CN102665327B - Light-emitting diode power supply for illumination without transformer - Google Patents
Light-emitting diode power supply for illumination without transformer Download PDFInfo
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- CN102665327B CN102665327B CN201210109725.5A CN201210109725A CN102665327B CN 102665327 B CN102665327 B CN 102665327B CN 201210109725 A CN201210109725 A CN 201210109725A CN 102665327 B CN102665327 B CN 102665327B
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- 238000005286 illumination Methods 0.000 title claims abstract description 11
- 239000003990 capacitor Substances 0.000 claims abstract description 51
- 238000005070 sampling Methods 0.000 claims abstract description 47
- 238000004146 energy storage Methods 0.000 claims abstract description 27
- 238000001914 filtration Methods 0.000 claims abstract description 25
- 230000000087 stabilizing effect Effects 0.000 claims description 14
- 230000005611 electricity Effects 0.000 claims description 10
- 230000002459 sustained effect Effects 0.000 claims description 9
- 230000000694 effects Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 2
- 239000002131 composite material Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 230000001276 controlling effect Effects 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
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Abstract
The invention provides a light-emitting diode power supply for illumination without a transformer. The power supply comprises a main circuit, a voltage-stabilizing constant current control circuit and an LED power interface, wherein the main circuit divides voltage through a plurality of rectifier diodes and voltage-dividing capacitors arranged at intervals and connected in series and generates DC output in a filtering energy storage capacitor when AC is input at the positive half period, and discharges supplementarily to the filtering energy storage capacitor through corresponding isolating diodes, a shared first electronic switch and a shared inductor respectively by each voltage-dividing capacitor when AC is input at the negative half period so as to generate DC output; and the voltage-stabilizing constant current control circuit processes sampling voltage signals and sampling current signals and then feeds the processed signals back to the main circuit so as to keep stable the working voltage and current of LEDs. The light-emitting diode power supply for illumination without a transformer is not provided with a transformer which is arranged on a common LED illumination power supply, so as to reduce the size, the weight and the cost of the power supply.
Description
Technical field
The present invention relates to a kind of illuminating power supply, particularly relate to a kind of transformerless for the D.C. regulated power supply to light-emitting diode power supply.
Background technology
At present, the common illuminating light-emitting diode (being called for short LED) of giving provides the D.C. regulated power supply of power supply all to contain one for the transformer of step-down, thereby volume can not accomplish very littlely, seem heavy, and transformer occupies very large production cost in D.C. regulated power supply.
Summary of the invention
The object of the invention is: overcome that the volume that the existing common D.C. regulated power supply containing transformer exists is large, heavy, high in cost of production is not enough, and a kind of transformerless D.C. regulated power supply to illuminating light-emitting diode power supply is provided.
Technical scheme of the present invention is: a kind of transless LED for illumination power supply, and its design feature is: comprise main circuit, pressure-stabilizing constant flow control circuit and LED power interface J1; LED power interface J1 has positive pole and negative pole; Above-mentioned main circuit is provided with alternating current input, DC power output end, the first control signal input, the second control signal input and pressure-stabilizing constant flow control circuit power output end; Above-mentioned pressure-stabilizing constant flow control circuit is provided with sampling voltage input, the first control signal output, the second control signal output, power end, sampling current input and sampling current output; The sampling voltage input of above-mentioned pressure-stabilizing constant flow control circuit is electrically connected to the DC power output end of main circuit; The first control signal input of main circuit is electrically connected to the first control signal output of pressure-stabilizing constant flow control circuit; The second control signal input of main circuit is electrically connected to the second control signal output of pressure-stabilizing constant flow control circuit; The pressure-stabilizing constant flow control circuit power output end of main circuit is electrically connected to the power end of pressure-stabilizing constant flow control circuit; The sampling current input of pressure-stabilizing constant flow control circuit is connected with the negative electricity of LED power interface J1; The sampling current output head grounding of pressure-stabilizing constant flow control circuit 2; The positive pole of LED power interface be electrically connected to the DC power output end of main circuit; Above-mentioned main circuit be a kind of when the positive half cycle of input AC electricity by some spaced rectifier diodes and dividing potential drop capacitances in series dividing potential drop and the circuit that produces direct current output at filtering energy storage capacitor Co, by corresponding isolating diode, shared the first electronic switch Q1 and inductance coil L1, the supplementary discharge generation direct current of filtering energy storage capacitor Co is exported successively by each dividing potential drop electric capacity during at input AC electricity negative half period; Above-mentioned pressure-stabilizing constant flow control circuit is by sampling voltage signal and sampling current signal are processed to direct voltage and the stable circuit of direct current that rear feedback effect is exported with assurance main circuit in above-mentioned main circuit.
