CN1822733A - Lighting system for vehicle - Google Patents
Lighting system for vehicle Download PDFInfo
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- CN1822733A CN1822733A CN200610003115.1A CN200610003115A CN1822733A CN 1822733 A CN1822733 A CN 1822733A CN 200610003115 A CN200610003115 A CN 200610003115A CN 1822733 A CN1822733 A CN 1822733A
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Abstract
The present invention provides one vehicle lamp system with one signal line connected to the lamp and the judging circuit and capable of judging abnormal lighting element number and abnormal element inside the lamp. The lamp system includes a lamp with a light emitting part comprising parallelly connected light emitting elements and a breaking detecting circuit for detecting the breaking in the light emitting elements; and a judging circuit with one signal line connected to the breaking detecting circuit for judging the abnormality of the light emitting elements. After the breaking detecting circuit outputs the potential of the broken light emitting element through the signal line, the judging circuit judges the abnormal light emitting element according to the potential of the signal line.
Description
Technical field
The present invention relates to a kind ofly, particularly relate to a kind of lamp system for vehicle with the luminous control unit that is used to control light-emitting component with the lamp of a plurality of light-emitting components as light source.
Background technology
In for motor vehicle lamp, be applied in practice in recent years with the lamp of the light-emitting components such as light-emitting diode lower than bulb power consumption, that the life-span is long as light source.In such lamp, because the luminous quantity of light-emitting component is littler than bulb, so constitute light source by a plurality of light-emitting components, for example as shown in Figure 8, in lamp LP, adopt to constitute a plurality of light-emitting diode row L1, L2, L3 that the light-emitting diode 21 with specified quantity is connected in series, and a plurality of light-emitting diode row L1, L2, L3 are connected in parallel and luminous structure with respect to power supply terminal TV and earth terminal TG.In like this with the lamp of a plurality of light-emitting diodes as light source, even cause unusually under non-luminous situation because of opening circuit etc. at a part of light-emitting diode, also can utilize the luminous of other light-emitting components, satisfy the desired luminous intensity distribution specification of lamp, but when the quantity of unusual light-emitting diode increases, just do not satisfy this luminous intensity distribution specification.Must be useful on and detect the unusual of light-emitting diode, the particularly broken circuit detection circuit that opens circuit of light-emitting diode.
As the technology that opens circuit that detects light-emitting diode, in technology shown in Figure 12, be provided for respectively the broken circuit detection circuit 22A that opens circuit and detect of a plurality of diode row L1, L2, L3, utilized among this broken circuit detection circuit 22A to detect the potential change that produces when opening circuit.That is to say, broken circuit detection circuit 22A has and detects each light-emitting diode row L1 respectively, L2, the test section D1 that opens circuit that opens circuit of L3, D2, D3, at the test section D1 that respectively opens circuit, D2, among the D3, triode Tr1 is set, Tr2, Tr3, they by will with light-emitting diode row L1, L2, the load resistance RL1 that L3 is connected in series, RL2, the both end voltage of RL3 inputs to base resistance RB1, RB2, RB3, and carry out conducting, by action, will be by this triode Tr1, Tr2, the collector resistance R1 of Tr3, R2, the collector voltage that R3 produces, by holding wire SL1, SL2, SL3 outputs to respectively among the decision circuit 5A of control unit CNT.In the present example, owing to 3 open circuit test section D1, D2, D3 are set with respect to 3 light-emitting diode row L, so respectively open circuit test section D1, D2, D3 are connected on the decision circuit 5A by holding wire SL1, SL2, SL3 respectively.Utilize decision circuit 5A, collector voltage when ending because of the light-emitting diode row produce the triode that opens circuit by holding wire SL1, SL2, SL3 identification, compare by collector voltage and the determinating reference voltage that this is identified, judge the opening circuit of light-emitting diode row, promptly unusually.
In this technology, by produced the holding wire of change in voltage by decision circuit 5A identification, can judge among open circuit test section D1, D2, the D3 that is connected with this holding wire unusual, be opening circuit of light-emitting diode row L1, L2, L3.In addition, by the corresponding light-emitting diode row of the unusual test section that opens circuit of identification and generation, can be listed in the interior allocation position of lamp by interior number and the light-emitting diode that produces unusual light-emitting diode row of identification light, thereby can judge exactly whether lamp satisfies the luminous intensity distribution specification of stipulating.But, in this technology, because must and open circuit test section and make holding wire corresponding one by one, so need the radical of the holding wire of light-emitting diode number of columns, the problem that exists the distribution number that connects decision circuit and lamp to increase with respect to a plurality of light-emitting diodes row.Particularly, under each lamp with vehicle right and left was connected respectively to situation on the decision circuit, the distribution number needed the radical of twice, existed the number of lead wires that connects lamp and decision circuit to increase and weight and cost increase, and connector maximizes, the problem of heavy-duty.
To this, in patent documentation 1, employing will be separately positioned on the test section that opens circuit that a plurality of light-emitting diodes list and be connected jointly on the holding wire, and the structure that is connected with the decision circuit of control unit is as the structure of the broken circuit detection circuit that opens circuit that is used to detect the light-emitting diode row.In patent documentation 1, can judge unusual in the light-emitting diode row by the potential change of discerning this holding wire by decision circuit, therefore the holding wire that connects lamp and control unit have 1 just passable, effective in realization miniaturization, weight reduction, aspect reducing cost.
