CN103311878B - A kind of bipolar electrical stimulation protection device - Google Patents
A kind of bipolar electrical stimulation protection device Download PDFInfo
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- CN103311878B CN103311878B CN201310144411.3A CN201310144411A CN103311878B CN 103311878 B CN103311878 B CN 103311878B CN 201310144411 A CN201310144411 A CN 201310144411A CN 103311878 B CN103311878 B CN 103311878B
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Abstract
The invention discloses a kind of bipolar electrical stimulation protection device, comprise power circuit, control on-off circuit, differential amplifier circuit, current limliting regulating circuit and comparator circuit, control on-off circuit and realize the sampling of signal and the output of control stimulus signal and cut-out; Differential amplifier circuit amplifies the signal controlling on-off circuit sampling; The voltage that sampled signal after comparator circuit amplifies differential amplifier circuit and current limliting regulating circuit input compares, and controls the output that on-off circuit cuts off stimulus signal during comparator circuit output HIGH voltage.When bipolar electrical stimulation is carried out in load (patient); when the electric current flowing through load (patient) exceedes certain current value; direct cut-out bipolar electrical stimulation signal also locks this state, thus stops the output of bipolar electrical stimulation, realizes to patient the protection carrying out effective and safe.It is simple that the present invention has structure, easy to use, the advantage that coefficient of safety is high.
Description
Technical field
The present invention relates to bipolar electrical stimulation Instrument technology field, be specifically related to a kind of bipolar electrical stimulation protection device.
Background technology
Electrostimulation is a kind of conventional physical therapy method, conventional is square wave electrostimulation at present, this is because the rising of square wave current and fall off rate high, wave amplitude can reach maximal stimulus within moment, also zero can be reduced to, and the waveform rule of square wave had both been conducive to grasping stimulus intensity, was also conducive to measurements and calculations.In concrete operations, the wave amplitude of electrostimulation, ripple is wide, string is long, and the index such as program and the time interval all can arbitrarily adjust, and namely it may be used for skin and survey pain, also may be used for the mensuration of peripheral nerve and central nervous system, except producing except pain perception, also produce feeling of numbness.The heat caused in order to minimizing stimulating current of trying one's best and electrolysis, on the impact of organism, under maintenance stimulates effective prerequisite, must shorten the time as much as possible; And bipolar square wave will be adopted to stimulate.The latter's feature is: when positive square wave, ion moves to a direction, immediately and come losing side ripple ion is moved round about, greatly can reduce electrolysis like this.
At present; to electrical stimulation current overload protection; a mainly series connection current sensing resistance in output loop; this resistance obtains the pulse voltage signal be directly proportional to stimulating current; this signal send D/A converter after photoelectric coupling, controller Real-time Collection size of current, when the value that stimulating current sets more than; overload protecting circuit can stop the output of boost pulse combiner circuit, thus the injury that guarantee avoids fortuitous event to cause patient.The effective prerequisite of general electrical stimulation current overload protection is: control software design system works is normal, D/A converter is working properly, current constant control switching tube is working properly; in fact the situation that the generation of this three part is abnormal is very common, therefore will greatly reduce the reliability of its security performance.
Have a kind of electrical stimulation current overload protection arrangement in addition, adopt accurate zero shift current sense amplifier Real-Time Monitoring size of current, control comparator output switching activity below after overcurrent, the cut off circuit consisted of metal-oxide-semiconductor carrys out deenergization.This protective circuit has multiple deficiency:
1, this kind of current overload protection circuit collection is unidirectional square wave, and the square wave stimulus signal being mostly positive negative bipolar of electric stimulating instrument output now, this kind of current foldback circuit cannot carry out collection Bipolar current.
2, the power supply of current overload protection circuit is provided by external power source, and the reliability of circuit just have dropped, if the abnormal then protective circuit of external power source cannot normally work.
What 3, protective circuit adopted the cut-out of electric current is metal-oxide-semiconductor, and this control mode needs to remain on metal-oxide-semiconductor always and applies specific level, the poor reliability of this mode.
What 4, protective circuit adopted the detection of electric current is current sense amplifier, and price is high, and circuit is complicated.
Summary of the invention
The object of the invention is to for above deficiency; a kind of bipolar electrical stimulation overcurrent protective device is proposed; when bipolar square wave bipolar electrical stimulation is carried out in load (patient); when the electric current flowing through load (patient) exceedes certain current value; direct cut-out bipolar electrical stimulation signal also locks this state; thus stop the output of pain bipolar electrical stimulation, the protection carrying out effective and safe is realized to patient.