Further scheme is: above-mentioned main circuit comprises dividing potential drop discharge circuit, filtering energy storage capacitor Co, the first electronic switch Q1), the second electronic switch Q2, diode Do2, sustained diode o1 and inductance coil L1;
Dividing potential drop discharge circuit has n level, and dividing potential drop discharge circuits at different levels are electrically connected to successively; Dividing potential drop discharge circuits at different levels form by dividing potential drop electric capacity, rectification diode and 2 isolating diodes; Dividing potential drop discharge circuits at different levels all have input, the first conllinear end, the first output, the second output and ground; Dividing potential drop electric capacity is electrochemical capacitor; 2 isolating diodes are divided into the first isolating diode and the second isolating diode; The positive pole of rectification diode is input; The negative pole of rectification diode, the anodal conllinear of the positive pole of the second isolating diode, dividing potential drop electric capacity and form common junction, this common junction is the first conllinear end; The negative electricity of the negative pole of dividing potential drop electric capacity and the first isolating diode is connected and forms common junction, and this common junction is the first output; The negative pole of the second isolating diode is the second output; The positive pole of the first isolating diode is earth terminal; Wherein, the 1st fraction of main circuit presses discharge circuit by the diode D12 as rectifier diode, as the electrochemical capacitor C1 of dividing potential drop electric capacity, form as the diode D11 of the first isolating diode with as the diode D13 of the second isolating diode; The positive pole of diode D12 had been both the input that the 1st fraction is pressed discharge circuit, also be the alternating current input of main circuit, the n fraction of main circuit presses discharge circuit by the diode Dn2 as rectifier diode, as the electrochemical capacitor Cn of dividing potential drop electric capacity, form as the diode Dn1 of the first isolating diode with as the diode Dn3 of the second isolating diode; The positive pole of diode Dn2 is the input that n fraction is pressed discharge circuit, and this input is also that n-1 fraction presses the first output of discharge circuit to be electrically connected to upper level; The positive level conllinear of the positive pole of the negative pole of diode Dn2, electrochemical capacitor Cn and diode Dn3 and form common junction, this common junction is the first conllinear end, is also the pressure-stabilizing constant flow control circuit power output end of main circuit;
The second output of dividing potential drop discharge circuits at different levels is all connected in the input of the first electronic switch Q1; The negative pole conllinear of one end of the output of the first electronic switch Q1, inductance coil L1 and sustained diode o1; The plus earth of sustained diode o1; The positive pole of the other end of inductance coil L1, filtering energy storage capacitor Co and the negative pole conllinear of diode Do2 and form common junction, this common junction is the DC power output end of main circuit; The equal ground connection of output of the negative pole of filtering energy storage capacitor Co and the second electronic switch Q2; The input of the positive pole of diode Do2 and the second electronic switch Q2 all presses the first output of discharge circuit to be electrically connected to n fraction; The control end of the first electronic switch Q1 is the first control signal input of main circuit; The control end of the second electronic switch Q2 is the second control signal input of main circuit;
The progression n of the dividing potential drop discharge circuit of main circuit is according to calculating formula n=(Vac – Vout)/(m
*vout
)calculate, wherein Vac is the alternating voltage to the positive pole input of diode D12, and Vout is that the span of m is 1 to 6 at the direct voltage of the positive pole output of filtering energy storage capacitor Co.
Further scheme is: the first above-mentioned electronic switch Q1 is NPN type triode, positive-negative-positive triode or common collection-common collector of being comprised of 2 positive-negative-positive triodes; When the first electronic switch Q1 is NPN type triode, the base stage of this NPN type triode is the control end of the first electronic switch Q1, the collector electrode of this NPN type triode is the input of the first electronic switch Q1, and the emitter of this NPN type triode is the output of the first electronic switch Q1; When the first electronic switch Q1 is positive-negative-positive triode, the base stage of this positive-negative-positive triode is the control end of the first electronic switch Q1, the emitter of this positive-negative-positive triode is the input of the first electronic switch Q1, and the collector electrode of this positive-negative-positive triode is the output of the first electronic switch Q1; When the first electronic switch Q1 is the common collection-common collector being comprised of 2 positive-negative-positive triodes, the base stage of this composite pipe circuit is the control end of the first electronic switch Q1, the emitter of this composite pipe circuit is the input of the first electronic switch Q1, and the collector electrode of this composite pipe circuit is the output of the first electronic switch Q1;
The second described electronic switch Q2 is the collector of NPN type triode, positive-negative-positive triode or the common collection that is comprised of 2 positive-negative-positive triodes-altogether; When the second electronic switch Q2 is NPN type triode, the base stage of this NPN type triode is the control end of the second electronic switch Q2, the collector electrode of this NPN type triode is the input of the second electronic switch Q2, and the emitter of this NPN type triode is the output of the second electronic switch Q2; When the second electronic switch Q2 is positive-negative-positive triode, the base stage of this positive-negative-positive triode is the control end of the second electronic switch Q2, the emitter of this positive-negative-positive triode is the input of the second electronic switch Q2, and the collector electrode of this positive-negative-positive triode is the output of the second electronic switch Q2; When the second electronic switch Q2 is the common collection-common collector being comprised of 2 positive-negative-positive triodes, the base stage of this composite pipe circuit is the control end of the second electronic switch Q2, the emitter of this composite pipe circuit is the input of the second electronic switch Q2, and the collector electrode of this composite pipe circuit is the output of the second electronic switch Q2.
