CN2805296Y

CN2805296Y - Parallel drive unit of high voltage discharge tube

Info

Publication number: CN2805296Y
Application number: CN 200520002786
Authority: CN
Inventors: 庄惠娟
Original assignee: HUAYUAN CO Ltd
Current assignee: HUAYUAN CO Ltd
Priority date: 2005-03-16
Filing date: 2005-03-16
Publication date: 2006-08-09
Anticipated expiration: 2015-03-16

Abstract

The utility model relates to a parallel drive device of a high-voltage discharge strip lamp, which comprises a first high-pressure discharge strip lamp zone, a second high-pressure discharge strip lamp zone, a transformer and a drive circuit, wherein the first output end of the transformer is connected with the first high-pressure discharge strip lamp zone; the second output end of the transformer is connected with the second high-pressure discharge strip lamp zone. High-pressure discharge strip lamps within the first high-pressure discharge strip lamp zone can be used in a way of connection in parallel. High-pressure discharge strip lamps within the second high-pressure discharge strip lamp zone can be used in a way of connection in parallel. Efficacy actions of charge and discharge can be directly realized by making use of the strip lamps, and current and capacitors do not need to be limited. Through the design that two output ends on the secondary side of the transformer are respectively connected with the first high-pressure discharge strip lamp zone and the second high-pressure discharge strip lamp zone, the using number of transformers is decreased and a transformer with a large volume can be used. The manufacture is easy, the fine rate is enhanced and the cost is reduced.

Description

Electrion fluorescent tube drive unit in parallel

Technical field

The utility model is about a kind of electrion fluorescent tube drive unit in parallel, it is low to refer in particular to a kind of cost, quality better, use complete electrion fluorescent tube circuit, the backlight that can apply to large-scale LCD (as LCD-TV) provides the driving utilization circuit of a plurality of electrion fluorescent tubes, respectively be connected with the design in the first high-pressure discharge lamp area under control and the second high-pressure discharge lamp area under control by Circuit Fault on Secondary Transformer two outputs, reduce the transformer usage quantity, and can use the transformer of larger volume, make easily and yield improves and reduces cost, the in parallel use of electrion fluorescent tube that is aided with the high-pressure discharge lamp area under control, and directly make the effect action that discharges and recharges with fluorescent tube and replace current limiting capacitance, and make the electric current average degree between fluorescent tube improve, and reduce the mutual interference mutually between fluorescent tube and fluorescent tube, the generation of no luminance nonuniformity phenomenon.

Background technology

The fast development of science and technology, effectively promoted human standard of living, and pursue quality of the life more efficiently, and facilitate the repeatedly revolution on the human industry, and wherein the industry of LCD-TV and plasm TV replaces traditional tv just gradually and becomes main flow in the audiovisual life.

The backlight of LCD-TV must be used many cold-cathode tubes, and cold-cathode tube is to belong to a kind of fluorescent tube with discharge characteristics; This electrion fluorescent tube of each root all needs a drive circuit in the backlight of traditional LC D-TV, and needs the considerable cost of cost.

Traditional, as shown in Figure 1, can in electrion fluorescent tube and transformer, add commutation capacitor, light most electrion fluorescent tubes with parallel way, and its benefit is that cost is low, only need to use a drive circuit; Yet, because the excessive generation with phase shift of potential difference between each electrion fluorescent tube, may take place that the lamp current average degree is poor, interference mutual between fluorescent tube is big, and fluorescent tube length has the existence of the basic shortcomings such as situation of comparatively obviously flicker when longer.

So, as shown in Figure 2, the pioneer of related industry research and development proposes to use a dew to let out magnetic flux type transformer with an electrion fluorescent tube, light most electrion fluorescent tubes with parallel way, consider the quality of backlight, fail safe, with respect to the full beam efficiency of electric power, this really is a feasible program; Yet, the consequence that this circuit produced but is that the transformer use amount is too much, therefore makes reduce relative with speed of non-defective unit that is difficult for, produces, thereby raise the cost, too high cost but makes its (as shown in Figure 2) can't replace the technology of the basic shortcoming of existing (as shown in Figure 1) tool fully.

Therefore, how to solve dew of this existing electrion fluorescent tube configuration and let out magnetic flux type transformer, the puzzlement that cost is too high, the quantity of reduction transformer is exactly present significant problem to be solved.

Summary of the invention

In view of the shortcoming that above-mentioned prior art caused, main purpose of the present utility model is that the shortcoming at prior art develops and electrion fluorescent tube drive unit in parallel, effectively avoiding an above-mentioned electrion fluorescent tube uses a dew to let out the too high shortcoming of magnetic flux type transformer (as shown in Figure 2) cost, not only can reduce the quantity that transformer uses, and it is relative because can use the transformer of larger volume, so making is easy and yield increases equally, and then can reduce production costs.

