Impedance matching method and impedance matching device for ultrasonic therapeutic apparatus

Abstract

The present invention provides an impedance matching method for an ultrasonic therapeutic apparatus, comprising: obtaining a rated load impedance value of a power amplification module; obtaining an impedance value of a transducer module; determining an expected impedance value to which the impedance matching module should transform the impedance value of the transducer module according to the rated load impedance value; determining the impedance matching module according to the impedance value of the transducer module and the expected impedance value; completing impedance matching of the ultrasonic therapeutic apparatus; performing preliminary impedance matching through a pre-conversion unit composed of multiple transformers of the impedance matching module and completing impedance matching of the ultrasonic therapeutic apparatus through a compensating conversion unit, i.e., an inductor-capacitor impedance, thereby overcoming the problem of using only a single impedance matching network under high power, high current and high frequency conditions, i.e., the inability to match the expected impedance value using only a conversion unit composed of transformers, and the problem of a lack of suitable inductors on the market and large volume of self-made inductors when using only an inductor-capacitor impedance matching network.

Description

Technical Field

[0001] The present invention relates to the field of ultrasonic therapy, and in particular to an impedance matching method and an impedance matching device for ultrasonic therapy. Background Art

[0002] The impedance of the transducer module, i.e. the transducer, of a high-power ultrasonic therapeutic device is usually low, such as 0.3Ω to 4Ω, while the rated load of high-power high-frequency signal generators and high-frequency signal power amplifiers on the market is usually 50Ω. Therefore, the impedance of the transducer of the high-power ultrasonic therapeutic device must be matched to about 50Ω in order to be compatible with the rated load impedance value required by the high-power high-frequency signal generator or high-frequency signal power amplifier. Otherwise, the output power of the high-power high-frequency signal generator or high-frequency signal power amplifier will not reach the rated value, and the high-power high-frequency signal generator and high-frequency signal power amplifier will be easily damaged. The inductor in the conventional inductor-capacitor impedance matching network is difficult to meet the simultaneous requirements of inductance value at high power, stability of inductance value under high current, high current, high frequency and narrow space. Summary of the Invention

[0003] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide an impedance matching method and an impedance matching device for an ultrasonic therapeutic apparatus, which are used to solve the problem that the inductor in the inductor-capacitor impedance matching network of the ultrasonic therapeutic apparatus in the prior art is difficult to meet the simultaneous requirements of the inductance value at high power, the stability of the inductance value under high current, high current, high frequency and narrow space.

[0004] To achieve the above-mentioned and other related purposes, the present invention provides an impedance matching method for an ultrasonic therapeutic apparatus, comprising:

[0005] Get the rated load impedance value of the power amplifier module;

[0006] Obtain the impedance value of the transducer module;

[0007] Determining, based on the rated load impedance value, an expected impedance value to which the impedance matching module should transform the impedance value of the transducer module;

[0008] Determining the impedance matching module according to the impedance value of the transducer module and the expected impedance value;

[0009] Impedance matching of the ultrasonic therapeutic apparatus is completed.

[0010] Optionally, the impedance matching module includes a pre-conversion unit and a compensation conversion unit, the input end of the compensation conversion unit is connected to the output module of the power amplification module, and the output end of the compensation conversion unit is connected to the input end of the pre-conversion unit, wherein the pre-conversion unit includes at least one transformer, and determining the impedance matching module according to the impedance value of the transducer module and the expected impedance value includes:

[0011] The number of transformers of the pre-transformation unit is determined according to the impedance value of the energy conversion module and the expected impedance value, wherein the number of transformers satisfies the following formula:

[0012]

[0013] Where n is a natural number, and n takes the maximum value that satisfies the inequality; R L Re represents the real part of the impedance value of the transducer module, and Re is the expected impedance value.

[0014] Optionally, the method includes determining whether a real part of an impedance value presented at an input end of the pre-conversion unit is the same as a real part of the expected impedance value;

[0015] If the real part of the impedance value presented at the input end of the pre-conversion unit is the same as the real part of the expected impedance value, determining whether the absolute value of the imaginary part of the impedance value presented at the input end of the pre-conversion unit meets a preset condition;

[0016] If the absolute value of the imaginary part value presented at the input end of the pre-conversion unit meets the preset condition, the impedance matching of the ultrasonic therapeutic apparatus is completed;

[0017] If the absolute value of the imaginary part value presented at the input end of the pre-transformation unit does not meet the preset condition, determining whether the imaginary part value presented at the input end of the pre-transformation unit is a positive value or a negative value;

[0018] If the imaginary part value presented at the input terminal of the pre-conversion unit is a positive value, the compensation conversion unit is a series capacitor structure, and the capacitance value of the compensation conversion unit satisfies the following conditions:

[0019] c=1 / (2πfX1);

[0020] If the imaginary part value presented at the input end of the pre-conversion unit is a negative value, the compensation conversion unit is a series inductor structure, and the inductance value of the compensation conversion unit satisfies the following conditions

[0021] L=X1 / (2πf)

[0022] Wherein, X1 is the imaginary part value presented at the input end of the pre-transformation unit, and f is the resonant frequency of the energy conversion module.

