CN111465137A - PID control method for regulating output current of vehicle lamp driving module - Google Patents
PID control method for regulating output current of vehicle lamp driving module Download PDFInfo
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- CN111465137A CN111465137A CN202010403982.4A CN202010403982A CN111465137A CN 111465137 A CN111465137 A CN 111465137A CN 202010403982 A CN202010403982 A CN 202010403982A CN 111465137 A CN111465137 A CN 111465137A
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- microprocessor
- driving chip
- pwm
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The invention discloses a PID control method for adjusting output current of a vehicle lamp driving module.A microprocessor outputs PWM square waves with fixed duty ratio through a PWM port, and the PWM square waves are filtered into direct current signals through RC and sent to an analog dimming ADIM pin of an L ED driving chip, so that the driving chip outputs and lights the L ED. microprocessor, and the voltage value on the ADMI pin of the driving chip is sampled through AD and compared with the previous set value, thereby adjusting the duty ratio of the output PWM, keeping the output current value of the driving chip consistent with the set value, and ensuring the lighting effect of L ED.
Description
Technical Field
The invention relates to the control technology of an L ED illuminating lamp for a vehicle, in particular to output current closed-loop control of a vehicle lamp driving module.
Background
With the continuous popularization of the application of the light emitting diode (L ED) in the automobile lamp, the body shadow of L ED appears in each functional lamp of the automobile, such as a front lamp, a daytime running lamp, a steering lamp, a tail lamp, a back-up lamp and the like, which can send signals to other vehicles and pedestrians when the automobile brakes, turns around or turns, L ED has excellent light source intensity, and can keep high visibility even in fog weather, constant current control needs to be realized for the high-power L ED such as the front lamp and the daytime running lamp, and the output current of the driving module can be accurately controlled by adjusting the current value to reduce the power when the temperature of L ED rises, so that the constant current lighting of L ED is realized, and the problem which needs to be solved in actual design and manufacturing work is urgent.
Disclosure of Invention
The invention aims to solve the problems and provides a PID control method for adjusting the output current of a vehicle lamp driving module, so as to achieve the aim of L ED constant current lighting.
A PID control method for adjusting output current of a vehicle lamp driving module comprises the following steps:
s1: configuring the input and output states of each port of the microprocessor and initializing the microprocessor;
s2: configuring the PWM output port to initialize the duty ratio value of 0 percent and initializing the function of an AD sampling module;
s3, the L ED lighting current value of the driving output is a PWM waveform calculated and output according to L ED branch BIN resistors sampled by the AD of the microprocessor and voltage values corresponding to the NTC, the output PWM waveform is changed into a direct current signal V1 after passing through an RC filter circuit, and the direct current signal is input to an analog dimming ADIM pin of the driving chip to regulate the output current of the driving chip;
s4: the microprocessor carries out AD sampling on the level on the analog dimming ADIM pin of the driving chip, and real-time comparison is carried out on the level and V1 which is theoretically calculated, so that the duty ratio of the PWM waveform is adjusted in real time, and the current PID control of the driving module is realized;
and S5, lighting a corresponding function L ED according to the vehicle lamp input state acquired by the microprocessor.
The microprocessor outputs a PWM square wave with a fixed duty ratio through a PWM port, and the PWM square wave is filtered by an RC to form a direct current signal to an analog dimming ADIM pin of an L ED driving chip, so that the driving chip outputs and lights the L ED. microprocessor, and the voltage value on the ADMI pin of the driving chip is sampled by an AD and compared with a previous set value, thereby adjusting the duty ratio of the output PWM, keeping the output current value of the driving chip consistent with the set value, and ensuring the lighting effect of L ED.
Drawings
FIG. 1 is a block diagram of a PID control scheme of the invention.
Detailed Description
In order to make the method, means, technical features, achievement effects and application range of the invention easy to understand, the invention is further explained below.
A PID control method for adjusting output current of a vehicle lamp driving module comprises the following steps:
s1: configuring the input and output states of each port of the microprocessor and initializing the microprocessor;
s2: configuring the PWM output port to initialize the duty ratio value of 0 percent and initializing the function of an AD sampling module;
s3, the L ED lighting current value of the driving output is a PWM waveform calculated and output according to L ED voltage values corresponding to the BIN resistor and the NTC thermistor sampled by the AD of the microprocessor, the output PWM waveform is changed into a direct current signal V1 after passing through an RC filter circuit, and the direct current signal is input to an analog dimming ADIM pin of the driving chip to regulate the output current of the driving chip;
s4: the microprocessor carries out AD sampling on the level on the analog dimming ADIM pin of the driving chip, and real-time comparison is carried out on the level and V1 which is theoretically calculated, so that the duty ratio of the PWM waveform is adjusted in real time, and the current PID control of the driving module is realized;
and S5, lighting a corresponding function L ED according to the vehicle lamp input state acquired by the microprocessor.
