CN109348604A - A kind of Metal halogen lamp ballast of constant-power control circuit - Google Patents
A kind of Metal halogen lamp ballast of constant-power control circuit Download PDFInfo
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- CN109348604A CN109348604A CN201811407890.2A CN201811407890A CN109348604A CN 109348604 A CN109348604 A CN 109348604A CN 201811407890 A CN201811407890 A CN 201811407890A CN 109348604 A CN109348604 A CN 109348604A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
- H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/36—Controlling
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Abstract
A kind of Metal halogen lamp ballast of constant-power control circuit, including rectification circuit, booster circuit, power control circuit and the output circuit being sequentially connected electrically；The power control circuit includes constant-power control circuit, ignition timing circuit and reduction voltage circuit；The constant-power control circuit is connect with booster circuit, and the constant-power control circuit is connect by reduction voltage circuit with output circuit；The constant-power control circuit includes current feedback loop and voltage feedback loop；The rectified circuit of electric main, booster circuit are converted to the DC voltage higher than alternating current peak value and give invariable power circuit, it is depressurized to output circuit output using the reduction voltage circuit in power control circuit, the power control circuit realizes power limitation control in pressure reduction with electric current, voltage ring feedback.The present invention cleverly utilizes multiplier to realize negative voltage feedback, and structure is simple, is conducive to the power stability of Metal halogen lamp ballast working condition.
Description
Technical field
The present invention relates to power control fields, refer in particular to a kind of Metal halogen lamp ballast of constant-power control circuit.
Background technique
Metal halide lamp abbreviation Metal halogen lamp is a kind of high-voltage gas discharging light, has photochromic white and nature, colour rendering index
Fine quality high, light efficiency is high.Compared with new light sources LED, same power, volume is much smaller than LED lamp, without huge heat dissipation
Piece can be used for the illumination in market, workshop, square, road.For Metal halogen lamp power supply device be referred to as Metal halogen lamp ballast, below letter
Claim ballast.Ballast is divided to Inductive ballast and two kinds of electric ballast.Electric ballast has many advantages, such as, such as power factor
It is high, current wave crest ratio is low, power stability, timing ignition, does not occur acoustic resonance frequency etc..But circuit of electronic ballast is complicated, member
Part is more, and design difficulty is big, and technique is complicated, poor reliability, and failure is multiple.Many component parameters are varied with temperature and are drifted about, and are drawn
Play the variation of ballast univers parameter or even cisco unity malfunction.How to guarantee that electric ballast performance is stablized, improving reliability is
The difficulty that this industry faces.
Electric ballast failure is varied, it can be common that power is unstable, and it is more obvious to rise this trend with temperature, draws
Play ballast damage.The present invention designs new circuit structure aiming at this problem, keeps power more stable, improves performance.
Summary of the invention
For the problems in above-mentioned background technology, a kind of Metal halogen lamp ballast of constant-power control circuit is provided, can be led to
Overvoltage, current double-ring feedback, realize the power limitation control during Metal halogen lamp work.
The Metal halogen lamp ballast of a kind of constant-power control circuit of the present invention, it is characterised in that: including being successively electrically connected
Rectification circuit, booster circuit, power control circuit and the output circuit connect；The power control circuit includes power limitation control electricity
Road, ignition timing circuit and reduction voltage circuit；The constant-power control circuit is connect with booster circuit, the constant-power control circuit
It is connect by reduction voltage circuit with output circuit；The constant-power control circuit includes current feedback loop and voltage feedback loop；
Ignition timing circuit generates high-voltage pulse by constant-power control circuit, lights a fire for Metal halogen lamp, after lighting a fire successfully, point
Fiery timing circuit stops working；The rectified circuit of electric main, booster circuit are converted to high voltage direct current and supply electricity to invariable power circuit, then
By the reduction voltage circuit in power control circuit be depressurized to output circuit output, the power control circuit in pressure reduction with
Electric current, voltage ring feedback realize power limitation control.
Further, the constant-power control circuit includes: dual operational amplifier, power factor correction controller, by
Integrating circuit, current feedback loop and the voltage feedback loop that one resistance and first capacitor are constituted；The dual operational amplifier
Normal phase input end is grounded by first capacitor, and first resistor is connected between the normal phase input end and first capacitor, and with the
The series connection of five resistance is followed by an input terminal of the internal comparator into power factor correction controller；DC power supply gives double operations to put
Big device and power factor correction controller provide regulated power supply；It is examined by zero passage at the zero passage detection end of power factor correction controller
Survey the ground terminal of winding access power factor correcting controller；The triggering end of ignition timing circuit is connected to dual operational amplifier
Output end；Current feedback loop is connected to the current peak test side of power factor correction controller；Voltage feedback loop connection
Between the multiplier input and ground terminal of power factor correction controller.
