CN101530650B - Magnetic stimulator for reducing power and control method thereof - Google Patents
Magnetic stimulator for reducing power and control method thereof Download PDFInfo
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- CN101530650B CN101530650B CN 200910068408 CN200910068408A CN101530650B CN 101530650 B CN101530650 B CN 101530650B CN 200910068408 CN200910068408 CN 200910068408 CN 200910068408 A CN200910068408 A CN 200910068408A CN 101530650 B CN101530650 B CN 101530650B
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Abstract
The invention relates to a magnetic stimulator for reducing power and a control method thereof. The magnetic stimulator comprises a forward and reverse charging switch block for charging a capacitor bank; a discharge coil for receiving the discharge current of the capacitor bank via the forward and reverse discharge switch block, a forward and reverse voltage comparison circuit for comparing with a preset charging voltage and a control circuit for controlling the forward and reverse charging switch block and the forward and reverse discharge switch block respectively by a switch driving circuit according to the comparison result, wherein, the discharge coil also transmits electric energy to the capacitor bank via the forward and reverse discharge switch block. The method is as follows: initialize setup, carrying out forward charging to a preset value, carrying out forward discharging till reaching discharge time; carrying out reverse charging to a preset value, carrying out reverse discharging till reaching discharge time, and returning to the second step. The invention can realize bi-directionally charging and discharging of non-polarized capacitor, the dump energy can be effectively used after each discharging, thus improving capacity usage ratio, reducing the power consumption of source and improving magnetic stimulus frequency under certain power consumption.
Description
Technical field
The present invention relates to a kind of medical magnetic stimulator device.Particularly relate to a kind of power consumption that reduced, can realize the magnetic stimulator and the control method thereof of the reduction power consumption that repeated magnetic stimulates.
Background technology
It is a kind of magnetic stimulating technology that was at first proposed by Barker etc. in 1985 that magnetic stimulates (TMS), is a kind ofly to apply the technology that pulsed magnetic field stimulates specific part in the body external.Because the magnetic stimulation has non-invasive; Iunjected charge has not overcome the skin pain that electricity irritation causes in body; Thereby especially since the magnetic conductance rate variance between the human body different tissues than electric conductivity difference little the magnetic of Duo stimulate compare with electricity irritation penetrate more easily electrical conductivity less as in the osseous tissue entering body.Therefore in recent years, in neurological and neural electrophysiology field, pulsed magnetic field more and more receives people's attention to the Mechanism Study and the clinical practice of nerve stimulation in the body.
Magnetic stimulates operation principle to be, places an insulated coil at external specific part, and moment is through heavy current, according to Faradic electricity magnetic induction theorem in coil:
The coil surrounding space can generate an electromagnetic field, and magnetic field penetration is organized in corresponding position and produces induced current, when induced current surpasses the excited threshold value of nervous tissue, makes local aixs cylinder generation depolarization and makes nervous tissue excited.
Existing magnetic stimulator circuit is through realizing that to the electric capacity charging with through the electromagnetic energy transformation process of inductive discharge magnetic stimulates.Circuit generally is made up of storage capacitor (power supply), solid-state switch and coil, uses polar capacitor to charge, and dump energy behind the coil discharge is bled off through leadage circuit, carries out charge and discharge process next time again.With commonly used stimulating through cranial nerves magnetic is example, and the effective magnetic of single stimulates institute's energy requirement to surpass 500J, and the magnetic of 30Hz stimulates if desired, and power consumption will reach 15KW, and the energy expenditure that magnetic stimulates has limited the frequency applications that magnetic stimulates.
Summary of the invention
Technical problem to be solved by this invention is, a kind of magnetic stimulator and control method thereof to the reduction power consumption of the two-way magnetic stimulation circuit that discharges and recharges of electric capacity that realize that has by microprocessor control is provided.
