CN217957050U - Radio frequency signal output circuit and electronic equipment - Google Patents
Radio frequency signal output circuit and electronic equipment Download PDFInfo
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- CN217957050U CN217957050U CN202221995228.5U CN202221995228U CN217957050U CN 217957050 U CN217957050 U CN 217957050U CN 202221995228 U CN202221995228 U CN 202221995228U CN 217957050 U CN217957050 U CN 217957050U
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Abstract
A radio frequency signal output circuit and electronic equipment belong to the technical field of electronic circuits, a power supply voltage is connected in through a switch circuit, and the on-off is carried out according to a control signal, so that the power supply voltage is output as a first voltage when the power supply voltage is connected, and the power supply voltage is stopped to be output as the first voltage when the power supply voltage is disconnected; the waveform conversion circuit outputs a first amplified waveform when the first voltage is accessed, and outputs a second amplified waveform when the first voltage is not accessed; because the waveform conversion circuit outputs various waveforms according to the on-off of the first voltage, the various waveforms form various electric field distributions, and the various electric field distributions are applied to cell molecules to generate various periodic electric field time domain distributions, thereby enriching the functions of the product.
Description
Technical Field
The application belongs to the technical field of electronic circuits, and particularly relates to a radio frequency signal output circuit and electronic equipment.
Background
At present, the radio frequency signal output circuit can only emit a single periodic waveform, the electric field distribution formed by the waveform can only generate a single periodic electric field time domain distribution when being applied to cell molecules, and the function is single.
It is desirable to provide an rf signal output circuit capable of transforming waveforms.
SUMMERY OF THE UTILITY MODEL
An object of the present application is to provide a radio frequency signal output circuit and an electronic device, which are used to solve the problem that the related radio frequency signal output circuit cannot provide multiple radio frequency waveforms with the same frequency.
The embodiment of the application provides a radio frequency signal output circuit, including:
the switching circuit is configured to be connected with a power supply voltage, and is switched on and off according to a control signal so as to output the power supply voltage as a first voltage when the switching circuit is switched on and stop outputting the power supply voltage as the first voltage when the switching circuit is switched off;
and the waveform conversion circuit is connected with the switch circuit and is configured to output a first amplified waveform when the first voltage is accessed and output a second amplified waveform when the first voltage is not accessed.
In one embodiment, the waveform conversion circuit includes:
the modulation circuit is connected with the switch circuit and is configured to output a first positive waveform and a first negative waveform when the first voltage is accessed, and output a second positive waveform and a second negative waveform when the first voltage is not accessed;
a transformer connected to the modulation circuit and the switching circuit and configured to superimpose and amplify the first waveform of the positive electrode and the first waveform of the negative electrode to output the first amplified waveform, or superimpose and amplify the second waveform of the positive electrode and the second waveform of the negative electrode to output the second amplified waveform;
wherein the first waveform of the positive electrode and the first waveform of the negative electrode have a phase difference of 180 degrees, and the second waveform of the positive electrode and the second waveform of the negative electrode have a phase difference of 180 degrees.
In one embodiment, the first waveform and the first amplified waveform are square waves or approximately square waves, and the second waveform and the second amplified waveform are sine waves or approximately sine waves.
In one embodiment, the first end of the primary side of the transformer and a tap of the primary side of the transformer are connected to the first waveform output end of the positive electrode of the modulation circuit or the second waveform output end of the positive electrode of the modulation circuit so as to access the first waveform of the positive electrode or the second waveform of the positive electrode;
the second end of the primary side of the transformer and a tap of the primary side of the transformer are connected with the first waveform output end of the cathode of the modulation circuit or the second waveform output end of the cathode of the modulation circuit so as to be connected with the first waveform of the cathode or the second waveform of the cathode.
And the first end of the secondary side of the transformer and the second end of the secondary side of the transformer are jointly used as a first amplified waveform output end of the transformer and a second amplified waveform output end of the transformer so as to output the first amplified waveform or the second amplified waveform.
