CN102186297A - Control method and device for preheating lamp filament of preheating cathode type fluorescent lamp before starting - Google Patents
Control method and device for preheating lamp filament of preheating cathode type fluorescent lamp before starting Download PDFInfo
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- CN102186297A CN102186297A CN2011100242721A CN201110024272A CN102186297A CN 102186297 A CN102186297 A CN 102186297A CN 2011100242721 A CN2011100242721 A CN 2011100242721A CN 201110024272 A CN201110024272 A CN 201110024272A CN 102186297 A CN102186297 A CN 102186297A
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Abstract
The invention provides a control method and device for preheating lamp filament of preheating cathode type fluorescent lamp before starting. According to the method, a current converter with a primary winding, a preheating lamp filament winding and a control winding is wound on a magnetic core with high magnetic permeability, wherein the primary winding is connected in series with an inductor or capacitor of an output resonant circuit of a fluorescent lamp electronic ballast so that the preheating lamp filament winding is connected with the lamp filament of the fluorescent lamp; and the control winding is controlled to be open or short-circuited by low impedance through a control circuit so that the working state of the current converter is changed and the current of the lamp filament is controlled. The device comprises a current converter and is characterized in that: a primary winding, two preheating lamp filament windings with the same turns and a control winding are wound on the magnetic core with high magnetic permeability of the current converter, wherein the primary winding is connected in series with a choking inductor of the fluorescent lamp electronic ballast; and the two preheating lamp filament windings are respectively connected with two filaments of the fluorescent lamp through two blocking capacitors. Through the invention, the problems of the preheating lamp filament of the existing fluorescent lamp are solved.
Description
Technical field
The invention belongs to the technical field that drives low-pressure gaseous discharge lamp with electric ballast, particularly the control method and the device of preheating cathode type fluorescent lamp preheating filament before startup.
Background technology
For making preheating cathode type fluorescent lamp (hereinafter to be referred as fluorescent lamp) reach designed life, must be before startup to the filament of fluorescent lamp by certain value electric current and keep certain hour and heat its negative electrode, when negative electrode reaches the temperature that is beneficial to emitting electrons most, improve rapidly the fluorescent lamp terminal voltage to starting resistor fluorescent lamp lighting.In order to raise the efficiency and prolong the life-span of negative electrode, except that the fluorescent lamp of tunable optical, should reduce heater current as much as possible after lighting in addition.
In recent years under the overall background of energy-saving and emission-reduction, high-power fluorescent lamp is with its high light efficiency, high color rendering index (CRI) and high performance-price ratio, and in open places such as supermarket, workshops, progressively substituting inefficient mercury vapor lamp etc. becomes the main flow lighting source.By the structure branch, high-power fluorescent lamp can be divided into integrated lamp and split lamp two big classes.
Integrated lamp is that electric ballast and fluorescent lamp are assembled into an inseparable integral body, and is easy to install.But since when work the heat that sends of fluorescent tube add and the power consumption of electric ballast itself components and parts on the electric ballast worked under hot environment for a long time that so the power of integrated lamp can not do too highly, otherwise can reduce useful life greatly.
The split lamp is made up of electric ballast and two relatively independent parts of fluorescent lamp element, the interconnection mode of these two parts, and the most generally electric ballast band E40 lamp socket, fluorescent lamp element dress E40 lamp holder are realized both assemblings and are electrically connected at present.Usually all there is lampshade to separate in the middle of both in actual use, the actual work temperature of electric ballast is greatly reduced.Compare with integrated lamp, the advantage of split lamp is obvious: the one, and power can be done greatlyyer; The 2nd, electric ballast is under low working temperature environment, by prior art design produce the mean free error time reach several ten thousand hours electric ballast be without a doubt, when only being the fluorescent lamp element inefficacy, it is just passable only to change fluorescent lamp element, greatly reduces use cost.
