CN201878402U - Electronic ballast for cold-cathode fluorescent lamp - Google Patents
Electronic ballast for cold-cathode fluorescent lamp Download PDFInfo
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- CN201878402U CN201878402U CN2010206177680U CN201020617768U CN201878402U CN 201878402 U CN201878402 U CN 201878402U CN 2010206177680 U CN2010206177680 U CN 2010206177680U CN 201020617768 U CN201020617768 U CN 201020617768U CN 201878402 U CN201878402 U CN 201878402U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
An electronic ballast for a cold-cathode fluorescent lamp comprises an EMC (electromagnetic compatibility) circuit, a bridge rectifier circuit, a switch circuit and a ballast output circuit. The bridge rectifier circuit is connected with a smoothing filtering circuit, the switch circuit comprises an IC (integrated circuit) chip and a peripheral circuit and is used for generating and outputting high-frequency alternating-current voltage based on direct-current voltage, the ballast output circuit consists of a first voltage transformer and a fourth capacitor which are connected in series, and the ballast output circuit is used for boosting the high-frequency alternating-current voltage outputted by the switch circuit, realizing inductance leakage ballasting and outputting constant current to the cold-cathode fluorescent lamp so as to drive the cold-cathode fluorescent lamp. The electronic ballast has the advantages of zero flickering of a switch, resistance to starting impact, adjustable working frequency, fast preheating, abnormal protection, fine constant current output characteristics, convenience in current adjustment and excellent cost performance.
Description
Technical field
The utility model relates to a kind of electric ballast, is specifically related to a kind of used for cold cathode fluorescent lamp electric ballast.
Background technology
Conventional fluorescent adopts the work of hot-cathode electric mode of excitation, and lamp works voltage is low, and light efficiency is poor, and the filament loss is serious, and useful life is short, and energy-saving effect is limited.The electric ballast of most of fluorescent lamps adopts the discrete component design, and circuit function is simple, and is with low content of technology, and the electric ballast power consumption that discrete component is made is bigger, and the parameter fluctuation of each element is big, and circuit reliability is poor, power-efficient is generally not high, and the electromagnetic interference of generation is bigger.
Cold-cathode fluorescence lamp is product backlights such as liquid crystal display, LCD TV as (CCFL), the light efficiency height, and the life-span is long, has obtained to use widely in industrial field of backlights.By CCFL backlight is undergone technological transformation, the illumination of making uses the cold cathode fluorescent lamp photoelectric properties far above traditional fluorescent lamp, but the electrical characteristic of its high voltage, big electric current brings very big difficulty for the design of electric ballast.
At present, the used for cold cathode fluorescent lamp electric ballast seldom is the solution that adopts discrete component, the part cold cathode fluorescent lamp drive circuit that occurs on the market, the electric ballast of over-borrowing mirror CCFL backlight, adopt the drive controlling chip of back light inverter special use, the chip structure complexity costs an arm and a leg.External two power diodes of drive controlling chip (MOSFET) constitute switching circuit, and integrated level is low, circuit synthesis cost height; Voltge surge causes that easily IC damages fault rate height, poor reliability during switch; The fluorescent tube flicker is seriously quickened the loss to electrode, the useful life of having reduced the CCFL light fixture during power cutoff; Employing constitutes resonant circuit at the lamp tube ends high-voltage capacitors connected in parallel, and the back electric capacity shunting of lighting a lamp is serious, reduces the delivery efficiency of power supply; The power supply versatility is poor, and the fluorescent tube that a inverter can only be joined a kind of specification uses, and the fluorescent tube of different size need carry out specialized designs, and the components and parts versatility is poor, and production is bad.High electric ballast cost, complex circuit design and manufacturing technology have raised the price of CCFL electric light source and light fixture, seriously hinder the marketing of CCFL electric light source and light fixture product.
Summary of the invention
The technical problems to be solved in the utility model provides a kind of used for cold cathode fluorescent lamp electric ballast.Possess the switch flicker free, anti-start impact, operating frequency is adjustable, preheating is fast, abnormal protection, constant current good output, Current Regulation is convenient, simple in structure, cost performance is high characteristics.
For solving the problems of the technologies described above, the purpose of this utility model is achieved in that the used for cold cathode fluorescent lamp electric ballast, comprises EMC circuit, bridge rectifier, switching circuit and ballast output circuit,
Bridge rectifier is connected with smoothed filter circuit;
Switching circuit is made up of IC chip and peripheral circuit, and it constitutes based on direct voltage and produces high-frequency ac voltage and output;
The ballast output circuit is by first transformer and the 4th capacitances in series, and its high-frequency ac voltage that constitutes switching circuit output boosts and the leakage inductance ballast, and cold-cathode fluorescence lamp is exported in constant current, thereby drives cold-cathode fluorescence lamp.
