SU705656A1 - Sawtooth voltage generator - Google Patents

Description

(54) POWER VOLTAGE GENERATOR

one

The invention relates to a pulsed technology and can be used in forming devices.

A device containing 5 integrator, comparator, resistors,

key one .

The disadvantage of the device is its complexity.

The closest in technical terms to the proposed is a sawtooth generator, containing a power source to one of the buses of which are connected through the first resistor to the drain of the field-effect transistor and through the capacitor to the second resistor 2.

The disadvantage of this device is its low linearity.

The purpose of the invention is to increase the 20ness of the output voltage.

To do this, a sawtooth voltage generator containing a power source to one of the terminals of which is connected through the first resistor, drain 25 of the field-effect transistor and through a capacitor — the second resistor — will introduce an additional capacitor connected in parallel to the second resistor and the gate-source junction of the field transistor Q

a resistor whose gate is connected to another power supply bus.

The drawing shows a circuit diagram of the device.

The device contains a power source 1, the first resistor 2, the field-effect transistor 3, the capacitor 4, the second resistor 5, the additional capacitor 6 ,,

The device works as follows.

Claims (2)

In each half-cycle of the input voltage, when the zero-voltage curve passes, the charge of the capacitor 4 and the additional capacitor 6 begins. The voltage across the capacitor determines the potential of the gate of the FET 3 in relation to its source. At the same time, a current flows through the source-drain circuit of the field-effect transistor, which operates in the triode part of the output characteristic f (Linearization of the charging process is provided by the elements: resistor 5 and additional capacitor 6, as well as the feature that the circuit is powered from a sinusoidal voltage source. Duration the pulse travel can be measured: by the heel of the capacity of the additional capacitor 6. At the time when the charge of the storage capacitor 4 stops, the potential of the gate relative to the source ku is equal to 0. Therefore, the current flowing through the resistor 2 reaches the maximum value. This ensures fast recovery of the initial cxeNoj connection, when there are no charges in the capacitors 4 and 6. Low power consumption is ensured by the fact that the field effect transistor the function of the amplifying element and the synchronizer M makes it possible to refuse to form a differential measurement circuit. Formula of the invention A sawtooth generator containing a power source, to one  O - CHI V8K f o-w one. hf + dzi- The ib of the buses of which is connected through the first resistor to the drain of the field-effect transistor and through the capacitor is the second resistor, characterized in that, in order to increase the linearity of the output voltage, an additional capacitor is connected to it, connected in parallel to the second resistor and the gate-source junction of the field-effect transistor, the shutter which is connected to another power supply bus. Sources of information taken into account in the examination 1.Pr Nishnikov V.L. Integrating digital DC voltmeters, Energie, L., 1976, fig. 3.18. 2. Vazhenina-ZP and Pudrikov E.V. Transistor Pulse Generators Millisecond Range, Sov.ra Dio. M., 1974, p. 80, fig. 2.18 (prototype) ..