CN1287932A - Discharging lamp device for vehicle - Google Patents
Discharging lamp device for vehicle Download PDFInfo
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- CN1287932A CN1287932A CN 00127045 CN00127045A CN1287932A CN 1287932 A CN1287932 A CN 1287932A CN 00127045 CN00127045 CN 00127045 CN 00127045 A CN00127045 A CN 00127045A CN 1287932 A CN1287932 A CN 1287932A
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Abstract
In the normal condition that a traveling beam irradiation discharge lamp and a low beam irradiation discharge lamp are lighted, power supply is controlled so that a total of the supplying power value to each discharge lamp (P1+P2) is smaller than a total of the rated power values of each discharge lamp (P1R+P2R). For example, the supplying power value to one discharge lamp (P1) is set at a value less than the rated power value thereof, or the supplying power value to both the discharge lamps (P1, P2) are set at values less than the rated power values thereof (P1R, P2R).
Description
The present invention relates to a kind of technology that makes discharging lamp device for vehicle miniaturization and cost-cutting, the aforementioned vehicle discharge lamp deivce that is constituted is to adopt the common point circuit for lamp to the control of lighting a lamp of several discharge lamps.
Using discharge lamp (metal halide lamp) when using light source, knowing that its lamp circuit is to be made of DC power supply circuit, direct current one AC transform circuit, starting circuit (so-called start circuit) as vehicle.
Yet, discharge lamp is used under the situation of light source as vehicle, generally need be to the control of lighting a lamp of several discharge lamps, if this moment is to each discharge lamp attachment point circuit for lamp all, just there is the problem on cost and the configuration space, therefore manage to carry out circuit layout, so that can adopt the common point circuit for lamp that several discharge lamps are lit a lamp.
For example, when using discharge lamp as the automotive headlamp light source, when adopting respectively (so-called four lamp formulas are thrown light on) when travelling the structure of light beam (so-called distance light) and intersection car light beam (so-called dipped beam) with independent discharge lamp irradiation, each two discharge lamp about needing, and two pairs of such discharge lamps need lamp circuit separately.In addition, for the control of lighting a lamp of each discharge lamp, be after becoming the state of normally (lighting a lamp) from the initial stage of lighting a lamp, carry out permanent power control, make and supply with power-handling capability to this discharge lamp
But, in device in the past, under the normal condition that the light beam irradiates of travelling is lit a lamp with the discharge lamp both with discharge lamp and intersection car light beam irradiates, make the magnitude of power of supplying with to each discharge lamp reach their specified magnitude of power simultaneously owing to control, so the load of lamp circuit is a problem.
Promptly, because the magnitude of power sum of supplying with to discharge lamp is very big, then the power consumption according to the lamp circuit efficiency calculation increases, therefore the problem that produces is the heating and the probability of failure increase of circuit component, reliability requirement as if the withstand voltage of considering the device that comprises circuit and electric current permissible value etc., and use expensive device, will cause cost rising and the increase of circuit volume etc.
Here, the objective of the invention is, for the discharging lamp device for vehicle that the light beam irradiates of travelling is lit a lamp with discharge lamp with discharge lamp and intersection car light beam irradiates, the implement device miniaturization also can cost-cutting.
The present invention is in order to address the above problem, for the discharging lamp device for vehicle that possesses the lamp circuit of can be simultaneously the light beam irradiates of travelling being lit a lamp with these two kinds of discharge lamps of discharge lamp with discharge lamp and intersection car light beam irradiates, when the normal condition of two discharge lamp lightings, carry out power supply control, make and supply with the power-handling capability sum of the magnitude of power sum of each discharge lamp less than each discharge lamp.
Therefore, according to the present invention, because supply power value sum is less than the power-handling capability sum of each discharge lamp when the state of normally lighting a lamp of each discharge lamp, then for the device of the formation of the lamp circuit as installing in the past, with regard to do not need to use high withstand voltage etc. device.
Fig. 1 is for the diagram of curves of discharging lamp device for vehicle fundamental operation of the present invention is described.
Diagram of curves shown in Figure 2 is to be illustrated in to carry out power control in the normal district and make the supply power of exporting to a discharge lamp export to the situation of the supply power of another discharge lamp less than its power-handling capability greater than its rating horsepower.
Diagram of curves shown in Figure 3 is to be illustrated in to carry out the feasible situation of the supply power of a discharge lamp less than its power-handling capability of exporting to of power control in the transition region.
Diagram of curves shown in Figure 4 is to be illustrated in to carry out power control in the transition region and make for the stagger situation of maximum power input time of each discharge lamp.
To be expression reduce to export to the situation of the supply power of another discharge lamp gradually from the moment that the state of lighting a lamp of a discharge lamp enters normal district to diagram of curves shown in Figure 5.
Fig. 6 is the block scheme of its lamp circuit configuration example of expression discharging lamp device for vehicle of the present invention.
Fig. 7 is the pie graph of its main portion of control circuit of 1 discharge lamp of expression.
Fig. 8 is the pie graph of the 1st its main portion of circuit form of expression control circuit of the present invention.
Fig. 9 is the pie graph of the 2nd its main portion of circuit form of expression control circuit of the present invention.
Figure 10 is the configuration example that the maximum access power of expression limits its output of circuit.
Figure 11 is the instruction diagram about the state measurement circuit configuration example of lighting a lamp.
Figure 12 is the pie graph that is illustrated in its main portion of control circuit in the 2nd circuit form of control circuit of the present invention, and its carries out power control according to the measurement signal of the state measurement circuit of lighting a lamp to discharge lamp.
Figure 13 and Figure 14 are the examples of the basiccircuit of expression power adjusting circuit, and Figure 13 has represented to use the configuration example of analog switch.
Figure 14 is the configuration example that two current mirroring circuits have been used in expression.
1 expression discharging lamp device for vehicle, 6_1,6_2 represent discharge lamp.
Before the formation to discharging lamp device for vehicle of the present invention describes, the power control of discharge lamp is described according to Fig. 1 to Fig. 5.
