Automatic tuning device of short wave therapy apparatus and short wave therapy apparatus

Abstract

This invention discloses an automatic tuning device and a shortwave therapy device, relating to the field of tuning. It includes: a solid-state source for generating an AC signal and outputting it to a coupler; a coupler for stepping down the AC signal and outputting it to a tuner, generating a DC feedback signal based on the AC signal and sending it to a controller; the value of the DC feedback signal is positively correlated with the value of the AC signal and negatively correlated with the degree of impedance matching; a tuner for adjusting its own impedance based on the adjustment signal output by the controller to match the impedance of the user's attached electrode pads; and a controller for controlling the solid-state source to generate the AC signal and generating the adjustment signal based on the DC feedback signal. When impedance matching is poor, the value of the DC feedback signal increases, requiring adjustment of the tuner's impedance to achieve impedance matching with the user. The controller controls the tuner to adjust its own impedance, eliminating the need for manual adjustment by the user and simplifying the adjustment process.

Description

Technical Field

[0001] This invention relates to the field of tuning, and in particular to an automatic tuning device for a shortwave therapy device and the shortwave therapy device itself. Background Technology

[0002] Current technologies often employ high-voltage DC power supplies, vacuum tubes, and manual tuners as the core components of shortwave therapy devices. The high-voltage DC power supply outputs a DC signal, which is converted into an AC signal by the vacuum tube. The manual tuner then matches the impedance to the user's, outputting the AC signal to the electrode plates. The user then attaches the electrode plates to their body to achieve shortwave therapy. The operating point of the shortwave therapy device is adjusted by manually tuning the air capacitor and observing the intensity on a display connected to the controller. A stronger indicator on the display indicates a better operating point, meaning the optimal operating point (optimal impedance matching) is achieved through manual operation. This works normally in the initial stages of treatment. However, because the entire treatment system is open-loop, slight movement of the body during prolonged treatment inevitably causes the system's operating point to shift, resulting in poor or no treatment effect and wasted treatment time. Summary of the Invention

[0003] The purpose of this invention is to provide an automatic tuning device for a shortwave therapy device and a shortwave therapy device, which controls the tuner to adjust its own impedance through a controller, eliminating the need for manual adjustment by the user and simplifying the adjustment process.

[0004] To solve the above-mentioned technical problems, the present invention provides an automatic tuning device for a shortwave therapy instrument, comprising:

[0005] A solid-state source, with its control terminal connected to the first output terminal of the controller and the first output terminal connected to the input terminal of the coupler, is used to generate an AC signal and output it to the coupler.

[0006] The coupler has a first output terminal connected to the first input terminal of the controller and a second output terminal connected to the input terminal of the tuner. It is used to step down the AC signal and output it to the electrode plate through the tuner. It generates a DC feedback signal based on the AC signal and sends it to the controller. The value of the DC feedback signal is positively correlated with the value of the AC signal and negatively correlated with the degree of impedance matching.

[0007] The tuner, with its output connected to the electrode plate, is used to adjust its impedance based on the adjustment signal output by the controller, so as to match the user's impedance when the electrode pads are attached.

[0008] The controller is used to control the solid-state source to generate an AC signal and to generate an adjustment signal based on the DC feedback signal.

[0009] On the other hand, the coupler includes a step-down module and a voltage conversion module;

[0010] The input terminal of the step-down module serves as the input terminal of the coupler, the first output terminal of the step-down module is connected to the input terminal of the voltage conversion module, the output terminal of the voltage conversion module serves as the first output terminal of the coupler, and the second output terminal of the step-down module serves as the second output terminal of the coupler.

[0011] The step-down module is used to step down the AC signal and output it to the tuner and the voltage conversion module. The voltage conversion module is used to convert the AC signal into a DC feedback signal that represents the forward power and the reverse power, and send it to the controller.

[0012] On the other hand, the step-down module includes a first transformer, a second transformer, a first attenuation circuit, a second attenuation circuit, a first resistor, and a second resistor;

[0013] The first end of the primary winding of the first transformer serves as the input terminal of the step-down module. The second end of the primary winding of the first transformer is connected to the first end of the secondary winding of the second transformer, and the common terminal of the connection serves as the second output terminal of the step-down module. The second end of the secondary winding of the second transformer is grounded. The first end of the secondary winding of the first transformer is connected to the first end of the second resistor and the input terminal of the first attenuation circuit. The second end of the secondary winding of the first transformer is connected to the first end of the first resistor and the input terminal of the second attenuation circuit. The second ends of the first resistor and the second resistor are connected to the first end of the primary winding of the second transformer. The second end of the secondary winding of the second transformer is grounded. The output terminals of the first attenuation circuit and the second attenuation circuit are both connected to the input terminal of the voltage conversion module.

