CN102647835A - Dimming circuit of narrow voltage light emitting diode (LED) lamp - Google Patents
Dimming circuit of narrow voltage light emitting diode (LED) lamp Download PDFInfo
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- CN102647835A CN102647835A CN2012101404450A CN201210140445A CN102647835A CN 102647835 A CN102647835 A CN 102647835A CN 2012101404450 A CN2012101404450 A CN 2012101404450A CN 201210140445 A CN201210140445 A CN 201210140445A CN 102647835 A CN102647835 A CN 102647835A
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Abstract
The invention discloses a dimming circuit of a narrow voltage light emitting diode (LED) lamp, which has a simple structure, few components, a wide power adaption range and a good dimming effect and can achieve synchronous stepless continuous dimming of the LED lamp in a wide range. The dimming circuit of the narrow voltage LED lamp comprises a rectifying circuit (1), a multi-resonant vibration circuit (8), a pulse width modulation circuit (7), a voltage stabilizing circuit (6) and an output switch circuit (9), wherein the rectifying circuit (1) is used for transforming alternating current of a power supply to direct current and for providing driving voltage for a narrow voltage LED lamp circuit (10); the multi-resonant vibration circuit (8) is used for generating periodic pulse signals; the pulse width modulation circuit (7) is used for modulating pulse widths of output pulse signals of the multi-resonant vibration circuit (8); the voltage stabilizing circuit (6) is used for providing stable direct current voltage for the multi-resonant vibration circuit (8) and the pulse width modulation circuit (7); the output switch circuit (9) is used for responding to output pulse signals of the multi-resonant vibration circuit (8) and for providing periodic pulse output for the narrow voltage LED lamp circuit (10); the multi-resonant vibration circuit (8) comprises an astable multivibrator; and an output end of the dimming circuit is connected with the narrow voltage LED lamp circuit (10). The dimming circuit of the narrow voltage LED lamp can be applied to the field of dimming circuits of LED lamps.
Description
Technical field
The present invention relates to a kind of light adjusting circuit, relate in particular to a kind of light adjusting circuit of narrow voltage LED lamp.
Background technology
At present, the application of LED more and more widely is used for daily indoor also just more and more universal with LED light fixture outdoor lighting.Traditional incandescent lamp and fluorescent lamp can dispose light adjusting circuit and carry out light modulation, and the output illumination of adjustment light is to satisfy needs of people.Also there is the demand of light modulation in the LED lamp, but because the particularity of LED lamp, traditional light adjusting circuit often can not adapt to the LED lamp.
Summary of the invention
Technical problem to be solved by this invention is the deficiency that overcomes prior art; Provide a kind of simple in structure, components and parts are few, adapt to that power bracket is wide, the light adjusting circuit of the narrow voltage LED lamp of good dimming effect, this light adjusting circuit can be realized LED lamp on a large scale, synchronous, stepless, continuous light tuning.
The technical scheme that the present invention adopted is: the present invention includes and be used for the power supply alternating current is become direct current and the rectification circuit of driving voltage is provided to said narrow voltage LED circuit for lamp; Be used to produce the multi-resonant oscillating circuit of periodic pulse signal; Be used to regulate the pulse-width modulation circuit of said multi-resonant oscillating circuit output pulse signal pulsewidth; Be used for providing the voltage stabilizing circuit of stable DC voltage to said multi-resonant oscillating circuit and said pulse-width modulation circuit; Be used to respond said multi-resonant oscillating circuit output pulse signal and the output switch circuit of recurrent pulse output is provided to said narrow voltage LED circuit for lamp; Said multi-resonant oscillating circuit comprises multivibrator; Said multivibrator is an astable multivibrator, and the output of the light adjusting circuit of said narrow voltage LED lamp connects a said narrow voltage LED circuit for lamp or connects the said narrow voltage LED circuit for lamp of a plurality of parallel connections.
Said voltage stabilizing circuit comprises dropping resistor, voltage stabilizing didoe and filter capacitor, is in series with said dropping resistor after said voltage stabilizing didoe and said filter capacitor are in parallel again, and is connected between the output positive and negative charge of said rectification circuit.
