• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    PURPOSE: An apparatus for sustaining and controlling an optical output in an LED signal lamp for compensating temperature is provided to sustain the optical output of LEDs of the LED signal lamp within ±20 percents by compensating a resistance value of an optical sensor according to a variation of atmospheric temperature. CONSTITUTION: An apparatus for sustaining and controlling an optical output in an LED signal lamp for compensating temperature includes a constant current control portion(110), a sensor output portion(120), a reference voltage portion(130), a power control portion(140), a power output portion(160), and a current limit portion(150). The constant current control portion(110) controls constantly a current value applied to a sensor terminal. The sensor output portion(120) is formed with an optical sensor for measuring the intensity of light and a temperature sensor for compensating a resistance value of the optical sensor. The reference voltage portion(130) sets up a current limit value to prevent the over-current. The power control portion(140) outputs a control signal to sustain the reference light intensity. The power output portion(160) supplies the power to an LED module according to the control signal of the power control portion(140). The current limit portion(150) restricts the current larger than the reference current by sensing the current of the power output portion(160).
    公开号:KR20030080175A
    申请号:KR1020020065406
    申请日:2002-10-25
    公开日:2003-10-11
    发明作者:박주호；이종규
    申请人:(주)아텔스；(주)케이엘테크；
    IPC主号:
    专利说明:

    A temperature compensated LED traffic signal module controller for maintaining constant luminous intensity
    [5] The present invention relates to a controller capable of maintaining a constant light output by compensating for the change in the ambient temperature at the installation location of the light output of the LED signal lamp.
    [6] In general, traffic signals for vehicles and pedestrians are installed around roads to facilitate traffic flow. In the case of the traffic light, conventionally, only the blinking function was performed by using the incandescent lamp of the filament type to blink the traffic light. Incandescent bulbs have a problem in that they have to be replaced frequently because of high power consumption and high maintenance cost and short life span of the filament inside the bulb.
    [7] In order to solve this problem, a traffic light having an LED (Light Emitting Diode) has been widely used in recent years. LEDs use the principle of emitting light when holes and electrons recombine when biasing in the forward direction during PN bonding. LEDs can operate with low voltage and low current, have high efficiency, low power consumption, and very long life compared to light bulbs, and are widely used as display devices of electric measuring devices including traffic signals.
    [8] LED traffic light has the advantage of saving 80% ~ 90% of power consumption than conventional incandescent bulbs by using LED element as light source. Therefore, many countries around the world have been replacing LED signal lamps for electricity conservation since long time ago, and Korea is planning to implement them.
    [9] However, LED signal lamps have the advantage of low power consumption, which makes them electricity-saving. In addition, the LED test standard in Korea limits the light output variation according to temperature to within ± 20% between -30 ℃ and + 70 ℃ based on 25 ℃ of atmospheric temperature. However, the current high-brightness LEDs (red, green, yellow) show a change in light output from 25% to 50% depending on the temperature. Therefore, there is a need for a controller that can maintain the light output of LED signal lamps within ± 20% according to temperature.
    [10] The general LED traffic light is composed of a structure that turns on the LED signal by switching the DC component by applying a commercial power of 110 / 220V to the stop. The development of such LED traffic lights mainly relates to an apparatus for effectively improving brightness by adjusting on / off and switching of lighting signals and arrangement of LEDs by control signals. Among them, a technology related to the output of the LED signal lamp is a "concentrated output light emitting diode signal lamp driving circuit" filed in Korean Patent Application No. 1999-057211. The present invention relates to a concentrated output LED signal lamp driving circuit in which the driving current and the light output of the LED are automatically changed according to the external temperature, and the object of the present invention is similar to the present invention. However, the above invention drives a LED module with a constant current by applying only a thermistor, which is a temperature sensor, as a method for producing a constant light output. This method is applicable only when the variation of LED light output by temperature changes is similar to the temperature curve of thermistor. It is not applicable when the variation of LED light output is slightly different from the temperature curve of thermistor. There is no reproducibility as a light maintenance controller for traffic lights (red, blue, yellow).
