CN115804908A - Electrotherapy steps up and adjusting circuit and electrotherapy equipment thereof - Google Patents
Electrotherapy steps up and adjusting circuit and electrotherapy equipment thereof Download PDFInfo
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- CN115804908A CN115804908A CN202111086775.1A CN202111086775A CN115804908A CN 115804908 A CN115804908 A CN 115804908A CN 202111086775 A CN202111086775 A CN 202111086775A CN 115804908 A CN115804908 A CN 115804908A
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Abstract
The invention provides an electrotherapy boosting and adjusting circuit and electrotherapy equipment thereof, which comprises a processor, a boosting circuit, a voltage doubling circuit and a voltage sampling circuit which are connected in sequence, wherein the voltage sampling circuit is also connected with the processor, wherein: the processor is used for outputting an enabling control signal; the booster circuit is used for amplifying a power supply input voltage into a first output voltage; the voltage doubling circuit is used for generating a second output voltage, and the second output voltage is N times of the first output voltage; the voltage sampling circuit is used for providing a feedback voltage to the booster circuit to limit the second output voltage. The electrotherapy boosting and adjusting circuit and the electrotherapy equipment thereof are added with the capacitance voltage doubling circuit on the basis of the boosting circuit, thereby realizing higher boosting ratio; the circuit is safe, and the chip has the highest voltage limit; the control is simple, and only the time of the enabling pin of the boost chip needs to be controlled and the analog-to-digital conversion circuit of the processor needs to adopt feedback voltage; the whole circuit system is closed-loop control, and the output voltage is stable.
Description
Technical Field
The invention belongs to the field of electrotherapy equipment in physical therapy equipment, in particular to the field of low-intermediate frequency therapy equipment, and relates to an electrotherapy voltage boosting and adjusting circuit and electrotherapy equipment thereof.
Background
Electrotherapy is a method of treating disease using different types of electrical and electromagnetic fields. Mainly comprises direct current electrotherapy, low frequency pulse electrotherapy, intermediate frequency pulse electrotherapy and high frequency electrotherapy. Based on the realization that the electrical stimulation therapy needs voltage, the pulse voltage of general electrotherapy equipment is about 50V-100V because the skin impedance of a human body is more than 1K omega; the output voltage of the conventional button battery (CR 2032) is 3V; only a booster circuit is used from 3V to 50V to 100V or more. Because the skin impedance is not consistent with the environment and the skin impedance of different people is not consistent, in order to ensure the consistent effect of the electrotherapy equipment, the high voltage of the electrotherapy equipment needs to be adjusted.
The existing electrotherapy voltage boosting circuit has the problems of limited voltage boosting ratio, low circuit safety, complex control, non-adjustable output voltage and the like, so how to provide the voltage boosting circuit and the electrotherapy equipment which can meet the voltage requirement, have safe circuits, simple control and adjustable output voltage becomes an important technical problem to be solved urgently by the technical personnel in the field.
Disclosure of Invention
In view of the above disadvantages of the prior art, an object of the present invention is to provide an electrotherapy voltage boosting and adjusting circuit and an electrotherapy apparatus, which are used to solve the problems of limited boosting ratio, low circuit safety, complex control and non-adjustable output voltage of the prior art electrotherapy voltage boosting circuit.
In order to achieve the above and other related objects, the present invention provides an electrotherapy voltage boosting and adjusting circuit, including a processor, a voltage boosting circuit, a voltage doubling circuit and a voltage sampling circuit connected in sequence, wherein the voltage sampling circuit is further connected to the processor, wherein:
the processor is used for outputting an enable control signal to the booster circuit and acquiring the feedback voltage of the voltage sampling circuit;
the booster circuit is used for amplifying a power supply input voltage into a first output voltage;
the voltage doubling circuit is used for generating a second output voltage, the second output voltage is N times of the first output voltage, and N is an integer greater than 1;
the voltage sampling circuit is used for dividing the second output voltage to output the feedback voltage.
