CN202396031U - Lighting LED driver - Google Patents
Lighting LED driver Download PDFInfo
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- CN202396031U CN202396031U CN2011204228381U CN201120422838U CN202396031U CN 202396031 U CN202396031 U CN 202396031U CN 2011204228381 U CN2011204228381 U CN 2011204228381U CN 201120422838 U CN201120422838 U CN 201120422838U CN 202396031 U CN202396031 U CN 202396031U
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Abstract
The utility model discloses a lighting LED driver comprising an AC (alternating current)/DC (direct current) module and a constant-current control module, wherein the AC/DC module uses an LLC resonant transformation topological structure for transform AC electric supply to low voltage DC; and the constant-current control module is connected with the AC/DC module for using the low voltage DC as the driving voltage to output the constant current so as to realize that the constant current drives the LED light source. The lighting LED driver can realize the constant-current driving of the lighting LED and at the same time maintain the safety and reliability.
Description
Technical field
The utility model relates to the electron trade technical field of semiconductor illumination, relates in particular to a kind of illuminating LED driver.
Background technology
White light LEDs is long because of its life-span, and outstanding advantage such as energy-conservation grade is called as " new light sources of 21 century ", owing to have long, characteristics such as start-up time is short, nothing is ultraviolet, rich color is full, low-voltage safety of life-span, is particularly suitable for the high-power illumination field in addition.
Survey, research and analysis through to great power LED driven product on the domestic market is found; Present most of great power LED driven product all adopts the constant voltage mode to drive; This type of drive receives the restriction of LED compound mode, need confirm the output voltage of driver according to the different combinations mode.
To the characteristics that LED drives, desirable LED type of drive is a constant-current driving, and this type of drive has two advantages: one of which, avoid drive current to exceed maximum rating, influence its reliability; The brightness requirement that two, can obtain to expect, and guarantee the consistency of each LED brightness, colourity.
Use the led driver of constant current drive mode at present, like patent CN200910098882.9, it can't be regulated output current, can't realize constant-current driving, also can't guarantee the power factor and the operating efficiency of driver.
The utility model content
The technical problem that (one) will solve
For solving above-mentioned one or more problems, the utility model provides a kind of illuminating LED driver, to realize the constant-current driving of illuminating LED, keeps its fail safe and reliability simultaneously.
(2) technical scheme
An aspect according to the utility model provides a kind of illuminating LED driver.This led driver comprises: adopt the AC/DC module of LLC resonant transformation topological structure, it becomes low-voltage DC with electric main; And the constant current control module that is connected with the AC/DC module, it exports constant current with low-voltage DC as driving voltage, to realize the constant-current driving LED light source.
Preferably, in the utility model illuminating LED driver, the AC/DC module comprises: em filtering and input rectification circuit, and it carries out rectification to electric main; The PFC circuit of power factor correction that is connected with em filtering and input rectification circuit, the electric current of exporting behind its adjustment process em filtering and the input rectification circuit and the phase difference of voltage boost to predetermined voltage with the direct voltage after the rectification simultaneously; The LLC resonant control circuit that is connected with the PFC circuit of power factor correction; Its with the output voltage of PFC circuit of power factor correction as input voltage; The control switch device is implemented in opening or turn-offing under no-voltage and the zero current condition; Direct voltage is converted into square-wave voltage exports the primary end to, export output rectification and filter circuit to via the transformer secondary output end again; The output rectification and the filter circuit that are connected with the transformer secondary output end, it will carry out rectification and filtering through the voltage of transformer secondary output end output, and the output galvanic current is pressed and is used to drive the constant current control module; With the feedback control loop that output rectification and filter circuit are connected, it feeds back to master controller through the output voltage variable quantity of gathering output rectification and filter circuit; And, the master controller that is connected with feedback control loop, its voltage variety according to feedback is adjusted the output frequency of LLC resonant control circuit.
Preferably, in the utility model illuminating LED driver, em filtering and input rectification circuit comprise fuse (F1), piezo-resistance (RV1), thermistor (RT1); First electric capacity (C1), the 3rd electric capacity (C3), the 4th electric capacity (C4), the 7th electric capacity (C7); Inductance (L1), first resistance (R1), second resistance (R2), the 3rd resistance (R3); The 6th resistance (R6), the 8th resistance (R8), the 3rd diode (D3), the 4th diode (D4) and rectifier bridge (BD1); Wherein, the positive pole of the input termination power of fuse (F1) input, output termination piezo-resistance (RV1), an end of thermistor (RT1); Thermistor (RT1) connects the positive pole of the 3rd electric capacity (C3), and thermistor (RV1) connects the negative pole of the 3rd electric capacity (C3); The input of two output termination inductance (L1) of the 3rd electric capacity (C3); The positive pole of inductance output connects first electric capacity (C1), another termination the 5th electric capacity (C5) of first electric capacity (C1), the negative pole of another termination inductance (L1) of the 5th electric capacity (C5); The anodal connecting resistance (R1) of first electric capacity (C1), another termination second resistance (R2) of resistance (R1), another termination the 3rd resistance (R3) of second resistance (R2), the negative pole of another termination inductance of the 3rd resistance (R3); First resistance (R1) connects the positive pole of the 4th electric capacity (C4), and the negative pole of the 4th electric capacity (C4) connects the negative pole of inductance, and the 4th electric capacity (C4) connects rectifier bridge (DB1) positive pole, and rectification bridge output end connects the 7th electric capacity (C7) and PFC control circuit; The positive pole of another termination the 8th resistance (R8) of the 7th electric capacity (C7) and the 6th resistance (R6) and the 4th diode (D4); The negative pole of the 4th diode (D4) connects the positive pole of the 3rd diode (D3), and the negative pole of the 3rd diode (D3) connects master controller.
