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CN115942538A - Light source control method, light source control circuit deep sea lighting device and storage medium - Google Patents

Light source control method, light source control circuit deep sea lighting device and storage medium Download PDF

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Publication number
CN115942538A
CN115942538A CN202211676229.8A CN202211676229A CN115942538A CN 115942538 A CN115942538 A CN 115942538A CN 202211676229 A CN202211676229 A CN 202211676229A CN 115942538 A CN115942538 A CN 115942538A
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CN
China
Prior art keywords
light source
circuit
pin
real
power supply
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CN202211676229.8A
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Chinese (zh)
Inventor
陈亮辉
朱奕光
焦志刚
陈亮
吴钊强
冯慧锋
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Foshan Electrical and Lighting Co Ltd
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Foshan Electrical and Lighting Co Ltd
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Application filed by Foshan Electrical and Lighting Co Ltd filed Critical Foshan Electrical and Lighting Co Ltd
Priority to CN202211676229.8A priority Critical patent/CN115942538A/en
Publication of CN115942538A publication Critical patent/CN115942538A/en
Priority to PCT/CN2023/127154 priority patent/WO2024139615A1/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/56—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving measures to prevent abnormal temperature of the LEDs
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/105—Controlling the light source in response to determined parameters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

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  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

The invention discloses a light source control method, a light source control circuit deep sea lighting device and a storage medium, and relates to the technical field of deep sea lighting, wherein the method comprises the following steps: acquiring the real-time temperature of the external environment; comparing the real-time temperature with a preset reference temperature, judging whether the real-time temperature is greater than the reference temperature, when the real-time temperature is greater than the reference temperature, calculating the self-adaptive duty ratio of the target light source according to a preset reference parameter, the real-time temperature and the reference temperature, and generating a PWM signal with the duty ratio as the self-adaptive duty ratio; and controlling the power supply of the target light source according to the PWM signal. The invention can carry out the self-adaptive adjustment of the PWM signal according to the temperature of the external environment, ensure the lamp to work at the maximum allowable brightness and improve the applicability of the lamp.

Description

Light source control method, light source control circuit deep sea lighting device and storage medium
Technical Field
The invention relates to the technical field of deep sea lighting, in particular to a light source control method, a light source control circuit deep sea lighting device and a storage medium.
Background
The searchlight is an important tool for deep sea research, when deep sea searchlighting is carried out, because sunlight cannot irradiate the seabed, the seabed light is weak, and the deep sea searchlight is generally adopted for conveniently observing the surrounding situation.
The existing deep sea searchlight generally has an overheat protection function so as to ensure that the lamp can be automatically extinguished or is in a fixed low-brightness mode under the condition of overhigh temperature; however, the overheat protection function cannot intelligently adjust the brightness state of the light module according to different environmental temperatures, and when the deep sea searchlight is automatically turned off or is in a low-brightness mode, the use brightness requirement of a user cannot be met, so that smooth development of the submarine searchlight operation is seriously affected.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a light source control method, a light source control circuit deep sea lighting device and a storage medium, which can perform self-adaptive adjustment of a PWM signal according to the temperature of an external environment, ensure that a laser deep sea lamp works at the maximum allowable brightness, and improve the applicability of the lamp.
In order to solve the above technical problem, the present invention provides a light source control method, including: acquiring the real-time temperature of the external environment; comparing the real-time temperature with a preset reference temperature, when the real-time temperature is higher than the reference temperature, calculating the self-adaptive duty ratio of a target light source according to a preset reference parameter, the real-time temperature and the reference temperature, and generating a PWM signal with the duty ratio as the self-adaptive duty ratio; and controlling the power supply of the target light source according to the PWM signal.
As an improvement of the above solution, the step of calculating the adaptive duty ratio of the target light source according to the preset reference parameter, the real-time temperature and the reference temperature includes: according to the formula x = a (-△ta) And calculating the self-adaptive duty ratio x of the target light source, wherein delta ta is the difference value between the real-time temperature and the reference temperature, and a is the reference parameter of the target light source.
As an improvement of the above solution, the step of calculating the reference parameter includes: operating a target light source in an external environment; detecting real-time test temperature of an external environment, real-time temperature of a target light source and real-time duty ratio of the target light source in real time; according to the formula T (x') = log a And x ' + ta ' calculating a reference parameter a of the target light source, wherein x ' is the real-time duty ratio of the target light source, ta ' is the real-time test temperature of the external environment, and T (x ') is the real-time temperature of the target light source.
As an improvement of the above, the light source control method further includes: and when the real-time temperature is less than or equal to the reference temperature, generating a PWM signal with the duty ratio of 100%.
As an improvement of the above, the light source control method further includes: acquiring a switching signal; generating a light source switching signal according to the switching signal; and switching a target light source according to the light source switching signal.
Correspondingly, the invention also provides a light source control circuit, which comprises a PFC circuit, a power supply circuit, a temperature detection circuit, a signal processing circuit and a voltage reduction constant current circuit; the PFC circuit is respectively connected with the voltage-reducing constant-current circuit and the power supply circuit and is used for converting an external alternating-current power supply into a constant-voltage power supply to be output to the voltage-reducing constant-current circuit and the power supply circuit; the power supply circuit is respectively connected with the temperature detection circuit, the signal processing circuit and the voltage reduction constant current circuit and is used for carrying out voltage reduction processing on a constant voltage power supply output by the PFC circuit so as to supply power to the PFC circuit, the temperature detection circuit, the signal processing circuit and the voltage reduction constant current circuit; the temperature detection circuit is connected with the signal processing circuit and used for detecting a detection signal of an external environment and sending the detection signal to the signal processing circuit; the signal processing circuit is connected with the voltage reduction constant current circuit and used for converting the detection signal into a real-time temperature and comparing the real-time temperature with a preset reference temperature to judge whether the real-time temperature is higher than the reference temperature, wherein when the real-time temperature is higher than the reference temperature, the self-adaptive duty ratio of a target light source is calculated according to a preset reference parameter, the real-time temperature and the reference temperature, a PWM signal with the duty ratio of the self-adaptive duty ratio is generated, when the real-time temperature is lower than or equal to the reference temperature, a PWM signal with the duty ratio of 100% is generated, and the PWM signal is output to the voltage reduction constant current circuit; the voltage reduction constant current circuit is connected with a target light source and used for converting a constant voltage power supply output by the PFC circuit into a constant current power supply matched with the target light source according to the PWM signal so as to supply power to the target light source.
