CN103313495B - Single tube resonant mode light-adjustable gas discharge lamp electronic ballast - Google Patents
Single tube resonant mode light-adjustable gas discharge lamp electronic ballast Download PDFInfo
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Abstract
The present invention relates to a kind of light-adjustable gas discharge lamp electronic ballast, adopt the overall power conversion scheme handing over (AC)-straight (DC)-friendship (AC).Inverter circuit mainly comprises isolating diode VD5, inductance L 2 and electric capacity C3 and is connected in parallel the LC resonant network of composition, a switching tube VT0 and flyback diode VD0, lamp load FZ series capacitance C20 ballast.Switching tube VT0 adopts the Sofe Switch working method of no-voltage conducting, reach the object of light modulation by the ON time length of pulse-width regulated potentiometer R10 by-pass cock pipe VT0, solve high-intensity gas discharge lamp acoustic resonance problems by the ON time of low frequency modulations switching tube VT0.
Description
Technical field
The invention provides a kind of brand-new single tube resonant mode light-adjustable gas discharge lamp electronic ballast, relate to the electronic amperite of gas-discharge lamp technical field of transformation of electrical energy, its LC resonant network works in resonance condition, main circuit only has a switching tube, is reached lamp load light modulation and the object eliminating acoustic resonance by the ON time length of regulating and controlling main circuit switch pipe.
Background technology
The application that gaseous discharge lamp significantly obtains widely because of energy-saving effect, existing electronic amperite of gas-discharge lamp adopts transformation of electrical energy technology, under the coordination of several switching tubes drives, produce the load of high-frequency electrical energy gas discharge lamp, its main circuit comprises multiple switching tube and inductance coil, cause circuit structure complicated, materials are a lot, cost is high, because being not easy to control respectively each switching tube, so existing a lot of electronic amperite of gas-discharge lamp technical scheme does not have the feasibility to lamp light modulation, those have the electric ballast of dimming function to make circuit structure very complicated because of the constraint by self-technique scheme, cost is very high, expensive, special in the high-intensity gas discharge lamp having acoustic resonance problems, its circuit of electronic ballast structure is very complicated especially, cost and bringing a high price.
Summary of the invention
According to above the deficiencies in the prior art, the technical problem to be solved in the present invention is: provide a kind of structure simple, be convenient to the single tube resonant mode light-adjustable gas discharge lamp electronic ballast that controls, cost is low.
The present invention solves the scheme that its technical problem adopts: gaseous discharge lamp electric capacity ballast, this electric capacity and gaseous discharge lamp are serially connected in a branch road, this branch circuit parallel connection is connected in parallel the LC resonant network of composition to resonant inductance and resonant capacitance, make lamp load as the load of LC resonant network, LC resonant network is connected with a switching tube, switching tube adopts the Sofe Switch working method of no-voltage conducting, LC resonant network only accepts the input of electric energy in switching tube conduction period, maintain the persistent oscillation of LC resonant network, the time of switching tube conducting is longer, the electric energy that LC resonant network accepts is more, the electric current and voltage amplitude that its resonance produces is larger, cycle is longer, power output is more, and power output is how many and the nominal rating power of lamp load has nothing to do, LC resonant network works in underdamping resonance condition, its output voltage amplitude is very high, this magnitude of voltage is enough to light gaseous discharge lamp, the object of light modulation is reached by the length of by-pass cock pipe ON time, by the low frequency modulations of switch tube ON time to solve the acoustic resonance problems of high-intensity gas discharge lamp.
The present invention also adopts the power conversion scheme of AC-DC-AC, namely first the electric main rectifying conversion of input is become direct current, then this DC inverter is become the high-frequency alternating current for lamp load, and it comprises main circuit and control circuit generally.
In the present invention, the electric main of input is converted to direct current by diode bridge rectifier circuit and filtering, circuit of power factor correction, and this direct current is converted to high-frequency alternating current for lamp load by inverter circuit below.
