Method of generating bipolar and multiphase pulses

FIELD: physics.

SUBSTANCE: invention can be used for generating powerful bipolar and multiphase electric pulses. The method involves controlling series-connected single-type power cells containing electrical energy accumulators, and providing switching of positive and negative polarity of the connection of the energy accumulator to leads of the cell, and switching the electrical energy accumulator to leads of the cell, and having bypass diodes which provide flow of current through leads of the cell when electrical energy accumulators are disconnected from the leads of the cell. A signal from a current sensor is transmitted to the analogue input of a digital signal processor (DSP), from the digital outputs of which the power cells are controlled. Before completion of generation of a pulse, the digital signal processor periodically converts the signal from the current sensor, standardises it, calculates deviation from the current value stores in the digital signal processor of the pulse form and compares the deviation with four limiting values. Signals for controlling power cells are output from the outputs of the digital signal processor depending on the comparison results.

EFFECT: simplification of the method of generating pulses and reducing the number of circuit components.

7 dwg, 1 tbl

 

The invention can be used in defibrillators with bipolar and multiphase pulse shape, forming a powerful bipolar and multi-phase electrical impulses, power inverters, AC, powerful amps DC.

The known method of forming a powerful signal AC high power series-connected power cells for the formation of the signals of both positive and negative polarity. This method appears in the U.S. patent 7,170,767. In this method, each cell has its own local controller modulation providing the required average value of the output voltage of the cell in the range from zero to the voltage on the energy storage unit. However, if the required output voltage exceeds the total voltage of a certain number of series-connected power cells, it is always in the high number of power cells drives the electrical energy may be connected permanently to the findings of the power cells, and modulation should be implemented at the moment only one power cell. In this way, the formation of a strong signal there is no need for the controller modulation for each of the power cells, and control of power cells should be a single device on the Ohm, which will determine the number of power cells, which drives the electric energy will be constantly connected to the leads of the cell, and to perform the modulation of only one of the power cells. This approach allows to reduce the total number of switches in the power cell, which facilitates their thermal regime. Additionally, the modulation can be performed alternately on each cell, the average number of operations required for the formation of a strong signal, uniformly distributed between all of the power cells.

For the prototype accepted method presented in U.S. patent 6,546,287. In this method, the output voltage of each cell is formed by using a pulse-width modulation with a constant frequency and to set the pulse-width modulation in the cell is the value of the current voltage at the storage capacitor of the cell and passed through the analog optocoupler exemplary voltage value.

The disadvantages of this method are the need to transfer exemplary voltage values for each of the cells through the analog optocoupler, the need to measure the voltages on the storage capacitor, constant frequency pulse-width modulation simultaneous modulation all cells, the control circuit switching the polarity. It is Timoti transfer exemplary voltage values for each of the cells through the analog optocoupler and the need to measure the voltages on the storage capacitor to increase the value and size of the product. Constant frequency pulse-width modulation simultaneous modulation all cells increases loss on conversion due to excessive switching of power switches in the cells, resulting in deteriorating the heat mode of operation. Control circuit switching the polarity of the leads to the necessity of introducing a pause between the different phases of the pulse.

The challenge which seeks the invention is to simplify the control method, ensuring a minimum number of switching of power switches in the cells during the formation of the pulse, providing a uniform discharge of the storages of electric energy in cells in the process of formation of the impulse, ensuring the formation of an impulse without a pause between the different phases, reducing the number of analog circuits and reducing the number of circuit elements.

The essence of the invention lies in the fact that formation of impulse control connected in the same type of power cells that contain storages of electric energy and providing switching of positive and negative polarity connection of the drive energy to the conclusions of the cell and the switching of the drive electric power to the conclusions of the cell. These cells also contain the inverse diodes of specialsee the current flowing through the terminals of the cells, when the drive electric power is disconnected from the conclusions of the cell. The feedback signal is removed from the current sensor, connected in series to the power cells, and is applied to the analog input digital signal processors (DSPS). DSP converts the analog signal of the current detector into a digital value, performs an operation of normalization values, and calculates the deviation from the current digital value of the reference pulse waveform stored in the DSP, and a specific sequence of control actions sets the values of the digital control signals of the power cells.

