CN216703183U - Frequency control circuit and magnetic therapy apparatus - Google Patents
Frequency control circuit and magnetic therapy apparatus Download PDFInfo
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- CN216703183U CN216703183U CN202120028409.XU CN202120028409U CN216703183U CN 216703183 U CN216703183 U CN 216703183U CN 202120028409 U CN202120028409 U CN 202120028409U CN 216703183 U CN216703183 U CN 216703183U
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- 238000002653 magnetic therapy Methods 0.000 title claims abstract description 24
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 22
- 230000006641 stabilisation Effects 0.000 claims abstract description 14
- 238000011105 stabilization Methods 0.000 claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims description 12
- 230000009467 reduction Effects 0.000 claims description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 12
- 230000033228 biological regulation Effects 0.000 description 11
- 238000000034 method Methods 0.000 description 10
- 230000001225 therapeutic effect Effects 0.000 description 7
- 230000009471 action Effects 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000001467 acupuncture Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
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- 238000005859 coupling reaction Methods 0.000 description 1
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Abstract
The utility model discloses a frequency control circuit applied to a magnetic therapy apparatus. In the scheme, an adjustable voltage stabilizing chip, a first resistor, N preset resistance values of second resistors, N switches and a processor are arranged, wherein the resistance values of the N second resistors are different, and N is an integer not less than 2. Because the output voltage of the adjustable voltage stabilization chip is related to the first resistor and the second resistor, the resistance value of the first resistor is fixed, the processor controls the sequential conduction of the N switches, and then the N second resistors with different resistance values are sequentially connected into the circuit. Therefore, the processor can enable the output end of the adjustable voltage stabilizing chip to obtain voltage signals with different frequencies by controlling the N switches to be sequentially conducted. The utility model also discloses a magnetic therapy apparatus which has the same beneficial effect as the frequency control circuit.
Description
Technical Field
The utility model relates to the field of electronic circuits and medical equipment, in particular to a frequency control circuit and a magnetic therapy apparatus.
Background
The magnetic therapeutic apparatus is an apparatus which utilizes magnetic field to act on human acupuncture points or affected parts to achieve the therapeutic purpose.
The coil in the magnetic therapy apparatus needs sine waves to generate a magnetic field, and different magnetic fields can be generated when the frequency and the voltage of the sine waves are different, so that the magnetic therapy apparatus can achieve different treatment effects. In the prior art, the power grid voltage supplies power to the magnetic therapy instrument after rectification and transformation, the power grid voltage can obtain a low-voltage signal through a transformer, but the frequency of the power grid voltage cannot be changed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a frequency control circuit and a magnetic therapy apparatus, which can enable the output end of an adjustable voltage-stabilizing chip to obtain voltage signals with different frequencies.
In order to solve the above technical problem, the present invention provides a frequency control circuit applied to a magnetic therapy apparatus, including:
the input end is connected with an adjustable voltage stabilizing chip of direct current;
the first resistor is connected between the output end and the control end of the adjustable voltage-stabilizing chip in parallel;
the first end of the second resistor is respectively connected with the control end of the adjustable voltage stabilizing chip;
the first ends of the N switches are respectively connected with the second ends of the N second resistors, the second ends of the N switches are all grounded, and the control ends of the N switches are all connected with the processor;
the processor is used for controlling the N switches to be sequentially switched on based on a preset frequency so that the output end of the adjustable voltage stabilizing chip can generate a voltage signal of a target frequency;
the resistance values of the N second resistors are different, and N is an integer not less than 2.
Preferably, the switch is a photoelectric coupler, an anode of a light emitting diode of the photoelectric coupler is connected with the processor, a cathode of the light emitting diode is grounded, a collector of a phototriode of the photoelectric coupler is respectively connected with a second end of the second resistor, and an emitter of the phototriode is grounded;
the collector of the phototriode is used as a first end of the switch, the emitter of the phototriode is used as a second end of the switch, and the anode of the light-emitting diode is used as a control end of the switch.