As an improvement of the above scheme, the signal processing circuit comprises a main control chip, and the main control chip is provided with a detection pin and a dimming pin; the main control chip is connected with the temperature detection circuit through the detection pin to acquire the detection signal; the main control chip converts the detection signal into a real-time temperature and compares the real-time temperature with a preset reference temperature to judge whether the real-time temperature is greater than the reference temperature, and when the real-time temperature is greater than the reference temperature, the real-time temperature is greater than the reference temperature according to a formula x = a (-△ta) Calculating the self-adaptive duty ratio x of the target light source, generating a PWM signal with the duty ratio being the self-adaptive duty ratio, and generating the PWM signal with the duty ratio being 100% when the real-time temperature is less than or equal to the reference temperature, wherein delta ta is the difference value between the real-time temperature and the reference temperature, and a is a reference parameter of the target light source; the main control chip is connected with the voltage reduction constant current circuit through the dimming pin so as to output the PWM signal to the voltage reduction constant current circuit.
As an improvement of the above scheme, the light source control circuit further comprises a light source selection circuit respectively connected with the power supply circuit and the signal processing circuit; the signal processing circuit is further used for acquiring a switching signal, generating a light source switching signal according to the switching signal and sending the light source switching signal to the light source selection circuit; the light source selection circuit is used for switching a target light source according to the light source switching signal.
As an improvement of the above scheme, the signal processing circuit further includes a decoupling capacitor, the main control chip is further provided with a first power pin, a ground pin and a switching pin, the first power pin is connected to the output end of the power supply circuit and one end of the decoupling capacitor, the ground pin is grounded and connected to the other end of the decoupling capacitor, and the switching pin is connected to the light source selection circuit.
As an improvement of the above scheme, the light source selection circuit includes a switching chip, a third switching tube, a fourth switching tube, a power supply resistor, a first power supply capacitor, a first filter resistor, a first filter capacitor, and a protection resistor, where the switching chip is provided with a first control pin, a second control pin, a power supply pin, an analog pin, a reference pin, and a second power supply pin; the grid electrode of the third switching tube is connected with the first control pin, the drain electrode of the third switching tube is connected with the negative electrodes of a group of target light sources, the source electrode of the third switching tube is grounded, or the grid electrode of the third switching tube is connected with the first control pin, the drain electrode of the third switching tube is connected with the output end of the PFC circuit, and the source electrode of the third switching tube is connected with the positive electrodes of a group of target light sources; the grid electrode of the fourth switching tube is connected with the second control pin, the drain electrode of the fourth switching tube is connected with the cathode of another group of target light sources, the source electrode of the fourth switching tube is grounded, or the grid electrode of the fourth switching tube is connected with the second control pin, the drain electrode of the fourth switching tube is connected with the output end of the PFC circuit, and the source electrode of the fourth switching tube is connected with the anode of another group of target light sources; the power supply pin is connected with the output end of the PFC circuit through the power supply resistor and is grounded through the first power supply capacitor; the analog pin is connected with the signal processing circuit through the protection resistor, and the reference pin is grounded; the second power supply pin is connected with the output end of the power supply circuit through the first filter resistor and is grounded through the first filter capacitor.
As an improvement of the above scheme, the voltage-reducing constant-current circuit includes a constant-current chip, a fifth switching tube, an inductor, a diode group, an RC circuit, a second filter capacitor, a second power supply capacitor, a third power supply capacitor, a frequency modulation resistor, a first resistor, a second resistor, and a sampling resistor group, and the constant-current chip is provided with an analog input pin, a third power supply pin, a frequency modulation pin, a trigger pin, a sampling pin, and a power supply input pin; the analog input pin is connected with the signal processing circuit and is grounded through the second power supply capacitor, the third power supply pin is grounded through the third power supply capacitor, the frequency modulation pin is grounded through the frequency modulation resistor, the sampling pin is connected with the grid electrode of the fifth switching tube through the second resistor and is grounded through the sampling resistor group, and the power supply input pin is connected with the power supply circuit and is grounded through the second filter capacitor; the trigger pin is connected with the grid electrode of the fifth switch tube through the first resistor, the source electrode of the fifth switch tube is grounded through the sampling resistor group, the drain electrode of the fifth switch tube is connected with the anode of the diode group and is connected with the cathode of the RC circuit through the inductor and is grounded, and the cathode of the diode group and the anode of the RC circuit are connected with the output end of the PFC circuit.
Correspondingly, the invention also provides a deep sea lighting device which comprises the light source control circuit, the target light source and the device body, wherein the light source control circuit and the target light source are packaged in the device body.
Accordingly, the present invention also provides a computer readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the steps of the above-described light source control method.
The implementation of the invention has the following beneficial effects:
the invention constructs a novel self-adaptive thermal protection method, so that the light source can carry out self-adaptive adjustment on the PWM signal according to the temperature of the external environment at a higher reference temperature, and the light source can be ensured to work at the maximum allowable brightness in the current high-temperature environment, thereby ensuring that the temperature of the light source is in a safe range, and improving the reliability and the service life of the light source.