If the drive electric power of the power cells are not constantly recharged, the voltage on them decreases as they are discharged by the current flowing in the load. The control objective is to ensure that the number of power cells needed to maintain the specified current value of the current in the load, and to ensure as uniform as possible, the discharge drive of electric energy in power cells if these drives are not constantly recharged, and to ensure uniform distribution of the number of switches between power cells.

Are used to control the four boundary values that are in the following ratio: the second positive edge C is Uchenie greater than the first positive boundary values, which is greater than zero, the second negative edge value is less than the first negative boundary values, which is less than zero.

The management is carried out by cyclic sequence of control actions in DSPS to complete the forming of the pulse.

To ensure uniform discharge of storages of electric energy in the power cell device and uniform distribution of the number of switches in them provided by the cyclic assignment of functions of each cell. When the total number N of cells, each of them can be the following function: modulating cell, constantly enabled cell 1, ... constantly enabled cell N. To complete the change of functions of the cell, respectively, must repeatedly switches between the N-state control cell functions.

The original number is constantly enabled and the power cell is set equal to zero, modulating cell is turned off, the positive and negative polarity of the power cell is disabled.

The inclusion of positive polarity of the power cell is performed when the current value of the exemplary envelope power exceeds the first positive edge value. When the current value of the exemplary envelope voltage becomes lower than the first positive boundary values, positive field is the capacity of the power cell is turned off. When positive polarity:

- border reduce the number of always-on cells is the second positive limit value,

the threshold modulation is the first positive edge value

- border enable modulation is the first negative edge value

- border of increasing the number of always-on cells is the second negative limit value.

When controlling the formation of a pulse of positive polarity is performed the following sequence of actions:

- Converts the current value of the voltage at the current sensor into a digital value.

- Is the normalization of the converted value of the voltage at the current sensor.

- Calculates the deviation of the normalized values of the voltage at the sensor current from the current value of the exemplary form of a current pulse.

The deviation is compared with four fixed values: border reduce the number of always-on cells, a threshold modulation, the boundary of the inclusion of the modulation boundary increasing the number of always-on cells.

- If the deviation is between the boundaries disable and enable modulation, the number of always-on cells remains unchanged, and the state moduliruya the cell is not changed.

- If the deviation is below the lower limit enable modulation, modulating cell is activated, and the number of always-on cells remains unchanged.

- If the deviation is below the lower limit of increasing the number of always-on power cells, the number of always-on cells is increased by 1, or is equal to the total number of power cells minus 1, and the condition of modulating cell is not changed.

- If the deviation is higher than the boundary off modulation, as in the previous cycle DSPS it was below the boundary off modulation, modulating cell is turned off, the number of always-on cells remains unchanged, and change the function performed by the cell.

- If the deviation is above the boundaries of reducing the number of always-on power cells, the number of always-on cells is reduced to 1 or is equal to 0, and the condition of modulating cell is not changed.

The inclusion of negative polarity in the power cell is performed when the current value of the exemplary envelope of the current pulse is lower than the first negative boundary values. When the current value of a model of the envelope of the current pulse exceeds the first negative edge value, the negative polarity of the power cell is turned off. The negative polarity:

the border took the ing the number of always-on cells is the second positive limit value,

- border enable modulation is the first positive edge value

the threshold modulation is the first negative edge value

- border reduce the number of always-on cells is the second negative limit value.

When controlling the formation of a pulse of negative polarity is performed the following sequence of actions:

- Converts the current value of the voltage at the current sensor into a digital value.

- Is the normalization of the converted value of the voltage at the current sensor.

- Calculates the deviation of the normalized values of the voltage at the sensor current from the current value of the exemplary form of a current pulse.

The deviation is compared with four fixed values: border of increasing the number of always-on cells, the boundary of the inclusion of modulation, threshold modulation, border, reducing the number of always-on cells.

- If the deviation is between the boundaries on and off the modulation, the number of active cells remains unchanged, and the state modulating cell is not changed.

- If the deviation is above the border of the inclusion modulation, modulating cell is activated, and the number of always-on cells OST which is unchanged.

- If the deviation is above the border of the increasing number of always-on power cells, the number of always-on cells is increased by 1, or is equal to the total number of power cells minus 1, and the condition of modulating cell is not changed.

