KR101289438B1 - A power supply for led traffic light capable of controlling luminous-intensity in dimming control mode - Google Patents

Abstract

PURPOSE: A light emitting diode (LED) traffic light power device with a luminance control function in a dimming control is provided to optimize the light intensity of a traffic light as the power consumed by a temperature compensation unit in a dimming control is automatically controlled to be bypass-output to the traffic light. CONSTITUTION: A rectifier (100) outputs an AC voltage input by a traffic signal controller by rectifying. If the voltage output by the rectifier is not a normal voltage, a voltage detection unit (200) cuts off a voltage supply to an LED traffic light. A constant voltage maintaining unit (300) maintains the voltage rectified by the rectifier properly. A temperature compensation unit (400) compensates a DC power supply to the LED traffic light by controlling a resistance value caused by a temperature change. A dummy load (600) is connected to the rear end of the rectifier. [Reference numerals] (10) Traffic signals controller; (100) Rectifier; (200) Voltage detection unit; (30) Traffic lights; (300) Constant voltage maintaining unit; (400) Temperature compensation unit; (510) Auxiliary power supply unit; (530) Pulse conversion unit; (550) Waveform detection unit; (570) Control switch unit; (600) Dummy load; (700) Optical power control unit

Description

LED signal light power supply with brightness control function in dimming control {A power supply for LED traffic light capable of controlling Luminous-intensity in dimming control mode}

The present invention relates to a LED signal light power supply having a brightness control function in the control of the dimming control, automatic control to bypass the power consumed by the temperature compensator in the power supply to the signal output during the night light control dimming, The present invention relates to an LED signal light power supply having a brightness control function during dimming control configured to optimize the brightness of a traffic light at the time of control to an appropriate level with improved visibility.

Traffic lights are used to ensure safe traffic order on the roads on which vehicles run. The traffic light is usually configured to combine the basic traffic lights such as red (R, R), yellow (Y, low, Y), green (G), and arrow (Arrow, A) to form one equalizer. The lighting is controlled to suit the road environment. Recently, power consumption is about one eighth of that of a conventional incandescent signal lamp, and the use of LED (Light Emitting Diode) signal lamps having an energy saving effect of about 80 to 90% at the same brightness is spreading.

1 is an example of a system block diagram of a conventional traffic signal, and FIG. 2 is an example of a signal transmission conceptual diagram of a conventional signal driver.

Looking at the illustrated traffic signal, it is composed of a main control unit (MCU, Main Control Unit) and a signal driving unit (SCU, Signal Control Unit), each having a separate central computing unit (CPU).

The main control unit is a unit computing system that plays a pivotal role in the traffic signal, and mainly performs the functions such as processing traffic information such as detector data, processing control algorithms, communicating with the control center, and connecting the man machine interface (MMI). It is configured to enable additional functions.

The signal driver directly controls the turn on and off of the traffic light according to the command of the main control part, and improves the stability of the system through the fail-safe control function that performs basic signal output control in the event of a failure of the main control part.

The signal driver receives the signal progress command of the main controller to perform the electric output of the signal lamp and monitor the output result, for example, a controller board (or controller unit) instructing the registered output by time progress, and for driving the signal lamp. The LSU, which controls and monitors the output, and the flasher, which performs flashing control in case of emergency, are connected to one system bus. The lamp driving device (LSU) can be understood as an LED traffic light power supply in view of the power supply to the traffic light.

On the other hand, the conventional traffic signal is configured to execute the night dimming control mode to adjust the brightness of the traffic light in order to prevent the glare of the driver and reduce power consumption during the late night time zone.

In order to improve various limitations of the LED traffic light power supply device in the night dimming control mode, Korean Patent No. 10-0869115 (registration date 2008.11.11.) Has been proposed by the present inventors as a prior art.

In the prior art, the dimming control signal provided from the traffic signal controller is provided only to the rectifying and constant voltage control process, and then provided to the LED signal lamp. In addition, when the driving power input from the traffic signal controller is a dimming control signal, the power consumption is increased through a dummy resistor to prevent an operation state detection error due to low power consumption during the dimming control operation. It provided several advantages.

