CN102858076B - LED (Light Emitting Diode) spotlight circuit compatible with electronic transformer - Google Patents
LED (Light Emitting Diode) spotlight circuit compatible with electronic transformer Download PDFInfo
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- CN102858076B CN102858076B CN201210409347.2A CN201210409347A CN102858076B CN 102858076 B CN102858076 B CN 102858076B CN 201210409347 A CN201210409347 A CN 201210409347A CN 102858076 B CN102858076 B CN 102858076B
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Abstract
The invention relates to an LED (Light Emitting Diode) spotlight circuit compatible with an electronic transformer. The LED spotlight circuit comprises a high frequency electronic transformer circuit, a rectification and filter circuit, a voltage boost circuit, a voltage reduction and constant current circuit and an LED module, wherein the voltage boost circuit comprises an integrated circuit U1, an electrolytic capacitor C11, a triode Q2, a diode D4, a diode D5, an inductor L3, a resistor R4, a high frequency switching tube Q3, a biasing resistor R13, a resistor R14 and an electrolytic capacitor C3; the positive electrode of the diode D5 and the collector electrode of the high frequency switching tube Q3 are both connected with the other end of the inductor L3; the positive electrode of the diode D4 and the positive electrode of the electrolytic capacitor C3 are both connected with the negative electrode of the diode D5; one end of the resistor R4, the collector electrode of the triode Q2 are both connected with the negative electrode of the diode D4; and the positive electrode of the electrolytic capacitor C11, a 6th pin of the integrated circuit U1 and one end of the biasing resistor R13 are both connected with the emitter electrode of the triode Q2. The LED spotlight circuit provided by the invention is compatible with the electronic transformer.
Description
Technical field
The present invention relates to LED drive circuit technical field, particularly relate to a kind of LED spotlight circuit that can compatible electronic transformer.
Background technology
Along with the development of semiconductor light emitting technology, LED also obtains using more and more widely because of the advantage such as it is energy-conservation, the life-span is long.LED is high lumen value and excellent luminous intensity distribution performance because its luminous flux has, and in dissimilar MR16 type Lamp cup, uses in a large number.But, there is a general problem in the high-frequency electronic transformer drive circuit of prior art, it is exactly the problem that electronic transformer can not be compatible, the market overwhelming majority's MR16 shot-light has all adopted the BUCK topological circuit of one-level now, as shown in Figure 1: Fig. 1 is a kind of LED spotlight circuit schematic diagram of prior art, because electronic transformer is output as the high frequency ac signal about 12V, because this kind of topological circuit is at four rectifier diodes (that is: diode D1, diode D2, diode D6 and diode D8) be provided with an electrochemical capacitor C that capacitance is larger below, this electrochemical capacitor C charging current is very large, and moment just stops charging after filling and satisfying, can cause like this high-frequency electronic transformer normally to work, there is intermittent output, practical manifestation phenomenon is out exactly that LED is in constantly flicker.Voltage after this electrochemical capacitor C charging is lower than 12V, and when the LED series connection VF voltage connecting approaches or surpasses 12V, LED lamp can not normally be lighted.Along with society constantly develops with science and technology, constantly improve, LED shot-light is also constantly updating, and people have higher requirement at its high-frequency electronic transformer drive circuit to LED shot-light aspect compatible.Therefore, people urgently wish that a kind of LED spotlight circuit that can compatible electronic transformer comes out.
Summary of the invention
Technical problem to be solved by this invention is: overcome that the high-frequency electronic transformer drive circuit of prior art exists can not compatible electronic transformer defect, meet people's hope and the market demand of LED shot-light, a kind of LED spotlight circuit that can compatible electronic transformer is provided, this can compatible electronic transformer LED spotlight circuit completely can compatible prior art electronic transformer, in LED shot-light, install after circuit of the present invention, LED shot-light is in lighting process, LED there will not be scintillation, people can obtain best lighting effect, and can reach energy-conservation object.
