CN115475329A - Bipolar waveform generating circuit for electrotherapy device - Google Patents
Bipolar waveform generating circuit for electrotherapy device Download PDFInfo
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- CN115475329A CN115475329A CN202110662231.9A CN202110662231A CN115475329A CN 115475329 A CN115475329 A CN 115475329A CN 202110662231 A CN202110662231 A CN 202110662231A CN 115475329 A CN115475329 A CN 115475329A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/36—Applying electric currents by contact electrodes alternating or intermittent currents for stimulation
- A61N1/36014—External stimulators, e.g. with patch electrodes
- A61N1/3603—Control systems
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- Heart & Thoracic Surgery (AREA)
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- Electrotherapy Devices (AREA)
Abstract
The present invention provides a bipolar waveform generation circuit for an electrotherapy apparatus, including: the signal level conversion unit is used for converting the PWM signal input by the processor into a high-voltage pulse driving signal; the output driving unit is used for outputting the high-voltage pulse driving signal to the load unit; a load unit; and the energy storage capacitor charges the energy storage capacitor after the positive pulse current passes through the load unit to form a positive half part of the bipolar waveform when the high-voltage pulse driving signal is output to the load unit to generate the positive pulse current, and discharges the energy storage capacitor to generate the negative pulse current through the load unit to form a negative half part of the bipolar waveform after the positive pulse current is finished. The bipolar wave form and the charge balance are realized by only one charge-discharge backflow path of the energy storage capacitor, the structure is simple, the accumulated charge and the static electricity can be effectively eliminated, and the electrotherapy effect is effectively improved.
Description
Technical Field
The invention belongs to the field of medical equipment design, and particularly relates to a bipolar waveform generation circuit for electrotherapy equipment and the electrotherapy equipment.
Background
Electrotherapy is a method of treating disease using different types of electrical current. The principle is as follows: the electric energy acts on human body to cause physical and chemical reactions in vivo, and influences the functions of tissues and organs through nerve-body fluid action, thereby achieving the purposes of eliminating pathogeny, regulating functions, improving metabolism, enhancing immunity, and promoting the repair and regeneration of damaged tissues. The low and medium frequency currents can also be used for judging the motor function of the neuromuscular system so as to diagnose the degree of peripheral nerve damage. In order to prevent static electricity or weakened electrotherapy effects if charges are accumulated at one location for a long time, an electrotherapy apparatus generally outputs a bipolar output waveform as an electrostimulation output.
The existing electrotherapy equipment for realizing the bipolar waveform has the defects of complex power supply circuit, high requirement on control signals, easy explosion and the like.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, it is an object of the present invention to provide a bipolar waveform generating circuit for an electrotherapy apparatus and an electrotherapy apparatus for solving the problems of the prior art that the electrotherapy apparatus implementing a bipolar waveform has a complicated power supply circuit, high requirements for a control signal, and is easy to explode.
To achieve the above and other related objects, the present invention provides a bipolar waveform generation circuit for an electrotherapy apparatus, comprising: the signal level conversion unit is used for converting the PWM signal input by the processor into a high-voltage pulse driving signal; the output driving unit is connected with the signal level conversion unit and used for outputting the high-voltage pulse driving signal to the load unit; the load unit is connected with the output driving unit and used for generating positive pulse current under the high-voltage pulse driving signal and generating negative pulse current when the energy storage capacitor discharges; and the energy storage capacitor is connected with the load unit, when the high-voltage pulse driving signal is output to the load unit to generate a positive pulse current, the positive pulse current passes through the load unit and then charges the energy storage capacitor to form a positive half part of a bipolar waveform, and when the positive pulse current is finished, the energy storage capacitor discharges to generate a negative pulse current through the load unit to form a negative half part of the bipolar waveform.