[0014] The first transformer and the second transformer are used to step down the AC signal, the first attenuation circuit and the second attenuation circuit are used to attenuate the signal amplitude and impedance of the AC signal, and the first resistor and the second resistor are used for bridge balancing.

[0015] On the other hand, the voltage conversion module includes a first diode and a second diode;

[0016] The anode of the first diode is connected to the output terminal of the first attenuation circuit, and the cathode of the first diode is connected to the controller. The anode of the second diode is connected to the output terminal of the second attenuation circuit, and the cathode of the second diode is connected to the controller.

[0017] Both the first diode and the second diode are used to convert the stepped-down and attenuated AC signal into a DC signal representing the forward and reverse power.

[0018] On the other hand, it also includes a first capacitor, a second capacitor, and a third capacitor;

[0019] The first terminal of the first capacitor is connected to the first output terminal of the solid-state source, the second terminal of the first capacitor is connected to the input terminal of the step-down module, the first terminal of the second capacitor is connected to the cathode of the first diode, the second terminal of the second capacitor is grounded, the first terminal of the third capacitor is connected to the cathode of the second diode, and the second terminal of the third capacitor is grounded.

[0020] The first capacitor is used to isolate the DC voltage output by the solid-state source, and the second and third capacitors are used for filtering.

[0021] On the other hand, the tuner includes a fixed matching module, an air capacitor, and a motor;

[0022] The fixed matching module is connected to the air capacitor and the electrode plate respectively for impedance matching;

[0023] The control terminal of the air capacitor is connected to the output terminal of the motor, and the control terminal of the motor is connected to the second output terminal of the controller. The motor is used to rotate under the control of the controller to drive the air capacitor to adjust its capacitance value.

[0024] On the other hand, the fixed matching module includes a fourth capacitor, a fifth capacitor, and a hollow inductor circuit;

[0025] The common terminal of the first end of the fourth capacitor and the first end of the fifth capacitor is connected and serves as the input terminal of the tuner. The second ends of the fourth capacitor and the fifth capacitor are connected to the first end of the main signal link of the hollow inductor capacitor. The second end of the main signal link is grounded. The first end of the first coupling link of the hollow inductor capacitor is connected to the first end of the electrode plate. The second end of the first coupling link is connected to the first end of the air capacitor. The second end of the air capacitor is connected to the first end of the second coupling link of the hollow inductor capacitor. The second end of the second coupling link is connected to the second end of the electrode plate.

[0026] The fourth capacitor, the fifth capacitor, and the hollow inductor circuit are used to achieve impedance matching.

[0027] On the other hand, the air capacitor includes a rotating shaft, multiple moving plates fixed on the rotating shaft and rotating simultaneously with the rotating shaft, and multiple fixed plates fixed on the inner wall of the air capacitor body. The plane where each moving plate is located is parallel to and alternately distributed with the plane where each fixed plate is located. The rotating shaft is connected to the output end of the motor.

[0028] The rotating shaft is used to rotate based on the drive of the motor to move the moving plate. When multiple moving plates are all rotated between multiple fixed plates, the capacitance value of the air capacitor is at its maximum.

[0029] On the other hand, the controller is specifically used to perform the following steps:

[0030] The solid-state source is controlled to generate an AC signal;

[0031] Receive the DC feedback signal returned by the coupler;

[0032] When the signal value of the DC feedback signal is greater than the preset voltage, an adjustment signal is generated according to the preset correspondence between the signal value of the DC feedback signal, the capacitance value of the air capacitor in the tuner, and the rotation angle of the motor in the tuner.

[0033] The adjustment signal is sent to the motor in the tuner so that the motor moves according to the rotation angle corresponding to the adjustment signal, driving the shaft of the air capacitor in the tuner to rotate. The value of the air capacitor changes, and thus the impedance of the tuner changes to achieve impedance matching.

[0034] To solve the above-mentioned technical problems, the present invention also provides a shortwave therapy device, including the automatic tuning device of the above-mentioned shortwave therapy device, and further including electrode sheets;

[0035] The electrode pad is connected to the output terminal of the tuner of the automatic tuning device of the shortwave therapy instrument, and is used to output the AC signal after voltage reduction and impedance matching.

