Encryption electric lock control circuit and control method thereof

Abstract

The invention discloses an encryption electric lock control circuit and a control method thereof, and relates to the technical field of electricity. The safety and reliability of the electric lock control circuit can be improved. According to the main technical scheme, an unlocking signal sending end coding circuit, an unlocking signal receiving end decoding circuit, a power supply module and an electronic switching circuit are included, an unlocking signal is coded and encrypted through the sending end coding circuit and then sent to a receiving end for decoding verification, and after verification is correct, the receiving end decoding circuit outputs a high level to the control end of the electronic switching circuit; and after the control end receives the high-level signal, the electronic switch is switched on, and the electric lock is unlocked. According to the electric lock control circuit and the control method thereof, the safety coefficient is high, green and energy-saving effects are achieved, the performance is excellent, the size is small, the electric lock control circuit can be installed inside or outside an electric lock, and original equipment does not need to be replaced.

Description

Technical Field

[0001] The present invention relates to the field of electrical technology, and particularly relates to an encrypted electric lock control circuit and a control method thereof. Background Art

[0002] With the improvement of people's security awareness, the requirements for the convenience and security of access control systems are getting higher and higher, especially for the military, government, confidential units, etc. which attach particular importance to security. Most of the existing electric locks are unlocked by power-on or power-off. If the control line of the lock is cut, the power-off unlocked electric lock will be opened. If the control circuit of the lock is powered on, the power-on unlocked electric lock will be opened. While bringing convenience to people's access, the safety factor is relatively low. Especially for public area access control such as residential area access control, the line is more likely to be damaged and the access control becomes ineffective.

[0003] In summary, it is urgent to develop a circuit that controls the unlocking of an electric lock through an encrypted signal with a high safety factor. Summary of the Invention

[0004] In order to overcome the above technical drawbacks, the present invention provides an electric lock control circuit and a control method thereof with high safety factor, green energy saving, excellent performance, and small size that can be installed inside or outside the electric lock. Even if the control line of the lock is cut or powered on, the lock cannot be opened. Only when the encrypted control signal is verified with the pre-set verification information inside, and the verification is correct, can the lock be opened, greatly increasing the safety factor of the electric lock.

[0005] The above technical object is achieved through the following technical solutions. An encrypted electric lock control circuit includes an unlocking signal sending end encoding circuit, an unlocking signal receiving end decoding circuit, a power supply module, and an electronic switch circuit.

[0006] The unlocking signal sending end encoding circuit includes an encoding IC.

[0007] The unlocking signal receiving end decoding circuit includes a decoding IC.

[0008] Preferably, the power supply module is a DC power supply module.

[0009] The electronic switch circuit includes an electronic switch.

[0010] Preferably, the electronic switch is an NMOS low-side power switch.

[0011] Preferably, the D pole of the NMOS transistor is connected to the electric lock, the other end of the electric lock is connected to the positive power supply (VCC), and the S pole of the NMOS transistor is connected to the negative power supply (GND).

[0012] The input pin of the encoding IC is electrically connected to the unlocking signal, and the output pin of the encoding IC is electrically connected to the input pin of the decoding IC.

[0013] The input pin of the decoding IC is electrically connected to the output pin of the encoding IC, and the output pin of the decoding IC is electrically connected to the electronic switch circuit.

[0014] The output pin of the decoding IC is electrically connected to the control terminal of the electronic switch circuit.

[0015] The switch terminal of the electronic switch circuit is connected in series to the power supply unlocking circuit inside the electric lock to supply power to the electric lock.

[0016] The output pin of the decoding IC is electrically connected to the gate of the NMOS transistor in the switch circuit. A 10K resistor is added between the gate of the NMOS transistor and the power supply ground (GND). The drain of the NMOS transistor is connected to the negative pole of the power-on unlocking terminal of the electric lock. The positive pole of the power-on unlocking terminal of the electric lock is electrically connected to the positive pole of the power supply, and the source of the NMOS transistor is electrically connected to the power supply ground (GND).

[0017] Compared with the prior art, the present invention provides an encrypted electric lock control circuit and its control method, which have the following beneficial effects.

[0018] 1. The present invention has a high safety factor. The line between the access control controller and the electric lock no longer fears that the electric lock will be opened due to damaged lines.

