CN111942271B - Safety circuit for car lamp and control method thereof - Google Patents
Safety circuit for car lamp and control method thereof Download PDFInfo
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- CN111942271B CN111942271B CN201910399172.3A CN201910399172A CN111942271B CN 111942271 B CN111942271 B CN 111942271B CN 201910399172 A CN201910399172 A CN 201910399172A CN 111942271 B CN111942271 B CN 111942271B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
- B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
Abstract
The invention provides a safety circuit for a vehicle lamp and a control method thereof. The system comprises a driving module and an application module connected with the driving module; the driving module comprises a microprocessor, a DC/DC converter and an analog-to-digital converter which are respectively connected to the microprocessor; the application module comprises an application unit and a protection unit, wherein the application unit is connected with the DC/DC converter, the protection unit is connected with the analog-to-digital converter, and a safety configuration resistor is further arranged in the application module and connected with the analog-to-digital converter. According to the safety circuit and the control method thereof provided by the invention, when a protection unit and the like in the car lamp system are damaged, the corresponding safety current can be selected according to the functional safety configuration resistor, so that the safety of a vehicle can be effectively ensured, and the effective running of the car lamp can be ensured.
Description
Technical Field
The invention relates to the technical field of automobile spare and accessory parts, in particular to a safety circuit for a car lamp and a control method thereof.
Background
With the rapid development of the automobile industry, the complexity of each system in the automobile is continuously increased, and the requirement on the functional safety of the system is higher and higher. The automobile lamp is used as a lighting tool, needs a certain current to ensure normal work, and meanwhile, heat generation and the like in the working process threaten the safety of a circuit of the automobile lamp. In a current lamp system of a vehicle, a temperature sensor, an operating current configuration resistor, and the like are generally provided to ensure safety of the lamp system. However, in such a design, when the temperature sensor or the operating current configuration resistor itself is damaged and cannot provide an accurate safety index, if the vehicle lamp system continues to operate according to the original operating current under the condition that the circuit safety cannot be determined, the vehicle lamp system will be damaged or cannot operate normally, and the normal operation of the vehicle will not be guaranteed.
Disclosure of Invention
In order to solve the above problems, the present invention provides a safety circuit for a vehicle lamp and a control method thereof. According to the safety circuit and the control method thereof provided by the invention, when a temperature sensor, a working current configuration resistor and the like in a car lamp system are damaged, the corresponding safety current can be selected according to the functional safety configuration resistor, and when the resistance value of the functional safety configuration resistor is not in a normal range, the minimum current for ensuring the car lamp to be turned on is provided according to a default value, so that the safety of a vehicle can be effectively ensured, and the effective operation of the car lamp is ensured.
Specifically, the invention provides a safety circuit for a vehicle lamp, which comprises a driving module and an application module connected with the driving module; the driving module comprises a microprocessor, a DC/DC converter and an analog-to-digital converter, wherein the DC/DC converter and the analog-to-digital converter are respectively connected to the microprocessor, and the DC/DC converter is connected with an external power supply; the application module comprises an application unit and a protection unit, wherein the application unit is connected with the DC/DC converter, the protection unit is connected with the analog-to-digital converter, and a safety configuration resistor is further arranged in the application module and connected with the analog-to-digital converter.
Preferably, in the above safety circuit, a signal adjusting unit is further disposed in the driving module, and the signal adjusting unit is disposed in a circuit between the safety configuration resistor and the analog-to-digital converter.
Preferably, in the above safety circuit, the driving module further includes a reference power supply, and the reference power supply is connected to the safety configuration resistor.
Preferably, in the above safety circuit, the driving module further includes a resistor and/or a capacitor, and the resistor and/or the capacitor is disposed in a circuit in which the reference power supply is connected to the safety configuration resistor.
Preferably, in the above safety circuit, the protection unit includes an operating current configuration resistor and/or a temperature sensor.
In another aspect of the present invention, there is provided a control method of a safety circuit for a vehicle lamp, including the steps of a microprocessor receiving operation data of a protection unit in an application module through an analog-to-digital converter; when the operation data of at least one protection device in the protection unit exceeds the normal operation data, reading the resistance value of the safety configuration resistor through an analog-to-digital converter; when the resistance value of the safety configuration resistor meets the normal working resistance value, a first control instruction is sent to the DC/DC converter according to the resistance value of the safety configuration resistor, and the DC/DC converter distributes a first working current to the application unit according to the first control instruction; and when the resistance value of the safety configuration resistor exceeds the normal working resistance value range, reading a default safety resistance value, sending a second control instruction to the DC/DC converter according to the default safety resistance value, and distributing a second working current to the application unit by the DC/DC converter according to the second control instruction.
