Signal transmitting circuit, wireless communication module and electronic device

Abstract

The application is suitable for the field of communication technology, and provides a signal transmitting circuit, a wireless communication module and an electronic device. The signal transmitting circuit comprises an inductor module, a switch module, a pulse excitation source and an electrode; the pulse excitation source is used for outputting a short pulse signal; the switch module is used for grounding the controlled end of the inductor module when the short pulse signal is high, so as to short-circuit the electrode and charge the inductor module by a direct current power supply; the switch module is also used for disconnecting the connection between the controlled end of the inductor module and the ground when the short pulse signal is low, so that the inductor module and the electrode form a series resonant network, and the inductor module radiates the stored electric energy to the outside through the electrode. The structure of the circuit is relatively simple, and the miniaturization design is facilitated; by using the short pulse signal as the excitation signal, the circuit can stably emit a single frequency signal to the outside; and by setting the resonant frequency of the series resonant network as an integer multiple of the frequency of the short pulse signal, the electric energy output efficiency of the circuit can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of communication, in particular to a signal transmitting circuit, a wireless communication module and an electronic device. BACKGROUND

[0002] With the continuous development of mobile communication technology, electronic devices such as mobile phones, tablet computers and the like are usually configured with wireless communication modules. The electronic device can transmit wireless signals to the outside through the signal transmitting circuit in the wireless communication module to realize wireless communication with other devices or realize touch point recognition function of the touch screen of the electronic device. However, the structure of the signal transmitting circuit in the related art is relatively complex, which leads to a large overall size of the signal transmitting circuit, and is not conducive to the miniaturization design of the signal transmitting circuit. In addition, the harmonic suppression level of the signal transmitting circuit is low, which leads to a large number of harmonic components in the transmitted signal, i.e. the electronic device cannot stably transmit single-frequency signals to the outside, thereby reducing the stability of the wireless communication of the electronic device or reducing the accuracy and stability of the touch point recognition of the electronic device. SUMMARY

[0003] The signal transmitting circuit provided by the embodiments of the present application has a high harmonic suppression level and a high power output efficiency, and can stably transmit single-frequency signals to the outside. In addition, the structure of the signal transmitting circuit is simple, which is conducive to the miniaturization design of the signal transmitting circuit.

[0004] In a first aspect, the embodiments of the present application provide a signal transmitting circuit, comprising an inductor module, a switch module, a pulse excitation source and an electrode; a first end of the inductor module is used for connecting a direct current power supply, a second end of the inductor module is connected with a first end of the electrode, and a second end of the electrode is grounded; a first end of the pulse excitation source is grounded, and a second end of the pulse excitation source is connected with a controlled end of the switch module; the pulse excitation source is used for outputting a short pulse signal with a duty cycle less than a preset duty cycle threshold to the switch module to control the on-off of the switch module; a first conduction end of the switch module is connected with the controlled end of the inductor module, and a second conduction end of the switch module is grounded; the switch module is used for connecting the controlled end of the inductor module to the ground to short-circuit the electrode when the short pulse signal is at a high level, so that the direct current power supply charges the inductor module; and the switch module is also used for disconnecting the connection between the controlled end of the inductor module and the ground when the short pulse signal is at a low level, so that the inductor module and the electrode form a series resonant network, and the inductor module radiates the stored electric energy to the outside through the electrode to realize a wireless signal transmitting function.

[0005] The resonant frequency of the series resonant network is an integer multiple of the frequency of the short pulse signal. The resonant frequency of the series resonant network can be determined by the inductive reactance value of the inductor module and the capacitive reactance value of the electrode.

[0006] The duty cycle of the short pulse signal can be determined by experiment, and can be a duty cycle that can make the transmitting power (i.e., signal energy) of the signal transmitting circuit and the power output efficiency reach a high level.

[0007] Optionally, the second end of the inductive module and the controlled end can be the same end.

[0008] Optionally, the second end of the inductive module and the controlled end can be different ends.

[0009] In specific applications, the electrode can also be referred to as an antenna. The electrode can be an electrode in the form of a monopole, a dipole, or other forms.

[0010] The switch module can be a switching device such as a triode, a transistor, a thyristor, or a relay. The transistor can include a metal-oxide-semiconductor field-effect transistor (MOSFET) or an insulated gate bipolar transistor (IGBT), for example.

[0011] The working state of the signal transmitting circuit can include a charging state and a resonance state, which can also be referred to as a radiation state. When the pulse signal is at a high level, the switch module is turned on, and the signal transmitting circuit works in the charging state. When the pulse signal is at a low level, the switch module is turned off, and the signal transmitting circuit works in the resonance state.

[0012] The signal transmitting circuit provided in the embodiment of the present application is configured to set an inductor module, a switch module, a pulse excitation source and an electrode in the signal transmitting circuit, and configure the pulse excitation source to output a short pulse signal to the switch module to control the on-off of the switch module, configure the switch module to be turned on when the short pulse signal is at a high level to short circuit the electrode, so that the direct current power supplies charges the inductor module, and configure the switch module to be turned off when the short pulse signal is at a low level to stop the direct current power from charging the inductor module, and make the inductor module and the electrode form a series resonant network, so that the inductor module radiates the stored electric energy to the outside through the electrode to realize the wireless signal transmitting function. The embodiment of the present application can make the signal transmitting circuit be in the resonant state for a long time by using the short pulse signal to excite the switch module, thereby improving the harmonic suppression level of the signal transmitting circuit, and making the signal transmitting circuit be able to stably emit a high-energy single-frequency signal to the outside. Meanwhile, since the inductor module can limit the growth rate of the current in the path during the charging process, the current flowing through the inductor module will not increase instantaneously, so that the signal transmitting circuit does not need to be configured with a current limiting resistor to avoid the current overload of the direct current power, thereby simplifying the structure of the signal transmitting circuit, reducing the additional loss of the signal transmitting circuit on the current limiting resistor, and improving the electric energy output efficiency of the signal transmitting circuit. In addition, by setting the resonant frequency of the series resonant network as an integer multiple of the frequency of the short pulse signal, the switch module can be in a soft switching state when it is switched from the off state to the on state, thereby reducing the electric energy loss on the switch module and further improving the electric energy output efficiency of the signal transmitting circuit.

[0013] In an optional implementation of the first aspect, the inductor module comprises a first inductor; a first end of the first inductor is the first end of the inductor module, and a second end of the first inductor is the second end and the controlled end of the inductor module.

[0014] In an optional implementation of the first aspect, the inductor module comprises a first inductor and a second inductor; the first inductor and the second inductor are arranged in a positive coupling manner; in the case that a first end of the first inductor and a first end of the second inductor are the same end, the first end of the second inductor is the first end of the inductor module, a second end of the second inductor is the controlled end of the inductor module, the first end of the first inductor is grounded, and the second end of the first inductor is the second end of the inductor module; the switch module is specifically configured to connect the second end of the second inductor to the ground to make the direct current power charge the second inductor when the short pulse signal is at the high level, and the second inductor transmits electric energy to the first inductor in a coupling manner; the switch module is specifically further configured to disconnect the connection between the second end of the second inductor and the ground to make the first inductor and the electrode form a series resonant network when the short pulse signal is at the low level, and the first inductor radiates the stored electric energy to the outside through the electrode.

[0015] According to the signal transmitting circuit provided in the embodiment of the present application, the first inductor and the second inductor coupled are used as the inductive module, and the second inductor only works in the charging state of the signal transmitting circuit and does not participate in the resonance process of the signal transmitting circuit, so that the signal transmitting circuit can realize the decoupling of the resonance frequency control and the transmission power control, and then the transmission power of the signal transmitting circuit can be adjusted by adjusting the inductive reactance value of the second inductor. In addition, since the frequency of the short pulse signal can be any integer multiple of one of the resonance frequency of the series resonance network, the excitation signal of the switch module has higher freedom in the selection of the frequency, thereby expanding the application range of the signal transmitting circuit.