Said pulse-width modulation circuit comprises first resistance, second resistance, potentiometer, first electric capacity; The fixed resistance body of said first resistance, said potentiometer, said second resistance, said first electric capacity are in series successively and are connected between the output positive and negative charge of said rectification circuit; The sliding end of said potentiometer is connected with the positive pole of a switching diode and is connected with the discharge end of said multivibrator; The negative pole of said switching diode is connected with contact between said second resistance and said first electric capacity; And be connected with the sill end and the trigger end of said multivibrator; The reset terminal of said multivibrator and feeder ear are connected with the output of said voltage stabilizing circuit, the control voltage end of said multivibrator be connected with the earth terminal of said multivibrator again after second electric capacity is connected.
Said output switch circuit comprises at least one N slot field-effect transistor; The grid of each said N slot field-effect transistor is connected with the output of said multivibrator; The earth terminal of the source electrode of each said N slot field-effect transistor and the negative pole of output end of said rectification circuit, said multivibrator altogether; The drain electrode of each said N slot field-effect transistor is connected with the cathode output end of the light adjusting circuit of said narrow voltage LED lamp, and the output head anode of said rectification circuit is connected with the cathode output end of the light adjusting circuit of said narrow voltage LED lamp.
The light adjusting circuit of said narrow voltage LED lamp also comprises the inductance high-frequency filter circuit, and said inductance high-frequency filter circuit is connected to the power input before the said rectification circuit.
The light adjusting circuit of said narrow voltage LED lamp also comprises cold start-up overshoot protection circuit, and said cold start-up overshoot protection circuit is connected to the power input before the said rectification circuit.
The light adjusting circuit of said narrow voltage LED lamp also comprises power switch circuit, and said power switch circuit is connected to the power input before the said rectification circuit; The light adjusting circuit of said narrow voltage LED lamp also comprises short-circuit protection circuit, and said short-circuit protection circuit is connected to the power input before the said rectification circuit.
Said narrow voltage LED circuit for lamp comprises LED lamp rectification circuit, led light source load, constant-current source circuit; Electric current is by input input and after the rectification of said LED lamp rectification circuit, flow through successively said led light source load, said constant-current source circuit and constitute the loop; Said constant-current source circuit carries out voltage stabilizing, current stabilization to said led light source load; Said led light source load comprises at least one group of several LED that are in series; Said constant-current source circuit comprises at least one N channel depletion type field-effect transistor, and the drain electrode of said N channel depletion type field-effect transistor is a contact, and the source electrode of said N channel depletion type field-effect transistor and grid short circuit mutually constitute another contact; Perhaps; Said constant-current source circuit comprises at least one N channel junction field-effect transistors, and the drain electrode of said N channel junction field-effect transistors is a contact, and the source electrode of said N channel junction field-effect transistors and grid short circuit mutually constitute another contact.
Said narrow voltage LED circuit for lamp also comprises LED lamp short-circuit protection circuit, and said LED lamp short-circuit protection circuit is connected between input and the said LED lamp rectification circuit.
Said narrow voltage LED circuit for lamp also comprises LED lamp filter circuit; Said LED lamp filter circuit is connected to after the said LED lamp rectification circuit; Electric current after the rectification of said LED lamp rectification circuit again through the filtering of said LED lamp filter circuit, flow through successively more said led light source load, said constant-current source circuit and constitute the loop.