[0023] Optionally, if the real part of the impedance value presented at the input end of the pre-conversion unit is smaller than the real part of the expected impedance value, the compensation conversion unit includes a capacitor element and an inductor element, one end of the inductor element is connected to the output end of the power amplifier module, the other end of the inductor element is connected to the input end of the pre-conversion unit, one end of the capacitor element is connected to the output end of the power amplifier module, and the other end of the capacitor element is grounded.

[0024] Optionally, the inductance of the inductor element satisfies the following formula:

[0025]

[0026] The capacitance value of the capacitor element satisfies the following formula:

[0027]

[0028] Among them, L1 is the inductance value of the inductance element of the compensation conversion unit; C1 is the capacitance value of the capacitance element of the compensation conversion unit; Re1 is the real part value of the impedance value presented at the input end of the pre-conversion unit; Re is the expected impedance value; f is the resonant frequency of the transducer module, and X1 is the imaginary part value presented at the input end of the pre-conversion unit.

[0029] The present invention also provides an impedance matching device for an ultrasonic therapeutic apparatus, comprising a signal generating module, a power amplifying module electrically connected to the signal generating module, an impedance matching module electrically connected to the power amplifying module, and a transducer module electrically connected to the impedance matching module, wherein the impedance matching module comprises:

[0030] a pre-conversion unit, one end of which is electrically connected to the positive end of the energy conversion module, and the pre-conversion unit includes at least one transformer;

[0031] A compensation conversion unit, wherein the compensation conversion unit includes an inductor and / or a capacitor; when the compensation conversion unit only includes an inductor, one end of the inductor element is electrically connected to the other end of the pre-conversion unit, and the other end of the inductor element is electrically connected to the power amplifier module; when the compensation conversion unit only includes a capacitor, one end of the capacitor element is electrically connected to the other end of the pre-conversion unit, and the other end of the capacitor element is electrically connected to the power amplifier module; when the compensation conversion unit includes an inductor and a capacitor, one end of the inductor element in the compensation conversion unit is electrically connected to the other end of the pre-conversion unit, the other end of the inductor element is electrically connected to one end of the capacitor element in the compensation conversion unit, and the other end of the capacitor element is grounded; in the compensation conversion unit, the negative end of the transducer module is grounded.

[0032] Optionally, the transformer is a transmission line transformer.

[0033] Optionally, there are multiple transmission line transformers, each of which includes a primary and a secondary. The primary of each transmission line transformer includes a primary input terminal and a primary output terminal, and the secondary of each transmission line transformer includes a secondary non-inverting terminal and a secondary anti-inverting terminal, wherein:

[0034] The primary input end of the first transmission line transformer is electrically connected to the output end of the compensation conversion unit, the primary output end of the first transmission line transformer is electrically connected to the primary input end of the second transmission line transformer, the primary output end of the second transmission line transformer is electrically connected to the primary input end of the third transmission line transformer, and so on, the primary output end of the n-1th transmission line transformer is electrically connected to the primary input end of the nth transmission line transformer, and the primary output end of the nth transmission line transformer is electrically connected to the positive end of the energy conversion module;

[0035] The secondary in-phase ends of the first transmission line transformer to the nth transmission line transformer are electrically connected to the positive end of the transducer module, and the secondary inverting ends of the first transmission line transformer to the nth transmission line transformer are electrically connected to the negative end of the transducer module.

[0036] Optionally, the transmission line transformer includes a winding and a magnetic core, multiple transmission line transformers share one magnetic core, the magnetic core includes multiple hollow circular and / or square magnetic rings, and the inductance element of the compensation conversion unit includes a winding with a reserved length and shares at least one transmission line transformer magnetic ring.

[0037] Optionally, the winding of the transmission line transformer is a coaxial cable.

[0038] Optionally, the coaxial cable includes a coaxial cable core and a shielding layer, wherein the coaxial cable core is the primary of the transmission line transformer, and the shielding layer is the secondary of the transmission line transformer.

