CN102378459A - Discharge lamp lighting circuit - Google Patents
Discharge lamp lighting circuit Download PDFInfo
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- CN102378459A CN102378459A CN2011102380321A CN201110238032A CN102378459A CN 102378459 A CN102378459 A CN 102378459A CN 2011102380321 A CN2011102380321 A CN 2011102380321A CN 201110238032 A CN201110238032 A CN 201110238032A CN 102378459 A CN102378459 A CN 102378459A
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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
- H05B41/38—Controlling the intensity of light
- H05B41/40—Controlling the intensity of light discontinuously
- H05B41/42—Controlling the intensity of light discontinuously in two steps only
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Abstract
A discharge lamp lighting circuit 100 supplies power to a discharge lamp 226 used as a light source of a vehicle lighting device capable of switching between a first state and a second state by light distribution change means. A light distribution pattern of the second state is different from a light distribution pattern of the first state. The power supplied to the discharge lamp 226 is changed at a timing of switching from the first state to the second state.
Description
Technical field
The present invention relates to a kind of discharge lamp lighting circuit.
Background technology
Usually, the light distribution patterns as the light that is shone by the lamps apparatus for vehicle such as headlamp from vehicle forms at vehicle front exists the go light distribution patterns of light (being also referred to as distance light) usefulness and the light distribution patterns of staggered light (being also referred to as dipped beam) usefulness.In headlamp, there is the headlamp that is called as so-called 2 lamp formula types that uses identical light source to realize these two kinds of light distribution patterns.
As the light source that here uses, replace Halogen lamp LED in recent years with filament, and discharge lamps such as use metal halide lamp.Discharge lamp is compared with Halogen lamp LED, can obtain high-luminous-efficiency, long-life, but opposite, owing to need tens～hundreds of V as driving voltage, so can't directly be driven by the on-vehicle battery of 12V or 24V, needs discharge lamp lighting circuit (being also referred to as ballast).
On the other hand, be target with the cost degradation of headlamp, advance low-powerization as the discharge lamp of light source.The for motor vehicle discharge lamp that circulates on the current market, the connection power of great majority when stablizing is about 35W (watt), but the current obtainable up-to-date connection power of lower powered discharge lamp when stablizing is about 25W for being less than or equal to 30W especially.
In patent documentation 1, disclose a kind of discharging lamp device for vehicle, it has the lamp circuit that the rayed of going of same nominal value is lit a lamp and controlled with discharge lamp with discharge lamp and staggered rayed.
Patent documentation 1: TOHKEMY 2001-080411 communique
Summary of the invention
Switch at the headlamp that utilizes 2 lamp formulas under the situation of distance light and dipped beam, for example the shading state of illuminator inside before changing mechanically.Usually becoming under the situation of dipped beam, the light that compares from discharge lamp with the situation of distance light blocks morely.Under the situation that above-mentioned lower powered discharge lamp is used as light source,, make that thus the light beam of the light that shines from this discharge lamp is also lower here, though be low-power.
Even in order to utilize lower powered discharge lamp, also can obtain the light of the necessary light beam of distance light, and consideration is corresponding with the decline of light beam, in distance light, reduces the shading amount and does not perhaps block.But, in above-mentioned countermeasure, also have limit, the current situation that is difficult to use more lower powered discharge lamp that is in.
The present invention is in view of above-mentioned condition and proposing, and its purpose is, a kind of discharge lamp lighting circuit of controlling with the corresponding power of switching of the state of lamps apparatus for vehicle realized is provided.
A kind of mode of the present invention relates to discharge lamp lighting circuit.The discharge lamp supply power that this discharge lamp lighting circuit uses to the light source as lamps apparatus for vehicle; This lamps apparatus for vehicle can utilize luminous intensity distribution change unit that the 2nd state that the 1st state and light distribution patterns are different from the 1st state is switched; And this discharge lamp lighting circuit is corresponding to the switching of the 2nd state from the 1st state with lamps apparatus for vehicle, changes the power of supplying with to discharge lamp.
According to this mode, can realize with lamps apparatus for vehicle in the state control of switching corresponding supply power.
In addition,, between device, method, system etc., replace each other and the technical scheme that obtains, also but effectively as mode of the present invention with the combination in any of above inscape, inscape of the present invention and performance.
The effect of invention
According to the present invention, can realize the power control corresponding with the switching of the state of lamps apparatus for vehicle.
Description of drawings
Fig. 1 is the in-built summary section that expression has the headlamp unit of the related discharge lamp lighting circuit of execution mode.
Fig. 2 is the circuit diagram of the structure of related discharge lamp lighting circuit of expression execution mode and connected parts.
Fig. 3 is the circuit diagram of structure of the lighting control circuit of presentation graphs 2.
Fig. 4 is the curve chart that changes the time of the example of the light beam of expression discharge lamp and the lamp power supplied with to discharge lamp.
Fig. 5 is the oscillogram of the rising waveform of the expression discharge lamp lighting circuit and the light beam that actual measurement goes out that use Fig. 2.
Fig. 6 is the circuit diagram of the structure of the related adjustment circuit of expression variation.
Fig. 7 is that expression is used the discharge lamp lighting circuit comprise the related adjustment circuit of variation and the oscillogram of the rising waveform of the light beam that actual measurement goes out.
