CN101461983A - Voltage-regulating converter for power of defibrillation and pacing apparatus - Google Patents
Voltage-regulating converter for power of defibrillation and pacing apparatus Download PDFInfo
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- CN101461983A CN101461983A CNA2007100773531A CN200710077353A CN101461983A CN 101461983 A CN101461983 A CN 101461983A CN A2007100773531 A CNA2007100773531 A CN A2007100773531A CN 200710077353 A CN200710077353 A CN 200710077353A CN 101461983 A CN101461983 A CN 101461983A
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Abstract
The invention relates to a buck-boost converter used in a defrillating and pacing power supply, which comprises a flyback converter, a PWM controller which is operated in a mode of critical current, an adjustable constant-current source and an isolated feedback circuit, wherein the flyback converter is used for realizing voltage change; the adjustable constant-current source is used for converting control voltage into a current control signal which is proportional with the control voltage; two input ends of the isolated feedback circuit are connected with a voltage output end of the flyback converter and the current control signal respectively; output voltage of the flyback converter is overlaid with the current control signal, and adjusting voltage is outputted and acts on a feedback voltage end of the PWM controller which is operated in the mode of critical current; and the PWM controller controls the switch-on time of a switch tube of the flyback converter according to the adjusting voltage and drives output voltage of the flyback converter to change. The buck-boost converter realizes isolation of input and output of the converter; the output voltage can be continuously changed within a large range lower than or higher than input voltage; and the control voltage VC and the output voltage form a linear proportional control relation.
Description
Technical field
The present invention relates to the power supply buck-boost converter, relate in particular to a kind of buck-boost converter that is used for defibrillation pace-making power supply.
Background technology
Defibrillation monitor has the noinvasive pacing function, can apply electricity irritation by the electrode on patient's chest surface, and the bradycardia after the defibrillation is carried out emergency treatment.For the defibrillation pace-making, need be applied to the voltage controlled (being controlled Control of Voltage) on the electrode, and one adjustable continuously in a big way, promptly in its range of accommodation, output voltage may be higher or lower than input voltage.Because electrode directly acts on human body, the output voltage that is applied on the electrode needs and the input voltage isolation, guarantees safe in utilization.
At present, the implementation of wide output voltage mainly adopts the BUCK-BOOST changer, and this changer both can be realized boost function, can realize buck functionality again.Fig. 1 is a kind of BUCK-BOOST circuit, and Q1, Q2 open simultaneously or turn-off simultaneously in this changer.When input voltage was higher than output voltage, the effect of Q1 was the same with the BUCK switch, and D1 makes fly-wheel diode.When Q1, Q2 opened simultaneously, input voltage was added to the inductance two ends, and inductive current rises; When Q1, Q2 turn-offed simultaneously, inductive current was changed on the D1, and the automatic forward conduction of D2 is identical with BUCK changer mode of operation.When input voltage was lower than output voltage, the effect of Q2 was similar to flyback switching, and same Q1, Q2 be turn-on and turn-off simultaneously, and during shutoff, inductive current is changed on the D2, the automatic conducting of D1.Thereby can realize boost function.Identical main circuit without working mode change, not only can be realized boost function but also can realize buck functionality, by adjusting control voltage, finishes the output of wide-range voltage.
But in defibrillation pace-making applied environment, adopt the BUCK-BOOST changer of existing technology, have following shortcoming:
1) main circuit can not be realized the isolation of input and output, and the input and output of BUCK-BOOST circuit can not be satisfied the necessary isolated requirement of pace-making power supply input and output altogether.
2) though BUCK-BOOST can realize bigger output voltage range, but when the output voltage excursion is big, such as when output changes from 10V to 150V, circuit can be changed between discontinuous current pattern, electric current critical conduction mode and continuous current mode, therefore, it is very difficult that changer loop stability Design becomes, and can not guarantee that under three kinds of mode of operations, circuit all is stable.
3) drive circuit complexity.Need 2 switching tube Q1, Q2 in the circuit, Q1 need adopt flash to drive, Q2 adopts low limit to drive, usually adopt the gate-drive transformator to realize, increased step, cost and the complexity of drive circuit, the more important thing is, because driving transformer needs resetting time, make the maximum duty cycle of circuit be restricted, output voltage is restricted simultaneously.
Therefore, because there is above-mentioned defective in prior art, need provide a kind of buck-boost converter that is applicable in the defibrillation pace-making power supply.
