CN1787714A - Ballast of random noise and sawtooth wave composite frequency modulation for gold halogen lamp - Google Patents
Ballast of random noise and sawtooth wave composite frequency modulation for gold halogen lamp Download PDFInfo
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- CN1787714A CN1787714A CNA2005100611557A CN200510061155A CN1787714A CN 1787714 A CN1787714 A CN 1787714A CN A2005100611557 A CNA2005100611557 A CN A2005100611557A CN 200510061155 A CN200510061155 A CN 200510061155A CN 1787714 A CN1787714 A CN 1787714A
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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
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
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Abstract
This invention relates to a metal-halogen lamp ballast with the frequency modulated compositely by random noise and saw-tooth wave including an EMI, a primary supply commutation circuit, APFC and a DC supply, a self oscillation pulse generator, a half or total bridge driver, a half or total bridge switch inverter and a start up circuit of a control circuit characterizing in also including a random noise generator, a saw wave generator and an abnormal test protection circuit, in which, the double property of the rough tune of periodically changed saw-tooth wave and the fine tune of random noise disturbance changes around the central frequency to suppress the lamp discharging arcs to be unable to form stationary waves to avoid sound resonance and floating arc.
Description
Technical field
The present invention relates to the energy-saving electric light source technology of high intensity gas discharge HID metal halide lamp field, specifically is the Metal halogen lamp ballast of a kind of random noise and sawtooth wave composite frequency modulation.
Background technology
Metal halide lamp is belong to high intensity gas discharge HID lamp a kind of, because the halogen (as sodium iodide, thallium, scandium) in the Metal halogen lamp can make metallic atom fully concentrated in vaporization, compare with mercury lamp that the spectrum colo(u)r streak will increase in red color area and yellow region, photochromic better, approach the light of incandescent lamp, and light efficiency reaches 80-125lm/w, be higher than incandescent lamp, mercury lamp, fluorescent lamp, become " green illumination ", can be widely used in the illumination that market, supermarket, hotel, restaurant, exhibition room etc. are located.High intensity discharge Metal halogen lamp operate as normal is high to the specification requirement of its ballast, especially the Metal halogen lamp that power is bigger is higher to its ballast specification requirement, its difficulty is far away from being higher than electronic ballast for fluoresent lamp, the problem that in fluorescent lamp, does not have appearance, and when Metal halogen lamp high frequency power of fixed frequency is worked, " acoustic resonance " problem is the most worried, perplexing the opportunity of putting on market, in use light tube electric voltage can rise suddenly, the electrical discharge arc instability appears in electric arc distortion flicker, gently then makes the light shake, heavy then the electric arc instability causes blow-out, sharply rise with voltage rising electric current and to burn fluorescent tube.Studying its reason is that the wave impulse of fluorescent tube internal pressure is returned from the tube wall internal reflection, when with the same frequency same-phase of lamp high-frequency current harmonic components, can form standing wave, produce sound wave toot vibration altogether, what size of its resonance frequency and arc lamp tube is closely related, and frequency is not single, and it comprises all frequencies of first-harmonic and high order harmonic component.Get single-frequency periodic signal frequency modulation high-frequency pulse oscillator in the prior art, impulse hunting is changed by FM signal suppress the lamp electric arc tube with the formation of standing wave frequently, it is fast because the FM signal cyclic variation is big, moment light shake even blow-out also have generation, therefore FM signal speed is placed restrictions on by it, improve the impulse hunting frequency and then increase circuit power consumption, when adopting the low-frequency square-wave power work, when the Metal halogen lamp level is lighted electric arc can on drift near fluorescent tube, cause the tube wall temperature rise, its quartz ampoule folding crystalline substance that turns white burns out fluorescent tube, awaits deeply and raising so suppress Metal halogen lamp acoustic resonance technology.In addition, Metal halogen lamp triggers start-up course fluorescent tube and ballast is easily caused damage, and this is that impulsive force is big owing to the discharging current high density, gas discharge electric arc instability, and power supply is short of due to the constant output characteristic.Owing to Metal halogen lamp is operated under the technical conditions of high-intensity discharge, reliability service requires high, is important to its abnormal state detection protection, needs raising and perfect.