    [11] Another conventional technology is a technology filed in Republic of Korea Utility No. 2001-19656, there is a "light amount control device for LED traffic lights". The purpose of this design is to configure the external light (day and night) and the atmospheric condition (fog or no fog) by using the light sensor and the temperature sensor to control the amount of LED signal light in connection with the power supply. The purpose is to adjust the brightness of the LED traffic light according to the ambient brightness. As a result, the technology is unable to maintain ± 20% brightness over the outside temperature (-30 ° C to + 70 ° C) at the location where the LED light is installed.
    [12] An object of the present invention is to provide a controller capable of maintaining the LED signal light output in response to changes in the ambient temperature within ± 20%.
    [13] Another object of the present invention is to control the power consumption of the LED module according to the brightness change of the LED.
    [14] LED signal light maintaining controller according to the present invention for achieving these objects is a constant current control unit for controlling a constant value of the current applied to the sensor stage from the DC power source converted by the power supply; A sensor output unit configured to include an optical sensor for measuring the intensity of light output from one of the LED modules, and a temperature sensor for compensating for a change in the resistance of the optical sensor according to temperature; A reference voltage unit which sets a desired reference luminance to a voltage value and sets a current limit value for preventing overcurrent; A power control unit for outputting a control signal for maintaining the reference luminance by comparing the voltage of the reference luminance output from the reference voltage unit with the luminance change value output from the sensor output unit; A power output unit which receives the control signal of the power control unit and supplies changed power to the LED module; And a current limiting unit configured to sense a current greater than the reference current by sensing a current of the power output unit.
    [15] LED light output maintenance controller according to the present invention includes a constant voltage control unit 210 for constantly supplying the power supply from the secondary output terminal of the switching mode voltage supply (SMPS) to the LED module; Sensor unit 220 including a photodiode (PD) for measuring the brightness of the light output from one of the LED module LED, and reference value control unit 230 for setting a voltage for adjusting the reference brightness and limit the overcurrent Wow; An optical sensor controller 240 for converting a current value of the optical sensor into a voltage value; An overcurrent prevention unit (250) for sensing a current flowing in the light sensing LED and outputting a control signal by comparing the reference value provided by the reference value adjusting unit (230); And a control signal blocking unit 260 which blocks the brightness change value output from the sensor output unit during overcurrent and maintains the reference value of the switch mode power supply.
    [1] 1 is an overall configuration diagram of an LED signal lamp applying a light output maintaining controller according to an embodiment of the present invention,
    [2] 2 is a configuration diagram showing the configuration of the LED light output maintenance controller of FIG.
    [3] 3 is an overall configuration diagram of an LED signal lamp to which the light output maintaining controller according to another embodiment of the present invention;
    [4] 4 is a configuration diagram showing the configuration of the LED light output maintenance controller of FIG.
    [16] Hereinafter, the configuration and operation of the LED light output maintenance controller of the LED signal lamp according to the present invention with reference to the accompanying drawings will be described.
    [17] 1 is an overall configuration diagram of an LED signal lamp applying the LED light output maintaining controller according to an embodiment of the present invention. Switching Mode Power Supply (SMPS) that receives AC power (AC 90V ~ AC 245V), which is the traffic light control power, and converts it into DC power and LED light output that can keep the light output of LED light source constant It consists of a maintenance module 100 and an LED module consisting of a plurality of LEDs that emit light using a power provided through the controller 100.
    [18] 2 is a configuration diagram showing the configuration of the LED light output maintenance controller 100 shown in FIG. As shown, the constant current control unit 110 for constantly controlling the value of the current applied to the sensor stage from the DC power converted by the power supply; Sensor output consisting of a light sensor (CdS) for measuring the intensity of light output from one of the LED module, and a temperature sensor (NTC) for compensating for the change in the resistance value of the light sensor (CdS) according to the temperature Unit 120; A reference voltage unit 130 for outputting a voltage value of the reference luminance so as to set a desired reference luminance and current limit; A power controller 140 for outputting a control signal for maintaining the reference brightness by comparing the voltage of the reference brightness output from the reference voltage unit 130 with the brightness change value output from the sensor output unit 120; A power output unit 160 which receives the control signal of the power controller 140 and supplies the changed power to the LED module; And a current limiter 150 that senses an output current of the power output unit 160 to limit a current larger than a reference current.
