CN201781665U

CN201781665U - LED lamp tube protective circuit structure

Info

Publication number: CN201781665U
Application number: CN2010205005672U
Authority: CN
Inventors: 喻北京
Original assignee: LEDUP ENTERPRISE MANUFACTURING Co Ltd (CHINA)
Current assignee: GUANGDE LEDUP ENTERPRISE, INC.
Priority date: 2010-08-17
Filing date: 2010-08-17
Publication date: 2011-03-30
Anticipated expiration: 2020-08-17

Abstract

The utility model discloses an LED lamp tube protective circuit structure, which includes a switching control module and a high-voltage protection control module and is composed of electronic elements such as triodes, silicon controlled thyristors, voltage stabilizing tubes and the like. On one hand, a protective circuit arranged in a lamp tube can guarantee low-voltage start of the protection control module without changing electric parameters such as current, power factors and the like of the lamp tube after an external power source is accessed normally. On the other hand, when the lamp tube is connected to a circuit mistakenly, a starter can be disconnected by the switching control module so that the starter can not function in switching when a traditional inductance type ballast is adopted, and the protective circuit can disconnect a resonant circuit when a modern electronic ballast is adopted. Accordingly, the ballasts are prevented from generating higher voltage so that the protective circuit of the lamp tube can work within a normal high-voltage range, and the lamp tube can not be damaged after a load is disconnected by a protection control circuit. Rigorous requirements on the external power source of the LED lamp tube protective circuit structure are lowered, and product quality and safety performance are improved.

Description

LED fluorescent tube protective circuit structure

Technical field

The utility model relates to a kind of LED fluorescent tube protective circuit structure.

Background technology

Traditional fluorescent structure has dual mode: inductance type ballast and high-frequency ac electric ballast.

Be that inductance type ballast or high-frequency ac electric ballast provide instant high-voltage all can be for fluorescent start the time, and the LED fluorescent tube of external power supply under the situation that does not insert external conversion electric power directly misconnection to the traditional fluorescent lamp lamp socket, gently then the LED fluorescent tube will burn, serious security incident such as heavy then breaking out of fire etc.Simultaneously because the LED fluorescent tube is had relatively high expectations to source current, if when damaging appears in external power supply, above-mentioned similar problem appears easily also.

The utility model content

The purpose of this utility model provides a kind of LED fluorescent tube protective circuit structure, to solve the problem that has the own external power supply power supply quality decline of misconnection, misconnection or product when the LED fluorescent tube is replaced traditional fluorescent lamp and damaging when installing.

The technical solution of the utility model is as follows:

A kind of LED fluorescent tube protective circuit structure, include switching controls module and high voltage protective control module, it is characterized in that: described switching controls module includes two wiring that connect LED lamp socket two ends binding post, between two wiring and be connected to two bridge rectifier BG1, BG2, draw lead respectively and meet at one from second terminals of described bridge rectifier BG1, BG2, constitute anodal wiring; Draw lead respectively and meet at one from the 4th terminals of described bridge rectifier BG1, BG2, constitute the negative pole wiring;

Described high voltage protective control module includes two wiring of drawing from the positive and negative electrode wiring of described switching controls module, two wiring insert first and third terminals of rectifier circuit in the fluorescent tube respectively, second, four terminals of rectifier circuit are drawn first and second wiring respectively in the described fluorescent tube, and insert the two ends of T8 fluorescent tube respectively, between described first and second wiring and be connected to first, second and third branch road; Described first route resistance R 1, R2 are composed in series, described second route resistance R 3, R4 and capacitor C 1 are formed, connect with resistance R 3 after wherein resistance R 4 and capacitor C 1 are in parallel, described the 3rd route triode VT and peripheral circuit thereof are formed, the collector electrode of described triode VT is connected with resistance R 5 by lead, the base stage of triode VT is connected with voltage stabilizing didoe Z2 by lead, is connected with diode D1 by lead between described resistance R 5 and the voltage stabilizing didoe Z2; Line between resistance R 3, the R4 is provided with first terminals, draws two wiring respectively from first terminals, and wherein a wiring links to each other with voltage stabilizing didoe Z2, links to each other with resistance R 2 behind another root wiring serial connection controllable silicon SCR1; Line between resistance R 1, the R2 is provided with second terminals, from inserting the control end of controllable silicon SCR 1 after second terminals are drawn wiring serial connection voltage stabilizing didoe Z1; The emitter of described triode VT is connected with the branch road that is in parallel by resistance R 6 and capacitor C 2 by lead, is serially connected with controllable silicon SCR 2 on the line between resistance R 6 and the T8 fluorescent tube, and the control end of controllable silicon SCR 2 links to each other by the emitter of lead with triode VT.

The beneficial effects of the utility model:

Be built in this protective circuit at fluorescent tube, guarantee low-voltage unlatching protection control module on the one hand behind normal access external power supply, fluorescent tube operate as normal, protective circuit do not change electrical quantitys such as this lamp tube current, power factors;

On the other hand when circuit is gone in the fluorescent tube misconnection: for traditional inductance type ballast, this switching controls module can be cut and be opened starter, makes starter can't play on-off action; For hyundai electronics formula ballast; this circuit can cut resonant circuit; the purpose of the two can both cause ballast can't produce very high voltage; allow the protective circuit of fluorescent tube be operated in the scope of normal high voltage; and normal high voltage adds fluorescent tube, and protection control circuit disconnecting consumers protection fluorescent tube is not damaged.