Patent documentation 1: the spy opens the 2004-122913 communique
Summary of the invention
But, in the technology of patent documentation 1, be connected jointly on the holding wire owing to will be separately positioned on the test section that opens circuit that a plurality of light-emitting diodes list, can not discern the problem that produces unusual light-emitting diode row so exist.That is to say, in the technology of patent documentation 1, can judge that from the potential change of holding wire some light-emitting diode row have produced unusual, but no matter be that 1 light-emitting diode row produces unusual situation, still a plurality of light-emitting diode row produce unusual situation, the potential change of holding wire all is constant, can not discern the unusual of them.In addition, even because under the unusual situation of some generations of a plurality of light-emitting diodes row, the potential change of holding wire also all is identical, has produced unusual so can not judge the light-emitting diode row on which position that is configured in the lamp.Therefore, judging when unusual, can not judge that lamp satisfies the luminous intensity distribution specification and unusual in the scope of proper function, still do not satisfy luminous intensity distribution specification state under unusually, existence can not effectively utilize the problem that is arranged on the broken circuit detection circuit on the lamp.
The purpose of this invention is to provide a kind of lamps apparatus for vehicle, it connects lamp and decision circuit by 1 holding wire, can judge the quantity of unusual light-emitting component.Particularly, can judge accurately produced in 1 or 2 light-emitting components unusual.In addition, the invention provides a kind of lamp system for vehicle, it can judge the position that unusual light-emitting component disposes in lamp.
The invention is characterized in to have: lamp, this light fixture have illuminating part that a plurality of light-emitting components are connected in parallel and the broken circuit detection circuit that opens circuit that detects each light-emitting component; And decision circuit, it utilizes 1 holding wire to be connected with broken circuit detection circuit, be used to judge the unusual of light-emitting component, its structure is, broken circuit detection circuit is to holding wire output and detect the corresponding current potential of the light-emitting component that opens circuit, decision circuit is judged unusual light-emitting component according to the current potential of this holding wire.In the present invention, the structure of broken circuit detection circuit is, has a plurality of test sections that open circuit that open circuit that detect a plurality of light-emitting components respectively, corresponding to the detection of opening circuit by the test section that respectively opens circuit, and the output different potentials.
In addition, broken circuit detection circuit has: reference resistance, and it is connected between holding wire and the 1st current potential; And detection resistance, it does not detect when opening circuit at the test section that respectively opens circuit, and is connected between holding wire and the 2nd current potential.Perhaps, broken circuit detection circuit has: reference resistance, and it is connected between holding wire and the 1st current potential; And detection resistance, it detects when opening circuit at the test section that respectively opens circuit, and is connected between holding wire and the 2nd current potential.In this case, preferably make the resistance value of reference resistance be the low low resistance of resistance value than detection resistance.In addition, in the latter case, preferred broken circuit detection circuit is connected has the detection resistance that holding wire opens circuit and detects usefulness between holding wire and the 2nd current potential, when it opens circuit with holding wire or the power supply of the supply illuminating part mode that electric current does not flow through when stopping to constitute.
The effect of invention
By the present invention, the number of the light-emitting component that opens circuit according to generation and the allocation position in lamp change to the current potential of holding wire output.Decision circuit can be judged the number of unusual light-emitting component and the allocation position in lamp according to the current potential of holding wire.Therefore, by only connecting lamp and decision circuit by 1 holding wire, judgement according to decision circuit, can judge that light-emitting component produces unusual lamp and whether satisfies the luminous intensity distribution specification, thereby can realize connecting the miniaturization and the lightweight of the conductor structure of lamp and decision circuit, simultaneously, can effectively utilize broken circuit detection circuit and the decision circuit that constitutes lamps apparatus for vehicle.In addition,, can make current potential and the potential difference between current potential just often under 1 of light-emitting component or 2 unusual situations become big, obtaining the judgement leeway in the decision circuit, thereby can correctly judge by the present invention.In addition, under the unusual situation of generations such as holding wire opens circuit, also can judge.
Description of drawings
Fig. 1 has been to use the stereogram of the partly cut-away of taillight of the present invention.
Fig. 2 is the circuit structure diagram of embodiment 1.
Fig. 3 is the equivalent circuit diagram of broken circuit detection circuit and the voltage characteristic figure of explanation detection effect.
Fig. 4 is the equivalent circuit diagram and the voltage characteristic figure of the variation of broken circuit detection circuit.
Fig. 5 is the equivalent circuit diagram and the voltage characteristic figure of other variation of broken circuit detection circuit.
Fig. 6 is the equivalent circuit diagram and the voltage characteristic figure of another variation of broken circuit detection circuit.
Fig. 7 is the circuit structure diagram of the variation of embodiment 1.
Fig. 8 is the circuit structure diagram of embodiment 2.
Fig. 9 is the equivalent circuit diagram of the detection effect of explanation broken circuit detection circuit.
Figure 10 is the voltage characteristic figure of broken circuit detection circuit.
Figure 11 makes light-emitting diode classify the voltage characteristic figure of the broken circuit detection circuit under the situation of 9 row as.
Figure 12 is the circuit structure diagram of existing broken circuit detection circuit.
Embodiment
Below, with reference to accompanying drawing embodiments of the invention are described.Fig. 1 is the embodiment that the present invention is used for the light fixture of automobile, for example, is the example that is used among the taillight TL of automobile.In making the container-like lamp main body 1 of tray, circuit substrate 2 is installed, arranges on this circuit substrate 2 and carry a plurality of light-emitting diodes (LED) 21 as light-emitting component.In addition, lens 3 are installed on the front openings of described lamp main body 1, are sealed described circuit substrate 2.Described circuit substrate 2 is made of printed circuit board (PCB), and described light-emitting diode 21 is installed on demand arrangement on the surface of circuit substrate 2, constitutes illuminating circuit with respect to printed wiring respectively, luminous illuminating part 20 when constituting power supply.As light-emitting diode 21, discrete type (discrete) light-emitting diode or sheet type (chip) light-emitting diode can.In addition, also can between circuit substrate 2 and lens 3, dispose and be used to make optical convergence that light-emitting diode 21 penetrates or the speculum of dispersing.On described circuit substrate 2, constitute broken circuit detection circuit 22, its be used to detect the light-emitting diode 21 that constitutes described illuminating part 20 unusually, the opening circuit of the distribution that here is electrically connected for light-emitting diode 21 with to them.
