CN104619098A - Low-voltage ET/TRIAC dimmable LED adapter - Google Patents
Low-voltage ET/TRIAC dimmable LED adapter Download PDFInfo
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- CN104619098A CN104619098A CN201510098832.6A CN201510098832A CN104619098A CN 104619098 A CN104619098 A CN 104619098A CN 201510098832 A CN201510098832 A CN 201510098832A CN 104619098 A CN104619098 A CN 104619098A
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Abstract
The invention discloses a low-voltage ET(electronic transformer)/TRIAC dimmable LED adapter which comprises a resonant cavity, a first boosting conversion module, a second boosting conversion module, a phase angle detection module and an LED lamp string, wherein the first boosting conversion module is used for retaining input voltage to prevent the input voltage from being bucked so as to retain the input voltage of a later stage of transformer to be stabilized; the second boosting conversion module is used for providing constant current for an LED load; the phase angle detection module is used for detecting a cut phase angle of the input voltage and sending a detection result to the second boosting conversion module; the second boosting conversion module carries out modulation control on output current so as to provide constant current for the LED load. According to the low-voltage ET/TRIAC dimmable LED adapter, by adoption of an LC resonant cavity, an ET adapts to an adapter in return, and the reverse thinking is used; by adoption of a dual-boosting scheme, flashing caused by unstable input voltage is eliminated. In short, the dimmable LED is high in compatibility with the ET and is excellent in TRIAC dimming effect.
Description
Technical field
The present invention relates to a kind of LED drive device, particularly relate to a kind of low pressure ET/TRIAC Dimmable LED adapter.
Background technology
Existing LED Driving technique is primarily of following several: one is sluggish Buck (step-down) scheme, and shortcoming is incompatible light modulation, and ET (electronic transformer) compatible result is poor; Two is Boost (boosting)+Buck schemes, has an advantage to be that compatible ET effect is better, but incompatible light modulation; Three is single-stage boost approach, and compatible ET effect is better, but dimming effect is not good, easily glimmers.Application number is 201110187504.5, and denomination of invention is that the feature of the patent of invention of the constant current driving system applying to LED mainly contains: adding of the LC resonant cavity in the first frame; Alternating current-direct current all mates; But shortcoming is can not compatible TRIAC light modulation.In a word, having while good compatible ET on excellent this technical barrier of TRIAC dimming effect, there is no in the industry good solution.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, provides a kind of low pressure ET/TRIAC Dimmable LED adapter while good compatible ET with excellent TRIAC dimming effect.
For solving the problems of the technologies described above, the technical scheme that the present invention takes is: low pressure ET/TRIAC Dimmable LED adapter, is characterized in that: comprise resonant cavity, the first supercharging modular converter, the second supercharging modular converter, phase-angle detection module and LED string; Described resonant cavity, the first supercharging modular converter, the second supercharging modular converter and LED string are connected successively, and the other end of resonant cavity is input, and the other end of LED string is by resistance R1 ground connection; Also comprise electric capacity C1 and C2; Electric capacity C1 one end is connected with the output of the first supercharging modular converter, other end ground connection; Electric capacity C2 one end is connected with the defeated place end of the second supercharging modular converter, other end ground connection; The input of phase-angle detection module is connected with the input of the first supercharging modular converter, and output is connected with the second supercharging modular converter; Described first supercharging modular converter is used for input voltage and all keeps, and to prevent input voltage from falling, thus maintains the stable of the input voltage of rear class converter; Described second supercharging modular converter is used for providing constant electric current to LED load; Phase-angle detection module is used for detecting the cut angle of input voltage and testing result being delivered to the second supercharging modular converter, and the second supercharging modular converter carries out modulation control to output current, to provide constant electric current to LED load.
