CN102548089B - 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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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 LED technology field, particularly relate to a kind of LED driving power of Multipath dimming.
Background technology
Current China electric power energy is comparatively nervous, and coal resources storage is limited, and a lot of areas are easy to the phenomenon that occurs that power supply is short 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) be a kind ofly can directly electricity be converted into the semiconductor device of visible ray.LED is applied to the demonstration of indicator light, numeral and word 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 applying more and more widely in 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 LED lamp is than incandescent lamp power saving 80%, than fluorescent lamp power saving 50%.
At present, for high-power LED driver, its great majority are all based on LLC(controlled resonant converter) the Switching Power Supply extending design controlled obtains.This LED driver, adopts civil power input, and single channel low-voltage direct is exported, and controls the height of output voltage, to reach the object of constant current by the size of sampling total current.
But, because the high-power LED light source of main flow on domestic market adopts series-parallel connection mode to form mostly.When adopting the LED driver of prior art, once certain branch road in series-parallel connection LED light source breaks down, will certainly affect the normal work of the LED light source of other each branch roads, accelerate even the damage of the LED light source of other each branch roads, affect 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 LED driving power of Multipath dimming, can provide multichannel for driving the output of LED light-source module, and can realize the object to the light modulation of LED light source module.
The embodiment of the present invention provides a kind of driving power of light-emitting diode, and described driving power comprises: PFC module, LLC module, at least one road BUCK module;
Described PFC module, for receiving input ac voltage, and carries out power factor correction to described input ac voltage, the DC bus-bar voltage of stable output;
Described LLC module, for to described DC bus-bar voltage step-down and isolation, exports the constant low pressure lower than described DC bus-bar voltage;
Described BUCK module, for described constant constant low pressure is converted into constant current, exports a paths of LEDs light source module to; Described BUCK module, adopts L6562 chip, by adjustable resistance, adjusts reference voltage, changes sampled peak electric current, changes output current, regulates the brightness of LED light source module.
Preferably, described BUCK module comprises:
The negative electrode of one termination the first diode of the second electric capacity, another termination inductance of the second electric capacity; Another termination the 3rd electric capacity of described inductance, the drain electrode of metal-oxide-semiconductor, the anode of the first diode; The other end of described the 3rd electric capacity is connected in series successively the first resistance and the 4th resistance arrives ground; The grid of described metal-oxide-semiconductor connects the second resistance and the 3rd resistance, and the source electrode of metal-oxide-semiconductor is through the 5th grounding through resistance; After the other end short circuit of described the second resistance and the 3rd resistance, connect the anode of the second diode; The negative electrode of described the second diode connects the GD pin of chip; The ZCD pin of the public chip termination L6562 of described the first resistance and the 4th resistance; The first electric capacity two ends are connected between the negative electrode and ground of the first diode; The source electrode of described metal-oxide-semiconductor connects one end of inverting input and the 5th electric capacity of negative feedback operational amplifier through the 6th resistance; The other end of described the 5th electric capacity connects the output of described negative feedback operational amplifier through the tenth resistance; The output of described negative feedback operational amplifier connects the CS pin of described chip L6562 through the 11 resistance, the normal phase input end of described 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 described the 7th adjustable resistance and the 8th resistance; The negative electrode of described 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 described negative feedback operational amplifier.
Preferably, the peripheral circuit of described chip L6562 comprises:
The INV pin of described chip L6562 is through the 12 grounding through resistance; COMP pin is through the 14 resistance and the 12 grounding through resistance; Described the 13 resistance and the 6th Capacitance parallel connection are connected between INV pin and COMP pin; CS pin is through the 9th capacity earth; MULT pin is through the 7th capacity earth, and the 16 resistance and the 17 resistance are also connected in the 7th electric capacity two ends; The 15 resistance and be connected in COMP pin and MULT pin between; VCC pin connects working power and the 8th electric capacity, the other end ground connection of described the 8th electric capacity; GND pin ground connection.