Preferably, the method further comprises the following steps:
the first end of the pull-up resistor is connected with a power supply, and the second end of the pull-up resistor is connected with the anodes of the N light-emitting diodes of the switches in a one-to-one correspondence mode.
Preferably, the method further comprises the following steps:
the input end of the transformer is connected with a power supply of the power grid, and the output end of the transformer is connected with the rectification module and used for reducing the voltage of the alternating current provided by the power grid;
the output end of the rectifying module is connected with the input end of the adjustable voltage-stabilizing chip and is used for converting the alternating current after voltage reduction into the direct current.
Preferably, the method further comprises the following steps:
the first capacitor is connected with the input end of the adjustable voltage-stabilizing chip at the first end and grounded at the second end;
and/or the first end of the second capacitor is connected with the output end of the adjustable voltage-stabilizing chip, and the second end of the second capacitor is grounded.
Preferably, the magnetic therapy apparatus comprises a coil;
the frequency control circuit further includes:
and the H-bridge circuit is used for obtaining a sine wave signal based on the voltage signal so that the coil can generate a magnetic field.
Preferably, the H-bridge circuit includes:
the first switch is connected with the output end of the adjustable voltage-stabilizing chip at a first end, connected with a first end of a third switch and a second end of the coil at a second end, and connected with the processor at a control end;
the first end of the second switch is connected with the output end of the adjustable voltage stabilizing chip, the second end of the second switch is connected with the first end of the fourth switch and the first end of the coil, and the control end of the second switch is connected with the processor;
the third switch is connected with the second end of the second switch and the control end of the second switch is connected with the processor;
the fourth switch is grounded at a second end, and a control end is connected with the processor;
the processor is further configured to control the first switch, the second switch, the third switch, and the fourth switch to be turned on or off.
Preferably, the method further comprises the following steps:
the first current limiting resistor is connected with the output end of the adjustable voltage stabilizing chip at the first end and connected with the first end of the first switch at the second end;
and/or the first end of the second current limiting resistor is connected with the output end of the adjustable voltage stabilizing chip, and the second end of the second current limiting resistor is connected with the first end of the second switch.
In order to solve the technical problem, the utility model also provides a magnetic therapy apparatus which comprises the frequency control circuit.
The utility model provides a frequency control circuit which is applied to a magnetic therapy apparatus. In the scheme, an adjustable voltage stabilizing chip, a first resistor, N preset resistance values of second resistors, N switches and a processor are arranged, wherein the resistance values of the N second resistors are different, and N is an integer not less than 2. Because the output voltage of the adjustable voltage stabilization chip is related to the first resistor and the second resistor, the resistance value of the first resistor is fixed, the processor controls the sequential conduction of the N switches, and then the N second resistors with different resistance values are sequentially connected into the circuit. Therefore, the processor can enable the output end of the adjustable voltage stabilizing chip to obtain voltage signals with different frequencies by controlling the N switches to be sequentially conducted.
The utility model also provides a magnetic therapy apparatus which has the same beneficial effect as the frequency control circuit.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required in the prior art and the embodiments will be briefly described 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 to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a frequency control circuit according to the present invention;
FIG. 2 is a schematic diagram of another frequency control circuit according to the present invention;
fig. 3a is a waveform diagram of the output voltage at the output terminal of the adjustable voltage regulation chip according to the present invention;
FIG. 3b is a waveform diagram of the output voltage after passing through the H-bridge circuit according to the present invention;
FIG. 4 is a schematic structural diagram of an H-bridge circuit according to the present invention;
fig. 5 is a circuit diagram illustrating an H-bridge circuit controlled by a processor according to the present invention.
Detailed Description
The core of the utility model is to provide a frequency control circuit and a magnetic therapy apparatus, which can enable the output end of an adjustable voltage-stabilizing chip to obtain voltage signals with different frequencies.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a frequency control circuit according to the present invention.