However, in spite of these advantages, the prior art had some limitations in terms of the brightness of the traffic light in the dimming control.

That is, in the prior art, the power applied from the traffic signal controller to the rectifier is an abnormal voltage such as a detection signal for detecting a leakage current or an operation state of a traffic light, a normal lighting signal that is a normal LED driving voltage, and a night time signal. And a dimming control lighting signal. Among these, the normal lighting signal is a full sine wave type or a radio wave signal rectified by the input AC power, and the dimming control signal takes a half wave or a half wave signal rectified therefrom. Since the light is supplied to the signal lamp power supply, it provides about 50% of the luminous intensity compared to the normal lighting signal, and in some power loss, the actual luminous intensity may be less than 50%.

However, even if night dimming control is performed to prevent the driver's glare during the night operation of the traffic light, it is not necessary to reduce the brightness to 50% of the level compared to the normal lighting, but in some cases higher than 50%, eg For example, even if it is more suitable to ensure the visibility of lighting the traffic light with a light intensity of about 70%, the prior art had a limit that there was no separate control means for this.

The present invention has been made in view of the above-mentioned problems, and automatically controls the power consumed by the temperature compensator in the power supply device to be bypassed at the time of night signal light dimming control to be output as a traffic light, thereby controlling the brightness of the signal light during the light control. An object of the present invention is to provide an LED signal lamp power supply with brightness control function in dimming control configured to optimize the visibility to an appropriate level.

According to an aspect of the present invention for achieving the above object, the LED signal light power supply for supplying DC power for normal lighting or dimming control lighting by receiving an AC or DC power from the traffic signal controller, the LED signal light, If the voltage input from the traffic signal controller is an AC voltage rectifying and outputting, if the DC voltage rectifying unit for outputting it as it; A voltage detector for detecting a voltage output from the rectifier and blocking supply of voltage to the LED signal when the detected voltage is not a normal voltage; A constant voltage holding unit configured to maintain the voltage rectified by the rectifying unit at an appropriate voltage; A temperature compensator having a resistor and a thermistor and performing compensation of a DC power supplied to the LED signal lamp by controlling a resistance value according to a temperature change; A dummy load connected to a rear end of the rectifier; And a first switching element electrically connected to the rectifying unit and the dummy load, the first switching element being connected in series with the dummy load, and analyzing the waveform of the voltage rectified by the rectifying unit, when the waveform is a radio signal which is a normal lighting signal. A load control unit which turns off the first switching element to prevent current from flowing in the dummy load, and when the waveform is a half wave signal that is a dimming control signal, turns on the first switching element to control current to flow in the dummy load ; And an optical output controller connected to an output side of the first switching element, and configured to further compensate the power supply to the LED signal by forming a bypass line of the temperature compensator when the first switching element is turned on. Disclosed is an LED signal lamp power supply device having a brightness control function during dimming control, including:

Preferably, the load control unit, the pulse converter for converting the voltage rectified by the rectifier into a square wave; When the discharge time of the square wave is detected and the discharge time is equal to or greater than the reference value, it is determined to be a dimming control signal, and the first control signal is output. When the discharge time is equal to or less than the reference value, the control signal is determined to be a normal lighting signal. A waveform detector; And a first switching element connected between the waveform detector and the dummy load, the first switching element being turned on / off according to the first or second control signal in series with the dummy load, and the first control signal being input. And a control switch unit which is turned on to allow a current to flow in the dummy load and is turned off when the second control signal is input to block current from flowing into the dummy load.

Preferably, the light output control unit has a second switching element connected in parallel with at least one resistor provided in the temperature compensating unit, and at the output side of the first switching element when the first switching element is turned on. The second switching element to which the signal input terminal is connected may be turned on to form a bypass line through which power is supplied to the LED signal lamp without passing through the resistor.

The present invention, by automatically controlling the power consumed by the temperature compensator in the power supply device to bypass output at the time of night light control of the light dimming control, thereby optimizing the brightness of the signal light during the dimming control to an appropriate level with improved visibility. There is an advantage that it can.

In particular, in such a control circuit configuration, by using the existing temperature compensation unit and the dummy load-related circuit configuration, there is an advantage to provide improved brightness conditions without significantly changing the existing circuit configuration.

