Hardware circuit of household variable-frequency electro-therapeutic apparatus

Abstract

The utility model relates to the technical field of medical electronics, in particular to a hardware circuit of a household variable-frequency electro-therapeutic apparatus. The hardware circuit comprises a frequency conversion signal generation circuit which is used for generating a square wave signal and then outputting the square wave signal; the pulse modulation circuit is connected with the frequency conversion signal generation circuit, receives the square wave signal, reduces the frequency of the square wave signal and outputs the square wave signal; the pulse output circuit is connected with the pulse modulation circuit, reduces the frequency output by the pulse modulation circuit, amplifies the rear wave signal and outputs a pulse signal; and the voltage stabilizing and filtering circuit is used for receiving the alternating current, rectifying and filtering the alternating current and then outputting direct current. According to the utility model, after an alternating current power supply is rectified, direct current is subjected to voltage stabilization and filtering processing through the voltage stabilization filter circuit. And the stable working voltage of the pulse generation and output circuit is ensured, so that the stable output of the household variable-frequency electro-therapeutic apparatus is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of medical electronics. Specifically, the utility model relates to a hardware circuit of a household variable-frequency electrotherapy instrument. Background Art

[0002] A variable-frequency electrotherapy instrument is an electrotherapy device that can adjust the output frequency and is usually used to treat pain, promote recovery or improve physiological functions. The variable-frequency electrotherapy instrument generates electromagnetic pulses by adjusting the frequency and intensity of the current. Pulses of different frequencies can be used for different treatment purposes. For example, low-frequency pulses are used for pain management, and high-frequency pulses are used to promote muscle contraction or enhance blood circulation.

[0003] A household variable-frequency electrotherapy instrument is usually used to apply electrotherapy signals of specific frequencies and intensities to the human body surface to achieve therapeutic or soothing effects. Since the therapeutic effect of the variable-frequency electrotherapy instrument directly depends on the precise control of the output current or voltage, such as parameters like the frequency and intensity of the electrical stimulation. Unstable input voltage may cause fluctuations or distortions in the output of the electrotherapy instrument, affecting the stability and reliability of the device. Therefore, these circuits have high requirements for the accuracy and stability of the input voltage. Even a very small change in the operating power supply voltage of the household electrotherapy instrument may have a significant impact on its output, thereby affecting the achievement of the therapeutic effect or soothing effect. Summary of the Utility Model

[0004] To solve the problem that even a very small change in the operating power supply voltage of the household variable-frequency electrotherapy instrument may have a significant impact on its output, the utility model proposes a hardware circuit of a household variable-frequency electrotherapy instrument.

[0005] For this purpose, the utility model provides a hardware circuit of a household variable-frequency electrotherapy instrument, which includes: a variable-frequency signal generation circuit for generating a square-wave signal and then outputting the square-wave signal; a pulse modulation circuit connected to the variable-frequency signal generation circuit and receiving the square-wave signal, the pulse modulation circuit reducing the frequency of the square-wave signal and then outputting it; a pulse output circuit connected to the pulse modulation circuit and amplifying the square-wave signal with reduced frequency output by the pulse modulation circuit to output a pulse signal; a voltage stabilization and filtering circuit for receiving alternating current and rectifying and filtering the alternating current to output direct current. The voltage stabilization and filtering circuit includes a bridge rectifier BR, a first voltage regulator IC1, and a second voltage regulator LM. The bridge rectifier BR is connected to the first voltage regulator IC1, the first voltage regulator IC1 is connected to the second voltage regulator LM, and the second voltage regulator LM outputs direct current to the variable-frequency signal generation circuit, the pulse modulation circuit, and the pulse modulation circuit.

[0006] In one embodiment, the variable-frequency signal generating circuit includes an oscillator IC2, and the oscillator IC2 is connected to the pulse modulation circuit. The oscillator IC2 transmits the square-wave signal it generates to the pulse modulation circuit.

[0007] In one embodiment, the pulse modulation circuit includes a counter-divider IC3. The counter-divider IC3 includes ten output terminals, and each output terminal is connected to the pulse output circuit through a diode and a resistor.

[0008] In one embodiment, the pulse output circuit includes a monostable flip-flop IC4, a detection circuit, and an amplification circuit. The monostable flip-flop IC4 receives the output signal of the counter-divider IC3 and outputs a pulse signal. The amplification circuit amplifies the pulse signal and outputs it. The detection circuit detects the voltage of the amplified pulse signal.

[0009] In one embodiment, the amplification circuit includes a second triode Q2, a third triode Q3, and a pulse transformer T. The base of the second triode Q2 receives the pulse signal output by the monostable flip-flop IC4. The collector of the second triode Q2 is connected to the base of the third triode Q3. The emitters of the second triode Q2 and the third triode Q3 are both connected to one end of the primary side of the pulse transformer T. The other end of the primary side of the pulse transformer T is grounded. Pulse signals are output at both ends of the secondary side of the pulse transformer T.

