CN1582083A

CN1582083A - Electronic hallast for gas discharge lamp

Info

Publication number: CN1582083A
Application number: CN 03144079
Authority: CN
Inventors: 张玉清
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-08-01
Filing date: 2003-08-01
Publication date: 2005-02-16

Abstract

Electronic ballast includes dual voltage type power factor correcting circuit, active positive feedback circuit, anti float circuit, anti acoustic resonance circuit, power stable circuit and closing circuit of starting circuit, which are connected between input end and output end of EMI filter circuit, bridge type inversion main circuit and starting circuit. Features are simple structure, low cost, small volume, low temperature rise, anti float, anti acoustic resonance and stable output power.

Description

Electronic amperite of gas-discharge lamp

The invention belongs to electronic technology field, further relate to a kind of electronic amperite of gas-discharge lamp.

In the prior art: sell on the domestic market and actual matching used gas discharge lamp ballast, it more than 99% inductance type, it is big except volume, power factor is low, power consumption is big all has very big impact to electrical network and bulb when starting in addition, disturbs the useful life of the stable of line voltage and shortening gas discharge bulb significantly.Nowadays quite a few to the electric ballast development person of gaseous discharge lamp, but finished product is seldom on the market.Main cause still is a high-intensity discharge lamp under high-frequency current drives, and easily produces the arc harmony covibration of wafing.Also having the problem of temperature rise of high-power gas charging lamp ballast also is the serious problems that are difficult for being overcome.Overcome better multiple functional electric ballast for the problems referred to above, most of costs are higher, so fetch long price.Here it is is the electric ballast of the high-intensity gas discharge lamp of energy-conservation environmental protection again, at home the almost still blank main cause of practical application.

In order to overcome above-mentioned deficiency, the invention provides a kind of electronic amperite of gas-discharge lamp that arc harmony covibration performance is good, power output is stable, simple in structure, volume is little, temperature rise is low, reliability is high and with low cost that wafts that overcomes.

For achieving the above object, technical scheme of the present invention: comprise transistor, capacitor, resistor, transformer, inductance, it is characterized in that: form by the shut-off circuit of streaming circuit of power factor correction, active positive feedback, the anti-arc circuit that wafts, anti-acoustic resonance circuit, power stability circuit and start-up circuit by multiplication of voltage, be connected between the input and output of prior art EMI filter circuit, full bridge inverter main circuit and start-up circuit;

Described multiplication of voltage is pursued the streaming circuit of power factor correction: be made up of diode D1～D8, electrolytic capacitor C1～C4; The negative pole of described diode D1 is connected with the output of electromagnetic interface filter " A " with the positive pole of diode D2, and the positive pole of D1 is connected with positive pole and the dc output end positive pole " C " of electrolytic capacitor C1 and diode D5.The negative pole of described electrolytic capacitor C1 is connected with the positive pole of diode D3 and the negative pole of diode D4.The tail end of the positive pole of the negative pole of the negative pole of described diode D3 and electrolytic capacitor C2, the positive pole of electrolytic capacitor C3, diode D8, the elementary winding T3a of choking coil T3 and the output " B " of filter EMI are connected.The positive pole of described electrolytic capacitor C2 is connected with the positive pole of diode D4 and the negative pole of diode D5.The negative pole of described diode D2 is connected with the negative pole of diode D6, the negative pole of electrolytic capacitor C4 and the output " D " of power supply.The positive pole of described diode D6 is connected with the negative pole of electrolytic capacitor C3 and the negative pole of diode D7.The positive pole of described diode D7 is connected with the negative pole of diode D8 with electrolytic capacitor C4.

Described active positive feedback: be made up of two identical parts of last bridge active positive feedback and following bridge active positive feedback, each partly is divided into plastic drive circuit and its power supply circuits again.