1 is an example of an overall system block diagram of a typical traffic signal,
2 is an example of a signal transmission conceptual diagram of a conventional signal driver;
3 is a block diagram of an LED traffic light power supply device according to an embodiment of the present invention;
4 is a detailed circuit diagram of the LED traffic light power supply device according to an embodiment of the present invention,
5 is an operation flowchart of the LED traffic light power supply according to an embodiment of the present invention.

The present invention can be embodied in many other forms without departing from the spirit or main features thereof. Accordingly, the embodiments of the present invention are to be considered in all respects as merely illustrative and not restrictive.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, the terms "comprises", "having", "having", and the like are intended to specify the presence of stated features, integers, steps, operations, components, Steps, operations, elements, components, or combinations of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like or corresponding elements are denoted by the same reference numerals, and a duplicate description thereof will be omitted. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

3 is a block diagram of the LED traffic light power supply according to an embodiment of the present invention, Figure 4 is a detailed circuit diagram of the LED traffic light power supply according to an embodiment of the present invention. In the following description, a detailed description of the same configuration as in the prior art will be omitted.

The LED traffic light power supply device 20 of the present embodiment receives AC or DC power from the traffic signal controller 10 and supplies a DC signal for normal lighting or dimming control lighting to the LED traffic light 30.

In the case of receiving AC power, a full sine wave type radio wave signal may be received from the traffic signal controller 10, or a positive or negative half wave signal corresponding to a dimming control signal may be received. In order to reduce power during dimming control, a half-wave signal by alternating control of the traffic signal controller 10 may be input. The alternating control divides the plurality of LED traffic light power supply devices 20 connected to the traffic signal controller 10 into an odd number or even numbered number. +) Supplying the dimming control power by the half wave, and when (-) half-wave signal means the dimming control power by the (-) half wave to the even-numbered LED traffic light power supply device (20). This alternating control technique has also been proposed by the present inventors.

The LED traffic light power supply 20 includes a rectifier 100, a voltage detector 200, a constant voltage maintainer 300, a temperature compensator 400, a load controller 500 and a dummy load 600, a light It is configured to include an output control unit 700.

The rectifier 100 is a portion to which the driving power from the traffic signal controller 10 is input and is located at the tip of the LED traffic light power supply.

The rectifier 100 rectifies and outputs the voltage input from the traffic signal controller 10 when the voltage is an AC voltage, and outputs the rectified voltage when it is a DC voltage.

The voltage detecting unit 200 detects the voltage rectified by the rectifying unit 100 when the detected voltage is not a normal voltage (leak current occurs due to line aging and poor construction, a weak current for detecting whether a traffic light controller is opened or closed). Etc.) cuts off the voltage supply to the LED traffic light 30.

The constant voltage maintaining unit 300 maintains the voltage rectified by the rectifying unit 100 at an appropriate voltage.

The temperature compensator 400 includes one or more resistors R4, R5 and R6 and thermistors TH2 and TH3, and compensates for the DC power supplied to the LED signal lamp 30 by controlling the resistance value according to the temperature change. Function to perform

The temperature compensator 400 controls the output voltage (current) by relatively compensating for the current change characteristic of the LED due to the temperature change. The temperature compensator of the present exemplary embodiment may be configured such that, for example, a plurality of temperature compensating element units (R5 + TH2 or R6 + TH3) in which one resistor and a thermistor are connected in parallel are connected in series. R4) is further linked. For example, when the thermistor is configured with a negative temperature coefficient (NTC), the thermistor connected in parallel with the resistor lowers its resistance as the temperature increases, thereby lowering the parallel synthesis resistance. In addition, when the temperature decreases, the self-resistance value increases, but the parallel composite resistance value does not become larger than the intrinsic resistance value of the resistance. Therefore, the temperature compensator 400 compensates the LED luminous intensity by increasing the output voltage (current) by decreasing the parallel synthesis resistance value at a high temperature in order to compensate for the characteristics of the LED whose brightness is lowered as the temperature increases. do.

One end of the dummy load 600 is connected to the output terminal of the rectifier 100, and the other end thereof is connected to the output terminal of the control switch unit 570 of the load controller 500.