As further improved technical scheme of the present invention, described resonant cavity is made up of inductance L 1 and electric capacity C3; One end of inductance is input b, and the other end is connected with electric capacity C3, and the other end of electric capacity C 3 is input a;
As further improved technical scheme of the present invention, described first supercharging modular converter comprises electric capacity C4, electric capacity C5, two electric capacity C6, pole pipe D1, diode D2, diode D3, diode D4 and resistance R2; Electric capacity C6 and resistance R2 connects rear and electric capacity C1 is in parallel; The anode of diode D1 is connected with the output of inductance L 1, and diode D1 negative electrode is connected with diode D3 negative electrode, and diode D3 anode is connected with input a; Diode D2 negative electrode is connected with diode D1 anode, and diode D2 anode is connected with diode D4 anode, and diode D 4 negative electrode is connected with input a; Electric capacity C4 is connected in parallel on diode D3 two ends, and electric capacity C5 is connected in parallel on diode D4 two ends; Described second supercharging modular converter comprises current constant control chip, K switch 102, diode D5 and inductance L 2; Inductance L 2 one end is connected with diode D1 negative electrode, and the other end is connected with diode D5 anode, and diode D5 negative electrode is connected with the positive pole of LED string; K switch 102 one end is connected with diode D5 anode, other end ground connection; The phase angle signal that described current constant control chip exports according to the current signal of the LED string detected and phase-angle detection module, frequency or the duty ratio of the high-frequency impulse output signal exported by modulation current constant control chip change LED string output current; Described phase-angle detection module comprises clicks and enters R3, electric capacity C7 and level conversion unit; Resistance R3 one end is connected with diode D1 anode, ground connection after other end series capacitance C7; Level conversion unit is for detecting the effective value of input voltage and detection signal being sent into current constant control chip.
As further improved technical scheme of the present invention, also comprise rectifier bridge, electric capacity C8, electric capacity C9 and resistance R4; The input of rectifier bridge is connected with the output of resonant cavity, and electric capacity C8 one end is connected with the output of rectifier bridge, other end ground connection; Electric capacity C9 one end is connected with the output of rectifier bridge, ground connection after other end series resistance R4; Described first supercharging modular converter comprises inductance L 3, diode D6, K switch 101 and PWM generator; Inductance L 3 one end is connected with the output of rectifier bridge, and the other end is connected with diode D6 anode; K switch 101 one end is connected with diode D6 anode, other end ground connection; Described PWM generator for exporting high-frequency pulse signal, with the duty ratio of control switch K101; Described second supercharging modular converter comprises current constant control chip, K switch 102, diode D5 and inductance L 2; Inductance L 2 one end is connected with diode D6 negative electrode, and the other end is connected with diode D5 anode, and diode D5 negative electrode is connected with the positive pole of LED string; K switch 102 one end is connected with diode D5 anode, other end ground connection; The phase angle signal that described current constant control chip exports according to the current signal of the LED string detected and phase-angle detection module, frequency or the duty ratio of the high-frequency impulse output signal exported by modulation current constant control chip change LED string output current; Described phase-angle detection module comprises clicks and enters R3, electric capacity C7 and level conversion unit; Resistance R3 one end is connected with rectifier bridge input, ground connection after other end series capacitance C7.
As further improved technical scheme of the present invention, described first supercharging modular converter also comprises peak current regulon and resistance 5; Resistance R5 one end is connected with K switch 101, other end ground connection; Described peak current regulon is used for the peak current of sense switch pipe K101 and gives PWM generator by the peak-current signal detected, described PWM generator exports high-frequency pulse signal, with the duty ratio of control switch K101 according to the peak-current signal received.
As further improved technical scheme of the present invention, also comprise rectifier bridge, electric capacity C8, electric capacity C9 and resistance R4; The input of rectifier bridge is connected with the output of resonant cavity, and electric capacity C8 one end is connected with the output of rectifier bridge, other end ground connection; Electric capacity C9 one end is connected with the output of rectifier bridge, ground connection after other end series resistance R4; Described first supercharging modular converter comprises inductance L 3, diode D6, K switch 101, peak current regulon, resistance R5, resistance R6, resistance R7 and Isobarically Control chip; Resistance R6 one end is connected with diode D6 anode, ground connection after other end series resistance R7; Inductance L 3 one end is connected with the output of rectifier bridge, and the other end is connected with diode D6 anode; K switch 101 one end is connected with diode D6 anode, other end ground connection; Described second supercharging modular converter comprises current constant control chip, K switch 102, diode D5 and inductance L 2; Inductance L 2 one end is connected with diode D6 negative electrode, and the other end is connected with diode D5 anode, and diode D5 negative electrode is connected with the positive pole of LED string; K switch 102 one end is connected with diode D5 anode, other end ground connection; The phase angle signal that described current constant control chip exports according to the current signal of the LED string detected and phase-angle detection module, frequency or the duty ratio of the high-frequency impulse output signal exported by modulation current constant control chip change LED string output current; Described phase-angle detection module comprises clicks and enters R3, electric capacity C7 and level conversion unit; Resistance R3 one end is connected with rectifier bridge input, ground connection after other end series capacitance C7; Described peak current regulon be used for sense switch K101 peak current and, and give Isobarically Control chip by the peak-current signal detected, described Isobarically Control chip exports high-frequency pulse signal, with the duty ratio of control switch K101 according to the voltage of the peak current of K switch 101 and resistance R6.
