CN2257782Y - An electronic anti-theft alarm for bicycles - Google Patents

Abstract

The electronic anti-theft alarm for bicycle consists of emitter and receiver, the emitter may be installed inside the seat cushion and the receiver may be carried by the user. The receiver comprises an antenna, a high-frequency amplifier, a detector, an operational amplifier, a decoder, an audio oscillator, a buzzer and the like; the transmitter being formed by a piezoelectric sensor P₁The device comprises an operational amplifier, an encoder, a single-channel transmitting circuit, a resistor, a capacitor, a charging and discharging circuit, an antenna and the like. The device can prevent the vehicle from making an alarm sound, so as to adapt to the requirement of timely reminding the vehicle owner that the vehicle is stolen and the alarm is not easy to be found by the thief.

Description

An electronic anti-theft alarm for bicycles

The utility model relates to an electronic anti-theft alarm for bicycles.

At present, with the advancement of material technology, bicycles and other two-wheeled light vehicles have become lighter and lighter, and there are more and more high-end vehicles. Therefore, in public places, the phenomenon of bicycles being damaged or even stolen by others is increasing day by day , Bring bothering brain and inconvenience to bicycle owner. Occurred on the market to store multiple anti-theft alarm devices for bicycles thus, its shortcoming is that alarm device is generally installed in one with bicycle, when the thief moves bicycle, sends sound alarm, also reminds the thief while reporting to the police.

The purpose of the utility model is to provide an electronic anti-theft alarm for bicycles which utilizes a transmitting and receiving device to complete an alarm, and the vehicle itself does not emit any sound.

The utility model is composed of a transmitter and a receiver. Both the transmitter and the receiver are powered by batteries, the transmitter is placed in the bicycle seat, and the receiver is carried with you. Wherein the transmitter is powered on immediately when the bicycle lock is locked, and maintains air wave contact with the receiver. When the vehicle is damaged or moved by others, it will immediately send out an alarm signal suitable for the individual due to the induced vibration, so as to The radio signal is only received by that individual's receiver. The transmitter is composed of a piezoelectric sensor P ₁ , an operational amplifier U ₁ , an encoder U ₂ , a single-channel transmitting circuit Rf, a resistor, a capacitor charging and discharging circuit R/C, an antenna and a power supply BT. The piezoelectric sensor is composed of a piezoelectric element _X1 , the piezoelectric element _X1 is fixed with a spring _X1 , the output terminal of the piezoelectric sensor _P1 is connected to the input terminal of the operational amplifier _U1 , and the output of the operational amplifier _U1 The end is connected to the trigger end of the encoder _U2 , and the output end of the bias coder _U2 is connected to the transmitting antenna Rf; the first end of the charging and discharging circuit R/C is connected to the positive end of the power supply through the power switch SW, and the second end is connected to the negative end of the power supply. Terminal 3 is connected to input terminal 2 of U _1B in the operational amplifier. The receiver is composed of receiving antenna, high-frequency amplifier Rf, detector _D1 , operational amplifier _U3 , decoder _U4 , audio oscillator OSC, buzzer or speaker SPK, power supply BT and switch SW; The input terminal of the amplifier Rf is connected to the antenna, the output terminal is connected to the input terminal of the detector _D1 , the output terminal of the detector _D1 is connected to the input terminal of the operational amplifier _U3 , the output terminal of _U3 is connected to the input terminal of the decoder _U4 , and the decoding The output terminal of the device _U4 is connected to the input terminal of the audio oscillator OSC, the output terminal of the audio oscillator OSC is connected to the buzzer or the speaker SPK, and the switch SW is connected in series to the power supply BT circuit.

When the vibrator composed of piezoelectric sensors is moved or vibrated, a signal will be generated in time, and the signal will be amplified by an amplifier U ₁ first to trigger the encoder U ₂ to send a preset frequency, and finally, the dynamic rate Amplified and transmitted through the antenna. After the receiver receives the signal from the transmitter through the antenna, it is first amplified by the high-frequency amplifier Rf, then filtered by a detector _D1 , amplified by the amplifier _U3 , and finally, the audio oscillator OSC is controlled by the decoder _U4 , so that The buzzer or horn SPK will sound the alarm.