But the thing followed is how effectively to realize starting the preceding preheating filament problem of fluorescent lamp.Because E40 is the connector of two electrodes, some are effective preheating filament circuit in electronic ballast for fluoresent lamp, comprises some existing patent preheating filament schemes, and the difficulty that all seems under this condition is had place to show one's prowess.From essence, at present the preheating filament method is exactly two kinds of frequency converting and preheating and semistor (comprise intelligent positive temperature coefficient temperature-sensitive electricity group, below all abbreviate PTC as) preheatings substantially.As everyone knows, the shortcoming of frequency converting and preheating is after fluorescent lamp is lighted, and filament all has considerable electric current to pass through always, and the power consumption that produces on the filament had both reduced the efficient of whole lamp, had shortened the life-span of negative electrode again; PTC preheating scheme is used on the high-power fluorescent lamp, the power consumption that lamp is lighted back PTC adds the heat that fluorescent tube produces, it is taller when the temperature ratio of PTC body is used in the small-power integrated lamp, and the operating voltage at the lifetime fluorescent lamp raises gradually, cause the temperature of PTC also to increase, aggravate the inefficacy process of PTC, finally caused the inefficacy in advance of fluorescent tube assembly.Just because of not resolving the preheating filament problem, be far from reaching desired value the useful life of present high-power split lamp, becomes its major reason using at the wide model of Green Lighting Project of restriction.
Summary of the invention
The purpose of this invention is to provide for fluorescent lamp and before startup, realize preheating filament, make heater current drop to an almost negligible value after starting, and technology is simple, superior performance is reliable, loss is low, the preheating filament control method and the device that mate with the fluorescent lamp of various electrical quantitys easily.
Technical scheme provided by the invention for achieving the above object is: preheating cathode type fluorescent lamp control method of preheating filament before startup is, one on the high magnetic permeability magnetic core coiling have the power pack of elementary winding, preheating filament winding, control winding, wherein, the inductance or the capacitances in series in the export resonance loop of elementary winding and electronic ballast for fluoresent lamp, the preheating filament winding connects Filament of fluorescent lamp; Make control winding open circuit or, make the operating state of power pack be changed and then control heater current by control circuit by the Low ESR short circuit.
The operating state change of described power pack is meant that when preheating filament the control winding is opened a way, and power pack is transferred to the preheating filament winding to the current transformation that flows through elementary winding to filament pre-heating; After lighting fluorescent lamp, make the control winding by the Low ESR short circuit by control circuit, heater current is eased down to one and can uncared-forly be worth.
The present invention also provides the control device of a kind of preheating cathode type fluorescent lamp preheating filament before startup, include power pack, it is characterized in that: be wound with two preheating filament windings and a control winding of an elementary winding, equal turn numbers on the high magnetic permeability magnetic core of power pack, elementary winding is connected with the choke induction of electronic ballast for fluoresent lamp; Two preheating windings connect two filaments of fluorescent lamp respectively through two capacitances; Two outputs of control winding connect the main end of bidirectional triode thyristor respectively; The control winding is open-circuit condition when bidirectional triode thyristor ends; When the bidirectional triode thyristor two-way admittance, the control winding is by the low on-resistance short circuit between the main end of bidirectional triode thyristor.
Also include a sample resistance of connecting with fluorescent lamp, voltage doubling rectifing circuit with voltage multiplying rectifier element composition, voltage doubling rectifing circuit is to the voltage voltage multiplying rectifier on the sample resistance, rectifier output voltage is added between the gate pole and main end of bidirectional triode thyristor, as The Trigger of Bidirectional Triode Thyristor voltage through current-limiting resistance; When fluorescent tube was not lighted, the voltage multiplying rectifier output voltage was zero, and bidirectional triode thyristor ends; Behind the lamp tube starting, the absolute value of voltage multiplying rectifier output voltage is higher than the trigger voltage of bidirectional triode thyristor gate pole, the bidirectional triode thyristor two-way admittance.
The present invention also provides the scheme of another kind of preheating cathode type fluorescent lamp control device of preheating filament before startup, be wound with two preheating filament windings and a control winding of an elementary winding, equal turn numbers on the high magnetic permeability magnetic core of power pack, the startup capacitances in series of elementary winding and fluorescent lamp; Two secondary winding connect two filaments of fluorescent lamp through capacitance respectively; Two outputs of control winding are connected to two inputs of rectifier bridge respectively, and the high-frequency ac voltage of control winding is converted to unidirectional high-frequency pulse voltage output through rectifier bridge, and positive output connects the collector electrode of NPN triode, negative output sending and receiving emitter-base bandgap grading.When the NPN triode ended, the control winding was open-circuit condition; During NPN triode saturation conduction, the control winding is by the collector electrode of the forward conduction resistance of rectifier bridge series connection NPN triode, the saturation conduction resistance short circuit between the emitter.