Preferably, in the above control method, a signal adjusting unit is further disposed in the driving module, and the signal adjusting unit is disposed in a circuit between the safety configuration resistor and the analog-to-digital converter and is used for adjusting a voltage signal in the circuit.
Preferably, in the control method, the driving module further includes a reference power supply, and the reference power supply is connected to the safety configuration resistor and is configured to provide a reference voltage to the safety configuration resistor and measure a resistance value of the safety configuration resistor.
Preferably, in the above control method, the driving module further includes a resistor and/or a resistor-capacitor, and the resistor and/or the resistor-capacitor is disposed in a circuit where the reference power supply is connected to the safety configuration resistor, and is used for adjusting a voltage value in the circuit.
Preferably, in the above control method, the protection unit includes a working current configuration resistor and a temperature sensor, the working current configuration resistor is used to adjust a voltage value in a working circuit in the application module, and the temperature sensor is used to obtain a temperature value in the working circuit in the application module.
Compared with the prior art, the invention has the advantages that:
1) The safety configuration resistor is additionally arranged in the light driving circuit, and the minimum working current of the circuit is determined through the resistance value of the safety configuration resistor, so that the safe and normal work of the car light is ensured, and effective lighting or functional light is provided;
2) Meanwhile, a default safety resistance value is also set, and when the safety configuration resistor also breaks down, the working current of the circuit can be determined according to the default safety resistance value, so that the safety and normal work of the car lamp circuit can be more effectively guaranteed;
3) The invention adopts the resistor separated from the driving module to configure the functional safety current, and can design the application circuit on the application module only according to the preset ohmmeter under the condition of not changing the software and hardware bodies of the driving module, thereby avoiding the requirement of increasing the variety of the driving module according to different conditions.
Drawings
FIG. 1 is a schematic diagram of a safety circuit for a vehicle lamp according to a preferred embodiment of the present invention;
fig. 2 is a flow chart illustrating a control method of a safety circuit for a vehicle lamp according to a preferred embodiment of the present invention.
Detailed Description
The advantages of the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic structural diagram of a safety circuit for a vehicle lamp according to a preferred embodiment of the present invention. As can be seen from the figure, the safety circuit provided in this embodiment mainly includes the following modules or units: the driving module is connected with the application module and provides electric energy and/or driving signals and the like for the application module to control the application module to work. For example, when the application module includes a lighting unit, such as an LED, the driving module provides power to the application module according to the operating requirement of the LED, so as to control the LED in the application module to operate normally.
Specifically, the driving module includes a Microprocessor (MCU), and a DC/DC converter and an analog-to-digital converter (ADC) respectively connected to the MCU, and the DC/DC converter is connected to an external power source, so as to convert the power supplied from the external power source into a required current output, and the ADC is configured to convert the obtained electrical signal into a digital signal that can be processed by the microprocessor for the microprocessor to use; the application module includes an application unit and a protection unit. The application unit is a structural unit capable of realizing a certain application function, such as an LED, and the application unit can realize a lighting function; the protection unit is a structural unit for ensuring safe operation of a circuit on the application module, such as a temperature sensor for acquiring a temperature value in a working circuit on the application module, a working current configuration resistor for adjusting an electrical signal such as a voltage value in the working circuit on the application module, and the like. In this embodiment, an application unit in an application module is connected to a DC/DC converter in a driving module, and the DC/DC converter supplies the converted current to the application unit for use; the protection unit in the application module is connected with the analog-to-digital converter in the driving module, the analog-to-digital converter acquires the electric signal on the protection unit, converts the electric signal into a digital signal and transmits the digital signal to the microprocessor, and the microprocessor judges whether the circuit in the application module is in a safe working state or not according to the digital signal. In this embodiment, a safety configuration resistor is further set in the application module, and the safety configuration resistor is connected to the analog-to-digital converter, where the configuration is that, when the microprocessor detects that at least one specific protection device in the protection unit fails through a digital signal representing an electrical signal on the protection unit, which is obtained by the analog-to-digital converter, the microprocessor controls the analog-to-digital converter to obtain the electrical signal, such as a voltage signal, a current signal, a resistance signal, etc., on the safety configuration resistor, converts the electrical signal into the digital signal and transmits the digital signal to the microprocessor, the microprocessor determines a safety current value or a safety voltage value, etc., according to the digital signal, and controls the DC/DC converter to convert the received external voltage or current into the safety current value or the safety voltage value, which is provided to the application unit, so that the application unit can perform effective work.