[0010] In one embodiment, the detection circuit includes a coil L2, a light-emitting diode D7, an eighth diode Q8, and a first triode Q1. The coil L2 collects the output voltage of the pulse transformer T through electromagnetic induction. One end of the coil is grounded through a resistor. The other end of the coil L2 is connected to the base of the first triode Q1 through the eighth diode Q8. The emitter of the first triode Q1 is grounded. The collector of the first triode Q1 receives direct current through the light-emitting diode D7. Wherein, the anode of the eighth diode Q8 is connected to the coil L2, and the cathode of the light-emitting diode D7 is connected to the collector of the first triode Q1.

[0011] In one embodiment, the rectifying and filtering circuit further includes a Schottky diode D10 and a low-pass filter. The low-pass filter includes an inductor L1 and a fifth capacitor C5. The first voltage regulator IC1 is connected to the second voltage regulator LM through an inductor L. One end of the inductor L1 connected to the first voltage regulator IC1 is grounded through the Schottky diode D10. One end of the inductor L1 connected to the second voltage regulator LM is grounded through the fifth capacitor C5.

[0012] In one embodiment, the second voltage regulator LM is an LM117S chip.

[0013] In one embodiment, the output terminal of the second voltage regulator LM is grounded through a sixth capacitor C6 and a seventh capacitor C7 connected in parallel.

[0014] In one embodiment, the hardware circuit of a household frequency conversion electrotherapy instrument further includes a 220V AC power supply, and the 220V AC power supply is used to output 220V alternating current to the voltage stabilization and filtering circuit.

[0015] The beneficial effects of the present utility model are as follows:

[0016] After rectifying the AC power supply, the present utility model performs voltage stabilization and filtering processing on the direct current through a voltage stabilization and filtering circuit. The voltage stabilization and filtering circuit includes a pre-stage voltage regulator (the first voltage regulator) and a post-stage voltage regulator (the second voltage regulator) connected in series. The pre-stage voltage regulator is used to eliminate most of the fluctuations of the direct current, and the second voltage regulator further finely adjusts the direct current to ensure that the output direct current voltage is within an accurate set range. This ensures the stability of the working voltage of the pulse generation and output circuit, thereby ensuring the stable output of the household frequency conversion electrotherapy instrument. Description of the Drawings

[0017] By referring to the following detailed description with reference to the drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present utility model will become readily understood. In the drawings, several embodiments of the present utility model are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0018] Figure 1 is a schematic block diagram showing the structure of the hardware circuit of a household frequency conversion electrotherapy instrument according to an embodiment of the present utility model;

[0019] Figure 2 is a schematic circuit diagram showing the hardware circuit of a household frequency conversion electrotherapy instrument according to an embodiment of the present utility model. Detailed Embodiments

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0021] Next, the detailed embodiments of the present utility model will be described in detail with reference to the drawings.

[0022] Figure 1 It is a block diagram schematically showing the hardware circuit of a household variable-frequency electrotherapy instrument according to an embodiment of the present invention.

[0023] As Figure 1 shown, the hardware circuit of a household variable-frequency electrotherapy instrument includes a variable-frequency signal generation circuit, a pulse modulation circuit, a pulse output circuit, and a voltage stabilization and filtering circuit.

[0024] Among them, the variable-frequency signal generation circuit is used to generate a square wave signal and then output the square wave signal; the pulse modulation circuit is connected to the variable-frequency signal generation circuit and receives the square wave signal. The pulse modulation circuit reduces the frequency of the square wave signal and then outputs it; the pulse output circuit is connected to the pulse modulation circuit, and amplifies the square wave signal with a reduced frequency output by the pulse modulation circuit and then outputs a pulse signal; the voltage stabilization and filtering circuit is used to receive alternating current and rectify and filter the alternating current to output direct current. The voltage stabilization and filtering circuit includes a bridge rectifier BR, a first voltage regulator IC1, and a second voltage regulator LM. The bridge rectifier BR is connected to the first voltage regulator IC1, the first voltage regulator IC1 is connected to the second voltage regulator LM, and the second voltage regulator LM outputs direct current to the variable-frequency signal generation circuit, the pulse modulation circuit, and the pulse modulation circuit.

[0025] Further, the hardware circuit of a household variable-frequency electrotherapy instrument further includes a 220V AC power supply, and the 220V AC power supply is used to output 220V alternating current to the voltage stabilization and filtering circuit.

[0026] Figure 2 It is a circuit schematic diagram schematically showing the hardware circuit of a household variable-frequency electrotherapy instrument according to an embodiment of the present invention.