[0039] Optionally, the winding of the transmission line transformer is a twisted pair, the winding formed by one strand of the twisted pair is the primary of the transmission line transformer, and the winding formed by the other strand is the secondary of the transformer.

[0040] Optionally, gaps are left between the plurality of magnetic rings, and the gaps are not less than the wire diameter of the winding wire of the reserved length of the inductor element.

[0041] The present invention also provides an ultrasonic therapeutic apparatus, comprising:

[0042] The above-mentioned impedance matching device of the ultrasonic therapeutic apparatus; and a shell, the impedance matching module and the transducer module of the impedance matching device of the ultrasonic therapeutic apparatus are arranged in the shell, and the impedance matching module is electrically connected to the transducer module.

[0043] As described above, the impedance matching method and impedance matching device of the ultrasonic therapeutic apparatus of the present invention perform preliminary impedance matching through the pre-conversion unit composed of multiple transformers of the impedance matching module and complete the impedance matching of the ultrasonic therapeutic apparatus through the compensation conversion unit, i.e., the inductor and capacitor impedance, thereby overcoming the problems existing in using only a single impedance matching network under high power, high current and high frequency conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 Shown is a flow chart of an impedance matching method for an ultrasonic therapeutic apparatus according to the present invention.

[0045] Figure 2 Shown is a block diagram of an impedance matching device of an ultrasonic therapeutic apparatus according to the present invention.

[0046] Figure 3 Shown is a block diagram of an impedance matching device of an ultrasonic therapeutic apparatus according to the present invention.

[0047] Figure 4 Shown is a partial structural diagram of an impedance matching device of an ultrasonic therapeutic apparatus according to the present invention.

[0048] Figure 5 Shown is a structural diagram of an impedance matching module of an impedance matching device of an ultrasonic therapeutic apparatus according to the present invention.

[0049] Figure 6 Shown is a structural diagram of a treatment head of an ultrasonic therapeutic apparatus according to the present invention.

[0050] Component number description

[0051] 10 Signal generation module

[0052] 20 Power amplifier module

[0053] 30 Impedance matching module

[0054] 31 Pre-transformation unit

[0055] 33 Compensation conversion unit

[0056] 300 core

[0057] 301-307 Magnetic Ring

[0058] 40 transducer module

[0059] 100 Impedance matching module and transducer module connection line

[0060] 101 Input terminal of impedance matching module

[0061] 102 housing

[0062] Steps S10 to S50 DETAILED DESCRIPTION

[0063] The following describes the embodiments of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. The details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other unless they conflict.

[0064] It should be noted that the illustrations provided in the following embodiments are merely schematic illustrations of the basic concept of the present invention. Therefore, the illustrations only show components related to the present invention and are not drawn according to the number, shape, and size of components in actual implementation. In actual implementation, the type, quantity, and proportion of each component may be changed arbitrarily, and the component layout may also be more complex.

[0065] See also Figure 1 The present invention provides an impedance matching method for an ultrasonic therapeutic apparatus, which is characterized by comprising:

[0066] S10: Obtain the rated load impedance value of the power amplifier module;

[0067] S20: Obtaining the impedance value of the transducer module;

[0068] S30: determining an expected impedance value to which the impedance matching module should transform the impedance value of the transducer module according to the rated load impedance value;

[0069] S40: determining the impedance matching module according to the impedance value of the transducer module and the expected impedance value;

[0070] S50: completing impedance matching of the ultrasonic therapeutic apparatus.

[0071] It can be understood that the expected impedance value is to make the transducer module, i.e., the transducer and the power amplification module work in the best state. The impedance matching module corresponds to the equivalent impedance value of the transducer module after the impedance value of the transducer module is transformed and connected in series with the impedance matching module. In general, the expected impedance value can be approximately equal to the rated load impedance value of the power amplification module.

[0072] In some embodiments, the impedance matching module includes a pre-conversion unit and a compensation conversion unit, the input end of the compensation conversion unit is connected to the output module of the power amplification module, and the output end of the compensation conversion unit is connected to the input end of the pre-conversion unit, wherein the pre-conversion unit includes at least one transformer, and the impedance matching module is determined according to the impedance value of the transducer module and the expected impedance value, including:

[0073] The number of transformers of the pre-transformation unit is determined according to the impedance value of the energy conversion module and the expected impedance value, wherein the number of transformers satisfies the following formula:

[0074]

[0075] Where n is a natural number, and n takes the maximum value that satisfies the inequality; R L Re represents the real part of the impedance value of the transducer module, and Re is the expected impedance value.