As shown in Figure 2, described taillight TL is connected with control unit CNT, and is luminous by this control unit CNT control.Here, described control unit CNT separates with described taillight TL and is arranged on the car body side, but also can be arranged to be integral with taillight TL.Fig. 2 is the equivalent circuit diagram of described taillight TL and control unit CNT, in described taillight TL, the illuminating part 20 that on described circuit substrate 2, constitutes, connected and constituted the light-emitting diode row by the series connection of the light-emitting diode of specified quantity, a plurality of light-emitting diodes are listed between power supply terminal TV and the earth terminal TG and are connected in parallel simultaneously.Here for the purpose of simplifying the description, respectively 3 light-emitting diodes 21 are connected in series and constitute the 1st to the 3rd light-emitting diode row L1, L2, L3, in addition, these the 1st to the 3rd light-emitting diode row L1, L2, L3 are connected in parallel with respect to power supply.When power supply terminal TV provided needed voltage, these light-emitting diodes were all luminous.
On the other hand, broken circuit detection circuit 22 connects the 1st to the 3rd open circuit test section D1, D2, D3 respectively on described the 1st to the 3rd light-emitting diode row L1, L2, L3.Respectively open circuit test section D1, D2, load resistance RL1, RL2, RL3 that D3 has to be connected in series with each light-emitting diode row L1, L2, L3, and utilize the voltage that produces at the two ends of these load resistances RL1, RL2, RL3 carry out conducting, by triode Tr1, Tr2, the Tr3 of action.The base stage of each triode Tr1, Tr2, Tr3 is connected on described load resistance RL1, RL2, the RL3 by base resistance RB1, RB2, RB3, is connected with collector resistance R1, R2, R3 on the collector electrode of each triode Tr1, Tr2, Tr3.And, each collector resistance R1, R2 of a plurality of open circuit test section D1, D2, D3, R3 respectively be connected signal terminal TS on bridging line CL be connected.
In addition, the power supply terminal TV of the circuit substrate 2 of described taillight TL is connected with described control unit CNT by a pair of power supply wiring VL, GL with earth terminal TG, and described signal terminal TS is connected with control unit CNT by holding wire SL.Control unit CNT has power circuit 4 and decision circuit 5, and as power supply, generation is used for the driven for emitting lights diode and makes its luminous luminous voltage VA power circuit 4, and the operating voltage Vcc of described decision circuit 5 with Vehicular accumulator cell BAT.Described luminous voltage VA utilizes described power supply wiring VL to offer described power supply terminal TV, utilizes this luminous voltage VA to make described light-emitting diode 21 luminous.
Described decision circuit 5 has according to being input to voltage among the input terminal IN judges that illuminating part is 20 unusual, is the unusual function of light-emitting diode 21 that the holding wire SL that is connected with the signal terminal TS of described taillight TL is connected on this input terminal IN.In addition, be connected with reference resistance Rb on this holding wire SL and between the described operating voltage Vcc, moving operating voltage Vcc on this holding wire SL.This reference resistance Rb is a part that constitutes the key element of described broken circuit detection circuit 22, but, reference resistance Rb is configured in control unit CNT one side that is connected with taillight TL here.
By above structure, the luminous voltage VA that produces in the power circuit 4 of control unit CNT is by power supply wiring VL, VG, when offering the circuit substrate 2 in the taillight TL, they are just all luminous if light-emitting diode 21 is normal, illuminating part 20 is luminous with the luminous quantity of regulation, and taillight TL becomes the state of lighting a lamp.Here, if respectively be listed as whole lumination of light emitting diode among each light-emitting diode row L1～L3, then owing to flow through predetermined electric current in these light-emitting diode row, the both end voltage of load resistance RL1～RL3 of test section D1～D3 is imported on the base stage of triode Tr1, Tr2, Tr3 so respectively open circuit, and triode Tr1, Tr2, Tr3 become conducting state.Therefore, collector resistance R1, R2, R3 are connected on the bridging line CL, flow through the collector current that produces by operating voltage Vcc by holding wire SL, thus to the input terminal IN of decision circuit 5 input by reference resistance Rb and collector resistance R1, R2, R3 with operating voltage Vcc voltage after partial Vd.That is to say, collector resistance R1, R2, R3 when not detecting the opening circuit of each light-emitting diode row L1, L2, L3, just often, being connected bridging line CL is between holding wire SL and the earth terminal TG, holding wire SL is drop-down to earthing potential one side, thus, play the function that is used to detect into normal detection resistance.