[0036] This application provides an automatic tuning device for a shortwave therapy device and the shortwave therapy device itself, relating to the field of tuning. The device includes: a solid-state source for generating an AC signal and outputting it to a coupler; a coupler for stepping down the AC signal and outputting it to a tuner, generating a DC feedback signal based on the AC signal and sending it to a controller; the value of the DC feedback signal is positively correlated with the value of the AC signal and negatively correlated with the degree of impedance matching; a tuner for adjusting its own impedance based on an adjustment signal output by the controller to match the impedance of the user's attached electrode pads; and a controller for controlling the solid-state source to generate the AC signal and generating the adjustment signal based on the DC feedback signal. When impedance matching is poor, the value of the DC feedback signal increases, requiring adjustment of the tuner's impedance to achieve impedance matching with the user. The controller controls the tuner to adjust its own impedance, eliminating the need for manual adjustment by the user and simplifying the adjustment process. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 A schematic diagram of the structure of an automatic tuning device for a shortwave therapy instrument provided by the present invention;

[0039] Figure 2 A schematic diagram of a coupler provided by the present invention;

[0040] Figure 3 A schematic diagram of the structure of a tuner provided by the present invention;

[0041] Figure 4 This is a schematic diagram of the structure of a hollow inductor circuit provided by the present invention;

[0042] Figure 5 A schematic diagram of the structure of an air capacitor provided by the present invention;

[0043] Figure 6 This is a schematic diagram of the simulation results of a tuner provided by the present invention. Detailed Implementation

[0044] The core of this invention is to provide an automatic tuning device for a shortwave therapy device and a shortwave therapy device. The controller controls the tuner to adjust its own impedance, eliminating the need for manual adjustment by the user and simplifying the adjustment process.

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] Figure 1 This is a schematic diagram of the structure of an automatic tuning device for a shortwave therapy device provided by the present invention. The automatic tuning device for the shortwave therapy device includes:

[0047] Solid-state source 1, the control terminal is connected to the first output terminal of controller 4, and the first output terminal is connected to the input terminal of coupler 2, used to generate AC signals and output them to coupler 2;

[0048] Coupler 2 has its first output terminal connected to the first input terminal of controller 4 and its second output terminal connected to the input terminal of tuner 3. It is used to step down the AC signal and output it to the electrode plate through tuner 3. It generates a DC feedback signal based on the AC signal and sends it to controller 4. The value of the DC feedback signal is positively correlated with the value of the AC signal and negatively correlated with the degree of impedance matching.

[0049] Tuner 3, whose output is connected to the electrode plate, is used to adjust its own impedance based on the adjustment signal output by controller 4, so as to match the user impedance of the pasted electrode plate.

[0050] Controller 4 is used to control the solid-state source 1 to generate AC signals and generate adjustment signals based on DC feedback signals.

[0051] Current technologies often employ high-voltage DC power supplies, vacuum tubes, and manual tuners as the core components of shortwave therapy devices. The high-voltage DC power supply outputs a DC signal, which is converted into an AC signal by the vacuum tube. The manual tuner then matches the impedance to the user's, outputting the AC signal to the electrode plates. The user then attaches the electrode plates to their body to achieve shortwave therapy. The operating point of the shortwave therapy device is adjusted by manually tuning the air capacitor and observing the intensity on a display connected to the controller. A stronger indicator on the display indicates a better operating point, meaning the optimal operating point (optimal impedance matching) is achieved through manual operation. This works normally in the initial stages of treatment. However, because the entire treatment system is open-loop, slight movement of the body during prolonged treatment inevitably causes the system's operating point to shift, resulting in poor or no treatment effect and wasted treatment time.

[0052] This application uses a motor to control the rotation of the tuning capacitor, eliminating the need for manual operation. However, the optimal operating point will change when the body moves or engages during treatment. If a change in the pointer intensity is detected, the tuning capacitor needs to be manually rotated again to find the optimal operating point once more.

[0053] The motor rotates the tuning capacitor, and the reflected voltage value is detected in real time. The larger the reflected voltage value, the worse the working point position. When the reflected voltage reaches the set threshold, the motor can be triggered to automatically rotate the tuning capacitor to reach the optimal working point again.

[0054] Solid-state source 1 primarily uses a transistor oscillator circuit to generate shortwave signals, powered by a regulated power supply with adjustable power. It requires a 50-ohm output impedance to provide energy to the shortwave therapy device; details are omitted here. A crystal oscillator circuit is used to achieve precise control of the 27.12MHz frequency, outputting a shortwave signal. This shortwave signal is an AC signal with a 50-ohm output impedance, compatible with most solid-state sources. Coupler 2 detects the energy of the shortwave signal output from solid-state source 1, ensuring that the shortwave energy is delivered to the electrode plates while protecting solid-state source 1 from damage due to excessive reflected power. Tuner 3 primarily matches the impedance changes of the human body / patient treatment site to ensure efficient energy transmission. The electrode plates consist of metal electrodes covered with an insulating layer; their size is adjustable, and shortwave energy is applied to the human body through the electrode plates.