[0016] In an optional implementation of the first aspect, the number of pulse excitation sources, the number of switch modules, and the number of controlled ends of the inductive module are all 2; a first end of a first pulse excitation source is grounded, a second end of the first pulse excitation source is connected with a controlled end of a first switch module, and the first pulse excitation source is configured to output a first short pulse signal to the first switch module to control the on-off of the first switch module; a first conduction end of the first switch module is connected with a first controlled end of the inductive module, and a second conduction end of the first switch module is grounded; the first switch module is configured to connect the first controlled end of the inductive module to the ground when the first short pulse signal is at a high level, so that the inductive module is charged by the DC power supply; and the first switch module is further configured to disconnect the first controlled end of the inductive module from the ground when the first short pulse signal is at a low level, so that the inductive module and the electrode form a series resonance network, and the inductive module radiates the stored electrical energy to the outside through the electrode; a first end of a second pulse excitation source is grounded, and a second end of the second pulse excitation source is connected with a controlled end of a second switch module; the second pulse excitation source is configured to output a second short pulse signal to the second switch module to control the on-off of the second switch module; a first conduction end of the second switch module is connected with a second controlled end of the inductive module, and a second conduction end of the second switch module is grounded; the second switch module is configured to connect the second controlled end of the inductive module to the ground when the second short pulse signal is at a high level, so that the inductive module is charged by the DC power supply; and the second switch module is further configured to disconnect the second controlled end of the inductive module from the ground when the second short pulse signal is at a low level, so that the inductive module and the electrode form a series resonance network, and the inductive module radiates the stored electrical energy to the outside through the electrode.

[0017] In an optional implementation of the first aspect, the inductance module comprises a first inductor, a second inductor, and a third inductor; the first inductor and the second inductor are arranged in a forward coupling manner, and the first inductor and the third inductor are arranged in a reverse coupling manner; a first end of the first inductor, a first end of the second inductor, and a first end of the third inductor are all the same end; a first end of the second inductor and a second end of the third inductor are connected together as a first end of the inductance module, a second end of the second inductor is a first controlled end of the inductance module, the first end of the first inductor is grounded, a second end of the first inductor is a second end of the inductance module, and the first end of the third inductor is a second controlled end of the inductance module; the first switch module is specifically configured to, in a case where the first short pulse signal is at a high level, connect the second end of the second inductor to the ground, so that the DC power source charges the second inductor, and the second inductor transmits electric energy to the first inductor in a coupling manner; the first switch module is specifically further configured to, in a case where the first short pulse signal is at a low level, disconnect the second end of the second inductor from the ground, so that the first inductor and the electrode form a series resonance network, and the first inductor radiates stored electric energy to the outside through the electrode; the second switch module is specifically configured to, in a case where the second short pulse signal is at a high level, connect the first end of the third inductor to the ground, so that the DC power source charges the third inductor, and the third inductor transmits electric energy to the first inductor in a coupling manner; and the second switch module is specifically further configured to, in a case where the second short pulse signal is at a low level, disconnect the first end of the third inductor from the ground, so that the first inductor and the electrode form a series resonance network, and the first inductor radiates stored electric energy to the outside through the electrode.

[0018] In an optional implementation of the first aspect, a coupling coefficient between the first inductor and the second inductor is equal to a coupling coefficient between the first inductor and the third inductor, and an inductive reactance value of the second inductor is equal to an inductive reactance value of the third inductor.

[0019] According to the signal transmitting circuit provided in the embodiments of the present application, by arranging the inductance module in a differential coupling structure, the signal transmitting circuit can improve the transmitting power, ensure stable output of high-energy single-frequency signals, and have the function of suppressing even-numbered harmonics, thereby further improving the harmonic suppression level of the signal transmitting circuit.

[0020] In an optional implementation of the first aspect, the electrode comprises a first capacitor and a first resistor; a first end of the first capacitor is a first end of the electrode, a second end of the first capacitor is connected to a first end of the first resistor, and a second end of the first resistor is a second end of the electrode.

[0021] In an optional implementation of the first aspect, the signal transmitting circuit further comprises a second capacitor; a first end of the second capacitor is configured to be connected to the DC power source, and a second end of the second capacitor is grounded; and the second capacitor is configured to filter out an alternating current component in a direct current signal output by the DC power source.

[0022] The present implementation can filter out the AC component in the DC signal output by the DC power supply by setting the second capacitor capable of providing a ground point for the AC signal in the signal transmitting circuit, thereby reducing unnecessary power loss and further improving the power output efficiency of the signal transmitting circuit.

[0023] In a second aspect, the embodiments of the present application provide a wireless communication module, comprising the signal transmitting circuit according to any one of the implementations of the first aspect.

[0024] In a third aspect, the embodiments of the present application provide an electronic device, comprising a DC power supply and the wireless communication module according to the second aspect.

[0025] It can be understood that the beneficial effects of the second aspect and the third aspect can be referred to the related description in the first aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 An application scenario of a signal transmitting circuit provided by the embodiments of the present application is shown in the figure;

[0027] Figure 2 A structure diagram of a signal transmitting circuit provided by the embodiments of the present application is shown in the figure;

[0028] Figure 3 A structure diagram of a signal transmitting circuit provided by another embodiment of the present application is shown in the figure;

[0029] Figure 4 A circuit principle diagram of a signal transmitting circuit provided by the embodiments of the present application is shown in the figure;

[0030] Figure 5 A comparison diagram of performance indicators of the signal transmitting circuit shown in the figure is shown in the figure; Figure 4

[0031] Figure 6 When a pulse signal with a duty cycle of 50% and 5% is used to excite the switching module, a comparison diagram of performance indicators of the signal transmitting circuit provided by the embodiments of the present application is shown in the figure; Figure 4

[0032] Figure 7 A circuit principle diagram of a signal transmitting circuit provided by another embodiment of the present application is shown in the figure;

[0033] Figure 8 A comparison diagram of performance indicators of the signal transmitting circuit shown in the figure is shown in the figure; Figure 7

[0034] Figure 9 ​​​A second inductance provided in an embodiment of the present application adopts different inductance values, Figure 7 A comparison diagram of various performance indicators of the signal transmitting circuit is shown in FIG. 6.

[0035] Figure 10 A comparison diagram of various performance indicators of the signal transmitting circuit is shown in FIG. 6. Figure 7 A comparison diagram of various performance indicators of the signal transmitting circuit is shown in FIG. 6.

[0036] Figure 11 A comparison diagram of various performance indicators of the signal transmitting circuit is shown in FIG. 6. Figure 7 A comparison diagram of various performance indicators of the signal transmitting circuit is shown in FIG. 6.

[0037] Figure 12 A circuit structure of a signal transmitting circuit provided in another embodiment of the present application is shown in FIG. 8.

[0038] Figure 13 A comparison diagram of various performance indicators of the signal transmitting circuit is shown in FIG. 6. Figure 12 A comparison diagram of various performance indicators of the signal transmitting circuit is shown in FIG. 6.

[0039] Figure 14 A comparison diagram of various performance indicators of the signal transmitting circuit is shown in FIG. 6. Figure 12 A comparison diagram of various performance indicators of the signal transmitting circuit is shown in FIG. 6.

[0040] Figure 15 A structure diagram of a communication module provided in an embodiment of the present application is shown in FIG. 10.

[0041] Figure 16 A structure diagram of an electronic device provided in an embodiment of the present application is shown in FIG. 12. DETAILED DESCRIPTION

[0042] It should be noted that the terms used in the implementation manner part of the embodiments of the present application are only used for explaining the specific embodiments of the present application, and are not intended to limit the present application. In the description of the embodiments of the present application, unless otherwise specified, “ / ” represents or, for example, A / B can represent A or B; “and / or” in this article only describes the association relationship of the association, which means that there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, in the description of the embodiments of the present application, unless otherwise specified, “multiple” means two or more than two, “at least one” and “one or more” means one, two or more than two.

[0043] The terms "first", "second", etc. are used herein only to describe different instances, and cannot be construed to refer to a relative importance or to imply the number of the indicated technical features. Thus, the definition of "first", "second" features can explicitly or implicitly include one or more of the features.

