CN104010425A - Transformer-free power supply of light-emitting diode for illumination - Google Patents
Transformer-free power supply of light-emitting diode for illumination Download PDFInfo
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- 238000005286 illumination Methods 0.000 title claims abstract description 10
- 239000003990 capacitor Substances 0.000 claims abstract description 52
- 238000005070 sampling Methods 0.000 claims abstract description 49
- 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
- 239000000203 mixture Substances 0.000 claims description 9
- 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
- 238000002955 isolation Methods 0.000 abstract 1
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- 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
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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Abstract
The invention provides a transformer-free power supply of a light emitting diode for illumination, which comprises a main circuit, a voltage-stabilizing constant-current control circuit and a light emitting diode power supply interface, wherein the main circuit is connected with the voltage-stabilizing constant-current control circuit; the main circuit is a circuit which divides voltage through a plurality of rectifier diodes and voltage division capacitors which are arranged at intervals in series when alternating current is input for a positive half cycle, generates direct current output on the filtering energy storage capacitor, and generates direct current output by supplementing discharge to the filtering energy storage capacitor through corresponding isolation diodes, a shared first electronic switch and an inductor by each voltage division capacitor when alternating current is input for a negative half cycle; the voltage-stabilizing constant-current control circuit is a circuit which processes the sampling voltage signal and the sampling current signal and feeds the processed sampling voltage signal and the sampling current signal back to the main circuit to ensure the working voltage and the current of the light-emitting diode to be stable. The invention omits a transformer of a common light emitting diode lighting power supply, thereby reducing the volume of the power supply, lightening the weight and reducing the cost.
Description
The application is that application number is 201210109725.5, and the applying date is on April 13rd, 2012, and invention and created name is the divisional application of the application for a patent for invention of " transless LED for illumination power supply ".
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 a transformer for 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 transformerless power supply of LED for illumination, 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 with the DC power output end of main circuit; The first control signal input of main circuit is electrically connected with the first control signal output of pressure-stabilizing constant flow control circuit; The second control signal input of main circuit is electrically connected with 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 with 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; The positive pole of LED power interface be electrically connected with the DC power output end of main circuit; Above-mentioned main circuit be a kind of in the time of 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 guarantee main circuit in above-mentioned main circuit.
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 successively; Dividing potential drop discharge circuits at different levels are by dividing potential drop electric capacity, rectification diode and 2 isolating diode compositions; 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 positive pole of the second isolating diode, the anodal conllinear of dividing potential drop electric capacity and form common junction, this common junction is the first conllinear end; The negative pole of dividing potential drop electric capacity is connected and forms common junction with the negative electricity of the first isolating diode, 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 of n fraction pressure discharge circuit, and this input is also that n-1 fraction presses the first output of discharge circuit to be electrically connected with upper level; The positive level conllinear of the negative pole of diode Dn2, the positive pole of 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 the output of the first electronic switch Q1, one end of inductance coil L1 and sustained diode o1; The plus earth of sustained diode o1; The other end, the positive pole of filtering energy storage capacitor Co and the negative pole conllinear of diode Do2 of inductance coil L1 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 with 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.
The first above-mentioned electronic switch Q1 is NPN type triode, positive-negative-positive triode or the common collection that is made up of 2 positive-negative-positive triodes-collector altogether; In the time that 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; In the time that 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; In the time that the first electronic switch Q1 is the common collection-common collector being made up 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 NPN type triode, positive-negative-positive triode or the common collection that is made up of 2 positive-negative-positive triodes-collector altogether; In the time that 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; In the time that 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; In the time that the second electronic switch Q2 is the common collection-common collector being made up 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.
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.
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 made up 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; The anode of three end reference voltage stabilizing source U2, the base stage of triode Q3, one end of resistance R 6 and one end of sampling resistor Rf are shared and are 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; One end of the negative electrode of three end reference voltage stabilizing source U2, one end of resistance R 2, resistance R 4 and the second in-phase input end conllinear of two voltage comparator U1; One end conllinear of the reference level of three end reference voltage stabilizing source U2, 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 resistance R 9, the other end of 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 with 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 the other end of resistance R 3, anodal and two voltage comparator U1 of diode D2; The collector electrode conllinear of the negative pole of diode D2, the negative pole of 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.