The technical scheme that the present invention adopted is: a kind of magnetic stimulator and control method thereof that reduces power consumption, wherein, reduce the magnetic stimulator of power consumption, and include dc source; Receive the electric current of dc source and the forward and reverse charging switches set of charging to capacitance group; The discharge coil of the discharge current through forward and reverse discharge switch group of received capacitance group, described discharge coil also sends electric flux to capacitance group through forward and reverse discharge switch group; Receive capacitance group voltage signal and with preset forward and reverse voltage comparator circuit that charging voltage compares; Receive the comparison signal of forward and reverse voltage comparator circuit, and control the control circuit of forward and reverse charging switches set and forward and reverse discharge switch group respectively through switch driving circuit according to comparative result.
Described forward and reverse charging switches set, forward and reverse discharge switch group comprise a plurality of Large-power High-Speed switches such as IGBT or controllable silicon, and wherein, first power speed-sensitive switch and second largest power speed-sensitive switch constitute the positive charge switch of capacitance group; The third-largest power speed-sensitive switch and the fourth-largest power speed-sensitive switch constitute the reverse charging switch of capacitance group; The fifth-largest power speed-sensitive switch and the sixth-largest power speed-sensitive switch constitute the forward discharge switch of capacitance group; The seventh-largest power speed-sensitive switch and the eighth-largest power speed-sensitive switch constitute the back discharge switch of capacitance group; Described first input to the eighth-largest power speed-sensitive switch, outfan and trigger end connect the signal output part of switch driving circuit respectively; The first sampling capacitance voltage and the second sampling capacitance voltage of capacitance group all are connected to forward and reverse voltage comparator circuit.
Described forward and reverse voltage comparator circuit includes regulator block and the comparator that links to each other with regulator block; The input foot 5 of described comparator receives the first sampling capacitance voltage and the second sampling capacitance voltage of capacitance group, the input of outfan foot 2 output voltages to the control circuit of comparator; Be connected the digital variable resistance on the Voltage stabilizing module LM317 through adjusting, the change datum, thus preset different electric capacity charge voltage.
The reference ground of described forward and reverse voltage comparator circuit links to each other with the reference ground of dc source through switch.
Described switch driving circuit comprises the EXB841 chip for driving; The switch actuating signals of the signal input part reception control circuit output of described EXB841 chip for driving, three signal output parts of EXB841 chip for driving connect the C utmost point, the E utmost point and the G utmost point of each the Large-power High-Speed switch in forward and reverse charging switches set and the forward and reverse discharge switch group respectively.
A kind of control method that is used to reduce the magnetic stimulator of power consumption of the present invention comprises the steps:
1) initialization setting;
2) conduct positive charge switch carries out positive charge, judges whether charging voltage reaches preset value, is to get into next step, otherwise proceeds positive charge;
3) turn-off the positive charge switch, the conduct positive discharge switch carries out the forward discharge, judges whether to reach the discharge time of setting, is to get into next step, otherwise proceeds the forward discharge;
4) turn-off the forward discharge switch, conducting reverse charging switch carries out reverse charging, judges whether charging voltage reaches preset value, is to get into next step, otherwise proceeds reverse charging;
5) turn-off reversal charge switch, conducting back discharge switch carries out back discharge, judges whether to reach the discharge time of setting, is to get into next step, otherwise proceeds back discharge;
6) turn-off reversal discharge switch returns the 2nd step.
Described initialization setting comprises the initial value that presets the charging reference voltage, presets forward and reverse discharge intervalometer, specifies the responsible respectively control output signal of controlling positive charge switch, reverse charging switch, forward discharge switch, back discharge switch of four ports of single-chip microcomputer.
The magnetic stimulator of reduction power consumption of the present invention and control method thereof, but the polarity free capacitor of employing forward and reverse charging realize the two-way of electric capacity discharged and recharged, and each discharge back dump energy obtains utilization.Among the present invention, the RCL circuit working is at underdamping state, electric capacity to inductive discharge after, added up certain surplus energy in the electric capacity, this part surplus energy can use when stimulate next time.