Further, the current feedback loop include inductor winding, first diode, the second capacitor, field-effect tube and
4th resistance；The grid of the driving stage port concatenation field-effect tube of power factor correction controller, the source electrode of field-effect tube pass through
4th resistance is simultaneously grounded, the first pin of the drain electrode tandem electric inductance winding of field-effect tube, the first pin of inductor winding and first
The second pin of diode cathode electrical connection, inductor winding passes through the second capacitance connection to first diode cathode；Output circuit
It is connected to the second capacitor both ends；
The current feedback loop is changed defeated by adjusting the resistance value of the 4th resistance or the closed-loop gain of feedback loop
Power out.
Further, the voltage feedback loop includes buck inductor auxiliary winding, the second diode, by second resistance and
The bleeder circuit and filter capacitor that three resistance are constituted；One end of the buck inductor auxiliary winding is connected to zero passage detection winding and function
Between the ground terminal of rate factor correcting controller, the other end of buck inductor auxiliary winding pass sequentially through the second diode anode,
Cathode, second resistance and 3rd resistor ground connection, the multiplier input of power factor correction controller be connected to second resistance with
Between 3rd resistor；Filter capacitor is connected in parallel on 3rd resistor both ends；
The multiplier that the voltage feedback loop is sent into power factor correction controller by receiving voltage feedback signal
Make multiplying with current feedback signal, as a result input comparator makees reference voltage, and current sampling signal is sent into power factor school
Comparator in positive control device controls the switch of field-effect tube compared with reference voltage to maintain stable output power.
Further, the rectification circuit includes: filter inductance, filter capacitor and rectifier bridge；Electric main and filtered electrical
The ac input end of sense and filter capacitor parallel connection access rectifier bridge, the cathode output end ground connection of rectifier bridge, the anode of rectifier bridge are defeated
Outlet series boosting circuit.
Further, the booster circuit includes: boost inductance, switching tube, freewheeling diode and electrolytic capacitor；The liter
Voltage inductance is by the drain electrode of switching tube and source electrode ground connection, the freewheeling diode and electricity in parallel between the drain electrode and source electrode of switching tube
Solve capacitor；The anode of the electrolytic capacitor and the cathode junction of freewheeling diode are invariable power circuit power supply.
It further, further include circuit of power factor correction among the rectification circuit and booster circuit；The power because
Number correcting circuit includes: boost inductance, switching tube, power factor correction controller；The zero passage detection winding of the boost inductance
Be connected between the zero passage detection end of power factor correction controller and ground terminal, the grid of the switching tube be connected to power because
The driving stage port of number correcting controller.
Further, base integrated transporting discharging when the ignition timing circuit includes, with when base integrated transporting discharging control the igniting
The igniting number of seconds of electric discharge triggering electric arc tube in timing circuit avoids continuing to occur high-voltage pulse damage ballast in given threshold
Device.
Further, the output circuit includes: output end, full-bridge circuit, series resonant circuit；The full-bridge circuit packet
Include a plurality of field-effect tube, grid drive chip；The grid of the driver output end connection field-effect tube of grid drive chip, field
Be connected in parallel with a capacitor between the drain electrode and source electrode of effect pipe, Metal halogen lamp be serially connected in grid drive chip driver output end it
Between, it is connected in parallel to after the output end two sides parallel filtering capacitor, then high-tension transformer of connecting with series resonant circuit another
Side output end, the series resonant circuit are sequentially connected in series and are constituted by inductance, capacitor, high-tension transformer winding.
The present invention is made using multiplier is carried in power factor correction controller by increasing a voltage negative feedback loop
Metal halogen lamp ballast working condition reaches voltage, current double-ring feedback, can reduce existing Metal halogen lamp ballast and be drawn by temperature is excessively high
Power rise risen etc. influences, and extends the service life of Metal halogen lamp ballast.The present invention overcomes the basic of invariable power circuit
Defect increases modulating voltage feedback loop, avoids the factors such as high temperature, clutter, leakage current, resonance and make in the Metal halogen lamp course of work
At influence, electric current, voltage ring feedback further stabilize lamp power.
In order to the clearer understanding present invention, a specific embodiment of the invention is illustrated below with reference to Detailed description of the invention.
Detailed description of the invention
Fig. 1 is the circuit block diagram of the embodiment of the present invention.
Fig. 2 is the circuit structure signal of the rectification circuit, circuit of power factor correction, booster circuit of the embodiment of the present invention
Figure.
Fig. 3 is the circuit structure signal of the ignition timing circuit of the prior art and the constant-power control circuit of belt current feedback
Figure.
Fig. 4 is the belt current of the embodiment of the present invention, the circuit structure of the constant-power control circuit of voltage ring feedback is illustrated
Figure.
Fig. 5 be the belt current of the embodiment of the present invention, voltage ring feedback power limitation control simplify the circuit structure of circuit
Schematic diagram.
Fig. 6 is the electrical block diagram of the first power supply circuit of the embodiment of the present invention.
