CN217388702U

CN217388702U - Bidirectional magnetic induction type wireless signal transmission circuit

Info

Publication number: CN217388702U
Application number: CN202220885017.XU
Authority: CN
Inventors: 程世友; 杨兴波; 范俊杰; 芮烨
Original assignee: Zhejiang Jingri Science And Technology Co ltd
Current assignee: Zhejiang Jingri Science And Technology Co ltd
Priority date: 2022-04-15
Filing date: 2022-04-15
Publication date: 2022-09-06
Anticipated expiration: 2032-04-15

Abstract

The utility model discloses a two-way magnetic induction formula wireless signal transmission circuit belongs to wireless signal transmission technical field. Need pair emission unit and receiving element in advance when the near field communication who exists to prior art, control complicacy, use special chip problem such as with high costs, the utility model discloses the circuit is including the first unit that is used for emission signal unit or received signal unit to and the corresponding second unit that is used for received signal unit or emission signal unit, the border that the emission signal unit passes through signal change becomes pulsed magnetic field, the rising edge of signal and the falling edge of signal correspond the pulsed magnetic field of two directions respectively, the received signal unit passes through induction coil, convert the magnetic field of pulse into the signal of telecommunication of pulse, rethread schmidt trigger circuit, restore the signal. The utility model discloses transmission circuit need not to pair in advance, realizes the transmission of signal through magnetic induction, all does not have the requirement to the frequency and the agreement of signal, simple structure, and is with low costs.

Description

Bidirectional magnetic induction type wireless signal transmission circuit

Technical Field

The utility model relates to a wireless signal transmission technical field, more specifically say, relate to a two-way magnetic induction formula wireless signal transmission circuit.

Background

Wireless communication (Wireless communication) is a communication method for exchanging information by utilizing the characteristic that an electromagnetic wave signal can propagate in a free space. In the field of information communication in recent years, the most rapidly developed and widely used wireless communication technology is used.

Zigbee is a short-range, low-power wireless communication protocol. The greatest advantage is that it can automatically form a network of devices and link direct data transfer of each device. Since most Zigbee devices have no gateway, the installation cost of Zigbee is high. Bluetooth is a wireless communication module that can implement short-distance data exchange between fixed terminal equipment, mobile terminal equipment and personal area networks. The Bluetooth wireless technology has high complexity, high equipment networking speed and high integration level and reliability. Both the ZigBee wireless communication technology and the Bluetooth wireless communication technology are short-distance wireless communication technologies, when signals are transmitted through ZigBee or Bluetooth, firstly, pairing connection is needed, if connected equipment needs to be replaced, disconnection is needed, then new connected equipment needs to be matched, and for some scenes needing mobile connection while playing, convenience is greatly reduced.

The NFC technology can realize the above applications of instant connection and release without the need of pairing and connecting in advance, but the NFC technology specifies the communication rate and protocol and needs a dedicated chip to support, and has a complex structure, needs a dedicated chip, and is high in cost.

Disclosure of Invention

1. Technical problem to be solved

Need pair transmitting element and receiving element in advance during the near field communication to existence among the prior art, control complicacy, use special chip problem such as with high costs, the utility model provides a magnetic induction formula wireless signal transmission circuit, it can realize need not to pair in advance, realizes the transmission of signal through magnetic induction, all does not have the requirement to the frequency and the agreement of signal, simple structure, and is with low costs.

2. Technical scheme

The purpose of the utility model is realized through the following technical scheme.

A bidirectional magnetic induction type wireless signal transmission circuit comprises a first unit and a second unit which have the same circuit structure and connection relation, wherein the first unit is a signal transmitting unit or a signal receiving unit, and the second unit is a signal receiving unit or a signal transmitting unit; the utility model discloses there is not the restriction to transmitted signal unit and received signal unit, and transmitted signal unit can be regarded as to first unit or second unit, also can regard as received signal unit, works as when transmitted signal unit transmitted signal is regarded as to first unit, the second unit is regarded as received signal unit received signal, works as when transmitted signal unit transmitted signal is regarded as to the second unit, first unit is regarded as received signal unit received signal.

The first unit and the second unit respectively comprise a power driving and signal restoring unit, a system signal bus unit, a power driving unit, a signal restoring unit, a differential coupling and clamping unit, an induction coil unit and a system signal bus control unit, the system signal bus unit is respectively connected with the system signal bus control unit, the power driving and signal restoring unit, the power driving unit and the signal restoring unit are respectively connected with the power driving and signal restoring unit and the differential coupling and clamping unit, and the differential coupling and clamping unit is also connected with the induction coil unit.

Further, the first unit and the second unit are arranged in a mirror image. The first unit and the second unit are arranged in a mirror image mode, and when the first unit induction coil has a counterclockwise current pulse, the second unit induction coil also generates a counterclockwise voltage pulse.

Furthermore, the system signal bus unit comprises a communication chip, the power driving unit comprises a driving chip, and the signal recovery unit comprises a schmitt chip.

Furthermore, the power driving and signal recovering unit comprises a first switch circuit chip, a first RC charge-discharge circuit and a first shaping circuit chip, wherein the first RC charge-discharge circuit is arranged between the first switch chip and the first shaping circuit chip, a first DIR end of the first shaping circuit chip is connected with the power driving unit and the signal recovering unit, and the first DIR end is an enabling and disabling control port of a driving chip of the power driving unit and a Schmidt chip of the signal recovering unit.

Furthermore, the system signal bus control unit comprises a second switch circuit chip, a second RC charge-discharge circuit and a second shaping circuit chip, wherein the second RC charge-discharge circuit is arranged between the second switch chip and the second shaping circuit chip, a second DIR end of the second shaping circuit chip is connected with the communication chip of the system signal bus unit, and the second DIR end is a communication direction control port of the system signal bus unit.

Furthermore, the communication chip of the system signal bus unit further includes a port A, B, C, a terminal B of the communication chip is connected to the driving chip of the power driving unit, a terminal C of the communication chip is connected to the schmitt chip of the signal restoring unit, both the driving chip and the schmitt chip are connected to the differential coupling and clamping unit, and the differential coupling and clamping unit is further connected to the induction coil.

Furthermore, the differential coupling and clamping unit comprises a first voltage-dividing resistor, a second voltage-dividing resistor and an isolation capacitor, wherein the first voltage-dividing resistor and the second voltage-dividing resistor are both connected with the isolation capacitor, the other end of the first voltage-dividing resistor is connected with a power supply, and the other end of the second voltage-dividing resistor is grounded.

Furthermore, the resistance values of the divider resistors are the same.

Furthermore, the first unit and the second unit further include a current limiting resistor, and the current limiting resistor is disposed between the differential coupling and clamping unit and the induction coil unit, or the current limiting resistor is disposed in the differential coupling and clamping unit. The current-limiting resistor enables the waveform of the line to be more stable, and the resistance value of the current-limiting resistor can be adjusted to be zero to any value according to the debugging condition of the actual circuit.

Furthermore, the switching circuit chip and the shaping circuit chip of the power driving and signal recovery unit, and the driving chip of the power driving unit are implemented by using separate components. Under the prerequisite of realizing the same function, the utility model discloses a driver chip, switch circuit chip and plastic circuit chip can use the discrete component.

3. Advantageous effects

Compared with the prior art, the utility model has the advantages of:

the utility model discloses a two-way magnetic induction formula wireless signal transmission circuit, with low costs, circuit structure is simple, is applicable to near field communication, can realize receiving and dispatching end and be close to transmission signal, leaves certain distance back disconnection communication, and when a plurality of communication system used simultaneously, need not to pair each other, is close to and can communicates.

The transmission signal unit of circuit passes through the border that the signal changes and becomes pulsed magnetic field, and the rising edge of signal and the falling edge of signal correspond the pulsed magnetic field of two directions respectively, and when the transmission signal unit does not transmit the signal, whole circuit system is in static state, low power dissipation. The signal receiving unit converts the magnetic field of the pulse into an electric signal of the pulse through the induction coil, and then restores the signal through the Schmidt trigger circuit. The transmission is transparent, no requirement is made on the transmission protocol, equipment or signal coding, and the method is suitable for wide application.

Drawings

FIG. 1 is a schematic structural diagram of a first unit or a second unit of the present invention;

FIG. 2 is a schematic circuit diagram of a first unit or a second unit according to the present invention;

FIG. 3 is a schematic diagram of the bidirectional wireless signal transmission circuit of the present invention;

the labels in the figure represent:

100. a power driving and signal restoring unit; 200. a system signal bus unit; 300. a power driving unit; 400. a signal recovery unit; 500. a differential coupling and clamping unit; 600. an induction coil unit; 700. and a system signal bus control unit.

Detailed Description

The invention is described in detail below with reference to the drawings and specific examples.

Examples

This embodiment provides a magnetic induction formula wireless signal transmission circuit, the circuit includes first unit and the second unit that circuit structure and relation of connection are the same completely, first unit with the second unit is the mirror image and distributes, and the circuit adopts induction type signal transmission's mode, realizes reliable near-range signal transmission with low cost. The circuit of the embodiment can realize bidirectional magnetic induction wireless signal transmission, that is, when the first unit transmits signals as a signal transmitting unit, the second unit receives signals as a signal receiving unit, and when the second unit transmits signals as a signal transmitting unit, the first unit receives signals as a signal receiving unit.

As shown in fig. 1, the first unit or the second unit is a schematic structural diagram, and includes a power driving and signal recovering unit 100, a system signal bus unit 200, a power driving unit 300, a signal recovering unit 400, a differential coupling and clamping unit 500, an induction coil unit 600 and a system signal bus control unit 700, as shown in the figure, the system signal bus control unit 700 is connected to the system signal bus unit 200, the system signal bus unit 200 is respectively connected to the power driving unit 300 and the signal recovering unit 400, the power driving unit 300 and the signal recovering unit 400 are both connected to the differential coupling and clamping unit 500, the differential coupling and clamping unit 500 is connected to the induction coil unit 600, and the power driving unit 300 and the signal recovering unit 400 are both connected to the power driving and signal recovering unit 100; the system signal bus unit 200 is an input/output port for the bidirectional wireless communication circuit system to communicate with an external circuit, and the system signal bus unit 200 is used for sending a signal of the external circuit to the power driving unit 300 and sending a signal of the signal recovery unit 400 to the external circuit; the power driving unit 300 is used for increasing the signal power and driving the induction coil unit 600, the signal restoring unit 400 is used for restoring the pulse signal of the differential coupling and clamping unit 500 into a square wave signal which can be recognized by the system signal bus unit 200, and the differential coupling and clamping unit 500 is used for extracting the pulse signal of the induction coil unit 600 and maintaining the output signal of the signal restoring unit 400 not to reset; the induction coil unit 600 is used for transmitting an electromagnetic signal to the signal recovery unit 400 through a pulsed electromagnetic field from the power driving unit 300, or receiving an electromagnetic signal, and the system signal bus control unit 700 is used for controlling the communication direction of the system signal bus unit 200.

As shown in fig. 2, a circuit diagram of the first unit or the second unit is illustrated by taking the first unit as an example, the system signal bus unit 200 circuit includes a communication chip U11, the power driving unit 300 circuit includes a driving chip U12, the signal recovery unit 400 circuit includes a schmitt chip U13, the power driving and signal recovery unit 100 circuit includes a first switching circuit chip U14 and a first shaping circuit chip U15, the system signal bus control unit 700 circuit includes a second switching circuit chip U16 and a second shaping circuit chip U17, the differential coupling and clamping unit 500 includes resistors R11 and R12 and a capacitor C11, and the induction coil unit 600 circuit includes an induction coil and a resistor R13; the chip U11 comprises ports A1, B1, C1 and DIR11, wherein the port A1 is a SIG _ BUS1 end, the SIG _ BUS1 end is a signal input and output port of the whole system of the first unit, and the port DIR11 is a communication direction control port of the chip U11.

The B1 end of the chip U11 is connected with the chip U12, the C1 end of the chip U11 is connected with the chip U13, the chip U12 and the chip U13 are connected with resistors R11, R12 and a capacitor C11, the connection point is defined as a point D1, the other end of the resistor R11 is connected with a power supply VCC, the other end of the resistor R12 is grounded, the other end of the capacitor C11 is connected with an induction coil ANT1, and the capacitor C11 and the induction coil ANT1 form a resonant circuit; the chip U14 comprises ports B1 and G1, the end B1 of the chip U14 is connected with the end B1 of the chip U11, the end G1 of the chip U14 is respectively connected with a capacitor C12, a resistor R14 and a chip U15, the other end of the capacitor C12 is connected with a power supply VCC, the other end of the resistor R14 is grounded, the end DIR12 of the chip U15 is connected with the chip U12 and the chip U13, and the DIR12 port is an enable-disable control port of the chip U12 and the chip U13; the chip U16 comprises ports C1 and H1, the C1 end of the chip U16 is connected with the C1 end of the chip U11, the H1 end of the chip U16 is respectively connected with a capacitor C13, a resistor R15 and a chip U17, the other end of the capacitor C13 is connected with a power supply VCC, the other end of the resistor R15 is grounded, and the DIR11 end of the chip U17 is connected with the DIR11 end of the chip U11. As voltage dividing resistors, the resistances of the resistors R11 and R12 are the same, the U13 input end keeps (1/2) VCC when no signal is input, the signal output keeps the last state, and the chip U13 has the Schmidt trigger characteristic and shapes the pulse signal at the input end into square waves.

As shown in fig. 3, in the second unit circuit, the system signal bus unit 200 circuit includes a communication chip U21, the power driving unit 300 circuit includes a driving chip U22, the signal recovery unit 400 circuit includes a schmitt chip U23, the power driving and signal recovery unit 100 circuit includes a first switching circuit chip U24 and a first shaping circuit chip U25, the system signal bus control unit 700 circuit includes a second switching circuit chip U26 and a second shaping circuit chip U27, the differential coupling and clamping unit 500 includes resistors R21, R22 and a capacitor C21, and the induction coil unit 600 circuit includes an induction coil and a resistor R23; the chip U21 comprises ports A2, B2, C2 and DIR21, wherein the port A2 is a SIG _ BUS2 terminal, the SIG _ BUS2 terminal is a signal input and output port of the whole system of the second unit, and the port DIR21 is a communication direction control port of the chip U21.

The B2 end of the chip U21 is connected with the chip U22, the C2 end of the chip U21 is connected with the chip U23, the chip U22 and the chip U23 are connected with resistors R21, R22 and a capacitor C21, the connection point is defined as a point D2, the other end of the resistor R21 is connected with a power supply VCC, the other end of the resistor R22 is grounded, the other end of the capacitor C21 is connected with an induction coil ANT2, and the capacitor C21 and the induction coil ANT2 form a resonant circuit; the chip U24 comprises ports B2 and G2, the end B2 of the chip U24 is connected with the end B2 of the chip U21, the end G2 of the chip U24 is respectively connected with a capacitor C22, a resistor R24 and a chip U25, the other end of the capacitor C22 is connected with a power supply VCC, the other end of the resistor R24 is grounded, the end DIR22 of the chip U25 is connected with the chip U22 and the chip U23, and the ports DIR22 are enabling and disabling control ports of the chip U22 and the chip U23; the chip U26 comprises ports C2 and H2, the C2 end of the chip U26 is connected with the C1 end of the chip U21, the H2 end of the chip U26 is respectively connected with a capacitor C23, a resistor R25 and a chip U27, the other end of the capacitor C23 is connected with a power supply VCC, the other end of the resistor R25 is grounded, and the output end DIR21 of the chip U27 is connected with the DIR21 end of the chip U21. As voltage dividing resistors, the resistances of the resistors R21 and R22 are the same, the U23 input end keeps (1/2) VCC when no signal is input, the signal output keeps the last state, and the chip U23 has the Schmidt trigger characteristic and shapes the pulse signal at the input end into square waves.

In conjunction with fig. 1 and 2, the chip U11 or U21 is used for communication with the outside world; the chip U12 or U22 is a driving circuit, and outputs the signal at the point B1 to a resonant circuit formed by a capacitor C11 and an induction coil ANT1 after being enhanced, or outputs the signal at the point B2 to a resonant circuit formed by a capacitor C21 and an induction coil ANT2 after being enhanced. Chips U14, U24, U16 and U26 are used as switch circuit chips, and the chips correspond to input terminals B1, B2, C1 and C2 to control the on or off of signals, and further control an RC charging and discharging circuit consisting of a capacitor C12 and a resistor R14, a capacitor C22 and a resistor R24, a capacitor C13 and a resistor R15, and a capacitor C23 and a resistor R25. The chips U15, U25, U17, and U27 are used as shaping circuit chips for shaping sawtooth waves charged and discharged by the capacitor C12 and the resistor R14, the capacitor C22 and the resistor R24, the capacitor C13 and the resistor R15, and the capacitor C23 and the resistor R25 into fixed level signals. The capacitor C11 or C21 is a dc blocking coupling capacitor and has a function of controlling the waveform of the induction coil ANT1 or ANT 2.

As an improvement of this embodiment, the chips U12, U22, U14, U24, U16, and U26 may also be separated components to implement corresponding functions.

As an improvement of this embodiment, the first unit circuit shown in fig. 1 further includes a resistor R13, the resistor R13 is connected between the capacitor C11 and the induction coil ANT1, the second unit circuit shown in fig. 2 further includes a resistor R23, the resistor R23 is connected between the capacitor C21 and the induction coil ANT2, the resistor R13 or R23 stabilizes the line waveform, the resistance value of the resistor R13 or R23 is adjustable to zero to an arbitrary value according to the debugging conditions of the actual circuit, the order of the arrangement of the resistor R13 and the capacitor C11 is adjustable, and the order of the arrangement of the resistor R23 and the capacitor C21 is adjustable.

The embodiment determines the signal transmitting unit for transmitting signals according to the arrival sequence of the signals in the circuit. Referring to the drawings, if a signal is present at the input end A1 of the chip U11 in FIG. 1 or at the input end A2 of the chip U21 in FIG. 2, the circuit unit serves as a signal transmitting unit for transmitting signals. If the induction coil ANT1 in fig. 1 or the induction coil ANT2 in fig. 2 has a signal, the circuit unit serves as a signal receiving unit for receiving the signal.

As shown in fig. 1 and 2, when no signal is input, the input terminal a1 point of the chip U11, the induction coil ANT1, and the input terminal a2 point of the chip U21, and the induction coil ANT2 have no signal input, and at this time, it is assumed that the a1 point and the a2 point are at high level, the B1 point and the C1 point output by the chip U11, and the B2 point and the C2 point output by the chip U21 are at high level, the chips U14 and U24 are in off state, the output terminal G1 point of the chip U14 and the output terminal G2 point of the chip U24 are at low level, the output points DIR2 and DIR2 of the chips U2 and U2 are at low level, the chips U2 and U2 are in a non-enable state, the output terminals U2 and U2 are at high-impedance state, the chips U2 and U2 are at low level, the output terminals 2 and U2 and 2 are at low level, the point D1 of the voltage division circuit formed by the resistors R11 and R12 is (1/2) VCC, the point D2 of the voltage division circuit formed by the resistors R21 and R22 is (1/2) VCC, the induction coils ANT1 and ANT2 are equivalent to wires, the left side of the capacitor C11 and the right side of the capacitor C21 are positive charges, the right side of the capacitor C11 and the left side of the capacitor C21 are negative charges, the capacitors C11 and C21 are fully charged, and no current flows on the induction coils.

When a signal is input, the SIG _ BUS1 is input by the first unit input end A1, and the first unit circuit is a signal transmitting unit and the second unit is a signal receiving unit. When a signal is input to SIG _ BUS1, a point a1 is changed from high level to low level, a point B1 of a chip U11 is changed into low level, a chip U14 is turned on, a point G1 of an output terminal of a chip U14 is in short circuit with VCC, a capacitor C12 discharges rapidly, a point G1 changes into high level, a point DIR12 of an output terminal of a chip U15 changes into high level, a chip U12 is enabled, the chip U13 is disabled, a signal at a point B1 of an output terminal of a chip U11 is enhanced by the chip U12 and then sent to a point D1, the potential at the point D1 is pulled down, the capacitor C11 discharges through an induction coil ANT1 and a resistor R13, a large instantaneous current is generated in the induction coil ANT1 at the moment, the current direction is in a counterclockwise direction, and the current decreases until the current approaches zero along with the gradual inversion of the capacitor voltage. When the input signal of the first unit input end a1 point SIG _ BUS1 changes again, the point a1 is converted from low level to high level, the point B1 of the output end B11 of the chip U11 is turned over to high level, the chip U14 is turned off, the RC circuit formed by the capacitor C12 and the resistor R14 charges slowly, the potential of the point G1 drops slowly, because the voltage does not drop below the low level input threshold voltage of the chip U15, the output end DIR12 of the chip U15 is kept at high level, the chip U12 is kept enabled, the chip U13 is kept disabled, the signal of the point B1 of the output end B11 of the chip U11 is enhanced by the chip U12 and then sent to the point D1, the potential of the point D1 is pulled up, the capacitor C11 is charged by the induction coil ANT1 and the resistor R13, a large instantaneous current is generated in the induction coil, the current direction is clockwise, and the current decreases as the capacitor voltage gradually turns over, and the current approaches zero. The signal transmitting unit is used for converting the edge of the signal input from high level to low level into a counterclockwise current pulse on the induction coil, and the signal transmitting unit is used for converting the edge of the signal input from low level to high level into a clockwise current pulse on the induction coil.

The pulse current of the induction coil ANT1 generates a pulse magnetic field according to the magnetic effect principle of the current, when the induction coil ANT2 of the second unit, which is a signal receiving unit, approaches the induction coil ANT1, the magnetic field generated by the induction coil ANT1 is coupled to the induction coil ANT2 according to the electromagnetic induction principle, and the induction coil ANT2 generates the pulse current and generates a corresponding pulse voltage. When the sensing coil ANT1 has a counterclockwise current pulse, the sensing coil ANT2 induces an opposite current pulse, because the sensing coil ANT2 in fig. 2 is arranged in a mirror image with the sensing coil ANT1 in fig. 1, so the sensing coil ANT2 also generates a counterclockwise voltage pulse, the resistors R21 and R22 divide the voltage by (1/2) VCC to keep the chip U23 in the previous state without signal input, the induced voltage pulse is coupled with the power voltage dividing circuits R21 and R22 through the capacitor C21 to generate a forward pulse based on (1/2) VCC, the schmitt circuit has a window comparison characteristic, the pulse voltage exceeds the upper limit of the window, the schmitt circuit chip U23 outputs a high level immediately, after the pulse is ended, the input of the chip U23 is kept at (1/2) VCC, and because of the holding characteristic of the schmitt circuit, the output terminal C2 point of the chip U23 still keeps the high level, the chip U23 has converted the incoming up pulse to a high level. When the induction coil ANT1 emits clockwise current pulse, the induction coil ANT2 generates clockwise voltage pulse, the induced voltage pulse is coupled with the power voltage divider circuit R21, R22 through the capacitor C21, a reverse pulse on (1/2) VCC basis is generated, the reverse pulse voltage is lower than the lower limit of a Schmidt window, the Schmidt circuit U23 outputs low immediately, after the pulse is finished, because of the holding characteristic of the Schmidt circuit, the output end C2 point of the chip U23 still keeps low level, and the input downward pulse is converted into low level.

When the C2 point of the output end of the chip U23 is at a low level, the chip U26 is turned on, the H2 point is in short circuit with VCC, the capacitor C23 discharges quickly, the H2 point becomes a high level, the DIR21 point becomes a high level, the communication direction of the chip U21 is switched into a signal which is input from the C2 point and output from the A2 point; when the output end C2 of the chip U23 is at a high level, the chip U26 is turned off, an RC circuit formed by the capacitor C23 and the resistor R25 is charged slowly, the potential at the point G2 drops slowly, and the potential does not drop below the low-level input threshold voltage of the chip U27, so that the output DIR21 of the chip U27 is kept at the high level, and the communication direction of the chip U21 is kept unchanged.

In this embodiment, the second unit completely reproduces the signal of the first unit, the circuit of this embodiment only transmits the change edge of the signal, has no carrier wave, is transparently transmitted, has no requirement on a signal protocol, does not transmit any signal in a static state, has low static power consumption, and has no special requirement on the frequency of the signal.

If there is a signal input at the point SIG _ BUS2 of the input terminal a2 of the second unit, the second unit circuit is a signal transmitting unit and the first unit is a signal receiving unit.

The present invention and its embodiments have been described above schematically without limitation, and can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The embodiment shown in the drawings is only one embodiment of the invention, the actual structure is not limited thereto, and any reference signs in the claims shall not limit the claims concerned. Therefore, if a person skilled in the art receives the teachings of the present invention, without inventive design, a similar structure and an embodiment to the above technical solution should be covered by the protection scope of the present patent. Furthermore, the word "comprising" does not exclude other elements or steps, and the word "a" or "an" preceding an element does not exclude the inclusion of a plurality of such elements. Several of the elements recited in the product claims may also be implemented by one element in software or hardware. The terms first, second, etc. are used to denote names, but not any particular order.

Claims

1. A bidirectional magnetic induction type wireless signal transmission circuit is characterized by comprising a first unit and a second unit which have the same circuit structure and connection relation, wherein the first unit is a signal transmitting unit or a signal receiving unit, and the second unit is a signal receiving unit or a signal transmitting unit;

2. The bi-directional magnetic induction type wireless signal transmission circuit according to claim 1, wherein the first unit and the second unit are arranged in a mirror image manner.

3. The bidirectional magnetic induction type wireless signal transmission circuit according to claim 1 or 2, wherein the system signal bus unit comprises a communication chip, the power driving unit comprises a driving chip, and the signal recovery unit comprises a schmitt chip.

4. The bidirectional magnetic induction type wireless signal transmission circuit according to claim 3, wherein the power driving and signal recovery unit comprises a first switch circuit chip, a first RC charge-discharge circuit and a first shaping circuit chip, the first RC charge-discharge circuit is arranged between the first switch chip and the first shaping circuit chip, a first DIR end of the first shaping circuit chip is connected with the power driving unit and the signal recovery unit, and the first DIR end is an enable disable control port of a Schmitt chip of the power driving unit and the signal recovery unit.

5. The bidirectional magnetic induction type wireless signal transmission circuit according to claim 4, wherein the system signal bus control unit comprises a second switch circuit chip, a second RC charge-discharge circuit and a second shaping circuit chip, the second RC charge-discharge circuit is arranged between the second switch chip and the second shaping circuit chip, a second DIR end of the second shaping circuit chip is connected with the communication chip of the system signal bus unit, and the second DIR end is a communication direction control port of the system signal bus unit.

6. The bidirectional magnetic induction type wireless signal transmission circuit of claim 3, wherein the communication chip of the system signal bus unit further comprises a port A, B, C, the terminal B of the communication chip is connected to the driving chip of the power driving unit, the terminal C of the communication chip is connected to the Schmitt chip of the signal recovery unit, the driving chip and the Schmitt chip are both connected to the differential coupling and clamping unit, and the differential coupling and clamping unit is further connected to the induction coil.

7. The bi-directional magnetic induction wireless signal transmission circuit according to claim 3, wherein the differential coupling and clamping unit comprises a first voltage dividing resistor, a second voltage dividing resistor and an isolation capacitor, the first voltage dividing resistor and the second voltage dividing resistor are both connected to the isolation capacitor, the other end of the first voltage dividing resistor is connected to the power supply, and the other end of the second voltage dividing resistor is connected to the ground.

8. The circuit according to claim 7, wherein the resistances of the voltage dividing resistors are the same.

9. The bi-directional magnetic induction wireless signal transmission circuit of claim 1, wherein the first unit and the second unit further comprise a current limiting resistor, the current limiting resistor is disposed between the differential coupling and clamping unit and the induction coil unit, or the current limiting resistor is disposed in the differential coupling and clamping unit.

10. The bi-directional magnetic induction wireless signal transmission circuit of claim 5, wherein the switch circuit chip and the shaping circuit chip of the power driving and signal recovery unit, and the driving chip of the power driving unit are implemented by using separate components.