CN101400202A - Apparatus for dynamically and statically monitoring fault of multi-path car lamp - Google Patents
Apparatus for dynamically and statically monitoring fault of multi-path car lamp Download PDFInfo
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- CN101400202A CN101400202A CNA2007100465511A CN200710046551A CN101400202A CN 101400202 A CN101400202 A CN 101400202A CN A2007100465511 A CNA2007100465511 A CN A2007100465511A CN 200710046551 A CN200710046551 A CN 200710046551A CN 101400202 A CN101400202 A CN 101400202A
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Abstract
An apparatus for statically and dynamically monitoring multiplex vehicle lamp faults is composed of a dynamic detection circuit; a static detection circuit; a static and dynamic switching circuit. The dynamic detection circuit includes a detection resistor Rs connected in series between the multiplex vehicle lamp and the power supply in a dynamic monitoring, a voltage-drop Vs formed when a current Is flows through the detection resistor Rs is detected and amplified by a current monitoring device, for example, the current Is reduces for the appearing faults of a vehicle lamp, correspondingly the output voltage V OUT of the current monitoring device reduces, which will be discriminated by the subsequent circuit for lighting up a warning LED; while in the static monitoring, a tiny bias current is provided to a multiplex vehicle lamp by the output terminal of an inverter through a current-limiting resistance, this bias current flows the multiplex vehicle lamp to form a voltage-drop, the voltage-drop rises if fault appears on the vehicle lamp, this rise is amplified by a homophase operational amplifier and then is discriminated by the subsequent circuit for lighting up a warning LED.
Description
Affiliated technical field
But the present invention relates to a kind of device of dynamically and statically monitoring fault of multi-path car lamp.Specifically relating to a kind of can be that the device of monitoring fault of multi-path car lamp simultaneously left under state, the off status by car light in dynamic, static state.
Technical background
At present, some high gear cars have is equipped with the car light fault monitoring device, the existing car light fault monitoring device of certain brand car for example, be two coils of serial connection between two car lights and power supply, two coils are simultaneously on a tongue tube, and two coils around direction opposite, when closing a switch, two car lights are as normally lighting, the size of current of two coils of flowing through equates, direction is opposite, cancel each other in the magnetic field that is produced, the not adhesive of contact of tongue tube is if there is a car light that fault is arranged, a coil no current is flow through, and the magnetic field that electric current produced that another coil is flowed through makes the contact adhesive of tongue tube, and the light-emitting diode that is connected this contact is lighted because of contact adhesive conducting, thereby sends failure warning, know that therefrom existing this disclosed car light fault monitoring device exists the deficiency that can't be monitored under the switch closed condition when static state promptly has fault and two car lights to break down simultaneously.
Summary of the invention
For overcome existing car light fault monitoring device can not static, and the situation that breaks down simultaneously of two car lights under can not be monitored to deficiency.The invention provides a kind of can be car light opening the fault that state, off status can both monitor car light in dynamic, static state, can monitor multi-path car lamp simultaneously, no matter a car light or whole car light breaks down can both monitor.
