Electromagnetic positioning system power consumption reduction excitation circuit and method

Abstract

The invention relates to the technical field of electronic circuits, in particular to a power consumption reduction excitation circuit and method for an electromagnetic positioning system, and the circuit comprises an excitation signal source, a power amplification circuit, a transmitting coil, and a resonance matching capacitor. The excitation signal source is connected with the input end of the power amplification circuit, the output end of the power amplification circuit is connected with the transmitting coil, the resonance matching capacitor is connected with the transmitting coil in parallel, and the resonant frequency of a parallel resonance network formed by the resonance matching capacitor and the transmitting coil is equal to the frequency of an excitation signal output by the excitation signal source. The magnetic field intensity can be improved, and meanwhile heat loss and power consumption can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic circuit, in particular to a power reduction excitation circuit and method for electromagnetic positioning system. BACKGROUND

[0002] In the electromagnetic positioning system, the efficiency and power consumption of the excitation circuit are the key factors affecting the overall performance. In the prior art, the transmitting end usually adopts a class-B power amplifier circuit to drive the transmitting coil to generate an alternating magnetic field, but this method has a significant heat loss problem. Since the transmitting coil and the transistor are in series in the same loop, increasing the current to increase the magnetic field strength will cause the heat dissipation of the transistor to increase sharply, and then cause the temperature to rise. In order to consider the stability of the circuit, the current size has to be limited, thereby limiting the increase of the magnetic induction intensity. For example, without taking additional cooling measures, when the coil current reaches 1A, the power consumption of the excitation end increases by 12W, and the temperature of the transistor can be as high as 99℃.

[0003] Therefore, the problem of how to reduce heat loss and power consumption while increasing the magnetic field strength needs to be solved. SUMMARY

[0004] The main purpose of the present application is to provide a power reduction excitation circuit and method for electromagnetic positioning system, which aims to solve the technical problem of how to reduce heat loss and power consumption while increasing the magnetic field strength.

[0005] In order to achieve the above-mentioned purpose of the application, the first aspect of the present application provides a power reduction excitation circuit for electromagnetic positioning system, comprising an excitation signal source, a power amplifier circuit, a transmitting coil and a resonant matching capacitor; the excitation signal source is connected with the input end of the power amplifier circuit, the output end of the power amplifier circuit is connected with the transmitting coil, and the resonant matching capacitor is connected in parallel with the transmitting coil, and the resonant frequency of the parallel resonant network composed of the resonant matching capacitor and the transmitting coil is equal to the frequency of the excitation signal output by the excitation signal source.

[0006] Further, the power amplifier circuit is a class-B push-pull power amplifier circuit, comprising a transistor and a wire equivalent resistance, and the transistor, the wire equivalent resistance and the transmitting coil are in series in the same loop.

[0007] Further, the excitation signal output by the excitation signal source is a sinusoidal signal.

[0008] Further, it further comprises a current probe, which is arranged on the wire between the output end of the excitation signal source and the input end of the power amplifier circuit, and is used for measuring the current on the wire equivalent resistance RL from the excitation signal source to the transmitting coil.

[0009] Further, a monitoring device is also included for monitoring the voltage and current signals in the circuit, for monitoring the sine signal voltage generated by the excitation signal source, for indirectly measuring the current flowing through the corresponding resistance by monitoring the voltage of the equivalent resistance RL of the monitoring wire, and for monitoring the voltage across the transmitting coil.

[0010] The second aspect of the present application also proposes a method for reducing power consumption in an electromagnetic positioning system, the method comprising:

[0011] generating an excitation signal of a first specified frequency using an excitation signal source;

[0012] power amplifying the excitation signal through a power amplification circuit and outputting it to a transmitting coil;

[0013] connecting a resonance matching capacitor in parallel across the transmitting coil, so that the resonance frequency of the inductance and the capacitance is equal to the first specified frequency, forming a parallel resonance network, compensating for the reactive power, and greatly reducing the current drawn from the excitation end while keeping the original current intensity unchanged, so as to reduce the power consumption of the power amplification circuit.

[0014] Further, connecting a resonance matching capacitor in parallel across the transmitting coil, so that the resonance frequency of the parallel resonance network formed by the resonance matching capacitor and the transmitting coil is equal to the first specified frequency, comprising:

[0015] obtaining the inductance value L of the transmitting coil, the first specified frequency f c , and the equivalent resistance R L of the transmitting coil;

[0016] calculating the resonance matching capacitor value C to be configured by the following formula:

[0017]

[0018] connecting a capacitor in parallel across the transmitting coil according to the calculated resonance matching capacitor value C, so that the parallel resonance network formed by the transmitting coil and the capacitor has a resonance frequency equal to the first specified frequency f c .