The invention has the beneficial effects as follows: be used for the power supply alternating current is become direct current and the rectification circuit of driving voltage is provided to said narrow voltage LED circuit for lamp owing to the present invention includes; Be used to produce the multi-resonant oscillating circuit of periodic pulse signal; Be used to regulate the pulse-width modulation circuit of said multi-resonant oscillating circuit output pulse signal pulsewidth; Be used for providing the voltage stabilizing circuit of stable DC voltage to said multi-resonant oscillating circuit and said pulse-width modulation circuit; Be used to respond said multi-resonant oscillating circuit output pulse signal and the output switch circuit of recurrent pulse output is provided to said narrow voltage LED circuit for lamp; Said multi-resonant oscillating circuit comprises multivibrator; Said multivibrator is an astable multivibrator, and the output of the light adjusting circuit of said narrow voltage LED lamp connects a said narrow voltage LED circuit for lamp or connects the said narrow voltage LED circuit for lamp of a plurality of parallel connections; The civil power alternating current becomes Rectified alternating current after said rectification circuit rectification, after said voltage stabilizing circuit voltage stabilizing, stable DC voltage is provided for said multi-resonant oscillating circuit and said pulse-width modulation circuit; Under said pulse-width modulation circuit control; Adjust the pulsewidth of said multi-resonant oscillating circuit output pulse signal, promptly adjust duty ratio, make said output switch circuit recurrent pulse output is provided to said narrow voltage LED circuit for lamp; Switching current promptly periodically is provided; Make said narrow voltage LED circuit for lamp periodically obtain power supply, thus the power of adjustment LED, and then obtain the adjusting variation that light is exported; The pulsewidth of the dc pulse signal that is the present invention through regulating said multi-resonant oscillating circuit output and duty ratio and then control the opening and closing of said output switch circuit; With the power supply and the light modulation of control LED lamp, so the present invention is simple in structure, components and parts are few, wide, the good dimming effect of adaptation power bracket, this light adjusting circuit can be realized LED lamp on a large scale, synchronous, stepless, continuous light tuning.
Description of drawings
Fig. 1 is the light adjusting circuit sketch map of the narrow voltage LED lamp of the embodiment of the invention one and embodiment two;
Fig. 2 is the light adjusting circuit sketch map of the narrow voltage LED lamp of the embodiment of the invention three and embodiment four;
Fig. 3 is the narrow voltage LED circuit for lamp sketch map of the embodiment of the invention one;
Fig. 4 is the narrow voltage LED circuit for lamp sketch map of the embodiment of the invention two;
Fig. 5 is the narrow voltage LED circuit for lamp sketch map of the embodiment of the invention three;
Fig. 6 is the narrow voltage LED circuit for lamp sketch map of the embodiment of the invention four;
Fig. 7 is the chip internal circuit diagram of the multivibrator of the embodiment of the invention;
Fig. 8 is the typical application sketch map of the multivibrator of the embodiment of the invention;
Fig. 9 is the pulse signal output sketch map of the multivibrator of the embodiment of the invention;
Figure 10 is the principle schematic of the light adjusting circuit of narrow voltage LED lamp of the present invention.
Embodiment
Embodiment one:
Like Fig. 1, shown in Figure 10; The light adjusting circuit of the narrow voltage LED lamp of present embodiment comprises and is used for the power supply alternating current is become direct current and the rectification circuit 1 of driving voltage is provided to said narrow voltage LED circuit for lamp 10; Be used to produce the multi-resonant oscillating circuit 8 of periodic pulse signal; Be used to regulate the pulse-width modulation circuit 7 of said multi-resonant oscillating circuit 8 output pulse signal pulsewidths; Be used for providing the voltage stabilizing circuit 6 of stable DC voltage to said multi-resonant oscillating circuit 8 and said pulse-width modulation circuit 7, be used to respond said multi-resonant oscillating circuit 8 output pulse signals and to said narrow voltage LED circuit for lamp 10 output switch circuit 9 of recurrent pulse output be provided, said multi-resonant oscillating circuit 8 comprises multivibrator U1; Said multivibrator U1 is an astable multivibrator; Adopt common LMC555 timer, the output of the light adjusting circuit of said narrow voltage LED lamp connects a said narrow voltage LED circuit for lamp 10, and promptly the light adjusting circuit of present embodiment carries out light modulation to a narrow voltage LED lamp; Said voltage stabilizing circuit 6 comprises dropping resistor R1, voltage stabilizing didoe D2 and filter capacitor C1, is in series with said dropping resistor R1 after said voltage stabilizing didoe D2 and said filter capacitor C1 are in parallel again, and is connected between the output positive and negative charge of said rectification circuit 1; It is rectifier bridge D1 that said light modulation rectification circuit 1 adopts bridge rectifier; Can certainly adopt other rectifier system rectifications; Said pulse-width modulation circuit 7 comprises first resistance R 2, second resistance R 3, potentiometer RW1, first capacitor C 2; The fixed resistance body of said first resistance R 2, said potentiometer RW1, said second resistance R 3, said first capacitor C 2 are in series successively and are connected between the output positive and negative charge of said rectification circuit 1; The sliding end of said potentiometer RW1 is connected with the positive pole of a switching diode D3 and is connected with the discharge end DISCHARGE of said multivibrator U1; The negative pole of said switching diode D3 is connected with contact between said second resistance R 3 and said first capacitor C 2; And be connected with sill end THRESHOLD and the trigger end TRIGGER of said multivibrator U1; The reset terminal RESET of said multivibrator U1 and feeder ear V+ are connected with the output of said voltage stabilizing circuit 6, the control voltage end CONTROL of said multivibrator U1 be connected with the earth terminal GROUND of said multivibrator U1 again after second capacitor C 3 is connected; Said output switch circuit 9 comprises a N slot field-effect transistor Q1; The grid of said N slot field-effect transistor Q1 is connected with the output OUTPUT of said multivibrator U1; The earth terminal GROUND of the source electrode of said N slot field-effect transistor Q1 and the negative pole of output end of said rectification circuit 1, said multivibrator U1 altogether; The drain electrode of said N slot field-effect transistor Q1 is connected with the cathode output end of the light adjusting circuit of said narrow voltage LED lamp, and the output head anode of said rectification circuit 1 is connected with the cathode output end of the light adjusting circuit of said narrow voltage LED lamp; The light adjusting circuit of said narrow voltage LED lamp also comprises cold start-up overshoot protection circuit 2, inductance high-frequency filter circuit 3, power switch circuit 4, short-circuit protection circuit 5; Said cold start-up overshoot protection circuit 2 comprises negative tempperature coefficient thermistor NTC, is connected to said rectification circuit 1 power firestreak input before, is used for when starting first, suppressing surge current; Said inductance high-frequency filter circuit 3 comprises High frequency filter inductance L 1; Be connected to said rectification circuit 1 zero-power line input before, said power switch circuit 4 comprises switch element S1, is connected to said light modulation rectification circuit 1 power firestreak input before; The switch that is used for whole light adjusting circuit; Said light modulation short-circuit protection circuit 5 comprises protective tube F1, is connected to said light modulation rectification circuit 1 zero-power line input before, is used for short-circuit protection.
As shown in Figure 3; Said narrow voltage LED circuit for lamp 10 comprises LED lamp rectification circuit, led light source load, constant-current source circuit; Electric current is by input input and after the rectification of said LED lamp rectification circuit, flow through successively said led light source load, said constant-current source circuit and constitute the loop; Said constant-current source circuit carries out voltage stabilizing, current stabilization to said led light source load; Said led light source load comprises one group of several LED that are in series, i.e. LED 1a～LED1x, and said constant-current source circuit comprises a N channel depletion type field-effect transistor Q1a; The drain electrode of said N channel depletion type field-effect transistor Q1a is a contact; The source electrode of said N channel depletion type field-effect transistor Q1a and grid short circuit mutually constitute another contact, and when the voltage of said N channel depletion type field-effect transistor Q1a between grid and source electrode was zero, the drain-source electrode current had been the constant current conducting; Since depletion mode fet when grid voltage is zero the characteristic of conducting and when drain voltage increases electric current puncture up to drain avalanche in the saturation region basically; So it can be used as a constant-current source and uses, in the present embodiment, the saturated cut-in voltage of said N channel depletion type field-effect transistor Q1a is certain particular value of 0.5～5V scope; Said LED lamp rectification circuit comprises the bridge rectifier that is made up of four rectifier diode D1a～D4a, and said narrow voltage LED circuit for lamp 10 also comprises LED lamp short-circuit protection circuit, and said LED lamp short-circuit protection circuit comprises protective tube F1a; Be connected between input and the said LED lamp rectification circuit, when the circuit overcurrent, said protective tube F1a fusing; Play a protective role; Can certainly adopt other forms of protective circuit, the pulsating direct current formula LED lamp that the narrow voltage LED lamp in the present embodiment is a kind of no electrolytic capacitor does not comprise filter capacitor; Making the reactive power of circuit significantly reduce, is a kind of LED lamp and light adjusting circuit of High Power Factor therefore.
