CN203027530U

CN203027530U - LED spotlight circuit compatible with electronic transformer

Info

Publication number: CN203027530U
Application number: CN 201220547335
Authority: CN
Inventors: 安庆照
Original assignee: KEE TAT LIGHTING HOLDINGS CO Ltd
Current assignee: KEE TAT LIGHTING HOLDINGS CO Ltd
Priority date: 2012-10-24
Filing date: 2012-10-24
Publication date: 2013-06-26
Anticipated expiration: 2022-10-24

Abstract

The utility model provides an LED spotlight circuit compatible with an electronic transformer. The LED spotlight circuit comprises a high frequency transformer circuit, a rectifier and filter circuit, a boost circuit, a step-down constant current circuit and an LED module. The 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 switch tube Q3, a bias resistor R13, a resistor R14 and an electrolytic capacitor C3. Both an anode of the diode D5 and a collector electrode of the high frequency switch tube Q3 are connected with another end of the inductor L3. Both the anode of the diode D4 and the anode of the electrolytic capacitor C3 are connected with the cathode of the diode D5. Both one end of the resistor R4 and a collector electrode of the triode Q2 are connected with a cathode of the diode D4. The anode of the electrolytic capacitor C11, a pin 6 of the integrated circuit U1 and one end of the bias resistor R13 are connected with an emitter of the triode Q2. The LED spotlight circuit is compatible with the electronic transformer.

Description

But a kind of LED spotlight circuit of compatible electronic transformer

Technical field

The utility model relates to the LED drive circuit technical field, but particularly relates to a kind of LED spotlight circuit of 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 uses in a large number in dissimilar MR16 type Lamp cup.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, be output as the high frequency ac signal of 12V left and right due to electronic transformer, due to this kind topological circuit at four rectifier diodes (that is: diode D1, diode D2, diode D6 and diode D8) back is provided with an electrochemical capacitor C that capacitance is larger, 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 to work, intermittent output appears, practical manifestation phenomenon out is 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 that connects approached or surpasses 12V, the LED lamp can not normally be lighted.Constantly improve along with society constantly develops with science and technology, the LED shot-light is also constantly updating, and people have higher requirement aspect compatible at its high-frequency electronic transformer drive circuit to the LED shot-light.Therefore, but people wish that urgently a kind of LED spotlight circuit of compatible electronic transformer comes out.

Summary of the invention

technical problem to be solved in the utility model is: overcome that the high-frequency electronic transformer drive circuit of prior art exists can not the compatible electronic transformer defective, satisfy people's hope and the market demand of LED shot-light, but provide a kind of LED spotlight circuit of compatible electronic transformer, but the electronic transformer that the LED spotlight circuit of this compatible electronic transformer fully can compatible prior art, after in the LED shot-light, circuit described in the utility model being installed, the LED shot-light is in lighting process, LED scintillation can not occur, people can obtain best lighting effect, and can reach energy-conservation purpose.

