Protection device for preventing disassembly of sensor

Abstract

The utility model provides a protection device for preventing disassembly of a sensor, which comprises a circuit board, the sensor is electrically connected with the circuit board through plugging, the input end of the sensor is connected with the positive electrode of a clock battery B1 and the positive electrode of a lithium ion battery B2, and the lithium ion battery B2 charges the clock battery B1. The output end of the circuit board is connected with a serial data pin 5, a serial clock pin 6 and a power supply pin 8 of the clock chip U. A crystal oscillator input pin 1 and a crystal oscillator output pin 2 of the clock chip U are connected with the crystal oscillator X. The negative electrode of the clock battery B1, the negative electrode of the lithium ion battery B2, the grounding pin 4 of the clock chip U and the crystal oscillator are grounded together. When the sensor is used, if a user replaces the sensor, the clock circuit is invalid, so that whether the user operation is reasonable or not is judged, the non-standard operation of the user is supervised, and the sensor is effectively prevented from being replaced at will.

Description

TECHNICAL FIELD

[0001] The utility model relates to a gas sensor technical field especially relates to a protection device of preventing sensor's disassembly. BACKGROUND

[0002] Portable gas sensor is widely used in natural gas, petroleum, chemical industry and other industries due to small size and light weight, and is usually carried by field operation personnel, and is fixed by the body or handheld, so as to detect harmful gas leakage in real time, and the safety of field personnel and equipment is guaranteed.

[0003] However, the assembly mode of the portable gas sensor is simple, and each part of the detector is assembled by screws, buckles and the like, and the sensor is plug-in type, so as long as the user has a simple tool, the sensor can be easily opened, and due to the complex field environment, the gas sensor as one of the core components of the detector may be privately disassembled and replaced by the field personnel due to various reasons, which may affect the accuracy of the detector, or even cause the detector to malfunction and delay the critical time, and due to the limitation of time and space, the illegal operation is difficult to trace back, which increases the difficulty of field troubleshooting. SUMMARY

[0004] The utility model aims at providing a protection device of preventing sensor's disassembly, and the clock circuit is invalid when the sensor is replaced.

[0005] In order to realize the above-mentioned purpose, the technical scheme of the utility model is:

[0006] A protection device of preventing sensor's disassembly, characterized by comprising a circuit board, the sensor is electrically connected with the circuit board through plug-in, the input end of the sensor is connected with the positive pole of clock battery B1 and lithium ion battery B2, the lithium ion battery B2 charges the clock battery B1, the output end of the circuit board is connected with the serial data pin 5 pin, serial clock pin 6 pin and power supply pin 8 pin of clock chip U respectively, the crystal oscillator input pin 1 pin and crystal oscillator output pin 2 pin of the clock chip U are connected with crystal oscillator X, the negative pole of the clock battery B1, the negative pole of the lithium ion battery B2, the ground pin 4 pin of the clock chip U and the crystal oscillator are grounded in common.

[0007] Further, the output end of the circuit board 1 is connected with the positive pole of diode D, and the negative pole of diode D is connected with the serial data pin 5 pin, serial clock pin 6 pin and power supply pin 8 pin of clock chip U respectively.

[0008] Further, the negative pole of diode D is connected with one end of first capacitor C1, and the other end of first capacitor C1 is grounded.

[0009] Furthermore, the serial data pin 5 of the clock chip U is provided with a first resistor R1, and the serial clock pin 6 of the clock chip U is provided with a second resistor R2.

[0010] Furthermore, the input terminal of the crystal oscillator X is connected to one end of the second capacitor C2, the output terminal of the crystal oscillator X is connected to one end of the third capacitor C3, and the other ends of the second capacitor C2 and the third capacitor C3 are grounded.

[0011] When this utility model is in use, if the user replaces the sensor, the clock circuit will fail. This allows the system to determine whether the user's operation is reasonable, monitor non-standard operations, and effectively prevent the sensor from being replaced arbitrarily. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the circuit structure of this utility model;

[0013] Figure 2 This is a schematic diagram of the sensor installation of this utility model.

[0014] Figure label:

[0015] 1. Circuit board, 2. Sensor,

[0016] C1 is the first capacitor, C2 is the second capacitor, and C3 is the third capacitor.

[0017] R1 (first resistor), R2 (second resistor), U (clock chip)

[0018] B1 clock battery, B2 lithium-ion battery, X crystal oscillator. Detailed Implementation

[0019] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0020] This embodiment discloses a protective device to prevent the disassembly of a sensor, such as... Figure 2 As shown, the device includes a circuit board 1, and a sensor 2 is electrically connected to the circuit board 1 via a plug-in connection.