For reaching above-mentioned purpose, the present invention solves technical scheme that its technical problem adopts and is: by dynamic detection circuit; The Static Detection circuit; Sound attitude commutation circuit; Differentiate display circuit and form a kind of device of dynamically and statically monitoring fault of multi-path car lamp.Contain one in the dynamic detection circuit and detect resistance R s, a current monitoring device INA197, detecting resistance R s is serially connected between power supply and the multi-path car lamp, its resistance is chosen at 0.01 ' Ω-0.03 ' Ω, the 4 pin VIN+ of current monitoring device INA197,5 pin VIN-are connected on two ends that detect resistance R s respectively, when turning on the power switch when promptly being in dynamic monitoring, electric current I s lights multi-path car lamp by detecting resistance R s, electric current I s flows through the pressure drop Vs that will form when detecting resistance R s, the magnitude of voltage of pressure drop Vs is very little, be generally less than 50mV, this can the extra circuits power consumption, and pressure drop Vs is by the 4 pin VIN+ of current monitoring device INA197,5 pin VIN-detect, after 50 times of current monitoring device INA197 amplifications, by 1 pin OUT output, the voltage V of 1 pin OUT output
OUT=Rs.Is.50, promptly after detecting resistance R s resistance and determining, the voltage V of the output of current monitoring device INA197
OUTWith the proportional relation of electric current I s, therefore, if any a car light or all car light break down and cause that electric current I s reduces or becomes zero, the voltage V of the output of current monitoring device INA197
OUTAlso corresponding step-down or change zero, V
OUTThis change meeting of voltage is differentiated out by subsequent conditioning circuit.Contain an operational amplifier in the Static Detection circuit, three resistance, element constitutes a homophase operational amplification circuit thus, its input is connected with an end of multi-path car lamp, its output links to each other with the normal phase input end of quiescent voltage comparator, when the powered-down switch promptly is in static monitoring, output by the inverter in the sound attitude commutation circuit provides a very little bias current through a current-limiting resistance for multi-path car lamp, when flowing through multi-path car lamp, this bias current can form step-down, when one or all car light break down and will cause that pressure drop raises, the rising of this pressure drop can be differentiated out after the homophase operational amplifier amplifies by subsequent conditioning circuit.Contain an inverter in the sound attitude commutation circuit, two diodes, two resistance, the input of inverter respectively with an end of switch, one end of a resistance connects, the other end ground connection of this resistance, the output of inverter respectively with the positive pole of a diode, the negative pole of another diode, one end of a current-limiting resistance connects, the negative pole of described this class diode links to each other with the inverting input of dynamic electric voltage comparator, the positive pole of another diode is connected with the normal phase input end of quiescent voltage comparator, and the other end of current-limiting resistance links to each other with an end of multi-path car lamp.When turning on the power switch when promptly being in the dynamic monitoring state, the input of inverter is a high level, is output as low level, and the low level of output is pulled to low level to the normal phase input end of quiescent voltage comparator by diode, make its output can only output low level, both allowed the Static Detection circuit malfunction.The output of inverter is because of being low level, when the powered-down switch promptly is in static monitoring state, the input of inverter is a low level, output is a high level, the high level of output is elevated to the inverting input of dynamic electric voltage comparator near supply voltage by diode, make its output can only output low level, both allowed dynamic detection circuit lose efficacy, the output of inverter provides a small bias current through current-limiting resistance for multi-path car lamp simultaneously.Differentiate in the display circuit and contain two voltage comparators, one is the dynamic electric voltage comparator, and one is the quiescent voltage comparator, when at the dynamic monitoring state, and as the car light fault-free, the voltage V of the output of current monitoring device INA197
OUTThe voltage that is added in dynamic electric voltage comparator inverting input is higher than reference voltage, its comparator output low level, it is normal that the green LED conducting is lighted to show, if any one or whole break down voltage V of the output that causes current monitoring device INA197 of car light
OUTCorresponding step-down or become zero and make the voltage of the inverting input of comparator be lower than reference voltage, its comparator output high level ends green LED and does not work, and red light emitting diodes must conduct and lighted, thus send failure warning.When at static monitoring state, as the car light fault-free, the voltage of the normal phase input end of quiescent voltage comparator is lower than reference voltage, its output output low level, red light emitting diodes does not work because of there being electricity, as one or all car light break down and cause that the car light pressure drop raises, after amplifying, amplifier make the voltage of the normal phase input end of quiescent voltage comparator be higher than reference voltage, its output output high level must conduct red light emitting diodes and is lighted, thereby sends caution.Differentiate in the display circuit and also contain two light-emitting diodes, one is green, is used for normal demonstration, and another is red, is used for failure warning.
The invention has the beneficial effects as follows: can be car light opening the fault that state, off status can both monitor car light in dynamic, static state, can monitor multi-path car lamp simultaneously, no matter a car light or whole car light breaks down can both monitor.
Description of drawings
Accompanying drawing is the circuit theory diagrams of the device of a kind of dynamically and statically monitoring fault of multi-path car lamp of the present invention,
Embodiment
With reference to accompanying drawing, to tell specific embodiments of the present invention in detail, dynamic detection circuit 1 has been shown in the accompanying drawing, Static Detection circuit 2, sound attitude commutation circuit 3 is differentiated display circuit 4, power supply 5, switch 6 detects resistance 7, current monitoring device INA197 8, operational amplifier 11, dynamic electric voltage comparator 22, quiescent voltage comparator 27, inverter 19, car light 14,15,16,17, diode 18,20,28,29, light-emitting diode 26,32, the annexation of resistance 9,10,12,13,21,23,24,25,30,31,33.
