CN216703178U - Low-frequency pulse output circuit and low-frequency pulse therapeutic instrument - Google Patents
Low-frequency pulse output circuit and low-frequency pulse therapeutic instrument Download PDFInfo
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- CN216703178U CN216703178U CN202120712688.1U CN202120712688U CN216703178U CN 216703178 U CN216703178 U CN 216703178U CN 202120712688 U CN202120712688 U CN 202120712688U CN 216703178 U CN216703178 U CN 216703178U
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Abstract
The application discloses a low-frequency pulse output circuit and a low-frequency pulse therapeutic apparatus, which comprise a controller, a filter circuit, a follower, a switch circuit, an amplifying circuit and a transformer; the controller is connected with the filter circuit and the switch circuit and is used for outputting the PWM signal to the filter circuit and outputting the low-frequency pulse signal to the switch circuit so as to enable the switch circuit to output the pulse signal with the frequency and the pulse width consistent with those of the low-frequency pulse signal by controlling the conduction state of the switch circuit; the filter circuit is also connected with the follower and used for converting the PWM signal into a direct current signal and outputting the direct current signal to the output end of the switching circuit through the follower so as to enable the switching circuit to output a pulse signal with positive correlation between the voltage and the duty ratio of the PWM signal; the amplifying circuit is connected with the switching circuit and used for amplifying the pulse signal output by the switching circuit and outputting the amplified signal to the transformer. The circuit has low cost and can greatly reduce the complexity of a program.
Description
Technical Field
The application relates to the technical field of electrotherapy, in particular to a low-frequency pulse output circuit; also relates to a low-frequency pulse therapeutic apparatus.
Background
Electrotherapy refers to a method for treating diseases by using different types of electric currents and electromagnetic fields, and mainly comprises direct current electrotherapy, direct current drug iontophoresis, low-frequency pulse electrotherapy, medium-frequency pulse electrotherapy, high-frequency electrotherapy and electrostatic therapy. Among them, the low frequency pulse electrotherapy is a method for treating diseases by using a low frequency pulse therapeutic apparatus to output low frequency pulses, and the intensity of the low frequency pulses is often required to be adjusted during the treatment process. However, the current common adjustment scheme of the low-frequency pulse intensity is to adjust the low-frequency pulse intensity through a single chip and a DA converter or through a single chip and a potentiometer, so that the cost is high, and the procedure is complex. Therefore, how to reduce the cost and the complexity of the process has become a technical problem to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The application aims to provide a low-frequency pulse output circuit which is low in cost and capable of greatly reducing program complexity. Another object of the present application is to provide a low frequency pulse therapeutic apparatus, which has the above technical effects.
In order to solve the above technical problem, the present application provides a low frequency pulse output circuit, including:
the circuit comprises a controller, a filter circuit, a follower, a switching circuit, an amplifying circuit and a transformer;
the controller is respectively connected with the input end of the filter circuit and the input end of the switch circuit; the output end of the filter circuit is connected with the input end of the follower, the output end of the follower is connected with the output end of the switch circuit, the output end of the switch circuit is also connected with the input end of the amplifying circuit, the output end of the amplifying circuit is connected with the primary coil of the transformer, and the secondary coil of the transformer is used as the output end of the low-frequency pulse output circuit;
the controller is used for outputting a PWM signal to the filter circuit and outputting a low-frequency pulse signal to the switch circuit so as to enable the switch circuit to output a pulse signal with the frequency and the pulse width consistent with those of the low-frequency pulse signal by controlling the conducting state of the switch circuit;
the filter circuit is used for converting the PWM signal into a direct current signal and outputting the direct current signal to the output end of the switch circuit through the follower so that the switch circuit outputs the pulse signal of which the voltage and the duty ratio of the PWM signal are in positive correlation;
the amplifying circuit is used for amplifying the pulse signal output by the switching circuit and outputting the amplified signal to the transformer.
Optionally, the filter circuit includes:
the circuit comprises a first resistor, a second resistor, a first capacitor and a second capacitor;
one end of the first resistor is used as the input end of the filter circuit to be connected with the controller, the other end of the first resistor is respectively connected with one end of the second resistor and one end of the first capacitor, the other end of the second resistor is connected with one end of the second capacitor and used as the output end of the filter circuit, and the other end of the first capacitor and the other end of the second capacitor are both grounded.
Optionally, the follower includes:
a first operational amplifier; the positive input end of the first operational amplifier is connected with the output end of the filter circuit, the negative input end of the first operational amplifier is connected with the output end of the first operational amplifier, and the output end of the first operational amplifier is used as the output end of the follower.