Transverse axis is as time " t " among Fig. 1, and the longitudinal axis is as the power of supplying with to discharge lamp " P ", and Fig. 1 is this power time history plot of casehistory.And, curve P1, the P2 shown in the figure be represent to supply with respectively two discharge lamps magnitude of power over time, the curve shown in " P1+P2 " be supply with each discharge lamp the power sum over time.Again, " P1R ", " P2R " that on the P axle, shows for the straight line parallel (with reference to the dotted line among the figure), the value of " P1R+P2R " with time shaft, wherein " P1R " represents its power-handling capability of discharge lamp shown in the straight line P1, its power-handling capability of discharge lamp shown in " P2R " expression straight line P2, both sums are represented by " P1R+P2R ".
In the example shown in Figure 1, when t=0, give after two discharge lamp lightings simultaneously, in their light a lamp the initial stage (hereinafter referred to as " transition region "), supply with the power of overrate, to impel discharge lamp luminous, make light increase sharply usually, after carrying out such control, enter normal condition or the state of normally lighting a lamp (hereinafter referred to as normal district) and carry out the control of permanent power.
Then, in the normal district of two discharge lamp lightings, control, make the sum (P1+P2) of the magnitude of power supplied with to each discharge lamp less than the power-handling capability sum (P1R+P2R) of each discharge lamp.Therefore, alleviated the load of lamp circuit, according to little than in the past of the power consumption of the efficiency calculation of lamp circuit, so just do not need the useful life longevity can demanding, expensive device.
In addition, in Fig. 1,, be set at " P1R ≠ P2R " for the ease of understanding, when " P1R=P2R (=PR) " time, then carry out power control and make the power sum of in normal condition, supplying with " P1+P2 " less than " 2PR ".(for Fig. 2 shown below explanation to Fig. 5, this point too.)
Again, set up, can exemplify the certain methods shown in following for the relation that makes " (P1+P2)＜(P1R+P2R) ".
Method (ⅰ) is only a discharge lamp to be supplied with the power littler than its power-handling capability.
Method (ⅱ) is supplied with the power littler than their power-handling capability to two sides' discharge lamp.
Method (ⅲ) is that a discharge lamp is supplied with the power bigger than its power-handling capability, and another discharge lamp is supplied with the power littler than its power-handling capability.
At first, for method (ⅰ), when normal condition, the power that control is supplied with to a discharge lamp for example makes that P1 is " P1=P1R ", controls for another discharge lamp, makes " P2＜P2R ".
For method (ⅱ), when normal condition, control feasible " P1＜P1R ", " P2＜P2R " again.
For method (ⅲ), when normal condition, for example control for a discharge lamp, make " P1＞P1R ", control for another discharge lamp.Make " P2＜P2R ".Determine each magnitude of power then, make the above-mentioned relation of relevant supply power value sum set up.
Figure 2 shows that this situation, with transverse axis as time " t ", the longitudinal axis as the power of supplying with to discharge lamp " P ", and casehistory supply power value " P1 ", " P2 " over time.
As we know from the figure, the relation of " P1＞P1R ", " P2＜P2R " is set up in the normal district.
When being used for vehicle lamp, " P1 " is the magnitude of power that expression is supplied with discharge lamp to the light beam irradiates of travelling, and " P2 " is the magnitude of power that expression is supplied with discharge lamp to intersection car light beam irradiates.Promptly, when the light beam irradiates of travelling is used discharge lamp lighting with discharge lamp and intersection car light beam irradiates, wish to carry out power supply control, make magnitude of power from discharge lamp to the light beam irradiates of travelling that supply with power-handling capability, and the magnitude of power of supplying with discharge lamp to intersection car light beam irradiates is less than the power-handling capability of this discharge lamp greater than this discharge lamp.This reason is, when two discharge lamp lightings, the luminous intensity distribution that the light beam that travels is used is main, therefore by reducing the power of supplying with discharge lamp to intersection car light beam irradiates, make its power-handling capability less than it, just less by reducing total electric power value like this to the influence of whole luminous intensity distribution.
Again, among Fig. 1 and Fig. 2, in the transition region that began from discharge lamp lighting before entering normal district, the power of supplying with each discharge lamp is above they rating horsepowers, but if also control in transition region, make the power supplied with to a discharge lamp less than its power-handling capability, then at discharge lamp in the transition period that normal district is stable before lighting a lamp, the load that also can alleviate lamp circuit.
Shown in Figure 3ly be this situation, as time " t ", the longitudinal axis is as the power of supplying with to discharge lamp " P " with transverse axis, and casehistory supply power value " P1 ", " P2 " over time.
In this example, after t=0 plays each supply power value increase constantly,, but control supply power value " P2 " gradually near the magnitude of power of each discharge lamp under normal condition, can not surpass " P2R " even make in normal district yet.
When being used for vehicle lamp, some forms shown in following are arranged,
A) " P1 " is the power that expression is supplied with discharge lamp to the light beam irradiates of travelling, and " P2 " is the magnitude of power that expression is supplied with discharge lamp to intersection car light beam irradiates.
B) " P1 " is the magnitude of power that expression is supplied with discharge lamp to intersection car light beam irradiates, and " P2 " is the power that expression is supplied with discharge lamp to the light beam irradiates of travelling.
The two is compared, from shortening travel light beam irradiates with the cranking time of discharge lamp and as mentioned above the main portion of luminous intensity distribution be to rely on light a lamp this two of light beam irradiates that travel with discharge lamp, preferably above-mentioned situation a), but no matter be which kind of situation, when simultaneously the light beam irradiates of travelling being lit a lamp with discharge lamp with discharge lamp and intersection car light beam irradiates, or carry out power supply control and make the magnitude of power supplied with to one of them discharge lamp less than the power-handling capability of this discharge lamp, then can obtain to suppress effects such as transition region circuit component heating.
In addition, if the transition region behind discharge lamp lighting, the magnitude of power that does not adopt minimizing to supply with, but the time of the control of staggering in time to a discharge lamp, feasible time to peak from maximum power value to each discharge lamp that supply with is not at synchronization, and is effective so too.
