SU33037A1 - AC static frequency multiplier - Google Patents

Description

For frequency multiplication in a static way, resonant circuits are usually used, especially in radio engineering, in which the value of self-induction depends on the strength of the current. This is achieved by using an iron core with a suitable magnetization curve. Such a device has a number of drawbacks, for example, iron loss. According to the invention, in a similar frequency multiplier, instead of variable self-induction, a capacitor having a variable capacitance / dependent on the voltage at the terminals of this capacitor is used to distort the AC curve or voltage.

In FIG. 1.-b schematically depict various forms of the multiplier.

If the capacitance is a function of the voltage at the terminals of the capacitor, then if there is a sinusoidal voltage (frequency) applied to the circuit terminals, for the current we will get a non-sinusoidal curve from which harmonics can be extracted.

For example, in the case of the circuit of FIG. where the reactive coil 7, having

(504)

self-induction coefficient LI, connected in series with a variable capacitor 2 (and the capacitance value (sun), where the all-voltage at the terminals of the capacitor 2, you can write:

eu idt (1)

if the voltage across the terminals is close to sinusoidal, which can be achieved by selecting the value of the self-induction coefficient Z, i and switching on the capacitor 4 (Fig. 2), having a constant capacitance Co, then the current passing through the capacitor 2 is not sinusoidal . So, in principle, for capacitance C, for example, the dependence on the voltage of the form:

(2)

by the formula (Y) will have:

., L. (3)

Co-b with J

From where

e (. -EoSin cut,

we get: g, L coso) (. - afoSincoO

city, colds2 - 5ш2со) (4)

It can be seen from the equation that the current flowing through the capacitor will contain the second and other higher harmonics that can be used for these or other purposes.

As a capacitor having a variable capacitance, a capacitor with a dielectric can be taken from a single crystal, e.g., Rochelle salt, which gives the capacitance depending on the voltage at the capacitor terminals.

However, in addition to the circuit shown in FIG. 1 and 2, the contour shown in FIG. 3. In this case, in the presence of a sinusoidal current passing through the variable capacitor 2, with a frequency w, at its terminals, in addition to voltage with the frequency hell, ti harmonics with frequencies pn are also obtained, just as in similar variable capacity circuits. In addition, schemes are possible in which reactive coils having a variable self-induction coefficient are included independent of the presence of a resonant or non-resonant variable capacitor circuit, which makes it possible to better distinguish one or another harmonic. An example of such a circuit can serve as a circuit shown in the -fig. 4-6, where 2 is variable capacitance, / is variable self-induction, depending on the current passing through the reactive coil ((i)} and 3-reactive coil with a constant self-induction coefficient.

The subject of the patent.

Claims (4)

1. Static alternating current frequency or voltage multiplier, characterized in that a capacitor is used to distort the current or voltage curve and has a variable capacitance depending on the voltage at the capacitor terminals. 2. A static multiplier according to claim 1, characterized in that for distortion of the current or voltage in the multiplier circuit, this circuit is simultaneously switched on as a variable self-induction, the coefficient of which depends on the current, and a capacitor whose capacity depends on the voltage clamps of this capacitor. 3. The use of AC frequency in a static multiplier according to p. 1 and 2 as a capacitor with a variable capacitance, depending on the voltage at the terminals of this capacitor, a capacitor whose dielectric consists of a single crystal 4. Application to the multiplier according to claim 3 of the capacitor, the dielectric of which consists of Rochelle salt. E to the patent of the State All-Union Electrotechnical Association .. ВЭО К 33037 FIG. I FIG. 2