CN213156385U - Radio frequency instrument driving power supply and radio frequency instrument - Google Patents
Radio frequency instrument driving power supply and radio frequency instrument Download PDFInfo
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- CN213156385U CN213156385U CN202020401803.9U CN202020401803U CN213156385U CN 213156385 U CN213156385 U CN 213156385U CN 202020401803 U CN202020401803 U CN 202020401803U CN 213156385 U CN213156385 U CN 213156385U
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Abstract
The utility model relates to a radio frequency appearance drive power supply and radio frequency appearance, drive power supply includes: the voltage conversion unit is respectively connected with the power supply and the radio frequency power amplification unit of the radio frequency instrument and is used for converting the voltage of the power supply into a preset voltage and supplying the preset voltage to the radio frequency power amplification unit; the voltage feedback control unit comprises a voltage sampling circuit and a sampling voltage adjusting circuit, wherein the voltage sampling circuit is connected with the voltage conversion unit and is used for sampling the output voltage of the voltage conversion unit to obtain a voltage sampling value, and the sampling voltage adjusting circuit is connected with the voltage sampling circuit and is used for adjusting the voltage sampling value; and the first control unit is respectively connected with the voltage conversion unit and the voltage sampling circuit and used for controlling the voltage conversion unit to output preset voltage according to the voltage sampling value. The driving power supply can realize uniform power output of the same gear and power control of different gears, and the aim of multi-stage power regulation is achieved through multi-stage voltage regulation.
Description
Technical Field
The utility model relates to a radio frequency generator technical field especially relates to a radio frequency appearance drive power supply and radio frequency appearance.
Background
The radio frequency instrument is used as skin treatment equipment, radio frequency energy generated by the radio frequency instrument is transmitted to an end electrode through a lead, the radio frequency energy is transmitted to subcutaneous tissues through skin epidermis through the end electrode, radio frequency waves are generated at a specific depth under the skin and act on water molecules in dermal collagen, so that the water molecules with polarity move at a high speed to generate heat, the dermal collagen is heated, the dermal collagen is solidified at a low temperature and loses activity, and finally the dermal collagen falls off through the rejection of an organism, so that the aim of skin treatment is fulfilled.
To meet different treatment requirements, the radiofrequency instruments typically have a variety of different power steps. At present, the power adjustment of different gears of the radio frequency instrument generally adopts PWM (Pulse Width Modulation), specifically, a square wave with fixed frequency and adjustable Pulse Width is used to drive a power amplifying circuit of the radio frequency instrument, so that the power amplifying circuit periodically works in a clearance manner, and the average output power of the radio frequency instrument is adjusted by adjusting the working time of the clearance. However, in this approach, the actual output power of the RF meter is not uniform.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide a driving power source for a radio frequency instrument and a radio frequency instrument for solving the problem of non-uniform output power of the existing radio frequency instrument.
A rf instrument drive power supply comprising:
the voltage conversion unit is respectively connected with the power supply and the radio frequency power amplification unit of the radio frequency instrument and is used for converting the voltage of the power supply into a preset voltage and supplying the preset voltage to the radio frequency power amplification unit;
the voltage feedback control unit comprises a voltage sampling circuit and a sampling voltage adjusting circuit, wherein the voltage sampling circuit is connected with the voltage conversion unit and is used for sampling the output voltage of the voltage conversion unit to obtain a voltage sampling value, and the sampling voltage adjusting circuit is connected with the voltage sampling circuit and is used for adjusting the voltage sampling value;
and the first control unit is respectively connected with the voltage conversion unit and the voltage sampling circuit and used for controlling the voltage conversion unit to output preset voltage according to the voltage sampling value.
In one embodiment, the voltage sampling circuit comprises:
one end of the first resistor is connected with the output end of the voltage conversion unit;
and one end of the second resistor is connected with the other end of the first resistor and is provided with a first connecting point, the first connecting point is connected with the first control unit, and the other end of the second resistor is connected with the first grounding end.
In one embodiment, the sampled voltage adjustment circuit includes at least one first adjustment sub-circuit and/or at least one second adjustment sub-circuit, wherein,
each first adjusting sub-circuit comprises:
one end of the third resistor is connected with the first connecting point;
the first end of the first switch component is connected with the other end of the third resistor, and the second end of the first switch component is connected with the first grounding end;
each second adjustment sub-circuit comprises:
one end of the fourth resistor is connected with one end of the first resistor;
and a first end of the second switch component is connected with the other end of the fourth resistor, and a second end of the second switch component is connected with the first connecting point.
In one embodiment, the rf instrument driving power supply further includes a second control unit, the first switch assembly and the second switch assembly have the same structure, and the first switch assembly includes:
a first end of the first switch tube is connected with the other end of the third resistor, and a second end of the first switch tube is connected with a first grounding end;
one end of the fifth resistor is connected with the control end of the first switching tube, and the other end of the fifth resistor is connected with the second control unit;
and one end of the sixth resistor is connected with the other end of the fifth resistor, and the other end of the sixth resistor is connected with the first grounding end.