Shown in Figure 4ly be this situation, as time " t ", the longitudinal axis is as the power of supplying with to discharge lamp " P " with transverse axis, and casehistory supply power value " P1 ", " P2 " over time.
In this example, the magnitude of power that " P1 " expression is supplied with discharge lamp to the light beam irradiates of travelling, the power that " P2 " expression is supplied with discharge lamp to intersection car light beam irradiates.And the moment shown in " t=t1 " is the moment that " P1 " becomes maxim " P1m ", and the moment shown in " t=t2 (＞t1) " is that " P2 " is the moment of maxim " P2m ".
As figure shows, the magnitude of power of supplying with to discharge lamp " P1 " after the moment increase of t=0, reaches maximum power value P1m above P1R in the moment of t=t1, just reduce then, value during gradually near normal condition, and the magnitude of power of supplying with to another discharge lamp " P2 " are after the moment increase of t=0, at the t=t2 that only postpones Δ t than P1 peak value moment t1 constantly, reach the maximum power value P2m that surmounts P2R, and then reduce, the value during gradually near normal condition.
Like this, when simultaneously the light beam irradiates of travelling being lit a lamp with discharge lamp with discharge lamp and intersection car light beam irradiates, if control for the magnitude of power of supplying with each discharge lamp, make that reaching their peaked moment staggers in time, promptly, control and make, so just can alleviate the load of transition region lamp circuit effectively behind a discharge lamp horsepower input, postponing slightly again to another discharge lamp horsepower input.
In addition, in Fig. 3 and Fig. 4, carry out power control in normal district and make " P1＞P1R ", " P2＜P2R " set up (with reference to said method (ⅲ)), but can certainly adopt method (ⅰ) and method (ⅱ).
In the above-mentioned explanation, to two discharge lamps simultaneously or the situation of almost lighting a lamp simultaneously be illustrated, below according to Fig. 5 under the state of a discharge lamp lighting, the control situation that another discharge lamp is lit a lamp describes.
Among Fig. 5 with transverse axis as time " t ", the longitudinal axis is as the power of supplying with to discharge lamp " P ", shown in the figure be supply power value " P1 ", " P2 " over time.
In this example, the magnitude of power that the magnitude of power that " P1 " expression is supplied with discharge lamp to the light beam irradiates of travelling, " P2 " expression are supplied with discharge lamp to intersection car light beam irradiates.
As seen from the figure, at t=0 constantly, intersection car light beam irradiates is lit a lamp with discharge lamp, under this state the light beam irradiates of travelling is lit a lamp with discharge lamp.At this moment, preferably after lighting a lamp, become the moment (entering the moment in normal district) of normal condition with discharge lamp from the light beam irradiates of travelling, reduce gradually to the magnitude of power " P2 " of intersection car light beam irradiates, and carry out power supply control feasible " P2 " power-handling capability " P2R " less than it with the discharge lamp supply.This be because, if the power of supplying with discharge lamp to intersection car light beam irradiates reduces constantly at once from t=0, then reach with discharge lamp in the process of lighting a lamp before in stable condition in the light beam irradiates of travelling, probably can not guarantee enough illumination light quantities, perhaps make the people's car on the road obviously feel light quantity variation of intersection car light beam etc., these problems can occur.
Below, formation of the present invention is described.
Fig. 6 represents the example that circuit of the present invention constitutes, it possess can be to the light beam irradiates of travelling with discharge lamp and intersection car light beam irradiates with light a lamp the simultaneously lamp circuit of control of discharge lamp.
The lamp circuit that constitutes discharging lamp device for vehicle 1 possesses power supply 2 (storage battery etc.), DC power supply circuit 3, dc-ac conversion circuit 4, starting circuit 5 (5_1,5_2).
DC power supply circuit 3 for example is made of two DC-DC (DC-to-DC) changer 3A, 3B, and they are shared between two discharge lamp 6_1,6_2.And the input of DC power supply circuit 3 is DC input voitages (using " Vin " expression here) of power supply 2 output, and exports desired vdc, according to the control signal of following control circuit output, controls and changes this output voltage.In this DC power supply circuit 3, employing has the DC-DC changer (chopped mode, reaction type etc.) of switching regulaor structure, will be configured to relation parallel with one another for the 1st circuit part (DC-DC changer 3A) that obtains straight polarity output voltage (positive output voltage) and for the 2nd circuit part (DC-DC changer 3B) that obtains negative polarity output voltage (negative output voltage).
DC-AC translation circuit 4 is the back levels that are configured in DC power supply circuit 3, it is to be used for the voltage transitions of DC power supply circuit 3 outputs is become alternating-current voltage/AC voltage supplied to discharge lamp afterwards that described translation circuit 4 is set, and straight polarity that each mouth of DC power supply circuit 3 is exported respectively and reverse voltage are sent by described translation circuit 4.This circuit 4 possesses the bridge-type circuit structure by 4 on-off element sw1, sw2, sw3, sw4 (thyristor such as field effect transister used herein, but just represent with switch symbols in the drawings) formation.
Promptly, in four on-off elements, for the 1st group of on-off element sw1, sw2 that mutual series connection forms, the end of its sw1 is connected with the mouth of DC-DC changer 3A, and the other end of this on-off element sw1 is to be connected with the mouth of DC-DC changer 3B by on-off element sw2.Then, the 1st discharge lamp 6_1 is connected with two on-off elements point of connection α each other by starting circuit 5_1 (inductive load).
Again, for the 2nd group of on-off element sw3, sw4 that mutual series connection forms, the end of its sw3 is connected with the mouth of DC-DC changer 3A, and the other end of this on-off element sw3 is to be connected with the mouth of DC-DC changer 3B by on-off element sw4.Then, the 2nd discharge lamp 6_2 is connected with two on-off elements point of connection β each other by starting circuit 5_2 (inductive load).