A frequency control circuit for use in a magnetic therapy apparatus, the control circuit comprising:
the input end is connected with an adjustable voltage stabilizing chip 1 of direct current;
the first resistor 2 is connected in parallel between the output end and the control end of the adjustable voltage-stabilizing chip 1;
the first end of the second resistor 3 is respectively connected with the control end of the adjustable voltage stabilization chip 1, and the second resistor 3 has N preset resistance values;
the first ends of the N switches 4 are respectively connected with the second ends of the N second resistors 3, the second ends of the N switches 4 are all grounded, and the control ends of the N switches 4 are all connected with the processor 5;
the processor 5 is used for controlling the N switches 4 to be sequentially switched on based on a preset frequency so that the output end of the adjustable voltage stabilization chip 1 generates a voltage signal of a target frequency;
the N second resistors 3 have different resistances, and N is an integer not less than 2.
The magnetic therapeutic apparatus is an apparatus which utilizes magnetic field to act on human acupuncture points or affected parts to achieve the therapeutic purpose. The applicant considers that the coil in the magnetic therapeutic apparatus needs sine wave to generate magnetic field, and when the frequency and voltage of the sine wave are different, different magnetic fields can be generated, so that the magnetic therapeutic apparatus can achieve different therapeutic effects. In the prior art, the power grid voltage supplies power to the magnetic therapy instrument after rectification and transformation, the power grid voltage can obtain a low-voltage signal through a transformer, but the frequency of the power grid voltage cannot be changed.
In this embodiment, an adjustable voltage stabilization chip 1, a first resistor 2, N preset-resistance second resistors 3, N switches 4, and a processor 5 are provided, where the N second resistors 3 have different resistances, and N is an integer not less than 2. Because the output voltage of the adjustable voltage stabilizing chip 1 is related to the first resistor 2 and the second resistor 3, the resistance of the first resistor 2 is fixed, the processor 5 controls the sequential conduction of the N switches 4, and then the N second resistors 3 with different resistances are sequentially connected into the circuit.
In addition, the adjustable voltage regulation chip 1 is an LM338 chip, and when the resistance of the first resistor 2 is fixed, the voltage at the output terminal can be adjusted by changing the value of the second resistor 3.
Of course, the adjustable voltage regulation chip 1 is not limited to the LM338 chip, and the specific model of the adjustable voltage regulation chip 1 is not particularly limited in this application.
It should be noted that N is generally 8, that is, the second resistor 3 with 8 preset resistance values is generally set, and the switch 4 with 8 control terminals is connected to the processor 5.
Of course, N is not limited to 8, and the value of N may be set according to actual conditions, and the present application is not limited thereto.
In addition, the switch 4 is usually a photo coupler, but the switch 4 is not limited to the photo coupler, and the application is not limited thereto.
In addition, the processor 5 is usually a single chip microcomputer, but the processor 5 is not limited to the single chip microcomputer, and the application is not limited thereto.
In summary, the processor 5 controls the N switches 4 to be turned on sequentially, so that the output end of the adjustable voltage regulation chip 1 obtains voltage signals with different frequencies.
Referring to fig. 2, fig. 2 is a schematic structural diagram of another frequency control circuit provided in the present invention, in which 8 second resistors with preset resistance values and 8 switches with control terminals connected to a processor are taken as an example.
On the basis of the above-described embodiment:
as a preferred embodiment, the switch 4 is a photocoupler, the anode of the light emitting diode of the photocoupler is connected with the processor 5, the cathode of the light emitting diode is grounded, the collector electrodes of the phototriodes of the photocoupler are respectively connected with the second ends of the second resistors 3, and the emitter electrodes of the phototriodes are grounded;
wherein, the collector of the phototriode is used as the first end of the switch 4, the emitter of the phototriode is used as the second end of the switch 4, and the anode of the light emitting diode is used as the control end of the switch 4.