[0019] 2. The circuit of the present invention is small in size and can be embedded into our access control controller and electric lock, or can be separately installed inside or outside the equipment already in use, without the need to replace the original equipment.

[0020] Other advantages, objectives, and features of the present invention will be described to some extent in the subsequent specification; and to some extent, based on the study of the following text, they will be obvious to those skilled in the art; or, they can be taught from the practice of the present invention.

[0021] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings herein are incorporated into the specification and constitute a part of this specification, showing embodiments consistent with this application, and are used together with the specification to explain the principles of this application.

[0023] Figure 1 The working flowchart of an embodiment of the encrypted electric lock control circuit and its control method of this application.

[0024] Figure 2 Figure 1The circuit diagram of the encrypted electric lock control circuit and its control method as shown. Embodiment

[0025] Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0026] The terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. Unless otherwise defined, the technical terms or scientific terms used in the present application should be the ordinary meanings understood by those of ordinary skill in the field to which the present application belongs. The "first", "second" and similar terms used in the specification and claims of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, the terms such as "a" or "an" do not indicate a quantity limitation, but indicate that there is at least one. "Multiple" or "several" means two or more. Unless otherwise indicated, the similar terms such as "front part", "rear part", "lower part" and / or "upper part" are only for convenience of description and are not limited to one position or a spatial orientation. The terms such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprise" cover the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. The terms such as "connect" or "couple" are not limited to physical or mechanical connections, and may include electrical connections, whether direct or indirect.

[0027] The terms used in the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The singular forms of "a", "the" and "said" used in the present application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0028] This embodiment, for example Figure 1 - Figure 2 As shown, an encrypted electric lock control circuit and its control method include an unlocking signal sending end encoding circuit, an unlocking signal receiving end decoding circuit, a power supply module and an electronic switch circuit.

[0029] The unlocking signal transmitting end encoding circuit includes an encoding IC U1, a diode D1, a switch S1, a resistor R1, and a resistor R3. The output pin Dout of the encoding IC U1 is connected to the input pin Din of the decoding IC. The 18th pin VCC of the encoding IC U1 is connected to the negative electrode of the diode D1, and the positive electrode of the diode D1 is connected to the positive power supply (VCC) of the power supply module through the switch S1. The 9th pin VSS of the encoding IC U1 is connected to the negative power supply (GND) of the power supply module. The 13th input pin of the encoding IC U1 is connected to the positive power supply (VCC) of the power supply module through S1, and the 13th input pin of the encoding IC U1 is connected to the negative power supply (GND) of the power supply module through the resistor R1.

[0030] The unlocking signal receiving end decoding circuit includes a decoding IC U2 and a resistor R4. The input pin Din of the decoding IC U2 is connected to the output pin Dout of the encoding IC U1. The 13th output pin of the decoding IC U2 is connected to the control end of the electronic switch circuit. The 18th pin VCC of the decoding IC U2 is connected to the positive power supply (VCC) of the power supply module, and the 9th pin VSS of the decoding IC U2 is connected to the negative power supply (GND) of the power supply module.

[0031] The power supply module is a +12VDC power supply module, including the positive power supply (VCC) of the power supply module and the negative power supply (GND) of the power supply module.

[0032] The electronic switch circuit includes an NMOS transistor Q1, a resistor R2, and a diode D2. The G pole of the NMOS transistor Q1 is connected to the 13th output pin of the decoding IC U2. The G pole of the NMOS transistor Q1 is connected to the negative power supply (GND) of the power supply module through the resistor R2. The S pole of the NMOS transistor Q1 is connected to the negative power supply (GND) of the power supply module. The D pole of the NMOS transistor Q1 is connected to one end of the electric lock, and the other end of the electric lock is connected to the positive power supply (VCC) of the power supply module. The D pole of the NMOS transistor Q1 is connected in parallel with the positive electrode of the diode D2, and the negative electrode of the diode D2 is connected to the positive power supply (VCC) of the power supply module.