Optionally, the switching circuit includes:
the first switch tube and the second switch tube;
the first end of the first switch tube is used as the input end of the switch circuit to be connected with the controller, the second end of the first switch tube is grounded, the third end of the first switch tube is connected with the power supply and the first end of the second switch tube, the second end of the second switch tube is grounded, and the third end of the second switch tube is used as the output end of the switch circuit to be connected with the output end of the follower circuit and the input end of the amplifying circuit.
Optionally, the first switch tube and the second switch tube are both triodes; the first ends of the first switch tube and the second switch tube are bases of triodes, the second ends of the first switch tube and the second switch tube are emitting electrodes of the triodes, and the third ends of the first switch tube and the second switch tube are collecting electrodes of the triodes.
Optionally, the amplifying circuit includes:
a second operational amplifier and a triode;
the positive input end of the second operational amplifier is used as the input end of the amplifying circuit and is connected with the output end of the following circuit and the output end of the switching circuit, the negative input end of the second operational amplifier is connected with the power supply, the output end of the second operational amplifier is connected with the base electrode of the triode, the emitting electrode of the triode is grounded, the collector electrode of the triode is used as the output end of the amplifying circuit and is connected with one end of the primary coil of the transformer, and the other end of the primary coil of the transformer is connected with the power supply.
Optionally, the controller includes a first controller and a second controller; the first controller is connected with the filter circuit and used for outputting the PWM signal; the second controller is connected with the switch circuit and used for outputting the pulse signal.
Optionally, the first controller and the second controller are both single-chip microcomputers.
In order to solve the technical problem, the application further provides a low-frequency pulse therapeutic apparatus, which comprises the low-frequency pulse output circuit.
The application provides a low frequency pulse output circuit includes: the device comprises a controller, a filter circuit, a follower, a switching circuit, an amplifying circuit and a transformer; the controller is respectively connected with the input end of the filter circuit and the input end of the switch circuit; the output end of the filter circuit is connected with the input end of the follower, the output end of the follower is connected with the output end of the switch circuit, the output end of the switch circuit is also connected with the input end of the amplifying circuit, the output end of the amplifying circuit is connected with the primary coil of the transformer, and the secondary coil of the transformer is used as the output end of the low-frequency pulse output circuit; the controller is used for outputting a PWM signal to the filter circuit and outputting a low-frequency pulse signal to the switch circuit so as to enable the switch circuit to output a pulse signal with the frequency and the pulse width consistent with those of the low-frequency pulse signal by controlling the conducting state of the switch circuit; the filter circuit is used for converting the PWM signal into a direct current signal and outputting the direct current signal to the output end of the switch circuit through the follower so that the switch circuit outputs the pulse signal of which the voltage and the duty ratio of the PWM signal are in positive correlation; the amplifying circuit is used for amplifying the pulse signal output by the switching circuit and outputting the amplified signal to the transformer.
Therefore, compared with the technical scheme that the low-frequency pulse intensity is adjusted through the single chip microcomputer and the DA converter or the single chip microcomputer and the potentiometer, the low-frequency pulse output circuit adjusts the low-frequency pulse intensity through the processor, the filter circuit, the follower, the switch circuit, the amplifying circuit and the transformer, changes the duty ratio of the PWM signal, and can adjust the intensity of the low-frequency pulse, so that the cost is low, and the program complexity is greatly reduced.
The low-frequency pulse therapeutic apparatus provided by the application also has the technical effects.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, 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 application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic diagram of a low-frequency pulse output circuit according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of another low frequency pulse output circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic waveform diagram according to an embodiment of the present disclosure.
Detailed Description
The core of the application is to provide a low-frequency pulse output circuit, which is low in cost and capable of greatly reducing the complexity of a program. The other core of the application is to provide a low-frequency pulse therapeutic apparatus which also has the technical effects.
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. 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 application.
Referring to fig. 1, fig. 1 is a schematic diagram of a low-frequency pulse output circuit according to an embodiment of the present disclosure, and referring to fig. 1, the circuit mainly includes:
a controller 10, a filter circuit 20, a follower 30, a switching circuit 40, an amplification circuit 50, and a transformer 60;
the controller 10 is connected to the input terminal of the filter circuit 20 and the input terminal of the switch circuit 40, and is responsible for outputting the PWM signal to the filter circuit 20 and outputting the low frequency pulse signal to the switch circuit 40. In a specific embodiment, the controller 10 may include: a first controller and a second controller; the first controller is connected with the filter circuit 20 and is used for outputting a PWM signal; the second controller is connected to the switching circuit 40 for outputting the pulse signal. In addition, the first controller and the second controller can be both specifically single-chip microcomputers. As for the software implementation scheme for enabling the controller 10 to output the PWM signal and output the low-frequency pulse signal, reference may be made to the prior art, and details of this application are not repeated herein. That is, for the software part for implementing the technical solution, reference may be made to the existing software design, which is not the focus of the present application.
