CN103100140B - Defibrillator bridge-type discharge circuit with discharge protection function - Google Patents
Defibrillator bridge-type discharge circuit with discharge protection function Download PDFInfo
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- CN103100140B CN103100140B CN201310016373.3A CN201310016373A CN103100140B CN 103100140 B CN103100140 B CN 103100140B CN 201310016373 A CN201310016373 A CN 201310016373A CN 103100140 B CN103100140 B CN 103100140B
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Abstract
The invention belongs to the technical field of medical instruments, in particular to a defibrillator bridge-type discharge circuit with a discharge protection function. The defibrillator bridge-type discharge circuit comprises a bridge-type discharge circuit body, a short circuit and direct connection prevention circuit and/or an overcurrent sampling circuit, a logic control circuit and a switch drive module. According to the bridge-type discharge circuit body, two passages are composed of four electronic switches, the electronic switches at the diagonal positions are turned on simultaneously to form one passage, and the two passages are in a conducting state alternately to form the bridge-type discharge circuit body. The short circuit and direct connection prevention circuit is used for realizing mutual locking of the electronic switches through two NOR gates and preventing short circuit and direct connection from happening to the electronic switches in the discharge circuit body. The overcurrent sampling circuit collects the current of the discharge circuit body, and outputs and controls turn-on and turn-off states of the electronic switches. The logic control circuit is used for realizing joint control of the electronic switches by the short circuit and direct connection prevention circuit and the overcurrent sampling circuit through two NAND gates. The switch drive module is an optocoupler integrated circuit used for realizing isolation of a high-voltage circuit and a low-voltage circuit and can directly drive the electronic switches.
Description
Technical field
The invention belongs to Medical Instruments technical field, be specifically related to a kind of defibrillator bridge-type discharge circuit with discharge prevention function, can prevent discharge circuit short circuit from leading directly to and achieving overcurrent protection, can be used for the high electric field pulse output circuit in defibrillator.
Background technology
Ventricular fibrillation is arrhythmia the most pernicious, and electric defibrillation is the mode of the most effective termination ventricular fibrillation at present.At present comparatively general defibrillation waveform is two-phase truncation exponential wave, generally first by electrical power storage on bulky capacitor, whether electrical switch controls to discharge, and namely capacitor discharge waveform is exponential waveform.Bi-phase wave is realized by bridge-type discharge circuit, and the combination and the turn-on sequence that control electrical switch can form bridge-type discharge circuit.
In the defibrillation procedure of reality, there are high voltage and big current to produce, careless slightlyly will cause heavy losses, gently then damage defibrillator, heavy then jeopardize the health and lives of patient and defibrillator operation person.So the safety and stability of defibrillation discharge circuit just seems particularly important.Namely the present invention is the design protection to bridge-type discharge circuit invented based on above-mentioned starting point, prevents discharge circuit short circuit from leading directly to and achieving overcurrent protection.
Summary of the invention
Based on the consideration to defibrillator discharge circuit safety and stability, the present invention devises a kind of defibrillator bridge-type discharge circuit with discharge prevention function, and against short-circuit is straight-through and achieve overcurrent protection.Straight-through the referring to of against short-circuit prevents bridge-type discharge circuit load direct conducting by electrical switch short circuit; Fast shut-off discharge circuit when the electric current that overcurrent protection refers to when discharge circuit is greater than a certain threshold value.
The defibrillator bridge-type discharge circuit with discharge prevention function provided by the invention, comprises four parts: bridge-type discharge circuit, against short-circuit direct circuit and/or overcurrent sample circuit, logic control circuit, and switch drive module.Wherein, bridge-type discharge circuit is made up of four electrical switches, forms two-way path, and wherein, the electrical switch conducting simultaneously of diagonal positions forms a-road-through road, and two-way path alternate conduction forms bridge-type discharge circuit; Against short-circuit direct circuit realizes the interlocking of electrical switch by two nor gates, prevents electrical switch short circuit in discharge circuit from leading directly to; Overcurrent sample circuit gathers the electric current of discharge circuit, and it exports the conducting and shutoff that control electrical switch; Logic control circuit realizes against short-circuit direct circuit and overcurrent sample circuit to the co-controlling of electrical switch by two NAND gate; Switch drive module is an optocoupler integrated circuit, realizes the isolation of high-tension circuit and low-voltage circuit, and can Direct driver electrical switch.