In one embodiment, the modulation circuit comprises an inductive component, a first capacitive component, a second capacitive component, a first switching component and a second switching component;
the first end of the inductive component, the first end of the first capacitive component and the first end of the second capacitive component are used as power supply voltage input ends of the modulation circuit so as to access the power supply voltage;
the second end of the inductive component is used as a first voltage input end of the modulation circuit to be connected with the first voltage;
the second end of the inductive component, the second end of the second capacitive component and the input end of the second switching component are used as the waveform output end of the anode of the modulation circuit together to output the first waveform of the anode or the second waveform of the anode;
the second end of the inductive component, the second end of the first capacitive component and the input end of the first switch component are used as the waveform output end of the cathode of the modulation circuit together so as to output the first waveform of the cathode or the second waveform of the cathode;
the output end of the first switch component and the output end of the second switch component are connected to a power ground in common;
the control end of the first switch component is used as a first PWM signal input end of the modulation circuit so as to access a first PWM signal;
the control end of the second switch component is used as a second PWM signal input end of the modulation circuit so as to access a second PWM signal;
wherein the first PWM signal and the second PWM signal are complementary.
In one embodiment, when the first voltage input end of the modulation circuit is connected with a first voltage, the first switch component is configured to be switched on and off according to the first PWM signal, so that the positive waveform output end of the modulation circuit outputs a positive first waveform; the second switch component is configured to be switched on and off according to the second PWM signal, so that the waveform output end of the negative pole of the modulation circuit outputs a first waveform of the negative pole.
In one embodiment, when the first voltage input terminal of the modulation circuit is not connected with the first voltage, the inductive component, the second capacitive component and the transformer together form a first resonant cavity, and the first switching component is configured to perform resonant modulation on the first resonant cavity according to the first PWM signal, so that the positive waveform output terminal of the modulation circuit outputs a positive second waveform; the inductive component, the first capacitive component and the transformer together form a second resonant cavity, and the second switching component is configured to perform resonant modulation on the second resonant cavity according to the second PWM signal, so that the waveform output end of the negative electrode of the modulation circuit outputs a second waveform of the negative electrode.
In one embodiment, the switch circuit comprises a first field effect transistor, a second field effect transistor, a first resistor and a second resistor;
the source electrode of the first field effect transistor and the first end of the second resistor are jointly used as a power supply voltage input end of the switch circuit to be connected with the power supply voltage;
the source electrode of the second field effect transistor and the first end of the first resistor are jointly used as a first voltage output end of the switch circuit and connected with the waveform conversion circuit to output the first voltage;
the drain electrode of the first field effect transistor is connected with the drain electrode of the second field effect transistor;
the grid electrode of the first field effect transistor, the grid electrode of the second field effect transistor, the second end of the second resistor and the second end of the first resistor are jointly used as the control signal input end of the switch circuit to be connected with the control signal.
In one embodiment, the method further comprises the following steps:
a DC blocking filter circuit connected to the waveform transformation circuit and configured to block and filter the first amplified waveform and the second amplified waveform.
The embodiment of the utility model provides a still provide an electronic equipment, electronic equipment includes foretell radio frequency signal output circuit.
Compared with the prior art, the embodiment of the utility model beneficial effect who exists is: because the waveform transformation circuit outputs various waveforms according to the on-off of the first voltage, the various waveforms form various electric field distributions, and the various electric field distributions are applied to cell molecules to generate various periodic electric field time domain distributions, thereby enriching the functions of the product.
Drawings
In order to more clearly illustrate the technical utility model in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an rf signal output circuit according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a waveform converting circuit in the rf signal output circuit according to an embodiment of the present application;
fig. 3 is a schematic diagram of another structure of a waveform converting circuit in the rf signal output circuit according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a modulation circuit in an rf signal output circuit according to an embodiment of the present application;
fig. 5 is another schematic structural diagram of an rf signal output circuit according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an rf signal output circuit according to an embodiment of the present application;
fig. 7 is a schematic diagram of a partial example circuit of an rf signal output circuit according to an embodiment of the present application.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Fig. 1 shows a schematic structural diagram of an rf signal output circuit provided in a preferred embodiment of the present application, and for convenience of description, only the relevant portions of the present embodiment are shown, which are detailed as follows:
the radio frequency signal output circuit includes a switch circuit 11 and a waveform conversion circuit 12.
A switching circuit 11 configured to switch in a supply voltage and to be turned on and off according to a control signal to output the supply voltage as a first voltage when turned on and to stop outputting the supply voltage as the first voltage when turned off;
and a waveform conversion circuit 12 connected to the switching circuit 11 and configured to output a first amplified waveform when the first voltage is applied and output a second amplified waveform when the first voltage is not applied.
