CN104039051B - Transformer-free light-emitting diode power supply for illumination - Google Patents
Transformer-free light-emitting diode power supply for illumination Download PDFInfo
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- 238000005286 illumination Methods 0.000 title claims description 9
- 239000003990 capacitor Substances 0.000 claims abstract description 79
- 238000005070 sampling Methods 0.000 claims abstract description 50
- 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
- 230000001502 supplementing effect Effects 0.000 abstract 1
- 239000002131 composite material Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 5
- 230000001105 regulatory effect Effects 0.000 description 5
- 239000011324 bead Substances 0.000 description 2
- 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
- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- GOLXNESZZPUPJE-UHFFFAOYSA-N spiromesifen Chemical compound CC1=CC(C)=CC(C)=C1C(C(O1)=O)=C(OC(=O)CC(C)(C)C)C11CCCC1 GOLXNESZZPUPJE-UHFFFAOYSA-N 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
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Abstract
The invention provides a light-emitting diode power supply for lighting without a transformer, 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 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 relating to a kind of transformerless D.C. regulated power supply for powering to light-emitting diode.
Background technology
At present, 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, thus volume can not be accomplished very little, 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, provides a kind of transformerless D.C. regulated power supply of powering to illuminating light-emitting diode.
Technical scheme of the present invention is: a kind of transformerless 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 with the DC power output end of main circuit; First control signal input of main circuit is electrically connected with the first control signal output of pressure-stabilizing constant flow control circuit; 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 is electrically connected with 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 derided capacitors series connection dividing potential drop and filtering energy storage capacitor Co produce direct current export, at input AC electricity negative half period time by corresponding isolating diode, the first shared electronic switch Q1 and inductance coil L1, electric discharge is supplemented to filtering energy storage capacitor Co successively by each derided capacitors and produces the circuit that direct current exports; Above-mentioned pressure-stabilizing constant flow control circuit is by carrying out sampling voltage signal and sampling current signal processing rear feedback effect in above-mentioned main circuit to ensure the direct voltage that main circuit exports and the stable circuit of direct current.
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 circuit at different levels is electrically connected successively; Dividing potential drop discharge circuit at different levels is by derided capacitors, rectification diode and 2 isolating diode compositions; Dividing potential drop discharge circuit at different levels all has input, the first conllinear end, the first output, the second output and ground; Derided capacitors 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 positive pole conllinear of derided capacitors and form common junction, this common junction is the first conllinear end; The negative pole of derided capacitors is connected with the negative electricity of the first isolating diode 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 pressure discharge circuit of main circuit is made up of the diode D12 as rectifier diode, the electrochemical capacitor C1 as derided capacitors, the diode D11 as the first isolating diode and the diode D13 as the second isolating diode; The positive pole of diode D12 had both been the input of the 1st fraction pressure discharge circuit, also be the alternating current input of main circuit, the n-th fraction pressure discharge circuit of main circuit is made up of the diode Dn2 as rectifier diode, the electrochemical capacitor Cn as derided capacitors, the diode Dn1 as the first isolating diode and the diode Dn3 as the second isolating diode; The positive pole of diode Dn2 is the input of the n-th fraction pressure discharge circuit, and this input and upper level are also that the (n-1)th fraction presses the first output of discharge circuit to be electrically connected; 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;
Second output of dividing potential drop discharge circuit at different levels is all connected to 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 of inductance coil L1, the positive pole of 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 negative pole of filtering energy storage capacitor Co and the equal ground connection of output of the second electronic switch Q2; The positive pole of diode Do2 and the input of the second electronic switch Q2 all press the first output of discharge circuit to be electrically connected with the n-th 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 inputted to the positive pole of diode D12, and Vout is the direct voltage exported at the positive pole of filtering energy storage capacitor Co, and the span of m is 1 to 6.
