Anti-theft alarm circuit of electric vehicle

Abstract

The utility model discloses an anti-theft alarm circuit of an electric vehicle in the technical field of safety and theft prevention, which comprises a power supply circuit, the power supply circuit is respectively connected with a vibration anti-theft detection circuit and a power-off anti-theft detection circuit, and both the vibration anti-theft detection circuit and the power-off anti-theft detection circuit are connected with an alarm circuit. The power supply circuit supplies power to the vibration anti-theft circuit and the power-off anti-theft detection circuit, once someone steals the electric vehicle and the electric vehicle moves, the power-off anti-theft detection circuit sends out an alarm signal, the alarm circuit sends out an alarm sound, once a storage battery wire of the electric vehicle is cut off, the power-off anti-theft detection circuit sends out an alarm signal, and the alarm sound is sent out. And the alarm circuit gives out an alarm sound, so that the electric vehicle is subjected to dual protection and is prevented from being stolen.

Description

Technical Field

[0001] This utility model relates to an electric vehicle anti-theft alarm circuit in the field of security and anti-theft technology. Background Technology

[0002] Electric bicycles, also known as "electric bikes," are purely electric vehicles powered by batteries and driven by electric motors. In recent years, they have become very popular in my country. Electric bicycles have gradually replaced traditional bicycles as a primary mode of public transportation, leading to a surge in electric bicycle thefts. Although electric bicycles are equipped with alarms that sound when the bike is locked and being moved, the alarm stops working once the thief cuts the battery cable, still resulting in losses. Utility Model Content

[0003] The purpose of this invention is to provide an anti-theft alarm circuit for electric vehicles, which will still sound an alarm even if the battery cable of the electric vehicle is cut, thereby playing an anti-theft role.

[0004] To achieve the above objectives, this utility model provides an electric vehicle anti-theft alarm circuit, including a power supply circuit, which is connected to a vibration anti-theft detection circuit and a power failure anti-theft detection circuit, both of which are connected to an alarm circuit.

[0005] Compared with the prior art, the beneficial effect of this utility model is that the power supply circuit supplies power to the vibration anti-theft circuit and the power failure anti-theft detection circuit. Once someone steals the electric vehicle and the electric vehicle moves, the power failure anti-theft detection circuit will send an alarm signal, and the alarm circuit will emit an alarm sound. Once the battery cable of the electric vehicle is cut, the power failure anti-theft detection circuit will send an alarm signal, and the alarm circuit will emit an alarm sound, thus providing double protection for the electric vehicle and preventing it from being stolen.

[0006] As a further improvement of this utility model, the power supply circuit includes a Zener diode D1. The negative terminal of the Zener diode D1 is connected to the positive terminal of the electric vehicle's battery. The positive terminal of the Zener diode D1 is connected to pin 1 of the three-terminal voltage regulator U1 via resistor R1. Pin 2 of the three-terminal voltage regulator U1 is connected to the negative terminal of the electric vehicle's battery via switch S1. Pin 3 of the three-terminal voltage regulator U1 is connected to the vibration anti-theft detection circuit and the power failure anti-theft detection circuit, respectively.

[0007] In this way, when switch S1 is closed, the battery voltage of the electric vehicle is stepped down and regulated by the Zener diode and the three-terminal voltage regulator, and then outputs the stable voltage required to power the vibration anti-theft circuit and the power failure anti-theft detection circuit, ensuring the stable operation of the circuit.

[0008] As a further improvement of this utility model, the power failure anti-theft detection circuit includes a transistor Q1. The base of transistor Q1 is connected to pin 3 of a three-terminal regulator U1 via resistor R4. The emitter of transistor Q1 is connected to pin 2 of the three-terminal regulator U1. The collector of transistor Q1 is connected to the gate of a silicon controlled rectifier VT1. A resistor R5 is connected between the gate and anode of silicon controlled rectifier VT1. The cathode of silicon controlled rectifier VT1 is connected to an alarm circuit. The anode of silicon controlled rectifier VT1 is connected to the positive terminal of a backup battery B1. The negative terminal of backup battery B1 is connected to the negative terminal of the electric vehicle's battery.

[0009] When the battery cable of the electric vehicle is cut, the transistor Q1 will be cut off due to the lack of bias voltage. The backup battery B1 will provide conduction current to the thyristor VT1 through R5. When the thyristor VT1 is turned on, the speaker will continuously emit an alarm sound, which can deter thieves in time and prevent the electric vehicle from being stolen.