The technical solution adopted for the present invention to solve the technical problems is: a kind of LED spotlight circuit that can compatible electronic transformer, comprise high-frequency electronic transformer circuit, current rectifying and wave filtering circuit, step-down constant-current circuit and LED module, this LED spotlight circuit that can compatible electronic transformer also comprises booster circuit, and described high-frequency electronic transformer circuit, current rectifying and wave filtering circuit, booster circuit, step-down constant-current circuit and LED module are connected successively; Described booster circuit comprises integrated circuit U1, electrochemical capacitor C11, triode Q2, diode D4, diode D5, inductance L 3, resistance R 4, HF switch pipe Q3, biasing resistor R13, resistance R 14, resistance R 16, resistance R 17 and electrochemical capacitor C3; The output of current rectifying and wave filtering circuit is connected with inductance L 3 one end, and the drain electrode of the positive pole of diode D5, HF switch pipe Q3 is all connected with the other end of inductance L 3; The positive pole of the positive pole of diode D4, electrochemical capacitor C3 is all connected with the negative pole of diode D5; The minus earth of electrochemical capacitor C3; Resistance R 16 one end, resistance R 17 one end are all connected with the source electrode of HF switch pipe Q3, resistance R 16 other ends, the equal ground connection of resistance R 17 other end; The grid of HF switch pipe Q3 is connected with resistance R 14 one end, and 5 pins of resistance R 14 other ends and integrated circuit U1 are connected; The collector electrode of resistance R 4 one end, triode Q2 is all connected with the negative pole of diode D4, resistance R 4 other ends are connected with the base stage of triode Q2,6 pins of the positive pole of electrochemical capacitor C11, integrated circuit U1, biasing resistor R13 one end are all connected with the emitter of triode Q2, and 4 pins of high-frequency electronic transformer are connected with the biasing resistor R13 other end; The minus earth of electrochemical capacitor C11; Described booster circuit also comprises voltage stabilizing didoe D11, and the base stage of described triode Q2, resistance R 4 other ends are all connected with the negative pole of voltage stabilizing didoe D11, ground connection again after the positive pole of the negative pole of described electrochemical capacitor C11 and voltage stabilizing didoe D11 is connected; Described booster circuit also comprises resistance R 12 and capacitor C 13,8 pins of capacitor C 13 one end, integrated circuit U1 are all connected with resistance R 12 one end, and the emitter of 6 pins of integrated circuit U1, the positive pole of electrochemical capacitor C11, triode Q2, biasing resistor R13 one end are all connected with resistance R 12 other ends; Capacitor C 13 other end ground connection; Described booster circuit also comprises constant voltage resistance R a, the negative pole of the positive pole of the positive pole of diode D4, electrochemical capacitor C3, diode D5 is all connected with one end of constant voltage resistance R a, and the source electrode of peak current detection resistance R 15 one end, resistance R 16 one end, resistance R 17 one end, HF switch pipe Q3 is all connected with the other end of constant voltage resistance R a.
In technique scheme, described booster circuit also comprises peak current detection resistance R 15, the source electrode of described HF switch pipe Q3, resistance R 16 one end, resistance R 17 one end are all connected with peak current detection resistance R 15 one end, and 4 pins of high-frequency electronic transformer, the biasing resistor R13 other end are all connected with peak current detection resistance R 15 other ends.
Further, described booster circuit also comprises overvoltage protection diode D12, and the positive pole of diode D4 is connected with one end of overvoltage protection diode D12, and the source electrode of HF switch pipe Q3 is connected with the other end of overvoltage protection diode D12.
Further, described LED module is in series with a plurality of LED or is parallel with a plurality of LED.
The invention has the beneficial effects as follows: 1, this can compatible electronic transformer LED spotlight circuit completely can compatible prior art electronic transformer, in LED shot-light, install after circuit of the present invention, LED shot-light is in lighting process, LED there will not be scintillation, people can obtain best lighting effect, and can reach energy-conservation object.2, due to the present invention completely can compatible prior art electronic transformer, described in, what LED shot-light user can be according to oneself need to join high-frequency electronic transformer.3, when using the present invention to replace the drive circuit in old Halogen lamp LED, the drive circuit that can dismantle in old Halogen lamp LED, and directly topological circuit Lamp cup of the present invention is installed into, thereby can save installation and the demolition works expense that number is larger.4, because the present invention has High Power Factor value, so, when installing in enormous quantities and use is of the present invention, to the interference of electrical network seldom, electrical network is very helpful.5, type of the present invention adopts accurate constant current to control, and can extend the useful life of light fixture.6, compare with the LED number of connecting in the LED module of prior art, in LED module of the present invention, can suitably increase LED number, the optical efficiency that this is conducive to improve complete machine, makes the power savings advantages of LED more obvious.7, the present invention is reasonable in design, because the present invention has above-mentioned advantage, so, include LED shot-light of the present invention and there are wide market prospects.