Optionally, the signal level conversion unit includes a first switch transistor, a second switch transistor, a first resistor, and a second resistor, a first pole of the first switch transistor is connected to the input power source and a first end of the first resistor, a second pole is connected to the input end of the output driving unit as an output end of the signal level conversion unit, a control pole is connected to a second end of the first resistor and a first end of the second resistor, a second pole of the second switch transistor is connected to a second end of the second resistor, the first pole is grounded, and the control pole is connected to the PWM signal input by the processor.
Optionally, the first switching transistor is a PNP-type triode, the first pole of the first switching transistor is an emitter, the second pole of the first switching transistor is a collector, the control pole is a base, the second switching transistor is an NPN-type triode, the first pole of the second switching transistor is an emitter, the second pole of the second switching transistor is a collector, and the control pole is a base.
Optionally, a third resistor is further connected in series between the control electrode of the second switching transistor and the PWM signal input by the processor.
Optionally, the output driving unit includes a third switching transistor, a fourth switching transistor and a fourth resistor, a second pole of the third switching transistor is connected to the input power supply, a first pole of the third switching transistor is connected to the load unit, a control pole of the third switching transistor is connected to the output end of the signal level converting unit, a first pole of the fourth switching transistor is connected to the load unit, a second pole of the fourth switching transistor is grounded, the control pole of the fourth switching transistor is connected to the output end of the signal level converting unit, a first end of the fourth resistor is connected to control ends of the third switching transistor and the fourth switching transistor, and a second end of the fourth resistor is grounded.
Optionally, the third switching transistor is an NPN-type triode, the first electrode of the third switching transistor is an emitter, the second electrode of the third switching transistor is a collector, and the control electrode of the third switching transistor is a base, the fourth switching transistor is a PNP-type triode, the first electrode of the fourth switching transistor is an emitter, the second electrode of the fourth switching transistor is a collector, and the control electrode of the fourth switching transistor is a base.
Optionally, the load cell is a load between two selected contact points on the human body.
Optionally, the contact point is selected from one of a head, a neck, a shoulder, a back, and a limb in a human body.
Optionally, a relation between the time constant τ of the energy storage capacitor and the waveform period T of the bipolar waveform is T > > τ, where the time constant τ = RC of the energy storage capacitor, R is a resistance value of the load unit, and C is a capacitance value of the energy storage capacitor.
Optionally, the maximum voltage of the energy storage capacitor discharge is smaller than the maximum voltage of the high-voltage pulse driving signal output by the output driving unit.
The present invention also provides an electrotherapy apparatus including the bipolar waveform generation circuit for an electrotherapy apparatus according to any one of claims 1 to 9.
As described above, the bipolar waveform generation circuit for an electrotherapy apparatus and the electrotherapy apparatus of the present invention have the following advantageous effects:
the power supply of the invention has simple structure, and the circuit only needs a single power supply for power supply.
The control signal of the invention is simple, only needs single-channel signal control, has lower requirement on the signal and can effectively improve the application range of the equipment.
The driving circuit is simple, the triode or the field effect transistor can realize the driving of the circuit, and the cost of the circuit can be effectively reduced.
The bipolar implementation mode of the invention is simple, bipolar waveform and charge balance can be realized only by a charge-discharge backflow path of the energy storage capacitor, the generation of accumulated charge and static electricity can be effectively eliminated or reduced, and the electrotherapy effect can be effectively improved.
The invention realizes bipolar waveform through the energy storage capacitor, can effectively inhibit the generation of overlarge current, can effectively improve the safety of the electrotherapy equipment, and can not cause accidental burn to human bodies due to the large current.
Drawings
Fig. 1 shows a schematic diagram of an actual circuit structure of a dual power driving circuit.
Fig. 2 is a schematic diagram showing an actual circuit structure of an H-bridge circuit.
Fig. 3 is a block diagram showing the configuration of a bipolar waveform generating circuit for an electrotherapy apparatus according to the present invention.
Fig. 4 is a schematic diagram showing a circuit configuration of a bipolar waveform generating circuit for an electrotherapy apparatus of the present invention.
Fig. 5 is a waveform diagram showing the input PWM signal and the output bipolar waveform according to the present invention.
