CN206422925U - A kind of low-power consumption based on human body communication wakes up communicator - Google Patents

Abstract

The utility model realizes the device that low frequency signal by human body wake up being communicated, the utility model has used 15KHz 300KHz low frequency signals, and using human body as transmission medium to realize point-to-point wake-up and data exchange, device possesses ultra-low power consumption and low frequency signal transmitting and receiving circuit and low-power consumption bluetooth communication chip, low frequency transmission circuit is used for device wake and low volume data is exchanged, low-power consumption bluetooth can be used for mass data to exchange and by the data-pushing host computer of exchange, and upper computer software is responsible for the display and further processing of data；Exclusive wake-up agreement and reception listening mode realizes quick connection and super low-power consumption operation, uses can working time several weeks for small-capacity cells；Make connection that there is higher specific aim, certainty and security using the capacitive sensing arousal function of same contact electrode, and further reduce power consumption；The utility model can be used for Intelligent bracelet, realize handshake exchange electronic name-card, the identification system of contact certification is can also be used for, touching can obtain the exhibit information dispensing device of information, and the product that information is exchanged the need for other contacts and information is distributed.

Description

A kind of low-power consumption based on human body communication wakes up communicator

Technical field

The utility model is related to a kind of low-power consumption by human body communication and wakes up communicator, is applicable to：Social life, Handshake exchange personal information is exchanged with substituting conventional business card；Exhibition place, visit personnel are by touching having together beside showpiece The device of sample function obtains exhibit information；Identification occasion, alternative traditional identity recognition device, the elevator card in such as hotel With room card, staff's identification, also available for self-service bar, the occasion such as cafeteria；Other are related to a small amount of information and handed over Change the occasion with identification.

Background technology

Social life people mainly obtain two-sided information by exchanging visiting cards, and this mode exchanged visiting cards has following disadvantage End：Business card is easy to lose；Business card carrying information is limited；To be manually entered, imitate when needing storage contact details to mobile phone or computer There is under rate and easily mistake.

In exhibition, exhibiter is by providing brochure to visit personnel and asking for business card and oral inquiry record visit people The demand of member, brochure if excessively in detail if can be too huge without Portable belt, possibly can not clearly pass if excessively simplifying Up to product information, and brochure inherently has cost of manufacture high, transports constant, the shortcomings of modification is troublesome.

The occasion of identification such as uses key passwords the need for tradition, RFID card, and fingerprint recognition, general flow is first to recognize Identity is demonstrate,proved, the mode that control system unlocks again, operation is comparatively laborious, and Consumer's Experience is bad.

The content of the invention

The deficiency with identification authentication mode is exchanged for existing information, the utility model provides one kind and passes through human body communication Wake-up communicator, realize the functions such as exclusive wake-up connection and communication, institute's functional all realizes super low-power consumption fortune OK, device can be worked several weeks using small-capacity cells.

Device uses 15KHz-300KHz low frequency signals, and signal is connected by the contact electrode of device with body, user And another user when shaking hands signal other side's device can be sent to by body to set up the communication connection between device；Use The contact electrode that can also be touched by finger on other non-object wearing devices with said function sets up communication connection.

Before connection is set up, the discovery of physical connection between device is carried out between device by the wake-up packet periodically sent, to subtract Few power consumption, wake-up packet only uses one fixed width carrier wave, and not comprising specific data, carrier widths can be waken up in non-mode inspection Survey the device monitored.Device is sent after wake-up packet, is recognized and is monitored to receive the wake-up that other devices are sent into non-mode Bag or connection bag.Wake-up packet repeats to send to solve the conflict of two desire attachment means wake-up packets after random wait.

Device is connected, and be used as main frame control after wake-up packet is detected by sending connection bag and receiving response bag to set up Data exchange processed and connection are terminated.Because LF communication speed is too low, data can be exchanged using bluetooth after a connection setup. The data of exchange can push to host computer by bluetooth and be further processed, and upper computer software can connect distal end cloud service Device is realized more multi-functional.