Like Fig. 7, Fig. 8, shown in Figure 9, be LMC555 chip internal circuit theory sketch map, typical application sketch map and pulse signal output sketch map.The series connection of three 100K Ω resistance R is arranged in the LMC555 chip, make the first amplifier OP1+terminal voltage is (1/3) Vs, the second amplifier OP2-end (being 5 pin of LMC555) voltage is (2/3) Vs; When Vs was charged to (2/3) Vs through Ra, Rb to C, the second amplifier OP2 exported high level, rest-set flip-flop set at typical circuit; The output OUTPUT of said multivibrator U1 (3 pin) output low level 0V; Inner metal-oxide-semiconductor is logical, 7 pin ground connection, and C discharges to 7 pin through Rb; When discharging into (1/3) Vs, the first amplifier OP1 exports high level, and rest-set flip-flop is put and resetted, 3 pin output high level Vs, and inner metal-oxide-semiconductor is closed, 7 pin open circuit, Vs charges to C through Ra, Rb, goes round and begins again, and has formed vibration, and 3 pin are output as recurrent pulse; Therefore, the output OUTPUT of said multivibrator U1 exports periodic pulse signal, and pulsewidth t1 is by the charge constant decision of Ra, Rb and C, and stand-down, t2 was determined by the discharge time constant of Rb and C.In the present embodiment, the frequency and the pulsewidth of the periodic pulse signal that the parameter determining of said potentiometer RW1 and said first resistance R 2, said second resistance R 3, potentiometer RW1, said first capacitor C 2 is shown in Figure 9, wherein; Pulsewidth t1=0.693 * (R2+RW1 is last) * C2, stand-down t2=0.693 * (under the R3+RW1) * C2, cycle T=t1+t2=0.693 * (R2+R3+RW) * C2; So regulate the pulsewidth t1 that said potentiometer RW1 can change the output signal; And not changing the cycle T of signal, this is the peculiar structure of this circuit, in the present embodiment; Frequency of oscillation f=1/T ≈ 2KHz, duty ratio D=t1/T=0.01～0.995 is adjustable continuously.Therefore the present invention has realized passing through with said N channel depletion type field-effect transistor Q1a; The turnable pulse width signal is become driving output; Can drive one or more narrow voltage LED lamps simultaneously; Realized that high or low power is easy to adjust, can be applicable to one or more LED lamps, realize brightness on a large scale, synchronous, stepless, adjustable continuously.
Embodiment two:
Like Fig. 1, Fig. 4, Fig. 7～shown in Figure 10; The difference of present embodiment and embodiment one is: in the present embodiment; The said constant-current source circuit of said narrow voltage LED circuit for lamp 10 comprises a N channel junction field-effect transistors Q2a; The drain electrode of said N channel junction field-effect transistors Q2a is a contact; The source electrode of said N channel junction field-effect transistors Q2a and grid short circuit mutually constitute another contact, and promptly present embodiment adopts N channel junction field-effect transistors Q2a to replace the said N channel depletion type field-effect transistor Q1a among the embodiment one, and the function of the two realization is identical with effect; In addition; Said narrow voltage LED circuit for lamp 10 also comprises LED lamp filter circuit; Said LED lamp filter circuit comprises LED lamp filter capacitor C1a, bleeder resistance R1a; Said LED lamp filter capacitor C1a and said bleeder resistance R1a are in parallel and are connected to the output of said LED lamp rectification circuit, electric current after the rectification of said LED lamp rectification circuit again through the filtering of said LED lamp filter circuit, flow through successively more said led light source load, said constant-current source circuit and constitute the loop.The said narrow voltage LED lamp of present embodiment is a kind of LED lamp that the intimate direct current supply of electrochemical capacitor is arranged, its filtering voltage regulation better effects if.
