CN100421993C - Driving circuit for light emitting device in vehicle - Google Patents
Driving circuit for light emitting device in vehicle Download PDFInfo
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- CN100421993C CN100421993C CNB2005100631692A CN200510063169A CN100421993C CN 100421993 C CN100421993 C CN 100421993C CN B2005100631692 A CNB2005100631692 A CN B2005100631692A CN 200510063169 A CN200510063169 A CN 200510063169A CN 100421993 C CN100421993 C CN 100421993C
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- light emitting
- vehicle
- power supply
- driving circuit
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Abstract
The present invention relates to a driving circuit for a light emitting device in a vehicle. The driving circuit for a light emitting device in a vehicle is mainly formed by that after a plurality of light emitting diodes are connected in series, the light emitting diodes and a power supply circuit form a power supply loop to be driven and lightened, wherein after the power supply circuit stabilizes the voltage of a power supply in a vehicle, the power supply circuit boosts the voltage of a stabilized voltage power supply by a step-up power supply switching circuit to provide a sufficient and stable direct current drive power supply for a lamp string so as to reduce the damaged opportunity of the light emitting diodes. Because a plurality of light emitting diodes are connected in series, when any light emitting diode is in open circuit, the lamp string can be totally extinguished and can no longer be lightened; thus, when a driver activates a vehicle, the driving circuit for a light emitting device in a vehicle reminds the driver of clearly judging that an illuminating device is damaged and is needed to be replaced instantly to ensure driving safety.
Description
Technical field
The invention relates to a kind of driving circuit of automobile-used light-emitting device, refer to a kind of driving circuit that arbitrary light-emitting diode damages in the real-time response light-emitting device that has especially, the prompting steerman new light-emitting diode that changes the outfit is as early as possible avoided causing danger because light weakens.
Background technology
Because the technical development of light-emitting diode rapidly and stable, has been widely applied in illumination with on the device, except enough lighting source can be provided, bulb had less electricity consumption more in the past.
The illumination of vehicle or caution all are to use battery power in the car with lamp, so after the illumination equipment of light-emitting diode came out, depot also used illumination or the caution lamp of these light-emitting diodes as vehicle in a large number.Just the illumination equipment that is applied on the vehicle at present be it seems, because the power supply signal when vehicle opens and closes is also unstable, therefore the design of its driving circuit and a plurality of light-emitting diodes is adopted parallel way for it more, announce shown in the illumination equipment that No. 212375 " multi-purpose vehicle(MPV) car plate illumination equipment " utility model patent case disclose (as shown in Figure 3) as TaiWan, China, its driving circuit consists predominantly of an oscillator U1, two-transistor Q1, Q2 and a plurality of diode (LED), wherein a plurality of diode (LED)s are that the hot end that is connected in parallel in direct supply reaches the wherein collector terminal of a transistor Q1, and transistor Q1 is driven by this oscillator U1 and control its ON time, anticipate promptly, a plurality of light-emitting diodes LED cognition are lighted along with the conducting of transistor Q1.
TaiWan, China is announced No. 479839 " light emitting diode bulb " utility model patent case (as shown in Figure 4) for another example, it is a kind of bulb that uses source of AC, it makes a plurality of diodes adopt parallel way to be connected with electric power loop equally, so, when wherein a lamp string 11 was opened a way, remaining lamp string 11 still can be lighted in conducting.
By above-mentioned LED driving circuit design of lifting as can be known, adopt the design that is connected in parallel between its light-emitting diode and the driving circuit mostly, can't use to avoid arbitrary light-emitting diode to damage open circuit.But, then have its shortcoming when the illumination equipment of these light-emitting diodes is located on the vehicle.Mainly be because when wherein having partly luminous disome to damage, though all the other light-emitting diodes still can be lighted, but the overall brightness of illumination equipment can lower, and general steerman can't find difference usually, and the continuation driving vehicle, yet weakening of Vehicular warning lamp brightness is undoubtedly a major challenge to vehicle safety.