Embodiment
Below, based on preferred embodiment, simultaneously with reference to description of drawings the present invention.For at identical shown in each accompanying drawing or the inscape, parts, the signal that are equal to, mark identical label, suitably omit the explanation of repetition.In addition, in each accompanying drawing,, omit for a part that goes up unessential parts is described.
In this manual; So-called " state that components A is connected with part B "; Except finger A and part B physically the direct-connected situation, also comprise the situation that components A and part B are connected via other parts that state of being electrically connected do not exerted an influence indirectly.Identical ground; So-called " between components A and part B, being provided with the state of parts C "; Except finger A and parts C or part B with the direct-connected situation of parts C, also comprise situation about connecting indirectly via other parts that state of being electrically connected do not exerted an influence.
Fig. 1 is the in-built summary section that expression has the headlamp unit 210 of the related discharge lamp lighting circuit of this execution mode 100.Headlamp unit 210 is the lamps apparatus for vehicle that carry in vehicle.Fig. 1 representes to comprise from the utilization of light fixture left sides the section of the headlamp unit 210 that the vertical plane of lamp optical axis X cuts off.Headlamp unit 210 is to use identical light source to realize in the headlamp of 2 lamp formulas of high-beam condition and dipped beam state.
Speculum 228 will reflect from the light that discharge lamp 226 penetrates.And for from the light of discharge lamp 226 and by the light of speculum 228 reflections, its part is through constituting rotary shutter 222 of chopping mechanism 224, by to projecting lens 232 guiding.
Be back to Fig. 1.
At the internal face of lamp house 216, for example the lower position of lamp unit 218 disposes the light fixture control part 220 of the formation control of light a lamp light-off control and the light distribution patterns of carrying out lamp unit 218.Light fixture control part 220 comprises related discharge lamp lighting circuit of execution mode 100 (afterwards stating) and luminous intensity distribution state switching circuit (not shown).
The luminous intensity distribution state switching circuit is corresponding with the Hi/Lo switching signal from the outside, and the state of headlamp unit 210 is switched between high-beam condition and dipped beam state.Under the high-beam condition of headlamp unit 210, the light that the past backlight unit 210 irradiates forms distance light and uses light distribution patterns.Under the dipped beam state of headlamp unit 210, the light that the past backlight unit 210 irradiates forms dipped beam and uses light distribution patterns.
More particularly, the luminous intensity distribution state switching circuit is under the situation of Hi/Lo switching signal effective (being high level), and the motor of control chopping mechanism 224 is used light distribution patterns to form distance light.The luminous intensity distribution state switching circuit is under the situation of Hi/Lo switching signal invalid (being low level), and the motor of control chopping mechanism 224 is used light distribution patterns to form dipped beam.
In addition, in this execution mode, through headlamp unit 210 inner mechanical actions high-beam condition and dipped beam state are switched, but also can be utilized other luminous intensity distribution change unit that high-beam condition and dipped beam state are switched.For example, if the electric signal of applying then also can use the lens of variations in refractive index to come switching state, also can use MEMS (Micro Electro Mechanical Systems) speculum to come switching state.
Fig. 2 is the circuit diagram of the structure of related discharge lamp lighting circuit 100 of expression execution mode and connected parts.Discharge lamp 226 supply powers that discharge lamp lighting circuit 100 uses to the light source as headlamp unit 210.Discharge lamp lighting circuit 100 is connected with on-vehicle battery (being designated hereinafter simply as battery) 6, mains switch 8.
Battery 6 produces cell voltage (supply voltage) Vbat of the direct current of 12V (perhaps 24V).Mains switch 8 is the relay switches that are provided with for the closure of lighting a lamp, the disconnection of discharge lamp 226 are controlled, the setting of connecting with battery 6.If mains switch 8 closures are then supplied with cell voltage Vbat from battery 6 to discharge lamp lighting circuit 100.
Discharge lamp lighting circuit 100 boosts the cell voltage Vbat after the smoothing, carries out supplying with to discharge lamp 226 behind the exchange conversion.Discharge lamp lighting circuit 100 has DC/DC converter CONV, lighting control circuit 10, start-up circuit 20, inverter circuit 30, input capacitor Cin and current sense resistor Rd.
Input capacitor Cin and battery 6 parallelly connected settings are with cell voltage Vbat smoothing.More particularly, input capacitor Cin be arranged on input transformer 14 near, realize the function of the voltage smoothing corresponding with the switch motion of DC/DC converter CONV.
DC/DC converter CONV boosts cell voltage Vbat.DC/DC converter CONV is the switching regulaor of insulated type, comprises input transformer 14, output diode D1, output capacitor Co and the 1st switch element M1.
1 winding L 1 of input transformer 14 and the 1st switch element M1, Cin is parallelly connected with input capacitor, and in series is arranged between the input terminal Pin and earth terminal (GND) of DC/DC converter CONV.For example, the 1st switch element M1 is made up of N-channel MOS FET (Metal Oxide Semiconductor Field Effect Transistor).One end ground connection of 2 winding L 2 of input transformer 14, its other end is connected with the positive pole of output diode D1.Output capacitor Co is arranged between the negative pole and earth terminal of output diode D1.
The control terminal of the 1st switch element M1 (grid) is connected with the 1st terminals P 1 of lighting control circuit 10.Apply the control wave S1 of driving frequency f1 to the control terminal of the 1st switch element M1.For example, under the stable state of lighting a lamp, driving frequency f1 is 400kHz.The 1st switch element M1 is closed when control wave S1 is high level, when low level, breaks off.