The present invention completes two kinds of discharge prevention functions simultaneously, and namely against short-circuit leads directly to and achieves overcurrent protection.Bridge-type discharge circuit and switch drive module are that two kinds of defencive functions are common, and both are finally merged by logic control circuit, realize the common protection to discharge circuit by independent design against short-circuit direct circuit and overcurrent sample circuit.
Described bridge-type discharge circuit is made up of four electrical switches altogether, the output of the control termination switch drive module of four electrical switches, the first electrical switch and the 3rd electrical switch composition Qiao Lu side, the second electrical switch and the 4th electrical switch composition bridge road opposite side.Both sides path is arranged axisymmetricly, one termination high voltage power supply of the first electrical switch, one end of another termination the 3rd electrical switch, one termination high voltage power supply of the second electronic cutting 2, one end of another termination the 4th electrical switch, the other end of the 3rd electrical switch connects with the other end of the 4th electrical switch.A defibrillation electrode is connected on the junction of the first electrical switch and the 3rd electrical switch, and another defibrillation electrode is connected on the junction of the second electrical switch and the 4th electrical switch.The electrical switch conducting simultaneously of diagonal positions, i.e. the first electrical switch and the conducting simultaneously of the 3rd electrical switch, or second electrical switch and the 4th electrical switch conducting simultaneously, form two-way discharge circuit, two-way discharge circuit alternate conduction, namely bridge-type discharge circuit (this circuit can see patent " being applicable to the high-voltage pulse generating circuit of external defibrillator ", patent No. ZL200720074627.7) is achieved.
About against short-circuit direct circuit, in the control to bridge-type discharge circuit, first must ensure the Control timing sequence on same bridge road synchronous, then two road and bridge road conductings simultaneously will be prevented, the output of traditional microcontroller is by programmer's software control, the unpredictable situations such as program fleet may be there is, so the present invention with the addition of one-level interlock circuit before the output of microcontroller and bridge-type discharge circuit drive, this interlock circuit can not export high level simultaneously, avoids the situation of two-way discharge circuit conducting simultaneously.
About overcurrent sample circuit, the sampling resistor be connected in discharge circuit gathers passage current, the negative-phase input of the voltage access voltage comparator at sampling resistor two ends, the reference comparison voltages of voltage comparator is obtained insulating power supply voltage by two divider resistance R2 and R3, its numerical value is determined by the ratio of insulating power supply voltage and divider resistance R2 and R3, finally accesses the normal phase input end of voltage comparator.In addition, logic gates is positioned at low-voltage circuit district, and overcurrent sample circuit is positioned at high voltage circuit area, so optocoupler must be adopted both to be isolated.
Logic control circuit is realized by two NAND gate, and its function realizes against short-circuit direct circuit to the co-controlling of overcurrent sample circuit to discharge circuit, when only need realize wherein a kind of function time, logic control circuit is optional.
About switch driving circuit, can designed, designed drive circuit, also can adopt switch drive module.For the consideration to stability and reliability and circuit complexity, this utility model have employed commercially available switch drive module.This module can directly be controlled by the output of gate, simultaneously can Direct driver electrical switch.
Accompanying drawing explanation
Fig. 1 circuit general diagram.
Fig. 2 bridge-type discharge circuit.
Fig. 3 against short-circuit direct circuit.
Fig. 4 overcurrent sample circuit.
Fig. 5 logic control circuit.
Fig. 6 switch drive module.
Detailed description of the invention
Present embodiments provide a kind of implementation with the defibrillator bridge-type discharge circuit of discharge prevention function, the program can prevent discharge circuit short circuit from leading directly to and achieving overcurrent protection.According to the analysis introduction of summary of the invention, a kind of optimal way is selected to be explained herein.Detailed description of the invention is as follows:
The electrical switch that the present embodiment adopts is IGBT, is first briefly described IGBT.IGBT is insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT) abbreviation, the compound full-control type voltage driven type semiconductor device be made up of double pole triode (BJT) and metal oxide semiconductor field effect tube (MOSFET), have the advantage of low and fast two aspects of MOSFET driving power P cock speed of the input impedance height conduction voltage drop of BJT concurrently, be applicable to very much the on-off control being applied to high direct voltage.