In a more preferred embodiment of the present invention, in order to more effectively prevent the unit device for protection, when the application module itself includes a safety configuration resistor and the like is damaged, the application module cannot obtain a working current with safety guarantee, thereby causing damage to a circuit thereon or failing to realize effective operation, in this embodiment, a default safety resistor is further stored in the microprocessor, so that, as in the above embodiment, when the microprocessor judges that the safety configuration resistor is not within a resistance value range of normal operation thereof according to a received digital signal from the safety configuration resistor, the microprocessor reads the stored default safety resistor, determines a safety current value or a safety voltage value and the like under the condition according to the resistor, and controls the DC/DC converter to convert the received external voltage or current into the safety current value or the safety voltage value and provide the safety current value or the safety voltage value to the application unit, thereby effectively operating the application unit. Therefore, according to the arrangement of the embodiment, the application unit can be ensured to be always in safe and effective working current, and the safety of the application unit can be ensured under the condition of ensuring the effective work of the application unit.
With reference to fig. 1, in accordance with another preferred embodiment of the present invention, based on the above embodiments, a signal adjusting unit is further disposed in the driving module, and the signal adjusting unit is disposed between the safety configuration resistor and the analog-to-digital converter. The signal conditioning unit can amplify or weaken the electric signal passing through the safety configuration resistor through anti-interference filtering and the like, so that the definition of the signal is improved on one hand, and the safety of circuit electric appliances is also protected on the other hand.
With reference to fig. 1, in accordance with another preferred embodiment of the present invention, based on the above embodiments, a reference power source is further disposed in the driving module, and the reference power source is connected to the safety configuration resistor. The reference power supply may be used to provide a reference voltage to the safety configuration resistor so that the resistance value of the safety configuration resistor may be obtained through more accurate measurement.
With continued reference to fig. 1, in accordance with another preferred embodiment of the present invention, based on the above embodiments, the driving module further includes a resistor and/or a resistor-capacitor, and the resistor and/or the resistor-capacitor is disposed in the circuit connecting the reference power source and the safety configuration resistor. Therefore, under the conditions that the voltage provided by the reference power supply is too high, the resistance value of the safety configuration resistor is too small, or the reference power supply and the safety configuration resistor are not matched to a certain extent, the voltage value in the circuit is adjusted by using the resistor or the resistor container, the safety of the circuit is guaranteed, and the selectable range of the reference power supply and the safety configuration resistor in the embodiment is expanded.
Another aspect of the present invention is to provide a control method for the safety circuit of the vehicle lamp described in the above embodiments. Referring to fig. 2, the method specifically includes the following steps:
s001: the microprocessor receives the operation data of the protection unit in the application module through the analog-to-digital converter;
that is, the protection unit sends its operation data to the analog-to-digital converter, and the analog-to-digital converter converts the operation data, such as an electrical signal, received by the analog-to-digital converter into a digital signal that can be processed by the microprocessor, and then sends the digital signal to the microprocessor.
S002: when the operation data of at least one protection device in the protection unit exceeds the normal operation data, reading the resistance value of the safety configuration resistor through an analog-to-digital converter;
the microprocessor compares the received numerical value signal with normal operation data representing normal operation of the protection unit, and if the comparison result shows that the operation data of at least one protection device in the protection unit exceeds the normal operation data, the microprocessor is configured to further acquire digital information representing the resistance value of the safety configuration resistor from the analog-to-digital converter.
S003: when the resistance value of the safety configuration resistor meets the normal working resistance value, a first control instruction is sent to the DC/DC converter according to the resistance value of the safety configuration resistor;
the microprocessor further compares the acquired digital information representing the resistance value of the safety configuration resistor with digital information representing the normal working resistance value of the normal working of the safety configuration resistor. When the comparison result shows that the resistance value of the safety configuration resistor satisfies the normal operation resistance value, it should be understood that the normal operation resistance value here is a range and should not be limited to a single value. At this time, the microprocessor sends a first control command to the DC/DC converter.