The specific control logic is that when the vehicle lamp obtains an input signal and L ED needs to be lightened, the microprocessor firstly carries out AD sampling on the voltage on a BIN-divided resistor of L ED, then carries out AD sampling on the voltage value on NTC, calculates the duty ratio of an output PWM square wave according to the voltage value obtained by twice AD sampling, outputs the PWM square wave with the corresponding duty ratio, carries out filtering through an RC (resistance-capacitance) filtering circuit, filters the square wave into a direct-current signal V1 and outputs the direct-current signal V1 to an analog dimming ADIM pin of a L ED driving chip, carries out analog dimming on the L ED, and lightens L ED and L ED in real time to sample the voltage on the analog dimming ADIM pin of the driving chip and obtain the voltage value of the voltage value in the process that the microprocessor is lightened
And the voltage value is compared with V1, so that the duty ratio of the output PWM square wave is adjusted in real time, the analog dimming voltage of the L ED driving module is consistent with a set value, and the stable work of L ED is ensured.
Claims (1)
1. A PID control method for adjusting output current of a vehicle lamp driving module is characterized by comprising the following steps:
s1: configuring the input and output states of each port of the microprocessor and initializing the microprocessor;
s2: configuring the PWM output port to initialize the duty ratio value of 0 percent and initializing the function of an AD sampling module;
s3, the L ED lighting current value of the driving output is a PWM waveform calculated and output according to L ED branch BIN resistors sampled by the AD of the microprocessor and voltage values corresponding to the NTC, the output PWM waveform is changed into a direct current signal V1 after passing through an RC filter circuit, and the direct current signal is input to an analog dimming ADIM pin of the driving chip to regulate the output current of the driving chip;
s4: the microprocessor carries out AD sampling on the level on the analog dimming ADIM pin of the driving chip, and real-time comparison is carried out on the level and V1 which is theoretically calculated, so that the duty ratio of the PWM waveform is adjusted in real time, and the current PID control of the driving module is realized;
and S5, lighting a corresponding function L ED according to the vehicle lamp input state acquired by the microprocessor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010403982.4A CN111465137A (en) | 2020-05-13 | 2020-05-13 | PID control method for regulating output current of vehicle lamp driving module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010403982.4A CN111465137A (en) | 2020-05-13 | 2020-05-13 | PID control method for regulating output current of vehicle lamp driving module |
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| CN111465137A true CN111465137A (en) | 2020-07-28 |
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| CN202010403982.4A Pending CN111465137A (en) | 2020-05-13 | 2020-05-13 | PID control method for regulating output current of vehicle lamp driving module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112399671A (en) * | 2020-12-08 | 2021-02-23 | 中山市优胜电子科技有限公司 | PWM pulse width voltage constant current circuit |
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| KR20110121330A (en) * | 2010-04-30 | 2011-11-07 | 매그나칩 반도체 유한회사 | Led driving circuit for back light and driving method thereof and back light driving apparatus |
| CN102811525A (en) * | 2011-05-31 | 2012-12-05 | 海洋王照明科技股份有限公司 | LED lamp and control circuit thereof |
| WO2014194041A1 (en) * | 2013-05-31 | 2014-12-04 | Smart Fos, Inc. | Systems and methods for providing a self-adjusting light source |
| CN204190977U (en) * | 2014-09-16 | 2015-03-04 | 南京师范大学 | Multifunctional LED simulating nature light gradually bright system |
| CN105744686A (en) * | 2016-04-21 | 2016-07-06 | 上海互兴科技股份有限公司 | Four-in-one compatible dimming NFC control LED driving power supply |
| CN106535409A (en) * | 2016-12-03 | 2017-03-22 | 河池学院 | Constant current switching power supply system for LED illumination |
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2020
- 2020-05-13 CN CN202010403982.4A patent/CN111465137A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110121330A (en) * | 2010-04-30 | 2011-11-07 | 매그나칩 반도체 유한회사 | Led driving circuit for back light and driving method thereof and back light driving apparatus |
| CN102811525A (en) * | 2011-05-31 | 2012-12-05 | 海洋王照明科技股份有限公司 | LED lamp and control circuit thereof |
| WO2014194041A1 (en) * | 2013-05-31 | 2014-12-04 | Smart Fos, Inc. | Systems and methods for providing a self-adjusting light source |
| CN204190977U (en) * | 2014-09-16 | 2015-03-04 | 南京师范大学 | Multifunctional LED simulating nature light gradually bright system |
| CN105744686A (en) * | 2016-04-21 | 2016-07-06 | 上海互兴科技股份有限公司 | Four-in-one compatible dimming NFC control LED driving power supply |
| CN106535409A (en) * | 2016-12-03 | 2017-03-22 | 河池学院 | Constant current switching power supply system for LED illumination |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112399671A (en) * | 2020-12-08 | 2021-02-23 | 中山市优胜电子科技有限公司 | PWM pulse width voltage constant current circuit |
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Application publication date: 20200728 |
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