Furthermore, the invention can simultaneously set the laser light source and the LED light source as two groups of target light sources, and switch different light sources according to different application requirements, so that one lamp can simultaneously meet the irradiation requirements of small-range long-distance high brightness and large-range short-distance high brightness, the underwater operation difficulty is greatly reduced, and the working efficiency is improved.
Drawings
FIG. 1 is a flow chart of a first embodiment of a light source control method of the present invention;
FIG. 2 is a flow chart of a light source control method according to a second embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a light source control circuit according to a first embodiment of the present invention;
fig. 4 is a circuit diagram of a PFC circuit in the present invention;
FIG. 5 is a circuit diagram of the power supply circuit of the present invention;
FIG. 6 is a circuit diagram of a temperature detection circuit in the present invention;
FIG. 7 is a circuit diagram of a signal processing circuit in the present invention;
FIG. 8 is a circuit diagram of the step-down constant current circuit of the present invention;
FIG. 9 is a schematic structural diagram of a light source control circuit according to a second embodiment of the present invention;
FIG. 10 is another circuit diagram of the light source selection circuit and the step-down constant current circuit of the present invention;
FIG. 11 is a circuit diagram of a light source selection circuit and a voltage-reducing constant-current circuit according to the present invention;
FIG. 12 is a further circuit diagram of the light source selection circuit and the step-down constant current circuit of the present invention;
FIG. 13 is a schematic structural view of the deep sea lighting device of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 shows a flowchart of a first embodiment of the light source control method of the present invention, which includes:
s101, acquiring the real-time temperature of the external environment;
when the temperature sensor works, the real-time temperature of the external environment at the position of the light source can be detected.
S102, comparing the real-time temperature with a preset reference temperature, and judging whether the real-time temperature is greater than the reference temperature;
it should be noted that the reference temperature may be preset in advance according to an external environment; correspondingly, the step of calculating the reference parameter comprises the following steps:
(1) Operating a target light source in an external environment;
(2) Detecting real-time test temperature of an external environment, real-time temperature of a target light source and real-time duty ratio of the target light source in real time;
(3) According to the formula T (x') = log a And x ' + ta ' calculating a reference parameter a of the target light source, wherein x ' is the real-time duty ratio of the target light source, ta ' is the real-time test temperature of the external environment, and T (x ') is the real-time temperature of the target light source.
S103, when the real-time temperature is higher than the reference temperature, calculating the self-adaptive duty ratio of the target light source according to the preset reference parameter, the real-time temperature and the reference temperature, and generating a PWM signal with the duty ratio being the self-adaptive duty ratio;
the step of calculating the self-adaptive duty ratio of the target light source according to the preset reference parameter, the real-time temperature and the reference temperature comprises the following steps: according to the formula x = a (-△ta) And calculating the self-adaptive duty ratio x of the target light source, wherein delta ta is the difference value between the real-time temperature and the reference temperature, and a is the reference parameter of the target light source.
Therefore, the brightness of the lamp meeting the temperature requirement in the current using environment can be calculated by detecting the real-time temperature of the current external environment, comparing the real-time temperature with the original tested reference temperature and calculating the difference value delta ta between the real-time temperature and the reference temperature as a variable, so that the maximum brightness output under different environment temperatures is realized.
S104, when the real-time temperature is less than or equal to the reference temperature, generating a PWM signal with the duty ratio of 100%;
and S105, controlling the power supply of the target light source according to the PWM signal.
Therefore, when the real-time temperature is less than or equal to the preset reference temperature, the PWM signal with the duty ratio of 100% is output to control the target light source, and the maximum brightness of the target light source is controlled under the condition that the ambient temperature is relatively low; when the real-time temperature is higher than the reference temperature, the PWM signal with the frequency of 1kHz and the duty ratio of the self-adaptive duty ratio is output, so that the lamp can work in a safe temperature range, and the maximum brightness output can be realized in an allowable range.
In conclusion, by constructing a novel self-adaptive thermal protection method, the light source can perform self-adaptive adjustment on the PWM signal according to the temperature of the external environment at a higher reference temperature, so that the light source can work at the maximum allowable brightness in the current high-temperature environment, the temperature of the light source is ensured to be within a safe range, and the reliability and the service life of the light source are improved.
Referring to fig. 2, fig. 2 shows a flowchart of a second embodiment of the light source control method of the present invention,
s201, acquiring the real-time temperature of the external environment;
s202, comparing the real-time temperature with a preset reference temperature, judging whether the real-time temperature is greater than the reference temperature,
s203, when the real-time temperature is higher than the reference temperature, calculating the self-adaptive duty ratio of the target light source according to the preset reference parameter, the real-time temperature and the reference temperature, and generating a PWM signal with the duty ratio as the self-adaptive duty ratio,
s204, when the real-time temperature is less than or equal to the reference temperature, generating a PWM signal with the duty ratio of 100%;
and S205, controlling the power supply of the target light source according to the PWM signal.
S206, acquiring a switching signal;
s207, generating a light source switching signal according to the switching signal;
and S208, switching the target light source according to the light source switching signal.
Unlike the first embodiment shown in fig. 1, the present embodiment can selectively switch the corresponding light source path to illuminate the target light source, thereby implementing the selection of different light sources. Preferably, the light source switching signal may be a high level signal and a low level signal.
Therefore, the invention can be applied to the laser deep sea lamp, and simultaneously sets the laser light source and the LED light source as two groups of target light sources, and switches different light sources according to different application requirements, so that one deep sea searchlight can simultaneously meet the irradiation requirements of 'small-range long-distance high brightness' and 'large-range short-distance high brightness', the underwater operation difficulty is greatly reduced, and the working efficiency is improved.