[0044] In this specification, the phrase "one embodiment" or "some embodiments" etc. means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Thus, the occurrences of the phrases "in one embodiment", "in some embodiments", "in other embodiments", "in additional embodiments", etc. in various places in the specification are not necessarily all referring to the same embodiment, but can mean "one or more but not all embodiments", unless otherwise specifically stated. The terms "comprising", "containing", "having" and their conjugates mean "including but not limited to", unless otherwise specifically stated.

[0045] With the continuous development of mobile communication technology, electronic devices such as mobile phones, tablets, etc. are usually configured with a wireless communication module. The wireless communication module usually includes a signal transmitting circuit, and the electronic device can transmit wireless signals to the outside through the signal transmitting circuit to realize wireless communication with other devices, or realize touch point recognition function of the touch screen of the electronic device, etc.

[0046] Exemplarily, please refer to Figure 1 , which is an application scenario diagram of a signal transmitting circuit provided by an embodiment of the application. Taking a mobile phone as an example, as shown in (a) of Figure 1 , in a near field communication (such as mobile payment or mobile identity authentication, etc.) scenario, the mobile phone can transmit wireless signals to other near field communication (NFC) devices through the signal transmitting circuit to realize point-to-point communication with other NFC devices. As shown in (b) of Figure 1 , in a touch point recognition scenario of the touch screen of the mobile phone, in order to avoid the interference of water droplets and other factors on touch point recognition, the signal transmitting circuit can be arranged on the back plate of the mobile phone, and the mobile phone can transmit wireless signals to the outside through the signal transmitting circuit on the back plate. Based on this, when the user's finger contacts the screen of the mobile phone, the finger will conduct the wireless signals transmitted by the signal transmitting circuit, and the signal receiver on the cover plate of the mobile phone can recognize the signals conducted by the finger to realize the recognition of the touch point of the finger.

[0047] In either of the above near field communication scenarios or the touch point recognition scenarios of the touch screen, the signal transmitting circuit is required to stably transmit a single frequency signal outward, so as to ensure the stability of the wireless communication of the electronic device or the accuracy and stability of the touch point recognition of the electronic device. In addition, with the development of miniaturization of the electronic device, the space available for the wireless communication module in the electronic device is smaller and smaller, and therefore the signal transmitting circuit is also required to have a smaller size. However, the structure of the signal transmitting circuit in the related art is relatively complex, which leads to a large overall size of the signal transmitting circuit, and is not conducive to the miniaturization design of the signal transmitting circuit. In addition, the harmonic suppression level of the signal transmitting circuit in the related art is low, which leads to a large number of harmonic components in the signal transmitted by the signal transmitting circuit, i.e. the electronic device cannot stably transmit a single frequency signal outward, thereby reducing the stability of the wireless communication of the electronic device or the accuracy and stability of the touch point recognition of the electronic device.

[0048] Therefore, the embodiments of the present application provide a signal transmitting circuit, a wireless communication module and an electronic device. The signal transmitting circuit comprises an inductor module, a switch module, a pulse excitation source and an electrode. The pulse excitation source is configured to output a short pulse signal to the switch module to control the on-off of the switch module. The switch module is configured to be turned on when the short pulse signal is at a high level, so as to short circuit the electrode, and the direct current power supplies the inductor module with electricity. The switch module is configured to be turned off when the short pulse signal is at a low level, so as to stop the direct current power from charging the inductor module, and the inductor module and the electrode form a series resonant network. Thus, the inductor module radiates the stored electrical energy outward through the electrode, and realizes the function of transmitting wireless signals. The embodiments of the present application can make the signal transmitting circuit be in a resonant state for a long time by using the short pulse signal to excite the switch module, thereby improving the harmonic suppression level of the signal transmitting circuit, and making the signal transmitting circuit stably transmit a single frequency signal with high energy outward. At the same time, since the inductor module limits the growth rate of the current in the path during the charging process, the current flowing through the inductor module will not increase instantaneously, so that the signal transmitting circuit does not need to be provided with a current limiting resistor to avoid the current overload of the direct current power. In this way, the structure of the signal transmitting circuit is simplified, the additional loss of the signal transmitting circuit on the current limiting resistor is reduced, and the electrical energy output efficiency of the signal transmitting circuit is improved. In addition, by setting the resonant frequency of the series resonant network to be an integer multiple of the frequency of the short pulse signal, the switch module can be in a soft switching state when it is switched from the off state to the on state, thereby reducing the electrical energy loss of the switch module and further improving the electrical energy output efficiency of the signal transmitting circuit.

[0049] The signal transmitting circuit provided by the embodiments of the present application can also be referred to as an active resonant circuit or an active integrated antenna, etc. The structure and working principle of the signal transmitting circuit provided by the embodiments of the present application will be described in detail below.

[0050] Referring to Figure 2 , a structural schematic diagram of a signal transmitting circuit 10 is provided in the embodiments of the present application. As shown in Figure 2 , in some embodiments, the signal transmitting circuit 10 can include an inductive module 11, a switching module 12, a pulse excitation source 13, and an electrode 14.

[0051] The inductive module 11 can have a first end a, a second end b, and a controlled end c. The first end a of the inductive module 11 can be used to connect a direct current power supply 20, so that in some scenarios, the inductive module 11 can obtain a direct current signal from the direct current power supply 20 to store electric energy; the second end b of the inductive module 11 can be connected with a first end d of the electrode 14, and a second end e of the electrode 14 can be grounded, so that in other scenarios, the inductive module 11 can form a series resonant network with the electrode 14, so that the inductive module 11 can radiate the stored electric energy to the outside through the electrode 14, realizing the function of wireless signal transmission.

[0052] Exemplarily, the inductive module 11 can include one or more inductive elements. For example, in the case where the inductive module 11 includes one inductive element, the first end of the inductive element can be used as the first end a of the inductive module 11, and the second end of the inductive element can be used as the second end b or the controlled end c of the inductive module 11, i.e., in the case where the inductive module 11 includes one inductive element, the second end b and the controlled end c of the inductive module 11 can be the same end. For another example, in the case where the inductive module 11 includes multiple inductive elements coupled, the second end b and the controlled end c of the inductive module 11 can be different ends.

[0053] The electrode 14 can be referred to as an antenna. Exemplarily, the electrode 14 can be a monopole electrode, a dipole electrode, or other forms of electrodes, and the embodiments of the present application do not particularly limit the specific form of the electrode 14.

[0054] The pulse excitation source 13 can have a first end f and a second end g. The first end f of the pulse excitation source 13 can be grounded, and the second end g of the pulse excitation source 13 can be connected with a controlled end h of the switching module 12. The pulse excitation source 13 can be used to output a pulse signal to the switching module 12 to control the on-off of the switching module 12, thereby controlling the working state of the signal transmitting circuit 10.

[0055] Exemplarily, the working states of the signal transmitting circuit 10 can include a charging state and a resonance state, and the resonance state can also be referred to as a radiation state. Specifically, when the pulse signal is at a high level, the switch module 12 can be turned on, and at this time, the signal transmitting circuit 10 works in the charging state; when the pulse signal is at a low level, the switch module 12 can be turned off, and at this time, the signal transmitting circuit 10 works in the resonance state. In some embodiments, the pulse excitation source 13 can output a short pulse signal with a duty cycle less than a preset duty cycle threshold to the switch module 12. The preset duty cycle threshold can be set according to the actual application scenario. Exemplarily, the duty cycle of the short pulse signal can be a duty cycle that can make the transmission power (i.e., signal energy) and the power output efficiency of the signal transmitting circuit 10 reach a high level, which is measured by experiment.