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, do not realize and 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 by the design of circuit, thereby owing to having omitted transformer, power volume is reduced, weight saving, cost.
Brief description of the drawings
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 in the time of alternating current positive half period;
Fig. 4 is dividing potential drop discharge circuits at different levels in Fig. 2 equivalent circuit diagrams in the time of 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, the transformerless power supply of LED for illumination of the present invention is made up 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 with the DC power output end A2 of main circuit 1; The first control signal input A3 of main circuit 1 is electrically connected with 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 with 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 with 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 with the DC power output end A2 of main circuit 1.
See Fig. 2, aforesaid main circuit 1 is made up 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 successively; Dividing potential drop discharge circuits at different levels are by dividing potential drop electric capacity, rectification diode and 2 isolating diode compositions.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 positive pole of the second isolating diode, the anodal conllinear of dividing potential drop electric capacity and form common junction, this common junction is the first conllinear end; The negative pole of dividing potential drop electric capacity is connected and forms common junction with the negative electricity of the first isolating diode, 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 with 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 with upper level.The positive level conllinear of the negative pole of diode Dn2, the positive pole of 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 the output of the first electronic switch Q1, one end of inductance coil L1 and sustained diode o1; The plus earth of sustained diode o1; The other end, the positive pole of filtering energy storage capacitor Co and the negative pole conllinear of diode Do2 of inductance coil L1 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 with 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 NPN type triode, positive-negative-positive triode or the common collection that is made up of 2 positive-negative-positive triodes-collector altogether; Common collection-collector altogether that the present embodiment is preferably made up of 2 positive-negative-positive triodes.In the time that 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; In the time that 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; In the time that the first electronic switch Q1 is the common collection-common collector being made up 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 NPN type triode, positive-negative-positive triode or the common collection that is made up of 2 positive-negative-positive triodes-collector altogether.Common collection-collector altogether that the present embodiment is preferably made up of 2 positive-negative-positive triodes.In the time that 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; In the time that 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; In the time that the second electronic switch Q2 is the common collection-common collector being made up 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 made up 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 made up 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.
The anode of three end reference voltage stabilizing source U2, the base stage of triode Q3, one end of 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; One end conllinear of the reference level of three end reference voltage stabilizing source U2, 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 resistance R 9, the other end of 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 with 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 the other end of resistance R 3, anodal and two voltage comparator U1 of diode D2; The collector electrode conllinear of the negative pole of diode D2, the negative pole of 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, the transformerless power supply operation principle of the LED for illumination of the present embodiment and mode are as following:
The LED lamp pearl group of LED lamp pearl or series connection is by being electrically connected with the LED power interface J1 of the transformerless power supply of the LED for illumination of the present embodiment.
The alternating current AC of external 220V is by the alternating current input A1 input of main circuit 1, in the time of 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, D13 in circuit, D21, D23 ... Dn1, Dn3 are inoperative, and charging equivalent electric circuit as shown in Figure 3.
Output voltage when 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 control of the output voltage on filtering energy storage capacitor Co compares to realize to output voltage V out and reference voltage Vref 1 by two voltage comparator U1: the first output 1 pin output low level of two voltage comparator U1 in the time of Vout > Vref1, simultaneously, in the time that 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, ensure 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 control of the output voltage on filtering energy storage capacitor Co compares to realize to Vout and Vref2 by two voltage comparator U1, the first output 1 pin output low level of two voltage comparator U1 in the time of 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, ensure that Vout output can not be less than Vref2.When boost charge, the constant current control of DC power supply output current realizes by Q3, in the time that the electric current flowing through on sampling resistor Rf exceedes 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, forbid the first output output LOW voltage of two voltage comparator U1, stop triode Q1 conducting, stop the boost charge to power filter energy storage capacitor Co, owing to being connected by R9 between the first negative input end of two voltage comparator U1 and reference voltage Vref 2, drag down the first negative input end of two voltage comparator U1, can not have influence on reference voltage Vref 2, while drags down the base stage of Q2 with the diode D2 that the collector electrode of Q3 joins, and makes Q2 conducting, and bypass Do2, Co, stop the boost charge to power filter energy storage capacitor Co.The authority of constant current control is higher than pressure limiting control, 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.
