CN216595543U

CN216595543U - Transmitting circuit and security check door

Info

Publication number: CN216595543U
Application number: CN202120775787.4U
Authority: CN
Inventors: 邹远杰
Original assignee: Hangzhou Ruiying Technology Co ltd
Current assignee: Hangzhou Ruiying Technology Co ltd
Priority date: 2021-04-15
Filing date: 2021-04-15
Publication date: 2022-05-24
Anticipated expiration: 2031-04-15

Abstract

The embodiment of the specification provides a transmitting circuit and a security inspection door. The transmission circuit includes: the controller is electrically connected with the adjustable gain power amplifier and used for providing a first control signal and a second control signal for the adjustable gain power amplifier, and the second control signal is used for controlling the amplification factor of the adjustable gain power amplifier; the adjustable gain power amplifier is electrically connected with the transmitting coil and used for amplifying the first control signal and outputting the first control signal to the transmitting coil; the feedback module is respectively electrically connected with the controller and the adjustable gain power amplifier and is used for receiving the signal output by the adjustable gain power amplifier, processing the signal and feeding the processed signal back to the controller; and the controller is further used for modulating the first control signal and the second control signal according to the signal fed back by the feedback module so as to adjust the signal output by the adjustable gain power amplifier to a reference amplitude and frequency. Therefore, the adaptive modulation of the control signal can be carried out through the feedback signal, and the amplification suitable for various frequency points is ensured.

Description

Transmitting circuit and security check door

Technical Field

This document relates to electronic circuit technical field, especially relates to a transmitting circuit and security check door.

Background

The transmitting circuit outputs signals to drive the transmitting coil to transmit a magnetic field to a space, and the receiving coil of the receiving circuit induces voltage signals, and transmits the signals to the single chip microcomputer for analysis and processing after acquisition and processing.

However, in the conventional circuit technology, the power amplifier circuit of the transmitter circuit is only suitable for single frequency amplification, and if the power amplifier circuit is required to be suitable for multiple frequency points, the Pulse Width Modulation (PWM) of the control signal needs to be debugged, which results in a large debugging workload. In the receiving circuit, the analog switch is used for intercepting the useful signal output by the first-stage amplifying circuit, the BC signal is required to be used for controlling, the frequency of the BC signal is required to be the same as the frequency of the PWM signal in the transmitting circuit, the phase difference can be better to intercept the useful signal, but the receiving circuit has 16 paths in the security check gate, and the BC is difficult to control to achieve the purpose of intercepting the useful signal.

Therefore, it is desirable to provide a more reliable transmission circuit and reception circuit.

Disclosure of Invention

The embodiment of the specification provides a transmitting circuit and a security check door, which are suitable for amplification of various frequency points.

Embodiments of the present specification further provide a transmitting circuit, including: controller, adjustable gain power amplifier, feedback module and transmitting coil, wherein:

the controller is electrically connected with the adjustable gain power amplifier and used for providing a first control signal and a second control signal for the adjustable gain power amplifier, and the second control signal is used for controlling the amplification factor of the adjustable gain power amplifier;

the adjustable gain power amplifier is electrically connected with the transmitting coil and used for amplifying the first control signal and outputting the first control signal to the transmitting coil;

the feedback module is respectively electrically connected with the controller and the adjustable gain power amplifier and is used for receiving the signal output by the adjustable gain power amplifier, processing the signal and feeding the processed signal back to the controller;

the controller is further configured to modulate the first control signal and the second control signal according to a signal fed back by the feedback module, so as to adjust a signal output by the adjustable gain power amplifier to a reference amplitude and frequency.

Optionally, the feedback module includes: an attenuator and an analog-to-digital converter, ADC, wherein:

the attenuator is respectively electrically connected with the adjustable gain power amplifier and the ADC and is used for receiving the signal output by the adjustable gain power amplifier and attenuating the signal into a small sine wave signal with a preset amplitude;

and the ADC is electrically connected with the controller and is used for converting the sine wave small signal provided by the attenuator into a digital signal and providing the digital signal to the controller.

Optionally, the method further includes: a digital-to-analog converter, DAC, wherein:

the controller is electrically connected with the DAC and used for sending a first control signal to the DAC;

and the DAC is electrically connected with the adjustable gain power amplifier and used for converting the first control signal into a small sine wave signal and providing the small sine wave signal to the adjustable gain power amplifier.

Optionally, the method further includes: a temperature sensor disposed about the adjustable gain power amplifier, wherein:

the controller is used for receiving the working temperature of the adjustable gain power amplifier sensed by the temperature sensor; and if the working temperature exceeds a preset temperature threshold value, stopping sending the first control signal, otherwise, continuously sending the first control signal.

