CN106597357A - Calibrating device of defibrillation energy analyzer - Google Patents
Calibrating device of defibrillation energy analyzer Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N1/00—Electrotherapy; Circuits therefor
- A61N1/18—Applying electric currents by contact electrodes
- A61N1/32—Applying electric currents by contact electrodes alternating or intermittent currents
- A61N1/38—Applying electric currents by contact electrodes alternating or intermittent currents for producing shock effects
- A61N1/39—Heart defibrillators
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R22/00—Arrangements for measuring time integral of electric power or current, e.g. electricity meters
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Abstract
Disclosed is a calibrating device of a defibrillation energy analyzer. The calibrating comprises a control module, a charging module, a power supply module, a capacitive module, a discharging module, an energy test module, a self-detection and self-calibration module, a protection module and a display module; the charging module, the discharging module, the energy test module, the self-detection and self-calibration module and the display module are connected with the control module; the power supply module and the capacitive module are connected with the charging module; and the protection module is connected with the capacitive module. The calibrating device of the defibrillation energy analyzer has the advantages of higher accuracy and reliability of metering calibration.
Description
Technical Field
The invention relates to the technical field of medical equipment metering, in particular to a calibration device for a defibrillation energy analyzer.
Background of the invention
The cardiac defibrillator is also called as cardioverter, and is one of the rescue devices widely used clinically at present. Defibrillation energy generators are used to generate monophasic waveforms, and most of the defibrillator energy is adjustable, typically from 2J to 360J (joules). The energy delivered by the defibrillator should be the lowest energy that can stop ventricular fibrillation, and if too low energy is delivered it will not stop arrhythmia, and too high energy will cause burning and edema of the skin against the electrodes and even damage to the heart muscle cells. The accuracy of the defibrillator's delivered energy is therefore one of the important indicators in determining whether a defibrillator is acceptable.
Most of the standard instruments for controlling the quality of the defibrillator at present, namely defibrillator analyzers, depend on the import of the United states and Europe, and due to the particularity of pulse energy testing, metering mechanisms at all levels do not have corresponding tracing methods. In China, only a global military medical metering calibration laboratory can carry out calibration of parts according to a factory calibration method provided by a manufacturer, namely, a shell is opened to carry out calibration of parts according to an instrument circuit schematic diagram. On one hand, the method needs to open the casing, and has a difference with the conventional metering calibration requirement, and on the other hand, due to the difference of circuit schematic diagrams of different models of different manufacturers, the calibration of the equipment is difficult to form a uniform standard. Therefore, when the medical equipment is registered, checked and metered, the defibrillator analyzers of different manufacturers have inconsistent measurement results of the same defibrillator, so that the accuracy and reliability of the registration, check and metering and calibration of the medical equipment are limited.
According to the principle of stored energy of a defibrillation energy analyzer and simulated impedance discharge of a human body, two methods are mainly used for measuring the energy of the existing defibrillation pulse: (1) the capacitance voltage method generally needs to assume that the performance of an energy storage capacitor is relatively stable, and the voltage coefficient of a capacitance value is zero, that is, the capacitance value remains unchanged when the voltages at two ends of the energy storage capacitor change along with charging and discharging, but in practical application, the capacitance value changes to a certain extent along with the changes of temperature and the voltages at the two ends, the requirement on the accuracy of the instantaneous voltage measurement at the two ends before and after the capacitor discharges is very high, and the measurement error is large, so the method is generally only used for controlling the cut-off voltage of the energy released by a defibrillation energy source; (2) the voltage resistance integration method is widely applied, is an energy calculation method adopted by various mainstream defibrillator analyzers at present, and has the premise that human body analog impedance is assumed to be an noninductive pure resistor, but the human body analog resistor needs to bear higher energy and needs higher power, and a certain amount of distributed inductance and capacitance is inevitably present, so that the method is not suitable for accurately measuring the energy of defibrillation pulses.
Therefore, there is a need to develop a calibration apparatus for a defibrillation energy analyzer with high accuracy and reliability of measurement calibration.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention provides a calibration device for a defibrillation energy analyzer, which can accurately measure defibrillation pulse energy and is used for calculation with high energy calculation precision requirement.
