CN201568795U

CN201568795U - LED energy saving lamp

Info

Publication number: CN201568795U
Application number: CN200920202715XU
Authority: CN
Inventors: 高忠康
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-12-14
Filing date: 2009-12-14
Publication date: 2010-09-01
Anticipated expiration: 2019-12-14

Abstract

The utility model discloses a LED energy saving lamp, which includes a rectification circuit and a LED series circuit formed by connecting a plurality of LED in series; the LED series circuit is also connected with a constant current circuit or a current-limiting circuit in series; the LED series circuit is divided into a plurality of LED branchs; each LED branch is formed by connecting a plurality of LED in series; each LED branch is respectively connected with one voltage stabilizing circuit in parallel. When the working current of the LED is not stable or overhigh, the reasonable working current of the LED is regulated through the constant current (current-limiting) circuit to lead the LED to work in the reasonable working current all the time to ensure normal luminescence and effectively improve the performance of the LED energy saving lamp and the service life of the LED; when a certain group of LED is damaged, as each voltage stabilizing circuit is connected into a LED lighting circuit in series, the whole LED series circuit can still work, and can not affect the LED energy saving lamp to work normally due to the failure influence of a certain group of LED.

Description

A kind of LED electricity-saving lamp

Technical field

The utility model relates to a kind of LED electricity-saving lamp, relates in particular to the LED energy-saving lamp circuit, be applicable to civilian, road, bridge, tunnel and industrial lighting.

Background technology

The LED electricity-saving lamp is a kind of lighting of environmental protection and energy saving, mainly comprises the LED series circuit that is composed in series by a plurality of LED electronic components (light emitting diode), the dc source of LED series circuit operate as normal and the mu balanced circuit in parallel with the LED series circuit are provided.Make LED normally luminous, must provide stable voltage and stable electric current to LED, a power is the LED of 0.06W, and operating voltage 3.0-3.2V need be provided, the dc source about operating current 18-20mA, and the working environment of proper temperature.If the operating voltage, the operating current that provide are higher than LED normal working voltage, electric current, LED can shorten service life, even is burnt.If the operating voltage, the operating current that provide are lower than LED normal working voltage, electric current, do not reach normal power, influence normal illumination.But in LED series circuit when work,, because heating all can influence normal working voltage and the electric current of LED when the fluctuation of dc source and LED work, LED heating back internal resistance diminishes, and electric current can raise, if current stabilization in addition not, LED also can premature aging even burnt out.Therefore keeping stable operating current of LED and operating voltage is one of key issue of performance LED electricity-saving lamp effect.And voltage stabilizing, the current stabilization circuit cost of existing LED are higher, luminous instability, and power factor is low, and the circuit structure complexity limits the market competitiveness of LED electricity-saving lamp greatly, restricts its development and popularizes.

Summary of the invention

Technical problem to be solved in the utility model provides and a kind ofly can keep LED steady operation electric current and voltage, and circuit structure is simple, safe and reliable LED energy-saving lamp circuit.

For solving the problems of the technologies described above, the technical solution of the utility model is: a kind of LED electricity-saving lamp comprises rectification circuit and the LED series circuit that is composed in series by a plurality of LED, also connect in the described LED series circuit current stabilization circuit or current-limiting circuit.

The further technical scheme of the utility model is: described LED series circuit is divided into several LED branch roads, and each LED props up several LED of route and is in series, each LED branch road mu balanced circuit respectively in parallel.

The beneficial effects of the utility model are: 1, because connect in the LED series circuit current stabilization circuit or current-limiting circuit again, when the LED operating current is unstable or too high, regulate the reasonable operating current of LED by current stabilization (current limliting) circuit, LED is reasonably being worked in the operating current all the time, guarantee normally luminously, effectively improve the performance of LED electricity-saving lamp and the service life of LED.2, the LED series circuit is carried out segmentation and connects mu balanced circuit, when a certain group of LED damages, because each mu balanced circuit series connection is arranged in the LED lighting circuit, thereby guarantees whole LED series circuit endure, can not organize the operate as normal of the fault effects LED electricity-saving lamp of LED because of certain.

The utility model is described in further detail below in conjunction with the drawings and the specific embodiments.

