WO2018000860A1 - 一种led舞台灯温度自适应控制系统及控制方法 - Google Patents

一种led舞台灯温度自适应控制系统及控制方法 Download PDF

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Publication number
WO2018000860A1
WO2018000860A1 PCT/CN2017/077201 CN2017077201W WO2018000860A1 WO 2018000860 A1 WO2018000860 A1 WO 2018000860A1 CN 2017077201 W CN2017077201 W CN 2017077201W WO 2018000860 A1 WO2018000860 A1 WO 2018000860A1
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module
temperature
control module
led
light source
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PCT/CN2017/077201
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English (en)
French (fr)
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蒋伟楷
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广州市浩洋电子股份有限公司
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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]
    • 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
    • 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
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • the invention relates to the field of stage lamp technology, and more particularly to an LED stage lamp temperature adaptive control system and a control method thereof.
  • the stage light of the LED light source has the characteristics of energy saving, long life, environmental protection, fast response and easy adjustment.
  • the theoretical energy consumption is 10% of the incandescent lamp, 50% of the fluorescent lamp, and the life is 10 times that of the fluorescent lamp.
  • the LED white light source has no ultraviolet light, infrared light and other radiation, and is packaged in a resin silica gel, which has the advantages of strong structure and recycling.
  • LED light source is favored by the stage lighting industry and has been widely used in large-scale stage, opera house, stadium and other performances.
  • Stage lighting uses high-power LED light source.
  • the forward current inside the LED will exceed the safe area, which will greatly reduce or even damage the LED life; and its peak wavelength, radiant flux,
  • the spectral properties such as color temperature are also greatly affected by temperature, which reduces the quality of luminescence; LEDs are mostly encapsulated in transparent epoxy resin. If the junction temperature exceeds the solid phase transition temperature (usually 125 ° C), the packaging material will transform into a rubbery shape and have a thermal expansion coefficient. Sudden rise, resulting in LED open circuit and failure, affecting the normal use of LED stage lights and shortening the service life of LEDs.
  • the present invention provides an LED stage lamp temperature adaptive control system and a control method thereof to overcome at least one of the above-mentioned drawbacks of the prior art.
  • the invention has the advantages of simple structure and convenient use, and the LED lamp has good temperature control effect through the cooperation of the control system and the control method.
  • an LED stage lamp temperature adaptive control system which comprises a temperature acquisition module, a temperature sensing control module, an A/D conversion module, an MCU control module, and a power supply.
  • Module, LED driving module, protection module, compensation module, fan control module and cooling fan, the temperature sensing control module, A/D conversion module, power supply module, LED driving module, protection module, compensation module and fan control module Each is electrically connected to the MCU control module, the temperature acquisition module and the A/D conversion module are electrically connected to the temperature sensing control module, and the protection module is electrically connected to the LED driving module, and the cooling fan is The fan control module is electrically connected, and the temperature acquisition module is disposed at a stage light source.
  • the temperature acquisition module starts to collect the temperature value at the stage light source, and then transmits the collected temperature value data to the A/D conversion module through the temperature sensing control module for data conversion. Then the MCU control module starts to read the converted data on the A/D conversion module, and determines according to the read temperature value, and selects a corresponding processing manner, including a cooling fan. Whether it is running, the speed of the cooling fan running, the LED light source power is kept constant, and whether the protection module is activated. It should be noted that once the protection module is activated, the entire system will stop running and the system must be manually started after waiting for the temperature to cool.
  • the main control chip of the MCU control module adopts a 32-bit MCU STM32F051, and its operating frequency is 72M, and the running speed is increased to make the temperature curve smoother and the fluctuation is small.
  • the fan control module includes a fan drive circuit, a power supply circuit, a fan rotation speed detection circuit, and a fan failure detection circuit that are electrically connected in sequence, and the fan drive circuit, the power supply circuit, the fan rotation speed detection circuit, and the fan failure detection circuit are all The main control chip of the MCU control module is controlled.
  • the temperature collecting module comprises a plurality of parallel thermistors, and the plurality of parallel thermistors are arranged between the LED light sources along the radial direction of the stage light LED light source mounting surface.
  • the MCU control module controls the plurality of thermistor rotation strobes through the temperature sensing control module, detects the temperature of different positions of the LED light source mounting surface, and sends the temperature analog data collected by the thermistor to the A/D conversion module, A
  • the /D conversion module converts the temperature value into a digital signal input MCU control module to complete an acquisition process.
  • the central position of the LED light source mounting surface that is, the higher the concentration of the LED light source, the lower the temperature, the closer to the circumferential edge, the lower the temperature.