Also include a sample resistance of connecting with fluorescent lamp, the voltage doubling rectifing circuit of forming with the voltage multiplying rectifier element is to the voltage voltage multiplying rectifier on the sample resistance, rectification output is added between the base stage and emitter of NPN triode, as the driving voltage of NPN triode through current-limiting resistance; When fluorescent tube was not lighted, the voltage multiplying rectifier output voltage was zero, and the NPN triode ends; Behind the lamp tube starting, voltage multiplying rectifier output provides enough drive currents, makes the NPN triode enter the saturation conduction state.
The scheme of above-mentioned two kinds of preheating cathode type fluorescent lamps control device of preheating filament before startup, before starting fluorescent lamp in the preheating filament process, heater current is directly proportional with the primary current of power pack, is directly proportional with the turn ratio of elementary umber of turn to the preheating filament umber of turn; After having lighted fluorescent lamp, heater current is directly proportional with the output end voltage of control winding, is directly proportional with the turn ratio of preheating filament umber of turn to the control umber of turn, is inversely proportional to the filament equivalent resistance.
After adopting technique scheme, the present invention has following beneficial effect.
What solved present minute body structure drives the problem that the preheating filament of high-power fluorescent lamp exists always with electric ballast more satisfactoryly, has greatly prolonged its useful life, its wide model in Green Lighting Project is used will be played positive impetus.
The reliability height.Implement device low in energy consumption helps long-time steady operation.And used components and parts all are that various equivalent modifications is familiar with very much, can carry out performance and reliability testing, analysis and check with instrument, method, the means of routine to the finished product of design result and production, guarantee reliability of products with technological means.
Realize easily.Operation principle clear and definite, clear but and uncomplicated, help the designer and carry out scientific and reasonable design at the fluorescent lamp of various parameters; Used all is common, maturation, the easy components and parts in source, and designer's design and select material is very convenient, is beneficial to popularize.
Applied widely.Apparatus of the present invention have only been used the not high components and parts of several prices, because its excellent properties can prolong the useful life of light fixture greatly, integrated cost is low.Except the high-power fluorescent lamp that can be applicable to the branch body structure, be equally applicable to other lighting device to the electric ballast driving fluorescent lamp of the reliability of preheating filament process and effect requirements height, various structures.
Description of drawings
Fig. 1 is the control device one preferred embodiment electrical schematic diagram of preheating cathode type fluorescent lamp of the present invention preheating filament before startup.
Another preferred embodiment electrical schematic diagram of control device of Fig. 2 preheating cathode type of the present invention fluorescent lamp preheating filament before startup.
Embodiment
Embodiment one
Referring to accompanying drawing 1, feature of the present invention can obtain the embodiment of most worthy on the split lamp of following statement, it is made up of two unit that structure is relatively independent, parameter is mated mutually, i.e. the fluorescent tube assembly 2 of the fluorescent lamp of the electric ballast 1 of unit one band frequency converting and preheating functions and unit diad lamp.
Unit one is the electric ballast that frequency converting and preheating functions is typically arranged.Be the feature that outstanding preheating filament starts, only draw semi-bridge inversion switch Q1, Q2, capacitance C1, choke induction L1, remainder block representation.
Unit two is fluorescent tube assemblies of split lamp, and the electric components that comprises has: have the fluorescent lamp LAMP of two filament F1, F2, resonant capacitance C2 has an elementary winding CT
PWith two preheating filament winding CT
S1, CT
S2And control winding CT
S3Power pack CT, fluorescent lamp current sampling resistor R1, voltage multiplying rectifier element D1, D2, C3, bidirectional triode thyristor TRIAC triggers current-limiting resistance R2, filter capacitor C4, filament capacitance C5, C6.
Series resonance and power delivery: resonant capacitance C2 and elementary winding CT
PBe connected to the output port of unit one electric ballast after the series connection, constitute series resonant tank with choke induction L1.Fluorescent lamp LAMP be parallel to resonant capacitance C2 after sample resistance R1 connects, accept the driving of semi-bridge inversion output through choke induction L1, resonant capacitance C2 resonant tank.
Preheating filament: preheating filament winding CTs1, CT
S2Be connected to filament F1, F2 through filament capacitance C5, C6 respectively, constitute two filament pre-heating loops.