[0027] In one embodiment, the rectifier BR is a TB310S chip, the first voltage regulator is an LM2596 chip, and the second voltage regulator LM is an LM117S chip. The rectification and filtering circuit further includes a Schottky diode D10 and a low-pass filter. The low-pass filter includes an inductor L1 and a fifth capacitor C5. The first voltage regulator IC1 is connected to the second voltage regulator LM through an inductor L. One end of the inductor L1 connected to the first voltage regulator IC1 is grounded through the Schottky diode D10, and one end of the inductor L1 connected to the second voltage regulator LM is grounded through the fifth capacitor C5. The output end of the second voltage regulator LM is grounded through a sixth capacitor C6 and a seventh capacitor C7 connected in parallel.

[0028] Among them, the Schottky diode D10 is used for reverse voltage protection to prevent the second voltage regulator LM and the first voltage regulator IC1 from being damaged by reverse voltage and high voltage peaks. The low-pass filter is used to filter out high-frequency noise and fluctuations in the voltage output from the first voltage regulator IC1 to ensure a stable DC power supply. The fifth capacitor C5, the sixth capacitor C6, and the seventh capacitor C7 are used to filter the direct current output by the second voltage regulator LM to make the second voltage regulator LM stably output voltage.

[0029] It should be noted that more stable voltage output is achieved by cascading the LM2596 chip and the LM117S chip, so as to better meet the requirements of the frequency conversion signal generation circuit, pulse modulation circuit, and pulse output circuit for stable voltage.

[0030] In one embodiment, the frequency conversion signal generation circuit includes an oscillator IC2, and the oscillator IC2 is connected to the pulse modulation circuit. The oscillator IC2 transmits the square wave signal generated by it to the pulse modulation circuit.

[0031] Among them, the oscillator IC2 is an NE555 chip configured as a multivibrator. At this time, the NE555 chip is used to generate a periodic square wave, and the frequency of this square wave is adjustable.

[0032] In one embodiment, the pulse modulation circuit includes a counting frequency divider IC3. The counting frequency divider IC3 includes ten output terminals, and each output terminal is connected to the pulse output circuit through a diode and a resistor. Among them, the counting frequency divider IC3 is a CD4017 type chip. The CD4017 chip is an integrated circuit belonging to the CMOS logic family. The CD4017 chip can perform decimal counting on the input clock pulse and output the counting result through one of the ten output pins.

[0033] In one embodiment, the pulse output circuit includes a monostable flip-flop IC4, a detection circuit, and an amplification circuit. The monostable flip-flop IC4 receives the output signal of the counting frequency divider IC3 and outputs a pulse signal. The amplification circuit amplifies the pulse signal and outputs it. The detection circuit detects the voltage of the amplified pulse signal.

[0034] Among them, the monostable flip-flop IC4 is an NE555 chip configured in the monostable flip-flop mode. In this mode, the NE555 chip outputs a pulse with a fixed duration each time it is triggered, and then returns to the stable state and waits for the next trigger.

[0035] Furthermore, the amplifying circuit includes a second triode Q2, a third triode Q3, and a pulse transformer T. The base of the second triode Q2 receives the pulse signal output by the monostable flip-flop IC4. The collector of the second triode Q2 is connected to the base of the third triode Q3. The emitters of the second triode Q2 and the third triode Q3 are both connected to one end of the primary side of the pulse transformer T. The other end of the primary side of the pulse transformer T is grounded. Pulses are output at both ends of the secondary side of the pulse transformer T.

[0036] Furthermore, the detection circuit includes a coil L2, a light-emitting diode D7, an eighth diode Q8, and a first triode Q1. The coil L2 collects the output voltage of the pulse transformer T through electromagnetic induction. One end of the coil is grounded through a resistor. The other end of the coil L2 is connected to the base of the first triode Q1 through the eighth diode Q8. The emitter of the first triode Q1 is grounded. The collector of the first triode Q1 receives direct current through the light-emitting diode D7. Among them, the anode of the eighth diode Q8 is connected to the coil L2, and the cathode of the light-emitting diode D7 is connected to the collector of the first triode Q1.

[0037] In the above description of this specification, unless otherwise clearly specified and defined, terms such as "fixed", "installed", "connected" or "coupled" should be understood in a broad sense. For example, for the term "connected", it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, or it can be the internal connection of two components or the interaction relationship between two components. Therefore, unless clearly defined otherwise in this specification, those skilled in the art can understand the specific meaning of the above terms in this utility model according to specific circumstances.

[0038] The terms "first" or "second" etc. used in this specification to refer to numbers or ordinals are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this specification, "a plurality of" means at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0039] Although this specification has shown and described multiple embodiments of the present utility model, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Those skilled in the art will think of many changes, alterations, and alternative ways without departing from the spirit and idea of the present utility model. It should be understood that various alternative solutions to the embodiments of the present utility model described herein may be adopted in the practice of the present utility model.