According to the present invention, there is provided a calibration apparatus for a defibrillation energy analyzer comprising:
a control module;
the charging module is connected to the control module;
the power supply module is connected with the charging module and used for providing power supply energy for the charging module;
the capacitor module is connected with the charging module;
the charging module is used for storing the power supply energy of the power supply module to the capacitor module;
the discharging module is connected to the control module and used for discharging the power supply energy stored by the capacitor module according to a waveform;
the energy testing module is connected with the control module and used for acquiring the voltage signal and the current signal released by the discharging module and calculating a standard value of actually released energy;
the self-checking self-calibration module is connected with the control module and is used for checking whether the power supply module is normal or not and periodically measuring and compensating charging energy deviation caused by capacitance value change in the charging module;
the protection module is connected with the capacitor module and used for protecting the power supply module to work in a normal range and automatically releasing capacitor energy through an internal circuit after the capacitor module is charged to a preset time;
the display module is connected with the control module and used for displaying the current discharge waveform, the charging state, the standard value of the actual release energy and the pulse voltage current value;
the control module is used for realizing the startup of the device and controlling the functions of the charging module, the discharging module, the self-checking self-calibration module, the energy testing module and the display module.
Preferably, the capacitance module includes:
a diode having an anode connected to the charging module;
one end of the capacitor is connected with the cathode of the diode, and the other end of the capacitor is connected to the charging module;
one end of the first relay is connected to the control module and the cathode of the diode;
and the second relay is respectively connected with the control module and the other end of the capacitor.
Preferably, the energy testing module comprises:
one end of the voltage divider is connected to the first relay, and the other end of the voltage divider is connected to the control module through a voltage acquisition signal collection unit;
one end of the current detection resistor is connected to the second relay, and the other end of the current detection resistor is connected to the control module through a current signal acquisition unit;
and one end of the external resistor is connected to the first relay, and the other end of the external resistor is connected with the current detection resistor.
Preferably, the discharge module includes: a unidirectional discharge module and a bidirectional discharge module.
Preferably, the unidirectional discharge module includes:
the current sensor is connected with the current signal acquisition unit;
and one end of the first load is connected with the first relay, and the other end of the first load is connected to the second relay through the current sensor.
Preferably, the bidirectional discharging module includes:
the H-bridge driving circuit is respectively connected with the first relay and the second relay;
and one end of the switch driving unit is connected to the control module, and the other end of the switch driving unit is connected with the H-bridge driving circuit.
Preferably, the H-bridge driving circuit includes:
a second load;
the switch assembly comprises a first switch assembly, a second switch assembly, a third switch assembly and a fourth switch assembly, wherein the first switch assembly is connected with the third switch assembly in parallel, the second switch assembly is connected with the fourth switch assembly in parallel, and after the first switch assembly and the third switch assembly are connected in parallel, the second switch assembly and the fourth switch assembly are connected in parallel, and the second switch assembly and the fourth switch assembly are connected in series through the second load.
Preferably, the first switch component is formed by connecting a first switch and a second switch in series, the second switch component is formed by connecting a third switch and a fourth switch in series, the third switch component is formed by connecting a fifth switch and a sixth switch in series, the fourth switch component is formed by connecting a seventh switch and an eighth switch in series, and the first switch to the eighth switch are high-voltage insulated gate bipolar transistors.
Preferably, the energy testing module calculates a standard value of the energy by a voltage-current integration method, collects the voltage signal and the current signal while releasing the energy, calculates power within an instantaneous time t according to the voltage and the current, and integrates the power with the time t, which is represented by the following formula:
E＝∫UIdt
wherein,
e, instantaneous power; u, voltage; i, current.
Preferably, the self-checking and self-calibrating mode of the self-checking and self-calibrating module is as follows:
τ＝R*C
wherein, tau is a charging time constant calculated by the control module;
r, external resistance;
and C, obtaining the capacitance value of the energy storage capacitor.
