In order to meet the requirements of people carrying the bag anti-theft when they go out, the bag with anti-theft alarm function came into being. However, the anti-theft bag with more complete functions is expensive, the structure is more complicated, and it is difficult to be accepted by people; while the anti-theft bag with simple function is cheap, but the practicality is poor, so that the bag with the anti-theft alarm function cannot be Get popularized.
The characteristic is: when someone moves the bag due to the position, or takes it down and put it down, the bag does not alarm and does not generate high voltage; if the bag is stolen by the thief, as long as it goes out a certain distance (that is, more than a certain time), the bag immediately Alarm, and generate high pressure on the handle, forcing the thief to drop the bag; in addition, when someone tries to open the bag zipper or lock without attempting to move the bag, the owner steals the valuables in the bag when he is not paying attention or sleeping. As long as the thief's hand touches the metal zipper or the lock on the nylon zipper or the lock on the bag, the anti-theft bag immediately alarms, and the relevant part generates high-voltage electricity, which makes the thief unable to start. With the above functions, the possibility that the bag is stolen or the contents of the bag are stolen will be reduced to a minimum.
Circuit working principle
The circuit diagram of the self-defense anti-theft bag is composed of a touch switch circuit, an audio sound circuit, a delay switch circuit and a high voltage generating circuit. Among them, the audio sound circuit and the high voltage generating circuit are common circuits of the anti-theft device.
The touch switch circuit is composed of an inductor M that receives the human body induced voltage and a combination switch tube BG1 and BG2. The BG3 and BG4 form a complementary audio circuit that emits an alarm sound similar to a steamboat.
The delay switch circuit is composed of a resistor R4, a capacitor C5 and a single junction transistor BG5. In fact, it is a delay relaxation oscillator.
The high voltage generating circuit is composed of three parts: oscillation, amplification and power amplifier. BG6 and BG7 form a free multivibrator, which generates an oscillation frequency of about 24 kHz. It is amplified by C8 and R12 into the base of BG8. After amplification, it is coupled to BG9 by transformer B1 for power amplifier. The base of the power amplifier tube BG9 is not DC biased, so the signal amplified by the BG9 is a pulse AC signal. The load of the power amplifier is the step-up transformer B2, and the boosted voltage is about 5000V.
When no one touches the sensor M, the base of the composite tube BG1 has no signal voltage, and BG1 and BG2 are turned off; when the human touches M (ie touches the metal zipper or lock), the induced voltage of the human body is added to BG1 through R1. The base pole makes the composite switch tube composed of BG1 and BG2 saturate and conduct. The potential of the BG2 emitter is close to the voltage of the power supply, and a voltage drop is generated on the resistor R1. The isolation diode D1 is forward-conducting, and the signal voltage is sent to the base of the BG3. The pole makes the complementary audio oscillator work and the speaker sounds an alarm. When the human hand leaves the sensor, the base of the BG1 tube loses the human body induced voltage, and the alarm is turned off again. In the normal state (ie, the state to be alarmed), the power switch K1 of the touch switch circuit and the complementary audio sounding circuit is placed in the on position. In order to synchronize the high voltage with the alarm after the K2 is turned on, the electric relay J and the unidirectional thyristor SCR constitute a high voltage power switch circuit. When the power switch K2 is turned on, the alarm can not immediately alarm, nor can it immediately generate high voltage. When the charging voltage on C5 reaches the trigger voltage of the emitter of the single junction transistor, the emitter E and the first base B1 are turned on. A voltage drop is generated on the resistor R7, and the signal voltage is sent to the base of the BG3 and the control pole of the SCR, respectively, so that the alarm sounds and the J action generates a high voltage. In this way, no matter whether the thief is trying to open the bag or pick up the bag, the anti-theft alarm device installed in the bag will perform reliable work according to people's needs.
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The network management switch product provides a variety of network management methods based on the terminal control port (Console), based on the Web page, and supports Telnet? Remote login to the network. Therefore, network administrators can perform local or remote real-time monitoring of the switch's working status and network running status, and manage the working status and working mode of all switch ports in a global view.
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