Referring to fig. 3, fig. 3 shows a first embodiment of the light source control circuit of the present invention, which includes a PFC circuit 1, a power supply circuit 2, a temperature detection circuit 3, a signal processing circuit 4, and a step-down constant current circuit 5, specifically:
the PFC circuit 1 is connected with the voltage-reducing constant-current circuit 5 and the power supply circuit 2 respectively and is used for converting an external alternating-current power supply into a constant-voltage power supply to output the constant-voltage power supply to the voltage-reducing constant-current circuit 5 and the power supply circuit 2;
the power supply circuit 2 is respectively connected with the temperature detection circuit 3, the signal processing circuit 4 and the voltage reduction constant current circuit 5, and is used for performing voltage reduction processing on a constant voltage power supply output by the PFC circuit 1 so as to convert the constant voltage power supply into fixed output voltage, and then supplying power to the PFC circuit 1, the temperature detection circuit 3, the signal processing circuit 4 and the voltage reduction constant current circuit 5, so that the influence of input fluctuation on output parameters is reduced;
the temperature detection circuit 3 is connected with the signal processing circuit 4 and is used for detecting a detection signal corresponding to the real-time temperature of the external environment at the position where the light source is located and sending the detection signal to the signal processing circuit 4; preferably, the detection signal may be an electrical signal such as a voltage signal, a current signal, etc., but is not limited thereto as long as temperature information can be accurately reflected;
the signal processing circuit 4 is connected with the voltage-reducing constant-current circuit 5 and is used for converting the detection signal into a real-time temperature and comparing the real-time temperature with a preset reference temperature so as to judge whether the real-time temperature is greater than the reference temperature, wherein when the real-time temperature is greater than the reference temperature, the self-adaptive duty ratio of the target light source is calculated according to a preset reference parameter, the real-time temperature and the reference temperature, a PWM signal with the duty ratio of the self-adaptive duty ratio is generated, when the real-time temperature is less than or equal to the reference temperature, the PWM signal with the duty ratio of 100% is generated, and the PWM signal is output to the voltage-reducing constant-current circuit 5;
the voltage reduction constant current circuit 5 is connected with the target light source and used for converting the constant voltage power supply output by the PFC circuit 1 into a constant current power supply matched with the target light source according to the PWM signal so as to supply power to the target light source.
Therefore, after an external alternating current power supply input from the outside is powered on, the temperature detection circuit 3 feeds back a detection signal of an external environment to the signal processing circuit 4, the signal processing circuit 4 processes the real-time temperature converted according to the detection signal, and when the real-time temperature exceeds a reference temperature, different PWM signals are output to the voltage reduction constant current circuit 5 according to different real-time temperatures, so that a corresponding target light source is lightened, and the laser deep sea lamp is ensured to work in a safe temperature range.
In conclusion, the novel self-adaptive thermal protection method is constructed, so that the target light source can perform self-adaptive adjustment on the PWM signal according to the temperature of the external environment at a higher reference temperature, the laser deep sea lamp is ensured to work at the maximum allowable brightness in the current high-temperature environment, the temperature of the adjusted lamp is ensured to be in a safe range, and the reliability and the service life of the lamp are improved.
The invention is described in further detail below with reference to specific circuit diagrams:
1. PFC circuit 1
As shown in fig. 4, the PFC circuit 1 includes a rectifier bridge BD1, a transformer T1, a constant voltage control chip U1, and peripheral circuits. An external alternating current power supply is converted into direct current after being arranged through a rectifier bridge BD1, then the direct current is subjected to voltage reduction through a transformer T1, and the direct current is converted into constant voltage power supply HV output through a constant voltage control chip U1, so that the influence of input fluctuation on a rear-stage circuit is reduced, and the stability of the circuit is improved.
Preferably, the model of the constant voltage control chip U1 is BP2628, but is not limited thereto. The specific circuit structure and circuit connection relationship of the rectifier bridge BD1, the transformer T1, the constant voltage control chip U1 and the peripheral circuits thereof are shown in fig. 4, and are not described herein again.
2. Power supply circuit 2
As shown in fig. 5, the power supply circuit 2 includes a constant voltage driving chip U2, a voltage dropping chip U6, a first inductor L1, a fifth diode D5, a sixth diode D6, a second capacitor EC2, a third capacitor C3, a fifth capacitor EC5, an eleventh resistor R11, and a twelfth resistor R12; the driving pin DRAIN of the constant-voltage driving chip U2 is connected to the output terminal HV of the PFC circuit 1, the power supply pin VCC and the voltage selection pin SEL are both connected to the cathode of the fifth diode D5, the ground pin GND is grounded through the sixth diode D6 and connected to the cathode of the fifth diode D5 through the third capacitor C3, the sampling pin CS is connected to one end of the eleventh resistor R11, the other end of the eleventh resistor R11 is connected to the anode of the fifth diode D5 and the input terminal Vin of the buck chip U6 through the first inductor L1, the anode of the fifth diode D5 is further grounded through the fifth capacitor EC5 and the twelfth resistor R12, the output terminal Vout of the buck chip U6 is grounded through the second capacitor EC2, and the ground terminal GND of the buck chip U6 is grounded.
After entering the constant voltage driving chip U2 for voltage reduction processing, the constant voltage power supply HV output by the PFC circuit 1 can generate a 12V power supply to supply power to the constant voltage control chip U1 of the PFC circuit 1 and the voltage reduction constant current circuit 5, and at the same time, the 12V power supply also performs secondary voltage reduction through the voltage reduction chip U6 to generate a 5V power supply to supply power to the temperature detection circuit 3 and the signal processing circuit 4. Further, the constant voltage driver U2 is a step-down type constant voltage driver, wherein the model of the constant voltage driver U2 is preferably BP2522B, and the model of the step-down chip U6 is preferably 78L 05.
3. Temperature detection circuit 3
As shown in fig. 6, the temperature detection circuit 3 includes a thermistor RL and a pull-down resistor R60, wherein one end of the thermistor RL is connected to the output end of the power supply circuit 2, and the other end is connected to the signal processing circuit 4 and grounded through the pull-down resistor R60.