The output voltage V o of the direct current after inverter circuit 30 will boost through DC/DC converter CONV is transformed to the alternating voltage of the frequency f 2 of lighting a lamp and supplies with to discharge lamp 226.As inverter circuit 30, for example use known inverter circuits such as H bridge circuit.
The frequency f of lighting a lamp 2 is set lowlyer than driving frequency f1.The frequency f of lighting a lamp 2 is set at and is less than or equal to 10kHz, and is preferably set to 250Hz～750Hz degree, in this execution mode, is set at 312.5Hz.With the inverse of the frequency f 2 of lighting a lamp be called the cycle T 2 of lighting a lamp (=1/f2=3.2ms).
Current sense resistor Rd is arranged on the path of the lamp current IL that discharge lamp 226 flows.In the circuit of Fig. 2, current sense resistor Rd is arranged on DC/DC converter CONV and the ground connection distribution that inverter circuit 30 is connected.On current sense resistor Rd, produce the voltage drop Vd that is directly proportional with lamp current IL.
Start-up circuit 20 is provided with for disruptive discharge lamp 226.Start-up circuit 20 comprises starting transformer 22 and pulse-generating circuit 28.Pulse-generating circuit 28 applies the pulse voltage that amplitude is 400V～1kV to 1 winding 24 of starting transformer 22.Its result produces the high voltage pulse (for example 20kV) corresponding with the ratio of winding of starting transformer 22 2 winding 26 sides, and applies to discharge lamp 226.Its result punctures discharge lamp 226, begins discharge.
In addition, lighting control circuit 10 constitutes, and makes under high-beam condition to equate to the maximum in the design of the power that discharge lamp 226 is supplied with in the maximum in the design of the power that discharge lamp 226 is supplied with under the dipped beam state.Maximum in the design of the power that discharge lamp 226 is supplied with is the fiducial value to the power of discharge lamp 226 supplies.In other example, as this fiducial value, also can use the mean value or the maximum of power, also can use expression to the modulating voltage of the power of discharge lamp 226 supplies or the fiducial value of lamp current in addition.
In addition; During till power connection to stable lighting a lamp; To the power that discharge lamp 226 is supplied with become maximum during, after discharge lamp 226 has just been lit a lamp during, promptly discharge lamp lighting circuit 100 begins the transition period of the regulation behind discharge lamp 226 supply powers.Because lighting control circuit 10 constitutes; Maximum in the design of power under high-beam condition and the dipped beam state equates; Even so, substantially can not change the power of supplying with to discharge lamp 226 at the state of above-mentioned transition period intra headlamp unit 210 yet.
Fig. 3 is the circuit diagram of the structure of expression lighting control circuit 10.Lighting control circuit 10 also comprises and is used to make discharge lamp lighting circuit 100 acting other parts except comprising parts shown in Figure 3, but in order to make explanation clear, in Fig. 3, omits these parts.
State detection circuit 102 detects the electric state of discharge lamp 226.State detection circuit 102 is connected with the 3rd terminals P 3, keeps watch on output voltage V o.State detection circuit 102 is connected with the 4th terminals P 4 and the 5th terminals P 5, measures the voltage drop Vd that in current sense resistor Rd, produces, and lamp current IL is carried out computing.State detection circuit 102 is via adjustment circuit 106, and to the counter-rotating input terminal input power signal S3 of error amplifier 110, this power signal S3 has and the corresponding voltage of supplying with to discharge lamp 226 of power.
Error amplifier 110 amplifies with the voltage of power signal S3 with by the error between the reference voltage V ref of reference voltage source 108 generations, generates the error signal S4 with voltage corresponding with the error that is exaggerated.The value of reference voltage V ref is based on desired destination power and sets.Error amplifier 110 is with the non-counter-rotating input terminal input of error signal S4 to PWM comparator 114.
Sawtooth waveforms generative circuit 112 generates the periodic signal S5 of the periodic voltage that triangle is wavy or sawtooth is wavy with driving frequency f1, and imports to the counter-rotating input terminal of PWM comparator 114.
PWM comparator 114 is through comparing the voltage of error signal S4 and the voltage of periodic signal S5, thereby generates control wave S1.PWM comparator 114 is supplied with control wave S1 to the 1st terminals P 1.
Timing circuit 104 is connected with the 3rd terminals P 3, and output voltage V o or the voltage corresponding with it are applied to an end of time capacitor 116.The other end ground connection of time capacitor 116.
If mains switch 8 closures to discharge lamp lighting circuit 100 energized, then so far are essentially zero output voltage V o rising.Like this, time capacitor 116 charges through timing circuit 104, till the charging voltage that arrives regulation.If mains switch 8 is broken off for being full of under the electric state at time capacitor 116, then output voltage V o descends at once, becomes zero in fact.Timing circuit 104 has the resistance of the time constant of the discharge that determines time capacitor 116, and time capacitor 116 discharges according to this time constant.Here, the time constant of discharge is predetermined, confirms the resistance value of the resistance of timing circuit 104, to realize above-mentioned definite time constant.Thus, can measure from stopping to begin the elapsed time of process according to the voltage (voltage) that mains switch 8 is broken off and stops an end of the time capacitor 116 behind discharge lamp 226 supply powers to discharge lamp 226 supply powers.