Through microprocessor regulating and controlling four-way switch group; Can realize the two-way of polarity free capacitor discharged and recharged, the dump energy after each discharge can effectively be utilized, and has improved capacity usage ratio; Reduce the power consumption of power supply, thereby under certain power consumption, improve the magnetic stimulus frequency.
Description of drawings
Fig. 1 is the structured flowchart that the present invention reduces the magnetic stimulator formation of power consumption;
Fig. 2 is forward and reverse charge-discharge circuit schematic diagram;
Fig. 3 is the control sequential chart;
Fig. 4 is a forward and reverse charging voltage comparator circuit schematic diagram;
Fig. 5 is the switch driving circuit schematic diagram;
Fig. 6 is the flow chart of control method of the present invention.
Wherein:
1: control circuit 2: the forward and reverse charging switches set
3: forward and reverse discharge switch group 4: forward and reverse voltage comparator circuit
5: switch driving circuit 6: capacitance group
7: discharge coil 8: dc source
The specific embodiment
Below in conjunction with embodiment and accompanying drawing the magnetic stimulator and the control method thereof of reduction power consumption of the present invention are made detailed description.
Usually; The induction field that coil such as common decision such as the position of the shape of induction coil, the relative stimulation location of coil and direction and tissue conductivities etc. produces; For the discharge circuit of having confirmed coil shape; The induced current that magnetic thorn exciting field produces is proportional to the discharge current time differential, should improve current changing rate for obtaining high induced current as far as possible.Have only the threshold value that surpasses NAP when induced current when (comprising time threshold and amplitude threshold), just can reach neuroactive physiologic effect.According to the analysis of the classical circuit of RCL, second-order circuit is operated in underdamping state can access the faradic current pulse that pulsewidth and amplitude meet the demands, and decay is shaken angular frequency and is under the underdamping condition:
ω
dBig more, frequency of oscillation is fast more, shows the speed that electromagnetic energy transmits between electric capacity and inductance; Attenuation quotient does
α is big more, and voltage attenuation is fast more on the electric capacity, shows on the electric capacity energy expenditure on the resistance on the series circuit, the speed that finally goes to zero.
The magnetic stimulator of reduction power consumption of the present invention and control method thereof; For obtaining suitable current rate of change pulsewidth and amplitude, adopt the underdamping duty, when the inductive discharge waveform arrives the half period; The capacitor discharge waveform was merely for 1/4 cycle, and promptly voltage is reverse maximum.Its principle is: electric capacity, reduces because the electric current in the inductance of flowing through reaches maximum and begins when capacitance voltage approaches " zero " through inductive discharge, in inductance, can produce corresponding faradic current, and its sense of current is identical with the capacitor discharge direction.Stored certain backward voltage energy at this moment in the electric capacity.
As shown in Figure 1, the magnetic stimulator of reduction power consumption of the present invention includes dc source 8; Receive the electric current of dc source 8 and the forward and reverse charging switches set 2 of charging to capacitance group 6; Receive the discharge coil 7 of the discharge current of capacitance group 6 through forward and reverse discharge switch group 3, described discharge coil 7 also sends discharge signal to capacitance group 6 through forward and reverse discharge switch group 3; Receive capacitance group 6 voltage signal and with preset forward and reverse voltage comparator circuit 4 that charging voltage compares; Receive the comparison signal of forward and reverse voltage comparator circuit 4, and control the control circuit 1 of forward and reverse charging switches set 2 and forward and reverse discharge switch group 3 respectively through switch driving circuit 5 according to comparative result.
