CN102665327A - Light-emitting diode power supply for illumination without transformer - Google Patents
Light-emitting diode power supply for illumination without transformer Download PDFInfo
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- CN102665327A CN102665327A CN2012101097255A CN201210109725A CN102665327A CN 102665327 A CN102665327 A CN 102665327A CN 2012101097255 A CN2012101097255 A CN 2012101097255A CN 201210109725 A CN201210109725 A CN 201210109725A CN 102665327 A CN102665327 A CN 102665327A
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Abstract
The invention provides a light-emitting diode power supply for illumination without a transformer. The power supply comprises a main circuit, a voltage-stabilizing constant current control circuit and an LED power interface, wherein the main circuit divides voltage through a plurality of rectifier diodes and voltage-dividing capacitors arranged at intervals and connected in series and generates DC output in a filtering energy storage capacitor when AC is input at the positive half period, and discharges supplementarily to the filtering energy storage capacitor through corresponding isolating diodes, a shared first electronic switch and a shared inductor respectively by each voltage-dividing capacitor when AC is input at the negative half period so as to generate DC output; and the voltage-stabilizing constant current control circuit processes sampling voltage signals and sampling current signals and then feeds the processed signals back to the main circuit so as to keep stable the working voltage and current of LEDs. The light-emitting diode power supply for illumination without a transformer is not provided with a transformer which is arranged on a common LED illumination power supply, so as to reduce the size, the weight and the cost of the power supply.
Description
Technical field
The present invention relates to a kind of illuminating power supply, particularly relate to a kind of transformerless D.C. regulated power supply that is used for to led powered.
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 that is used for step-down; Thereby volume can not accomplish very for a short time, seem heavy, and transformer occupies very big production cost in D.C. regulated power supply.
Summary of the invention
The objective of the invention is: overcome big, heavy, the high deficiency of cost of volume that the existing common D.C. regulated power supply that contains transformer exists, a kind of transformerless D.C. regulated power supply to illuminating led powered is provided.
Technical scheme of the present invention is: a kind of transless LED for illumination power supply, and its design feature is: comprise main circuit, pressure-stabilizing constant flow control circuit and LED power interface J1; LED power interface J1 has positive pole and negative pole; Above-mentioned main circuit is provided with alternating current input, dc power output end, first signal input end, second signal input end and pressure-stabilizing constant flow control circuit power output end; Above-mentioned pressure-stabilizing constant flow control circuit is provided with sampling voltage input, first control signal output ends, second control signal output ends, 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 signal input end of main circuit is electrically connected with first control signal output ends of pressure-stabilizing constant flow control circuit; Second signal input end of main circuit is electrically connected with second control signal output ends 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 2; The positive pole of LED power interface be electrically connected with the dc power output end of main circuit; Above-mentioned main circuit is the circuit that a kind of rectifier diode that when the positive half cycle of input AC electricity, is provided with through some intervals produces direct current output with dividing potential drop capacitances in series dividing potential drop and at filtering energy storage capacitor Co, through corresponding isolating diode, the shared first electronic switch Q1 and inductance coil L1 the additional discharge generation direct current of filtering energy storage capacitor Co 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 through sampling voltage signal and sampling current signal are handled the back feedback effect in direct voltage and the direct current stable circuit of above-mentioned main circuit to guarantee that main circuit is exported.
