SU721894A1 - Pulse generator - Google Patents

Description

one

The invention relates to pulsed technique, and can be used in implantable cardiac pacemakers.

A pulse generator is known that contains a discharge device, the first input of which is connected to the signal source terminal, and the second to the first output of a threshold device, to the input of a duration setting circuit and to the output of a hysteresis circuit, the output of which is connected to the output of a discharge device connected to the output the timing circuit, with the output of the reference circuit; safety is connected to the first input of the threshold device, the second output of which is connected to the output terminal. However, this pulse generator is not economical and reliable.

The aim of the invention is to increase the efficiency and reliability of the pulse generator.

For this, in the pulse generator, the output of the discharge device is connected to the second input of the threshold device.

The threshold device performs 1o on two transistors of different conductivity types, the collector of the first transistor connected to the base of the second transistor and through a resistor to the power supply bus connected to the emitter of the second transistor, the collector of which is connected via two series-connected resistors to another power supply bus connected through another resistor with the emitter of the first transistor, the base of which is connected via a diode to the second input terminal and directly to the first, the input terminal of the threshold stroystva.

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The drawing shows a diagram of the generator.

The pulse generator contains a discharge device 1, a timing circuit 2, a hysteresis circuit 3, a circuit 4 setting a duration, a threshold device 5, which contains a diode 6, transistors 7 and 8 npn and pnpr types, respectively. Moreover, the collector of transistor 7 is connected

to the base of the transistor 8 n through compistor 9 to the spike of the power source connected to the emitter of transistor 8, the collector of which through connected resistors lOjll is connected to the busbar connected through resistor 12 to the emitter of the transistor 7. The input terminals 13 and 14 of the device 5 are connected to the cathode and the anode of diode 6, and the cathode of diode b is connected to the base of transistor 7, and

the output terminals 15 and 16 of the device 5 are connected to the collector of the transistor 8 and the connection point of resistors 1O, 11, which is the output of the generator, while the terminal 15 is connected to one output of the device, 1, the other input of which is the output of the generator. The output of the device 1 is connected to the networks of 2,3 and terminal 14, the terminal 13 is connected to the output of the circuit 14, the input of which is connected to the input of the circuit 3 and terminal 15,

The generator works as follows.

If the first input of the device 1 receives prohibitive pulses from

a period shorter than the repetition period T0 of the pulses at the output of circuit 2, then the output pulses at terminal 16 are absent and the electrical power is practically not consumed by the generator.

If the inhibit signal is not received during the Tg interval, the transistor 7 opens slightly, which leads to the opening of the transistor 8 and due to the positive feedback through circuit 4 to an avalanche-like saturation process of the transistors 7.8. The positive potential at the collector of transistor 8 leads to switching on the device 1 and discharging the capacitor

The charging circuit 2, as well as to the charge of the storage capacitor of the hysteresis circuit 3. The pulse duration, i.e. the time during which the transistors 7.8 are kept on, is determined by the charging current of the capacitor 4.

Therefore, in the absence of prohibiting signals, the pulse generator

after a time interval T, the last banned sigall goes into impulse generation mode - with owing to the following period T Tf Td and the electrical power consumed by it in this mode of operation is determined mainly by the charge current of the capacitors and the emitter current of the transistor 8 occurring during the action of the transient pulse.

Claims (1)

1. A pulse generator containing a discharge device, the first input of which is connected to the signal source, and the second input - to the first input of the threshold device, to the input of the duration setting circuit5 and the input of the hysteresis circuit, the output of which is connected to the output of the discharge device connected to the output of the timing circuit, wherein the output of the duration setting circuit is connected to the first output of the threshold device, the second output of which is connected to the output terminal, characterized in that, in order to increase the efficiency and reliability, the generator pulses torus output discharge device coupled to a second input of the threshold device. 2, The generator according to claim 1, wherein the threshold device is made on two transistors of different conductivity type, the collector of the first transistor connected to the base of the second transistor and through a resistor to the power supply bus connected with the emitter of the second transistor, the collector of which is connected via two series-connected resistors to another power supply bus connected through another resistor to the emitter of the first transistor, whose base is connected via a diode to the second input terminal and directly to the first terminal of the threshold device.