The transmitter of the utility model is installed in the seat cushion of the car, and the receiver is carried around, so that the vehicle itself does not emit any sound, so as to meet the needs of reminding the owner of the stolen vehicle in time without making the thief discover the need to call the police.

Graphic description:

Fig. 1 is the transmitter circuit diagram of the present utility model.

Fig. 2 is a circuit diagram of the receiver of the present invention.

Concrete structure and working principle of the present utility model are shown in accompanying drawing. In Figure ₁ , P1 is a piezoelectric sensor, _X1 is a piezoelectric element, SP is a spring, and the spring is fixed on _X1 , _U1 is an operational amplifier, _U2 is an encoder, and Rf is a single-channel transmitting circuit. Transistors and other components form a high-frequency oscillation circuit, and the oscillation frequency can be adjusted. R/C is a resistor and capacitor charging and discharging circuit, BT is a power supply, and SW is a power switch. The SW power switch can be operated by hand or driven by locking the lock head. When the power is turned on, the transmitter immediately enters the alert state. In the static state, X ₁ does not generate voltage so that the output pin 1 of U ₁ is at zero potential, and U ₂ There is no output, Rf does not oscillate, so no signal is emitted. When the bicycle is moved or subjected to vibration, the spring also vibrates and x ₁ , a weak voltage is generated due to being squeezed, which is amplified by U _1A , and the size of the amplified voltage can be adjusted by R ₁ , that is to adjust the vibration sensitivity, pin 7 amplifies the voltage and sends it to pin 3, when the potential is higher than pin 2, pin 1 immediately rises from zero potential to high potential, and feeds back to pin 3 through fb to keep pin 1 high Potential, U ₂ outputs codes to Rf to trigger the oscillator and modulate to transmit at the same time. The length of the launch time is determined by the R/C charging time. The coding pins 1-8 of U ₂ are connected to positive or negative potentials or suspended to form different code, but the code must be the same code as the receiver, and _P1 can also be replaced by an infrared sensor. In Figure 2, Rf is a high-frequency amplifier, which is composed of transistors and other components, _D1 is a detector and is also composed of transistors and other components, _U3 is an operational amplifier, _U4 is a decoder, OSC is an audio oscillator, SPK is the buzzer or horn, BT is the power supply, and SW is the switch. When the power supply SW is turned on, the receiver enters the state of waiting to receive signals. When the antenna receives the transmitted signal, it is amplified by Rf, and the required signal is detected by the detector _D1 . Because the signal is weak, it is transmitted by the A and A of the operational amplifier _U3 . B secondary amplification, output from pin 7 to U ₂ for decoding, when the same code is transmitted and received, U ₂ outputs a high potential to trigger the OSC audio oscillator to drive the SPK buzzer or horn to sound an alarm.

Claims (1)

1. A kind of bicycle electronic anti-theft siren horn is characterized in that:

   It is made up of transmitter and receiver two parts; Emitter can place in the bicycle seat, and receiver is for carrying; Described emitter is by piezoelectricity perceptron P ₁, op amp U ₁, coder U ₂, single channel transmission circuit Rf, resistance, capacitor charging discharging circuit R/C, antenna and power supply BT form; Described piezoelectricity perceptron is by piezoelectric element X ₁Form piezoelectricity perceptron P ₁Output termination op amp U ₁Input end, op amp U ₁Output termination coder U ₂Trigger end, coder U ₂The mouth sending and receiving penetrate antenna Rf; 1 end of described charge and discharge road R/C is by source switch SW power connection anode, 2 termination power negative terminals, U in the 3 termination op amps _1BInput end 2; Described receiver is by receiving wire, radioamplifier Rf, detecter D ₁, op amp U ₃, demoder U ₄, audio frequency oscillator OSC, buzzer phone or loudspeaker SPK, power supply BT and switch SW form; Wherein the input termination antenna of radioamplifier Rf is exported termination detecter D ₁Input end, detecter D ₁Output termination op amp U ₃Input end, U ₃Output termination demoder U ₄Input end, demoder U ₄The input end of output termination audio frequency oscillator OSC, audio frequency oscillator OSC output termination buzzer phone or loudspeaker SPK, switch SW is serially connected in the power supply BT loop.

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