As further improved technical scheme of the present invention, described LED string is made up of at least two LED component; Described LED component is single LED lamp pearl, LED string or LED strip and combines.
The effect of resonant cavity is the resonance frequency of the electronic transformer ET changing previous stage thus enables prime electronic transformer better this circuit adaptive, and rectifier bridge is that rectification is carried out in input.Second supercharging modular converter adopts supercharging current constant control mode, this module is that secondary voltage increase and current constant controls, to provide constant electric current to LED load, its input is from first class boost transducer, and self be again first class boost, thus avoid the output pulsation produced because of input fluctuation greatly.Phase-angle detection module is all to detect the cut angle of input voltage and the current constant control chip delivered in the second supercharging modular converter carries out modulation control to output current.Duty ratio or FREQUENCY CONTROL are a kind of control methods, it goes the effective value detecting input voltage to judge the cut angle of input voltage by D module, then the detection signal of D module is sent into the current constant control chip of C module, thus modulate the high-frequency impulse output signal of the chip in C module, or change frequency, or change its duty ratio, the size exporting LED current just can be changed by this change, such as: during normal completely input, input voltage effective value is 220V, when inputting modulated, the effective value of input voltage reduces gradually, (rms is exactly the abbreviation of effective value to be such as reduced to 110Vrms, international), so just there is the relation of a phase place between 110Vrms and 220Vrms, this relation also just means that the effective value of input reduces, so, tell that C module also will go to reduce accordingly to export, thus the way being reached through modulation input goes modulation to export, output is made to follow input change and change, briefly, input reduces exactly, export and also will reduce.
PWM generator produces a high-frequency pulse signal exactly, duty ratio D in order to control K101 (is also duty, Chinese is duty ratio), for one-level supercharging module, input Vin, export Vo1, so Vo1=Vin/ (1-D), that is controls this duty ratio D, just can control the Vo1 that one-level exports, and why the first order adopts supercharging, be because higher Vo1 is more conducive to the maintenance effect for exporting.Isobarically Control chip, as the term suggests be exactly in order to Isobarically Control, because the one-level supercharging module of Fig. 1 and Fig. 3 is the opened loop control adopted, so also just do not need control chip, and be adopt closed-loop control in block diagram 4, just need a control chip, its effect is the duty ratio of control K101 equally, but it can obtain more accurate Vo1 than block diagram 1 and block diagram 3
Current constant control chip, as Isobarically Control chip, is the duty ratio of the K102 controlling two-stage supercharging transducer, thus accurately controls the size of output current, also namely control the size of LED current.The peak current of peak current regulon namely instant sense switch pipe K101, and restriction control or modulation control are carried out to this peak current.First supercharging modular converter is an auxiliary unit, in order to adaptive ET and TRIAC while of widely, introduce the tuning difficulty of parameter that this unit can reduce prime A unit on the one hand, can be on the other hand rear class and a more stable source of supply is provided, avoid rear class C unit influenced because of the mismatch problems of A unit.C unit is the unit of powering to LED constant current, and his energy is from comparatively stable unit B (unit B has certain retention time ability).It is the unit that input cut angle is detected, by detecting effective value or the mean value of input voltage, by giving the current constant control chip of C unit after level conversion, by controlling work pulsewidth or the power-frequency of this chip, thus realize output current and follow input voltage change and corresponding change, realize effect of light modulation.