The described bridge active positive feedback that goes up is by transistor BG3～BG4, resistor R 1～R4, diode D9～D11, voltage stabilizing didoe DW1, electrolytic capacitor C6, feedback transformer secondary winding T1c forms with resonance transformer secondary output winding T2c: an end of described resistor R 1 is connected with the source electrode of transistor BG1 with positive source " C " end, the emitter of the other end and transistor BG3, the tail end of feedback winding T1c (is annotated: for convenience of explanation, one end of the winding symbol band point on the Figure of description is a head end, and the other end is a tail end) and diode D10, D11, voltage stabilizing didoe DW1, the positive pole of electrolytic capacitor C6 is connected.The base stage of described transistor BG3 is connected with the negative pole of diode D10, an end of resistor R 3, the other end of described resistor R 3 and the head end that feeds back winding.The collector electrode of described transistor BG3 is connected with the negative pole of diode D9, the base stage of transistor BG4 and an end of resistor R 2.The positive pole of described diode D9 is connected with the grid of transistor BG1 and the emitter of transistor BG4, the end of the negative pole of the other end of the collector electrode of described transistor BG4 and resistor R 2, voltage stabilizing didoe DW1, the negative pole of electrolytic capacitor and resonance Secondary winding of transformer T2c, output " E " point of the bridge inverter main circuit of common and transistor BG1, BG2 composition is connected, the negative pole of described diode D11 is connected with an end of resistor R 4, and the other end of described resistor R 4 is connected with the other end of the secondary winding T2c of resonance transformer.

Described bridge active positive feedback down: be made up of transistor BG5～BG6, resistor R 5～R8, diode D12～D14, voltage stabilizing didoe DW2, electrolytic capacitor C7, feedback transformer secondary winding T1d and resonance transformer secondary output winding T2d: an end of described resistor R 5 is connected with the output of inverter " E " end with the source electrode of transistor BG2, and the other end is connected with the emitter of transistor BG5, the head end of feedback winding T1d and the positive pole of diode D13～D14, voltage stabilizing didoe DW2, electrolytic capacitor C7.The base stage of described transistor BG5 is connected with the negative pole of diode D13 and an end of resistor R 7, and the other end of described resistor R 7 is connected with the head end of feedback winding T1d.The collector electrode of described transistor BG5 is connected with the base stage of diode D12 negative pole, transistor BG6 and an end of resistor R 6.The positive pole of described diode D12 is connected with the grid of transistor BG2 and the emitter of transistor BG6, the end of the negative pole of the other end of the collector electrode of described transistor BG6 and resistor R 2, the negative pole of voltage stabilizing didoe DW2, electrolytic capacitor, the secondary winding T2d of resonance transformer and the drain electrode of transistor BG2 are connected with power cathode " D " end, the negative pole of described diode D14 is connected with an end of resistor R 8, and the other end of described resistor R 8 is connected with the other end of the secondary winding T2c of resonance transformer.

The described acoustic resonance circuit that prevents: form by the hold concurrently secondary winding T3b of transformer T3 of secondary winding T1b, inductance L 1 and the choking coil of feedback transformer T1.The head end of the secondary winding T1b of described feedback transformer T1 is connected with an end of inductance L 1, and the hold concurrently head end of secondary winding T3b of transformer T3 of the other end of inductance L 1 and choking coil is connected.The tail end of described winding T1b is connected with the tail end of winding T3b and is connected with negative pole " D " end of power supply.

Described anti-waft arc circuit and power stability circuit: be made up of capacitor C9～C12, resistor R 9～R12, R16～R17, transistor BG7～BG8, voltage stabilizing didoe DW3～DW4 and trimmer potentiometer RV1: the end of described capacitor C10 is connected with the head end of resonance transformer winding T2a and the end of resonant capacitor C9, and the other end of C10 is connected with the source electrode of transistor BG7.The drain electrode of described transistor BG7 is connected with power cathode " D " end simultaneously with the other end of capacitor C9.The grid of transistor BG7 is connected with the end of resistor R 10 and capacitor C11.On the tie point of other end termination resistor R16, the R17 of described capacitor C11.The other end of resistor R 16 is connected with AC power " A " end, and the other end of resistor R 17 is connected with power cathode " D " end.One end of described resistor R 9 is connected with positive source " C " end, and the other end is connected with the other end of resistor R 10, the positive pole of voltage stabilizing didoe DW3 and the collector electrode of transistor BG8.The hold concurrently head end of secondary winding T3b of transformer T3 of one end and the choking coil of described resistor R 11 is connected, and the other end is connected with the negative pole of diode D15.The positive pole of described diode D15 is connected with the end of capacitor C12 and an end of trimmer potentiometer, the feather key of described trimmer potentiometer RV1 is connected with voltage stabilizing didoe DW4 positive pole, the negative pole of voltage stabilizing didoe DW4 is connected with the base stage of transistor BG8 and an end of resistor R 12, and the other end of the emitter of the negative pole of described voltage stabilizing didoe DW4, transistor BG8 and resistor R 12, trimmer potentiometer RV1 and capacitor C12 is connected with power cathode " D " end jointly.