Timing circuit 104 is in order to differentiate the for example heating/cooling of discharge lamp 226, and generate the signal corresponding with a terminal voltage of time capacitor 116 perhaps according to this voltage derivation with corresponding signal of elapsed time.
Especially, timing circuit 104 generates the TC signal S6 with voltage corresponding with a terminal voltage of time capacitor 116, and supplies with to adjustment circuit 106.In addition, adjustment circuit 106 is not to use TC signal S6 for according to adjusting from the elapsed time that stops to begin to discharge lamp 226 supply powers process, but utilizes the variation of the TC signal S6 after discharge lamp lighting circuit 100 energized.That is, adjustment circuit 106 increases and use TC signal S6 the power of supplying with to discharge lamp 226 in during transition.
State detection circuit 102 control line design according to the rules generates lamp current signal S7, the 1st lamp voltage signal S8 and the 2nd lamp voltage signal S9, and to 106 inputs of adjustment circuit.Lamp current signal S7 has the voltage corresponding with lamp current IL, the signal of the voltage that for example is directly proportional with lamp current IL.The 1st lamp voltage signal S8 and the 2nd lamp voltage signal S9 all are that having with the voltage of discharge lamp 226 is the signal of the corresponding voltage of modulating voltage, and be in the 1st lamp voltage signal S8 and the 2nd lamp voltage signal S9, different to the dependence mode of modulating voltage.
Adjustment circuit 106 synthesizes lamp current signal S7, the 1st lamp voltage signal S8, the 2nd lamp voltage signal S9, generates power signal S3.Adjustment circuit 106 is connected with the 2nd terminals P 2, and based on Hi/Lo switching signal S2, the overlapping of each signal when synthesizing switched.Adjustment circuit 106 comprises commutation circuit the 118, the 1st resistance commutation circuit the 120, the 2nd resistance commutation circuit the 122, the 1st resistance the 124, the 2nd resistance the 126, the 3rd resistance 128.
To the end input lamp current signal S7 of the 2nd resistance 126, the other end is connected with the counter-rotating input terminal of error amplifier 110.
To the end input TC of the 1st resistance 124 signal S6, the other end is connected with the counter-rotating input terminal of error amplifier 110.
The 3rd resistance 128 is variable resistors, and the one of which end is connected other end ground connection with the counter-rotating input terminal of error amplifier 110.
The 1st resistance commutation circuit 120 is arranged between the counter-rotating input terminal of terminal and error amplifier 110 of output the 1st lamp voltage signal S8 of state detection circuit 102, and constituting can be based on the 1st switching signal S10 convert resistance value.The 1st resistance commutation circuit 120 has the 4th switch element the 144, the 8th resistance 146 and the 9th resistance 148.Import the 1st lamp voltage signal S8 to an end of the 8th resistance 146, the other end is connected with an end of the 9th resistance 148.Connected node place between an end of the other end of the 8th resistance 146 and the 9th resistance 148 is connected with the drain electrode as the 4th switch element 144 of N-channel MOS FET.Import the 1st switching signal S10 to the grid of the 4th switch element 144.The other end of the source electrode of the 4th switch element 144 and the 9th resistance 148 all is connected with the counter-rotating input terminal of error amplifier 110.
The 2nd resistance commutation circuit 122 is arranged between the counter-rotating input terminal of terminal and error amplifier 110 of output the 2nd lamp voltage signal S9 of state detection circuit 102, and constituting can be based on the 2nd switching signal S11 convert resistance value.The 2nd resistance commutation circuit 122 has the 5th switch element the 150, the 10th resistance 152 and the 11st resistance 154.One end of the 10th resistance 152 is connected with an end of the 11st resistance 154, imports the 2nd lamp voltage signal S9 to its connected node.The other end of the 10th resistance 152 is connected with drain electrode as the 5th switch element 150 of N-channel MOS FET.Import the 2nd switching signal S11 to the grid of the 5th switch element 150.The other end of the source electrode of the 5th switch element 150 and the 11st resistance 154 all is connected with the counter-rotating input terminal of error amplifier 110.
If in Hi/Lo switching signal S2, rising edge occurs, then commutation circuit 118 resistance value that the 1st resistance commutation circuit 120 and the 2nd resistance commutation circuit 122 resistance value are separately used from the dipped beam state switches to the resistance value that high-beam condition is used.Commutation circuit 118 has the 1st capacitor the 130, the 4th resistance the 132, the 2nd switch element the 134, the 5th resistance the 136, the 6th resistance the 138, the 7th resistance 140 and the 3rd switch element 142.
One end of one end of the 4th resistance 132 and the 1st capacitor 130 all is connected with the 2nd terminals P 2.The other end ground connection of the 1st capacitor 130.The other end of the 4th resistance 132 is connected with base stage as the 2nd switch element 134 of npn type bipolar transistor.The grounded emitter of the 2nd switch element 134.The collector electrode of the 2nd switch element 134 is connected with an end of the 5th resistance 136 and an end of the 6th resistance 138.The voltage of the collector electrode of the 2nd switch element 134 is supplied with to the grid of the 4th switch element 144 as the 1st switching signal S 10.The other end to the 5th resistance 136 applies the fixed power source voltage vcc.The other end of the 6th resistance 138 is connected with base stage as the 3rd switch element 142 of npn type bipolar transistor.The grounded emitter of the 3rd switch element 142.The collector electrode of the 3rd switch element 142 is connected with an end of the 7th resistance 140.The other end to the 7th resistance 140 applies the fixed power source voltage vcc.The voltage of the collector electrode of the 3rd switch element 142 is supplied with to the grid of the 5th switch element 150 as the 2nd switching signal S11.