Description of the element reference numerals
10. Signal level conversion unit
20. Output drive unit
30. Load cell
40. Energy storage capacitor
Q1 first switching transistor
Q2 second switching transistor
Q3 third switching transistor
Q4 fourth switching transistor
R1 first resistor
R2 second resistance
R3 third resistance
R4 fourth resistor
Detailed Description
The following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. 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.
As in the detailed description of the embodiments of the present invention, the cross-sectional views illustrating the device structures are not partially enlarged in general scale for convenience of illustration, and the schematic views are only examples, which should not limit the scope of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in the actual fabrication.
Spatially relative terms, such as "under," "below," "lower," "below," "over," "upper," and the like, may be used herein for convenience in describing the relationship of one element or feature to another element or feature illustrated in the figures. It will be understood that these terms of spatial relationship are intended to encompass other orientations of the device in use or operation in addition to the orientation depicted in the figures. In addition, when a layer is referred to as being "between" two layers, it can be the only layer between the two layers, or one or more intervening layers may also be present.
In the context of this application, a structure described as a first feature being "on" a second feature may include embodiments where the first and second features are formed in direct contact, and may also include embodiments where additional features are formed in between the first and second features, such that the first and second features may not be in direct contact.
It should be noted that the drawings provided in the present embodiment are only for schematically illustrating the basic idea of the present invention, and the drawings only show the components related to the present invention rather than being drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of each component in actual implementation may be arbitrarily changed, and the layout of the components may be more complicated.
The scheme for realizing the bipolar waveform output comprises a dual-power drive circuit and an H-bridge circuit.
As shown in fig. 1, the dual power supply driving circuit is composed of a positive and negative power supply circuit, a signal level conversion circuit, and upper and lower driving transistors, and an actual circuit is shown in fig. 1.
The dual-power drive circuit is characterized in that: 1) The control signal is simple, and only one signal is output; 2) The control is simple, the condition that the upper transistor and the lower transistor are simultaneously conducted does not exist, and the stability is high; 3) The circuit is relatively complex, and the positive and negative power supply circuits are relatively complex (not shown in fig. 1); 4) The conversion efficiency is not high, and the output of the two power supplies only occupies half of the waveform.
As shown in fig. 2, the H-bridge circuit includes a one-way power supply, a signal level conversion circuit, and an H-bridge of 4 transistors, and one practical circuit configuration is shown in fig. 2.
The H-bridge circuit is characterized in that: 1) The needed power supply circuit is relatively simple, and bipolar output can be realized by a single-path power supply; 2) The conversion efficiency of the power supply is high; 3) The control signal is complex, and at least two paths of signals are required to be output; 4) The dead zone of the signal must be controlled, and the two signals are high at the same time due to any reason, so that the transistor is burnt out.
For the reasons, the dual-power drive realizes the bipolar waveform, which has the problems of complex power circuit, high requirement of the H-bridge circuit for realizing the bipolar waveform on the control signal and easy explosion, and is not suitable for the portable electrotherapy stimulator.
As shown in fig. 3, the present invention provides a bipolar waveform generating circuit for an electrotherapy apparatus, the bipolar waveform generating circuit including: the circuit comprises a signal level conversion unit 10, an output driving unit 20, a load unit 30 and an energy storage capacitor 40.
As shown in fig. 3, the signal level conversion unit 10 is configured to convert a PWM signal input by a processor into a high-voltage pulse driving signal.
As shown in fig. 4, the signal level conversion unit 10 includes a first switching transistor Q1, a second switching transistor Q2, a first resistor R1, and a second resistor R2, wherein a first pole of the first switching transistor Q1 is connected to an input power source and a first end of the first resistor R1, a second pole is connected to an input end of the output driving unit 20 as an output end of the signal level conversion unit 10, a control pole is connected to a second end of the first resistor R1 and a first end of the second resistor R2, a second pole of the second switching transistor Q2 is connected to a second end of the second resistor R2, the first pole is grounded, and the control pole is connected to a PWM signal input by the processor.