The inverter circuit that the present invention adopts uses brand-new version, it is characterized by: be connected in parallel composition LC resonant network with a resonant inductance and a resonant capacitance, switching tube is connected between LC resonant network and ground (reference potential), the other end of LC resonant network is connected an isolating diode, and the negative pole of isolating diode connects one end of LC resonant network, in LC resonant network oscillatory process, its terminal voltage peak value can higher than the voltage to earth value after rectifying and wave-filtering, now switching tube can bear reverse voltage, and the reverse voltage endurance of the switching tube relying on prior art to produce is very limited, too high reverse voltage can cause the damage of switching tube, so to have connected isolating diode at the other end of LC resonant network, when the terminal voltage peak value of LC resonant network is higher than voltage to earth value after rectifying and wave-filtering, this isolating diode ends because of reverse-biased, certainly due to the reason of series connection, isolating diode also can be serially connected between LC resonant network and switching tube, in order to prevent the impact of switch tube and control circuit during this period, flyback diode with switching tube reverse parallel connection, the i.e. negative pole end of the positive pole connecting valve pipe of this two pole, the positive pole of its negative pole connecting valve pipe.
The present invention adopts electric capacity to lamp load ballast, and to reduce costs, this electric capacity is connected with lamp load.
Resonant inductance in LC resonant network is solenoid type inductance or electromagnetic type high frequency transformer; Lamp load branch road is in parallel with LC resonant network or be mounted on the secondary of high frequency transformer.
In order to reduce the wastage, switching tube adopts the Sofe Switch working method of no-voltage conducting, namely the direct voltage of inverter circuit input is equaled in the terminal voltage of resonant capacitance, and pass through the sense of current and its voltage direction moment in the same way of resonant inductance, now the terminal voltage of switching tube is zero, switching tube starts conducting, based on this, control circuit needs the voltage status situation of change in testing circuit, synchronous conducting can be carved at this moment with control switch pipe, in line with simple and reliable principle, the sampled voltage signal of detection feedback required for the present invention takes from the voltage to earth of the positive terminal of switching tube.
During circuit working; switching tube will bear very high crest voltage; the rectifying effect particularly produced in the asymmetric arc discharge of gaseous discharge lamp and later stage in life-span and lamp load fault; this peak voltage is higher; likely switching tube punctured and damage, so switching tube needs to configure excess voltage protection.
The present invention's employing reaches the object to lamp load light modulation by the ON time length of regulating and controlling main circuit switch pipe, carry out low frequency modulations by switch tube ON time and then make the terminal voltage frequency of lamp load be among constantly change, to solve high-intensity gas discharge lamp acoustic resonance problems.
In order to realize effective control of switch tube, in the electronic ballast control circuit of lamp load without acoustic resonance, the control impuls of switching tube produces circuit by driving pulse and produces, driving pulse produces circuit and adopts simple monostable flipflop, it is by the triggering of arbitrary output pulse in high-frequency impulse start-up circuit and sampling feedback voltage signal circuit, regulate the output pulse width of monostable flipflop with pulse-width regulated potentiometer, reach the object of light modulation.
The basis of above-mentioned control circuit increases pulsewidth low frequency modulations link, just can solve high-intensity gas discharge lamp acoustic resonance problems, it is also a monostable flipflop that voltage-controlled width pulse produces circuit, but the signal voltage value that its output pulse width is inputted by resistance and the voltage controling end of pulse-width regulated potentiometer determines jointly, circuit for generating triangular wave produces symmetrical low frequency triangular signal, voltage-controlled width pulse produces the pulse duration of circuit by this low frequency triangle wave modulation, its pulse duration constantly changes centered by the pulsewidth set by pulse-width regulated potentiometer, thus the terminal voltage frequency of lamp load is constantly changed, reach the object eliminating acoustic resonance.
Also delay circuit is provided with, in case driving pulse produces circuit and voltage-controlled width pulse generation circuit is repeated by repeatedly triggering to export pulse in a work period in control circuit.
In order to prevent circuit just started working and chance failure cause circuit to stop oscillation, be provided with high-frequency impulse start-up circuit, for the persistent oscillation of circuit provides starting impulse.
Because switching tube needs larger power drive, and general signal energy is very low, and is not suitable for the control pole of Direct driver switching tube, so be provided with switch tube driving circuit.
The beneficial effect that single tube resonant mode light-adjustable gas discharge lamp electronic ballast of the present invention has is: with relatively low voltage starting lamp load, lamp electrode is not almost consumed in start-up course, in addition high-frequency drive is adopted, effectively extend the life-span of lamp, improve light efficiency, energy-saving effect is remarkable; The conversion of electric energy only adopts a switching tube, and the structure of circuit is simple, and its regulating and controlling is flexibly easy; Switching tube adopts the Sofe Switch working method of no-voltage conducting, and loss is little, and efficiency is high, and working stability is reliable; Copper consumption and other the material usage of circuit are little, and production cost is low, is conducive to promoteing the wider application; Adopt the frequency of supply of the method modulation high-intensity gas discharge lamp of pulse-width modulation, the program solves the acoustic resonance problems of high-intensity gas discharge lamp simply and effectively; The control design case project plan comparison of control circuit is simple, fixing, and the design being conducive to application-specific integrated circuit (ASIC) is produced.