    [19] The LED light output maintenance controller 100 according to the present invention receives a constant DC power supply through a power converter and sets the reference luminance and the current limit value at an atmospheric temperature of 25 ° C. Sensing the intensity of one of the light sources of the LED module. As the brightness of the LED changes, the power supplied to the LED module is controlled to maintain the reference brightness to maintain a constant light output. The current limiting circuit is used to limit the current to prevent excessive current from flowing during control.
    [20] The constant current controller 110 is used as a constant current source using a voltage regulator, and can adjust the value of the applied current using the resistor R. The constant current is supplied to the temperature compensation sensor NTC and the optical sensor CdS. The constant current control unit 110 circuit can be configured using a transistor and other active elements.
    [21] The sensor output unit 120 uses an optical sensor CdS (cadmium sulfide) and an optical sensor temperature compensation NTC thermistor (Negative Temperature Coefficient Thermistor). One LED of the LED module and CdS, which is a light sensor, are configured as one module and are configured on the front of the LED module together with the thermistor. NTC thermistor is a sensor that uses the characteristic that the resistance decreases when the temperature of the resistor rises, and it is used by converting the temperature by detecting the change of voltage by flowing a current. The sensor output unit 120 compensates the temperature of the optical sensor according to the temperature and outputs a change value of the optical sensor as a voltage.
    [22] The power output unit 160 is a driver device that supplies power to the LED module and receives the control input from the power controller 140 to output the changed power. Connect one LED of the front LED module receiving the output signal of the power output unit 60 to the control board. The light intensity of the LED changes with temperature, thereby changing the resistance value of the optical sensor CdS. Both terminals of the optical sensor CdS output a voltage changed by light. However, the optical sensor (CdS) uses an NTC thermistor to compensate for this because the resistance changes with temperature.
    [23] The reference voltage unit 130 allows the reference voltage value to be adjusted to set a desired reference brightness and current limit.
    [24] The power control unit 140 outputs a control signal to maintain the reference luminance by comparing the voltage of the reference luminance output from the reference voltage unit 130 with the intensity change value output from the sensor output unit 120 using a comparator. The voltage is controlled to maintain the initial reference value even if the temperature changes by comparing the reference value of the desired brightness with the amount of light change. The OP AMP can be simply used to construct a comparator, but a control with an analog-to-digital (A / D) converter can be used to precisely output control signals to the program.
    [25] The current limiter 150 sets the maximum driving current in the reference voltage unit 130 to control the current greater than the reference current compared to the current sensed by the power output unit 160 to perform the current limit. The circuit is simply configured to control the comparison of reference current and sensing current using OP AMP, but it is also possible to precisely control current with a program using a processor with an A / D converter.
    [26] 3 is an overall configuration diagram of an LED signal lamp to which the LED light output maintaining controller according to another embodiment of the present invention is applied. Unlike the embodiment of FIGS. 1 and 2, the control signal of the maintenance controller 200 is provided in a feedback form to the power supply. That is, the method of maintaining the brightness by controlling the output voltage of the Switching Mode Power Supply (SMPS) that supplies the DC power to the LED using an optical sensor such as a photodiode is applied according to the temperature. Circuit.
    [27] 4 is a configuration diagram showing the configuration of the LED light output maintenance controller of FIG. It is provided with components similar to the embodiment shown in Figure 2, the operation principle is similar.
    [28] As shown, the constant voltage control unit 210 for constantly supplying the power supply from the secondary output terminal of the switching mode power supply (SMPS) to the LED module; Sensor unit 220 including a photodiode (PD) for measuring the brightness of the light output from one of the LED module LED, and reference value control unit 230 for setting a voltage for adjusting the reference brightness and limit the overcurrent Wow; An optical sensor controller 240 for preventing overcurrent from flowing through the LED module; An overcurrent prevention unit (250) for sensing a current flowing in the light sensing LED and outputting a control signal by comparing the reference value provided by the reference value adjusting unit (230); It includes a control signal blocking unit 260 for blocking the light intensity change value output from the sensor output unit during overcurrent and maintains the reference value of the switch mode power supply.