Specifically, in this embodiment, the first switching transistor Q1 is a PNP-type triode, the first electrode of the first switching transistor Q1 is an emitter electrode, the second electrode of the first switching transistor Q1 is a collector electrode, and the control electrode is a base electrode, the second switching transistor Q2 is an NPN-type triode, the first electrode of the second switching transistor Q2 is an emitter electrode, the second electrode of the second switching transistor Q2 is a collector electrode, and the control electrode is a base electrode.
Of course, in other embodiments, the first switching transistor Q1 and the second switching transistor Q2 may be implemented by a field effect transistor (MOS), such as an NMOS transistor or a PMOS transistor, and are not limited to the above-mentioned examples.
As shown in fig. 4, a third resistor R3 is further connected in series between the control electrode of the second switching transistor Q2 and the PWM signal input by the processor, so as to ensure the stability of signal input.
As shown in fig. 3, the output driving unit 20 is connected to the signal level converting unit 10, and is configured to output the high-voltage pulse driving signal to a load unit 30.
As shown in fig. 4, in the present embodiment, the output driving unit 20 includes a third switching transistor Q3, a fourth switching transistor Q4 and a fourth resistor R4, a second pole of the third switching transistor Q3 is connected to the input power, a first pole of the third switching transistor Q3 is connected to the load unit 30, a control pole of the third switching transistor Q4 is connected to the output terminal of the signal level converting unit 10, a first pole of the fourth switching transistor Q4 is connected to the load unit 30, a second pole of the fourth switching transistor Q4 is grounded, a control pole of the fourth switching transistor Q4 is connected to the output terminal of the signal level converting unit 10, a first end of the fourth resistor R4 is connected to the control ends of the third switching transistor Q3 and the fourth switching transistor Q4, and a second end of the fourth resistor R4 is grounded.
Specifically, in this embodiment, the third switching transistor Q3 is an NPN type transistor, the first electrode of the third switching transistor Q3 is an emitter, the second electrode thereof is a collector, and the control electrode thereof is a base, the fourth switching transistor Q4 is a PNP type transistor, the first electrode of the fourth switching transistor Q4 is an emitter, the second electrode thereof is a collector, and the control electrode thereof is a base.
Of course, in other embodiments, the third switching transistor Q3 and the fourth switching transistor Q4 may also be implemented by a field effect transistor (MOS), such as an NMOS transistor or a PMOS transistor, and are not limited to the above-mentioned examples.
As shown in fig. 3 and 4, the load unit 30 is connected to the output driving unit 20, and is configured to generate a positive pulse current under the high-voltage pulse driving signal, and generate a negative pulse current when the energy storage capacitor 40 is discharged.
For example, the load cell 30 is a load between two selected contact points on the human body. Specifically, the contact point is selected from one of a head, a neck, a shoulder, a back, and an extremity in a human body.
In one embodiment, the two contact points are both arranged on the neck of the human body to carry out electrotherapy on the neck of the human body; in another embodiment, the two contact points are both disposed on the shoulder of the human body to perform electrotherapy on the shoulder of the human body; in another embodiment, the two contact points are respectively arranged on the left lower limb and the right lower limb of the human body, and the stimulation parts are symmetrical to each other, so that the two contact points can be used for rehabilitation exercises for promoting the human body to recover walking.
As shown in fig. 3, the energy-storage capacitor 40 is connected to the load unit 30, when the high-voltage pulse driving signal is output to the load unit 30 to generate a positive pulse current, the positive pulse current passes through the load unit 30 and then charges the energy-storage capacitor 40 to form a positive half of a bipolar waveform, and when the positive pulse current is ended, the energy-storage capacitor 40 discharges and generates a negative pulse current through the load unit 30 to form a negative half of the bipolar waveform.