[0076] It is understandable that the rated load impedance value of the power amplifier module and the impedance value of the transducer module can be obtained through a network analyzer or an impedance tester, but the acquisition method is not limited thereto.

[0077] In some embodiments, the method includes determining whether a real part of an impedance value presented at an input terminal of the pre-transformation unit is the same as a real part of the expected impedance value;

[0078] If the real part of the impedance value presented at the input end of the pre-conversion unit is the same as the real part of the expected impedance value, determining whether the absolute value of the imaginary part of the impedance value presented at the input end of the pre-conversion unit meets a preset condition;

[0079] If the absolute value of the imaginary part value presented at the input end of the pre-conversion unit meets the preset condition, the impedance matching of the ultrasonic therapeutic apparatus is completed;

[0080] If the absolute value of the imaginary part value presented at the input end of the pre-transformation unit does not meet the preset condition, determining whether the imaginary part value presented at the input end of the pre-transformation unit is a positive value or a negative value;

[0081] If the imaginary part value presented at the input terminal of the pre-conversion unit is a positive value, the compensation conversion unit is a series capacitor structure, and the capacitance value of the compensation conversion unit satisfies the following conditions:

[0082] c=1 / (2πfX1);

[0083] If the imaginary part value presented at the input end of the pre-conversion unit is a negative value, the compensation conversion unit is a series inductor structure, and the inductance value of the compensation conversion unit satisfies the following conditions

[0084] L=X1 / (2πf)

[0085] Wherein, X1 is the imaginary part value presented at the input end of the pre-transformation unit, and f is the resonant frequency of the energy conversion module.

[0086] In some embodiments, if the real part of the impedance value presented at the input end of the pre-conversion unit is less than the real part of the expected impedance value, the compensation conversion unit includes a capacitor element and an inductor element, one end of the inductor element is connected to the output end of the power amplifier module, the other end of the inductor element is connected to the input end of the pre-conversion unit, one end of the capacitor element is connected to the output end of the power amplifier module, and the other end of the capacitor element is grounded.

[0087] It is understandable that the above preset condition can be zero, or approximately zero, that is, within a range, such as -0.1 to 0.1. In practice, the preset condition can be selected according to the accuracy requirement, and it is generally better for the preset condition to be approximately zero.

[0088] In some embodiments, the inductance of the inductor element satisfies the following formula:

[0089]

[0090] The capacitance value of the capacitor element satisfies the following formula:

[0091]

[0092] Among them, L1 is the inductance value of the inductance element of the compensation conversion unit; C1 is the capacitance value of the capacitance element of the compensation conversion unit; Re1 is the real part value of the impedance value presented at the input end of the pre-conversion unit; Re is the expected impedance value; f is the resonant frequency of the transducer module, and X1 is the imaginary part value presented at the input end of the pre-conversion unit.

[0093] It can be understood that X1 is the imaginary part of the impedance value of the transducer module after the pre-transformation unit of the impedance matching module transforms the impedance value, where a positive value represents inductive reactance and a negative value represents capacitive reactance.

[0094] See also Figure 2-Figure 3 The present invention further provides an impedance matching device for an ultrasonic therapeutic apparatus, comprising a signal generating module, a power amplifying module 20 electrically connected to the signal generating module, an impedance matching module 30 electrically connected to the power amplifying module 20, and a transducer module 40 electrically connected to the impedance matching module 30, wherein the impedance matching module 30 comprises:

[0095] A pre-conversion unit 31, one end of which is electrically connected to the positive end of the energy conversion module 40, and the pre-conversion unit includes at least one transformer;

[0096] a compensating conversion unit 33, one end of the compensating conversion unit 33 being electrically connected to the other end of the pre-conversion unit 31, and the compensating conversion unit including an inductor and / or a capacitor;

[0097] The negative terminal of the energy conversion module 40 is grounded.

[0098] In some embodiments, one end of the compensating conversion unit 33 is electrically connected to the other end of the pre-conversion unit 31, and the other end of the compensating conversion unit 33 is electrically connected to the power amplification module 20; wherein, when the compensating conversion unit 33 only includes an inductor, one end of the inductor element is electrically connected to the other end of the pre-conversion unit 31, and the other end of the inductor element is electrically connected to the power amplification module 20; when the compensating conversion unit 33 only includes a capacitor, one end of the capacitor element is electrically connected to the other end of the pre-conversion unit 31, and the other end of the capacitor element is electrically connected to the power amplification module 20; when the compensating conversion unit 33 includes an inductor and a capacitor, one end of the inductor element in the compensating conversion unit 33 is electrically connected to the other end of the pre-conversion unit 31, the other end of the inductor element is electrically connected to one end of the capacitor element in the compensating conversion unit 31 and electrically connected to the output end of the power amplification module 20, and the other end of the capacitor element is grounded.