Accompanying drawing explanation
Figure 1 shows that general principles block diagram of the present invention;
Figure 2 shows that the dimmable electronic ballast control circuit functional-block diagram of the gaseous discharge lamp be applicable to without acoustic resonance;
Figure 3 shows that the dimmable electronic ballast control circuit functional-block diagram of the gaseous discharge lamp being applicable to acoustic resonance;
Figure 4 shows that the dimmable electronic ballast embodiment electrical schematic diagram of the gaseous discharge lamp be applicable to without acoustic resonance;
Figure 5 shows that the dimmable electronic ballast embodiment electrical schematic diagram of the gaseous discharge lamp being applicable to acoustic resonance;
Fig. 6, Figure 7 shows that resonant inductance adopts high frequency transformer form and lamp load to be mounted on the secondary schematic diagram of transformer;
Wherein FU1, FU2, fuse VD1 ~ VD16, diode, wherein VD6 is voltage stabilizing didoe VT0, switching tube VT1 ~ VT3, triode L1, inductance L 2, inductance or high frequency transformer C1 ~ C31, electric capacity, wherein C20 is ballast capacitor R1 ~ R18, resistance, and wherein R10 is the power transformer of pulse-width regulated potentiometer FZ, gas discharge lamp load IC1, integrated three-terminal regulator 78L12 IC2, IC5, integrated timer NE555P IC3, IC4, integrated monostable flipflop CD4047 IC6, integrated timer TLC555IP Tr, control circuit;
In addition, L, N represent live wire, the zero line side of power supply respectively; A, B are respectively and are connected in parallel the C pole, two ends of the LC resonant network formed, E pole and G pole by L2 and C3 to be respectively the positive terminal of switching tube VT0, negative pole end and control extreme.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Electronic amperite of gas-discharge lamp is actual is an electrical energy transformer, it provides high-frequency ac electric energy for gaseous discharge lamp, the present invention adopts the conversion scheme of friendship (AC)-straight (DC)-friendship (AC), namely first the electric main rectifying conversion of input is become direct current, again this DC inverter is become the high-frequency alternating current for lamp load, it comprises main circuit and control circuit generally, as shown in Figure 1, its general principles is: electric main inputs bridge rectifier through high-frequency filter circuit, direct current is exported after filter circuit or circuit of power factor correction, the high-frequency alternating current supplied gas discharge lamp that this direct current input high-frequency inverter circuit below obtains tens KHz (KHz) uses, high-frequency filter circuit is used for filtering high order harmonic component, improves circuit power factor, prevents high order harmonic component to the pollution of public electric wire net, bridge rectifier is used for direct current electric main being rectified into pulsation, and filter circuit can reduce this galvanic pulsation, and circuit of power factor correction can make the voltage and current of electric main keep same-phase as far as possible, improves the power factor of circuit.
Lamp load FZ adopts electric capacity C20 ballast, and this ballast capacitor C20 and lamp load FZ is connected in series.See shown in Fig. 4 ~ Fig. 7, wherein R13 is the stored charge bleeder resistance of ballast capacitor C20, circuit can be released electric capacity C20 stored charge after a loss of power in official hour, guarantee personal safety.
The inverter circuit of DC-AC conversion comprises isolating diode, LC resonant network and switching tube etc., as shown in Figure 1, isolating diode, LC resonant network and switching tube are link of connecting successively, by the periodicity conducting of switching tube, power supply constantly provides energy for LC resonant network, to maintain its continual oscillatory process; Excess voltage protection is used for the overvoltage protection of switching tube, prevent switching tube because of overvoltage punch through damage.
In LC resonant network, resonant inductance L2 has solenoid type inductance and solenoid type high frequency transformer two kinds of optional forms, require depending on specific design, if L2 adopts solenoid type inductance, then lamp load FZ should be connected in parallel with LC resonant network, sees shown in Fig. 4 and Fig. 5, according to high frequency transformer, then the branch road after lamp load FZ serial connection ballast capacitor C20 can be connected to the secondary of this transformer, see shown in Fig. 6 and Fig. 7.