S004: the DC/DC converter distributes a first working current to the application unit according to the first control instruction;
thus, according to the first control command, the DC/DC converter converts the voltage or current of the external power supply into a predetermined operating current and supplies the operating current to the application unit. The specified operating current should be correlated with the resistance value of the safety configuration resistor.
S005: when the resistance value of the safety configuration resistor exceeds the normal working resistance value range, reading a default safety resistance value, and sending a second control instruction to the DC/DC converter according to the default safety resistance value;
the digital information characterizing the resistance value of the safety configuration resistor is compared with the digital information characterizing the normal operating resistance value of the normal operation of the safety configuration resistor. When the comparison result shows that the resistance value of the safety configuration resistor exceeds the normal working resistance value, the microprocessor reads a pre-stored default safety resistance value and sends a second control instruction to the DC/DC converter according to the default safety resistance value;
s006: the DC/DC converter distributes a second working current to the application unit according to the second control instruction.
Thus, according to the second control instruction, the DC/DC converter converts the voltage or current of the external power supply into another prescribed operating current to be supplied to the application unit for use. The specified operating current should also be correlated with the resistance value of the safety configuration resistor.
For example, as shown in table 1, when the resistance value of the safety configuration resistor is 0.5 to 12K, and the resistance value of the safety configuration resistor is less than 0.5K, it is determined that a short-circuit fault occurs, and when the resistance value of the safety configuration resistor is greater than 12K, it is determined that an open-circuit fault occurs, and at this time, the default safety resistance value is read, and the operating current is distributed according to the default safety resistance value. And when the resistance value of the safety configuration resistor is between 0.5 and 12K, distributing the working current according to the corresponding relation in the table 1.
TABLE 1 resistance vs. current output ratio of safety configuration resistor
| Resistance value of safety configuration resistor | Current output ratio |
| <0.5K | Short circuit fault |
| 1K | 95％ |
| 1.2K | 93％ |
| 1.3K | 91％ |
| 1.5K | 89％ |
| 1.6K | 87％ |
| 1.8K | 85％ |
| 2.0K | 83％ |
| 2.2K | 81％ |
| 2.4K | 79％ |
| 2.7K | 77％ |
| 3K | 75％ |
| 3.3K | 73％ |
| 3.6K | 71％ |
| 3.9K | 69％ |
| 4.3K | 67％ |
| 4.7K | 65％ |
| 5.1K | 63％ |
| 5.6K | 61％ |
| 6.2K | 59％ |
| 6.8K | 57％ |
| 7.5K | 55％ |
| 8.2K | 53％ |
| 9.1K | 51％ |
| >12K | Open circuit fault |
In other preferred embodiments consistent with the present invention, a signal conditioning unit, a reference power supply, a resistor and/or a resistor-capacitor, etc. may be further provided to ensure the normal operation of the safety circuit and the normal implementation of the control method thereof. The specific configuration and application method of these structural units are already described in the above embodiments related to the safety circuit, and are not described herein again.
In summary, the safety circuit and the control method thereof provided by the present invention add the safety configuration resistor in the lamp driving circuit, determine the minimum working current of the circuit through the resistance value of the safety configuration resistor, ensure the safe and normal operation of the lamp, and provide effective illumination or functional light; meanwhile, a default safety resistance value is also set, and when the safety configuration resistor also breaks down, the working current of the circuit can be determined according to the default safety resistance value, so that the safety and normal work of the car lamp circuit can be more effectively guaranteed; in addition, the functional safety current is configured by adopting the resistor separated from the driving module, so that the application circuit on the application module can be designed only according to the preset resistance meter under the condition of not changing the software and hardware bodies of the driving module, and the requirement of increasing the variety of the driving module according to different conditions is avoided.
The embodiments of the present invention have been described in detail, but the embodiments are merely examples, and the present invention is not limited to the embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent alterations and modifications are intended to be included within the scope of the present invention, without departing from the spirit and scope of the invention.