The calibration device for the defibrillation energy analyzer has the advantages that: the energy testing module adopts a voltage-current integration method, the energy is calculated by acquiring voltage and current signals while releasing energy, calculating instantaneous power according to voltage and current and calculating the integral of power by time to obtain an energy value;
the voltage and current integration method is not influenced by the size of a human body simulation load resistor and the distributed inductance and capacitance, can accurately measure the defibrillation pulse energy, and is suitable for calculation with high energy calculation precision requirement;
the calibration device of the defibrillation energy analyzer can ensure the accuracy, traceability and comparability of the energy released by the defibrillator.
The apparatus of the present invention has other features and advantages which will be apparent from or are set forth in detail in the accompanying drawings and the following detailed description, which are incorporated herein, and which together serve to explain certain principles of the invention.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts.
Fig. 1 shows a schematic structural diagram according to an exemplary embodiment of the present invention.
Fig. 2 shows a schematic structural diagram of a capacitance module and an energy testing module according to an exemplary embodiment of the present invention.
Fig. 3 shows a schematic structural diagram of a unidirectional discharge module according to an exemplary embodiment of the present invention.
Fig. 4 shows a schematic structural diagram of a bidirectional discharge module according to an exemplary embodiment of the present invention.
Description of reference numerals:
1. a control module; 2. a charging module; 3. a capacitive module; 4. a discharge module; 5. an energy testing module; 6. a self-checking self-calibration module; 7. a protection module; 8. a display module; 9. a power supply module; 31. a diode; 32. a capacitor; 33. a first relay; 34. a second relay; 41. a current sensor; 42. a first load; 43. a switch driving unit; 44. a second load; 46. an H-bridge drive circuit; 51. a voltage divider; 52. current detecting resistance; 53. connecting a resistor externally; 54. a voltage signal acquisition unit; 55. and a current signal acquisition unit.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
According to the present invention there is provided a valuable defibrillation energy analyzer calibration apparatus comprising: a control module; the charging module is connected to the control module; the power supply module is connected with the charging module and used for providing power supply energy for the charging module; the capacitor module is connected with the charging module; the charging module is used for storing power supply energy of the power supply module to the capacitor module; the discharging module is connected to the control module and used for discharging the power supply energy stored by the capacitor module according to the waveform; the energy testing module is connected with the control module and used for acquiring voltage signals and current signals released by the discharging module and calculating a standard value of actually released energy; the self-checking self-calibration module is connected with the control module and is used for checking whether the power supply module is normal or not and periodically measuring and compensating charging energy deviation caused by capacitance value change in the charging module; the protection module is connected with the capacitor module and used for protecting the power supply module to work in a normal range and automatically releasing capacitor energy through an internal circuit after the capacitor module is charged to a preset time; the display module is connected with the control module and used for displaying the current discharge waveform, the charging state, the standard value of the actual release energy and the pulse voltage current value; the control module is used for starting the device and controlling the functions of the charging module, the discharging module, the self-checking self-calibration module, the energy testing module and the display module.
After the device is started, the charging module stores power energy to the capacitor module, and after charging, the discharging module discharges the energy stored by the capacitor module according to the control requirement in a unidirectional wave or bidirectional wave mode.
After a user selects charging energy and triggers a power switch, a charging plate of the charging module is controlled to charge the energy storage capacitor module through a main control panel of the control module; if a discharging module is triggered within a preset time (such as 1 minute) after the charging is finished, the main control board firstly sends an acquisition signal to an energy acquisition board of the energy testing module, and then controls the discharging board of the discharging module to release defibrillation pulses according to the selected waveform (unidirectional wave and bidirectional wave); after the discharging is finished, the main control board collects the pulse energy, and the transmitted energy standard value, the voltage current peak value and the defibrillation pulse waveform are displayed through the display module.
As a preferred scheme, the energy testing module adopts a voltage-current integration method to calculate a standard value of energy, collects a voltage signal and a current signal while releasing the energy, calculates power within an instantaneous time t according to the voltage and the current, and integrates the power at the time t, wherein the formula is as follows:
E＝∫UIdt
wherein, E, instantaneous power; u, voltage; i, current.