Optionally, the boost circuit includes a boost chip, an inductor, a unidirectional boost diode, a first energy storage capacitor, and a second energy storage capacitor; the boost chip comprises an enable end, a voltage input end, a switch output end, a feedback end and a grounding end; one end of the inductor is connected with a power supply input voltage and the voltage input end, and the other end of the inductor is connected with the switch output end and the input end of the one-way booster diode; one end of the first energy storage capacitor is connected with a power supply input voltage, and the other end of the first energy storage capacitor is grounded; one end of the second energy storage capacitor is connected with the output end of the unidirectional boost diode, and the other end of the second energy storage capacitor is grounded; the enabling end and the feedback end are connected with the processor.
Optionally, the voltage doubling circuit comprises a double voltage doubling circuit.
Optionally, the voltage doubling circuit includes a first voltage doubling capacitor, a second voltage doubling capacitor, a third voltage doubling capacitor, a fourth voltage doubling capacitor, a first voltage doubling diode, a second voltage doubling diode, a third voltage doubling diode, and a fourth voltage doubling diode; one end of the first voltage-multiplying capacitor is connected with the input end of the unidirectional booster diode, and the other end of the first voltage-multiplying capacitor is connected with the output end of the first voltage-multiplying diode; one end of the second voltage-multiplying capacitor is connected with the output end of the first voltage-multiplying diode and the input end of the second voltage-multiplying diode, and the other end of the second voltage-multiplying capacitor is connected with the output end of the third voltage-multiplying diode and the input end of the fourth voltage-multiplying diode; one end of the third voltage doubling capacitor is connected with the input end of the unidirectional booster diode and the input end of the first voltage doubling diode, and the other end of the third voltage doubling capacitor is connected with the output end of the second voltage doubling diode and the input end of the third voltage doubling diode; one end of the fourth voltage doubling capacitor is connected with the input end of the third voltage doubling diode, and the other end of the fourth voltage doubling capacitor is connected with the output end of the fourth voltage doubling diode.
Optionally, the voltage sampling circuit includes a first sampling resistor and a second sampling resistor; one end of the first sampling resistor is connected with the output end of the voltage doubling circuit, and the other end of the first sampling resistor is connected with the processor and grounded through the second sampling resistor.
Optionally, the electrotherapy voltage boosting and adjusting circuit further comprises an output end energy storage capacitor, one end of the output end energy storage capacitor is connected with the output end of the voltage doubling circuit, and the other end of the output end energy storage capacitor is grounded.
Optionally, the processor includes an analog-to-digital conversion circuit, the analog-to-digital conversion circuit is connected to the voltage feedback circuit to obtain the feedback voltage and convert the feedback voltage into a digital signal, and the analog-to-digital conversion circuit is connected to the feedback end of the voltage boost circuit.
Optionally, the electrotherapy voltage boosting and adjusting circuit controls the second output voltage by controlling an enable time of the voltage boosting circuit.
Optionally, when the feedback voltage reaches a preset value, the processor stops outputting the enable control signal.
The present invention also provides an electrotherapy apparatus including an electrotherapy voltage boosting and adjusting circuit according to any one of the above.
As described above, the electrotherapy boosting and adjusting circuit and the electrotherapy device thereof of the invention are added with the capacitance voltage doubling circuit on the basis of the boosting circuit, thereby realizing higher boosting ratio; the circuit is safe, and the chip has the highest voltage limit; the control is simple, and only the time of the enabling pin of the boost chip needs to be controlled and the analog-to-digital conversion circuit of the processor needs to adopt feedback voltage; the whole circuit system is closed-loop control, and the output voltage is stable.
Drawings
Fig. 1 shows a boost circuit topology.
Fig. 2 shows the simplified circuit diagram of fig. 1 during charging.
Fig. 3 shows the simplified circuit diagram of fig. 1 during discharge.
Fig. 4 shows a chip-like solution for a boost circuit.
Fig. 5 shows a boost circuit implemented with discrete components.
Fig. 6a shows a voltage doubler circuit.
Fig. 6b shows a graph of the voltage waveform of the ac power supply of fig. 6 a.
Fig. 7 shows a boosting circuit added with a one-stage voltage doubling circuit.
