GB2129243A

GB2129243A - A circuit for providing a source of pulses for an electronic suppression of pain

Info

Publication number: GB2129243A
Application number: GB08228364A
Authority: GB
Inventors: Vladislav Kympl
Original assignee: Tesla Koncernovy Podnik
Current assignee: Tesla Koncernovy Podnik
Priority date: 1982-10-12
Filing date: 1982-10-05
Publication date: 1984-05-10
Also published as: FR2534141A1; GB2129243B; FR2534141B3; DE3240004A1

Abstract

A multivibrator with a rectangular wave output (at A-B) has doubled the amplitude of the feeding voltage (0- +U). The invention comprises a multivibrator with two pairs of complementary transistors. By switching the voltage (at B) at the base of the capacitors 4 and 5 when they are charged, voltage doubling is achieved so the output pulses have double the amplitude of the supply. The invention may be applied for battery instruments, where one needs voltage pulses, the amplitude of which is greater than the value of voltage of the feeding batteries, e.g. a portable embodiment of instruments for an electronic suppression of pains. <IMAGE>

Description

SPECIFICATION A circuit for providing a source of pulses for an electronic suppression of pain The invention relates to a source of pulses for electronic instruments designed for a suppression of pain.

There are known instruments, which provides oscillation of a frequency 10 Hz up to 2000 Hz, voltage round 30 V, the property of which resides in the fact that after output electrodes have been applied on the skin-at least one of the said electrodes has been situated in the respective active spot-there appear an analgetic effect, i.e.

phantom pains are either diminished or suppressed completely.

As to their design, a source of oscillation is mostly represented by a multivibrator of a feeding voltage 30 V and more, or with other additional circuits, transformer etc. This fact makes requirements for a supply source and dimensions of the instrument more complicated.

The said drawback may be obviated by a wiring of a multivibrator with a double amplitude of the output signal according to the invention, the principles of which resides in the fact that parallelly to input terminals there are connected both a serial combination of the first charging diode; of the first and second charging capacitor, of the second charging diode, and emitters of the first complementary couple of transistors, the collectors of which are connected to a common point B of the first and second charging capacitor, but bases of the first complementary couple of transistors are connected through exciting resistors to a common point A of collectors of the second complementary couple of transistors, the emitters of which are connected through diode gates and charging diodes, shunted by the first and second smoothing condenser, to the said input terminals, the bases of the second complementary couple of transistors are both interconnected by means of a charging resistor and connected through coupling condensers to the common point B of the collectors of the first complementary couple of the transistors and charging capacitors.

The wiring according to the invention is in fact a multivibrator with two couples of complementary transistors, one couple of which also works as a changeover switch and feeder of the voltage doublers, working in the rhythm of the multivibrator. If we do not take into consideration voltage drops in junctions, then the amplitude in the output of the multivibrator in common points A and B is four times greater than the feeding voltage of the source.

In order that the invention may be clearly understood and readily carried into effect, a preferred embodiment thereof is, by way of example, hereinafter more fully described and illustrated in the accompanying drawing, in which: Figure 1 shows a wiring diagram of the multivibrator according to the invention.

Parallelly to input terminals 1, 2 there are connected both a serial combination of the first charging diode 3, of the first charging capacitor 4, of the second charging capacitor 4, of the second charging capacitor 5, of the second charging diode 6, and the first complementary couple of transistors 10 and 1 the collectors of which are connected to a common point B of the first and second charging capacitor 4 and 5. Bases of the first complementary couple of transistors 10, 1 1 are connected through feeding resistors 13, 14 to a common point A of collectors of the second complementary couple of transistors 15, 16.

Emitters of the second complementary couple of the transistors 15, 16 are connected, through diode gates 7, 8 and charging diodes 3, 6, shunted by a first and second smoothing condenser 9, 12, to input terminals 1, 2. Bases of the second complementary couple of the transistors 15, 16 are mutually connected by means of a charging resistor 17, and by means of coupling condensers 18, 19 they are connected to a common point B of the first and second capacitor 4, 5 and of collectors of the first complementary couple of the transistors 10, 11.

After connecting the source of feeding voltage to terminals 1 and 2, one of the transistors 15 and 16 starts opening more quicker. Let us suppose that it is the transistor 15. So in the common point A of collectors of the transistors 1 5 and 16 a positive voltage of the source appears. Voltage drops in junctions of semiconductors may be neglected for making the case more simple.

Positive voltage in the common point A causes the closing of the transistor 10 and the opening of the transistor 11. In this way the common point B of collectors of the transistors 10 and 1 1 and of the charging capacitors 4 and 5 is connected to a zero terminal 2 of the feeding voltage, and the capacitor 4 is charged to the full voltage of the source through the charging diode 3.

As the coupling condensers 18 and 19 are also connected to the common point B, which is now connected to the zero terminal 2, the coupling condenser 18 will be charged by the transistors B-E of the transistor 1 5, and through the charging resistor 17 the coupling transistor 19 will be charged as well.

Positive voltage across the bases of the transistors 1 5 and 1 6 causes a change of their conductivity. The transistor 15 closes, the transistor 16 opens and in this way it connects the common point A of the collectors of the transistors 1 5 and 16 to the zero terminal of the feeding source. This fact causes the opening of the transistor 10 and the closing of the transistor 11. The common point B of the collectors of the transistors 10 and 1 1 and of the charging capacitors 4 and 5 has now the same potential as the positive terminal of the source 1. As the charging capacitor 4 was charged in advance, the voltage being between its positive outlet and the zero terminal 2 is coupled with respect to voltage of the source. The smoothing condenser 9 is fed with the said voltage through the diode gate 7.

Simultaneously the capacitor 5 is charged through the charging diode 6 and the coupling condenser 19 is discharged through the transition B-E of the transistor 1 6; through the resistor 17 there is discharged the coupling condenser 18.

The discharging of the coupling condensers 1 8 and 19 causes again a change of conductivity of the transistors. The transistors 15 and 1 1 open, the transistors 16 and 20 close. In the common point A the potential is identical with the potential of the positive outlet of the smoothing condenser 9, viz. it is higher than voltage of the feeding source.

The common point B is connected again to the zero terminal 2. The charging capacitor 4 is charged again through the diode 3 to the voltage of the source. The charging capacitor 5 is discharged through the diode gate 8 into the smoothing condenser 12. Simultaneously the coupling condenser 18 is charged through the transition B-E of the transistor 15 and the coupling condenser 19 through the charging resistor 17. The charging of these condensers causes again the change of conductivity of the transistors 15, 16 and the process repeats in the described way. The smoothing condensers 9, 12 are charged continuously up to the full voltage of the source.In the positive outlet of the smoothing condenser 9 voltage is doubled with respect to the zero terminal, and in the negative outlet of the smoothing condenser 12 there is the same voltage, but of an opposite orientation, than the voltage of the feeding source. Across the mentioned outlets the voltage is tripled with respect to the feeding voltage.

Between the common points A and B rectangular voltage pulses arise. If one marks the feeding voltage U and if one neglects the voltage drops in transitions of semiconductors, then in case of conductivity of transistors 1 5 and 11 in the common point A, voltage +2U takes place, and in the common point B there is zero. In case of conductivity of the transistors 1 6 and 1 0 voltage takes place in the common point A, and voltage +U in the common point B.

The change of these pulses is determined by a time constant of the coupling condensers 1 8 and 19 and of the charging resistor 17.

The wiring may be carried out even with an opposite polarity of semiconductor elements, condensers and source of feeding voltage.

The invention may be applied for portable battery instruments, where on needs voltage pulses, the amplitude of which is a multiple of the feeding voltage of ordinary batteries, e.g. portable embodiments of instruments for an electric accupuncture.

Although the invention is illustrated and described with reference to one preferred embodiment thereof, it is to be expressly understood that it is in no way limited to the disclosure of such a preferred embodiment, but it is capable of numerous modifications within the scope of the appended claim.

Claims

1. A circuit for providing a source of pulses for an electronic suppression of pain and for tracing active spots on the skin, comprising that parallelly to input terminals there are connected both a serial combination of the first charging diode, of the first and second charging capacitor, of the second charging diode, and emitters of the first complementary couple of transistors, the collectors of which are connected to a common point B of the first and second charging capacitor, but bases of the first complementary couple of transistors are connected through exciting resistors to a common point A of collectors of the second complementary couple of transistors, the emitter of which are connected through diode gates and charging diodes, shunted by the first and second smoothing condenser, to the said input terminals, the bases of the second complementary couple of transistors are both inter-connected by means of a charging resistor and connected through coupling condensers to the common point B of the collectors of the first complementary couple of the transistors and charging capacitors.

2. A circuit for providing a source of pulses for an electronic suppression of pain and for tracing active spots on the skin substantially as described with reference to the accompanying drawing.