Preheating filament control: C4 is parallel between the gate pole G and main end T1 of bidirectional triode thyristor TRIAC, and trigger voltage is strobed; Voltage multiplying rectifier element D1, D2, C3 form voltage doubling rectifing circuit, to the sampling voltage rectification on the sample resistance R1, are added to the gate pole of bidirectional triode thyristor TRIAC after triggering current-limiting resistance R2 current limliting; The main end T1 of bidirectional triode thyristor TRIAC is connected to the common port of sample resistance R1 and voltage multiplying rectifier element D1, just becomes the triggering source of bidirectional triode thyristor TRIAC like this behind the voltage voltage multiplying rectifier on the sample resistance R1.As principal character of the present invention, with present difference with power pack preheating filament circuit, power pack CT also has a control winding CT
S3, its two pins meet main end T1, the T2 of bidirectional triode thyristor TRIAC respectively, and purpose is to make the operating state of power pack CT pass through CT
S3Be subjected to the control of bidirectional triode thyristor TRIAC.
Symbol CON1, CON2 between unit one and the unit two, the two-port output of expression fluorescent tube assembly and electric ballast is to realize electric interconnection by two electrode connectors (as the E40 lamp holder).
Have the power pack preheat fluorescent lamp filament operation principle of controlling winding
Because principal character of the present invention, be embodied in deep understood have control winding CT
S3The electromagnetic property of power pack CT after, rationally dexterously it is applied in the preheating filament process of fluorescent lamp, therefore be necessary earlier power pack CT to be done concise and to the point analysis explanation in the electromagnetic property under the different condition.
The structure of power pack CT and assumed condition.Power pack CT is the magnetic core coiling with high μ value, the little magnetic material of high-frequency loss, and an elementary winding CT is arranged
PWith three secondary winding: preheating filament winding CT
S1, preheating filament winding CT
S2, control winding CT
S3, the number of turn of each winding is followed successively by N
P, N
S1, N
S2And N
S3, and N
S1=N
S2, N
S3Be N
PAnd N
S1Several times more than.For making conclusion more clear, under the prerequisite that does not influence conclusion character, following analysis hypothesis power pack CT is an ideal current converter, promptly elementary winding CT
PIt is zero exciting current; Zero leakage flux; Magnetic core has infinitely great magnetic flux density; Internal resistance, the distributed capacitance of ignoring core loss and each winding; The equivalent resistance R of filament F1, F2
F1, R
F2Be pure resistance and R
F1=R
F2=R
FFilament capacitance C5, C6 get enough big value, make its capacitive reactance much smaller than R
F, CT like this
S1, CT
S2Load be both R
F
Bidirectional triode thyristor by and heater current when not lighting fluorescent lamp.Elementary winding CT
PBy high-frequency current, fluorescent lamp LAMP is not lighted does not have electric current to pass through, if this moment, bidirectional triode thyristor TRIAC ended CT
S3Be equivalent to open circuit, then have:
N
P×I
p?=N
S1×I
F1?＋N
S2×I
F2
I
p=I
F1/n1＋I
F2/n2
I in the formula
p--winding CT
PThe effective value of electric current
I
F1The effective value of-filament F1 electric current
I
F2The effective value of-filament F2 electric current
N1-N
PWith N
S1Ratio N
P/ N
S1
N2-N
PWith N
S2Ratio N
P/ N
S2
Because N
S1=N
S1So, n1=n2:
I
p=（I
F1＋I
F2）/n1
Again because R
F1=R
F2=R
F, then have:
I
F1=I
F1=I
F
I
p=2I
F/n1
I
F=?n1×I
P/2 （1-1）
Formula (1-1) shows, bidirectional triode thyristor TRIAC by and fluorescent lamp LAMP when not lighted, heater current I
FWith primary current I
PAnd turn ratio n1 is directly proportional.
Heater current during the bidirectional triode thyristor conducting.Elementary winding CT
PBy high-frequency current, as if bidirectional triode thyristor TRIAC two-way admittance this moment, control winding CT
S3Induced potential produce electric current I
TBy main electrode T1 and the T2 of bidirectional triode thyristor TRIAC, control winding CT
S3Terminal voltage be bidirectional triode thyristor TRIAC conducting voltage V
T, " volt/circle " value that power pack CT goes up each winding is all V
T/ N
S3, heater current is:
I
F=（V
T/N
S3）×N
S1/Rf
I
F=（N
S1/N
S3）×V
T/Rf （1-2）
Formula (1-2) demonstration, when bidirectional triode thyristor TRIAC conducting, heater current I
FWith N
S1/ N
S3And bidirectional triode thyristor TRIAC conduction voltage drop V
TBe directly proportional, Rf is inversely proportional to the filament equivalent resistance.By V-I characteristic of bidirectional triode thyristor TRIAC as can be known, the dynamic electric resistor after the bidirectional triode thyristor TRIAC conducting between its main electrode T1 and the T2 is very little, I
TAt its limit value I
TSMV when changing in the scope
TValue have only the variation of several volts at zero point, available representative value V
T=1.5V
Estimate.
