Control apparatus for network traffic light
First Claim
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1. A control apparatus for a network traffic light comprising:
- a main control device, a plurality of lamp control devices each adapted to be connected with a plurality of lamps having on and off states, and a pair of power transmission lines connected between said lamp control devices and said main control device to permit them to communicate with each other;
said main control device includes;
first single-chip microprocessor capable of making control decisions for controlling the on and off states of said lamps and encoding and decoding a communication signal;
first power line carrier communication circuit coupled between said first microprocessor and said power transmission lines for receiving an output communication signal from said first microprocessor and then loading it onto said power transmission lines; and
for unloading an input communication signal from said power transmission lines and then inputting it into said first microprocessor;
a display device and key-in circuit coupled to said first microprocessor for displaying the operation states of said network traffic light and for inputting a set signal keyed in by a user into said microprocessor; and
a power line filter coupled to said power transmission lines to avoid power line harmonic interference; and
each lamp control device including;
second single-chip microprocessor capable of controlling the on and off states of said lamps, and encoding and decoding a communication signal;
second power line carrier communication circuit coupled between said second microprocessor and said power transmission lines for receiving an output communication signal from said second microprocessor and then loading it onto said power transmission lines; and
for unloading an input communication signal from said power transmission lines and then inputting it into said second microprocessor;
a plurality of solid-state relays coupled between said second microprocessor and said lamps respectively, and being actuated by said second microprocessor to turn on/off said lamps; and
a plurality of lamp fail detecting circuits coupled between said second microprocessor and said lamps respectively for detecting fail conditions of said lamps.
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Abstract
A control apparatus for a network traffic light is provided with a main control device, a lamp control device, and a pair of power transmission lines connected between the main control device and the lamp control device in a ring-shaped fashion to carry the control signals which control each lamp set at an intersection. In this way, the layout engineering is simplified, and thus its cost is reduced. The ring-shaped layout permits the network traffic light to sustain its operation even if some of its lines are broken during road works. Maintenance of the control apparatus is also easy and fast.
37 Citations
10 Claims
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1. A control apparatus for a network traffic light comprising:
- a main control device, a plurality of lamp control devices each adapted to be connected with a plurality of lamps having on and off states, and a pair of power transmission lines connected between said lamp control devices and said main control device to permit them to communicate with each other;
said main control device includes; first single-chip microprocessor capable of making control decisions for controlling the on and off states of said lamps and encoding and decoding a communication signal; first power line carrier communication circuit coupled between said first microprocessor and said power transmission lines for receiving an output communication signal from said first microprocessor and then loading it onto said power transmission lines; and
for unloading an input communication signal from said power transmission lines and then inputting it into said first microprocessor;a display device and key-in circuit coupled to said first microprocessor for displaying the operation states of said network traffic light and for inputting a set signal keyed in by a user into said microprocessor; and a power line filter coupled to said power transmission lines to avoid power line harmonic interference; and each lamp control device including; second single-chip microprocessor capable of controlling the on and off states of said lamps, and encoding and decoding a communication signal; second power line carrier communication circuit coupled between said second microprocessor and said power transmission lines for receiving an output communication signal from said second microprocessor and then loading it onto said power transmission lines; and
for unloading an input communication signal from said power transmission lines and then inputting it into said second microprocessor;a plurality of solid-state relays coupled between said second microprocessor and said lamps respectively, and being actuated by said second microprocessor to turn on/off said lamps; and a plurality of lamp fail detecting circuits coupled between said second microprocessor and said lamps respectively for detecting fail conditions of said lamps. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- a main control device, a plurality of lamp control devices each adapted to be connected with a plurality of lamps having on and off states, and a pair of power transmission lines connected between said lamp control devices and said main control device to permit them to communicate with each other;
Specification