Preferably, in the utility model illuminating LED driver, thermistor (RT1) is used for limit inrush currents, and piezo-resistance (RV1) is used to limit surge voltage.
Preferably, in the utility model illuminating LED driver, the PFC circuit of power factor correction comprises the 7th resistance (R7), the 9th resistance (R9); The 44 resistance (R44), the 9th electric capacity (C9), the tenth electric capacity (C10), the 40 electric capacity (C40); First diode (D1), second diode (D2), first triode (Q1); The 3rd triode (Q3), second switch pipe (Q2), the 4th inductance (L4); Wherein, the positive pole of first diode (D1) connects the input of the 4th inductance (L4), the output termination power control circuit of the 4th inductance (L4); The negative pole of first diode (D1) connects the negative pole of second diode (D2), the 9th electric capacity (C9) positive pole, the 40 electric capacity (C40); Second diode (D2) positive pole connects second switch pipe (Q2) output; Master controller connects the 44 resistance (R44); Another termination the 9th resistance (R9) of the 44 resistance (R44), the input of first triode (Q1), the 3rd triode (Q3); The tenth electric capacity (C10) connects the output of first triode (Q1), the tenth electric capacity (C10) another termination the 9th resistance (R9) and ground wire; Output termination the 7th resistance (R7) of the 3rd triode (Q3), the input of input (Q2).
Preferably, in the utility model illuminating LED driver, in normal working conditions, the PFC circuit of power factor correction is with continuous conduction mode work; Under the underloading condition, when the inductance of PFC circuit of power factor correction satisfies when pre-conditioned, transducer gets into discontinuous conduction mode.
Preferably, in the utility model illuminating LED driver, the LLC resonant control circuit comprises: the 56 resistance (R56), the 58 resistance (R58); The 59 resistance (R59), the 40 electric capacity (C40), the 39 electric capacity (C39), the 6th safety electric capacity (CX6); The 20 diode (D20), the 19 diode (D19), the tenth switching tube (Q10), the 11 switching tube (Q11); The 6th magnetic bead (L6), the 7th magnetic bead (L7), transformer (T); Wherein, the 40 electric capacity (C40) two terminations the tenth switching tubes (Q10), the output of the 11 switching tube (Q11); Master controller connects the 56 resistance (R56), the 6th inductance (L6), the 58 resistance (R58), an end of the 7th magnetic bead (L7); The input of another termination the tenth switching tube (Q10) of the 56 resistance (R56), the negative pole of the 20 diode (D20); The positive pole of the 20 diode (D20) connects the 6th inductance (L6), the output of the tenth switching tube (Q10); The 58 resistance (R58) connects the negative pole of diode and the input of the 11 switching tube (Q11); The 19 diode (D19) positive pole connects the output of the 7th inductance (L7) and the 11 switching tube (Q11); Output termination the 9th electric capacity (C39) of the tenth switching tube (Q10); Another termination transformer (T) primary side 3 pins of the 39 electric capacity (C39); Transformer (T) primary side 2 pins connect the 59 resistance (R59); Another termination the 6th safety electric capacity (CX6) of the 59 resistance (R59), another termination feedback control loop of the 6th safety electric capacity (CX6).
Preferably, in the utility model illuminating LED driver, the tenth switching tube (Q10) and the 11 switching tube (Q11) form the LLC half-bridge and directly drive through resistance (R56 and R58); The 39 electric capacity (C39) is primary resonant electric capacity, and its rated value is allowed the highest RMS electric current when maximum load occurring; Transformer (T) and the 39 electric capacity (C39) acting in conjunction form series resonant tank; The 40 electric capacity (C40) is used for local bypass; The 59 resistance (R59) detects the primary current of controller so that overload protection to be provided.