The shut-off circuit of described start-up circuit: form by resistor R 13 and transistor BG9, one end of described resistor R 13 is connected with the positive pole of diode D15, the other end is connected with the base stage of transistor BG9, the collector electrode of described transistor BG9 is connected with the charging resistor R14 of start-up circuit, the tie point of R15, and emitter is connected with power cathode " D ".

Description of drawings:

Accompanying drawing is a circuit embodiments schematic diagram of the present invention.

Below in conjunction with accompanying drawing structure of the present invention and operation principle are done simple declaration:

As shown in the figure; The present invention is a kind of electronic amperite of gas-discharge lamp, mainly is provided with EMI filter circuit, multiplication of voltage by streaming circuit of power factor correction, semibridge system inverter main circuit, active positive feedback, the anti-arc that wafts, anti-acoustic resonance circuit, power output stabilizing circuit and start-up circuit composition.Described EMI filter circuit is a prior art, and concrete method of attachment and operation principle repeat no more.

Below in conjunction with accompanying drawing structure of the present invention and operation principle are described in further detail:

Described multiplication of voltage is pursued the streaming circuit of power factor correction: be made up of diode D1～D8, electrolytic capacitor C1～C4.Described active positive feedback: actual plastic drive circuit and its power-supply circuit two parts composition of being divided into.The described bridge plastic drive circuit of going up is made up of transistor BG3～BG4, diode D9～D10 and resistor R 2～R3, and described bridge plastic drive circuit transistor BG5～BG6, diode D12～D13 down and resistor R 6～R7 form.The described bridge power-supply circuit of going up is by resistor R 1, R4, diode D11, and voltage stabilizing didoe DW1 and electrolytic vessel C6 form.Described down bridge power-supply circuit is by resistor R 5, R8, diode D14, and voltage stabilizing didoe DW2 and electrolytic vessel C7 form.Described anti-acoustic resonance circuit is made up of the hold concurrently winding T3b of transformer T3 of secondary winding T1b, inductance L 1 and the choking coil of feedback transformer T1.The described anti-arc circuit that wafts is made up of resistor R 16～R17, capacitor C10, C11 and transistor BG7.Described power stability circuit is made up of the hold concurrently secondary winding T3b of transformer T3 of resistor R 9～R12, capacitor C10, C12, transistor BG7～BG8, voltage stabilizing didoe DW3～DW4, trimmer potentiometer RV1 and choking coil.Described start-up circuit and its shut-off circuit are made up of resistor R 13～R15, capacitor C13, diac DT1 and transistor BG9.

Operation principle of the present invention is as follows:

When power connection: alternating voltage V _ACOutput to input " A ", " B " two ends that the multiplication of voltage is made up of diode D1～D8 and electrolytic capacitor C1～C4 is pursued the streaming circuit of power factor correction through the EMI filter circuit.The tail end of the positive pole of the positive pole of " B " end and the negative pole of diode D3, diode D8, the negative pole of electrolytic capacitor C2, electrolytic capacitor C3 and the T3a of choking coil T3 is connected, for multiplication of voltage is pursued streaming circuit of power factor correction mid-point voltage.When supply voltage was positive half cycle: " A " terminal voltage was for just, when " B " terminal voltage is negative, diode D1, D4 are in the forward potential conducting, diode D3, D5, D2 are in reverse potential and end, positive current is given electrolytic capacitor C1～C2 charging simultaneously through diode D1, D4, powers to inverter circuit and start-up circuit through the anode " C " of capacitor C1 simultaneously.When positive half cycle finished, diode D1, D4 ended, D3, D5 conducting, and electrolytic capacitor C1, C2 begin to continue power supply by diode D3, D5, warp " C " end to inverter circuit and start-up circuit.When supply voltage was negative half period, " A " terminal voltage was for negative, and " B " terminal voltage is for just, diode D2, D7 are in the forward potential conducting, D6, D8, D1 are in reverse potential and end, and negative current is given electrolytic capacitor C3～C4 charging respectively through diode D2, D7.Give inverter circuit, start-up circuit power supply through the negative terminal " D " of capacitor C4 simultaneously.When negative half period finished, diode D2, D7 ended, diode D6, D8 conducting, and electrolytic capacitor C3, C4 begin to continue power supply through " D " end to inverter circuit and start-up circuit through D6, D8.Another advantage of this circuit is: when " C " end capacitor discharge voltage descends, the other end " D " corrects when being the voltage on capacitor rising, the use because the voltage at positive and negative two ends is together in series, so the lifting of both positive and negative polarity voltage has mutual compensating action, make the voltage waveform of output more common many stably, and output voltage double by the streaming circuit of power factor correction.

Described active positive feedback and start-up circuit:

When electric current arrives power cathode " D " from positive source " C " through resistor R 1, voltage stabilizing didoe DW1, resistor R 5 and voltage stabilizing didoe DW2, because the pressure stabilization function of voltage stabilizing didoe DW1, DW2 is given electrolytic capacitor C6, C7 charging respectively, voltage is stabilized on the voltage stabilizing value of DW1, DW2, and the upper end of capacitor C6, C7 is that anodal lower end is a negative pole.Because at this moment secondary winding T1c, the T1d of feedback transformer T1 also do not have voltage output, so shaping driving transistors BG3, BG5 and bridge-type inverter major loop transistor BG1, BG2 are in cut-off state.Because resistor R 1, temperature and pressure pipe DW1, resistor R 5 and voltage-stabiliser tube DW2 are attempted by power supply " C ", " D " two ends after the series connection.Resistance owing to resistor R 1, R5 when designing equates that the voltage stabilizing value of voltage stabilizing didoe DW1, DW2 equates, so the voltage of the output point of inverter " E " approximates supply voltage 1/2 again.This voltage also charges (at this moment because charging stream small voltage rises slow to resonant capacitor C9, C10 through the elementary winding T2a of resonance transformer T2 simultaneously, can not produce the positive feedback phenomenon), the elementary winding T2a end link of resonant capacitor C9, C10 and feedback transformer and " E " terminal voltage are equated.Electric current process resistor R 14, the R15 of positive source " C " utmost point give capacitor C13 charging simultaneously at this, the voltage at container C 13 two ends is raise, when the voltage at capacitor C13 two ends is elevated to the breakdown voltage value of diac DT1, diac DT1 conducting immediately, the voltage at capacitor two ends instantaneous through diac DT1 to the hold concurrently secondary winding T3c discharge of transformer T3 of choking coil, the transformer action of transformer T3 because choking coil is held concurrently, the high voltage pulse that will induce the 3-5 kilovolt at the two ends of elementary winding T3a comes.This high voltage pulse can be added in the two ends of gas discharge bulb HID through capacitor C5, inverter output end " E " end and capacitor C8, makes gas discharge bulb HID disruptive discharge.After gas discharge bulb HID punctures, internal resistance sharply descends, because during capacitor C13 discharge, positive voltage is added to the tail end of the secondary T3a of choking coil T3, negative voltage is added to the head of T3a, sense another secondary T3b of T3, the head end of same T3b is output as negative pole, tail end is output as positive pole, again because winding T3b is connected with head end with the head end of the winding T1b of feedback transformer T1, tail end is connected with tail end, middle series connection inductance L 1, so the head end of T1b is input as negative pole, tail end is input as positive pole.The two ends of sensing secondary winding T1c, the T1d of T1 are that head end is negative equally, and tail end is for just.Winding T1c head end is that timing makes transistor BG3 base stage be in the forward bias conducting by resistor R 3 for negative, tail end, and the voltage at resistor R 2 two ends that are connected with its collector electrode waits the voltage at capacitor C6 two ends approximately, and resistor R 2 upper ends are that positive lower end is for negative.Diode D9 then is in the forward bias conducting state, the base voltage of transistor BG4 is higher than emitter voltage and is in reverse bias and ends, conducting makes the potential difference at " C ", " E " two ends approach zero so the grid voltage of transistor BG1 approximates the voltage at capacitor C6 two ends.When winding T1d head end is timing for negative, tail end, making the base stage of transistor BG5 be in reverse bias by resistor R 7 ends, the voltage at resistor R 6 two ends that are connected with its collector electrode etc. zero, because the acting in conjunction of resistor R 6 and transistor BG6 equals zero the grid of transistor BG2 and the voltage between " D " end, so transistor BG2 ends.So the output of inverter circuit " E " terminal voltage approximates power supply " C " terminal voltage.At this moment " E " terminal voltage can be through the elementary winding T2a of resonance transformer T2 to resonant capacitor C9, C10 charging, at this moment the head end of the T2a winding of resonance transformer T2 for negative, tail end for just, sense secondary T2a winding two ends, head end for bear, tail end is being for just.Because the two ends of the two ends of the elementary winding T1a of feedback transformer T1 and the secondary winding T2b of resonance transformer T2, head end is connected with tail end with head end, tail end, so the head end of T1a for negative, tail end for just, two secondary winding T1c, the T1d two ends head end of sensing feedback transformer T1 equally is that negative pole, tail end are that positive pole continues to keep transistor BG1 continuation conducting, transistor BG2 continues to end, and output " E " terminal voltage of keeping inverter circuit approximates power supply " C " terminal voltage.As resonant capacitor C9, when C10 charging end of a period and beginning back discharge: electric current flows to tail end through the head end of the T2a of resonance transformer T2, " E " end, capacitor C5, C3, D7, C4 and " D " end constitute back discharge and charge circuit, because the sense of current of the T2a of resonance transformer T2 flows to tail end by head end, at this moment the T2a head end is for just, tail end is for negative, the head end of sensing secondary T2b is for just, tail end is for negative, because the two ends of the two ends of the elementary winding T1a of feedback transformer T1 and the secondary winding T2b of resonance transformer T2, head end and head end, tail end is connected with tail end, so the head end of T1a is for just, tail end is for negative, sense the secondary T1c of T1, the two ends of T1d are head ends for just equally, and tail end is for negative.Winding T1c head end for just, tail end when negative, be connected to transistor BG3 base stage through resistor R 3, make it be in reverse bias and end, the voltage at resistor R 2 two ends that are connected with its collector electrode equals zero.Because the residual voltage of the grid capacitor of transistor BG1 is for just, diode D7 is in reverse bias to be ended, the emitter voltage of transistor BG4 is higher than base voltage and is in forward bias and conducting, so the grid capacitor voltage of transistor BG1 is bled off by transistor BG4 rapidly and equals zero, transistor BG1 ends rapidly.Winding T1d head end for just, tail end is connected to the base stage of transistor BG5 when negative by resistor R 7, make it be in forward bias and conducting, make the voltage at resistor R 6 two ends of its collector electrode connection approximate capacitor C7 both end voltage, diode D10 is in forward bias and conducting, the base potential of transistor BG6 is higher than the emitter current potential and is in reverse bias and ends, voltage between the grid of transistor BG2 and " D " end waits capacitor C7 both end voltage approximately, so transistor BG2 conducting.So the output of inverter circuit " E " terminal voltage is by approximating " C " voltage transitions into about equaling power supply " D " terminal voltage.At this moment resonant capacitor C9, C10 continue through the elementary winding T2a " E " of resonance transformer T2 terminal voltage to discharge, the effect of the regenerative circuit that continuation becomes through resonance transformer T2, these a series of circuit bank of feedback transformer T1 and plastic drive circuit, make transistor BG1 continue to end, transistor BG2 continues conducting, and output " E " terminal voltage of keeping inverter circuit approximates power supply " D " terminal voltage.When resonant capacitor C9, C10 reverse charging end and begin the forward discharge, because resonance transformer T2, feedback transformer T1 and these a series of circuit of plastic drive circuit produce reciprocal positive feedback effect, make transistor BG2 by, BG1 conducting, the output of inverter circuit " E " terminal voltage converts to again and approximates power supply " C " terminal voltage.Owing to constantly charge between the elementary T2a of resonance transformer T2 and resonant capacitor C9, the C10, discharge, reverse charging and back discharge, effect through above-mentioned positive feedback drive circuit makes the continuous alternate conduction of transistor BG1, BG2, ends again, and the output of inverter circuit " E " just constantly produces the square-wave voltage that is close with supply voltage.Change resonant capacitor C9, the capacity of C10 and the inductance value of the elementary T2a of resonance transformer T2, will change their resonance frequency, also just changed the frequency of square-wave voltage of output " E " end of inverter circuit.This voltage constitutes charging and discharging circuit through T3a winding, gas discharge lamp HID and the mid-point voltage " B " of capacitor C8, choking coil T3 end, makes gas discharge lamp HID obtain energy and luminous.Plastic drive circuit will consume certain electric energy when work, the power supply of depending merely on resistor R 1, R5 is far from being enough.In order to save power loss, mainly rely on two secondary winding T2c, the T2d of resonance transformer T2 and current-limiting resistor R4, R8 and rectifier diode D11, D14 give respectively electrolytic vessel C6, C7 charging give altogether about two plastic drive circuits of bridge required electric energy when working.