Summary of the invention
The purpose of this invention is to provide to strengthen and suppress high frequency electric source metal halide high-intensity gas discharge lamp electric arc tube formation standing wave and a kind of random noise of acoustic resonance and the Metal halogen lamp ballast of sawtooth wave composite frequency modulation take place.
The technology of the present invention solution; it is provided with and suppresses power supply Electromagnetic interference filter EMI11; main power source rectification circuit 12; the DC power supply 14 of active power factor pre-adjustment converter APFC13 and control circuit thereof; self-oscillation pulse generator IC3; half-bridge or full bridge driver IC4; half-bridge or full-bridge inverter 5; start-up circuit 6; it is characterized in that: it also is provided with random noise generator 2; saw-toothed wave generator 1; lamp load abnormal current testing circuit 9; inverter power pipe overtemperature prote circuit 10; inverter abnormal voltage testing circuit 7; monostable triggers timer 8; the connection of this Metal halogen lamp ballast circuit is to suppress power supply Electromagnetic interference filter EMI11 in electrical network inlet wire serial connection; main power source rectification circuit 12; insert active power factor pre-adjustment converter APFC13 then; direct current feedback through converter output connects half-bridge or full-bridge inverter 5; control circuit DC power supply 14 is in the rectification of APFC converter 13 boost inductors coupling high frequency voltage; self-oscillation pulse generator IC3 is received in voltage stabilizing; half-bridge or full bridge driver IC4; saw-toothed wave generator 1; monostable triggers timer 8; lamp load abnormal current testing circuit 9; inverter power pipe overtemperature prote circuit 10; the power end of inverter abnormal voltage testing circuit 7, the FREQUENCY CONTROL R of self-oscillation pulse generator IC3 is inserted in the output stack back of the output of random noise generator 2 and saw-toothed wave generator 1
TEnd, the input of half-bridge or full bridge driver IC4 is connected with the output of self-oscillation pulse generator IC3, the input of its output and half-bridge or full-bridge inverter 5 is joined, start-up circuit 6 inserts the output of half-bridge or full-bridge inverter 5, and access lamp load abnormal current testing circuit 9, monostable triggers the trigger end and the lamp load abnormal current testing circuit 9 of timer 8, inverter power pipe overtemperature prote circuit 10, the output of inverter abnormal voltage testing circuit 7 joins, the output that monostable triggers timer 8 inserts half-bridge or full bridge driver IC4 contactor control end, APFC13 output of active power factor pre-adjustment converter and half-bridge or full-bridge inverter 5 outputs connect inverter abnormal voltage testing circuit 7, the output of half-bridge or full-bridge inverter 5 also is connected to the input of random noise generator 2, and inverter 5 power tubes are closely pasted thermistor to be over-temperature sensor and to insert protective circuit 10;
And random noise generator 2, it is to be coupled by the output signal that voltage stabilizing didoe oppositely inserts through RC capacitance-resistance series network and half-bridge or full-bridge inverter, electric resistance partial pressure, detection rectification, filtering output dc voltage, one termination power of voltage stabilizing didoe, and connect low-pass filter network, noise output inserts the amplifier voltage follower, this pipe other end ground connection;
Saw-toothed wave generator, it is to be obtained through integrating circuit by square-wave oscillator output serial connection half-wave rectifying circuit, or by the time base IC circuit be connected into no stable state multi resonant square-wave oscillator, on its timing resistor branch road, insert the amplifier voltage follower, export sawtooth signal;
Lamp load abnormal current detector 9 is to insert monostable by the lamp load current transformer through wave detector, voltage comparator output to trigger timer 8 trigger ends; Inverter abnormal voltage testing circuit 7 is to insert monostable triggering timer 8 trigger ends by APFC output again through electric resistance partial pressure and half-bridge or full-bridge inverter output after peak detection inserts rc delay network, bidirectional trigger diode, electronic switch; Inverter power pipe overtemperature prote circuit 10 is to insert monostable by the thermistor bridge on the power switch pipe that closely sticks in half-bridge or the full-bridge inverter through the output of amplifier voltage comparator to trigger timer 8 trigger ends, and its monostable triggers the output access half-bridge of timer or the contactor control end of full bridge driver IC.