Contact electrode supports capacitance detecting simultaneously, can detect human contact, as needed the unlatching of control LF communication With shut-off to reduce power consumption, program and hardware realize low frequencies, the multiplexing of low frequency reception and capacitance detecting.

It will become very simple using contact details are exchanged after the utility model device, connection can be achieved as long as once shaking hands It is the exchange of information, telephone number typing, email address record, social account number can easily be realized by coordinating the application software of host computer Addition and other information storage.

The utility model device is such as introduced to exhibition occasion, visitor can lead to the contact method of oneself and buying purpose Cross mobile phone input device（Assuming that device form is Intelligent bracelet）, exhibiter places the utility model device beside showpiece（It is false If device form is the information boxes for carrying contact）.Visitor obtains product information by the contact of touch information box, simultaneously The information such as contact method and buying purpose can also be transmitted to information boxes by bracelet, and such visitor targetedly can accurately obtain The information of product of interest, while exhibiter can also obtain the contact method and demand of visitor rapidly and set up contact.

If replacing existing gate control system using the utility model device, the door opener with the device Jing Guo certification pushes away The moment of dynamic door handle, the identity information that the contact on handle can be read by the hand of door opener, such as authentication is led to Cross, door lock is opened at once, with little need for wait.

Brief description of the drawings

Fig. 1 devices use schematic diagram.

Fig. 2 hardware composition frame charts.

Fig. 3 low frequencies are received and dispatched and capacitive sensing detection circuit diagram.

The carrier wave definition of Fig. 4 all kinds bags.

Fig. 5 bags form and the definition of data head form.

Fig. 6 communication bag forms.

Fig. 7 units wake-up packet sends and monitored sequential.

Fig. 8 wakes up the sequential of foundation connection by being waken up bag.

Fig. 9 connects the sequential of foundation by receiving connection bag and monitoring switching.

The processing sequential that Figure 10 is waken up by unknown bag.

Figure 11 connection modes switch.

Figure 12 low frequency wake-ups and communication flow diagram.

Figure 13 Bluetooth communication flow charts.

Embodiment

Accompanying drawing 1 is that device uses schematic diagram, and the people with this device can be with wearing people's handshake exchange of same sampling device Contact method, the people with this device can also exchange information with the device with other functions.Device is with Intelligent bracelet shape Formula is used, positioned at bracelet bottom contacts electrode and human contact.

Hardware composition frame chart is shown in accompanying drawing 2, and system is mainly by MCU, Bluetooth chip, low frequency reception circuit, low frequencies circuit, Capacitive sensing detection circuit and power management etc. circuit composition, button and touch input electricity may be increased for wearable device The circuits such as road, intelligent sensor circuit, display circuit and vibration reminding, need to such as transmit mass data can increase external storage Device.

The AS393x family chips of the usable Austrian microelectronics of low frequency reception chip, or Microchip companies MCP203x family chips, it is possible to use other chips with identity function.The control interface that different model chip is used is slightly Difference, for without the chip for waking up output pin, data output pin can be used directly as wake-up signal, if using not having The chip of manchester decoder function, program can be used to realize decoding.

Accompanying drawing 3 is low frequency transmitting-receiving and capacitive sensing detection circuit diagram.The circuit uses the AS3933 cores of Austrian microelectronics Piece, other similar functions chips can be also substituted for as needed.CLDAT is that manchester decoder exports clock, and DAT is that data are defeated Go out, can be in general data output and the switching of Manchester data outlet chamber.WAKE pin are known to wake up output signal in non-mode Not Jian Ting when receive the i.e. exportable high level wake-up signal of one fixed width carrier signal, when there is pattern-recognition monitoring can receive Wake-up signal is exported after to correct mode code.Low frequency reception chip input is connected to contact electricity by an electric capacity and resistance Pole.