The load control unit 500 is electrically connected to the rectifying unit 100 and the dummy load 600, and includes a first switching element Q21 connected in series with the dummy load 600, so that the rectifying unit 100 includes the first switching element Q21. When the waveform of the rectified voltage is analyzed and the waveform is a radio signal which is a normal lighting signal, the first switching element Q21 is turned off to prevent current from flowing in the dummy load 600, and the waveform is controlled by dimming. In the case of a half wave signal, which is a signal, the first switching element Q21 is turned on to control the current to flow in the dummy load 600.

In more detail, the load controller 500 includes an auxiliary power supply 510, a pulse converter 530, a waveform detector 550, and a control switch 570.

The auxiliary power supply 510 drops the voltage rectified by the rectifier 100, converts the voltage into a constant voltage, and supplies DC power to the load controller 500. To this end, the auxiliary power supply 510 includes a resistor for voltage drop and a zener diode and a capacitor connected in series with the resistor to maintain a predetermined set voltage.

The pulse converter 530 converts the voltage rectified by the rectifier 100 into a square wave after dropping the voltage through a resistor.

The waveform detector 550 detects the discharge time (off time) of the square wave converted by the pulse converter 530, and when the discharge time is equal to or greater than a reference value, determines that it is a dimming control signal and outputs a first control signal. When the time is less than or equal to the reference value, it is determined that the normal lighting signal and outputs the second control signal.

For example, the waveform detector 550 may combine the diodes D3 and D4 with the resistor and the capacitor C3 to form a charge / discharge circuit, and the square wave applied from the pulse converter 530 is a normal lighting signal (propagation signal). In this case, the interval between pulses (pause period) is short, so that the discharge time is shortened and the HIGH signal (second control signal) is outputted, and when the square wave is the dimming control signal (half wave signal), the interval between pulses (pause period) ) Is long and a LOW signal (first control signal) is output.

The control switch unit 570 is connected between the waveform detector 550 and the dummy load 600, the first switching element (Q21) that is turned on / off according to the first or second control signal is the Is connected in series with the dummy load 600, when the first control signal (LOW signal) is input is turned on so that the current flows to the dummy load 600 and the second control signal (HIGH signal) is input It is turned off to block the current does not flow in the dummy load 600. As the switching element, for example, a known transistor element can be used.

In the circuit of FIG. 4, the connection point of the dummy load 600 may be connected to another point in addition to the illustrated point as long as desired power consumption may be achieved when the dimming control signal is input.

By the operation of the dummy load 600, by setting the power consumption during the dimming control operation to a desired value, the minimum power consumption conditions for the detection of contradictions required by traffic light-related standards (eg, the National Police Agency traffic signal controller standard standard) (E.g. 5W or more). Since the description of this part has been described in detail in the above-described prior art of the present inventors, further description will be omitted.

The light output controller 700 has a signal input terminal connected to an output side of the first switching element Q21, and forms a bypass line of the temperature compensator 400 when the first switching element Q21 is turned on. By further compensating for the power supply to the LED signal lamp 30, the brightness of the dimming control is further improved.

In more detail, the light output controller 700 includes a second switching element Q4 connected in parallel with at least one resistor R4 included in the temperature compensator 400, and the first switching element At the turn-on of Q21, the second switching element Q4 having a signal input terminal connected to the output side of the first switching element Q21 is turned on so that power is supplied to the LED signal lamp 30 without passing through the resistor. And to form a bypass line.

In the example of FIG. 4, if the second switching element Q4 is connected in parallel with one resistor R4, and if the bypass line can be formed, the second switching element Q4 is connected in parallel with the resistor and thermistor. One or more temperature compensation element units (R5 + TH2 or R6 + TH3) may be connected in parallel.

5 is an operation flowchart of the LED traffic light power supply according to an embodiment of the present invention.

External power for turning on the LED traffic light from the traffic signal controller is applied to the rectifier (S100). The power applied from the traffic signal controller includes an abnormal voltage such as a detection signal for detecting a leakage current or a traffic light operation state, a normal lighting signal which is a normal LED driving voltage, and a dimming control lighting signal at night. These applied power sources may be full-sinusoidal propagated or half-wave signals, their rectified form, or the like.