Object of the present invention is achieved through the following technical solutions:
A kind of bipolar electrical stimulation protection device, it comprises: power circuit, control on-off circuit, differential amplifier circuit, current limliting regulating circuit and comparator circuit, and power circuit is connected with comparator circuit with control on-off circuit, differential amplifier circuit, current limliting regulating circuit respectively; Control on-off circuit for realizing the sampling of bipolar square wave stimulus signal and the output of control bipolar square wave stimulus signal and cut-out, the input controlling on-off circuit connects bipolar square wave stimulus signal; Differential amplifier circuit is connected with control on-off circuit, and the signal controlling on-off circuit sampling is amplified; Current limliting regulating circuit is used for the use needs according to bipolar electrical stimulation device, regulates the Current Control threshold value of overload; The input of comparator circuit connects the output of differential amplifier circuit and the output of current limliting regulating circuit, and the voltage that the sampled signal after amplifying differential amplifier circuit and current limliting regulating circuit export compares; Control on-off circuit to be also connected with comparator circuit, during comparator circuit output HIGH voltage, control the output that on-off circuit cuts off bipolar square wave stimulus signal.
Further optimization, described power circuit converts positive-negative power voltage to a part for bipolar square wave stimulus signal, and for whole bipolar electrical stimulation protection device provides positive-negative power, do not need external power supply, this device just can normally work.
Further optimization, described control on-off circuit comprises rectification silicon bridge, sample resistance, optical coupler, thyristor and triode, rectification silicon bridge first input port is as the input of bipolar square wave stimulus signal, second relative input port is as the output of bipolar square wave stimulus signal, be connected between the third and fourth remaining port of silicon bridge after the collector and emitter of triode and sample resistance series connection, play the effect of switch, if described triode is in cut-off state, then sample resistance place branch road disconnects, bipolar square wave stimulus signal cannot export, the collector electrode of described triode is connected with the collector electrode of the phototriode in described optical coupler, the emitter of triode is connected with the emitter of the phototriode in optical coupler, if the light-emitting diode in optical coupler has illumination to penetrate, phototriode conducting in optical coupler, triode is also with regard to conducting, and bipolar square wave stimulus signal just can output to output, if irradiation that the light-emitting diode in optical coupler is unglazed, the phototriode cut-off in optical coupler, triode is just cut-off also, then sample resistance place branch road disconnects, and bipolar square wave stimulus signal cannot export, light-emitting diode in thyristor and optical coupler is in parallel, if turn on thyristors, then the light-emitting diode in optical coupler flows through with regard to no current, not luminous, and bipolar square wave stimulus signal exports and is truncated.
Further optimization, described control on-off circuit also comprises indicator light, is used to indicate and whether is in over-current state; Indicator light is in parallel with the light-emitting diode in optical coupler, and during lumination of light emitting diode in optical coupler, bipolarity stimulus signal normally exports, and indicator light is bright, is shown as normal operating conditions.
Further optimization, described control on-off circuit also comprises button, and by being connected between the control end of thyristor and ground, after button is pressed, thyristor control end ground connection, thyristor changes cut-off state into by conducting state.
This bipolar electrical stimulation overcurrent protective device, adopts bipolar square wave to change out this stimulation of direct-current power supply protective circuit, does not need external power supply just can normally work.This bipolar electrical stimulation overcurrent protective device employing rectification silicon bridge and sample resistance realize the sampling to bipolar square wave, and no matter are positive level or negative level, and the voltage direction that sampling obtains is consistent.This voltage realizes sampling through differential amplifier circuit, output voltage and the reference voltage of differential amplifier circuit compare in comparator circuit, when exceeding reference voltage, comparator exports high level, thus control turn on thyristors, turn on thyristors controls optical coupler and disconnects, and the disconnection of optical coupler controls again the disconnection of rectification silicon bridge, thus controls the cut-out of stimulus signal.Because thyristor is that control level once inside out just can change conducting into by cut-off state, and also can keep this conducting state after control level is thorough, thus keep the disconnection of bipolar electrical stimulation signal.