Summary of the invention
Technical problem to be solved by this invention is: a kind of buck-boost converter that is applicable in the defibrillation pace-making power supply is provided.This buck-boost converter can be depressed at certain input dc power, and by control voltage, realization is below or above the continuous output voltage of the wide variation of input voltage, and input and output are isolated mutually.
The present invention solves the problems of the technologies described above the technical scheme that is adopted to be:
A kind of buck-boost converter that is used for defibrillation pace-making power supply comprises an anti exciting converter, a PWM controller, and isolation feedback circuit,
In the described anti exciting converter behind the former limit winding of the transformator serial connection switching tube as the input of this anti exciting converter, behind its secondary winding serial connection commutation diode as the outfan of this anti exciting converter;
One input of described isolation feedback circuit connects described anti exciting converter outfan, its another input termination one control signal, described isolation feedback circuit is used for the sampled signal of anti exciting converter output voltage and described control signal are superposeed, and exports one and adjust the feedback voltage end that voltage acts on described PWM controller; Described PWM controller changes the anti exciting converter output voltage according to this ON time of adjusting the described switching tube of Control of Voltage.
Described buck-boost converter, wherein: described control signal is a current controling signal, and described buck-boost converter also comprises an adjustable constant-flow source, described adjustable constant-flow source is used for a control voltage transitions is become proportional with it described current controling signal, makes anti exciting converter output voltage and described control voltage linear.
Described buck-boost converter, wherein: described PWM controller is the PWM controller that is operated in the critical current pattern, include the zero current detection end, its gate signal outfan connects described control end of switching tube, and its feedback voltage end connects described isolation feedback circuit outfan; Described buck-boost converter also comprises a zero current detection circuit, be used to detect the electric current of described commutation diode of flowing through, and when the electric current of the described commutation diode of flowing through is zero, provide zero-signal and act on described zero current detection end, be used for the output that set again is operated in the PWM controller of critical current pattern, make described switching tube begin the conducting of new one-period.
Described buck-boost converter, wherein: described zero current detection circuit comprises an auxiliary winding and detects resistance, one end of described auxiliary winding connects described zero current detection end through described detection resistance, its other end ground connection, described auxiliary winding by with the coupling of described secondary winding, obtain and the proportional boost voltage of described output voltage, when the electric current of the described commutation diode of flowing through is zero, described boost voltage drops to zero, and acting on the zero current detection end by described detection resistance is zero-signal.
Described buck-boost converter, wherein: described isolation feedback circuit comprises a photo-coupler, three-terminal voltage regulator, and sample circuit; Described sample circuit comprises the 4th and the 3rd resistance, and the two is serially connected between anti exciting converter output voltage terminal and the ground, and the 3rd resistance is sample resistance; Described three-terminal voltage regulator is serially connected between the light-emitting diodes tube cathode and ground of photo-coupler, and it adjusts the node of end connection the described the 4th and the 3rd resistance, and the photocell of described photo-coupler is exported described adjustment voltage.
Described buck-boost converter, wherein: described adjustable constant-flow source comprises an error amplifier, and electric current adjustment pipe, the positive input terminal of described error amplifier applies described control voltage, its negative input end links to each other after second resistance eutral grounding with the emitter-base bandgap grading that described electric current is adjusted pipe, its outfan connects the control end that described electric current is adjusted pipe through the 5th resistance, and the colelctor electrode of described electric current adjustment pipe connects the node of described isolation feedback circuit the 4th and the 3rd resistance.
Beneficial effect of the present invention is: buck-boost converter of the present invention is because main circuit is anti exciting converter (a FLYBACK changer), realized the isolation between the input and output, guaranteed the safety of system, and because the FLYBACK changer only needs a switching tube, can adopt low limit to drive, the PWM controller does not need the outer circuit of plus, can directly drive, circuit is simple and reliable, and output voltage can be below or above changing continuously of input voltage on a large scale.
Work in the critical current mode of operation because of FLYBACK changer of the present invention again, compare with the fixed switching frequency mode of operation, under identical power conditions, because the critical current mode of operation does not have Dead Time, its peak point current is lower, and the power consumption of circuit is lower, and under the bigger situation of output voltage excursion, owing to only there is a kind of critical current mode of operation, the stability of changer loop is more directly simple, is convenient to the circuit stability design.