The energy testing module adopts a voltage-current integration method, the energy is calculated by acquiring voltage and current signals while releasing energy, calculating instantaneous power according to voltage and current and calculating the integral of power over time to obtain an energy value.
The voltage and current integration method is not affected by the size of a human body simulation load resistor and the distributed inductance and capacitance, can accurately measure the defibrillation pulse energy, and is suitable for calculation with high energy calculation precision requirements.
Preferably, the capacitor module includes:
the anode of the diode is connected to the charging module;
one end of the capacitor is connected with the cathode of the diode, and the other end of the capacitor is connected to the charging module;
one end of the first relay is connected to the control module and the cathode of the diode;
and the second relay is respectively connected with the control module and the other end of the capacitor.
Preferably, the energy testing module comprises:
one end of the voltage divider is connected to the first relay, and the other end of the voltage divider is connected to the control module through the voltage acquisition signal collection unit;
one end of the current detection resistor is connected to the second relay, and the other end of the current detection resistor is connected to the control module through the current signal acquisition unit;
and one end of the external resistor is connected to the first relay, and the other end of the external resistor is connected with the current detection resistor.
The energy testing module is externally connected with the defibrillation simulator to discharge, and the self-checking self-calibration module discharges by adopting an external resistor. The purpose of the self-test self-calibration module is to detect whether the energy standard source can work normally. Including charge normal, discharge normal and energy test normal. During the use of the energy standard source, the capacitance value of the energy storage capacitor changes. In order to ensure that the discharge energy is still accurate, the charging energy should first be ensured to be accurate. The self-checking self-calibration mode is as follows: the external resistor is a resistor with high precision and high stability, so that the influence of a discharge resistor can be eliminated, the charging time constant tau is calculated through the control module, the external resistor R is known due to the fact that tau is R C, the capacitance value C of the energy storage capacitor can be obtained, if the capacitance value C of the energy storage capacitor is reduced, the control module needs to control to charge higher voltage under the same charging energy, and self-detection and self-calibration are completed.
The energy testing module receives an energy detection signal of a main control board of the control module, then detects the voltage and current values of the released defibrillation pulse in real time, and acquires, processes and transmits the released voltage and current values to the main control board of the control module through the A/D conversion circuit and the microcontroller processing circuit (STM32 processing circuit); a voltage signal acquisition unit and a current signal acquisition unit in the energy testing module convert voltages up to thousands of volts and currents of tens of amperes into voltage signals in the normal working range of the A/D chip by utilizing a voltage divider and a current detection resistor, the detection circuits are all resistors with 1% precision non-inductive design, and the resistors of the detection circuits are non-inductive high-power resistors of 8-12 m omega. In order to reduce the influence of the current detection resistor on the defibrillation pulse as much as possible, the detection resistor is a non-inductive high-power resistor of 10m omega.
Wherein, the microcontroller adopts STM32 series.
Furthermore, the energy testing module can introduce various high-frequency noises when high-voltage high-speed sampling is carried out, and the high-frequency noises are processed in the following modes: firstly, the acquired signal enters the input end of an A/D sampling chip and is added with a filter circuit to filter high-frequency interference in the signal, and then a high-voltage acquisition part is added with a magnetic ring by a lead connected with the A/D sampling chip; in addition, a shielding cover is added on the A/D sampling chip and the peripheral circuit thereof, and the A/D sampling chip and the control module are isolated by optical coupling. Wherein the filter circuit is an LC filter circuit. The inductance of the LC filter circuit has small resistance, low direct current loss, large inductance to alternating current and good filtering effect.
The measures adopt electromagnetic compatibility (EMC) magnetic elements with higher anti-interference capability, and the EMC magnetic elements can ensure that the electromagnetic interference generated to the environment in the normal operation process of the equipment does not exceed a certain limit value; on the other hand, the device has certain degree of immunity to electromagnetic interference existing in the environment, namely electromagnetic sensitivity, thereby effectively reducing the interference on the sampling signal.
Preferably, the discharge module includes: a unidirectional discharge module and a bidirectional discharge module.
Preferably, the unidirectional discharging module includes:
the current sensor is connected with the current signal acquisition unit;
and one end of the first load is connected with the first relay, and the other end of the first load is connected to the second relay through the current sensor.