Another purpose of the present utility model is at adding commutation capacitor in above-mentioned electrion fluorescent tube (as shown in Figure 1) and the transformer, lighting most high-pressure discharge lamp tube models with parallel way is improved, directly make the effect action that discharges and recharges with fluorescent tube and replace current limiting capacitance, and make the electric current average degree between fluorescent tube improve, and reduce the mutual interference mutually between fluorescent tube and fluorescent tube, the generation of no luminance nonuniformity phenomenon, on in the quality of backlight, fail safe, with respect to the full beam efficiency of electric power all than prior art advanced person, and too high sorry of cost free.

For reaching above-mentioned and other purpose, the utility model provides a kind of electrion fluorescent tube drive unit in parallel, the backlight that is applicable to large-scale LCD (as LCD-TV) provides the driving of a plurality of electrion fluorescent tubes to use circuit, this drive unit comprises the first high-pressure discharge lamp area under control at least, and a plurality of electrion fluorescent tubes of this first high-pressure discharge lamp area under control tool are in parallel to be used; The second high-pressure discharge lamp area under control, this second high-pressure discharge lamp area under control have the use in parallel of a plurality of electrion fluorescent tubes equally; One transformer, these Circuit Fault on Secondary Transformer two outputs are connected to the first high-pressure discharge lamp area under control and the second high-pressure discharge lamp area under control; One drive circuit, this drive circuit have two inputs (the 1st, 3 pin) that two transistor is connected in the transformer primary side.

First output of this voltage device secondary side (the 4th pin) has a plurality of electrion fluorescent tubes with the first high-pressure discharge lamp area under control and is connected, and this first high-pressure discharge lamp area under control has the use parallel with one another of a plurality of electrion fluorescent tubes; Second output of this voltage device secondary side (the 5th pin) is connected with a plurality of electrion fluorescent tubes of the second high-pressure discharge lamp area under control tool, and the use parallel with one another of these a plurality of electrion fluorescent tubes of second high-pressure discharge lamp area under control tool; So reduce the usage quantity of transformer on the one hand relatively, and relative reduces production costs, make then that on the other hand the high-pressure discharge lamp pipe of same district has the voltage of homophase, potential difference diminishes and does not have the generation of phase shift, and it is low to order about interference mutual between lamp current average degree height, fluorescent tube.

In addition, primary side two inputs of this voltage device (the 1st, 3 pin) are connected to the collection utmost point of above-mentioned this two transistor, the base terminal of this two transistor then is connected in modulation circuit, directly control this two-transistor by this modulation circuit, but and steady job frequency, be not subjected to the influence of transformer resonance, and can significantly change the output current of drive circuit, and change frequency as required and do not need to revise the part value.

Description of drawings

Fig. 1 is existing circuit diagram.

Fig. 2 is another existing circuit diagram.

Fig. 3 is the circuit diagram of the utility model electrion fluorescent tube drive unit one preferred embodiment in parallel.

Fig. 4 is the circuit diagram of the utility model electrion fluorescent tube another embodiment of drive unit in parallel.

Fig. 5 is a wherein enforcement illustration of electrion fluorescent tube ground connection of the utility model.

Fig. 6 is wherein another enforcement illustration of electrion fluorescent tube ground connection of the utility model.

Fig. 7 is a wherein enforcement illustration again of electrion fluorescent tube ground connection of the utility model.

Description of reference numerals:

1 first high-pressure discharge lamp area under control

The a plurality of electrion fluorescent tubes in 10 first high-pressure discharge lamp areas under control

2 second high-pressure discharge lamp areas under control

The a plurality of electrion fluorescent tubes in 20 second high-pressure discharge lamp areas under control

The L1 inductance

R resistance

3 transformers

30 transformer first input ends

31 transformers, second input

32 transformers the 3rd input

33 transformers, first output

34 transformers, second output

4 drive circuits

The Q1 the first transistor

The Q2 transistor seconds

The L buffer inductance

5 modulation circuits

Embodiment

Below be that the person skilled in the art can understand other advantage of the present utility model and effect easily by the disclosed content of this specification by specific instantiation explanation collocation execution mode of the present utility model.The utility model also can be implemented or be used by other different instantiation, and the every details in this specification also can be carried out various modifications and change based on different viewpoints and application under not departing from spirit of the present utility model.