The input end of the filter circuit 20 is connected to the controller 10, and the output end of the filter circuit 20 is connected to the input end of the follower 30, and is responsible for converting the PWM signal output by the controller 10 into a dc signal and outputting the dc signal obtained by conversion to the follower 30.
Referring to fig. 2, in a specific embodiment, the filter circuit 20 may include: the circuit comprises a first resistor R1, a second resistor R2, a first capacitor C1 and a second capacitor C2; one end of the first resistor R1 is connected to the controller 10 as the input end of the filter circuit 20, the other end of the first resistor R1 is connected to one end of the second resistor R2 and one end of the first capacitor C1, the other end of the second resistor R2 is connected to one end of the second capacitor C2 and serves as the output end of the filter circuit 20, and the other end of the first capacitor C1 and the other end of the second capacitor C2 are both grounded.
The PWM signal output from the controller 10 is converted into a dc signal through a two-stage RC filter circuit 20 composed of a first resistor R1, a first capacitor C1, a second resistor R2, and a second capacitor C2.
The input end of the follower 30 is connected to the output end of the filter circuit 20, and the output end of the follower 30 is connected to the output end of the switch circuit 40, and is responsible for performing impedance transformation on the dc signal output by the filter circuit 20 and outputting the dc signal.
Referring to FIG. 2, in one particular embodiment, the follower 30 may include: a first operational amplifier IC 1; the positive input terminal of the first operational amplifier IC1 is connected to the output terminal of the filter circuit 20, the negative input terminal of the first operational amplifier IC1 is connected to the output terminal of the first operational amplifier IC1, and the output terminal of the first operational amplifier IC1 is used as the output terminal of the follower 30.
As shown in fig. 2, the output terminal of the follower 30 may be connected in series with a resistor and then connected to the output terminal of the switch circuit 40.
The input end of the switch circuit 40 is connected with the controller 10, and the output end of the switch circuit 40 is connected with the input end of the amplifying circuit 50. The controller 10 outputs a low-frequency pulse signal to the switching circuit 40, and controls the switching circuit 40 to be turned on and off, so that the switching circuit 40 outputs a pulse signal having a frequency and a pulse width that are consistent with those of the low-frequency pulse signal. In addition, the output end of the switching circuit 40 is connected to the output end of the follower 30, the voltage of the pulse signal output by the switching circuit 40 is positively correlated with the signal output by the follower 30, and the signal output by the follower 30 is positively correlated with the duty ratio of the PWM signal output by the controller 10, so that the voltage of the pulse signal output by the switching circuit 40 is positively correlated with the duty ratio of the PWM signal output by the controller 10, that is, the larger the duty ratio of the PWM signal is, the larger the voltage of the signal output by the switching circuit 40 is. Accordingly, the voltage level of the pulse signal output from the switching circuit 40 can be controlled by changing the duty ratio of the PWM signal.
Referring to fig. 2, in a specific embodiment, the switching circuit 40 may include: a first switch tube Q1 and a second switch tube Q2; a first terminal of the first switch Q1 is used as an input terminal of the switch circuit 40 to connect to the controller 10, a second terminal of the first switch Q1 is grounded, a third terminal of the first switch Q1 is connected to a power supply (VCC shown in the figure) and a first terminal of the second switch Q2, a second terminal of the second switch Q2 is grounded, and a third terminal of the second switch Q2 is used as an output terminal of the switch circuit 40 to connect to an output terminal of the follower circuit and an input terminal of the amplifier circuit 50.
In addition, the first switch tube Q1 and the second switch tube Q2 may be specifically triodes; the first ends of the first switch tube Q1 and the second switch tube Q2 are bases of the triodes, the second ends of the first switch tube Q1 and the second switch tube Q2 are emitters of the triodes, and the third ends of the first switch tube Q1 and the second switch tube Q2 are collectors of the triodes.
Therefore, when the controller 10 outputs a low level, the first switch Q1 is turned on, and the second switch Q2 is turned off; when the controller 10 outputs a high level, the first switch Q1 is turned off, and the second switch Q2 is turned on. The switching circuit 40 outputs a pulse signal having a frequency and a pulse width in accordance with the low-frequency pulse signal output from the controller 10.