Q1 and Q2 is combined metal-oxide-semiconductor and constitutes full bridge driving circuit, OUT_4C1, OUT_4C2, OUT_4C3 and OUT_4C4 nets Network is used for the switch for controlling 4 pipes, and realizes carrier signal output and possible carry data signals.Regulation L1 and C6 value reaches With the resonance of carrier frequency.

Contact electrode capacitance variations are sent to MCU and carry out capacitive sensing detection by C1.

By controlling the switch of 4 metal-oxide-semiconductors, signal transmitting and receiving and capacitance detecting multiplexing are realized.When carrying out capacitance detecting, 4 Individual metal-oxide-semiconductor is all off, and at this moment Q1 6 pin and 4 pin are in high-impedance state, and Q2 6 pin and 4 pin are also in high-impedance state, contact capacitance change Signal can deliver to CAP_DETECT networks.When needing to receive signal, Q1 4 pin are set as high-impedance state, 6 pin export low electricity It is flat, Q2 4 pin are set as high-impedance state, 6 pin export low level, and at this moment Low ESR is presented in each own one end of L1 and C6 over the ground, can To be selected signal and be sent into reception chip.

The carrier wave definition of all kinds bag illustrates in figure 4, wakes up packet length and tries one's best shortening, but to leave certain surplus Guarantee to wake up the device in non-mode Anti-Sniffer.The carrier wave head width of connection bag is greater than wake-up packet and general data bag Carrier wave head width, it is allowed to MCU detect carrier widths it is longer than wake-up packet when have enough time set receive chip switching To the listening mode for having pattern-recognition, and ensure that remaining carrier wave head length can wake up chip and receive whole bag.After connection is set up, The listening mode for having pattern-recognition is in due to receiving chip, communication bag can use the carrier wave head of common width.

Accompanying drawing 5 is that data packet format and data head form are defined, and CRC check can ensure the integrality of data, due to data Packet length is different, and receiving program needs according to data head and excessive data（If）First character section calculate whole bag in real time Length.Each device is given a unique device number when appearing on the scene, for distinguishing different device, and device number size can be with For 4 bytes or 6 bytes, device address is equal to device number in communication.

Accompanying drawing 6 is the form of communication data packet, and LINK connections include host address, and slave may recognize that connection bag is that What one device was sent, ACK response bags are simultaneously comprising slave addresses and host address, so as to notify which slave of main frame just to taste Examination and oneself set up connection, due to being point-to-point communication, connection set up after other bags can only using slave addresses until Connection terminates, and the bag that slave and main frame are sent uses no Packet type.Packet length can be reduced to improve by omitting host address Communication efficiency and reduction power consumption.

If device all supports high-speed communication, device can switch to bluetooth and exchange data upon connection, after the completion of exchange Detect that physical connection disconnects by low frequency signal again.

Accompanying drawing 7 is that unit wake-up packet sends and monitored sequential, illustrates the strategy that wake-up packet is sent.The dress actively waken up Put intermittently to send and wake up carrier wave, the width Twk of carrier wave.Device enters non-mode between maximum hair receives delay Ttr The listening mode of identification, device can receive connection bag or wake-up packet simultaneously within the Trpack periods.The section between Trwk Interior, device only receives wake-up packet, and other types bag will be taken as noise processed.Wake-up packet sends interval and defined by Twkb+Twkr, Twkb is the set time, can be needed to change according to the response time, Twkr is random time, this time is to solve both The conflict waken up between device with active arousal function.

Accompanying drawing 8 shows any time of reception, and the sequential of foundation connection is waken up by being waken up bag, and engraving device B is sent out during t1 Penetrate wake-up packet and enter non-mode and recognize listening mode, device A receives carrier signal, chip DAT pin output high level, subsequent core Piece WAKE pin output high level indicates to detect signal.Also can be without using WAKE pin as wake-up signal, and individually detect DAT pin Level, then thinks to receive wake-up carrier wave, why high level is thought more than special time after the high level on DAT continues special time It is normal packet, in this case, the carrier wave of wake-up packet can further shorten.After the Twkwait times are waited, the output of DAT pin Level time Tlowwait reaches certain length, it is believed that receive correct wake-up packet, t2 removes WAKE signals before terminating, during t3 Section, which is closed, receives and prepares LINK connections bag, and t4 starts to send LINK connections bag.