    [29] Unlike the embodiment of FIG. 2, the LED light output maintaining controller 200 senses the intensity of one of the light sources of the LED module and supplies a predetermined power to the LED module to maintain a reference intensity according to the change in the intensity of the LED. The feeder (SMPS) is controlled to maintain a constant light output.
    [30] The reference value control unit 230 sets the allowable current value for preventing the over-current and the brightness of the LED module at the ambient temperature 25 ℃. The setting method determines a value of Rg, which is the gain resistance of the photosensor control unit 240, according to the LED color (wavelength), and then adjusts the resistance value for the reference luminance to adjust the desired reference luminance. At this time, the initial voltage value of the switch mode power supply (SMPS) should match the voltage value outputting the reference luminance. In addition, after the allowable current value is determined to prevent overcurrent, select a resistor suitable for the allowable current value.
    [31] The optical sensor unit 220 outputs a single LED light in the LED module by using a photodiode (or Cds: cadmium sulfide) as a light sensor to change the intensity of light with a current value (or resistance). .
    [32] The optical sensor controller 240 is received as an inverting terminal (-) as an example of a circuit for converting the light amount of the optical sensor detected by the optical sensor unit 220 to a voltage value using the OP AMP, and the non-inverting terminal ( +) Receives the reference voltage Vref 2 set by the reference value adjusting unit 230. The amount of change in the current output from the optical sensor unit 220 is changed into a voltage, and the voltage gain is used for the temperature compensation of the optical sensor PD using the voltage gain resistor Rg and NTC. In addition, the reference value adjusting unit 230 adjusts the voltage value to match the reference brightness, and outputs a control voltage. Therefore, the circuit of the optical sensor 240 may use all the circuits that can convert the current value of the optical sensor into a voltage value, and in the case of using Cds (cadmium sulfide) using the OP AMP to convert the resistance of the Cds to voltage values Any circuit that can be used can be used.
    [33] The overcurrent protection unit 250 suddenly decreases the output voltage of the light sensor controller 240 when the light intensity suddenly decreases or the light intensity does not come out due to an abnormality or failure of the light sensing LED, and the output of the switch mode power supply SMPS. Is rapidly increased so that overcurrent can be supplied to the LED module and destroy the LED. Therefore, the current flowing through the LED module is sensed to control the output of the light sensing controller 100 using a comparator.
    [34] The control signal blocking unit 260 generates an abnormal voltage in the optical sensor control unit 240, and if the voltage of the switch mode power supply (SMPS) increases rapidly, the optical sensor control unit 240 if the overcurrent protection unit 250 exceeds the allowable current value. Blocks the control signal to maintain the reference voltage of the switch mode power supply (SMPS) to prevent the abnormality of the signal lamp itself due to the abnormality of the light-sensing LED, optical sensor and peripheral circuit.
    [35] The output signal of the optical sensor controller 240 is connected to an intermediate terminal of the variable resistor of the constant current controller 210 via the control signal blocking unit 260 and is transmitted to a reference voltage IC. The light intensity of the LED module is increased by increasing the output of V 0 when the light sensing voltage value V 2 by the photosensor control unit 240 is smaller than the voltage V 1 that determines the initial value of the power supply output voltage V 0 . If V 2 is greater than V 1 , the output voltage of the power supply that directly supplies power to the LED module according to the change of the brightness is directly controlled by using the optical sensor by reducing the V 0 output.
    [36] If the current flowing through the light-sensing LED is normal, the difference between the voltage applied to the inverting terminal (-) of the comparator included in the overcurrent protection unit 250 and the reference voltage Vref 1 is less than or equal to a predetermined value. The switch of 260 remains connected. If the light sensing LED is abnormal, the difference from the reference voltage (Vref 1) is out of a certain value, so the LED according to the brightness change output from the light sensor control unit 240 by shutting off the switch of the control signal blocking unit 260. The control signal applied to the module is essentially blocked and maintained at the reference value of the switching mode power supply (SMPS) to prevent overcurrent from flowing to the LED module due to incorrect control.