Optionally, the method further includes: a power supply with adjustable output voltage, wherein:

the controller is electrically connected with the power supply with the adjustable output voltage and is used for sending a second control signal to the power supply with the adjustable output voltage;

and the power supply of the adjustable output voltage is electrically connected with the adjustable gain power amplifier and used for controlling the voltage value output to the adjustable gain power amplifier based on the second control signal so as to control the output power of the adjustable gain power amplifier.

Optionally, the controller is further configured to send a second control signal to the adjustable gain power amplifier.

The embodiment of this specification still provides a security inspection door, its characterized in that includes: such as the transmit circuit and the receive circuit described above.

Optionally, the receiving circuit sequentially includes, along the energy transmission direction: the device comprises a receiving coil, a first-stage amplifying circuit, a full-wave rectifying circuit, an integrating circuit, a second-stage operational amplifier, a third-stage operational amplifier and an ADC.

Optionally, the method further includes: vibration sensor, vibration sensor set up in the door body of security installations door, wherein:

the controller is also used for reading vibration data sensed by the vibration sensor when detecting the change of the metal detection signal; and if the security inspection door is judged to vibrate based on the vibration data, the change of the metal detection signal is ignored, otherwise, the metal is judged to be detected.

Optionally, the vibration sensor has a plurality ofly, and all install at least one vibration sensor on each door plant of safety inspection door, wherein:

the controller is also used for reading vibration data sensed by the vibration sensors arranged on the door panels; determining the posture of the security door based on the vibration data; and if the posture of the security inspection door is in an inclined state and the inclination angle is larger than a preset angle threshold value, sending out prompt information through a prompt device.

One embodiment of the present specification realizes that a feedback module feeds back a signal output by an adjustable gain power amplifier to a controller, and the controller adaptively modulates a control signal sent to the adjustable gain power amplifier according to the feedback signal, so that the adjustable gain power amplifier is applicable to amplification of multiple frequency points.

Drawings

The accompanying drawings, which are included to provide a further understanding of the specification and are incorporated in and constitute a part of this specification, illustrate embodiments of the specification and together with the description serve to explain the specification and not to limit the specification in a non-limiting sense. In the drawings:

fig. 1 is a schematic structural diagram of a transmitting circuit according to an embodiment of the present disclosure;

fig. 2 is a schematic structural diagram of a transmitting circuit according to another embodiment of the present disclosure;

fig. 3 is a schematic diagram of a software control flow of a controller according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a security inspection door provided in an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a receiving circuit according to an embodiment of the present disclosure;

FIG. 6 is a schematic diagram of a connection between a controller and a vibration sensor provided in one embodiment of the present disclosure;

fig. 7 is a schematic flow chart of a method for resisting vibration interference according to an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of a security inspection door according to another embodiment of the present disclosure.

Detailed Description

In order to make the objects, technical solutions and advantages of the present disclosure more clear, the technical solutions of the present disclosure will be clearly and completely described below with reference to the specific embodiments of the present disclosure and the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present disclosure, and not all embodiments. All other embodiments obtained by a person skilled in the art without making any inventive step based on the embodiments in this description belong to the protection scope of this document.

The technical solutions provided by the embodiments of the present description are described in detail below with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of a transmitting circuit provided in an embodiment of the present specification, and referring to fig. 1, the transmitting circuit may include: controller, adjustable gain power amplifier, feedback module and transmitting coil, wherein:

wherein the controller is further configured to generate a first control signal and a second control signal, which correspond to control signals 1 and 2 in fig. 1, respectively.

The transmit circuit is further described below with reference to fig. 2:

the feedback module may specifically include: an attenuator and an analog-to-digital converter, ADC, wherein:

The transmission circuit further includes: a digital-to-analog converter, DAC, wherein:

The transmission circuit further includes: a temperature sensor disposed about the adjustable gain power amplifier, wherein:

Therefore, the temperature sensor is arranged around the adjustable gain power amplifier to sense the working temperature of the adjustable gain power amplifier and perform corresponding operation, so that the situation that the circuit is burnt out due to over-temperature is avoided.

The controller may provide a control signal to the adjustable gain power amplifier in a manner that:

the transmission circuit further includes: a power supply with adjustable output voltage, wherein:

the controller is electrically connected with the power supply with the adjustable output voltage, and is used for sending a second control signal to the power supply with the adjustable output voltage, and the second control signal is recorded as a control signal 2;

The method can also comprise the following steps: and directly sending a second control signal to the adjustable gain power amplifier by the controller, wherein in order to distinguish the second control signal sent to the power supply with the adjustable output voltage by the controller through the power supply, the second control signal directly sent to the power supply with the adjustable output voltage by the controller is marked as a control signal 3.

