Door control e-dog demodulation system based on active filter circuit
A filter circuit and electronic dog technology, applied in the direction of electromagnetic audible signals, can solve problems such as false start, achieve fast response, ensure stability, and strong practicability
Inactive Publication Date: 2018-04-06
四川新驱科为科技有限公司
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AI Technical Summary
Problems solved by technology
However, the existing access control electronic dog uses an infrared control system to control the opening and closing of the access control electronic dog. This control system has the problem of being prone to false start, which leads to the failure of the access control electronic dog to play a good role in welcoming guests. Thereby existing access control electronic dog can not satisfy people's demand
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[0020] Such as figure 1 As shown, the invention discloses a detection system for an electronic dog for access control based on an active filter circuit, which includes an ultrasonic transmitting circuit and an ultrasonic receiving circuit connected with the ultrasonic transmitting circuit.
[0021] Wherein, the ultrasonic transmitting circuit such as figure 1 As shown, it includes an ultrasonic sensor LS1, an active filter circuit connected to the ultrasonic sensor LS1, a preamplifier circuit connected to the active filter circuit, and a time-base oscillator circuit connected to the preamplifier circuit. At the same time, the ultrasonic receiving circuit includes an ultrasonic receiver LS2 connected to the ultrasonic sensor LS1 through a wireless network, an integrated operational amplifier circuit connected to the ultrasonic receiver LS2, a detection circuit connected to the integrated operational amplifier circuit, and a detection circuit connected to the ultrasonic receiver...
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The invention discloses a detection system for an electronic dog for access control based on an active filter circuit, which is characterized in that it comprises an ultrasonic transmitting circuit and an ultrasonic receiving circuit connected with the ultrasonic transmitting circuit. The present invention is simple in structure and strong in practicability. The system generates a reference oscillation frequency through a time-base oscillation circuit, and the oscillation frequency exists between the ultrasonic sensor LS1 and the ultrasonic receiver LS2. Increase the level of the oscillation frequency, so that the detection system outputs a high level to drive the access control electronic dog to open; at the same time, the set active filter circuit can actively control the magnitude, frequency and phase of the output signal current, and respond quickly to offset the load in the load. Corresponding to the current interference signal, the dynamic tracking compensation is realized, thus ensuring that the electronic dog is not turned on by mistake.
Description
technical field [0001] The invention relates to a detection system, in particular to a detection system for an electronic dog for access control based on an active filter circuit. Background technique [0002] With the continuous development of science and technology, more and more electronic products have entered people's lives. Among them, the access control electronic dog is favored by people because it can be used as a guard or welcome. At present, most supermarkets and other stores use access control electronic dogs as welcome guests. This kind of access control electronic dogs used for welcoming guests in stores realizes the welcome function through ultrasonic detection systems. However, the existing access control electronic dog uses an infrared control system to control the opening and closing of the access control electronic dog. This control system has the problem of being prone to false start, which leads to the failure of the access control electronic dog to play...
Claims
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Login to View More IPC IPC(8): G08B3/10
CPCG08B3/10
Inventor 王前明
Owner 四川新驱科为科技有限公司