[0019] Further, before calculating the resonance matching capacitor value C by the formula , comprising:

[0020] equivalent the transmitting coil to a circuit in series with an inductance L and an AC equivalent resistance R L , whose complex impedance is Z=R L +jw c L, where w c =2πf c is the first specified frequency f c corresponding angular frequency;

[0021] The total admittance Y is composed of the capacitance admittance Y C =jω c C and the coil admittance , that is

[0022] By the denominator real operation, the coil admittance can be expressed as

[0023] The imaginary part of the total admittance is When the imaginary part is zero, the circuit forms a parallel resonance, combined with ω c =2πf c , and finally the resonance matching capacitance calculation formula is obtained

[0024] Further, the capacitance is connected in parallel to the transmitting coil according to the resonance matching capacitance value C, so that the transmitting coil and the capacitance form a parallel resonance network, and the resonance frequency is equal to the first specified frequency f c Then, it includes:

[0025] By The quality factor Q is calculated, which is used to evaluate the energy loss. The larger the Q value is, the smaller the energy loss of the parallel resonance network is, and the more significant the power consumption reduction of the power amplification circuit is. Wherein, Q is the quality factor of the inductor coil, C is the resonance capacitance value; L is the inductance value of the transmitting coil; R L is the equivalent internal resistance of the transmitting coil.

[0026] The third aspect of the present application also proposes a power consumption reduction excitation method in an electromagnetic positioning system, which is realized based on the circuit of any one of the above. The method includes:

[0027] Generating an excitation signal of the first specified frequency by using an excitation signal source;

[0028] Power amplifying the excitation signal by using the power amplification circuit, and outputting to the transmitting coil;

[0029] Connecting a resonance matching capacitance in parallel to the transmitting coil, so that the resonance frequency of the inductance and the capacitance is equal to the first specified frequency, forming a parallel resonance network, compensating for the reactive power, and reducing the current drawn from the excitation end while keeping the original current intensity unchanged, so as to reduce the power consumption of the power amplification circuit.

[0030] The fourth aspect of the present application also proposes a computer device, including a memory and a processor, the memory stores a computer program, characterized in that the processor executes the computer program to realize the steps of the method of any one of the above.

[0031] A fifth aspect of this application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the methods described above.

[0032] Beneficial effects

[0033] The excitation signal source is connected to the input of the power amplifier circuit, and the output of the power amplifier circuit is connected to the transmitting coil. A resonant matching capacitor is connected in parallel with the transmitting coil, and the resonant frequency of the parallel resonant network formed by the two is equal to the excitation signal frequency. This scheme can significantly reduce the power consumption of the power amplifier circuit and slow down the temperature rise of the transistor while maintaining a constant transmitting coil current. The corresponding design eliminates the need for excessive current limitation, creating conditions for further increasing the transmitting coil current to enhance the magnetic induction intensity. This, in turn, helps to improve the strength of the induced signal at the receiving end, better suppresses environmental noise, improves the signal-to-noise ratio, and has a positive effect on improving positioning accuracy. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of a power-saving excitation circuit for an electromagnetic positioning system according to an embodiment of this application;

[0035] Figure 2 This is a schematic flowchart of a power-saving excitation method for an electromagnetic positioning system according to an embodiment of this application.

[0036] Figure 3 This is a schematic diagram of the prior art excitation terminal and transmitting terminal circuit according to an embodiment of this application;

[0037] Figure 4 This is a schematic diagram of the power consumption detection results before the excitation terminal of the present application is connected to the transmitting coil, according to an embodiment of the present application.

