CN202679728U

CN202679728U - Non-isolated critical self-excited type LED driving power supply

Info

Publication number: CN202679728U
Application number: CN 201220278243
Authority: CN
Inventors: 伍涌
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-06-12
Filing date: 2012-06-12
Publication date: 2013-01-16
Anticipated expiration: 2022-06-12

Abstract

The utility model discloses a non-isolated critical self-excited type LED (Light Emitting Diode) driving power supply, comprising an input end, a starting and oscillating module, a protection module, a positive feedback and current equalizing module, and an output end; wherein the input end is connected with the starting and oscillating module, the starting and oscillating module is connected with the output end through the positive feedback and current equalizing module, the protection module is connected between the starting and oscillating module and the positive feedback and current equalizing module. By adopting a discrete component design, the non-isolated critical self-excited type LED driving power supply of the utility model has a simple structure and a low cost; the positive feedback and current equalizing module enables the non-isolated critical self-excited type LED driving power supply to be used for driving different LED loads, thus a good adaptability is achieved; in addition, the non-isolated critical self-excited type LED driving power supply of the utility model also has the advantages of low heat radiation, easy debugging and detection, and so on, thus the non-isolated critical self-excited type LED driving power supply has a good application prospect.

Description

The critical auto-excitation type LED driving power of a kind of non-isolation

Technical field

The utility model relates to the LED lighting technical field, particularly relates to the critical auto-excitation type LED driving power of a kind of non-isolation.

Background technology

In the today of advocating green energy conservation, coming into our life as the LED luminous product of lighting field future developing trend, but several factors has hindered popularizing fast of it, and one of them major reason lacks the driving power cheap, that performance is outstanding exactly.

The situation of existing LED power supply is as follows: cheap " power supply " generally adopts the resistance-capacitance depressurization current limliting, and this way has been obliterated the power savings advantages of LED fully, and light intensity can change with the variation of input voltage; The small-power power that is widely used in bulb lamp etc. generally adopts its to swash inverse-excitation type structure, although the application of former limit feedback technique has reduced the manufacturing cost of power supply to a certain extent, it is larger that not high efficient still makes power supply itself generate heat; Widely applied the non-insulating power supply of independent-excited on the strip light such as T8, efficient is pretty good, but cost is higher; High-power lamp generally adopts ortho-exciting electric source, and manufacturing cost is high; In addition, above-mentioned several power supply the Development and Production link all can't accomplish simultaneously following some: the design that stylizes of the single-mode of low development cost; Power output is from very little to the very large same circuit structure that all adopts; Device parameters is constant or only do very little change under different application.

In view of problem and the defective thereof of above-mentioned existence, be necessary existing LED driving power is proposed new improvement.

The utility model content

For the problems referred to above, the utility model provides the novel non-isolation low, simple in structure and highly versatile of a kind of cost critical auto-excitation type LED driving power.

The utility model is that the technical scheme that its technical problem of solution adopts is:

The critical auto-excitation type LED driving power of a kind of non-isolation is characterized in that comprising:

Input is used for initial direct current input;

Start and the concussion module, the electric current that receives input is used for the startup of self circuit, and provides the concussion electric current to subsequent module;

Protection module is for the protection of starting and the concussion module;

Positive feedback and current-sharing module receive described concussion electric current and produce concussion, and the equilibrium of positive feedback voltage being provided and guaranteeing output current for described startup and concussion module;

And output, be used for obtaining required direct current;

Described input links to each other with startup and concussion module, and described startup and concussion module link to each other with output by positive feedback and current-sharing module, and described protection module is connected between startup and concussion module and positive feedback and the current-sharing module.

As further improvement of these options; described startup and concussion module comprise resistance R 1; R2; R3 and R4; switching tube Q1; triode Q2; capacitor C 1; described resistance R 1 one ends connect the drain electrode of input (1) DC positive pole and switching tube Q1; grid and the resistance R 2 of its other end connecting valve pipe Q1; the other end of described resistance R 2 links to each other with the collector electrode of triode Q2; the emitter of described triode Q2 links to each other with protection module; its base stage is contact resistance R3 and capacitor C 1 respectively, links to each other with the other end of capacitor C 1 by resistance R 4 after the source electrode of described switching tube Q1 links to each other with the other end of resistance R 3.

Further; described positive feedback and current-sharing module comprise diode D3; resistance R 5; R6; capacitor C 2; voltage-stabiliser tube D4 and transformer T1; the negative pole of described diode D3 be connected to protection module after capacitor C 2 one ends link to each other; contact resistance R5 after the positive pole of diode D3 links to each other with capacitor C 2 other ends; the other end of resistance R 5 links to each other with voltage-stabiliser tube D4 negative pole with an end of T1 level of transformer respectively; described voltage-stabiliser tube D4 is anodal to link to each other with the base stage of described triode Q2 by resistance R 6; the other end of T1 level of described transformer is connected to and starts and the concussion module, and the elementary and output of transformer T1 links to each other.

