CS239635B1 - Connexion for converter from voltage to interval - Google Patents

Abstract

Connection of voltage to time converter interval, intended for the measurement of pacemakers pulses. The converter consists of an integrator, ground input signal switch and comparator, where oscillations are provided i for input voltage close to zero.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voltage-interval converter for use in measuring cardiac pacing pulses. It is used mainly in technical and clinical workplaces where knowledge of pulses amplitude from pacemakers is required. It is therefore a workplace for the production of pacemakers and research and development workplaces for cardiovascular diseases.

Measuring the amplitude of the pacemaker pulses (in addition to measuring pulse width and pulse interval) provides important information about the quality of the pacemaker. The peak voltmeter ensures that the peak value of the pulse is captured. A voltage-interval converter has been used for digital measurement, which advantageously utilizes an (already installed) interval meter between pacing pulses.

The known voltage-interval transducer designs exhibit instabilities in the field of very low voltage measurements. This is because the low voltage corresponds to short intervals representing high frequency.

SUMMARY OF THE INVENTION The first resistor is connected to the input, the second terminal of which is connected to the controlled earth switch and the first comparator input, the comparator output being connected to the controlled earth switch control electrode and the integrator input, while the integrator output is connected via a second resistor to the second comparator input, wherein a third resistor is connected in series with the capacitor between the comparator output and its second input.

A new effect of connecting the voltage-to-interval converter is to provide defined properties in the low input voltage range in that, for a certain defined input voltage close to zero, the converter passes into its own oscillations that are not controlled by the input voltage.

The main advantage of the voltage-interval converter of the present invention is stability in the low input voltage range providing a defined measurement error.

The attached drawing shows an example of an embodiment of a voltage-interval converter according to the invention.

Input 2 is connected via first resistor 2 to the first input of comparator i and simultaneously to controlled ground switch 2 · ^{from the} output Ei of comparator 4 is controlled controlled earth switch 2 · Next to output 5 is connected input of integrator 6 whose output is via second resistor] fed to the second input of comparator 11. To this second input of comparator 2 is via a third resistor j1. and the capacitor 2 is connected to the output. This wiring ensures the converter oscillations even for the input 2 voltage close to zero.

Wiring function for positive voltage at input 1 through first resistor 2 to first input of comparator 4: voltage at second input of comparator 4 increases linearly. The output of the integrator 16 is via the second resistor 7. When the voltage at the second input of the comparator 4 exceeds! voltage on the first input, the polarity of the output S changes, the controlled ground switch 2 switches ^{and the} voltage on the second input of the comparator i decreases linearly. When the voltage at the second input of comparator 1 drops below the voltage at the first input, the polarity of the output 5 changes again and the whole process repeats from the beginning. The result is pulses at output 5 whose width (time interval) is proportional to the voltage at input 3. ·

The zero-voltage wiring function at input lj compares j4 as an oscillator with a frequency determined by the third resistor 2 ^and capacitor 9.

The voltage-interval converter is designed for digital measurement of positive voltages in a set of time interval meters, especially at technical and clinical workplaces dealing with the measurement of amplitude of pulses from pacemakers.

Claims (1)

SUBJECT OF THE INVENTION Voltage-interval converter connection characterized in that a first resistor (2) is connected to the input (1), the second terminal of which is connected to the controlled earth switch (3) and to the first comparator input (4), the output (5) of the comparator (4). ) is connected to the control electrode of the controlled earth switch (3) and to the integrator input (6), while the integrator output (6) is connected via a second resistor (7) to the second comparator input (4), 4) and its second input is connected to a third resistor (8) in series with the capacitor (9).