[0038] Figure 5 This is a schematic diagram of power consumption detection results after the excitation terminal of the prior art is connected to the transmitting coil, according to an embodiment of this application;

[0039] Figure 6 This is a schematic diagram of transistor temperature rise detection results in the prior art according to an embodiment of this application;

[0040] Figure 7 This is a simulation diagram of a prior art transmitting circuit according to an embodiment of this application;

[0041] Figure 8 This is a simulation diagram of the transmitting circuit of a power-saving excitation circuit for an electromagnetic positioning system according to an embodiment of this application;

[0042] Figure 9 This is a schematic diagram of the power consumption detection results before the excitation terminal is connected to the transmitting coil with resonant network in a power-reducing excitation circuit of an electromagnetic positioning system according to an embodiment of this application;

[0043] Figure 10 A power consumption detection result schematic diagram of a power consumption reduction excitation circuit of an electromagnetic positioning system according to an embodiment of the present application;

[0044] Figure 11 A transistor temperature rise detection result schematic diagram of a power consumption reduction excitation circuit of an electromagnetic positioning system according to an embodiment of the present application;

[0045] Figure 12 A structure schematic block diagram of a computer device according to an embodiment of the present application;

[0046] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the present application more clear, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0048] Those skilled in the art can understand that the singular forms "a", "an" and "the" used herein include plural forms unless specifically stated otherwise. It should be further understood that the use of the term "include" in the specification of the present application means that a feature, integer, step, operation, element, module and / or assembly exists, but does not exclude the existence or addition of one or more other features, integers, steps, operations, elements, modules, assemblies and / or combinations thereof. It should be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there can be an intermediate element. In addition, the "connection" or "coupling" used herein can include wireless connection or wireless coupling. The phrase "and / or" used herein includes all or any combination of the associated listed items and all combinations thereof.

[0049] Those skilled in the art can understand that unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art to which the present application belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have meanings consistent with those in the context of the prior art, and unless specifically defined as such, should not be interpreted to have idealized or overly formal meanings.

[0050] REFERENCE Figure 1The embodiment of the application provides a low-power excitation circuit of an electromagnetic positioning system, which comprises an excitation signal source, a power amplifier circuit, a transmitting coil and a resonance matching capacitor; the excitation signal source is connected with the input end of the power amplifier circuit, the output end of the power amplifier circuit is connected with the transmitting coil, and the resonance matching capacitor is connected with the transmitting coil in parallel, and the resonance frequency of the parallel resonance network formed by the resonance matching capacitor and the transmitting coil is equal to the frequency of the excitation signal output by the excitation signal source.

[0051] In the embodiment, the low-power excitation circuit of the electromagnetic positioning system mainly comprises four key components: an excitation signal source, a power amplifier circuit, a transmitting coil and a resonance matching capacitor. Among them, the excitation signal source generates an electric signal to drive a magnetic field, and the electric signal is amplified through the power amplifier circuit. This process first amplifies the signal by an operational amplifier (using double power supply, that is, +24V and-24V) to ensure the integrity and stability of the signal. Then, the signal amplified initially enters the power amplifier circuit to further improve its strength to effectively drive the subsequent circuit.

[0052] The core of the power amplifier circuit is a push-pull structure composed of two complementary symmetric NPN transistors Q1 and Q2, which are connected to +24V and-24V power supply respectively. This design not only improves the output capacity, but also effectively reduces the power consumption.

[0053] In order to optimize the energy transmission efficiency, the scheme introduces a resonance matching capacitor C, which is connected with the transmitting coil L in parallel to form an LC parallel resonance network. When the resonance frequency of the network is equal to the frequency of the excitation signal source, the coil current is mainly maintained through the energy exchange between the capacitor and the inductor, thereby significantly reducing the output current required by the power amplifier circuit. This improvement makes it possible to significantly reduce the total power consumption of the system while maintaining the strength of the magnetic field.

[0054] The prior art as shown in Figure 3 After connecting the transmitting coil, the coil L does reactive power, and the current directly flows from the driving end to the ground through the coil, as shown in Figures 4-5 , which leads to a significant increase in power consumption, from 7.784w to 19.92w, about 12w. In addition, as shown in Figure 6 , as the current increases, the temperature of the transistor rises to 99℃, indicating that the power consumption and temperature increase significantly, which limits the further improvement of the magnetic field strength.

[0055] By applying a resonance matching capacitor, as shown in Figure 9 and Figure 10 , the power consumption of the excitation end is significantly reduced, and the working temperature of the transistor is reduced to 66℃, as shown in Figure 11 . This shows that the scheme successfully solves the problem of "increasing current increases power consumption", which provides the possibility for improving the strength of the magnetic field.

[0056] In summary, the present scheme achieves a balance between magnetic field strength and power consumption by skillfully utilizing the parallel resonance characteristics, overcoming the inherent defects of the existing series structure, and opening up a new way for the performance improvement of electromagnetic positioning systems.