In the back level of DC-AC translation circuit 4, with in the 1st and the 2nd discharge lamp terminals separately not with above-mentioned point of connection α and the direct ground connection of the β bonded assembly other end or by current measurement means (the current measurement usefulness resistance " Ri1 " shown in the figure, " Ri2 ") ground connection.
Driving circuit DRV1, DRV2 have used semibridge system to drive the IC of usefulness, and one of them driving circuit DRV1 is responsible for conducting/disconnection control of switch sw1, sw2, and another driving circuit DRV1 is responsible for conducting/disconnection control of switch sw3, sw4.That is,, make that on-off element sw1 is a conducting state if carve the state of stipulating each element according to driving circuit DRV1 at a time, sw2 is an off-state, then stipulate the state of each element at this moment according to driving circuit DRV2, make that on-off element sw3 is an off-state, on-off element sw4 is a conducting state.Again, if stipulate the state of each element constantly according to driving circuit DRV1 at other, make that on-off element sw1 is an off-state, switch sw2 is a conducting state, then stipulate the state of each element this moment according to driving circuit DRV2, make that on-off element sw3 is a conducting state, on-off element sw4 is an off-state.Like this, on-off element sw1, sw4 become identical state, and on-off element sw2, sw3 become identical state, and they are to carry out alternating movement on the contrary.
Therefore, according to the conducting/disconnection action of two groups of on-off elements, for example, when the 1st discharge lamp 6_1 output cathode voltage, to the 2nd discharge lamp 6_2 output negative pole voltage, otherwise when the 1st discharge lamp 6_1 output negative pole voltage, to the 2nd discharge lamp 6_2 output cathode voltage.
And, for the lamp circuit of a discharge lamp (promptly, the circuit of Fig. 6 is during as the circuit of for example only the 1st discharge lamp 6_1 being lit a lamp), as long as utilize on-off element sw1, sw2 and driving circuit DRV1 to constitute dc-ac conversion circuit, also can remove relevant part with the 2nd discharge lamp 6-2.
Again, above-mentioned starting circuit 5_1,5_2 make circuit shared but be preferably between two discharge lamp 6_1, the 6_2, the device number and the cost-cutting that can reduce like this as independently circuit is additional in addition.
About the method for measurement of discharge lamp 6_1,6_2 voltage and electric current, following certain methods can be arranged.
Method (a) is to measure the light tube electric voltage and the lamp current of discharge lamp in the back level of DC-AC translation circuit.
Method (b) is the light tube electric voltage and the cooresponding corresponding signal of lamp current of measurement and discharge lamp.
At first, for method (a), adducible method has, and for example connects current measurement resistance (Ri1, Ri2) for above-mentioned discharge lamp, and the current conversion that will flow through becomes voltage to measure.
Again, for method (b), adducible method has, for example, and as shown in Figure 6, configuration voltages current measurement part 7 between DC power supply circuit 3 and DC-AC translation circuit 4, the measuring voltage that the output voltage of DC power supply circuit 3 is obtained with electric resistance partial pressure as with the corresponding signal of light tube electric voltage, carry out voltage measurement like this, or in order to measure the outgoing current of DC power supply circuit 3, current measurement is configured on the power lead with resistance, carries out voltage transformation again and obtain to measure electric current.
This control circuit 8 has comprised Fig. 1 to various power controls illustrated in fig. 5, and it possesses following function basically.
Determine controllable function in normal district supply power value sum.
Fix on the controllable function of the magnitude of power of supplying with in the transition region.
The peak value of each discharge lamp supply power value controllable function constantly in the transition region that staggers in time.
Before these controllable function were described, at first the situation of carrying out power control with a discharge lamp illustrated that its circuit constitutes and action as an example.
Fig. 7 is the control circuit main composition part of expression PWM (pulse duration modulation) mode, provide the reference voltage " Eref " symbolic representation of potential source (among the figure with) of regulation to the in-phase input end of revising amplifier 10, inverting input then with following shown in circuit be connected.(numeral in the bracket is the corresponding circuit of expression).
Discharge lamp alive tension measuring circuit (11)
Flow through the current measurement circuit (12) of discharge lamp electric current
Maximum access power is determined circuit (13)
Normal power is adjusted circuit (14).
Wherein, tension measuring circuit 11 and current measurement circuit 12 are the parts that receive the signal of above-mentioned voltage and current measurement part 7 outputs, discharge lamp are carried out voltage measurement and current measurement.
Maximum access power determine circuit 13 be for true 0 fixed with discharge lamp under the situation (so-called cold start) that cold conditions is lit a lamp etc. transition region the circuit of the maxim (or upper limit permissible value) of supply power.Again, to adjust circuit 14 be the supply power value to be finely tuned necessary circuit when carrying out permanent power control in the normal district to normal power.
And for this formation, the output voltage of revising amplifier 10 is big, and the power of supplying with to discharge lamp also increases (to be revised the output voltage that amplifier 10 is adjusted DC power supply circuit 3, make the negative terminal input press and equate with reference voltage Eref.), (circuit part that is to use PWM control to constitute with IC etc., it does not generate the impulse singla of change in duty cycle to the output voltage of revising amplifier 10 according to the comparative result of input voltage level and sawtooth wave through there being graphic PWM control part.) and driving circuit etc., be transformed to control signal to on-off element (semiconductor element) in the DC power supply circuit 3.