Further scheme is: above-mentioned main circuit comprises dividing potential drop discharge circuit, filtering energy storage capacitor Co, the first electronic switch Q1), the second electronic switch Q2, diode Do2, sustained diode o1 and inductance coil L1;
The dividing potential drop discharge circuit has the n level, and dividing potential drop discharge circuits at different levels are electrically connected successively; Dividing potential drop discharge circuits at different levels are formed by dividing potential drop electric capacity, rectification diode and 2 isolating diodes; Dividing potential drop discharge circuits at different levels all have input, the first conllinear end, first output, second output and ground; Dividing potential drop electric capacity is electrochemical capacitor; 2 isolating diodes are divided into first isolating diode and second isolating diode; The positive pole of rectification diode is input; The negative pole of rectification diode, the anodal conllinear of the positive pole of second isolating diode, dividing potential drop electric capacity and form common junction, this common junction is the first conllinear end; The negative electricity of the negative pole of dividing potential drop electric capacity and first isolating diode is connected and forms common junction, and this common junction is first output; The negative pole of second isolating diode is second output; The positive pole of first isolating diode is earth terminal; Wherein, the 1st of main circuit the grade of dividing potential drop discharge circuit is by as the diode D12 of rectifier diode, as the electrochemical capacitor C1 of dividing potential drop electric capacity, form as the diode D11 of first isolating diode with as the diode D13 of second isolating diode; The positive pole of diode D12 both had been the input of the 1st grade of dividing potential drop discharge circuit; Also be the alternating current input of main circuit, the n level dividing potential drop discharge circuit of main circuit is by as the diode Dn2 of rectifier diode, as the electrochemical capacitor Cn of dividing potential drop electric capacity, form as the diode Dn1 of first isolating diode with as the diode Dn3 of second isolating diode; The positive pole of diode Dn2 is the input of n level dividing potential drop discharge circuit, this input and upper level also promptly first output of n-1 level dividing potential drop discharge circuit be electrically connected; The positive level conllinear of the positive pole of the negative pole of diode Dn2, electrochemical capacitor Cn and diode Dn3 and form common junction, this common junction is the first conllinear end, also is the pressure-stabilizing constant flow control circuit power output end of main circuit;
Second output of dividing potential drop discharge circuits at different levels all is connected in the input of the first electronic switch Q1; The end of the output of the first electronic switch Q1, inductance coil L1 and the negative pole conllinear of sustained diode o1; The plus earth of sustained diode o1; The positive pole of the other end of inductance coil L1, filtering energy storage capacitor Co and the negative pole conllinear of diode Do2 and form common junction, this common junction is the dc power output end of main circuit; The equal ground connection of output of the negative pole of filtering energy storage capacitor Co and the second electronic switch Q2; The input of the positive pole of diode Do2 and the second electronic switch Q2 all is electrically connected with first output of n level dividing potential drop discharge circuit; The control end of the first electronic switch Q1 is first signal input end of main circuit; The control end of the second electronic switch Q2 is second signal input end of main circuit;
The progression n of the dividing potential drop discharge circuit of main circuit is according to calculating formula n=(Vac – Vout)/(m
*Vout
)Calculate, wherein Vac is the alternating voltage to the positive pole input of diode D12, and Vout is that the span of m is 1 to 6 at the direct voltage of the positive pole output of filtering energy storage capacitor Co.
Further scheme is: the first above-mentioned electronic switch Q1 is NPN type triode, positive-negative-positive triode or common collection-common collector of being made up of 2 positive-negative-positive triodes; When the first electronic switch Q1 is NPN type triode; The base stage of this NPN type triode is the control end of the first electronic switch Q1; The collector electrode of this NPN type triode is the input of the first electronic switch Q1, and the emitter of this NPN type triode is the output of the first electronic switch Q1; When the first electronic switch Q1 is the positive-negative-positive triode; The base stage of this positive-negative-positive triode is the control end of the first electronic switch Q1; The emitter of this positive-negative-positive triode is the input of the first electronic switch Q1, and the collector electrode of this positive-negative-positive triode is the output of the first electronic switch Q1; When the first electronic switch Q1 is the collector of the common collection be made up of 2 positive-negative-positive triodes-altogether; 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 described second electronic switch Q2 is the collector of NPN type triode, positive-negative-positive triode or the common collection be made up of 2 positive-negative-positive triodes-altogether; When the second electronic switch Q2 is NPN type triode; The base stage of this NPN type triode is the control end of the second electronic switch Q2; The collector electrode of this NPN type triode is the input of the second electronic switch Q2, and the emitter of this NPN type triode is the output of the second electronic switch Q2; When the second electronic switch Q2 is the positive-negative-positive triode; The base stage of this positive-negative-positive triode is the control end of the second electronic switch Q2; The emitter of this positive-negative-positive triode is the input of the second electronic switch Q2, and the collector electrode of this positive-negative-positive triode is the output of the second electronic switch Q2; When the second electronic switch Q2 is the collector of the common collection be made up of 2 positive-negative-positive triodes-altogether; The base stage of this composite pipe circuit is the control end of the second electronic switch Q2; The emitter of this composite pipe circuit is the input of the second electronic switch Q2, and the collector electrode of this composite pipe circuit is the output of the second electronic switch Q2.
Further scheme is: above-mentioned pressure-stabilizing constant flow control circuit comprises two voltage comparator U1, triode Q3, diode D1, diode D2, resistance R 1, resistance R 3, resistance R 9, sampling resistor Rf and reference voltage circuit; Said reference voltage circuit is made up of resistance R 4, resistance R 5 and the resistance R 6 of the accurate source of stable pressure U2 of three end groups, resistance R 2 and series connection successively; One end of the anode of the accurate source of stable pressure U2 of three end groups, the base stage of triode Q3, resistance R 6 and the 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 the accurate source of stable pressure U2 of three end groups, an 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 the accurate source of stable pressure U2 of three end groups, the other end of resistance R 6 and resistance R 5; One end conllinear of first inverting input of two voltage comparator U1, the positive pole of diode D1 and resistance R 9; The other end conllinear of the other end of the other end of resistance R 9, resistance R 4 and resistance R 5; The other end conllinear of the power end of two voltage comparator U1 and the resistance R of reference voltage circuit 2 and form common junction, this common junction is the power end of pressure-stabilizing constant flow control circuit; One end of resistance R 1 is first control signal output ends of pressure-stabilizing constant flow control circuit; The other end of resistance R 1 is electrically connected with first output of two voltage comparator U1; One end of resistance R 3 is second control signal output ends of pressure-stabilizing constant flow control circuit; The second output conllinear of anodal and two voltage comparator U1 of the other end of resistance R 3, diode D2; The collector electrode conllinear of the negative pole of the negative pole of diode D2, diode D1 and triode Q3; First in-phase input end of two voltage comparator U1 and second inverting input are jointly as the sampling voltage input of pressure-stabilizing constant flow control circuit.
Further scheme is: the dividing potential drop capacitor C 1 to Cn of above-mentioned dividing potential drop discharge circuits at different levels and the capacitance of filtering energy storage capacitor Co all equate.
Good effect of the present invention is: the present invention is with components and parts such as conventional transistor, crystal diode, comparator, voltage-stabiliser tube and resistance, electric capacity; Design through circuit has realized can not providing the output of pressure-stabilizing constant flow direct current to drive the power supply of illuminating LED or the work of series LED group with transformer; Thereby power volume is reduced owing to omitted transformer; Weight saving, cost reduces.
Description of 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 the equivalent circuit diagram of dividing potential drop discharge circuits at different levels when the alternating current positive half period among Fig. 2;
Fig. 4 is the equivalent circuit diagram of dividing potential drop discharge circuits at different levels when the alternating current negative half-cycle among Fig. 2.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation.
See Fig. 1, transless 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 signal input end A3, the second signal input end 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 ends B3, the second control signal output ends 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 signal input end A3 of main circuit 1 is electrically connected with the first control signal output ends B3 of pressure-stabilizing constant flow control circuit 2; The second signal input end A4 of main circuit 1 is electrically connected with the second control signal output ends 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;
The dividing potential drop discharge circuit has the n level, and dividing potential drop discharge circuits at different levels are electrically connected successively; Dividing potential drop discharge circuits at different levels are formed by dividing potential drop electric capacity, rectification diode and 2 isolating diodes.Dividing potential drop discharge circuits at different levels all have input, the first conllinear end, first output, second output and ground.Dividing potential drop electric capacity is electrochemical capacitor; 2 isolating diodes are divided into first isolating diode and second isolating diode.The positive pole of rectification diode is input; The negative pole of rectification diode, the anodal conllinear of the positive pole of second isolating diode, dividing potential drop electric capacity and form common junction, this common junction is the first conllinear end; The negative electricity of the negative pole of dividing potential drop electric capacity and first isolating diode is connected and forms common junction, and this common junction is first output; The negative pole of second isolating diode is second output; The positive pole of first isolating diode is earth terminal.The earth terminal of dividing potential drop discharge circuits at different levels is formed the earth terminal of main circuit 1 jointly.Wherein, the 1st of main circuit 1 the grade of dividing potential drop discharge circuit is by as the diode D12 of rectifier diode, as the electrochemical capacitor C1 of dividing potential drop electric capacity, form as the diode D11 of first isolating diode with as the diode D13 of second isolating diode.The positive pole of diode D12 both had been the input of the 1st grade of dividing potential drop discharge circuit, also was the alternating current input A1 of main circuit 1.The 2nd grade of dividing potential drop discharge circuit of main circuit 1 is by as the electrochemical capacitor C2 of dividing potential drop electric capacity, as the diode D22 of rectifier diode, form as the diode D21 of first isolating diode with as the diode D23 of second isolating diode.The just very input of the 2nd grade of dividing potential drop discharge circuit of diode D22, this input is electrically connected with first output of the 1st grade of dividing potential drop discharge circuit.The n level dividing potential drop discharge circuit of main circuit 1 is by as the diode Dn2 of rectifier diode, as the electrochemical capacitor Cn of dividing potential drop electric capacity, form as the diode Dn1 of first isolating diode with as the diode Dn3 of second isolating diode.The input of the just very n level dividing potential drop discharge circuit of diode Dn2, this input and upper level also promptly first output of n-1 level dividing potential drop discharge circuit be electrically connected.The positive level conllinear of the positive pole of the negative pole of diode Dn2, electrochemical capacitor Cn and diode Dn3 and form this common junction of common junction and be the first conllinear end also is the controlling circuit of voltage regulation power output end A5 of main circuit 1.