[0057] In an embodiment, the power amplification circuit is a class-B push-pull power amplification circuit, including a transistor and a wire equivalent resistance, and the transistor and the wire equivalent resistance are in series with the transmitting coil in the same loop.

[0058] In the implementation process, the power amplification circuit adopts the design of a class-B push-pull power amplification circuit, which can reduce the burden of the excitation circuit, thereby reducing the distortion of the excitation signal itself, improving the energy efficiency ratio of the system, and reducing unnecessary energy loss. Specifically, the class-B push-pull power amplification circuit uses a pair of complementary symmetric transistors (usually one NPN and one PNP transistor), so that each transistor only works in half of the signal period. This can effectively reduce the static current and thus reduce power consumption.

[0059] The core of the class-B push-pull circuit is two transistors, which are connected to positive and negative power supplies (such as +24V and -24V). When the input signal is positive half cycle, one transistor (e.g. NPN) is turned on; when the input signal is negative half cycle, the other transistor (e.g. PNP) is turned on. This ensures that the output end can obtain complete positive and negative half cycle signals, achieving efficient power transmission. In addition, in order to accurately control and protect the transistors, the circuit also contains necessary bias circuits and protection elements to prevent overload or damage.

[0060] In this design, the transistor and the wire equivalent resistance are in series with the transmitting coil L in the same loop, which means that the current flowing through the transistor also flows through the transmitting coil, thereby generating the required magnetic field. In this way, the circuit not only can efficiently amplify the signal, but also can directly drive the transmitting coil to form the required magnetic field for electromagnetic positioning.

[0061] In an embodiment, the excitation signal output by the excitation signal source is a sinusoidal signal.

[0062] The excitation signal output by the excitation signal source is a sinusoidal signal, which has a single frequency point characteristic value and strong resistance to static magnetic field, and the signal effective features are easier to extract at the receiving end.

[0063] In an embodiment, a current probe is further included, which is arranged on the wire between the output end of the excitation signal source and the input end of the power amplification circuit, for measuring the current on the wire equivalent resistance RL from the excitation signal source to the transmitting coil wire.

[0064] In this embodiment, the current probe includes current probe I_Rw and current probe I_L, current probe I_Rw is connected in parallel / series to Rw, and the loop current load is indirectly calculated by monitoring the voltage; oscilloscope V_L and current probe I_L are connected in parallel / series to the transmitting coil, and current probe I_Rw: the loop current flowing through Rw is indirectly calculated by measuring the voltage across the equivalent internal resistance Rw. Current probe I_L: used to monitor the current in the coil. Since the current probe is located close to the excitation signal source, it can help to evaluate the energy loss caused by the equivalent internal resistance RL of the wire. This is of great significance to optimizing the energy utilization efficiency of the entire circuit. Especially when trying to reduce the power consumption of the power amplifier circuit by adjusting the inductance value L and the parallel resonance capacitor C of the transmitting coil, accurate current measurement data is indispensable. I_L and I_Rw can determine whether resonance occurs, when resonance does not occur, I_L is equal to I_w, and when resonance occurs, I_L is much greater than I_Rw.

[0065] In an embodiment, further comprising a monitoring device for monitoring the voltage and current signals in the circuit, the monitoring device is used to monitor the sine signal voltage generated by the excitation signal source, indirectly measure the current flowing through the corresponding resistance by monitoring the voltage of the wire equivalent internal resistance RL, and monitor the voltage across the transmitting coil.

[0066] In this embodiment, the monitoring device includes three oscilloscopes, each of which undertakes different monitoring tasks. Oscilloscope V_S: connected to the output side of the power amplifier circuit, used to monitor the voltage signal of the amplified excitation signal. Its role is to confirm whether the amplitude and frequency of the amplified sinusoidal excitation signal are stable, and to ensure that the signal entering the subsequent transmitting loop meets the design requirements, which is the key monitoring point for controlling the quality of the excitation signal.

[0067] Oscilloscope V_Rw: connected in parallel across the wire equivalent internal resistance Rw, indirectly obtains the current flowing through Rw by monitoring the voltage of Rw combined with Ohm's law (I=U / Rw). Since Rw is connected in series with the transistor and the transmitting coil (refer to the series structure in the technical disclosure), this current is equivalent to the current flowing through the transistor and the transmitting coil, which can reflect the current load of the power amplifier circuit and assist in analyzing the correlation between power consumption, temperature, etc. and current.