[0055] The controller 4 primarily detects changes in the reflected voltage of coupler 2 in real time, and then controls the motor in tuner 3 to rotate the tuning capacitor to find the operating point with the lowest reflected voltage. At the optimal operating point, the DC feedback signal fed back to controller 4 should be relatively small. If the DC feedback signal exceeds a certain threshold, it indicates that the current operating point is not the optimal operating point, i.e., there is an impedance mismatch. Therefore, it is necessary to adjust the impedance of tuner 3, specifically by adjusting the air capacitor C6 in tuner 3.

[0056] This application provides an automatic tuning device for a shortwave therapy instrument, relating to the field of tuning, comprising: a solid-state source 1 for generating an AC signal and outputting it to a coupler 2; a coupler 2 for stepping down the AC signal and outputting it to a tuner 3, generating a DC feedback signal based on the AC signal and sending it to a controller 4, wherein the value of the DC feedback signal is positively correlated with the value of the AC signal and negatively correlated with the degree of impedance matching; a tuner 3 for adjusting its own impedance based on the adjustment signal output by the controller 4 to match the impedance of the user attaching electrode pads; and a controller 4 for controlling the solid-state source 1 to generate the AC signal and generating the adjustment signal based on the DC feedback signal. When the impedance matching is poor, the value of the DC feedback signal will increase, at which point the impedance of the tuner 3 needs to be adjusted to achieve impedance matching with the user. The controller 4 controls the tuner 3 to adjust its own impedance, eliminating the need for manual adjustment by the user, thus simplifying the adjustment process.

[0057] Based on the above embodiments:

[0058] Figure 2 A schematic diagram of a coupler provided by the present invention;

[0059] In some embodiments, the coupler 2 includes a step-down module and a voltage conversion module;

[0060] The input terminal of the step-down module serves as the input terminal of coupler 2. The first output terminal of the step-down module is connected to the input terminal of the voltage conversion module. The output terminal of the voltage conversion module serves as the first output terminal of coupler 2. The second output terminal of the step-down module serves as the second output terminal of coupler 2.

[0061] The step-down module is used to step down the AC signal and output it to the tuner 3 and the voltage conversion module. The voltage conversion module is used to convert the AC signal into a DC feedback signal that represents the forward and reverse power and send it to the controller 4.

[0062] The tuner 3 and the human body, integrated as a whole, serve as a load, approaching 50 ohms. The main function of the step-down module and voltage conversion module is to couple a small signal from the high-power signal and send it as a sample signal to the controller 4 for processing. While ensuring the amplitude of the detected signal, it aims to adjust the output impedance of coupler 2 to achieve conjugate matching with the input impedance of tuner 3, reducing the influence of reflected shortwave energy and thus increasing the isolation between forward and reverse power, ensuring the accuracy of forward and reverse power detection. Forward and reverse power are voltage values, which are the input signals to controller 4. The controller 4 outputs control signals to the motor in tuner 3 to control its rotation. Therefore, the AC signal output from solid-state source 1 is first processed by the step-down module before being output to tuner 3. Simultaneously, the signal output to controller 4 needs to be adjusted twice by both the step-down module and the voltage conversion module before being output.

[0063] In some embodiments, the step-down module includes a first transformer T1, a second transformer T2, a first attenuation circuit U1, a second attenuation circuit U2, a first resistor R1, and a second resistor R2;

[0064] The first end of the primary coil of the first transformer T1 serves as the input terminal of the step-down module. The second end of the primary coil of the first transformer T1 is connected to the first end of the secondary coil of the second transformer T2, and the common terminal of the connection serves as the second output terminal of the step-down module. The second end of the secondary coil of the second transformer T2 is grounded. The first end of the secondary coil of the first transformer T1 is connected to the first end of the second resistor R2 and the input terminal of the first attenuation circuit U1. The second end of the secondary coil of the first transformer T1 is connected to the first end of the first resistor R1 and the input terminal of the second attenuation circuit U2. The second ends of the first resistor R1 and the second resistor R2 are connected to the first end of the primary coil of the second transformer T2. The second end of the secondary coil of the second transformer T2 is grounded. The output terminals of the first attenuation circuit U1 and the second attenuation circuit U2 are both connected to the input terminal of the voltage conversion module.

[0065] The first transformer T1 and the second transformer T2 are used to step down the AC signal, the first attenuation circuit U1 and the second attenuation circuit U2 are used to attenuate the signal amplitude and impedance of the AC signal, and the first resistor R1 and the second resistor R2 are used for bridge balancing.