Preferably, described driving power also comprises electromagnetic interface filter;
Described electromagnetic interface filter is connected between described PFC module and input ac voltage, and for described input ac voltage is carried out after High frequency filter and rectification, then the all-wave signal after output filtering is to described PFC module.
Preferably, described electromagnetic interface filter is the low pass filter being comprised of electric capacity and common mode inductance.
Preferably, described LLC module is soft switch DC-DC isolated buck circuit.
Preferably, described LLC module adopts the two metal-oxide-semiconductor LLC controlled resonant converter circuit based on L6599 chip controls.
Preferably, described PFC module adopts BOOST under the critical conduction mode being comprised of L6562 chip, metal-oxide-semiconductor, inductance and the diode structure of boosting.
Preferably, the input voltage range of described driving power is AC130V～AC260V, and during steady operation, input voltage is 80%～120% of civil power 220V.
Preferably, the loading range of described driving power is 0～90W.
According to specific embodiment provided by the invention, the invention discloses following technique effect:
Described in the embodiment of the present invention, in driving power, adopt three grades of circuit to form, its second level is LLC module, and its output can connect at least one road BUCK module, and every road BUCK module is used for driving a paths of LEDs light source module.Realized thus driving power described in the embodiment of the present invention constant current output of multichannel for driving LED light source module can be provided, driven LED multi-path light source module simultaneously, and can realize the dimming function to LED light source module.
Driving power described in the embodiment of the present invention, adopts 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 by branch current sampled signal, the method that changes the benchmark sampled signal of secondary output voltage by negative feedback analog computing amplifier is sent into control chip L6562, in the high-power LED light source of string series-parallel connection, even if also not returning, a loop open circuit do not cause that the electric current in other loops strengthens, can not affect the normal work in other loops, thereby can not cause light source to extinguish, greatly improved the global reliability of circuit.
Accompanying drawing explanation
Fig. 1 is the LED driving power structure chart of the Multipath dimming of the embodiment of the present invention;
Fig. 2 is the electromagnetic interface filter circuit diagram of the embodiment of the present invention;
Fig. 3 is the circuit diagram of the PFC module of the embodiment of the present invention;
Fig. 4 is the circuit structure diagram of the L6562 chip of the embodiment of the present invention;
Fig. 5 is the circuit diagram of the LLC module of the embodiment of the present invention;
Fig. 6 is the PFM circuit structure diagram of the embodiment of the present invention;
Fig. 7 is the BUCK module circuit diagram of the embodiment of the present invention.
Embodiment
For above-mentioned purpose of the present invention, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
In view of this, the object of the present invention is to provide a kind of LED driving power of Multipath dimming, can provide multichannel for driving the output of LED light-source module, and can realize the object to the light modulation of LED light source module.
With reference to Fig. 1, the LED driving power structure chart of the Multipath dimming providing for the embodiment of the present invention.Driving power shown in Fig. 1 comprises three grades of the electric circuit constitutes:
The first order is PFC module 10, for receiving input ac voltage, and described input ac voltage is carried out after power factor correction, and the DC bus-bar voltage of stable output is to LLC module 20;
The second level is LLC(controlled resonant converter) module 20, for the DC bus-bar voltage of input is carried out to step-down, output, lower than the constant low pressure of described DC bus-bar voltage, is sent to BUCK(Buck conversion circuit) module 30; Meanwhile, described LLC module 20 also plays the effect of isolation, for realizing the hot side (DC bus-bar voltage) of driving power and the isolation between step-down side (constant low pressure).
The third level is at least one road BUCK module 30, for the described constant low pressure receiving being converted into the required constant current of driving LED light source module 40 work, exports a paths of LEDs light source module 40 to.Described BUCK module 30, adopts L6562 chip, by adjustable resistance, adjusts REF voltage, changes sampled peak electric current, changes output current, regulates the brightness of LED light source module.