This bipolar electrical stimulation overcurrent protective device employing rectification silicon bridge and sample resistance realize the sampling to bipolar square wave, and no matter are positive level or negative level, and the voltage direction that sampling obtains is consistent.Adopt thyristor to control the break-make of optical coupler, the break-make of optical coupler controls again the through and off of rectification silicon bridge, thus controls output and the cut-out of stimulus signal.Because thyristor is that control level once inside out just can change conducting into by cut-off state, and also can keep this conducting state after control level is thorough.Current limliting regulating circuit can according to the Clinical practice needs of different bipolar electrical stimulation device, and the Current Control threshold value of change control overload, to adapt to various different crowd.
In a word; compared with prior art, the present invention has following beneficial effect and advantage: the present invention is one completely independently protective device, easy to use; can use as optional equipment and existing multiple bipolar electrical stimulation equipment connection, the effect of overcurrent protection can be started.The present invention realizes overcurrent protection not by the impact of any other control circuit (containing software), D/A or switching tube; This circuit utilizes square wave stimulus signal to produce positive-negative power, does not also need external power source to provide power supply, and the reliability of work improves.In addition, the switch consisted of thyristor and optical coupler directly cuts off the output of bipolar electrical stimulation signal, and locks next state, and coefficient of safety is high; Have indicator light to indicate whether and be in over-current state, the method for state of resuming work is simple, pushes button.Can according to the Clinical practice needs of different electrostimulation, the Current Control threshold value of change control overload, to adapt to various different crowd.
Accompanying drawing explanation
Fig. 1 is application principle schematic of the present invention.
Fig. 2 is the composition frame chart of bipolar electrical stimulation overcurrent protective device in execution mode.
Fig. 3 is power circuit block circuit diagram in execution mode.
Fig. 4 is the circuit diagram of bipolar electrical stimulation overcurrent protective device in execution mode.
Fig. 5 is positive level stimulus signal transmission schematic diagram.
Fig. 6 is negative level stimulus signal transmission schematic diagram.
Embodiment
Below in conjunction with accompanying drawing and example, enforcement of the present invention is described further, but enforcement of the present invention and protection are not limited thereto.
As shown in Figure 1, bipolar electrical stimulation instrument has two outputs, and bipolar square wave output is first output i.e. the first electrode interface 1, and earth signal is second output i.e. the second electrode interface 2.When originally using, two outputs are respectively connected to an electrode, implement bipolar electrical stimulation to human body.This bipolar electrical stimulation overcurrent protective device is connected between bipolarity bipolar electrical stimulation instrument and two electrode slices, the effect of current-limiting protection can be realized.Method of attachment is: the input IN of this bipolar electrical stimulation overcurrent protective device and the bipolar square wave output of bipolar electrical stimulation instrument i.e. the first electrode interface 1 is connected, and the earth signal end of this bipolar electrical stimulation overcurrent protective device and the ground end of bipolar electrical stimulation instrument i.e. the second electrode interface 2 is connected.Two output OUTA and OUTB of this bipolar electrical stimulation overcurrent protective device are respectively connected to an electrode slice.First output OUTA exports bipolar electrical stimulation signal, when electric current is greater than set point, can cut off the output of bipolar electrical stimulation signal.Second output OUTB is earth signal.
As shown in Figure 2, bipolar electrical stimulation instrument overcurrent protective device is made up of power circuit, control on-off circuit, differential amplifier circuit, current limliting regulating circuit and comparator circuit.The bipolar square wave stimulus signal being input to circuit is divided into two-way, and a road enters power circuit, and another road enters control on-off circuit.Power circuit converts positive-negative power voltage to a part for ambipolar square-wave signal, for whole current-limiting protection circuit provides positive-negative power.Control on-off circuit, utilize rectification silicon bridge to realize two functions, one is the voltage that sampling current changes into sample resistance two ends, and the direction of voltage remains unchanged; Two is the output realization cut-outs to bipolar electrical stimulation signal according to comparator circuit.The voltage controlling sampling resistor two ends in on-off circuit is input in differential amplifier circuit collected, the effect of differential amplifier circuit is, gather sample resistance both end voltage, and the not ohmically electric current of split-stream sampling, because the input resistance of differential amplifier circuit is very high.The voltage that differential amplifier circuit collects is input in comparator circuit, compares with the reference voltage of current limliting regulating circuit, controls the output of comparator.If higher than stop voltage, comparator exports as high, and control signal outputs to and controls, in on-off circuit, to control the output blocking bipolar electrical stimulation signal.The effect of current limliting regulating circuit utilizes slide rheostat to produce adjustable reference voltage, thus change the current limit value of setting.This reference voltage is input in comparator circuit, as the reference voltage of comparator circuit.