The conducting electric current of bidirectional triode thyristor
Bidirectional triode thyristor TRIAC has during conducting:
N
P×I
p?=2×N
S1×I
F?＋N
S3×I
TRMS
I
TRMS?=（N
P×I
p?－2×N
S1×I
F）/N
S3
I in the formula
TRMSThe effective value of-controllable silicon conducting electric current
I
TRMSMaximum be:
I
TRMS_MAX?=I
p×N
P/N
S3 （1—3）
Formula (1-3) shows, the maximum I of bidirectional triode thyristor TRIAC conducting current effective value
TRMS_MAX, with I
pAnd N
PBe directly proportional, with N
S3Be inversely proportional to.So I
TRMS_MAXCan be by adjusting no-load voltage ratio N
P/ N
S3Controlled, and then make the conduction loss of bidirectional triode thyristor TRIAC drop to a very low level.
Magnetic core state during the bidirectional triode thyristor conducting
" volt/circle value " of each winding of power pack CT is V during bidirectional triode thyristor TRIAC two-way admittance
T/ N
S3, elementary winding CT
PTerminal voltage be:
V
CTP=?V
T×N
P/N
S3
According to the law of electromagnetic induction, the magnetizing inductance L that power pack CT is elementary
MThe absolute value of the self-induced e.m.f that produces equals its terminal voltage V
CTPAbsolute value.Although actual L
MBe finite value, by choose reasonable ratio N
P/ N
S3, can make V
CTPDrop to a very low value, the magnetic flux amplitude of oscillation of magnetic core is very little among the corresponding current converter CT, makes that the loss of magnetic core is also very low.
The application of power pack in preheating filament of band control winding
Mentality of designing is: when preheating filament, bidirectional triode thyristor TRIAC is ended, the size of heater current is determined by formula (1-1).Because fluorescent lamp is not also lighted and be can be used as open circuit, this moment power pack CT CT
PElectric current I
pMainly by the preheating driving frequency of operating voltage VBUS, ballast, choke induction L1, capacitance C1, and return loss decision; Press the size of filament resistance Rf, balance is selected warm-up time and preheat curent; Adjust number of turn N
P, N
S1And turn ratio N
P/ N
S1Just can obtain required preheat curent.
Behind fluorescent lamp lighting, in time open bidirectional triode thyristor TRIAC, heater current is provided by formula (1-2), V
TRepresentative value about 1.5V, press Rf size behind the fluorescent lamp lighting, choose reasonable ratio N
S1/ N
S3, heater current I
FBe controlled at and be low to moderate almost negligible level.
Provide the concrete implementation step that the present invention realizes the preceding preheating filament of fluorescent lamp starting below.
Warm-up phase
When preheating filament, inverse switch Q1, the Q2 of electric ballast open in turn, close under the driving of control Driver Circuit, the HF switch output that produces is applied to by the capacitance C1 on the electric ballast, choke induction L1 the resonant capacitance C2 on the fluorescent lamp element, elementary winding CT
PThe resonant tank that is composed in series.Preheating HF switch frequency f
PHShould be higher than the humorous loop of the string free oscillation frequency f that mainly determines by choke induction L1 and resonance capacitor C 2
0, making inverse switch Q1, Q2 is that no-voltage is open-minded, reduces its switching loss.At the high frequency voltage V that guarantees on the C2
C2Be lower than starting resistor and avoid fluorescent lamp to be in glow discharge simultaneously and cause under the shallow prerequisite of penetrating of cathode electronics powder f
PHValue the electric current in the humorous loop of string is suitably improved, be beneficial to enough energy power supply rheology parallel operation CT and be transferred to the secondary winding preheating filament.Because fluorescent lamp is not also lighted and be can be used as open circuit, does not have electric current to pass through sampling current R1, the gate pole G of bidirectional triode thyristor TRIAC and the voltage between main pole T1 are zero, and bidirectional triode thyristor TRIAC ends, the control winding CT of power pack CT
S3Be equivalent to open circuit.Power pack CT is flowing through elementary winding CT
PElectric current, conversion being transferred to preheating filament winding CT
S1, CT
S2, two filament F1, the F2 of fluorescent lamp LAMP are carried out preheating, the big I of preheat curent is by the formula I that provides previously
F=n1 * I
P/ 2 estimations.According to the size of filament equivalent resistance, the umber of turn N of choose reasonable power pack CT
P, N
S1And no-load voltage ratio N
P/ N
S1, control the size of preheating filament electric current well, cooperate the warm-up time of setting by the electronic ballast control drive circuit, can finish the preheating filament process before the fluorescent lamp starting very ideally.
