CN116502667B - Radio frequency wake-up circuit and camera system - Google Patents

Radio frequency wake-up circuit and camera system Download PDF

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Publication number
CN116502667B
CN116502667B CN202310744374.3A CN202310744374A CN116502667B CN 116502667 B CN116502667 B CN 116502667B CN 202310744374 A CN202310744374 A CN 202310744374A CN 116502667 B CN116502667 B CN 116502667B
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CN
China
Prior art keywords
signal
switching tube
wake
circuit
radio frequency
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202310744374.3A
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Chinese (zh)
Other versions
CN116502667A (en
Inventor
许孝晨
秦自臻
王聪睿
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hangzhou Hikvision Digital Technology Co Ltd
Original Assignee
Hangzhou Hikvision Digital Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hangzhou Hikvision Digital Technology Co Ltd filed Critical Hangzhou Hikvision Digital Technology Co Ltd
Priority to CN202310744374.3A priority Critical patent/CN116502667B/en
Priority to CN202311459275.7A priority patent/CN117615230A/en
Publication of CN116502667A publication Critical patent/CN116502667A/en
Application granted granted Critical
Publication of CN116502667B publication Critical patent/CN116502667B/en
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Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/0701—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips at least one of the integrated circuit chips comprising an arrangement for power management
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
    • G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
    • G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
    • G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
    • G06K19/077—Constructional details, e.g. mounting of circuits in the carrier
    • G06K19/07749—Constructional details, e.g. mounting of circuits in the carrier the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
    • G06K19/07773—Antenna details
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/51—Housings
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Abstract

The application provides a radio frequency wake-up circuit and a camera system. The radio frequency wake-up circuit comprises a power supply end, a signal receiving circuit, a signal amplifying circuit and a signal transmitting circuit. The power end is used for being connected with a power supply. The signal receiving circuit is connected with the power end and is used for receiving the wake-up signal. The signal amplifying circuit is connected with the signal receiving circuit and the power end and is used for receiving the wake-up signal and amplifying the wake-up signal. The signal transmitting circuit is connected with the signal amplifying circuit and the transmitting antenna and is used for receiving the amplified wake-up signal, transmitting the amplified wake-up signal to the transmitting antenna and transmitting the wake-up signal to the electronic tag through the transmitting antenna. The application can wake up the electronic tag after receiving the wake-up signal, can solve the problem of too fast power consumption of the electronic tag, has simple circuit structure and lower cost, and is convenient for maintenance.

Description

Radio frequency wake-up circuit and camera system
Technical Field
The present application relates to the field of communications technologies, and in particular, to a radio frequency wake-up circuit and a camera system.
Background
The radio frequency identification technology has the advantages of high transmission data rate, long communication distance, high reliability and the like, and the performance of the radio frequency identification technology exceeds that of identification technologies such as bar codes, IC cards and the like. The radio frequency identification technology is divided into an active technology and a passive technology, wherein the active technology is more prominent, so that the radio frequency identification technology is widely applied to the fields of highway charging, warehouse management and intelligent transportation, and has a wide application prospect. In the related art, the electronic tag has the problem of too fast power consumption.
Disclosure of Invention
The application provides a radio frequency wake-up circuit and a camera system, which can solve the problem of too fast power consumption of an electronic tag.
The application provides a radio frequency wake-up circuit, comprising:
the power end is used for being connected with a power supply;
the signal receiving circuit is connected with the power supply end and is used for receiving a wake-up signal;
the signal amplifying circuit is connected with the signal receiving circuit and the power supply end and is used for receiving the wake-up signal and amplifying the wake-up signal; a kind of electronic device with high-pressure air-conditioning system
And the signal transmitting circuit is connected with the signal amplifying circuit and the transmitting antenna and is used for receiving the amplified wake-up signal, transmitting the amplified wake-up signal to the transmitting antenna and transmitting the wake-up signal to the electronic tag through the transmitting antenna.
Optionally, the signal receiving circuit includes a signal receiving end and a first switching tube connected with the signal receiving end, and the first switching tube is connected with the power end and the ground end; the first switching tube receives the wake-up signal through the signal receiving end, and the on-off of the first switching tube is controlled by the wake-up signal.
Optionally, the signal receiving circuit further includes a first resistor, and the first resistor is connected between the signal receiving end and the first end of the first switching tube.
Optionally, the signal receiving circuit further includes a second resistor, and the second resistor is connected between the power supply terminal and the second terminal of the first switching tube.
Optionally, the signal receiving circuit further includes a third resistor, and the third resistor is connected between the first end and the second end of the first switching tube.
Optionally, the signal receiving circuit further includes a fourth resistor, and the fourth resistor is connected between the first end of the first switching tube and the ground end.
Optionally, the signal receiving circuit further includes a first capacitor, and the first capacitor is connected between the first end of the first switch tube and the ground end.
Optionally, the first switching tube is an NPN triode.
Optionally, the signal amplifying circuit includes a second switching tube and a third switching tube, the second switching tube is connected with the first switching tube and the power end, the third switching tube is connected with the first switching tube and the grounding end, and the on-off of the second switching tube and the third switching tube is controlled by the on-off of the first switching tube.
Optionally, the signal amplifying circuit further includes a fifth resistor, and the fifth resistor is connected between the second end of the first switching tube and the first end of the second switching tube; and the second end of the third switch tube is connected with the first end of the first switch tube.