At Hi/Lo switching signal S2 is under the situation of high level, and the 1st switching signal S10 becomes low level, and the 2nd switching signal S11 becomes high level.Therefore; The 4th switch element 144 breaks off; The 5th switch element 150 closures; The resistance value of the 1st resistance commutation circuit 120 becomes the series connection combined resistance value of the 8th resistance 146 and the 9th resistance 148, and the resistance value of the 2nd resistance commutation circuit 122 becomes the parallelly connected combined resistance value of the 10th resistance 152 and the 11st resistance 154.
At Hi/Lo switching signal S2 is under the low level situation, and the 1st switching signal S10 becomes high level, and the 2nd switching signal S11 becomes low level.Therefore, the 4th switch element 144 closures, the 5th switch element 150 breaks off, and the resistance value of the 1st resistance commutation circuit 120 becomes the resistance value of the 8th resistance 146, and the resistance value of the 2nd resistance commutation circuit 122 becomes the resistance value of the 11st resistance 154.
Each circuit constant of adjustment circuit 106 is to confirm according to following design philosophy.
(1) discharge lamp lighting circuit 100 switches to the state of headlamp unit 210 under the situation of high-beam condition when stable lighting a lamp from the dipped beam state, must make the control of the power increase of supplying with to discharge lamp 226.More particularly, must carry out the control to the 35W increase from 25W.
(2) discharge lamp lighting circuit 100 is no matter under high-beam condition or under the dipped beam state, and it is identical all must to make the maximum of transition period connect power.More particularly, identical ground under two states must be made as about 60W to the maximum in the design of the power that discharge lamp 226 is supplied with.
(3), must realize that also stable power controls, promptly carries out smoothly the power switching even during transition the back is stable when lighting a lamp that certain regularly switches the state of headlamp unit 210 for discharge lamp lighting circuit 100.
Be used for confirming the design procedure of each circuit constant, be described below.
(A) calculate and to be used to realize that the power corresponding with high-beam condition controls (the control line constant of the power of the maximum of power/when stablizing=60W/35W).Calculating is used to realize the power control corresponding with the dipped beam state (the control line constant of the power of the maximum of power/when stablizing=60W/25W).
2 kinds of constants that (B) will calculate compare, and when switching 2 kinds of control lines, so that must carry out the least possible mode of resistance quantity that resistance value is switched, adjust each resistance value.Especially, in the circuit of the form of adjusting circuit 106, if the ratio of each resistance value is identical, then characteristic is also identical.In addition, 1st resistance 124 of adjustment in the circuit 106 is staples of the power supplied with to discharge lamp 226 in determining during transition.Therefore, consider above-mentioned (2), the resistance value of the 1st resistance 124 is made as the fixed value that does not rely on Hi/Lo switching signal S2.Then, to high-beam condition and dipped beam state, the resistance value with the 1st fixing resistance 124 is a basic point respectively, confirms the 1st resistance commutation circuit the 120, the 2nd resistance commutation circuit the 122, the 2nd resistance the 126, the 3rd resistance 128 resistance value separately.At this moment, confirm resistance value,, under the dipped beam state, supply with the power of 25W to discharge lamp 226 so that supply with the power of 35W under the high-beam condition when stable lighting a lamp to discharge lamp 226.In addition, in this execution mode, between the two states of headlamp unit 210, realize commonization of resistance value of commonization and the 3rd resistance 128 of the resistance value of the 2nd resistance 126.
The resistance value of the resistance value of the 1st resistance commutation circuit of (C) confirming to high-beam condition 120 and the 1st resistance commutation circuit 120 confirmed to the dipped beam state, corresponding with the conversion of Hi/Lo switching signal S2 and utilize switch element to switch.Also identical for the 2nd resistance commutation circuit 122.
It more than is the structure of discharge lamp lighting circuit 100.Describe in the face of its action down.Fig. 4 is the curve chart that changes the time of the example of the light beam LF of expression discharge lamp 226 and the lamp power WL that supplies with to discharge lamp 226.In Fig. 4, the longitudinal axis is represented the size of light beam LF and lamp power WL, transverse axis express time.In Fig. 4, the state of headlamp unit 210 is corresponding with the situation that it is fixed on a certain side.
If mains switch 8 closures when moment t0 are then utilized the high-voltage pulse that is generated by start-up circuit 20, discharge lamp 226 is punctured, discharge lamp 226 is lit a lamp.Then, in the transition period TP1 till light beam LF is stable, in order to realize the rising of light beam as early as possible, and during discharge lamp 226 is supplied with than stable lighting a lamp the big lamp power WL of TP2.Especially, during transition among the TP1, lamp power WL reaches the maximum WM in the design of the power that discharge lamp 226 is supplied with, and reaches 60W here.