Smoothed filter circuit is made of first diode and the series connection of first electrochemical capacitor;
Being connected with the positive pole of first electric capacity by end of first diode, the negative pole of first electric capacity meets electrically GND.
The IC chip comprises two power MOSFETs and intelligent half-bridge control circuit.
The peripheral circuit of switching circuit comprises start-up circuit, switching frequency control circuit and pre-thermal control circuit.
Start-up circuit is connected and is constituted with first resistance, second resistance with the second voltage stabilizing didoe parallel component by second electric capacity in the peripheral circuit of switching circuit;
The positive pole of the one termination rectification circuit output of first resistance, the other end is connected with the VCC pin of IC chip, connects an end of second resistance simultaneously, and another termination of second resistance and the second voltage stabilizing didoe parallel component is GND electrically.
The frequency setting pin of the peripheral circuit medium frequency control circuit of switching circuit is connected back ground connection GND with the 5th resistance.
Set pin in the peripheral circuit of switching circuit in advance the warm-up time of thermal control circuit and be connected back ground connection GND with the 3rd electric capacity.
The ballast output circuit also comprises second inductance, second inductance, first transformer and the 4th capacitances in series.
Total sensibility reciprocal L that the leakage inductance amount of first transformer and second inductance constitute in the ballast output circuit
TotalConstitute the LC resonant circuit with the high frequency parasitic capacitance Cs of first transformer secondary output.
The beneficial effect of the utility model used for cold cathode fluorescent lamp electric ballast is as follows:
1, smoothed filter circuit adopts particular design, increases by a diode and suppresses the back discharge interference; The fluorescent tube flicker that capacitor discharge causes in the time of suppressing power remove, the useful life of prolonging lamp tube.
2, switching circuit adopts two power MOSFETs and the integrated intelligent IC management of control circuit, can pass through the operating state of zero voltage switch (ZVS) Automatic Optimal circuit, and holding circuit good operation characteristic and higher operating efficiency reduce electromagnetic interference.Can be in conjunction with the characteristics of CCFL fluorescent tube, set operating frequency by capacitance settings warm-up time, resistance, realize fast preheating (ms level), optimized switch frequency (50KHz) work, avoid the soft start of the high initial frequency of lamp flicker, error protection when having the filament open circuit and triggering failure, low line voltage input protection and voltage rising back be the restarting function automatically; Start-up circuit adopts particular design, and the voltge surge that can suppress powered on moment is to damage of elements, anti-switching surge; Because switch control and power diode (MOSFET) are integrated, the switching circuit cost is far below control circuit and the discrete solution of power diode (MOSFET), circuit structure compactness, cost performance height.
3, the constant current of ballast output circuit is exported, and adopts the big leakage inductance ballast of transformer, has suppressed " negative resistance charactertistic " of CCFL fluorescent tube, avoids the current fluctuation that causes because of change in resistance in the process of lighting a lamp; Utilize the leakage inductance of step-up transformer and secondary high frequency parasitic capacitance to constitute the LC resonant circuit, circuit is succinct, the power-efficient height; Step-up transformer adopts isolated design, and inferior utmost point maximum output current as 12mA, can effectively be avoided electric shock accidents within the safe range that human body bears; The secondary pin of transformer is exported the antiphase operating voltage over the ground, and the fluorescent tube leakage current is little, the luminous efficiency height, and the actual working voltage to ground of circuit reduced half, avoided the harmful effect of high pressure.
4, according to the volume and the correlation technique requirement of power supply, adopt external inductance and transformer leakage inductance in conjunction with the method for designing that constitutes big inductance ballast, but the flexible inductance value mate different CCFL fluorescent tubes, power supply highly versatile, current wave crest ratio optimization is simple, is fit to produce in batches make.
5, the used for cold cathode fluorescent lamp electric ballast that provides of the utility model, the life-span surpasses 50000 hours, and anti-switch reaches 1,000,000 times, and circuit efficiency is more than 90%, the cost performance height.
Description of drawings:
Below in conjunction with drawings and Examples the utility model is further specified:
Fig. 1 is the utility model circuit diagram.
Fig. 2 is the utility model output circuit equivalent resonant circuit figure.
Fig. 3 is the utility model application circuit.