Further scheme is: above-mentioned pressure-stabilizing constant flow control circuit comprises two voltage comparator U1, triode Q3, diode D1, diode D2, resistance R 1, resistance R 3, resistance R 9, sampling resistor Rf and reference voltage circuit; Described reference voltage circuit is comprised of resistance R 4, resistance R 5 and the resistance R 6 of three end reference voltage stabilizing source U2, resistance R 2 and series connection successively; Three anodes of end reference voltage stabilizing source U2 are, one end of the base stage of triode Q3, resistance R 6 and one end of sampling resistor Rf are shared and formed common junction, and this common junction is the sampling current input of pressure-stabilizing constant flow control circuit; The other end conllinear of the emitter of triode Q3 and sampling resistor Rf and form common junction, this common junction is the sampling current output of pressure-stabilizing constant flow control circuit; Three negative electrodes of end reference voltage stabilizing source U2 are, the second in-phase input end conllinear of one end of one end of resistance R 2, resistance R 4 and two voltage comparator U1; Three reference levels of end reference voltage stabilizing source U2 are, one end conllinear of the other end of resistance R 6 and resistance R 5; One end conllinear of the first inverting input of two voltage comparator U1, the positive pole of diode D1 and resistance R 9; The other end conllinear of the other end of the other end of resistance R 9, resistance R 4 and resistance R 5; The other end conllinear of the power end of two voltage comparator U1 and the resistance R of reference voltage circuit 2 and form common junction, this common junction is the power end of pressure-stabilizing constant flow control circuit; One end of resistance R 1 is the first control signal output of pressure-stabilizing constant flow control circuit; The other end of resistance R 1 is electrically connected to the first output of two voltage comparator U1; One end of resistance R 3 is the second control signal output of pressure-stabilizing constant flow control circuit; The second output conllinear of anodal and two voltage comparator U1 of the other end of resistance R 3, diode D2; The collector electrode conllinear of the negative pole of the negative pole of diode D2, diode D1 and triode Q3; The first in-phase input end of two voltage comparator U1 and the second inverting input are jointly as the sampling voltage input of pressure-stabilizing constant flow control circuit.
Further scheme is: the dividing potential drop capacitor C 1 to Cn of above-mentioned dividing potential drop discharge circuits at different levels and the capacitance of filtering energy storage capacitor Co all equate.
Good effect of the present invention is: the components and parts such as conventional transistor, crystal diode, comparator, voltage-stabiliser tube and resistance, electric capacity for the present invention, design by circuit has not realized can provide the output of pressure-stabilizing constant flow direct current to drive the power supply of illuminating LED or the work of series LED group with transformer, thereby owing to having omitted transformer, power volume is reduced, weight saving, cost.
Accompanying drawing explanation
Fig. 1 is a kind of circuit block diagram of the present invention;
Fig. 2 is the electrical schematic diagram of Fig. 1;
Fig. 3 is dividing potential drop discharge circuits at different levels in Fig. 2 equivalent circuit diagrams when alternating current positive half period;
Fig. 4 is dividing potential drop discharge circuits at different levels in Fig. 2 equivalent circuit diagrams when alternating current negative half-cycle.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
See Fig. 1, transless LED for illumination power supply of the present invention is comprised of main circuit 1, pressure-stabilizing constant flow control circuit 2 and LED power interface J1.LED power interface J1 has positive pole and negative pole; Main circuit 1 is provided with alternating current input A1, DC power output end A2, the first control signal input A3, the second control signal input A4 and pressure-stabilizing constant flow control circuit power output end A5; Pressure-stabilizing constant flow control circuit 2 is provided with sampling voltage input B2, the first control signal output B3, the second control signal output B4, power end B5, sampling current input B6 and sampling current output B7; The sampling voltage input B2 of pressure-stabilizing constant flow control circuit 2 is electrically connected to the DC power output end A2 of main circuit 1; The first control signal input A3 of main circuit 1 is electrically connected to the first control signal output B3 of pressure-stabilizing constant flow control circuit 2; The second control signal input A4 of main circuit 1 is electrically connected to the second control signal output B4 of pressure-stabilizing constant flow control circuit 2; The pressure-stabilizing constant flow control circuit power output end A5 of main circuit 1 is electrically connected to the power end B5 of pressure-stabilizing constant flow control circuit 2; The sampling current input B6 of pressure-stabilizing constant flow control circuit 2 is connected with the negative electricity of LED power interface J1; The sampling current output B7 ground connection of pressure-stabilizing constant flow control circuit 2; The positive pole of LED power interface J1 is electrically connected to the DC power output end A2 of main circuit 1.
See Fig. 2, aforesaid main circuit 1 is comprised of dividing potential drop discharge circuit, filtering energy storage capacitor Co, the first electronic switch Q1, the second electronic switch Q2, diode Do2, sustained diode o1 and inductance coil L1;
Dividing potential drop discharge circuit has n level, and dividing potential drop discharge circuits at different levels are electrically connected to successively; Dividing potential drop discharge circuits at different levels form by dividing potential drop electric capacity, rectification diode and 2 isolating diodes.Dividing potential drop discharge circuits at different levels all have input, the first conllinear end, the first output, the second output and ground.Dividing potential drop electric capacity is electrochemical capacitor; 2 isolating diodes are divided into the first isolating diode and the second isolating diode.The positive pole of rectification diode is input; The negative pole of rectification diode, the anodal conllinear of the positive pole of the second isolating diode, dividing potential drop electric capacity and form common junction, this common junction is the first conllinear end; The negative electricity of the negative pole of dividing potential drop electric capacity and the first isolating diode is connected and forms common junction, and this common junction is the first output; The negative pole of the second isolating diode is the second output; The positive pole of the first isolating diode is earth terminal.The earth terminal of dividing potential drop discharge circuits at different levels forms the earth terminal of main circuit 1 jointly.Wherein, the 1st fraction of main circuit 1 presses discharge circuit by the diode D12 as rectifier diode, as the electrochemical capacitor C1 of dividing potential drop electric capacity, form as the diode D11 of the first isolating diode with as the diode D13 of the second isolating diode.The positive pole of diode D12 had been both the input that the 1st fraction is pressed discharge circuit, was also the alternating current input A1 of main circuit 1.The 2nd fraction of main circuit 1 presses discharge circuit by the electrochemical capacitor C2 as dividing potential drop electric capacity, as the diode D22 of rectifier diode, form as the diode D21 of the first isolating diode with as the diode D23 of the second isolating diode.Just very the 2nd fraction of diode D22 is pressed the input of discharge circuit, and this input presses the first output of discharge circuit to be electrically connected to the 1st fraction.The n fraction of main circuit 1 presses discharge circuit by the diode Dn2 as rectifier diode, as the electrochemical capacitor Cn of dividing potential drop electric capacity, form as the diode Dn1 of the first isolating diode with as the diode Dn3 of the second isolating diode.The just very n fraction of diode Dn2 is pressed the input of discharge circuit, and this input is also that n-1 fraction presses the first output of discharge circuit to be electrically connected to upper level.The positive level conllinear of the positive pole of the negative pole of diode Dn2, electrochemical capacitor Cn and diode Dn3 and form this common junction of common junction and be the first conllinear end is also the controlling circuit of voltage regulation power output end A5 of main circuit 1.