It should be noted that the resistance value of the thermistor RL is in inverse proportion to the temperature, and when the temperature changes, the voltage signal between the thermistor RL and the pull-down resistor R60 is detected; then, the voltage signal is transmitted to the signal processing circuit 4, so that the real-time temperature of the external environment where the target light source is located can be calculated.
4. Signal processing circuit 4
As shown in fig. 7, the signal processing circuit 4 includes a main control chip U7, and the main control chip U7 is provided with a detection pin ADI and a dimming pin P0.0;
the main control chip U7 is connected with the temperature detection circuit 3 through a detection pin ADI to obtain a voltage signal;
the main control chip U7 converts the voltage signal into a real-time temperature and compares the real-time temperature with a preset reference temperature to judge whether the real-time temperature is greater than the reference temperature, and when the real-time temperature is greater than the reference temperature, the real-time temperature is larger than the reference temperature according to a formula x = a (-△ta) Calculating the self-adaptive duty ratio x of the target light source, generating a PWM signal with the duty ratio being the self-adaptive duty ratio, and generating the PWM signal with the duty ratio being 100% when the real-time temperature is less than or equal to the reference temperature, wherein delta ta is the difference value between the real-time temperature and the reference temperature, and a is the reference parameter of the target light source;
the main control chip U7 is connected to the step-down constant current circuit 5 through the dimming pin P0.0 to output a PWM signal to the step-down constant current circuit 5. Preferably, the model of the main control chip U7 is PL51T020, but not limited thereto.
Therefore, when the real-time temperature is less than or equal to the preset reference temperature, the dimming pin P0.0 of the main control chip U7 outputs a PWM signal with a duty ratio of 100% to the voltage-reducing constant-current circuit 5; when the real-time temperature is higher than the reference temperature, the dimming pin P0.0 of the main control chip U7 outputs a PWM signal with the frequency of 1kHz and the duty ratio of the self-adaptive duty ratio, so that the lamp can work in a safe temperature range.
It should be noted that the adaptive duty ratio is calculated by the following relation:
assuming that the real-time temperature is 40 ℃ (ta = 40), the maximum brightness is the protection critical point (T (x) = 40), and T (x) = log a x + ta, where x is the adaptive duty cycle, and when the adaptive duty cycle x =100%, T (100%) = ta =40; when the real-time temperature exceeds 40 ℃ (i.e. ta =40 +. DELTA.ta), then T (x) = log a x +40 +. DELTA.ta, in which case T (x) = log is calculated a x +40 +. DELTA =40 corresponding adaptive duty cycle x = a (-△ta) FromAnd the maximum output power at this real-time temperature can be derived.
Accordingly, the reference parameter a may be pre-calculated by: (1) operating a target light source in an external environment; (2) Detecting real-time test temperature ta 'of an external environment, real-time temperature of a target light source and real-time duty ratio x' of the target light source in real time; (3) According to the formula T (x') = log a And x ' + ta ' calculating a reference parameter a of the target light source, wherein x ' is the real-time duty ratio of the target light source, ta ' is the real-time test temperature of the external environment, and T (x ') is the real-time temperature of the target light source.
Therefore, the brightness of the lamp meeting the temperature requirement in the current use environment can be calculated by detecting the real-time temperature of the current external environment, comparing the real-time temperature with the original tested reference temperature and calculating the difference value delta ta between the real-time temperature and the reference temperature as a variable, so that the maximum brightness output under different reference temperatures is realized.
5. Step-down constant current circuit 5
As shown in fig. 8, the voltage-reducing constant current circuit 5 includes a constant current chip U3, a fifth switch Q5, an inductor T2, a diode group (D7 and D8), an RC circuit (EC 3 and R13), a second filter capacitor C9, a second power supply capacitor C8, a third power supply capacitor C25, a frequency modulation resistor R18, a first resistor R15, a second resistor R16, and a sampling resistor group (RS 5, RS6, RS7, RS8, and RS 9), the constant current chip U3 is provided with an analog input pin PWM, a third power supply pin VDD, a frequency modulation pin RT, a trigger pin GATE, a sampling pin CS, and a power supply input pin VIN;
the analog input pin PWM is connected with the signal processing circuit 4 and is grounded through a second power supply capacitor C8, a third power supply pin VDD is grounded through a third power supply capacitor C25, a frequency modulation pin RT is grounded through a frequency modulation resistor R18, a sampling pin CS is connected with the grid of a fifth switching tube Q5 through a second resistor R16 and is grounded through a sampling resistor group (RS 5, RS6, RS7, RS8 and RS 9), and a power supply input pin VIN is connected with the power supply circuit 2 and is grounded through a second filter capacitor C9;
the trigger pin GATE is connected with a grid electrode of a fifth switch tube Q5 through a first resistor R15, a source electrode of the fifth switch tube Q5 is grounded through a sampling resistor group (RS 5, RS6, RS7, RS8 and RS 9), a drain electrode of the fifth switch tube Q5 is connected with positive electrodes of diode groups (D7 and D8) and connected with negative electrodes of RC circuits (EC 3 and R13) through an inductor T2 and grounded, and negative electrodes of the diode groups (D7 and D8) and positive electrodes of the RC circuits (EC 3 and R13) are connected with an output end of the PFC circuit 1. Correspondingly, the constant current chip U3 is a step-down constant current main control chip, preferably, but not limited to, the model number of AP 5199.
It should be noted that the second power supply capacitor C8 in the step-down constant current circuit 5 is used for decoupling the input PWM signal; the third power supply capacitor C25 is used for storing energy at a power supply end; the frequency modulation resistor R18 is used for adjusting the working frequency of the circuit; the second filter capacitor C9 is used for filtering and storing energy at the input end; the sampling resistor groups (RS 5, RS6, RS7, RS8 and RS 9) are used for collecting working current and feeding the working current back to the U3 for control; the fifth switching tube Q5, the diode groups (D7 and D8) and the inductor T2 form a voltage reduction constant current circuit 5; the electrolytic capacitor EC3 in the RC circuit (EC 3 and R13) is used for output filtering, and the resistor R13 is used for consuming EC3 electric quantity in the no-load state.