Here, shown in Fig. 3 (a), establishing the 1st resistance value of collector resistance R1 that opens circuit test section D1 is r1, and the resistance value of the collector resistance R2 of the 2nd disconnected test section D2 is r2, the 3rd resistance value of collector resistance R3 that opens circuit test section D3 is r3, and the resistance value of reference resistance Rb is rb.Because 3 collector resistance R1, R2, R3 are connected in parallel, so if flow through electric current among each collector resistance R1, R2 of respectively open circuit test section D1, D2, D3, the R3, the branch pressure voltage Vd that then is input in the decision circuit 5 is:
Vd＝〔rx/(rx+rb)〕·Vcc …(a)
Here,
rx＝1/(1/r1+1/r2+1/r3) …(b)
All equal rb if establish the resistance value rb of reference resistance Rb and the 1st to the 3rd collector resistance R1, R2, resistance value r1, the r2 of R3, r3, then under each light-emitting diode row L1, the normal situation of L2, L3 be:
rx＝rb/3
Vd＝(1/4)·Vcc
,, become non-luminous state here, then in comprising the light-emitting diode row of this light-emitting diode, do not flow through electric current, become off state if the light-emitting diode that is included in certain light-emitting diode row produces unusually.For example, if certain 1 light-emitting diode row is unusual, then do not flow through electric current in load resistance RL1, the RL2 of unusual open circuit test section D1, D2, D3, RL3, triode Tr1, Tr2, the Tr3 of this open circuit test section D1, D2, D3 become cut-off state.Thus, the collector resistance R1 of this triode, R2, R3 become the state that is not connected between holding wire SL and the earth terminal TG.Therefore, (b) rx in the formula becomes rx=rb/2, by the Vd in (a) formula:
Vd1＝(1/3)·Vcc
If 2 light-emitting diodes row are unusual, rx=rb then,
Vd2＝(1/2)·Vcc
If 3 light-emitting diodes row are all unusual, rx=0 then,
Vd3＝Vcc
Follow branch pressure voltage Vd that 3 light-emitting diodes row obtain unusually shown in Fig. 3 (b) by above.Like this, owing to the different branch pressure voltage Vd differences of quantity, so, can judge the number of unusual light-emitting diode row by discerning this branch pressure voltage Vd by decision circuit 5 to decision circuit 5 inputs because of unusual light-emitting diode row.Therefore, for example produce the luminous intensity distribution specification that can satisfy taillight TL when unusual being set at 1 light-emitting diode row, 2 light-emitting diodes row produce under the situation of the luminous intensity distribution specification that is difficult to satisfy taillight TL when unusual, by in decision circuit 5, being set between Vd1 and the Vd2 in advance with reference to voltage Vref, as long as contrast branch pressure voltage Vd, just can judge that taillight TL's is unusual with reference voltage Vref.
Here, in embodiment 1, because the resistance value rb of reference resistance Rb is equated with collector resistance R1, R2, each resistance value r1, r2 of R3, the r3 of respectively open circuit test section D1, D2, D3, to be listed as voltage difference between the branch pressure voltage Vd1 of generation when unusual be voltage difference less than 0.17Vcc so 2 light-emitting diode row produce branch pressure voltage Vd2 when unusual and 1 light-emitting diode.Therefore, judge that the leeway of the reference voltage Vref when 1 row open circuit and 2 row open circuit diminishes, must improve the judgement precision.So shown in Fig. 4 (a), when making r1=r2=r3=ra, the resistance value rb that makes reference resistance Rb is the resistance value from 1/2 to ra the scope of the resistance value ra of each collector resistance.Promptly
1/2·ra＜rb＜ra …(c)
Thus, can make the voltage difference of Vd1 and Vd2 bigger, can enlarge the voltage range when setting reference voltage Vref than the characteristic of Fig. 3, relax judge precision aspect favourable.
In addition, described (c) formula has been omitted detailed explanation, but obtains as follows.That is to say that because be expressed as: the branch pressure voltage Vd1 when 1 row open circuit is
Vd1＝Vcc·〔ra/(ra+rb)〕
Branch pressure voltage Vd2 when 2 row open circuit is
Vd2＝Vcc·〔1/2·ra/(1/2·ra+rb)〕
So, from this two formula voltage difference Vd2-Vd1 is carried out computing, in this arithmetic expression, be constant with ra, rb is a variable, tries to achieve the value that will make Vd2-Vd1 and becomes big ra and the relation of rb.
Therefore, in Fig. 4 (b), as an example that satisfies (c) formula, represented to make the example of rb=3/4ra, voltage Vd0 just often is:
Vd0＝0.3·Vcc
Voltage Vd1 under unusual (opening circuit) situation of 1 light-emitting diode row is:
Vd1＝0.4·Vcc
Voltage Vd2 under 2 light-emitting diode row abnormal conditions is:
Vd2＝0.571·Vcc
Therefore, 1 row open circuit and 2 row each branch pressure voltage Vd1, Vd2 of opening circuit as shown in the drawing, as can be seen, the voltage difference that can make Vd1 and Vd2 is greater than 0.17Vcc, enlarged than the voltage difference of the characteristic of Fig. 3 (b).
Similarly, make 3 light-emitting diodes row all just often branch pressure voltage Vd0 and 1 light-emitting diode potential difference of being listed as the branch pressure voltage Vd1 of (1 row open circuit) when unusual become big, thereby increase the leeway of determinating reference voltage Vref, the computing by as hereinbefore makes
1/5ra＜rb＜ra gets final product.
On the other hand, the branch pressure voltage Vd3 in the time of also can making 3 light-emitting diodes row all unusual (=Vcc) and only 1 light-emitting diode row just often the potential difference of the branch pressure voltage Vd2 of (2 row open circuit) diminish.Make rb＜ra in this case.For example, shown in Fig. 5 (a) and (b), make under the situation of rb=1/2ra, voltage Vd0 just often is:
Vd0＝0.4·Vcc
Voltage Vd1 under the situation of 1 light-emitting diode row unusual (opening circuit) is:
Vd1＝0.5·Vcc
Voltage Vd2 under the unusual situation of 2 light-emitting diodes row is:
Vd2＝0.666·Vcc
Therefore, branch pressure voltage Vd2 can be set in high voltage one side, make judge that 1 row open circuit, branch pressure voltage Vd3, Vd2 when 2 row open circuit, the corresponding increase of voltage difference of Vd1, thereby enlarge leeway.Thus, the voltage range in the time of can enlarging the reference voltage Vref that opens circuit that sets the light-emitting diode row be used to judge specified quantity, relax judgement precision when judging the luminous intensity distribution specification of taillight TL by this determinating reference voltage Vref aspect favourable.
Also can judge opening circuit of each light-emitting diode here, by a plurality of light-emitting diodes being disposed the test section that opens circuit respectively.Particularly, under the number and columns situation how of the light-emitting diode that is connected in parallel, as shown in Figure 5, be the little resistance of resistance value, judge that to enlarging leeway is very effective than detection resistance (collector resistance) by the resistance value that makes reference resistance Rb.