In addition, described protection module is voltage-stabiliser tube D2, common ground after the positive pole of described voltage-stabiliser tube D2 links to each other with the emitter of triode Q2, and its negative pole links to each other with the negative pole of diode D3.

The beneficial effects of the utility model are: the utility model is as the critical auto-excitation type LED driving power of a kind of non-isolation; comprise input; start and the concussion module; protection module; positive feedback and current-sharing module and output; input links to each other with startup and concussion module; start and shake module and link to each other with output by positive feedback and current-sharing module; described protection module is connected between startup and concussion module and positive feedback and the current-sharing module; owing to all adopting the discrete component design; the utility model is simple in structure and cost is low; positive feedback and current-sharing module can drive different LED loads so that the utility model can be used in; its adaptability is good; it is little that the utility model also has heating in addition; debugging detects the advantages such as easy, therefore possesses good application prospect.

Description of drawings

The utility model is described in further detail below in conjunction with drawings and Examples:

Fig. 1 is the utility model circuit principle structure schematic diagram;

Fig. 2 is another modified model example structure schematic diagram of the utility model.

Embodiment

With reference to Fig. 1, the critical auto-excitation type LED driving power of a kind of non-isolation comprises input 1, is used for initial direct current input; Start and concussion module 2, the electric current that receives input 1 is used for the startup of self circuit, and provides the concussion electric current to subsequent module; Protection module 3 is for the protection of starting and concussion module 2; Positive feedback and current-sharing module 4 receive described concussion electric current and produce concussion, and the equilibrium of positive feedback voltage being provided and guaranteeing output current for described startup and concussion module 2; And output 5, be used for obtaining required direct current; Described input 1 links to each other with startup and concussion module 2; described startup and concussion module 2 link to each other with output 5 by positive feedback and current-sharing module 4; described protection module 3 is connected between startup and concussion module 2 and positive feedback and the current-sharing module 4; start and shake module 2 and comprise resistance R 1; R2; R3 and R4; switching tube Q1; triode Q2; capacitor C 1; described resistance R 1 one ends connect the DC positive pole of input 1 and the drain electrode of switching tube Q1; grid and the resistance R 2 of its other end connecting valve pipe Q1; the other end of described resistance R 2 links to each other with the collector electrode of triode Q2; the emitter of described triode Q2 links to each other with protection module 3; its base stage is contact resistance R3 and capacitor C 1 respectively; after linking to each other with the other end of resistance R 3, the source electrode of described switching tube Q1 links to each other with the other end of capacitor C 1 by resistance R 4; positive feedback and current-sharing module 4 comprise diode D3; resistance R 5; R6; capacitor C 2; voltage-stabiliser tube D4 and transformer T1; the negative pole of described diode D3 be connected to protection module 3 after capacitor C 2 one ends link to each other; contact resistance R5 after the positive pole of diode D3 links to each other with capacitor C 2 other ends; the other end of resistance R 5 links to each other with voltage-stabiliser tube D4 negative pole with an end of T1 level of transformer respectively; described voltage-stabiliser tube D4 is anodal to link to each other with the base stage of described triode Q2 by resistance R 6; the other end of T1 level of described transformer is connected to and starts and concussion module 2; elementary and the output 5 of transformer T1 links to each other; protection module 3 is voltage-stabiliser tube D2; common ground after the positive pole of described voltage-stabiliser tube D2 links to each other with the emitter of triode Q2, its negative pole links to each other with the negative pole of diode D3.