[0099] It can be understood that the input end of the compensation conversion unit 33 is electrically connected to the output end of the power amplification module 20 , and the output end of the compensation conversion unit 33 is electrically connected to the input end of the pre-conversion unit 31 .

[0100] See also Figure 3-4 In some embodiments, when the real part of the impedance value of the pre-transformation unit 31 of the impedance matching module 30 is different from the real part of the expected impedance value, the inductance and capacitance elements of the compensation transformation unit 33 of the impedance matching module 30 compensate for the impedance value of the pre-transformation unit 31; wherein, the expected impedance value is the transformation result of the impedance matching module 30 on the impedance value of the transducer module 40.

[0101] In some embodiments, the inductance value of the inductor element of the compensation conversion unit 33 satisfies the following formula:

[0102]

[0103] Wherein, L is the inductance of the inductor element of the compensation conversion unit 33; Re1 is the real part of the impedance value of the transducer module 40 after the pre-conversion unit 31 of the impedance matching module 30 transforms the impedance value; X1 is the imaginary part of the impedance value of the transducer module 40 after the pre-conversion unit 31 of the impedance matching module 30 transforms the impedance value of the transducer module 40, with a positive value representing inductive reactance and a negative value representing capacitive reactance; Re is the real part of the desired impedance value; and f is the resonant frequency of the transducer module 40. It will be understood that the above formula is only one way to obtain the inductance value, and the calculation of the inductance value of the inductor element is not limited to the above formula.

[0104] The capacitance value of the capacitive element of the compensation conversion unit 33 satisfies the following formula:

[0105]

[0106] Wherein, C is the capacitance value of the capacitor element of the compensation conversion unit 33; Re1 is the real part of the impedance value of the transducer module 40 after the pre-conversion unit 31 of the impedance matching module 30 transforms the impedance value; Re is the real part of the desired impedance value; and f is the resonant frequency of the transducer module 40. It will be understood that the above formula is only one way to obtain the capacitance value, and the calculation of the capacitance value of the capacitor element is not limited to the above formula.

[0107] See also Figure 4 as well as Figure 5 In some embodiments, the transformer is a transmission line transformer, and the number of the transformers satisfies the following formula:

[0108]

[0109] Where n is a natural number, n takes the maximum value that satisfies the inequality, R L Re represents the real part of the impedance of the transducer module 40 , and Re represents the expected value after the impedance matching module 30 transforms the impedance of the transducer module 40 .

[0110] See also Figure 4 and Figure 5 In some embodiments, the transmission line transformer includes a winding and a magnetic core 300, and multiple transmission line transformers share one magnetic core 300. The magnetic core 300 includes multiple hollow circular or / and square magnetic rings. The inductance element of the compensation conversion unit includes a winding with a reserved length and shares at least one magnetic ring 300.

[0111] In certain embodiments, the winding of the transmission line transformer is a coaxial cable.

[0112] It can be understood that in some embodiments, the coaxial cable includes a coaxial cable core and a shielding layer, wherein the coaxial cable core is the primary of the transmission line transformer and the shielding layer is the secondary of the transmission line transformer.

[0113] In some embodiments, the winding of the transmission line transformer is a twisted pair of wires, a winding formed by one wire of the twisted pair of wires serves as the primary of the transmission line transformer, and a winding formed by the other wire of the twisted pair of wires serves as the secondary of the transformer.

[0114] In some embodiments, there are multiple transmission line transformers, each of which includes a primary and a secondary. The primary of each transmission line transformer includes a primary input terminal and a primary output terminal, and the secondary of each transmission line transformer includes a secondary non-inverting terminal and a secondary anti-inverting terminal, wherein: the primary input terminal of the first transmission line transformer T1 is electrically connected to the output terminal of the compensation conversion unit 33, the primary output terminal of the first transmission line transformer T1 is electrically connected to the primary input terminal of the second transmission line transformer T2, and the primary output terminal of the second transmission line transformer T2 is electrically connected to the primary input terminal of the first transmission line transformer T1. The primary input ends of the three transmission line transformers T3 are electrically connected, and so on, the primary output end of the n-1th transmission line transformer is electrically connected to the primary input end of the nth transmission line transformer Tn, and the primary output end of the nth transmission line transformer Tn is electrically connected to the positive end of the energy conversion module 40; the secondary in-phase ends of the first transmission line transformer T1 to the nth transmission line transformer Tn are electrically connected to the positive end of the energy conversion module 40, and the secondary inverting ends of the first transmission line transformer T1 to the nth transmission line transformer Tn are electrically connected to the negative end of the energy conversion module 40. It can be understood that the primary ends of the transmission line transformers in the pre-conversion unit are electrically connected in sequence, the primary output end of the last transmission line transformer is electrically connected to the positive end of the transducer module 40, the in-phase end of the secondary of each transmission line transformer is electrically connected to the positive end of the transducer module 40, and the reverse end of the secondary of each transmission line transformer is electrically connected to the negative end of the transducer module 40, that is, the reverse end of the secondary of each transmission line transformer and the negative end of the transducer module 40 are grounded. In some embodiments, the reverse end of the secondary of each transmission line transformer and the negative end of the transducer module 40 can all be connected to the same potential, which is not limited here.