Fig. 7 is the electrical block diagram of the output circuit of the embodiment of the present invention.
Fig. 8 is the electrical block diagram of the second power supply circuit of the embodiment of the present invention.
Fig. 9 is the Metal halogen lamp voltage and current waveform diagram of the embodiment of the present invention.
Specific embodiment
Referring to Fig. 1, it is the circuit block diagram of the embodiment of the present invention.
A kind of Metal halogen lamp ballast of constant-power control circuit of the present invention, comprising: the rectified current being sequentially connected electrically
Road 10, booster circuit 12, power control circuit and output circuit 30；The power control circuit include ignition timing circuit 20,
Constant-power control circuit 21 and reduction voltage circuit 22；The constant-power control circuit 21 is connect with booster circuit 12, the invariable power
Control circuit 21 is connect by reduction voltage circuit 22 with output circuit 30；The constant-power control circuit 21 includes current feedback loop
211 and voltage feedback loop 212；
Ignition timing circuit 20 generates high-voltage pulse by constant-power control circuit 21, lights a fire, is lighted a fire successfully for Metal halogen lamp
Afterwards, ignition timing circuit 20 stops working；The rectified circuit 10 of electric main, booster circuit 12 are converted to high voltage direct current and supply electricity to perseverance
Power control circuit 21 is depressurized to output circuit 30 using the reduction voltage circuit 22 in power control circuit and exports, the power
Control circuit realizes power limitation control in pressure reduction with electric current, voltage ring feedback.
Referring to Fig. 2, it is rectification circuit, circuit of power factor correction, the booster circuit of the embodiment of the present invention.
The rectification circuit 10 is that the alternating voltage of positive and negative variation is become unidirectional arteries and veins using the unilateral conduction of diode
The circuit of dynamic voltage.Under the action of AC power source, rectifier diode periodically on and off makes load obtain pulsation straight
Galvanic electricity.
In this application, rectification circuit 10 includes: filter inductance L1, filter capacitor C2 and rectifier bridge D3；Electric main with
The ac input end of filter inductance L1 and filter capacitor C2 parallel connection access rectifier bridge D3, the cathode output end ground connection of rectifier bridge D3,
The cathode output end series boosting circuit 12 of rectifier bridge D3.220V50Hz power frequency electric is rectified into the pulsating direct current unidirectionally conducted,
High-frequency Interference at different levels is filtered, avoids scurrying into power grid, the clutter from power grid is also filtered and avoids scurrying into ballast.
The filter inductance generally uses Ferrite Material, it combines in which can be convenient with feedthrough capacitor, is formed multiple
Filter is closed, in high performance filter, also using line around inductance.
The filter capacitor is to be connected in parallel on rectification power circuit output end, to reduce AC ripple ripple coefficient, smooth
A kind of energy storage device of direct current output.
The rectifier bridge is that four diodes of the bridge rectifier that will be connected are enclosed in together.
The booster circuit 12 is also Boost circuit, is using freewheeling diode, the electronic components such as boost inductance make electricity
Discharge voltage and supply voltage superposition are felt, so that voltage be made to increase.
In this application, booster circuit 12 includes: boost inductance T1B, switching tube Q1, sustained diode 1 and electrolytic capacitor
C11；The boost inductance T1B is in parallel between the drain electrode and source electrode of switching tube Q1 by the drain electrode of switching tube Q1 and source electrode ground connection
The sustained diode 1 and electrolytic capacitor C11；The anode of the electrolytic capacitor C11 and the cathode junction of sustained diode 1
For the power supply of invariable power circuit 21.Electrolytic capacitor C11 is energy-storage travelling wave tube, plays smothing filtering.Diode D1 plays afterflow, again
Claim freewheeling diode, connect with inductance T1B, provides the channel of release current when Q1 is turned off for T1B.Booster circuit 12 is by 220V
50Hz alternating current is upgraded to 400V direct current, supplies subsequent stages.
Referring to Fig. 4, it is the belt current of the embodiment of the present invention, the constant-power control circuit of voltage ring feedback.
Constant-power control circuit 21 of the present invention include: dual operational amplifier IC2, power factor correction controller IC3,
Integrating circuit, current feedback loop 211 and the voltage feedback loop 212 being made of first resistor R23 and first capacitor C24；Institute
The normal phase input end for stating dual operational amplifier IC2 is grounded by first capacitor C24, and it is defeated that first resistor R23 is connected to the positive
Enter between end and first capacitor C24, and accesses the comparator of power factor correction controller IC3 after connecting with the 5th resistance R30
Input terminal；DC power supply provides regulated power supply to dual operational amplifier IC2 and power factor correction controller IC3；Power factor
The zero passage detection end of correcting controller IC3 passes through the ground connection of zero passage detection winding T2A access power factor correcting controller IC 3
End；The triggering end of ignition timing circuit 20 is connected to the output end of dual operational amplifier IC2；Current feedback loop 211 is connected to
The current peak test side of power factor correction controller IC3；Voltage feedback loop 212 is connected to power factor correction controller
Between the multiplier input and ground terminal of IC3.