As shown in fig. 2, the waveform conversion circuit 12 includes a modulation circuit 20 and a transformer T1.
A modulation circuit 20 connected to the switching circuit 11 and configured to output a positive first waveform and a negative first waveform when a first voltage is applied thereto and output a positive second waveform and a negative second waveform when the first voltage is not applied thereto;
a transformer T1 connected to the modulation circuit and the switching circuit 11, and configured to superimpose and amplify a positive first waveform and a negative first waveform to output a first amplified waveform, or superimpose and amplify a positive second waveform and a negative second waveform to output a second amplified waveform;
wherein the first waveform of the positive electrode and the first waveform of the negative electrode have a phase difference of 180 degrees, and the second waveform of the positive electrode and the second waveform of the negative electrode have a phase difference of 180 degrees.
The generated first waveform of the anode and the generated first waveform of the cathode are superposed and amplified through the modulation circuit 20 and the transformer T1, or the generated first waveform of the anode and the generated first waveform of the cathode are superposed and amplified, so that two different amplified waveforms are obtained, different electric field distributions are formed, different periodic electric field time domain distributions can be generated when the amplified waveforms are applied to cell molecules, and the functions of the product are enriched.
By way of example and not limitation, the first waveform and the first amplified waveform are square waves or approximately square waves and the second waveform and the second amplified waveform are sine waves or approximately sine waves.
It can be understood that when the radio frequency output circuit outputs the first amplified waveform (square wave), an electric field distribution with a fast change speed is formed, a time domain distribution of a periodic electric field applied to cell molecules also has a fast change speed, and skin impedance enables the cell molecules to generate strong resonance rotation to generate heat energy, so that stimulation of the dermis layer generates immediate collagen tightening and has a strong collagen regeneration stimulation effect. When the radio frequency output circuit outputs the second amplification waveform (sine wave), electric field distribution with slow change speed is formed, the time domain distribution of the periodic electric field applied to cell molecules also has slow change speed, and the skin impedance enables the cell molecules to generate weak resonance rotation to generate a small amount of heat energy, so that the stimulation of the dermis layer generates immediate collagen tightening and the collagen regeneration stimulation effect is weak.
It should be noted that, as shown in fig. 3, the first end of the primary side of the transformer T1 and the tap of the primary side of the transformer T1 are connected to the first waveform output end of the anode of the modulation circuit 20 or the second waveform output end of the anode of the modulation circuit 20, so as to access the first waveform of the anode or the second waveform of the anode; the second end of the primary side of the transformer T1 and a tap of the primary side of the transformer T1 are connected with the first waveform output end of the cathode of the modulation circuit 20 or the second waveform output end of the cathode of the modulation circuit 20 so as to access the first waveform of the cathode or the second waveform of the cathode; the first end of the secondary side of the transformer T1 and the second end of the secondary side of the transformer T1 are used together as a first amplified waveform output end of the transformer T1 and a second amplified waveform output end of the transformer T1 to output a first amplified waveform or a second amplified waveform.
Through the connection of the transformer T1, the superposition and amplification of the first waveform of the positive electrode and the first waveform of the negative electrode are realized, or the superposition and amplification of the second waveform of the positive electrode and the second waveform of the negative electrode are realized.
As shown in fig. 4, the modulation circuit 20 includes an inductive component 21, a first capacitive component 22, a second capacitive component 23, a first switching component 24 and a second switching component 25.
A first end of the inductive component 21, a first end of the first capacitive component 22, and a first end of the second capacitive component 23 are used as power supply voltage input ends of the modulation circuit 20 to access power supply voltage; the second end of the inductive component 21 is used as the first voltage input end of the modulation circuit 20 to connect the first voltage; the second end of the inductive component 21, the second end of the second capacitive component 23, and the input end of the second switching component 25 are used as the positive waveform output end of the modulation circuit 20 to output a positive first waveform or a positive second waveform; the second end of the inductive component 21, the second end of the first capacitive component 22, and the input end of the first switch component 24 are used as the negative waveform output end of the modulation circuit 20 to output the negative first waveform or the negative second waveform; the output end of the first switch component 24 and the output end of the second switch component 25 are connected to the power ground in common; a control end of the first switch component 24 is used as a first Pulse Width Modulation (PWM) signal input end of the Modulation circuit 20 to access a first PWM signal; the control end of the second switching component 25 is used as a second PWM signal input end of the modulation circuit 20 to access the second PWM signal;
wherein the first PWM signal and the second PWM signal are complementary.
