CN112770449B - Constant-current driving system for automobile signal lamp and driving method thereof - Google Patents
Constant-current driving system for automobile signal lamp and driving method thereof Download PDFInfo
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Abstract
The constant current driving system for the automobile signal lamp and the driving method thereof comprise a constant current driving unit, an LED load unit, a micro control unit and a controlled switch unit, wherein the controlled switch unit, the constant current driving unit and the micro control unit are connected with the LED load unit in a high-end driving or low-end driving mode, and the micro control unit sends corresponding PWM control signals to the controlled switch unit and the constant current driving unit according to input signals and sends corresponding analog control signals to the constant current driving unit; the constant current driving unit drives the daytime running lights, the position lights and the steering lights of the vehicle through one path of constant current according to the analog and digital dimming instruction signals; the normal work of each signal lamp is realized, the working logic required by different regulations can be flexibly met, and meanwhile, the cost of the automobile signal lamp driving module and the size of the module are greatly reduced.
Description
Technical Field
The invention belongs to the field of automobile illumination, and particularly relates to a constant current driving system for an automobile signal lamp and a driving method thereof.
Background
For a Daytime Running Light (DRL), a Position Light (PL), a steering light (FTL) or a brake light (STOP), a Tail Light (TL) and a steering light (Turn) in an automobile LED signal lamp, the characteristics are that the daytime running light or the brake light (100% duty ratio is lighted) and the position light or the tail light (about 10% duty ratio is lighted) share one LED load (hereinafter referred to as a shared LED light source for short), and the high and low brightness switching is realized in a digital dimming mode.
When the LED light source of the turn signal is close to the common LED light source, regulations dictate that the common LED light source must be switched to a low-light mode or a light-out mode when the turn signal is on, in order to ensure that the yellow light of the turn signal is highlighted and not affected by the brightness of other light sources in the vicinity.
As shown in fig. 1, the daytime running light, the position light and the turn light in the conventional control system are driven by two paths of LED constant currents respectively, and a PWM output is generated to a digital dimming pin of the LED constant current drive when the input of the turn light is valid through a PWM generating circuit, so as to control the switching of the daytime running light into the position light when the turn light works. The two resistors R1 and R2 are respectively analog dimming adjusting resistors driven by the constant currents of the LED1 and the LED2, the resistors are welded on the LED circuit board, different LED loads are attached with different resistance values, and different current outputs can be obtained. In addition, in order to ensure that the product can work safely under severe high-temperature environment, a thermistor NTC is further added on the LED load to sense the environment temperature, so that the control module can take necessary safety measures when the environment temperature is too high.
According to different driving output power, the driving mode of the LED constant current driving circuit is various for the current increasingly severe competitive pressure, the LED constant current driving occupies 2/3 of the cost of the whole system, the area of a PCB (printed circuit board) and the cost and the volume of a control module cannot be reduced.
The application number is: 201711224002.9 discloses a multi-path LED constant current control module, a driving circuit and a control method, which comprises the following steps: a voltage input module; an inductance for outputting stable electric energy; a plurality of LED light strings; the output current sampling modules are in one-to-one correspondence with the LED lamp strings and generate output current sampling signals; an output voltage feedback module that generates an output voltage feedback signal; the multi-channel LED constant current control module is used for generating compensation current and performing constant current and constant voltage control; and a loop compensation module for generating a compensation voltage. And obtaining an output voltage feedback signal and each output current sampling signal, comparing the larger output voltage feedback signal and each output current sampling signal under the same working voltage with a reference voltage, and obtaining a common compensation voltage, so as to adjust the pulse width of a switch control signal and control the output to be constant.
The application number is: 201310740160.5 discloses an LED constant current driver which provides constant current driving for an LED load and comprises a power factor correction unit, a constant voltage control unit and a constant current control unit, wherein a first end of the constant current control unit is connected with a negative end of the LED load, one end of the constant voltage control unit is connected between the constant current control unit and the negative end of the LED load, the constant current control unit controls current flowing through the LED load, and the constant voltage control unit controls voltage of the first end of the constant current control unit.
The application number is: 201611086010.7 discloses a constant-current LED driving circuit, which comprises a low-voltage driving chip module and a power MOS chip module which are integrally packaged, wherein the low-voltage driving chip module is provided with a low-voltage power supply end VDD, a Drain end Drain, a ground end GND and a gate end GD, the low-voltage power supply end VDD is grounded through a voltage stabilizing capacitor, the ground end GND is grounded through a resistor, a Drain electrode, a source electrode and a grid electrode of the power MOS chip module are respectively connected with the Drain end Drain, the ground end GND and the gate end GD of the low-voltage driving chip module in a one-to-one correspondence manner, and the Drain end Drain is an output end of the constant-current LED driving circuit.
Disclosure of Invention
In order to solve the problems, the invention provides a constant current driving system for an automobile signal lamp and a driving method thereof, and the technical scheme is as follows:
a constant current driving system for an automobile signal lamp drives an LED load unit which is lighted by a set constant current driving unit to form a response to the current driving requirement,
the constant current driving unit is arranged for constant current driving with adjustable output current;
an analog dimming end and a digital dimming end are arranged in the constant current driving unit;
a micro control unit and a controlled switch unit are also arranged in the system; the micro-control unit is used for controlling the micro-control unit,
On the one hand, according to the received input signal, an analog control signal is output to an analog dimming end of the constant current driving unit,
on the other hand, according to the received input signals, corresponding PWM signals are output to a digital dimming end of the constant current driving unit and the controlled switch unit;
the constant-current driving unit is provided with a constant-current driving circuit,
determining the output value of the constant current driving unit according to the corresponding instruction received by the analog dimming end,
determining an effective output period of an output value of the constant current driving unit according to a corresponding instruction received by the digital dimming end;
the constant current driving unit with determined output value and corresponding effective output period is combined with the controlled switching unit controlled by PWM signals to realize the logic control of the response of the daytime running light, the position light and the steering light of the vehicle according to regulations through one path of constant current driving;
when the control circuit is used for controlling the lighting of the daytime running light, the PWM signal is output as a 100% duty ratio signal;
when used for controlling to light a position lamp, the output PWM signal is an N% duty cycle signal, N epsilon (0, 100);
when used to control the turning on of a turn signal, the output PWM signal is a 100% duty cycle signal, or when used to control the turning on of a turn signal, the output PWM signal is an M% duty cycle signal, and m=100-N at this time.
According to the constant current driving system for the automobile signal lamp,
an analog signal acquisition unit is also arranged in the system,
the analog signal acquisition unit is used for providing an analog source for outputting an analog control signal by the micro control unit.
According to the constant current driving system for the automobile signal lamp,
the analog control signal output to the analog dimming end of the constant current driving unit is formed by executing a corresponding program of the micro control unit according to the input signal.
According to the constant current driving system for the automobile signal lamp,
the LED load unit comprises a first LED load unit and a second LED load unit;
the first LED load unit corresponds to a daytime running light or a position light;
the second LED load unit corresponds to the turn light;
in response to this, the control unit,
the controlled switching unit is configured to:
a first controlled switch unit corresponding to the first LED load unit,
A second controlled switching unit corresponding to the second LED load unit;
the PWM signal comprises:
a first PWM signal corresponding to the lighting of the daytime running light,
A second PWM signal for lighting the corresponding position lamp,
A third PWM signal corresponding to the turning-on of the turn signal;
the analog signal acquisition unit includes:
A first analog signal acquisition unit corresponding to the current value of the daytime running light or the position light,
And the second analog signal acquisition unit corresponds to the current value of the steering lamp.
According to the constant current driving system for the automobile signal lamp,
the LED load unit comprises a first LED load unit and a second LED load unit;
the first LED load unit corresponds to a daytime running light or a position light;
the second LED load unit corresponds to the turn light;
in response to this, the control unit,
the controlled switching unit is configured to:
a first controlled switch unit corresponding to the first LED load unit,
A second controlled switching unit corresponding to the second LED load unit;
the PWM signal comprises:
a first PWM signal corresponding to the lighting of the daytime running light,
A second PWM signal for lighting the corresponding position lamp,
A third PWM signal corresponding to the turning-on of the turn signal;
the analog control signal output by the micro control unit includes:
a first analog control signal corresponding to the current value of the daytime running light or position light,
And a second analog control signal corresponding to the turn signal current value.
According to the constant current driving system for the automobile signal lamp,
the constant current driving unit, the micro control unit and the controlled switching unit form high-end driving or low-end driving of the LED load unit.