Based on this, the present embodiment provides a scheme for directly adjusting the output power of the adjustable gain power amplifier or adjusting the output power of the adjustable gain power amplifier by adjusting the voltage of the working power supply, so that the gain of the amplifier can be automatically adjusted, thereby implementing automatic control of the output power; in addition, the embodiment adopts a technology of converting the control signal into the power signal, and a closed-loop control technology is performed after the signal attenuation and detection are performed, so that the frequency and the signal stability of the transmission signal can be improved.

The following describes the implementation principle in detail with reference to fig. 3:

first, each component in the transmission circuit is briefly explained:

the controller is the core part of the whole transmitting circuit and is mainly responsible for sending a control signal 1 (a first control signal), a control signal 2 and a control signal 3, acquiring signals sent by the ADC through a digital signal path and acquiring temperature data sent by the temperature sensor through I2C. The DAC can convert the signal transmitted by the control signal 1 into a small sine wave signal and send the small sine wave signal to the adjustable gain power amplifier. The power supply with adjustable output voltage can control the output voltage value thereof through the control signal 2, thereby adjusting the output power of the power amplifier. The control signal 3 can control the amplification increase of the adjustable gain power amplifier, and amplifies the sine wave small signal to obtain a high-voltage and high-current transmitting signal for driving the transmitting coil. The attenuator can receive the high-voltage signal at the transmitting end back, attenuate the high-voltage signal into a small sine wave signal and provide the small sine wave signal to the ADC. The ADC can convert the signal sent by the attenuator into a digital signal and send the digital signal to the controller for processing. The temperature sensor is arranged near the adjustable gain amplifier, detects the working temperature of the adjustable gain amplifier and feeds back the working temperature to the controller through an I2C bus for processing.

Accordingly, the software control flow of the controller may specifically include the following steps:

step 302, control starts;

step 304, sending control signals 1 and 2;

step 306, receiving the digital signal:

step 308, whether the frequency and amplitude are accurate;

if yes, go to step 310, otherwise go back to step 304;

step 310, reading temperature data of a temperature sensor;

step 312, judging whether the temperature is within the range;

if yes, go to step 314, otherwise go to step 316;

step 314, continuously outputting a control signal 1;

and step 316, stopping outputting the control signal 1.

Specifically, the method comprises the following steps: the controller outputs control signals 1 and 2, the DAC and the amplifier work at the moment, the power signal is output to the transmitting coil, then the attenuator attenuates the high-voltage signal, the ADC acquires the high-voltage signal and outputs a digital signal to the controller, the controller acquires the signal, and if the signal frequency meets the requirement, the control signals 1 and 2 are continuously output. If the signal frequency is not satisfactory, an adjustment is made. Then, the temperature is detected, and if the temperature is not within the range, the output of the control signal 1 is stopped. If the temperature is within the range, the control signal 1 is continuously output.

Therefore, in this embodiment, the feedback module feeds back the signal output by the adjustable gain power amplifier to the controller, and the controller adaptively modulates the control signal sent to the adjustable gain power amplifier according to the feedback signal, so that the adjustable gain power amplifier is applicable to amplification of multiple frequency points.

Fig. 4 is a schematic structural diagram of a security door provided in an embodiment of the present disclosure, and referring to fig. 4, the security door includes: the transmitting circuit and the receiving circuit as described in the previous embodiment.

Referring to fig. 5, the structural schematic diagram of the receiving circuit sequentially includes, along the energy transmission direction: the device comprises a receiving coil, a first-stage amplifying circuit, a full-wave rectifying circuit, an integrating circuit, a second-stage operational amplifier, a third-stage operational amplifier and an ADC.

The full-wave rectifying circuit is a circuit capable of converting alternating current into current in a single direction, and is formed by combining at least two rectifiers, wherein one rectifier is responsible for a positive direction and the other rectifier is responsible for a negative direction, and the most typical full-wave rectifying circuit is a rectifying bridge consisting of four diodes and is generally used for rectifying power. Can also be built by MOS tube; the integrating circuit is mainly used for occasions such as waveform transformation, elimination of offset voltage of the amplifying circuit, integral compensation in feedback control and the like; an operational amplifier (OPA) is a short name for an operational amplifier, and is an amplification circuit that can mathematically operate on a signal.

Therefore, the receiving circuit provided by the embodiment adopts the full-wave rectifying circuit to extract the effective information, can extract the effective information to the maximum extent, can automatically extract the information, and saves the BC signal.

Optionally, the method further includes: the vibration sensor is arranged in the door body of the security inspection door, referring to fig. 6, 1 vibration sensor can be installed in the door body of the security inspection door, and the sensor is connected with the controller and used for detecting whether the environment where the security inspection door is located vibrates.

The controller is further used for reading vibration data sensed by the vibration sensor when the change of the metal detection signal is detected; and if the security inspection door is judged to vibrate based on the vibration data, the change of the metal detection signal is ignored, otherwise, the metal is judged to be detected.

