CN100546427C

CN100546427C - The Metal halogen lamp ballast of a kind of random noise and triangular wave composite frequency modulation

Info

Publication number: CN100546427C
Application number: CNB2005100611576A
Authority: CN
Inventors: 阮树成
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-10-15
Filing date: 2005-10-15
Publication date: 2009-09-30
Anticipated expiration: 2025-10-15
Also published as: CN1787716A

Abstract

The present invention relates to the energy-saving electric light source technology of high intensity gas discharge HID Metal halogen lamp field, specifically is the Metal halogen lamp ballast of a kind of random noise and triangular wave composite frequency modulation.Be provided with DC power supply, self-oscillation pulse generator, half-bridge or full bridge driver, half-bridge or the full-bridge switch inverter, the start-up circuit that suppress power supply Electromagnetic interference filter EMI, main power source rectification circuit, active power factor pre-adjustment circuit APFC and control circuit, its feature also is provided with random noise generator, triangular-wave generator, abnormality detection protective circuit.This Metal halogen lamp ballast has a triangular wave cycle to be changed coarse adjustment and centers on centre frequency with random noise disturbance fine tuning double grading and change, strengthening inhibition lamp arc makes it can't form standing wave, avoid acoustic resonance and the arc effect of wafing significantly improves, and have constant output characteristic.In situations such as lamp holder loose contact, lamp ageing failures, can obtain corresponding abnormal protection.

Description

The Metal halogen lamp ballast of a kind of random noise and triangular wave composite frequency modulation

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 triangular 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, is 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 triangular wave composite frequency modulation take place.

The technology of the present invention solution; 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; also be provided with random noise generator 2; triangular-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 active power factor pre-adjustment converter APFC13 output connects half-bridge or full-bridge inverter 5; control circuit DC power supply 14 is in the rectification of active power factor pre-adjustment converter APFC13 boost inductor coupling high frequency voltage; self-oscillation pulse generator IC3 is received in voltage stabilizing; half-bridge or full bridge driver IC4; triangular-wave generator 1; monostable triggers timer 8; lamp load abnormal current testing circuit 9; the power end of inverter power pipe overtemperature prote circuit 10 and 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 triangular-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, the output of inverter power pipe overtemperature prote circuit 10 and 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 inverter power pipe overtemperature prote circuit 10;

And random noise generator 2, it is to be coupled by the output that voltage stabilizing didoe oppositely inserts through RC capacitance-resistance series network and half-bridge or full-bridge inverter, the wave detector output voltage of electric resistance partial pressure, one termination power of voltage stabilizing didoe, the other end then connects the RC Resistor-Capacitor Unit of ground connection in parallel, and as the output of noise generator;

Triangular-wave generator 1, be to connect integrating circuit by square-wave oscillator output to obtain, one of them makes square-wave oscillator by double operational IC for it, another makes active integrating circuit, or be connected into no stable state multi resonant square-wave oscillator by time base IC circuit, its output is through passive RC capacitance-resistance integration low-pass network, and output loading is terminated at the FREQUENCY CONTROL R of self-oscillation pulse generator IC by an adjustable resistance or two resistance series connection on it _TEnd, middle-end connects the output of random noise generator 2, lower end ground connection;

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 active power factor pre-adjustment converter APFC13 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 triangular wave composite frequency modulation self-oscillation pulse generator IC, the triangular wave cycle 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 triangular wave composite frequency modulation modulation signal generator circuit

With reference to Fig. 1; be provided with and suppress 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; also be provided with random noise generator 2; triangular-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 active power factor pre-adjustment converter APFC13 output connects half-bridge or full-bridge inverter 5; control circuit dc source 14 is in the rectification of active power factor pre-adjustment converter APFC13 boost inductor coupling high frequency voltage; self-oscillation impulse generator IC3 is received in voltage stabilizing; half-bridge or full bridge driver IC4; triangular-wave generator 1; monostable trigger timer 8; lamp load abnormal current testing circuit 9; the power end of inverter power pipe Overtemperature protection circuit 10 and 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 triangular-wave generator 1_TEnd, the output of the input of half-bridge or full bridge driver IC4 and self-oscillation impulse generator IC3 Be connected, the input of its output and half-bridge or full-bridge inverter 5 is joined, and start-up circuit 6 connects Enter 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 testing circuit 9, inverter The output of power tube Overtemperature protection circuit 10 and inverter abnormal voltage testing circuit 7 mutually Connect, the output of monostable trigger timer 8 inserts half-bridge or full bridge driver IC4 circuit is opened Close control end, the 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, half-bridge or full-bridge inverter 5 Output also be connected to the input of random noise generator 2, inverter 5 power tubes are closely sticking Pasting thermistor is over-temperature sensor and inserts inverter power pipe Overtemperature protection circuit 10.