Fig. 3 shows a waveform of the low frequency pulse signal output by the controller 10, a waveform of the signal at the base of the second switching tube Q2, i.e., a waveform of the signal at the collector of the first switching tube Q1, and a waveform of the signal at the collector of the second switching tube Q2, i.e., a waveform of the signal output by the switching circuit 40, where a waveform a shows a waveform of the low frequency pulse signal output by the controller 10, a waveform B shows a waveform of the signal at the base of the second switching tube Q2, i.e., a waveform of the signal at the collector of the first switching tube Q1, and a waveform C shows a waveform of the signal at the collector of the second switching tube Q2, i.e., a waveform of the signal output by the switching circuit 40.
Further, as shown in fig. 2, a base of the first switching tube Q1 may be connected in series with a resistor and then connected to the controller 10, a collector of the first switching tube Q1 may be connected in series with a resistor and then connected to the power supply, a base of the second switching tube Q2 may be connected in series with a resistor and then connected to a collector of the first switching tube Q1, and a base and an emitter of the second switching tube Q2 may be connected in parallel with a circuit.
The input end of the amplifying circuit 50 is connected with the output end of the switching circuit 40, the output end of the amplifying circuit 50 is connected with the primary coil of the transformer 60, and the secondary coil of the transformer 60 is used as the output end of the low-frequency pulse output circuit. The amplifying circuit 50 is responsible for amplifying the signal output by the switching circuit 40 through the amplifying circuit 50, and outputting the amplified signal to the transformer 60.
Referring to fig. 2, in a specific embodiment, the amplifying circuit 50 may include: a second operational amplifier IC2 and a transistor Q3; the positive input end of the second operational amplifier IC2 is used as the input end of the amplifying circuit 50 and is connected with the output end of the follower circuit and the output end of the switch circuit 40, the negative input end of the second operational amplifier IC2 is connected with a power supply (VCC shown in the figure), the output end of the second operational amplifier IC2 is connected with the base of the triode Q3, the emitter of the triode Q3 is grounded, the collector of the triode Q3 is used as the output end of the amplifying circuit 50 and is connected with one end of the primary coil of the transformer 60, and the other end of the primary coil of the transformer 60 is connected with the power supply (VCC-12V shown in the figure).
When the voltage of the pulse signal output by the switch circuit 40 is different, the current output by the corresponding second operational amplifier IC2 is different, and further the current of the collector of the triode Q3 is also different, so that the current of the collector of the triode Q3 can be changed by changing the duty ratio of the PWM pulse, and finally, the change of the low-frequency pulse intensity output by the low-frequency pulse circuit is realized, and the purpose of adjusting the low-frequency pulse intensity is achieved.
As shown in fig. 2, the positive input terminal of the second operational amplifier IC2 may be connected in series with a resistor and then connected to the output terminal of the switch resistor, the positive input terminal and the negative input terminal of the second operational amplifier IC2 may be connected in series with a resistor and then grounded, a resistor may be connected between the negative input terminal of the second operational amplifier IC2 and the emitter of the transistor Q3, and the emitter of the transistor Q3 may also be connected in series with a resistor and then grounded.
In summary, the low-frequency pulse output circuit provided by the application comprises a controller, a filter circuit, a follower, a switch circuit, an amplifying circuit and a transformer, wherein the low-frequency pulse intensity is adjusted through the processor, the filter circuit, the follower, the switch circuit, the amplifying circuit and the transformer, the duty ratio of the PWM signal is changed, and the low-frequency pulse intensity can be adjusted.
The application also provides a low-frequency pulse therapeutic apparatus which comprises the low-frequency pulse output circuit. For the low frequency pulse therapeutic apparatus, the description is omitted, and reference may be made to the embodiment of the low frequency pulse output circuit.
Because the situation is complicated and cannot be illustrated by a list, those skilled in the art can appreciate that there can be many examples in combination with the actual situation under the basic principle of the embodiments provided in the present application and that it is within the scope of the present application without sufficient inventive effort.
The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The low-frequency pulse output circuit and the low-frequency pulse therapeutic apparatus provided by the application are described in detail above. The principles and embodiments of the present application are described herein using specific examples, which are only used to help understand the method and its core idea of the present application. It should be noted that, for those skilled in the art, without departing from the principle of the present application, the present application can also make several improvements and modifications, and those improvements and modifications also fall into the protection scope of the claims of the present application.
It is further 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.