FIG. 8 is a schematic block diagram of the electrotherapy voltage boost and regulation circuit of the present invention.
FIG. 9 is a circuit diagram showing an example of the electrotherapy voltage boosting and adjusting circuit of the present invention.
Description of the element reference
1. Processor with a memory having a plurality of memory cells
2. Voltage booster circuit
3. Voltage doubling circuit
4. Voltage sampling circuit
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Referring to fig. 1 to 9, it should be noted that the drawings provided in the present embodiment are only schematic illustrations of the basic idea of the present invention, and only the components related to the present invention are shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, number and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.
The booster circuit can be realized by a Pulse Width Modulation (PWM) control switch tube; a boost circuit topology structure is shown in fig. 1, and mainly comprises an inductor L1, a switching tube Q1, and a diode D1. The working process can be divided into two parts of charging and discharging. During charging, the switching tube Q1 is turned on, which means that the MOS transistor is equivalent to a line directly connecting the drain electrode and the source electrode, at this time, fig. 1 can be simplified to a circuit diagram shown in fig. 2, at this time, an input voltage flows through the inductor L1, the switching tube Q1 and the capacitor C1, and current on the inductor linearly increases along with continuous charging, and when the inductor reaches a certain time, a certain amount of energy is stored in the inductor; in the process, the diode D1 is reversely biased to be turned off, and the capacitor C2 supplies energy to the load to maintain the load to work. In the discharging process, when the switching tube is not turned on, the switching tube Q1 is turned off, and at this time, fig. 1 can be simplified into the circuit diagram shown in fig. 3, and since the inductor has a back electromotive force effect, the current of the inductor cannot change suddenly instantaneously but gradually discharges slowly. Because the original electric loop is disconnected, the inductor can only discharge through the loop of the diode D1, the load and the capacitor C1, namely, the inductor starts to charge the capacitor C2, and the voltage is provided by the capacitor C2 before the capacitor C2 is charged, so that the voltage at two ends of the capacitor is increased. The output capacitor C2 is typically large enough to maintain a constant current at the output to ensure discharge, while the diode is typically at least a fast recovery diode.
Fig. 4 shows a chip-type scheme of the boost circuit, in which the output voltage Vout = Vfb (R1 + R2)/R2, where U1 is a conventional boost chip, and R1 and R2 are sampling resistors; if the feedback voltage Vfb is smaller than the reference voltage, increasing PWM wave pulse width control switch tubes, and rapidly boosting the voltage through an inductor L1 and a diode D1; if Vfb is greater than or equal to the reference voltage, the PWM wave is stopped. The benefits of this scheme are: (1) The design is simple, only the design needs to be referred to a corresponding chip manual, and the scheme is mature and stable; the processor is simple to control and only needs to control the EN pin; (3) The circuit is safe, and an overcurrent protection circuit is arranged in the chip; (4) The selectable degree is wide, and the conventional boost chip on the market can be realized. The disadvantages of this solution are: (1) The boost ratio is limited, and the maximum boost ratio can only be up to 10 times of input voltage; (2) The voltage cannot be adjusted by the processor and only a fixed voltage can be output.
FIG. 5 shows another boost circuit implemented with discrete components, where PWM is generated by the processor and FB is fed back to the internal AD samples of the processor; and adjusting the pulse width of the PWM wave according to the feedback data of the FB to finally achieve the purpose of boosting. The benefits of this approach are: (1) The cost is low, only a part of passive devices are needed, and the core control is realized by the processor; (2) The output voltage can be adjusted, the PWM pulse width is adjusted according to the feedback of the FB pin, and finally the output voltage is adjusted. The disadvantages of this solution are: (1) The processor is complex to control and needs to realize the control of the booster circuit; (2) no overcurrent protection is provided, and the overcurrent protection of the switching tube Q1 is lacked; (3) The program control safety cannot be guaranteed, and if the program flies, the high-voltage output voltage cannot be guaranteed; (4) The step-up ratio is limited and can only be up to 10 times the input voltage.