As shown in Figure 2, described forward and reverse charging switches set 2, forward and reverse discharge switch group 3 comprise a plurality of Large-power High-Speed switches, and wherein, first power speed-sensitive switch A and second largest power speed-sensitive switch B constitute the positive charge switch of capacitance group 6; The third-largest power speed-sensitive switch C and the fourth-largest power speed-sensitive switch D constitute the reverse charging switch of capacitance group 6; The fifth-largest power speed-sensitive switch A1 and the sixth-largest power speed-sensitive switch D1 constitute the forward discharge switch of capacitance group 6; The seventh-largest power speed-sensitive switch B1 and the eighth-largest power speed-sensitive switch C1 constitute the back discharge switch of capacitance group 6; The described first colelctor electrode C to the eighth-largest power speed-sensitive switch A, B, C, D, A1, D1, B1, C1, emitter-base bandgap grading E and coral utmost point G connect the signal output part of switch driving circuit 5 respectively; The first sampling capacitance voltage V of capacitance group 6
01With the second sampling capacitance voltage V
02All be connected to forward and reverse voltage comparator circuit 4.Described Large-power High-Speed switch can adopt IGBT or controllable silicon, and that present embodiment adopts is IGBT.
As shown in Figure 4, described forward and reverse voltage comparator circuit 4 includes regulator block S2 and the comparator S4 that links to each other with regulator block S2, and the input foot 5 of described comparator S4 receives the first sampling capacitance voltage V of capacitance group 6
01With the second sampling capacitance voltage V
02, outfan foot 2 output voltage V of comparator S4
0To the input of control circuit 1, i.e. the INT1 foot of master chip 80C52; Through the digital variable resistance R that links to each other with adjusting Voltage stabilizing module LM317
S1, the change datum, thus preset different electric capacity charge voltage.The model of comparator S4 is LM339.
The reference ground of described forward and reverse voltage comparator circuit 4 links to each other with the reference ground of dc source through switch.
As shown in Figure 5, the switch driving circuit 5 among the present invention comprises EXB841 chip for driving S1, the signal input part V of described EXB841 chip for driving S1
2The switch actuating signals of reception control circuit 1 output, three signal output part C of EXB841 chip for driving S1, E, G connect three end C, E, the G of each IGBT in forward and reverse charging switches set 2 and the forward and reverse discharge switch group 3 respectively.S3 among Fig. 5 is a phase inverter.
The magnetic stimulator of reduction power consumption of the present invention, dc source are connected to positive charge switch the one IGBT and the 2nd IGBT, reverse charging switch the 3rd IGBT and the 4th IGBT in the forward and reverse charging switches set 2.During the charging beginning, positive charge switch the one IGBT and the 2nd IGBT conducting, sampling capacitance voltage Vo1 is connected to the V in forward and reverse voltage comparator circuit 4
1, compare with presetting charging voltage, when voltage on the electric capacity surpassed preset voltage, comparison circuit 4 output signal Vo were to control unit 1.When the electric capacity reverse charging, reverse charging switch C, D conducting, sampling capacitance voltage Vo2 is connected to the V in the voltage comparator circuit 4
1, when voltage on the electric capacity surpassed preset voltage, comparison circuit 4 output signal Vo were to control unit 1.Through regulating the digital variable resistance R on the Voltage stabilizing module LM317
S1, can change datum, thereby preset different electric capacity charge voltage.
The work process of the magnetic stimulator of reduction power consumption of the present invention is: 1. conduct positive charge switch, power supply through current-limiting resistance to the electric capacity positive charge; 2. break off the positive charge switch, the conduct positive discharge switch, electric capacity discharges to the inductance forward; With first cycle separated into two parts of discharge process, electric capacity is to inductive discharge in the preceding half period, and capacitance voltage reduces, and inductive current increases, and when capacitance voltage was zero, inductive current was a maximum; According to inductance characteristic, inductance begins to the electric capacity reverse charging, and capacitance voltage oppositely increases; 3. when inductive current was zero, voltage was reverse maximum in the electric capacity, at this moment, broke off the forward discharge switch, and conducting reverse charging switch, power supply pass through current-limiting resistance to the electric capacity reverse charging; 4. break off the reverse charging switch, conducting back discharge switch, electric capacity is to the inductance back discharge.
As shown in Figure 6, the control method that is used to reduce the magnetic stimulator of power consumption of the present invention comprises the steps:
1) initialization setting; Described initialization setting comprises the initial value that presets the charging reference voltage, presets forward and reverse discharge intervalometer, specifies the responsible respectively control output signal of controlling positive charge switch, reverse charging switch, forward discharge switch, back discharge switch of four ports of single-chip microcomputer etc.Secondly, set four interruptions, comprise that two external interrupt and forward and reverse two intervalometers interrupt.External interrupt receives the output signal of voltage comparator circuit, and internal interrupt then is responsible for to counting discharge time, to trigger charging process next time.