The TP2, lamp power WL becomes the value corresponding with the state of headlamp unit 210 during stable the lighting a lamp of the light of exporting stable light beam LF from discharge lamp 226.Especially, if headlamp unit 210 is a high-beam condition, then lamp power WL is 35W, if be the dipped beam state, then lamp power WL is 25W.
The discharge lamp lighting circuit 100 that this execution mode is related, to discharge lamp 226 supply powers that the light source as headlamp unit 210 uses, this headlamp unit 210 has the luminous intensity distribution change unit that 2 kinds of different states of light distribution patterns are switched.The switching of the state in this discharge lamp lighting circuit 100 and the headlamp unit 210 is corresponding, changes the power of supplying with to discharge lamp 226.Therefore, the kind expanded range of switchable light distribution patterns.For example, can realize only to utilize headlamp unit 210 luminous intensity distributions own to change the variation of light distribution patterns greatly that unit are realized.
Especially, the discharge lamp lighting circuit 100 that this execution mode is related, corresponding to the switching of high-beam condition from the dipped beam state with headlamp unit 210 increases the power of supplying with to discharge lamp 226.Therefore,, also can under high-beam condition, supply with the light beam of sufficient quantity, can satisfy the specification that requires of high-beam condition even use the discharge lamp 226 of low-power low beam more.
In addition, the related discharge lamp lighting circuit 100 of this execution mode constitutes, and the maximum in the design of the power that discharge lamp 226 is supplied with equates under high-beam condition and dipped beam state.Therefore, reach among the peaked transition period TP1 in the design at the power of supplying with to discharge lamp 226, the power of supplying with to discharge lamp 226 under high-beam condition and dipped beam state about equally.Therefore, confirm the maximum in the common design of this two states through life-span, durability and the necessary light beam rising characteristic of considering discharge lamp 226, thus can reduce because of the state switching cause to the discharge lamp influence in 226 life-spans.
In addition, the discharge lamp lighting circuit 100 that this execution mode is related under the dipped beam state, is supplied with the power of the 25W littler than 30W to discharge lamp 226 when stable lighting a lamp.It is about 35W that the common automobile of current productionization uses discharge lamp when stablizing, to connect power.Under the situation of lighting a lamp,, also can satisfy the specification that requires of high-beam condition even the power of supplying with is constant with 35W.Here; In that the luminous efficiency of current automobile with discharge lamp is made as under the situation about 100lm/W, under high-beam condition, need the light beam about 3000lm, therefore; If the power of supplying with to discharge lamp 226 is less than or equal to 30W, then can't satisfy the specification that requires of high-beam condition probably.Therefore; In the related discharge lamp lighting circuit 100 of this execution mode; Owing to the corresponding power of being supplied with that increases of the switching of high-beam condition, so, also can satisfy the specification that requires of high-beam condition even when stablizing, connect the discharge lamp that power is less than or equal to 30W.
Fig. 5 is the oscillogram that the rising waveform of the light beam that discharge lamp lighting circuit 100 actual measurements go out is used in expression.The transverse axis express time of Fig. 5, the longitudinal axis is represented light beam.Used low power discharge lamp as discharge lamp 226.The rising waveform of the light beam when waveform 302 expression is fixed as high-beam condition with the state of headlamp unit 210.Waveform 304 is illustrated in the rising waveform that rigidly connects the light beam under the situation about high-beam condition and dipped beam state being switched cycle of 1 second after logical from power supply.The rising waveform of the light beam when waveform 306 is illustrated in state with headlamp unit 210 and is fixed as the dipped beam state.At moment t1 with mains switch 8 closures.
According to Fig. 5, if the switching during transition through state, with the power variation transformation beam about 5W, the change about then visible 100lm.During stable lighting a lamp, shown in design philosophy, can confirm that the switching of 25W/35W is stable and carry out smoothly.
More than, the structure and the action of the related discharge lamp lighting circuit 100 of execution mode is illustrated.This execution mode is an example, and the combination for its each inscape and each are handled can have various variation, in addition, above-mentioned variation also within the scope of the invention, this point can be understood by those skilled in the art.
As stated, in the related discharge lamp lighting circuit 100 of execution mode, if the state of intra headlamp unit 210 during transition, the power variation about then visible several W.Below, the related adjustment circuit 156 of variation of having implemented to be used to suppress the countermeasure of this change is described.
The adjustment circuit 156 that variation is related shields Hi/Lo switching signal S2 in during transition.Therefore, during transition in, can be not corresponding, and change the power of supplying with to discharge lamp 226 with the switching of the state of headlamp unit 210.
In addition, the adjustment circuit 156 that variation is related through the voltage of TC signal S6 and the threshold voltage of regulation are compared, thereby is differentiated during being in transition period or being in stable lighting a lamp.The voltage of TC signal S6 rises from the beginning of lighting a lamp of discharge lamp 226 gradually.Adjustment circuit 156 is judged as transition period under the low situation of the voltage ratio threshold voltage of this TC signal S6, during high situation judges to stable lighting a lamp.
In the case, the voltage of the time capacitor 116 through will being used to measure the elapsed time after the light-off also utilizes in during transition the differentiation, thereby also can not be designed for circuit and the element that transition period is differentiated in addition.
Fig. 6 is the circuit diagram of the structure of the related adjustment circuit 156 of expression variation.The related adjustment circuit 156 of variation has the structure of in the related adjustment circuit 106 of execution mode, appending screened circuit 162 and forming.