Second output of dividing potential drop discharge circuits at different levels all is connected in the input of the first electronic switch Q1; The end of the output of the first electronic switch Q1, inductance coil L1 and the negative pole conllinear of sustained diode o1; The plus earth of sustained diode o1; The positive pole of the other end of inductance coil L1, filtering energy storage capacitor Co and the negative pole conllinear of diode Do2 and form common junction, this common junction is the dc power output end A2 of main circuit 1; The equal ground connection of output of the negative pole of filtering energy storage capacitor Co and the second electronic switch Q2; The input of the positive pole of diode Do2 and the second electronic switch Q2 all is electrically connected with first output of n level dividing potential drop discharge circuit; The control end of the first electronic switch Q1 is the first signal input end A3 of main circuit 1; The control end of the second electronic switch Q2 is the second signal input end A4 of main circuit 1.
The aforesaid first electronic switch Q1 can be the collector of NPN type triode, positive-negative-positive triode or the common collection be made up of 2 positive-negative-positive triodes-altogether; The common collection that present embodiment preferably is made up of 2 positive-negative-positive triodes-common collector.When the first electronic switch Q1 is NPN type triode; The base stage of this NPN type triode is the control end of the first electronic switch Q1; The collector electrode of this NPN type triode is the input of the first electronic switch Q1, and the emitter of this NPN type triode is the output of the first electronic switch Q1; When the first electronic switch Q1 is the positive-negative-positive triode; The base stage of this positive-negative-positive triode is the control end of the first electronic switch Q1; The emitter of this positive-negative-positive triode is the input of the first electronic switch Q1, and the collector electrode of this positive-negative-positive triode is the output of the first electronic switch Q1; When the first electronic switch Q1 is the collector of the common collection be made up of 2 positive-negative-positive triodes-altogether; 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 described second electronic switch Q2 can be the collector of NPN type triode, positive-negative-positive triode or the common collection be made up of 2 positive-negative-positive triodes-altogether.The common collection that present embodiment preferably is made up of 2 positive-negative-positive triodes-common collector.When the second electronic switch Q2 is NPN type triode; The base stage of this NPN type triode is the control end of the second electronic switch Q2; The collector electrode of this NPN type triode is the input of the second electronic switch Q2, and the emitter of this NPN type triode is the output of the second electronic switch Q2; When the second electronic switch Q2 is the positive-negative-positive triode; The base stage of this positive-negative-positive triode is the control end of the second electronic switch Q2; The emitter of this positive-negative-positive triode is the input of the second electronic switch Q2, and the collector electrode of this positive-negative-positive triode is the output of the second electronic switch Q2; When the second electronic switch Q2 is the collector of the common collection be made up of 2 positive-negative-positive triodes-altogether; 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 the accurate source of stable pressure U2 of three end groups, 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 the accurate source of stable pressure U2 of three end groups.Built-in two comparators of two voltage comparator U1 of LM393 have 1 to 8 pin, and its VCC end is 8 pin, and the VSS end is 4 pin, and first in-phase input end is 3 pin, and first inverting input is 2 pin, and first output is 1 pin; Second in-phase input end is 5 pin, and second inverting input is 6 pin, and second output is 7 pin.