As shown in Figure 3, power circuit is by diode (D1, D2), resistance (R1, R2, R3, R4), and electric capacity (C1, C2, C3, C4) and voltage stabilizing didoe (D3, D4) form.In figure; the positive voltage filter circuit (being made up of D1, R1, R3, C1, C2) of square wave, becomes direct voltage positive square wave signal filtering, and the 3rd voltage stabilizing didoe D3 below plays the effect of voltage stabilizing; produce stable positive voltage, this positive supply provides positive supply for current foldback circuit.The wherein negative voltage filter circuit (being made up of D2, R2, R4, C3, C4) of square wave; the signal filtering of losing side ripple is become direct voltage; the 4th voltage stabilizing didoe D4 below plays the effect of voltage stabilizing, produces stable negative voltage, and this negative supply provides negative supply for current foldback circuit.
As shown in Figure 4, control on-off circuit to be made up of rectification silicon bridge, NPN triode Q1, NPN optical coupler U1, resistance (R6, R13), diode (D5, D6, D7), thyristor U3 and button key.Sample resistance R5 is connected to one end of rectification silicon bridge, and connect one end of 10K Europe the 9th resistance R9, the other end of the 9th resistance R9 is connected to the inverting input of amplifier U2A simultaneously.Sample resistance R5 is connected to one end of triode Q1 emitter, and connect one end of 10K Europe the tenth resistance R10, the other end of the tenth resistance R10 is connected to the in-phase input end of amplifier U2A simultaneously.Collector and emitter and the sample resistance R5 of triode Q1 are cascaded, and play the effect of switch, if Q1 disconnects, stimulus signal cannot export.The collector electrode of triode Q1 is connected with the collector electrode of the phototriode in optical coupler, and the emitter of triode Q1 is connected with the emitter of the phototriode in optical coupler.Light-emitting diode in thyristor U3 and optical coupler is in parallel.
As shown in Figure 4, the 8th resistance R8 one end ground connection of differential amplifier circuit, the other end receives the in-phase input end of amplifier, and 10K resistance R10 is connected between inverting input and output.The output of amplifier U2A is connected to the in-phase input end of amplifier U2B,
As shown in Figure 4, current limliting regulating circuit is by the 8th voltage stabilizing didoe D8, and 3.3K Europe resistance R14,51K Europe resistance R11,50K Europe adjustable resistance Rv1 forms.One end ground connection of 50K Europe adjustable resistance Rv1, the other end is connected to one end of 51K Europe resistance R11, and the other end of 51K Europe resistance R11 is connected to one end of 3.3K Europe resistance R14, and the other end of 3.3K Europe resistance R14 is connected to power supply V+.The anode of voltage stabilizing didoe D8 is connected to ground, and negative electrode is connected to the common port of 3.3K Europe resistance R14 and 51K Europe resistance R11.The sliding end of adjustable resistance RV1 is connected to the inverting input of amplifier U2B.The voltage of the sliding end of adjustable resistance RV1 is for limiting size of current set point.Regulate adjustable resistance just can regulate the limit value of bipolar electrical stimulation electric current.
The schematic diagram of the control on-off circuit that Fig. 5 and Fig. 6 is a simplified.The operation principle controlling on-off circuit is described below in conjunction with Fig. 5, Fig. 6.As shown in Figure 5, when the positive level of square wave is come, electric current flows through wherein two diodes (D11 and D13) and sample resistance R5 by the direction of dotted line.Electric current flows through sample resistance R5 from top to down, and ambipolar square wave is come in from the input of IN input, outputs to output OUTB hold through silicon bridge.
As shown in Figure 6, when the negative level of square wave is come, electric current flows through wherein two diode D12 and D14 by the direction of dotted line, and sample resistance R5.Electric current flows through sample resistance R5 from top to down.Ambipolar square wave is come in by the input of IN input, outputs to output OUTB hold through silicon bridge.
The voltage of OUTB output is the pressure drop that the voltage of input IN deducts on the conduction voltage drop of two diodes and sample resistance R5, because sample resistance R5 is very little, the circuit that ambipolar square wave is consisted of this rectification silicon bridge and sample resistance R5, just reduce little amplitude just to hold at output OUTB and export, at OUTB end, what obtain is the bipolar square wave that amplitude slightly reduces a bit.OUTB connects an electrode slice, and earth signal connects another one electrode slice, and these two electrode slices are placed in it patient, can carry out bipolar electrical stimulation.From circuit, can see that the electric current on sample resistance R5 is exactly the electric current flowing through human body, achieve sampling, and be the electric current that the positive level of square wave or negative level produce on sample resistance R5 be all from top to bottom, the voltage of sample resistance R5 upper end, just always higher than lower terminal voltage, so just facilitates amplification below and compares.