Self-oscillation impulse generator IC chip pin R_TEnd and C_TEnd 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 utilization_TEquiva lent impedance can change frequency of oscillation, and input random noise and triangular wave cycle 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 triangular wave 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 triangular wave composite frequency modulation modulation signal generator, and it is by surely Press diode VD3 oppositely to insert through Resistor-Capacitor Unit R9, C6 series network and half-bridge or full-bridge The output of switching inverter 5 coupling, resistance R 9, R8 dividing potential drop by VD1, VD2, R7, C5 forms the output voltage of detection, wave filter, the termination power of Zener diode VD3, The other end then connects R6, the C4 Resistor-Capacitor Unit of earth, and as noise generator 2 Output. Triangular-wave generator 1 employing 555 o'clock bases IC circuit and R1, R2, C1, C2 Be connected into no stable state multi resonant square-wave oscillator, its output is low by R3, R4, the passive integration of C3 The pass filter network is triangular wave, and output load resistance can be by an adjustable resistance or two resistance R5, R6 connect, and are terminated at the FREQUENCY CONTROL R of self-oscillation impulse generator IC3 on it_TEnd, Middle-end connects the output of random noise generator 2, lower end ground connection.

Noise source is to utilize back-biased Zener diode VD3 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 load resistance R6 is connected to feed-through capacitor C4 attenuates high frequencies, it and triangular wave cycle Signal is superposed to the composite frequency modulation modulation signal, makes an uproar at random in that triangular wave cycle variable signal is overlapping Sound had both kept triangular wave periodic signal single-frequency frequency modulation trace that its frequency is reduced, and negative journey makes it The primary characteristic that frequency rises, coarse adjustment suppress lamp electric arc accumulation energy, and random noise is thin The perturbation dynamic characteristic carefully suppresses each resonance point, makes its Metal halogen lamp stable luminescence, the flicker free phenomenon, Strengthening the successful that suppresses acoustic resonance with the cycle double grading at random 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 VD3 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; also be provided with random noise generator 2; triangular-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 active power factor pre-adjustment converter APFC13 output connects half-bridge or full-bridge inverter 5; control circuit DC power supply 14 is in the rectification of active power factor pre-adjustment converter APFC13 boost inductor coupling high frequency voltage; self-oscillation pulse generator IC3 is received in voltage stabilizing; half-bridge or full bridge driver IC4; triangular-wave generator 1; monostable triggers timer 8; lamp load abnormal current testing circuit 9; the power end of inverter power pipe overtemperature prote circuit 10 and 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 triangular-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; the output of inverter power pipe overtemperature prote circuit 10 and 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 inverter power pipe overtemperature prote 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 35.3kHz, modulation signal f _mModulating frequency random noise upper frequency limit by scope about 200Hz, the triangular wave frequency is 160Hz, the frequency deviation Δ f of composite frequency modulation is ± 3.5kHz, the frequency-modulated wave modulation signal changes around centre frequency with the cycle double grading at random, both kept the positive and negative round trip slope of triangular wave periodic signal single-frequency frequency modulation 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 76kHz, modulation signal f _mModulating frequency random noise upper frequency limit by scope about 300Hz, the triangular wave frequency is 150Hz, the frequency deviation Δ f of composite frequency modulation is ± 2.6kHz, the frequency-modulated wave modulation signal reaches the cycle at random around centre frequency and changing, can strengthen suppressing standing wave avoids forming with the frequency same-phase with electric arc tube, use through long-term that to eliminate acoustic resonance stable, reliable, 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, modulation signal f _mModulating frequency random noise upper frequency limit by scope about 160Hz, the triangular wave frequency is 120Hz, the frequency deviation Δ f of composite frequency modulation is ± 2.8kHz, 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

1. the Metal halogen lamp ballast of random noise and triangular 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; triangular-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 active power factor pre-adjustment converter APFC output connects half-bridge or full-bridge inverter; the control circuit DC power supply is in the rectification of active power factor pre-adjustment converter APFC boost inductor coupling high frequency voltage; self-oscillation pulse generator IC is received in voltage stabilizing; half-bridge or full bridge driver IC; triangular-wave generator; monostable triggers timer; lamp load abnormal current testing circuit; the power end of inverter power pipe overtemperature prote circuit and 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 triangular-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; the output of inverter power pipe overtemperature prote circuit and 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 inverter power pipe overtemperature prote circuit.

2. the Metal halogen lamp ballast of a kind of random noise according to claim 1 and triangular wave composite frequency modulation, it is characterized in that: random noise generator, it is to be coupled by the output that voltage stabilizing didoe oppositely inserts through RC capacitance-resistance series network and half-bridge or full-bridge inverter, the wave detector output voltage of electric resistance partial pressure, one termination power of voltage stabilizing didoe, the other end then connects the RC Resistor-Capacitor Unit of ground connection in parallel, and as the output of noise generator.

3. the Metal halogen lamp ballast of a kind of random noise according to claim 1 and triangular wave composite frequency modulation, it is characterized in that: triangular-wave generator, it is to be obtained through integrating circuit by square-wave oscillator output, one of them makes square-wave oscillator by double operational IC, another makes active integrating circuit, or be connected into no stable state multi resonant square-wave oscillator by time base IC circuit, its output constitutes through passive RC capacitance-resistance integration low-pass network, output loading is terminated at the FREQUENCY CONTROL R of self-oscillation pulse generator IC by an adjustable resistance or two resistance series connection on it _TEnd, middle-end connects the output of random noise generator, lower end ground connection.

4. the Metal halogen lamp ballast of a kind of random noise according to claim 1 and triangular wave composite frequency modulation 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 active power factor pre-adjustment converter 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.