[0115] See also Figure 5There are gaps between the multiple magnetic rings, and the gaps between the magnetic rings 301, 302, 303, 304, 305, 306 and 307 are not less than the wire diameter of the reserved length of the winding of the inductor element. It can be understood that in some embodiments, at least the gap between the magnetic ring 301 and the magnetic ring 302 or the magnetic ring 306 and the magnetic ring 307 must be no less than the winding wire diameter of the inductor element.

[0116] In this way, a transmission line transformer is used, the magnetic core of the transmission line transformer includes multiple magnetic rings, and the inductor element shares part of the magnetic core of the transmission line transformer. There is no need to set up independent inductor elements separately, which is simple to operate and saves costs.

[0117] In some embodiments, an inductor element independent of the transmission line transformer may also be selected. There is no limitation on the configuration of the inductor element.

[0118] See also Figure 4 and Figure 5 In some embodiments, the pre-conversion unit 31 includes multiple transmission line transformers, and the winding direction of the transmission line transformer is wound from the "1" end to the "2" end; it can be understood that the "1" end is the input end of the pre-conversion unit 31 and the "2" end is the output end of the pre-conversion unit 31; when the real part of the impedance value of the pre-conversion unit 31 is less than the real part of the expected impedance value, the reserved length of the winding is magnetically wound along the winding direction of the transmission line transformer, that is, the winding at the "1" end has a reserved length, and the winding at the "1" end is wound along the magnetic ring 301 and the magnetic ring 302 to form the inductance element of the compensation conversion unit 33; when the real part of the impedance value of the pre-conversion unit 31 is greater than the real part of the expected impedance value, the reserved length of the winding is magnetically wound against the winding direction of the transmission line transformer.

[0119] In this way, the magnetic core 300 is composed of multiple magnetic rings, and the impedance matching module 30 can be set to a circle or a polygon. The user can make matching settings according to the shape of the treatment head of the ultrasonic therapeutic device, which makes the operation more flexible.

[0120] The present invention also provides an ultrasonic therapeutic apparatus, comprising: the impedance matching device of the ultrasonic therapeutic apparatus described above; and a housing, wherein the impedance matching module 30 and the transducer module 40 of the impedance matching device of the ultrasonic therapeutic apparatus are arranged in the housing. It is understandable that the ultrasonic therapeutic apparatus described above may also include a power supply, a display module, a key module, a processor for drive control, and a memory, wherein the memory may include a random access memory (RAM) or a non-volatile memory (non-volatile memory), such as at least one disk memory; the processor described above may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components.

[0121] See also Figure 6 , Figure 6 The present invention provides an ultrasonic therapeutic head of an ultrasonic therapeutic apparatus, comprising an electrical connection line 100 between an impedance matching module 30 and a transducer module 40, an input end 101 of the impedance matching module 30, and a housing 102. The impedance matching module 30 and the transducer module 40 are integrated into one housing 102, thereby reducing the cross-sectional area of ​​the connection line between the impedance matching module 30 and the power amplification module 20 and reducing interference during signal transmission.

[0122] As described above, the impedance matching device of the ultrasonic therapeutic apparatus of the present invention obtains the rated load impedance value of the power amplifier module 20; obtains the impedance value of the transducer module 40; obtains the desired impedance value after the impedance of the transducer module 40 is transformed by the impedance matching module 30 based on the rated load impedance value; obtains the component parameters of the impedance matching module 30; and completes the impedance matching of the ultrasonic therapeutic apparatus through the pre-transformation unit 31 and the compensation transformation unit 33 of the impedance matching module 30. The impedance matching device of the ultrasonic therapeutic apparatus of the present invention performs preliminary impedance matching through the pre-transformation unit composed of multiple transformers of the impedance matching module and completes the impedance matching of the ultrasonic therapeutic apparatus through the compensation transformation unit, i.e., the inductor-capacitor impedance matching network, thereby overcoming the problems existing in using only a single impedance matching network under high power, high current, and high frequency conditions.