Detect resistance R s7 in the accompanying drawings and be serially connected in switch 6 and car light 14,15,16, between 17,4 pin VIN+ of INA197 current monitoring device 8,5 pin VIN-are connected on two ends that detect resistance R s7 respectively, 3 pin V+ connect power supply 5,2 pin GND ground connection, 1 pin OUT links to each other with the inverting input of dynamic electric voltage comparator 22, operational amplifier 11 and resistance 10,12,13 constitute a homophase operational amplifier, its input and car light 14,15,16, an end of 17 connects, output is connected with the normal phase input end of quiescent voltage comparator 27, car light 14,15,16,17 other end ground connection.The input of inverter 19 is connected with resistance 33 with an end of switch 6 respectively, the other end ground connection of resistance 33, the output of inverter 19 is connected with the positive pole of diode 18, the negative pole of diode 20, an end of resistance 10 respectively, the negative pole of diode 18 links to each other with the inverting input of dynamic electric voltage comparator 22, the positive pole of diode 20 links to each other with the normal phase input end of quiescent voltage comparator 27, and the other end of resistance 9 is connected with an end of car light 14,15,16,17. Resistance 21,23 are serially connected between power supply 5 and the ground wire, resistance 21, the voltage of 23 junction is the reference voltage of dynamic comparer 22 and is connected with its normal phase input end, resistance 24,30 are serially connected between power supply 5 and the ground wire, resistance 24, the voltage of 30 junction is the reference voltage of static comparator and is connected with its inverting input, green LED positive pole 26 links to each other with an end of switch 6 through resistance 25, negative pole connects the output of dynamic electric voltage comparator 22, the positive pole of red light emitting diodes 32 through resistance 31 respectively with diode 28,29 negative pole connects, diode 28,29 positive pole respectively with sound attitude voltage comparator 22,27 output connects.The minus earth of red light emitting diodes 32.
The principle of device of a kind of dynamically and statically monitoring fault of multi-path car lamp of the present invention is: turn on the power switch 6, be in the dynamic monitoring state, during fault-free, the pressure drop that detects resistance 7 is added in the inverting input of dynamic electric voltage comparator 22 after current monitoring device INA197 amplifies 50 times, this voltage is set at the reference voltage that is higher than comparator, so the output of dynamic electric voltage comparator 22 is a low level, green LED 26 conductings are lighted to show normal, when fault is arranged, detect resistance 7 electric currents and reduce the pressure drop step-down, current monitoring device INA197 output end voltage is step-down thereupon also, make the voltage of the inverting input that is added in dynamic electric voltage comparator 22 be lower than reference voltage, so the output of comparator uprises level by low level, green LED anodal 26 is by not working, red light emitting diodes 31 must conduct to be lighted and is sent failure warning, powered-down switch 6, be in static monitoring state, during fault-free, output by inverter 19 is a car light 14 after resistance 9 current limlitings, 15,16,17 provide a Weak current, this Weak current can form pressure drop at the car light place, after amplifying by the homophase operational amplifier, this step-down is added in the normal phase input end of quiescent voltage comparator 27, this voltage is set at when fault-free and is lower than reference voltage, so the output of comparator 22 is a low level, red light emitting diodes positive pole 31 does not work because of there being electricity, when fault is arranged, the car light pressure drop raises, by being added in the normal phase input end of quiescent voltage comparator 27 after the amplification of homophase operational amplifier, this voltage is because of being higher than reference voltage, so the output of comparator 27 uprises level by low level, red light emitting diodes positive pole 31 must conduct to be lighted and sends failure warning.Sound attitude commutation circuit is under the dynamic monitoring state, the output of inverter 19 is low level, this low level is pulled to low level to the voltage of the normal phase input end of quiescent voltage comparator 27, make its output can not export high level, promptly allow Static Detection circuit 4 lose efficacy, sound attitude commutation circuit is under static monitoring state, the output of inverter 19 is high level, this high level is elevated to the voltage of the inverting input of dynamic electric voltage comparator 27 near supply voltage, make its output can not export high level, promptly allow dynamic detection circuit 1 lose efficacy, the high level of the output of inverter 19 provides a small bias current for car light simultaneously.