In the embodiment, a specific implementation manner of the switch 4 is given, that is, the switch 4 is a photocoupler. Specifically, when the anode of the light emitting diode of the photoelectric coupler receives the level signal sent by the processor 5, at this time, the light emitting diode emits light, the phototriode is conducted, and further, the photoelectric coupler is conducted, and the second resistor 3 connected with the photoelectric coupler is conducted.
As a preferred embodiment, further comprising:
the first end is connected with a power supply, and the second end is respectively connected with N pull-up resistors 6 which are respectively connected with the anodes of the light-emitting diodes of the N switches 4 in one-to-one correspondence.
In order to enable the photocoupler to be smoothly conducted when the processor 5 sends a level signal to the switches 4, in this embodiment, N pull-up resistors 6 are provided, a first end of which is connected to the power supply, and a second end of which is connected to anodes of the light emitting diodes of the N switches 4 in a one-to-one correspondence. Specifically, when the anode of the light emitting diode of the photoelectric coupler receives the level signal sent by the processor 5, the pull-up resistor 6 pulls up the voltage of the anode of the light emitting diode, at this time, the light emitting diode emits light, the phototriode is conducted, the photoelectric coupler is conducted, and the second resistor 3 connected with the photoelectric coupler is conducted.
The level signal is usually at a high level, but the level signal is not limited to a high level, and the present application is not limited thereto.
As a preferred embodiment, further comprising:
the transformer 7 is connected with a power supply of a power grid at the input end and connected with the rectifying module 8 at the output end and is used for reducing the voltage of the alternating current provided by the power grid;
and the output end of the rectification module 8 is connected with the input end of the adjustable voltage stabilization chip 1 and is used for converting the alternating current after voltage reduction into direct current.
Considering that the input end of the adjustable voltage stabilization chip 1 needs a certain value of dc voltage, in this embodiment, an input end is connected to a power supply of a power grid, a transformer 7 whose output end is connected to the rectification module 8, and a rectification module 8 whose output end is connected to the input end of the adjustable voltage stabilization chip 1 are provided. Specifically, the transformer 7 transforms the ac 220V grid power into a low voltage ac signal, which is rectified by the rectifier module 8 to form a dc power. It can be seen that this approach can provide a certain level of dc power to the input of the adjustable voltage regulation chip 1.
It should be noted that, after passing through the transformer 7 and the rectifier module 8, the ac 220V grid power supply generally forms about 29V dc, and inputs the dc to the input end of the adjustable voltage regulation chip 1.
Of course, the dc power passing through the transformer 7 and the rectifying module 8 is not limited to 29V dc power, and may be set according to actual conditions, and the present application is not limited thereto.
The manner of obtaining the dc power is not limited to passing through the transformer 7 and the rectifier module 8, and the present application is not limited thereto.
As a preferred embodiment, further comprising:
the first capacitor C1 has a first end connected with the input end of the adjustable voltage-stabilizing chip 1 and a second end grounded;
and/or a second capacitor C2 with a first end connected with the output end of the adjustable voltage stabilizing chip 1 and a second end grounded.
In order to filter the direct current at the input end of the adjustable voltage regulation chip 1, in the present embodiment, a first capacitor C1 is provided, a first end of which is connected to the input end of the adjustable voltage regulation chip 1, and a second end of which is grounded; similarly, in order to filter the current at the output end of the adjustable voltage regulation chip 1, a second capacitor C2 is provided, wherein the first end of the second capacitor is connected with the output end of the adjustable voltage regulation chip 1, and the second end of the second capacitor is grounded.
Referring to fig. 3a, fig. 3b and fig. 4, fig. 3a is a waveform diagram of an output voltage at an output terminal of the adjustable voltage stabilization chip according to the present invention, and fig. 3b is a waveform diagram of an output voltage after passing through an H-bridge circuit according to the present invention, wherein N switches in fig. 3a are sequentially turned on once to obtain a cycle, and abscissa of fig. 3a and fig. 3b are both time and ordinate is both voltage; FIG. 4 is a schematic structural diagram of an H-bridge circuit according to the present invention; fig. 5 is a circuit diagram illustrating an H-bridge circuit controlled by a processor according to the present invention.
As a preferred embodiment, the magnetic therapy apparatus comprises a coil;
the frequency control circuit further includes:
and the H-bridge circuit is used for obtaining a sine wave signal based on the voltage signal so that the coil can generate a magnetic field.
In order to convert the voltage signal at the output end of the adjustable voltage stabilization chip 1 into a sine wave signal, in this embodiment, an H-bridge circuit is provided, in which the input end is connected to the output end of the adjustable voltage stabilization chip 1 and the output end is connected to a coil, for obtaining the sine wave signal based on the voltage signal, and then the coil in the magnetic therapy apparatus can generate a magnetic field.
As a preferred embodiment, the H-bridge circuit comprises:
a first switch T1, the first end of which is connected with the output end of the adjustable voltage-stabilizing chip 1, the second end of which is connected with the first end of a third switch T3 and the second end of the coil, and the control end of which is connected with the processor 5;
a second switch T2, the first end of which is connected with the output end of the adjustable voltage-stabilizing chip 1, the second end of which is connected with the first end of the fourth switch T4 and the first end of the coil, and the control end of which is connected with the processor 5;
a third switch T3 having a second terminal connected to ground and a control terminal connected to the processor 5;
a fourth switch T4 having a second terminal connected to ground and a control terminal connected to the processor 5;
the processor 5 is also used for controlling the first switch T1, the second switch T2, the third switch T3 and the fourth switch T4 to be turned on or off.
In this embodiment, a specific implementation manner of the H-bridge circuit is given.
It should be noted that, here, the processor 5 controls the first switch T1, the second switch T2, the third switch T3, and the fourth switch T4 through a two-way optical coupling, where the PINs 20 and the PINs 21 are connected to the I/O port of the single chip microcomputer, when the I/O port and the PINs 20 of the single chip microcomputer are at a low level, the optical coupler conducting K1 is at a low level, and when the I/O port and the PINs 20 of the single chip microcomputer are at a high level, the optical coupler non-conducting K1 is at a high level. K1 is connected with the control ends of the first switch T1 and the third switch T3, and K2 is connected with the control ends of the second switch T2 and the fourth switch T4.
Of course, the manner in which the processor 5 controls the first switch T1, the second switch T2, the third switch T3 and the fourth switch T4 is not limited to this manner, and the present application is not limited thereto.
As a preferred embodiment, further comprising:
the first current limiting resistor R1 is connected with the output end of the adjustable voltage stabilizing chip 1 at the first end and connected with the first end of the first switch T1 at the second end;
and/or a second current limiting resistor R2, the first end of which is connected with the output end of the adjustable voltage stabilizing chip 1, and the second end of which is connected with the first end of a second switch T2.
In order to protect the first switch T1, the second switch T2, the third switch T3 and the fourth switch T4, in the present embodiment, a first current limiting resistor R1 having a first terminal connected to the output terminal of the adjustable voltage stabilization chip 1 and a second terminal connected to the first terminal of the first switch T1 is provided, and/or a second current limiting resistor R2 having a first terminal connected to the output terminal of the adjustable voltage stabilization chip 1 and a second terminal connected to the first terminal of the second switch T2 is provided. The current limiting function can be achieved, and the first switch T1, the second switch T2, the third switch T3 and the fourth switch T4 are prevented from being damaged due to the fact that the voltage of the output end of the adjustable voltage stabilizing chip 1 is too large.
The utility model also provides a magnetic therapy apparatus which comprises the frequency control circuit.
For the introduction of the magnetic therapy apparatus provided by the present invention, please refer to the embodiment of the utility model, which is not described herein again.
