CN1887377A - High voltage discharge circuit with voltage balancing and spike absorbing function for defibrillator - Google Patents
High voltage discharge circuit with voltage balancing and spike absorbing function for defibrillator Download PDFInfo
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- CN1887377A CN1887377A CN 200610088955 CN200610088955A CN1887377A CN 1887377 A CN1887377 A CN 1887377A CN 200610088955 CN200610088955 CN 200610088955 CN 200610088955 A CN200610088955 A CN 200610088955A CN 1887377 A CN1887377 A CN 1887377A
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Abstract
The high voltage generating circuit for defibrillator with voltage balancing and spike absorbing function has one H-bridge circuit, and each of the H-bridge arm has serially connected SCR or IGBT as bridge arm switch. The present invention has no overload failure caused by pulse applied to the circuit, and can absorb spike interference caused the on and off of the switch and release the residual energy in the accumulating capacitor inside the circuit.
Description
Technical field
The present invention relates to a kind of defibrillator high voltage discharge circuit, this discharge circuit realizes that with high pressure H bridge circuit this circuit application produces biphasic defibrillation waveform in external cardiac defibrillator.
Background technology
Ventricular fibrillation is the heart disease that a kind of machinery that causes heart to lose the coordination in normally beating shrinks, and is a kind of to the very big heart disease of life threat.Make the heart of ventricular fibrillation recover normal dancing usual practice and be to use external cardiac defibrillator that heart is carried out strong electrical shock, make the myocardial cell repolarization, get back to phase place separately, restart normally to beat.External cardiac defibrillator causes that at ventricular fibrillation effect is remarkable among the early treatment of sudden death in clinical use for many years.
The strong electrical shock that external cardiac defibrillator is used is to use the high-voltage capacitor storage power, discharges to human body by electrode.High-voltage capacitor appearance value tens is to the hundreds of microfarad, and the highest storage power can reach 400 joules, and voltage reaches several kilovolts.The process of electric shock has only several milliseconds to a few tens of milliseconds.
The tradition defibrillation shock is to adopt the electric capacity unidirected discharge, and discharge process does not have control, and the waveform of defibrillation shock can be very different because of patient's impedance difference, and the effect of defibrillation also is not quite similar, and huge electric current flows through heart and also can cause damage to cardiac muscle.
In recent years, the diphasic pulse defibrillation is more in clinical practice, and diphasic pulse defibrillation technology is controlled in the process of capacitor discharge, and the biphasic defibrillation pulse that makes it to produce puts on patient's heart, compare the high conformity of biphasic defibrillation pulse with the traditional single phase defibrillation.Clinical demonstration, the diphasic pulse defibrillation is defibrillation success rate height not only, and the autonomous recovery rate of patient is also high, and it is all good that recovery survivor's body and nervous function are recovered, also less to induced myocardial injury.
In external defibrillation, use general H bridge circuit generation biphasic defibrillation pulse and also have some problems, because the energy of external defibrillation pulse is bigger, generally all more than 200 joules, so the voltage and current of defibrillation pulse is also very big, voltage is generally up to several kilovolts, the dozens or even hundreds of ampere of electric current.Such pulse is applied on the general H bridge circuit, can make bridge circuit overload and breaks down.
Because the defibrillation process is very fast, generally has only several milliseconds to a few tens of milliseconds, in this process, the switch on the H brachium pontis needs high speed motion, because the spike interference that the high speed break-make of H bridge causes can make circuit become unstable.
Summary of the invention
At the problem of above-mentioned existence, the object of the present invention is to provide a kind ofly to have the balance of voltage and spike and disturb the defibrillator that absorbs with high pressure H bridge circuit, this H bridge circuit can not be applied to because of pulse and make the bridge circuit overload on the circuit and break down.
For achieving the above object, a kind of defibrillator with the balance of voltage and spike interference absorption of the present invention comprises with high voltage discharge circuit: the H bridge circuit, on each brachium pontis of H bridge, connect SCR (thyristor) or IGBT (insulated gate bipolar transistor) as the brachium pontis switch, be parallel with voltage balancing circuit and spike on each brachium pontis switch respectively and disturb the absorption circuit, described voltage balancing circuit is used to prevent that described switch from damaging because of overload, and described spike disturbs the absorption circuit to be used to absorb the spike interference that described switch is produced when opening and closing.