The startup stage
After having arrived the time of end preheating, the electronic ballast control drive circuit begins to reduce the switching frequency that drives inverse switch Q1, Q2 with certain speed, with f
PHFor starting point slides to f
0Along with switching frequency approaches f gradually
0, the electric current of series resonant tank strengthens gradually, the voltage V on the resonant capacitance C2
C2Increase, work as V
C2After reaching the starting resistor of fluorescent lamp, fluorescent lamp is lighted.
The bright lamp stage
After fluorescent lamp was lighted, the fluorescent lamp electric current produced sampling voltage V by sample resistance R1
R1Operating current according to fluorescent lamp is selected suitable sample resistance R1 resistance value, makes V
R1The absolute value of the output voltage of the voltage doubling rectifing circuit of forming via voltage multiplying rectifier element D1, D2 and C3, trigger voltage greater than bidirectional triode thyristor TRIAC, trigger bidirectional triode thyristor TRIAC conducting through current-limiting resistance R2, select suitable circuits for triggering time constant, make the bright back of lamp bidirectional triode thyristor TRIAC keep two-way admittance.Behind the bidirectional triode thyristor TRIAC two-way admittance, the CT of power pack CT
S3Terminal voltage be bidirectional triode thyristor TRIAC turning-on voltage V
T, representative value is about 1.5V, by the heater current of the analysis of front this moment I by formula
F=(N
S1/ N
S3) * V
T/ Rf estimation.Lighted the resistance of filament equivalent resistance Rf afterwards, choose reasonable turn ratio N according to fluorescent lamp
S1/ N
S3, heater current I
FBe controlled at and be low to moderate almost negligible level.
Embodiment two
The embodiment that provides below shows that fully the present invention can realize with circuit arrangement flexibly.Accompanying drawing 2 is to simplify schematic diagram, and the sign of element adds suffix A and distinguishes with accompanying drawing 1 and come among the figure.Accompanying drawing 2 is the elementary winding CTA of power pack CTA with the difference of accompanying drawing 1
PLink position and to control winding CTA
S3Implement on the circuit of control, the annexation of remainder and effect and accompanying drawing 1 are basic identical, repeat no more.
Power pack CTA has an elementary winding CTA
PWith two preheating filament winding CTA
S1, CTA
S2And control winding CTA
S3, the number of turn of each winding is followed successively by NA
P, NA
S1, NA
S2And NA
S3, and NA
S1=NA
S2, NA
S3Be NA
PAnd NA
S1Several times more than.Elementary CTA
PAfter resonant capacitance C2A connects, in parallel with fluorescent lamp LAMPA branch road.Flow through elementary winding CTA in the preheating filament stage
PElectric current and accompanying drawing 1 flow through elementary winding CT
PElectric current be the same.But after lighting fluorescent lamp LAMPA, lamp current does not flow through elementary winding CTA
P, visible under the identical condition of other circuit parameter, flow through elementary winding CTA
PElementary current ratio flows through elementary winding CT
PLittle, thereby the loss of relevant components and parts is also lower.Elementary winding CTA in the reality
PPresent a little induction reactance at resonant tank, its back of connecting with resonant capacitance C2A has minimal effect to starting resistor, and this takes into account this influence when sliding frequency fire process of design electric ballast and just is easy to solution.
Control winding CTA
S3Two pins, connect the input of the rectifier bridge of forming by diode D3A, D4A, D5A, D6A, the anode of rectifier output voltage connects the collector electrode of NPN triode Q3A, negative terminal connects the emitter of NPN triode Q3A; The voltage doubling rectifing circuit of being made up of voltage multiplying rectifier element D1A, D2A and C3A is to the lamp current sampling voltage V on the sample resistance R1A
R1ABehind the voltage multiplying rectifier, be added to the base stage of NPN triode Q3A, V like this through current-limiting resistance R2A
R1AJust become the drive source of NPN triode Q3A.
