Battery tamper alarm circuit

Abstract

The utility model provides a battery anti-tamper alarm circuit, including chip U802, resistor R807, resistor R808, resistor R809, resistor R810, MOS tube Q800 and capacitor C803, the pin 3 of chip U802 is connected with resistor R807 and resistor R808, the other end of resistor R807 is grounded, the other end of resistor R808 is connected with capacitor C804, the other end of capacitor C804 is grounded. Compared with a common battery anti-tamper alarm circuit, the battery anti-tamper alarm circuit has the advantages that a dual-identification circuit is used, the alarm can be given only when the dual-identification circuit needs to be simultaneously met, and the possibility of mistakenly touching the alarm is greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery anti-disassembly alarm circuit. Background Art

[0002] At present, magnetic switches, micro switches or some other special resistors are often used in battery anti-tampering alarm circuits. Magnetic switches and their micro switches are easily disturbed by the environment and cause false touches. At the same time, they are affected by factors such as temperature and magnetic field, which will lead to unstable performance. Utility Model Content

[0003] In order to make up for the deficiencies of the prior art, the embodiments of the present application solve the problems in the prior art by providing a battery anti-tampering alarm circuit.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions:

[0005] A battery anti-disassembly alarm circuit comprises a vibration switch detection circuit, a photoresistor detection circuit, an MCU and a buzzer alarm circuit, wherein the MCU is respectively connected to the vibration switch detection circuit, the photoresistor detection circuit and the buzzer alarm circuit.

[0006] As a further technical solution of the utility model: the photoresistor detection circuit includes a resistor R522, a resistor R526, a capacitor C813 and a photoresistor U503, one end of the resistor R522 is connected to the power supply end VCC_MCU, the other end of the resistor R522 is connected to the resistor R526 and the photoresistor U503, the other end of the resistor R526 is connected to the MCU and the capacitor C813, and the other end of the photoresistor U503 is connected to the other end of the capacitor C813 and the ground end.

[0007] As a further technical solution of the utility model: the vibration switch detection circuit includes a vibration switch SW1, a resistor R523 and a capacitor C814, one end of the resistor R523 is connected to the power supply end VCC_MCU, the other end of the resistor R523 is connected to the vibration switch SW1 and the capacitor C814, and the other end of the capacitor C814 is connected to the other end of the vibration switch SW1.

[0008] As a further technical solution of the utility model: the buzzer alarm circuit includes a transistor Q1, a resistor R5, a resistor R6, a resistor R4, a diode D2 and a speaker U2, one end of the resistor R5 is connected to the MCU, the other end of the resistor R5 is connected to the base of the transistor Q1 and the resistor R6, the other end of the resistor R6 is connected to the emitter of the transistor Q1 and the ground terminal, the collector of the transistor Q1 is connected to the resistor R4, the other end of the resistor R4 is connected to the anode of the diode D2 and the speaker U2, and the cathode of the diode D2 is connected to the other end of the speaker U2.

[0009] As a further technical solution of the utility model: the transistor Q1 is an NPN transistor.

[0010] One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:

[0011] This circuit collects the change values ​​of U503 photoresistor and SW1 vibration switch, and transmits them to the single-chip microcomputer, which makes a judgment. If they are triggered at the same time, an alarm will be sounded. Compared with the general battery anti-tampering alarm circuit, this circuit uses a double recognition circuit, which must be met at the same time before an alarm will be sounded, greatly reducing the possibility of false alarm. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a circuit diagram of the utility model. DETAILED DESCRIPTION

[0013] The technical solutions in the embodiments of the utility model are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0014] Reference Figure 1 A battery anti-disassembly alarm circuit includes a vibration switch detection circuit, a photoresistor detection circuit, an MCU and a buzzer alarm circuit, wherein the MCU is connected to the vibration switch detection circuit, the photoresistor detection circuit and the buzzer alarm circuit respectively.