Further, have at least two adjacent brachium pontis to be in series with insulated gate bipolar transistor in the described H bridge as the brachium pontis switch.
Further, described voltage balancing circuit is a balance of voltage resistance.
Further, described spike disturbs to absorb and comprises that spike disturbs absorption electric capacity, spike interference absorption diode and absorbs capacitance current-limiting resistance, absorbing capacitance current-limiting resistance and spike disturbs absorption diode to be in parallel, spike disturbs an end that absorbs electric capacity to link to each other with this parallel circuit input, and spike disturbs the other end and the outfan of this parallel circuit and the switch in parallel on the described H bridge that absorbs electric capacity.
Further, on the switch driving circuit on the described H bridge circuit, also be provided with the overvoltage protection Zener diode, be used to prevent the switch drive overtension and damage switch on the H bridge.
Further, between the brachium pontis of described H bridge, also be connected with internal discharge resistance, be used for energy storage capacitor remnants or no energy are discharged in inside.
Characteristics of the present invention are:
1, placed in-line number of switches is variable on each brachium pontis: can make the volume of product littler according to placed in-line number of switches on the withstand voltage change brachium pontis of brachium pontis, weight be lighter, and cost is lower.
2, have balance of voltage resistance: this balance of voltage resistance makes how many switches of no matter connecting on brachium pontis, as long as the withstand voltage of all switches sum total surpasses the voltage that bears on the brachium pontis, the voltage that bears on each switch can not surpass its withstand voltage.
3, spike disturbs and absorbs circuit: the spike that produces of opening and turn-off that this circuit can absorb because of switch disturbs, and has improved the stability of circuit working.
4, internal discharge function: this circuit can discharge remaining in the energy storage capacitor or no energy in inside.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Fig. 2 is a switch drive buffer circuit sketch map.
Fig. 3 is that a kind of typical spike disturbs the sketch map that absorbs circuit.
The specific embodiment
Series connection a plurality of SCR or IGBT bear highly compressed ability as switch to improve H bridge brachium pontis on each brachium pontis of H bridge, and the quantity of the placed in-line switch of H bridge brachium pontis is many more, and it is strong more that the H bridge bears highly compressed ability.
Realize biphasic defibrillation pulse, need the H bridge in diphasic pulse, can both turn-off fast, because SCR can not turn-off fast, so in this H bridge, will have two adjacent brachium pontis to use the IGBT that can turn-off fast at least.
The parameter of placed in-line each switch and inconsistent on each brachium pontis of H bridge, this can cause when circuit does not discharge, the leakage current difference on each switch, dividing potential drop is inconsistent, and this just may make indivedual SCR or IGBT damage because of overload.Be provided with for this reason each switch is provided with a balance of voltage resistance, can make the dividing potential drop basically identical on each switch, thereby avoided the circuit instability that causes because of the parameter of switch is inconsistent.The electric current that passes through on the balance of voltage resistance can guarantee that much smaller than the leakage current of the permission of energy storage capacitor the energy storage capacitor energy stored can the too fast leakage because being provided with balance of voltage resistance.
This H bridge is to prevent that the spike that the speed-sensitive switch of brachium pontis switch causes from disturbing, and each brachium pontis switch is provided with spike and disturbs and absorb circuit, absorbs spike and disturbs, and has improved the reliability and stability of circuit.
This H bridge need use digital control circuit to control its work, microcontroller circuit is a low-voltage circuit, brachium pontis switch and driving thereof are high-tension circuits, when design, adopt isolation technology that two parts are isolated, make the brachium pontis switch can obtain stable driving voltage, and stoped of the interference of the speed-sensitive switch of brachium pontis switch, further improved the reliability and stability of circuit control circuit.
This H bridge can be selected the quantity of switch on the defibrillation H brachium pontis according to the parameters such as electric current and voltage of the size of defibrillation energy storage capacitor and defibrillation pulse arbitrarily, minimumly can only use a switch on each brachium pontis.Use an amount of switch that this H bridge is being met under the situation of performance requirement, reduce switch quantity, reduced the weight and the cost of H bridge circuit.
This H bridge circuit can be exported 360 joules even more high-octane biphasic defibrillation pulse, is fit to the defibrillation energy storage capacitor of tens microfarads to thousands of microfarads.