Summary of the invention
For this reason, main purpose of the present invention provides a kind of driving circuit of automobile-used light-emitting device, when making the arbitrary damage of a plurality of light-emitting diodes, illumination equipment is extinguished no longer light, and sets out on a journey after reminding steerman maintenance in real time or changing illumination equipment again.
Desiring to reach the employed major technique means of above-mentioned purpose is to make this driving circuit include:
One lamp string is that a plurality of light-emitting diode series connection connect;
One step rose power-switching circuit, and its power output end is to connect for these lamp string two ends, so that this lamp string direct supply to be provided; And
One mu balanced circuit, its input end are connected to direct supply in the car, and its voltage output end then is connected to the input end that this step rises power-switching circuit;
Wherein, this step rises power-switching circuit and consists predominantly of:
One step rose conv, but it mainly is made up of a transistor, the wide oscillator of a harmonic and a comparator, but this transistorized base terminal is the pulse wave signal mouth that is connected to the wide oscillator of this harmonic, but the mouth of this comparator then is the defeated oscillation frequency of the wide oscillator of this harmonic of control, wherein a wherein input end of this comparator is the mouth that is connected to mu balanced circuit, to obtain a stable reference voltage level;
One boost inductor, the one end is connected to the high potential of this mu balanced circuit output voltage, and the other end then is to be connected to the transistorized collector terminal that this step rises conv; And
One filter capacitor, be to be connected to this boost inductor, the counter potential that produces with the moment that boost inductor is ended along with transistor is converted to the galvanic current pressure, this filter capacitor is this step and rises the mouth of power-switching circuit, and another input end that this step rises the comparator of conv is to see through a Zener diode to be connected to mouth.
The generation of instantaneous pressure signal is arranged along with the keying of vehicle owing to dc power signal in the car, and withstand voltage this high-voltage signal that can't bear of general light-emitting diode, be with, power supply processing circuit of the present invention is via a mu balanced circuit dc power signal in the car to be given fixedly vdc of voltage stabilizing output one earlier, look the quantity of lamp light-emitting diode that string is connected again, determine this step to rise the output voltage of power-switching circuit, that is, it is that vdc with this mu balanced circuit boosts to a suitable voltage that step rises power-switching circuit, lights with driving lamp string.Lamp string of the present invention must constitute the loop circuit with the mouth that this step rise power-switching circuit, just can be driven and light, because the lamp string is to be connected in series by a plurality of light-emitting diodes to form, so wherein during a light-emitting diode open-circuit, then can open a way and can't light in this loop circuit.So, when steerman activates vehicle, can confirm clearly promptly whether this illumination equipment damages, and keep in repair at once, guarantee traffic safety.
Description of drawings
Fig. 1: the circuit diagram that is the present invention's one preferred embodiments.
Fig. 2: the detailed circuit diagram that is Fig. 1 of the present invention.
Fig. 3: first figure that is No. 212375 " multi-purpose vehicle(MPV) car plate illumination equipment " utility model patent case of bulletin.
Fig. 4: the 3rd figure that is No. 479839 " light emitting diode bulb " utility model patent case of bulletin.
In the accompanying drawing:
10--driving circuit 11--lamp string
The 12--step rises power-switching circuit
The 121--step rises conv 122--boost inductor
123--filter capacitor 124--schottky diode
13--mu balanced circuit 131--coupling capacitance
The specific embodiment
The present invention is primarily aimed at the improvement of car lighting with a kind of driving circuit that lamp provided, and at first sees also shown in Figure 1ly, is the preferred embodiment for driving circuit 10 of the present invention, and it includes:
One lamp string 11 is that a plurality of light-emitting diode D2 ~ D9 are connected in series;
One step rose power-switching circuit 12, and its power output end is to connect for these lamp string 11 two ends, so that this lamp string direct supply to be provided; And
One mu balanced circuit 13, its input end are connected to direct supply DC12V in the car, and its voltage output end then is connected to the input end that this step rises power-switching circuit 12.