[0068] Oscilloscope V_L: connected in parallel across the transmitting coil L, used to monitor the voltage of the transmitting coil.

[0069] The three oscilloscopes have clear division of labor, from the quality of the amplified excitation signal, indirect monitoring of the circuit current, to the working state of the transmitting coil, fully covering the key nodes of the circuit, providing direct and accurate electrical signal data for analyzing the performance of the circuit (such as the power consumption and temperature problems caused by current increase in the prior art, and the effect verification after the resonance improvement of the present scheme), which is the core hardware for realizing circuit monitoring and debugging.

[0070] In summary, the sine excitation signal source in the circuit of the present application outputs a standard sine wave as a basic excitation, and the signal is first amplified by an operational amplifier and drives a class-B push-pull circuit composed of Q1 (NPN transistor) and Q2 (PNP transistor). During the positive and negative half cycles of the sine wave, Q1 and Q2 are turned on in turn to "relay" the amplified current to provide strong driving power for the transmitting coil. The amplified current flows through the wire equivalent resistance Rw and the transmitting coil L (including the equivalent resistance RL), and the coil generates an alternating magnetic field due to the current excitation, which serves as the "field source" for electromagnetic positioning. At the same time, the voltage drop and power consumption of Rw and RL due to the current are monitored by the oscilloscope V_S to confirm the quality of the amplified signal (amplitude, frequency, distortion). The oscilloscope V_Rw and the current probe I_Rw are connected in parallel / series to Rw to indirectly calculate the current by monitoring the voltage and to master the current load of the loop. The oscilloscope V_L and the current probe I_L are connected in parallel / series to the transmitting coil to monitor the coil voltage and current and to reflect the state of the magnetic field generation.

[0071] Reference Figure 2 In an embodiment, a method for reducing power consumption in an electromagnetic positioning system is also proposed, which comprises:

[0072] S10, generating an excitation signal of a first specified frequency by using an excitation signal source;

[0073] S11, performing power amplification on the excitation signal by using a power amplification circuit and outputting to a transmitting coil;

[0074] S12, connecting a resonant matching capacitor in parallel across the transmitting coil, so that the resonant frequency of the inductance and the capacitance is equal to the first specified frequency, forming a parallel resonant network, compensating for reactive power, and used for reducing the current drawn from the excitation end while keeping the original current intensity unchanged, so as to reduce the power consumption of the power amplification circuit.

[0075] In the present embodiment, a method for reducing power consumption in an electromagnetic positioning system is realized based on a power consumption reduction excitation circuit in an electromagnetic positioning system. First, an excitation signal source generates an excitation signal of a first specified frequency, which is a sine wave to ensure the best anti-interference ability and processing efficiency at the receiving end. Then, the excitation signal is sent to a power amplification circuit for amplification. The power amplification circuit adopts a class-B push-pull structure and contains transistors and wire equivalent resistances. This design not only improves the output capability but also effectively reduces the power consumption. The amplified signal drives the transmitting coil to generate an alternating magnetic field. In order to further optimize energy transmission and reduce overall power consumption, a resonant matching capacitor is connected in parallel across the transmitting coil, so that the resonant frequency of the parallel resonant network composed of the capacitor and the transmitting coil is equal to the first specified frequency of the excitation signal.

[0076] By accurate calculation and resonance matching, most of the current circulates between the inductance (transmit coil) and the capacitance, reducing the current flowing through the power amplifier circuit, thereby significantly reducing the power consumption. Referring to Figures 9-10 It is shown that, compared with Figures 4-5 the 12W power consumption in the traditional scheme, the new scheme reduces the power consumption to about 3W, achieving a 75% power consumption reduction. At the same time, due to the reduction of unnecessary energy loss, the working temperature of the transistor is reduced from 99℃ to 66℃, greatly improving the stability and reliability of the system. In addition, this method allows further increase of the current intensity in the transmit coil without significantly increasing the power consumption, thereby enhancing the magnetic field strength and improving the performance and accuracy of the electromagnetic positioning system. In summary, by introducing a resonance matching capacitor and forming a parallel resonance network with the transmit coil, this method ingeniously solves the problem of increasing current and power consumption in the traditional circuit, providing a high-efficiency and stable magnetic field enhancement solution.