One end of the anode of the accurate source of stable pressure U2 of three end groups, the base stage of triode Q3, resistance R 6 and the 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; Second in-phase input end, 5 pin of one end of the negative electrode of the accurate source of stable pressure U2 of three end groups and an end of resistance R 2, resistance R 4 and two voltage comparator U1 have common junction; One end conllinear of the reference level of the accurate source of stable pressure U2 of three end groups, the other end of resistance R 6 and resistance R 5; First inverting input, 2 pin of two voltage comparator U1, the positive pole of diode D1 and an end conllinear of resistance R 9; The other end conllinear of the other end of the other end of resistance R 9, resistance R 4 and resistance R 5; The power end of two voltage comparator U1 also is 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 ends B3 of pressure-stabilizing constant flow control circuit 2; The other end of resistance R 1 is electrically connected with first output, 1 pin of two voltage comparator U1; One end of resistance R 3 is the second control signal output ends B4 of pressure-stabilizing constant flow control circuit 2; Second output, the 7 pin conllinear of anodal and two voltage comparator U1 of the other end of resistance R 3, diode D2; The collector electrode conllinear of the negative pole of the negative pole of diode D2, diode D1 and triode Q3; First in-phase input end, 3 pin of two voltage comparator U1 and second inverting input, 6 pin are the sampling voltage input B2 of pressure-stabilizing constant flow control circuit 2 jointly.The VSS of two voltage comparator U1 holds 4 pin ground connection.
In the present embodiment, aforesaid dividing potential drop capacitor C 1, C2 ... Cn and filtering energy storage capacitor Co are electrochemical capacitor, and capacitance all equates.
See Fig. 2, referring to Fig. 3 and Fig. 4, this operation principle of transformerless DC voltage-stabilized power supply of present embodiment and mode such as following:
The LED lamp pearl of LED lamp pearl or series connection group is through being electrically connected with the LED power interface J1 of the transformerless DC voltage-stabilized power supply of present embodiment.
The alternating current AC of external 220V is through the alternating current input A1 input of main circuit 1; When the positive half period of alternating current AC; Electric current through D12, C1, D22, C2 ... Dn2, Cn, Do2, Co to C1, C2 ... Cn-1, Cn, Co electric capacity charge, and at charge cycle, can know according to circuit theory; D11 in the circuit, D13, D21, D23 ... Dn1, Dn3 are inoperative, and the charging equivalent electric circuit is as shown in Figure 3.
Output voltage during charging on the filtering energy storage capacitor Co is that LED provides operating voltage and for pressure-stabilizing constant flow control circuit 2 sampling voltage is provided; The pressure limiting of the output voltage on filtering energy storage capacitor Co control compares output voltage V out and reference voltage Vref 1 through two voltage comparator U1 and realizes: as Vout>first output, the 1 pin output low level of couple voltage comparator U1 during Vref1; Simultaneously; When charging current when setting electric current; It also is that transistor base voltage raises and makes triode Q3 conducting that pressure drop on the sampling resistor Rf increases, and the both causes triode Q2 conducting, and bypass diode Do2 and capacitor C o after the triode Q2 conducting; Thereby stop charging, guarantee that output voltage V out can or not be greater than the setting electric current with output current greater than Vref1 capacitor C o.
As the alternating current AC of 220V during at negative half-cycle, circuit stops the charging to each electric capacity, gets into 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 is as shown in Figure 4.Output voltage on the filtering energy storage capacitor Co is that LED provides operating voltage and sampling voltage is provided for the pressure-stabilizing constant flow control circuit; The pressure limiting of the output voltage on filtering energy storage capacitor Co control compares Vout and Vref2 through two voltage comparator U1 and realizes; When Vout < first output, the 1 pin output low level of two voltage comparator U1 during Vref2; Make the Q1 conducting; Connect dividing potential drop capacitor C 1 ~ Cn and make its parallel connection carry out boost charge to Co, dividing potential drop capacitor C 1 forms a discharge loop to Co supplemental current through D13, Q1, L1, Co, D11 to the negative pole of capacitor C 1 from its positive pole, and other dividing potential drop capacitor C 2-Cn operation principle is identical with C1; Constant to guarantee Vout output voltage stabilization or output current, guarantee that Vout output can be less than Vref2.The constant current of DC power supply output current control realizes through Q3 during boost charge, and when the electric current that flows through on the sampling resistor Rf surpassed the setting electric current, its voltage drop reached 0.7V; The Q3 conducting; The diode D1 that joins with the collector electrode of Q3 drags down first negative input end of two voltage comparator U1, forbids the first output output LOW voltage of two voltage comparator U1, stops triode Q1 conducting; Stop boost charge to power filter energy storage capacitor Co; Owing to be connected through R9 between first negative input end of two voltage comparator U1 and the reference voltage Vref 2, drag down first negative input end of couple voltage comparator U1, can not have influence on reference voltage Vref 2; The diode D2 that joins with the collector electrode of Q3 simultaneously drags down the base stage of Q2, makes the 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, confirm the transless illuminating LED power supply related parameter choosing of the embodiment of the invention as shown in Figure 2:
At first confirm the 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 the DC power supply output voltage values, and LEDs is for needing to drive the quantity of what illuminating LEDs, and the forward voltage drop of 1 watt of illuminating LED is generally 3.5V, and electric current I is 300mA.