Simultaneously, the utility model protective circuit also greatly reduces the harsh requirement to self external power supply, has therefore improved product quality and security of products energy greatly.

Description of drawings

Fig. 1 is the LED fluorescent tube schematic diagram of the utility model circuit structure.

Fig. 2 is a switching controls modular circuit structure chart.

Fig. 3 is a high voltage protective control module circuit structure diagram.

Embodiment

Referring to Fig. 1,2,3, a kind of LED fluorescent tube protective circuit structure, include switching controls module and high voltage protective control module, the switching controls module includes two wiring that connect LED lamp socket two ends binding post, between two wiring and be connected to two bridge rectifier BG1, BG2, draw lead respectively and meet at one from second terminals of bridge rectifier BG1, BG2, constitute anodal wiring; Draw lead respectively and meet at one from the 4th terminals of bridge rectifier BG1, BG2, constitute the negative pole wiring;

The high voltage protective control module includes two wiring of drawing from the positive and negative electrode wiring of switching controls module, two wiring insert first and third terminals of rectifier circuit in the fluorescent tube respectively, second, four terminals of rectifier circuit are drawn first and second wiring respectively in the fluorescent tube, and insert the two ends of T8 fluorescent tube respectively, between first and second wiring and be connected to first, second and third branch road; First route resistance R 1, R2 are composed in series, second route resistance R 3, R4 and capacitor C 1 are formed, connect with resistance R 3 after wherein resistance R 4 and capacitor C 1 are in parallel, the 3rd route triode VT and peripheral circuit thereof are formed, the collector electrode of triode VT is connected with resistance R 5 by lead, the base stage of triode VT is connected with voltage stabilizing didoe Z2 by lead, is connected with diode D1 by lead between resistance R 5 and the voltage stabilizing didoe Z2; Line between resistance R 3, the R4 is provided with first terminals, draws two wiring respectively from first terminals, and wherein a wiring links to each other with voltage stabilizing didoe Z2, links to each other with resistance R 2 behind another root wiring serial connection controllable silicon SCR1; Line between resistance R 1, the R2 is provided with second terminals, from inserting the control end of controllable silicon SCR 1 after second terminals are drawn wiring serial connection voltage stabilizing didoe Z1; The emitter of triode VT is connected with the branch road that is in parallel by resistance R 6 and capacitor C 2 by lead, is serially connected with controllable silicon SCR 2 on the line between resistance R 6 and the T8 fluorescent tube, and the control end of controllable silicon SCR 2 links to each other by the emitter of lead with triode VT.

By the switching of the realization of the control module in the protective circuit to the starter and the electronic type rectifier resonance in modern times of traditional inductance type ballast; guarantee not produce the moment very high voltage, make each element of the high voltage protective control circuit in the protective circuit can operate as normal.

And the high pressure of civil power enters when protecting control module, and the controllable silicon in the circuit disconnects tube load LED rapidly, guarantees that LED is not damaged.

Concrete operation principle is as follows:

(1), bridge rectifier BG1, BG2 realize to switch starter and resonant circuit, makes it not produce the moment very high voltage, guarantees protection control module element operate as normal.

(2), operate as normal:

When circuit inserts correct voltage, controllable silicon SCR 1 triggerless voltage, controllable silicon SCR 1 can't conducting, when capacitor C 1 charging reaches the base voltage of work of triode VT, triode VT conducting, controllable silicon SCR 2 triggering and conducting, T8 lamp works.

(3), misconnection voltage:

When circuit misconnection 120V voltage; in that capacitor C 1 is still uncharged when reaching the base stage cut-in voltage; high voltage has triggered controllable silicon SCR 1 conducting; pressure with triode VT base stage clamper at earth potential; thereby triode VT forever can't conducting during high voltage; controllable silicon SCR 2 can not be triggered, and fluorescent tube is protected when high voltage.

Concrete element function in the utility model circuit is as follows:

(1), resistance R 1, R2 dividing potential drop make the controllable silicon SCR 1 under the low-voltage can not trigger work, resistance R 3, R4 dividing potential drop and to capacitor C 1 charging turn-on transistor VT trigger controllable silicon SCR 2 then and make lamp works; Simultaneously when high voltage because capacitor C 1 needs the charging interval, controllable silicon SCR 1 is than the first work of SCR2 like this, clamper triode VT base stage, but assurance keyholed back plate SCR2 is not triggered and protects fluorescent tube.

(2), voltage stabilizing didoe Z1, Z2 are the voltage in order to select to mate.

(3), diode D1 is fast to capacitor C 1 discharge when closing fluorescent tube.

(4), capacitor C 2 is to absorb the high pressure pulse such as to disturb in the circuit, guarantees that controllable silicon SCR 2 is not by false triggering.

Claims

1. LED fluorescent tube protective circuit structure, include switching controls module and high voltage protective control module, it is characterized in that: described switching controls module includes two wiring that connect LED lamp socket two ends binding post, between two wiring and be connected to two bridge rectifier BG1, BG2, draw lead respectively and meet at one from second terminals of described bridge rectifier BG1, BG2, constitute anodal wiring; Draw lead respectively and meet at one from the 4th terminals of described bridge rectifier BG1, BG2, constitute the negative pole wiring;