Again, represented that to the arrow shown in the A4 each several part revises the result that amplifier 10 received currents exert an influence for flowing to A1 respectively among the figure, the direction of arrow is that the direction with the each several part control current is a benchmark.For example, determine circuit 13 (reference arrow A4) for tension measuring circuit 11 (reference arrow A1) and maximum access power, their control current direction is the direction that flows out from correction amplifier 10, and therefore the current value that flows out to this direction is big more, and then the power of supplying with to discharge lamp is big more.In contrast, for current measurement circuit 12 (reference arrow A2), its control current direction is to flow into the direction of revising amplifier 10, and therefore the current value that flows out to this direction is big more, and then the power of supplying with to discharge lamp is more little.In addition, to adjust the control current of circuit 14 be that A3 with two arrows represents to normal power.No matter whichaway can both carry out the power adjustment, and when revising direction that amplifier 10 flows out and adjust, the supply power in normal district increases that (otherwise when flowing into the direction of revising amplifier 10 and adjust, the supply power in normal district reduces.)。
In transition region,, determine the power that discharge lamp is supplied with according to the state of lighting a lamp of this discharge lamp according to the influence of tension measuring circuit 11, current measurement circuit 12 and 13 pairs of control current of maximum access power qualification circuit.For example, when the added voltage of discharge lamp is low, (and point to arrow that maximum access power determines circuit 13 as can be known to the big power of discharge lamp input from tension measuring circuit 11, this maximum power value be reference measure voltage and determine), again, the electric current that flows through discharge lamp is big, and the power of supplying with to discharge lamp will reduce.
For discharge lamp permanent power control in normal district, if establish light tube electric voltage is " V ", lamp current is " I ", power-handling capability is " W ", then to control the relational expression of feasible " VI=W " as everyone knows or wait establishment (for more approximate according to the approximate relational expression " V+I=W " that obtains of straight line, as long as adopt complicated tension measuring circuit and current measurement circuit to constitute, adopt many broken lines that permanent horsepower curve is similar to, but must consider along with the increase of device number produce.)。
Like this, can not consider that maximum access power is determined the control current that circuit 13 produces in normal district, therefore control the control current sum that makes tension measuring circuit 11, current measurement circuit 13 and normal power adjust circuit 14 and be zero ampere (promptly, input voltage and reference voltage at this state correction amplifier 10 are consistent, and when inconsistent, for example, when input voltage is low, the output voltage of amplifier increases, then supply power increases, otherwise when high, the output voltage of amplifier descends as input voltage, and then supply power reduces.)。
Below, control circuit formation of the present invention is described, can have following circuit form this moment.
(I) utilized the output of 1 correction amplifier to control and exported to the light beam irradiates of travelling is used the supply power sum of discharge lamp with discharge lamp and intersection car light beam irradiates form.
(II) according to the output of the correction amplifier (two amplifiers) of the power control of each discharge lamp, the light beam irradiates of travelling is used the supply power of discharge lamp with discharge lamp and intersection car light beam irradiates form is exported in control respectively.
Fig. 8 is the formation example of circuit form shown in the expression (I), and is as described below with the difference of formation shown in Figure 7.
Utilize the tension measuring circuit 11N that measures two discharge lamp voltage value sums, replaced above-mentioned tension measuring circuit 11.
Utilize the current measurement circuit 12N that measures the current value sum that flows through two discharge lamps, replaced above-mentioned current measurement circuit 12.
When two discharge lamp lightings, the power control that utilizes maximum access power to determine that circuit 13N and normal power adjustment member 14N carry out is that the magnitude of power sum of exporting to two discharge lamps is controlled.
Travelling according to expression, (comprise the indicator signal and represent signal that this discharge lamp has been lit a lamp etc. of lighting a lamp of this discharge lamp here, below note is made " SH " to light beam irradiates with the signal of discharge lamp lighting.) and expression intersection car light beam irradiates with the signal of the discharge lamp lighting (indicator signal and represent signal that this discharge lamp has been lit a lamp etc. of lighting a lamp that comprises this discharge lamp here, below note is made " SL ") adjust the power adjusting circuit 15 of magnitude of power sum, be arranged on and revise amplifier 10 inverting inputs.
And the arrow A represented among the figure 1 to A4 is used for representing the control current with Fig. 7 each several part related circuit respectively, and new arrow A 5 is that (direction of arrow is to be benchmark to point to the direction of revising amplifier 10 for the control current that is used for representing power adjusting circuit 15.)
Voltage measurement of carrying out and current measurement are the observed reading sums for two discharge lamps in this case.That is, the observed reading of voltage sum hour, the control current of direction shown in the arrow A 1 become big, and again, when the observed reading of electric current sum was big, it is big that the control current of direction shown in the arrow A 2 becomes.
When two discharge lamps at normal class mark lamp the time, power adjusting circuit 15 can received signal SH and signal SL, can know to export to that lighting a lamp of two discharge lamps indicated or two discharge lamps are lit a lamp.Therefore, this moment is as long as control by increasing the control current shown in the arrow A 5, makes the supply power value sum of exporting to discharge lamp get final product less than their power-handling capability sum.Promptly, if the rating horsepower of two discharge lamps is under 35 watts the situation simultaneously, control make normally supply power value sum for example be that (at this moment, setting each the control current value sum shown in arrow A 1, A2, A3, the A5 is zero ampere about 60 watts for less than 35 * 2=70 watt value.)。
In addition, when having only one to light a lamp among two discharge lamps of same rating horsepower, compare during with two discharge lamp lightings, measuring voltage is about half with the value of measuring electric current, therefore circuit is adjusted the above-mentioned signal SH of circuit 15 acceptance or some signals of SL, as long as adjust the control current shown in the arrow A 5, make that the supply power in normal district gets final product for its rating horsepower.The power-handling capability of promptly establishing this discharge lamp is under 35 watts the situation, and (at this moment, setting each the control current value sum shown in arrow A 1, A2, A3, the A5 is zero ampere for this value to control the supply power value that makes in normal district.)。
In this example, be to be provided with power adjusting circuit 15 in addition, when this circuit receives signal SH or SL, for these signals, control by the magnitude of power of predesignating, but also can adopt such formation, be about to signal SH and SL and export to normal power adjustment circuit 14, control (at this moment by the same power that can carry out like this carrying out with power adjusting circuit 15, under the state with desirable magnitude of power supplied to discharge lamp in normal district, setting each the control current value sum that makes shown in arrow A 1, A2, the A3 is zero ampere.)。
So, the advantage of the circuit form shown in (I) is, can carry out power control to two discharge lamps by shared 1 error amplifier, but another face, for tension measuring circuit 11N and current measurement circuit 12, must carry out the measurement of voltage sum and electric current sum.