Figure 2 shows that the dimmable electronic ballast control circuit functional-block diagram of the gaseous discharge lamp be applicable to without acoustic resonance, its operation principle is: under the state that inverter circuit does not vibrate, high-frequency impulse start-up circuit exports a starting impulse, circuit is produced through triggering driving pulse with door, then driving pulse generation circuit exports a duration is Δ t drive pulse signal, this pulse signal carries out power amplification through switch tube driving circuit, the control pole of switch tube applies control voltage, the conducting of driving switch pipe was closed after the Δ t time, driving pulse produces circuit and also exports to high-frequency impulse start-up circuit the blockade reseting pulse signal that a duration is Δ t simultaneously, high-frequency impulse start-up circuit is resetted and stops exporting starting impulse signal, in switching tube conduction period, the terminal voltage of LC resonant network equals the DC input voitage of inverter circuit, this voltage is to LC resonant network makeup energy, to maintain persistent oscillation, in Δ t finish time time of drive pulse signal, driving pulse produces circuit and sends effectively start pulse to high-frequency impulse start-up circuit and delay circuit, these two circuit are made to start timework, if sampling feedback voltage signal circuit does not also send effective trigger impulse, then high-frequency impulse start-up circuit again sends trigger impulse to driving pulse start-up circuit after timing terminates, otherwise high-frequency impulse start-up circuit by again in the end of drive pulse signal along reclocking, the timing time of high-frequency impulse start-up circuit is much larger than the load terminal voltage wave period time, delay circuit produces to driving pulse the reset signal that circuit sends the lasting certain time-delay time, for preventing driving pulse in a cycle of oscillation from producing circuit by repeated trigger, its delay time is less than time free period of LC resonant network (when band lamp load), in LC resonant network oscillatory process, its terminal voltage is constantly change, the voltage to earth being reflected to the positive terminal of switching tube is also constantly change, sampling feedback voltage signal circuit detects this voltage to earth, switching tube starts conducting when terminal voltage is zero, and conducting after-current flows to negative pole end from the positive terminal of switching tube, the terminal voltage of the resonant capacitance namely now in LC resonant network equals the direct voltage inputted, and identical with its voltage direction now by the sense of current of resonant inductance, pulse-width regulated potentiometer, for the output pulse width Δ t regulating driving pulse to produce circuit, reaches the object of light modulation.
Acoustic resonance is problem specific to high-intensity gas discharge lamp, and the present invention adopts the frequency of the method modulation lamp load terminal voltage of low frequency modulations pulsewidth; The one-period time T of lamp load terminal voltage is the ON time Δ t that the time free period t of LC resonant network adds switching tube, i.e. T=t+ Δ t, corresponding frequency is f=1/T=1/ (t+ Δ t), and t only depends on circuit hardware parameter, fixing, so carry out low frequency modulations to Δ t just can change cycle T and frequency f, also just reach the object that frequency modulation eliminates acoustic resonance.
Figure 3 shows that the dimmable electronic ballast control circuit functional-block diagram of the gaseous discharge lamp being applicable to acoustic resonance, it on the basis of Fig. 2, driving pulse start-up circuit is changed into voltage-controlled width pulse to produce circuit, and add circuit for generating triangular wave; The output driving pulse width Delta t of voltage-controlled width pulse generation circuit depends on resistance and the control voltage value of pulse-width regulated potentiometer, the generation low frequency symmetric triangular ripple signal that circuit for generating triangular wave continues, with this triangular signal as modulation signal, driving pulse is constantly changed centered by the pulsewidth set by pulse-width regulated potentiometer.
According to the above description to general structure of the present invention and operation principle; below the embodiment shown in Fig. 4 and Fig. 5 is explained; in these two figure, wherein do not draw the excess voltage protection of high-frequency filter circuit and switching tube, but this does not affect the elaboration to the present invention program's embodiment.