Embodiment
The used for cold cathode fluorescent lamp electric ballast comprises EMC circuit, bridge rectifier, switching circuit (1) and ballast output circuit 2, and bridge rectifier is connected with smoothed filter circuit 3; Switching circuit 1 is made up of IC chip 4 and peripheral circuit, and it constitutes based on direct voltage and produces high-frequency ac voltage and output; Ballast output circuit 2 is by the first transformer T1 and 4 series connection of the 4th capacitor C, and its high-frequency ac voltage that constitutes switching circuit 1 output boosts and the leakage inductance ballast, and cold-cathode fluorescence lamp is exported in constant current, thereby drives cold-cathode fluorescence lamp.
Described smoothed filter circuit 3 is made of the first diode D1 and first electrochemical capacitor C1 series connection; The first diode D1 is connected with the positive pole of first capacitor C 1 by end, and the negative pole of first capacitor C 1 meets electrically GND.
Described IC chip 4 comprises two power MOSFETs and intelligent half-bridge control circuit.
The peripheral circuit of described switching circuit 1 comprises start-up circuit, switching frequency control circuit and pre-thermal control circuit.
Start-up circuit is connected and is constituted with first resistance R 1, second resistance R 2 with the second voltage stabilizing didoe D2 parallel component by second capacitor C 2 in the peripheral circuit of described switching circuit 1; The positive pole of the one termination rectification circuit output of first resistance R 1, the other end is connected with the VCC pin of IC chip 4, connects an end of second resistance R 2 simultaneously, and another termination of second resistance R 2 and the second voltage stabilizing didoe D2 parallel component is GND electrically.
The frequency setting pin of the peripheral circuit medium frequency control circuit of described switching circuit 1 is connected back ground connection GND with the 5th resistance R 5.
Set pin in the peripheral circuit of described switching circuit 1 in advance the warm-up time of thermal control circuit and be connected back ground connection GND with the 3rd capacitor C 3.
Described ballast output circuit 2 also comprises second inductance L, 2, the second inductance L 2, the first transformer T1 and 4 series connection of the 4th capacitor C.
Total sensibility reciprocal L that the leakage inductance amount of the first transformer T1 and second inductance L 2 constitute in the described ballast output circuit 2
TotalConstitute the LC resonant circuit with the high frequency parasitic capacitance Cs of T1 level of first transformer.
The method that the ballast output circuit 2 of used for cold cathode fluorescent lamp electric ballast is regulated electric current output, keeping changing total inductance amount L in the equivalent operating circuit by at least one of regulating in second inductance L 2 and the first transformer T1 leakage inductance amount under the situation that the first transformer T1 is elementary and time utmost point turn ratio is constant
TotalSize, realize output circuit Gan Kang ∣ j ω L
TotalThe adjusting of ∣, thereby the size of change ballast output circuit 2 output currents.
Operation principle:
As shown in Figure 1, between the both positive and negative polarity output of rectification circuit, be parallel with the shock resistance start-up circuit that constitutes by first resistance R 1, second resistance R 2, the second voltage stabilizing didoe D2, second capacitor C 2.When the moment of civil power input switch closure, first resistance R 1, second resistance R 2 be less than nominal resistance, second capacitor C, 2 large current charges, and voltage raises rapidly, forms instantaneous voltage and impacts, and causes IC chip 4 inner voltage-stabiliser tube overcurrents to damage, and IC chip 4 quits work.Adopt first resistance R 1,2 series connection of second resistance R, and the second diode D2 voltage stabilizing value is lower than built-in voltage-stabiliser tube voltage, with second capacitor C, 2 voltage clamps, the impulse current that bypass is instantaneous, after circuit was stable, resistance reached nominal value, second resistance R, 2 booster tensions, make the vdd pin voltage of IC chip 4 reach the requirement of IC chip 4 internal work voltages, circuit operate as normal.
The first diode D1 that connects between start-up circuit and first capacitor C 1 constitutes discharge and suppresses circuit.First capacitor C 1 is a smoothed filter circuit 3 general after the rectification, generally selects the bigger electrochemical capacitor of appearance value for use.When civil power disconnected, a large amount of electric charges of first capacitor C 1 formed vibration easily at dispose procedure, cause start-up circuit to be opened repeatedly, caused the fluorescent tube flicker.Increase by the first diode D1 oppositely by the time first capacitor C 1 the influence of oscillating discharge, avoided fluorescent tube to glimmer continuously, prolong the useful life of CCFL fluorescent tube.
As shown in Figure 3, adopt the FAN7710VN intelligent chip of fairchild company to constitute half-bridge switch circuit 1, integrated ZVS switch control functions and two power diode MOSFET.