  • the invention also provides a control method based on the above-mentioned LED stage lamp temperature adaptive control system, which comprises the following steps:
  • the power supply module supplies power to the LED stage lamp temperature adaptive control system
  • the MCU control module controls, by the temperature sensing control module, the temperature collecting module to collect data of the temperature value Tr at the stage light source for a fixed period of time;
  • the temperature acquisition module (1) transmits the data of the temperature value Tr at the collected stage light source to the MCU control module (4);
  • the MCU control module After receiving the data of the temperature value Tr, the MCU control module compares the temperature value Tr with the set temperature threshold, and adopts the following different control strategies according to the comparison result:
  • Tr ⁇ Ta the temperature at the light source is less than the minimum value, no cooling is required, the power of the LED light source is maintained at the rated value, and the protection module does not work;
  • the MCU control module sends a control signal to the fan control module, and the fan control module controls the speed of the cooling fan to be slow, the LED light source The power remains at rated value and the protection module does not work;
  • the MCU control module sends a control signal to the fan control module, and the fan control module controls the speed of the cooling fan to be high speed, and the LED light source power is Rating, the protection module does not work;
  • the MCU control module sends a control signal to the fan control module, and the fan control module controls the speed of the cooling fan to be high speed, and the MCU control module according to the temperature rise
  • the output power of the LED light source is lowered, and the LED driving module enters the temperature compensation zone, and the output peak current and the average current are reduced by the compensation module, thereby reducing the power of the LED light source; at this time, the protection module does not work;
  • the MCU control module activates the protection module and turns off the output of the LED driver module for protection purposes.
  • step S5 when Tc ⁇ Tr ⁇ Tm, after the MCU control module reduces the LED light source power, it needs to re-compare with the new temperature data until the temperature at the light source is within the safe range to adjust the system working state. , restore the LED light source to the rated power operation.
  • the temperature collecting module collects the data of the temperature value Tr at the stage light source after each fixed time interval, and collects the data three times in succession, and takes the average value of the three times as the data of the temperature value Tr. This is to maintain the efficiency of the system operation and the accuracy of the data; since the LEDs of different powers of different environments have different real-time requirements for temperature detection, the value of the interval can be adjusted for a fixed period of time.
  • the temperature collecting module first transmits the data of the temperature value Tr at the collected stage light source to the temperature sensing control module, and then the temperature sensing control module outputs the data of the temperature value Tr.
  • the data is converted to the A/D conversion module, and finally the A/D conversion module transmits the converted data to the MCU control module.
  • the MCU control module determines the driving current of the current driving end of the LED light source according to the LED power and temperature curve relationship diagram, thereby controlling the power of the LED light source; if the temperature is too high, it will The LED light source reduces the power, and at the same time, the cooling fan is turned on, and the temperature is lowered. According to Weber Fichner's law, reducing the power of the LED light source at this time reduces the brightness without causing much influence.
  • the LED stage lamp temperature adaptive control system and the control method of the invention comprehensively control the temperature of each stage in the LED lamp for different working conditions, so that the module temperature control of the stage lamp LED is more efficient, and the stage is also lowered.
  • the lamp runs noise and prolongs the life of the LED module. Through the use in multiple products, the effect is good and the cost is not increased much, which has good practical value.
  • FIG. 1 is a block diagram of a temperature adaptive control system for an LED stage lamp of the present invention.
  • FIG. 2 is a schematic block diagram of a fan control module in the present invention.
  • FIG. 3 is a flow chart of a control method of the LED stage lamp temperature adaptive control system of the present invention.
  • Figure 4 is a graph of LED power versus temperature curves.
  • an LED stage lamp temperature adaptive control system includes a temperature acquisition module 1, a temperature sensing control module 2, an A/D conversion module 3, an MCU control module 4, a power supply module 5, and an LED.
  • the compensation module 8 and the fan control module 9 are electrically connected to the MCU control module 4, and the temperature acquisition module 1 and the A/D conversion module 3 are electrically connected to the temperature sensing control module 2, and the protection module 7 is electrically connected.
  • the LED driving module 6 is electrically connected, the cooling fan 10 is electrically connected to the fan control module 9, and the temperature collecting module 1 is disposed at a stage light source.
  • the temperature acquisition module 1 starts to collect the temperature value at the stage light source, and then transmits the collected temperature value data to the A/D conversion module 3 through the temperature sensing control module 2.