Figure 4 shows that the dimmable electronic ballast embodiment electrical schematic diagram of the gaseous discharge lamp be applicable to without acoustic resonance, for the lamp load without acoustic resonance as fluorescent lamp, adopt the scheme of fixed power supply frequently, namely the terminal voltage frequency of lamp is without the need to modulation.Diode VD1 ~ VD4 forms bridge rectifier, the electric main of input is rectified into direct current, C1, L1 and C2 form filter network, the direct current that inverter circuit output ripple is rearwards smaller, wherein C1 should adopt as one sees fit, L1 and C2 adopts resonant mode filtering, to reduce circuit volume, improve the continuity of power factor and electric current, this link also can adopt active filter certainly, inductance L 2 and electric capacity C3 are connected in parallel the LC resonant network of composition inverter circuit, isolating diode VD5 and switching tube VT0 is connected in series with LC resonant network respectively, wherein the negative pole of isolating diode VD5 connects the A end of LC resonant network, the positive terminal C pole of switching tube VT0 connects the B end of LC resonant network, E pole ground connection (reference potential) of switching tube VT0, certain isolating diode VD5 also can be connected between LC resonant network and switching tube VT0, its positive pole connects the B end of LC resonant network, the C pole of negative pole connecting valve pipe VT0, flyback diode VD0 and switching tube VT0 reverse parallel connection, the C pole of the negative pole connecting valve pipe VT0 of flyback diode VD0, the E pole of its positive pole connecting valve pipe VT0, resistance R1 and voltage stabilizing didoe VD6 is connected in parallel between the G pole of switching tube VT0 and E pole, damage because of overvoltage G pole in the course of the work to prevent switching tube VT0.
The terminal voltage of definition LC resonant network is u
aB, be i by the electric current of resonant inductance L2
aB, reference direction is all point to B point by A point, and the voltage (i.e. the positive limit voltage to earth of isolating diode VD5) after main circuit rectifying and wave-filtering is u
dC, reference direction is for point to negative pole by positive pole.
Its terminal voltage u in the process of LC resonant network vibration
aBcan higher than u
dCif do not arrange isolating diode VD5, then now LC resonant network is to filter network or power-factor correcting network reverse charging, thus the oscillatory process of damping LC resonant network, shows as its terminal voltage u
aBfor near sinusoidal half-wave voltage, isolating diode VD5 is set and can avoids this phenomenon, and during this period, switching tube VT0 can bear reverse voltage, namely E electrode potential is higher than C electrode potential, this likely causes the damage of switching tube VT0 and produces interference to control circuit, so be provided with flyback diode VD0, flyback diode VD0 is made now to make the C of switching tube VT0 because of positively biased, E voltage across poles is almost nil, although flyback diode VD0 is in positively biased, but due to reverse-biased effective buffer action of isolating diode VD5, in flyback diode VD0, electric current does not pass through, so flyback diode VD0 provide only a voltage path, however, because the reason of parallel connection, the reverse requirement of withstand voltage of flyback diode VD0 should be withstand voltage identical with the forward of switching tube VT0.
Control loop direct voltage will consider in conjunction with the control voltage of control program and switching tube VT0 and determine, the present embodiment adopts 12V, and it is obtained by transformer Tr step-down, diode VD9 ~ VD12 rectification, electric capacity C11 and C10 filtering and integrated three-terminal regulator IC1; Electric capacity C6 is sampling capacitance, it carries out the C pole voltage to earth from switching tube VT0 the sampling feedback voltage signal circuit that the input of step-down current limliting is made up of triode VT3, resistance R6 and diode VD6, effective feedback voltage signal pulse exports from the collector electrode of triode, enters the AND circuit be made up of diode VD8, VD14 and resistance R7; The present embodiment high-frequency impulse start-up circuit is that core forms by integrated timer IC2, and the model of IC2 is NE555P, it from pin 3 export starting impulse to door; With integrated monostable flipflop IC4 for core forms delayer, model is CD4047, and its delay time is determined by resistance R12 and electric capacity C19; With integrated monostable flipflop IC3 for core composition driving pulse produces circuit, model is CD4047, and it exports effective pulsewidth and is determined by pulse-width regulated potentiometer R10, resistance R11 and electric capacity C24.
The pin 6 of triggering signal to IC3 is exported from the positive terminal of diode VD8 and VD14 with door, the reset signal that the pin 4 of IC3 from pin 11 to IC2 exports high-frequency impulse start-up circuit is triggered by this end, export the pulse inversion of pulse and pin 11 from the pin 10 of IC3, the output pulse of pin 10 is divided into two-way: a road enters the drive circuit of the switching tube VT0 be made up of triode VT1, VT2 and resistance R3, R4; Another road enters the pin 6 of IC4, the starting impulse edge of trailing edge as IC4 time delay of pulse is exported with IC3 pin 6, export the high level pulse signal of certain time at once from pin 10 after IC4 is triggered, this signal enters the pin 9 of IC3, make IC3 be blocked reset, make IC3 only have a pulse to export in one cycle.