The dual operational amplifier is that two universal operational amplifiers are integrated on a monolithic, and two amplifiers are respective
Input, output, power supply and corrective capacity exit are easy to use.
In this application, dual operational amplifier type selecting are as follows: LM358.
In this application, the power factor correction controller type selecting is L6562 comprising inverting input terminal INV, compensation
End CS, zero passage detection input terminal ZCD, ground terminal are compared in output end COMP, multiplier reference voltage end MULT, comparator input
GND, driving stage gate driving output end GD, power end VCC.
It is current feedback if feedback quantity is directly proportional to output electric current in a feed circuit；If feedback quantity and output
Directly proportional voltage is then Voltage Feedback.It can usually be judged using load short circuits method.
Current feedback loop 211 of the present invention includes inductor winding T2B, first diode D2, the second capacitor C12, field
Effect pipe Q2 and the 4th resistance R3；The grid of the driving stage port concatenation field-effect tube Q2 of power factor correction controller IC3, field
The source electrode of effect pipe Q2 passes through the 4th resistance R3 and is grounded, the first pin of the drain electrode tandem electric inductance winding T2B of field-effect tube Q2,
The first pin of inductor winding T2B is electrically connected with first diode D2 anode, and the second pin of inductor winding T2B passes through the second electricity
Hold C12 and is connected to first diode D2 cathode；Output circuit is connected to the second both ends capacitor C12；
The current feedback loop 211 passes through the closed-loop gain of the resistance value or feedback loop that adjust the 4th resistance R3,
Change output power.Diode D2 is used as afterflow, provides discharge channel when Q2 is turned off for buck inductor T2B.Second capacitor C12
It is used as smothing filtering.
Voltage feedback loop 212 of the present invention includes buck inductor auxiliary winding T2C, the second diode D25, by the second electricity
Hinder bleeder circuit and filter capacitor C28 that R32 and 3rd resistor R29 is constituted；One end of the buck inductor auxiliary winding T2C connects
Between zero passage detection winding T2A and the ground terminal of power factor correction controller IC3, buck inductor auxiliary winding T2C's is another
End passes sequentially through anode, the cathode of the second diode D25, second resistance R32 and 3rd resistor R29 ground connection, PFC
The multiplier input of controller IC 3 is connected between second resistance R32 and 3rd resistor R29；Filter capacitor C28 is connected in parallel on
Three both ends resistance R29；
The voltage feedback loop 212 is sent into power factor correction controller IC3 by receiving voltage feedback signal
Multiplier and current feedback signal make multiplying, and as a result input comparator makees reference voltage, and current sampling signal is sent into power
Comparator in factor correcting controller IC 3 controls the switch of field-effect tube Q2 compared with reference voltage to maintain output power
Stablize.
It preferably, further include circuit of power factor correction 11 among rectification circuit 10 and booster circuit 12 of the present invention；
The circuit of power factor correction 11 includes: boost inductance T1B, switching tube Q1, power factor correction controller IC1；The liter
Voltage inductance T1A is connected between the zero passage detection end of power factor correction controller IC1 and ground terminal, the grid of the switching tube Q1
Pole is connected to the driving stage port of power factor correction controller.Circuit of power factor correction, abbreviation APFC, to improve power
Factor reduces the harmonic wave of input current, and stable 400V DC voltage is also provided for subsequent conditioning circuit.
Further, ignition timing circuit 20 of the present invention include when base integrated transporting discharging IC5, with when base integrated transporting discharging control
The igniting number of seconds of the electric discharge triggering electric arc tube in the ignition timing circuit 20 is made in given threshold, avoids continuing that high pressure occurs
Pulse damages ballast.
When described base integrated transporting discharging in the present invention type selecting be NE555, be belong to 555 series timing IC therein one
Kind model, only needs a small number of resistance and capacitor, can generate the pulse signal of various different frequencies needed for digit circuit.
Referring to Fig. 7, being the output circuit of the embodiment of the present invention.
Output circuit 30 of the present invention includes: output end OUT1 and OUT2, full-bridge circuit, series resonant circuit；It is described
Full-bridge circuit includes four field-effect tube Q3, Q4, Q5, Q6, grid drive chip IC7 and IC4；The driver of grid drive chip
Output end connects the grid of field-effect tube, is connected in parallel with a capacitor between the drain electrode and source electrode of field-effect tube, Metal halogen lamp is serially connected in grid
Between the driver output end of pole driving chip, output end two sides parallel filtering the capacitor C16 and C17, then height of connecting
Other side output end is connected in parallel to after pressure transformer T3A with series resonant circuit, the series resonant circuit is by inductance L3, capacitor
C15, high-tension transformer winding T3B are sequentially connected in series composition.