In this embodiment, a relationship between a time constant τ of the energy storage capacitor 40 and a waveform period T of the bipolar waveform is T > > τ, where the time constant τ = RC of the energy storage capacitor 40, R is a resistance value of the load unit 30, and C is a capacitance value of the energy storage capacitor 40, and the waveform period T of the present invention is much greater than the time constant τ of the capacitor, so that the storage capacitor can have a higher discharge response speed, thereby implementing the bipolar waveform, for example, in an embodiment, the relationship between the time constant τ of the energy storage capacitor 40 and the waveform period T of the bipolar waveform is T ≧ 10 τ; in another embodiment, the relation between the time constant τ of the energy storage capacitor 40 and the waveform period T of the bipolar waveform is T ≧ 50 τ; in yet another embodiment, the relation between the time constant τ of the energy storage capacitor 40 and the waveform period T of the bipolar waveform is T ≧ 100 τ.
In this embodiment, the maximum voltage of the discharge of the energy storage capacitor 40 is less than the maximum voltage of the high-voltage pulse driving signal output by the output driving unit 20, so that the safety of the circuit is effectively improved, and the accidental burn of the human body due to the large current cannot occur.
It should be noted that, the energy storage capacitor 40 of the present invention performs charging and discharging operations only after the load unit 30 (such as a human body) is connected, and the electric quantity stored in the energy storage capacitor is not substantially lost after the load unit 30 is disconnected, so as to effectively save the power consumption of the circuit.
Fig. 5 shows a waveform signal diagram of the input PWM signal and the output bipolar waveform of the present invention, it can be seen from the figure that the input PWM signal is unipolar waveform, the waveform output by the bipolar waveform generating circuit of the present invention is bipolar waveform, which includes a positive half part and a negative half part, as can be seen from fig. 5, the positive half part of the bipolar waveform has the same period as the positive pulse waveform of the input PWM signal, and the negative half part of the bipolar waveform is located between the positive pulse waveforms, which can effectively eliminate or reduce the generation of accumulated charges and static electricity, and can effectively improve the electrotherapy effect.
In addition, the present embodiment also provides an electrotherapy apparatus including the bipolar waveform generation circuit for an electrotherapy apparatus described above.
As described above, the bipolar waveform generation circuit for an electrotherapy apparatus and the electrotherapy apparatus of the present invention have the following advantageous effects:
the power supply of the invention has simple structure, and the circuit only needs a single power supply for power supply.
The control signal of the invention is simple, only needs single-channel signal control, has lower requirement on the signal and can effectively improve the application range of the equipment.
The driving circuit is simple, the triode or the field effect transistor can realize the driving of the circuit, and the cost of the circuit can be effectively reduced.
The bipolar implementation mode of the invention is simple, bipolar waveform and charge balance can be realized only by a charge-discharge backflow path of the energy storage capacitor, the generation of accumulated charge and static electricity can be effectively eliminated or reduced, and the electrotherapy effect can be effectively improved.
The invention realizes bipolar waveform through the energy storage capacitor, can effectively inhibit the generation of overlarge current, can effectively improve the safety of the electrotherapy equipment, and can not cause accidental burn to human bodies due to the large current.
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. Those skilled in the art can modify or change the above-described 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 (11)
1. A bipolar waveform generating circuit for an electrotherapy device, said bipolar waveform generating circuit comprising:
the signal level conversion unit is used for converting the PWM signal input by the processor into a high-voltage pulse driving signal;
the output driving unit is connected with the signal level conversion unit and used for outputting the high-voltage pulse driving signal to the load unit;
the load unit is connected with the output driving unit and used for generating positive pulse current under the high-voltage pulse driving signal and generating negative pulse current when the energy storage capacitor discharges;
and the energy storage capacitor is connected with the load unit, when the high-voltage pulse driving signal is output to the load unit to generate a positive pulse current, the positive pulse current passes through the load unit and then charges the energy storage capacitor to form a positive half part of a bipolar waveform, and when the positive pulse current is finished, the energy storage capacitor discharges to generate a negative pulse current through the load unit to form a negative half part of the bipolar waveform.
