CN101969730A - Inverter for cold cathode fluorescent lamps - Google Patents
Inverter for cold cathode fluorescent lamps Download PDFInfo
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- CN101969730A CN101969730A CN2010102397417A CN201010239741A CN101969730A CN 101969730 A CN101969730 A CN 101969730A CN 2010102397417 A CN2010102397417 A CN 2010102397417A CN 201010239741 A CN201010239741 A CN 201010239741A CN 101969730 A CN101969730 A CN 101969730A
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Abstract
The invention relates to an inverter for cold cathode fluorescent lamps, which comprises a filter circuit and a rectifier circuit connected with the filter circuit, wherein the rectifier circuit is connected with a control and half-bridge integrated circuit; and a half-bridge driving chip is connected with a boosted circuit. In the inverter for cold cathode fluorescent lamps, the circuit adopts integrated intelligent IC management, a high performance transformer and other solutions so as to realize quick preheating, triggering and operation; the circuit also comprises an EMI filter and a rectifier stage. The circuit half-bridge driving chip adopts IMP3521, IMP3522 or IMP3523. The preheating time is adjustable, and the operating frequency can be set to change the lamp power, thereby avoiding the soft startup of lamp flickering at high starting frequency, protecting the circuit in case of open circuit of filament and trigger failure; and the inverter can automatically restart after the low line voltage input protection and voltage rise. By optimally matching high performance CCFL lamp tube design, the power supply has the advantages of high efficiency, long service life, intelligent adjustment, abnormity protection, low electromagnetic interference and the like; and the circuit is simple and compact, and has high cost performance.
Description
Technical field
The present invention relates to a kind of inverter, be specifically related to a kind of inverter that is used for used for cold cathode fluorescent lamp.
Background technology
Present used for cold cathode fluorescent lamp inverter generally is the solution that adopts discrete component, adopts discrete original paper power consumption bigger, and efficient is generally bad; The preheating of discrete component inverter is slow, and the electromagnetic interference of generation is bigger.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of cold-cathode fluorescence lamp that is applicable to and uses, and preheating is fast, possesses intelligent adjusting, abnormal protection, low electromagnetic interference, the used for cold cathode fluorescent lamp inverter of long service life.
The object of the present invention is achieved like this: a kind of used for cold cathode fluorescent lamp inverter, comprise filter circuit, and the rectification circuit that is connected with filter circuit, rectification circuit is connected with the half-bridge driven chip, and the half-bridge driven chip is connected with booster circuit.
Between the both positive and negative polarity output of rectification circuit, be parallel with first electric capacity;
Between the both positive and negative polarity output of rectification circuit, be parallel with the voltage stabilizing start-up circuit that constitutes by first voltage stabilizing didoe, second electric capacity and first resistance;
The cathode output end of rectification circuit is connected with 3 pin of half-bridge driven chip, the cathode output end of rectification circuit is connected with 5 pin of half-bridge driven chip through first resistance, 6 pin of half-bridge driven chip are connected with the cathode output end of rectification circuit, 7 pin of half-bridge driven chip are connected with the cathode output end of rectification circuit through second resistance, 8 pin of half-bridge driven chip are connected with the cathode output end of rectification circuit through the 3rd electric capacity, 4 pin of half-bridge driven chip are connected with the 5th electric capacity and the transformer of booster circuit through the 4th electric capacity, 2 pin of half-bridge driven chip are connected with the 4th electric capacity and the 5th electric capacity, and 1 pin of half-bridge driven chip is connected with the cathode output end and the booster circuit of rectification circuit.
Booster circuit comprises transformer and the 6th electric capacity.
The half-bridge driven chip adopts IMP3521, IMP3522 or IMP3523.
Used for cold cathode fluorescent lamp inverter provided by the invention, circuit adopts solutions such as integrated intelligent IC management, high-performance variable depressor, military discipline level electrochemical capacitor, preheating soon, triggering and operation, also comprise electromagnetic interface filter and rectification stage, this circuit is based on rectifier control chip IMP3521, IMP3522 or IMP3523.The function of chip I MP3521, IMP3522 or IMP3523 is as follows: warm-up time is adjustable; adjustable running frequency is to be provided with lamp power; can avoid the soft start of the high initial frequency of lamp flicker; error protection when filament open circuit and triggering failure, the automatic restarting of low line voltage input protection and voltage rising back.The electric capacity that boosts in the output circuit plays the stopping direct current effect, and transformer promotes output voltage, changes by the leakage inductance Control current, realizes constant current output.