When the constant current chip U3 works, the fifth switching tube Q5 can be opened and closed according to logic, a constant voltage power supply output by the PFC circuit 1 is converted into a constant current power supply required by a target light source, and the constant current function is realized.
As can be seen from fig. 4 to 8, the step-down constant current circuit 5 mainly performs energy conversion by controlling the on and off states of the fifth switching tube Q5;
when the fifth switch tube Q5 is opened, the current flows through the following loop: an output end HV- > a target light source- > an inductor T2- > a fifth switching tube Q5- > a sampling resistor group (RS 5, RS6, RS7, RS8 and RS 9) - > GND of the PFC circuit 1, and the inductor T2 stores energy at the stage; at this time, the current of the target light source rises, the constant current chip U3 can judge the magnitude of the current by identifying the voltage signal of the sampling resistor group (RS 5, RS6, RS7, RS8 and RS 9), and when the voltage signal reaches the OCP point (i.e., the overcurrent point) of the constant current chip U3, the fifth switching tube Q5 is turned off, thereby realizing the constant current function.
When the fifth switch Q5 is turned off, the current flows from the inductor T2, and returns to the inductor T2 through the target light source, and the inductor T2 is in a discharge state.
It should be noted that when the dimming pin DIM of the signal processing unit outputs PWM signals with different duty ratios, the PWM signals can control the magnitude of the OCP voltage of the constant current chip U3; namely, the duty ratio is small, the OCP voltage is small, and the output current is reduced; the duty ratio is large, the OCP voltage is large, and the output current is large. Therefore, the output current is different for different light sources, and the output current is controlled by the change of the duty ratio of the DIM signal.
Referring to fig. 9, fig. 9 shows a second embodiment of the light source control circuit of the present invention, which is different from the first embodiment shown in fig. 3, in this embodiment, the light source control circuit further includes a light source selection circuit 7 respectively connected to the power supply circuit 2, the signal processing circuit 4 and the target light source 002, one of the two sets of target light sources is a laser light source, and the other set of target light sources is an LED light source, specifically: the signal processing circuit 4 is further configured to obtain a switching signal, generate a light source switching signal according to the switching signal, and send the light source switching signal to the light source selection circuit 7; the light source selection circuit 7 is configured to switch the target light source 002 according to the light source switching signal.
Therefore, the light source selection circuit 7 can selectively turn on the corresponding light source path by the light source switching signal to light the target light source, thereby realizing the selection of different light sources.
As shown in fig. 7, the signal processing circuit 4 further includes a decoupling capacitor C2, the main control chip U7 is further provided with a first power pin VDD, a ground pin VSS and a switching pin AD0, the first power pin VDD is connected to the output terminal of the power supply circuit 2 and one end of the decoupling capacitor C2, the ground pin VSS is grounded and connected to the other end of the decoupling capacitor C2, and the switching pin AD0 is connected to the light source selection circuit; the decoupling capacitor C2 is used to filter the high-frequency interference of the power supply circuit 2.
It should be noted that the present invention realizes the switching of different target light sources through the ASC switch. Specifically, after the ACS switch is turned on, the decoupling capacitor C2 in the signal processing circuit 4 is powered by 5V; after the ACS switch is closed, C2 is not powered; therefore, the main control chip U7 can perform switching identification through the ACS switch.
Accordingly, the main control chip U7 can output the light source switching signal of two states (high level/low level) to the light source selection circuit 7 through the switching pin AD0 to realize the switching of the target light source.
As shown in fig. 10, in this embodiment, the light source selection circuit 7 includes a switching chip U5, a third switching tube Q3, a fourth switching tube Q4, a power supply resistor R56, a first power supply capacitor C23, a first filter resistor R30, a first filter capacitor C24, and a protection resistor R57, and the switching chip U5 is provided with a first control pin D1, a second control pin D2, a power supply pin VH, an analog pin PWM, a reference pin VS, and a second power supply pin VCC; the source electrode of the third switching tube Q3 is grounded, the drain electrode is connected with a group of target light sources, and the grid electrode is connected with a first control pin D1; the source electrode of the fourth switching tube Q4 is grounded, the drain electrode of the fourth switching tube Q4 is connected with the other group of target light sources, and the grid electrode of the fourth switching tube Q4 is connected with the second control pin D2; the power supply pin VH is connected with the output end of the PFC circuit 1 through a power supply resistor R56 and is grounded through a first power supply capacitor C23; the analog pin PWM connection is connected with the signal processing circuit 4 through a protective resistor R57, and the reference pin VS is grounded; the second power supply pin VCC is connected to the output terminal of the power supply circuit 2 through a first filter resistor R30, and is grounded through a first filter capacitor C24.
It should be noted that the power supply resistor R56 and the first power supply capacitor C23 are used for supplying power to the fourth switching tube Q4 and the third switching tube Q3; the fourth switching tube Q4 and the third switching tube Q3 are used for conducting loops of different target light sources to select the light sources; the first filter resistor R30 and the first filter capacitor C24 are used for switching a control end of the chip U5 to supply power, filter and store energy; the protection resistor R57 is used for protecting the analog pin PWM of the switching chip U5, and preventing the switching chip U5 from being damaged by an excessively high voltage. Preferably, the model of the switching chip U5 is BP5929, but not limited thereto.
When the switching circuit works, the analog pin PWM of the switching chip U5 receives a light source switching signal of the signal processing unit, and when the light source switching signal is at a high level, the fourth switching tube Q4 is switched on and the third switching tube Q3 is switched off; when the light source switching signal is at a low level, the fourth switching tube Q4 is turned off and the third switching tube Q3 is turned on, so as to select different target light sources.