In one embodiment, the sampling voltage adjustment circuit includes a third adjustment sub-circuit and/or a fourth adjustment sub-circuit, wherein,
the third adjustment sub-circuit comprises:
one end of the seventh resistor is connected with the first connecting point;
one end of the first capacitor is connected with the other end of the seventh resistor, and the other end of the first capacitor is connected with the first grounding end;
one end of the eighth resistor is connected with the other end of the seventh resistor;
a first end of the third switch component is connected with the other end of the eighth resistor, and a second end of the third switch component is connected with the first grounding end;
the fourth adjustment sub-circuit includes:
one end of the ninth resistor is connected with one end of the first resistor;
one end of the second capacitor is connected with the other end of the ninth resistor, and the other end of the second capacitor is connected with the first connecting point;
one end of the tenth resistor is connected with the other end of the ninth resistor;
and a first end of the fourth switch component is connected with the other end of the tenth resistor, and a second end of the fourth switch component is connected with the first connecting point.
In one embodiment, the rf instrument driving power supply further includes a second control unit, the third switch assembly and the fourth switch assembly have the same structure, and the third switch assembly includes:
a first end of the second switch tube is connected with the other end of the eighth resistor, and a second end of the second switch tube is connected with the first grounding end;
one end of the eleventh resistor is connected with the control end of the second switching tube, and the other end of the eleventh resistor is connected with the second control unit;
and one end of the twelfth resistor is connected with the control end of the second switching tube, and the other end of the twelfth resistor is connected with the first grounding end.
In one embodiment, the driving power supply of the radio frequency instrument further comprises a current feedback control unit, and the current feedback control unit is respectively connected with the voltage conversion unit and the first control unit and is used for sampling the output current of the voltage conversion unit to obtain a current sampling value.
In one embodiment, the current feedback control unit includes:
one end of the thirteenth resistor is connected with the second grounding end, and the other end of the thirteenth resistor is connected with the first grounding end;
a fourteenth resistor, one end of which is connected to one end of the thirteenth resistor;
one end of the third capacitor is connected with the other end of the fourteenth resistor, and the other end of the third capacitor is connected with the other end of the thirteenth resistor;
one end of the fifteenth resistor is connected with one end of the thirteenth resistor, and the other end of the fifteenth resistor is connected with the first control unit;
one end of the sixteenth resistor is connected with the other end of the thirteenth resistor, and the other end of the sixteenth resistor is connected with the first control unit;
the first grounding terminal is the reference ground of the radio frequency instrument, and the second grounding terminal is the reference ground of the radio frequency power amplification unit.
In one embodiment, the driving power supply of the radio frequency instrument further comprises a second control unit, and the other end of the fourteenth resistor is further connected with the second control unit.
A radio frequency instrument comprises the radio frequency instrument driving power supply.
The radio frequency instrument driving power supply and the radio frequency instrument comprise a voltage conversion unit, a voltage feedback control unit and a first control unit, wherein the voltage conversion unit is respectively connected with a power supply and a radio frequency power amplification unit of the radio frequency instrument and is used for converting the voltage of the power supply into a preset voltage and supplying the preset voltage to the radio frequency power amplification unit; the voltage feedback control unit comprises a voltage sampling circuit and a sampling voltage adjusting circuit, the voltage sampling circuit is connected with the voltage conversion unit and is used for sampling the output voltage of the voltage conversion unit to obtain a voltage sampling value, and the sampling voltage adjusting circuit is connected with the voltage sampling circuit and is used for adjusting the voltage sampling value; the first control unit is respectively connected with the voltage conversion unit and the voltage sampling circuit and used for controlling the voltage conversion unit to output preset voltage according to the voltage sampling value. Therefore, the voltage sampling value of the output voltage of the voltage conversion unit is adjusted through the sampling voltage adjusting circuit, the output voltage of the voltage conversion unit is controlled according to the voltage sampling value, the power uniform output of the same gear can be achieved, the power control of different gears can be achieved, namely, the power uniform output of the same gear and the power control of different gears are achieved by adjusting the voltage of the driving power supply of the radio frequency power amplifying unit, and the purpose of multi-level power regulation is achieved through multi-level voltage regulation.