[0056] The switch module 12 can also have a first conduction end j and a second conduction end k. The first conduction end j of the switch module 12 can be connected with the controlled end c of the inductive module 11, and the second conduction end k of the switch module 12 can be grounded. The switch module 12 can be used to connect the controlled end c of the inductive module 11 to the ground when the short pulse signal is at a high level, so as to short-circuit the electrode 14 and enable the direct current power supply 20 to charge the inductive module 11. The switch module 12 can also be used to disconnect the connection between the controlled end c of the inductive module 11 and the ground when the short pulse signal is at a low level, so as to enable the direct current power supply 20 to stop charging the inductive module 11 and enable the inductive module 11 and the electrode 14 to form a series resonance network, thereby enabling the inductive module 11 to radiate the stored power to the outside through the electrode 14 and realize the wireless signal transmitting function. It can be understood that, since the inductive module 11 limits the growth rate of the current in the path in which it is located during the charging process, the current flowing through the inductive module 11 will not instantaneously increase but gradually increase according to an exponential curve during the charging process of the inductive module 11. Therefore, without a current limiting resistor in the signal transmitting circuit 10, the current overload of the direct current power supply 20 can be avoided, which not only reduces the complexity of the circuit structure, but also reduces the additional loss of the signal transmitting circuit 10 on the current limiting resistor and improves the power output efficiency of the signal transmitting circuit 10.

[0057] In the embodiments of the present application, the resonance frequency of the series resonance network formed by the inductive module 11 and the electrode 14 can be an integer multiple of the frequency of the short pulse signal. In this way, not only can the inductive module 11 and the electrode 14 resonate and realize the transmission of wireless signals when the short pulse signal is at a low level, but also the switch module 12 can be in a soft switching state when it is switched from the off state to the on state, thereby reducing the power loss on the switch module and further improving the power output efficiency of the signal transmitting circuit.

[0058] The resonant frequency of the series resonant network can be determined by the inductive reactance of the inductor module 11 and the capacitive reactance of the electrode 14. That is, in specific applications, the resonant frequency of the series resonant network can be adjusted by adjusting the inductive reactance of the inductor module 11 and / or the capacitive reactance of the electrode 14, so that the resonant frequency of the series resonant network is an integer multiple of the frequency of the short pulse signal.

[0059] Please see Figure 3 This is a schematic diagram of the structure of a signal transmitting circuit 10 provided in another embodiment of this application. Figure 3 As shown, in some other embodiments, the signal transmitting circuit 10 may also include a filter capacitor 15.

[0060] The filter capacitor 15 may have a first terminal m and a second terminal n. The first terminal m of the filter capacitor 15 can be used to connect to the DC power supply 20, and the second terminal n of the filter capacitor 15 can be grounded.

[0061] The filter capacitor 15 can be used to provide a return point for the AC signal to filter out the AC component in the DC signal output by the DC power supply 20, thereby reducing unnecessary power loss and further improving the power output efficiency of the signal transmitting circuit 10.

[0062] Please see Figure 4 This is a schematic diagram of the circuit principle of a signal transmitting circuit 10 provided in an embodiment of this application. Figure 4 As shown, in one specific implementation, electrode 14 may include a first resistor R. ant and the first capacitor C ant First capacitor C ant The first end can be used as the first end d of electrode 14, and the first capacitor C ant The second terminal can be connected to the first resistor R ant The first end is connected to the first resistor R. ant The second end can be used as the second end e of electrode 14.

[0063] For example, the switching module 12 can be a switching device such as a transistor, a thyristor, or a relay. Transistors may include, for example, metal-oxide-semiconductor field-effect transistors (MOSFETs) or insulated-gate bipolar transistors (IGBTs).

[0064] For example, taking switch module 12 as an example Figure 4Taking the relay shown as an example, the positive terminal (+) of the relay coil can be used as the controlled terminal h of the switch module 12, the negative terminal (-) of the relay coil can be connected to the normally open contact of the relay and used as the second conducting terminal k of the switch module 12, and the common contact of the relay can be used as the first conducting terminal j of the switch module 12.

[0065] For example, taking the switch module 12 as an NPN transistor (not shown), the base of the NPN transistor can be used as the controlled terminal h of the switch module 12, the collector of the NPN transistor can be used as the first conducting terminal j of the switch module 12, and the emitter of the NPN transistor can be used as the second conducting terminal k of the switch module 12.

[0066] Filter capacitor 15 may include a second capacitor C d The second capacitor C d The first terminal can be used as the first terminal m of the filter capacitor 15, and the second capacitor C d The second end can be used as the second end n of the filter capacitor 15.

[0067] In one alternative implementation, the inductor module 11 may include a first inductor L. res First inductor L res The first terminal can be used as the first terminal a of the inductor module 11, and the first inductor L res The second terminal can serve as both the second terminal b and the controlled terminal c of the inductor module 11. Based on this, please refer to... Figure 5 ,for Figure 4 The diagram shows the equivalent circuit of the signal transmitting circuit 10 under different operating conditions. Figure 5 (a) in the middle is Figure 4 The diagram shows the equivalent circuit of the signal transmitting circuit 10 in the charging state. Figure 5 (b) in the middle is Figure 4 The equivalent circuit diagram of the signal transmitting circuit 10 in the resonant state is shown.

[0068] like Figure 5 As shown in (a), when the short pulse signal is high, the switching module 12 is in the on state, and at this time the first inductor L res By grounding the switch module 12, electrode 14 is short-circuited, and the DC power supply 20 supplies power to the first inductor L. res Charging is in progress; that is, the signal transmitting circuit 10 is currently in a charging state. For example... Figure 5 As shown in (b), when the short pulse signal is low, the switch module 12 is in the off state, and at this time, the electrode 14 participates in the operation of the signal transmitting circuit 10, and the first inductor L res The first capacitor C in electrode 14 antresonate and form a series resonance network, so that the first inductor L res The stored electrical energy is radiated outwardly through the electrode 14, i.e., at this time the signal transmitting circuit 10 is in a resonant state.

[0069] To further illustrate the beneficial effects brought by the short pulse signal used to excite the switch module 12 in the embodiments of the present application, the following takes the duty cycle of the pulse signal as 50% and 5% as examples to exemplarily illustrate the excitation of the switch module 12 by the pulse signals with different duty cycles, Figure 4 the performance indicators of the signal transmitting circuit 10 shown.

[0070] Please refer to Figure 6 , Figure 6 the excitation of the switch module 12 by the pulse signals with duty cycles of 50% and 5% respectively provided in the embodiments of the present application, Figure 4 the comparison diagram of the performance indicators of the signal transmitting circuit 10 shown. Among them, Figure 6 (a), (c) and (e) in the figure are respectively the waveform diagram of the voltage V ant on the electrode 14, the waveform diagram of the current I res flowing through the first inductor L ind and the spectrum diagram of the output power of the signal transmitting circuit 10 when the switch module 12 is excited by the pulse signal with a duty cycle of 50%; Figure 6 (b), (d) and (f) in the figure are respectively the waveform diagram of the voltage V ant on the electrode 14, the waveform diagram of the current I res flowing through the first inductor L ind and the spectrum diagram of the output power of the signal transmitting circuit 10 when the switch module 12 is excited by the pulse signal with a duty cycle of 5%. Among them, the voltage V ant on the electrode 14 can refer to the voltage of the first end d of the electrode 14. It can be understood that, since the switch module 12 in this implementation mode is connected in parallel across the two ends of the electrode 14, the voltage V ant on the electrode 14 can also be regarded as the voltage on the switch module 12. The voltage on the switch module 12 can refer to the voltage of the first conduction end j of the switch module 12.

[0071] Exemplarily, it is assumed that the frequency of the pulse signal with a duty cycle of 50% and the frequency of the pulse signal with a duty cycle of 5% are both 10 megahertz (MHz), the first inductor L res and the first capacitor C ant can resonate at 10 MHz, the first inductor L resThe inductive reactance is 13.75 microhenries (μH). Therefore, taking the first period of the pulse signal (i.e., the time interval from 0 to 100 nanoseconds (ns)) as an example, with a pulse signal duty cycle of 50%, if... Figure 6 As shown in (a) or (c), during the period from 0 to 50 ns, the pulse signal is at a high level. During this time, the signal transmitting circuit 10 is in a charging state, electrode 14 is short-circuited, and the DC power supply 20 supplies power to the first inductor L. res Charging is initiated. Due to the first inductor L res This will limit the rate of current growth in the path it is in; therefore, during the time period of 0–50 ns, the current flowing through the first inductor L… res The current gradually increases over time. During the period of 50 to 100 ns, the pulse signal is at a low level. At this time, the signal transmitting circuit 10 is in a resonant (radiation) state, and the first inductor L... res With the first capacitor C ant To form a series resonant network, the first inductor L res To the first capacitor C ant Discharge.