Described anti-acoustic resonance circuit:

Anti-acoustic resonance circuit is that the T1b winding by feedback transformer T1 is composed in series through T3b winding and the inductance L 1 of inductor L1 and choking coil T3, because the T1b winding of feedback depressor T1 and the T3b winding head of choking coil T3 are connected with tail with head, tail, the T1b winding of the T3a winding of choking coil T3 and feedback transformer T1 is that same-phase belongs to the positive feedback relation like this.When gas discharge lamp HID produced the acoustic resonance phenomenon, the acoustic resonance voltage of generation was sensed secondary T3b winding after inductance L 1 through the elementary T3a winding of choking coil T3, is added to the T1b winding two ends of feedback transformer T1.Because the delayed action of inductance L 1 has destroyed the phase relation of acoustic resonance phenomenon, so just suppressed the generation of acoustic resonance phenomenon.

The described anti-arc circuit that wafts:

The anti-arc circuit that wafts is made up of capacitor C9～C11, resistor R 16～R17 and transistor BG7.Because the height of the grid voltage of transistor BG7.The direct size of the charging and discharging currents of control capacitor C10 directly influences the height of the frequency of oscillation of resonant tank.Gaseous discharge lamp can produce the arc phenomenon of wafing under the driving of high-frequency current, when the frequency of drive current not simultaneously, position that the electric arc of gaseous discharge lamp waves and shape can be different, as long as the frequency of the drive current of suitable periodic variation gaseous discharge lamp will make the arc stability of gaseous discharge lamp no longer wave in a fixed range.The present invention is the pulsating voltage that utilizes the alternating component 50～60Hz of supply voltage " A ", after resistor R 16, R17 dividing potential drop, be coupled to the grid of transistor BG7 again by capacitor C11, at this moment the self-oscillatory frequency of bridge-type inverter will be by the pulsating voltage of 50～60Hz institute frequency modulation, and the amplitude of the grid of the width of frequency change and transistor BG7 input pulsating voltage and the capacity ratio of resonant capacitor C9, C10 are relevant.When not waftd the arc phenomenon with just not produced by the high-frequency electrical diffluence gas discharge lamp of suitable frequency modulation.Pulsating voltage waveform about the grid that is added to transistor BG7 also can be sine wave, square wave, triangular wave etc.: as long as frequency and voltage amplitude suitably can be prevented the arc effect of wafing.