Fig. 9 is the morphotic example of circuit shown in (II), and for the formation that each discharge lamp had shown in Figure 7, secondary power is adjusted circuit 16 respectively.And, the power control circuit main portion of light beam irradiates of only having represented in the drawings to travel with discharge lamp or one of them discharge lamp of intersection car light beam irradiates usefulness discharge lamp.For example, if the circuit shown in the figure is to travel light beam irradiates during with the circuit of discharge lamp, power adjusting circuit 16 is accepted the input of above-mentioned signal SL, changes the control current of revising the input of amplifier negative terminal again, and carries out the power control of this discharge lamp according to this output signal of revising amplifier.Again, when if the circuit shown in the figure is the circuit of intersection car light beam irradiates usefulness discharge lamp, power adjusting circuit 16 is accepted the input of above-mentioned signal SH, changes the control current of revising the input of amplifier negative terminal again, and carries out the power control of this discharge lamp according to this output signal of revising amplifier.
Therefore in addition, the measurement of the voltage of discharge lamp and electric current is carried out respectively each discharge lamp in this case, is the same with tension measuring circuit 11 and current measurement circuit 12 shown in Figure 7.
So, this circuit is under the situation of the light beam irradiates of travelling being carried out power control with discharge lamp, according to signal SL to power adjusting circuit 16 inputs, when known intersection car light beam irradiates with discharge lamp lighting or light a lamp and indicate now, by increasing the control current of direction shown in the arrow A 5, can make and export to the light beam irradiates of travelling and diminish with the discharge lamp supply power, its result is to make and export to the supply power value sum of each discharge lamp less than these power-handling capability sums.For example, if establishing the light beam irradiates of travelling is 35 watt-hours with the power-handling capability of discharge lamp, supply power value in normal district is the value less than 35 watts, for example, control and make to be that (at this moment, setting each the control current value sum that makes shown in arrow A 1, A2, A3, the A5 is zero ampere about 30 watts.)。
Similarly, this circuit is under the situation of intersection car light beam irradiates being carried out power control with discharge lamp, according to signal SH to power adjusting circuit 16 inputs, when the known light beam irradiates of travelling with discharge lamp lighting or light a lamp and indicate now, by increasing the control current of direction shown in the arrow A 5, can make and export to intersection car light beam irradiates and diminish with the supply power of discharge lamp, its result is to make and export to the supply power value sum of each discharge lamp less than these power-handling capability sums.
The advantage of the circuit form of (II) is like this, can control the supply power of exporting to each discharge lamp respectively, but conversely, each discharge lamp all needs control circuit.
And, reach (ⅱ) for said method (ⅰ), because exporting to the supply power of discharge lamp in will normally distinguishing controls to reducing direction, as long as therefore utilize power adjusting circuit (15,16) to carry out above-mentioned control, yet according to method (ⅲ), when setting the supply power of a discharge lamp in normal district greater than its power-handling capability when big, the flow direction of control current is opposite with direction shown in Fig. 9 arrow A 5, reduce the supply power of another discharge lamp simultaneously, increase part to offset this power, the permanent power control of so normally distinguishing.In addition, when the light beam irradiates of travelling was lit a lamp with discharge lamp simultaneously with discharge lamp and intersection car light beam irradiates, more valued was the light beam irradiates discharge lamp that travels, and then controlled to make this discharge lamp want big at the supply power in normal district greater than its rating horsepower.
In order to determine the supply power value of transition region, utilize maximum access power to determine the control current of circuit (13,13N) and control the supply power of exporting to discharge lamp again.That is, as long as by making the control current flow direction can limit access power when lighting a lamp the initial stage in the opposite direction for side shown in the arrow A 4 among Fig. 8 and Fig. 9.
Below, the control method that the peak value when being maxim for the supply power that will export to discharge lamp deliberately staggers constantly describes.
Be located at when making the light beam irradiates of travelling, will postpone a little a bit with the time of discharge lamp supply power, then can suppress the heating of electronic circuit in this case, can adopt following method this to intersection car light beam irradiates with the discharge lamp lighting supply power.
Method (1) is the light a lamp state of monitoring travel light beam irradiates with discharge lamp, when the state of this discharge lamp enters when lighting a lamp state normally, makes to intersection car light beam irradiates discharge lamp Maximum Power Output, by the time of the supply power that staggers like this.
Method (2) is that limiting the maximum access power sum of exporting to two discharge lamps in the transition region was a certain value after lighting a lamp of each discharge lamp began.
More above-mentioned two methods, if consider that two discharge lamps become the time that normal condition needs overlength before simultaneously in the method (1), then wish using method (2), for example need only above-mentioned maximum access power determined that the control current sum of circuit 13 and 13N is limited to below the set upper limit value this moment.
The maximum access power that is above-mentioned (II) circuit form shown in Figure 10 is determined the example that circuit constitutes, and has provided the output stage of this circuit.
It (is the control signal for definite maximum access power value that signal among the figure " VSH " and " VSL " expression is carried out the signal that calculation process obtains according to the voltage measurement signal of each discharge lamp and the temporal information of lighting a lamp (beginning elapsed time from lighting a lamp), produce signal as restriction discharge lamp electric current, make for example when the voltage of transition region discharge lamp hangs down, then access power increases, along with the rising of discharge lamp voltage, then access power will reduce.), signal " VSH " expression is travelled light beam irradiates with the signal of discharge lamp, and signal " VSL " expression intersection car light beam irradiates is with the signal of discharge lamp.
Signal VSH at first imports the voltage buffer 17 that adopts op amp.Promptly supply with signal VSN to the in-phase input end of op amp 18, inverting input is connected with the mouth of op amp 18.
The mouth of voltage buffer 17 (is the circuit that has with the equal characteristic of ideal behavior of diode by resistance 19 and ideal diode 20, be actually and use diode and op amp to constitute, but a negative electrode symbolic representation with diode on figure) connects, and the anode of this diode is connected with the inverting input that figure goes up the correction amplifier (light beam irradiates is controlled relevant with the power of discharge lamp with travelling) that does not have expression.That is, flow by the direction shown in this figure upward arrow AH4 for the control current that limits transition region power.