From Fig. 5 and Fig. 6, can see if sample resistance R5 place branch road is disconnected, the positive level of square-wave signal cannot arrive OUTB end by this circuit, and the negative level of square-wave signal cannot arrive OUTB end by this circuit, and bipolar electrical stimulation signal cannot export.The principle of Here it is this circuit realiration bipolar electrical stimulation signal cutout.
As shown in Figure 4, collector and emitter and the sample resistance R5 of triode Q1 are cascaded, and play the effect of switch, if Q1 is in cut-off state, then sample resistance R5 place branch road disconnects, and stimulus signal cannot export.The collector electrode of triode Q1 is connected with the collector electrode of the phototriode in optical coupler, the emitter of triode Q1 is connected with the emitter of the phototriode in optical coupler, if the light-emitting diode in optical coupler has illumination to penetrate, phototriode conducting in optical coupler, triode Q1 is also with regard to conducting, and ambipolar square wave stimulus signal just can output to output.If irradiation that the light-emitting diode in optical coupler is unglazed, the phototriode cut-off in optical coupler, triode Q1 is just cut-off also, then sample resistance R5 place branch road disconnects, and stimulus signal cannot export.
As shown in Figure 4, the light-emitting diode in thyristor U3 and optical coupler is in parallel, if thyristor U3 conducting, then the light-emitting diode in optical coupler flows through with regard to no current, not luminous, and stimulus signal exports and is truncated.
Voltage on sample resistance R5 is through differential amplifier circuit, and multiplication factor is 1, and the effect of differential amplifier circuit is, gathers sample resistance both end voltage, and the not ohmically electric current of split-stream sampling, because the input resistance of differential amplifier circuit is very high.The output voltage of differential amplifier circuit and the reference voltage of current limliting regulating circuit compare, if higher than stop voltage, comparator exports as high, turn on thyristors, light-emitting diode then in optical coupler flows through with regard to no current, not luminous, and stimulus signal exports and is truncated.
When thyristor ends, namely electric current does not exceed set point, when bipolar electrical stimulation signal normally exports, and indicator light light-emitting diode D7 bright light.Thyristor U3 and indicator light light-emitting diode D7 is in parallel, and when electric current exceedes set point, turn on thyristors, bipolar electrical stimulation signal is truncated, and indicator light light-emitting diode D7 light on and off, play the effect of indicating operating status.
When electric current exceedes set point, turn on thyristors, when bipolar electrical stimulation signal is truncated, and keep this state, at this moment will rework, as long as push button, thyristor is just cut off, and electrical stimulation signal just recovers to export.
Below, the course of work of whole system is illustrated.The bipolar square wave signal of input, a road is input to power circuit and produces positive-negative power, and this positive-negative power is other module for power supply of whole circuit.The bipolar square wave signal of input, another road enters control on-off circuit, flow through sample resistance R5, namely sample resistance R5 both end voltage size characterizes the size of stimulating current, this sampling voltage is sampled by differential amplifier circuit, then pass in comparator circuit, and the reference voltage that current limliting regulating circuit provides compares.If stimulating current is excessive, namely sample resistance R5 both end voltage is excessive, and namely sampling voltage is excessive, then comparator circuit exports high level.This high level passes to the control end of thyristor U3, makes thyristor U3 conducting.Because the light-emitting diode in thyristor U3 and optical coupler U1 is in parallel, thyristor U3 conducting, the light-emitting diode no current in optical coupler is caused to flow through, phototriode cut-off in optical coupler, triode Q1 is just cut-off also, then sample resistance R5 place branch road disconnects, and stimulus signal cannot export, and locks this state.Thyristor U3 and indicator light light-emitting diode D7 is in parallel, and when electric current exceedes set point, turn on thyristors, bipolar electrical stimulation signal is truncated, and indicator light light-emitting diode D7 light on and off, play the effect of indicating operating status.At this moment will recover the output of stimulus signal, only need the key that pushes button, button key is pressed, and thyristor U3 is set to cut-off.Because the light-emitting diode in thyristor U3 and optical coupler U1 is in parallel, thyristor U3 ends, cause the LEDs ON in optical coupler, electric current is had to flow through, namely illumination is had to be mapped to phototriode in optical coupler, make phototriode conducting, triode Q1 is also with regard to conducting, and ambipolar square wave stimulus signal just can output to output.