Described power stability circuit:

The power stability circuit is made up of capacitor C10～C12, resistor R 9～R12, transistor BG7～BG8, voltage-stabiliser tube DW3～DW4 and trimmer potentiometer RV1.When gaseous discharge lamp is lighted, the size of current that flows through the T3a winding of choking coil T3 changes, the voltage that can sense secondary winding T3b two ends just changes, and this voltage is through current-limiting resistor R11 current limliting, be rectified into positive voltage, be added in the trimmer potentiometer two ends after C12 filtering by diode D13.Suitably select the voltage stabilizing value of voltage-stabiliser tube DW4 and the seat of trimmer potentiometer RV1 feather key, just can control the size of the power output of electric ballast.When the electric current of the T3a winding that flows through choking coil T3 increases, sense secondary, winding T3b two ends are raise, through diode D13 rectification, after the capacitor C13 filtering, the voltage at trimmer potentiometer two ends is raise, the voltage of its feather key output also raises relatively, voltage-stabiliser tube DW4 reverse current increases rises transistor BG8 base voltage, collector current increases, collector voltage descends, through resistor R 10 grid voltage of BG7 is also descended, when the grid voltage of body pipe BG7 descends, make the reducing of charging and discharging currents of capacitor C10, the capacity that is equivalent to capacitor C10 reduces, and the output frequency of self-excitation bridge-type inverter is raise since the frequency characteristic of choking coil T3 be frequency rising impedance with regard to corresponding rising, the electric current of the choking coil that flows through also reduces with regard to corresponding.On the contrary: when the electric current of the T3a winding that flows through choking coil T3 reduces, the voltage at trimmer potentiometer two ends is descended, voltage-stabiliser tube DW4 reverse current reduces to make transistor BG8 base voltage to descend, collector current reduces, collector voltage rises, through resistor R 10 grid voltage of BG7 is also risen, when the grid voltage of body pipe BG7 rises, make the increase of the charging and discharging currents of capacitor C10, the capacity that is equivalent to capacitor C10 increases, and the output frequency of self-excitation bridge-type inverter is descended, because the frequency characteristic of choking coil is that frequency decline impedance is with regard to corresponding decline, so the electric current of the choking coil that flows through is also with regard to corresponding increase.Will make this electric ballast in certain voltage range, keep power output stable by above-mentioned control procedure.Wherein voltage-stabiliser tube DW3 mainly shields, prevent transistor BG8 by the time collector voltage too high, make the insulated gate electrode of transistor BG7 breakdown.

The shut-off circuit of described start-up circuit:

The shut-off circuit of start-up circuit is made up of transistor BG9, resistor R 13, after gas discharge lamp HID is lighted, the positive pole of diode D13 will be exported a positive voltage, this voltage is added on the base stage of transistor BG9 through resistor R 13, make the BG9 conducting, the voltage of the resistor R 14 that is connected with collector electrode, the tie point of R15 equals zero, and capacitor C13 can be recharged, and start-up circuit is closed.

The present invention has following advantage:

Described multiplication of voltage is by the streaming circuit of power factor correction: because common by streaming circuit of power factor correction output voltage Lower, be about 95% of supply voltage. And just have 265 volts during the high value of supply voltage, through common by the streaming power factor The voltage of correcting circuit output only has 252 volts, and during the gas-discharge lamp normal operation, about 100 volts of both end voltage, but want Stable work then needs positive and negative 150 volts of above high frequency voltages; Just need 300 volts (peak-to-peak values) above height Frequently voltage drive could be stable work, and common can not normally be used for gas by the streaming circuit of power factor correction Use in the electric ballast of body discharging lamp, described multiplication of voltage has obvious advantage by the streaming circuit of power factor correction. With APFC is compared, though line power factor λ and harmonic content THD index slightly descend, also all exists Country organizes within the indication range of defined with international relevant electrician. But the benefit that brings is: power attenuation and temperature rise Be 50% of APFC approximately, cost is 30% of APFC, and temperature rise is asked Topic but is the most formidable problem of great-power electronic ballast of APFC more than 500 watts.

Described active positive feedback: can be shaped to comparatively ideal square wave to just profound ripple or approximate rectangular ripple, with existing The positive-feedback circuit of resistor current limiting, voltage-stabiliser tube pressure limiting is compared: has the switching loss of high power valve is obviously reduced, Temperature rise obviously reduces, and especially seems very heavy in the self-excitation bridge inverter main circuit of this high-power output more than several hectowatts Want.