Optionally, the signal amplifying circuit further includes a sixth resistor and a seventh resistor, where the sixth resistor and the seventh resistor are connected between the second end of the second switching tube and the second end of the third switching tube.
Optionally, the second switching tube is an NPN triode.
Optionally, the third switching tube is a PNP triode.
Optionally, the signal transmitting circuit further includes a connector, where the connector includes a first connection end, a second connection end, a first test point and a second test point, the first connection end is connected with the second switching tube and the third switching tube, and the second connection end is connected with a ground end; the first test point and the second test point are connected with the transmitting antenna.
Optionally, the signal transmitting circuit further includes a second capacitor connected between the second connection terminal and the ground terminal.
Optionally, the signal transmitting circuit further includes a third capacitor connected between the second connection terminal and the ground terminal.
Optionally, the signal transmitting circuit further comprises a connector; the radio frequency wake-up circuit is integrated on a radio frequency circuit board, and the radio frequency circuit board is connected with the transmitting antenna in a plugging manner through the connector.
The radio frequency wake-up circuit further comprises a fourth capacitor connected between the power supply end and the grounding end.
The present application also provides an image pickup system including:
a housing assembly;
the lens module is assembled on the shell component;
the main circuit board is assembled on the shell component;
the radio frequency circuit board is assembled on the shell component and is connected with the main circuit board in an inserting way; the radio frequency circuit board is internally provided with the radio frequency wake-up circuit according to any one of the above embodiments; a kind of electronic device with high-pressure air-conditioning system
The antenna assembly comprises an antenna bracket and a transmitting antenna assembled on the antenna bracket, wherein the antenna bracket is assembled on the shell assembly, and the transmitting antenna is connected with the radio frequency circuit board in a plugging manner.
Optionally, the camera system further comprises a first electric plug connector and a second electric plug connector, and the main circuit board is in plug connection with the radio frequency circuit board through plug connection of the first electric plug connector and the second electric plug connector.
Optionally, the camera system further comprises a third electrical connector, through which the radio frequency circuit board is plug-connected to the transmitting antenna.
Optionally, the camera system further comprises at least one support member, and the radio frequency circuit board is supported above the main circuit board through the at least one support member.
Optionally, the chassis assembly includes a bottom case and an upper cover covering the top of the bottom case, the bottom case and the upper cover are assembled to form a containing cavity, and the lens module, the antenna assembly, the radio frequency circuit board and the main circuit board are assembled in the containing cavity;
optionally, the bottom shell and the upper cover are assembled by a fixing piece, and a projection area of the fixing piece, which is arranged on the bottom shell, is staggered with a projection area of the radio frequency circuit board on the bottom shell.
Optionally, the transmitting antenna is attached to one surface of the antenna support, which faces the central axis of the accommodating cavity, by a laser technology.
Optionally, the projection area of the lens module on the bottom shell is staggered with the projection area of the radio frequency circuit board on the bottom shell.
Optionally, the lens module includes a lens holder and a lens assembled on the lens holder, and the antenna holder is assembled on a peripheral side of the lens holder.
Optionally, the upper cover is made of plastic.
Optionally, the antenna support is made of plastic.
The radio frequency wake-up circuit and the camera system provided by the embodiment of the application are characterized in that the radio frequency wake-up circuit is provided with a signal receiving circuit, a signal amplifying circuit and a signal transmitting circuit, the signal receiving circuit is used for receiving the wake-up signal, the signal amplifying circuit is used for receiving the wake-up signal and amplifying the wake-up signal, then the signal transmitting circuit is used for receiving the amplified wake-up signal, the amplified wake-up signal is transmitted to a transmitting antenna, and the electronic tag is transmitted with the wake-up signal through the transmitting antenna. The electronic tag can be awakened after the awakening signal is received, the problem that the electronic tag is too fast in power consumption can be solved, the circuit structure is simple, the cost is low, and the maintenance is convenient.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic diagram showing the configuration of an embodiment of an imaging system of the present application.
Fig. 2 is an exploded view of the camera system shown in fig. 1.
Fig. 3 is a schematic diagram showing a part of the structure of the image capturing system shown in fig. 1.
Fig. 4 is a schematic diagram showing a part of the structure of the image pickup system shown in fig. 1.
Fig. 5 is a schematic structural diagram of a view angle of the radio frequency circuit board of the camera system shown in fig. 1.
Fig. 6 is a schematic structural diagram of another view of the radio frequency circuit board of the camera system shown in fig. 5.
Fig. 7 is a schematic structural diagram of a further view of the radio frequency circuit board of the camera system shown in fig. 5.
Fig. 8 is a functional block diagram of one embodiment of a radio frequency wake-up circuit of the present application.
Fig. 9 is a circuit diagram of the radio frequency wake-up circuit shown in fig. 8.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the application. Rather, they are merely examples of apparatus and methods consistent with aspects of the application as detailed in the accompanying claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The terms "first," "second," and the like in the description and in the claims, are not used for any order, quantity, or importance, but are used for distinguishing between different elements. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. "plurality" or "plurality" means two or more. Unless otherwise indicated, the terms "front," "rear," "lower," and/or "upper" and the like are merely for convenience of description and are not limited to one location or one spatial orientation. The word "comprising" or "comprises", and the like, means that elements or items appearing before "comprising" or "comprising" are encompassed by the element or item recited after "comprising" or "comprising" and equivalents thereof, and that other elements or items are not excluded. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any or all possible combinations of one or more of the associated listed items.