The first above-mentioned electronic switch Q1 is NPN type triode, PNP type triode or common collection-altogether collector of being made up of 2 PNP type triode; 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 PNP type triode, the base stage of this PNP type triode is the control end of the first electronic switch Q1, the emitter of this PNP type triode is the input of the first electronic switch Q1, and the collector electrode of this PNP type triode is the output of the first electronic switch Q1; When the first electronic switch Q1 is the common collection-common collector be made up of 2 PNP type triode, 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, PNP type triode or common collection-altogether collector of being made up of 2 PNP type triode; 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 PNP type triode, the base stage of this PNP type triode is the control end of the second electronic switch Q2, the emitter of this PNP type triode is the input of the second electronic switch Q2, and the collector electrode of this PNP type triode is the output of the second electronic switch Q2; When the second electronic switch Q2 is the common collection-common collector be made up of 2 PNP type triode, 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.
Above-mentioned pressure-stabilizing constant flow control circuit comprises twin voltage comparator U1, triode Q3, diode D1, diode D2, resistance R1, resistance R3, resistance R9, sampling resistor Rf and reference voltage circuit; Described reference voltage circuit is made up of three end reference voltage stabilizing source U2, resistance R2 and the resistance R4 connected successively, resistance R5 and resistance R6; One end of the anode of three end reference voltage stabilizing source U2, the base stage of triode Q3, one end of resistance R6 and sampling resistor Rf is shared and forms common junction, and this common junction is the sampling current input of pressure-stabilizing constant flow control circuit; The emitter of triode Q3 and the other end conllinear of sampling resistor Rf and form common junction, this common junction is the sampling current output of pressure-stabilizing constant flow control circuit; The second in-phase input end conllinear of the negative electrode of three end reference voltage stabilizing source U2, one end of resistance R2, one end of resistance R4 and twin voltage comparator U1; The reference level of three end reference voltage stabilizing source U2, the other end of resistance R6 and one end conllinear of resistance R5; One end conllinear of first inverting input of twin voltage comparator U1, the positive pole of diode D1 and resistance R9; The other end conllinear of the other end of resistance R9, the other end of resistance R4 and resistance R5; The other end conllinear of the power end of twin voltage comparator U1 and the resistance R2 of reference voltage circuit and form common junction, this common junction is the power end of pressure-stabilizing constant flow control circuit; One end of resistance R1 is the first control signal output of pressure-stabilizing constant flow control circuit; The other end of resistance R1 is electrically connected with first output of twin voltage comparator U1; One end of resistance R3 is the second control signal output of pressure-stabilizing constant flow control circuit; The second output conllinear of the other end of resistance R3, the positive pole of diode D2 and twin voltage comparator U1; The collector electrode conllinear of the negative pole of diode D2, the negative pole of diode D1 and triode Q3; First in-phase input end of twin voltage comparator U1 and the second inverting input are jointly as the sampling voltage input of pressure-stabilizing constant flow control circuit.
The derided capacitors C1 to Cn of above-mentioned dividing potential drop discharge circuits at different levels is all equal with the capacitance of filtering energy storage capacitor Co.
Good effect of the present invention is: transistor, crystal diode, comparator, voltage-stabiliser tube and the components and parts such as resistance, electric capacity that the present invention is conventional, being achieved by the design of circuit can not provide pressure-stabilizing constant flow direct current to export the power supply driving illuminating LED or the work of series LED group with transformer, owing to eliminating transformer thus making power volume reduce, weight saving, cost reduces.