In a specific implementation, the modulation circuit 20 further includes a current limiting component; the output terminal of the first switching element 24 and the output terminal of the second switching element 25 are commonly connected to a first terminal of a current limiting element, and a second terminal of the current limiting element is connected to a power ground.
When the first voltage input end of the modulation circuit 20 is connected to the first voltage, the first switch component 24 is configured to be switched on and off according to the first PWM signal, so that the positive waveform output end of the positive electrode of the modulation circuit 20 outputs the positive first waveform; the second switching component 25 is configured to be turned on and off according to the second PWM signal, so that the waveform output terminal of the negative pole of the modulation circuit 20 outputs the first waveform of the negative pole. At this time, the first capacitive element 22 is configured to filter out higher harmonics in the first waveform of the positive electrode; the second capacitive component 23 is configured to filter out higher harmonics in the first waveform of the negative pole.
When the first voltage input end of the modulation circuit 20 is not connected with the first voltage, the inductive component 21, the second capacitive component 23 and the transformer T1 together form a first resonant cavity, and the first switching component 24 is configured to perform resonant modulation on the first resonant cavity according to the first PWM signal, so that the positive waveform output end of the modulation circuit 20 outputs a positive second waveform; the inductive component 21, the first capacitive component 22 and the transformer T1 together form a second resonant cavity, and the second switching component 25 is configured to perform resonant modulation on the second resonant cavity according to the second PWM signal, so that the negative waveform output end of the negative electrode of the modulation circuit 20 outputs a negative second waveform. It should be noted that the switching circuit 11 itself has a parasitic capacitance, and plays a parameter adjustment role for resonance.
When the first voltage input terminal of the modulation circuit 20 is not connected to the first voltage, two resonant cavities are formed by the inductive component 21, the first capacitive component 22 and the second capacitive component 23, and are modulated according to two complementary PWM signals, so as to output a positive second waveform and a negative second waveform with a phase difference of 180 degrees; when the first voltage input end of the modulation circuit 20 is connected with a first voltage, the two switch assemblies conduct the first voltage to a power ground according to two complementary PWM signals, so as to output a positive first waveform and a negative first waveform with phases different by 180 degrees; a waveform transformation is achieved.
As shown in fig. 5, the rf signal output circuit further includes a power filter circuit 13.
The power filter circuit 13 is connected to the switching circuit 11 and the waveform conversion circuit 12, and is configured to filter the supply voltage.
The stability of the radio frequency signal output circuit is improved by filtering the power supply voltage.
As shown in fig. 6, the rf signal output circuit further includes a dc blocking filter circuit 14.
A dc blocking filter circuit 14, connected to the waveform conversion circuit 12, configured to block and filter the first amplified waveform and the second amplified waveform.
The first amplification waveform and the second amplification waveform are subjected to blocking and filtering, so that the output waveform does not contain direct-current components any more, and the accuracy of the output signal of the radio-frequency signal output circuit is improved.
Fig. 7 shows a partial example circuit structure of a radio frequency signal output circuit provided by an embodiment of the present invention, and for convenience of description, only the parts related to the embodiment of the present invention are shown, and detailed descriptions are as follows:
the switch circuit 11 includes a first field effect transistor Q1, a second field effect transistor Q2, a first resistor R1, and a second resistor R2.
The source electrode of the first field effect transistor Q1 and the first end of the second resistor R2 are used together as a supply voltage input end of the switch circuit 11 to access a supply voltage; the source of the second field effect transistor Q2 and the first end of the first resistor R1 are used together as the first voltage output end of the switch circuit 11, and are connected to the waveform conversion circuit 12 to output the first voltage; the drain electrode of the first field effect tube Q1 is connected with the drain electrode of the second field effect tube Q2; the gate of the first field effect transistor Q1, the gate of the second field effect transistor Q2, the second end of the second resistor R2, and the second end of the first resistor R2 are used as the control signal input end of the switch circuit 11, so as to access the control signal.