[0066] Coupler 2 employs a dual-magnetic-ring detection method using first transformer T1 and second transformer T2. The two transformers are manufactured using the same materials to minimize the impact of factors such as phase errors. The sampled AC signal amplitudes of first transformer T1 and second transformer T2 are equal. In actual manufacturing, shielding and isolation between the two sets of transformers is crucial. It must be emphasized that electric field shielding between the primary and secondary windings of the transformers is also essential; otherwise, the frequency flatness of coupler 2 will be poor. The secondary coil of the transformer can use a signal transmission line with single-ended shielding. Because the amplitude of the secondary shortwave signal is small, it is easily interfered with by external signals. Single-ended grounding of the transmission line's shielding layer can introduce interference signals to ground. If the shielding layer is grounded at multiple points, the potential difference between the different grounding points will create current in the shielding layer, introducing interference and affecting the operation of the secondary coil's shortwave signal. The first attenuation circuit U1 and the second attenuation circuit U2 mainly use π-type or T-type attenuators to ensure the power level of the detection diodes. Based on the bridge balance of coupler 2, first resistor R1 and second resistor R2 are set.

[0067] In the specific implementation process, the resistance values ​​of the first resistor R1 and the second resistor R2 are fixed at 50 ohms. The coil turns ratio of the first transformer T1 and the second transformer T2 is designed to be 1:22.

[0068] In some embodiments, the voltage conversion module includes a first diode D1 and a second diode D2;

[0069] The anode of the first diode D1 is connected to the output terminal of the first attenuation circuit U1, and the cathode of the first diode D1 is connected to the controller 4. The anode of the second diode D2 is connected to the output terminal of the second attenuation circuit U2, and the cathode of the second diode D2 is connected to the controller 4.

[0070] Both the first diode D1 and the second diode D2 are used to convert the stepped-down and attenuated AC signal into a DC signal representing the forward and reverse power.

[0071] Diodes D1 and D2 are detector diodes, used here to convert AC voltage into DC voltage. They are primarily used to detect the sampling levels of the forward and reverse power of the radio frequency signal. The main characteristic of this circuit is its flat frequency response within the shortwave frequency range; their equivalent parallel impedance changes very little with frequency, resulting in good frequency response characteristics and ensuring the stability and accuracy of the detected values.

[0072] In some embodiments, the capacitor further includes a first capacitor C1, a second capacitor C2, and a third capacitor C3;

[0073] The first terminal of the first capacitor C1 is connected to the first output terminal of the solid-state source 1, the second terminal of the first capacitor C1 is connected to the input terminal of the step-down module, the first terminal of the second capacitor C2 is connected to the cathode of the first diode D1, the second terminal of the second capacitor C2 is grounded, the first terminal of the third capacitor C3 is connected to the cathode of the second diode D2, and the second terminal of the third capacitor C3 is grounded.

[0074] The first capacitor C1 is used to isolate the DC voltage output from the solid-state source 1, while the second capacitor C2 and the third capacitor C3 are used for filtering.

[0075] The first capacitor C1 acts as a DC blocking capacitor to prevent the DC power from the solid-state source 1 from burning out the coupler 2 circuit. The second capacitor C2 and the third capacitor C3 are DC voltage filter capacitors to reduce ripple components and improve detection accuracy.

[0076] Figure 3 A schematic diagram of the structure of a tuner provided by the present invention;

[0077] In some embodiments, tuner 3 includes a fixed matching module, an air capacitor C6, and a motor;

[0078] The fixed matching module is connected to the air capacitor C6 and the electrode plate respectively for impedance matching;

[0079] The control terminal of the air capacitor C6 is connected to the output terminal of the motor, and the control terminal of the motor is connected to the second output terminal of the controller 4. The motor is used to rotate under the control of the controller 4 to drive the air capacitor C6 to adjust its capacitance value.

[0080] Its main function is to dynamically match the impedance changes of different parts of the human body to ensure maximum energy transmission efficiency. It primarily employs an LC resonant network, using a variable air capacitor C6 to adjust the resonant frequency to match the impedance of different parts of the body. The air capacitor C6 is a capacitor using air as the dielectric, composed of multiple movable plates that can rotate 180° and multiple fixed plates. Its capacitance is continuously adjustable within a certain range. When all the movable plates are rotated into the space between the fixed plates, the capacitance is at its maximum; conversely, when all the movable plates are rotated out of the space between the fixed plates, the capacitance is at its minimum. Air-dielectric variable capacitors feature precise capacitance adjustment, low dielectric loss, good stability, long lifespan, relatively large size, and high insulation resistance. They are commonly used in electronic devices such as radios, electronic instruments, communication equipment, and cable television broadcasting.