The application provides a radio frequency wake-up circuit and a camera system. The radio frequency wake-up circuit comprises a power supply end, a signal receiving circuit, a signal amplifying circuit and a signal transmitting circuit. The power end is used for being connected with a power supply. The signal receiving circuit is connected with the power end and is used for receiving the wake-up signal. The signal amplifying circuit is connected with the signal receiving circuit and the power end and is used for receiving the wake-up signal and amplifying the wake-up signal. The signal transmitting circuit is connected with the signal amplifying circuit and the transmitting antenna and is used for receiving the amplified wake-up signal, transmitting the amplified wake-up signal to the transmitting antenna and transmitting the wake-up signal to the electronic tag through the transmitting antenna.
The radio frequency wake-up circuit and the camera system provided by the embodiment of the application are characterized in that the radio frequency wake-up circuit is provided with a signal receiving circuit, a signal amplifying circuit and a signal transmitting circuit, the signal receiving circuit is used for receiving the wake-up signal, the signal amplifying circuit is used for receiving the wake-up signal and amplifying the wake-up signal, then the signal transmitting circuit is used for receiving the amplified wake-up signal, the amplified wake-up signal is transmitted to a transmitting antenna, and the electronic tag is transmitted with the wake-up signal through the transmitting antenna. The electronic tag can be awakened after the awakening signal is received, the problem that the electronic tag is too fast in power consumption can be solved, the circuit structure is simple, the cost is low, and the maintenance is convenient.
The application provides a radio frequency wake-up circuit and a camera system, which can solve the problem of too fast power consumption of an electronic tag. The radio frequency wake-up circuit and the camera system of the present application will be described in detail with reference to the accompanying drawings. The features of the examples and embodiments described below may be combined with each other without conflict.
Fig. 1 is a schematic diagram showing the configuration of an embodiment of an imaging system 1 of the present application. Fig. 2 shows an exploded view of the imaging system 1 shown in fig. 1. Fig. 3 is a schematic diagram showing a part of the configuration of the image pickup system 1 shown in fig. 1. Fig. 4 is a schematic diagram showing a part of the configuration of the image pickup system 1 shown in fig. 1. Fig. 5 is a schematic structural diagram of a view angle of the radio frequency circuit board of the camera system 1 shown in fig. 1. Fig. 6 is a schematic structural diagram of another view of the radio frequency circuit board of the camera system 1 shown in fig. 5. Fig. 7 is a schematic structural diagram of a further view of the radio frequency circuit board of the camera system 1 shown in fig. 5. As shown in connection with fig. 1 to 7, the image pickup system 1 may be a security monitoring image pickup system. The camera system 1 includes a housing assembly 11, a lens module 12, a main circuit board 13, a radio frequency circuit board 14, and an antenna assembly 15. The lens module 12 is assembled to the housing assembly 11. The main circuit board 13 is assembled to the housing assembly 11. The radio frequency circuit board 14 is assembled on the housing assembly 11 and is connected with the main circuit board 13 in a plugging manner. The housing assembly 11 is used for accommodating the lens module 12, the main circuit board 13, the radio frequency circuit board 14 and the antenna assembly 15. The lens module 12 includes a lens holder 121 and a lens assembly 122 disposed on the lens holder 121. The lens holder 121 is used for fixing the lens assembly 122, and the lens assembly 122 is used for capturing images. The main circuit board 13 is also used for connecting with the lens assembly 122 and controlling and driving the lens assembly 122 to work. The antenna assembly 15 includes an antenna bracket 151 and a transmitting antenna 152 assembled on the antenna bracket 151, the antenna bracket 151 is assembled on the housing assembly 11, and the transmitting antenna 152 is connected with the radio frequency circuit board 14 in a plugging manner. In the above scheme, the camera system 1 is provided with the radio frequency circuit board 14, and the radio frequency circuit board 14 is provided with the wake-up circuit 2, so that the electronic tag can be wake-up after receiving the wake-up signal, the problem of too fast power consumption of the electronic tag can be solved, the radio frequency technology can be applied to the camera system 1, the camera system 1 can wake-up the other equipment (generally the electronic tag) through the radio frequency wake-up circuit in the radio frequency circuit board 14, then data communication and photographing and shooting are completed, the functions of the camera system 1 are enriched, and the application scene of the camera system 1 is increased.
In the embodiment shown in fig. 2 to 3, the housing assembly 11 includes a bottom case 111 and an upper cover 112 disposed above the bottom case 111, the bottom case 111 and the upper cover 112 are assembled to form a housing cavity 113, and the lens module 12, the antenna assembly 15, the radio frequency circuit board 14 and the main circuit board 13 are assembled in the housing cavity 113. In the present embodiment, the lens module 12 includes a lens holder 121 and a lens assembly 122 assembled to the lens holder 121, and the antenna holder 151 is assembled to a peripheral side of the lens holder 121. When the imaging system 1 is assembled, the main circuit board 13 is first assembled in the bottom case 111, and then the radio frequency circuit board 14 is assembled above the main circuit board 13 and is connected with the main circuit board 13 in a plugging manner. Then, the lens holder 121 is assembled to the edge of the bottom case 111, the lens assembly 122 is assembled to the lens holder 121, then, the antenna holder 151 with the transmitting antenna 152 is assembled to the bottom case 111, the antenna holder 151 is assembled to the peripheral side of the lens holder 121, and finally, the upper cover 112 is assembled to the top of the bottom case 111. In the present embodiment, the lens module 12, the antenna assembly 15, the rf circuit board 14 and the main circuit board 13 are fixed in the housing assembly 11 by the fixing member 114. The assembly mode is simple and has good stability.