Type selecting is IMP3211 to the grid drive chip in the present invention, is high-voltage high-speed analog line driver, answers for half-bridge
With and design the independent output channel of high and low side.
Field-effect tube Q3, Q6 replace on-off with Q4, Q5, and supply Metal halogen lamp has the electric current of frequency and direction change, shape
It is square wave alternate up and down.Resonance potential is generated at the beginning of energization in T3B, is further boosted through auxiliary winding T3A, thousands of volts are generated
Pulse is added in fluorescent tube the two poles of the earth, this is ignition phase.Resonant tank loses condition of resonance after fluorescent tube conducting, and high-voltage pulse stops, and turns
Enter warm-up phase, finally enters stable working condition.Integrated circuit IC 4, IC7 control switch pipe Q3~Q6, coordinate two bridges
Arm replaces on-off, avoids common conduct.High-voltage capacitance C16, C17 are in parallel with fluorescent tube, filter out clutter caused by resonance.C14 is filtered out
Full-bridge clutter.
The present embodiment further includes small-sized reduction voltage circuit, is integrated circuit.It is divided into two-way, is shown in fig. 6 all the way
One power supply circuit, including Integrated circuit IC 6, transformer T4B, diode D17, electrolytic capacitor C10 export about 15V DC voltage
For booster circuit 12, the integrated circuit of power control electricity.Another way is the second power supply circuit shown in Fig. 8, including T4A,
Resistance R55, diode D5, electrolytic capacitor C13 are the integrated circuit of output circuit 30.
Rectification boosting circuit exports 400V direct current force feed to power control circuit from the end V+.Igniting is successfully entered preheating rank
Section, fluorescent tube D.C. resistance is small at this time, shows as that light tube electric voltage is low, and electric current is big.Field-effect tube Q2 conducting, then buck inductor T2B is held
It carries on a shoulder pole output voltage V+ (400V) and loads the pressure difference between (being similar to light tube electric voltage).First diode D2 reversely ends at this time,
T2B foot 5 is positive, and foot 8 is negative, and electric current rises, and flows through the Drain-Source of field-effect tube Q2, through the 4th resistance R3 to ground.The stage
Lamp power rise, not up to rated power.But lamp current is big, is converted into voltage by the 4th resistance R3, as detection signal warp
The foot 4 of R30 feeding IC3.One input terminal of comparator is connect inside foot 4, another input of comparator terminates multiplier outputs and one
A benchmark constant pressure source (representative value 1V).Detection signal is compared with this reference voltage, once more than reference voltage, then IC3
Foot 7 exports low level, turns off Q2.The reversion of buck inductor T2B polarity, foot 8 are positive, and foot 5 is negative.First diode D2 conducting, T2B
By D2 to the second capacitor C12 release current.T2B electric current is gradually reduced, and when dropping to zero, zero passage resonance occurs.Zero passage detection
Winding T2A is used for zero passage detection, measures zero cross signal, the foot 5 of IC3 is given by resistance R35.Then foot 7 exports high level, leads
Logical Q2, buck inductor T2B polarity invert again, and electric current is started from scratch rising, and D2 reversely ends, into next switch periods.
Since warm-up phase lamp current is big, current peak is restricted, and actual power is less than rated power, is protection fluorescent tube
Requisite measure, referred to as " overcurrent protection ".Invariable power circuit does not work during this.
Lamp power is also the output power of ballast, is denoted as Po, and modulating voltage, lamp current are denoted as Uo, Io and ballast
Output voltage, output electric current:
Po=UoIo (5.1)
They are the symmetrical waveforms of both forward and reverse directions, and approximate square waves are shown in Fig. 9.
Modulating voltage Uo rising, electric current Io decline are hankered in advance, and lamp power P o rises, this characteristic is referred to as " negative resistance ".Power P o
When rising close to rated power, lamp current, which is down to, is not enough to cause overcurrent protection, and invariable power circuit starts to act on, into stabilization
Working condition, this is the main operational phases of Metal halogen lamp, for illuminating.
Positive resistance state is presented in the resistance of fluorescent tube in steady-working state, i.e. pipe pressure increases electric current and also increases.Know from formula (5.1)
Invariable power requires the product constant of Po, that is, Uo and Io, rather than Uo, Io are constant.This is to be different from common constant voltage source, also not
It is same as in place of LED constant current power supply.
Referring to Fig. 3, it is in the prior art only with the invariable power circuit of current feedback.
Resistance R32, R29 constitute divider, are above terminated at VCC (about 15V), this is the pressure stabilizing electricity for aiming at integrated circuit offer
Source.The junction R32, R29 is divider node, connects IC foot 3, is one of input terminal of internal multiplier.VCC voltage is constant, point
Depressor give foot 3 voltage be also it is constant, it provides constant reference voltage only for current signal, does not play feedback effect.