Switching tube VT0 adopts the Sofe Switch working method of no-voltage conducting, i.e. the conducting when C, E voltage across poles of switching tube VT0 is zero; In resonant inductance L2 and resonant capacitance C3 discharge and recharge oscillatory process, its terminal voltage u
aBconstantly change, the at a time terminal voltage u of resonant capacitance C3
aBequal direct voltage u
dC, current i
aBfor just, research is showing that C, E voltage across poles of now switching tube VT0 is zero, the best time of switching tube VT0 conducting just; At terminal voltage u
aBbe greater than u
dCsection, at u
aBwhen being in its crest voltage, electric capacity C6 is full of electric charge by diode VD7, and its polarity of voltage is left positive right negative, works as u
aBduring crest voltage by it, electric capacity C3 starts to discharge to inductance L 2, starts to occur forward current, u in inductance L 2
aBstart to reduce gradually, the C electrode potential of switching tube VT0 starts continuous rising, electric capacity C6 is discharged by the emitter junction of triode VT3, VT3 saturation conduction, output low level triggering signal, pin 10 through IC3 exports drive pulse signal to the drive circuit of switching tube VT0, and the G pole of switching tube VT0 obtains control voltage, but due to u
aB>u
dCwith the buffer action of isolating diode VD5, switching tube VT0 does not have conducting, only at u
aBcontinue to drop to u
aB=u
dCafter, isolating diode VD5 starts positively biased, and switching tube VT0 just starts conducting; The output pulse moment of visible IC3 is advanced by the regular hour than the turn-on instant of switching tube VT0, so the output pulse width of IC3 must be greater than this time just can make the reliable conducting of switching tube VT0.
LC resonant network, in oscillatory process, can produce very high crest voltage, and particularly when resonant tank loses suddenly the damping of load, this crest voltage is higher, and the maximum voltage that switching tube VT0 bears is u
dCadd u
aBpeak-inverse voltage, so high voltage is breakdown switch pipe VT0 likely, so switching tube VT0 needs overvoltage protection.
Figure 5 shows that the dimmable electronic ballast embodiment electrical schematic diagram of the gaseous discharge lamp being applicable to acoustic resonance, this embodiment is actual is the low frequency circuit for generating triangular wave that to add with integrated timer IC5 on basis embodiment illustrated in fig. 4 be core, and the driving pulse in Fig. 4 with IC2 being core is produced that circuit changes into IC6 is that the voltage-controlled width pulse of core produces circuit, the model of IC5 and IC6 is respectively NE555P and TLC555IP; The Oscillating output waveform cycle of IC5 depends on resistance R16, R17 and electric capacity C29, wherein R16=R17, diode VD6 makes the charging of electric capacity C29, discharge time equal, make IC5 can export symmetrical square wave voltage signal from pin 3, this square-wave voltage exports triangular modulation signal through the integral transformation of resistance R14 and electric capacity C19 to the voltage controling end pin 5 of IC6; Pin 3 output pulse width of IC6 depends on the magnitude of voltage size of resistance R11, pulse-width regulated potentiometer R10, electric capacity C18 and voltage controling end pin 5; Electric capacity C17 is derivative-type coupling capacitance; Triode VT4, resistance R5, R18 and electric capacity C21 form high frequency inverter, to adapt to the requirement of IC2 pin 4 required voltage signal level; Take IC4 as the pin 4 output blockade reset signal of delay circuit from pin 11 to IC6 of core composition, make IC6 only export a pulse in one cycle.
Because high-intensity gas discharge lamp has the specific question of acoustic resonance, common Design of Digital Ballast scheme is not also suitable for high-intensity gas discharge lamp, the method having multiple elimination acoustic resonance is shown according to correlative study, the present invention adopts the method to the frequency of supply of lamp load FZ is modulated to eliminate acoustic resonance, specific to the embodiment shown in Fig. 5, the output center pulse duration of IC6 is set with pulse-width regulated potentiometer R10, it totally determines the power stage of lamp load FZ, so with pulse-width regulated potentiometer R10 light modulation, pin 5 voltage due to IC6 is the triangular signal of constantly change, it makes the continuous correspondence of pin 3 output pulse width of IC6 change, namely pin 3 output pulse width of IC6 constantly changes centered by the pulsewidth set by pulse-width regulated potentiometer R10, its effect is the modulation that pin 3 output pulse width of IC6 is subject to triangle wave voltage signal, and then modulated the ON time of switching tube VT0, indirectly modulate the terminal voltage cycle of lamp load FZ, namely modulate the terminal voltage frequency of lamp load FZ, eliminate acoustic resonance.