In addition in the present invention, also can make the value of each collector resistance R1, R2, R3 of the 1st to the 3rd open circuit test section D1, D2, D3 differing from each other.For example, shown in Fig. 6 (a), make rd=r1＜r2 (=2r1)＜r3 (=4r1).Here, the rx that asks the 1st light-emitting diode row L1 to produce the branch pressure voltage Vd when unusual is rx=1/ (1/r2+1/r3), the rx that the 2nd light-emitting diode row L2 produces when unusual is rx=1/ (1/r1+1/r3), and the rx that the 3rd light-emitting diode row L3 produces when unusual is rx=1/ (1/r1+1/r2).In addition, the rx that the 1st light-emitting diode row L1 and the 2nd light-emitting diode row L2 produce when unusual simultaneously is rx=1/r3, the rx that the 1st light-emitting diode row L 1 and the 3rd light-emitting diode row L3 produce when unusual simultaneously is rx=1/r2, the rx that the 2nd light-emitting diode row L2 and the 3rd light-emitting diode row L3 produce when unusual simultaneously is rx=1/r1, can obtain branch pressure voltage Vd according to these rx under arbitrary situation.
Therefore, produce respectively when unusual at the 1st light-emitting diode row L1, the 2nd light-emitting diode row L2 and the 3rd light-emitting diode row L3, and these light-emitting diode row L1, L2, L3 have 2 or 3 simultaneously and all produce branch pressure voltage Vd when unusual as Fig. 6 b) shown in.Here, about concrete numerical value, only explanation is omitted in expression in the figure.Decision circuit 5 is by judging this branch pressure voltage Vd, can judge separately unusual of the 1st to the 3rd light-emitting diode row L1～L3 exactly.In this case, resistance value rb that can certainly be by making reference resistance Rb in advance is littler than collector resistance (detection resistance) R1, R2, resistance value r1, the r2 of R3, r3, increases the judgement leeway of judging in the decision circuit 5 when unusual.Particularly, the method for carrying out judgement, the abnormality processing of luminous intensity distribution specification because of the position of the light-emitting diode that opens circuit can be different, and handle such situation aspect favourable.
In addition, in embodiment 1, because reference resistance Rb is arranged on control unit CNT one side, so under the situation that the holding wire SL that connects taillight TL and control unit CNT opens circuit, perhaps and under the situation of power supply short circuit in reference resistance Rb short circuit, because branch pressure voltage Vd is Vcc, so become unusual situation in the same manner with whole light-emitting diode row, TL is judged to be unusually with taillight.On the contrary, under the situation of holding wire SL ground short circuit, because branch pressure voltage Vd is an earthing potential, i.e. 0V is so also be judged to be taillight TL in this case unusually.These judgements be because, produce unusual and can not correctly judge under the unusual or normal situation of taillight at holding wire SL, can be by taillight TL be judged to be unusually, and with in the holding wire be included in unusually taillight TL unusually in judge.
In embodiment 1, branch pressure voltage Vd according to holding wire SL, utilize the decision circuit 5 of control unit CNT to judge unusual, but also can constitute in such a way, promptly as shown in Figure 7,, constitute decision circuit 5 by microcomputer, insert A/D (analog/digital) translation circuit 6 in input terminal IN one side, branch pressure voltage Vd is input in the decision circuit 5 as digital value, judge unusual according to the digital value of this input by decision circuit 5.In addition, constitute the triode that is arranged on respectively open circuit test section D1, D2, D3 on the taillight TL, can certainly constitute by MOS type triode.
In this lamp, it is few that 3 row or the above light-emitting diode of 3 row are listed as simultaneously unusual situation, in the reality, is mostly the unusual situation of a small amount of light-emitting diode row that 1 row or 2 row are such.In the explanation of embodiment 1, the situations of light-emitting diode being classified as 3 row are illustrated, if but in embodiment 1 light-emitting diode classify multiple row as, then be listed as when unusual at the light-emitting diodes of judging 2 row, can produce the problem in the leeway of branch pressure voltage Vd.For example, in embodiment shown in Figure 31, under the resistance value r1=r2=r3 that makes resistance R 1, R2, R3 and condition that the resistance value rb of resistance R b equates, the voltage characteristic of the branch pressure voltage Vd when supposing to make light-emitting diode classify 9 row as is shown in Figure 11 (a).Judge thus, if the light-emitting diode row are many, then light-emitting diode classify as 2 row when unusual branch pressure voltage Vd2 and the voltage difference of branch pressure voltage Vd0 just often be this very little voltage difference of 0.04Vcc, to judge this voltage difference and judge and leeway difficulty when unusual be difficult to carry out the high judgement of precision.So, in embodiment 2, enlarge this just often branch pressure voltage Vd0 and branch pressure voltage when unusual of 1 row or 2 row, this be and the branch pressure voltage Vd2 of 2 row when unusual between voltage difference, the leeway when realizing enlarging abnormality juding.
Fig. 8 is the circuit structure diagram of embodiment 2, with the part of embodiment 1 equivalence in adopt same numeral.Embodiment 2 is identical with embodiment 1, and expression is made of the example of lamp the 3 row light-emitting diodes row that 3 light-emitting diode series connection are connected.In Fig. 8, on each light-emitting diode row L1, L2, L3, connect and compose open circuit test section D 1, D2, the D3 of the test section 22 that opens circuit respectively, respectively open circuit test section D1, D2, D3 are made of two NPN triodes respectively.For example the test section D1 that opens circuit is described, it has the 1st and the 2nd triode Tr11, Tr12, load resistance RL1 with light-emitting diode row L1 is connected in series is connected to the mode of the base stage input of the 1st triode by base resistance RB11 with the voltage that produces at these load resistances RL1 two ends.The collector electrode of described the 1st triode Tr1 is connected on the supply voltage VA by collector resistance RC1, is connected on the base stage of the 2nd triode Tr12 by base resistance RB12 simultaneously.The collector electrode of the 2nd triode Tr12 is by as the collector resistance R1 that detects resistance, is connected with bridging line CL on being connected signal terminal TS.