Description of drawings

Fig. 1 is the circuit block diagram of the utility model embodiment;

Fig. 2 is the circuit theory diagrams of first embodiment of the utility model current stabilization circuit;

Fig. 3 is the circuit theory diagrams of second embodiment of the utility model current stabilization circuit.

The specific embodiment

As Fig. 1, Fig. 2, shown in Figure 3, embodiment of the present utility model is a kind of LED energy-saving lamp circuit with voltage stabilization and current stabilization function, comprise rectification circuit, filter circuit, LED series circuit, current stabilization circuit and mu balanced circuit, current stabilization circuit is connected in the work loop of LED series circuit.

Rectification circuit adopts full-bridge rectifier D81, and wherein two terminals connect alternating current, and alternating current is converted to direct current, and two ends are respectively the positive terminal of output dc voltage and negative pole end (hold) in addition.

Filter circuit can adopt capacitor filtering, choke coil filtering, electronic filtering etc., the filtering AC compounent, and filtered smooth direct current power supply offers the work of LED series circuit.For the low cost design, present embodiment is taked capacitor filtering, comprises filter capacitor C1, and filter capacitor C1 is connected in parallel on the output of full-bridge rectifier D81.

The LED lighting circuit is composed in series by a plurality of LED, LED quantity can be set according to the actual illumination needs, be equally divided into D1-DN LED branch road series connection (annotate: N represents positive integer) together, each branch road D1-DN of present embodiment is composed in series by 8 LED respectively, the mu balanced circuit that each branch road Zener diode DW1-DWN in parallel respectively forms, each Zener diode DW1-DWN both positive and negative polarity successively is connected in series together end to end, is connected in parallel on the positive and negative two ends of whole LED series circuit.Owing to DC voltage along with the fluctuation of alternating current is fluctuateed, offer the LED work of each with it in parallel LED branch road D1-DN after Zener diode DW1-DWN dividing potential drop through being cascaded and the voltage stabilizing respectively, make the LED of each LED branch road obtain stable voltage.The positive terminal of LED series circuit, the positive pole that is the first LED of LED series circuit is connected with the positive terminal of the output dc voltage of rectification circuit D81, obtain direct-current working volts, the negative pole of end the LED of LED series circuit is connected formation LED lighting circuit through the negative pole end of current stabilization circuit and the output dc voltage of rectification circuit D81 (hold).Because the characteristic of Zener diode DW1-DWN serial connection plays the open-circuit-protection effect to LED, promptly when a certain paths of LEDs pipe damage, other paths of LEDs pipe still can operate as normal.

As shown in Figure 2, current stabilization circuit comprises the first triode Q1, the second triode Q2, the 3rd resistance R 3 and the 4th resistance R 4; The colelctor electrode of the first triode Q1 is connected with the base stage of the second triode Q2 and is connected with the positive terminal of rectification circuit D81 output dc voltage; The negative pole of one end of the colelctor electrode of the second triode Q2 and the 3rd resistance R 3 and the last LED of LED series circuit is connected; The emitter stage of the second triode Q2 is connected with the base stage of the first triode Q1 and is connected with an end of the 3rd resistance R 3 other ends and the 4th resistance R 4, and the 4th resistance R 4 other ends are connected with the negative pole end of rectification circuit D81 output dc voltage.For improving the job stability of current stabilization circuit, as shown in Figure 3, the base stage of the described second triode Q2 is by being connected with the positive terminal of rectification circuit output dc voltage with the bleeder circuit that the first Zener diode D82 forms by first resistance R 1; The emitter stage of the described first triode Q1 connects an end of the 5th resistance R 5 and second capacitor C, 2 parallel circuits, the other end of second capacitor C 2 and the 5th resistance R 5 parallel circuits and rectification circuit D81 output dc voltage negative pole end be connected; Described current stabilization circuit comprises that also the colelctor electrode of second resistance R, 2, the second triode Q2 is connected with the negative pole of the last LED of the 3rd resistance R 3 one ends and LED series circuit by second resistance R 2; The colelctor electrode of the described second triode Q2 also connects the second Zener diode D92, the second Zener diode D92 other end and rectification circuit D81 output dc voltage negative pole end be connected.