[0081] The first electrode plate P1 and the second electrode plate P2 are two electrode plates that act on the human body. Since the air capacitor C6 is in the same circuit as the electrode plates, the capacitance value of the air capacitor C6 can be adjusted to compensate when the human body moves.

[0082] Figure 4 This is a schematic diagram of the structure of a hollow inductor circuit provided by the present invention;

[0083] In some embodiments, the fixed matching module includes a fourth capacitor C4, a fifth capacitor C5, and a hollow inductor circuit.

[0084] The first terminal of the fourth capacitor C4 and the first terminal of the fifth capacitor C5 are connected and their common terminal is used as the input terminal of the tuner 3. The second terminals of the fourth capacitor C4 and the fifth capacitor C5 are connected to the first terminal of the main signal link of the air-core inductor capacitor. The second terminal of the main signal link is grounded. The first terminal of the first coupling link of the air-core inductor capacitor is connected to the first terminal of the electrode plate. The second terminal of the first coupling link is connected to the first terminal of the air capacitor C6. The second terminal of the air capacitor C6 is connected to the first terminal of the second coupling link of the air-core inductor capacitor. The second terminal of the second coupling link is connected to the second terminal of the electrode plate.

[0085] The fourth capacitor C4, the fifth capacitor C5, and the hollow inductor circuit are used to achieve impedance matching.

[0086] The fourth capacitor C4 and the fifth capacitor C5 form a feedback regulation matching network, consisting of two 18pF capacitors connected in parallel. The first electrode plate P1 and the second electrode plate P2 are two electrode plates applied to the human body. L1, L2, and L3 form a set of air-core inductor circuits. L2 is the main signal link, and L1 and L3 are the coupling links. L2 is an air-core inductor coil with a wire diameter of 3mm, a coil diameter of 40mm, a length of 11mm, and 1.5 turns. L1 and L3 are air-core inductor coils with a wire diameter of 3mm, a coil diameter of 40mm, a length of 30mm, and 5 turns.

[0087] Figure 5 A schematic diagram of the structure of an air capacitor provided by the present invention;

[0088] In some embodiments, the air capacitor C6 includes a rotating shaft, a plurality of movable plates fixed on the rotating shaft and rotating simultaneously with the rotating shaft, and a plurality of fixed plates fixed on the inner wall of the air capacitor C6 body. The plane where each movable plate is located is parallel to the plane where each fixed plate is located and is alternately distributed. The rotating shaft is connected to the output end of the motor.

[0089] The rotating shaft is used for motor-driven rotation to move the moving plates. When multiple moving plates are all rotated between multiple fixed plates, the capacitance value of the air capacitor C6 is at its maximum.

[0090] The air capacitor C6 changes its capacitance by rotating under motor control. The motor rotation is controlled based on the magnitude of the reflected voltage value of the coupler 2. The smaller the reflected voltage, the better the operating point. When the reflected voltage exceeds the threshold, the motor is triggered to drive the tuning capacitor to rotate and find the optimal operating point again.

[0091] Figure 6 A schematic diagram illustrating the simulation results of a tuner provided by the present invention;

[0092] from Figure 6 Simulation results for tuner 3 show that when the first electrode P1 and the second electrode P2 are applied to different parts of the human body, shortwave energy can be efficiently transmitted to different parts of the human body by adjusting the size of the air capacitor C6. Freq.MHz is the frequency, ds(B(1,1)) is the reflected voltage value, Freq is the backlash loss, and impedance is the impedance.

[0093] In some embodiments, controller 4 is specifically configured to perform the following steps:

[0094] Control solid-state source 1 to generate AC signals;

[0095] Receive the DC feedback signal returned by coupler 2;

[0096] When the DC feedback signal value is greater than the preset voltage, an adjustment signal is generated according to the preset correspondence between the DC feedback signal value, the capacitance value of the air capacitor in the tuner, and the rotation angle of the motor in the tuner.

[0097] The adjustment signal is sent to the motor in tuner 3 so that the motor moves according to the rotation angle corresponding to the adjustment signal, which drives the shaft of the air capacitor C6 in tuner 3 to rotate. The value of the air capacitor C6 changes, and thus the impedance of tuner 3 changes to achieve impedance matching.

[0098] In addition, the temperature feedback terminal of solid-state source 1 is connected to the second input terminal of controller 4. Solid-state source 1 detects its own temperature and sends a high level to controller 4 when it exceeds the temperature limit, thereby controller 4 turns off the power of solid-state source 1.