Job step and previous embodiment one are basic identical.Difference is the circuit of accompanying drawing 1, be utilized bidirectional triode thyristor TRIAC by and the two states of two-way admittance, make the CT of power pack CT
S3Open circuit or by the Low ESR short circuit is realized control preheating filament electric current and is stopped the heater current process; And accompanying drawing 2 is the control winding CTA to power pack CTA of elder generation
S3Output voltage with after the rectifier bridge commutation, with NPN triode Q3A by and the saturation conduction two states, make control winding CTA
S3Open circuit or by the Low ESR short circuit is realized control preheating filament electric current and is stopped the heater current process.Two schemes compare, and the conduction loss of the saturation conduction loss ratio bidirectional triode thyristor TRIAC of NPN triode Q3A itself is lower, but has increased a rectifier bridge.Both performances, cost difference are little generally.
Claims (8)
1. the control method of preheating cathode type fluorescent lamp preheating filament before startup, it is characterized in that: one on the high magnetic permeability magnetic core coiling have the power pack of elementary winding, preheating filament winding, control winding, wherein, the inductance or the capacitances in series in the export resonance loop of elementary winding and electronic ballast for fluoresent lamp, the preheating filament winding connects Filament of fluorescent lamp; Make control winding open circuit or, make the operating state of power pack be changed and then control heater current by control circuit by the Low ESR short circuit.
2. the control method of preheating cathode type fluorescent lamp according to claim 1 preheating filament before startup, it is characterized in that: the operating state change of described power pack is meant when preheating filament, the control winding is opened a way, and power pack is transferred to the preheating filament winding to the current transformation that flows through elementary winding to filament pre-heating; After lighting fluorescent lamp, make the control winding by the Low ESR short circuit by control circuit, heater current is eased down to one and can uncared-forly be worth.
3. the control device of preheating cathode type fluorescent lamp preheating filament before startup, include power pack, it is characterized in that: be wound with two preheating filament windings and a control winding of an elementary winding, equal turn numbers on the high magnetic permeability magnetic core of power pack, elementary winding is connected with the choke induction of electronic ballast for fluoresent lamp; Two preheating windings connect two filaments of fluorescent lamp respectively through two capacitances; Two outputs of control winding connect the main end of bidirectional triode thyristor respectively; The control winding is open-circuit condition when bidirectional triode thyristor ends; When the bidirectional triode thyristor two-way admittance, the control winding is by the low on-resistance short circuit between the main end of bidirectional triode thyristor.
4. the control device of preheating cathode type fluorescent lamp as claimed in claim 3 preheating filament before startup, it is characterized in that: also include a sample resistance of connecting with fluorescent lamp, voltage doubling rectifing circuit with voltage multiplying rectifier element composition, voltage doubling rectifing circuit is to the voltage voltage multiplying rectifier on the sample resistance, rectifier output voltage is added between the gate pole and main end of bidirectional triode thyristor, as The Trigger of Bidirectional Triode Thyristor voltage through current-limiting resistance; When fluorescent tube was not lighted, the voltage multiplying rectifier output voltage was zero, and bidirectional triode thyristor ends; Behind the lamp tube starting, the absolute value of voltage multiplying rectifier output voltage is higher than the trigger voltage of bidirectional triode thyristor gate pole, the bidirectional triode thyristor two-way admittance.
5. the control device of preheating cathode type fluorescent lamp as claimed in claim 3 preheating filament before startup, it is characterized in that: before starting fluorescent lamp in the preheating filament process, heater current is directly proportional with the primary current of power pack, is directly proportional with the turn ratio of elementary umber of turn to the preheating filament umber of turn; After having lighted fluorescent lamp, heater current is directly proportional with the output end voltage of control winding, is directly proportional with the turn ratio of preheating filament umber of turn to the control umber of turn, is inversely proportional to the filament equivalent resistance.