It should be noted that the first fet Q1 and the second fet Q2 may also be replaced by a relay, a transistor, an IGBT, and a diode. The first fet Q1 and the second fet Q2 may also be integrated into one device.
The inductive component 21 comprises a first inductance L1; the first terminal of the first inductor L1 serves as the first terminal of the inductive component 21, and the second terminal of the first inductor L1 serves as the second terminal of the inductive component 21.
The first capacitive element 22 comprises a third capacitor C3 and a third resistor R3; a first terminal of the third capacitor C3 is used as a first terminal of the first capacitive element 22, a first terminal of the third resistor R3 is used as a second terminal of the first capacitive element 22, and a second terminal of the third capacitor C3 is connected to a second terminal of the third resistor R3.
Alternatively, the first capacitive element 22 may comprise only the third capacitance C3, or the first capacitive element 22 may comprise a plurality of parallel-connected capacitor strings.
The second capacitive element 23 comprises a second capacitor C2 and a fourth resistor R4. A first terminal of the second capacitor C2 is used as a first terminal of the second capacitive element 23, a first terminal of the fourth resistor R4 is used as a second terminal of the second capacitive element 23, and a second terminal of the second capacitor C2 is connected to a second terminal of the fourth resistor R4.
Alternatively, the second capacitive element 23 may also comprise only the second capacitance C2, or the second capacitive element 23 may comprise a plurality of parallel-connected capacitance strings.
The first switch component 24 includes a third field effect transistor Q3, a drain of the third field effect transistor Q3 is used as an input terminal of the first switch component 24, a source of the third field effect transistor Q3 is used as an output terminal of the first switch component 24, and a gate of the third field effect transistor Q3 is used as a control terminal of the first switch component 24.
The second switching element 25 comprises a fourth field effect transistor Q4; the drain of the fourth fet Q4 serves as the input terminal of the second switching element 25, the source of the fourth fet Q4 serves as the output terminal of the second switching element 25, and the gate of the fourth fet Q4 serves as the control terminal of the second switching element 25.
The DC blocking filter circuit 14 comprises a fourth capacitor C4 and a fifth capacitor C5; the first end of the fourth capacitor C4 and the first end of the fifth capacitor C5 are used as a first amplified waveform input end of the dc blocking filter circuit 14 and a second amplified waveform input end of the dc blocking filter circuit 14, and are connected to the waveform converting circuit 12 to access the first amplified waveform and the second amplified waveform; a second end of the fourth capacitor C4 and a second end of the fifth capacitor C5 are used as a first amplified waveform input end of the dc blocking filter circuit 14 after dc blocking and filtering and a second amplified waveform input end of the dc blocking filter circuit 14 after dc blocking and filtering, and are connected to the waveform converting circuit 12 to access the first amplified waveform after dc blocking and filtering and the second amplified waveform after dc blocking and filtering.
The power supply filter circuit 13 includes a first capacitor C1.
The current limiting assembly 26 further includes a seventh resistor R7. A first terminal of the seventh resistor R7 serves as a first terminal of the current limiting component 26, and a second terminal of the seventh resistor R7 serves as a second terminal of the current limiting component 26.
The description of fig. 7 is further described below in conjunction with the working principle:
when the control signal is at a low level, the first field effect tube Q1 and the second field effect tube Q2 are switched on, so that the source electrode of the second field effect tube Q2 outputs a first voltage to a tap of the transformer T1, and the third field effect tube Q3 is switched on and off according to the first PWM signal, so that the waveform output end of the positive electrode of the modulation circuit 20 outputs a first waveform of the positive electrode to a first end of the primary side of the transformer T1 and a tap of the primary side of the transformer T1; the fourth field effect transistor Q4 is turned on and off according to the second PWM signal, so that the waveform output terminal of the negative electrode of the modulation circuit 20 outputs the first waveform of the negative electrode to the second end of the primary side of the transformer T1 and the tap of the primary side of the transformer T1. At the moment, the third capacitor C3 and the third resistor R3 filter out higher harmonics in the first waveform of the anode; the second capacitor C2 and the fourth resistor R4 filter out higher harmonics in the first waveform of the negative electrode. The transformer T1 superimposes and amplifies the first waveform of the positive electrode and the first waveform of the negative electrode to output a first amplified waveform from a first end of a secondary side of the transformer T1 and a second end of the secondary side of the transformer T1; the first amplified waveform is output after being subjected to blocking and filtering by a fourth capacitor C4 and a fifth capacitor C5. The first amplified waveform is a square wave.