Particularly, according to Fig. 1, this circuit all is comprised of discrete component, mainly comprises five major parts, and the element function of each several part is as follows, input: electrochemical capacitor CD1 is used for input filter; Start and concussion: Q1 is switching tube, and the metal-oxide-semiconductor that is designated as among the figure also can be triode or Darlington etc., Q2 is for turn-offing the control triode, and R1 is starting resistance, and R2 is Q1 grid current-limiting resistance, R3 is Q2 base stage current-limiting resistance, and R4 is the load current-limiting resistance, and C1 is anti-tampering electric capacity; Protection: D2 is be used to the voltage-stabiliser tube that prevents the Q1 gate breakdown; The sub-combinations thereof of positive feedback and current-sharing: C2, D3, R5 and T1 provides positive feedback voltage for the grid of Q1, and D4 and R6 combination is used for offsetting input voltage and positive feedback change in voltage and causes the switching tube turn-off time to change and the output current that causes changes; The elementary load output current of giving of output: T1, CD2 is used for filtering, the fly-wheel diode when D1 is the Q1 shutoff.Its specific works process is as follows: the startup stage: behind the power connection, electric current makes the Q1 conducting through the drain junctions capacitor charging of R1 to Q1, and On current is elementary by R4, T1, the OUT+ powering load, and electric current forms the loop by OUT-again; At this moment, the elementary current potential of T1 be 1 pin just, 4 pin are negative, secondary induction be 5 pin just, 8 pin are negative, 5 pin form positive feedback by R5, C2, D3, R2 to the Q1 grid, make Q1 saturated fast; The saturation conduction stage: behind the Q1 saturation conduction, flow through the elementary electric current of T1 and constantly rise, the voltage at R4 two ends also constantly rises, Q2 conducting when the voltage at R4 two ends rises to the conducting voltage of Q2 base stage, the Q1 grid voltage reduces, Q1 withdraws from saturated, and the electric current that flows through the Q1 source electrode begins to descend, and makes the elementary current potential of T1 reverse, and then cause the T1 secondary voltage oppositely (namely 5 pin bear, 8 pin just), Q1 grid voltage under positive feedback effect was dragged down by moment, Q1 cut-off, D1 conducting; After inductive discharge stage: the Q1 cut-off, the energy of the elementary storage of T1 begins to discharge to load, and the electric current of release is progressively reduced by the maximum of Q1 cut-off moment; When electric current is reduced to 0, owing to still having the residual amount of energy that can not discharge fully on a small quantity, T1 just to produce the magnetic concussion, and then the voltage reversal of T1, make the 5 pin output positive voltage of T1 cause the Q1 conducting, saturated rapidly under the effect of positive feedback after the Q1 conducting, thus begin a new concussion cycle.

Fig. 2 is another modified model example structure schematic diagram, and circuit structure is basic identical.

Above better enforcement of the present utility model is specified; certainly; the utility model can also adopt form different from the embodiment described above; and close field; these do not consist of any restriction to present embodiment; those of ordinary skill in the art should belong in the protection range of the present utility model the conversion that is equal to of doing under the prerequisite of the utility model spirit or corresponding the change.

Claims

1. critical auto-excitation type LED driving power of non-isolation is characterized in that comprising:

Input (1) is used for initial direct current input;

Start and concussion module (2), the electric current that receives input (1) is used for the startup of self circuit, and provides the concussion electric current to subsequent module;

Protection module (3) is for the protection of starting and concussion module (2);

Positive feedback and current-sharing module (4) receive described concussion electric current and produce concussion, and the equilibrium of positive feedback voltage being provided and guaranteeing output current for described startup and concussion module (2);

And output (5), be used for obtaining required direct current;

Described input (1) links to each other with startup and concussion module (2); described startup and concussion module (2) link to each other with output (5) by positive feedback and current-sharing module (4), and described protection module (3) is connected between startup and concussion module (2) and positive feedback and the current-sharing module (4).

2. the critical auto-excitation type LED driving power of a kind of non-isolation according to claim 1; it is characterized in that: described startup and concussion module (2) comprise resistance R 1; R2; R3 and R4; switching tube Q1; triode Q2; capacitor C 1; described resistance R 1 one ends connect the drain electrode of input (1) DC positive pole and switching tube Q1; grid and the resistance R 2 of its other end connecting valve pipe Q1; the other end of described resistance R 2 links to each other with the collector electrode of triode Q2; the emitter of described triode Q2 links to each other with protection module (3); its base stage is contact resistance R3 and capacitor C 1 respectively, links to each other with the other end of capacitor C 1 by resistance R 4 after the source electrode of described switching tube Q1 links to each other with the other end of resistance R 3.

3. the critical auto-excitation type LED driving power of a kind of non-isolation according to claim 1; it is characterized in that: described positive feedback and current-sharing module (4) comprise diode D3; resistance R 5; R6; capacitor C 2; voltage-stabiliser tube D4 and transformer T1; the negative pole of described diode D3 be connected to protection module (3) after capacitor C 2 one ends link to each other; contact resistance R5 after the positive pole of diode D3 links to each other with capacitor C 2 other ends; the other end of resistance R 5 links to each other with voltage-stabiliser tube D4 negative pole with an end of T1 level of transformer respectively; described voltage-stabiliser tube D4 is anodal to link to each other with the base stage of described triode Q2 by resistance R 6; the other end of T1 level of described transformer is connected to and starts and concussion module (2), and the elementary and output (5) of transformer T1 links to each other.

4. the critical auto-excitation type LED driving power of a kind of non-isolation according to claim 1; it is characterized in that: described protection module (3) is voltage-stabiliser tube D2; common ground after the positive pole of described voltage-stabiliser tube D2 links to each other with the emitter of triode Q2, its negative pole links to each other with the negative pole of diode D3.