The technical scheme that its technical problem that solves the utility model adopts is: but a kind of LED spotlight circuit of compatible electronic transformer, comprise high-frequency electronic transformer circuit, current rectifying and wave filtering circuit, step-down constant-current circuit and LED module, but the LED spotlight circuit of this 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 are connected with the LED module and are connected; 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 an end and is connected with inductance L, the drain electrode of the positive pole of diode D5, HF switch pipe Q3 all is connected with the other end of inductance L 3; The anodal of the positive pole of diode D4, electrochemical capacitor C3 all is connected with the negative pole of diode D5; The minus earth of electrochemical capacitor C3; Resistance R 16 1 ends, resistance R 17 1 ends all are connected with the source electrode of HF switch pipe Q3, resistance R 16 other ends, the resistance R 17 equal ground connection of the other end; The grid of HF switch pipe Q3 is connected an end and is connected with resistance R, resistance R 14 other ends are connected 5 pins and are connected with integrated circuit U1; The collector electrode of resistance R 4 one ends, triode Q2 all is connected with the negative pole of diode D4, resistance R 4 other ends are connected base stage and are connected with triode Q2,6 pins of the positive pole of electrochemical capacitor C11, integrated circuit U1, biasing resistor R13 one end all are 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 also comprises voltage stabilizing didoe D11, and the base stage of described triode Q2, resistance R 4 other ends all are connected with the negative pole of voltage stabilizing didoe D11, the negative pole of described electrochemical capacitor C11 be connected with voltage stabilizing didoe D11 positive pole connect after ground connection again; Described booster circuit also comprises resistance R 12 and capacitor C 13,8 pins of capacitor C 13 1 ends, integrated circuit U1 all are connected with resistance R 12 1 ends, and the emitter of 6 pins of integrated circuit U1, the positive pole of electrochemical capacitor C11, triode Q2, biasing resistor R13 one end all are 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 all is connected with the end of constant voltage resistance R a, and the source electrode of peak current detection resistance R 15 1 ends, resistance R 16 1 ends, resistance R 17 1 ends, HF switch pipe Q3 all is 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 1 ends, resistance R 17 1 ends all are connected with peak current detection resistance R 15 1 ends, and 4 pins of integrated circuit U1, the biasing resistor R13 other end all are 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 the 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 beneficial effects of the utility model are: but 1, the LED spotlight circuit of this compatible electronic transformer fully can compatible prior art electronic transformer, after in the LED shot-light, circuit described in the utility model being installed, the LED shot-light is in lighting process, LED scintillation can not occur, people can obtain best lighting effect, and can reach energy-conservation purpose.2, due to the utility model fully can compatible prior art electronic transformer, described, LED shot-light user can join high-frequency electronic transformer according to the needs of oneself.3, when the drive circuit in the old Halogen lamp LED of use the utility model replacement, can dismantle drive circuit in old Halogen lamp LED, get final product and directly topological circuit Lamp cup of the present utility model is installed into, thereby can save the larger installation of number and demolition works expense.4, owing to the utlity model has the High Power Factor value, so, install and when using the utility model in enormous quantities, to the interference of electrical network seldom, electrical network is very helpful.5, the utility model type 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, can suitably increase the LED number in LED module of the present utility model, the optical efficiency that this is conducive to improve complete machine makes the power savings advantages of LED more obvious.7, the utility model is reasonable in design, owing to the utlity model has above-mentioned advantage, so, include LED shot-light of the present utility model and have wide market prospects.

Description of drawings

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 utility model;

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 utility model;

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---the step-down constant-current circuit; 5---the LED module.

Embodiment

Below in conjunction with the drawings and specific embodiments, the utility model being described in further detail, is not that practical range of the present utility model is confined to this.

Embodiment one, as shown in Figures 2 and 3, but the LED spotlight circuit of the described a kind of compatible electronic transformer of 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, but the LED spotlight circuit that is somebody's turn to do the compatible electronic transformer also comprises booster circuit 3, and described high-frequency electronic transformer circuit 1, current rectifying and wave filtering circuit 2, booster circuit 3, step-down constant-current circuit 4 are connected with the LED module and are connected; 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 an end and is connected with inductance L, the drain electrode of the positive pole of diode D5, HF switch pipe Q3 all is connected with the other end of inductance L 3; The anodal of the positive pole of diode D4, electrochemical capacitor C3 all is connected with the negative pole of diode D5; The minus earth of electrochemical capacitor C3; Resistance R 16 1 ends, resistance R 17 1 ends all are connected with the source electrode of HF switch pipe Q3, resistance R 16 other ends, the resistance R 17 equal ground connection of the other end; The grid of HF switch pipe Q3 is connected an end and is connected with resistance R, resistance R 14 other ends are connected 5 pins and are connected with integrated circuit U1; The collector electrode of resistance R 4 one ends, triode Q2 all is connected with the negative pole of diode D4, resistance R 4 other ends are connected base stage and are connected with triode Q2,6 pins of the positive pole of electrochemical capacitor C11, integrated circuit U1, biasing resistor R13 one end all are 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 all are connected with the negative pole of voltage stabilizing didoe D11, the negative pole of described electrochemical capacitor C11 be connected with voltage stabilizing didoe D11 positive pole connect after ground connection again; Described booster circuit 3 also comprises resistance R 12 and capacitor C 13,8 pins of capacitor C 13 1 ends, integrated circuit U1 all are connected with resistance R 12 1 ends, and the emitter of 6 pins of integrated circuit U1, the positive pole of electrochemical capacitor C11, triode Q2, biasing resistor R13 one end all are 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 all is connected with the end of constant voltage resistance R a, and the source electrode of peak current detection resistance R 15 1 ends, resistance R 16 1 ends, resistance R 17 1 ends, HF switch pipe Q3 all is 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 1 ends, resistance R 17 1 ends all are connected with peak current detection resistance R 15 1 ends, and 4 pins of integrated circuit U1, the biasing resistor R13 other end all are 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 the 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 an end and are connected with capacitor C, 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, an end after the anodal parallel connection of resistance R 18 1 ends, capacitor C 17 1 ends, electrochemical capacitor C3 connects the negative pole of diode D5, resistance R 18 other ends are connected an end and are connected with capacitor C, 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.But the LED spotlight circuit of the described a kind of compatible electronic transformer of the present embodiment has adopted the two-stage body frame structure of the rear step-down of first boosting, and the framework that boosts is booster circuit 3, and the 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, integrated circuit U1 starts 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, this moment, inductance L 3 will be recharged, when 4 pins of integrated circuit U1 reach the peak current threshold values, the 5 pin output low levels of integrated circuit U1, HF switch pipe Q3 turn-offs, inductance L 3 chargings are completed, at this moment, because the electromotive force on 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, be defeated by electrochemical capacitor C3 charging by diode D5 again, this moment, the voltage of diode D5 output was 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 purpose of boosting.The magnitude of voltage that boosts 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; Controlled by described three portions of electronics component synthesis, 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 makes LED luminous for LED module 5 provides constant current.