[0015] The photoresistor detection circuit includes a resistor R522, a resistor R526, a capacitor C813 and a photoresistor U503, one end of the resistor R522 is connected to the power supply terminal VCC_MCU, the other end of the resistor R522 is connected to the resistor R526 and the photoresistor U503, the other end of the resistor R526 is connected to the MCU and the capacitor C813, and the other end of the photoresistor U503 is connected to the other end of the capacitor C813 and the ground terminal.

[0016] The vibration switch detection circuit includes a vibration switch SW1, a resistor R523 and a capacitor C814, one end of the resistor R523 is connected to the power supply terminal VCC_MCU, the other end of the resistor R523 is connected to the vibration switch SW1 and the capacitor C814, and the other end of the capacitor C814 is connected to the other end of the vibration switch SW1.

[0017] The buzzer alarm circuit includes a transistor Q1, a resistor R5, a resistor R6, a resistor R4, a diode D2 and a speaker U2. One end of the resistor R5 is connected to the MCU, the other end of the resistor R5 is connected to the base of the transistor Q1 and the resistor R6, the other end of the resistor R6 is connected to the emitter of the transistor Q1 and the ground terminal, the collector of the transistor Q1 is connected to the resistor R4, the other end of the resistor R4 is connected to the anode of the diode D2 and the speaker U2, and the cathode of the diode D2 is connected to the other end of the speaker U2.

[0018] Here’s how it works:

[0019] This circuit is integrated on the battery protection board and will be installed in the battery shell. There is no light source in the shell. The working logic of the photoresistor U1 is that the resistance will change when light is detected. The stronger the light, the smaller the resistance value, and vice versa, the weaker the light, the larger the resistance value. The working logic of the vibration switch SW1 is that the resistance will change when vibration is detected, and the static state is an open circuit state. In normal use, SW1 will act frequently, but U1 will not detect light, so no alarm will be triggered. However, during the disassembly process, the circuit will be exposed to the light source, and the disassembly will inevitably cause vibration. At this time, the MCU detects the changes in the two sets of signals at the same time, and judges that someone has disassembled the battery. Then the MCU pin outputs a voltage to control the switch of Q1. At this time, the buzzer is turned on to alarm.

[0020] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0021] In addition, it should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment have also been appropriately combined to form other implementation modes that are easy for those skilled in the art to understand.

Claims

1. A battery anti-tampering alarm circuit, comprising a vibration switch detection circuit, a photoresistor detection circuit, an MCU and a buzzer alarm circuit, characterized in that: The MCU is respectively connected to a vibration switch detection circuit, a photoresistor detection circuit and a buzzer alarm circuit.

2. A battery anti-tampering alarm circuit according to claim 1, characterized in that: The photoresistor detection circuit includes a resistor R522, a resistor R526, a capacitor C813 and a photoresistor U503, one end of the resistor R522 is connected to the power supply end VCC_MCU, the other end of the resistor R522 is connected to the resistor R526 and the photoresistor U503, the other end of the resistor R526 is connected to the MCU and the capacitor C813, and the other end of the photoresistor U503 is connected to the other end of the capacitor C813 and the ground end.

3. A battery anti-tampering alarm circuit according to claim 1, characterized in that: The vibration switch detection circuit includes a vibration switch SW1, a resistor R523 and a capacitor C814, one end of the resistor R523 is connected to the power supply end VCC_MCU, the other end of the resistor R523 is connected to the vibration switch SW1 and the capacitor C814, and the other end of the capacitor C814 is connected to the other end of the vibration switch SW1.

4. A battery anti-tampering alarm circuit according to claim 1, characterized in that: The buzzer alarm circuit includes a transistor Q1, a resistor R5, a resistor R6, a resistor R4, a diode D2 and a speaker U2, one end of the resistor R5 is connected to the MCU, the other end of the resistor R5 is connected to the base of the transistor Q1 and the resistor R6, the other end of the resistor R6 is connected to the emitter of the transistor Q1 and the ground terminal, the collector of the transistor Q1 is connected to the resistor R4, the other end of the resistor R4 is connected to the anode of the diode D2 and the speaker U2, and the cathode of the diode D2 is connected to the other end of the speaker U2.

5. A battery anti-tampering alarm circuit according to claim 4, characterized in that: The transistor Q1 is an NPN transistor.

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