Claims (8)
1. A safety circuit for a vehicle lamp comprises a drive module, an application module connected with the drive module,
it is characterized in that the preparation method is characterized in that,
the driving module comprises a microprocessor, and a DC/DC converter and an analog-to-digital converter which are respectively connected with the microprocessor, wherein
The DC/DC converter is connected to an external power source,
the application module comprises an application unit and a protection unit, wherein
The application unit is connected with the DC/DC converter, the protection unit is connected with the analog-to-digital converter,
the application module is also provided with a safety configuration resistor which is connected with the analog-to-digital converter;
the microprocessor stores a default safety resistance value;
the driving module further comprises a reference power supply, and the reference power supply is connected to the safety configuration resistor.
2. The safety circuit according to claim 1,
the driving module is also provided with a signal adjusting unit, and the signal adjusting unit is arranged in a circuit between the safety configuration resistor and the analog-to-digital converter.
3. The safety circuit according to claim 2,
the driving module also comprises a resistor and/or a resistor container which is arranged on the driving module
A reference power supply is connected to the safety configuration resistor.
4. Safety circuit according to claim 1, characterized in that the protection unit comprises an operating current configuration resistor and/or a temperature sensor.
5. A control method for a safety circuit of a vehicle lamp includes the steps of,
the microprocessor receives the operation data of the protection unit in the application module through the analog-to-digital converter,
reading the resistance value of the safety configuration resistor through an analog-to-digital converter when the operation data of at least one protection device in the protection unit exceeds the normal operation data,
when the resistance value of the safety configuration resistor meets the normal working resistance value, a first control instruction is sent to the DC/DC converter according to the resistance value of the safety configuration resistor, and the DC/DC converter distributes a first working current to the application unit according to the first control instruction;
and when the resistance value of the safety configuration resistor exceeds the normal working resistance value range, reading a default safety resistance value, sending a second control instruction to the DC/DC converter according to the default safety resistance value, and distributing a second working current to the application unit by the DC/DC converter according to the second control instruction.
6. The control method according to claim 5,
the driving module is also provided with a signal adjusting unit which is arranged on the safety configuration resistor
And the analog-to-digital converter is used for regulating a voltage signal in the circuit.
7. The control method according to claim 6,
the driving module also comprises a resistor and/or a resistor container, and the resistor and/or the resistor container are arranged on the reference
And the power supply is connected with the safety configuration resistor and used for adjusting the voltage value in the circuit.
8. The control method according to claim 5,
the protection unit comprises an operating current configuration resistor and a temperature sensor,
the operating current configuration resistor is used for adjusting the voltage value in the operating circuit in the application module,
the temperature sensor is used for acquiring a temperature value in a working circuit in the application module.
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| CN201910399172.3A CN111942271B (en) | 2019-05-14 | 2019-05-14 | Safety circuit for car lamp and control method thereof |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102378456A (en) * | 2011-11-22 | 2012-03-14 | 四川华体灯业有限公司 | System for realizing data acquisition and processing on illuminator by utilizing microcontroller |
| CN206302597U (en) * | 2016-10-13 | 2017-07-04 | 重庆瑞升康博电气有限公司 | Power-adjustable Multifucntional LED power driver |
| CN107666732A (en) * | 2016-07-27 | 2018-02-06 | 常州星宇车灯股份有限公司 | A kind of control circuit and control method of automobile-used great power LED |
| CN109152142A (en) * | 2018-09-25 | 2019-01-04 | 杰华特微电子（杭州）有限公司 | Switching Power Supply and LED drive circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5947786B2 (en) * | 2011-03-07 | 2016-07-06 | ローム株式会社 | Switching current control circuit, LED dimming system, and LED lighting device |
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- 2019-05-14 CN CN201910399172.3A patent/CN111942271B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102378456A (en) * | 2011-11-22 | 2012-03-14 | 四川华体灯业有限公司 | System for realizing data acquisition and processing on illuminator by utilizing microcontroller |
| CN107666732A (en) * | 2016-07-27 | 2018-02-06 | 常州星宇车灯股份有限公司 | A kind of control circuit and control method of automobile-used great power LED |
| CN206302597U (en) * | 2016-10-13 | 2017-07-04 | 重庆瑞升康博电气有限公司 | Power-adjustable Multifucntional LED power driver |
| CN109152142A (en) * | 2018-09-25 | 2019-01-04 | 杰华特微电子（杭州）有限公司 | Switching Power Supply and LED drive circuit |
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