[0072] like Figure 6 As shown in (a), during the time period from 0 to 50 ns, the voltage V on electrode 14 is V because electrode 14 is short-circuited. ant It remains at 0 volts (V). During the 50–100 ns period, due to the first inductance L… res With the first capacitor C ant Resonance occurs, resulting in a resonant voltage on electrode 14. It is understandable that when the switching module 12 is excited using a pulse signal with a 50% duty cycle, the signal transmitting circuit 10 is in a resonant state for a short period, thus causing a voltage V on electrode 14. ant A cutoff effect occurs, which in turn causes the voltage V on electrode 14 to decrease. ant The waveform is as follows Figure 6 The incomplete curve shown in (a) shows that the voltage V on electrode 14... ant The waveform contains a large number of harmonic components. Combined with... Figure 6 As shown in (e), stimulating the switching module 12 with a pulse signal with a 50% duty cycle results in the signal transmitting circuit 10 transmitting power at multiple frequency points, with the highest transmission power occurring at the frequency point where electrode 14 can independently resonate (around 70MHz). The frequency point where electrode 14 can independently resonate can be understood as the fundamental resonant frequency of electrode 14. Therefore, it is evident that with a 50% duty cycle for the pulse signal, the signal transmitting circuit 10 cannot output a single-frequency signal.

[0073] likeFigure 6 As shown in (b) or (d), when the duty cycle of the pulse signal is 5%, the pulse signal is high-level during the 0-5ns period and low-level during the 5-100ns period. This causes the signal transmitting circuit 10 to be in a charging state only during the 0-5ns period, while it remains in a resonant state during the 5-100ns period. Therefore, using a short pulse signal with a 5% duty cycle to excite the switching module 12 ensures that the signal transmitting circuit 10 is in a resonant state for most of the time, thus generating a relatively complete resonant voltage on the electrode 14, i.e., as shown in (b) or (d). Figure 6 As shown in (b), the voltage V on electrode 14 ant The waveform is a relatively complete resonance curve. Combined with... Figure 6 As shown in (f), when the duty cycle of the pulse signal is 5%, the signal transmitting circuit 10 can achieve a transmission power of -13.7 dBm at a single frequency point (i.e., around 10MHz). The harmonic suppression level of the signal transmitting circuit 10 reaches 20.6 dB. In other words, using a short pulse signal with a duty cycle of 5% to excite the switching module 12 can improve the harmonic suppression level of the signal transmitting circuit 10, enabling the signal transmitting circuit 10 to stably transmit a single-frequency signal.

[0074] In addition, according to Figure 6 As shown in (b), when the duty cycle of the pulse signal is 5% and the frequency of the pulse signal is equal to the resonant frequency of the series resonant network, the voltage V on electrode 14 will change when the switching module 12 switches from the off state to the on state. ant The waveform of (i.e., the voltage on switch module 12) just crosses zero, and the voltage V on electrode 14... ant The rate of change with time is 0, thus enabling the switching module 12 to be in a soft-switching state. This means that switching the state of the switching module 12 does not cause additional power loss in the circuit, thereby further improving the power output efficiency of the signal transmitting circuit 10. When the switching module 12 switches from the on state to the off state, the voltage V on electrode 14... ant The waveform recovers to a complete resonance curve, thus enabling the signal transmitting circuit 10 to maintain a high harmonic suppression level. It is evident that the embodiment of this application uses a short pulse signal with a duty cycle of 5% to excite the switching module 12, which not only enables the signal transmitting circuit 10 to have a high harmonic suppression level and stably output a single-frequency signal, but also improves the power output efficiency of the signal transmitting circuit 10.

[0075] In another optional implementation, in order to further adjust the transmitting power of the signal transmitting circuit 10, the transmitting power of the signal transmitting circuit 10 is increased, and another implementation of the inductance module 11 is provided. Please refer to Figure 7 , a circuit structure of the signal transmitting circuit 10 provided by another embodiment of the present application.

[0076] As Figure 7 shown, in another optional implementation, the inductance module 11 can include a first inductance L res and a second inductance L m . Wherein, the first inductance L res and the second inductance L m are arranged in a same direction coupling manner, and the coupling coefficient of the first inductance L res and the second inductance L m may be K, and the size of K can be set according to actual requirements, for example, K can be 0.6.

[0077] Exemplarily, assuming that the first end of the second inductance L m and the first end of the second inductance L m are both the same name end, then the first end of the second inductance L m may be used as the first end a of the inductance module 11, the second end of the second inductance L m may be used as the controlled end c of the inductance module 11, the first end of the first inductance L res may be grounded, and the second end of the first inductance L res may be used as the second end b of the inductance module 11. The second inductance L m may be used to store electrical energy when the signal transmitting circuit 10 is in a charging state, and transfer electrical energy to the first inductance L res through coupling. The first inductance L res may be used to form a series resonance network with the electrode 14 when the signal transmitting circuit 10 is in a resonance state, so that the first inductance L res radiates the stored electrical energy to the outside through the electrode 14, realizing the function of wireless signal transmission.

[0078] Exemplarily, please refer to Figure 8 , the equivalent circuit schematic diagram of the signal transmitting circuit 10 in different working states is shown in Figure 7 . Among them, Figure 8 (a) in Figure 7 is the equivalent circuit schematic diagram of the signal transmitting circuit 10 in a charging state, Figure 8 (b) in Figure 7 is the equivalent circuit schematic diagram of the signal transmitting circuit 10 in a resonance state.

[0079] As Figure 8As shown in (a), when the short pulse signal is high, the switching module 12 is in the on state, and at this time the second inductor L m The DC power supply 20 is connected to the second inductor L via grounding through the switching module 12. m Charging is in progress; that is, the signal transmitting circuit 10 is in a charging state at this time. This is due to the first inductor L... res With the second inductor L m There is a coupling relationship between them, therefore the second inductor L m While storing electrical energy, it will be coupled to the first inductor L. res Transfer electrical energy, thereby enabling the first inductor L res It also stores electrical energy. For example... Figure 8 As shown in (b), when the short pulse signal is low, the switching module 12 is in the off state, and at this time the first inductor L res The first capacitor C in electrode 14 ant This forms a series resonant network, making the first inductor L res The stored electrical energy is radiated outward through electrode 14, that is, the signal transmitting circuit 10 is in a resonant state at this time.

[0080] In this implementation, due to the second inductor L m It only operates in the charging state of the signal transmitting circuit 10 and does not participate in the resonance process of the signal transmitting circuit 10. Therefore, it is possible to adjust the second inductor L without affecting the series resonant network. m The inductive reactance is used to adjust the current flowing through the second inductor L. m The magnitude of the current is used to adjust the transmission power of the signal transmitting circuit 10. Specifically, the second inductor L... m The smaller the inductive reactance, the weaker its ability to limit the current growth rate in the path, and the higher the transmission power of the signal transmitting circuit 10.

[0081] To further illustrate the relationship between the transmission power of the signal transmitting circuit 10 and the second inductor L m The relationship between inductive reactance values ​​is discussed below using the second inductor L as an example. m Taking the inductive reactance values ​​of 0.2μH and 0.05μH as examples, for the second inductor L... m The performance indicators of the signal transmitting circuit 10 are compared when different inductive reactance values ​​are used.

[0082] Please see Figure 9 A second inductor L provided in the embodiments of this application m A comparative diagram showing the performance indicators of the signal transmitting circuit 10 under different inductive reactance values. Among them, Figure 9 (a) in the figure represents the second inductance L. m With an inductive reactance of 0.2 μH, the current flowing through the second inductor Lm Current I ind A waveform diagram; Figure 9 (b) in the figure represents the second inductor L. m With an inductive reactance of 0.05 μH, the current flowing through the second inductor L m Current I ind A waveform diagram; Figure 9 (c) in the figure represents the second inductance L. m A schematic diagram of the spectrum of the output power of the signal transmitting circuit 10 when the inductive reactance is 0.2μH; Figure 9 (d) in the figure represents the second inductance L. m A schematic diagram of the transmission power spectrum of the signal transmitting circuit 10 when the inductive reactance is 0.05μH.