In this opened circuit test section D1, if light-emitting diode row L1 opens circuit, then the voltage at the two ends of load resistance RL1 reduced, and the 1st triode Tr11 ends.Therefore, current potential offers the base stage of the 2nd triode Tr12, the 2nd triode Tr12 conducting by collector resistance RC1.Like this, collector resistance R1 is connected on the bridging line CL, by holding wire SL, flows through the collector current that is produced by operating voltage, thus in the input terminal IN of decision circuit 5, input by reference resistance Rb and collector resistance R1 with operating voltage Vcc voltage after partial Vd.That is to say that collector resistance R1 and embodiment 1 play the function of the unusual detection resistance that is used to detect light-emitting diode row L1 in the same manner.
About test section D2, the D3 of opening circuit, also be similarly, respectively with the 1st and the 2nd triode, be that Tr21 and Tr22, Tr31 and Tr32 constitute main body, make the 1st triode Tr21, Tr31 conducting by both end voltage with each light-emitting diode row L2, load resistance RL2, RL3 that L3 is connected, if light-emitting diode row L2, L3 open circuit, then each the 1st triode Tr21, Tr31 end.End by this, current potential offers the base stage of the 2nd triode Tr22, Tr32 by collector resistance RC2, RC3, each the 2nd triode Tr22, Tr32 conducting, be connected on the bridging line CL as the collector resistance R2, the R3 that detect resistance, operating voltage Vcc carried out dividing potential drop with reference resistance Rb.
In addition, in embodiment 2, be provided for holding wire that signal lines SL the opens circuit test section DS that opens circuit.The holding wire test section DS that opens circuit is made of a NPN triode Tr4, its base stage be connected the base resistance RB41 between power supply terminal TV and the earth terminal TG, the tie point of RB42 is connected.In addition, the collector electrode of triode Tr4 is connected on the described bridging line CL by having the collector resistance R4 that is used for the detection resistance function that signal lines opens circuit.
In addition, the structure of described control unit CNT is also roughly the same with embodiment 1, has power circuit 4 and decision circuit 5, power circuit 4 with Vehicular accumulator cell BAT as power supply, generation is used for the driven for emitting lights diode and makes the operating voltage Vcc of its luminous luminous voltage VA and described decision circuit 5.On the basis of this structure, the control unit CNT of embodiment 2 inserts the switching transistor FET that is made of the field effect triode on the VA of described power circuit terminal, has this switching transistor FET is carried out conducting, ends the power control circuit 7 that moves.This power control circuit 7 can be controlled by decision circuit 5, and the constituted mode of decision circuit 5 is when carrying out conducting by 7 couples of switching transistor FET of power control circuit, ending action, can discern its conducting or cut-off state.So, utilize power supply wiring VL to offer the power supply terminal TV of taillight TL by the luminous voltage VA of switching transistor FET.In addition, connect operating voltage Vcc on the signal terminal TS that is connected on the bridging line CL, this is identical with embodiment 1.
By the structure of embodiment 2, make switching transistor FET conducting by power control circuit 7, the luminous voltage VA of power circuit 4 offers power supply terminal TV by power supply wiring VL, the illuminating part 20 of taillight TL, is that each light-emitting diode row L1, L2, L3 are luminous.In addition, if holding wire SL is normal, then decision circuit 5 detects the voltage of bridging line CL by signal terminal TS and holding wire SL.Normal when luminous at light-emitting diode row L1, L2, L3, the 1st triode Tr11, Tr12, the Tr13 conducting of test section D1, D2, D3 owing to respectively open circuit, so the 2nd triode Tr21, Tr22, Tr23 end, in detecting resistance R 1, R2, R3, do not flow through electric current.On the other hand, holding wire opens circuit test section DS owing to triode Tr4 conducting, so flow through electric current in detecting resistance R 4.Its result just often shown in the equivalent electric circuit of expression among Fig. 9 (a), connects reference resistance Rb and detects resistance R 4 on bridging line CL, the current potential of the bridging line CL that is detected by decision circuit 5 is:
Vd0＝〔r4/(rb+r4)〕·Vcc
If some, for example light-emitting diode row L1 of light-emitting diode row L1, L2, L3 open circuit, then the 1st triode Tr11 owing to this test section D1 that opens circuit ends, so the 2nd triode Tr12 conducting detects in the resistance R 1 and flows through electric current.Its result shown in the equivalent electric circuit of expression among Fig. 9 (b), connects reference resistance Rb and detects resistance R 1, R4 on bridging line CL, the current potential of the bridging line CL that is detected by decision circuit 5 is:
Vd1＝〔ry/(rb+ry)〕·Vcc …(d)
Wherein
ry＝1/(1/r1+1/r4) …(e)
Too, the r1 of (e) formula is replaced to r2 or r3 gets final product under some situations about opening circuit of light-emitting diode row L2, L3.
In addition, when having 2 to open circuit simultaneously in light-emitting diode row L1, L2, L3, for example when light-emitting diode row L1 and L2 opened circuit, equivalent electric circuit in the case, made the ry of (e) formula become shown in Fig. 9 (c)
Ry=1/ (1/r1+1/r2+1/r4) ... (e ') gets final product.Also obtain when in addition, light-emitting diode row L3 and light-emitting diode row L1 or L2 open circuit simultaneously by same method.Also obtain when in addition, light-emitting diode row L1, L2, L3 open circuit simultaneously by same method.