The present invention simultaneously realizes the linear scale control relation of control voltage to output voltage owing to adopt the adjustable constant-flow source to adjust output voltage, can improve the adjustment precision of output voltage.
Description of drawings
Fig. 1 is the BUCK-BOOST circuit theory diagrams of prior art;
Fig. 2 is a buck-boost converter theory diagram of the present invention;
Fig. 3 is the schematic diagram of buck-boost converter specific implementation of the present invention;
Fig. 4 is isolation feedback circuit of the present invention and adjustable current source schematic diagram.
The specific embodiment
With embodiment the present invention is described in further detail with reference to the accompanying drawings below:
Shown in Fig. 2,3, buck-boost converter of the present invention comprises 4 partial circuits, is respectively anti exciting converter (FLYBACK changer), PDM keyer (PWM controller), isolation feedback circuit (Isolated Feedback) and adjustable current source.
The FLYBACK changer comprises transformator T1, switching tube Q2, commutation diode D1 and capacitor C 1, behind the former limit of the transformator winding N1 serial connection switching tube Q2 as the input of FLYBACK changer, as the outfan of this FLYBACK changer, capacitor C 1 is connected in parallel on the FLYBACK converter output terminal behind its secondary winding of transformator N2 serial connection commutation diode D1.The FLYBACK changer is as the main circuit of lifting changer of the present invention, in order to realize the electrical isolation between voltage transformation and the input and output.
The closed loop control of isolation feedback circuit in order to realize exporting and importing, and reach the isolated purpose of safety.Isolation feedback circuit has two inputs and an outfan, and wherein an input connects the output voltage VO UT end of FLYBACK changer, another input termination one control signal, and this control signal can be a voltage control signal, also can be current controling signal.The operation principle of isolation feedback circuit is that the feedback voltage end (FB end) that voltage acts on the PWM controller was adjusted in output one after FLYBACK changer output voltage sampled signal and control signal were carried out overlap-add procedure, the FB terminal voltage of adjustment PWM controller.And the FB terminal voltage of PWM controller has directly determined the ON time ton of switching tube Q2, the transformator T1 storage power of FLYBACK changer during the Q2 conducting, when Q2 ends, transformator T1 energy stored is sent to capacitor C 1 and load through D1, and winding N2 goes up voltage and is approximately equal to output voltage VO UT at this moment.The adjustment voltage that the PWM controller is exported according to isolation feedback circuit, the ON time of gauge tap pipe Q2, thus control FLYBACK changer dutycycle realizes FLYBACK changer output voltage VO UT is adjusted on a large scale.
In order to improve the adjustment precision of output voltage, the present invention has adopted adjustable current source, is used for a control voltage V
CConvert proportional with it current controling signal to, and make current controling signal act on the input of isolation feedback circuit, realize control voltage V
CLinear scale control relation to output voltage VO UT.In order to realize that the FLYBACK changer works in the critical current mode of operation, the driving of FLYBACK changer is realized by the PWM controller U4 that works in the critical current pattern simultaneously.The PWM controller that is operated in the critical current pattern has zero current detection end (ZCD end-zero current detection), and need to increase a zero current detection circuit, this zero current detection circuit is used to detect the electric current of FLYBACK changer commutation diode D1 of flowing through, when transmitting fully, transformator T1 energy finishes, when the electric current of commutation diode D1 of flowing through is zero, the zero current detection circuit provides zero-signal and acts on the ZCD end, be used for the output that set again is operated in the PWM controller U4 of critical current pattern, make switching tube Q2 begin the conducting of new one-period, thereby realize the control of FLYBACK changer critical current pattern.
The zero current detection circuit can adopt multiple circuit to realize, preferred version of the present invention comprises an auxiliary winding N3 and detects resistance R 1, auxiliary winding N3 is as a winding on the former limit of FLYBACK changer, one end resistance R 1 after testing connects the ZCD end of the PWM controller U4 that is operated in the critical current pattern, other end ground connection, auxiliary winding N3 by with the coupling of secondary winding N2, make N3 end of the same name also produce proportional boost voltage with output voltage VO UT, when transformator T1 energy transmit fully finish after, N3 terminal voltage of the same name reduces to zero, be equivalent to hold a zero-signal to ZCD by resistance R 1, the ZCD end that is operated in the PWM controller U4 of critical current pattern detects this voltage reduce to zero after the then output of set U4 again, by its gate signal outfan (GATE end) driving switch pipe Q2, make Q2 begin the conducting of new one-period, thereby realize the control of FLYBACK changer critical current pattern.Under this mode of operation, flyback converter does not almost have Dead Time, so its peak point current is lower, and the power consumption of circuit is lower.