Fig. 1 is circuit general diagram of the present invention.For a discharge circuit for external defibrillator, can prevent the short circuit of IGBT from leading directly to and achieving overcurrent protection.This block diagram comprises four parts, bridge-type discharge circuit, overcurrent sample circuit, logic control circuit and IGBT drive module.Bridge-type discharge circuit forms two-way path by four IGBT, and while the IGBT of lateral symmetry position, conducting achieves bridge-type discharge circuit.Overcurrent sample circuit gathers the electric current of discharge circuit, and it exports conducting and the shutoff of control IGBT.Logic control circuit realizes the interlocking of IGBT by two nor gates, prevents the short circuit of IGBT in IGBT discharge circuit from leading directly to, and the output of interlock circuit and the output of overcurrent sample circuit access two NAND gate, the driver module of control IGBT.IGBT drive module is an optocoupler integrated circuit, can Direct driver IGBT.
Fig. 2 is bridge-type discharge circuit of the present invention.This bridge-type discharge circuit is made up of four IGBT altogether, IGBT1 and IGBT2 forms Qiao Lu side, IGBT3 and IGBT4 forms bridge road opposite side.Both sides path is arranged axisymmetricly, the colelctor electrode of IGBT1 meets high voltage power supply HighVoltage, the emitter stage of IGBT1 connects the colelctor electrode of IGBT3, the colelctor electrode of IGBT2 meets high voltage power supply HighVoltage, the emitter stage of IGBT2 connects the colelctor electrode of IGBT4, the emitter stage of IGBT3 is connected with the emitter stage of IGBT4, and connects with one end of sampling resistor R1 simultaneously, and the grid of all IGBT drives by IGBT drive module.Defibrillation electrode E1 and E2 is connected on the emitter stage of IGBT1 and the emitter stage of IGBT2 respectively.Diagonal positions IGBT conducting simultaneously; i.e. IGBT1 and IGBT3 conducting simultaneously; or IGBT2 and IGBT4 conducting simultaneously; two groups of discharge circuit alternate conduction; defibrillation current flow flows through IGBT1, defibrillation electrode, IGBT4 and sampling resistor R1 to floating respectively from high voltage power supply HighVoltage; or flow through IGBT2, defibrillation electrode, IGBT3 and sampling resistor R1 to floating ground; namely bi-phase wave pulse bridge discharge circuit (this feature is protected by patent " being applicable to the high-voltage pulse generating circuit of external defibrillator ", patent No. ZL200720074627.7) is achieved.
Fig. 3 is against short-circuit direct circuit of the present invention.This against short-circuit direct circuit is made up of two nor gate U1 and U2.Two nor gate U1 and U2 are combined into rest-set flip-flop, and two output control terminals of microcontroller connect R and the S input of rest-set flip-flop respectively.The output of this rest-set flip-flop can not be 1 simultaneously, can prevent the conducting simultaneously of rear end IGBT two-way path.List truth table, be specially, as bridge road 1(Bridge1) control signal=0 and bridge road 2(Bridge2) control signal=1 time, export Q1=1 and Q2=0; When control signal=1, bridge road 1 and 2 control signal=0, bridge road, export Q1=0 and Q2=1; When control signal=1, bridge road 1 and 2 control signal=1, bridge road, export Q1=0 and Q2=0; When control signal=0, bridge road 1 and 2 control signal=0, bridge road, export Q1 and Q2 and remain unchanged.The present embodiment does not use the situation of control signal=0, bridge road 1 and control signal=0, bridge road 2.
Fig. 4 is overcurrent sample circuit of the present invention.Passage current is gathered by the sampling resistor R1 be connected in IGBT discharge circuit, the negative-phase input of the voltage access voltage comparator U3 at sampling resistor R1 two ends, the reference comparison voltages of voltage comparator U3 is obtained insulating power supply voltage (VCC_Float) by two divider resistance R2 and R3, its numerical value is determined by the ratio of insulating power supply voltage VCC_Float and divider resistance R2 and R3, finally accesses the normal phase input end of voltage comparator U3.Voltage comparator U3 exports low and high level signal, and this low and high level signal drives optocoupler U4, and optocoupler U4 exports the low and high level signal over-current signal (OverCurrent) of same polarity.When passage current is lower than a certain threshold value, the voltage at sampling resistor R1 two ends is lower than the reference voltage of voltage comparator U3, and voltage comparator U3 exports as high level, and the output of optocoupler U4 is identical with inputting polarity, also exports high level.When passage current is higher than a certain threshold value, the voltage at sampling resistor R1 two ends is higher than the reference voltage of voltage comparator U1, and voltage comparator U3 exports as low level, and the output of optocoupler U4 is identical with inputting polarity, also output low level.Optocoupler U4 described herein is used for isolated high-voltage circuit and low-voltage circuit, the output signal over-current signal (OverCurrent) of overcurrent sample circuit is converted to the input signal of NAND gate U5 and U6 in logic control circuit.