Drawings
FIG. 1 is a schematic structural diagram of a driving power supply of a radio frequency instrument in a first embodiment;
FIG. 2 is a schematic circuit diagram of the RF meter driving power supply according to the first embodiment;
FIG. 3 is a schematic circuit diagram of a second embodiment of the RF meter driver power supply;
FIG. 4 is a schematic structural diagram of a driving power supply of the RF meter according to the second embodiment;
FIG. 5 is a schematic circuit diagram of a driving power supply of the RF meter according to a third embodiment;
fig. 6 is a schematic circuit diagram of a driving power supply of the rf instrument in the fourth embodiment.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention can be embodied in many different forms other than those specifically described herein, and it will be apparent to those skilled in the art that similar modifications can be made without departing from the spirit and scope of the invention, and it is therefore not to be limited to the specific embodiments disclosed below.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
Fig. 1 is a schematic structural diagram of an embodiment of an rf instrument driving power supply, and as shown in fig. 1, the rf instrument driving power supply includes a voltage conversion unit 10, a voltage feedback control unit 20, and a first control unit 30. The voltage conversion unit 10 is respectively connected with the power supply and the radio frequency power amplification unit of the radio frequency instrument, and is used for converting the voltage of the power supply into a preset voltage and supplying the preset voltage to the radio frequency power amplification unit; the voltage feedback control unit 20 comprises a voltage sampling circuit 21 and a sampling voltage adjusting circuit 22, wherein the voltage sampling circuit 21 is connected with the voltage conversion unit 10 and is used for sampling the output voltage of the voltage conversion unit 10 to obtain a voltage sampling value, and the sampling voltage adjusting circuit 22 is connected with the voltage sampling circuit 21 and is used for adjusting the voltage sampling value; the first control unit 30 is respectively connected to the voltage conversion unit 10 and the voltage sampling circuit 21, and is configured to control the voltage conversion unit 10 to output a preset voltage according to the voltage sampling value.
Specifically, the input end of the voltage conversion unit 10 is connected to a power supply, and the output end is connected to the rf power amplification unit, so as to implement voltage conversion and voltage stabilization, and provide the converted voltage to the rf power amplification unit. When the rf power amplifying unit is powered by dc, the voltage converting unit 10 may include a DCDC converting circuit, an ACDC converting circuit, or a converting circuit composed of an ACDC converting circuit and a DCDC converting circuit, where the DCDC converting circuit may include a BUCK circuit, a BOOST circuit, or a BUCK-BOOST circuit, and which circuit structure is specifically adopted may be selected according to actual requirements.
The voltage feedback control unit 20 includes a voltage sampling circuit 21 and a sampling voltage adjusting circuit 22. The input end of the voltage sampling circuit 21 is connected to the output end of the voltage conversion unit 10, the output end of the voltage sampling circuit 21 is connected to the first control unit 30, and the voltage sampling circuit 21 may be a voltage division circuit, and is configured to sample the output voltage of the voltage conversion unit 10 to obtain a voltage sampling value. The first control unit 30 compares the voltage sampling value with an internal preset voltage (i.e., a reference voltage), outputs a corresponding control signal to the voltage conversion unit 10 according to the comparison result, controls the voltage conversion unit 10, and ensures that the voltage conversion unit 10 outputs a stable voltage, which is provided to the rf power amplification unit to output a corresponding power. Therefore, the uniform power output of the same gear is realized by adjusting the voltage of the driving power supply of the radio frequency power amplification unit.
The sampling voltage adjusting circuit 22 is connected to the voltage sampling circuit 21 and is configured to adjust a voltage sampling value, so as to adjust an output voltage of the voltage converting unit 10, and further adjust an output power of the rf power amplifying unit, thereby achieving an output power adjustment purpose. Specifically, assuming that the output power of the rf power amplifying unit needs to be adjusted from the first level to the second level, the sampling voltage adjusting circuit 22 may adjust the voltage sampling value to be lower by one level, and at this time, the first control unit 30 adjusts the control signal of the voltage converting unit 10 according to the comparison result between the adjusted voltage sampling value and the internal preset voltage, so as to increase the output voltage of the voltage converting unit 10, and as the output voltage of the voltage converting unit 10 increases, the driving capability of the rf power amplifying unit is increased, so that the output power of the rf power amplifying unit is increased, thereby achieving the purpose of adjusting the output power. Similarly, if the output power needs to be reduced, for example, if the output power is adjusted from the second gear to the first gear, the output power can be reduced by adjusting the output voltage of the voltage converting unit 10 to be reduced, which is not illustrated here. Therefore, power control of different gears is realized by adjusting the voltage sampling value of the output voltage of the voltage conversion unit and adjusting the voltage of the driving power supply of the radio frequency power amplification unit according to the voltage sampling value.
In practical applications, when the voltage sampling circuit 21 is a voltage divider circuit, the sampling voltage adjusting circuit 22 may be a resistance value adjusting circuit, and the purpose of adjusting the voltage sampling value is achieved by adjusting the resistance value or equivalent resistance value of a resistor in the voltage divider circuit. For example, the resistance value of the resistor in the voltage dividing circuit may be directly changed, or the resistor may be connected in series or in parallel to change the equivalent resistance value of the resistor in the voltage dividing circuit, which is not limited herein.