Therefore, the invention can simultaneously set the laser light source and the LED light source as two groups of target light sources, and switch different light sources according to different application requirements, so that one lamp can simultaneously meet the irradiation requirements of 'small-range long-distance high brightness' and 'large-range short-distance high brightness', thereby greatly reducing the underwater operation difficulty and improving the working efficiency.
As shown in fig. 11, unlike the first embodiment shown in fig. 10, in this embodiment, the gate of the third switching tube Q3 of the light source selection circuit 7 is connected to the first control pin D1, the drain of the third switching tube Q3 is connected to the output terminal HV of the PFC circuit, the source of the third switching tube Q3 is connected to the positive electrode of another set of target light sources, and the negative electrode of the set of target light sources is grounded;
that is, the third switch tube Q3 can be further disposed between the output terminal HV of the PFC circuit and the positive electrode of the target light source to realize the switching control of the target light source.
As shown in fig. 12, unlike the first embodiment shown in fig. 10, in this embodiment, the gate of the fourth switching transistor Q4 of the light source selection circuit 7 is connected to the second control pin D2, the drain of the fourth switching transistor Q4 is connected to the output terminal HV of the PFC circuit, the source of the fourth switching transistor Q4 is connected to the anodes of a group of target light sources, and the cathodes of the group of target light sources are grounded;
similarly, the fourth switch tube Q4 may also be disposed between the output end HV of the PFC circuit and the anode of the other group of target light sources, so as to implement switching control of the target light sources.
In addition, it should be noted that the types of the third switching tube Q3 and the fourth switching tube Q4 in the above embodiments may be set according to practical use situations, for example, MOS tubes or triodes are used, and the invention is not limited to this.
As shown in fig. 13, the present invention further discloses a deep sea lighting device, which comprises the light source control circuit 001, the target light source 002 and the device body 003, wherein the light source control circuit 001 and the target light source 002 are packaged in the device body 003.
Therefore, the power supply of the target light source 002 is controlled by the light source control circuit 001, so that the PWM signal can be adaptively adjusted according to the temperature of the external environment, and the light source can be ensured to work at the maximum allowable brightness in the current high-temperature environment, so that the temperature of the light source is ensured to be within the safe range, and the reliability and the service life of the light source are improved; meanwhile, the target light source 002 is switched and controlled through the light source control circuit 001, so that the deep sea lighting device can meet the irradiation requirements of small-range long-distance high brightness and large-range short-distance high brightness, the underwater operation difficulty is greatly reduced, and the working efficiency is improved.
Accordingly, the present invention also discloses a computer readable storage medium having a computer program stored thereon, wherein the computer program is executed by a processor to perform the steps of the above-mentioned light source control method.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (13)

1. A light source control method, comprising:
acquiring the real-time temperature of the external environment;
comparing the real-time temperature with a preset reference temperature;
when the real-time temperature is higher than the reference temperature, calculating the self-adaptive duty ratio of the target light source according to a preset reference parameter, the real-time temperature and the reference temperature, and generating a PWM signal with the duty ratio being the self-adaptive duty ratio;
and controlling the power supply of the target light source according to the PWM signal.
2. The method for controlling a light source according to claim 1, wherein the step of calculating the adaptive duty ratio of the target light source according to the preset reference parameter, the real-time temperature and the reference temperature comprises: according to the formula x = a (-△ta) And calculating the self-adaptive duty ratio x of the target light source, wherein delta ta is the difference value between the real-time temperature and the reference temperature, and a is the reference parameter of the target light source.
3. The light source control method according to claim 2, wherein the calculating of the reference parameter includes:
operating a target light source in an external environment;
detecting real-time test temperature of an external environment, real-time temperature of a target light source and real-time duty ratio of the target light source in real time;
according to the formula T (x') = log a And x ' + ta ' calculating a reference parameter a of the target light source, wherein x ' is the real-time duty ratio of the target light source, ta ' is the real-time test temperature of the external environment, and T (x ') is the real-time temperature of the target light source.
4. The light source control method according to claim 1, further comprising: and when the real-time temperature is less than or equal to the reference temperature, generating a PWM signal with the duty ratio of 100%.
5. The light source control method according to claim 1, further comprising:
acquiring a switching signal;
generating a light source switching signal according to the switching signal;
and switching the target light source according to the light source switching signal.
6. A light source control circuit is characterized by comprising a PFC circuit, a power supply circuit, a temperature detection circuit, a signal processing circuit and a voltage reduction constant current circuit;
the PFC circuit is respectively connected with the voltage-reducing constant-current circuit and the power supply circuit and is used for converting an external alternating-current power supply into a constant-voltage power supply to output the constant-voltage power supply to the voltage-reducing constant-current circuit and the power supply circuit;
the power supply circuit is respectively connected with the temperature detection circuit, the signal processing circuit and the voltage reduction constant current circuit and is used for carrying out voltage reduction processing on a constant voltage power supply output by the PFC circuit so as to supply power to the PFC circuit, the temperature detection circuit, the signal processing circuit and the voltage reduction constant current circuit;
the temperature detection circuit is connected with the signal processing circuit and used for detecting a detection signal of an external environment and sending the detection signal to the signal processing circuit;
the signal processing circuit is connected with the voltage reduction constant current circuit and used for converting the detection signal into a real-time temperature and comparing the real-time temperature with a preset reference temperature to judge whether the real-time temperature is higher than the reference temperature, wherein when the real-time temperature is higher than the reference temperature, the self-adaptive duty ratio of a target light source is calculated according to a preset reference parameter, the real-time temperature and the reference temperature, a PWM signal with the duty ratio of the self-adaptive duty ratio is generated, when the real-time temperature is lower than or equal to the reference temperature, a PWM signal with the duty ratio of 100% is generated, and the PWM signal is output to the voltage reduction constant current circuit;
the voltage reduction constant current circuit is connected with a target light source and used for converting a constant voltage power supply output by the PFC circuit into a constant current power supply matched with the target light source according to the PWM signal so as to supply power to the target light source.