Fig. 5 is logic control circuit of the present invention.This logic control circuit is made up of two NAND gate U5 and U6.In Fig. 3, the two-way of against short-circuit direct circuit exports Q1 and Q2 and accesses two NAND gate U5 and U6 with the output (OverCurrent) of overcurrent sample circuit in Fig. 4 respectively, IGBT drive module is finally accessed in output bridge road 1 drive singal (Bridge1Ctrl) and the bridge road 2 drive singal (Bridge2Ctrl) of two NAND gate U5 and U6, control the IGBT on bridge road 1 and bridge road 2 respectively, only corresponding when the output of microcontroller is 1 with the output of overcurrent sample circuit simultaneously IGBT just opens.
Fig. 6 is switch drive module of the present invention, is IGBT drive module herein.This IGBT drive module is optocoupler integrated circuit, can directly be controlled by the output of logic control circuit, and can Direct driver IGBT, realizes the isolation of high-tension circuit and low-voltage circuit simultaneously.Four IGBT are driven by four driver modules respectively.
Comprehensive above-mentioned embodiment, when discharge circuit does not have overcurrent, the output overcurrent signal (OverCurrent) of overcurrent sample circuit is 1, now output Q1 and Q2 of two NAND gate U5 and U6 to two nor gate U1 and U2 is enable, IGBT1 and IGBT4 can be opened, Ji Qiao road 1 conducting in control signal=0, bridge road 1 and control signal=1, bridge road 2; IGBT2 and IGBT3 can be opened, Ji Qiao road 2 conducting in control signal=1, bridge road 1 and control signal=0, bridge road 2; Control signal=1, bridge road 1 and control signal=1, bridge road 2 can turn off all bridge-type discharge circuits.When discharge current is greater than a certain threshold value, the output overcurrent signal (OverCurrent) of overcurrent sample circuit is 0, and now two NAND gate U5 and U6 will shield Q1 and Q2, turns off all bridge-type discharge circuits simultaneously, namely achieves overcurrent protection.
Above; be only preferred embodiment of the present invention, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, within the protection domain that all should be encompassed in invention.Therefore, with claims, protection scope of the present invention should require that the protection domain defined is as the criterion.
Claims (6)
1. there is a defibrillator bridge-type discharge circuit for discharge prevention function, it is characterized in that, be made up of following several part: bridge-type discharge circuit, against short-circuit direct circuit and overcurrent sample circuit, logic control circuit, and switch drive module; Wherein,
Described bridge-type discharge circuit forms two-way path by four electrical switches, and the electrical switch conducting simultaneously of diagonal positions forms a-road-through road, and two-way path alternate conduction forms bridge-type discharge circuit;
Described against short-circuit direct circuit is combined into rest-set flip-flop by two nor gates, two output control terminals of microcontroller connect R and the S input of rest-set flip-flop respectively, the two-way of trigger exports the turn-on and turn-off controlling two-way electrical switch respectively, export high level when this rest-set flip-flop is different, two-way electrical switch conducting simultaneously in discharge circuit can be prevented;
Described overcurrent sample circuit gathers the electric current of discharge circuit, and it exports the conducting and shutoff that control electrical switch;
Described logic control circuit realizes against short-circuit direct circuit and overcurrent sample circuit to the co-controlling of electrical switch by two NAND gate;
Described switch drive module is an optocoupler integrated circuit, realizes the isolation of high-tension circuit and low-voltage circuit, and for Direct driver electrical switch.