[0083] like Figure 9 As shown in (a) and (b), when the second inductor L m When the inductive reactance decreases from 0.2 μH to 0.05 μH, the current flowing through the second inductor L... m The maximum current increased from 20 mA to 76 mA, because with the increase in the second inductor L... m The decrease in inductive reactance, the second inductor L m The ability to limit the current growth rate in its path is weakened, thus reducing the current flowing through the second inductor L. m The maximum current increases. Correspondingly, such as Figure 9 As shown in (c) and (d) in the figure, when the second inductor L m When the inductive reactance decreases from 0.2μH to 0.05μH, the transmit power of the signal transmitting circuit 10 at a frequency of 10MHz increases from 8.8dBm to 14.8dBm. It can be seen that as the inductive reactance of the second inductor L decreases... m The decrease in inductive reactance increases the transmission power of the signal transmitting circuit 10. Furthermore, regardless of the second inductor L... m Whether the inductive reactance is 0.2μH or 0.05μH, the signal transmitting circuit 10 can achieve a harmonic suppression level exceeding 39dB. It is evident that the introduction of the coupling inductor enables the signal transmitting circuit 10 to decouple resonant frequency control from transmit power control. Therefore, by changing the second inductor L... m The inductive reactance value can adjust the transmission power of the signal transmitting circuit 10 without affecting the harmonic suppression level of the signal transmitting circuit 10.

[0084] To further illustrate the first inductor L used in this implementation, which is coupled together... res With the second inductor L mAs a result of the beneficial effects of inductor module 11, the following assumes that the duty cycle of the short pulse signal is 5%, the frequency of the short pulse signal is 10MHz, and the first inductor L... res With the first capacitor C ant Resonance is generated at 10MHz, and the second inductor L m The inductive reactance is 0.1 μH, and the first inductor L res Taking an impedance value of 13.75 μH as an example, this is an illustrative illustration. Figure 7 The performance indicators of the signal transmitting circuit 10 shown are as follows.

[0085] Please see Figure 10 ,for Figure 7 The diagram shows the performance specifications of the signal transmitting circuit 10. Among them, Figure 10 (a) in the middle is Figure 7 The voltage V on electrode 14 in the signal transmitting circuit 10 shown ant A waveform diagram; Figure 10 (b) in the middle is Figure 7 The voltage V on the switching module 12 in the signal transmitting circuit 10 shown is... s A waveform diagram; Figure 10 (c) in the middle is Figure 7 The signal transmitting circuit 10 shown contains the second inductor L. m Current I ind A waveform diagram; Figure 10 (d) in the middle is Figure 7 The spectrum diagram of the output power of the signal transmitting circuit 10 shown.

[0086] according to Figure 10 As shown in (a), without changing the first inductance L res In the case of inductive reactance, by using the second inductor L m The inductive reactance is set to 0.1 μH, which enables a resonant voltage with an amplitude of 189 V to be generated on electrode 14. Meanwhile, according to... Figure 10 As shown in (b), the voltage V on switch module 12 is... s The maximum amplitude can be limited to 20V. Therefore, this implementation increases the voltage V on electrode 14. ant At the same time, it will not increase the voltage V on the switching module 12. s Therefore, higher requirements will not be placed on the withstand voltage capability of the switch module 12. Furthermore, according to... Figure 10 As shown in (c), with the second inductor L m The inductive reactance value decreased significantly, and the current flowing through the second inductor L m Current I ind This has been significantly improved, thus increasing the transmission power of the signal transmitting circuit 10. According to...Figure 11 As shown in (d) above, this implementation allows the signal transmitting circuit 10 to achieve a transmission power of 11.8 dBm at a single frequency (around 10 MHz), and the harmonic suppression level of the signal transmitting circuit 10 reaches 44.9 dB. Therefore, this implementation, by introducing a coupling inductor, can decouple the resonant frequency control and transmission power control of the signal transmitting circuit 10, thereby allowing adjustment of the second inductor L... m The inductive reactance value is used to adjust the transmission power of the signal transmitting circuit 10.

[0087] Furthermore, since the frequency of the short pulse signal can be any integer multiple of the resonant frequency of the series resonant network, the excitation signal of the switching module 12 has greater freedom in frequency selection, expanding the applicability of the signal transmitting circuit 10. The following example, using a resonant frequency of 10MHz for the series resonant network and short pulse signal frequencies of 1 / 4 and 1 / 10 of the resonant frequency, further illustrates the impact of using short pulse signals of different frequencies on various performance indicators of the signal transmitting circuit 10. Please refer to... Figure 11 This is a schematic diagram comparing various performance indicators of the signal transmitting circuit 10 when using short pulse signals of different frequencies as excitation signals, as provided in an embodiment of this application. Figure 7 In the diagram, (a) and (c) represent the short pulse signal with a frequency of 1 / 4 of the resonant frequency, respectively. Figure 11 The voltage V on electrode 14 in the signal transmitting circuit 10 shown ant The waveform diagram and the spectrum diagram of the output power of the signal transmitting circuit 10; Figure 7 In the diagram, (b) and (d) represent the short pulse signal with a frequency of 1 / 10 of the resonant frequency, respectively. Figure 11 The voltage V on electrode 14 in the signal transmitting circuit 10 shown ant The waveform diagram and the spectrum diagram of the transmission power of the signal transmitting circuit 10 are shown.

[0088] according to Figure 11 From (a) and (c), it can be seen that when the frequency of the short pulse signal is 1 / 4 of the resonant frequency (i.e., 2.5MHz), the voltage V on electrode 14 is... ant The amplitude is 158V, the transmission power of the signal transmitting circuit 10 at a frequency of 10MHz is 10.2dBm, and the signal transmitting circuit 10 has a harmonic suppression level of 34.9dB. According to... Figure 12 From (b) and (d) in the figure, it can be seen that when the frequency of the short pulse signal is 1 / 10 of the resonant frequency (i.e., 1MHz), the voltage V on electrode 14 is antThe amplitude of the signal is 119V, the transmitting power of the signal transmitting circuit 10 at the frequency of 10MHz is 7.7dBm, and the signal transmitting circuit 10 has a harmonic suppression level of 34.7dB. As can be seen, when the frequency of the short pulse signal decreases, the transmitting power of the signal transmitting circuit 10 decreases, but the harmonic suppression level is maintained at a high level. Therefore, the present embodiment only needs to ensure that the frequency of the short pulse signal is any integer multiple of one of the resonant frequencies of the series resonant network, so that the signal transmitting circuit 10 can stably output a single-frequency signal with a high harmonic suppression level, and the degree of freedom of the frequency selection of the short pulse signal is improved.

[0089] In another embodiment of the present application, in order to achieve the suppression of even harmonics and further improve the harmonic suppression level of the signal transmitting circuit 10, another signal transmitting circuit is provided in the present embodiment. Please refer to Figure 12 The circuit structure of a signal transmitting circuit 10 provided in another embodiment of the present application is shown in FIG. 4. As shown in FIG. 4, in another optional implementation, the number of pulse excitation sources 13, the number of switch modules 12, and the number of controlled ends c of the inductor module 11 in the signal transmitting circuit 10 can all be 2. It should be noted that in the present embodiment, the frequencies of the pulse signals output by all pulse excitation sources 13 are the same, and the duty cycles of the pulse signals output by all pulse excitation sources 13 are the same. In addition, the performances of all switch modules 12 are the same. Figure 13

[0090] In the present embodiment, each pulse excitation source 13 can have a first end f and a second end g, and each switch module 12 can have a controlled end h, a first conduction end j, and a second conduction end k.