[0077] In an embodiment, a resonance matching capacitor is connected in parallel across the transmit coil, and the resonance frequency of the parallel resonance network formed by the resonance matching capacitor and the transmit coil is equal to the first specified frequency, comprising:

[0078] S20, obtaining the inductance value L of the transmit coil, the first specified frequency f c , and the equivalent resistance R of the transmit coil L ;

[0079] S21, calculating the required resonance matching capacitor value C by the following formula:

[0080]

[0081] S22, connecting a capacitor in parallel across the transmit coil according to the calculated resonance matching capacitor value C, forming a parallel resonance network with the transmit coil and the capacitor, and making the resonance frequency equal to the first specified frequency f c .

[0082] In an embodiment, for a transmit coil with known geometric size and number of windings, the inductance value L of the transmit coil is calculated, the working frequency f of the system is obtained c , and the equivalent resistance R of the transmit coil is measured L ,

[0083] The required resonance matching capacitor value C is calculated using the following formula:

[0084] The derivation of this formula is based on the characteristics of a parallel resonant circuit. In the parallel resonant state, the total impedance of the circuit reaches its maximum value. At this point, the current mainly circulates between the inductor and capacitor, reducing the current flowing through the power amplifier circuit and thus lowering power consumption. Based on the calculated resonant matching capacitor value C, the capacitor is connected in parallel across the transmitting coil. In this way, the transmitting coil and the capacitor form a parallel resonant network, making the resonant frequency equal to the first specified frequency f. c When the resonant frequency of the parallel resonant network equals the first specified frequency of the excitation signal, the circuit exhibits a high impedance state, with most of the current circulating between the inductor and capacitor, no longer entirely dependent on the power amplifier circuit for power. This design significantly reduces the current flowing through the power amplifier circuit, thereby reducing transistor conduction losses and lowering overall power consumption and temperature.

[0085] In one embodiment, by formula Before calculating the required resonant matching capacitor value C, the following should be included:

[0086] S30. The transmitting coil is equivalent to an inductance L and an AC equivalent internal resistance R. L In a series circuit, the complex impedance is Z = R. L +jw c L, where ω c =2πf c , is the first specified frequency f c The corresponding angular frequency;

[0087] S31, Total admittance Y is derived from capacitive admittance Y C =jω c C and coil admittance Composition, that is

[0088] S32. By converting the denominator to a real number, the coil admittance can be expressed as:

[0089] The imaginary part of the total admittance is When the imaginary part is zero, the circuit forms a parallel resonance, combined with ω c =2πf c Finally, the formula for calculating the resonant matching capacitor is obtained.

[0090] In this embodiment, the transmitting coil is equivalent to an inductance L and an AC equivalent internal resistance R. L The complex impedance z of the transmitting coil in a series circuit can be expressed as: Z = R L +jω c L; where ω c =2πf c , is the first specified frequency f c The corresponding angular frequency; the total admittance Y is determined by the capacitance admittance Y.C = jω c C and coil admittance The coil admittance can be expressed by the denominator real operation, and the coil admittance is composed of: The total admittance Y is composed of the capacitance admittance Y and the coil admittance Y 线圈 Therefore, the total admittance Y can be expressed as: When the imaginary part of the total admittance is zero, the loop forms a parallel resonance, and the imaginary part of the total admittance Y is set to zero, that is, Solving the above equation, the capacitance value C under resonance condition can be obtained: Combined with ω c = 2πf c Finally, the resonance matching capacitance calculation formula is obtained:

[0091] By equivalent to the transmitting coil as an inductance L and an alternating current equivalent resistance RL in series circuit, and introducing the capacitance admittance Y C and the coil admittance Y 线圈 , the complex characteristics of the entire circuit can be accurately described. When the imaginary part of the total admittance is zero, it means that the circuit is in a parallel resonance state, at this time the current mainly circulates between the inductance and the capacitance, reducing the current flowing through the power amplifier circuit, thereby reducing the power consumption.

[0092] This embodiment shows how to derive the calculation formula of the resonance matching capacitance C through detailed complex impedance and admittance analysis. Through accurate calculation and resonance matching, this method not only significantly reduces power consumption and temperature, but also provides the possibility of enhancing the magnetic field strength, thereby improving the overall performance and stability of the system. Allow further increase the current intensity in the transmitting coil without significantly increasing the power consumption, thereby enhancing the magnetic field strength, improving the performance and accuracy of the electromagnetic positioning system.