  • Data conversion, and then the MCU control module 4 starts to read the converted data on the A/D conversion module 3, determines according to the read temperature value, selects a corresponding processing manner, including whether the cooling fan 10 is running, and the cooling fan 10 operates. Whether the speed of the LED is kept constant, whether the power of the LED light source is kept constant, and whether the protection module 7 or the like is activated. It should be pointed out that once the protection module 7 is started, the entire system will stop running and the system must be manually started after waiting for the temperature to cool.
  • the main control chip of the MCU control module 4 adopts a 32-bit MCU STM32F051, and its running frequency is 72M, and the running speed is increased to make the temperature curve smoother and the fluctuation is small.
  • the fan control module 9 includes a fan driving circuit 91, a power supply circuit 92, a fan rotation speed detecting circuit 93, and a fan failure detecting circuit 94, which are sequentially electrically connected, the fan driving circuit 91, the power supply circuit 92, and a fan. Both the rotational speed detecting circuit 93 and the fan fault detecting circuit 94 are controlled by the main control chip of the MCU control module 4.
  • the temperature collecting module 1 includes three parallel thermistors, and the three parallel thermistors are arranged between the LED light sources along the radial direction of the stage light LED light source mounting surface.
  • the MCU control module 4 controls the three thermistor rotation strobes through the temperature sensing control module 2, detects the temperature of different positions of the LED light source mounting surface, and sends the temperature analog data collected by the thermistor to the A/D conversion module. 3.
  • the A/D conversion module 3 converts the temperature value into a digital signal input MCU control module 4 to complete an acquisition process, and the center position of the LED light source mounting surface is the more concentrated the LED light source. The higher the temperature of the place, the lower the temperature as it approaches the edge of the circumference.
  • control method of the LED stage lamp temperature adaptive control system includes the following steps:
  • the power supply module 5 supplies power to the LED stage lamp temperature adaptive control system
  • Three temperature thresholds are set in the MCU control module 4, respectively, a minimum temperature value Ta, an intermediate temperature value Tb and a maximum temperature value Tc, and a temperature limit value Tm;
  • the MCU control module 4 controls, by the temperature sensing control module 2, the temperature collecting module 1 to collect data of the temperature value Tr at the stage light source every fixed period of time;
  • the temperature acquisition module 1 transmits the data of the temperature value Tr at the collected stage light source to the MCU control module 4;
  • the MCU control module 4 After receiving the data of the temperature value Tr, the MCU control module 4 compares the temperature value Tr with the set temperature threshold, and adopts the following different control strategies according to the comparison result:
  • Tr ⁇ Ta the temperature at the light source is less than the minimum value, no cooling is required, the LED light source power remains at the rated value, and the protection module 7 does not work;
  • the MCU control module 4 sends a control signal to the fan control module 9, and the fan control module 9 controls the rotation speed of the cooling fan 10 to be slow. Speed, the LED light source power maintains the rated value, and the protection module 7 does not work;
  • the MCU control module 4 sends a control signal to the fan control module 9, and the fan control module 9 controls the rotation speed of the cooling fan 10 to be high speed.
  • the LED light source power is rated, and the protection module 7 does not work;
  • the MCU control module 4 sends a control signal to the fan control module 9, and the fan control module 9 controls the speed of the cooling fan 10 to be high speed, MCU control
  • the module 4 adjusts the output power of the LED light source according to the temperature rise, and the LED driving module 6 enters the temperature compensation zone, and through the compensation module 8, the output peak current and the average current are reduced accordingly, and the LED light source power is reduced.
  • the protection module 7 does not work; if Tm ⁇ Tr, the MCU control module 4 activates the protection module 7, and turns off the output of the LED drive module 6, for protection purposes.
  • step S5 when Tc ⁇ Tr ⁇ Tm, after the MCU control module 4 reduces the power of the LED light source, it needs to re-compare with the new temperature data until the temperature at the light source is within the safe range to adjust the system working state and recover.
  • the LED light source is operated at rated power.
  • the temperature collecting module 1 collects the stage light source at a fixed time interval.
  • the average value of three times is the data of temperature value Tr, which is to maintain the system operation efficiency and the accuracy of the data; due to the different power LEDs in different environments, the real-time detection of temperature The requirements are different, so the value of the interval for a fixed period of time can be adjusted.
  • the temperature collecting module 1 transmits the data of the temperature value Tr at the collected stage light source to the temperature sensing control module 2, and then the temperature sensing control module 2 data of the temperature value Tr.
  • the data is converted to the A/D conversion module 3, and finally the A/D conversion module 3 transmits the converted data to the MCU control module 4.