[0091] The first end f of the first pulse excitation source 13 can be grounded, and the second end g of the first pulse excitation source 13 can be connected to the controlled end h of the first switch module 12. The first pulse excitation source 13 can be used to output a first short pulse signal to the first switch module 12 to control the on-off of the first switch module 12.

[0092] The first conduction end j of the first switch module 12 can be connected to the first controlled end c of the inductor module 11, and the second conduction end h of the first switch module 12 can be grounded. The first switch module 12 can be used to connect the first controlled end c of the inductor module 11 to the ground when the first short pulse signal is at a high level, so that the DC power supply 20 charges the inductor module 11. The first switch module 12 can also be used to disconnect the first controlled end c of the inductor module 11 from the ground when the first short pulse signal is at a low level, so that the inductor module 11 forms a series resonant network with the electrode 14, and the inductor module 11 radiates the stored electrical energy to the outside through the electrode 14.

[0093] ​The first end f of the second pulse excitation source 13 can be grounded, and the second end g of the second pulse excitation source 13 can be connected with the controlled end h of the second switch module 12. The second pulse excitation source 13 can be used to output a second short pulse signal to the second switch module 12 to control the on-off of the second switch module 12.

[0094] The first conduction end j of the second switch module 12 can be connected with the second controlled end c of the inductor module 11, and the second conduction end h of the second switch module 12 can be grounded. The second switch module 12 can be used to connect the second controlled end c of the inductor module 11 to the ground when the second short pulse signal is high, so that the DC power supply 20 charges the inductor module 11; the second switch module 12 can also be used to disconnect the connection between the second controlled end c of the inductor module 11 and the ground when the second short pulse signal is low, so that the inductor module 11 and the electrode 14 form a series resonant network, and the inductor module 11 stores the electrical energy and radiates it outward through the electrode 14.

[0095] In a specific implementation, the inductor module 11 can include a first inductor L res , a second inductor L m , and a third inductor L n . The first inductor L res is arranged in the same direction with the second inductor L m , the first inductor L res is arranged in the opposite direction with the second inductor L m , and the coupling coefficient of the first inductor L res and the second inductor L m is equal to the coupling coefficient of the first inductor L res and the third inductor L n , and the inductive reactance value of the second inductor L m is equal to the inductive reactance value of the third inductor L n .

[0096] For example, assuming that the first end of the first inductor L res , the first end of the second inductor L m , and the first end of the third inductor L n are all the same end, the first end of the second inductor L m can be connected with the second end of the third inductor L n and serve as the first end a of the inductor module 11, the second end of the second inductor L m can serve as the first controlled end c of the inductor module 11, the first end of the third inductor L n can serve as the second controlled end c of the inductor module 11, and the first end of the first inductor L res can be grounded, and the first end of the first inductor L resThe second end can be used as the second end b of the inductor module 11.

[0097] The first switching module 12 is specifically used to switch the second inductor L when the first short pulse signal is high. m The second terminal is connected to ground, so that the DC power supply 20 is connected to the second inductor L. m Charging, the second inductor L m Through coupling to the first inductor L res Transmitting electrical energy. Specifically, the first switching module 12 is also used to disconnect the second inductor L when the first short pulse signal is low. m The connection between the second terminal and ground makes the first inductor L res The first inductor L forms a series resonant network with electrode 14. res The stored electrical energy is radiated outward through electrode 14.

[0098] The second switching module 12 is specifically used to switch the third inductor L when the second short pulse signal is high. m The first terminal is connected to ground, so that the DC power supply 20 is connected to the third inductor L. m Charging, third inductor L m Through coupling to the first inductor L res The second switching module 12 is also specifically used to disconnect the third inductor L when the second short pulse signal is low. m The connection between the first terminal and ground makes the first inductor L res The first inductor L forms a series resonant network with electrode 14. res The stored electrical energy is radiated outward through electrode 14.

[0099] Please see Figure 12 ,for Figure 13 The diagram shows the equivalent circuit of the signal transmitting circuit under different operating conditions. For example, Figure 12 (a) in the middle is Figure 13 The diagram shows the equivalent circuit of the signal transmitting circuit 10 in the charging state. Figure 12 (b) in the middle is Figure 13 The equivalent circuit diagram of the signal transmitting circuit 10 in the resonant state is shown.

[0100] like Figure 13 As shown in (a), when the short pulse signal output by the first pulse excitation source 13 is at a high level, the first switching module 12 is in the on state. At this time, the second inductor L... m The second terminal is connected to ground through the first switch module 12, so that the DC power supply 20 is connected to the second inductor L. mCharging is performed. When the short pulse signal output by the second pulse excitation source 13 is at a high level, the second switch module 12 is in the conducting state. At this time, the third inductor L... n The first terminal is connected to ground via the second switch module 12, enabling the DC power supply 20 to supply power to the third inductor L. n Charging is in progress; that is, the signal transmitting circuit 10 is currently in a charging state. This is understandable because of the second inductor L... m With the first inductor L res The coupling relationship with the third inductor L n With the first inductor L res The coupling relationship is opposite; therefore, when the signal transmitting circuit 10 is in the charging state, the second inductor L... m and the third inductor L n Will affect the first inductor L res It generates current excitation in the opposite direction.

[0101] like Figure 14 As shown in (b), when both the short pulse signal output by the first pulse excitation source 13 and the short pulse signal output by the second pulse excitation source are at a low level, both the first switch module 12 and the second switch module 12 are in the off state. At this time, the first inductor L res The first capacitor C in electrode 14 ant This forms a series resonant network, making the first inductor L res The stored electrical energy can be radiated outward through electrode 14, that is, the signal transmitting circuit 10 is in a resonant state at this time.

[0102] Based on this, this implementation can achieve control of the first inductor L by adjusting the phase of the pulse signal output by the first pulse excitation source 13 and / or the phase of the pulse signal output by the second pulse excitation source 13. res The differential excitation enables the signal transmitting circuit 10 to have even-order harmonic suppression function.

[0103] The following example illustrates the beneficial effects of this implementation method, using the following scenario as an example: both the frequency of the short pulse signal output by the first pulse excitation source 13 and the frequency of the short pulse signal output by the second pulse excitation source 13 are 10MHz; both have a duty cycle of 5%; and the phase difference between the short pulse signals output by the first and second pulse excitation sources 13 is 180 degrees. Please refer to [link to relevant documentation]. Figure 12 The figure shows the effect of using two short pulse signals with different phases to excite the two switching modules respectively. Figure 14 A comparative schematic diagram of various performance indicators of the signal transmitting circuit 10 is shown. Among them, Figure 12(a) shows the result when two short pulse signals with a phase difference of 180 degrees are used to excite the two switching modules 12 respectively. Figure 14 The voltage V on electrode 14 in the signal transmitting circuit 10 shown ant A waveform diagram; Figure 14 (b) shows the voltage V on the two switching modules 12 when two short pulse signals with a phase difference of 180 degrees are used to excite the two switching modules 12 respectively. s (including V) s1 and V s2 A waveform diagram; Figure 14 (c) in the figure represents the current I output by the DC power supply 10 when two short pulse signals with a phase difference of 180 degrees are used to excite the two switching modules 12 respectively. ind A waveform diagram; Figure 12 In the diagram, (d) represents the scenario where two short pulse signals with a phase difference of 180 degrees are used to excite the two switching modules 12 respectively. Figure 14 The spectrum diagram of the output power of the signal transmitting circuit 10 shown.

