Controlled pulse generator

 

(57) Abstract:

Usage: in the pulse technique in electronic devices with variable pulse frequency. The inventive controlled pulse generator includes four serially connected inverter 1oC4, the capacitor 5 connected between the output and second input of the first inverter, two series-connected resistors 6, 7, included between the output of the third and the input of the first inverter, a variable resistor 8 connected between the input of the fourth inverter and connected to each other by findings of two resistors, two light emitter 9, 10, one of which is connected by its output to the control circuit, and the other to the current source, the variable resistor 8 is used foetoprotein that allows without any switches in the circuit of the generator to change the border changes the frequency of the generated pulses. 1 Il.

The invention relates to a pulse technique and can be used in electronic devices with variable frequency pulses, in particular in systems for remote and automatic control, conversion of the light flux in the frequency of impulses in electromusical , a load resistor, photodetectors, optoelectronic shutters, the light emitters (LEDs). For operation of the generator in the generating mode, you must apply simultaneously two logical 1 signal at the two inputs. The period (frequency) generation permanent and is caused by the time delay optoelectronic gates and photodetectors. The time delays are constants for each of the named element and depend only on their electrophysical parameters. The control circuit generator is not galvanically connected with his electric circuits (ed.St. N 1241431, CL N 03 TO 3/42, B N 24, 1986).

The disadvantage of this generator is the inability to change the frequency of the generated pulses due to the absence of external timing elements. In addition, the time delays of optoelectronic gates and photodetectors small, so the generator can not generate pulses with a low repetition rate of the order of 10 to 100 Hz.

Known converters of the light flux in the pulse frequency based on multivibrators and blocking generators. Depending on the requirements of sensitivity and linearity of the generator can be used the important aspect with a sensitivity of 15 Hz/LK use photodiodes, and in the Converter with a higher sensitivity of 88 Hz/LK apply photoshoprecovery. All circuit variants generators photodetectors included in the circuit controlling the pulse frequency. Elements of timing chains are fixed and are tailored to each specific part of the frequency range (Budakov VP Relaxation generators pulse converters of non-electrical quantities. M: Energy, 1974, S. 107).

A disadvantage of the known converters of the light flux in the pulse frequency is the impossibility of moving from one area of the frequency range to another without replacing the resistors or capacitors timing chains. In addition, you cannot change the sensitivity of the transducer directly in the process of its functioning.

Known asymmetrical multivibrator used in musical instruments. Management of its frequency within the specified range is fotosoprotivleniya. The boundaries are fixed, and their selection is made by replacing a resistor or capacitor timing chain (Dotsenko, Y. A. Svetofor. Radio, No. 11, 1984, S. 49).

The disadvantage of this asymmetrical multivibrator in the course of its work. Closest to the proposed solution to the technical essence is a controlled pulse generator containing four series-connected inverter, a capacitor connected between the output and second input of the first inverter, two series-connected resistors, the output of one of which is connected to the output of the third inverter, the output of the second resistor is connected to the input of the first inverter, and connected between the findings of these resistors and the output of the fourth inverter is connected variable resistor or as a variable resistor, an electronic device, consisting of two counter included field-effect transistors with resistors in the output circuit, the gates of field-effect transistors connected to a source of control voltage, each field-effect transistor with its resistor shunted by a diode. The frequency control pulse generator is the result of changes in the resistance of the variable resistor or the internal resistance of the electronic device due to a change in the control voltage on the interconnected gates of field-effect transistors (see and.with. N 921053, MKI N 03 TO 3/28, BI, N 14, 1982).

The disadvantage of this generator is the bottom of the ICOM control voltage. Consequently, at a considerable distance variable resistor, such as remote control frequency of the body, from the rest of the circuit may deteriorate the stability of the generator. In addition, a wide control range of the switching frequency, complicating accurate adjustment of the frequency in a pre-selected frequency range.

The purpose of the invention the expansion of the scope of the generator by providing opportunities for the delineation of the range of variation of the frequency of the generated impulses.

The positive effect of application of the invention lies in the fact that it is possible, without any switches in its electric circuit to alter the boundaries of the frequency range. In addition, the communication line control circuit with a control object and change the boundaries of the frequency range does not require shielding and special measures for protection from interference and various types of interference.

This objective is achieved in that the controlled pulse generator containing four series-connected inverter, a capacitor connected between the output and second input of the first inverter, two series-connected resistor between the of ertor and the point of connection of the two resistors, we have introduced two light emitter, one of which is connected by its output to the control circuit and the current source, the variable resistor used foetoprotein.

The drawing shows a functional diagram of the controlled pulse generator. The invention was implemented using chip CLA-3, photoshoprecovery SF-5, incandescent MN-0,062. Managed the pulse generator contains four series-connected inverter 1 to 4, a capacitor 5 connected between the output and second input of the first inverter, two series-connected resistors 6 and 7, the output resistor 6 is connected to the output of the inverter 3, the output resistor 7 is connected to the input of the inverter 1, and connected between the terminals of the resistors 6 and 7 connected foetoprotein 8, the second terminal of which is connected to the output of the inverter 4. Foetoprotein 8 flashes two light emitters 9 and 10, one 9 is connected by its output to the control circuit frequency, and the other 10 connected to its own power source 11.

The operation of the controlled pulse generator is as follows. Under the action of overcharging of the capacitor 5 is the change of potential h is otherwise change States of the inverters 2, 3, 4 and overcharge of the capacitor 5, resulting in the generation mode. The frequency of oscillation is determined by the parameters of the circuit consisting of capacitor 5, resistors 6 and 7 and the resistance value of photoshoprecovery 8. Selecting the operating frequency range is carried out using a light emitter 10. Is this due to the fact that when additional illumination of photoshoprecovery 8 decreases its resistance and work area range is shifted to high frequencies. The decrease in the intensity of the emitter 10 entails the expansion of the range towards the low frequencies. The control pulse frequency in the selected range are produced by the emitter 9.

Managed the pulse generator containing four series-connected inverter, a capacitor connected between the output and second input of the first inverter, two series-connected resistors connected between the output of the third and the input of the first inverter, a variable resistor connected between the output of the fourth inverter and the connection point of the two resistors, wherein, with the aim of expanding the scope of the generator by providing the possibility of establishing limits of the range of var conclusions to the control circuit, and the other to the current source, the variable resistor used foetoprotein.

 

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