  • the MCU control module 4 determines the driving current of the current driving end of the LED light source according to the LED power and temperature curve relationship diagram shown in FIG. 4, thereby controlling the power of the LED light source; If the temperature is too high, the LED light source is reduced in power, and at the same time, the cooling fan 10 is turned on, and the temperature is lowered. According to Weber Fisina's law, reducing the power of the LED light source at this time reduces the brightness without causing much influence.
  • the LED stage lamp temperature adaptive control system and the control method of the embodiment have been applied to the stage lamps, and the temperature test is performed.
  • the LED light source is operated at full power at an ambient temperature of 45 ° C, and the temperature test probe is placed at a symmetrical two points on the mounting panel close to the lamp bead to perform high temperature aging on the lamp.
  • the temperature test probe is placed at a symmetrical two points on the mounting panel close to the lamp bead to perform high temperature aging on the lamp.

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  • Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

一种LED舞台灯温度自适应控制系统及控制方法。该系统包括温度采集模块（1）、温度传感控制模块（2）、A/D转换模块（3）、MCU控制模块（4）、供电电源模块（5）、LED驱动模块（6）、保护模块（7）、补偿模块（8）、风扇控制模块（9）和冷却风扇（10），该温度传感控制模块、A/D转换模块、供电电源模块、LED驱动模块、保护模块、补偿模块和风扇控制模块均与该MCU控制模块电连接，该温度采集模块、A/D转换模块与该温度传感控制模块电连接，该保护模块与该LED驱动模块电连接，该冷却风扇与该风扇控制模块电连接。通过控制系统、控制方法和结构设计的相互配合，使得LED灯具具有良好的控温效果。

Description

一种LED舞台灯温度自适应控制系统及控制方法 技术领域
本发明涉及舞台灯技术领域，更具体地，涉及一种LED舞台灯温度自适应控制系统及控制方法。
背景技术
LED光源的舞台灯具有节能、寿命长、环保、响应速度快和容易调整等特点，其理论耗能是白炽灯的10％，荧光灯的50％，寿命是荧光灯的10倍。同时，LED白光光源无紫外光、红外光等辐射，采用树脂硅胶封装，具有结构坚固可回收利用等优点。此外，因为光色多、单色性好、发热小等特点，LED光源深受舞台照明行业青睐，目前已被广泛应用于大型舞台、歌剧院、体育场馆等演出现场。
舞台照明多采用大功率LED光源，当环境温度高于安全工作点温度时，LED内部的正向电流就会超出安全区，使LED寿命大为降低甚至损坏；且其峰值波长、辐射通量、色温等光谱特性也会受到温度极大影响，降低发光质量；LED多以透明环氧树脂封装，若结温超过固相转变温度(通常为125℃)，封装材料会向橡胶状转变并热膨胀系数骤升，从而导致LED开路和失效，影响LED舞台灯的正常使用及缩短LED的使用寿命。