Claims (3)
1. a bipolar electrical stimulation protection device, it is characterized in that comprising: power circuit, control on-off circuit, differential amplifier circuit, current limliting regulating circuit and comparator circuit, power circuit is connected with comparator circuit with control on-off circuit, differential amplifier circuit, current limliting regulating circuit respectively; Control on-off circuit for realizing the sampling of bipolar square wave stimulus signal and the output of control bipolar square wave stimulus signal and cut-out, the input controlling on-off circuit connects bipolar square wave stimulus signal; Differential amplifier circuit is connected with control on-off circuit, and the signal controlling on-off circuit sampling is amplified; Current limliting regulating circuit is used for the use needs according to bipolar electrical stimulation device, regulates the Current Control threshold value of overload; The input of comparator circuit connects the output of differential amplifier circuit and the output of current limliting regulating circuit, and the voltage that the sampled signal after amplifying differential amplifier circuit and current limliting regulating circuit export compares; Control on-off circuit to be also connected with comparator circuit, during comparator circuit output HIGH voltage, control the output that on-off circuit cuts off bipolar square wave stimulus signal; Described power circuit converts positive-negative power voltage to a part for bipolar square wave stimulus signal, for whole bipolar electrical stimulation protection device provides positive-negative power; Described control on-off circuit comprises rectification silicon bridge, sample resistance, optical coupler, thyristor and triode, rectification silicon bridge first input port is as the input of bipolar square wave stimulus signal, second relative input port is as the output of bipolar square wave stimulus signal, be connected between the third and fourth remaining port of silicon bridge after the collector and emitter of triode and sample resistance series connection, play the effect of switch, if described triode is in cut-off state, then sample resistance place branch road disconnects, and bipolar square wave stimulus signal cannot export; The collector electrode of described triode is connected with the collector electrode of the phototriode in described optical coupler, the base stage of triode is connected with the emitter of the phototriode in optical coupler, if the light-emitting diode in optical coupler has illumination to penetrate, phototriode conducting in optical coupler, triode is also with regard to conducting, and bipolar square wave stimulus signal just can output to output; If irradiation that the light-emitting diode in optical coupler is unglazed, the phototriode cut-off in optical coupler, triode is just cut-off also, then sample resistance place branch road disconnects, and bipolar square wave stimulus signal cannot export; Light-emitting diode in thyristor and optical coupler is in parallel, if turn on thyristors, then the light-emitting diode in optical coupler flows through with regard to no current, not luminous, and bipolar square wave stimulus signal exports and is truncated.
2. a kind of bipolar electrical stimulation protection device according to claim 1, is characterized in that described control on-off circuit also comprises indicator light, is used to indicate and whether is in over-current state; Indicator light is in parallel with the light-emitting diode in optical coupler, and during lumination of light emitting diode in optical coupler, bipolarity stimulus signal normally exports, and indicator light is bright, is shown as normal operating conditions.
3. a kind of bipolar electrical stimulation protection device according to claim 1 and 2; it is characterized in that described control on-off circuit also comprises button, by being connected between the control end of thyristor and ground, after button is pressed; thyristor control end ground connection, thyristor changes cut-off state into by conducting state.
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| CN104474634B (en) * | 2014-12-12 | 2017-12-12 | 杭州爱司米医疗器械有限公司 | A kind of progressively fine method for preventing electrotherapy signal saturation |
| CN107505858A (en) * | 2017-08-10 | 2017-12-22 | 珠海格力节能环保制冷技术研究中心有限公司 | Control circuit, control method and device, electronic equipment |
| CO2017011756A1 (en) * | 2017-11-17 | 2019-05-21 | Panacea Quantum Leap Tech Llc | Electrical and magnetic tissue stimulation device |
| CN108904973A (en) * | 2018-04-26 | 2018-11-30 | 李珍 | It is a kind of for electrotherapy when protect bio-safety method and equipment |
| CN109861511A (en) * | 2018-12-30 | 2019-06-07 | 惠州华科电器有限公司 | Current foldback circuit and Over Current Protection System |
| CN115421533B (en) * | 2022-10-09 | 2024-02-23 | 奥然生物科技（上海）有限公司 | Electric heating temperature control system with double protection functions |
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