The technical program design is the output frequency of random noise and sawtooth wave composite frequency modulation self-oscillation pulse generator IC, sawtooth period changes coarse adjustment and random noise disturbance fine tuning double grading changes around centre frequency, suppress the acoustic resonance point, can't form once more, make its Metal halogen lamp luminous stable, the flicker free phenomenon is eliminated significantly improving of acoustic resonance; Power supply adopts APFC active power factor pre-adjustment circuit lamp current crest than significantly reducing, and has greatly improved the stability of modulating voltage and lamp current, and it can be worked on permanent power stability ground, the inhibition lamp arc that wafts.In addition; the lamp load current anomaly is set detects protective circuit; inverter power pipe overtemperature prote circuit, inverter abnormal voltage testing circuit greatly improve and improve Metal halogen lamp operate as normal reliability; can cut off circuit protection to the power device of inverter overtemperature is not damaged it; situations such as lamp holder loose contact, fluorescent tube ageing failure can restart in an amount of discontinuity power supply, can't start in the regular hour; then quit work automatically, guard lamp and ballast are not suffered a loss.
Description of drawings
Fig. 1 is a principle of the invention block diagram.
Fig. 2 is random noise of the present invention and sawtooth wave composite frequency modulation modulation signal generator circuit.
With reference to Fig. 1; it is provided with and suppresses power supply EMI FILTER EMI11; main power source rectification circuit 12; the dc source 14 of active power factor pre-adjustment converter APFC13 and control circuit thereof; self-oscillation impulse generator IC3; half-bridge or full bridge driver IC4; half-bridge or full-bridge inverter 5; start-up circuit 6; it is characterized in that: it also is provided with random noise generator 2; saw-toothed wave generator 1; lamp load abnormal current testing circuit 9; inverter power pipe Overtemperature protection circuit 10; inverter abnormal voltage testing circuit 7; monostable trigger timer 8; the connection of this Metal halogen lamp ballast circuit is to suppress power supply EMI FILTER EMI11 in electrical network inlet wire serial connection; main power source rectification circuit 12; insert then active power factor pre-adjustment converter APFC13; direct current feedback through converter output connects half-bridge or full-bridge inverter 5; control circuit dc source 14 is in the rectification of APFC converter 13 boost inductors coupling high frequency voltage; self-oscillation impulse generator IC3 is received in voltage stabilizing; half-bridge or full bridge driver IC4; saw-toothed wave generator 1; monostable trigger timer 8; lamp load abnormal current testing circuit 9; inverter power pipe Overtemperature protection circuit 10; the power end of inverter abnormal voltage testing circuit 7, the FREQUENCY CONTROL R of access self-oscillation impulse generator IC3 after the output stack of the output of random noise generator 2 and saw-toothed wave generator 1TEnd, the input of half-bridge or full bridge driver IC4 Be connected its output and half-bridge or full-bridge inverting with the output of self-oscillation impulse generator IC3 The input of device 5 is joined, and start-up circuit 6 inserts the output of half-bridge or full-bridge inverter 5, and Insert lamp load abnormal current testing circuit 9, the trigger end of monostable trigger timer 8 and lamp Load abnormal current detection circuit 9, inverter power pipe Overtemperature protection circuit 10, inverter The output of abnormal voltage testing circuit 7 joins, and the output of monostable trigger timer 8 connects Enter half-bridge or full bridge driver IC4 contactor control end, the active power factor pre-adjustment becomes Parallel operation APFC13 output and half-bridge or full-bridge inverter 5 outputs connect the inspection of inverter abnormal voltage Slowdown monitoring circuit 7, the output of half-bridge or full-bridge inverter 5 also are connected to the defeated of random noise generator 2 Enter end, it is over-temperature sensor and access protection that inverter 5 power tubes are closely pasted thermistor Circuit 10.
