjustable resistance R307, the 8th resistance R 308, the 9th resistance R 309, the tenth resistance R the 310, the 11 resistance R 311, negative feedback operational amplifier U3A, voltage-stabiliser tube TL431.
The negative electrode of one termination, the first diode D301 of said second capacitor C 302, another termination inductance L 501 of second capacitor C 302; Another termination the 3rd capacitor C 303 of said inductance L 501, the drain electrode of metal-oxide-semiconductor Q301, the anode of the first diode D301; The other end of said the 3rd capacitor C 303 is connected in series first resistance R 301 successively and the 4th resistance R 304 arrives ground; The grid of said metal-oxide-semiconductor Q301 connects second resistance R 302 and the 3rd resistance R 303, and the source electrode of metal-oxide-semiconductor Q301 is through the 5th resistance R S305 ground connection; Connect the anode of the second diode D302 behind the other end short circuit of said second resistance R 302 and the 3rd resistance R 303; The negative electrode of the said second diode D302 connects the pin 7 (GD pin) of chip L6562; The pin 5 (ZCD pin) of the public chip termination L6562 of said first resistance R 301 and the 4th resistance R 304; 301 liang of said first capacitor C terminate between the negative electrode and ground of the first diode D301; The source electrode of said metal-oxide-semiconductor Q301 connects the inverting input of negative feedback operational amplifier U3A and an end of the 5th capacitor C 305 through the 6th resistance R 306; The other end of said the 5th capacitor C 305 connects the output of said negative feedback operational amplifier U3A through the tenth resistance R 310; Output warp the 11 resistance R 311 of said negative feedback operational amplifier U3A connects the pin 4 (CS pin) of said chip L6562, and the normal phase input end of said negative feedback operational amplifier U3A is through the 7th adjustable resistance R307 and the 8th resistance R 308 ground connection; The reference edge of the public termination voltage-stabiliser tube TL431 of said the 7th adjustable resistance R307 and the 8th resistance R 308; The negative electrode of said voltage-stabiliser tube TL431 connects supply voltage VCC, plus earth through the 9th resistance R 309; Said the 4th capacitor C 304 is connected between the normal phase input end and ground of said negative feedback operational amplifier U3A.
Wherein, said voltage-stabiliser tube TL431 is the adjustable shunting a reference source of three ends with good thermal stability.Voltage-stabiliser tube TL431 can equivalence be a voltage stabilizing didoe, and the internal reference magnitude of voltage is 2.5V.
The peripheral circuit of said chip L6562 comprises: the 12 resistance R the 312, the 13 resistance R the 313, the 14 resistance R the 314, the 15 resistance R the 315, the 16 resistance R the 316, the 17 resistance R 317, the 6th capacitor C 306, the 7th capacitor C 307, the 8th capacitor C 308, the 9th capacitor C 309.
The pin one of said chip L6562 (INV pin) is through the 12 resistance R 312 ground connection; Pin two (COMP pin) is through the 14 resistance R 314 and the 12 resistance R 312 ground connection; Said the 13 resistance R 313 and the 6th capacitor C 306 and be connected in pin one (INV pin) and pin two (COMP pin) between; Pin 4 (CS pin) is through the 9th capacitor C 309 ground connection; Pin 3 (MULT pin) is through the 7th capacitor C 307 ground connection, and said the 16 resistance R 316 and the 17 resistance R 317 also are connected in said the 7th capacitor C 307 two ends; Said the 15 resistance R 315 and be connected in pin two (COMP pin) and pin 3 (MULT pin) between; Pin 8 (VCC pin) connects working power and the 8th capacitor C 308, the other end ground connection of said the 8th capacitor C 308; Pin 6 (GND pin) ground connection.
In the said BUCK module 30 of the embodiment of the invention; Adopt the L6562 control module; Through regulating said the 7th adjustable resistance R307, adjust reference voltage (be voltage-stabiliser tube TL431 and go up the voltage that produces), thereby change the sampled peak electric current on the 5th resistance R S305; Make output current change, reach dimming function led light source.