Preferably, in the utility model illuminating LED driver, feedback control loop comprises: the 30 resistance (R30), the 54 resistance (R54); The 66 resistance (R66), the 67 resistance (R67), the 70 resistance (R70), the 107 resistance (R107); The 24 electric capacity (C24), the 41 electric capacity (C41), the 44 electric capacity (C44); The 51 electric capacity (C51), the 68 electric capacity (C68), the 77 electric capacity (C77); Potentiometer (RVT), pressurizer (U3), second optocoupler (U2); Wherein, the positive pole of the 41 electric capacity (C41) connects the 66 resistance (R66), the 30 resistance (R30), the 107 resistance (R107), the 66 (R66); Another termination potentiometer (RVT) of the 66 resistance (R66); Another termination the 24 electric capacity (C24) of potentiometer (RVT), the 67 resistance (R67), the 3rd optocoupler (U3) positive pole; Another termination the 44 electric capacity (C44) of the 24 electric capacity (C24), the 70 resistance (R70); Pressurizer (U3) negative pole connects the 68 electric capacity (C68), diode (VR12) positive pole; Diode (VR12) negative pole connects the 60 resistance (R60), second optocoupler (U2) input; Second optocoupler (U2) output termination the 54 resistance (R54), the 77 electric capacity (C77), master controller.
Preferably, in the utility model illuminating LED driver, the constant current control module comprises: the 80 resistance (R80), the 81 resistance (R81); The 82 resistance (R82), the 83 resistance (R83), the 84 resistance (R84), the 80 electric capacity (C80); The 81 electric capacity (C81), the 82 electric capacity (C82), the 83 electric capacity (C83), the 84 electric capacity (C84); The 85 electric capacity (C85), second inductance (L2), the 5th diode (D5); The 4th switching tube (Q4), the 5th switching tube (Q5), constant-current controller (U4); Wherein, the 80 resistance (R80) connects the 82 resistance (R82), the 4th constant-current controller (U4); Another termination the 81 electric capacity (C81) of the 82 resistance (R82), the 4th constant-current controller (U4); The 83 resistance (R83) connects the 4th constant-current controller (U4); The 84 resistance (R84), the 84 electric capacity (C84) connects the 4th constant-current controller (U4); The 81 resistance (R81), the 80 electric capacity (C80) connects the 4th constant-current controller (U4); The 82 electric capacity (C82) connects the 4th constant-current controller (U4); The 4th switching tube (Q4), the 5th switching tube (Q5) connects constant-current controller (U4); The 5th diode (D5) connects second inductance (L2), the 85 electric capacity (C85), the 83 electric capacity (C83).
Preferably, in the utility model illuminating LED driver, the 4th switching tube (Q4), the 5th switching tube (Q5) is the P-channel field-effect transistor (PEFT) pipe.
(3) beneficial effect
Integral body is made up of AC/DC module and constant current control module in the utility model two functional modules.Wherein the AC/DC module adopts the LLC resonant transformation topological structure of high conversion efficiency; Mainly comprise em filtering and input rectification circuit, PFC circuit of power factor correction, LLC resonant control circuit, output rectification and filter circuit, feedback control loop, six parts such as master controller.Constant flow module is made up of constant current control chip and peripheral circuit.The utility model illuminating LED driver has following beneficial effect:
(1) efficiency losses of generic drive is influenced by switching device mainly, and efficient largely consumes on switching device.The utility model AC/DC module has adopted LLC resonant transformation topological structure to utilize the LLC resonant control circuit to realize that the alternate conduction of control switch device realizes no-voltage; Opening and turn-offing under the zero current condition, thus the loss control of switching device has been improved conversion efficiency in the degree of minimum;
(2) the utility model has partly adopted the PFC circuit of power factor correction at AC/DC.This circuit can carry out phase adjusted to alternating current, the voltage of input, makes the phase place of electric current and voltage keep constantly synchronously, thereby has improved power factor;
(3) the utility model AC/DC module master controller has PFC switching frequency controlled function, the alternating voltage of input less than or can regulate the PFC switching frequency during greater than scheduled voltage, make voltage can be adjusted to predetermined value.So can make the driver operate as normal increase the scope of input ac voltage within the specific limits at input voltage like this;
(4) the utility model has adopted the constant current control module, and this module adopts (COFT) regulating and controlling mechanism of constant turn-off time, can regulate electric current accurately and need not the external control loop compensation.
The utility model has high efficiency, High Power Factor, high current precision, wide input voltage range and perfect technique effects such as defencive function based on above-mentioned technical characterictic.
Description of drawings
Fig. 1 is the circuit diagram of driver electromagnetism filtering of the utility model embodiment illuminating LED and input rectification circuit;
Fig. 2 is the circuit diagram of the utility model embodiment illuminating LED driver PFC circuit of power factor correction;
Fig. 3 is the circuit diagram of the utility model embodiment illuminating LED driver LLC resonant control circuit;
Fig. 4 is the circuit diagram of the utility model embodiment illuminating LED driver feedback control loop;
Fig. 5 is the circuit diagram of the utility model embodiment illuminating LED driver constant current control module.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model is clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, to the utility model further explain.Though this paper can provide the demonstration of the parameter that comprises particular value, should be appreciated that parameter need not definitely to equal corresponding value, but can in acceptable error margin or design constraint, be similar to said value.