The present invention adopts LC resonant cavity, adopts two boost approach, adds phase-angle detection unit and firing circuit; Have employed LC resonant cavity makes ET adapt to adapter conversely, make use of reverse thinking; Have employed two boost approach, eliminate the flicker that input voltage shakiness causes; Input voltage average detection controls light modulation cut angle; Ignition capacitor is increased after input rectifying bridge.In a word, the present invention has excellent TRIAC dimming effect while good compatible ET.
Figure of description
Fig. 1 is schematic block circuit diagram of the present invention.
Fig. 2 be the embodiment of the present invention 1 realize theory diagram.
Fig. 3 be the embodiment of the present invention 2 realize theory diagram.
Fig. 4 be the embodiment of the present invention 3 realize theory diagram.
Fig. 5 be the embodiment of the present invention 4 realize theory diagram.
Below in conjunction with accompanying drawing, embodiment is described further.
Embodiment
Embodiment 1
See Fig. 1, this low pressure ET/TRIAC Dimmable LED adapter comprises resonant cavity, the first supercharging modular converter, the second supercharging modular converter, phase-angle detection module and LED string; Described resonant cavity, the first supercharging modular converter, the second supercharging modular converter and LED string are connected successively, and the other end of resonant cavity is input, and the other end of LED string is by resistance R1 ground connection; Also comprise electric capacity C1 and C2; Electric capacity C1 one end is connected with the output of the first supercharging modular converter, other end ground connection; Electric capacity C2 one end is connected with the defeated place end of the second supercharging modular converter, other end ground connection; The input of phase-angle detection module is connected with the input of the first supercharging modular converter, and output is connected with the second supercharging modular converter; Described first supercharging modular converter is used for input voltage and all keeps, and to prevent input voltage from falling, thus maintains the stable of the input voltage of rear class converter; Described second supercharging modular converter is used for providing constant electric current to LED load; Phase-angle detection module is used for detecting the cut angle of input voltage and testing result being delivered to the second supercharging modular converter, and the second supercharging modular converter carries out modulation control to output current, to provide constant electric current to LED load.
Preferably, be made up of inductance L 1 and electric capacity C3 see the above-mentioned resonant cavity of Fig. 2; One end of inductance L 1 is input b, and the other end is connected with electric capacity C3, and the other end of electric capacity C 3 is input a; Described first supercharging modular converter comprises electric capacity C6, electric capacity C4, electric capacity C5, diode D1, diode D2, diode D3, diode D4 and resistance R2; Electric capacity C6 and resistance R2 connects rear and electric capacity C1 is in parallel; The anode of diode D1 is connected with the output of inductance L 1, and diode D1 negative electrode is connected with diode D3 negative electrode, and diode D3 anode is connected with input a; Diode D2 negative electrode is connected with diode D1 anode, and diode D2 anode is connected with diode D4 anode, and diode D 4 negative electrode is connected with input a; Electric capacity C4 is connected in parallel on diode D3 two ends, and electric capacity C5 is connected in parallel on diode D4 two ends; Described second supercharging modular converter comprises current constant control chip, K switch 102, diode D5 and inductance L 2; Inductance L 2 one end is connected with diode D1 negative electrode, and the other end is connected with diode D5 anode, and diode D5 negative electrode is connected with the positive pole of LED string; K switch 102 one end is connected with diode D5 anode, other end ground connection; The phase angle signal that described current constant control chip exports according to the current signal of the LED string detected and phase-angle detection module, frequency or the duty ratio of the high-frequency impulse output signal exported by modulation current constant control chip change LED string output current; Described phase-angle detection module comprises clicks and enters R3, electric capacity C7 and level conversion unit; Resistance R3 one end is connected with diode D1 anode, ground connection after other end series capacitance C7; Level conversion unit is for detecting the effective value of input voltage and detection signal being sent into current constant control chip.Described LED string is made up of at least two LED component; Described LED component is single LED lamp pearl, LED string or LED strip and combines.
In the present embodiment, the first supercharging modular converter is for being a multiplication of voltage conversion, and this level is that first class boost controls, and is the maintenance done to prevent input voltage from falling, thus maintains the stable of the input of rear class converter.