Preferably, the bidirectional discharging module includes:
the H-bridge driving circuit is respectively connected with the first relay and the second relay;
and one end of the switch driving unit is connected to the control module, and the other end of the switch driving unit is connected with the H-bridge driving circuit.
Preferably, the H-bridge driving circuit includes:
a second load;
the switch assembly comprises a first switch assembly, a second switch assembly, a third switch assembly and a fourth switch assembly, wherein the first switch assembly is connected with the third switch assembly in parallel, the second switch assembly is connected with the fourth switch assembly in parallel, and the first switch assembly and the third switch assembly which are connected in parallel and the second switch assembly and the fourth switch assembly which are connected in parallel are connected in series through a second load.
Preferably, the first switch component is formed by connecting a first switch and a second switch in series, the second switch component is formed by connecting a third switch and a fourth switch in series, the third switch component is formed by connecting a fifth switch and a sixth switch in series, the fourth switch component is formed by connecting a seventh switch and an eighth switch in series, and the first switch to the eighth switch are high-voltage insulated gate bipolar transistors.
The single-phase wave discharging is that the direction of current is not changed in the discharging process, after charging is completed, a main control board of a control module drives a high-voltage Insulated Gate Bipolar Transistor (IGBT) of an H bridge driving circuit to be conducted by controlling a first relay or a second relay, and meanwhile, a switch I, a switch II, a switch seventh and a switch eighth are closed, so that stored energy is released to a human body simulation resistor of the defibrillation energy analyzer.
The direction of a pulse circuit released in the working process of the double-phase wave discharge is reversed to the negative direction from the initial positive direction after discharging for a set time; after charging is finished, the first relay and the second relay are controlled to be closed, and a high-voltage Insulated Gate Bipolar Transistor (IGBT) of the H-bridge driving circuit is driven to be switched on and switched off; the first switch, the second switch, the seventh switch and the eighth switch are divided into one group, the third switch, the fourth switch, the fifth switch and the sixth switch are divided into another group, and four switch tubes in the two groups are simultaneously opened or closed; the two groups of switches are alternately conducted, the direction of current flowing through a human body simulation resistor of the defibrillation energy analyzer is controlled to change, so that a two-phase cutoff exponential defibrillation discharge waveform is formed, and the pulse discharge waveform still follows exponential decay in the two discharge directions.
The discharge board of the discharge module is partially used for driving and controlling a high-voltage Insulated Gate Bipolar Transistor (IGBT), namely controlling a grid driving waveform of the high-voltage Insulated Gate Bipolar Transistor (IGBT), and the transformer is used for isolation driving, so that the interference on a driving signal is reduced; after the interference of the driving signal is removed, the phenomenon that the high-voltage Insulated Gate Bipolar Transistor (IGBT) is conducted secondarily due to the peak interference on the driving signal, and the H-bridge driving circuit is directly connected can be prevented, so that the high-voltage Insulated Gate Bipolar Transistor (IGBT) is damaged; in addition, a capacitor used in an RC snubber circuit between a C electrode and an E electrode of a high-voltage Insulated Gate Bipolar Transistor (IGBT) is required to be resistant to voltage.
In conclusion, the calibration device of the defibrillation energy analyzer provides reliable standard instruments for medical equipment manufacturing enterprises and medical equipment detection mechanisms at all levels to carry out registration inspection, metering traceability and the like, so that the accuracy, traceability and comparability of the energy released by the defibrillator are guaranteed.
Examples
Fig. 1 shows a schematic structural diagram according to an exemplary embodiment of the present invention.