Therefore, based on the characteristics of the two circuits, the booster circuit which can meet the voltage requirement, has safe circuit and simple control and can adjust the output voltage is very necessary.
The invention adds a direct current voltage doubling circuit on the basis of a conventional boosting chip to realize that the input voltage of a power supply (such as the voltage of a battery is 3V) is boosted to the voltage of 50V-100V. The output of the voltage is adjusted by controlling the time of an enable end EN (used for receiving an enable control signal SHDN output by a processor) of the boost chip, and the feedback of the boosted voltage is obtained by an analog-to-digital conversion circuit ADC of the processor (such as a singlechip).
Specifically, the voltage doubling circuit is a circuit for doubling the ac voltage to a higher voltage by using the energy storage of a capacitor and the unidirectional conduction characteristic of a diode. Fig. 6a shows a voltage doubler circuit that can boost the input voltage by 2, 3 or even higher times the voltage peak UI by different number of stages of capacitor and diode combinations. The capacitive voltage doubling circuit has the advantage that no matter how many times the UI is finally increased, no over-high impact voltage can be generated on an input power supply, so that a power supply with higher output voltage can be designed by adopting a low-voltage chip. Fig. 6b is a graph showing voltage waveforms of the ac power source in fig. 6 a.
If an alternating current source is designed, the alternating current source can be connected to a charge pump to carry out voltage doubling. In the circuit shown in fig. 3, the switch node SW is an ac source, so that a voltage doubling circuit can be added to realize a voltage output of 2 Vo. The complete circuit is shown in fig. 7, where diodes and capacitors are common devices.
It should be noted that, in the voltage doubling circuit, only the capacitor is used as an energy storage and filtering device, so that the voltage doubling circuit is suitable for the design of a low-power supply.
Referring to fig. 8, a schematic block diagram of an electrotherapy voltage boosting and adjusting circuit of the present invention is shown, which includes a processor 1, a voltage boosting circuit 2, a voltage doubling circuit 3, and a voltage sampling circuit 4 connected in sequence, wherein the voltage sampling circuit is further connected to the processor to implement closed-loop control, wherein: the processor 1 is configured to output an enable control signal to the voltage boost circuit 2 and obtain a feedback voltage of the voltage sampling circuit 4; the booster circuit 2 is used for amplifying a power input voltage into a first output voltage; the voltage doubling circuit is used for generating a second output voltage, the second output voltage is N times of the first output voltage, and N is an integer greater than 1; the voltage sampling circuit 4 is configured to divide the second output voltage to output the feedback voltage.
Specifically, the electrotherapy voltage boosting and adjusting circuit of the invention adds a voltage doubling circuit on the basis of a conventional voltage boosting circuit, and the highest output voltage of the circuit is controlled by adopting a feedback voltage dividing resistor of the voltage sampling circuit; applying current output voltage (namely feedback voltage) to an analog-to-digital converter (ADC) of the processor after adopting resistance voltage division; the processor controls the enabling (SHDN) time of the boost chip to control the current output voltage of the circuit; and when the output voltage meets the requirement, the enabling of the boost chip is cancelled. The invention also adds an energy storage circuit of the high-voltage part to prepare for outputting high-voltage pulse.
For example, please refer to fig. 9, which shows a circuit diagram of an example of the electrotherapy voltage boosting and adjusting circuit of the present invention, wherein the boosting circuit includes a boosting chip U1, an inductor L1, a unidirectional boosting diode D1, a first energy storage capacitor C2 and a second energy storage capacitor C4; the boost chip U1 comprises an enable terminal EN, a voltage input terminal VIN, a switch output terminal SW, a feedback terminal FB and a ground terminal GND; one end of the inductor L1 is connected with a power supply input voltage Vin and the voltage input end VIN, and the other end of the inductor L1 is connected with the switch output end SW and the input end of the one-way booster diode D1; one end of the first energy storage capacitor C2 is connected with a power supply input voltage Vin, and the other end of the first energy storage capacitor C2 is grounded; one end of the second energy storage capacitor C4 is connected with the output end of the one-way boost diode D1, and the other end of the second energy storage capacitor C4 is grounded; the enable terminal EN and the feedback terminal FB are connected to the processor (not shown in fig. 9).