The second output of dividing potential drop discharge circuits at different levels is all connected in the input of the first electronic switch Q1; The negative pole conllinear of one end of the output of the first electronic switch Q1, inductance coil L1 and sustained diode o1; The plus earth of sustained diode o1; The positive pole of the other end of inductance coil L1, filtering energy storage capacitor Co and the negative pole conllinear of diode Do2 and form common junction, this common junction is the DC power output end A2 of main circuit 1; The equal ground connection of output of the negative pole of filtering energy storage capacitor Co and the second electronic switch Q2; The input of the positive pole of diode Do2 and the second electronic switch Q2 all presses the first output of discharge circuit to be electrically connected to n fraction; The control end of the first electronic switch Q1 is the first control signal input A3 of main circuit 1; The control end of the second electronic switch Q2 is the second control signal input A4 of main circuit 1.
Aforesaid the first electronic switch Q1 can be the collector of NPN type triode, positive-negative-positive triode or the common collection that is comprised of 2 positive-negative-positive triodes-altogether; The common collection that the present embodiment is preferably comprised of 2 positive-negative-positive triodes-common collector.When the first electronic switch Q1 is NPN type triode, the base stage of this NPN type triode is the control end of the first electronic switch Q1, the collector electrode of this NPN type triode is the input of the first electronic switch Q1, and the emitter of this NPN type triode is the output of the first electronic switch Q1; When the first electronic switch Q1 is positive-negative-positive triode, the base stage of this positive-negative-positive triode is the control end of the first electronic switch Q1, the emitter of this positive-negative-positive triode is the input of the first electronic switch Q1, and the collector electrode of this positive-negative-positive triode is the output of the first electronic switch Q1; When the first electronic switch Q1 is the common collection-common collector being comprised of 2 positive-negative-positive triodes, the base stage of this composite pipe circuit is the control end of the first electronic switch Q1, the emitter of this composite pipe circuit is the input of the first electronic switch Q1, and the collector electrode of this composite pipe circuit is the output of the first electronic switch Q1;
The second described electronic switch Q2 can be the collector of NPN type triode, positive-negative-positive triode or the common collection that is comprised of 2 positive-negative-positive triodes-altogether.The common collection that the present embodiment is preferably comprised of 2 positive-negative-positive triodes-common collector.When the second electronic switch Q2 is NPN type triode, the base stage of this NPN type triode is the control end of the second electronic switch Q2, the collector electrode of this NPN type triode is the input of the second electronic switch Q2, and the emitter of this NPN type triode is the output of the second electronic switch Q2; When the second electronic switch Q2 is positive-negative-positive triode, the base stage of this positive-negative-positive triode is the control end of the second electronic switch Q2, the emitter of this positive-negative-positive triode is the input of the second electronic switch Q2, and the collector electrode of this positive-negative-positive triode is the output of the second electronic switch Q2; When the second electronic switch Q2 is the common collection-common collector being comprised of 2 positive-negative-positive triodes, the base stage of this composite pipe circuit is the control end of the second electronic switch Q2, the emitter of this composite pipe circuit is the input of the second electronic switch Q2, and the collector electrode of this composite pipe circuit is the output of the second electronic switch Q2.Aforesaid pressure-stabilizing constant flow control circuit 2 is comprised of two voltage comparator U1, NPN type triode Q3, diode D1, diode D2, resistance R 1, resistance R 3, resistance R 9, sampling resistor Rf and reference voltage circuit, and reference voltage circuit is comprised of resistance R 4, resistance R 5 and the resistance R 6 of three end reference voltage stabilizing source U2, resistance R 2 and series connection successively.
In the present embodiment, the preferred LM393 of the model of two voltage comparator U1.The preferred LM431A of model of three end reference voltage stabilizing source U2.Built-in two comparators of two voltage comparator U1 of LM393, have 1 to 8 pin, and its VCC end is 8 pin, and VSS end is 4 pin, and the first in-phase input end is 3 pin, and the first inverting input is 2 pin, and the first output is 1 pin; The second in-phase input end is 5 pin, and the second inverting input is 6 pin, and the second output is 7 pin.
