A multi-channel signal light state detector based on cpld or fpga

Abstract

The invention relates to electronic police system, in particular to a multi-channel signal lamp state detector based on a CPLD or a FPGA in the electronic police system. The multi-channel signal lamp state detector based on the CPLD or the FPGA comprises a clock circuit connected with a CPLD processing system or a FPGA processing system, and a front end circuit connected with traffic signal lamps of a plurality of channels, the front end circuit outputs a signal after processing each signal input to the signal lamps, each output signal is input the CPLD processing system or the FPGA processing system, the CPLD processing system or the FPGA processing system correspondingly outputs an I / O signal of each channel after processing each input signal, and data are output. According to the multi-channel signal lamp state detector based on the CPLD or the FPGA in the electronic police system, a single chip microcomputer processing way in the prior art is completely abandoned, one piece of CPLD or FPGA is adopted for performing core processing, and not only are the properties that the plurality of channels are completely independent, work parallelly, and have no performance bottleneck, and the system has no crash problem and can steadily work for a long time achieved, but also a digital technology is adopted for each channel to filter interference signals, detection accuracy is guaranteed, and a missing shooting or mistaking shooting phenomenon can not happen to the electronic police system.

Description

technical field [0001] The invention relates to an electronic police system, in particular to a signal lamp state detector in the electronic police system. Background technique [0002] In the electronic police system, traffic violations are generally judged by the status of traffic lights. A signal light status detector is an electronic device used to obtain the status of a signal light. Signal light status detector, that is, to detect the on-off condition of the signal light, and output the detection result in the form of I / O signal or serial port protocol. The existing signal light state detector is mainly composed of three parts: front-end circuit, protocol processing, and output interface. The front-end circuit converts the power signal from the signal lights in parallel into a level signal suitable for subsequent circuit processing; the protocol processing part converts the detected signal light state into high and low level I / O signals or serial port protocol data. ...

AI Technical Summary

Problems solved by technology

Due to the limitation of the performance of the single-chip microcomputer, when dealing with signal lights of multiple channels, it can only do simple signal light status detection and result reporting, and cannot effectively filter interference signals and flexibly realize other additional functions; in addition, the single-chip microcomputer itself is easily affected by interference, resulting in Even if the watchdog is used to solve the above problems, the detection of the signal light status will be missed during the period from system abnormality to watchdog reset, and then to the device restarting to work normally. There will be missed or wrong shots

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