Accompanying drawing explanation
Fig. 1 is a kind of LED spotlight circuit schematic diagram of prior art;
Fig. 2 is the circuit diagram of first embodiment of the present invention;
Fig. 3 is the enlarged drawing of the booster circuit in Fig. 2;
Fig. 4 is the circuit diagram of second embodiment of the present invention;
Description of reference numerals in Fig. 2 to Fig. 4: 1---high-frequency electronic transformer circuit; 2---current rectifying and wave filtering circuit; 3---booster circuit; 4---step-down constant-current circuit; 5---LED module.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation, is not practical range of the present invention is confined to this.
Embodiment mono-, as shown in Figures 2 and 3, a kind of LED spotlight circuit that can compatible electronic transformer described in the present embodiment, comprise high-frequency electronic transformer circuit 1, current rectifying and wave filtering circuit 2, step-down constant-current circuit 4 and LED module 5, this can compatible electronic transformer LED spotlight circuit also comprise booster circuit 3, described high-frequency electronic transformer circuit 1, current rectifying and wave filtering circuit 2, booster circuit 3, step-down constant-current circuit 4 and LED module are connected successively; Described booster circuit 3 comprises integrated circuit U1, electrochemical capacitor C11, triode Q2, diode D4, diode D5, inductance L 3, resistance R 4, HF switch pipe Q3, biasing resistor R13, resistance R 14, resistance R 16, resistance R 17 and electrochemical capacitor C3; The output of current rectifying and wave filtering circuit 2 is connected with inductance L 3 one end, and the drain electrode of the positive pole of diode D5, HF switch pipe Q3 is all connected with the other end of inductance L 3; The positive pole of the positive pole of diode D4, electrochemical capacitor C3 is all connected with the negative pole of diode D5; The minus earth of electrochemical capacitor C3; Resistance R 16 one end, resistance R 17 one end are all connected with the source electrode of HF switch pipe Q3, resistance R 16 other ends, the equal ground connection of resistance R 17 other end; The grid of HF switch pipe Q3 is connected with resistance R 14 one end, and 5 pins of resistance R 14 other ends and integrated circuit U1 are connected; The collector electrode of resistance R 4 one end, triode Q2 is all connected with the negative pole of diode D4, resistance R 4 other ends are connected with the base stage of triode Q2,6 pins of the positive pole of electrochemical capacitor C11, integrated circuit U1, biasing resistor R13 one end are all connected with the emitter of triode Q2, and 4 pins of integrated circuit U1 are connected with the biasing resistor R13 other end; The minus earth of electrochemical capacitor C11; Described booster circuit 3 also comprises voltage stabilizing didoe D11, and the base stage of described triode Q2, resistance R 4 other ends are all connected with the negative pole of voltage stabilizing didoe D11, ground connection again after the positive pole of the negative pole of described electrochemical capacitor C11 and voltage stabilizing didoe D11 is connected; Described booster circuit 3 also comprises resistance R 12 and capacitor C 13,8 pins of capacitor C 13 one end, integrated circuit U1 are all connected with resistance R 12 one end, and the emitter of 6 pins of integrated circuit U1, the positive pole of electrochemical capacitor C11, triode Q2, biasing resistor R13 one end are all connected with resistance R 12 other ends; Capacitor C 13 other end ground connection; Described booster circuit 3 also comprises constant voltage resistance R a, the negative pole of the positive pole of the positive pole of diode D4, electrochemical capacitor C3, diode D5 is all connected with one end of constant voltage resistance R a, and the source electrode of peak current detection resistance R 15 one end, resistance R 16 one end, resistance R 17 one end, HF switch pipe Q3 is all connected with the other end of constant voltage resistance R a.Described booster circuit 3 also comprises peak current detection resistance R 15, the emitter of described HF switch pipe Q3, resistance R 16 one end, resistance R 17 one end are all connected with peak current detection resistance R 15 one end, and 4 pins of integrated circuit U1, the biasing resistor R13 other end are all connected with peak current detection resistance R 15 other ends.Described booster circuit 3 also comprises overvoltage protection diode D12, and the positive pole of diode D4 is connected with one end of overvoltage protection diode D12, and the source electrode of HF switch pipe Q3 is connected with the other end of overvoltage protection diode D12.Described booster circuit 3 also comprises capacitor C 15, and 2 pins of integrated circuit U1 are connected with capacitor C 15 one end, capacitor C 15 other end ground connection.Described booster circuit 3 also comprises capacitor C 17, capacitor C 4 and resistance R 18, capacitor C 4 and resistance R 18 are first connected in