In the embodiment shown in fig. 2, the bottom case 111 and the upper cover 112 are assembled by a fixing member 114, which may be a fixing member such as a bolt or a latch, and the fixing stability is good. In the embodiment shown in fig. 2, the upper cover 112 is made of plastic. The projection area of the fixing member 114 disposed on the bottom case 111 is staggered from the projection area of the rf circuit board 14 on the bottom case 111, so that the fixing member 114 cannot be located in the vertical projection area of the rf circuit board 14, and metal shielding is avoided, thereby affecting the antenna performance. In the embodiment shown in fig. 2, the projection area of the lens module 12 on the bottom shell 111 is offset from the projection area of the rf circuit board 14 on the bottom shell 111. By the arrangement, the lens module 12 is prevented from overlapping with the vertical projection area of the radio frequency circuit board 14, and signal interference and performance influence are avoided.
In the embodiment shown in fig. 2, the transmitting antenna 152 is disposed on a side of the antenna mount 151 facing the central axis of the housing cavity 113, such as the a-side shown in fig. 2. In the embodiment shown in fig. 2, the transmitting antenna 152 is attached to a side of the antenna mount 151 facing the central axis of the housing cavity 113 by laser technology. The antenna bracket 151 is made of plastic. The antenna is attached to the surface of the antenna stand 151 made of plastic material by an LDS technology (Laser-Direct-structuring technology). So set up, make transmitting antenna 152 more stable, can avoid the interference of inside components and parts, also can save more simultaneously and establish the equipment space, make the structure compacter, small.
In the embodiment shown in fig. 4 to 7, the camera system 1 further comprises an electrical connector for making an electrical connection between the main circuit board 13 and the radio frequency circuit board 14, and between the radio frequency circuit board 14 and the transmitting antenna 152. In the embodiment shown in fig. 1 to 7, the electrical connectors comprise a first electrical connector 161 and a second electrical connector 162, the main circuit board 13 being in plug-in connection with the radio frequency circuit board 14 by means of a plug-in fit of the first electrical connector 161 with the second electrical connector 162.
In some embodiments, one of the first electrical connector 161 and the second electrical connector 162 is a receptacle and the other is a pin. In the embodiment shown in fig. 4, the first electrical connector 161 may be a socket. The second electrical connector 162 may be a pin. The socket is inserted into one side of the main circuit board 13, and the contact pin is inserted into one side of the radio frequency circuit board 14. The main circuit board 13 is in plug-in connection with the radio frequency circuit board 14 through the socket and the pin. The socket is connected with the contact pin in a plugging manner, so that the assembly mode is simple, the electric connection is stable, and the transmission signal is stable and reliable. In other embodiments, the first electrical connector 161 is a pin. The second electrical connector 162 may be a socket. In other embodiments, the first electrical connector 161 and the second electrical connector 162 may be other electrical connectors.
In the embodiment shown in fig. 4, the electrical connectors further comprise a third electrical connector 163, by means of which third electrical connector 163 the radio frequency circuit board 14 is plug-connected to the transmitting antenna 152. In this embodiment, the third connector 163 may be a latch. The radio frequency circuit board 14 is connected with the transmitting antenna 152 in a plug-in connection through a spring pin. The spring needle is connected with the transmitting antenna 152, so that the assembly mode is simple, the electric connection is stable, and the transmission signal is stable and reliable. In other embodiments, the third electrical connector 163 may also be other electrical connectors.
In the embodiment shown in fig. 4, the camera system 1 further comprises at least one support 17, and the radio frequency circuit board 14 is supported above the main circuit board 13 by the at least one support 17. The supporting piece 17 plays a role in fixing, so that a gap is formed between the radio frequency circuit board 14 and the main circuit board 13, the radio frequency circuit board 14 is prevented from being contacted with the main circuit board 13, and the heat dissipation requirement can be met. In the present embodiment, the supporting member 17 may be a supporting member such as a bolt or a fixing pin, and is not limited in the present application.
The radio frequency circuit board 14 is provided with a radio frequency wake-up circuit 2 as shown in the embodiment of fig. 8 and 9. The radio frequency wake-up circuit 2 is integrated in the radio frequency circuit board 14. The radio frequency wake-up circuit 2 can wake up the electronic tag after receiving the wake-up signal, and can solve the problem of too fast power consumption of the electronic tag. See in particular figures 8 and 9 below.
Fig. 8 is a functional block diagram of one embodiment of the radio frequency wake-up circuit 2 of the present application. As shown in fig. 8, the radio frequency wake-up circuit 2 includes a power source terminal 201, a signal receiving circuit 202, a signal amplifying circuit 203 and a signal transmitting circuit 204. The power terminal 201 is for connection to a power source. The power source may be a direct current power source. The power supply voltage of the dc power supply was 5V. The signal receiving circuit 202 is connected to the power terminal 201 and is configured to receive a wake-up signal. The signal amplifying circuit 203 is connected to the signal receiving circuit 202 and the power supply terminal 201, and is configured to receive the wake-up signal and amplify the wake-up signal. The signal transmitting circuit 204 is connected to the signal amplifying circuit 203 and the transmitting antenna 152, and is configured to receive the amplified wake-up signal, transmit the amplified wake-up signal to the transmitting antenna 152, and transmit the wake-up signal to the electronic tag 3 through the transmitting antenna 152.