The first control unit 30 is respectively connected to the voltage sampling circuit 21 and the voltage conversion unit 10, and is configured to perform corresponding control according to a set program, and the first control unit 30 may be a controller, which is not limited herein.
In this embodiment, the voltage sampling value of the output voltage of the voltage conversion unit is adjusted by the sampling voltage adjustment circuit, and the output voltage of the voltage conversion unit is controlled according to the voltage sampling value, so that not only can uniform power output of the same gear be achieved, but also power control of different gears can be achieved, that is, uniform power output of the same gear and power control of different gears can be achieved by adjusting the voltage of the driving power supply of the radio frequency power amplification unit, and the purpose of multi-level power adjustment can be achieved by multi-level voltage adjustment.
In one embodiment, referring to fig. 2, the voltage sampling circuit 21 includes a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected to the output terminal VRF _ V of the voltage conversion unit 10; one end of the second resistor R2 is connected to the other end of the first resistor R1 and has a first connection point J1, the first connection point J1 is connected to the first control unit 30, and the other end of the second resistor R2 is connected to the first ground GND. The circuit structure not only can realize the sampling of the output voltage of the voltage conversion unit, but also has simple structure and low cost.
In some embodiments, the sampling voltage adjustment circuit 22 includes at least one first adjustment sub-circuit and/or at least one second adjustment sub-circuit, that is, the sampling voltage adjustment circuit 22 may include one or more first adjustment sub-circuits; alternatively, one or more second adjustment sub-circuits are included; alternatively, one or more first adjustment sub-circuits and one or more second adjustment sub-circuits are included.
As shown in fig. 2, each of the first adjusting sub-circuits includes a third resistor (e.g., R31, R32, R33, and R34) and a first switching element, and one end of the third resistor is connected to the first connection point J1; the first end of the first switch component is connected with the other end of the third resistor, and the second end of the first switch component is connected with the first grounding end GND.
The first switch component is mainly used for controlling whether the third resistor (such as R31, R32, R33 and R34) is connected in parallel with the second resistor R2 or not so as to change the equivalent resistance value of the second resistor R2, thereby changing the voltage sampling value of the output voltage of the voltage conversion unit 10, further changing the output power of the radio frequency power amplification unit, and realizing power adjustment of different gears. For example, if the output power of the rf power amplifying unit needs to be adjusted from the first gear to the second gear at present, the first switch assembly may be controlled to be closed, so that the third resistor R31 is connected in parallel with the second resistor R2, at this time, the equivalent resistance value of the second resistor R2 is reduced, the corresponding voltage sampling value is reduced, and the first control unit 30 adjusts the control signal of the voltage converting unit 10 according to the comparison result between the adjusted voltage sampling value and the internal setting voltage, so as to increase the output voltage of the voltage converting unit 10, thereby increasing the output power of the rf power amplifying unit and achieving the purpose of switching power in different gears.
In practical application, the first switch component may be a mechanical switch component, or may also be an electronic switch component, and when the first switch component is a mechanical switch component, the first switch component may be formed by a key or a knob, etc.; when the electronic switch assembly is an electronic switch assembly, the electronic switch assembly may be composed of a controllable switch tube and the like, and is not limited herein.
Therefore, the size of the voltage sampling value of the output voltage of the voltage conversion unit can be changed by adjusting the equivalent resistance value of the second resistor, and further the power adjustment of different gears is realized.
Each second adjustment sub-circuit comprises: a fourth resistor and a second switch component, wherein one end of the fourth resistor is connected with one end of the first resistor R1; the first end of the second switch component is connected with the other end of the fourth resistor, and the second end of the second switch component is connected with the first connecting point.
It should be noted that, the second adjustment sub-circuit has the same structure as the first adjustment sub-circuit, and the difference is that the second adjustment sub-circuit is used for adjusting the equivalent resistance value of the first resistor R1, and the specific working principle can refer to the foregoing description, and is not described herein again. Therefore, the size of the voltage sampling value of the output voltage of the voltage conversion unit can be changed by adjusting the equivalent resistance value of the first resistor, and further the power adjustment of different gears is realized.
In addition, the purpose of adjusting the voltage sampling value can also be achieved by adjusting the equivalent resistance value of the first resistor R1 and the equivalent resistance value of the second resistor R2 at the same time, and the adjustment can be specifically selected according to actual requirements. In addition, the purpose of adjusting the voltage sampling value can also be achieved by serially connecting a resistor between the second resistor R2 and the first ground GND and/or serially connecting a resistor between the first resistor R1 and the output terminal VRF _ V of the voltage conversion unit 10, which is not limited herein as long as the purpose of adjusting the voltage sampling value can be achieved.
In one embodiment, the rf driving power supply further includes a second control unit (not shown), which may be an IO port of a remote controller or other IC or may be integrated with the first control unit 30. The first switch assembly and the second switch assembly have the same structure, and as shown in fig. 2, the first switch assembly includes: a first switch tube (such as Q11, Q12, Q13 and Q14), a fifth resistor (such as R51, R52, R53 and R54) and a sixth resistor (such as R61, R62, R63 and R64), wherein the first end of the first switch tube is connected with the other end of the third resistor, and the second end of the first switch tube is connected with a first ground terminal GND; one end of a fifth resistor is connected with the control end of the first switching tube, and the other end of the fifth resistor is connected with the second control unit; one end of the sixth resistor is connected to the other end of the fifth resistor, and the other end of the sixth resistor is connected to the first ground GND.
Specifically, the first switch module and the second switch module may be formed by power switch tubes, and the second control unit controls the on or off of the corresponding power switch tubes according to the power requirement, so as to connect resistors with different resistances in parallel to the second resistor R2 and/or the first resistor R1, thereby changing the equivalent resistance of the second resistor R2 and/or the first resistor R1, further changing the voltage sampling value of the output voltage of the voltage conversion unit 10, and finally changing the output power of the radio frequency power amplification unit, thereby implementing adjustment of different gear powers.
In other embodiments, the sampling voltage adjustment circuit 22 includes a third adjustment sub-circuit and/or a fourth adjustment sub-circuit, that is, the sampling voltage adjustment circuit 22 may include the third adjustment sub-circuit, or the fourth adjustment sub-circuit, or both the third adjustment sub-circuit and the fourth adjustment sub-circuit.
As shown in fig. 3, the third adjusting sub-circuit includes a seventh resistor R7, a first capacitor C1, an eighth resistor R8 and a third switching element, and one end of the seventh resistor R7 is connected to the first connection point J1; one end of the first capacitor C1 is connected to the other end of the seventh resistor R7, and the other end of the first capacitor C1 is connected to the first ground GND; one end of the eighth resistor R8 is connected with the other end of the seventh resistor R7; a first terminal of the third switching component is connected to the other terminal of the eighth resistor R8, and a second terminal of the third switching component is connected to the first ground GND.
The third switch component is mainly used for changing the charging and discharging time of the first capacitor C1, and changing the equivalent resistance value between the first connecting point J1 to the seventh resistor R7 connected in series between the first capacitor C1 and the first ground GND by changing the charging and discharging time of the first capacitor C1, so as to change the equivalent resistance value of the second resistor R2, further change the voltage sampling value of the output voltage of the voltage conversion unit 10, and finally realize the power adjustment of different gears. In practical application, the third switch assembly is an electronic switch assembly, and may specifically be composed of a controllable switch tube and the like, and the on-off duration of the third switch assembly is controlled by outputting a control signal such as a PWM signal to the controllable switch tube, so as to change the charging and discharging time of the first capacitor C1, and finally realize power adjustment of different gears.
Therefore, the equivalent resistance value of the second resistor can be adjusted by changing the charging and discharging time of the capacitor, so that the voltage sampling value of the output voltage of the voltage conversion unit is changed, and the power adjustment of different gears is realized.
The fourth adjusting sub-circuit comprises a ninth resistor, a second capacitor, a tenth resistor and a fourth switch component, wherein one end of the ninth resistor is connected with one end of the first resistor R1; one end of the second capacitor is connected with the other end of the ninth resistor, and the other end of the second capacitor is connected with the first connecting point J1; one end of the tenth resistor is connected with the other end of the ninth resistor; a first terminal of the fourth switching element is connected to the other terminal of the tenth resistor, and a second terminal of the fourth switching element is connected to the first connection point J1.
It should be noted that, the fourth adjustment sub-circuit has the same structure as the third adjustment sub-circuit, and the difference is that the fourth adjustment sub-circuit is used for adjusting the equivalent resistance value of the first resistor R1, and specific working principles can be referred to before, and are not described herein again. Therefore, the equivalent resistance value of the first resistor can be adjusted by changing the charging and discharging time of the capacitor, so that the voltage sampling value of the output voltage of the voltage conversion unit is changed, and the power adjustment of different gears is realized. In addition, the equivalent resistance value of the first resistor and the equivalent resistance value of the second resistor can be adjusted simultaneously by changing the charging and discharging time of the capacitor, so that the purpose of adjusting the voltage sampling value is achieved, and the setting can be selected according to actual requirements.
In one embodiment, referring to fig. 3, the third switching component and the fourth switching component have the same structure, the third switching component includes a second switching tube Q2, an eleventh resistor R11 and a twelfth resistor R12, a first end of the second switching tube Q2 is connected to the other end of the eighth resistor R8, and a second end of the second switching tube Q2 is connected to the first ground GND; one end of an eleventh resistor R11 is connected with the control end of the second switching tube Q2, and the other end of the eleventh resistor R11 is connected with the second control unit; one end of the twelfth resistor R12 is connected to the control terminal of the second switch Q2, and the other end of the twelfth resistor R12 is connected to the first ground GND.
Specifically, the third switch component and the fourth switch component may be formed by power switch tubes, and the second control unit outputs PWM signals with different duty ratios to corresponding switch tubes according to power requirements, and changes the charging and discharging time of the capacitor by controlling the on/off duration of the corresponding switch tubes, so as to change the equivalent resistance value of the second resistor R2 and/or the first resistor R1, further change the voltage sampling value of the output voltage of the voltage conversion unit 10, and finally change the output power of the radio frequency power amplification unit, thereby implementing adjustment of different gears.
In an embodiment, referring to fig. 4, the rf instrument driving power supply further includes a current feedback control unit 40, and the current feedback control unit 40 is respectively connected to the voltage conversion unit 10 and the first control unit 30, and is configured to sample the output current of the voltage conversion unit 10 to obtain a current sample value.
Currently, most radio frequency instruments adopt a constant voltage output mode, the output power of the output mode depends on the magnitude of load impedance between end electrodes (positive electrode and negative electrode) of the radio frequency instrument, and the output power is determined according to the condition that P is equal to U2The smaller the load impedance, the larger the output power. However, there is a difference in the human skin, and when the human skin impedance is too small, it may cause the output power of the radiofrequency meter to be too large, thereby causing the possibility of skin burn. Meanwhile, the end electrode of the radiofrequency instrument is exposed, when the positive electrode and the negative electrode are accidentally short-circuited, the load impedance is close to 0, the output power is extremely high, and hidden dangers such as damage of an internal circuit of the radiofrequency instrument, over-high temperature of an external object and the like can be caused. Based on this, this application limits the maximum output power of radio frequency appearance through the hardware, restricts output power in the safe range to avoid the emergence of above-mentioned condition.
Specifically, since the consumed power of the radio frequency power amplifying unit depends on the load impedance between the end electrodes of the radio frequency meter, and the output power of the voltage converting unit 10 is equal to the consumed power of the radio frequency power amplifying unit, when the output voltage of the voltage converting unit 10 is not changed, the consumed power of the radio frequency power amplifying unit and the output current of the voltage converting unit 10 have a positive correlation, and therefore, the limitation of the maximum output power can be realized according to the magnitude of the output current of the voltage converting unit 10 by sampling the magnitude of the output current.
Specifically, the input end of the current feedback control unit 40 is connected to the output end of the voltage conversion unit 10, the output end of the current feedback control unit 40 is connected to the first control unit 30, and is configured to sample and convert the output current of the voltage conversion unit 10 into a voltage value, the first control unit 30 compares the voltage value with an internal voltage threshold, and when the voltage value is greater than the internal voltage threshold, adjusts the control signal of the voltage conversion unit 10 to reduce the output voltage of the voltage conversion unit 10, so that the output power of the rf power amplification unit is reduced, and the output power is limited within a safe range.
In the embodiment, the maximum output power of the radio frequency power amplification unit is limited in real time through hardware, the output power is limited within a safety range, and when the output power is overlarge, the output voltage of the voltage conversion unit can be automatically reduced within a few microseconds, so that the output power of the radio frequency power amplification unit is reduced, and the effects of preventing skin burn and short circuit overcurrent protection are achieved.
In one embodiment, as shown with reference to fig. 4-6, the current feedback control unit 40 includes: a thirteenth resistor R13, a fourteenth resistor R14, a third capacitor C3, a fifteenth resistor R15 and a sixteenth resistor R16. One end of the thirteenth resistor R13 is connected to the second ground terminal RF _ GND, and the other end of the thirteenth resistor R13 is connected to the first ground terminal GND; one end of the fourteenth resistor R14 is connected to one end of the thirteenth resistor R13; one end of a third capacitor C3 is connected with the other end of the fourteenth resistor R14, and the other end of the third capacitor C3 is connected with the other end of the thirteenth resistor R13; one end of the fifteenth resistor R15 is connected to one end of the thirteenth resistor R13, and the other end of the fifteenth resistor R15 is connected to the first control unit 30; one end of a sixteenth resistor R16 is connected to the other end of the thirteenth resistor R13, and the other end of the sixteenth resistor R16 is connected to the first control unit 30. The first ground terminal GND is a reference ground of the RF instrument, and the second ground terminal RF _ GND is a reference ground of the RF power amplifying unit.
Specifically, referring to fig. 4-6, the output current of the voltage conversion unit 10 flows through a thirteenth resistor R13 to generate a sampling voltage Us, the first control unit 30 collects the sampling voltage Us through the built-in ADC, compares the sampling voltage Us with an internal voltage threshold Umax, and adjusts the control signal of the voltage conversion unit 10 to reduce the output voltage of the voltage conversion unit 10 when the sampling voltage Us is greater than the internal voltage threshold Umax, while the current remains unchanged, so as to finally reduce the output power of the rf power amplification unit, thereby effectively preventing skin burn and short circuit overcurrent protection; conversely, when the sampling voltage Us is less than or equal to the internal voltage threshold Umax, the output voltage of the voltage conversion unit 10 remains unchanged.
Further, based on the current feedback control unit 40, through software processing, a function of detecting whether the tip electrode of the radiofrequency meter is attached to the skin can also be realized.
In one embodiment, referring to fig. 5 to 6, the other end of the fourteenth resistor R14 is further connected to a second control unit, and the second control unit collects the sampling voltage Us through a built-in ADC and detects whether the skin is close to the end electrode of the radiofrequency meter according to the sampling voltage Us.
Specifically, since the power consumption of the rf power amplifying unit depends on the load impedance between the end electrodes of the rf meter, and the load impedance when the end electrodes of the rf meter are attached to the skin is smaller than when the end electrodes of the rf meter are not attached to the skin, the power consumption when the skin is attached to the skin is larger than the power consumption when the skin is not attached to the skin, and the sampling voltage Us when the skin is attached to the skin is larger than the sampling voltage Us when the skin is not attached to the skin, the judgment of whether the skin is attached to the skin can be achieved by setting a voltage value Ust in the second control unit and comparing the voltage value Ust with the sampling voltage Us. If Us is larger than Ust, judging that an end electrode of the radio frequency instrument is attached to the skin; on the contrary, the end electrode of the radiofrequency instrument is not closely attached to the skin.
In this embodiment, the output current of the voltage conversion unit is sampled and converted into the sampling voltage by the current feedback control unit, and the output voltage of the voltage conversion unit is controlled by the sampling voltage, so that the output power of the radio frequency instrument can be limited within a safe range, skin burn can be effectively prevented, short-circuit overcurrent protection can be realized, and judgment on whether the skin is tightly attached to an end electrode of the radio frequency instrument can be realized.
The application also provides a radio frequency instrument which comprises the radio frequency instrument driving power supply.
Through the driving power supply, the radio frequency instrument not only can realize uniform power output of the same gear and power adjustment of different gears, but also can prevent skin from being burnt and realize short circuit overcurrent protection, and can realize judgment of whether the skin is tightly attached to an end electrode of the radio frequency instrument.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A radio frequency instrument drive power supply, comprising:
the voltage conversion unit is respectively connected with a power supply and a radio frequency power amplification unit of the radio frequency instrument and is used for converting the voltage of the power supply into a preset voltage and supplying the preset voltage to the radio frequency power amplification unit;
the voltage feedback control unit comprises a voltage sampling circuit and a sampling voltage adjusting circuit, wherein the voltage sampling circuit is connected with the voltage conversion unit and is used for sampling the output voltage of the voltage conversion unit to obtain a voltage sampling value, and the sampling voltage adjusting circuit is connected with the voltage sampling circuit and is used for adjusting the voltage sampling value;
and the first control unit is respectively connected with the voltage conversion unit and the voltage sampling circuit and is used for controlling the voltage conversion unit to output the preset voltage according to the voltage sampling value.
2. The rf meter drive power supply of claim 1 wherein the voltage sampling circuit comprises:
one end of the first resistor is connected with the output end of the voltage conversion unit;
and one end of the second resistor is connected with the other end of the first resistor and is provided with a first connecting point, the first connecting point is connected with the first control unit, and the other end of the second resistor is connected with a first grounding end.
3. The RF meter drive power supply of claim 2, wherein the sampled voltage adjustment circuit comprises at least one first adjustment sub-circuit and/or at least one second adjustment sub-circuit, wherein,
each of the first adjusting sub-circuits includes:
one end of the third resistor is connected with the first connecting point;
a first end of the first switch component is connected with the other end of the third resistor, and a second end of the first switch component is connected with the first grounding end;
each of the second adjustment sub-circuits includes:
one end of the fourth resistor is connected with one end of the first resistor;
and a first end of the second switch component is connected with the other end of the fourth resistor, and a second end of the second switch component is connected with the first connecting point.
4. The RF meter driving power supply according to claim 3, further comprising a second control unit, wherein the first switch assembly and the second switch assembly are identical in structure, and wherein the first switch assembly comprises:
a first end of the first switch tube is connected with the other end of the third resistor, and a second end of the first switch tube is connected with the first grounding end;
one end of the fifth resistor is connected with the control end of the first switching tube, and the other end of the fifth resistor is connected with the second control unit;
and one end of the sixth resistor is connected with the other end of the fifth resistor, and the other end of the sixth resistor is connected with the first grounding terminal.