Isolation feedback circuit and adjustable constant-flow source can adopt multiple circuit-mode to realize, the preferred enforcement circuit that the present invention adopts is shown in Fig. 3,4.Isolation feedback circuit adopts the optocoupler feedback to realize, the optocoupler feedback is a kind of scheme of the common reliable and economic the most that adopts of Switching Power Supply, and has the isolated function of safety.U3 is a photo-coupler, and U2 is three-terminal voltage regulator ZR431, and the 4th resistance R 4 and the 3rd resistance R 3 are composed in series sample circuit, another termination FLYBACK changer output voltage VO UT end of R4, R3 other end ground connection.Three-terminal voltage regulator U2 is serially connected between the light-emitting diodes tube cathode and ground of photo-coupler U3, the adjustment terminating resistor R4 of U2 and the node of R3, because output voltage can reach 150V, therefore surpass three-terminal voltage regulator ZR431 and can accept voltage range, need independently+the 5V reference voltage provides bias current by resistance R 6 for U2.The photocell of photo-coupler U3 is as the outfan of isolation feedback circuit, and the FB end of voltage to critical current pattern PWM controller U4 adjusted in output.Constant-current source is by error amplifier U1, electric current adjustment pipe Q1, and second resistance R 2, the 5th resistance R 5 constitute.Control voltage VC acts on the positive input terminal of error amplifier U1, the negative input end of U1 links to each other with the emitter stage of electric current adjustment pipe Q1, and through resistance R 2 ground connection, the outfan of U1 is through the control end of resistance R 5 connection Q1, and the colelctor electrode of electric current adjustment pipe Q1 connects the node of isolation feedback circuit resistance R 4 and R3.The resistance R 4 of isolation feedback circuit, R3 and the adjustable current source that is made of U1, Q1, R2, R5 provide adjustable VD control, control voltage V
CVariation can cause the reference voltage V of three-terminal voltage regulator U2
431refMinor variations occurs, and cause that the FB terminal voltage changes, thereby change the dutycycle of FLYBACK changer, and then realize regulating output voltage V
OUT
Below be to do further quantitative analysis explanation at buck-boost converter circuit of the present invention shown in Figure 3:
1, FLYBACK changer is because the existence of isolating transformer can realize the isolation of input and output.The FLYBACK changer works in critical conduction mode, according to the weber equilibrium principle, can draw following equation:
V
IN×D×N＝N
OUT×(1-D)
Therefore,
Wherein: N is the turn ratio, and N=N2:N1, D are FLYBACK changer work dutycycle, V
INBe FLYBACK changer input voltage, V
OUTBe FLYBACK changer output voltage.
As can be seen from the above equation, under the condition of stationary transformer turn ratio N, adjust FLYBACK changer work dutycycle D, its output voltage V
OUTBoth can be greater than input voltage V
IN, also can be less than input voltage V
IN
2, adjustable constant-flow source circuit as shown in Figure 3, the major function of realization are that control voltage Vc is converted to constant current Ir, with the control output voltage.According to Fig. 3 circuit, can controlled voltage V
CWith output voltage V
OUTBetween relation:
Wherein: V
431refBe the reference voltage of three-terminal voltage regulator U2, V
CBe control voltage;
By formula 3 as can be seen, by selecting suitable resistance value and reference voltage V
431ref, just can realize controlling voltage V
CWith output voltage V
OUT(10V-150V output) is linear.
By above-mentioned quantitative analysis explanation, further prove buck-boost converter of the present invention by working in the FLYBACK circuit of critical current pattern, realized isolating the function of BUCK-BOOST circuit, realized control voltage V by the adjustable constant-flow source circuit
CTo output voltage V
OUTLinear scale control relation, be highly suitable for the applied environment of defibrillation pace-making power supply.
Be understandable that, for those of ordinary skills, can be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, and all these changes or replacement all should belong to the protection domain of the appended claim of the present invention.