The VDC pin of FAN7710VN and rectification circuit just through being connected behind the first diode D1, insert the DC bus-bar voltage of 311V; The VDD pin inserts the shock resistance start-up circuit, for IC chip 4 provides cut-in voltage and the required electric current of starting working; The RT pin is connected back ground connection GND with the 5th electric capacity R5, selecting the 5th resistance R 5 resistances is 56K Ω, and switching circuit will remain on the operating frequency of 50KHz; The CPH pin is connected back ground connection GND with the 3rd capacitor C 3, selecting the 3rd capacitor C 3 appearance values is 47pF, and circuit is about 10ms warm-up time, start-up time 100ms; The 5th capacitor C 5 provides the chip operate as normal required electric current; The 6th capacitor C 6, the 3rd diode D3, the 4th diode D4 constitute the anti-pump circuit in switch dead band.
Select the appearance value of the 3rd capacitor C 3, when the 3rd capacitor C 3 appearance values were 47 pF, the frequency sweep process was the fastest, and the time that the igniting high pressure continues is the shortest, and is the most favourable to the startup of CCFL fluorescent tube.
The first transformer T1 is the leakage field step-up transformer, the required high working voltage of output CCFL fluorescent tube.The equivalent resistance R of the leakage inductance amount of the first transformer T1 and the sensibility reciprocal of second inductance L 2, CCFL fluorescent tube
Lamp, high voltagehigh frequency parasitic capacitance Cs constitutes the series and parallel resonant circuit, as shown in Figure 2.IC chip 4 switching circuits begin from the downward frequency sweep of high-frequency (as 98KHz) after powering on, when resonance takes place in the Frequency point (as 60KHz) of design, two ends generation-the 300V of the first transformer T1 ~+the instantaneous high pressure pulse of 3000V starts the CCFL fluorescent tube, lamp tube starting is by leakage inductance and second inductance L, 2 ballasts of the first transformer T1, realize the ZVS state at the 50KHz Frequency point, keep the voltage and current of lamp tube ends stable.As shown in Figure 2, under the alternating-current switch frequency of setting, as 50KHz, the leakage inductance of the first transformer T1 and second inductance L, the 2 common Gan Kang ∣ j ω L that constitute
Total∣ is greater than the equiva lent impedance R of CCFL fluorescent tube
Lamp, determined the operating current of series resonant circuit to make output circuit possess constant-current characteristics, can suppress " negative resistance charactertistic " of CCFL fluorescent tube, be reduced in the process of lighting a lamp and cause current fluctuation because of the fluorescent tube change in resistance.The 4th capacitor C 4 works to cut off the logical high-frequency ac of direct current, avoids excessive inductance and the transformer of causing of DC component to generate heat.
According to the operating characteristic requirement of different CCFL fluorescent tubes, inductance value by regulating second inductance L 2 or the leakage inductance amount of the second transformer T2 change L
TotalThe size of sensibility reciprocal, Shi Xian ∣ j ω L
Total∣ induction reactance is regulated, and obtains the required operating current of CCFL fluorescent tube.In circuit design and manufacture process, can carry out coarse adjustment to second inductance L, 2 inductance values, the leakage inductance amount of the second transformer T2 is finely tuned, and makes the crest of lamp current compare less than 1.5 the fluctuation degree of depth minimum of lamp luminescence, light efficiency the best.
The first transformer T1 adopts isolated method for designing, and inferior utmost point maximum output current 18mA can effectively avoid electric shock accidents; The secondary pin of transformer is exported the antiphase operating voltage over the ground, and the fluorescent tube leakage current is little, the luminous efficiency height, and the actual working voltage to ground of circuit reduced half, avoided the harmful effect of high pressure.
Electric characteristic of the present utility model:
Operating voltage: 180 ~ 264Vac, 210 ~ 230Vac light efficiency the best.
Specified input current: 6W/40mA, 7W/50mA, 11W/70mA, 15W/110mA, 20W/150mA.
Rated output power/electric current: 6W/6mA, 7W/7mA, 11W/8mA, 15W/12mA, 20W/18mA.
Initial frequency: 98KHz, spark rate 65KHz, average running frequency: 50KHz.
Preheating igniting time 100ms.
Claims (9)
1. the used for cold cathode fluorescent lamp electric ballast comprises EMC circuit, bridge rectifier, switching circuit (1) and ballast output circuit (2), it is characterized in that:
Bridge rectifier is connected with smoothed filter circuit (3);
Switching circuit (1) is made up of IC chip (4) and peripheral circuit, and it constitutes based on direct voltage and produces high-frequency ac voltage and output;
Ballast output circuit (2) is by first transformer (T1) and the 4th electric capacity (C4) series connection, and its high-frequency ac voltage that constitutes switching circuit (1) output boosts and the leakage inductance ballast, and cold-cathode fluorescence lamp is exported in constant current, thereby drives cold-cathode fluorescence lamp.