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 the equivalent circuit diagram of dividing potential drop discharge circuits at different levels when alternating current positive half period in Fig. 2;
Fig. 4 is the equivalent circuit diagram of dividing potential drop discharge circuits at different levels when alternating current negative half-cycle in Fig. 2.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
See Fig. 1, transformerless LED for illumination power supply 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; 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; 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 circuit at different levels is electrically connected successively; Dividing potential drop discharge circuit at different levels is by derided capacitors, rectification diode and 2 isolating diode compositions.Dividing potential drop discharge circuit at different levels all has input, the first conllinear end, the first output, the second output and ground.Derided capacitors 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 positive pole conllinear of derided capacitors and form common junction, this common junction is the first conllinear end; The negative pole of derided capacitors is connected with the negative electricity of the first isolating diode 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 circuit at different levels forms the earth terminal of main circuit 1 jointly.Wherein, the 1st fraction pressure discharge circuit of main circuit 1 is made up of the diode D12 as rectifier diode, the electrochemical capacitor C1 as derided capacitors, the diode D11 as the first isolating diode and the diode D13 as the second isolating diode.The positive pole of diode D12 had both been the input of the 1st fraction pressure discharge circuit, was also the alternating current input A1 of main circuit 1.2nd fraction pressure discharge circuit of main circuit 1 is made up of the electrochemical capacitor C2 as derided capacitors, the diode D22 as rectifier diode, the diode D21 as the first isolating diode and the diode D23 as the second isolating diode.The input of just very the 2nd fraction pressure discharge circuit of diode D22, this input and the 1st fraction press the first output of discharge circuit to be electrically connected.N-th fraction pressure discharge circuit of main circuit 1 is made up of the diode Dn2 as rectifier diode, the electrochemical capacitor Cn as derided capacitors, the diode Dn1 as the first isolating diode and the diode Dn3 as the second isolating diode.The input of the just very n-th fraction pressure discharge circuit of diode Dn2, this input and upper level are also that the (n-1)th fraction presses the first output of discharge circuit to be electrically connected.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.
Second output of dividing potential drop discharge circuit at different levels is all connected to 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 of inductance coil L1, the positive pole of 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 negative pole of filtering energy storage capacitor Co and the equal ground connection of output of the second electronic switch Q2; The positive pole of diode Do2 and the input of the second electronic switch Q2 all press the first output of discharge circuit to be electrically connected with the n-th 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 first electronic switch Q1 can be NPN type triode, PNP type triode or common collection-altogether collector of being made up of 2 PNP type triode; The common collection that the present embodiment is preferably made up of 2 PNP type triode-collector 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 PNP type triode, the base stage of this PNP type triode is the control end of the first electronic switch Q1, the emitter of this PNP type triode is the input of the first electronic switch Q1, and the collector electrode of this PNP type triode is the output of the first electronic switch Q1; When the first electronic switch Q1 is the common collection-common collector be made up of 2 PNP type triode, 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, PNP type triode or common collection-altogether collector of being made up of 2 PNP type triode.The common collection that the present embodiment is preferably made up of 2 PNP type triode-collector 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 PNP type triode, the base stage of this PNP type triode is the control end of the second electronic switch Q2, the emitter of this PNP type triode is the input of the second electronic switch Q2, and the collector electrode of this PNP type triode is the output of the second electronic switch Q2; When the second electronic switch Q2 is the common collection-common collector be made up of 2 PNP type triode, 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 twin voltage comparator U1, NPN type triode Q3, diode D1, diode D2, resistance R1, resistance R3, resistance R9, sampling resistor Rf and reference voltage circuit, and reference voltage circuit is made up of three end reference voltage stabilizing source U2, resistance R2 and the resistance R4 connected successively, resistance R5 and resistance R6.
In the present embodiment, the preferred LM393 of model of twin voltage comparator U1.The preferred LM431A of model of three end reference voltage stabilizing source U2.Built-in two comparators of twin 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; Second in-phase input end is 5 pin, and the second inverting input is 6 pin, and the second output is 7 pin.
One end of the anode of three end reference voltage stabilizing source U2, the base stage of triode Q3, one end of resistance R6 and sampling resistor Rf has common junction, and this common junction is the sampling current input B6 of pressure-stabilizing constant flow control circuit 2; The emitter of triode Q3 and the other end of sampling resistor Rf have common junction, and this common junction is the sampling current output B7 of pressure-stabilizing constant flow control circuit 2; Second in-phase input end 5 pin of the negative electrode of three end reference voltage stabilizing source U2 and one end of resistance R2, one end of resistance R4 and twin voltage comparator U1 has common junction; The reference level of three end reference voltage stabilizing source U2, the other end of resistance R6 and one end conllinear of resistance R5; First inverting input 2 pin of twin voltage comparator U1, the positive pole of diode D1 and one end conllinear of resistance R9; The other end conllinear of the other end of resistance R9, the other end of resistance R4 and resistance R5; The power end of twin voltage comparator U1 is also that VCC holds the other end of the resistance R2 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 R1 is the first control signal output B3 of pressure-stabilizing constant flow control circuit 2; The other end of resistance R1 is electrically connected with first output 1 pin of twin voltage comparator U1; One end of resistance R3 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 R3, the positive pole of diode D2 and twin voltage comparator U1; The collector electrode conllinear of the negative pole of diode D2, the negative pole of diode D1 and triode Q3; First in-phase input end 3 pin of twin 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 twin voltage comparator U1 holds 4 pin ground connection.