Can confirm the resistance value of sampling resistor Rf through 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 the accurate source of stable pressure U2 of three end groups, selects R4, R5, R6 resistance to confirm reference voltage Vref 1, Vref2 magnitude of voltage.R6 generally may be selected to be 2.5K ohm in the application, and R4 confirms VD
VOut permissible error difference generally may be selected to be 200 ohm in the application, R5 can calculate according to formula (4).Vref1, Vref2 magnitude of voltage are confirmed 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 also is that dividing potential drop electric capacity progression is selected, and selects what grade dividing potential drop electric capacity to calculate through formula (7) according to the determined Vout of formula (1):
n?=?(?Vac?–?Vout?)?/?(m
*?Vout
?)（7）
The span of Coefficient m wherein is 1 to 6.Rule of thumb; Select dividing potential drop capacitor C 1, C2 ... The appearance value of Cn and filtering energy storage capacitor Co all equates; The best range of choice of dividing potential drop capacitance voltage is between 1.5 to 3 times of output voltage V out; Can obtain the direct current constant current and the pressure limiting output of better performances, the optimum valuing range that also is m is between 1.5 to 3, thereby can confirm the number n of dividing potential drop electric capacity.With the input ac voltage is that 220V is an example, and the LED quantity that drives if desired is 4, and 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; Confirm that between the optimum valuing range 1.5 to 3 of m m gets 2, then can calculate n is 7, that is to say, selects 7 dividing potential drop electric capacity in the main circuit 1 for use, through the circuit of present embodiment, can drive 4 LED of present embodiment, and operating current voltage is the most stable.
Above embodiment is the explanation of specific embodiments of the invention; But not limitation of the present invention; The technical staff in relevant technologies field is under the situation that does not break away from the spirit and scope of the present invention; Can also make various conversion and variation and obtain the corresponding technical scheme that is equal to, so all technical schemes that are equal to all should be included into scope of patent protection of the present invention.
Claims (5)
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), first signal input end (A3), second signal input end (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), first control signal output ends (B3), second control signal output ends (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 signal input end (A3) of main circuit (1) is electrically connected with first control signal output ends (B3) of pressure-stabilizing constant flow control circuit (2); Second signal input end (A4) of main circuit (1) is electrically connected with second control signal output ends (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) is the circuit that a kind of rectifier diode that when the positive half cycle of input AC electricity, is provided with through some intervals produces direct current output with dividing potential drop capacitances in series dividing potential drop and at filtering energy storage capacitor (Co), through corresponding isolating diode, shared first electronic switch (Q1) and inductance coil (L1) the additional discharge generation direct current of filtering energy storage capacitor (Co) exported successively by each dividing potential drop electric capacity during at input AC electricity negative half period; Said pressure-stabilizing constant flow control circuit (2) is through sampling voltage signal and sampling current signal are handled the back feedback effect in direct voltage and the direct current stable circuit of said main circuit (1) to guarantee that main circuit (1) is exported.