Claims (6)
1, a kind of buck-boost converter that is used for defibrillation pace-making power supply is characterized in that: comprise an anti exciting converter, a PWM controller, and isolation feedback circuit;
In the described anti exciting converter behind the former limit winding of the transformator serial connection switching tube as the input of this anti exciting converter, behind its secondary winding serial connection commutation diode as the outfan of this anti exciting converter;
One input of described isolation feedback circuit connects described anti exciting converter outfan, its another input termination one control signal, described isolation feedback circuit is used for the sampled signal of anti exciting converter output voltage and described control signal are superposeed, and exports one and adjust the feedback voltage end that voltage acts on described PWM controller; Described PWM controller changes the anti exciting converter output voltage according to this ON time of adjusting the described switching tube of Control of Voltage.
2, buck-boost converter according to claim 1, it is characterized in that: described control signal is a current controling signal, and described buck-boost converter also comprises an adjustable constant-flow source, described adjustable constant-flow source is used for a control voltage transitions is become proportional with it described current controling signal, makes anti exciting converter output voltage and described control voltage linear.
3, buck-boost converter according to claim 1 and 2, it is characterized in that: described PWM controller is the PWM controller that is operated in the critical current pattern, include the zero current detection end, its gate signal outfan connects described control end of switching tube, and its feedback voltage end connects described isolation feedback circuit outfan; Described buck-boost converter also comprises a zero current detection circuit, be used to detect the electric current of described commutation diode of flowing through, and when the electric current of the described commutation diode of flowing through is zero, provide zero-signal and act on described zero current detection end, be used for the described output that is operated in the PWM controller of critical current pattern of set again, make described switching tube begin the conducting of new one-period.
4, buck-boost converter according to claim 3, it is characterized in that: described zero current detection circuit comprises an auxiliary winding and detects resistance, one end of described auxiliary winding connects described zero current detection end through described detection resistance, its other end ground connection, described auxiliary winding by with the coupling of described secondary winding, obtain and the proportional boost voltage of described output voltage, when the electric current of the described commutation diode of flowing through is zero, described boost voltage drops to zero, and acting on the zero current detection end by described detection resistance is zero-signal.
5, buck-boost converter according to claim 2 is characterized in that: described isolation feedback circuit comprises a photo-coupler, three-terminal voltage regulator, and sample circuit; Described sample circuit comprises the 4th and the 3rd resistance, and the two is serially connected between anti exciting converter output voltage terminal and the ground, and the 3rd resistance is sample resistance; Described three-terminal voltage regulator is serially connected between the light-emitting diodes tube cathode and ground of photo-coupler, and it adjusts the node of end connection the described the 4th and the 3rd resistance, and the photocell of described photo-coupler is exported described adjustment voltage.
6, buck-boost converter according to claim 5, it is characterized in that: described adjustable constant-flow source comprises an error amplifier, and electric current adjustment pipe, the positive input terminal of described error amplifier applies described control voltage, its negative input end links to each other after second resistance eutral grounding with the emitter-base bandgap grading that described electric current is adjusted pipe, its outfan connects the control end that described electric current is adjusted pipe through the 5th resistance, and the colelctor electrode of described electric current adjustment pipe connects the node of the 4th and the 3rd resistance of described isolation feedback circuit.
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| CN 200710077353 CN101461983B (en) | 2007-12-18 | 2007-12-18 | Voltage-regulating converter for power of defibrillation and pacing apparatus |
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| US11607555B2 (en) | 2016-12-12 | 2023-03-21 | Avive Solutions, Inc. | Defibrillator discharge control |
| CN109256976A (en) * | 2018-09-28 | 2019-01-22 | 南京智能高端装备产业研究院有限公司 | A kind of adjustable high-voltage pulse driving circuit of output waveform |
| CN110957924A (en) * | 2019-12-12 | 2020-04-03 | 苏州力生美半导体有限公司 | Flyback switching power supply supporting wide output voltage range and charging method |
| CN112203381A (en) * | 2020-09-03 | 2021-01-08 | 杭州士兰微电子股份有限公司 | Dimming control circuit and control method thereof |
| CN113713260A (en) * | 2021-07-26 | 2021-11-30 | 上海健康医学院 | Ultrashort pulse defibrillator |
| CN117559611A (en) * | 2024-01-10 | 2024-02-13 | 江西朴拙医疗设备有限公司 | Eye electro-stimulation treatment device |
| CN117559611B (en) * | 2024-01-10 | 2024-03-22 | 江西朴拙医疗设备有限公司 | Eye electro-stimulation treatment device |
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