[0010] As a further improvement of this utility model, the vibration anti-theft detection circuit includes a vibration sensor VP. Pin 1 of the vibration sensor VP is connected to one end of resistor R2 and pin 2 of timing pulse chip U2. The other end of resistor R2 is connected to pin 3 of three-terminal regulator U1. Pins 6 and 7 of timing pulse chip U2 are connected and connected to pin 3 of three-terminal regulator U1 via resistor R3. Pins 4 and 8 of timing pulse chip U2 are both connected to pin 3 of three-terminal regulator U1. Pin 1 of timing pulse chip U2 is connected to pin 2 of three-terminal regulator U1 and the negative terminal of capacitor C1. The positive terminal of capacitor C1 is connected to pin 6 of timing pulse chip U2. Pin 3 of timing pulse chip U2 is connected to the positive terminal of diode D2. The negative terminal of diode D2 is connected to the alarm circuit.

[0011] When the electric vehicle is moved, the vibration sensor VP is instantly turned on, generating a pulse signal at pin 2 of the timing pulse chip U2 and outputting a high level at pin 3, which can directly drive the alarm circuit to emit an alarm sound. After the set delay time, the output of the timing pulse chip U2 becomes low, and the alarm ends.

[0012] As a further improvement of this utility model, the alarm circuit includes a speaker U4, the positive terminal of the speaker U4 is connected to the negative terminal of the diode D2 and the cathode of the thyristor VT1, and the negative terminal of the speaker U4 is connected to pin 2 of the three-terminal regulator U1.

[0013] The alarm signals generated by the vibration anti-theft circuit and the power failure anti-theft detection circuit are transmitted to the speaker, causing the speaker to emit an alarm sound. Attached Figure Description

[0014] Figure 1 This is the circuit diagram of this utility model. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings:

[0016] like Figure 1 The electric vehicle anti-theft alarm circuit shown includes a power supply circuit, which is connected to a vibration anti-theft detection circuit and a power failure anti-theft detection circuit, both of which are connected to an alarm circuit.

[0017] The power supply circuit includes a Zener diode D1. The negative terminal of the Zener diode D1 is connected to the positive terminal of the electric vehicle's battery. The positive terminal of the Zener diode D1 is connected to pin 1 of the three-terminal voltage regulator U1 via resistor R1. Pin 2 of the three-terminal voltage regulator U1 is connected to the negative terminal of the electric vehicle's battery via switch S1. Pin 3 of the three-terminal voltage regulator U1 is connected to the vibration anti-theft detection circuit and the power failure anti-theft detection circuit, respectively.

[0018] The power failure anti-theft detection circuit includes transistor Q1. The base of transistor Q1 is connected to pin 3 of three-terminal regulator U1 via resistor R4. The emitter of transistor Q1 is connected to pin 2 of three-terminal regulator U1. The collector of transistor Q1 is connected to the gate of silicon controlled rectifier VT1. Resistor R5 is connected between the gate and anode of silicon controlled rectifier VT1. The cathode of silicon controlled rectifier VT1 is connected to the alarm circuit. The anode of silicon controlled rectifier VT1 is connected to the positive terminal of backup battery B1. The negative terminal of backup battery B1 is connected to the negative terminal of electric vehicle battery.

[0019] The vibration anti-theft detection circuit includes a vibration sensor VP. Pin 1 of the vibration sensor VP is connected to one end of resistor R2 and pin 2 of timing pulse chip U2. The other end of resistor R2 is connected to pin 3 of three-terminal regulator U1. Pins 6 and 7 of timing pulse chip U2 are connected and then connected to pin 3 of three-terminal regulator U1 via resistor R3. Pins 4 and 8 of timing pulse chip U2 are both connected to pin 3 of three-terminal regulator U1. Pin 1 of timing pulse chip U2 is connected to pin 2 of three-terminal regulator U1 and the negative terminal of capacitor C1. The positive terminal of capacitor C1 is connected to pin 6 of timing pulse chip U2. Pin 3 of timing pulse chip U2 is connected to the positive terminal of diode D2. The negative terminal of diode D2 is connected to the alarm circuit.

[0020] The alarm circuit includes a speaker U4. The positive terminal of the speaker U4 is connected to the negative terminal of the diode D2 and the cathode of the thyristor VT1, respectively. The negative terminal of the speaker U4 is connected to pin 2 of the three-terminal regulator U1.

[0021] In this invention, the battery voltage of the electric vehicle is regulated by the Zener diode VD1 and the three-terminal regulator to power the circuit. The vibration sensor VP is in the off state under safe conditions. Pin 2 of the timing pulse chip U2 is at a high level and pin 3 outputs a low level. Since the transistor Q1 has no trigger current, it is in the cut-off state and the speaker has no voltage input.