Please cooperate again and consult shown in Figure 2ly, the above-mentioned step rises power-switching circuit 12 and consists predominantly of:
One step rose conv 121, but it mainly is made up of a transistor Q1, the wide oscillator OSC of a harmonic and a comparator C OMP, but the base terminal of this transistor Q1 is the pulse wave signal mouth that is connected to the wide oscillator OSC of this harmonic, but the mouth of this comparator C OMP then is the oscillation frequency of the wide oscillator OSC output of this harmonic of control, wherein the wherein input end of this comparator C OMP is the mouth that is connected to mu balanced circuit 13, to obtain a stable reference voltage level;
One boost inductor 122, one end are connected to the high potential of these mu balanced circuit 13 output voltages, and the other end then is to be connected to the collector terminal that this step rises the transistor Q1 of conv 121; And
One filter capacitor 123, be to be connected to this boost inductor 122, the counter electromotive force that produces with the moment that boost inductor 122 is ended along with transistor Q1 is converted to the galvanic current pressure, these filter capacitor 123 output nodes are this step and rise the mouth of power-switching circuit 12, again, another input end that this step rises the comparator C OMP of conv 121 is can see through a Zener diode ZD1 to be connected to mouth, when avoiding lamp string 11 open circuit, this step rises conv 121 and can unrestrictedly improve output voltage values.Again, this boost inductor 122 can see through one forward schottky diode 124 be connected to this filter capacitor 123.
It is to give the step when rising conv 121 and boost inductor 122 when mu balanced circuit 13 output stable DC voltages that the above-mentioned step rises power-switching circuit 12, this step rises conv 121 and can export pulse wave signal, to determine the current flowing time of this boost inductor 122, so can control the charging voltage value of filter capacitor 123, and the magnitude of voltage of control output.If to export 30 volts of voltages, the present invention can drive lamp string 11 or 7-8 the lamp string 11 that white light-emitting diode is in series that is in series by 12-15 red light emitting diodes approximately.
Again, above-mentioned mu balanced circuit 13 is mainly to be made up of a voltage stabilizing IC (U1), switches moment because the aforementioned step rises the transistor Q1 of power supply changeover device 12 in conduction and cut-off, and surging can appear in supply current, for eliminating this surging phenomenon, can be in this voltage stabilizing IC (U1) input end coupling capacitance 131 in parallel.
As shown in the above description, the present invention is applied on the lighting apparatus for vehicle, because a plurality of light-emitting diodes adopt and are connected in series, when wherein an optical diode is opened a way, this lamp string promptly can extinguish not to be lighted, so, and when steerman finds that illumination equipment or Warning light device do not work after activating vehicle, promptly need keep in repair, to safeguard traffic safety.Again, because driving circuit of the present invention is to take Vehicle Power, and the stability of Vehicle Power is not good, and therefore, the present invention is that design one mu balanced circuit is to stablize power supply on vehicle for the stabilized driving power supply is provided.And the present invention is because of adopting Series lamp string, so need higher voltage drives lamp string, because the demand difference of different illumination equipments or alarming device brightness, so for elasticity adjusting output voltage, the present invention promptly adopts the step to rise power-switching circuit, adjust its driving frequency to look lamp string driving voltage, suitable and stable driving voltage is provided.
Claims (4)
1. the driving circuit of an automobile-used light-emitting device is characterized in that, is to include:
One lamp string is that a plurality of light-emitting diode series connection connect;
One step rose power-switching circuit, and its power output end is to connect for these lamp string two ends, so that this lamp string direct supply to be provided; And
One mu balanced circuit, its input end are connected to direct supply in the car, and its voltage output end then is connected to the input end that this step rises power-switching circuit;
Wherein, this step rises power-switching circuit and consists predominantly of:
One step rose conv, but it mainly is made up of a transistor, the wide oscillator of a harmonic and a comparator, but this transistorized base terminal is the pulse wave signal mouth that is connected to the wide oscillator of this harmonic, but the mouth of this comparator then is the defeated oscillation frequency of the wide oscillator of this harmonic of control, wherein a wherein input end of this comparator is the mouth that is connected to mu balanced circuit, to obtain a stable reference voltage level;
One boost inductor, the one end is connected to the high potential of this mu balanced circuit output voltage, and the other end then is to be connected to the transistorized collector terminal that this step rises conv; And
One filter capacitor, be to be connected to this boost inductor, the counter potential that produces with the moment that boost inductor is ended along with transistor is converted to the galvanic current pressure, this filter capacitor is this step and rises the mouth of power-switching circuit, and another input end that this step rises the comparator of conv is to see through a Zener diode to be connected to mouth.Together
2. the driving circuit of automobile-used light-emitting device as claimed in claim 1 is characterized in that, this boost inductor see through one forward schottky diode be connected to this filter capacitor.