6. the control device of preheating cathode type fluorescent lamp preheating filament before startup, include power pack, it is characterized in that: be wound with two preheating filament windings and a control winding of an elementary winding, equal turn numbers on the high magnetic permeability magnetic core of power pack, the startup capacitances in series of elementary winding and fluorescent lamp; Two secondary winding connect two filaments of fluorescent lamp respectively through capacitance; Two outputs of control winding are connected to two inputs of rectifier bridge respectively, the high-frequency ac voltage of control winding is converted to unidirectional high-frequency pulse voltage output through rectifier bridge, positive output connects the collector electrode of NPN triode, negative output sending and receiving emitter-base bandgap grading, when the NPN triode ended, the control winding was open-circuit condition; During NPN triode saturation conduction, the control winding is by the collector electrode of the forward conduction resistance of rectifier bridge series connection NPN triode, the saturation conduction resistance short circuit between the emitter.
7. the control device of preheating cathode type fluorescent lamp as claimed in claim 6 preheating filament before startup, it is characterized in that: also include a sample resistance of connecting with fluorescent lamp, the voltage doubling rectifing circuit of forming with the voltage multiplying rectifier element is to the voltage voltage multiplying rectifier on the sample resistance, rectification output is added between the base stage and emitter of NPN triode, as the driving voltage of NPN triode through current-limiting resistance; When fluorescent tube was not lighted, the voltage multiplying rectifier output voltage was zero, and the NPN triode ends; Behind the lamp tube starting, voltage multiplying rectifier output provides enough drive currents, makes the NPN triode enter the saturation conduction state.
8. the control device of preheating cathode type fluorescent lamp as claimed in claim 6 preheating filament before startup, it is characterized in that: before starting fluorescent lamp in the preheating filament process, heater current is directly proportional with the primary current of power pack, is directly proportional with the turn ratio of elementary umber of turn to the preheating filament umber of turn; After having lighted fluorescent lamp, heater current is directly proportional with the output end voltage of control winding, is directly proportional with the turn ratio of preheating filament umber of turn to the control umber of turn, is inversely proportional to the filament equivalent resistance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100242721A CN102186297B (en) | 2011-01-22 | 2011-01-22 | Control device for preheating lamp filament of preheating cathode type fluorescent lamp before starting |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100242721A CN102186297B (en) | 2011-01-22 | 2011-01-22 | Control device for preheating lamp filament of preheating cathode type fluorescent lamp before starting |
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| CN102186297A true CN102186297A (en) | 2011-09-14 |
| CN102186297B CN102186297B (en) | 2013-12-11 |
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| Application Number | Title | Priority Date | Filing Date |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2538115Y (en) * | 2002-04-19 | 2003-02-26 | 飞宏电子（上海）有限公司 | Electronic ballast |
| CN101232762A (en) * | 2008-03-03 | 2008-07-30 | 北京东方百士电子有限公司 | Low-pressure gas discharge lamp filament pre-heating control device |
| CN201976310U (en) * | 2011-01-22 | 2011-09-14 | 佛山市美博照明有限公司 | Control device for filament preheating prior to startup of cathode preheating type fluorescent lamp |
| CN201976311U (en) * | 2011-01-22 | 2011-09-14 | 佛山市美博照明有限公司 | Control device for cathode type fluorescent lamp to heat filaments before start-up |
-
2011
- 2011-01-22 CN CN2011100242721A patent/CN102186297B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2538115Y (en) * | 2002-04-19 | 2003-02-26 | 飞宏电子（上海）有限公司 | Electronic ballast |
| CN101232762A (en) * | 2008-03-03 | 2008-07-30 | 北京东方百士电子有限公司 | Low-pressure gas discharge lamp filament pre-heating control device |
| CN201976310U (en) * | 2011-01-22 | 2011-09-14 | 佛山市美博照明有限公司 | Control device for filament preheating prior to startup of cathode preheating type fluorescent lamp |
| CN201976311U (en) * | 2011-01-22 | 2011-09-14 | 佛山市美博照明有限公司 | Control device for cathode type fluorescent lamp to heat filaments before start-up |
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Effective date of registration: 20170413 Address after: Tung Chung town Nansha District Guangzhou city Guangdong province Yufeng road 510000 No. 56 Patentee after: Guangzhou bodi Photoelectric Technology Co Ltd Address before: 528244 Guangdong, Foshan, Nanhai District, Lishui Town, Riverside Village Industrial Zone, Foshan City Lighting Co., Ltd. Patentee before: Foshan Nanbo Lighting & Appliances Co., Ltd. |
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Granted publication date: 20131211 Termination date: 20210122 |