Can determine the resistance value of sampling resistor Rf by LED constant current controlling value I, calculating Rf according to formula (3) 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 selecting how many fraction piezoelectricity to hold can, according to the determined Vout of formula (1), calculate by formula (7):
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 example as 220V, if the LED quantity of demand motive is 4, calculating output dc voltage Vout according to formula (1) 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 (2)
1. a transformerless power supply for LED for illumination, 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 with the DC power output end (A2) of main circuit (1); The first control signal input (A3) of main circuit (1) is electrically connected with 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 with 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 with 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 with the DC power output end (A2) of main circuit (1); Described main circuit (1) be a kind of in the time of 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 ensure 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 successively; Dividing potential drop discharge circuits at different levels are by dividing potential drop electric capacity, rectification diode and 2 isolating diode compositions; 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 positive pole of the second isolating diode, the anodal conllinear of dividing potential drop electric capacity and form common junction, this common junction is the first conllinear end; The negative pole of dividing potential drop electric capacity is connected and forms common junction with the negative electricity of the first isolating diode, 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 of n fraction pressure discharge circuit, and this input is also that n-1 fraction presses the first output of discharge circuit to be electrically connected with upper level; The anodal conllinear of the negative pole of diode Dn2, the positive pole of 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 the output of the first electronic switch Q1, one end of inductance coil L1 and sustained diode o1; The plus earth of sustained diode o1; The other end, the positive pole of filtering energy storage capacitor Co and the negative pole conllinear of diode Do2 of inductance coil L1 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 with 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;
The first described electronic switch Q1 is NPN type triode, positive-negative-positive triode or the common collection that is made up of 2 positive-negative-positive triodes-collector altogether; In the time that 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; In the time that 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; In the time that the first electronic switch Q1 is the common collection-common collector being made up of 2 positive-negative-positive triodes, the base stage of the common collection-common collector of these 2 positive-negative-positive triodes compositions is the control end of the first electronic switch Q1, the emitter of the common collection-common collector of these 2 positive-negative-positive triodes compositions is the input of the first electronic switch Q1, and the collector electrode of the common collection-common collector of these 2 positive-negative-positive triodes compositions is the output of the first electronic switch Q1;
The second described electronic switch Q2 is NPN type triode, positive-negative-positive triode or the common collection that is made up of 2 positive-negative-positive triodes-collector altogether; In the time that 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; In the time that 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; In the time that the second electronic switch Q2 is the common collection-common collector being made up of 2 positive-negative-positive triodes, the base stage of the common collection-common collector of these 2 positive-negative-positive triodes compositions is the control end of the second electronic switch Q2, the emitter of the common collection-common collector of these 2 positive-negative-positive triodes compositions is the input of the second electronic switch Q2, and the collector electrode of the common collection-common collector of these 2 positive-negative-positive triodes compositions is the output of the second electronic switch Q2;
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.
2. the transformerless power supply of LED for illumination according to claim 1, 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 made up 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; The anode of three end reference voltage stabilizing source U2, the base stage of triode Q3, one end of resistance R 6 and one end of sampling resistor Rf are shared and are 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); One end of the negative electrode of three end reference voltage stabilizing source U2, one end of resistance R 2, resistance R 4 and the second in-phase input end conllinear of two voltage comparator U1; One end conllinear of the reference level of three end reference voltage stabilizing source U2, 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 resistance R 9, the other end of 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 with 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 the other end of resistance R 3, anodal and two voltage comparator U1 of diode D2; The collector electrode conllinear of the negative pole of diode D2, the negative pole of 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).
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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 |
| CN113141693A (en) * | 2020-01-17 | 2021-07-20 | 深圳市明微电子股份有限公司 | Linear constant current control circuit and light source system |
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| CN104023451B (en) | 2016-03-30 |
| CN104010425B (en) | 2016-02-03 |
| CN104039051B (en) | 2016-02-03 |
| CN104039051A (en) | 2014-09-10 |
| CN102665327B (en) | 2014-08-06 |
| CN104023451A (en) | 2014-09-03 |
| CN102665327A (en) | 2012-09-12 |
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