Accompanying drawing 9 is to connect the sequential of foundation by receiving connection bag and monitoring switching.This sequential illustrates that transmission is called out Wake up and the situation of LINK connections bag is received after wrapping.Device B sends LINK bags when t2 starts, and device A DAT toes, which show, detects load Ripple signal, then WAKE pin output high level, wait the Twkwait times after, find DAT pin be always high level explanation work as Preceding bag is not wake-up packet, and t2 removes WAKE signals before terminating, and the t3 periods, which open, pattern-recognition listening mode, due to LINK bags Carrier wave head long enough, now open to receive still can receive complete packet in the t4 periods, and the t5 periods parse the bag received, if LINK bags, then send ACK response bags when t6 starts and set up connection.

The device of LINK connections bag is sent in communication process as main frame, the device for sending ACK response bags is used as slave. Such as main frame is not sent to slave in the LINK bags of transmission, or slave ACK is not received by main frame, and main frame is postponing some time It is responsible for retransmitting LINK bags afterwards until receiving ACK bags, if can not receive ACK bags always, then it is assumed that connection failure.

Data are sent by sending DATA packets after main frame receives ACK, slave uses ADAT reply data bag responses The data from confidential transmission are also included simultaneously, if transmitting procedure has data-bag lost, main frame is responsible for retransmitting recovering connection.It is main Machine and slave then think connection time-out, the automatic company of termination when can not can not still receive the packet of other side more than certain time Connect.When both sides send without data, main frame sends END end packets and notifies slave to terminate connection, and slave sends AEND response knots Beam bag responds main frame, occurs if any packet loss, and main frame is responsible for retransmitting until receiving AEDN bags.

Accompanying drawing 10 is the processing sequential waken up by unknown bag.Between Trwk in section, device only receives wake-up packet, other numbers It will be considered as noise according to bag.If diagram, section apparatus A WAKE output high level, is waited after Twkwait, DAT pin are still during t3 For high level, illustrate carrier wave it is very long be not wake-up packet, device is closed to monitor simultaneously to send after t4 epoch delays Tdlnoise and waken up Bag continues to attempt to find other devices.

After two devices terminate connection, it is possible to which device both sides' contact electrode is connected still through human body, to avoid not Necessary to be again coupled to, slave device A is responsible for sending wake-up packet every special time, then switches to non-mode identification and monitors mould Formula, host apparatus B is received sends wake-up packet response immediately after wake-up packet, if device can receive device A wake-up packet, illustrate to touch Point electrode is not still released.For reduction power consumption, the interval that device sends carrier wave is lengthened until being kept not after length-specific every time Become.If device A can not continuously receive wake-up carrier wave several times, contact electrode release is regarded as, normal work mould is initially entered Formula.Similarly device B does not receive carrier wave bag after special time is waited and also returns to normal mode of operation.

Accompanying drawing 11 switches for connection mode.According to whether actively sending wake-up packet and whether opening low frequency reception, device can To be operated under following Three models：

(1) aggressive mode：Wake-up packet is intermittently sent, low frequency reception is always on.Now device can receive other dresses The wake-up packet put simultaneously sends connection bag and sets up connection, and other devices hair can also be received within the certain time after sending wake-up packet The connection bag come.The device that device under aggressive mode can be set up under connection, aggressive mode with the device under aggressive mode Connection can be set up with the device under Passive Mode；

(2) Passive Mode：Wake-up packet is not sent, but low frequency reception circuit works always, can receive other aggressive modes Under device wake-up packet and send connection bag set up connection.The device under device and Passive Mode under Passive Mode can not be built Vertical connection；

(3) standby mode：Wake-up packet is not sent, low frequency reception circuit does not also work.Device under standby mode can be By external wake（Such as detect that electrode is touched or button is pressed）After be switched to aggressive mode.After data exchange is finished Return to standby mode.Device under standby mode can not be set up before by external wake with the device under any pattern to be connected.