[0022] When someone moves the electric vehicle, the vibration sensor VP is turned on instantly, generating a pulse signal at pin 2 of the timing pulse chip U2. The timing pulse chip U2 outputs a high level, driving the speaker to emit an alarm signal. The timing pulse chip U2 is an NE555, and the alarm duration can be set. For example, it can be set to output a low level after 10 seconds, that is, the alarm duration is 10 seconds, and the alarm stops after 10 seconds.

[0023] If someone attempts to cut the battery cable of the electric vehicle, the transistor Q1 will be cut off due to the lack of bias voltage. The backup power supply will provide conduction current to the thyristor VT1 through R5, causing VT1 to conduct and the speaker to continuously emit an alarm sound. The alarm will only stop when the switch S1 is opened. When the owner is using the electric vehicle normally, the switch S1 should be placed in the open position to stop the circuit from working. When the owner is storing the electric vehicle, the switch should be closed to allow the alarm circuit to work normally.

[0024] This circuit can be integrated onto a single circuit board, which is rigidly connected to the electric vehicle. It is best to use screws or adhesive to secure it, minimizing signal attenuation between the vibration source and the sensor. Furthermore, switch S1 should be placed in a relatively concealed location on the electric vehicle.

[0025] This utility model has a simple circuit, few components, and is easy to manufacture. In addition to the relocation alarm, it also has the function of immediately sounding an alarm when a thief attempts to cut off the power supply of the electric vehicle battery, thus realizing a dual anti-theft alarm.

[0026] This utility model is not limited to the above embodiments. Based on the technical solutions disclosed herein, those skilled in the art can make some substitutions and modifications to some of the technical features without creative labor, and these substitutions and modifications are all within the protection scope of this utility model.

Claims

1. An anti-theft alarm circuit for an electric vehicle, characterized by: The power supply circuit is connected with the vibration anti-theft detection circuit and the power-off anti-theft detection circuit respectively, and the vibration anti-theft detection circuit and the power-off anti-theft detection circuit are connected with the alarm circuit; The power supply circuit comprises a stabilizing diode D1, the negative electrode of the stabilizing diode D1 is connected with the positive electrode of the storage battery of the electric vehicle, the positive electrode of the stabilizing diode D1 is connected with the 1 pin of a three-terminal stabilizer U1 through a resistor R1, the 2 pin of the three-terminal stabilizer U1 is connected with the negative electrode of the storage battery of the electric vehicle through a switch S1, and the 3 pin of the three-terminal stabilizer U1 is connected with the vibration anti-theft detection circuit and the power-off anti-theft detection circuit respectively. The power-off anti-theft detection circuit comprises a triode Q1, the base of the triode Q1 is connected with the 3 pin of the three-terminal stabilizer U1 through a resistor R4, the emitter of the triode Q1 is connected with the 2 pin of the three-terminal stabilizer U1, the collector of the triode Q1 is connected with the gate of a thyristor VT1, the resistor R5 is connected between the gate and the anode of the thyristor VT1, the cathode of the thyristor VT1 is connected with the alarm circuit, the anode of the thyristor VT1 is connected with the positive electrode of a backup battery B1, and the negative electrode of the backup battery B1 is connected with the negative electrode of the storage battery of the electric vehicle.

2. The theft alarm circuit for electric vehicle according to claim 1, wherein: The vibration anti-theft detection circuit comprises a vibration sensor VP, the 1 pin of the vibration sensor VP is connected with one end of a resistor R2 and the 2 pin of a timing pulse chip U2 respectively, the other end of the resistor R2 is connected with the 3 pin of the three-terminal stabilizer U1, the 6 pin and the 7 pin of the timing pulse chip U2 are connected and connected with the 3 pin of the three-terminal stabilizer U1 through a resistor R3, the 4 pin and the 8 pin of the timing pulse chip U2 are connected with the 3 pin of the three-terminal stabilizer U1, the 1 pin of the timing pulse chip U2 is connected with the 2 pin of the three-terminal stabilizer U1 and the negative electrode of a capacitor C1 respectively, the positive electrode of the capacitor C1 is connected with the 6 pin of the timing pulse chip U2, the 3 pin of the timing pulse chip U2 is connected with the positive electrode of a diode D2, and the negative electrode of the diode D2 is connected with the alarm circuit.

3. The theft alarm circuit for electric vehicle according to claim 2, wherein: The alarm circuit comprises a loudspeaker U4, the positive electrode of the loudspeaker U4 is connected with the negative electrode of the diode D2 and the cathode of the thyristor VT1 respectively, and the negative electrode of the loudspeaker U4 is connected with the 2 pin of the three-terminal stabilizer U1.

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