By way of example, the boost chip U1 may be a conventional integrated boost chip or other suitable chip.
As an example, as shown in fig. 9, the voltage doubling circuit is configured to perform voltage doubling 2 on the basis of the boost chip U1, and includes a first voltage doubling capacitor C1, a second voltage doubling capacitor C3, a first voltage doubling diode D2, and a second voltage doubling diode D3, where one end of the first voltage doubling capacitor C1 is connected to an input end of the unidirectional boost diode D1, and the other end of the first voltage doubling capacitor C1 is connected to an output end of the first voltage doubling diode D2; one end of the second voltage doubling capacitor C3 is connected with the output end of the unidirectional booster diode D1 and the input end of the first voltage doubling diode D2, and the other end of the second voltage doubling capacitor C3 is connected with the output end of the second voltage doubling diode D3.
As an example, as shown in fig. 9, the voltage sampling circuit includes a first sampling resistor R1 and a second sampling resistor R2; one end of the first sampling resistor R1 is connected with the output end of the voltage doubling circuit, and the other end of the first sampling resistor R1 is connected with the processor and grounded through the second sampling resistor R2. The first sampling resistor R1 and the second sampling resistor R2 function as a voltage limiting resistor for the second output voltage Vout, and perform voltage division, where Vout = Vfb (R1 + R2)/R2.
It should be noted that in other embodiments, the electrotherapy voltage boosting and adjusting circuit may use a higher-power voltage-doubling circuit as needed, and is not limited to the voltage-doubling circuit shown in fig. 9.
As an example, as shown in fig. 9, the electrotherapy voltage boosting and adjusting circuit further includes an output end energy storage capacitor C5 for storing electric quantity for outputting the high voltage pulse, wherein one end of the output end energy storage capacitor C5 is connected to the output end of the voltage doubling circuit, and the other end is grounded.
As an example, the processor includes an analog-to-digital conversion circuit, the analog-to-digital conversion circuit is connected to the voltage feedback circuit to obtain the feedback voltage Vfb and convert the feedback voltage Vfb into a digital signal, and the analog-to-digital conversion circuit is connected to the feedback terminal FB of the voltage boost circuit.
As an example, the electrotherapy voltage boosting and adjusting circuit controls the feedback voltage Vfb by controlling an enable time of the voltage boosting circuit, and further controls the second output voltage Vout, wherein the processor stops outputting an enable control signal when the voltage of the feedback voltage Vfb reaches a preset value.
The invention also provides an electrotherapy device which comprises the electrotherapy boosting and adjusting circuit and can be used for electromyography stimulation, and the high voltage of the electrotherapy device can be adjusted, so that the skin effects of the electrotherapy device under different environments or for different impedances can be ensured to be consistent.
In summary, the electrotherapy voltage boosting and adjusting circuit and the electrotherapy device thereof of the invention are added with the capacitance voltage doubling circuit on the basis of the voltage boosting circuit, thus realizing higher voltage boosting ratio; the circuit is safe, and the chip has the highest voltage limit; the control is simple, and only the time of the enabling pin of the boost chip needs to be controlled and the analog-to-digital conversion circuit of the processor needs to adopt feedback voltage; the whole circuit system is closed-loop control, and the output voltage is stable. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. An electrotherapy step-up and regulation circuit, comprising a processor, a step-up circuit, a voltage doubling circuit and a voltage sampling circuit which are connected in sequence, wherein the voltage sampling circuit is also connected with the processor, wherein:
the processor is used for outputting an enabling control signal to the booster circuit and acquiring the feedback voltage of the voltage sampling circuit;
the booster circuit is used for amplifying a power supply input voltage into a first output voltage;
the voltage doubling circuit is used for generating a second output voltage, the second output voltage is N times of the first output voltage, and N is an integer greater than 1;
the voltage sampling circuit is used for dividing the second output voltage to output the feedback voltage.