Described in the embodiment of the present invention, in driving power, adopt three grades of circuit to form, 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 for driving a paths of LEDs light source module 40.Realized thus driving power described in the embodiment of the present invention constant current output of multichannel for driving LED light source module 40 can be provided, driven LED multi-path light source module 40 simultaneously, and can realize the dimming function to LED light source module 40.
In the embodiment of the present invention, described input ac voltage is 220V civil power, and described input ac voltage is after the power factor correction of PFC module 10, and the DC bus-bar voltage of output is generally 400V.This narrow input voltage range is conducive to the employing of second level circuit in described driving power (LLC module 20) greatly.
Described LLC module 20, carries out step-down to the DC bus-bar voltage of the 400V of input, and the constant low pressure of output 115V can be for driving multichannel to be nominally the LED light source module 40 of 0～90W.In Fig. 1 that the embodiment of the present invention provides, the 3 paths of LEDs light source modules 40 of take describe as example, but in other embodiments of the invention, described driving power can drive LED multi-path light source module 40, and its concrete way can specifically be set according to actual conditions.
Described BUCK module 30 is converted into constant current by the constant low pressure of the 115V receiving, driving LED light source module 40.
The loading range of described driving power is 0～90W.Preferably, when described driving power band 3 paths of LEDs light source module 40, every paths of LEDs load can be 30W, and now, the total load of described driving power is 90W, for fully loaded.
It should be noted that; driving power described in the embodiment of the present invention; have input overvoltage and input undervoltage defencive function, making the permission input voltage range of described driving power can be AC130V～AC260V, and during steady operation, input voltage is civil power 80%～120%.
Described first order PFC module 10 can guarantee that input ac voltage is when AC130V～AC260V fluctuation, and the voltage that is transported to late-class circuit remains on DC400V, makes output not be subject to the impact of input fluctuation.Meanwhile, during the variation of described second level LLC module 20 within the scope of input voltage occurs in DC380V～DC420V, by adjusting adjusting frequency of LLC resonant circuit, can keep the stable of output voltage.Thereby make driving power described in the embodiment of the present invention, at input ac voltage, when AC130V～AC260V stirs, still can keep exporting constant.
Preferably, driving power described in the embodiment of the present invention, can also comprise: EMI(Electromagnetic Interference, electromagnetic interference) filter 50, described electromagnetic interface filter is connected between described PFC module 10 and input ac voltage, for described input ac voltage is carried out after High frequency filter and rectification, then the all-wave signal after output filtering is to described PFC module 10.
The high frequency clutter of described electromagnetic interface filter 50 in can filtering input ac voltage, suppresses the impact on equipment of High-frequency Interference in AC network, the also interference of suppression equipment to AC network simultaneously, thus guarantee the long-term stability operation of described driving power.
With reference to Fig. 2, it is the electromagnetic interface filter circuit diagram described in the embodiment of the present invention.Described electromagnetic interface filter 50 is a low pass filter being comprised of electric capacity and common mode inductance, can allow the useful signal of low frequency pass through smoothly, and High-frequency Interference is had to inhibitory action.Wherein, described common mode inductance refers to: two inductance that form around the coil to contrary, the number of turn is identical of coiling on same magnet ring.
10 pairs of input ac voltages that receive of described PFC module carry out power factor correction, the DC bus-bar voltage of stable output.Described PFC module 10 can improve the power factor of described driving power, guarantees High Power Factor input, effectively suppresses the harmonic pollution of driving power to electrical network, realizes " green illumination " truly.Concrete, generally, without the driving power of PFC correction module, its power factor is about 0.5-0.7, with its power factor of driving power of PFC correction module, can reach more than 0.99.
With reference to Fig. 3, it is the circuit diagram of the PFC module described in the embodiment of the present invention.In the embodiment of the present invention, described PFC module 10 adopts L6562 chip to realize.With reference to Fig. 4, it is the circuit structure diagram of the L6562 chip of the embodiment of the present invention.The chip circuit of L6562 shown in Fig. 4 is realized and being connected with the circuit of the module of PFC shown in Fig. 3 10 by the second coupling P2.