Collector electrode as the 6th switch element 164 of npn type bipolar transistor is connected with the base stage of the 2nd switch element 134.The grounded emitter of the 6th switch element 164.The base stage of the 6th switch element 164 is connected with collector electrode as the 8th switch element 174 of pnp type bipolar transistor.One end of one end of the 12nd resistance 166 and the 13rd resistance 168 is connected with the other end of the 7th resistance 140.The other end of the 13rd resistance 168 is connected with an end of the 14th resistance 170, and its connected node is connected with base stage as the 7th switch element 172 of pnp type bipolar transistor.The other end ground connection of the 14th resistance 170.The other end of the 12nd resistance 166 is connected with the emitter of the 7th switch element 172 and the emitter of the 8th switch element 174.The grounded collector of the 7th switch element 172.To the end input TC of the 15th resistance 176 signal S6, the other end is connected with the base stage of the 8th switch element 174.
In commutation circuit shown in Figure 6 160 and screened circuit 162, under the voltage ratio of the TC signal S6 situation low by the definite threshold voltage of the resistance value of the 13rd resistance 168 and the 14th resistance 170, the 6th switch element 164 closures.Its result, the base stage of the 2nd switch element 134 does not rely on Hi/Lo switching signal S2, is fixed as low level.And,, then carry out switching controls based on above-mentioned Hi/Lo switching signal S2 if the voltage of TC signal S6 rises and surpasses threshold voltage.
In addition, threshold voltage also can be confirmed through experiment.
Fig. 7 is that expression is used the discharge lamp lighting circuit comprise the related adjustment circuit 156 of variation and the oscillogram of the rising waveform of the light beam that actual measurement goes out.The transverse axis express time of Fig. 7, the longitudinal axis is represented light beam.Used low power discharge lamp as discharge lamp 226.The condition determination of waveform 308, waveform 310, waveform 312 is corresponding with the condition determination of the waveform 302 of Fig. 5, waveform 304, waveform 306 respectively.At moment t2 with mains switch 8 closures.
According to this variation, as shown in Figure 7, can suppress the light beam change of accompanying with the state switching of headlamp unit 210 in the transition period.In addition, identical ground with execution mode, during stable lighting a lamp, shown in design philosophy, the switching of 25W/35W is stablized and is carried out smoothly.
Perhaps; In order to keep above-mentioned function of shielding; Simultaneously circuit is further simplified; And the 1st resistance commutation circuit 120 and the 2nd resistance commutation circuit 122 are replaced into a resistance respectively, and also can replace, be provided with the 3rd resistance 128 parallelly connectedly and can utilize Hi/Lo switching signal S2 to carry out the resistance that closure/disconnection is switched.Screened circuit should closure/disconnection in also can be during transition the switching shielding.
In execution mode, the situation of utilizing alternating voltage that discharge lamp 226 is driven has been described, but has been not limited to this, in the discharge lamp lighting circuit that utilizes direct voltage that discharge lamp 226 is driven, also can be suitable for the related technological thought of execution mode.In the case, also can use the structure behind the removal inverter circuit 30 from execution mode.In addition, the related technological thought of execution mode also goes in the discharge lamp lighting circuit of so-called pair of converter type.
In execution mode, explained and used the situation of the DC/DC converter of insulated type, but be not limited to this, also can use the DC/DC converter of nonisulated type.
In execution mode, discharge lamp 226 and discharge lamp lighting circuit 100 are illustrated as consubstantiality not, but are not limited to this, also can discharge lamp be assembled in the discharge lamp lighting circuit.
In execution mode, the situation of discharge lamp lighting circuit 100 to discharge lamp 226 supply powers has been described, but has been not limited to this.The related technological thought of this execution mode also goes in the lamp circuit of LED semiconductor light source supply powers such as (Light Emitting Diode).
Claims (5)
1. discharge lamp lighting circuit, it is to the discharge lamp supply power that uses as the light source of lamps apparatus for vehicle, and this lamps apparatus for vehicle can utilize luminous intensity distribution change unit that the 2nd state that the 1st state and light distribution patterns are different from said the 1st state is switched,
It is characterized in that,
Corresponding to the switching of said the 2nd state from said the 1st state with said lamps apparatus for vehicle changes the power of supplying with to said discharge lamp.
2. discharge lamp lighting circuit according to claim 1 is characterized in that,
Constitute the fiducial value of the power of supplying with to said discharge lamp, equal down at said the 1st state and said the 2nd state of said lamps apparatus for vehicle.
3. discharge lamp lighting circuit according to claim 1 and 2 is characterized in that,
In the specified time limit that begins behind said discharge lamp supply power, corresponding and change the power of supplying with to said discharge lamp to the switching of said the 2nd state with said lamps apparatus for vehicle not from said the 1st state.
4. discharge lamp lighting circuit according to claim 3 is characterized in that,
Said discharge lamp lighting circuit has time capacitor, and its control that is used to measure from being used to stop to said discharge lamp supply power begins institute's elapsed time,
Be based on the voltage of said time capacitor during the said regulation and definite.