[0093] In an embodiment, the capacitance is connected in parallel to the transmitting coil according to the resonance matching capacitance value C, so that the transmitting coil and the capacitance form a parallel resonance network, and the resonance frequency is equal to the first specified frequency f c After that, it includes:

[0094] S40, by Calculate the quality factor Q for evaluating energy loss, the larger the Q value, the smaller the energy loss of the parallel resonance network, and the more significant the power consumption reduction of the power amplifier circuit; wherein, Q is the quality factor of the inductor coil, C is the resonance capacitance value; L is the inductance value of the transmitting coil; R L is the equivalent resistance of the transmitting coil.

[0095] In this embodiment, the quality factor can be calculated by the following formula: Quality factor Q is used to evaluate energy loss. Wherein, Q is the quality factor of the inductive coil, C is the resonance capacitor value; L is the inductance value of the transmitting coil; R L is the equivalent internal resistance of the transmitting coil. When the Q value is larger, it means that the energy loss of the parallel resonance network is smaller, and the power consumption of the power amplification circuit is reduced significantly. High quality factor means that the system can store and transmit energy more effectively in the resonant state, thereby improving the magnetic field strength and system efficiency.

[0096] After the resonance capacitor is connected in parallel in the above manner, referring to Figure 8 It can be seen that the current intensity I L of the transmitting coil is basically the same as the old circuit, but the current I Rw demanded by the excitation end is greatly reduced, about 1 / Q of the original; Compared with the working state of the transmitting circuit before the resonance matching capacitor is introduced Figure 7 , Figure 8 The advantages after introducing the resonance network can be intuitively displayed, including but not limited to: reducing the current demanded by the excitation end, thereby reducing the power consumption of the entire system. Improve the energy transmission efficiency, so that more energy is used to generate a magnetic field rather than being converted into heat energy. Improve the stability and reliability of the system, prolong the service life of the equipment.

[0097] In an embodiment, the application provides a power consumption reduction excitation method in an electromagnetic positioning system, which is based on the circuit described in any of the above embodiments, and the method comprises:

[0098] A1, generating an excitation signal of a first specified frequency using an excitation signal source;

[0099] A2, power amplifying the excitation signal through a power amplification circuit and outputting to a transmitting coil;

[0100] A3, connecting a resonance matching capacitor in parallel across the transmitting coil, making the resonance frequency of the inductor and the capacitor equal to the first specified frequency, constituting a parallel resonance network, compensating for reactive power, and used to reduce the current demanded by the excitation end while keeping the original current intensity unchanged, so as to reduce the power consumption of the power amplification circuit.

[0101] Referring to Figure 12 , the computer device in the embodiment of the application can be a server, and the internal structure thereof can be as shown in Figure 12The computer device includes a processor, a memory, a storage medium (non-volatile storage medium) and a network interface connected by a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes the storage medium (non-volatile storage medium) and the memory. The storage medium (non-volatile storage medium) stores an operating system, a computer program and a database. The memory provides an environment for the operating system and the computer program in the storage medium (non-volatile storage medium) to run. The database of the computer device is used to store the use data and the like in the process of the power reduction excitation circuit of the electromagnetic positioning system. The network interface of the computer device is used to communicate with the external terminal through the network connection. Further, the computer device can be further provided with an input device, a display screen and the like. The computer program is executed by the processor to implement an electromagnetic positioning system power reduction excitation circuit, including the following steps: generating an excitation signal of a first specified frequency by using an excitation signal source; performing power amplification on the excitation signal by a power amplifier circuit and outputting to a transmitting coil; parallel resonance matching capacitors are connected across the transmitting coil, the resonance frequency of the inductance and the capacitance is equal to the first specified frequency, a parallel resonance network is formed, and the reactive power is compensated, which is used to reduce the current drawn from the excitation end while keeping the original current intensity unchanged, so as to reduce the power consumption of the power amplifier circuit. Those skilled in the art can understand that Figure 12 The structure shown in the figure is only a block diagram of part of the structure related to the scheme of the present application, and does not constitute a limitation on the computer device to which the scheme of the present application is applied.