发明内容
本发明为克服上述现有技术所述的至少一种缺陷，提供一种LED舞台灯温度自适应控制系统及控制方法。本发明结构简单，使用方便，通过控制系统和控制方法的相互配合，使得LED灯具具有良好的控温效果。
为解决上述技术问题，本发明采用的技术方案是：一种LED舞台灯温度自适应控制系统，其中，包括温度采集模块、温度传感控制模块、A/D转换模块、MCU控制模块、供电电源模块、LED驱动模块、保护模块、补偿模块、风扇控制模块和冷却风扇，所述温度传感控制模块、A/D转换模块、供电电源模块、LED驱动模块、保护模块、补偿模块和风扇控制模块均与所述MCU控制模块电连接，所述温度采集模块、A/D转换模块与所述温度传感控制模块电连接，所述保护模块与所述LED驱动模块电连接，所述冷却风扇与所述风扇控制模块电连接，所述温度采集模块设在舞台灯光源处。LED舞台灯温度自适应控制系统完成初始化后，温度采集模块开始采集舞台灯光源处的温度值，然后通过温度传感控制模块将采集到的温度值数据传给A/D转换模块进行数据转换，随后MCU控制模块开始读取A/D转换模块上转换后的数据，根据读取的温度值进行判定，选择相对应的处理方式，包括冷却风扇 是否运行，冷却风扇运行时转速的快慢，LED光源功率是否保持恒定，以及是否启动保护模块等。需要指出的是，一旦启动保护模块，整个系统将停止运行，必须要等待温度冷却后才可手动启动系统。
进一步的，所述MCU控制模块的主控制芯片采用32位MCU STM32F051，其运行频率为72M，运行速度提高使温度曲线更加平滑，波动小。
进一步的，所述风扇控制模块包括依次电连接的风扇驱动电路、电源电路、风扇转速检测电路以及风扇故障检测电路，所述风扇驱动电路、电源电路、风扇转速检测电路以及风扇故障检测电路均由所述MCU控制模块的主控制芯片控制。
进一步的，所述温度采集模块包括若干个并联的热敏电阻，所述若干个并联的热敏电阻沿舞台灯LED光源安装面的径向排布在LED光源之间。MCU控制模块通过温度传感控制模块控制所述若干个热敏电阻轮换选通，检测LED光源安装面不同位置的温度，并将热敏电阻采集的温度模拟数据送入A/D转换模块，A/D转换模块将温度值转换成数字信号输入MCU控制模块，完成一次采集过程，LED光源安装面的中心位置即LED光源越集中的地方温度越高，越靠近圆周边缘则温度越低。
本发明还提供一种基于上述LED舞台灯温度自适应控制系统的控制方法，其中，包括以下步骤：
S1.所述供电电源模块给LED舞台灯温度自适应控制系统供电；
S2.在所述MCU控制模块中设置3个温度阈值，分别为最小温度值Ta、中间温度值Tb和最大温度值Tc，以及1个温度极限值Tm；
S3.在系统运行时间内，所述MCU控制模块通过所述温度传感控制模块控制所述温度采集模块每间隔一段固定时间采集一次舞台灯光源处的温度值Tr的数据；
S4.所述温度采集模块(1)将采集到的舞台灯光源处的温度值Tr的数据传给所述MCU控制模块(4)；
S5.所述MCU控制模块接收到温度值Tr的数据后，将温度值Tr与设定的温度阈值进行比较，根据比较结果采取以下不同控制策略：
若Tr＜Ta，光源处的温度小于最小值，不需冷却，LED光源功率保持额定值，保护模块不工作；
若Ta＜Tr＜Tb，光源处的温度在最小值与中间值之间，LED温度优良，MCU控制模块向风扇控制模块发送控制信号，由风扇控制模块控制冷却风扇的转速为慢速，LED光源功率保持额定值，保护模块不工作；
若Tb＜Tr＜Tc，光源处的温度在中间值与最大值间，LED温度良好，MCU控制模块向风扇控制模块发送控制信号，由风扇控制模块控制冷却风扇的转速为高速，LED光源功率为额定值，保护模块不工作；
若Tc＜Tr＜Tm，光源处的温度超过安全工作温度，LED温度较差，MCU控制模块向风扇控制模块发送控制信号，由风扇控制模块控制冷却风扇的转速为高速，MCU控制模块根据温升调低LED光源的输出功率，LED驱动模块进入温度补偿区，通过补偿模块，使输出峰值电流与平均值电流随之减小，降低LED光源功率；此时，保护模块不工作；
若Tm＜Tr，MCU控制模块启动保护模块，关断LED驱动模块的输出，达到保护目的。
进一步的，所述步骤S5中，当Tc＜Tr＜Tm时，MCU控制模块降低LED光源功率后，需要与新的温度数据重新对比，直到光源处的温度在安全范围内才会调整系统工作状态，恢复LED光源到额定功率运行。
进一步的，所述步骤S3中，所述温度采集模块在每间隔一段固定时间后采集舞台灯光源处的温度值Tr的数据时，均连续采集三次，取三次的平均值为温度值Tr的数据，这是为了保持系统运作效率和数据的准确性；由于不同环境不同功率的LED，对温度检测的实时要求不同，所以所述间隔一段固定时间的数值可以调整。