For the path of signal VSL, also identical with signal VSH situation, supply with signal VSL to the in-phase input end of the op amp 22 that constitutes voltage buffer 21, inverting input links to each other with the mouth of op amp 22.Like this, the mouth of this op amp 22 by resistance 23 and with the negative electrode of desirable diode 24 (with reference to the point of connection b that links to each other with resistance 23.) link to each other, the anode of this diode is connected with the inverting input that figure goes up the correction amplifier (relevant with the power control of discharge lamp with intersection car light beam irradiates) that does not have expression.That is, flow by the direction shown in this figure upward arrow AL4 for the control current that limits transition region power.
If like this, then just determine according to the resistance value of resistance 19,23 respectively at the maximum access power of exporting each discharge lamp to transition region, therefore in formation as shown in the figure, signal VSH exerts an influence by the output stage of 25 pairs of voltage buffers 21 of differential inverting amplifier.
That is, op amp 26 its inverting inputs that constitute differential inverting amplifier 25 link to each other with signal VSH by resistance 27, supply with the reference voltage " Er " symbolic representation of usefulness source of stable pressure (among the figure be) of regulation to the in-phase input end of this op amp 26.Like this, the mouth of op amp 26 then links to each other with the point of connection b of resistance 23 with above-mentioned desirable diode 24 by resistance 28.And resistance 29 is feedback resistances that the mouth with op amp 26 links to each other with inverting input, and again, the voltage of the measurement point (with reference to the point of a shown in the figure) that picks out from the mouth of op amp 26 is delivered to the following state measurement circuit of lighting a lamp.
In this circuit, are low or height than reference voltage Er according to the current potential of the in-phase input end of op amp 26, the size of the control current shown in the arrow A L4 then can change, and controls in view of the above and exports to the supply power of intersection car light beam irradiates with discharge lamp.For example, shown in arrow B among the figure, electric current is under the situation of the output stage (point of connection b) of differential sign-changing amplifier 25 inflow voltage buffers 21, because the control current shown in the arrow A L14 diminishes or vanishing, then control makes that exporting to intersection car light beam irradiates diminishes with the supply power of discharge lamp.
And, the resistance value by setting 3 resistance 27 to 29 and the ratio of resistance value, can adjusting control electric current sum, perhaps, can adjust this delay time etc. comparing when the moment of light beam irradiates with discharge lamp access maximum power of travelling will postpone with the moment that discharge lamp inserts maximum power to intersection car light beam irradiates.
Below, the above-mentioned circuit of controlling usefulness illustrated in fig. 5 is constituted, describe to Figure 13 according to Figure 11.
Figure 11 is the basic comprising figure that the state measurement circuit 30 of lighting a lamp of discharge lamp lighting state is measured in expression.
Circuit is to constitute like this, import the measurement signal (this note is made " SV ") of relevant discharge lamp lighting state at the in-phase input end of comparator 31, at the reference voltage " Vr " (using the symbolic representation of source of stable pressure among the figure) of inverting input input regulation, both comparative results are as " H " (high level) or such 2 value signals (this note is made " the SC ") output of " L " (low level).
This circuit is to measure the circuit whether discharge lamp lights a lamp in normal district, and its method of measurement for example can have the certain methods shown in following.
Method (1) is to judge according to the voltage measurement signal of discharge lamp.
Method (2) is to determine that according to maximum access power the control current (electric current shown in the arrow A 4) of circuit judges.
At first, in the method (1), notice the high more this point of voltage, when the observed reading of this voltage has exceeded predefined threshold values (Vr is corresponding with said reference voltage) near the normal condition discharge lamp, be judged as and enter normal district, this result's of output expression signal H.Therefore, Ci Shi measurement signal SV is the voltage measurement signal of discharge lamp.
Again, in the method (2), notice that when discharge lamp is normally lit a lamp state maximum access power determines the control current of the circuit this point that do not flow, when this controls electric observed reading less than predefined threshold values (Vr is corresponding with said reference voltage), be judged as and enter the normal district of stream, this result's of output expression signal (signal L).For example, measure its current potential of measurement point (that is, measurement signal SV is the voltage measurement signal that a is ordered) of representing with a point among Figure 10, by it and reference voltage V r (=Er) compare, whether the state that can measure discharge lamp enters normal district from transition region.For example, under measuring voltage that a the is ordered situation bigger than reference voltage, because current flowing resistance 28 etc., for this state, discharge lamp still is present in transition region.
Figure 12 is expression is used for controlling the supply power of exporting to another discharge lamp according to the state of lighting a lamp of a discharge lamp a control circuit formation example.
This circuit carries out power control when the light beam irradiates of travelling has entered normal condition with discharge lamp lighting, make and export to the intersection car light beam irradiates power-handling capability of the supply power of discharge lamp less than it, basically the formation with shown in Figure 9 is identical, but following this point is different, power adjusting circuit 16 ' is accepted the output signal SC of the above-mentioned state measurement circuit 30 of lighting a lamp, and makes control current (reference arrow 5) flow into the inverting input of intersection car light beam irradiates with the relevant correction amplifier 10 of discharge lamp power control.
Promptly, when power adjusting circuit 16 ' has been accepted signal SC and the known light beam irradiates of travelling and has been entered normal condition with discharge lamp after lighting a lamp, then control and make the control current of direction shown in the arrow A 5 flow (current value of this direction is big more, exports to intersection car light beam irradiates and will reduce with the supply power of discharge lamp.)。
Figure 13 and Figure 14 represent that the basiccircuit of power adjusting circuit constitutes example.
Among Figure 13, the analog switch 32 (for example can adopt formations such as field effect transister) that moves by received signal SC and with its series connected resistance 33, make assigned voltage " Vc " supply with and revise amplifier's inverting input, when signal SC is H level (high level) (discharge lamp becomes in the normal condition), analog switch 32 becomes closure state, and the electric current of this moment is supplied with the correction amplifier's inverting input as the control current shown in Figure 12 arrow A 5.