At first see also shown in Figure 3ly, a kind of electrion fluorescent tube of the utility model drive unit in parallel comprises:

The first high-pressure discharge lamp area under control 1, be connected in first output 33 of transformer 3, and possess a plurality of electrion fluorescent tubes 10 are arranged, these a plurality of electrion fluorescent tube 10 transformer first outputs 33 that are connected in parallel with one another, so have identical potential difference, the generation of no phase shift, and make lamp current average degree height and reduce mutual interference between fluorescent tube;

The second high-pressure discharge lamp area under control 2, be connected in second output 34 of transformer, this second high-pressure discharge lamp area under control 2 has equally that a plurality of electrion fluorescent tube 20 is parallel with one another to be connected in transformer second output 34 and to have the effect same with the first high-pressure discharge lamp area under control 1;

One transformer 3, its first input end 30 is connected in the first transistor Q1, second input 31 connects a buffer inductance L, the 3rd input 32 is connected in transistor seconds Q2, these transformer 3 secondary sides two outputs 33,34 are connected to the first high-pressure discharge lamp area under control 1 and the second high-pressure discharge lamp area under control 2, two high-pressure discharge lamp areas under

control

1,2 share a transformer 3, thereby the quantity of reduction transformer 3 uses, and it is relative because can use the transformer 3 of larger volume, become than being easier to and yield increases equally so make, and then can reduce production costs;

One drive circuit 4, this drive circuit 4 has the first transistor Q1, transistor seconds Q2, an and buffer inductance L, the collection utmost point of this first transistor Q1 is connected in transformer first input end 30, the collection utmost point of transistor seconds Q2 is connected in transformer the 3rd input 32, and this two transistor Q1, the base terminal of Q2 then is connected in a modulation circuit 5, directly control this two transistor Q1 by this modulation circuit, Q2, and can the steady job frequency, be not subjected to the influence of transformer resonance, and can significantly change the output current of drive circuit, and change frequency as required and do not need to revise the part value, the buffer inductance L of this drive circuit 4 then is connected in transformer second input 31 in addition.

Then, please continue to consult Fig. 4 arranges in pairs or groups shown in the preceding figure; Two transistor Q1 described in the utility model, Q2 can be any type of transistor, for example are field-effect transistor (FET).

In addition, above-mentioned respectively this electrion

fluorescent tube

10,20 is serially connected with an inductance L 1 respectively, to make the usefulness of balance.Each inductance L 1 can be serially connected with respectively between this electrion fluorescent tube and transformer 3 outputs (as shown in Figure 3); Or be serially connected with respectively between this electrion fluorescent tube and ground connection (as shown in Figure 4).In addition, for the ground connection of this electrion

fluorescent tube

10,20 respectively, can be as shown in Figure 5, direct ground connection after this electrion fluorescent tube parallel connection respectively; Or as shown in Figure 6, will be respectively after this electrion fluorescent tube parallel connection and be connected in series ground connection after the resistance R; Or as shown in Figure 7, respectively this electrion fluorescent tube respectively is connected in series a resistance R and gives back in parallel ground connection again.This resistance R is the usefulness as protection and detection.

The foregoing description is exemplary illustration principle of the present utility model and effect thereof, and the embodiment of part utilization, but not is used to limit of the present utility model defining.Any personage who is familiar with this technology all can be under spirit of the present utility model and category, and the foregoing description is modified and changed.Therefore, rights protection scope of the present utility model should be with being as the criterion that claims were defined.

Claims

1. an electrion fluorescent tube drive unit in parallel is characterized in that, comprising:

The first high-pressure discharge lamp area under control has a plurality of electrion fluorescent tubes, these a plurality of electrion fluorescent tubes first output that is connected in a Circuit Fault on Secondary Transformer parallel with one another;

The second high-pressure discharge lamp area under control also has a plurality of electrion fluorescent tubes second output that is connected in this Circuit Fault on Secondary Transformer parallel with one another;

One transformer, its primary side have first input end, second input, and the 3rd input; This Circuit Fault on Secondary Transformer then has first output and second output, and this two output then is connected to this first high-pressure discharge lamp area under control and this second high-pressure discharge lamp area under control;

One drive circuit, it has the first transistor, transistor seconds and a buffer inductance; The collection utmost point of this two transistor is connected to this transformer primary side first input end and the 3rd input, and the base terminal of this two transistor is connected in a modulation circuit; This buffer inductance then is connected in second input of this voltage device primary side.

2. electrion fluorescent tube as claimed in claim 1 drive unit in parallel is characterized in that described two transistors are field-effect transistor.

3. electrion fluorescent tube as claimed in claim 1 drive unit in parallel is characterized in that respectively this electrion fluorescent tube is serially connected with an inductance respectively.

4. electrion fluorescent tube as claimed in claim 1 drive unit in parallel is characterized in that, respectively this electrion fluorescent tube is that back in parallel is directly grounded.

5. electrion fluorescent tube as claimed in claim 1 drive unit in parallel is characterized in that, respectively this electrion fluorescent tube is to be connected in series ground connection behind the resistance after the parallel connection again.

6. electrion fluorescent tube as claimed in claim 1 drive unit in parallel is characterized in that, respectively this electrion fluorescent tube is to be connected in series a resistance respectively to give back in parallel ground connection again.