进一步的，所述步骤S4中，温度采集模块将采集到的舞台灯光源处的温度值Tr的数据先传输给所述温度传感控制模块，然后温度传感控制模块将该温度值Tr的数据传给所述A/D转换模块进行数据转换，最后A/D转换模块将转换后的数据传给所述MCU控制模块。MCU控制模块读取A/D转换模块将转换后的数据后，根据LED功率和温度曲线关系图，决定LED光源的电流驱动端的驱动电流，从而控制LED光源的功率；如果温度偏高，就将LED光源降低功率，同时打开冷却风扇，温度就会降低，根据韦伯费希纳定律，此时降低LED光源功率即降低亮度，并不会造成太大影响。
与现有技术相比，本发明的有益效果：
本发明的LED舞台灯温度自适应控制系统及控制方法，针对不同工况，对LED灯具中的各个阶段的温度进行综合控制，使舞台灯LED的模块温度控制更有效率，同时也降低了舞台灯运行噪声，并且延长了LED的模块的寿命，通过在多个产品中的使用，效果良好、成本增加不多，具有良好的实用价值。
附图说明
图1是本发明LED舞台灯温度自适应控制系统原理框图。
图2是本发明中风扇控制模块的原理框图。
图3是本发明LED舞台灯温度自适应控制系统的控制方法流程图。
图4是LED功率和温度曲线关系图。
具体实施方式
附图仅用于示例性说明，不能理解为对本专利的限制；为了更好说明本实施例，附图某些部件会有省略、放大或缩小，并不代表实际产品的尺寸；对于本领域技术人员来说，附图中某些公知结构及其说明可能省略是可以理解的。附图中描述位置关系仅用于示例性说明，不能理解为对本专利的限制。
如图1所示，一种LED舞台灯温度自适应控制系统，其中，包括温度采集模块1、温度传感控制模块2、A/D转换模块3、MCU控制模块4、供电电源模块5、LED驱动模块6、保护模块7、补偿模块8、风扇控制模块9和冷却风扇10，所述温度传感控制模块2、A/D转换模块3、供电电源模块5、LED驱动模块6、保护模块7、补偿模块8和风扇控制模块9均与所述MCU控制模块4电连接，所述温度采集模块1、A/D转换模块3与所述温度传感控制模块2电连接，所述保护模块7与所述LED驱动模块6电连接，所述冷却风扇10与所述风扇控制模块9电连接，所述温度采集模块1设在舞台灯光源处。LED舞台灯温度自适应控制系统完成初始化后，温度采集模块1开始采集舞台灯光源处的温度值，然后通过温度传感控制模块2将采集到的温度值数据传给A/D转换模块3进行数据转换，随后MCU控制模块4开始读取A/D转换模块3上转换后的数据，根据读取的温度值进行判定，选择相对应的处理方式，包括冷却风扇10是否运行，冷却风扇10运行时转速的快慢，LED光源功率是否保持恒定，以及是否启动保护模块7等。需要指出的是，一旦启动保护模块7，整个系统将停止运行，必须要等待温度冷却后才可手动启动系统。
本实施例中，所述MCU控制模块4的主控制芯片采用32位MCU STM32F051，其运行频率为72M，运行速度提高使温度曲线更加平滑，波动小。
如图2所示，所述风扇控制模块9包括依次电连接的风扇驱动电路91、电源电路92、风扇转速检测电路93以及风扇故障检测电路94，所述风扇驱动电路91、电源电路92、风扇转速检测电路93以及风扇故障检测电路94均由所述MCU控制模块4的主控制芯片控制。
本实施例中，所述温度采集模块1包括3个并联的热敏电阻，所述3个并联的热敏电阻沿舞台灯LED光源安装面的径向排布在LED光源之间。MCU控制模块4通过温度传感控制模块2控制所述3个热敏电阻轮换选通，检测LED光源安装面不同位置的温度，并将热敏电阻采集的温度模拟数据送入A/D转换模块3，A/D转换模块3将温度值转换成数字信号输入MCU控制模块4，完成一次采集过程，LED光源安装面的中心位置即LED光源越集中 的地方温度越高，越靠近圆周边缘则温度越低。
本实施例中上述LED舞台灯温度自适应控制系统的控制方法，如图3所示，包括以下步骤：
S1.所述供电电源模块5给LED舞台灯温度自适应控制系统供电；
S2.在所述MCU控制模块4中设置3个温度阈值，分别为最小温度值Ta、中间温度值Tb和最大温度值Tc，以及1个温度极限值Tm；
S3.在系统运行时间内，所述MCU控制模块4通过所述温度传感控制模块2控制所述温度采集模块1每间隔一段固定时间采集一次舞台灯光源处的温度值Tr的数据；
S4.所述温度采集模块1将采集到的舞台灯光源处的温度值Tr的数据传给所述MCU控制模块4；
S5.所述MCU控制模块4接收到温度值Tr的数据后，将温度值Tr与设定的温度阈值进行比较，根据比较结果采取以下不同控制策略：
若Tr＜Ta，光源处的温度小于最小值，不需冷却，LED光源功率保持额定值，保护模块7不工作；