All the other characteristics of present embodiment are with embodiment one.
Embodiment three:
Like Fig. 2, Fig. 5, Fig. 7～shown in Figure 10; The difference of present embodiment and embodiment one is: in the present embodiment; The output of the light adjusting circuit of said narrow voltage LED lamp connects the said narrow voltage LED circuit for lamp 10 of a plurality of parallel connections, and promptly the light adjusting circuit of present embodiment carries out light modulation to a plurality of narrow voltage LED lamps simultaneously; The said output switch circuit 9 of the light adjusting circuit of said narrow voltage LED lamp comprises several N slot field-effect transistors Q1; The grid of each said N slot field-effect transistor Q1 is connected with the output OUTPUT of said multivibrator U1; The earth terminal GROUND of the source electrode of each said N slot field-effect transistor Q1 and the negative pole of output end of said rectification circuit 1, said multivibrator U1 altogether; The drain electrode of each said N slot field-effect transistor Q1 is connected with the cathode output end of the light adjusting circuit of said narrow voltage LED lamp, and several said N slot field-effect transistor Q1 provide bigger power output; In addition; The said constant-current source circuit of said narrow voltage LED circuit for lamp 10 comprises a N channel junction field-effect transistors Q2a; The drain electrode of said N channel junction field-effect transistors Q2a is a contact; The source electrode of said N channel junction field-effect transistors Q2a and grid short circuit mutually constitute another contact, and promptly present embodiment adopts N channel junction field-effect transistors Q2a to replace the said N channel depletion type field-effect transistor Q1a among the embodiment one, and the function of the two realization is identical with effect.
All the other characteristics of present embodiment are with embodiment one.
Embodiment four:
Like Fig. 2, Fig. 6, Fig. 7～shown in Figure 10; The difference of present embodiment and embodiment one is: in the present embodiment; The output of the light adjusting circuit of said narrow voltage LED lamp connects the said narrow voltage LED circuit for lamp 10 of a plurality of parallel connections, and promptly the light adjusting circuit of present embodiment carries out light modulation to a plurality of narrow voltage LED lamps simultaneously; The said output switch circuit 9 of the light adjusting circuit of said narrow voltage LED lamp comprises several N slot field-effect transistors Q1; The grid of each said N slot field-effect transistor Q1 is connected with the output OUTPUT of said multivibrator U1; The earth terminal GROUND of the source electrode of each said N slot field-effect transistor Q1 and the negative pole of output end of said rectification circuit 1, said multivibrator U1 altogether; The drain electrode of each said N slot field-effect transistor Q1 is connected with the cathode output end of the light adjusting circuit of said narrow voltage LED lamp, and several said N slot field-effect transistor Q1 provide bigger power output; In addition; Said narrow voltage LED circuit for lamp 10 also comprises LED lamp filter circuit; Said LED lamp filter circuit comprises LED lamp filter capacitor C1a, bleeder resistance R1a; Said LED lamp filter capacitor C1a and said bleeder resistance R1a are in parallel and are connected to the output of said LED lamp rectification circuit, electric current after the rectification of said LED lamp rectification circuit again through the filtering of said LED lamp filter circuit, flow through successively more said led light source load, said constant-current source circuit and constitute the loop.The said narrow voltage LED lamp of present embodiment is a kind of LED lamp that the intimate direct current supply of electrochemical capacitor is arranged, its filtering voltage regulation better effects if.
All the other characteristics of present embodiment are with embodiment one.
Above embodiment only illustrates; Be not to be limitation of the present invention; Said led light source load also can be several LED that many groups are in series; And every group of said led light source load be connected in series one or more said N channel depletion type field-effect transistor Q1a or said N channel junction field-effect transistors Q2a, and perhaps the said led light source load of many groups is connected in series one or more said N channel depletion type field-effect transistor Q1a or said N channel junction field-effect transistors Q2a.
The present invention can be widely used in LED lamp light adjusting circuit field.