Only one Current Negative Three-Point Capacitance of the circuit.When Q2 is connected, D2 reversely ends, and the electric current in T2B rises, through Q2 leakage-
Source electrode flows through sampling resistor R3, is converted to voltage signal, with current signal at than.
R3 both end voltage and current relationship UR3=IR3R3.(5.2)
R3 also represents the resistance value of resistance R3.Since T2B, Q2, R3 connect, invariable power circuit major loop is constituted, IR3 is exactly this
The electric current of a major loop, UR3 are the feedback signals of main circuit current.The signal divides two-way to transmit: sending all the way through R30 to IC3's
Foot 4, another way are sent through resistance R23 to the foot 3 of IC2.
The foot 1 that IC3 is given after feedback signal amplification, is compared with internal reference voltage VER, obtains error signal and is sent into
Internal error amplifier amplifies.Multiplier inside amplified signal feeding, samples from voltage divider signal with foot 3 and is multiplied,
It exports to internal comparator reverse input end, is compared with Current feedback voltage UR3, when determining the shutdown of switching tube Q2
It carves, output power is adjusted with this, realizes power invariability.In L6562, VER=2.5 ± 0.035V.R23 and first capacitor C24
Integrating circuit is constituted, forms voltage UC24, the input signal as amplifier on C24.Theoretical analysis shows that: UC24 average value with
The average value of main circuit current IR3 is directly proportional, also directly proportional to lamp power:
WhereinIt is average value of the U24 between a switch periods, T is switch periods, and ton is field-effect tube Q2 conducting
Time.IR3 is the electric current of the 4th resistance R3, is the function of time.T is time variable.Duty ratio is indicated with D, then
The closed-loop gain A of lamp power P o and reference voltage VER, feedback loop inside prime output voltage U1, IC3
It is related.
U1 is the output voltage of PFC, representative value 400V.VER, U1, A, R3 are all constant, and lamp power P o is only
It is related with these constants, and it is unrelated with the variable of fluorescent tube, so Po is also constant.Adjust resistance value R3 or A, thus it is possible to vary function
Rate.Using major loop conducting electric current IR3 to the proportional relation of the integral and Po of time, power is indirectly controlled by current feedback
It is the theoretical basis of power limitation control.Formula (5.5) is only strictly set up in perfect condition, actually since the interference of factors is sent out
Raw some deviations.If there are clutters by other parts interference for integrating circuit, there is electric leakage when field-effect tube Q2, diode D2 end
Stream, the resonance of switching moments field-effect tube junction capacity and inductance all influence the stabilization of lamp power.When ballast local environment temperature
On 87 DEG C, lamp power is on the rise, and it is obvious to be higher than 93 DEG C of power rises.If Metal halogen lamp work it is hot nonventilatedly
Side, may cause temperature excessively high because internal heat dissipating is unsmooth, cause power rise, and further initiation temperature rises, so pernicious to follow
Ring can then shorten service life even damage rapidly.
The present embodiment increases a negative voltage feedback, realizes that voltage, current double-ring are anti-using the multiplier inside L6562
Lamp power is further stablized in feedback.
As shown in figure 4, being the constant-power control circuit of the belt current of the embodiment of the present invention, voltage ring feedback.
Increase a winding T2C in buck inductor T2 and is used as lamp voltage sample.The main winding T2B of T2 passes through during Q2 is turned off
D2 discharges to the second capacitor C12, provides steady voltage to successive load through C12 smothing filtering.When due to full-bridge Q3~Q6 conducting
Pressure drop it is negligible, so the output voltage UC12 ≈ Uo of power control circuit.As shown in Figure 4 during field-effect tube Q2 shutdown,
The voltage UT2Boff of T2B electric discharge are as follows:
UT2Boff=VF+UC12=VF+Uo ≈ Uo (6.1)
VF is diode forward conducting voltage in formula, and fast recovery diode VF about 1V is much smaller than Uo, can ignore.If electric
The main winding T2B the number of turns for feeling T2 is NT2B, and auxiliary winding T2C the number of turns is NT2C, then the induced voltage UT2Coff of T2C when Q2 is turned off
Such as following formula:
Or
T2C foot 2 is positive at this time, the second diode D25 conducting.It is that IC foot 3 provides modulating voltage through resitstance voltage divider R32, R29
Sampled signal UR29.
VFD25 is D25 forward conduction voltage, about 0.7V in formula.Appropriate selection R29, R32 ratio and T2C the number of turns, can neglect
The slightly conduction voltage drop of D25.Above formula is simplified to
It is thus found that divider, which obtains voltage UR29 from resistance R29, is proportional to modulating voltage Uo, its feedback as modulating voltage
Signal is sent into the foot 3 of IC3, which connects one input terminal of multiplier.Capacitor C28 filters clutter, mitigates interference, also adjustment response speed
Degree.
During Q2 is connected, T2B polarity reversion, foot 5 is positive, and major loop charges to it, and electric current rises.The reversion of T2C polarity, foot
3 are positive, and foot 2 is negative, and D25 reversely ends, and separate the negative level of T2C, avoid interference multiplier.