5. discharge lamp lighting circuit according to claim 1 and 2 is characterized in that,
Said discharge lamp lighting circuit is corresponding to the switching of said the 2nd state from said the 1st state with said lamps apparatus for vehicle, and the power of supplying with to said discharge lamp is increased,
Said discharge lamp lighting circuit when stable the lighting a lamp of the light of exporting stable light beam from said discharge lamp, is supplied with the power less than 30 watts to said discharge lamp under said the 1st state of said lamps apparatus for vehicle.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010184633A JP5551545B2 (en) | 2010-08-20 | 2010-08-20 | Discharge lamp lighting circuit |
| JP2010-184633 | 2010-08-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102378459A true CN102378459A (en) | 2012-03-14 |
| CN102378459B CN102378459B (en) | 2014-04-09 |
Family
ID=44508926
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110238032.1A Expired - Fee Related CN102378459B (en) | 2010-08-20 | 2011-08-18 | Discharge lamp lighting circuit |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2420407A1 (en) |
| JP (1) | JP5551545B2 (en) |
| CN (1) | CN102378459B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113170555A (en) * | 2018-09-24 | 2021-07-23 | 法雷奥照明公司 | Detector device and automobile lighting device |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6101587B2 (en) * | 2013-07-18 | 2017-03-22 | 株式会社小糸製作所 | Vehicle headlamp |
| JP6259649B2 (en) * | 2013-12-06 | 2018-01-10 | 株式会社小糸製作所 | Vehicle lighting |
| JP2018085222A (en) * | 2016-11-24 | 2018-05-31 | 東芝ライテック株式会社 | Discharge lamp, vehicle lamp, and lighting fixture for vehicle |
| JP2018092829A (en) * | 2016-12-06 | 2018-06-14 | 東芝ライテック株式会社 | Discharge lamp, vehicle illumination device, and vehicle lamp fitting |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4020878A1 (en) * | 1989-07-03 | 1991-01-17 | Koito Mfg Co Ltd | Headlamp control circuit for vehicle - has separate lamps for dipped beam and full beam and with progressive changeover in beam settings |
| CN1287931A (en) * | 1999-09-10 | 2001-03-21 | 株式会社小糸制作所 | Discharging lamp device for vehicle |
| CN1312669A (en) * | 2000-01-20 | 2001-09-12 | 株式会社小糸制作所 | Lighting circuit of discharging lamp |
| US6417624B1 (en) * | 1999-08-30 | 2002-07-09 | Koito Manufacturing Co., Ltd. | Lighting system for vehicle |
| US20040195980A1 (en) * | 2003-04-07 | 2004-10-07 | Mitsubishi Denki Kabushiki Daisha | Discharge lamp starter |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4208251B2 (en) * | 1997-06-06 | 2009-01-14 | ハリソン東芝ライティング株式会社 | Metal halide discharge lamp, metal halide discharge lamp lighting device and lighting device |
| JP3898462B2 (en) * | 2001-05-14 | 2007-03-28 | 株式会社小糸製作所 | Vehicle headlamp |
| JP4333391B2 (en) * | 2004-02-09 | 2009-09-16 | 市光工業株式会社 | Light distribution control system |
| JP2006216251A (en) * | 2005-02-01 | 2006-08-17 | Koito Mfg Co Ltd | Vehicle head lamp device |
| JP4927453B2 (en) * | 2005-08-01 | 2012-05-09 | フェニックス電機株式会社 | High pressure discharge lamp lighting circuit |
| JP4667321B2 (en) * | 2005-10-06 | 2011-04-13 | 株式会社小糸製作所 | Vehicle lamp |
| WO2009104115A1 (en) * | 2008-02-20 | 2009-08-27 | Philips Intellectual Property & Standards Gmbh | Automotive front lighting system with adaptive arc shaping |
| JP5469312B2 (en) * | 2008-04-24 | 2014-04-16 | パナソニック株式会社 | Light distribution variable discharge lamp lighting device, vehicle headlamp |
-
2010
- 2010-08-20 JP JP2010184633A patent/JP5551545B2/en not_active Expired - Fee Related
-
2011
- 2011-08-12 EP EP11177472A patent/EP2420407A1/en not_active Withdrawn
- 2011-08-18 CN CN201110238032.1A patent/CN102378459B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4020878A1 (en) * | 1989-07-03 | 1991-01-17 | Koito Mfg Co Ltd | Headlamp control circuit for vehicle - has separate lamps for dipped beam and full beam and with progressive changeover in beam settings |
| US6417624B1 (en) * | 1999-08-30 | 2002-07-09 | Koito Manufacturing Co., Ltd. | Lighting system for vehicle |
| CN1287931A (en) * | 1999-09-10 | 2001-03-21 | 株式会社小糸制作所 | Discharging lamp device for vehicle |
| CN1312669A (en) * | 2000-01-20 | 2001-09-12 | 株式会社小糸制作所 | Lighting circuit of discharging lamp |
| US20040195980A1 (en) * | 2003-04-07 | 2004-10-07 | Mitsubishi Denki Kabushiki Daisha | Discharge lamp starter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113170555A (en) * | 2018-09-24 | 2021-07-23 | 法雷奥照明公司 | Detector device and automobile lighting device |
| CN113170555B (en) * | 2018-09-24 | 2024-05-31 | 法雷奥照明公司 | Detector device and automobile lighting device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2012040967A (en) | 2012-03-01 |
| JP5551545B2 (en) | 2014-07-16 |
| EP2420407A1 (en) | 2012-02-22 |
| CN102378459B (en) | 2014-04-09 |
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