- If the deviation is below the boundary off modulation, as in the previous cycle DSPS it was above the border off modulation, modulating cell is turned off, the number of always-on cells remains unchanged, and change the function performed by the cell.

- If the deviation is below the limit to reduce the number of always-on power cells, the number of always-on power cells is reduced to 1 or is equal to 0, and the condition of modulating cell is not changed.

In the present method of forming bipolar and multiphase pulse power cells contain only controlled electronic keys, and the signals enable and disable these keys are formed in DSPS. This provides a reduction in the number of circuit elements and increase its immunity. The inventive method minimizes the number of switching of power switches in cells in the process of forming pulse, pulse shaping without a pause between the different phases.

Figure 1 presents a device that uses str is about the formation of bipolar and multiphase pulses, where:

1, a digital signal processor (DSP);

2 and 3 the power cell;

4 - coil inductance;

5, 6 - conclusions of the device forming bipolar and multiphase pulses;

7 - load;

8 - current sensor.

Figure 2 presents the timing diagram of a current pulse, its exemplary form, and control signals supplied to the power cell, where:

9 is the ideal form of the current pulse,

10 - the actual shape of the current pulse,

11 - signal connection of the drive electric power to the leads of the power cell No. 1,

12 - signal connection of the drive electric power to the leads of the power cell No. 2,

13 is a signal connection of the drive electric power to the leads of the power cell No. 3,

14 is a signal connection of the drive electric power to the leads of the power cell No. 4,

15 - enable signal, positive polarity

16 - enable signal of negative polarity.

Figure 3 presents the timing diagram of variance normalized values of the signal from the current sensor from the exemplary form of a current pulse, the values of cell functions and state management functions of cells, where:

17 - deviation of the normalized values of the signal from the current sensor from the exemplary form of a current pulse,

18 - second positive limit value,

19 - the first positive edge value

20 - the first negative edge value

21 - second negative limit value,

22 - the value of the function of modulating the cell

23 - the value of the function is the first always-on cells

24 - the value of the second always-on cells

25 - the value of the third always-on cells

the 26 - state control cell functions.

4 shows timing diagrams of the current pulse and the voltage of the drive electric power of the power cells, where:

27 - drive voltage of the electrical energy power cell No. 1,

28 - drive voltage of the electrical energy power cell No. 2,

29 - drive voltage of the electrical energy power cell No. 3,

30 - drive voltage of the electrical energy power cell No. 4.

When the present method of forming bipolar and multi-phase pulse-controlled series-connected two or more identical power cells forming pulse of positive and negative polarity 2, 3, connected in series with the current sensor 8 and the inductor 4. Load 7 is connected to terminals 5, 6. The signal from the current sensor 8 is applied to the analog input of the DSP 1, digital output which controls the cells 2 and 3 (switching is good negative polarity, switching the drive electric power to the conclusions of the cell).

The implementation of the method of forming bipolar and multiphase pulses is illustrated in the example with four power cells forming pulse of positive and negative polarity, numbered from 1 to 4. The energy storage in cells of the original charged to a voltage of 900 V and have the capacity 220 µf, that provides the use of power electronic controlled switches for mass application. The inductor has an inductance of 10 mH, the load resistance is 50 Ohms, the current amplitude of the first phase of the pulse is set equal to 43 A. the Digital value of the amplitude of the first phase of an exemplary form of the current pulse, is stored in the DSP, has a value of 1. The duration of the execution cycle of the sequence control in the DSP set to 5 μs, the time from start of conversion signal from the current sensor to the change control signals of the power cell is 2 μs. Four boundary values used for control, defined as follows:

the second positive edge value is 0,035;

- the first positive edge value is 0,015;

the first negative edge value is -0,015;

the second negative edge value is -0,035.

The function of each cell is determined by the state administered the I functions in accordance with the table below.

The function of the cellThe number of cells that carry out the function, depending on the room status control cell functions
1234
Modulating cell1432
The first always-on cell2143
The second has constantly enabled cell3214
The third has constantly enabled cell4321

Figure 2 presents the timing diagram of current generated pulse, its perfect form and control signals supplied to the power cell. As a 19 positive and negative 20 the connection polarity of the electric drive is power to the leads of the power cell is enabled only when the current value contained in DSPS exemplary form of the current pulse of the turn-on threshold modulating cell. This allows easy switching pulse shapes downloading another exemplary pulse shape in DSPS. As seen on signals connect the drive electric power to the leads of the power cell 15...18, the described method provides a relatively uniform distribution of the number of switches between all of the power cells. When forming the first phase of the pulse with a positive polarity in this example, the power cell # 1 performs 6, the power cell No. 2 - 7, power cell No. 3 - 6 and the power cell No. 4 - 8 inclusions/off. During the formation of the second phase of the pulse with a negative polarity (not shown in full), power cell # 1 performs 7, the power cell No. 2 - 6, power cell No. 3 - 6 and the power cell No. 4 - 7 inclusions/off. It should also be noted that, as a rule, the formation of phases of different polarity pulse are different switching elements.

3 shows timing diagrams of the digital values of the deviations of the normalized values of the signal from the current sensor from the exemplary form of a current pulse, the values of cell functions and States of the control functions of the cells. The continued rise deviations after crossing the boundary values due to the synchronization of the start of conversion signal from the sensor input DSPS and delay changes signal the control cells at the time of execution of the STC sequence of control actions. To the timing charts 24...26 shows how an increasing number of always-on cells with increasing current pulse, and decreases with the decrease in the current.

4 shows timing diagrams of the current pulse and the voltage of the drive electric power of the power cells. The initial voltage on the storage of electrical energy is the same and is 900 C. After the formation of the pulse voltage on the energy storage unit power cell No. 1 is 390, the drive electric power of the cell # 2 is 400 V, the energy storage unit power cell No. 3 - 430, on the energy storage unit power cell No. 4 - 440 C. Thus, in this example, the average final voltage drives the electric energy of the power cell is 415, and the dispersion of the values of the final voltage is ±6%.

The method of forming bipolar and multiphase pulses used in defibrillators, developed in the framework of development work on theme "development of technologies for the generation of electric pulses, effectively stopping fibrillation, and prototype production of intelligent external defibrillators new generation for resuscitation and life support systems of man", performed by order of the open joint-stock companies, the TBA Zelenograd innovation and technology center". The method of forming bipolar and multiphase pulses tested on multiple layouts.

The sources of information.