The wake-up signal of the above scheme may be a wake-up signal issued by the controller 18. The controller 18 is provided within the main circuit board 13 as shown in the embodiments of figures 1 to 7 above. In other embodiments, the wake-up signal may be an external electrical signal, not limiting in the present application. The radio frequency wake-up circuit 2 receives a wake-up signal by the signal receiving circuit 202, the signal amplifying circuit 203 and the signal transmitting circuit 204, receives the wake-up signal by the signal receiving circuit 202, amplifies the wake-up signal by the signal amplifying circuit 203, receives the amplified wake-up signal by the signal transmitting circuit 204, transmits the amplified wake-up signal to the transmitting antenna 152, and transmits the wake-up signal to the electronic tag 3 through the transmitting antenna 152. The electronic tag can be awakened after the awakening signal is received, the problem that the electronic tag is too fast in power consumption can be solved, the circuit structure is simple, the cost is low, and the maintenance is convenient.
Fig. 9 is a circuit diagram of the radio frequency wake-up circuit shown in fig. 8. As shown in fig. 8 and 9, the signal receiving circuit 202 includes a signal receiving terminal SHD and a first switching tube Q1 connected to the signal receiving terminal SHD, where the first switching tube Q1 is connected to the power source terminal 201 and the ground terminal GND; the first switching tube Q1 receives a wake-up signal through the signal receiving end SHD, and the on-off of the first switching tube Q1 is controlled by the wake-up signal. In this embodiment, the signal receiving terminal SHD is connected to the control terminal of the controller 18. The controller 18 outputs a wake-up signal through the control terminal to control the on-off of the first switching tube Q1.
In the embodiment shown in fig. 9, the first switching transistor Q1 is an NPN transistor. The signal receiving circuit 202 further includes a first resistor R1, and the first resistor R1 is connected between the signal receiving terminal SHD and the first terminal of the first switching tube Q1. In this embodiment, the first end of the first switching tube Q1 is a base. The first resistor R1 is connected between the signal receiving terminal SHD and the base of the first switching tube Q1. The first resistor R1 may be a current limiting resistor, and plays a role in current limiting. In the embodiment shown in fig. 9, the signal receiving circuit 202 further includes a second resistor R2, and the second resistor R2 is connected between the power supply terminal 201 and the second terminal of the first switching tube Q1. In this embodiment, the second end of the first switching tube Q1 is a collector. The second resistor R2 is connected between the power supply terminal 201 and the collector of the first switching tube Q1. The second resistor R2 may be a pull-up resistor, which stabilizes the second terminal of the first switching tube Q1 to the stabilized voltage of the power supply terminal 201. In the embodiment shown in fig. 9, the signal receiving circuit 202 further includes a third resistor R3, and the third resistor R3 is connected between the first end and the second end of the first switch tube Q1. In this embodiment, the first end of the first switching tube Q1 is a base, and the second end is a collector. The third resistor R3 is connected between the base and the collector of the first switching tube Q1. The third resistor R3 may be a bias resistor, which functions to provide a bias current. In the embodiment shown in fig. 9, the signal receiving circuit 202 further includes a fourth resistor R4, and the fourth resistor R4 is connected between the first end of the first switching tube Q1 and the ground GND. In this embodiment, the first end of the first switching tube Q1 is a base. The fourth resistor R4 is connected between the base of the first switching transistor Q1 and the ground GND. The fourth resistor R4 may be a pull-down resistor, which pulls the current of the base of the first switching tube Q1 down to the ground GND. In the embodiment shown in fig. 9, the signal receiving circuit 202 further includes a first capacitor C1, and the first capacitor C1 is connected between the first end of the first switch Q1 and the ground GND. In the present embodiment, the first capacitor C1 is connected between the fourth resistor R4 and the ground GND. The first capacitor C1 acts as a filter.
In the present embodiment, when the wake-up signal output from the controller 18 is a high-level signal, the received high-level signal acts on the first resistor R1 after passing through the first resistor R1, and a current input to the base of the first switching transistor Q1 is formed, so that the collector and emitter paths of the first switching transistor Q1 are formed. When the wake-up signal output from the controller 18 is a low level signal, the current input to the base of the first switching tube Q1 cannot be generated in the first resistor R1, and the collector and the emitter of the first switching tube Q1 are opened.
In the embodiment shown in fig. 9, the signal amplifying circuit 203 includes a second switching tube Q2 and a third switching tube Q3, the second switching tube Q2 is connected to the first switching tube Q1 and the power supply terminal 201, the third switching tube Q3 is connected to the first switching tube Q1 and the ground terminal GND, and the on-off of the second switching tube Q2 and the third switching tube Q3 is controlled by the on-off of the first switching tube Q1. In this embodiment, the on/off of the second switching tube Q2 and the third switching tube Q3 is controlled by the on/off of the first switching tube Q1.
In the embodiment shown in fig. 9, the second switching transistor Q2 is an NPN transistor. In the embodiment shown in fig. 9, the third switching transistor Q3 is a PNP transistor. The signal amplifying circuit 203 further includes a fifth resistor R5, where the fifth resistor R5 is connected between the second end of the first switching tube Q1 and the first end of the second switching tube Q2; and is connected between the second end of the first switching tube Q1 and the first end of the third switching tube Q3. In this embodiment, the second end of the first switching tube Q1 is a collector. The first end of the second switching tube Q2 is a base electrode. The first end of the third switching tube Q3 is a base electrode. The fifth resistor R5 is connected between the collector of the first switching tube Q1 and the base of the second switching tube Q2; and is connected between the collector of the first switching tube Q1 and the base of the third switching tube Q3. The fifth resistor R5 may be a current limiting resistor, and plays a role in current limiting.