[0033] Working principle: The 14th pin / TE of the encoding IC U1 is connected to the negative power supply (GND) of the power supply module to pull down the enable terminal to be effective. When S1 is closed, power is supplied to the encoding IC U1 through the diode D1, and at the same time, it serves as an unlocking signal to the 13th input pin of the encoding IC U1. After the U1 encoding IC encodes, the output pin Dout outputs an encoded and encrypted unlocking signal to the input pin Din of the U2 decoding IC. After receiving the encoded and encrypted unlocking signal sent by the UI encoding IC, the U2 decoding IC decodes it and verifies it with the information preset in the U2 decoding IC. After the verification passes, the output pin 13 of the U2 decoding IC outputs a high level to the control terminal G of the NMOS transistor Q1. After the G terminal receives the high-level control signal, the D terminal and the S terminal are turned on. One end of the electric lock is connected to the positive power supply (VCC) of the power supply module, and the other end is connected to the D terminal of the NMOS transistor. After the D terminal and the S terminal of the NMOS transistor Q1 are turned on, power is supplied to the electric lock, and the electric lock is unlocked.

[0034] In the above solution, the encoding IC and the decoding IC can be paired encoding and decoding ICs such as PT2262 and PT2272, or an MCU and an encoding and decoding IC can be used in combination. It is also possible to use only MCUs for both encoding and decoding. Fixed encoding and decoding chips or rolling code encoding and decoding chips can be used, etc.; the electronic switch can be an NMOS transistor, a PMOS transistor, a relay, etc.

[0035] Those skilled in the art will readily conceive of other embodiments of the present application after considering the specification and the practice disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application, which follow the general principles of the present application and include known common knowledge or conventional technical means in the technical field not disclosed in the present application. The specification and the embodiments are only regarded as exemplary, and the true scope and spirit of the present application are pointed out by the following claims.

[0036] It should be understood that the present application is not limited to the exact structure already described and shown in the drawings, and various modifications and changes can be made without departing from its scope. However, as long as it is within the scope of the claims of the present invention, it is protected by the patent law.

Claims

1. An encrypted electric lock control circuit and its control method, characterized in that It includes an encoding circuit for the unlocking signal transmitting end, a decoding circuit for the unlocking signal receiving end, a power supply module, and an electronic switch circuit.

2. The encryption electric lock control circuit and its control method according to claim 1, characterized in that The encoding circuit includes an encoding chip U1.

3. The encryption electric lock control circuit and its control method according to claim 1, characterized in that The decoding circuit includes a decoding chip U2.

4. The encryption electric lock control circuit and its control method according to claim 1, characterized in that The power supply module is a DC power supply module, including a power supply positive electrode (VCC) and a power supply negative electrode (GND).

5. The encryption electric lock control circuit and its control method according to claim 1, characterized in that The electronic switch circuit includes a MOS switch tube Q1 and a resistor R1.

6. The encryption electric lock control circuit and its control method according to claim 2, characterized in that The I / O input pin of the encoding chip U1 is electrically connected to the unlocking signal, the VCC of the encoding chip U1 is electrically connected to the power supply positive electrode (VCC) of the power supply module, and the GND of the encoding chip U1 is electrically connected to the power supply negative electrode (GND) of the power supply module.

7. The encryption electric lock control circuit and its control method according to claim 3, characterized in that The I / O input pin of the decoding chip U2 is electrically connected to the I / O output pin of the encoding chip U1, the I / O output pin of the decoding chip U2 is electrically connected to the G pole of the NMOS switch tube in the electronic switch circuit, the VCC of the decoding chip U2 is electrically connected to the power supply positive electrode (VCC) of the power supply module, and the GND of the decoding chip U2 is electrically connected to the power supply negative electrode (GND) of the power supply module.

8. The encryption electric lock control circuit and its control method according to claim 5, characterized in that The G pole of the MOS tube Q1 in the electronic switch circuit is electrically connected to the I / O output pin of U2. One end of the resistor R1 is electrically connected to the G pole of the MOS tube and the other end is connected to the power supply negative electrode (GND). The D pole of the MOS tube is electrically connected to the electric lock, and the other end of the electric lock is connected to the power supply positive electrode (VCC).

9. The encryption electric lock control circuit and its control method according to claim 5, characterized in that A diode VD2 is added between the D pole of the NMOS tube in the electronic switch circuit and the power supply positive electrode (VCC).

10. An encrypted electric lock control circuit and its control method, characterized in that, It includes: Used to implement the encrypted electric lock control circuit and its control method as described in any one of claims 1 to 9.

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