Claims

1. A household frequency conversion electrotherapy apparatus, characterized in that, Comprising: A variable-frequency signal generating circuit, which is used to generate a square-wave signal and then output the square-wave signal; A pulse modulation circuit, which is connected to the variable-frequency signal generating circuit and receives the square-wave signal. The pulse modulation circuit reduces the frequency of the square-wave signal and then outputs it; A pulse output circuit, which is connected to the pulse modulation circuit and amplifies the square-wave signal with reduced frequency output by the pulse modulation circuit and then outputs a pulse signal; A voltage stabilizing and filtering circuit, which is used to receive alternating current, rectify and filter the alternating current and then output direct current. The voltage stabilizing and filtering circuit includes a bridge rectifier (BR), a first voltage regulator (IC1) and a second voltage regulator (LM). The bridge rectifier (BR) is connected to the first voltage regulator (IC1), the first voltage regulator (IC1) is connected to the second voltage regulator (LM), and the second voltage regulator (LM) outputs direct current to the variable-frequency signal generating circuit, the pulse modulation circuit and the pulse modulation circuit.

2. The household frequency conversion electrotherapy apparatus according to claim 1, wherein The variable-frequency signal generating circuit includes an oscillator (IC2), the oscillator (IC2) is connected to the pulse modulation circuit, and the oscillator (IC2) transmits the generated square-wave signal to the pulse modulation circuit.

3. The household type variable frequency electrotherapy apparatus according to claim 2, characterized in that, The pulse modulation circuit includes a counter-frequency divider (IC3), the counter-frequency divider (IC3) includes ten output terminals, and each output terminal is connected to the pulse output circuit through a diode and a resistor.

4. A household variable-frequency electrotherapy apparatus according to claim 3, characterized in that, The pulse output circuit includes a monostable flip-flop (IC4), a detection circuit and an amplification circuit. The monostable flip-flop (IC4) receives the output signal of the counter-frequency divider (IC3) and outputs a pulse signal. The amplification circuit amplifies the pulse signal and then outputs it. The detection circuit detects the voltage of the amplified pulse signal.

5. A household frequency conversion electrotherapy apparatus according to claim 3, characterized in that, The amplification circuit includes a second triode (Q2), a third triode (Q3) and a pulse transformer (T). The base of the second triode (Q2) receives the pulse signal output by the monostable flip-flop (IC4). The collector of the second triode (Q2) is connected to the base of the third triode (Q3). The emitters of the second triode (Q2) and the third triode (Q3) are both connected to one end of the primary side of the pulse transformer (T). The other end of the primary side of the pulse transformer (T) is grounded. Pulse signals are output at both ends of the secondary side of the pulse transformer (T).

6. The household frequency conversion electrotherapy apparatus according to claim 3, wherein, The detection circuit includes a coil (L2), a light-emitting diode (D7), an eighth diode (Q8), and a first triode (Q1). The coil (L2) collects the output voltage of the pulse transformer (T) through electromagnetic induction. One end of the coil is grounded through a resistor, and the other end of the coil (L2) is connected to the base of the first triode (Q1) through the eighth diode (Q8). The emitter of the first triode (Q1) is grounded, and the collector of the first triode (Q1) receives direct current through the light-emitting diode (D7). Among them, the anode of the eighth diode (Q8) is connected to the coil (L2), and the cathode of the light-emitting diode (D7) is connected to the collector of the first triode (Q1).

7. A household frequency conversion electrotherapy apparatus according to claim 1, characterized in that, The rectifying and filtering circuit further includes a Schottky diode (D10) and a low-pass filter. The low-pass filter includes an inductor (L1) and a fifth capacitor (C5). The first voltage regulator (IC1) is connected to the second voltage regulator (LM) through an inductor (L). One end of the inductor (L1) connected to the first voltage regulator (IC1) is grounded through the Schottky diode (D10), and one end of the inductor (L1) connected to the second voltage regulator (LM) is grounded through the fifth capacitor (C5).

8. A household frequency conversion electrotherapy apparatus according to claim 1, characterized in that, The second voltage regulator (LM) is an LM117S chip.

9. The household variable-frequency electrotherapy apparatus according to claim 1, characterized in that, The output terminal of the second voltage regulator (LM) is grounded through a sixth capacitor (C6) and a seventh capacitor (C7) connected in parallel.

10. A household frequency conversion electrotherapy apparatus according to any one of claims 1-9, characterized in that, It further includes a 220V AC power supply, and the 220V AC power supply is used to output 220V alternating current to the voltage stabilizing and filtering circuit.

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