By the design of optimization of matching high-performance CCFL fluorescent tube, power supply possesses functions such as high efficiency, life-span length, intelligent adjusting, abnormal protection, low electromagnetic interference, circuit concision and compact, cost performance height.
Description of drawings
The invention will be further described below in conjunction with drawings and Examples.
Fig. 1 is circuit theory diagrams of the present invention.
Embodiment
As shown in Figure 1, a kind of used for cold cathode fluorescent lamp inverter comprises filter circuit, the rectification circuit that is connected with filter circuit, and rectification circuit is connected with the half-bridge driven chip, and the half-bridge driven chip is connected with the output circuit that boosts.
Between the both positive and negative polarity output of rectification circuit, be parallel with first capacitor C 1;
Between the both positive and negative polarity output of rectification circuit, be parallel with the voltage stabilizing start-up circuit that constitutes by the first voltage stabilizing didoe D1, second capacitor C 2 and electric first resistance (R1);
The cathode output end of rectification circuit is connected with 3 pin of half-bridge driven chip, the cathode output end of rectification circuit is connected with 5 pin of half-bridge driven chip through first resistance R 1,6 pin of half-bridge driven chip are connected with the cathode output end of rectification circuit, 7 pin of half-bridge driven chip are connected with the cathode output end of rectification circuit through second resistance R 22,8 pin of half-bridge driven chip are connected with the cathode output end of rectification circuit through the 3rd capacitor C 3,4 pin of half-bridge driven chip are connected with the 5th capacitor C 5 and the transformer T1 of the output circuit that boosts through second capacitor C 2,2 pin of half-bridge driven chip are connected with the 4th capacitor C 4 and electric five capacitor C 5, and 1 pin of half-bridge driven chip is connected with the cathode output end of rectification circuit and the output circuit that boosts.
The described output circuit that boosts comprises transformer T1 and the 6th capacitor C 6.
Described half-bridge driven chip adopts IMP3521, IMP3522 or IMP3523.
The present invention, R1, C2 are for starting power supply; By R22 frequency is set; By C3 is set warm-up time; C4 is a working power; C5 and D2 are the pump auxiliary circuit; DB is a rectifier bridge; F is insurance; L is the filtering sense; AC1 and AC2 are the input power supply, and O1 and O2 are output.
The effect of T1 is booster tension and Current Control in the booster circuit, in order to the coupling cold-cathode fluorescence lamp; C6 plays the effect of handing over every straight-through.
Designing requirement of the present invention:
(1), high efficiency (system effectiveness〉90%);
(2), extra long life (〉 50000hr);
(3), running frequency is adjustable;
(4), warm-up time is adjustable;
(5), filament is opened a way and is not had the lamp protection;
(6), trigger the protection of failure and invalid lamp;
(7), input AC line brownout protection.
Electric characteristic of the present invention:
Operating voltage: 180 ~ 264Vac, 210 ~ 230Vac light efficiency the best;
Input power/electric current: 9W/40mA, 11W/50mA, 13W/60mA, 15W/70mA;
Initial frequency: 98KHz, average running frequency: 50KHz.
Half-bridge driven chip of the present invention adopts IMP3521, IMP3522 or IMP3523.Have self adaptation zero-voltage minimum-current switch (ZVMCS, the adaptability running frequency is converted to zero voltage switch), built-in crest than and non-zero voltage switch (ZVS) protection, the while also integrated bootstrap diode and 2 half-bridge power MOSFET.The core of IMP3522 is a voltage controlled oscillator (VCO) and the input of 0 ~ 5V aanalogvoltage with outside programming minimum frequency function.It utilizes VS pin (half-bridge midpoint voltage) to do overcurrent protection and detects non-ZVS state, and the Rdson resistance when low side MOSFET conducting detects high voltage bus voltage as current sense resistance.A built-in 600V fet driver is connected the VS pin with the VS sensor circuit, at the LO pin is that the VS pin is accurately measured, other parts a switch periods, when the high-end MOSFET of HO control is open-minded, when being in the dc bus current potential, can bear on the VS pin high pressure of dc bus.This has saved and has been used for the precision resister of detection of excessive current.Because the advantageous characteristic of the half-bridge driven chip that the present invention adopts; utilize the CCFL circuit solution of the half-bridge driven chip that the present invention adopts to have excellent reliability and long lamp life-span than self-oscillation scheme; also have the lamp inefficacy and hang down the input line voltage protection, also reduced component number simultaneously.