Its operation principle is described below:
As shown in Figure 5, start the BUCK module, chip L6562 power supply is normal, driven MOS pipe Q301 conducting.When metal-oxide-semiconductor Q301 conducting, the electric current of inductance L 301 is flowed through metal-oxide-semiconductor Q301 from right to left to ground, progressively increases, and when electric current reached the maximum of setting, said metal-oxide-semiconductor Q301 turn-offed.The conducting of said metal-oxide-semiconductor Q301 all is to be controlled by chip L6562 with turn-offing.
Metal-oxide-semiconductor Q301 closes and has no progeny; Inductance L 301 afterflows; Electric current progressively reduces from right to left; This moment, the electric current of inductance L 301 had two branch roads, and one the tunnel is to reach direct current positive bus through the first diode D301, leaded up to second capacitor C 302 and first resistance R 301 to be coupled to pin 5 (ZCD pin) the formation high level of chip L6562.When electric current on the inductance L 301 was reduced to zero, 5 pin of chip L6562 (ZCD pin) became low level by high level, and trailing edge produces, and made the driving output hopping of chip L6562, metal-oxide-semiconductor Q301 conducting once more.Under the critical conduction mode; LED output average current equals the half the of inductance L 301 peak value sampling electric currents, and its peak value sampling electric current can be confirmed through the voltage that surface sample on the pin two (COMP) of chip L6562 and last voltage of pin 3 (MULT) and the 5th resistance R S305 is obtained.Said peak value sampling electric current compares output through the benchmark of negative feedback operational amplifier U3A and voltage-stabiliser tube TL431, through regulating the 7th adjustable resistance R307, regulates reference voltage output, the change that realizes exporting peak current according to the value difference that is compared.
Wherein, reference voltage Vo=(1+R307/R308) Vref); Vrer=2.5V.
In the existing PFM modulation constant current BUCK module that adopts usually; The general main inductance that adopts adds ancillary coil as energy-storage travelling wave tube; The way of similar high frequency transformer, the pin ZCD of said L6562 chip connects the secondary winding of transformer through resistance, realizes thus the current zero-crossing point of transformer is detected.But, when practical application, different BUCK modules, the actual parameter of the transformer that it needs is inequality.Therefore, in the existing BUCK module, the parameter of its transformer needs design separately, special customization, causes its circuit cost higher and be unfavorable for promoting, and universality is relatively poor.
The said driving power of the embodiment of the invention adopts the input of AC220V civil power, the output of multichannel low-voltage direct.In sampling primary current and secondary output voltage; Again the electric current of each branch road is sampled; And with the branch current sampled signal, the method that changes the benchmark sampled signal of secondary output voltage through negative feedback analog computing amplifier U3A is sent into control chip L6562, in the high-power LED light source of string and series-parallel connection; Even a loop open circuit does not return the electric current that causes other loops yet and strengthens; Can not influence the operate as normal in other loops, thereby can not cause light source to extinguish, improve the global reliability of circuit greatly.
Concrete, as shown in Figure 5, in the embodiment of the invention, adopt inductance L 301 to replace traditional transformer device structure, simultaneously, adopt the mode of second capacitor C, 302 couplings, omitted the secondary winding of traditional transformer.As shown in Figure 5, the pin ZCD of said L6562 chip receives on the inductance L 301 through first resistance R 301 and the 3rd capacitor C 303, has simplified circuit structure thus.Simultaneously, for different BUCK modules, only need the concrete parameter of design suitable inductance L 301, first resistance R 301 and the 3rd capacitor C 303 to get final product.And above-mentioned three kinds of components and parts all are the conventional devices on the market, are easy to satisfy its specification demand, can reduce the circuit cost, are easy to again realize.
Other circuit structures of BUCK module shown in Figure 5 (L6562 chip and peripheral circuit thereof connect method etc.) connect method for the routine of the circuit of existing BUCK module, do not do at this and give unnecessary details.
More than to the driving power of the light-emitting diode of a kind of multichannel tunable optical provided by the present invention; Carried out detailed introduction; Used concrete example among this paper principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, part all can change on embodiment and range of application.In sum, this description should not be construed as limitation of the present invention.
Claims (10)
1. the light-emitting diode driving power of a multichannel tunable optical is characterized in that, said driving power comprises: PFC module, LLC module, at least one road BUCK module;
Said PFC module is used to receive input ac voltage, and said input ac voltage is carried out power factor correction, exports stable DC bus-bar voltage;
Said LLC module is used for said DC bus-bar voltage step-down and isolation, and output is lower than the constant low pressure of said DC bus-bar voltage;
Said BUCK module is used for said constant low pressure constant voltage is converted into constant current, exports a paths of LEDs light source module to; Said BUCK module adopts the L6562 chip, through adjustable resistance adjustment reference voltage, changes the sampled peak electric current, changes output current, regulates the brightness of led light source module.
