Induced voltage suppressor for use in a traffic signal controller

A technology of induced voltage and traffic signal, applied in the field of induced voltage suppressor

Active Publication Date: 2010-03-10
ALDRIDGE TRAFFIC CONTROLLERS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the great drawback of this approach is that the resistor will get undesirably hotter during normal use because, as long as the light is on, the resistor has the full supply voltage applied to it

Method used

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  • Induced voltage suppressor for use in a traffic signal controller

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Embodiment Construction

[0015] Working in a traffic signal controller is an inductive voltage suppressor, which is placed along the lamp drive circuit. An inductive voltage suppressor consists of: a conventional traffic light load switch, typically a triac; a load resistor whose impedance is low enough to reduce the inductive voltage to low levels; and an additional low power switch , to allow the load resistor to be disconnected from the circuit when the main traffic light load switch is operating. In this embodiment, the load resistor has a high positive temperature coefficient of resistance, so that if the full supply voltage is applied to the load resistor due to some wiring fault or control error, the natural heating of the load resistor will make it The resistance increases, limiting further heating. Such resistors are commonly available commercially and are known as PTC thermistors.

[0016] The connection of the load resistor to the output of the traffic light load switch occurs automatical...

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Abstract

An induced voltage suppression device for use in a traffic signal controller is located along a lamp drive circuit (24) of a traffic light. The device includes a low impedance element (16) and an independently controllable switching element (12) able to disconnect the low impedance element from the circuit at any time.

Description

technical field [0001] The invention relates to an induced voltage suppressor for a traffic signal controller. In particular, the present invention relates to an apparatus and method for switching the output of a traffic signal controller to prevent the voltage on the wires leading to the controller from undesirably affecting nearby LED traffic lights operated by the controller The voltage of the supply line that supplies the power. Background technique [0002] In the field of electronic road traffic control systems it is useful to be able to determine whether a traffic light is on or not by measuring the voltage on the wires supplying power to the traffic light. Unfortunately, when all light bulbs or lighting fixtures are powered by open wires, voltage measurements cannot definitively show that the lights are being powered. This occurs because the voltage on an open wire is affected by nearby wires. An undesired voltage on the supply line will not normally affect lamp o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08G1/07H04L1/00
CPCG08G1/07
Inventor 马尔科姆·扬
Owner ALDRIDGE TRAFFIC CONTROLLERS
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