When the LED heating current increases, cause the electric current between the 3rd resistance R 3 and the 4th resistance R 4 to rise, just the base voltage of the first triode Q1 rises, and rises to the to a certain degree collector and emitter conducting of the first triode Q1; The first triode Q1 conducting causes the base voltage of the second triode Q2 to descend, the base voltage of the second triode Q2 descends, the collector and emitter conducting meeting of the second triode Q2 reduces, just the collector and emitter resistance of the second triode Q2 strengthens, cause current-limiting resistance to strengthen, current-limiting resistance strengthens restriction LED operating current and rises; When the LED electric current is less than normal, electric current between the 3rd resistance R 3 and the 4th resistance R 4 descends, just the base voltage of the first triode Q1 descends, dropping to a certain degree, the collector and emitter of the first triode Q1 ends, the first triode Q1 rises by the base voltage that causes the second triode Q2, the base voltage of the second triode Q2 rises, the collector and emitter conducting of the second triode Q2 increases, just the collector and emitter resistance of the second triode Q2 reduces, cause current-limiting resistance to reduce, the first triode Q1 like this, the work that the second triode Q2 goes round and begins again is limited in rational area of safety operaton to the operating current of LED.

Claims

1. LED electricity-saving lamp comprises rectification circuit and by the LED series circuit that a plurality of LED are composed in series, it is characterized in that: also connect in the described LED series circuit current stabilization circuit or current-limiting circuit.

2. LED electricity-saving lamp according to claim 1 is characterized in that: described current stabilization circuit comprises first triode (Q1), second triode (Q2), the 3rd resistance (R3) and the 4th resistance (R4); The colelctor electrode of first triode (Q1) is connected with the base stage of second triode (Q2) and is connected with the positive terminal of rectification circuit (D81) output dc voltage; The negative pole of one end of the colelctor electrode of second triode (Q2) and the 3rd resistance (R3) and the last LED of LED series circuit is connected; The emitter stage of second triode (Q2) is connected with the base stage of first triode (Q1) and is connected with an end of the 3rd resistance (R3) other end and the 4th resistance (R4), and the 4th resistance (R4) other end is connected with the negative pole end of rectification circuit (D81) output dc voltage.

3. LED electricity-saving lamp according to claim 2, it is characterized in that: described current stabilization circuit also comprises second resistance (R2), and the colelctor electrode of second triode (Q2) is connected with the negative pole of the last LED of the 3rd resistance (R3) end and LED series circuit by second resistance (R2).

4. according to claim 2 or 3 described LED electricity-saving lamps, it is characterized in that: the base stage of described second triode (Q2) is connected with the positive terminal of rectification circuit (D81) output dc voltage by the bleeder circuit of being made up of first resistance (R1) and first Zener diode (D82); The emitter stage of described first triode (Q1) connects an end of the 5th resistance (R5) and second electric capacity (C2) parallel circuit, the other end of second electric capacity (C2) and the 5th resistance (R5) parallel circuit and rectification circuit (D81) output dc voltage negative pole end be connected.

5. according to claim 2 or 3 described LED electricity-saving lamps, it is characterized in that: the colelctor electrode of described second triode (Q2) also connects second Zener diode (D92), second Zener diode (D92) other end and rectification circuit (D81) output dc voltage negative pole end be connected.

6. LED electricity-saving lamp according to claim 4, it is characterized in that: the colelctor electrode of described second triode (Q2) also connects second Zener diode (D92), second Zener diode (D92) other end and rectification circuit (D81) output dc voltage negative pole end be connected.

7. LED electricity-saving lamp according to claim 1 and 2 is characterized in that: described LED series circuit is divided into several LED branch roads, and each LED props up several LED of route and is in series, each LED branch road mu balanced circuit respectively in parallel.

8. LED electricity-saving lamp according to claim 3 is characterized in that: described LED series circuit is divided into several LED branch roads, and each LED props up several LED of route and is in series, each LED branch road mu balanced circuit respectively in parallel.

9. LED electricity-saving lamp according to claim 6 is characterized in that: described LED series circuit is divided into several LED branch roads, and each LED props up several LED of route and is in series, each LED branch road mu balanced circuit respectively in parallel.

10. LED electricity-saving lamp according to claim 9 is characterized in that: described mu balanced circuit comprises Zener diode, and described Zener diode is in parallel with the LED branch road.