Self-oscillation impulse generator IC chip pin RTEnd and CTEnd is the timing controlled end, and external suitable RC Resistor-Capacitor Unit can be controlled its oscillating impulse frequency, changes R based on this principle utilizationTEquiva lent impedance can change frequency of oscillation, and input random noise and sawtooth period become The composite signal of changing is modulation voltage, changes the purpose that its equivalent resistance reaches frequency modulation, makes it The variation that is directly proportional with modulation voltage of IC output instantaneous angular frequency, modulation voltage is more big, frequency-modulated wave Maximum frequency deviation just more big, coefficient of frequency modulation and modulating frequency are inversely proportional to, so get modulating frequency Low noise and sawtooth waveforms obtain bigger coefficient of frequency modulation and suppress Metal halogen lamp electric arc standing wave sound altogether Shake. Adopt the compatible frequency modulation function of general self-oscillation impulse generator IC chip cheap, Be conducive to reduce the ballast cost.
Fig. 2 is random noise and sawtooth wave composite frequency modulation modulation signal generator, and it is by surely Press diode VD2 oppositely to insert through Resistor-Capacitor Unit R9, C6 series network and half-bridge or full-bridge The coupling of the output signal of switching inverter 5, resistance R 9, R8 dividing potential drop by VD1 detection rectification, The output dc voltage that C5 filtering forms, the termination power of Zener diode VD2, in addition One end ground connection, the output of noise generator 2 are inserted amplifier voltage follower IC2. Sawtooth waveforms is sent out Give birth to device 1 employing 555 o'clock bases IC1 circuit and R1, R2, R3, C2, C3 and be connected into nothing surely Attitude multi resonant square-wave oscillator, its output inserts amplifier voltage follower IC2 by C1, R4 Extract sawtooth signal, the saw-toothed oscillator frequency f0Depend on R1, R2, R3, C3, R1=R2, R3 can make the negative sense velocity of discharge of waveform slack-off, improve the linearity, and C3 is sawtooth Formation electric capacity, C1 is the coupling capacitance of Voltage Feedback, this saw-toothed oscillator overcomes usually Constant-current source be subjected to temperature to the impact of frequency, wave distortion＜%1, voltage follow to capacitor charging Device plays impedance transformation, is output as Low ESR.
Noise source is to utilize back-biased Zener diode VD2 to be operated in avalanche condition among the figure Produce, this noise can be thought stably normal distribution random process, and average is zero, Frequency spectrum is broadband noise, is in lower frequency ranges because the inhibition sound wave is total to toot vibration, so Its output circuit connects low pass wave network attenuates high frequencies, and it and sawtooth period signal superpose Be the composite frequency modulation modulation signal, in the overlapping random noise of sawtooth period variable signal, both protected Hold sawtooth period signal single-frequency frequency modulation one way linear change and make original spy of its frequency lifting The property, coarse adjustment suppresses lamp electric arc accumulation energy, and the trickle disturbance characteristic of random noise carefully presses down Make each resonance point, make its Metal halogen lamp stable luminescence, the flicker free phenomenon, at random dual with the cycle Characteristic strengthens the successful that suppresses acoustic resonance and improves.