2. The bipolar waveform generating circuit for an electrotherapy device according to claim 1, wherein: the signal level conversion unit comprises a first switch transistor, a second switch transistor, a first resistor and a second resistor, wherein a first pole of the first switch transistor is connected with an input power supply and a first end of the first resistor, a second pole of the first switch transistor is connected with an input end of the output driving unit as an output end of the signal level conversion unit, a control pole of the first switch transistor is connected with a second end of the first resistor and a first end of the second resistor, a second pole of the second switch transistor is connected with a second end of the second resistor, the first pole of the second switch transistor is grounded, and the control pole of the second switch transistor is connected with a PWM signal input by the processor.
3. The bipolar waveform generating circuit for an electrotherapy device according to claim 2, wherein: the first switch transistor is a PNP type triode, the first pole of the first switch transistor is an emitting pole, the second pole of the first switch transistor is a collecting pole, the control pole is a base pole, the second switch transistor is an NPN type triode, the first pole of the second switch transistor is an emitting pole, the second pole of the second switch transistor is a collecting pole, and the control pole is a base pole.
4. The bipolar waveform generating circuit for an electrotherapy device according to claim 2, wherein: and a third resistor is connected between the control electrode of the second switching transistor and the PWM signal input by the processor in series.
5. The bipolar waveform generation circuit for an electrotherapy apparatus according to claim 1, wherein: the output driving unit comprises a third switching transistor, a fourth switching transistor and a fourth resistor, a second pole of the third switching transistor is connected with an input power supply, a first pole of the third switching transistor is connected with the load unit, a control pole of the third switching transistor is connected with an output end of the signal level conversion unit, a first pole of the fourth switching transistor is connected with the load unit, a second pole of the fourth switching transistor is grounded, the control pole of the fourth switching transistor is connected with an output end of the signal level conversion unit, a first end of the fourth resistor is connected with control ends of the third switching transistor and the fourth switching transistor, and a second end of the fourth switching transistor is grounded.
6. The bipolar waveform generating circuit for an electrotherapy device according to claim 5, wherein: the third switching transistor is an NPN type triode, the first pole of the third switching transistor is an emitting pole, the second pole of the third switching transistor is a collecting pole, the control pole is a base pole, the fourth switching transistor is a PNP type triode, the first pole of the fourth switching transistor is an emitting pole, the second pole of the fourth switching transistor is a collecting pole, and the control pole is a base pole.
7. The bipolar waveform generating circuit for an electrotherapy device according to claim 1, wherein: the load cell is a load between two selected contact points on the human body.
8. The bipolar waveform generation circuit for an electrotherapy device according to claim 7, wherein: the contact point is selected from one of a head, a neck, a shoulder, a back, and an extremity of a human body.
9. The bipolar waveform generating circuit for an electrotherapy device according to claim 1, wherein: the relation between the time constant tau of the energy storage capacitor and the waveform period T of the bipolar waveform is T > > tau, wherein the time constant tau of the energy storage capacitor = RC, R is the resistance value of the load unit, and C is the capacitance value of the energy storage capacitor.
10. The bipolar waveform generating circuit for an electrotherapy device according to claim 1, wherein: the maximum voltage of the energy storage capacitor discharge is smaller than the maximum voltage of the high-voltage pulse driving signal output by the output driving unit.
11. An electrotherapy apparatus, characterized in that said electrotherapy apparatus comprises a bipolar waveform generation circuit for an electrotherapy apparatus according to any one of claims 1 to 10.
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| CN202110662231.9A CN115475329A (en) | 2021-06-15 | 2021-06-15 | Bipolar waveform generating circuit for electrotherapy device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116943022A (en) * | 2023-07-25 | 2023-10-27 | 北京领创医谷科技发展有限责任公司 | Charge balance circuit and charging and discharging method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116943022A (en) * | 2023-07-25 | 2023-10-27 | 北京领创医谷科技发展有限责任公司 | Charge balance circuit and charging and discharging method |
| CN116943022B (en) * | 2023-07-25 | 2024-04-30 | 北京领创医谷科技发展有限责任公司 | Charge balance circuit and charging and discharging method |
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