Claims (4)
1. a used for cold cathode fluorescent lamp inverter comprises filter circuit, and the rectification circuit that is connected with filter circuit is characterized in that: rectification circuit is connected with the half-bridge driven chip, and the half-bridge driven chip is connected with booster circuit.
2. used for cold cathode fluorescent lamp inverter according to claim 1 is characterized in that: be parallel with first electric capacity (C1) between the both positive and negative polarity output of rectification circuit;
Between the both positive and negative polarity output of rectification circuit, be parallel with the voltage stabilizing start-up circuit that constitutes by the first voltage stabilizing didoe D1, second capacitor C 2 and electric first resistance (R1);
The cathode output end of rectification circuit is connected with 3 pin of half-bridge driven chip, the cathode output end of rectification circuit is connected with 5 pin of half-bridge driven chip through first resistance (R1), 6 pin of half-bridge driven chip are connected with the cathode output end of rectification circuit, 7 pin of half-bridge driven chip are connected with the cathode output end of rectification circuit through second resistance (R22), 8 pin of half-bridge driven chip are connected with the cathode output end of rectification circuit through the 3rd electric capacity (C3), 4 pin of half-bridge driven chip are connected with the 5th electric capacity (C5) and the transformer (T1) of booster circuit through second electric capacity (C2), 2 pin of half-bridge driven chip are connected with the 4th electric capacity (C4) and electric five electric capacity (C5), and 1 pin of half-bridge driven chip is connected with the cathode output end and the booster circuit of rectification circuit.
3. used for cold cathode fluorescent lamp inverter according to claim 1 and 2 is characterized in that: described booster circuit comprises transformer (T1) and the 6th electric capacity (C6).
4. used for cold cathode fluorescent lamp inverter according to claim 1 and 2 is characterized in that: the half-bridge driven chip adopts IMP3521, IMP3522 or IMP3523.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102397417A CN101969730A (en) | 2010-07-29 | 2010-07-29 | Inverter for cold cathode fluorescent lamps |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102397417A CN101969730A (en) | 2010-07-29 | 2010-07-29 | Inverter for cold cathode fluorescent lamps |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101969730A true CN101969730A (en) | 2011-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010102397417A Pending CN101969730A (en) | 2010-07-29 | 2010-07-29 | Inverter for cold cathode fluorescent lamps |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102523669A (en) * | 2011-12-09 | 2012-06-27 | 三峡大学 | Abnormality protection circuit for electronic ballast of cold cathode lamp |
| CN102625552A (en) * | 2012-03-05 | 2012-08-01 | 朱文中 | Power driving circuit board for cold cathode fluorescent lamp |
| CN103702499A (en) * | 2014-01-02 | 2014-04-02 | 宜昌劲森光电科技股份有限公司 | Lighting device based on cold cathode lamp tube driven by electronic ballast |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1886020A (en) * | 2005-06-20 | 2006-12-27 | 三星电机株式会社 | Driving apparatus for CCFL |
| CN1967322A (en) * | 2006-08-24 | 2007-05-23 | 深圳创维－Rgb电子有限公司 | Energy saving power supply of backlight source of LCD device |
-
2010
- 2010-07-29 CN CN2010102397417A patent/CN101969730A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1886020A (en) * | 2005-06-20 | 2006-12-27 | 三星电机株式会社 | Driving apparatus for CCFL |
| CN1967322A (en) * | 2006-08-24 | 2007-05-23 | 深圳创维－Rgb电子有限公司 | Energy saving power supply of backlight source of LCD device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102523669A (en) * | 2011-12-09 | 2012-06-27 | 三峡大学 | Abnormality protection circuit for electronic ballast of cold cathode lamp |
| CN102523669B (en) * | 2011-12-09 | 2014-03-05 | 三峡大学 | Abnormality protection circuit for electronic ballast of cold cathode lamp |
| CN102625552A (en) * | 2012-03-05 | 2012-08-01 | 朱文中 | Power driving circuit board for cold cathode fluorescent lamp |
| CN103702499A (en) * | 2014-01-02 | 2014-04-02 | 宜昌劲森光电科技股份有限公司 | Lighting device based on cold cathode lamp tube driven by electronic ballast |
| CN103702499B (en) * | 2014-01-02 | 2016-09-28 | 宜昌劲森光电科技股份有限公司 | A kind of illuminator based on cold cathode lamp tube driven by electronic ballast |
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Application publication date: 20110209 |