[0123] The impedance matching device of the ultrasonic therapeutic apparatus provided by the present invention can improve the efficiency of electroacoustic conversion. While the impedance matching module 30 of the present invention includes multiple transformers, the present invention adopts a transmission line transformer, and the magnetic core 300 includes multiple magnetic rings. This makes the impedance matching module 30 smaller and more flexible in shape. Therefore, it can be directly integrated with the transducer module 40 in a single housing, reducing the cross-sectional area of ​​the connection between the impedance matching module and the power amplification module and reducing interference during signal transmission. The present invention effectively overcomes various shortcomings of the prior art and has high industrial application value.

Claims

1. An impedance matching method for an ultrasonic therapeutic apparatus, characterized in that: include: Get the rated load impedance value of the power amplifier module; Obtain the impedance value of the transducer module; Determining, based on the rated load impedance value, an expected impedance value to which the impedance matching module should transform the impedance value of the transducer module, wherein the expected impedance value is used to enable the transducer module and the power amplification module to operate in an optimal state, and the expected impedance value is a result of transforming the impedance value of the transducer module by the impedance matching module; The impedance matching module is determined according to the impedance value of the transducer module and the expected impedance value, including determining the number of transformers of the pre-transformation unit according to the impedance value of the transducer module and the expected impedance value, wherein the impedance matching module includes a pre-transformation unit and a compensation transformation unit, the pre-transformation unit includes at least one transformer, and the number of the transformers satisfies the following formula: ； Where n is a natural number, and n takes the maximum value that satisfies the inequality; Re represents the real part of the impedance value of the transducer module, and Re is the expected impedance value; Impedance matching of the ultrasonic therapeutic apparatus is completed.

2. The impedance matching method of ultrasonic therapeutic apparatus according to claim 1, characterized in that: The input end of the compensation conversion unit is connected to the output module of the power amplification module, the output end of the compensation conversion unit is connected to the input end of the pre-conversion unit, and the output end of the pre-conversion unit is connected to the positive end of the transducer module.

3. The impedance matching method of ultrasonic therapeutic apparatus according to claim 2, characterized in that: The method comprises determining whether a real part of an impedance value presented at an input end of the pre-conversion unit is the same as a real part of the expected impedance value; If the real part of the impedance value presented at the input end of the pre-conversion unit is the same as the real part of the expected impedance value, determining whether the absolute value of the imaginary part of the impedance value presented at the input end of the pre-conversion unit meets a preset condition; If the absolute value of the imaginary part value presented at the input end of the pre-conversion unit meets the preset condition, the impedance matching of the ultrasonic therapeutic apparatus is completed; If the absolute value of the imaginary part value presented at the input end of the pre-transformation unit does not meet the preset condition, determining whether the imaginary part value presented at the input end of the pre-transformation unit is a positive value or a negative value; If the imaginary part value presented at the input terminal of the pre-conversion unit is a positive value, the compensation conversion unit is a series capacitor structure, and the capacitance value of the compensation conversion unit satisfies the following conditions: ； If the imaginary part value presented at the input end of the pre-conversion unit is a negative value, the compensation conversion unit is a series inductor structure, and the inductance value of the compensation conversion unit satisfies the following conditions Wherein, X1 is the imaginary part value presented at the input end of the pre-transformation unit, and f is the resonant frequency of the energy conversion module.

4. The impedance matching method of ultrasonic therapeutic apparatus according to claim 3, characterized in that: If the real part of the impedance value presented at the input end of the pre-conversion unit is less than the real part of the expected impedance value, the compensation conversion unit includes a capacitor element and an inductor element, one end of the inductor element is connected to the output end of the power amplifier module, the other end of the inductor element is connected to the input end of the pre-conversion unit, one end of the capacitor element is connected to the output end of the power amplifier module, and the other end of the capacitor element is grounded.

5. The impedance matching method of ultrasonic therapeutic apparatus according to claim 4, characterized in that: The inductance value of the inductor element satisfies the following formula: ； The capacitance value of the capacitor element satisfies the following formula: ； Among them, L1 is the inductance value of the inductance element of the compensation conversion unit; C1 is the capacitance value of the capacitance element of the compensation conversion unit; Re1 is the real part value of the impedance value presented at the input end of the pre-conversion unit; Re is the expected impedance value; f is the resonant frequency of the transducer module, and X1 is the imaginary part value of the impedance value presented at the input end of the pre-conversion unit.