Claims (10)
1. the light adjusting circuit of one kind narrow voltage LED lamp; It is characterized in that: comprise being used for the power supply alternating current is become direct current and the rectification circuit (1) of driving voltage is provided to said narrow voltage LED circuit for lamp (10); Be used to produce the multi-resonant oscillating circuit (8) of periodic pulse signal; Be used to regulate the pulse-width modulation circuit (7) of said multi-resonant oscillating circuit (8) output pulse signal pulsewidth; Be used for providing the voltage stabilizing circuit (6) of stable DC voltage to said multi-resonant oscillating circuit (8) and said pulse-width modulation circuit (7); Be used to respond said multi-resonant oscillating circuit (8) output pulse signal and the output switch circuit (9) of recurrent pulse output is provided to said narrow voltage LED circuit for lamp (10); Said multi-resonant oscillating circuit (8) comprises multivibrator (U1); Said multivibrator (U1) is an astable multivibrator, and the output of the light adjusting circuit of said narrow voltage LED lamp connects a said narrow voltage LED circuit for lamp (10) or connects the said narrow voltage LED circuit for lamp (10) of a plurality of parallel connections.
2. the light adjusting circuit of narrow voltage LED lamp according to claim 1; It is characterized in that: said voltage stabilizing circuit (6) comprises dropping resistor (R1), voltage stabilizing didoe (D2) and filter capacitor (C1); Said voltage stabilizing didoe (D2) is in series with said dropping resistor (R1) after being in parallel with said filter capacitor (C1) again, is connected between the output positive and negative charge of said rectification circuit (1).
3. the light adjusting circuit of narrow voltage LED lamp according to claim 1; It is characterized in that: said pulse-width modulation circuit (7) comprises first resistance (R2), second resistance (R3), potentiometer (RW1), first electric capacity (C2); The fixed resistance body of said first resistance (R2), said potentiometer (RW1), said second resistance (R3), said first electric capacity (C2) are in series successively and are connected between the output positive and negative charge of said rectification circuit (1); The sliding end of said potentiometer (RW1) is connected with the positive pole of a switching diode (D3) and is connected with the discharge end (DISCHARGE) of said multivibrator (U1); The negative pole of said switching diode (D3) is connected with contact between said second resistance (R3) and said first electric capacity (C2); And be connected with sill end (THRESHOLD) and the trigger end (TRIGGER) of said multivibrator (U1); The reset terminal (RESET) of said multivibrator (U1) and feeder ear (V+) are connected with the output of said voltage stabilizing circuit (6), the control voltage end (CONTROL) of said multivibrator (U1) be connected with the earth terminal (GROUND) of said multivibrator (U1) again after second electric capacity (C3) is connected.
4. the light adjusting circuit of narrow voltage LED lamp according to claim 1; It is characterized in that: said output switch circuit (9) comprises at least one N slot field-effect transistor (Q1a); The grid of each said N slot field-effect transistor (Q1a) is connected with the output (OUTPUT) of said multivibrator (U1); The earth terminal (GROUND) of the negative pole of output end of the source electrode of each said N slot field-effect transistor (Q1a) and said rectification circuit (1), said multivibrator (U1) altogether; The drain electrode of each said N slot field-effect transistor (Q1a) is connected with the cathode output end of the light adjusting circuit of said narrow voltage LED lamp, and the output head anode of said rectification circuit (1) is connected with the cathode output end of the light adjusting circuit of said narrow voltage LED lamp.
5. according to the light adjusting circuit of any described narrow voltage LED lamp of claim 1 to 4; It is characterized in that: the light adjusting circuit of said narrow voltage LED lamp also comprises inductance high-frequency filter circuit (3), and said inductance high-frequency filter circuit (3) is connected to said rectification circuit (1) power input before.
6. according to the light adjusting circuit of any described narrow voltage LED lamp of claim 1 to 4; It is characterized in that: the light adjusting circuit of said narrow voltage LED lamp also comprises cold start-up overshoot protection circuit (2), and said cold start-up overshoot protection circuit (2) is connected to said rectification circuit (1) power input before.