Quote the high-frequency fm signal of the resonant tank of switching inverter circuit 5 outputs, the detection electricity Press reverse breakdown Zener diode VD2 to produce random noise, essence is a negative feedback closed loop Control system not only can greatly improve modulation sensitivity, and job stability is very high.
Active power factor pre-adjustment converter APFC13, basic circuit is by the main power source rectification The output of circuit is connected to the multiplier of fixed frequency average current type current booster converter IC chip and gets Sample resistance inserts through boost inductor, power switch pipe, high-frequency diode, output capacitance The error sampling resistance of converter IC chip, the current sampling resistor of converter IC chip is Be serially connected between the source electrode of the negative pole of main power source rectification circuit output and power switch pipe power The grid of switching tube connects converter IC chip driver output.
Active power factor pre-adjustment converter is operated in the average current under the fixed frequency mode Type APFC circuit energy decrease current spike is suitable for high-power high-intensity-gas The Metal halogen lamp ballast of discharge HID, the positive role that active APFC main circuit is wanted is energy Improve the power factor compensation electrical network, and have the function of the pre-voltage stabilizing of output voltage. At the electrical network electricity Press when changing significantly or the starting ignition of ballast lamp, arc discharge are impacted, based on APFC The output voltage of circuit is stable, can make electric ballast high frequency conversion circuit have good Working environment keeps power of lamp tube constant, guarantees the stable of electrical discharge arc. Simultaneously, also subtract The voltage stress of light electron ballast circuit components and parts.
Lamp load current anomaly reflection lamp and ballast break down, analyzing a large amount of fault cases, to be higher than 70% be that the inverter power switching tube damages and to cause, therefore, the lamp load overcurrent generation that prevents the ballast abnormality state is overheated, and it is very important that the detection of lamp load abnormal current, the detection of inverter high-power switchgear device overtemperature and inverter abnormal voltage detection raising ballast reliability are set.
The tested abnormal current signal triggering of the present invention monostable timing device through the output of time delayed turn-off half-bridge or full bridge driver, promptly stops the work of ballast, and protection device is not lost by it; Equally, utilize the power device overtemperature signal of thermistor sensing to pass through the amplifier voltage ratio, reach set point and trigger the monostable timing device, turn-off half-bridge or full bridge driver, realize overtemperature prote; It is to improve the defencive function of abnormality and improve the lamp restart facility that the input/output voltage of setting up inverter detects.When ballast or Metal halogen lamp break down or run into various abnormality, promptly trigger an amount of contactor of regularly opening or turn-off half-bridge or full bridge driver again of monostable flipflop, to start or the protective circuit device is avoided loss.
Specific implementation method
The embodiment of the invention 1; be provided with and suppress power supply Electromagnetic interference filter EMI11; main power source rectification circuit 12; the DC power supply 14 of active power factor pre-adjustment converter APFC13 and control circuit thereof; self-oscillation pulse generator IC3; half-bridge or full bridge driver IC4; half-bridge or full-bridge inverter 5; start-up circuit 6; it is characterized in that: it also is provided with random noise generator 2; saw-toothed wave generator 1; lamp load abnormal current testing circuit 9; inverter power pipe overtemperature prote circuit 10; inverter abnormal voltage testing circuit 7; monostable triggers timer 8; the connection of this Metal halogen lamp ballast circuit is to suppress power supply Electromagnetic interference filter EMI11 in electrical network inlet wire serial connection; main power source rectification circuit 12; insert active power factor pre-adjustment converter APFC13 then; direct current feedback through converter output connects half-bridge or full-bridge inverter 5; control circuit DC power supply 14 is in the rectification of APFC converter 13 boost inductors coupling high frequency voltage; self-oscillation pulse generator IC3 is received in voltage stabilizing; half-bridge or full bridge driver IC4; saw-toothed wave generator 1; monostable triggers timer 8; lamp load abnormal current testing circuit 9; inverter power pipe overtemperature prote circuit 10; the power end of inverter abnormal voltage testing circuit 7, the FREQUENCY CONTROL R of self-oscillation pulse generator IC3 is inserted in the output stack back of the output of random noise generator 2 and saw-toothed wave generator 1
TEnd; the input of half-bridge or full bridge driver IC4 is connected with the output of self-oscillation pulse generator IC3; the input of its output and half-bridge or full-bridge inverter 5 is joined; start-up circuit 6 inserts the output of half-bridge or full-bridge inverter 5; and access lamp load abnormal current testing circuit 9; monostable triggers the trigger end and the lamp load abnormal current testing circuit 9 of timer 8; inverter power pipe overtemperature prote circuit 10; the output of inverter abnormal voltage testing circuit 7 joins; the output that monostable triggers timer 8 inserts half-bridge or full bridge driver IC4 contactor control end; APFC13 output of active power factor pre-adjustment converter and half-bridge or full-bridge inverter 5 outputs connect inverter abnormal voltage testing circuit 7; the output of half-bridge or full-bridge inverter 5 also is connected to the input of random noise generator 2, and inverter 5 power tubes are closely pasted thermistor to be over-temperature sensor and to insert protective circuit 10.
