As you are undoubtedly aware, LED vehicle traffic signals do require electricity in order to control traffic flow and enhance road efficiency. Low-voltage and high-voltage are the two primary forms of electricity, though. So, do high-voltage or low-voltage electricity sources power traffic lights? Qixiang will elucidate.
LED vehicle traffic signals are driven by high-voltage electricity and controlled by low-voltage electricity.
Low-voltage electricity:
Low-voltage electricity is used as a signal current, generally referring to DC circuits or audio, video, network, and telephone lines. DC voltage is generally below 36V.
High-voltage electricity:
High-voltage electricity is used as a power source, generally referring to the electrical components in the electrical engineering field. It is characterized by high power, high current, and low frequency, with AC voltage generally above 24V.
Any electrical equipment using AC power falls under the category of high-voltage electricity; therefore, LED vehicle traffic signals are no exception.
The high-voltage and low-voltage electricity used in LED vehicle traffic signals do not simply refer to the voltage or current of the power supply, but rather to the entire system. For example, lighting, air conditioning, and power systems all fall under the category of high-voltage electricity, while fire protection, security, and building intelligent systems fall under the category of low-voltage electricity.
Working principle of a road traffic signal control system:
To complete the entire process of road traffic signal control, a main controller, control circuit, counter, timer, decoder, clock signal generator, signal light decoding and driving circuit, and digital display decoding and driving circuit are required.
The second pulse generator is the standard clock signal source for the timer and controller in this system; the decoder outputs control signals for two sets of signal lights, which drive the signal lights after passing through the driving circuit; the controller is the main part of the system, controlling the operation of the timer and decoder.
Then, the clock signal generator transmits the signal to the main control circuit and counter, the counter transmits it to the decoder, and finally the display shows the result, informing the backend of the specific situation before sending it back to the main control circuit. The decoder then transmits the signal to the road traffic lights, displaying it on the main and secondary road traffic lights respectively.
LED vehicle traffic signal control methods are as follows:
1. Adaptive Control:
To create a comprehensive timing scheme, adaptive control of traffic lights takes into account variables like traffic flow, number of stops, delay time, and queue length. No matter how traffic conditions change, this approach maintains optimal control.
2. Sensor-Based Control:
Installing vehicle detectors at intersections is the main component of sensor-based control. These detectors calculate the traffic light timing scheme based on the number of vehicles passing through, using a computer or intelligent controller. Based on data from vehicle sensors, the cycle length and green light duration can be changed, improving intersection capacity, lowering delays, and better responding to variations in traffic volume.
3. Timed Control:
A more conventional approach is timed control. A predetermined timing scheme is followed by the traffic signal controller. Periodic control is a common term for this. Timed periodic control is a type of automatic control; various combinations of timing parameters constitute different signal timing schemes. A single-segment timing control system uses only one timing scheme per day; a multi-segment timing control system uses multiple timing schemes per day.
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Post time: Mar-11-2026