Here, in embodiment 2, each resistance value r1, the r2, r3, r4, the rb that detect resistance R 1, R2, R3, detection resistance R 4 and reference resistance Rb are equated respectively, be under the situation of rb=r1=r2=r3=r4, also can obtain effect of sufficient, but be the fully low low resistance of each resistance value than detection resistance R 1, R2, R3, R4 by the resistance value rb that makes reference resistance Rb, its effect can be better.For example,, shown in Figure 10 (a),, then become the voltage characteristic shown in Figure 10 (b) here if under the situation of 3/2rb=r1=r2=r3=r4, calculate the branch pressure voltage Vd that judges by decision circuit 5.Thus, voltage Vd0 just often is:
Vd0＝(3/5)·Vcc＝0.6·Vcc
Voltage Vd1 under the situation of 1 light-emitting diode row unusual (opening circuit) is:
Vd1＝(3/7)·Vcc＝0.429·Vcc
Voltage Vd2 under the unusual situation of 2 light-emitting diodes row is:
Vd2＝(1/3)·Vcc＝0.333·Vcc
Voltage Vd3 under all unusual situation of 3 light-emitting diodes row is:
Vd3＝(3/11)·Vcc＝0.273·Vcc
Therefore, in embodiment 2, each resistance value r1, the r2, r3, r4, the rb that detect resistance R 1, R2, R3, detection resistance R 4 and reference resistance Rb are equated respectively, under the situation of rb=r1=r2=r3=r4, if increase the quantity of light-emitting diode row, for example with shown in Figure 11 (a) in the same manner, expression is made of the voltage characteristic of the branch pressure voltage Vd under the situation of light-emitting diode row 9 row, then shown in Fig. 9 (b).That is to say that voltage Vd0 just often is:
Vd0＝(1/2)·Vcc＝0.5·Vcc
Voltage Vd1 under the situation of 1 light-emitting diode row unusual (opening circuit) is:
Vd1＝(1/3)·Vcc＝0.333·Vcc
Voltage Vd2 under the unusual situation of 2 light-emitting diodes row is:
Vd2＝(1/4)·Vcc＝0.25·Vcc
Voltage Vd3 under all unusual situation of 3 light-emitting diodes row is:
Vd3＝(1/5)·Vcc＝0.2·Vcc
Under this situation, branch pressure voltage Vd2 when light-emitting diode row 2 row are unusual and the voltage difference delta Vd between the voltage Vd0 just often are 0.25Vcc, and be bigger than the voltage difference 0.04Vcc of the embodiment 1 shown in Figure 11 (a).Therefore, can obtain decision circuit 5 judge that according to reference voltage Vref light-emitting diode row 2 row are unusual the time leeway, thereby can judge accurately.
In addition, be the fully low low-resistance value of each resistance value at the resistance value rb that makes reference resistance Rb than detection resistance R 1, R2, R3, R4, for example as shown in figure 10, making each resistance value of reference resistance Rb and detection resistance R 1, R2, R3, R4 is under the situation of 3/2rb=r1=r2=r3=r4, if expression is made of the voltage characteristic of the branch pressure voltage Vd under the situation of light-emitting diode row 9 row, then shown in Figure 11 (c).This voltage characteristic is identical with the characteristic shown in Figure 10 (b), light-emitting diode show 2 row when unusual branch pressure voltage Vd2 and the voltage difference delta Vd between the branch pressure voltage Vd0 just often be 0.266Vcc, certainly the voltage difference 0.04Vcc than the embodiment 1 shown in Figure 11 (a) is big, and is also bigger than the voltage difference delta Vd=0.25Vcc shown in Figure 11 (b).Therefore, what more can obtain decision circuit 5 judges that according to reference voltage Vref light-emitting diode shows the leeway of 2 row when unusual, thereby can judge accurately.
In addition, in embodiment 2 also with embodiment 1 in the same manner, also effective under the situation of rb=r1=r2=r3=r4, but as described, if make the resistance value of reference resistance, as be than the low low-resistance 3/2rb=r1=r2=r3=r4 of the resistance value that detects resistance, have rb＜＜relation of r1=r2=r3=r4 or rb＜＜relation of r4＜r1=r2=r3, then similarly, can make the voltage difference of voltage Vd0 and Vd1 or Vd2 become big, can obtain 1 row or the 2 row judgement leeway when unusual.In addition, also can be as shown in Example 1 in embodiment 2, increase 1 row when unusual branch pressure voltage Vd1 and the voltage difference Vd1-Vd2 between the branch pressure voltage Vd2 of 2 row when unusual, thereby can obtain judgement leeway among this voltage difference Vd1-Vd2.
In addition, in embodiment 2, when holding wire SL opens circuit, the triode Tr4 of test section DS ends because holding wire opens circuit, do not flow through electric current so be connected in the detection resistance R 4 on the bridging line CL, become Vd=Vcc, decision circuit 5 is judged to be holding wire SL and opens circuit.In addition, utilizing power control part 7 that switching transistor FET is ended, supply voltage VA does not offer under the situation of taillight TL, the triode Tr4 of holding wire test section DS also ends, become Vd=Vcc, but in decision circuit 5, FET is a cut-off state by the identification switch transistor, does not open circuit and holding wire SL is not judged to be.In addition, under the situation of the so-called power supply short circuit of holding wire and Vcc short circuit, also become Vd=Vcc, but in this case, be conducting state, can be different from opening circuit of holding wire SL by identification switch transistor FET in decision circuit 5.Under the situation of holding wire SL ground short circuit, become Vd=0.
In embodiment 1,2, constitute lamp by the 3 row light-emitting diodes row of respectively 3 light-emitting diodes being connected, but as mentioned above, the lamp that constitutes for the light-emitting diode row by any amount is suitable for all too certainly.In addition, the invention is not restricted to the taillight of embodiment, so long as, in lamps such as Brake lamp, side marker light and headlamp, can both be suitable for the lamp of a plurality of light-emitting components as light source.In addition, it is semiconductor light-emitting elements that the light-emitting component among the present invention is not limited to, and luminous element all can be suitable for equally so long as flow through electric current.