Negative voltage feedback loop includes: buck inductor auxiliary winding T2C, diode D25, divider resistance R29, R32, capacitor
C28, multiplier (among IC3).
Current feedback signal be sent into IC3 foot 1, by internal error operational amplifier amplify and swing to (negative terminal input,
Output and input inverse change), it is sent into multiplier one end, makees multiplying with voltage feedback signal UR29.Operation result is given
Comparator is as the reference voltage.The sampled signal of main circuit current is sent into comparator from the foot 4 of IC3, is compared with reference voltage
Compared with control field-effect tube Q2 switch maintains output power Po to stablize.
Voltage loop feedback procedure is: certain reason (such as temperature) causes power of lamp tube increase → pipe pressure Uo to also become larger → electricity
Sense auxiliary winding induced voltage UT2Coff rising → divider node voltage UR29 rising → multiplier output level rises → is compared
Device reference level rising → switching tube increases turn-on time → 1 voltage of IC3 foot and rises → through internal error operation amplifier and swing to
→ multiplier output level shortens turn-on time → reduction electricity than decline → Q2 at double than decline → comparator reference level at double
Stream peak value → reduction lamp power → power invariability.
The decline of lamp power, then feed back and carry out in the opposite direction, finally still maintains power invariability.
This patent is one feedback control loop-negative voltage feedback of increase, and the multiplier in L6562 is utilized to realize electric current, electricity
Ring feedback is pressed, makes Po variation by stronger inhibition, power is more stable.
Another embodiment of the present invention is saved on the basis of the electric current, voltage ring feedback constant-power control circuit
Buck inductor auxiliary winding T2C shares a winding T2A with zero passage detection, as shown in figure 5, principle is same as above.Advantage is to reduce one
Winding can reduce cost；The disadvantage is that: an easily causes Voltage Feedback and interferes with each other with zero passage detection；Two, the number of turns share, cannot
Arbitrarily change feedback voltage, debugging is restricted.
Two kinds of embodiment circuits of the invention are all in patent coverage area.This patent further includes but is not limited to other high pressures
The electric ballast of gas-discharge lamp (such as high-pressure sodium lamp), including but not limited to illuminating product also include the permanent function of other aspects
Rate control circuit.L6562 is more used for active power factor correction, and multiplier is a part of L6562, and this patent is exactly abundant
Patent purpose is realized using this part.Multiplier used includes but is not limited to L6562, also includes independent multiplier or other
The multiplier of model IC interior.
Compared with the existing technology, the present invention is using multiplier is carried in power factor correction controller, by increasing by one
Voltage negative feedback loop makes Metal halogen lamp ballast working condition reach voltage, current double-ring feedback, can reduce existing Metal halogen lamp town
Stream device is influenced by excessively high caused power rise of temperature etc., extends the service life of Metal halogen lamp ballast.
The invention is not limited to above embodiment, if not departing from the present invention to various changes or deformation of the invention
Spirit and scope, if these changes and deformation belong within the scope of claim and equivalent technologies of the invention, then this hair
It is bright also to change and deform comprising these together.
Claims (9)
1. a kind of Metal halogen lamp ballast of constant-power control circuit, it is characterised in that: including rectification circuit, the liter being sequentially connected electrically
Volt circuit, power control circuit and output circuit；The power control circuit includes constant-power control circuit, ignition timing circuit
And reduction voltage circuit；The constant-power control circuit is connect with booster circuit, the constant-power control circuit by reduction voltage circuit with
Output circuit connection；The constant-power control circuit includes current feedback loop and voltage feedback loop；
Ignition timing circuit generates high-voltage pulse by constant-power control circuit, lights a fire for Metal halogen lamp, and after lighting a fire successfully, igniting is fixed
When circuit stop working；The rectified circuit of electric main, booster circuit are converted to high voltage direct current and supply electricity to invariable power circuit, using
Reduction voltage circuit in power control circuit is depressurized to output circuit output, and the power control circuit is in pressure reduction with electricity
Stream, voltage ring feedback realize power limitation control.
2. a kind of Metal halogen lamp ballast of constant-power control circuit according to claim 1, it is characterised in that: the perseverance function
Rate control circuit includes: dual operational amplifier, power factor correction controller, the integral being made of first resistor and first capacitor
Circuit, current feedback loop and voltage feedback loop；The normal phase input end of the dual operational amplifier is grounded by first capacitor,
First resistor is connected between the normal phase input end and first capacitor, and is connected and be followed by into PFC with the 5th resistance
The input terminal of the internal comparator of controller；DC power supply provides pressure stabilizing to dual operational amplifier and power factor correction controller
Power supply；The zero passage detection end of power factor correction controller is connect by zero passage detection winding access power factor correcting controller
Ground terminal；The triggering end of ignition timing circuit is connected to the output end of dual operational amplifier；Current feedback loop be connected to power because
The current peak test side of number correcting controller；Voltage feedback loop is connected to the multiplier input of power factor correction controller
Between end and ground terminal.