It is to be noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
Claims (9)
1. A frequency control circuit applied to a magnetic therapy apparatus is characterized by comprising:
the input end is connected with an adjustable voltage stabilizing chip of direct current;
the first resistor is connected between the output end and the control end of the adjustable voltage-stabilizing chip in parallel;
the first end of the second resistor is respectively connected with the control end of the adjustable voltage stabilizing chip;
the first ends of the N switches are respectively connected with the second ends of the N second resistors, the second ends of the N switches are all grounded, and the control ends of the N switches are all connected with the processor;
the processor is used for controlling the N switches to be sequentially switched on based on a preset frequency so that the output end of the adjustable voltage stabilizing chip can generate a voltage signal of a target frequency;
the resistance values of the N second resistors are different, and N is an integer not less than 2.
2. The frequency control circuit according to claim 1, wherein the switch is a photo coupler, an anode of a light emitting diode of the photo coupler is connected to the processor, a cathode of the light emitting diode is grounded, collectors of phototriodes of the photo coupler are respectively connected to the second ends of the second resistors, and an emitter of the phototriode is grounded;
the collector of the phototriode is used as the first end of the switch, the emitter of the phototriode is used as the second end of the switch, and the anode of the light-emitting diode is used as the control end of the switch.
3. The frequency control circuit of claim 2, further comprising:
the first end of the pull-up resistor is connected with the power supply, and the second end of the pull-up resistor is connected with the anodes of the N light-emitting diodes of the switches in a one-to-one correspondence mode.
4. The frequency control circuit of claim 1, further comprising:
the input end of the transformer is connected with a power supply of a power grid, and the output end of the transformer is connected with the rectification module and used for reducing the voltage of the alternating current provided by the power grid;
the output end of the rectifying module is connected with the input end of the adjustable voltage-stabilizing chip and is used for converting the alternating current after voltage reduction into the direct current.
5. The frequency control circuit of claim 1, further comprising:
the first capacitor is connected with the input end of the adjustable voltage stabilization chip at the first end and grounded at the second end;
and/or the first end of the second capacitor is connected with the output end of the adjustable voltage-stabilizing chip, and the second end of the second capacitor is grounded.
6. The frequency control circuit of any one of claims 1 to 5, wherein the magnetic therapy instrument comprises a coil;
the frequency control circuit further includes:
and the H-bridge circuit is used for obtaining a sine wave signal based on the voltage signal so that the coil can generate a magnetic field.
7. The frequency control circuit of claim 6, wherein the H-bridge circuit comprises:
the first switch is connected with the output end of the adjustable voltage-stabilizing chip at a first end, connected with a first end of a third switch and a second end of the coil at a second end, and connected with the processor at a control end;
the first end of the second switch is connected with the output end of the adjustable voltage stabilizing chip, the second end of the second switch is connected with the first end of the fourth switch and the first end of the coil, and the control end of the second switch is connected with the processor;
the third switch is connected with the second end of the second switch and the control end of the second switch is connected with the processor;
the fourth switch with a second end grounded and a control end connected with the processor;
the processor is further configured to control the first switch, the second switch, the third switch, and the fourth switch to be turned on or off.
8. The frequency control circuit of claim 7, further comprising:
the first current limiting resistor is connected with the output end of the adjustable voltage stabilizing chip at the first end and connected with the first end of the first switch at the second end;
and/or the first end of the second current limiting resistor is connected with the output end of the adjustable voltage stabilizing chip, and the second end of the second current limiting resistor is connected with the first end of the second switch.
9. A magnetic therapy apparatus comprising a frequency control circuit according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120028409.XU CN216703183U (en) | 2021-01-06 | 2021-01-06 | Frequency control circuit and magnetic therapy apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120028409.XU CN216703183U (en) | 2021-01-06 | 2021-01-06 | Frequency control circuit and magnetic therapy apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216703183U true CN216703183U (en) | 2022-06-10 |
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| CN202120028409.XU Active CN216703183U (en) | 2021-01-06 | 2021-01-06 | Frequency control circuit and magnetic therapy apparatus |
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| CN (1) | CN216703183U (en) |
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- 2021-01-06 CN CN202120028409.XU patent/CN216703183U/en active Active
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