Referring to fig. 7, the flow of the vibration disturbance resisting method based on the vibration sensor is as follows:

step 702, detecting the change of a metal detection signal by a controller;

step 704, reading data of the vibration sensor;

step 706, whether vibration occurs or not;

if yes, go to step 708, otherwise return to step 702;

step 708, detecting metal and performing control such as alarm;

and step 710, controlling to alarm.

Specifically, the method comprises the following steps: when the controller detects the change of the metal detection signal, the controller judges whether metal passes or a signal generated by vibration is possible, and the second step is to read the data of the vibration sensor, judge whether vibration occurs or not, judge whether environmental interference occurs or not if vibration occurs, filter the environmental interference and continue to detect the signal; if no vibration is fed back by the vibration sensor, the metal is judged to be detected, and an alarm is controlled to give an alarm.

Further, when the vibration sensor continuously feeds back the environmental vibration, the display device and the voice device on the security inspection door send out prompt information to prompt security personnel that the environment where the security inspection door is located is unstable, the metal detection data may be inaccurate, and an emergency plan should be taken.

In another possible embodiment, there are a plurality of the vibration sensors, and each door plate of the security inspection door is provided with at least one vibration sensor, wherein:

With reference to fig. 8, a vibration sensor is respectively installed on the left door panel and the right door panel of the security inspection door, both the two sensors can feed back data, and by comparing the data of the two sensors, if the data in the vertical direction are the same, the posture of the security inspection door is kept vertical, and the security inspection door works normally; if the data in the vertical direction are different, the situation that the posture of the security door is not vertical can be shown, the security door can be toppled over, damaged or hit a pedestrian, prompt information can be sent out through the display device and the voice device, security personnel can be prompted to check the posture of the security door, and the posture of the security door can be adjusted and made to be vertical.

Therefore, on one hand, the security door provided by the embodiment senses the vibration caused by the environmental interference by introducing the vibration sensor and filters the environmental interference; on the other hand, a vibration sensor is used for sensing whether the working environment of the security inspection door is stable or not and actively sending out a prompt when the working environment of the security inspection door is unstable; in another aspect, the vibration sensor senses the posture of the security door and actively gives a prompt when the security door tends to topple.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.

The foregoing description has been directed to specific embodiments of this disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing may also be possible or may be advantageous.

As will be appreciated by one skilled in the art, embodiments of the present description may be provided as a method, system, or computer program product. Accordingly, the description may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the description may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The description has been presented with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the description. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). Memory is an example of a computer-readable medium.

Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The above description is only an example of the present specification, and is not intended to limit the present specification. Various modifications and alterations to this description will become apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present specification should be included in the scope of the claims of the present specification.

Claims

1. A transmit circuit, comprising: controller, adjustable gain power amplifier, feedback module and transmitting coil, wherein:

the controller is electrically connected with the adjustable gain power amplifier and used for outputting a first control signal and a second control signal to the adjustable gain power amplifier, and the second control signal is used for controlling the amplification factor of the adjustable gain power amplifier;

the feedback module is electrically connected with the adjustable gain power amplifier and used for receiving a signal output by the adjustable gain power amplifier;

the feedback module is also electrically connected with the controller and is used for outputting a feedback signal which triggers the controller to modulate the first control signal and the second control signal to the controller;

the controller is further configured to modulate the first control signal and the second control signal according to the feedback signal, so as to adjust the signal output by the adjustable gain power amplifier to a reference amplitude and frequency.

2. The transmit circuit of claim 1, wherein the feedback module comprises: an attenuator and an analog-to-digital converter, ADC, wherein:

3. The transmit circuit of claim 1, further comprising: a digital-to-analog converter, DAC, wherein:

4. The transmit circuit of claim 3, further comprising: a temperature sensor disposed about the adjustable gain power amplifier, wherein:

5. The transmit circuit of claim 1, further comprising: a power supply with adjustable output voltage, wherein:

6. The transmit circuit of claim 1,

the controller is further configured to send a second control signal to the adjustable gain power amplifier.

7. A security door, comprising: the transmit and receive circuitry of any of claims 1 to 6.

8. The security door of claim 7, wherein the receiving circuit comprises, in order along the energy transmission direction: the device comprises a receiving coil, a first-stage amplifying circuit, a full-wave rectifying circuit, an integrating circuit, a second-stage operational amplifier, a third-stage operational amplifier and an ADC.

9. The security door of claim 7, further comprising: vibration sensor, vibration sensor set up in the door body of security installations door, wherein:

10. The security door of claim 9, wherein there are a plurality of vibration sensors, and at least one vibration sensor is mounted on each door panel of the security door, wherein: