Treatment equipment for radio frequency beauty instrument and radio frequency beauty instrument

Abstract

The utility model relates to a treatment device and a radio frequency beauty instrument using the same, the treatment device comprises a detachable cold air tank, a control module, a touch screen, a radio frequency power amplification circuit, an automatic boost-buck power supply module, a power supply module and a switching interface, the control module is electrically connected with the touch screen and the automatic boost-buck power supply module; the input end of the radio frequency power amplification circuit is connected with the output end of the automatic buck-boost power supply module, the output end of the radio frequency power amplification circuit is connected with the adapter interface, and the radio frequency power amplification circuit is a symmetrical series-parallel resonance circuit and comprises a high-frequency isolation transformer, a third inductor, a capacitor and a parallel resonance circuit. The input end of the parallel resonance circuit is connected with the output end of the automatic buck-boost power supply module, the parallel resonance circuit is composed of a first circuit and a second circuit which are arranged in parallel, and each of the first circuit and the second circuit comprises a universal capacitor, a resonant capacitor, a switching tube and an inductor. The capacitor, the general capacitor, the resonant capacitor, the switching tube and the third inductor form a resonant cavity of the whole circuit topology.

Description

TECHNICAL FIELD

[0001] The utility model relates to medical equipment technical field especially, relates to a kind of treatment equipment for radio frequency beauty instrument and radio frequency beauty instrument using the treatment equipment. BACKGROUND

[0002] Radio frequency beauty technology is through the effect of radio frequency energy on skin and fat tissue, makes tissue temperature rise and promotes protein regeneration and fat dissolution and other biological effects. The current mature product in this field has Thermage, which acts on tissue through capacitive coupling of radio frequency energy, and combines cooling technology, which can effectively reduce thermal damage while heating target tissue.

[0003] But in the process of radio frequency energy and tissue interaction, there are usually the following problems: 1) Because the impedance between the action probe and the human skin is constantly changing, the device needs to be able to achieve high frequency and high power output under a wide range of impedance. 2) Due to the existence of skin effect, there is a certain difference in current density between the periphery of the action probe electrode and the center of the electrode, which causes certain thermal damage to the skin.

[0004] Chinese patent CN 118121830 A discloses a precise and rapid tuning circuit for a radio frequency beauty instrument. It includes a direct current power supply, a radio frequency power amplifier, a radio frequency current detection unit, a continuously adjustable inductance unit, a radio frequency load unit and a controller. The direct current power supply and the radio frequency power amplifier are connected. The radio frequency power amplifier, the radio frequency current detection unit, the continuously adjustable inductance unit and the radio frequency load unit are connected in sequence to form a radio frequency power output loop. The radio frequency current detection unit is connected to the controller and sends the detection results to the controller. The controller controls the inductance value of the continuously adjustable inductance unit according to the detection results to make the radio frequency power output loop in series resonance state. The patent collects the real-time changes of radio frequency current through the controller, and then controls the continuously adjustable inductance unit to change its inductance value, so that the loop current value changes constantly until the maximum loop current value is found, and the radio frequency power output loop reaches resonance state. But this method has the following problems: 1) The circuit topology is only a simple series resonance, and the single resonance cavity cannot meet the filtering of high frequency harmonics. The output ripple is large, the output harmonic component is large, the effect is not single, the load network is poor, and the output effect is poor. 2) It cannot realize soft switching, and cannot realize zero voltage turn-on or zero current turn-off, so the loss on the switch tube is unacceptable when working at high power for a long time. 3) The circuit structure is relatively complex. In order to realize impedance matching, a variable inductance is added to the output side, the control precision is poor, the stability is not high, and the control is complex. 4) In order to realize high-power radio frequency output, the inductance design is difficult. Some inventions use air core coils, but the electromagnetic radiation of air core coils is large, which will affect other devices around when used.

[0005] Chinese patent CN 118178871 A discloses a radio frequency beauty instrument and a monopolar radio frequency electrode head. The monopolar radio frequency electrode head includes a shell, an electrode piece, and an insulating medium layer. Because the surface edge of the treatment part is arc-shaped, that is, an arc-shaped electrode piece is used, compared with a traditional square-shaped electrode head, the circular-shaped or elliptical-shaped treatment part has no sharp angle, so the current aggregation phenomenon at the edge can be reduced, the current distribution is optimized, the electric field distribution is more uniform, and the risk of burns during use of the radio frequency beauty instrument is reduced. In addition, because the medium layer is arranged on the surface of the treatment part facing the first opening, the metal surface of the treatment part does not directly contact the human body surface, but contacts the human body surface through the medium layer, the radio frequency energy is coupled into the skin through the equivalent capacitance between the metal electrode and the human skin, so that the discomfort during use can be reduced. The patent reduces the current aggregation phenomenon at the edge by using an arc-shaped electrode piece, thereby optimizing the current distribution, making the electric field distribution more uniform, and reducing the risk of burns during use of the radio frequency beauty instrument. However, this method has the following problems: 1) The arc-shaped electrode piece only solves the problem that the electrode has no sharp angle, and cannot solve the problem of inconsistent current density between the periphery of the electrode and the center of the electrode caused by skin effect. 2) Compared with a square-shaped electrode piece, the arc-shaped electrode piece has a smaller effective area, so the electrode size (and the handle size) may need to be increased or the action time may need to be increased to achieve the same effect. SUMMARY

[0006] In view of the above analysis, the utility model aims to provide a treatment device for a radio frequency beauty instrument and a radio frequency beauty instrument using the treatment device, to solve the problem that the device can realize high frequency, large power and high efficiency radio frequency output under a wide range of loads, and reduce the thermal damage to skin tissue during output.

[0007] The utility model provides a kind of treatment equipment for radio frequency beauty instrument, the treatment equipment includes detachable cold gas tank, control module, touch screen, radio frequency power amplifier circuit, automatic step-up / down power supply module, power supply module and adapter, the cold gas tank is communicated with the adapter by pipeline, the control module is electrically connected with the touch screen and the automatic step-up / down power supply module, the input of the radio frequency power amplifier circuit is connected with the output of the automatic step-up / down power supply module, the output of the radio frequency power amplifier circuit is connected with adapter, the radio frequency power amplifier circuit is symmetrical series-parallel resonant circuit, the symmetrical series-parallel resonant circuit includes high-frequency isolation transformer, third inductance, capacitor and parallel resonant circuit, the input of the parallel resonant circuit is connected with the output of the automatic step-up / down power supply module, the parallel resonant circuit is composed of first circuit and second circuit by parallel arrangement, the first circuit and second circuit include general capacitor, resonant capacitor, switch tube and inductance, and the capacitor, general capacitor, resonant capacitor, switch tube and third inductance constitute the resonant cavity of whole circuit topology.

[0008] Further improvement based on the above scheme, the first circuit includes first resonant capacitor, first switch tube, second inductance and first general capacitor, the second circuit includes second resonant capacitor, second switch tube, fourth inductance and second general capacitor, the first switch tube and second switch tube are alternately turned on, and in the process that the first switch tube and second switch tube are alternately turned on, the composition of resonant cavity is switched between the third inductance, the capacitor, the first resonant capacitor and the third inductance, the capacitor, the second resonant capacitor.

[0009] Further improvement based on the above scheme, the high-frequency isolation transformer includes magnetic core and winding, the magnetic core and winding are both plane inductance, and the plane inductance is fixed by different circuit boards with fixed gap multilayer stacking.

[0010] Further improvement based on the above scheme, a dc blocking capacitor is arranged in the high-frequency isolation transformer.

[0011] In another aspect, the utility model provides a kind of radio frequency beauty instrument, comprising: treatment equipment, treatment handle, back electrode plate, treatment probe and switch, the treatment equipment includes detachable cold gas tank, control module, touch screen, radio frequency power amplifier circuit, automatic step-up and step-down power supply module, power module and adapter, the treatment equipment is connected with the proximal end of the treatment handle by adapter, the switch is electrically connected with the control module in the treatment equipment, the treatment probe is installed in the distal end of the treatment handle, the treatment handle includes handle shell and handle cable, the handle cable is composed of circuit wire bundle and cold gas pipeline, one end of the cold gas pipeline is communicated with the cold gas tank in treatment equipment by adapter, the other end of the cold gas pipeline is communicated with the cold air port arranged in the treatment probe, one end of the circuit wire bundle is electrically connected with the output end of the control module and radio frequency power amplifier circuit by adapter, the other end of the circuit wire bundle is connected with the treatment electrode arranged on the treatment probe, the radio frequency power amplifier circuit is symmetrical series-parallel resonant circuit, the symmetrical series-parallel resonant circuit includes high-frequency isolation transformer, third inductance and capacitor and parallel resonant circuit, the input end of the parallel resonant circuit is connected with the output end of the automatic step-up and step-down power supply module, the parallel resonant circuit is composed of first circuit and second circuit arranged in parallel, the first circuit and second circuit all include general capacitor, resonance capacitor, switch tube and inductance, and the capacitor, general capacitor, resonance capacitor, switch tube and third inductance constitute the resonant cavity of entire circuit topology.

[0012] Based on the further improvement of the above scheme, the cold gas tank is communicated with the adapter by pipeline, the control module is electrically connected with the touch screen and the automatic step-up and step-down power supply module, the power module is connected with power interface, for power supply to touch screen, control module and automatic step-up and step-down power supply module, the input end of the radio frequency power amplifier circuit is connected with the output end of the automatic step-up and step-down power supply module, the output end of the radio frequency power amplifier circuit is connected with adapter, the first circuit includes first resonance capacitor, first switch tube, second inductance and first general capacitor, the second circuit includes second resonance capacitor, second switch tube, fourth inductance and second general capacitor, the first switch tube and second switch tube are alternately conducted, and in the process that the first switch tube and second switch tube are alternately conducted, the composition of resonant cavity is switched between the third inductance, the capacitor, the first resonance capacitor and the third inductance, the capacitor, the second resonance capacitor.

[0013] Based on the further improvement of the above scheme, the high-frequency isolation transformer is provided with direct-current blocking capacitor.

[0014] Based on the further improvement of the above scheme, the switch is foot switch directly connected with the control module of the treatment equipment.

[0015] Based on the further improvement of the above scheme, the switch is a trigger button arranged on the handle shell, the treatment handle further comprises a parameter setting part arranged on the handle shell and a control circuit board arranged in the handle shell, the trigger button and the parameter setting part are electrically connected with the control circuit board, and the control circuit board is electrically connected with the control module through the circuit wire harness.

[0016] Based on the further improvement of the above scheme, the parameter setting part comprises a radio frequency energy increasing button, a radio frequency energy decreasing button, a vibration adjusting button and a parameter confirming button.

[0017] Based on the further improvement of the above scheme, the temperature sensor and the pressure sensor are arranged in the treatment probe and connected with the control circuit board.

[0018] Based on the further improvement of the above scheme, the treatment probe is elastically connected with the handle shell.

[0019] Based on the further improvement of the above scheme, the treatment probe is arranged with an insulating object.

[0020] Based on the further improvement of the above scheme, a metal ring is arranged around the treatment electrode.

[0021] The beneficial effects of the above technical scheme are as follows:

[0022] Compared with the prior art, the utility model can realize at least one of the following beneficial effects:

[0023] 1. The utility model discloses a novel radio frequency power amplifier circuit, which is based on a symmetrical series-parallel resonant circuit, realizes multiple resonant cavities, and through the series-parallel combination of inductance and capacitance, can convert a load resistance into a smaller characteristic impedance, so that radio frequency energy can be outputted in a high frequency and large power in a larger load impedance range.

[0024] 2. The radio frequency power amplifier circuit of the utility model is in series with inductance on an output load.

[0025] 3. The radio frequency power amplification circuit of the utility model adds high frequency isolation transformer between radio frequency output and load, the magnetic core of high frequency isolation transformer uses planar inductor, different circuit boards are used for stacking on the planar inductor respectively and multi-layer stacking design is carried out with specific thickness air gap, the expected high frequency isolation can be obtained through the gap, and the multi-layer stacking realized through the circuit board also has higher turns ratio precision, which can not only ensure that the withstand voltage of high frequency isolation transformer meets the requirements, but also ensure that the value of leakage inductance is in the appropriate interval, the design can electrically isolate high frequency high power radio frequency energy of more than 5M, thereby improving the safety of the application end.

[0026] 4. The utility model discloses a treatment probe is provided with insulating object, and adds metal ring around the treatment electrode. Because of the existence of insulating object, radio frequency source will not produce actual radio frequency current flow between treatment electrode and back electrode, but the radio frequency electric field produced will make the ion in the tissue move at high speed and heat up through friction. The function of metal ring is to form an equipotential area around the contact part of treatment electrode and insulating object and tissue, and the existence of this area can offset the skin effect, so that the electrode current density distribution is uniform, thereby reducing the occurrence probability of local thermal damage.

[0027] 5. The temperature sensor and cold air outlet of the utility model are distributed in high density array, which facilitates the radio frequency beauty instrument to detect the temperature of each area of treatment electrode in real time during work, and accordingly adjust the air flow size of each cold air outlet in real time, so as to ensure that the temperature of the skin acting part is consistent, thereby further reducing the occurrence probability of thermal damage.

[0028] In the utility model, the above technical solutions can be combined with each other to realize more preferred combination solutions. Other features and advantages of the utility model will be described in the subsequent specification, and some advantages can become apparent from the specification or be understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained through the contents specifically pointed out in the specification and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0029] The drawings are only used for the purpose of showing specific embodiments and are not considered as limiting the utility model, and the same reference signs represent the same parts throughout the drawings.

[0030] Figure 1A It is the structure schematic diagram of the treatment equipment of radio frequency beauty instrument.

[0031] Figure 1B It is the structure connection schematic diagram of the treatment equipment of radio frequency beauty instrument.

[0032] Figure 1C It is the whole structure schematic diagram of radio frequency beauty instrument.

[0033] Figure 2A Front view of the treatment handle.

[0034] Figure 2B Back view of the treatment handle.

[0035] Figure 3 Internal view of the treatment handle.

[0036] Figure 4 A schematic diagram of one embodiment of a symmetrical RF power amplifier circuit.

[0037] Figure 5 A schematic diagram of a high frequency isolation transformer.

[0038] Figure 6 A schematic diagram of the electric field distribution when RF energy interacts with tissue.

[0039] Figure 7A A schematic diagram of the electric field distribution on a normal electrode surface.

[0040] Figure 7B A schematic diagram of the electric field distribution on an electrode surface with a metal ring added.

[0041] Figure 8 A schematic diagram of the internal structure of the treatment electrode.

[0042] Figure 9 A system control flowchart of the RF beauty instrument.

[0043] Figure 10 A schematic diagram of the output negative feedback control principle of the RF beauty instrument. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and examples.

[0045] The "proximal end" of the present application refers to the end close to the operator, and the "distal end" of the present application refers to the end away from the operator.

[0046] As Figure 1A and Figure 1BAs shown, a treatment device 1 for a radio frequency cosmetic instrument, the treatment device 1 comprising a detachable cold gas tank 13, a control module 14, a touch screen 12, a radio frequency power amplifier circuit 15, an automatic step-up / down power supply module 16, a power supply module 17 and a switching interface 11, the cold gas tank 13 being in communication with the switching interface 11 through a pipeline, the control module 14 being electrically connected with the touch screen 12, the cold gas tank 13 and the automatic step-up / down power supply module 16, an input end of the radio frequency power amplifier circuit 15 being connected with an output end of the automatic step-up / down power supply module 16, an output end of the radio frequency power amplifier circuit 15 being connected with the switching interface 11, the power supply module 17 being connected with a power supply interface 18 for supplying power to the touch screen 12, the control module 14 and the automatic step-up / down power supply module 16. The control module 14 controls the amount of cold gas delivered by the cold gas tank 13 to the switching interface 11. As shown, Figure 4 As shown, the radio frequency power amplifier circuit 15 is a symmetrical series-parallel resonant circuit, the symmetrical series-parallel resonant circuit comprising a high-frequency isolation transformer 151, a third inductor L3, a capacitor C4 and a parallel resonant circuit 152, an input end of the parallel resonant circuit 152 being connected with an output end of the automatic step-up / down power supply module 16, the parallel resonant circuit 152 being composed of a first circuit 1521 and a second circuit 1522 arranged in parallel, the first circuit 1521 and the second circuit 1522 each comprising a general capacitor, a resonant capacitor, a switch tube and an inductor, the capacitor, the general capacitor, the resonant capacitor, the switch tube and the third inductor constituting a resonant cavity of the entire circuit topology. As shown, Figure 4 As shown, the first circuit 1521 comprises a first resonant capacitor C5, a first switch tube Q1, a second inductor L2 and a first general capacitor C7, and the second circuit 1522 comprises a second resonant capacitor C6, a second switch tube Q3, a fourth inductor L4 and a second general capacitor C9.

[0047] The network power supply (220V AC mains) is converted into a DC power supply through a medical switching power supply, and the DC power supply is converted into an adjustable power supply HV through an automatic voltage boosting and reducing power supply module 16. Since the working frequency of the radio frequency beauty instrument is relatively high (usually higher than 5MHz), there are certain requirements for the transient output current capacity of the adjustable power supply HV, so the first general capacitor C7 and the second general capacitor C9 are needed to supply transient current, and the first inductor L2 and the second inductor L4 are used as choke coils to reduce current ripple. Therefore, the first general capacitor C7 and the second inductor L2, the second general capacitor C9 and the fourth inductor L4 ensure that the HVDC can provide smooth current for the radio frequency power amplification circuit 15 to form an input current source. The first switch tube Q1, the second switch tube Q3, the third inductor L3, and the capacitor C4, the first resonant capacitor C5, and the second resonant capacitor C6 constitute the main resonant cavity of the entire circuit topology, and the first resonant capacitor C5 and the second resonant capacitor C6 are kept symmetrical. The high-frequency isolation transformer 151 is provided with a DC blocking capacitor C3 inside, which is used to filter out the small DC component on the output side in actual application. The high-frequency isolation transformer 151 is used to isolate the radio frequency output from the application part. The first switch tube Q1 and the second switch tube Q3 are alternately turned on, that is, the driving signals G_N and G_P are square waves with a phase difference of 180°, and the frequency of the square wave determines the frequency of the radio frequency output signal. In the process of alternating conduction of the first switch tube Q1 and the second switch tube Q3, the composition of the resonant cavity is switched between the third inductor L3, the capacitor C4, the first resonant capacitor C5, and the third inductor L3, the capacitor C4, and the second resonant capacitor C6. The capacitors, general capacitors, resonant capacitors, inductors, and switch tubes in the present application are all general components of the radio frequency power amplification circuit in the prior art, and there are no special requirements for their parameters.

[0048] The radio frequency power amplification circuit in the prior art generally adopts a series resonance mode, such as the circuit disclosed in Figure 2 of Chinese patent CN 118121830A. In a series resonance circuit, the sum of the reactance of L and C is zero, which behaves as a short circuit, and forms an ideal frequency constant voltage source with the power supply, and the output end obtains an output peak constant oscillation voltage. The series resonance performs well under a small impedance load, but the larger the load impedance, the smaller the quality factor of the circuit, resulting in large overall loss of the circuit, thereby reducing the efficiency of the circuit. The human body impedance range is large, so the output effect of the series resonance circuit under a large impedance range is not ideal.

[0049] The radio frequency power amplification circuit 15 is a series-parallel resonant circuit, an input current source charges the first resonant capacitor C5 to form a voltage source, the voltage source and the third inductor L3 can be transformed into an equivalent current source and an equivalent inductor, the equivalent inductor and the capacitor C4 form parallel resonance, and the equivalent current source provides the peak constant oscillation current for the load (for example, the treatment end connected with the switching interface 11) through the parallel resonance. Since the connection mode of the first resonant capacitor C5 and the third inductor L3 in the circuit is series, a series-parallel resonant circuit is formed in essence. The novel symmetrical radio frequency power amplification circuit 15 is based on the series-parallel resonant circuit, and through series-parallel combination of the inductor and the capacitor, the load resistance can be converted into smaller characteristic impedance, so that high-efficiency output in a larger load range is realized. The above description is under the condition that the first switch tube Q1 is cut off and the second switch tube Q3 is turned on; when the second switch tube Q3 is cut off and the first switch tube Q1 is turned on, the above description is also applicable to the resonant circuit formed by the second resonant capacitor C6, the third inductor L3 and the capacitor C4.

[0050] If the treatment end (for example, a treatment probe) does not directly contact the skin tissue, the radio frequency energy acts on the skin through capacitive coupling. Therefore, there is a parasitic capacitor in the load, which is generated by the contact between the insulating medium on the surface of the treatment probe and the skin, has large capacitance, and is in series connection with the load, so that most of the output energy is diverted. The utility model adds the inductor L1 to compensate for the parasitic capacitor generated at the output end, so as to improve the actual power obtained on the load. Specifically, as shown in the figure, Figure 4 The utility model adds the first inductor L1 on the high-frequency isolation transformer 151, compensates for the parasitic capacitor through the additional first inductor L1, that is, the capacitance of the parasitic capacitor is offset by the inductance of the first inductor L1. After compensation, only small inductance and the load are left at the output end of the high-frequency isolation transformer 151, and most of the output energy can act on the load (that is, the treatment end), so as to improve the actual power obtained on the load.

[0051] In addition, the novel symmetrical radio frequency power amplification circuit 15 is push-pull output, and the left and right circuits only work for half of the time in a switching cycle, so that the energy output by the radio frequency power amplifier is supplied by two constant current sources formed by the HV, the first general capacitor C7 and the second inductor L2, and the HV, the second general capacitor C9 and the fourth inductor L4, so that the current stress on the switch tube is reduced to half of the original. And its output is only half cycle, the output range is reduced from the original peak-peak value to the peak value, and the voltage is reduced to half of the original. Under the condition of the same voltage stress, the single-side output amplitude can be higher, and the power is the square function of the voltage, so that the output power can be increased to four times of the original, so that higher output power is realized.

[0052] In high-frequency circuits, the overlap of voltage and current occurs in the process of turning on and off of the switch tube, which causes the switch tube to generate turn-on loss and turn-off loss in the process of turning on and off. With the increase of switching frequency, the proportion of switching loss generated in the switching process gradually increases, which will greatly reduce the working efficiency of the circuit. Figure 4 As shown in the utility model discloses a novel symmetrical radio frequency power amplifier circuit, the current i C (t) is:

[0053]

[0054] Wherein, i1 is the current provided by the input current source, i L (t) is the current flowing through the resonant inductor L3. The voltage v c (t) is the integral of the current flowing thereto, that is:

[0055]

[0056] The novel symmetrical radio frequency power amplifier circuit is zero-voltage turned on and zero-current turned off, and the following boundary conditions are obtained:

[0057]

[0058] Substituting formula (1.3) into formula (1.1) and formula (1.2), the following formula is obtained:

[0059]

[0060] Based on the above analysis, the amplitude-frequency and phase-frequency relationship between the resonant inductor current i L (t) and the equivalent current source i1 can be obtained as follows:

[0061]

[0062] Wherein, the characteristic impedance Z0, the quality factor Q L , the first resonant angular frequency ω0 and the second resonant angular frequency ω1 are as follows:

[0063]

[0064] Finally, Figure 4 As shown in the utility model discloses a novel symmetrical radio frequency power amplifier circuit, the current i

[0065]

[0066] Based on the analysis of formula (1.1) to formula (1.8), the novel symmetrical radio frequency power amplification circuit can realize high-frequency soft opening of the switch tube, and specifically, based on the symmetrical series-parallel resonant circuit shown in the figure, by introducing the second inductance L2 and the fourth inductance L4 and the first resonant capacitor C5 and the second resonant capacitor C6, the voltage across the switch tube can be zero when the switch tube is turned on, and the current flowing through the switch tube is zero (i.e. zero voltage opening and zero current closing) when the switch tube is turned off, thereby greatly reducing the switching loss and improving the working efficiency of the circuit. Figure 4

[0067] Generally, the radio frequency power amplification circuit is a single-ended circuit topology, and the output contains not only odd harmonics but also even harmonics. The novel symmetrical radio frequency power amplification circuit has push-pull output, and the even harmonic component of the output under push-pull driving can be ignored, and the output waveform satisfies the odd harmonic function, and the corresponding Fourier series expansion is as follows:

[0068]

[0069] The calculation of a n It can be obtained that:

[0070]

[0071] For formula (1.10), when n is even, a n is equal to 0; when n is odd, a n is not equal to 0, and b n in formula (1.9) is the same as a n . Therefore, in the half-wave symmetrical function, only the fundamental component and the odd harmonic component are contained in the Fourier expansion, and the even harmonic component is not contained. Based on the push-pull output mode, the high-order harmonic component of the odd harmonic component in the output is reduced, and the even harmonic component can also be ignored, so that the quality of the output waveform is improved, thereby improving the working efficiency of the circuit.

[0072] For high-frequency (usually higher than 5MHz) application scenarios, it is difficult to isolate high-frequency energy on the output side. Traditional high-frequency isolation is mainly realized by air spacing. Due to improper selection and structure design of the transformer magnetic core, the transformer leakage inductance is large, which affects the resonant circuit, thereby causing the switch tube loss to increase sharply, or the parasitic parameters are large, which causes waveform distortion, etc. Figure 5 ​As shown, the high-frequency isolation transformer includes a magnetic core 143 and a winding 144, both of which are planar inductors fixed by different circuit boards with a fixed gap multi-layer stacking. The different circuit boards are a primary circuit board 141 and a secondary circuit board 142, which are designed in a multi-layer stacking with a specific thickness of air gap. The expected high-frequency isolation can be obtained through the gap, and the multi-layer stacking of the primary and secondary realized by the circuit boards also has higher turn ratio precision. The design can ensure that the withstand voltage between the primary and secondary of the high-frequency isolation transformer meets the requirements, and also ensure that the leakage inductance value is within a suitable range, thereby realizing the isolation of high-frequency energy. The design can electrically isolate high-frequency high-power radio frequency energy of 5M or more, thereby improving the safety of the application end.

[0073] As shown in Figure 1C , a radio frequency beauty instrument includes the treatment device 1, the treatment handle 2, the back plate 3, a switch, and the treatment probe 5 described above. As shown in Figure 1A , the treatment device 1 includes a detachable cold gas tank 11, a control module 14, a touch screen 12, a radio frequency power amplification circuit 15, an automatic step-up / down power supply module 16, a power supply module 17, and an adapter 11. The specific structure of the treatment device 1 is as described above. The treatment device 1 is connected to the proximal end of the treatment handle 2 through the adapter 11. The switch is electrically connected to the control module 14 in the treatment device 1. The treatment probe 5 is installed at the distal end of the treatment handle 2. As shown in Figure 2A , the treatment handle 2 includes a handle shell 22 and a handle cable 23. As shown in Figure 3As shown, the handle cable 23 is composed of a circuit wire bundle 231 and a cold gas pipeline 232. One end of the cold gas pipeline 232 communicates with the cold gas tank 13 in the treatment device 1 through the adapter 11, and the other end of the cold gas pipeline 232 communicates with the cold gas port 53 arranged in the treatment probe 5. One end of the circuit wire bundle 231 is electrically connected with the output end of the control module 14 and the radio frequency power amplifier circuit 15 through the adapter 11, and the other end of the circuit wire bundle 231 is connected with the treatment electrode 51 arranged on the treatment probe 3. The treatment probe 5 acts on the surface of the human skin, and the back electrode plate 3 is in good contact with the back of the human body through the conductive paste. The radio frequency energy generated by the treatment device 1 acts on the treatment probe 5 at the head end of the treatment handle 2 on one end, and acts on the back electrode plate 3 on the other end, thereby forming a radio frequency current loop. Generally, the back electrode plate 3 is attached to the back of the human body, and the back electrode plate 3 has a large contact area with the back of the human body. In addition, a layer of conductive gel is usually coated between the back electrode plate 3 and the back of the human body. The above manner makes the contact impedance between the back electrode plate 3 and the back of the human body low and the current density low, so that most of the radio frequency energy is concentrated at the head end of the treatment electrode 5. The radio frequency energy interacts with the skin tissue, so as to heat the tissue and promote protein regeneration and fat dissolution, thereby achieving the effect of radio frequency beauty. The cold gas in the cold gas tank 13 and the radio frequency energy generated by the treatment device 1 act on the head end of the treatment probe 5 through the adapter 11. The cold gas includes but is not limited to CO2, N20, freon, liquid nitrogen or argon, etc. During the treatment process, if the treatment device 1 detects that the temperature of the skin tissue is too high, the cold gas flow can be increased to neutralize the additional heat generated at the head end of the treatment probe 5 which is not used for treatment, so as to reduce the thermal damage to the skin. In an embodiment, the switch is a foot switch 4 directly connected with the control module of the treatment device 1. When the foot switch 4 is stepped on, the radio frequency energy of the treatment device 1 and the cold gas in the cold gas tank 13 can act on the head end of the treatment probe 5. The touch screen 12 in the treatment device 1 is used for parameter setting before treatment, such as selection of treatment gear and vibration gear, etc. The touch screen 12 can also display parameter information in real time during the treatment process, such as output energy and treatment times, etc. In addition, the touch screen 12 can also prompt the user to perform corresponding operations in different treatment stages, and display the abnormal state of the current device, etc.

[0074] In an embodiment, the switch is an activation button 24 arranged on the handle shell 22, as shown in FIG. 1. Figure 2A and Figure 3As shown, the treatment handle 2 comprises a handle shell 22, a handle cable 23, a trigger button 24, parameter setting components 25 arranged on the handle shell, and a control circuit board 223 arranged in the handle shell 22, the trigger button 24 and the parameter setting components 25 are electrically connected with the control circuit board 223, and the control circuit board 223 is electrically connected with the control module 14 in the treatment device 1 through the circuit wire bundle 231. The treatment probe 5 can be inserted into and fixed with the distal end of the treatment handle 2. The trigger button 24 is arranged on the front face of the treatment handle 2, and the trigger button 24 is similar in function to the foot switch 4, when the trigger button 24 is pressed, the radio frequency energy of the treatment device 1 and the cold gas in the cold gas tank 13 can act on the head end of the treatment probe 5. As shown Figure 2B As shown, the parameter setting components 25 are arranged on the back face of the treatment handle 2, and the parameter setting components 25 comprise a radio frequency energy increase button 251, a radio frequency energy decrease button 252, a vibration adjustment button 253, and a parameter confirmation button 254. When setting the parameters, the corresponding button on the parameter setting components 25 needs to be pressed first, and finally the parameter confirmation button 254 is pressed, and then the parameter setting can take effect; if the parameter confirmation button 254 is not pressed, the system remains the previous parameters.

[0075] Figure 3The internal structure of the treatment handle. The handle cable 23 includes a circuit wire bundle 231 and a cold gas pipeline 232. The radio frequency energy generated by the treatment device 1 is transmitted to the treatment electrode 51 through the circuit wire bundle 231, so as to perform radio frequency heating on the skin tissue. The cold gas in the cold gas tank 13 is connected to the electromagnetic valve 221 through the cold gas pipeline 232. During the treatment process, the electromagnetic valve 221 is in a normally open state, and if the treatment device 1 detects that the temperature at the skin tissue is too high, the additional non-treatment heat generated by the head end of the treatment probe 5 can be neutralized by increasing the cold gas flow and acting on the treatment electrode 51 through the cold gas port 53, so as to cool the skin tissue and control the thermal damage. The treatment handle 2 is internally integrated with a control circuit board 223, and is fixed with the handle shell 22 through a circuit board fixing member 224. The temperature sensor 52 is installed in the treatment probe 5, which can monitor the temperature change of the treatment electrode 51 in real time during the treatment process. The control circuit board 223 processes the temperature information and transmits it to the control circuit 14 in the treatment device 1 through the circuit wire bundle 231, so as to adjust the radio frequency energy and the cold gas flow. Specifically, the parameter setting member 25 and the touch screen 12 on the treatment handle 2 are used for initial parameter setting before treatment. During the treatment process, the treatment device 1 adjusts the current radio frequency energy and cold gas flow in real time according to the temperature change of the treatment electrode 51, so as to reduce the additional non-treatment heat generated by the head end of the treatment probe 5 as much as possible, thereby controlling the thermal damage. The pressure sensor 222 is also installed in the treatment probe 5. The treatment probe 5 and the handle shell 22 are elastically connected, and the motor 55 is provided in the treatment probe 5. The motor 55 is fixedly connected with the shell of the treatment probe 5, and the power supply line and the control signal line of the motor 55 are connected with the control circuit board 223. During the treatment process, the control circuit board 223 continuously controls the motor 55 to vibrate, so as to drive the treatment probe 5 to continuously vibrate to reduce the possible neuromuscular stimulation during the treatment process. The force of the treatment probe 5 can be detected by the pressure sensor 222 in real time, and fed back to the control circuit board 223 and the control circuit in the treatment device 1 through the circuit wire bundle 231. The temperature sensor 52 is distributed in a high-density array, and the cold gas ports 53 are also distributed in a high-density array. The radio frequency beauty instrument can detect the temperature of the region acted on by the treatment electrode 51 in real time during the work process, and accordingly adjust the air flow of each cold gas port 53 in real time, so as to ensure that the temperature of the skin acting part is consistent, thereby further reducing the probability of thermal damage.

[0076] Figure 8 The internal structure of the treatment electrode 51. The treatment electrode 51 is located on the surface of the flexible circuit board 56, and the flexible circuit board 56 can be well connected with the skin tissue through the insulating material 261. In an embodiment, an insulating material is provided on the treatment probe 5. As shown in FIG. 6, the treatment electrode 51 is provided with a plurality of cold gas ports 53, and the cold gas ports 53 are arranged in a high-density array. The cold gas ports 53 are connected with the cold gas pipeline 232 through the circuit wire bundle 231. Figure 6As shown, due to the presence of the insulating object 261, the radio frequency source 111 output by the treatment device 1 does not generate actual radio frequency current flow between the treatment electrode 51 and the back electrode plate 3, but the generated radio frequency electric field causes the ions in the tissue to move at high speed and heat up through friction. The flexible circuit board can be more attached to the skin tissue during treatment to achieve a more complete treatment effect. The treatment probe 5 of the utility model is capacitively coupled with the skin tissue 61, the radio frequency energy does not directly contact the human skin, and there is an insulating object 261 (including but not limited to polyimide) between the treatment probe 5 and the skin tissue 61 of the human body. The energy is propagated in the form of a field, the radio frequency penetrates the skin to the subcutaneous tissue, the high-frequency vibration and the resistance heat cause the subcutaneous tissue to heat, and then promote the regeneration of collagen.

[0077] When a common electrode is used, the electric field distribution on the surface of the common electrode is as shown in Figure 7A When the ions in the tissue move at high speed under the action of the radio frequency electric field, the movement and heating effect under different electric field intensities are different. Generally, at the edge 511, especially at the position with relatively sharp angle, the electric field is stronger, the ion movement speed is faster, the heating effect is more obvious, and it is also easy to cause the undesired thermal damage. The utility model sets a metal ring 54 around the treatment electrode 51, and the electric field distribution of the treatment electrode 51 is as shown in Figure 7B The metal ring 54 and the treatment electrode 51 are connected through a fixing structure. The metal ring 54 directly contacts the tissue, but is not electrically connected with the treatment electrode 51. Its role is to form an equipotential region around the treatment electrode 51 and the contact part of the insulating object 261 with the tissue. The existence of this region causes the ions in the nearby substances to be in a uniform radio frequency electric field, thereby forming uniform high-speed movement and generating uniform heat effect. In this way, local overheating can be avoided, and the uniform heat effect is also more controllable.

[0078] The head end of the treatment probe 5 of the utility model can be square, a metal ring 54 is added around the action area of the treatment electrode 51, the metal ring 54 has no electrical property, and the distance between the metal ring 54 and the action area is preferably 1 mm. The metal ring 54 is located on the inner side of the treatment probe 5, and the metal ring 54 can be realized through the windowing of the copper foil on the flexible circuit board 56 or through the additional welding of a metal ring on the flexible circuit board. The back surface of the flexible circuit board is not treated. The metal ring 54 affects the action area through induced electricity, so that the action area is equipotential. The formation of equipotential makes the current more uniform when the radio frequency acts, reduces the thermal damage at the edge, and at the same time maintains the high-efficiency probe action area.

[0079] Figure 9 It is a control flow chart of the radio frequency beauty instrument. The control method of the radio frequency beauty instrument of the utility model comprises the following steps:

[0080] First step: turn on the radio frequency beauty instrument through the foot switch or the trigger button;

[0081] Second step: set the output parameters through the touch screen or the parameter setting component;

[0082] Third step: measure the detection pressure and the detection temperature through the pressure sensor and the temperature sensor, compare them with the threshold pressure and the threshold temperature respectively through the control circuit board, when the detection pressure is less than the threshold pressure and / or the detection temperature is greater than the threshold temperature, do not perform the radio frequency output; when the detection pressure is greater than the threshold pressure and the detection temperature is less than the threshold temperature, perform the energy output with the initially set parameters;

[0083] Fourth step: in the energy output process, real-time detect the load impedance, pressure and temperature data, and judge whether the data is within the normal range, once abnormal, stop the energy output;

[0084] Fifth step: in the energy output process, adjust the radio frequency output power and the cold gas flow according to the changes of the load impedance, pressure and temperature data detected in the fourth step, adjust the output of the radio frequency beauty instrument in a negative feedback manner until the operation is completed.

[0085] That is, after the radio frequency beauty instrument is turned on, the user can set the output parameters through the touch screen 12 or the parameter setting component 25 on the back of the treatment handle 2, and then the system will detect whether the pressure and temperature at the treatment electrode 51 are normal. Specifically, if the detection pressure is less than the threshold pressure F0, it is considered that the treatment electrode 51 is not in good contact with the skin tissue, and at this time the radio frequency output cannot be performed until the detection pressure is greater than F0. If the detection temperature is greater than the threshold temperature T0, it is considered that the heat damage in the treatment process is too large, and at this time the radio frequency output cannot be performed until the detection temperature is less than T0. When the detection pressure is greater than F0 and the detection temperature is less than T0, the energy output is started with the initially set parameters. In the output process, the system will real-time detect the load impedance, pressure and temperature data, and judge whether the pressure and temperature are within the normal range, once abnormal, stop the energy output. In addition, the system will also adjust the radio frequency power output and the cold gas flow in real time according to the changes of the load impedance, pressure and temperature data, so as to realize the treatment purpose while reducing the contact temperature between the skin tissue and the treatment electrode 51, thereby reducing the tissue heat damage.

[0086] Figure 10 The output negative feedback control principle diagram of the radio frequency beauty instrument. In the output process, Figure 9In the setting output parameter stage, the operator can set the initial radio frequency output power and the cold gas flow rate, and in the radio frequency output process, the system can detect the impedance, pressure and temperature parameters at the treatment electrode 51 in real time, and according to the change of the parameters, determine the increment of the current radio frequency output power and the cold gas flow rate, so as to adjust the output of the radio frequency beauty instrument in a negative feedback manner. Specifically, if the impedance detection value increases, the radio frequency output power is increased, otherwise, the radio frequency output power is reduced; if the pressure detection value increases, the radio frequency output power is reduced, otherwise, the radio frequency output power is increased; if the temperature detection value increases, the radio frequency output power is reduced and the cold gas flow rate is increased, otherwise, the radio frequency output power is increased and the cold gas flow rate is reduced. Based on the negative feedback adjustment mode of the radio frequency beauty instrument output, the heat damage of the skin tissue can be reduced on the basis of ensuring the effective treatment effect.