The utility model is the illuminating LED driver, and its overall structure mainly is made up of two functional modules: AC/DC (ac/dc conversion) module, constant current control module.The AC/DC major function can supply to drive the low-voltage DC that constant flow module uses for electric main is converted into.Constant current control module major function be constant current is provided for led driver output with the driving LED light source.Mainly comprising of AC/DC module: magnetic filtering and input rectification circuit, PFC (power factor correction) circuit of power factor correction, LLC (series resonant circuit) resonant control circuit, feedback control loop, master controller.
Fig. 1 is the circuit diagram of driver electromagnetism filtering of the utility model embodiment illuminating LED and input rectification circuit.As shown in Figure 1, em filtering and input rectification circuit comprise fuse F1, piezo-resistance RV1, thermistor RT1.Capacitor C 1, C3, C4, C7.Inductance L 1, resistance R 1, R2, R3, R6, R8, diode D3, D4, rectifier bridge BD1.
Wherein, the positive pole of the input termination power of fuse (F1) input, output termination piezo-resistance RV1, an end of thermistor (RT1); Thermistor (RT1) connects the positive pole of electric capacity (C3), and thermistor (RV1) connects the negative pole of electric capacity (C3); The input of two output termination inductance (L1) (C3); The positive pole of inductance output connects electric capacity (C1), another termination capacitor (C5) of electric capacity (C1), the negative pole of another termination inductance (L1) of electric capacity (C5); The anodal connecting resistance (R1) of electric capacity (C1), the other end connecting resistance (R2) of resistance (R1), the other end connecting resistance (R3) of resistance (R2), the negative pole of another termination inductance of resistance (R3); Resistance (R1) connects the positive pole of electric capacity (C4), and the negative pole of electric capacity (C4) connects the negative pole of inductance, and electric capacity (C4) connects rectifier bridge (DB1) positive pole, and rectification bridge output end connects electric capacity (C7) and PFC control circuit; (R8 is R6) with the positive pole of diode (D4) for another termination of electric capacity (C7); The negative pole of diode (D4) connects the positive pole of diode (D3), and the negative pole of diode (D3) connects master controller.
Thermistor (RT1) is used for limit inrush currents; The electric energy of resistance consumption increased when its principle was the electric current increase, heating then, and the resistance change of heating back thermistor is big; It is big that resistance becomes; RT1 can share more voltage, and when whole loop turned back to original state, resistance cooling resistance just returned to initial condition.
Piezo-resistance (RV1) is used to limit surge voltage, and the maximum characteristics of piezo-resistance are the voltage above being added in it when being lower than its threshold values UN, and the electric current that flows through it is minimum; Be equivalent to one and close dead valve; When voltage surpassed UN, the electric current that flows through it increased sharply, and is equivalent to valve open.
Em filtering and input rectification circuit use bridge diode, thermistor and piezo-resistance.In the said structure, bridge diode carries out rectification and independent full wave rectified signal is provided the direct current of input; Thermistor is used for limit inrush currents; Piezo-resistance is used to limit surge voltage, suppresses the frequent abnormal overvoltage that occurs in the circuit to reach, and protective circuit is avoided superpotential infringement, reaches overvoltage protection, requirements such as anti-thunderbolt.
Fig. 2 is the circuit diagram of the utility model embodiment illuminating LED driver PFC circuit of power factor correction.As shown in Figure 2, the structure of PFC circuit of power factor correction, the PFC circuit of power factor correction is a boost converter, is used to regulate average current input, generally, this structure makes it become sinusoidal variations with input voltage and keeps homophase with input voltage.In the said structure, in normal working conditions, pfc circuit is worked with continuous conduction mode (CCM).Under the underloading condition, look the inductance value of pfc circuit and decide, transducer possibly get into discontinuous conduction mode (DCM) when inductance gets into saturation condition.In this structure, the non-essential resistance voltage divider detects the PFC output voltage, and purpose is that the required DC of reduction boosts so that conform to the reference voltage of inside generation.
Wherein, the positive pole of diode (D1) connects the input of (L4), output termination power control circuit (L4); The negative pole of diode (D1) connects the negative pole of diode (D2), electric capacity (C9) positive pole, electric capacity (C40); Diode (D2) positive pole connects switching tube (Q2) output; Master controller connecting resistance (R44); The other end connecting resistance (R9) of resistance (R44), triode (Q1, input Q3) (base stage); Electric capacity (C10) connects the output (collector electrode) of triode (Q1), electric capacity (C10) other end connecting resistance (R9) and ground wire; Output (emitter) connecting resistance (R7) of triode (Q3), the input of input (Q2).