[0099] The controller 4 can be pre-set with the corresponding relationship between the DC feedback signal value, the capacitance value of the air capacitor C6 in the tuner 3, and the rotation angle of the motor in the tuner 3. That is, when the DC feedback signal value deviates from the normal range, for example, exceeding the preset voltage, it indicates poor impedance matching, and the tuner 3 needs to adjust the impedance. The impedance adjustment of the tuner 3 mainly relies on changing the capacitance value of the air capacitor C6. The air capacitor C6's capacitance value changes due to the motor's rotation driving the shaft. Therefore, according to this correspondence, the air capacitor value can be controlled to a more suitable value, thereby achieving impedance matching.

[0100] This application provides a specific implementation process:

[0101] The shortwave therapy device operates at a frequency of 27.12MHz. Assuming a maximum power output of 100W (50dBm), i.e., the solid-state source 1 outputs 100W, the coupling through the detector circuit is -27dB. The coupling can be adjusted according to the transformer turns ratio. This application uses a 1:22 turns ratio, and the calculated coupling is around -27dB. The attenuator uses a 3dB π-type attenuation. Therefore, the forward power entering detector D1 is 50dBm - 27dB - 3dB = 20dBm (100mW). The reverse power entering detector D2 is much smaller than the forward power. Assuming a forward and reverse voltage directionality of 20dB, the reverse power entering detector D2 is 0dBm (1mW). When the first electrode plate P1 and the second electrode plate P2 are applied to the human body, the controller 4 adjusts the size of the air capacitor C6 while simultaneously detecting the forward and reverse power. The forward power is consistently maintained at around 100mW. When the tuner 3 operates at its low-efficiency point, the reverse power is close to 100mW, meaning the output power is close to total reflection. When the tuner 3 operates at its high-efficiency point, the reverse power is close to 1mW, at which point the motor stops rotating, and shortwave energy can be transmitted at its maximum efficiency. Changes in reverse power can also be detected in real time as the human body moves, triggering the controller 4 to adjust the motor rotation, thereby adjusting the size of the air capacitor C6 to achieve real-time, efficient shortwave energy transmission.

[0102] This application also provides a shortwave therapy device, including the above-mentioned automatic tuning device for the shortwave therapy device, and also includes electrode pads;

[0103] The electrode pads are connected to the output terminal of the tuner 3 of the automatic tuning device of the shortwave therapy instrument, and are used to output the AC signal after voltage reduction and impedance matching.

[0104] Please refer to the above embodiments for a description of the shortwave therapy device provided in this application, and it will not be repeated here.

[0105] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0106] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0107] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An automatic tuning device for a shortwave therapy instrument, characterized in that, include: A solid-state source, with its control terminal connected to the first output terminal of the controller and the first output terminal connected to the input terminal of the coupler, is used to generate an AC signal and output it to the coupler. The coupler has a first output terminal connected to the first input terminal of the controller and a second output terminal connected to the input terminal of the tuner. It is used to step down the AC signal and output it to the electrode plate through the tuner. It generates a DC feedback signal based on the AC signal and sends it to the controller. The value of the DC feedback signal is positively correlated with the value of the AC signal and negatively correlated with the degree of impedance matching. The tuner, with its output connected to the electrode plate, is used to adjust its impedance based on the adjustment signal output by the controller, so as to match the user's impedance when the electrode pads are attached. The controller is used to control the solid-state source to generate an AC signal and to generate an adjustment signal based on the DC feedback signal; The coupler includes a step-down module and a voltage conversion module; The input terminal of the step-down module serves as the input terminal of the coupler, the first output terminal of the step-down module is connected to the input terminal of the voltage conversion module, the output terminal of the voltage conversion module serves as the first output terminal of the coupler, and the second output terminal of the step-down module serves as the second output terminal of the coupler. The step-down module is used to step down the AC signal and output it to the tuner and the voltage conversion module. The voltage conversion module is used to convert the AC signal into a DC feedback signal that represents the forward power and the reverse power, and send it to the controller. The step-down module includes a first transformer, a second transformer, a first attenuation circuit, a second attenuation circuit, a first resistor, and a second resistor; The first end of the primary winding of the first transformer serves as the input terminal of the step-down module. The second end of the primary winding of the first transformer is connected to the first end of the secondary winding of the second transformer, and the common terminal of the connection serves as the second output terminal of the step-down module. The second end of the secondary winding of the second transformer is grounded. The first end of the secondary winding of the first transformer is connected to the first end of the second resistor and the input terminal of the first attenuation circuit. The second end of the secondary winding of the first transformer is connected to the first end of the first resistor and the input terminal of the second attenuation circuit. The second ends of the first resistor and the second resistor are connected to the first end of the primary winding of the second transformer. The second end of the secondary winding of the second transformer is grounded. The output terminals of the first attenuation circuit and the second attenuation circuit are both connected to the input terminal of the voltage conversion module. The first transformer and the second transformer are used to step down the AC signal, the first attenuation circuit and the second attenuation circuit are used to attenuate the signal amplitude and impedance of the AC signal, and the first resistor and the second resistor are used for bridge balancing.