若Ta＜Tr＜Tb，光源处的温度在最小值与中间值之间，LED温度优良，MCU控制模块4向风扇控制模块9发送控制信号，由风扇控制模块9控制冷却风扇10的转速为慢速，LED光源功率保持额定值，保护模块7不工作；
若Tb＜Tr＜Tc，光源处的温度在中间值与最大值间，LED温度良好，MCU控制模块4向风扇控制模块9发送控制信号，由风扇控制模块9控制冷却风扇10的转速为高速，LED光源功率为额定值，保护模块7不工作；
若Tc＜Tr＜Tm，光源处的温度超过安全工作温度，LED温度较差，MCU控制模块4向风扇控制模块9发送控制信号，由风扇控制模块9控制冷却风扇10的转速为高速，MCU控制模块4根据温升调低LED光源的输出功率，LED驱动模块6进入温度补偿区，通过补偿模块8，使输出峰值电流与平均值电流随之减小，降低LED光源功率。此时，保护模块7不工作；若Tm＜Tr，MCU控制模块4启动保护模块7，关断LED驱动模块6的输出，达到保护目的。
所述步骤S5中，当Tc＜Tr＜Tm时，MCU控制模块4降低LED光源功率后，需要与新的温度数据重新对比，直到光源处的温度在安全范围内才会调整系统工作状态，恢复LED光源到额定功率运行。
所述步骤S3中，所述温度采集模块1在每间隔一段固定时间后采集舞台灯光源处的 温度值Tr的数据时，均连续采集三次，取三次的平均值为温度值Tr的数据，这是为了保持系统运作效率和数据的准确性；由于不同环境不同功率的LED，对温度检测的实时要求不同，所以所述间隔一段固定时间的数值可以调整。
所述步骤S4中，温度采集模块1将采集到的舞台灯光源处的温度值Tr的数据先传输给所述温度传感控制模块2，然后温度传感控制模块2将该温度值Tr的数据传给所述A/D转换模块3进行数据转换，最后A/D转换模块3将转换后的数据传给所述MCU控制模块4。MCU控制模块4读取A/D转换模块3将转换后的数据后，根据图4所示的LED功率和温度曲线关系图，决定LED光源的电流驱动端的驱动电流，从而控制LED光源的功率；如果温度偏高，就将LED光源降低功率，同时打开冷却风扇10，温度就会降低，根据韦伯费希纳定律，此时降低LED光源功率即降低亮度，并不会造成太大影响。
本实施例的LED舞台灯温度自适应控制系统及控制方法已在舞台灯具上应用，并进行了温度测试实验。
在8:00-14:00的测试时间内，在环境温度45℃下，使LED光源满功率运行，将温度测试探头放置在靠近灯珠的安装面板上的对称两点，对灯具进行高温老化实验，以20min为一时间节点取值。实验结果表明，在8:00-8:20时，LED光源温度在46℃及以下，风扇不转动；在8:40-10:20时，LED光源温度在46℃-54℃之间，风扇低速转动，以上LED光源都是满功率运行；在10:40-1400时，风扇高速转动，LED光源降功率运行，直到温度降到54℃以下，完成系统温度自动控制。其中一段测试数据如表1所示。
表1 舞台灯LED温度测试实验数据
时间 LED温度(℃) 风扇电压(V) LED功率(％)
8:00 26.9 0 100
8:20 37.6 0 100
8:40 45.1 0 100
9:00 46.0 4 100
9:20 48.3 5 100
9:40 50.4 6 100
10:00 52.0 7 100
10:20 54.0 8 100
10:40 56.2 8 99
11:00 57.9 9 99
11:20 59.6 9 99
11:40 58.3 10 99
12:00 55.8 10 99
12:20 54.0 10 99
12:40 51.9 9 100
13:00 50.4 8 100
13:20 57.5 8 100
13:40 45.7 7 100
14:00 45.5 6 100
显然，本发明的上述实施例仅仅是为了清楚地说明本发明所作的举例，而并非是对本发明的实施方式的限定。对于所属领域的普通技术人员来说，在上述说明的基础上还可以做出其它不同形式的变化或变动。这里无需也无法对所有的实施方式予以穷举。凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明权利要求的保护范围之内。

Claims (8)

  1. 一种LED舞台灯温度自适应控制系统，其特征在于，包括温度采集模块(1)、温度传感控制模块(2)、A/D转换模块(3)、MCU控制模块(4)、供电电源模块(5)、LED驱动模块(6)、保护模块(7)、补偿模块(8)、风扇控制模块(9)和冷却风扇(10)，所述温度传感控制模块(2)、A/D转换模块(3)、供电电源模块(5)、LED驱动模块(6)、保护模块(7)、补偿模块(8)和风扇控制模块(9)均与所述MCU控制模块(4)电连接，所述温度采集模块(1)、A/D转换模块(3)与所述温度传感控制模块(2)电连接，所述保护模块(7)与所述LED驱动模块(6)电连接，所述冷却风扇(10)与所述风扇控制模块(9)电连接，所述温度采集模块(1)设在舞台灯光源处。