In the embodiment shown in fig. 9, the signal amplifying circuit 203 further includes a sixth resistor R6 and a seventh resistor R7, where the sixth resistor R6 and the seventh resistor R7 are connected between the second end of the second switching tube Q2 and the second end of the third switching tube Q3. In this embodiment, the second end of the second switching tube Q2 is an emitter. The second end of the third switching tube Q3 is an emitter. The sixth resistor R6 and the seventh resistor R7 are connected between the emitter of the second switching tube Q2 and the emitter of the third switching tube Q3. The sixth resistor R6 and the seventh resistor R7 may be voltage dividing resistors.
In this embodiment, when the wake-up signal output by the controller 18 is a high level signal and the first switching tube Q1 is on, the fifth resistor R5 cannot generate the current input to the base of the second switching tube Q2 and the base of the third switching tube Q3, so that the emitter and collector of the second switching tube Q2 are open, and the emitter and collector of the third switching tube Q3 are on. At this time, the connection between the sixth resistor R6 and the seventh resistor R7 is at the low level of ground. In this embodiment, when the wake-up signal output by the controller 18 is a low level signal and the first switching tube Q1 is opened, the fifth resistor R5 generates current input to the base of the second switching tube Q2 and the base of the third switching tube Q3, so that the emitter and collector of the second switching tube Q2 are connected, and the emitter and collector of the third switching tube Q3 are opened. At this time, the connection between the sixth resistor R6 and the seventh resistor R7 is at a high level of the 5V power connected to the power supply terminal 201.
In the embodiment shown in fig. 9, the signal transmitting circuit 204 further includes a connector JP1, where the connector JP1 includes a first connection terminal IF1, a second connection terminal IF2, a first test point TP1, and a second test point TP2, the first connection terminal IF1 is connected to the second switching tube Q2 and the third switching tube Q3, and the second connection terminal IF2 is connected to the ground GND. The first test point TP1 and the second test point TP2 are connected to a transmitting antenna. In the embodiment shown in fig. 9, the signal transmitting circuit 204 further includes a second capacitor C2 connected between the second connection terminal IF2 and the ground terminal GND. In the embodiment shown in fig. 9, the signal transmitting circuit 204 further includes a third capacitor C3 connected between the second connection terminal IF2 and the ground terminal GND. In the present embodiment, the first connection terminal IF1 is connected to the connection between the sixth resistor R6 and the seventh resistor R7. The second connection terminal IF2 is connected to the ground terminal GND through the second capacitor C2 and the third capacitor C3. In the present embodiment, the radio frequency circuit board 14 and the transmitting antenna 152 are plug-connected by the connector JP 1. The connector JP1 may be a latch. In the embodiment shown in fig. 9, the radio frequency wake-up circuit further includes a fourth capacitor C4 connected between the power supply terminal 201 and the ground terminal GND. The fourth capacitor C4 acts as a filter.
In this embodiment, when the connection between the sixth resistor R6 and the seventh resistor R7 is at the high level of the 5V power supply, the current is connected from the first test point TP1 of the connector JP1 to the external transmitting antenna 152, and the current flows back to the second test point TP2 of the connector JP1 through the external transmitting antenna 152, at this time, the second capacitor C2 and the third capacitor C3 are charged, and the upper ends of the second capacitor C2 and the third capacitor C3 are positively charged. When the connection between the sixth resistor R6 and the seventh resistor R7 is at the low level of ground, the second capacitor C2 and the third capacitor C3, which are just fully charged, discharge, and current flows from the upper ends of the second capacitor C2 and the third capacitor C3 to the second test point TP2 of the connector JP1, the transmitting antenna 152 connected externally through the current flows back to the first test point TP1 of the connector JP1, and the current is conducted to the connection between the sixth resistor R6 and the seventh resistor R7 through the first test point TP1 of the connector JP1, and then to the ground through the emitter and the collector of the third switching tube Q3.
The radio frequency wake-up circuit 2 may be a low frequency wake-up circuit. By providing the signal receiving circuit 202, the signal amplifying circuit 203, and the signal transmitting circuit 204, the signal receiving circuit 202 receives the wake-up signal, the signal amplifying circuit 203 receives the wake-up signal, amplifies the wake-up signal, and then the signal transmitting circuit 204 receives the amplified wake-up signal, transmits the amplified wake-up signal to the transmitting antenna 152, and transmits the wake-up signal to the electronic tag 3 through the transmitting antenna 152. The electronic tag can be awakened after the awakening signal is received, the problem that the electronic tag is too fast in power consumption can be solved, the circuit structure is simple, the cost is low, and the maintenance is convenient. The low-frequency wake-up circuit can be applied to the camera system 1, so that the camera system can emit a low-frequency wake-up signal, the low-frequency wake-up function of the radio frequency tag is realized, and the functions of the camera system 1 are enriched. Meanwhile, the radio frequency wake-up circuit 2 can wake up the electronic tag 3 when communication with the electronic tag 3 is needed, so that the power consumption of the electronic tag 3 is reduced.