[0104] according to Figure 14 As shown in (a), using two short pulse signals with a phase difference of 180 degrees to excite the two switching modules 12 respectively can generate a resonant voltage of 195V on the electrode 14. Meanwhile, according to... Figure 14 As shown in (b), the maximum voltage amplitude on both switching modules 12 can be limited to 20V; and the voltage V on both switching modules 12... s1 and V s2 The phases of the two switches are also 180 degrees apart. Furthermore, when the two switch modules 12 switch from the off state to the on state, the voltage V on the two switch modules 12 changes. s1 and V s2 The waveforms all just cross zero, and the voltage V on both switching modules 12 is... s1 and V s2 Since the rate of change over time is 0, both switching modules 12 can be in a soft-switching state. This means that switching between the states of the two switching modules 12 does not cause additional power loss in the circuit, thereby further improving the power output efficiency of the signal transmitting circuit 10. Simultaneously, because the conduction time of both switching modules 12 is short, the brief conduction of the two switching modules 12 will not affect the voltage V on electrode 14. ant The waveform is affected, thus enabling the signal transmitting circuit 10 to maintain a high level of harmonic suppression. According to Figure 14 As can be seen from (c) in the diagram, since the first inductor L is subjected to a certain load in each cycle... resTwo excitations in opposite directions are performed, so two current pulses can be observed in each cycle. According to Figure 12 , the present embodiment can make the signal transmitting circuit 10 shown in Figure 15 reach 12.1dBm in transmitting power at 10MHz frequency point, and reach 41.4dB in harmonic suppression level, thereby realizing complete suppression of even-numbered harmonics.

[0105] Based on the same inventive concept, the embodiment of the present application further provides a wireless communication module.

[0106] Exemplarily, refer to Figure 15 , Figure 15 for a structural schematic diagram of a wireless communication module provided by the embodiment of the present application. As shown in Figure 16 , the wireless communication module can include the signal transmitting circuit 10, which can be the signal transmitting circuit in any one of the above-mentioned embodiments. It should be noted that the specific content of the signal transmitting circuit 10 can refer to the related description in the above-mentioned embodiments, which will not be repeated here.

[0107] In some other embodiments, the wireless communication module can further include a signal receiving circuit.

[0108] Based on the same inventive concept, the embodiment of the present application further provides an electronic device.

[0109] Exemplarily, refer to Figure 16 , Figure 16 for a structural schematic diagram of an electronic device provided by the embodiment of the present application. As shown in Figure 14 , the electronic device can include the direct current power supply 20 and ​ the wireless communication module shown in.

[0110] In the above-mentioned embodiments, the description of each embodiment has its own focus, and the parts not described or recorded in a certain embodiment can refer to the related description of other embodiments.

[0111] The above-mentioned embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.

Claims

1. A signal transmitting circuit, characterized by comprising: The inductor module, the switch module, the pulse excitation source and the electrode are included. The first end of the inductor module is used for connecting a direct current power supply, the second end of the inductor module is connected with the first end of the electrode, and the second end of the electrode is grounded. The first end of the pulse excitation source is grounded, the second end of the pulse excitation source is connected with the controlled end of the switch module, and the pulse excitation source is used for outputting a short pulse signal with a duty cycle less than a preset duty cycle threshold to the switch module to control the on-off of the switch module. The first conducting end of the switch module is connected with the controlled end of the inductor module, and the second conducting end of the switch module is grounded.

2. The signal transmitting circuit of claim 1, wherein, The switch module is used for connecting the controlled end of the inductor module to the ground to short-circuit the electrode when the short pulse signal is at a high level, so that the direct current power supply charges the inductor module. The switch module is also used for disconnecting the connection between the controlled end of the inductor module and the ground when the short pulse signal is at a low level, so that the inductor module and the electrode form a series resonant network, and the inductor module radiates the stored electric energy to the outside through the electrode.

3. The signal launch circuit of claim 1, wherein, The inductor module includes a first inductor. The first end of the first inductor is used as the first end of the inductor module, and the second end of the first inductor is used as the second end and the controlled end of the inductor module. The inductor module includes a first inductor and a second inductor, and the first inductor is forwardly coupled with the second inductor.

4. The signal launch circuit of claim 1, wherein, In the case that the first end of the first inductor and the first end of the second inductor are the same end, the first end of the second inductor is used as the first end of the inductor module, the second end of the second inductor is used as the controlled end of the inductor module, the first end of the first inductor is grounded, and the second end of the first inductor is used as the second end of the inductor module. The switch module is specifically used for connecting the second end of the second inductor to the ground to charge the second inductor by the direct current power supply when the short pulse signal is at a high level, and the second inductor transmits electric energy to the first inductor by a coupling mode. The number of the pulse excitation sources, the number of the switch modules and the number of the controlled ends of the inductor modules are all 2. The first end of the first pulse excitation source is grounded, the second end of the first pulse excitation source is connected with the controlled end of the first switch module, and the first pulse excitation source is used for outputting a first short pulse signal to the first switch module to control the on-off of the first switch module. The first conducting end of the first switch module is connected with the first controlled end of the inductor module, and the second conducting end of the first switch module is grounded; the first switch module is used for connecting the first controlled end of the inductor module to the ground when the first short pulse signal is high, so that the DC power supplies charges the inductor module; The first switch module is also used for disconnecting the first controlled end of the inductor module from the ground when the first short pulse signal is low, so that the inductor module and the electrode form a series resonant network, and the inductor module radiates the stored electric energy to the outside through the electrode; The first end of the second pulse excitation source is grounded, and the second end of the second pulse excitation source is connected with the controlled end of the second switch module; the second pulse excitation source is used for outputting a second short pulse signal to the second switch module to control the on-off of the second switch module; The first conducting end of the second switch module is connected with the second controlled end of the inductor module, and the second conducting end of the second switch module is grounded; the second switch module is used for connecting the second controlled end of the inductor module to the ground when the second short pulse signal is high, so that the DC power supplies charges the inductor module; the second switch module is also used for disconnecting the second controlled end of the inductor module from the ground when the second short pulse signal is low, so that the inductor module and the electrode form a series resonant network, and the inductor module radiates the stored electric energy to the outside through the electrode.

5. The signal transmitting circuit of claim 4, wherein, The inductor module comprises a first inductor, a second inductor and a third inductor; the first inductor and the second inductor are arranged in a forward coupling mode, and the first inductor and the third inductor are arranged in a reverse coupling mode; the first end of the first inductor, the first end of the second inductor and the first end of the third inductor are all the same end; The first end of the second inductor and the second end of the third inductor are connected in common as the first end of the inductor module, the second end of the second inductor is the first controlled end of the inductor module, the first end of the first inductor is grounded, the second end of the first inductor is the second end of the inductor module, and the first end of the third inductor is the second controlled end of the inductor module; The first switch module is specifically used for connecting the second end of the second inductor to the ground when the first short pulse signal is high, so that the DC power supplies charges the second inductor, and the second inductor transmits electric energy to the first inductor in a coupling mode; the first switch module is also specifically used for disconnecting the second end of the second inductor from the ground when the first short pulse signal is low, so that the first inductor and the electrode form a series resonant network, and the first inductor radiates the stored electric energy to the outside through the electrode; The second switch module is specifically configured to connect the first end of the third inductor to the ground when the second short pulse signal is at a high level, so that the DC power source charges the third inductor, and the third inductor transmits electric energy to the first inductor in a coupling manner; and the second switch module is specifically configured to disconnect the first end of the third inductor from the ground when the second short pulse signal is at a low level, so that the first inductor and the electrode form a series resonance network, and the first inductor radiates stored electric energy to the outside through the electrode.

6. The signal transmitting circuit of claim 5, wherein, The coupling coefficient between the first inductor and the second inductor is equal to the coupling coefficient between the first inductor and the third inductor, and the inductive reactance value of the second inductor is equal to the inductive reactance value of the third inductor.

7. The signal transmitting circuit according to any one of claims 1 to 6, characterized by, The electrode comprises a first capacitor and a first resistor. The first end of the first capacitor serves as the first end of the electrode, the second end of the first capacitor is connected to the first end of the first resistor, and the second end of the first resistor serves as the second end of the electrode.

8. The signal transmitting circuit according to any one of claims 1 to 6, characterized by, The signal transmitting circuit further comprises a second capacitor. The first end of the second capacitor is configured to be connected to the DC power source, and the second end of the second capacitor is grounded. The second capacitor is configured to filter out alternating current components in direct current signals output by the DC power source.

9. A wireless communication module, characterized by The signal transmitting circuit comprises the wireless communication module.

10. An electronic device, comprising: The wireless communication module comprises the DC power source and the signal transmitting circuit.

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