Fig. 3 is the circuit diagram of the utility model embodiment illuminating LED driver LLC resonant control circuit.As shown in Figure 3, the LLC circuit relies on two switch Q10 and the Q11 in the half-bridge topology, drives a resonant tank and power transformer T.The LLC circuit has two resonance frequencys: series resonance frequency and parallel resonance frequency.Usually under rated voltage, the operating frequency of LLC converter design is slightly higher than series resonance frequency.At this working stage, switch mosfet can no-voltage move, thereby reduces switching loss.Under the general work pattern, the switching frequency of LLC controller will change in less frequency range to regulate output voltage.
MOSFET Q10 and Q11 form the LLC half-bridge.They directly drive through resistance R56 and R58.Capacitor C 39 is a primary resonant electric capacity, therefore should be low-loss type electric capacity, and its rated value is allowed the highest RMS electric current when maximum load occurring.Transformer T has the big capacity leakage inductance of an inherence, with the C39 acting in conjunction, forms series resonant tank.Capacitor C 40 is used for local bypass, and is adjacent with Q10 and Q11.The primary current that resistance R 59 detects controller is to provide overload protection.
Electric capacity (C40) two termination switching tubes (Q10, output Q11) wherein; The master controller connecting resistance (R56, L6, R58), an end of magnetic bead (L7); The input of another termination switching tube (Q10) of resistance (R56), the negative pole of diode (D20); The positive pole of diode (D20) meets (L6), the output of switching tube (Q10); Resistance (R58) connects the negative pole of diode and the input of switching tube (Q11); Diode (D19) positive pole connects (L7) and output (Q11); The output termination capacitor (C39) of switching tube (Q10); Another termination transformer (T) primary side 3 pins of electric capacity (C39); Transformer (T) primary side 2 pin connecting resistances (R59); Another termination capacitor (CX6) of resistance (R59), another termination feedback control loop of electric capacity (CX6).
As shown in Figure 3, the output that output rectification and filter circuit comprise transformer T primary side via D9, D10, C41 rectification and filtering after the output galvanic current press.
Wherein transformer T primary side 12 pins connect diode D9A positive pole, and diode D9A connects capacitor C 38, the positive pole of C41 and feedback control loop.Capacitor C 38, the negative pole of C41 connect transformer T primary side 12,14 pins.It is anodal that transformer T primary side 15 pins meet diode D9B, and diode D9B negative pole connects diode D9A negative pole.
Fig. 4 is the circuit diagram of the utility model embodiment illuminating LED driver feedback control loop.As shown in Figure 4, resistance R 54 is optical coupler loads.Diode VR12 allows optical coupler to draw the LLC feedback pin on only.The Voltage Feedback control unit, the output voltage of LLC transducer through resistance R 66, R67 detect, weighted sum sues for peace.Resistance R 30 is set resistance for master gain.Resistance R 107 forms phase advancer with C51, can expand the crossover frequency and increase phase margin of feedback control loop.Resistance R 70, C44, C24 and R67 set low-frequency compensation jointly.Capacitor C 68 is a kind of " soft junction bundle " electric capacity, and conducting when output voltage rises reduces the output overshoot when starting.It can not influence the characteristic of primary feedback loop.
The anodal connecting resistance of electric capacity (C41) (R66, R30, R107, R66); Another termination potentiometer (RVT) of resistance (R66); Another termination of potentiometer (RVT) (C24), resistance (R67), optocoupler (U3) positive pole; Another termination capacitor of electric capacity (C24) (C44), resistance (R70); Pressurizer (U3) negative pole connects electric capacity (C68), diode (VR12) positive pole; Diode (VR12) negative pole meets (R60), optocoupler (U2) input; Optocoupler (U2) output connecting resistance (R54), electric capacity (C77), master controller.
Fig. 5 is the circuit diagram of the utility model embodiment illuminating LED driver constant current control module.As shown in Figure 5, the constant current control module comprises highly integrated LED control chip and the peripheral circuit of LM34xx series that National Semiconductor releases, the whole BUCK topological structure that adopts of constant current control module.Switching tube Q4 wherein, Q5 is the P-channel field-effect transistor (PEFT) pipe, and D5 is a diode, and L2 is an inductance, has formed basic BUCK topological structure by above-mentioned device.Effect is that the input high voltage is adjusted into suitable output voltage.
Wherein resistance R 80 connecting resistance R82 and master controller U4; Another termination capacitor C 81 of resistance R 82, master controller U4; Resistance R 83 meets master controller U4; Resistance R 84, capacitor C 84 meets master controller U4; Resistance R 81, capacitor C 80 meets master controller U4; Capacitor C 82 meets master controller U4; Switching tube Q4, Q5 meet master controller U4; Diode D5 meets L2, capacitor C 85, capacitor C 83.
