SU921061A1 - Controllable linear-varying voltage - Google Patents

Description

(5) CONTROLLED GENERATOR OF LINEAR VARIABLE VOLTAGE

I

The invention relates to a pulse technique and can be used, for example, in control nodes of thyristor converters.

A sawtooth voltage generator containing a discharge element MeHt at a field-effect transistor, a capacitor, a current-stabilizing element, a differential amplifier, and a differential current amplifier P1 is known. A disadvantage of the device is the impossibility of forming a step voltage.

The closest technical solution to the present invention is a linearly varying voltage controlled oscillator, comprising a field-effect transistor, the source of which is through the first resistor, and a gate through a capacitor connected to the positive power supply bus j the drain of the field-effect transistor is connected to the negative power supply bus, , bit element, second resistor,

and the linearly varying voltage is removed from the resistor n & load relative to the common bus of device C21.

The disadvantage of the device is the inability to adjust the angle to the clone of the linearly varying voltage, to obtain a linearly step voltage according to the control signals.

The purpose of the invention is to expand the functionality of the device.

The goal is achieved by the fact that: in a controlled oscillator a linear-varying voltage containing a field-effect transistor, the source

Claims (2)

15 which through the first resistor and the gate through a capacitor are connected to the positive power supply bus, the drain of the field-effect transistor is connected to the negative bus of the power supply source, the discharge element, the second resistor, the first and second transistors, the first and second diodes, a controlled current generator are introduced The input of which is connected to the negative power supply bus, the control input to the first control signal bus, the output directly to the emitter of the first transistor whose collector is connected to the positive bus and The power supply source, the bases with the second bus of control signals, and through the first diode - to the emitter of the second transistor, whose base is through the second resistor is connected to the source of the field-effect transistor, the collector is directly connected to the gate, and through the second to the source of the field-effect transistor and the discharge element Under the keys parallel to the first resistor. The schematic diagram of the device is shown in the drawing. The device contains a field-effect transistor I, the first resistor 2, the capacitor 3 of the bus t and 5 of the power source, bit 6, the second resistor 7, the first 8 and second 9 transistors, the first CG and the second 11 diodes controlled generator 12 current , bus 13 and f control signals. The device works as follows. When voltage is applied to the device, the open element 6 and the switching signal on the bus 13t exceeding the maximum value of the output voltage, the generator current 12, determined by the control signal on the bus And, flows through the open transistor 9i while the transistor 8 is closed, the diode 10 is biased 8 opposite direction, diode 11 zak | pc and capacitor 3 is not charged, the voltage at the output of the device is absent. When a switching signal equal to the potential of the common bus is applied to bus 13, the transistor 9 closes, the current is generated torus 12 flows through diode 10, transistor 8, diode 11 and resistor 2. The capacitor 3 is charged, the voltage at the output of the source follower on the field-effect transistor 1 increases linearly with the slope determined by the bus control signal k. When the control signal changes, the slope of the linear-varying voltage changes. If a switching signal is applied to bus 13. The generator current 12 is dissipated through transistor 9 and the output voltage of the device remains unchanged. With the closure of the discharge element 6 at the moment of time, the capacitor 3 is discharged from a small time constant and the voltage at the output of the circuit quickly drops to zero. Claims of the invention A linearly varying voltage controlled generator containing a field-effect transistor, the source of which is through the first resistor, and a gate through a capacitor connected to the positive power supply bus, the drain of the field-effect transistor connected to the negative power supply bus, the bit element, the second resistor, differing from that, in order to extend the functionality, the first and second transistors are introduced into it. The first and second diodes controlled by a current generator, whose input is connected to the negative power supply bus, the control input to the first control signal bus, the output directly to the emitter of the first transistor whose collector is connected to the positive power supply busbar, the base the second bus control signals, and through the first diode -. to the emitter of the second transistor, whose base through the second resistor is connected to the source of the field-effect transistor, the collector directly to the gate and through the second diode to the source of the field-effect transistor, and the discharge element is connected in parallel to the first resistor. Sources of information taken into account in the examination 1. The author's certificate of the USSR 58655, cl. H 03 K V08, 12.29.752. Electron Engenier {Gr. Brit.) 1973, 5, (f. P. BA.