2. transless LED for illumination power supply according to claim 1 is characterized in that: described main circuit (1) comprises dividing potential drop discharge circuit, filtering energy storage capacitor (Co), first electronic switch (Q1), second electronic switch (Q2), diode (Do2), fly-wheel diode (Do1) and inductance coil (L1);
The dividing potential drop discharge circuit has the n level, and dividing potential drop discharge circuits at different levels are electrically connected successively; Dividing potential drop discharge circuits at different levels are formed by dividing potential drop electric capacity, rectification diode and 2 isolating diodes; Dividing potential drop discharge circuits at different levels all have input, the first conllinear end, first output, second output and ground; Dividing potential drop electric capacity is electrochemical capacitor; 2 isolating diodes are divided into first isolating diode and second isolating diode; The positive pole of rectification diode is input; The negative pole of rectification diode, the anodal conllinear of the positive pole of second isolating diode, dividing potential drop electric capacity and form common junction, this common junction is the first conllinear end; The negative electricity of the negative pole of dividing potential drop electric capacity and first isolating diode is connected and forms common junction, and this common junction is first output; The negative pole of second isolating diode is second output; The positive pole of first isolating diode is earth terminal; Wherein, the 1st of main circuit (1) the grade of dividing potential drop discharge circuit is by as the diode (D12) of rectifier diode, as the electrochemical capacitor C1 of dividing potential drop electric capacity, form as the diode (D11) of first isolating diode with as the diode (D13) of second isolating diode; The positive pole of diode (D12) both had been the input of the 1st grade of dividing potential drop discharge circuit, also was the alternating current input (A1) of main circuit (1); The n level dividing potential drop discharge circuit of main circuit (1) is by as the diode (Dn2) of rectifier diode, as the electrochemical capacitor Cn of dividing potential drop electric capacity, form as the diode (Dn1) of first isolating diode with as the diode (Dn3) of second isolating diode; The positive pole of diode (Dn2) is the input of n level dividing potential drop discharge circuit, this input and upper level also promptly first output of n-1 level dividing potential drop discharge circuit be electrically connected; The positive level conllinear of the positive pole of the negative pole of diode (Dn2), electrochemical capacitor (Cn) and diode (Dn3) and form common junction, this common junction is the first conllinear end, also is the pressure-stabilizing constant flow control circuit power output end (A5) of main circuit (1);
Second output of dividing potential drop discharge circuits at different levels all is connected in the input of first electronic switch (Q1); The negative pole conllinear of one end of the output of first electronic switch (Q1), inductance coil (L1) and fly-wheel diode (Do1); The plus earth of fly-wheel diode (Do1); The negative pole conllinear of the positive pole of the other end of inductance coil (L1), filtering energy storage capacitor (Co) and diode (Do2) and form common junction, this common junction is the dc power output end (A2) of main circuit (1); The equal ground connection of output of the negative pole of filtering energy storage capacitor (Co) and second electronic switch (Q2); The input of the positive pole of diode (Do2) and second electronic switch (Q2) all is electrically connected with first output of n level dividing potential drop discharge circuit; The control end of first electronic switch (Q1) is first signal input end (A3) of main circuit (1); The control end of second electronic switch (Q2) is second signal input end (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).
3. transless LED for illumination power supply according to claim 2 is characterized in that: described first electronic switch (Q1) is the collector of NPN type triode, positive-negative-positive triode or the common collection be made up of 2 positive-negative-positive triodes-altogether; When first electronic switch (Q1) is NPN type triode; The base stage of this NPN type triode is the control end of first electronic switch (Q1); The collector electrode of this NPN type triode is the input of first electronic switch (Q1), and the emitter of this NPN type triode is the output of first electronic switch (Q1); When first electronic switch (Q1) is the positive-negative-positive triode; The base stage of this positive-negative-positive triode is the control end of first electronic switch (Q1); The emitter of this positive-negative-positive triode is the input of first electronic switch (Q1), and the collector electrode of this positive-negative-positive triode is the output of first electronic switch (Q1); When first electronic switch (Q1) is the collector of the common collection be made up of 2 positive-negative-positive triodes-altogether; The base stage of this composite pipe circuit is the control end of first electronic switch (Q1); The emitter of this composite pipe circuit is the input of first electronic switch (Q1), and the collector electrode of this composite pipe circuit is the output of first electronic switch (Q1);
Described second electronic switch (Q2) is the collector of NPN type triode, positive-negative-positive triode or the common collection be made up of 2 positive-negative-positive triodes-altogether; When second electronic switch (Q2) is NPN type triode; The base stage of this NPN type triode is the control end of second electronic switch (Q2); The collector electrode of this NPN type triode is the input of second electronic switch (Q2), and the emitter of this NPN type triode is the output of second electronic switch (Q2); When second electronic switch (Q2) is the positive-negative-positive triode; The base stage of this positive-negative-positive triode is the control end of second electronic switch (Q2); The emitter of this positive-negative-positive triode is the input of second electronic switch (Q2), and the collector electrode of this positive-negative-positive triode is the output of second electronic switch (Q2); When second electronic switch (Q2) is the collector of the common collection be made up of 2 positive-negative-positive triodes-altogether; The base stage of this composite pipe circuit is the control end of second electronic switch (Q2); The emitter of this composite pipe circuit is the input of second electronic switch (Q2), and the collector electrode of this composite pipe circuit is the output of second electronic switch (Q2).