The camera system 1 of the present application may be a dome camera with an RFID module built in, and includes a housing assembly 11, a lens module 12, an RFID module, an antenna bracket 151, and a main circuit board 13. In this embodiment, the RFID component may be a transmitting antenna 152. The housing assembly 11 has a built-in cavity, which may be a receiving cavity 113. The lens module 12 includes a lens holder 121 and a lens assembly 122 supported by the lens holder 121 and capable of tilting, wherein the lens holder 121 includes an annular portion 1211 and two side walls 1212 extending longitudinally along the annular portion 1211 and disposed opposite to each other, the side walls 1212 support the lens assembly 122, and a circumferential edge of the annular portion 1211 has a radially concave notch 1213. The antenna bracket 151 includes a first arc-shaped portion 1511 extending horizontally and a second arc-shaped portion 1512 extending longitudinally, wherein the first arc-shaped portion 1511 has the same arc center as the housing assembly 11, and the arc length of the first arc-shaped portion 1511 is longer than the arc length of the opening 1213 of the annular portion 1211. The main circuit board 13 is disposed in the built-in cavity (housing cavity 113) and is opposed to the inner surface of the chassis assembly 11. An RFID module and an antenna mount 151 are disposed in sequence longitudinally in a longitudinal space defined by the slit 1213, wherein the RFID module is electrically connected to the main circuit board 13 via a pin, and the RFID module is electrically connected to the antenna mount 151 via a spring pin. The RFID assembly has a longitudinal height lower than the lens holder 121 and the antenna holder 151. Wherein the RFID component comprises a radio frequency wake-up circuit 2. In this embodiment, the RFID component is integrated as a radio frequency circuit board, in which a radio frequency wake-up circuit 2 is provided. The radio frequency wake-up circuit 2 is used for sending out radio frequency instruction signals so as to control the electronic tag 3 to be switched from a low-power consumption state to a working state.
In some embodiments, the main circuit board 13 of the camera is configured to trigger the radio frequency wake-up circuit 2 to send a radio frequency command signal after receiving a command that instructs the electronic tag 3 to switch to an operating state. In some embodiments, the radio frequency wake-up circuit 2 comprises a signal receiving unit, a signal amplifying unit, a signal transmitting unit and a power supply unit. The signal receiving unit may be the signal receiving circuit 202. The signal amplifying unit may be the signal amplifying circuit 203. The signal transmitting unit may be the signal transmitting circuit 204. In some embodiments, the signal receiving unit includes a signal receiving terminal SHD and a first switching tube Q1 connected to the signal receiving terminal SHD, where the first switching tube Q1 is connected to the power supply terminal 201 and the ground terminal GND. The first switching tube Q1 receives a wake-up signal through the signal receiving end SHD, and the on-off of the first switching tube Q1 is controlled by the wake-up signal.
In some embodiments, the signal receiving unit includes a first resistor R1, and the first resistor R1 is connected between the signal receiving terminal SHD and the first terminal of the first switching tube Q1. The signal receiving circuit includes a second resistor R2, and the second resistor R2 is connected between the power supply terminal 201 and the second terminal of the first switching tube Q1. The signal receiving circuit includes a third resistor R3, and the third resistor R3 is connected between the first end and the second end of the first switching tube Q1. The signal receiving circuit includes a fourth resistor R4, and the fourth resistor R4 is connected between the first end of the first switching tube Q1 and the ground GND. The signal receiving circuit includes a first capacitor C1, and the first capacitor C1 is connected between a first end of the first switch tube Q1 and the ground GND. The first switching tube Q1 is an NPN triode.
In some embodiments, the signal amplifying unit includes a second switching tube Q2 and a third switching tube Q3, where the second switching tube Q2 is connected to the first switching tube Q1 and the power supply end 201, and the third switching tube Q3 is connected to the first switching tube Q1 and the ground end GND, and the on-off of the second switching tube Q2 and the third switching tube Q3 is controlled by the on-off of the first switching tube Q1. In some embodiments, the signal amplifying unit includes a fifth resistor R5, where the fifth resistor R5 is connected between the second end of the first switching tube Q1 and the first end of the second switching tube Q2; and is connected between the second end of the first switching tube Q1 and the first end of the third switching tube Q3. In some embodiments, the signal amplifying circuit further includes a sixth resistor R6 and a seventh resistor R7, where the sixth resistor R6 and the seventh resistor R7 are connected between the second end of the second switching tube Q2 and the second end of the third switching tube Q3. The second switching transistor Q2 is an NPN transistor. The third switching tube Q3 is a PNP triode.
In some embodiments, the signal transmitting unit includes a connector JP1, where the connector JP1 includes a first connection terminal IF1, a second connection terminal IF2, a first test point TP1, and a second test point TP2, the first connection terminal IF1 is connected to the second switching tube Q2 and the third switching tube Q3, and the second connection terminal IF2 is connected to the ground GND. The first test point TP1 and the second test point TP2 are connected to a transmitting antenna. In some embodiments, the signal transmitting unit includes a second capacitor C2 connected between the second connection terminal IF2 and the ground terminal GND. In some embodiments, the signal transmitting unit includes a third capacitor C3 connected between the second connection terminal IF2 and the ground terminal GND. In some embodiments, the radio frequency wake-up circuit 2 is integrated in a radio frequency wake-up circuit board, which is plug-connected with the transmitting antenna via the connector JP 1.
In some embodiments, the radio frequency wake-up circuit 2 further includes a fourth capacitor C4 connected between the power supply terminal 201 and the ground terminal GND. In some embodiments, the power supply unit is composed of a 5V power supply and a fourth capacitor C4 connected to the power supply terminal 201.
Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims. It is to be understood that the application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (9)

1. A radio frequency wake-up circuit comprising:
the power end is used for being connected with a power supply;
the signal receiving circuit is connected with the power supply end and is used for receiving a wake-up signal;
the signal amplifying circuit is connected with the signal receiving circuit and the power supply end and is used for receiving the wake-up signal and amplifying the wake-up signal; a kind of electronic device with high-pressure air-conditioning system
The signal transmitting circuit is connected with the signal amplifying circuit and the transmitting antenna and is used for receiving the amplified wake-up signal, transmitting the amplified wake-up signal to the transmitting antenna and transmitting the wake-up signal to the electronic tag through the transmitting antenna;
the signal receiving circuit comprises a signal receiving end and a first switching tube connected with the signal receiving end, and the first switching tube is connected with the power end and the grounding end; the first switching tube receives the wake-up signal through the signal receiving end, and the on-off of the first switching tube is controlled by the wake-up signal; the signal amplifying circuit comprises a second switching tube and a third switching tube, the second switching tube is connected with the first switching tube and the power supply end, the third switching tube is connected with the first switching tube and the grounding end, and the on-off of the second switching tube and the third switching tube is controlled by the on-off of the first switching tube; the first switching tube is an NPN triode, the second switching tube is an NPN triode, and the third switching tube is a PNP triode;
the signal receiving circuit further comprises a first resistor and a second resistor, wherein the first resistor is connected between the signal receiving end and the first end of the first switching tube, and the second resistor is connected between the power end and the second end of the first switching tube;
the signal amplifying circuit further comprises a fifth resistor, wherein the fifth resistor is connected between the second end of the first switching tube and the first end of the second switching tube and between the second end of the first switching tube and the first end of the third switching tube.
2. The radio frequency wake-up circuit of claim 1, wherein the signal receiving circuit further comprises a third resistor connected between the first and second ends of the first switching tube; and/or
The signal receiving circuit further comprises a fourth resistor, and the fourth resistor is connected between the first end of the first switching tube and the grounding end; and/or
The signal receiving circuit further comprises a first capacitor, and the first capacitor is connected between the first end of the first switch tube and the grounding end.
3. The radio frequency wake-up circuit of claim 1, wherein the signal amplification circuit further comprises a sixth resistor and a seventh resistor connected between the second end of the second switching tube and the second end of the third switching tube.
4. The radio frequency wake-up circuit of claim 1, wherein the signal transmitting circuit further comprises a connector, the connector comprising a first connection terminal, a second connection terminal, a first test point and a second test point, the first connection terminal being connected to the second switching tube and the third switching tube, the second connection terminal being connected to a ground terminal; the first test point and the second test point are connected with the transmitting antenna.
5. The radio frequency wake-up circuit of claim 4, wherein the signal transmitting circuit further comprises a second capacitor connected between the second connection terminal and ground; and/or
The signal transmitting circuit further comprises a third capacitor connected between the second connection end and the grounding end.
6. The radio frequency wake-up circuit of claim 1, wherein the signal transmitting circuit further comprises a connector; the radio frequency wake-up circuit is integrated on a radio frequency circuit board, and the radio frequency circuit board is connected with the transmitting antenna in a plugging manner through the connector; and/or
The radio frequency wake-up circuit further comprises a fourth capacitor connected between the power supply end and the grounding end.
7. An image pickup system, comprising:
a housing assembly;
the lens module is assembled on the shell component;
the main circuit board is assembled on the shell component;
the radio frequency circuit board is assembled on the shell component and is connected with the main circuit board in an inserting way; a radio frequency wake-up circuit as claimed in any one of claims 1 to 6 is arranged in the radio frequency circuit board; a kind of electronic device with high-pressure air-conditioning system
The antenna assembly comprises an antenna bracket and a transmitting antenna assembled on the antenna bracket, wherein the antenna bracket is assembled on the shell assembly, and the transmitting antenna is connected with the radio frequency circuit board in a plugging manner.
8. The camera system of claim 7, further comprising a first electrical connector and a second electrical connector, the main circuit board being in mating connection with the radio frequency circuit board through the first electrical connector and the second electrical connector; and/or
The camera system further comprises a third electric plug connector, and the radio frequency circuit board is connected with the transmitting antenna in a plug connection mode through the third electric plug connector; and/or
The camera system further comprises at least one support member, and the radio frequency circuit board is supported above the main circuit board through the at least one support member.
9. The camera system of claim 8, wherein the housing assembly includes a bottom shell and an upper cover disposed over the bottom shell, the bottom shell and the upper cover assembled to form a receiving cavity, the lens module, the antenna assembly, the radio frequency circuit board, and the main circuit board being assembled in the receiving cavity;
the bottom shell and the upper cover are assembled through a fixing piece, and a projection area of the fixing piece, which is arranged on the bottom shell, is staggered with a projection area of the radio frequency circuit board, which is arranged on the bottom shell; and/or
Attaching the transmitting antenna to one surface of the antenna bracket facing the central shaft of the accommodating cavity through a laser technology; and/or
The projection area of the lens module on the bottom shell is staggered with the projection area of the radio frequency circuit board on the bottom shell; and/or
The lens module comprises a lens bracket and a lens assembled on the lens bracket, and the antenna bracket is assembled on the periphery of the lens bracket; and/or
The upper cover is made of plastic; and/or
The antenna bracket is made of plastic materials.
CN202310744374.3A 2023-06-21 2023-06-21 Radio frequency wake-up circuit and camera system Active CN116502667B (en)

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