7. The light source control circuit according to claim 6, wherein the signal processing circuit comprises a main control chip, and the main control chip is provided with a detection pin and a dimming pin;
the main control chip is connected with the temperature detection circuit through the detection pin to acquire the detection signal;
the main control chip converts the detection signal into a real-time temperature and compares the real-time temperature with a preset reference temperature to judge whether the real-time temperature is greater than the reference temperature, and when the real-time temperature is greater than the reference temperature, the real-time temperature is greater than the reference temperature according to a formula x = a (-△ta) Calculating the self-adaptive duty ratio x of the target light source, generating a PWM signal with the duty ratio being the self-adaptive duty ratio, and generating the PWM signal with the duty ratio being 100% when the real-time temperature is less than or equal to the reference temperature, wherein delta ta is the difference value between the real-time temperature and the reference temperature, and a is a reference parameter of the target light source;
the main control chip is connected with the voltage reduction constant current circuit through the dimming pin so as to output the PWM signal to the voltage reduction constant current circuit.
8. The light source control circuit according to claim 7, further comprising a light source selection circuit connected to the power supply circuit and the signal processing circuit, respectively;
the signal processing circuit is further used for acquiring a switching signal, generating a light source switching signal according to the switching signal and sending the light source switching signal to the light source selection circuit;
the light source selection circuit is used for switching the target light source according to the light source switching signal.
9. The light source control circuit according to claim 8, wherein the signal processing circuit further comprises a decoupling capacitor, the main control chip further comprises a first power pin, a ground pin and a switching pin, the first power pin is connected to the output terminal of the power supply circuit and one end of the decoupling capacitor, the ground pin is grounded and connected to the other end of the decoupling capacitor, and the switching pin is connected to the light source selection circuit.
10. The light source control circuit according to claim 8, wherein the light source selection circuit comprises a switching chip, a third switching tube, a fourth switching tube, a power supply resistor, a first power supply capacitor, a first filter resistor, a first filter capacitor and a protection resistor, and the switching chip is provided with a first control pin, a second control pin, a power supply pin, an analog pin, a reference pin and a second power supply pin;
the grid electrode of the third switching tube is connected with the first control pin, the drain electrode of the third switching tube is connected with the cathodes of a group of target light sources, and the source electrode of the third switching tube is grounded; or the grid electrode of the third switching tube is connected with the first control pin, the drain electrode of the third switching tube is connected with the output end of the PFC circuit, and the source electrode of the third switching tube is connected with the anodes of a group of target light sources;
the grid electrode of the fourth switching tube is connected with the second control pin, the drain electrode of the fourth switching tube is connected with the cathode of the other group of target light sources, and the source electrode of the fourth switching tube is grounded; or the grid electrode of the fourth switching tube is connected with the second control pin, the drain electrode of the fourth switching tube is connected with the output end of the PFC circuit, and the source electrode of the fourth switching tube is connected with the anode of the other group of target light sources;
the power supply pin is connected with the output end of the PFC circuit through the power supply resistor and is grounded through the first power supply capacitor;
the analog pin is connected with the signal processing circuit through the protection resistor, and the reference pin is grounded;
the second power supply pin is connected with the output end of the power supply circuit through the first filter resistor and is grounded through the first filter capacitor.
11. The light source control circuit according to claim 6, wherein the step-down constant current circuit comprises a constant current chip, a fifth switch tube, an inductor, a diode group, an RC circuit, a second filter capacitor, a second supply capacitor, a third supply capacitor, a frequency modulation resistor, a first resistor, a second resistor and a sampling resistor group, and the constant current chip is provided with an analog input pin, a third power supply pin, a frequency modulation pin, a trigger pin, a sampling pin and a power supply input pin;
the analog input pin is connected with the signal processing circuit and is grounded through the second power supply capacitor, the third power supply pin is grounded through the third power supply capacitor, the frequency modulation pin is grounded through the frequency modulation resistor, the sampling pin is connected with the grid electrode of the fifth switching tube through the second resistor and is grounded through the sampling resistor group, and the power supply input pin is connected with the power supply circuit and is grounded through the second filter capacitor;
the trigger pin is connected with the grid electrode of the fifth switch tube through the first resistor, the source electrode of the fifth switch tube is grounded through the sampling resistor group, the drain electrode of the fifth switch tube is connected with the anode of the diode group and is connected with the cathode of the RC circuit through the inductor and is grounded, and the cathode of the diode group and the anode of the RC circuit are connected with the output end of the PFC circuit.
12. A deep sea lighting device comprising the light source control circuit, the target light source and the device body according to any one of claims 6 to 11, wherein the light source control circuit and the target light source are packaged in the device body.
13. Computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 5.
CN202211676229.8A 2022-12-26 2022-12-26 Light source control method, light source control circuit deep sea lighting device and storage medium Pending CN115942538A (en)

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WO2024139615A1 (en) * 2022-12-26 2024-07-04 佛山电器照明股份有限公司 Light source control method, deep sea illumination device having light source control circuit, and storage medium

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CN202587484U (en) * 2012-03-14 2012-12-05 深圳市兆驰节能照明有限公司 Led temperature compensation control circuit
TW201506308A (en) * 2013-08-05 2015-02-16 Cal Comp Electronics & Comm Co Over temperature protecting apparatus and over temperature protecting method thereof
CN204539556U (en) * 2014-12-17 2015-08-05 广州南科集成电子有限公司 The switch dimming drive circuit of Width funtion LED and LED dimming control system
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