  2. 根据权利要求1所述的一种LED舞台灯温度自适应控制系统，其特征在于，所述MCU控制模块(4)的主控制芯片采用32位MCU STM32F051，其运行频率为72M。
  3. 根据权利要求2所述的一种LED舞台灯温度自适应控制系统，其特征在于，所述风扇控制模块(9)包括依次电连接的风扇驱动电路(91)、电源电路(92)、风扇转速检测电路(93)以及风扇故障检测电路(94)，所述风扇驱动电路(91)、电源电路(92)、风扇转速检测电路(93)以及风扇故障检测电路(94)均由所述MCU控制模块(4)的主控制芯片控制。
  4. 根据权利要求1所述的一种LED舞台灯温度自适应控制系统，其特征在于，所述温度采集模块(1)包括若干个并联的热敏电阻，所述若干个并联的热敏电阻沿舞台灯LED光源安装面的径向排布在LED光源之间。
  5. 一种基于根据权利要求1到4任一所述的LED舞台灯温度自适应控制系统的控制方法，其特征在于，包括以下步骤：
    S1.所述供电电源模块(5)给LED舞台灯温度自适应控制系统供电；
    S2.在所述MCU控制模块(4)中设置3个温度阈值，分别为最小温度值Ta、中间温度值Tb和最大温度值Tc，以及1个温度极限值Tm；
    S3.在系统运行时间内，所述MCU控制模块(4)通过所述温度传感控制模块(2)控制所述温度采集模块(1)每间隔一段固定时间采集一次舞台灯光源处的温度值Tr的数据；
    S4.所述温度采集模块(1)将采集到的舞台灯光源处的温度值Tr的数据传给所述MCU控制模块(4)；
    S5.所述MCU控制模块(4)接收到温度值Tr的数据后，将温度值Tr与设定的温度阈值进行比较，根据比较结果采取以下不同控制策略：
    若Tr＜Ta，光源处的温度小于最小值，不需冷却，LED光源功率保持额定值，保护模块(7) 不工作；
    若Ta＜Tr＜Tb，光源处的温度在最小值与中间值之间，LED温度优良，MCU控制模块(4)向风扇控制模块(9)发送控制信号，由风扇控制模块(9)控制冷却风扇(10)的转速为慢速，LED光源功率保持额定值，保护模块(7)不工作；
    若Tb＜Tr＜Tc，光源处的温度在中间值与最大值间，LED温度良好，MCU控制模块(4)向风扇控制模块(9)发送控制信号，由风扇控制模块(9)控制冷却风扇(10)的转速为高速，LED光源功率为额定值，保护模块(7)不工作；
    若Tc＜Tr＜Tm，光源处的温度超过安全工作温度，LED温度较差，MCU控制模块(4)向风扇控制模块(9)发送控制信号，由风扇控制模块(9)控制冷却风扇(10)的转速为高速，MCU控制模块(4)根据温升调低LED光源的输出功率，LED驱动模块(6)进入温度补偿区，通过补偿模块(8)，使输出峰值电流与平均值电流随之减小，降低LED光源功率；此时，保护模块(7)不工作；
    若Tm＜Tr，MCU控制模块(4)启动保护模块(7)，关断LED驱动模块(6)的输出，达到保护目的。
  6. 根据权利要求5所述的控制方法，其特征在于，所述步骤S5中，当Tc＜Tr＜Tm时，MCU控制模块(4)降低LED光源功率后，需要与新的温度数据重新对比，直到光源处的温度在安全范围内才会调整系统工作状态，恢复LED光源到额定功率运行。
  7. 根据权利要求5所述的控制方法，其特征在于，所述步骤S3中，所述温度采集模块(1)在每间隔一段固定时间后采集舞台灯光源处的温度值Tr的数值时，均连续采集三次，取三次的平均值为温度值Tr的数据。
  8. 根据权利要求5所述的控制方法，其特征在于，所述步骤S4中，温度采集模块(1)将采集到的舞台灯光源处的温度值Tr的数据先传输给所述温度传感控制模块(2)，然后温度传感控制模块(2)将该温度值Tr的数据传给所述A/D转换模块(3)进行数据转换，最后A/D转换模块(3)将转换后的数据传给所述MCU控制模块(4)。
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CN112020272A (zh) * 2020-07-28 2020-12-01 福建星云电子股份有限公司 一种充电桩风机调速系统及方法
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CN117939760B (zh) * 2024-03-21 2024-05-28 山东正大电器安装工程有限公司 一种舞台灯光智能化控制方法及系统

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