2) conduct positive charge switch carries out positive charge, judges whether charging voltage reaches preset value, is to get into next step, otherwise proceeds positive charge;
3) turn-off the positive charge switch, the conduct positive discharge switch carries out the forward discharge, judges whether to reach the discharge time of setting, is to get into next step, otherwise proceeds the forward discharge;
4) turn-off the forward discharge switch, conducting reverse charging switch carries out reverse charging, judges whether charging voltage reaches preset value, is to get into next step, otherwise proceeds reverse charging;
5) turn-off reversal charge switch, conducting back discharge switch carries out back discharge, judges whether to reach the discharge time of setting, is to get into next step, otherwise proceeds back discharge;
6) turn-off reversal discharge switch returns the 2nd step.
The magnetic stimulator of reduction power consumption of the present invention and control method thereof, control circuit has been realized control sequential as shown in Figure 3 through its control to forward and reverse charging switches set 2 and forward and reverse discharge switch group 3, thereby realizes positive and negative two-way the discharging and recharging of electric capacity.
With charging voltage 1500V; Electric capacity 100 μ F; Coil inductance is 18 μ H, and this group parameter of resistance 0.15 Ω is an example, adopts the magnetic stimulator and the control method thereof of reduction power consumption of the present invention; Can make the dc source power consumption reduce about 30%, thereby under single stimulation energy same case, can make stimulus frequency improve 40%.
Claims (7)
1. a magnetic stimulator that reduces power consumption includes dc source (8), it is characterized in that, also includes: receive the electric current of dc source (8) and the forward and reverse charging switches set (2) of charging to capacitance group (6); Receive the discharge coil (7) of the discharge current of capacitance group (6) through forward and reverse discharge switch group (3), described discharge coil (7) also sends electric flux to capacitance group (6) through forward and reverse discharge switch group (3); Receive capacitance group (6) voltage signal and with preset forward and reverse voltage comparator circuit (4) that charging voltage compares; Receive the comparison signal of forward and reverse voltage comparator circuit (4), and control the control circuit (1) of forward and reverse charging switches set (2) and forward and reverse discharge switch group (3) respectively through switch driving circuit (5) according to comparative result.
2. the magnetic stimulator of reduction power consumption according to claim 1; It is characterized in that; Described forward and reverse charging switches set (2), forward and reverse discharge switch group (3) comprise a plurality of Large-power High-Speed switch I GBT or controllable silicon; Wherein, first power speed-sensitive switch (A) and second largest power speed-sensitive switch (B) constitute the positive charge switch of capacitance group (6); The third-largest power speed-sensitive switch (C) and the fourth-largest power speed-sensitive switch (D) constitute the reverse charging switch of capacitance group (6); The fifth-largest power speed-sensitive switch (A1) and the sixth-largest power speed-sensitive switch (D1) constitute the forward discharge switch of capacitance group (6); The seventh-largest power speed-sensitive switch (B1) and the eighth-largest power speed-sensitive switch (C1) constitute the back discharge switch of capacitance group (6); Described first input, outfan and the trigger end to the eighth-largest power speed-sensitive switch (A, B, C, D, A1, D1, B1, C1) connects the signal output part of switch driving circuit (5) respectively; The first sampling capacitance voltage (V of capacitance group (6)
01) and the second sampling capacitance voltage (V
02) all be connected to forward and reverse voltage comparator circuit (4).
3. the magnetic stimulator of reduction power consumption according to claim 1; It is characterized in that; Described forward and reverse voltage comparator circuit (4) includes regulator block (S2) and the comparator (S4) that links to each other with regulator block (S2), and the input foot 5 of described comparator (S4) receives the first sampling capacitance voltage (V of capacitance group (6)
01) and the second sampling capacitance voltage (V
02), the outfan foot 2 output voltage (V of comparator (S4)
0) to the input of control circuit (1); Be connected the digital variable resistance R on the Voltage stabilizing module LM317 through adjusting
S1The change datum, thus preset different electric capacity charge voltage.