The present invention is that the high pressure spot relying on LC resonant network to produce in oscillatory process is lit a lamp load, its output voltage is relatively low, but it is reliably effective, lamp load electrode in start-up course does not significantly sputter, extend the life-span of lamp very significantly, and existing dedicated trigger device, its trigger voltage peak value exported is up to four or five kilovolts, although such high pressure can ensure later stage in the life-span successful ignition lamp at lamp, but electrode sputtering is very violent in the process that lamp starts, the serious useful life that have impact on lamp.
Due to the inherent characteristic of gaseous discharge lamp; the present invention must start completely at lamp load and just can carry out Dimming operation after entering stable normal arc discharge; otherwise lamp can not be made normally to work on the one hand; easily make lamp load be in glow discharge or abnormal arc discharge state on the other hand always, cause lamp load accelerated ageing.
The object more than announcing each integrated circuit model and other circuit parameter understands the specific embodiment of the invention to illustrate better, understands the present invention better by specific embodiment, and certainly, each integrated circuit also has other substitute products.
Certainly, when not departing from framework of the present invention, can also there be other selection and development and we can pre-conceivable equivalent device.
Claims (7)
1. a single tube resonant mode light-adjustable gas discharge lamp electronic ballast, comprises main circuit and control circuit, main circuit comprises high-frequency filter circuit, bridge rectifier, filter circuit or circuit of power factor correction, isolating diode VD5, inductance L 2 and electric capacity C3 are connected in parallel the LC resonant network of composition, lamp load FZ, ballast capacitor C20, switching tube VT0, flyback diode VD0, the excess voltage protection of switching tube VT0 and the accessory power supply needed for control circuit, is characterized in that: high-frequency filter circuit, bridge rectifier, filter circuit or circuit of power factor correction, isolating diode VD5, inductance L 2 and electric capacity C3 are connected in parallel the LC resonant network of composition, switching tube VT0 is link of connecting successively, wherein isolating diode VD5 also can be serially connected between LC resonant network and switching tube VT0, high-frequency filter circuit is used for filtering high order harmonic component, improve circuit power factor, the negative pole of isolating diode VD5 connects one end (A end) of LC resonant network, the positive pole of isolating diode VD5 connects the direct current positive pole of filter circuit or circuit of power factor correction output, the positive terminal C pole of the negative pole connecting valve pipe VT0 of flyback diode VD0, the negative pole end E pole of the positive pole connecting valve pipe VT0 of flyback diode VD0, the extreme G pole of control of switching tube VT0 is connected to control circuit, is controlled by control circuit, at the terminal voltage u of resonant capacitance C3
aBequal the direct voltage u after rectifying and wave-filtering
dC, and pass through the current i of resonant inductance L2
aBdirection is just and the moment identical with its terminal voltage direction, now the c pole of switching tube VT0 and E voltage across poles are zero, switching tube VT0 starts conducting, switching tube VT0 turns off after the conducting regular hour, at switching tube VT0 blocking interval, LC resonant network is in underdamping resonance condition, instead of quasi-resonance state, the excess voltage protection of switching tube VT0 is used for the overvoltage protection of switching tube VT0, prevent switching tube VT0 because of overvoltage punch through damage.
2. single tube resonant mode light-adjustable gas discharge lamp electronic ballast according to claim 1, it is characterized in that: for the gas discharge lamp load not having acoustic resonance, control circuit comprises high-frequency impulse start-up circuit, sampling feedback voltage signal circuit, produces circuit, pulse-width regulated potentiometer, delay circuit, switch tube driving circuit with door, driving pulse, high-frequency impulse start-up circuit is used for providing starting impulse to circuit, circuit is made to start vibration, in switching tube VT0 conduction period, high-frequency impulse start-up circuit is in blockade reset mode, the output signal of high-frequency impulse start-up circuit and sampling feedback voltage signal circuit enters and door, it is a monostable flipflop that driving pulse produces circuit, its pulsewidth is by the regulable control of pulse-width regulated potentiometer, by the triggering with the output pulse of door, delay circuit is also a monostable flipflop, it produces by driving pulse the triggering that circuit output pulse terminates edge, make driving pulse produce circuit and be in of short duration blockade reset mode after output pulse, the control pole of switch tube driving circuit connecting valve pipe VT0, it accepts the pulse signal producing circuit output from driving pulse, excitation driving switch pipe VT0, for the gas discharge lamp load having acoustic resonance, control circuit comprises high-frequency impulse start-up circuit, sampling feedback voltage signal circuit, produces circuit, pulse-width regulated potentiometer, delay circuit, circuit for generating triangular wave, switch tube driving circuit with door, voltage-controlled width pulse, voltage-controlled width pulse produces circuit and circuit for generating triangular wave is special in there being the gas discharge lamp load of acoustic resonance to design, voltage-controlled width pulse produces the triggering that circuit is subject to export with door pulse, the output pulse width of voltage-controlled width pulse generation circuit is subject to the control of pulse-width regulated potentiometer and circuit for generating triangular wave output voltage values, wherein circuit for generating triangular wave exports symmetrical triangle wave voltage signal, output pulse width for producing circuit to voltage-controlled width pulse carries out low frequency modulations, the pulsewidth of this low frequency modulations changes centered by the pulsewidth set by pulse-width regulated potentiometer.