In the embodiment of the present invention, described PFC module 10 adopts: the structure of boosting of the BOOST under the critical conduction mode being comprised of L6562 chip, metal-oxide-semiconductor Q1, inductance L 1 and diode D2.By L6562 chip controls metal-oxide-semiconductor, export constant DC400V voltage, guarantee the stable operation of late-class circuit.
Circuit shown in Fig. 4 is the conventional peripheral circuit of L6562 chip, at this, no longer elaborates.
Described LLC module 20, carries out step-down to the DC bus-bar voltage of the 380V～400V of input, and the constant low pressure of output 115V can be for driving multichannel to be nominally the LED light source module 40 of DC0V～DC92V.
With reference to Fig. 5, it is the circuit diagram of the LLC module described in the embodiment of the present invention.In the embodiment of the present invention, two metal-oxide-semiconductor LLC controlled resonant converter circuit that described LLC module 20 adopts based on L6599 chip controls.This L6599 chip and its peripheral circuit form PFM(Pulse frequency modulation, pulse frequency modulated) circuit.With reference to Fig. 6, it is the PFM circuit structure diagram of the embodiment of the present invention.The circuit of PFM shown in Fig. 6 is realized and being connected with the module of LLC shown in Fig. 5 20 circuit by the 3rd coupling P3.
Described LLC module 20 adopts and forms LLC resonance circuit converter by devices such as described PFM circuit, metal-oxide-semiconductor Q2, metal-oxide-semiconductor Q3, electric capacity, inductance L r1, transformer T3 and diodes, DC bus-bar voltage to the 400V of input is carried out step-down, the constant low pressure of output 115V.
In conjunction with Fig. 5 and Fig. 6, described metal-oxide-semiconductor Q2 and metal-oxide-semiconductor Q3 have formed drive circuit, and by chip, L6599 controls, and can change the parameter of circuit, changes the operating frequency of resonant circuit, thereby realize the adjusting of output voltage.Meanwhile, described chip L6599 provides 50% duty ratio, can make two diode mutual conduction times after half-bridge impartial, makes circuit output voltage, power more stable.The L6562 chip that the output voltage of L7815 shown in Fig. 3 is respectively in L6599 chip and BUCK module 30 provides operating voltage.PC817 and TL431 form feedback circuit.
Circuit shown in Fig. 6 is the conventional peripheral circuit of L6599 chip, at this, no longer elaborates.
It should be noted that, in the embodiment of the present invention, described LLC module 20 adopts soft switch DC-DC isolated buck circuit.The mature technology that the PFC module 10 that the present invention adopts and LLC module 20 are this area, is not described in detail at this.The BUCK the module 30 below embodiment of the present invention being adopted describes in detail.
With reference to Fig. 7, the BUCK module circuit diagram providing for the embodiment of the present invention.The module of BUCK shown in Fig. 7 30 adopts L6562 as control chip, controls metal-oxide-semiconductor Q301, realizes constant current output.
The module of BUCK shown in Fig. 7 30, it is connected with mainboard by coupling P.Described coupling P comprises 8 pins, wherein: connect+15V of pin one is chip L6562 power supply; Pin two and 3 ground connection; Pin 4 and 5 connects the positive input terminal of LED light source module; Pin 6 and 7 connects the negative input end of LED light source module; Pin 8 is unsettled.