Three anodes of end reference voltage stabilizing source U2 are, one end of the base stage of triode Q3, resistance R 6 and one end of sampling resistor Rf have common junction, and this common junction is the sampling current input B6 of pressure-stabilizing constant flow control circuit 2; The other end of the emitter of triode Q3 and sampling resistor Rf has common junction, and this common junction is the sampling current output B7 of pressure-stabilizing constant flow control circuit 2; The second in-phase input end 5 pin of one end of three negative electrodes of end reference voltage stabilizing source U2 and one end of resistance R 2, resistance R 4 and two voltage comparator U1 have common junction; Three reference levels of end reference voltage stabilizing source U2 are, one end conllinear of the other end of resistance R 6 and resistance R 5; The first inverting input 2 pin, the positive pole of diode D1 and one end conllinear of resistance R 9 of two voltage comparator U1; The other end conllinear of the other end of the other end of resistance R 9, resistance R 4 and resistance R 5; The power end of two voltage comparator U1 is also that VCC holds the other end of the resistance R 2 of 8 pin and reference voltage circuit to have common junction, and this common junction is the power end B5 of pressure-stabilizing constant flow control circuit 2; One end of resistance R 1 is the first control signal output B3 of pressure-stabilizing constant flow control circuit 2; The other end of resistance R 1 is electrically connected to the first output 1 pin of two voltage comparator U1; One end of resistance R 3 is the second control signal output B4 of pressure-stabilizing constant flow control circuit 2; The second output 7 pin conllinear of anodal and two voltage comparator U1 of the other end of resistance R 3, diode D2; The collector electrode conllinear of the negative pole of the negative pole of diode D2, diode D1 and triode Q3; The first in-phase input end 3 pin of two voltage comparator U1 and the second inverting input 6 pin are the sampling voltage input B2 of pressure-stabilizing constant flow control circuit 2 jointly.The VSS of two voltage comparator U1 holds 4 pin ground connection.
In the present embodiment, aforesaid dividing potential drop capacitor C 1, C2 ... Cn and filtering energy storage capacitor Co are electrochemical capacitor, and capacitance all equates.
See Fig. 2, referring to Fig. 3 and Fig. 4, this operation principle of transformerless DC voltage-stabilized power supply of the present embodiment and mode are as following:
The LED lamp pearl group of LED lamp pearl or series connection is electrically connected to by the LED power interface J1 of the transformerless DC voltage-stabilized power supply with the present embodiment.
The alternating current AC of external 220V inputs by the alternating current input A1 of main circuit 1, when the positive half period of alternating current AC, electric current through D12, C1, D22, C2 ... Dn2, Cn, Do2, Co to C1, C2 ... Cn-1, Cn, Co electric capacity charge, at charge cycle, known according to circuit theory, D11 in circuit, D13, D21, D23 ... Dn1, Dn3 are inoperative, and charging equivalent electric circuit as shown in Figure 3.
Output voltage during charging on filtering energy storage capacitor Co provides operating voltage and provides sampling voltage for pressure-stabilizing constant flow control circuit 2 for LED, the pressure limiting of the output voltage on filtering energy storage capacitor Co is controlled and by two voltage comparator U1, output voltage V out and reference voltage Vref 1 is compared to realize: when Vout > Vref1 the first output 1 pin output low level of two voltage comparator U1, simultaneously, when charging current is greater than setting electric current, it is also that the rising of transistor base voltage makes triode Q3 conducting that pressure drop on sampling resistor Rf increases, both cause triode Q2 conducting, and bypass diode Do2 and capacitor C o after triode Q2 conducting, thereby stop the charging to capacitor C o, guarantee that output voltage V out can not be greater than Vref1 and output current and can not be greater than setting electric current.
When the alternating current AC of 220V is during at negative half-cycle, circuit stops the charging to each electric capacity, enters the current drain cycle, and in the current drain cycle, according to circuit theory, dividing potential drop electric capacity changes parallel circuits into, and its equivalent circuit diagram as shown in Figure 4.Output voltage on filtering energy storage capacitor Co provides operating voltage and provides sampling voltage for pressure-stabilizing constant flow control circuit for LED, the pressure limiting of the output voltage on filtering energy storage capacitor Co is controlled and by two voltage comparator U1, Vout and Vref2 is compared to realize, the first output 1 pin output low level of two voltage comparator U1 when Vout < Vref2, make Q1 conducting, connecting dividing potential drop capacitor C 1 ~ Cn makes its parallel connection carry out boost charge to Co, dividing potential drop capacitor C 1 from its positive pole through D13, Q1, L1, Co, D11 forms a discharge loop to Co supplemental current to the negative pole of capacitor C 1, other dividing potential drop capacitor C 2-Cn operation principle is identical with C1, to guarantee Vout output voltage stabilization or constant output current, guarantee that Vout output can not be less than Vref2.During boost charge, the constant current of DC power supply output current is controlled and is realized by Q3, the electric current flowing through on sampling resistor Rf surpasses while setting electric current, its voltage drop reaches 0.7V, Q3 conducting, the diode D1 joining with the collector electrode of Q3 drags down the first negative input end of two voltage comparator U1, the first output output LOW voltage of forbidding two voltage comparator U1, stop triode Q1 conducting, stop the boost charge to power filter energy storage capacitor Co, due between the first negative input end of two voltage comparator U1 and reference voltage Vref 2, by R9, be connected, drag down the first negative input end of two voltage comparator U1, can not have influence on reference voltage Vref 2, the diode D2 simultaneously joining with the collector electrode of Q3 drags down the base stage of Q2, makes Q2 conducting, and bypass Do2, Co, stop the boost charge to power filter energy storage capacitor Co.The authority that constant current is controlled is controlled higher than pressure limiting, when Q3 conducting time limit pressure-controlled inoperative.