Again, in the formation of Figure 14, be provided with two current mirroring circuits 34,35 for signal SC, the current mirroring circuit 34 of prime is made of two NPN transistors, the current mirroring circuit 35 of back level is made of two PNP transistors, and the negative terminal input of revising amplifier is supplied with in the collecting electrode output that is positioned at the PNP transistor of output stage.
Therefore, the electric current that flows through resistance 36 (linking to each other) according to the level of signal SC with the front stage transistor collecting electrode of current mirroring circuit 34 successively in current mirroring circuit repeatedly after, as the control current shown in the arrow A among Figure 12 5, supply with and revise amplifier's inverting input.
In addition, in these circuit, if replace signal SC etc. with described signal SH and SL, in addition suitable change also can constitute described power adjusting circuit 16 etc. certainly.Again,, known and to have adopted op amp to constitute (for example, the spy opens flat 4-141988 number bulletin etc.), therefore omitted explanation here them for above-mentioned tension measuring circuit and current measurement circuit.
From the above as can be known, according to invention 1, because each discharge lamp is at the supply power of the state of normally lighting a lamp The value sum is less than each discharge lamp power-handling capability sum, so the load reduction of lamp circuit. So, right In the device of circuit formation, needn't use withstand voltage height and expensive device capacious, can Make equipment miniaturization, and can reduce the cost. Again, can suppress light quantity and the irradiation light that makes two discharge lamps not Too bright, and energy-conservation effect is arranged.
According to invention 2, when making the light beam irradiates of travelling use discharge lamp lighting, the effect of the light of this discharge lamp is As irradiation light main in the light beam luminous intensity distribution that travels, therefore carry out power supply control to intersection car light The performance number that bundle irradiation is supplied with discharge lamp can be utilized photograph more efficiently less than its power-handling capability Penetrate light.
According to invention 3, discharge when simultaneously the light beam irradiates of travelling is used with discharge lamp and intersection car light beam irradiates When lamp is lit a lamp, the control of can lighting a lamp so that the performance number sum of supplying with to two discharge lamps when big and The load of lamp circuit is unlikely excessive.
According to invention 4,, make their peaked peak values not be the identical moment, the load that then can alleviate lamp circuit constantly owing to control for the magnitude of power of supplying with two discharge lamps.
According to invention 5, after the light beam irradiates of travelling enters normal condition with discharge lamp lighting, make magnitude of power from discharge lamp to intersection car light beam irradiates that supply with less than its power-handling capability owing to control, then can enough intersection car light beam irradiates replenish the light beam irradiates of travelling with the in stable condition needed light quantity before of lighting a lamp of discharge lamp with the irradiates light of discharge lamp.In other words be exactly, irrelevant with the light beam irradiates of travelling with the state of lighting a lamp of discharge lamp, magnitude of power from discharge lamp to intersection car light beam irradiates that to supply with from moment that this discharge lamp lighting begins just less than power-handling capability, light quantity is changed obviously, but then can prevent these problems according to the present invention.
Claims (5)
1. discharging lamp device for vehicle, possess the light beam irradiates of travelling with discharge lamp, intersection car light beam irradiates with discharge lamp and can light a lamp the simultaneously lamp circuit of control of two discharge lamps be is characterized in that,
When the normal condition of described two discharge lamp lightings, carry out power supply control, make and supply with the power-handling capability sum of the magnitude of power sum of each discharge lamp less than each discharge lamp.
2. discharging lamp device for vehicle as claimed in claim 1 is characterized in that,
When the light beam irradiates of travelling is lit a lamp with discharge lamp simultaneously with discharge lamp and intersection car light beam irradiates, carry out power supply control, feasible supply travel light beam irradiates with discharge lamp greater than the power-handling capability of this discharge lamp, and make and supply with intersection car light beam irradiates with the magnitude of power of discharge lamp power-handling capability less than this discharge lamp.
3. discharging lamp device for vehicle as claimed in claim 1 is characterized in that,
When the light beam irradiates of will travelling is simultaneously used discharge lamp lighting with discharge lamp and intersection car light beam irradiates, carry out power supply control, make supply with the light beam irradiates of travelling with discharge lamp or intersection car light beam irradiates with the magnitude of power of discharge lamp power-handling capability less than this discharge lamp.
4. discharging lamp device for vehicle as claimed in claim 1 is characterized in that,
When the light beam irradiates of will travelling is simultaneously used discharge lamp lighting with discharge lamp and intersection car light beam irradiates, carry out power supply control, make that the magnitude of power of a discharge lamp supply in two side's discharge lamps is that the peaked moment is that the peaked moment is slow than the magnitude of power of supplying with to another discharge lamp.
5. discharging lamp device for vehicle as claimed in claim 1 is characterized in that,
Use under the state of discharge lamp lighting in intersection car light beam irradiates, when the light beam irradiates of will travelling is used discharge lamp lighting, carry out power supply control, make and rise when after the light beam irradiates of travelling is with discharge lamp lighting, entering normal condition, reduce to make its power-handling capability less than it to the magnitude of power of intersection car light beam irradiates with the discharge lamp supply.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25746799 | 1999-09-10 | ||
| JP257467/1999 | 1999-09-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1287932A true CN1287932A (en) | 2001-03-21 |
| CN1188303C CN1188303C (en) | 2005-02-09 |
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ID=17306727
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB001270451A Expired - Fee Related CN1188303C (en) | 1999-09-10 | 2000-09-11 | Discharging lamp device for vehicle |
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| Country | Link |
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| CN (1) | CN1188303C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104723940A (en) * | 2013-12-20 | 2015-06-24 | 国家电网公司 | Vehicle amp control method and device |
-
2000
- 2000-09-11 CN CNB001270451A patent/CN1188303C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104723940A (en) * | 2013-12-20 | 2015-06-24 | 国家电网公司 | Vehicle amp control method and device |
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| Publication number | Publication date |
|---|---|
| CN1188303C (en) | 2005-02-09 |
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