2. the light-emitting diode driving power of multichannel tunable optical according to claim 1 is characterized in that, said BUCK module comprises:
The negative electrode of one termination, first diode of second electric capacity, another termination inductance of second electric capacity; Another termination the 3rd electric capacity of said inductance, the drain electrode of metal-oxide-semiconductor, the anode of first diode; The other end of said the 3rd electric capacity is connected in series first resistance successively and the 4th resistance arrives ground; The grid of said metal-oxide-semiconductor connects second resistance and the 3rd resistance, and the source electrode of metal-oxide-semiconductor is through the 5th grounding through resistance; Connect the anode of second diode behind the other end short circuit of said second resistance and the 3rd resistance; The negative electrode of said second diode connects the GD pin of chip; The ZCD pin of the public chip termination L6562 of said first resistance and the 4th resistance; First electric capacity two terminates between the negative electrode and ground of first diode; The source electrode of said metal-oxide-semiconductor connects the inverting input of negative feedback operational amplifier and an end of the 5th electric capacity through the 6th resistance; The other end of said the 5th electric capacity connects the output of said negative feedback operational amplifier through the tenth resistance; Output warp the 11 resistance of said negative feedback operational amplifier connects the CS pin of said chip L6562, and the normal phase input end of said negative feedback operational amplifier is through the 7th adjustable resistance and the 8th grounding through resistance; The reference edge of the public termination voltage-stabiliser tube of said the 7th adjustable resistance and the 8th resistance; The negative electrode of said voltage-stabiliser tube connects supply voltage, plus earth through the 9th resistance; The 4th electric capacity is connected between the normal phase input end and ground of said negative feedback operational amplifier.
3. the light-emitting diode driving power of multichannel tunable optical according to claim 2 is characterized in that, the peripheral circuit of said chip L6562 comprises:
The INV pin of said chip L6562 is through the 12 grounding through resistance; The COMP pin is through the 14 resistance and the 12 grounding through resistance; Said the 13 resistance and the 6th electric capacity and be connected in the INV pin and the COMP pin between; The CS pin is through the 9th capacity earth; The MULT pin is through the 7th capacity earth, and the 16 resistance and the 17 resistance also are connected in the 7th electric capacity two ends; The 15 resistance and be connected in the COMP pin and the MULT pin between; The VCC pin connects working power and the 8th electric capacity, the other end ground connection of said the 8th electric capacity; GND pin ground connection.
4. the light-emitting diode driving power of multichannel tunable optical according to claim 1 is characterized in that said driving power also comprises electromagnetic interface filter;
Said electromagnetic interface filter is connected between said PFC module and the input ac voltage, after being used for said input ac voltage carried out High frequency filter and rectification, exports filtered all-wave signal to said PFC module again.
5. the light-emitting diode driving power of multichannel tunable optical according to claim 4 is characterized in that, said electromagnetic interface filter is the low pass filter of being made up of electric capacity and common mode inductance.
6. the light-emitting diode driving power of multichannel tunable optical according to claim 1 is characterized in that, said LLC module is soft switch DC-DC isolated buck circuit.
7. the light-emitting diode driving power of multichannel tunable optical according to claim 1 is characterized in that, said LLC module adopts the two metal-oxide-semiconductor LLC controlled resonant converter circuit based on the L6599 chip controls.
8. the light-emitting diode driving power of multichannel tunable optical according to claim 1 is characterized in that, said PFC module adopts the structure of boosting of the BOOST under the critical conduction mode of being made up of L6562 chip, metal-oxide-semiconductor, inductance and diode.
9. according to the light-emitting diode driving power of each described multichannel tunable optical of claim 1 to 8, it is characterized in that the input voltage range of said driving power is AC130V～AC260V, input voltage is 80%～120% of civil power 220V during steady operation.
10. according to the light-emitting diode driving power of each described multichannel tunable optical of claim 1 to 8, it is characterized in that the loading range of said driving power is 0～90W.
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