A defibrillation energy analyzer calibration apparatus according to an exemplary embodiment of the present invention includes:
a control module 1;
the charging module 2 is connected to the control module 1;
the power module 9, the power module 9 is connected with the charging module 2, and is used for providing power energy for the charging module 2;
the capacitor module 3 is connected with the charging module 2;
after the device is started, the charging module 2 is used for storing the power energy of the power module 9 into the capacitor module 3;
the discharging module 4 is connected to the control module 1, and is used for discharging the power supply energy stored in the capacitor module 3 according to the waveform after charging;
the energy testing module 5 is connected with the control module 1 and used for acquiring voltage signals and current signals released by the discharging module 4 and calculating a standard value of actually released energy;
the self-checking self-calibration module 6 is connected with the control module 1 and is used for checking whether the power module 9 is normal or not and periodically measuring and compensating charging energy deviation caused by capacitance value change in the charging module 2;
the protection module 7 is connected with the capacitor module 3, and is used for protecting the power supply module 9 from working in a normal range and automatically releasing capacitor energy through an internal circuit after the capacitor module 3 is charged to a preset time;
the display module 8 is connected with the control module 1 and used for displaying the current discharge waveform, the charging state, the standard value of the actual release energy and the pulse voltage current value;
the control module 1 is used for realizing the startup of the device, and controlling the functions of the charging module 2, the discharging module 4, the self-checking self-calibration module 6, the energy testing module 5 and the display module 8.
Fig. 2 shows a schematic structural diagram of a capacitance module and an energy testing module according to an exemplary embodiment of the present invention.
As shown in fig. 2, the capacitance module 3 includes:
a diode 31, the anode of the diode 31 being connected to the charging module 2;
one end of the capacitor 32 is connected with the cathode of the diode 31, and the other end of the capacitor 32 is connected to the charging module 2;
a first relay 33, one end of the first relay 33 is connected to the control module 1 and the cathode of the diode 31;
the second relay 34 and the second relay 34 are respectively connected with the control module 1 and the other end of the capacitor 32.
The energy test module 5 includes:
a voltage divider 51, one end of the voltage divider 51 is connected to the first relay 33, and the other end is connected to the control module 1 through a voltage acquisition signal collection unit 54;
a current detecting resistor 52, wherein one end of the current detecting resistor 52 is connected to the second relay 34, and the other end is connected to the control module 1 through a current signal acquisition unit 55;
and an external resistor 53, wherein one end of the external resistor 53 is connected to the first relay 33, and the other end of the external resistor 53 is connected to the current detection resistor 52.
Fig. 3 shows a schematic structural diagram of a unidirectional discharge module according to an exemplary embodiment of the present invention. Fig. 4 shows a schematic structural diagram of a bidirectional discharge module according to an exemplary embodiment of the present invention.
As shown in fig. 3 and 4, the discharge module 4 includes: a unidirectional discharge module and a bidirectional discharge module.
Wherein, the one-way discharge module includes:
the current sensor 41, the current sensor 41 is connected with the current signal acquisition unit 55;
and a first load 42, one end of the first load 42 being connected to the first relay 33, and the other end being connected to the second relay 34 through the current sensor 41.
The bidirectional discharge module includes:
an H-bridge drive circuit 46, the H-bridge drive circuit 46 being connected to the first relay 33 and the second relay 34, respectively;
and a switch driving unit 43, wherein one end of the switch driving unit 43 is connected to the control module 1, and the other end of the switch driving unit 43 is connected with an H-bridge driving circuit 46.
The H-bridge drive circuit 46 includes:
a second load 44;
the switch assembly comprises a first switch assembly, a second switch assembly, a third switch assembly and a fourth switch assembly, wherein the first switch assembly is connected with the third switch assembly in parallel, the second switch assembly is connected with the fourth switch assembly in parallel, and the first switch assembly and the third switch assembly which are connected in parallel and the second switch assembly and the fourth switch assembly which are connected in parallel are connected in series through a second load 44.