According to following steps, determine the transless illuminating LED power supply related parameter choosing of the embodiment of the present invention as shown in Figure 2:
First determine output voltage values Vout and the current value I of illuminating LED power supply:
Vout = LEDs * 3.5 （1）
I = 0.3 A （2）
Vout is DC power output voltage value, and LEDs is the quantity of how many illuminating LEDs of demand motive, and the forward voltage drop of 1 watt of illuminating LED is generally 3.5V, and electric current I is 300mA.
By LED constant current controlling value I, can determine the resistance value of sampling resistor Rf, according to formula (3), calculating Rf is 2.3 ohm
Rf = 0.7 / I （3）
Reference voltage is provided by three end reference voltage stabilizing source U2, selects R4, R5, R6 resistance to determine reference voltage Vref 1, Vref2 magnitude of voltage.In application, R6 generally may be selected to be 2.5K ohm, and R4 determines VD
vout permissible error difference, generally may be selected to be 200 ohm in application, R5 can calculate according to formula (4).Vref1, Vref2 magnitude of voltage are determined according to computing formula (5), (6).
R5 = R6 * Vout / 2.5 - R6 - R4 / 2 ( 4)
Vref1 = 2.5 * ( R4+R5+R6 ) / R6 （5）
Vref2 = 2.5 * ( R5+R6 ) / R6 ( 6)
The progression n of the dividing potential drop discharge circuit of main circuit 1, is also that dividing potential drop electric capacity progression is selected, and selects how many fraction piezoelectricity to hold and can, according to the determined Vout of formula (1), by formula (7), calculate:
n = ( Vac – Vout ) / (m
* Vout
)（7）
The span of Coefficient m is wherein 1 to 6.Rule of thumb, select dividing potential drop capacitor C 1, C2 ... the capacitance of Cn and filtering energy storage capacitor Co all equates, the range of choice of dividing potential drop capacitance voltage the best is between 1.5 to 3 times of output voltage V out, can obtain direct current constant current and the pressure limiting output of better performances, also the optimum valuing range that is m is between 1.5 to 3, thereby can determine the number n of dividing potential drop electric capacity.Take input ac voltage as 220V be example, if the LED quantity of demand motive is 4, according to formula (1), calculating output dc voltage Vout is 14V, if m gets 1, can calculate n is 15; If m gets 6, can calculate n is 2; Between the optimum valuing range 1.5 to 3 of m, determine that m gets 2, can calculate n is 7, that is to say, selects 7 dividing potential drop electric capacity in main circuit 1, by the circuit of the present embodiment, can drive 4 LED of the present embodiment, and operating current voltage is the most stable.
Above embodiment is the explanation to the specific embodiment of the present invention; but not limitation of the present invention; person skilled in the relevant technique without departing from the spirit and scope of the present invention; can also make various conversion and variation and obtain the corresponding technical scheme being equal to, therefore all technical schemes that are equal to all should be included into scope of patent protection of the present invention.
Claims (4)
1. a transless LED for illumination power supply, is characterized in that: comprise main circuit (1), pressure-stabilizing constant flow control circuit (2) and LED power interface (J1); Described LED power interface (J1) has positive pole and negative pole; Described main circuit (1) is provided with alternating current input (A1), DC power output end (A2), the first control signal input (A3), the second control signal input (A4) and pressure-stabilizing constant flow control circuit power output end (A5); Described pressure-stabilizing constant flow control circuit (2) is provided with sampling voltage input (B2), the first control signal output (B3), the second control signal output (B4), power end (B5), sampling current input (B6) and sampling current output (B7); The sampling voltage input (B2) of described pressure-stabilizing constant flow control circuit (2) is electrically connected to the DC power output end (A2) of main circuit (1); The first control signal input (A3) of main circuit (1) is electrically connected to the first control signal output (B3) of pressure-stabilizing constant flow control circuit (2); The second control signal input (A4) of main circuit (1) is electrically connected to the second control signal output (B4) of pressure-stabilizing constant flow control circuit (2); The pressure-stabilizing constant flow control circuit power output end (A5) of main circuit (1) is electrically connected to the power end (B5) of pressure-stabilizing constant flow control circuit (2); The sampling current input (B6) of pressure-stabilizing constant flow control circuit (2) is connected with the negative electricity of LED power interface (J1); Sampling current output (B7) ground connection of pressure-stabilizing constant flow control circuit (2); The positive pole of LED power interface (J1) is electrically connected to the DC power output end (A2) of main circuit (1); Described main circuit (1) be a kind of when the positive half cycle of input AC electricity by some spaced rectifier diodes and dividing potential drop capacitances in series dividing potential drop and the circuit that produces direct current output at filtering energy storage capacitor Co, by corresponding isolating diode, shared the first electronic switch Q1 and inductance coil L1, the supplementary discharge generation direct current of filtering energy storage capacitor Co is exported successively by each dividing potential drop electric capacity during at input AC electricity negative half period; Described pressure-stabilizing constant flow control circuit (2) be by sampling voltage signal and sampling current signal are processed rear feedback effect in described main circuit (1) to guarantee direct voltage and the stable circuit of direct current of main circuit (1) output;
Described main circuit (1) comprises dividing potential drop discharge circuit, filtering energy storage capacitor Co, the first electronic switch Q1, the second electronic switch Q2, diode Do2, sustained diode o1 and inductance coil L1;