4. transless LED for illumination power supply according to claim 3 is characterized in that: described pressure-stabilizing constant flow control circuit (2) comprises two voltage comparators (U1), triode (Q3), diode (D1), diode (D2), resistance (R1), resistance (R3), resistance (R9), sampling resistor (Rf) and reference voltage circuit; Said reference voltage circuit is made up of resistance (R4), resistance (R5) and the resistance (R6) of the accurate source of stable pressure of three end groups (U2), resistance (R2) and series connection successively; One end of one end of the base stage of the anode of the accurate source of stable pressure of three end groups (U2), triode (Q3), resistance (R6) and sampling resistor (Rf) is shared and is 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); The second in-phase input end conllinear of one end of one end of the negative electrode of the accurate source of stable pressure of three end groups (U2), resistance (R2), resistance (R4) and two voltage comparator (U1); One end conllinear of the other end of the reference level of the accurate source of stable pressure of three end groups (U2), resistance (R6) and resistance (R5); One end conllinear of the positive pole of first inverting input of two voltage comparators (U1), diode (D1) and resistance (R9); The other end conllinear of the other end of the other end of resistance (R9), resistance (R4) and resistance (R5); The other end conllinear of the resistance (R2) of the power end of two voltage comparators (U1) and 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 first control signal output ends (B3) of pressure-stabilizing constant flow control circuit (2); The other end of resistance (R1) is electrically connected with first output of two voltage comparators (U1); One end of resistance (R3) is second control signal output ends (B4) of pressure-stabilizing constant flow control circuit (2); The second output conllinear of anodal and two voltage comparators (U1) of the other end of resistance (R3), diode (D2); The collector electrode conllinear of the negative pole of the negative pole of diode (D2), diode (D1) and triode (Q3); First in-phase input end of two voltage comparators (U1) and second inverting input are jointly as the sampling voltage input (B2) of pressure-stabilizing constant flow control circuit (2).
5. according to claim 2,3 or 4 described transless LED for illumination power supplys, it is characterized in that: the capacitance of the dividing potential drop electric capacity (C1 to Cn) of described dividing potential drop discharge circuits at different levels and filtering energy storage capacitor (Co) all equates.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410276190.XA CN104039051B (en) | 2012-04-13 | 2012-04-13 | Transformer-free light-emitting diode power supply for illumination |
| CN201410275974.0A CN104023451B (en) | 2012-04-13 | 2012-04-13 | Transformer-free power supply for light emitting diode for illumination |
| CN201410277860.XA CN104010425B (en) | 2012-04-13 | 2012-04-13 | Transformer-free power supply of light-emitting diode for illumination |
| CN201210109725.5A CN102665327B (en) | 2012-04-13 | 2012-04-13 | Light-emitting diode power supply for illumination without transformer |
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| CN201210109725.5A CN102665327B (en) | 2012-04-13 | 2012-04-13 | Light-emitting diode power supply for illumination without transformer |
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| CN201410276190.XA Division CN104039051B (en) | 2012-04-13 | 2012-04-13 | Transformer-free light-emitting diode power supply for illumination |
| CN201410277860.XA Division CN104010425B (en) | 2012-04-13 | 2012-04-13 | Transformer-free power supply of light-emitting diode for illumination |
| CN201410275974.0A Division CN104023451B (en) | 2012-04-13 | 2012-04-13 | Transformer-free power supply for light emitting diode for illumination |
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| CN201210109725.5A Active CN102665327B (en) | 2012-04-13 | 2012-04-13 | Light-emitting diode power supply for illumination without transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103687173A (en) * | 2012-09-17 | 2014-03-26 | 朗捷科技股份有限公司 | Universal linear LED drive circuit capable of de-flashing |
| CN104219842A (en) * | 2014-08-29 | 2014-12-17 | 深圳市奋勇光电有限公司 | LED constant-current unit |
| 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 |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104010425B (en) * | 2012-04-13 | 2016-02-03 | 江苏理工学院 | Transformer-free power supply of light-emitting diode for illumination |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN102665327B (en) | 2014-08-06 |
| CN104039051B (en) | 2016-02-03 |
| CN104023451A (en) | 2014-09-03 |
| CN104039051A (en) | 2014-09-10 |
| CN104023451B (en) | 2016-03-30 |
| CN104010425B (en) | 2016-02-03 |
| CN104010425A (en) | 2014-08-27 |
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