Embodiment 2
See Fig. 1 and Fig. 3, this low pressure ET/TRIAC Dimmable LED adapter comprises resonant cavity, the first supercharging modular converter, the second supercharging modular converter, phase-angle detection module and LED string; Described resonant cavity, the first supercharging modular converter, the second supercharging modular converter and LED string are connected successively, and the other end of resonant cavity is input, and the other end of LED string is by resistance R1 ground connection; Also comprise electric capacity C1 and C2; Electric capacity C1 one end is connected with the output of the first supercharging modular converter, other end ground connection; Electric capacity C2 one end is connected with the defeated place end of the second supercharging modular converter, other end ground connection; The input of phase-angle detection module is connected with the input of the first supercharging modular converter, and output is connected with the second supercharging modular converter; Described first supercharging modular converter is used for input voltage and all keeps, and to prevent input voltage from falling, thus maintains the stable of the input voltage of rear class converter; Described second supercharging modular converter is used for providing constant electric current to LED load; Phase-angle detection module is used for detecting the cut angle of input voltage and testing result being delivered to the second supercharging modular converter, and the second supercharging modular converter carries out modulation control to output current, to provide constant electric current to LED load.
Preferably, rectifier bridge, electric capacity C8, electric capacity C9 and resistance R4 is also comprised; The input of rectifier bridge is connected with the output of resonant cavity, and electric capacity C8 one end is connected with the output of rectifier bridge, other end ground connection; Electric capacity C9 one end is connected with the output of rectifier bridge, ground connection after other end series resistance R4; Described first supercharging modular converter comprises inductance L 3, diode D6, K switch 101 and PWM generator; Inductance L 3 one end is connected with the output of rectifier bridge, and the other end is connected with diode D6 anode; K switch 101 one end is connected with diode D6 anode, other end ground connection; Described PWM generator for exporting high-frequency pulse signal, with the duty ratio of control switch K101; Described second supercharging modular converter comprises current constant control chip, K switch 102, diode D5 and inductance L 2; Inductance L 2 one end is connected with diode D6 negative electrode, and the other end is connected with diode D5 anode, and diode D5 negative electrode is connected with the positive pole of LED string; K switch 102 one end is connected with diode D5 anode, other end ground connection; The phase angle signal that described current constant control chip exports according to the current signal of the LED string detected and phase-angle detection module, frequency or the duty ratio of the high-frequency impulse output signal exported by modulation current constant control chip change LED string output current; Described phase-angle detection module comprises clicks and enters R3, electric capacity C7 and level conversion unit; Resistance R3 one end is connected with rectifier bridge input, ground connection after other end series capacitance C7.Described LED string is made up of at least two LED component; Described LED component is single LED lamp pearl, LED string or LED strip and combines.
In the present embodiment, comprise one and humorously can there is firing circuit, otherwise can circuit structure be destroyed, the effect of resonant cavity is the internal resonant structure that formation resonant element changes prime electronic transformer on the one hand, thus make it possible to better adaptive electronic transformer, on the other hand, the noise when introducing of inductance effectively can suppress peak current and reduce light modulation, capacitor's capacity after bridge is larger than the capacitor's capacity of resonant cavity, its effect mainly starts at TRIAC the effect playing igniting instantaneously at every turn, in addition, inductance, electric capacity can play filter action to EMI.
In the present embodiment, the first supercharging modular converter is complete open loop control mode.
Embodiment 3
See Fig. 1 and Fig. 4, the described first supercharging modular converter of this low pressure ET/TRIAC Dimmable LED adapter also comprises peak current regulon and resistance 5; Resistance R5 one end is connected with K switch 101, other end ground connection; Described peak current regulon is used for the peak current of sense switch pipe K101 and gives PWM generator by the peak-current signal detected, described PWM generator exports high-frequency pulse signal, with the duty ratio of control switch K101 according to the peak-current signal received.In the present embodiment, the first supercharging modular converter is open loop+current limit control mode.
In the present embodiment, comprise one and humorously can there is firing circuit, otherwise can circuit structure be destroyed, the effect of resonant cavity is the internal resonant structure that formation resonant element changes prime electronic transformer on the one hand, thus make it possible to better adaptive electronic transformer, on the other hand, the noise when introducing of inductance effectively can suppress peak current and reduce light modulation, capacitor's capacity after bridge is larger than the capacitor's capacity of resonant cavity, its effect mainly starts at TRIAC the effect playing igniting instantaneously at every turn, in addition, inductance, electric capacity can play filter action to EMI.