This H bridge not only can be used for exporting the biphasic defibrillation pulse more than 200 joules, can also be used to exporting below 200 joules, be low to moderate the biphasic defibrillation pulse of several Joule energies, this low-energy biphasic defibrillation pulse can be used for directly patient's heart being carried out defibrillation when operation.
This H bridge is provided with internal discharge resistance, makes when failing to implement defibrillation after the defibrillation energy storage capacitor is full of electricity, and this H bridge can discharge the energy that stores or do not discharged rapidly, prevents accident.Simultaneously powered-down the time, energy storage capacitor also can discharge by the energy that this circuit will not discharge.
The present invention is described further below in conjunction with accompanying drawing.
As shown in Figure 1, the present invention includes: the H bridge circuit, on each brachium pontis of H bridge, be parallel with n SCR or IGBT as illustrated brachium pontis switch, each brachium pontis switch is parallel with respectively and absorbs the interferential spike interference of spike absorption circuit 27,28,33,34, as shown in Figure 3, this circuit 27,28,33,34 comprise that spike disturbs absorption electric capacity 47, spike disturbs absorption diode 49 and absorbs capacitance current-limiting resistance 48, absorbing capacitance current-limiting resistance 48 disturbs absorption diode 49 to be in parallel with spike, spike disturbs an end that absorbs electric capacity 47 to link to each other with this parallel circuit input, and spike disturbs the other end and the outfan of this parallel circuit and the switch in parallel on the H bridge that absorbs electric capacity 47; Between the brachium pontis of H bridge, also be connected with internal discharge resistance 38, be used for energy storage capacitor remnants or no energy are discharged in inside; Each brachium pontis switch is parallel with balance of voltage resistance 19,20,21,22,23,24,25,26 respectively; as shown in Figure 2; on the switch driving circuit on the H bridge circuit, also be provided with overvoltage protection Zener diode 46, be used to prevent the switch drive overtension and damage switch on the H bridge.
Realize biphasic defibrillation pulse, when the energy storage capacitor 2 in Fig. 1 holds full energy, all K switch 11 (11) of H bridge ... K1n (12), K21 (13) ... K2n (14), K31 (15) ... K3n (16), K41 (17) ... K4n bears high pressure on (18), and the balance of voltage resistance 19,20,21,22,23,24,25,26 that is in parallel with these switches can make the voltage that bears on these switches be no more than the highest withstand voltage of switch.The isolated drive circuit 3 of the H bridge of microcontroller circuit in can control figure 1,4,9,10 open the K switch 11 (11) on first brachium pontis of H bridge ... K switch 41 (17) on K1n (12) and the 4th brachium pontis ... K4n (18), energy storage capacitor 2 begins discharge, the defibrillation electric current flows to electrode 35 from electrode 36 through patient's 37 hearts, the positive defibrillation pulse begins, spike disturbed and absorbed circuit 27 this moment, 28,33,34 work, absorption is because of the K switch on first brachium pontis 11 (11) ... K switch 41 (17) on K1n (12) and the 4th brachium pontis ... K4n (18) opens and the spike that produces disturbs, balance of voltage resistance 21,22,23,24 can make the K switch 21 (13) on second brachium pontis of switch ... K switch 31 (15) on K2n (14) and the 3rd brachium pontis ... dividing potential drop on the K3n (16) is no more than its withstand voltage.After discharge a period of time, the isolated drive circuit 3,4,9,10 of microcontroller circuit control H bridge is closed the K switch 11 (11) on first brachium pontis in the H bridge circuit ... K switch 41 (17) on K1n (12) and the 4th brachium pontis ... K4n (18), energy storage capacitor 2 stops discharge, voltage is maintained, the positive defibrillation pulse finishes, this moment, spike disturbed absorption circuit 27,28,33,34 to work once more, absorbed because of the K switch on first brachium pontis 11 (11) ... K switch 41 (17) on K1n (12) and the 4th brachium pontis ... K4n (18) closes and the spike that produces disturbs.Balance of voltage resistance 21,22,23,24 can make the K switch 21 (13) of bearing this moment on highly compressed second brachium pontis ... K switch 31 (15) on K2n (14) and the 3rd brachium pontis ... the voltage that bears on the K3n (16) is no more than the highest withstand voltage of switch.After a period of time, the isolated drive circuit 5 of microcontroller circuit control H