As shown in Figure 7, described chip L6562 has 8 pins, and the function of each pin is as described below respectively: pin one (INV pin) is inverting input and the output voltage overvoltage protection input of voltage error amplifier; Pin two (COMP pin) is the output of voltage error amplifier and an input of chip internal multiplier; Pin 3(MULT pin) be another input of chip internal multiplier; Pin 4(CS pin) be chip peak current sampling input; Pin 5(ZCD pin) be inductance L 301 current zero-crossing point test sides; Pin 6(GND pin) be chip ground, all signals of chip all be take this pin as reference; Pin 7(GD pin) be the driving signal output pin of metal-oxide-semiconductor Q301, connect the grid of metal-oxide-semiconductor Q301; For avoiding the driving signal oscillating of metal-oxide-semiconductor Q301, between the grid of GD pin and metal-oxide-semiconductor Q301, connect diode D302 and resistance R 302 and resistance R 303 in parallel; Pin 8(VCC pin) be the power pin of chip, for connecing start-up circuit and power circuit.
Concrete, BUCK module 30 comprises described in the embodiment of the present invention: the first capacitor C 301, the second capacitor C 302, the 3rd capacitor C 303, the 4th capacitor C 304, the 5th capacitor C 305, the first diode D301, the first resistance R 301, the 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 described the second capacitor C 302, another termination inductance L 301 of the second capacitor C 302; Another termination the 3rd capacitor C 303 of described inductance L 301, the drain electrode of metal-oxide-semiconductor Q301, the anode of the first diode D301; The other end of described the 3rd capacitor C 303 is connected in series successively the first resistance R 301 and the 4th resistance R 304 arrives ground; The grid of described metal-oxide-semiconductor Q301 connects the 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; After the other end short circuit of described the second resistance R 302 and the 3rd resistance R 303, connect the anode of the second diode D302; The negative electrode of described the second diode D302 connects the pin 7(GD pin of chip L6562); The pin 5(ZCD pin of the public chip termination L6562 of described the first resistance R 301 and the 4th resistance R 304); 301 liang of ends of described the first capacitor C are connected between the negative electrode and ground of the first diode D301; The source electrode of described metal-oxide-semiconductor Q301 connects the inverting input of negative feedback operational amplifier U3A and one end of the 5th capacitor C 305 through the 6th resistance R 306; The other end of described the 5th capacitor C 305 connects the output of described negative feedback operational amplifier U3A through the tenth resistance R 310; The output of described negative feedback operational amplifier U3A connects the pin 4(CS pin of described chip L6562 through the 11 resistance R 311), the normal phase input end of described 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 described the 7th adjustable resistance R307 and the 8th resistance R 308; The negative electrode of described voltage-stabiliser tube TL431 connects supply voltage VCC, plus earth through the 9th resistance R 309; Described the 4th capacitor C 304 is connected between the normal phase input end and ground of described negative feedback operational amplifier U3A.
Wherein, described voltage-stabiliser tube TL431 is the three end adjustable shunt reference sources with good thermal stability.Voltage-stabiliser tube TL431 can be equivalent to a voltage stabilizing didoe, and internal reference magnitude of voltage is 2.5V.
The peripheral circuit of described 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 described 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; Described 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) through the 9th capacitor C 309 ground connection; Pin 3(MULT pin), through the 7th capacitor C 307 ground connection, described the 16 resistance R 316 and the 17 resistance R 317 are also connected in described the 7th capacitor C 307 two ends; Described the 15 resistance R 315 is also connected in pin two (COMP pin) and pin 3(MULT pin) between; Pin 8(VCC pin) connect working power and the 8th capacitor C 308, the other end ground connection of described the 8th capacitor C 308; Pin 6(GND pin) ground connection.
Described in the embodiment of the present invention in BUCK module 30, adopt L6562 control module, by regulating described the 7th adjustable resistance R307, adjust reference voltage (being the upper voltage producing of voltage-stabiliser tube TL431), thereby change the sampled peak electric current on the 5th resistance R S305, output current is changed, reach the dimming function to LED light source.
Its operation principle is as described below:
As shown in Figure 7, start 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 reaches the maximum of setting, described metal-oxide-semiconductor Q301 turn-offs.The turn-on and turn-off of described metal-oxide-semiconductor Q301 are all to be controlled by chip L6562.