If the external power supply is a DC voltage, the rectifying unit is passed as it is, and if the external power supply is an AC voltage, it is rectified to a DC voltage (S200).

The voltage detector detects the magnitude of the rectified voltage, cuts off the power supply to the LED signal when the detected rectified voltage is not the normal voltage, and detects the waveform of the rectified voltage when the detected external voltage is the normal voltage. (S300). The step S300 includes converting the rectified voltage into a square wave form in the pulse converter and detecting the waveform in the waveform detector.

If the detected waveform is a half-wave signal, the first switching element of the control switch unit is turned on, and thus, one end of the dummy load is connected to ground to provide a path for current so that the dummy load operates as a load consuming power ( S400). If the detected waveform is a radio wave signal, the control switch unit is turned off and thus the current path of the dummy load is blocked, thereby eliminating the power consumption of the dummy load.

In addition, at the same time as the step S400, the second switching element of the optical output control unit connected to the output side of the first switching element of the control switch unit is also turned on, the bypass line of the temperature compensation unit is formed, the current output to the signal lamp side Is flowed to the LED signal light side without passing through the temperature compensation unit (S500).

After that, a constant voltage is output to the LED signal lamp and the LED is turned on in the dimming control mode (S600). At this time, the brightness of the LED is provided as an improved brightness compared to the case where the conventional bypass is not achieved.

10: traffic signal controller 20: LED traffic light power supply device
30: LED traffic light 100: rectifier
200: voltage detector 300: constant voltage holding unit
400: temperature compensation unit 500: load control unit
510: auxiliary power supply unit 530: pulse conversion unit
550: waveform detection unit 570: control switch unit
600: dummy load 700: light output control unit

Claims (3)

An LED signal power supply that receives AC or DC power from a traffic signal controller and supplies DC power for normal lighting or dimming control lighting with an LED signal lamp. The AC power source is a sine wave type radio signal or is controlled by alternating control. Any of the positive or negative half-wave signals corresponding to the control signal
If the voltage input from the traffic signal controller is an AC voltage rectifying and outputting, if the DC voltage rectifying unit for outputting it as it;
A voltage detector for detecting a voltage output from the rectifier and blocking supply of voltage to the LED signal when the detected voltage is not a normal voltage;
A constant voltage holding unit configured to maintain the voltage rectified by the rectifying unit at an appropriate voltage;
A temperature compensator having a resistor and a thermistor and performing compensation of a DC power supplied to the LED signal lamp by controlling a resistance value according to a temperature change;
A dummy load connected to a rear end of the rectifier; And
A first switching element electrically connected to the rectifying unit and the dummy load and connected in series with the dummy load, and analyzing the waveform of the voltage rectified by the rectifying unit to analyze the waveform of the voltage; A load control unit which turns off a first switching element to prevent current from flowing in the dummy load and controls the current to flow in the dummy load by turning on the first switching element when the waveform is a half wave signal that is a dimming control signal; And
A light output controller connected to an output side of the first switching element, and configured to form a bypass line of the temperature compensating unit when the first switching element is turned on to further compensate power supply to an LED signal lamp; Configured to include,
The load control unit includes:
A pulse converter converting the voltage rectified by the rectifier into a square wave;
When the discharge time of the square wave is detected and the discharge time is equal to or greater than the reference value, it is determined to be a dimming control signal, and the first control signal is output. When the discharge time is equal to or less than the reference value, the control signal is determined to be a normal lighting signal. A waveform detector; And
The first switching element connected between the waveform detection unit and the dummy load and turned on / off according to the first or second control signal is connected in series with the dummy load so that the first control signal is input. And a control switch unit which is turned on to cause a current to flow in the dummy load, and is turned off when the second control signal is input to block current from flowing into the dummy load.
The light output control unit,
A second switching element having a second switching element connected in parallel with at least one resistor provided in the temperature compensating unit, and having a signal input terminal connected to an output side of the first switching element when the first switching element is turned on; Is turned on to form a bypass line through which the power is supplied to the LED signal lamp without passing through the resistor. delete delete

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