The present embodiment power output is 400w, adopts the output of half-bridge driver and half-bridge inverter high-frequency impulse frequency-modulated wave, Metal halogen lamp ballast centre frequency f
0Be 56.2kHz, the modulating frequency random noise upper frequency limit of modulation signal fm is ended scope about 250Hz, the sawtooth waveforms frequency is 180Hz, the frequency deviation Δ f of composite frequency modulation is ± 2.5kHz, the frequency-modulated wave modulation signal changes around centre frequency with the cycle double grading at random, both kept sawtooth period signal single-frequency frequency modulation one way slope to make its frequency liter, the primary characteristic of falling, coarse adjustment suppresses the lamp arc and forms standing wave, the fine tuning of random noise disturbance characteristic greatly strengthens inhibition acoustic resonance point, even the Metal halogen lamp discharge arc tube is axial, the natural resonance frequency of radial dimension comprises that first-harmonic and high order harmonic component frequency form standing wave, the frequency modulation characteristic of the trickle disturbance of random noise can carefully suppress to make it can't accumulation energy, and, nonperiodic signal is not repeated at random, repeating collision probability with electric arc tube acoustic resonance frequency with frequency is zero, therefore, it is further strengthened to avoid taking place the acoustic resonance effect, and effect is obvious.
Because power supply adopts active power factor pre-adjustment boosting inverter technology APFC; the line voltage scope is when 85～270V; VD is constant to be 385V; adapt to global line voltage and use, the PWM oscillator frequency in the APFC chip is 100kHz, system power factor λ 〉=0.99; the total harmonic distortion THD of input source current＜5%; the Metal halogen lamp ballast satisfies startup, igniting, transient process, abnormal protection, and steady operation has permanent power characteristics.
The embodiment of the invention 2, technical scheme is identical with the embodiment of the invention 1, and adopting half-bridge driver and half-bridge inverter high-frequency impulse is the frequency-modulated wave output of carrier frequency, this Metal halogen lamp ballast output power 250w, average frequency f
0Be 65kHz, the modulating frequency random noise upper frequency limit of modulation signal fm is ended scope about 200Hz, the sawtooth waveforms frequency is 150Hz, the frequency deviation Δ f of composite frequency modulation is ± 2.8kHz, the frequency-modulated wave modulation signal reaches the cycle at random around centre frequency and changing, can strengthen suppress standing wave and avoid forming with same-phase frequently, use through long-term that to eliminate acoustic resonance stable, reliable with electric arc tube, stop moment light dodge tremble, the bad phenomenon of blow-out.Dc voltage stability based on the output of APFC circuit can make electric ballast high frequency conversion circuit that good working environment is arranged, and keeps power of lamp tube constant, guarantees the stable of electrical discharge arc.Simultaneously, also alleviate the voltage stress of circuit of electronic ballast components and parts.