    [37] The present invention greatly improves the power consumption to suit the high efficiency of direct control of the voltage of the switch mode power supply (SMPS) so as to maintain the reference brightness at all times even when the external temperature is changed by setting the desired reference brightness, a photodiode as an inexpensive optical sensor Light control was performed using (PD) and cadmium sulfide (CdS). An overcurrent protection circuit was configured to protect the LED module.
    [38] As described above, the LED light output maintenance controller according to the present invention has the effect of maintaining the LED light output of the LED signal lamp within ± 20% by compensating for the change in the optical sensor resistance value according to the change in the atmospheric temperature. In addition, the LED signal lamp using all the switch mode power supply (SMPS) is configured as a module to enable light maintenance by simply applying the controller of the present invention.
    权利要求:
    Claims (3)
    [1" claim-type="Currently amended] In the LED light output maintenance controller of the LED signal lamp for keeping the light output of the light emitting diode (LED) used for the LED traffic signal lamp constant:
    A constant current controller 110 which constantly controls the value of the current applied to the sensor terminal from the DC power converted by the power supply;
    A sensor output unit 120 configured to include an optical sensor for measuring the intensity of light output from one of the LED modules, and a temperature sensor for compensating for a change in a resistance value of the optical sensor according to temperature;
    A reference voltage unit 130 for setting a desired reference luminance to a voltage value and setting a current limit value for preventing overcurrent;
    A power control unit 140 for outputting a control signal for maintaining the reference brightness by comparing the voltage of the reference brightness output from the reference voltage unit with the brightness change value output from the sensor output unit;
    A power output unit 160 receiving the control signal of the power control unit and supplying the changed power to the LED module;
    It includes a current limiting unit 150 for limiting the current larger than the reference current by sensing the current of the power output unit receives a constant voltage from the power supply to the LED module using the optical sensor to change the power value according to the brightness change Light output maintenance controller of the temperature compensation LED signal light, characterized in that the supply.
    [2" claim-type="Currently amended] [Claim 2] The light output of claim 1, wherein the optical sensor cadmium sulfide (CdS) and the LED element are configured as a single module and positioned in front of the LED module together with a thermistor. Controller.
    [3" claim-type="Currently amended] In the LED light output maintenance controller of the temperature compensation LED signal lamp for keeping the light output of the light emitting diode (LED) used in the LED traffic signal lamp constant:
    A sensor unit 220 including a photodiode PD for measuring the intensity of light output from one of the LED modules;
    A reference value adjusting unit 230 for setting a voltage for adjusting the reference brightness and limiting the overcurrent;
    An optical sensor controller 240 for outputting a current flowing through the photodiode sensing the LED brightness as a voltage value;
    An overcurrent prevention unit 250 for preventing overcurrent from flowing through the LED module;
    It comprises a control signal blocking unit 260 for blocking the light intensity change value output from the sensor output unit during overcurrent and maintains the reference value of the switch mode power supply,
    When the light sensing voltage value V 2 by the photosensor control unit 240 is smaller than the voltage V 1 that determines the initial value of the power supply output voltage V 0 , the light intensity of the LED module is increased by increasing the V 0 output. When V 2 is greater than V 1 , the output voltage of the power supply that directly supplies power to the LED module according to the change in brightness by using the optical sensor is controlled by reducing the V 0 output. LED light output maintenance controller of compensation LED signal lamp.
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    同族专利:
    公开号 | 公开日
    KR200285442Y1|2002-08-13|
    KR100497813B1|2005-07-01|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    2002-04-06|Priority to KR1020020018791
    2002-04-06|Priority to KR1020020018791
    2002-10-25|Application filed by (주)아텔스, (주)케이엘테크
    2003-10-11|Publication of KR20030080175A
    2005-07-01|Application granted
    2005-07-01|Publication of KR100497813B1
    优先权:
    申请号 | 申请日 | 专利标题
    KR1020020018791|2002-04-06|
    KR1020020018791|2002-04-06|
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