Light-emitting diode (LED) unit and constant-current unit voltage-stabilizing light-emitting diode (LED) traffic signal lamp

Abstract

The invention provides a light-emitting diode (LED) unit. In the LED unit, the light-emitting diode is connected in parallel with at least one diode of which the forward voltage drop is close to the working voltage of the light-emitting diode; and based on the principle of stabilizing the voltage with the forward voltage drop of the positive-negative (PN) junction of the diode, the working voltage of the light-emitting diode is stabilized. The invention also provides a constant-current unit voltage-stabilizing light-emitting diode (LED) traffic signal lamp. The traffic signal lamp comprises a current-rectifying bridge and at least one branch circuit which is formed by connecting the serially-connected LED unit and a constant-current control module in series. The voltage drop is realized by a constant-current unit voltage-stabilizing circuit and the voltage reducing power of the unit is very small, so that the whole control system does not use any power assembly and any heating element and the circuit can work stably and reliably.

Description

technical field [0001] The invention relates to an LED unit and a constant-current unit voltage-stabilized LED traffic signal lamp comprising a plurality of LED units. Background technique [0002] The abbreviation of light-emitting diode is LED, which is the abbreviation of English Light Emitting Diode. It is a diode made of compounds of gallium (Ga), arsenic (AS), and phosphorus (P), that is, on the PN junction, between holes and electrons. When jumping, most of the energy is emitted in the form of light. The color of the light depends on the manufacturing material of the light-emitting diode, and there are many colors such as red, yellow, and green. [0003] With the development of my country's transportation industry, various types of traffic signal LED display devices have been used in large quantities. It has replaced the traditional incandescent traffic signal lights and achieved the green goals of energy saving and environmental protection. At the same time, low co...

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Problems solved by technology

[0005] The present invention provides an LED unit and a constant-current unit voltage-stabilized LED traffic signal lamp comprising a plurality of LED units, which solves the error judgment of the controller detection circuit caused by the excessive starting current of the switching power supply of the signal lamp in the prior art, which is prone to failure. Under the condition of the same brightness, it realizes low power and high brightness, and the circuit works stably and reliably

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