The embodiment of the invention 3, technical scheme is identical with the embodiment of the invention 1, and difference just adopts full bridge driver and full-bridge inverter to be the output of high frequency frequency-modulated wave, this Metal halogen lamp ballast output power 1000w, average frequency f
0Be 29kHz, the modulating frequency random noise upper frequency limit of modulation signal fm is ended scope about 190Hz, the sawtooth waveforms frequency is 160Hz, the frequency deviation Δ f of composite frequency modulation is ± 2.7kHz, the frequency-modulated wave modulation signal changes around centre frequency with the cycle double grading at random, improve and suppress lamp arc accumulation energy, the positive role of avoiding acoustic resonance to play very well.Set abnormality detection protective circuit; the lamp load abnormal current detects, the input/output voltage of inverter detects the defencive function and the restart function that can improve abnormality; when situations such as lamp holder loose contact, fluorescent tube ageing failures; can an amount of discontinuity power supply restart; in the regular hour, can't start, then quit work automatically, thereby guard lamp and ballast are not suffered a loss; even have a power failure at short notice, can restart and light illumination once more.Inverter high-power switchgear device overtemperature automatic shutdown circuit stops its work protection and is not damaged.
Claims (4)
1. the Metal halogen lamp ballast of random noise and sawtooth wave composite frequency modulation; be provided with and suppress power supply Electromagnetic interference filter EMI; the main power source rectification circuit; the DC power supply of active power factor pre-adjustment converter APFC and control circuit thereof; self-oscillation pulse generator IC; half-bridge or full bridge driver IC; half-bridge or full-bridge inverter; start-up circuit; it is characterized in that: it also is provided with random noise generator; saw-toothed wave generator; lamp load abnormal current testing circuit; inverter power pipe overtemperature prote circuit; inverter abnormal voltage testing circuit; monostable triggers timer; the connection of this Metal halogen lamp ballast circuit is to suppress power supply Electromagnetic interference filter EMI in electrical network inlet wire serial connection; the main power source rectification circuit; insert active power factor pre-adjustment converter APFC then; direct current feedback through converter output connects half-bridge or full-bridge inverter; the control circuit DC power supply is in the rectification of APFC converter boost inductor coupling high frequency voltage; self-oscillation pulse generator IC is received in voltage stabilizing; half-bridge or full bridge driver IC; saw-toothed wave generator; monostable triggers timer; lamp load abnormal current testing circuit; inverter power pipe overtemperature prote circuit; the power end of inverter abnormal voltage testing circuit, the FREQUENCY CONTROL R of self-oscillation pulse generator IC is inserted in the output of random noise generator and the output of saw-toothed wave generator stack back
TEnd; the input of half-bridge or full bridge driver IC is connected with the output of self-oscillation pulse generator IC; the input of its output and half-bridge or full-bridge inverter is joined; start-up circuit inserts the output of half-bridge or full-bridge inverter; and access lamp load abnormal current testing circuit; monostable triggers the trigger end and the lamp load abnormal current testing circuit of timer; inverter power pipe overtemperature prote circuit; the output of inverter abnormal voltage testing circuit joins; monostable triggers the output access half-bridge of timer or the contactor control end of full bridge driver IC; APFC output of active power factor pre-adjustment converter and half-bridge or full-bridge inverter output connect inverter abnormal voltage testing circuit; the output of half-bridge or full-bridge inverter also is connected to the input of random noise generator, and the inverter power pipe is closely pasted thermistor to be over-temperature sensor and to insert protective circuit.
2. according to the Metal halogen lamp ballast of claims 1 described a kind of random noise and sawtooth wave composite frequency modulation, it is characterized in that: random noise generator, it is to be coupled by the output signal that voltage stabilizing didoe oppositely inserts through RC capacitance-resistance series network and half-bridge or full-bridge inverter, the direct voltage of electric resistance partial pressure, detection rectification, filtering output, one termination power of voltage stabilizing didoe, other end ground connection, noise output inserts the amplifier voltage follower through low-pass filter network.