bridge, 6,7,8 open the K switch 21 (13) on second brachium pontis of H bridge ... K switch 31 (15) on K2n (14) and the 3rd brachium pontis ... K3n (16), energy storage capacitor 2 begins discharge, the defibrillation electric current flows to electrode (36) from electrode (35) through patient (37) heart, anti-phase defibrillation pulse begins, spike disturbed and absorbed circuit 29 this moment, 30,31,32 work, absorb because of the K switch on second brachium pontis 21 (13) ... K switch 31 (15) on K2n (14) and the 3rd brachium pontis ... K3n (16) opens and the spike that produces disturbs, balance of voltage resistance 19,20,25,26 can make the K switch 11 (11) of bearing this moment on first brachium pontis of high pressure ... K switch 41 (17) on K1n (12) and the 4th brachium pontis ... dividing potential drop on the K4n (18) is no more than its withstand voltage.After anti-phase discharge a period of time, the isolated drive circuit 3,4 of microcontroller circuit control H bridge, 5,6,7,8,9,10 close all K switch 11 (11) in the H bridge circuit ... K1n (12), K21 (13) ... K2n (14), K31 (15) ... K3n (16), K41 (17) ... K4n (18), energy storage capacitor stop discharge, and anti-phase defibrillation pulse finishes.This moment, spike disturbed absorption circuit 29,30,31,32 to work once more, absorbed because of the K switch on second brachium pontis 21 (13) ... K switch 31 (15) on K2n (14) and the 3rd brachium pontis ... K3n (16) closes and the spike that produces disturbs.Balance of voltage resistance 19,20,21,22,23,24,25,26 can make and bear highly compressed all K switch 11 (11) this moment ... K1n (12), K21 (13) ... K2n (14), K31 (15) ... K3n (16), K41 (17) ... the voltage that bears on the K4n (18) is no more than the highest withstand voltage of switch.So far a biphasic defibrillation pulse produces.
When defibrillator was stopped using, the isolated drive circuit 7,8 of microcontroller circuit control H bridge was opened the K switch 31 (15) on the 3rd brachium pontis of H bridge ... K3n (16) can realize defibrillation energy storage capacitor internal discharge by internal discharge resistance 38.After internal discharge is finished, the isolated drive circuit 3,4 of microcontroller circuit control H bridge, 5,6,7,8,9,10, close all K switch 11 (11) in the H bridge circuit ... K1n (12), K21 (13) ... K2n (14), K31 (15) ... K3n (16), K41 (17) ... K4n (18) can carry out accumulation of energy next time.
As Fig. 2; when needs are opened certain switch such as K11 (11); switch isolation drive circuit microcontroller 39 produces high-frequency impulse; by switch 41 driving transformers 42; the secondary output of transformator 42 converts direct current to through over commutation 43, power filter 44 etc., is transported to switch drive module 45, drives H bridge switch K11 (11); overvoltage protection Zener diode 46 is used for protection switch K11 (11), prevents that the switch drive overtension from damaging K switch 11 (11).When needs are closed switch, as long as switch isolation drive circuit microcontroller 39 stops to produce high-frequency impulse.
As Fig. 3, when producing the spike interference because of certain switch such as K11 (11) action, spike disturbs the circuit that absorbs electric capacity 47 and spike interference absorption diode 49 compositions the spike interference can be absorbed, after K switch 11 (11) is opened, spike disturbs absorption electric capacity 47 the spike interfering energy that absorbs can be discharged by absorbing capacitor discharge resistance 48, absorb the effect that capacitor discharge resistance 48 can play current limliting, prevent from when energy discharges, to produce once more interference.
Claims (6)
1, a kind of defibrillator high voltage discharge circuit with the balance of voltage and spike interference absorption, comprise: the H bridge circuit, it is characterized in that, series connection SCR or IGBT are as the brachium pontis switch on each brachium pontis of H bridge, be parallel with voltage balancing circuit and spike on each brachium pontis switch respectively and disturb the absorption circuit, described voltage balancing circuit is used to prevent that described switch from damaging because of overload, and described spike disturbs the absorption circuit to be used to absorb the spike interference that described switch is produced when opening and closing.
2, a kind of defibrillator high voltage discharge circuit with the balance of voltage and spike interference absorption according to claim 1 is characterized in that having at least two adjacent brachium pontis to be in series with insulated gate bipolar transistor as the brachium pontis switch in the described H bridge.