4. according to the magnetic stimulator of claim 2 or 3 described reduction power consumptions, it is characterized in that the reference ground of described forward and reverse voltage comparator circuit (4) links to each other with the reference ground of dc source through switch.
5. the magnetic stimulator of reduction power consumption according to claim 1 is characterized in that, described switch driving circuit (5) comprises EXB841 chip for driving (S1), the signal input part (V of described EXB841 chip for driving (S1)
2) switch actuating signals of reception control circuit (1) output, three signal output parts (C, E, G) of EXB841 chip for driving (S1) connect the C utmost point, the E utmost point and the G utmost point of each the Large-power High-Speed switch in forward and reverse charging switches set (2) and the forward and reverse discharge switch group (3) respectively.
6. a control method that is used to reduce the magnetic stimulator of power consumption is characterized in that, comprises the steps:
1) initialization setting;
2) conduct positive charge switch carries out positive charge, judges whether charging voltage reaches preset value, is to get into next step, otherwise proceeds positive charge;
3) turn-off the positive charge switch, the conduct positive discharge switch carries out the forward discharge, judges whether to reach the discharge time of setting, is to get into next step, otherwise proceeds the forward discharge;
4) turn-off the forward discharge switch, conducting reverse charging switch carries out reverse charging, judges whether charging voltage reaches preset value, is to get into next step, otherwise proceeds reverse charging;
5) turn-off reversal charge switch, conducting back discharge switch carries out back discharge, judges whether to reach the discharge time of setting, is to get into next step, otherwise proceeds back discharge;
6) turn-off reversal discharge switch returns the 2nd step.
7. the control method that is used to reduce the magnetic stimulator of power consumption according to claim 6; It is characterized in that; Described initialization setting comprises the initial value that presets the charging reference voltage, presets forward and reverse discharge intervalometer, specifies the responsible respectively control output signal of controlling positive charge switch, reverse charging switch, forward discharge switch, back discharge switch of four ports of single-chip microcomputer.
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| CN 200910068408 CN101530650B (en) | 2009-04-09 | 2009-04-09 | Magnetic stimulator for reducing power and control method thereof |
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|---|---|---|---|
| CN 200910068408 CN101530650B (en) | 2009-04-09 | 2009-04-09 | Magnetic stimulator for reducing power and control method thereof |
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| CN101530650B true CN101530650B (en) | 2012-07-04 |
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| CN106442703B (en) * | 2016-09-18 | 2019-06-04 | 中国医学科学院生物医学工程研究所 | A kind of the magnetosonic imaging device and method of the gate alternating electromagnetism excitation reducing power consumption |
| CN109617396B (en) * | 2019-01-04 | 2020-08-04 | 三峡大学 | Circuit structure and method for realizing long service life of electromagnetic forming system based on dual power supplies |
| CN109728627B (en) * | 2019-01-04 | 2022-05-20 | 三峡大学 | Circuit structure and method for realizing long service life of electromagnetic forming system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1751756A (en) * | 2005-10-28 | 2006-03-29 | 天津大学 | Multilead magnetic stimulator for brain |
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2009
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1751756A (en) * | 2005-10-28 | 2006-03-29 | 天津大学 | Multilead magnetic stimulator for brain |
Non-Patent Citations (2)
| Title |
|---|
| 安好,刘志朋,李松,蒲莉娜,殷涛.降低功耗的高频磁刺激仪电路参数优化设计及仿真.《生物医学工程研究》.2009,(第1期),16～20. * |
| 蒲莉娜,殷涛,安好,李松,刘志朋.提高脑神经磁刺激感应电场聚焦性能的线圈参数优化方法的研究.《生物医学工程研究》.2008,(第2 期),74～78. * |
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