1. U.S. patent 7,170,767, IPC: NM 7/00, published 30.01.2007.

2. U.S. patent 6,546,287, IPC: A61N 1/36, published 08.04.2003 prototype.

The method of forming bipolar and multiphase pulses, including the management of multiple series-connected single-type power cells containing storages of electric energy, characterized in that each of the power cells is controlled by switching the positive and negative polarity connection of the drive energy to the conclusions of the cell and the switching of the drive electric power to the conclusions of the cell, and the feedback signal is removed from the current sensor, connected in series to the power cells, and is applied to the analog input of a digital signal processor, are used to control the four boundary values that are in the following ratio: the second positive edge value is greater than the first positive edge value greater than zero the second negative edge value is less than the first negative boundary values, which is less than zero, the control is performed by a cyclic sequence of control actions in the digital signal processor to completion is formirovaniya pulse, the original number is constantly enabled and the power cell is set equal to zero, modulating cell is turned off, the positive and negative polarity of the power cell is disabled, and the inclusion of positive polarity of the power cell is performed when the current value of the exemplary envelope power exceeds the first positive limit value when the current value of an exemplary envelope voltage becomes lower than the first positive boundary values, the positive polarity of the power cell is disabled, positive polarity boundary of reducing the number of always-on cells is the second positive limit value, the threshold modulation is the first positive boundary value, the boundary of the inclusion modulation is the first negative boundary value, the boundary increase the number of always-on cells is the second negative limit value, control of the formation of a pulse of positive polarity is performed by converting the current value of the voltage at the current sensor into a digital value, the normalization of the converted value of the voltage at the current sensor, calculating the deviation of the normalized values of the voltage at the sensor current from the current value of the exemplary form of a current pulse which, the deviation is compared with four fixed values: border reduce the number of always-on cells, a threshold modulation, the boundary of the inclusion of the modulation boundary increasing the number of always-on cells, if the deviation is between the boundaries disable and enable modulation, the number of always-on cells remains unchanged, and the state modulating cell does not change, if the deviation is below the lower limit enable modulation, modulating cell is activated, and the number of always-on cells remains unchanged, if the deviation is below the lower limit of increasing the number of always-on power cells, the number of always-on cells is increased by one, or remains equal to the total number the power cells minus one, and the condition of modulating cell does not change, if the deviation is higher than the boundary off modulation, as in the previous cycle of the digital signal processor it was below the boundary off modulation, modulating cell is turned off, the number of always-on cells remains unchanged, and change the function performed by the cell, if the deviation is above the boundaries of reducing the number of always-on power cells, the number of always-on cells is reduced by one or remains shall I equal to zero, and the state modulating cell is not changed, and the inclusion of negative polarity in the power cell is performed when the current value of the exemplary envelope of the current pulse is lower than the first negative boundary values when the current value of an exemplary envelope of the current pulse exceeds the first negative edge value, the negative polarity of the power cell is turned off, while the border of increasing the number of always-on cells is the second positive boundary value, the boundary of the inclusion modulation is the first positive limit value, the threshold modulation is the first negative boundary value, the boundary reduce the number of always-on cells is the second negative limit value, the control pulse shaping of a negative polarity is carried out by converting the current value of the voltage at the current sensor into a digital value, the normalization of the converted value of the voltage at the current sensor, calculating the deviation of the normalized values of the voltage at the sensor current from the current value of the exemplary form of a current pulse by comparing the deviations with four fixed values: border of increasing the number of always-on cells, border included the Oia modulation, the threshold modulation, border, reducing the number of always-on cells, and if the deviation is between the boundaries on and off the modulation, the number of active cells remains unchanged, and the state modulating cell does not change, if the deviation is above the border of the inclusion modulation, modulating cell is activated, and the number of always-on cells remains unchanged, if the deviation is above the border of the increasing number of always-on power cells, the number of always-on cells is increased by one, or remains equal to the total number of power cells minus one, and the condition of modulating cell does not change, if the deviation is below the boundary off modulation, and in the previous cycle of the digital signal processor, it was beyond the boundary off modulation, modulating cell is turned off, the number of always-on cells remains unchanged, and change the function performed by the cell, if the deviation is below the limit to reduce the number of always-on power cells, the number of always-on power cells is reduced by one, or remains at zero, and the condition of modulating cell is not changed.



 

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The invention relates to medical equipment, namely, devices for generating stimulus signals

Defibrillator // 2196616
The invention relates to medicine and can be used in devices for intensive care and electro-therapy, in particular in defibrillators

The invention relates to medicine, namely to the portable electronic physiological instrument, in particular to a portable defibrillator with the common port of therapy data

Defibrillator // 2153901
The invention relates to medicine and can be used in devices for intensive care and electro-therapy, in particular in defibrillators

FIELD: medicine.

SUBSTANCE: method involves creating therapeutic circuit fixed on patient body, at least two working therapeutic electrodes, measuring and analyzing patient-dependent electrophysical parameters, charging capacitive storage and its later discharging to the working therapeutic electrodes controlled with control unit. Transmitting defibrillation impulse of given power in discharging is carried out in dosed manner first with the first portion W1 of given power dose with the second portion W2 being accumulated on inductive defibrillation power accumulator and then with the second portion W2 of given power dose. Ratio of the first portion W1 of given power dose to the second portion W2 of given power dose of defibrillation impulse is selected from the range of 0.01 to 150. Defibrillation impulse current intensity is selected only when emitting the first portion W1 of given power dose. Cardiodefibrillation impulse is built as bipolar Gurvich impulse. The given power quantity usable for charging the capacitive defibrillator storage is selected to be equal to a value from the range of 4-500 J, defibrillation impulse current intensity being selected from the range of 0.005 to 175 A and voltage equal to a value from 3 to 30000 V. Means has power supply source having unit for controlling charge level of the capacitive storage, unit for building defibrillation pulses, switchboards formed by controlled keys, at least two working therapeutic electrodes and diodes bypassing the controlled keys, resistive current transducer, analog-to-digital converter and control unit having required functional communications to the analog-to-digital converter and controlled keys. The resistive current transducer is in current feeding bus having minimum potential relative to measuring unit under operation having analog-to-digital converter in its structure.

EFFECT: enhanced effectiveness of usage; high safety of patient treatment procedure.

7 cl, 9 dwg

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