In the present embodiment, aforesaid derided capacitors C1, C2 ... Cn and filtering energy storage capacitor Co is electrochemical capacitor, and capacitance is all equal.
See Fig. 2, referring to Fig. 3 and Fig. 4, the transformerless LED for illumination power work principle of the present embodiment and mode are as following:
The LED lamp bead group of LED lamp bead or series connection is electrically connected by the LED power interface J1 of the transformerless LED for illumination power supply with the present embodiment.
The alternating current AC of external 220V is inputted 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 charges, at charge cycle, 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 for LED and provides sampling voltage for pressure-stabilizing constant flow control circuit 2, the limited-voltage control of the output voltage on filtering energy storage capacitor Co to be compared output voltage Vout and reference voltage Vref 1 by twin voltage comparator U1 and realizes: the first output 1 pin output low level of twin voltage comparator U1 as Vout>Vref1, simultaneously, when charging current is greater than setting electric current, pressure drop on sampling resistor Rf increases also i.e. transistor base voltage rising makes triode Q3 conducting, both cause triode Q2 conducting, and bypass diode Do2 and electric capacity Co after triode Q2 conducting, thus stop the charging to electric capacity Co, ensure that output voltage Vout can not be greater than Vref1 and output current can not be greater than setting electric current.
When the alternating current AC of 220V is at negative half-cycle, circuit stops the charging to each electric capacity, and enter the current drain cycle, in the current drain cycle, according to circuit theory, derided capacitors 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 for LED and provides sampling voltage for pressure-stabilizing constant flow control circuit, the limited-voltage control of the output voltage on filtering energy storage capacitor Co to be compared Vout and Vref2 by twin voltage comparator U1 and realizes, the first output 1 pin output low level of twin voltage comparator U1 as Vout<Vref2, make Q1 conducting, connecting derided capacitors C1 ~ Cn makes its parallel connection carry out boost charge to Co, derided capacitors C1 from its positive pole through D13, Q1, L1, Co, the negative pole of D11 to electric capacity C1 forms a discharge loop to Co supplemental current, other derided capacitors C2-Cn operation principle is identical with C1, to guarantee Vout output voltage stabilization or constant output current, ensure that Vout exports and can not be less than Vref2.During boost charge, the current constant control of DC power supply output current is realized by Q3, when the electric current that sampling resistor Rf flows through exceedes setting electric current, its voltage drop reaches 0.7V, Q3 conducting, first negative input end of twin voltage comparator U1 drags down by the diode D1 connected with the collector electrode of Q3, forbid the first output output LOW voltage of twin voltage comparator U1, stop triode Q1 conducting, stop the boost charge to power filter energy storage capacitor Co, because first negative input end of twin voltage comparator U1 is connected by R9 with between reference voltage Vref 2, drag down first negative input end of twin voltage comparator U1, reference voltage Vref 2 can not be had influence on, the base stage of Q2 drags down by the diode D2 simultaneously connected with the collector electrode of Q3, makes Q2 conducting, bypass Do2, Co, stops the boost charge to power filter energy storage capacitor Co.The authority of current constant control is higher than limited-voltage control, and when Q3 conducting, limited-voltage control is 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 output voltage values Vout and the current value I of illuminating LED power supply is determined:
Vout=LEDs*3.5（1）
I=0.3A（2）
Vout is DC power output voltage value, and LEDs is the quantity needing to drive how many illuminating LEDs, and the forward voltage drop of 1 watt of illuminating LED is generally 3.5V, and electric current I is 300mA.