Other parts of the present embodiment are identical with embodiment 2 no longer to be described in detail.
Embodiment 4
See Fig. 1 and Fig. 5, this low pressure ET/TRIAC Dimmable LED adapter comprises resonant cavity, the first supercharging modular converter, the second supercharging modular converter, phase-angle detection module and LED string; Described resonant cavity, the first supercharging modular converter, the second supercharging modular converter and LED string are connected successively, and the other end of resonant cavity is input, and the other end of LED string is by resistance R1 ground connection; Also comprise electric capacity C1 and C2; Electric capacity C1 one end is connected with the output of the first supercharging modular converter, other end ground connection; Electric capacity C2 one end is connected with the defeated place end of the second supercharging modular converter, other end ground connection; The input of phase-angle detection module is connected with the input of the first supercharging modular converter, and output is connected with the second supercharging modular converter; Described first supercharging modular converter is used for input voltage and all keeps, and to prevent input voltage from falling, thus maintains the stable of the input voltage of rear class converter; Described second supercharging modular converter is used for providing constant electric current to LED load; Phase-angle detection module is used for detecting the cut angle of input voltage and testing result being delivered to the second supercharging modular converter, and the second supercharging modular converter carries out modulation control to output current, to provide constant electric current to LED load.
Preferably, see Fig. 5, comprise rectifier bridge, electric capacity C8, electric capacity C9 and resistance R4; The input of rectifier bridge is connected with the output of resonant cavity, and electric capacity C8 one end is connected with the output of rectifier bridge, other end ground connection; Electric capacity C9 one end is connected with the output of rectifier bridge, ground connection after other end series resistance R4; Described first supercharging modular converter comprises inductance L 3, diode D6, K switch 101, peak current regulon, resistance R5, resistance R6, resistance R7 and Isobarically Control chip; Resistance R6 one end is connected with diode D6 anode, ground connection after other end series resistance R7; Inductance L 3 one end is connected with the output of rectifier bridge, and the other end is connected with diode D6 anode; K switch 101 one end is connected with diode D6 anode, other end ground connection; Described second supercharging modular converter comprises current constant control chip, K switch 102, diode D5 and inductance L 2; Inductance L 2 one end is connected with diode D6 negative electrode, and the other end is connected with diode D5 anode, and diode D5 negative electrode is connected with the positive pole of LED string; K switch 102 one end is connected with diode D5 anode, other end ground connection; The phase angle signal that described current constant control chip exports according to the current signal of the LED string detected and phase-angle detection module, frequency or the duty ratio of the high-frequency impulse output signal exported by modulation current constant control chip change LED string output current; Described phase-angle detection module comprises clicks and enters R3, electric capacity C7 and level conversion unit; Resistance R3 one end is connected with rectifier bridge input, ground connection after other end series capacitance C7; Described peak current regulon be used for sense switch K101 peak current and, and give Isobarically Control chip by the peak-current signal detected, described Isobarically Control chip exports high-frequency pulse signal, with the duty ratio of control switch K101 according to the voltage of the peak current of K switch 101 and resistance R6.
In the present embodiment, comprise one and humorously can there is firing circuit, otherwise can circuit structure be destroyed, the effect of resonant cavity is the internal resonant structure that formation resonant element changes prime electronic transformer on the one hand, thus make it possible to better adaptive electronic transformer, on the other hand, the noise when introducing of inductance effectively can suppress peak current and reduce light modulation, capacitor's capacity after bridge is larger than the capacitor's capacity of resonant cavity, its effect mainly starts at TRIAC the effect playing igniting instantaneously at every turn, in addition, inductance, electric capacity can play filter action to EMI.
In the present embodiment, the first supercharging modular converter is closed loop+current limit control mode.