5. The RF meter drive power supply of claim 2, wherein the sampled voltage adjustment circuit comprises a third adjustment sub-circuit and/or a fourth adjustment sub-circuit, wherein,
the third adjustment sub-circuit comprises:
one end of the seventh resistor is connected with the first connecting point;
one end of the first capacitor is connected with the other end of the seventh resistor, and the other end of the first capacitor is connected with the first grounding end;
one end of the eighth resistor is connected with the other end of the seventh resistor;
a first end of the third switch component is connected with the other end of the eighth resistor, and a second end of the third switch component is connected with the first grounding end;
the fourth adjustment sub-circuit comprises:
one end of the ninth resistor is connected with one end of the first resistor;
one end of the second capacitor is connected with the other end of the ninth resistor, and the other end of the second capacitor is connected with the first connecting point;
a tenth resistor, one end of which is connected to the other end of the ninth resistor;
and a first end of the fourth switch component is connected with the other end of the tenth resistor, and a second end of the fourth switch component is connected with the first connecting point.
6. The RF meter driving power supply according to claim 5, further comprising a second control unit, wherein the third switch assembly and the fourth switch assembly are identical in structure, and wherein the third switch assembly comprises:
a first end of the second switch tube is connected with the other end of the eighth resistor, and a second end of the second switch tube is connected with the first ground terminal;
one end of the eleventh resistor is connected with the control end of the second switching tube, and the other end of the eleventh resistor is connected with the second control unit;
and one end of the twelfth resistor is connected with the control end of the second switching tube, and the other end of the twelfth resistor is connected with the first grounding end.
7. The RF instrument driving power supply according to any one of claims 1-3, further comprising a current feedback control unit, wherein the current feedback control unit is respectively connected to the voltage conversion unit and the first control unit, and is configured to sample the output current of the voltage conversion unit to obtain a current sample value.
8. The RF meter driving power supply according to claim 7, wherein the current feedback control unit comprises:
one end of the thirteenth resistor is connected with a second grounding end, and the other end of the thirteenth resistor is connected with the first grounding end;
a fourteenth resistor, one end of which is connected to one end of the thirteenth resistor;
one end of the third capacitor is connected with the other end of the fourteenth resistor, and the other end of the third capacitor is connected with the other end of the thirteenth resistor;
one end of the fifteenth resistor is connected with one end of the thirteenth resistor, and the other end of the fifteenth resistor is connected with the first control unit;
one end of the sixteenth resistor is connected with the other end of the thirteenth resistor, and the other end of the sixteenth resistor is connected with the first control unit;
the first ground terminal is a reference ground of the radio frequency instrument, and the second ground terminal is a reference ground of the radio frequency power amplification unit.
9. The RF meter driving power supply according to claim 8, further comprising a second control unit, wherein the other end of the fourteenth resistor is further connected to the second control unit.
10. A radiofrequency meter, characterized by comprising a radiofrequency meter driving power supply according to any one of claims 1 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020401803.9U CN213156385U (en) | 2020-03-25 | 2020-03-25 | Radio frequency instrument driving power supply and radio frequency instrument |
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| CN202020401803.9U CN213156385U (en) | 2020-03-25 | 2020-03-25 | Radio frequency instrument driving power supply and radio frequency instrument |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113662650A (en) * | 2021-08-10 | 2021-11-19 | 苏州艾科脉医疗技术有限公司 | High voltage generating circuit for catheter and ablation tool |
| CN115350401A (en) * | 2022-09-09 | 2022-11-18 | 深圳市宗匠科技有限公司 | Gear switching method, beauty instrument and computer readable storage medium |
| CN116660716A (en) * | 2022-06-21 | 2023-08-29 | 上海微创惟美医疗科技(集团)有限公司 | No-load detection method and circuit |
| CN116660716B (en) * | 2022-06-21 | 2024-06-28 | 上海微创惟美医疗科技(集团)有限公司 | No-load detection method and circuit |
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- 2020-03-25 CN CN202020401803.9U patent/CN213156385U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113662650A (en) * | 2021-08-10 | 2021-11-19 | 苏州艾科脉医疗技术有限公司 | High voltage generating circuit for catheter and ablation tool |
| CN113662650B (en) * | 2021-08-10 | 2024-01-23 | 苏州艾科脉医疗技术有限公司 | High voltage generating circuit for catheter and ablation instrument |
| CN116660716A (en) * | 2022-06-21 | 2023-08-29 | 上海微创惟美医疗科技(集团)有限公司 | No-load detection method and circuit |
| CN116660716B (en) * | 2022-06-21 | 2024-06-28 | 上海微创惟美医疗科技(集团)有限公司 | No-load detection method and circuit |
| CN115350401A (en) * | 2022-09-09 | 2022-11-18 | 深圳市宗匠科技有限公司 | Gear switching method, beauty instrument and computer readable storage medium |
| CN115350401B (en) * | 2022-09-09 | 2024-05-28 | 深圳市宗匠科技有限公司 | Gear switching method, cosmetic instrument and computer readable storage medium |
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