[0087] The above description of the present application is intended to enable a person skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application, and any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A treatment device for a radio frequency cosmetic instrument, characterized in that, The treatment device comprises a detachable cold gas tank, a control module, a touch screen, a radio frequency power amplifier circuit, an automatic step-up and step-down power supply module, a power supply module and a switching port, the cold gas tank is communicated with the switching port through a pipeline, the control module is electrically connected with the touch screen and the automatic step-up and step-down power supply module, the input end of the radio frequency power amplifier circuit is connected with the output end of the automatic step-up and step-down power supply module, the output end of the radio frequency power amplifier circuit is connected with the switching port, the radio frequency power amplifier circuit is a symmetrical series-parallel resonant circuit, the symmetrical series-parallel resonant circuit comprises a high-frequency isolation transformer, a third inductor, a capacitor and a parallel resonant circuit, the input end of the parallel resonant circuit is connected with the output end of the automatic step-up and step-down power supply module, the parallel resonant circuit is composed of a first circuit and a second circuit arranged in parallel, and the first circuit and the second circuit each comprise a general capacitor, a resonance capacitor, a switch tube and an inductor.

2. The treatment device for a radio frequency cosmetic instrument according to claim 1, characterized in that, The first circuit comprises a first resonance capacitor, a first switch tube, a second inductor and a first general capacitor, the second circuit comprises a second resonance capacitor, a second switch tube, a fourth inductor and a second general capacitor, the first switch tube and the second switch tube are alternately turned on, and the composition of the resonant cavity is switched between the third inductor, the capacitor, the first resonance capacitor and the third inductor, the capacitor and the second resonance capacitor in the process that the first switch tube and the second switch tube are alternately turned on.

3. The treatment device for a radio frequency cosmetic instrument according to claim 1, characterized in that, The high-frequency isolation transformer comprises a magnetic core and a winding, the magnetic core and the winding each adopt a planar inductor, and the planar inductor is fixed by different circuit boards with a fixed gap and is stacked in multiple layers.

4. The treatment device for a radio frequency cosmetic instrument according to claim 1, characterized in that, The high-frequency isolation transformer is provided with a direct-current blocking capacitor.

5. A radio frequency cosmetic instrument comprising: The therapeutic device, therapeutic handle, back plate, therapeutic probe and switch according to any one of claims 1 to 4, wherein the therapeutic device comprises a detachable cold gas tank, a control module, a touch screen, a radio frequency power amplifier circuit, an automatic step-up / step-down power supply module, a power supply module and an adapter, the therapeutic device is connected to the proximal end of the therapeutic handle through the adapter, the switch is electrically connected to the control module in the therapeutic device, the therapeutic probe is installed at the distal end of the therapeutic handle, the therapeutic handle comprises a handle shell and a handle cable, the handle cable is composed of a circuit wire bundle and a cold gas pipeline, one end of the cold gas pipeline is communicated with the cold gas tank in the therapeutic device through the adapter, the other end of the cold gas pipeline is communicated with a cold gas port arranged in the therapeutic probe, one end of the circuit wire bundle is electrically connected to the output end of the control module and the radio frequency power amplifier circuit through the adapter, the other end of the circuit wire bundle is connected to the therapeutic electrode arranged on the therapeutic probe, the radio frequency power amplifier circuit is a symmetrical series-parallel resonant circuit, the symmetrical series-parallel resonant circuit comprises a high-frequency isolation transformer, a third inductor and a capacitor and a parallel resonant circuit, the input end of the parallel resonant circuit is connected to the output end of the automatic step-up / step-down power supply module, the parallel resonant circuit is composed of a first circuit and a second circuit arranged in parallel, the first circuit and the second circuit each comprise a general capacitor, a resonant capacitor, a switch tube and an inductor, and the capacitor, the general capacitor, the resonant capacitor, the switch tube and the third inductor constitute a resonant cavity of the entire circuit topology.

6. The radio frequency cosmetic instrument of claim 5, wherein, The cold gas tank is communicated with the adapter through a pipeline, the control module is electrically connected to the touch screen and the automatic step-up / step-down power supply module, the input end of the radio frequency power amplifier circuit is connected to the output end of the automatic step-up / step-down power supply module, the output end of the radio frequency power amplifier circuit is connected to the adapter, the first circuit comprises a first resonant capacitor, a first switch tube, a second inductor and a first general capacitor, the second circuit comprises a second resonant capacitor, a second switch tube, a fourth inductor and a second general capacitor, the first switch tube and the second switch tube are alternately turned on, and the composition of the resonant cavity is switched between the third inductor, the capacitor, the first resonant capacitor and the third inductor, the capacitor and the second resonant capacitor in the process of the first switch tube and the second switch tube being alternately turned on.

7. The radio frequency cosmetic instrument of claim 6, wherein, The high-frequency isolation transformer is provided with a direct-current blocking capacitor.

8. The radio frequency cosmetic instrument of claim 5, wherein, The switch is an excitation button arranged on the handle shell or a foot switch directly connected to the control module of the therapeutic device, the therapeutic handle further comprises a parameter setting component arranged on the handle shell and a control circuit board arranged in the handle shell, the excitation button and the parameter setting component are electrically connected to the control circuit board, and the control circuit board is electrically connected to the control module through the circuit wire bundle.

9. The radio frequency cosmetic instrument of claim 5, wherein, An insulating object is arranged on the therapeutic probe.

10. The radio frequency cosmetic instrument of claim 5, wherein, A metal ring is arranged around the therapeutic electrode.

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