parallel with capacitor C 17, electrochemical capacitor C3 again, one end after the positive pole parallel connection of resistance R 18 one end, capacitor C 17 one end, electrochemical capacitor C3 connects the negative pole of diode D5, resistance R 18 other ends are connected with capacitor C 4 one end, the other end ground connection after the negative pole parallel connection of capacitor C 4 other ends, capacitor C 17 other ends and electrochemical capacitor C3.Described LED module 5 is in series with four string LED.A kind of described in the present embodiment can compatible electronic transformer LED spotlight circuit adopted first boost after the two-stage body frame structure of step-down, the framework that boosts is booster circuit 3, step-down framework is step-down constant-current circuit 4.The operation principle of booster circuit 3 is: when high-frequency electronic transformer circuit 1, after current rectifying and wave filtering circuit 2 starts, circuit is by inductance L 3, diode D5, diode D4, resistance R 4, triode Q2 charges to electrochemical capacitor C11, when the voltage of electrochemical capacitor C11 charging reaches the starting resistor of integrated circuit U1, high-frequency electronic transformer is started working, these will be at the 5 pin output pwm signals of integrated circuit U1, when HF switch pipe Q3 conducting, main circuit current is through inductance L 3, HF switch pipe Q3, resistance R 16, the GND of resistance R 17 to integrated circuit U1, now inductance L 3 will be recharged, when 4 pins of integrated circuit U1 reach peak current threshold values, the 5 pin output low levels of integrated circuit U1, HF switch pipe Q3 turn-offs, inductance L 3 has been charged, now, because the electromotive force in inductance L 3 can not suddenly change, the unborn induced voltage of inductance L 3 will be oppositely and the voltage stack that provides of current rectifying and wave filtering circuit 2, by diode D5, being defeated by electrochemical capacitor C3 again charges, the voltage of now diode D5 output is described two parts voltage sum, two parts voltage sum is greater than the input voltage of current rectifying and wave filtering circuit 2.Therefore, booster circuit 3 has reached the object of boosting.The magnitude of voltage boosting is determined by three portions of electronics elements: the one, and biasing resistor R13, the 2nd, peak current detection resistance R 15 and resistance R 16, three, constant voltage resistance R a; By described three portions of electronics component synthesis, controlled, make output voltage constant in design load.Burning voltage after booster circuit 3 boosts offers step-down constant-current circuit 4, and step-down constant-current circuit 4, for LED module 5 provides constant current, makes LED luminous.
Embodiment bis-, as shown in Figure 4, a kind of LED spotlight circuit that can compatible electronic transformer described in the present embodiment, with embodiment mono-relatively, difference is, described LED module 5 is in series with six string LED.This compares with embodiment mono-, is more conducive to improve the optical efficiency of complete machine, makes the power savings advantages of LED more obvious; Its lighting effect is better, and can reach more energy-conservation object.The operation principle of other structure of the present embodiment and annexation thereof, booster circuit 3 is all identical with embodiment mono-, does not repeat them here.
The above is only two preferred embodiments of the present invention; in addition; the present invention can also realize by alternate manner, and the equivalence of doing according to structure, feature and principle described in patent claim of the present invention therefore all changes or modifies, and is all included in the protection range of patent application of the present invention.
Claims (2)
- One kind can compatible electronic transformer LED spotlight circuit, comprise high-frequency electronic transformer circuit (1), current rectifying and wave filtering circuit (2), step-down constant-current circuit (4) and LED module (5), it is characterized in that, also comprise booster circuit (3), described high-frequency electronic transformer circuit (1), current rectifying and wave filtering circuit (2), booster circuit (3), step-down constant-current circuit (4) and LED module (5) are connected successively; Described booster circuit (3) comprises integrated circuit U1, electrochemical capacitor C11, triode Q2, diode D4, diode D5, inductance L 3, resistance R 4, HF switch pipe Q3, biasing resistor R13, resistance R 14, resistance R 16, resistance R 17 and electrochemical capacitor C3; The output of current rectifying and wave filtering circuit (2) is connected with inductance L 3 one end, and the drain electrode of the positive pole of diode D5, HF switch pipe Q3 is all connected with the other end of inductance L 3; The positive pole of the positive pole of diode D4, electrochemical capacitor C3 is all connected with the negative pole of diode D5; The minus earth of electrochemical