3. according to the Metal halogen lamp ballast of claims 1 described a kind of random noise and sawtooth wave composite frequency modulation, it is characterized in that: saw-toothed wave generator, it is to be obtained through integrating circuit by square-wave oscillator output serial connection half-wave rectifying circuit, or be connected into no stable state multi resonant square-wave oscillator by time base IC circuit, insert the amplifier voltage follower and extract sawtooth signal on its timing resistor branch road, the sawtooth signal of output and noise signal insert self-oscillation pulse generation R through the amplifier voltage follower
TEnd.
4. according to the Metal halogen lamp ballast of claims 1 described a kind of random noise and sawtooth wave composite frequency modulation, it is characterized in that: lamp load abnormal current detector is to insert monostable by the lamp load current transformer through wave detector, voltage comparator output to trigger the timer trigger end; Inverter abnormal voltage testing circuit is to insert monostable triggering timer trigger end by APFC output again through electric resistance partial pressure and half-bridge or full-bridge inverter output after peak detection inserts rc delay network, bidirectional trigger diode, switching circuit; Inverter power pipe overtemperature prote circuit is to insert monostable by the thermistor bridge on the power switch pipe that closely sticks in half-bridge or the full-bridge inverter through the output of amplifier voltage comparator to trigger the timer trigger end, and its monostable triggers the output access half-bridge of timer or the contactor control end of full bridge driver IC.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100611557A CN100515155C (en) | 2005-10-15 | 2005-10-15 | Ballast of random noise and sawtooth wave composite frequency modulation for gold halogen lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100611557A CN100515155C (en) | 2005-10-15 | 2005-10-15 | Ballast of random noise and sawtooth wave composite frequency modulation for gold halogen lamp |
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| Publication Number | Publication Date |
|---|---|
| CN1787714A true CN1787714A (en) | 2006-06-14 |
| CN100515155C CN100515155C (en) | 2009-07-15 |
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| CNB2005100611557A Expired - Fee Related CN100515155C (en) | 2005-10-15 | 2005-10-15 | Ballast of random noise and sawtooth wave composite frequency modulation for gold halogen lamp |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103354083A (en) * | 2013-07-11 | 2013-10-16 | 京东方科技集团股份有限公司 | Backlight drive circuit and display device |
| CN104950280A (en) * | 2015-06-26 | 2015-09-30 | 国家电网公司 | System for detecting abnormal working conditions of current transformer loop |
| CN117169755A (en) * | 2023-11-02 | 2023-12-05 | 青岛艾诺仪器有限公司 | AC impedance measuring system and measuring method |
-
2005
- 2005-10-15 CN CNB2005100611557A patent/CN100515155C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103354083A (en) * | 2013-07-11 | 2013-10-16 | 京东方科技集团股份有限公司 | Backlight drive circuit and display device |
| CN103354083B (en) * | 2013-07-11 | 2015-06-17 | 京东方科技集团股份有限公司 | Backlight drive circuit and display device |
| US9881589B2 (en) | 2013-07-11 | 2018-01-30 | Boe Technology Group Co., Ltd. | Backlight source driving circuit and display apparatus |
| CN104950280A (en) * | 2015-06-26 | 2015-09-30 | 国家电网公司 | System for detecting abnormal working conditions of current transformer loop |
| CN117169755A (en) * | 2023-11-02 | 2023-12-05 | 青岛艾诺仪器有限公司 | AC impedance measuring system and measuring method |
| CN117169755B (en) * | 2023-11-02 | 2024-01-12 | 青岛艾诺仪器有限公司 | AC impedance measuring system and measuring method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100515155C (en) | 2009-07-15 |
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