3. single tube resonant mode light-adjustable gas discharge lamp electronic ballast according to claim 1, is characterized in that: lamp load FZ uses electric capacity C20 to carry out ballast, and does not use inductance to carry out ballast, and electric capacity C20 and lamp load FZ is connected in series.
4. single tube resonant mode light-adjustable gas discharge lamp electronic ballast according to claim 1, it is characterized in that: in main circuit, resonant inductance L2 in LC resonant network is solenoid type inductance or solenoid type high frequency transformer, lamp load FZ branch road is in parallel with LC resonant network, or is mounted on the secondary of solenoid type high frequency transformer L2.
5. single tube resonant mode light-adjustable gas discharge lamp electronic ballast according to claim 1, is characterized in that: the sampled voltage signal of feedback takes from extreme (reference potential) the over the ground voltage of the C of switching tube VT0.
6. single tube resonant mode light-adjustable gas discharge lamp electronic ballast according to claim 1, is characterized in that: reach the light modulation object to lamp load FZ by the ON time length of by-pass cock pipe VT0.
7. single tube resonant mode light-adjustable gas discharge lamp electronic ballast according to claim 1, is characterized in that: by the low frequency modulations of switch tube VT0 ON time, makes the terminal voltage u of LC resonant network
aBfrequency there is the change of a few KHz, the frequency of its frequency change is hundreds of hertz, makes the frequency of the terminal voltage of lamp load FZ also be constantly change, thus solves the acoustic resonance problems of high-intensity gas discharge lamp.
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| CN105119660B (en) * | 2015-07-15 | 2017-08-11 | 南京南大光电工程研究院有限公司 | High speed LED light communication resonant mode modulator |
| CN107371312B (en) * | 2017-08-17 | 2023-08-29 | 威海东兴电子有限公司 | Self-resonance restarting short-circuit prevention ignition circuit without self-oscillation |
| CN109245330A (en) * | 2018-10-16 | 2019-01-18 | 西安科技大学 | A kind of push-pull type ICPT self-excitation starting of oscillation control circuit and its design method |
| CN114567943B (en) * | 2022-02-10 | 2023-10-31 | 浙江大华技术股份有限公司 | Light supplementing lamp |
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|---|---|---|---|---|
| CN1459999A (en) * | 2002-05-24 | 2003-12-03 | 龚明甫 | Method and device for preventing high frequency electron ballast to produce accoustic oscillation |
| CN2747818Y (en) * | 2004-11-26 | 2005-12-21 | 林万炯 | Adjustable highting ballast circuit having strip lamp resistance feedback net |
| CN102905449A (en) * | 2012-10-29 | 2013-01-30 | 林汉通 | High frequency generator, electrodeless lamp driving method and electrodeless lamp ballast |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1227706B1 (en) * | 2001-01-24 | 2012-11-28 | City University of Hong Kong | Novel circuit designs and control techniques for high frequency electronic ballasts for high intensity discharge lamps |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1459999A (en) * | 2002-05-24 | 2003-12-03 | 龚明甫 | Method and device for preventing high frequency electron ballast to produce accoustic oscillation |
| CN2747818Y (en) * | 2004-11-26 | 2005-12-21 | 林万炯 | Adjustable highting ballast circuit having strip lamp resistance feedback net |
| CN102905449A (en) * | 2012-10-29 | 2013-01-30 | 林汉通 | High frequency generator, electrodeless lamp driving method and electrodeless lamp ballast |
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Effective date of registration: 20170113 Address after: 528216 development zones of Guangdong province Foshan Nanhai District Danzao Town in Xi Lian Dong Cun Gao Sha Patentee after: Foshan run electronic technology Co., Ltd. Address before: Rushan City Xinping street Weihai city Shandong province 264500 Building 2 Unit No. 503 18-3 Patentee before: Xiao Guoxuan |