capacitor C3; Resistance R 16 one end, resistance R 17 one end are all connected with the source electrode of HF switch pipe Q3, resistance R 16 other ends, the equal ground connection of resistance R 17 other end; The grid of HF switch pipe Q3 is connected with resistance R 14 one end, and 5 pins of resistance R 14 other ends and integrated circuit U1 are connected; The collector electrode of resistance R 4 one end, triode Q2 is all connected with the negative pole of diode D4, resistance R 4 other ends are connected with the base stage of triode Q2,6 pins of the positive pole of electrochemical capacitor C11, high-frequency electronic transformer, biasing resistor R13 one end are all connected with the emitter of triode Q2, and 4 pins of high-frequency electronic transformer are connected with the biasing resistor R13 other end; The minus earth of electrochemical capacitor C11; Described booster circuit (3) also comprises voltage stabilizing didoe D11, and the base stage of described triode Q2, resistance R 4 other ends are all connected with the negative pole of voltage stabilizing didoe D11, ground connection again after the positive pole of the negative pole of described electrochemical capacitor C11 and voltage stabilizing didoe D11 is connected; Described booster circuit (3) also comprises resistance R 12 and capacitor C 13,8 pins of capacitor C 13 one end, integrated circuit U1 are all connected with resistance R 12 one end, and the emitter of 6 pins of integrated circuit U1, the positive pole of electrochemical capacitor C11, triode Q2, biasing resistor R13 one end are all connected with resistance R 12 other ends; Capacitor C 13 other end ground connection; Described booster circuit (3) also comprises constant voltage resistance R a, the negative pole of the positive pole of the positive pole of diode D4, electrochemical capacitor C3, diode D5 is all connected with one end of constant voltage resistance R a, and the source electrode of peak current detection resistance R 15 one end, resistance R 16 one end, resistance R 17 one end, HF switch pipe Q3 is all connected with the other end of constant voltage resistance R a;Described booster circuit (3) also comprises peak current detection resistance R 15, the source electrode of described HF switch pipe Q3, resistance R 16 one end, resistance R 17 one end are all connected with peak current detection resistance R 15 one end, and 4 pins of integrated circuit U1, the biasing resistor R13 other end are all connected with peak current detection resistance R 15 other ends;Described booster circuit (3) also comprises overvoltage protection diode D12, and the positive pole of diode D4 is connected with one end of overvoltage protection diode D12, and the source electrode of HF switch pipe Q3 is connected with the other end of overvoltage protection diode D12.
- 2. a kind of LED spotlight circuit that can compatible electronic transformer according to claim 1, is characterized in that: described LED module (5) is in series with a plurality of LED or is parallel with a plurality of LED.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210409347.2A CN102858076B (en) | 2012-10-24 | 2012-10-24 | LED (Light Emitting Diode) spotlight circuit compatible with electronic transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210409347.2A CN102858076B (en) | 2012-10-24 | 2012-10-24 | LED (Light Emitting Diode) spotlight circuit compatible with electronic transformer |
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| CN102858076A CN102858076A (en) | 2013-01-02 |
| CN102858076B true CN102858076B (en) | 2014-09-10 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104080224A (en) * | 2013-03-25 | 2014-10-01 | 深圳市海洋王照明工程有限公司 | Power supply circuit and lamp |
| CN103200747A (en) * | 2013-04-22 | 2013-07-10 | 深圳市裕富照明有限公司 | Dimmable LED (light-emitting diode) power supply |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100194296A1 (en) * | 2009-02-05 | 2010-08-05 | Myung Koo Park | Led fluorescent lamp |
| WO2012057369A1 (en) * | 2010-10-28 | 2012-05-03 | シチズンホールディングス株式会社 | Led lighting circuit, led illuminating device, and socket for led illuminating unit |
| CN202425106U (en) * | 2011-11-28 | 2012-09-05 | 东莞市福地电子材料有限公司 | LED (light-emitting diode) high-voltage power supply |
| CN203027530U (en) * | 2012-10-24 | 2013-06-26 | 东莞健达照明有限公司 | LED spotlight circuit compatible with electronic transformer |
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- 2012-10-24 CN CN201210409347.2A patent/CN102858076B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100194296A1 (en) * | 2009-02-05 | 2010-08-05 | Myung Koo Park | Led fluorescent lamp |
| WO2012057369A1 (en) * | 2010-10-28 | 2012-05-03 | シチズンホールディングス株式会社 | Led lighting circuit, led illuminating device, and socket for led illuminating unit |
| CN202425106U (en) * | 2011-11-28 | 2012-09-05 | 东莞市福地电子材料有限公司 | LED (light-emitting diode) high-voltage power supply |
| CN203027530U (en) * | 2012-10-24 | 2013-06-26 | 东莞健达照明有限公司 | LED spotlight circuit compatible with electronic transformer |
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