2. the defibrillator bridge-type discharge circuit with discharge prevention function according to claim 1, it is characterized in that, described bridge-type discharge circuit, this bridge-type discharge circuit is made up of four electrical switch IGBT altogether, electrical switch IGBT1 and electrical switch IGBT2 forms Qiao Lu side, and electrical switch IGBT3 and electrical switch IGBT4 forms bridge road opposite side; Both sides path is arranged axisymmetricly, the colelctor electrode of electrical switch IGBT1 meets high voltage power supply HighVoltage, the emitter stage of electrical switch IGBT1 connects the colelctor electrode of IGBT3, the colelctor electrode of electrical switch IGBT2 meets high voltage power supply HighVoltage, the emitter stage of electrical switch IGBT2 connects the colelctor electrode of electrical switch IGBT4, the emitter stage of electrical switch IGBT3 is connected with the emitter stage of electrical switch IGBT4, and connect with one end of sampling resistor R1, the grid of all electrical switches drives by IGBT drive module; simultaneously Defibrillation electrode E1 and E2 is connected on the emitter stage of electrical switch IGBT1 and the emitter stage of electrical switch IGBT2 respectively; Diagonal positions IGBT conducting simultaneously, i.e. electrical switch IGBT1 and electrical switch IGBT3 conducting simultaneously, or electrical switch IGBT2 and electrical switch IGBT4 conducting simultaneously, two groups of discharge circuit alternate conduction, defibrillation current flow flows through electrical switch IGBT1, defibrillation electrode, electrical switch IGBT4 and sampling resistor R1 to floating respectively from high voltage power supply HighVoltage, or flow through electrical switch IGBT2, defibrillation electrode, electrical switch IGBT3 and sampling resistor R1 to floating ground, namely achieve bi-phase wave pulse bridge discharge circuit.
3. the defibrillator bridge-type discharge circuit with discharge prevention function according to claim 1; it is characterized in that; described overcurrent sample circuit gathers passage current by the sampling resistor be connected in discharge circuit; the negative-phase input of the voltage access voltage comparator at sampling resistor two ends; voltage comparator exports low and high level signal; this low and high level signal drives optocoupler, and optocoupler exports the low and high level signal of same polarity.
4. the defibrillator bridge-type discharge circuit with discharge prevention function according to claim 1; it is characterized in that; the output of described against short-circuit direct circuit and the output access logic control circuit of described overcurrent sample circuit; logic control circuit is made up of two NAND gate; the output of two NAND gate accesses switch drive module corresponding to bridge-type discharge circuit respectively, realizes against short-circuit direct circuit and current foldback circuit to the co-controlling of electrical switch.
5. the defibrillator bridge-type discharge circuit with discharge prevention function according to claim 1; it is characterized in that; in overcurrent sample circuit; the reference comparison voltages of voltage comparator is obtained insulating power supply voltage by two divider resistance R2 and R3; its numerical value is determined by the ratio of insulating power supply voltage and divider resistance R2 and R3, finally accesses the normal phase input end of voltage comparator.
6. the defibrillator bridge-type discharge circuit with discharge prevention function according to claim 1; it is characterized in that; in overcurrent sample circuit; described optocoupler is used for isolated high-voltage circuit and low-voltage circuit, the output signal of overcurrent sample circuit is converted to the input signal of NAND gate in logic control circuit.
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| CN201310016373.3A CN103100140B (en) | 2013-01-17 | 2013-01-17 | Defibrillator bridge-type discharge circuit with discharge protection function |
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| CN103100140B true CN103100140B (en) | 2015-03-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105251123A (en) * | 2015-10-16 | 2016-01-20 | 安科乐康（北京）诊断技术有限公司 | Discharge protection circuit used for automated external defibrillator, and automated external defibrillator |
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| CN103475258B (en) * | 2013-09-09 | 2016-08-17 | 河海大学常州校区 | The high-voltage pulse power source of adjustable discharge parameter |
| CN104587602B (en) * | 2015-01-13 | 2017-01-11 | 深圳市科曼医疗设备有限公司 | Defibrillating discharge protection system and medical equipment |
| CN108992780A (en) * | 2018-08-01 | 2018-12-14 | 乐普医学电子仪器股份有限公司 | A kind of defibrillator bridge-type discharge circuit accurately controlling turn on process |
| CN109966644B (en) * | 2019-03-21 | 2023-05-12 | 百纳川医疗科技(苏州)有限公司 | Discharge protection circuit for defibrillator, defibrillator discharge system and defibrillator |
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