In the utility model, adopt PI company power management chip, PLC810PG is a master controller, and this chip internal has comprised PFC control unit and LLC control unit, forms an independently closed-loop control system.The frequency lock of PFC transducer is in LLC, to reduce noise and electromagnetic interference.Can carry out dynamic adjustments to PFC PWM output phase according to the LLC phase place, so that the switch edge is non-intersect with the responsive part of the noise in pulse width modulation (PWM) and the LLC sequence circuit.Avoid the edge conflicts technique can improve performance.The Phase synchronization management can reduce the ripple current of EMI spectrum component and PFC electric capacity.This IC can effectively manage the work of whole AC/DC module.
Highly integrated LED control chip and the peripheral circuit of LM34xx series that wherein constant current control module adopts National Semiconductor to release.Its module architectures is the BUCK topological structure, and wherein the LM34xx family chip is a P raceway groove voltage-dropping type constant-current controller.The LM34xx family chip has wide range input voltage, and the differential adjustable threshold electric current and voltage of high and low side detects, fast output enable/characteristics such as forbidding.And adopt (COFT) regulating and controlling mechanism of constant turn-off time, can regulate electric current accurately and need not the external control loop compensation.Have PWM light modulation and highly accurate linearity light adjusting function simultaneously, dimming scope is accurate; Have good contrast, have functions such as complete under-voltage locking able to programme, low-power consumption shutoff and heat shutoff.It is the very strong constant current control chip of a practicality.The control chip PLC810 that the utility model adopted has the function to output voltage, current detecting.When detecting output voltage, electric current because during the unusual sudden change that open circuit or short circuit cause, control chip PLC810 can cut off the electricity supply automatically to quit work and play the effect of short-circuit protection and open-circuit-protection duplicate protection.Control chip PLC810 has PWM light modulation and highly accurate linearity light adjusting function simultaneously to make high-power illumination is realized constant-current driving and drive current scalable with LED, has improved the output current precision.
Above-described specific embodiment; Purpose, technical scheme and beneficial effect to the utility model have carried out further explain, it should be understood that the above is merely the specific embodiment of the utility model; Be not limited to the utility model; All within the spirit and principle of the utility model, any modification of being made, be equal to replacement, improvement etc., all should be included within the protection range of the utility model.
Claims (11)
1. an illuminating LED driver is characterized in that, comprising:
Adopt LLC resonant transformation topological structure, electric main is become the AC/DC module of low-voltage DC; And
With the constant current control module that said AC/DC module is connected, it exports constant current with said low-voltage DC as driving voltage, to realize the constant-current driving LED light source.
2. illuminating LED driver according to claim 1 is characterized in that, said AC/DC module comprises:
Electric main is carried out the em filtering and the input rectification circuit of rectification;
The PFC circuit of power factor correction that is connected with said em filtering and input rectification circuit, the electric current of exporting behind its adjustment process em filtering and the input rectification circuit and the phase difference of voltage boost to predetermined voltage with the direct voltage after the rectification simultaneously;
The LLC resonant control circuit that is connected with said PFC circuit of power factor correction; Its with the output voltage of PFC circuit of power factor correction as input voltage; The control switch device is implemented in opening or turn-offing under no-voltage and the zero current condition; Direct voltage is converted into square-wave voltage exports the primary end to, export output rectification and filter circuit to via the transformer secondary output end again;
With output rectification and the filter circuit that said transformer secondary output end is connected, it will carry out rectification and filtering through the voltage of transformer secondary output end output, and the output galvanic current is pressed and is used to drive said constant current control module;
With the feedback control loop that output rectification and filter circuit are connected, it feeds back to master controller through the output voltage variable quantity of gathering output rectification and filter circuit; And
With the master controller that said feedback control loop is connected, its voltage variety according to feedback is adjusted the output frequency of LLC resonant control circuit; And be connected with the PFC circuit of power factor correction, the alternating voltage of input less than or the PFC switching frequency is regulated during greater than scheduled voltage, make input voltage be adjusted to predetermined value.
3. illuminating LED driver according to claim 2 is characterized in that, said em filtering and input rectification circuit comprise fuse (F1), piezo-resistance (RV1), thermistor (RT1); First electric capacity (C1), the 3rd electric capacity (C3), the 4th electric capacity (C4), the 7th electric capacity (C7); Inductance (L1), first resistance (R1), second resistance (R2), the 3rd resistance (R3); The 6th resistance (R6), the 8th resistance (R8), the 3rd diode (D3), the 4th diode (D4) and rectifier bridge (BD1);
Wherein, the positive pole of the input termination power of fuse (F1) input, output termination piezo-resistance (RV1), an end of thermistor (RT1); Thermistor (RT1) connects the positive pole of the 3rd electric capacity (C3), and thermistor (RV1) connects the negative pole of the 3rd electric capacity (C3); The input of two output termination inductance (L1) of the 3rd electric capacity (C3); The positive pole of inductance output connects first electric capacity (C1), another termination the 5th electric capacity (C5) of first electric capacity (C1), the negative pole of another termination inductance (L1) of the 5th electric capacity (C5); The anodal connecting resistance (R1) of first electric capacity (C1), another termination second resistance (R2) of resistance (R1), another termination the 3rd resistance (R3) of second resistance (R2), the negative pole of another termination inductance of the 3rd resistance (R3); First resistance (R1) connects the positive pole of the 4th electric capacity (C4), and the negative pole of the 4th electric capacity (C4) connects the negative pole of inductance, and the 4th electric capacity (C4) connects rectifier bridge (DB1) positive pole, and rectification bridge output end connects the 7th electric capacity (C7) and PFC control circuit; The positive pole of another termination the 8th resistance (R8) of the 7th electric capacity (C7) and the 6th resistance (R6) and the 4th diode (D4); The negative pole of the 4th diode (D4) connects the positive pole of the 3rd diode (D3), and the negative pole of the 3rd diode (D3) connects master controller.
4. illuminating LED driver according to claim 3 is characterized in that, said thermistor (RT1) is used for limit inrush currents, and said piezo-resistance (RV1) is used to limit surge voltage.
5. illuminating LED driver according to claim 2 is characterized in that, said PFC circuit of power factor correction comprises the 7th resistance (R7), the 9th resistance (R9); The 44 resistance (R44), the 9th electric capacity (C9), the tenth electric capacity (C10), the 40 electric capacity (C40); First diode (D1), second diode (D2), first triode (Q1); The 3rd triode (Q3), second switch pipe (Q2), the 4th inductance (L4);
Wherein, the positive pole of first diode (D1) connects the input of the 4th inductance (L4), the output termination power control circuit of the 4th inductance (L4); The negative pole of first diode (D1) connects the negative pole of second diode (D2), the 9th electric capacity (C9) positive pole, the 40 electric capacity (C40); Second diode (D2) positive pole connects second switch pipe (Q2) output; Master controller connects the 44 resistance (R44); Another termination the 9th resistance (R9) of the 44 resistance (R44), the input of first triode (Q1), the 3rd triode (Q3); The tenth electric capacity (C10) connects the output of first triode (Q1), the tenth electric capacity (C10) another termination the 9th resistance (R9) and ground wire; Output termination the 7th resistance (R7) of the 3rd triode (Q3), the input of input termination second triode (Q2) of the 3rd triode.
6. illuminating LED driver according to claim 2 is characterized in that, said LLC resonant control circuit comprises: the 56 resistance (R56), the 58 resistance (R58); The 59 resistance (R59), the 40 electric capacity (C40), the 39 electric capacity (C39), the 6th safety electric capacity (CX6); The 20 diode (D20), the 19 diode (D19), the tenth switching tube (Q10), the 11 switching tube (Q11); The 6th magnetic bead (L6), the 7th magnetic bead (L7), transformer (T);
Wherein, the 40 electric capacity (C40) two terminations the tenth switching tubes (Q10), the output of the 11 switching tube (Q11); Master controller connects the 56 resistance (R56), the 6th inductance (L6), the 58 resistance (R58), an end of the 7th magnetic bead (L7); The input of another termination the tenth switching tube (Q10) of the 56 resistance (R56), the negative pole of the 20 diode (D20); The positive pole of the 20 diode (D20) connects the 6th inductance (L6), the output of the tenth switching tube (Q10); The 58 resistance (R58) connects the negative pole of diode and the input of the 11 switching tube (Q11); The 19 diode (D19) positive pole connects the output of the 7th inductance (L7) and the 11 switching tube (Q11); Output termination the 9th electric capacity (C39) of the tenth switching tube (Q10); Another termination transformer (T) primary side 3 pins of the 39 electric capacity (C39); Transformer (T) primary side 2 pins connect the 59 resistance (R59); Another termination the 6th safety electric capacity (CX6) of the 59 resistance (R59), another termination feedback control loop of the 6th safety electric capacity (CX6).
7. illuminating LED driver according to claim 6 is characterized in that, the tenth switching tube (Q10) and the 11 switching tube (Q11) form the LLC half-bridge and directly drive through resistance (R56 and R58); The 39 electric capacity (C39) is primary resonant electric capacity, and its rated value is allowed the highest RMS electric current when maximum load occurring; Transformer (T) and the 39 electric capacity (C39) acting in conjunction form series resonant tank; The 40 electric capacity (C40) is used for local bypass; The 59 resistance (R59) detects the primary current of controller so that overload protection to be provided.
