Electronic fence manufacturers _ _ electronic fence system pulse ALEPH electronic fence

Electronic fence electronic fence _ _ how much of a electronic fence ALEPH ALEPH offered by electronic technology. Electronic fence, ALEPH electronic fence, electronic fence factory in Guangzhou City Councilor Li Fu Electronic Technology Co., Ltd. (www.alephchina.com) 2014 has been newly upgraded electronic fence system pulse launched mainly by the high-voltage pulse generating circuit, and alarm, The main controller 3 major components. Typically, the electronic fence bare wire outside, along the existing fence installation. Traditional infrared radio alarm system may produce false positives, as long as there are people or things through, it will alarm occurs, therefore, not the newspaper also reported. The new pulse electronic fence system can distinguish between accidental touching and forcible invasion of the function, if someone accidentally touches a fence or other objects (such as tree branches) instant hit and the fence, because this is not a real invasion, the system does not have the ability to identify Call the police. Only when the intruder invasion force, the electronic fence to climb even malicious cut bare wire fence, causing the system break (open) or continuous touch line (short circuit), will be issued a warning. In order to prevent high-voltage electronic pulses bare wire fence on the interference of single-chip control system, taking into account measures to isolate the high-pressure, to avoid their entering into the main parts: First, between the main chip and the output port using optical coupling isolation , optical coupling isolation circuit so there is no direct connection between the two parts of the electrical circuit isolation is to prevent interference due to electrical connections caused. Second, the design of high-voltage pulse snubber circuit with varistors absorb the pressure, so that the high-voltage pulse can not enter the low voltage control section. The most important feature of the varistor is added on top of it when voltage is below its threshold "UN" when little current flowing through it, the equivalent of a shut valve, when the voltage exceeds the UN, flowing its current surge, the equivalent of the valve opens, varistors called electric shocks (surge) absorber, namely high-voltage pulse snubber circuit. In this design model is adopted 22Z2 varistors. Guangzhou Yi Li Fu Electronic Technology Co., Ltd. was established in 2003, mainly engaged in anti-theft alarm system installation and related product sales, technical advice and other services; companies adhering to the "integrity, truth-seeking, innovative, progressive" business philosophy, over the years area of ??Guangzhou, Beijing, Zhejiang, Jiangsu and enjoy a broad customer base, Projects across all sectors; and with a sound service system has won wide acclaim and industry. Intelligent high-voltage pulse detector pulse detecting unit hardware design: the use of infrared transmission and reception manner that effectively isolate the high voltage pulse is physically connected to the computer. Power supply voltage detection and voltage feedback circuit: The circuit mainly detect power voltage is converted through LPC2131A / D conversion port, with a given value, the feedback control pulse sequence OUT1 achieve a stable output. Tamper alarm system: the reflection type infrared detection mode, the controller output 20ms pulse period, the system detects the received pulse, such as the case of the chassis is opened, the received pulse disappears, the system alarm. Watchdog System: Since the electronic fence set up in the outdoors, a lot of outside interference, to system stability, the system uses a dedicated reset chip CAT1023, the chip has a hardware reset functions, including 1.6 S watchdog timer circuit, in When the system due to software or hardware interference is terminated or "hang" the system is reset to the initial state. System communication: According to the system requirements, the system uses a dedicated chip as RS485 communication interface standard application LPC2131 UART0 query mouth half-duplex communication with the host machine, and the receiving PC control commands. Photoelectric alarms: system design panel LED display and alarm siren and through RS485 communication port were uploaded to the machine.