The first switch component is formed by connecting a first switch and a second switch in series, the second switch component is formed by connecting a third switch and a fourth switch in series, the third switch component is formed by connecting a fifth switch and a sixth switch in series, the fourth switch component is formed by connecting a seventh switch and an eighth switch in series, and the first switch to the eighth switch are high-voltage insulated gate bipolar transistors.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the illustrated embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (10)
1. A defibrillation energy analyzer calibration apparatus comprising:
a control module;
the charging module is connected to the control module;
the power supply module is connected with the charging module and used for providing power supply energy for the charging module;
the capacitor module is connected with the charging module;
the charging module is used for storing the power supply energy of the power supply module to the capacitor module;
the discharging module is connected to the control module and used for discharging the power supply energy stored by the capacitor module according to a waveform;
the energy testing module is connected with the control module and used for acquiring the voltage signal and the current signal released by the discharging module and calculating a standard value of actually released energy;
the self-checking self-calibration module is connected with the control module and is used for checking whether the power supply module is normal or not and periodically measuring and compensating charging energy deviation caused by capacitance value change in the charging module;
the protection module is connected with the capacitor module and used for protecting the power supply module to work in a normal range and automatically releasing capacitor energy through an internal circuit after the capacitor module is charged to a preset time;
the display module is connected with the control module and used for displaying the current discharge waveform, the charging state, the standard value of the actual release energy and the pulse voltage current value;
the control module is used for realizing the startup of the device and controlling the functions of the charging module, the discharging module, the self-checking self-calibration module, the energy testing module and the display module.
2. The defibrillation energy analyzer calibration device of claim 1, wherein the capacitance module comprises:
a diode having an anode connected to the charging module;
one end of the capacitor is connected with the cathode of the diode, and the other end of the capacitor is connected to the charging module;
one end of the first relay is connected to the control module and the cathode of the diode;
and the second relay is respectively connected with the control module and the other end of the capacitor.
3. The defibrillation energy analyzer calibration device of claim 2, wherein the energy testing module comprises:
one end of the voltage divider is connected to the first relay, and the other end of the voltage divider is connected to the control module through a voltage acquisition signal collection unit;
one end of the current detection resistor is connected to the second relay, and the other end of the current detection resistor is connected to the control module through a current signal acquisition unit;
and one end of the external resistor is connected to the first relay, and the other end of the external resistor is connected with the current detection resistor.
4. The defibrillation energy analyzer calibration device of claim 1, wherein the discharge module comprises: a unidirectional discharge module and a bidirectional discharge module.
5. The defibrillation energy analyzer calibration device of claim 4, wherein the unidirectional discharge module comprises:
the current sensor is connected with the current signal acquisition unit;
and one end of the first load is connected with the first relay, and the other end of the first load is connected to the second relay through the current sensor.
6. The defibrillation energy analyzer calibration device of claim 4, wherein the bi-directional discharge module comprises:
the H-bridge driving circuit is respectively connected with the first relay and the second relay;
and one end of the switch driving unit is connected to the control module, and the other end of the switch driving unit is connected with the H-bridge driving circuit.
7. The defibrillation energy analyzer calibration device of claim 6, wherein the H-bridge drive circuit comprises:
a second load;
the switch assembly comprises a first switch assembly, a second switch assembly, a third switch assembly and a fourth switch assembly, wherein the first switch assembly is connected with the third switch assembly in parallel, the second switch assembly is connected with the fourth switch assembly in parallel, and after the first switch assembly and the third switch assembly are connected in parallel, the second switch assembly and the fourth switch assembly are connected in parallel, and the second switch assembly and the fourth switch assembly are connected in series through the second load.
8. The defibrillation energy analyzer calibration device of claim 7, wherein the first switch assembly is a first switch and a second switch in series, the second switch assembly is a third switch and a fourth switch in series, the third switch assembly is a fifth switch and a sixth switch in series, the fourth switch assembly is a seventh switch and an eighth switch in series, and the first to eighth switches are high voltage insulated gate bipolar transistors.
9. The defibrillation energy analyzer calibration apparatus according to claim 1, wherein the energy test module calculates the standard value of the energy by a voltage-current integration method, collects the voltage signal and the current signal while the energy is released, calculates the power within the instantaneous time t according to the voltage and the current, and integrates the power over the time t by the formula:
E＝∫UIdt
wherein,
e, instantaneous power; u, voltage; i, current.
10. The defibrillation energy analyzer calibration device of claim 1, wherein the self-test self-calibration module self-tests self-calibrates in a manner of:
τ＝R*C
wherein, tau is a charging time constant calculated by the control module;
r, external resistance;
and C, obtaining the capacitance value of the energy storage capacitor.
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