Can be determined 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 determination 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, and R5 can calculate according to formula (4).Vref1, Vref2 magnitude of voltage is 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 derided capacitors stage number selection, selects how many grades of derided capacitors according to formula (1) determined Vout, can be calculated by formula (7):
n=(Vac–Vout)/(m
*Vout
)（7）
The span of Coefficient m is wherein 1 to 6.Rule of thumb, select derided capacitors C1, C2 ... the capacitance of Cn and filtering energy storage capacitor Co is all equal, between the range of choice of derided capacitors voltage the best is 1.5 to 3 times of output voltage Vout, direct current constant current and the pressure limiting that can obtain better performances export, also namely the optimum valuing range of m is between 1.5 to 3, thus can determine the number n of derided capacitors.Take input ac voltage as 220V be example, if need the LED quantity driven to be 4, then calculating output dc voltage Vout according to formula (1) is 14V, if m gets 1, then can calculate n is 15; If m gets 6, then can calculate n is 2; Between the optimum valuing range 1.5 to 3 of m, determine that m gets 2, then can calculate n is 7, that is, selects 7 derided capacitors in main circuit 1, by the circuit of the present embodiment, can drive the present embodiment 4 LED, 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 change and obtain corresponding equivalent technical scheme, therefore all equivalent technical schemes all should be included into scope of patent protection of the present invention.
Claims (1)
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 with the DC power output end (A2) of main circuit (1); 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); 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 when the positive half cycle of input AC electricity by some spaced rectifier diodes and derided capacitors series connection dividing potential drop and filtering energy storage capacitor Co produce direct current export, at input AC electricity negative half period time by corresponding isolating diode, the first shared electronic switch Q1 and inductance coil L1, electric discharge is supplemented to filtering energy storage capacitor Co successively by each derided capacitors and produces the circuit that direct current exports; Described pressure-stabilizing constant flow control circuit (2) is by carrying out sampling voltage signal and sampling current signal processing rear feedback effect in described main circuit (1) to ensure the direct voltage that main circuit (1) exports and the stable circuit of direct current;
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 circuit at different levels is electrically connected successively; Dividing potential drop discharge circuit at different levels is by derided capacitors, rectification diode and 2 isolating diode compositions; Dividing potential drop discharge circuit at different levels all has input, the first conllinear end, the first output, the second output and ground; Derided capacitors 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 positive pole conllinear of derided capacitors and form common junction, this common junction is the first conllinear end; The negative pole of derided capacitors is connected with the negative electricity of the first isolating diode 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 pressure discharge circuit of main circuit (1) is made up of the diode D12 as rectifier diode, the electrochemical capacitor C1 as derided capacitors, the diode D11 as the first isolating diode and the diode D13 as the second isolating diode; The positive pole of diode D12 had both been the input of the 1st fraction pressure discharge circuit, was also the alternating current input (A1) of main circuit (1); N-th fraction pressure discharge circuit of main circuit (1) is made up of the diode Dn2 as rectifier diode, the electrochemical capacitor Cn as derided capacitors, the diode Dn1 as the first isolating diode and the diode Dn3 as the second isolating diode; The positive pole of diode Dn2 is the input of the n-th fraction pressure discharge circuit, and this input and upper level are also that the (n-1)th fraction presses the first output of discharge circuit to be electrically connected; The positive pole 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);
Second output of dividing potential drop discharge circuit at different levels is all connected to 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 of inductance coil L1, the positive pole of 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 negative pole of filtering energy storage capacitor Co and the equal ground connection of output of the second electronic switch Q2; The positive pole of diode Do2 and the input of the second electronic switch Q2 all press the first output of discharge circuit to be electrically connected with the n-th 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 inputted to the positive pole of diode D12, and Vout is the direct voltage exported at the positive pole of filtering energy storage capacitor Co, and the span of m is 1 to 6;