Claims (7)
1. a low pressure ET/TRIAC Dimmable LED adapter, is characterized in that: comprise resonant cavity, the first supercharging modular converter, the second supercharging modular converter, phase-angle detection module and LED string; Described resonant cavity, the first supercharging modular converter, the second supercharging modular converter and LED string are connected successively, and the other end of resonant cavity is input, and the other end of LED string is by resistance R1 ground connection; Also comprise electric capacity C1 and C2; Electric capacity C1 one end is connected with the output of the first supercharging modular converter, other end ground connection; Electric capacity C2 one end is connected with the defeated place end of the second supercharging modular converter, other end ground connection; The input of phase-angle detection module is connected with the input of the first supercharging modular converter, and output is connected with the second supercharging modular converter;
Described first supercharging modular converter is used for input voltage and all keeps, and to prevent input voltage from falling, thus maintains the stable of the input voltage of rear class converter; Described second supercharging modular converter is used for providing constant electric current to LED load; Described phase-angle detection module is used for detecting the cut angle of input voltage and testing result being delivered to the second supercharging modular converter, and the second supercharging modular converter carries out modulation control to output current, to provide constant electric current to LED load.
2. low pressure ET/TRIAC Dimmable LED adapter according to claim 1, is characterized in that: described resonant cavity is made up of inductance L 1 and electric capacity C3; One end of inductance is input b, and the other end is connected with electric capacity C3, and the other end of electric capacity C 3 is input a.
3. low pressure ET/TRIAC Dimmable LED adapter according to claim 1, is characterized in that: described first supercharging modular converter comprises electric capacity C4, electric capacity C5, electric capacity C6, diode D1, diode D2, diode D3, diode D4 and resistance R2; Electric capacity C6 and resistance R2 connects rear and electric capacity C1 is in parallel; The anode of diode D1 is connected with the output of inductance L 1, and diode D1 negative electrode is connected with diode D3 negative electrode, and diode D3 anode is connected with input a; Diode D2 negative electrode is connected with diode D1 anode, and diode D2 anode is connected with diode D4 anode, and diode D 4 negative electrode is connected with input a; Electric capacity C4 is connected in parallel on diode D3 two ends, and electric capacity C5 is connected in parallel on diode D4 two ends; Described second supercharging modular converter comprises current constant control chip, K switch 102, diode D5 and inductance L 2; Inductance L 2 one end is connected with diode D1 negative electrode, and the other end is connected with diode D5 anode, and diode D5 negative electrode is connected with the positive pole of LED string; K switch 102 one end is connected with diode D5 anode, other end ground connection; The phase angle signal that described current constant control chip exports according to the current signal of the LED string detected and phase-angle detection module, frequency or the duty ratio of the high-frequency impulse output signal exported by modulation current constant control chip change LED string output current; Described phase-angle detection module comprises clicks and enters R3, electric capacity C7 and level conversion unit; Resistance R3 one end is connected with diode D1 anode, ground connection after other end series capacitance C7; Described level conversion unit is for detecting the effective value of input voltage and detection signal being sent into current constant control chip.
4. low pressure ET/TRIAC Dimmable LED adapter according to claim 1, is characterized in that: also comprise rectifier bridge, electric capacity C8, electric capacity C9 and resistance R4; The input of rectifier bridge is connected with the output of resonant cavity, and electric capacity C8 one end is connected with the output of rectifier bridge, other end ground connection; Electric capacity C9 one end is connected with the output of rectifier bridge, ground connection after other end series resistance R4; Described first supercharging modular converter comprises inductance L 3, diode D6, K switch 101 and PWM generator; Inductance L 3 one end is connected with the output of rectifier bridge, and the other end is connected with diode D6 anode; K switch 101 one end is connected with diode D6 anode, other end ground connection; Described PWM generator for exporting high-frequency pulse signal, with the duty ratio of control switch K101; Described second supercharging modular converter comprises current constant control chip, K switch 102, diode D5 and inductance L 2; Inductance L 2 one end is connected with diode D6 negative electrode, and the other end is connected with diode D5 anode, and diode D5 negative electrode is connected with the positive pole of LED string; K switch 102 one end is connected with diode D5 anode, other end ground connection; The phase angle signal that described current constant control chip exports according to the current signal of the LED string detected and phase-angle detection module, frequency or the duty ratio of the high-frequency impulse output signal exported by modulation current constant control chip change LED string output current; Described phase-angle detection module comprises clicks and enters R3, electric capacity C7 and level conversion unit; Resistance R3 one end is connected with rectifier bridge input, ground connection after other end series capacitance C7.