Dividing potential drop discharge circuit has n level, and dividing potential drop discharge circuits at different levels are electrically connected to successively; Dividing potential drop discharge circuits at different levels form by dividing potential drop electric capacity, rectification diode and 2 isolating diodes; Dividing potential drop discharge circuits at different levels all have input, the first conllinear end, the first output, the second output and ground; Dividing potential drop electric capacity is electrochemical capacitor; 2 isolating diodes are divided into the first isolating diode and the second isolating diode; The positive pole of rectification diode is input; The negative pole of rectification diode, the anodal conllinear of the positive pole of the second isolating diode, dividing potential drop electric capacity and form common junction, this common junction is the first conllinear end; The negative electricity of the negative pole of dividing potential drop electric capacity and the first isolating diode is connected and forms common junction, and this common junction is the first output; The negative pole of the second isolating diode is the second output; The positive pole of the first isolating diode is earth terminal; Wherein, the 1st fraction of main circuit (1) presses discharge circuit by the diode D12 as rectifier diode, as the electrochemical capacitor C1 of dividing potential drop electric capacity, form as the diode D11 of the first isolating diode with as the diode D13 of the second isolating diode; The positive pole of diode D12 had been both the input that the 1st fraction is pressed discharge circuit, was also the alternating current input (A1) of main circuit (1); The n fraction of main circuit (1) presses discharge circuit by the diode Dn2 as rectifier diode, as the electrochemical capacitor Cn of dividing potential drop electric capacity, form as the diode Dn1 of the first isolating diode with as the diode Dn3 of the second isolating diode; The positive pole of diode Dn2 is the input that n fraction is pressed discharge circuit, and this input is also that n-1 fraction presses the first output of discharge circuit to be electrically connected to upper level; The anodal conllinear of the positive pole of the negative pole of diode Dn2, electrochemical capacitor Cn and diode Dn3 and form common junction, this common junction is the first conllinear end, is also the pressure-stabilizing constant flow control circuit power output end (A5) of main circuit (1);
The second output of dividing potential drop discharge circuits at different levels is all connected in the input of the first electronic switch Q1; The negative pole conllinear of one end of the output of the first electronic switch Q1, inductance coil L1 and sustained diode o1; The plus earth of sustained diode o1; The positive pole of the other end of inductance coil L1, filtering energy storage capacitor Co and the negative pole conllinear of diode Do2 and form common junction, this common junction is the DC power output end (A2) of main circuit (1); The equal ground connection of output of the negative pole of filtering energy storage capacitor Co and the second electronic switch Q2; The input of the positive pole of diode Do2 and the second electronic switch Q2 all presses the first output of discharge circuit to be electrically connected to n fraction; The control end of the first electronic switch Q1 is the first control signal input (A3) of main circuit (1); The control end of the second electronic switch Q2 is the second control signal input (A4) of main circuit (1);
The progression n of the dividing potential drop discharge circuit of main circuit (1) is according to calculating formula n=(Vac – Vout)/(m
*vout
)calculate, wherein Vac is the alternating voltage to the positive pole input of diode D12, and Vout is that the span of m is 1 to 6 at the direct voltage of the positive pole output of filtering energy storage capacitor Co.
2. transless LED for illumination power supply according to claim 1, is characterized in that: the first described electronic switch Q1 is the collector of NPN type triode, positive-negative-positive triode or the common collection that is comprised of 2 positive-negative-positive triodes-altogether; When the first electronic switch Q1 is NPN type triode, the base stage of this NPN type triode is the control end of the first electronic switch Q1, the collector electrode of this NPN type triode is the input of the first electronic switch Q1, and the emitter of this NPN type triode is the output of the first electronic switch Q1; When the first electronic switch Q1 is positive-negative-positive triode, the base stage of this positive-negative-positive triode is the control end of the first electronic switch Q1, the emitter of this positive-negative-positive triode is the input of the first electronic switch Q1, and the collector electrode of this positive-negative-positive triode is the output of the first electronic switch Q1; When the first electronic switch Q1 is the common collection-common collector being comprised of 2 positive-negative-positive triodes, the common collection that these 2 positive-negative-positive triodes form-base stage of collector is the control end of the first electronic switch Q1 altogether, the common collection that these 2 positive-negative-positive triodes form-emitter of collector is the input of the first electronic switch Q1 altogether, and the common collection that these 2 positive-negative-positive triodes form-collector electrode of collector is the output of the first electronic switch Q1 altogether;
The second described electronic switch Q2 is the collector of NPN type triode, positive-negative-positive triode or the common collection that is comprised of 2 positive-negative-positive triodes-altogether; When the second electronic switch Q2 is NPN type triode, the base stage of this NPN type triode is the control end of the second electronic switch Q2, the collector electrode of this NPN type triode is the input of the second electronic switch Q2, and the emitter of this NPN type triode is the output of the second electronic switch Q2; When the second electronic switch Q2 is positive-negative-positive triode, the base stage of this positive-negative-positive triode is the control end of the second electronic switch Q2, the emitter of this positive-negative-positive triode is the input of the second electronic switch Q2, and the collector electrode of this positive-negative-positive triode is the output of the second electronic switch Q2; When the second electronic switch Q2 is the common collection-common collector being comprised of 2 positive-negative-positive triodes, the common collection that these 2 positive-negative-positive triodes form-base stage of collector is the control end of the second electronic switch Q2 altogether, the common collection that these 2 positive-negative-positive triodes form-emitter of collector is the input of the second electronic switch Q2 altogether, and the common collection that these 2 positive-negative-positive triodes form-collector electrode of collector is the output of the second electronic switch Q2 altogether.