The first described electronic switch Q1 is NPN type triode, PNP type triode or common collection-altogether collector of being made up of 2 PNP type triode; 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 PNP type triode, the base stage of this PNP type triode is the control end of the first electronic switch Q1, the emitter of this PNP type triode is the input of the first electronic switch Q1, and the collector electrode of this PNP type triode is the output of the first electronic switch Q1; When the first electronic switch Q1 is the common collection-common collector be made up of 2 PNP type triode, the base stage of the common collection-common collector of these 2 PNP type triode compositions is the control end of the first electronic switch Q1, the emitter of the common collection-common collector of these 2 PNP type triode compositions is the input of the first electronic switch Q1, and the collector electrode of the common collection-common collector of these 2 PNP type triode compositions is the output of the first electronic switch Q1;
The second described electronic switch Q2 is NPN type triode, PNP type triode or common collection-altogether collector of being made up of 2 PNP type triode; 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 PNP type triode, the base stage of this PNP type triode is the control end of the second electronic switch Q2, the emitter of this PNP type triode is the input of the second electronic switch Q2, and the collector electrode of this PNP type triode is the output of the second electronic switch Q2; When the second electronic switch Q2 is the common collection-common collector be made up of 2 PNP type triode, the base stage of the common collection-common collector of these 2 PNP type triode compositions is the control end of the second electronic switch Q2, the emitter of the common collection-common collector of these 2 PNP type triode compositions is the input of the second electronic switch Q2, and the collector electrode of the common collection-common collector of these 2 PNP type triode compositions is the output of the second electronic switch Q2;
Described pressure-stabilizing constant flow control circuit (2) comprises twin voltage comparator U1, triode Q3, diode D1, diode D2, resistance R1, resistance R3, resistance R9, sampling resistor Rf and reference voltage circuit; Described reference voltage circuit is made up of three end reference voltage stabilizing source U2, resistance R2 and the resistance R4 connected successively, resistance R5 and resistance R6; One end of the anode of three end reference voltage stabilizing source U2, the base stage of triode Q3, one end of resistance R6 and sampling resistor Rf is shared and forms common junction, and this common junction is the sampling current input (B6) of pressure-stabilizing constant flow control circuit (2); The emitter of triode Q3 and the other end conllinear of sampling resistor Rf and form common junction, this common junction is the sampling current output (B7) of pressure-stabilizing constant flow control circuit (2); The second in-phase input end conllinear of the negative electrode of three end reference voltage stabilizing source U2, one end of resistance R2, one end of resistance R4 and twin voltage comparator U1; The reference level of three end reference voltage stabilizing source U2, the other end of resistance R6 and one end conllinear of resistance R5; One end conllinear of first inverting input of twin voltage comparator U1, the positive pole of diode D1 and resistance R9; The other end conllinear of the other end of resistance R9, the other end of resistance R4 and resistance R5; The other end conllinear of the power end of twin voltage comparator U1 and the resistance R2 of reference voltage circuit and form common junction, this common junction is the power end (B5) of pressure-stabilizing constant flow control circuit (2); One end of resistance R1 is the first control signal output (B3) of pressure-stabilizing constant flow control circuit (2); The other end of resistance R1 is electrically connected with first output of twin voltage comparator U1; One end of resistance R3 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 R3, the positive pole of diode D2 and twin voltage comparator U1; The collector electrode conllinear of the negative pole of diode D2, the negative pole of diode D1 and triode Q3; First in-phase input end of twin voltage comparator U1 and the second inverting input are jointly as the sampling voltage input (B2) of pressure-stabilizing constant flow control circuit (2);
The resistance value of described sampling resistor Rf is determined by following formula:
Rf=0.7/I, in formula, I is the current value that transless LED for illumination power supply exports;
The capacitance of the electrochemical capacitor C1 to Cn as derided capacitors in described dividing potential drop discharge circuits at different levels and filtering energy storage capacitor Co is all equal.
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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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| CN102665327B (en) * | 2012-04-13 | 2014-08-06 | 江苏理工学院 | Light-emitting diode power supply for illumination without transformer |
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| CN101534064A (en) * | 2008-03-14 | 2009-09-16 | 聚积科技股份有限公司 | Power supply circuit of AC-DC converter |
| CN102665327B (en) * | 2012-04-13 | 2014-08-06 | 江苏理工学院 | Light-emitting diode power supply for illumination without transformer |
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| CN104010425B (en) | 2016-02-03 |
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| CN102665327A (en) | 2012-09-12 |
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