When the control signal is at a high level, the first fet Q1 and the second fet Q2 are turned off, so that the source of the second fet Q2 stops outputting the first voltage to the tap of the transformer T1. At this time, the first inductor L1, the third capacitor C3, the third resistor R3 and the transformer T1 jointly form a first resonant cavity, and the third field-effect tube Q3 performs resonance modulation on the first resonant cavity according to the first PWM signal, so that the positive waveform output end of the modulation circuit 20 outputs a positive second waveform to the first end of the primary side of the transformer T1 and a tap of the primary side of the transformer T1; the first inductor L1, the second capacitor C2, the fourth resistor R4, and the transformer T1 together form a second resonant cavity, and the fourth field-effect transistor Q4 performs resonant modulation on the second resonant cavity according to the second PWM signal, so that the waveform output end of the negative electrode of the modulation circuit 20 outputs a second waveform of the negative electrode to the second end of the primary side of the transformer T1 and a tap of the primary side of the transformer T1. It should be noted that the first field effect transistor Q1 and the second field effect transistor Q2 have parasitic capacitances themselves, and play a role in parameter adjustment for resonance. The transformer T1 superimposes and amplifies the second waveform of the positive electrode and the second waveform of the negative electrode to output a second amplified waveform from a first end of the secondary side of the transformer T1 and a second end of the secondary side of the transformer T1; and the second amplified waveform is output after being subjected to blocking and filtering by a fourth capacitor C4 and a fifth capacitor C5. The second amplified waveform is a sine wave.
The embodiment of the utility model provides a still provide an electronic equipment, this electronic equipment includes foretell radio frequency signal output circuit.
In a particular implementation, the electronic device may include a radio frequency beauty treatment instrument.
The embodiment of the utility model provides an access supply voltage through switch circuit to according to control signal break-make, regard supply voltage as first voltage output when switching on, and stop regarding supply voltage as first voltage output when the disconnection; the waveform conversion circuit outputs a first amplified waveform when the first voltage is accessed, and outputs a second amplified waveform when the first voltage is not accessed; because the waveform transformation circuit outputs various waveforms according to the on-off of the first voltage, the various waveforms form various electric field distributions, and the various electric field distributions are applied to cell molecules to generate various periodic electric field time domain distributions, thereby enriching the functions of the product.
The above-mentioned embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present application, and they should be construed as being included in the present application.
Claims (10)
1. A radio frequency signal output circuit, comprising:
the switching circuit is configured to be connected with a power supply voltage, and is switched on and off according to a control signal so as to output the power supply voltage as a first voltage when the switching circuit is switched on and stop outputting the power supply voltage as the first voltage when the switching circuit is switched off;
and the waveform conversion circuit is connected with the switch circuit and is configured to output a first amplified waveform when the first voltage is accessed and output a second amplified waveform when the first voltage is not accessed.
2. The radio frequency signal output circuit according to claim 1, wherein the waveform conversion circuit includes:
the modulation circuit is connected with the switch circuit and is configured to output a first positive waveform and a first negative waveform when the first voltage is accessed, and output a second positive waveform and a second negative waveform when the first voltage is not accessed;
a transformer connected to the modulation circuit and the switching circuit and configured to superimpose and amplify the first waveform of the positive electrode and the first waveform of the negative electrode to output the first amplified waveform, or superimpose and amplify the second waveform of the positive electrode and the second waveform of the negative electrode to output the second amplified waveform;
wherein the first waveform of the positive electrode and the first waveform of the negative electrode have a phase difference of 180 degrees, and the second waveform of the positive electrode and the second waveform of the negative electrode have a phase difference of 180 degrees.
3. The radio frequency signal output circuit according to claim 2, wherein the first waveform and the first amplified waveform are square waves or approximate square waves, and the second waveform and the second amplified waveform are sine waves or approximate sine waves.