According to the constant current driving system for the automobile signal lamp,
the constant current driving system is also provided with a first safety control unit,
the first safety control unit is used for monitoring the analog signals received by the micro control unit in real time,
and when the analog signal is monitored to exceed the safety threshold, the micro control unit sends out an instruction for switching off the controlled switching unit and the constant current driving unit.
According to the constant current driving system for the automobile signal lamp,
and a second safety control unit is further arranged on the constant current driving system, monitors the current environment temperature in real time, notifies the micro control unit when the temperature exceeds a safety threshold value, and turns off the controlled switch unit and the constant current driving unit according to the received notification.
The constant current driving system for the automobile signal lamp
In the micro control unit, an analog control signal output port is shared with any one of the ports for receiving the first analog signal acquisition unit or the second analog signal acquisition unit.
According to the constant current driving system for the automobile signal lamp,
the analog signal acquisition unit is composed of a resistor and a corresponding voltage stabilizing source.
According to the constant current driving system for the automobile signal lamp,
the constant current driving system can also be used for the lighting of brake lamps, tail lamps and turn lamps,
the constant current driving unit with determined output value and corresponding effective output period is combined with the controlled switching unit controlled by PWM signals to realize the logic control of the response of the brake lamp, the tail lamp and the steering lamp of the vehicle according to regulations through one path of constant current driving.
A constant-current driving method for an automobile signal lamp is provided, which is characterized in that an LED load unit is lightened by a set constant-current driving unit to respond to the lightening requirements of a daytime running light, a position light and a turn light for the automobile,
the driving method is completed by a micro control unit, a controlled switch unit and a matched constant current driving unit, wherein an analog dimming end and a digital dimming end are arranged in the constant current driving unit; the method specifically comprises the following steps:
s1: the micro-control unit receives an input signal,
s2: the micro-control unit is configured to receive an input signal,
a corresponding PWM control signal is sent to a digital dimming end of the controlled switch unit and the constant current driving unit,
a corresponding analog control signal is sent to an analog dimming end of the constant current driving unit,
s3: a constant-current driving unit,
Determining the output value of the constant current driving unit according to the corresponding instruction received by the analog dimming end,
determining an effective output period of an output value of the constant current driving unit according to a corresponding instruction received by the digital dimming end;
s4: the constant current driving unit with determined output value and corresponding effective output period is combined with the controlled switching unit controlled by the PWM signal to complete the driving of the LED load unit;
according to the constant-current driving method for the automobile signal lamp, logic control for responding to the automobile daytime running lamp, the position lamp and the steering lamp according to regulations is established through one-path constant-current driving through the steps;
the LED load units comprise a first LED load unit for lighting a daytime running light or a position light and a second LED load unit for lighting a steering light;
in response to this, the control unit,
the controlled switch unit comprises a first controlled switch unit and a second controlled switch unit,
the first controlled switching unit is connected with a first LED load unit,
the second controlled switching unit is connected with a second LED load unit,
the micro control unit is connected to the digital dimming end of the constant current driving unit through the set PWM signal output end;
corresponding first PWM signal control ends and second PWM signal control ends are arranged according to the first controlled switch unit and the second controlled switch unit, and the first PWM signal control ends or the second PWM signal control ends are homologous to PWM signal output ends of digital dimming ends connected to the constant current drive units;
The analog control signal output by the micro control unit includes:
a first analog control signal corresponding to the current value of the daytime running light or position light,
A second analog control signal corresponding to the turn signal current value;
according to the driving method, the daytime running lights, the position lights and the steering lights for the vehicle can be respectively lightened according to the requirements through the following steps:
s11: the micro control unit receives an input signal;
when the input signal is a daytime running light, the step S12 is entered;
when the input signal is a position light, the step S13 is entered;
when the input signal is a turn signal, the step S14 is entered;
s12: the micro control unit reads the analog quantity information of the first analog signal acquisition unit and sends corresponding analog control instructions to the analog dimming end of the constant current driving unit according to the reading,
the micro control unit outputs a PWM control signal with the duty ratio of 100% to the digital dimming ends of the first controlled switch unit and the constant current driving unit according to the input signal,
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes the lighting of the daytime running lights of the LED load units together by combining the switching control established by the current first controlled switching unit according to the received PWM signals;
S13: the micro control unit reads the analog quantity information of the first analog signal acquisition unit and sends corresponding analog control instructions to the analog dimming end of the constant current driving unit according to the reading,
the micro control unit outputs PWM control signals with the duty ratio of N% to the digital dimming ends of the first controlled switch unit and the constant current driving unit according to the input signals, N epsilon (0, 100),
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes the position lamp lighting of the LED load unit together by combining the switch control established by the current first controlled switch unit according to the received PWM signals;
s14: the micro control unit reads the analog quantity information of the second analog signal acquisition unit and issues corresponding analog control instructions to the analog dimming end of the constant current driving unit according to the reading,
the micro control unit outputs a PWM control signal with the duty ratio of 100% to the digital dimming end of the second controlled switch unit and the constant current driving unit according to the input signal,
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes turning-on of the LED load units by combining switch control established by the current second controlled switch unit according to the received PWM signals;
Or alternatively, the first and second heat exchangers may be,
according to the driving method, the situation that the sun lamp, the position lamp and the steering lamp for the vehicle are respectively lightened according to the requirement of the regulations and simultaneously lightened can be established by the following steps:
s21: the micro control unit receives an input signal;
when the input signal is a daytime running light, the step S22 is entered;
when the input signal is a position light, the step S23 is entered;
when the input signal is a turn signal lamp and the position lamp are required to be turned off, the step S24 is performed;
when the input signal is a turn signal lamp and the daytime running light is required to be switched to a position lamp, the step S25 is entered;
s22: the micro control unit reads the analog quantity information of the first analog signal acquisition unit and sends corresponding analog control instructions to the analog dimming end of the constant current driving unit according to the reading,
the micro control unit outputs a PWM control signal with the duty ratio of 100% to the digital dimming ends of the first controlled switch unit and the constant current driving unit according to the input signal,
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes the lighting of the daytime running lights of the LED load units together by combining the switching control established by the current first controlled switching unit according to the received PWM signals;
S23: the micro control unit reads the analog quantity information of the first analog signal acquisition unit and sends corresponding analog control instructions to the analog dimming end of the constant current driving unit according to the reading,
the micro control unit outputs PWM control signals with the duty ratio of N% to the digital dimming ends of the first controlled switch unit and the constant current driving unit according to the input signals, N epsilon (0, 100),
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes the position lamp lighting of the LED load unit together by combining the switch control established by the current first controlled switch unit according to the received PWM signals;
s24: the micro control unit reads the analog quantity information of the second analog signal acquisition unit and issues corresponding analog control instructions to the analog dimming end of the constant current driving unit according to the reading,
the micro control unit outputs a PWM control signal with a duty ratio of M% to the digital dimming end of the second controlled switch unit and the constant current driving unit according to the input signal, the intersection of M and N in the PWM of one period is an empty set in time,
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes turning-on of the LED load units by combining switch control established by the current second controlled switch unit according to the received PWM signals;
S25: in the time with the duty ratio of N%, the micro-control unit reads the analog quantity information of the first analog signal acquisition unit, and sends corresponding analog control instructions to the analog dimming end of the constant current driving unit according to the reading, meanwhile, the micro-control unit outputs PWM control signals with the duty ratio of N% to the digital dimming ends of the first controlled switching unit and the constant current driving unit, N epsilon (0, 100),
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes the position lamp lighting of the LED load unit together by combining the switch control established by the current first controlled switch unit according to the received PWM signals;
in the time with the duty ratio of M%, the micro control unit reads analog quantity information of the second analog signal acquisition unit, and sends corresponding analog control instructions to an analog dimming end of the constant current driving unit according to the reading, and meanwhile, the micro control unit outputs PWM control signals with the duty ratio of M% to a digital dimming end of the second controlled switching unit and the constant current driving unit, wherein M=100-N;
and the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes turning-on of the LED load unit by combining switch control established by the current second high-end light-on unit according to the received PWM signals.
According to the constant current driving method for the automobile signal lamp of the invention,
the driving method provides an analog source for outputting an analog control signal by the micro control unit through the set analog signal acquisition unit.
According to the constant current driving method for the automobile signal lamp of the invention,
the analog control signal in step S2 is formed by the micro control unit executing its own corresponding program according to the input signal.
According to the constant current driving method for the automobile signal lamp of the invention,
after the micro control unit receives the input signal, the micro control unit and the constant current unit perform safety control supervision through the safety control unit before finishing output;
the safety control unit sends the current value monitored in real time to the micro control unit, and the micro control unit sends corresponding control instructions according to the read and comparison with the set safety threshold value;
when the current value read by the micro control unit is greater than or equal to a set safety threshold value, the micro control unit issues a turn-off instruction to the constant current driving unit and the controlled switch unit;
when the current value read by the micro control unit is smaller than the safety threshold value, the step S2 is entered.
According to the constant current driving method for the automobile signal lamp of the invention,
After the micro control unit receives the input signal, the micro control unit and the constant current unit perform safety control supervision through the safety control unit before finishing output;
the safety control unit sends the current value monitored in real time to the micro control unit, and the micro control unit sends corresponding control instructions according to the read and comparison with the set safety threshold value;
when the current value read by the micro control unit is greater than or equal to a set safety threshold value, the micro control unit issues a turn-off instruction to the constant current driving unit and the controlled switch unit;
when the current value read by the micro control unit is smaller than the safety threshold value, the step S2 is entered.
According to the constant current driving method for the automobile signal lamp of the invention,
the safety control unit is used for establishing safety monitoring when the ambient temperature is too high.
According to the constant current driving method for the automobile signal lamp of the invention,
the safety control unit is used for establishing safety monitoring under the conditions of over-high ambient temperature or over-high analog control quantity.
According to the constant current driving method for the automobile signal lamp of the invention,
in the micro control unit, the analog signal instruction output end is shared with any one of the ports for receiving the first analog signal acquisition unit or the second analog signal acquisition unit.
According to the constant current driving method for the automobile signal lamp of the invention,
and the controlled switching unit combines the driving current output according to the received PWM control signal to form high-end driving or low-end driving of the LED load unit.
According to the constant current driving system for the automobile signal lamp and the driving method thereof, the principle of mutually exclusive lighting (namely, when PWM control is based on N% duty ratio and M% duty ratio in the text, the intersection of M and N in the PWM of one period is an empty set) is utilized to realize the corresponding logic switching function by sharing one LED constant current driving, normal work of each signal lamp is realized, and the working logic required by different regulations can be flexibly met; the cost of the automobile signal lamp driving module and the size of the module are greatly reduced; when the steering lamp is turned on, no matter whether the daytime running lamp and the position lamp are required to be turned off at the moment or the daytime running lamp is required to be converted into the position lamp, the system and the corresponding driving method provided by the invention can be realized; the analog control signal used for determining the output value of the constant current driving unit can be provided by a corresponding circuit of the peripheral equipment or can be built by a program in the microcontroller, so that flexible transformation space is provided for adaptation of different situations; and a safety control mechanism of the system is established for monitoring the situation when the voltage value of the analog control signal read by the micro control and the temperature protection module exceeds a safety threshold value.
Drawings
FIG. 1 is a schematic diagram of a conventional constant current driving scheme in the prior art;
FIG. 2 is a schematic overall view of a driving system with an analog signal acquisition unit according to the present invention;
FIG. 3 is a schematic view of the specific structure based on FIG. 2 in the present invention;
FIG. 4 is a schematic overall view of a driving system without an analog signal acquisition unit according to the present invention;
FIG. 5 is a schematic view of the specific structure based on FIG. 4 in the present invention;
FIG. 6 is a general schematic step diagram of the driving method of the present invention;
FIG. 7 is a schematic diagram showing steps for a driving method according to the present invention, in which an analog signal acquisition unit is provided, when the driving method individually meets respective lighting requirements;
FIG. 8 is a schematic diagram showing steps performed when the analog signal acquisition units are provided in the driving method of the present invention, and the analog signal acquisition units can be turned on separately and simultaneously;
FIG. 9 is a schematic diagram showing steps for a driving method according to the present invention, in which the analog signal acquisition units are not provided, and the driving method is performed in a single step when the respective lighting requirements are satisfied;
FIG. 10 is a schematic diagram showing steps performed when the analog signal acquisition units are not provided in the driving method of the present invention, and the analog signal acquisition units can be turned on separately and simultaneously;
FIG. 11 is a schematic diagram of a high-end input structure in embodiment 1 of the present invention;
FIG. 12 is a schematic diagram of the low-end input structure mentioned in embodiment 1 of the present invention;
FIG. 13 is a schematic view of a high-end input structure in embodiment 2 of the present invention;
FIG. 14 is a schematic view of a low-end input structure in embodiment 2 of the present invention
FIG. 15 is a logic timing diagram according to an embodiment of the present invention.
Detailed Description
The invention further provides a constant current driving system for an automobile signal lamp and a driving method thereof according to the attached drawings and the specific embodiments.
The constant current driving system for an automobile signal lamp as shown in fig. 2, 3 or 4 and 5, wherein the set constant current driving unit drives the LED load unit to be lightened to form a response to the current driving requirement, and the constant current driving system is characterized in that:
the constant current driving unit is arranged for constant current driving with adjustable output current;
an analog dimming end and a digital dimming end are arranged in the constant current driving unit;
a micro control unit and a controlled switch unit are also arranged in the system; the micro-control unit is used for controlling the micro-control unit,
on the one hand, according to the received input signal, an analog control signal is output to an analog dimming end of the constant current driving unit,
on the other hand, according to the received input signals, corresponding PWM signals are output to a digital dimming end of the constant current driving unit and the controlled switch unit;
The constant-current driving unit is provided with a constant-current driving circuit,
determining the output value of the constant current driving unit according to the corresponding instruction received by the analog dimming end,
determining an effective output period of an output value of the constant current driving unit according to a corresponding instruction received by the digital dimming end;
the constant current driving unit with determined output value and corresponding effective output period is combined with the controlled switching unit controlled by PWM signals to realize the logic control of the response of the daytime running light, the position light and the steering light of the vehicle according to regulations through one path of constant current driving.
Wherein,
an analog signal acquisition unit is also arranged in the system,
the analog signal acquisition unit is used for providing an analog source for outputting an analog control signal by the micro control unit.
Or alternatively, the first and second heat exchangers may be,
the analog control signal output to the analog dimming end of the constant current driving unit is formed by executing a corresponding program of the micro control unit according to the input signal.
Wherein,
the LED load unit comprises a first LED load unit and a second LED load unit;
the first LED load unit corresponds to a daytime running light or a position light;
the second LED load unit corresponds to the turn light;
in response to this, the control unit,
the controlled switching unit is configured to:
a first controlled switch unit corresponding to the first LED load unit,
A second controlled switching unit corresponding to the second LED load unit;
the PWM signal comprises:
a first PWM signal corresponding to the lighting of the daytime running light,
A second PWM signal for lighting the corresponding position lamp,
A third PWM signal corresponding to the turning-on of the turn signal;
the analog signal acquisition unit includes:
a first analog signal acquisition unit corresponding to the current value of the daytime running light or the position light,
And the second analog signal acquisition unit corresponds to the current value of the steering lamp.
Or alternatively, the first and second heat exchangers may be,
the analog control signal output by the micro control unit includes:
a first analog control signal corresponding to the current value of the daytime running light or position light,
And a second analog control signal corresponding to the turn signal current value.
Wherein,
the constant current driving unit, the micro control unit and the controlled switching unit form high-end driving or low-end driving of the LED load unit.
Wherein,
the constant current driving system is also provided with a first safety control unit,
the first safety control unit is used for monitoring the analog signals received by the micro control unit in real time,
and when the analog signal is monitored to exceed the safety threshold, the micro control unit sends out an instruction for switching off the controlled switching unit and the constant current driving unit.
Wherein,
and a second safety control unit is further arranged on the constant current driving system, monitors the current environment temperature in real time, notifies the micro control unit when the temperature exceeds a safety threshold value, and turns off the controlled switch unit and the constant current driving unit according to the received notification.
Wherein,
when the control circuit is used for controlling the lighting of the daytime running light, the PWM signal is output as a 100% duty ratio signal;
when used for controlling to light a position lamp, the output PWM signal is an N% duty cycle signal, N epsilon (0, 100);
when used to control the turning on of a turn signal, the output PWM signal is a 100% duty cycle signal.
Or alternatively, the first and second heat exchangers may be,
when the control circuit is used for controlling the lighting of the daytime running light, the PWM signal is output as a 100% duty ratio signal;
when used for controlling to light a position lamp, the output PWM signal is an N% duty cycle signal, N epsilon (0, 100);
when the control circuit is used for controlling the turning-on of the steering lamp, the output PWM signal is an M% duty ratio signal, and the intersection of M and N in PWM of one period in time is a null set.
Wherein,
m=100-N, i.e.: m and N form a PWM cycle.
Wherein,
in the micro control unit, an analog control signal output port is shared with any one of the ports for receiving the first analog signal acquisition unit or the second analog signal acquisition unit.
Wherein,
the analog signal acquisition unit is composed of a resistor and a corresponding voltage stabilizing source.
Wherein,
the constant current driving system can also be used for the lighting of brake lamps, tail lamps and turn lamps,
the constant current driving unit with determined output value and corresponding effective output period is combined with the controlled switching unit controlled by PWM signals to realize the logic control of the response of the brake lamp, the tail lamp and the steering lamp of the vehicle according to regulations through one path of constant current driving.
The constant current driving method for the automobile signal lamp as shown in fig. 6, wherein the LED load unit is turned on by the set constant current driving unit, so as to respond to the lighting requirements of the daytime running light, the position light and the turn signal light for the automobile, is characterized in that:
the driving method is completed by a micro control unit, a controlled switch unit and a matched constant current driving unit, wherein an analog dimming end and a digital dimming end are arranged in the constant current driving unit; the method specifically comprises the following steps:
s1: the micro-control unit receives an input signal,
s2: the micro-control unit is configured to receive an input signal,
a corresponding PWM control signal is sent to a digital dimming end of the controlled switch unit and the constant current driving unit,
a corresponding analog control signal is sent to an analog dimming end of the constant current driving unit,
s3: a constant-current driving unit,
determining the output value of the constant current driving unit according to the corresponding instruction received by the analog dimming end,
determining an effective output period of an output value of the constant current driving unit according to a corresponding instruction received by the digital dimming end;
s4: the constant current driving unit with determined output value and corresponding effective output period is combined with the controlled switching unit controlled by the PWM signal to complete the driving of the LED load unit;
According to the constant-current driving method for the automobile signal lamp, logic control for responding to the automobile daytime running lamp, the position lamp and the steering lamp according to regulations is established through one-path constant-current driving through the steps.
Wherein,
the driving method provides an analog source for outputting an analog control signal by the micro control unit through the set analog signal acquisition unit.
Or alternatively, the first and second heat exchangers may be,
the analog control signal in step S2 is formed by the micro control unit executing its own corresponding program according to the input signal.
Wherein,
the LED load units comprise a first LED load unit for lighting a daytime running light or a position light and a second LED load unit for lighting a steering light;
in response to this, the control unit,
the controlled switch unit comprises a first controlled switch unit and a second controlled switch unit,
the first controlled switching unit is connected with a first LED load unit,
the second controlled switching unit is connected with a second LED load unit,
the micro control unit is connected to the digital dimming end of the constant current driving unit through the set PWM signal output end;
corresponding first PWM signal control ends and second PWM signal control ends are arranged according to the first controlled switch unit and the second controlled switch unit, and the first PWM signal control ends or the second PWM signal control ends are homologous to PWM signal output ends of digital dimming ends connected to the constant current drive units;
The analog signal acquisition units comprise a first analog signal acquisition unit corresponding to the lighting of the daytime running light or the lighting of the position light and a second analog signal acquisition unit corresponding to the lighting of the steering light;
according to the driving method, the daytime running lights, the position lights and the steering lights for the vehicle can be respectively lightened according to the requirements; as shown in fig. 7:
s11: the micro control unit receives an input signal;
when the input signal is a daytime running light, the step S12 is entered;
when the input signal is a position light, the step S13 is entered;
when the input signal is a turn signal, the step S14 is entered;
s12: the micro control unit reads the analog quantity information of the first analog signal acquisition unit and sends corresponding analog control instructions to the analog dimming end of the constant current driving unit according to the reading,
the micro control unit outputs a PWM control signal with the duty ratio of 100% to the digital dimming ends of the first controlled switch unit and the constant current driving unit according to the input signal,
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes the lighting of the daytime running lights of the LED load units together by combining the switching control established by the current first controlled switching unit according to the received PWM signals;
S13: the micro control unit reads the analog quantity information of the first analog signal acquisition unit and sends corresponding analog control instructions to the analog dimming end of the constant current driving unit according to the reading,
the micro control unit outputs PWM control signals with the duty ratio of N% to the digital dimming ends of the first controlled switch unit and the constant current driving unit according to the input signals, N epsilon (0, 100),
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes the position lamp lighting of the LED load unit together by combining the switch control established by the current first controlled switch unit according to the received PWM signals;
s14: the micro control unit reads the analog quantity information of the second analog signal acquisition unit and issues corresponding analog control instructions to the analog dimming end of the constant current driving unit according to the reading,
the micro control unit outputs a PWM control signal with the duty ratio of 100% to the digital dimming end of the second controlled switch unit and the constant current driving unit according to the input signal,
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes turning-on of the LED load units by combining switch control established by the current second controlled switch unit according to the received PWM signals.
Wherein,
the LED load units comprise a first LED load unit for lighting a daytime running light or a position light and a second LED load unit for lighting a steering light;
in response to this, the control unit,
the controlled switch unit comprises a first controlled switch unit and a second controlled switch unit,
the first controlled switching unit is connected with a first LED load unit,
the second controlled switching unit is connected with a second LED load unit,
the micro control unit is connected to the digital dimming end of the constant current driving unit through the set PWM signal output end;
corresponding first PWM signal control ends and second PWM signal control ends are arranged according to the first controlled switch unit and the second controlled switch unit, and the first PWM signal control ends or the second PWM signal control ends are homologous to PWM signal output ends of digital dimming ends connected to the constant current drive units;
the analog signal acquisition units comprise a first analog signal acquisition unit corresponding to the lighting of the daytime running light or the lighting of the position light and a second analog signal acquisition unit corresponding to the lighting of the steering light;
according to the driving method, the situation of respectively lighting the daytime running lights, the position lights and the steering lights for the vehicle according to the requirement of the regulations and simultaneously lighting the lights can be established by the following steps, as shown in fig. 8:
S21: the micro control unit receives an input signal;
when the input signal is a daytime running light, the step S22 is entered;
when the input signal is a position light, the step S23 is entered;
when the input signal is a turn signal lamp and the position lamp are required to be turned off, the step S24 is performed;
when the input signal is a turn signal lamp and the daytime running light is required to be switched to a position lamp, the step S25 is entered;
s22: the micro control unit reads the analog quantity information of the first analog signal acquisition unit and sends corresponding analog control instructions to the analog dimming end of the constant current driving unit according to the reading,
the micro control unit outputs a PWM control signal with the duty ratio of 100% to the digital dimming ends of the first controlled switch unit and the constant current driving unit according to the input signal,
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes the lighting of the daytime running lights of the LED load units together by combining the switching control established by the current first controlled switching unit according to the received PWM signals;
s23: the micro control unit reads the analog quantity information of the first analog signal acquisition unit and sends corresponding analog control instructions to the analog dimming end of the constant current driving unit according to the reading,
The micro control unit outputs PWM control signals with the duty ratio of N% to the digital dimming ends of the first controlled switch unit and the constant current driving unit according to the input signals, N epsilon (0, 100),
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes the position lamp lighting of the LED load unit together by combining the switch control established by the current first controlled switch unit according to the received PWM signals;
s24: the micro control unit reads the analog quantity information of the second analog signal acquisition unit and issues corresponding analog control instructions to the analog dimming end of the constant current driving unit according to the reading,
the micro control unit outputs a PWM control signal with a duty ratio of M% to the digital dimming end of the second controlled switch unit and the constant current driving unit according to the input signal, the intersection of M and N in the PWM of one period is an empty set in time,
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes turning-on of the LED load units by combining switch control established by the current second controlled switch unit according to the received PWM signals;
S25: in the time with the duty ratio of N%, the micro-control unit reads the analog quantity information of the first analog signal acquisition unit, and sends corresponding analog control instructions to the analog dimming end of the constant current driving unit according to the reading, meanwhile, the micro-control unit outputs PWM control signals with the duty ratio of N% to the digital dimming ends of the first controlled switching unit and the constant current driving unit, N epsilon (0, 100),
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes the position lamp lighting of the LED load unit together by combining the switch control established by the current first controlled switch unit according to the received PWM signals;
in the time with the duty ratio of M%, the micro control unit reads analog quantity information of the second analog signal acquisition unit, and sends corresponding analog control instructions to an analog dimming end of the constant current driving unit according to the reading, meanwhile, the micro control unit outputs PWM control signals with the duty ratio of M% to a second controlled switch unit and a digital dimming end of the constant current driving unit, and the intersection of M and N in the PWM of one period in time is a null set;
and the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes turning-on of the LED load unit by combining switch control established by the current second high-end light-on unit according to the received PWM signals.
Wherein,
the LED load units comprise a first LED load unit for lighting a daytime running light or a position light and a second LED load unit for lighting a steering light;
in response to this, the control unit,
the controlled switch unit comprises a first controlled switch unit and a second controlled switch unit,
the first controlled switching unit is connected with a first LED load unit,
the second controlled switching unit is connected with a second LED load unit,
the micro control unit is connected to the digital dimming end of the constant current driving unit through the set PWM signal output end;
corresponding first PWM signal control ends and second PWM signal control ends are arranged according to the first controlled switch unit and the second controlled switch unit, and the first PWM signal control ends or the second PWM signal control ends are homologous to PWM signal output ends of digital dimming ends connected to the constant current drive units;
the analog control signal output by the micro control unit includes:
a first analog control signal corresponding to the current value of the daytime running light or position light,
A second analog control signal corresponding to the turn signal current value;
according to the driving method, the daytime running lights, the position lights and the turn lights for the vehicle can be respectively lightened according to the requirements by the following steps of:
S31: the micro control unit receives an input signal;
when the input signal is a daytime running light, the step S12 is entered;
when the input signal is a position light, the step S13 is entered;
when the input signal is a turn signal, the step S14 is entered;
s32: the micro control unit outputs a first analog control signal to an analog dimming end of the constant current driving unit,
the micro control unit outputs a PWM control signal with the duty ratio of 100% to the digital dimming ends of the first controlled switch unit and the constant current driving unit according to the input signal,
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes the lighting of the daytime running lights of the LED load units together by combining the switching control established by the current first controlled switching unit according to the received PWM signals;
s33: the micro control unit outputs a first analog control signal to an analog dimming end of the constant current driving unit,
the micro control unit outputs PWM control signals with the duty ratio of N% to the digital dimming ends of the first controlled switch unit and the constant current driving unit according to the input signals, N epsilon (0, 100),
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes the position lamp lighting of the LED load unit together by combining the switch control established by the current first controlled switch unit according to the received PWM signals;
S34: the micro control unit outputs a second analog control signal to the analog dimming end of the constant current driving unit,
the micro control unit outputs a PWM control signal with the duty ratio of 100% to the digital dimming end of the second controlled switch unit and the constant current driving unit according to the input signal,
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes turning-on of the LED load units by combining switch control established by the current second controlled switch unit according to the received PWM signals.
Wherein,
the LED load units comprise a first LED load unit for lighting a daytime running light or a position light and a second LED load unit for lighting a steering light;
in response to this, the control unit,
the controlled switch unit comprises a first controlled switch unit and a second controlled switch unit,
the first controlled switching unit is connected with a first LED load unit,
the second controlled switching unit is connected with a second LED load unit,
the micro control unit is connected to the digital dimming end of the constant current driving unit through the set PWM signal output end;
corresponding first PWM signal control ends and second PWM signal control ends are arranged according to the first controlled switch unit and the second controlled switch unit, and the first PWM signal control ends or the second PWM signal control ends are homologous to PWM signal output ends of digital dimming ends connected to the constant current drive units;
The analog control signal output by the micro control unit includes:
a first analog control signal corresponding to the current value of the daytime running light or position light,
A second analog control signal corresponding to the turn signal current value;
according to the driving method, the situation of respectively lighting the daytime running lights, the position lights and the steering lights for the vehicle according to the requirement of the regulations and simultaneously lighting the lights can be established by the following steps, as shown in fig. 10:
s41: the micro control unit receives an input signal;
when the input signal is a daytime running light, the step S22 is entered;
when the input signal is a position light, the step S23 is entered;
when the input signal is a turn signal lamp and the position lamp are required to be turned off, the step S24 is performed;
when the input signal is a turn signal lamp and the daytime running light is required to be switched to a position lamp, the step S25 is entered;
s42: the micro control unit outputs a first analog control signal to an analog dimming end of the constant current driving unit,
the micro control unit outputs a PWM control signal with the duty ratio of 100% to the digital dimming ends of the first controlled switch unit and the constant current driving unit according to the input signal,
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes the lighting of the daytime running lights of the LED load units together by combining the switching control established by the current first controlled switching unit according to the received PWM signals;
S43: the micro control unit outputs a first analog control signal to an analog dimming end of the constant current driving unit,
the micro control unit outputs PWM control signals with the duty ratio of N% to the digital dimming ends of the first controlled switch unit and the constant current driving unit according to the input signals, N epsilon (0, 100),
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes the position lamp lighting of the LED load unit together by combining the switch control established by the current first controlled switch unit according to the received PWM signals;
s44: the micro control unit outputs a second analog control signal to the analog dimming end of the constant current driving unit,
the micro control unit outputs a PWM control signal with a duty ratio of M% to the digital dimming end of the second controlled switch unit and the constant current driving unit according to the input signal, the intersection of M and N in the PWM of one period is an empty set in time,
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes turning-on of the LED load units by combining switch control established by the current second controlled switch unit according to the received PWM signals;
S45: in the time with the duty ratio of N%, the micro control unit outputs a first analog control signal to the analog dimming end of the constant current driving unit, and simultaneously outputs a PWM control signal with the duty ratio of N% to the first controlled switching unit and the digital dimming end of the constant current driving unit, N E (0, 100),
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes the position lamp lighting of the LED load unit together by combining the switch control established by the current first controlled switch unit according to the received PWM signals;
in the time with the duty ratio of M%, the micro control unit outputs a second analog control signal to an analog dimming end of the constant current driving unit, and simultaneously outputs a PWM control signal with the duty ratio of M% to a second controlled switching unit and a digital dimming end of the constant current driving unit, wherein the intersection of M and N in the PWM of one period in time is a null set;
and the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes turning-on of the LED load unit by combining switch control established by the current second high-end light-on unit according to the received PWM signals.
Wherein,
m=100-N, i.e.: m and N form a PWM cycle.
Wherein,
after the micro control unit receives the input signal, the micro control unit and the constant current unit perform safety control supervision through the safety control unit before finishing output;
the safety control unit sends the current value monitored in real time to the micro control unit, and the micro control unit sends corresponding control instructions according to the read and comparison with the set safety threshold value;
when the current value read by the micro control unit is greater than or equal to a set safety threshold value, the micro control unit issues a turn-off instruction to the constant current driving unit and the controlled switch unit;
when the current value read by the micro control unit is smaller than the safety threshold value, the step S2 is entered.
Wherein,
the safety control unit is used for establishing safety monitoring when the environmental temperature is too high;
or to establish safety monitoring in both situations when the ambient temperature is too high or when the analog control quantity exceeds a safety threshold.
Wherein,
in the micro control unit, the analog signal instruction output end is shared with any one of the ports for receiving the first analog signal acquisition unit or the second analog signal acquisition unit.
Wherein,
and the controlled switching unit combines the driving current output according to the received PWM control signal to form high-end driving or low-end driving of the LED load unit.
Working principles and examples
The invention will be described in further detail with reference to the drawings and the specific examples,
the above-mentioned micro control unit corresponds to a microcontroller in the following embodiments,
the constant current driving unit mentioned above corresponds to the LED constant current driving in the following embodiments,
the above mentioned input signals are specifically characterized by the input 1 signal, the input 2 signal, the input 3 signal in the following embodiments, respectively;
the first controlled switching unit mentioned above corresponds to the controlled switching unit 1 in the following embodiment;
the first analog signal acquisition unit mentioned above corresponds to the analog dimming sampling module 1 in the following embodiment 1;
the first LED load unit mentioned above corresponds to the LED1 in the following embodiment;
the above-mentioned second safety control unit is specifically characterized by the temperature protection module 1 and the temperature protection module 2 in the following embodiments;
the second controlled switching unit mentioned above corresponds to the controlled switching unit 2 in the following embodiment;
the above-mentioned second analog signal acquisition unit corresponds to the analog dimming sampling module 2 in the following embodiment 1;
The above-mentioned second LED load unit corresponds to the LED2 in the following embodiment;
m=100-N in this embodiment, namely: m and N form a PWM cycle, and the intersection of the two over a cycle is empty.
Example 1
In this embodiment, an analog signal acquisition unit is set as an example;
the combined signal lamp of the invention can be a combination of a daytime running light, a position light and a turn signal light, wherein the daytime running light and the position light share one LED light source. A combination of a brake light, a tail light and a turn light is also possible, wherein the brake light and the tail light share one LED light source, as shown in fig. 11.
In this embodiment, a high-end connection mode from constant current driving to an LED load is adopted as an example of the controlled switch unit (the technical scheme of the present invention may also adopt a low-end connection mode for the controlled switch, the structural schematic diagram of which is shown in fig. 12), the power supply input is for supplying power to the constant current driving module, the input signals of the Daytime Running Light (DRL), the Position Light (PL) and the turning light (FTL) are connected to the signal input port of the microprocessor, the microprocessor collects the input signals of the daytime running light, the position light and the turning light, and selects different dimming modes to drive the first LED light source and the second LED light source to be turned on or off.
The analog dimming sampling module can set different parameters according to different LED loads, and can obtain different current outputs. The analog dimming sampling module 1 corresponds to analog dimming of the first LED light source, the analog dimming sampling module 2 corresponds to analog dimming of the second LED light source, the microprocessor reads voltage values of the two sampling modules, outputs an analog dimming signal to an analog dimming port of the LED constant current driving module through an analog-to-digital conversion port after processing, and the LED constant current driving module outputs corresponding driving current to the first LED light source or the second LED light source.
The output of the controlled switch unit 1 and the controlled switch unit 2 can be switched by reading the input signals of each signal lamp by the microprocessor, and the output modes are 3: (1) 100% duty cycle output, the switching circuit is always on; (2) 1% -99% of adjustable duty ratio output, and the switching circuit is continuously switched with adjustable frequency and duty ratio; (3) 0% duty cycle output, i.e., switching circuit is always off.
The LED in this embodiment is driven constant current,
determining the output value of the constant current drive according to the corresponding instruction received by the analog dimming end,
and determining the effective output period of the output value of the constant current drive according to the corresponding instruction received by the digital dimming terminal.
1, when the microprocessor reads the input of the daytime running light power supply signal, the output control signal controls the controlled switch unit 1 to be in a conducting state all the time, and the microprocessor outputs the obtained current signal to the LED constant current driving module through analysis and calculation by reading the voltage value of the analog dimming sampling module 1 to drive the first LED light source to work, so that the daytime running light is lighted.
And 2, when the microprocessor reads the power signal input of the position lamp, the microprocessor outputs a PWM digital dimming signal with the duty ratio of N% to the constant current driving module, and simultaneously controls the controlled switch unit 1 to continuously switch on and off, and simultaneously, the microprocessor reads the voltage value of the analog dimming sampling module, and outputs the voltage value to the LED constant current driving module after analysis and calculation, and the LED constant current driving module outputs corresponding driving current to drive the first LED light source to work when the switch circuit is turned on, so that the position lamp is lighted.
3, when the microprocessor reads the power signal input of the turn signal lamp, two conditions exist according to different regulations:
if the daytime running light and the position light are required to be turned off, the microprocessor outputs a control signal to control the controlled switch unit 1 to be turned off, meanwhile, the microprocessor reads the voltage value of the analog dimming sampling module 2, obtains corresponding output current through calculation, outputs an analog dimming signal for controlling the steering light to the LED constant current driving module, and the LED constant current driving module drives the second LED light source to work to turn on the steering light.
If the daytime running light is required to be switched into a position light, the microprocessor outputs a PWM signal with the duty ratio of N% to the controlled switch unit 1, outputs a PWM signal with the duty ratio of M% to the controlled switch unit 2, reads the voltage value of the analog dimming sampling module 1, calculates and outputs the calculated voltage value to the LED constant current driving module; the voltage value of the analog dimming sampling module 2 is read, calculated and processed and then output to the LED constant current driving module, the constant current driving module transmits corresponding driving current to the first LED light source in the on period of the controlled switch unit 1, and transmits corresponding driving current to the second LED light source in the on period of the controlled switch unit 2, because the intersection of M and N in the PWM of one period is an empty set, namely, the controlled switch unit 2 is disconnected when the controlled switch unit 1 is turned on, or the controlled switch unit 1 is disconnected when the controlled switch unit 2 is turned on; therefore, mutual exclusion lighting is achieved, and meanwhile, as the time is within the time which can be distinguished by human eyes, the steering lamp and the position lamp are finally displayed to be simultaneously lighted; as for the frequency, setting of more than hundred hertz can form corresponding support.
At any moment, when the voltage value read by the microprocessor from the analog dimming sampling module or the temperature protection sampling module exceeds the safety range, the microprocessor immediately controls the controlled switch unit 1 or the controlled switch unit 2 to be turned off, simultaneously turns off the LED constant current driving module, periodically reads the voltage values of the analog dimming sampling module and the temperature protection sampling module until the read voltage values are in the safety voltage range, and then starts the driving system to realize self protection and prevent accidents.
Example 2
In this embodiment, an analog signal acquisition unit is not provided as an example;
the combined signal lamp of the invention can be a combination of a daytime running light, a position light and a turn signal light, wherein the daytime running light and the position light share one LED light source. Or a combination of a brake light, a tail light and a turn light, wherein the brake light and the tail light share one LED light source, as shown in fig. 13.
In this embodiment, a high-end connection mode from constant current driving to an LED load is adopted as an example of the controlled switch unit (the technical scheme of the present invention may also adopt a low-end connection mode for the controlled switch, the structural schematic diagram of which is shown in fig. 14), the power supply input is for supplying power to the constant current driving module, the input signals of the Daytime Running Light (DRL), the Position Light (PL) and the turning light (FTL) are connected to the signal input port of the microprocessor, the microprocessor collects the input signals of the daytime running light, the position light and the turning light, and selects different dimming modes to drive the first LED light source and the second LED light source to be turned on or off.
Different current outputs can be obtained by arranging the micro control unit. And outputting different analog dimming signals to an analog dimming port of the LED constant current driving module through the analog-to-digital conversion port, and outputting corresponding driving current to the first LED light source or the second LED light source by the LED constant current driving module.
The output of the controlled switch unit 1 and the controlled switch unit 2 can be switched by reading the input signals of each signal lamp by the microprocessor, and the output modes are 3: (1) 100% duty cycle output, the switching circuit is always on; (2) 1% -99% of adjustable duty ratio output, and the switching circuit is continuously switched with adjustable frequency and duty ratio; (3) 0% duty cycle output, i.e., switching circuit is always off.
The LED in this embodiment is driven constant current,
determining the output value of the constant current drive according to the corresponding instruction received by the analog dimming end,
and determining the effective output period of the output value of the constant current drive according to the corresponding instruction received by the digital dimming terminal.
1, when the microprocessor reads the input of the daytime running light power supply signal, the output control signal controls the controlled switch unit 1 to be in a conducting state all the time, and meanwhile, the corresponding current signal is output to the LED constant current driving module to drive the first LED light source to work, and the daytime running light is lighted.
2, when the microprocessor reads the power signal input of the position lamp, the microprocessor outputs a PWM digital dimming signal with the duty ratio of N% to the constant current driving module, simultaneously controls the controlled switch unit 1 to continuously switch on and off, and simultaneously outputs corresponding current to the LED constant current driving module, the LED constant current driving module outputs corresponding driving current to drive the first LED light source to work when the switch circuit is conducted, and the position lamp is lighted.
3, when the microprocessor reads the power signal input of the turn signal lamp, two conditions exist according to different regulations:
if the daytime running light and the position light are required to be turned off, the microprocessor outputs a control signal to control the controlled switch unit 1 to be turned off, and meanwhile, the microprocessor outputs an analog dimming signal for controlling the steering light to the LED constant current driving module, and the LED constant current driving module drives the second LED light source to work, so that the steering light is turned on.
If the daytime running light is required to be switched to a position light, the microprocessor outputs a PWM signal with the duty ratio of N% to the controlled switch unit 1, and outputs a current signal corresponding to the first LED light source to the constant current drive unit in the period; outputting a PWM signal with a duty ratio of M% to the controlled switching unit 2, and outputting a current signal corresponding to the second LED light source to the constant current driving unit in the period; the constant current driving module transmits corresponding driving current to the first LED light source during the on period of the controlled switch unit 1, and transmits corresponding driving current to the second LED light source during the on period of the controlled switch unit 2, because the intersection of M and N in PWM of one period is empty, namely, the controlled switch unit 2 is disconnected when the controlled switch unit 1 is on, or the controlled switch unit 1 is disconnected when the controlled switch unit 2 is on; therefore, mutual exclusion lighting is achieved, and meanwhile, as the time is within the time which can be distinguished by human eyes, the steering lamp and the position lamp are finally displayed to be simultaneously lighted; as for the frequency, setting of more than hundred hertz can form corresponding support.
At any moment, when the voltage value read by the microprocessor from the temperature protection sampling module exceeds the safety range, the microprocessor immediately controls the controlled switch unit 1 or the controlled switch unit 2 to be turned off, simultaneously turns off the LED constant current driving module, periodically reads the voltage value of the temperature protection sampling module until the read voltage value is within the safety voltage range, and then starts the driving system to realize self protection and prevent accidents.
The specific logic timing diagram is shown in fig. 15. The basic logic relationship of input and output under the normal operation of the control module is shown in table 1.
Table 1:
| DRL INPUT | PL INPUT | TURN INPUT | DRL/PL OUTPUT | TURN OUTPUT |
| L | L | L | L | L |
| H | L | L | H | L |
| L | H | L | N％PWM | L |
| H | H | L | N％PWM | L |
| L | L | H | L | M％PWM |
| H | L | H | N％PWM/L | M％PWM |
| L | H | H | N％PWM/L | M％PWM |
| H | H | H | N％PWM/L | M％PWM |
note that:
(1) The INPUT signals all represent INPUT signals to the microcontroller, L represents a DC low level, and H represents a DC high level.
(2) The life-style switching lamp is typically operated in a blinking state with a low frequency, so the TURN effective input signal is typically 1 Hz-1.5 Hz, a 50% duty cycle PWM, and the output signal is theoretically also a PWM that is in step with the input.
(3) The PL normal working state output is PWM with a duty ratio of N%, the brightness is far lower than that of the DRL output, and because the DRL and the PL share one path of LED load, when the PL input signal is valid, the LED output state is low-brightness PL no matter the DRL input signal.
(4) When the DRL/PL load works and the turn signal lamp works, no matter the DRL/PL load is in the DRL state or the PL state, the DRL/PL load is switched to the off state or the PL is lighted when the turn signal lamp is lighted according to different legal requirements, and the sequential logic diagram 9 only takes the DRL/PL load is switched to the PL state when the turn signal lamp input is valid as an example. The output of the turn signal lamp may be set to a full period dc output or PWM with a duty cycle of M% according to different regulatory requirements, and table 1 only lists the cases where the turn signal lamp is turned on with an output duty cycle of M% PWM.
According to the constant current driving system for the automobile signal lamp and the driving method thereof, the principle of mutually exclusive lighting (namely, when PWM control is based on N% duty ratio and M% duty ratio in the text, the intersection of M and N in the PWM of one period is an empty set) is utilized to realize the corresponding logic switching function by sharing one LED constant current driving, normal work of each signal lamp is realized, and the working logic required by different regulations can be flexibly met; the cost of the automobile signal lamp driving module and the size of the module are greatly reduced; when the steering lamp is turned on, no matter whether the daytime running lamp and the position lamp are required to be turned off at the moment or the daytime running lamp is required to be converted into the position lamp, the system and the corresponding driving method provided by the invention can be realized; the analog control signal used for determining the output value of the constant current driving unit can be provided by a corresponding circuit of the peripheral equipment or can be built by a program in the microcontroller, so that flexible transformation space is provided for adaptation of different situations; and a safety control mechanism of the system is established for monitoring the situation when the voltage value of the analog control signal read by the micro control and the temperature protection module exceeds a safety threshold value.
Claims (20)
1. A constant current driving system for an automobile signal lamp drives an LED load unit which is lighted through a set constant current driving unit to form a response to the current driving requirement, which is characterized in that:
the constant current driving unit is arranged for constant current driving with adjustable output current;
an analog dimming end and a digital dimming end are arranged in the constant current driving unit;
a micro control unit and a controlled switch unit are also arranged in the system; the micro-control unit is used for controlling the micro-control unit,
on the one hand, according to the received input signal, an analog control signal is output to an analog dimming end of the constant current driving unit,
on the other hand, according to the received input signals, corresponding PWM signals are output to a digital dimming end of the constant current driving unit and the controlled switch unit;
the constant-current driving unit is provided with a constant-current driving circuit,
determining the output value of the constant current driving unit according to the corresponding instruction received by the analog dimming end,
determining an effective output period of an output value of the constant current driving unit according to a corresponding instruction received by the digital dimming end;
the constant current driving unit with determined output value and corresponding effective output period is combined with the controlled switching unit controlled by PWM signals to realize the logic control of the response of the daytime running light, the position light and the steering light of the vehicle according to regulations through one path of constant current driving;
When the control circuit is used for controlling the lighting of the daytime running light, the PWM signal is output as a 100% duty ratio signal;
when used for controlling to light a position lamp, the output PWM signal is an N% duty cycle signal, N epsilon (0, 100);
when the control signal is used for controlling to light the turn signal, the output PWM signal is a 100% duty cycle signal, or when the control signal is used for controlling to light the turn signal, the output PWM signal is an M% duty cycle signal, and at the moment, M=100-N, and the intersection of M and N in the PWM of one period in time is an empty set.
2. The constant current driving system for an automotive signal lamp according to claim 1, wherein:
an analog signal acquisition unit is also arranged in the system,
the analog signal acquisition unit is used for providing an analog source for outputting an analog control signal by the micro control unit.
3. The constant current driving system for an automotive signal lamp according to claim 1, wherein:
the analog control signal output to the analog dimming end of the constant current driving unit is formed by executing a corresponding program of the micro control unit according to the input signal.
4. The constant current driving system for an automotive signal lamp according to claim 2, wherein:
the LED load unit comprises a first LED load unit and a second LED load unit;
The first LED load unit corresponds to a daytime running light or a position light;
the second LED load unit corresponds to the turn light;
in response to this, the control unit,
the controlled switching unit is configured to:
a first controlled switch unit corresponding to the first LED load unit,
A second controlled switching unit corresponding to the second LED load unit;
the PWM signal comprises:
a first PWM signal corresponding to the lighting of the daytime running light,
A second PWM signal for lighting the corresponding position lamp,
A third PWM signal corresponding to the turning-on of the turn signal;
the analog signal acquisition unit includes:
a first analog signal acquisition unit corresponding to the current value of the daytime running light or the position light,
And the second analog signal acquisition unit corresponds to the current value of the steering lamp.
5. A constant current driving system for an automotive signal lamp according to claim 3, wherein:
the LED load unit comprises a first LED load unit and a second LED load unit;
the first LED load unit corresponds to a daytime running light or a position light;
the second LED load unit corresponds to the turn light;
in response to this, the control unit,
the controlled switching unit is configured to:
a first controlled switch unit corresponding to the first LED load unit,
A second controlled switching unit corresponding to the second LED load unit;
The PWM signal comprises:
a first PWM signal corresponding to the lighting of the daytime running light,
A second PWM signal for lighting the corresponding position lamp,
A third PWM signal corresponding to the turning-on of the turn signal;
the analog control signal output by the micro control unit includes:
a first analog control signal corresponding to the current value of the daytime running light or position light,
And a second analog control signal corresponding to the turn signal current value.
6. The constant current driving system for an automotive signal lamp according to claim 1, wherein:
the constant current driving unit, the micro control unit and the controlled switching unit form high-end driving or low-end driving of the LED load unit.
7. The constant current driving system for an automotive signal lamp according to claim 1, wherein:
the constant current driving system is also provided with a first safety control unit,
the first safety control unit is used for monitoring the analog signals received by the micro control unit in real time,
and when the analog signal is monitored to exceed the safety threshold, the micro control unit sends out an instruction for switching off the controlled switching unit and the constant current driving unit.
8. The constant current driving system for an automotive signal lamp according to claim 1 or 7, wherein:
And a second safety control unit is further arranged on the constant current driving system, monitors the current environment temperature in real time, notifies the micro control unit when the temperature exceeds a safety threshold value, and turns off the controlled switch unit and the constant current driving unit according to the received notification.
9. The constant current driving system for an automotive signal lamp according to claim 4, wherein:
in the micro control unit, an analog control signal output port is shared with any one of the ports for receiving the first analog signal acquisition unit or the second analog signal acquisition unit.
10. The constant current driving system for an automotive signal lamp according to claim 2, wherein:
the analog signal acquisition unit is composed of a resistor and a corresponding voltage stabilizing source.
11. The constant current driving system for an automotive signal lamp according to claim 1, wherein:
the constant current driving system can also be used for the lighting of brake lamps, tail lamps and turn lamps,
the constant current driving unit with determined output value and corresponding effective output period is combined with the controlled switching unit controlled by PWM signals to realize the logic control of the response of the brake lamp, the tail lamp and the steering lamp of the vehicle according to regulations through one path of constant current driving.