2. The electrotherapy voltage boosting and adjusting circuit of claim 1, wherein: the boost circuit comprises a boost chip, an inductor, a unidirectional boost diode, a first energy storage capacitor and a second energy storage capacitor; the boost chip comprises an enable end, a voltage input end, a switch output end, a feedback end and a grounding end; one end of the inductor is connected with a power supply input voltage and the voltage input end, and the other end of the inductor is connected with the switch output end and the input end of the one-way booster diode; one end of the first energy storage capacitor is connected with a power supply input voltage, and the other end of the first energy storage capacitor is grounded; one end of the second energy storage capacitor is connected with the output end of the unidirectional boost diode, and the other end of the second energy storage capacitor is grounded; the enabling end and the feedback end are connected with the processor.
3. The electrotherapy voltage boosting and adjusting circuit of claim 2, wherein: the voltage doubling circuit comprises a twice voltage doubling circuit.
4. The electrotherapy voltage boosting and adjusting circuit of claim 3, wherein: the voltage doubling circuit comprises a first voltage doubling capacitor, a second voltage doubling capacitor, a third voltage doubling capacitor, a fourth voltage doubling capacitor, a first voltage doubling diode, a second voltage doubling diode, a third voltage doubling diode and a fourth voltage doubling diode; one end of the first voltage-multiplying capacitor is connected with the input end of the unidirectional booster diode, and the other end of the first voltage-multiplying capacitor is connected with the output end of the first voltage-multiplying diode; one end of the second voltage-multiplying capacitor is connected with the output end of the first voltage-multiplying diode and the input end of the second voltage-multiplying diode, and the other end of the second voltage-multiplying capacitor is connected with the output end of the third voltage-multiplying diode and the input end of the fourth voltage-multiplying diode; one end of the third voltage doubling capacitor is connected with the input end of the unidirectional booster diode and the input end of the first voltage doubling diode, and the other end of the third voltage doubling capacitor is connected with the output end of the second voltage doubling diode and the input end of the third voltage doubling diode; one end of the fourth voltage doubling capacitor is connected with the input end of the third voltage doubling diode, and the other end of the fourth voltage doubling capacitor is connected with the output end of the fourth voltage doubling diode.
5. The electrotherapy voltage boosting and adjusting circuit of claim 1, wherein: the voltage sampling circuit comprises a first sampling resistor and a second sampling resistor; one end of the first sampling resistor is connected with the output end of the voltage doubling circuit, and the other end of the first sampling resistor is connected with the processor and grounded through the second sampling resistor.
6. The electrotherapy voltage boosting and adjusting circuit of claim 1, wherein: the electrotherapy voltage boosting and adjusting circuit further comprises an output end energy storage capacitor, one end of the output end energy storage capacitor is connected with the output end of the voltage doubling circuit, and the other end of the output end energy storage capacitor is grounded.
7. The electrotherapy voltage boosting and adjusting circuit of claim 1, wherein: the processor comprises an analog-to-digital conversion circuit, the analog-to-digital conversion circuit is connected with the voltage feedback circuit to obtain the feedback voltage and convert the feedback voltage into a digital signal, and the analog-to-digital conversion circuit is connected with the feedback end of the booster circuit.
8. The electrotherapy voltage boosting and adjusting circuit of claim 1, wherein: the electrotherapy voltage boosting and adjusting circuit controls the second output voltage by controlling the enabling time of the voltage boosting circuit.
9. The electrotherapy voltage boosting and adjusting circuit of claim 1, wherein: and when the feedback voltage reaches a preset value, the processor stops outputting an enabling control signal.
10. An electrotherapy device comprising: the electrotherapy device includes an electrotherapy voltage boost and adjustment circuit according to any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111086775.1A CN115804908A (en) | 2021-09-16 | 2021-09-16 | Electrotherapy steps up and adjusting circuit and electrotherapy equipment thereof |
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| CN202111086775.1A CN115804908A (en) | 2021-09-16 | 2021-09-16 | Electrotherapy steps up and adjusting circuit and electrotherapy equipment thereof |
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| CN115804908A true CN115804908A (en) | 2023-03-17 |
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