[0021] like Figure 1 As shown, the input terminal of sensor 2 is connected to the positive terminals of clock battery B1 and lithium-ion battery B2. The negative terminals of clock battery B1 and lithium-ion battery B2 are grounded. Clock battery B1 is a CR1220 lithium manganese dioxide battery with a standard operating voltage of 3.0V. Lithium-ion battery B2 is an ML621 rechargeable lithium battery with a standard operating voltage of 3.0V.

[0022] The protection device comprises a clock chip U, the clock chip U adopts a BM8563 low-power-consumption CMOS real-time clock / calendar chip, output ends of the circuit board 1 are connected with a serial data pin 5 pin, a serial clock pin 6 pin and a power supply pin 8 pin of the clock chip U respectively, the serial data pin 5 pin of the clock chip U is provided with a first resistor R1, the serial clock pin 6 pin of the clock chip U is provided with a second resistor R2, a ground pin 4 pin of the clock chip U is grounded, and the first resistor R1 and the second resistor R2 are both 10KΩ.

[0023] As shown in Figure 1 , a crystal oscillator input pin 1 pin and a crystal oscillator output pin 2 pin of the clock chip U are connected with a crystal oscillator X, the crystal oscillator X is 32.768KHz, an input end of the crystal oscillator X is connected with one end of a second capacitor C2, an output end of the crystal oscillator X is connected with one end of a third capacitor C3, the other ends of the second capacitor C2 and the third capacitor C3 are grounded, and the second capacitor C2 and the third capacitor C3 are both 6pF, the 6pF capacitor and the crystal oscillator X together determine the working frequency of an oscillator circuit, and by adjusting the load capacitors of the second capacitor C2 and the third capacitor C3, the working frequency of the oscillator can be fine-tuned to a nominal value.

[0024] An anode of a diode D is connected with an output end of the circuit board 1, the diode D is an IN4148WS patch switch diode, a cathode of the diode D is connected with the serial data pin 5 pin, the serial clock pin 6 pin and the power supply pin 8 pin of the clock chip U respectively, the cathode of the diode D is connected with one end of a first capacitor C1, the first capacitor C1 is 100nF and plays a role of decoupling, and the other end of the first capacitor C1 is grounded.

[0025] When the product of the embodiment is used, as shown in Figure 1 , a lithium ion battery B2 charges a clock battery B1, the clock battery B1 is always in full-power operation, and a power supply line of the clock battery B1 is bridged to the circuit board, when the sensor 2 is pulled off from the circuit board 1, the clock chip U will be powered off.

[0026] When normally working, the lithium ion battery B2 and an external charger ensure that the clock battery B1 is always powered, the clock chip U is always normally working, and the time is correct, if the user replaces the sensor, the clock chip U will be powered off, leading to clock error.

[0027] When the product of the embodiment is started, whether the time of the real-time clock of the clock chip U is correct is detected, if correct, the product normally works, if incorrect, an authorization code needs to be input to reactivate the product.

[0028] Finally, it should be noted that: the above embodiments are used to illustrate the technical solutions of the present application, but not limited to them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A protection device for preventing disassembly of a sensor, characterized in that The circuit board (1) is connected with the sensor (2) by plug-in electrical connection, the input end of the sensor (2) is connected with the positive pole of the clock battery (B1) and the lithium ion battery (B2), the lithium ion battery (B2) charges the clock battery (B1), the output end of the circuit board (1) is connected with the serial data pin 5 pin, the serial clock pin 6 pin and the power supply pin 8 pin of the clock chip (U) respectively, the crystal oscillator input pin 1 pin and the crystal oscillator output pin 2 pin of the clock chip (U) are connected with the crystal oscillator (X), the negative pole of the clock battery (B1), the negative pole of the lithium ion battery (B2), the ground pin 4 pin of the clock chip (U) and the crystal oscillator are grounded in common.

2. The protection device for preventing disassembly of a sensor according to claim 1, characterized by The output end of the circuit board (1) is connected with the positive pole of the diode (D), the negative pole of the diode (D) is connected with the serial data pin 5 pin, the serial clock pin 6 pin and the power supply pin 8 pin of the clock chip (U) respectively.

3. The protection device for preventing disassembly of a sensor according to claim 2, characterized by The negative pole of the diode (D) is connected with one end of the first capacitor (C1), the other end of the first capacitor (C1) is grounded.

4. The protection device for preventing disassembly of a sensor according to claim 1, characterized by The serial data pin 5 pin of the clock chip (U) is provided with the first resistor (R1), the serial clock pin 6 pin of the clock chip (U) is provided with the second resistor (R2).

5. The protection device for preventing disassembly of a sensor according to Claim 1, characterized by The input end of the crystal oscillator (X) is connected with one end of the second capacitor (C2), the output end of the crystal oscillator (X) is connected with one end of the third capacitor (C3), the other end of the second capacitor (C2) and the third capacitor (C3) is grounded.

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