Metal-oxide-semiconductor Q301 closes and has no progeny, inductance L 301 afterflows, electric current progressively reduces from right to left, now the electric current of inductance L 301 has two branch roads, one tunnel is to reach direct current positive bus by the first diode D301, leads up to the second capacitor C 302 and the first resistance R 301 to be coupled to the pin 5(ZCD pin of chip L6562) form high level.When in inductance L 301, electric current is reduced to zero, 5 pin of chip L6562 (ZCD pin) become low level by high level, and trailing edge produces, and makes the driver output saltus step of chip L6562, metal-oxide-semiconductor Q301 conducting again.Under critical conduction mode, LED output average current equals half of inductance L 301 peak value sampling electric currents, and its peak value sampling electric current can be by the pin two of chip L6562 (COMP) and pin 3(MULT) go up the voltage that on voltage and the 5th resistance R S305, surface sample obtains and determine.Described peak value sampling electric current compares output through the benchmark of negative feedback operational amplifier U3A and voltage-stabiliser tube TL431, and by regulating the 7th adjustable resistance R307, adjusting reference voltage output, realizes the change of output peak current according to compared value difference.
Wherein, reference voltage Vo=(1+R307/R308) Vref); Vref=2.5V.
In the PFM modulation constant current BUCK module of existing common employing, 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 described L6562 chip connects the secondary winding of transformer by resistance, realize 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 not identical.Therefore, in existing BUCK module, the parameter of its transformer needs design separately, customization especially, causes its circuit cost higher and be unfavorable for promoting, and universality is poor.
Driving power described in the embodiment of the present 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 by branch current sampled signal, the method that changes the benchmark sampled signal of secondary output voltage by negative feedback analog computing amplifier U3A is sent into control chip L6562, in the high-power LED light source of string series-parallel connection, even if also not returning, a loop open circuit do not cause that the electric current in other loops strengthens, can not affect the normal work in other loops, thereby can not cause light source to extinguish, greatly improved the global reliability of circuit.
Concrete, as shown in Figure 7, in the embodiment of the present invention, adopt inductance L 301 to replace traditional transformer device structure, meanwhile, adopt the mode of the second capacitor C 302 couplings, omitted the secondary winding of traditional transformer.As shown in Figure 7, the pin ZCD of described L6562 chip receives in inductance L 301 by the first resistance R 301 and the 3rd capacitor C 303, has simplified thus circuit structure.Meanwhile, for different BUCK modules, only need the design parameter of suitable inductance L 301, the first resistance R 301 and the 3rd capacitor C 303 of design.And above-mentioned three kinds of components and parts are all the conventional devices on market, be easy to meet its specification demands, can reduce circuit cost, be easy to again realize.
Other circuit structures of the module of BUCK shown in Fig. 7 (L6562 chip and peripheral circuit connection thereof etc.) are the conventional connection of the circuit of existing BUCK module, at this, do not repeat.
Driving power to the light-emitting diode of a kind of Multipath dimming provided by the present invention above, be described in detail, applied specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment is just for helping to understand method of the present invention and core concept thereof; Meanwhile, for one of ordinary skill in the art, according to thought of the present invention, all will change in specific embodiments and applications.In sum, this description should not be construed as limitation of the present invention.