2. The automatic tuning device of the shortwave therapy instrument as described in claim 1, characterized in that, The voltage conversion module includes a first diode and a second diode; The anode of the first diode is connected to the output terminal of the first attenuation circuit, and the cathode of the first diode is connected to the controller. The anode of the second diode is connected to the output terminal of the second attenuation circuit, and the cathode of the second diode is connected to the controller. Both the first diode and the second diode are used to convert the stepped-down and attenuated AC signal into a DC signal representing the forward and reverse power.

3. The automatic tuning device of the shortwave therapy instrument as described in claim 2, characterized in that, It also includes a first capacitor, a second capacitor, and a third capacitor; The first terminal of the first capacitor is connected to the first output terminal of the solid-state source, the second terminal of the first capacitor is connected to the input terminal of the step-down module, the first terminal of the second capacitor is connected to the cathode of the first diode, the second terminal of the second capacitor is grounded, the first terminal of the third capacitor is connected to the cathode of the second diode, and the second terminal of the third capacitor is grounded. The first capacitor is used to isolate the DC voltage output by the solid-state source, and the second and third capacitors are used for filtering.

4. The automatic tuning device of the shortwave therapy instrument as described in claim 1, characterized in that, The tuner includes a fixed matching module, an air capacitor, and a motor; The fixed matching module is connected to the air capacitor and the electrode plate respectively for impedance matching; The control terminal of the air capacitor is connected to the output terminal of the motor, and the control terminal of the motor is connected to the second output terminal of the controller. The motor is used to rotate under the control of the controller to drive the air capacitor to adjust its capacitance value.

5. The automatic tuning device of the shortwave therapy instrument as described in claim 4, characterized in that, The fixed matching module includes a fourth capacitor, a fifth capacitor, and a hollow inductor circuit. The common terminal of the first end of the fourth capacitor and the first end of the fifth capacitor is connected and serves as the input terminal of the tuner. The second ends of the fourth capacitor and the fifth capacitor are connected to the first end of the main signal link of the hollow inductor circuit. The second end of the main signal link is grounded. The first end of the first coupling link of the hollow inductor circuit is connected to the first end of the electrode plate. The second end of the first coupling link is connected to the first end of the air capacitor. The second end of the air capacitor is connected to the first end of the second coupling link of the hollow inductor circuit. The second end of the second coupling link is connected to the second end of the electrode plate. The fourth capacitor, the fifth capacitor, and the hollow inductor circuit are used to achieve impedance matching.

6. The automatic tuning device of the shortwave therapy instrument as described in claim 4, characterized in that, The air capacitor includes a rotating shaft, multiple moving plates fixed on the rotating shaft and rotating simultaneously with the rotating shaft, and multiple fixed plates fixed on the inner wall of the air capacitor body. The plane where each moving plate is located is parallel to the plane where each fixed plate is located and they are alternately distributed. The rotating shaft is connected to the output end of the motor. The rotating shaft is used to rotate based on the drive of the motor to move the moving plate. When multiple moving plates are all rotated between multiple fixed plates, the capacitance value of the air capacitor is at its maximum.

7. The automatic tuning device of the shortwave therapy instrument as described in any one of claims 1 to 6, characterized in that, The controller is specifically used to perform the following steps: The solid-state source is controlled to generate an AC signal; Receive the DC feedback signal returned by the coupler; When the signal value of the DC feedback signal is greater than the preset voltage, an adjustment signal is generated according to the preset correspondence between the signal value of the DC feedback signal, the capacitance value of the air capacitor in the tuner, and the rotation angle of the motor in the tuner. The adjustment signal is sent to the motor in the tuner so that the motor moves according to the rotation angle corresponding to the adjustment signal, driving the shaft of the air capacitor in the tuner to rotate. The value of the air capacitor changes, and thus the impedance of the tuner changes to achieve impedance matching.

8. A shortwave therapy device, characterized in that, The device includes an automatic tuning device for a shortwave therapy device as described in any one of claims 1 to 7, and also includes electrode pads; The electrode pad is connected to the output terminal of the tuner of the automatic tuning device of the shortwave therapy instrument, and is used to output the AC signal after voltage reduction and impedance matching.

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