3, a kind of defibrillator high voltage discharge circuit with the balance of voltage and spike interference absorption according to claim 2 is characterized in that described voltage balancing circuit is a balance of voltage resistance.
4, according to the arbitrary described a kind of defibrillator high voltage discharge circuit of claim 1 to 3 with the balance of voltage and spike interference absorption, it is characterized in that, described spike disturbs the absorption circuit to comprise that spike disturbs absorption electric capacity, spike interference absorption diode and absorbs capacitance current-limiting resistance, absorbing capacitance current-limiting resistance and spike disturbs absorption diode to be in parallel, spike disturbs an end that absorbs electric capacity to link to each other with this parallel circuit input, and spike disturbs the other end and the outfan of this parallel circuit and the switch in parallel on the described H bridge that absorbs electric capacity.
5, a kind of defibrillator high voltage discharge circuit according to claim 4 with the balance of voltage and spike interference absorption; it is characterized in that; on the switch driving circuit on the described H bridge circuit, also be provided with the overvoltage protection Zener diode, be used to prevent the switch drive overtension and damage switch on the H bridge.
6, a kind of defibrillator high voltage discharge circuit according to claim 4 with the balance of voltage and spike interference absorption, it is characterized in that, between the brachium pontis of described H bridge, also be connected with internal discharge resistance, be used for energy storage capacitor remnants or no energy are discharged in inside.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200610088955 CN1887377A (en) | 2006-07-27 | 2006-07-27 | High voltage discharge circuit with voltage balancing and spike absorbing function for defibrillator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200610088955 CN1887377A (en) | 2006-07-27 | 2006-07-27 | High voltage discharge circuit with voltage balancing and spike absorbing function for defibrillator |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101745179A (en) * | 2008-11-28 | 2010-06-23 | 深圳迈瑞生物医疗电子股份有限公司 | Energy release circuit, defibrillator and transforming circuit |
| CN102974037A (en) * | 2012-12-20 | 2013-03-20 | 久心医疗科技（苏州）有限公司 | Defibrillation discharging circuit with self-discharging and multiplexing functions |
| CN103100140A (en) * | 2013-01-17 | 2013-05-15 | 复旦大学 | Defibrillator bridge-type discharge circuit with discharge protection function |
| CN112105110A (en) * | 2020-09-12 | 2020-12-18 | 深圳市维盛泰光电有限公司 | Multipurpose two-wire drive circuit |
| WO2020258280A1 (en) * | 2019-06-28 | 2020-12-30 | 深圳迈瑞生物医疗电子股份有限公司 | Defibrillator |
-
2006
- 2006-07-27 CN CN 200610088955 patent/CN1887377A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101745179A (en) * | 2008-11-28 | 2010-06-23 | 深圳迈瑞生物医疗电子股份有限公司 | Energy release circuit, defibrillator and transforming circuit |
| CN102974037A (en) * | 2012-12-20 | 2013-03-20 | 久心医疗科技（苏州）有限公司 | Defibrillation discharging circuit with self-discharging and multiplexing functions |
| CN102974037B (en) * | 2012-12-20 | 2015-11-11 | 久心医疗科技（苏州）有限公司 | A kind of defibrillation discharge circuit with the multiplexing function of self discharge |
| CN103100140A (en) * | 2013-01-17 | 2013-05-15 | 复旦大学 | Defibrillator bridge-type discharge circuit with discharge protection function |
| CN103100140B (en) * | 2013-01-17 | 2015-03-04 | 复旦大学 | Defibrillator bridge-type discharge circuit with discharge protection function |
| WO2020258280A1 (en) * | 2019-06-28 | 2020-12-30 | 深圳迈瑞生物医疗电子股份有限公司 | Defibrillator |
| CN112867535A (en) * | 2019-06-28 | 2021-05-28 | 深圳迈瑞生物医疗电子股份有限公司 | Defibrillator |
| CN112867535B (en) * | 2019-06-28 | 2024-04-02 | 深圳迈瑞生物医疗电子股份有限公司 | Defibrillation instrument |
| CN112105110A (en) * | 2020-09-12 | 2020-12-18 | 深圳市维盛泰光电有限公司 | Multipurpose two-wire drive circuit |
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Open date: 20070103 |