3. a kind of Metal halogen lamp ballast of constant-power control circuit according to claim 2, it is characterised in that: the electric current
Feedback loop includes inductor winding, first diode, the second capacitor, field-effect tube and the 4th resistance；Power Factor Correction Control
The grid of the driving stage port concatenation field-effect tube of device, the source electrode of field-effect tube pass through the 4th resistance and are grounded, field-effect tube
First pin of drain electrode tandem electric inductance winding, the first pin of inductor winding are electrically connected with first diode anode, inductor winding
Second pin by the second capacitance connection to first diode cathode；Output circuit is connected to the second capacitor both ends；
The current feedback loop changes output work by adjusting the resistance value of the 4th resistance or the closed-loop gain of feedback loop
Rate.
4. a kind of Metal halogen lamp ballast of constant-power control circuit according to claim 3, it is characterised in that: Voltage Feedback
Circuit includes buck inductor auxiliary winding, the second diode, the bleeder circuit being made of second resistance and 3rd resistor and filtered electrical
Hold；One end of the buck inductor auxiliary winding be connected to zero passage detection winding and power factor correction controller ground terminal it
Between, the other end of buck inductor auxiliary winding passes sequentially through the anode of the second diode, cathode, and second resistance and 3rd resistor connect
The multiplier input on ground, power factor correction controller is connected between second resistance and 3rd resistor；Filter capacitor is in parallel
At 3rd resistor both ends；
The voltage feedback loop is by receiving the multiplier and electricity that voltage feedback signal is sent into power factor correction controller
Stream feedback signal makees multiplying, and as a result input comparator makees reference voltage, and current sampling signal is sent into PFC control
Comparator in device processed controls the switch of field-effect tube compared with reference voltage to maintain stable output power.
5. a kind of Metal halogen lamp ballast of constant-power control circuit according to claim 1, it is characterised in that: the rectification
Circuit includes: filter inductance, filter capacitor and rectifier bridge；Electric main access rectifier bridge in parallel with filter inductance and filter capacitor
Ac input end, rectifier bridge cathode output end ground connection, the cathode output end series boosting circuit of rectifier bridge.
6. a kind of Metal halogen lamp ballast of constant-power control circuit according to claim 1, it is characterised in that: the boosting
Circuit includes: boost inductance, switching tube, freewheeling diode and electrolytic capacitor；The boost inductance by the drain electrode of switching tube and
Source electrode ground connection, the freewheeling diode and electrolytic capacitor in parallel between the drain electrode and source electrode of switching tube；The electrolytic capacitor is just
Pole and the cathode junction of freewheeling diode are invariable power circuit power supply.
7. according to a kind of described in any item Metal halogen lamp ballasts of constant-power control circuit of claim 5 or 6, feature exists
In: it further include circuit of power factor correction among the rectification circuit and booster circuit；The circuit of power factor correction includes:
Boost inductance, switching tube, power factor correction controller；The zero passage detection winding of the boost inductance is connected to power factor school
Between the zero passage detection end of positive control device and ground terminal, the grid of the switching tube is connected to the drive of power factor correction controller
Move extreme mouth.
8. a kind of Metal halogen lamp ballast of constant-power control circuit according to claim 1, it is characterised in that: the igniting
Base integrated transporting discharging when timing circuit includes, with when base integrated transporting discharging control the electric discharge in the ignition timing circuit triggering electric arc tube
Igniting number of seconds in given threshold, avoid continue occur high-voltage pulse damage ballast.
9. a kind of Metal halogen lamp ballast of constant-power control circuit according to claim 1, it is characterised in that: the output
Circuit includes: output end, full-bridge circuit, series resonant circuit；The full-bridge circuit includes a plurality of field-effect tube, gate driving
Chip；The grid of the driver output end connection field-effect tube of grid drive chip, between the drain electrode and source electrode of field-effect tube simultaneously
Join a capacitor, Metal halogen lamp is serially connected between the driver output end of grid drive chip, output end two sides parallel filtering
Other side output end, the series resonant circuit are connected in parallel to series resonant circuit after capacitor, then high-tension transformer of connecting
It is sequentially connected in series and is constituted by inductance, capacitor, high-tension transformer winding.
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| CN201811407890.2A CN109348604B (en) | 2018-11-23 | 2018-11-23 | Metal halide lamp ballast of constant power control circuit |
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|---|---|---|---|
| CN201811407890.2A CN109348604B (en) | 2018-11-23 | 2018-11-23 | Metal halide lamp ballast of constant power control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111542156A (en) * | 2020-05-13 | 2020-08-14 | 马少峰 | Dimmable LED constant current source driving circuit |
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| CN109348604B (en) | 2023-09-19 |
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