7. according to the light adjusting circuit of any described narrow voltage LED lamp of claim 1 to 4; It is characterized in that: the light adjusting circuit of said narrow voltage LED lamp also comprises power switch circuit (4), and said power switch circuit (4) is connected to said rectification circuit (1) power input before; The light adjusting circuit of said narrow voltage LED lamp also comprises short-circuit protection circuit (5), and said short-circuit protection circuit (5) is connected to said rectification circuit (1) power input before.
8. according to the light adjusting circuit of any described narrow voltage LED lamp of claim 1 to 4; It is characterized in that: said narrow voltage LED circuit for lamp (10) comprises LED lamp rectification circuit, led light source load, constant-current source circuit; Electric current is by input input and after the rectification of said LED lamp rectification circuit, flow through successively said led light source load, said constant-current source circuit and constitute the loop; Said constant-current source circuit carries out voltage stabilizing, current stabilization to said led light source load; Said led light source load comprises at least one group of several LED that are in series; Said constant-current source circuit comprises at least one N channel depletion type field-effect transistor, and the drain electrode of said N channel depletion type field-effect transistor is a contact, and the source electrode of said N channel depletion type field-effect transistor and grid short circuit mutually constitute another contact; Perhaps; Said constant-current source circuit comprises at least one N channel junction field-effect transistors, and the drain electrode of said N channel junction field-effect transistors is a contact, and the source electrode of said N channel junction field-effect transistors and grid short circuit mutually constitute another contact.
9. the light adjusting circuit of narrow voltage LED lamp according to claim 8; It is characterized in that: said narrow voltage LED circuit for lamp (10) also comprises LED lamp short-circuit protection circuit, and said LED lamp short-circuit protection circuit is connected between input and the said LED lamp rectification circuit.
10. the light adjusting circuit of narrow voltage LED lamp according to claim 8; It is characterized in that: said narrow voltage LED circuit for lamp (10) also comprises LED lamp filter circuit; Said LED lamp filter circuit is connected to after the said LED lamp rectification circuit; Electric current after the rectification of said LED lamp rectification circuit again through the filtering of said LED lamp filter circuit, flow through successively more said led light source load, said constant-current source circuit and constitute the loop.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101404450A CN102647835A (en) | 2012-04-29 | 2012-04-29 | Dimming circuit of narrow voltage light emitting diode (LED) lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101404450A CN102647835A (en) | 2012-04-29 | 2012-04-29 | Dimming circuit of narrow voltage light emitting diode (LED) lamp |
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| CN102647835A true CN102647835A (en) | 2012-08-22 |
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| CN2012101404450A Pending CN102647835A (en) | 2012-04-29 | 2012-04-29 | Dimming circuit of narrow voltage light emitting diode (LED) lamp |
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| CN110542766A (en) * | 2019-08-22 | 2019-12-06 | 中国船舶重工集团公司第七0七研究所九江分部 | processing circuit suitable for acoustic Doppler measures velocity of flow |
| CN112152593A (en) * | 2020-09-18 | 2020-12-29 | 深圳瑞波光电子有限公司 | Drive circuit and laser device |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102739076A (en) * | 2011-04-09 | 2012-10-17 | 赵文志 | Direct current stabilized voltage supply |
| CN103096582A (en) * | 2012-12-07 | 2013-05-08 | 刘胜泉 | Light emitting diode (LED) indicating lamp with single connection switch |
| CN105278408A (en) * | 2015-10-26 | 2016-01-27 | 重庆电子工程职业学院 | Multifunctional timer circuit based on computer IC control |
| CN105278408B (en) * | 2015-10-26 | 2017-07-25 | 重庆电子工程职业学院 | A kind of Multifunctional timer circuit controlled based on computer IC |
| CN110542766A (en) * | 2019-08-22 | 2019-12-06 | 中国船舶重工集团公司第七0七研究所九江分部 | processing circuit suitable for acoustic Doppler measures velocity of flow |
| CN112152593A (en) * | 2020-09-18 | 2020-12-29 | 深圳瑞波光电子有限公司 | Drive circuit and laser device |
| CN112152593B (en) * | 2020-09-18 | 2024-05-10 | 深圳瑞波光电子有限公司 | Driving circuit and laser device |
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Application publication date: 20120822 |