Claims (9)
1. a LED driving power for Multipath dimming, is characterized in that, described driving power comprises: PFC module, LLC module, at least one road BUCK module;
Described PFC module, for receiving input ac voltage, and carries out power factor correction to described input ac voltage, the DC bus-bar voltage of stable output;
Described LLC module, for to described DC bus-bar voltage step-down and isolation, exports the constant low pressure lower than described DC bus-bar voltage;
Described BUCK module, for described constant constant low pressure is converted into constant current, exports a paths of LEDs light source module to; Described BUCK module, adopts L6562 chip, by adjustable resistance, adjusts reference voltage, changes sampled peak electric current, changes output current, regulates the brightness of LED light source module;
Described BUCK module comprises:
The negative electrode of one termination the first diode of the second electric capacity, another termination inductance of the second electric capacity; Another termination the 3rd electric capacity of described inductance, the drain electrode of metal-oxide-semiconductor, the anode of the first diode; The other end of described the 3rd electric capacity is connected in series successively the first resistance and the 4th resistance arrives ground; The grid of described metal-oxide-semiconductor connects the second resistance and the 3rd resistance, and the source electrode of metal-oxide-semiconductor is through the 5th grounding through resistance; After the other end short circuit of described the second resistance and the 3rd resistance, connect the anode of the second diode; The negative electrode of described the second diode connects the GD pin of described chip L6562; The ZCD pin of chip L6562 described in the public termination of described the first resistance and the 4th resistance; The first electric capacity two ends are connected between the negative electrode and ground of the first diode; The source electrode of described metal-oxide-semiconductor connects one end of inverting input and the 5th electric capacity of negative feedback operational amplifier through the 6th resistance; The other end of described the 5th electric capacity connects the output of described negative feedback operational amplifier through the tenth resistance; The output of described negative feedback operational amplifier connects the CS pin of described chip L6562 through the 11 resistance, the normal phase input end of described 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 described the 7th adjustable resistance and the 8th resistance; The negative electrode of described 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 described negative feedback operational amplifier.
2. the LED driving power of Multipath dimming according to claim 1, is characterized in that, the peripheral circuit of described chip L6562 comprises:
The INV pin of described chip L6562 is through the 12 grounding through resistance; COMP pin is connected in series successively the 14 resistance and the 12 resistance arrives ground; Described the 13 resistance and the 6th Capacitance parallel connection are connected between INV pin and COMP pin; CS pin is through the 9th capacity earth; MULT pin is through the 7th capacity earth, and the 16 resistance and the 17 resistance are also connected in the 7th electric capacity two ends; The 15 resistance and be connected in COMP pin and MULT pin between; VCC pin connects working power and the 8th electric capacity, the other end ground connection of described the 8th electric capacity; GND pin ground connection.
3. the LED driving power of Multipath dimming according to claim 1, is characterized in that, described driving power also comprises electromagnetic interface filter;
Described electromagnetic interface filter is connected between described PFC module and input ac voltage, and for described input ac voltage is carried out after High frequency filter and rectification, then the all-wave signal after output filtering is to described PFC module.
4. the LED driving power of Multipath dimming according to claim 3, is characterized in that, described electromagnetic interface filter is the low pass filter being comprised of electric capacity and common mode inductance.
5. the LED driving power of Multipath dimming according to claim 1, is characterized in that, described LLC module is soft switch DC-DC isolated buck circuit.
6. the LED driving power of Multipath dimming according to claim 1, is characterized in that, described LLC module adopts the two metal-oxide-semiconductor LLC controlled resonant converter circuit based on L6599 chip controls.
7. the LED driving power of Multipath dimming according to claim 1, is characterized in that, described PFC module adopts the structure of boosting of the BOOST under the critical conduction mode being comprised of L6562 chip, metal-oxide-semiconductor, inductance and diode.
8. according to the LED driving power of the Multipath dimming described in claim 1 to 7 any one, it is characterized in that, the input voltage range of described driving power is AC130V～AC260V, and during steady operation, input voltage is 80%～120% of civil power 220V.
9. according to the LED driving power of the Multipath dimming described in claim 1 to 7 any one, it is characterized in that, the loading range of described driving power is 0～90W.
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| CN201010593083.1A CN102548089B (en) | 2010-12-16 | 2010-12-16 | Multi-channel light adjustable light-emitting diode driving power source |
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| CN102740525B (en) * | 2012-07-13 | 2014-08-13 | 木林森股份有限公司 | Constant current power supply of HV-LED lamp without electrolytic capacitor and integrated circuit |
| CN103582227A (en) * | 2012-08-09 | 2014-02-12 | 深圳市海洋王照明工程有限公司 | Dimming control circuit and lamp |
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