3. the driving circuit of automobile-used light-emitting device as claimed in claim 1 or 2 is characterized in that, this mu balanced circuit is mainly to be made up of a voltage stabilizing IC.
4. the driving circuit of automobile-used light-emitting device as claimed in claim 3 is characterized in that, this voltage stabilizing IC input end is a coupling capacitance in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100631692A CN100421993C (en) | 2005-04-05 | 2005-04-05 | Driving circuit for light emitting device in vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100631692A CN100421993C (en) | 2005-04-05 | 2005-04-05 | Driving circuit for light emitting device in vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1847054A CN1847054A (en) | 2006-10-18 |
| CN100421993C true CN100421993C (en) | 2008-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100631692A Expired - Fee Related CN100421993C (en) | 2005-04-05 | 2005-04-05 | Driving circuit for light emitting device in vehicle |
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| CN (1) | CN100421993C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101340765B (en) * | 2007-07-03 | 2011-07-06 | 骆彦铭 | Control circuit of LED rear-view mirror |
| CA2837256C (en) * | 2011-05-25 | 2017-06-20 | Xiuhong Zhang | Decorative lighting supplied by battery-boost |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06297764A (en) * | 1993-04-12 | 1994-10-25 | Oki Electric Ind Co Ltd | Drive circuit of light emitting element array |
| US5440304A (en) * | 1992-07-27 | 1995-08-08 | Rohm Co., Ltd. | Integrated circuit having a shift stage count changing function |
| US6255786B1 (en) * | 2000-04-19 | 2001-07-03 | George Yen | Light emitting diode lighting device |
| JP2002008409A (en) * | 2000-06-19 | 2002-01-11 | Toshiba Lighting & Technology Corp | Led light source device |
| CN2472452Y (en) * | 2001-02-28 | 2002-01-16 | 戴年生 | High performance and cheap emergent lamp for fire control |
| US20020021573A1 (en) * | 2000-05-03 | 2002-02-21 | Zhang Evan Y. W. | Lighting devices using LEDs |
| US20020085378A1 (en) * | 2001-01-04 | 2002-07-04 | Chun-Teng Lee | Connected light bulbs for water-tube light decoration |
| JP2002343587A (en) * | 2001-05-18 | 2002-11-29 | Toa Corp | Lighting circuit for light-emitting diode and lighting method of light-emitting diode |
-
2005
- 2005-04-05 CN CNB2005100631692A patent/CN100421993C/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5440304A (en) * | 1992-07-27 | 1995-08-08 | Rohm Co., Ltd. | Integrated circuit having a shift stage count changing function |
| JPH06297764A (en) * | 1993-04-12 | 1994-10-25 | Oki Electric Ind Co Ltd | Drive circuit of light emitting element array |
| US6255786B1 (en) * | 2000-04-19 | 2001-07-03 | George Yen | Light emitting diode lighting device |
| US20020021573A1 (en) * | 2000-05-03 | 2002-02-21 | Zhang Evan Y. W. | Lighting devices using LEDs |
| JP2002008409A (en) * | 2000-06-19 | 2002-01-11 | Toshiba Lighting & Technology Corp | Led light source device |
| US20020085378A1 (en) * | 2001-01-04 | 2002-07-04 | Chun-Teng Lee | Connected light bulbs for water-tube light decoration |
| CN2472452Y (en) * | 2001-02-28 | 2002-01-16 | 戴年生 | High performance and cheap emergent lamp for fire control |
| JP2002343587A (en) * | 2001-05-18 | 2002-11-29 | Toa Corp | Lighting circuit for light-emitting diode and lighting method of light-emitting diode |
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| Publication number | Publication date |
|---|---|
| CN1847054A (en) | 2006-10-18 |
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