Claims (9)
1. A low frequency pulse output circuit, comprising:
the circuit comprises a controller, a filter circuit, a follower, a switching circuit, an amplifying circuit and a transformer;
the controller is respectively connected with the input end of the filter circuit and the input end of the switch circuit; the output end of the filter circuit is connected with the input end of the follower, the output end of the follower is connected with the output end of the switch circuit, the output end of the switch circuit is also connected with the input end of the amplifying circuit, the output end of the amplifying circuit is connected with the primary coil of the transformer, and the secondary coil of the transformer is used as the output end of the low-frequency pulse output circuit;
the controller is used for outputting a PWM signal to the filter circuit and outputting a low-frequency pulse signal to the switch circuit so as to enable the switch circuit to output a pulse signal with the frequency and the pulse width consistent with those of the low-frequency pulse signal by controlling the conducting state of the switch circuit;
the filter circuit is used for converting the PWM signal into a direct current signal and outputting the direct current signal to the output end of the switch circuit through the follower so that the switch circuit outputs the pulse signal of which the voltage and the duty ratio of the PWM signal are in positive correlation;
the amplifying circuit is used for amplifying the pulse signal output by the switching circuit and outputting the amplified signal to the transformer.
2. A low frequency pulse output circuit as claimed in claim 1, wherein said filter circuit comprises:
the circuit comprises a first resistor, a second resistor, a first capacitor and a second capacitor;
one end of the first resistor is used as the input end of the filter circuit to be connected with the controller, the other end of the first resistor is respectively connected with one end of the second resistor and one end of the first capacitor, the other end of the second resistor is connected with one end of the second capacitor and used as the output end of the filter circuit, and the other end of the first capacitor and the other end of the second capacitor are both grounded.
3. The low frequency pulse output circuit according to claim 1, wherein the follower includes:
a first operational amplifier; the positive input end of the first operational amplifier is connected with the output end of the filter circuit, the negative input end of the first operational amplifier is connected with the output end of the first operational amplifier, and the output end of the first operational amplifier is used as the output end of the follower.
4. A low frequency pulse output circuit as claimed in claim 1, wherein said switching circuit comprises:
the first switch tube and the second switch tube;
the first end of the first switch tube is used as the input end of the switch circuit to be connected with the controller, the second end of the first switch tube is grounded, the third end of the first switch tube is connected with the power supply and the first end of the second switch tube, the second end of the second switch tube is grounded, and the third end of the second switch tube is used as the output end of the switch circuit to be connected with the output end of the follower circuit and the input end of the amplifying circuit.
5. The low-frequency pulse output circuit according to claim 4, wherein the first switching tube and the second switching tube are both triodes; the first ends of the first switch tube and the second switch tube are bases of triodes, the second ends of the first switch tube and the second switch tube are emitting electrodes of the triodes, and the third ends of the first switch tube and the second switch tube are collecting electrodes of the triodes.
6. The low frequency pulse output circuit according to claim 1, wherein the amplification circuit comprises:
a second operational amplifier and a triode;
the positive input end of the second operational amplifier is used as the input end of the amplifying circuit and is connected with the output end of the follower circuit and the output end of the switch circuit, the negative input end of the second operational amplifier is connected with the power supply, the output end of the second operational amplifier is connected with the base electrode of the triode, the emitting electrode of the triode is grounded, the collector electrode of the triode is used as the output end of the amplifying circuit and is connected with one end of the primary coil of the transformer, and the other end of the primary coil of the transformer is connected with the power supply.
7. The low frequency pulse output circuit according to claim 1, wherein the controller includes a first controller and a second controller; the first controller is connected with the filter circuit and used for outputting the PWM signal; the second controller is connected with the switch circuit and used for outputting the pulse signal.
8. The low-frequency pulse output circuit according to claim 7, wherein the first controller and the second controller are both a single chip microcomputer.
9. A low frequency pulse treatment apparatus comprising a low frequency pulse output circuit as claimed in any one of claims 1 to 8.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120712688.1U CN216703178U (en) | 2021-04-08 | 2021-04-08 | Low-frequency pulse output circuit and low-frequency pulse therapeutic instrument |
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| CN202120712688.1U CN216703178U (en) | 2021-04-08 | 2021-04-08 | Low-frequency pulse output circuit and low-frequency pulse therapeutic instrument |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116440420A (en) * | 2023-05-30 | 2023-07-18 | 河南翔宇医疗设备股份有限公司 | Magnetic field intensity linear control method applied to laser magnetic field physiotherapy instrument |
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2021
- 2021-04-08 CN CN202120712688.1U patent/CN216703178U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116440420A (en) * | 2023-05-30 | 2023-07-18 | 河南翔宇医疗设备股份有限公司 | Magnetic field intensity linear control method applied to laser magnetic field physiotherapy instrument |
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