The power consumption of Three models is reduced successively, i.e., aggressive mode power consumption is more than Passive Mode, and Passive Mode power consumption, which is more than, to be treated Machine pattern.The foundation of communication will at least have a device to have the initiative pattern, and the wearable device such as general setting bracelet is operated in Aggressive mode, can just set up with any other device so in the case of nonintervention and communicate, and can add external wake The non-object wearing devices such as the device of function such as information boxes are set in standby mode, and are switched to aggressive mode upon awakening.Other hand At this moment the devices such as ring can only set up connection with odd-job in Passive Mode in order to reduce power consumption by waking up other devices, But still need when needing handshake exchange business card function and switch back into aggressive mode.

Device needs extra circuit realiration external wake under Passive Mode, according to actual needs and the part that uses not Together, there is following implementation：

（1）Capacitive sensing wakes up：Under this implementation, contact electrode is in circuit except connection tremendously low frequency transmission circuit Outside, circuit is also detected by a capacitance connection to capacitive sensing.Device inspects periodically contact capacitance change, meeting when finger is touched Contact capacitance is caused to change.The detection cycle of inductance capacitance can change as needed, and shorter detection cycle can be realized shorter Response time but higher power consumption is also correspondingly brought, when using longer detection cycle, the response time can be elongated, but Reduce electrical source consumption；

（2）Mechanical key or switch:The button cap of a metal is added on standard machinery button, button cap is in product The internal low frequencies contact portion by spring and device.After user pushes button cap and turns on button, device quilt Wake up and send wake-up packet immediately, signal is sent to the finger of user by button cap, is then delivered to what user wore Device is to set up connection；

（3）Other wake-up modes：Light sensing（Notice that this mode needs certain environment to close and could worked）, infrared biography Sensor（Correlation and reflection infrared sensor can be used as needed）, acceleration transducer, inclination sensor etc..

It can only exchange a small amount of data such as contact method due to the limitation of LF communication speed, between device, addresses of items of mail, The information such as network address and a small amount of text, can cause call duration time to be elongated for exchanging the Large Volume Datas such as a large amount of texts and picture, Here two methods are proposed to exchange mass data：

（1）User will need the information exchanged to be stored on the server by upper computer software, and these information can include Need the information of bigger memory space, such as picture and big file etc..This information is tied on user account number by server And generate a link address.LF communication only transmits link address when information is exchanged, and host computer downloads all letters by network Cease and do corresponding processing；

（2）Low-speed communication switch identifier, then both devices the height of point-to-point is set up by device identifier Fast wireless communication connection, exchanges mass data again on this connection.High-speed radio is connected with the mode of being implemented as described below：Device increase One wireless chip, when not in use in a dormant state, LF communication, which is obtained, opens this chip and then and other side after device number Wireless chip set up connection after exchange data, this mode can increase installation cost and small product size；Both sides temporarily disconnect respective Bluetooth connection between host computer, two devices set up bluetooth connection, each self- recoverage and host computer again after data exchanging completed Between bluetooth connection, this realization does not increase cost, but due to the connection of temporarily disconnected host computer, is likely to result in Consumer's Experience not It is good；The connection between bluetooth and host computer is not turned off, using the connection time slot switched data between bluetooth and host computer, this mode is needed Bluetooth bottom layer driving is controlled to realize communication multiplexing.

Figure 12 is low frequency wake-up and communication flow diagram, for wearable device, and whether detection contact capacitance carrys out judgment means Correctly worn, for non-wearable device, contact capacitance change can as external wake signal, no matter that situation, only Contact just starts to send low frequency wake-up bag to seek the connection of other devices after being touched.Part connection is eliminated in flow chart super When processing procedure, practical programs can be added as needed on timeout treatment.

Figure 13 is Bluetooth communication flow chart, it is necessary to which the connection of the period communicated between device, bluetooth and respective host computer may Need to be temporarily switched off, pending data exchanges to finish to be recovered again, can also not turn off host computer connection, and will be connected interval with host computer and be increased Greatly, and it is spaced between device and is communicated using connection.

Claims (10)

1. a kind of low-power consumption based on human body communication wakes up communicator, its feature includes：Communicated by human body；Low frequency is believed Number sending and receiving end and capacitive sensing input can be realized in a contact electrode；The design of proprietary carrier wave wake-up packet and packet, matches somebody with somebody Low-power consumption and quickly connection are realized in the intelligence switching that splice grafting receives listening mode；Communication protocol realizes connection, communicates, and disconnects, Packet loss retransmits and waken up the functions such as conflict avoiding；Distinctive physics disconnection detection function, effectively prevents from repeating to connect and support Low-power consumption；Connection can switch to bluetooth transmission as needed after setting up；Host computer procedure and cloud service function.

2. the low-power consumption according to claim 1 based on human body communication wakes up communicator, it is characterised in that：Frequency of use Scope 15KHz to 300KHz low frequency signal carries out waking up communication between device by human body medium.

3. the low-power consumption according to claim 1 based on human body communication wakes up communicator, it is characterised in that：Low frequency signal Sending and receiving end and capacitive sensing input are connected on a contact, pass through circuit design and programme-control, low frequencies signal, low frequency Receive signal and capacitive sensing signal timesharing uses contact, without influenceing respective function, capacitive sensing testing result is used to fill Put wake-up, it can also be used to detect that wearable device comes off.

4. the low-power consumption according to claim 1 based on human body communication wakes up communicator, it is characterised in that：Wake-up packet makes With very short carrier signal rather than longer packet；Electricity on output pin and data output pin can be waken up according to chip is received Flat width judges whether to receive wake-up packet, also individually can judge whether to receive wake-up packet according to level width on data output pin.

5. the low-power consumption according to claim 1 based on human body communication wakes up communicator, it is characterised in that：Connection bag ratio Other types bag uses longer carrier wave head, and device enters non-mode after transmitting wake-up packet and recognizes listening mode, only receiving Band model identification listening mode is just switched to after to the carrier signal to certain length, as the carrier signal received is very short, is thought It is the wake-up packet of other devices transmitting, can so makes device can be while listening for wake-up packet in a period of time after transmitting wake-up packet With connection bag, this working method can avoid waking up to greatest extent to conflict.

6. the low-power consumption according to claim 1 based on human body communication wakes up communicator, it is characterised in that：Various data Package definition, communication bag after connection only using slave devices number identification connection to reduce communication packet length, retransmitted with packet loss and Overtime break function.

7. the low-power consumption according to claim 1 based on human body communication wakes up communicator, it is characterised in that：Use fixation The mode of delay plus random delay sets wake-up packet transmission interval to solve to wake up conflict, and controls power consumption as needed.

8. the low-power consumption according to claim 1 based on human body communication wakes up communicator, it is characterised in that：Effectively prevent Repeat to connect, after connection disconnects, slave intermittently sends wake-up packet, and main frame is received to be responded also by wake-up packet, rather than is made Disconnected with larger packet detection physical connection, wake-up packet send interval increase every time until fixed after specific maximum with Reduce device power consumption.

9. the low-power consumption according to claim 1 based on human body communication wakes up communicator, it is characterised in that：Connection is set up High-speed data exchange is carried out by bluetooth using appliance arrangement number afterwards, interval is connected with host computer using both sides' bluetooth is led to Letter disconnects host computer communication, and pending data exchange recovers host computer connection again after finishing.

10. the low-power consumption according to claim 1 based on human body communication wakes up communicator, it is characterised in that：Host computer Software realizes presentation of information, information storage and other functions：Other side is added to oneself social account, communicating number, storage is added Photo, sends mail, external connection of product information etc..