5. low pressure ET/TRIAC Dimmable LED adapter according to claim 4, is characterized in that: described first supercharging modular converter comprises peak current regulon and resistance 5; Resistance R5 one end is connected with K switch 101, other end ground connection; Described peak current regulon is used for the peak current of sense switch pipe K101 and gives PWM generator by the peak-current signal detected, described PWM generator exports high-frequency pulse signal, with the duty ratio of control switch K101 according to the peak-current signal received.
6. low pressure ET/TRIAC Dimmable LED adapter according to claim 1, is characterized in that: also comprise rectifier bridge, electric capacity C8, electric capacity C9 and resistance R4; The input of rectifier bridge is connected with the output of resonant cavity, and electric capacity C8 one end is connected with the output of rectifier bridge, other end ground connection; Electric capacity C9 one end is connected with the output of rectifier bridge, ground connection after other end series resistance R4; Described first supercharging modular converter comprises inductance L 3, diode D6, K switch 101, peak current regulon, resistance R5, resistance R6, resistance R7 and Isobarically Control chip; Resistance R6 one end is connected with diode D6 anode, ground connection after other end series resistance R7; Inductance L 3 one end is connected with the output of rectifier bridge, and the other end is connected with diode D6 anode; K switch 101 one end is connected with diode D6 anode, other end ground connection; Described second supercharging modular converter comprises current constant control chip, K switch 102, diode D5 and inductance L 2; Inductance L 2 one end is connected with diode D6 negative electrode, and the other end is connected with diode D5 anode, and diode D5 negative electrode is connected with the positive pole of LED string; K switch 102 one end is connected with diode D5 anode, other end ground connection; The phase angle signal that described current constant control chip exports according to the current signal of the LED string detected and phase-angle detection module, frequency or the duty ratio of the high-frequency impulse output signal exported by modulation current constant control chip change LED string output current; Described phase-angle detection module comprises clicks and enters R3, electric capacity C7 and level conversion unit; Resistance R3 one end is connected with rectifier bridge input, ground connection after other end series capacitance C7; Described peak current regulon be used for sense switch K101 peak current and, and give Isobarically Control chip by the peak-current signal detected, described Isobarically Control chip exports high-frequency pulse signal, with the duty ratio of control switch K101 according to the voltage of the peak current of K switch 101 and resistance R6.
7. the low pressure ET/TRIAC Dimmable LED adapter according to claim 1 or 2 or 3 or 4 or 5 or 6, is characterized in that: described LED string is made up of at least two LED component; Described LED component is single LED lamp pearl, LED string or LED strip and combines.
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| CN201510098832.6A CN104619098A (en) | 2014-11-21 | 2015-03-05 | Low-voltage ET/TRIAC dimmable LED adapter |
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| CN2014106744477 | 2014-11-21 | ||
| CN201410674447 | 2014-11-21 | ||
| CN201510098832.6A CN104619098A (en) | 2014-11-21 | 2015-03-05 | Low-voltage ET/TRIAC dimmable LED adapter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107666742A (en) * | 2017-10-23 | 2018-02-06 | 江西美的贵雅照明有限公司 | LED drive circuit and light fixture |
| CN114364094A (en) * | 2021-11-22 | 2022-04-15 | 无锡三和绿能环境有限公司 | Intelligent night safety warning illuminator |
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| US20130162156A1 (en) * | 2011-12-23 | 2013-06-27 | Marvell World Trade Ltd. | Method and apparatus for current control with led driver |
| CN103200747A (en) * | 2013-04-22 | 2013-07-10 | 深圳市裕富照明有限公司 | Dimmable LED (light-emitting diode) power supply |
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| CN102368881A (en) * | 2011-07-06 | 2012-03-07 | 晋宝电气（浙江）有限公司 | Constant current driving system used for LED lamp |
| US20130162156A1 (en) * | 2011-12-23 | 2013-06-27 | Marvell World Trade Ltd. | Method and apparatus for current control with led driver |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107666742A (en) * | 2017-10-23 | 2018-02-06 | 江西美的贵雅照明有限公司 | LED drive circuit and light fixture |
| CN114364094A (en) * | 2021-11-22 | 2022-04-15 | 无锡三和绿能环境有限公司 | Intelligent night safety warning illuminator |
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