Claims (9)
1. lamp system for vehicle is characterized in that having:
Lamp, this light fixture have illuminating part that a plurality of light-emitting components are connected in parallel and the broken circuit detection circuit that opens circuit that detects described each light-emitting component; And
Decision circuit, it utilizes 1 holding wire to be connected with described broken circuit detection circuit, is used to judge the unusual of light-emitting component,
Its structure is, described broken circuit detection circuit to described holding wire output with detect the corresponding current potential of the light-emitting component that opens circuit, described decision circuit is judged unusual light-emitting component according to the current potential of this holding wire.
2. lamp system for vehicle according to claim 1 is characterized in that,
Described broken circuit detection circuit has a plurality of light-emitting components of detection a plurality of test sections that open circuit that open circuit separately, corresponding to the detection of being undertaken by the test section that respectively opens circuit of opening circuit, exports different current potentials.
3. lamp system for vehicle according to claim 1 and 2 is characterized in that,
Described broken circuit detection circuit has: reference resistance, and it is connected between described holding wire and the 1st current potential; And detection resistance, it does not detect when opening circuit at the described test section that respectively opens circuit, and is connected between described holding wire and the 2nd current potential.
4. lamp system for vehicle according to claim 1 and 2 is characterized in that,
Described broken circuit detection circuit has: reference resistance, and it is connected between described holding wire and the 1st current potential; And detection resistance, it detects when opening circuit at the described test section that respectively opens circuit, and is connected between described holding wire and the 2nd current potential.
5. lamp system for vehicle according to claim 3 is characterized in that,
The resistance value that makes described reference resistance is the low resistance lower than the resistance value of described detection resistance.
6. lamp system for vehicle according to claim 4 is characterized in that,
The resistance value that makes described reference resistance is the low resistance lower than the resistance value of described detection resistance.
7. lamp system for vehicle according to claim 4 is characterized in that,
Described broken circuit detection circuit has the detection resistance that holding wire opens circuit and detects usefulness, and it is connected between described holding wire and described the 2nd current potential, when opening circuit with holding wire or the mode that when the supply power of described illuminating part stops, not flowing through electric current constitute.
8. lamp system for vehicle according to claim 5 is characterized in that,
Described broken circuit detection circuit has the detection resistance that holding wire opens circuit and detects usefulness, and it is connected between described holding wire and described the 2nd current potential, when opening circuit with holding wire or the mode that when the supply power of described illuminating part stops, not flowing through electric current constitute.
9. lamp system for vehicle according to claim 6 is characterized in that,
Described broken circuit detection circuit has the detection resistance that holding wire opens circuit and detects usefulness, and it is connected between described holding wire and described the 2nd current potential, when opening circuit with holding wire or the mode that when the supply power of described illuminating part stops, not flowing through electric current constitute.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2005035470 | 2005-02-14 | ||
| JP2005035470 | 2005-02-14 | ||
| JP2005295225 | 2005-10-07 |
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| CN1822733A true CN1822733A (en) | 2006-08-23 |
| CN100531491C CN100531491C (en) | 2009-08-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200610003115.1A Expired - Fee Related CN100531491C (en) | 2005-02-14 | 2006-02-14 | Lighting system for vehicle |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102452352A (en) * | 2010-10-28 | 2012-05-16 | 比亚迪股份有限公司 | Detection and control circuit of LED (light-emitting diode) steering lamps and detection method thereof |
| CN102470791A (en) * | 2009-09-10 | 2012-05-23 | 三菱电机株式会社 | Headlamp light source lighting device and vehicle headlamp lighting system |
| CN103150984A (en) * | 2011-12-07 | 2013-06-12 | 美格纳半导体有限公司 | Detecting circuit for open of LED array and LED driver apparatus using the same |
| CN101712297B (en) * | 2008-09-30 | 2014-06-11 | 株式会社小糸制作所 | Vehicular lamp |
| CN107105537A (en) * | 2015-12-28 | 2017-08-29 | 株式会社小糸制作所 | Lamp circuit, vehicle turn signal lamp |
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2006
- 2006-02-14 CN CN200610003115.1A patent/CN100531491C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101712297B (en) * | 2008-09-30 | 2014-06-11 | 株式会社小糸制作所 | Vehicular lamp |
| CN102470791A (en) * | 2009-09-10 | 2012-05-23 | 三菱电机株式会社 | Headlamp light source lighting device and vehicle headlamp lighting system |
| CN102470791B (en) * | 2009-09-10 | 2014-05-21 | 三菱电机株式会社 | Headlamp light source lighting device and vehicle headlamp lighting system |
| CN102452352A (en) * | 2010-10-28 | 2012-05-16 | 比亚迪股份有限公司 | Detection and control circuit of LED (light-emitting diode) steering lamps and detection method thereof |
| CN103150984A (en) * | 2011-12-07 | 2013-06-12 | 美格纳半导体有限公司 | Detecting circuit for open of LED array and LED driver apparatus using the same |
| CN103150984B (en) * | 2011-12-07 | 2018-11-13 | 美格纳半导体有限公司 | The detection circuit of open circuit for LED array and use its LED driver equipment |
| CN107105537A (en) * | 2015-12-28 | 2017-08-29 | 株式会社小糸制作所 | Lamp circuit, vehicle turn signal lamp |
| US10081301B2 (en) | 2015-12-28 | 2018-09-25 | Koito Manufacturing Co., Ltd. | Lighting circuit and vehicular turn signal lamp |
| CN107105537B (en) * | 2015-12-28 | 2019-01-18 | 株式会社小糸制作所 | Lamp circuit, vehicle turn signal lamp |
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| Publication number | Publication date |
|---|---|
| CN100531491C (en) | 2009-08-19 |
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