The described anti-arc circuit that wafts, anti-acoustic resonance circuit: in existing electronic amperite of gas-discharge lamp, mostly use complexity Integrated circuit produce high and low two kinds of frequencies, drive four high power valve transistors and export to realize this function, and This circuit only uses two high power transistor outputs and two little magnetic elements to form, and cost obviously reduces.

Described power stability circuit: the power control in the existing technology, great majority all are the inputs of control bridge-type inverter The voltage height is controlled the power output size. This circuit is the output frequency height of control self-excitation bridge-type inverter, controls Power output size processed. The advantage of this circuit is the passive power factor correcting circuit that not only is applicable to not voltage stabilizing output, more Be applicable to the APFC of voltage stabilizing output.

The breaking circuit of described start-up circuit: this circuit is compared with traditional circuit, has increased a resistor R13 and one Transistor BG9, the benefit that brings is: not only can make this electric ballast can light the external trigger discharge lamp, in also lighting Trigger discharge lamp. And traditional circuit is crossed low or circuit when slightly leaking electricity in the internal resistance of interior tactile discharge bulb, often can not be putting Electric light is lighted.

Claims

1, a kind of gaseous discharge lamp acoustic-electric sub-ballast, comprise transistor, capacitor, resistor, transformer, inductance, it is characterized in that: the input that is connected prior art EMI filter circuit, bridge rectifier, passive or APFC, bridge-type inverter and start-up circuit by multiplication of voltage by the shut-off circuit of streaming circuit of power factor correction, active positive feedback, the anti-arc circuit that wafts, anti-acoustic resonance circuit, power invariability control circuit and start-up circuit with export between form.

2, according to the described a kind of gaseous discharge lamp acoustic-electric of claim 1 sub-ballast, it is characterized in that: multiplication of voltage is made up of diode D1～D8, electrolytic capacitor C1～C4 by the streaming circuit of power factor correction.

3, according to the described a kind of gaseous discharge lamp acoustic-electric of claim 1 sub-ballast, it is characterized in that: described active positive feedback is made up of resistor R 1～R8, diode D～D14, voltage-stabiliser tube DW1～DW2, capacitor C6～C7, transistor BG3～BG7, transformer T1～T2.

4, according to the described a kind of gaseous discharge lamp acoustic-electric of claim 1 sub-ballast, it is characterized in that: the described anti-arc circuit that wafts is made up of resistor R 16～R17, capacitor C10～C11, transistor BG7.

5, according to the described a kind of gaseous discharge lamp acoustic-electric of claim 1 sub-ballast, it is characterized in that: described anti-acoustic resonance circuit is together in series by the secondary winding T3b of secondary winding T1b, inductance L 1 and the choking coil T3 of feedback transformer T1 and forms.

6, according to the described a kind of gaseous discharge lamp acoustic-electric of claim 1 sub-ballast, it is characterized in that: described power invariability control circuit is made up of resistor R 9～R12, capacitor C10～C12, voltage-stabiliser tube DW3～DW4, transistor BG7～BG8 and trimmer potentiometer RV1.

7, according to the described a kind of gaseous discharge lamp acoustic-electric of claim 1 sub-ballast, it is characterized in that: the shut-off circuit of described start-up circuit is made up of resistance R 13 and transistor BG9.

8, according to the described a kind of gaseous discharge lamp acoustic-electric of claim 1 sub-ballast, it is characterized in that: described bridge-type inverter is the half-bridge or the full-bridge inverter of self-excitation, independent-excited.

9, according to the described a kind of gaseous discharge lamp acoustic-electric of claim 1 sub-ballast, it is characterized in that: described bridge inverter main circuit is electric ballast, switch transformer, electronic welding machine, ultrasonic wave driving power, inverter power supply or electromagnetic oven etc. as the electronic product of output.

10, according to the described a kind of gaseous discharge lamp acoustic-electric of claim 1 sub-ballast, it is characterized in that: the shut-off circuit of described active positive feedback, the anti-arc circuit that wafts, anti-acoustic resonance circuit, power invariability control circuit and start-up circuit can be resolution element, also can be integrated circuit.