2. according to claims 1 described used for cold cathode fluorescent lamp electric ballast, it is characterized in that: smoothed filter circuit (3) is made of first diode (D1) and first electrochemical capacitor (C1) series connection;
Being connected with the positive pole of first electric capacity (C1) by end of first diode (D1), the negative pole of first electric capacity (C1) meets electrically GND.
3. according to claims 1 described used for cold cathode fluorescent lamp electric ballast, it is characterized in that: IC chip (4) comprises two power MOSFETs and intelligent half-bridge control circuit.
4. used for cold cathode fluorescent lamp electric ballast according to claim 1 is characterized in that: the peripheral circuit of switching circuit (1) comprises start-up circuit, switching frequency control circuit and pre-thermal control circuit.
5. according to claim 1 or 4 described used for cold cathode fluorescent lamp electric ballasts, it is characterized in that: start-up circuit is by second electric capacity (C2) and second voltage stabilizing didoe (D2) the parallel component formation of connecting with first resistance (R1), second resistance (R2) in the peripheral circuit of switching circuit (1);
The positive pole of the one termination rectification circuit output of first resistance (R1), the other end is connected with the VCC pin of IC chip (4), an end that connects second resistance (R2) simultaneously, another termination of second resistance (R2) and second voltage stabilizing didoe (D2) parallel component is GND electrically.
6. according to claim 1 or 4 described used for cold cathode fluorescent lamp electric ballasts, it is characterized in that: the frequency setting pin of the peripheral circuit medium frequency control circuit of switching circuit (1) is connected back ground connection GND with the 5th resistance (R5).
7. according to claim 1 or 4 described used for cold cathode fluorescent lamp electric ballasts, it is characterized in that: set pin in the peripheral circuit of switching circuit (1) in advance the warm-up time of thermal control circuit and be connected back ground connection GND with the 3rd electric capacity (C3).
8. used for cold cathode fluorescent lamp electric ballast according to claim 1 is characterized in that: ballast output circuit (2) also comprises second inductance (L2), second inductance (L2), first transformer (T1) and the 4th electric capacity (C4) series connection.
9. according to claims 1 or 8 described used for cold cathode fluorescent lamp electric ballasts, it is characterized in that: the secondary high frequency parasitic capacitance Cs of total sensibility reciprocal Ltotal that the leakage inductance amount of first transformer (T1) and second inductance (L2) constitute in the ballast output circuit (2) and first transformer (T1) constitutes the LC resonant circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206177680U CN201878402U (en) | 2010-11-22 | 2010-11-22 | Electronic ballast for cold-cathode fluorescent lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206177680U CN201878402U (en) | 2010-11-22 | 2010-11-22 | Electronic ballast for cold-cathode fluorescent lamp |
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| Publication Number | Publication Date |
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| CN201878402U true CN201878402U (en) | 2011-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010206177680U Expired - Fee Related CN201878402U (en) | 2010-11-22 | 2010-11-22 | Electronic ballast for cold-cathode fluorescent lamp |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101980587A (en) * | 2010-11-22 | 2011-02-23 | 三峡大学 | Electronic ballast for cold cathode fluorescent lamp and output current adjusting method thereof |
| CN103929868A (en) * | 2013-01-10 | 2014-07-16 | 湛江通用电气有限公司 | Ballast circuit |
| CN111163568A (en) * | 2018-11-06 | 2020-05-15 | 比亚迪股份有限公司 | Vehicle lamp synchronous control method and device, storage medium and vehicle lamp |
-
2010
- 2010-11-22 CN CN2010206177680U patent/CN201878402U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101980587A (en) * | 2010-11-22 | 2011-02-23 | 三峡大学 | Electronic ballast for cold cathode fluorescent lamp and output current adjusting method thereof |
| CN103929868A (en) * | 2013-01-10 | 2014-07-16 | 湛江通用电气有限公司 | Ballast circuit |
| CN111163568A (en) * | 2018-11-06 | 2020-05-15 | 比亚迪股份有限公司 | Vehicle lamp synchronous control method and device, storage medium and vehicle lamp |
| CN111163568B (en) * | 2018-11-06 | 2021-06-18 | 比亚迪半导体股份有限公司 | Vehicle lamp synchronous control method and device, storage medium and vehicle lamp |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110622 Termination date: 20141122 |
|
| EXPY | Termination of patent right or utility model |