Claims (3)
- The device of 1 one kinds of dynamically and statically monitoring fault of multi-path car lamp is by dynamic detection circuit (1), Static Detection circuit (2), sound attitude commutation circuit (3), differentiating display circuit (4) forms, it is characterized in that: the detection resistance R s (7) in the dynamic detection circuit (1) is serially connected in switch (6) and car light (14), (15), (16), (17) between, 4 pin VIN+ of INA197 current monitoring device (8), 5 pin VIN-are connected on two ends that detect resistance R s (7) respectively, 3 pin V+ connect power supply (5), 2 pin GND ground connection, 1 pin OUT links to each other with the inverting input of dynamic electric voltage comparator (22).
- 2, to choose at 0.01 Ω-0.03 Ω according to the resistance of claims 1 described resistance R s (7), the pressure drop of resistance R s (7) should be less than 50mV.
- 3, according to claims 1 described INA197 current monitoring device (8) output voltage V OUT=Rs.Is.50, promptly after detecting resistance R s (7) resistance and determining, the voltage V of the output of current monitoring device INA197 OUTWith the proportional relation of electric current I s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100465511A CN101400202A (en) | 2007-09-28 | 2007-09-28 | Apparatus for dynamically and statically monitoring fault of multi-path car lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100465511A CN101400202A (en) | 2007-09-28 | 2007-09-28 | Apparatus for dynamically and statically monitoring fault of multi-path car lamp |
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| Publication Number | Publication Date |
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| CN101400202A true CN101400202A (en) | 2009-04-01 |
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| CNA2007100465511A Pending CN101400202A (en) | 2007-09-28 | 2007-09-28 | Apparatus for dynamically and statically monitoring fault of multi-path car lamp |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793319A (en) * | 2016-12-30 | 2017-05-31 | 上海小糸车灯有限公司 | A kind of LED failure cut-off method that can reduce quiescent current |
| CN110225614A (en) * | 2019-03-19 | 2019-09-10 | 生迪智慧科技有限公司 | The fault detection means and system of lamp control system |
| CN110231560A (en) * | 2018-03-06 | 2019-09-13 | 欧姆龙汽车电子株式会社 | Inductive load controls equipment |
| CN110979182A (en) * | 2019-12-24 | 2020-04-10 | 东风电子科技股份有限公司 | Vehicle lamp fault diagnosis method |
| CN113376517A (en) * | 2021-07-14 | 2021-09-10 | 广州创锐车用电器有限公司 | Leakage detection circuit of handle switch and handle switch |
-
2007
- 2007-09-28 CN CNA2007100465511A patent/CN101400202A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106793319A (en) * | 2016-12-30 | 2017-05-31 | 上海小糸车灯有限公司 | A kind of LED failure cut-off method that can reduce quiescent current |
| CN106793319B (en) * | 2016-12-30 | 2019-04-09 | 上海小糸车灯有限公司 | A kind of LED failure cut-off method that can reduce quiescent current |
| CN110231560A (en) * | 2018-03-06 | 2019-09-13 | 欧姆龙汽车电子株式会社 | Inductive load controls equipment |
| CN110231560B (en) * | 2018-03-06 | 2023-03-14 | 欧姆龙汽车电子株式会社 | Inductive load control device |
| CN110225614A (en) * | 2019-03-19 | 2019-09-10 | 生迪智慧科技有限公司 | The fault detection means and system of lamp control system |
| CN110979182A (en) * | 2019-12-24 | 2020-04-10 | 东风电子科技股份有限公司 | Vehicle lamp fault diagnosis method |
| CN110979182B (en) * | 2019-12-24 | 2023-03-10 | 东风电子科技股份有限公司 | Vehicle lamp fault diagnosis method |
| CN113376517A (en) * | 2021-07-14 | 2021-09-10 | 广州创锐车用电器有限公司 | Leakage detection circuit of handle switch and handle switch |
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Open date: 20090401 |