4. The rf signal output circuit of claim 2, wherein a first end of the primary side of the transformer and a tap of the primary side of the transformer are connected to a first waveform output terminal of an anode of the modulation circuit or a second waveform output terminal of the anode of the modulation circuit to access the first waveform of the anode or the second waveform of the anode;
the second end of the primary side of the transformer and a tap of the primary side of the transformer are connected with the first waveform output end of the cathode of the modulation circuit or the second waveform output end of the cathode of the modulation circuit so as to be connected with the first waveform of the cathode or the second waveform of the cathode;
and the first end of the secondary side of the transformer and the second end of the secondary side of the transformer are jointly used as a first amplified waveform output end of the transformer and a second amplified waveform output end of the transformer so as to output the first amplified waveform or the second amplified waveform.
5. The radio frequency signal output circuit according to claim 2, wherein the modulation circuit includes an inductive component, a first capacitive component, a second capacitive component, a first switching component, and a second switching component;
the first end of the inductive component, the first end of the first capacitive component and the first end of the second capacitive component are used as the input end of the supply voltage of the modulation circuit so as to be connected with the supply voltage;
the second end of the inductive component is used as a first voltage input end of the modulation circuit to be connected with the first voltage;
the second end of the inductive component, the second end of the second capacitive component and the input end of the second switching component are used as the waveform output end of the anode of the modulation circuit together to output the first waveform of the anode or the second waveform of the anode;
the second end of the inductive component, the second end of the first capacitive component and the input end of the first switch component are jointly used as the waveform output end of the cathode of the modulation circuit to output the first waveform of the cathode or the second waveform of the cathode;
the output end of the first switch component and the output end of the second switch component are connected to a power ground in common;
the control end of the first switch component is used as a first PWM signal input end of the modulation circuit so as to access a first PWM signal;
the control end of the second switch component is used as a second PWM signal input end of the modulation circuit so as to access a second PWM signal;
wherein the first PWM signal and the second PWM signal are complementary.
6. The radio frequency signal output circuit according to claim 5, wherein when the first voltage input terminal of the modulation circuit is connected to a first voltage, the first switch component is configured to be turned on and off according to the first PWM signal, so that the positive waveform output terminal of the modulation circuit outputs a positive first waveform; the second switch component is configured to be switched on and off according to the second PWM signal, so that the waveform output end of the negative pole of the modulation circuit outputs a first waveform of the negative pole.
7. The radio frequency signal output circuit according to claim 5, wherein when the first voltage input terminal of the modulation circuit is not connected to the first voltage, the inductive component, the second capacitive component and the transformer together form a first resonant cavity, and the first switching component is configured to perform resonant modulation on the first resonant cavity according to the first PWM signal, so that the positive waveform output terminal of the modulation circuit outputs a positive second waveform; the inductive component, the first capacitive component and the transformer together form a second resonant cavity, and the second switching component is configured to perform resonance modulation on the second resonant cavity according to the second PWM signal, so that the waveform output end of the negative electrode of the modulation circuit outputs a second waveform of the negative electrode.
8. The radio frequency signal output circuit according to claim 1, wherein the switch circuit includes a first field effect transistor, a second field effect transistor, a first resistor, and a second resistor;
the source electrode of the first field effect transistor and the first end of the second resistor are jointly used as a power supply voltage input end of the switch circuit to be connected with the power supply voltage;
the source electrode of the second field effect transistor and the first end of the first resistor are jointly used as a first voltage output end of the switch circuit and connected with the waveform conversion circuit to output the first voltage;
the drain electrode of the first field effect tube is connected with the drain electrode of the second field effect tube;
the grid electrode of the first field effect transistor, the grid electrode of the second field effect transistor, the second end of the second resistor and the second end of the first resistor are jointly used as the control signal input end of the switch circuit to be connected with the control signal.
9. The radio frequency signal output circuit according to claim 1, further comprising:
a DC blocking filter circuit connected to the waveform transformation circuit and configured to block and filter the first amplified waveform and the second amplified waveform.
10. An electronic device characterized in that it comprises a radio frequency signal output circuit according to any one of claims 1 to 9.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117503323A (en) * | 2023-12-14 | 2024-02-06 | 上海交通大学 | Radio frequency device for regulating and controlling temperature in skin |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117503323A (en) * | 2023-12-14 | 2024-02-06 | 上海交通大学 | Radio frequency device for regulating and controlling temperature in skin |
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