6. An impedance matching device for an ultrasonic therapeutic apparatus, characterized in that: The system comprises a signal generating module, a power amplifying module electrically connected to the signal generating module, an impedance matching module electrically connected to the power amplifying module, and a transducer module electrically connected to the impedance matching module, wherein the impedance matching module comprises: a pre-conversion unit, one end of which is electrically connected to the positive end of the energy conversion module, and the pre-conversion unit includes at least one transformer; A compensating conversion unit, the compensating conversion unit including an inductor and / or a capacitor, one end of the compensating conversion unit being electrically connected to the other end of the pre-conversion unit, and the other end of the compensating conversion unit being electrically connected to the power amplification module; When the compensation conversion unit only includes an inductor, one end of the inductor is electrically connected to the other end of the pre-conversion unit, and the other end of the inductor is electrically connected to the power amplification module; When the compensation conversion unit only includes a capacitor, one end of the capacitor is electrically connected to the other end of the pre-conversion unit, and the other end of the capacitor is electrically connected to the power amplification module; When the compensation conversion unit includes an inductor and a capacitor, one end of the inductor element in the compensation conversion unit is electrically connected to the other end of the pre-conversion unit, the other end of the inductor element is electrically connected to one end of the capacitor element in the compensation conversion unit, and the other end of the capacitor element is grounded; the compensation conversion unit The negative terminal of the energy conversion module is grounded.

7. The impedance matching device of the ultrasonic therapeutic apparatus according to claim 6, characterized in that: The transformer is a transmission line transformer.

8. The impedance matching device of the ultrasonic therapeutic apparatus according to claim 7, characterized in that: There are multiple transmission line transformers, each of which includes a primary and a secondary. The primary of each transmission line transformer includes a primary input terminal and a primary output terminal, and the secondary of each transmission line transformer includes a secondary non-inverting terminal and a secondary anti-inverting terminal, wherein: The primary input end of the first transmission line transformer is electrically connected to the output end of the compensation conversion unit, the primary output end of the first transmission line transformer is electrically connected to the primary input end of the second transmission line transformer, the primary output end of the second transmission line transformer is electrically connected to the primary input end of the third transmission line transformer, and so on, the primary output end of the n-1th transmission line transformer is electrically connected to the primary input end of the nth transmission line transformer, and the primary output end of the nth transmission line transformer is electrically connected to the positive end of the energy conversion module; The secondary in-phase end of the first transmission line transformer to the nth transmission line transformer is electrically connected to the positive end of the transducer module, and the secondary inverting end of the first transmission line transformer to the nth transmission line transformer is electrically connected to the negative end of the transducer module, where n is a natural number.

9. The impedance matching device of the ultrasonic therapeutic apparatus according to claim 7, characterized in that: The transmission line transformer includes a winding and a magnetic core. Multiple transmission line transformers share one magnetic core. The magnetic core includes multiple hollow circular or / and square magnetic rings. The inductor element of the compensation conversion unit includes a winding with a reserved length and shares at least one transformer magnetic ring.

10. The impedance matching device of the ultrasonic therapeutic apparatus according to claim 7, characterized in that: The winding of the transmission line transformer is a coaxial cable.

11. The impedance matching device of the ultrasonic therapeutic apparatus according to claim 10, characterized in that: The coaxial cable includes a coaxial cable core and a shielding layer, wherein the coaxial cable core is the primary of the transmission line transformer and the shielding layer is the secondary of the transmission line transformer.

12. The impedance matching device of the ultrasonic therapeutic apparatus according to claim 7, characterized in that: The winding of the transmission line transformer is a twisted pair of wires, a winding formed by one of the wires of the twisted pair of wires is the primary of the transmission line transformer, and a winding formed by the other wire of the twisted pair of wires is the secondary of the transformer.

13. The impedance matching device of the ultrasonic therapeutic apparatus according to claim 9, characterized in that: There is a gap between the plurality of magnetic rings, and the gap is not less than the wire diameter of the winding wire of the reserved length of the inductor element.

14. An ultrasonic therapeutic apparatus, characterized in that: include: The impedance matching device of the ultrasonic therapeutic apparatus according to any one of claims 6 to 13; and a shell, the impedance matching module and the transducer module of the impedance matching device of the ultrasonic therapeutic apparatus are arranged in the shell, and the impedance matching module is electrically connected to the transducer module.

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