3. transless LED for illumination power supply according to claim 2, is characterized in that: described pressure-stabilizing constant flow control circuit (2) comprises two voltage comparator U1, triode Q3, diode D1, diode D2, resistance R 1, resistance R 3, resistance R 9, sampling resistor Rf and reference voltage circuit; Described reference voltage circuit is comprised of resistance R 4, resistance R 5 and the resistance R 6 of three end reference voltage stabilizing source U2, resistance R 2 and series connection successively; Three anodes of end reference voltage stabilizing source U2 are, one end of the base stage of triode Q3, resistance R 6 and one end of sampling resistor Rf are shared and formed common junction, and this common junction is the sampling current input (B6) of pressure-stabilizing constant flow control circuit (2); The other end conllinear of the emitter of triode Q3 and sampling resistor Rf and form common junction, this common junction is the sampling current output (B7) of pressure-stabilizing constant flow control circuit (2); Three negative electrodes of end reference voltage stabilizing source U2 are, the second in-phase input end conllinear of one end of one end of resistance R 2, resistance R 4 and two voltage comparator U1; Three reference levels of end reference voltage stabilizing source U2 are, one end conllinear of the other end of resistance R 6 and resistance R 5; One end conllinear of the first inverting input of two voltage comparator U1, the positive pole of diode D1 and resistance R 9; The other end conllinear of the other end of the other end of resistance R 9, resistance R 4 and resistance R 5; The other end conllinear of the power end of two voltage comparator U1 and the resistance R of reference voltage circuit 2 and form common junction, this common junction is the power end (B5) of pressure-stabilizing constant flow control circuit (2); One end of resistance R 1 is the first control signal output (B3) of pressure-stabilizing constant flow control circuit (2); The other end of resistance R 1 is electrically connected to the first output of two voltage comparator U1; One end of resistance R 3 is the second control signal output (B4) of pressure-stabilizing constant flow control circuit (2); The second output conllinear of anodal and two voltage comparator U1 of the other end of resistance R 3, diode D2; The collector electrode conllinear of the negative pole of the negative pole of diode D2, diode D1 and triode Q3; The first in-phase input end of two voltage comparator U1 and the second inverting input are jointly as the sampling voltage input (B2) of pressure-stabilizing constant flow control circuit (2).
4. according to the transless LED for illumination power supply described in claim 2 or 3, it is characterized in that: the capacitance of the electrochemical capacitor C1 to Cn as dividing potential drop electric capacity in described dividing potential drop discharge circuits at different levels and filtering energy storage capacitor Co all equates.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410277860.XA CN104010425B (en) | 2012-04-13 | 2012-04-13 | The transformerless power supply of LED for illumination |
| CN201410276190.XA CN104039051B (en) | 2012-04-13 | 2012-04-13 | Transformerless LED for illumination power supply |
| CN201210109725.5A CN102665327B (en) | 2012-04-13 | 2012-04-13 | Light-emitting diode power supply for illumination without transformer |
| CN201410275974.0A CN104023451B (en) | 2012-04-13 | 2012-04-13 | The transformerless power supply of illuminating light-emitting diode |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210109725.5A CN102665327B (en) | 2012-04-13 | 2012-04-13 | Light-emitting diode power supply for illumination without transformer |
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| CN201410275974.0A Division CN104023451B (en) | 2012-04-13 | 2012-04-13 | The transformerless power supply of illuminating light-emitting diode |
| CN201410277860.XA Division CN104010425B (en) | 2012-04-13 | 2012-04-13 | The transformerless power supply of LED for illumination |
| CN201410276190.XA Division CN104039051B (en) | 2012-04-13 | 2012-04-13 | Transformerless LED for illumination power supply |
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| CN102665327B true CN102665327B (en) | 2014-08-06 |
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| CN201410275974.0A Active CN104023451B (en) | 2012-04-13 | 2012-04-13 | The transformerless power supply of illuminating light-emitting diode |
| CN201210109725.5A Active CN102665327B (en) | 2012-04-13 | 2012-04-13 | Light-emitting diode power supply for illumination without transformer |
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| CN201410275974.0A Active CN104023451B (en) | 2012-04-13 | 2012-04-13 | The transformerless power supply of illuminating light-emitting diode |
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| CN104010425A (en) * | 2012-04-13 | 2014-08-27 | 江苏理工学院 | Non-transformer power source of LED for lighting |
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| TW201414348A (en) * | 2012-09-17 | 2014-04-01 | Luxul Technology Inc | Full-domain linear LED driving circuit capable of resolving flicker |
| CN104219842B (en) * | 2014-08-29 | 2017-09-29 | 深圳市奋勇光电有限公司 | Led constant current device |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN104039051A (en) | 2014-09-10 |
| CN104023451A (en) | 2014-09-03 |
| CN104023451B (en) | 2016-03-30 |
| CN104010425B (en) | 2016-02-03 |
| CN104039051B (en) | 2016-02-03 |
| CN102665327A (en) | 2012-09-12 |
| CN104010425A (en) | 2014-08-27 |
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