[0102] The computer program is executed by the processor to implement an electromagnetic positioning system power reduction excitation circuit, including the following steps: generating an excitation signal of a first specified frequency by using an excitation signal source; performing power amplification on the excitation signal by a power amplifier circuit and outputting to a transmitting coil; parallel resonance matching capacitors are connected across the transmitting coil, the resonance frequency of the inductance and the capacitance is equal to the first specified frequency, a parallel resonance network is formed, and the reactive power is compensated, which is used to reduce the current drawn from the excitation end while keeping the original current intensity unchanged, so as to reduce the power consumption of the power amplifier circuit. Those skilled in the art can understand that

[0103] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when executed, can include the processes of the above-mentioned embodiment methods. Any reference to memory, storage, databases, or other media in this application and in examples provided herein, unless specifically stated otherwise, can include non-volatile and / or volatile memory. Non-volatile memory can include, for example, read only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memory can include, for example, random access memory (RAM), or external cache memory. As an illustration and not a limitation, RAM is available in many forms such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), Rambus DRAM (RDRAM), direct Rambus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0104] It should be noted that the terms "comprising", "including", or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, a device, an article or a method that comprises a list of elements does not include only those elements recited, but can also include other elements not expressly listed or inherent to such process, device, article or method. Without further limitation, an element defined by the phrase "comprising a" does not exclude the presence of additional identical elements in the process, device, article or method that includes the element.

[0105] The above description is only the preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation using the content of the specification and drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the present application.

Claims

1. A reduced power excitation circuit for an electromagnetic position system, characterized by The excitation signal source, the power amplifier circuit, the transmitting coil and the resonant matching capacitor are connected in series.

2. The reduced power excitation circuit for an electromagnetic position system of claim 1 wherein, The excitation signal output by the excitation signal source is a sine signal.

3. The reduced power excitation circuit for an electromagnetic position system of claim 1 wherein, The method comprises:

4. The reduced power excitation circuit for an electromagnetic position system of claim 1 wherein, The excitation signal source generates an excitation signal of a first specified frequency; 5. The reduced power excitation circuit for an electromagnetic position system of claim 1 wherein, The power amplifier circuit amplifies the excitation signal and outputs it to the transmitting coil; 6. A method for reducing power consumption excitation in an electromagnetic positioning system, characterized by The resonant matching capacitor is connected in parallel across the transmitting coil, and the resonant frequency of the parallel resonant network formed by the resonant matching capacitor and the transmitting coil is equal to the frequency of the excitation signal output by the excitation signal source. The method comprises: The excitation signal source generates an excitation signal of a first specified frequency; The power amplifier circuit amplifies the excitation signal and outputs it to the transmitting coil; 7. The method of claim 6, wherein the step of reducing power consumption is performed by the electromagnetic positioning system. The resonant matching capacitor is connected in parallel across the transmitting coil, and the resonant frequency of the parallel resonant network formed by the resonant matching capacitor and the transmitting coil is equal to the frequency of the excitation signal output by the excitation signal source. acquire an inductance value L of the transmitting coil, a first specified frequency f c and an equivalent internal resistance R of the transmitting coil L ; ​ The calculated resonance matching capacitance value C is connected in parallel to both ends of the transmitting coil, so that the transmitting coil and the capacitance form a parallel resonance network, and the resonance frequency is equal to the first specified frequency f c .

8. The method of claim 7, wherein the step of reducing power consumption is performed by the electromagnetic positioning system. Before calculating the resonant matching capacitance value C to be configured, comprising: calculating the resonant matching capacitance value C to be configured, comprising: The transmitting coil is equivalent to an inductance L and an AC equivalent resistance R L A circuit in series whose complex impedance is Z = R L + jω c L, where ω c = 2πf c is a first specified frequency f c corresponding angular frequency; The total admittance Y is composed of the capacitance admittance Y C = jω c C and the coil admittance i.e. By the operation of realizing the denominator, the coil admittance can be expressed as The imaginary part of the total admittance is When the imaginary part is zero, the circuit forms a parallel resonance, combined with ω c = 2πf c Finally, the formula for calculating the resonance matching capacitor is obtained 9. The method of claim 6, wherein the excitation signal is a square wave. The capacitor is connected in parallel to the transmitting coil by a resonance matching capacitor value C, so that the transmitting coil and the capacitor form a parallel resonance network, and the resonance frequency is equal to the first specified frequency f c Thereafter, comprising: By A quality factor Q is calculated for evaluating energy loss, and the larger the Q value is, the smaller the energy loss of the parallel resonance network is, and the more significant the power consumption of the power amplification circuit is reduced; wherein, Q is a quality factor of the inductor coil, C is a resonance capacitor value; L is an inductance value of the transmitting coil; R L is an equivalent internal resistance of the transmitting coil.

10. A method for reducing power consumption excitation in an electromagnetic positioning system, implemented based on the circuit according to any one of claims 1-5, characterized in that, ​ ​ ​ ​

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