8. illuminating LED driver according to claim 2 is characterized in that, said feedback control loop comprises: the 30 resistance (R30), the 54 resistance (R54); The 66 resistance (R66), the 67 resistance (R67), the 70 resistance (R70), the 107 resistance (R107); The 24 electric capacity (C24), the 41 electric capacity (C41), the 44 electric capacity (C44); The 51 electric capacity (C51), the 68 electric capacity (C68), the 77 electric capacity (C77); Potentiometer (RVT), pressurizer (U3), second optocoupler (U2);
Wherein, the positive pole of the 41 electric capacity (C41) connects the 66 resistance (R66), the 30 resistance (R30), the 107 resistance (R107), the 66 (R66); Another termination potentiometer (RVT) of the 66 resistance (R66); Another termination the 24 electric capacity (C24) of potentiometer (RVT), the 67 resistance (R67), the 3rd optocoupler (U3) positive pole; Another termination the 44 electric capacity (C44) of the 24 electric capacity (C24), the 70 resistance (R70); Pressurizer (U3) negative pole connects the 68 electric capacity (C68), the 12 voltage stabilizing didoe (VR12) positive pole; Diode (VR12) negative pole connects the 60 resistance (R60), second optocoupler (U2) input; Second optocoupler (U2) output termination the 54 resistance (R54), the 77 electric capacity (C77), master controller.
9. according to each described illuminating LED driver in the claim 1 to 6, it is characterized in that said constant current control module comprises: the 80 resistance (R80), the 81 resistance (R81); The 82 resistance (R82), the 83 resistance (R83), the 84 resistance (R84), the 80 electric capacity (C80); The 81 electric capacity (C81), the 82 electric capacity (C82), the 83 electric capacity (C83), the 84 electric capacity (C84); The 85 electric capacity (C85), second inductance (L2), the 5th diode (D5); The 4th switching tube (Q4), the 5th switching tube (Q5), constant-current controller (U4);
Wherein, the 80 resistance (R80) connects the 82 resistance (R82), the 4th constant-current controller (U4); Another termination the 81 electric capacity (C81) of the 82 resistance (R82), the 4th constant-current controller (U4); The 83 resistance (R83) connects the 4th constant-current controller (U4); The 84 resistance (R84), the 84 electric capacity (C84) connects the 4th constant-current controller (U4); The 81 resistance (R81), the 80 electric capacity (C80) connects the 4th constant-current controller (U4); The 82 electric capacity (C82) connects the 4th constant-current controller (U4); The 4th switching tube (Q4), the 5th switching tube (Q5) connects constant-current controller (U4); The 5th diode (D5) connects second inductance (L2), the 85 electric capacity (C85), the 83 electric capacity (C83).
10. illuminating LED driver according to claim 9 is characterized in that, said the 4th switching tube (Q4), and the 5th switching tube (Q5) is the P-channel field-effect transistor (PEFT) pipe.
11. illuminating LED driver according to claim 9 is characterized in that, in the said constant current control module, exports with the control constant current through the time scale that turns on and off of controlling the 4th switching tube (Q4) and the 5th switching tube (Q5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204228381U CN202396031U (en) | 2011-10-31 | 2011-10-31 | Lighting LED driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204228381U CN202396031U (en) | 2011-10-31 | 2011-10-31 | Lighting LED driver |
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| Publication Number | Publication Date |
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| CN202396031U true CN202396031U (en) | 2012-08-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011204228381U Expired - Lifetime CN202396031U (en) | 2011-10-31 | 2011-10-31 | Lighting LED driver |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102333406A (en) * | 2011-10-31 | 2012-01-25 | 中国科学院自动化研究所 | Light-emitting diode (LED) driver for illumination |
| CN104348138A (en) * | 2013-07-23 | 2015-02-11 | 江阴高雷德电力自动化设备有限公司 | Power supply system |
| CN108894916A (en) * | 2018-06-11 | 2018-11-27 | 四川茂烨建筑智能化工程有限公司 | A kind of wind-driven generator rotation speed regulating and controlling system |
| CN108988663A (en) * | 2018-06-11 | 2018-12-11 | 珠海格力智能装备有限公司 | A kind of switching power circuit and Switching Power Supply |
-
2011
- 2011-10-31 CN CN2011204228381U patent/CN202396031U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102333406A (en) * | 2011-10-31 | 2012-01-25 | 中国科学院自动化研究所 | Light-emitting diode (LED) driver for illumination |
| CN104348138A (en) * | 2013-07-23 | 2015-02-11 | 江阴高雷德电力自动化设备有限公司 | Power supply system |
| CN108894916A (en) * | 2018-06-11 | 2018-11-27 | 四川茂烨建筑智能化工程有限公司 | A kind of wind-driven generator rotation speed regulating and controlling system |
| CN108988663A (en) * | 2018-06-11 | 2018-12-11 | 珠海格力智能装备有限公司 | A kind of switching power circuit and Switching Power Supply |
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