12. The constant current driving method for the automobile signal lamp is characterized in that the LED load unit is lightened through the set constant current driving unit to respond to the lighting requirements of the daytime running light, the position light and the turn light for the automobile, and the constant current driving method is characterized in that:
the driving method is completed by a micro control unit, a controlled switch unit and a matched constant current driving unit, wherein an analog dimming end and a digital dimming end are arranged in the constant current driving unit; the method specifically comprises the following steps:
s1: the micro-control unit receives an input signal,
s2: the micro-control unit is configured to receive an input signal,
a corresponding PWM control signal is sent to a digital dimming end of the controlled switch unit and the constant current driving unit,
a corresponding analog control signal is sent to an analog dimming end of the constant current driving unit,
s3: a constant-current driving unit,
determining the output value of the constant current driving unit according to the corresponding instruction received by the analog dimming end,
determining an effective output period of an output value of the constant current driving unit according to a corresponding instruction received by the digital dimming end;
s4: the constant current driving unit with determined output value and corresponding effective output period is combined with the controlled switching unit controlled by the PWM signal to complete the driving of the LED load unit;
According to the constant-current driving method for the automobile signal lamp, logic control for responding to the automobile daytime running lamp, the position lamp and the steering lamp according to regulations is established through one-path constant-current driving through the steps;
the LED load units comprise a first LED load unit for lighting a daytime running light or a position light and a second LED load unit for lighting a steering light;
in response to this, the control unit,
the controlled switch unit comprises a first controlled switch unit and a second controlled switch unit,
the first controlled switching unit is connected with a first LED load unit,
the second controlled switching unit is connected with a second LED load unit,
the micro control unit is connected to the digital dimming end of the constant current driving unit through the set PWM signal output end;
corresponding first PWM signal control ends and second PWM signal control ends are arranged according to the first controlled switch unit and the second controlled switch unit, and the first PWM signal control ends or the second PWM signal control ends are homologous to PWM signal output ends of digital dimming ends connected to the constant current drive units;
the analog control signal output by the micro control unit includes:
a first analog control signal corresponding to the current value of the daytime running light or position light,
A second analog control signal corresponding to the turn signal current value;
according to the driving method, the daytime running lights, the position lights and the steering lights for the vehicle can be respectively lightened according to the requirements through the following steps:
s11: the micro control unit receives an input signal;
when the input signal is a daytime running light, the step S12 is entered;
when the input signal is a position light, the step S13 is entered;
when the input signal is a turn signal, the step S14 is entered;
s12: the micro control unit reads the analog quantity information of the first analog signal acquisition unit and sends corresponding analog control instructions to the analog dimming end of the constant current driving unit according to the reading,
the micro control unit outputs a PWM control signal with the duty ratio of 100% to the digital dimming ends of the first controlled switch unit and the constant current driving unit according to the input signal,
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes the lighting of the daytime running lights of the LED load units together by combining the switching control established by the current first controlled switching unit according to the received PWM signals;
s13: the micro control unit reads the analog quantity information of the first analog signal acquisition unit and sends corresponding analog control instructions to the analog dimming end of the constant current driving unit according to the reading,
The micro control unit outputs PWM control signals with the duty ratio of N% to the digital dimming ends of the first controlled switch unit and the constant current driving unit according to the input signals, N epsilon (0, 100),
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes the position lamp lighting of the LED load unit together by combining the switch control established by the current first controlled switch unit according to the received PWM signals;
s14: the micro control unit reads the analog quantity information of the second analog signal acquisition unit and issues corresponding analog control instructions to the analog dimming end of the constant current driving unit according to the reading,
the micro control unit outputs a PWM control signal with the duty ratio of 100% to the digital dimming end of the second controlled switch unit and the constant current driving unit according to the input signal,
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes turning-on of the LED load units by combining switch control established by the current second controlled switch unit according to the received PWM signals;
Or alternatively, the first and second heat exchangers may be,
according to the driving method, the situation that the sun lamp, the position lamp and the steering lamp for the vehicle are respectively lightened according to the requirement of the regulations and simultaneously lightened can be established by the following steps:
s21: the micro control unit receives an input signal;
when the input signal is a daytime running light, the step S22 is entered;
when the input signal is a position light, the step S23 is entered;
when the input signal is a turn signal lamp and the position lamp are required to be turned off, the step S24 is performed;
when the input signal is a turn signal lamp and the daytime running light is required to be switched to a position lamp, the step S25 is entered;
s22: the micro control unit reads the analog quantity information of the first analog signal acquisition unit and sends corresponding analog control instructions to the analog dimming end of the constant current driving unit according to the reading,
the micro control unit outputs a PWM control signal with the duty ratio of 100% to the digital dimming ends of the first controlled switch unit and the constant current driving unit according to the input signal,
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes the lighting of the daytime running lights of the LED load units together by combining the switching control established by the current first controlled switching unit according to the received PWM signals;
S23: the micro control unit reads the analog quantity information of the first analog signal acquisition unit and sends corresponding analog control instructions to the analog dimming end of the constant current driving unit according to the reading,
the micro control unit outputs PWM control signals with the duty ratio of N% to the digital dimming ends of the first controlled switch unit and the constant current driving unit according to the input signals, N epsilon (0, 100),
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes the position lamp lighting of the LED load unit together by combining the switch control established by the current first controlled switch unit according to the received PWM signals;
s24: the micro control unit reads the analog quantity information of the second analog signal acquisition unit and issues corresponding analog control instructions to the analog dimming end of the constant current driving unit according to the reading,
the micro control unit outputs a PWM control signal with a duty ratio of M% to the digital dimming end of the second controlled switch unit and the constant current driving unit according to the input signal, the intersection of M and N in the PWM of one period is an empty set in time,
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes turning-on of the LED load units by combining switch control established by the current second controlled switch unit according to the received PWM signals;
S25: in the time with the duty ratio of N%, the micro-control unit reads the analog quantity information of the first analog signal acquisition unit, and sends corresponding analog control instructions to the analog dimming end of the constant current driving unit according to the reading, meanwhile, the micro-control unit outputs PWM control signals with the duty ratio of N% to the digital dimming ends of the first controlled switching unit and the constant current driving unit, N epsilon (0, 100),
the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes the position lamp lighting of the LED load unit together by combining the switch control established by the current first controlled switch unit according to the received PWM signals;
in the time with the duty ratio of M%, the micro control unit reads analog quantity information of the second analog signal acquisition unit, and sends corresponding analog control instructions to an analog dimming end of the constant current driving unit according to the reading, and meanwhile, the micro control unit outputs PWM control signals with the duty ratio of M% to a digital dimming end of the second controlled switching unit and the constant current driving unit, wherein M=100-N;
and the constant current driving unit respectively establishes output values and responses of corresponding effective output periods according to the received analog control instructions and digital dimming instructions, and completes turning-on of the LED load unit by combining switch control established by the current second high-end light-on unit according to the received PWM signals.
13. The constant current driving method for an automotive signal lamp according to claim 12, wherein:
the driving method provides an analog source for outputting an analog control signal by the micro control unit through the set analog signal acquisition unit.
14. The constant current driving method for an automotive signal lamp according to claim 12, wherein:
the analog control signal in step S2 is formed by the micro control unit executing its own corresponding program according to the input signal.
15. The constant current driving method for an automotive signal lamp according to claim 12, wherein:
after the micro control unit receives the input signal, the micro control unit and the constant current unit perform safety control supervision through the safety control unit before finishing output;
the safety control unit sends the current value monitored in real time to the micro control unit, and the micro control unit sends corresponding control instructions according to the read and comparison with the set safety threshold value;
when the current value read by the micro control unit is greater than or equal to a set safety threshold value, the micro control unit issues a turn-off instruction to the constant current driving unit and the controlled switch unit;
when the current value read by the micro control unit is smaller than the safety threshold value, the step S2 is entered.
16. The constant current driving method for an automotive signal lamp according to claim 13, wherein:
after the micro control unit receives the input signal, the micro control unit and the constant current unit perform safety control supervision through the safety control unit before finishing output;
the safety control unit sends the current value monitored in real time to the micro control unit, and the micro control unit sends corresponding control instructions according to the read and comparison with the set safety threshold value;
when the current value read by the micro control unit is greater than or equal to a set safety threshold value, the micro control unit issues a turn-off instruction to the constant current driving unit and the controlled switch unit;
when the current value read by the micro control unit is smaller than the safety threshold value, the step S2 is entered.
17. The constant current driving method for an automotive signal lamp according to claim 15, wherein:
the safety control unit is used for establishing safety monitoring when the ambient temperature is too high.
18. The constant current driving method for an automotive signal lamp according to claim 16, wherein:
the safety control unit is used for establishing safety monitoring under the conditions of over-high ambient temperature or over-high analog control quantity.
19. The constant current driving method for an automotive signal lamp according to claim 12, wherein:
in the micro control unit, the analog signal instruction output end is shared with any one of the ports for receiving the first analog signal acquisition unit or the second analog signal acquisition unit.
20. The constant current driving method for an automotive signal lamp according to claim 12, wherein:
and the controlled switching unit combines the driving current output according to the received PWM control signal to form high-end driving or low-end driving of the LED load unit.
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