Embodiment two, as shown in Figure 4, but the LED spotlight circuit of the described a kind of compatible electronic transformer of the present embodiment, with embodiment one relatively, difference is, described LED module 5 is in series with six string LED.This compares with embodiment one, more is 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 purpose.The operation principle of other structure of the present embodiment and annexation thereof, booster circuit 3 is all identical with embodiment one, does not repeat them here.

The above is only two preferred embodiments of the present utility model; in addition; the utility model can also be realized by alternate manner; therefore all equivalences of doing according to the described structure of the utility model patent claim, feature and principle change or modify, and all are included in the protection range of the utility model patent application.

Claims

1. but the LED spotlight circuit of a compatible electronic transformer, 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) are connected 5 with the LED module) connect 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 an end and is connected with inductance L, the drain electrode of the positive pole of diode D5, HF switch pipe Q3 all is connected with the other end of inductance L 3; The anodal of the positive pole of diode D4, electrochemical capacitor C3 all is connected with the negative pole of diode D5; The minus earth of electrochemical capacitor C3; Resistance R 16 1 ends, resistance R 17 1 ends all are connected with the source electrode of HF switch pipe Q3, resistance R 16 other ends, the resistance R 17 equal ground connection of the other end; The grid of HF switch pipe Q3 is connected an end and is connected with resistance R, resistance R 14 other ends are connected 5 pins and are connected with integrated circuit U1; The collector electrode of resistance R 4 one ends, triode Q2 all is connected with the negative pole of diode D4, resistance R 4 other ends are connected base stage and are connected with triode Q2,6 pins of the positive pole of electrochemical capacitor C11, integrated circuit U1, biasing resistor R13 one end all are 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 all are connected with the negative pole of voltage stabilizing didoe D11, the negative pole of described electrochemical capacitor C11 be connected with voltage stabilizing didoe D11 positive pole connect after ground connection again; Described booster circuit (3) also comprises resistance R 12 and capacitor C 13,8 pins of capacitor C 13 1 ends, integrated circuit U1 all are connected with resistance R 12 1 ends, and the emitter of 6 pins of integrated circuit U1, the positive pole of electrochemical capacitor C11, triode Q2, biasing resistor R13 one end all are 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 all is connected with the end of constant voltage resistance R a, and the source electrode of peak current detection resistance R 15 1 ends, resistance R 16 1 ends, resistance R 17 1 ends, HF switch pipe Q3 all is connected with the other end of constant voltage resistance R a.

2. but the LED spotlight circuit of a kind of compatible electronic transformer according to claim 1, it is characterized in that: described booster circuit (3) also comprises peak current detection resistance R 15, the source electrode of described HF switch pipe Q3, resistance R 16 1 ends, resistance R 17 1 ends all are connected with peak current detection resistance R 15 1 ends, and 4 pins of integrated circuit U1, the biasing resistor R13 other end all are connected with peak current detection resistance R 15 other ends.

3. but the LED spotlight circuit of a kind of compatible electronic transformer according to claim 1; it is characterized in that: described booster circuit (3) also comprises overvoltage protection diode D12; the positive pole of diode D4 is connected with the 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.

4. but the LED spotlight circuit of a kind of compatible electronic transformer according to claim 1, it is characterized in that: described LED module (5) is in series with a plurality of LED or is parallel with a plurality of LED.